Combined syringe and needle shield and method of manufacture
First Claim
1. In combination,(a) a syringe comprising a barrel having distal and proximal ends, a plunger slidable within the barrel, and a needle attached to the distal end of the barrel,(b) a collar having distal and proximal ends at the distal end of said barrel and including a plurality of locking slots on its outer surface, each of said locking slots being formed by a pair of opposing walls on the distal portion of said collar and a protrusion at the back of the locking slot extending along the proximal portion of said collar, at least one of said pair of opposing walls including a ramp shaped wall surface thereon,(c) an elongated needle shield movable over said barrel and collar between a retracted position in which the needle is exposed and an extended position in which said shield covers said needle, said shield including a plurality of elongated keys on its interior surface, each of said keys having distal and proximal ends and being adapted to slide in a keyway displaced circumferentially from said locking slots and wherein at least one of said keys on said shield is rotatable over said wall surface into at least one of said locking slots when said shield is in its extended position, and(d) retaining means on said collar and shield for retaining said shield in its retracted position.
3 Assignments
0 Petitions
Accused Products
Abstract
A safety syringe including a needle shield which is movable between a retracted position wherein protected. The needle shield is also rotatable in either direction from the releasable extended position to a locked and extended position. A collar having a plurality of protrusions and locking slots thereon is mounted on the distal end of the syringe to interact with a plurality of elongate keys which extend inwardly from the interior surface of the needle shield.
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Citations
30 Claims
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1. In combination,
(a) a syringe comprising a barrel having distal and proximal ends, a plunger slidable within the barrel, and a needle attached to the distal end of the barrel, (b) a collar having distal and proximal ends at the distal end of said barrel and including a plurality of locking slots on its outer surface, each of said locking slots being formed by a pair of opposing walls on the distal portion of said collar and a protrusion at the back of the locking slot extending along the proximal portion of said collar, at least one of said pair of opposing walls including a ramp shaped wall surface thereon, (c) an elongated needle shield movable over said barrel and collar between a retracted position in which the needle is exposed and an extended position in which said shield covers said needle, said shield including a plurality of elongated keys on its interior surface, each of said keys having distal and proximal ends and being adapted to slide in a keyway displaced circumferentially from said locking slots and wherein at least one of said keys on said shield is rotatable over said wall surface into at least one of said locking slots when said shield is in its extended position, and (d) retaining means on said collar and shield for retaining said shield in its retracted position.
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2. In combination:
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(a) a syringe comprising a barrel, a plunger slidable within the barrel, and a needle attached to the forward end of the barrel, (b) a collar at the forward end of said barrel and including a plurality of locking slots on its outer surface, each of said locking slots being formed by a pair of opposing walls on the forward portion of said collar and a protrusion at the back of the locking slot, at least one of said pair of opposing walls including a ramp shaped wall surface thereon, (c) an elongated needle shield movable over said barrel and collar between a retracted position in which the needle is exposed and an extended position in which it covers said needle, said shield including a plurality of elongated keys on its interior surface, each of said keys being adapted to slide in a keyway displaced circumferentially from said locking slots and wherein at least one of said keys on said shield is rotatable over said wall surface into at least one of said locking slots when said shield is in its extended position, and (d) a retaining means on said collar and shield for retaining said shield in its retracted position, and wherein each of said opposing walls includes a ramp shaped wall surface so that each of said keys can be rotated in either direction into said locking slots.
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15. In combination,
(a) a syringe comprising a barrel, a plunger slidable within the barrel, and a needle attached to the forward end of the barrel, (b) a collar attached to the forward end of said barrel, said collar including a plurality of locking slots rectangular in cross-section on its outer surface, each of said locking slots comprising a pair of opposing walls each in the form of a ramp, said collar further including and a triangular protrusion at the proximal end of and terminating the locking slot, the apex of each triangular protrusion extending proximally, with at least one protrusion including a detent slot, (c) an elongated needle shield movable over said barrel and collar between a retracted position in which the needle is exposed and an extended position in which it covers said needle, said shield including a plurality of elongated keys on its interior surface, each of said keys being substantially rectangular in cross-section and including a triangular shaped front end and being adapted to slide in a keyway between said protrusions, each of said keys being rotatable into a locking slot over one of said ramps when said shield is in its extended position, and (d) at least one detent on said shield for retaining said shield in its retracted position when it is positioned in one of said at least one detent slots in said protrusions.
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26. A medical device comprising, in combination:
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a barrel having distal and proximal ends; a needle extending from the distal end of said barrel and terminating in a point; a shield longitudinally movable on said barrel between a retracted position in which the needle is exposed and an extended position in which the needle point is covered; means on the barrel and shield for rotationally orienting the shield on the barrel in at least one unlocked and extended position when the shield is moved longitudinally to the extended position; means on the barrel and shield, responsive to rotation of the shield on the barrel from the unlocked and extended position to a locking position, for preventing rotation of the shield on the barrel to the unlocked and extended position; stop means being disposed on the barrel and shield so that when the shield is in the extended, locked position the stop means are aligned for abutment to prevent movement of the shield toward the retracted position and when the shield is in the extended, unlocked position the stop means are not aligned for abutment, thereby allowing movement of the shield toward the retracted position; wherein said stop means includes (a) at least one locking slot defined by a pair of opposing walls on the barrel and a protrusion at the proximal end of the locking slot and (b) at least one elongated key on the interior surface of the shield, said key being rotatable over said ramp into said locking slot, and wherein each of said opposing walls includes a ramp so that said key can be rotated in either direction into the locking slot.
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27. In combination,
(a) a syringe comprising a barrel, a plunger slidable within the barrel, and a needle attached to the forward end of the barrel, (b) a collar attached to the forward end of said barrel, said collar including at least one locking slot on its outer surface, said at least one locking slot comprised of a pair of opposing walls at least one of which is in the form of a ramp, said collar further including a plurality of protrusions at the proximal end of said locking slot, (c) an elongated needle shield movable over said barrel and collar between a retracted position in which said needle is exposed and an extended position in which said shield covers said needle, said shield including at least one elongated key on its interior surface, said at lest one key being substantially rectangular in cross-section being adapted to slide in a keyway between said protrusions, said at least one key being rotatable into a locking slot over one of said ramps when said shield is in its extended position, and (d) at least one detent on said shield for retaining said shield in its retracted position when said at least one detent is positioned adjacent one of said protrusions.
- 28. A method of assembling a safety syringe, comprising placing a protective shield having one or more elongated keys on its interior surface over the distal end of a syringe and then inserting a cylindrical collar having locking slots and keyways between the locking slots between the shield and the barrel of the syringe and positioning the shield relative to the collar so that the keys fall within the keyways on the collar and then securing the collar to the shield and syringe.
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30. A method of assembling a safety syringe comprising placing a protective shield having one or more elongated keys on its interior surface over a cylindrical collar having locking slots and keyways between the locking slots such that the protective shield is operatively positioned with respect to the cylindrical collar and the combination of the shield and collar together are then pushed onto the barrel of a conventional syringe.
Specification