A combined epiphysis-retaining tumor-type knee prosthesis

Abstract

The present invention discloses a combined tumor-type knee joint prosthesis with retained epiphysis, comprising a femoral prosthesis gripper, a connector and a femoral prosthesis stem component arranged from bottom to top; a plurality of gripper pieces are arranged at equal intervals at the bottom of the side end surface of the femoral prosthesis gripper; the femoral prosthesis gripper is fixedly connected to the connector; a side hole plate is arranged at the top of the side end surface of the connector, and four side screw holes are opened at equal intervals from top to bottom on the side hole plate. The combined tumor-type knee joint prosthesis with retained epiphysis of the present invention can effectively retain the epiphysis after the resection of malignant bone tumor of distal femur in children, retain the growth ability of the epiphysis, and the stability of the knee joint, and can effectively reduce clinical problems such as unequal length of lower limbs after bone tumor surgery in children.

Description

Technical Field

[0001] The invention relates to a knee joint prosthesis, in particular to a combined epiphysis-retaining tumor-type knee joint prosthesis. Background Art

[0002] The pathogenesis of osteosarcoma is still unclear. The main site of disease is located in the epiphysis of the long tubular bones of the limbs, and the distal femur is the most common site. The main problem of limb salvage in children is that the patients will suffer from shortening of the affected limbs and joint deformities due to destruction of the epiphysis, and even severe lameness and compensatory scoliosis in adulthood. Although there are extendable prostheses, they still cannot effectively solve the problem of limb shortening. If the tumor does not invade the epiphysis, limb salvage surgery that preserves the epiphysis has become the preferred method for treating distal femoral osteosarcoma in children today. Therefore, customized tumor-type prostheses that preserve the epiphysis are particularly important in limb salvage treatment of distal femoral osteosarcoma in children.

[0003] At present, the limb-salvage surgical methods for preserving epiphysis used in clinical practice mainly include epiphyseal preservation bone devitalization and replantation, epiphyseal distraction + large allogeneic bone, autologous bone transplantation and epiphyseal preservation metastatic bone growth. Although these methods can minimize epiphyseal damage to the greatest extent, they also have many major complications (such as long operation time, infection, absorption of transplanted bone or devitalized bone, non-union or delayed union of fracture ends and loosening of internal fixation). Compared with the above reconstruction methods that preserve the epiphysis, tumor-type prostheses have the following characteristics: (1) Since the patient's own joint is preserved, the joint movement is basically not affected after surgery, and the knee joint function can be restored early through early functional exercise; (2) Since the patient's own epiphysis is preserved, the limb has the potential to grow, and the limb length can be preserved to the maximum extent; (3) Compared with devitalized reimplantation or large-segment allogeneic bone reconstruction, tumor-type prostheses will not cause bone nonunion, so patients do not need to wait for bone healing for limb functional exercise; (4) The reconstruction surgery of tumor-type prostheses is relatively easy, the operation time may be slightly shorter, no secondary surgery is required, and early complications are less; (5) Improve the patient's quality of life. The key to customizing tumor-type prostheses that preserve the epiphysis is how to fix the prosthesis to the remaining epiphysis.

[0004] The tumor-type knee prosthesis currently used in clinical practice, although it protects the stability of the knee joint to a certain extent, has caused damage to the epiphysis of children. At present, there is no ideal tumor-type knee prosthesis that retains the epiphysis. How to break through conventional means and how to adopt an advanced method that is both ideal and reliable for current clinical surgery has become an urgent direction.

[0005] Therefore, the existing complications of knee prostheses, such as long operation time, infection, absorption of transplanted bone or inactivated bone, non-union or delayed union of fracture ends and loosening of internal fixation, as well as damage to children's epiphysis caused by tumor-induced knee prostheses, have become technical problems that need to be urgently solved by technical personnel in this field. Summary of the invention

[0006] The present invention provides a combined tumor-type knee prosthesis that retains the epiphysis in order to solve the problems of the existing knee prosthesis, such as long operation time, infection, absorption of transplanted bone or inactivated bone, non-union or delayed union of fracture ends and loosening of internal fixation, as well as damage to the epiphysis of children caused by tumor-induced knee prosthesis.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] Provided is a combined tumor-type knee joint prosthesis that retains epiphysis, comprising a femoral prosthesis gripper 1, a connector 2 and a femoral prosthesis shaft component 3 arranged from bottom to top; a plurality of gripping pieces 4 are evenly spaced at the bottom of the side end surface of the femoral prosthesis gripper 1, and the femoral prosthesis gripper 1 wraps the human epiphysis 12 through the plurality of gripping pieces 4; the femoral prosthesis gripper 1 is fixedly connected to the connector 2; a side hole plate 7 is provided on the side end surface of the femoral prosthesis shaft component 3, a plurality of side screw holes 8 are evenly spaced from top to bottom on the side hole plate 7, the top of the femoral prosthesis shaft component 3 is inserted into the human femur 14 and the side hole plate 7 is located on the side end surface of the human femur 14.

[0009] Furthermore, the upper end surface of the connecting member 2 is provided with a first snap-fit ​​protrusion 5, and the lower end surface of the femoral prosthesis shaft component 3 is provided with a first snap-fit ​​groove 6, and the femoral prosthesis shaft component 3 and the connecting member 2 are connected by snap-fit.

[0010] Furthermore, a connecting groove 13 is provided at the bottom of the side end surface of the femoral prosthesis shaft component 3, and two connecting screw holes are provided in the connecting groove 13.

[0011] Furthermore, the two side screw holes 8 located at the bottom are aligned with the two connecting screw holes in the connecting groove 13, and the side hole plate 7 is fixedly connected to the femoral prosthesis shaft component 3 by bolts.

[0012] Furthermore, a second snap-fit ​​protrusion 9 is provided on the lower end surface of the connecting member 2, and a second snap-fit ​​groove 10 is provided on the upper end surface of the femoral prosthesis gripper 1, and the connecting member 2 and the femoral prosthesis gripper 1 are connected by snap-fit.

[0013] Furthermore, the side end surfaces of the plurality of gripping members 4 are provided with gripping screw holes 11 , and the plurality of gripping members 4 are fixedly connected to the human epiphysis 12 via bolts.

[0014] Furthermore, the length and width of the connecting groove 13 are 15-20 mm and 3-6 mm respectively.

[0015] Furthermore, the side hole plate 7 is fixedly connected to the human femur 14 by bolts.

[0016] Furthermore, the two connecting screw holes and the four side screw holes 8 are all adapted for bolts with a diameter of 4.5 mm.

[0017] Furthermore, the number of the plurality of gripping members 4 is 3-6.

[0018] The present invention adopts the above technical solution, which has the following technical effects compared with the prior art:

[0019] 1. The combined epiphysis-retaining tumor-type knee prosthesis is composed of a femoral prosthesis stem component, a femoral prosthesis distal "embracing" component, a femoral prosthesis gripper screw, a side hole plate and screws, and a connector, and has a simple structure and low cost.

[0020] 2. This combined epiphysis-retaining tumor-type knee prosthesis can be customized to suit individual needs based on the patient's preoperative three-dimensional CT scan data, including the corresponding size of the handle component, distal embracing prosthesis structure, connecting cross bar and corresponding screws, and is easy to operate.

[0021] 3. This combined tumor-type knee prosthesis that retains the epiphysis has an improved design of the distal part of the femoral prosthesis, removing the hinge structure and adding an "embracing" structure. It consists of fixed handles extending from both sides of the distal end of the prosthesis, with two screw holes on each side. Two locking screws are used on the inner and outer sides to fix the prosthesis to the epiphysis respectively. The "embracing" structure and the prosthesis handle are connected by a transverse connecting plate. Since the force between the prosthesis and the epiphysis is mainly longitudinal gravity, the screws will not loosen laterally, ensuring that four locking screws are sufficient to fix the prosthesis to the epiphysis.

[0022] 4. The "embracing" structure of the distal end of the combined tumor-type knee prosthesis that retains the epiphysis can effectively retain the epiphysis after resection of malignant bone tumors in the distal femur of children, retain the growth ability of the epiphysis, and the stability of the knee joint, and can effectively reduce clinical problems such as unequal length of lower limbs and poor knee joint function after surgery for malignant bone tumors in the distal femur of children. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the combined epiphysis-retaining tumor-type knee joint prosthesis of the present invention in an anterior view;

[0024] Figure 2 A schematic diagram of the proximal lateral position of the combined epiphysis-retaining tumor-type knee joint prosthesis of the present invention;

[0025] Figure 3 A schematic diagram of the distal lateral position of the combined epiphysis-retaining tumor-type knee joint prosthesis of the present invention;

[0026] Figure 4It is a schematic diagram of the bottom surface view of the distal end of the combined epiphysis-retaining tumor-type knee joint prosthesis of the present invention;

[0027] Figure 5 It is a schematic structural diagram of the connecting member in the combined epiphysis-retaining tumor-type knee joint prosthesis of the present invention;

[0028] Figure 6 It is a schematic structural diagram of the femoral prosthesis stem component in the combined epiphysis-retaining tumor-type knee joint prosthesis of the present invention;

[0029] Wherein, each figure is marked as:

[0030] 1-femoral prosthesis gripper, 2-connecting piece, 3-femoral prosthesis stem component, 4-gripper, 5-first buckle protrusion, 6-first buckle groove, 7-side hole plate, 8-side screw hole, 9-second buckle protrusion, 10-second buckle groove, 11-gripper screw hole, 12-human epiphysis, 13-connecting groove, 14-human femur. DETAILED DESCRIPTION

[0031] The present invention is described in detail and specifically by specific examples below to provide a better understanding of the present invention, but the following examples do not limit the scope of the present invention.

[0032] like Figure 1 As shown, an embodiment of the present invention provides a combined tumor-type knee joint prosthesis that retains the epiphysis, including a femoral prosthesis gripper 1, a connector 2 and a femoral prosthesis shaft component 3 arranged from bottom to top; a plurality of gripping pieces 4 are evenly spaced at the bottom of the side end surface of the femoral prosthesis gripper 1, and the femoral prosthesis gripper 1 wraps the human epiphysis 12 through the plurality of gripping pieces 4; the femoral prosthesis gripper 1 is fixedly connected to the connector 2; a side hole plate 7 is provided on the side end surface of the femoral prosthesis shaft component 3, and a plurality of side screw holes 8 are evenly spaced from top to bottom on the side hole plate 7, the top of the femoral prosthesis shaft component 3 is inserted into the human femur 14 and the side hole plate 7 is located on the side end surface of the human femur 14.

[0033] In one aspect of this embodiment, Figure 2 As shown in 4 and 5, the upper end surface of the connecting member 2 is provided with a first snap protrusion 5, and the lower end surface of the femoral prosthesis shaft component 3 is provided with a first snap groove 6, and the femoral prosthesis shaft component 3 and the connecting member 2 are connected by a snap connection.

[0034] In one aspect of this embodiment, Figure 1 As shown in FIG. 6 , a connecting groove 13 is provided at the bottom of the side end surface of the femoral prosthesis shaft component 3 , and two connecting screw holes are provided in the connecting groove 13 .

[0035] In one aspect of this embodiment, Figure 1As shown in 2, 4, and 6, the two side screw holes 8 located at the bottom are aligned with the two connecting screw holes in the connecting groove 13 and the side hole plate 7 is fixedly connected to the femoral prosthesis shaft component 3 by bolts.

[0036] In one aspect of this embodiment, Figure 4-5 As shown, the lower end surface of the connecting member 2 is provided with a second buckle protrusion 9, and the upper end surface of the femoral prosthesis gripper 1 is provided with a second buckle groove 10, and the connecting member 2 and the femoral prosthesis gripper 1 are connected by buckles.

[0037] In one aspect of this embodiment, Figure 1-2 As shown, the side end surfaces of the plurality of gripping members 4 are all provided with gripping screw holes 11 , and the plurality of gripping members 4 are fixedly connected to the human epiphysis 12 by bolts.

[0038] In one aspect of this embodiment, Figure 5 As shown, the length and width of the connecting groove 13 are 15-20 mm and 3-6 mm respectively.

[0039] In one aspect of this embodiment, Figure 1 As shown, the side hole plate 7 is fixedly connected to the human femur 14 by bolts.

[0040] In one aspect of this embodiment, Figure 1 As shown in 2,4-6, the two connecting screw holes and the four side screw holes 8 are all suitable for bolts with a diameter of 4.5 mm.

[0041] In one aspect of this embodiment, Figure 1-3 As shown, the number of the plurality of gripping members 4 is 3-6.

[0042] The present invention aims to solve the problems of existing knee prostheses with many complications, such as long operation time, infection, absorption of transplanted bone or inactivated bone, non-union or delayed union of fracture ends and loosening of internal fixation, as well as damage to the epiphysis of children caused by tumor-induced knee prostheses. The present invention can effectively preserve the epiphysis of children after resection of malignant bone tumors at the distal femur, preserve the growth ability of the epiphysis, and the stability of the knee joint, and can effectively reduce clinical problems such as unequal length of lower limbs after bone tumor surgery in children.

[0043] The specific embodiments of the practical combined epiphysis-retaining tumor-type knee joint prosthesis are described in detail above, but they are only used as examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions made to the present invention are also within the scope of the present invention. Therefore, the equalization changes and modifications made without departing from the spirit and scope of the present invention should be included in the scope of the present invention.

Claims

1. A combined epiphysis-retaining tumor-type knee prosthesis, characterized in that: The invention comprises a femoral prosthesis gripper (1), a connecting piece (2) and a femoral prosthesis stem component (3) which are arranged from bottom to top; a plurality of gripping pieces (4) are arranged at equal intervals at the bottom of the side end surface of the femoral prosthesis gripper (1), and the femoral prosthesis gripper (1) wraps around a human epiphysis (12) via the plurality of gripping pieces (4); the femoral prosthesis gripper (1) is fixedly connected to the connecting piece (2); a side hole plate (7) is arranged at the side end surface of the femoral prosthesis stem component (3), and a plurality of side screw holes (8) are opened at equal intervals from top to bottom on the side hole plate (7); the top of the femoral prosthesis stem component (3) is inserted into a human femur (14), and the side hole plate (7) is located at the side end surface of the human femur (14); Wherein, a connecting groove (13) is provided at the bottom of the side end surface of the femoral prosthesis stem component (3), and two connecting screw holes are provided in the connecting groove (13); The two side screw holes (8) located at the bottom are aligned with the two connecting screw holes in the connecting groove (13), and the side hole plate (7) is fixedly connected to the femoral prosthesis stem component (3) by bolts; Wherein, the side hole plate (7) is fixedly connected to the human femur (14) by means of bolts; Wherein, the side end surfaces of the plurality of gripping members (4) are each provided with a gripping screw hole (11), and the plurality of gripping members (4) are each fixedly connected to a human epiphysis (12) via a bolt; Wherein, the number of the plurality of gripping members (4) is 3-6.

2. The combined epiphysis-retaining tumor-type knee joint prosthesis according to claim 1, characterized in that: The upper end surface of the connecting piece (2) is provided with a first snap-fit ​​protrusion (5), the lower end surface of the femoral prosthesis stem component (3) is provided with a first snap-fit ​​groove (6), and the femoral prosthesis stem component (3) and the connecting piece (2) are connected via a snap-fit ​​connection.

3. The combined epiphysis-retaining tumor-type knee joint prosthesis according to claim 1, characterized in that: The lower end surface of the connecting piece (2) is provided with a second snap-fit ​​protrusion (9), the upper end surface of the femoral prosthesis gripper (1) is provided with a second snap-fit ​​groove (10), and the connecting piece (2) and the femoral prosthesis gripper (1) are connected via a snap-fit ​​connection.

4. The combined epiphysis-retaining tumor-type knee joint prosthesis according to claim 1, characterized in that: The length and width of the connecting groove (13) are 15-20 mm and 3-6 mm respectively.

5. The combined epiphysis-retaining tumor-type knee prosthesis according to claim 1, characterized in that: The two connecting screw holes and the four side screw holes (8) are all adapted to accommodate bolts with a diameter of 4.5 mm.

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