Hyposprays are a type of medical tool called a jet injector. There are a few synonyms that can be used for hyposprays, such as "jet injectors," "needle-free injectors," or "air injectors." All of these terms describe a device that uses a high-pressure jet of medication or vaccine to penetrate the skin and deliver the substance into the muscle tissue. Some other terms that may be used to describe hyposprays are "bloodless injectors" or "non-invasive injectors" because they do not require a needle to be inserted into the body. Hyposprays are often used in situations where injections are needed quickly, such as during emergency medical procedures.