| 摘要 |
A biopsy needle has a forward needle opening that can be closed off with a trap door. The trap door is pivotally mounted to a flat top surface inside the needle opening. As the needle is extracted, a forward blade of the trap door cuts into the biopsy tissue and the trap door pivots about a pivot axis extending transversely to a longitudinal direction of the needle. The trap door is configured to match a contour of the top surface and an adjacent curve of the needle opening to maintain the needle substantially open when the trap door is in the open position and to close the forward needle opening when the trap door is in the closed position and the biopsy tissue specimen is entrapped inside the needle.
|
