There are two people that you may be able to hold accountable for your pacemaker's failure. You might be able to sue the doctor who implanted it if their medical negligence resulted in an adverse event. You may also be able to sue the medical device manufacturer if their design, craftsmanship or marketing of the pacemaker was poor. Depending on the circumstances of your case, you may want to speak with a defective medical device lawyer or a medical malpractice lawyer.