Physiological signal amplifier with voltage protection and fast signal recovery
First Claim
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1. A subcutaneous medical device comprising:
- a first electrode;
a sense amplifier configured to sense a physiological electrical signal of a patient subsequent to delivery of a stimulation therapy through the first electrode without blanking; and
a processor configured to process the sensed physiological electrical signal;
wherein the sense amplifier includes a gain amplifier, a high pass filter, and a feedback network having a transistor coupled to the high pass filter, the feedback network being configured to clamp an input voltage to the gain amplifier at a predetermined threshold value responsive to the input voltage exceeding the predetermined threshold value.
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Abstract
A physiological sense amplifier achieves fast recovery times following receipt of a large voltage, such as when a defibrillation pulse is delivered, without blanking. The recovery time may be less than one millisecond when polarization of surrounding tissue or the housing of the device is not present. The sense amplifier uses a feedback network to clamp the input voltage to a gain amplifier at a predetermined value when a predetermined threshold value is exceeded.
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Citations
20 Claims
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1. A subcutaneous medical device comprising:
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a first electrode; a sense amplifier configured to sense a physiological electrical signal of a patient subsequent to delivery of a stimulation therapy through the first electrode without blanking; and a processor configured to process the sensed physiological electrical signal; wherein the sense amplifier includes a gain amplifier, a high pass filter, and a feedback network having a transistor coupled to the high pass filter, the feedback network being configured to clamp an input voltage to the gain amplifier at a predetermined threshold value responsive to the input voltage exceeding the predetermined threshold value. - 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. A subcutaneous medical device comprising:
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a first electrode; a sense amplifier coupled to the first electrode and configured to sense a physiological electrical signal through the first electrode without blanking, wherein the first electrode delivers a stimulation therapy prior to the sensing of the physiological electrical signal; and a processor configured to process the sensed physiological electrical signal, wherein the sense amplifier includes a gain amplifier and a feedback network configured to clamp an input voltage to the gain amplifier at a predetermined threshold value immediately subsequent to delivery of the stimulation therapy.
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20. A subcutaneous medical device comprising:
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a first electrode; a sense amplifier operable in a first mode and a second mode and including a transistor coupled to a resistor, the sense amplifier being coupled to the first electrode to receive a sensed physiological electrical signal, wherein the sense amplifier is operable in the first mode responsive to an input to the sense amplifier being less than a predetermined threshold value and in the second mode responsive to the input to the sense amplifier being greater than the predetermined threshold value; and a processor configured to process the sensed physiological electrical signal, wherein the input to the sense amplifier is clamped at the predetermined threshold value in the second mode.
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Specification