Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1997-10-17
1999-11-23
Jastrzab, Jeffrey R.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
A61N 1365
Patent
active
059916613
ABSTRACT:
An implantable cardiac stimulation device, such as a pacemaker or an implantable cardioverter-defibrillator, that includes an accelerometer-based activity sensor that processes one or more signals from the activity sensor to obtain parameters that are indicative of the heartbeat of the patient. The implantable cardiac stimulation device determines when the patient is at rest and the activity sensor provides a signal that corresponds to the acceleration of the sensor due to the heartbeat of the patient. This acceleration signal is integrated over time once to provide a contractility parameter, which is indicative of the contractility of the heart and is integrated over time twice to provide a displacement parameter, which is indicative of the displacement of the heart wall during the heartbeat. This displacement parameter is thereby indicative of the volume of blood pumped by the heart. A microprocessor uses either the contractility parameter, the displacement parameter or both to modify the delivery of therapeutic stimulation pulses to the heart.
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Bornzin Gene A.
Bradley Kerry
Florio Joseph J.
Park Euljoon
Jastrzab Jeffrey R.
Pacesetter Inc.
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