P.E.T.™ ensures optimum distribution of the flow around capillaries to guarantee ideal transport and removal.
Standard capillary bundles often suffer uneven flow distribution around the capillaries: Some groups of capillaries form strains and as a consequence there are areas of stagnant flow within and shunt-flows around the strains. This results in loss of active outer capillary surface and thus loss of performance. For a dialyser, poor bundle architecture will result in poor dialysate distribution and thus loss of clearance of toxins.
Therefore 3M developed Performance Enhancing Technology – P.E.T. After the undulation of capillary membranes Poly-Ethylene-Terephthalate-spacer yarns consisting of multifilament threads are integrated into the fibre bundle.