Rigid needle shield
First Claim
1. A shield for a hypodermic syringe assembly which includes a sheath/needle sub-assembly having a resilient sheath covering a distal portion of a needle cannula, said shield comprising:
- a relatively rigid housing forming an elongate chamber therein said chamber forming an open proximal end, and said chamber and said open proximal end having cross-sectional areas sized to allow the sheath/needle sub-assembly to be inserted through said open proximal end and into said chamber, said relatively rigid housing further forming a pair of slots extending longitudinally along said shield from said open proximal end thereof, said slots extending through said housing into said chamber, and said slots being located at opposite positions in said chamber; and
retention means formed as a part of said housing for holding the sheath in said chamber and for preventing separation of the sheath from said shield when the needle cannula is removed from the sheath;
whereby said shield is easily positionable over the sheath/handle sub-assembly, and the sheath, when engaged within said shield, is easy removed from the needle cannula by exerting a gripping force on said housing near said open proximal end thereof to resiliently deform said housing to form an effective cross-sectional area of said chamber which is less than the cross-sectional area of the sheath, and withdrawing said shield from the needle cannula.
3 Assignments
0 Petitions
Accused Products
Abstract
The present invention relates to a shield for use on a prefilled hypodermic syringe assembly. The shield is intended to be retrofitable over a sheath/needle sub-assembly of the hypodermic syringe assembly in such a manner that insertion of the sheath/needle sub-assembly into the shield can be simply and easily accomplished by a medical worker, and subsequent extraction of the sheath from the shield is prevented by retention members which are formed from the housing of the shield, and which protrude into the chamber to hold the sheath. The retention member are formed so as to allow the sheath to be slidable into the chamber of the shield, yet engage the exterior surface of the sheath to resist extraction thereof once the sheath has engaged the retention members.
-
Citations
45 Claims
-
1. A shield for a hypodermic syringe assembly which includes a sheath/needle sub-assembly having a resilient sheath covering a distal portion of a needle cannula, said shield comprising:
-
a relatively rigid housing forming an elongate chamber therein said chamber forming an open proximal end, and said chamber and said open proximal end having cross-sectional areas sized to allow the sheath/needle sub-assembly to be inserted through said open proximal end and into said chamber, said relatively rigid housing further forming a pair of slots extending longitudinally along said shield from said open proximal end thereof, said slots extending through said housing into said chamber, and said slots being located at opposite positions in said chamber; and retention means formed as a part of said housing for holding the sheath in said chamber and for preventing separation of the sheath from said shield when the needle cannula is removed from the sheath; whereby said shield is easily positionable over the sheath/handle sub-assembly, and the sheath, when engaged within said shield, is easy removed from the needle cannula by exerting a gripping force on said housing near said open proximal end thereof to resiliently deform said housing to form an effective cross-sectional area of said chamber which is less than the cross-sectional area of the sheath, and withdrawing said shield from the needle cannula. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
-
20. A method of using a shield for a hypodermic syringe assembly which includes a sheath/needle sub-assembly having a resilient sheath covering the distal portion of a needle cannula, the sheath including a relatively rigid housing forming an elongate chamber therein, the chamber having an open proximal end and a retention means including at least one retention member located within the elongate chamber away from the chamber open end and formed as a part of the housing, for holding the sheath within the chamber and for preventing separation of the sheath from the chamber when the needle cannula is removed, the relatively rigid housing further including a pair of slots extending longitudinally along the shield from the open proximal end thereof, the slots extending through the housing into the chamber, and the slots being located at opposing positions in the chamber, said method of using the shield comprising the steps of:
-
inserting the sheath/needle sub-assembly through the open proximal end of the chamber until the sheath engages with the retention means; removing the sheath from the needle cannula by exerting a gripping force on the housing near the open proximal end thereof to resiliently deform the housing to form an effective cross-sectional area of the chamber which is less than the cross-sectional area of the sheath and removing the shield from the needle cannula while the retention means holds the sheath in place therein. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
-
-
29. A shield for a hypodermic syringe assembly which includes a sheath/needle sub-assembly having a resilient sheath covering a distal portion of a needle cannula, said shield comprising:
-
a relatively rigid housing forming an elongate chamber therein, said chamber forming an open proximal end, and said chamber and said open proximal end having cross-sectional areas sized to allow the sheath/needle sub-assembly to be inserted through said open proximal end and into said chamber, said relatively rigid housing further forming a pair of slots extending longitudinally along said shield from said open proximal end thereof, said slots extending through said housing into said chamber, and said slots being located at opposing positions in said chamber; and retention means formed as a part of said housing for holding the sheath in said chamber and for preventing separation of the sheath from said shield when the needle cannula is removed from the sheath; whereby said shield is easily positionable over the sheath/needle sub-assembly, and the sheath, when engaged within said shield, is easily removed from the needle cannula by exerting a gripping force on said housing near said open proximal end thereof to resiliently deform said housing to form an effective cross-sectional area of said chamber which is less than the cross-sectional area of the sheath, and withdrawing said shield from the needle cannula. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
-
Specification