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Prefilled syringe

A technology for prefilled syringes and plungers, applied in syringes, hypodermic injection devices, infusion sets, etc., can solve problems such as gasket deformation and liquid leakage, and achieve the effects of preventing liquid leakage and inhibiting plunger detachment

Active Publication Date: 2012-12-12
TERUMO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during installation work, the tip of the plunger deforms the gasket, and there is a high possibility of liquid leakage
In addition, after the plunger is installed, when the plunger is pushed, the tip of the plunger deforms the gasket, and liquid leakage may also occur.

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0069] Hereinafter, the prefilled syringe of the present invention will be described using examples shown in the drawings.

[0070] The prefilled syringe 1 of the present invention is composed of a prefilled syringe main body 10 and a plunger 4. The prefilled syringe main body 10 is composed of an outer cylinder 2 and a gasket accommodated in the outer cylinder 2 so as to be slidable in the outer cylinder 2. 3. The sealing member 5 for sealing the front end opening of the outer cylinder 2, and the medicine 8 accommodated in the medicine storage part formed in the outer cylinder 2 are constituted, and the plunger 4 is already attached to the gasket 3 or can be attached to the gasket. 3.

[0071] The gasket 3 is a cylindrical body with a closed front end and an open rear end, and the gasket 3 is composed of a gasket body 6 having a cavity portion 60 extending from the opening at the rear end to the front end side, and a plunger mounted on the gasket body 6 . The mounting member...

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PUM

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Abstract

A gasket (3) for a prefilled syringe (1) comprises a gasket body (6) and a member (7) which is adapted for mounting on the plunger. The gasket body (6) has formed on the inner surface thereof a rib (62) for retaining the member for mounting on the plunger. The member for mounting on the plunger is provided with: an outer surface protrusion section (73) engaging with the rib (62) of the gasket body (6), the rib (62) retaining the member for mounting on the plunger; elastically deformable inside protrusion sections (75) extending obliquely, from an inner section on the rear end side of the member (7) for mounting on the plunger, in the direction toward the center of the member (7); and plunger retaining engagement sections (76) respectively formed at the free ends of the inside protrusion sections. The plunger (4) is provided with: a tubular front end section (42) capable of entering the inside of the member (7) for mounting on the plunger; and an outer surface protrusion section (43) engaging with the plunger retaining engagement sections of the member (7) for mounting on the plunger.

Description

technical field [0001] The present invention relates to prefilled syringes prefilled with medical fluids. Background technique [0002] As the prefilled syringe, there are a type in which the plunger is not pre-attached to a spacer (ga sket), but a type in which the plunger is attached at the time of use, and a type of prefilled syringe in which the plunger is pre-attached to the spacer. [0003] A prefilled syringe of the type in which the plunger is attached to the gasket is manufactured by attaching the plunger to the gasket after inserting the gasket into the outer cylinder using a method called so-called vacuum packing, in which the so-called The method of vacuum packing is carried out as follows: In the state where the drug is filled in the outer cylinder whose tip opening is sealed, a gasket is placed on the opening of the outer cylinder in a reduced-pressure atmosphere (under-vacuum atmosphere), and then, Set to a normal pressure state, thereby inserting the gasket ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M5/315
CPCA61M2005/3118A61M2005/3104A61M5/31515
Inventor 冲原等
Owner TERUMO KK
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