Syringe barrel with reinforcing rib

• US 7,794,435 B2
• Filed: 01/30/2008
• Issued: 09/14/2010
• 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:
  US12/022,906
• Publication Number:
  US 20080132845A1
• Time in Patent Office: 958 Days
• Field of Search: 604/181, 604/187, 604/227, 604/218, 604/131, 604/151, 604/110, 604/232, 604/191, 604/154
• 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 having a front surface and a rear surface, the syringe barrel comprising:

a double flange, wherein the double flange comprises a front flange and a rear flange, wherein a reinforcing rib is provided between the front and rear flanges and wherein said rib extends from a distal face of the front flange to a proximal face of the rear flange, wherein the front face of the front flange is flat, and wherein the two flanges together are adapted to be inserted inside the flange insertion groove, wherein the flat surface of the front flange contacts the front surface of the flange insertion groove when a chemical solution in the syringe barrel is injected.

2. A pre-filled syringe, comprising:

the syringe comprising a syringe barrel of claim 1; and

a chemical solution filled in the syringe.