| http://www.w3.org/ns/prov#value | - A solution containing the desired therapeutic or diagnostic substance is introduced into the lumen 22 of the tube 20 by a syringe and needle 28, as shown in FIG. 2A. The tube 20 is constructed of porous or permeable material such as expanded polytetrafluoroethylene (ePTFE) or a bioabsorbable material such as porous poly (L-lactic acid) (PLLA) or poly(L-glycolic acid) (PLGA,) etc. which allows the
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