Subthreshold lead impedance measurement for subcutaneous device
First Claim
1. An implantable medical system, comprising:
- a housing;
a lead coupled to the housing;
a first electrode coupled at a distal end of the lead;
a second electrode;
an operational circuitry disposed within the housing, the operational circuitry including;
an energy source;
a diode electrically coupled to the energy source at a first terminal;
an output circuit arrayed having a high side and a low side and including four interconnected legs, the high side having a first leg and a third leg and the low side having a second leg and a fourth leg, wherein the first leg is coupled between a second terminal of the diode and the first electrode and the fourth leg is coupled to the second electrode, wherein each of the four interconnected legs comprises a semiconductor device;
an impedance testing leg coupled to the output circuit; and
a control circuit configured to control monitoring of a voltage between the first electrode and the second electrode.
1 Assignment
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Accused Products
Abstract
A subthreshold lead impedance technique is described for an implantable medical device. The lead impedance technique may be applicable to a subcutaneous implantable cardioversion defibrillator device and utilizes an output circuit of the device coupled between a first diode and a second diode to define a current path through two electrodes coupled to the output circuit. The second diode is further coupled to a switch to provide a current pathway from the first diode to circuit ground. A control circuit is coupled to the output circuit, the first diode, the second diode, and the switch to bias a leg of the output circuit in a conducting state while biasing the other legs of the output circuit in a non-conducting state.
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Citations
20 Claims
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1. An implantable medical system, comprising:
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a housing; a lead coupled to the housing; a first electrode coupled at a distal end of the lead; a second electrode; an operational circuitry disposed within the housing, the operational circuitry including; an energy source; a diode electrically coupled to the energy source at a first terminal; an output circuit arrayed having a high side and a low side and including four interconnected legs, the high side having a first leg and a third leg and the low side having a second leg and a fourth leg, wherein the first leg is coupled between a second terminal of the diode and the first electrode and the fourth leg is coupled to the second electrode, wherein each of the four interconnected legs comprises a semiconductor device; an impedance testing leg coupled to the output circuit; and a control circuit configured to control monitoring of a voltage between the first electrode and the second electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An implantable medical system, comprising:
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a housing; a lead coupled to the housing; a first electrode coupled at a distal end of the lead; a second electrode; an operational circuitry disposed within the housing, the operational circuitry including; an energy source; a diode electrically coupled to the energy source at a first terminal; an output circuit arrayed having a high side and a low side and including four interconnected legs, the high side having a first leg and a third leg and the low side having a second leg and a fourth leg, wherein the first leg is coupled between a second terminal of the diode and the first electrode and the fourth leg is coupled to the second electrode; an impedance testing leg coupled to the output circuit; and a control circuit configured to control monitoring of a voltage between the first electrode and the second electrode, wherein the control circuit is further configured to direct a testing operation including biasing the first leg and the impedance testing leg in a conducting state and delivering a testing current from the energy source through the diode to the output circuit and to the impedance testing leg, the testing current being less than a stimulus pulse voltage, wherein the testing current is limited to a value that is below a stimulation threshold of a patient, and wherein the impedance testing leg includes a semiconductor switch and the control circuit modulates a gate of the switch to limit the testing current.
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Specification