[특허]Fault-tolerant elective replacement indication for implantable medical device

Fault-tolerant elective replacement indication for implantable medical device 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	A61N-001/378
출원번호	US-0275863 (1994-07-15)
발명자 / 주소	Shelton Michael B. (Minneapolis MN) Starkson Ross O. (Woodbury MN) Schmidt Craig L. (Eagan MN) Markowitz H. Toby (Roseville MN)
출원인 / 주소	Medtronic, Inc. (Minneapolis MN 02)
인용정보	피인용 횟수 : 72 인용 특허 : 0

초록 ▼

A pacemaker having a fault-tolerant elective replacement indicator (ERI) triggering scheme in which transient excursions of parameters used as criteria for triggering ERI are rejected as triggering events. Periodic assessments of certain indicia of battery depletion are made, and subjected to a long-term low-pass filtering operation in order to reduce the effects of transient excursions of the indicia which result from non-ERI conditions. Over a long period of time (e.g., a day) predetermined threshold values of the indicia of interest must be exceeded a predetermined number of times in order for the device to issue an ERI. In one disclosed embodiment of the invention, the battery\s loaded terminal voltage and internal impedance are used as indicators of the battery\s depletion level. Periodically, these values are measured and converted to digital values. The digital values are subjected to a low-pass filtering operation to prevent temporary or transient excursions of the impedance and voltage curves from causing ERI to be triggered. In another disclosed embodiment of the invention, a long term fading average of periodically measured values is maintained. When the measured values are found to fulfill the ERI criteria, assessment of the parameters of interest is performed at an increased rate. While assessments are performed at the increased rate, the continuously updated fading average value must fulfill the ERI triggering criteria at least a predetermined number of times before ERI is triggered. If the fading average fails to fulfill the ERI triggering criteria the required number of times, assessments are resumed at the first, slower periodic rate.

대표청구항 ▼

An apparatus for indicating when a battery\s depletion level exceeds a predetermined maximum, comprising: a first monitoring circuit, coupled to said battery and adapted to periodically assess a first condition of said battery known to reflect said battery\s depletion level, and to periodically generate at least one first condition signal indicative of said first condition; a first comparison circuit, coupled to said first monitoring circuit and responsive to said at least one first condition signal to assert a first comparison signal when said first condition signal indicates that said first condition reflects a level of battery depletion greater than said predetermined maximum; a second monitoring circuit, coupled to said battery and to said first comparison circuit, said second monitoring circuit responsive to said assertion of said first comparison signal to assess a second condition of said battery known to reflect said battery\s depletion level, and to generate at least one second condition signal indicative of said second condition; a second comparison circuit, coupled to said second monitoring circuit and responsive to said at least one second condition signal to assert a second comparison signal when said second condition signal indicates that said second condition reflects a level of battery depletion greather than said predetermined maximum; an accumulator circuit, coupled to said second comparison circuit and responsive to assertion of said second comparison signal to increment an accumulator value; a depletion indicator circuit, coupled to said accumulator circuit and adapted to assert a depletion indicator signal when said accumulator value exceeds a predetermined maximum, said depletion indicator circuit further adapted to periodically reset said accumulator value.

이 특허를 인용한 특허 (72)

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Weiner, Michael L.; Helfer, Jeffrey L.; Connelly, Patrick R.; MacDonald, Stuart G.; Miller, Victor, Electromagnetic interference immune tissue invasive system.
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Weiner, Michael L.; Helfer, Jeffrey L.; Connelly, Patrick R.; MacDonald, Stuart G.; Miller, Victor, Electromagnetic interference immune tissue invasive system.
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Weiner, Michael L.; Helfer, Jeffrey L.; MacDoanld, Stuart G.; Connelly, Patrick R.; Miller, Victor, Electromagnetic interference immune tissue invasive system.
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Weiner, Michael L.; MacDoanld, Stuart G.; Connelly, Patrick R., Electromagnetic interference immune tissue invasive system.
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MacDonald, Stuart G.; Helfer, Jeffrey L.; Weiner, Michael L., Electromagnetic radiation immune medical assist device adapter.
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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

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연합인증

Fault-tolerant elective replacement indication for implantable medical device 원문보기

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Fault-tolerant elective replacement indication for implantable medical device 원문보기

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연구과제 타임라인

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