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US 5,401,246 AGranted
Retractable syringe with a closed barrel
AssigneeU.S. Medical Instruments, Inc.
InventorsMatthew S. Mazur, Carlos H. Manjarrez
Life of this patent
Estimating the term…
Abstract
A retractable syringe that pulls the needle and holder from a fluid sealed releasable connection in the open forward end of the syringe barrel to a position enclosed within the barrel. A clip may lock the holder to the barrel to prevent release. The piston shaft may then be broken off at the piston and the free end of the shaft inserted through the now open forward end of the syringe barrel, enclosing and sealing the needle holder and the remaining fluid in the barrel, with the shaft holding the needle from longitudinal movement within the barrel. The syringe can then be disposed of without allowing access to the needle or having fluid leakage.
Claims64
A retractable syringe comprising:
- a syringe barrel having an internal chamber with open forward and rearward ends and a piston and shaft in the barrel with one end of the shaft extending out the rearward open end;
- a needle holder and needle releasably held in the forward end of the barrel in a first position in which the needle holder projects partially out of the open forward end of the barrel;
- said piston being longitudinally movable in said barrel for retracting the needle holder from said first position to a retracted position in which the barrel encloses the needle holder and needle;
- said piston and needle holder having interengageable means for selectively securing said piston to said needle holder, said interengageable means being provided on a forward abutting end of said piston and a rearward abutting end of said needle holder, one of said abutting ends having a central recess and the other end having a projection for releasable snap engagement in said recess;
- and
- said recess having an internal circumferential groove and said projection having a flexible substantially annular lip for engaging said groove, said lip having an outer perimeter having a diameter, said groove having a diameter less than said diameter of said outer perimeter of said lip, and said outer perimeter of said lip being deflected in an angular direction when said lip is engaged in said groove.
3 more elements
A retractable syringe, comprising:
- a syringe barrel with open forward and rearward ends and a piston and shaft in the barrel with one end of the shaft extending out the rearward open end;
- a needle holder and needle releasably held in the forward end of the barrel in a resiliently interengageable connection that holds the needle holder from longitudinal movement toward the rearward end to a position where the barrel encloses the needle holder and needle, said interengageable connection comprising a circumferential groove and an annular lip that resiliently fits into said groove, resiliently holding the needle holder in the forward end of the barrel;
- said piston and needle holder having interengageable formations for selectively securing the needle holder to the piston for pulling the needle holder out of said resiliently interengageable connection to the enclosed position in the barrel;
- and
- said piston having an outer circumferential slot with a split O-ring positioned in said slot, said split O-ring having a pair of separate outer resilient circumferential contacts between said split O-ring and the inner surface of said barrel, and said split O-ring fitting against the inner surface of said barrel forming a movable seal.
2 more elements
A retractable syringe, comprising:
- a syringe barrel with open forward and rearward ends and a piston and shaft in the barrel with one end of the shaft extending out the rearward open end;
- a needle holder and needle releasably held in the forward end of the barrel in a first position in which the needle holder projects partially out of the open forward end of the barrel;
- said needle holder and forward end of said barrel have interacting key and slot means for locking the needle holder against rotating movement in the forward end of the barrel, said key and slot means comprising a plurality of circumferentially spaced, radially inwardly projecting tabs on said barrel, and a plurality of circumferentially spaced, radially outwardly projecting tabs on said needle holder, the spacing between said tabs on said barrel defining a plurality of grooves for meshing with said tabs on said needle holder;
- said piston and needle holder having interengageable means for selectively securing said piston to said needle holder;
- and
- said piston being longitudinally movable in said barrel for retracting said needle holder from said first position to a retracted position in which said barrel encloses said needle holder and needle.
3 more elements
Dependencies are inferred from the claim text.