A subcutaneous internal cardioverter-defibrillator developed by Boston Scientific has brought new hope for Ruben Rivera, a 62-year-old patient with a weak heart, and Leonardo Perez, a 50-year-old patient who underwent triple bypass surgery last year. Rivera and Perez were implanted with the battery-powered device recently at separate hospitals in Texas. Since receiving the device, Rivera said he has no regrets. "I know that if I go into cardiac arrest, this apparatus will take care of my needs," he said. Meanwhile, Perez said he felt fortunate to receive the device, which can shock his heart back into normal rhythm if he needs it.