With the rapid development of the medical industry, laser welding technology also has a huge market application space on the road of helping medical devices. Compared with other common welding technologies, laser welding technology produces almost no welding slag and debris, and there is no need to add any adhesive in the welding process, so the whole welding work can be completed in the clean room. At present, in addition to the application of laser welding technology in the production of medical equipment, there are many other laser processing technologies in the manufacturing of medical equipment, such as laser surface modification, laser cutting, laser drilling and laser micromachining.
1. Cardiac stent
Cardiac stent, also known as coronary stent, is a common medical device in cardiac interventional surgery. It has the function of dredging arteries. The main materials are stainless steel, nickel titanium alloy or cobalt chromium alloy. It first appeared in the 1980s and experienced the development process of metal stent, coated stent and soluble stent. In the process of the heart stent reaching the destination through transmission, its trace and open state can be clearly seen from the opaque rays at both ends of the stent. The opaque markers can be made of precious metals such as gold, tantalum and platinum iridium. The markers can be riveted. This forming process can adopt the minimum spot diameter of 40 μ M (0.04mm) laser will weld the disc-shaped marker into the special eye hole. The research and application of laser welding technology make it possible to effectively connect two very small parts, which is also the reason why laser welding is more and more widely used in the field of medical devices.
2. Gastroscopic biopsy forceps
The gastroscope biopsy forceps used in medical treatment need to go deep into the patient's body, so the quality requirements of the biopsy forceps are very strict. Each component of the biopsy forceps needs to meet a certain tensile strength and good appearance, especially when there are no burrs on the surface. In the previous production and processing process, the front-end pliers of gastroscope biopsy forceps are combined by riveting and resistance welding, which will leave burr and other defects on the surface of the puncture gun. Resistance welding will also cause great deformation of parts and affect the practical application of the puncture gun. However, laser welding technology has the advantages of non-contact processing, narrow thermal influence range, high efficiency With the characteristics of high machining precision, it can meet the welding requirements of no defect, no groove, no crease, no burr and no crack in the medical field.
3. Balloon catheter
Balloon catheter is a kind of medical intervention equipment. Its main function is to dilate the upper gastrointestinal stenosis. Laser welding of balloon catheter is infrared welding using laser as energy source. Laser beam can be directly shot to the plastic surface absorbing laser to melt the plastic and realize welding. The advanced laser welding technology can realize the seamless connection between the balloon head end and the tube body, so that the balloon catheter can advance smoothly in the curved and narrow diseased blood vessels, minimize the damage to the blood vessels, and make the operation process safer. The introduction of laser welding technology is conducive to further reduce the tip outer diameter of balloon dilation catheter.
4. Earwax protector
Hearing aids are becoming more and more miniaturized, so as to provide users with smaller, more comfortable and invisible hearing aids. Today's typical ite hearing aid is only the size of a little finger tip. But all hearing aids face a big problem: ear wax (also known as earwax) produced in the ear canal pollutes the sound output area. In order to ensure that the hearing aid can play its reliable function, it is necessary to provide protective measures at the sound output position. In the earwax protection of Phonak's new "intelligent guard", an extremely thin diaphragm with high elasticity is welded on the micro gasket, which can effectively block the earwax from entering the hearing aid. This kind of welding technology is the laser mask welding process developed by Swiss ledan technology company, which makes this high-precision connection process possible. The size of the whole earwax protector is only a few millimeters. A diaphragm needs to be welded to a washer about 3mm in size, which is made of thermoplastic material.