Functional electrical stimulation systems
First Claim
1. An apparatus, comprising:
- a sensor configured to produce a gait signal as a function of time, the gait signal associated with a force exerted by a lower limb of a patient; and
a processor configured to calculate a first threshold and a second threshold, the first threshold calculated based on a dynamic range of the gait signal, the first threshold associated with a first gait event, the second threshold calculated based on the dynamic range of the gait signal, the second threshold associated with a second gait event,the processor configured to produce a first signal when the gait signal crosses the first threshold, the processor configured to produce a second signal when the gait signal crosses the second threshold.
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Abstract
A gait modulation system including: (a) a sensor device including a sensor adapted for associating with at least one lower limb of the patient, the sensor for transducing at least one parameter related to a gait of the patient, so as to obtain gait data related to the gait, and (b) a muscle stimulator including: (i) an electrical stimulation circuit, the circuit adapted to supply an electrical stimulation output to an electrode array for performing functional electrical stimulation of at least one muscle of the lower limb, and (ii) a microprocessor, operatively connected to the at least one sensor, the microprocessor adapted for: receiving a stream of gait information based on the gait data; processing the gait information, and controlling the stimulation output based on the processing of the gait information, and wherein the microprocessor is further adapted to identify a failure in the stream of gait information, and to consequently control the electrical stimulation circuit to deliver a fail-safe stimulation output over a portion of a duration of the failure.
167 Citations
19 Claims
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1. An apparatus, comprising:
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a sensor configured to produce a gait signal as a function of time, the gait signal associated with a force exerted by a lower limb of a patient; and a processor configured to calculate a first threshold and a second threshold, the first threshold calculated based on a dynamic range of the gait signal, the first threshold associated with a first gait event, the second threshold calculated based on the dynamic range of the gait signal, the second threshold associated with a second gait event, the processor configured to produce a first signal when the gait signal crosses the first threshold, the processor configured to produce a second signal when the gait signal crosses the second threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus, comprising:
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a sensor configured to produce a gait signal as a function of time, the gait signal associated with a force exerted by a lower limb of a patient; and a processor configured to calculate, based on the gait signal, a first threshold and a second threshold, the first threshold associated with a first gait event, the second threshold associated with a second gait event, the processor configured to produce a first signal when the gait signal crosses the first threshold at a first time, the processor configured to produce a second signal at a second time, the second time occurring a predetermined time period after the first time. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. An apparatus, comprising:
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a sensor configured to produce a gait signal as a function of time, the gait signal associated movement of a lower limb of a patient, the gait signal including a plurality of maximums and a plurality of minimums; and a processor configured to calculate a dynamic range of the gait signal based at least in part on the plurality of maximums and the plurality of minimums, the processor configured to calculate, based on the dynamic range of the gait signal, a first threshold and a second threshold, the first threshold associated with a first gait event, the second threshold associated with a second gait event, the processor configured to produce a first signal when the gait signal crosses the first threshold at a first time, the processor configured to produce a second signal when the gate signal crosses the second threshold within a predetermined time period after the first time, the processor configured to produce a third signal when the gate signal does not cross the second threshold within the predetermined time period after the first time. - View Dependent Claims (17, 18, 19)
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Specification