Back to results
US 5,308,329 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, with the piston shaft then being 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.
Claims53
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 and needle holder having engageable means for selectively securing the piston to the needle holder;
- said piston being 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 shaft being breakable along its length
- said needle holder having a first circumferential slot;
- said forward opening of said barrel having a circumferential lip;
- said lip fitting in said slot for releasably securing said needle holder in a releasable position;
- said needle holder having a second circumferential slot rearward of said first circumferential slot;
- and
- an O-ring positioned in said slot for resiliently sealing the inner barrel opening adjacent the forward end.
8 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 releasable held in the forward end of the barrel in a resiliently contractible connection that resiliently holds the needle holder from movement toward the rearward end to a position where the barrel encloses the needle holder and needle;
- 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 contractible connection to the enclosed position in the barrel;
- said needle holder has an outer slot;
- and
- the forward end of said barrel has an inward, resilient, circumferential lip that resiliently fits into said slot, resiliently holding the needle holder in the forward end of the barrel.
3 more elements
A retractable syringe comprising:
- a syringe barrel with open forward and rearward ends and a plunger in the barrel with one end of the plunger for extending out the rearward open end;
- a needle holder for being releasably connected into the forward end of the barrel with a forward portion of said needle holder projecting out of said barrel;
- said plunger has means that locks to said needle holder, whereby rearward movement of said plunger moves said needle holder from said releasable connection to an enclosed position in said barrel;
- separate locking means for locking movement of said needle holder from said releasable connection;
- said needle holder having a groove in said forward portion;
- and
- said locking means comprising an arcuate locking clip for releasable snap engagement in said groove.
4 more elements
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 fitting into the forward end of the barrel in a releasable connection that releases the needle holder for movement toward the rearward end and to a retracted position where the barrel encloses the needle holder and needle, and the forward end of the barrel is open;
- the needle holder having an axial passageway for connecting said needle to said barrel chamber;
- said piston and needle holder having engaging means for selectively securing the piston to the needle holder;
- said piston being movable in said barrel for pulling the needle holder out of said releasable connection to the retracted position;
- said engaging 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 aligned with said axial passageway and the other end having a projection for releasable snap engagement in said recess;
- and
- a lock comprising a clip hinged at one end to the forward end of said barrel for pivotal movement about said hinged end between a locked position and a released position for selectively preventing movement of said needle holder with respect to said barrel, said needle holder being rearwardly movable with respect to said barrel only when said clip is in said released position.
5 more elements
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 and needle holder having engageable means for selectively securing the piston to the needle holder;
- said piston being 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;
- and
- a lock comprising a clip separable from said syringe for selectively preventing movement of said needle holder with respect to said barrel, said needle holder being rearwardly movable with respect to said barrel only when said clip is separated from said syringe.
3 more elements
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 and needle holder having engageable means for selectively securing the piston to the needle holder;
- said piston being 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;
- and
- a lock comprising a clip hinged at one end to the forward end of said barrel for pivotal movement about said hinged end between a locked position and a released position for selectively preventing movement of said needle holder with respect to said barrel, said needle holder being rearwardly movable with respect to said barrel only when said clip is in said released position.
3 more elements
Dependencies are inferred from the claim text.