The medical spring is composed of an inner and an outer part. The outer part is made of high quality stainless steel wire wound on the spring rotating bed. Steel wire requirements bright, tough, elastic, winding must be uniform and tight, arranged neatly and dense consistent. The spring should be able to withstand backbending and not break easily under certain force.

The cavity in the center of the medical spring is the inside of the medical spring. There is a steel wire core, and the front end of the steel wire heart is gradually tapered. The tip of the very slim steel wire core is welded together with the tail of the spring, and then the end of the steel wire core is welded with the end of the spring, and polished smooth, that is to become the simplest medical spring.

Safety medical spring (Safety medical spring), the spring center of the steel wire core retreat in the spring several centimeters, and the spring is not welded, so that the front end of the spring is more soft. There is also a safety wire with a diameter below 0. Imm, parallel with the wire core, the end of which is welded with the spring to ensure that the spring will not break and lose a section in the blood vessel. The medical spring is divided into two kinds: one is a fixed steel wire core, that is, the steel wire core is welded to the end of the spring; The other is a movable wire core, the end of which is welded to the handle. It can be moved forward and backward to change the stiffness and shape of the front end of the medical spring.

Some medical springs are coated with an extremely thin film of polytetrapkryptonite, which is intended to make the spring smoother and reduce the coefficient of friction with the catheter.