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Stent for biliary, urinary or vascular system

  • US 5,466,242 A
  • Filed: 02/02/1994
  • Issued: 11/14/1995
  • Est. Priority Date: 02/02/1994
  • Status: Expired due to Fees
First Claim
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1. A stent for a biliary, urinary or vascular system, the stent being made of a shape memory alloy having an Austenite finished temperature ranging from 41°

  • to 43°

    C. and having a first configuration at a temperature below the Austenite finished temperature and a second expanded configuration at or above the Austenite finished temperature and wherein in the first configuration, a proximal cylindrical portion (1), a distal cylindrical portion (2) and an interspace (3) connecting the two portions (1 ,2) therebetween, through which a portion of a catheter is bulged out to facilitate positioning of the stent in the system, and in the second configuration, the distal portion (2) expands in diameter, the proximal portion (1) is flared away from the expanded distal portion (2), and the interspace (3) is reduced to be absorbed into a shape directly combining the portions (1,

         2) so that the stent becomes funnel-shaped to be reliably anchored by the flared proximal portion (1) after the positioning.

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