Daisy chainable sensors and stimulators for implantation in living tissue

  • US 5,999,848 A
  • Filed: 09/12/1997
  • Issued: 12/07/1999
  • Est. Priority Date: 09/12/1997
  • Status: Expired due to Term
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First Claim
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1. An implantable sensor/stimulator comprising:

  • a carrier having first and second pads thereon;

    first and second line conductors;

    wherein said first and second line conductors attached to said first and second carrier pads, respectively;

    a rectifier circuit carried by said carrier and connected to the first and second pads;

    said rectifier circuit including means for generatingy an operating voltage from biphasic pulses applied across said first and second pads;

    a line interface circuit carried by said carrier and connected to the first and second pads, said line interface circuit includingdetecting means for serially detecting whether the biphasic pulses applied across said first and second pads are a first phase or a second phase, a first phase corresponding to a received data bit representing a binary "1", and a second phase corresponding to a received data bit representing a binary "0", whereby an input data stream is received by the line interface circuit from biphasic data pulses applied between the first and second line conductors, and hence, between the first and second pads attached to the first and second line conductors, and transmission means for serially applying a monophasic pulse having a first or second amplitude across said first and second pads at a time in-between when the biphasic pulses are applied across the first and second pads, a first amplitude of the monophasic pulse representing a binary "1", and a second amplitude of the monophasic pulse representing a binary "0", whereby an output data stream may be transmitted by the line interface circuit onto the first and second pads, and hence, onto the first and second line conductors attached to the first and second pads;

    a sensor carried by said carrier, said sensor having means for sensing a specified parameter or substance and means for generating an analog output signal that varies as a function of how much of the specified parameter or substance is sensed;

    a converter circuit carried by said carrier that converts the analog output signal from said sensor to a digital sensor signal comprised of a multiplicity of respective bits;

    state machine means carried by said carrier for defining address data corresponding to said implantable sensor/stimulator, and for receiving detected data from the detection means and determining if said detected data corresponds to the defined address data of said implantable sensor/stimulator, and if so, responding thereto by applying the digital sensor signal to the transmission means of the line interface circuit, wherein the respective bits of the digital sensor signal function as the output data stream that is transmitted by the line interface circuit onto the first and second pads, and hence, onto the first and second line conductors attached to the first and second pads; and

    means for hermetically sealing said rectifier circuit, line interface circuit, converter circuit, and state machine means.

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