WordNet

a substance used as a warm moist medicinal compress or poultice
deliberate and intentional triggering (of trouble or discord) (同)instigation
application of warm wet coverings to a part of the body to relieve pain and inflammation

PrepTutorEJDIC

(不和・反乱などの)扇動,誘発

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2012/09/01 00:38:07」(JST)

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"HotBag" redirects here. For the container used to keep pizzas warm, see Pizza delivery#Delivery bags.

A heating pad is a pad used for warming of parts of the body in order to manage pain. Localized application of heat causes the blood vessels in that area to dilate, enhancing perfusion to the targeted tissue. Types of heating pads include electrical, chemical and hot water bottles.

Types

An electric heating pad

Electrical

Electric pads usually operate from household current and must have protection against overheating.

A moist heating pad is used dry on the user's skin. These pads register temperatures from 170 to 180 degrees Fahrenheit (76 to 82 degrees Celsius) and are intended for deep tissue treatment and can be dangerous if left on unattended. Moist heating pads are used mainly by physical therapists but can be found for home use. A moist cloth can be added with a stupe cover to add more moisture to the treatment.

Chemical

A sodium acetate heat pad

Disposable chemical pads employ a one-time exothermic chemical reaction such as catalyzed rusting of iron, or dissolving calcium chloride. The reagents are kept in separate compartments within the pad. When the user squeezes the pad, they break and the reagents mix, producing heat.

The most common reusable heat pads contain a supersaturated solution of sodium acetate (NaCH₃COO) in water. Crystallization is triggered by flexing a small flat disc of notched ferrous metal embedded in the liquid. Pressing the disc releases very tiny adhered crystals of sodium acetate^[1] into the solution which then act as nucleation sites for the crystallization of the sodium acetate into the hydrated salt (sodium acetate trihydrate). Because the liquid is supersaturated, this makes the solution crystallize suddenly, thereby releasing the energy of the crystal lattice. The use of the metal disc was invented in 1978.^[2]

The pad can be reused by placing it in boiling water for 10–15 minutes, which redissolves the sodium acetate trihydrate in the contained water and recreates a supersaturated solution. Once the pad has returned to room temperature it can be triggered again. Triggering the pad before it has reached room temperature results in the pad reaching a lower peak temperature, as compared to waiting until it had completely cooled.^{[citation needed]}

High specific-heat capacity materials

Heating packs can also be made by filling a container with a material that has a high specific heat capacity, which then gradually releases the heat over time. A hot water bottle is the most familiar example of this type of heating pad.

A microwavable heating pad is a heating pad that is warmed by placing it in a microwave oven before use. Microwavable heating pads are typically made out of a thick insulative fabric such as flannel and filled with grains such as wheat, buckwheat or flax seed. Due to their relative simplicity to make, they are frequently sewn by hand, often with a custom shape to fit the intended area of use. In rare instances, these types of pads have been known to ignite during or after the microwave process and cause fires.^{[citation needed]}

Often, aromatic compounds will also be added to the filler mixture to create a pleasant or soothing smell when heated. The source of these can vary significantly, ranging from adding essential oils to ground up spices such as cloves and nutmeg, or even dried rose petals.

Phase change materials

Main article: Phase Change Material

Phase change materials can be used for heating pads intended to operate at a fixed temperature. The heat of fusion is used to release the thermal energy.

Function

Many episodes of pain come from muscle exertion or strain, which creates tension in the muscles and soft tissues. This tension can constrict circulation, sending pain signals to the brain. Heat application eases pain by:

dilating the blood vessels surrounding the painful area. Increased blood flow provides additional oxygen and nutrients to help heal the damaged muscle tissue.

stimulating sensation in the skin and therefore decreasing the pain signals being transmitted to the brain

increasing the flexibility (and decreasing painful stiffness) of soft tissues surrounding the injured area, including muscles and connective tissue.

As many heating pads are portable, heat may be applied as needed at home, at work, or while traveling. Some physicians recommend alternating heat and ice for pain relief. As with any pain treatment, a physician should be consulted prior to beginning treatment.

References

^ Solidification in heat packs: III. Metallic trigger. Article on sodium acetate
^ Reusable heat pack containing supercooled solution and means for activating same. US Patent 4,077,390 (1978)

English Journal

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Nandini B1, Mooventhan A2, Manjunath NK3.
Explore (New York, N.Y.).Explore (NY).2018 Jun 28. pii: S1550-8307(17)30363-4. doi: 10.1016/j.explore.2018.01.002. [Epub ahead of print]
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Massage therapy for home care patients using the health insurance system in Japan.

Kondo H1, Ogawa S2, Nishimura H2, Ono A2.
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[Role of Pharmacists in Completion of Adjuvant Cisplatin-Vinorelbine Chemotherapy in Japanese Patients with Non-small Cell Lung Cancer].

Morimoto Y1, Takei H2, Tachibana K2, Nakazato Y2, Tanaka R2, Nagashima Y2, Watanabe K1, Seki R3, Shinohara T3, Kondo H2.
Yakugaku zasshi : Journal of the Pharmaceutical Society of Japan.Yakugaku Zasshi.2018;138(3):437-442. doi: 10.1248/yakushi.17-00192.
PMID 29503435

Atypical penile Mondor's disease - involvement of the circumflex vein.

Arora R1, Sonthalia S2, Gera T3, Sarkar R4.
International journal of STD & AIDS.Int J STD AIDS.2015 Apr;26(5):360-3. doi: 10.1177/0956462414537482. Epub 2014 May 27.
PMID 24867818

Japanese Journal

ゲムシタビンによる血管痛の関連要因の検討

Palliative Care Research 13(2), 187-193, 2018
NAID 130006733867

Role of Pharmacists in Completion of Adjuvant Cisplatin-Vinorelbine Chemotherapy in Japanese Patients with Non-small Cell Lung Cancer

薬学雑誌. 乙号 138(3), 437-442, 2018
NAID 130006410758

施設入所高齢者に対する湯たんぽによる睡眠への影響 (日本健康医学会雑誌25周年記念号)

日本健康医学会雑誌 = Journal of Japan Health Medicine Association 25(増刊), 296-303, 2016-12
NAID 40021038905

膝関節の痛み・こわばりに対するホットパックを用いた温罨法の効果 : 下肢の温度と疼痛・こわばりの変化

日本赤十字看護学会誌 = Journal of the Japanese Red Cross Society of Nursing Science 16(1), 1-8, 2016-03
NAID 40021010798

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