Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1998-01-23
1999-11-02
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
607 9, 607 63, 607 2, 600513, 600547, A61N 1365
Patent
active
059787104
ABSTRACT:
An implantable medical device for electrically stimulating the heart to beat generally includes a processor, a plurality of electrodes, a sense amplifier, a pulse generator, and a heart status monitor. The processor can determine when the patient has entered an environment of high electromagnetic interference. When this occurs, the processor forces the implantable device into a safe noise mode. While in the same noise mode (which preferably continues while the patient is experiencing the electromagnetic interference), the implantable device paces the heart on demand and inhibits pacing during the vulnerable period. The processor determines when the vulnerable period is occurring and when the heart needs to be paced by monitoring a status signal from the heart status monitor. The status signal generated by the heart status monitor preferably is not sensitive to the electromagnetic interference, and thus the processor can determine the bio-mechanical state of the heart during a cardiac cycle even in the face of high electromagnetic interference. The heart status monitor preferably includes an impedance measurement circuit, but may include any type of cardiac sensor that can generate a status signal from which the processor can determine the beginning and ending of the vulnerable period. Accordingly, even during a period of high electromagnetic interference, the implantable device can provide on demand pacing support to the patient.
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George H. Crossley, Lisa A. Kiger, Wesley K. Haisty, Tony W . Simmons, Matt Zmijewski and David M. Fitzgerald; False-Positive Behavior with the dP/dt Sensing Pacemaker: A Rare Complication of Physiological Sensor, pp. 2492-2495; North Carolina and Minneapolis, Minnesota.
Paul Patrick J.
Prutchi David
Kamm William E.
Schaetzle Kennedy J.
Sulzer Intermedics Inc.
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