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Syringe

  • US 4,303,070 A
  • Filed: 09/22/1980
  • Issued: 12/01/1981
  • Est. Priority Date: 10/09/1979
  • Status: Expired due to Term
First Claim
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1. A syringe comprising an outer cylinder;

  • a gasket having at least one part which slidably contacts the inner wall of said outer cylinder under the compressed condition forming a water-tight seal and being made of a colorable thermoplastic elastomer material including a block copolymer having a mean molecular weight between about 50,000 and about 200,000 and having the general formula
    
    
    space="preserve" listing-type="equation">(St).sub.m (A).sub.n (St).sub.m '"'"'(where St represents styrene units, A represents a unit derived from an unsaturated hydrocarbon having 2-5 carbon stoms or combinations thereof, and m, m'"'"' and n represent the mol % of each unit, the sum of m and m'"'"' being 2-20 mol %); and

    means for sliding said gasket inside said outer cylinder, said slidably contacting part being compressed inside said outer cylinder at a compressibility C (%) of a predetermined range selected according to a particular inner diameter of said outer cylinder, the product (S×

    C) of the total contact area S (mm2) of said slidably contacting part with the inner wall of said outer cylinder with said compressibility C (%) being about 350 to about 900, the value of S (mm2) being measured at said compressibility C (%).

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