Belt with sensors

A stretchable belt for medical purposes for use on the body of a patient, the belt comprising:

• a sensor for detecting at least one parameter of the patient's body;
• stretchable belt material comprising a first material area occupying a first area of a belt material longitudinal extent in a belt longitudinal direction and a second material area occupying a second, different, area of said belt material longitudinal extent in the belt longitudinal direction, said first material area having a lower spring rate of longitudinal extension in the longitudinal direction than said second material area with a higher spring rate of longitudinal extension in the longitudinal direction, wherein the first material area with the lower spring rate is embodied with perforations and/or interruptions of the belt material with the lower spring rate attained by mechanically altering the structure of the belt material through perforations and/or interruptions in the first material area;
• and
• a blocking means to prevent stretching or allow stretching only slightly of the first material area with the lower spring rate.