The invention relates to a medical treatment device having a hose set (20) and a peristaltic hose pump (6) for conveying fluid, and having a monitoring device (15) for monitoring the occlusion of the displacer (13A, 13B) of the hose pump. The invention further relates to a hose set (20) for a medical treatment device and to a method for monitoring the occlusion of the occlusion element of a peristaltic hose pump for conveying a fluid for a medical treatment device. The invention is based on the occlusion of the displacer (13A, 13B) of the peristaltic hose pump (6) being monitored in order to monitor the fluid flow in the hose line (5). In order to do so, the electrical resistance or a parameter correlating with the electrical resistance is measured between a first and a second electrode (16A, 16B), wherein the first electrode (16A) is arranged on the hose line (5), upstream of the occlusion element (12) of the peristaltic pump (6), and the second electrode (16b) is arranged on the hose line (5), downstream of the occlusion element, such that an electrical contact between the first and second electrode (16A, 16B) and the fluid flowing in the hose line (5) is produced. The electrodes (16A, 16B) are preferably an integral component of a connector (10), by means of which the hose segment (5A) to be inserted into the hose pump (6) is fixed in the form of a loop.
