Balloon Catheter With Non-Deployable Stent

• US 20120245616A1
• Filed: 06/05/2012
• Published: 09/27/2012
• Est. Priority Date: 11/09/2001
• Status: Active Grant

• Current Assignee: Spectranetics LLC (Koninklijke Philips N.V.)
• Original Assignee: Spectranetics LLC (Koninklijke Philips N.V.)
• Inventors: Farnan, Robert C.
• Granted Patent: US 11,571,554 B2
• Time in Patent Office: Days
• US Class Current: 606/194
• CPC Class Codes: A61B 17/320725 with radially expandable cutting or abrading elements A61B17/32075 takes precedence
• CPC Class Codes: A61B 2017/00858 high friction or non-slip
• CPC Class Codes: A61B 2017/22061 for spreading elements apart
• CPC Class Codes: A61F 2/91 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
• CPC Class Codes: A61F 2/915 with bands having a meander structure, adjacent bands being connected to each other
• CPC Class Codes: A61F 2/958 Inflatable balloons for placing stents or stent-grafts
• CPC Class Codes: A61F 2002/91525 within the whole structure different bands showing different meander characteristics, e.g. frequency or amplitude
• CPC Class Codes: A61F 2002/91533 characterised by the phase between adjacent bands
• CPC Class Codes: A61F 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2210/0076 multilayered, e.g. laminated structures
• CPC Class Codes: A61F 2230/005 Rosette-shaped, e.g. star-shaped
• CPC Class Codes: A61F 2230/0058 X-shaped
• CPC Class Codes: A61F 2230/0067 conical
• CPC Class Codes: A61M 2025/105 having a balloon suitable for drug delivery, e.g. by using holes for delivery, drug coating or membranes
• CPC Class Codes: A61M 2025/1081 having sheaths or the like for covering the balloon but not forming a permanent part of the balloon, e.g. retractable, dissolvable or tearable sheaths
• CPC Class Codes: A61M 2025/1086 having a special balloon surface topography, e.g. pores, protuberances, spikes or grooves
• CPC Class Codes: A61M 2025/1088 having special surface characteristics depending on material properties or added substances, e.g. for reducing friction
• CPC Class Codes: A61M 2025/109 having balloons for removing solid matters, e.g. by grasping or scraping plaque, thrombus or other matters that obstruct the flow
• CPC Class Codes: A61M 25/10 Balloon catheters A61M25/0125 takes precedence; embolectomy A61B17/22032; retractors A61B17/02; inflatable balloons for placing stents or stent-grafts A61F2/958 ; stomach balloons for treatment of obesity A61F5/0003; oesophagal tubes A61J15/00
• CPC Class Codes: A61M 25/1027 Making of balloon catheters
• CPC Class Codes: A61M 25/104 : used for angioplasty

Abstract

An angioplasty balloon including a non-deployable stent to prevent or reduce the potential for slippage of the inflated balloon with respect to the vessel wall being treated. The balloon includes a non-deployable stent that is adapted to be secured to the balloon or angioplasty balloon catheter. The stent has a proximal end, a distal end, and at least three radially-spaced struts, each, each strut connecting the proximal end to the distal end and having one or more bends that allow expansion of the strut to accommodate the inflation of the balloon. The stem is made or a material so that the stent collapses upon deflation of the balloon.

Claims

1. A system for performing angioplasty, said system comprising:

a catheter shaft having an inflatable balloon at its distal end;

a constraining structure disposed over the inflatable balloon, said constraining structure having a non-expanded configuration where it lies closely over the balloon prior to inflation and an expanded configuration which is smaller than an unconstrained size of the balloon so that the structure restrains the balloon inflation along a plurality of crossing channel lines.

2. A system as in claim 1, wherein the channel lines are oriented axially circumferentially, or both axially and circumferentially.

3. A system as in claim 2, wherein the constraining structure comprises a plurality of circumferentially spaced-apart axial struts and a multiplicity of axially spaced-apart radially expandable rings attached to the axial struts, wherein the axially struts cross the radially expandable rings.

4. A system as in claim 3, wherein the rings are joined to the struts at intersecting angles in the range from 75°

and 105°

.

5. A system as in claim 4, wherein the intersecting angles are 90°

.

6. A system as in claim 3, wherein the axial struts are joined to the catheter on a distal side of the balloon and a proximal side of the balloon.

7. A system as in claim 6, wherein at least one of a distal end of each strut and a proximal end of each strut can translate axially over the catheter shaft as the balloon is inflated.

8. A system as in claim 6, wherein the individual struts are each elastic in tension so that they will elongate as the balloon is inflated.

9. A system as in claim 8, wherein both ends of each structure are fixedly attached to the catheter shaft.

10. A system as in claim 3, wherein the radially expandable rings are composed of an elastic material which can elongate to allow the ring to expand when the balloon is inflated.

11. A system as in claim 10, wherein the radially expandable rings are formed with deformable features which allow their radial expansion when the balloon is inflated.

12. A system as in claim 11, wherein the deformable features comprise one or more of zig-zags, S-curves, and coils.

13. A method for treating a lesion in a blood vessel, said method comprising:

inflating a balloon within the blood vessel; and

constraining the balloon inflation along a plurality of crossing channel lines, wherein a number of isolated protruding regions contact the lesion while the channel lines are recessed from the vessel wall.

14. A method as in claim 13, wherein the balloon is composed of a non-distensible or semi-compliant material and is inflated to a pressure in the range from 10 atm, to 25 atm.

15. A method as in claim 13, wherein the balloon is constrained along crossing axial and circumferential channel lines to form quadrangular isolated protruding regions.

16. A method as in claim 13, wherein the balloon is coated with a drug that is transferred into the blood vessel wall as the balloon is inflated.

17. A method for treating a non-uniform lesion in a blood vessel, said method comprising:

inflating a balloon within the lesion, wherein the balloon surface is formed into a plurality of discrete protruding regions which each separately engage a segment of the lesion with a localized force applied by each protruding region to avoid excessive pressure applied against any segment of the lesion.

18. A method as in claim 17, wherein the protruding regions are formed by a constraining structure having crossing struts placed over the balloon.

19. A method as in claim 18, wherein the struts lie along axial and circumferential lines to form quadrangular isolated protruding regions.

20. A method as in claim 17, wherein the balloon is formed from a non-distensible or semi-compliant material and is inflated to a pressure in the range from 10 atm to 25 atm.

21. A method as in claim 17, wherein the protruding regions have similar sizes and are uniformly distributed over the balloon surface.