Single-use syringe

Details Single-use syringe Single-use syringe

A - Human Necessities

61

M

128/88

A61M 5/178 (2006.01) A61M 5/32 (2006.01)

Patent

CA 2004086

ABSTRACT OF THE DISCLOSURE A single-use syringe is disclosed which comprises a tubular body having a plunger slidable inside it in sealed relationship, a needle movable between a first, safe position and a second, working position, respectively retracted into and extended from the body, through an opening of the latter, and a spring biasing the needle toward its retracted position. To temporarily lock the needle in the working position, the syringe further comprises an expansible retaining member attached to one end of the needle, at least one step defined in the tubular body at such a distance away as to let the step be overridden by the retaining member as the needle is moved from the first to the second position, an expander device for the retaining member carried removably on the plunger and adapted to be received and held in a first socket of the retaining member to expand it following the step overriding and hold the needle in the working position, and a means of dislodging the expander device from the first socket to disengage the retaining member from the step and release the needle for return to its first position.

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