Medical injection system and method, gas spring thereof and launching device using gas spring

Device for injecting a medical product comprising:

• a nozzle assembly having a chamber for holding the medical product, an orifice in said nozzle assembly in fluid communication with said chamber for allowing passage of the medical product through said orifice, and a pressure wall member disposed and movable within said chamber holding the medical product;
• and
• an energy mechanism operatively associated with said pressure wall member for moving said pressure wall member at a speed sufficient to eject the medical product from said chamber under a pressure which is sufficient to pierce at least one layer of skin, said enery mechanism comprising a gas spring having a gas spring pressure chamber defined by a tubular sleeve and a pair of end plugs sealingly enclosing said tubular sleeve, and a piston extending through said end plugs and occupying a portion of said gas spring chamber, said gas spring chamber beeing pressurized with gas, and said piston being sealed relative to said end plugs but slidable relative thereto.

Device for injecting a medical product comprising:

• a nozzle assembly having a chamber for holding the medical product, an orifice in said nozzle assembly in fluid communication with said chamber for allowing passage of the medical product through said orifice, and a pressure wall member disposed and movable within said chamber holding the medical product;
• and
• energy means operatively associated with said pressure wall member for moving said pressure wall member at a speed sufficient to eject the medical product from said chamber under a pressure which is sufficient to pierce at least one layer of skin said energy means comprising a gas stepped spring.