| 摘要 |
Biopsy needle for bone marrow biopsies or the like including a cannula (12, 102) a cannula housing supporting the cannula, and a stylet (14) including a stylet cap (40) supporting the stylet wherein the stylet engages into the cannula in a predetermined relationship and the stylet cap interlocks to the cannula housing. The biopsy needle is constructed to be either disposable or reusable depending upon the cannula housing and stylet cap material. The cannula housing includes vertical wings (24, 26) extending outwardly from the housing for engagement with the palm of a physician's hand, a cannula having formed ends which engage and secure into the cannula housing, and an elongated button (30) extending outwardly from the top of the cannula housing for detent locking (44) with the stylet cap providing for alignment of the stylet to the cannula of the biopsy needle. The end of the cannula is uniquely formed in a swaging, bevel and grinding, and buffing process providing a sharp knife edge. The stylet includes a longitudinal member having a ground and buffed beveled end (36) maintaining a knife-sharp edge around the tip, and the other end of the stylet is bent and molded into the stylet cap where the stylet cap includes a spring detent locking groove for interlocking with the button of the cannula housing. The stylet cap is rounded at the top and includes vertical grooves (50) for gripping during locking and unlocking. The stylet (34) inserts into the cannula and with a twist locks about the top of the cannula with a positive digital sensory feedback signal to the physician. An alternative embodiment discloses a cannula including a tubular cannular member with a preformed sharp end (104) and a clip (106) having outwardly extending flanges (110, 112) at an angle to each other soldered onto an upper portion for securing the cannula tube in the molded cannula housing (118). |
