| 摘要 |
A catheter sheath 12 includes a tubular member 14 defining a lumen 18, a distal region of the tubular member 14 defining a plurality of discrete elements 28. The discrete elements 28 are displaceable between a first position in which the discrete elements 28 extend parallel to a longitudinal axis of the tubular member 14 and a second position in which the discrete elements 28 project outwardly transverse to the longitudinal axis of the tubular member 14. A plurality of electrical conductors 30 is associated with the tubular member 14, the conductors 30 projecting into the distal region of the tubular member 14. A sleeve is about the tubular member 14, the sleeve and the tubular member 14 being displaceable axially with respect to each other for effecting displacement of the discrete elements 28 between their first and second positions. At least one electrode 36 is carried by at least one of the discrete elements 28, the at least one electrode 36 being in an operative position when the discrete elements 28 are in their second position.
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