Syringe
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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Abstract
A syringe includes an outer cylinder, a gasket having at least one part which slidably contacts the inner wall of the cylinder and being made of an elastomer material including a block copolymer having styrene units at both terminal ends, and means for sliding the gasket inside the cylinder. The slidably contacting part is compressed inside the cylinder at a compressiblity C (%) of a predetermined range selected according to a particular inner diameter of the cylinder. The product of the total contact area S (mm2) at the compressibility C (%) of the contacting part with the inner wall of the cylinder with the compressibility C (%) is about 350 to about 900.
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Citations
21 Claims
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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 (%). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21)
- 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
- 20. A gasket for a syringe, made of a colorable 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 atoms or combinations thereof, and m, m'"'"' and n represent the mol % of each unit, the sum of m and m'"'"' being 2-20 mol %.
Specification