| 摘要 |
<p>A modular intramedullary nail which, selectively, includes two or three connectable sections that are connectable end to end. In the two section nail the second section is an elongated curved nail component having an elongated, open-ended longitudinal bore, and terminating in a distal end. The three section nail includes an upper proximal nail component having an open-ended bore. The second section is a central nail section that is an elongated curved nail component having an open ended longitudinal bore. The third section is a lower distal nail component having an elongated open ended longitudinal bore. The nail components are connected at the end using corresponding conical socket and conical projecting end portions of adjoining end nail components that can be fitted together and secured upon impact. Upon assembly, the connections are self orienting, providing corresponding tooled 'flat' portions adjacent the respective conical socket and conical projecting end portions of the nail components. This interlocking tooled flats align and abut upon assembly so that the adjoining nail components only align in one relative rotational position. The assembled nail thus provides an elongated continuous open ended bore that receives a cannulated fastener. In the three section nail, the fastener extends the full length of the longitudinal bore of the assembled three nail sections. In the two section nail, the fastener extends into the distal end. An upper enlarged head portion of the cannulated fastener grips the proximal nail component. The distal end portion of the cannulated fastener has external threads which engage corresponding internal threads within the bore of the distal nail component.</p> |
