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EXISTING OTOSCOPES

Figure 1. The cost of the Welch Allyn otoscope ranges from

$150-$350 (left) while Dr. Mom’s costs approximately $50 (right)

REQUIREMENTS

CONCLUSIONS

Inexpensive - The primary goal of this project is to design

a more affordable otoscope

Self-Contained Operation – The otoscope must be

operated without any external sources of electricity

Appropriate Lighting and Magnification – The

otoscope must provide adequate viewing of the tympanic

membrane so that otitis media can be properly diagnosed

Easily Sanitized - The otoscope must be easy to sanitize

and reuse so all patients may be safely examined

Durability - The long-term reliability of all components of

the otoscope must be considered Our LED otoscope can be used to effectively diagnose

otitis media, is more affordable than otoscopes available on

the market, and fulfills all of the customer requirements.

INTRODUCTION FINAL DESIGN CONCEPTUAL DESIGN

Background:

• Otitis media, also known as an ear infection, affects

11% of the population in some developing countries

• An otoscope is a medical device used to inspect and

diagnose otitis media

Problem Statement:

• Many developing countries have inconsistent power

supplies and insufficient medical funding to utilize and

afford an otoscope

Goal:

• To develop an LED-based, inexpensive, and self-

contained otoscope that can effectively diagnose otitis

media

Inexpensive LED-Based OtoscopeBrooks, Andrew; Chiu, Michael; Winnewisser, Scott

Advisor: Professor David Laiho Sponsor: Dr. Lily Laiho

CRANK-POWERED

MECHANISM

SPECULA

3-LED RING AND LENS

Figure 2. Final design of our otoscope

Figure 6. SolidWorks model of the otoscope

Figure 3. Acrylic LED ring with glass lensFigure 4. Crank-powered flashlight

Figure 5. Silicone mold (left) and polyurethane plastic specula (right)

• The 3-LED ring and 5x magnification glass lens

provide comparable brightness and viewing to Dr.

Mom’s otoscope

• Manufacturing Process:

• Laser-cut the ring from acrylic plastic

• Utilized a mill to cut angled holes for the LEDs

TEST RESULTS

Impact Resistance:

• Our otoscope frame remained intact after dropping

it ten times from 7 ft. above a concrete floor

Brightness:

• Our otoscope was charged for 15 seconds

• A lux meter was used to measure the brightness for

30 seconds

Visibility:

• Dr. Slishman verified that our otoscope can

adequately view the tympanic membrane

Cost: Table II. Total material cost

Device Brightness Range

Dr. Mom

(1 AA Battery)580-597 Lux

Our Otoscope

(Crank-Powered)543-614 Lux

Table I. Brightness Test Results

Component Cost

Crank-Mechanism $6.82

Lens $1.23

LED Ring $0.12

LEDs (3x) $0.66

Resistor $0.03

PVC Head/Body $0.13

Specula $0.07

TOTAL $9.06

The final design incorporates a polyvinyl chloride housing, crank-powered mechanism, LED ring, glass lens, and specula

• The specula allows for direct illumination

of the tympanic membrane

• The specula can easily be removed and

sanitized

• Manufacturing Process:

• Utilized rapid prototyping to create a

silicone mold

• Produced a specula using polyurethane

plastic

• With the crank-powered mechanism, the otoscope

is self-contained and independent of external

electricity

• Sufficient power for inspecting the eardrum

requires only 15 seconds or less of charging

• Manufacturing Process:

• Rewired the flashlight to power the LED ring