Apparatus for configuring an arteriovenous fistula

1. An apparatus for configuring first and second blood vessels connected by an anastomosis at a fistula, the apparatus comprising:

a coupler shaped to comprise the following portions:

a mount having a saddle-like shape comprising a convex face surface, a concave face surface configured to seat on and couple to the first blood vessel, and an aperture, the mount having a first side and a second side;

a brace having a first side and a second side, the first side of the brace coupled to the first side of the mount, and the second side of the brace coupled to the second side of the mount, wherein the brace comprises two legs extending from the mount that are closable to form a ring-like shape, such that the mount and the brace together encircle the first blood vessel, to secure the mount to the first blood vessel;

an adapter having a first open end, a lumen, and a second open end, wherein the first open end is contiguous with the aperture comprised in the mount and the adapter is shaped to extend from the mount on the side of the convex face surface in the vicinity of the fistula; and

an intermediate portion that is shaped to gradually alter in shape from the shape of the mount to the shape of the adapter; and

a sleeve that is connectable to the second open end of the adapter and is configured to

ensheathe and hold a portion of the second blood vessel, wherein

the sleeve does not extend beyond the first open end when connected to the adapter.

2. The apparatus according to claim 1 wherein an acute angle formed between the first and second blood vessels at the fistula is greater than about 20° and is less than about 60°.

3. The apparatus according to claim 1 wherein the sleeve has a cross section that increases as a function of distance along the sleeve from the coupler for at least a first portion of the sleeve length.

4. The apparatus according to claim 3 wherein the cross section of the sleeve increases as a function of distance from the coupler along the sleeve beginning from the sleeve opening proximal to the fistula.

5. The apparatus according to claim 3 wherein the sleeve has a second portion that extends from an end of the first portion to an end of the sleeve and has a substantially same cross section at each point along the length of the second portion.

6. The apparatus according to claim 1 , wherein the sleeve assumes a substantially circular cross section proximal to the fistula having an internal diameter substantially equal to or greater than an external diameter of the first blood vessel.

7. The apparatus according to claim 1 wherein the coupler is operable to impose a rounded contour to at least a portion of the first or second blood vessel apposed to the coupler.

8. The apparatus according to claim 7 , wherein the coupler is operable to impose a rounded contour to a portion of the first or second blood vessel at an angle formed by the junction of the first and second blood vessels.

9. The apparatus according to claim 1 wherein the first blood vessel is a brachial artery or a radial artery and the second blood vessel is a cephalic vein.

10. The apparatus according to claim 1 , wherein the sleeve does not make contact with the first blood vessel or with blood flowing in the first blood vessel.

11. An apparatus for configuring first and second blood vessels connected by an anastomosis at a fistula, the apparatus comprising:

a coupler shaped to comprise the following portions:

a mount having a saddle-like shape comprising a convex face surface, a concave face surface configured to seat on and couple to the first blood vessel, and an aperture;

a brace shaped to extend from the mount and configured around the exterior of the first blood vessel, wherein the brace comprises two legs extending from the mount that are closable to form a ring-like shape so as to encircle a circumference of the exterior surface of the first blood vessel, so as to secure the mount to the first blood vessel;

an adapter having a first open end, a lumen, and a second open end, wherein the first open end is contiguous with the aperture comprised in the mount and the adapter is shaped to extend from the mount on the side of the convex face surface in the vicinity of the fistula;

an intermediate portion that is shaped to gradually alter in shape from the shape of the mount to the shape of the adapter; and

a sleeve that is connectable to the second open end of the adapter and is configured to

ensheathe and hold a portion of the second blood vessel, wherein

the sleeve does not extend beyond the first open end when connected to the adapter.

12. The apparatus according to claim 11 wherein an acute angle formed between the first and second blood vessels at the fistula is greater than about 20° and is less than about 60°.

13. The apparatus according to claim 11 wherein the sleeve has a cross section that increases as a function of distance along the sleeve from the coupler for at least a first portion of the sleeve length.

14. The apparatus according to claim 13 wherein the cross section of the sleeve increases as a function of distance from the coupler along the sleeve beginning from the sleeve opening proximal to the fistula.

15. The apparatus according to claim 13 wherein the sleeve has a second portion that extends from an end of the first portion to an end of the sleeve and has a substantially same cross section at each point along the length of the second portion.

16. The apparatus according to claim 11 , wherein the sleeve assumes a substantially circular cross section proximal to the fistula having an internal diameter substantially equal to or greater than an external diameter of the first blood vessel.

17. The apparatus according to claim 11 wherein the coupler is operable to impose a rounded contour to at least a portion of the first or second blood vessel apposed to the coupler.

18. The apparatus according to claim 17 , wherein the coupler is operable to impose a rounded contour to a portion of the first or second blood vessel at an angle formed by the junction of the first and second blood vessels.

19. The apparatus according to claim 11 wherein the first blood vessel is a brachial artery or a radial artery and the second blood vessel is a cephalic vein.

20. The apparatus according to claim 11 , wherein the sleeve does not make contact with the first blood vessel or with blood flowing in the first blood vessel.

21. An apparatus for supporting first and second blood vessels connected by an anastomosis at a fistula, the apparatus comprising:

an integrally formed coupler shaped to comprise the following portions:

a mount having a saddle-like shape comprising a convex face surface, a concave face surface configured to seat on and couple to the first blood vessel, and an aperture;

a brace shaped to extend from the mount wherein the brace comprises two legs extending from the mount that are closable to form a ring-like shape, such that the brace and mount together encircle the first blood vessel to secure the mount to the first vessel;

an adapter having a first open end, a lumen, and a second open end, wherein the first open end is contiguous with the aperture comprised in the mount and the adapter is shaped to extend from the mount on the side of the convex face surface in the vicinity of the fistula; and

an intermediate portion that is shaped to gradually alter in shape from the shape of the mount to the shape of the adapter;

wherein the coupler portions of the mount, the brace, the adapter, and the intermediate portion are integrally formed;

and

a sleeve that is connectable to the second open end of the adapter and is configured to ensheathe and hold a portion of the second blood vessel, wherein the sleeve does not extend beyond the first open end when connected to the adapter.

22. The apparatus according to claim 21 , wherein the coupler, comprising said integrally formed portions, is formed as a singular or monolithic structure.

23. The apparatus according to claim 21 , wherein the coupler is formed from a metal piece having a plurality of slender struts with openings therebetween.

24. The apparatus according to claim 21 , wherein the coupler is formed as a singular or monolithic structure comprising a metal piece having a plurality of slender struts with openings therebetween.