"Clinical Ultrasound, a New Link Between Town and Hospital in Seine-Saint-Denis". (ECHO93)

This research will be carried out in 3 phases: * Phase 1: implementation of the tool within the hospital for UDR doctors and evaluation of the effect of this implementation on the organizations: shorter time to diagnosis, increased accuracy of diagnosis, reduced number of complementary examinations. This first phase will begin with EchOpen training for doctors, and will continue with inclusions and testing of the added value of using the probe within the UDR. * Phase 2: implementation of the tool in the structures referring patients to the UDR, whether the SAU de Jean Verdier, for clearing before referral to the UDR, or the structures of town doctors (CPTS Livry Gargan, MSP Pantin and Cabinet Médical du Dr TAYBALY at Aulnay-sous-Bois) for clearing before referral to the UDR. As in phase 1, the aim is to assess the effect of the new approach on organization, and to report on follow-up indicators, such as the number of patients with direct access to biopsy, the reduction in diagnosis time, and the targeting and reduction of additional examinations. This second phase will begin one month after phase 1, starting with EchOpen training for doctors and continuing with inclusions and experimentation within the adult emergency departments of Jean Verdier Hospital and the multi-professional health centers named above. * Phase 3: implementation of the tool in the Health Bus, as part of the "go-to" approach. The monitoring indicator will be the number of situations in which the echOpen solution has made it possible to sort between pathologies that require an emergency service or that can be managed in the Health Bus. This third phase will begin one month after phase 2, starting with EchOpen training for doctors and continuing with inclusions and testing of the probe in the Health Bus.