Apparatus for removal of bone cement
    9.
    发明授权
    Apparatus for removal of bone cement 失效
    用于去除骨水泥的装置

    公开(公告)号:US5064426A

    公开(公告)日:1991-11-12

    申请号:US319949

    申请日:1989-03-07

    Abstract: Bone cement is removed from a bone cavity, such as the intramedullary canal, during a prosthetic revision. The bond cement is pre-molded by a thermal chisel which includes a shaft for extending into the bone cavity, a plasticizer chisel on a working end of the shaft, and a heat element carried by the shaft for heating the chisel to a temperature within a range of temperatures sufficient to plasticize the bone cement. This deforms and weakens the bone cement upon direct non-impact type contact between the heated tip of the chisel and the cement. The cement is removed by pre-molding it with the heated working end of the thermal chisel, preferably by molding a distally located circumferential furrow in the bone cement and then molding circumferentially spaced apart longitudinal furrows from the circumferential groove to the proximal end of the bone cement. Upon rehardening of the bone cement, these thermally molded furrows form weakened areas within the bone cement so that the regions of bone cement between the weakened areas can be removed by an impact type chisel. Preferably, each section of bone cement is removed intact by impact force applied to a molded step groove in a proximal end surface of the section. Removal of the bone cement in sections by these procedures avoids harmful heat transfer to the bone wall.

    Abstract translation: 在修补期间,将骨水泥从骨腔(例如髓内管)中移除。 粘结胶水由热凿子预先模制,该热凿子包括用于延伸到骨腔中的轴,在轴的工作端上的增塑剂凿子,以及由轴承载的用于将凿子加热至 足以塑化骨水泥的温度范围。 在凿子的加热尖端和水泥之间的直接非冲击型接触时,这会使骨水泥变形并变弱。 通过用热凿的加热的工作端预先模制水泥,优选通过在骨粘固剂中模制位于远端的圆周沟槽,然后将周向间隔开的纵向沟槽从周向凹槽到骨的近端模制而去除 水泥。 在骨水泥重新硬化时,这些热模制的沟槽在骨水泥中形成减弱的区域,使得弱化区域之间的骨水泥区域可以通过冲击式凿子去除。 优选地,通过施加到该部分的近端表面中的模制步骤槽的冲击力,完整地去除骨水泥的每个部分。 通过这些方法去除部分骨骨水泥,避免有害的热量传递到骨壁。

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