Medical instrument (10) for endoscopic surgery, which has a tubular stem (12) with a distal end and a proximal end and a connecting body (14) arranged in the area of the proximal end of the tubular stem (12), being axially traversed the tubular rod (12) and the connecting body (14) through a common channel (50) to give way to an elongated actuating element (42), an end body (16) attachable to the connecting body (14) and provided of a handle (54) fixed thereto to handle the medical instrument (10), and a locking slide (18) that is movably mounted in a conduit (22) oriented at an angle to the channel (50) and disposed within of the connecting body (14), the locking slide (18) of the connecting body (14) protruding with an actuation zone (20) and said slide can be operated by finger pressure on the actuation zone (20) to a interlocking position and a release position, of such that the end body (16) coupled to the joint body (14) is locked in the locked position against the joint body (14) by means of a shape conjunction adjustment, and said end body can be separated from the body of connection (14) in the release position, and the locking slide (18) being retained in the locked position with the elastic force of an elastic element (24), characterized in that the elastic element (24) is arranged in the conduit (22) between the actuation zone (20) and the channel (50), the elastic element (24) being configured as a conical-shaped helical spring whose narrowed end is supported on a shock surface (58) arranged by under the drive zone (20) of the locking slide (18) and whose wide end is supported on a support surface (56) in the channel area (20).Instrumento médico (10) para cirugía endoscópica, que presenta un vástago tubular (12) con un extremo distal y un extremo proximal y un cuerpo de unión (14) dispuesto en la zona del extremo proximal del vástago tubular (12), estando atravesados axialmente el vástago tubular (12) y el cuerpo de unión (14) por un canal común (50) pa
