Measurement device (4, 17, 24, 45, 52, 78) for measuring a tension and/ or a displacement of a compression material (37, 54, 79) of a compression device (42, 63) or a force and/or a displacement associated with the compression device (42, 63) applied to a patient, characterized in that the measurement device (4, 17, 24, 45, 52, 78) comprises at least one first and at least one second magnetic element (1, 1a, 1b, 1c, 1d, 2, 18, 19, 20, 21, 29, 30a, 30b, 35, 36, 58, 59, 60, 61, 82. 83), wherein the first and the second magnetic elements (1, 1a, 1b, 1c, 1d, 2, 18, 19, 20, 21, 29, 30a, 30b, 35, 36, 58, 59, 60, 61, 82. 83) are relatively displaceable such that the tension and/or force is measurable depending on a relative displacement of the first and second magnetic elements (1, 1a, 1b, 1c, 1d, 2, 18, 19, 20, 21, 29, 30a, 30b, 35, 36, 58, 59, 60, 61, 82. 83) based on a tension and/or force overcoming a magnetic interaction force between the first and second magnetic elements (1, 1a, 1b, 1c, 1d, 2, 18, 19, 20, 21, 29, 30a, 30b, 35, 36, 58, 59, 60, 61, 82. 83).
