Proximal tibia substitute

Abstract

The utility model relates to a proximal tibia substitute which comprises a proximal tibia main body and is characterized in that a first threading hole and a second threading hole are formed in the upper portion of the proximal tibia main body, the first threading hole is formed in the rear end of the proximal tibia main body and penetrates through the proximal tibia main body in the coronal plane direction, and the second threading hole is formed in the rear end of the proximal tibia main body and penetrates through the proximal tibia main body in the coronal plane direction. The second threading holes are formed in the left end and the right end of the tibia near-end body, the second threading holes penetrate through the tibia near-end body in the sagittal coronal plane direction, and the tibia near-end replacement part can improve the stability of a prosthesis after implantation and is beneficial to better postoperative recovery.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a proximal tibia replacement component. Background Art

[0002] The knee joint is one of the common sites of primary malignant bone tumors. Malignant tumors such as osteosarcoma, Ewing's sarcoma, pleomorphic sarcoma, and chondrosarcoma are prone to occur in this site. In recent years, tumor resection and artificial joint prosthesis reconstruction have become the main treatment methods for malignant bone tumors around the knee joint because of their good postoperative functions such as immediate postoperative stability and early weight-bearing walking. At present, hinged tumor knee replacement is the most commonly used surgical reconstruction method. In reconstruction surgery, due to the large bone defect on the tibial side, there are no stable structures such as cruciate ligaments, joint capsules, and medial and lateral collateral ligaments around the knee joint. The proximal tibial prosthesis is usually fixed with the help of a medullary cavity extension rod. However, due to the different amount of osteotomy and individual differences between patients, the stability of the proximal tibial prosthesis after implantation is poor, which is not conducive to the patient's recovery. In severe cases, revision surgery is required. Revision surgery will face problems such as multiple surgeries, high economic costs, and large area of ​​trauma to patients. Utility Model Content

[0003] The utility model aims to provide a tibia proximal replacement part which has good stability and is conducive to postoperative recovery.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] A proximal tibial replacement component includes a proximal tibial body, wherein a first threading hole and a second threading hole are arranged on the upper part of the proximal tibial body, wherein the first threading hole is arranged at the rear end of the proximal tibial body, and the first threading hole passes through the proximal tibial body along the coronal plane direction, and the second threading hole is arranged at the left and right ends of the proximal tibial body, and the second threading hole passes through the proximal tibial body along the sagittal coronal plane direction.

[0006] In one embodiment, the projections of the first threading hole and the second threading hole on the front and rear sides are staggered.

[0007] In one embodiment, the number of the first threading holes is three, and the three first threading holes are spaced apart in the height direction.

[0008] In one embodiment, the number of the second threading holes is four, two of the second threading holes are respectively arranged at the left and right ends of the proximal tibia body, and the two second threading holes on the same side are spaced apart in the height direction.

[0009] In one embodiment, bone windows are provided on both left and right surfaces of the proximal tibia body, and the bone windows are grooves on the surface of the proximal tibia body.

[0010] In one embodiment, each of the bone windows is arranged corresponding to one of the second threading holes.

[0011] In one embodiment, the outer surface of the proximal tibial body is provided with a PPS coating.

[0012] In one embodiment, a liner groove is provided at the top of the proximal tibia body, the outer shape structure of the liner groove matches the meniscus liner, and a medullary cavity hole is also provided in the liner groove.

[0013] In one embodiment, the bottom end of the proximal tibia body has a tapered hole matching the medullary cavity extension rod, and the tapered hole is matched with the Morse taper of the frustum of the medullary cavity extension rod.

[0014] In one embodiment, the bottom end of the proximal tibial body has two symmetrically arranged bosses.

[0015] The utility model adopts the above technical solution, which has the beneficial effect that the proximal tibial replacement component provided by the utility model is provided with a first threading hole penetrating the proximal tibial body along the coronal plane direction and a second threading hole penetrating the proximal tibial body along the sagittal plane direction, so that the proximal tibial replacement component can be sutured and fixed to the soft tissues on the posterior side and left and right sides of the proximal tibia during surgery, which can improve the stability of the prosthesis after implantation and is conducive to better postoperative recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic perspective view of a proximal tibia replacement is shown.

[0017] Figure 2 A front view of a proximal tibia replacement is shown.

[0018] Figure 3 A schematic diagram showing the application of a proximal tibia replacement component in a knee joint prosthesis is shown. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings so that the purpose, features and advantages of the present invention can be more clearly understood. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[0020] In the following description, certain specific details are set forth for the purpose of illustrating various disclosed embodiments to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details. In other cases, well-known devices, structures, and techniques associated with the present application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0021] Unless the context requires otherwise, throughout the specification and claims, the word "comprise" and variations such as "include" and "have" should be construed in an open, inclusive sense, ie, should be interpreted as "including, but not limited to."

[0022] References throughout the specification to "one embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of "in one embodiment" or "in an embodiment" in various places throughout the specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any manner in one or more embodiments.

[0023] As used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and / or" unless the context clearly dictates otherwise.

[0024] In the following description, in order to clearly demonstrate the structure and working mode of the utility model, many directional words will be used for description, but the words "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", "down", etc. should be understood as convenient terms and should not be understood as restrictive terms.

[0025] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] like Figure 1-Figure 3 As shown, this embodiment provides a tibial proximal replacement, including a tibial proximal body 1 having an anatomical shape matching the proximal tibial bone of a human body, a liner groove 11 is provided on the top of the tibial proximal body 1, and the shape structure of the liner groove 11 matches the meniscus liner 2, so that the meniscus liner 2 can be firmly fixed in the liner groove 11. A medullary cavity hole 12 is also provided in the liner groove 11, and the aperture of the medullary cavity hole 12 matches the rod-shaped portion of the tibial rotation component 3, so that the rod-shaped portion of the tibial rotation component 3 can be inserted into the medullary cavity hole 12. In some embodiments, a tibial sleeve 4 is also included, which is sleeved on the rod-shaped portion of the tibial rotation component 3, and the tibial sleeve 4 is located in the medullary cavity 12 of the proximal tibial replacement component. The tibial sleeve 4 can better prevent the tibial rotation component 3 from being dislocated in the proximal tibial replacement component, and the rod-shaped portion of the tibial rotation component 3 can effectively rotate and move up and down without obstruction with the non-metallic tibial sleeve 4 during normal movement of the knee joint. The tibial rotation component 3 is hingedly connected with the femoral rotation component 5 to form a knee joint structure.

[0028] See also Figure 1 and Figure 2 The upper part of the proximal tibia body 1 is provided with a first threading hole 13 and a second threading hole 14. The first threading hole 13 is provided at the rear end of the proximal tibia body 1, and the first threading hole 13 penetrates the proximal tibia body 1 along the coronal plane. The proximal tibia body 1 in this embodiment is provided with three first threading holes 13, and the three first threading holes 13 are arranged at intervals in the height direction. The first threading holes 13 can suture the proximal tibia body 1 to the soft tissue on the posterior side of the tibia to fix the proximal tibia body 1.

[0029] The second threading holes 14 are arranged at the left and right ends of the proximal tibia body 1, and the second threading holes 14 penetrate the proximal tibia body 1 along the sagittal coronal plane. In this embodiment, four second threading holes 14 are arranged on the proximal tibia body 1, and the four second threading holes 14 are divided into two groups, two are arranged at the left and right ends respectively, and the two second threading holes 14 on the same side are arranged at intervals in the height direction. The second threading holes 14 can suture the proximal tibia body 1 to the soft tissues on the left and right sides of the tibia, and can fix the proximal tibia body 1.

[0030] The projections of the first threading hole 13 and the second threading hole 14 on the front and rear sides are staggered to avoid mutual interference during suturing.

[0031] See also Figure 1 and Figure 2 Two bone windows 15 are provided on the left and right surfaces of the proximal tibia body 1. Each bone window 15 is provided corresponding to a second threading hole 14. The bone window 15 allows part of the soft tissue to grow into the bone window 15 to better fix the proximal tibia body 1.

[0032] In addition, the outer surface area of ​​the proximal tibia body 1 is provided with a PPS coating, which is conducive to better tendon attachment, better postoperative recovery, and improved stability of the prosthesis after implantation.

[0033] See also Figure 1-Figure 3 The bottom end of the proximal tibia body 1 has a tapered hole (not visible in the viewing direction in the figure) that matches the medullary cavity extension rod 6. The tapered hole is matched with the Morse taper of the frustum portion 61 at the end of the medullary cavity extension rod 6 to facilitate the assembly between the proximal tibia body 1 and the medullary cavity extension rod 6.

[0034] Preferably, the bottom end of the proximal tibia body 1 also has two symmetrically arranged bosses 16, and the two bosses 16 are matched with the recesses on the medullary cavity extension rod 6. When the medullary cavity extension rod 6 is assembled with the proximal tibia body 1, the bosses 16 are located in the corresponding recesses to play an anti-rotation role for the medullary cavity extension rod 6.

[0035] The preferred embodiments of the present invention have been described in detail above, but it should be understood that after reading the above teachings of the present invention, those skilled in the art may make various changes or modifications to the present invention. These equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A proximal tibia replacement, comprising a proximal tibia body, characterized in that: The upper part of the proximal tibia body is provided with a first threading hole and a second threading hole, wherein the first threading hole is provided at the rear end of the proximal tibia body, and the first threading hole penetrates the proximal tibia body along the coronal plane direction, and the second threading hole is provided at the left and right ends of the proximal tibia body, and the second threading hole penetrates the proximal tibia body along the sagittal coronal plane direction.

2. The proximal tibia replacement according to claim 1, characterized in that: The projections of the first threading hole and the second threading hole on the front and rear sides are staggered.

3. The proximal tibia replacement according to claim 1, characterized in that: The number of the first threading holes is three, and the three first threading holes are arranged at intervals in the height direction.

4. The proximal tibia replacement according to claim 1, characterized in that: The number of the second threading holes is four, and two second threading holes are respectively arranged at the left and right ends of the proximal tibia body, and the two second threading holes on the same side are arranged at intervals in the height direction.

5. The proximal tibia replacement according to claim 1, characterized in that: Bone windows are arranged on both the left and right surfaces of the proximal tibia body, and the bone windows are grooves on the surface of the proximal tibia body.

6. The proximal tibia replacement according to claim 5, characterized in that: Each of the bone windows is arranged corresponding to one of the second threading holes.

7. The proximal tibia replacement according to claim 1, characterized in that: The outer surface of the proximal tibia body is provided with a PPS coating.

8. The proximal tibia replacement according to claim 1, characterized in that: A liner groove is arranged at the top of the proximal tibia body, the outer shape structure of the liner groove matches the meniscus liner, and a medullary cavity hole is also arranged in the liner groove.

9. The proximal tibia replacement according to claim 1, characterized in that: The bottom end of the proximal tibia body is provided with a tapered hole matching the medullary cavity extension rod, and the tapered hole is matched with the Morse taper of the frustum of the medullary cavity extension rod.

10. The proximal tibia replacement according to claim 1, characterized in that: The bottom end of the proximal tibia body has two symmetrically arranged bosses.

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