×

Syringe

  • US RE32,974 E
  • Filed: 10/15/1987
  • Issued: 07/04/1989
  • Est. Priority Date: 01/23/1983
  • Status: Expired due to Fees
First Claim
Patent Images

2. of said second piston means..]. 9. .[.The syringe of claim 8 wherein.]. .Iadd.A syringe for storing medication and dispensing dosed quantities thereof comprising:

  • a housing;

    a storage chamber within said housing and defining an outlet opening therein;

    a dose chamber in said housing in direct communication with said storage chamber;

    first piston means partially within said housing for initially introducing a fluid into said storage chamber through said outlet opening and subsequently for introducing by pressure a predetermined volume of the fluid into said dose chamber; and

    second piston means partially within said first piston means for expelling the volume of fluid from the dose chamber;

    said first piston means being in direct communication with the storage chamber and operable to vary the volume thereof for a selective increase in the volume to permit the inflow of fluid therein, and for a selective reduction in the volume for generating an increase of pressure therein;

    said second piston means being in direct communication with said dose chamber and operable to vary the volume thereof and mounted for outward movement in response to an increase in the volume of fluid in said dose chamber and for manual inward movement;

    means associated with said second piston means for indicating the volume of fluid in said dose chamber;

    said first and second piston means being coaxial, said first piston means having an inner end and an outer end, said second piston means extending axially through said first piston means with the inner end of the second piston means in said dose chamber and the outer end of the second piston means at the outer end of said first piston means;

    means for preventing relative movement between said first piston means and said housing when said second piston means is moved to expel fluid from the dose chamber;

    sealing means mounted adjacent the outlet opening of said storage chamber and selectively openable to allow fluid movement therethrough;

    said means for preventing relative movement comprising engaged screw thread means on and between said first piston means and said housing arranged such that rotational movement of said first piston means relative to said housing will effect a longitudinal movement of said first piston means relative to said housing and the storage chamber therein;

    said means for indicating the volume of fluid in said dose chamber comprising a tubular handle received over said second piston means and having calibrations thereon;

    means on said handle to adjustably limit outward movement of said second piston means; and

    .Iaddend.said dose chamber .[.is .]. .Iadd.being .Iaddend.defined by an alongate sleeve opening through the inner end of said first piston means, said second piston means being received in said sleeve, said means to adjustably limit inward movement of said second piston means comprising a nut means adjustably mounted on said sleeve, said handle being longitudinally slidable over said nut means, and abutment means on said handle engageable with the nut means, as adjusted, to limit outward

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×