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01:20Mechanisms of Heat Transfer II
In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
01:19Mechanism of heat transfer
Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
01:14Mechanisms of Heat Transfer I
Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
01:14Mechanisms of Heat Transfer
Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant heat.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant heat.
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Cortical heat generation using an irrigating/aspirating single-pass reaming vs conventional stepwise reaming.
Thomas F Higgins1, Virginia Casey, Kent Bachus
1University of Utah Department of Orthopaedics, Salt Lake City, Utah 84108, USA. thomas.higgins@hsc.utah.edu
Journal of Orthopaedic Trauma
|May 3, 2007
Summary
The irrigating aspirator (RIA) reaming system significantly reduced bone temperature compared to standard reaming. However, the RIA system generated higher pressures, indicating a need for further development and in vivo evaluation.
Area of Science:
- Orthopedic surgery
- Biomedical engineering
- Surgical innovation
Background:
- Intramedullary reaming is a critical step in orthopedic surgery for preparing bone canals.
- Elevated temperatures during reaming can lead to thermal necrosis of bone tissue.
- Intramedullary pressure generation during reaming can potentially cause complications like fat embolism syndrome.
Purpose of the Study:
- To compare the heat and pressure generation of a novel irrigating aspirator (RIA) intramedullary reaming system against traditional stepwise reaming.
- To evaluate the efficacy of the RIA system in managing thermal insult to cortical bone.
Main Methods:
- An in vitro study utilizing 8 pairs of human cadaver tibias.
- Thermocouples and pressure transducers were employed to measure temperature and pressure within the intramedullary canal.
- Specimens underwent either single-pass RIA reaming or standard stepwise reaming.
Main Results:
- The RIA system demonstrated significantly lower maximum temperatures in the distal diaphysis (42.0°C vs. 58.7°C).
- The RIA system generated significantly higher maximum pressures in the distal tibia (32.7 kPa vs. 17.0 kPa).
- No significant difference was observed in the pressure applied to the load cells during reaming.
Conclusions:
- The prototype RIA system effectively reduces bone temperature during intramedullary reaming.
- Continuous irrigation in the RIA system appears to mitigate thermal damage to cortical bone.
- Further development of the RIA system's aspirator function is warranted, alongside in vivo testing, due to observed higher intramedullary pressures.