| 摘要 |
A rotary blade assembly is provided with a stationary outer tube having a cutting window at its distal tip. The window has a curvilinear profile defined by a peripheral rim surrounded entirely by a land surface angled relative to the rim. The inclination of the land produces a sharp edge around the periphery of the window of the outer member. The curvilinear window is produced by a single step manufacturing process which creates the window opening at the same time that the land surrounding the opening is inclined.
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