A laser targeting device for use with image intensifiers

摘要

A laser targeting device for use during surgical procedures provides means for the precise co-axial alignment of a narrow laser beam (23) with an x-ray beam (7). The device has a case (13) which contains a reflecting mirror (92) mounted at 45 DEG on a low mass assembly. The mirror lies directly in front of a radio-opaque cruciform target (88). The case is adjustably mounted so that the image of the crosshair target may be accurately centred on the target head. A calibration aid (117) is used to pinpoint the emanation point of the x-ray beam from the source cone of the image intensifier (5). The angle at which the laser beam strikes the mirror may be varied in two planes. When the crosshair image is centred and the laser beam is directed onto the emanation point the two beams are rendered precisely co-axial. Accurate drilling along the laser beam path without further recourse to x-ray screening is more accurate and eliminates direct exposure of the surgeon to irradiation during orthopaedic procedures. A series of special drapes (129,147) is provided for the device.