A defective aortic valve removed from a cadaver was installed on a testing unit imitating systemic circulation. The defect (insufficiency of the valve) was corrected by means of valvular devices consisting of a thin elastic membrane which was flat and round in one case and shaped like a spherical vault in the other; the devices were fastened on the distal end of a catheter. The authors present the values of pressure in the heart, aorta and coronary arteries and the minute circulation volume before and after correction of the defect. It is concluded that the suggested valvular devices are efficient and further study is expedient.
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