| 摘要 |
An improved method of making a catheter (10) such as an over the needle catheter and made therefrom is disclosed. The method comprises forming a headed portion on a length of flexible tubing (22) by pressing a small, metallic, (or plastic) cylindrical insert into the proximal end of the tubing (22) preformed to accept the insert. A hub (24) is injection molded with an internal recess which forms a first internal surface with a narrower through hole in the forward end of the hub (24). A third interior portion of the hub (24) at the rearward end forms a an internal shoulder where it meets the recess. The tubing (22) is passed through the hub (24) so that the headed portion seats itself in the recess against the first internal surface. A heated die or ultrasonically driven staking tool is inserted through the rear end of the hub (24) to press against the internal shoulder to form a narrowed diameter which terminates against the rear end of the insert in the headed portion to thereby lock the tubing (22) in sealing engagement with the hub (24). A smooth, step free transitional portion is formed between the third portion and the recess where the die or tool has a frustum-shaped surface. |
