Abstract: A slip ring assembly has an inner ring having an inner ring peripheral wall, an outer wall having an outer ring peripheral wall, and a contact ring having at least one conductive surface positioned between the inner ring and the outer ring. The inner ring has a first inner ring portion and a second inner ring portion that are attachable to each other to create the inner ring. The outer ring has a first outer ring portion and a second outer ring portion that are attachable to each other to create the outer ring. The contact ring has a brush assembly with at least one brush. The contact ring has a first contact ring portion and a second contact ring portion that are attachable to each other to create the contact ring.

Abstract: A multipressure cycling valve includes a top sub adapted to connect to a tubing string and a bottom sub adapted to connect to a toe port device; an outer valve housing connected to the top sub and the bottom sub; a rupture disc body comprising a rupture disc exposed to tubing string fluid pressure; a valve mechanism disposed between the valve housing and an annular valve sleeve, the valve mechanism comprising a plunger moveable from a closed position, to at least one intermediate closed position, to an open position, and an indexing mechanism which advances the plunger from the closed position to the at least one intermediate closed position by a first pressure event, and to the open position by a subsequent pressure event; a biasing means for urging the plunger towards its closed position; and wherein the valve defines a fluid communication path from the rupture disc body, through the plunger and the bottom sub to the toe port device, which fluid communication path is closed by a rupture disc and the plunger

Abstract: Sub-performing elements of an ultrasound transducer array are detected. The power, such as current, used by or provided to the transmit driver is measured. By driving each element or group of elements separately, defective elements or groups of elements are detected from the amount of power used.

Abstract: Sub-performing elements of an ultrasound transducer array are detected. The power, such as current, used by or provided to the transmit driver is measured. By driving each element or group of elements separately, defective elements or groups of elements are detected from the amount of power used.

Abstract: A method and apparatus for preparing a bone product are provided. The method includes contacting an interior section of a cylindrical bone portion with a high pressure fluid medium such as at least about 1000 psi to remove at least a portion of cancellous bone matrix from the bone portion. Preferably the bone contains less than about 25% by weight cancellous bone. The apparatus includes multiple stations of opposing high pressure nozzles holding the cylindrical bone portion from each end and for contacting the interior surfaces of a bone portion with a fluid medium. The apparatus also includes a third nozzle for contacting the exterior surface of the bone portion with a fluid medium.

Abstract: A method and apparatus for preparing a bone product are disclosed. The method includes contacting an interior section of a cylindrical bone portion with a high pressure fluid medium to remove at least a portion of cancellous bone matrix from the bone portion. The apparatus includes multiple stations of opposing high pressure nozzles holding the cylindrical bone portion from each end and for contacting the interior surfaces of a bone portion with a fluid medium. The apparatus also includes a third nozzle for contacting the exterior surface of the bone portion with a fluid medium.