Low cost implantable medical device

Details Low cost implantable medical device Low cost implantable medical device

1992-05-01

1994-03-08

Cohen, Lee S.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

A61N 100

Patent

active

052923428

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. After the threshold margin test is performed, each subsequent removal-and-replacement cycle of the programming magnet cause the disclosed device to enter a different programming mode, in which mode a particular operational parameter of the device may be adjusted up or down. Programmable values are retained in the implanted device in the form of analog voltages stored in non-volatile analog memory cells. During operation, the stored analog voltages are applied to voltage-to-current converting circuits to produce signals whose currents control the time-out interval of various multivibrator-type timing circuits.

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Frank Goodenough, "IC Holds 16 Seconds of Audio Without Power", Electronic Design, Jan. 31, 1991, pp. 39-44.
Information Storage Devices, Inc., ISD 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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