As a method of operating a nurse call system for patients with cervical spinal cord injury, we have developed a simple method that does not require adjustment for each care, as positioning is difficult with conventional devices that use finger movements and exhalation. This is the voice input device for nurse calls that can be attached and detached without changing the conventional nurse call. We have also developed a simple angle measuring device to prevent aspiration.

In the manufacturing process, even if the mounting method requested by the medical institution was created as it is, many problems occurred when actually using it, and improvements had to be made.

In addition, although the functions met the requests (specifications), many unexpected problems occurred, and improvements were made repeatedly. For these reasons, in medicine-engineering collaboration, it is first necessary to have an actual product that embodies the idea. Based on the actual product, various problems such as additional functions and hidden needs will be clarified by discussing them. Therefore, first of all, it is necessary to actually commercialize the design specifications in order to quantify them in a short time. I learned that this is necessary and important for medical-engineering collaborative manufacturing.

Also, if it is difficult to evaluate the results of improvement, it will be difficult to keep students motivated as the repetition of improvement seems endless. In particular, if the discussion between the hospital side and the engineering side becomes heated in the development of the device, the priority shifts from the convenience of the patient to the convenience of the hospital staff.

Therefore, it became clear that it is important to evaluate the effect quantitatively of the product, rather than setting the goal as manufacturing. For that purpose, it became clear that close cooperation and the final goal (quantitative evaluation criteria) among the coordinators of medicine and engineer of the production side, and the staff in the medical field are indispensable. In this paper, we consider and discuss these issues in medical-engineering collaboration and their solutions.