Abstract
We developed a new transatrioseptal cannula for the left heart bypass which can be inserted safely and quickly by applicating modification of Seldinger technique. This cannula has a stylet in which 0.038 inch of guidewire is able to pass. In mongrel dogs weighing 15-20kg, 100-120ml/kg/min of flow volume could be obtained by using this 24 Fr. (ID=6mm) cannula in the left heart (left atrial-femoral artery) bypass. One day, three days and seven days after the insertion of this cannula in the left atrium, we pulled back this cannula to the right atrium. At that time, no meaningful interatrial shunt was detected. Moreover, the interatrial hole had been completely closed spontaneously one week after the decannulation in case of the three or less days' insertion. However, in case of the seven days' insertion, the hole had not been completely closed one week after the decannulation, but after two weeks it had been completely closed spontaneously.
