Medical field detector and telemetry unit for implants
First Claim
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.
1 Assignment
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Accused Products
Abstract
A combined telemetry and magnetic field detector unit for use in a medical implant includes control logic, a magnetic field indicator, a telemetry circuit containing a number of switches, and a coil unit. The control logic is arranged to operate the switches such that switching between the telemetry function and the magnetic field detection function of the combined unit is achieved so the coil unit is utilized for transmission of telemetry signals to and from a programmer as well as for magnetic field detection. For magnetic field detection, the coil unit, which consists of multiple parts, is connected by the control logic such that the parts respectively form a primary side and a secondary side of a pulse transformer, with the magnetic field indicator connected by the control logic to the pulse transformer'"'"'s secondary side.
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Citations
12 Claims
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1. A combination magnetic field detector and threshold unit for use in a medical implant, comprising:
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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 Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification