“Cherry Picker” Blake Hondl, Amit Mehta, Jon Millin, Ryan Pope Advisor: Professor Tompkins BME 301 Spring 2004
Client l l Noël R. Peters, M. S. Keck-UWCCC Small Molecule Screening Facility
Overview l l l Problem Statement Background Design Constraints Design Alternatives Proposed Design Future Work
Problem Statement l A device to guide a micropipette user in the transfer of small volumes of compounds between 384 -well micro liter plates. The device will increase the efficiency of transfers and reduce user error.
384 -Well Plate
Background l Drug-like chemicals l l used in biological assays Substance tested against 36, 000 known chemicals Chemical mixed with reagents in microliter wells Biomek® FX Laboratory Workstation
Background l l l Well plates loaded into plate reader Typically 1 -4 wells meet the absorbance, fluorescence or luminescence requirements, known as “hits” “Hits” are retested En. Vison® Plate Reader
Design Constraints l l l Must interface with Microsoft Excel Effectively guide the user to the appropriate wells Minimize required bench space Withstand exposure to various chemicals and reagents Lightweight and inexpensive (<$1000)
Current Competition l Matrix Memowell® – – – 96 well pipetting aid Lights up 4 wells when used with 384 -well plate Costs approx. $1000 l Quadra Cherry Picker – – Automated Costs $150, 000 http: //www. matrixtechcorp. com http: //www. tomtec. com
Computer Interface l l Client uses a Dell PC with Windows® XP Use a port to connect device to PC – – l Monitor (VGA) port USB or serial port Send data through port to device http: //www. dell. com
Software l Choose a programming language – – l Choose a programming environment and compiler to create application – – l Java C++ Microsoft® Visual® Metrowerks™ Code. Warrior™ Application will take input from user and Excel file
Proposed Designs l 384 Fiber Optic Array l 384 LED Array l LCD Screen
Fiber Optics l l l 384 individually controlled fibers Low intensity light Very small light source www. fiberopticproducts. com
384 LED Array l l l Similar to Memowell device Microcontroller interfaced with a Computer 384 surface mount LED’s Light up both row and column High intensity light source http: //www. globalspec. com
LED Schematic
Proposed Solution l LCD screen to show output of application – – l 2 wells fixed in place on screen Lines (cross-hairs) displayed to identify wells to user Application – Takes input from both an Excel file listing “hits” and user Picture of 384 well plate on lcd screen of a laptop.
Decision Matrix Fiber Optic LED LCD Feasibility 3 2 1 Cost 2 2 3 Ease of use 3 2 1 Manufacturing (labor) 3 3 1 Adaptability 3 3 1 Average score 2. 8 2. 4 1. 4 Good Better Best
Future Work l l l Connect LCD screen through external port Determine best platform for implementation Experiment with output to LCD screen Determine necessary output for every well Write code to illuminate proper wells for all possible combinations Construct user interface
Any Questions?
References l l “LCD Basics: Monitor Technology 101. ” View. Sonic. http: //www. viewsonic. com/monitoruniversity/lcdbasics. htm “LCD Video Controller. ” Subassembly Product Guide. http: //www. trans 2000. com/manual/adboard_manual. pdf “Product Specification for LB 104 V 03 Liquid Crystal Display. ” Products Engineering Dept. LG. Philips LCD Co. , Ltd. http: //www. jacoflatpanels. com/lcdpdfs/LB 104 V 03 A 1_CAS(Ver 0. 1). pdf “Java Excel API Tutorial”. http: //www. andykhan. com/jexcelapi/tutorial. html
Conclusion: LCD Device l Because of labor savings over soldering 768 individual LED’s (384 wells per plate times 2 plates) and because of the rapid adaptability of an LCD by the implementation of new programming, it was decided to pursue the LCD screen design further.
LCD Design l LCD contains: – – – One or more cold cathode fluorescent lamps (CCFL) Liquid crystal grid Controlling circuitry l l l Video receiver circuit LCD driver circuit Inverter
System Diagram
Typical LCD Schematic
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