| 摘要 |
PCT No. PCT/GB87/00014 Sec. 371 Date Sep. 23, 1987 Sec. 102(e) Date Sep. 23, 1987 PCT Filed Jan. 13, 1987 PCT Pub. No. WO87/04080 PCT Pub. Date Jul. 16, 1987.A surgical catheter for use on a patient undergoing NMR examination is composed of an elongated element made up of axial segments which are composed of materials which alternate from being highly opaque under NMR examination and less opaque under NMR examination, thereby enabling identification of the entire length of the catheter in the NMR field.
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