1. Functional Seating Design for Lumbar Puncture Procedure Team: Amanda Feest, Chelsea Wanta, Lee Linstroth, Malini Soundarrajan BME 200/300 October 20, 2006 Client: Cynthia M. Carlsson, M.D./M.S. UW Medical School Advisor: Kristyn Masters, Professor, Ph.D. UW College of Engineering

2. Overview Problem Statement Background Design Requirements Proposed Designs Design Matrix Future Work Questions

3. Problem Statement To design a specialized support system to maximize patient comfort and spinal curvature during lumbar puncture procedures

4. Analyzes spinal fluid of people at risk for Alzheimer’s disease to study changes occurring in the brain Lumbar Puncture Basic Procedure Spinal fluid is collected by inserting a needle into lower back Collection is easier if the patient curves their back, opening up the space between the lumbar backbones Background http://apps.med.buffalo.edu/procedures/ lumbarpuncture.asp?p=13

5. Existing equipment Currently, there is no device specifically designed for this procedure In the past, massage chairs have been used but they do not maximize spinal curvature http://www.neurology.org/cgi/content/full/58/12/1859?cookietest=yes

6. Current Set-up Current Position Problems Uncomfortable Does not optimize spinal curvature

7. Design Requirements Proper positioning of the back Maximize patient comfort Must cost less than $500 to produce Needs to be adjustable for varying patient heights Must be able to be used in conjunction with a hospital bed Must be portable and fit in hospital rooms

8. Proposed Design #1 One Piece Unit Description Head rest, foot rest, arm rest attached to central support column All adjustable locking wheels for transportation 43“ Wheels 25”

9. Proposed Design #1 Pros Easy to transport Pieces will not get separated Equal weight distribution for better stability Cons Difficult to adjust for different leg lengths Many moving parts

10. Proposed Design #2 Two Piece Stand Alone Unit Description Separate foot rest and stand with head and arm support Adjustable heights for all components Stand with wheels Foot rest attaches to base

11. Proposed Design #2 Pros Adjustable for different leg lengths Provides optimal curvature of the spine Adjustable angle for foot rest Cons Transportation difficulties

12. Proposed Design #3 Two Piece Table – top Unit Description Separate height- adjustable foot rest Arm rest and head rest will attach to the bedside table currently in the rooms

13. Proposed Design #3 Pros Less expensive Utilizes existing equipment Smaller and easier to store Cons Not sturdy since the table does not have locking wheels Less air flow Difficult to transport Foot rest movement would be limited

14. Design Matrix One piece unit Two piece stand-alone unit Two piece table attachment Comfort (10)777 Stability (10)995 Curvature of Spine (10) 796 Ease of manufacturing (10) 597 Adjustability (10)793 Portability (5)533 Cost (5)445 Total (60)445036

15. Future Work Develop prototype Select and order materials Manufacture the device Test the prototype and make necessary adjustments

16. Questions?

17. References http://apps.med.buffalo.edu/procedures/lumb arpuncture.asp?p=13 http://apps.med.buffalo.edu/procedures/lumb arpuncture.asp?p=13 Cynthia M. Carlsson, M.D. M.S.