US20070093806A1 - Device and Method for Multi-Phase Radio-Frequency Ablation - Google Patents
Device and Method for Multi-Phase Radio-Frequency Ablation Download PDFInfo
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- US20070093806A1 US20070093806A1 US11/611,741 US61174106A US2007093806A1 US 20070093806 A1 US20070093806 A1 US 20070093806A1 US 61174106 A US61174106 A US 61174106A US 2007093806 A1 US2007093806 A1 US 2007093806A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
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- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
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- A61B18/14—Probes or electrodes therefor
- A61B18/1492—Probes or electrodes therefor having a flexible, catheter-like structure, e.g. for heart ablation
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- A61N1/40—Applying electric fields by inductive or capacitive coupling ; Applying radio-frequency signals
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Definitions
- This invention relates to medical devices and, in particular, a multi-electrode catheter and techniques therefor of employing multi-phase radia-frequency power source for ablation of endocardiac tissues.
- Cardiac dysrhythmias are commonly known as irregular heart beats or racing heart.
- Two such heart rhythm irregularities are the Wolff-Parkinson-White syndrome and atrioventricular (AV) nodal reentrant tachycardia.
- AV atrioventricular
- AV atrioventricular
- VT ventricular tachycardia
- VT ventricular tachycardia
- the regions to be ablated are usually determined by endocardiac mapping. It is a technique that typically involves percutaneously introducing an electrode catheter into the patient.
- the electrode catheter is passed through a blood vessel, like femoral vein or aorta and thence into an endocardiac site such as the atrium or ventricle of the heart.
- a tachycardia is induced and a continuous, simultaneous recording made with a multichannel recorder while the electrode catheter is moved to different endocardiac positions.
- a tachycardial focus is located as indicated in an electrocardiogram recording, it is marked by means of a fluoroscope image.
- ablation of cardiac arrhythmias is typically performed by means of a standard electrode catheter.
- the electrical energy shocks is used to create a lesion in the endocardiac tissues adjacent (i.e. underneath) the standard electrode catheter.
- the tachycardial focus may be turned into a region of necrotic tissue, thereby disabling any malfunctions.
- Conventional catheter ablation techniques have typically employed a catheter with a single electrode at its tip as one electrical pole.
- the other electrical pole is formed by a backplate in contact with a patient's external body part.
- These techniques have been used successfully for interruption or modification of conduction across the atrioventricular (AV) junction in AV nodal reentrant tachycardia; for interruption of accessory pathway, in patients with reentrant tachycardia due to Wolff-Parkinson-White Syndrome; and for ablation in some patients with ventricular tachycardia.
- AV atrioventricular
- high voltage direct current (DC) in the range of 100-300 joules is applied across the electrode and the backplate to effect ablation.
- Direct current energy source using the standard electrode catheter can produce a lesion size larger than the footprint of the electrode.
- the lesion dimensions are variable at the same energy output and they do not have clear demarcation from the surrounding tissues.
- high voltage techniques have other undesirable side-effects such as barotrauma and the lesions formed could become proarrhythmic.
- RF radio-frequency
- the RF source is typically in the 600 kHz region and produces a sinusoidal voltage between two wires. When this is delivered between the distal tip of a standard electrode catheter and a backplate, it produces a localized RF heating effect. It causes a well defined, discrete lesion slightly larger than the tip electrode. This simple RF ablation technique creates lesion size sufficient for interruption of AV junction or accessory pathway.
- RF ablation is preferable to DC ablation because it does not need anesthesia and produces more circumscribed and discrete lesions and avoids injury caused by high voltages as in DC shock.
- catheter ablations of AV junction using standard electrode catheter with DC or RF energy for treating drug resistant supraventricular tachycardia have high success rate with very low incidence of complications.
- ventricular tachycardia VT
- endocardiac mapping with a standard electrode catheter can locate the exit site of ventricular tachycardia to within 4-8 cm 2 of the earliest site recorded by the catheter.
- a standard electrode catheter typically has a maximum electrode tip area of about 0.3 mm2. Therefore, the lesion created by the simple RF technique delivered through a standard electrode catheter may not be large enough to ablate the ventricular tachycardia.
- Attempts to increase the size of lesion by regulation of power and duration by increasing the size of electrode or by regulating the temperature of tip electrode have met with partial success.
- OECA orthogonal electrode catheter array
- the four peripheral electrodes are actuable from a retracted or collapsed mode.
- the four peripheral electrodes and the central electrode form an electrode array that typically covers an area of about 0.8 cm 2 .
- the five connecting electrodes When used with a conventional RF power source in conjunction with a backplate, the five connecting electrodes will typically produce five lesion spots distributed over the area spanned by the electrode array.
- this arrangement has been found to be unsatisfactory as there are substantial areas between the electrodes that remain unablated. Increasing the power only results in charring of the tissues and early fouling of the electrodes by coagulum formation.
- each electrode is supplied with an RF source having a different phase. In this way, potential differences are created between each pair of electrodes in the array, thereby allowing current to flow between each pair of electrodes in the array to form a more uniform heating pattern therein.
- a simplified power connection configuration provides a phase difference between at least adjacent pairs of electrodes. In this way, potential differences are created between at least adjacent pairs of electrodes in the array, thereby allowing current to flow between each adjacent pair in the array to form a more uniform heating pattern therein.
- One important aspect of the present multi-phase RF scheme is that a conventional external contact backplate is not employed to connect to the ground terminal of the power supply to complete the circuit. Instead, one or more electrodes among the array are connected to the ground terminal of the multi-phase RF power supply. In this way, unlike the conventional schemes, the various RF currents do not flow perpendicular into the tissue between the electrodes and a backplate, but instead, flow parallel to the surface of the tissue between different pairs of electrodes. This arrangement allows various permutations of current paths to form on the tissue's surface, thereby adequately filling the ablation zone spanned by the array.
- a two-phase RF power source is used in conjunction with an orthogonal electrode catheter array to create a square-shape lesion of size approximately 1.2 cm 2 . Lesions of larger size can be formed by successive adjacent placements of the electrode array.
- the orthogonal electrode catheter array comprises a central electrode and four peripheral electrodes. The central electrode is connected to a ground voltage of the power supply. The four peripheral electrodes form two diagonal pairs which are respectively connected to two individually phased voltages of the power supply. By this arrangement RF current is made to flow between all adjacent pairs of electrodes to substantially fill the ablation zone spanned by the array.
- a temperature sensor is incorporated in at least one of the electrodes so as to monitor and maintain temperature of ablations at a predetermined level.
- multi-phase RF ablation is accomplished with the two- or three-dimensional array of electrodes in combination with an additional auxiliary electrode.
- the auxiliary electrode is a backplate electrode commonly used in electrical energy ablation. While the two- or three-dimensional array of electrodes is deployed within a subject's body and is in contact with an internal surface to be ablated, the backplate forms an external electrode in contact with the external surface of a subject's body. Thus, the backplate electrode and the two- or-three-dimensional array of electrodes together form a larger set of electrodes to which multi-phase power can be supplied.
- the resulting current paths tend to be lateral or parallel to the contacting surface.
- the resulting current paths tend to be longitudinal or perpendicular to the contacting surface.
- the present invention applies multi-phase power to the combination of the electrode array of the catheter and the backplate electrode to effect ablation.
- This has the advantage of combining the benefit the lateral spread resulted from the use of the electrode array with the depth resulted from the use of the backplate.
- power to the backplate and the array of electrodes is phased such that substantial currents flow both lateral and longitudinal to the internal surface under ablation. In this way, a greater volume of ablation zone with good lateral spread and depth is obtained. For example, using the orthogonal electrode catheter array, a lesion 10 mm by 10 mm by 12 mm deep is obtained.
- ablation is performed with a sequence of elementary electrode-electrical configurations.
- These configurations include single-phase RF between the catheter electrodes and the backplate, multi-phase RF between the catheter electrodes.
- ablation in the longitudinal and lateral directions, to which these configurations are respectively associated with, can be optimized more or less independently.
- FIG. 1 a illustrates the conventional technique of single-phase radio-frequency ablation employing a standard electrode catheter
- FIG. 1 b illustrates in more detail the ablation region shown in FIG. 1 a;
- FIG. 1 c illustrates schematically the electrode configuration of a multi-electrode catheter with the conventional RF power supply arrangement of FIG. 1 a;
- FIG. 1 d illustrates the lesions formed by the multi-electrode array of FIG. 1 c with conventional perpendicular ablation currents
- FIG. 2 a illustrates schematically a multi-electrode catheter suitable for multi-phase RF ablation
- FIG. 2 b illustrates schematically the electrical connections of the multi-electrode catheter in FIG. 2 a with a multi-phase power supply, according to the present invention
- FIG. 3 a shows one embodiment of the multi-phase radio-frequency power supply in FIG. 2 b;
- FIG. 3 b is a schematic block diagram of the phase shifting circuit in FIG. 3 a;
- FIG. 4 shows another embodiment of the multi-phase RF power supply in FIG. 2 b;
- FIG. 5 a is a top plan view of the seven-electrode configuration of FIG. 2 b , as powered by a multi-phase supply;
- FIG. 5 b illustrates the current distribution in a subset of adjacent electrodes of the multi-electrode array shown in FIG. 5 a;
- FIG. 5 c illustrates the sinuosodial voltages V 10 , V 20 as a function of time
- FIG. 6 a illustrates the current distributions of a seven-electrode configuration as powered by a multi-phase supply
- FIG. 6 b illustrates the current distributions of a seven-electrode configuration as powered by a single-phase radio-frequency power supply
- FIG. 6 c also shows the current distributions for a variation of the seven-electrode configuration as powered by a single-phase radio-frequency power supply
- FIG. 7 a illustrates the five-electrode orthogonal electrode catheter array (OECA) in its fanned-out state
- FIG. 7 b shows the footprints of the five-electrode OECA
- FIG. 8 a illustrates the five-electrode OECA being used as a two-phase ablation apparatus according to a preferred embodiment
- FIG. 8 b illustrates the current distributions resulted from the two-phase configuration of FIG. 8 a
- FIG. 9 a illustrates the five-electrode OECA being connected in a single-phase configuration for the purpose of comparison with the two-phase configuration of FIG. 8 a;
- FIG. 9 b illustrates the current distributions resulted from the single-phase configuration of FIG. 9 a
- FIG. 10 shows a graph of lesions size versus ablation energy for various example operating parameters for both the two-phase and single-phase RF applications of the five-electrode OECA;
- FIG. 11 illustrates the formation of a still larger lesion by successive adjacent ablations
- FIG. 12 shows a multi-phase RF ablation system having electrode tip temperature control
- FIG. 13 illustrates schematically the multi-electrode catheter of FIG. 2 a in combination with an auxiliary electrode connected to a multi-phase power supply, according to another aspect-of the present invention
- FIG. 14 a illustrates the five-electrode OECA in combination with a backplate electrode being configured as a three-phase ablation apparatus according to a preferred embodiment
- FIG. 14 b illustrates the five-electrode OECA in combination with a backplate electrode being configured as a two-phase ablation apparatus according to a preferred embodiment.
- FIG. 1 a illustrates the conventional technique of single-phase radio-frequency (SPRF) ablation employing a standard electrode catheter 10 .
- An electrode 20 is located at the tip of the catheter and is electrically connected to a single-phase RF energy source or power supply 30 .
- the other end of the power supply 30 is connected to a backplate 40 .
- the electrode 20 is typically hemispheric in shape with a diameter of not more than 0.3 mm so as to allow easy insertion into a patient's body.
- the electrode 20 is placed adjacent a region to be ablated such as biological tissues 50 inside a heart (endomyocardium).
- a closed circuit is formed with the backplate 40 in contact with an external body part near the heart of the patient.
- RF current spreads perpendicularly from the electrode catheter 20 to the backplate 40 creating a lesion on the endomyocardium 50 .
- FIG. 1 b illustrates in more detail the ablation region shown in FIG. 1 a . Since the RF current density is highest at the electrode catheter 20 and decreases rapidly as it flows toward the backplate, the current density will be high enough to cause a lesion 60 in a relatively small region surrounding the electrode catheter.
- FIG. 1 c illustrates schematically the electrode configuration of such a multi-electrode catheter with the conventional RF power supply arrangement of FIG. 1 a . It comprises two crossed pairs of electrodes 63 , 65 with a fifth, central electrode 67 . The multiple electrodes, which are spread evenly over the endomyocardium 50 , are all connected to one terminal 71 of the power supply 30 , and a backplate 40 is connected to the other terminal 73 . RF currents flowing perpendicular to the surface of the endomyocardium 50 will be more spread out.
- FIG. 1 d illustrates the lesions formed by such an electrode array with perpendicular ablation currents.
- the ablation produces discrete lesions 81 , each localized about one of the electrodes.
- Substantial areas 83 in between the electrodes remain unablated.
- FIG. 2 a illustrates schematically one embodiment of a multi-electrode catheter 200 suitable for multi-phase ablation.
- the catheter 200 comprises a plurality of electrodes 201 and a centrally located electrode 203 .
- the electrodes are capable of being collapsed onto the catheter body when the catheter is being introduced into a patient's body. During ablation operation they are fanned out into a two-dimensional or three-dimensional array as shown.
- FIG. 2 b illustrates schematically the electrical connections of the multi-electrode catheter in FIG. 2 a with a multi-phase power supply.
- a two-dimensional array of seven electrodes 201 are shown.
- the array of electrodes is placed adjacent a piece of biological tissue 60 , such as a region of endomyocardium to effect ablation thereof.
- the electrodes 201 are preferably distributed evenly to form an ablation zone 211 .
- Each electrode 201 is connected to a voltage branch V 10 -V 60 of a multi-phase radio-frequency energy source or power supply 220 by means of an interconnecting wire 221 .
- the centrally located electrode 203 is connected to a ground voltage V 00 of the power supply 220 via an interconnecting wire 225 .
- the multi-phase RF power supply 220 preferably operates at an RF frequency of about 600 kHz.
- FIG. 3 a shows one embodiment of the multi-phase radio-frequency power supply in FIG. 2 b . It comprises a main single-phase power supply 231 , the output 233 of which is sent in parallel to a plurality of phase shifting circuits 241 .
- the output voltages V 10 -V 60 from these phase shifting circuits 241 have substantially the same amplitudes, but their phases are shifted relative to each other.
- each individual phased voltage such as V 10 is supplied via a line 221 to an electrode 201 connected thereto.
- the central electrode is connected via the interconnecting wire 225 to the ground voltage V 00 at a terminal 251 of the power supply 220 .
- FIG. 3 b is a schematic block diagram of the phase shifting circuit 241 in FIG. 3 a . It comprises two reactive components Z 1 , Z 2 . They can be an RC or RL pair. If Z L is the load impedance of the electrode, then the phase shift is given-by the angle of: Z 1 Z L /[Z 1 Z L +Z 2 (Z 1 +Z L )].
- FIG. 4 shows another embodiment of the multi-phase radio-frequency power supply 220 in FIG. 2 b . It comprises a plurality of individual RF power source 261 . Each individual RF power source 261 is capable of delivering a voltage such as one of V 10 -V 60 with independent amplitude and phase, one for each electrode 201 connected thereto. The central electrode 203 is connected to a ground voltage V 00 at the terminal 251 .
- One important aspect of the present multi-phase RF scheme is that an external contact backplate is not required to connect to the ground terminal of the power supply to complete the circuit. Instead, one or more electrodes among the array are connected to the ground terminal of the multi-phase RF power supply. In this way, unlike the conventional scheme shown in FIGS. 1 a and 1 b , the various RF currents do not flow perpendicular into the tissue between the electrodes and a backplate, but instead, flow parallel to the surface of the tissue between different pairs of electrodes. This arrangement allows various permutations of current paths to form on the tissue's surface, thereby adequately filling the ablation zone spanned by the array.
- FIG. 5 a is a top plan view of the seven-electrode configuration of FIG. 2 b , as powered by a multi-phase supply.
- the configuration comprises of a central electrode 203 or ( 0 ) uniformly surrounded by peripheral electrodes 201 or ( 1 )-( 6 ).
- the multi-phase RF power supply is not explicitly shown, it will be understood that the electrodes ( 0 )-( 6 ) are 5 respectively connected to the V 10 -V 60 voltage sources of the power supply 220 shown in FIG. 2 b.
- the central electrode ( 0 ) is adjacent to all six peripheral electrodes ( 1 )-( 6 ).
- a peripheral electrode such as the electrode ( 1 ) is adjacent to electrodes ( 0 ), ( 2 ) and ( 6 ).
- the rest of the electrodes ( 3 ), ( 4 ) and ( 5 ) are one electrode removed from the electrode ( 1 ).
- FIG. 5 b illustrates the current distribution in a subset of adjacent electrodes ( 0 ), ( 1 ), ( 2 ) of the multi-electrode array shown in FIG. 5 a .
- the electrodes ( 0 ), ( 1 ), ( 2 ) are respectively connected to the voltages V 00 , V 10 , V 20 shown in FIG. 2 b . Therefore, the potential difference developed across electrodes ( 1 ) and ( 0 ) is V 10 and it causes a current to flow along a path 310 between the electrodes ( 1 ) and ( 0 ).
- V 20 the potential difference developed across electrodes ( 2 ) and ( 0 ) is V 20 , and it causes a current to flow along a path 320 between the electrodes ( 2 ) and ( 0 ).
- a third current path 312 between the electrodes ( 1 ) and ( 2 ) is best understood by reference also to FIG. 5 c.
- FIG. 5 c illustrates the sinuosodial voltages V 10 , V 20 as a function of time.
- FIG. 6 a illustrates the current distributions of a seven-electrode configuration as powered by a multi-phase supply.- The phase difference between each adjacent pair of electrodes results in a potential difference and allows the currents to flow therebetween. Thus a current path 333 is formed between each pair of adjacent electrodes. This provides a fairly complete coverage of the ablation zone spanned by the electrode array.
- FIG. 6 b illustrates the current distributions of the seven-electrode configuration as powered by a single-phase radio-frequency power supply.
- a maximum number of current paths is achieved by connecting the central electrode ( 0 ) to the ground voltage V 00 of the single-phase power supply, and all the peripheral electrodes ( 1 )-( 6 ) to the voltages V 10 -V 60 respectively.
- the resulting current paths 333 distribution forms a series of spokes, each joining the central electrode ( 0 ) to one of the peripheral electrodes ( 1 )-( 6 ). This leaves substantial areas in between where no current flows and therefore those areas are not subjected to adequate RF heating. A lesion formed in this manner will be very uneven and ineffective.
- FIG. 6 c also shows the current distributions for a variation of the seven-electrode configuration as powered by a single-phase radio-frequency power supply.
- the electrodes ( 0 ), ( 2 ), ( 4 ), ( 6 ) are connected to the ground voltage V 00 of the single-phase power supply, while the electrodes ( 1 ), ( 3 ), ( 5 ) are connected to the voltage V 10 .
- the resulting current paths 333 distribution is illustrated in FIG. 6 c . This also leaves substantial areas in between where no current flows and therefore those areas are not subjected to adequate RF heating. A lesion formed in this manner will also be very uneven and ineffective.
- multi-phase RF ablation has been found to be much more efficient than single-phase ablation.
- a lesion is created in one quarter of the time (e.g. 5-20 sec) than that required for the single-phase case. This is advantageous since it reduces the risk of possible displacement of the catheter during an ablation operation.
- the multi-phase RF ablations are typically conducted with delivered power in the range 10-40 W.
- the higher power setting being applied over a shorter duration such that the energy delivered each time is of the order of 100 joules.
- the diameter of a smaller electrode in the array should be greater than approximately 0.7 times that of a larger electrode.
- the total contact area of the electrodes with a tissue should be greater than approximately 0.2 times the area spanned by the array.
- the average inter-electrode distance should be approximately less than 2.5 times the average diameter of the electrodes in the array.
- a reasonably large lesion is created by multi-phase RF ablation with five electrodes. Furthermore, by judicious pairing of the electrodes, a two-phase RF supply is able to produce a fairly uniform lesion across the ablation zone spanned by the electrode array.
- a preferred electrode array is a five-electrode orthogonal electrode catheter array (OECA) that has been mentioned earlier.
- OECA five-electrode orthogonal electrode catheter array
- the five-electrode OECA has been disclosed in U.S. Pat. No. 4,940,064. Relevant portions of said disclosure are incorporated herein by reference.
- FIG. 7 a illustrates the five-electrode OECA in its fanned-out state.
- the OECA comprises an eight-french five-pole electrode catheter 401 . It has a central stylet 402 which when pulled from its distal end opens four side arms 403 in an orthogonal configuration. Each of the four arms 403 has a peripheral electrode 405 while the fifth electrode 409 is centrally located at the tip of the central stylet 402 . All five electrodes are hemispherical. Each peripheral electrode 405 is 2 mm in diameter while the central electrode is 2.7 mm in diameter. The inter-electrode distance from the central electrode to each peripheral electrode is 0.5 cm, and the distance between peripheral electrodes is 0.7 cm. The surface area of the catheter tip in an open position is 0.8 cm 2 .
- FIG. 7 b shows the footprints of the five-electrode OECA electrodes.
- the four peripheral electrodes 405 or ( 1 )-( 4 ) form a cross configuration.
- the fifth electrode 409 or ( 0 ) is located at the center of the cross.
- the orthogonal array of electrodes forms an RF ablation zone 411 .
- FIG. 8 a illustrates the five-electrode OECA being used as a two-phase ablation apparatus according to a preferred embodiment.
- a 600-KHz RF, two-phase energy source produces voltages V 00 , V 10 , V 20 , with V 00 being at ground potential and zero phase.
- the voltages V 10 , V 20 are approximately the same amplitude but have a phase-difference ⁇ 12 in the range: 70°-110°.
- the central electrode 409 is connected to V 00 .
- the peripheral electrodes 405 form two diagonal pairs. One pair is connected to V 00 , and the other pair to V 20 .
- FIG. 8 b illustrates the current distributions resulted from the two-phase configuration of FIG. 8 a .
- the two pairs of diagonal electrodes are ( 1 ), ( 3 ) and ( 2 ), ( 4 ) and they are connected to voltages V 10 , V 20 respectively.
- V 10 , V 20 voltages
- the RF current flow can be regarded as being of two sets for the purpose of discussion.
- One set is a cross configuration with current between the central electrode 409 and each of the peripheral electrodes 405 .
- the other set results from potential differences between adjacent pairs of peripheral electrodes, with the current circumscribing all four peripheral electrodes 405 .
- current paths 333 run across all adjacent pairs of electrode, substantially filling the ablation zone 411 .
- a square-shaped lesion of approximately 1.2 cm 2 area is formed in the RF ablation zone 411 .
- FIG. 9 a illustrates the five-electrode OECA being connected in a single-phase configuration for the purpose of comparison with the two-phase configuration of FIG. 8 a .
- a single-phase energy source only produces voltages V 00 , V 10 , with V 00 being at ground potential and zero phase.
- the central electrode 409 is connected to V 00 .
- All four peripheral electrodes 405 are connected to V 10 .
- FIG. 9 b illustrates the current distributions resulted from the single-phase configuration of FIG. 9 a . Only the set of current flow associated with the cross configuration remains. This set of current paths is between the central electrode 409 or ( 0 ) and each of the peripheral electrodes 405 or ( 1 )-( 4 ). Since there is no potential difference between any of the peripherals electrodes ( 1 )-( 4 ), no current path is formed circumscribing the four peripheral electrodes. This arrangement is unsatisfactory, as it leaves the RF ablation zone 411 with substantial areas not covered.
- FIG. 10 shows a graph of lesions size versus ablation energy for various example operating parameters for both the two-phase and single-phase RF applications of the five-electrode OECA.
- Two-phase RF ablation produces a greater change in the size of lesion per unit additional energy used (0.0081 cm 2 /J Vs. 0.00125 cm 2 /J) than the single-phase case.
- the lesions produced by two-phase ablation are double in size and utilize half of the total energy compared to that produced by single-phase ablation.
- the power setting in order to have greater control over the size of the lesions formed, it is preferable to have the power setting at 10 watts (0.0079 cm 2 /J) rather than at 20 watts (0.0055 cm 2 /J) or 40 watts (0.0022 cm 2 /J).
- the largest lesions produced with the two-phase RF configuration is found to be approximately 1.2 cm 2 .
- FIG. 11 illustrates the formation of a still larger lesion by successive adjacent ablations.
- lesions of the order of 6 cm 2 is probably required for ablative treatment of ventricular tachycardia (VT).
- a larger lesion 451 of this size can be created by six adjacent square-shaped lesions 411 . They can be formed by successive placements of the five-electrode OECA using two-phase RF energy. After each ablation, the electrode catheters is usually withdrawn to clean blood coagulum on the electrodes before the next attempt.
- the location of the next spot to be ablated is located by endocardiac mapping techniques such as ones described in a journal article by Desai et al, entitled, “Orthogonal Electrode Catheter Array for Mapping of Endocardiac Focal Site”, published in Pacing And Clinical Electrophysiology, Volume 14, pp. 557-574, April 1991. Relevant portions of the Desai et al publication is incorporated herein by reference.
- the two-phase RF ablation scheme produces early impedance rise as seen by the power supply due to efficient necrosis of tissues and possibly early coagulum formation at the electrode tips.
- the formation of coagulum has the effect of restricting the current flow through the tissues and limiting the depth of lesion formation. It is possible to alleviate this problem by tightly regulating the ablation temperature.
- Electrode tip temperature control has been implemented for conventional single-phase RF, standard electrode catheters ablation. This is disclosed in the journal article by Haines and Watson, “Tissue heating during radiofrequency catheter ablation: A thermodynamic model and observations in isolated profused and superfused canine right ventricular free wall”, PACE, vol. 12, 1989, pp. 962-976. Relevant portions of the Haines and Watson article are incorporated herein by reference.
- FIG. 12 shows a multi-phase RF ablation system having electrode tip temperature control, according to the present invention.
- An electrode catheter array 501 establishes electrical contact with a multi-phase power supply 511 by means of connections 521 .
- One or more temperature monitors such as thermistors 531 are incorporated in the electrodes 541 of the electrode array to monitor temperatures during ablation.
- the RF power supply 511 incorporates a power control circuit 551 that controls the power output to the electrode catheter array 501 in response to the temperature monitors 531 .
- the signals from the temperature monitors 531 is passed through lines 553 from the catheter to the power control circuit 551 .
- the ablation temperature can be maintained at an optimum predetermined level, preferably about 80° C. This would prevent early coagulum formation and help to produce larger and deeper lesions with more uniformity.
- the multi-phase ablation technique and apparatus described in connection with FIGS. 2-9 can be extended to a similar system that includes an additional auxiliary electrode.
- FIG. 13 illustrates schematically the multi-electrode catheter in FIG. 2 a in combination with an auxiliary electrode 40 connected to a multi-phase power supply 220 , according to another aspect of the present invention.
- the configuration shown in FIG. 13 is similar to that of FIG. 2 b except with the addition of an auxiliary electrode 40 .
- the auxiliary electrode 40 shown schematically is also connected to the multi-phase power supply to receive an RF voltage V 00 of a given phase.
- the auxiliary electrode 40 is a conducting backplate placed in contact with the back skin of a subject undergoing ablation.
- the catheter electrodes 201 , 203 results in current paths that tend to be lateral or parallel to the contacting surface. This produces lesions with good lateral cover over the surface 211 spanned by, and in contact with, the array of electrodes of the catheter.
- the lesion has a depth of about 2-4 mm. This type of characteristic is particularly suitable for ablation of the atrial wall of the heart, which is of comparable thickness.
- the present invention applies multi-phase power to the combination of the electrode array of the catheter and the backplate electrode to effect ablation.
- This has the advantage of combining the benefit the better lateral spread resulted from the use of the electrode array with the better depth resulted from the use of the backplate.
- power to the backplate and the array of electrodes is phased such that substantial currents flow both lateral and longitudinal to the internal surface under ablation. In this way, an ablation zone of greater volume with good lateral spread and depth is obtained.
- FIG. 14 a illustrates a preferred embodiment in which the five-electrode OECA in combination with a backplate electrode are being configured as a three-phase ablation apparatus.
- the configuration shown in FIG. 14 a is similar to that of FIG. 8 a except with the addition of an auxiliary electrode 40 .
- An RF energy source 220 produces voltages V 00 , V 10 , V 20 , V 30 , with V 00 being at ground potential and zero phase.
- the voltages V 10 , V 20 , V 30 are approximately the same amplitude but with a different phase.
- the backplate electrode 40 is connected to V 00 .
- the central electrode 409 is connected to V 10 .
- the peripheral electrodes 405 form two diagonal pairs. One pair is connected to V 10 , and the other pair to V 30 .
- the RF current flow can be regarded as being of three, sets for the purpose of discussion.
- One set is a cross configuration with current between the central electrode 409 and each of the peripheral electrodes 405 .
- the second set results from potential differences between adjacent pairs of peripheral electrodes, with the current circumscribing all four peripheral electrodes 405 .
- current paths 333 run across all adjacent pairs of electrode, substantially filling the ablation zone 411 .
- a square-shaped lesion of approximately 1.2 cm 2 area is formed in the RF ablation zone 411 .
- Current 335 now also flows from a electrode of the catheter to the backplate in a longitudinal direction.
- FIG. 14 b illustrates the five-electrode OECA in combination with a backplate electrode being configured as a two-phase ablation apparatus according to a preferred embodiment.
- the configuration shown in FIG. 14 b is similar to that of FIG. 9 a except with the addition of an auxiliary electrode 40 .
- an RF energy source 232 produces voltages V 00 , V 10 , V 20 , with V 00 being at ground potential and zero phase.
- the voltages V 10 , V 20 are approximately the same amplitude but with a different phase.
- the backplate electrode 40 is connected to V 00 .
- the central electrode 409 is connected to V 10 .
- All four peripheral electrodes 405 are connected to V 20 .
- the 2-phase configuration produces a cross pattern of current flow in the lateral direction (parallel to the surface) and also current flow 335 in the longitudinal direction.
- FIGS. 8 a and 9 a are directed to the lateral direction.
- the single-phase with a backplate configuration shown in FIG. 1 c is directed to the longitudinal direction. It is therefore advantageous to perform ablation with a programmed sequence of such configurations which provides better control over optimization of ablation in either direction.
- the elementary configurations contemplated also include those shown in FIG. 13 , FIG. 14 a and FIG. 14 b.
Abstract
Multi-phase RF ablation employing a two-dimensional or three-dimensional electrode array produces a multitude of currents paths on the surface of the ablation zone. This results in a uniform lesion with a size defined by the span of the electrode array. An orthogonal electrode catheter array suitable for cardiac ablation is used in conjunction with a two-phase RF power source to produce uniform square-shaped lesions of size 1.2 cm2. Lesions of larger size are created by successive adjacent placement of the square-shaped lesions. A temperature sensor at the electrode tip allows monitoring of ablation temperature and regulation of thereof to minimize the electrode tips from being fouled by coagulum. In another embodiment, an external auxiliary electrode is used in combination with the catheter electrodes. This also produces lesions of greater depth. In yet another embodiment, ablation is performed with a sequence of elementary electrode-electrical configurations.
Description
- This application is a continuation of application Ser. No. 10/452,550, filed on May 30, 2003, which in turn is a continuation of application Ser. No. 09/922,128, filed on Aug. 3, 2001, now abandoned, which in turn is a continuation of application Ser. No. 09/405,733, filed Sep. 24, 1999, now abandoned, which in turn is a continuation-in-part of application Ser. No. 08/318,427, filed on Oct. 5, 1994, now U.S. Pat. No. 5,693,078, which in turn is a continuation of application Ser. No. 07/726,035, filed on Jul. 5, 1991, now U.S. Pat. No. 5,383,917, which applications are incorporated herein in their entirety by this reference.
- This invention relates to medical devices and, in particular, a multi-electrode catheter and techniques therefor of employing multi-phase radia-frequency power source for ablation of endocardiac tissues.
- Cardiac dysrhythmias are commonly known as irregular heart beats or racing heart. Two such heart rhythm irregularities are the Wolff-Parkinson-White syndrome and atrioventricular (AV) nodal reentrant tachycardia. These conditions are caused by an extraneous strand of muscle fiber in the heart that provides an abnormal short-circuit pathway for electric impulses normally existing in the heart. For example, in one type of the Wolff-Parkinson-White syndrome the accessory pathway causes the electric impulses that normally travel from the upper to the lower chamber of the heart to be fed back to the upper chamber. Another common type of cardiac dysrhythmias is ventricular tachycardia (VT), which is a complication of a heart attack or reduction of blood supply to an area of heart muscle, and is a life threatening arrhythmia.
- In the treatment of cardiac dysrhythmias, non-surgical procedures such as management with drugs are favored. However, some dysrhythmias of the heart are not treatable with drugs. These patients are then treated with either surgical resection of VT site of origin or by Automatic implantable cardiovertor defibrillator (AICD). Both procedures have increased morbidity and mortality and are extremely expensive. Even AICD needs major surgical intervention. In addition, some patients of advanced age or illness cannot tolerate invasive surgery to excise tachycardia focus which causes dysrhythmias.
- Techniques have been developed to locate regions of tachycardia and to disable their short-circuit function. Electrical energy shocks are applied to ablate the cardiac tissues in those regions so as to produce scars and interrupt conduction.
- The regions to be ablated are usually determined by endocardiac mapping. It is a technique that typically involves percutaneously introducing an electrode catheter into the patient. The electrode catheter is passed through a blood vessel, like femoral vein or aorta and thence into an endocardiac site such as the atrium or ventricle of the heart. A tachycardia is induced and a continuous, simultaneous recording made with a multichannel recorder while the electrode catheter is moved to different endocardiac positions. When a tachycardial focus is located as indicated in an electrocardiogram recording, it is marked by means of a fluoroscope image.
- Upon locating of the tachycardial focus, ablation of cardiac arrhythmias is typically performed by means of a standard electrode catheter. The electrical energy shocks is used to create a lesion in the endocardiac tissues adjacent (i.e. underneath) the standard electrode catheter. By creating one or more lesions, the tachycardial focus may be turned into a region of necrotic tissue, thereby disabling any malfunctions.
- Conventional catheter ablation techniques have typically employed a catheter with a single electrode at its tip as one electrical pole. The other electrical pole is formed by a backplate in contact with a patient's external body part. These techniques have been used successfully for interruption or modification of conduction across the atrioventricular (AV) junction in AV nodal reentrant tachycardia; for interruption of accessory pathway, in patients with reentrant tachycardia due to Wolff-Parkinson-White Syndrome; and for ablation in some patients with ventricular tachycardia.
- In one technique, high voltage direct current (DC) in the range of 100-300 joules is applied across the electrode and the backplate to effect ablation. Direct current energy source using the standard electrode catheter can produce a lesion size larger than the footprint of the electrode. However, the lesion dimensions are variable at the same energy output and they do not have clear demarcation from the surrounding tissues. Additionally, high voltage techniques have other undesirable side-effects such as barotrauma and the lesions formed could become proarrhythmic.
- Another technique is to apply a radio-frequency (RF) source to a standard electrode catheter. The RF source is typically in the 600 kHz region and produces a sinusoidal voltage between two wires. When this is delivered between the distal tip of a standard electrode catheter and a backplate, it produces a localized RF heating effect. It causes a well defined, discrete lesion slightly larger than the tip electrode. This simple RF ablation technique creates lesion size sufficient for interruption of AV junction or accessory pathway.
- RF ablation is preferable to DC ablation because it does not need anesthesia and produces more circumscribed and discrete lesions and avoids injury caused by high voltages as in DC shock.
- Generally, catheter ablations of AV junction using standard electrode catheter with DC or RF energy for treating drug resistant supraventricular tachycardia have high success rate with very low incidence of complications.
- However, in ventricular tachycardia (VT), endocardiac mapping with a standard electrode catheter can locate the exit site of ventricular tachycardia to within 4-8 cm2 of the earliest site recorded by the catheter. A standard electrode catheter typically has a maximum electrode tip area of about 0.3 mm2. Therefore, the lesion created by the simple RF technique delivered through a standard electrode catheter may not be large enough to ablate the ventricular tachycardia. Attempts to increase the size of lesion by regulation of power and duration by increasing the size of electrode or by regulating the temperature of tip electrode have met with partial success.
- In order to increase the size of the lesion, an orthogonal electrode catheter array (OECA) with four peripheral electrodes and one central electrode, has been proposed. Such an OECA has been disclosed by Dr. Jawahar Desai in U.S. Pat. No. 4,940,064, issued Jul. 10, 1990, for use in both mapping and ablation of endocardiac sites.
- The four peripheral electrodes are actuable from a retracted or collapsed mode. When fanned out, the four peripheral electrodes and the central electrode form an electrode array that typically covers an area of about 0.8 cm2. When used with a conventional RF power source in conjunction with a backplate, the five connecting electrodes will typically produce five lesion spots distributed over the area spanned by the electrode array. However, this arrangement has been found to be unsatisfactory as there are substantial areas between the electrodes that remain unablated. Increasing the power only results in charring of the tissues and early fouling of the electrodes by coagulum formation.
- Thus, it is desirable, especially for treating ventricular tachycardia, to have catheter ablations that produce substantially larger, deeper and more uniform lesions than those produced by conventional RF schemes described above.
- Accordingly, it is a general object of the present invention to improve catheter ablations.
- It is an object of the present invention to improve cardiac catheter ablations.
- It is another object of the present invention to increase the size, depth and uniformity of lesions created by RF catheter ablations.
- It is yet another object of the present invention to improve the efficiency of RF catheter ablations.
- It is yet another object of the present invention to treat ventricular tachycardia by improved RF catheter ablations.
- These and additional objects are accomplished by application of a multi-phase RF power source to a two- or three-dimensional array of electrodes that is deployable from a catheter.
- In one embodiment, each electrode is supplied with an RF source having a different phase. In this way, potential differences are created between each pair of electrodes in the array, thereby allowing current to flow between each pair of electrodes in the array to form a more uniform heating pattern therein.
- In another embodiment, a simplified power connection configuration provides a phase difference between at least adjacent pairs of electrodes. In this way, potential differences are created between at least adjacent pairs of electrodes in the array, thereby allowing current to flow between each adjacent pair in the array to form a more uniform heating pattern therein.
- One important aspect of the present multi-phase RF scheme is that a conventional external contact backplate is not employed to connect to the ground terminal of the power supply to complete the circuit. Instead, one or more electrodes among the array are connected to the ground terminal of the multi-phase RF power supply. In this way, unlike the conventional schemes, the various RF currents do not flow perpendicular into the tissue between the electrodes and a backplate, but instead, flow parallel to the surface of the tissue between different pairs of electrodes. This arrangement allows various permutations of current paths to form on the tissue's surface, thereby adequately filling the ablation zone spanned by the array.
- According to a preferred embodiment of the invention, a two-phase RF power source is used in conjunction with an orthogonal electrode catheter array to create a square-shape lesion of size approximately 1.2 cm2. Lesions of larger size can be formed by successive adjacent placements of the electrode array. The orthogonal electrode catheter array comprises a central electrode and four peripheral electrodes. The central electrode is connected to a ground voltage of the power supply. The four peripheral electrodes form two diagonal pairs which are respectively connected to two individually phased voltages of the power supply. By this arrangement RF current is made to flow between all adjacent pairs of electrodes to substantially fill the ablation zone spanned by the array.
- According to another aspect of the invention, a temperature sensor is incorporated in at least one of the electrodes so as to monitor and maintain temperature of ablations at a predetermined level.
- According to another aspect of the invention, multi-phase RF ablation is accomplished with the two- or three-dimensional array of electrodes in combination with an additional auxiliary electrode. In the preferred embodiment, the auxiliary electrode is a backplate electrode commonly used in electrical energy ablation. While the two- or three-dimensional array of electrodes is deployed within a subject's body and is in contact with an internal surface to be ablated, the backplate forms an external electrode in contact with the external surface of a subject's body. Thus, the backplate electrode and the two- or-three-dimensional array of electrodes together form a larger set of electrodes to which multi-phase power can be supplied.
- When multi-phase RF voltages are applied to the electrode array of the catheter, the resulting current paths tend to be lateral or parallel to the contacting surface. When a single-phase voltage is applied between the electrodes array on one hand and the backplate on the other hand, the resulting current paths tend to be longitudinal or perpendicular to the contacting surface.
- The present invention applies multi-phase power to the combination of the electrode array of the catheter and the backplate electrode to effect ablation. This has the advantage of combining the benefit the lateral spread resulted from the use of the electrode array with the depth resulted from the use of the backplate. Typically, power to the backplate and the array of electrodes is phased such that substantial currents flow both lateral and longitudinal to the internal surface under ablation. In this way, a greater volume of ablation zone with good lateral spread and depth is obtained. For example, using the orthogonal electrode catheter array, a
lesion 10 mm by 10 mm by 12 mm deep is obtained. - According to another aspect of the invention, ablation is performed with a sequence of elementary electrode-electrical configurations. These configurations include single-phase RF between the catheter electrodes and the backplate, multi-phase RF between the catheter electrodes. In this way, ablation in the longitudinal and lateral directions, to which these configurations are respectively associated with, can be optimized more or less independently.
- Additional objects, features and advantages of the present invention will be understood from the following description of the preferred embodiments, which description should be taken in conjunction with the accompanying drawings.
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FIG. 1 a illustrates the conventional technique of single-phase radio-frequency ablation employing a standard electrode catheter; -
FIG. 1 b illustrates in more detail the ablation region shown inFIG. 1 a; -
FIG. 1 c illustrates schematically the electrode configuration of a multi-electrode catheter with the conventional RF power supply arrangement ofFIG. 1 a; -
FIG. 1 d illustrates the lesions formed by the multi-electrode array ofFIG. 1 c with conventional perpendicular ablation currents; -
FIG. 2 a illustrates schematically a multi-electrode catheter suitable for multi-phase RF ablation; -
FIG. 2 b illustrates schematically the electrical connections of the multi-electrode catheter inFIG. 2 a with a multi-phase power supply, according to the present invention; -
FIG. 3 a shows one embodiment of the multi-phase radio-frequency power supply inFIG. 2 b; -
FIG. 3 b is a schematic block diagram of the phase shifting circuit inFIG. 3 a; -
FIG. 4 shows another embodiment of the multi-phase RF power supply inFIG. 2 b; -
FIG. 5 a is a top plan view of the seven-electrode configuration ofFIG. 2 b, as powered by a multi-phase supply; -
FIG. 5 b illustrates the current distribution in a subset of adjacent electrodes of the multi-electrode array shown inFIG. 5 a; -
FIG. 5 c illustrates the sinuosodial voltages V10, V20 as a function of time; -
FIG. 6 a illustrates the current distributions of a seven-electrode configuration as powered by a multi-phase supply; -
FIG. 6 b illustrates the current distributions of a seven-electrode configuration as powered by a single-phase radio-frequency power supply; -
FIG. 6 c also shows the current distributions for a variation of the seven-electrode configuration as powered by a single-phase radio-frequency power supply; -
FIG. 7 a illustrates the five-electrode orthogonal electrode catheter array (OECA) in its fanned-out state; -
FIG. 7 b shows the footprints of the five-electrode OECA; -
FIG. 8 a illustrates the five-electrode OECA being used as a two-phase ablation apparatus according to a preferred embodiment; -
FIG. 8 b illustrates the current distributions resulted from the two-phase configuration ofFIG. 8 a; -
FIG. 9 a illustrates the five-electrode OECA being connected in a single-phase configuration for the purpose of comparison with the two-phase configuration ofFIG. 8 a; -
FIG. 9 b illustrates the current distributions resulted from the single-phase configuration ofFIG. 9 a; -
FIG. 10 shows a graph of lesions size versus ablation energy for various example operating parameters for both the two-phase and single-phase RF applications of the five-electrode OECA; -
FIG. 11 illustrates the formation of a still larger lesion by successive adjacent ablations; and -
FIG. 12 shows a multi-phase RF ablation system having electrode tip temperature control; -
FIG. 13 illustrates schematically the multi-electrode catheter ofFIG. 2 a in combination with an auxiliary electrode connected to a multi-phase power supply, according to another aspect-of the present invention; -
FIG. 14 a illustrates the five-electrode OECA in combination with a backplate electrode being configured as a three-phase ablation apparatus according to a preferred embodiment; -
FIG. 14 b illustrates the five-electrode OECA in combination with a backplate electrode being configured as a two-phase ablation apparatus according to a preferred embodiment. -
FIG. 1 a illustrates the conventional technique of single-phase radio-frequency (SPRF) ablation employing astandard electrode catheter 10. Anelectrode 20 is located at the tip of the catheter and is electrically connected to a single-phase RF energy source orpower supply 30. The other end of thepower supply 30 is connected to abackplate 40. Theelectrode 20 is typically hemispheric in shape with a diameter of not more than 0.3 mm so as to allow easy insertion into a patient's body. During operations, theelectrode 20 is placed adjacent a region to be ablated such asbiological tissues 50 inside a heart (endomyocardium). A closed circuit is formed with thebackplate 40 in contact with an external body part near the heart of the patient. RF current spreads perpendicularly from theelectrode catheter 20 to thebackplate 40 creating a lesion on theendomyocardium 50. -
FIG. 1 b illustrates in more detail the ablation region shown inFIG. 1 a. Since the RF current density is highest at theelectrode catheter 20 and decreases rapidly as it flows toward the backplate, the current density will be high enough to cause alesion 60 in a relatively small region surrounding the electrode catheter. - As discussed earlier this lesion is probably too small for application in ventricular tachycardia (VT). One possibility of increasing the lesion size is to use an array of electrodes disclosed in U.S. Pat. No. 4,940,064.
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FIG. 1 c illustrates schematically the electrode configuration of such a multi-electrode catheter with the conventional RF power supply arrangement ofFIG. 1 a. It comprises two crossed pairs ofelectrodes central electrode 67. The multiple electrodes, which are spread evenly over theendomyocardium 50, are all connected to one terminal 71 of thepower supply 30, and abackplate 40 is connected to the other terminal 73. RF currents flowing perpendicular to the surface of theendomyocardium 50 will be more spread out. -
FIG. 1 d illustrates the lesions formed by such an electrode array with perpendicular ablation currents. The ablation producesdiscrete lesions 81, each localized about one of the electrodes.Substantial areas 83 in between the electrodes remain unablated. - Multi-Phase RF Ablation
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FIG. 2 a illustrates schematically one embodiment of amulti-electrode catheter 200 suitable for multi-phase ablation. Thecatheter 200 comprises a plurality ofelectrodes 201 and a centrally locatedelectrode 203. The electrodes are capable of being collapsed onto the catheter body when the catheter is being introduced into a patient's body. During ablation operation they are fanned out into a two-dimensional or three-dimensional array as shown. -
FIG. 2 b illustrates schematically the electrical connections of the multi-electrode catheter inFIG. 2 a with a multi-phase power supply. Without loss of generality, a two-dimensional array of sevenelectrodes 201 are shown. During operations, the array of electrodes is placed adjacent a piece ofbiological tissue 60, such as a region of endomyocardium to effect ablation thereof. Theelectrodes 201 are preferably distributed evenly to form anablation zone 211. Eachelectrode 201 is connected to a voltage branch V10-V60 of a multi-phase radio-frequency energy source orpower supply 220 by means of aninterconnecting wire 221. The centrally locatedelectrode 203 is connected to a ground voltage V00 of thepower supply 220 via aninterconnecting wire 225. The multi-phaseRF power supply 220 preferably operates at an RF frequency of about 600 kHz. -
FIG. 3 a shows one embodiment of the multi-phase radio-frequency power supply inFIG. 2 b. It comprises a main single-phase power supply 231, theoutput 233 of which is sent in parallel to a plurality ofphase shifting circuits 241. The output voltages V10-V60 from thesephase shifting circuits 241 have substantially the same amplitudes, but their phases are shifted relative to each other. Referring also toFIG. 2 b, each individual phased voltage such as V10 is supplied via aline 221 to anelectrode 201 connected thereto. The central electrode is connected via theinterconnecting wire 225 to the ground voltage V00 at aterminal 251 of thepower supply 220. -
FIG. 3 b is a schematic block diagram of thephase shifting circuit 241 inFIG. 3 a. It comprises two reactive components Z1, Z2. They can be an RC or RL pair. If ZL is the load impedance of the electrode, then the phase shift is given-by the angle of:
Z 1ZL/[Z1ZL+Z2(Z1+ZL)]. -
FIG. 4 shows another embodiment of the multi-phase radio-frequency power supply 220 inFIG. 2 b. It comprises a plurality of individualRF power source 261. Each individualRF power source 261 is capable of delivering a voltage such as one of V10-V60 with independent amplitude and phase, one for eachelectrode 201 connected thereto. Thecentral electrode 203 is connected to a ground voltage V00 at the terminal 251. - One important aspect of the present multi-phase RF scheme is that an external contact backplate is not required to connect to the ground terminal of the power supply to complete the circuit. Instead, one or more electrodes among the array are connected to the ground terminal of the multi-phase RF power supply. In this way, unlike the conventional scheme shown in
FIGS. 1 a and 1 b, the various RF currents do not flow perpendicular into the tissue between the electrodes and a backplate, but instead, flow parallel to the surface of the tissue between different pairs of electrodes. This arrangement allows various permutations of current paths to form on the tissue's surface, thereby adequately filling the ablation zone spanned by the array. -
FIG. 5 a is a top plan view of the seven-electrode configuration ofFIG. 2 b, as powered by a multi-phase supply. The configuration comprises of acentral electrode 203 or (0) uniformly surrounded byperipheral electrodes 201 or (1)-(6). Although the multi-phase RF power supply is not explicitly shown, it will be understood that the electrodes (0)-(6) are 5 respectively connected to the V10-V60 voltage sources of thepower supply 220 shown inFIG. 2 b. - It can be seen from
FIG. 5 a that the central electrode (0) is adjacent to all six peripheral electrodes (1)-(6). On the other hand, a peripheral electrode such as the electrode (1) is adjacent to electrodes (0), (2) and (6). The rest of the electrodes (3), (4) and (5) are one electrode removed from the electrode (1). - By proper application of the multi-phase power supply, current flow is easily established between a peripheral electrode such as (1) and its adjacent electrodes (0), (2) and (6). It is also possible to have substantial current flow between a peripheral electrode such as (1) and the farther electrodes such as (3), (4) and (5). This is achieved by appropriate adjustment of the voltage amplitude and phase in each electrode in the array.
- The relation between current flow and phases among the electrodes is best illustrated by focusing attention on a peripheral electrode such as (1) and two of its adjacent electrodes such as (0) and (2).
-
FIG. 5 b illustrates the current distribution in a subset of adjacent electrodes (0), (1), (2) of the multi-electrode array shown inFIG. 5 a. The electrodes (0), (1), (2) are respectively connected to the voltages V00, V10, V20 shown inFIG. 2 b. Therefore, the potential difference developed across electrodes (1) and (0) is V10 and it causes a current to flow along apath 310 between the electrodes (1) and (0). Similarly, the potential difference developed across electrodes (2) and (0) is V20, and it causes a current to flow along apath 320 between the electrodes (2) and (0). A thirdcurrent path 312 between the electrodes (1) and (2) is best understood by reference also toFIG. 5 c. -
FIG. 5 c illustrates the sinuosodial voltages V10, V20 as a function of time. When a phase difference δθ12(=2πfδt12) exists between the pair of voltages V10, V20, a potential difference V12 is developed across the pair of adjacent electrodes (1) and (2). If V10 and V20 have the same amplitude, V, then,
V 12=2 V Sin(δθ12/2)Sin(2πft)
where f is the frequency in hertz. This voltage in turn causes a current to flow along thepath 312 between the electrodes (1) and (2). -
FIG. 6 a illustrates the current distributions of a seven-electrode configuration as powered by a multi-phase supply.- The phase difference between each adjacent pair of electrodes results in a potential difference and allows the currents to flow therebetween. Thus acurrent path 333 is formed between each pair of adjacent electrodes. This provides a fairly complete coverage of the ablation zone spanned by the electrode array. - Conversely, if a single-phase RF power supply is used in conjunction with the seven-electrode configuration, current will flow only between a few pairs of electrodes.
-
FIG. 6 b illustrates the current distributions of the seven-electrode configuration as powered by a single-phase radio-frequency power supply. With single phase RF energy, a maximum number of current paths is achieved by connecting the central electrode (0) to the ground voltage V00 of the single-phase power supply, and all the peripheral electrodes (1)-(6) to the voltages V10-V60 respectively. The resultingcurrent paths 333 distribution forms a series of spokes, each joining the central electrode (0) to one of the peripheral electrodes (1)-(6). This leaves substantial areas in between where no current flows and therefore those areas are not subjected to adequate RF heating. A lesion formed in this manner will be very uneven and ineffective. -
FIG. 6 c also shows the current distributions for a variation of the seven-electrode configuration as powered by a single-phase radio-frequency power supply. In this case, the electrodes (0), (2), (4), (6) are connected to the ground voltage V00 of the single-phase power supply, while the electrodes (1), (3), (5) are connected to the voltage V10. The resultingcurrent paths 333 distribution is illustrated inFIG. 6 c. This also leaves substantial areas in between where no current flows and therefore those areas are not subjected to adequate RF heating. A lesion formed in this manner will also be very uneven and ineffective. - Apart from the benefit of a more uniform lesion, multi-phase RF ablation has been found to be much more efficient than single-phase ablation. Typically, a lesion is created in one quarter of the time (e.g. 5-20 sec) than that required for the single-phase case. This is advantageous since it reduces the risk of possible displacement of the catheter during an ablation operation.
- The multi-phase RF ablations are typically conducted with delivered power in the range 10-40 W. The higher power setting being applied over a shorter duration such that the energy delivered each time is of the order of 100 joules.
- It has been found that multi-phase RF ablation can not function satisfactorily unless certain restrictions on the dimensions of the electrodes are adhered to. One constraint is that the diameter of a smaller electrode in the array should be greater than approximately 0.7 times that of a larger electrode. Another constraint is that the total contact area of the electrodes with a tissue should be greater than approximately 0.2 times the area spanned by the array. Yet another constraint is that the average inter-electrode distance should be approximately less than 2.5 times the average diameter of the electrodes in the array.
- Two-Phase RF Ablation
- In one preferred embodiment, a reasonably large lesion is created by multi-phase RF ablation with five electrodes. Furthermore, by judicious pairing of the electrodes, a two-phase RF supply is able to produce a fairly uniform lesion across the ablation zone spanned by the electrode array.
- A preferred electrode array is a five-electrode orthogonal electrode catheter array (OECA) that has been mentioned earlier. The five-electrode OECA has been disclosed in U.S. Pat. No. 4,940,064. Relevant portions of said disclosure are incorporated herein by reference.
-
FIG. 7 a illustrates the five-electrode OECA in its fanned-out state. The OECA comprises an eight-french five-pole electrode catheter 401. It has acentral stylet 402 which when pulled from its distal end opens fourside arms 403 in an orthogonal configuration. Each of the fourarms 403 has aperipheral electrode 405 while thefifth electrode 409 is centrally located at the tip of thecentral stylet 402. All five electrodes are hemispherical. Eachperipheral electrode 405 is 2 mm in diameter while the central electrode is 2.7 mm in diameter. The inter-electrode distance from the central electrode to each peripheral electrode is 0.5 cm, and the distance between peripheral electrodes is 0.7 cm. The surface area of the catheter tip in an open position is 0.8 cm2. -
FIG. 7 b shows the footprints of the five-electrode OECA electrodes. The fourperipheral electrodes 405 or (1)-(4) form a cross configuration. Thefifth electrode 409 or (0) is located at the center of the cross. The orthogonal array of electrodes forms anRF ablation zone 411. -
FIG. 8 a illustrates the five-electrode OECA being used as a two-phase ablation apparatus according to a preferred embodiment. A 600-KHz RF, two-phase energy source produces voltages V00, V10, V20, with V00 being at ground potential and zero phase. The voltages V10, V20 are approximately the same amplitude but have a phase-difference δθ12 in the range: 70°-110°. Thecentral electrode 409 is connected to V00. Theperipheral electrodes 405 form two diagonal pairs. One pair is connected to V00, and the other pair to V20. -
FIG. 8 b illustrates the current distributions resulted from the two-phase configuration ofFIG. 8 a. Corresponding to that ofFIG. 8 a, the two pairs of diagonal electrodes are (1), (3) and (2), (4) and they are connected to voltages V10, V20 respectively. As explained earlier, this will allow RF currents to flow between electrodes whenever a sufficient potential difference exists. In this case, the RF current flow can be regarded as being of two sets for the purpose of discussion. One set is a cross configuration with current between thecentral electrode 409 and each of theperipheral electrodes 405. The other set results from potential differences between adjacent pairs of peripheral electrodes, with the current circumscribing all fourperipheral electrodes 405. It can be seen thatcurrent paths 333 run across all adjacent pairs of electrode, substantially filling theablation zone 411. Thus, a square-shaped lesion of approximately 1.2 cm2 area is formed in theRF ablation zone 411. - Conversely, if a single-phase RF power supply is used in conjunction with the seven-electrode configuration, current will flow only between a few pairs of electrodes.
-
FIG. 9 a illustrates the five-electrode OECA being connected in a single-phase configuration for the purpose of comparison with the two-phase configuration ofFIG. 8 a. In this case, a single-phase energy source only produces voltages V00, V10, with V00 being at ground potential and zero phase. Thecentral electrode 409 is connected to V00. All fourperipheral electrodes 405 are connected to V10. -
FIG. 9 b illustrates the current distributions resulted from the single-phase configuration ofFIG. 9 a. Only the set of current flow associated with the cross configuration remains. This set of current paths is between thecentral electrode 409 or (0) and each of theperipheral electrodes 405 or (1)-(4). Since there is no potential difference between any of the peripherals electrodes (1)-(4), no current path is formed circumscribing the four peripheral electrodes. This arrangement is unsatisfactory, as it leaves theRF ablation zone 411 with substantial areas not covered. -
FIG. 10 shows a graph of lesions size versus ablation energy for various example operating parameters for both the two-phase and single-phase RF applications of the five-electrode OECA. Two-phase RF ablation produces a greater change in the size of lesion per unit additional energy used (0.0081 cm2/J Vs. 0.00125 cm2/J) than the single-phase case. The lesions produced by two-phase ablation are double in size and utilize half of the total energy compared to that produced by single-phase ablation. In two-phase ablation, in order to have greater control over the size of the lesions formed, it is preferable to have the power setting at 10 watts (0.0079 cm2/J) rather than at 20 watts (0.0055 cm2/J) or 40 watts (0.0022 cm2/J). The largest lesions produced with the two-phase RF configuration (at 20 watts for 20 seconds) is found to be approximately 1.2 cm2. -
FIG. 11 illustrates the formation of a still larger lesion by successive adjacent ablations. For example, lesions of the order of 6 cm2 is probably required for ablative treatment of ventricular tachycardia (VT). Alarger lesion 451 of this size can be created by six adjacent square-shapedlesions 411. They can be formed by successive placements of the five-electrode OECA using two-phase RF energy. After each ablation, the electrode catheters is usually withdrawn to clean blood coagulum on the electrodes before the next attempt. The location of the next spot to be ablated is located by endocardiac mapping techniques such as ones described in a journal article by Desai et al, entitled, “Orthogonal Electrode Catheter Array for Mapping of Endocardiac Focal Site”, published in Pacing And Clinical Electrophysiology, Volume 14, pp. 557-574, April 1991. Relevant portions of the Desai et al publication is incorporated herein by reference. - Temperature Regulated Multi-Phase RF Ablation
- The two-phase RF ablation scheme produces early impedance rise as seen by the power supply due to efficient necrosis of tissues and possibly early coagulum formation at the electrode tips. The formation of coagulum has the effect of restricting the current flow through the tissues and limiting the depth of lesion formation. It is possible to alleviate this problem by tightly regulating the ablation temperature.
- Electrode tip temperature control has been implemented for conventional single-phase RF, standard electrode catheters ablation. This is disclosed in the journal article by Haines and Watson, “Tissue heating during radiofrequency catheter ablation: A thermodynamic model and observations in isolated profused and superfused canine right ventricular free wall”, PACE, vol. 12, 1989, pp. 962-976. Relevant portions of the Haines and Watson article are incorporated herein by reference.
-
FIG. 12 shows a multi-phase RF ablation system having electrode tip temperature control, according to the present invention. Anelectrode catheter array 501 establishes electrical contact with amulti-phase power supply 511 by means ofconnections 521. One or more temperature monitors such asthermistors 531 are incorporated in theelectrodes 541 of the electrode array to monitor temperatures during ablation. TheRF power supply 511 incorporates apower control circuit 551 that controls the power output to theelectrode catheter array 501 in response to the temperature monitors 531. The signals from the temperature monitors 531 is passed throughlines 553 from the catheter to thepower control circuit 551. Thus, the ablation temperature can be maintained at an optimum predetermined level, preferably about 80° C. This would prevent early coagulum formation and help to produce larger and deeper lesions with more uniformity. - Multi-Phase Ablation with an Auxiliary Electrode
- In another embodiment, the multi-phase ablation technique and apparatus described in connection with
FIGS. 2-9 can be extended to a similar system that includes an additional auxiliary electrode. -
FIG. 13 illustrates schematically the multi-electrode catheter inFIG. 2 a in combination with anauxiliary electrode 40 connected to amulti-phase power supply 220, according to another aspect of the present invention. The configuration shown inFIG. 13 is similar to that ofFIG. 2 b except with the addition of anauxiliary electrode 40. Theauxiliary electrode 40 shown schematically is also connected to the multi-phase power supply to receive an RF voltage V00 of a given phase. In practice, theauxiliary electrode 40 is a conducting backplate placed in contact with the back skin of a subject undergoing ablation. - As described earlier, supplying multi-phase RF power to the
catheter electrodes surface 211 spanned by, and in contact with, the array of electrodes of the catheter. Typically, the lesion has a depth of about 2-4 mm. This type of characteristic is particularly suitable for ablation of the atrial wall of the heart, which is of comparable thickness. - However, in ablation of the ventricle wall, for example, it is desirable to have lesions with a depth of about 10 mm. A deeper lesion can be produced by a single-phase voltage applied between the electrodes,
array backplate 40 on the other hand. The resulting current paths tend to be longitudinal or perpendicular to the contactingsurface 60. While this configuration produces lesions with better depth than that from the multi-phase powered catheter electrodes, the lateral coverage is poor. - The present invention applies multi-phase power to the combination of the electrode array of the catheter and the backplate electrode to effect ablation. This has the advantage of combining the benefit the better lateral spread resulted from the use of the electrode array with the better depth resulted from the use of the backplate. Typically, power to the backplate and the array of electrodes is phased such that substantial currents flow both lateral and longitudinal to the internal surface under ablation. In this way, an ablation zone of greater volume with good lateral spread and depth is obtained.
-
FIG. 14 a illustrates a preferred embodiment in which the five-electrode OECA in combination with a backplate electrode are being configured as a three-phase ablation apparatus. The configuration shown inFIG. 14 a is similar to that ofFIG. 8 a except with the addition of anauxiliary electrode 40. AnRF energy source 220 produces voltages V00, V10, V20, V30, with V00 being at ground potential and zero phase. The voltages V10, V20, V30 are approximately the same amplitude but with a different phase. Thebackplate electrode 40 is connected to V00. Thecentral electrode 409 is connected to V10. Theperipheral electrodes 405 form two diagonal pairs. One pair is connected to V10, and the other pair to V30. - This 3-phase configuration will allow RF currents to flow between electrodes whenever a sufficient potential difference exists. In this case, the RF current flow can be regarded as being of three, sets for the purpose of discussion. One set is a cross configuration with current between the
central electrode 409 and each of theperipheral electrodes 405. The second set results from potential differences between adjacent pairs of peripheral electrodes, with the current circumscribing all fourperipheral electrodes 405. It can be seen thatcurrent paths 333 run across all adjacent pairs of electrode, substantially filling theablation zone 411. Thus, a square-shaped lesion of approximately 1.2 cm2 area is formed in theRF ablation zone 411. With the addition of thebackplate electrode 40, a third set of current flow is possible. Current 335 now also flows from a electrode of the catheter to the backplate in a longitudinal direction. - Generally, the voltages and phases is chosen so that approximately equal amount of current flow between the different catheter electrodes and also the backplate electrode. For example, with V10=30V,+35°; V20=40V, 0°; V30−30V, −35°, a
lesion 10 mm by 10 mm by 12 mm deep is produced. -
FIG. 14 b illustrates the five-electrode OECA in combination with a backplate electrode being configured as a two-phase ablation apparatus according to a preferred embodiment. The configuration shown inFIG. 14 b is similar to that ofFIG. 9 a except with the addition of anauxiliary electrode 40. In this case, anRF energy source 232 produces voltages V00, V10, V20, with V00 being at ground potential and zero phase. The voltages V10, V20, are approximately the same amplitude but with a different phase. Thebackplate electrode 40 is connected to V00. Thecentral electrode 409 is connected to V10. All fourperipheral electrodes 405 are connected to V20. - The 2-phase configuration produces a cross pattern of current flow in the lateral direction (parallel to the surface) and also
current flow 335 in the longitudinal direction. - Combination Phase Cycle Ablation
- As described earlier, by application of appropriate voltages and phases to the catheter electrodes and the backplate electrode, currents can be made to flow in both lateral and longitudinal direction relative to the contact surface. However, the conduction characteristics in these two directions are different, and to achieve a certain current configuration and duration among the various electrode may require a series of complex waveforms to be generated by the power supply.
- A simpler approach is to perform ablation with a combination of elementary configurations. For example, the configurations shown in
FIGS. 8 a and 9 a are directed to the lateral direction. The single-phase with a backplate configuration shown inFIG. 1 c is directed to the longitudinal direction. It is therefore advantageous to perform ablation with a programmed sequence of such configurations which provides better control over optimization of ablation in either direction. In general, the elementary configurations contemplated also include those shown inFIG. 13 ,FIG. 14 a andFIG. 14 b. - While the embodiments of the various aspects of the present invention that have been described are the preferred implementation, those skilled in the art will understand that variation thereof may also be possible. The device and method described therein are applicable to ablation of biological tissues in general. Therefore, the invention is entitled to protection within the full scope of the appended claims.
Claims (1)
1. A radio-frequency ablation apparatus for biological tissues, comprising:
an electrode catheter having an array of electrodes;
an auxiliary electrode in electrical contact with the biological tissues; and
means for supplying individually phased RF voltages to each of said plurality of electrodes, such that, over a predetermined period of time, substantial potential difference exists between substantially any two electrodes of said array of electrodes and said auxiliary electrode to effect RF heating therebetween in order to achieve uniform ablation of biological tissues adjacent to said array of electrodes.
Priority Applications (1)
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US11/611,741 US20070093806A1 (en) | 1991-07-05 | 2006-12-15 | Device and Method for Multi-Phase Radio-Frequency Ablation |
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Application Number | Priority Date | Filing Date | Title |
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US07/726,035 US5383917A (en) | 1991-07-05 | 1991-07-05 | Device and method for multi-phase radio-frequency ablation |
US08/318,427 US5693078A (en) | 1991-07-05 | 1994-10-05 | Device and method for multi-phase radio-frequency ablation |
US40573399A | 1999-09-24 | 1999-09-24 | |
US09/922,128 US20010051803A1 (en) | 1991-07-05 | 2001-08-03 | Device and method for multi-phase radio-frequency ablation |
US10/452,550 US7151964B2 (en) | 1991-07-05 | 2003-05-30 | Device and method for multi-phase radio-frequency ablation |
US11/611,741 US20070093806A1 (en) | 1991-07-05 | 2006-12-15 | Device and Method for Multi-Phase Radio-Frequency Ablation |
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US10/452,550 Continuation US7151964B2 (en) | 1991-07-05 | 2003-05-30 | Device and method for multi-phase radio-frequency ablation |
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US08/318,427 Expired - Lifetime US5693078A (en) | 1991-07-05 | 1994-10-05 | Device and method for multi-phase radio-frequency ablation |
US11/611,741 Abandoned US20070093806A1 (en) | 1991-07-05 | 2006-12-15 | Device and Method for Multi-Phase Radio-Frequency Ablation |
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US8388615B2 (en) | 2008-10-28 | 2013-03-05 | Smith & Nephew, Inc. | Electrosurgical device with controllable electric field profile |
US20100145329A1 (en) * | 2008-10-28 | 2010-06-10 | Smith & Nephew, Inc. | Electrosurgical Device with Controllable Electric Field Profile |
US8500729B2 (en) | 2008-10-28 | 2013-08-06 | Smith & Nephew, Inc. | Electrosurgical device with controllable electric field profile |
EP3329875A1 (en) | 2009-05-08 | 2018-06-06 | St. Jude Medical Luxembourg Holding S.à.r.l. | Apparatus for controlling lesion size in catheter-based ablation treatment |
US10159528B2 (en) | 2009-05-08 | 2018-12-25 | St Jude Medical International Holding S.À R.L. | Method for predicting the probability of steam pop in RF ablation therapy |
DE202010018025U1 (en) | 2009-05-08 | 2013-11-07 | Endosense Sa | Device for controlling a lesion size |
US8641705B2 (en) | 2009-05-08 | 2014-02-04 | Endosense Sa | Method and apparatus for controlling lesion size in catheter-based ablation treatment |
US11504183B2 (en) | 2009-05-08 | 2022-11-22 | St. Jude Medical International Holdings S.A R. L. | Method for predicting the probability of steam pop in RF ablation therapy |
US20100298826A1 (en) * | 2009-05-08 | 2010-11-25 | Giovanni Leo | Method and apparatus for controlling lesion size in catheter-based ablation treatment |
US9237920B2 (en) | 2009-05-08 | 2016-01-19 | St. Jude Medical Luxembourg Holding S.À.R.L. | Method and apparatus for controlling lesion size in catheter-based ablation |
EP3037055A1 (en) | 2009-05-08 | 2016-06-29 | St. Jude Medical Luxembourg Holding S.à.r.l. | Method and apparatus for controlling lesion size in catheter-based ablation treatment |
US9393068B1 (en) | 2009-05-08 | 2016-07-19 | St. Jude Medical International Holding S.À R.L. | Method for predicting the probability of steam pop in RF ablation therapy |
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US10111607B2 (en) | 2009-05-08 | 2018-10-30 | St Jude Medical International Holding S.À R.L. | Method and apparatus for controlling lesion size in catheter-based ablation treatment |
US9149327B2 (en) | 2010-12-27 | 2015-10-06 | St. Jude Medical Luxembourg Holding S.À.R.L. | Prediction of atrial wall electrical reconnection based on contact force measured during RF ablation |
US10492846B2 (en) | 2010-12-27 | 2019-12-03 | St. Jude Medical International Holding S.á r.l. | Prediction of atrial wall electrical reconnection based on contact force measured during RF ablation |
CN103908334A (en) * | 2012-12-31 | 2014-07-09 | 上海微创电生理医疗科技有限公司 | Multi-electrode ablation catheter |
US11878095B2 (en) | 2018-12-11 | 2024-01-23 | Biosense Webster (Israel) Ltd. | Balloon catheter with high articulation |
CN110063786A (en) * | 2019-04-25 | 2019-07-30 | 复旦大学 | Based on the controllable multi-channel rf ablation system of amplitude |
US11850051B2 (en) | 2019-04-30 | 2023-12-26 | Biosense Webster (Israel) Ltd. | Mapping grid with high density electrode array |
US11950930B2 (en) | 2019-12-12 | 2024-04-09 | Biosense Webster (Israel) Ltd. | Multi-dimensional acquisition of bipolar signals from a catheter |
US11918341B2 (en) | 2019-12-20 | 2024-03-05 | Biosense Webster (Israel) Ltd. | Selective graphical presentation of electrophysiological parameters |
US11950841B2 (en) | 2020-09-22 | 2024-04-09 | Biosense Webster (Israel) Ltd. | Basket catheter having insulated ablation electrodes and diagnostic electrodes |
US11950840B2 (en) | 2020-09-22 | 2024-04-09 | Biosense Webster (Israel) Ltd. | Basket catheter having insulated ablation electrodes |
US11918383B2 (en) | 2020-12-21 | 2024-03-05 | Biosense Webster (Israel) Ltd. | Visualizing performance of catheter electrodes |
CN113679467A (en) * | 2021-08-10 | 2021-11-23 | 南京麦澜德医疗科技股份有限公司 | Variable phase array electrode device |
WO2024044020A1 (en) * | 2022-08-24 | 2024-02-29 | Atricure, Inc. | Methods and apparatus for performing ablation of tissue |
Also Published As
Publication number | Publication date |
---|---|
EP0598742B1 (en) | 1999-08-04 |
EP1382368A1 (en) | 2004-01-21 |
JP3548155B2 (en) | 2004-07-28 |
MX9203954A (en) | 1993-01-01 |
WO1993000958A1 (en) | 1993-01-21 |
US5383917A (en) | 1995-01-24 |
EP0598742A1 (en) | 1994-06-01 |
AU2248592A (en) | 1993-02-11 |
EP0904800B8 (en) | 2004-03-03 |
JP2002238917A (en) | 2002-08-27 |
DE69233240T2 (en) | 2004-08-05 |
CA2112821A1 (en) | 1993-01-21 |
JP3428013B2 (en) | 2003-07-22 |
EP0904800A2 (en) | 1999-03-31 |
ES2133323T3 (en) | 1999-09-16 |
DE69233240D1 (en) | 2003-12-04 |
EP0904800B1 (en) | 2003-10-29 |
DE69229735T2 (en) | 1999-12-02 |
US5693078A (en) | 1997-12-02 |
JPH07500025A (en) | 1995-01-05 |
CA2112821C (en) | 2002-08-20 |
EP0598742A4 (en) | 1994-08-24 |
AU663511B2 (en) | 1995-10-12 |
DE69229735D1 (en) | 1999-09-09 |
EP0904800A3 (en) | 1999-08-11 |
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