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Multi S urface Sensing Ankle foot Orthotic

Multi S urface Sensing Ankle foot Orthotic. Put a slide here describing your overall project goals, and what you’re focusing on for this talk. Add a slide here with an overview of foot drop, and pictures of a couple of typical AFOs

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Multi S urface Sensing Ankle foot Orthotic

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  1. Multi Surface Sensing Ankle foot Orthotic

  2. Put a slide here describing your overall project goals, and what you’re focusing on for this talk

  3. Add a slide here with an overview of foot drop, and pictures of a couple of typical AFOs • Might not be a bad idea to show a typical ankle flexion plot through the gait cycle, along with Walking Stick Man

  4. Interviews at NAZ • 10 patients have been interviewed • All of them were stroke victims, with the exception of one with MS. • All of the patients were elderly, and lived with the assistance of a spouse or nurse. • All Patients had AFOs for more than 6 months

  5. Interviews at NAZ • Major Takeaways • Foot Drop has many other compound symptoms. • Rolling of the ankle • Clenching of the toes • Most AFOs are designed with level surface conditions in mind. • Patients complained about walking down stairs, and ramps • Patients complained about the weight of the AFO. • Patients also complained about the bulkiness of their braces. • These AFOs are the only things that lets these patients walk

  6. Interviews with Rochester Orthopedics Lab • Why the braces where bulky? • Rolling ankle, distribution of force • The supplier of numerous commercially available AFOs • Ossur • Becker • Dynamic Walk • Otto Bock • Allard • Tamarack • Most Commercially available AFOs are meant for patients with just Drop Foot Figure 1. Dynamic Walk Single

  7. Interview with Dr. Barbano • Patients at Rochester General are under 6 months • Still dealing with many other problems caused by the stroke • Most Patients are given a solid AFO before they are released • At the hospital it is not common to see these other kinds of braces • The patents are referred to other clinics in the area, to help them with physical therapy

  8. Defining the target patient and general needs • Should be based off of the patents observed at NAZ • They seem to be the patents that we will end up have to test it on • Should be well into the recovery after theirstroke • They should be able to supply feedback • Would not be a candidate for a commercially available AFO • Must use a kind of jointed brace • There gait could also be impaired by rolling of the ankle or toe curling Source: http://www.tamarackhti.com/joints/dorsiflexion.asp Figure 2. Tamarack joint

  9. Customer needs • Functionality • Lifts foot up at appropriate time • Sit to stand • Stairs • Inclined surface • level surface • Constraints • Fits into a shoe • Ease of access • Adjustability • Light Weight • Portable • Inexpensive • Able to be used on both sides of the body • Safety • Durability/fatigue life • Biocompatible surface • Able to be cleaned/sterilized

  10. Metrics

  11. Constraints

  12. Safety

  13. Functional block diagram

  14. Initial Design Components

  15. Initial Design Combinations Figure 3. Variable peek Rod Figure 4. Variable peek Rod Geo Fit

  16. Initial Design Matrix

  17. Adjustable Plantar Stop • Attaches to the back of existing AFO • Two individually adjustable back stops attached to rotating joint • Linear actuator offset to the side • It rotates the back stop in and out of position • But structurally isn't what is inevitably holding the foot Figure 5. Y rocker AFO

  18. Issues with design • It adds weight • Make the Brace Lighter • Attaching to the back of an existing AFO • Adhesive • Vacuum • Use existing backstop • Velcro • Actuation • Piezoelectric Linear actuator • Knowing the Ground • Accelerometer • IR Range Finder Figure 6. Shell Stopping AFO

  19. Carbon Fiber Brace • Breaks the project up into 2 areas • Bulk reduction in weight and size will help get patients excited about their brace • Spring properties of carbon fiber Figure 7. Carbon Fiber

  20. Steps to Carbon Fiber Brace • Working with Rochester Orthotics Lab • Using old molds • General facilities • Sitting in on Composites • Figure out how the carbon fiber will react • Build brace for project

  21. Piezoelectric Linear actuator • Small Light weight Linear actuators • 23g • 22 x 10 x 19 mm • Holding Force • 6.5N • Stall Force • 7N Figure 8. Piezoelectric Actuator Source: http://www.piezomotor.se/uploaded/LL1011_150010_00.pdf

  22. Accelerometers • Require a lot of data analysis • Drift in integration accuracy • Measuring many different things • Most of which I am uninterested in • Most of which is very noise

  23. IR Rang Finder • Initial Look into expected data Source: http://www.technologicalarts.com/myfiles/data/gp2d120.pdf Figure 9. Sharp IR sensors Figure 10. Sharp IR sensors Technical Drawing

  24. Level Ground

  25. Descending Stairs

  26. Distance Detected Level Ground vs. Descending Stairs

  27. Descending Ramp

  28. Distance Detected Level Ground vs. Descending Ramps Ramp

  29. Next Steps • Figure out how it is going to attach to the brace • Find Ramp Gait Data • Test out IR sensor • Define algorithm for determining floor surface • Model Design

  30. Questions?

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