A system and method of processing bone is disclosed. A tissue separator is utilized to separate tissue comprising at least one of muscle, periosteum and connective tissue from bone in a safe, sterile and efficient manner. In one aspect, the particle reducer can include an impeller positioned with respect to a cutting surface on a drum. At least one of the impeller and the drum is rotated by a power source such that harvested tissue frictionally engages the cutting surface. In another aspect, a source of pressurized fluid can be directed at tissue to separate bone from non-bone tissue.

A system and method of processing bone is disclosed. A tissue separator is utilized to separate tissue comprising at least one of muscle, periosteum and connective tissue from bone in a safe, sterile and efficient manner. In one aspect, the particle reducer can include an impeller positioned with respect to a cutting surface on a drum. At least one of the impeller and the drum is rotated by a power source such that harvested tissue frictionally engages the cutting surface. In another aspect, a source of pressurized fluid can be directed at tissue to separate bone from non-bone tissue.

The invention provides a counter-impact jet milling mechanism. The counter-impact jet milling mechanism comprises rotating members capable of rotating around an axis, and is characterized in that at least 4 circumferentially distributed grinding areas are arranged in the rotating members, a through path is formed between the outer edge of each of the grinding areas and the inner wall of each of the rotating members, and negative pressure blades, positive pressure blades and material diverters are arranged in each of the grinding areas. The invention further provides a counter-impact jet mill. The counter-impact jet mill comprises a motor, and is characterized in that the milling mechanism is coaxially installed on an output shaft of the motor, the milling mechanism is arranged in a shell, a feed port and a discharge port are respectively arranged on the shell, the feed port is communicated with the material inlet of the milling mechanism through a feed channel, and the discharge port is communicated with the material outlet of the milling mechanism through a discharge channel. The invention has the advantages of low energy consumption, conforming to environmental protection requirements, suitable for large-scale industrial production, and capable of producing fine powder to superfine powder having different requirements with no need for sectionalizers and induced draft fans.