Team 14026 MSD I Presentation

Mike Allocco, Soham Chakraborty, Leslie Havens, Danielle Koch, Andrew Miller, Kristeen Yee, Stephanie ZambitoTeam 14026 MSD I PresentationP14026_Detailed Design Review 12/05/13Kris1Problem StatementEngineering Needs and RequirementsFunctional DecompositionWeek 6 System DesignCurrent System DesignConnection to PEVAssist & CPR ModeTubingTracheaLungAgendaSensor PlacementPressure SensorsFlow SensorsBill of MaterialsBudgetTest PlanRisk AssessmentPlan for MSD IIP14026_Detailed Design Review 12/05/13Kris2Current State1st generation of a validation systemDesired StateSimulate the respiratory system and measure flow, pressure, volume, and oxygen concentrationProject Goals/OpportunitiesCollect data to evaluate 13027s PEVConstraintsANSI Z79.7ISO 5469:1967ASTM F1100-90ISO 80601-2-12Problem StatementP14026_Detailed Design Review 12/05/13Soham3Matrix

P14026_Detailed Design Review 12/05/13Soham4Functional Decomposition

P14026_Detailed Design Review 12/05/13Soham5Design Proposed Week 9

P14026_Detailed Design Review 12/05/13Soham6Testing the LTVConnection to the MediResp-IIIBreathing into the LTVWhy the Design Changed

P14026_Detailed Design Review 12/05/13Soham7Breaths per Minute

Breaths per Minute at 0.9 LpbWhy the Design ChangedMediResp-IIILTV DisplayObserved4.61001774123MediResp-IIILTV Display4.6267351046P14026_Detailed Design Review 12/05/13Soham8The LTV takes readings at the beginning and end of the tubingUsing the LTV would require the team to reverse engineer the LTVWould be outside the time constraint of the projectPotentially, would be outside the budget constraint of the projectWHY The Design Changed

P14026_Detailed Design Review 12/05/13Stephanie9Current System Design

P14026_Detailed Design Review 12/05/13Stephanie10Connection to PEV

P14026_Detailed Design Review 12/05/13Stephanie11Current System Design

P14026_Detailed Design Review 12/05/13Danielle12Actuation is anexcellent way to makea process repeatable.The rotational energyof a small motor wouldhave to be converted tolinear pushing/pulling.An easy-to-execute choicewas to use the rack-and-pinionA lead screw was alsoconsidered, but these areless efficientAssist Mode Components

P14026_Detailed Design Review 12/05/13Danielle13The syringe is 150mL and we expect to move roughly 100mL at a time, based on a typical inhalation.

The rack part of the rack-and-pinion must make a solid connection with the plungerAssist Mode Components

100 mLDist = x

P14026_Detailed Design Review 12/05/13Danielle14The rack will need support to avoid slipping out of place.The typical solution is to fit the rack into a short channel to constrain its path.Assist Mode Components

Characteristics of the Rack as Designed:

Keep rack on a level with the pinion.Leave space (0.01 in) on either side.Fairly wide to allow for easierconnection to plunger of the syringe.P14026_Detailed Design Review 12/05/13Danielle15THREE CARDINAL RULES OF GEAR DESIGN:Meshing gears must have the same height,Distance between gears teeth (pitch) should be as close to same as possibleDifferent number of teeth is mechanically advantageous for torque-to-turn ratio and for speed of rotation.

Assist Mode Components

P14026_Detailed Design Review 12/05/13Danielle16Assist Mode Components

-35-45 HR-Pressure Angle 20deg-Circular Pitch 2mm-300mm Long-Pressure Angle 20deg-Circular Pitch 2mm-Bore Size to Order-23 TeethSH2MS2B250F7ARM-2M-300P14026_Detailed Design Review 12/05/13Danielle17The gear connection to the stepper motor relies on the motors default pin being able to find purchase in the gear bore.The round pin of the motor is 5mm. We expect to order the gear at a NEMA#23 single-flat bore type.Assist Mode Components

P14026_Detailed Design Review 12/05/13Danielle18SIZING OF THE STEPPER MOTORThe maximum expected resistance to motion is a volume of 100mL of air.We would like to be able to apply the pressure of roughly half a breath (17 cmH2O or 1.667 kPa)We would like a fairly quick reaction time of 0.2 sec.Recall that Work/Time is Power, so analysis yielded:

Moreover, stepper motors are roughly 50% efficient, so the stepper motor selected was sized at 2 Watts of power.The stepper motor is also bidirectional to allow for retraction.Assist Mode Components

P14026_Detailed Design Review 12/05/13Danielle19Originally, the team planned on using the syringe, stepper motor, and actuation to simulate a patient receiving compressionsAt first team 13027 counted compressions by sensing pressureTeam 13027 has narrowed the scope of their projectCPR ModeP14026_Detailed Design Review 12/05/13Danielle20Current System Design

P14026_Detailed Design Review 12/05/13Andrew21TubingP14026_Detailed Design Review 12/05/13Andrew22Current System Design

P14026_Detailed Design Review 12/05/13Andrew23Trachea ResistanceTarget Resistance (cmH2O/L/Sec)d UB flow (mm)d LB flow (mm)davg (mm)55.6524.2584.955253.812.8543.332503.2072.4012.8041002.6972.0192.3581502.4381.8252.13152002.271.6981.984P14026_Detailed Design Review 12/05/13Andrew24 Trachea Resistance contd.

P14026_Detailed Design Review 12/05/13Andrew25Current System Design

P14026_Detailed Design Review 12/05/13Mike26How can we vary lung compliance with only one test lung?Add a weight Use a rubber band

Lung Compliance

P14026_Detailed Design Review 12/05/13Mike27Bezier Curves are splines that are controlled through the manipulation of control points

Bezier Curves

P14026_Detailed Design Review 12/05/13Mike28

Bezier animationP14026_Detailed Design Review 12/05/13Mike29Compliance programP14026_Detailed Design Review 12/05/13Mike30Comparison to Real data

P14026_Detailed Design Review 12/05/13Mike31Current System Design

P14026_Detailed Design Review 12/05/13Leslie32Sensor Placement

P14026_Detailed Design Review 12/05/13Leslie33SM5470 -Product of Silicon Microstructures IncorporatedLow Pressure Scale 0-3 PSIGauge Pressure SensorAccuracy is .25%Used within Medical Instrumentation and Monitoring

Pressure Reading

P14026_Detailed Design Review 12/05/13Leslie34Sensor Placement

P14026_Detailed Design Review 12/05/13Stephanie35TSI 4000 Series Flow MeterFlow Measurement:Accuracy +/- 2% of readingRange 0.01-99.9LResponse: 4msPressure Measurement:Accuracy +/- 1 kPaRange 50-199kPaComputer Cable (mini-DIN to 9 pin D-Sub) allows interface between device and computer.Outcome: Data logging for flow and volume measurements

*Note same device used by 13027 to calibrate MediResp-IVFlow Meter

P14026_Detailed Design Review 12/05/13Stephanie36Tested Mike exhalation of breathConnected tubing to flow meterRead in real time dataPreliminary Flow testing

P14026_Detailed Design Review 12/05/13Stephanie37Sensor Placement

P14026_Detailed Design Review 12/05/13Mike384320T15 Miniature PVDF Relief ValveTemp. Range: 26F to 255FUse with airRelieve excess pressure in air linesValve body is PVDFSeal is Buna-NRelease Valve

P14026_Detailed Design Review 12/05/13Mike39Current System Design

P14026_Detailed Design Review 12/05/13Leslie40Electrical Schematic

P14026_Detailed Design Review 12/05/13Leslie41EMANT300 Low Cost USB 24 DAQ Module

Up to 6 channels of differential multiplexed ADCSingle channel 22 bit @ 10 samples/secSingle channel 16 bit waveform @ 2500 samples/sec1 channel of 8-bit D/A conversion8 digital IO channelsOne 16-bit general-purpose counter or 16-bit PWMUSB connection25 pin D-Sub connects to physical worldApplication adaptors with instructional guidesLabView compatibleCost = $99.00http://www.emant.com/251004.pageP14026_Detailed Design Review 12/05/13Stephanie42PCB Layout

P14026_Detailed Design Review 12/05/13Leslie43Bill of MaterialsPurchasing Req #Part NamePart NumberVendorQuantity, Amount1PVC Tubing6.11942E+11Home Depot1, 10 ft, 1/2 inch diameter2SyringeSYRMJ140LLsyringepump.com1, 140 mL3Stepper MotorSTP-MTR-17040automationdirect.com1, 2 W4ComputerDell Precision T1700Dell1, use lab computer5Pressure Sensor987-sm5470-015-g-bmouser.com2, 0-1.5 psi6TSI Mass Flowmeter 40401980339, Rev GTSI1, 0-300 Std L/min7Aluminium Sheet53538520052hardwareandtools.com18BoltsTBHS104monsterfastener.com49O-RingsAS568-021oringsonline.com210PVC Flanges854-005zorotools.com211PVC Cement/Primer kitKT1010spadepot.com112Valve (release, ball)4320T151, 1 psi13Rack+Pinion GearsKWGDLqtcgears.com114DAQ BoardEMANT300 USB 24 bit DAQ ModuleEMANT1,15LabView1, use lab computer16Siemen Lung6006832Medical Support Products1, have17PVC CaulkT9AB598814globalindustrial.com1, 10.3 oz.18Computer Cable (mini-DIN to 9-bin D-Sub)1303583TSI119RS232 Serial Command Set Manual1980340TSI120D-sub 25 Socket1125FEA-NDdigikey.com121Op-Amp (buffer)512-KA2904DTFmouser.com222PCBoshpark.com323CKD Series PVC Check Valve for low pressureCKD050V-PVPlast-O-Matic (amazon.com)1P14026_Detailed Design Review 12/05/13Kris44BudgetPurchasing Req #Part Name Sub Total Shipping Total Price 1PVC Tubing$5.70$0.00$5.702Syringe$4.95$4.953Stepper Motor$18.00$6.00$24.004Computer$779.00$0.00$0.005Pressure Sensor$30.08$6.99$37.076TSI Mass Flowmeter 4040$925.00$0.00$0.007Aluminium Sheet$13.80$7.29$21.098Bolts$1.40$0.00$1.409O-Rings$7.36$7.50$14.8610PVC Flanges$9.80$5.79$15.5911PVC Cement/Primer kit$9.95$3.95$13.9012Valve (release, ball)$27.78$27.7813Rack+Pinion Gears$40.00$5.00$45.0014DAQ Board$99.00$99.0015LabView$500.00$0.00$0.0016Siemen Lung$199.00$0.00$0.0017PVC Caulk$12.75$5.00$17.7518Computer Cable (mini-DIN to 9-bin D-Sub)$45.00$0.00$0.0019RS232 Serial Command Set Manual$0.00$0.00$0.0020D-sub 25 Socket$5.33$5.3321Op-Amp (buffer)$1.14$6.99$8.1322PCB$25.00$0.00$25.0023CKD Series PVC Check Valve for low pressure$36.91$0.00$36.91$2,796.95$403.46P14026_Detailed Design Review 12/05/13Kris45Leak TestTest sequentially over build of assembly using flow meterIf lose 1% of flow, then look into forming better sealsCalibration Test of Pressure SensorsUse manometer to validate pressure sensorsIf within 5% of the sensor, then proceedCalibration Test of Flow MeterUse validated pressure sensors over a known distance to validate flow meterTake into account the discrepancy between analytical and experimental valuesTiming of ActuationUse stopwatch or switch to time and validate actuation is working as expectedSee mitigation plan (in future slide)Test Plan for our systemP14026_Detailed Design Review 12/05/13Kris/Danielle46Risk assessment

P14026_Detailed Design Review 12/05/13Kris47Risk Assessment

P14026_Detailed Design Review 12/05/13Kris48Risk AssessmentFailure ModeTriggerMitigation PlanOwnerFailure of communication between electrical and mechanical system(1) System is unable to record or store dataProblemshoot the connections between sensors and electrical system. Mike, StephanieSoftware errors (i.e. compilation errors, run time error, inputs do not match outputs)(1) Receive errors from the computer, (2) data does not make sense with the given inputsCheck code and logic behind the code. Look up the error that the software is returning.MikeActuation failure(1) If during week 8 actuation is still a high concern of the team, (2) expert advice is to disregard actuationChange team focus to manually moving the syringe in standardized fashion. Leave actuation of the syringe as future work for a future team.DanielleFailure to measure outputs accurately(1) Data is inconsistent, (2) data does not make senseCheck programming, sensors and follow test plan. If failure mode continues, seek expert advice to see where system is failing.LesliePoor/ineffective communication between team members(1) group member complains, (2) a group member shows no improvement in the next phase after receiving a bad peer reviewTeam Lead will talk to the team member or team members to discuss what changes must occur. If failure mode continues the team will talk to the guide.KrisP14026_Detailed Design Review 12/05/13Kris49Plan for Msd II

P14026_Detailed Design Review 12/05/13Kris50Questions?

P14026_Detailed Design Review 12/05/1351Back-Up SlidesP14026_Detailed Design Review 12/05/13Math behind compliance ProgramControl PointxyP000P12.25064485746.93264P20.3065969391203.165P34.8606556762243.364P44.454849913-257.988P560Point 100Point 21.85700Point 32.851000Point 44850Point 55300Point 660P14026_Detailed Design Review 12/05/13Corrugated pipe can be assumed smooth at corrugation heights and wavelengths much less than pipe radius.Instabilitiesof Flow inCorrugatedPipes - TaoSMOOTH PIPE ASSUMPTION

P14026_Detailed Design Review 12/05/13