As for the blood vessel access device, the gas chamber which supplies with the substance and the partition and, and, it should have included with the receptacle which is communicated with the gas chamber. As for the method of making the gas inside the medical application device move, the fact that the gas is made to move with the gas chamber of the blood vessel access device and the receptacle which supplies inside the said blood vessel access device should have been included.血管アクセスデバイスは、本体と隔壁との間に収められたガスチャンバーと、そして、ガスチャンバーと連通するレセプタクルとを含むとよい。医療用デバイス内のガスを移動させる方法は、血管アクセスデバイスのガスチャンバーと該血管アクセスデバイス内に収められたレセプタクルとの間でガスを移動させることを含むとよい。