Hemostasis cannula

• US 20050192537A1
• Filed: 02/10/2005
• Published: 09/01/2005
• Est. Priority Date: 05/06/1992
• Status: Active Grant

• Current Assignee: Cook Medical Technologies, LLC (Cook Group Incorporated)
• Original Assignee: Cook Medical Technologies, LLC (Cook Group Incorporated)
• Inventors: Paul, Ram H., Osborne, Thomas A.
• Granted Patent: US 8,753,317 B2
• Time in Patent Office: Days
• US Class Current: 604/167.01
• CPC Class Codes: A61M 2039/0072 Means for increasing tightness of the septum, e.g. compression rings, special materials, special constructions
• CPC Class Codes: A61M 2039/062 used with a catheter
• CPC Class Codes: A61M 2039/0633 the seal being a passive seal made of a resilient material with or without an opening
• CPC Class Codes: A61M 2039/064 Slit-valve
• CPC Class Codes: A61M 39/0606 without means for adjusting the seal opening or pressure A61M39/0693 takes precedence
• CPC Class Codes: A61M 39/0693 including means for seal penetration

Abstract

A medical instrument includes a housing with a passage through which a catheter is received. A valve body is mounted in the passage, and, as the catheter penetrates through the valve body, the valve body conforms to the outer wall of the catheter to maintain a fluid tight seal between the valve body and the catheter. When the valve body is unstressed before being mounted in the passage, the valve body has a first planar dimension and a second planar dimension that is less than the first planar dimension.

Claims

1. A medical instrument comprising:

a housing having a passage through which a catheter is received; and

a valve body mounted in the passage of the housing, the valve body having a two opposing planar faces and a peripheral edge separating the faces, the valve body further having a first slit that opens in one of the planar faces and a second slit that opens in the other planar face,

the valve body conforming to the outer wall of the catheter when the catheter penetrates through the first and second slits to maintain a fluid tight seal between the valve body and the catheter,

the valve body having a first planar dimension along a first axis and a second planar dimension along a second axis, the first planar dimension being greater than the second planar dimension when the valve body is unstressed before being mounted in the passage, the first axis being generally non-parallel to the second slit.

2. The medical instrument of claim 1 wherein the valve body has a generally oval shape when unstressed.

3. The medical instrument of claim 2 wherein the second axis is non-parallel to the first slit and the second slit.

4. The medical instrument of claim 1 wherein the periphery of the valve body has generally outwardly extending regions and generally inwardly extending regions that alternate with the outwardly extending regions.

5. The medical instrument of claim 4 wherein the first dimension is the dimension between opposing outwardly extending regions and the second dimension is the dimension between opposing inwardly extending regions.

6. The medical instrument of claim 1 wherein the second axis is generally parallel to the first and second slits.

7. The medical instrument of claim 1 wherein each slit extends partly through the valve body and intersects with the other slit within the valve body to define a path between the opposing planar surfaces, the catheter being insertable through the path.

8. The medical instrument of claim 1 wherein the first and second slits are oriented at an angle with respect to each other.

9. The medical instrument of claim 8 wherein the first and second slits are perpendicular to each other.

10. The medical instrument of claim 1 wherein the housing has a recess with a dimension across the recess that is less than the first planar dimension of the valve body.

11. The medical instrument of claim 10 wherein the valve body is compressed along the first planar dimension when the valve body is received within the recess.

12. The medical instrument of claim 10 wherein the recess is a circular recess with a circular cross section.

13. The medical instrument of claim 1 wherein the valve body is made of polyisoprene.

14. The medical instrument of claim 13 wherein the polyisoprene is halogenated.

15. The medical instrument of claim 14 wherein the polyisoprene is halogenated through chlorination.

16. The medical instrument of claim 13 wherein the halogenated polyisoprene is coated with silicone fluid.