User guide for the Fingertip Pulse Oximeter

Purpose of the Fingertip Pulse Oximeter

The Fingertip Pulse Oximeter is an innovative portable medical device for fast, accurate, and continuous non-invasive measurement of pulse rate and peripheral oxygen saturation of hemoglobin in arterial blood. (Oxygen saturation of hemoglobin in arterial blood is called saturation (SaO2). Values of SaO2 > 94% are considered normal. At lower values, oxygen therapy is recommended). The oximeter is designed for self-diagnosis of hypoxia at home.

Features and Main Functions

• Dual-color OLED display, multiple display modes
• Low power consumption, 4 display orientations
• Low battery indicator
• Easy operation with one button
• Automatic power-off after 8 seconds of inactivity
• Compact size, lightweight, portable

Functions of the Multifunction Button

• Power on the oximeter when off
• Change the display orientation when the device is on

Operating Instructions

1. Insert two AAA batteries into the compartment and close the cover.
2. Open the clamp, place one finger inside with the nail facing upward, then release the clamp.
3. Switch on the device by pressing the button.
4. Do not move your finger during operation. Body movement is not recommended.
5. Press the button to change the display orientation.
6. Read the values displayed on the screen.
7. If no signal is detected, the oximeter will switch off automatically.
8. Replace the batteries when the low battery indicator appears on the display.

Symbols and Their Meaning

	Type BF equipment (equipment with additional protection against patient leakage currents)
	Read the manual before use
	Peripheral oxygen saturation (SpO2) – hemoglobin oxygen saturation
	Heart rate (HR)
	Low battery indicator
	Serial number

Insert the finger into the pulse oximeter with the nail facing upward!

Note
Disinfect the rubber surface inside the pulse oximeter and the finger with medical alcohol before and after each measurement. (The rubber surface inside the pulse oximeter is non-toxic, does not cause allergies or other side effects).

Precautions for Using the Pulse Oximeter

1. Do not use the pulse oximeter together with MRI or CT equipment.

2. Explosion hazard: Do not use the device near open flames.

3. This pulse oximeter is an auxiliary tool for evaluating a patient’s condition. Only a physician can make an accurate diagnosis based on other symptoms and clinical tests.

4. Regularly check the patient’s skin condition at the sensor attachment site to avoid impaired blood circulation.

5. Do not overstretch the connecting strap during operation, as this may cause inaccurate readings or skin irritation.

6. Carefully read the manual before using the device.

7. The oximeter does not provide an alarm signal when SpO2 falls and is not suitable for continuous monitoring.

8. For prolonged use, change the finger used for measurement at least every 4 hours and check skin condition and correct sensor placement.

9. To avoid measurement errors, do not subject the device to autoclave processing, ethanol sterilization, or immersion in liquid.

10. High levels of dysfunctional hemoglobins (e.g., carboxyhemoglobin or methemoglobin) may affect accuracy.

11. Intravascular dyes such as indocyanine green or methylene blue may also cause inaccurate readings.

12. SpO2 readings may be inaccurate under bright light. Do not expose the device to direct sunlight.

13. Improper use of the device may result in inaccurate readings.

14. Medical devices emitting high-frequency signals (e.g., defibrillators) may cause interference.

15. Readings may be inaccurate if the sensor and a blood pressure cuff are applied to the same artery or intravenous line.

16. Hypotension, severe vasoconstriction, severe anemia, or hypothermia may also lead to inaccurate readings.

17. Readings may be inaccurate after resuscitation or in patients with tremors.

18. Dark or bright nail polish or gel polish may cause inaccurate SpO2 readings. In such cases, place the sensor on the earlobe after removing any earrings.

19. Do not look into the probe while the device is operating, as the infrared light is harmful to the eyes.

Follow standard guidelines for disposal of this type of device, including its batteries.

General Description of the Pulse Oximeter

Oxygen saturation (SaO2) is the percentage ratio between the concentration of oxyhemoglobin (HbO2 – fully oxygenated hemoglobin) and the total hemoglobin content in the blood (Hb + HbO2). In other words, it is the oxygen content of hemoglobin in the blood. This is a very important physiological parameter for the respiratory and circulatory systems. Many respiratory diseases reduce blood oxygen saturation. Additionally, factors such as impaired autonomic regulation due to anesthesia, trauma after major surgery, and other medical interventions can also reduce oxygen saturation. This may cause symptoms such as headaches, vomiting, and fatigue. Therefore, oxygen saturation is a crucial medical indicator.

The advantages of the fingertip pulse oximeter are its compact size, low power consumption, ease of use, and portability. The patient only needs to insert a finger into the photoelectric sensor, and the device immediately displays hemoglobin oxygen saturation. The accuracy of this method has been clinically proven.

Principle of Operation

The method is based on the Lambert–Beer law for the absorption spectra of reduced hemoglobin (RHb, deoxygenated hemoglobin) and oxyhemoglobin (O2Hb) in the visible and near-infrared ranges. The device combines photoelectric hemoglobin monitoring, pulse frequency scanning, and digital recording. Two light beams with wavelengths of 660 nm (visible) and 940 nm (near-infrared) pass through the finger (inserted nail-side up). A photosensitive element registers the transmitted signal, and the microprocessor processes and analyzes it. The results are displayed as two values: heart rate and blood oxygen saturation.

The fingertip pulse oximeter is compact, energy-efficient, easy to use, and portable. The patient simply places a finger into the photoelectric sensor, and the device immediately shows hemoglobin oxygen saturation. The accuracy of this method has been clinically confirmed.

Scope of Application of the Pulse Oximeter

The fingertip pulse oximeter is used to measure heart rate and blood oxygen saturation (SpO2) through the finger. It can be applied at home, in hospitals (by therapists, surgeons, anesthesiologists, pediatricians, intensivists, and other specialists), in social-medical organizations, and for assessing physical condition during sports activities. Use the device before or after exercise. Use during training is not recommended. It is also used by climbers, patients recovering at home, people who may require first aid, the elderly, people working more than 12 hours a day, athletes, and those working in confined spaces, etc. The device is not suitable for continuous patient monitoring.

Usage Tips

• Recommended body weight of the subject: 15–110 kg.

• Wait before testing if there is a sudden change in surrounding temperature (e.g., after entering a warm room from the cold). Finger temperature also affects results. Warm your hands before measurement – readings from cold fingers will be inaccurate.

• Handle the device with care, store away from dust, harmful substances, and direct sunlight. High humidity may damage or break the device.

• Check the oximeter weekly for damage. If broken or wet, discontinue use.

• Do not attempt self-repair.

• Disinfect the oximeter only as specified in the manual. For cleaning the case, use a cotton pad or alcohol wipe with medical alcohol.

• If not using the device for a month or more, remove the batteries.

• Avoid direct light sources (lamps, infrared heaters, sunlight) during testing.

#3. What Are Normal Pulse Oximeter Readingsx

• 100% saturation is unrealistic, since even in healthy individuals not all hemoglobin molecules bind 4 oxygen molecules.

• Normal range for men and women: 95–99%.
• Normal range for elderly people: 94–98%.
• Normal range for newborns and small children: 93–96%.
• For smokers and patients with chronic respiratory conditions: 92–95%.
• With COVID-19, hospitalization is required if saturation drops below 93%.
• Saturation below 90% requires immediate medical attention. Causes may include conditions other than COVID-19, including other serious diseases.

Technical Specifications

1. Display type: LCD or OLED
2. SpO2 measurement range: 70%–99%
Accuracy: ±2% for 70%–99%; SpO2 x 70% not measured
Resolution: ±1%
3. HR measurement range: 30–240 bpm
Accuracy: ±1 bpm or ±1% (for higher HR values)
4. Power supply: two 1.5V AAA alkaline batteries
5. Power consumption: <30 mA
6. Auto power-off: device switches off if no finger is detected
7. Dimensions: 62 x 32 x 33 mm
8. Operating conditions: Operating temperature: 5 °C–40 °C
Storage temperature: –10 °C–40 °C
Humidity: 15%–80% operating; 10%–80% storage
Atmospheric pressure: 70–106 kPa
9. Compliance: EMC standard IEC60601-1-2

Package Contents

• Pulse oximeter
• Lanyard
• English user manual

Possible Problems and Solutions