Post dilation balloon with marker bands for use with stented valves
A bulbous valvuloplasty balloon is described that maintains its bulbous shape in its final deployed configuration along with the method of use for post dilation of a TAVR device. The bulbous balloon has two larger diameter bulb segments located on each side of a smaller diameter waist and can be used to post dilate a TAVR device that has been implanted at the site of a stenotic aortic valve. The post dilation causes deformation of the underlying tissues residing outside of the TARV stent structure.
1. A bulbous balloon for post dilating a stent structure that has been implanted in a human body, said balloon comprising:
A. a fully inflated distal bulb section that is at least 3 mm larger in diameter than a fully inflated diameter of a proximal balloon section;
B. a waist portion located between the distal bulb section and the proximal balloon section, and the waist portion retaining a smaller fully inflated diameter than a fully inflated diameter of said proximal balloon section;
C. said balloon having a stent located over said waist portion and over said distal bulb section that is adjacent to the proximal balloon section, said stent being expandable from a small diameter configuration to a larger diameter configuration and is configured for generating an outward force against the stent structure during expanding to cause the stent structure to move outwards;
D. said balloon being configured such that said proximal balloon section applies a smaller force outwards against surrounding tissues than a force applied by said distal bulb section against surrounding tissues.
2. A bulbous balloon of claim 1 , wherein as the bulbous balloon is fully inflated, said stent makes contact along its perimeter with the stent structure to force the stent structure outwards thereby reducing or eliminating a gap between the stent structure and tissues surrounding the stent structure and thereby reducing leakage of blood around the stent structure.
3. The bulbous balloon of claim 2 , wherein said distal bulb section is formed from a braided structure, said braided structure providing for enlargement in diameter as the length is reduced, the braided structure providing for blood flow through said distal bulb section, said distal bulb section being slidable with respect to said proximal balloon section.
4. The bulbous balloon of claim 2 , wherein said distal bulb section is a distal balloon section that shares a same luminal space as the proximal balloon section.
5. The bulbous balloon of claim 2 , wherein said distal bulb section is a distal balloon section having a separate luminal space from said proximal balloon section, said distal balloon section being configured to be inflated via a separate inflation lumen prior to said proximal balloon section.
6. The bulbous balloon of claim 1 , wherein the stent is located on said distal bulb section, and a length of the portion of the distal bulb section that the stent covers is not greater than a length of an another portion of the distal bulb that is not covered by the stent, and wherein the lengths of the portion and the another portion are measured along a longitudinal direction of the balloon.
7. A bulbous balloon for performing valvuloplasty on a valve of the heart, said balloon comprising:
A. a fully inflated distal balloon portion that is at least 3 mm larger in diameter than a fully inflated diameter of a proximal balloon portion; a waist portion located between the distal balloon portion and the proximal balloon portion, and the waist portion retaining a smaller fully inflated diameter than a fully inflated diameter of said proximal balloon portion;
B. said balloon having a marker band in the form of stretchable wire located along a perimeter of said proximal balloon portion;
C. said balloon configured to position said distal balloon portion upstream of the annulus;
D. said balloon configured to place said proximal balloon section adjacent the valve annulus;
E. said balloon being configured such that said proximal balloon portion applies a smaller force outwards against the annulus than a force applied by said distal balloon portion against the surrounding tissues of the heart valve; and,
F. a stent disposed over said waist portion and one of said proximal balloon portion or said distal balloon portion.
8. The bulbous balloon of claim 7 , wherein said marker band is a radiopaque band formed from metal particles embedded in a polymer matrix and bonded to the outside surface of the balloon.
9. The bulbous balloon of claim 7 , wherein said marker band is an echogenic band formed from an echogenic material bonded to an outside surface of the balloon.
10. The bulbous balloon of claim 9 , wherein said echogenic material comprises echogenic particles formed from flat metal particles embedded in a polymer matrix.
11. The bulbous balloon of claim 9 , wherein said echogenic material comprises echogenic particles formed from gas-filled particles.
12. The bulbous balloon of claim 9 , wherein said echogenic material comprises echogenic particles having a natural frequency of 2 to 20 MHz and absorb and reflect sound waves.
13. The bulbous material of claim 9 , wherein said echogenic material comprises a conductive material, said conductive material being provided with a current that has a frequency ranging from 2 to 20 MHz.
14. The bulbous balloon of claim 13 , wherein said conductive material comprises metal particles embedded in a polymer matrix formed from a conductive polymer.
15. The bulbous balloon of claim 13 , wherein said conductive material comprises a conductive metal wire bonded to the outside surface of the balloon, said wire being formed into a configuration that allows for diametric expansion of said balloon.
16. The bulbous balloon of claim 7 , wherein the marker band is a conductive wire.
17. The bulbous balloon of claim 7 , wherein the marker band is a wire in a zig-zag shape or a spiral shape.
18. A bulbous balloon for performing valvuloplasty, the bulbous balloon comprising:
A. a proximal balloon portion;
B. a distal balloon portion has a fully inflated diameter that is at least 3 mm larger than a fully inflated diameter of the proximal balloon portion;
C. a waist portion located between the distal balloon portion and the proximal balloon portion, and the waist portion retaining a smaller fully inflated diameter than a fully inflated diameter of said proximal balloon portion;
D. a marker band located along a perimeter of the balloon, the marker band being a discontinuous band comprised of a series of dots or dashes that extend around a circumference of the balloon;
E. a stent disposed over said waist portion and over said distal balloon portion and/or said proximal balloon portion.
19. The bulbous balloon of claim 18 , wherein the marker band is a radiopaque band formed from metal particles embedded in a polymer matrix and bonded to the outside surface of the balloon.
20. The bulbous balloon of claim 18 , wherein the marker band is an echogenic band formed from an echogenic material bonded to an outside surface of the balloon.
21. The bulbous balloon of claim 18 , wherein the bulbous balloon comprises a second marker band, and the two marker bands are respectively located on perimeters on the proximal balloon portion and the distal balloon portion.
22. The bulbous balloon of claim 21 , wherein the second marker band is a solid or continuous band.
23. The bulbous balloon of claim 21 , wherein the second marker band is a discontinuous band comprised of a series of dots or dashes that extend around a circumference of the balloon.
24. The bulbous balloon of claim 18 , wherein the bulbous balloon comprises a second marker band and a third marker band, the three marker bands are respectively located on the proximal balloon portion, the distal balloon portion and the waist portion.
25. The bulbous balloon of claim 24 , wherein at least one of the second marker band and the third marker band is a solid or continuous band.
26. The bulbous balloon of claim 25 , wherein at least one of the second marker band and the third marker band is a discontinuous band comprised of a series of dots or dashes that extend around a circumference of the balloon.