A wearable external defibrillator is usually an option for all patients at risk for sudden cardiac arrest (SCA) for whom the very invasive surgery intervention to implant an internal defibrillator is not viable. The metallic paddles that convey the electrical discharge have to stay attached to the skin for effectiveness of the device, but such a solution presents several problems, i.e. lack of comfort, difficulties in usage for overweight people, skin rash and burns, itching, sleep disturbances. Moreover, the vest be removed to shower or bathe. As a result, many patients stop using it, putting themselves at a very high risk. Such a system presents a lot of issues and contradictions and an effective use of TRIZ methodology could be very helpful to identify the needed improvement actions. The present paper will show a case study model developed for the first TRIZ Barcamp, with strong focus on the modelling peculiarities required by a very short session, the ideas generated by the participants and the learnt lessons.