Introducer sheath and methods of making
An introducer sheath and methods of making the introducer sheath are described. The introducer sheath may include a hub portion and a tubular portion. The hub portion may include a substantially non-planar valve portion in a relaxed state. The valve portion may include an aperture configured to receive a medical device. A hub portion may be formed using a forming device. An aperture may be formed through a distal surface of the valve portion. A valve portion may be formed in a cap defining a cavity sized to elastically receive a proximal end of the hub portion.
1. A method for making an introducer sheath assembly comprising:
forming a cap having an upper portion and a sidewall portion defining a cavity;
removing a portion of the upper portion to form a valve having an inner surface forming an aperture having a tapered shape when the upper portion is in an undeformed state; and
inserting a proximal end of a hub portion into the cavity, the hub portion having an elongate tubular portion secured to a distal end thereof.
2. The method of claim 1 , wherein inserting the proximal end of a hub portion into the cavity comprises elastically deforming the cap.
3. The method of claim 1 , wherein an upper surface of the upper portion has a concave shape, and wherein removing a portion of the upper portion to form the valve further comprises:
elastically deforming the upper portion to decrease a concavity thereof; and
removing a portion of the elastically deformed upper portion to form the valve.
4. The method of claim 3 , wherein elastically deforming the upper portion to decrease a concavity thereof comprises positioning an urging member within the cavity.
5. The method of claim 4 , wherein the urging member comprises a planar upper surface engaging a lower surface of the upper portion when the urging member is positioned within the cavity.
6. The method of claim 1 , wherein the aperture narrows with distance from the hub portion.
7. The method of claim 6 , wherein the sidewall portion extends from a lower surface of the upper portion.
8. The method of claim 1 , wherein one of an outer surface of the hub portion and an inner surface of the sidewall portion defines a circumferential groove and the other of the outer surface of the hub portion and the inner surface of the sidewall portion comprises a circumferential lip, the circumferential groove positioned to receive the circumferential lip when the hub portion is positioned within the cavity.
9. The method of claim 8 , wherein the inner surface of the sidewall portion is cylindrical in the undeformed state.
10. A method for making an introducer sheath assembly comprising:
forming a cap having an upper portion and a sidewall portion defining a cavity, the upper portion defining a non-planar outer surface in a relaxed state, the outer surface defining an aperture configured to receive a medical device; and
inserting a proximal end of a hub portion into the cavity, the hub portion having an elongate tubular portion secured to a distal end thereof.
11. The method of claim 10 , wherein the outer surface is substantially concave in the relaxed state.
12. The method of claim 10 , wherein the aperture includes a sealing surface.
13. The method of claim 12 , wherein the sealing surface is not generally parallel about a longitudinal axis through the aperture in the relaxed state.
14. The method of claim 12 , wherein the sealing surface is configured to form a seal between the medical device and the hub in a deformed state.
15. The method of claim 10 , wherein the aperture is tapered.
16. The method of claim 15 , wherein the aperture has a diameter that increases with distance from the outer surface.