| http://www.w3.org/ns/prov#value | - A non-woven matrix of metal fibers having these desired properties that can be used in manufacture of the porous distal portion of the invention needle is available from the Bekaeart Corporation (Marietta, Ga.), and is sold under the trademark, BEKIPOR??? filter medium. [0031] The distal porous portion of the needle can also be fabricated from such porous materials as a porous polymer, such as a p
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