Prosthetic devices and methods of controlling the same are provided. A prosthetic ankle device includes a foot unit and lower limb member moveable relative to one another and defining an ankle angle therebetween. The prosthetic ankle device further includes a controller to operate the device using different ankle angles depending on, for example, a user's gait speed. Methods of controlling the prosthetic ankle device include operating the device at different ankle angles depending on gait speed. For example, the prosthetic ankle device can provide for relatively more dorsiflexion at relatively slower gait speeds and relatively more plantarflexion at relatively faster gait speeds.

Prosthetic devices and methods of controlling the same are provided. A prosthetic ankle device includes a foot unit and lower limb member moveable relative to one another and defining an ankle angle therebetween. The prosthetic ankle device further includes a controller to operate the device using different ankle angles depending on, for example, a user's gait speed. Methods of controlling the prosthetic ankle device include operating the device at different ankle angles depending on gait speed. For example, the prosthetic ankle device can provide for relatively more dorsiflexion at relatively slower gait speeds and relatively more plantarflexion at relatively faster gait speeds.

The present invention mainly relates to knee joint and more particularly to the polymeric composite or nanocomposites based polycentric knee joint. In one embodiment the knee joint comprising: a top part having a top face and a bottom face, wherein the top face having an adapter coupled firmly with the top part to transfer the load from the stump of amputee via socket, a bottom part having a top face and a bottom face, at least one middle linkage pivotably coupling a middle posterior region of the top part with a middle posterior region of the bottom part, at least two side identical linkage pivotably coupling a sides of the top part with a sides of the bottom part, a compression spring along with cylindrical rod positioned in the interior of the bottom part which provides the engaging and disengaging of the top and bottom part, at least two extension spring couples the top and bottom part through two tiny holes and through simple supported beam in the top and bottom part for the flexion and extension of the knee joint and a bumper positioned in the base of the bottom part which contacts with the pylon to absorb the vibration and the terminal impact during the hip hike.

A prosthetic knee joint with buffering and braking effects has an upper connecting base, a linking assembly, a braking assembly, and a lower connecting base. The upper connecting base has two extending lugs and an accommodating recess. The linking assembly has two linking arms respectively and pivotally connected to the upper connecting base. The braking assembly has a braking arm protruding into the accommodating recess of the upper connecting base and pivotally connected to the two extending lugs. The lower connecting base is connected to the linking assembly and the braking assembly. The upper connecting base, the linking assembly, the braking assembly and the lower connecting base form a four-bar linkage. A cushion between an abutter and a main body provides a buffering effect during walking. Thus, the prosthetic knee joint has simplified structure and reduced cost and is convenient in assembly and use.

A motorized prosthetic device includes a joint member, a limb member, a pressure sensor, and a kinematic sensor. The pressure sensor indicates interaction between the motorized prosthetic device and the ground and the kinematic sensor measures torque at the joint member. A controller receives data from the pressure sensor and kinematic sensor and calculates a control signal based at least on the received data. An electrical motor receives the control signal and operates an actuator in accordance with the received control signal.

A mechanism has four connected links to mimic the motion of a knee joint. A lower link is oriented towards the vertical. A leverage ratio between flexion of the knee and relative angular displacement of certain links in the mechanism remains fairly steady over much of the range of motion of the mechanism. The mechanism may be used to drive an energy harvesting gearbox with steadier and more efficient energy harvesting at deep flexion, as well as with quieter operation.

A prosthetic device has a movable body and foot member with an end effector for contacting an external surface. A base body is coupled to a first joint of the foot member. A compliant linking member is disposed between a second joint of the foot member and a first joint of the moveable body. The compliant linking member can be a spring or flexible beam. A passive linking member is coupled between a third joint of the foot member and a third joint of the moveable body. An actuator is disposed between the base body and the second joint of the movable body. The actuator can be a motor with an extension member. The compliant linking member extends during roll-over phase. The actuator acts to assist with the extension of the compliant linking member during roll-over phase to aid with push-off phase in the gait cycle.

A prosthetic joint comprising: a proximal part having a proximal side, a distal side opposed to the proximal side, and a mounting point on the proximal side configured to connect to a proximal prosthetic limb part, a distal part configured to connect to a distal prosthetic limb part, a polycentric linkage mechanism connected to the proximal and distal parts and arranged to rotate the distal part from an extended position, where the distal part is disposed on the distal side of the proximal part, to a flexed position, where at least a portion of the distal part is disposed on the proximal side of the proximal part. The distal part is arranged to rotate relative to the proximal part about an instantaneous axis of rotation, the axis of rotation defining a medial-lateral axis of the proximal part. The linkage mechanism comprises a first linkage and a further pair of linkages, each of which are pivotally connected to the proximal and distal parts via respective connection points. The position of the instantaneous axis of rotation is determined by the location of the connection points of the first linkage and the further pair of linkages. The connection points of the first linkage are spaced from a mid-plane of the proximal part by a smaller distance along the medial-lateral axis than the connection points of the pair of linkages. The distal part is spaced from the proximal part in the direction of flexion as the distal part is rotated between the extended position and the flexed position. In the extended position, the connection points of the first linkage are spaced from the mounting point by a smaller distance in the direction of flexion than the connection points of the pair of linkages.

A posture calculator that calculates the posture of a moving object based on a first hypercomplex number derived based on a detection result from an angular velocity sensor for detecting an angular velocity of the moving object and a second hypercomplex number that is derived based on a detection result from an angle sensor for detecting an angle of the moving object and that has the same number of terms as that of the first hypercomplex number.

A prosthetic knee is equipped with a lock-mode selection assembly that includes a locking member designed to restrict the rotation of the prosthetic knee at the pivot joint. The locking member is operable through both a manual lock mode selector and a remote locking mechanism. The prosthetic knee incorporates a compressible link assembly that facilitates adjustable stance flexion. The assembly features an adjustment fastener that allows for the modification of the distance over which a spring stack may be compressed.