Syringe barrel with guide

• US 20040092881A1
• Filed: 10/22/2003
• Published: 05/13/2004
• Est. Priority Date: 02/10/2000
• Status: Active Grant

• Current Assignee: Shigeru Nemoto
• Original Assignee: Shigeru Nemoto
• Inventors: Nemoto, Shigeru
• Granted Patent: US 7,264,612 B2
• Time in Patent Office: Days
• US Class Current: 604/187
• CPC Class Codes: A61M 2205/14 Detection of the presence or absence of a tube, a connector or a container in an apparatus
• CPC Class Codes: A61M 5/007 for contrast media
• CPC Class Codes: A61M 5/14546 Front-loading type injectors
• CPC Class Codes: A61M 5/1456 with a replaceable reservoir comprising a piston rod to be moved into the reservoir, e.g. the piston rod is part of the removable reservoir
• CPC Class Codes: A61M 5/1458 Means for capture of the plunger flange
• CPC Class Codes: A61M 5/3135 characterised by constructional features of the proximal end

Abstract

Since this syringe has projections provided on the rear surface of a flange of a syringe barrel, when it is inserted in an insertion groove of a cylinder holder, the tips of projections are compressed and the flange is fixed. Consequently, even when a solution having high viscosity is injected at higher pressure, breakage does not occur easily. Further, pressure-receiving area may also be increased by providing a guide defining mounting direction of a syringe, alternatively, a positioning mechanism may be provided so as to obtain mounting at a correct position, or the surface of a flange may be roughened.

Claims

1. A syringe barrel for an injection apparatus, the syringe barrel being adapted to be mounted on a cylinder holder that comprises a flange insertion groove, the syringe barrel comprising:

a flange adapted to be held by said flange insertion groove so as to fix the syringe barrel;

a guide which can be engaged with the cylinder holder and restrict the mounting direction of the syringe barrel.

2. The syringe barrel according to claim 1, wherein the guide is a projection having thickness of such size that the projection is not fitted in the flange insertion groove, and rotation of the cylinder is inhibited when the syringe barrel is mounted on a cylinder holder by engagement of the projection with a portion of the cylinder holder.

3. The syringe barrel according to claim 2, wherein the cylinder holder comprises a vertical part on the inner wall surface on the syringe barrel side, and the guide has a straight line part to be engaged with the vertical part.

4. The syringe barrel according to claim 2, wherein the cylinder holder comprises two clamps;

the two clamps being open before mounting the syringe barrel, and upper parts of the clamps being closed toward inner side to fix the flange when the syringe barrel is mounted on the cylinder holder.

5. A pre-filled syringe, comprising:

a syringe comprising a syringe barrel of any of claims 1 to 4; and

a chemical solution filled in the syringe.