Long before the invention of syringe, doctors had implemented infusion treatment methods, but because of tbeing exposed in nature, patients always got infected. It is generally believed that the originator of the syringe for medical treatment was Scottish doctor Alexander Wood and French Charles Praphas, who worked together in 1853 to achieve this process. Alexander used the new tool to inject morphine subcutaneously into patients to treat sleep disorders. However, unfortunately, Alexander's wife died of an morphine overdose. Later, Alexander improved the syringe: the needle was marked with a finer needle. This series of improvements has also attracted the attention of many doctors, and made the syringe widely used.