| 摘要 |
The disclosure pertains to devices and methods for treating tension pneumothorax. In one representative embodiment, a needle assembly comprises an outer cannula defining a lumen and having a distal end portion comprising a sharp bevel, and an inner cannula slidably disposed through the lumen of the outer cannula. The inner cannula is movable between an extended position and a retracted position. The inner cannula also has a blunt distal end portion, which is configured to extend beyond the sharp bevel of the outer cannula when the inner cannula is in the extended position. The blunt distal end portion is configured to be retracted within the lumen of the outer cannula when the inner cannula is in the retracted position, thereby exposing the sharp bevel. The needle assembly further comprises a bias disposed inside the housing and coupled to the inner cannula. A proximal end portion of the inner cannula is configured to extend through the housing when the inner cannula is in the retracted position. |
