OandP 13

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  1. Leather
    • Ex: : shoes, cover metal components, supportive components
    • Pro: Can make porous or stretch or stiffen
    • Cons: Heavy, archaic
  2. Steel
    • types: carbon steel, low alloy and high alloy steel, stainless steel
    • Pro: strength, rigidity, many of the uprights, durable, can heat and bend it
    • Cons: high density, susceptible to corrosion
  3. Aluminum
    • Cast Aluminum
    • Ex: Prefab prosthetic components
    • ----Stiffen toe for gait cycle
    • Wrought AL
    • Ex: Pylons, Uprights, UE devices
    • ----Pylon is the shaft
    • ----Uprights are the sides
  4. Titanium
    • Pros: stronger than Al, comparable to steel, resistant to corrosion
    • Cons: expensive
  5. Magnesium
    • Corrosion resistant, lighter than titanium and aluminum
    • Not used often
  6. Wood
    Ex: prosthetic foot (Keel, SACH) or knee units
  7. Plastics
    • Thermoplastics
    • Thermosetting Materials
  8. Low temp vs. High temp
    • Low temp, can heat right onto the pt, but not as durable as high temp
    • Ex: resting hand splint
    • Ex: high temp: LE
  9. Polypropylene
    • Ex: hinge joints, spring assist, prefab AFO, prosthetic sockets, pelvic bands
    • Many AFOs we see
  10. THERMOSETTING MATERIALS
    • • plastics applied over positive model
    • • common resins: acrylic polyester and epoxy
  11. FOAMED PLASTICS
    • Protective interface; microcell structure
    • Next to skin
    • Compress over time so have to be replaced
    • Disperses pressure
  12. FORCES IN ORTHOTICS DESIGN
    • spread forces/ pressure of distance and increase lever arm to increase comfort
    • goal to maintain mechanical advantage 2:1-5:1, i.e. lever arm of applied force 2-5x longer than lever arm of applied resistance
  13. bending moment:
    • location of max orthotic control or correction
    • least deforming/most effective if central force and maximum bending moment coincide/congruent with actual joint axis
  14. TYPES OF CONTROL SYSTEMS
    • 1. First class lever system
    • ----Forces equal 0
    • ----Two arrows pointing left on first model
    • 2. Balanced parallel force system
    • ----Controlled jt motion
    • 3. 3 point loading or control system
    • ----2 forces
    • --------one proximal and one distal that counter act the primary force (MCL stability) ← second picture
    • ----used most often in orthoses
    • 4. Balanced 4 point system
    • ----control rotation/ translation
    • ----use bands
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ID
320861
Card Set
OandP 13
Description
OandP 13
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