Cutting element for a retracting needle syringe

摘要

A cutting element for a retracting needle syringe having a plunger with a cuttable distal end and a spring biased needle held by a cuttable support and a cutting element capable of cutting the cuttable distal end and the cuttable support includes a body portion having a proximal end, a distal end side wall therebetween and a passageway therethrough. The distal end of the body portion includes a cutting edge and a raised distally projecting tapered cutting tooth having distally converging edges. At least one tooth edge includes a sharp side wall for cutting the distal end of the plunger and the needle support.

主权项

1. A syringe plunger comprising:
a) a proximal portion having an elongate cavity therein, a distal end, and a cutting element positioned at the distal end, wherein the cutting element comprises a body portion having a proximal end, a distal end, a side wall therebetween defining a longitudinal axis and a passageway therethrough, the distal end including a cutting edge and a plurality of raised distally projecting tapered cutting teeth each having a distal tip and distally converging edges, at least one tooth edge having a sharp side wall for cutting a stopper on a distal end of a hollow distal portion of the plunger, wherein the cutting teeth are separated by curved concave cutting edges running along the distal end of the body portion; b) a hollow distal portion of the plunger having the proximal portion inserted therein, wherein the distal portion is releasably connected to the proximal portion and capable of telescopic motion with respect to the proximal portion upon release of the releasable connection; and c) the stopper on the distal end of the hollow distal portion which seals the distal end of the distal portion, wherein the stopper is made of an elastomeric or thermoplastic material.