当不使用递送套管时，可以用管心针填充递送套管内腔。
A stylet may be used to occupy the lumen of the guide cannula when the delivery cannula is not in use.
本发明涉及一种便于管子前进穿过体腔的复杂通道的管心针装置。
The present invention is directed to a stylet device to allow easy advancement of a tube through complex passages of body cavities.
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