Telectronics Pacing Systems, Inc.

Telectronics N.v.

Geoffrey A Drane

Christopher Newton Daly

Anthony C Stephens

Philip J Maker

Steven M Maas

Steven M Weiss

Richard Grevis

Lorain K Holley

Andrew Sands

Andrew Parle

Lorraine Holley

Rodney Parkin

Norma L Gilli

Paul Dyson

An implantable medical device and method for providing therapy to a patient's inadequately functioning heart are disclosed. The device and method utilize a defibrillation electrode lead system to deliver defibrillation therapy to the patient's heart, and a defibrillator to provide the defibrillation therapy that is delivered by the defibrillation electrode lead system. The defibrillator includes a charge storing circuit for storing an electrical charge therein. Controls are employed for charging the charge storing circuit to an appropriately high energy level for use in defibrillation therapy, in response to a detected tachycardia condition, and for charging the charge storing circuit to an appropriately low energy level for selectively inducing an arrhythmia in the patient's heart. Switching circuitry is utilized to couple the charge storing circuit to the defibrillation electrode lead system; and, controls are provided for selectively actuating the switching circuitry to generate a plurality of micro-shocks from the low energy electrical charge in the charge storing circuit and to deliver the micro-shocks to the defibrillation electrode lead system.

Apparatus and method for arrhythmia induction in arrhythmia control

A multiprogrammable, telemetric, implantable defibrillator contains a high energy shock system to revert VT/VF's to normal sinus rhythm and a multi-programmable VVI bradycardia support system. When the apparatus is in an automatic shock sequence, there are two points of reconfirmation: at the programmed minimum time to shock and after the full charge has been reached, or at thirty seconds, whichever comes first. Reconfirmation involves testing the tachycardia detection output (TDO). If the TDO is high, reconfirmation occurs. If the TDO is low, reconfirmation will not occur and the device will subsequently dump the discharge. Two reconfirmations must occur before a shock is delivered to the patient. If the TDO is low at either reconfirmation, the charge will be dumped.

Reconfirmation prior to shock for implantable defibrillation

An arrhythmia control system and method having automatic determination of the tachycardia confirmation interval. The interval is dynamically set at the minimum of an absolute detection interval and a value calculated as a function of either average sinus interval or tachycardia cycle length or both. The continued presence or the reversion of a pathologic tachycardia can be reliably confirmed, particularly when the patient experiences an elevated heart rate due to, for example, exercise, prior to onset of the tachycardia.

Apparatus and method for detecting and treating cardiac tachyarrhythmias

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Annandale, Australia

Geoffrey A Drane