US 5,360,404 A · Needle guard and needle assembly for syringe

Abstract

The syringe includes a plunger and an adapter carrying a needle, the adapter being threaded into the end of the barrel for withdrawal, upon connection with the plunger and together with the needle, into the interior of the barrel. To prevent the adapter from unseating from the barrel end before or during use, the needle guard and hub are connected to enable axial pressure from the needle guard to be transmitted through the hub to the adapter to attach the hub to the adapter. Cooperating surfaces on the needle guard and needle hub are engageable to enable a torque to be applied to the adapter only in a direction opposite to the direction of rotation of the adapter during unseating. To the extent rotation of the needle guard in the opposite direction applies a torque to the adapter, that torque is insufficient to unseat the adapter from the barrel end.

Claims18

Dependent claims

Apparatus for releasably securing a needle to an end portion of a syringe comprising:

a needle hub having a needle projecting from one end thereof and a passage through said needle for transmission of a fluid, said needle hub having a surface for engaging the end portion of the syringe;
and
a needle guard including a sleeve closed at one end and open at its opposite end for receiving said needle and a portion of said needle hub within said sleeve;
said needle guard and said needle hub having cooperable surfaces, respectively, configured to transmit a torque applied to said needle guard in a first direction to said needle hub and to enable relative rotation of said needle guard and said needle hub without transmission of substantial torque from said needle guard to said needle hub when a torque is applied to said needle guard in a second direction opposite said first direction.

1 more element

Apparatus for releasably securing a needle to a fitting at one end of a syringe comprising:

a needle hub having a needle projecting from one end thereof and a passage through said needle for transmission of a fluid, said needle hub having a surface for engaging the fitting of the syringe when the hub is secured to the fitting;
a needle guard including a sleeve closed at one end and open at its opposite end for receiving said needle and at least a portion of said needle hub within said sleeve;
a first pair of cooperable surfaces on said needle hub and said needle guard, respectively, and engageable with one another for enabling a force applied to said needle guard in a first axial direction to be transmitted to said hub for securing said needle hub and the syringe fitting to one another;
and
a second pair of cooperable surfaces on said needle hub and said needle guard, respectively, and engageable with one another for enabling a force applied to said needle guard in a second axial direction opposite said first axial direction to be positively transmitted to said hub for removing said needle hub from the syringe fitting.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

08/136,201Filed 15 Oct 1993 · continuation in part

Priority

14 Dec 1988

Granted

1 Nov 1994

Term ends

Not estimatedThe source records don’t support an estimate.

Classification16 codes

A61M 5/5086
Having means for preventing re-use, or for indicating if defective, used, tampered with or unsterile: for indicating if defective, used, tampered…
A61M 5/3202
Needles; Details of needles pertaining to their connection with syringe or hub ; Accessories for bringing the needle into, or holding the needle…:…
A61M 5/322
Means for protection against accidental injuries by used needles: retractable needles, i.e. disconnected from and withdrawn into the syringe…
A61M 5/002
Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning…:…

Family

Serial285,012Parent of this continuation-in-part · filed 14 Dec 1988

Serial327,344Parent of this continuation-in-part · filed 22 Mar 1989

Serial410,318Parent of this continuation-in-part · filed 21 Sep 1989

Serial607,127Parent of this continuation-in-part · filed 3 Oct 1990

Serial687,108Parent of this division · filed 18 Apr 1991

US 5,030,208 AParent of this continuation-in-part · filed 9 Jun 1991

Serial800,849Parent of this continuation-in-part · filed 29 Nov 1991

US 5,112,318 AParent of this division · filed 12 May 1992

US 5,122,124 AParent of this continuation-in-part · filed 16 Jun 1992

Serial909,385Parent of this continuation-in-part · filed 9 Jul 1992

US 5,205,827 AParent of this continuation-in-part · filed 27 Apr 1993

US 5,263,933 AParent of this continuation-in-part

US 5,360,404 AThis patent

From the US filing history. Foreign family members aren’t listed.

Needle guard and needle assembly for syringe

Life of this patent

Needle guard and needle assembly for syringe

Life of this patent

Abstract

Claims18