| 摘要 |
A penetrating instrument for penetrating an anatomical cavity wall to gain access to the anatomical cavity includes a penetrating member having a distal end for penetrating the anatomical cavity wall, a plurality of probes disposed in the penetrating member, and an indicating mechanism operatively associated with the probes for displaying a sequence of sensible signals in response to movement of the probes during penetration of the anatomical cavity wall. Each of the probes has a distal end movable relative to the penetrating member between an extended position where the distal end of the probe protrudes from the distal end of the penetrating member and a retracted position where the distal end of the probe recedes into the penetrating member. In the retracted positions, respective distal ends of the probes are at axially spaced locations along the distal end of the penetrating member such that movement of the probes from the extended positions to the retracted positions occurs sequentially in response to penetration of the anatomical cavity wall by the penetrating member, and movement of the probes from the retracted positions to the extended positions occurs sequentially in response to penetration into the anatomical cavity by the penetrating member.
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