Endorectal trocar

1. An endorectal trocar provided with:

a—a body ( 1 ) for endorectal introduction that defines an open internal channel ( 21 ), and

b—a leak-tight barrier ( 2 ) that extends across the internal channel ( 21 ) and exhibits passageways ( 9 , 10 , 11 , 12 ) for engaging rectoscopy instruments,

wherein the body ( 1 ) and the leak-tight barrier ( 2 ) are two distinct assemblies that can be attached by fixing means ( 6 ) at the internal channel ( 21 ),

wherein the leak-tight barrier is arranged substantially at mid length of the internal channel according to a mobile assembly,

wherein the leak-tight barrier comprises a driving surface ( 8 ) configured to accept a handling means of the leak-tight barrier ( 2 ) from outside the internal channel ( 21 ), said handling means being configured in the form a handle ( 13 ) with arms ( 15 ) to cooperate with the driving surface ( 8 ) of the leak-tight barrier, and

wherein the positioning or removal of the leak-tight barrier is performed by an additional rotation operation of the leak-tight barrier with respect to the body ( 1 ).

2. The trocar according to claim 1 , wherein the handling means comprises a handle ( 13 ) having a distal end that cooperates together in an adjustable manner with the leak-tight barrier ( 2 ).

3. The trocar according to claim 2 , wherein the distal end of the handle ( 13 ) comprises at least two arms ( 15 ) that can be applied to a carrier face of the leak-tight barrier ( 2 ).

4. The trocar according to claim 3 , wherein the arms ( 15 ) are elastically deformable between a position of being applied to the carrier face and a free position.

5. The trocar according to claim 4 , wherein the handle ( 13 ) comprises a sleeve ( 14 ) with an elastically deformable zone configured to produce the elastic deformation of the arms ( 15 ).

6. The trocar according to claim 5 , wherein the elastically deformable zone comprises a recess ( 17 ) oriented along the longitudinal direction of the handle ( 13 ) and formed so as to define a deformable border ( 18 ) linked to the arms ( 15 ).

7. The trocar according to claim 1 , that comprises a dilation means ( 25 ) with a distal end becoming progressively wider and suitable for working together with the internal channel ( 21 ) in the absence of the leak-tight barrier ( 2 ).

8. The trocar according to claim 7 , wherein an exterior surface of the dilation means ( 25 ) meets with a distal boundary ( 22 ) of the body ( 1 ).

9. The trocar according to claim 8 , wherein the distal end of the dilation means exhibits a rounded exterior surface.

10. The trocar according to claim 8 , wherein the body ( 1 ) and the dilation means ( 25 ) can be attached by the fixing means at the internal channel ( 21 ).

11. The trocar according to claim 7 , wherein the distal end of the dilation means exhibits a rounded exterior surface.

12. The trocar according to claim 11 , wherein the body ( 1 ) and the dilation means ( 25 ) can be attached by the fixing means at the internal channel ( 21 ).

13. The trocar according to claim 7 , wherein the body ( 1 ) and the dilation means ( 25 ) can be attached by the fixing means at the internal channel ( 21 ).

14. The trocar according to claim 1 , further comprising a longitudinal channelway ( 19 ) in the wall of the body ( 1 ) that receives an inlet tube ( 20 ) for an inflation fluid.

15. The trocar according to claim 14 , wherein an opening of the channelway ( 19 ) to the distal end of the trocar has a transverse component.

16. The trocar according to claim 1 , wherein the leak-tight barrier ( 2 ) comprises a distal side ( 4 ) cooperating with a proximal side ( 5 ) between which a sealing part ( 3 ) is arranged and taken up and wherein the leak-tight barrier ( 2 ) is provided with drive surfaces to cooperate with the handle ( 1 ), the means being slots formed on the proximal side ( 5 ) of the barrier.