| 摘要 |
<p>The present invention relates to a Method for making catheter (1) tip (15), comprising the steps of:
- providing a main tube (2) defining an axis and having a wall;
- providing a distal flap (10) of said main tube (2);
- providing a ferrule hole (20), said ferrule hole (20) having a mouth (200) the diameter of which, in a first length (202) immediately adjacent to the mouth (200) of said ferrule hole (20), is greater than the outer diameter of the distal flap (10) of the main tube (2), and in a second deeper length (204) a second predefined diameter that avoid the insertion of the distal flap (10), the transition from the first length (202) diameter to the second length (204) diameter of the ferrule hole (20) takes place by a countersink;
- forcing the main tube (2) inside the ferrule hole (20), so that the tube wall is subjected to an axial compression stress that increases until it creates a local phenomenon of wall instability that gives rise to reliefs (11) arranged on planes transversal to said axis, said reliefs (11) having a radial extension limited externally by the ferrule countersink and increasing in the proximal direction ;
- overmoulding coaxially to said distal flap (10) a tapered portion (12), providing in said tapered portion (12) a plurality of notches (13) complementary to said relieves (11).</p> |
