Bioengineering Senior Design Department of Bioengineering University of
Bioengineering Senior Design Department of Bioengineering University of Pittsburgh February 25, 2005 Heated Pulse-Lavage Justin S. Miller, Joe Mc. Ferron, and Ashley Danicic Dr. Dinakar Golla, M. D Linda Huckenstein, R. N
Background • Lavages are most commonly used to remove debris from an organ or cavity via repeated pulsing injections of a sterile solution • Heating the solution would… • Increase circulation to the area • Reduce the risk of infection • Increase the comfort of the patient
Review of Design • Problem: A cheaper, simpler solution to providing heated saline during lavage • Avoid use of an additional reservoir • Solution: Eliminate external pumps/heaters by applying heat directly to saline bag
Overview • • • Methods Criteria for success Group Achievements since last meeting Personal Achievements to date Updated time table
Methods Review • Heating bodies compared • Heat Exchanger • Too big • Too expensive ($1, 000 -$2, 000) • Constant flow via pump • Microwave • No temperature Control • PVC IV Bag deforms at 135 -180 degrees F • Constant need for reheating • Etched Foil Heater • Thin • Flexible • Integral Thermometer
Criteria for success • • Ability to heat to specific temperature Remains securely on bag Easy to use/operate Heating element is small, portable, and flexible
Group Achievements • • • Various options/design ideas researched Attained 2 lavage systems for testing Consulted with industry members for specific design considerations • Discussed design criteria with heater manufacturers • Selected heater and insulator types • Thermofoil etched foil heater • Kapton
Kapton • • High dielectric strength Resistant to acids, solvents, and bases Manufactured for fluid immersion Desireable Temperature Range • -200 – 200 degrees C
Personal Achievements • Assisted Joe with the Solidworks model and Cosmosworks experiment for current design • Interviewed surgeons at Presby • Consulted heater manufacturers • Updated design history file
Updated Timetable • Finite Element Analysis on heater using Cosmos. Flo. Works • (End of week) • Decide on type of thermocouple • (End of week) • Order heater and thermocouple prototypes • (End of week) • Testing/Alterations • (Second and third weeks of March)
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