| 摘要 |
<p>This invention is a vascular introducer sheath (12) including a shaft (16), and a hemostasis valve assembly (18) connected to the proximal end thereof. The hemostasis valve assembly (18) includes a hub, a cap and a normally-flat gasket disposed therebetween. Both the hub (22), and the cap (24) include continuous curved contact surfaces facing the top (38), and bottom (34) surfaces of the gasket (26). The continuous contact surfaces (32, 36) may be flat or gently curved, and may be smooth or include a means to grip the gasket (26). At least one of the contact (26) surfaces is formed at an angle to cause the gasket to become convex or concave in response to compression between the hub (22), and the cap (24). The continuous contact surfaces (32, 36) uniformly distribute forces onto the perimeter of the gasket (26) to avoid stress concentration points that may compromise gasket integrity. In addition, the continuous contact surfaces (32, 36) reduce the amount of pressure necessary to impart the curved shape of the gasket (26).</p> |
