The guide wire spring tube is one of the main tools for percutaneous intubation. The guide wire guides and supports the catheter, helping it enter spaces such as blood vessels, and guiding the catheter to reach the lesion site smoothly. In catheterization, it is as important as the catheter.

1、 Structure of guide wire

The guide wire is composed of two parts, the inner and outer, and the outer layer is wrapped with high-quality stainless steel wire on the spring spinning bed. The steel wire requires smoothness, toughness, and elasticity, and must be compacted evenly, orderly, and uniformly during winding. The spring should be able to withstand repeated bending under a certain force without breaking. The cavity in the center of the spring is inside the guide wire, equipped with a hard core, and the front end of the core gradually becomes thinner. Weld the tip of the extremely fine wire core to the end of the spring, then weld the end of the wire core to the end of the spring, and polish it smooth to become the simplest guide wire.

The steel core at the center of the spring is located a few centimeters behind the spring and is not welded to the spring, making the front of the spring softer. There is also a safety wire with a diameter less than 0.1mm, parallel to the wire core, and its end is welded to the spring to ensure that the spring will not break and be lost in the blood vessel. There are two types of guide wires: one is a fixed core, which is welded to the end of the spring; The other is a movable magnetic core with one end welded to the handle. It can be moved back and forth to change the hardness and shape of the front end of the guide wire. Some catheters are coated with an extremely thin layer of polytetrafluoroethylene film to make them smoother and reduce the coefficient of friction with the catheter. The sheath of high-quality guide rails is treated with heparin, which not only has less friction but also has the ability to prevent blood clotting.