Tubes and their manufacture

Details Tubes and their manufacture Tubes and their manufacture

A - Human Necessities

61

M

A61M 16/04 (2006.01) F16L 21/00 (2006.01)

Patent

CA 2706187

An end fitting (31) is formed at the patient end of an inner cannula (3) for a tracheostomy tube (1) by punching small holes (33) close to one end (34) of an ePTFE shaft (30). The end is then swaged to form an expanded region (30') and a preformed tubular insert (40) of a thermoplastic material is inserted to cover the holes (33) on the inside. An outer part (46) of the same thermoplastic material is then overmoulded on the outside of the shaft 30 so that its material (47) flows through the holes (33) and bonds with the inner insert (40), thereby securing the inner and outer parts together around the end of the shaft.

L'invention concerne un raccord terminal (31) formé à l'extrémité patient d'une canule interne (3) d'un tube de trachéotomie (1) par perforation de petits trous (33) à proximité d'une extrémité (34) d'un tube (30) en ePTFE. L'extrémité est ensuite emboutie de manière à former une partie dilatée (30') et une garniture tubulaire préformée (40) en matériau thermoplastique est insérée pour recouvrir les trous (33) du côté intérieur. Une pièce extérieure (46) du même matériau thermoplastique est ensuite surmoulée sur l'extérieur du tube (30) de telle sorte que son matériau (47) s'écoule dans les trous (33) et se lie à la garniture intérieure (40) pour ainsi fixer ensemble la pièce extérieure et la pièce intérieure autour de l'extrémité du tube.

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