There's no buyer's remorse at St. Jude Medical (NYSE:STJ) when it comes to the company's $455 million acquisition of CardioMEMS.St. Jude CEO Dan Starks yesterday called CardioMEMS Champion HF implantable heart monitor the company's "single most important new growth driver" and predicted the market for the product would exceed $1 billion.Sign up to get our free newsletters delivered straight...