| 摘要 |
<p>A method of forming a spiral layer on the inside of a catheter comprises: preparing a hollow tube-shaped base material to be used as a catheter body; preparing a core shaft, the outer surface of said core shaft being provided with a spiral layer, the material of the outer surface being offset from the material of the hollow tube-shaped base material, and the size of said spiral layer being designed such that the outer diameter of the spiral of said spiral layer is less than or equal to the inner diameter of the hollow tube-shaped base material; inserting the core shaft into the inside of the hollow tube-shaped based material; by means of heating, sleeving the hollow tube-shaped base material onto the spiral layer of the core shaft such that the depth to which said spiral layer is embedded into said base material is less than or equal to the height of said spiral layer; and extracting the core shaft from the hollow tube-shaped base material, thereby forming a spiral layer on the inside of the hollow tube-shaped base material. Because the core shaft having the spiral layer can be reused, the cost of said invention is low. Moreover, the formation of the spiral layer on the inside of the catheter does not involve other substances and thus does not introduce additional biological or structural risks.</p> |
