P P09042 : Lap Band Test Stand Ilya RivkinTeam Lead(EE) John MatrachisiaLead Engineer (ME) Michael BatykoMechanical Engineer Kevin SandoMechanical Engineer Brian WeberElectrical Engineer Sponsor: QUANTUM Technology Associates, Inc.

Revision B2 Final Design Analog Pressure Gage Fill Port Synthetic stomach Lap Band Pumping Apparatus

Revision B3 Project Description Test stand for Lap Band Device The long-term goal of this project series is to design a new lap-band system that can be adjusted via a non-invasive procedure. This first phase of the project will primarily focus on the design of a testing stand to capture stomach and lap-band parameters. Some of the major goals for this project are to accurately simulate a human stomach as well as to develop an accurate metering scheme controlling and monitoring the movement of the saline solution.

Revision B4 Key high level customer needs/engineering specs -Synthetic Stomach -Measurement of Pressure and Forces on Stomach -Saline Pumping/Metering Scheme -Identification of Ranges for all test parameters -Collect and store Data -Size: mm diam and 5-10 mm thick. Similar mechanical properties to human stomach (stress, strain, etc.) and physical properties (texture, pressure in stomach, etc.) -Ranges to be measured by test stand -Pump 10 cc into and out of Lap Band in increments of 0.5 cc -Collected in labview GUI to be stored in a *.csv file

Revision B5

6 Design Summary Key Features: Pumping system accurately pumps 3-10 cc of fluid into and out of Lap-Band ® Synthetic stomach material that simulates the anatomical and mechanical properties of the human stomach where the Lap-Band ® is located Fluid pressure sensing (digital and analog). Force sensing Computer interface with volume control Volume, force, and pressure data acquisition and storage for easy viewing and manipulation

System Testing Results Revision B7

System Testing Results Revision B8

Verification of Specifications Revision B9 Engr. Spec. # ImportanceSource Specification (description)Unit of MeasureMarginal ValueIdeal ValueComments/Status ES1RequiredCN 1Test stand envelopemmxmmxmm1000x1000x x300x300 Complete. Test stand envelope is 610x305x340 ES2RequiredCN 2Artificial stomach size, diameter and thicknessmmxmm20-30x x5-10 Complete. Dimensions are x3-15 ES3RequiredCN 2 Artificial stomach material mechanical properties similar to biological stomach, Stress vs. Strain Mpa vs. mm/mm Complete. Qualitative and quantitative analysis. ES4RequiredCN 3, 10Measure static pressure of saline for pressure rangePSI (gage) Complete. Design includes both analog and digital pressure sensors that meet or exceed specifications ES5RequiredCN 3Measure Force on stomach for rangelb Complete. Design includes a 0-1lb and a 0-25lb force sensing resistor. ES6RequiredCN 5Pump saline into and out of Lap-Band, volumecc3-10 Complete. Pumping apparatus is designed to meet these specifications. ES7RequiredCN 5Pump saline into and out of Lap-Band, flow ratecc/min510 Complete. Flow rate >10cc/min ES8RequiredCN 8 Servicable/replacable components List. List of components that can be changed out or repaired. Feature Complete. ES9RequiredCN 4, 9 Test interface. Computer interface to control the operation of the test stand. Displays measured data. Feature Complete. Labview controls/data acquisition ES10RequiredCN 10 Collect and Store data. Stores static pressure of sailine, pressure on stomach, and volume of saline in Lap Band Device. Feature Complete. Labview program collects and stores data into.csv files for easy review and manipulation. ES11RequiredCN 5Lap Band diameter increment stepmm Complete. Diameter increment step of <0.2mm

Objective Project Evaluation Revision B10 Specifications: All specifications met or exceeded Budget: $ under budget Future Improvements: – Automated fluid flow rate measurements – Automated stomach diameter measurements – Built in power supply – More accurate stomach model