| 摘要 |
An improved biopsy needle having an outer cannula, an inner tube and a stylet. The distal end of the inner tube is provided with a snare in the form of a coil extending from the inner tube. The free end of the coil is adhered to the inner surface of the outer cannula. Upon rotation of the inner tube with respect to the outer cannula, the coil will decrease in diameter to either sever or hold the biopsy piece within the outer needle. After removal of the needle from the patient, rotating the inner tube in the opposite direction will cause the coil to expand to its original diameter and allow the biopsy piece to be removed from the needle. |
