Cylinder holder for a syringe barrel with rear surface projection

• US 20040082919A1
• Filed: 10/22/2003
• Published: 04/29/2004
• Est. Priority Date: 02/10/2000
• Status: Active Grant

• Current Assignee: Shigeru Nemoto
• Original Assignee: Shigeru Nemoto
• Inventors: Nemoto, Shigeru
• Granted Patent: US 7,393,341 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 having a projection on a rear surface thereof, said flange being adapted to be held by said flange insertion groove so as to fix the syringe barrel;

the projection being formed such that when the flange is inserted in the flange insertion groove on the cylinder holder and mounted in a use position, a tip of the projection is compressed whereby the flange is fitted into the flange insertion groove and fixed.

2. A syringe barrel according to claim 1, wherein the projection and the flange together are capable of being inserted in the flange holding groove and the tip of the projection is capable of being compressed so as to press the flange against a front sidewall surface of the flange insertion groove in a use position.

3. A syringe barrel according to claim 1, wherein the projection has a narrower width toward the tip, whereby the projection is more deformed when compressed.

4. A syringe barrel according to claim 1, wherein the flange has two flange cut portions symmetrically positioned in the flange opposite to each other.

5. A syringe barrel according to claim 4, wherein the flange has an even number of projections symmetrically disposed to one another on the flange over a portion of the flange where the two flange cut portion are not provided.

6. A syringe barrel according to claim 1, wherein the projection has a pyramid-like shape in which the bottom surface of the projection is rectangular shaped, the longer edge of the rectangle being along the circumferential direction of the flange, and inclination is formed toward the tip.

7. A syringe barrel according to claim 1, wherein the projection has a conical shape.

8. An injection system comprising:

a syringe barrel according to claim 1;

and

a cylinder holder, said cylinder holder comprising;

a flange insertion groove for holding the syringe barrel; and

a concave portion formed on an inner wall surface of the flange insertion groove to be contacted with the rear surface of the flange of the syringe barrel;

whereby, the concave portion is engaged with the projection on the rear surface of the flange when the syringe barrel is mounted in a use position.

11. A pre-filled syringe, comprising:

a syringe comprising a syringe barrel of any of claims 1 to 7 or 10; and

a chemical solution filled in the syringe.

9. A cylinder holder comprising:

a flange insertion groove for holding a syringe barrel; and

a projection on an inner wall surface of the flange insertion groove to be contacted with a rear surface of a flange of the syringe barrel;

the projection being so formed that when the flange is inserted in the flange insertion groove and mounted in a use position, the projection compresses the flange, thereby, the flange is fitted and fixed in the flange insertion groove.

10. An injection system comprising:

a cylinder holder according to claim 9;

and

a syringe barrel, said syringe comprising;

a flange to be held by the flange insertion groove;

a concave portion formed on the rear surface of the flange,

whereby the concave portion is engaged with the projection on an inner wall surface of the flange insertion groove when the syringe barrel is mounted in a use position.