| 摘要 |
<p>A device for indicating penetration of the trachea 3 or the like has a hollow needle 2 with a cutting tip 20 and connected at one end to a handle 1. A gas flow sensor 21 in the needle 2 provides an electrical output to a processor 10 and display 12 in the handle. The display 12 indicates both level of gas flow at the tip of the needle and the direction of flow. When the display 12 indicates a gas flow with alternating direction it is immediately apparent that the needle tip 20 is in the trachea 3.</p> |
