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US 9,808,584 B2Granted
Elastic cap and syringe assembly therewith
AssigneeTerumo Kabushiki Kaisha
InventorMasafumi Takemoto
Life of this patent
Estimating the term…
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.
Claims16
A syringe assembly comprising:
- a barrel assembly comprising:
- a cylindrical barrel body having an opening at a base end;
- a barrel tip portion having an annular head and being disposed at an end of the barrel body;
- and
- a puncture needle having a needle hole and being held in the barrel tip portion such that a tip of the puncture needle projects from the barrel tip portion;
- and
- an elastic cap that is detachably mountable to the barrel tip portion of the barrel assembly, the elastic cap comprising:
- a closed bottom wall at a distal end of the elastic cap,
- an open end portion at a proximal end of the elastic cap,
- a side wall extending from the bottom wall toward the open end portion, and
- a cylindrical receiving hole formed by the bottom wall, the side wall, and the open end portion, the receiving hole being configured to receive at least part of the barrel tip portion and the puncture needle,
- wherein the bottom wall has a base end surface that faces the receiving hole, and
- wherein the receiving hole includes:
- a first inner diameter portion having an inner diameter that is smaller than an outer diameter of the annular head;
- a stopper portion disposed at a distal end of the first inner diameter portion;
- and
- a second inner diameter portion that extends from the stopper portion to said base end surface, an inner diameter of the second inner diameter portion being smaller than the inner diameter of the first inner diameter portion,
- wherein a minimum of the inner diameter of the second inner dinner portion is twice or greater than an outer diameter of the puncture needle,
- 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 a distal 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 penetrates the bottom wall through the base end surface of the bottom wall such that the bottom wall seals the tip of the puncture needle.
16 more elements
A syringe assembly comprising:
- a barrel assembly comprising:
- a cylindrical barrel body having an opening at a base end;
- a barrel tip portion having an annular head and being disposed at an end of the barrel body;
- and
- a puncture needle having a needle hole and being held in the barrel tip portion such that a tip of the puncture needle projects from the barrel tip portion;
- and
- a cap mounted on the barrel tip portion of the barrel assembly, the cap comprising:
- a closed bottom wall at a distal end of the cap,
- an open end portion at a proximal end of the cap,
- a side wall extending from the bottom wall toward the open end portion, and
- a cylindrical receiving hole formed by the bottom wall, the side wall, and the open end portion, the receiving hole being configured to receive at least part of the barrel tip portion and the puncture needle,
- wherein the bottom wall has a base end surface that faces the receiving hole, and
- wherein the receiving hole includes:
- a first portion having an inner diameter that is smaller than an outer diameter of the annular head;
- a stopper portion disposed at a distal end of the first portion;
- a second portion that extends from the stopper portion to said base end surface, an inner diameter of the second portion being smaller than the inner diameter of the first portion;
- a third portion disposed at a proximal end of the receiving hole;
- and
- a temporary stopper portion disposed between the third portion and the first portion and configured to deform elastically,
- wherein a minimum of the inner diameter of the second portion is twice or greater than an outer diameter of the puncture needle,
- wherein the 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 portion is in contact with an outer peripheral surface of the annular head, the stopper portion abuts a distal 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 penetrates the bottom wall through the base end surface of the bottom wall such that the bottom wall seals the tip of the puncture needle,
- wherein a length from the base end surface of the bottom wall to a temporary stopper portion is longer than a length from the tip of the puncture needle to a distal end of the annular head, and
- wherein, when the barrel tip portion inserts from the open end of the cap into the receiving hole to attach the cap to the barrel tip portion, the temporary stopper portion is configured to abut against the annular head such that insertion of the barrel tip portion into the receiving hole is temporarily stopped and an axis of the receiving hole is substantially aligned with an axis of the puncture needle.
- wherein, when the annular head of the barrel tip portion is inserted further into the receiving hole beyond the temporary stopper portion, the temporary stopper portion deforms elastically to allow the annular head of the barrel tip portion to enter the first portion of the receiving hole.
21 more elements
A method of assembling a syringe assembly, the method comprising:
- providing a barrel assembly comprising:
- a cylindrical barrel body having an opening at a base end;
- a barrel tip portion having an annular head and being disposed at an end of the barrel body;
- and
- a puncture needle having a needle hole and being held in the barrel tip portion such that a tip of the puncture needle projects from the barrel tip portion;
- and
- providing a cap comprising:
- a closed bottom wall at a distal end of the cap,
- an open end portion at a proximal end of the cap,
- a side wall extending from the bottom wall toward the open end portion, and
- a cylindrical receiving hole formed by the bottom wall, the side wall, and the open end portion, the receiving hole being configured to receive at least part of the barrel tip portion and the puncture needle,
- wherein the bottom wall has a base end surface that faces the receiving hole, and
- wherein the receiving hole includes:
- a first portion having an inner diameter that is smaller than an outer diameter of the annular head;
- a stopper portion disposed at a distal end of the first portion;
- a second portion that extends from the stopper portion to said base end surface, an inner diameter of the second portion being smaller than the inner diameter of the first portion;
- a third portion disposed at a proximal end of the receiving hole;
- and
- a temporary stopper portion disposed between the third portion and the first portion and configured to deform elastically,
- wherein a minimum of the inner diameter of the second portion is twice or greater than an outer diameter of the puncture needle,
- wherein a length from the base end surface of the bottom wall to a temporary stopper portion is longer than a length from the tip of the puncture needle to a distal end of the annular head,
- inserting the puncture needle and the barrel tip portion of the barrel assembly from the open end portion into the receiving hole until the temporary stopper portion abuts against the annular head of the barrel tip portion and the tip of the puncture needle is disposed in the second portion of the receiving hole,
- aligning an axis of the receiving hole with an axis of the puncture needle by the abutting the temporary stopper portion and the annular head of the barrel tip portion,
- further inserting the barrel tip portion of the barrel assembly into the receiving hole until the stopper portion abuts against a distal end face of the annular head,
- wherein, when the further insertion of the barrel tip portion into the receiving hole, the temporary stopper portion deforms elastically to allow the annular head of the barrel tip portion to enter the first portion of the receiving hole,
- wherein, when the stopper portion abuts against an end face of the annular head, the first portion is in contact with an outer peripheral surface of the annular head, and the tip of the puncture needle penetrates the bottom wall through the base end surface of the bottom wall such that the bottom wall seals the tip of the puncture needle.
23 more elements
Dependencies are inferred from the claim text.