SELECTABLE SWITCHING OF IMPLANTABLE SENSORS TO PROVIDE FAULT TOLEANCE FOR IMPLANTABLE MEDICAL DEVICES
First Claim
1. A fault tolerant active implantable medical device (AIMD) coupled to an implantable physiologic sensor (IPS), comprising:
- a pair of electrodes;
a therapy delivery circuit coupled to the pair of electrodes, said therapy delivery circuit including means for timing therapy delivery between the pair of electrodes;
an implantable physiologic sensor (IPS) adapted for chronic implantation, said IPS providing an output signal related to a patient parameter; and
a sensor signal processing circuit including means for selectively coupling and decoupling a source of power to the IPS and the output signal based on the means for timing therapy delivery.
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Accused Products
Abstract
The present disclosure provides one or more structures, techniques, components and/or methods for avoiding or positively resolving failure modes for an implanted medical device coupled to one or more sensors. A common fault scenario involves unintended stimulation during therapy delivery. A pacing stimulus can couple to exposed conductive portion(s) of a medical electrical lead (e.g., a tip portion) that includes a sensor to cause the stimulation. Stimulation also occurs due to insulation breaches of a lead. Stimulation can also result from a breach in insulation surrounding a conductive set screw that couples the lead to active circuitry. Stimulation also results when high energy therapy energy shunts to sensor circuitry (e.g., sensor bus) via insulation breach of the sensor lead and/or the circuitry. Such unintended stimulation is avoided by disconnecting the pressure sensing lead and sensor: during therapy delivery, when impedance measurement or current measurement to the sensor indicate unintended stimulation.
156 Citations
20 Claims
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1. A fault tolerant active implantable medical device (AIMD) coupled to an implantable physiologic sensor (IPS), comprising:
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a pair of electrodes;
a therapy delivery circuit coupled to the pair of electrodes, said therapy delivery circuit including means for timing therapy delivery between the pair of electrodes;
an implantable physiologic sensor (IPS) adapted for chronic implantation, said IPS providing an output signal related to a patient parameter; and
a sensor signal processing circuit including means for selectively coupling and decoupling a source of power to the IPS and the output signal based on the means for timing therapy delivery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A fault tolerant method for both delivering an electrical stimulation therapy to a patient and sensing a physiologic parameter of said patient, comprising:
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delivering an electrical stimulation therapy between a pair of implantable electrodes, wherein said delivering includes timing therapy delivery between the pair of implantable electrodes;
providing an output signal related to a physiologic patient parameter via an implantable physiologic sensor (IPS), wherein said IPS is adapted for chronic implantation; and
selectively coupling and decoupling a source of power to the IPS and the output signal from the IPS based upon one of;
the timing of the therapy delivery, a measurement of an impedance parameter of the output signal, a measurement of the electrical current of the output signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification