156B Week 2

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

• • Analysis

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

    • Handheld device flow control interface sensor analysis: Pending arrival and testing

    • Component Analysis:

      • Load Cell Analysis: Complete

      • Handheld Flow Control Interface Sensor Analysis: Complete

      • Syringe Pump Analysis: Complete

  • Design

    • Syringe Pump: vendor contacted for information on a module that can be customized

    • Control Module: concept stage

      • Interface Design - Michael

      • Interface Logic - Michael

    • Handheld Device: concept stage

      • Ergonomic Prototypes - Everyone

    • Pressure Sensing: 

      • Disposable Pressure Transducers do not work within operating pressure range

      • Non-disposable transducers being explored, sample requests submitted

  • Fabrication

    • NA

  • Tests

    • 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 - Pending arrival of sensors

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

Accomplishments from Previous Week

• • Ordered handheld device interface sensors

    • Force Sensing Resistor

    • 2-axis Joystick

    • Thumb-wheel Potentiometer

    • Slide Potentiometer

    • Joystick Potentiometer

  • Acquired and tested disposable pressure transducers

    • Not feasible, non-disposable route will be followed

  • Found a syringe pump that satisfies our functional requirements

    • Capable of necessary flow rate 

    • Capable of microprocessor interface

    • Document compiled and attached

• Completed Failure Mode and Emergency Analysis with Dr. Beal

  • Document compiled and attached

• Completed fluidic analysis of syringe, tubing and needle

  • Found two models with which to calculate pressure

  • Document compiled and attached

• Acquired an Arduino Mega as a test-bed microprocessor

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

• • System CAD - Everyone

    • Particularly an ergonomic prototype

  • Completing control interface and logic architecture - Michael

  • Order syringe pump and interface with microprocessor - Pako

  • Test handheld sensors and interface with microprocessor - Jamie

    • Upon choosing a sensor, developing a design for integration with handheld device

  • Order and test non-disposable pressure transducer. Interface with microprocessor - Rene

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

• • Investigate possibility of a rocker type control for the handheld device [IN PERSON]

    • Integrated the design consideration in our order of sensors

    • Complete

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

• • Define the 2 syringes in presentation video [IN PERSON]

    • Both syringes are the same drug. Two syringes are present for convenience (i.e. holding two smaller syringes is easier than holding a single large syringe)

    • Completed

• Quantify and list cost constraints [IN PERSON]

  • • Control Module and Pump: up to our discretion

    • Completed

• • Emergencies and contingent actions must be better described/defined and put in table form [IN PERSON]

    • FMEA document completed

  • Get some CAD of overall concept [IN PERSON]

    • In progress

  • Quantify force to push syringe with Load Cell from Isaiah [IN PERSON]

    • Order of 40N

  • Quantify intra-neural injection pressure [IN PERSON]

    • 20-30psi

    • Completed

  • Clarify analysis description in weekly progress report [IN PERSON]

    • Completed

• Order sensors for handheld device [IN PERSON]

• • Completed

• Investigate syringe pump lead time [IN PERSON]

• • Two days for order to go through plus rush shipping

  • Completed

• Acquire and test two samples of disposable pressure transducer

• • Completed

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

• • Pending feedback from online forms

Risks and Areas of Concern

• Pressure sensing design has proven elusive

• Pump is not rated for medical use on humans

Resources or Information Required but not Available

• • NA

Schedule

• • Describe upcoming milestones

    • Obtaining a non-disposable pressure transducer

    • Ordering and testing syringe pump

    • Testing handheld device interface sensors (pending arrival)

  • Gantt Chart:

    • On track

    • Last updated March 31st, no adjustments needed since

Budget (list amount spent and amount remaining)

• • Spent: (Approx $50.00, pending receipts from JV)

  • Remaining: (Approx $2450, pending receipts from JV)

Progress on Report and Webpage

• • Webpage 

    • Internal page draft complete

  • Report 

    • NA