The present invention relates to a trocar, more particularly to a trocar head and valve which isolates the internal body cavity from external environment while a laparoscopic instrument is inserted into the body cavity through the trocar as well as while no laparoscopic instrument is inserted through the trocar. A trocar (1), which is used in various laparoscopic and other minimal invasive surgeries and through which the instruments and/or devices to be used during operation and/or surgery are passed and are inserted inside the patients body, comprises at least one trocar body (2) at least a part of which enters inside the patients body, at least one monolithic head (3) consisting of, an outer surface (35) at least a part of which has an increased frictional coefficient to prevent slipping and enabling better gripping, an inner surface (36) with reduced frictional coefficient to enhance slipping ability of medical instrument inside the head (3), at least one passageway (31) for receiving medical instrument, at least one diaphragm seal (32) monolithically formed inside the head (3) isolating interior of the patients body from exterior while no medical instrument is introduced, at least one subsidiary seal (33) monolithically formed inside the head (3) forming a seal around the medical instrument.La présente invention concerne un trocart, plus particulièrement une tête de trocart et une valve qui isole la cavité de corps interne dun environnement externe tandis quun instrument laparoscopique est introduit dans la cavité de corps à travers le trocart, et tandis quaucun instrument laparoscopique nest introduit à travers le trocart. Un trocart (1), qui est utilisé dans diverses chirurgies laparoscopiques et autres chirurgies minimalement invasives, et à travers lequel les instruments et/ou dispositifs à utiliser pendant une opération et/ou une chirurgie sont passés et sont introduits à lintérieur du corps du patient, comprend au moins un corps de trocart (2) dont au moin
