×

Medical field detector and telemetry unit for implants

  • US 5,545,187 A
  • Filed: 02/21/1995
  • Issued: 08/13/1996
  • Est. Priority Date: 02/23/1994
  • Status: Expired due to Fees
First Claim
Patent Images

1. A combination magnetic field detector and threshold unit for use in a medical implant, comprising:

  • a telemetry circuit connected to a voltage source;

    control logic which generates control signals respectively for telemetry and magnetic field detection;

    a coil unit including a plurality of coil unit parts;

    switch means, controlled by said control logic for, when said control logic generates a control signal for telemetry, electrically connecting said coil unit into said telemetry circuit for forming means for receiving and transmitting telemetry signals and for, when said control logic generates a control signal for magnetic field detection, electrically connecting said coil unit parts for forming a primary side and a secondary side of a pulse transformer which generates an output signal having a characteristic which varies dependent on the presence of a magnetic field; and

    magnetic field indicator means, connected to said secondary side of said pulse transformer, for generating a signal indicating the presence of a magnetic field when said characteristic satisfies a predetermined condition.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×