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    • 7. 发明授权
    • Patella recession instrument and method for anatomically-shaped patellar
prostheses
    • 髌骨切除仪器及解剖形状髌骨假体的方法
    • US5716360A
    • 1998-02-10
    • US497537
    • 1995-06-30
    • James L. BaldwinJames M. FreidSteven I. WhitlockMark L. Rehmann
    • James L. BaldwinJames M. FreidSteven I. WhitlockMark L. Rehmann
    • A61B17/16A61B17/17A61B19/00A61B17/56
    • A61B17/1677A61B17/1767A61B2017/1602A61B2090/033
    • A patella recession instrument (10) and method provides a guide for producing an oval, tri-oval, or elliptically shaped recess on the posterior surface of the osteotomized patella for receiving a similarly shaped backing portion of a patellar implant. The apparatus includes a guide bushing (12) and a bushing positioning mechanism (14) for securing the bushing against the posterior of the osteotomized patella, with a guide opening (54) formed through the bushing covering the total area to be recessed. A reamer guide structure, which may be a separate structure (16) received in the bushing guide opening (54) or integrally formed with the bushing (12), receives one or more rotary reamer tools (18) in a plurality of reaming positions. The cutting face (80) of the rotary reamer tool (18) in each different reaming position covers a different portion of the total area to be recessed. The recession method includes securing the guide bushing (12) in the proper operating position against the patella, sequentially positioning the cutting face (80) of the reamer tool (18) or tools in the plurality of different reaming positions, and operating the tool or tools to produce a series of intermediate recesses that combine to approximate the total area to be recessed.
    • 髌骨衰退仪器(10)和方法提供了用于在截骨的髌骨的后表面上产生椭圆形,三椭圆形或椭圆形凹陷的引导件,用于接收髌骨植入物的类似形状的背衬部分。 所述装置包括用于将所述套管固定在所述截骨的髌骨的后部的引导衬套(12)和衬套定位机构(14),所述引导开口(54)穿过所述衬套形成,所述导向开口穿过所述衬套覆盖要被凹进的总体区域。 可以是容纳在衬套引导开口(54)中或与衬套(12)一体形成)的单独结构(16)的扩孔器引导结构在多个铰接位置中接收一个或多个旋转扩孔器工具(18)。 每个不同的铰接位置的旋转扩孔器工具(18)的切割面(80)覆盖要凹进的总面积的不同部分。 经济衰退的方法包括将引导衬套(12)固定在抵靠髌骨的适当操作位置,顺序地将扩孔器工具(18)的切割面(80)或工具放置在多个不同的铰孔位置中,并操作工具或 用于生产一系列中间凹槽的工具,其组合以接近要凹进的总面积。