Recently, the new coronavirus pneumonia epidemic has affected the heartstrings of more than one billion people.
All sectors of society are united to cheer for Wuhan and China.
When the epidemic is raging, the majority of chemical companies have stepped forward to fight on the battlefield without gunpowder smoke, working overtime to ensure the production of urgently needed materials such as anti-epidemic disinfectant, protective clothing and mask materials, once again showing the pillar role of the chemical industry.
Medical plastics are also an indispensable and important member of this battle.
It ranges from CT machines, bedside oximeters, ventilators and other equipment to kits, disposable infusion sets, etc.
What are the commonly used medical plastics? What is the future development trend? Today I will talk to you about those things about medical plastics.
Due to the contact with liquid medicine or human body, the basic requirements of medical plastics are chemical stability and biological safety.
To put it simply, the components in the plastic material cannot be precipitated into the liquid medicine or the human body, will not cause toxicity and damage to the tissues and organs, and are non-toxic and harmless to the human body.
Medical plastics in the United States usually pass FDA certification and USPVI biological testing, and medical-grade plastics in my country are usually tested by relevant testing centers.
The user usually chooses the appropriate plastic type and the appropriate brand according to the structure and strength requirements of the device product, and determines the processing technology of the material.
These properties include processing performance, mechanical strength, use cost, assembly method, sterilization and so on.
There are about a dozen commonly used medical plastic materials, polyethylene ( PE ), polypropylene (PP), polyvinyl chloride ( PVC ), polyurethane (PU), polytetrafluoroethylene (PTFE), polycarbonate (PC) , Polystyrene (PS), etc.
, PVC and PE account for the largest amount, 28% and 24% respectively; PS accounted for 18%; PP accounted for 16%; engineering plastics accounted for 14%.
Several commonly used medical plastics are:
According to market estimates, approximately 25% of medical plastic products are PVC.
Mainly because of the low cost of the resin, wide application range, and easy processing.
Medical PVC products include: hemodialysis tubing, breathing mask, oxygen tube, etc.
Usually can be used for needle caps, syringe plungers, infusion set flow regulators, infusion sets and syringe packaging bags, etc.
Among them, UHDPE has high impact strength, low friction, stress crack resistance and good energy absorption characteristics, making it an ideal material for artificial hip, knee and shoulder connectors.
Medical PP has higher transparency, better barrier properties and radiation resistance, making it widely used in medical equipment and packaging industries.
Non-PVC material with PP as the main body is a substitute for the widely used PVC material.
The texture is hard and brittle, and has a high coefficient of thermal expansion, which limits its application in engineering.
In recent decades, the development of modified polystyrene and styrene-based copolymers has overcome the shortcomings of polystyrene to a certain extent.
K resin is one of them.
The medical application of ABS is mainly used as surgical tools, roller clamps, plastic needles, tool boxes, diagnostic devices and hearing aid housings, especially the housings of some large-scale medical equipment.
The typical characteristics of PC are toughness, strength, rigidity and heat-resistant steam sterilization.
These characteristics make PC a priority choice for blood dialysis filters, surgical tool handles and oxygen tanks (when in surgical heart surgery, this instrument can remove blood from the Carbon dioxide, increase oxygen); PC applications in medicine also include needle-free injection systems, perfusion instruments, blood centrifuge bowls and pistons.
The coefficient of friction is the lowest among plastics and has good biocompatibility.
It can be made into artificial blood vessels and other devices directly implanted in the human body.
Large replacement import space
The global medical device market is about US$500 billion; disposable consumables account for 40% of the devices.
In developed countries and regions such as Europe, the sales of disposable medical consumables have accounted for 45% of their total sales of medical devices, while my country only accounts for 20%.
From the perspective of imports, my country imports the largest amount of disposable consumables, accounting for nearly half of the total imports.
From the perspective of material, compared with metal or glass materials used in traditional medical devices, plastics have good chemical inertness and biological safety, and are inexpensive, easy to form, relatively tough, suitable for one-time use, and are hygienic and safe.
At present, there are still not many companies with strong strength in the production of medical plastics in my country.
Although PVC and PP are basically domestically produced, medical plastics such as PE, PC and ABS still rely on imports.
In the future, my country's medical plastics will show the trend of functionalization, precision, integration, chipization, and individualization.
If relevant companies want to enter the industry chain, they need to do four understandings and choose an entry point.
That is, to understand the development status of the industry, legal and regulatory requirements, marketing rules, technology and technical characteristics; according to their own advantages, choose to start with the situation of foundry, plant construction, and investment cooperation.
Innovative small businesses can still do a lot.
(Keywords: PVC PE epidemic)