Does anyone know what kind of filter or who makes a filter for high cut off dialysis? (or high cut off membrane)

Any tips?

What do you mean by high cut off dialysis or high cut off membrane?

I am not familiar with that term either.

Kidney,
do you mean 'high flux'?

High Cut Off is a new dialyser developed by Gambro. The cut off is 45 KDA allowing the removal of free light chains. This dialyser is used on Acute Myeloma Kidney patients (Cast Nephropathy) and prevents permanent dialysis in 70% of this patient group.