Isolation of sensing and stimulation circuitry
First Claim
1. An implantable medical device (IMD) comprising:
- a housing;
a cardiac module, in the housing, configured to deliver electrical stimulation therapy to a patient;
a power source that couples to the cardiac module and is configured to provide power to the cardiac module;
at least one isolation circuit that couples to the power source; and
a neurostimulation module, in the housing, that couples to the power source via the at least one isolation circuit and is configured to deliver electrical stimulation therapy to the patient or sense a physiological condition of the patient,wherein the at least one isolation circuit is configured to electrically isolate the power source from the neurostimulation module to reduce common-mode interference on the neurostimulation module, andwherein the common-mode interference is caused by the cardiac module delivering electrical stimulation therapy to the patient.
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Accused Products
Abstract
The disclosure describes techniques of reducing or eliminating a commonality between two modules within the same implantable medical device. Each module within the implantable medical device provides therapy to a patient. The commonality between the two modules exists due to at least one common component shared by the two modules. The commonality between the two modules may create common-mode interference and a shunt current. In accordance with this disclosure, various isolation circuits located at various locations are disclosed to reduce or eliminate the commonality between the two modules. The reduction or elimination of the commonality between the two modules may reduce or eliminate common-mode interference and the shunt current.
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Citations
36 Claims
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1. An implantable medical device (IMD) comprising:
a housing; a cardiac module, in the housing, configured to deliver electrical stimulation therapy to a patient; a power source that couples to the cardiac module and is configured to provide power to the cardiac module; at least one isolation circuit that couples to the power source; and a neurostimulation module, in the housing, that couples to the power source via the at least one isolation circuit and is configured to deliver electrical stimulation therapy to the patient or sense a physiological condition of the patient, wherein the at least one isolation circuit is configured to electrically isolate the power source from the neurostimulation module to reduce common-mode interference on the neurostimulation module, and wherein the common-mode interference is caused by the cardiac module delivering electrical stimulation therapy to the patient.
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2. An implantable medical device (IMD) comprising:
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a housing; a first module, in the housing, configured to deliver electrical stimulation therapy to a patient; a power source that couples to the first module and is configured to provide power to the first module; at least one isolation circuit that couples to the power source; and a second module, in the housing, that couples to the power source via the at least one isolation circuit and is configured to deliver electrical stimulation therapy to the patient or sense a physiological condition of the patient, wherein the at least one isolation circuit is configured to electrically isolate the power source from the second module to reduce at least one of common-mode interference and shunt current on the second module, and wherein the at least one of common-mode interference and shunt current is caused by the first module delivering electrical stimulation therapy to the patient. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method comprising:
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delivering, via a first module within a housing of an implantable medical device (IMD), electrical stimulation therapy to a patient, wherein the first module is powered via a power source; delivering, via a second module within the housing of the IMD, electrical stimulation therapy to the patient or sensing, via the second module within the housing of the IMD, a physiological condition of the patient, wherein the second module is powered via at least one isolation circuit that couples to the power source; and isolating the power source from the second module via the at least one isolation circuit to reduce at least one of common-mode interference and shunt current on the second module, wherein delivering electrical stimulation via the first module causes the at least one of common-mode interference and shunt current. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. An implantable medical device (IMD) comprising:
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a housing; a first means, in the housing, for delivering electrical stimulation therapy to a patient, wherein the first means is powered via a power source; and a second means, in the housing, for delivering a electrical stimulation therapy to the patient or sensing a physiological condition of the patient, wherein the second means is powered via at least one means for isolating that couples to the power source, wherein the means for isolating isolates the power source from the second means to reduce at least one of common-mode interference and shut shunt current on the second means, wherein delivering electrical stimulation via the first means causes the at least one of common-mode interference and shunt current.
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35. An implantable medical device (IMD) comprising:
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a housing; a cardiac module, in the housing, configured to deliver electrical stimulation therapy to a patient; a power source that couples to the cardiac module and is configured to provide power to the cardiac module; at least one isolation circuit that couples to the power source, wherein the at least one isolation circuit comprises; a first and a second switch coupled to a first and a second input line, respectively, wherein the first input line and the second input line are coupled to the power source and a ground of the power source, respectively; a capacitor circuit that is coupled to the first and second switch; a third and fourth switch, wherein the capacitor circuit is coupled to the third and fourth switch, and wherein the third switch is further coupled to the first switch and the fourth switch is further coupled to the second switch; a capacitor, wherein the capacitor is coupled to the third and fourth switch; and a fifth and sixth switch coupled to a first and second output line, respectively, wherein the capacitor is coupled to the fifth and sixth switch, wherein, in a first state, the first and second switches are closed and the third, fourth, fifth, and sixth switches are opened to charge the capacitor circuit, in a second state, the first, second, fifth and sixth switches are opened and the third and fourth switches are closed to discharge the capacitor circuit and charge the capacitor, and, in a third state, the third and fourth switches are opened and the first, second, fifth, and sixth switches are closed to provide isolated power to the neurostimulation module coupled to the isolation circuit, wherein after the capacitor discharges, the first and second switches are opened and the third and fourth switches are closed to charge the capacitor and provide isolated power, and wherein after the capacitor charges, the third and fourth switches are opened and the first and second switches are closed to provide power on the first and second output line; and a neurostimulation module, in the housing, that couples to the first output line and the second output line of the at least one isolation circuit to receive power and is configured to deliver electrical stimulation therapy to the patient or sense a physiological condition of the patient, wherein the at least one isolation circuit is configured to electrically isolate the power source from the neurostimulation module to reduce at least one of common-mode interference and shunt current on the neurostimulation module, and wherein the at least one of common-mode interference and shunt current is caused by the cardiac module delivering electrical stimulation therapy to the patient.
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36. An implantable medical device (IMD) comprising:
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a housing; a processor; a cardiac module, in the housing, configured to deliver electrical stimulation therapy to a patient; a power source that couples to the cardiac module and is configured to provide power to the cardiac module; at least one isolation circuit that couples to the power source, wherein the at least one isolation circuit comprises; an oscillator coupled to a first and a second input line and further coupled to the processor, and configured to generate a first oscillating pulse that comprises data provided by the processor, wherein the first and the second input line are coupled to the power source and a ground of the power source; a transformer coupled to the oscillator and configured to transform the first oscillating pulse to a second oscillating pulse; a data demodulator coupled to the transformer and configured to provide data between the cardiac and neurostimulation modules; a rectifier coupled to the transformer and configured to rectify the second oscillating pulse; and a capacitor coupled to the rectifier and configured to generate an isolated direct current (DC) voltage across a first and second output line; a neurostimulation module, in the housing, that couples to the first and second output line of the at least one isolation circuit and is configured to deliver electrical stimulation therapy to the patient or sense a physiological condition of the patient, wherein the at least one isolation circuit is configured to electrically isolate the power source from the neurostimulation module to reduce at least one of common-mode interference and shunt current on the neurostimulation module, and wherein the at least one of common-mode interference and shunt current is caused by the cardiac module delivering electrical stimulation therapy to the patient.
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Specification