US20060235376A1 - Methods and apparatus for hemostasis following arterial catheterization - Google Patents

Methods and apparatus for hemostasis following arterial catheterization Download PDF

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Publication number
US20060235376A1
US20060235376A1 US11/471,537 US47153706A US2006235376A1 US 20060235376 A1 US20060235376 A1 US 20060235376A1 US 47153706 A US47153706 A US 47153706A US 2006235376 A1 US2006235376 A1 US 2006235376A1
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hemostasis
catheter introducer
artery
puncture
hemostasis device
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US11/471,537
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Hayim Lindenbaum
Shimon Eckhouse
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Cardiodex Ltd
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Cardiodex Ltd
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Priority to US11/471,537 priority Critical patent/US20060235376A1/en
Publication of US20060235376A1 publication Critical patent/US20060235376A1/en
Priority to US12/396,228 priority patent/US20090163903A1/en
Assigned to CARDIODEX LTD. reassignment CARDIODEX LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LINDENBAUM, HAYIM, ECKHOUSE, SHIMON
Abandoned legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/0057—Implements for plugging an opening in the wall of a hollow or tubular organ, e.g. for sealing a vessel puncture or closing a cardiac septal defect
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/08—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by means of electrically-heated probes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00017—Electrical control of surgical instruments
    • A61B2017/00022—Sensing or detecting at the treatment site
    • A61B2017/00026—Conductivity or impedance, e.g. of tissue

Definitions

  • the present invention relates to methods and apparatus for hemostasis following arterial catheterization.
  • the present invention seeks to provide improved apparatus and techniques for measuring the progress of and accelerating hemostasis.
  • a method for monitoring the progress of hemostasis of an artery having a puncture after arterial catheterization the catheterization using a catheter introducer, the method including the steps of inserting into an artery a catheter introducer prior to arterial catheterization, following arterial catheterization, introducing a hemostasis device into the catheter introducer, such that a forward end of the hemostasis device lies exterior of the artery adjacent a puncture in a wall of the artery, during hemostasis, measuring the heat conductivity of blood in the vicinity of the puncture, thereby to provide an output indication of the progress of hemostasis and following hemostasis, removing the catheter introducer and the hemostasis device from the patient.
  • the method also includes inflating a balloon attached to the catheter introducer to block the puncture, prior to the introducing a hemostasis device. Additionally, the removing the catheter introducer also includes deflating the balloon prior to removing the catheter introducer.
  • a method for accelerating hemostasis of an artery having a puncture after arterial catheterization the catheterization using a catheter introducer, the method including the steps of inserting into an artery a catheter introducer prior to arterial catheterization, following arterial catheterization, introducing a hemostasis device into the catheter introducer, such that a forward end of the hemostasis device lies exterior of the artery adjacent a puncture in a wall of the artery, accelerating hemostasis by heating blood in the vicinity of the puncture, thereby shortening the time required for hemostasis and following hemostasis, removing the catheter introducer and hemostasis device from the patient.
  • the method also includes inflating a balloon attached to the catheter introducer to block the puncture, prior to the introducing a hemostasis device. Additionally, the removing the catheter introducer also includes deflating the balloon prior to removing the catheter introducer.
  • the method also includes measuring the heat conductivity of blood in the vicinity of the puncture during hemostasis, thereby to provide an output indication of the progress of hemostasis.
  • a hemostasis device including a resistance element, disposed at a forward end of the hemostasis device, a resistance sensor and a resistance indicator, operative to provide an indication of the resistance at the resistance sensor.
  • the hemostasis device also includes a power supply serially connected to the resistance element, the resistance sensor and the resistance indicator.
  • the power supply is operative to supply a high level current to the resistance element.
  • the power supply is operative to supply a low level current to the resistance sensor.
  • FIGS. 1A and 1B are simplified pictorial illustrations of respective first and second modes of operation of a hemostasis device constructed and operative in accordance with a preferred embodiment of the present invention
  • FIG. 2 is a simplified pictorial illustration of the hemostasis device of FIGS. 1A and 1B during hemostasis;
  • FIGS. 3A and 3B are graphs illustrating the typical conductivity levels measured by the hemostasis device when used in the operating modes shown in FIGS. 1A and 1B , respectively.
  • FIGS. 1A and 1B are simplified pictorial illustrations of a preferred embodiment of a hemostasis device in respective first and second modes of operation.
  • a hemostasis device 10 is inserted into a catheter introducer 11 , following arterial catheterization and withdrawal of a catheter (not shown), such that a forward end 12 of the hemostasis device 10 lies adjacent to and outside a puncture 14 in an artery 16 .
  • At least one external balloon 18 is preferably disposed adjacent catheter introducer 11 and is shown in an inflated orientation, wherein the balloon 18 forms a skirt surrounding and sealing puncture 14 from the tissue external thereto.
  • blood normally fills artery 16 as well as puncture 14 , as well as the annular volume 20 surrounded by balloon 18 adjacent puncture 14 and forward end 12 .
  • the at least one balloon 18 need not be provided.
  • a resistance element 22 is disposed at a forward edge 24 of the forward end 12 , and is coupled in series with an external power supply 26 via conductors 28 , which typically extend along the length of the hemostasis device 10 .
  • the series connection includes a resistance indicator 30 , which provides an indication of the resistance at a resistance sensor 32 .
  • a low level current is provided by external power supply 26 to enable the resistance indicator 30 to monitor the progress of hemostasis, to allow for timely removal of catheter introducer 11 and hemostasis device 10 from the patient.
  • the heat conductivity of the blood in liquid form is measurably different from that of a blood clot formed during hemostasis, as will be described hereinbelow with reference to FIGS. 3A and 3B .
  • FIG. 1B illustrates the hemostasis device of FIG. 1A in a second preferred mode of operation.
  • a high level electrical current typically greater than 0.1 ampere
  • the provision of this current causes heating of the blood adjacent to the resistance element 22 and provides for accelerated hemostasis.
  • resistance indicator 30 connected to resistance sensor 32 , enables the monitoring of the progress of the accelerated hemostasis, to allow for regulation of the current provided to resistance element 22 over time, and to allow timely removal of catheter introducer 11 and hemostasis device 10 from the patient.
  • the heat conductivity of the blood in liquid form is measurably different from that of a blood clot formed during hemostasis, as will be described hereinbelow with reference to FIGS. 3A and 3B .
  • FIG. 2 is a simplified pictorial illustration of hemostasis device 10 of FIGS. 1A and 1B during hemostasis.
  • FIG. 2 shows the hemostasis device 10 of FIGS. 1A and 1B and illustrates the different heat conductivity of the blood during the various stages of hemostasis.
  • the blood flowing through the artery 16 and adjacent the puncture 14 in the artery is in liquid form, where its heat conductivity is greater than that of the blood 40 which has begun to coagulate.
  • Blood 40 is in a viscous form, which has a heat conductivity greater than that of the blood 42 , which has already begun to solidify into a blood clot.
  • Resistance sensor 32 is thus able to measure the process of coagulation by measuring the heat conductivity of the adjacent blood.
  • FIGS. 3A and 3B are graphs illustrating the typical conductivity levels measured by the catheter introducer assembly when used in the operating modes shown in FIGS. 1A and 1B , respectively.
  • FIG. 3A shows the heat conductivity of the blood over time, in the mode of operation illustrated in FIG. 1A , where the blood is in a liquid form at time T 0 , with relatively high heat conductivity, where the heat conductivity decreases gradually over time as the blood forms a clot at time T H .
  • FIG. 3B shows the heat conductivity of the blood over time, in the mode of operation illustrated in FIG. 1B , where the blood is heated to accelerate clotting.
  • the heat conductivity begins at time T 0 in a liquid form with relatively high heat conductivity, which decreases rapidly as the blood is heated and the clotting occurs at an accelerated rate.
  • FIG. 3B also shows the heat conductivity curve over time shown in FIG. 3A , which clearly illustrates the accelerated hemostasis described in reference to FIG. 1B hereinabove, where T HA is the accelerated hemostasis time and T H is the non-accelerated hemostasis time.

Abstract

A method for accelerating hemostasis of an artery having a puncture after arterial catheterization, the catheterization using a catheter introducer, the method including the steps of inserting into an artery a catheter introducer prior to arterial catheterization, following arterial catheterization, introducing a hemostasis device into the catheter introducer, such that a forward end of the hemostasis device lies exterior of the artery adjacent a puncture in a wall of the artery, accelerating hemostasis by heating blood in the vicinity of the puncture, thereby shortening the time required for hemostasis and following hemostasis, removing the catheter introducer and hemostasis device from the patient. A method for monitoring the progress of hemostasis of an artery is also disclosed.

Description

    FIELD OF THE INVENTION
  • The present invention relates to methods and apparatus for hemostasis following arterial catheterization.
    • BACKGROUND OF THE INVENTION
  • Various techniques are known for arterial catheterization. Following arterial catheterization, it is necessary to promote hemostasis quickly and without undue hardship for the patient.
  • Applicant's U.S. Pat. Nos. 5,728,134 and 6,048,358, and published PCT Applications WO 98/11830 and WO 00/02488 describe methods and apparatus for hemostasis which greatly simplify hemostasis and thus greatly reduce patient discomfort following arterial catheterization. These patent documents, the disclosures of which are hereby incorporated by reference, and the prior art referenced therein are considered to represent the state of the art.
    • SUMMARY OF THE INVENTION
  • The present invention seeks to provide improved apparatus and techniques for measuring the progress of and accelerating hemostasis.
  • There is thus provided in accordance with a preferred embodiment of the present invention a method for monitoring the progress of hemostasis of an artery having a puncture after arterial catheterization, the catheterization using a catheter introducer, the method including the steps of inserting into an artery a catheter introducer prior to arterial catheterization, following arterial catheterization, introducing a hemostasis device into the catheter introducer, such that a forward end of the hemostasis device lies exterior of the artery adjacent a puncture in a wall of the artery, during hemostasis, measuring the heat conductivity of blood in the vicinity of the puncture, thereby to provide an output indication of the progress of hemostasis and following hemostasis, removing the catheter introducer and the hemostasis device from the patient.
  • Preferably, the method also includes inflating a balloon attached to the catheter introducer to block the puncture, prior to the introducing a hemostasis device. Additionally, the removing the catheter introducer also includes deflating the balloon prior to removing the catheter introducer.
  • There is also provided in accordance with another preferred embodiment of the present invention a method for accelerating hemostasis of an artery having a puncture after arterial catheterization, the catheterization using a catheter introducer, the method including the steps of inserting into an artery a catheter introducer prior to arterial catheterization, following arterial catheterization, introducing a hemostasis device into the catheter introducer, such that a forward end of the hemostasis device lies exterior of the artery adjacent a puncture in a wall of the artery, accelerating hemostasis by heating blood in the vicinity of the puncture, thereby shortening the time required for hemostasis and following hemostasis, removing the catheter introducer and hemostasis device from the patient.
  • In accordance with another preferred embodiment of the present invention the method also includes inflating a balloon attached to the catheter introducer to block the puncture, prior to the introducing a hemostasis device. Additionally, the removing the catheter introducer also includes deflating the balloon prior to removing the catheter introducer.
  • Alternatively or additionally, the method also includes measuring the heat conductivity of blood in the vicinity of the puncture during hemostasis, thereby to provide an output indication of the progress of hemostasis.
  • There is further provided in accordance with still another preferred embodiment of the present invention a hemostasis device including a resistance element, disposed at a forward end of the hemostasis device, a resistance sensor and a resistance indicator, operative to provide an indication of the resistance at the resistance sensor.
  • In accordance with another preferred embodiment of the present invention, the hemostasis device also includes a power supply serially connected to the resistance element, the resistance sensor and the resistance indicator. Preferably, the power supply is operative to supply a high level current to the resistance element. Alternatively, the power supply is operative to supply a low level current to the resistance sensor.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • The present invention will be understood and appreciated more fully from which the following detailed description taken in conjunction with the drawings in which:
  • FIGS. 1A and 1B are simplified pictorial illustrations of respective first and second modes of operation of a hemostasis device constructed and operative in accordance with a preferred embodiment of the present invention;
  • FIG. 2 is a simplified pictorial illustration of the hemostasis device of FIGS. 1A and 1B during hemostasis; and
  • FIGS. 3A and 3B are graphs illustrating the typical conductivity levels measured by the hemostasis device when used in the operating modes shown in FIGS. 1A and 1B, respectively.
    • DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
  • Reference is now made to FIGS. 1A and 1B, which are simplified pictorial illustrations of a preferred embodiment of a hemostasis device in respective first and second modes of operation.
  • As seen in FIG. 1A, a hemostasis device 10 is inserted into a catheter introducer 11, following arterial catheterization and withdrawal of a catheter (not shown), such that a forward end 12 of the hemostasis device 10 lies adjacent to and outside a puncture 14 in an artery 16. At least one external balloon 18 is preferably disposed adjacent catheter introducer 11 and is shown in an inflated orientation, wherein the balloon 18 forms a skirt surrounding and sealing puncture 14 from the tissue external thereto. At this stage blood normally fills artery 16 as well as puncture 14, as well as the annular volume 20 surrounded by balloon 18 adjacent puncture 14 and forward end 12.
  • In accordance with another preferred embodiment of the present invention, the at least one balloon 18 need not be provided.
  • In accordance with a preferred embodiment of the present invention, a resistance element 22 is disposed at a forward edge 24 of the forward end 12, and is coupled in series with an external power supply 26 via conductors 28, which typically extend along the length of the hemostasis device 10. Preferably, the series connection includes a resistance indicator 30, which provides an indication of the resistance at a resistance sensor 32.
  • As seen in FIG. 1A, a low level current, typically less than 0.1 ampere, is provided by external power supply 26 to enable the resistance indicator 30 to monitor the progress of hemostasis, to allow for timely removal of catheter introducer 11 and hemostasis device 10 from the patient.
  • It is appreciated that the heat conductivity of the blood in liquid form is measurably different from that of a blood clot formed during hemostasis, as will be described hereinbelow with reference to FIGS. 3A and 3B.
  • FIG. 1B illustrates the hemostasis device of FIG. 1A in a second preferred mode of operation. As shown in FIG. 1B, a high level electrical current, typically greater than 0.1 ampere, is supplied via the external power supply 26 to resistance element 22. The provision of this current causes heating of the blood adjacent to the resistance element 22 and provides for accelerated hemostasis. The provision of resistance indicator 30, connected to resistance sensor 32, enables the monitoring of the progress of the accelerated hemostasis, to allow for regulation of the current provided to resistance element 22 over time, and to allow timely removal of catheter introducer 11 and hemostasis device 10 from the patient.
  • It is appreciated that the heat conductivity of the blood in liquid form is measurably different from that of a blood clot formed during hemostasis, as will be described hereinbelow with reference to FIGS. 3A and 3B.
  • Reference is now made to FIG. 2, which is a simplified pictorial illustration of hemostasis device 10 of FIGS. 1A and 1B during hemostasis.
  • FIG. 2 shows the hemostasis device 10 of FIGS. 1A and 1B and illustrates the different heat conductivity of the blood during the various stages of hemostasis. As seen in FIG. 2, the blood flowing through the artery 16 and adjacent the puncture 14 in the artery is in liquid form, where its heat conductivity is greater than that of the blood 40 which has begun to coagulate. Blood 40 is in a viscous form, which has a heat conductivity greater than that of the blood 42, which has already begun to solidify into a blood clot. Resistance sensor 32 is thus able to measure the process of coagulation by measuring the heat conductivity of the adjacent blood.
  • Reference is now made to FIGS. 3A and 3B, which are graphs illustrating the typical conductivity levels measured by the catheter introducer assembly when used in the operating modes shown in FIGS. 1A and 1B, respectively.
  • FIG. 3A shows the heat conductivity of the blood over time, in the mode of operation illustrated in FIG. 1A, where the blood is in a liquid form at time T0, with relatively high heat conductivity, where the heat conductivity decreases gradually over time as the blood forms a clot at time TH.
  • FIG. 3B shows the heat conductivity of the blood over time, in the mode of operation illustrated in FIG. 1B, where the blood is heated to accelerate clotting. As seen in FIG. 3B, the heat conductivity begins at time T0 in a liquid form with relatively high heat conductivity, which decreases rapidly as the blood is heated and the clotting occurs at an accelerated rate. FIG. 3B also shows the heat conductivity curve over time shown in FIG. 3A, which clearly illustrates the accelerated hemostasis described in reference to FIG. 1B hereinabove, where THA is the accelerated hemostasis time and TH is the non-accelerated hemostasis time.
  • It will be appreciated by persons skilled in the art that the present invention is not limited by what has been particularly shown and described hereinabove. Rather the scope of the present invention includes both combinations and subcombinations of the various features described hereinabove as well as variations and modifications which would occur to persons skilled in the art upon reading the specification and which are not in the prior art.

Claims (11)

1. A method for monitoring the progress of hemostasis of an artery having a puncture after arterial catheterization, said catheterization using a catheter introducer, the method comprising the steps of:
inserting into an artery a catheter introducer prior to arterial catheterization;
following arterial catheterization, introducing a hemostasis device into said catheter introducer, such that a forward end of said hemostasis device lies exterior of the artery adjacent a puncture in a wall of the artery;
during hemostasis, measuring the heat conductivity of blood in the vicinity of said puncture, thereby to provide an output indication of the progress of hemostasis; and
following hemostasis, removing said catheter introducer and said hemostasis device from the patient.
2. A method for monitoring the progress of hemostasis according to claim 1 and also comprising inflating a balloon attached to said catheter introducer to block said puncture, prior to said introducing a hemostasis device.
3. A method for monitoring the progress of hemostasis according to claim 2 and wherein said removing said catheter introducer also comprises deflating said balloon prior to removing said catheter introducer.
4. A method for accelerating hemostasis of an artery having a puncture after arterial catheterization, said catheterization using a catheter introducer, the method comprising the steps of:
inserting into an artery a catheter introducer prior to arterial catheterization;
following arterial catheterization, introducing a hemostasis device into said catheter introducer, such that a forward end of said hemostasis device lies exterior of the artery adjacent a puncture in a wall of the artery;
accelerating hemostasis by heating blood in the vicinity of said puncture, thereby shortening the time required for hemostasis; and
following hemostasis, removing said catheter introducer and hemostasis device from the patient.
5. A method for accelerating hemostasis of an artery according to claim 4 and also comprising inflating a balloon attached to said catheter introducer to block said puncture, prior to said introducing a hemostasis device.
6. A method for accelerating hemostasis of an artery according to claim 5 and wherein said removing said catheter introducer also comprises deflating said balloon prior to removing said catheter introducer.
7. A method according to claim 4 and also comprising measuring the heat conductivity of blood in the vicinity of said puncture during hemostasis, thereby to provide an output indication of the progress of hemostasis.
8. A hemostasis device comprising:
a resistance element, disposed at a forward end of said hemostasis device;
a resistance sensor; and
a resistance indicator, operative to provide an indication of the resistance at said resistance sensor.
9. A hemostasis device according to claim 8 and also comprising a power supply serially connected to said resistance element, said resistance sensor and said resistance indicator.
10. A hemostasis device according to claim 9 and wherein said power supply is operative to supply a high level current to said resistance element.
11. A hemostasis device according to claim 9 and wherein said power supply is operative to supply a low level current to said resistance sensor.
US11/471,537 2003-02-04 2006-06-21 Methods and apparatus for hemostasis following arterial catheterization Abandoned US20060235376A1 (en)

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