BIOLOGY FOR ENGINEERS
(24SZT-148)
Unit 2 Descriptive Notes
Unit 2 Syllabus ::
Compiled by : Subhayu
,Chapter 1: Medical Instrumentation
1. Introduction to Medical Instrumentation
Medical Instrumentation refers to the design, development, and application of
instruments used in diagnosing, monitoring, and treating medical conditions.
These instruments con vert biomedical signals into measurable electrical
signals for analysis.
2. Sources of Biomedical Signals
Biomedical signals originate from different physiological activities in the
human body. These can be:
A. Bioelectric Signals
● Generated by electrical activity of cells
● Examples:
○ ECG (Electrocardiogram): Heart’s electrical acti vity
○ EEG (Electroencephalogram): Brain wa ves
○ EMG (Electromyogram): Muscle contractions
B. Biomechanical Signals
● Signals based on mechanical activity
● Examples:
○ Blood Pressure (BP): Force exerted by blood
○ Respiratory Rate: Expansion & contraction of lungs
C. Biochemical Signals
● Chemical concentration-based signals
● Examples:
, ○ Blood glucose level
○ pH level of blood
D. Biothermal Signals
● Body heat variations
● Example: Body temperature monitoring
3. Basic Medical Instrumentation System
A medical instrumentation system consists of multiple components working
together to process biomedical signals.
Components:
1. Sensor (Transducer): Con verts a biomedical signal into an electrical
signal
2. Signal Conditioning Unit: Amplifies, filters, and con verts signals
3. Display Unit: Visualizes processed data (Monitors, LEDs)
4. Recording & Storage Unit: Stores data for future analysis
5. Control Unit: Adjusts and controls instrument parameters
🔹 Example: In an ECG machine, electrodes (sensor) capture heart signals,
which are then amplified, filtered, and displayed as ECG wa ves.
4. Performance Requirements of Medical
Instrumentation System
A medical instrument must meet se veral performance criteria to ensure
accuracy and reliability:
A. Accuracy
, ● The instrument should provide cor rect measurements with minimal
error.
B. Sensitivity
● The ability to detect even small physiological changes in the patient’s
body.
C. Linearity
● Output should change proportionally to the input.
D. Stability
● The system should provide consistent and repeatable results over time.
E. Safety
● Medical instruments must not harm the patient (e.g., electrical safety in
ECG machines).
F. Response Time
● The instrument should quickly process and display readings (c ritical in
emergency cases).
5. Microprocessors in Medical Instruments
Mic roprocessors control medical instruments by processing data and
generating responses.
🔹 Applications:
● ICU Monitors: Continuously monitor patient vitals
● Infusion Pumps: Control drug deli very rates
● Portable ECG Machines: Store and analyze heart data
(24SZT-148)
Unit 2 Descriptive Notes
Unit 2 Syllabus ::
Compiled by : Subhayu
,Chapter 1: Medical Instrumentation
1. Introduction to Medical Instrumentation
Medical Instrumentation refers to the design, development, and application of
instruments used in diagnosing, monitoring, and treating medical conditions.
These instruments con vert biomedical signals into measurable electrical
signals for analysis.
2. Sources of Biomedical Signals
Biomedical signals originate from different physiological activities in the
human body. These can be:
A. Bioelectric Signals
● Generated by electrical activity of cells
● Examples:
○ ECG (Electrocardiogram): Heart’s electrical acti vity
○ EEG (Electroencephalogram): Brain wa ves
○ EMG (Electromyogram): Muscle contractions
B. Biomechanical Signals
● Signals based on mechanical activity
● Examples:
○ Blood Pressure (BP): Force exerted by blood
○ Respiratory Rate: Expansion & contraction of lungs
C. Biochemical Signals
● Chemical concentration-based signals
● Examples:
, ○ Blood glucose level
○ pH level of blood
D. Biothermal Signals
● Body heat variations
● Example: Body temperature monitoring
3. Basic Medical Instrumentation System
A medical instrumentation system consists of multiple components working
together to process biomedical signals.
Components:
1. Sensor (Transducer): Con verts a biomedical signal into an electrical
signal
2. Signal Conditioning Unit: Amplifies, filters, and con verts signals
3. Display Unit: Visualizes processed data (Monitors, LEDs)
4. Recording & Storage Unit: Stores data for future analysis
5. Control Unit: Adjusts and controls instrument parameters
🔹 Example: In an ECG machine, electrodes (sensor) capture heart signals,
which are then amplified, filtered, and displayed as ECG wa ves.
4. Performance Requirements of Medical
Instrumentation System
A medical instrument must meet se veral performance criteria to ensure
accuracy and reliability:
A. Accuracy
, ● The instrument should provide cor rect measurements with minimal
error.
B. Sensitivity
● The ability to detect even small physiological changes in the patient’s
body.
C. Linearity
● Output should change proportionally to the input.
D. Stability
● The system should provide consistent and repeatable results over time.
E. Safety
● Medical instruments must not harm the patient (e.g., electrical safety in
ECG machines).
F. Response Time
● The instrument should quickly process and display readings (c ritical in
emergency cases).
5. Microprocessors in Medical Instruments
Mic roprocessors control medical instruments by processing data and
generating responses.
🔹 Applications:
● ICU Monitors: Continuously monitor patient vitals
● Infusion Pumps: Control drug deli very rates
● Portable ECG Machines: Store and analyze heart data
