US2002161408A1PendingUtilityA1

Damped biphasic energy delivery circuit for a defibrillator

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Assignee: KONINKL PHILIPS ELECTRONICS NVPriority: Apr 22, 1999Filed: Apr 17, 2002Published: Oct 31, 2002
Est. expiryApr 22, 2019(expired)· nominal 20-yr term from priority
Inventors:Thomas D. LysterBradford Evan GlinerDaniel J. Powers
A61N 1/3912A61N 1/3904A61N 1/3937
42
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Claims

Abstract

A defibrillator capable of delivering a damped biphasic truncated (DBT) defibrillation pulse is provided. An energy storage circuit is coupled across a high voltage switch such as an H-bridge for delivering a defibrillation pulse to the patient through a pair of electrodes. A controller operates to control the entire defibrillation process and detects shockable rhythms from the patient via an ECG front end. The energy storage circuit consists of an energy storage capacitor, a series inductor, a shunt diode, and optionally a resistor in series with the inductor. The controller measures as the patient dependent parameter the time interval between the initial delivery of the defibrillation pulse and the occurrence of the peak current or voltage to determine the first and second phases of the defibrillation pulse to provide for compensation for patient impedance. Other types of patient dependent parameters, measured either before or during delivery of the DBT defibrillation pulse, could be alternatively employed to achieve the impedance compensation.

Claims

exact text as granted — not AI-modified
What we claim as our invention is:  
     
         1 . A defibrillator comprising 
 a pair of electrodes for coupling to a patient;    an HV switch coupled to said pair of electrodes; and    an energy storage circuit for delivering a damped biphasic truncated defibrillation pulse through said HV switch to said patient.    
     
     
         2 . A defibrillator according to  claim 1  wherein said energy storage circuit comprises: 
 an energy storage capacitor coupled across said HV switch;  
 a series inductor and a series resistor coupled in series with said energy storage capacitor; and  
 a shunt diode coupled across said series inductor and series resistor.  
 
     
     
         3 . A defibrillator according to  claim 2  wherein said series inductor has an inductance value between 5 and 100 milliHenries.  
     
     
         4 . A defibrillator according to  claim 1  further comprising: 
 an ECG front end coupled to said pair of electrodes to provide ECG information; and  
 a controller coupled to said front end to receive said ECG information, to said HV switch to control a first and second phase duration of said damped biphasic truncated defibrillation pulse, and to said energy storage circuit to receive at least one of a current signal and a voltage signal.  
 
     
     
         5 . A defibrillator according to  claim 4  wherein said controller measures a patient dependent parameter according to said one of said current signal and said voltage signal to determine said first and second phase durations.  
     
     
         6 . A defibrillator according to  claim 5  wherein said patient dependent parameter comprises a time duration between an initiation of said damped biphasic truncated defibrillation pulse and a peak current.  
     
     
         7 . A defibrillator according to  claim 5  wherein said patient dependent parameter comprises a time duration between an initiation of said damped biphasic truncated defibrillation pulse and a peak voltage.  
     
     
         8 . A defibrillator according to  claim 4  wherein said first and second phase durations are determined according to a look up table.  
     
     
         9 . A defibrillator according to  claim 1  wherein said damped biphasic truncated defibrillation pulse has a peak current limited to less than a maximum value.  
     
     
         10 . A method for delivering a damped biphasic truncated defibrillation pulse to a patient, comprising: 
 coupling a defibrillator via pair of electrodes to said patient;    initiating delivery of a first phase of said damped biphasic truncated defibrillation pulse to said patient;    measuring a patient dependent parameter during said delivery of said first phase; and    determining a first and second phase duration of said damped biphasic truncated defibrillation pulse based on said patient dependent parameter.    
     
     
         11 . A method for delivering a damped biphasic truncated defibrillation pulse to a patient according to  claim 10 , said measuring step comprising measuring a time interval to a peak current in said damped biphasic truncated defibrillation pulse.  
     
     
         12 . A method for delivering a damped biphasic truncated defibrillation pulse to a patient according to  claim 10 , said measuring step comprising measuring a time interval to a peak voltage in said damped biphasic truncated defibrillation pulse.  
     
     
         13 . A method for delivering a damped biphasic truncated defibrillation pulse to a patient according to  claim 10  further comprising: 
 truncating said first phase according to said first phase duration; and  
 delivering a second phase of said damped biphasic truncated defibrillation based on said second phase duration.  
 
     
     
         14 . A method for delivering a damped biphasic truncated defibrillation pulse to a patient, comprising: 
 coupling a defibrillator via pair of electrodes to said patient;    measuring a patient dependent parameter of said patient;    determining first and second phase durations of said damped biphasic truncated defibrillation pulse based on said patient parameter; and    delivering said damped biphasic truncated defibrillation pulse to said patient according to said first and second phase durations.    
     
     
         15 . A method for delivering a damped biphasic truncated defibrillation pulse to a patient according to  claim 14 , said measuring step comprising measuring a patient impedance as said patient dependent parameter.  
     
     
         16 . A defibrillator comprising 
 a pair of electrodes for coupling to a patient;    an HV switch coupled to said pair of electrodes;    an energy storage circuit for generating a damped biphasic truncated defibrillation pulse; and    a controller coupled to said HV switch and to said energy storage circuit; 
 wherein said controller initiates delivery of said damped biphasic truncated defibrillation, measures a patient dependent parameter, and determines first and second phase durations of said damped biphasic truncated defibrillation pulse based on said patient dependent parameter.  
   
     
     
         17 . A defibrillator according to  claim 16  wherein said energy storage circuit comprises: 
 an energy storage capacitor coupled across said HV switch;  
 a series inductor and a series resistor coupled in series with said energy storage capacitor; and  
 a shunt diode coupled across said series inductor and series resistor.  
 
     
     
         18 . A defibrillator according to  claim 17  wherein said series inductor has an inductance value between 5 and 100 milliHenries.  
     
     
         19 . A defibrillator according to  claim 16  further comprising an ECG front end coupled to said pair of electrodes to provide ECG information to said controller to detect a shockable rhythm.  
     
     
         20 . A defibrillator according to  claim 16  wherein said controller measures said patient dependent parameter according to a current signal from said energy storage circuit.  
     
     
         21 . A defibrillator according to  claim 20  wherein said patient dependent parameter comprises a time duration between an initiation of said damped biphasic truncated defibrillation pulse and a peak current measured from said current signal.  
     
     
         22 . A defibrillator according to  claim 16  wherein said controller measures said patient dependent parameter according to a voltage signal from said energy storage circuit.  
     
     
         23 . A defibrillator according to  claim 22  wherein said patient dependent parameter comprises a time duration between an initiation of said damped biphasic truncated defibrillation pulse and a peak voltage measured from said voltage signal.  
     
     
         24 . A defibrillator according to  claim 16  wherein said first and second phase durations are determined according to a look up table based on said patient dependent parameter.  
     
     
         25 . A defibrillator according to  claim 16  wherein said damped biphasic truncated defibrillation pulse has a peak current limited to less than a maximum value.

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