A medical instrument having an elongated shaft, with an elongated outer tube, a first transmission element including a first and second half tube, mutually displaceable in a longitudinal direction in order to operate one first functional element, wherein a second transmission element is in a cavity formed by the first and second half tube. A shaft housing connected to the outer tube is arranged in a proximal end portion of the shaft, and a first hollow tube which is connected to the first half tube is arranged within the shaft housing, and a second hollow tube connected to the second half tube within the first hollow tube, with substantially annular first and second seals. The first and second half tube extend through the shaft housing, a seal is arranged between an inner surface of the shaft housing and the outer surfaces of the first and second half tube.
