Abstract: A method for performing a pupillary stimulus threshold test on at least one eye of a test subject, the method comprising: delivering at least one visual stimulus to the at least one eye of the test subject, wherein the least one visual stimulus comprises a flash of light having an intensity and a duration; obtaining at least one pupillary response from the at least one eye of the test subject, wherein the at least one pupillary response corresponds to whether or not the test subject's pupil contracted in response to the at least one visual stimulus; and determining the lowest intensity of light that causes the test subject's pupil to contract based on the at least one pupillary response from the test subject.

Abstract: Instrumentation for surgically resurfacing a femoral condyle to receive a prosthetic femoral component in minimally invasive unicompartmental knee replacement surgery. The instrumentation includes a resurfacing guide for attachment to a femur and a rail member externally delineating an area of a femoral condyle of the femur that is to be surgically resurfaced to receive a prosthetic femoral component. The resurfacing guide has an abutment wall. The instrumentation includes a resurfacing instrument having a tissue removing surface for removing anatomical tissue from the delineated area of the femoral condyle, the tissue removing surface being movable along the delineated area to remove anatomical tissue therefrom. The resurfacing instrument has a engagement wall for contacting the abutment wall to limit the depth to which anatomical tissue is removed.

Abstract: A cordless mower, including a start-up key that must be removed to charge a battery. The start-up key must be inserted to operate the motor, and can be moved to a different position or removed to interrupt the motor. The mower cannot be operated when the switch is not actuated. Some embodiments include a lockout relay that disables charging of the battery when a charge on the battery exceeds a predetermined threshold. Thus, the cordless mower can be safely charged by removing the start-up key and inserting a charge connector that cannot otherwise be inserted. The cordless mower can be safely powered by inserting the start-up key and moving it into an operation position, and then closing the switch to run the mower. The cordless mower can be safely shut off in an emergency by removing the start-up key or moving it to a safety position.

Abstract: A power tool and system for trimming and cutting vegetation are disclosed. A method of attaching a working assembly, such as blade carrier assembly, to a power tool is also disclosed. The power tool includes interchangeable cutting elements that can be readily attached and detached from a main body portion without any preliminary alignment steps. The main body portion of the power tool includes a selectively actuatable motor including a rotary output and a rotary drive element including a resiliently biased drive pin. Blade carrier assemblies are capable of being selectively and removably attached to the main body portion and each include a moveable blade portion having a drive pin slot. Upon attaching a blade carrier assembly to the main body portion and actuating the motor, the resiliently biased drive pin is rotatable to a position such that the drive pin is resiliently forced into the drive pin slot of the working piece to actuate the working assembly.

Abstract: A method of minimally invasive unicompartmental knee replacement includes accessing a knee through a minimal incision, forming a planar surface along a tibial plateau of the knee, forming a planar posterior surface along a posterior aspect of the corresponding femoral condyle, resurfacing a distal aspect of the femoral condyle to form a resurfaced area having a curved portion, implanting a prosthetic tibial component on the planar surface along the tibial plateau and implanting a prosthetic femoral component on the prepared surface of the femoral condyle formed by the planar posterior surface and the resurfaced area. The curved portion of the resurfaced area has an anterior-posterior curvature corresponding to a fixation surface of the prosthetic femoral component. Prior to implantation, the femur and tibia are prepared to receive fixation structure of the femoral and tibial components.

Abstract: Instrumentation for surgically resurfacing a femoral condyle to receive a prosthetic femoral component in minimally invasive unicompartmental knee replacement surgery. The instrumentation includes a resurfacing guide for attachment to a femur and a rail member externally delineating an area of a femoral condyle of the femur that is to be surgically resurfaced to receive a prosthetic femoral component. The resurfacing guide has an abutment wall. The instrumentation includes a resurfacing instrument having a tissue removing surface for removing anatomical tissue from the delineated area of the femoral condyle, the tissue removing surface being movable along the delineated area to remove anatomical tissue therefrom. The resurfacing instrument has a engagement wall for contacting the abutment wall to limit the depth to which anatomical tissue is removed.

Abstract: Instrumentation for use in minimally invasive unicompartmental knee replacement includes a tibial cutting guide for establishing a planar surface along a tibial plateau and a tibial stylus having an anatomic contour for controlling the depth of the planar surface along the tibial plateau. The instrumentation further comprises a posterior resection block for preparing a posterior femoral resection, with a forward portion of the posterior resection block having a configuration corresponding to the configuration of a prosthetic femoral component. Instrumentation comprising a resection block and a resurfacing guide are provided for surgically preparing a femoral condyle to receive a prosthetic femoral component. The instrumentation further includes a resurfacing guide and a resurfacing instrument for resurfacing a femoral condyle to a controlled depth. Instrumentation is provided for intramedullary alignment of femoral instruments.

Abstract: A flow control valve has a fixed orifice adjacent to a movable orifice. The fixed orifice is secured to a cage that is in turn secured to a bonnet. This allows the fixed and movable disc to be simply installed and removed from the body through the bonnet. The stem assembly features a forked member for a strong grip of the movable disc. The design removes the need for precision machining bores in the body and facilitates assembly or removal of the valve internals.

Abstract: A utility vacuum that may be configured to employ a disposable bag or removable and reusable container for the collection of dirt and debris that are drawn into the utility vacuum. The utility vacuum may employ one or more movable legs that are movable between an extended position, which provides relatively stable operation of the utility vacuum, and a retracted position, which reduces the footprint of the utility vacuum so that it is easier to store.

Abstract: Instrumentation for use in minimally invasive unicompartmental knee replacement includes a tibial cutting guide for establishing a planar surface along a tibial plateau and a tibial stylus having an anatomic contour for controlling the depth of the planar surface along the tibial plateau. The instrumentation further comprises a posterior resection block for preparing a posterior femoral resection, with a forward portion of the posterior resection block having a configuration corresponding to the configuration of a prosthetic femoral component. Instrumentation comprising a resection block and a resurfacing guide are provided for surgically preparing a femoral condyle to receive a prosthetic femoral component. The instrumentation further includes a resurfacing guide and a resurfacing instrument for resurfacing a femoral condyle to a controlled depth. Instrumentation is provided for intramedullary alignment of femoral instruments.

Abstract: A method of minimally invasive unicompartmental knee replacement includes accessing a knee through a minimal incision, forming a planar surface along a tibial plateau of the knee, forming a planar posterior surface along a posterior aspect of the corresponding femoral condyle, resurfacing a distal aspect of the femoral condyle to form a resurfaced area having a curved portion, implanting a prosthetic tibial component on the planar surface along the tibial plateau and implanting a prosthetic femoral component on the prepared surface of the femoral condyle formed by the planar posterior surface and the resurfaced area. The curved portion of the resurfaced area has an anterior-posterior curvature corresponding to a fixation surface of the prosthetic femoral component. Prior to implantation, the femur and tibia are prepared to receive fixation structure of the femoral and tibial components.

Abstract: A knee joint prosthesis comprises a femoral component for implantation on a prepared femoral condyle of a knee and a tibial component for implantation on a prepared corresponding tibial plateau of the knee. The femoral component has a femoral articular surface cooperable with a tibial articular surface of the tibial component to permit motion at the knee. The femoral articular surface has a medial-lateral radius of curvature, and the tibial articular surface has a medial-lateral radius of curvature 0.25 to 5.00 mm longer than the medial-lateral radius of curvature of the femoral articular surface. The tibial articular surface has a medial-lateral mid-point, and the femoral articular surface defines a tracking line for the femoral component which tracks in an anterior-posterior direction along the medial-lateral mid-point as the knee moves between extension and flexion. The tracking line tracks at a medial-lateral angle relative to the medial-lateral mid-point of the tibial articular surface.

Abstract: An electrically powered lawn edger (10) having a wire wheel (26) specifically adapted for edging and trench cutting applications. The wire wheel includes pairs of twisted wire brush segments (34) which are held within a hub (32) of the wire wheel. The pairs of brush segments are spaced apart radially around a peripheral edge of the hub to produce evenly spaced gaps (36). The gaps help to prevent the edger from “loading up” with dirt and/or turf when edging or cutting a trench and possibly stalling the edger motor (21). A washer (40) having a key shaped boss (44) keys the wire wheel to an output spindle (21a) of the motor to prevent slippage of the wire wheel.

Abstract: A lawn edger includes an edge guide movable between a curb-edging mode and a trench mode. A lever is connected to the edge guide and extends through an aperture of a blade guard that is positioned to cover at least a portion of the cutting blade. The lever is positionable to move the edge guide between the curb-edging mode and the trench mode. When the edge guide is in the trench mode, the lever moves from a retracted position into an extended position, thereby providing a visual directional to the user.