公开(公告)号：US5190551A

公开(公告)日：1993-03-02

申请号：US628390

申请日：1990-12-14

申请人： ALbert K. Chin ,  Milton B. McColl ,  Kathryn J. Hoffman ,  Diane E. Caramore

发明人： ALbert K. Chin ,  Milton B. McColl ,  Kathryn J. Hoffman ,  Diane E. Caramore

IPC分类号： A61F2/46

CPC分类号： A61B17/8847

摘要： A cement plug received within a bone recess is extracted by forming a bore within the plug, tapping the bore to form internal screw threads therein, engaging the threads with a pulling tool, and applying tension to the tool to extract the plug. The bore is formed through means of a rod inserted into the plug while in a fluid state and/or a drill bit having a tubular guide received therearound to maintain the bit in generally aligned condition with the bone recess and limit the depth to which the bit penetrates the plug. The degree to which the bore is tapped and engaged by the pulling tool is controlled to avoid exceeding the extent of the bore and the screw threads formed therein. One embodiment employs a self-tapping extraction rod which serves both as a tap to form the screw threads and as the pulling tool to apply tension to extract the plug. Another embodiment employs a tap which is separate from the pulling tool. In both embodiments, a sleeve received around the tap and tool serves to measure and limit the extent to which the screw threads are formed and engaged.

摘要翻译： 容纳在骨凹槽内的水泥塞通过在塞子内形成一个孔而被抽出，从而在孔内敲击以在其中形成内螺纹，使其与牵引工具接合，并向工具施加张力以提取塞子。 通过在流体状态下插入插塞中的杆的方式形成孔，和/或具有接收在其周围的管状引导件的钻头，以将钻头保持在与骨凹槽大致对齐的状态并限制钻头的深度 穿过插头。 控制钻孔和拉动工具接合的程度，以避免超过其中形成的孔和螺纹的程度。 一个实施例采用自攻丝提取杆，其既用作丝锥形成螺纹，又用作牵引工具以施加张力以提取塞子。 另一个实施例采用与牵引工具分开的水龙头。 在两个实施例中，围绕丝锥和工具容纳的套筒用于测量和限制螺纹形成和接合的程度。