Valved introducer sheath and related methods
A valved introducer sheath is used to facilitate the insertion of a flexible medical device into a body. The elongated valve of the valved introducer sheath is constructed of a foam material that is injected into the sheath and sliced longitudinally to create one or more self-sealing slits through which flexible medical devices can be passed. As a medial device is passed through the self-sealing slit(s) at a proximal end, the self-sealing slits seal around the medical device before opening at a distal end. The elongated valve is also affixed to at least some of the inner surface of the sheath. The valve will tear into halves along at least one of the self-sealing slits when the sheath is peeled.
1. A method of producing a valved sheath, comprising:
(a) providing a sheath comprising a proximal hub portion, an elongated body portion extending distally from the proximal hub portion, and a passageway extending through the proximal hub and elongated body portions;
(b) injecting a foam material into at least some of the passageway; and
(c) forming in the foam material one or more self-sealing slits, the foam material and the one or more slits serving as a valve in the passageway of the sheath.
2. The method of claim 1 wherein step (b) comprises injecting the foam material such that the length of the foam material within the passageway is greater than the width of the foam material at any point within the passageway.
3. The method of claim 1 wherein step (c) comprises forming the one or more self-sealing slits such that none of the one or more self-sealing slits extends in width to an inner surface of the sheath that defines the passageway.
4. The method of claim 1 wherein step (c) comprises forming the one or more self-sealing slits such that the one or more self-sealing slits substantially prevent the flow of gas into the passageway of the sheath.
5. The method of claim 1 further comprising providing a pair of lines extending at least some of the length, and on opposite sides, of the sheath, the sheath being separable along the lines.
6. The method of claim 1 further comprising scoring the sheath along at least some of its length.
7. The method of claim 6 wherein the scoring comprises scoring a pair of lines that extend at least some of the length, and on opposite sides, of the sheath, the sheath being separable along the lines.
8. The method of claim 1 wherein step (a) comprises providing the sheath comprising the proximal hub portion which comprises a pair of wings extending substantially perpendicular to the elongated body portion of the sheath.
9. The method of claim 1 wherein step (b) comprises injecting the foam material which comprises a closed cell foam.
10. The method of claim 1 wherein step (b) comprises injecting the foam material such that the foam material becomes affixed to a portion of an inner surface of the sheath that defines the passageway.