| http://www.w3.org/ns/prov#value | - A catheter, comprising: a wall surrounding a lumen, the wall including a polymeric inner portion forming an outer surface of the lumen and a polymeric outer portion surrounding at least a portion of an outer surface of the inner portion, a first diffusion rate of a therapeutic compound from the lumen through the inner portion being greater than a second diffusion rate through the outer portion, a
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