| 摘要 |
The present invention provides a medical system comprising an elongated medical device having a longitudinal lumen, such as a catheter or a needle, and a stylet configured to be inserted into and subsequently removed from the longitudinal lumen. The stylet is configured to have at least one indicator that indicates that the distal end of the stylet is about to exit the lumen as the stylet is being withdrawn during use. Each indicator alerts the user that the stylet is almost completely withdrawn from the lumen such that the user may take proper precautions and prevent the stylet from inadvertently and uncontrollably exiting the lumen. Each indicator may be located in the proximity of the distal end of the stylet and present either a visual, physical, or audible indication. Additionally, the present invention provides a method that indicates the longitudinal position of a stylet relative to an elongated medical device.
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