Retention member and application thereof

Patent metadata

Field	Value
Publication number	US-9308352-B2
Application number	US-201113168135-A
Country	US
Kind code	B2
Filing date	Jun 24, 2011
Priority date	Jun 25, 2010
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

An IV catheter introducer assembly including a catheter hub defining a chamber; a tubular member extending distally from the catheter hub having a length and defining a lumen, the lumen being in fluid communication with the chamber and configured to removably receive an introducer needle. The device also including a retention member disposed within the chamber having a body having a central lumen having a longitudinal length extending along a lengthwise direction to the length of the tubular member and sized to seal against an introducer needle. The retention member including a venting channel having at least a portion formed as a conic helix traversing a surface of the retention member along a radial path to the lengthwise direction.

First claim

What is claimed is:

1. An intravenous (IV) catheter introducer assembly comprising a catheter hub having an interior surface defining an interior cavity and a retention member located inside the interior cavity and fixedly retained in an axial direction to the interior surface of the catheter hub; said retention member having an interior wall surface defining a bore having a needle located therein, said retention member having a longitudinal length of X and a venting path length comprising surface sections formed on an exterior of the retention member for venting gas of at least 2X, and wherein X is number representing a length, and wherein the needle contacts the interior wall surface defining the bore.

2. The intravenous catheter introducer assembly of claim 1 , wherein the venting path length comprises a spiral path length and is enclosed in part by the interior surface of the catheter hub.

3. The intravenous catheter introducer assembly of claim 2 , wherein the venting path length comprises a radial path length and an axial channel both formed on the exterior surface of the retention member.

4. The intravenous catheter introducer assembly of claim 1 , wherein the venting path length comprises a spiral path length formed on an exterior surface and an interior surface of the retention member.

5. The intravenous catheter introducer assembly of claim 1 , further comprising:
a tubular member extending distally from the catheter hub and defining a lumen, the lumen being in fluid communication with the interior cavity of the catheter hub and the tubular member extending along a lengthwise axis; and
a needle hub attached to a proximal end of the needle and the needle extending through the lumen of the tubular member.

6. The intravenous catheter introducer assembly of claim 5 , wherein the retention member comprises a plurality of base walls of increasing diameters from a distal end towards a proximal direction.

7. The intravenous catheter introducer assembly of claim 5 , wherein the retention member comprises a plurality of base walls of decreasing diameters from a proximal end towards a distal direction formed on an interior surface thereof.

8. The intravenous catheter introducer assembly of claim 5 , further comprising a retention washer having a conical surface in contact with the retention member.

9. The intravenous catheter introducer assembly of claim 5 , further comprising a needle guard disposed in the interior cavity of the catheter hub to cover a needle tip of the needle.

10. The intravenous catheter introducer assembly of claim 1 , wherein the venting path length is at least 3X and comprises a non-linear vent path formed along an exterior surface of the retention member.

11. An intravenous (IV) catheter introducer assembly comprising:
a catheter hub having an exterior surface and an interior surface defining an interior cavity;
an introducer needle comprising a sharp distal tip, a shaft, and a proximal end attached to a needle hub;
a tubular member extending distally from the catheter hub having a length and a lumen having the introducer needle disposed therein; and
a retention member disposed within the interior cavity of the catheter hub, said retention member having a body having a central lumen sealed against the introducer needle, the retention member having a surface feature formed as a conic helix traversing on an exterior surface of the retention member defining a vent path.

12. The catheter introducer assembly of claim 11 , wherein a proximal surface of the retention member comprises a plurality of base walls of decreasing diameters from a proximal end to a distal end of the retention member.

13. The catheter introducer assembly of claim 11 , wherein the vent path comprises a venting channel length greater than a longitudinal length of the retention member.

14. The catheter introducer assembly of claim 13 , wherein the venting channel length is greater than 120% of the longitudinal length of the retention member.

15. The catheter of device of claim 13 , wherein the venting channel length is about 25 mm to about 45 mm in length.

16. The catheter introducer assembly of claim 11 , wherein the central lumen comprises a distal surface diameter, an internal diameter and a proximal surface diameter.

17. A method for assembly a catheter assembly comprising:
mounting a needle comprising a needle tip, a shaft, and a proximal end to a needle hub;
mounting a catheter tube with a lumen to a catheter hub, the catheter hub comprising an interior surface defining an interior cavity;
fixing a retention member in the interior cavity of the catheter hub so that the retention member is fixed from moving along an axial direction, the retention member comprising a bore, a distally facing surface, and a proximally facing surface;
placing the needle through the bore of the retention member and through the lumen of the catheter tube; and
wherein the retention member comprises a longitudinal length of X and a venting path length formed on an exterior surface thereof of at least 2X, and wherein X is number representing a length.

18. The method of claim 17 , further comprising mounting a retention washer inside the interior cavity of the catheter hub adjacent the retention member.

19. The method of claim 18 , further comprising engaging the retention washer to a bump formed on the interior surface of the catheter hub.

20. The method of claim 17 , further comprising placing a tip protector on the needle to cover the needle tip when removing the needle in a proximal direction.

21. The method of claim 17 , wherein the venting path length is at least 3X and comprises a non-linear vent path formed along the exterior surface of the retention member.

Assignees

• Teoh Teng Sun
• Ng Chai Wayne
• Zakaria Mohd Zairizal Bin
• Chng Hang Khiang
• Braun Melsungen Ag

Inventors

• Teoh Teng Sun
• Ng Chai Wayne
• Zakaria Mohd Zairizal Bin
• Chng Hang Khiang

Classifications

• A61M25/0618

  having means for protecting only the distal tip of the needle, e.g. a needle guard · CPC title

• A61M25/0014

  Connecting a tube to a hub · CPC title

• A61M25/0097

  characterised by the hub (connectors A61M39/10) · CPC title

• A61M25/0606 Primary

  "Over-the-needle" catheter assemblies, e.g. I.V. catheters · CPC title

• A61M25/0693

  Flashback chambers · CPC title