Quad-Rat Vitals Quad-Rat Vitals MonitorMonitorAdvisor: Paul ThompsonClient: Dr. Alex Converse
OverviewOverviewPET ImagingRequirementsExisting DevicesPrevious Semester’s WorkPulse Oximeter Probe Design
OptionsLabVIEW Interface Design OptionsWhere do we go from here?Acknowledgments
PET Imaging of RatsPET Imaging of RatsPositron
emission tomography (PET) scans to monitor location of tracers in rats
Client scans four anesthetized rats at a time◦ Needs to monitor
the rats’ vitals
http://homepages.cae.wisc.edu/~bme300/rat_monitor_s09/reports/FinalPaperSpring09.pdf
Requirements: Quads Vitals Requirements: Quads Vitals MonitorMonitorClient needs to simultaneously
monitor four rats1) SpO2 levels, accuracy of ±2%2) Heart rates up to 500 beats per
minute3) Respiratory rates of 20 to 30
breaths per minute4) Rectal temperatures of 93 - 100° F
Non-invasive probes and user-friendly interface
Existing DevicesExisting DevicesExisting devices:
◦Client currently uses rudimentary devices to monitor vitals
◦Available: Pulse oximeter for mice and rats Over $7000, one rat at a time
http://www.starrlifesciences.com/mri.html
Previous Semester’s WorkPrevious Semester’s WorkDeveloped circuit for
detecting breathing rate using force sensing resistor
Designed and calibrated thermistor to detect temperature
Designed Graphical User Interface (GUI) in LabVIEW displaying breathing rate and temperature
Attempted to reverse engineer existing Pulse Oximeter
Force sensing resistor
LabVIEW interface
General Probe General Probe RequirementsRequirementsApplicable for rats of varying sizeReusableSufficient blocking of ambient
lightCompatible LED and Photodiode
http://www.oximetry.org/pulseox/principles.htm
Foot ClipFoot ClipPros:
◦ Similar to current device
◦ Easy to reposition◦ Positioned far from
the headCons:
◦ Can displace easily◦ Risk of
LED/Photodiode misalignment
◦ Potential to apply excessive pressure
Foot WrapFoot WrapPros:
◦ No displacement once attached
◦ Alignment of LED/Photodiode maintained throughout testing
Cons:◦ Not adjustable◦ More involved
cleaning process
Tail ClipTail ClipPros:
◦ Easy to attach No confusion over
placement location
◦ AdjustableCons:
◦ May interfere with catheter in tail
◦ Potential to apply excessive pressure
Design Matrix – Pulse Oximeter Probe
Criteria (Weight)
Foot Clip Foot Wrap Tail Clip
Ergonomics(20)
18 12 14
Cost (5) 4 5 4
Accuracy (50)
46 46 35
Safety (10) 8 9 8
Durability (10)
9 6 9
Feasibility (5)
4 5 4
Total (100) 89 83 74
Four Corners with ButtonsFour Corners with Buttons
Full display
Four Corners with ButtonsFour Corners with ButtonsPros:
◦ Logical layout◦ Important
information visible
Cons:◦ Extra clicking◦ History graphs
incomparable◦ Less robust
A sample quarter of the final display
Tab InterfaceTab InterfacePros:
◦ Uncluttered interface
◦ Easy to program
Cons:◦ Inefficient◦ Data hard to
compare
Full display
Four Corners with Four Corners with HistoriesHistories
Full display
Four Corners with Four Corners with HistoriesHistories
Pros:◦ All data on one
screen◦ Easy to compare
trendsCons:
◦ Cluttered interface
◦ Tiny on small screen
A sample quarter of the final display
Design Matrix – LabVIEW InterfaceCriteria (Weight)
4 Corners with Buttons
Tabs 4 Corners with
Histories
Ergonomics (45)
38 25 44
Programming Feasibility (35)
26 32 30
Aesthetics (20)
15 18 14
Total (100) 79 75 88
Where do we go from Where do we go from here?here?Finish LabVIEW GUI
◦Determine how data will be collected from Pulse Oximeter
Design pulse-ox probe to fit rat’s hind paw◦Integrate with signal received from
Graduate Students’ circuitPrint circuit boards Fabricate housing apparatus
AcknowledgementsAcknowledgementsProfessor Paul ThompsonDr. Alex ConverseAmit NimunkarTim BalgemannLiz AhlersNate Werbeckes
Questions?Questions?
Top Related