Accessible Infusion Pump User-Interface - Biomedical Engineering ...

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infusion pump, it may become apparent that a single board computer is abetter choice. This is limited be several factors including price and the ability ofthe single board operating system to interface with the infusion pump’sprotocols. An optimization study will be run when enough information has beengathered.SW ArchitectureOne essential requirement of the infusion pump interface is that it be easy tooperate and not intimidating. Because of this, simple and intuitive softwarearchitecture is needed. The inputs will be split into three groups. The primaryinfusion, the secondary infusion and the total volume infused will each berepresented by a different ‘window’ on the graphic user interface. Using thearrow buttons a highlighting frame will be moved clockwise or anti-clockwisearound the graphic interface, depending on which arrow button is used. Whena window is highlighted by this frame, the OK button will select it. For the primaryand secondary infusion windows, this selection will bring about a protocolthrough which to program rates and volumes to be infused, as seen in Fig.2.1.1.6. The rate will first be set digit by digit using the arrow buttons to select adigit 0-9 and the OK button to move the cursor to the next digit. After all digitsare entered, a final OK will bring about a confirmation. The user will be askedvisually and audibly if the entered information is correct. The user will then haveto actively select [YES] to confirm this by using one of the arrow buttons to movea cursor off of [NO] and onto [YES] and then pressing the OK button. If [NO] isselected, the user will be returned to the rate select screen and will be able tomodify the information. Following the entry of the rate, the volume to be infusedwill be entered in a similar fashion. Once a rate and a volume to be infused hasbeen entered, the user will be returned to the top level of the graphic userinterface where [START INFUSION] and [STOP INFUSION] are now availableoptionsIt is not yet clear whether there must always be a secondary rate and volume tobe infused set. If this turns out to be the case, then the interface will direct theuser through entering both a primary rate and volume to be infused as well as asecondary rate and volume to be infused before they will be allowed to startthe infusion. A similar software limitation can be used to ensure that the userdoes not run a secondary infusion without a primary infusion set, if this isdetermined to be a problem.15
Top Level MenuSetting infusionrates returnsuser to toplevel menuwhere [START]and [STOP]options arenow availablePrimary Rate (mL/hr)Primary VTBI (mL)[SET][START] PrimaryInfusionSecondary Rate (mL/hr)Secondary VTBI (mL)[SET][START]Secondary Infusion[STOP] InfusionOptionHighlightedand SelectedOptionHighlightedand SelectedSelection MenuSet rate digit by digit(Use arrow keys andOK)Confirm input byactively selecting [YES]Set VTBI digit by digit(Use arrow keys andOK)Confirm input byactively selecting [YES]Total Volume Infused[CLEAR]OptionHighlightedand SelectedConfirm wish to clear volumeinformation by actively selecting[YES]Figure 2.1.1.6: Software ArchitectureThe third window available on the graphic user interface will be the total volumeinfused window. This window will display a running tally of the total volumeinfused. This can be done by continuously probing the total volume infusedfunction on the infusion pump. The running tally may need to be modified if itbecomes apparent that constant probing of the function adversely affectsinfusion pump operation. At this point it will be changed to an on demandinformation source that the user can select and view. In either case, selectingthe window will give the user the option to clear the total volume infused, viaconfirmation similar to that used with other inputs.The current button layout provides for a back button. This button will stepsequentially back through all possible selectable domains. For example, whenentering the volume to be infused, the back button will step back through eachdigit and then back to the infusion rate entry point before returning to the toplevel of the graphic user interface. This may prove to be tedious for somepatients, to the addition of a ‘return to main menu’ button may be considered.There are many alarms that are generated by the infusion pump. These alarmsmust be conveyed through the interface in order to assure accessibility. Most ofthe alarms, such as ‘Air in Line’ or ‘Door Open’ can simply be presented with theinterface’s enhanced visual and auditory outputs. Other alarms, such as‘Primary Rate = 0’ or ‘Secondary VTBI = 0’ can be eliminated all togetherthrough software. By not allowing the patient to begin infusion until all necessarydata is entered, the infusion pump will never need to generate these alarms.16
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Page 15: Circuit ElementsThe physical link b
Page 19 and 20: misdosages is reduced by forcing th
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Page 29 and 30: Figure 2.2.2.1.2: LCD DimensionsTab
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Page 51 and 52: Audio Output: “Infusion Rate Inpu
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Page 57 and 58: Audio Output: “Infusion Rate Inpu
Page 59 and 60: Audio Output: “Flow rate is” Ou
Page 61 and 62: Audio Output: “Infusion starting
Page 63 and 64: Figure 2.2.2.10.2: Labview-base Bla
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Figure 2.3.3: Opening the Pumping U
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Figure 2.3.5: Back Panel Dismounted
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Figure 2.3.8: Connecting the Power
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The metal arm connecting the two mo
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Figure 2.3.13: Two of the Six Bolts
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LCD DisplayButtonJoystickFigure 2.3
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Figure 2.3.18: Charger and Female C
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BatteryFigure 2.3.21: BatteryFigure
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Figure 2.3.24: Pumping Unit Connect
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12 Appendix12.1 Updated Specificati
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