Vascular introducer sheath and hemostasis valve for use therewith
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United States of America Patent
Stats
-
Nov 27, 2001
Grant Date -
May 24, 2001
app pub date -
Sep 10, 1999
filing date -
Sep 10, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A vascular introducer sheath including a tubular shaft and a hemostasis valve assembly connected to the proximal end thereof. The hemostasis valve assembly includes a hub, a cap and a normally-flat gasket disposed therebetween. Both the hub and the cap include continuous curved contact surfaces facing the top and bottom surfaces of the gasket. The continuous contact surfaces may be flat or gently curved and may be smooth or include a means to grip the gasket. At least one of the contact surfaces is formed at an angle to cause the gasket to become convex or concave in response to compression between the hub and the cap. The continuous contact surfaces uniformly distribute forces onto the perimeter of the gasket to avoid stress concentration points that may compromise gasket integrity. In addition, the continuous contact surfaces reduce the amount of pressure necessary to impart the curved shape of the gasket.
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