Electromyography with prosthetic or orthotic devices
First Claim
1. A system for controlling a prosthetic or orthotic device (POD), the system comprising:
- a first limb member;
a second limb member coupled to the first member, the first limb member and the second limb member forming a joint having a neutral position that is used throughout a gait cycle to adjust a joint angle between the first limb member and the second limb member;
at least one first sensor configured to measure electromyography (EMG) signals from a first muscle over a period of time;
a controller configured to receive a first EMG signal from the at least one first sensor and to determine an adjusted neutral position based at least in part on the first EMG signal; and
at least one actuator communicatively coupled to the controller, the at least one actuator configured to actuate the first limb member with respect to the second limb member such that the adjusted neutral position is used throughout the gait cycle to adjust the joint angle between the first limb member and the second limb member.
1 Assignment
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Accused Products
Abstract
Systems, devices and methods for control of a prosthetic or orthotic device (POD) based on electromyography (EMG) signals are described. The POD may be a lower or upper limb POD having one or more joints. One or more EMG sensors may detect the EMG signals. The EMG sensors may be external, subcutaneous, intraperitoneal, epimysial, intramuscular, or other types. Control of the POD may be based on EMG and non-EMG signals, such as velocity, acceleration, position, force, etc. Voluntary and/or automatic control may be implemented, for example with voluntary muscle contractions and/or data based on velocity, acceleration, position, force, etc. In some embodiments, the neutral position of an ankle POD is adjusted based on EMG signals.
74 Citations
26 Claims
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1. A system for controlling a prosthetic or orthotic device (POD), the system comprising:
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a first limb member; a second limb member coupled to the first member, the first limb member and the second limb member forming a joint having a neutral position that is used throughout a gait cycle to adjust a joint angle between the first limb member and the second limb member; at least one first sensor configured to measure electromyography (EMG) signals from a first muscle over a period of time; a controller configured to receive a first EMG signal from the at least one first sensor and to determine an adjusted neutral position based at least in part on the first EMG signal; and at least one actuator communicatively coupled to the controller, the at least one actuator configured to actuate the first limb member with respect to the second limb member such that the adjusted neutral position is used throughout the gait cycle to adjust the joint angle between the first limb member and the second limb member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A system for controlling a prosthetic or orthotic device (POD), the system comprising:
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a first limb member; a second limb member coupled to the first member, the first limb member and the second limb member forming a joint having a neutral position that is used throughout a gait cycle to adjust a joint angle between the first limb member and the second limb member; at least one sensor configured to measure electromyography (EMG) signals associated with a muscle over a period of time; a controller configured to receive the EMG signal and to determine an adjusted neutral position based at least in part on at least the EMG signal and to select a control mode for POD motion from a plurality of control modes based at least in part on at least the EMG signal; and at least one actuator communicatively coupled to the controller, the at least one actuator configured to actuate the POD based at least in part on the control mode for POD motion and to actuate the first limb member with respect to the second limb member such that the adjusted neutral position is used throughout the gait cycle to adjust the joint angle between the first limb member and the second limb member. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. A system for controlling a prosthetic or orthotic device (POD) including a first limb member and a second limb member forming an ankle joint having a neutral position that is used throughout a gait cycle to adjust an ankle joint angle, the system comprising:
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at least one first sensor configured to be implanted in a muscle and to measure myoelectric signals from the muscle over a period of time and to transmit an electromyography (EMG) signal generated at least in part from the measured myoelectric signals from the muscle; at least one second sensor configured to measure at least one of acceleration, angle, force, and velocity over the period of time and to transmit an information signal generated at least in part from the at least one of acceleration, angle, force, and velocity; a controller configured to; receive the EMG signal and the information signal, based at least in part on a determination that the EMG signal does not satisfy an EMG signal threshold, generate a control signal according to a first control scheme, wherein the first control scheme is based at least in part on the information signal, based at least in part on a determination that the EMG signal satisfies the EMG threshold, generate the control signal according to a second control scheme, wherein the second control scheme is based at least in part on the information signal and the EMG signal, and determine an adjusted neutral position of the ankle joint based at least in part on the EMG signal; and at least one actuator coupled to the controller, the at least one actuator configured to actuate the POD based at least in part on the control signal and on the adjusted neutral angle. - View Dependent Claims (24, 25, 26)
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Specification