Importance

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Abstract

The invention relates to an artificial knee joint comprising; an upper part (10) and a lower part (20) which are mounted on one another such that they can pivot about a pivot axis (12); a hydraulic resistance device (30) between the upper part (10) and the lower part (20), which resistance device provides resistance to a pivoting movement, the resistance device (30) having a switching valve (50) in a hydraulic line (37), the switching valve (50) having a valve body which can be displaced in a displacement direction and, in a first position, blocks or partially closes the hydraulic line (37) and, in a second position, releases the hydraulic line (37) and is designed or positioned in such a manner that a pressure force component acting on the valve body (55) perpendicularly to the displacement direction through the hydraulic fluid generates a holding force that counteracts a displacement of the valve body (55), wherein an actuator (60) for exerting a release force is associated with the valve body (55) and moves the valve body (55) from the first to the second position, characterized in that the actuator (60) is coupled to a control device (70) which is connected to a sensor for detecting state data and activates the actuator (60) on the basis of the state data, and the release force is set to be less than the holding force at a predefined pressure force.

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First Claim