A trocar 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 body comprising - at least one body which enters inside the body, - at least one thread which is located on the lower body and prevents the lower body from slipping inside the body or outside the body during operation, - at least one support which prevents the lower body from completely entering inside the body, - at least one upper body which is located at the upper part of the lower body and has the same or almost the same outer diameter with the lower body by means of using a simple valve system, - at least one valve which is located inside the upper body and prevents air leakage from the body cavity during surgery, - at least one air inlet-outlet channel which is located on the upper - body and enables the pressurized gas to be supplied inside the body or the gasses to be released from the body in order to maintain the body pressure, - at least one upper hole which enables the devices used during operation to be inserted into the upper body and is located at the end of the upper body on which the lower body is not located, - at least one lower hole which is located at the end of the lower body entering the body and enables the surgical instruments inserted inside the upper body via the upper hole and then moving through the lower body to go out of the lower body and move inside the body cavity, and - at least one drilling tip which is located at the end of the lower body entering the body and enables the lower body to be inserted into the body cavity by drilling the abdominal wall, and characterized by - an air inlet-outlet channel the end of which not connected to the upper body extends towards the lower body - at least one body which enters inside the body, - at least one thread which is located on the lower body and prevents the lower body from slipping inside the body or outside the body during operation, - at least one support which prevents the lower body from completely entering inside the body, - at least one upper body which is located at the upper part of the lower body and has the same or almost the same outer diameter with the lower body by means of using a simple valve system, - at least one valve which is located inside the upper body and prevents air leakage from the body cavity during surgery, - at least one air inlet-outlet channel which is located on the upper - body and enables the pressurized gas to be supplied inside the body or the gasses to be released from the body in order to maintain the body pressure, - at least one upper hole which enables the devices used during operation to be inserted into the upper body and is located at the end of the upper body on which the lower body is not located, - at least one lower hole which is located at the end of the lower body entering the body and enables the surgical instruments inserted inside the upper body via the upper hole and then moving through the lower body to go out of the lower body and move inside the body cavity, and - at least one drilling tip which is located at the end of the lower body entering the body and enables the lower body to be inserted into the body cavity by drilling the abdominal wall, and characterized by - an air inlet-outlet channel the end of which not connected to the upper body extends towards the lower body