Method and Apparatus for Guiding an External Needle to an Implantable Device
First Claim
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1. A system for generating a field relative to an implanted medical device, comprising:
- a coil array positioned in the implanted medical device including a plurality of coils each having a winding group formed on a flexible circuit;
a single power source in the implanted medical device to power all components of the implanted medical device including the coil array; and
a processor operable to energize the coil array according to selected instructions to assist in providing a substantially constant amplitude alternating current and/or voltage to the coil array;
wherein each of the plurality of coils in the coil array is formed substantially thin in the flexible circuit to provide a substantially thin profile of the flexible circuit.
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Abstract
A system to generate a navigation field relative to an implanted device is disclosed. The system can include a small and/or thin localizer array positioned in the implanted device. A power management scheme and circuits can be provided to conserve and resource power in the implanted device.
118 Citations
45 Claims
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1. A system for generating a field relative to an implanted medical device, comprising:
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a coil array positioned in the implanted medical device including a plurality of coils each having a winding group formed on a flexible circuit; a single power source in the implanted medical device to power all components of the implanted medical device including the coil array; and a processor operable to energize the coil array according to selected instructions to assist in providing a substantially constant amplitude alternating current and/or voltage to the coil array; wherein each of the plurality of coils in the coil array is formed substantially thin in the flexible circuit to provide a substantially thin profile of the flexible circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of operating a localizer associated with an implanted medical device having a single power source to generate a navigation field and transmit telemetry from the implanted medical device, the method comprising:
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operating the implanted medical device to deliver a therapy to a patient including drawing a current from the single power source; sending a stop signal to a receiver in the implanted medical device to stop the operation of the implanted medical device from delivering the therapy; in response to the stop signal, stopping the operation of the implanted medical device from delivering the therapy; after stopping operation of the implanted medical device from delivering the therapy, starting a port finder routine having sub-routines including starting a port finder timer to time the operation of the port finder routine; powering a coil to emit a field; determining whether the port finder timer has expired; when it is determined that the port finder timer has expired, restarting the operation of the implanted medical device to deliver the therapy. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A system to provide a constant amplitude alternating current and/or voltage to a localizer in an implanted medical device, comprising:
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an operational amplifier operable to receive an input voltage and output a reference voltage to a precision resistor and a first PMOS current mirror cascode; a NMOS current mirror operable to receive an output voltage from the precision resistor; a second PMOS current mirror cascode operable to receive an output voltage from the NMOS current mirror and the first PMOS current mirror cascode to output a substantially constant amplitude alternating current and/or voltage based on the output reference voltage; a first coil; a first capacitor; and a first switch to form a connection between the second PMOS current mirror cascode and the first coil and the first capacitor; wherein the first capacitor is operable to tune the frequency of the output from the first coil to a selected frequency. - View Dependent Claims (19, 20, 21, 22)
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23. A system for generating a field relative to an implanted medical device, comprising:
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a coil array positioned in the implanted medical device including a single coil or a plurality of coils each having a winding group formed on a circuit; a power source in the implanted medical device to power all components of the implanted medical device including the coil array; and a processor operable to energize the coil array according to selected instructions to assist in providing a current to the coil array; wherein each of the plurality of coils in the coil array is formed substantially thin in the flexible circuit to provide a substantially thin profile of the flexible circuit. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A system for receiving a field within an implanted medical device, comprising:
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a coil array positioned in the implanted medical device including a single coil or plurality of coils each having a winding group formed on a circuit; a power source in the implanted medical device to power all components of the implanted medical device; a processor operable to measure the signals from a received field according to selected instructions and generate data regarding the measured signals; and a telemetry processing system operable to receive the generated data regarding the measured signals to an external processor system; wherein the external processor system is operable to determine a location of an emitting system that is emitting the received field.
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36. A method of operating a localizer associated with an implanted medical device having a power source to generate a navigation field and transmit telemetry from the implanted medical device, the method comprising:
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operating the implanted medical device to deliver a therapy to a patient including drawing a current from the single power source; sending a stop signal to a receiver in the implanted medical device to stop the operation of the implanted medical device from delivering the therapy; in response to the stop signal, stopping the operation of the implanted medical device from delivering the therapy; after stopping operation of the implanted medical device from delivering the therapy, starting a port finder routine having sub-routines including starting a port finder timer to time the operation of the port finder routine; powering a coil to emit a field; determining whether the port finder timer has expired; when it is determined that the port finder timer has expired, restarting the operation of the implanted medical device to deliver the therapy. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45)
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Specification