Gasket and syringe having the same
AssigneeCoki Engineering Inc.
InventorAkira Yotsutsuji
Life of this patent
Estimating the term…
Abstract
A gasket suitable for a syringe stopping with vacuum is provided. The gasket is compatible with sliding property within the sleeve and water-tightness of the syringe barrel after exiting the sleeve. The gasket includes a gasket body made of a liquid-resistant hard plastic having a tip surface contacting medicinal solution and a concave groove formed on a side surface facing an inner peripheral surface of a syringe barrel and formed continuously to the tip surface contacting medicinal solution; and a sliding contact ring made of an elastic material fitted in the concave groove. Then, an outer diameter D1 of a peripheral end of a tip portion including the tip surface contacting medicinal solution of the gasket body is set to be larger than the outer diameter D4 of the sliding contact ring.
Claims4
A gasket, comprising:
- a gasket body made of a medicinal solution-resistant hard plastic and having a tip surface configured for contacting medicinal solution and a concave groove formed on a side surface configured for facing an inner peripheral surface of a syringe barrel and formed continuously to the tip surface configured for contacting medicinal solution;
- and
- a sliding contact ring made of an elastic material fitted in the concave groove,
- wherein an outer diameter of a peripheral end of a leading portion of the gasket body including the tip surface configured for contacting medicinal solution is larger than an outer diameter of the sliding contact ring,
- in a state of being fitted into the syringe barrel, a peripheral edge portion of the tip surface configured for contacting medicinal solution of the gasket body contacts against an inner peripheral surface of the syringe barrel, and
- the peripheral edge portion of the tip surface configured for contacting medicinal solution contacts the inner peripheral surface of the syringe barrel on a surface of the peripheral edge portion elongated by being bent in a state that the gasket body is fitted in the syringe barrel.
Dependencies are inferred from the claim text.