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Multi-Chamber Programmable Air Cushion (MC-PAC)

Multi-Chamber Programmable Air Cushion (MC-PAC). Joli-A Kabamba Masahiro Ohno Scott Paik Joe Suarez. The Pressure Ulcer Problem. Tissue damage caused by restricted blood flow, friction, and shear force Found on 12.3% of all hospitalized patients. 4% of patients die from it

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Multi-Chamber Programmable Air Cushion (MC-PAC)

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  1. Multi-Chamber Programmable Air Cushion (MC-PAC) Joli-A Kabamba Masahiro Ohno Scott Paik Joe Suarez

  2. The Pressure Ulcer Problem • Tissue damage caused by restricted blood flow, friction, and shear force • Found on 12.3% of all hospitalized patients. 4% of patients die from it • Prolonged hospital stay up to 5 times longer than patients without pressure sores Picture courtesy of the National Pressure Ulcer Advisory Panel (NPUAP)

  3. MC-PAC • Programmed system to control distribution of individual air cell pressure in the cushion • Based on suggestion from Shepherd Spinal Center to reduce occurrence of pressure ulcers on paraplegic patients in wheelchairs • Sponsored by Texas Instruments Analog University Design Competition • Expected price: $2,000.00

  4. Design Objectives • Provide automated means of pressure relief for wheelchair bound • Minimize risk of friction, shear force on skin • Maximize user comfort • Easy to use • Operate on 12V battery

  5. Technical Objectives • Maintain pressure in air cells at set levels • Remap contact pressure distribution on cushion periodically, as suggested by NPUAP • Use microcontroller to display status of each air chamber • Pressure configuration changeable by user via intuitive user interface (UI)

  6. MC-PAC Block Diagram Microcontroller (TI MSP-430) 5x5 Air Cells User Interface Cell Pressure Sensors 5x5 Air Valves Air Pump Signal Air Air Intake Air Release

  7. Pressure Regulation Algorithm Algorithm is programmed to maintain set pressure in individual air cells CHECK SENSOR (X,Y) DONE START LOW PRESS HI LOW OK PRESS? HI LOW OK DUMP SOME AIR DELAY DONE HI HI LOW OK OK ADVANCE (X,Y) COUNT

  8. Sequential Control

  9. Control Panel • User Interface consists of three switches and one knob • User can stop/switch cycle, or change cycle time • Control panel displays cell status Display Next Cycle Timer Power Hold

  10. Parts Acquired for Project Build Air Pump 5x5 Air Cushion Air Valve Pressure sensors MSP430 Launchpad MOSFET Switches

  11. Design Challenges / Alternatives • Number of Cells • More cells better for user comfort • Up to 25 cells controllable by single MSP430 microcontroller • Difficulty to construct custom cushion • Cell sealing challenges • Project time constraints

  12. Development Cost

  13. Production Run Cost • 5,000 units for 5 years

  14. Components Selected, Tested, Integrated • Semiconductor switches (TI) • Air compressor (Ryobi) • Pressure transducer (MSP-2202-ASX) • Solenoid Valves (GEMS-M-SERIES) • Air Cushion (ROHO MOSAIC) • MCU (Texas Instruments MSP430)

  15. Project Milestones • March 25th : Modify ROHO seat cushion. • March 28th : Mount the sensors and valves to the air regulation block. • April 4th : Complete circuits and wiring harnesses • April 18th : Develop and calibrate the MCU algorithm. • Control inflation and deflation of cells.

  16. Future Improvement • Graphical Display Touchscreen. • More air cells, moisture control, and temperature control. • Custom user pressure mapping interface. • MC-PAC for car seats and beds. • Make profile smaller, quieter, lighter, and more efficient.

  17. Questions

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