Needle guard and needle assembly for syringe
First Claim
1. 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.
2 Assignments
0 Petitions
Accused Products
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.
517 Citations
18 Claims
-
1. 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. 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. - View Dependent Claims (14, 15, 16, 17, 18)
-
Specification