When sourcing portable medical devices, the most critical factor is ensuring the supplier holds ISO 13485 certification, which governs quality management systems for medical devices. Depending on your target market, products must have CE Marking (MDR 2017/745) for Europe or FDA 510(k) clearance for the United States. Additionally, ensure the device complies with IEC 60601-1 (electrical safety) and IEC 60601-1-11 (requirements for medical electrical equipment used in the home healthcare environment).