Automatic hypodermic syringe
First Claim
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1. An automatic hypodermic syringe assembly comprising, in combination:
- (a) a syringe, comprising a barrel, a reciprocating plunger within the barrel, and a needle attached to the bottom of the barrel; and
(b) an insertion mounting therefor, the mounting comprising;
(1) a hollow cylinder, open at the top, dimensioned to receive the syringe barrel in longitudinal sliding relationship, and having a base at the bottom with a hole therein dimensioned to pass the needle,(2) trip means engaging the cylinder and the syringe, operable to releasably support the syringe barrel within the cylinder,(3) resilient drive means interconnecting the syringe barrel and the cylinder, and operable to advance the barrel in the cylinder upon release of the trip means, thereby extending the needle, and(4) interchangeable penetration limiting means, operable to predetermine the maximum extension of the needle.
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Abstract
A hypodermic syringe and automatic needle insertion device wherein the syringe is biased against a trigger when the needle is in its retracted position. Upon release of the trigger the syringe and needle are driven forward, extending the needle into the underlying tissue. The depth of insertion may be predetermined by the attachment of an interchangeable stop or foot extension.
372 Citations
7 Claims
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1. An automatic hypodermic syringe assembly comprising, in combination:
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(a) a syringe, comprising a barrel, a reciprocating plunger within the barrel, and a needle attached to the bottom of the barrel; and (b) an insertion mounting therefor, the mounting comprising; (1) a hollow cylinder, open at the top, dimensioned to receive the syringe barrel in longitudinal sliding relationship, and having a base at the bottom with a hole therein dimensioned to pass the needle, (2) trip means engaging the cylinder and the syringe, operable to releasably support the syringe barrel within the cylinder, (3) resilient drive means interconnecting the syringe barrel and the cylinder, and operable to advance the barrel in the cylinder upon release of the trip means, thereby extending the needle, and (4) interchangeable penetration limiting means, operable to predetermine the maximum extension of the needle. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification