Surgeons and medical inventors who have been trying to perfect a mechanical substitute for the human heart, to be used while delicate surgery is performed on the heart itself, got a fillip of encouragement last week. Three doctors at Detroit's Harper Hospital reported in the A.M.A. Journal that they had used a mechanical substitute for the left side of a patient's heart and kept his circulation going this way for 50 minutes. The patient made a good recovery. If, as the three doctors believed, they had diverted the patient's entire blood flow, it was...
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