A new simple power injector.

A new simple pneumatic-hydraulic injection device has been constructed, tested, and used in clinical angiography. Is is the only injector which produces a square wave velocity curve with immediate rise time. Disposable plastic syringes are used which convert the velocity profile of the plunger into a smooth buildup time of the injectate, reducing recoil. The unit can be operated by both local or remote triggering. It has numerous advantages over commercially available devices, such as small size, simplicity of design, and safety features which eliminate shock hazards and reduce human error.