Internal structure of talar implant

Abstract

An internal structure of a talar implant, according to embodiments of the present invention, comprises: a main body portion forming the exterior and having a spaced formed therein; and a porous portion disposed inside the main body portion and provided to have a plurality of pores so as to support the main body portion. The porous portion comprises: a plurality of first directional structures disposed so as to be spaced apart from each other inside the main body portion and extending in a first extending direction; and a plurality of second directional structures disposed so as to be spaced apart from each other inside the main body portion and extending in a second extending direction different from the first extending direction, wherein the first directional structures and the second directional structures may be connected to each other so as to form the plurality of pores. Accordingly, weight may be minimized, and structural rigidity may be ensured.

Description

Talus implant internal structure

[0001] The present invention relates to an internal structure of a talus implant, and more specifically, to an internal structure of a talus implant comprising a porous structure.

[0002] The talus is a bone that forms part of the ankle joint and is an important bone connecting the surrounding subtalar joint, transverse tarsal joint, and ankle complex. The talus plays a role in supporting the body's weight carried by the leg bones, as well as the impact from daily activities such as walking or running. Furthermore, because it plays a central role in ankle rotation, problems with the talus can significantly impede daily life.

[0003] The talus can be damaged by fractures caused by trauma or diseases such as avascular necrosis, and such a damaged talus may become compressed and collapse due to continuous load. If the talus collapses, joint deformities may occur due to nonunion or malunion, changes in the height of the left and right ankles may result in a difference in leg length, and the pelvis may become misaligned, potentially causing misalignment extending to the lower back. Furthermore, complications such as bone loss and arthritis are reported to have a relatively high incidence.

[0004] To treat such talus deformities, ankle fusion or artificial joint replacement surgery has traditionally been performed. Ankle fusion is a surgery that fuses the talus and calcaneus, but the prognosis is poor because normal ankle rotation becomes impossible after the operation. Artificial joint replacement using a prefabricated device is a surgery in which a prefabricated talus implant is placed in place of the affected talus.

[0005] 3D printers produce products through additive manufacturing rather than subtractive manufacturing, and due to the process characteristics of 3D printers, they can create hollow structures within the product. Creating hollow structures is one of the characteristics of 3D printed products and offers the advantage of producing lighter products compared to subtractive parts. Furthermore, the interior can be configured to have a specific structure rather than simply being empty, and such internal structures can be referred to as porous structures. In this case, the product can be divided into a completely solid region and a region composed of porous structures; the completely solid region is referred to as the inner shell or inner wall, while the region composed of porous structures is referred to as the porous structure region or lattice region.

[0006] Accordingly, research is actively underway on internal structures for talus implants that can secure structural rigidity and minimize weight by using 3D printing to create both solid and porous structures.

[0007] Specifically, active research is being conducted on porous structures with atypical, random structures for the internal framework of talus implants, which further minimize weight, increase structural rigidity, and are more effective at shock absorption.

[0008] Embodiments of the present invention aim to provide an internal structure for a talus implant that can be shaped according to the form of the user's tibia, calcaneus, and navicular bone.

[0009] In addition, embodiments of the present invention aim to provide an internal structure of a talus implant that includes a porous structure to minimize weight and ensure structural rigidity.

[0010] In addition, embodiments of the present invention aim to provide an internal structure for a talus implant that is designed to match the load flow of the actual foot and can better distribute external forces applied to the talus.

[0011] In addition, embodiments of the present invention aim to provide an internal structure for a talus implant that can secure structural rigidity and minimize weight by varying the shape of the porous structure according to the user's body structure.

[0012] According to embodiments of the present invention, the internal structure of a talus implant includes a main body and a porous part, thereby minimizing weight and maximizing structural rigidity.

[0013] Specifically, the device comprises a main body portion that forms an exterior and has a space formed inside, and a porous portion disposed inside the main body portion and configured to have a plurality of voids to support the main body portion. The porous portion comprises a first directional structure that extends in a first extension direction and is spaced apart in a plurality of places inside the main body portion, and a second directional structure that extends in a second extension direction different from the first extension direction and is spaced apart in a plurality of places inside the main body portion. The first directional structure and the second directional structure may be interconnected to form a plurality of voids.

[0014] Additionally, the main body comprises a main body dome portion positioned to face the tibia, a main body anterior portion spaced apart from the main body dome portion and provided to face the navicular bone, and a main body posterior portion spaced apart from the main body anterior portion and provided to face the calcaneus, wherein the first extension direction is provided in a direction from the main body dome portion toward the main body posterior portion, and the second extension direction may be provided in a direction from the main body dome portion toward the main body anterior portion.

[0015] In addition, the porous portion may be provided in multiple numbers and may further include a connecting structure disposed between the voids formed by the first directional structure and the second directional structure.

[0016] In addition, one end of the above connecting structure may be connected to the part where the first directional structure and the second directional structure meet.

[0017] Additionally, a plurality of the first directional structures may be spaced apart by a first predetermined distance (E1), and a plurality of the second directional structures may be spaced apart by a second predetermined distance (E2).

[0018] In addition, the extension length (E3) of the above-mentioned connection structure may be provided as 1.1 to 1.8 times the first predetermined distance (E1).

[0019] In addition, the extension length (E3) of the above-mentioned connection structure may be provided as 1.34 to 1.5 times the first predetermined distance (E1).

[0020] In addition, the first predetermined distance (E1) can be provided in the same way as the second predetermined distance (E2).

[0021] Additionally, the porous portion may include a plurality of pores having random shapes and sizes throughout the interior of the porous portion by means of the first directional structure and the second directional structure. Furthermore, the randomness of the shape and size of the pores inside the porous portion can be maximized by means of the connecting structure. For example, the porous portion may further include a porous connecting portion connected to the inner surface of the main body and a porous extension portion extending from the porous connecting portion toward the center of the main body, wherein the porous connecting portion is provided with zero pores, and the porous extension portion may be provided such that the pores become larger as they move toward the center of the main body.

[0022] In addition, the first directional structure, the second directional structure, and the connecting structure form the porous extension portion, and the density of the connecting structure may be lowered as it moves from the porous connecting portion toward the center of the main body portion, so that the pores of the porous extension portion become larger as they move toward the center of the main body portion.

[0023] Embodiments of the present invention can provide an internal structure for a talus implant that can set its shape according to the shape of the user's tibia, calcaneus, and navicular bone.

[0024] In addition, embodiments of the present invention may provide an internal structure of a talus implant that includes a porous structure to minimize weight and ensure structural rigidity.

[0025] In addition, embodiments of the present invention can provide an internal structure for a talus implant that is designed to match the load flow of the actual foot and can better distribute the external force applied to the talus.

[0026] In addition, embodiments of the present invention can provide an internal structure for a talus implant that can secure structural rigidity and minimize weight by varying the shape of the porous structure according to the user's body structure.

[0027] FIG. 1 is a diagram showing the arrangement of an internal structure of a talus implant, tibia, navicular bone, and calcaneus according to one embodiment of the present invention.

[0028] FIG. 2 is a drawing showing the directional structure of an internal structure of a talus implant according to one embodiment of the present invention.

[0029] FIG. 3 is a cross-sectional view of the porous portion of an internal structure of a talus implant according to one embodiment of the present invention.

[0030] FIG. 4 is a drawing showing a first directional structure, a second directional structure, and a connecting structure according to an embodiment of the present invention.

[0031] FIG. 5 is a drawing showing a porous connecting part and a porous extension part according to one embodiment of the present invention.

[0032] FIG. 6 is a cross-sectional view of a porous connecting part and a porous extension part according to one embodiment of the present invention.

[0033] Below, embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention.

[0034] However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly explain the invention in the drawings, parts unrelated to the description have been omitted, and similar parts throughout the specification have been given similar reference numerals.

[0035] In this specification, redundant descriptions of identical components are omitted.

[0036] Furthermore, when a component is described in this specification as being 'connected' or 'connected' to another component, it should be understood that it may be directly connected to or connected to the other component, or that there may be other components in between. On the other hand, when a component is described in this specification as being 'directly connected' or 'directly connected' to another component, it should be understood that there are no other components in between.

[0037] Furthermore, the terms used in this specification are used merely to describe specific embodiments and are not intended to limit the invention.

[0038] Additionally, in this specification, singular expressions may include plural expressions unless the context clearly indicates otherwise.

[0039] Furthermore, in this specification, terms such as 'comprising' or 'having' are intended merely to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not excluding in advance the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0040] Additionally, in this specification, the term "and / or" includes a combination of the plurality of described items or any of the plurality of described items. In this specification, "A or B" may include "A," "B," or "both A and B."

[0041] FIG. 1 is a drawing showing the arrangement of an internal structure of a talus implant, tibia, scaphoid, and calcaneus according to one embodiment of the present invention. FIG. 2 is a drawing showing the directional structure of an internal structure of a talus implant according to one embodiment of the present invention. FIG. 1 and FIG. 2 are drawings shown with the left and right directions reversed.

[0042] Specifically, FIG. 2(a) shows the first directional structure of the internal structure of the talus implant, and FIG. 2(b) shows the second directional structure of the internal structure of the talus implant.

[0043] Referring to FIGS. 1 and 2, an internal structure (S) of a talus implant according to one embodiment of the present invention may include a main body (1) and a porous part (3). The main body (1) forms an exterior and may have a space formed inside. That is, the main body (1) may have a porous part (3) disposed inside and may be positioned to face the tibia (G), navicular bone (J), and calcaneus (E). Additionally, the main body (1) may be formed as a shell structure in which a space is formed inside.

[0044] The porous part (3) is positioned inside the main body (1) and is provided to have a plurality of voids (F) to support the main body (1). That is, the porous part (3) is positioned inside the main body (1) so that when inserted into the user's body, the talus implant internal structure (S) comes into contact with the tibia (G), navicular bone (J), and calcaneus (E) described later, effectively dispersing the external force when an external force is applied, thereby ensuring maximum structural safety.

[0045] In addition, the porous part (3) is provided to have multiple pores, thereby maximizing structural rigidity while making the product as lightweight as possible, which can maximize user convenience.

[0046] Furthermore, the porous part (3) may be provided with different pore sizes depending on the position in which it is placed inside the main body part (1). That is, the porous part (3) may be provided with different densities depending on the user's body structure and external force, so that the external force applied to the talus can be better dispersed.

[0047] Meanwhile, in the past, ankle fusion surgery or artificial joint replacement surgery has been performed for treatment. Ankle fusion surgery is a procedure to fuse the talus and calcaneus (E), and problems such as the inability to rotate the ankle normally may occur after the surgery.

[0048] Furthermore, for artificial joint replacement surgery, a prefabricated talus implant was placed to replace the problematic talus. Since prefabricated talus implants have fixed shapes and sizes, and the shape and size of the affected area vary by user, the joint area surrounding the talus had to be trimmed to fit the shape of the prefabricated implant in order to enable joint movement.

[0049] In addition, prefabricated talus implants are often implanted together with prefabricated tibial implants and an insert that acts as cartilage between the talus and tibial implants. In such cases, since the shape and size of the three components are fixed, it may be necessary to remove a portion of the articular section of the tibia to implant the product.

[0050] Furthermore, commercial talus implants use a cobalt-chrome alloy with excellent wear resistance because significant friction is generated by continuous joint movement; however, since the cobalt-chrome alloy is heavy, the prognosis may be poor due to the weight difference between the left and right ankles.

[0051] In contrast, the talus implant internal structure (S) according to one embodiment of the present invention can be manufactured using a 3D printer. That is, the talus implant internal structure (S) can easily create a main body (1), which is a hollow structure with an empty interior, through additive manufacturing by 3D printing rather than subtractive manufacturing. Additionally, the porous part (3) placed inside the main body (1) can also be easily created. Accordingly, the talus implant internal structure (S) according to one embodiment of the present invention can easily secure both structural rigidity and lightweighting as described above. Furthermore, unlike commercial products, the talus implant internal structure (S) can be designed to suit the user's affected area using a 3D printer, thereby creating a talus implant internal structure (S) of a different shape for each user.

[0052] Meanwhile, the porous part (3) may include a first directional structure (35) and a second directional structure (37). The first directional structure (35) is spaced apart in multiple places inside the main body part (1) and may extend in a first extension direction (L1). The second directional structure (37) is spaced apart in multiple places inside the main body part (1) and may extend in a second extension direction (L2) different from the first extension direction.

[0053] Additionally, the first directional structure (35) and the second directional structure (37) can be interconnected to form multiple voids. That is, the first directional structure (35) and the second directional structure (37) can be extended and connected in multiple directions to form a composite structure such as a mesh. Accordingly, the weight of the internal structure (S) of the talus implant can be minimized, and structural stability can be maximized.

[0054] In other words, the talus implant internal structure (S) according to one embodiment of the present invention has a specific directionality, which can be determined by an external force generated according to the anatomical characteristics of the talus implant internal structure (S). That is, the directionality of the first directional structure (35) and the second directional structure (37) can be determined by an external force generated according to the anatomical characteristics.

[0055] Specifically, the orientation of the first directional structure (35) and the second directional structure (37) can be determined according to the relationship between the articular surfaces of the tibia (G) and the calcaneus (E), and between the tibia (G) and the navicular bone (J). That is, the orientation of the first directional structure (35) and the second directional structure (37) can be determined according to the correlation between the spacing and position of each joint. In addition, the angle of the first directional structure (35) and the second directional structure (37) can be determined along with the orientation of the first directional structure (35) and the second directional structure (37).

[0056] Additionally, the number of the first directional structure (35) and the second directional structure (37) may be determined according to the number of pores, the shape of the pores, and the size of the pores determined according to the physical structure characteristics of the user. The directionality of the first directional structure (35) and the second directional structure (37) described above may refer to the first extension direction and the second extension direction.

[0057] Meanwhile, the main body (1) may include a main body dome (11), a main body front part (13), and a main body rear part (15). The main body dome (11) may be positioned to face the tibia. Additionally, the main body dome (11) may be formed curved to correspond to the tibia (G) so that the tibia (G) interlocks with it. That is, the main body dome (11) may be provided with various shapes depending on the shape of the user's tibia (G).

[0058] The front part of the main body (13) is spaced apart from the main body dome part (11) and may be provided to face the navicular bone. Additionally, the front part of the main body (13) may be formed curved to correspond to the navicular bone (J) so as to interlock with the navicular bone (J). That is, the front part of the main body (13) may be provided with various shapes depending on the shape of the user's navicular bone (J).

[0059] The rear part (15) of the main body is spaced apart from the front part (13) of the main body and may be provided to face the calcaneus (E). Additionally, the rear part (15) of the main body may be formed curved to correspond to the calcaneus (E) so as to interlock with the calcaneus (E). That is, the rear part (15) of the main body may be provided with various shapes depending on the shape of the user's calcaneus (E).

[0060] When an external impact is applied through the tibia (G), part of the impact is distributed from the main body dome (11) along the main body anterior part (13) to the navicular bone (J), and another part of the impact can be distributed from the main body dome (11) along the main body posterior part (15) to the calcaneus (E).

[0061] FIG. 3 is a cross-sectional view of a porous portion of an internal structure of a talus implant according to one embodiment of the present invention. FIG. 4 is a drawing showing a first directional structure, a second directional structure, and a connecting structure according to one embodiment of the present invention.

[0062] Referring to FIGS. 3 and 4, the first extension direction (L1) may be provided in a direction from the main body dome portion (11) toward the main body rear portion (15). That is, the first direction structure (35) may be extended diagonally from the main body dome portion (11) toward the main body rear portion (15).

[0063] As described above, the direction and angle of the first directional structure (35) can be determined from the main body dome portion (11) toward the main body rear portion (15). Specifically, one of the plurality of first directional structures (35) may extend from the center of the main body dome portion (11) toward the center of the main body rear portion (15), and the others may be arranged at regular intervals based on this.

[0064] The direction and angle of the first directional structure (35) from the main body dome portion (11) toward the main body rear portion (15) can be determined according to the shape and positional relationship of the tibia (G), calcaneus (E), and navicular bone (J).

[0065] The second extension direction may be provided in a direction from the main body dome portion (11) toward the main body front portion (13). That is, the second direction structure (37) may be extended diagonally from the main body dome portion (11) toward the main body front portion (13).

[0066] As described above, the direction and angle of the second direction structure (37) can be determined from the main body dome portion (11) toward the main body front portion (13). Specifically, one of the plurality of second direction structures (37) may extend from the center of the main body dome portion (11) toward the center of the main body front portion (13), and the others may be arranged at regular intervals based on this.

[0067] The direction and angle of the second directional structure (37) from the main body dome part (11) toward the main body front part (13) can be determined according to the shape and positional relationship of the tibia (G), calcaneus (E), and navicular bone (J).

[0068] As the direction and angle of the first directional structure (35) and the second directional structure (37) are determined according to the shape and positional relationship of the tibia (G), calcaneus (E), and navicular bone (J), the size of the gap formed by the first directional structure (35) and the second directional structure (37) can be determined according to the shape and positional relationship of the tibia (G), calcaneus (E), and navicular bone (J).

[0069] A plurality of first directional structures (35) and a plurality of second directional structures (37) are connected, and different randomly shaped polygons can form voids, and such a structure is similar to the process of cell division and can be similar to a cancellous bone structure. Accordingly, the internal structure (S) of the talus implant can effectively perform load distribution.

[0070] Specifically, a cross-section of the internal region of the talus implant internal structure (S) is obtained according to the direction and spacing of a plurality of first-direction structures (35) and a plurality of second-direction structures (37), and the region can be primarily divided to be as close as possible to an equilateral triangle. Then, perpendicular bisectors are generated for each side of the triangles thus created, and new region division can be performed by intersecting these perpendicular bisectors. Accordingly, a porous part (3) can be formed by forming polygons of different random shapes. This may be similar to the principle of creating a Voronoi diagram.

[0071] Meanwhile, the porous part (3) may include a connecting structure (39). The connecting structure (39) may be provided in multiple numbers and may be placed between the gaps formed by the first directional structure (35) and the second directional structure (37). That is, the connecting structure (39) may be provided between the first directional structure (35) and the second directional structure (37) to improve overall structural safety.

[0072] As multiple first-directional structures (35) and multiple second-directional structures (37) are created at regular intervals, the connectivity between the first-directional structures (35) and the second-directional structures (37) may be reduced. The connecting structure (39) can ensure the continuity of the first-directional structures (35) and the second-directional structures (37), and ensure smoother load distribution and structural rigidity.

[0073] Meanwhile, one end of the connecting structure (39) can be connected to the part where the first direction structure (35) and the second direction structure (37) meet. Accordingly, the connecting structure (39) can effectively improve structural safety.

[0074] Additionally, the connecting structure (39) may be connected at one end to the part where the first directional structure (35) and the second directional structure (37) meet, or connected to the first directional structure (35) or the second directional structure (37). Accordingly, the connecting structure (39) can more effectively improve structural safety.

[0075] The connecting structure (39) can be extended to a certain length to prevent the formation of an indiscriminately large number of connecting structures (39). That is, the connecting structure (39) can be provided to be greater than the distance between multiple first directional structures (35) and shorter than a specific length. Additionally, the connecting structure (39) can be provided to be greater than the distance between multiple second directional structures (37) and shorter than a specific length.

[0076] Specifically, a plurality of first directional structures (35) may be spaced apart by a first predetermined distance (E1), and a plurality of second directional structures (37) may be spaced apart by a second predetermined distance (E2). Accordingly, the plurality of first directional structures (35) and the plurality of second directional structures (37) form a plurality of voids to minimize weight and maximize structural safety. The first predetermined distance (E1) and the second predetermined distance (E2) may be determined by considering the shape and size of the cross-section of the internal structure (S) of the talus implant facing the navicular bone (J), calcaneus (E), and tibia (G).

[0077] Additionally, the extension length (E3) of the connecting structure (39) may be provided as 1.1 to 1.8 times the first predetermined distance (E1). Accordingly, the connecting structure (39) can effectively connect between a plurality of first directional structures (35) and a plurality of second directional structures (37), thereby improving structural safety and preventing the indiscriminate formation of the number of connecting structures (39). The extension length (E3) may be determined by considering the shape and size of the cross-section of the talus implant internal structure (S) facing the navicular bone (J), calcaneus (E), and tibia (G), the first predetermined distance (E1), and the second predetermined distance (E2), etc.

[0078] Specifically, the extension length (E3) of the connecting structure (39) may be provided as 1.34 to 1.5 times the first predetermined distance (E1). Accordingly, the connecting structure (39) can more effectively connect between a plurality of first directional structures (35) and a plurality of second directional structures (37) and improve structural safety, and can more effectively prevent the number of connecting structures (39) from being formed indiscriminately.

[0079] For example, if the first predetermined distance (E1) is set to 3mm, the extension length (E3) of the connecting structure (39) can be formed to be 4mm to 4.5mm. Additionally, the extension length (E3) of the connecting structure (39) may be set based on the second predetermined distance (E2) rather than the first predetermined distance (E1). Specifically, if the first predetermined distance (E1) and the second predetermined distance (E2) are different, the extension length (E3) may be determined based on the smaller distance.

[0080] Meanwhile, the first predetermined distance (E1) can be provided in the same way as the second predetermined distance (E2). Accordingly, the first directional structure (35) and the second directional structure (37) can effectively form a gap and stably support the main body (1).

[0081] However, as described above, the first predetermined distance (E1) and the second predetermined distance (E2) can be formed to suit the user by considering the shape and size of the cross-section of the internal structure (S) of the talus implant facing the navicular bone (J), calcaneus (E), and tibia (G).

[0082] Meanwhile, the number (density) of connecting structures (39) provided according to the location inside the porous part (3) is randomly set, so the porous part (3) may include multiple pores of random shape and random size overall.

[0083] Specifically, the number (density) of connecting structures (39) provided with respect to the center of the main body (1) can be varied to adjust the size of the void. For example, the number of connecting structures (39) in the porous part (3) decreases as it moves from the outside toward the center of the main body (1), so that the size of the void can increase as it moves from the outside toward the center of the main body (1).

[0084] That is, the porous portion (3) can have larger pores as it moves from the outer side in contact with the main body (1) toward the inner side. Accordingly, the porous portion (3) is formed densely from the inner side of the main body (1) in contact with the tibia (G), navicular bone (J), and calcaneus (E), thereby maximizing both lightweighting and structural rigidity.

[0085] In summary, the internal structure (S) of a talus implant according to one embodiment of the present invention has a reduced weight and superior mechanical strength compared to a conventional porous structure having a repetitive, constant pattern such as a lattice structure. For example, if the thickness of the internal shell of a conventional talus implant is 3 mm, the internal structure (S) of a talus implant according to one embodiment of the present invention can have the thickness of the main body part (1), which is the internal shell, reduced and the porous part (3), which is the porous structure, formed, thereby securing both structural rigidity and lightweighting.

[0086] FIG. 5 is a drawing showing a porous connecting part and a porous extension part according to an embodiment of the present invention. FIG. 6 is a cross-sectional view of a porous connecting part and a porous extension part according to an embodiment of the present invention.

[0087] Referring to FIGS. 5 and 6, the porous part (3) may include a plurality of pores having random shapes and random sizes throughout the interior of the porous part (3) by means of a first directional structure (35) and a second directional structure (37). Furthermore, the randomness of the shape and size of the pores inside the porous part (3) can be maximized by means of a connecting structure (39).

[0088] Additionally, the porous part (3) may include a porous connecting part (31) and a porous extension part (33). The porous connecting part (31) is connected to the inner surface of the main body part, and the porous extension part (33) may extend from the porous connecting part (31) toward the center of the main body part (1). Additionally, the porous connecting part (31) may be provided with zero pores, and the porous extension part (33) may be provided such that the pores become larger as they move toward the center of the main body part (1). By determining the thickness of the porous connecting part (31) according to the user's body structure and forming the porous extension part (33), weight can be minimized and structural safety can be maximized. Although the porous connecting part (31) is described separately from the main body part (1), the porous connecting part (31) may refer to the main body part (1) and the thickness of the main body part (1) can be adjusted.

[0089] That is, the porous connecting part (31) extends from the inner side of the main body (1) toward the center of the main body (1) and can be extended with a density of 100%. Accordingly, the porous connecting part (31) can effectively absorb and disperse shocks applied from the outside together with the main body (1).

[0090] The porous extension part (33) is provided with a larger void than the porous connection part (31), and the void may be provided such that it becomes larger as it moves from the porous connection part (31) toward the center of the main body part (1). Accordingly, the porous extension part (33) can lighten the weight of the entire internal structure (S) of the talus implant and, together with the main body part (1) and the porous connection part (31), effectively absorb and disperse shock.

[0091] Meanwhile, the first directional structure (35), the second directional structure (37), and the connecting structure (39) can form a porous extension part (33). That is, the porous extension part (33) may include the first directional structure (35), the second directional structure (37), and the connecting structure (39).

[0092] In addition, as described above, the density of the connecting structure (39) may be lowered as it moves from the porous connecting part (31) toward the center of the main body (1), so that the pores of the porous extension part (33) become larger as they move toward the center of the main body (1).

[0093] That is, the porous extension part (33) may have different sizes of pores depending on the spacing between multiple first directional structures (35), the spacing between multiple second directional structures (37), and the arrangement and number of connecting structures (39).

[0094]

[0095] The size of the void may refer to the size of the inscribed circle of the porous extension (33), and this may vary depending on the spacing between the plurality of first directional structures (35), the spacing between the plurality of second directional structures (37), and the arrangement and number of connecting structures (39). That is, even if the porous extension (33) has the same shape, the size of the void may vary depending on whether the thickness of the porous extension (33) is thin or thick.

[0096] According to one embodiment of the present invention, the internal structure (S) of a talus implant can be manufactured more efficiently by varying the size of the pores of the porous extension part (33) according to the magnitude of the load applied to the patient. In addition, as the size of the pores is adjusted, the weight of the product can ultimately be controlled to compensate for weight issues and create an efficient product.

[0097] Meanwhile, the first directional structure (35) and the second directional structure (37) may form a predetermined angle (θ1). The predetermined angle (θ1) may be provided between 60 and 88 degrees to stably form a void and improve structural safety. Specifically, the predetermined angle (θ1) may be provided between 70 and 80 degrees to stably form a void and further improve structural safety. However, the predetermined angle (θ1) may be determined by considering the shape and size of the cross-section of the internal structure (S) of the talus implant facing the user's navicular bone (J), calcaneus (E), and tibia (G), the thickness of the first directional structure (35), and the thickness of the second directional structure (37).

[0098] Meanwhile, referring again to FIG. 6, as described above, the thickness of the porous connecting part (31) is determined according to the user's body structure, and the porous extension part (33) is formed to minimize weight and maximize structural safety. Although the porous connecting part (31) is described separately from the main body part (1), the porous connecting part (31) may be the main body part (1) and may mean that the thickness of the main body part (1) is adjusted.

[0099] Although it varies depending on the user's body structure, the average thickness (t1) of the main body (1) can typically be provided as 0.9 to 1.1 of the average thickness (t2) of the porous connection part (31). That is, the average thickness (t1) of the main body (1) is provided as 0.9 to 1.1 of the average thickness (t2) of the porous connection part (31), thereby maximizing the structural rigidity of the entire internal structure (S) of the talus implant, maintaining the structural rigidity of the internal structure (S) of the talus implant through the porous extension part (33) in which the void is formed, and minimizing the weight.

[0100] For example, the average thickness (t1) of the main body (1) and the average thickness (t2) of the porous connection part (31) can be provided equally. Accordingly, the structural rigidity of the entire internal structure (S) of the talus implant can be maximized, and the structural rigidity of the internal structure (S) of the talus implant can be maintained through the porous extension part (33) in which the void is formed, while minimizing the weight. In addition, the manufacturing of the internal structure (S) of the talus implant can be easily performed.

[0101] However, the average thickness (t1) of the main body (1) and the average thickness (t2) of the porous connecting part (31) are not limited to the above-described contents and can be set in various ways considering the user's physical structure, including the size and shape of the user's navicular bone, calcaneus (E) and tibia (G).

[0102] Although representative embodiments of the present invention have been described in detail above, those skilled in the art will understand that various modifications can be made to the above-described embodiments without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims set forth below as well as equivalents thereof.

Claims

1. A main body part that forms an exterior and has a space formed inside; and A porous part disposed inside the main body and configured to have a plurality of voids to support the main body; comprising The above porous part A plurality of first directional structures spaced apart and extending in a first extension direction, and a plurality of structures spaced apart and arranged inside the main body; and It includes a plurality of second direction structures spaced apart and arranged inside the main body, extending in a second extension direction different from the first extension direction; A talus implant internal structure characterized in that the first directional structure and the second directional structure are interconnected to form a plurality of voids.

2. In Paragraph 1, The above main body Main body dome portion positioned to face the tibia; A front part of the main body spaced apart from the above main body dome part and configured to face the scaphoid bone; and It includes a rear part of the main body that is spaced apart from the front part of the main body and is configured to face the calcaneus; The above first extension direction is provided in a direction from the main body dome portion toward the main body rear portion, and A talus implant internal structure characterized in that the second extension direction is provided in a direction from the main body dome portion toward the main body front portion.

3. In Paragraph 2, The above porous part A talus implant internal structure characterized by further comprising a connecting structure disposed between the gap formed by the first directional structure and the second directional structure, provided in a plurality.

4. In Paragraph 3, The above connection structure A talus implant internal structure characterized by the fact that one end is connected to the part where the first directional structure and the second directional structure meet.

5. In Paragraph 4, A talus implant internal structure characterized in that a plurality of the first directional structures are spaced apart by a first predetermined distance (E1), and a plurality of the second directional structures are spaced apart by a second predetermined distance (E2).

6. In Paragraph 5, A talus implant internal structure characterized in that the extension length (E3) of the above-mentioned connecting structure is provided as 1.1 to 1.8 times the first predetermined distance (E1).

7. In Paragraph 6, A talus implant internal structure characterized in that the extension length (E3) of the above-mentioned connecting structure is provided to be 1.34 to 1.5 times the first predetermined distance (E1).

8. In Paragraph 7, The internal structure of a talus implant, characterized in that the first predetermined distance (E1) is provided in the same way as the second predetermined distance (E2).

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