Abstract: A compressor includes a cylinder assembly in a V4 configuration. A crankshaft of the compressor has a main shaft and first and second eccentric bodies. The two eccentric bodies drive four pistons.

Abstract: A wheelchair suspension is provided. The wheelchair suspension includes a frame, a pivot arm, a front caster, a drive assembly, and a rear caster. The pivot arm is pivotally coupled to the frame. The front caster is coupled to the pivot arm. Movement of the drive assembly in a first direction causes the pivot arm to substantially remain in a first position. Movement of the drive assembly in a second direction urges the pivot arm away from the first position.

Abstract: A wheelchair suspension is provided. The wheelchair suspension includes a frame, a pivot arm, a front caster, a drive assembly, and a rear caster. The pivot arm is pivotally coupled to the frame. The front caster is coupled to the pivot arm. Movement of the drive assembly in a first direction causes the pivot arm to substantially remain in a first position. Movement of the drive assembly in a second direction urges the pivot arm away from the first position.

Abstract: A wheelchair includes at least one side frame connected to a front caster assembly, and a cross-brace assembly. The cross-brace assembly includes a cross-brace member; at least one rear caster assembly connected to the cross-brace member; at least one main drive wheel axle tube fitting connected to the cross-brace member; and at least one arm connected to the cross-brace member. The at least one arm is pivotally connected to the at least one side frame through a pivot joint.

Abstract: A pair of bone attachment devices and a crosslink device for a spinal fixation system or other implant arrangement is provided that extends between and engages the bone attachment devices with engaging members. The bone attachment devices include a receiver portion and the crosslink device includes a pair of elongated bridging members each having a pivotally attached connector for connecting to the bone attachment devices at various planar elevations. An interconnection device situated between the connectors receives the members and allows translational and rotational adjustment of the members relative to one another.

Abstract: An apparatus comprises a pair of bone attachment devices and a crosslink device for a spinal fixation system or other implant arrangement. The bone attachment devices include a head with socket to receive a spinal rod or other elongate element and the crosslink device includes a pair of bridging members each having an end section for connecting with the bone attachment devices. An interconnection device situated between the bridging members receives the bridging members and allows translational and rotational freedom therebetween while being operable to secure the bridging members in position relative to one another. A pair of engaging members are structured to engage the head of the respective bone attachment device and bear against the respective adjacent end of crosslink device to lock the crosslink and the bone attachment device in a rigid construct are also included.

Abstract: A suspension for a vehicle is provided. The suspension includes, for example, a frame and a releasable locking assembly. The releasable locking assembly has, for example, a first assembly movably coupled to the frame, a second assembly movably coupled to the frame, and wherein movement of the frame relative to the first and second assemblies causes the first and second assemblies to engage each other to limit further movement of the frame in at least a first direction.

Abstract: Connection devices and methods to connect together vertebral rods. Embodiments of the device include a first member and a second member. Each member may include a grip for connecting with the vertebral rods. A connector may connect together the first and second members. The connector provides for various manners of adjusting the position of the extension members. Connector may provide for relative rotation of the members about one or more axes. Connector and the construction of the device may also provide for adjustment of a length of the device.

Abstract: A vertebral rod assembly comprises first and second members that may rotate about a first axis. Each of the first and second members includes a base and a vertebral support rod extending from the base. An extension extends from the base on the first member into an opening formed in the base of the second section. A fastener extends through the base of the second member to lock the first and second members, and to prevent the rotation of the first member and second member.

Abstract: The present invention provides a curb-climbing wheelchair having pivotal arm assemblies. The pivotal arm assemblies include at least one front caster and have the ability to rotate or pivot. The pivot arms rotate or pivot in response to moments generated by accelerating or decelerating the wheelchair thereby raising or lowering the front caster(s) through the rotational movement of the pivot arms. By raising or lowering the front caster(s) in such a manner, curb-like obstacles can be traversed in a low-impact manner.

Abstract: A home care oxygen system includes an inline compressor that has all the check valves and gas flow passages between cylinders located in the cylinder head. Only a single check valve is used for each cylinder. The crankshaft is built up from a shaft with eccentrics and spacers.

Abstract: A wheelchair suspension is provided. The wheelchair suspension includes a frame, a pivot arm, a front caster, a drive assembly, and a rear caster. The pivot arm is pivotally coupled to the frame. The front caster is coupled to the pivot arm. Movement of the drive assembly in a first direction causes the pivot arm to substantially remain in a first position. Movement of the drive assembly in a second direction urges the pivot arm away from the first position.

Abstract: A wheelchair suspension comprises a frame, at least one pivot arm, at least one front caster, at least one rear caster, a stabilizing system, and a sensor. The pivot arm is coupled to the frame. The front caster is coupled to the pivot arm. The rear caster is coupled to the frame. The stabilizing system is coupled to the frame and the pivot arm. The sensor is arranged such that movement of the frame relative to the rear castor causes actuation of the stabilizing system to at least partially resist further movement of the frame.

Abstract: Access to a greater area of surgical site with minimally invasive procedure is obtained by using two sets of sequentially placed tissue dilators oriented with their axes in a plane parallel to the spinal axis and a final non-circular dilator encompassing the two sets, followed by a non-circular tubular retractor providing a working channel extending longitudinally of the spine.

Abstract: A suspension for a vehicle is provided. The suspension includes, for example, a frame and a releasable locking assembly. The releasable locking assembly has, for example, a first assembly movably coupled to the frame, a second assembly movably coupled to the frame, and wherein movement of the frame relative to the first and second assemblies causes the first and second assemblies to engage each other to limit further movement of the frame in at least a first direction.

Abstract: A wheelchair includes at least one side frame connected to a front caster assembly, and a cross-brace assembly. The cross-brace assembly includes a cross-brace member; at least one rear caster assembly connected to the cross-brace member; at least one main drive wheel axle tube fitting connected to the cross-brace member; and at least one arm connected to the cross-brace member. The at least one arm is pivotally connected to the at least one side frame through a pivot joint.

Abstract: A mid drive scooter includes a frame that supports a seat for a rider of the scooter, a front wheel connected with the frame, left and right drive wheels, and left and right rear wheels. A left suspension is interposed between the frame and the left wheels, and a right suspension is interposed between the frame and the right wheels. The suspensions support the frame on the drive wheels for movement of the frame relative to the drive wheels in first and second degrees of freedom.

Abstract: The present invention provides a curb-climbing wheelchair having pivotal arm assemblies. The pivotal arm assemblies include at least one front caster and have the ability to rotate or pivot. The pivot arms rotate or pivot in response to moments generated by accelerating or decelerating the wheelchair thereby raising or lowering the front caster(s) through the rotational movement of the pivot arms. By raising or lowering the front caster(s) in such a manner, curb-like obstacles can be traversed in a low-impact manner.

Abstract: The present invention provides a curb-climbing wheelchair having pivotal arm assemblies. The pivotal arm assemblies include at least one front caster and have the ability to rotate or pivot. The pivot arms rotate or pivot in response to moments generated by accelerating or decelerating the wheelchair thereby raising or lowering the front caster(s) through the rotational movement of the pivot arms. By raising or lowering the front caster(s) in such a manner, curb-like obstacles can be traversed in a low-impact manner.

Abstract: The present invention provides a curb-climbing wheelchair having pivotal arm assemblies. The pivotal arm assemblies include at least one front caster and have the ability to rotate or pivot. The pivot arms rotate or pivot in response to moments generated by accelerating or decelerating the wheelchair thereby raising or lowering the front caster(s) through the rotational movement of the pivot arms. By raising or lowering the front caster(s) in such a manner, curb-like obstacles can be traversed in a low-impact manner.