Hypodermic needle assembly
First Claim
1. A needle-syringe assembly, comprising:
- an elongated, generally cylindrical barrel forming a hollow nozzle located at the distal end of said barrel and opening into the interior of said barrel;
a plunger slidably mounted in said barrel and forming a longitudinal cavity;
a needle holder slidably mounted in said longitudinal cavity of said plunger;
guide means forming a spiral channel extending along a proximal end portion of said barrel for engaging a lateral extension of said needle holder and retracting said needle holder within the barrel in response to relative rotational movement between the barrel and the plunger, andlatching means on said barrel for latching and unlatching said lateral extension of said needle holder at the distal end of said spiral channel.
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Accused Products
Abstract
A needle-syringe assembly comprises an elongated, generally cylindrical barrel which forms a hollow nozzle located at the distal end of the barrel and which opens into the interior of the barrel. A plunger is slidably mounted in the barrel and forms a longitudinal cavity. A needle holder carries a hollow needle on the distal end, and the needle holder is slidably mounted in the longitudinal cavity of the plunger. The needle holder includes a lateral arm which extends between the plunger cavity and the barrel. A spiral channel or slot forms a guide surface which extends along a proximal end portion of the barrel for engaging the lateral arm of the needle holder and retracting the needle holder within the barrel in response to relative rotational movement between the barrel and the needle holder.
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Citations
21 Claims
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1. A needle-syringe assembly, comprising:
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an elongated, generally cylindrical barrel forming a hollow nozzle located at the distal end of said barrel and opening into the interior of said barrel; a plunger slidably mounted in said barrel and forming a longitudinal cavity; a needle holder slidably mounted in said longitudinal cavity of said plunger; guide means forming a spiral channel extending along a proximal end portion of said barrel for engaging a lateral extension of said needle holder and retracting said needle holder within the barrel in response to relative rotational movement between the barrel and the plunger, and latching means on said barrel for latching and unlatching said lateral extension of said needle holder at the distal end of said spiral channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification