[특허]Cannula valve and seal system

[미국특허] Cannula valve and seal system 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	A61M-005/178 A61M-005/00 A61M-025/00
출원번호	US-0238475 (1994-05-05)
발명자 / 주소	Gerrone Carmen J. (110 Dunkard Church Rd. Stockton NJ 08559)
인용정보	피인용 횟수 : 107 인용 특허 : 0

초록 ▼

A surgical cannula includes a first valve seal for preventing insufflation gas from escaping from a patient\s abdomen when an instrument is inserted or removed through the cannula. The valve seal has a V-shaped cross section and includes two opposing lips which face each other across a slit. Each lip has an internal and external edge separated by an intermediate section. The front surface of the first seal is relatively flat and has a width X. The preferred distance between the internal and external edges is preferably one-half X. This permits the internal edges to absorb the shock and damage from the introduction of a sharp instrument such as a trocar into the cannula without destroying the sealing capability of the external edges. A spring-loaded tubular member is located within the cannula housing and a reducer subassembly and is normally biased away from the interior surface of the first seal. When an instrument is introduced into the tubular member, it opens the first seal in such a way as to avoid damage to the first seal and, further, permits the withdrawal of tissues without interference. A second fixed or permanent seal located at the rear end of the tubular means also helps to prevent gas loss. Moreover, a plurality of interchangeable end seals can be selectively attached to the end of the instrument. The end seals provide opening apertures that match instruments, such as trocars, having various different outside diameters.

대표청구항 ▼

A surgical apparatus for introducing an instrument into a patient comprising: a cannula having a long central axis, a first end, a second end and a lumen running therethrough; a cannula housing removably attached to said cannula; a first seal means located within said cannula housing for preventing the leakage of insufflation gas from said patient when said cannula is located in said patient, said first seal means including two opposed lips which contact each other across a slit located between them, wherein said first seal means has a normally closed state and an open state when an instrument is introduced into said lumen of said cannula, said two lips of said first seal means each including an internal and an external edge and a substantially flat intermediate section between said internal and external edges, wherein said internal and external edges of said substantially flat intermediate sections of said lips are in substantial contact with each other when said first seal means is in said closed state, said first seal means further including a distal end having a relatively flat external surface which is perpendicular to said long central axis of said cannula, said relatively flat surface having a width X, said first seal means having walls with a generally V-shaped cross-section and further including a proximal end and an inner and outer surface which define the sidewalls of said first seal means, said first seal means further including an internal, relatively flat surface extending between the inner edges of said lips and said sidewalls, wherein the distance between said internal and external edges of said two lips is approximately ½X; a reducer subassembly removably attached to said cannula housing, said reducer subassembly including an internal lumen; and, a hollow tubular means having an interior bore therethrough and located within the lumen of said reducer subassembly and concentrically aligned with the long central axis of said cannula, said tubular means having a first end located near the inner surface of said first seal means which restricts the inward movement and collapse of said lips of said first seal means when an instrument is withdrawn through the lumen of said cannula, wherein when an instrument passes through said lumen of said cannula it first comes into contact with the internal edge of said two lips which absorbs the trauma of said contact and parts thereby protecting said external edges so that said first seal means will form a substantially gas-leakproof seal after said instrument is removed.

이 특허를 인용한 특허 (107) 인용/피인용 타임라인 분석

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[미국특허] Cannula valve and seal system 원문보기

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