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Alfred Blalock, an American surgeon.

Blalock anastomosis
a technique for repair of tetralogy of Fallot in which there is an end-to-side anastomosis of the subclavian and pulmonary arteries.
Blalock ligation
a technique for placement of a ligature around the aorta to isolate the ductus arteriosus in the surgical repair of patent ductus arteriosus.