Bone cement umbrella

Abstract

The utility model discloses a bone cement umbrella which comprises an umbrella body, the umbrella body is fixedly connected to a bone cement handle, the umbrella body is made of polyethylene, the bone cement handle is used for a femur and arranged in a marrow cavity in the femur, the edge of the umbrella body can be matched with the metaphysis of a femur prosthesis, and the umbrella body is opened in the direction from the far end of the femur to the femur. The problem that in an existing surgical operation, bone cement leaks towards the far end of the femur, and secondary taking-out is difficult possibly is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a bone cement umbrella. Background Technique

[0002] Periprosthetic Joint Infection (PJI) refers to the infection that occurs around the implanted prosthetic joint in the human body, usually caused by bacteria. PJI is a catastrophic complication in orthopedic surgery, and the incidence of PJI after hip and knee joint replacement is about 1%-3%. For the treatment of PJI, there are one-stage revision (1-stage exchange arthroplasty) and two-stage revision (2-stage exchange arthroplasty). Currently, the "gold standard" is still two-stage revision. The two-stage revision includes the following steps: removing the original prosthesis and bone cement; debriding and thoroughly removing the infected tissue; implanting a spacer with antibiotics at the joint; administering systemic antibiotic treatment for several weeks to completely clear the infection; performing a second operation after confirming that the infection is under control, removing the spacer and implanting a new prosthesis; continuing to administer the corresponding antibiotics after the operation to prevent the recurrence of infection. The two-stage revision treatment process usually takes more than 6 months to complete.

[0003] In recent years, some experts and scholars have proposed the concept of 1.5-stage exchange arthroplasty. In 1.5-stage revision, first remove the original joint prosthesis and bone cement, debride and thoroughly remove the infected tissue, implant an antibiotic-containing bone cement articulating spacer to retain joint mobility; supplemented with antibiotic treatment. As long as the patient can tolerate it, keep the articulating spacer in place. In addition to improving joint function and other advantages, the theoretical advantage of 1.5-stage revision is to avoid the second operation as much as possible, especially for high-risk patients with multiple underlying diseases, poor physical conditions, and unable to tolerate the second operation, which has greater advantages. Even if the patient does need a second operation, it is easier than the revision operation, and the patient can usually choose the most suitable time schedule.

[0004] 1. The key to the success of 1.5-stage revision treatment is the placement of an antibiotic-loaded cement articulating spacer after thorough debridement. Usually, to facilitate possible second-stage surgery for cement removal, the surgeon will choose to fix the cement to the proximal part of the femoral stem prosthesis and operate during the cement stringing stage, which greatly reduces the strength of cement fixation. If cement leakage to the distal femur can be prevented, we can operate during the doughy stage of the cement, which will greatly improve the bonding strength between the cement and the femoral prosthesis and between the cement and the host bone interface; if the infection can be effectively or thoroughly controlled at the same time, the in-situ retention time of the articulating spacer can be increased, or even continuous survival can be achieved. Utility Model Content

[0005] The present utility model aims to provide a cement umbrella to solve the problem that cement may leak to the distal femur during existing surgical operations, which may cause difficulties in second-stage removal.

[0006] To achieve the above object, the present utility model provides the following technical solution: A cement umbrella includes an umbrella body, the umbrella body is arranged on a cement stem, the cement stem is for the femur, the cement stem is arranged in the intramedullary cavity of the femur, and the umbrella body opens from the distal femur towards the femur direction.

[0007] Preferably, the umbrella body is fixedly connected to the cement stem.

[0008] Preferably, the edge of the umbrella body can match the metaphyseal end of the femoral prosthesis.

[0009] Preferably, the material of the umbrella body is polyethylene.

[0010] Principle and beneficial effects of this technical solution:

[0011] The cement umbrella matches the metaphyseal end of the femoral prosthesis, can block the intramedullary cavity of the femoral metaphyseal end to prevent cement from leaking to the distal femur, and at the same time, good adhesion is achieved between the upper surface and the cement, facilitating the integrated removal of the two during the second-stage revision without floating in the intramedullary cavity. The surgeon can operate during the doughy stage of the cement, and even achieve a certain degree of pressure perfusion of the cement, improving the adhesion and strength between the cement and the prosthesis and the bone interface, in order to extend the in-situ survival rate of the articulating spacer and improve the success rate of 1.5-stage revision of hip joint PJI. Description of the Drawings

[0012] Figure 1 It is a schematic structural diagram of a cement umbrella provided by an embodiment of the present utility model;

[0013] In the figure: 1. Umbrella body; 2. Cement stem. Detailed Embodiment

[0014] The following further elaborates on the present utility model in conjunction with the accompanying drawings and embodiments:

[0015] As Figure 1 shown, a bone cement umbrella includes an umbrella body 1, the umbrella body 1 is fixedly connected to a bone cement handle 2, the material of the umbrella body 1 is polyethylene or other absorbable materials, the bone cement handle 2 is for the femur, the bone cement handle 2 is disposed in the intramedullary cavity of the femur, the edge of the umbrella body 1 can match the metaphyseal end of the femoral prosthesis, and the umbrella body 1 opens from the distal end of the femur towards the femur direction.

[0016] The specific implementation process is as follows:

[0017] Before the surgical operation, first manufacture the bone cement umbrella at the corresponding position of the bone cement handle 2 according to the shape of the patient's metaphyseal end. After the umbrella body 1 solidifies, install the bone cement handle 2 at the patient's femur, and perform the subsequent surgical operation. The bone cement leaking towards the distal end of the femur will be blocked by the umbrella body 1 inside the umbrella body 1 or above the umbrella body 1 and will not enter the medullary cavity. When secondary revision is required, the umbrella body 1 will be taken out together with the leaking bone cement, and then the subsequent operation can be carried out.

[0018] The above are only the embodiments of the present utility model. Specific technical solutions or common knowledge such as characteristics well known in the art are not described in detail herein. For those skilled in the art, without departing from the technical solution of the present utility model, several deformations and improvements can still be made, and these should also be regarded as the protection scope of the present utility model, and these will not affect the implementation effect of the present utility model and the practicality of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. A bone cement umbrella, characterized in that: It includes an umbrella body (1), the umbrella body (1) is arranged on a bone cement stem (2), the bone cement stem (2) is for the femur, the bone cement stem (2) is arranged in the intramedullary cavity of the femur, and the umbrella body (1) opens from the distal end of the femur towards the femur direction.

2. The bone cement umbrella according to claim 1, characterized in that: The umbrella body (1) is fixedly connected to the bone cement stem (2).

3. The bone cement umbrella according to claim 1, characterized in that: The edge of the umbrella body (1) can match the metaphyseal end of the femoral prosthesis.

4. The bone cement umbrella according to claim 1, wherein: The material of the umbrella body (1) is polyethylene.

Images