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Updated Design Night Presentation
- 1. D.I.S.C. Decompressive Intervertebral Spine Chair Sponsored by Entrepreneur: Sheel Gardner Advised by Dr. James Iatridis, PhD
- 3. The Need Immediate : A) Sponsor presented with ruptured disc Broad Implications : 1) Total direct and indirect costs for treatments of LBP are estimated to be $100 billion annually in the U.S. 1 2) The lifetime prevalence of LBP in the United States is 60-80% 2 1 - Bigos SJ, Boyer OR, Braen GR. Acute Low Back Problems in Adults. Clinical Practice Guideline, Quick Reference Guide Number 14. Public Health Agency, Agency for Health Care Policy and Research. Rockville, Md: . Department of Health and Human Services;1994. 2 - http://www.ninds.nih.gov/disorders/backpain/detail_backpain.htm
- 5. Understanding the Spine: Basic Anatomy Healthy Spinal Unit Side View http://sobrien2000-ivil.tripod.com/sitebuildercontent/sitebuilderpictures/hs2fig1.gif
- 12. Demonstration: Final Design Concept
- 13. How it Works Weight compressing discs Reactant forces from chair
- 14. How it Works Friction Applied Force Applied Force Normal Force
- 15. After Deflation Friction and Normal Force Resultant Weight
- 23. Testing and Analysis Partial Deflation (5 second intervals) Load Reduction (lbs) Quantitative: Load Reduction on Lumbar Spine
- 24. Testing and Analysis Partial Deflation (5 second intervals) Comfort Level Qualitative: Comfort Levels Throughout Cycle
Editor's Notes
- Lifetime prevalence means that in some point of your life, you will experience LBP
- understanding the problem holistically, muscles, bones, nutrition, genetics, postures What’s out there? (patent searches)
- Point out the lumbar area Explain the side view of the spinal unit, which consists of a vertebra and a disc along with all of the associated muscles, tendons, nerves, etc. Nucleus is the shock-absorbing, gelatinous/spongy center of the disc that is enclosed by the annulus fibrosus, the outer membrane. The annulus consists of fibrous tissue that is oriented circumferentially and serves to contain the fluid like contents which is the nucleus. Degeneration causes low back pain whereas herniation causes sciatic pain, shooting pain into the legs.
- Lifestyle: if your lifestyle causes your discs to be under constant compression for most of the day, its difficult to create a negative pressure gradient that will nourish the disc. Therefore, this makes self-repair and health difficult if you are constantly making it difficult for the disc to be healthy. Discs are in compression while we’re awake They are avascular (no blood supply) At birth, 80% of disc is H 2 O, it must be well hydrated.
- Gaining traction: difficult in being effective while isolating No one will use a device that isn’t comfortable Cadaver lab illustrated to us the multiple layers of musculature that support the spine and keep it upright and protected. Any attempt to apply forces to the spine is typically compensated for by the muscles as they tighten. Thus we considered electrostimulation to deactivate the muscles, either that or heat to relax muscles. However, if muscles are conciously relaxed, they allow natural forces such as gravity to act on the spine.
- Describe the overall principle: horizontal forces hold subject while the seat cushion deflates in a progressive manner, isolating the lumbar spine, utilizing gravity to supply the force necessary for distraction. Stabilization, Muscle Strengthening, Electro-stimulation, Distraction, Axial unloading, Applied horizontal force
- The 1.5” is basically the distance between the iliac crest of the pelvis to the lowest floating rib. This distance was measured independently and then verified by anthropomorphic tables. Calculated the deflection on the lead screw and it’s essential negligible, more deflection would occur due to the play between the threads in the lead screw.
- Here it’s important to note how important the shape was: it has to be comfortable yet functional, properties of the thermoplast such that its remoldable, the thermoplast affords a certain flexibility, yet is quite stiff, basically creating orthotic splints, Stiffness design : designed so that the outer edges are more liable to deflection to account for a variety of body types, yet the central axis (that actually does the distraction) remains stiff and steady as if it were just a lead screw with a contour.
- Mention cushion came from wheelchair
- Describe the tests, also how qualitative tests were quantified, note that the results are by no means conclusive yet because the sample size our of subjects has been limited 40% unloading is 40% unloading overall, not 40% of the chair’s capability
- Describe the tests, also how qualitative tests were quantified, note that the results are by no means conclusive yet because the sample size our of subjects has been limited 40% unloading is 40% unloading overall, not 40% of the chair’s capability