Implantable cardiac defibrillator employing bipolar sensing...

Details Implantable cardiac defibrillator employing bipolar sensing... Implantable cardiac defibrillator employing bipolar sensing...

A - Human Necessities

61

N

326/1.6

A61N 1/05 (2006.01) A61B 7/00 (2006.01) A61N 1/37 (2006.01) A61N 1/39 (2006.01)

Patent

CA 1223643

IMPLANTABLE CARDIAC DEFIBRILLATOR EMPLOYING BIPOLAR SENSING AND TELEMETRY MEANS Abstract An implantable cardioversion system employing a bipolar electrode for R-wave sensing, the system utilizing heart rate averaging and probability density function techniques in determining whether or not the heart of a patient is to be automatically cardioverted. An improved bipolar electrode facilitates acquisition of a highly accurate R-wave. The implantable system is further provided with the capabilities of (1) providing, upon magnet-type interrogation, an audible indication of proper placement of the bipolar electrode in the body of a patient, (2) providing an audible indication to verify the status of the implanted device (activated or deactivated), (3) the capability of providing, upon request, a transmitted signal modulated with stored information corresponding to the number of times cardio- version of the patient has taken place, (4) the cap- ability of preventing external cardioversion shock from being shunted across the electrodes, and (5) the capability of detecting average heart rate.

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