This document describes an automatic anesthesia controller that uses a heart beat sensor. It uses a PIC microcontroller to control the flow of anesthesia to patients during surgery based on their heart rate, which is measured by a heart beat sensor. The system includes a syringe filled with anesthesia liquid that is injected into the patient's body using a stepper motor. The heart rate is monitored and used to control the stepper motor and injection of the liquid as needed.

1. ARM 7 PROCESSOR BASED - AUTOMATIC
ANESTHESIA CONTROLLER USING HEART
BEAT SENSOR
At the present time anesthetics, drugs which induce loss of
awareness, are often used for surgical operations. A general anesthetic
should cause a progressive depression of the central nervous system and
cause the patient to lose consciousness. In contrast, a local anesthetic will
affect sensation at the region to which it is applied.
To maintain an adequate depth of anesthesia without compromising
patient's health, an anesthesiologist usually works as a multi-task feedback
controller to roughly regulate the drugs titration while observing a variety
of patient outcomes. Automatic anesthesia controller design aims to
automatically regulate anesthesia levels by taking account on several
physiological measurements and then frees up anesthesiologists for more
important tasks in operation.
This project designed using the PIC Microcontroller aids in the
control of feeding Anesthesia for patients during Surgery times. This
project Consists of a Heart Beat sensor to detect the Heart beat rate and a
Mechanical Arrangement with syringe for feeding anesthesia to the
patients.
Operation:
First the Syringe is filled with anesthesia liquid and kept in
the mechanical arrangement. And the Heart beat rate is calculated. Then
the Liquid is slowly injected into patients body and the changes in the
Heartbeat rate is observed. Then according to the Heart beat rate the
Liquid is injected into the body.

2. The injecting process is controlled by the movement of the Stepper
Motor.
The Complete Status is Indicated in LCD with online Updations.
Hardware Requirements
1. PIC microcontroller PIC16F877
2. Heart beat Sensor
3. Power supply circuits
4. Stepper Motor Driver Circuits
5. Stepper Motor
6. Mechanical model constructed with syringe
Software:
1. Hitech C compiler
2. MPLAB IDE V6.0
Application:
1. Clinical applications
2. Operation Theaters
Advantages:
1. PIC Microcontroller based operation
2. Syringe can be pre adjusted to fill the anesthetic fluid
3. Stepper motor is used for taking accurate ml of the fluid
4. better than human control
5. Controlling Analgesia Level through Heart beat rate Analysis

3. BLOCK DIAGRAM
LCD Display
+5V
Power +12
Signal V
Supply ARM 7 Conditioning
PROCESSOR – Board
LPC2148 (Amplifier)
Heart Beat
Sensor
+12V Steppermotor
Power Driver
Supply
GND
Emitter
Stepper Mehanical
Motor Arrangment (Model)
Detector
Patients Finger

4. BLOCK DIAGRAM
LCD Display
+5V
Power +12
Signal V
Supply ARM 7 Conditioning
PROCESSOR – Board
LPC2148 (Amplifier)
Heart Beat
Sensor
+12V Steppermotor
Power Driver
Supply
GND
Emitter
Stepper Mehanical
Motor Arrangment (Model)
Detector
Patients Finger

5. BLOCK DIAGRAM
LCD Display
+5V
Power +12
Signal V
Supply ARM 7 Conditioning
PROCESSOR – Board
LPC2148 (Amplifier)
Heart Beat
Sensor
+12V Steppermotor
Power Driver
Supply
GND
Emitter
Stepper Mehanical
Motor Arrangment (Model)
Detector
Patients Finger

6. BLOCK DIAGRAM
LCD Display
+5V
Power +12
Signal V
Supply ARM 7 Conditioning
PROCESSOR – Board
LPC2148 (Amplifier)
Heart Beat
Sensor
+12V Steppermotor
Power Driver
Supply
GND
Emitter
Stepper Mehanical
Motor Arrangment (Model)
Detector
Patients Finger