ES2602093T3 - Individually shaped footwear - Google Patents

Abstract

Insole for a shoe or other footwear, said insole comprising: - At least one first layer extending from below the heel to an area of the toes; and - A second layer made of thermoplastic material, whose material is chosen from a group consisting of: ABS, PVC, A-PET and PETG, in which said material becomes essentially plastic above 45 ° C and below 95 ° C, said second layer extending from below the heel only to the metatarsophalangeal joint of the foot.

Description

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DESCRIPTION

Individually shaped footwear FIELD OF THE INVENTION

[0001] The present invention relates generally to footwear. In particular, the invention relates to shoes and custom insoles.

BACKGROUND OF THE INVENTION

[0002] Approximately 70% of the world's population suffers from some type of foot problems. Only a few of the total number have had the opportunity to acquire templates that alleviate at least part of the problems. Traditionally, custom insoles and shoes have been manufactured by shoemakers, physiotherapists, or professional podiatrists. Until now, the associated acquisition process has been rather slow and expensive; A person willing to spend 120 to 250 euros on custom-made insoles or more than 300 euros on custom-made shoes has to visit one of the aforementioned professionals or their distant associate to obtain their foot measurement characteristics, including, For example, standing size and other properties, also advantageously causing problems, after which the order is placed on a waiting list for the actual manufacturing process to be initiated by the professional. Often, the time elapsed between placing the order and receiving custom shoes / insoles extends for a few days or even weeks, which makes the overall process quite uncomfortable, especially from the point of view of an occasional customer. Foot / gait problems affect soles, ankles, knees, hips, back, etc .; That is why its treatment and prevention is particularly beneficial for complete human well-being. An individual takes about 15,000 to 16,000 steps each day. The load on the feet in sports is many times the weight of the body. For example, the force of the load is approximately three times your body weight while running and 7.5 times while playing basketball due to jumps and other irregular movements. Whenever the position of the foot is correct, the load is evenly divided between the upper joints.

[0003] A common condition called pronation refers to an inward (ie, medial) turn of the foot (especially heel and bridge) that becomes over-pronation when the foot turns too much. On the contrary, over-supination is caused by turning in too small. Both conditions easily cause pain, wear and even stress injuries to the feet and the various joints of the body. Different support templates (bridge) are available to correct the position of the feet. They have been designed to support the longitudinal and lateral medial bridge but without cribs glued separately they don't really correct the position of the foot. The placement of cribs is a slow and expensive process. The result obtained depends on the person who performs the task and still tends to be quite inaccurate. As an additional drawback, after gluing the cribs into the templates, a new mold cannot be given without first removing the cribs.

[0004] Prefabricated insoles for templates do not provide a perfect match with any foot, since people generally have no identical foot shape. Consequently, many support templates are ultimately considered inconvenient due to their poor adjustment.

[0005] JP H10 99 103 A, discloses a template, comprising a first layer extending from under the heel to an area of the toes, and a second layer made of thermoplastic material, which can be made plastic when It heats up.

SUMMARY OF THE INVENTION

[0006] In order to alleviate the aforementioned problems, the present invention provides, in one aspect, a insole for a shoe, the insole of which includes the features of claims 1.

[0007] In another aspect a shoe comprises the features of claim 7.

[0008] A insole or a shoe that is going to undergo a process of conformation (or in reality reconformation since it intrinsically has some type of basic form after being manufactured) of the invention to correct the position of the foot will be referred to hereinafter A preform

[0009] In a further aspect a process for manufacturing an individually shaped template includes:

- choose one or more, for example, a pair of template preforms from a selection of preforms having a thermoplastic layer,

- heating the chosen preform above the glass transition temperature (Tg) of the thermoplastic layer in case the preform lacks preheating,

- guide a client to step on the hot preform,

- adjust the angle of the ankle to the correct position with the help and guidance of an orthopedic or other qualified person,

- adjust the client's foot so that the plantar arch fits into a normal high position, and

- wait for the temperature of the heated template preform to fall below the glass transition temperature of the thermoplastic material.

[0010] Still, in a further aspect a process for manufacturing an individually shaped shoe includes the following steps:

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- choose one or more, for example, a pair of shoe preforms from a selection of shoe preforms,

- heating the chosen shoe preform above the glass transition temperature of the thermoplastic material layer of the shoe preform in case said preform lacks preheating,

- guide the client to step on the heated shoe preform,

- adjust the client's foot so that the plantar arch fits into a normal high position,

- adjust the angle of the ankle to the correct position with the help and guidance of an orthopedic or other qualified person,

- remove the shoe preform from the foot, and

- wait for the temperature of the shoe preform to fall below the glass transition temperature of the thermoplastic material.

[0011] Still in a further aspect a procedure for providing a customer with individually shaped footwear comprises:

- provide a point of sale that includes a plurality of alternative items selected from the group consisting of: a insole, a lining for a shoe, and a shoe; additionally including said point of sale means for adapting to the client's foot an article belonging to said plurality of articles at the client's foot,

- study a client's foot in order to allow the choice of an article belonging to said plurality of articles,

- try, preferably to heat, through said means to customize, at least part of the article chosen to give it its shape in response to an external force introduced immediately afterwards,

- placing the client's foot in contact with the article treated in accordance with its predetermined use, and

- Manually shape the treated article in order to correct the position of the foot adapting to it.

[0012] The utility of the invention arises from a number of issues. First, the individually shaped shoe or insole provides natural arch support and distributes the ground reaction force more evenly across the foot, knee, hip and back. Secondly, the over-pronation or over-supination is reduced and the gear is aligned again. This positively affects body posture and relieves fatigue, sprained ankles, chafing and pain. The invention also stabilizes the foot, adds lateral support of the foot and reinforces it to reduce the loss in muscle power. In addition, the transverse arc is supported when the thermoplastic layer extends beneath it.

[0013] In addition, when considering the issue from a commercial perspective, shoes / insoles can be offered through retail stores, for example, shoe or sports stores, and the customization process required by a qualified sales employee It only takes a few minutes. The point of sale only consumes a smaller space (a few square meters) and mandatory investments in equipment can be kept low. The provision of custom-made templates carves the favorable image that emanates from the retailer and offers promotional value also in relation to other products; attracting the public to visit the store and raising the sales figures of related products (shoes / insoles, socks, etc.), respectively. The profit margin can be kept high, while the sale price is still considerably lower than with its prior art precedents.

BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In the following, the invention will be described in greater detail with reference to the attached drawings, in which: Figure 1 is a schematic of two forms of sole construction.

Figure 2 is a flow chart depicting an example of a procedure in which an individually shaped shoe is provided to the customer.

Figure 3 is a more specific flow chart on relevant analysis stages to determine the needs of a customer.

Figure 4 represents a podoscope that includes a transparent glass plate on which the client remains during the foot analysis.

Figure 5 additionally displays the chosen procedural steps of Figure 2.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

[0015] A template preform (~ cut) has at least one layer, which is made of thermoplastic material and extends at least from below the heel below the plantar arch of the foot of the target person, hereinafter, the client . Advantageously, two or three layers of material are used that are joined together in the template preform for customer convenience. The top layer (if used) of the preform insole is placed in front of the foot and the bottom layer is placed against the shoe. The materials of these two layers can be selected from any material used for prior art templates. For example, the bottom layer may be constructed from a known material such as Rheluflex (trademark of Rhenoflex GmbH Ltd) comprising nonwoven polyester as a carrier, a mixture of ionomer-ethyl vinyl acetate acetate as an extruded core, and as an adhesive EVA-thermo-adhesive.

[0016] The intermediate layer of the template (in case of three layers) is made of thermoplastic material. The thermoplastic material used is selected from the group of known thermoplastics mentioned in claim 1. The critical value is the temperature, called the glass transition temperature, for which the thermoplastic material becomes plastic and, on the other hand, returns to form. solid when the temperature drops after

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the conformation of the template. This temperature should not generally be so high that the template against the client's foot is perceived as uncomfortable.

Despite a high glass transition temperature, a thermoplastic material is still applicable if it can be cooled sufficiently before contacting it with the foot on condition that the thermoplastic material remains in a plastic state, that is, moldable. The suitable temperature to become plastic this thermoplastic material is somewhat below 95 ° C and above 45 ° C. Advantageously, the range is from 50 ° C to 85 ° C. Suitable materials that become or are plastic within the preferred ranges according to the invention are thermoplastic polyester A-PET (amorphous polyester terephthalate) and PETG (glycol modified polyethylene terephthalate, which is a copolyester). ABS (acrylonitrile butadiene styrene), PVC (polyvinyl chloride) can also be used.

[0017] The thickness of the thermoplastic layer is preferably selected in order to provide reasonable support for the client's foot when the layer is in a rigid state. The thickness may also vary along the layer, for example if more flexibility is desired below the area of the fingers (thinner) than the area of the plantar arch (thicker). Another characteristic required for the thermoplastic material dictates that it must be rigid below the melting temperature.

[0018] With reference to an embodiment shown in the upper sketch 102 of Figure 1 and which is not part of the invention, the intermediate layer 104 (or single layer) made of thermoplastic material can laterally cover the entire surface of the template. In an alternative embodiment, see sketch 110, layer 112 laterally covers only a part of the template. In that option it is necessary that the thermoplastic material extends longitudinally at least below the heel to below the plantar arch and in the lateral direction, advantageously, almost the entire width of the template.

[0019] According to the invention, the thermoplastic layer has been designed in order to extend from under the heel to the metatarsophalangeal joint of the foot, so that the transverse arch can be supported. In addition, a pre-cut pad can be placed under the transverse arch when the template is shaped to raise the transverse arch in the optimal position. However, it is advantageous to maintain a margin on the edge of the insole without hard thermoplastic material in case there is a need for small adjustments when the insole is placed in the shoe. In addition, the toe area of the template must remain without the hard thermoplastic to allow natural movement of the foot when walking or running.

[0020] One aspect refers to the manufacture of a preform of a template that is arranged in one piece (therefore, possibly having separate layers that are joined together with adhesive or the like) and that is easy to heat over of the glass transition temperature of the thermoplastic material included. After cooling the template is preferably a rigid one-piece structure that corrects the position of the feet and supporting the foot, especially the plantar arch and the transverse arch thereof. The plantar arch can be adjusted in a correct elevated position by raising the client's toe and / or raising his heel while holding the toes against a support surface (Windlass effect). Adjustments can be made on a soft pad, with or without additional manual guidance. On the other hand, a qualified person can achieve a good result with only manually without a support surface.

Alternatively, according to the present invention, a shoe can be provided, said shoe having a sole, which can be shaped according to the client's foot for correcting the incorrect position thereof. The footwear in this case will have at least one layer of thermoplastic material. The shoe is advantageously manufactured to include all the necessary layers and is simply customized after purchase. Suitable shoes include, for example, various types of walking shoes, sports shoes, boots, sandals and light gym shoes. The sole is advantageously at least of a two-piece structure that includes a thermoplastic layer well placed on top of the sole material or which is integrated, for example embedded within it. The one or more unique layers with exclusion of the thermoplastic layer may comprise, for example EVA (ethyl vinyl acetate) or other prior art materials; eg, the above-mentioned EVA is available even in different hardnesses. If there is more than one layer, the thermoplastic layer may be smaller in the lateral direction of the entire plant. It is essential that the thermoplastic layer extends from under the heel to the metatarsophalangeal joint of the foot in the same way as the insole. Thermoplastic materials are selected in the same way as for the template. It may be advantageous to make at least the outer surface of the sole of a material that has good friction characteristics and wear resistance. Optionally, for example, viscoelastic foam or other material can be used, which can also be thermally sensitive, inside the shoe, whereby the internal parts of the shoe are also remodeled in addition to the mere insole and provide additional comfort / support. With this embodiment, a very comfortable custom shoe that firmly supports the bone structure of the feet and ankles can be secured. This is very important if the client has one, for example, diabetes or rheumatism and the shoe should not produce any friction or abnormal pressure on the foot.

[0021] In another alternative, footwear such as shoes (marching, sports, specific discipline, etc.), skates, ski boots, etc., can be offered with pre-installed insoles according to the invention, whose insoles They will then be customized before use. The layers inside the shoe that receive the insole of the invention will advantageously fit the insole shapes. Optionally, for example, viscoelastic foam or other material that is optionally thermally sensitive can be used inside the shoe, whereby the internal parts of the shoe are also remodeled in addition to the insole itself.

[0022] Figure 2 shows a flowchart, by way of example only, of the procedure for providing a retailer individually formed templates for a customer. Templates can be provided as such.

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or with shoes that by default may eventually include the insoles of the invention Similarly, shoes can be offered, including a moldable insole of the invention through the procedure presented below. Some of the steps of the procedure and associated devices are also clearly visualized in Figures 3 to 5.

[0023] The concept makes it possible to complete custom templates in just a few minutes after receiving the order. The templates of the invention can be provided to retailers as part of a complete service package that includes a point of sale, equipment for the study of the feet, and equipment for the manufacture of custom templates. The service package can also include the training of sales staff through an educational program that can be a (intensive) or lesson-based course.

[0024] In step 202, a procedure starts, a point of sale 218 is prepared for use in retail stores. The point of sale can be advantageously delivered as a predetermined set comprising various separate elements that have a recommended location within the point so that the aggregate point can thus be conveniently located in a preferred location, or alternatively, the retailer can construct , at least partially, according to your personal preferences separate elements if it is considered useful. The point includes the means necessary to quickly provide a client with properly configured templates. Such means may include a support or a frame with several template preforms (preferably lightly packaged, with space-saving and at least partially transparent boxes, made of, for example, cardboard) with different properties (size, thickness, basic design, etc.). ), a molding stand with one or more mold pads, a heating system, see number 504 of Figure 5, such as a furnace for heating the template preforms, and basically optional study means for the analysis of the client's feet and problems / properties thereof, in addition to the mere eye inspection that will be carried out by qualified personnel anyway.

[0025] The means of study may include, for example, a podoscope, a camera system and a computer. The podoscope is, by definition, a device for analyzing the interaction of the foot and a support surface. A client stands on a transparent glass plate of the podoscope, see reference number 404 of scheme 402 in Figure 4, so that an image of his feet is shown through a mirror to the person who performs the measurements, see diagram below 410. The study media, eg, the above mentioned pedoscope, may also include data acquisition means such as an optical scanner, a camera, or some other suitable apparatus for forming optical images and / or electrically of the client's feet and posture (errors), see number 406. This image technology allows the storage of customer-dependent data in the retailer for future use and archiving purposes.

[0026] The image formation technology can be connected to a printer and / or a computer, see number 502 of Figure 5, which is configured to display different views, for example, feet with optional zoom feet, silhouettes, etc., on a screen from the collected data. The qualified sales clerk can then point out to the customer, through the image displayed, the problems encountered in his foot posture and explain how the situation can really be improved by custom made templates according to the invention. The computer can also be configured to store the data, preferably specifically from the client. Correspondingly printed images can be stored. In addition, both the computer can include its own data transfer interface, for example a network interface, or a separate data transfer interface can be coupled to it, or directly to the data acquisition means to transfer the acquired data. to external destinations, such as the central server of the retail chain or third-party databases, if the client allows it.

[0027] Still, the start-up phase includes the education 220 of the sales employees and other personnel on the sales processes and customization of the templates of the invention. Preferably, the professionals authorized to manufacture the workforce should take care of the training. It is beneficial for the result that the staff knows how to use the different template designs, the oven, the means of study, the molding stand. Undoubtedly, a responsibility for different devices can also be divided between several people, that is, one person can take care of the foot analysis while another really shapes the template with an appropriate shape. Only qualified professionals in stores can be authorized to carry a brand tag associated with the templates. The educational program may include regular follow-ups that may be correspondingly made mandatory for continued qualification and the right to carry the brand tag.

[0028] Returning to the runtime flow of the invention, step 204 refers to a specific customer analysis phase during which a qualified sales employee initially studies customer needs, whether by manual / eye research of the feet or by explanation of the client, preferably doing both.

[0029] The analysis of step 204 is further illustrated in Figure 3 to successively adjust different aspects included therein; In the first place 304, a suitable basic design or "style" of the template can be determined, through the use analysis 302, from multiple options, such as men's / women's, sports (general and, optionally, discipline). purpose such as tennis, race, soccer, football, basketball, hockey, skating, skiing, hiking, etc.), health, military, medical and basic design, affecting the design then for example, shape, material, thickness, elasticity, etc. of the preform. Information for analysis and decision making (302 desired use / purpose of, for example, templates) can be obtained directly from the client by inquiring and monitoring their needs. The customer may have brought a pair of shoes to use with the insoles, for example, which facilitates the selection of an appropriate preform design and size.

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[0030] In addition to the mere selection of the basic design that depends largely on the desired use, the most accurate data on the client's feet and their posture (over-pronation, over-supination, etc.), can be collected in 306 and reviewed by means of, for example, visual inspection and means of study such as the podoscope explained above. A foot size is, of course, a typical parameter / criterion, necessary for the determination, 308, of a suitable template preform, although an oversized preform may be in some applications properly cut to a smaller size. The customer can tell the employee directly the size, but the size can also be checked on site by using available measuring equipment. On the other hand, special conditions 310 such as hallux valgus, flatfoot, cavus, rheumatism, diabetes or pregnancy may imply a need for special preforms that are advantageously in the retailer's stock as well. On rare occasions they can still be presented when a responsible sales employee realizes that the client's feet and / or the indicated use of the templates require a more thorough investigation and an adequate template cannot be approached reliably from the information acquired, or that the necessary preforms are not simply available. The sales clerk can then refer the client, 312, to a specialized clinic that employs foot specialists, for example, physiotherapists or podiatrists, with deeper knowledge. Alternatively, the employee can himself with the consultation clinic specialists and optionally order special preforms for the client, if possible. A more detailed examination will be carried out in the clinic; for example, neuromuscular tests, joint circulation and soft tissue palpation and movement tests can be performed. The biomechanics of the lower extremities and the spine can be evaluated by recording the standing position of the client, walking and running. Radiographs, bone scans, CT, MR, or ultrasound may also be available. In this way, through the cooperation between the clinic and retail stores that offer the templates of the client, you can receive fully guaranteed service, so that the basic cases can be resolved at the point in the retail premises while the most exhaustive study will take out in the clinic.

[0031] Instead of communicating verbally with the client from scratch, for example, a computer with custom software can be provided to question the client about the properties of the feet and the fate of the insoles, which in turn forms at least semi-automatically, a client profile from a predetermined set of profile rules. Alternatively, the customer can have their preferences already stored in the store due to an existing customer history, in which case the analysis stage can be basically omitted, providing your personal data and the future use of the new templates will remain substantially unchanged. .

[0032] Anyway, the software or the sales clerk optionally assisted by the software, can recommend a suitable template design for the customer based on the available information, and then a corresponding template preform will be collected, preferably from the next tray where are the preforms (or packages, each comprising one or two preforms) in sight, conveniently grouped based on the sizes / designs thereof. To the extent that human feet are never practically the same size or shape, preforms may have been packaged separately instead of traditional pairs. Alternatively, if the customer already knows his needs without motivation to re-analyze the case, he can recover the appropriate preforms, by himself and then consult the seller for the rest of the customization procedure.

[0033] In step 206, a suitable pair of preforms has already been determined and they are heated to a temperature that allows reconfiguration of at least predefined portions thereof in response to a physical force introduced thereon. The material selections for the preforms as explained above guarantee a softening temperature of the predetermined portions that is still tolerable to the customer, for example, 850C. After heating the preform to a fairly high temperature as said 850C, from the customer's point of view, it is preferable to wait for the temperature to drop to a more convenient value such as 70 to 750C. Alternatively, the customer can use a corresponding sock or protection to isolate the foot from intense heat. The heating device is advantageously selected and configured so that the heating time is preferably only a few minutes or less in order to provide the customer with a fast service.

[0034] In step 208, the heated preforms are preferably placed on a flexible material such as a mold pad (for example, a pillow / cushion) of a molding stand, for example, and the customer receiving instructions to apply force to through its plants to the surfaces of the preform, meanwhile, the clerk guides the client's feet to a suitable position and manually, forming, by physical interaction, for example, through the fingers, the templates to adjust at the feet and achieve an improved mold according to the principles of the invention, see step 210 of Figure 2 and number 506 in Figure 5. The conformation may refer to introducing protrusions in a desired direction of the original template formed / flat, for example. In addition, the client can stand on the preforms to apply the necessary pressure corresponding to the actual weight bearing posture. Advantageously, the molding stand includes a lower portion to receive one or more molding pads with the client's feet on top of them, and an upper portion, such as a crossbar on which the client can lean support during the process of molding

[0035] In step 212, the clerk checks whether each template adapts to the respective foot (floor) of the client and provides an improved foot position and body posture, as referred to in Nos. 508 and 510 of Figure 5. In case some adjustments still have to be made, the procedure can be redirected to a suitable preceding stage, such as step 206, 208, or 210. Otherwise, the individually formed templates are

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they attach to the client's shoe, which may require slight additional adjustments such as cutting edge areas, etc., 224.

[0036] The execution of the procedure is finished in step 216. It is expected until the temperature of the templates falls below the glass transition temperature of the thermoplastic material after which the templates can be used. In the event that the retailer in question is willing to maintain customer records or transmit such information to a centralized registry, possibly maintained by the retail chain, the template manufacturer or some other third party, the data of Customers can be stored 226 to facilitate future transactions with the same customer. This preferably occurs only after receiving an explicit acceptance from the customer to store personal information. Step 226 may also include providing template maintenance instructions to the customer.

[0037] As an additional service, the dependents may be advised to channel the interest of the client in the templates of the invention, even if the client is initially limited to new shoes only 222. This can happen either unconditionally or even notice a problem in the foot that the custom template could alleviate.

[0038] The retail store can also offer a product warranty that allows the customer to obtain the reconfigured preforms reconfigured by the retailer at no additional cost or with only a basic service fee, if the need arises.

[0039] Although the above procedure has been described from the point of view of a pair of templates that are individually shaped for the customer, which remains the preferred scenario, it is also feasible to provide a single template (or a single shoe).

[0040] In the present invention also a lining or other element / layer to be placed in a shoe and, possibly provided with a shoe or other footwear, can be considered as the template of the invention that has similar effects and general applicability.

[0041] Similarly, a shoe of the invention can be offered in the spirit of the above procedure. Especially a shoe sole or a part thereof can be constructed following the ideas presented above with reference to a template. For example, the sole of a soft gym shoe, a ballet shoe, a sandal or other type of shoe with sufficiently soft portions suitable for manual molding can be reconstituted after heating.

[0042] It is evident to a skilled person that certain steps of the procedure can also be performed in reverse order, for example, analysis of properties of the feet 306 and an analysis of global use 302 and selection of basic template design 304; both aspects contribute to the selection of a suitable template cut 308.

[0043] Instead of heating, the preforms can be reconformed using some other feature of a built-in thermoplastic material. For example, certain resins can be hardened by using predetermined chemicals. However, in the application what is important is to select materials that allow without problems, but even in real time, reconformation of the preform at the foot of the client, that is, you should not introduce health hazards, for example, burns to the client on or after the reconformation procedure.

[0044] In addition to humans, the invention can also be applied in the manufacture of custom footwear for animals.

Claims (9)

5 10 fifteen twenty 25 30 35 1. Insole for a shoe or other footwear, said insole comprising: - At least one first layer that extends from below the heel to an area of the toes; Y - A second layer made of thermoplastic material, whose material is chosen from a group consisting of: ABS, PVC, A-PET and PETG, in which said material becomes essentially plastic above 450C and below 950C, said second layer extending from under the heel only to the metatarsophalangeal joint of the foot. 2. Template of claims 1 or 2, wherein the first layer is an upper layer facing the foot or a lower layer facing the shoe. 3. Template of claim 2, wherein said lower layer includes at least one material selected from the group consisting of: non-woven polyester, and mixture of ionomera-ethyl vinyl acetate resin. 4. Footwear comprising the template of claim 1. 5. Footwear of claim 4, wherein said footwear is chosen from a group consisting of: a shoe, a skate, and a ski boot. 6. Footwear of claim 4, further comprising a thermally sensitive inner layer. 7. Shoe comprising: - A sole layer facing the floor surface that extends from under the heel to an area of the toes; Y - A second layer made of thermoplastic material, whose material is chosen from a group consisting of: ABS, PVC, A-PET and PETG, so that the selected material becomes plastic essentially above 45 ° C and below 950C, said second layer extending from under the heel only to the metatarsal-phalangeal joint of the foot and said second layer being located at the top of the single layer or being integrated into the sole layer. 8. Shoe of claim 7, wherein the sole also comprises upper layer facing the foot. 9. Shoe of claim 7, further comprising an inner layer of viscoelastic foam.