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

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Health and safety constraints implemented on the user-interface are welldesigned by the Food and Drug Administration (FDA). Listed below are the “Ruleof Thumb” for health and safety constraints on controls/displays on userinterfacesdesigned by the FDA in [1], which will be considered for our finalproject design.• Make all facets of design as consistent with user expectations as possible. Boththe user’s prior experience with medical devices and well-establishedconventions are important considerations.• Design workstations, controls, and displays around the basic capabilities of theuser, such as strength, dexterity, memory, reach, vision, and hearing.• Design well-organized and uncluttered control and display arrangements.Ensure that the association between controls and displays is obvious. Thisfacilitates proper identification and reduces the user’s memory load.• Ensure that the intensity and pitch of auditory signals allow them to be heardeasily by device users. Consider the effects of ambient noise.• Ensure that the brightness of visual signals is sufficient to be perceived byusers working under various conditions of ambient illumination. Also, brightnesscontrast and color contrast can help to optimize legibility.• Make labels and displays so that they can be easily read from typical viewingangles and distances. Symbol size, contrast, color, and display depth areimportant considerations.• Ensure that the abbreviations, symbols, text, and acronyms placed on, ordisplayed by, the device are also used consistently in the instructional manual.They also should correspond to standard nomenclature, if possible.• Design control knobs and switches so that they correspond to the conventionsof the user population (as determined by user studies and existing medicaldevice standards).• Arrange and design knobs, switches, and keys in a way that reduces thelikelihood of inadvertent activation.• Space keys, switches, and control knobs sufficiently apart for easymanipulation. This will also reduce the likelihood of inadvertent activation.• Make sure that controls provide tactile feedback.As for software design, users can become frustrated by cumbersome data entrysteps and make errors not directly related to those steps, thus leading todetrimental health and safety risks. Listed below are the “Rule of Thumb” forhealth and safety constraints on software design on user-interfaces designed bythe FDA in [1], which will be considered for our final project design.• Be consistent and unambiguous in the use and design of headings,abbreviations, symbols, and formats.• Always keep users informed about current device status.• Provide immediate and clear feedback following user entries.• Design procedures that entail easy-to-remember steps.• Use prompts, menus, etc. to cue the user regarding important steps; do not97
"strand” the user.• Give users recourse in the case of an error. Provide conspicuous mechanismsfor correction and troubleshooting guides.• Do not overload or confuse users with information that is unformatted, denselypacked, or presented too briefly.• Consider the use of accepted symbols, icons, colors, and abbreviations toconvey information reliably, economically, and quickly.• Do not over use software when a simple hardware solution is available, e.g., astand-alone push button for a high priority, time-driven function.• Consider using dedicated displays or display sectors for highly criticalinformation. In such cases, do not display other data in these locations.Alarms provided by the user-interface should be greatly considered in warningpatients and/or users from health and safety risks. Listed below are the “Rule ofThumb” for health and safety constraints on alarms on user-interfaces designedby the FDA in [1], which will be considered for our final project design.• Be sure that visual and auditory alerts and critical alarms are included in thedesign requirements for the device.• Carefully consider the effects of over-sensitivity, electromagnetic interference,and static electricity on alarm functioning.• Design alarms so they meet or exceed normal hearing and visual limits of thetypical user.• Make sure that both brightness contrast and color contrast are sufficient forlegibility under a variety of lighting conditions.• Use codes, such as color, that correspond to established conventions.• Design alarms to be distinguishable from one another and, to the extentpossible, from alarms on other devices used in the same setting.• Design alarms to activate immediately following the onset of a critical problem.It is important that alarms identify the source of the problem.• Consider giving a priority status to critical alarms. Critical alarms should provideredundant auditory and visual signals.• Design alarms so that when they are silenced, they remain silent temporarily.They ideally will have visual indicators to indicate status and a mechanism forquerying the reason for the alarm.Economic constraints should also be considered with the patient and/or user inmind. The device is a supplemental design that adheres to a standardvolumetric infusion pump which some health insurance may or may not cover.The purchase of an infusion pump is substantial and range between at least$1,000 to $6,000. Nonetheless, the final infusion pump user-interface should notfurther hinder the patient from purchasing the device. The final design will berelatively inexpensive compared to a standard infusion pump and the purchaseof a user-interface should be supplementary with the infusion pump with anadditional price for supporting the device. However, insurance coverage should98
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e connected to the microprocessor r
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acket will be mounted directly to t
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Circuit ElementsThe physical link b
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Top Level MenuSetting infusionrates
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misdosages is reduced by forcing th
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Figure 2.1.2.7: Graphic User Interf
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Figure 2.1.3.2: Engineering drawing
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Figure 2.1.3.4: Labview-base Blackf
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Figure 2.2.1.1: Basic Circuit Desig
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Figure 2.2.2.1.2: LCD DimensionsTab
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Figure 2.2.2.2.2: Engineering drawi
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Figure 2.2.2.4.1: Rechargeable Lead
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It is important that operation of t
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Specifications (Note: dimensions in
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Figure 2.2.2.6.2: Bracket top view
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On the casing that will contain the
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Figure 2.2.2.6.9: Casing mounting b
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death. This makes the auditory outp
Page 47 and 48: Figure 2.2.2.8.1: Basic Circuit Des
Page 49 and 50: Figure 2.2.2.9.1: Display Screen Fl
Page 51 and 52: Audio Output: “Infusion Rate Inpu
Page 53 and 54: Audio Output: “Flow rate is” Ou
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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
Page 65 and 66: Figure 2.2.2.11.2: ABS Weld-On glue
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Page 69 and 70: Figure 2.2.2.12.1: Pump head assemb
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Page 73 and 74: Table 2.2.2.13.1: Specifications fo
Page 75 and 76: Figure 2.2.2.14.2 TM4500 dimensions
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Page 79 and 80: Figure 2.3.3: Opening the Pumping U
Page 81 and 82: Figure 2.3.5: Back Panel Dismounted
Page 83 and 84: Figure 2.3.8: Connecting the Power
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Page 87 and 88: Figure 2.3.13: Two of the Six Bolts
Page 89 and 90: LCD DisplayButtonJoystickFigure 2.3
Page 91 and 92: Figure 2.3.18: Charger and Female C
Page 93 and 94: BatteryFigure 2.3.21: BatteryFigure
Page 95 and 96: Figure 2.3.24: Pumping Unit Connect
Page 97: Figure2.3.26: DriverTesting of the
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Page 111 and 112: http://www.metalsdepot.com/products
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