ARTIFICIAL ARTICULATION HAVING STABLE FIXING MEANS FOR UNICOMPARTMENTAL KNEE ARTHROPLASTY

Abstract

An artificial articulation having stable fixing means for unicompartmental knee arthroplasty is stably attached to the top of a tibia in order to permit a sliding motion of an artificial joint attached to the bottom of a femur. The artificial articulation includes an implant hat part which a curved surface structure that makes surface contact with the artificial joint attached to the bottom of the femur is formed on an upper surface thereof, and protrusions protruding by a predetermined height in a direction of the top of the tibia are formed in large numbers on a lower surface thereof, and a distally extending stem configured to be formed to protrude downward by a predetermined length from the lower surface of the implant hat part, and to be inserted into the tibia by a predetermined depth from the top of the tibia and attached thereto.

Claims

1. An artificial articulation (100) attached to a top of a tibia in order to permit a sliding motion of an artificial joint attached to a bottom of a femur, the artificial articulation (100) comprising: an implant hat part (110) in which a curved surface structure that makes surface contact with the artificial joint attached to the bottom of the femur is formed on an upper surface thereof, and protrusions (111) protruding by a predetermined height in a direction of the top of the tibia are formed in large numbers on a lower surface thereof, and a distally extending stem (120) configured to protrude downward by a predetermined length from the lower surface of the implant hat part (110), and to be inserted into the tibia by a predetermined depth from the top of the tibia and attached thereto, wherein the protrusions (111) formed on the lower surface of the implant hat part (110) are arranged in the large numbers over an area corresponding to a top surface of the tibia, and an arrangement density of the protrusions (111) varies depending on a magnitude and a location of load applied from the artificial joint attached to the bottom of the femur.

2. The artificial articulation of claim 1, wherein the protrusions (111) formed on the lower surface of the implant hat part (110) have pointed needle-like structures so as to be inserted into the tibia by a predetermined depth through the top surface of the tibia.

3. The artificial articulation of claim 1, wherein the protrusions (111) formed on the lower surface of the implant hat part (110) are arranged in the large numbers in a predetermined pattern over the area corresponding to the top surface of the tibia.

4. An artificial articulation (100) attached to a top of a tibia in order to permit a sliding motion of an artificial joint attached to a bottom of a femur, the artificial articulation (100) comprising: an implant hat part (110) in which a curved surface structure that makes surface contact with the artificial joint attached to the bottom of the femur is formed on an upper surface thereof, and protrusions (111) protruding by a predetermined height in a direction of the top of the tibia are formed in large numbers on a lower surface thereof, and a distally extending stem (120) configured to protrude downward by a predetermined length from the lower surface of the implant hat part (110), and to be inserted into the tibia by a predetermined depth from the top of the tibia and attached thereto, wherein the protrusions (111) formed on the lower surface of the implant hat part (110) are arranged in the large numbers over an area corresponding to a top surface of the tibia, and a protruding height of the protrusions (111) varies depending on a magnitude and a location of load applied from the artificial joint attached to the bottom of the femur.

5. The artificial articulation of claim 1, wherein at least one osseointegration hole (112) for inducing osseointegration, after the artificial articulation is mounted on a patient subjected to surgery, is formed on a lower side of the implant hat part (110).

6. The artificial articulation of claim 5, wherein the osseointegration holes (112) are arranged in large numbers in a predetermined pattern along an outer peripheral surface of the lower side of the implant hat part (110).

7. The artificial articulation of claim 5, wherein the osseointegration holes (112) are formed in large numbers along an outer peripheral surface of the lower side of the implant hat part (110), and an arrangement density of the osseointegration holes (112) varies depending on a magnitude and a location of load applied from the artificial joint attached to the bottom of the femur.

8. The artificial articulation of claim 1, wherein the lower surface of the implant hat part (110) has a mesh structure in which a plurality of pores are formed.

9. The artificial articulation of claim 8, wherein an inside of the implant hat part (110) has a hollow structure.

10. The artificial articulation of claim 1, wherein a side surface and the lower surface of the implant hat part (110) have porous structures in which a plurality of pores are formed, and an outer surface of the distally extending stem (120) has a porous structure in which a plurality of pores are formed.

11. The artificial articulation of claim 1, wherein at least one osseointegration hole (112) for inducing osseointegration, after the artificial articulation is mounted on a patient subjected to surgery, is formed on a side surface of the distally extending stem (120).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The above and other objectives, features, and other advantages of the present disclosure will be more clearly understood from the following detailed description when taken in conjunction with the accompanying drawings, in which:

[0037] FIG. 1 is a photograph showing an artificial joint according to the conventional art;

[0038] FIG. 2 is a front view showing an artificial articulation according to an embodiment of the present disclosure;

[0039] FIGS. 3A and 3B are schematic views showing the arrangement of protrusions formed on the lower surface of an implant hat part according to embodiments of the present disclosure;

[0040] FIG. 4 is a perspective view showing an artificial articulation according to another embodiment of the present disclosure;

[0041] FIG. 5 is a vertical cross-sectional view showing the artificial articulation shown in FIG. 4;

[0042] FIG. 6 is a perspective view showing an artificial articulation according to yet another embodiment of the present disclosure; and

[0043] FIG. 7 is a vertical cross-sectional view showing the artificial articulation according to yet to another embodiment of the present disclosure.

DETAILED DESCRIPTION OF THE INVENTION

[0044] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. All terms and words used herein should not be construed as being limited to conventional or dictionary meanings but should be interpreted as meanings and concepts consistent with the technical spirit of the present disclosure.

[0045] Throughout the specification, when a member is referred to be located “on” another member, it should be understood that the member may be in contact with another member, but yet another member may exist in between. Throughout the specification, when a part “comprises” or “includes” a component, it means that other components may be further comprised or included, rather than excluding other components, unless otherwise stated.

[0046] FIG. 2 is a front view showing an artificial articulation according to an embodiment of the present disclosure, and FIGS. 3A and 3B are schematic views showing the arrangement of protrusions formed on the lower surface of an implant hat part according to embodiments of the present disclosure.

[0047] Referring to these drawings, the artificial articulation according to the embodiment is attached to the top of a tibia in order to permit a sliding motion of an artificial joint attached to the bottom of a femur, and may be configured to include an implant hat part 110 with a specific structure and a distally extending stem 120.

[0048] To be specific, on the upper surface of the implant hat part 110, a curved surface structure that makes surface contact with the artificial joint attached to the bottom of the femur may be formed, while on the lower surface of the implant hat part 110, protrusions 111 protruding by a predetermined height in the direction of the top of the tibia may be formed in large numbers.

[0049] A distally extending stem 120 is configured to be formed to protrude downward by a predetermined length from the lower surface of the implant hat part 110, and to be inserted into the tibia by a predetermined depth from the top of the tibia and attached thereto.

[0050] The protrusions 111 formed on the lower surface of the implant hat part 110 may have a structure that is stably bound to the top surface of the tibia, and preferably, they may have pointed needle-like structures so as to be inserted into the tibia by a predetermined depth through the top surface of the tibia.

[0051] As shown in FIG. 3A, the protrusions 111 formed on the lower surface of the implant hat part 110 may be arranged in large numbers in a predetermined pattern over an area corresponding to the top surface of the tibia.

[0052] Also, the protrusions 111 formed on the lower surface of the implant hat part 110 are arranged in large numbers over the area corresponding to the top surface of the tibia, and an arrangement density of the protrusions 111 may be set differently depending on a magnitude and a location of load applied from the artificial joint attached to the bottom of the femur. (see the dotted line area shown in FIG. 3B)

[0053] In some cases, the protrusions 111 formed on the lower surface of the implant hat part 110 are arranged in large numbers over the area corresponding to the top surface of the tibia, and a protruding height of the protrusions 111 may be set differently depending on a magnitude and a location of load applied from the artificial joint attached to the bottom of the femur. In this case, although not shown in FIGS. 3A and 3B, it is preferable to set the protruding height of the protrusions 111 relatively longer at locations where the magnitude of the load is greater than that of the surrounding area.

[0054] FIG. 4 is a perspective view showing an artificial articulation according to another embodiment of the present disclosure.

[0055] Referring to FIG. 4, at least one osseointegration hole 112 for inducing osseointegration, after the artificial articulation is mounted on a patient subjected to surgery, may be formed on the lower side of the implant hat part 110 according to the embodiment.

[0056] In some cases, the osseointegration holes 112 may be arranged in large numbers in a predetermined pattern along an outer peripheral surface of the lower side of the implant hat part 110.

[0057] Also, the osseointegration holes 112 may be arranged in large numbers along an outer peripheral surface of the lower side of the implant hat part 110, and an arrangement density of the osseointegration holes 112 may be set differently depending on a magnitude and a location of load applied from the artificial joint attached to the bottom of the femur.

[0058] Meanwhile, as shown in FIG. 4, the lower surface 113 of the implant hat part 110 may have a mesh structure in which a plurality of pores are formed so as to effectively induce stable fixation of the artificial articulation 100 by inducing osseointegration after the artificial articulation 100 is mounted. Here, as shown in FIG. 5, it is preferable that the inside of the implant hat part 110 be a hollow structure.

[0059] FIG. 6 is a perspective view showing an artificial articulation according to yet another embodiment of the present disclosure, and FIG. 7 is a vertical cross-sectional view showing the artificial articulation according to yet another embodiment of the present disclosure.

[0060] Referring to these drawings, the side surface and the lower surface 113 of the implant hat part 110 of the artificial articulation 100 according to the embodiment may have porous structures in which a plurality of pores are formed. In the same way, an outer surface of the distally extending stem 120 may have a porous structure in which a plurality of pores are formed.

[0061] As such, osseointegration can be effectively induced, and as a result, the artificial articulation 100 can be stably attached to the top of the tibia.

[0062] In addition, at least one osseointegration hole 112 for inducing osseointegration is formed on the side surface of the distally extending stem 120 to effectively induce osseointegration.

[0063] As described above, the artificial articulation according to the present disclosure can be stably attached to the top of the tibia by having the implant hat part 110 with a specific structure and the distally extending stem 120.

[0064] Also, the artificial articulation according to the present disclosure can be stably attached to the top of the tibia by arranging the protrusions 111 with a specific structure on the lower surface of the implant hat part 110 in a predetermined pattern, by varying the arrangement density, or by varying the protruding height.

[0065] In addition, the artificial articulation according to the present disclosure makes it possible to control the degree of osseointegration in accordance with designer's intention by arranging the osseointegration holes 112 in a predetermined pattern on the lower side of the implant hat part 110 or by varying the arrangement density, so that the artificial articulation can be stably attached to the top of the tibia.

[0066] Also, the artificial articulation according to the present disclosure may induce effective osseointegration by having the lower surface 113 of the implant hat part 110 in a mesh structure or by having the inside of the implant hat part 110 in a hollow structure, so that the artificial articulation can be stably attached to the top of the tibia.

[0067] In addition, the artificial articulation according to the present disclosure may induce effective osseointegration by having a side surface and the lower surface 113 of the implant hat part 110 in porous structures in which a plurality of pores are formed, and by having an outer surface of the distally extending stem 120 in a porous structure in which a plurality of pores are formed, so that the artificial articulation can be stably attached to the top of the tibia.

[0068] Further, the artificial articulation according to the present disclosure may induce effective osseointegration by having at least one osseointegration hole 112 for inducing osseointegration, after the artificial articulation is mounted on a patient subjected to surgery, on a side surface of the distally extending stem 120, so that the artificial articulation can be stably attached to the top of the tibia.

[0069] In the above detailed description of the present disclosure, only specific embodiments thereof have been described. Hence, it should be understood that the present disclosure is not to be limited to the particular form mentioned in the detailed description, but rather to cover all modifications, equivalents, and substitutions falling within the spirit and scope of the present disclosure as defined by the appended claims.

[0070] That is, the present disclosure is not limited to the specific embodiments and descriptions described above, and any person skilled in the art to which the present disclosure pertains may implement various modifications without departing from the gist of the present disclosure as claimed in the claims, and such modifications shall fall within the scope of protection of the present disclosure.