The present invention provides a catheter for extraction that can efficiently extract blood flowing in coronary sinus from coronary artery through coronary vein and has the same operability as catheters used in conventional PCI. The present invention also provides a catheter for extracorporeal circulation that can lessen an introduction number of devices for blood access as little as possible and reduce further the burden to a patient, in addition to the same operability as the catheters used in the conventional PCI. The catheter for extraction is equipped with blood extracting lumen in an inside and equipped with a hub at a proximal end portion, and when a minimum sectional area to a circumferential direction of the blood extracting lumen is referred to as S1 and immersion side length is referred to as L 1 , an equivalent diameter D 1 satisfies the formula defined by D 1 =(4×S 1 )/L 1 and the equivalent diameter D 1 is at 1.80 mm. The catheter for extracorporeal circulation also has blood extracting lumen extending from the distal end to the proximal end and blood return lumen extending from the proximal end of the catheter to a fixed length distal end.
1. A method of actuating a catheter for extracorporeal circulation, wherein the catheter has distal end and proximal end, the catheter has blood extracting lumen extending from the distal end to the proximal end and blood return lumen extending from the proximal end of the catheter to the fixed length distal end, the blood is extracted from the distal end of the blood extracting lumen arranged in the coronary sinus of patient's heart and the blood is returned from the blood extracting lumen arranged in the body of a patient into the body of the patient.
2. The method of claim 1 , further equipped with that when the minimum sectional area to the circumferential direction of the blood extracting lumen of the catheter for extracorporeal circulation is referred to as S 1 and an immersion side length is referred to as L 1 , an equivalent diameter D 1 satisfies the formula defined by D 1 =(4×S 1 )/L 1 and the equivalent diameter D 1 is at least 1.80 mm, and when the minimum sectional area to the circumferential direction of the blood return lumen is referred to as S 2 and the immersion side length is referred to as L 2 , an equivalent diameter D 2 satisfies the formula defined by D 2 =(4×S 2 )/L 2 and the equivalent diameter D 2 is at least 1.30 mm and at most 2.00 mm.