Using the case of an implantable medical device to broaden communication bandwidth
First Claim
1. An implantable medical device configured to transmit data to, receive data from, or transmit and receive data to and from, an external device with a first bandwidth, comprising:
- a planar conductive case;
a resonant circuit within the conductive case comprising an antenna with an inductance and a resistance, wherein the antenna is located in a plane parallel to a plane of the conductive case, wherein the inductance and resistance of the antenna prescribe a second bandwidth for the resonant circuit;
wherein the antenna is spaced at a distance to the conductive case to cause coupling between the antenna and the conductive case, whereby the coupling broadens the second bandwidth to a third bandwidth greater than the first bandwidth.
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Accused Products
Abstract
An improved implantable pulse generator (IPG) containing improved telemetry circuitry is disclosed. The IPG includes a telemetry coil within the conductive IPG case, not in the non-conductive header as is typical, which simplifies IPG design. The improved resonant circuit of which the coil is a part does not include a discrete tuning resistor with the coil, which tuning resistor was traditionally used to increase communication bandwidth of the coil to render it suitable for FSK telemetry. In lieu of the tuning resistor, the coil is intentionally inductively coupled to the case by positioning the coil a certain distance away from the case. Such coupling decreases the effective inductance and increases the effective series resistance in the improved resonant circuit, both of which increase the communication bandwidth. As such, suitable FSK telemetry can be achieved, even though the improved resonant circuit without the case would not on its own have suitable bandwidth.
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Citations
26 Claims
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1. An implantable medical device configured to transmit data to, receive data from, or transmit and receive data to and from, an external device with a first bandwidth, comprising:
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a planar conductive case; a resonant circuit within the conductive case comprising an antenna with an inductance and a resistance, wherein the antenna is located in a plane parallel to a plane of the conductive case, wherein the inductance and resistance of the antenna prescribe a second bandwidth for the resonant circuit; wherein the antenna is spaced at a distance to the conductive case to cause coupling between the antenna and the conductive case, whereby the coupling broadens the second bandwidth to a third bandwidth greater than the first bandwidth. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for making an implantable medical device configured to transmit data to, receive data from, or transmit and receive data to and from, an external device with a first bandwidth, the method comprising:
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providing a resonant circuit comprising an antenna with an inductance and a resistance, wherein the resonant circuit has a second bandwidth; and positioning the resonant circuit within a conductive case such that the antenna is spaced at a distance to the conductive case to cause coupling between the antenna and the conductive case, whereby the coupling broadens the second bandwidth of the resonant circuit to a third bandwidth greater than the first bandwidth. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification