A medical device for causing hemostasis of a blood vessel for use through an endoscope, said medical device comprising: a handle; a sheath device, which is attached to the handle; a clamp device including a clamp base, in particular in the form of a sleeve, provided on a distal end of the sheath device and at least two clamp arms (7a, 7b), in particular exactly two clamp arms; a control wire extending through the sheath device and reversibly movable in distal and proximal directions; and an actuator coupled to a proximal end of the control wire and actuable to reversibly move the control wire in the distal and proximal directions; wherein the clamp arms (7a, 7b) are each coupled to a distal end of the control wire and wherein the clamp device is actuable to open and close the clamp arms by a movement of the control wire such that a movement of the control wire in the proximal direction is translated into a closing movement of the clamp arms (7a, 7b) and a movement of the control wire in the distal direction is translated to an opening movement of the clamp arms (7a, 7b); wherein the clamp arms (7a, 7b) are coupled to the control wire by means of a pivot pin which is provided at a distal end section of the control wire and extends through corresponding through-holes provided in proximal end sections of the clamp arms (7a, 7b), characterized in that exit-passages are provided in tail ends of the clamp arms (7a, 7b), through which, after closing the clamp arms (7a, 7b), the pivot pin can be pulled out of engagement from the through-holes and from the clamp arms spreading apart tail end sections (15, 16) of the clamp arms (7a, 7b) on opposite sides of the exit-passages without breaking them by a proximal movement of the control wire in order to uncouple the control wire from the clamp arms. a handle; a sheath device, which is attached to the handle; a clamp device including a clamp base, in particular in the form of a sleeve, provided on a distal end of the sheath device and at least two clamp arms (7a, 7b), in particular exactly two clamp arms; a control wire extending through the sheath device and reversibly movable in distal and proximal directions; and an actuator coupled to a proximal end of the control wire and actuable to reversibly move the control wire in the distal and proximal directions; wherein the clamp arms (7a, 7b) are each coupled to a distal end of the control wire and wherein the clamp device is actuable to open and close the clamp arms by a movement of the control wire such that a movement of the control wire in the proximal direction is translated into a closing movement of the clamp arms (7a, 7b) and a movement of the control wire in the distal direction is translated to an opening movement of the clamp arms (7a, 7b); wherein the clamp arms (7a, 7b) are coupled to the control wire by means of a pivot pin which is provided at a distal end section of the control wire and extends through corresponding through-holes provided in proximal end sections of the clamp arms (7a, 7b), characterized in that exit-passages are provided in tail ends of the clamp arms (7a, 7b), through which, after closing the clamp arms (7a, 7b), the pivot pin can be pulled out of engagement from the through-holes and from the clamp arms spreading apart tail end sections (15, 16) of the clamp arms (7a, 7b) on opposite sides of the exit-passages without breaking them by a proximal movement of the control wire in order to uncouple the control wire from the clamp arms.