Disposable safety syringe having means for retracting its needle cannula into its medication cartridge

A syringe comprising:

• a hollow cylinder having proximal and distal ends;
• a cartridge located within said cylinder and containing a supply of fluid;
• a needle cannula extending through said distal cylinder end, such that a first end of said cannula is adapted to penetrate said cartridge to communicate with the fluid contents thereof and a second end of said cannula extends outwardly from said cylinder for injecting the fluid of said cartridge;
• and
• means for retracting said cannula into said cartridge at the interior of said cylinder after fluid has been expulsed from said cartridge.

A syringe comprising:

• a cylinder having proximal and distal ends and a bore formed through said distal end;
• a needle cannula extending through said distal bore and being bonded thereto to prevent the movement of said cannula relative to said bore, a first end of said cannula communicating with the interior of said cylinder and the second end of said cannula extending outwardly from said cylinder;
• a fluid filled cartridge located within said cylinder so as to be spaced axially from the first end of said cannula, said cartridge having a piston which is movable therethrough for expulsing the fluid of said cartridge;
• means for moving said cartridge distally through said cylinder such that the first end of said cannula penetrates said cartridge;
• means for breaking the bond between said needle cannula and said distal bore so that said cannula is movable relative to said bore;
• and
• means for engaging the first end of said cannula and retracting said cannula through said bore and into the interior of said cartridge after the fluid has been expulsed therefrom.

A syringe comprising:

• a hollow cylinder having proximal and distal ends and a bore formed through said distal end;
• a needle cannula being received in and retained by said distal bore, such that a first end of said cannula is in fluid communication with the interior of said cylinder and the second end of said cannula extends outwardly from said cylinder to be located at a targeted tissue area of a patient;
• and
• means by which to open said distal bore so as to release said needle cannula and permit the removal of said cannula therefrom.

A syringe comprising:

• a hollow cylinder having proximal and distal ends and adapted to receive a supply of fluid therewithin;
• a hypodermic needle cannula being retained by and extending outwardly from the distal end of said cylinder so as to be positioned to communicate with the fluid supply to be received within said cylinder, whereby said fluid supply can be injected into a targeted tissue via said cannula;
• and
• means for displacing the distal end of said cylinder relative to said cannula to cause said distal end to release its retention of said cannula and thereby permit said cannula to be removed from the distal end of said cylinder.