Ear thermometer

Ear Thermometer

An ear thermometer, also known as a tympanic thermometer, is a device used to measure the body temperature by detecting the infrared heat emitted from the eardrum. The eardrum shares blood supply with the hypothalamus, the part of the brain that regulates the body's core temperature. Therefore, changes in body temperature are often detected sooner in the eardrum than in other places.

History

The ear thermometer was invented by Dr. Theodor H. Benzinger in 1964. Prior to this, temperature measurements were typically taken from the mouth, rectum, or under the arm using a mercury thermometer. The ear thermometer provided a quicker and less invasive way to measure body temperature.

Design and Function

The ear thermometer consists of an infrared sensor, a display screen, and a probe that is inserted into the ear canal. The infrared sensor detects the heat emitted from the eardrum and surrounding tissue, and this information is converted into a temperature reading on the display screen.

To use an ear thermometer, the probe is gently inserted into the ear canal and a button is pressed to take a reading. The temperature is typically displayed within a few seconds. Some models also feature a pre-warmed tip to ensure accuracy and comfort.

Accuracy and Use

Ear thermometers are commonly used in both clinical and home settings due to their speed and ease of use. However, their accuracy can be affected by factors such as earwax buildup, the angle at which the thermometer is inserted, and the presence of an ear infection.

For accurate readings, it is recommended to pull the ear back and up for adults, or back and down for children, to straighten the ear canal. The thermometer should be inserted until a secure seal is formed, and the same ear should be used for repeated measurements.

Types of Ear Thermometers

There are several types of ear thermometers available, including digital ear thermometers and infrared ear thermometers. Digital ear thermometers use electronic heat sensors to record body temperature, while infrared ear thermometers use an infrared scanner to measure the temperature of the eardrum.

See Also

• Thermometer
• Fever
• Body temperature
• Infrared thermometer

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