Automatically positioned needle sheath for a disposable hypodermic syringe
OwnerWilliam B. Baylessinventor
Life of this patent
Estimating the term…
Abstract
A hypodermic syringe has a barrel, a piston with plunger located in the barrel cavity, an elongated body on the barrel forward end and a needle releasably secured to the body end. A sheath slidingly received onto the elongated body has arms with openings on their end portions which can be locked onto pins on the band exterior. The sheath also has shields which normally extend outwardly. A spring-loaded actuator sleeve is slidingly received on the sheath. When the plunger has emptied the barrel cavity, further movement releases the sheath arms from the pins and the spring-loaded actuator moves over the shields closing about the needle.
Claims11
A hypodermic syringe including apparatus for enclosing the needle of the hypodermic syringe to prevent inadvertent injury therefrom, comprising:
- a syringe barrel housing having a cavity, a first opening at one end and an opposite end having second opening smaller than said first opening, said housing including pin means on an external surface thereof;
- an elongated body secured to the barrel housing, said body including an internal passageway extending completely through the body which is in communication with the barrel housing second opening and an end of the body adapted for receiving the hypodermic needle thereon;
- a hollow generally tubular sheath means slidingly received on the elongated body including,
- arm means extending inwardly from the sheath means generally parallel to the barrel housing and having a transverse opening therein for receiving the barrel housing pin means therein, and a plurality of movable shields resiliently and hingedly connected to the sheath means said shields in the relaxed unstressed state extending angularly laterally outwardly from the tubular sheath means;
- piston means having a plunger received within the barrel housing first opening for sliding movement along the cavity including a guide means for engaging the arm means;
- a sleeve actuator slidingly received onto the sheath means and movable from a first position forcing the movable shields laterally toward one another to enclose the needle and to a second position releasing the movable shields to the relaxed state extending laterally outwardly from the tubular sheath of means leaving the needle exposed;
- and
- spring means engaging the sleeve actuator and resiliently urging said actuator away from the barrel housing to the actuator first position enclosing the needle with the shield means when the pin means is removed from the arm means transverse opening by the guide means.
Dependencies are inferred from the claim text.