Locking syringe

Claim 2

A locking syringe, comprising: a cylinder having an open, cylindrical passage, said cylinder including a distal end having a first plunger locking member, and a proximal end adapted to hold a needle, said proximal end of said cylinder including a first cap locking member; a plunger comprising a shaft having a proximal end and a distal end wherein said distal end includes a second plunger locking member, said second plunger locking member comprising a second set of annular ridges, said second plunger locking member is matable with said first plunger locking member on said cylinder when said plunger is inserted in said cylinder, thereby prohibiting removal of said plunger from said cylinder; said first plunger locking member comprising a first set of annular ridges which further include a plurality of channels formed therethrough to facilitate insertion of a plunger into said cylinder; a cap having a wide opening and a length sized to cover a needle which may be carried on said cylinder, said cap including a second cap locking member which engages said first cap locking member on said proximal end of said cylinder, thereby preventing reuse of said needle carried on said cylinder.

Claim 3

A locking syringe, comprising: a cylinder having an open, cylindrical passage, said cylinder including a distal end having a first plunger locking member and a proximal end adapted to hold a needle and having a first cap locking member, said first cap locking member comprising a first set of annular ridges; a plunger comprising a shaft having a proximal end and a distal end wherein said distal end includes a second plunger locking member which is matable with said first plunger locking member on said cylinder when said plunger is inserted in said cylinder, thereby prohibiting removal of said plunger from said cylinder; and a cap having a wide opening and a length sized to cover a needle which may be carried on said cylinder, said cap including a second cap locking member, comprising a second set of annular ridges which engages said first cap locking member on said proximal end of said cylinder, thereby preventing reuse of said needle carried on said cylinder; wherein one of said two cap locking members further includes a plurality of tabs formed thereon and the other of said cap locking members further includes a plurality of slots formed

Claim 4

A locking syringe, comprising: a cylinder having an open, cylindrical passage, said cylinder including a distal end having a first plunger locking member and a proximal end adapted to hold a needle and having a first cap locking member, said first cap locking member comprising a first set of annular ridges; a plunger comprising a shaft having a proximal end and a distal end wherein said distal end includes a second plunger locking member which is matable with said first plunger locking member on said cylinder when said plunger is inserted in said cylinder, thereby prohibiting removal of said plunger from said cylinder; and a cap having a wide opening and a length sized to cover a needle which may be carried on said cylinder, said cap including a second cap locking member, comprising a second set of annular ridges which engages said first cap locking member on said proximal end of said cylinder, thereby preventing reuse of said needle carried on said cylinder; wherein one of said two cap locking members further includes a plurality of tabs formed thereon and the other of said cap locking members further includes a plurality of slots formed

Claim 5

A syringe comprising: a plunger having a first locking member formed at the distal end thereof, said first locking member comprising a set of annular ridges; a cylinder having a proximal end adapted to hold a needle and a distal end having a second locking member adjacent thereto, said second locking member comprising a second set of annular ridges having a plurality of longitudinal channels formed therethrough to facilitate insertion of said plunger into said cylinder, and said first locking member matable with said second locking member when said plunger is fully inserted into said cylinder to lock said plunger in said cylinder, thereby preventing reuse of said syringe.

Claim 6

A syringe comprising: a plunger having a first locking member formed at the distal end thereof, said first locking member comprising a set of annular ridges; a cylinder having a proximal end adapted to hold a needle and a distal end having a second locking member adjacent thereto, said second locking member comprising a second set of annular ridges having a plurality of longitudinal channels formed therethrough to facilitate insertion of said plunger into said cylinder, and said first locking member matable with said second locking member when said plunger is fully inserted into said cylinder to lock said plunger in said cylinder, thereby preventing reuse of said syringe.

Claim 7

A locking syringe, comprising: a syringe body having: a distal end, an open cylindrical passage, a first plunger locking member located only adjacent the distal end of said cylindrical passage, said first plunger locking member comprising a set of annular ridges having a plurality of channels formed therethrough, and a proximal end adapted to hold a needle and having a first cap locking member, said cylindrical passage being otherwise free of locking members; a plunger comprising a shaft having a proximal end and a distal end, and a second plunger locking member comprising a set of annular ridges located only adjacent the distal end of said shaft, which second plunger locking member is matable with said first plunger locking member on said cylinder when said plunger is inserted in said cylinder, thereby prohibiting removal of said plunger from said cylinder, said plunger being otherwise free of locking members; a thrust plate affixed to the distal end of said shaft beyond the second plunger locking member, said thrust plate being of sufficient size to extend laterally beyond the perimeter of the distal end of said cylindrical passage such that when said plunger is fully inserted into said syringe body, said thrust plate is located outside of said syringe body; and a longitudinally tapered cap having a wide opening at one end thereof and a length sized to cover a needle which may be carried on said cylinder, said cap including a second cap locking member which engages said first cap locking member on said proximal end or said cylinder, thereby preventing reuse of said needle carried on said cylinder.

Claim 8

A locking syringe, comprising: a syringe body having: a distal end, an open cylindrical passage, a first plunger locking member located only adjacent the distal end of said cylindrical passage, said first plunger locking member comprising a set of annular ridges having a plurality of channels formed therethrough, and a proximal end adapted to hold a needle and having a first cap locking member, said cylindrical passage being otherwise free of locking members; a plunger comprising a shaft having a proximal end and a distal end, and a second plunger locking member comprising a set of annular ridges located only adjacent the distal end of said shaft, which second plunger locking member is matable with said first plunger locking member on said cylinder when said plunger is inserted in said cylinder, thereby prohibiting removal of said plunger from said cylinder, said plunger being otherwise free of locking members; a thrust plate affixed to the distal end of said shaft beyond the second plunger locking member, said thrust plate being of sufficient size to extend laterally beyond the perimeter of the distal end of said cylindrical passage such that when said plunger is fully inserted into said syringe body, said thrust plate is located outside of said syringe body; and a longitudinally tapered cap having a wide opening at one end thereof and a length sized to cover a needle which may be carried on said cylinder, said cap including a second cap locking member which engages said first cap locking member on said proximal end or said cylinder, thereby preventing reuse of said needle carried on said cylinder.

Claim 9

A locking syringe, comprising: a syringe body having a distal end, an open cylindrical passage, a first plunger locking member located only adjacent the distal end of said cylindrical passage, and a proximal end adapted to hold a needle and having a first cap locking member, said first cap locking member comprising a set of annular ridges, said cylindrical passage being otherwise free of locking members; a plunger comprising a shaft having a proximal end and a distal end, and a second plunger locking member located only adjacent the distal end of said shaft, which second plunger locking member is matable with said first plunger locking member on said cylinder when said plunger is inserted in said cylinder, thereby prohibiting removal of said plunger from said cylinder, said plunger being otherwise free of locking members; a thrust plate affixed to the distal end of said shaft beyond the second plunger locking member, said thrust plate being of sufficient size to extend laterally beyond the perimeter of the distal end of said cylindrical passage such that when said plunger is fully inserted into said syringe body, said thrust plate is located outside of said syringe body; a longitudinally tapered cap having a wide opening at one end thereof and a length sized to cover a needle which may be carried on said cylinder, said cap including a second cap locking member which engages said first cap locking member on said proximal end of said cylinder, thereby preventing reuse of said needle carried on said cylinder; a plurality of tabs formed on one of said two cap locking members; and a plurality of slots formed in the other of said two cap locking members, wherein said slots may be aligned with said tabs to lock said cap onto said cylinder.

Claim 10

A locking syringe, comprising: a syringe body having a distal end, an open cylindrical passage, a first plunger locking member located only adjacent the distal end of said cylindrical passage, and a proximal end adapted to hold a needle and having a first cap locking member, said first cap locking member comprising a set of annular ridges, said cylindrical passage being otherwise free of locking members; a plunger comprising a shaft having a proximal end and a distal end, and a second plunger locking member located only adjacent the distal end of said shaft, which second plunger locking member is matable with said first plunger locking member on said cylinder when said plunger is inserted in said cylinder, thereby prohibiting removal of said plunger from said cylinder, said plunger being otherwise free of locking members; a thrust plate affixed to the distal end of said shaft beyond the second plunger locking member, said thrust plate being of sufficient size to extend laterally beyond the perimeter of the distal end of said cylindrical passage such that when said plunger is fully inserted into said syringe body, said thrust plate is located outside of said syringe body; a longitudinally tapered cap having a wide opening at one end thereof and a length sized to cover a needle which may be carried on said cylinder, said cap including a second cap locking member which engages said first cap locking member on said proximal end of said cylinder, thereby preventing reuse of said needle carried on said cylinder; a plurality of tabs formed on one of said two cap locking members; and a plurality of slots formed in the other of said two cap locking members, wherein said slots may be aligned with said tabs to lock said cap onto said cylinder.

Claim 11

The locking syringe defined in claim 5, wherein said tabs and slots are formed at unequal intervals around the circumference of said annular ridges.

Claim 16

A locking syringe, comprising: a syringe body having a distal end, an open cylindrical passage, a first plunger locking member located only adjacent the distal end of said cylindrical passage, a proximal end adapted to hold a needle and having a first cap locking member, said first cap locking member comprising a set of annular ridges, and a non-ridged region adjacent said first cap locking member, said cylindrical passage being otherwise free of locking members; a plunger comprising a shaft having a proximal end and a distal end, and a second plunger locking member located only adjacent the distal end of said shaft, which second plunger locking member is matable with said first plunger locking member on said cylinder when said plunger is inserted in said cylinder, thereby prohibiting removal of said plunger from said cylinder, said plunger being otherwise free of locking members; a thrust plate affixed to the distal end of said shaft beyond the second plunger locking member, said thrust plate being of sufficient size to extend laterally beyond the perimeter of the distal end of said cylindrical passage such that when said plunger is fully inserted into said syringe body, said thrust plate is located outside of said syringe body; and a longitudinally tapered cap having a wide opening at one end thereof and a length sized to cover a needle which may be carried on said cylinder, said cap including a second cap locking member comprising a set of annular ridges, and a non-ridged region adjacent said second cap locking member, wherein said second cap locking member engages said first cap locking member on said proximal end of said cylinder, thereby preventing reuse of said needle carried on said cylinder.

Claim 17

A locking syringe, comprising: a syringe body having a distal end, an open cylindrical passage, a first plunger locking member located only adjacent the distal end of said cylindrical passage, a proximal end adapted to hold a needle and having a first cap locking member, said first cap locking member comprising a set of annular ridges, and a non-ridged region adjacent said first cap locking member, said cylindrical passage being otherwise free of locking members; a plunger comprising a shaft having a proximal end and a distal end, and a second plunger locking member located only adjacent the distal end of said shaft, which second plunger locking member is matable with said first plunger locking member on said cylinder when said plunger is inserted in said cylinder, thereby prohibiting removal of said plunger from said cylinder, said plunger being otherwise free of locking members; a thrust plate affixed to the distal end of said shaft beyond the second plunger locking member, said thrust plate being of sufficient size to extend laterally beyond the perimeter of the distal end of said cylindrical passage such that when said plunger is fully inserted into said syringe body, said thrust plate is located outside of said syringe body; and a longitudinally tapered cap having a wide opening at one end thereof and a length sized to cover a needle which may be carried on said cylinder, said cap including a second cap locking member comprising a set of annular ridges, and a non-ridged region adjacent said second cap locking member, wherein said second cap locking member engages said first cap locking member on said proximal end of said cylinder, thereby preventing reuse of said needle carried on said cylinder.

Claim 18

A locking syringe, comprising: a cylinder having an open, cylindrical passage, said cylinder including a distal end having a first plunger locking member and a proximal end adapted to hold a needle and having a first cap locking member, said first cap locking member comprising a first set of annular ridges; a plunger comprising a shaft having a proximal end and a distal end wherein said distal end includes a second plunger locking member which is matable with said first plunger locking member o said cylinder when said plunger is inserted in said cylinder, thereby prohibiting removal of said plunger from said cylinder; and a cap having a wide opening and a length sized to cover a needle which may be carried on said cylinder, said cap including a second cap locking member, comprising a second set of annular ridges which engages said first cap locking member on said proximal end of said cylinder, thereby preventing reuse of said needle carried on said cylinder; wherein one of said two cap locking members further includes a plurality of tabs formed thereon and the other of said cap locking members further includes a plurality of slots formed therein, said tabs and slots being formed at unequal intervals around the circumference of said annular ridges, wherein said slots may be aligned with said tabs to further secure said cap onto said cylinder.

Claim 19

A locking syringe, comprising: a cylinder having an open, cylindrical passage, said cylinder including a distal end having a first plunger locking member and a proximal end adapted to hold a needle and having a first cap locking member, said first cap locking member comprising a first set of annular ridges; a plunger comprising a shaft having a proximal end and a distal end wherein said distal end includes a second plunger locking member which is matable with said first plunger locking member o said cylinder when said plunger is inserted in said cylinder, thereby prohibiting removal of said plunger from said cylinder; and a cap having a wide opening and a length sized to cover a needle which may be carried on said cylinder, said cap including a second cap locking member, comprising a second set of annular ridges which engages said first cap locking member on said proximal end of said cylinder, thereby preventing reuse of said needle carried on said cylinder; wherein one of said two cap locking members further includes a plurality of tabs formed thereon and the other of said cap locking members further includes a plurality of slots formed therein, said tabs and slots being formed at unequal intervals around the circumference of said annular ridges, wherein said slots may be aligned with said tabs to further secure said cap onto said cylinder.