Ruisku

Ruisku is a Finnish term with several meanings. In everyday language it most often refers to a syringe, a medical instrument used to inject medications or withdraw fluids. A typical syringe consists of a transparent barrel, a movable plunger, and a tip for attaching a needle or adapter. Disposable plastic syringes are common in health care, and syringes come in sizes and fittings such as Luer-Lock and Luer-Slip. Some models include safety features to reduce needlestick injuries. Syringes are used in vaccination, anesthesia, diagnostics, and laboratory work, and are typically sterilized and discarded after a single use.

In engineering contexts, ruisku may mean a fuel injector or injector system. A fuel injector is a valve that delivers a measured amount of fuel into the engine’s intake port or combustion chamber, controlled by an electronic control unit. Modern engines employ multiple injectors with precise timing to optimize the fuel-air mixture, efficiency, and emissions. Injectors differ in design, including port and direct-injection types, and require regular maintenance and clean fuel.

Historically, the hypodermic syringe was developed in the mid-19th century, with key contributions from Charles Gabriel Pravaz and Alexander Wood around 1853, enabling modern medicine and diagnostics.

See also: injection, syringes, fuel injection.