Syringe barrel with reinforcing rib

• US 7,344,520 B2
• Filed: 10/23/2003
• Issued: 03/18/2008
• Est. Priority Date: 02/10/2000
• Status: Expired due to Fees

• Current Assignee: Shigeru Nemoto
• Original Assignee: Shigeru Nemoto
• Inventors: Nemoto, Shigeru
• Primary Examiner(s): DESANTO, MATTHEW F
• Application Number:
  US10/691,690
• Publication Number:
  US 20040087909A1
• Time in Patent Office: 1,608 Days
• Field of Search: 604/181, 604/187, 604/131, 604/151, 604192-198, 604/207, 604/218, 604/208, 604/227, 604/188, 604/225, 604/154, 604232-235, 600/432, 222325-327
• 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; and

a reinforcing rib comprising a concentric reinforcement and a plurality of radial reinforcements, said reinforcing rib being provided on a rear surface of the flange, wherein the radial reinforcements are positioned around the concentric reinforcement, and wherein the radial reinforcements taper in height towards an outside of the flange.

2. 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.

3. A syringe barrel according to claim 2, wherein the positioning mechanism is a latch pushed by a coil spring.

4. A syringe barrel according to claim 2, wherein the positioning mechanism is a blade spring having a pawl.

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

6. 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.

7. A syringe barrel according to claim 1, comprising a double flange.

8. A pre-filled syringe, comprising:

a syringe comprising a syringe barrel of one of claims 1 to 4 and 7; and

a chemical solution filled in the syringe.