In order to remedy the shortcomings revealed during the in-vitro tests of pharmacological agents release using a peristaltic simulator, a new type of contractor for performing circular contractions has been developed. The constriction mechanism allows a compression force of 12 N and an aperture size of 10-45 mm. In the context of this master's thesis, we designed and developed a new aperture mechanism based on the given requirements and specifications. Furthermore, we prototyped the new concept and based on the calculations and model improvements, made a test version of the contractor. We also designed a test device with which we tested the assembled constriction mechanism to verify that it works properly and allows to squeeze a flexible bag with the required force of at least 1 N in all operating conditions. Based on the successful performance checks, 16 identical contraction mechanisms were built and incorporated into an improved version of the new peristaltic simulator with increased capacity.
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