Problem
Overview:
As discussed by Tandon, Yang, and Baron [1], Psoriasis
is a skin condition that causes redness and irritation; a common treatment for
this is phototherapy. One major limitation of this type of therapy is that most
treatments are administered in a hospital. The goal of creating a wearable
light therapy system is to limit psoriasis patient’s time spent receiving treatment.
Light therapy is usually administered in a hospital or at home with a personal
phototherapy unit. This type of therapy is only successful when treatment is
consistent in many ways; therefore, the wavelength of light applied, light
intensity, ease of use (to promote consistent application), are paramount. The
goal of this project is to design a wearable light therapy system to provide
patients with flexibility and increase the quality of life for psoriasis
patients.
Design
Constraints:
The
current design for the wearable LED light for photodynamic therapy is a 5 cm by
5 cm grid composed of 90 LED’s arranged in a matrix of positive and negative
alternating conductive thread. This design must be able to flexibly fit on
patient’s arm or leg. The wearable LED light therapy design, must be foremost a
working therapy system in which patients are receive the same standard of
treatment as would be given in a normal hospital setting. Mechanisms to
dissipate heat as well as maintain the device’s battery lifespan are critical
points that are being explored for the final design.
Pre-Existing
Solution:
Pre-existing
phototherapy applications are standard hospital treatment, home phototherapy
units, and other wearable LED prototypes. Hospital therapy is time consuming
and costly [2]. Home phototherapy has alleviated some of the time burden places on
psoriasis patients, although home systems vary in prices depending on the size
and needs of the patient. Wearable phototherapy units are still in the
prototype stages of development but this design is intended to be simple and
cost effective.
Design Goals:
The goal of this design is to offer a portable light source so that photodynamic therapy may be implemented outside of the hospital setting. The portable light source must be battery operated and flexible. In order to do this, LEDs will be secured into a circuit matrix (such as the one seen below in Figure 1) using conductive thread and conductive epoxy. This matrix can be of various sizes and easily woven into different materials. This allows the light matrix to be made into a bandage wrap that can be worn by the patient during treatment.
Deliverables:
The deliverables of this project include creating a prototype LED matrix, testing the LED matrix, modifying the matrix, creating individual designs for specific areas and an initial design for implementation of bandages. To test the LED matrix, first the device will be turned on and any problems will be trouble-shot and dealt with accordingly. Once the matrix is running properly, the light and heat output of the LED matrix, along with the battery life output, will be measured. The matrix will be modified to the proper specifications of heat and light output. Once this is complete, designs will be drafted that will account for different shapes and sizes of treatment areas. Finally, the prototype will be attached to fabric and created into a portable bandage.
Project Schedule:
·
Week 1
o
The project was introduced and reviewed
o
Blogger account was setup to report progress
o
Pre-existing design solution was discussed
·
Week 2
o
Building materials were introduced
o
Supplies were organized and selected
o
For next
week: test supplies, work on LED matrix design and publish a design
proposal
·
Week 3
o
Finalize LED matrix design
o
Begin assembly of matrix
o
For next
week: order necessary parts for final circuit
·
Week 4
o
Complete assembly of LED matrix
o
Attach matrix to power circuit
o
For next
week: investigate measuring light and heat intensity
·
Week 5
o
Measure light and heat output of the LED matrix
o
Begin modifying circuit for variable intensity
o
For next
week: complete variable intensity modifications
·
Week 6
o
Measure light and heat intensity at multiple
power settings
o
Begin designing wearable assembly
o
For next
week: investigate LED heat dissipation
·
Week 7
o
Finalize wearable design incorporating potential
heat dissipation
o
Begin assembly of final wearable design
o
For next
week: order necessary parts for final wearable design
·
Week 8
o
Complete wearable design
o
Measure light and heat intensity of wearable
design
o
For next
week: begin working on final report and presentation
·
Week 9
o
Investigate possible improvements and next steps
for the design
o
Work on final report and presentation
o
For next
week: complete final report and presentation
·
Week 10:
o
Present design
o
Turn-in report
Projected Budget:
·
SMD Red 1206 Chip LED
o Part number: UT-652UR
o 100
needed
o $0.58
per unit
o 660nm
SMD LEDs for use in LED matrix
·
Conductive Sewing
Thread
o Part
number: 260151023534oz
o 1oz
hobby cone needed
o $34.95
o Conductive
thread for use in assembling led matrix
·
CircuitWorks
Conductive Epoxy
o Part
number: CW2400
o 7g
epoxy / 7g hardner
o $70
o Conductive
epoxy for attaching LEDs to the conductive thread
·
Resistor
o Standard
resistor
o Undetermined
size / quantity
o $1.09
o Current
limiting resistor for LED matrix
·
Elastic Bandage
o
Standard elastic bandage
o
http://www.walgreens.com/store/c/walgreens-ace-elastic-bandage-antimicrobial/ID=prod6002624-product
o
Undetermined size / quantity
o
$6.49
o
Bandage for mounting LED
matrix
Total projected budget: $170.53
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