Maintaining an open passageway through a body lumen

A - Human Necessities – 61 – F

Patent

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Details

A61F 2/06 (2006.01) A61F 2/00 (2006.01) A61F 2/04 (2006.01)

Patent

CA 2458117

A stent for maintaining an open passageway through a body lumen, such as the prostatic urethra of a male patient, includes a coil segment and a flexible polymer material encapsulating the coil segment. The coil segment defines a lumen extending therethrough and includes a distal portion, a middle portion, and a proximal portion. Both the distal and proximal portions of the coil segment have a greater outer diameter in comparison to the middle portion, so as to enhance retention of the stent after placement within the patient's body. The coil segment is made from a wound element that includes one or more spaced windings. The flexible polymer material is disposed between adjacent spaced winding to form an imperforate flexible webbing that encapsulates the coil segment and prevents the growth of tissue between the windings and into the coil segment's lumen when the stent is placed within the patient.

La présente invention concerne une endoprothèse vasculaire permettant de maintenir une voie de passage dans une lumière corporelle, telle que l'urètre prostatique d'un patient de sexe masculin. Ladite endoprothèse comprend un segment de spirale et un matériau polymère souple encapsulant le segment de spirale. Ledit segment de spirale définit une lumière s'étendant à l'intérieur dudit segment et comprend une partie distale, une partie intermédiaire et une partie proximale. Les parties distale et proximale du segment de spirale présentent un diamètre extérieur plus important comparé à la partie intermédiaire, de manière à favoriser la retenue de l'endoprothèse vasculaire après son placement dans le corps d'un patient. Ledit segment de spirale est constitué d'un élément enroulé qui comprend une ou plusieurs spires espacées. Ledit matériau polymère souple est placé entre des spires espacées adjacentes pour former une toile souple imperforée qui encapsule le segment de spirale et empêche la croissance tissulaire entre les spires et dans la lumière du segment de spirale lorsque l'endoprothèse vasculaire est placée chez le patient.

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