Abstract: An alignment guide for setting the position and depth of a guide pin to be inserted into a bone. The alignment guide includes a mechanical assembly for deploying a calibrated guide rod along a selected external surface of the bone and for adjusting the guide rod so it lies parallel to a desired path extending through the bone for a selected distance. The position and orientation of the guide rod may be adjusted using imaging means for viewing the location of the desired path extending through the bone parallel to the guide rod. The alignment guide is mechanically linked to apparatus for subsequently inserting a guide pin into the bone parallel to the guide rod. In one embodiment the alignment guide is designed to aid a surgeon in centering the guide pin to be inserted in the femoral head and neck without repeated trial-and-error drilling.

Abstract: An alignment guide for setting the position and depth of a guide pin to be inserted into a bone. The alignment guide includes a mechanical assembly for deploying a calibrated guide rod along a selected external surface of the bone and for adjusting the guide rod so it lies parallel to a desired path extending through the bone for a selected distance. The position and orientation of the guide rod may be adjusted using imaging means for viewing the location of the desired path extending through the bone parallel to the guide rod. The alignment guide is mechanically linked to apparatus for subsequently inserting a guide pin into the bone parallel to the guide rod. In one embodiment the alignment guide is designed to aid a surgeon in centering the guide pin to be inserted in the femoral head and neck without repeated trial-and-error drilling.

Abstract: A liquid crystal projector which splits white light projected from a light source and light-intensity-modulates and synthesizes the split light components to project the synthesized light components onto a screen. The projector includes a dichroic mirror having a light transmittance characteristic in which two color light components of the three color light components being adjacent in spectrum are transmitted, and a dichroic mirror having a light transmittance characteristic in which the remaining color light excluding the two color light components is reflected. The location of the light source is appropriately modified inside the projector. Accordingly, the production cost is reduced, the heat produced by the light source is not exhausted toward the viewers and the projector is miniaturized.

Abstract: The present disclosure describes a high power magnifying projector using a liquid crystal light valve.