LifeVest Wearable Defibrillator Model 4000, Product Number 10A0988-A01. The LifeVest system is indicated for patients 18 years of age and older who are at risk for sudden cardiac arrest and are not candidates for or refuse an implantable defibrillator. Class I - Dangerous Incorrect service code for properly catching critical defects during self-check. Potential for defibrillation shock failure Sep 12, 2017 Implants & Prosthetics Nationwide View Details →