Barrel for syringe and pre-filled syringe

Patent metadata

Field	Value
Publication number	US-9579463-B2
Application number	US-201615061643-A
Country	US
Kind code	B2
Filing date	Mar 4, 2016
Priority date	Sep 6, 2013
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

A syringe barrel includes an barrel main body having a cylinder tip at a distal end of the barrel main body; and a cap detachably attached to the cylinder tip by threaded engagement to seal an opening of the cylinder tip. The cylinder tip comprises at least one projection that projects radially from an outer periphery of a proximal end part of the cylinder tip. The cap includes a cylindrical cover that covers an outer periphery of the cylinder tip. A proximal-side inner periphery of the cover comprises a reduced radius portion, and, when the cap is threadedly engaged with the cylinder tip, a distance from a rotation axis of the cap to the reduced radius portion is smaller than a distance from the rotation axis to an outer end of the at least one projection.

First claim

The invention claimed is:

1. A syringe barrel comprising:
an barrel main body having a cylinder tip at a distal end of the barrel main body; and
a cap detachably attached to the cylinder tip by threaded engagement to seal an opening of the cylinder tip,
wherein the cylinder tip comprises at least one projection that projects radially from an outer periphery of a proximal end part of the cylinder tip,
wherein the cap includes a cylindrical cover that covers an outer periphery of the cylinder tip,
wherein a proximal-side inner periphery of the cover comprises a reduced radius portion, and, when the cap is threadedly engaged with the cylinder tip, a distance from a rotation axis of the cap to the reduced radius portion is smaller than a distance from the rotation axis to an outer end of the at least one projection,
wherein a portion of the proximal-side inner periphery of the cover is expanded outwardly by the at least one projection, which deforms another portion of the proximal-side inner periphery inwardly, thereby forming the reduced radius portion, and
wherein the reduced radius portion is engaged with the at least one projection to prevent loosening of the cap when the cap is attached to the cylinder tip.

2. The syringe barrel according to claim 1 , wherein, before the cap is engaged with the cylinder tip, the proximal-side inner periphery of the cover has a circular cross-sectional shape in a plane perpendicular to an axis of the cover.

3. The syringe barrel according to claim 2 , wherein the at least one projection comprises two projections that project in opposite directions from an axis of the cylinder tip.

4. The syringe barrel according to claim 1 , wherein:
the cap includes a sealing part that is in contact with a distal end of the cylinder tip and is made of an elastic material, and
when the cap is attached to the cylinder tip, the sealing part is pressed by the distal end of the cylinder tip to seal the opening of the cylinder tip.

5. The syringe barrel according to claim 4 , wherein an engagement force between the reduced radius portion of the cover and the projection is larger than a disengagement force exerted on the cap based on an elastic force of the sealing part.

6. The syringe barrel according to claim 1 , wherein the reduced radius portion of the cover is formed by performing heat treatment in a state in which the cap is attached to the cylinder tip.

7. The syringe barrel according to claim 6 , wherein the heat treatment is autoclave sterilization.

8. The syringe barrel according to claim 1 , wherein the cylinder tip comprises a female luer configured such that a male luer is insertable into and connectable to the female luer.

9. The syringe barrel according to claim 1 , wherein:
the cylinder tip comprises:
a male luer that is insertable into and connectable to a female luer, and
a cylindrical lock adaptor surrounding an outer periphery of the male luer and having a female screw formed on a inner periphery of the cylindrical lock adapter, and

the at least one projection is formed on an outer periphery of the lock adaptor.

10. A pre-filled syringe comprising:
the syringe barrel according to claim 1 ;
a gasket that is slidably movable in the barrel main body in a liquid-tight manner; and
a drug filled in a filling chamber defined by the barrel main body, the gasket, and the cap.

Assignees

• Terumo Corp

Inventors

• Okihara Hitoshi

Classifications

• A61M5/28 Primary

  Syringe ampoules or carpules, i.e. ampoules or carpules provided with a needle · CPC title

• A61M5/31505

  Integral with the syringe barrel, i.e. connected to the barrel so as to make up a single complete piece or unit · CPC title

• A61M2005/3104

  Caps for syringes without needle · CPC title

• A61M2005/3106

  Plugs for syringes without needle · CPC title

• A61M5/3134 Primary

  characterised by constructional features of the distal end, i.e. end closest to the tip of the needle cannula · CPC title