a ban on trans fats, a dramatic reduction in sugar and fat consumption, eliminating heavily processed foods from your diet, no smoking and regular exercise will do more to reduce heart attack than any surgical approaches. Of all of these the most important is the regular exercise followed closely by stopping smoking.
Sadly the general belief is that any amount of abuse can be undone with a pill or a procedure, and it's not until it's too late that we realise this isn't true.
There can be many remedies for heart-attacks and detection and first aid are among the best measures to save life. If during initial phase of heart attack the device can give shock to heart so that patient can buy some precious time then this in itselft is good enough innovation.