The invention relates to a method for producing a membrane module, comprising a plurality of elongated filter elements disposed in parallel adjacent to one another, each element comprising a longitudinal channel, a housing enclosing the filter elements, and a collector chamber between the housing and the filter elements. The present invention also relates to methods of trating pain using these compounds and pharmaceutical compositions including these compounds. The LDPC decoder can be either a sum-product algorithm decoder or a Min-Sum decoder. A saddle is positioned in the interior of the tulip and receives the end of the threaded shaft on one end and can include a trough on its opposite face which can receive a rod that connects together two or more such assemblies. Alternatively, the steering tendons may be located angularly separated from each other, thus causing the deflection profiles to be bidirectional.