| 摘要 |
A flexible biopsy needle assembly includes a flexible coring stylet that is slidably disposed within a flexible outer cannula. The stylet includes an elongated body, a tip, a sampling notch adjacent to the tip, and at least one ferrule along the length of the body. The cannula includes an elongated tubular body defining a lumen sized for sliding passage of the stylet, a cutting edge at the opening of the lumen, and an array of slits along the length of its body. The slits are sized to allow the diameter of the ferrule(s) to extend partially therein. The slits and ferrule(s) interact to limit or control the flexibility of the cannula at the location of the slits. |
| 主权项 |
1. A selectively bendable biopsy cannula assembly, comprising:
an elongated flexible inner body sized for introducing into a patient and having at least one ferrule spaced along the length of the body, the ferrule defining a diameter; and an elongated flexible tubular body sized for introduction into a patient, and defining a lumen sized for sliding passage of the inner body therethrough, and having at least one slit disposed along the length of the tubular body and said at least one slit defined in and extending between the inner and outer diameter of the tubular body, wherein the diameter of the ferrule is sized to extend at least partially into the slit when the ferrule is aligned with said slit and when the elongated flexible tubular body is urged to flex, the bending of the elongated flexible tubular body is prevented or significantly limited. |
