JP5213527B2 - Pressure socks - Google Patents

Description

  The present invention relates to a pressure sock for preventing or alleviating swelling of the lower leg.

  Continuing to stand or sit for a long time may cause swelling in the lower leg such as calves, and may cause a feeling of dullness and fatigue. This is said to be due to the accumulation of waste products in the lower leg with the retention of blood and lymph over a long period of time.

Various proposals have been made to deal with this. The portable massage device described in Patent Document 1 is intended to improve blood circulation by providing electrodes on belts, socks, etc. wound around the ankle and calf and applying a low frequency or medium frequency to perform a massage action. It is. The sock described in Patent Document 2 is made by knitting a covering yarn with low elastic elasticity to the back thread of the mouth, and knitting natural rubber yarn in addition to the covering yarn on the leg part (lower leg), and fits the mouth and the leg part. The feeling of wearing is improved by applying pressure to the skin. Furthermore, the pressure is reduced from the ankle portion, which is the direction of the venous flow, toward the mouth side and the toe side to improve blood circulation and swell. The lower limb covering material described in Patent Document 3 forms a partial pressure-applying portion along the direction of lymph fluid flow by a stretchable fabric, and promotes the flow of lymph fluid and blood by stimulation and massage action by the pressing action. It is intended to eliminate swelling and fatigue, and a configuration in which the tightening pressure decreases from bottom to top is desirable.
JP 2006-296927 A JP 10-310903 A JP 2006-211985 A

  However, the massage device of Patent Document 1 can only obtain a local action of the electrode installation location, and is accompanied by application of a low frequency or the like, so that the use time is limited and it is difficult to obtain a sufficient effect.

  The socks of Patent Document 2 and the lower limb covering material of Patent Document 3 employ a setting in which tightening pressure is applied to the lower leg and the pressure is lowered from the lower side (ankle portion) to the upper side. Such setting of the tightening pressure is effective for eliminating or alleviating the retention of blood and lymph, and exhibits a certain swelling prevention effect. However, in order to obtain this effect, the clamping pressure is set to a pressure of, for example, 43.6 hPa at the lower part of the retracted portion (Patent Document 2).

  However, people with coldness are cold because the blood circulation of the lower limbs is insufficient, and if you wear socks that apply the tightening pressure as described above, blood circulation will be disturbed and swelling will occur. The prevention effect may not be obtained or you may feel dull.

  Accordingly, an object of the present invention is to provide a compression sock that is effective for preventing or alleviating swelling of the lower leg for a person who tends to cool.

  The inventors of the present invention have intensively studied to solve the above problems, and in the case of a person who has a tendency to cool, the pressure is made lower than the conventional set value while applying the tightening pressure by socks, and It has been found that a high swelling prevention effect can be obtained by keeping the portion covering the back part warm. The present invention has been completed based on such findings.

That is, the present invention provides the following compression socks:
When attached to a model wearing a nude body / pants-type MP20, extending from the foot to at least the lower leg and the fiber part expanding and contracting so that the tightening pressure of the lower leg is the highest at the ankle and lowers as it goes upward The degree of expansion and contraction is determined so that the tightening pressure at the ankle of
A pressure sock characterized by having a heat retention rate Rt of 26% or more of a portion covering a sole portion determined by the following measurement method.

Measurement method: In a 20 ° C. and 65% RH environment, a 10 cm × 10 cm type heat source base of a Thermolab II type tester manufactured by Kato Tech Co., Ltd., a heating base corresponding to a hot plate located above the heat source base, and the upper part of the heating base The amount of heat Hs supplied to the heating table in order to keep the temperature just below the table plate at 30 ° C. From the amount of heat Ho supplied to the heating table in order to keep the temperature immediately below the plate at 30 ° C. with nothing placed on the plate, the value Rt obtained by the following equation is used as the heat retention rate:
Rt = (Ho−Hs) / Ho × 100
In the present invention, the ankle portion refers to a portion immediately above a heel (ankle) in the lower leg.

  To configure a heating table equivalent to the 10cm x 10cm type heat source of the Thermolab II type tester manufactured by Kato Tech Co., Ltd., for example, at least a part of the upper wall of the box is composed of a base plate for sample mounting. In addition, a heater for heating the base plate is provided in the box body, and the wall portion is insulated so that the heat of the heater does not come out of the box body from the wall portion other than the base plate, and the wall portion is surrounded. It is possible to employ a structure in which an auxiliary wall is provided and heat is shielded by either or both of equalizing the temperature between both walls to the box body temperature.

  Hereinafter, the present invention will be described in more detail based on embodiments with reference to the drawings. FIG. 1 is a side view showing a pressure sock according to an embodiment of the present invention.

  This pressure sock has a dimension that extends from the foot portion to below the knee of the lower leg when worn. This pressure sock is made of a stretchable material, and the tightening pressure is applied when worn by making the circumference of each part smaller than the circumference of a normal human foot and lower leg. The tightening pressure acting on the lower leg is set to be highest at the ankle and lower as it goes upward.

The tightening pressure at the ankles is determined by the degree of elasticity of the pressure socks so that the tightening pressure at the ankles is 23 to 38 hPa when worn on a wearing model equivalent to nude body / pants MP20 (Nanasai Co., Ltd.). It is done. In addition, the heat retention rate Rt of the portion covering the sole portion determined by the following heat retention rate measurement method is set to 26% or more:
Method of measuring heat retention rate In a 20 ° C. and 65% RH environment, a 10 cm × 10 cm type heat source table of a Thermolab II type tester manufactured by Kato Tech Co., Ltd., a heating table corresponding to a hot plate located above the heat source table, and the heating table Using a base plate located at the top, a test piece is placed on the base plate so as to cover the entire top surface of the base plate, and the amount of heat Hs supplied to the heating base in order to keep the temperature directly below the base plate at 30 ° C. From the amount of heat Ho supplied to the heating table in order to keep the temperature immediately below the base plate at 30 ° C. with nothing on the base plate,
Rt = (Ho−Hs) / Ho × 100
The value Rt obtained by the above is defined as the heat retention rate.

  In this way, the pressure socks can apply the tightening pressure while promoting the blood flow of the lower leg, which tends to be insufficient for people who tend to be cold, by setting the tightening pressure and ensuring the heat retention rate. This is effective in preventing or eliminating such swelling of the lower leg. If the tightening pressure is lower than the above lower limit value, the tightening action of the lower leg will be insufficient and the flow of blood, lymph, and waste will be insufficient. The flow of the object is blocked at the tightening site, and none of the effects of preventing or eliminating swelling is obtained.

  From this viewpoint, it is more desirable that the degree of expansion / contraction is determined so that the tightening pressure at the ankle portion is 24 to 37 hPa.

The main specifications of the wearing model (nude body / pants MP20) are as follows.
・ Body body: Semi-rigid foamed urethane molding, linen stretch, lower leg circumference Ankle part: 20.5cm,
Dimensions every 5 cm from the ankle to the lower knee: 21.5 cm, 26.0 cm, 31.3 cm, 35.0 cm, 34.4 cm, 32.8 cm
The above-mentioned wearing model is made of a relatively hard material and has a predetermined size. On the other hand, the human body is flexible, and the size of the lower leg varies from person to person. It is different from the pressure at the time. However, a desired tightening pressure can be given to many people and an effect can be exhibited by using the tightening pressure when mounted on the wearing model having a standard size as a reference.

  When the heat retention rate of the pressure socks is less than the above lower limit, the effect of promoting the blood flow of the lower leg cannot be sufficiently obtained. Even if the tightening pressure is applied in this state, the effect of preventing or eliminating swelling cannot be obtained.

  From this point of view, the heat retention rate Rt of the portion covering the sole portion determined by the measurement method is more preferably 27% or more, and further preferably 28% or more.

  In order to obtain the above-mentioned tightening pressure, the sock can be obtained by knitting socks with a highly elastic fiber and reducing the circumferential length with respect to the dimensions of the mounting location. In the illustrated example, the part 1 covering the lower leg 1 and the part 2 covering the upper part of the foot are made of 75 denier nylon, polyurethane and polypropylene fibers, and are flat knitted. In addition, the portion 1 covering the lower thigh enhances the massage effect by providing a knitting portion 11 at the portion along the flow of the lymph fluid to provide a stimulating effect.

  The degree of expansion and contraction is set so that the tightening pressure becomes lower as it goes upward from the ankle portion. In order to prevent blood and lymph from staying in the lower leg, it is most effective to apply a tightening pressure to the ankle part, and the setting of the tightening pressure is important. If the tightening pressure above the ankle portion of the lower leg is made lower than that of the ankle portion, retention prevention and flow promotion by the tightening pressure can be obtained without inhibiting the flow of blood or lymph. Accordingly, the tightening pressure above the ankle portion is set under a relatively gradual functional requirement, and can be determined in consideration of whether the wearing feeling is good or bad. For example, when the tightening pressure is set on the wearing model, the pressure immediately below the knee can be 34 to 92% of the pressure at the ankle, more preferably 40 to 80%. More preferably, it is 50 to 70%.

  In order to obtain the above heat retention rate in the portion 3 covering the sole and the heel part, a fiber material having high heat insulation is used, the diameter of the yarn to be knitted is increased, the knitting density is increased, and the heat retention is high. It is possible to adopt a configuration such as a method. In the example shown in the figure, heat retention is enhanced by using a multi-filament of 75 denier polypropylene and knitting tack.

  Examples of the stretchable fiber used for the production of the pressure socks include polyurethane-based fibers such as raw rubber and polyurethane. Moreover, it is good also as a covering fiber which covers polyurethane-type fiber, such as polyamide-type fibers, such as cotton, an acryl, and nylon, polyether * ester-type fiber, and polypropylene, using a polyurethane-type fiber as a core.

  The measuring method using the Thermolab II type testing machine for measuring the heat retention rate is as follows. The BTBox includes a box that supports a hot plate (upper surface size 10 × 10 cm) serving as a base plate on which a sample is placed from below, and a structure in which an electric heater is disposed in the box to heat the hot plate from below. It has become. The heat plate is surrounded by the heat insulation box so that it protrudes 1 mm from the upper surface of the box, and the side and the lower part of the box are heat insulating outer peripheral walls whose upper surface is lower than the upper surface of the box. being surrounded. The hot plate is made of A2017 (Duralumin). Thermolab type II testing machine is equipped with a control unit for controlling the temperature of the hot plate of B.T.Box.

  Adhere double-sided tape to the upper surface of the outer peripheral wall of B.T.Box. Prepare a sample that reaches the upper surface of the outer peripheral wall, place the sample so as to cover the upper surface of the hot plate (base plate), and take care to prevent wrinkles from forming on the sample. Paste and fix. In this state, the testing machine is operated, and the supply heat amount Hs is converted from the electric energy for maintaining the temperature just below the base plate in the box at 30 ° C. by controlling the temperature of the electric heater below the hot plate. Separately from this, the supply heat amount Ho is converted from the amount of electric power for maintaining the temperature immediately below the base plate in the box at 30 ° C. with nothing placed on the hot plate. Based on this, the value Rt is obtained by the above-described equation.

[1. Examination showing differences between general and cold people]
The effect of conventional swelling prevention socks on general and cold people was tested.
1-1. Test subjects and test socks We selected six people with coldness on the lower leg and six other general people as subjects. Using a conventional sock for preventing swelling based on a tightening action, the effect of preventing or mitigating swelling was investigated by putting it on a cold person and others.

  The specifications of the socks are as follows.

Material: Mainly made of nylon and polyurethane Dimensions Total length: Placement size 25.8cm, Elongation size 49.1cm
Ankle width: Placement size 7.5cm, Elongation size 14.7cm
Calf width: Placement dimension 7.8cm, Elongation dimension 21.9cm
Here, the placement dimension is a dimension when the sock is placed on a flat surface, and the elongation dimension is a dimension when a tensile force is applied by the following elongation measurement method. The width of the calf portion was measured at a point closer to the foot of 8.5 cm from the sock's mouth (the same applies to the following examples and comparative examples).

  Elongation measuring method: Both ends of the place where the placement dimension in the sock is measured are sandwiched by a 9 mm wide pinching tool, pulled in one direction with a force of 4 kg, and the dimension at that time is measured to obtain an elongation dimension. As the measuring device, an elongation dimension measuring machine manufactured by Otake Works was used.

In this sock, the part covering the sole is the same as the other part, and is not heat-insulating.
1-2. Test with bare feet First, without putting on socks, place the subject in a chair and take a posture where the thighs and lower legs are 90 degrees on the back of the knee. The perimeter of calf is measured (perimeter L1a). Next, the circumference of the same part was measured in the same posture 6 hours after keeping the sitting posture without wearing socks (circumference L1b). And circumference difference dL1 was calculated | required by circumference length L1a-circumference length L1b.
1-3. Test by wearing socks First, without wearing socks, the circumference of the part (calf) 10 cm below the center of the depression on the back of the knee is measured in the same manner as described above (perimeter L2a). Next, the test subjects were put on test socks, and the circumference of the same part was measured in the same posture 6 hours after keeping the sitting posture (perimeter L2b). And the circumference difference dL2 was calculated | required by circumference length L2a-circumference length L2b.
1-4. Results Table 1 shows the measurement results. Table 1 shows the average of 6 people for each specification.

表１によると、実験開始の６時間経過後に、一般の被験者では、素足の場合に周長が７ｍｍ増加し、むくみが発生乃至増大したが、むくみ防止用靴下を履いた場合は、周長の変化がなく、むくみが解消乃至緩和したことを示している。これに対し、冷え性の被験者では、素足の場合に周長が７ｍｍ増加し、むくみが発生乃至増大し、むくみ防止用靴下を履いた場合でも周長が３ｍｍと増加し、むくみ防止効果が得られていない。

According to Table 1, after 6 hours from the start of the experiment, in general subjects, the circumference increased by 7 mm in the case of bare feet, and swelling occurred or increased, but when wearing socks for swelling prevention, There was no change, indicating that swelling was eliminated or alleviated. On the other hand, in a cold test subject, the circumference increases by 7 mm in the case of bare feet, swelling occurs or increases, and the circumference increases to 3 mm even when wearing socks for preventing swelling, and the swelling prevention effect is obtained. Not.

That is, it is clear that general swelling prevention socks have no effect on people who are cold.
[2. Comparative test by example and comparative example]
The effect of the pressure socks according to the present invention on a cold person was tested.
2-1. Creation of Examples and Comparative Examples Samples with various tightening pressures and heat retention rates were created for the socks having the basic shape shown in FIG. 1 according to the specifications in Tables 2 and 3 below. The tightening pressure and the heat retention rate were respectively determined by measurement using the aforementioned nude body / pants type MP20 as a wearing model and measurement using a Thermolab II type tester manufactured by Kato Tech Co., Ltd. Tightening pressure was measured using a contact pressure measuring instrument (AMI3037-2) manufactured by AIM Techno, and a measuring air pad (diameter) on the back of the measurement point on the lower leg of the wearing model with socks. 2 cm).

2-2. むくみ度の測定
被験者として下腿に冷え性をもつ人達を選んだ。先ず靴下を履かない状態で、被験者を椅子に坐らせ膝裏で大腿と下腿とが９０度となる姿勢とし、膝裏の窪み中央部から１０ｃｍ下方の部位（ふくらはぎ）の周長を測定する（周長Ｌａ）。次に、被験者にサンプルの靴下を履かせ、着座姿勢を保った６時間後に同じ姿勢で同じ部位の周長を測定した（周長Ｌｂ）。そして、周長Ｌａ−周長Ｌｂにより周長差ｄＬを求めた。被験者は、各仕様について６名とした。
2-3. 結果
上記の測定結果を表４に示す。表４は各仕様について６名の平均値を示している。

2-2. Measurement of swelling The subjects who had coldness in the lower leg were selected as subjects. First, without putting on socks, the subject sits on a chair and takes a posture in which the thigh and the lower leg are 90 degrees on the back of the knee, and the circumference of the part (calf) 10 cm below the center of the depression on the back of the knee is measured. (Peripheral length La). Next, the test subject was put on sample socks, and the circumference of the same part was measured in the same posture 6 hours after keeping the sitting posture (circumference Lb). And the circumference difference dL was calculated | required by circumference length La-circumference length Lb. There were 6 subjects for each specification.
2-3. Results Table 4 shows the measurement results. Table 4 shows the average of 6 people for each specification.

表４によると、実験開始の６時間経過後に、実施例１では周長が０．３ｍｍ減少しむくみが発生していないことを示し、実施例２では周長が６．８ｍｍ減少しむくみが解消乃至緩和したことを示している。これに対し、比較例１，４は、保温率が実施例と同じように高くても、締め付け圧が低い比較例１では周長が４．５ｍｍ増加し、締め付け圧が高い比較例４では周長が３．５ｍｍ増加し、各々むくみが発生乃至増大したことを示している。また、比較例２，３では、締め付け圧が各々実施例１，２と同じであっても、保温率が低いため比較例２では５．２ｍｍ、比較例３では２．７ｍｍ増加し、各々むくみが発生乃至増大したことを示している。

According to Table 4, after 6 hours from the start of the experiment, in Example 1, the circumference decreased by 0.3 mm and no swelling occurred, and in Example 2, the circumference decreased by 6.8 mm and the swelling was eliminated. It shows that it was relaxed. On the other hand, in Comparative Examples 1 and 4, even if the heat retention rate is as high as in the Example, the peripheral length is increased by 4.5 mm in Comparative Example 1 where the clamping pressure is low and the circumference is increased in Comparative Example 4 where the clamping pressure is high. The length increased by 3.5 mm, indicating that swelling occurred or increased. In Comparative Examples 2 and 3, even if the tightening pressures are the same as those in Examples 1 and 2, respectively, the heat retention rate is low. It is shown that the occurrence or increase occurred.

  Thus, it is apparent that swelling can be prevented or alleviated when the tightening pressure and the heat retention rate are within the predetermined ranges specified in the present invention.

1 is a side view showing an embodiment of a pressure sock according to an embodiment of the present invention.

Explanation of symbols

1 part covering the lower leg 3 part covering the sole

Claims (1)

When extending from the foot to at least the lower leg, the fiber is stretched so that the tightening pressure of the lower leg is the highest in the ankle and lowers as it goes upward, and when worn on a wearing model equivalent to the nude body / pants MP20 The degree of expansion and contraction is determined so that the tightening pressure at the ankle is 23 to 38 hPa,
A pressure sock characterized by having a heat retention rate Rt of 26% or more of a portion covering a sole portion determined by the following measurement method.
Measurement method: In a 20 ° C. and 65% RH environment, a 10 cm × 10 cm type heat source base of a Thermolab II type tester manufactured by Kato Tech Co., Ltd., a heating base corresponding to a hot plate located above the heat source base, and the upper part of the heating base The amount of heat Hs supplied to the heating table in order to keep the temperature just below the table plate at 30 ° C. From the amount of heat Ho supplied to the heating table in order to keep the temperature immediately below the plate at 30 ° C. with nothing placed on the plate, the value Rt obtained by the following equation is used as the heat retention rate:
Rt = (Ho−Hs) / Ho × 100

Images