Current practice in Singapore Emergency Ambulance Service (EAS) includes the use of analgesia delivered via inhalation Enthanox (Nitrous Oxide). However there are difficulties administering Enthanox on-scene due to the added weight of carrying bulky cylinder tanks. It is common for a delay in administration of analgesia. In addition, there are problems with storage, leakage, maintenance and occupational exposure of the EAS crew members. Therefore, there is a need for better standard of care treatment.