Talus artificial joint type cement cage

Abstract

A talar artificial joint-type cement cage according to embodiments of the present invention comprises an input portion having a plurality of voids formed therein, a plurality of joint portions provided and connected to the input portion and arranged to face an adjacent joint, and a cement disposed in a space formed inside the input portion and the joint portion to supply a drug to the outside through the input portion, wherein the joint portion may be provided as a closed surface. By doing so, the drug can be effectively supplied through the antibiotic cement, and thermal damage to the adjacent joint can be minimized.

Description

Technology Field

[0001] The present invention relates to a talus artificial joint type cement cage, and more specifically, to a talus artificial joint type cement cage in which a space is formed inside to facilitate cement placement. Background Technology

[0002] Osteomyelitis caused by bacterial or other infections in the bone marrow is a disease that requires multiple surgeries and medication over a long period and is difficult to cure. Although inflamed and necrotic areas within the bone are surgically scraped away (curettage), it is impossible to surgically completely remove bacteria that have infiltrated the bone and surrounding soft tissues.

[0003] Accordingly, additional antibiotics are required for a certain period (at least 6 weeks) after surgery. Since antibiotics are not effectively delivered into the bone even when administered intravenously, antibiotics must be mixed with bone cement and inserted into the dead space created after curettage to induce local antibiotic release.

[0004] After the inflammation completely subsides, the usual treatment method for osteomyelitis is to remove the bone cement through a second surgery and reconstruct the empty space through bone grafting.

[0005] Meanwhile, the talus of the ankle is a small bone with more than 60% of its surface consisting of articular surfaces. If osteomyelitis occurs throughout the entire talus, the entire talus is removed and the empty space is filled with talus-shaped antibiotic-containing bone cement.

[0006] In this case, direct damage caused by heat generated during the cement hardening process and subsequent severe damage to adjacent joint cartilage caused by the rough cement surface during the process of moving, stepping, and walking the joint occur.

[0007] If severe damage to the articular cartilage occurs, joint salvage is impossible even after the inflammation subsides; therefore, antibiotic cement is removed and bone grafting and arthrodesis are performed upon the subsidence of inflammation. In this case, the tibia, calcaneus, and navicular bone must all be fused, and thus, movement of the ankle joint may be completely lost.

[0008] Accordingly, there is an increasing demand for artificial joint cages that allow for the insertion of local antibiotic cement for the treatment of osteomyelitis while preventing damage to surrounding articular cartilage caused by thermal damage and direct contact with the cement. Through this, research is also actively underway on methods that can maintain the normal shape of the ankle joint until joint inflammation subsides, preserve movement to prevent joint stiffness, and prevent damage to surrounding cartilage, thereby facilitating secondary joint salvage surgery. The problem to be solved

[0009] Embodiments of the present invention aim to provide a talus artificial joint type cement cage capable of inserting a local antibiotic cement while minimizing thermal damage.

[0010] In addition, embodiments of the present invention aim to provide a talus artificial joint type cement cage capable of preventing damage to surrounding articular cartilage caused by direct contact with cement.

[0011] In addition, embodiments of the present invention aim to provide a talus artificial joint type cement cage capable of maintaining the normal shape of the ankle joint and preserving movement so as not to stiffen the joint until joint inflammation subsides.

[0012] In addition, embodiments of the present invention aim to provide a talus artificial joint type cement cage that prevents damage to surrounding cartilage, thereby enabling easy secondary arthrodesis. means of solving the problem

[0013] According to embodiments of the present invention, a talus artificial joint type cement cage includes an inlet section having a plurality of voids and a joint section positioned to face an adjacent joint, so that antibiotic cement is stably placed inside to effectively deliver drugs and minimize damage to the adjacent joint.

[0014] Specifically, the apparatus includes an input section in which a plurality of voids are formed, a joint section provided in a plurality and connected to the input section and arranged to face an adjacent joint, and a cement disposed in a space formed inside the input section and the joint section to supply a drug to the outside through the input section, wherein the joint section may be provided as a closed surface.

[0015] In addition, the above input part may be formed into a net structure.

[0016] In addition, the above-mentioned input portion is connected to the above-mentioned joint portion and may include an input outer portion forming an outer portion and an input discharge portion formed by penetrating the input outer portion in multiple places to discharge a drug.

[0017] In addition, the cross-sectional area (W1) of the joint portion may be 1.2 to 1.8 times the cross-sectional area (W2) of the input portion.

[0018] In addition, the cross-sectional area (W2a) of the input / output section may be larger than the cross-sectional area (W2b) of the input / output section.

[0019] In addition, the above-mentioned external portion may include an external connecting portion connecting a plurality of the above-mentioned joint portions and an external rigidity portion provided in a plurality on the external connecting portion to reinforce the rigidity of the external connecting portion.

[0020] In addition, the above-mentioned external portion may further include an external auxiliary portion connecting the rear surface of the joint portion and the rear surface of the external connecting portion, and an external reinforcing portion protruding from the rear surface of the external rigidity portion and the external connecting portion.

[0021] In addition, the protrusion height (H1) of the exterior support part may be 1.1 to 1.3 times the protrusion height (H2) of the exterior reinforcement part.

[0022] Additionally, the device further includes a support member positioned inside the input portion and the joint portion and connecting a plurality of the joint portions, wherein the joint portion includes a tibial joint portion positioned to face the tibia, a calcaneal joint portion positioned to face the calcaneus, and a navicular joint portion positioned to face the navicular bone, and the support member may include a tibial-calcaneal support member connecting the tibial joint portion and the calcaneal joint portion, and a tibial-calcaneal support member connecting the tibial joint portion and the navicular joint portion.

[0023] In addition, the support member may further include a main-to-longitudinal support member connecting the calcaneal joint portion and the navicular joint portion.

[0024] Additionally, the device further includes a retaining member provided on the inner side of the joint portion to maintain the position of the cement, wherein the retaining member may include a retaining main body portion protruding from the rear surface of the joint portion, a retaining indentation portion formed outwardly from the rear surface of the joint portion and connected to the retaining main body portion, a retaining auxiliary portion protruding from the rear surface of the joint portion and positioned to face the retaining main body portion, and a retaining protrusion portion protruding from the end of the retaining main body portion. Effects of the invention

[0025] Embodiments of the present invention can provide a talus artificial joint type cement cage in which a local antibiotic cement is inserted while minimizing thermal damage.

[0026] In addition, embodiments of the present invention can provide a talus artificial joint type cement cage that can prevent damage to surrounding articular cartilage caused by direct contact with cement.

[0027] In addition, embodiments of the present invention can provide a talus artificial joint type cement cage that maintains the normal shape of the ankle joint and preserves movement so as not to stiffen the joint until joint inflammation subsides.

[0028] In addition, embodiments of the present invention can provide a talus artificial joint type cement cage that prevents damage to surrounding cartilage, thereby allowing secondary arthrodesis to be easily performed. Brief explanation of the drawing

[0029] FIG. 1 is a diagram showing the arrangement of a talus artificial joint type cement cage, tibia, navicular bone, and calcaneus according to one embodiment of the present invention. FIG. 2 is a drawing showing a talus artificial joint type cement cage according to one embodiment of the present invention. FIG. 3 is a drawing showing cement placed in a talus artificial joint type cement cage according to one embodiment of the present invention. FIG. 4 is a drawing showing a support portion of a talus artificial joint type cement cage according to one embodiment of the present invention. FIG. 5 is a drawing showing an exterior support part, an exterior reinforcement part, and a retaining part of a talus artificial joint type cement cage according to one embodiment of the present invention. Specific details for implementing the invention

[0030] 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.

[0031] 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.

[0032] In this specification, redundant descriptions of identical components are omitted.

[0033] 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.

[0034] Furthermore, the terms used in this specification are used merely to describe specific embodiments and are not intended to limit the invention.

[0035] Additionally, in this specification, singular expressions may include plural expressions unless the context clearly indicates otherwise.

[0036] 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.

[0037] 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."

[0038] FIG. 1 is a drawing showing the arrangement of a talus artificial joint type cement cage, tibia, navicular bone, and calcaneus according to one embodiment of the present invention. FIG. 2 is a drawing showing a talus artificial joint type cement cage according to one embodiment of the present invention.

[0039] Referring to FIGS. 1 and 2, a talus artificial joint type cement cage (S) according to one embodiment of the present invention may include an input part (1), a joint part (3), and cement (U). A plurality of voids may be formed in the input part (1).

[0040] That is, the input section (1) has a space formed inside where cement (U) is placed, and the drug contained in the cement (U) can be discharged to the outside. The input section (1) minimizes the overall weight, secures structural rigidity above a certain level, and can effectively supply the drug.

[0041] The joint portion (3) is provided in multiple numbers and connected to the input portion (1), and can be arranged to face adjacent joints. That is, the joint portion (3) forms an articular surface and can move by forming an articulation with adjacent joints, namely the tibia (G), navicular bone (J), and calcaneus (E). Additionally, the joint portion (3) can be mirror-finished to the level of an artificial joint.

[0042] The cement (U) is placed in the space formed inside the inlet section (1) and the joint section (3) and can supply medication to the outside through the inlet section (1). That is, the cement (U) is stably placed inside the inlet section (1) and the joint section (3) and can effectively treat inflammation by supplying medication to the outside.

[0043] The joint portion (3) may be provided with a closed surface. Being provided with a closed surface means that, unlike the input portion (1), no through hole is formed and it can move with an adjacent joint.

[0044] The input section (1) may be a part that does not form an articular surface and does not face an adjacent joint. That is, the input section (1) may be formed with a loose mesh structure. Additionally, the input section (1) may have through holes formed with a size greater than a predetermined size to facilitate cement injection and drug release. However, the size of the through holes in the input section (1) may be set so as to maintain structural rigidity.

[0045] In addition, the joint portion (3) forming the joint surface and the mesh-shaped insertion portion (1) are connected so that the overall appearance can be set to a shape similar to the existing talus. The shape of the joint portion (3) and the insertion portion (1) can be determined and the area ratio set by considering the shape of the patient's tibia (G), calcaneus (E), and navicular bone (J).

[0046] That is, the talus artificial joint type cement cage (S) according to one embodiment of the present invention is formed with an optimal shape and area ratio for the user's body structure, so that the patient can be effectively treated.

[0047] FIG. 3 is a drawing showing cement placed in a talus artificial joint type cement cage according to one embodiment of the present invention. Specifically, FIG. 3(a) shows a talus artificial joint type cement cage without cement placed inside, and FIG. 3(b) shows a talus artificial joint type cement cage with cement placed inside.

[0048] Referring to FIG. 3, the input section (1) may include an input outer section (11) and an input discharge section (12). The input outer section (11) is connected to the joint section (3) and can form an outer section. That is, the input outer section (11) can connect a plurality of joint sections (3). In other words, the input outer section (11) is provided with a plurality of thin lines to form a plurality of through holes and can connect a plurality of joint sections (3).

[0049] The injection / discharge section (12) is formed through the injection outer section (11) in multiple places so that the drug can be discharged. That is, the injection / discharge section (12) can provide a path for the drug flowing out from the cement (U) placed inside to be discharged to the outside through a through hole formed by a plurality of thin lines forming a mesh structure at intervals.

[0050] Meanwhile, the cross-sectional area (W1) of the joint portion (3) can be provided to be 1.2 to 1.8 times the cross-sectional area (W2) of the input portion (1). Accordingly, thermal damage caused by movement with adjacent joints can be prevented, and smooth movement can be performed while effectively supplying medication through cement.

[0051] In addition, by designing the optimal cross-sectional area of ​​the joint part (3) and the input part (1), the structural rigidity of the talus artificial joint type cement cage (S) can be maximized, and mobility and drug supply efficiency can be maximized.

[0052] For example, the cross-sectional area (W1) of the joint part (3) may occupy 60% of the total external surface area of ​​the talus artificial joint type cement cage (S), and the cross-sectional area (W2) of the input part (1) may occupy 40%. Accordingly, weight can be minimized, heat damage prevented, and drugs can be supplied effectively.

[0053] The cross-sectional area (W2a) of the input / output section (12) can be provided to be larger than the cross-sectional area (W2b) of the input outer section (11). That is, the cross-sectional area (W2a) of the input / output section (12) into which the drug is introduced is provided to be larger than the cross-sectional area (W2b) of the input outer section (11) which forms a net and maintains its shape, thereby maintaining maximum structural rigidity and effectively supplying the drug from the cement (U).

[0054] Specifically, the cross-sectional area (W2b) of the input outer section (11) can be provided to be 0.6 to 0.9 times the cross-sectional area (W2a) of the input discharge section (12). Accordingly, the structural safety of the entire structure, such as the input section (1) itself and the connection between the input section (1) and the joint section (3), is improved, the position of the cement (U) is stably maintained, and the drug can be supplied to the outside.

[0055] More specifically, the cross-sectional area (W2b) of the input outer section (11) can be provided to be 0.75 to 0.85 times the cross-sectional area (W2a) of the input discharge section (12). Accordingly, the structural safety of the entire structure, such as the input section (1) itself and the connection between the input section (1) and the joint section (3), is further improved, the position of the cement (U) is maintained more stably, and the drug can be supplied to the outside.

[0056] FIG. 4 is a drawing showing a support portion of a talus artificial joint type cement cage according to one embodiment of the present invention. Specifically, FIG. 4(a) is a perspective view of a talus artificial joint type cement cage, and FIG. 4(b) is a schematic diagram of the joint portion and support portion of the talus artificial joint type cement cage.

[0057] FIG. 5 is a drawing showing an external support part, an external reinforcement part, and a retaining part of a talus artificial joint type cement cage according to one embodiment of the present invention. Specifically, FIG. 5(a) shows an external support part of a talus artificial joint type cement cage, FIG. 5(b) shows an external reinforcement part of a talus artificial joint type cement cage, and FIG. 5(c) shows a retaining part of a talus artificial joint type cement cage.

[0058] Referring to FIGS. 4 and 5, the input outer casing (11) may include an outer casing connecting part (111) and an outer casing rigid part (112). The outer casing connecting part (111) may connect between a plurality of joint parts (3). That is, the outer casing connecting part (111) may be provided with a plurality of thin lines to connect between a plurality of joint parts (3) and to form a plurality of gaps.

[0059] The exterior rigidity section (112) can be provided in multiple units on the exterior connection section (111) to reinforce the rigidity of the exterior connection section (111). That is, the exterior rigidity section (112) can be provided at the part where multiple exterior connection sections (111) are connected to reinforce structural rigidity. In addition, the exterior rigidity section (112) can be provided at the part where the exterior connection section (111) and the joint section (3) are connected to reinforce structural rigidity. Specifically, the exterior rigidity section (112) can increase the supporting force and structural rigidity by improving the cross-sectional area of ​​the connected part.

[0060] When the external connection part (111) is formed as thin as possible so that the drug is easily discharged from the cement (U) and the input / output part (12) is formed, the external rigidity part (112) can reinforce structural rigidity to improve overall safety.

[0061] The input exterior part (11) may include an exterior auxiliary part (113) and an exterior reinforcing part (114). The exterior auxiliary part (113) may connect the rear of the joint part (3) and the rear of the exterior connecting part (111). That is, the exterior auxiliary part (113) reinforces the structural rigidity between the exterior connecting part (111) and the joint part (3) to prevent damage as much as possible even if an external impact is applied, and to prevent damage as much as possible when cement (U) is placed inside.

[0062] The exterior reinforcement part (114) may be formed protruding from the rear surface of the exterior rigidity part (112) and the exterior connection part (111). That is, the exterior reinforcement part (114) is provided in the portion where the exterior rigidity part (112) is formed and connected to a plurality of exterior connection parts (111), thereby improving structural safety together with the exterior rigidity part (112).

[0063] Meanwhile, the protrusion height (H1) of the exterior support part (113) can be provided to be 1.1 to 1.3 times the protrusion height (H2) of the exterior reinforcement part (114). That is, the protrusion height of the exterior support part (113) can be provided to be greater than that of the exterior reinforcement part (114) which reinforces structural rigidity together with the exterior rigidity part (112), thereby minimizing the overall weight and improving structural safety.

[0064] Specifically, the protrusion height (H1) of the exterior support part (113) can be provided to be 1.15 to 1.25 times the protrusion height (H2) of the exterior reinforcement part (114). That is, the protrusion height of the exterior support part (113) can be provided to be greater than that of the exterior reinforcement part (114) which reinforces structural rigidity together with the exterior rigidity part (112), thereby minimizing the overall weight and further improving structural safety.

[0065] Meanwhile, a talus joint-type cement cage (S) according to one embodiment of the present invention may include a support member (5). The support member (5) is placed inside the input member (1) and the joint member (3) and can connect between a plurality of joint members (3). That is, the support member (5) can increase structural rigidity and allow cement (U) to be stably placed inside.

[0066] However, the support member (5) can be formed only when structural stability is reduced considering the user's body. That is, when only the joint part (3) and the insertion part (1) are provided and cement (U) is placed inside to sufficiently maintain structural safety, the support member (5) is not formed, thereby minimizing material costs and weight, and ensuring structural rigidity above a certain level.

[0067] The joint portion (3) may include a tibial joint portion (31), a calcaneal joint portion (32), and a navicular joint portion (33). The tibial joint portion (31) may be positioned to face the tibia. The calcaneal joint portion (32) may be positioned to face the calcaneus. The navicular joint portion (33) may be positioned to face the navicular bone.

[0068] The tibial joint portion (31), calcaneal joint portion (32), and navicular joint portion (33) may be spaced apart or connected depending on the situation. This is determined by considering the user's body structure to ensure maximum structural safety and to supply the cement (U) drug to the outside.

[0069] The support portion (5) may include a tibial joint portion (51) and a calcaneal joint portion (52). The tibial joint portion (51) may connect the tibial joint portion (31) and the calcaneal joint portion (32). That is, the tibial joint portion (51) may be formed with a predetermined thickness and extend from the center of the tibial joint portion (31) to the center of the calcaneal joint portion (32).

[0070] The tibial joint portion (52) can connect the tibial joint portion (31) and the navicular joint portion (33). That is, the tibial joint portion (52) is formed with a predetermined thickness and can extend from the center of the tibial joint portion (31) to the center of the navicular joint portion (33).

[0071] The support portion (5) may include a main support portion (53). The main support portion (53) may connect the calcaneal joint portion (32) and the navicular joint portion (33). That is, the main support portion (53) may be formed with a predetermined thickness and extend from the center of the navicular joint portion (33) to the center of the calcaneal joint portion (32).

[0072] Meanwhile, the average thickness (t1) of the light-type support member (51) is provided to be greater than the average thickness (t2) of the race-type support member (52), and the average thickness (t2) of the race-type support member (52) can be provided to be greater than the average thickness (t3) of the main-type support member (53).

[0073] That is, the thickness of the tibial joint portion (31) and the calcaneal joint portion (32), which are formed relatively far apart due to the human body structure, is provided to be the largest, and the thickness of the main joint portion (53), which is formed relatively close to the human body structure, and the thickness of the main joint portion (53), which is formed relatively close to the human body structure, is provided to be the thinnest.

[0074] Specifically, the average thickness (t1) of the light-type support member (51) is provided to be 1.1 to 1.5 times the average thickness (t2) of the race-type support member (52), and the average thickness (t2) of the race-type support member (52) can be provided to be 1.05 to 1.2 times the average thickness (t3) of the main-type support member (53). Accordingly, structural safety can be ensured while minimizing material usage by taking into account the patient's body structure, and the placement of cement (U) can also be performed efficiently.

[0075] More specifically, the average thickness (t1) of the light-type support member (51) is provided to be 1.25 to 1.35 times the average thickness (t2) of the race-type support member (52), and the average thickness (t2) of the race-type support member (52) can be provided to be 1.1 to 1.05 times the average thickness (t3) of the main-type support member (53). Accordingly, considering the patient's body structure, the use of materials is further minimized while structural safety is further secured, and the placement of cement (U) can also be performed more efficiently.

[0076] Referring again to FIG. 5, a talus artificial joint type cement cage (S) according to one embodiment of the present invention may include a retaining part (7).

[0077] The retaining part (7) is provided on the inner side of the joint part (3) to maintain the position of the cement (U). That is, the retaining part (7) is provided in multiple numbers inside the joint part (3) to stably fix the position of the cement (U) so that the drug can be stably discharged to the outside.

[0078] Specifically, the retaining part (7) may include a retaining main body part (71), a retaining indentation part (72), a retaining auxiliary part (73), and a retaining protrusion part (74). The retaining main body part (71) may be formed protruding from the rear surface of the joint part (3). That is, the retaining main body part (71) can be caught and fixed in position when cement (U) is placed inside the input part (1) and the joint part (3).

[0079] The retaining indentation (72) is formed as an indentation outward from the rear of the joint part (3) and can be connected to the retaining main body part (71). That is, the retaining indentation (72) can have a space formed so that cement (U) is placed therein and can be maintained together with the retaining main body part (71).

[0080] The maintenance support part (73) is formed protruding from the rear surface of the joint part (3) and can be positioned to face the maintenance main body part (71). That is, the maintenance support part (73) can more stably fix the position by catching the cement (U) inserted into the maintenance indentation part (72).

[0081] That is, the main body (71), the retaining inlet (72), and the retaining auxiliary part (73) together form a cavity so that the end of the cement (U) is stably positioned and the position of the entire cement (U) can be stably maintained.

[0082] The retaining protrusion (74) can be formed protruding from the end of the retaining main body (71). That is, the retaining protrusion (74) extends from the end of the retaining main body (71) in a direction away from the retaining auxiliary part (73) to provide a multi-faceted structure, which can allow the cement (U) to be fixed more stably.

[0083] 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. Explanation of the symbols

[0084] S: Talus artificial joint type cement cage G: Tibia E: Calcaneus J: navicular bone 1: Input section 3: Joint area 5: Support

Claims

Claim 1 A talus artificial joint type cement cage comprising: an input section in which a plurality of voids are formed; a joint section provided in a plurality and connected to the input section and arranged to face an adjacent joint; and a cement disposed in a space formed inside the input section and the joint section to supply a drug to the outside through the input section; wherein the joint section is provided as a closed surface. Claim 2 A talus artificial joint type cement cage according to claim 1, characterized in that the input portion is formed as a mesh structure. Claim 3 A talus artificial joint type cement cage according to claim 2, characterized in that the input portion is connected to the joint portion and includes an input outer portion forming an outer portion; and an input discharge portion formed by penetrating the input outer portion in multiple places to discharge a drug. Claim 4 A talus artificial joint type cement cage according to claim 3, characterized in that the cross-sectional area (W1) of the joint portion is 1.2 to 1.8 times the cross-sectional area (W2) of the input portion. Claim 5 A talus artificial joint type cement cage characterized in that, in claim 4, the cross-sectional area (W2a) of the input / output section is larger than the cross-sectional area (W2b) of the input / output section. Claim 6 A talus artificial joint type cement cage according to claim 5, characterized in that the above-mentioned external portion comprises: an external connecting portion connecting a plurality of joint portions; and an external rigidity portion provided in a plurality of portions on the external connecting portion to reinforce the rigidity of the external connecting portion. Claim 7 A talus artificial joint type cement cage according to claim 6, further comprising: an external auxiliary part connecting the rear surface of the joint part and the rear surface of the external connecting part; and an external reinforcing part protruding from the rear surface of the external rigidity part and the external connecting part.

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