Safety module-activator reshielding tool

Apparatus for administering an injection, comprising:

• a cartridge including:
• a medication module containing a supply of fluid medication, a needle cannula extending from a distal end of said medication module and communicating with the fluid supply therewithin, and a piston located at the proximal end of said module, and
• a hollow needle module surrounding and shielding the cannula of said medication module and axially aligned with and connected to said medication module, said needle module being dimensioned relative to said medication module to permit said medication module to slide reciprocally therethrough;
• and
• an activator tool including:
• a barrel having distal and proximal ends and receiving said cartridge therewithin, and
• a piston stem to be connected to the piston of said medication module and moved distally through said barrel to cause said medication module to slide distally through said needle module and thereby advance the needle cannula outwardly of said barrel through an opening in the distal end thereof and to drive said piston distally through said medication module for injecting the fluid thereof via said cannula, said piston stem moved proximally through said barrel after the injection has been completed to slide said medication module proximally through said needle module for retracting said cannula inwardly of said barrel to be reshielded within said needle module.

Apparatus for administering an injection of fluid including a fluid filled cartridge having a needle cannula projecting from one end thereof and a piston located at the opposite end, said apparatus also including:

• a hollow barrel having open proximal and distal ends and adapted to receive said cartridge therewithin such that the needle cannula of said cartridge extends outwardly from said open distal end for administering the injection;
• a piston stem attached to the piston of said cartridge through the open proximal end of said barrel and movable reciprocally thorough said barrel, said piston stem being moved distally through said barrel to correspondingly move said piston through said cartridge to expulse fluid therefrom via the cannula, and said piston stem being moved proximally through said barrel at the conclusion of the injection to cause the cannula to be retracted inwardly of said barrel for receipt within said cartridge;
• and
• direction control means engaging said piston stem to control the distal and proximal movements of said piston stem through said barrel, such that a proximal movement of said piston stem through said barrel is blocked while said stem is moved distally through said barrel to expulse the fluid contents of said cartridge, and a distal movement of said piston stem through said barrel is blocked while said stem is moved proximally through said barrel to retract the cannula within said cartridge.