Cranial orthotic helmet

Abstract

To provide a cranial orthotic helmet that ensures a good texture and prevents hands from slipping on a shell when gripping the shell.SOLUTION: A cranial orthotic helmet 10 is to be worn on a head 2 in order to correct a cranial deformation, and comprises a substantially annular shell 11 having an upper opening 12 and a lower opening 13. The shell 11 of the cranial orthotic helmet 10 has a rough section 30 that is formed on the outer surface 111 of the shell, and in which a plurality of protrusions 31, i.e. raised portions, are arranged in a continuous manner.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a cranial shape correction helmet. [Background technology]

[0002] Conventionally, infants and small children may suffer from cranial deformities such as plagiocephaly, which requires treatment. For example, plagiocephaly is a deformed shape in which the skull is not symmetrical but tilted to one side. Patent Document 1 discloses a skull shape correction helmet, which is worn on the head to promote deformation so that the shape of the skull is corrected as the skull grows, as an orthosis for treating such cranial deformities. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-169510 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, when manufacturing a skull correction helmet, the outer surface of the shell may be polished to improve the texture. However, if the outer surface of the shell becomes smooth, there is a risk that the skull correction helmet may slip out of the hand and fall when the shell is held.

[0005] The present invention aims to provide a cranial shape correction helmet that ensures a good texture and prevents your hand from slipping when gripping the shell. [Means for solving the problem]

[0006] The cranial shape correction helmet is a cranial shape correction helmet that is worn on the head to correct cranial deformation, and comprises a substantially annular shell having an upper opening and a lower opening, and the shell has an uneven portion formed on its outer surface in which multiple raised portions are arranged in succession. Effect of the Invention

[0007] According to the present invention, a cranial shape correction helmet can be provided that ensures texture while preventing the hand from slipping when gripping the shell. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view showing a cranial shape correcting helmet according to one embodiment of the present invention being worn by a subject. [Diagram 2] FIG. 1 is a front view showing a cranial shape correction helmet according to one embodiment of the present invention. [Diagram 3] FIG. 1 is a left side view showing a cranial shape correcting helmet according to one embodiment of the present invention. [Figure 4] FIG. 1 is a right side view showing a cranial shape correcting helmet according to one embodiment of the present invention. [Diagram 5] FIG. 2 is a rear view showing a cranial shape correction helmet according to one embodiment of the present invention. [Figure 6] 3 is a cross-sectional view corresponding to the line VI-VI in FIG. 2. [Figure 7] 6 is an enlarged view of a main part of an area A1 shown in FIG. 5. [Figure 8] 7 is an enlarged view of a main part of an area A2 shown in FIG. 6. [Figure 9] 7 is an enlarged view of a main part of an area A3 shown in FIG. 6. [Figure 10] 13 is a front view showing a modified example of the uneven portion formed on the outer surface of the shell. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 to Fig. 5 are diagrams showing a state in which a subject 1 wears a cranial shape corrective helmet 10 of this embodiment. Fig. 6 is a cross-sectional view corresponding to line VI-VI in Fig. 2. Fig. 7 is an enlarged view of a main part of region A1 shown in Fig. 5. Fig. 8 is an enlarged view of a main part of region A2 shown in Fig. 6. Fig. 9 is an enlarged view of a main part of region A3 shown in Fig. 6.

[0010] In Fig. 1, Fig. 3, Fig. 4 and Fig. 6, the arrow X indicates the front-rear direction X of the skull shape correction helmet 10 when worn on the head 2 of the subject 1, and further, X1 indicates the front side and X2 indicates the rear side. In Fig. 2 and Fig. 5, the arrow Y indicates the left-right direction of the skull shape correction helmet 10 when worn on the head 2 of the subject 1, and further, Y1 indicates the right side and Y2 indicates the left side. In Figs. 1 to 7 and Fig. 9, the arrow Z indicates the up-down direction of the skull shape correction helmet 10 when worn on the head 2 of the subject 1, and further, Z1 indicates the upper side and Z2 indicates the lower side. In Fig. 1, the arrow C indicates the shell circumferential direction, which is the circumferential direction of the shell 11 of the skull shape correction helmet 10 described later. The shell circumferential direction is perpendicular to the up-down direction and is a direction along the outer surface 111 of the shell 11. In this specification, the left-right direction, the front-rear direction and the up-down direction mean the directions seen from the subject 1 wearing the skull shape correction helmet 10.

[0011] The skull shape correcting helmet 10 according to this embodiment is worn on the head 2 of a subject 1 to promote deformation so that the skull shape is corrected as the skull grows. Subjects 1 include, for example, infants and young children with skull deformations requiring treatment, such as plagiocephaly, brachycephaly, or dolichocephaly. Plagiocephaly is a deformed shape in which the skull is not symmetrical but tilted to one side. Brachycephaly is a deformed shape in which the skull is significantly short in the anterior-posterior dimension. Dolichocephaly is a deformed shape in which the skull is significantly long in the anterior-posterior dimension.

[0012] The cranial shape correcting helmet 10 includes an annular shell 11 and a cushion (not shown) that is disposed inside the shell 11 and comes into contact with the head 2.

[0013] The cushion is a molded body of foamed synthetic resin having resilience. The cushion reduces damage to the scalp that occurs when the skull to be corrected is directly pressed against the hard shell 11. The cushion is detachably attached to the inner surface 112 of the shell 11, for example, via a double-sided adhesive tape.

[0014] As shown in FIG. 1 , the shell 11 has a main portion 14, an upper opening 12, a lower opening 13, a rear extension 15, a pair of side protrusions 16, a dimension adjustment mechanism 20 formed in the main portion 14, a plurality of air vents 17, a plurality of palpation holes 18, and an uneven portion 30.

[0015] The main part 14 is an annular part that surrounds the head 2 of the subject 1 in the shell circumferential direction. A rear extension part 15 is formed at the rear part of the main part 14, and side protrusion parts 16 are formed on the left and right side parts of the main part 14, respectively.

[0016] 2 to 6, the back extension portion 15 is a portion that extends downward from the rear portion of the main portion 14. The back extension portion 15 faces the back of the neck of the subject 1.

[0017] 1 to 4, the side protrusions 16 protrude downward from the left and right side surfaces of the main part 14. Each side protrusion 16 is located in front of the ear 3 of the subject 1. The ear 3 of the subject 1 is located between the rear extension 15 and each side protrusion 16.

[0018] The upper opening 12 is an opening formed by an upper opening edge 12a which is an upper edge of the main portion 14. From the upper opening 12 upward, the top of the head 2 is exposed.

[0019] The lower opening 13 is an opening formed by a lower opening edge 13a which is the lower edge of the main part 14, the lower edge of the back extension part 15, and the lower edges of the pair of side protrusion parts 16. From the lower opening 13 downward, the face, ears, neck, etc. of the subject 1 are exposed.

[0020] Here, the shell 11 according to this embodiment is formed by stacking the modeling material one layer at a time. That is, the shell 11 is a laminate formed by stacking the modeling material. The modeling material may be various resins such as thermoplastic resins and ultraviolet curing resins. The type of resin is selected according to the molding method. The molding method of the shell 11 will be described later. In this specification, the direction in which the modeling material is stacked in molding the shell 11 is referred to as the stacking direction. The shell 11 according to this embodiment is formed from the lower opening 13 side toward the upper opening 12 side. That is, in this embodiment, the stacking direction is approximately the same as the up-down direction.

[0021] The dimension adjustment mechanism 20 is a mechanism for adjusting the diameter of the shell 11, and is formed on one of the left and right sides of the shell 11. As shown in Fig. 6, the dimension adjustment mechanism 20 has a slit 23, an end piece 24, an extension piece 25, and a band-shaped body (not shown).

[0022] 6, the slit 23 is formed from the upper opening edge 12a of the upper opening 12 to the lower opening edge 13a of the lower opening 13. The main portion 14 is formed with a front first end portion 21 and a rear second end portion 22 which are opposed to each other and can be separated from each other with the slit 23 therebetween.

[0023] 6, the end piece 24 is a part of the main part 14, and is a region from the first end 21 to a position where the right side protrusion 16 protrudes in the front-rear direction. The end piece 24 is formed with two fitting slits 241 that are approximately parallel in the left-right direction and spaced apart in the up-down direction.

[0024] 4, the extension piece 25 is a part of the main portion 14, and extends from the second end portion 22 toward the front side of the shell 11 along the shell circumferential direction. The extension piece 25 overlaps with the end piece 24 in the thickness direction of the shell 11. The extension piece 25 has a connection portion 251 that is connected to the outer surface 111 side of the first end portion 21 and extends along the first end portion 21, a cover portion 252 that extends from the connection portion 251 along the shell circumferential direction and covers the end piece 24, and two fitting protrusions 253.

[0025] As shown in FIG. 6, the fitting protrusion 253 protrudes from the surface of the cover part 252 on the inner surface 112 side and fits into each of the two fitting slit parts 241. The fitting protrusion 253 fits into the fitting slit part 241 so as to be slidable in the shell circumferential direction. With this configuration, the diameter of the main part 14 can be adjusted by changing the position of the fitting protrusion 253 in the fitting slit part 241. Specifically, as the fitting protrusion 253 approaches the rear end part 242 of the fitting slit part 241, the interval between the first end part 21 and the second end part 22 widens, and the diameter of the main part 14 increases. Conversely, as the fitting protrusion 253 approaches the front end part 243 of the fitting slit part 241, the interval between the first end part 21 and the second end part 22 narrows, and the diameter of the main part 14 decreases.

[0026] The band-shaped body is hung over pins (not shown) inserted into two through holes 211, 212 penetrating the shell 11, and extends in the shell circumferential direction. As shown in FIG. 6, the through hole 211 is formed in the vicinity of the first end 21 of the shell 11, rearward of the first end 21. The through hole 212 is formed in the vicinity of the end piece 24 of the shell 11, forward of the end piece 24. The band-shaped body is formed so that its length in the shell circumferential direction can be adjusted. By fixing the length of the band-shaped body in the shell circumferential direction, the distance between the through holes 211, 212 is fixed. That is, the distance between the first end 21 and the second end 22 is fixed, and the diameter of the shell 11 is fixed.

[0027] The multiple ventilation holes 17 penetrate the shell 11 in the thickness direction, and communicate between the inside and outside of the shell 11. The multiple ventilation holes 17 may have any shape, such as a circular shape, a trapezoidal shape, or a triangular shape. The multiple ventilation holes 17 may have non-uniform sizes and may have a variety of sizes. In this embodiment, the ventilation holes 17 contribute to weight reduction as well as ensuring breathability.

[0028] 8, the diameter of ventilation hole 17 in this embodiment is formed to become smaller from inner surface 112 to outer surface 111 of shell 11. This makes it possible to enlarge ventilation hole 17 while suppressing the opening area of ​​ventilation hole 17 formed on outer surface 111, thereby making it possible to make shell 11 lighter while maintaining the texture of outer surface 111.

[0029] As shown in FIG. 9, the multiple palpation holes 18 penetrate the shell 11 in the thickness direction and communicate between the inside and outside of the shell 11. The multiple palpation holes 18 may have any shape, such as a circle, a trapezoid, or a triangle. The multiple palpation holes 18 may be of different sizes. The opening diameter of the palpation holes 18 is larger than that of the air vent 17 and is used for palpation of the head 2. The palpation hole 18 in this embodiment is a hole with a diameter of 10 mm to 25 mm so that a finger can be inserted.

[0030] As shown in Fig. 5, in this embodiment, multiple palpation holes 18 are formed from the center to the right side of the rear part of the main portion 14. Also, as shown in Fig. 9, palpation holes 18 are formed so that their diameter is smallest at the center in the thickness direction of shell 11 and increases in diameter as they move away from this center. That is, inner peripheral surface 181 of palpation hole 18 is inclined so that the diameter of palpation hole 18 increases from the center in the thickness direction of palpation hole 18 toward outer surface 111 and inner surface 112.

[0031] The uneven portion 30 is formed on the outer surface 111 of the shell 11, and is a portion where a plurality of raised portions are arranged in succession. Here, "a plurality of raised portions arranged in succession" means that the plurality of raised portions are arranged with a region that is lower in the thickness direction of the shell 11 than the raised portions in any direction, i.e., a region where the thickness of the shell 11 is thinner than the raised portions (hereinafter referred to as a low region) sandwiched between them. In other words, "a plurality of raised portions arranged in succession" means that the raised portions and low regions are arranged alternately and continuously in any direction.

[0032] The plurality of raised portions may be irregular or substantially equal in size, height, shape, etc. Also, the plurality of raised portions may be regularly arranged at regular intervals, or irregularly arranged at irregular intervals.

[0033] As shown in Figs. 1 to 7, the uneven portion 30 of this embodiment has a plurality of protrusions (raised portions) 31 and a plurality of grooves (low regions) 32. The protrusions 31 extend in a direction perpendicular to the stacking direction on the outer surface 111 of the shell 11, i.e., in the shell circumferential direction. The grooves 32 extend in a direction perpendicular to the stacking direction on the outer surface 111 of the shell 11, i.e., in the shell circumferential direction. As shown in Fig. 7, the protrusions 31 and the grooves 32 are alternately and continuously arranged in the stacking direction. As shown in Figs. 8 and 9, the outer surface 111 on which the uneven portion 30 is formed has a wave shape in a vertical cross section.

[0034] The multiple protrusions 31 may be irregular or substantially equal in size, height, shape, etc. The multiple grooves 32 may be irregular or substantially equal in size, height, shape, etc. The multiple protrusions 31 and the multiple grooves 32 may be regularly or irregularly arranged. In this embodiment, the multiple protrusions 31 and the multiple grooves 32 are regularly arranged in the stacking direction.

[0035] 8, the distance d2 between the top 311 of the protrusion 31 and the bottom 321 of the groove 32 adjacent to the protrusion 31 in the thickness direction of the shell 11 is preferably 0.05 mm to 1.0 mm. In other words, the distance d2 between the thickest part of the raised portion and the thinnest part of the low region adjacent to the raised portion is preferably 0.05 mm to 1.0 mm.

[0036] 8, thickness d of shell 11 is preferably 2 mm to 10 mm in terms of strength and weight of shell 11. Thickness d1 of shell 11 in this embodiment is approximately 3 mm. Note that, in this embodiment, thickness d1 of shell 11 refers to the distance from inner surface 112 of shell 11 to bottom 321 of groove portion 32 in the thickness direction of shell 11.

[0037] In this embodiment, the protrusions 31 and the grooves 32 are formed on the outer surface 111 of the shell 11 so as to extend over the entire circumferential direction of the shell from the first end 21 to the second end 22 of the main portion 14. The protrusions 31 and the grooves 32 are also formed over the entire circumferential direction of the shell on the rear extension portion 15, the side protrusion portion 16, and the cover portion 252. The outer surface 111 of the connection portion 251 is flat and does not have the protrusions 31 and the grooves 32 formed thereon.

[0038] 7 and 9, an uneven portion 30 is formed on an inner circumferential surface 181 of the palpation hole 18 on the outer surface 111 side of the shell 11. The protrusions 31 and the grooves 32 are formed continuously from the outer surface 111 of the main portion 14 to the inner circumferential surface 181 of the palpation hole 18 on the outer surface 111 side.

[0039] 6, 8 and 9, the inner surface 112 of the shell 11 is flat. This allows the cushion to be attached more easily and firmly to the inner surface 112 of the shell 11 using a double-sided adhesive tape or the like.

[0040] Next, a molding method (manufacturing method) of the shell 11 according to this embodiment will be described. The shell 11 of the cranial shape correcting helmet 10 is designed based on a three-dimensional model of the ideal head 2 that is the treatment target for each subject 1. Based on this three-dimensional model, three-dimensional data regarding the shape of the shell 11 is created. The three-dimensional data of the shell 11 includes the uneven portion 30.

[0041] The shell 11 according to this embodiment is formed by a 3D printer using three-dimensional data of the shell 11. There are various specific methods for forming the shell 11 by a 3D printer, and examples of such methods include well-known methods such as a liquid vat photopolymerization method, a material jetting method, a binder jetting method, a powder bed fusion method, a material extrusion method, a directed energy deposition modeling method, and a sheet lamination method.

[0042] For example, in the fused deposition modeling (FDM) method, which is one of the material jetting methods, thermoplastic resin melted at high temperature is output from the nozzle of a 3D printer and layered one by one to form the shell 11. Examples of thermoplastic resin include, but are not limited to, polyamide, polycarbonate, polyester, ABS resin, epoxy resin, and fluororesin. The movement of the nozzle of the 3D printer is determined based on the three-dimensional data of the shell 11.

[0043] Here, the FDM method can reduce manufacturing costs compared to other molding methods, but since it is a method of laminating molten resin, faults are easily noticeable. In other molding methods, since the molding material is laminated, faults are formed and the texture is reduced, but the texture is reduced. Therefore, in order to improve the texture of the cranial shape correction helmet 10, it is necessary to polish the outer surface 111 of the shell 11 after the molding process using a 3D printer.

[0044] According to this embodiment, projections and recesses extending in the shell circumferential direction are alternately formed in the stacking direction, so that stacking marks on shell 11 can be made less noticeable and good texture can be obtained without polishing outer surface 111. Since the polishing step of shell 11 can be omitted, the manufacturing cost of shell 11 can be reduced while maintaining good texture.

[0045] Next, a modified example of uneven portion 30 of shell 11 will be described with reference to Fig. 10. Fig. 10 is a front view showing uneven portion 30A formed on outer surface 111 of shell 11.

[0046] The uneven portion 30A is formed on the outer surfaces 111 of the multiple shells 11, and multiple protrusions (raised portions) 31A are arranged continuously. The multiple protrusions 31A protrude from the flat outer surface 111 radially outward of the shell 11 and are arranged at predetermined intervals. The shape of the protrusions 31A is not particularly limited, and may be a cylinder, a cone, a semicircle, a polygonal column, or a polygonal pyramid.

[0047] The protrusions 31A and the low regions, which are the portions of the outer surface 111 where the protrusions 31A are not formed, are arranged alternately and continuously in an arbitrary direction. For example, as shown in Fig. 10, the protrusions 31A and the low regions are arranged alternately and continuously in the direction of the two-dot chain line L.

[0048] The cranial shape correcting helmet 10 according to the embodiment described above provides the following effects.

[0049] (1) The cranial shape correction helmet 10 is a cranial shape correction helmet 10 that is placed on the head 2 to correct cranial deformation, and comprises a substantially annular shell 11 having an upper opening 12 and a lower opening 13. The shell 11 has uneven portions 30, 30A formed on its outer surface 111, in which a plurality of protrusions 31 and convex portions 31A are arranged in succession.

[0050] Here, by polishing the shell 11 after the molding process using a 3D printer or the like, stacking marks and the like can be removed to make the outer surface 111 smoother, but on the other hand, the shell 11 becomes slippery when held in the hand, and the cranial shape correction helmet 10 may fall and be damaged. In particular, infants and small children who are the subjects 1 who wear the cranial shape correction helmet 10 tend to sweat relatively a lot, and the outer surface 111 of the shell 11 of the cranial shape correction helmet 10 when removed from the subject 1 may become even more slippery due to sweat, etc.

[0051] According to this embodiment, a continuous uneven pattern is formed on the outer surface 111 of the shell 11, so that a good texture can be obtained without polishing the shell 11, and the hand is less likely to slip when the shell 11 is held. Therefore, the cranial shape corrective helmet 10 can be prevented from falling when the shell 11 is held, while maintaining the texture of the shell 11. In addition, since the polishing process of the shell 11 can be omitted, the manufacturing cost can be reduced while maintaining the texture of the shell 11.

[0052] (2) In the cranial shape correcting helmet 10 described in (1), the shell 11 is formed by stacking molding material, and the uneven portion 30 has a protrusion portion 31 as a raised portion extending in a direction perpendicular to the stacking direction of the molding material on the outer surface 111 of the shell 11, and a groove portion 32 extending in a direction perpendicular to the stacking direction on the outer surface 111 of the shell 11, and the protrusion portion 31 and the groove portion 32 are arranged alternately in the stacking direction.

[0053] As a result, the protrusions 31 and grooves 32 extending circumferentially around the shell are formed alternately in the stacking direction, making it possible to make the stacking marks on the shell 11 less noticeable and ensuring a good texture without polishing the outer surface 111.

[0054] (3) In the cranial shape correcting helmet 10 described in (2), the distance d2 between the top 311 of the protrusion 31 in the thickness direction of the shell 11 and the bottom 321 of the groove 32 adjacent to the protrusion 31 is 0.05 mm to 1.0 mm.

[0055] This further improves the texture and design.

[0056] (4) In the cranial shape correcting helmet 10 according to any one of (1) to (3), the shell 11 has a flat inner surface 112.

[0057] This allows the cushion to be attached to the inner surface 112 more easily and securely.

[0058] (5) In the cranial shape correcting helmet 10 described in any one of (1) to (4), the shell 11 has a plurality of ventilation holes 17 penetrating in its thickness direction, and the plurality of ventilation holes 17 are formed so that their diameters become smaller from the inner surface 112 to the outer surface 111 of the shell 11.

[0059] This allows the opening area of ​​ventilation holes 17 formed on outer surface 111 to be reduced while the ventilation holes 17 are enlarged, thereby improving the breathability of shell 11 while maintaining the texture of outer surface 111, and enabling shell 11 to be made lighter.

[0060] In the cranial shape correcting helmet 10 described in (6)(5), the shell 11 has a plurality of palpation holes 18 that penetrate in its thickness direction, have an opening diameter larger than that of the air vent 17, and are used for palpation of the head 2, and an uneven portion 30 is formed on the inner surface 181 of the palpation holes 18 on the outer surface 111 side of the shell 11.

[0061] This makes it possible to make lamination marks and the like in the palpation hole 18 less noticeable, further improving the texture.

[0062] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and can be modified as appropriate.

[0063] In the above embodiment, the shell 11 was molded from the lower opening 13 side toward the upper opening 12 side, and the stacking direction was approximately the same as the vertical direction, but when the molding material is stacked in the left-right direction to mold the shell 11, the protrusion portion 31 and the groove portion 32 extending in the vertical direction may be formed.

[0064] In the above embodiment, the protrusion portion 31 and the groove portion 32 were formed on the outer surface 111 of the shell 11 so as to extend around the entire circumferential direction of the shell from the first end 21 to the second end 22 of the main portion 14, but they may be formed so as to extend partially around the circumferential direction of the shell.

[0065] In the above embodiment, the outer surface 111 of the connection portion 251 is flat, but the protrusions 31 and the grooves 32 may be formed.

[0066] Also, for example, on the outer surface 111 of the main portion 14, a band-shaped flat portion extending in the circumferential direction of the shell may be formed between different concave and convex portions 30 in the up-down direction.

[0067] Also, for example, the uneven portion 30 may be such that a plurality of protrusions 31 and a plurality of grooves 32 extending in the entire circumferential direction of the shell are alternately and continuously arranged in the vertical direction over the entire outer surface 111 of the shell 11. In other words, the uneven portion 30 may be formed over the entire surface of the shell 11 that is exposed to the outside. This can make the lamination marks less noticeable.

[0068] 10 is configured to include multiple convex portions 31A as multiple raised portions and a portion of outer surface 111 where convex portions 31A are not formed, the concave portion may be configured to include multiple concave portions formed on flat outer surface 111 and a portion of outer surface 111 where the concave portions are not formed. In this case, the flat portion of outer surface 111 where the concave portions are not formed corresponds to the raised portion, and the concave portions correspond to the low region. The concave portions and the portion of outer surface 111 where the concave portions are not formed are arranged alternately and continuously in any direction.

[0069] In this embodiment, the shell 11 is manufactured by, for example, a 3D printer, but the manufacturing method is not limited to this. The shell 11 is a synthetic resin molded body and has a required surface hardness and rigidity. Therefore, in addition to using a 3D printer, the shell 11 can also be molded by cutting a block of synthetic resin. [Explanation of symbols]

[0070] 1. Target Audience 2 heads 10. Cranial Shape Correction Helmets 11. Shell 12 Upper opening 13 Lower opening 30, 30A uneven part 31 Protrusion (raised portion) 31A Convex (raised) part 32 Groove 111 Exterior

Claims

1. A skull shape correction helmet that is worn on the head to correct skull deformation, a generally annular shell having an upper opening and a lower opening; The shell is a cranial shape correcting helmet having an uneven portion formed on its outer surface, in which a plurality of raised portions are arranged continuously.

2. the shell is formed by layering build material; The uneven portion includes a protrusion portion as a raised portion extending in a direction perpendicular to the stacking direction of the molding material on the outer surface of the shell, a groove portion extending in a direction perpendicular to the stacking direction on an outer surface of the shell, The cranial shape correction helmet according to claim 1 , wherein the protrusions and the grooves are arranged alternately in the stacking direction.

3. The cranial shape correction helmet according to claim 2, wherein the distance between the top of the protrusion and the bottom of the groove adjacent to the protrusion in the thickness direction of the shell is 0.05 mm to 1.0 mm.

4. The cranial shape correction helmet according to claim 1 , wherein the shell has a flat inner surface.

5. The shell has a plurality of ventilation holes penetrating in a thickness direction thereof, 2. The cranial shape correction helmet according to claim 1, wherein the plurality of ventilation holes are formed so that their diameters become smaller from the inner surface to the outer surface of the shell.

6. the shell has a plurality of palpation holes penetrating in a thickness direction thereof, the opening diameter of which is larger than that of the air hole, and the palpation holes are used for palpation of the head; The cranial shape correction helmet according to claim 5, wherein the uneven portion is formed on the inner peripheral surface of the shell on the outer surface side of the palpation hole.

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