Application of laser processing technology in the field of medical device manufacturing Ⅱ

Laser welding: Used for micro-welding of precision and complex parts

Medical devices are usually hand-held tools or small parts that are often used during surgery or implanted into the body. The welds that hold these parts together are essential to the patient's health. Therefore, the weld quality needs to be strictly controlled, which requires repeatable laser pulses, small spot diameters, and effective absorption of laser energy through the material. Generally, the welding process with penetration depth and solder joint size less than 1mm is called laser microwelding. Laser microwelding is commonly used for precision welding of products such as pacemakers, surgical blades, endoscopic instruments, and batteries.

Laser microwelding can be divided into two types: spot welding and seam welding. Medical tube, fine spring electric contact, hook assembly, medical guide wire and medical sea wave wire need spot welding process. The spot welding process requires the precise delivery of laser energy to the solder joint, so a suitable laser spot is required.

Seam welding is a method used to seal implanted devices in the human body and can be achieved using pulsed Nd:YAG lasers or CW lasers. The specific laser used is determined by the geometry of the welding part or the sensitivity of the material to heat.