Swing phase control device
First Claim
1. In an artificial knee joint swing phase control device, said device comprisinga piston and cylinder arrangement having a piston movable within a cylinder,a first chamber in said piston and cylinder arrangement on one side of said piston,a second chamber in said piston and cylinder arrangement on the other side of said piston opposite to said first chamber,means including a first throttle means for providing a communication between said first and second chambers,a fluid reservoir,means including a second throttle means for providing a communication between said second chamber and said reservoir,means for closing said second throttle means when said piston reaches a predetermined speed to cause said second chamber to act as a pneumatic spring, said second chamber acting as a pneumatic spring causing the piston motion to reverse and be pushed outwardly with respect to said cylinder, andmeans for connection to an artificial knee joint.
2 Assignments
0 Petitions
Accused Products
Abstract
A swing phase control device for an artificial knee joint which is provided with different first and second throttle controls to permit more natural flexing and stretching of the knee joint.
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Citations
11 Claims
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1. In an artificial knee joint swing phase control device, said device comprising
a piston and cylinder arrangement having a piston movable within a cylinder, a first chamber in said piston and cylinder arrangement on one side of said piston, a second chamber in said piston and cylinder arrangement on the other side of said piston opposite to said first chamber, means including a first throttle means for providing a communication between said first and second chambers, a fluid reservoir, means including a second throttle means for providing a communication between said second chamber and said reservoir, means for closing said second throttle means when said piston reaches a predetermined speed to cause said second chamber to act as a pneumatic spring, said second chamber acting as a pneumatic spring causing the piston motion to reverse and be pushed outwardly with respect to said cylinder, and means for connection to an artificial knee joint.
Specification