Single-use syringe

Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...

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Details

604218, A61M 500

Patent

active

055272860

ABSTRACT:
A single-use syringe has piston (18) mounted in barrel (10) and detachably connected to piston rod (30) though its internal projection (26) engaged by outer projection (36) of elastic leg (34) of the piston rod. Sliding member (48) is mounted in the piston and has cam portion (50). The inside diameter (d) of the sliding member is smaller than the diameter (D) of inside radial face (44) of the internal projection of the piston. The axial length (1) of cam portion (50) of the sliding member is smaller than the axial length (L) of the outer projection of elastic leg (34). When piston rod (30) is moved forward relative to the piston, outer projection (36) of the elastic leg engages the inside face of the sliding member (48) so as to be put into a first position of disengagement from internal projection (26) of the piston and can pass by the internal projection of the piston when the piston rod is moved back relative to the piston so as to put outer projection (36) of the elastic leg into a second disengagement position.

REFERENCES:
patent: 4775363 (1988-10-01), Sandsdalen
patent: 5352203 (1994-10-01), Vallelunga et al.
patent: 5407436 (1995-04-01), Toft et al.

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