The Chinese first aid symbol is a snake coiled on a pole, not a sword.
This symbol comes from the Bible story, Moses led the people of Israel out of Egypt, in the wilderness, the people of Israel complained about the life of the bitter, complaining about God, God told the people of Israel to live in sickness and die, Moses for the people of Israel to plead with God, God back to his heart, he told Moses to set up a pole, the top of the pole cast a copper snake, sick people once they see the copper snake, the disease will be cured.
The story of the serpent's staff
Western medicine uses the "serpent's staff" as its symbol. The so-called "snake staff" is a walking stick coiled with a snake pattern.
Here is another allusion to the ancient Greek legend: one of the founders of the ancient Greek medicine - Asklepios, legend has it that it is the son of Apollo, the god of the sun, and the mortal Koroni, who once followed the highly skilled Kailon to study medicine, and was very skillful in medicine.
One day, he was contemplating a case, a poisonous snake crawled, coiled in his hand on the battle, Asklepios was shocked, and immediately killed the snake, who knew that at this time there is a poisonous snake, the mouth of the herb, ambushed in the side of the dead snake, with the herb on the dead snake, the results of the dead snake resurrection.