| http://www.w3.org/ns/prov#value | - Examples of the types of sounding apertures or surfaces which may be formed on the body of the catheter 100 or tissue-penetrating element 102 to enhance visualization thereof by an active imaging device 50 are described in U.S. Pat. No. 4,977,897 (Hurwitz). [0211]FIG. 5d shows a sy
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