Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1994-05-05
1995-10-17
Rosenbaum, C. Fred
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604158, 604249, A61M 5178, A61M 500, A61M 2500
Patent
active
054586402
ABSTRACT:
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.
REFERENCES:
patent: 4781702 (1988-11-01), Herrli
patent: 4917668 (1990-04-01), Haindl
patent: 4935010 (1990-06-01), Cox et al.
patent: 5156596 (1992-10-01), Balbierz et al.
patent: 5322518 (1994-06-01), Schneider et al.
patent: 5330437 (1994-07-01), Durman
patent: 5350393 (1994-09-01), Yoon
patent: 5354280 (1994-10-01), Haber et al.
Rosenbaum C. Fred
Wilkens III Frank
Woodbridge Richard C.
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