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Design - PUMP DESIGN AND PERISTALSIS ADVANTAGES

Autoclude Peristaltic Pumps - Products Section

One of the early unique features of the Autoclude concept for peristaltic pumps was the development of a cartridge system - patented world-wide by the company. With the cartridge system on the 1000 and 2000 series pumpheads Autoclude users enjoy advantages.

A. Tube changes in seconds.
B. Tube is locked into position - no 'creeping' in use. Set up errors eliminated.

Tube cartridges are available in autoclavable polysulphone or clear K-resin which can be sterilised by gamma irradiation or ethylene oxide. The tube stays in the cartridge during the sterilisation process.

Tube 'creep' from the pressure of the rotating rollers is eliminated by utilising a dovetail section tube which is locked into the cartridge by ultrasonic welding.

When tube wears through fatigue - simply unclip the old cartridge and clip into position a new cartridge - no other adjustment necessary. All pumps are factory set for correct occlusion but can be adjusted by the user.

Developments at Autoclude produced simple, cost effective designs which quickly replaced the unreliable designs incorporating springs.

HOW A PERISTALTIC PUMP OPERATES

The peristaltic design must be the oldest pump style, with origins from way back in history. The Greek language has 'peristalsis' to describe the operation of a wave of automatic contractions, propelling contents along body tubes to transport food and body waste. Simply substitute body tube for thermoplastic tube and we have the application of the peristaltic action to pumps. By mechanical simulation the tube walls are squeezed together to form a seal as the roller moves along the tube - the previously compressed tube regains original form and sucks fluid/gas into the formed vacuum to create a self-priming function.

The fluid/gas will follow the rollers until the tube is no longer compressed and by this time a 2nd or even 3rd roller is compressing the tube, preventing flow back, pushing the initial dose of fluid/gas out of the pump. By a repetitive operation as the rollers rotate we are creating a pumping movement which has an element of pulsing as a standard. By the squeezing of the tube the rotor creates suction lift and outlet pressure.

Peristaltic pumps designed and manufactured by Autoclude all operate with the roller rotor formation and the tube creating a movement of liquid through 180°. Other forms of peristalsis would create this movement through 120° but generally in such instances the flow volume is much reduced.

Consideration should be given regarding the delivery pressure required from a peristaltic pump, as most peristaltic pumps operate with a delivery pressure of less than 1 bar unless some form of exceptionally thick wall or reinforced tubing is used.