The present invention relates to a trocar which is used for laparoscopic surgery by an operation hole without opening a body of a patient and, more specifically, the trocar which has: an improved structure of a sealing tube in the trocar to prevent a discharge of gas charged in a stomach of the patient by being opened while inserting a surgical tool for laparoscopic surgery and closed while withdrawing the surgical tool for laparoscopic surgery removes foreign materials or contaminants such as blood of a tissue of the human body on the surgical tool which is inserted and withdrawn through trocar and has a filter for the foreign materials especially to clean a foggy lens in a tip of an endoscopic camera due to temperature difference between an operating site and an outside of the operating site. The tracoar comprises: a sealing tube, as a tube made of a flexible material which is fixed by being inserted between a head part of a main body of the trocar (30) and an intubation part (31), which has a recovery force to rapidly recover while withdrawing the surgical tool (1) and a pressing force for grasping the surgical tool (1) in at least 2 to 3 cut-out portions from a front end outer surface wherein a cut-out portion (11a) is located to a closing direction of the cut-out portion (11a) a foreign substance filter (20), as a tube made of a flexible material fixed in a middle part of the head part of the main body of the trocar (30), which collects the foreign substance on the surface by squeezing the surface of the surgical tool (1) which is inserted or withdrawn.본 발명은 환자의 배를 개복하지 아니하고 구멍을 내어 복강경 수술을 하는데 사용되는 트로카에 관한 것으로, 더욱 상세하게는 복강경 수술도구의 인입시 오픈(Open)되고 복강경 수술도구의 인출시 차단(Close)되면서 복부에 충진시킨 가스의 유출을 방지하는 트로카용 실링튜브의 구조를 개선시키고, 트로카를 통해 인입 인출되는 수술도구에 묻은 이물질 내지는 오염물(신체 조직 혈액 등의 오염물질)을 제거하는 한편, 수술도구 중 특히 내시경 카메라의 팁(렌즈) 부분이 온도차(수술부위와 수술부위 밖의 온도차)에 의해 뿌옇게 된 것을 클리닝 시키는 이물질필터를 탑재하여서 된 트로카에 관한 것이다. 본 발명은 트로카본체(30)의 헤드 부분과 삽관부(31) 사이에 인서트 고정되는 플렉시블한 재질의 튜브로서, 절결부위(11a)가 위치한 선단 외부면에서,
