Single-use syringe

Details Single-use syringe Single-use syringe

A - Human Necessities

61

M

A61M 5/50 (2006.01) A61M 5/31 (2006.01)

Patent

CA 2486511

A single-use syringe includes a barrel having front and rear passageways and a shoulder disposed therebetween, a plunger movable in the rear passageway, a carrier having a tail portion extending from a front end wall of the plunger, and pushing and retained regions formed forwardly of the tail portion, and a deformable sealing member in fluid-tight and slidable engagement with the barrel . The sealing member includes an inner surrounding wall surface with a yielding segment engaging the pushing region, and a retaining segment in frictional engagement with the retained region by a frictional force so as to confine a fluid-tight surrounding area. The frictional force is diminished when the yielding segment is depressed by the pushing region so as to facilitate release of the retained region from the retaining segment, thereby disrupting the fluid-tightness of the surrounding area and rendering the syringe unreusable.

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