Abstract: The invention relates to transformers. More particularly, the invention relates to transformers using (preferably electrostatic and more preferably dielectric elastomer) transducers such as generators and actuators. The invention further provides a priming circuit therefor.

Abstract: A system and method is provided for determining the capacitance between electrodes of an artificial muscle or dielectric elastomer actuator (DEA). The method comprises measuring the voltage difference between the electrodes of the DEA, the first derivative of that voltage with respect to time, and the total instantaneous current through the DEA, then calculating the capacitance of the DEA as the difference between the total instantaneous current through the DEA and the product of the voltage between the electrodes and an error term, divided by the first derivative of the voltage between the electrodes with respect to time. The capacitance may then be used to derive estimates of the leakage current, charge upon the DEA, and/or the physical state of the DEA, thereby implementing self-sensing to allow closed-loop feedback control of DEA actuation.

Abstract: An array of actuators is provided which is adapted for sequential actuation by way of mechano-sensitivity propagating actuation through the array, triggering each actuator upon deformation thereof caused by an adjacent actuator or a load in the form of a fluid or a solid object. Actuation is thus coordinated with minimal computational overhead. Also provided is an actuator suitable for use in such an array, a method of controlling an actuator, and a method of controlling an array of mechano-sensitive actuators.

Abstract: Anatomical structures such as the musculoskeletal structure of a knee or hip joint, are modeled using a predictive cause-and-effect mathematical model wherein parameters and interactions associated with biological tissues are examined. The model extends over nested small scale parameters (e.g., genetic or cellular) up to macro scale parameters, e.g., body force and motion. The parameter values are populated for a subject or group, and the model is operated iteratively while subjecting the parameters to one or more influences, to project changes over a span of time that encompasses adaptive changes in tissues and also aging and wear.

Abstract: The invention provides an actuator for an electric motor and an electric motor including said actuator. The actuator includes one or more body formed from a dielectric elastomer, each body having at least one active region that is directly or indirectly coupled to a drive means. The active regions are arranged such that, in use, actuation thereof causes driven means to move with components in at least first and second directions, preferably within a plane of the body.

Abstract: A joint replacement prosthesis is disclosed. The prosthesis has a conical base and a hemispherical or part hemispherical top providing a hemispherical or part hemispherical replacement bearing surface. The prosthesis is shaped and sized to have a wedge fit in a conical recess formed in the head or neck of a human femur or humerus without removal of all of the neck of the femur or humerus.

Abstract: A joint replacement prosthesis is disclosed. The prosthesis has a conical base and a hemispherical or part hemispherical top providing a hemispherical or part hemispherical replacement bearing surface. The prosthesis is shaped and sized to have a wedge fit in a conical recess formed in the head or neck of a human femur or humerus without removal of all of the neck of the femur or humerus.