COLLAPSIBLE, SHAPE MEMORY ALLOY STRUCTURES AND FOLDING FIXTURES FOR COLLAPSING SAME

• US 20150148886A1
• Filed: 11/21/2014
• Published: 05/28/2015
• Est. Priority Date: 05/21/2012
• Status: Active Grant

• Current Assignee: Medplate Lifesciences Corporation
• Original Assignee: Medplate Lifesciences Corporation
• Inventors: Briganti, Richard Thomas, Black, Michael D., Chen, Mike Y., Rao, Rob K.
• Granted Patent: US 9,622,885 B2
• Time in Patent Office: Days
• US Class Current: 623/1.18
• CPC Class Codes: A61F 2/07 Stent-grafts
• CPC Class Codes: A61F 2/2412 with soft flexible valve members, e.g. tissue valves shaped like natural valves check valves with flexible valve members in general F16K15/14
• CPC Class Codes: A61F 2/2418 Scaffolds therefor, e.g. support stents
• CPC Class Codes: A61F 2/82 Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents stent-grafts for tubular structures of the body other than blood vessels A61F2/04; stent-grafts for blood vessels A61F2/07; instruments specially adapted for placement or removal of stents or stent-grafts A61F2/95; for closing wounds, or holding wounds closed A61B17/04 - A61B17/115; dilators A61M29/00
• CPC Class Codes: A61F 2210/0014 using shape memory or superelastic materials, e.g. nitinol
• CPC Class Codes: A61F 2230/0069 cylindrical
• CPC Class Codes: A61L 2400/16 Materials with shape-memory or superelastic properties
• CPC Class Codes: A61L 27/04 Metals or alloys
• CPC Class Codes: A61L 31/022 Metals or alloys
• CPC Class Codes: A61L 31/14 Materials characterised by their function or physical properties , e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
• CPC Class Codes: B23K 35/0222 for use in soldering, brazing B23K35/0205 takes precedence
• CPC Class Codes: B23K 35/0255 for use in welding B23K35/0205 takes precedence
• CPC Class Codes: B23K 35/32 with the principal constituent melting at more than 1550 degrees C
• CPC Class Codes: B32B 1/08 Tubular products
• CPC Class Codes: B32B 15/01 all layers being exclusively metallic making layered metal workpieces by pressure cladding B23K20/22; making coatings with a metallic material characterised by its composition C23C30/00
• CPC Class Codes: B32B 2307/718 Weight, e.g. weight per square meter
• CPC Class Codes: B32B 2535/00 Medical equipment, e.g. bandage, prostheses, catheter medical patches B32B2556/00
• CPC Class Codes: B32B 7/05 the layers not being connected over the whole surface, e.g. discontinuous connection or patterned connection using interposed adhesives or bonding materials applied in spaced arrangements B32B7/14
• CPC Class Codes: C22C 19/03 based on nickel
• CPC Class Codes: C22C 19/058 without Mo and W
• CPC Class Codes: C22C 27/02 : Alloys based on vanadium, niobium, or tantalum

Abstract

A shape memory alloy structure comprises at least one tubular member formed of shape memory material, each tubular member including a plurality of panels having side edges, wherein each tubular member is moveable between a radially contracted position and a radially extended position, and wherein the coupled side edges of adjacent panels of each tubular member form hinges for moving the structure between the contracted position and the extended position. Multiple layer tubular structures, methods for forming and fixtures for collapsing same are also disclosed.

Claims

1. A shape memory alloy structure comprising at least one tubular member formed of shape memory material, each tubular member including a plurality of panels having side edges, wherein each tubular member is moveable between a radially contracted position and a radially extended position, and wherein the coupled side edges o f adjacent panels o f each tubular member form hinges for moving the structure between the contracted position and the extended position.

2. The shape memory alloy structure according to claim 1 wherein the shape memory alloy is a nitinol structure, and wherein the panels forming each tubular member are concave members,

3. The shape memory alloy structure according to claim 2 including a plurality of tubular members, wherein each tubular member forms a layer of the structure and wherein the adjacent panels of adjacent layers form channels between the layers.

4. The shape memory alloy structure according to claim 3 wherein the effective outer diameter of the structure in the radially extended position is at least twice the effective outer diameter of the structure in the radially contracted position.

5. A shape memory alloy structure comprising at least one tubular member formed of shape memory alloy, each tubular member formed of a plurality of concave panels wherein circumferentially adjacent panels are coupled at substantial tangential portions of each circumferentially adjacent panels, and wherein each tubular member is formed for movement of the shape memory alloy structure between a contracted position and a radially extended position.

6. The shape memory alloy structure according to claim 5 wherein the structure includes a plurality of tubular members forming layers of the structure.

7. The shape memory alloy structure according to claim 6 wherein the adjacent panels of adjacent layers form channels between the layers.

8. The shape memory alloy structure according to claim 7 further including at least one medicament within at least one of the channels.

9. The shape memory alloy structure according to claim 6 wherein at least an outer facing surface of an outermost of the layers has distinct surface finish from an inner facing surface of an innermost of the layers.

10. The shape memory alloy structure according to claim 6 wherein one of the outer facing surface of the outermost of the layers and the inner facing surface of the innermost of the layers is substantially uniformly perforated and the other is substantially solid.

11. The shape memory alloy structure according to claim 6 wherein the structure is moveable between a radially contracted position and a radially extended position, wherein the effective outer diameter of the structure in the radially extended position is at least twice the effective outer diameter of the structure in the radially contracted position.

12. The shape memory alloy structure according to claim 5 wherein the effective outer diameter of the structure in the radially extended position is at least 3.8 times the effective outer diameter of the structure in the radially contracted position.

13. The shape memory alloy structure according to claim 5 wherein the shape memory alloy is a nitinol structure and wherein the effective outer diameter of the structure in the radially contracted position is less than about 6 mm.

14. The shape memory alloy structure according to claim 13 wherein the structure is a prosthetic cardiovascular stent.

15. The shape memory alloy structure according to claim 5 wherein the panels forming at least one tubular member are substantially solid concave members.

16. A s hap e memory alloy structure comprising at least two substantially concentric tubular members formed of shape memory alloy, each tubular member formed of a plurality of scalloped panels separated by peaks, and wherein at least some of the peaks of at least one concentrically inner of the tubular members are aligned with adjacent peaks of the immediately outwardly adjacent tubular member.

17. The shape memory alloy structure according to claim 16 wherein the structure is moveable between a radially contracted position and a radially extended position, wherein the effective outer diameter of the structure in the radially extended position is at least 3.8 times the effective outer diameter of the structure in the radially contracted position.

18. The shape memory alloy structure according to claim 16 wherein the shape memory alloy is a nitinol structure and wherein the effective outer diameter of the structure in the radially contracted position is less than about 6 mm.

19. The shape memory alloy structure according to claim 16 wherein the structure is a prosthetic cardiovascular stent.

20. The shape memory alloy structure according to claim 16 wherein the scalloped panels forming at least one of the tubular members are substantially solid.

21-40. -40. (canceled)