Insole core material used to support the feet
By forming raised structures and reinforcing grooves on the upper surface of the insole core material that correspond to the tarsal bones, the problem of existing insoles being unable to precisely adjust the three-dimensional positional relationship is solved, achieving precise correction of the foot bones and improved comfort.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ANTOKU NIS CO LTD
- Filing Date
- 2025-08-08
- Publication Date
- 2026-07-03
AI Technical Summary
Existing insoles cannot precisely adjust the three-dimensional positional relationship of each bone when supporting the foot. They lack a flexible structure, resulting in concentrated support pressure, which affects comfort and athletic adaptability. Furthermore, they do not take into account the thickness of soft tissue, which can easily lead to discomfort and poor corrective effect.
A raised structure corresponding to the tarsal bone is formed three-dimensionally on the upper surface of the insole core material. Combined with reinforcing grooves, the support height is set to follow joint movement and extends to the base of the metatarsal bone. The support surface is optimized using a correction coefficient to ensure natural joint mobility and skeletal correction function.
It achieves precise correction of the foot bone arrangement, preventing falls and poor posture, improving comfort and stability during exercise, avoiding concentrated support pressure, and enhancing the adaptability of footwear.
Smart Images
Figure CN224440536U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to insole core materials for supporting the foot, which are placed on the sole of footwear such as shoes and boots. In particular, it relates to insole core materials for supporting the foot that perform in correcting the tarsal bone arrangement, preventing falls of people wearing footwear, and improving their posture. Background Technology
[0002] Deformation of the joints in the foot can have adverse effects on bones, muscles, and nerves. Therefore, it is desirable to correct these deformities.
[0003] In this regard, techniques are known for using insoles in footwear to correct the shape and bone structure of the feet of people with flat feet, or to maintain left-right and front-back balance.
[0004] For example, the technology disclosed in Japanese Patent No. 6800262 relates to an arch-shaped insole having a support structure corresponding to the portion from the calcaneus to the tarsometatarsal joint. However, this technology lacks the function of individually adjusting the support height for each part of the foot in accordance with the structure of each tarsal bone, and also suffers from the problem of not having a flexible structure that follows the movable parts of the joint.
[0005] Japanese Patent No. 4733957 discloses an insole structure that stabilizes the foot bones by supporting the cuboid bone within the tarsal bones. However, it does not disclose a three-dimensional support structure for other tarsal bones.
[0006] Japanese Patent No. 5498631 describes an internal support structure for footwear corresponding to the cuboid and calcaneus bones. However, it lacks a support height adjustment mechanism that takes into account the bone height and soft tissue thickness of each part. Therefore, it is insufficient to correctively guide the overall skeletal integrity.
[0007] Japanese Patent Application Publication No. 2017-23706 discloses a technology for insoles that prevent obstruction by placing pads at positions corresponding to specific parts of the sole of the foot. However, it lacks an inter-tarsal alignment correction mechanism and a flexible structure corresponding to joint mobility.
[0008] Thus, in known technologies, there is no way to simultaneously achieve natural mobility and stability of the joint track by three-dimensionally and quantitatively correcting the overall skeletal alignment of the tarsal bones. Utility Model Content
[0009] Problems to be solved by utility models
[0010] While these known insoles do have structures that support part or all of the tarsal bones, they do not achieve a precise adjustment of the different three-dimensional positions and support heights of each bone in the foot. Therefore, the known technology as a means to actively and quantitatively induce the alignment of the foot's bones through insoles is problematic.
[0011] Furthermore, most known technologies lack flexible structures that allow for the movement of joints that follow the bones of the foot, offering only support in specific areas. Therefore, they are insufficiently adaptable to twisting, flexing, and other movements during walking.
[0012] Furthermore, there is no known technology for insoles that optimizes the height of the support surface by taking into account the thickness of soft tissues such as muscles, tendons, and fat layers in the sole of the foot. In known insoles, problems such as concentrated support pressure, discomfort for the user, and inconsistent corrective effects are common.
[0013] The purpose of this invention is to provide a core material that quantitatively sets the foot's support surface based on the three-dimensional configuration of the tarsal bones and the composition of soft tissue, thereby balancing natural joint mobility and skeletal correction function. Specifically, this invention aims to actively correct the overall skeletal arrangement of the foot by obtaining a core material with a support shape corresponding to the seven tarsal bones (calcaneus, talus, cuboid, navicular, first cuneiform, second cuneiform, and third cuneiform), thereby preventing falls and poor posture caused by flat feet and excessive pronation (overpronation) in footwear wearers.
[0014] Solution for solving the problem
[0015] According to a first aspect of this invention, a three-dimensional ridge corresponding to the position and height of the tarsal bones (calcaneus, talus, cuboid, scaphoid, and the first to third cuneiform bones) is formed on the upper surface of the core material. This provides corrective support for the skeletal alignment. For example, a protrusion is formed in the core material at a position corresponding to the lower part of the cuboid bone, which functions as a corrective fulcrum supporting the other tarsal bones.
[0016] According to a second aspect of the present invention, a following groove and / or following ridge are formed in three dimensions on the upper surface of the core material, arranged along the tarsometatarsal joint and transverse tarsal joint of the foot, thereby flexibly following the flexion, internal rotation and external rotation movements of the foot.
[0017] According to a third aspect of this invention, one or more reinforcing grooves are provided on the upper or lower surface of the core material. By utilizing this configuration with reinforcing grooves, the overall rigidity and buckling flexibility of the core material can be controlled, thereby ensuring the dispersion of foot pressure.
[0018] According to a fourth aspect of this invention, the core material extends not only to the tarsal bone but also to the base of the metatarsal bone. This allows it to provide support without hindering joint movement.
[0019] According to a fifth aspect of the present invention, the set height of the bone support surface of the core material is quantitatively determined based on a mathematical formula using correction coefficients and by utilizing the raised shape of the upper surface of the core material that takes into account bone structure and soft tissue thickness.
[0020] The sixth aspect of this utility model relates to a shoe insole. The shoe insole comprises the aforementioned core material.
[0021] The seventh aspect of this utility model relates to footwear. The footwear includes the aforementioned insole.
[0022] According to this invention, a three-dimensional raised portion corresponding to different heights and support positions for each tarsal bone is formed on the upper surface of the core material, thereby enabling active correction of the overall skeletal arrangement of the foot. For example, by using the raised structure below the cuboid bone of the core material as a correction fulcrum, the stability of the arrangement of the scaphoid, cuneiform, talus, etc., can be improved.
[0023] The shape of the core material's support surface can be quantitatively set based on the thickness of the bone structure and soft tissue using a formula with correction coefficients. Therefore, it can flexibly match the shape of each user's foot. This prevents excessive concentration of support pressure on specific areas, ensuring proper tracking of the foot's natural movement.
[0024] With reinforcing grooves formed on the lower surface of the core material, the overall rigidity and flexural balance of the core material can be properly controlled, which helps to disperse torsional stress and foot pressure when the wearer of shoes equipped with the core material is walking.
[0025] The core material can extend to the base of the metatarsal bones. In this case, the core material provides support without compromising the mobility of the tarsometatarsal and transverse tarsal joints. Thus, the footwear provides both stable support and high comfort during walking and exercise. Attached Figure Description
[0026] Figure 1 It is a top view showing the bones of a person's right foot.
[0027] Figure 2 It is a side view showing the bones of a person's right foot.
[0028] Figure 3 This is a top view of the core material of the first and second embodiments of this utility model.
[0029] Figure 4 This is an illustration of the first embodiment of the present invention. Figure 3A diagram of the cross-sections of each cross-section line.
[0030] Figure 5 This is along the first embodiment of the present invention. Figure 3 A cross-sectional view of the EE line.
[0031] Figure 6 This is an illustration of the second embodiment of the present invention. Figure 3 A diagram of the cross-sections of each cross-section line.
[0032] Figure 7 This is along the second embodiment of the present invention. Figure 3 A cross-sectional view of the EE line.
[0033] Figure 8 This is a top view showing the superimposed bones of a person's right foot onto the core material of an embodiment of this invention.
[0034] Figure 9 This is a side view showing the bones of a person's right foot superimposed on the core material of an embodiment of this utility model.
[0035] Figure 10 This is a top view of the core material of an embodiment of this utility model.
[0036] Figure 11 This is a side view of the core material of an embodiment of this utility model.
[0037] Figure 12 This is a bottom view of the core material of an embodiment of this utility model.
[0038] Figure 13 It is a cross-sectional shape diagram of the core material with the correction factor set to 40% (α = 0.4).
[0039] Figure 14 It is a cross-sectional shape diagram of the core material with the correction factor set to 0% (α=0).
[0040] Figure 15 It is a cross-sectional shape diagram of the core material that makes the parts corresponding to the cuboid bone, the third cuneiform bone, and the scaphoid bone protrude.
[0041] Figure 16 This is a bottom view of the core material with anti-slip components installed.
[0042] Figure 17 Viewed from the lower side Figure 16 A diagram of the core material. Detailed Implementation
[0043] To illustrate the structure and function of the core material in the embodiments of this utility model, the bones of the foot will be described in detail first.
[0044] Figure 1 This is a top view of the bones of the human foot. However, because the bones in the foot overlap each other vertically, it is difficult to see clearly. Figure 1 The illustration of a portion of the bone located in the lower layer is omitted. Figure 2 It is a side view of the bones of a human foot.
[0045] like Figure 1 As shown, the foot is mainly composed of the following bones: 1. calcaneus, 2. talus, 3. cuboid, 4. scaphoid, 5. 1-3 cuneiform bones, 6. 1-5 metatarsals, 7. 1-5 proximal phalanges, 8. 2-5 middle phalanges, 9. 10. 11. proximal phalange of the big toe, 12. distal phalange of the big toe.
[0046] The calcaneus (1), talus (2), cuboid (3), scaphoid (4), and cuneiformes (1st to 3rd) – these seven bones are collectively called the tarsal bones. Additionally, the 1st to 5th metatarsals (6) are collectively called the metatarsals. The 1st to 5th proximal phalanges (7), 2nd to 5th middle phalanges (8), and 1st to 5th distal phalanges (9) – these fourteen bones are collectively called the phalanges.
[0047] The calcaneus (1) functions to correct eversion and inversion. The talus (2) functions to correct excessive pronation and supination of the foot. The cuboid (3) functions to stabilize the transverse arch of the foot. The navicular (4) functions to maintain the medial arch of the foot. The three cuneiform bones (5) function to adjust the proper arrangement of the forefoot.
[0048] The five metatarsal bones play a crucial role in the formation of the longitudinal and transverse arches of the foot. The proximal phalanges work in conjunction with the toes to help absorb impact during walking and generate propulsive force when pushing off the ground.
[0049] The middle phalanx 8 helps the toes move smoothly and distributes weight pressure upon landing, contributing to maintaining balance. The distal phalanx 9 maintains postural stability through direct contact with the ground and supports the flexion and extension movements of the toes, thus enabling flexible responses to walking movements.
[0050] Figure 1 and Figure 2 The tarsometatarsal joint 12 (between metatarsal 6, cuneiform 5, and cuboid 3) and the chopart joint 13 (between scaphoid 4, calcaneus 1, and talus 2) shown are the main joints involved in movements such as flexion, internal rotation, external rotation, and twisting of the foot. The natural mobility of these joints is known to be important for walking.
[0051] The insole core material of this invention has a three-dimensional raised structure formed on its upper surface that corresponds to the three-dimensional arrangement of the tarsal bones and the height at which each bone should be supported. This allows the insole core material to actively correct the arrangement of the foot's bones.
[0052] In the insole core material of this utility model, the height of the support surface corresponding to each tarsal bone (calcaneus 1, talus 2, cuboid 3, navicular bone 4, cuneiform bone 5) is quantitatively set by the following correction formula (1).
[0053] T(i)={Hbone(i)-Hsoft(i)}×(1-α)····(1)
[0054] Here, T(i) is the set height of the upper surface of the core material, Hbone(i) is the reference height of the bone, Hsoft(i) is the thickness of the soft tissue (including at least one of muscle, tendon, and fat layers), and α is the correction coefficient. The correction coefficient α is set to a certain extent according to each individual bone, disease, and material characteristic. For example, when α is set to 0.4, it becomes a setting that leaves a 40% correction gap relative to the difference between the bone height and the soft tissue thickness. Thus, it is possible to balance the comfort of the wearer and the skeletal guidance effect when using insole core materials.
[0055] The corrective gap mentioned here refers to, for example, Figure 9 As shown, a gap 92 is created between the core material 90 and the foot 91 wearing the shoe on which the core material 90 is placed. By forming this corrective gap, as reiterated above, both the comfort of the wearer provided by the core material 90 and the skeletal guidance effect can be taken into account. It is also important to compare the percentage of the corrective gap with 0%, 75%, etc. When the core material 90 is applied to the shoe, an insole containing the core material 90 is placed in the shoe. At this time, the gap 92 is filled by the material constituting the insole.
[0056] For example, when the gap is 0% (α = 0), soft tissue deformation cannot be allowed, and wearers of shoes with core materials are prone to feeling pressure, impaired blood circulation, and discomfort due to overcorrection. When the gap is 75% (α = 0.75), the support provided by the core material is insufficient, and the arch structure of the foot is unstable, which leads to wobbling during walking and reduced correction effect.
[0057] In contrast, the correction gap of approximately 40% (α≈0.4) preferred in this invention is a setting that, based on multiple trial production evaluations and biomechanical analysis, avoids the concentration of support pressure while maintaining a suitable correction force. "Approximately 40%" means, for example, a range of 30% to 50%, preferably a range of 35% to 45%.
[0058] The height of the support surface of the core material corresponding to each bone is quantitatively determined based on the bone structure and the thickness of the soft tissue. Specifically, the reference height of the lower end of the bone is set as the first value (Hbone), and the thickness of the soft tissue, including the muscle and fat layers, is set as the second value (Hsoft).
[0059] In the core material, the settings for each part, with the calcaneus 1 as a reference (0mm), are as follows.
[0060] 2. Talus: The first value is approximately 35.0 mm, and the second value is approximately 25.0 mm.
[0061] Scaphoid 4: The first value is approximately 26.0 mm, and the second value is approximately 7.5 mm.
[0062] First cuneiform bone 5: The first value is approximately 21.0 mm, and the second value is approximately 7.0 mm.
[0063] Second cuneiform 5: The first value is approximately 17.5 mm, and the second value is approximately 5.0 mm.
[0064] The third cuneiform bone has the following dimensions: the first value is approximately 15.0 mm, and the second value is approximately 7.0 mm.
[0065] Dice bone 3: The first value is approximately 10.0 mm, and the second value is approximately 8.0 mm.
[0066] By setting the corrective gap to approximately 40% in each bone support section of the core material based on these values, it is possible to promote the correction of bone alignment while following natural foot movements, without hindering the deformation and absorption of muscles, tendons, and fat layers.
[0067] In particular, when a ridge as described above forms below the cuboid bone 3, this ridge acts as a corrective fulcrum, stabilizing the transverse arch of the foot.
[0068] The core material is preferably set in Figure 1 and Figure 2 The area marked with shading lines extends from the heel side to the base of the metatarsal 6. Furthermore, the core material preferably has a raised shape formed along the tarsometatarsal joint 12 and the transverse tarsometatarsal joint 13, as well as a following groove and / or following ridge. Moreover, the combination of the aforementioned area marked with shading lines and the aforementioned raised shape formed along the tarsometatarsal joint 12 and the transverse tarsometatarsal joint 13, as well as the following groove and / or following ridge, achieves both mobility and stability.
[0069] On the lower surface of the core material, a pair of reinforcing grooves can be formed side by side. These reinforcing grooves are used to increase the strength of the core material by making its cross-sectional shape more complex. Through the increased strength of the core material resulting from the formation of these reinforcing grooves, the overall balance between the rigidity and flexural strength of the core material can be optimized, and the torsional stress and foot pressure of the user walking in footwear with the core material installed can be dispersed.
[0070] As the core material, rigid thermoplastic resins such as nylon 66 (polyamide-based) are preferred. However, this is not the only option. For example, other rigid or elastic thermoplastic resins such as TPU (thermoplastic polyurethane), EVA (ethylene vinyl acetate), and PU (polyurethane foam) can also be used. When using these materials, by adjusting the setting of the correction coefficient α according to the material properties, the support height for each tarsal bone can be appropriately set, ensuring the desired correction effect and flexibility. The core material can be integrally molded, for example, by injection molding. Two-color molding or insert molding using multiple resins can also be performed as needed.
[0071] The core material of this invention also incorporates the following design: using the user's foot shape scan data and foot pressure distribution information as input values, a three-dimensional contour is automatically generated on CAD. This allows for the creation of personalized insole core materials tailored to individual foot shapes and correction needs.
[0072] The manufacturing method is as follows: First, regarding the user's feet, a 3D scanner or foot pressure sensor is used to obtain foot shape data and foot pressure distribution information. Furthermore, information on the bone positions of the calcaneus 1, talus 2, scaphoid 4, cuboid 3, and cuneiform 5, as well as information on the thickness of soft tissues, is also obtained.
[0073] Based on the obtained data, the support surface height T(i) corresponding to each tarsal bone is calculated using the above correction formula (1). Furthermore, based on the calculated value T(i), each support surface can be set as a smooth three-dimensional curved surface in CAD software. This eliminates localized steps and achieves a uniform distribution of contact pressure between the core material and the sole of the foot. By using a curved surface representation based on NURBS (Non-Uniform Rational B-Spline), localized steps and bends are avoided, and a continuous and natural correction surface that follows the shape of the user's foot is formed. This suppresses discomfort during placement, localized pressure concentration on the sole of the foot, and excessive deviation of the correction force. The setting value of α is preferably a value corresponding to the intended use and material properties. As mentioned above, the setting value of α is typically approximately 40%.
[0074] The defined three-dimensional profile is output in a format such as STL, and this output becomes data for a mold used in the molding of thermoplastic resin.
[0075] During forming, raised structures corresponding to each tarsal bone are formed on the upper surface of the core material, and following grooves and following ridges are particularly preferred to be formed on the lower surface of the core material. This allows for control of the balance between rigidity and buckling.
[0076] After forming, surface finishing and burr removal are performed, and fine adjustments (cutting, attachment of auxiliary materials) can be made based on individual foot pressure information as needed.
[0077] The core material is typically manufactured using the processes described above. Alternatively, any other manufacturing process can be used, as long as a raised structure with a correction factor as shown above is incorporated.
[0078] Figure 3 This is a top view of the core material 90 used in the right foot, showing the common structure of the first or second embodiment of this utility model. The difference between the first and second embodiments is... Figures 4-7 It is clearly shown.
[0079] Figure 4 The shape of the cross-section of the core material 90 is shown in a state where the user does not place their foot on the core material 90 of the first embodiment of the footwear. Here, (a) is along... Figure 3 (b) is a cross-sectional view along line AA. Figure 3 The cross-sectional view of the BB line, (c) is along the BB line. Figure 3 The cross-sectional view of the CC line, (d) is along the CC line. Figure 3 A cross-sectional view of the DD line. The core material 90 has following grooves 31 on its upper and lower surfaces.
[0080] Figure 5 It is along Figure 3 An enlarged cross-sectional view of the EE line. Figure 5 The cross-sectional view also depicts the following trench 31.
[0081] Figure 6 The shape of the cross-section of the core material 90 is shown in a state where the user is not placing their foot on the core material 90 of the second embodiment of footwear. Figure 6 In the middle, (a) is with Figure 4 (a) is a cross-sectional view of the part corresponding to (b), and (b) is a cross-sectional view of the part corresponding to (a). Figure 4 (b) is a cross-sectional view of the part corresponding to it, and (c) is a cross-sectional view of the part corresponding to it. Figure 4 The cross-sectional view of the part corresponding to (c), and (d) and Figure 4 The cross-sectional view of the part corresponding to (d). As shown in the figure, the core material 90 has a following ridge 32 and a following groove 31.
[0082] Figure 7 It is about Figure 6 Core material 90 is shown with Figure 5 Cross-sectional view of the corresponding part. In this... Figure 7 The cross-section shown depicts the following ridge 32.
[0083] Figure 6 and Figure 7 The following protrusion 32 shown is formed on the upper surface of the core material 90, but the following protrusion 32 can also be formed on the lower surface of the core material 90.
[0084] That is, the core material 90 of the first embodiment has a following groove 31, while the core material 90 of the second embodiment has a following protrusion 32. As shown in the figure, the core material 90 of the second embodiment can also have a following groove 31.
[0085] Figure 4 , Figure 5 , Figure 6 , Figure 7 The following groove 31 and following ridge 32 shown are located at Figure 10 The lines depicted in the top view of the core material 90 are positioned such that they separate the calcaneus 1, talus 2, cuboid 3, scaphoid 4, cuneiformes 1-3, and metatarsals 1-5. The following groove 31 and following ridge 32 are also provided. Figure 1 The lines at the tarsometatarsal joint 12 and the transverse tarsal joint 13 of the foot. However, it does not necessarily mean that they are set at all the lines between all bones and at all joints. Figure 11 yes Figure 10 The side view of the core material 90 shown.
[0086] Because of the following groove 31 and following ridge 32, the adjacent ridges do not become integrated with each other, but rather sink or rebound locally in response to the movement of each bone. Therefore, the core material 90 does not cause excessive concentration of support pressure in a specific area, but ensures the following of flexion and torsion of the tarsometatarsal joint 12 and the transverse tarsal joint 13, achieving a flexible structure that does not hinder the natural movement of the foot.
[0087] Regarding the following grooves 31 and following protrusions 32 designed on the upper or lower surface of the core material 90 to improve the following performance of the core material 90 to the feet, especially the following grooves 31, if this is the only solution, it may easily lead to a decrease in the strength of the core material 90 itself. As a countermeasure, by means of... Figure 12As shown, at least one pair of reinforcing grooves 33 are formed on the lower surface of the core material 90, complicating the cross-sectional structure of the core 90 and thereby improving its strength. In other words, because the core material 90 is curved rather than flat, as shown, the load it experiences during use will not be concentrated at a single point; instead, the stress will spread and be distributed throughout the curved surface. Therefore, by forming concave reinforcing grooves 33 and intentionally setting the local stiffness of the core material 90 to be low, stress concentration in the core material 90 can be mitigated and dispersed, preventing overall damage, deformation, and functional failure of the core material 90.
[0088] The reinforcing groove 33 is formed from the viewpoint of supplementing the strength of the core material 90, so it is fine to form it regardless of the location of the bone or joint.
[0089] When the following groove 31 is formed on the upper surface of the core material 90, the reinforcing groove 33 can be formed on the upper surface, or on the lower surface or both, provided that it does not intersect with the following groove 31.
[0090] When the following groove 31 is formed on the lower surface of the core material 90, the reinforcing groove 33 can be formed on the lower surface, or on the upper surface or both, provided that it does not intersect with the following groove 31.
[0091] Figure 8 The diagram depicts the core material 90 superimposed on the bone structure of the foot 91 using thick dashed lines. As described above, the bones of the foot 91 include the calcaneus 1, talus 2, cuboid 3, scaphoid 4, cuneiform bones 1-3, metatarsals 1-5, proximal phalanges 1-5, middle phalanges 2-5, distal phalanges 1-5, proximal phalanges of the big toe 10, and distal phalanges of the big toe 11. Correspondingly, the core material 90 has a calcaneal support portion 14, a talus support portion 15, a cuboid support portion 16, a scaphoid support portion 17, a third cuneiform support portion 18, a first cuneiform support portion 19, a second cuneiform support portion 20, a first metatarsal support portion 21, a second metatarsal support portion 22, a third metatarsal support portion 23, a fourth metatarsal support portion 24, and a fifth metatarsal support portion 25.
[0092] The core material of the third embodiment of this utility model is a core material intended for the correction of flat feet.
[0093] If the foot is flat, it is known that the medial longitudinal arch will lower, and the navicular bone 4 and cuneiform bone 5 will sink, resulting in overall medial pronation of the foot. To address this, the core material 90 of this invention... Figure 8 The scaphoid support 17 and the 1st, 2nd, and 3rd cuneiform support 19, 20, and 18 shown are individually designed as raised structures and are given a suitable correction coefficient α, which optimizes the support of the scaphoid 4 and its surroundings without hindering the deformation absorption of soft tissue.
[0094] This can inhibit the subsidence of navicular bone 4, promote the reconstruction of the medial arch of the foot, and can also reduce muscle fatigue and improve postural stability caused by flat feet.
[0095] The core material of the fourth embodiment of this utility model is a core material intended for the correction of overpronation.
[0096] In excessive pronation, the talus 2 tends to internally rotate, and the scaphoid 4 and the first cuneiform 5 tilt medially, causing the subtalar joint to deviate from its normal trajectory.
[0097] Therefore, in the core material of the fourth embodiment, in Figure 8 The talus support portion 15 shown has a relatively high ridge, and a shallow following groove is formed between the talus support portion 15 and the scaphoid support portion 17. This not only suppresses excessive internal rotation of the talus 2 but also stabilizes the scaphoid 4. Furthermore, by setting a correction coefficient α suitable for the talus support portion 15, a slightly higher support surface is achieved.
[0098] This allows for the correction of the talus 2 orbital path, control of excessive internal rotation of the foot, and reduction of medial knee load and lumbar balance disturbance during walking.
[0099] The core material of the fifth embodiment of this utility model is a core material used to correct the overall arrangement of the foot for the purpose of correcting the transverse arch caused by the protrusion of the dice bone 3.
[0100] The third cuboid bone is the lateral fulcrum of the transverse arch of the foot, and it greatly contributes to the stability of the midfoot.
[0101] In the core material of the fifth embodiment, in Figure 8 The cuboid support portion 16 shown forms a raised section with a prominent shape. This raised section has a profile that slopes gently downwards toward the front of the foot. Through this structure, the cuboid 3 is properly elevated, thus forming a fulcrum for the scaphoid 4 and cuneiform 5 groups, and the forefoot as a whole is stabilized.
[0102] Figures 13-15 This diagram simulates the shape of the upper surface of the core material 90 based on the ideal skeletal arrangement of the tarsal bones (calcaneus 1, talus 2, cuboid 3, scaphoid 4, and cuneiform bones 1-3, totaling 7 bones) and the soft tissues (muscle, fat layer, etc.) directly beneath them. This line is generally 5-10 mm lower than the bone. Thus, the core material 90 is adjusted to not directly irritate the bone, preventing pressure or discomfort for the wearer. Figure 13The upper surface of the core material, shown by the solid line, is set based on the difference from the ideal bone height, taking into account the deformation of soft tissue. Specifically, the upper surface of the core material is formed based on the above-mentioned correction formula (1) to ensure approximately 40% tarsal correction gap. This core material shape simultaneously achieves skeletal induction and load distribution during walking.
[0103] exist Figure 13 In the lines on the upper surface of the core material shown, a clear corrective ridge is formed below the cuboid bone. This corrective ridge acts as a fulcrum, stabilizing the height alignment of other tarsal bones (especially cuneiform 5 and scaphoid 4).
[0104] In known insoles, the cuboid bone 3 sometimes sinks, causing the load on the outer side of the foot to become distorted. However, the core material of this invention is a structure that actively corrects for this.
[0105] Figure 14 The cross-sectional shape is shown when the tarsal correction gap is 0%, i.e., when no tarsal correction gap is formed.
[0106] Figure 15 The cross-sectional shape of the core material is shown, which makes the portions corresponding to the cuboid, third cuneiform, and scaphoid bones protrude.
[0107] The original method of using the insole core material of this utility model is as described above, by embedding it into the insole or the like to integrate it with the insole. However, it is also possible to use it in other ways.
[0108] For example, the core material of this invention can be disposed between the lower surface of the insole placed in the shoe and the inner surface of the bottom of the shoe on which the insole is disposed. Alternatively, depending on the situation, the core material of this invention can be disposed on the upper surface of the insole by means of adhesion or other methods. Furthermore, in shoes without an insole, only the core material of this invention can be disposed on the inner surface of the bottom of the shoe. In this case, an insole is not used.
[0109] In any case, anti-slip components can be placed in the core material to prevent the core material from moving relative to the inner surface of the shoe bottom and the upper surface of the insole. Figure 16 and Figure 17 An example of a core material 90 with such anti-slip components is shown. In the illustrated example, sheet-like toe-side anti-slip components 35 and heel-side anti-slip components 36 are attached to the lower surface of the core material 90. The toe-side anti-slip components 35 help prevent the core material 90 from sliding primarily along the length of the wearer's foot relative to the inner surface of the shoe sole and the upper surface of the insole. The heel-side anti-slip components 36 help prevent the core material 90 from sliding primarily along the width of the wearer's foot relative to the inner surface of the shoe sole and the upper surface of the insole.
[0110] The anti-slip components 35 and 36 can be formed of a suitable material with a higher coefficient of friction relative to the inner surface of the shoe sole than that of the core material 90. The same applies when the core material 90 is disposed on the upper surface of the insole.
[0111] The shapes of the anti-slip components 35 and 36 are arbitrary, as long as they achieve the anti-slip effect described above. For example, in the illustrated example, the slender rectangular strip-shaped toe-side anti-slip component 35 is attached to the core material 90 with its length direction aligned with the width direction of the wearer's foot. This effectively prevents slippage along the length of the foot. Additionally, in the illustrated example, a circular anti-slip component 36 is attached to the core material 90 as the heel-side anti-slip component 36. This prevents slippage of the heel portion of the core material 90 along both the length and width directions of the foot.
[0112] The toe-side anti-slip component 35 can also be configured such that multiple rectangular strip-shaped components shorter than those shown in the figure are arranged with a distance between them in the width direction of the wearer's foot.
[0113] The heel side anti-slip component 36 can also be like Figure 16 It is formed into a slender rectangular strip as shown by the imaginary line. In this case, by attaching the heel-side anti-slip member 36 to the core material 90 with its length direction aligned with the length direction of the foot, as shown, the heel-side portion of the core material 90 can be effectively prevented from sliding in the width direction of the foot.
Claims
1. A shoe insole core material for supporting the foot, characterized in that, On the upper surface of the core material, there are multiple tarsal support portions corresponding to the position and height of multiple tarsal bones, which are composed of three-dimensional ridges for correctively supporting the bone arrangement of the foot.
2. The insole core material according to claim 1, characterized in that, The core material has following grooves or following ridges on its upper surface, lower surface, or both surfaces to follow the movement between the tarsal support parts.
3. The insole core material according to claim 1, characterized in that, The core material has one or more reinforcing grooves on its lower, upper, or both surfaces to adjust the balance between the overall rigidity and buckling of the core material.
4. The insole core material according to claim 2, characterized in that, On the lower surface, upper surface, or both of the core material, there is one or more reinforcing grooves that do not intersect with the following grooves or following ribs, for adjusting the balance of the overall rigidity and buckling of the core material.
5. The insole core material according to claim 1, characterized in that, At the position corresponding to the lower part of the cuboid bone, there is a prominent structure that functions as a correction fulcrum.
6. The insole core material according to claim 1, characterized in that, The height of the supporting surface corresponding to each tarsal bone is quantitatively set by the following correction formula (1): T(i)={Hbone(i)-Hsoft(i)}×(1-α)····(1) Here, T(i) is the set height of the upper surface of the core material, Hbone(i) is the reference height of the bone, Hsoft(i) is the thickness of the soft tissue including at least one of the muscle, tendon, and fat layer, and α is the correction coefficient.
7. The insole core material according to claim 6, characterized in that, The correction factor α is a value in the range of 0.3 to 0.
5.
8. The insole core material according to claim 1, characterized in that, Each bone support component is set into a smooth, continuous three-dimensional shape based on foot shape scan data and foot pressure distribution data, and using NURBS surfaces.
9. The insole core material according to claim 1, characterized in that, The insole core extends to the base of the metatarsal bones, providing overall foot support without compromising the mobility of the tarsometatarsal and transverse tarsal joints.
10. An insole, characterized in that, The insole core material has multiple tarsal support portions on its upper surface corresponding to the position and height of multiple tarsal bones, which are formed by three-dimensional ridges for correctively supporting the skeletal alignment of the foot.
11. A type of footwear, characterized in that, The insole core material is provided, and the insole core material has multiple tarsal support portions on its upper surface corresponding to the position and height of multiple tarsal bones. These support portions are formed by three-dimensional ridges that provide corrective support for the skeletal alignment of the foot.
12. A type of footwear, characterized in that, An insole containing an insole core material is placed thereon, the insole core material having multiple tarsal support portions on its upper surface corresponding to the position and height of multiple tarsal bones, which are formed by three-dimensional ridges for correctively supporting the skeletal alignment of the foot.