Seal for a cannula assembly
AssigneeOwens Precision Systems, Inc.
InventorsLanis P. Pfolsgraf, Gene T. Kyburz
Life of this patent
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Abstract
A self-sealing cannula assembly for maintaining pressure in a body cavity during insufflatory surgery. A cap made of elastomeric material is fitted to an enlarged portion of a cannula and has means for simultaneous sealing and fastening the cap to the cannula. The endwall of the cap may be apertured to permit entry and exit of a trocar or other surgical instrument without interruption of the seal. Another embodiment provides an elastomeric adaptor cap arranged to be fitted to the exterior circumference of the above-mentioned cap for temporary insertion and withdrawal of instruments of relatively small diameter without removal of the original cap.
Claims12
In a self-sealing cannula assembly for insufflatory surgical procedures, and wherein said cannula assembly comprises a cannula having an elongated sleeve defining a cannula passage for receiving surgical instruments therethrough and for penetrating into an operative body cavity to facilitate insertion and withdrawal of a surgical instrument while retaining said cannula in situ and while retaining gag pressure in said body cavity notwithstanding withdrawal of said surgical instrument, said cannula having a cuplike portion of enlarged cross-section disposed at its rearward end, said cuplike portion having an open-ended entrance defined by a marginal end surface for receiving the surgical instruments, the improvement comprising,
- an elastomeric cap having an endwall for enclosing said open-ended entrance of said cuplike section, said elastomeric cup having a centrally located, inwardly projecting convex area and having an inner circumference substantially conforming to the outer circumference of said cuplike portion of the cannula, said elastomeric cap further being self-retaining for seating engagement and securement with the outer circumference of said cuplike portion of the cannula to provide a gaseous seal.
Dependencies are inferred from the claim text.