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특허 상세정보

Check valve

국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판) F16K-017/30    A61M-001/00   
미국특허분류(USC) 137/517; 604/027
출원번호 UP-0831204 (2007-07-31)
등록번호 US-7849875 (2011-02-10)
발명자 / 주소
출원인 / 주소
인용정보 피인용 횟수 : 0  인용 특허 : 81
초록

A check valve having a piston-like ball or stopper a pre-determined distance from the valve seat so that the ball or stopper seats against the valve seat only under backflow pressure.

대표
청구항

I claim: 1. A surgical handpiece used to perform liquefaction during a cataract procedure, comprising: a hollow housing having a stem valve seat; a stopper configured to reciprocate within the hollow housing, the stopper comprising: a piston head, an extended stem coupled to the piston head; and a spring extending along the stem to engage the piston head to bias the piston head away from the stem valve seat so as to form a gap between the stem valve seat and the stem when a first pressure on the piston head provides an opposing force on the piston head...

이 특허에 인용된 특허 (81)

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