Hypodermic needle assembly
OwnerSakharam D. Mahurkarinventor
Life of this patent
Estimating the term…
Abstract
A hypodermic-needle sample collection device includes an elongated, generally cylindrical barrel forming an aperture at the distal end of the barrel and opening into the interior of the barrel, and a needle bolder mounted for longitudinal movement within the barrel The needle holder includes a pin projecting laterally therefrom. A hollow needle carried by the needle holder projects from the holder along the axis of the barrel. The pin is guided by longitudinal linear and helical guide surfaces extending along at least a portion of the length of the barrel for moving the needle longitudinally within the barrel in response to relative rotational movement between the linear and helical guide surfaces.
Claims17
A hypodermic-needle sample collection device, said device comprising:
- an elongated, generally hollow cylindrical body forming an aperture at the distal end of said cylindrical body and opening into the interior of said cylindrical body;
- a needle holder mounted for longitudinal movement within said cylindrical body, said needle holder having an element projecting laterally therefrom;
- a hollow hypodermic needle carried by said needle holder and projecting from said holder along the axis of said body;
- and
- longitudinal linear guide surfaces formed on said cylindrical body and a guide tube inside said cylindrical body and having helical guide surfaces formed thereon;
- said linear and helical guide surfaces extending longitudinally for at least a portion of the length of said device for engaging said projecting element and moving said needle bidirectionally longitudinally within said cylindrical body in response to bidirectional relative rotational movement between said linear and helical guide surfaces.
A blood sample collection assembly operable in a normal mode and convertible to a retraction mode, comprising:
- a first chamber forming a hollow nozzle located at the distal end of said first chamber and opening into the interior of said first chamber, said first chamber having a longitudinal slot formed in the cylindrical wall of said first chamber;
- a vacuum tube chamber within said first chamber and rotatable relative thereto, said vacuum tube chamber having an open end for receiving a vacuum tube and a helical guide surface;
- a needle holder carrying at least one hollow needle, said hollow needle being mounted on the distal end of said needle holder, and protruding through said nozzle, said needle holder being slidably mounted in said first chamber for movement between a forward position and a retracted position, said needle holder engaging said helical guide surface so that relative rotation between said chambers moves said needle holder between said forward and retracted positions, said first hollow needle being concealed by said first chamber when said needle holder is in said retracted position;
- latch means for coupling said chambers to lock said needle holder in said forward position during the normal mode, said latch means being disengageable from said first chamber during the retraction mode;
- and
- locking means for locking said needle holder in said retracted position.
Dependencies are inferred from the claim text.