ABSTRACT
The application of TRIZ in design should determine problems and contradictions. The contradictions should be determined as the physical contradiction or a technical contradiction. The technical contradiction means: when the parameter is improved, the other parameter will become worse. For example, the vehicle horsepower and gas consumption; physical contradiction means: the same parameter has the two conflicting properties such as being light and being heavy. For technical contradiction, 39 engineering parameters and 40 invention principles are applied to solve the problem. For physical contradiction, extraction is applied to solve the problem. The technical contradiction is the conflict of two parameters. The two-dimensional matrix represented by 39×39 engineering parameters displays the possible conflict: the vertical axis represents the parameter to be improved and the horizontal axis represents the parameter that will become worse. The matrix elements are the suggested innovative rules for the condition, consisting of 40 invention principles [12]. This study applies technical contradiction in the analysis of the design of a safety device for intravenous infusion tubing to get two solutions as illustrated below.
