CZ305699B6 - Multipurpose footwear for diabetics with optimized structure - Google Patents

Abstract

In the present invention, there is disclosed a multipurpose footwear for diabetics with optimized structure suitable as walking shoes, ceremonial shoes as well as sports footwear, wherein the footwear of the present invention is provided with a sole section (4) that is glued onto an upper (1). The derby upper (1) has a lowered derby with a closure able to compensate optional light deformations of a foot sole, and reinforcing upper parts, particularly heel and toe case are made of elastic thermoplastic materials with plastic memory. Internal outfit of the footwear consists of a sock lining (2) with a lower nonwoven fibrous layer (2.1) and an upper expanded layer (2.2) with open pores and plastic memory, and a loose insole (3) consisting of a lower layer (3.1) a middle layer (3.2), and an upper textile layer (3.3). On the bottom side of said lower layer (3.1), in regions with the largest concentration of the foot sole pressure, particularly in the area below the fingers, in the area below the metatarsal bones, in the area below the middle and rear extreme portion of the foot sole and in the area in front of the heel bone, there are situated shape-set projecting parts of a gel padding (3.4) that can be anchored by pressing in the upper expanded layer (2.2) of the sock lining (2) with plastic memory wherein said middle layer (3.2) is made of damping foam with plastic memory. The glued sole section (4) comprises a middle sole (4.1) made of expanded polyurethane and a contact layer (4.2) made of compact thermoplastic polyurethane.

Description

Multi-purpose footwear for diabetics with optimized construction

Field of technology

The invention relates to multi-purpose footwear for diabetics with an optimized construction, suitable as walking, social and hiking footwear.

Prior art

Footwear for diabetics is in principle designed to be able to prevent the further undesirable development of irreversible changes in the feet of diabetics. The main purpose of these shoes is to protect the diabetic's feet from the possibility of injury and the development of a defect.

As far as the correct anatomical solution is concerned, one of the most fundamental structural elements of footwear is its insole structure. Currently, several different types of insoles are used, the main task of which is to provide the user with the most pleasant and comfortable feeling, the most perfect support and at the same time stop or suppress congenital or acquired foot deformities or gait defects. A large number of these products are also adapted to massage the foot and act on various nerve endings.

Shoe insoles can basically be divided into two main groups of different constructions. First of all, there are insoles comprising a layer of a suitable deformable material, for example cork, which adapts temporarily or permanently to the shape of the user's foot during use. Representatives of this group include, for example, the solution according to German patent specification DE 3406504, where the insole comprises, inter alia, a layer of cork crumb with a soft binder, which adapts to the shape of the lower part of the user's foot during wear. A similar solution is also dealt with, for example, by Japanese patent application JP 2001299408, in which one of the insole layers is made of cork, which, after prolonged use, adapts to the shape of the lower surface of the foot. However, both of these solutions have relatively significant disadvantages, e.g., if the user has an improperly shaped foot, the insole is shaped so as to further aggravate the defect upon further use, instead of improving the user's gait quality.

The second group of insoles includes insoles, on the upper surface of which, which is in contact with the user's foot, a certain relief is created, the shape and arrangement of which more or less corresponds to the shape of the footprint. Such solutions include, for example, the solution according to Japanese Patent JP H 07039402, in which the surface of the insole, which is in contact with the user's foot, is formed by a group of protrusions and holes. However, the disadvantage of these solutions is that such insoles are shaped according to the unified shape of the human foot and thus do not take into account individual shaping, which is manifested mainly in differences in shape and inclination of the toes, so in this case the toes adapt to the construction of the insole. it should be just the opposite.

In addition, the use of insoles of both types described does not ideally distribute the weight of the human body between the thumb joint, the fingertips and the heel bone and relieves the transverse and longitudinal arches, resulting in undue effects on the bloodstream in soft areas of the foot. In addition, the ideal involvement of all the muscles of the lower limbs is not achieved, so that some muscles or shafts of the foot are overloaded, while the capacity of others is not utilized practically at all. The use of hitherto known types of insoles thus leads not only to excessive fatigue, but also to other physical, or even mental, problems, which further deepen with age.

The solution according to the Czech patent CZ 298894, which describes the insole of the shoe, the upper side of which is shaped in relief in the shape of the imprint of the lower part of the human foot and the lower side of which has the shape of the lower part of the human foot with a smooth toe part. The solution according to the Czech utility model CZ-U-16872 is also principally similar, in which a hole in the thumb joint is also created in the insole.

Other special types include padding based on gel-filled parts, see eg solution according to 5 Czech patent application PV 2009-219, consisting in the fact that the sewing insole has an anchored part anchored on the upper surface of its support layer, which has areas with the highest concentration The pressure of the foot, in particular in the area under the toes, the area under the metatarsal bones, the area under the middle and posterior marginal part of the foot and in the area under the heel bone, are shaped depressions. The principle of negatives and positives then includes identically situated and shaped raised parts as well as gel fillings anchored in the lower formable damping layer of the insole.

Improved insole structure solutions often blend with the optimization of the entire shoe design. E.g. The footwear according to International Application WO 9823178 consists of an upper and a lower support part which is connected to said upper, comprising a sole and a wedge heel expediently located on this sole. This is adapted to accommodate an internally arranged insole or an insole with flexible means, e.g. based on a layer of granular material, at least under a part of this internally arranged insole. Said compliant means elastically deform under the weight of the wearer's weight, as a result of which the internally arranged insole deforms in such a way as to permanently assume the specific anatomical shape of the foot of the wearer's foot.

In the solution according to the Czech patent application PV 1991-3921, the inner surface of the shoe bottom, which faces the user's foot, is anatomically shaped and designed as a flexible foot pad. At least one solid layer, for example of wood or solid plastic, is then placed under this substrate. The sole is made of flexible but durable material. The entire bottom of the shoe is curved upwards in the toe area and preferably also in the heel area. The solid layer is then preferably provided with a cut-out in its finger part and / or is bendable.

As already mentioned, another fundamental requirement is an effective solution for the correct passage of water vapor, which is formed inside the footwear, outwards. E.g. U.S. Pat. No. 5,044,096 and European Patent No. 30 EP 0382904 describe a sole made of plastic, which is divided into two layers, between which a breathable and water-impermeable membrane, e.g. of Gore-Tex material, is inserted.

Patent application US 2002/157278 in turn describes a breathable shoe which has an assembly of a breathable upper and a breathable insole connected by a quilted seam. A breathable 35 and waterproof membrane is then attached under the insole. A simple assembly of elastomeric soles with through holes is attached to the upper / insole assembly by gluing or direct injection.

WO 0232246 describes a shoe with a sole, the sole of which is perforated by a plurality of channels in the form of a valve, so that water vapor penetrating downwards through a multilayer midsole 40 arranged over them must first be discharged predominantly horizontally to the narrow passageways.

Footwear optimized in terms of user comfort, suitable for diabetics, especially as work footwear for demanding application environments, is the subject of the Czech published application of the invention45 zu PV 2009-365. The upper of the shoe is provided with padding in the instep part, in the area of the transition into a solid folded tongue, which is critical from the point of view of the dangerous formation of bruises. In the raised toe part it is equipped with a steel toe cap and in the heel part with a plastic thermopath. It has a lining with the joints of individual zig-zag-type parts with a three-pin, which is taped with technical tape and is connected to a sewing insole, to the cork part of which a tread layer of an elastomeric mixture sole is then connected via an intermediate layer of injectable thermoplastic elastomer. The insole structure of the shoe is, in addition to the said sewing insole, further formed by an insole, with the sewing insole having a shaped part anchored on the upper surface of its support layer, which has areas under the toes, especially under the toes, areas under the metatarsal bones in areas with the highest concentration of foot pressure. , in the area below the middle and back edge of the foot and in the area under the heel bone, shaped depressions are situated, into which the principle of negative-positive fits identically situated and shaped raised parts of the gel filling anchored in the lower formable cushioning layer of the multilayer insole.

Although the footwear described above is optimized in terms of construction for use by diabetics, on the other hand, it is a footwear designed primarily for work, which is not suitable for multi-purpose use, such as walking, social and hiking footwear.

The essence of the invention

The multi-purpose footwear for diabetics with an optimized construction according to the invention, suitable as walking, social and hiking footwear, with a sole part glued to the upper, contributes to the elimination of the above-mentioned drawbacks. The essence of the present invention lies in a new embodiment of footwear for diabetics characterized by a combination of the following design features:

• the derb upper of the shoe has a reduced derb with a closure capable of compensating for possible slight deformities of the foot, • stiffening upper parts, especially the heel and toe, are made of flexible thermoplastic materials 20 with shape memory, • the inner equipment of the shoe consists of a sewing insole and an upper foam layer with open pores and shape memory, and an insole composed of a lower layer which has on its underside in areas with the highest concentration of foot pressure, in particular in the area under the toes, areas under the metatarsal bones, areas under the middle and the back edge of the foot and in the area under the heel bone, the raised raised parts of the gel filling are situated, • the raised parts of the gel filling are anchored by pressing in the upper foam layer of the shape memory stitching insole, • the insole further comprises a middle layer based on cushioning foam with shape memory and upper textile layer, · glued sole part contains midsole based on lightweight polyurethane and a tread layer based on compact thermoplastic polyurethane.

The suture insole preferably has an upper open shape polyurethane foam based on shape memory attached to the upper surface of the lower nonwoven fibrous layer. In this lightweight layer, the raised inserts of the insole insole, which are made of compact polyurethane with the ability to compensate for the loss of tissue on the foot, are pressed by anchoring to reduce the risk of skin cracking and ulcers.

The insole comprises a bottom layer and a middle layer based on cushioning materials with open 45 pores, these layers preferably being connected in points to ventilate the air around the foot.

The bottom layer of the insole is preferably made of a permanently flexible polymeric material, in particular open-cell polyurethane, without permanent deformation under load.

The middle layer of the insole is preferably made of shaped polymeric foam, in particular based on open-pore polyurethane with the ability to adapt to the original shape of the user's foot, including possible deformities or even minor amputations.

-3GB 305699 B6

The midsole of the sole can advantageously be made of a lightweight polymeric material, in particular polyurethane with the ability to absorb shocks when walking. The tread layer of the sole part preferably has an overlap of 3 to 4 mm to increase the walking stability of the uppers and is made of a polymeric material, in particular a compact polyurethane, and is provided with a finely chopped pattern with anti-slip properties.

Explanation of drawings

To further elucidate the essence of the present invention, the accompanying drawings serve, in which Fig. 1 shows the composition and design of individual parts of footwear for diabetics according to the present invention, Fig. 2 the external appearance of footwear according to the invention, in the form men's footwear, and Fig. according to the invention, in an embodiment women's shoes.

Examples of embodiments of the invention

The multi-purpose footwear for diabetics with an optimized construction in the exemplary embodiment according to FIG. 1 has a derb upper 1 with a reduced derb and a closure capable of compensating for possible slight deformities of the foot. The reinforcing upper lengths, especially the heel and the toe, are made of flexible shape memory thermoplastic materials. In terms of appearance, the upper is made differently for the men's shoe according to FIG. 2 and the women's shoe according to FIG. 3.

The interior of the footwear according to Fig. 1 consists of a sewing insole 2 with a lower nonwoven fibrous layer 2,1 and an upper foam layer 2.2 with open pores and shape memory and an insole 3 composed of a lower layer 3.1, which has on its underside in areas with the highest concentration of foot pressure - in the area under the toes, the area under the metatarsal bones, the area under the middle and back edge of the foot and in the area under the heel bone - the raised raised parts of the gel filling are situated 3.4. In Fig. 1, the bottom layer 3.1 is shown in a bottom view. These raised parts of the gel filling 3.4 can be anchored in the upper foam layer 2.2 of the shape-memory sewing insole 2 by pressing. The insole 3 further comprises a middle layer 3.2 based on a damping foam with shape memory and an upper textile layer 3.3. The glued sole part 4 comprises a midsole 4.1 based on expanded polyurethane and a tread layer 4.2 based on compact thermoplastic polyurethane.

The sewing insole 2 has on the upper surface of the lower nonwoven fibrous layer 2.1 an upper expanded layer 2.2 based on open cell polyurethane foam with shape memory attached. In this foamed layer 2,2, the raised parts of the gel filling 3.4 are anchored by inserting an insole 3, which are made of compact polyurethane with the ability to compensate for the loss of tissue on the foot to reduce the risk of skin cracking and ulcers.

The insole 3 comprises a bottom layer 3.1 and a middle layer 3.2 based on damping materials with open pores, these layers 3.1, 3.2 being connected in points to ventilate the air around the foot. The bottom layer 3.1 of the insole 3 is made of a permanently flexible polymeric material, in particular polyurethane with open pores, without permanent deformation under load. The middle layer 3.2 of the insole 3 is made of shaped polymeric foam, in particular based on open-pore polyurethane with the ability to adapt to the original shape of the user's foot, including possible deformities or even minor amputations.

The midsole 4.1 of the sole part 4 is made of a lightweight polymeric material, in particular polyurethane with the ability to absorb shocks when walking. The tread layer 4.2 of the sole part 4 has an overlap of 3 to 4 mm to increase the walking stability of the upper. It is made of a polymeric material, especially compact polyurethane, and is provided with a finely chopped pattern with anti-slip properties.

Claims (8)

PATENT CLAIMS 1. Multi-purpose footwear for diabetics with an optimized construction, suitable as walking, social and hiking footwear, with a sole part glued to the upper, characterized in that its derby upper (1) has a reduced derbu with a closure capable of compensating for possible slight foot deformities, stiffening the upper parts, in particular the heel and the toe, are made of flexible thermoplastic materials with shape memory, the interior of the footwear consists of a sewing insole (2) with a lower non-woven fibrous layer (2.1) and an upper foam layer (2.2) with open pores and shape memory, and insole (3) consisting of a lower layer (3.1) which has on its underside in areas with the highest concentration of foot pressure, in particular in the area under the toes, the area under the metatarsal bones, the area under the middle and back edge of the foot and in the area under the heel bone, situated in the form of raised raised parts of the gel filling (3.4) by pressing anchored in the upper lightened layer (2.2) of a sewing insole (2) with a shaped for memories, from the middle layer (3.2) based on shape memory cushioning foam and the upper textile layer (3.3), while the glued sole part (4) contains a midsole (4.1) based on expanded polyurethane and a tread layer (4.2) based on compact thermoplastic polyurethane. Multi-purpose footwear according to claim 1, characterized in that the sewing insole (2) has an upper foam layer (2.2) based on open-cell polyurethane foam with shape memory attached to the upper surface of the lower nonwoven fibrous layer (2.1), that in this foamed layer (2.2) the raised inserts of the gel filling (3.4) of the insole (3), which are made of compact polyurethane with the ability to compensate for the loss of tissue on the foot, are anchored, to reduce the risk of skin cracking and ulcers. Multi-purpose footwear according to claim 1, characterized in that the insole (3) comprises a bottom layer (3.1) and a middle layer (3.2) based on cushioning materials with open pores, said layers (3.1, 3.2) being for air ventilation around the foot connected in points. Multi-purpose footwear according to claim 1, characterized in that the bottom layer (3.1) of the insole (3) is made of a permanently flexible polymeric material, in particular polyurethane with open pores, without permanent deformation under load. Multi-purpose footwear according to claim 1, characterized in that the middle layer (3.2) of the insole (3) is made of shaped polymeric foam, in particular based on open-pore polyurethane with the ability to adapt to the original shape of the user's foot, including any deformations or minor amputation. Multi-purpose footwear according to claim 1, characterized in that the midsole (4.1) of the sole part (4) is made of a lightweight polymeric material, in particular polyurethane with the ability to absorb shocks when walking. Multi-purpose footwear according to claim 1, characterized in that the tread layer (4.2) of the sole part (4) has an overlap of 3 to 4 mm in order to increase the walking stability of the upper. Multi-purpose footwear according to claim 1, characterized in that the tread layer (4.2) of the sole part (4) is made of a polymeric material, in particular a compact polyurethane, and is provided with a finely chopped pattern with anti-slip properties.