| 摘要 |
Invention relates to a cannula and a screw pump for use in a mechanical circulatory support device, in particular a transventricular circulatory support device. The cannula according to the present invention comprises a tubular member made of a flexible, collapsible material having a diameter between 0.5 cm. and 3 cm., preferably between 1 cm and 2.5 cm. The invention also relates to an inflatable screw pump for use in circulatory support system which comprises a flexible central drive shaft and an inflatable body having a free edge defining a spiral shaped contour around the central drive shaft and an inner edge connected to the drive shaft. The Archimedes type screw pump may be used in conjunction with the flexible cannula. The method of connecting the circulatory assist device to the heart comprises the steps of: introducing the distal end of a cannula into a large systemic vein or into the right or left atrium, guiding the distal end of the cannula via the atrium to the inflow valve of the ventricle, and from there into the ventricle, guiding the distal end of the cannula from the ventricle to the ventricle outflow valve and from there into the pulmonary artery , the aorta or a side branch of the aorta and connecting the proximal end of the cannula to a pump. <IMAGE> |
