Working channel element, endoscope with a working channel element, and method for using a working channel in an endoscope

1. A working channel instrument for an endoscope, the working channel instrument comprising:

a working channel element having a tubular shape which has an inner circumference and an outer circumference and through which an instrument can be pushed;

a bending portion located on a distal side of the working channel element;

an actuator that controls the bending of the bending portion, the actuator comprising a hollow cylinder rod element having has a lateral slit extending in a longitudinal direction of the hollow cylinder rod element, wherein the actuator is located on a proximal side thereof;

a slider arranged on the hollow cylinder rod element and configured to slide along on the hollow cylinder rod element in the longitudinal direction thereof;

a tension wire anchored on the slider such that the bending portion is bendable by the tension wire; and

a lock located on the slider, wherein in the lock is:

guidable in the lateral slit of the hollow cylinder rod element, and

lockable in a selected longitudinal displacement position of the slider relative to the hollow cylinder rod element, and

wherein the working channel element is adapted to be temporarily inserted into a working channel of an endoscope by its distal side.

2. The working channel instrument according to claim 1 , wherein

the actuator is configured such that it tensions at least one said tension wire guided in the working channel element between the inner circumference and the outer circumference and anchored at the bending portion, so as to control the bending of the bending portion.

3. The working channel instrument according to claim 2 , wherein

the proximal end of the control wire is anchored to the slider.

4. The working channel instrument according to claim 1 , wherein

the lock is positioned on the proximal side of the working channel element and is configured to fix a bent position of the bending portion.

5. The working channel instrument according to claim 1 , wherein

the working channel element comprises, on the proximal side, a mount by which the working channel element can be mounted to an endoscope.

6. An endoscope comprising the working channel instrument according to claim 1 .

7. A method for using a working channel in an endoscope, the method comprising:

temporarily inserting a separate working channel element is, with its distal side first, into a working channel of an endoscope, wherein:

the working channel element has a tubular shape which has an inner circumference and an outer circumference and through which an instrument can be pushed, and

the working channel element has a bending portion located on a distal side thereof;

controlling, via an actuator, the bending of the bending portion, the actuator including a hollow cylinder rod element having has a lateral slit extending in a longitudinal direction of the hollow cylinder rod element, wherein the actuator is located on a proximal side thereof;

sliding a slider arranged on the hollow cylinder rod element along on the hollow cylinder rod element in the longitudinal direction thereof;

bending the bending portion via a tension wire anchored on the slider;

guiding a lock located on the slider in the lateral slit of the hollow cylinder rod element; and

locking the lock in a selected longitudinal displacement position of the slider relative to the hollow cylinder rod element.

8. The method according to claim 7 , further comprising:

bending a distal end of the working channel element to the desired position.

9. The method according to claim 7 , further comprising:

after the working channel element has been used once, pulling the working channel element out of the endoscope and disposing of the working channel element.

10. The method according to claim 9 , wherein

the pulling of the working channel element out of the endoscope comprises pulling the working channel element out of the endoscope on the distal side of the endoscope.