| 摘要 |
A surgical trocar instrument is provided which includes a trocar spike designed to prevent coring of the needlepoint of a trocar tube and which is secured to a knob or holding assembly in a manner that the trocar tube resists relative rotational movement and the spike assembly is biased outwardly of the needlenose of the trocar tube, but the bias may be overcome upon insertion of the trocar tube through a cavity wall, with the bias moving the spike assembly outwardly of the trocar tube to prevent coring during additional surgical maneuvers.
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