Stent

A - Human Necessities – 61 – F

Patent

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Details

A61F 2/04 (2006.01) A61M 25/00 (2006.01)

Patent

CA 2411516

There is provided an indwelling ureteral (ureteric) stent comprised of a hollow flexible tube with an upper end section, a substantially straight middle section and a lower end section. The upper and lower sections are preferably coiled. The coiled upper section has a diameter between 1 and 2.5 cm which retains the upper section of the stent in the kidney, and has perforations in the surface to allow drainage of urine from the kidney into the tube. The lower coiled section of the stent is G-shaped. The tip of this lower section assumes the horizontal portion of the G shape and contains an integral valve. The integral valve maintains an open flow of urine from the kidney to the bladder, but prevents the reflux of urine into the kidney during bladder contraction. The stent further comprises a small cuff or series of studs behind said valve against which a stent pusher may rest.

L'invention concerne une endoprothèse urétérale à demeure comprenant un tube souple creux constitué d'une section d'extrémité supérieure, d'une section moyenne sensiblement droite et d'une section d'extrémité inférieure. Les sections d'extrémités supérieure et inférieure sont de préférence enroulées. Le diamètre de la section supérieure enroulée, qui est compris entre 1,0 et 2,5 cm, permet de retenir la section supérieure de l'endoprothèse dans le rein et comporte sur sa surface des perforations permettant de drainer l'urine du rein par le tube. La section inférieure enroulée de l'endoprothèse est en forme de G. Le bout de cette section inférieure assure la partie horizontale de la forme en G et contient un clapet intégré. Ce clapet maintient un écoulement d'urine du rein vers la vessie mais permet d'empêcher un retour d'urine dans le rein lors de contraction de la vessie. L'endoprothèse comprend, en outre, un petit renflement ou une série de plaquettes, placées derrière le clapet, contre lesquelles peut venir buter un pousseur d'endoprothèse.

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