Assembly comprising a stabiliser and an instrument to be positioned in or around a passage surrounded by body tissue

1. An assembly, comprising:

a vacuum source;

a tissue stabilizer comprising a tubular working duct and a loop-shaped suction nozzle;

a suction line; and

an instrument,

the tubular working duct having a length and a diameter extending transverse to the length,

the loop-shaped suction nozzle having a single suction opening extending over the entire circumference of the distal end of the working duct, said single suction opening being operationally connected to the vacuum source,

the instrument being sized so as to be removably insertable through the tubular working duct, and

the suction line extending from the vacuum source to the single suction opening, wherein the suction line is operationally separate from the working duct.

2. The assembly according to claim 1 , further comprising a closure adapted for closing an axial passage through the working duct.

3. The assembly according to claim 1 , wherein said single suction opening is an axial suction opening, which opens in the axial direction, viewed with respect to the working duct.

4. The assembly according to claim 1 , wherein said single suction opening is a radial suction opening, opening in the radially outward direction, viewed with respect to the working duct.

5. The assembly according to claim 1 , wherein said single suction opening is a radial suction opening, opening in the radially inward direction, viewed with respect to the working duct.

6. The assembly according to claim 1 , wherein said single suction opening is an inclined suction opening, opening outwards obliquely with respect to the axial direction, viewed with respect to the working duct.

7. The assembly according to claim 1 , wherein said single suction opening is an inclined suction opening, opening inwards obliquely with respect to the axial direction, viewed with respect to the working duct.

8. The assembly according to claim 1 , wherein one or more valves are arranged within the working duct, which valves allow passage of said instrument.

9. The assembly according to claim 8 , wherein the one or more valves comprise flapping or sphincteral parts.

10. The assembly according to claim 1 , wherein the working duct is a hollow double walled working duct and wherein the suction line comprises a suction passage formed in the interior of the wall of the double walled working duct.

11. The assembly according to claim 1 , wherein the suction line comprises at least one axial suction duct, the at least one axial suction duct being located in the wall of the working duct.

12. The assembly according to claim 1 , wherein, when viewed in an axial direction, the working duct is curved.

13. The assembly according to claim 1 , wherein, when viewed in an axial direction, the working duct is bendable or flexible.

14. The assembly according to claim 1 , wherein the stabilizer is configured so as to allow the removable insertion of the instrument through the open proximal end of the working duct while the vacuum source is applying a vacuum to said single suction opening of the loop-shaped suction nozzle.

15. The assembly according to claim 1 , wherein the instrument comprises a heart valve prosthesis and wherein the working duct is sized so as to enable insertion of the valve prosthesis through the tubular working duct.

16. The assembly according to claim 1 , wherein the instrument has a diameter of 4 cm or less.

17. The assembly according to claim 1 , wherein the instrument has a diameter of 1 to 3 cm.

18. The assembly according to claim 1 , wherein the stabilizer and the instrument are provided with, respectively, an instrument stop provided on the stabilizer and a stabilizer stop provided on the instrument, which stops define a stop position when in contact with one another, and wherein, when the instrument is inserted through the proximal end of, and into, the working duct and the stops are in the stop position, the stops unambiguously define the position of a head section of the instrument with respect to the position of the loop-shaped suction nozzle.

19. The assembly according to claim 18 , further comprising a guide on the stabilizer on which the instrument stop is provided such that it can slide along the guide and with respect to which the instrument stop can be locked, wherein the guide is provided at the proximal end of the working duct and has a direction of extension essentially transverse to the loop-shaped suction nozzle.

20. The assembly according to claim 19 , wherein the stabilizer is provided with said guide, and wherein the suction nozzle and the guide are firmly linked to one another in such a way that the mutual positions of the loop-shaped suction nozzle and guide are fixed with respect to one another.

21. The assembly according to claim 20 , wherein the guide is provided with a scale with a zero point and wherein the distance from the zero point to the loop-shaped suction nozzle is chosen such that when the instrument stop and stabilizer stop are in the stop position and aligned with the zero point, the head section is located at the distal end of the stabilizer.

22. The assembly according to claim 1 , wherein the stabilizer further comprises a flange provided at the distal end of the working duct, said flange extending in a radially outward direction with respect to the working duct, and wherein the flange is provided with said single suction opening.

23. The assembly according to claim 1 , wherein said single suction opening has a ring-shaped, circular, ellipsoidal, oval-like, tubular, saddle-shaped, 3-fold sine shaped, bean-shaped or kidney-shaped contour.

24. The assembly according to claim 1 , wherein part of the suction line is accommodated in the wall of the working duct.