Insoles, and shoes equipped with the insoles.

Abstract

This invention provides a novel insole that effectively stimulates the abductor hallucis muscle to increase its contractile force, thereby preventing or improving hallux valgus. [Solution] The present invention provides an insole 100 to be placed inside a shoe 30, comprising a main body 1 that supports the wearer's foot 20 from the toes to the heel, and a wing portion 2 provided on the heel-side peripheral edge of the main body 1, which rises along the inner wall of the shoe when the insole 100 is placed inside the shoe, and the wing portion 2 is provided with a projection 3 that presses against the abductor hallucis muscle 21 of the wearer's foot 20 at the thickened portion 21a of the abductor hallucis muscle 21.

Description

[Technical Field]

[0001] The present invention relates to an insole effective in preventing or improving bunions, and to a shoe equipped with the insole. [Background technology]

[0002] Hallux valgus is a foot problem in which the first metatarsal bone (the metatarsal bone of the first toe) turns inward and the first proximal phalanx (the proximal phalanx of the first toe) turns outward, causing the joint connecting the first metatarsal bone and the first proximal phalanx (the first metatarsophalangeal joint) to protrude inward. Hallux valgus can cause pain and numbness, making walking difficult.

[0003] Traditionally, bunions have been recognized as a foot problem in women caused by strong pressure on the toes from wearing shoes with narrow toe shapes, such as pointed-toe shoes, or shoes that don't fit properly.

[0004] However, in recent years, bunions have become a problem among the elderly, both men and women. In the elderly, bunions are mainly caused by the weakening of the muscles in the soles of the feet due to aging. When muscles weaken, their contractile force decreases, and the muscles remain relaxed. If the abductor hallucis muscle remains relaxed, it cannot pull the first proximal phalanx toward the medial side of the foot, causing the first proximal phalanx to tilt toward the side of the foot, resulting in a bunion.

[0005] Furthermore, bunions can develop at a young age due to the loosening of the ligamentous connections between bones. In this case, the bunion, a foot deformity, occurs first, making it difficult for the abductor hallucis muscle to function. As a result, the abductor hallucis muscle weakens, and its contractile force decreases further, causing the ligamentous connections between bones to remain loose.

[0006] Patent Document 1 discloses footwear that has an inclined surface that slopes from the medial side to the lateral side of the foot, and is designed so that the inclined surface contacts the sole of the foot corresponding to the muscle belly of the abductor hallucis muscle. When the wearer walks in the footwear, the sole of the foot is pressed against the inclined surface by the wearer's own weight, and the sole of the foot is pushed back by the inclined surface as a reaction. At this time, the abductor hallucis muscle is pressed against the navicular bone of the foot by the inclined surface, so the attachment point to the first proximal phalanx is pulled towards the calcaneus. This is said to create a force that forcibly rotates the first proximal phalanx toward the medial side, thereby correcting the bunion. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2008-200392 [Overview of the project] [Problems that the invention aims to solve]

[0008] However, the footwear disclosed in Patent Document 1 has a structure that causes an inclined surface to contact the arch of the wearer's foot from below, so even when the wearer walks while wearing the footwear, it only slightly presses on the abductor hallucis muscle. Furthermore, the thickest part of the abductor hallucis muscle in the middle is composed solely of muscle, but the muscle mass decreases towards both ends, and the tendons become more prominent. The part of the abductor hallucis muscle adjacent to the navicular bone is a part where muscle and tendon are mixed, and the muscle mass is small. Therefore, even if pressure is applied to this part, it is difficult to sufficiently elicit the contractile force of the abductor hallucis muscle. On the other hand, tendons do not have elasticity, and when a tendon is pressed, the tendon pulls the first proximal phalanx toward the medial side of the foot, forcing the first proximal phalanx to rotate toward the medial side, thus correcting hallux valgus. In other words, it is believed that the aforementioned footwear corrects bunions primarily by applying pressure to the tendons. However, continuous pressure on the tendons can easily cause the wearer of the footwear to experience severe pain. Therefore, it is extremely difficult to prevent or improve bunions by continuously applying pressure to the tendons.

[0009] Therefore, the object of the present invention is to provide a novel insole that effectively acts on the abductor hallucis muscle to increase its contractile force, thereby exhibiting a preventive or ameliorative effect on hallux valgus. Another object of the present invention is to provide a novel insole that suppresses the protrusion of the metatarsophalangeal joint of the first toe, which is bent into a "V" shape due to the development of hallux valgus, toward the medial side of the foot. Another object of the present invention is to provide a shoe equipped with the insole. [Means for solving the problem]

[0010] As a result of diligent research to solve the above problems, the inventors have found that by applying pressure to the medial side of the foot from the side, rather than applying pressure to the sole of the foot, and by selectively applying pressure to the thicker part of the abductor hallucis muscle with a small-area projection at the tip, rather than applying pressure to the part of the abductor hallucis muscle adjacent to the navicular bone with a broad surface, it is possible to apply strong pressure to the area where the muscle cells involved in the contraction of the abductor hallucis muscle are most densely located. This allows for a significant recovery of the contractile force of the abductor hallucis muscle even in elderly or other wearers with weakened muscles. Furthermore, by recovering the contractile force of the abductor hallucis muscle, the attachment point of the abductor hallucis muscle to the first proximal phalanx is pulled toward the calcaneus, allowing the first proximal phalanx to rotate toward the medial side of the foot, thereby correcting hallux valgus.

[0011] The inventors also noticed that in feet with hallux valgus, the first toe bends in a "V" shape, causing the metatarsophalangeal joint to protrude inward. At the same time, when not bearing weight, the metatarsal head of the first toe is often lower than that of the second to fifth toes and protrudes inward. Furthermore, they noticed that in cases where the metatarsal head of the first toe is lower than that of the second to fifth toes when not bearing weight, when standing weight is applied, a force is exerted that moves the lowered metatarsal head of the first toe upward. This causes the metatarsophalangeal joint of the first toe to protrude even further inward, often resulting in severe pain, and that calluses and corns are also more likely to become severe. Furthermore, we found that maintaining a lower position of the metatarsal head of the first toe compared to the metatarsal heads of the second to fifth toes, even when standing and bearing weight, suppresses the medial protrusion of the metatarsophalangeal joint of the first toe, thereby reducing pain.

[0012] The inventors have further discovered that when the metatarsal head of the first toe is lowered, lowering the distal phalanx of the first toe along with it prevents twisting of the metatarsophalangeal joint, thereby improving the pain-reducing effect on the metatarsophalangeal joint. They also found that lowering the distal phalanges of the second and subsequent toes (second, third, and fourth toes, or second, third, fourth, and fifth toes) in conjunction with lowering the distal phalanx of the first toe results in a better fit, and makes it easier to flex and extend the metatarsophalangeal joints, proximal interphalangeal joints, and distal interphalangeal joints of the second and subsequent toes. As the second and subsequent toes flex and extend, the first toe also becomes easier to flex and extend, thus promoting the recovery of the motor function of the first toe. This is because, although the muscles that flex the first toe and the muscles that flex the second and subsequent toes are different, it is often difficult to move each of them independently. When you try to flex or extend a specific toe, all the toes move simultaneously, creating a situation where the second and subsequent toes can move more easily, which in turn makes it easier for the first toe, which suffers from bunions and has reduced motor function, to move as well. This invention was completed based on these findings.

[0013] In other words, the present invention is an insole to be placed inside a shoe, The main body of the shoe supports the wearer's foot from the toes to the heel, It is provided at the heel-side peripheral portion on the inner-foot side of the main body portion, and when the insole is laid inside the shoe, it includes a wing portion that rises along the inner wall of the shoe. An insole is provided, in which the wing portion is provided with a protrusion that presses the abductor hallucis muscle of the foot of the wearer of the shoe at the thick part of the abductor hallucis muscle.

[0014] It is preferable that the 25% compression load of the protrusion is 0.01 - 0.1 MPa.

[0015] It is preferable that the top of the protrusion is flat or convexly curved.

[0016] When the wearer of the shoe places the foot on the main body portion, the main body portion includes a first portion that includes locations corresponding to the metatarsal head to the distal phalanx of the first toe of the foot and the distal phalanges of the second to fourth toes, and a second portion that is adjacent to the first portion and is on the heel side of the first portion. There is a step between the first portion and the second portion, and it is preferable that the first portion is lower than the second portion.

[0017] When the wearer of the shoe places the foot on the main body portion, the main body portion includes a first portion that includes locations corresponding to the metatarsal head to the distal phalanx of the first toe of the foot and the distal phalanges of the second to fourth toes, and a second portion that is adjacent to the first portion and is on the heel side of the first portion. The surface layer of the first portion is composed of a softer material than the surface layer of the second portion. When the wearer of the shoe places the foot on the main body portion, it is preferable that the first portion pressed by the foot sinks and becomes lower than the second portion.

[0018] The present invention also relates to an insole laid inside a shoe, comprising a main body portion that supports the foot of the wearer of the shoe from the toes to the heel. When the wearer of the shoe places the foot on the main body portion, the main body portion includes a first portion that includes locations corresponding to the metatarsal head to the distal phalanx of the first toe of the foot and the distal phalanges of the second to fourth toes, and a second portion that is adjacent to the first portion and is on the heel side of the first portion. The insole is provided with a step between the first and second parts, with the first part being lower than the second part.

[0019] The present invention also relates to an insole that is placed inside a shoe, The shoe features a main body that supports the wearer's foot from the toes to the heel. The main body includes a first portion that includes the area corresponding to the metatarsal head and distal phalanx of the first toe, and the distal phalanx of the second to fourth toes, when the wearer places their foot on the main body, and a second portion adjacent to the first portion, located on the heel side of the first portion. The surface layer of the first part is made of a softer material than the surface layer of the second part. The present invention provides an insole in which, when a person wearing a shoe places their foot on the main body, the first part pressed by the foot sinks down and becomes lower than the second part.

[0020] The present invention also provides shoes equipped with the insole. [Effects of the Invention]

[0021] The insole of the present invention has a projection on the wing portion that rises along the inner wall of the shoe, which presses against the abductor hallucis muscle of the foot at its thickest point. Therefore, when the insole is placed inside a shoe and the wearer puts the shoe on, the projection effectively presses against the abductor hallucis muscle of the wearer's foot. As a result, the contractile force of the abductor hallucis muscle is significantly restored, the attachment point of the abductor hallucis muscle to the first proximal phalanx is pulled towards the calcaneus, and the first proximal phalanx rotates toward the medial side of the foot. This corrects hallux valgus.

[0022] Furthermore, the insole of the present invention has a step in the main body, so that the part where the metatarsal head and distal phalanx of the first toe and the distal phalanx of the second to fourth toes make contact is lower than the rest of the insole. Alternatively, the part where the metatarsal head and distal phalanx of the first toe and the distal phalanx of the second to fourth toes make contact is made of a soft material, and when the foot is placed on it, the aforementioned part sinks in and becomes lower, forming a step. Therefore, when a wearer wears shoes with the insole of the present invention, the metatarsal head of the first toe can be accommodated in a space created by the step at the toe side of the shoe, lower than the metatarsal heads of the second to fifth toes. As a result, it is possible to prevent the metatarsophalangeal joint of the first toe from protruding inward and rubbing against the shoe. In addition, by accommodating the distal phalanx of the second and subsequent toes, along with the first toe, in a space lower than the rest of the insole, standing stability is enhanced. Furthermore, the difference in height makes it easier for the second and subsequent toes to bend and extend, and when the second and subsequent toes can bend and extend more easily, the first toe also becomes more mobile, which can promote the recovery of the motor function of the first toe.

[0023] Because the shoes of the present invention are equipped with the insole, they can increase the contractile force of the abductor hallucis muscle of the wearer's foot, and thus have the effect of preventing the wearer from developing bunions. Furthermore, if the wearer already has bunions, the shoes have the effect of suppressing the protrusion of the metatarsophalangeal joint of the first toe toward the medial side of the foot, thereby preventing pain caused by friction against the shoe due to the protrusion of the metatarsophalangeal joint. [Brief explanation of the drawing]

[0024] [Figure 1] This is a top view of the insole 100 according to Embodiment 1. [Figure 2] This is a cross-sectional view of the insole 100 (section AA in Figure 1). [Figure 3] This is a top view showing how the protrusions press against the abductor hallucis muscle of the wearer's foot at the thicker portion when the insole 100 is placed inside the shoe and the wearer puts their foot into it. [Figure 4]This is a perspective view showing the insole 100 placed inside a shoe, with a person wearing the shoe placing their foot inside. [Figure 5] The image shows a cross-sectional view of the shoe (BB cross-section in Figure 3) with the insole 100 laid inside the shoe and the wearer's foot placed inside, showing how the protrusions are pressing laterally against the abductor hallucis muscle of the wearer's foot at the thicker portion. [Figure 6] This diagram illustrates the positional relationship between the foot's skeletal structure and the abductor hallucis muscle, and how the abductor hallucis muscle pulls its attachment point to the first proximal phalanx toward the calcaneus, creating a force that rotates the first proximal phalanx toward the medial side of the foot. [Figure 7] This is a top view of insole 100', which is a modified version of insole 100. [Figure 8] This is a perspective view of the insole 101, which is a modified example of Embodiment 1. [Figure 9] This is a top view illustrating the positional relationship between the insole 101 and the bones of the foot when a person wearing the shoe places their foot on the insole 101. [Figure 10] This is a top view of the insole 101. [Figure 11] This is a perspective view of insole 101', which is a modified version of insole 101. [Figure 12] This is a perspective view of insole 101, which is a modified example of insole 101. [Figure 13] This is a disassembled perspective view of the insole 101. [Figure 14] This is a perspective view of an insole 102, which is a modified example of Embodiment 1. [Figure 15] This is a disassembled perspective view of the insole 102. [Figure 16] This is a perspective view of the insole 200 according to Embodiment 2. [Figure 17] This is a perspective view of the insole 300 according to Embodiment 3. [Modes for carrying out the invention]

[0025] [insole] Hereinafter, an insole according to an embodiment of the present invention will be described with reference to the drawings, using a left foot insole as an example. Normally, insoles are used in pairs, left and right, and although not shown in the illustrations, these pairs of insoles are formed symmetrically.

[0026] (Insole 100 according to Embodiment 1) As shown in Figure 1, the insole 100 according to Embodiment 1 comprises a main body portion 1 and a wing portion 2, and the wing portion 2 is provided with a projection 3.

[0027] As shown in Figure 3, the main body 1 is a component that supports the wearer's foot 20 from the toes 23 to the heel 25, and has a contour that roughly corresponds to the sole of the wearer's foot 20.

[0028] The shape of the toe-side 4 of the main body 1 shown in Figure 1 should be such that it has sufficient width to rotate the first proximal phalanx 27c shown in Figure 6 toward the medial side of the foot (in the direction of arrow d). In Figure 1, the toe-side 4 has a rounded shape, but it is not limited to this, and for example, the toe-side 4 may have an angular shape, such as a square shape.

[0029] The thickness of the main body 1 can be adjusted as appropriate depending on how the insole 100 is used. When the insole 100 is used alone by being placed inside the shoe 30, it is preferable that it has a thickness sufficient to reduce the pressure applied to the sole of the foot when walking, for example, 3 to 10 mm, preferably 3 to 6 mm. When the insole 100 is used in combination with other insoles (for example, when the insole 100 is used on top of other insoles), it is sufficient that it has a thickness sufficient to ensure strength, for example, 2 to 5 mm.

[0030] In Figure 1, the main body 1 of the insole 100 is formed to have a flat surface and a generally uniform thickness, but thin and thick sections may be provided. For example, if the wearer has a bunion, the big toe is often lowered, so the part corresponding to the big toe may be made relatively thinner than the other parts to create a recess, and the big toe may be configured to fit into that recess. Alternatively, the part corresponding to the arch 24 of the foot, as shown in Figure 3, may be made relatively thicker than the other parts to support the arch of the foot 24.

[0031] The main body 1 may have a single-layer structure or a multi-layer structure of two or more layers.

[0032] The main body 1 is preferable because it possesses appropriate elasticity, flexibility, strength, and durability, making it easy to install inside shoes, reducing pressure on the soles of the feet during walking, and allowing for repeated use.

[0033] The 25% compressive load of the main body 1 is, for example, 0.03 to 0.4 MPa, more preferably 0.04 to 0.3 MPa, even more preferably 0.04 to 0.2 MPa, particularly preferably 0.04 to 0.1 MPa, and most preferably 0.05 to 0.1 MPa. The 25% compressive load in this invention is a value measured in accordance with JIS K 6254.

[0034] The density of the main body 1 is, for example, 0.10 to 0.40 g / cm³. 3 Therefore, 0.20~0.40 g / cm³ 3 Preferably, 0.20-0.35 g / cm³ 3 This is more preferable. The density in this invention is a value measured in accordance with JIS K 6401.

[0035] There are no particular restrictions on the materials that make up the main body 1. Examples include foamed polyurethane resin, silicone resin, acrylic elastomer, polybutadiene elastomer, styrene elastomer (e.g., styrene-butadiene elastomer, styrene-isoprene elastomer, hydrogenated styrene elastomer, etc.), olefin elastomer, ester elastomer, ethylene-vinyl acetate copolymer resin, rubber, latex, cork, etc. These can be used individually or in combination of two or more.

[0036] The wing portion 2 is a member that supports the projection 3, which will be described later, so that it can press against the abductor hallucis muscle 21 of the wearer's foot 20 at the thickened portion 21a of the abductor hallucis muscle 21.

[0037] As shown in Figure 1, the wing portion 2 is located near the heel side 5 of the inner foot peripheral edge 6 of the main body portion 1, and as shown in Figures 3 and 4, it is provided to protrude from the main body portion 1 at a position corresponding to the arch 24 to the heel 25 of the wearer's foot 20.

[0038] As shown in Figure 4, the wing portion 2 is a member that rises along the inner wall of the shoe 30 when the insole 100 is laid inside the shoe 30, and it is preferable that the main body portion 1 and the wing portion 2 are configured to bend easily at their boundary 7.

[0039] In this easily bendable configuration, as shown in Figure 2, on the surface side of the insole 100 (i.e., the side of the insole 100 that faces the wearer's sole), the thickness on the wing portion 2 side of the boundary 7 is thinner than the thickness on the main body portion 1 side of the boundary 7, and a step is formed at the boundary 7.

[0040] The configuration of the boundary 7 on the surface side of the insole 100 is not limited to the above configuration, and for example, a V-shaped cutout (V-notch) with a cross-section may be provided along the boundary 7.

[0041] On the underside of the insole 100 (i.e., the side of the insole 100 that faces the sole of the shoe), there are no steps or notches at the boundary 7 between the main body 1 and the wing portion 2; it is flat.

[0042] In this embodiment, the insole 100 has the above configuration at the boundary 7 between the main body 1 and the wing portion 2. Therefore, when the insole 100 is placed inside the shoe 30, the wing portion 2 can be smoothly folded and raised along the boundary 7 towards the surface side of the insole 100. Furthermore, stress is generated in the wing portion 2 that is folded at the boundary 7, causing it to return to a flat state. As shown in Figures 4 and 5, the wing portion 2 is pressed against the inner wall of the shoe 30 by this stress. In addition, the raised wing portion 2 follows the step or V-shaped notch of the boundary 7, preventing it from collapsing inward into the shoe 30. As a result, the wing portion 2 can be made to adhere closely to the inner wall of the shoe 30, and the wing portion 2 can be prevented from collapsing inward into the shoe 30, so the wing portion 2 does not get in the way when the wearer puts their foot 20 in.

[0043] The shape of the wing portion 2 is, in Figure 1, a roughly triangular shape with one side being the boundary 7 with the main body portion 1 [more specifically, the boundary 7 of the contour shape from the position corresponding to the arch 24 (see Figure 3) of the wearer's foot 20 to the position corresponding to the heel 25], but it is not limited to this shape. As shown in Figures 4 and 5, when the insole 100 is laid inside the shoe 30, the wing portion 2 rises along the inner wall of the shoe 30 and can support the projection 3 described later, and does not hinder the wearer when putting the shoe 30 with the insole 100 on their foot 20, and should allow for smooth putting on, and may be a roughly quadrilateral such as a trapezoid.

[0044] The width w of the wing portion 2 shown in Figure 2 (the length of the wing portion 2 in a direction parallel to the width direction of the main body portion 1) is not particularly limited as long as it is a width that does not exceed the opening (topline) of the shoe 30 when the insole 100 is laid inside the shoe 30 as shown in Figure 5, and as long as it is a width that can support the projection 3, which will be described later, in a position where it can press against the abductor hallucis muscle 21 of the wearer's foot 20 at the thickened portion 21a, as shown in Figure 4.

[0045] The thickness of the wing portion 2 is preferably such that it has sufficient strength to support the projection 3 described later, does not interfere with the wearer's foot 20 putting on the shoe 30 with the insole 100 installed, and does not cause the wearer's foot 20 to feel any pressure. For example, it is 2 to 5 mm, preferably 2 to 3 mm.

[0046] The wing portion 2, like the main body portion 1, preferably possesses appropriate elasticity, flexibility, strength, and durability. The 25% compression load of the wing portion 2 is, for example, 0.03 to 0.4 MPa, more preferably 0.04 to 0.3 MPa, even more preferably 0.04 to 0.2 MPa, particularly preferably 0.04 to 0.1 MPa, and most preferably 0.05 to 0.1 MPa.

[0047] The density of the feather portion 2 is, for example, 0.10 to 0.40 g / cm³. 3 Therefore, 0.20~0.40 g / cm³ 3 Preferably, 0.20-0.35 g / cm³ 3 This is preferable.

[0048] Examples of materials that can be used to make up the wing portion 2 are the same as those used to make up the main body portion 1.

[0049] The wing portion 2 is provided with a projection 3 that protrudes perpendicularly from the surface of the wing portion 2. The projection 3 is a member for pressing the abductor hallucis muscle 21 of the foot 20 of the shoe wearer against the thickened portion 21a.

[0050] The position in which the projection 3 is provided on the wing portion 2 is such that, as shown in Figures 3 and 4, when the shoe 30 with the insole 100 laid on it is fitted to the wearer's foot 20, the projection 3 can press against the thick portion 21a of the abductor hallucis muscle 21 of the wearer's foot 20, and more preferably, it is such that it can press from the medial side in a lateral direction (a direction approximately parallel to the ground).

[0051] Here, on the inner side of the wearer's foot 20, the position corresponding to the side surface of the thick part 21a of the abductor hallucis muscle 21 varies depending on the body shape of the wearer's foot 20 and the like, but is generally about 20 to 40 mm above the sole. Therefore, as shown in FIG. 5, the installation position of the protrusion 3 in the wing part 2 is preferably at a position where the height h1 from the surface of the main body part 1 to the axis of the protrusion 3 is about 20 to 40 mm when the insole 100 is laid in the shoe 30 and the wing part 2 is raised along the inner wall.

[0052] As shown in FIG. 2, it is preferable that the top 3t of the protrusion 3 is flat or convexly curved in that it can reliably press the abductor hallucis muscle 21 at the thick part 21a.

[0053] The area of the top 3t of the protrusion 3 is, for example, 100 to 500 mm 2 . When the area of the top 3t is 100 mm 2 or more, the abductor hallucis muscle 21 of the wearer's foot 20 can be more reliably pressed at the thick part 21a. Also, when the area of the top 3t is 500 mm 2 or less, the pressure (load per unit area) applied to the abductor hallucis muscle 21 can be increased, so that an effective load can be applied to the abductor hallucis muscle 21, and the recovery efficiency of the contraction force of the abductor hallucis muscle 21 can be increased.

[0054] Also, the top view shape of the top 3t of the protrusion 3 and the shape of the cross section of the protrusion 3 (that is, the cross section parallel to the surface of the wing part 2) are preferably substantially circular in terms of ease of manufacture. The protrusion 3 of the present embodiment is a substantially frustum of a cone as shown in FIG. 4, and as shown in FIG. 2, the side surface 3s has a convex arc surface shape on the outside. However, the shape of the side surface 3s is not limited to this, and for example, it may be a planar shape or a concave arc surface shape on the inside.

[0055] The height h2 of the projection 3 is such that it does not interfere with the wearer putting their foot 20 into the shoe 30 after the insole 100 has been laid inside the shoe 30, and when the shoe 30 is fitted onto the wearer's foot 20, the projection 3 should be able to firmly press against the abductor hallucis muscle 21 of the wearer's foot 20 at the thickened portion 21a, as shown in Figures 3, 4, and 5. The height h2 of the projection 3 can be appropriately adjusted according to the shape of the shoe 30 and the thickness of the wing portion 2, for example, 5 to 15 mm, preferably 6 to 13 mm, and more preferably 8 to 12 mm.

[0056] The hardness of the projection 3 is preferably softer than that of the main body 1 and the wing portion 2. The 25% compressive load of the projection 3 at 25°C is, for example, 0.01 to 0.1 MPa, preferably 0.01 to 0.05 MPa, and particularly preferably 0.01 to 0.03 MPa.

[0057] The difference between the 25% compressive load of the main body 1 and the 25% compressive load of the projection 3 is, for example, 0.01 MPa or more, preferably 0.02 MPa or more, and particularly preferably 0.03 MPa or more. The upper limit of the difference between the 25% compressive load of the main body 1 and the 25% compressive load of the projection 3 is, for example, 0.18 MPa, preferably 0.15 MPa, and more preferably 0.1 MPa.

[0058] With this level of hardness, the protrusion 3 can effectively press on the abductor hallucis muscle 21 without causing pain to the wearer's foot 20, thereby eliciting excellent contractile force.

[0059] The density of projection 3 is, for example, 0.15 to 0.25 g / cm³. 3 Therefore, 0.18~0.23 g / cm³ 3 It is preferable.

[0060] Examples of materials that can make up the protrusion 3 are the same as those that make up the main body 1.

[0061] The insole 100 may also have a second wing portion 13 that extends from the main body 1, positioned closer to the heel side 5 of the outer foot peripheral edge 12 of the main body 1, and approximately symmetrical to the wing portion 2 with respect to the main body 1, as shown in the insole 100' in Figure 7.

[0062] The second wing portion 13 rises along the inner wall of the shoe 30 when the insole 100' is laid inside the shoe 30, and is a member that faces the wing portion 2, which also rises along the inner wall of the shoe 30, with the main body portion 1 in between. It is preferable that the second wing portion 13 has the same configuration as the wing portion 2, except that it does not have a projection 3.

[0063] In a wearer suffering from bunions, the first toe of the foot 20 is bent in a "V" shape at the metatarsophalangeal joint 27, resulting in a wider metatarsophalangeal joint area. Therefore, shoes must be selected to match the width of the metatarsophalangeal joint area. However, shoes with a wide metatarsophalangeal joint area also have a wide heel, which may be too wide for the wearer's foot 20. With shoes that have a heel that is too wide, a gap is created between the heel of the wearer's foot 20 and the shoe, making it difficult to obtain the pressing effect of the protrusion 3. However, by using an insole 100' with a second wing portion 13, the second wing portion 13 fills the gap between the heel and the shoe, allowing the protrusion 3 to effectively press against the wearer's foot 20, thereby enhancing the corrective effect of bunions.

[0064] Insoles 100 and 100' can be manufactured using methods appropriate to the material. For example, insoles 100 and 100' made of foamed polyurethane resin can be manufactured by integral molding, which involves filling a mold with foamed particles and then heating, foaming, and fusing the foamed particles. Alternatively, it can also be manufactured by press-molding a sheet of foam. Furthermore, it can also be manufactured by cutting and bonding sheet-shaped foam, or by machining sheet-shaped foam.

[0065] (Insole 101, a modified example of Embodiment 1) Insole 101 is the same as insoles 100 and 100', except that the shape of the toe side 4 of the main body 1 is different.

[0066] The main body 1 of the insole 101 includes a first part 1a and a second part 1b that are adjacent to each other, as shown in Figure 8. The first part 1a is located on the toe side 4 of the main body 1, and the second part 1b is located on the heel side 5 of the first part 1a.

[0067] As shown in Figure 9, the first part 1a includes at least the parts corresponding to the metatarsal head 27a to the distal phalanx 27b of the first toe (i.e., the metatarsal head 27a, the proximal phalanx 27c, and the distal phalanx 27b), and the distal phalanges of the second and subsequent toes, specifically the parts corresponding to the distal phalanx 28a of the second toe, the distal phalanx 28b of the third toe, and the distal phalanx 28c of the fourth toe, when the wearer of the shoe places their foot 20 on the main body 1. The first part 1a may further include the part corresponding to the distal phalanx 28d of the fifth toe.

[0068] In the insole 101, as shown in Figure 9, a single continuous first portion 1a is formed that includes a total of four locations: the area corresponding to the metatarsal head 27a to the distal phalanx 27b of the first toe, the area corresponding to the distal phalanx 28a of the second toe, the area corresponding to the distal phalanx 28b of the third toe, and the area corresponding to the distal phalanx 28c of the fourth toe. However, the configuration is not limited to this. For example, the four locations may each independently form four first portions 1a, or two to three first portions 1a may be formed that include any of the four locations together.

[0069] In the insole 101, as shown in Figure 9, the tip of the toe-side 4 of the first portion 1a extends to the tip of the toe-side 4 of the main body portion 1. However, the insole is not limited to this configuration, and there may be portions other than the first portion 1a on the toe-side 4.

[0070] The second portion 1b preferably includes, as shown in Figure 9, at least the portion corresponding to the base 27d of the first toe metatarsal bone, the portion corresponding to the head 29a of the second toe metatarsal bone, the portion corresponding to the head 29b of the third toe metatarsal bone, the portion corresponding to the head 29c of the fourth toe metatarsal bone, and the portion corresponding to the head 29d of the fifth toe metatarsal bone when the wearer places their foot 20 on the main body portion 1.

[0071] Although the main body 1 of the insole 101 is formed only of the first part 1a and the second part 1b as shown in Figure 9, it is not limited to this configuration and may have parts other than the first part 1a and the second part 1b.

[0072] At the boundary between the first portion 1a and the second portion 1b, it is preferable that the endpoint 15 of the medial foot-side peripheral edge 6 of the boundary line 14 between the first portion 1a and the second portion 1b, the endpoint 16 of the lateral foot-side peripheral edge 12 of the boundary line 14, and the point 17 on the boundary line 14 where the second toe makes contact when the wearer places their foot 20 are each provided at specific positions.

[0073] Furthermore, the distance W1 from the endpoint 15 to the line 18L that passes through the toe-side tip 18 of the main body 1 and is parallel to the width direction of the main body 1, and the length W4 of the main body 1, preferably satisfy the following formula (1), and more preferably satisfy the following formula (2). 0.3 ≤ W1 / W4 ≤ 0.5 (1) 0.35 ≤ W1 / W4 ≤ 0.45 (2) For example, if W4 = 26 cm, then W1 is preferably 7.8 to 13 cm, and more preferably 9.1 to 11.7 cm.

[0074] Furthermore, the distance W2 from the endpoint 16 to the line 18L that passes through the toe-side tip 18 of the main body 1 and is parallel to the width direction of the main body 1, and the length W4 of the main body 1, preferably satisfy the following formula (3), and more preferably satisfy the following formula (4). 0.1 ≤ W2 / W4 ≤ 0.4 (3) 0.2 ≤ W2 / W4 ≤ 0.3 (4) For example, if W4 = 26 cm, W2 is preferably 2.6 to 10.4 cm, and more preferably 5.2 to 7.8 cm.

[0075] Furthermore, the distance W3 from point 17 to the line 18L that passes through the toe-side tip 18 of the main body 1 and is parallel to the width direction of the main body 1, and the length W4 of the main body 1, preferably satisfy the following formula (5), and more preferably satisfy the following formula (6). 0.05 ≤ W3 / W4 ≤ 0.2 (5) 0.07 ≤ W3 / W4 ≤ 0.15 (6) For example, if W4 = 26 cm, W3 is preferably 1.3 to 5.2 cm, and more preferably 1.82 to 3.9 cm.

[0076] As shown in Figure 8, the main body 1 of the insole 101 has a step 10 between the first part 1a and the second part 1b (i.e., the boundary between the first part 1a and the second part 1b). The height difference of the step 10 is, for example, 1 to 4 mm. The first part 1a side is lower than the second part 1b side, and the thickness of the first part 1a is thinner than the thickness of the second part 1b.

[0077] In Figure 8, the surfaces of the first part 1a and the second part 1b are formed flat, but they may be given irregularities as needed. For example, the part corresponding to the arch 24 of the foot shown in Figure 3 may be made relatively thicker than the other parts to support the arch of the foot 24. For example, it may have an arch support 19, as in the insole 101' shown in Figure 11 and the insole 101'' shown in Figure 12.

[0078] The insole 101 can be manufactured, for example, by bonding a surface layer 8 (i.e., the layer facing the sole of the wearer's foot) and a backing layer 9, as shown in Figure 13. The surface layer 8 has a shape in which a portion corresponding to the first part 1a is cut out from a contour that roughly corresponds to the sole of the wearer's foot 20. The backing layer 9 has a shape in which a wing portion 2 with a projection 3 is provided at a position closer to the heel side 5 of the medial foot peripheral edge 6 of the contour that roughly corresponds to the sole of the wearer's foot 20. In other words, the first part 1a of the insole 101 is formed only by the backing layer 9 and does not have a surface layer 8. Although Figure 13 shows bonding two layers, the surface layer 8 and the backing layer 9, one or more additional layers may be bonded below the backing layer 9. In other words, the insole 101 is not limited to a two-layer structure, but may be a multi-layer structure of three or more layers.

[0079] As shown in Figure 8, the insole 101 has a step 10 on its main body 1, with the toe side 4 being one step lower. Therefore, when the insole 101 is placed in the shoe 30, a space is created in the lower part of the toe side of the shoe 30. As a result, when the wearer places their foot 20 on the insole 101 placed in the shoe 30, the metatarsal head 27a of the first toe can be unconsciously lowered compared to the metatarsal heads of the second to fifth toes.

[0080] In a foot with hallux valgus, the metatarsal head 27a of the first toe is lower than the metatarsal heads of the second to fifth toes in a natural, non-weight-bearing state. However, by using the insole 101, the wearer's foot 20 can be maintained in its natural, non-weight-bearing state while standing weight can be applied. Therefore, standing weight can prevent the metatarsophalangeal joint 27 of the first toe from protruding further inward and rubbing against the shoe.

[0081] Furthermore, by using insole 101, the distal phalanx 27b can be lowered along with the metatarsal head 27a of the first toe, thereby suppressing unnecessary twisting of the metatarsophalangeal joint 27 and improving the pain reduction effect in the metatarsophalangeal joint 27.

[0082] Furthermore, using insole 101 allows the distal phalanges of the second and subsequent toes to be lowered to the same height as the distal phalanx 27b of the first toe, making it easier to apply force to the foot and providing greater stability to the entire foot. In addition, the step 10 makes it easier for the second and subsequent toes to flex and extend, and as the second and subsequent toes become more mobile, the first toe also becomes more mobile, thus promoting the recovery of motor function.

[0083] (Insole 102, a modified example of Embodiment 1) Insole 102 is the same as insoles 101, 101', and 101”, except that, as shown in Figure 14, the surface layer of the first part 1a of the main body 1 is formed to be lower than the second part 1b, and instead the surface layer of the first part 1a is formed to be softer than the surface layer of the second part 1b, and sinks when pressed, becoming lower than the surface layer of the second part 1b.

[0084] The main body 1 of the insole 102 includes a first part 1a and a second part 1b, as shown in Figure 14. The surface layer 1au of the first part 1a is made of a softer material than the surface layer 1bu of the second part 1b. Therefore, when a shoe wearer places their foot 20 on the main body 1 of the insole 102, the surface of the first part 1a sinks (for example, by 1 to 4 mm) where it contacts the foot 20, becoming lower than the surface of the second part 1b, creating a step.

[0085] The soft material constituting the surface layer 1au of the first part 1a is a material that can create a step when the wearer of the shoe places their foot 20 on it, and the 25% compressive load is, for example, 0.01 to 0.1 MPa, preferably 0.01 to 0.05 MPa, and particularly preferably 0.01 to 0.03 MPa. Furthermore, the difference in the 25% compressive load between the soft material constituting the surface layer 1au of the first part 1a and the material constituting the surface layer 1bu of the second part 1b is, for example, 0.01 MPa or more, preferably 0.02 MPa or more, and particularly preferably 0.03 MPa or more. The upper limit of the difference between the 25% compressive load of the main body 1 and the 25% compressive load of the projection 3 is, for example, 0.4 MPa, preferably 0.2 MPa, and more preferably 0.1 MPa.

[0086] The density of the soft material constituting the surface layer 1au of the first part 1a is, for example, 0.15~0.25 g / cm³. 3 Therefore, 0.18~0.23 g / cm³ 3 It is preferable.

[0087] The insole 102 can be manufactured, for example, by bonding a surface layer 11, which includes a portion 11a corresponding to the surface layer 1au of the first portion 1a and a portion 11b corresponding to the surface layer 1bu of the second portion 1b, to a backing layer 9, as shown in Figures 14 and 15. The surface layer 11 has a contour that roughly corresponds to the sole of the wearer's foot 20. The backing layer 9 is the same as the backing layer 9 of the insole 101. Although Figure 15 shows bonding two layers, the surface layer 11 and the backing layer 9, one or more additional layers may be bonded below the backing layer 9. In other words, the insole 102 is not limited to a two-layer structure, but may be a multilayer structure of three or more layers.

[0088] As described above, when the wearer places their foot 20 on the insole 102, the toe side 4 sinks down, creating a step. Therefore, when the wearer places their foot 20 on the insole 102 placed in the shoe 30, the toe side 4 of the insole 102 sinks down, creating a step, and a space is created in the lower part of the toe side of the shoe 30. As a result, the metatarsal head 27a of the first toe can be accommodated in this space, thereby lowering the metatarsal head 27a of the first toe below the metatarsal heads 29a, 29b, 29c, and 29d of the second to fifth toes.

[0089] Using the insole 102 allows the wearer's foot 20 to be maintained in its natural, non-weight-bearing state while standing weight-bearing is applied. This prevents the metatarsophalangeal joint 27 of the big toe from protruding further inward and rubbing against the shoe due to standing weight-bearing.

[0090] Furthermore, using insole 102 allows the distal phalanx 27b of the first toe to be lowered along with the metatarsal head 27a, thereby suppressing unnecessary twisting of the metatarsophalangeal joint 27 and improving the pain-reducing effect on the metatarsophalangeal joint 27.

[0091] Furthermore, using insole 102 allows the distal phalanges of the second and subsequent toes to be lowered to the same height as the distal phalanx 27b of the first toe, making it easier to apply force to the foot and providing greater stability to the entire foot. In addition, the resulting height difference makes it easier for the second and subsequent toes to flex and extend, and as these toes become more mobile, the first toe also becomes more mobile, thus promoting the recovery of motor function.

[0092] (Insole 200 according to Embodiment 2) The insole 200 according to Embodiment 2 comprises a main body portion 1, as shown in Figure 16. The insole 200 is the same as insoles 101, 101', and 101”, except that it does not have wing portions 2 with projections 3.

[0093] The main body 1 of the insole 200 has a contour that roughly corresponds to the sole of the foot of the person wearing the shoe, as shown in Figure 16, and includes a first part 1a and a second part 1b. The positions and shapes of the first part 1a and the second part 1b in the main body 1 are the same as described above.

[0094] As shown in Figure 16, the main body 1 of the insole 200 has a step 10 between the first part 1a and the second part 1b (i.e., the boundary between the first part 1a and the second part 1b). The height difference of the step 10 is, for example, 1 to 4 mm. The first part 1a side is lower than the second part 1b side, and the thickness of the first part 1a is thinner than the thickness of the second part 1b.

[0095] Since the insole 200 has a step 10 on the toe side 4 of the main body 1, when it is placed in a shoe 30, a space is formed in a lower area on the toe side inside the shoe 30. The metatarsal head 27a of the first toe can be accommodated in this space, thereby lowering the metatarsal head 27a of the first toe compared to the metatarsal heads 29a, 29b, 29c, and 29d of the second to fifth toes.

[0096] Using insole 200 allows the wearer's foot 20 to be maintained in its natural, non-weight-bearing state while standing weight-bearing is applied. This prevents the metatarsophalangeal joint 27 of the big toe from protruding further inward and rubbing against the shoe due to standing weight-bearing.

[0097] Furthermore, using insole 200 allows the distal phalanx 27b of the first toe to be lowered along with the metatarsal head 27a, thereby suppressing unnecessary twisting of the metatarsophalangeal joint 27 and improving the pain reduction effect in the metatarsophalangeal joint 27.

[0098] Furthermore, using insole 200 allows the distal phalanges of the second and subsequent toes to be lowered to the same height as the distal phalanx 27b of the first toe, making it easier to apply force to the foot and providing greater stability to the entire foot. In addition, the step 10 makes it easier for the second and subsequent toes to flex and extend, and as the second and subsequent toes become more mobile, the first toe also becomes more mobile, thus promoting the recovery of motor function.

[0099] (Insole 300 according to Embodiment 3) The insole 300 according to Embodiment 3 comprises a main body portion 1, as shown in Figure 17. The insole 300 is the same as the insole 102 except that it does not have a wing portion 2 with a projection 3.

[0100] The main body 1 of the insole 300 has a contour that roughly corresponds to the sole of the foot of the shoe wearer, as shown in Figure 17, and includes a first part 1a and a second part 1b. The position and shape of the first part 1a and the second part 1b in the main body 1 are the same as described above.

[0101] Furthermore, the surface layer 1au of the first part 1a is made of a softer material than the surface layer 1bu of the second part 1b. Therefore, when a shoe wearer places their foot 20 on the main body 1 of the insole 300, the surface of the first part 1a sinks where it contacts the foot 20 (for example, by 1 to 4 mm), becoming lower than the surface of the second part 1b (or becoming thinner than the surface layer 1bu of the second part 1b), creating a step.

[0102] When the wearer places their foot 20 on the main body 1 of the insole 300, the part of the surface of the first portion 1a that the foot 20 touches sinks in, forming a step. When the wearer places their foot 20 on the insole 300 that has been placed in the shoe 30, the toe side 4 of the insole 300 sinks in, creating a step and a space one step lower on the toe side of the shoe 30. The metatarsal head 27a of the first toe can then be accommodated in this space, thereby lowering the metatarsal head 27a of the first toe compared to the metatarsal heads 29a, 29b, 29c, and 29d of the second to fifth toes.

[0103] Using insole 300 allows the wearer's foot 20 to be maintained in its natural, non-weight-bearing state while standing weight-bearing is applied. This prevents the metatarsophalangeal joint 27 of the big toe from protruding further inward and rubbing against the shoe due to standing weight-bearing.

[0104] Furthermore, using insole 300 allows the distal phalanx 27b to be lowered along with the metatarsal head 27a of the first toe, thereby suppressing unnecessary twisting of the metatarsophalangeal joint 27 and improving the pain reduction effect in the metatarsophalangeal joint 27.

[0105] Furthermore, using the Insole 300 allows you to lower the distal phalanges (27b) of the big toe, and simultaneously lower the distal phalanges of the second and subsequent toes to the same height. This makes it easier to apply force to the foot and provides greater stability to the entire foot. Additionally, the resulting height difference makes it easier for the second and subsequent toes to flex and extend, and this increased mobility of the second and subsequent toes also improves the mobility of the big toe, thus promoting the recovery of motor function.

[0106] [shoes] The shoe 30 of the present invention comprises the above-mentioned insoles 100, 100', 101, 101', 101”, 102, 200, or 300. Figures 4 and 5 show the case in which the shoe 30 of the present invention comprises the insole 100.

[0107] As for shoes 30, there are no particular restrictions as long as they are shaped to accommodate insoles 100, 100', 101, 101', 101”, 102, 200, or 300 inside. Examples include sneakers, business shoes, casual shoes, medical shoes, athletic shoes, hiking boots, pumps, sandals, slip-ons, boots, and indoor shoes.

[0108] Among the shoes 30, a shoe with a wide toe area is preferred, which has a shape that allows the first proximal phalanx 27c shown in Figure 6 to rotate inward, thereby securing space to abduct the metatarsophalangeal joint 27 of the first toe, and which can be fitted snugly to the wearer's foot 20 by shoelaces or equivalent means.

[0109] When the shoe 30 of the present invention is equipped with an insole 100 or insole 100', the projection 3 on the insole 100 or insole 100' effectively presses against the abductor hallucis muscle 21 on the wearer's foot 20 as shown in Figure 6, thereby increasing its contractile force. As a result, even in the foot 20 of an elderly person or other wearer whose abductor hallucis muscle 21 has weakened, wearing the shoe 30 significantly restores the contractile force of the abductor hallucis muscle 21. This causes the abductor hallucis muscle 21 to pull its attachment to the first proximal phalanx 27c toward the calcaneus 26 (direction of arrow c in Figure 6), rotating the first proximal phalanx 27c toward the medial foot (direction of arrow d in Figure 6), and abducting the metatarsophalangeal joint 27 of the first toe (rotating in the direction of arrow d in Figure 6). This corrects hallux valgus. Therefore, the shoe 30 of the present invention is excellent in preventing bunions and improving the symptoms of bunions.

[0110] When the shoe 30 of the present invention is equipped with an insole 101, 101', or 101”, the projection 3 provided on the insole 101, 101', or 101'' effectively presses against the abductor hallucis muscle 21 in the wearer's foot 20, thereby increasing its contractile force. Therefore, the shoe 30 of the present invention is excellent in preventing bunions and improving the symptoms of bunions.

[0111] Furthermore, since the insoles 101, 101', or 101'' have a step 10 and the toe side 4 is one step lower, the shoe 30 equipped with the insoles 101, 101', or 101'' has a space at the lower part of the toe side. Therefore, when the wearer's foot 20 is placed on the insoles 101, 101', or 101'' placed in the shoe 30, the natural state of the foot when not bearing weight can be maintained even when standing and bearing weight. Therefore, by using shoes 30 equipped with insoles 101, 101', or 101'', it is possible to walk with the foot 20 in its natural state when not bearing weight. This prevents the metatarsophalangeal joint 27 of the first toe from protruding further inward and rubbing against the shoe. Furthermore, using shoes 30 equipped with insoles 101, 101', or 101'' makes it easier to apply force to the foot, thus stabilizing the entire foot. In addition, the step 10 makes it easier to flex and extend the second and subsequent toes, and by making the second and subsequent toes more mobile, the recovery of motor function of the first toe is promoted.

[0112] When the shoe 30 of the present invention is equipped with an insole 102, the projection 3 on the insole 102 effectively presses against the abductor hallucis muscle 21 in the wearer's foot 20, thereby increasing its contractile force. Therefore, the shoe 30 of the present invention is excellent in preventing bunions and improving the symptoms of bunions.

[0113] Furthermore, when a wearer places their foot 20 on the insole 102, the part of the surface layer 1au of the first portion 1a that comes into contact with the foot 20 sinks down, creating a step. As a result, when a wearer places their foot 20 on a shoe 30 equipped with the insole 102, a space is created at a lower level on the toe side. Therefore, when a wearer places their foot 20 on the insole 102 placed in the shoe 30, the natural state of the foot when not bearing weight can be maintained even when standing and bearing weight. Therefore, by using shoes 30 equipped with insoles 102, it is possible to walk with the foot 20 in its natural state when not bearing weight. This prevents the metatarsophalangeal joint 27 of the first toe from protruding further inward and rubbing against the shoe. Furthermore, using shoes 30 equipped with insoles 102 makes it easier to apply force to the foot, thus stabilizing the entire foot. In addition, the difference in height makes it easier to flex and extend the second and subsequent toes, and this increased mobility of the second and subsequent toes promotes the recovery of motor function in the first toe.

[0114] When the shoe 30 of the present invention is equipped with an insole 200, the insole 200 has a step 10, and the toe side 4 is one step lower, so the shoe 30 equipped with the insole 200 has a space in the lower part at the toe side. Therefore, when the wearer's foot 20 is placed on the insole 200 placed in the shoe 30, the natural state of the foot when not bearing weight can be maintained even when standing and bearing weight. Therefore, by using shoes 30 equipped with insoles 200, it is possible to walk with the foot 20 in its natural state when not bearing weight. This prevents the metatarsophalangeal joint 27 of the first toe from protruding further inward and rubbing against the shoe. Furthermore, using shoes 30 equipped with insoles 200 makes it easier to apply force to the foot, thus stabilizing the entire foot. In addition, the step 10 makes it easier to flex and extend the second and subsequent toes, and by making the second and subsequent toes more mobile, the recovery of motor function of the first toe is promoted.

[0115] When the shoe 30 of the present invention is equipped with an insole 300, when the wearer places their foot 20 on the insole 300, the portion of the surface layer 1au of the first part 1a that comes into contact with the foot 20 sinks in, creating a step, and a space is formed at a lower level on the toe side 4 of the shoe 30. Therefore, when the wearer's foot 20 is placed on the insole 300 laid in the shoe 30, the natural state of the foot can be maintained even when standing and bearing weight, as it is when not bearing weight. Therefore, by using shoes 30 equipped with insoles 300, it is possible to walk with the foot 20 in its natural state when not bearing weight. This prevents the metatarsophalangeal joint 27 of the first toe from protruding further inward and rubbing against the shoe. Furthermore, using shoes 30 equipped with insoles 300 makes it easier to apply force to the foot, resulting in greater overall foot stability. In addition, the difference in height makes it easier to flex and extend the second and subsequent toes, and this increased mobility of the second and subsequent toes promotes the recovery of motor function in the first toe.

[0116] The configurations and combinations thereof described above are merely examples, and additions, omissions, substitutions, and modifications to the configurations are permitted as appropriate, without departing from the spirit of the present invention. Furthermore, the present invention is not limited by its embodiments. [Explanation of Symbols]

[0117] 100, 100', 101, 101', 101”, 102, 200, 300 Insoles 1. Main body 1a First part of the main body 1b Second part of the main body 2 feather section 3 protrusions 3t Top of the protrusion 3s Side of the protrusion 4 Toe side 5. Heel side 6. Peripheral area of ​​the medial foot 7. Boundary between the main body and the wing section 8. Surface layer of insole 101 9. Underlayer 10 steps 11. Surface layer of insole 102 11a First part of surface layer 11 11b Second part of surface layer 11 12. Peripheral area of ​​the outer foot 13 Second Wing Section 14 Boundary line between the first part 1a and the second part 1b of the main body 15. End point on the inner foot side of boundary line 14 16 Outer foot end point of boundary line 14 17. The point on boundary line 14 where the wearer's second toe makes contact with the surface. 18 The tip of the main body part 1 on the toe side 18L A line passing through the toe-side tip 18 of the main body 1 and parallel to the width direction of the main body 1 19 Arch Support 20 The feet of the shoe wearer 21 Abductor hallucis muscle of the foot of a shoe wearer 21a Thickened portion of the abductor hallucis muscle 23 Toes 24. Arch of the foot 25 Heel 26 Calcaneus 27 Metatarsophalangeal joint of the first toe 27a Metatarsal head of the first toe 27b Distal phalanx of the first toe 27c Proximal phalanx of first toe (first proximal phalanx) 27d Base of the metatarsal bone of the first toe 28a Distal phalanx of the second toe 28b Distal phalanx of the third toe 28c Distal phalanx of the fourth toe 28d Distal phalanx of the fifth toe 29a Metatarsal head of the second toe 29b Metatarsal head of the third toe 29c Metatarsal head of the fourth toe 29d Metatarsal head of the fifth toe 30 shoes h1 Height from the surface of the main body to the axis of the projection h2 Height of the protrusion w width of the wing

Claims

1. An insole that is placed inside a shoe, The main body of the shoe supports the wearer's foot from the toes to the heel, The insole is provided on the heel-side peripheral edge of the main body and, when placed inside the shoe, has a wing-like portion that rises along the inner wall of the shoe. The wing portion of the insole is provided with a projection that presses against the thickest part of the abductor hallucis muscle of the foot of the shoe wearer.

2. The insole according to claim 1, wherein the 25% compressive load of the projection is 0.01 to 0.1 MPa.

3. The insole according to claim 1, wherein the top of the projection is flat or curved convex.

4. The main body includes a first portion that includes the area corresponding to the metatarsal head to the distal phalanx of the first toe and the distal phalanx of the second to fourth toes when the wearer places their foot on the main body, and a second portion adjacent to the first portion on the heel side of the first portion. The insole according to claim 1, wherein there is a step between the first part and the second part, and the first part is lower than the second part.

5. The main body includes a first portion that includes the area corresponding to the metatarsal head to the distal phalanx of the first toe and the distal phalanx of the second to fourth toes when the wearer places their foot on the main body, and a second portion adjacent to the first portion on the heel side of the first portion. The surface layer of the first part is made of a softer material than the surface layer of the second part. The insole according to claim 1, wherein when a person wearing the shoe places their foot on the main body, the first portion pressed by the foot sinks down and becomes lower than the second portion.

6. An insole that is placed inside a shoe, The shoe features a main body that supports the wearer's foot from the toes to the heel. The main body includes a first portion that includes the area corresponding to the metatarsal head to the distal phalanx of the first toe and the distal phalanx of the second to fourth toes when the wearer places their foot on the main body, and a second portion adjacent to the first portion on the heel side of the first portion. An insole with a step between the first and second parts, where the first part is lower than the second part.

7. An insole that is placed inside a shoe, The shoe features a main body that supports the wearer's foot from the toes to the heel. The main body includes a first portion that includes the area corresponding to the metatarsal head to the distal phalanx of the first toe and the distal phalanx of the second to fourth toes when the wearer places their foot on the main body, and a second portion adjacent to the first portion on the heel side of the first portion. The surface layer of the first part is made of a softer material than the surface layer of the second part. An insole in which, when the wearer places their foot on the main body, the first part pressed by the foot sinks down and becomes lower than the second part.

8. A shoe equipped with an insole according to any one of claims 1 to 7.

Images