final presentation patrick melton daniel escobar 4/26/11
TRANSCRIPT
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Device for Collecting Stress Images of Subtalar Joint
Final Presentation
Patrick MeltonDaniel Escobar
4/26/11
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Hindfoot Anatomy
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PurposeCreate a device that will apply stress to the subtalar joint for the best possible radiographic images to allow for accurate measurements and determine the stability of the joint.
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Cobey View
Reilingh, M., Beimers, L., Tuijthof, G., Stufkens, S., Maas, M., & van Dijk, C. (2010). Measuring hindfoot alignment radiographically: the long axial view is more reliable than the hindfoot alignment view. Skeletal Radiology, 39(11), 1103-1108.
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Long Axial Alignment View
Reilingh, M., Beimers, L., Tuijthof, G., Stufkens, S., Maas, M., & van Dijk, C. (2010). Measuring hindfoot alignment radiographically: the long axial view is more reliable than the hindfoot alignment view. Skeletal Radiology, 39(11), 1103-1108.
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Semester Recap•Research Phase•Literature Review•Similar devices•EndNote
•Design Phase•Modeling/Drawings•Size Calculations
•Analysis Phase•Finite Element Analysis•Optimization
Completed Tasks
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Final Design 30 degree plate
inclination with additional forefoot plate that rotates 15 degrees.
Sliding heelcup plate for various foot sizes.
Allows for footstraps to be placed in multiple areas.
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Final Design
Utilizes two bolts that act as columns to angulate the foot for optimal positioning of the subtalar joint.
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Dimensions - Bolts
Ø 1.125” UNF – 12 Hex Head bolt
15°
Ø 0.5” UNF – 20 Hex Head bolt
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Dimensions - Hinges
Shoulder screw - Ø ½”,3/8”–16 thread with matching nut.
Shoulder screw – Ø ¼”#10–24 thread with matching nut.
Hinge: Ø 1.0” OuterØ 0.5” Inner
Hinge: Ø 0.5” OuterØ 0.25” Inner
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Finite Element Analysis – Foot Plate
Max Displacement: .0618 in.
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Finite Element Analysis – Foot Plate
Max Stress: 2550 psi Safety Factor: 3.92
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Finite Element Analysis – Base Plate
Max Displacement: .0362 in.
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Finite Element Analysis – Base Plate
Max Stress: 1180 psi
Safety Factor: n = 8.47
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Finite Element Analysis – Forefoot Plate
Max Displacement: .0273 in.
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Finite Element Analysis – Forefoot Plate
Max Stress: 8970 psi
Safety Factor: n = 1.12
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Materials SelectionMost of the device will be
made from a radiolucent plastic called Delrin, manufactured by DuPont.Tensile strength – 400 ksiYield Strength – 10 ksiDensity – 1.42 g/cm3
Footstraps made from Nylon
Foam padding (Lux-R-Foam) on sliding plate, forefoot plate, and in heelcup.
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CostMaterials Dimensions Cost
Delrin Sheets (4) 12" x 24" x 1" $159 ea.
Delrin Rods 1 ¼" D $7.50/ft.
½" D $1.56/ft.*
¼" D $0.52/ft.**
Lux-R Foam Padding 82" x 36" x ¼" $5.99
Velcro Straps (4) 1" W x 8" L $3.47/ft.
Total Material Cost $675
Shipping $50
Labor Hourly Rate Total Labor
Design $30 60 hrs
Machinist $25 16 hrs
Total Labor Cost $2200
Grand Total $2925
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Questions?