Quantification of muscle tone
First Claim
1. A method for quantifying muscle tone patient comprising the steps of:
- moving the patient'"'"'s wrist in a non-sinusoidal and non ramp trajectory and determining the stiffness, viscosity and inertial parameters using the following relationship where τ
s is the total torque, τ
off is the offset torque, KH and BH are the angular stiffness and viscosity of the combined flexor and extensor muscle groups that act on the joint, JT is the combined inertia of the oscillating appendage, θ
is the angular displacement of the system, and
are the velocity and acceleration.
0 Assignments
0 Petitions
Accused Products
Abstract
A method and device for the quantification of muscle tone, particularly the wrist, wherein non-sinusoidal and non ramp trajectories are used to drive the wrist. Equation 1 is utilized determine the stiffness, viscosity and inertial parameters.
τs(t)=KHθ(t)+BHθ(t)+JTθ(t)+τoff [Eq. 1]
wherein where τs is the total torque, τoff is the offset torque, KH and BH are the angular stiffness and viscosity of the combined flexor and extensor muscle groups that act on the joint, JT is the combined inertia of the oscillating appendage, θ is the angular displacement of the system, and
are the velocity and acceleration. In accordance with the method, the trajectory θ(t) is controlled, the torque response τ(t) is measured and the stiffness, viscosity, and inertial parameters are determined using Equation 1. The method and device are particularly suitable for use on patients with spacisityf
14 Citations
12 Claims
-
1. A method for quantifying muscle tone patient comprising the steps of:
-
moving the patient'"'"'s wrist in a non-sinusoidal and non ramp trajectory and determining the stiffness, viscosity and inertial parameters using the following relationship where τ
s is the total torque, τ
off is the offset torque, KH and BH are the angular stiffness and viscosity of the combined flexor and extensor muscle groups that act on the joint, JT is the combined inertia of the oscillating appendage, θ
is the angular displacement of the system, and
are the velocity and acceleration.
-
-
2. A method of quantifying muscle tone in a patient comprising the steps of:
-
driving the patient'"'"'s wrist is in arbitrary trajectory that is neither sinusoidal nor ramp;
controlling the trajectory θ
(t);
measuring the torque response τ
(t); and
determining the stiffness KH, viscosity BH, and inertial JT parameters using the relationship wherein where τ
s is the total torque, τ
off is the offset torque, KH and BH are the angular stiffness and viscosity of the combined flexor and extensor muscle groups that act on the joint, JT is the combined inertia of the oscillating appendage, θ
is the angular displacement of the system, and
are the velocity and acceleration.
-
-
3. A device for quantifying muscle tone in a comprising:
an electromechanical system that drives the wrist of a patient with an arbitrary trajectory that is neither sinusoidal nor ramp, wherein the system includes;
a housing having a top surface;
a hand support on the top surface of the housing for holding the hand in a desired position;
an arm support on the top surface of the housing for holding the arm in a desired position relative to the hand;
a motor coupled to the hand support such that the motor moves back and fourth tracking the desired trajectory and wherein the motor causes the hand to move in the desired trajectory; and
an automated feedback controller for varying the torque, speed and direction of the motor. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12)
Specification