Preparation method for low-resistance injector

A technology of low-resistance syringes and core rods, applied in syringes, infusion sets, etc., can solve the problems of material debris, incomplete cleaning, and contamination of liquid medicine, and achieve the effects of avoiding pollution, improving sliding resistance, and avoiding safety risks

Active Publication Date: 2014-09-03
蔡朝林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 2. Material debris appears in the processing process, and incomplete cleaning leads to the contamination of the liquid medicine

Method used

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  • Preparation method for low-resistance injector
  • Preparation method for low-resistance injector

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Embodiment Construction

[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0032] The low-resistance syringe prepared by the present invention, such as figure 1 , 2 As shown, it includes a core rod 2 and a jacket 1. The core rod 2 is a tubular body, one end of the core rod 2 has a datum plane 21 , and the other end is equipped with a core rod presser 22 . The jacket 1 is a tubular body, which is set outside the core rod 2 . A conical head 11 is installed at one end of the jacket 1 , and a crimp 12 is installed at the other end. The core rod 2 and the jacket 1 are made of polymethyl methacrylate (PMMA) through extrusion tube processing technology. The polymethyl methacrylate used to prepare the core rod 2 and the jacket 1 in the present invention is medical grade polymethyl methacrylate.

[0033] The above-mentioned low-resistance syringe is prepared through the following steps: firstly, the core rod 2 and the jacket 1 are respec...

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Abstract

The invention discloses a preparation method for a low-resistance injector. The preparation method for the low-resistance injector comprises a core bar and a jacket. The core bar and the jacket are formed by polymethyl methacrylate through the extrusion pipe processing technology. The inner circular surface of the jacket is ground and pressed through the vacuum grinding and pressing technology, so that the accuracy error of the circular degree of the inner circle is not larger than 5 micrometers, the outer circular surface of the core bar is ground and pressed through the heat outer circle grinding and pressing technology, so that the accuracy error of the circular degree of the outer circle is not larger than 5 micrometers, and then the outer circular surface of the core bar is coated with a teflon film with the thickness not larger than 5 micrometers through the fast teflon steam film coating method. According to the preparation method for the low-resistance injector, chippings which pollute medicine liquid are avoided, the initial push-and-pull resistance of the low-resistance injector produced through the preparation method does not exceed 0.5 N, the sliding push-and-pull resistance of the low-resistance injector does not exceed 0.3 N, and the clinical application requirements can be met.

Description

technical field [0001] The invention relates to a medical low-resistance syringe. Background technique [0002] Disposable sterile syringes are the most commonly used medical devices. The jacket of disposable sterile syringes is made of plastic injection molding. Affected by the characteristics of the material, the jacket must have a certain taper when the product is demolded. At the same time, it is affected by the temperature. The error of the roundness of the inner surface of the jacket can reach 0.2-0.25mm. In the process of use, the rubber piston can only be installed on the core rod, and the elasticity of the rubber piston can be used to overcome the tightness caused by the injection deformation error. The problem. The push-pull sliding resistance between the rubber piston and the plastic jacket can only be solved by spraying silicone oil on the piston as a lubricant. Technical indicators such as extracted metal content bring a certain amount of negative impact, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M5/178
Inventor 蔡朝林
Owner 蔡朝林
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