Subcutaneous cardiac sensing and stimulation system employing blood sensor
First Claim
1. An implantable subcutaneous device, comprising:
- a housing configured for subcutaneous non-intrathoracic placement;
detection circuitry provided in the housing and configured to produce a cardiac electrophysiologic signal;
energy delivery circuitry provided in the housing;
at least one electrode configured for subcutaneous non-intrathoracic placement and coupled to the detection and energy delivery circuitry;
an implantable blood sensor configured to produce a blood sensor signal; and
a processor provided in the housing and coupled to the blood sensor, the detection circuitry, and the energy delivery circuitry, the processor using the blood sensor signal to verify that the cardiac electrophysiologic signal comprises a cardiac signal having a QRS complex, the processor configured to discriminate between a tachyarrhythmia condition that requires cardioversion or defibrillation therapy and a condition that does not require cardioversion or defibrillation therapy using the cardiac electrophysiologic signal verified to have a QRS complex and the blood sensor signal, the processor configured to withhold delivery of cardioversion or defibrillation therapy in response to determining, using the blood sensor signal, that the condition does not require cardioversion or defibrillation therapy.
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Accused Products
Abstract
Cardiac systems and methods using ECG and blood information for arrhythmia detection and discrimination. Detection circuitry is configured to produce an ECG. An implantable blood sensor configured to produce a blood sensor signal is coupled to a processor. The processor is coupled to the detection and energy delivery circuitry, and used to evaluate and treat cardiac rhythms using both the cardiac electrophysiologic and blood sensor signals. The blood sensor is configured for subcutaneous non-intrathoracic placement and provided in or on the housing, on a lead coupled to the housing, and/or separate to the housing and coupled to the processor via hardwire or wireless link. The blood sensor may be configured for optical sensing, using a blood oxygen saturation sensor or pulse oximeter. A cardiac rhythm may be evaluated using the electrocardiogram signal and the blood sensor signal, and tachyarrhythmias may be treated after confirmation using the blood sense signal.
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Citations
23 Claims
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1. An implantable subcutaneous device, comprising:
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a housing configured for subcutaneous non-intrathoracic placement; detection circuitry provided in the housing and configured to produce a cardiac electrophysiologic signal; energy delivery circuitry provided in the housing; at least one electrode configured for subcutaneous non-intrathoracic placement and coupled to the detection and energy delivery circuitry; an implantable blood sensor configured to produce a blood sensor signal; and a processor provided in the housing and coupled to the blood sensor, the detection circuitry, and the energy delivery circuitry, the processor using the blood sensor signal to verify that the cardiac electrophysiologic signal comprises a cardiac signal having a QRS complex, the processor configured to discriminate between a tachyarrhythmia condition that requires cardioversion or defibrillation therapy and a condition that does not require cardioversion or defibrillation therapy using the cardiac electrophysiologic signal verified to have a QRS complex and the blood sensor signal, the processor configured to withhold delivery of cardioversion or defibrillation therapy in response to determining, using the blood sensor signal, that the condition does not require cardioversion or defibrillation therapy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An implantable subcutaneous device, comprising:
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a housing configured for subcutaneous non-intrathoracic placement; detection circuitry provided in the housing and configured to produce a cardiac electrophysiologic signal; energy delivery circuitry provided in the housing; at least one electrode configured for subcutaneous non-intrathoracic placement and coupled to the detection and energy delivery circuitry; an implantable photoplethysmography sensor configured for deployment between a layer of skin and a layer of extrathoracic muscle tissue and having a photodetector arrangement oriented towards the muscle tissue, and to produce a blood sensor signal; and a processor provided in the housing and coupled to the blood sensor, the detection circuitry, and the energy delivery circuitry, the processor configured to identify an indication of a tachyarrhythmia condition based on the cardiac electrophysiologic signal, activate the blood sensor to produce the blood sensor signal based on the identification of the indication of the tachyarrhythmia condition, verify that the cardiac electrophysiologic signal comprises a QRS complex using the blood sensor signal, confirm presence of the tachyarrhythmia condition based on the cardiac electrophysiologic signal verified to have a QRS complex and the blood sensor signal, and initiate delivery of an electrical cardiac therapy to treat the tachyarrhythmia condition using the energy delivery circuitry based on the confirmed presence of the tachyarrhythmia condition, wherein the electrical cardiac therapy is withheld by the processor if the tachyarrhythmia condition is not confirmed from the blood sensor signal. - View Dependent Claims (20, 21, 22, 23)
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Specification