Safety syringe
OwnerFeng-Hui Luinventor
Life of this patent
Estimating the term…
Abstract
A safety syringe includes a barrel, a push rod, a driving module, and a needle mount. The barrel includes a hollow passage and a barrel cover, and the push rod includes a pad disposed around a distal portion and pushed tightly along the hollow passage of the barrel, and the barrel cover includes a plunger, a driving module of a piston pump, and a needle mount having a cut surface at the piston pump, such that the distal portion of the push rod pushes the plunger to move forward, while the cut surface of the distal portion and the cut surface of the needle mount are pressed to separate with each other, and the plunger continues moving forward to offset the air pressure therein, so as to retract the needle mount into a push rod accommodating cavity to accommodate the needle safely after an injection is taken place.
Claims6
A safety syringe, comprising:
- a barrel, having a hollow passage disposed therein, and a barrel cover disposed at a protruding end of a distal portion having a chamber;
- a push rod, installed at said hollow passage of said barrel and having an accommodating cavity including a pressing surface disposed therein, a circular groove disposed at the periphery of said distal portion, and a cut surface with a concave edge disposed separately on both distal surfaces;
- a driving module, installed in said barrel cover of said barrel and including a plunger and a piston pump, and said plunger having a penetrating hole, and its external edge and an internal edge of said penetrating hole being coupled separately with said barrel cover and said piston pump by a washer;
- a needle mount, installed in said piston pump of said driving module, and having a first rod portion, a second rod portion, a third rod portion, and a fourth rod portion extended from an end of said needle mount, and an external edge of said first rod portion being coupled with a flange of said piston pump, and the periphery of said second rod portion having a circular groove, such that said washer is pressed at a hollow penetrating hole of said piston pump, and the periphery of said third rod portion having a circular groove, such that said washer is pressed onto a pressing surface of said protruding end of said barrel cover, and said fourth rod portion is disposed in a perforation of said protruding end of said barrel cover.
Dependencies are inferred from the claim text.