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 carrying a hollow needle on the distal end thereof, said needle holder being slidably mounted in said longitudinal cavity of said plunger, said needle holder including a lateral arm extending laterally through said plunger cavity to said barrel; and
guide means forming a spiral guide surface extending along a proximal end portion of said 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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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 guide means forms a spiral 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
46 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 carrying a hollow needle on the distal end thereof, said needle holder being slidably mounted in said longitudinal cavity of said plunger, said needle holder including a lateral arm extending laterally through said plunger cavity to said barrel; and guide means forming a spiral guide surface extending along a proximal end portion of said 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. 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 carrying a hollow needle on the distal end thereof, said needle holder being slidably mounted in said longitudinal cavity of said plunger, said needle holder including a lateral arm extending laterally through said plunger cavity to said barrel; guide means forming a spiral guide surface extending along a proximal end portion of said 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; means for preventing rotation of said needle holder relative to said plunger so that the needle holder and plunger must rotate in unison; and the lengths of the barrel and the needle holder are selected such that the needle attached to the distal end of the needle holder is fully retracted within the barrel when the lateral arm of the needle holder is retracted to the proximal end of the spiral guide surface.
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25. 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 resilient cap mounted on the distal end of said plunger and forming a sliding seal on the inside surface of the barrel; a needle holder carrying a hollow needle on the distal end thereof, said needle holder being slidably mounted in said longitudinal cavity of said plunger and extending through the resilient cap on the distal end of the plunger, said cap forming a sliding seal on the outside surface of the needle holder; said needle holder including a lateral arm that simultaneously engages said barrel and said plunger; said needle holder also extending into the nozzle of said barrel, the mating surfaces of the needle holder and the barrel nozzle forming a locking taper; and guide means along a proximal end portion of said barrel for engaging the lateral arm of said needle holder and retracting the needle holder within said barrel in response to relative rotational movement between the barrel and the needle holder. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
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33. 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 carrying a hollow hypodermic needle on the distal end thereof, said needle holder being slidably mounted in said longitudinal cavity of said plunger, said needle holder including a lateral arm extending laterally through said longitudinal cavity of said plunger to said barrel; said longitudinal cavity forming a channel that engages opposite sides of said lateral arm of the needle holder to prevent the needle holder from rotating relative to the plunger; guide means forming a spiral guide surface extending along a proximal end portion of said 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, said guide means comprising a sleeve with a spiral slot disposed inside the proximal end portion of the barrel and fixed to the barrel; first locking means for securing the needle holder to the barrel when the needle holder is in its advanced position; second locking means for securing the needle holder to the barrel when the needle holder is in its retracted position; and third locking means for securing the plunger to the needle holder when the needle holder is in its retracted position. - View Dependent Claims (34, 35, 36, 37, 38)
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39. A needle-syringe assembly comprising
a barrel, a plunger within the barrel for sliding longitudinal movement and rotational movement relative to the barrel, and a needle holder within the plunger for sliding longitudinal movement relative to the plunger, said needle holder being moveable beyond the distal end of said plunger for advancing a needle through and beyond the distal end of said barrel, sealing means at the distal end of the needle holder for sealing the interface between the barrel and the needle holder against fluid flow when the needle holder is in its most distal position, means for retracting said needle holder within said barrel, and latch means for selectively locking said needle holder to said barrel at advanced and retracted positions of the needle holder.
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42. 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 carrying a hollow needle on the distal end thereof, said needle holder being slidably mounted in said longitudinal cavity of said plunger, said needle holder including a lateral arm extending laterally through said plunger cavity and engaging said barrel; guide means extending along a proximal end portion of said barrel for engaging the lateral arm of the needle holder and guiding longitudinal movement of the needle holder within the barrel; and latching means for latching the needle holder to the barrel at advanced and retracted positions of the needle holder relative to the barrel. - View Dependent Claims (43, 44, 45, 46)
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Specification