| 摘要 |
An improved biopsy needle includes a cannula having an open back end and a tip portion, the open back end is retained in a removeably fixed position by a biopsy gun. The cannula tip portion has a retractable cover for covering a cutting instrument when the cannula is inserted into the patient's body. The cutting instrument is integrally mounted along a lower edge of the cannula tip portion. A set of female threads is mounted along an inner circumference of the cannula at a distal end thereof, proximal to the cannula tip portion and the retractable cover. The retractable cover opens and exposes the cutting instrument when the cannula tip portion rotates and the retractable cover encloses the cutting instrument when the cannula tip portion is at rest. The cannula tip portion rotates in response to the biopsy gun firing a shot.
|
