Self-retracting syringe needle

Details Self-retracting syringe needle Self-retracting syringe needle

A - Human Necessities

61

M

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

Patent

CA 2293457

The invention concerns a self-retracting syringe needle comprising a body (1) supporting an injection needle, a plunger (4), a sheath (5) enclosing the body (1), a spring (6) arranged between the sheath (5) and the body (1), flexible pins (7) co-operating as limit stop with the body (1) to define a first position blocking the body (1) relative to the sheath (5) in a first direction. The syringe comprises a circlip (9) mounted around the body (1) in a position compressed between the sheath (5) and the body (1) in the first blocking position and in a released position in the second blocking position, the circlip (9) having at least one part (9a) with external contour of greater dimension than the sheath (5) internal dimension to block the body (1) in the sheath (5) when it is in the second blocking position, in the direction opposite to the first.

Une seringue à aiguille auto-escamotable comprend un corps (1) supportant une aiguille d'injection, un piston (4), un fourreau (5) entourant le corps (1), un ressort (6) disposé entre le fourreau (5) et le corps (1), des ergots souples (7) coopérant en butée avec le corps (1) pour définir une première position de blocage du corps (1) par rapport au fourreau (5) dans un premier sens. La seringue comprend un circlips (9) monté autour du corps (1) dans une position comprimée entre le fourreau (5) et le corps (1) dans la première position de blocage et dans une position relâchée dans une seconde position de blocage, le circlips (9) ayant au moins une partie (9a) de contour extérieur de dimension supérieure à la dimension intérieure du fourreau (5) pour bloquer le corps (1) dans le fourreau (5) lorsqu'il est dans la seconde position de blocage, dans un sens inverse du premier sens.

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