The importance of respiratory therapy equipment in the medical field is self-evident. The superiority of its performance is undoubtedly related to the therapeutic experience and even the degree of recovery of customers. Patients need a good physical therapy environment for rehabilitation therapy or medical treatment. If the smoothness of the control operation of physical therapy equipment is affected or the selection of bearing materials causes secondary interference to the patient's respiratory system, it may affect the patient's rehabilitation process and even endanger the patient's life. Therefore, the selection of medical device bearings is particularly important.