The appearance of the syringe is an epoch-making revolution in the field of medical appliances. The process of drawing and injecting gas or liquid with a needle is called injection. The syringe is composed of a needle barrel with a small hole in the front end and a matching piston core rod. It is used to inject a small amount of liquid or into areas that cannot be accessed by other methods or withdraw from those places. When the core rod is pulled out, the liquid Or gas is sucked in from the small hole at the front end of the syringe, and the liquid or gas is squeezed out when the core rod is pushed in.
According to medical history books, the initial form of the syringe was an enema. Zhang Zhongjing, a medical scientist in the Han Dynasty in China, wrote in his "Treatise on Febrile Diseases" (written in 219 AD) "The Whole Story of Yangming": "Yangming disease, spontaneous sweating, if sweating, urinary self-interest, this is the body fluid Exhaustion is hard to attack, but when you want to have a bowel movement, you should decoct it with honey. If the roots of cucumber and pig bile can be used as a guide." It is also clear in the article "Pig Bile Recipe" in this book. Point out: "One big pig gallbladder, a little purged juice and a little old vinegar, can be used to irrigate the valley (anus), such as eating a hectare, when defecation, it is very effective for eating evil things." How to "irrigate the valley"?
He wrote: "Take a small bamboo tube...into the valley." This small bamboo tube is the embryonic form of an enema-a syringe.