Syringe assembly with automatic safety shield
OwnerRobert J. Cohninventor
Life of this patent
Estimating the term…
Abstract
A safety shield for use with a hypodermic syringe device is disclosed. The safety shield is moveable relative to the syringe barrel between retracted position and a needle containing position. In the retracted position, the syringe device may be used to inject the needle into the patient. After the medication has been injected or as the needle is withdrawn from the patient, in its operative mode the shield automatically extends from its retracted position to a needle containing position to shield the point of the needle to prevent accidental sticks and without further input from the operator to render the syringe unusable after a single injection.
Claims20
A safety shield assembly for use with a syringe device having a hollow barrel defining a reservoir within which a medicament may be held, a forward projecting hypodermic needle in fluid communication with the reservoir, the syringe device further including a plunger rod assembly comprising a plunger rod slidable within and partially projecting rearward from the open proximal end of said syringe barrel, said plunger rod selectively moveable within the reservoir along a forward injection stroke, whereby medicament is expelled from the reservoir through the needle, said safety shield assembly comprising:
- an outer shield axially moveable relative to said syringe barrel between retracted and needle-containing positions, said outer shield including an engagement member that engages a first catch member on said syringe barrel in the retracted position;
- said outer shield not having an operatively positioned outwardly extending finger gripping flange;
- a driving member positioned between said outer shield and said syringe barrel that urges said outer shield to said needle-containing position;
- said driving member retained in an energized condition when said outer shield is retained in said retracted position;
- and,
- a plunger rod assembly release member wherein continued forward movement of said release member disengages said engagement member from said first catch member, said outer shield moving to said needle-containing position.
A safety shield assembly for use with a syringe device having a hollow barrel defining a reservoir within which a medicament may be held, a forward projecting hypodermic needle in fluid communication with the reservoir, the syringe device further including a plunger rod assembly comprising a plunger rod slidable within and partially projecting rearward from the open proximal end of said syringe barrel, said plunger rod selectively moveable within the reservoir along a forward injection stroke, whereby medicament is expelled from the reservoir through the needle, said safety shield assembly comprising:
- an outer shield axially moveable relative to said syringe barrel between retracted and needle-containing positions, said outer shield including an engagement member that engages a first catch member on said syringe barrel in the retracted position;
- said outer shield not having an operatively positioned outwardly extending finger gripping flange;
- a driving member positioned between said outer shield and said syringe barrel that urges said outer shield to said needle-containing position;
- said driving member retained in an energized condition when said outer shield is retained in said retracted position;
- and,
- a plunger rod assembly comprising a release member and a stopper wherein continued forward movement of said release member disengages said engagement member from said first catch member after said stopper distorts against said hollow barrel, said outer shield moving to said needle-containing position.
A safety shield assembly for use with a syringe device having a hollow barrel defining a reservoir within which a medicament may be held, a forward projecting hypodermic needle in fluid communication with the reservoir, the syringe device further including a plunger rod assembly comprising a plunger rod slidable within and partially projecting rearward from the open proximal end of said syringe barrel, said plunger rod selectively moveable within the reservoir along a forward injection stroke, whereby medicament is expelled from the reservoir through the needle, said safety shield assembly comprising:
- an outer shield axially moveable relative to said syringe barrel between retracted and needle-containing positions, said outer shield including an engagement member that engages a first catch member on said syringe barrel in the retracted position;
- said outer shield not having an operatively positioned outwardly extending finger gripping flange;
- a driving member positioned between said outer shield and said syringe barrel that urges said outer shield to said needle-containing position;
- said driving member retained in an energized condition when said outer shield is retained in said retracted position;
- and,
- a plunger rod assembly comprising a release member and a stopper wherein continued forward movement of said release member disengages said engagement member from said first catch member after said stopper compresses, said outer shield moving to said needle-containing position.
Dependencies are inferred from the claim text.