Abstract: A multi-layer display (MLD) system may include a plurality of display screens including at least first and second display screens arranged in a substantially parallel and overlapping manner, such that an air gap exists between the first display screen and the second display screen. An opening in the enclosure may exist such that air can flow through the opening between the air gap and outside of the enclosure, and a membrane covering the opening, the membrane being porous to air and non-porous to small particulates and water.

Abstract: A visual display device including a plurality of stacked display layers displaying a plurality of objects. A first reflective surface is positioned at an angle to the plurality of stacked display layers, and projects a first subset of objects in a first direction towards a viewer. The first subset of objects is projected as if originating from a first focal attentional region comprising a first plurality of object planes. A second reflective surface is positioned at the angle to the first plurality of stacked display layers. The first and second reflective surfaces are approximately parallel to each other. The second reflective surface projects a second subset of objects in the first direction towards the viewer. The second subset of objects is projected as if originating from a second focal attentional region comprising a second plurality of object planes.

Abstract: A visual display device including a plurality of stacked display layers displaying a plurality of objects. A first reflective surface is positioned at an angle to the plurality of stacked display layers, and projects a first subset of objects in a first direction towards a viewer. The first subset of objects is projected as if originating from a first focal attentional region comprising a first plurality of object planes. A second reflective surface is positioned at the angle to the first plurality of stacked display layers. The first and second reflective surfaces are approximately parallel to each other. The second reflective surface projects a second subset of objects in the first direction towards the viewer. The second subset of objects is projected as if originating from a second focal attentional region comprising a second plurality of object planes.

Abstract: A multi-layer display (MLD) system may include a plurality of display screens including at least first and second display screens arranged in a substantially parallel and overlapping manner, such that an air gap exists between the first display screen and the second display screen. An opening in the enclosure may exist such that air can flow through the opening between the air gap and outside of the enclosure, and a membrane covering the opening, the membrane being porous to air and non-porous to small particulates and water.

Abstract: A femoral sizing jig for use in total arthroplasty of left and right knees, comprises a femoral body, an external-rotation-angle arm which is, preferably pivotable, relative to the femoral body for setting an external angular rotation of a left or right femur, at least one of a cutting-jig guide and a cutting jig which is, preferably slidable, relative to the femoral body and in unison with movement of the external rotation-angle arm, and a medial posterior-condylar locator which is movable in unison with the movement of the external-rotation-angle arm, so as to maintain a fixed or substantially fixed relative distance with a medial side of the at least one of a cutting-jig guide and a cutting jig. A posterior-referencing femur resecting system using said femoral sizing jig and a method of resecting a femur at a knee joint relative to the medial posterior condyle are also provided.

Abstract: A visual display device including a plurality of stacked display layers displaying a plurality of objects. A first reflective surface is positioned at an angle to the plurality of stacked display layers, and projects a first subset of objects in a first direction towards a viewer. The first subset of objects is projected as if originating from a first focal attentional region comprising a first plurality of object planes. A second reflective surface is positioned at the angle to the first plurality of stacked display layers. The first and second reflective surfaces are approximately parallel to each other. The second reflective surface projects a second subset of objects in the first direction towards the viewer. The second subset of objects is projected as if originating from a second focal attentional region comprising a second plurality of object planes.

Abstract: A femoral sizing jig for use in total arthroplasty of left and right knees, comprises a femoral body, an external-rotation-angle arm which is, preferably pivotable, relative to the femoral body for setting an external angular rotation of a left or right femur, at least one of a cutting-jig guide and a cutting jig which is, preferably slidable, relative to the femoral body and in unison with movement of the external rotation-angle arm, and a medial posterior-condylar locator which is movable in unison with the movement of the external-rotation-angle arm, so as to maintain a fixed or substantially fixed relative distance with a medial side of the at least one of a cutting-jig guide and a cutting jig. A posterior-referencing femur resecting system using said femoral sizing jig and a method of resecting a femur at a knee joint relative to the medial posterior condyle are also provided.

Abstract: A circuit board on which the electronic components providing power to a series of light sources is positioned as near as possible to light sources in order to minimize parasitic energy losses which would be introduced by lengths of wiring. The light sources are usually elongate tubular Cold Cathode Fluorescent Tubes arranged parallel to one another in a single plane and the circuit board may be mounted directly over the light sources, towards one end of the tubes. Standard PCB board-to-board connectors may be provided at an edge of the circuit board and a further circuit board provided with a series of conductive tracks may provide both a mechanical and electrical connection between the circuit board and the light sources. A power distribution method is also disclosed in which both current and temperature of the light sources are monitored and regulated in order to extend the lifetime of the light sources and to stabilize their brightness.

Abstract: A pedicle attachment assembly includes a pedicle attachment device having a head. A polyaxial housing has a through bore comprising a base portion and two posts upstanding from the base portion, the posts defining therebetween a slot for receiving a rod. A saddle-shaped element is disposable in the slot and has a part cylindrical recess in an upper surface for engagement in use with the rod. The saddle-shaped element has a convex lower portion for engagement in a complimentary concave recess in an upper surface of the head of the attachment device. The lower surface of the head of the attachment device and the lower end of the through bore in the housing have complementary part spherical surfaces for engagement with one another. A cap assembly is provided for clamping the rod in the housing.

Abstract: The pedicle attachment assembly comprises a pedicle attachment device having a head. A polyaxial housing has a through bore comprising a base portion and two posts upstanding from the base portion, the posts defining therebetween a slot for receiving a rod. A saddle-shaped element is disposable in the slot and has a part cylindrical recess in an upper surface for engagement in use with the rod. The saddle-shaped element has a convex lower portion for engagement in a complimentary concave recess in an upper surface of the head of the attachment device. The lower surface of the head of the attachment device and the lower end of the through bore in the housing have complementary part spherical surfaces for engagement with one another. A cap assembly is provided for clamping the rod in the housing.