Abstract
Stimulated by the work of Halsted and Matas, I and my assistants recently undertook some experiments with the object of working out a method for the gradual automatic occlusion of the larger blood-vessels at one operation. Halsted used aluminum bands on the arteries for the purpose of permanently occluding their lumina, completely or in part, while Matas employed them for testing the efficiency of the collateral circulation. In neither of these methods, however, nor in any other that we know of, is there any definite and well-directed attempt to bring about gradual automatic occlusion in one operation, the thing above all others needed in arterial surgery for the treatment of aneurysm and tumors involving the great vessels. It was for the purpose of establishing a principle. which might be at least a step toward the solution of this problem, that we devised the clamp described below. In the larger number

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