Blood collecting syringe with retractable needle
OwnerEdward Allardinventor
Life of this patent
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Abstract
A blood-taking syringe having a retractable needle, releasable upon demand, having a needle assembly, under tension from a compressed spring, with a needle holding head supporting a double ended needle axially aligned with the central axis of the syringe, which is held in equilibrium by a releasable wedge interposed between slots in the needle assembly and the inside of the syringe housing. A release pin extends through the side of the syringe at the point where the wedge is located and is disposed such that upon depressing the pin the wedge is dislodged from the slot in syringe housing, releasing the needle assembly to be forced into the syringe for safe storage.
Claims15
A blood taking syringe comprising:
- A syringe housing having a first chamber adapted to accept a removable blood-collecting vacuum vial and a second chamber adapted to hold a releasably mounted needle assembly under tension;
- A needle assembly, including a cylindrically shaped needle retainer, having first and second ends, with a double-ended hypodermic needle extending through the center thereof with said needle and needle retainer being axially aligned with the central axis of the syringe housing;
- A compressable spring, normally held in a compressed mode, seated in the second chamber of the syringe housing for applying pressure to the first end of the needle retainer along the central axis of the syringe housing;
- A needle assembly holding means for applying a restraining force to the first end of the needle retainer for maintaining said needle assembly in a state of equilibrium;
- Manually responsive pressure means for disengaging the needle assembly holding means to allow said needle assembly to be force into the first chamber of the syringe housing.
Dependencies are inferred from the claim text.