Cannula and method of manufacture and use

Details Cannula and method of manufacture and use Cannula and method of manufacture and use

A - Human Necessities

61

M

A61M 1/00 (2006.01) A61M 5/00 (2006.01) A61M 25/00 (2006.01)

Patent

CA 2284784

A cannula (372) having reinforced sections (386) and nonreinforced sections (388), the nonreinforced sections (388) having openings (390) communicating with the lumen of the cannula (372). The nonreinforced sections (388) are plain tubing and the reinforced sections (386) are formed by winding a coated elongate member (207) in a helical manner around a mandrel (213). The coated elongate member (207) preferably has a square cross-sectional shape so that adjacent portions of the coated elongate member (207) engage one another when the coated elongate member (207) is wound around the mandrel (213). The coated elongate member (207) is then heated so that the coating (229, 231) on adjacent portions of the coated elongate member (207) fuses together to form an integral structure. Another layer of material (225) may be provided on the radially inner or outer wall of the coated elongate member. The resulting tubular body (205) is reinforced by the elongate member (207) which is encased in the fused coating (229, 231). The tubular body (205) is cut into sections which are fused to the plain tubing sections (388) to form the cannula.

L'invention concerne une canule (372) constituée de parties renforcées (386) et de parties non renforcées (388) qui comportent des ouvertures (390) communiquant avec la lumière de la canule (372). Les parties non renforcées (388) sont des tubes ordinaires tandis que les parties renforcées (386) sont formées par enroulement hélicoïdal d'un élément oblong revêtu (207) autour d'un mandrin (213). De préférence, l'élément oblong revêtu (207) présente une section carrée, de sorte que les parties adjacentes de l'élément oblong revêtu (207) viennent en contact les unes avec les autres lorsque l'élément oblong revêtu (207) est enroulé autour du mandrin (213). L'élément oblong revêtu (207) est ensuite chauffé de sorte que le revêtement (229, 231) de parties adjacentes de l'élément oblong revêtu (207) fusionnent, de manière à former une structure d'une seule pièce. Une autre couche de matière (225) peut être appliquée sur la paroi intérieure ou extérieure de l'élément oblong revêtu. Le corps tubulaire (205) obtenu est renforcé par l'élément oblong (207), lequel est recouvert du revêtement fondu (229, 231). Le corps tubulaire (205) est découpé en parties qui sont reliées par fusion aux parties (388) constituées de tubes ordinaires, de manière à former la canule.

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