Implantable medical device having means for suppressing thermall

Details Implantable medical device having means for suppressing thermall Implantable medical device having means for suppressing thermall

1995-02-06

1996-04-23

Kamm, William E.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

A61N 1365

Patent

active

055099262

ABSTRACT:
A pyroelectric suppressor circuit for preventing undesirable thermally induced signals generated by a piezoelectric physical activity sensor from reaching processor circuitry within an implantable medical device is provided. The thermally induced signals typically have frequencies below a frequency in the range from about 0.1 mHz to about 10 mHz. The suppressor circuit provides a high-pass filter that rejects signals that have frequencies associated with thermally induced signals. Signals having frequencies greater than a frequency in the range from about 0.1 mHz to about 10 mHz, which correspond to patient activity, are passed on to processing circuitry of the implantable medical device.

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Piezo Electric Products, Inc., "Piezoceramic Design Notes," Sensors, Mar. 1984.
H. Sandler, T. Fryer and R. Westbrook, "Miniature Implantable Accelerometers.".

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