Abstract: A knee joint rehabilitation apparatus may include a support bar fixed to a height-adjustment bar, the support bar being configured to receive a knee joint posterior; a plurality of pads configured to removably mount to the support bar to adjust an effective outer diameter of the support bar; and a lower leg support connected to the height-adjustment bar, the lower leg support being mounted to the height-adjustment bar so as to allow for changes in an angular position between said lower leg support and said height-adjustment bar.

Abstract: A weapon system includes a rotatable part having a plurality of barrels arranged in an array, a drive motor connected to the rotatable part so as to drive the barrels in rotation, a static part positioned rearwardly of the rotatable part, a magazine positioned rearwardly of the static part, and an ammunition feed mechanism cooperative with projectiles in the magazine so as to move the projectiles from the magazine to a position adjacent to the end of the plurality of barrels. The static part has a plurality of combustion chambers communicating with the plurality of barrels and with the end of the plurality of barrels. The combustion chambers are adapted to ignite a gaseous fuel therein so as to drive a projectile outwardly through the barrels. A plurality of actuators are adapted to load the projectiles into the end of the plurality of barrels.

Abstract: A weapon has a barrel, a body connected to the barrel, a cylindrical part affixed to an internal cavity of the body, a magazine cooperative with the cylindrical part so as to dispense a projectile adjacent a front chamber of the cylindrical part, a receiver positioned in the front chamber of the cylindrical part, an actuator cooperative with the receiver, and a trigger cooperative at the front chamber of the cylindrical part so as to ignite oxyhydrogen gas in the front chamber in order to file the projectile through the barrel. The magazine has an oxyhydrogen tank in an interior thereof. The oxyhydrogen tank being in communication with the front chamber and the rear chamber of the cylindrical part. The receiver is adapted to receive a bullet therein. There actuator is adapted to move the receiver in order to chamber the projectile.