抄録
The object of this study was to develop technology for a valve to be mounted in a disposable medical device and obtain highly robust technical information before the product planning stage. The valve had two opposing functions: to limit the amount of blood flowing backward into a needle when the needle is inserted into a blood vessel; and when medicine is administered, to allow the prescribed amount to flow forward without resistance into the subject’s body. The basic function of the valve was defined in terms of input and output, the input being fluid pressure （blood pressure or medicine pressure），the output being the differential pressure on the two sides of the valve. Experiments were performed after assignment of noise factors. To increase the efficiency and reduce the cost of the experiments, they were carried out on a scaled-up version of the contemplated product. The two opposing functions were optimized simultaneously by finding their mutual S/N ratio. The valve was thereby developed in one-fourth the time spent on previous valves, and at one-fourth the cost.
https://ror.org/02kbe5v55 
