| 摘要 |
<p>A thoracentesis needle assembly comprises a longitudinally extending hollow needle (20) which is sharp at its distal end, a longitudinally extending hollow probe (50) which extends through the hollow needle and has a blunt distal end (52) with an opening (54), a spring (80) which is coupled to the probe and which resiliently biases the probe forward with respect to the hollow needle such that the blunt distal end of the probe extends past the sharp distal end of the needle, a hollow housing (30) which is fixed to the needle and which houses the spring and permits movement of the probe relative to the housing, a hollow luer adapter (112) providing a flow path for fluid, and an automatic check valve (100) in the fluid flow path, where the automatic check valve (100) permits flow of fluid in a proximal direction, but prevents flow of fluid in a distal direction.</p> |
