Subsystem Build & Test
Table of Contents
Team Vision for Subsystem Level Build & Test Phase
Phase Action Items
- Re-scope the project
- Be able to demo all of the EMG sensors (2) and the Motion Sensors (2) working and logging data in MATLAB
- Have 1st 3D printed part and all CAD models done
- Confirm if we will be able to be to test on patients at Nazareth
- Finish IRB / Figure out if it needs to be completed
- Present Initial Testing
- EMG consistence - ER4
- Max Arm Motion - ER5
A table of the status of all tasks completed in this phase can be found here: Task Status
Test Results Summary
A link to a live document of the test plans can be found here: Test Plans
Note: There has been a change to the number of electrode/myoware sensors to be used for the final device. As well as a slight adjustment in electrode/myoware sensor placement. This change was decided in efforts to decrease number of electrodes used and to decrease risk of misplacement. We are now focusing on two main locations, the extensor muscles which are highlighted red and and the flexor muscles which are highlighted purple in Image 1 (left). Image 2(right) shows the experimental placement for our myoware sensors for the completing phases and completion of MSD II.
Image 1 (left) shows the initial myoware sensor placement. Image 2 (right) shows the new electrode/myoware sensor placement for data collection of activation of muscles group critical for this project.
Consistency EMG data collection. This was broken down into three separate objectives.
- Speed Trials
- Consistency between trials
- Consistency between individuals
- To get a “decent” beat to perform exercises in time with.
- Used a metronome app on a cell phone to set a variety of speeds to perform the exercises in time with. Three paces were chosen to test data collection at.
- 77 bpm was chosen as our slow pace.
- 87 bpm was chosen as our medium pace
- 97 bpm was chosen as our fast pace.
- We liked 87 bpm +/- 2 bpm. It was found to be a good medium as Subject 1 was very consistent with the movements from trial to trial.
- 77 bpm was too slow. I was finishing the motion before the metronome signaled and had to hold the end of the movements.
- 97 bpm. With this pace, most of the time by the time subject one got to the end of the movement the count had already signaled to did it again. This made data run really close together and it was preferred that there be some space between each movement.
CONSISTENCY BETWEEN TRIALS-
- To get a “decent” beat to perform exercises in time with. Have the same time points for a given movement between trials from a single individual.
- Now that we have a good time beat we need to determine is these movements and time beat can be repeated between trials. Will have the subject complete 4 trials of data collection for each movement. Within each trial the subject will be asked to complete a given movement 4 times in beat with the metronome. For example, when collecting extension data, the subject will extend their wrist upward and then come back to center 4 times within the time interval of 30 secs.
Image above shows flexion data collected in channel 1 from Subject 1 using the Powerlab and LabChart7 combo used for EMG collection throughout MSD I. Horizontal scale is the amplitude of the signal measured in mV and the vertical scale is time measured in seconds. Total data collection per trial was done in 30 seconds. Each trial consists of about 5-7 seconds of baseline data followed by 4 "flexion-back to center" movements all about 3-4 secs in length.
- Conclusion (s):
- Very consistent. The pace is good. The procedure is just about nailed.
CONSISTENCY BETWEEN INDIVIDUALS-
- Determine consistency between patients. Shooting for the same time frames in which the exercise are performed and ideally same amplitude scales. (since we are looking at frequency in the data collection to characterize a tremor having the same or close to the same amplitude scales is going to be important when comparing data)
- Perform the developed procedure for collecting EMG data on 2 people or volunteers, 2-3 times each.
The image above shows data collected during an extension trial from two different individuals, Subject 1 (bottom two channels) and Subject 2 (top two channels). Horizontal scale is the amplitude of the signal measured in mV and the vertical scale is time measured in seconds. Total data collection per trial was done in 30 seconds. Each trial consists of about 5-7 seconds of baseline data followed by 4 "extension-back to center" movements all about 3-4 secs in length.
- Conclusion (s)
- The data matches up well (time scale wise, obviously the data will not be exactly the same). We should try this with one or two more people in our group at least just to be safe, but we are fairly confident that the procedure is nailed.
Live document for EMG Testing can be found using this link: EMG Testing
Risk and Problem Tracking
- Risk Management document is found here: Risk Management
- Problem tracking document is found here: Problem tracking.
Functional Demo MaterialsHere is a link for our presentation
Hardware and Software Flowcharts
Matlab source code is available here if other teams want to use it to test.
Plans for next phaseP18043 Project Planer has plans for the next phase going forward.
Individual 3-Week Plans: