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To design a device that can pump 3 microliters of saline into a catheter within 5 ms for stiffness measurements at different cardiac cycles.
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Piezoelectric actuators are too expensive. We decided to use a linear actuator to build up hydraulic force in a syringe, and use a high performance solenoid valve to control flow from the syringe. A microfluidic solenoid valve with a spike and hold circuit for operation were ordered from the Lee Company. Initial tests at 15 psi reveal dispense rates close to the required. Future goals include finding an acurate pressure source, and devising a method for removing the dispensed volume.
VHS Solenoid Valve from The Lee Company
Control Circuit from The Lee Company
| Week | Reporting Period Beginning | Activities |
|---|---|---|
| 1 | September 9 | Contacted Client |
| 2 | September 16 | Meeting with client, developed PDS |
| 3 | September 23 | Brainstormed potential designs |
| 4 | September 30 | Planned paper and presentation, developed potential designs |
| 5 | October 7 | Worked on design alternatives, met with client |
| 6 | October 14 | Midsemester presentation, piezoelectric stack design chosen |
| 7 | October 21 | Calculate force required to inject fluid |
| 8 | October 28 | Choose piezoelectric stack with required specifications |
| 9 | November 4 | Analysis of chosen stack, and begin designing components |
| 10 | November 11 | Backup solenoid design chosen, Order solenoid from cole parmer |
| 11 | November 18 | Recieved solenoid valve, but wasn’t what we expected |
| 12 | November 25 | Research smaller solenoid valves |
| 13 | December 2 | Ordered VHS valve and spike and hold circuit from The Lee Company |
| 14 | December 9 | Assembling, testing and presentation |
| 15 | December 16 |
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Midsemester Report (Oct 17 2003, 748 kb) |
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Midsemester Presentation (Oct 17 2003, 796 kb) |
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PDS (Oct 19 2003, 43 kb) |
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Poster (Dec 9 2003, 3297 kb) |
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Final Paper (Dec 10 2003, 1269 kb) |
