Syringe

Patent metadata

Field	Value
Publication number	US-11219718-B2
Application number	US-201816497492-A
Country	US
Kind code	B2
Filing date	Mar 13, 2018
Priority date	Mar 31, 2017
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

Abstract

The present invention improves the feeling in use when a finger is hooked on a finger grip. This syringe is provided with a cylinder 22, a syringe needle 24, a finger grip 30, and a plunger rod 32. The finger grip 30 is provided with a cylindrical portion and a pair of finger hook portions. The finger hook portion has an inclined curved surface 70 and an end-side curved surface 72. The inclined curved surface 70 is disposed on a side, of a side surface of the finger hook portion, connected to the cylinder 22. In the inclined curved surface 70, the inclination of a base-side region with respect to the center axis of the cylindrical portion is gentler than the inclination of an end-side region with respect to the center axis of the cylindrical portion. The end-side curved surface 72 is disposed at the boundary between the end of the finger hook portion and the inclined curved surface 70. The end-side curved surface 72 extends along the boundary.

First claim

The invention claimed is:

1. A syringe comprising:
a cylinder;
a syringe needle connected to one end of the cylinder;
a finger grip connected to the other end of the cylinder; and
a plunger rod passing through the finger grip and entering into the cylinder,
the finger grip including
a cylindrical portion having one end and the other end, the cylinder being inserted from the one end, and the plunger rod extending through from the other end of the cylindrical portion, and
a pair of finger hook portions protruding from an outer circumferential surface of the cylindrical portion to opposite directions,

the pair of finger hook portions each including
an inclined curved surface located on one side surface of each finger hook portion facing the one end of the cylindrical portion and having an area on a proximal side of the one side surface and an area on a distal side of the one side surface, the area on the distal side of the one side surface being closer to the other end of the cylindrical portion than the area on the proximal side of the one side surface, and the area on the proximal side having a shallower slope with respect to a center axis of the cylindrical portion than the area on the distal side, and
an end-side curved surface disposed in a boundary between a tip of finger hook portion and the inclined curved surface and extending along the boundary, wherein the end-side curved surface extends as far as to the tip of each finger hook portion, and

a length obtained by subtracting twice a radius of curvature of the end-side curved surface and an outer diameter of the cylindrical portion from a length between the tip of one finger hook portion and the tip of the other finger hook portion is 19.2 mm or more.

2. The syringe according to claim 1 , wherein the length obtained by subtracting twice the radius of curvature of the end-side curved surface and the outside diameter of the cylindrical portion from the length between the tip of one finger hook portion and the tip of the other finger hook portion is 22.2 mm or less.

3. The syringe according to claim 1 , wherein the length obtained by subtracting twice the radius of curvature of the end-side curved surface and the outside diameter of the cylindrical portion from the length between the tip of one finger hook portion and the tip of the other finger hook portion is 20 mm or less.

4. The syringe according to claim 3 , wherein the inclined curved surface has a radius of curvature of 15.8 mm or more.

5. The syringe according to claim 1 , wherein
the plunger rod includes
a plate part, and
a rod part continuous with the plate part and receiving a force from the plate part,

the plate part being provided with a recess on one surface opposite from a surface continuous with the rod part.

Assignees

• Takeda Pharmaceuticals Co
• Arte Corp

Inventors

• Kanazawa Atsushi
• Kamata Kiyotaka
• Ono Akihiko
• MANOSHIRO Tomoyuki
• Arai Jiichi
• CHODA Naoki

Classifications

• A61M5/31511

  Piston or piston-rod constructions, e.g. connection of piston with piston-rod (A61M5/5066 takes precedence) · CPC title

• A61M5/284

  comprising means for injection of two or more media, e.g. by mixing · CPC title

• A61M5/3137 Primary

  Specially designed finger grip means, e.g. for easy manipulation of the syringe rod · CPC title

• A61M2005/3139

  Finger grips not integrally formed with the syringe barrel, e.g. using adapter with finger grips · CPC title