Low cost implantable medical device

Details Low cost implantable medical device Low cost implantable medical device

1993-06-17

1995-02-21

Kamm, William E.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

607 32, A61N 100

Patent

active

053911881

ABSTRACT:
A low cost, limited-function implantable medical device. The device's synchronous circuits are driven by an ultra-slow master clock signal produced without utilization of a crystal oscillator. The device is non-invasively programmable by means of an externally applied programming magnet, which is detected by a solid state magnetic sensor (MAGFET) circuit in the implanted device. The MAGFET circuit is capable of discriminating between two polarity orientations of the programming magnet, so that one polarity is associated with increasing programmable parameters and the opposite polarity is associated with decreasing programmable parameters. Upon initial placement and detection of the programming magnet, the disclosed device performs a threshold margin test comprising three asynchronous stimulating pulses at the current pulse width and pulse amplitude settings.

REFERENCES:
patent: 4273132 (1981-06-01), Hartlaub
patent: 4476868 (1984-10-01), Thompson
patent: 4651740 (1987-03-01), Schroeppel
patent: 5312446 (1994-05-01), Holschbach
Frank Goodenough, "IC Holds 16 Seconds of Audio Without Power", Electronic Design, Jan. 31, 1991, pp. 39-44.
Information Storage Devices, Inc. ISA 1016 Series Preliminary Specifications, Jan., 1991, 9 pages.
Bill Arnold, "Here comes analog memory", EDN News Edition, Feb. 7, 1991, vol. 36, No. 3A, pp. 1 and 38.

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