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Method for applying a multiphasic waveform    
United States Patent5601612   
Link to this pagehttp://www.wikipatents.com/5601612.html
Inventor(s)Gliner; Bradford E. (Bellevue, WA); Lyster; Thomas D. (Bothell, WA); Cole; Clinton S. (Kirkland, WA); Powers; Daniel J. (Bainbridge Island, WA); Morgan; Carlton B. (Bainbridge Island, WA)
AbstractThis invention provides an external defibrillator and defibrillation method that automatically compensates for patient-to-patient impedance differences in the delivery of electrotherapeutic pulses for defibrillation and cardioversion. In a preferred embodiment, the defibrillator has an energy source that may be discharged through electrodes on the patient to provide a biphasic voltage or current pulse. In one aspect of the invention, the first and second phase duration and initial first phase amplitude are predetermined values. In a second aspect of the invention, the duration of the first phase of the pulse may be extended if the amplitude of the first phase of the pulse fails to fall to a threshold value by the end of the predetermined first phase duration, as might occur with a high impedance patient. In a third aspect of the invention, the first phase ends when the first phase amplitude drops below a threshold value or when the first phase duration reaches a threshold time value, whichever comes first, as might occur with a low to average impedance patient. This method and apparatus of altering the delivered biphasic pulse thereby compensates for patient impedance differences by changing the nature of the delivered electrotherapeutic pulse, resulting in a smaller, more efficient and less expensive defibrillator.
   














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Drawing from US Patent 5601612
Method for applying a multiphasic waveform - US Patent 5601612 Drawing
Method for applying a multiphasic waveform
Inventor     Gliner; Bradford E. (Bellevue, WA); Lyster; Thomas D. (Bothell, WA); Cole; Clinton S. (Kirkland, WA); Powers; Daniel J. (Bainbridge Island, WA); Morgan; Carlton B. (Bainbridge Island, WA)
Owner/Assignee     Heartstream, Inc. (Seattle, WA)
Patent assignment
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Publication Date     February 11, 1997
Application Number     08/601,234
PAIR File History     Application Data   Transaction History
Image File Wrapper   Patent Term   Fees
Litigation
Filing Date     February 14, 1996
US Classification     607/7 607/5 607/6 607/74
Int'l Classification     A61N 001/39
Examiner     Kamm; William E.
Assistant Examiner     Schaetzle; Kennedy J.
Attorney/Law Firm     Morrison & Foerster
Address
Parent Case     This application is a divisional of application Ser. No. 08/103,837 filed Aug. 06, 1993.
Priority Data    
USPTO Field of Search     607/5 607/6 607/7 607/2 607/4 607/62 607/74
Patent Tags     applying multiphasic waveform
   
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What is claimed is:

1. A method for applying electrotherapy to a patient through electrodes connected to an energy source, the method comprising the following steps:

discharging the energy source across the electrodes to deliver electrical energy to the patient in a multiphasic waveform;

monitoring a patient-dependent electrical parameter during the discharging step;

adjusting a discharge parameter of a later phase of the multiphasic waveform as a function of a value of the electrical parameter during an earlier phase.

2. The method of claim 1 further comprising discharging the energy source across the electrodes in the earlier phase until the end of a predetermined time period and until the electrical parameter reaches a predetermined value.

3. The method of claim 1 wherein the electrical parameter is energy source voltage.

4. The method of claim 1 wherein the electrical parameter is energy source current.

5. The method of claim 1 wherein the waveform comprises a truncated exponential biphasic waveform.
 Description Submit all comments and votes
 


BACKGROUND OF THE INVENTION

This invention relates generally to an electrotherapy method and apparatus for delivering a shock to a patient's heart. In particular, this invention relates to a method and apparatus for using an external defibrillator to deliver a biphasic defibrillation shock to a patient's heart through electrodes attached to the patient.

Defibrillators apply pulses of electricity to a patient's heart to convert ventricular arrhythmias, such as ventricular fibrillation and ventricular tachycardia, to normal heart rhythms through the processes of defibrillation and cardioversion, respectively. There are two main classifications of defibrillators: external and implanted. Implantable defibrillators are surgically implanted in patients who have a high likelihood of needing electrotherapy in the future. Implanted defibrillators typically monitor the patient's heart activity and automatically supply electrotherapeutic pulses directly to the patient's heart when indicated. Thus, implanted defibrillators permit the patient to function in a somewhat normal fashion away from the watchful eye of medical personnel.

External defibrillators send electrical pulses to the patient's heart through electrodes applied to the patient's torso. External defibrillators are useful in the emergency room, the operating room, emergency medical vehicles or other situations where there may be an unanticipated need to provide electrotherapy to a patient on short notice. The advantage of external defibrillators is that they may be used on a patient as needed, then subsequently moved to be used with another patient. However, because external defibrillators deliver their electrotherapeutic pulses to the patient's heart indirectly (i.e., from the surface of the patient's skin rather than directly to the heart), they must operate at higher energies, voltages and/or currents than implanted defibrillators. The high energy, voltage and current requirements have made current external defibrillators large, heavy a