The basic requirements of Джвелл machinery china medical plastics are chemical stability and biological safety because they are in contact with liquid medicine or human body. Medical devices can be subdivided into in vitro diagnostics, medical consumables, medical equipment, and pharmaceutical equipment. Due to the characteristics of low cost, easy processing, light weight and toughness, plastics have been widely used in medical devices.
According to the different use environments of medical devices,Джвелл china has different requirements for polymer materials, but generally speaking, it should have the following properties:
1. Good physical and mechanical properties and can meet the needs of related functions.
2. Good chemical resistance, can meet the service period in the use environment, and will not affect the relevant performance after disinfection.
3. Good molding performance, easy to process into various shapes.
4. Non-toxic, no “three causes” (carcinogenic, teratogenic, genetic mutation) effects, no pyrogen reaction, low content of extractables and extractables.
5. It does not damage adjacent tissues, does not interfere with the body’s immune mechanism, and does not cause calcification on the surface of the material.
6. It has good anticoagulant properties. When the material is in contact with blood, it will not cause hemocytopenia after hemolysis, nor cause protein denaturation in blood, and will not destroy the formed components of blood.
7. The material has sufficient stability when implanted in the body, and the mechanical properties will not change significantly after long-term use (excluding degradable materials).
There are about a dozen medical plastic materials commonly used in china extruder machine, polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyurethane (PU), polytetrafluoroethylene (PTFE), polycarbonate (PC), polystyrene (PS), etc. PVC and PE account for the largest amount, accounting for 28% and 24% respectively; PS accounts for 18%; PP accounts for 16%; engineering plastics account for 14%.
China Jwell extrusion PVC is a low cost amorphous plastic with excellent chemical resistance and antimicrobial resistance. According to market estimates, PVC accounts for 28% of the medical plastics market. The advantages are that the cost of PVC resin is low, the application range is wide, and it is easy to process. The disadvantage is that PVC, as a polar material, has an adsorption effect on some drugs, and the plasticizer DEHP may be precipitated to harm the human body.
PVC products for medical applications include: blood bags, hemodialysis tubing, breathing masks, oxygen inhalation tubes, urine bags, artificial ears and noses, etc.
China Jwell extruder PE is a general-purpose plastic with the largest output. It has the advantages of good processing performance, low cost, non-toxic and tasteless, and good biocompatibility. Ordinary PE can usually be used for medicine bottles, needle caps, syringe push rods, infusion set flow regulators, infusion sets and syringe packaging bags, etc.
Jwell machinery manufacturer UHMWPE (Ultra High Molecular Weight Polyethylene) is a special engineering plastic with high impact resistance, strong wear resistance (the crown of plastics), low friction coefficient, biological inertness and good energy absorption characteristics, its chemical resistance The pharmaceutical properties are comparable to PTFE, and it is an ideal material for artificial hips and artificial joints.
PP has excellent chemical resistance, fatigue resistance, good heat resistance, and can be sterilized at temperatures above 100 °C. Easy to process, no environmental stress cracking issues. Medical PP has higher transparency, better barrier properties and radiation resistance.
It can be used in infusion bags, disposable syringes, connectors, parenteral injection nutrition packaging, dialysis membranes, etc.
PS, K resin
The amount of PS in the medical field is second only to PVC and PE. Its texture is hard and brittle, and it has a high thermal expansion coefficient. Therefore, it limits its application in engineering. In recent decades, modified polystyrene and styrene-based copolymers have been developed to overcome the shortcomings of polystyrene to a certain extent. K resin is one of them.
K resin is a block copolymer formed by polymerization of styrene and butadiene as monomers. Its main characteristics are high transparency and good impact resistance, low density, strong tinting strength, excellent processing performance, and non-toxicity.
K resin is mainly used in medical plastic products with difficult processing technology, high technical content and high added value, such as the changing chamber of artificial lung-oxygenator, the outlet of arterial blood vessel, the outlet of arterial outlet of recovery device, the suction head of the heart, the aorta Intubation, blood filter, suction device, thermostat, etc.
The ABS plastic of Jwell machinery is a terpolymer of three monomers, acrylonitrile (A), butadiene (B) and styrene (S). It has certain rigidity, hardness, impact resistance and chemical resistance, and radiation resistance. And resistant to ethylene oxide sterilization.
The medical application of ABS is mainly used as surgical tools, roller clips, plastic needles, tool boxes, diagnostic devices and hearing aid shells, especially the shells of some large medical equipment.
The characteristics of PC are high toughness, strength and heat-resistant steam sterilization, which make PC the preferred choice for hemodialysis filters, surgical tool handles and oxygen tanks; PC applications in medicine also include needle-free injection systems, perfusion instruments , Blood Centrifuge Bowl And Pistons.
PTFE is a type of fluoroplastic, known as the king of plastics, with the lowest coefficient of friction and the best chemical resistance of any known plastic. Good biocompatibility and anti-coagulation, no decomposition, no adverse reactions when implanted in the human body and no obvious aging, excellent heat resistance, continuous use temperature of 260 ° C, high temperature disinfection can be used. In the medical field, it is widely used in various artificial trachea, esophagus, bile duct, urethra, artificial peritoneum, brain dura, artificial skin, artificial bone, etc.
china extruder machine manufacturer thermoplastic polyurethane elastomer (TPU) has excellent low temperature flexibility and resistance to hydrolysis, anti-coagulation, anti-microbial attack, and can be used in medical catheters, artificial hearts, oxygen masks, drug release equipment, IV connectors, Rubber pouch for sphygmomanometer, wound wrap for topical administration, etc.
Biodegradable plastics are a class of ideal medical materials. Inert medical materials (that is, common medical materials with relatively stable properties) generally have the problems of poor long-term compatibility and the need for secondary surgery, and degradable materials avoid these shortcomings. Commonly used medical degradable materials include polylactic acid (PLA) and polycaprolactone (PCL).
PCL has good biodegradability, drug permeability, and can release drugs stably for a long time. PCL has good compatibility with biological cells, cells can grow normally on its scaffold, and can be degraded into CO2 and H2O. It is used for drug sustained-release carrier, cosmetic material, vascular stent, surgical suture, cell and tissue culture frame, etc.
China Jwell machinery PLA has good mechanical properties and good biocompatibility, and can be used for medical sutures and implants. Moreover, the surface of PLA products can form a weakly acidic environment, which has antibacterial and antifungal effects. If other antibacterial agents are used in addition, the antibacterial rate of more than 90% can be achieved, which can be used for antibacterial packaging of products.