HeartSine Samaritan Paediatric-Pak - Cartridge The HeartSine Samaritan Paediatric-Pak cartridge features a 4 year shelf life and can be easily identified against the standard adult cartridge with its difference in colour and shape. • For the HeartSine Samaritan PAD 350P, 360P and 500P defibrillators • Electrode Pad Lifespan: 4 years