[특허]Evoked response sensing for ischemia detection

Evoked response sensing for ischemia detection 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	A61N-001/37 A61N-001/362
출원번호	US-0962852 (2001-09-25)
등록번호	US-7340303 (2008-03-04)
발명자 / 주소	Zhu,Qingsheng
출원인 / 주소	Cardiac Pacemakers, Inc.
대리인 / 주소	Schwegman, Lundberg, & Woessner, P.A.
인용정보	피인용 횟수 : 29 인용 특허 : 147

초록 ▼

A cardiac pacemaker in which an electrogram is recorded from an evoked response sensing channel in order to detect changes indicative of cardiac ischemia. If such changes are detected, the maximum allowable pacing rate can be decreased for those pacing modes that allow the pacing rate to change with

대표청구항 ▼

What is claimed is: 1. A method for operating a cardiac pacemaker, comprising: sensing intrinsic cardiac activity in one or more cardiac chambers from a sensing channel; delivering paces to a cardiac chamber in accordance with a programmed pacing mode; recording an evoked response electrogram from the sensing channel when a pace is delivered; storing a representation of a previously recorded reference evoked response electrogram that indicates any baseline current of injury; looking for an increased current of injury by cross-correlating the recorded electrogram with the reference electrogram in order to detect a change indicative of ischemia; and, adjusting one or more pacing parameters that reduce the extent of pacing if a change indicative of cardiac ischemia is detected. 2. The method of claim 1 further comprising: sensing an exertion level and mapping the sensed exertion level to a particular sensor-indicated rate with a rate-response curve; adjusting an escape interval in order to enforce the sensor-indicated rate; and, wherein the specified maximum pacing rate is a maximum sensor-indicated rate. 3. The method of claim 2 further comprising adjusting the rate-response curve so that a particular exertion level is mapped to a lower sensor-indicated rate if a change in the electrogram indicative of cardiac ischemia is detected. 4. The method of claim 1 wherein the paced heart chamber is a ventricle and the programmed pacing mode is an atrial tracking mode such that a ventricular pace is delivered after expiration of an atrio-ventricular interval without a ventricular sense, the atrio-ventricular interval being started by an atrial sense, and further comprising decreasing a maximum tracking rate that limits the rate at which ventricular paces can be delivered in response to atrial senses if a change in the recorded electrogram indicative of cardiac ischemia is detected. 5. The method of claim 1 wherein an increased current of injury is looked for by cross-correlating the recorded electrogram with the reference electrogram using a matched filter. 6. A cardiac pacemaker, comprising: a sensing channel for sensing intrinsic cardiac activity and for sensing an evoked response to a pace; a pacing channel for pacing a cardiac chamber; a controller for delivering paces to the cardiac chamber in accordance with a programmed pacing mode wherein the controller is programmed to record an evoked response electrogram from the sensing channel when a pace is delivered; wherein the controller is programmed to store a representation of a previously recorded reference evoked response electrogram that indicates any baseline current of injury; wherein the controller is programmed to look for an increased current of injury by cross-correlating the recorded electrogram with the reference electrogram in order to detect a change indicative of cardiac ischemia; and, wherein the controller is programmed to adjust one or more pacing parameters that reduce the extent of pacing if a change indicative of cardiac ischemia is detected. 7. The pacemaker of claim 6 wherein the controller is further programmed to log a detected change in the electrogram indicative of cardiac ischemia as a clinically significant event. 8. The pacemaker of claim 6 further comprising an exertion level sensor and wherein the controller is further programmed to: sense an exertion level and map the sensed exertion level to a particular sensor-indicated rate with a rate-response curve, wherein the sensor-indicated rate is limited to a specified maximum sensor-indicated rate; adjust an escape interval in order to enforce the sensor-indicated rate; and, decrease the specified maximum sensor-indicated rate if a change in the recorded electrogram indicative of cardiac ischemia is detected. 9. The pacemaker of claim 5 wherein the controller is further programmed to adjust the response factor of the rate-response curve so that a particular exertion level is mapped to a lower sensor-indicated rate if a change in the electrogram indicative of cardiac ischemia is detected. 10. The pacemaker of claim 6 wherein the paced heart chamber is a ventricle and the programmed pacing mode is an atrial tracking mode such that a ventricular pace is delivered after expiration of an atrio-ventricular interval without a ventricular sense, the atrio-ventricular interval being started by an atrial sense, and further wherein the controller is programmed to decrease a maximum tracking rate that limits the rate at which ventricular paces can be delivered in response to atrial senses if a change in the recorded electrogram indicative of cardiac ischemia is detected. 11. The pacemaker of claim 6 wherein the controller is programmed to look for an increased current of injury by cross-correlating the recorded electrogram with the reference electrogram using a matched filter.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

내보내기 구분	파일저장 인쇄 메일전송
구성항목	기본정보 상세정보 관리번호, 국가코드, 자료구분, 상태, 출원번호, 출원일자, 공개번호, 공개일자, 등록번호, 등록일자, 발명명칭(한글), 발명명칭(영문), 출원인(한글), 출원인(영문), 출원인코드, 대표IPC 관리번호, 국가코드, 자료구분, 상태, 출원번호, 출원일자, 공개번호, 공개일자, 공고번호, 공고일자, 등록번호, 등록일자, 발명명칭(한글), 발명명칭(영문), 출원인(한글), 출원인(영문), 출원인코드, 대표출원인, 출원인국적, 출원인주소, 발명자, 발명자E, 발명자코드, 발명자주소, 발명자 우편번호, 발명자국적, 대표IPC, IPC코드, 요약, 미국특허분류, 대리인주소, 대리인코드, 대리인(한글), 대리인(영문), 국제공개일자, 국제공개번호, 국제출원일자, 국제출원번호, 우선권, 우선권주장일, 우선권국가, 우선권출원번호, 원출원일자, 원출원번호, 지정국, Citing Patents, Cited Patents
저장형식	Text(ASCII format) Excel format PIAS분석(.xls)
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Evoked response sensing for ischemia detection 원문보기

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Evoked response sensing for ischemia detection 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

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