Oxygen sensor based capture detection for a pacer
First Claim
Patent Images
1. An apparatus adapted to be implanted within a patient for detecting an evoked response of cardiac tissue evoked by a pacing pulse, comprising:
- a pulse generator for generating pacing pulses;
means for applying said pacing pulses to the heart;
sensing means for measuring the oxygen saturation of said patient and for generating an electrical signal representative of said oxygen saturation level;
a monitoring circuit means coupled to said sensing means for monitoring said electrical signal provided from said sensing means, for detecting the occurrence of a cardiac evoked response;
a capture detect timer defining a capture detect window after the generation of a pacing pulse by said pulse generator; and
capture detect logic means responsive to said monitoring circuit means and said capture detect timer for detecting the occurrence of said evoked response occurring within said capture detect window.
1 Assignment
0 Petitions
Accused Products
Abstract
A pacemaker system which includes an oxygen saturation sensor located near the distal end of a transvenous pacing lead generates a cycle-by-cycle variation of oxygen saturation indicative of the mechanical pumping action of the heart. A timer is used to define a detection window after the generation of a pacing pulse. The occurrence of a detected depolarization within the detection window indicates that the pacing pulses capture the heart.
93 Citations
11 Claims
-
1. An apparatus adapted to be implanted within a patient for detecting an evoked response of cardiac tissue evoked by a pacing pulse, comprising:
-
a pulse generator for generating pacing pulses; means for applying said pacing pulses to the heart; sensing means for measuring the oxygen saturation of said patient and for generating an electrical signal representative of said oxygen saturation level; a monitoring circuit means coupled to said sensing means for monitoring said electrical signal provided from said sensing means, for detecting the occurrence of a cardiac evoked response; a capture detect timer defining a capture detect window after the generation of a pacing pulse by said pulse generator; and capture detect logic means responsive to said monitoring circuit means and said capture detect timer for detecting the occurrence of said evoked response occurring within said capture detect window. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A cardiac pacemaker, comprising:
-
a pulse generator for generating pacing pulses; means for applying said pacing pulses to a heart; sensing means for measuring blood oxygen saturation level and for generating an electrical signal having a value representative of said oxygen saturation level; a capture detect timer defining a capture detect window after the generation of said pacing pulse by said pulse generator; means for defining a threshold oxygen saturation value; and capture detect circuitry comprising means coupled to said sensing means for comparing the value of said electrical signal provided from said sensing means to said threshold oxygen saturation value and for detecting that said pacing pulse captured said heart in response to the value of said electrical signal exceeding said threshold oxygen saturation value during said capture detect window. - View Dependent Claims (8, 9, 10, 11)
-
Specification