The portal access device which it tries to be able to access long term in the port which is transplanted to the patient has two principal constitution parts of the injector assembly, and the safe needle insertion device. As for the injector assembly form of specification, it possesses the injector housing which for example can make structure of dome condition. Ahead the cannula is installed sluggishly underneath the injector housing, from underneath the injector housing has extended to the lower part. In addition, tube organization, or the catheter in the injector housing, is connected to the side section to ideal. The based basic end of the safe needle insertion vessel assembly is formed to the form which it can conform on the injector housing. The upright body is provided in the based end mount, the needle or the acute cannula is connected to the 1st edge of the arm, the 2nd edge of the arm movement possibly the hinge is connected to the base. The acute cannula extends from underneath the basic end of the arm, passing the hole which was formed to the based basic end, penetrates the base. This hole is demarcated with opening underneath the base and opening of the based surface. In the based upright body and the end mount of the arm, lock mechanism is provided, the occasion where the arm was moved in order to leave from the base, and the end mount of the arm the occasion where the time it makes move around the upright body, also the arm, and the respective lock mechanism which is provided in the base working doing, lock the arm in specified position, maintain the point of the needle in the borehole which because of this was formed to the base. In order to use, the safe needle insertion vessel is installed on the injector assembly, the acute cannula is penetrated to the injector housing, the acute cannula ahead the injector assembly is made to connect to axis direction sluggishly in the cannula, but ahead exceeding the point of the cannula sluggishly, it extends the
