Needle point protection sheath

• US 6,193,694 B1
• Filed: 02/09/2000
• Issued: 02/27/2001
• Est. Priority Date: 02/11/1999
• Status: Expired due to Term

• Current Assignee: Nxstage Medical Incorporated (Fresenius SE & Co. KGaA)
• Original Assignee: DSU Medical Corporation
• Inventors: Schnell, William J., Bell, David
• Primary Examiner(s): YASKO JR, JOHN D
• Application Number:
  US09/500,567
• Time in Patent Office: 384 Days
• Field of Search: 604/192, 604/110, 604/263, 604/198, 604/187, 604/158, 604/160, 604/161, 604/163, 604/164.08
• US Class Current: 604/192
• CPC Class Codes: A61M 25/0631 having means for fully covering the needle after its withdrawal, e.g. needle being withdrawn inside the handle or a cover being advanced over the needle
• CPC Class Codes: A61M 5/3243 being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel devices for protecting guide needles in combination with catheters A61M25/0612

Abstract

A needle point protection sheath comprises a protector tube having a bore for receiving a hollow needle plus a needle hub within the bore. The protector tube has closure cap at one end thereof and has a retention member at the other end to engage an end of the hub, to prevent the hub from passing out of the other tube end. The cap may carry a sleeve having a needle-pierceable wall at its inner end, or a mass of resilient material which is capable of being penetrated by the needle as the cap is closed, to seal the needle tip and thus prevent the spilling of blood residue when a blood collection needle is being enclosed for protection.

Claims

1. A medical fluid flow set which comprises a flexible tube having a needle hub at an end thereof, said hub carrying a hollow needle having a point, and being of enlarged transverse dimension relative to said needle;

a protector tube surrounding at least one of said tube, hub, and needle, said tube being of a length to enclose said needle, said tube defining a retention member at one end to prevent said hub from passing out of said one end, said retention member comprising a plurality of plates attached to an interior surface of said protector tube and extending radially inwardly to define a restricted aperture of a size that permits flexible tubing attached to said needle hub to extend through said aperture, said plates being angled slightly from a direction perpendicular to the protector tube longitudinal axis, whereby said flexible tubing may slide in one direction through the restricted aperture, but is substantially prevented from sliding through the restricted aperture in the direction opposed to said one direction by flexing and gripping of said plates.

2. The flow set of claim 1 in which a closure cap is provided at one protector tube end.

3. The flow set of claim 1 in which said closure cap carries a sleeve projecting inwardly of said tube when the cap is closed, said sleeve being closed at an inner end with a needle pierceable wall, whereby a tip of a needle carried within the tube can pierce said wall to enclose and at least substantially seal the needle point in the sleeve.

4. A needle point protection sheath which comprises a protector tube having a bore for receiving a hollow needle having a point within said bore and a needle hub, said protector tube having a retention member at a first end thereof to engage an end of the hub to prevent said hub from passing out of the other tube end, said retention member comprising a plurality of plates attached to an interior surface or end of said protector tube and extending radially inwardly to define a restricted aperture of a size that permits flexible tubing attached to said needle hub to extend through said aperture, said plates being angled slightly in the direction of the protector tube longitudinal axis, whereby said flexible tubing may slide in one direction through the restricted aperture, but is substantially prevented from sliding through the restricted aperture in the direction opposed to said one direction by flexing and gripping of said plates.

5. The protection sheath of claim 4 which has a closure cap at a second end thereof, said closure cap carrying a sleeve projecting inwardly of said tube when the cap is closed, said sleeve being closed at an inner end with a needle-pierceable wall, whereby a tip of a needle carried within said tube can pierce said wall to enclose and at least substantially seal the needle point in the sleeve.

6. The protection sheath of claim 5 in which a needle point sealing mass is carried on said closure cap to sealingly receive a penetrating needle point of a needle carried in said tube when the cap is closed, to seal the end of said needle.

7. The protection sheath of claim 6 in which said needle point sealing mass comprises rubber.

8. The protection sheath of claim 4 which has a closure cap at a second end thereof.

9. A needle guard carried with a set comprising a medical needle mounted on flexible tubing, said needle having a hub, said guard comprising a protector tube open at both ends with said flexible tubing extending completely through said protector tube, said protector tube having an interior large enough to receive and enclose said needle and said hub, one end of said protector tube having a retention member for engaging an end of said hub to substantially prevent withdrawal of said needle and hub from the protector tube interior through said one end, said protector tube having a longitudinal slot extending its entire length to permit application of said needle guard laterally to said flexible tubing.

10. The needle guard and set of claim 9 in which said retention member comprises a plurality of plates attached to an interior or end surface of said protector tube and extending radially inwardly to define a restricted aperture of a size that permits said flexible tubing to extend through said aperture with essentially no access space, said plates being angled slightly in the direction of the protector tube longitudinal axis, whereby said flexible tubing may slide in one direction through the restricted aperture, but is substantially prevented from sliding through the restricted aperture in a direction opposed to said one direction by flexing and gripping of said plates.