VARIABLE ANTENNA MATCHING NETWORK FOR AN IMPLANTABLE ANTENNA
First Claim
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1. An apparatus comprising:
- an implantable medical device including;
an implantable transceiver;
an implantable antenna, wherein an effective impedance of the antenna is variable dependent upon at least one of whether the antenna is implanted into a subject, a location at which the antenna is implanted into the subject, a body composition, and a body shape of the subject;
a matching circuit, coupled to the antenna;
an impedance mismatch detector circuit, coupled between the transceiver and the matching circuit, the impedance mismatch detector circuit configured to detect an indication of an impedance mismatch between an implantable transceiver in an implantable medical device and an implantable antenna; and
a control circuit, coupled to the impedance mismatch detector circuit and the matching circuit, the control circuit configured to use the indication of the impedance mismatch as a control input to adjust the matching circuit in a manner that decreases the impedance mismatch and increases or maximizes a communication power transfer value associated with the implantable medical device.
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Abstract
An implantable medical device may have an 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 antenna efficiency and hinder communication. The disclosed circuit may automatically adjust a matching network for an implanted transceiver to dynamically maximize transmission and reception by controlling the selected value of a plurality of capacitors, inductors and resistors.
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Citations
23 Claims
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1. An apparatus comprising:
an implantable medical device including; an implantable transceiver; an implantable antenna, wherein an effective impedance of the antenna is variable dependent upon at least one of whether the antenna is implanted into a subject, a location at which the antenna is implanted into the subject, a body composition, and a body shape of the subject; a matching circuit, coupled to the antenna; an impedance mismatch detector circuit, coupled between the transceiver and the matching circuit, the impedance mismatch detector circuit configured to detect an indication of an impedance mismatch between an implantable transceiver in an implantable medical device and an implantable antenna; and a control circuit, coupled to the impedance mismatch detector circuit and the matching circuit, the control circuit configured to use the indication of the impedance mismatch as a control input to adjust the matching circuit in a manner that decreases the impedance mismatch and 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)
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12. An apparatus comprising:
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means for detecting an indication of an impedance mismatch between an implantable transceiver in an implantable medical device and an implantable antenna of the implantable medical device, wherein an effective impedance of the antenna is variable dependent upon at least one of whether the antenna is implanted into a subject, a location at which the antenna is implanted into the subject, and a body shape of the subject; and means for using the indication of the impedance mismatch as a control input for adjusting a matching circuit in a manner that decreases the impedance mismatch and increases or maximizes a communication power transfer value associated with the implantable medical device.
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13. A method comprising:
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detecting an indication of an impedance mismatch between an implantable transceiver in an implantable medical device and an implantable antenna of the implantable medical device, wherein an effective impedance of the antenna is variable dependent upon at least one of whether the antenna is implanted into a subject, a location at which the antenna is implanted into the subject, and a body shape of the subject; and using the indication of the impedance mismatch as a control input, adjusting a matching circuit in a manner that decreases the impedance mismatch and increases or maximizes a communication power transfer value associated with the implantable medical device. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification