Cardiac sense amplifier for capture verification
First Claim
1. A cardiac rhythm management device having a capture verification sensing circuit for use in at least one of a normal beat to beat stimulation mode and autothreshold mode, said cardiac rhythm management device including:
- (a) control means for selectively delivering electrical stimuli to a patient'"'"'s heart and for detecting at least one of intrinsic and paced stimulations;
(b) electrodes adapted to be positioned within the heart connected to an electrical conducting means for electrically connecting said electrodes to said control means; and
(c) sensing means for sensing electrical activity of the patient'"'"'s heart, said sensing means having a pre-amplifier electrically connected to said electrical conducting means, a first high pass coupling capacitor connected to said electrical conducting means between said electrode and said pre-amplifier, a blanking switch connected to said electrical conducting means between said high pass coupling capacitor and said pre-amplifier a high pass termination resistor connected to said electrical conducting means between said blanking switch and said pre-amplifier, a low pass coupling capacitor connected to said electrical conducting means between said blanking switch and said pre-amplifier a low pass resistor connected to said electrical conducting means between said blanking switch and said pre-amplifier and a low pass bi-pass switch connected to said electrical conducting means between said blanking switch and said pre-amplifier, said low pass bi-pass switch selectively connecting said low pass coupling capacitor and said low. pass resistor to said electrical conducting means, said sensing means including a dedicated evoked response amplifier.
1 Assignment
0 Petitions
Accused Products
Abstract
A cardiac rhythm management device having a capture verification sensing circuit for use in either a normal beat to beat pacing mode or an autothreshold mode. The cardiac rhythm management device is coupled to one or more pacing leads having pacing/sensing electrodes coupled thereto, and includes a sensing circuit for sensing electrical activity of the patient'"'"'s heart, wherein the sensing circuit includes a dedicated evoked response sense amplifier and at least one high pass coupling capacitor electrically connected as a portion of a high pass network and between a pacing/sensing electrode and a blanking switch. A plurality of high pass coupling capacitors are coupled in parallel each having a separate blanking switch, thereby creating a differential network to offset imbalance sensed from the electrode due to extraneous factors.
102 Citations
5 Claims
-
1. A cardiac rhythm management device having a capture verification sensing circuit for use in at least one of a normal beat to beat stimulation mode and autothreshold mode, said cardiac rhythm management device including:
-
(a) control means for selectively delivering electrical stimuli to a patient'"'"'s heart and for detecting at least one of intrinsic and paced stimulations;
(b) electrodes adapted to be positioned within the heart connected to an electrical conducting means for electrically connecting said electrodes to said control means; and
(c) sensing means for sensing electrical activity of the patient'"'"'s heart, said sensing means having a pre-amplifier electrically connected to said electrical conducting means, a first high pass coupling capacitor connected to said electrical conducting means between said electrode and said pre-amplifier, a blanking switch connected to said electrical conducting means between said high pass coupling capacitor and said pre-amplifier a high pass termination resistor connected to said electrical conducting means between said blanking switch and said pre-amplifier, a low pass coupling capacitor connected to said electrical conducting means between said blanking switch and said pre-amplifier a low pass resistor connected to said electrical conducting means between said blanking switch and said pre-amplifier and a low pass bi-pass switch connected to said electrical conducting means between said blanking switch and said pre-amplifier, said low pass bi-pass switch selectively connecting said low pass coupling capacitor and said low. pass resistor to said electrical conducting means, said sensing means including a dedicated evoked response amplifier. - View Dependent Claims (2, 3, 4)
-
-
5. A cardiac pacer having a capture verification sensing circuit for use in at least one of a normal beat to beat switch and said pre-amplifier, wherein each of said first and second sensing means has a low pass resistor coupled to said electrical conducting means between said blanking switch and said pre-amplifier, wherein each of said first and second sensing means has a low pass bi-pass switch coupled to said electrical conducting means between said blanking switch and said pre-amplifier, each said low pass bi-pass switch selectively coupling each said low pass coupling capacitor and each said low pass resistor to said electrical conducting means, and further including a dedicated evoked response amplifier coupled thereto.
Specification