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Evaluation of Dual Channel vs. Single Channel FES for Dropfoot

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT02494323
Recruitment Status : Completed
First Posted : July 10, 2015
Results First Posted : April 1, 2016
Last Update Posted : August 3, 2016
Loewenstein Hospital
Information provided by (Responsible Party):
Bioness Neuromodulation

Brief Summary:
Seventy (70) subjects put on the Ness L300 System, a FES device for ankle dorsiflexion for patients with foot drop. Stimulation will be given through two different electrodes: the QFE which is a single channel stimulation, and the Segmented Electrode which is a dual channel electrode. The purpose of the dual channel stimulation is to enable a balanced dorsiflexion, with no inversion/eversion inclinations. Ankle elevation will be recorded both in a seated position and during gait. Subject preference will be recorded through BSW Questionnaire and Subjective Survey. Twenty first subjects will be stimulated with four different dual channel configurations. The configuration that shows to have an advantage over the others will continue to be evaluated on fifty additional subjects. Same procedure will be taken place, in addition ambulation tests will be performed.

Condition or disease Intervention/treatment Phase
Dropfoot Device: Functional Electrical Stimulation Not Applicable

Detailed Description:

Twenty subjects will be stimulated with a single channel electrode, the Quick Fit Electrode. The values of stimulation will be recorded, as well as ankle movement (balanced Dorsiflexion, inverted or everted Dorsiflexion). Subjects will fill up a Benefit, Satisfaction, Willingness to continue (BSW) form. Next, subjects will be fitted with a segmented Electrode that enables both single and dual channel. Four configurations of current will be compared during sitting position and during gait. The first configuration (A) is segmented electrode single channel stimulation, the second configuration (B) is two currents running in parallel. The first medial channel stimulates the deep branch of common peroneal nerve (dorsiflexion/inversion) and the second lateral current stimulates the superficial peroneal nerve (eversion). In the third configuration (C), channels run diagonally. The medial channel runs between the upper medial electrode and the lateral lower electrode (dorsiflexion/inversion). The lateral channel runs between the lateral upper electrode and the medial lower electrode (eversion). The forth configuration (D) includes a common lower electrode; when it is connected to the upper medial electrode it functions as a medial channel (dorsiflexion/inversion); when it is connected to the upper lateral electrode, it functions as the lateral channel (dorsiflexion/eversion). The subjects will be asked to answer 3 questions after trying each configuration. 1. Thinking of the current system you use, did this test system provide any difference in the way the stimulation feels compared to your existing system? Yes No/Cannot tell any difference. 2. Thinking of the current system you use, did this test system provide any difference in what you think of as the 'quality' of stimulation you are used to compared to your existing system? Yes No/Cannot tell any difference. 3. Thinking of the current system you use, did this test system provide any difference in your ability to walk compared to your existing system? Yes No/Cannot tell any difference After all three dual channel configurations have been tested, subjects will be asked Question 4: Thinking of the last three test systems you used today, which test system do you believe was best among the three? B, C or D Subjects will be asked to grade their satisfaction with the one dual channel system they believe is best using the Benefit, Satisfaction, Willingness to Continue (BSW) questionnaire.

After completing evaluation of the first twenty subjects, a re-evaluation of ten subjects will take place. The anode/cathode electrodes will be re-positioned so the cathodes will be located at the upper part of the cuff and the anodes will be located at the lower part of the cuff. This re-evaluation is needed, since in the first evaluation there was an inconsistency in the anode/cathode positioning in the right and left FES cuffs. Stimulation will be given while sitting and during 2 minutes walk. Ankle movement and stimulation intensity will be recorded and compared to the input received in the initial evaluation of the ten subjects.

Fifty additional subjects were recruited to evaluate the performence of the common anode configuration (configuration D) and compare it to the QFE. configuration D was chosen because it showed an advantage over the other dual channel configurations. Same procedure will take place in order to compare the performance of the Segmented Electrode (configuration D) and the QFE. In addition, ambulation tests will be performed: 2mwt and 10 meter walk test. Gait velocity achieved when using each electrode will be compared to each other and also compared to gait velocity achieved when walking with no stimulation.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 70 participants
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: The Evaluation of Dual Channel vs Single Channel FES for Dropfoot
Study Start Date : March 2015
Actual Primary Completion Date : June 2015
Actual Study Completion Date : January 2016

Arm Intervention/treatment
Experimental: Functional Electrical Stimulation
Dual channel stimulation of the peroneal nerve to improve dropfoot
Device: Functional Electrical Stimulation
Single channel and dual channel FES for balanced dorsiflexion for patients with dropfoot
Other Name: Segmented Electrode, Novus System

Primary Outcome Measures :
  1. Ankle Movement as Good as or Better With the Segmented Electrode as With the QFE [ Time Frame: 7 months ]
    Subjects were fitted with the L300 Cuff that houses the single channel QFE and then the modified cuff that houses the dual channel segmented electrode. Subjects were stimulated first sitting and then after optimal ankle elevation was achieved, they walked with the stimulation. The clinician documented ankle movement on a 5 point scale: 1-inverted dorsiflexion, 2-slightly inverted dorsiflexion, 3-neutral dorsiflexion,4- slightly everted dorsiflexion, 5- everted dorsiflexion. The clinician documented the number of subjects who achieved each movement with each electrode according to the 5 point scale.

Secondary Outcome Measures :
  1. Benefit Satisfaction Willingness to Continue (BSW) Questionnaire [ Time Frame: 7 months ]
    Number of subjects who benefited or not benefited from the dual channel electrode was counted, number of patients who were satisfied or not satisfied with the dual channel electrode was counted, number of subjects who were willing to continue or who were unwilling to continue with the dual channel electrode was counted

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 80 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:• Experienced user or a new user of Functional Electrical Stimulation devices

  • Upper motor neuron lesion.
  • Foot drop - toe drag during walking.
  • Lower limb spasticity- 0-4 according to the modified Ashworth scale.
  • Responsible mental state, able to follow multiple step directions.
  • Aged between 18 and 80 years old.
  • Available for participating in the study.
  • Able to understand and sign the informed consent form.
  • Able to walk independently or with an assistance device (e.g. cane, walker etc.) / spot guarding for at least 10 meters.
  • Ankle passive range of motion preserved between 10 degrees plantarflexion and 30 degrees dorsiflexion.

Exclusion Criteria:

  • • Subjects with a demand-type cardiac pacemaker, defibrillator or any electrical or metallic implant.

    • Cancerous lesion of lower limb, present or suspected.
    • Medical condition that prevents participation or would likely lead to inability to comply with the protocol [e.g.: congestive heart failure, patient receiving chemotherapy, uncontrolled epilepsy, etc.].
    • Skin lesion at the site of the stimulation electrodes.
    • Change in bone-joint structures of the lower limb, such as contractures or deformations; fracture or dislocation, which would be adversely affected by motion from the stimulation.
    • Pregnancy.
    • Diagnosis of major depression or psychotic disorder.
    • Participation in another investigation that may directly or indirectly affect the study results.
    • Unable to tolerate electrical stimulation.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT02494323

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Bioness Neuromodulations
Hod HAsharon, Israel
Sponsors and Collaborators
Bioness Neuromodulation
Loewenstein Hospital
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Study Director: Bella Kuchuk R&D Clinician

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Responsible Party: Bioness Neuromodulation Identifier: NCT02494323     History of Changes
Other Study ID Numbers: Segmented Electrodes
First Posted: July 10, 2015    Key Record Dates
Results First Posted: April 1, 2016
Last Update Posted: August 3, 2016
Last Verified: February 2015
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No

Keywords provided by Bioness Neuromodulation:
Dual Channel Functional Electrical Stimulation
dropfoot, balanced dorsiflexion