Syringe

Patent metadata

Field	Value
Publication number	US-11318258-B2
Application number	US-201816500004-A
Country	US
Kind code	B2
Filing date	Mar 13, 2018
Priority date	Apr 5, 2017
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

The present invention suppresses the amount of fluid pushed out from an injection needle when confirming whether air has been pushed out of the injection needle. Provided is a syringe that comprises: a cylinder 20 ; an injection needle 22 ; a needle base 24 ; an injection needle cover 26 ; and a plunger rod 28 . The needle base 24 communicates between the inside of the cylinder 20 and the inside of the injection needle 22 . The injection needle cover 26 , when extended from a folded state, surrounds the injection needle 22 . The injection needle cover 26 comprises an injection needle surrounding part. The injection needle surrounding part has at least one cutout 130 in a section facing the needle base 24 and covering the needle base, such that the needle base 24 can be identified from the outside.

First claim

The invention claimed is:

1. A syringe comprising:
a cylinder in which fluid is stored;
an injection needle that discharges the fluid;
a needle base that connects the injection needle to the cylinder;
and
an injection needle cover that is attached to the cylinder and, when extended from a folded state, surrounds the injection needle,
wherein the cylinder includes
an outer cylinder that forms a storage space in which the fluid is stored, and

a cylinder tip which is provided to protrude from one end of the outer cylinder, to which the needle base is connected, and which forms a communication passage that is part of or cooperates with the needle base such that the communication passage and needle base jointly allow fluid communication between the injection needle and the cylinder,
the injection needle cover includes
a base part that is fixed to surround the cylinder tip,
a base hinge that is a hinge provided to the base part,
an injection needle surrounding part through which the needle base is inserted and which faces the base part in the folded state of the injection needle cover and which surrounds the injection needle when the injection needle cover is extended, wherein the wall of the injection needle surrounding part surrounds an opening to an intra-cylinder space,
a fitting space forming part that is connected to the base part by the base hinge in such a manner as to turn about a base axis and forms a space in which the injection needle surrounding part is to become fitted, the base axis being an axis orthogonal to a central axis of the injection needle,
a connecting hinge that connects the injection needle surrounding part to the fitting space forming part such that the injection needle surrounding part is movable about a connecting axis which is an axis parallel to the base axis, and
a facing connecting part that connects the base part and the injection needle surrounding part with the injection needle surrounding part facing the base part,

the needle base is transparent or translucent, and
the wall of the injection needle surrounding part has at least one cutout such that the needle base can be identified from outside when the base part and the injection needle surrounding part are connected by the facing connecting part in the folded state of the injection needle cover.

2. The syringe according to claim 1 ,
wherein the at least one cutout has paired cutout inner wall parts that form each single cutout and face each other, and
an arcuate bottom part that is disposed between the paired cutout inner wall parts and continuous from the paired cutout inner wall parts.

3. The syringe according to claim 2 , wherein a minimum value of a distance between the paired cutout inner wall parts in a direction orthogonal to the central axis of the injection needle is greater than or equal to a maximum value of an opening width of the arcuate bottom part in the direction orthogonal to the central axis of the injection needle.

4. The syringe according to claim 1 ,
wherein the at least one cutout has
paired cutout inner wall parts that form each single cutout and face each other, and
a linear bottom part that is disposed between the paired cutout inner wall parts and inclined when seen from an edge of one of the cutout inner wall parts, and
the linear bottom part has a flat face that extends along a direction orthogonal to the central axis of the injection needle when the base part and the injection needle surrounding part are connected by the facing connecting part with the injection needle surrounding part facing the base part.

Assignees

• Takeda Pharmaceuticals Co
• Yoshino Kogyosho Co Ltd
• Arte Corp

Inventors

• Okajima Kiyoshi
• Imanishi Yuki
• Arai Jiichi
• CHUMA Yusuke

Classifications

• A61M5/3293

  characterised by features of the needle hub · CPC title

• A61M5/34

  Constructions for connecting the needle {, e.g. to syringe nozzle or needle hub (connecting catheter tubes to hubs A61M25/0014)} · CPC title

• A61M5/3202 Primary

  Devices for protection of the needle before use, e.g. caps (A61M5/50 takes precedence; for infusion spikes A61M5/1626; protectors for sharps A61B50/3001) · CPC title

• A61M5/3275 Primary

  being connected to the needle hub or syringe by radially deflectable members, e.g. longitudinal slats, cords or bands · CPC title