This paper explores the different methods for introducing psychoanalytic knowledge into the modern institutional care system, with focus on the CAPS Network substitutive services in Mental Health. It seeks to define and evaluate the origns and evolution of these practices and facilities that aim to implament the proposed Psychiatric Reform in Brazil. Some of the fundamental aspects and social dynamics of clinical assistance and mental health care are established in order to better define the challenges of extended clinic in this context. This research considers clinical trials undertaken by professionals in Brazil to develop a model of group psychotherapy able to address the needs and requirements inherent in the current institutional public health system, while meeting clinical demands and providing individual treatment plans for the users/patients. The modern development of group techniques in psychoanalysis is discussed. In addition, group therapy - as a clinical and technical device capable of delivering positive results - is supported both in terms of the social rehabilitation of patients, as well as in the the subjective clinic.