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Sequential medical fluid aspiration and injection system and method

  • US 5,743,886 A
  • Filed: 08/20/1996
  • Issued: 04/28/1998
  • Est. Priority Date: 02/15/1994
  • Status: Expired due to Term
First Claim
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1. A syringe for the sequential withdrawal of a first liquid and a second liquid into said syringe and for the subsequent sequential injection of said second liquid and then said first liquid into a patient, the syringe comprising:

  • a. a barrel having a distal end and an opening in said distal end;

    b. a proximal piston moveable along said barrel to define a variable volume chamber intermediate said proximal piston and said distal end;

    c. a chamber divider piston for separating said variable volume into primary and secondary reservoirs, said chamber divider piston being moveable along said barrel within said variable volume chamber, said chamber divider piston being positioned adjacent said distal end prior to withdrawal of said first liquid into said syringe;

    d. a flow channel along said syringe, said flow channel being capable of providing flow connection between the primary reservoir and the secondary reservoir, said flow channel being in fluid communication with said opening and said secondary reservoir;

    e. an element linking said proximal piston and said chamber divider piston so that when said proximal piston is moved away from said chamber divider piston, and said first reservoir is at least partially filled with said first liquid, said chamber divider piston is urged by said element away from said distal end to enlarge said secondary reservoir and to withdraw said second liquid into said secondary reservoir;

    wherein said syringe includes a valve, said valve being capable of at least one disabling and enabling flow between said primary reservoir and said secondary reservoir through said flow channel;

    wherein said flow channel extends through said divider piston;

    wherein said valve comprises a plug carried by said chamber divider piston adjacent said flow channel, said plug being moveable from a first position wherein said flow channel is open to a second position that is a sealing position wherein said flow channel is closed and sealed by said plug.

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