<qa>  What is the name of the pilot study that will include more than 20 patients with severe hemophilWith Rare Diseases Foundation support, the investigators have initiated this pilot study that will include more than 20 patients with severe hemophilia or constitutional bleeding disorder, who benefit from the device. This descriptive, monocentric, interventional study will permit to describe the psychological status, the quality of life of patients and their parents, but also to evaluate the impact of the device on initiation and observance of treatments like Long Term Prophylaxis. 