[특허]Method and apparatus for processing quasi-transient telemetry signals in noisy environments

Method and apparatus for processing quasi-transient telemetry signals in noisy environments 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	A61N-001/362
출원번호	US-0612046 (1990-11-09)
발명자 / 주소	Grevious John (Minneapolis MN)
출원인 / 주소	Medtronic, Inc. (Minneapolis MN 02)
인용정보	피인용 횟수 : 116 인용 특허 : 0

초록 ▼

A software-controlled, external programmer for transcutaneously programming and receiving data from an implanted medical device providing enhanced discrimination and detection of pulse-interval-coded signals of interest telemetered out of the implanted medical device from undesirable transient and steady-state noise. The programmer incorporates a detector including an active mixer and a precision tuned active phase shifting network providing low level signal rectification, precise narrow bandpass filtering, and 30 decibels of amplification. At the detector, the received signal is mixed with a phase shifted version of itself to produce a detected DC component which is a function of frequency. The DC response emulates a system with a narrow 25 kHz bandpass filter operating at 175 kHz, but does not share its undesirable transient response. For signals in the reject band, the output produces a signal of the opposite polarity of the signals within the pass bands. Transient0 noise excites the receiver antenna and produces a ringing response accompanied by components above 400 kHz. The noise response of the antenna stimulates the detector to produce the intended inverted output. As the transient noise amplitude increases, the inverted response increases in amplitude driving the output level further away from the trigger level of a post-detection comparator. Similarly, any steady state noise signal in the reject band will also result in a steady state inverted response that does not trigger the comparator.

대표청구항 ▼

In a transceiver for transmitting and receiving radio frequency signals from an implantable medical device, said transceiver including a telemetry receiver comprising an inductive-capacitive tuned antenna circuit, signal detection means and signal discrimination means, and wherein said signals are representative of either analog or digital values and wherein said signals are induced in said inductive-capacitive tuned antenna circuit, the improvement in detecting and discriminating received data signals from noise signals comprising: means for amplifying RF signals induced within said inductive-capacitive tuned antenna circuit and providing an amplified RF signal; means responsive to said amplified RF signal for shifting its phase and for providing a phase shifted, amplified RF signal; means for mixing said phase shifted, amplified RF signal with said amplified RF signal for providing a monophasic component of said mixed RF amplified signal, the amplitude of which is a function of frequency; means for establishing a threshold amplitude value; means for demodulating said monophasic component of said mixed RF amplified signal for providing a detected DC component of said RF amplified signal; and means for comparing the amplitude of said DC component with said threshold amplitude for providing a detected and demodulated output signal discriminated from noise signals, wherein said output signal represents implanted medical device performance characteristics or programming parameters.

이 특허를 인용한 특허 (116)

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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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Method and apparatus for processing quasi-transient telemetry signals in noisy environments 원문보기

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Method and apparatus for processing quasi-transient telemetry signals in noisy environments 원문보기

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