NEEDLE EXTENSION AND RETRACTION MECHANISM FOR A SYRINGE FOR DRAWING BLOOD SAMPLES AND PROVIDED WITH A VACUUM TUBE

摘要

A needle-extension and retraction device for a syringe for collecting blood samples provided with a vacuum tube includes a needle having a front and rear part. The syringe includes a front portion of a reduced diameter, and a rear portion of a greater diameter, in which the said vacuum tube is housed. The extension and retraction mechanism includes a resilient front member, which further includes a resilient rear member. The resilient front member has a resilient return constant that is slightly less than that of the said rear resilient member. A fastening member having a front end and a rear end is disposed between the resilient front member and the resilient rear member. A sealing member that includes a front face and a rear face, is disposed about the rear resilient return element. The device also includes an actuator means disposed on the rear portion of the syringe.

主权项

1. A needle-extension and retraction device for a syringe (J) for collecting blood samples provided with a vacuum tube (T), comprising:
a needle (A) having a front (2a) and rear part (2a); and said syringe (J) comprising a front portion (1a) of a reduced diameter and a rear portion (1b) of a greater diameter, in which said vacuum tube (T) is housed; said extension and retraction mechanism comprising a resilient front member (4) and a resilient rear member (10), wherein said resilient front element (4) has a resilient return constant that is slightly less than that of said rear resilient member (10);
a fastening member (5) provided with a front end (5a) and a rear end (5b), disposed between said resilient front member (4) and said resilient rear member (10);a sealing member (9) that includes a front face and a rear face, disposed about said rear resilient return element (10); andan actuator means (16) disposed on said rear portion (1b) of said syringe (J).