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Syringe system

  • US 20030009132A1
  • Filed: 09/28/2001
  • Published: 01/09/2003
  • Est. Priority Date: 04/13/2001
  • Status: Active Grant
First Claim
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1. An in-line volumetric reducer useable to advance a predetermined volume of liquid to an open end of a fluid-delivery catheter comprising:

  • a rigid housing defining;

    a proximal opening attachable to a distal end of a hydraulic pressure line, said line having a proximal end in fluid communication with a plunger, whereby said proximal opening is in fluid communication with said pressure line when attached thereto;

    a first inner chamber extending distally from said proximal opening and having a predetermined, substantially uniform, cross-sectional area along a predetermined linear axis;

    a distal opening attachable to a proximal end of a catheter such that said distal opening is in fluid communication with said catheter when attached thereto; and

    , a second inner chamber extending proximally from said distal opening and having a predetermined, substantially uniform cross-sectional area along a predetermined linear axis, wherein said cross-sectional area of said second inner chamber is smaller than said cross-sectional area of said first inner chamber;

    a piston assembly including;

    a first piston operably disposed within said first inner chamber and having a proximal side and a distal side, said first piston forming a substantially liquid-tight seal with said rigid housing such that pressurized liquid on said proximal side of said first piston is not able to pass around said first piston to said distal side of said first piston; and

    , a second piston operably disposed within said second inner chamber and having a proximal side and a distal side, said second piston forming a substantially liquid-tight seal with said rigid housing such that liquid on said distal side of said second piston is not able to pass around said second piston to said proximal side of said second piston;

    wherein said first piston is operably attached to said second piston such that when said first piston is moved linearly a predetermined distance, said second piston moves linearly an equal distance to said predetermined distance.

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