A - Human Necessities – 61 – M
Patent
A - Human Necessities
61
M
A61M 25/00 (2006.01) B29C 47/02 (2006.01) B29C 47/06 (2006.01) B29C 47/28 (2006.01) B29D 23/00 (2006.01)
Patent
CA 2188013
Differential stiffness tubing for medical products, such as catheters, and a method and apparatus for making the tubing. The tubing has a stiff section and a flexible section joined by a relatively short transition section which the materials of the stiff and flexible sections are wedged into each other in a smooth gradual manner to produce an inseparable bond between the materials without abrupt joints. The tubing is made using a resin modulating system and a unique co-extrusion head that minimize the length of the transition section by minimizing the volumes in all flow channels of the head.
Cette invention se rapporte à des tubes à rigidité différentielle pour produits médicaux, tels que des cathéters, ainsi qu'à un procédé et un appareil de fabrication de ces tubes. Ces tubes possèdent une section rigide et une section souple jointes par une section de transition relativement courte, au niveau de laquelle les matériaux des sections rigide et souple pénètrent l'un dans l'autre à la façon de coins formant une jonction graduelle lisse, afin de produire une liaison inséparable entre lesdits matériaux sans raccords abrupts. On fabrique ces tubes en utilisant un système de modulation de résine et une tête de co-extrusion unique, qui réduit au minimum la longueur de la section de transition, en minimisant les volumes de tous les canaux d'écoulement de ladite tête.
Marks & Clerk
Wang James
LandOfFree
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