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US 5,205,824 AGranted
Retractable syringe with a closed barrel
OwnerMatthew S. Mazurinventor
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.
Claims42
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, said shaft having a pair of spaced collars along its length for locking the shaft in the inserted position in the rearward end of the barrel, the rearward end of said barrel having a lip at the open end with a diameter slightly smaller than the diameter of the collars, said lip moving over one of said collars to be locked between the collars;
- 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;
- said piston and needle holder having engaging means for 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;
- and
- said shaft being breakable along its length with the broken end of the shaft inserted into the forward end of the barrel holding the needle holder and needle in the retracted position.
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, said shaft having a portion along its length that is comprised of a pair of aligned lath members spaced across the diameter of the cross section of said shaft, with the inner edge surfaces being spaced from the cross sectional center of said shaft, whereby said shaft may be broken by moving the rear end of said shaft in a direction normal to the alignment of said two members;
- 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;
- said piston and needle holder having engaging means for 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, with the broken end of the shaft inserted into the forward end of the barrel holding the needle holder and needle in the retracted position.
1 more element
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, said shaft comprising a plurality of longitudinal members joined at adjacent surfaces to provide a composite cross-section that extends in two dimensions, increasing lateral stability of the shaft;
- 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;
- said piston and needle holder having engaging means for 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;
- and
- said shaft being breakable along its length with the broken end of the shaft inserted into the forward end of the barrel holding the needle holder and needle in the retracted position.
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, said piston having an outer rectangular shaped circumferential slot with an O-ring having a substantially rectangular cross-section and a rearward edge surface canted radially inward, said O-ring positioned in said slot fitting against the inner surface of said barrel for forming a movable seal;
- 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;
- said piston and needle holder having engaging means for 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;
- and
- said shaft being breakable along its length with the broken end of the shaft inserted into the forward end of the barrel holding the needle holder and needle in the retracted position.
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 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, said needle holder having a rearward circumferential slot, the forward end of said piston having fingers, each said finger having an inward projection for fitting into said circumferential slot for securing said piston to said needle holder, said needle holder having an internal fluid passageway communicating with said needle, said fluid passageway having an end on said circumferential slot;
- a second passageway comprising a single chamber with an opening in said slot;
- the ends of said fingers having arcuate surfaces for providing open spaces in said slot;
- said shaft having indication means for orienting said arcuate surfaces on said fingers to expose and not cover said passageway;
- said piston being movable in said barrel for pulling the needle holder out of said releasable connection to the retracted position;
- and
- said shaft being breakable along its length with the broken end of the shaft inserted into the forward end of the barrel holding the needle holder and needle in the retracted position.
5 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, the forward end of said piston having fingers with inwardly directed ends,
- a needle holder and needle fitting into 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 having a grasping device that pulls the needle holder out of said resiliently contractible connection to the enclosed position in the barrel,
- said needle holder has an outer slot, a second circumferential slot rearward of said outer slot, an O-ring positioned in said second slot for radially sealing the inner barrel opening adjacent the forward end, and a third rearward circumferential slot for engaging said fingers therein,
- and the forward end of said barrel has an inward, resilient, circumferential lip that resiliently fits into said outer slot, resiliently holding the needle holder in the forward end of the barrel.
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, said shaft having an outer ring portion midway its length with a diameter slightly smaller than the inner diameter of said barrel, for stabilizing said shaft in movement in said barrel,
- a needle holder and needle fitting into 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 needle having a grasping device that grasps the end of the piston,
- the piston being movable in said barrel for pulling the needle holder out of said resilient contractible connection to an enclosed position within the barrel, and
- said rear opening in said barrel having inward projections for restricting pulling said plunger and piston out of said barrel.
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 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;
- said piston and needle holder having engaging means for 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 shaft being breakable along its length with the broken end of the shaft inserted into the forward end of the barrel holding the needle holder and needle in the retracted position;
- said piston having a circumferential slot, and said rearward open end of said barrel having an V-shaped inward ring that fits into said circumferential slot, retaining said piston in a locked retractable position in said open end;
- said circumferential slot in said piston having a pair of adjacent outer side edges that fit against each side of the inward ring providing a fluid seal therebetween.
4 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, said piston having a circumferential slot, and said rearward open end of said barrel having an inward projection;
- and the radial outer surface of the rearward end of said piston having a larger diameter than the inner diameter of the projection in the rear open end of said barrel, for preventing said inner rim surface from fitting into the rear radial slot;
- 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;
- said piston and needle holder having engaging means for 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;
- and
- said shaft being breakable along its length with the broken end of the shaft inserted into the forward end of the barrel holding the needle holder and needle in the retracted position.
4 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 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, 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, said piston and needle holder having engaging means for 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;
- and
- said shaft being breakable along its length with the broken end of the shaft inserted into the forward end of the barrel holding the needle holder and needle in the retracted position.
4 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, said forward end of said syringe barrel having inward projections;
- a needle holder and needle, said needle holder having a slot, said inward projections of said syringe barrel fitting into said slot 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;
- said piston and needle holder having engaging means for 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;
- and
- said shaft being breakable along its length with the broken end of the shaft inserted into the forward end of the barrel holding the needle holder and needle in the retracted position.
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, said piston having an outer circumferential slot with an O-ring positioned in said slot fitting against the inner surface of said barrel for forming a movable seal, said barrel having metering marks along the length thereof that coact with one of the edge surfaces of said outer radial space of said O-ring for providing metering indication of fluid in said barrel;
- 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;
- said piston and needle holder having engaging means for 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;
- and
- said shaft being breakable along its length with the broken end of the shaft inserted into the forward end of the barrel holding the needle holder and needle in the retracted position.
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 fitting into the forward end of the barrel in a 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 engaging means that interconnects the piston and the needle holder, whereby pulling the piston towards said rearward end pulls the needle holder out of said resiliently contractible connection to the enclosed barrel,
- said piston has an outer circular slot with an O-ring positioned in said slot, said O-ring having a split outer radial surface with at least a pair of spaced wiping surfaces separated by an inward space therebetween, and
- said O-ring fitting against the inner surface of said barrel forming a movable seal.
2 more elements
Dependencies are inferred from the claim text.