Abstract: A portable device for slowing and disabling moving vehicles, which consists of a plurality of individual blocks carried on a portable mat. The blocks are coated with an adhesive that affixes the blocks to the tire treads of a vehicle rolling over the device. The weight of the blocks unbalances the vehicle tires and creates a severe vibration, which retards the vehicle speed without severely destabilizing the driver's control of the vehicle.

Abstract: The cast saws embodying this invention include an ergonomic egg shaped saw body and a spiral cut blade, which eliminates the exposed circular blade of conventional cast saws. The spiral cut blade extends from the bottom of the saw body. The spiral cut blade is driven by an electric DC drive motor, which is housed within the saw body along with batteries and other electronics and wiring. A blade shield is pivotally mounted to the saw body, which covers the spiral cut blade when not in use. The shield pivots upward against the saw body as the cast saw moves over and cuts the cast from the patient. A guide assembly extends from the bottom of the saw body, which includes a thin neck part and a flat foot plate. The foot plate acts as a guide, which travels between the patient's skin and the inside layer of gauze of the cast. The foot plate also ensures that the spiral cut blade never contacts the patient's skin.