Evaluation of the Efficacy of a Virtual Reality When Placing a Needle on an Implantable Venous Access Device in Children With Leukemia

Main objective: Evaluate the effectiveness of the repeated use of interactive or hypnotic virtual reality compared to standard treatment, on pain, during each needle placement on PAC for 3 months on children or adolescents (6 to 16 years old) with acute leukemia Hypothesis: Repeated use over 3 months of hypnotic or interactive virtual reality provides more benefits in terms of : * pain management * anxiety of the child and his parents * satisfaction of the child's care, of his parents and of the caregivers compared to the standard method when inserting a needle into an implantable port in the pediatric oncology department or day hospital.