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Vanderbilt Senior Design 2009: Non-Electronic Blood Pressure Assist Device

Designing a mechanical adjunct to sphygmomanometer to identify systolic pressure for minimally trained users in developing clinics without electricity, aiming to simplify blood pressure measurements. The device seeks to be cost-efficient, easily manufacturable, and durable for widespread usability.

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Vanderbilt Senior Design 2009: Non-Electronic Blood Pressure Assist Device

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  1. Vanderbilt Senior Design 2009:Non-Electronic Blood Pressure Assist Device Members: Laura Allen (ChemE) James Berry (BME) Casey Duckwall (BME) David Harris (ChemE) Mentor: Prof. Baudenbacher

  2. Non-Electronic BP Assist Device • The Engineering World Health (EWH) Organization proposed the challenge: • Can a mechanical adjunct for a sphygmomanometer be designed to amplify the oscillatory pressure signal? • Can the design be used by minimally trained users to identify at least systolic pressure? (Ideally diastolic too)

  3. Current Oscillatory BP Methods • Electronic • Utilize algorithms to extract systolic and diastolic measurements from pressure oscillations in cuff [1]. • Not divulged by manufacturer http://img.medscape.com/fullsize/migrated/514/540/adnc514540.fig2.gif

  4. Developing World Usability • Non-electronic • Many rural clinics may be without electricity • Low Cost: Less than $5 • When produced in quantities of 2000+ • Mechanical adjunct to sphygmomanomter • Eliminating the need for Korotkoff sound identification • Identify at least systolic • Pictorial instructions for widespread users

  5. Additional Design Considerations • Finish design for EWH competition by May 30th, 2010. • In addition to EWH specification, for successful implementation in developing countries: • Easily manufactured • Durable • Mechanically simple http://globalhealth.duke.edu/graphics4docs/Mulago_Hopsital_Uganda.JPG

  6. BP Device: How it will be used • Developing world clinic/hospital work will attach sphygmomanometer to patient • BP device will be mechanically attached • Worker will inflate cuff ~20-30 mmHg above estimated systolic pressure • Bleed cuff at standard rate of 3 mmHg/sec [1] • Monitor adjunct device for indication of systolic pressure • Use device’s systolic reading and classification chart to identify patient as normal BP, prehypertensive, or hypertensive

  7. Device Goals and Success Parameters • Decrease difficulty in obtaining blood pressure measurements for developing countries • Meet affordability goal of $5 production cost • Design be easily mass produced • Reading from BP device be accurate enough for clinical diagnosis of hypertension • Ultimately, an easy method for identifying hypertension is the first step in decreasing cardiovascular diseases related deaths in third-world settings

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