Medical instrument for endoscopic interventions

1. A medical instrument for endoscopic interventions having a hollow shaft for receiving at least one medical instrument and having a handle that supports the shaft, which handle contains at least one channel that continues in the hollow shaft, and which handle can be dissolubly secured on the shaft by means of a coupling mechanism, the at least one channel is configured as a flushing and/or suction channel, and, in the area of a coupling spot between the at least one handle-side channel and the hollow shaft, a projecting part and a corresponding recess for inserting the projecting part are configured on the shaft and on the handle, and configured between the at least one handle-side channel and the hollow shaft, there is at least one insulating element via which each projecting part and the respective corresponding recess are connected to each other in a pressure-tight manner, distinguished in that the coupling mechanism is configured as a notching connection with two spring-loaded valve rockers mounted on the shaft, and centering aids for joining the handle and the shaft together in an exact position are formed on the handle and/or on the shaft which centering aids are configured as pins that can be inserted into corresponding recesses on the other respective component to be coupled with, and the length of the pins is such that they already secure the shaft and the handle relatively to one another before shaft and handle are coupled to one another via the coupling mechanism.

2. A medical instrument according to claim 1 , wherein the at least one channel is configured as a light channel provided with light-conducting fibers, distinguished in that a separate channel is positioned in the hollow shaft to receive the light-conducting fibers, and that the light-conducting fibers of a handle-side light channel and of a shaft-side light channel are ground and polished on their mutually facing end surfaces.

3. A medical instrument according to claim 2 , distinguished in that in a coupled position the mutually facing end surfaces of the light-conducting fibers of the handle-side light channel and of the shaft-side light channel are aligned centrally on one another.

4. A medical instrument according to claim 2 , distinguished in that in the area of a coupling spot between the handle-side light channel and the shaft-side light channel an optically active substance such as an optical gel can be applied on the ends of the light-conducting fibers.

5. A medical instrument according to claim 2 , distinguished in that a light-conducting cluster in the handle-side or shaft-side light channel has a greater diameter than the light-conducting cluster in the respective shaft-side or handle-side light-conducting channel to be coupled with.

6. A medical instrument according to claim 1 , distinguished in that in the handle two separate channels are configured that serve as flushing and suction channel.

7. A medical instrument according to claim 2 , distinguished in that in the handle three channels are configured, namely a light channel, a flushing channel, and suction channel.

8. A medical instrument according to claim 1 , distinguished in that the notching connection can be released by means of an unlocking mechanism.

9. A medical instrument according to claim 8 , distinguished in that the un-locking mechanism is configured as a valve rocker mechanism that is in active connection with the notching connection.

10. A medical instrument according to claim 1 , distinguished in that the at least one insulating element is configured as an O-ring.