Mike Allocco, Soham Chakraborty, Leslie Havens, Danielle Koch, Andrew Miller, Kristeen Yee, Stephanie Zambito TEAM – MSD I PRESENTATION P14026_Detailed Design Review 12/05/13

 Problem Statement  Engineering Needs and Requirements  Functional Decomposition  Week 6 System Design  Current System Design  Connection to PEV  Assist & CPR Mode  Tubing  Trachea  Lung AGENDA  Sensor Placement  Pressure Sensors  Flow Sensors  Bill of Materials  Budget  Test Plan  Risk Assessment  Plan for MSD II P14026_Detailed Design Review 12/05/13

 Current State  1 st generation of a validation system  Desired State  Simulate the respiratory system and measure flow, pressure, volume, and oxygen concentration  Project Goals/Opportunities  Collect data to evaluate 13027’s PEV  Constraints  ANSI Z79.7  ISO 5469:1967  ASTM F  ISO PROBLEM STATEMENT P14026_Detailed Design Review 12/05/13

MATRIX P14026_Detailed Design Review 12/05/13

FUNCTIONAL DECOMPOSITION P14026_Detailed Design Review 12/05/13

DESIGN PROPOSED WEEK 9 P14026_Detailed Design Review 12/05/13

 Testing the LTV  Connection to the MediResp-III  Breathing into the LTV WHY THE DESIGN CHANGED P14026_Detailed Design Review 12/05/13

 Breaths per Minute  Breaths per Minute at 0.9 Lpb WHY THE DESIGN CHANGED MediResp-IIILTV DisplayObserved MediResp-IIILTV Display P14026_Detailed Design Review 12/05/13

 The LTV takes readings at the beginning and end of the tubing  Using the LTV would require the team to reverse engineer the LTV  Would be outside the time constraint of the project  Potentially, would be outside the budget constraint of the project WHY THE DESIGN CHANGED P14026_Detailed Design Review 12/05/13

CURRENT SYSTEM DESIGN P14026_Detailed Design Review 12/05/13

CONNECTION TO PEV P14026_Detailed Design Review 12/05/13

CURRENT SYSTEM DESIGN P14026_Detailed Design Review 12/05/13

 Actuation is an excellent way to make a process repeatable.  The rotational energy of a small motor would have to be converted to linear pushing/pulling.  An easy-to-execute choice was to use the rack-and- pinion  A lead screw was also considered, but these are less efficient ASSIST MODE COMPONENTS P14026_Detailed Design Review 12/05/13

 The 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 plunger ASSIST MODE COMPONENTS 100 mL Dist = x P14026_Detailed Design Review 12/05/13

 The 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: 1)Keep rack on a level with the pinion. 2)Leave space (0.01 in) on either side. 3)Fairly wide to allow for easier connection to plunger of the syringe. P14026_Detailed Design Review 12/05/13

 THREE CARDINAL RULES OF GEAR DESIGN:  Meshing gears must have the same height,  Distance between gears’ teeth (“pitch”) should be as close to same as possible  Different number of teeth is mechanically advantageous for torque- to-turn ratio and for speed of rotation. ASSIST MODE COMPONENTS P14026_Detailed Design Review 12/05/13

ASSIST MODE COMPONENTS HR -Pressure Angle 20deg -Circular Pitch 2mm -300mm Long -Pressure Angle 20deg -Circular Pitch 2mm -Bore Size to Order -23 Teeth SH2MS2B250F7ARM-2M-300 P14026_Detailed Design Review 12/05/13

 The 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 12/05/13

 SIZING OF THE STEPPER MOTOR  The 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 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 12/05/13

 Originally, the team planned on using the syringe, stepper motor, and actuation to simulate a patient receiving compressions  At first team counted compressions by sensing pressure  Team has narrowed the scope of their project CPR MODE P14026_Detailed Design Review 12/05/13

CURRENT SYSTEM DESIGN P14026_Detailed Design Review 12/05/13

TUBING P14026_Detailed Design Review 12/05/13

CURRENT SYSTEM DESIGN P14026_Detailed Design Review 12/05/13

TRACHEA RESISTANCE Target Resistance (cmH2O/L/Sec) d UB flow (mm)d LB flow (mm)davg (mm) P14026_Detailed Design Review 12/05/13

TRACHEA RESISTANCE CONT’D. P14026_Detailed Design Review 12/05/13

CURRENT SYSTEM DESIGN P14026_Detailed Design Review 12/05/13

 How can we vary lung compliance with only one test lung?  Add a weight  Use a rubber band LUNG COMPLIANCE P14026_Detailed Design Review 12/05/13

 Bezier Curves are splines that are controlled through the manipulation of control points BEZIER CURVES P14026_Detailed Design Review 12/05/13

BEZIER ANIMATION P14026_Detailed Design Review 12/05/13

COMPLIANCE PROGRAM P14026_Detailed Design Review 12/05/13

COMPARISON TO REAL DATA P14026_Detailed Design Review 12/05/13

CURRENT SYSTEM DESIGN P14026_Detailed Design Review 12/05/13

SENSOR PLACEMENT P14026_Detailed Design Review 12/05/13

 SM5470 -Product of Silicon Microstructures Incorporated  Low Pressure Scale 0-3 PSI  Gauge Pressure Sensor  Accuracy is.25%  Used within Medical Instrumentation and Monitoring PRESSURE READING P14026_Detailed Design Review 12/05/13

SENSOR PLACEMENT P14026_Detailed Design Review 12/05/13

 TSI 4000 Series Flow Meter  Flow Measurement:  Accuracy +/- 2% of reading  Range L  Response: 4ms  Pressure Measurement:  Accuracy +/- 1 kPa  Range kPa  Computer 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 to calibrate MediResp-IV FLOW METER P14026_Detailed Design Review 12/05/13

 Tested Mike exhalation of breath  Connected tubing to flow meter  Read in real time data PRELIMINARY FLOW TESTING P14026_Detailed Design Review 12/05/13

SENSOR PLACEMENT P14026_Detailed Design Review 12/05/13

 4320T15 Miniature PVDF Relief Valve  Temp. Range: 26  F to 255  F  Use with air  Relieve excess pressure in air lines  Valve body is PVDF  Seal is Buna-N RELEASE VALVE P14026_Detailed Design Review 12/05/13

CURRENT SYSTEM DESIGN P14026_Detailed Design Review 12/05/13

ELECTRICAL SCHEMATIC P14026_Detailed Design Review 12/05/13

EMANT300 LOW COST USB 24 DAQ MODULE  Up to 6 channels of differential multiplexed ADC  Single channel samples/sec  Single channel 16 bit 2500 samples/sec  1 channel of 8-bit D/A conversion  8 digital IO channels  One 16-bit general-purpose counter or 16-bit PWM  USB connection  25 pin D-Sub connects to physical world  Application adaptors with instructional guides  LabView compatible  Cost = $ P14026_Detailed Design Review 12/05/13

PCB LAYOUT P14026_Detailed Design Review 12/05/13

BILL OF MATERIALS Purchasing Req #Part NamePart NumberVendorQuantity, Amount 1PVC Tubing E+11Home Depot 1, 10 ft, 1/2 inch diameter 2SyringeSYRMJ140LLsyringepump.com1, 140 mL 3Stepper MotorSTP-MTR-17040automationdirect.com1, 2 W 4ComputerDell Precision T1700Dell1, use lab computer 5Pressure Sensor987-sm g-bmouser.com2, psi 6TSI Mass Flowmeter , Rev GTSI1, Std L/min 7Aluminium Sheet hardwareandtools.com1 8Bolts TBHS ‑ 104 monsterfastener.com4 9O-RingsAS oringsonline.com2 10PVC Flanges zorotools.com2 11PVC Cement/Primer kitKT1010spadepot.com1 12Valve (release, ball)4320T15 1, 1 psi 13Rack+Pinion GearsKWGDLqtcgears.com1 14DAQ Board EMANT300 USB 24 bit DAQ ModuleEMANT1, 15LabView 1, use lab computer 16Siemen Lung Medical Support Products1, have 17PVC CaulkT9AB598814globalindustrial.com1, 10.3 oz. 18 Computer Cable (mini-DIN to 9-bin D-Sub) TSI1 19RS232 Serial Command Set Manual TSI1 20D-sub 25 Socket1125FEA-NDdigikey.com1 21Op-Amp (buffer)512-KA2904DTFmouser.com2 22PCB oshpark.com3 23 CKD Series PVC Check Valve for low pressureCKD050V-PVPlast-O-Matic (amazon.com)1 P14026_Detailed Design Review 12/05/13

BUDGET Purchasing Req #Part Name Sub Total Shipping Total Price 1PVC Tubing$5.70$0.00$5.70 2Syringe$4.95 3Stepper Motor$18.00$6.00$ Computer$779.00$0.00 5Pressure Sensor$30.08$6.99$ TSI Mass Flowmeter 4040$925.00$0.00 7Aluminium Sheet$13.80$7.29$ Bolts$1.40$0.00$1.40 9O-Rings$7.36$7.50$ PVC Flanges$9.80$5.79$ PVC Cement/Primer kit$9.95$3.95$ Valve (release, ball)$ Rack+Pinion Gears$40.00$5.00$ DAQ Board$ LabView$500.00$ Siemen Lung$199.00$ PVC Caulk$12.75$5.00$ Computer Cable (mini-DIN to 9-bin D-Sub)$45.00$ RS232 Serial Command Set Manual$ D-sub 25 Socket$ Op-Amp (buffer)$1.14$6.99$ PCB$25.00$0.00$ CKD Series PVC Check Valve for low pressure$36.91$0.00$36.91 $2,796.95$ P14026_Detailed Design Review 12/05/13

 Leak Test  Test sequentially over build of assembly using flow meter  If lose 1% of flow, then look into forming better seals  Calibration Test of Pressure Sensors  Use manometer to validate pressure sensors  If within 5% of the sensor, then proceed  Calibration Test of Flow Meter  Use validated pressure sensors over a known distance to validate flow meter  Take into account the discrepancy between analytical and experimental values  Timing of Actuation  Use stopwatch or switch to time and validate actuation is working as expected  See mitigation plan (in future slide) TEST PLAN FOR OUR SYSTEM P14026_Detailed Design Review 12/05/13

RISK ASSESSMENT P14026_Detailed Design Review 12/05/13

RISK ASSESSMENT P14026_Detailed Design Review 12/05/13

RISK ASSESSMENT Failure ModeTriggerMitigation PlanOwner Failure of communication between electrical and mechanical system (1) System is unable to record or store data Problemshoot the connections between sensors and electrical system. Mike, Stephanie Software 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 inputs Check code and logic behind the code. Look up the error that the software is returning. Mike Actuation failure(1) If during week 8 actuation is still a high concern of the team, (2) expert advice is to disregard actuation Change team focus to manually moving the syringe in standardized fashion. Leave actuation of the syringe as future work for a future team. Danielle Failure to measure outputs accurately (1) Data is inconsistent, (2) data does not make sense Check programming, sensors and follow test plan. If failure mode continues, seek expert advice to see where system is failing. Leslie Poor/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 review Team 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. Kris P14026_Detailed Design Review 12/05/13

PLAN FOR MSD II P14026_Detailed Design Review 12/05/13

QUESTIONS? P14026_Detailed Design Review 12/05/13

BACK-UP SLIDES P14026_Detailed Design Review 12/05/13

MATH BEHIND COMPLIANCE PROGRAM Control Pointxy P000 P P P P P560 Point 100 Point Point Point Point Point 660 P14026_Detailed Design Review 12/05/13

 Corrugated pipe can be assumed smooth at corrugation heights and wavelengths much less than pipe radius.  “Instabilities of Flow in Corrugated Pipes” - Tao SMOOTH PIPE ASSUMPTION P14026_Detailed Design Review 12/05/13