Main vessel constraining side-branch access balloon

• US 20080109056A1
• Filed: 11/03/2006
• Published: 05/08/2008
• Est. Priority Date: 11/03/2006
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Chalekian, Aaron
• Granted Patent: US 8,414,611 B2
• Time in Patent Office: Days
• US Class Current: 623/1.11
• CPC Class Codes: A61F 2/856 Single tubular stent with a side portal passage
• CPC Class Codes: A61F 2/954 for placing stents or stent-grafts in a bifurcation
• CPC Class Codes: A61F 2/958 Inflatable balloons for placing stents or stent-grafts
• CPC Class Codes: A61F 2002/821 Ostial stents
• CPC Class Codes: A61M 2025/1045 for treating bifurcations, e.g. balloons in y-configuration, separate balloons or special features of the catheter for treating bifurcations
• CPC Class Codes: A61M 2025/1065 having a balloon which is inversely attached to the shaft at the distal or proximal end
• CPC Class Codes: A61M 2025/1072 having balloons with two or more compartments
• CPC Class Codes: A61M 25/1002 characterised by balloon shape A61M25/1006, A61M25/1009 take precedence

Abstract

A catheter having a multi-chamber balloon which includes a first chamber having a globular configuration and an adjacent second chamber having a generally cylindrical body portion are sequentially inflatable so when employed to enlarge an opening through a stent deployed at a bifurcation the stent is supported around the circumference of the side-branch opening while the stent wall opening is being enlarged.

Claims

1. A medical device balloon, the balloon having a longitudinal axis and comprising:

a first chamber having a globular configuration with a maximum perpendicular dimension (D1) taken in a plane perpendicular to the longitudinal axis of the balloon and an axial length (D3) which is not more than about 20% greater than the maximum perpendicular dimension (D1), and

an adjacent second chamber having a generally cylindrical body portion which has a diameter (D2) which is less than the first chamber diameter axial length (D3).

2. A medical device balloon as in claim 1 wherein the first chamber has an inwardly inverted conical portion disposed at a generally diametrical opposed location relative to the second chamber.

3. A medical device balloon as in claim 1 wherein the globular configuration of the first chamber is generally spherical.

4. A medical device balloon as in claim 1 wherein the first and second chambers are separated by a imperforate wall.

5. A medical device balloon as in claim 1 wherein the first and second chambers are separated by a wall having one or more perforations or pressure openable valves.

6. A medical device balloon as in claim 1 having an exterior surface and a junction on the exterior surface where the two chambers meet.

7. A medical device balloon as in claim 6 wherein the junction is a circumferential neck which has a diameter less than the diameter (D2) of the second chamber.

8. A medical device balloon as in claim 6 wherein the junction is a neck portion having a minimum perpendicular dimension taken in a plane perpendicular to the longitudinal axis of the balloon that is less the diameter of the second balloon portion.

9. A catheter having a balloon as in claim 1 mounted on a distal portion thereof.

10. A catheter as in claim 9 further comprising separate inflation lumens for each of the first and second chambers.

11. A catheter as in claim 9 further comprising a guide wire lumen passing through the balloon.

12. A catheter as in claim 9 configured as a fixed wire catheter.

13. A catheter as in claim 9 having a single inflation lumen opening into the balloon first chamber and wherein the first and second chambers of the balloon are separated by a wall having one or more perforations or pressure openable valves therein.

14. A catheter as in claim 9 wherein the first chamber has at least a proximal end mounted on the catheter in everted form.

15. A catheter as in claim 9 wherein the first chamber has an inwardly inverted conical portion at its proximal end.

16. A catheter as in claim 9 wherein the globular configuration of the first chamber is generally spherical.

17. A catheter as in claim 9 wherein the globular configuration of the first chamber is generally ellipsoid or ovoid.

18. A method for deploying a stent having at least one side-wall opening at a bifurcation comprising first, second and third vessels, a channel between the first and second vessels and an ostium into the third vessel, the method comprising:

deploying the stent in said channel between the first and second vessels to engage the vessel walls thereof and cross the ostium with a side-wall opening facing the ostium and

enlarging said stent side-wall opening facing the ostium by passing a balloon catheter through the stent side-wall opening and into the third vessel such that the catheter balloon crosses the stent side-wall opening and then expanding the balloon,

wherein the balloon catheter is a catheter as in claim 9.

19. A method as in claim 18 wherein when the balloon is expanded the first chamber is located in the interior of the stent and the second chamber crosses the stent side-wall and enters the third vessel.

20. A method as in claim 18 wherein the first and second chambers of the balloon are expanded sequentially so that the first chamber is substantially fully inflated before the second chamber is expanded sufficiently to substantially enlarge the stent side-wall opening.

21. A method as in claim 19 wherein the balloon has an exterior surface and a junction on the exterior surface where the two chambers meet and when the balloon is expanded it is located so that the junction engages the stent side-wall opening and the first chamber supports the stent from deflecting into said channel as the side-wall opening is enlarged.