PROBLEM TO BE SOLVED: To provide a mixing device, mixing tube, medical fluid injection system, and medical fluid mixing method, by which a plurality of kinds of medical fluids can be uniformly and efficiently mixed with a desired concentration at the time of injection and by which even a small amount of medical fluids can be mixed with a high mixing efficiency.SOLUTION: The mixing device of the present invention includes: a swirl flow forming chamber for forming a swirl flow a first inflow port for guiding a first medical fluid into the swirl flow forming chamber in a direction parallel to the center axis of the swirl flow a second inflow port for guiding a second medical fluid into the swirl flow forming chamber so that the swirl flow of the second medical fluid having a smaller specific gravity than that of the first medical fluid is formed in the swirl flow forming chamber an outflow port from which the mixed medical fluid of the first and the second medical fluids flows out and a constriction chamber which is installed between the swirl flow forming chamber and the outflow port and which has a space continuously constricted toward the outflow port.COPYRIGHT: (C)2016,JPO&INPIT【課題】注入時において複数種類の薬液を所望する濃度で均一に効率よく混合でき、少量の薬液であっても高い混合効率で混合できるミキシングデバイス、ミキシングチューブ、薬液注入システム及び薬液の混合方法を提供する。【解決手段】 本発明に係るミキシングデバイスは、旋回流を生成するための旋回流生成室と、上記旋回流の中心軸と平行な方向で第1薬液を上記旋回流生成室に導入するための第1流入口と、上記第1薬液の比重より小さい比重を有する第2薬液の旋回流が上記旋回流生成室において生成されるように、上記第2薬液を上記旋回流生成室に導入するための第2流入口と、上記第1薬液と上記第2薬液との混合薬液が流出する流出口と、上記旋回流生成室と上記流出口との間に設けられ、上記流出口に向かって連続的に狭窄している空間を有する狭窄室とを備える。【選択図】図5
