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F7ABBPNK - Design and Construction of Medical Devices/Practical Exercises

Code Completion Credits Range Language
F7ABBPNK KZ 4 4L English
Enrollement in the course requires an successful completion of the following courses:
Electrical Measurements (F7ABBEM)
Electronic Circuits (F7ABBEO)
Sensors in Medicine (F7ABBSM)
Lecturer:
Tutor:
Supervisor:
Department of Biomedical Technology
Synopsis:

The aim of the practically oriented course is to acquaint students with the design process of the measuring part of the device, ie basic problem analysis, determination of functional blocks and their design, selection of suitable components and their values ​​with emphasis on working with catalog sheets and application recommendations, preparation of electrical documentation and board design. printed circuit board, its mounting, soldering and revitalization. During the course, students will implement a functional device (mounting, soldering, recovery) electronic thermometer, which will consist of two functional units - analog part for temperature measurement and signal conditioning (equipped with THT components) and display element with diode bargraph (equipped with SMT components ). For both products, students will implement the design of the diagram and PCB in the CAD environment EAGLE. In addition to the analog part of the device, an application for digitizing data from the analog device using NI-DAQ cards and a cheap solution with the help of Arduino will be implemented. The last part will be a service intervention in the device (monitor of vital functions) with emphasis on safe handling and measurement of test points.

Requirements:

Schematic orientation and knowledge of basic calculations in the circuit - passive components (resistive divider, RC and RL units, resistive bridge), active components (diodes and Zener diodes), operational amplifiers (connection as a tracker, inverting and non-inverting amplifier, differential amplifier and instrument amplifier). amplifier). Basic knowledge of working with laboratory instruments - digital multimeter (measuring parameters U, I, R), laboratory source (setting voltage and current limit), oscilloscope (manual setting of parameters - range, time base, triggering) and signal generator.

The course ends with a graded credit. Three continuous tests during the semester, focusing on the material covered, test composition: numerical example with the need to read parameters from the component catalog sheet, design of a wiring diagram with a selection of components from a defined series and theoretical questions with one correct answer. Students can get additional bonus points beyond the tests for the design, implementation and revitalization of their own PCB necessary for the implementation of the task within the teaching. The final evaluation is given by the sum of points from individual tests and possible bonus points. The final grade is given by the ECTS scale.

Evaluation of individual parts: 15 points numerical example, 15 points creation of a scheme and 2 points per question, ie a total of 10 points for questions, a total of 40 points for a test.

The final grade will be given by the total number of points obtained from both tests. No correction date will be implemented due to the fact that it is possible to obtain up to a total of 120 points.

The point minimum is 50 points, ie mark E, the maximum is 100 points, according to CTU classification scheme.

Syllabus of lectures:

Course has no lectures.

Syllabus of tutorials:

Exercises take the form of 4 hour blocks

1. Problem analysis (electronic thermometer with NTC), design of functional block connections (connection of resistive thermometer to divider and bridge, power supply and voltage reference, amplification), choice of components based on calculation and availability from the series, work with catalog sheet

2. Verification of the proposed connection (electronic thermometer with NTC) and its stability in a non-soldering field.

3. Schematic design in EAGLE environment, choice of components and packages, circuit simulation in Multisim environment (SPICE).

4. PCB design in EAGLE environment, methods of manual component layout, autorouting and manual path guidance, export for production.

5. PCB production by photo path, PCB mounting and soldering of THT components - thermometer board with NTC

6. Revitalization of the produced board, measurement at nodal points, fault finding, measurement of transmission characteristics.

7. Manual soldering of SMT components, application of solder paste through the mask, mounting and remelting, optical analysis of soldering - imaging element board to the thermometer.

8. Recovery and testing of the activated set (thermometer board and display element board), use of the system for automated tests TestStand in combination with a data card for verification of operation in different conditions and stress test (simulation of different temperatures, different battery voltages)

9. Creation of a measuring application in the LabVIEW environment for digitization of data from a manufactured jig using an NI-DAQ industrial converter.

10. Digitization using available solutions (Arduino) and data display in the terminal and LabVIEW

11. Connection of instrument amplifier for sensing biopotentials - ECG, EMG and EOG, data digitization

12. Signal amplification from electrochemical sensors - pH and conductivity, temperature compensation, detection of maximum peaks.

13. Service intervention in the monitor of vital functions, safety during handling and use of isolating transformer, analysis of function blocks, measurements on test nodes for setting operating values, assembly of the device and verification of operation

14. Consultation of the subject, reserve for additional assessment of tasks, graded credit.

Study Objective:

Orientation in technical documentation (data and sheets, application recommendations); design of electrical documentation in the EAGLE environment (electronic diagram and printed circuit board); PCB production; soft soldering of THT and SMT components; safe ESD work; implementation of a simple application for signal digitization based on NI-DAQ and Arduino in the LabVIEW environment and data export; service intervention in the device (analysis of functional blocks, safety during handling, measurement at test points)

Study materials:

[1] Medical instrumentation: application and design. 4th ed. Editor John G. WEBSTER. Hoboken, N.J.: Wiley, c2010. ISBN 9780471676003.

Note:
The course is a part of the following study plans:
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