With the advancement and development of modern science and technology, silica gel has been widely used in medicine. Silica gel has good biocompatibility, non-irritating, non-toxic, non-allergic to human tissues, and minimal body rejection; Good physical and chemical properties, it can maintain its original elasticity and softness during contact with body fluids and tissues, and will not be degraded. It is a fairly stable inert substance.
Silicon element, the basic component of silica gel material, is the most common and easily available element on the earth. Liquid silicone rubber is easy to make into complex shapes and is chemically inert. Its practicability and excellent characteristics make it very suitable for use in medical equipment from the beginning.
In terms of medical use, silica gel must be tested for biocompatibility and comply with the regulations of the U.S. Food and Drug Administration. Medical silica gel is divided into two categories in terms of application: time-limited and time-free. Usually restricted for short-term transplantation, and unrestricted for long-term transplantation.
Silicone rubber is one of the synthetic rubbers. Its chemical name is polymethylvinylsiloxane. It is made by polymerization of dimethylsiloxane monomer and other organosilicon monomers under the action of acid or alkaline catalysts. The relative molecular weight Generally between 400,000 to 500,000.
- 1. Solid medical silicone rubber can replace bone or cartilage as a tissue filling or scaffold material, so it can be made into artificial joints and artificial tendons to repair the defects of limb joints and tendons. Plastic materials are mostly used as materials to repair deformities and defects on the face, ears, nose, etc.
- 2. Foam medical silicone rubber can replace human adipose tissue and repair the defects and deformities of human facial subcutaneous tissues, such as hemifacial atrophy.
- 3. Membrane medical silicone rubber can be used as a substitute for tendon sheath; the external fistula plug is also made of this type of silica gel, its function is to seal the intestinal fistula in the intestinal cavity, prevent intestinal fluid from leaking, and keep the intestinal tract unobstructed. Restore enteral nutrition, reduce complications, and simplify the treatment of intestinal fistulas.
- 4. Liquid medical silicone rubber, also known as silicone oil, is a low-viscosity transparent liquid. The thick injection needle is used to inject silicone oil into the craniofacial depression and deformity. It is easy to use and can be shaped without hospitalization. It can be treated in outpatient clinics. In addition, medical silicone rubber is used clinically to make hydrocephalus drainage devices to treat hydrocephalus. A spherical artificial heart valve is made to replace the damaged mitral valve of the heart. As for the silicone contraceptive ring, it has the advantages of safety, convenience, reliability and long-term effect. Silicone intravenous catheters, stomach tubes, urinary catheters, etc., have light damage and less irritation, and can be inserted into relevant parts of the human body for a long time. It has been widely used in clinical practice. application