WO2006015347A2 - Method and apparatus for determining battery capacity in a defibrillator - Google Patents
Method and apparatus for determining battery capacity in a defibrillator Download PDFInfo
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- WO2006015347A2 WO2006015347A2 PCT/US2005/027340 US2005027340W WO2006015347A2 WO 2006015347 A2 WO2006015347 A2 WO 2006015347A2 US 2005027340 W US2005027340 W US 2005027340W WO 2006015347 A2 WO2006015347 A2 WO 2006015347A2
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- battery
- defibrillator
- data
- voltage
- user
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/38—Applying electric currents by contact electrodes alternating or intermittent currents for producing shock effects
- A61N1/39—Heart defibrillators
- A61N1/3975—Power supply
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
- A61B17/1613—Component parts
- A61B17/1626—Control means; Display units
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
- A61B17/1613—Component parts
- A61B17/1631—Special drive shafts, e.g. flexible shafts
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/32—Surgical cutting instruments
- A61B17/320016—Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes
- A61B17/32002—Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes with continuously rotating, oscillating or reciprocating cutting instruments
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/38—Applying electric currents by contact electrodes alternating or intermittent currents for producing shock effects
- A61N1/39—Heart defibrillators
- A61N1/3925—Monitoring; Protecting
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/374—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with means for correcting the measurement for temperature or ageing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/00234—Surgical instruments, devices or methods, e.g. tourniquets for minimally invasive surgery
- A61B2017/00292—Surgical instruments, devices or methods, e.g. tourniquets for minimally invasive surgery mounted on or guided by flexible, e.g. catheter-like, means
- A61B2017/003—Steerable
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00477—Coupling
- A61B2017/00482—Coupling with a code
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/32—Surgical cutting instruments
- A61B17/320016—Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes
- A61B17/32002—Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes with continuously rotating, oscillating or reciprocating cutting instruments
- A61B2017/320032—Details of the rotating or oscillating shaft, e.g. using a flexible shaft
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
- A61B90/08—Accessories or related features not otherwise provided for
- A61B2090/0803—Counting the number of times an instrument is used
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/10—The network having a local or delimited stationary reach
- H02J2310/20—The network being internal to a load
- H02J2310/23—The load being a medical device, a medical implant, or a life supporting device
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates generally to the measurement of battery capacity. More particularly, the present invention relates to the measurement and determination of the remaining capacity of a battery or battery pack in a defibrillator system.
- SCA sudden cardiac arrest
- Sudden cardiac arrest is the onset of an abnormal heart rhythm, lack of pulse and absence of breath, leading to a loss of consciousness. If a pulse is not restored within a few minutes, death occurs. Most often, SCA is due to ventricular fibrillation, a chaotic heart rhythm that causes an uncoordinated quivering of the heart muscle. The lack of coordinated heart muscle contractions results in insufficient blood flow to the brain and other organs. Unless this chaotic rhythm is terminated, allowing the heart to restore its own normal rhythm and thus normal blood flow to the brain and other organs, death ensues.
- Rapid defibrillation is the only known means to restore the normal heart rhythm and prevent death after SCA due to ventricular fibrillation. For each minute that passes after the onset of SCA, the mortality rate increases by 10%. If defibrillated within 1-2 minutes, a patient's survival rate can be as high as 90% or more. At 7-10 minutes, the patient's survival rate drops below 10%. Therefore, the only way to increase the survival chances for an SCA victim is through early defibrillation.
- AEDs Automatic External Defibrillators
- SCA System-to-use Automatic External Defibrillators
- AEDs must be inexpensive, so that they can be broadly deployed.
- AEDs require a portable energy source to enable the device to be deployed quickly to treat a victim of SCA. Often, the victim may be in a remote or difficult-to-reach area, making compact and portable AEDs attractive to police, EMT, Search-And- Rescue and other rescue or emergency services.
- AEDs must remain in a standby mode for extended periods of time. Most current AEDs are rated for two years of standby and must be able to complete a sufficient number of shocks at the end of this period. However, during this two-year standby period, the battery pack may discharge significantly and thus may not have sufficient capacity to provide therapy, especially in situations which may require many defibrillation shocks and an extended period of monitoring time.
- a battery monitoring circuit also known as a "smart battery” to provide a "fuel gauge” for remaining capacity. This technique requires the use of low power analog and digital circuitry within the battery pack or the device to constantly monitor battery capacity. Most of these devices also monitor battery temperature in order to accurately gauge capacity.
- the disadvantage of this technique is that the additional circuitry, components and connections needed to monitor battery capacity may add significant cost to the battery pack and/or the AED itself. As is well known to those skilled in the art, this technique has been historically problematic and has been an issue with portable AEDs that use either disposable or rechargeable battery packs.
- the present invention addresses the deficiencies described above by providing a novel method and apparatus for determining the capacity of a battery and/or a number of battery cells contained in a battery pack.
- the defibrillation system contains a battery or battery pack, a circuit to charge the defibrillation capacitor or capacitors, and a circuit to deliver a biphasic waveform.
- the defibrillation system contains an LCD display and voice playback circuitry, an audio amplifier and a speaker to notify the user of events during device operation.
- the defibrillation system contains a microprocessor and circuitry that measures the battery terminal or battery pack terminal voltage, digitizes the signal and stores the data in local memory for analysis.
- the defibrillation system stores the battery data in flash memory for post-incident analysis.
- the defibrillation system applies filtering techniques before and/or after storing the measured battery voltage signal data.
- the defibrillation system uses an algorithm to determine the remaining capacity of the battery or battery pack.
- the defibrillation system stores in memory the measured battery terminal or battery pack terminal voltage and its associated operational mode.
- the different operating modes draw various levels of current from the battery or battery pack.
- the algorithm then uses this stored data to determine the remaining capacity of the battery or battery pack.
- the defibrillation system stores in memory how long the device has been used. The algorithm then uses this stored data to determine the remaining capacity of the battery or battery pack.
- the defibrillation system stores in memory the measured battery terminal or battery pack terminal voltage and how long the device has been used. The algorithm then uses this stored data to determine the remaining capacity of the battery or battery pack.
- the defibrillation system stores in memory the measured battery terminal or battery pack terminal voltage and how many times the device has been used with its installed battery or battery pack. The algorithm then uses this stored data to determine the remaining capacity of the battery or battery pack.
- the defibrillation system stores in memory the measured battery terminal or battery pack terminal voltage and how many times the device has been used to charge its internal capacitors with its installed battery or battery pack. The algorithm then uses this stored data to determine the remaining capacity of the battery or battery pack.
- the defibrillation system stores in memory how many times the device has been used to deliver a biphasic shock to a patient with its installed battery or battery pack. The algorithm then uses this stored data to determine the remaining capacity of the battery or battery pack. In another aspect of the present invention, the defibrillation system stores in memory the measured battery terminal or battery pack terminal voltage and how many times the device has been used to deliver a biphasic shock to a patient with its installed battery or battery pack. The algorithm then uses this stored data to determine the remaining capacity of the battery or battery pack.
- the algorithm uses the stored data to determine the remaining capacity of the battery or battery pack and informs the user audibly and/or visually that the battery or battery pack is low. In another aspect the present invention, the algorithm uses the stored data to determine the remaining capacity of the battery or battery pack and informs the user that the battery or battery pack needs to be replaced.
- the algorithm uses the data to determine the remaining capacity of the battery or battery pack and informs the user of the number of shocks left. In another aspect the present invention, the algorithm uses the data to determine the remaining capacity of the battery or battery pack and informs the user of the remaining monitor time.
- the algorithm uses the data to determine the remaining capacity of the battery or battery pack and informs the user of the general battery capacity as it relates to typical use, as for example, by displaying a "fuel gauge".
- a method for determining the remaining battery capacity of a battery in a defibrillator comprising: applying an algorithm that calculates remaining battery capacity of a battery using measured battery voltage value in conjunction with historical information previously stored in the defibrillator.
- a defibrillator comprising: at least one battery; at least one capacitor; a circuit to charge the at least one capacitor from the at least one battery; a circuit to deliver a biphasic waveform from the at least one capacitor to the patient; user notification apparatus for notifying the user of events during defibrillator operation; and a data acquisition circuit that measures the terminal voltage of the at least one battery, digitizes the signal and stores the data in memory for analysis.
- a method for determining battery capacity in a defibrillator comprising: recording historical data comprising at least one from the group consisting of: how long it has been since the battery was last charged; how the defibrillator has been used since the battery was last charged, including a record of when the defibrillator was in idle mode and when the defibrillator was in shocking mode; how many shocks have been delivered since the battery was last recharged; how long has it been since the defibrillator was last used in shocking mode; and how many times the battery has been recharged over its lifetime; measuring the current battery voltage; and applying an algorithm to calculate remaining battery capacity, using the measured battery voltage and the recorded historical data.
- apparatus for determining the battery capacity in a defibrillator comprising: apparatus for recording historical data comprising at least one from the group consisting of: how long it has been since the battery was last charged; how the defibrillator has been used since the battery was last charged, including a record of when the defibrillator was in idle mode and when the defibrillator was in shocking mode; how many shocks have been delivered since the battery was last recharged; how long has it been since the defibrillator was last used in shocking mode; and how many times the battery has been recharged over its lifetime; apparatus for measuring the current battery voltage; and apparatus for applying an algorithm to calculate remaining battery capacity, using the measured battery voltage and the recorded historical data.
- Fig. 1 is an illustration of a battery pack containing battery cells
- Fig. 2 shows how the battery pack is inserted into the defibrillator
- Fig. 3 is a schematic drawing showing the cell arrangement of the battery pack
- Fig. 4 is block diagram of the defibrillator components
- Fig. 5 is a profile of a new battery pack run in the defibrillator for a number of continuous shock cycles, wherein two voltages, i.e., the minimum voltage during charging (Vchg(min)) and the recovered voltage in between shocks (Vrecover) , are measured;
- Fig. 6 is a profile of a used battery pack run in the defibrillator for a number of continuous shock cycles, wherein two voltages, i.e., the minimum voltage during charging (Vchg(min)) and the recovered voltage in between shocks (Vrecover) , are measured;
- Fig. 7 is a profile of a depleted battery pack run in the defibrillator for a number of continuous shock cycles, wherein two voltages, i.e., the minimum voltage during charging (Vchg(min)) and the recovered voltage in between shocks (Vrecover) , are measured;
- Fig. 8 is an oscilloscope display showing the battery voltage drop during a defibrillator charge cycle.
- Fig. 9 is a flow diagram showing a preferred algorithm for determining battery capacity.
- the present invention discloses a system and method for determining the remaining capacity in the battery pack of a defibrillator.
- Figs. 1 and 2 there is shown the battery pack 5 of a defibrillator 15. It should be appreciated that the present invention may be applied the entire battery pack 15 or to individual cells of the battery pack.
- Fig. 5 is the profile of a new battery pack measured while the defibrillator is running in AED mode for a number of continuous shock cycles. AED mode is defined as three shocks per minute followed by one minute of rest.
- the battery profile in Fig. 5 shows two voltage measurements.
- the first measured voltage, Vchg(min) 80 is the minimum voltage reached during the charge cycle (i.e., while the defibrillator is delivering shocks) .
- the second measured voltage, (Vrecover) 85 is the battery voltage present when the battery has recovered after a charging cycle (i.e., while the battery is "resting" between shocks) .
- Vchg(min) 80 is the minimum voltage reached during the charge cycle (i.e., while the defibrillator is delivering shocks) .
- the second measured voltage, (Vrecover) 85 is the battery voltage present when the battery has recovered after a charging cycle (i.e., while the battery is "resting" between shocks) .
- the measured Vchg(min) 80 is relatively flat with a slight increase in voltage over the first thirty shocks, followed by a slight decrease in approximately the last twelve shocks before the voltage decreases sharply after the last shock (approximately shock number 43 in Fig. 5) .
- This decrease is due, to a rise in cell temperature as the defibrillator is delivering shocks.
- the measured Vrecover 85 shows little indication that the battery is depleting at any point measured.
- Fig. 6 shows the profile of a used battery pack, also measured while the battery pack is run in a defibrillator for a number of continuous shock cycles.
- the two voltages measured (Vchg(min) 80 and Vrecover 85) exhibit characteristics similar to that of a new battery, with the exception that Vchg(min) 80 has a lower baseline voltage and the used battery pack has a smaller shock capacity than the new battery pack.
- Fig. 7 shows the profile of a depleted battery pack. While the depleted battery pack is capable of delivering several shocks, both voltages (Vchg(min) 80 and Vrecover 85) are gradually decreasing. The depleted battery pack has a much lower shock capacity than both the new and used battery packs (Figs. 5 and 6, respectively) . It should be appreciated that the depleted battery in this case should not be confused with a deeply discharged battery. A deeply discharged battery is unable to sustain a voltage even under a nominal load.
- a depleted battery pack does not provide the defibrillator with a reliable source of power. Yet, it is critical in life saving situations that the device reliably notify the user that the battery is low.
- Many current AED units use a battery monitoring circuit, also known as a "smart battery", to provide a "fuel gauge” for remaining battery capacity.
- This technique requires the use of low power analog and digital circuitry within the battery pack, or within the device, to constantly monitor battery capacity. Many current devices also monitor battery cell temperature to accurately gauge capacity.
- the disadvantage of this technique is that the additional circuitry, components and connections which are needed for battery monitoring add significant cost to the battery pack and/or the AED unit itself. Therefore, this "fuel gauge” technique has been historically problematic and has been an issue with portable AEDs with both disposable and rechargeable battery packs.
- the AED of the present invention uses a data acquisition system that measures the current battery voltage and stores the data, along with historical information, for analysis, thereby eliminating the need for using additional circuitry, components and connections.
- Battery pack 5 of the defibrillator 15.
- Battery pack 5 preferably comprises Lithium Manganese Dioxide type cells, however, the method and apparatus of the present invention may be applied to other cell chemistries as well including, but not limited to, Alkaline Manganese Dioxide or rechargeable types, Nickel-Metal Hydride types or Lithium Ion types, etc.
- a preferred embodiment of the battery pack uses five battery cells, however, the battery pack may easily implement a different number of battery cells. The voltage of each of the five single battery cells is 3V, therefore, the defibrillator supply voltage is 15V.
- the present invention could also be utilized with more or less battery cells and/or other supply voltages.
- Battery pack 5 preferably placed in a plastic housing, is inserted into defibrillator 15 as shown in Fig. 2.
- FIG. 3 A schematic of the five-cell arrangement 20, comprising five individual cells 10, each with a supply voltage of 3V, is shown in Fig. 3.
- Defibrillator 15 contains a data acquisition system including, but not limited to, microprocessor 25, programmable logic device (PLD) 30, memory (not shown) and analog-to-digital converter 40.
- the preferred embodiment of the invention uses microprocessor 25 to execute instructions to (i) sample data, (ii) store the data into memory, and (iii) process the data to determine the remaining battery capacity.
- programmable logic device 30 controls the interface to analog-to- digital converter 40 and stores the sampled data into a local memory buffer. Programmable logic device 30 then interrupts microprocessor 25 to sample the data contained in the buffer, via data-bus 45 connected between microprocessor 25 and PLD 30.
- Microprocessor 25 may also directly interface to analog-to-digital converter 40 and use internal timing to interrupt microprocessor 25 for sampling frequency. Additionally, microprocessor 25 may be a microcontroller and have memory, analog-to-digital converter 40 and other peripherals on a single chip.
- the defibrillator also contains LCD screen 50, as well as a voice synthesizer and speaker for instructing the rescuer.
- Defibrillator 15 also contains all the necessary components for defibrillation including, but not limited to, charger circuit 60, battery pack 10, capacitors 65 and an H-bridge circuit 70.
- the defibrillator data acquisition system samples the battery voltage once every 45 mS (22.22Hz) and stores the data into random access memory (RAM) .
- the data acquisition system may also store the battery data onto a removable multi-media flash card for post-incident review.
- Defibrillator 15 is also capable of storing the battery data into EEPROM, Flash or other types of memory well known in the art.
- Defibrillator 15 does not need to implement a digital filter, however, a digital filter, such as, but not limited to, an averaging filter (smoothing filter) , low-pass filter or other filters well known in the art, may easily be implemented.
- a digital filter such as, but not limited to, an averaging filter (smoothing filter) , low-pass filter or other filters well known in the art, may easily be implemented.
- Defibrillator 15 may also store historical information into RAM. Such data may contain information about the period of time since the device was last used, the number of times the device has been used, the operational mode of the device and the number of shocks that have been delivered. The device may additionally store its historical information onto a removable multi-media flash card for post-incident review. Defibrillator 15 is also capable of storing its historical information into EEPROM, Flash or other types of memory well known in the art. In one embodiment of the present invention, the method for determining the remaining battery capacity of defibrillator 15 may apply an algorithm that uses battery voltage values in conjunction with the device's historical information.
- Different thresholds for different modes of the defibrillator operation may be used when applying the algorithm to determine the remaining battery capacity of defibrillator 15. As shown in Fig. 8, for example, voltage 100 drops significantly when the defibrillator begins to charge.
- the method of the present invention uses a predetermined threshold for when the defibrillator is in idle mode (monitor mode) and applies an algorithm using multiple thresholds for when the defibrillator is in charge mode (charging the capacitors in preparation to provide a shock) .
- the algorithm takes into account, among other things, how long it has been since the defibrillator was last used, how many times the capacitors have been charged and how many times the defibrillator has delivered a shock.
- the defibrillator uses three predetermined thresholds based, on the number of shocks delivered, to determine the charge remaining in the battery pack.
- the method of the present invention preferably uses a threshold of 7.39 volts for one to three shocks, a threshold of 7.87 volts for three to six shocks, and a threshold of 9.03 volts for more than six shocks.
- the method of the present invention uses a single threshold of 10 volts.
- the algorithm will determine that a battery capacity remaining is capable of, for example, a minimum of six shocks, although in some cases may be able to deliver up to a maximum of twelve shocks.
- the rescuer is notified to replace the ' battery by means of visual and audible messages. It should be appreciated that the method for determining the remaining battery capacity of defibrillator 15 uses delays between modes to allow the battery voltage to recover. As can be seen in Fig. 8, it can take several hundred milliseconds for the battery to recover after charge mode.
- the algorithm used in the method for determining remaining battery capacity also takes into account the total number of shocks delivered.
- the device proceeds to notify the user to replace the battery.
- the defibrillator may use a twenty- shock count threshold.
- the algorithm used in the method of the present invention for determining remaining battery capacity also takes into account the total time the device has been used. When the device has reached a predetermined threshold for the total time of use, the device proceeds to notify the user to replace the battery.
- the defibrillator may use a two-hour time threshold.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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PCT/US2005/027340 WO2006015347A2 (en) | 2004-07-30 | 2005-07-29 | Method and apparatus for determining battery capacity in a defibrillator |
CA002617229A CA2617229A1 (en) | 2004-07-30 | 2005-07-29 | Method and apparatus for determining battery capacity in a defibrillator |
EP05782105A EP1778346A4 (en) | 2004-07-30 | 2005-07-29 | Method and apparatus for determining battery capacity in a defibrillator |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US59277804P | 2004-07-30 | 2004-07-30 | |
US60/592,778 | 2004-07-30 | ||
PCT/US2005/027340 WO2006015347A2 (en) | 2004-07-30 | 2005-07-29 | Method and apparatus for determining battery capacity in a defibrillator |
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WO2006015347A2 true WO2006015347A2 (en) | 2006-02-09 |
WO2006015347A3 WO2006015347A3 (en) | 2006-06-01 |
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PCT/US2005/027340 WO2006015347A2 (en) | 2004-07-30 | 2005-07-29 | Method and apparatus for determining battery capacity in a defibrillator |
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EP (1) | EP1778346A4 (en) |
CA (1) | CA2617229A1 (en) |
WO (1) | WO2006015347A2 (en) |
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WO2011005152A1 (en) * | 2009-07-10 | 2011-01-13 | St. Jude Medical Ab | Battery discharge measurement device and method |
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JP2001522272A (en) * | 1997-04-18 | 2001-11-13 | フィジオ−コントロール・マニュファクチャリング・コーポレーション | Defibrillation removal method and device |
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-
2005
- 2005-07-29 CA CA002617229A patent/CA2617229A1/en not_active Abandoned
- 2005-07-29 WO PCT/US2005/027340 patent/WO2006015347A2/en active Application Filing
- 2005-07-29 EP EP05782105A patent/EP1778346A4/en not_active Withdrawn
Non-Patent Citations (1)
Title |
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See references of EP1778346A4 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011005152A1 (en) * | 2009-07-10 | 2011-01-13 | St. Jude Medical Ab | Battery discharge measurement device and method |
Also Published As
Publication number | Publication date |
---|---|
WO2006015347A3 (en) | 2006-06-01 |
EP1778346A4 (en) | 2010-09-29 |
EP1778346A2 (en) | 2007-05-02 |
CA2617229A1 (en) | 2006-02-09 |
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