| http://www.w3.org/ns/prov#value | - an tube of a patient; an electrode tip situated at the first end of the catheter, the electrode tip including a first portion having a first electrode situated thereon, and a second portion having a second electrode situated thereon, the second portion of the electrode tip being selectively spaced from the first portion of the electrode tip and movable axially relative thereto, the electrode tip b
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