Nuffield 200 ventilator – Stand-Alone Ventilation System for Anaesthesia and Resuscitation
Designed by Penlon, the Nuffield 200 ventilator stands out for its mechanical simplicity and clinical effectiveness. Entirely pneumatic, it operates without a power supply, making it particularly reliable and suitable for a variety of hospital settings. Its system is based on a fluid logic unit coupled with a patient valve, enabling time-cycled mechanical ventilation at a constant flow rate.
The Nuffield 200 is calibrated for an operating pressure of 340 kPa with medical oxygen, but can operate within a range of 300 to 680 kPa. Most of the gas source is used to ventilate the patient, while a small portion feeds the control circuit. This design ensures optimised gas consumption while providing continuous and safe ventilation.
The fully removable patient valve ensures safe pressure reduction and automatic inspiratory/expiratory alternation. It incorporates an overpressure valve set at 60 cmH₂O. It is designed to allow the smooth flow of gases and protect the patient in the event of overpressure. This valve can be sterilised at 136°C and is suitable for paediatric or adult circuits.
Ventilation is controlled by three parameters: inspiratory time (0.2 to 2.0 seconds), expiratory time (0.5 to 4.0 seconds) and inspiratory flow rate (0.25 to 1 L/sec). The tidal volume is calculated by combining these settings, allowing customisation according to the patient's needs. The respiratory rate is determined by the sum of the inspiratory and expiratory times, ranging from 10 to 86 cycles per minute.
The Nuffield 200 is suitable for anaesthesia ventilation with coaxial circuits or resuscitation with a face mask, particularly in combination with Mapleson D or T-Piece circuits. It is also compatible with the Newton valve, designed for ventilating newborns and infants, offering precise control at very low volumes. In this case, ventilation becomes purely pressure-controlled, ideal for small patients weighing up to 20 kg.
The ventilator includes an analogue pressure gauge to display the pressure in the circuit and can be connected to an anaesthetic gas recovery system to limit the risk of exposure to staff. It operates from dry, filtered, oil-free gas sources, whether from hospital pipelines or cylinders.
The Nuffield 200 is easy to install on any type of structure using dedicated supports (universal, Modura, Medirail). Its compact design (270 x 210 x 100 mm) and light weight (3.25 kg) make it highly mobile and adaptable to critical environments.
Reliable, robust and easy to use, the Nuffield 200 remains a benchmark in the field of pneumatic anaesthesia ventilators, particularly appreciated for its durability and easy maintenance.
