Elastic cap and syringe assembly therewith
AssigneeTerumo Kabushiki Kaisha
InventorMasafumi TAKEMOTO
Life of this patent
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Abstract
An elastic cap detachably mountable to a barrel tip portion of a barrel so as to seal a tip of a needle hole includes a cylindrical receiving hole configured to receive at least part of a barrel tip portion and a puncture needle of a barrel. The receiving hole includes a first inner diameter portion having a smaller diameter than an outer diameter of the annular head; a stopper portion provided at an end of the first inner diameter portion; and a second inner diameter portion that is formed from the stopper portion to a bottom wall provided at an end of the second inner diameter portion, the second inner diameter portion having a smaller diameter than the first inner diameter portion.
Claims14
An elastic cap detachably mountable to a barrel tip portion of a barrel so as to seal a tip of a needle hole, the barrel including:
- a cylindrical barrel body having an opening at a base end;
- a barrel tip portion having an annular head and being provided at an end of the barrel body;
- and a puncture needle having a needle hole and being held in the barrel tip portion so that a tip of the puncture needle projects from the barrel tip portion, the elastic cap comprising:
- a cylindrical receiving hole configured to receive at least part of the barrel tip portion and the puncture needle,
- wherein the receiving hole includes:
- a first inner diameter portion having a smaller diameter than an outer diameter of the annular head;
- a stopper portion provided at an end of the first inner diameter portion;
- and
- a second inner diameter portion that is formed from the stopper portion to a bottom wall provided at an end of the second inner diameter portion, the second inner diameter portion having a smaller diameter than the first inner diameter portion,
- wherein a minimum diameter of the receiving hole is 2 to 10 times the outer diameter of the puncture needle, and
- wherein the elastic cap is configured such that upon attachment to the barrel tip portion, at least part of the barrel tip portion is inserted into the receiving hole, the first inner diameter portion is in close contact with an outer peripheral surface of the annular such that an airtight seal is formed between the first inner diameter portion and the barrel tip portion, the stopper portion abuts against an end face of the annular head such that the stopper portion defines a final insertion position of the barrel tip portion, and the tip of the puncture needle is inserted into the bottom wall such that the bottom wall seals the tip of the needle hole.
A syringe assembly comprising:
- a barrel assembly including:
- a cylindrical barrel body having an opening at a base end,
- a barrel tip portion having an annular head and being provided at an end of the barrel body, and
- a puncture needle having a needle hole and being held in the barrel tip portion so that a tip of the puncture needle projects from the barrel tip portion;
- and
- an elastic cap including:
- a cylindrical receiving hole configured to receive at least part of the barrel tip portion and the puncture needle,
- wherein the receiving hole includes:
- a first inner diameter portion having a smaller diameter than an outer diameter of the annular head;
- a stopper portion provided at an end of the first inner diameter portion;
- and
- a second inner diameter portion that is formed from the stopper portion to a bottom wall provided at an end of the second inner diameter portion, the second inner diameter portion having a smaller diameter than the first inner diameter portion,
- wherein a minimum diameter of the receiving hole is 2 to 10 times the outer diameter of the puncture needle, and
- wherein the elastic cap is configured such that upon attachment to the barrel tip portion, at least part of the barrel tip portion is inserted into the receiving hole, the first inner diameter portion is in close contact with an outer peripheral surface of the annular head such that an airtight seal is formed between the first inner diameter portion and the barrel tip portion, the stopper portion abuts against an end face of the annular head such that the stopper portion defines a final insertion position of the barrel tip portion, and the tip of the puncture needle is inserted into the bottom wall such that the bottom wall seals the tip of the needle hole.
Dependencies are inferred from the claim text.