Minimizing interference between charging and telemetry coils in an implantable medical device
First Claim
1. An implantable medical device, comprising:
- a case;
a charging coil within the case configured to wirelessly receive power, wherein the charging coil is wound in a first plane around a first area; and
a telemetry coil within the case configured to wirelessly receive data, or wirelessly transmit data, or wirelessly receive and transmit data, wherein the telemetry coil is wound in a second plane around a second area,wherein the first and second planes are parallel, and wherein the second area of the telemetry coil at least overlaps the first area of the charging coil, andwherein the second area is smaller than the first area.
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Accused Products
Abstract
An improved implantable pulse generator (IPG) containing improved telemetry circuitry is disclosed. The IPG includes charging and telemetry coils within the IPG case, which increases their mutual inductance and potential to interfere with each other; particularly problematic is interference to the telemetry coil caused by the charging coil. To combat this, improved telemetry circuitry includes decoupling circuitry for decoupling the charging coil during periods of telemetry between the IPG and an external controller. Such decoupling circuitry can comprise use of pre-existing LSK circuitry during telemetry, or new discrete circuitry dedicated to decoupling. The decoupling circuitry is designed to prevent or at least reduce induced current flowing through the charging coil during data telemetry. The decoupling circuitry can be controlled by the microcontroller in the IPG, or can automatically decouple the charging coil at appropriate times to mitigate an induced current without instruction from the microcontroller.
51 Citations
13 Claims
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1. An implantable medical device, comprising:
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a case; a charging coil within the case configured to wirelessly receive power, wherein the charging coil is wound in a first plane around a first area; and a telemetry coil within the case configured to wirelessly receive data, or wirelessly transmit data, or wirelessly receive and transmit data, wherein the telemetry coil is wound in a second plane around a second area, wherein the first and second planes are parallel, and wherein the second area of the telemetry coil at least overlaps the first area of the charging coil, and wherein the second area is smaller than the first area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification