| 摘要 |
PROBLEM TO BE SOLVED: To provide a catheter which can perform plural kinds of medical treatments such as transfusions simultaneously and reduces a burden on a patient.SOLUTION: A catheter related to one aspect of this invention includes: a blood return lumen which is arranged in a first region and communicates with the outside via an opening part provided in a distal end part; a blood removal lumen which is arranged in a second region and communicates with the outside via a semicircular opening part arranged on a proximal end part side with respect to the opening part of the blood return lumen; three or more transfusion lumens arranged in the first region; and a narrow diameter part which is provided from the opening part of the blood removal lumen to the distal end part, has the blood return lumen and three or more transfusion lumens in the inside, and has a taper so that a diameter is reduced gradually toward the distal end part. Then, a cross section of the blood return lumen is formed to be bigger than cross sections of the respective transfusion lumens. The opening part of the blood removal lumen is slanted to the proximal end part side in an axial direction. The respective opening parts of the transfusion lumens are arranged in the narrow diameter part and are formed to follow the taper of the narrow diameter part.SELECTED DRAWING: Figure 1 |
