Medicine: Hydraulic Heart

When a San Diego physician asked a technician at General Dynamics' Convair Division to sharpen a big and costly type of hypodermic needle, he had no idea that the trail would lead into the human heart. But more Convair design specialists and engineers got interested in medical gadgeteering; *last week a notable result was announced. They had developed a new and sophisticated heart-lung machine.

Machines to bypass the heart and lungs during operations inside the heart vary widely because surgeons have pet preferences about details. Biggest difference is in how the blood is oxygenated: some machines bubble the oxygen through the blood,...

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