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Patent metadata

Field	Value
Publication number	US-9918856-B2
Application number	US-201414900346-A
Country	US
Kind code	B2
Filing date	Jun 20, 2014
Priority date	Jun 21, 2013
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

A spacer including a first part made from a first shape memory material, and a second part made from a second shape memory material.

First claim

The invention claimed is:

1. A stent comprising a filiform element, this element comprising, in transversal cross-section, a first portion made of a shape-memory metal alloy and a second portion made of a shape-memory metal alloy, the first and second portions having different shape-memory properties,
wherein the first portion has a first activation temperature, and the second portion has a second activation temperature higher than the first temperature,
and wherein the first and second portions are arranged so that the stent takes a first expanded configuration when the first portion is activated, and a second contracted configuration when the second portion is activated.

2. The stent of claim 1 , wherein at least one section of the stent has an approximately generally cylindrical shape having a first diameter in the first configuration and a second diameter smaller than the first diameter in the second configuration.

3. The stent of claim 1 , wherein the filiform element has a generally helical shape.

4. The stent of claim 1 , wherein said element has the shape of a diabolo.

5. The stent of claim 1 , wherein the first portion is a hollow wire, and wherein the second portion is a wire of smaller diameter arranged within the hollow wire.

6. The stent of claim 1 , wherein the first and second portions are different areas of the cross-section of a same wire.

7. The stent of claim 1 , wherein the shape-memory alloy of the first and/or the second portion is an alloy based on nickel and titanium.

8. The stent of claim 1 , wherein said filiform element comprises at its ends contact terminals enabling to circulate an electric current in the first and/or second portions.

9. The stent of claim 1 , further comprising a silicone coating.

10. The stent of claim 6 , wherein the filiform element is formed from a wire initially made of a single metal alloy, the wire being first globally treated such that both the first and second portions acquire the same shape-memory properties, and then locally treated to modify the shape-memory properties of only the second portion.

Assignees

• Univ Joseph Fourier
• Centre Nat Rech Scient
• Assist Publique—Hopitaux De Paris
• Univ Grenoble Alpes

Inventors

• Favier Denis
• Mozer Pierre
• Payan Yohan
• Antherieu Gabriel
• Connesson Nathanael

Classifications

• A61M27/008

  pre-shaped, for use in the urethral or ureteral tract · CPC title

• A61F2210/0019

  operated at only one temperature whilst inside or touching the human body, e.g. constrained in a non-operative shape during surgery, another temperature only occurring before the operation · CPC title

• A61F2310/00023

  Titanium or titanium-based alloys, e.g. Ti-Ni alloys · CPC title

• A61F2250/0042

  differing in shape-memory transition temperatures, e.g. in martensitic transition temperature, in austenitic transition temperature · CPC title

• A61F2250/0039

  differing in diameter · CPC title