IMPLANTABLE CARDIAC STIMULUS DEVICES AND METHODS WITH INPUT RECHARGE CIRCUITRY
First Claim
1. An implantable cardiac stimulus device comprising:
- input circuitry for receiving a signal;
electrodes coupled to the input circuitry to provide a cardiac signal for analysis; and
a recharge circuit coupled to the input circuitry;
wherein an input offset voltage occurs at the input circuitry; and
wherein the implantable cardiac stimulus device is configured to;
identify whether a change in the input offset voltage is likely; and
if so,operate the recharge circuit to accommodate changes to the input offset voltage.
1 Assignment
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Accused Products
Abstract
An illustrative embodiment includes an implantable cardiac stimulus device comprising input circuitry configured to reduce the time required to return to small signal operation after a disturbance of small signal operation. In another illustrative embodiment, the present invention includes methods for operating an implantable cardiac stimulus device to reduce the time required to return to small signal operation after a disturbance of small signal operation. In yet additional embodiments, the initiation of small signal operation after a change in sensing vector and/or after delivery of a stimulus to the patient is improved by the inclusion of input circuitry and/or the use of methods adapted to reduce the time needed to reach small signal operation.
59 Citations
21 Claims
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1. An implantable cardiac stimulus device comprising:
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input circuitry for receiving a signal; electrodes coupled to the input circuitry to provide a cardiac signal for analysis; and a recharge circuit coupled to the input circuitry; wherein an input offset voltage occurs at the input circuitry; and wherein the implantable cardiac stimulus device is configured to; identify whether a change in the input offset voltage is likely; and
if so,operate the recharge circuit to accommodate changes to the input offset voltage. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An implantable cardiac stimulus device comprising:
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input circuitry for receiving a signal; electrodes coupled to the input circuitry to provide a cardiac signal for analysis; and a recharge circuit coupled to the input circuitry for accommodating post-shock afterpotential; wherein the implantable cardiac stimulus device is configured to; observe cardiac function of a patient, determine whether stimulus is appropriate, deliver stimulus when appropriate, and after delivering stimulus, operate the recharge circuit - View Dependent Claims (8, 9, 10)
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11. A method of operating a cardiac stimulus device implanted in a patient, the cardiac stimulus device having input circuitry for receiving electrical cardiac signals from the patient, the method comprising:
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delivering stimulus to the patient; and operating a recharge circuit to accommodate changes in the DC status of the system and input circuitry following delivery of the stimulus. - View Dependent Claims (12, 13, 14)
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15. A method of operating a cardiac stimulus device implanted in a patient:
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the device comprising at least first and second electrodes configured to electrically sense cardiac activity by the patient, the first and second electrodes being selectively coupled to an ECG Amplifier for amplifying signal from the first and second electrodes via input circuitry including coupling capacitors; the method comprising; providing a recharge circuit coupled to the coupling capacitors; delivering a stimulus to the patient; during the stimulus delivery, isolating the ECG Amplifier from the first and second electrodes; and following stimulus delivery, operating the recharge circuit to accommodate changes in DC status of the system following stimulus delivery. - View Dependent Claims (16, 17)
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18. A method of operating an implanted cardiac stimulus device, the implanted cardiac stimulus device including input circuitry for receiving a signal and electrodes coupled to the input circuitry to provide a cardiac signal for analysis wherein an input offset voltage occurs at the input circuitry, the method comprising:
identifying whether a change in the input offset voltage is likely, and if so, operating a recharge circuit to accommodate a change in the input offset voltage. - View Dependent Claims (19, 20, 21)
Specification