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

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not be limited to the user-interface, but only for the infusion pump asappropriate for the patient.Since home infusions occur inside the house within modest conditions, thepump’s operating temperature will be between thirty two degrees Fahrenheitand one hundred and five degrees Fahrenheit. The dust within the house shouldbe lower than ten parts per million in order to not effect the interfacesfunctionality.Further environmental restraints are focused more towards disposal andenvironmentally friendly materials than the interface’s functioning environment.These types of regulations include the Restriction of Hazardous SubstancesDirective (RoHS), which limits the levels of lead, mercury, cadmium, hexavalentchromium, polybrominated biphenyls, and polybrominated diphenyl ether inproducts for sale in countries within the European Union and the Waste Electricaland Electronic Equipment Directive (WEEE) which attempts to limit wastecreated by the expanding field of technology and electrical components byplacing the responsibility of discarding products on the manufacturer. Since ourinterface won’t be mass produced, the directives don’t play an important rolein creating the circuitry but the parts market has definitely been altered sincethe induction of these directives.4 Safety IssuesThe interface that is being designed is for the majority, an electrical product. Thismeans the design with respect to safety will go into protecting the user from theelectrical components and the current that will be traveling through them.The complete interface will be encapsulated inside plastic which will be gluedand screwed together. Without removing the screws, the main body of theinterface will protect the average user from the majority of the electrical riskwhile the interface is in use. To avoid bare wires, the bracket that will bemounted to the back of the interface will sit flush and also be screwed into themain body. This will eliminate another area where electrical components couldbe exposed. Another area of risk will be the actual connection to the infusionpumping mechanism.Along with keeping bare wires to a minimum, our group will need to designaround spark risks that can lead to explosions. This risk is high because whenmedical equipment is in an oxygen or another flammable medical gasenvironment a simple spark can be a disaster. This will be accomplished by usingpreprinted circuit boards to keep sparks at contact points eliminated. Also, hot99
surfaces and electric static discharge will be eliminated by choosing theappropriate circuit components.As the device will be operating in a home environment, dust becomes aconcern. Human beings shed cells at rapid rates, filling the air will particles that,when accumulated, can interfere with the proper operation of the interface. Totake measures against this, all cracks in the unit must be sealed with gaskets.The seals need not be air tight, but simply barriers to particulate matter enteringthe confines of the device. Simple filters on any fan unit will also aid inminimizing dust interaction with the device.Since infusions are associated with a liquid, the interface must be able to besafe for patients with damp or slightly moist hands. Electrically safe buttons canbe designed that have tight tolerances to the gap in the interface will minimizethe chance that liquid can enter the interface. A better design solution that willbe implements will be to have a plastic or laminate sheet over the entireinterface. By placing a non-porous plastic over the interface the liquid won’t beable to penetrate into the body that houses the electronics.The mechanical risks for our interface aren’t quite as important as the electricalbut still will play a factor into the completed design. To provide a stableinterface for the clients with dexterity problems, the flexible arm will need to bestrong enough to hold its own weight along with the force from pressing buttons.If the flexible arm is too ‘soft’ when the buttons are pressed the interface willmove backwards which will allow the possibility for an incorrect input. In casethe patient is mobile with their infusion system, the interface has the chance ofinadvertently moving which poses an impact risk. This means the flexible arm willneed to be stiff enough to be able to withstand vibration when the IV pole isbeing transported to a new area without swinging. Also associated with animpact risk would be the clamp to the IV pole loosening throughout use andeventually falling. To reduce this risk, the clamp will be given rubber backing toallow for a better contact to be made with the metal IV pole. When theinterface and pumping mechanism is added to the IV pole the center of gravityof the overall system could possibly be raised. By raising the center of gravity theIV pole will be more likely to fall over. However, this can be alleviated byincluding instructions with the interface that it should have it’s mounting pointlower rather than higher on the IV pole. Lastly, the buttons on the interfacecould stick while in use leading to improper dosages or worse, not being able touse the system completely. By using an appropriate spring rate to return thebuttons back to their resting points the buttons have less of a chance to getstuck. This can also be fixed by using buttons that are dome switches. Thesewould have less friction because they aren’t sliding directly on into the plasticcutouts in the main body.100
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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
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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
Page 65 and 66: Figure 2.2.2.11.2: ABS Weld-On glue
Page 67 and 68: Figure 2.2.2.11.6: User Interface U
Page 69 and 70: Figure 2.2.2.12.1: Pump head assemb
Page 71 and 72: 2.2.2.13 Anaheim Automation PCL601
Page 73 and 74: Table 2.2.2.13.1: Specifications fo
Page 75 and 76: Figure 2.2.2.14.2 TM4500 dimensions
Page 77 and 78: The interface must also be evaluate
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
Page 85 and 86: The metal arm connecting the two mo
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 and 98: Figure2.3.26: DriverTesting of the
Page 99: "strand” the user.• Give users
Page 103 and 104: through all necessary steps before
Page 105 and 106: Adding new components has brought w
Page 107 and 108: The next step was creating the all
Page 109 and 110: With the integration of a colored L
Page 111 and 112: http://www.metalsdepot.com/products
Page 113: 12 Appendix12.1 Updated Specificati
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