Implantable medical device incorporating integrated circuit notch filters
First Claim
1. An implantable medical device operable to perform a therapeutic and/or monitoring function in a living body while exposed to sources of electromagnetic interference (EMI) comprising:
- a housing having a housing side wall and inner and outer wall surfaces of a predetermined contour enclosing a hermetically sealed chamber;
a battery enclosed within said hermetically sealed chamber; and
electronic circuitry enclosed within said hermetically sealed chamber powered by the battery comprising a plurality of discrete components and at least one integrated circuit IC chip having an IC chip substrate and mounted to a circuit board dimensioned to fit within said hermetically sealed chamber along with said battery, said electronic circuitry comprising at least one notch filter having an input and output that blocks predetermined EMI signal frequencies while passing other signal frequencies from the input to the output, the notch filter formed of at least one IC fabricated inductor formed integrally with said IC chip.
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Abstract
Implantable medical devices (IMDs) having sense amplifiers for sensing physiologic signals and parameters, RF telemetry capabilities for uplink transmitting patient data and downlink receiving programming and interrogation commands to and from an external programmer or other medical device are disclosed. At least one IC chip and discrete components have a volume and dimensions that are optimally minimized to reduce its volumetric form factor. Miniaturization techniques include forming notch filters of MEMS structures or forming discrete circuit notch filters by one or more of: (1) IC fabricating inductors into one or more IC chips mounted to the RF module substrate; (2) mounting each IC chip into a well of the RF module substrate and using short bonding wires to electrically connect bond pads of the RF module substrate and the IC chip; and (3) surface mounting discrete capacitors over IC chips to reduce space taken up on the RF module substrate. The IC fabricated inductors are preferably fabricated as planar spiral wound conductive traces formed of high conductive metals to reduce trace height and width while maintaining low resistance, thereby reducing parasitic capacitances between adjacent trace side walls and with a ground plane of the IC chip. The spiral winding preferably is square or rectangular, but having truncated turns to eliminate 90° angles that cause point-to-point parasitic capacitances. The planar spiral wound conductive traces are further preferably suspended over the ground plane of the IC chip substrate by micromachining underlying substrate material away to thereby reduce parasitic capacitances.
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Citations
38 Claims
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1. An implantable medical device operable to perform a therapeutic and/or monitoring function in a living body while exposed to sources of electromagnetic interference (EMI) comprising:
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a housing having a housing side wall and inner and outer wall surfaces of a predetermined contour enclosing a hermetically sealed chamber;
a battery enclosed within said hermetically sealed chamber; and
electronic circuitry enclosed within said hermetically sealed chamber powered by the battery comprising a plurality of discrete components and at least one integrated circuit IC chip having an IC chip substrate and mounted to a circuit board dimensioned to fit within said hermetically sealed chamber along with said battery, said electronic circuitry comprising at least one notch filter having an input and output that blocks predetermined EMI signal frequencies while passing other signal frequencies from the input to the output, the notch filter formed of at least one IC fabricated inductor formed integrally with said IC chip. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 21, 22, 23, 25, 26, 27, 28, 29, 30, 31, 32, 33, 35, 36, 37, 38)
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14. An implantable medical device operable to perform a therapeutic and/or monitoring function in a living body while exposed to sources of electromagnetic interference (EMI) comprising:
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a housing having a housing side wall and inner and outer wall surfaces of a predetermined contour enclosing a hermetically sealed chamber;
a battery enclosed within said hermetically sealed chamber;
at least one sense electrode located outside said housing adapted to be located in relation to body tissue to detect electrical signals of the body tissue;
sense amplifier circuitry enclosed within said hermetically sealed chamber powered by the battery and coupled to said sense electrode, the sense amplifier circuitry comprising a plurality of discrete components and at least one integrated circuit IC chip having an IC chip substrate and mounted to a circuit board dimensioned to fit within said hermetically sealed chamber along with said battery, said sense amplifier circuitry comprising at least one notch filter that blocks EMI signal frequencies received from the sense electrode and passes signal frequencies of interest, the notch filter formed of at least one IC fabricated inductor formed integrally with said IC chip.
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24. An implantable medical device operable to perform a therapeutic and/or monitoring function in a living body while exposed to sources of electromagnetic interference (EMI) comprising:
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a housing having a housing side wall and inner and outer wall surfaces of a predetermined contour enclosing a hermetically sealed chamber;
a battery enclosed within said hermetically sealed chamber;
at least physiologic sensor located outside said housing adapted to be located in relation to body tissue to detect a physiologic body parameter;
physiologic signal processing circuitry enclosed within said hermetically sealed chamber powered by the battery and coupled to said physiologic sensor, the physiologic signal processing circuitry comprising a plurality of discrete components and at least one integrated circuit IC chip having an IC chip substrate and mounted to a circuit board dimensioned to fit within said hermetically sealed chamber along with said battery, said electronic circuitry comprising at least one notch filter that blocks predetermined EMI signal frequencies and passes other signal frequencies received from the physiologic sensor, the notch filter formed of at least one IC fabricated inductor formed integrally with said IC chip.
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34. An implantable medical device operable to perform a therapeutic and/or monitoring function in a living body while exposed to sources of electromagnetic interference (EMI) comprising:
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a housing having a housing side wall and inner and outer wall surfaces of a predetermined contour enclosing a hermetically sealed chamber;
a battery enclosed within said hermetically sealed chamber;
electronic circuitry enclosed within said hermetically sealed chamber powered by the battery comprising a plurality of discrete components and at least one integrated circuit IC chip having an IC chip substrate and mounted to a circuit board dimensioned to fit within said hermetically sealed chamber along with said battery, said electronic circuitry comprising at least one notch filter having an input and output that blocks passage of predetermined EMI signal frequencies and passes other signal frequencies from the input to the output, the notch filter formed of at least one IC fabricated microelectromechanical filter element formed integrally with said IC chip.
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Specification