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Softening expanding ureteral stent

  • US 5,599,291 A
  • Filed: 01/04/1993
  • Issued: 02/04/1997
  • Est. Priority Date: 01/04/1993
  • Status: Expired due to Term
First Claim
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1. A ureteral stent comprising an elongated member having a proximal end portion and a distal end portion joined by a body portion, the elongated member having an initial member outer diameter and including retention means for retaining the stent within a ureter, the member being formulated of a physiologically acceptable polymer capable of hydrating with concurrent softening and with concurrent expanding from the initial member outer diameter to form a final member outer diameter, the polymer being formulated such that upon hydration the member softens and expands to different degrees at different locations therealong, wherein the elongated member has an initial stiffness above about 100 Shore A and wherein upon hydration the initial stiffness of the distal end portion softens to a final softness which falls below 100 Shore A.

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