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Pre-filled injector

A technology of prefilled syringes and needle tubes, applied in the field of syringes, can solve problems such as high cost and limited resources, and achieve the effect of reducing sterilization costs, solving resource constraints, and ensuring aseptic quality

Pending Publication Date: 2017-12-08
石家庄鑫富达医药包装有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a prefilled syringe suitable for high temperature sterilization, which solves the problem of limited resources and high cost caused by gamma ray sterilization, which may cause stability problems for some drugs , Sterility assurance issues

Method used

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Examples

Experimental program
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Embodiment Construction

[0027] A prefilled syringe, comprising a cap 1, a needle tube 2, a handle 3, a push rod 4 and a piston 5, the end of the needle tube 2 near the handle 3 has an internal thread, the handle 3 has an inner hole, the front end of the handle 3 has an external thread, the needle tube 2 and the handle 3 are threadedly connected and assembled by rotation. The outer diameter of the push rod 4 matches the inner hole size of the handle 3. The cap 1 has internal threads, and the front end of the needle tube 2 has external threads. The cap 1 and the needle tube 2 are threaded connection, the outer diameter of the rear end of the piston 5 matches the inner diameter of the needle tube 2, and the inner hole size of the handle 3 matches the inner diameter of the needle tube 2. Piston 5 adopts high temperature resistant medical silicone material.

[0028] A preparation method of a prefilled syringe, the push rod 4 is passed through the inner hole of the handle 3, and then the top of the push ro...

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Abstract

The invention belongs to the technical field of injectors and discloses a pre-filled injector. The pre-filled injector comprises a tubing cap, a needle tubing, a handle, a push bar and a piston, the front end of the handle is provided with an inner thread, an outer thread is arranged in the needle tubing and close to the handle end, the handle and the needle tubing are assembled rotatably in a threaded manner, the front end of the needle tubing is provided with an outer thread, the tubing cap is provided with an inner thread, the tubing cap and the needle tubing are assembled rotatably in a threaded manner, the outer diameter of the push bar is matched in size with the inner diameter of the handle, and the outer diameter of the piston is matched in size with the inner diameter of the needle tubing; during assembly, the push bar penetrates the handle to be assembled with the piston, the assembled handle is in threaded connection with the needle tubing, and assembly is locked to form a retaining structure. A filling machine is characterized in that a certain amount of liquid medicine is injected to the injector from the top end of the needle tubing, the tubing cap and the needle tubing are rotatably assembled in a threaded manner and locked hermetically, and then the injector is sent to a sterilization bin for steam sterilization for 30 minutes at a high temperature of 121DEG C.

Description

technical field [0001] The invention belongs to the technical field of syringes, in particular to a prefilled syringe. Background technique [0002] At present, ordinary prefilled syringes cannot be sterilized by high-temperature steam after filling the liquid medicine. Since the sterilization temperature is 121°C and the time is 30 minutes, the syringe and the liquid medicine will expand due to heat during this period, and the cap is easy to separate from the syringe. , resulting in liquid leakage, and most of the pistons of existing prefilled syringes are made of LDPE, with a Vicat softening point temperature of 95°C, which is not resistant to high temperatures. When the sterilization temperature exceeds 95°C, the piston softens due to the expansion of the liquid medicine in the needle tube. , the liquid medicine is very easy to leak from the position of the piston. At the same time, the existing prefilled syringe body structure has a handle on the needle pipe. Thermal ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M5/178A61M5/31A61M5/315
CPCA61M5/178A61M5/31A61M5/3129A61M5/315A61M2205/02A61M2207/00
Inventor 段胜凯王锦君
Owner 石家庄鑫富达医药包装有限公司
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