Cranial 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 a human skull, particularly that of an infant. Specifically, the present invention relates to a skull-correcting helmet that is configured to maintain a constant positional relationship between the skull and the skull by using a liner disposed on the inner surface of the skull-correcting helmet, specifically its outer shell. Furthermore, the present invention relates to a skull-correcting helmet in which the liner is easily removable from the inner surface of the skull-correcting helmet. [Background technology]

[0002] Human infants, especially those over three months of age, may develop symptoms of cranial distortion, such as plagiocephaly, dolichocephaly, or brachycephaly. For example, in plagiocephaly, when viewed from above, the skull appears asymmetrical, tilted to one side. In dolichocephaly or brachycephaly, the skull is elongated or shortened in the anterior-posterior direction. If these conditions are left untreated and the distortion progresses, the position of the ears and face may 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, depending on the symptoms, in which a cranial shape correction helmet such as those exemplified in Patent Documents 1 and 2 is fitted to the infant's head and the infant lives daily in that state. Helmet treatment using the cranial shape correction helmets described in Patent Documents 1 and 2 makes it possible to gradually return the distorted shape of the skull to normal as the infant grows, and has been shown to have a certain degree of therapeutic effect.

[0004] Cranial shape correction helmets are typically made to fit the skull of each individual infant, taking into account both the current skull shape and the expected skull shape after correction. They generally include 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 from the infant, so it is recommended that it be replaced at the desired intervals. From the perspective of ease of replacement of the inner liner, it is considered preferable to attach the inner liner and outer shell via a hook-and-loop fastener. [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 orthodontic helmet fitted to the infant's skull for most of the day (e.g., 20 hours or more per day), including during sleep. During helmet therapy, if the cranial orthodontic helmet unintentionally slips or comes off, the caregiver (often the infant's guardian) must refit the helmet, which is extremely tedious. Therefore, to avoid such problems, caregivers must constantly monitor the infant. Furthermore, if a malfunction is noticed late, it can take a long time to refit or readjust the helmet's position. Furthermore, from a treatment perspective, frequent slippage or misalignment of the cranial orthodontic helmet, which is ideally intended to remain in a fixed position, can limit the effectiveness of treatment and potentially extend the treatment period beyond its intended duration.

[0007] While it is important to prevent the cranial shape correction helmet from slipping during helmet therapy, the inventors, based on their many years of experience developing cranial shape correction helmets, have discovered a new finding: whether or not the cranial shape correction helmet fits properly during the first few months of treatment can have a significant impact on the effectiveness and duration of treatment. Based on this finding, the inventors attempted to use a high-density soft polyurethane layer, which is thought to be able to minimize slippage of the cranial shape correction helmet, particularly for 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, they discovered a new problem: the bond to the hook-and-loop fastener 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 of the present invention have focused on the unique circumstances of helmet therapy and have conducted extensive research, leading to the completion of the invention described below.

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

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

[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 the cranial shape correction helmet described above.

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

[0015] The liner for a cranial shape correcting 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 lower resilience than the second foamed synthetic resin layer.

[0017] The liner for a cranial shape correcting 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 the cranial shape correction helmet 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. [Effects of the Invention]

[0020] The cranial shape correction helmet of the present invention uses an inner liner made of a material suitable for treatment, and with a simple configuration, it is possible to increase the coefficient of friction between the helmet, specifically the inner surface of its outer shell (described below), and the skull portion having the shape to be treated. This makes it possible to maintain the proper positional relationship between the skull portion and the helmet, i.e., to prevent misalignment due to the body movements of the infant wearing the helmet. As a result, it is possible to prevent the cranial shape correction helmet from unintentionally detaching from the skull portion. The liner of the present invention is made of a low-resilience material, which reduces the burden on the infant's skull portion. Furthermore, the cranial shape correction helmet of the present invention is easily detachable by joining the helmet body and the liner with a hook-and-loop fastener. This allows the helmet to be appropriately removed to change the shape as the treatment progresses, enabling effective treatment. [Brief explanation of the drawings]

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

[0022] The "outer shell" described in this specification is not particularly limited in terms of material, as long as it is capable of providing a hook-and-loop fastener member on at least a portion of its inner surface. 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. From the standpoints of ease of molding by powder sintering additive manufacturing, strength, and hardness, the outer shell is preferably made of polyamide, particularly polyamide 12. Furthermore, the Shore D hardness of the molded outer shell 100 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 synthetic resin, preferably 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 portion of the inner surface 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 removably attached to the adhesive layer of the inner liner described below. The shape of the hook-and-loop fastener member is not limited to these, and examples 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 on a portion of the inner surface of the outer shell. When the hook-and-loop fastener member is provided on a portion 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 each of the positions corresponding to the forehead, both sides of the head, and / or 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, if the outer shell is made of a synthetic resin, the hook-and-loop fastener member may be attached to the inner surface of the outer shell with 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, slits are provided on both sides of the head of the outer shell. In a preferred embodiment of the present invention, the slits extend 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 be provided with multiple ventilation holes. This improves ventilation between the inside and outside of the cranial shape correction helmet, which is expected to have advantageous effects in terms of dissipating sweat from the infant being treated and dissipating heat generated inside the cranial shape correction helmet. If the outer shell has a mesh structure, the mesh in the area where the hook-and-loop fastener is attached may be finer than in other areas (i.e., areas where the hook-and-loop fastener is not attached), or the mesh may be embedded. This increases the contact area between the outer shell and the hook-and-loop fastener, allowing the hook-and-loop fastener to be attached 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 needed. Doctors may check the distance between the inside of the helmet and the head to be corrected by inserting a finger, pen, ruler, or the like through holes in the mesh to check the growth of the skull. Therefore, enlarging the mesh in at least a portion of the left and right occipital regions can facilitate the doctor's examination.

[0030] The outer shell may have a peripheral edge reinforced by a peripheral reinforcement. The peripheral reinforcement may be thicker than the remaining portions of the outer shell (portions excluding the peripheral reinforcement). The cross-sectional shape of the peripheral reinforcement is not particularly limited, but 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 where the thickness is increased in the peripheral portions of the front shell and the rear shell, together with the approximately circular upper edge that defines the summit opening.

[0031] In one embodiment of the present invention, the thickness of the peripheral edge of the outer shell is configured to be thicker than the thickness of the remaining portion.

[0032] A pair of vertically extending reinforcing portions may be provided on both front side surfaces of the outer shell. The provision of the reinforcing portions allows the baby's ears to be inserted into the resulting curved portion, thereby generally fixing the positional relationship between the cranial shape correction helmet and the skull. This configuration can further stabilize the positional relationship between the helmet and the skull. Furthermore, to further increase the pressing force between the cranial shape correction helmet and the skull and further stabilize the positional relationship between them, thickened members (such as attachments) protruding from the inner surface of the outer shell toward the skull may be provided partially on the inner surface of the outer shell.

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

[0034] The liner used in the lid shape corrective helmet of the present invention is formed by bonding a first foamed synthetic resin layer and a second foamed synthetic resin layer together with an adhesive layer. Examples of such foamed synthetic resins are preferably selected from polyurethane, polystyrene, polyethylene, polypropylene, EVA cross-linked foam, PET resin foam, and phenol foam. Polyurethane resin is particularly preferred from the viewpoints of processability and cost.

[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 the layer that faces the head when the helmet is worn. The first polyurethane layer is a soft polyurethane layer with 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 consist of 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 infant's skull, etc. The liner may be a single component or multiple components. From the viewpoint of ease of replacement (e.g., so that only the portion soiled by sweat or the like can be replaced), the liner is preferably multiple components (e.g., 2 to about 10 components, preferably 2 to about 6 components).

[0036] The first polyurethane layer described herein may be a "flexible polyurethane layer." The term "flexible polyurethane layer" is not particularly limited as long as it is a layer made primarily of flexible polyurethane. Flexible polyurethanes include, but are not limited to, polyester foam and polyether foam, with polyester foam being preferred. The flexible polyurethane layer may be a single layer or multiple layers (e.g., a combination of two or more flexible polyurethane layers with different impact resilience or density). The thickness of the flexible polyurethane layer is not particularly limited as long as the object of the present invention can be achieved, but 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 herein preferably has low resilience (resilience of, for example, about 0 to about 50% (about 50% or less), preferably about 0 to about 40% (about 40% or less), and more preferably about 0 to about 30% (about 30% or less)). The use of a soft polyurethane layer with low resilience makes it possible to maintain an appropriate positional relationship between the skull and the skull shape correction helmet, and is expected to provide a high therapeutic effect, particularly for infants immediately after the start of helmet therapy. Here, resilience is a numerical value expressed as a percentage of the ratio of the applied force to the rebound force. For example, a resilience of 100% means that when a weight is dropped on the material, the weight will rebound to its original position (original height), while a resilience of 0% means that it does not rebound at all and remains stationary.

[0038] The first polyurethane layer described herein can also be described as a "soft polyurethane layer having a high density." A "soft polyurethane layer having a high density" refers to a polyurethane layer having a density of 0.05-0.5 g / cm. 3 This means a soft polyurethane layer with a rebound 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 by adhesive, heat sealing or stitching.

[0040] The second foamed synthetic resin layer described herein also functions as an "adhesive layer" for the hook-and-loop fastener provided on the inside of the shell. The term "adhesive layer" is not particularly limited, as long as at least a portion of at least one surface can be detachably joined to the hook-and-loop fastener provided on the inner surface of the outer shell. The adhesive layer may be a single layer or multiple layers. Examples of adhesive layers include, but are not limited to, nylon and hook-and-loop fasteners (e.g., a loop-shaped adhesive layer if the hook-and-loop fastener provided on the inner surface of the outer shell is a hook-shaped adhesive layer, and a loop-shaped adhesive layer if the hook-and-loop fastener provided on the inner surface of the outer shell is a loop-shaped adhesive layer). 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 include 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 select a suitable adhesive layer taking into account the materials of the first polyurethane layer and 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 maintain its role of protecting the head, while the polyurethane layer in direct contact with the head can create a comfortable wearing environment.

[0045] The second polyurethane layer preferably engages with a hook-and-loop fastener provided on the inside of the shell to firmly bond it. If only the fastening 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 with a suitably raised surface. However, since the liner of the present invention is worn by infants for long periods of 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 cranial 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 shows one embodiment of the cranial shape correction helmet described herein. The cranial shape correction helmet 1 shown in FIG. 1 has a liner 20 attached to the inner surface of the outer shell 10 so as to cover the wearer's skull. The liner 20 includes a first polyurethane layer and a second polyurethane layer. The elasticity and thickness of this inner liner 20 allow for gradual correction of the skull shape of the infant or young child being treated. While the inner liner 20 is shown attached to the entire inner surface in FIG. 1, it may be attached only to areas deemed necessary, taking into consideration the treatment method, skull shape, etc.

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

[0049] Furthermore, compared with high-resilience polyester foam, low-resilience polyester foam has a higher coefficient of friction when it comes into surface contact with the skull, making it less likely to slip relative to the skull. For this reason, when used as a cushion on the inner surface of a helmet, it is less likely to cause problems such as misalignment between the cranial shape correction helmet and the skull, or even the unintentional removal of the cranial shape correction helmet from the skull. For these reasons, low-resilience polyester foam may be used for the first polyurethane layer 22 of the inner liner 20 attached to the inner surface of the outer shell 10 of the cranial shape correction helmet 1 shown in Figure 1.

[0050] For continuous treatment, it is desirable for the inner liner 20 to be attached to the inner surface of the outer shell 10 of the cranial shape correction helmet 1 and not move from the inner surface; therefore, it is possible to firmly attach it using double-sided tape or the like. However, in treatment for cranial shape correction, the shape of the cranial shape correction helmet itself is often adjusted depending on the progress of treatment and the growth of the skull, so it is desirable for the cranial shape correction helmet body and the inner liner to be detachable. For this reason, in the cranial shape correction helmet 1 shown in Figure 1, the inner liner 20 and the inner surface of the outer shell 10 are pressure-bonded together with a hook-and-loop fastener 40, fixing their relative positions. The entire surface of the hook-and-loop fastener 40 is composed of tiny hooks made of the material itself, which engage with the material on the opposing surface, thereby pressure-bonding the surfaces together.

[0051] In FIG. 1, four circular hook-and-loop fastener members 40a, 40b, 40c, and 40d are used, and are positioned 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 formed of tiny hooks made of the material itself. An adhesive layer (nylon sheet) 22, which will be described later, is provided on the surface of the inner liner 20. Therefore, the hook-and-loop fastener members 40 are pressure-bonded to the inner liner 20 via this nylon sheet 22. The other side of each 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 one having one side as a pressure-bonding surface. 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, with each hook-and-loop fastener piece being provided on the inner surface of the inner liner 20 and the outer shell 10.

[0052] A pair of reinforcing sections 30 are provided vertically on both front side surfaces of the outer shell 10. The provision of the reinforcing sections 30 allows the baby's ears to be inserted into the resulting curved sections, generally fixing the positional relationship between the cranial shape correction helmet 1 and the skull. This configuration further stabilizes the positional relationship between the helmet and the skull. In addition, to further increase the pressing force between the cranial shape correction helmet 1 and the skull and further stabilize the positional relationship between them, attachments (not shown) that protrude from the inner surface of the outer shell 10 toward the skull may be provided partially on the inner surface of the outer shell 10.

[0053] Figure 2 shows one embodiment of an 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 thicker than the second polyurethane layer 21.

[0054] FIG. 3 is a perspective view more clearly illustrating the state when the inner liner 20 and the inner surface of the outer shell 10 of the cranial shape correction helmet 1 are crimped together via the hook-and-loop fastener 40. The cranial shape correction helmet 1 is crimped together by a cranial shape correction surface 41, whose entire surface is composed of tiny hooks so that it can engage with the surface of another material. The cranial shape correction helmet 1 is crimped together by a cranial shape correction surface 41, which is cranial shape correction surface 41. The cranial shape correction surface 41 ...2 is cranial shape correction surface 42. The cranial shape correction surface 42 is cranial shape correction surface 42. The cranial shape correction surface 42 is cranial shape correction surface 42. The cranial shape correction surface 42 is cranial shape correction surface 42. The cranial shape correction surface 42 is cranial shape correction surface 42. The cranial shape correction

[0055] Furthermore, in the embodiment shown in FIG. 4A, the surface of the outer shell 10 is configured with a stylish mesh structure 400. This improves ventilation between the inside and outside of the cranial shape correction helmet, which is excellent in terms of dissipating sweat from the infant being treated and dissipating heat generated inside the cranial shape correction helmet. Furthermore, the mesh structure reduces the amount of material used, making the helmet lighter and less expensive. Furthermore, molding the resin material into the mesh structure results in dispersed resin orientation, resulting in excellent mechanical strength. While polyamide (nylon), polycarbonate, and other synthetic resin materials can be used for molding, polyamide, particularly polyamide 12, is preferred due to its ease of molding by powder sintering additive manufacturing and its strength and hardness. Furthermore, the Shore D hardness of the molded outer shell 10 is preferably about 70 to about 85, particularly about 75 to about 80.

[0056] Next, referring to Figure 4B, a diagram showing yet another embodiment of a skull shape correction helmet according to the present invention is shown. In this embodiment, a vertical slit is provided on either the left or right side of the outer shell 10. This configuration contributes to the breathability of the shell 10 and also contributes to the flexibility of the shell body, making it easier to attach the connecting band (not shown). The design of the shell exterior can be modified as needed. In this embodiment, a relatively large eye is provided in a portion of the back of the head, allowing a doctor to insert a stick or pen through the eye 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 Figure 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: Head shape correction helmet 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 a skull shape correction helmet that can be engaged with an outer shell via a hook-and-loop fastener, the liner includes at least a first foamed synthetic resin layer and a second foamed synthetic resin layer; the first foamed synthetic resin layer has a different impact resilience than the second foamed synthetic resin layer; the first foamed synthetic resin layer has a lower rebound resilience than the second foamed synthetic resin layer, The first foamed synthetic resin layer is thicker than the second foamed synthetic resin layer, the first foamed synthetic resin layer is disposed so as to face the head side, A liner for a cranial shape correction helmet, wherein the second foam synthetic resin layer is configured to be removably attached to the hook-and-loop fastener member.

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 stitching. 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. 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; Equipped with the first foamed synthetic resin layer has a different impact resilience than the second foamed synthetic resin layer; the first foamed synthetic resin layer has a lower rebound resilience than the second foamed synthetic resin layer, The first foamed synthetic resin layer is thicker than the second foamed synthetic resin layer, A hook-and-loop fastener is provided on at least a portion of the inside of the outer shell, A skull shape correcting helmet, wherein the second foam synthetic resin layer is configured to engage with the hook-and-loop fastener.

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