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

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This increase in strength however causes a loss of inner diameter which couldrestrict the wiring that will be running through the arm.Text to Voice Unit:The interface’s text to voice unit is the crucial link to the project for our clientsthat suffer from visual disabilities. Without proper auditory cues, patients run therisk of delivering wrong dosing amounts which can cause serious harm or evendeath. This makes the auditory output from our interface a vital portion of thecorrect drug delivery interface system.Winbond currently produces the WTS701 which is a single chip, integrated circuitthat can convert text to speech. For our interface, we will be incorporating theParallax Emic Text-To-Speech Module that contains the Winbond WTS701. Byusing the module rather than design the circuit from the chip alone, our grouphas the complete hardware module that can convert the lines of text on theLCD into English. This design is also very small and includes the speaker neededfor the converted output which will allow for our design to meet its size andportability objectives.Figure 2.1.1.4: Emic module.The above pin descriptions show that the module only requires +5V DC forpower, contains both a serial in and out, and has pins for both positive andnegative speaker driver output. Also for the SIP version, there is an analog inputwhich will allow the module to receive audio signals. Even though the OEMconfiguration has a smaller output speaker, it will be the module integrated intoour design because we won’t need the analog input functionality.13
Circuit ElementsThe physical link between the infusion pump and the interface will ideally bedone via a serial bus. RS 232 seems like a likely candidate due to itspervasiveness and relative simplicity. The procured infusion pump is a Baxter FloGard® 6200 which has no serial bus outputs. If another pump with a serial portcannot be found, the Baxter Flo Gard ® 6200 must be dissected in order to installa port through which interfacing can be accomplished. Signals must bereceived from and sent to the infusion pump in a way that they are discernableby both devices. Figure 2.1.1.5 is a basic circuit element schematic. A morecomplex schematic cannot be generated until more is known about the dataprotocols of the infusion pump, as well as those of the visual display, buttons andtext-to-voice module. Essentially input signals will be generated by input buttonsand will be relative to what is on the display. This data will be processed by amicroprocessor into signals which the infusion pump can comprehend. Thesignals will then be transmitted via a serial bus to the infusion pump itself wherethey will result in action being taken, such as a flow rate being set or infusionbeginning. The system must also work in reverse. Warnings and statusinformation from the infusion pump must be transmitted along the serial bus anddisplayed visually and audibly.Visual DisplayText-to-VoiceModuleMicroprocessorSerial Bus<strong>Infusion</strong> <strong>Pump</strong>Control ButtonsFigure 2.1.1.5: Basic Circuit DesignOne disadvantage to the use of a microprocessor is that any graphics interfacemust be generated from scratch in assembly code. This can prove to be tediousand unnecessary given the many operating systems available with graphicsinterfaces already present. As more is learned about the protocols of the14
Page 11 and 12: e connected to the microprocessor r
Page 13: acket will be mounted directly to t
Page 17 and 18: Top Level MenuSetting infusionrates
Page 19 and 20: misdosages is reduced by forcing th
Page 21 and 22: Figure 2.1.2.7: Graphic User Interf
Page 23 and 24: Figure 2.1.3.2: Engineering drawing
Page 25 and 26: Figure 2.1.3.4: Labview-base Blackf
Page 27 and 28: Figure 2.2.1.1: Basic Circuit Desig
Page 29 and 30: Figure 2.2.2.1.2: LCD DimensionsTab
Page 31 and 32: Figure 2.2.2.2.2: Engineering drawi
Page 33 and 34: Figure 2.2.2.4.1: Rechargeable Lead
Page 35 and 36: It is important that operation of t
Page 37 and 38: Specifications (Note: dimensions in
Page 39 and 40: Figure 2.2.2.6.2: Bracket top view
Page 41 and 42: On the casing that will contain the
Page 43 and 44: Figure 2.2.2.6.9: Casing mounting b
Page 45 and 46: 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
Page 55 and 56: Audio Output: “To start infusion,
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 2.2.2.11.2: ABS Weld-On glue
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Figure 2.2.2.11.6: User Interface U
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Figure 2.2.2.12.1: Pump head assemb
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2.2.2.13 Anaheim Automation PCL601
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Table 2.2.2.13.1: Specifications fo
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Figure 2.2.2.14.2 TM4500 dimensions
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The interface must also be evaluate
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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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Figure2.3.26: DriverTesting of the
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"strand” the user.• Give users
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surfaces and electric static discha
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through all necessary steps before
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Adding new components has brought w
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The next step was creating the all
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With the integration of a colored L
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http://www.metalsdepot.com/products
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12 Appendix12.1 Updated Specificati
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