1. Heated Pulse-Lavage Justin S. Miller, Joe McFerron, and Ashley Danicic Dr. Dinakar Golla, M.D Linda Huckenstein, R.N Bioengineering Senior Design Department of Bioengineering University of Pittsburgh February 25, 2005

2. Background Lavages are most commonly used to remove debris from an organ or cavity via repeated pulsing injections of a sterile solutionLavages are most commonly used to remove debris from an organ or cavity via repeated pulsing injections of a sterile solution Heating the solution would…Heating the solution would… Increase circulation to the areaIncrease circulation to the area Reduce the risk of infectionReduce the risk of infection Increase the comfort of the patientIncrease the comfort of the patient

3. Review of Design Problem: A cheaper, simpler solution to providing heated saline during lavageProblem: A cheaper, simpler solution to providing heated saline during lavage Avoid use of an additional reservoirAvoid use of an additional reservoir Solution: Eliminate external pumps/heaters by applying heat directly to saline bagSolution: Eliminate external pumps/heaters by applying heat directly to saline bag

4. Overview MethodsMethods Criteria for successCriteria for success Group Achievements since last meetingGroup Achievements since last meeting Personal Achievements to datePersonal Achievements to date Updated time tableUpdated time table

5. Methods Review Heating bodies comparedHeating bodies compared Heat ExchangerHeat Exchanger Too bigToo big Too expensive ($1,000-$2,000)Too expensive ($1,000-$2,000) Constant flow via pumpConstant flow via pump MicrowaveMicrowave No temperature ControlNo temperature Control PVC IV Bag deforms at 135-180 degrees FPVC IV Bag deforms at 135-180 degrees F Constant need for reheatingConstant need for reheating Etched Foil HeaterEtched Foil Heater ThinThin FlexibleFlexible Integral ThermometerIntegral Thermometer

6. Criteria for success Ability to heat to specific temperatureAbility to heat to specific temperature Remains securely on bagRemains securely on bag Easy to use/operateEasy to use/operate Heating element is small, portable, and flexibleHeating element is small, portable, and flexible

7. Group Achievements Various options/design ideas researchedVarious options/design ideas researched Attained 2 lavage systems for testingAttained 2 lavage systems for testing Consulted with industry members for specific design considerationsConsulted with industry members for specific design considerations Discussed design criteria with heater manufacturersDiscussed design criteria with heater manufacturers Selected heater and insulator typesSelected heater and insulator types Thermofoil etched foil heaterThermofoil etched foil heater KaptonKapton

8. Kapton High dielectric strengthHigh dielectric strength Resistant to acids, solvents, and basesResistant to acids, solvents, and bases Manufactured for fluid immersionManufactured for fluid immersion Desireable Temperature RangeDesireable Temperature Range -200 – 200 degrees C-200 – 200 degrees C

9. Personal Achievements Assisted Joe with the Solidworks model and Cosmosworks experiment for current designAssisted Joe with the Solidworks model and Cosmosworks experiment for current design Interviewed surgeons at PresbyInterviewed surgeons at Presby Consulted heater manufacturersConsulted heater manufacturers Updated design history fileUpdated design history file

10. Updated Timetable Finite Element Analysis on heater using CosmosFloWorksFinite Element Analysis on heater using CosmosFloWorks (End of week)(End of week) Decide on type of thermocoupleDecide on type of thermocouple (End of week)(End of week) Order heater and thermocouple prototypesOrder heater and thermocouple prototypes (End of week)(End of week) Testing/AlterationsTesting/Alterations (Second and third weeks of March)(Second and third weeks of March)