Outline Background Client Requirements Track Design Mesh Liner System Gel Electrode Matrix Gel Liner System Design Matrix/Final Design Future WorkBackground: Frequently necessary to determine state of patient’s circulation Current methods invasive, complicated Impedance cardiography may be a solutionImpedance Cardiography Uses high frequency (100 kHz) to measure impedance and track volumetric changes occurring in the cardiac cycle Non-invasive, painless procedureImpedancecardiography.comImpedance Cardiography cont’dProblems Not accurate Imprecise electrode positioning Inconvenient to usersImproving the System: Move electrodes closer to heart Better signal Reduced noise Greater accuracyClient Specifications Electrodes closer to the heart More secure Easy to apply ReusableTrack Design Flexible, solid rubber backbone Track for proper Electrode placement Straps for proper location Possibilities of attachment to skinTrack Design cont’d Advantages Stability Reusable Durable Disadvantages Bulky Problem staying on desired locationMesh Liner System Mesh fabric holds electrodes Shelf liner prevents slipping Elastic band holds unit on patientMesh Liner System Advantages Easy to use and adjust Fairly easy to clean Conforms to body BreathableMesh Liner System Disadvantages Tearing/fraying Limited electrode contact Loss of elasticity over timeGel Electrode Matrix• Several electrodes suspended in a gel• Edges surrounded by hard plastic• Allows for hook up with an elastic strap• Electrode leads are not immersedGel Liner System Uses Silicone Rubber Gel Holes exist in gel Edges surrounded in malleable plastic Elastic Strap connectionDesign MatrixEase of Use(20)Placement Stability(20)Comfort(10)Reusability(20)Size(10)Total (80)Plastic Track System812218747Gel Electrode Matrix1816820971Gel Liner System *1818820973Mesh & Liner System1916918971Future Work Choose best possible designs Order materials Build preliminary prototypes and circuit amplifier Testing/Determine proper placing of electrodes Build Final PrototypeSources: http://chestjournal.chestpubs.org/content/122/3/771.full http://chestjournal.chestpubs.org/content/123/6/2028.fullShout Outs! A special thanks to Elena Bezrukova, Ryan Carroll, Amit Nimunkar, and Prof. Webster.Questions or
View Full Document
Unlocking...