VARIABLE ANTENNA MATCHING NETWORK FOR AN IMPLANTABLE ANTENNA
First Claim
Patent Images
1. An apparatus comprising:
- an implantable medical device including;
an implantable telemetry circuit;
an implantable antenna;
a matching circuit, coupled to the antenna;
an impedance detector circuit, coupled between the implantable telemetry circuit and the matching circuit, the impedance detector circuit configured to detect an impedance of at least one of the implantable telemetry circuit or the implantable antenna; and
a control circuit, coupled to the impedance detector circuit and the matching circuit, the control circuit configured to use the detected impedance as a control input to calculate a value for the matching circuit that decreases an impedance difference between the implantable telemetry circuit and the implantable antenna or increases or maximizes a communication power transfer value associated with the implantable medical device.
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Abstract
An implantable medical device can include an implantable antenna for communication with external devices or other internal devices. Changes in the patient'"'"'s body position, weight, composition or other factors may change the efficiency of the implantable antenna and hinder communication. The disclosed circuit can calculate a value for a matching network for an implantable telemetry circuit to decrease an impedance difference between the implantable telemetry circuit and the implantable antenna or increase or maximize a communication power transfer value associated with the implantable medical device.
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Citations
21 Claims
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1. An apparatus comprising:
an implantable medical device including; an implantable telemetry circuit; an implantable antenna; a matching circuit, coupled to the antenna; an impedance detector circuit, coupled between the implantable telemetry circuit and the matching circuit, the impedance detector circuit configured to detect an impedance of at least one of the implantable telemetry circuit or the implantable antenna; and a control circuit, coupled to the impedance detector circuit and the matching circuit, the control circuit configured to use the detected impedance as a control input to calculate a value for the matching circuit that decreases an impedance difference between the implantable telemetry circuit and the implantable antenna or increases or maximizes a communication power transfer value associated with the implantable medical device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method comprising:
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detecting an impedance of at least one of an implantable telemetry circuit or an implantable antenna of an implantable medical device; and using the detected impedance as a control input to calculate a value for the matching circuit that decreases an impedance difference between the implantable telemetry circuit and the implantable antenna or increases or maximizes a communication power transfer value associated with the implantable medical device. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification