Accessible Incontinence Device Arin Ellingson, Marty Grasse, Jon Sass, Ben Schoepke, Dave Schurter RERC –AMI National Design Competition Advisor: Mitchell Tyler A rin

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Outline Problem Statement Background on Incontinence Design Requirements Accessibility Design Overview Monitoring Bladder Status Display Microcontroller Pinch Valve Future Work A rin

Problem Statement Incontinence: inability to control urine flow. Affects men and women, occurs more frequently with increasing age. Can cause infection, skin irritation, and embarrassment. Many patients avoid activities in public. A rin State motivation of project Negatively impacts quality of life Targeting active people

Background [1]

Background cont… Prevalence in US: > 10 million [2] 15-30% of geriatric population 85% of those affected are women $36 billion in related costs annually A rin

Design Requirements Allow voluntary emptying of the bladder Prevent undesired urine flow Provide an indication of bladder status Remain indwelling for up to 30 days with no adverse tissue reaction or material degradation Be easily used by a patient with disabilities Dave

Accessibility Target audience: individuals with sensory-motor, physical and/or cognitive disabilities Display/alerts should target multiple sensory receptors Programmable by user to meet their needs Will meet ADA guidelines for visual and audible alarms Dave Parkinsons, neurological disorders universal design [3]

Design Overview Foley catheter Our device: Attaches to catheter Flow valve Bladder monitor Controller/user display J on [4]

Design Logic Bladder Status Microcontroller Valve Indicator User Interface Do Nothing VALVE CONTROLLER CATHETER J on

Bladder Status Monitor Need to measure bladder volume Possible methods Ultrasound Mechanical Bladder pressure J on Liquid pressure sensor [5]

Bladder Volume vs. Pressure Voiding Filling J on [6]

Display Physical specs Functionality Belt-mounted and unobtrusive Houses batteries, microcontroller, user feedback devices Functionality Controls valve and processes bladder monitor data User interface Input: flow control switch, alert toggles Output: Visual, aural, and tactile feedback to indicate bladder status B en

Microcontroller Parallax BASIC Stamp 2 Pros: easy to program, many I/O pins, low power Cons: limited memory, expensive B en [7]

Pinch Valve Marty -pinch valve  no contact with urine, avoid crystallization caused by urea -simply clamps down on silicone catheter, cutting off flow -NO – safety -NC – significant power savings, mechanical override for safety? Max pressure it can withstand -ASCO valves, 6 VDC, 12 VDC, 24 VDC options -battery implications? -hold with thigh strap -mention previous group’s work? [8]

Future Work This semester Next semester Determine how to monitor bladder status Design controller and user interface Build and validate functional prototype Next semester Implement controller into battery-powered embedded system IRB approval for human subjects testing Create website for competition Marty

References http://www.urologyteam.com/Images/incintinence2.gif http://emedicine.com/ http://www.broward.org/images/arts/general/newadalogo.gif http://health.yahoo.com/media/healthwise/nr55551960.jpg http://www.dickey-john.com/_img/products/pw_a_LiquidPressureSensor.jpg M. Malbrain and D. Deeren, “Effect of bladder volume on measured invtravesical pressure: a prospective cohort study,” Crit. Care, vol. 10, no. 98. http://www.parallax.com/images/prod_jpg/bs2-ic.jpg http://asco.com/

Acknowledgements Questions? Wade Bushman, M.D., Ph.D. Naomi Chesler, Ph.D. Michael Malone, M.D. Abby Frese, R.N. Questions?