The probes and leads used for medical devices must be made of different alloys, depending on the end use of the device. The solder joints must be smooth without pores, so that the equipment can be repeatedly disinfected in the autoclave. In some cases, medical equipment is small and requires micro welding. OEM components must be connected to hardened stainless steel for tissue biopsy or dental tools. In other cases, there are electronic components compressed in the tool, must be sealed in the equipment, requiring smooth welding can not damage the components.
Laser welding is suitable for all these devices because laser welding can achieve a smooth seal. Laser welding heat is small, the welding position can be very close to the polymer seal, glass metal seals, welding components, and electronic circuit location. Can also be used for welding leads and connecting lines.
Most of the non-implantable medical tools are 304L stainless steel. It is easy to weld, does not produce cracks, and unlike the high-carbon stainless steel alloy produced in the welding area prone to corrosion. Sometimes with other alloys, such as high hardness stainless steel like 440C or 430, sometimes with titanium alloy Ti6-4, as long as the use of the correct welding method and alloy combination, all of which are weldable.
Surgical tools, such as biopsy tools, use laser welding to connect the pin to the component and solder the assembly to the lead. Dental appliances use a wide range of laser welding, from grinding to tooling shell production. In the assembly of small blood vessel clamp is laser welding, this fine tool on the need for smooth and consistent weld. Brackets, cardiac catheter assemblies, and other arterial treatment tools are assembled using laser welding. In order to facilitate the X-ray inspection, add a new X-ray opaque mark on the component. Rigid endoscopes are often made of stainless steel tubes, sealed with a laser between the tubes, and sealed at the junction with a laser. In most cases, laser welds are smooth, void-free, repeatable, and can be used to require less deformation and high pressure sterilization.
Pulse YAG lasers are the best choice for medical equipment welding. They have high peak power, low heat, can solve the problem of different alloys, can maintain high penetration conditions under the fine processing. Optical fiber transmission is the most commonly used, because consistent focal spot size and energy distribution all contribute to the use of corner and docking fill a variety of gaps, in a large number of welding to get a good nugget diameter. And the range of small focal spots remains within 40-60um. For the need for rapid mass welding, continuous lasers and super mode YAG lasers are the best choice.