U sing hypodermic needles to deliver drugs has been common for more than a century. The past hundred years have seen all manner of medical advances, from antibiotics and x-rays to m RNA vaccines and immunological cancer treatments. Yet the needle has stayed mostly unchanged. Although now available in a variety of different sizes, it remains, in essence, a hollow, pointy tube.
u唱着皮下注射针头输送药物已经很普遍了一个多世纪。从抗生素和X射线到M RNA疫苗和免疫癌症治疗，过去百年来，已经看到了各种医学进展。然而，针头大多保持不变。尽管现在有各种不同的尺寸，但本质上仍然是一个空心的尖型管。
