Hypodermic syringe with needle guard
First Claim
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1. A hypodermic syringe with needle guard comprising:
- an elongated tubular barrel having first and second ends, said barrel containing a fluid reservoir and means for pumping fluid to and from said reservoir;
a conduit within said barrel and spaced therefrom for axially connecting said reservoir with a hypodermic needle axially secured to said conduit and extending from the first end of said barrel, the space between said conduit and the interior surface of said barrel forming a cylindrical cavity having its opening adjacent said first end of said barrel;
a tubular needle guard having first and second ends, said guard surrounding the exterior surface of said hypodermic needle and extending past the tip thereof, the size of said needle guard permitting the sliding of said guard within said cylindrical cavity; and
control means including a longitudinal guide groove in the exterior surface of said needle guard, said control means including a control pin extending through a radial hole in said barrel and engaging said guide groove for preventing removal or said guard from said cavity.
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Abstract
A hypodermic syringe with cylindrical guard that surrounds the needle and its tip at all times will protect medical personnel from possible injury from contaminated needles. The needle guard retracts into a cylindrical cavity when pressed against a patient and extends by a spring when the needle is withdrawn.
97 Citations
8 Claims
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1. A hypodermic syringe with needle guard comprising:
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an elongated tubular barrel having first and second ends, said barrel containing a fluid reservoir and means for pumping fluid to and from said reservoir; a conduit within said barrel and spaced therefrom for axially connecting said reservoir with a hypodermic needle axially secured to said conduit and extending from the first end of said barrel, the space between said conduit and the interior surface of said barrel forming a cylindrical cavity having its opening adjacent said first end of said barrel; a tubular needle guard having first and second ends, said guard surrounding the exterior surface of said hypodermic needle and extending past the tip thereof, the size of said needle guard permitting the sliding of said guard within said cylindrical cavity; and control means including a longitudinal guide groove in the exterior surface of said needle guard, said control means including a control pin extending through a radial hole in said barrel and engaging said guide groove for preventing removal or said guard from said cavity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification