Bone cement spacer

Abstract

The utility model relates to the technical field of bone cement placeholders, and discloses a bone cement placeholder which is effectively matched with the knee joint part of a patient in the actual use process through a femoral condyle, an outer condyle and an inner condyle arranged on the bone cement placeholder, so that the postoperative functional exercise of the patient is facilitated; by arranging the extension rod, the mounting stability of the thighbone end bone cement spacer can be improved, and the risk that the thighbone end bone cement spacer loosens and shifts after an operation is reduced; the gasket and the platform are integrally formed in the tibia end bone cement spacer, the appearance that the gasket and the platform are integrated is adopted, the overall thickness of the platform and the gasket can be increased, the strength of the tibia end bone cement spacer is enhanced, and the risk that the tibia end bone cement spacer is broken in the later period is reduced. According to the utility model, the overall stability of the spacer is enhanced, and the risks of displacement, looseness and fracture of the spacer are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of bone cement placeholders, in particular to a bone cement placeholder. Background Art

[0002] Static antibiotic bone cement placeholders and mobile bone cement placeholders are often used clinically. However, static antibiotic bone cement placeholders are used in the second-stage revision of the knee joint, which solves the problems of soft tissue contracture to a certain extent, but there are problems such as limited joint function after surgery, easy dislocation of the placeholder, and difficulty in exposure during the second-stage surgery. The biggest difference between mobile placeholders and static placeholders is that they can theoretically provide better mobility, which is conducive to postoperative functional recovery; avoid joint stiffness, prevent scar formation, and facilitate exposure during secondary surgery. However, the existing mobile bone cement placeholders are prone to loosening and displacement after installation. At the same time, due to the strength limitation of bone cement, bone cement placeholders are prone to breakage during postoperative functional exercise, which is not conducive to patient recovery and affects the surgical effect. Utility Model Content

[0003] 1. Technical issues to be solved

[0004] In view of the deficiencies of the prior art, the utility model provides a bone cement placeholder, which solves the problem that the prior movable bone cement placeholder is prone to loosening and displacement and is prone to breakage due to strength limitation.

[0005] (II) Technical solution

[0006] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A bone cement placeholder includes a femoral end bone cement placeholder, the femoral end bone cement placeholder includes a femoral condyle, a lateral condyle and a medial condyle, a condylar gap is arranged between the lateral condyle and the medial condyle, the femoral condyle is located on the condylar gap and a convex surface is arranged on the convex surface, an extension rod is arranged on the convex surface, and the extension rod is used to be inserted into the femur.

[0008] Preferably, it also includes a tibial end bone cement placeholder, which includes a platform and a fixing rod, the fixing rod is fixedly connected to the platform, the fixing rod is inserted on the tibia, and a gasket is integrally formed on the platform, and the gasket is provided with a concave upper surface matching the femoral end bone cement placeholder.

[0009] Preferably, the bottom area of ​​the gasket is smaller than the upper surface area of ​​the platform.

[0010] Preferably, the femoral end bone cement placeholder and the tibial end bone cement placeholder are both made of bone cement in one piece.

[0011] Preferably, during the process of forming the placeholder, the inner cavities of the extension rod and the fixing rod are both covered with reinforcing columns, and the reinforcing columns do not extend out of the surfaces of the femoral end bone cement placeholder and the gasket.

[0012] Preferably, the reinforcing column is a column made of Kirschner wire or other medical steel materials.

[0013] A bone cement placeholder includes a femoral end bone cement placeholder, the femoral end bone cement placeholder includes a femoral condyle, a lateral condyle and a medial condyle, a condylar gap is arranged between the lateral condyle and the medial condyle, and the femoral condyle is symmetrically arranged with an extension rod around the condylar gap.

[0014] A bone cement placeholder includes a femoral end bone cement placeholder, the femoral end bone cement placeholder includes a femoral condyle, a lateral condyle and a medial condyle, a filling surface is provided between the lateral condyle and the medial condyle, an extension rod is arranged on the filling surface, and two other extension rods are symmetrically arranged with the extension rod.

[0015] (III) Beneficial effects

[0016] The utility model has the following beneficial effects:

[0017] The bone cement spacer, the femoral bone cement spacer, can effectively adapt to the patient's knee joint during actual use through the arranged femoral condyle, lateral condyle and medial condyle, so as to facilitate the patient to perform postoperative functional exercises; the arranged extension rod can improve the stability of the installation of the femoral end bone cement spacer, and reduce the risk of loosening and displacement of the femoral end bone cement spacer after surgery; the integrally formed gasket and platform in the tibial end bone cement spacer adopts the appearance of the gasket and the platform being integrated, which can increase the overall thickness of the platform and the gasket, strengthen the strength of the tibial end bone cement spacer, and reduce the risk of fracture of the tibial end bone cement spacer in the later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the assembly state of the femoral end bone cement placeholder and the tibial end bone cement placeholder of the utility model;

[0019] Figure 2 It is a schematic diagram of the overall structure of the utility model in a side view of the assembled state of the femoral end bone cement placeholder and the tibial end bone cement placeholder;

[0020] Figure 3 It is a schematic diagram of the overall structure of the femoral end bone cement spacer and the tibial end bone cement spacer of the utility model;

[0021] Figure 4 This is a schematic diagram of the overall structure of another femoral end bone cement spacer corresponding to the utility model;

[0022] Figure 5 This is a schematic diagram of the overall structure of another femoral end bone cement spacer corresponding to the utility model

[0023] In the figure: 1, femoral condyle; 2, lateral condyle; 3, medial condyle; 4, condylar space; 5, raised surface; 6, extension rod; 7, platform; 8, fixing rod; 9, gasket; 10, upper surface. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1 The utility model provides a technical solution: a bone cement placeholder, including a femoral end bone cement placeholder, the femoral end bone cement placeholder includes a femoral condyle 1, a lateral condyle 2 and a medial condyle 3, a condylar gap 4 is arranged between the lateral condyle 2 and the medial condyle 3, the femoral condyle 1 is located on the condylar gap 4 and is provided with a convex surface 5, an extension rod 6 is arranged on the convex surface 5, and the extension rod 6 is used to be inserted into the femur.

[0026] In the utility model, the femoral bone cement spacer can effectively adapt to the patient's knee joint during actual use through the provided femoral condyle 1, lateral condyle 2 and medial condyle 3, so as to facilitate the patient to perform postoperative functional exercises; the provided extension rod 6 can improve the stability of the installation of the femoral end bone cement spacer, and reduce the risk of loosening and displacement of the femoral end bone cement spacer after surgery.

[0027] In this embodiment, a tibial end bone cement placeholder is also included, which includes a platform 7 and a fixing rod 8. The fixing rod 8 is fixedly connected to the platform 7, and the fixing rod 8 is inserted into the tibia. A gasket 9 is integrally formed on the platform 7, and the gasket 9 is provided with a concave upper surface 10 that matches the femoral end bone cement placeholder.

[0028] In this embodiment, the bottom area of ​​the gasket 9 is smaller than the upper surface 10 of the platform 7. Figure 3 As shown, by designing the bottom area of ​​the gasket 9 to be smaller than the upper surface 10 of the wall platform 7: firstly, it can reduce the friction in the knee joint cavity, thereby reducing the debris particles generated by wear and reducing the inflammatory response; secondly, it can make the patellar track run better and be more conducive to flexion and extension.

[0029] In the utility model, the gasket 9 and the platform 7 are integrally formed in the tibial end bone cement placeholder, and the appearance of the gasket 9 and the platform 7 being integrated into one can increase the overall thickness of the platform 7 and the gasket 9, strengthen the strength of the tibial end bone cement placeholder, and reduce the risk of fracture of the tibial end bone cement placeholder in the later stage.

[0030] In this embodiment, the femoral end bone cement placeholder and the tibial end bone cement placeholder are both made of bone cement in one piece.

[0031] In this embodiment, during the process of forming the placeholder, the inner cavity of the extension rod 6 and the fixing rod 8 is covered with a reinforcing column, and the reinforcing column does not extend out of the surface of the femoral end bone cement placeholder and the gasket 9. By adding Kirschner wires or other columns made of medical steel to the extension rod 6 at the femoral end, the fixing rod 8 at the tibial end and the platform 7, the strength of the bone cement placeholder is effectively improved, and the risk of displacement, loosening and fracture of the placeholder is reduced.

[0032] In this embodiment, the reinforcing column is a column made of Kirschner wire or other medical steel materials.

[0033] A bone cement placeholder includes a femoral end bone cement placeholder, the femoral end bone cement placeholder includes a femoral condyle 1, a lateral condyle 2 and a medial condyle 3, a condylar gap 4 is arranged between the lateral condyle 2 and the medial condyle 3, and the femoral condyle 1 is symmetrically arranged with an extension rod 6 around the condylar gap 4. Figure 4 As shown, by symmetrically setting the extension rod in the condylar gap, it can be inserted into the medial condyle and the outer shell of the distal femur, so as to play the role of stably installing the femoral end bone cement placeholder.

[0034] A bone cement placeholder includes a femoral end bone cement placeholder, the femoral end bone cement placeholder includes a femoral condyle 1, a lateral condyle 2 and a medial condyle 3, a filling surface is provided between the lateral condyle 2 and the medial condyle 3, an extension rod 6 is arranged on the filling surface, and two other extension rods 6 are symmetrically arranged with respect to the extension rod 6. Figure 5 As shown, by setting up three extension rods 6, while cooperating with the medial condyle and lateral condyle of the distal femur to firmly install the femoral end bone cement spacer, the middle extension rod 6 can continuously release antibiotics into the femoral medullary cavity, effectively reducing the risk of postoperative infection in patients.

[0035] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bone cement spacer, characterized in that: It comprises a femoral end bone cement placeholder, which comprises a femoral condyle, a lateral condyle and a medial condyle, a condylar gap is arranged between the lateral condyle and the medial condyle, and an extension rod is symmetrically arranged on the femoral condyle with the condylar gap as the center; the extension rod is used for being inserted into the femur.

2. A bone cement spacer according to claim 1, characterized in that: It also includes a tibial end bone cement placeholder, which includes a platform and a fixing rod, the fixing rod is fixedly connected to the platform, the fixing rod is inserted on the tibia, a gasket is integrally formed on the platform, and the gasket is provided with a concave upper surface matching the femoral end bone cement placeholder.

3. A bone cement spacer according to claim 2, characterized in that: The bottom area of ​​the gasket is smaller than the upper surface area of ​​the platform.

4. A bone cement spacer according to claim 2 or 3, characterized in that: The femoral end bone cement placeholder and the tibial end bone cement placeholder are both made of bone cement in one piece.

5. A bone cement spacer according to claim 4, characterized in that: During the process of forming the placeholder, the inner cavities of the extension rod and the fixing rod are both covered with reinforcing columns; the reinforcing columns do not extend out of the surfaces of the femoral end bone cement placeholder and the gasket.

6. A bone cement spacer according to claim 5, characterized in that: The reinforcing column is a column made of Kirschner wire or other medical steel materials.

7. A bone cement spacer according to claim 1, characterized in that: A filling surface is provided between the lateral condyle and the medial condyle, an extension rod is arranged on the filling surface, and another two extension rods are symmetrically arranged with respect to the extension rod.

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