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

Inclusion Criteria: * Children from 6 to 16 years old suffering from leukemia requiring needle insertion into an implantable port and having a life expectancy greater than or equal to 3 months * Subjects and their parents who have been informed of the study and having expressed their informed consent * Children without contraindications to the use of MEOPA® : * Patient requiring 100% oxygen ventilation * Intracranial hypertension * Any alteration in the state of consciousness preventing the patient\'s cooperation * Children without contraindication to the use of the virtual reality mask: * Epilepsy * Psychiatric illness * Children and parents able to use the self-assessment scales proposed in the study * Enrolment in the Social Security system Exclusion Criteria: Children from 6 to 16: * Having a modification of pain\'s integration (spina bifida for example) * Requiring contact isolation (conjunctivitis, contagious skin condition, etc.) * With a history of seizures