A mains electricity (AC-powered) device, which may include internal rechargeable batteries, intended to facilitate the accurate and consistent administration of non-specific fluid medications from a standard infusion bag, syringe, or bottle, into a patient via intravenous, subcutaneous, arterial, epidural, and intracavital routes. It consists of a unit with a motor designed to drive pistons in a circular motion inside a replaceable cylinder, and which is connected to a disposable infusion administration set (e.g., tubing, filter, connectors, needle/catheter).