Skull shape correction helmet

Abstract

To provide a skull shape correction helmet which even a rough body moving infant who just started helmet treatment for correcting a skull shape can prevent, from unintendedly removing the skull shape correction helmet off the skull part, or from shifting a physical relationship between the helmet and the skull part.SOLUTION: A liner for use in skull shape correction helmet is equipped with an outer shell composed for covering a skull part and with a hook-and-loop fastener provided at least in a part of an inner surface side of the outer shell. The liner is made of gluing with an adhesion layer a first polyurethane layer and a second polyurethane layer, in the skull shape correction helmet, and the skull shape correction helmet is provided with this liner.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a helmet used to correct the shape of the skull of a human, particularly an infant. More particularly, the present invention relates to a skull correction helmet configured to maintain a constant positional relationship between the skull and the liner arranged on the inner surface of the skull correction helmet, specifically the outer shell, so that the pressure between the skull and the liner is appropriately maintained. Furthermore, the present invention relates to a skull correction helmet configured so that the liner can be easily removed from the inner surface of the skull correction helmet. [Background technology]

[0002] Human infants, especially those over about three months of age, may show symptoms such as plagiocephaly, dolichocephaly, or brachycephaly, in which the shape of the skull is distorted. For example, in plagiocephaly, when the infant's head is viewed from above, the skull is distorted and tilted to one side, resulting in left-right asymmetry. In dolichocephaly or brachycephaly, the front-to-back dimensions of the skull are longer or shorter. If these conditions are left untreated and the distortion progresses, the position of the ears and the face will become fixed in a deformed state as the infant grows.

[0003] For this reason, a treatment method (hereinafter also referred to as "helmet treatment") may be adopted in which, depending on the symptoms, a skull shape correction helmet as exemplified in Patent Documents 1 and 2 is fitted to the infant's head and the infant lives its daily life in that state. Helmet treatment using the skull shape correction helmet described in Patent Documents 1 and 2 makes it possible to gradually return the distorted skull shape to normal as the infant grows, and a certain degree of therapeutic effect has been obtained.

[0004] A cranial shape correction helmet is generally made to fit the cranial part of an individual infant to be treated, taking into consideration both the current shape of the cranial part and the shape expected after correction, and is equipped with an outer shell and an inner liner. The inner liner, which functions as a sort of cushion between the outer shell and the skull, can become contaminated by sweat of the infant, and is therefore recommended to be replaced at a desired time. From the viewpoint of ease of replacement of the inner liner, it is considered preferable to attach the inner liner and the outer shell via a hook-and-loop fastener member. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6833240 [Patent Document 2] Patent No. 6333514 Summary of the Invention [Problem to be solved by the invention]

[0006] It is recommended that helmet therapy be performed with the cranial correction helmet fitted to the skull of the infant being treated for most of the day, including during sleep (for example, 20 hours or more per day). In helmet therapy, if the cranial correction helmet unintentionally shifts or comes off, the caregiver, usually the guardian of the infant being treated, must refit the cranial correction helmet each time, which is very troublesome. Therefore, in order to avoid such problems, the caregiver must always pay attention to the infant being treated. Also, if the caregiver is late in noticing the problem, it will take a long time to refit the helmet or readjust the positional relationship. From the perspective of treatment, the cranial correction helmet, which should be continuously fitted in a fixed positional relationship, may come off or shift in position, limiting the effect of the treatment, which may result in the treatment period being unnecessarily longer than originally expected.

[0007] Thus, in helmet therapy, it is important to prevent the cranial shape correction helmet from slipping, and the inventors, based on their many years of experience in developing cranial shape correction helmets, have discovered a new finding that whether or not the cranial shape correction helmet is properly fitted in the first few months after the start of helmet therapy can have a significant impact on the therapeutic effect and duration. Based on this finding, the inventors have attempted to adopt a soft polyurethane layer with a high density, which is thought to be able to minimize slippage of the cranial shape correction helmet, especially in infants who have just started helmet therapy.

[0008] However, when the inventors attempted to use a high-density soft polyurethane layer as the inner liner and attach it to the outer shell via a hook-and-loop fastener member, they discovered a new problem in that the bond to the hook-and-loop fastener member was extremely weak, or did not bond at all, causing the inner liner to shift position very easily, resulting in an unsatisfactory cranial shape correction helmet. [Means for solving the problem]

[0009] The inventors have focused on these unique circumstances of helmet therapy, conducted intensive research, and completed the invention described below.

[0010] The present invention provides the following in summary.

[0011] A liner for use in a skull correction helmet, comprising: The liner includes at least a first foamed synthetic resin layer and a second foamed synthetic resin layer. Liner for skull correction helmets.

[0012] The foamed resin constituting the foamed synthetic resin layer is any one selected from polyurethane, polystyrene, polyethylene, polypropylene, EVA crosslinked foam, PET resin foam, and phenol foam; A liner for a cranial shape correction helmet as described above.

[0013] The foamed synthetic resin layer constituting the liner is bonded by any one of an adhesive layer, heat fusion and sewing. A liner for a cranial shape correction helmet as described above.

[0014] The adhesive layer is one selected from the group consisting of EVA (ethylene vinyl acetate), thermoplastic polyurethane, thermosetting polyurethane, polyester, polyamide, polyolefin, acrylic resin, and rubber, or any combination thereof. A liner for a cranial shape correction helmet as described above.

[0015] The liner for a cranial shape correction helmet described above, wherein the first foamed synthetic resin layer has a different resilience than the second foamed synthetic resin layer.

[0016] The liner for a cranial shape correction helmet described above, wherein the first foamed synthetic resin layer has a lower rebound elasticity compared to the second foamed synthetic resin layer.

[0017] The liner for a cranial shape correction helmet as described above, wherein the first foamed synthetic resin layer and the second foamed synthetic resin layer have different thicknesses.

[0018] The first foamed synthetic layer is thicker than the second foamed synthetic layer; A liner for a cranial shape correction helmet as described above.

[0019] an outer shell configured to cover a skull portion; a liner including at least a first foamed synthetic resin layer and a second foamed synthetic resin layer; A skull correction helmet. Effect of the Invention

[0020] According to the cranial shape correction helmet of the present invention, it is possible to increase the coefficient of friction between the helmet, specifically the inner surface of its outer shell described later, and the skull part having the shape to be treated, by using an inner liner made of a material suitable for treatment, with a simple configuration. This makes it possible to properly maintain the positional relationship between the skull part and the helmet, that is, to suppress the displacement between them due to the body movement of the baby wearing the helmet. As a result, it is possible to prevent the cranial shape correction helmet from being unintentionally removed from the skull part. Since the liner of the present invention uses a low-resilience elastic material, it is possible to reduce the burden on the skull part of the baby. In addition, the cranial shape correction helmet of the present invention makes the liner easily removable by joining the helmet body and the liner with a hook-and-loop fastener member. This makes it possible to change the shape by appropriately removing the member according to the progress of treatment, and to perform effective treatment. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 is a schematic overall front view of one embodiment of a cranial contouring helmet described herein. [Diagram 2] FIG. 2 is a diagram illustrating the construction of the liners described herein. [Diagram 3] FIG. 3 is an exploded partial perspective view showing the relationship between an inner liner and a hook-and-loop fastener member used in the helmet described herein. [Figure 4] FIG. 4 is a perspective view of another embodiment of a cranial contouring helmet described herein. [Diagram 5] FIG. 5 is a bottom view of the helmet shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] The "outer shell" described in this specification is not particularly limited in terms of material, etc., as long as it is capable of providing a hook-and-loop fastener member on at least a part of its inner surface side. The outer shell may be made of, for example, a synthetic resin. Examples of synthetic resins include, but are not limited to, polyamide (nylon), polycarbonate, polyester, polyacetal, polyethylene, polypropylene, polyvinyl chloride, polystyrene, polybutylene, ABS resin, cellulose-based resin, acrylic resin, epoxy resin, and fluororesin. The outer shell is preferably made of polyamide, particularly polyamide 12, in terms of ease of molding by powder sintering layered manufacturing method, strength, and hardness. The Shore D hardness of the outer shell 100 after molding is preferably, for example, about 70 to about 85, particularly about 75 to about 80.

[0023] In one embodiment of the invention, the outer shell is made of a synthetic resin, preferably a polyamide, more preferably polyamide 12.

[0024] In one embodiment of the present invention, a hook-and-loop fastener member can be provided on at least a part of the inner surface side of the outer shell. Such a hook-and-loop fastener is not particularly limited in size, shape, material, position, etc., as long as it can be detachably attached to the adhesive layer of the inner liner described later. The shape of the hook-and-loop fastener member is not limited to these, but examples thereof include a substantially triangular, substantially rectangular, substantially square, substantially pentagonal, substantially hexagonal, substantially circular, and substantially elliptical shape. The hook-and-loop fastener member may be provided on substantially the entire inner surface of the outer shell, or may be provided on a part of the inner surface of the outer shell. When the hook-and-loop fastener member is provided on a part of the inner surface of the outer shell, one or more hook-and-loop fastener members (e.g., 2 to about 10) may be provided at a position corresponding to the forehead, positions corresponding to both sides of the head, and / or positions corresponding to the back of the head.

[0025] The hook-and-loop fastener member can be attached to the inner surface of the outer shell in a desired manner, taking into consideration the material of the outer shell. For example, when the outer shell is made of a synthetic resin, the hook-and-loop fastener member can be attached to the inner surface of the outer shell by an adhesive.

[0026] The outer shell may have a slit between the front shell and the rear shell. This allows the slit to be opened appropriately according to the growth of the skull, making it easy to adjust the positional relationship between the front shell and the rear shell. The slit may extend from the upper edge to the lower edge of both sides of the head. This allows the outer shell to be separated into the front shell and the rear shell.

[0027] In one embodiment of the present invention, a slit is provided on both sides of the outer shell. In a preferred embodiment of the present invention, the slit extends from the upper edge to the lower edge of both sides of the head, thereby dividing the outer shell into a front shell and a rear shell.

[0028] The surface of the outer shell may have a mesh structure or may have multiple ventilation holes. This improves ventilation between the inside and outside of the skull shape correction helmet, and is expected to have advantageous effects in terms of dissipating sweat from the infant being treated and dissipating heat generated inside the skull shape correction helmet. When the outer shell has a mesh structure, the mesh may be finer or filled in at the portion where the hook-and-loop fastener member is attached than at other portions (i.e., portions where the hook-and-loop fastener member is not attached). This increases the contact area between the outer shell and the hook-and-loop fastener member, making it possible to attach the hook-and-loop fastener member more firmly.

[0029] In one embodiment of the present invention, the outer shell has a mesh structure. Alternatively, the mesh size of the outer shell can be changed as appropriate. A doctor may check the distance between the inside of the helmet and the head to be corrected by inserting a finger, pen, ruler, etc. through a hole in the mesh to check the growth of the skull. For this reason, by enlarging the mesh in at least a portion of the left and right back of the head, the doctor's examination can be made easier.

[0030] The outer shell may have a peripheral portion reinforced by a peripheral reinforcement. The peripheral reinforcement may be thicker than the remaining portion of the outer shell (except for the peripheral reinforcement). The cross-sectional shape of the peripheral reinforcement is not particularly limited, and may be, for example, a so-called circular edging that is approximately circular with a diameter of about 4 to about 8 mm. In this case, the thickness of the portion of the outer shell excluding the peripheral reinforcement may be, for example, about 2 to about 4 mm. The peripheral reinforcement may be, for example, a portion in which the thickness is increased in the peripheral portion of the front shell and the peripheral portion of the rear shell together with the approximately circular upper edge that defines the summit opening.

[0031] In one embodiment of the invention, the thickness of the periphery of the outer shell is greater than the thickness of the remaining portions.

[0032] A pair of reinforcing parts may be provided vertically on both front side surfaces of the outer shell. By providing the reinforcing parts, the baby's ears can be inserted into the curved parts formed as a result, and the positional relationship between the skull shape correction helmet and the skull part can be generally fixed. By configuring in this way, the positional relationship between the helmet and the skull part can be more stable. In addition, in order to further increase the pressing force between the skull shape correction helmet and the skull part and to further stabilize the positional relationship between them, a thickening member (attachment, etc.) protruding from the inner surface of the outer shell toward the skull part may be further partially provided on the inner surface of the outer shell.

[0033] In one embodiment of the present invention, the outer shell further has a pair of reinforcing portions in the vertical direction on both front side surfaces.

[0034] The liner used in the lid shape correction helmet of the present invention is formed by bonding a first foamed synthetic resin layer and a second foamed synthetic resin layer with an adhesive layer. Examples of such foamed synthetic resins are preferably any one selected from polyurethane, polystyrene, polyethylene, polypropylene, EVA crosslinked foam, PET resin foam, and phenol foam. From the viewpoint of processability and cost, polyurethane resin is particularly preferable.

[0035] Next, as one embodiment of the present invention, an embodiment in which the foamed synthetic resin layer is polyurethane will be described. The first polyurethane layer is a layer that is on the head side when the helmet is worn. The first polyurethane layer is a soft polyurethane layer having a high density, and is not particularly limited as long as it can be adhered to the second polyurethane layer via an adhesive layer. The liner may be only the first polyurethane layer and the second polyurethane layer, or may include other layers between them. The liner can be of a desired thickness taking into consideration the size of the outer shell and the baby's skull, etc. The liner may be one member or multiple members. From the viewpoint of ease of replacement (for example, so that only the parts soiled with sweat etc. can be replaced), the liner is preferably multiple members (for example, 2 to about 10 members, preferably 2 to about 6 members).

[0036] The first polyurethane layer described in this specification may be a "soft polyurethane layer". The term "soft polyurethane layer" is not particularly limited as long as it is a layer mainly made of soft polyurethane. Examples of soft polyurethane include, but are not limited to, polyester foam and polyether foam, and preferably polyester foam. The soft polyurethane layer may be a single layer or multiple layers (for example, a combination of two or more types of soft polyurethane layers having different resilience and density). The thickness of the soft polyurethane layer is not particularly limited as long as the object of the present invention can be achieved, and may be, for example, about 1 to about 50 mm, preferably about 2 to about 40 mm, more preferably about 3 to about 30 mm, and even more preferably about 4 to about 20 mm.

[0037] The first polyurethane layer described in this specification is preferably low-resilience (resilience is, for example, about 0 to about 50% (about 50 or less), preferably about 0 to about 40% (about 40% or less), more preferably about 0 to about 30% (about 30% or less)). By using a low-resilience soft polyurethane layer, it is possible to properly maintain the positional relationship between the skull part and the skull shape correction helmet, and a high therapeutic effect can be expected, especially for infants and young children immediately after starting helmet treatment. Here, the resilience is a numerical value that represents the ratio of the applied force to the rebound force, expressed as a percentage. For example, a resilience of 100% means that when a weight is dropped on the material, the weight rebounds to its original position (original height), and conversely, a resilience of 0% means that it does not rebound at all and remains stationary in place.

[0038] The first polyurethane layer described in this specification can also be described as a "soft polyurethane layer having a high density". A "soft polyurethane layer having a high density" is a polyurethane layer having a density of 0.05-0.5 g / cm 3 This means a soft polyurethane layer with a resilience of 20% to 60%. By using a soft polyurethane layer with high density, a higher therapeutic effect can be expected.

[0039] The first and second foamed synthetic resin layers may be attached together by any suitable means such as an adhesive layer, heat sealing or stitching.

[0040] The second foamed synthetic resin layer described in this specification also functions as an "adhesive layer" of the hook-and-loop fastener member provided on the inside of the shell. The "adhesive layer" is not particularly limited as long as at least a part of at least one surface can be detachably joined to the hook-and-loop fastener member provided on the inner surface of the outer shell. The adhesive layer may be a single layer or multiple layers. The adhesive layer is not limited to these, but examples thereof include nylon and hook-and-loop fasteners (for example, if the hook-and-loop fastener member provided on the inner surface of the outer shell includes a hook shape, then a loop shape, and if the hook-and-loop fastener member provided on the inner surface of the outer shell includes a loop shape, then a hook shape). The thickness of the second polyurethane layer is not particularly limited as long as the object of the present invention can be achieved, but can be appropriately selected, for example, between about 2 and about 20 mm.

[0041] In the above embodiment, the first polyurethane layer and the second polyurethane layer are attached together via an adhesive layer to form the liner of the present invention.

[0042] In one embodiment of the invention, the first and second polyurethane layers comprise expanded polyester foam.

[0043] In the present invention, the first polyurethane layer and the second polyurethane layer are bonded together via an adhesive layer to form a liner. The adhesive layer is made of an adhesive, and examples of the adhesive may be one selected from the group consisting of EVA (ethylene vinyl acetate), thermoplastic polyurethane, thermosetting polyurethane, polyester, polyamide, polyolefin, acrylic resin, and rubber, or any combination thereof. Those skilled in the art can appropriately select a suitable adhesive layer in consideration of the material of the first polyurethane layer and the material of the second polyurethane layer.

[0044] In the present invention, the first polyurethane layer is preferably softer than the second polyurethane layer, so that the polyurethane layer in direct contact with the head can create a comfortable wearing environment while the polyurethane layer in contact with the head can maintain its role of protecting the head.

[0045] It is preferable that the second polyurethane layer is firmly attached by engaging with a hook-and-loop fastener provided on the inside of the shell. If only the attachment to the hook-and-loop fastener is considered, the second polyurethane layer may be made of the same hook-and-loop fastener, or may be substituted with a nylon cloth having a suitably raised surface. However, since the liner of the present invention is worn by an infant for a long time and it is preferable to keep it clean, it is preferable to use a polyurethane layer that is easy to wash with water and dries quickly.

[0046] The embodiments of the skull shape correction helmet described in this specification will be described in more detail below with reference to the drawings, but are not intended to limit the present invention in any way.

[0047] FIG. 1 is a diagram showing one embodiment of the skull shape correction helmet described in this specification. The skull shape correction helmet 1 shown in FIG. 1 has a liner 20 provided on the inner surface side of the outer shell 10 so as to cover the skull of the wearer. The liner 20 includes a first polyurethane layer and a second polyurethane layer. The elasticity and thickness of this inner liner 20 gradually corrects the shape of the skull of the infant to be treated. In FIG. 1, the inner liner 20 is provided on the entire inner surface, but it may be provided only on the part considered necessary, taking into consideration the treatment method, the shape of the skull, etc.

[0048] If the liner used in the helmet for correcting the shape of the skull has too much resilience, the liner will always exert a repulsive force on the skull, placing a large burden on the skull of the infant. In consideration of this, it is preferable to use a polyester foam with low resilience (e.g., resilience of 30% or less) so that the effects of treatment can be obtained while reducing the burden on the infant being treated.

[0049] In addition, compared to high-resilience polyester foam, low-resilience polyester foam has a larger coefficient of friction when it comes into surface contact with the skull, and therefore they are less likely to slip on each other. For this reason, when used as a cushion for the inner surface of a helmet, problems such as misalignment of the skull shape correction helmet and the skull part, and even unintentional removal of the skull shape correction helmet from the skull part, are unlikely to occur. For this reason, low-resilience polyester foam may be used as the first polyurethane layer 22 of the inner liner 20 attached to the inner surface of the outer shell 10 of the skull shape correction helmet 1 shown in Figure 1.

[0050] For continuous treatment, it is desirable that the inner liner 20 is attached to the inner surface of the outer shell 10 of the skull shape correction helmet 1 and does not move from the inner surface, and in this respect, it is considered to firmly attach it using double-sided tape or the like. However, in treatment for skull shape correction, the shape of the skull shape correction helmet itself is often adjusted depending on the progress of treatment and the growth of the skull part, and it is desirable that the skull shape correction helmet main body and the inner liner are configured to be detachable. For this reason, in the skull shape correction helmet 1 shown in FIG. 1, the inner liner 20 and the inner surface of the outer shell 10 are pressure-bonded with a hook-and-loop fastener member 40 to fix their positional relationship. The hook-and-loop fastener member 40 has a surface that is made of minute hooks of the material itself, and engages with the material of the opposing surface to pressure-bond the surfaces together.

[0051] In FIG. 1, four circular hook-and-loop fastener members 40a, 40b, 40c, and 40d are used, and are arranged at the forehead, both sides of the head, and the back of the head, respectively. One side of each of these hook-and-loop fastener members 40 is a so-called pressure-bonding surface, which is composed of minute hook shapes made of the material itself. The surface of the inner liner 20 is provided with an adhesive layer (nylon sheet) 22, which will be described later. Therefore, the hook-and-loop fastener member 40 is pressure-bonded to the inner liner 20 via this nylon sheet 22. The other side of the hook-and-loop fastener member 40 is firmly fixed to the inner surface of the outer shell 10 with an adhesive or the like. Here, the hook-and-loop fastener member is not limited to such a form in which one side is a pressure-bonding surface, and a hook-and-loop fastener member consisting of hook-and-loop fastener pieces having a pair of opposing pressure-bonding surfaces, as will be described later, may be used, and each of the hook-and-loop fastener pieces may be provided on the inner surface of the inner liner 20 and the outer shell 10.

[0052] In addition, a pair of reinforcing parts 30 are provided vertically on both front side surfaces of the outer shell 10. The reinforcing parts 30 are provided, and the baby's ears are inserted into the curved parts formed as a result, so that the positional relationship between the skull shape correction helmet 1 and the skull part is generally fixed. With this configuration, the positional relationship between the helmet and the skull part is more stable. In addition, in order to further increase the pressing force between the skull shape correction helmet 1 and the skull part and to further stabilize the positional relationship between them, an attachment (not shown) protruding from the inner surface of the outer shell 10 toward the skull part may be further provided partially on the inner surface of the outer shell 10.

[0053] Figure 2 shows one embodiment of the inner liner 20 of the present invention. The liner 20 comprises a first polyurethane layer 22 and a second polyurethane layer bonded together via an adhesive layer 23. In Figure 2, the first polyurethane layer 22 is configured to be thicker than the second polyurethane layer 21.

[0054] FIG. 3 is a perspective view showing in an easier-to-understand manner the state when the inner liner 20 and the inner surface of the outer shell 10 of the skull shape correction helmet 1 are pressure-bonded to each other via the hook-and-loop fastener member 40. The pressure-bonding surface 41, the entire surface of which is formed in a minute hook shape so as to be able to engage with the surface of another material, is pressure-bonded to the surface of the inner liner 20 via the nylon sheet 21 in the direction of the arrow A. The other surface 42 is fixed to the inner surface of the outer shell 10 of the skull shape correction helmet 1 with an adhesive or the like in the direction of the arrow B. With this configuration, when the skull shape correction helmet 1 is fitted to the infant to be treated, the friction coefficient between the inner surface of the outer shell 10 and the inner liner 20 is maintained high, and the two do not easily slip. As a result, the positional relationship between the skull shape correction helmet 1 and the skull part is suppressed, and therefore the problem of the skull shape correction helmet being unintentionally removed is less likely to occur.

[0055] Furthermore, in the embodiment shown in FIG. 4A, the surface of the outer shell 10 is configured to have a mesh structure 400 with a design. This improves ventilation between the inside and outside of the skull shape correction helmet, and is excellent in terms of dissipating sweat from the infant to be treated and dissipating heat generated inside the skull shape correction helmet. In addition, since the mesh structure is adopted, the amount of material used can be reduced, the main body can be made lighter, and the price can be reduced. In addition, by molding the resin material into the mesh structure, the orientation of the resin is dispersed, so that it is also excellent in terms of mechanical strength. As the synthetic resin material for molding, polyamide (nylon), polycarbonate, etc. can be used, but polyamide, especially polyamide 12, is preferable in terms of ease of molding by powder sintering layered manufacturing method, strength and hardness. In addition, the Shore D hardness of the outer shell 10 after molding is preferably about 70 to about 85, especially about 75 to about 80.

[0056] Next, referring to FIG. 4B, a diagram showing yet another embodiment of the helmet for correcting skull shape according to the present invention is shown. In this embodiment, a slit is provided in the vertical direction in either the left or right direction of the outer shell 10. This configuration contributes to the breathability of the shell 10 and also contributes to the deflection of the shell body, making it easier to attach the connecting band (not shown). The design of the shell exterior can be changed as appropriate. In this embodiment, a relatively large eye portion is provided in a part of the back of the head, so that a doctor can insert a stick or pen through the eye portion to check the growth of the skull.

[0057] Next, the state in which the liner of the present invention is attached will be described with reference to Fig. 5. In the figure, the liner is depicted as one continuous piece, but it is also within the scope of the present invention to use a liner divided at suitable positions in the front, back, left and right directions.

[0058] The above describes the embodiments of the cranial shape correction helmet described in this specification, but these embodiments are merely examples and can be modified and changed as appropriate without departing from the spirit of the present invention. [Explanation of symbols]

[0059] 1: Helmets for correcting head shape 10: Outer shell 20: Inner liner 21: Second polyurethane layer 22: First polyurethane layer 23: Adhesive layer 40, 40a, 40b, 40c, 40d: hook-and-loop fastener members 41, 42: Surface of hook-and-loop fastener 400:Mesh structure

Claims

1. A liner for use in a skull correction helmet, comprising: The liner includes at least a first foamed synthetic resin layer and a second foamed synthetic resin layer. Liner for skull correction helmets.

2. The foamed resin constituting the foamed synthetic resin layer is any one selected from polyurethane, polystyrene, polyethylene, polypropylene, EVA crosslinked foam, PET resin foam, and phenol foam; A liner for a cranial shape correction helmet according to claim 1.

3. The foamed synthetic resin layer constituting the liner is bonded by any one of an adhesive layer, heat fusion and sewing. A liner for a cranial shape correction helmet according to claim 1.

4. The adhesive layer is one selected from the group consisting of EVA (ethylene vinyl acetate), thermoplastic polyurethane, thermosetting polyurethane, polyester, polyamide, polyolefin, acrylic resin, and rubber, or any combination thereof. A liner for a cranial shape correction helmet according to claim 3.

5. The liner for a cranial shape correction helmet according to claim 1, wherein the first foamed synthetic resin layer has a different resilience than the second foamed synthetic resin layer.

6. The liner for a cranial shape correction helmet according to claim 1, wherein the first foamed synthetic resin layer has a lower resilience than the second foamed synthetic resin layer.

7. The liner for a cranial shape correction helmet according to claim 1 , wherein the first foamed synthetic resin layer and the second foamed synthetic resin layer have different thicknesses.

8. The first foamed synthetic layer is thicker than the second foamed synthetic layer; A liner for a cranial shape correction helmet according to claim 1.

9. an outer shell configured to cover a skull portion; a liner including at least a first foamed synthetic resin layer and a second foamed synthetic resin layer; A skull correction helmet.

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