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5.3 PerfecTemp™ Sensor System
Speed and ease of access are two key advantages of ear
thermometry. Concerns regarding accuracy and reliability
have hindered adoption of this technology. In clinical studies,
the precision of ear temperature measurement has been shown
to be influenced by ear canal anatomy and variability in user
technique. Proper probe placement can also be a challenge,
particularly with young patients that move around during
measurement. Shallow probe placement, coupled with anatomical
variabilities such as ear canals with a small circumference and poor
visibility of the tympanic membrane, can result in readings that are
low compared to core temperature because the thermometer could
be focused on the cooler outer ear canal.
The Braun Thermoscan
®
PRO 6000 Ear thermometer incorporates a new proprietary sensor
system, PerfecTemp™, that overcomes the challenges presented by ear canal anatomy and
variations in technique among clinicians. The thermometer collects information about the
direction and depth of ear probe placement as it is placed into the ear canal and automatically
incorporates this information into the temperature calculation. Incorporating information
related to patient specific anatomy and exact ear probe placement in the ear canal increases
the accuracy of the measurement as compared to core temperature, especially when probe
positioning is not ideal.
5.4 ExacTemp™ technology
The Braun Thermoscan
®
PRO 6000 Ear thermometer also features ExacTemp™ technology
which supports temperature measurement reliability by detecting the stability of the probe
placement during the measurement. The ExacTemp light flashes during the measuring
process and remains illuminated when the measurement is complete, indicating consistent
placement of the probe during the measurement process. Consistent probe placement helps
support accurate temperature measurement.
5.5 Why measure in the ear?
Clinical studies have shown that the ear is an excellent site for
temperature measurement because temperatures taken in the ear
reflect the body’s core temperature
1
. Body temperature is regulated
by the hypothalamus
2
, which shares the same blood supply as
the tympanic membrane
3
. Changes in core body temperature are
usually seen sooner at the tympanic membrane than at other sites,
such as the rectum, mouth or under the arm. Advantages of taking
temperatures at the ear versus traditional sites:
Axillary temperature measurements reflect skin temperature
which may not reliably indicate the internal body temperature.
Rectal temperatures often lag significantly behind internal body temperature changes,
especially at times of rapidly changing temperatures. Also, there is a risk of cross
contamination.
Oral temperatures are often influenced by eating, drinking, thermometer placement,
breathing through the mouth, or the inability of the person to close their mouth completely.
1. Guyton A C, Textbook of medical physiology, W.B. Saunders, Philadelphia, 1996, p 919
2. Guyton A C, Textbook of medical physiology, W.B. Saunders, Philadelphia, 1996, p 754–5
3. Netter H F, Atlas of Human Anatomy, Novartis Medical Education, East Hanover, NJ, 1997, pp 63, 95.
Table 1: Ear canal
temperature gradient
7


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