Abstract: In order to solve the problem of poor efficacy and poor experience of using the current clinical burn scar treatment instrument, this article analyzes the treatment needs based on the environment-based design (EBD) methodology and establishes an iterative object model for a burn scar treatment instrument. Through core conflicts identification, targeted programs were generated for the main contradictions, and the mechanism of piercing freezing was explored. In addition, this article designed a front-end freezer gun and universal liquid nitrogen temperature-controlled cooling device that can adjust the piercing array in real time according to the shape of the scar and achieve constant low temperature control within the required accuracy. Simulation results and animal experiments show that environmental design theory has feasibility in product innovation design in biomedical engineering.

Key words: environment-based design methodology, burn scar, piercing cryotherapy, innovative design