Syringe with retractable needle

Details Syringe with retractable needle Syringe with retractable needle

A - Human Necessities

61

M

A61M 5/32 (2006.01) A61M 5/20 (2006.01) A61M 5/24 (2006.01) A61M 5/50 (2006.01)

Patent

CA 2135804

A syringe device for cartridged drugs has automatic needle retraction after cartridge contents expression. Drug cartridge (50, 125) is at least partially accommodated within a hollow piston actuator or carrier (30, 145, 245) and is released for further retraction under bias (22, 121) thereinto by way of a piston rod (40, 132, 233). Piston rod (40, 132, 232) serves to operate piston (52, 130) contained in the drug cartridge and has deflectable locking arms (42, 137, 237) that extend sideways into latching engagement with holding formation (38, 147, 247) of the piston actuator. Release of the arms by engagement with the open rear end of the cartridge (50, 125) permits retraction of needle and cartridge. Automatic needle insertion and cartridge contents discharge is also foreseen.

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