Overview of Status of Analysis, Design, Fabrication, Tests, etc.
Analysis
Flow Rate Analysis: In progress
Load Cell Analysis: In progress
Flow control sensor Analysis: In progress
Syringe Pump Mechanism Analysis: In progress
Design
Syringe Pump: vendor contacted for information on a module that can be customized
Control Module: concept stage
Handheld Device: concept stage
Pressure Sensing: concept stage
Phlebostatic axis is used to prevent incorrect pressure readings due to height difference if a pressure transducer is used for arterial pressure sensing. Similar zeroing method could be developed.
Fabrication
NA
Tests
Using load cell to quantify force required to push syringe typically used in the procedure
In process of obtaining load cell and syringe
Disposable Pressure Transducer:
Test required to familiarize with signal pending on getting a sample from vendor or via Dr. Beal
Transducer's output signal is suspected to output a conditioned signal for systolic and diastolic blood pressures
Accomplishments from Previous Week
Contacted Syringe Pump vendor
Obtained pricing on OEM/Custom syringe pumps with the features we need. Approximately $600
Had conversations about technical features and capabilities/limitations of the product
Product found to be much cheaper than full-function syringe pumps on the market, conversations about specifications will continue.
Contacted Disposable Pressure Transducer vendor
Identified unit cost of $5-$7 depending on configuration
Referred to UCSD hospitals for a quicker turnaround on a transducer sample
Communication with device is done through a phone jack
Researched diaphragm seals
Failed to find disposable medical grade solutions
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Quantify force of syringe push [Michael]
Better understanding of intra-neural pressure [Jamie]
Obtain disposable pressure transducer sample [Rene]
Obtain tubing and syringe samples from Dr. Beal [Pako]
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
NA
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]
To be defined
Quantify and list cost constraints [IN PERSON]
Disposable handheld unit. Dr. Beal would like the long term cost of the disposables to be no more than $15.00
Control Module and Pump: to be defined
Emergencies and contingent actions must be better described/defined [IN PERSON]
To be defined
Investigate effects of hysteresis from system friction, particularly in the syringe [IN PERSON]
To be defined
Get some CAD of overall concept [IN PERSON]
NA
Investigate cost and customization of existing market ready pumps [IN PERSON]
Vendor was called
Email presentation w/ feedback to sponsor [IN PERSON]
Completed
Comments from Other Students in the Class (indicate date of comments and if via email or in person)
Figures in presentation were not clear [IN PERSON]
Problem was not well stated or defined in presentation [IN PERSON]
Risks and Areas of Concern
Load cell design: Hysteresis due to system friction
Disposable Pressure Transducer design: nature of output signal from existing transducers is unknown
Diaphragm seal design: Difficulty finding disposable medical grade diaphragm seals
Resources or Information Required but not Available
What pressures are found when an intra-neural injection is happening. Sources are lacking definitive conclusions but it seems to be in the order of 70 kPa (550mmHg)
Schedule
Describe upcoming milestones
Analysis completion by end of week 1
Quantification of force and pressure parameters by end of week 1
Define emergencies and fail safe by end of week 1
Gantt Chart:
Updated March 31st
Budget (list amount spent and amount remaining)
Spent: $0.00
Remaining: $2500.00
Progress on Report and Webpage
Webpage
Internal page draft complete
Report
NA