Since pressure ulcers remain a major health issue in individuals with spinal cord injuries, a new medical device is being developed. Based on the principle of sensory substitution, it aims at compensating the sensory deprivation in the buttock area by the tactile sensory modality in the tongue area. This paper concisely describes the last homemade medical device and reports the first methodological steps of a sustainability study: an open pilot prospective clinical study in 10 healthy seated subjects with 92% success in 100 performed tests; a current open randomized prospective controlled clinical trial with the methodology used