Device to accurately measure leg length inequality

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United Arab Emirates University Faculty of
Engineering Mechanical Engineering Department
Graduation Project 1
Device to accurately measure leg length inequality
Student Name ID Yousef Saleh AL Hossani
199900411 Mohamed AL Motari
980710584 Omar AL Kathairi 199900433
Advisor Dr.Yousef Al Haik
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Content

• Back ground
• Introduction
• Objectives

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Content

• Engineering Design Process.
• Embodiment Design.
• Conclusion

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Background

• bones of the spine
• Atlas bone
• Chiropractors

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Background

• bones of the spine

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Background

• Atlas bone the first bone that spinal cord
  passes through

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Background

• Chiropractors is a branch of healthcare that
  interested in alignment the spine.

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Introduction

• Link between Engineering and Medicine.
• Leg length inequality.
• Effect of the leg length.
• Measure leg length inequality.

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Objectives

• Produce an manually , accurate and reliable
  device to measure total leg length inequality.
• The device should accommodate measurements.
• The device should have a mechanism to ensure
  setting/placing the patient at the central
  position.

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Objectives

• The device should have a mechanism to ensure
  about 5 lb of force on the lower leg.
• The device should be easy to use by chiropractors
  and physical therapists.
• The device should match with equipment used
  chiropractors clinics.

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Engineering Design Process

• Market Analysis and information Gathering.
• Establishing Functional Structure.
• Specification.
• Developing alternative devices.
• Embodiment Design.
• Cost analysis.

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CT Device Computerised Tomography (CT) is an
x-ray examination that allows detailed cross
sectional images of body areas.
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Leg Length Analyzer Device
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Integrated Anthropometric Device
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How the chiropractics clinic in UAE measuring leg
length inequality

• Equipment
• Table is about 18 inches above the ground .

• Centerline tape

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How the chiropractics clinic measuring leg length
inequality

• The patient should be placed at an equal distance
  from the line.
• The patient should remove any thing in this
  pocket.

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Continued

• Supine on the bed.
• The patient moving back on the bed.
• The patient foot should be at an equal distance
• The patient leg should be parallel.

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Control the foot

• The doctor should used his hand to control the
  patient foot.
• The doctor should be in front of the center-line
  of the table.
• The doctor should parallel to the end of the
  table.
• The doctor catch foot. Applying force (5 lb).

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Errors in patient placement

• The most common error is when patient put some
  things his pocket.
• Another error is set the head of the patient in
  uncomfortable position.

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• Function
• Why we study function analysis?
• In many cases engineering designers develop their
  own methods, usually based on their experience
  and current practices in their working
  environment.

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• Function
• Understand concept of design problem.
• Developing alternatives.

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 Produce to establish functional
structures1.      Express the overall
function.
Black Box
Black Box
Output measuring leg length
Input Patient
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2.Break down the overall function into
sub-functions. 3.Block diagram show the
interactions between sub-functions. 4.Draw the
system boundary.
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Morphological Chart
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Developing Alternatives Design

• First Alternative

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Second alternate
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Third Alternative
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Third alternativesMain feature for third
alternatives

• Apply 5 lb by using spring.
• Measuring by using Caliper.

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Modules of the device

• Module 1 the beds base.
• Module 2 the bed
• Module 3. sliding plates

1. Pillow 2. First bet foot 3. Handle 4. Bed 5.
Leather 6. Sliding house 7. Spring house 8.
Forcing plate
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Module 3

• sliding of sub-plates
• sub-sliding plates.
• housing.
• main sliding plate.
• applying force plate.
• adjustment plate.
• foot lifter.
• caliper
• sliding of main plate.
• 0.two constant force springs. And its bearings.
• 1. shaft.
• 2. release pin.

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• Structure
• The structure is of Aluminum
• The advantage for Aluminum
• Low density.
• Good corrosion resistance.
• Reasonable cost.
• Compared to steel it is 1/3 dense.
• Leather
• Two difference color imitation leather.

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Constant Force Springs

• Advantage
• It gives constant force not with deflection.

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Horizontal and Vertical Digital Scale Units

• Features - Resolution 0.01mm / 0.0005"- Large
  and clear LCD screen- Stainless steel- Manual
  power on/off, - Metric / Inch system interchange
  at any position, - Zero setting at any position,
  
• The cost 88

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How to use the device
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Sliding horizontal plate
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How the plate is moving
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Polling the springs
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Fixed Vertical Plate
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Adjustment the plate
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Relase the pin
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Appling the force
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Measure leg length different
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Cost
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Conclusion

• All objectives are fulfilled.
• A lot of market analysis was done to get initial
  idea.
• The device is match with chiropractics clinic.
• Chiropractors doctors can be measure the
  difference between two legs with this device.
• A constant force flat spring will be use to
  applying force.
• Special digital caliper will be use to measuring
  leg length.

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Conclusion

• Check the design safety.
• Check the manufacturability.
• Design for assembly.

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• THANK YOU