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Science, like art, is not a copy of
nature but a re-creation of her.
Jacob Bronowski, (1956)
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Problem Solution
Electrocutaneous feedback system for patients with neuropathy
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Jan Walter Schroeder - (Ph. D. researcher)
Prof. Dr. Venky Dubey - (Assoc. Prof)
Prof Dr. Tamas Hickish MD
(Consultant in Medical Oncology)
Prof. Dr. Jonathan Cole MD
(Consultant, Clinical Neurophysiology)
Prof. Dr. Ian Swain
(Director of Clinical Science and Engineering)
Dr. David Kerr MD
(Consultant Physician)
Team
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Peripheral Neuropathy caused by
- Genetic diseases
- Metabolic/Endocrine (Diabetes)
- Chemotherapy
leads to
- Numbness
- Sensation loss
- Tissue damage and amputations
Background
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Problem
- Balance problems
- Restrictions in activities of daily life
- Tissue damage
Absence of force feedback leads to
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Solution
- Balance problems
- Restrictions in activities of daily life
- Tissue damage
Absence of force feedback leads to
- Force feedback system
- Vibration alarm for
critical time of pressure
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Sensation of touch – Artificial creation
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Skin resistance
Sensing Thresholds
Sensor drift
Sensor inaccuracy
Time of critical pressure
Challenges
Engineering
Physiology
Sensor placement
Smart device
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0
20
40
60
80
100
120
140
160
00.
91.
82.
73.
64.
55.
46.
37.
28.
1 99.
910
.811
.712
.613
.514
.415
.316
.217
.1 1818
.9
Time in sec
Pu
lse w
idth
in
µs
max PW: 160 µs
min PW: 40 µs
Pulse - Frequency: 50 Hz, Amplitude: 84 V
Start Pulse
Start
Start PWM Timer
Increment PW
Button
pressed
End
Decrement PW
Button
pressed
Define max. force
Button
pressed
yes
yes
no
no no
yes
Calibration routine
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0
100
200
300
400
500
600
1 2 3 4 5 6 7 8 9
Test person
Pu
lse w
idth
in
μs
Max PW Min PW
1.1788213.9203382.6743.733.113.145.383.386.33.57Ratio
44.0050583.22222699413110051261656647Min Pulse Width μs
156.6076311.2222184376488311160140558416168Max Pulse Width in μs
σμ987654321Test person
1.1788213.9203382.6743.733.113.145.383.386.33.57Ratio
44.0050583.22222699413110051261656647Min Pulse Width μs
156.6076311.2222184376488311160140558416168Max Pulse Width in μs
σμ987654321Test person
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Estimation of stimulation magnitude
9 healthy test subjects
2 experiment parts
25 attempts
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0
1
2
3
4
5
6
7
8
9
10
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
Series1
Series2
0
1
2
3
4
5
6
7
8
9
10
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
Series1
Series2
2.32
1.16
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0
1
2
3
4
5
6
7
8
9
10
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
Series1
Series2
1.48
0
1
2
3
4
5
6
7
8
9
10
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
Series1
Series2
0.48
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1.1210.921.440.81.320.481.481.161.48μAD
- 2 Part
1.62670.881.121.20.843.161.481.82.321.84μAD
- 1 Part
μ9
987654321Test person
1.1210.921.440.81.320.481.481.161.48μAD
- 2 Part
1.62670.881.121.20.843.161.481.82.321.84μAD
- 1 Part
μ9
987654321Test person
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Future
Clinical trial
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Alternative Scenarios
Artificial limb
Distance estimation
Brightness
Temperature
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Science, like art, is not a copy of
nature but a re-creation of her.
Jacob Bronowski, (1956)
I hope you found
that interesting.
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Sensation of touch - Nature
Neuron
Mechanoreceptors
Skin