Wearable biomedical devices
pulse rate monitors
low-cost and small devices
Important design requirements for these systems include miniaturization, robustness and user-friendliness.
These devices have a sensor that monitors minor variations in the intensity of light transmitted through or reflected from the tissue.
2. Wearable biomedical devices
• pulse rate monitors
• low-cost and small devices
• Important design requirements for these systems include miniaturization, robustness
and user-friendliness.
• These devices have a sensor that monitors minor variations in the intensity of light
transmitted through or reflected from the tissue.
4. Holter device
• In medicine, a Holter monitor (often simply Holter) is a type of ambulatory
electrocardiography device, a portable device for cardiac monitoring (the monitoring
of the electrical activity of the cardiovascular system) for at least 24 to 72 hours (often
for two weeks at a time).
Ritim BozukluklarıTeşhisi: Holter
Nedir? (neyedenir.com)
5. Working
• size is small
• several wires are attached to the monitor
• wires or leads are connected to electrodes that are placed on the skin on your chest
with a gel
• The metal electrodes conduct your heart activities through the wires and into the
holter monitor, where its record
6. Procedure
• Prepare your skin for the electrode
• Always wear the monitor
• Record activities in the diary
• Avoid things that create interference
7. ECG
• An electrocardiogram records the electrical signals in your heart. It's a common and
painless test used to quickly detect heart problems and monitor your heart's health.
Ekg Monitor Stok Fotoğraflar &Yoğun Bakım
Ünitesi‘nin Daha Fazla Resimleri - iStock
(istockphoto.com)
8. Identify the Problem
ischemic heart muscle (heart muscle getting low blood flow)
damaged heart muscle
enlargement of the heart
irregular heart beats or rhythms
previous heart attacks
abnormal amounts of potassium in the blood
congenital heart disease (heart disease present at birth)
problems with heart valves.
9. working
• small electric current
• For a resting electrocardiogram
• The electrode picks up the current and transmit them to an amplifier inside the
electrocardiograph.
• In an electrocardiograph, a sensitive lever traces the changes in current on a moving
sheet of paper.
• It is connected to an oscilloscope.
10. Application
• pattern of contraction of heart
• condition of heart muscle
• the heart condition is normal or not.
• reveal irregularities in heart’s rhythm
• It is used by doctors to diagnose heart damage
12. Photoplethysmography
It determination in which the intensity of light reflected from the skin surface and the red cells below is
measured to determine the blood volume of the respective area.
There are two types
• transmission
• reflectance.
Pulse oximiter,
Photoplethysmograph -
Photoplethysmogram -Wikipedia
13. Uses of PPG
• Medical devices based on PPG technology are widely used in various applications in the clinical set up.
• Specific applications include the following:
• Clinical physiological monitoring
• Blood oxygen saturation
• Blood pressure
• Cardiac output
• Heart rate
• Respiration
14. Uses of PPG (Cont.)
• Arterial compliance and ageing
• Venous assessment
• Endothelial function
• Microvascular blood flow
• Vasospastic conditions
• Autonomic function monitoring
• Vasomotor function and thermoregulation
• Blood pressure and heart rate variability
• Orthostasis
• Other cardiovascular variability assessments
15. Principle of PPG
• low-intensity infrared (IR) light.
• light is more strongly absorbed by blood than the surrounding tissues.
• The voltage signal from PPG is proportional to the quantity of blood flowing through the blood vessels.
• A PPG signal has several components including volumetric changes in arterial blood which is
associated with cardiac activity.
• Some major factors affecting the recordings from the PPG are site of measurement and the contact
force between the site and the sensor.
• Blood flow variations mostly occur in the arteries and not in the veins.
