Syringe barrel with reinforcing rib

• US 20040087909A1
• Filed: 10/23/2003
• Published: 05/06/2004
• Est. Priority Date: 02/10/2000
• Status: Active Grant

• Current Assignee: Shigeru Nemoto
• Original Assignee: Shigeru Nemoto
• Inventors: Nemoto, Shigeru
• Granted Patent: US 7,344,520 B2
• Time in Patent Office: Days
• US Class Current: 604/232
• 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 reinforcing rib on a rear surface of the flange.

2. A syringe barrel according to claim 1, wherein the rib and the flange together are adapted to be inserted in a flange holding groove.

3. A syringe barrel according to claim 1, wherein the rib has a height of about 0.2 to about 3 times the thickness of the flange.

4. A syringe barrel according to claim 1, wherein the rib has a concave portion which is adapted to fit a positioning mechanism installed in the cylinder holder.

5. A syringe barrel according to claim 4, wherein the positioning mechanism is a latch pushed by a coil spring.

6. A syringe barrel according to claim 4, wherein the positioning mechanism is a blade spring having a pawl.

11. A pre-filled syringe, comprising:

a syringe comprising a syringe barrel of any of claims 1 to 10; and

a chemical solution filled in the syringe.

7. A syringe barrel, comprising a flange and a reinforcing rib containing a concentric reinforcing part and a radial reinforcing part, provided on the rear surface of the flange.

8. A syringe barrel, comprising a double flange.

9. A syringe barrel, comprising a flange and a thick part provided at a base part on a front surface of the flange.

10. A syringe barrel, comprising a flange and a reinforcing part in the form of a taper provided on a front surface of the flange.