Defibrillation apparatus and method

Details Defibrillation apparatus and method Defibrillation apparatus and method

1997-05-09

1998-10-06

Kamm, William E.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

A61N 139

Patent

active

058171320

ABSTRACT:
An implanted defibrillator continuously monitors a patient's heart to detect the presence of fibrillation and repeatedly, automatically computes the approximate entropy of a series of data representing the fibrillating heart at a moment in time. The first approximate entropy score that meets a predetermined relation with respect to a predetermined threshold value activates an energy delivery system to defibrillate the heart with a low level shock. The process continues until defibrillation is successful. An external defibrillator incorporates the approximate entropy algorithm to achieve low level defibrillation. A method is disclosed which times the delivery of a defibrillating shock to a fibrillating heart to coincide with the moment that the defibrillation threshold is at a minimum.

REFERENCES:
patent: 5366487 (1994-11-01), Adams et al.
patent: 5447520 (1995-09-01), Spano et al.
patent: 5471991 (1995-12-01), Shinwar

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