Cannula flapper valve assembly

Details Cannula flapper valve assembly Cannula flapper valve assembly

1998-10-13

2000-05-23

McDermott, Corrine

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604246, 604167, 604256, 604264, 604169, 2511492, 137847, 137849, A61M 500

Patent

active

060661178

ABSTRACT:
A cannula includes a cannula cap connected to a proximal end of the cannula, which cap has cap body having a bore defining an instrument receiving passageway. A monolithic flapper valve is positioned within the cannula proximal end and adjacent the cap body. The flapper valve includes a flapper, a flapper mount positioned adjacent the cap body, and an integrally formed hinge connecting the flapper mount to the flapper for permitting the flapper to move to an open position when an instrument is positioned within the instrument receiving passageway and for biasing the flapper toward a closed position when the instrument is removed from the passageway. A sealing washer is carried by the flapper mount for positioning between the valve and the cannula cap enclosing the flapper valve within the cannula. Further, the sealing washer comprises a wedge shaped cross-section for displacing said flapper portion at an angle to said flapper mounting portion for biasing said flapper portion into a sealing relationship therewith, and thus with the instrument passageway when in an assembled position within the cannula.

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