Abstract: The medical instrument is equipped with a handle and has a shank for supplying and removing rinsing fluid into or out of a hollow cavity inside the body. There are tubings which can be releasably inserted onto connection pieces connected to the shank and which can be fixed on the connection pieces. The handle is formed as a two-part housing, wherein for opening and closing the housing a first housing part is adjustable relative to a second housing part so that with an opened housing the tubings can be pushed or pulled from then freely situated connection pieces and with a closed housing the tubing ends located on the connection pieces are fixed onto the connection pieces with a friction fit by way of the first housing part.