By Jonathan Stempel NEW YORK (Reuters) -A federal appeals court on Monday rejected Pfizer Inc’s challenge to a U.S. anti-kickback law the drugmaker said prevented it from helping heart failure patients, many with low incomes, afford medicine that cost $225,000 per year. A unanimous three-judge panel of the New York-based 2nd U.S. Circuit Court of Appeals rejected Pfizer’s effort to directly cover co-pays for patients taking its Vyndaqel and Vyndamax drugs. The court agreed with a lower-court judge that Pfizer’s Direct Copay Assistance Program violated a ban on “knowingly or willfully” providin…