Abstract: The present invention relates to the field of prosthetics having the function of restoring swallowing, breathing and phonation to a patient having a dysfunctional larynx. More specifically, the present invention concerns a valve device forming an intra-laryngeal endoprosthesis intended for implanting in the anatomical larynx in place having the function of enabling breathing while forming a seal against elements such as saliva, mucus or any other element coming from the bolus. The complete intra-laryngeal endoprosthesis, as well as its various applications, are also the subject matter of the present invention.