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

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OKBACKOKThe layout and function of buttons should beas intuitive as possible. Much can belearned from the plethora of handheldelectronics with which people work daily.The iPod digital music player, for instance,has only five buttons in addition to a scrollwheel. The use of these buttons to navigatethe device is easily learnable. Along theselines, the number of buttons on the infusionpump interface should be kept to aminimum. Well designed functionarchitecture can reduce the number ofneeded input buttons to as few as three.Figure 3: Possible Button LayoutsTwo buttons, an up and a downbutton for instance, would bedesignated for navigation withinthe menus of the device as well asselecting digits for dosing levels. Athird button would be used toselect a highlighted function orconfirm and entry into the system.A fourth button with the functionof ‘cancel’ or ‘back’ could alsobe implemented in lieu of a‘back’ option at the bottom ofevery menu. This decision must bemade based on menu length andthe number of menus needed. Aback button, bringing the total tofour input buttons, would not overcomplicated things and maymake the device easier to use.InterfaceMounting ArmInterfaceIV StandInfusion PumpFigure 4: Pole-mounted InterfaceThe necessity of accessibility putsseveral constraints on the design. Physically, the device must be relatively smalland light. Patients using infusions pumps are often elderly or weakened by theirillnesses. A device that they can maneuver around their home is needed. Inaddition to being light and small enough to be moved, the interface must alsobe mounted in a useful location. Many infusion pumps are mounted to thepoles of IV stands. This should therefore, be an option for the interface. One11
possible problem with this is that the many tubes running to and from the infusionpump itself may interfere with access to a pole-mounted interface. To workaround this, a pole mounting arm of some sort may be considered in the design(Figure 4).As most infusion pumps are battery operated, the interface should also be.Having a battery operated device places several limitations on design. Thevisual display is likely to be the main power draw, especially considering that ismust be very bright to increase visual accessibility. The screen should thereforebe efficient. An LCD would be the most power conservative. A dimming optionwill also be considered to allow for longer life if the full brightness is not requiredby the patient. A screen saver function could also be employed if a displaysuch a color LCD panel is used.For the interface to be accessible, it must be easily maintained. The batteryitself should be easily accessible and require only moderate force and dexterityto remove. The simple the battery removable, the more easily the patient canuse the device. Ideally the device would not need to be dismounted to removethe battery.As mentioned above, the second major function of the infusion pump interfaceis to ensure the patients’ safety by preventing incorrect dosing. This can beaccomplished in a variety of ways. The most basic safety feature is making surethat a dosage was not entered incorrectly. This can be done by simplyreviewing the entered data for the patient. Using both visual and auditoryinterfaces the device should recount the selected dose and schedule in orderto allow the user to catch and correct any mistake that he or she may havemade. Confirmation of the dosing should be failsafe. The user should be askeda question along the lines of “Is this correct?” with the ‘No’ answer highlighted.The patient must then select yes and confirm. This way, the patient is madeaware of what the device has received for data.A method that is even more error-free may be available. There exist barcodesystems which identify the drug name and concentration. If this system isnonproprietary, it may be possible to include a laser scanner on the interface.The patient would simply have to scan the barcode and the dose and dosingschedule would be entered into the device automatically. At the very least, thedrug name and concentration would be reported to the user so as to ensurethat the infusion pump is being loaded with the proper medication.Another way to reduce patient error is to allow dosing protocols to be saved. Ifa patient is on a standard drug regimen, there is no need to reenter the samedosing requirements every time a new vial is inserted. Allowing a protocol to besaved and reloaded will decrease the chance of high- or low-dosing.12
Page 1 and 2: Project ProposalAccessible Infusion
Page 3 and 4: Table of ContentsSectionPage Number
Page 5 and 6: to correctly operate the device. Th
Page 7 and 8: Cardinal Health - Alaris®, Alaris
Page 9 and 10: Faeser , et al. being the most rele
Page 11: interface is intended to increase t
Page 15 and 16: ItemRetail Value inMarketEstimated
Page 17 and 18: ReferencesBrixey, Juliana. "AMIA 20
Page 19 and 20: Karin Garmer 1 , Erik Liljegren 1 ,

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