156B Week 5

Overview of Status of Analysis, Design, Fabrication, Tests, etc.

• • Analysis

    • Pending

      • Switch FBD and geometric analysis [In Progress]

      • Pressure comparison. In-body to measured

    • Complete

      • Bernoulli and Navier Stokes Analysis through syringe, tubing and needle: Complete

      • Handheld device flow control interface sensor analysis: Complete

      • Component Analysis:

        • Load Cell Analysis: Complete

        • Handheld Flow Control Interface Sensor Analysis: Complete

        • Syringe Pump Analysis: Complete

  • Design

    • Pending

      • Control Module: Functional design generation stage

        • Box Selection

        • Dummy Layout - Pending Feedback

      • Handheld Device: ergonomic prototypes

        • Ergonomic Prototypes - New iteration w/ Dr. Beal's feedback in progress

        • Sensor interface - Prototypes in progress

      • Pressure Sensing: 

        • Calibration will be attempted for Disposable Pressure Transducers pending arrival of signal conditioning circuit elements (DC/DC Converter)

    • Complete

      • Handheld Device

      • 1st Ergonomic Iteration

    • Control Box

      • Dummy Layout

      • Syringe Pump: Ordered, delivery pending (Arrival by 4/30)

  • Fabrication

    • Pending

      • Handheld Device

        • 2nd Iteration of Ergonomic Prototype

        • Sensor Housing Prototype - In Progress

    • Control Box

  • Complete

    • 1st Iteration of Ergonomic Prototype

  • Tests

    • Pending

      • Connecting syringe pump and testing flow rates - Functional Requirement Verification

      • Calibration test for disposable pressure transducers

      • Pressure sensing tests with inflatable bladder/fruit etc.

    • Complete

      • Connecting disposable pressure transducer and acquiring a signal - Complete

        • Operating pressure of our device is outside the linear limits of available disposable pressure transducers

      • Connecting and playing with sensors for handheld device interface - Complete

Accomplishments from Previous Week

• Received feedback about 1st ergonomic iterations

• Completed CAD for handheld sensor housing prototype

• Completed draft of menu navigation logic structure

• Completed first draft of screen layouts for all steps

• Completed dummy layout for buttons

• Completed additional switch research

• Select screens and buttons

• Selected Control Box

Goals for Next Week (list names after each item). Use specific and measurable objectives.

• • Complete next iteration of ergonomic prototype based on Dr. Beal's feedback - Michael

  • Fabricate sensor interface - Michael

  • Interface syringe pump with microprocessor and handheld switch- Rene

  • Interface disposable transducer with microprocessor - Rene

  • Control Box CAD based on Dr. Beal's feedback on dummy layout - Jamie

  • Order screens and buttons - Jamie

  • Selection of off-the-shelf control box for customization and purchase - Pako

• Completing control interface and logic architecture - Pako

Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)

• • Date: 4/22/14, IN PERSON

  • Handheld Device

    • Wants similar dimensions to ergonomic models

    • Likes the snap feature but it can be integrated without the tuohy wings

    • Ideally wants it adaptable to many types of tuohy needles

  • Control Box

    • Screen

      • Likes bigger digits

    • Likes the idea of customizable face plate

Instructor Comments from Last Meeting and Actions Taken to Address these Comments  (indicate date of comments and if via email or in person)

• • Date: 4/22/14, IN PERSON

    • Presentation

      • Missed key things in problem definition

        • Should be expressed concisely and explicitly

  • Week 6

    • Prepare for proof of concept presentation

  • Tests

    • Start simple

    • Come up with some tests

  • Milestones

    • Define milestones for week 6 [complete]

  • Feedback Signal

    • How to get the user to notice what's going on

  • Switches

    • People like travel

    • Find 1D/single-axis motion switches

    • Think of housing and cabling

Comments from Other Students in the Class (indicate date  of comments and if via email or in person)

• • Date: 4/14/14, WRITTEN COMMENTS FROM PRESENTATION

    • What will be the power source

      • Should be defined by meeting w/ Dr. Roberts

Risks and Areas of Concern

• Sponsor may be defining design requirements too broad for the scope of the project

Resources or Information Required but not Available

• • NA

Schedule

• • Describe upcoming milestones

    • Interfacing syringe w/ pump and handheld switch (4/30 - 5/2)

    • Interfacing w/ Transducer (5/9)

    • Finalizing control interface and buttons/screens (5/2)

    • Test handheld sensor housing design (5/2)

    • Select Control Box (5/2)

    • Calibrate Pressure Sensor (5/9)

  • Gantt Chart:

    • A little behind

    • Last updated: 4/23/14

Budget (list amount spent and amount remaining)

• • Spent: $750.00

  • Remaining: $1750.00

Progress on Report and Webpage

• • Webpage 

    • Internal page draft complete

    • Home page in progress

  • Report 

    • In Progress

      • Work has been divided and has commenced