Bone cement prosthesis model for hip joint revision operation

Abstract

The utility model relates to the technical field of medical molds, in particular to a bone cement prosthesis model for a hip joint revision operation. The utility model provides a hip joint revision operation bone cement prosthesis model which comprises a hollow femoral head, a hollow femoral neck and a hollow femoral stem, and the femoral head, the femoral neck and the femoral stem are sequentially connected to form a hip joint cavity matched with a human hip joint; one end, far away from the femoral neck, of the femoral stem is provided with a bone cement injection port for injecting bone cement; the femoral head is formed by splicing a first half femoral head and a second half femoral head. A bone cement prosthesis manufactured by using the bone cement prosthesis model is basically consistent with a hip joint prosthesis in size, and the surface of the bone cement prosthesis is smooth enough, so that the friction between the bone cement prosthesis and the inner surface of an acetabulum can be reduced, and the pain of the hip joint is reduced; and secondly, the manufactured bone cement prosthesis is provided with a femoral stem similar to a real prosthesis, so that the muscle around the hip joint can be prevented from atrophy.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical mould technical field, concretely relates to a hip joint revision surgery bone cement prosthesis model. BACKGROUND

[0002] After total hip arthroplasty, hip joint infection needs to be treated by stage surgery, and the hip joint prosthesis is taken out in the first stage surgery, and the bone cement prosthesis is shaped, which is kneaded on the operating table by the surgeon, the shape of the bone cement prosthesis kneaded by hand is firstly not matched with the acetabulum, and the comfort is very poor, and the patient will feel pain when slightly moving the hip joint; Secondly, the bone cement prosthesis kneaded does not have a prosthesis handle extending into the femoral medullary cavity, and the length of the hip joint and lower limb cannot be maintained after the operation, which will cause the shortening of the affected limb and the muscle contracture around the hip joint, increasing the difficulty of the second stage hip joint revision surgery. SUMMARY

[0003] (I) The problem to be solved by the utility model is that the bone cement prosthesis kneaded by hand is not matched with the acetabulum, the comfort is very poor, and the bone cement prosthesis handle kneaded will cause muscle contracture around the hip joint, increasing the difficulty of the second stage hip joint revision surgery.

[0004] (II) TECHNICAL SOLUTION

[0005] A hip joint revision surgery bone cement prosthesis model, comprising a hollow femoral head, a hollow femoral neck and a hollow femoral handle, the femoral head, the femoral neck and the femoral handle are connected in sequence to form a hip joint cavity body matched with the human hip joint;

[0006] The end of the femoral handle away from the femoral neck is provided with a bone cement injection port for injecting bone cement;

[0007] The femoral head is spliced by a first half femoral head and a second half femoral head, and the first half femoral head and the second half femoral head are connected through a magnetic attraction mechanism;

[0008] The femoral neck is spliced by a first half femoral neck and a second half femoral neck, and the first half femoral neck and the second half femoral neck are connected through a magnetic attraction mechanism;

[0009] The femoral handle is spliced by a first half femoral handle and a second half femoral handle, and the first half femoral handle and the second half femoral handle are connected through a magnetic mechanism.

[0010] According to one embodiment of the utility model, the femoral head and the femoral neck are detachably connected, and the femoral neck and the femoral handle are detachably connected.

[0011] According to one embodiment of the utility model, the magnetic attraction mechanism comprises a first magnetic attraction block and a second magnetic attraction block which are one-to-one corresponding and mutually attracted.

[0012] According to one embodiment of the utility model, the first half femoral head is equipped with a plurality of first magnetic attraction blocks at the edge of the end face of the second half femoral head, the second half femoral head is equipped with a plurality of first magnet mounting holes at the edge of the end face of the first half femoral head, and one second magnetic attraction block is arranged in each first magnet mounting hole.

[0013] The first half femoral neck is equipped with a plurality of first magnetic attraction blocks at the edge of the end face of the second half femoral neck, the second half femoral neck is equipped with a plurality of second magnet mounting holes at the edge of the end face of the first half femoral neck, and one second magnetic attraction block is arranged in each second magnet mounting hole.

[0014] The first half femoral neck is equipped with a plurality of first magnetic attraction blocks at the edge of the end face of the second half femoral neck, the second half femoral neck is equipped with a plurality of second magnet mounting holes at the edge of the end face of the first half femoral neck, and one second magnetic attraction block is arranged in each second magnet mounting hole.

[0015] According to one embodiment of the utility model, at least one first insertion hole is arranged on the femoral head, and the axis of the first insertion hole passes through the femoral neck.

[0016] According to one embodiment of the utility model, at least one second insertion hole is arranged on the femoral stem, and the axis of the second insertion hole passes through the femoral stem.

[0017] According to one embodiment of the utility model, the first half femoral neck and the second half femoral neck are respectively equipped with a half ring seat on the side face of one end of the femoral head, the ring seat is equipped with a containing groove, a half ring rubber ring is placed in the containing groove, a plurality of fixing sheets are installed on the side face of the ring seat, and the fixing sheets and the end face of the femoral head are fixed through screws.

[0018] According to one embodiment of the utility model, the upper end faces of the first half femoral stem and the second half femoral stem are all equipped with a plurality of first magnet columns, the lower end faces of the first half femoral stem and the second half femoral stem are all equipped with insertion grooves, and one second magnet column corresponding to the first magnet column is installed in each insertion groove.

[0019] The utility model discloses beneficial effects:

[0020] First, the bone cement prosthesis model in the embodiment is manufactured in advance according to the actual size of the hip joint prosthesis, then assembled, and the first half femoral head, the first half femoral neck and the first half femoral stem are connected with the second half femoral head, the second half femoral neck and the second half femoral stem respectively by using the magnetic attraction mechanism to form a complete hip joint prosthesis model, then the bone cement is injected from the bone cement injection port at the end of the femoral stem away from the femoral neck, and after waiting for a period of time, the first half femoral head, the first half femoral neck and the first half femoral stem are separated from the second half femoral head, the second half femoral neck and the second half femoral stem respectively to take out the formed bone cement prosthesis.

[0021] Since the manufactured bone cement prosthesis is basically consistent with the size of the hip joint prosthesis, and the surface is smooth enough, the friction between the bone cement prosthesis and the inner surface of the acetabulum can be reduced, and the hip joint pain can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0023] Figure 1 The perspective view provided for the embodiment of the present application;

[0024] Figure 2 The first perspective view provided for the embodiment of the present application;

[0025] Figure 3 The second perspective view provided for the embodiment of the present application;

[0026] Figure 4 The sectional view provided for the embodiment of the present application;

[0027] Figure 5 Another exploded view of the femoral neck provided for the embodiment of the present application;

[0028] Figure 6 Another structure view of the femoral stem provided for the embodiment of the present application.

[0029] Icons: 1. Femoral head; 101. First insertion hole; 102. First magnet mounting hole; 2. Femoral neck; 201. Fixation plate; 202. Second insertion hole; 203. Second magnet mounting hole; 204. Ring seat; 205. Rubber ring; 3. Femoral stem; 301. Bone cement injection port; 302. Third magnet mounting hole; 303. First magnet post. Detailed Implementation

[0030] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] like Figures 1-4 As shown, one embodiment of this utility model provides a bone cement prosthesis model for hip revision surgery, including a hollow femoral head 1, a hollow femoral neck 2, and a hollow femoral stem 3. The femoral head 1, femoral neck 2, and femoral stem 3 are connected in sequence to form a hip joint cavity adapted to the human hip joint. The end of the femoral stem 3 away from the femoral neck 2 is provided with a bone cement injection port 301 for injecting bone cement.

[0032] The femoral head 1 is formed by splicing together the first half of the femoral head and the second half of the femoral head, and the first half of the femoral head and the second half of the femoral head are connected by a magnetic attraction mechanism; the femoral neck 2 is formed by splicing together the first half of the femoral neck and the second half of the femoral neck, and the first half of the femoral neck and the second half of the femoral neck are connected by a magnetic attraction mechanism; the femoral stem 3 is formed by splicing together the first half of the femoral stem and the second half of the femoral stem, and the first half of the femoral stem and the second half of the femoral stem are connected by a magnetic mechanism.

[0033] In this embodiment, a bone cement prosthesis model is first manufactured in advance according to the actual size of the hip joint prosthesis. Then, it is assembled by using a magnetic suction mechanism to connect the first half-femoral head, the first half-femoral neck, and the first half-femoral stem to the second half-femoral head, the second half-femoral neck, and the second half-femoral stem, respectively, to form a complete hip joint prosthesis model. Then, bone cement is injected into the bone cement injection port 301 at the end of the femoral stem 3 away from the femoral neck 2. After waiting for a certain period of time, once the bone cement has completely solidified, the first half-femoral head, the first half-femoral neck, and the first half-femoral stem are separated from the second half-femoral head, the second half-femoral neck, and the second half-femoral stem to remove the formed bone cement prosthesis.

[0034] Since the manufactured bone cement prosthesis is basically the same size as the hip joint prosthesis, and the surface is smooth enough (at least compared to the manually kneaded bone cement prosthesis), the friction between the bone cement prosthesis and the inner surface of the acetabulum can be reduced, and the hip joint pain can be reduced. Secondly, the manufactured bone cement prosthesis has a femoral stem 3 similar to the real prosthesis, which can keep the muscles around the hip joint from atrophy, reduce the difficulty of the second hip joint revision surgery, and maximize the preservation of the patient's hip joint function.

[0035] It should be noted that the inner walls of the femoral head 1, the femoral neck 2 and the femoral stem 3 in the embodiment are polished and very smooth, so that the surface of the manufactured bone cement prosthesis is smooth enough, thereby effectively reducing the friction between the bone cement prosthesis and the inner surface of the acetabulum, and reducing the hip joint pain.

[0036] As a specific embodiment, the first half femoral head, the first half femoral neck and the first half femoral stem are integrally formed, and the second half femoral head, the second half femoral neck and the second half femoral stem are also integrally formed.

[0037] In the embodiment, the magnetic attraction mechanism includes a first magnetic attraction block and a second magnetic attraction block corresponding to each other and attracted to each other. As shown in Figure 4 The end surface of the first half femoral head facing the second half femoral head is provided with a plurality of first magnetic attraction blocks, and the plurality of first magnetic attraction blocks are uniformly arranged along the edge of the first half femoral head. The end surface of the second half femoral head facing the first half femoral head is provided with a plurality of first magnetic attraction block mounting holes 102, and the plurality of first magnetic attraction block mounting holes 102 are uniformly arranged along the edge of the second half femoral head, and each first magnetic attraction block mounting hole 102 is provided with a second magnetic attraction block.

[0038] Further, the edge of the end surface of the first half femoral neck facing the second half femoral neck is provided with a plurality of first magnetic attraction blocks, and the edge of the end surface of the second half femoral neck facing the first half femoral neck is provided with a plurality of second magnetic attraction block mounting holes 203, and each second magnetic attraction block mounting hole 203 is provided with a second magnetic attraction block.

[0039] The edge of the end surface of the first half femoral stem facing the second half femoral stem is provided with a plurality of first magnetic attraction blocks, and the edge of the end surface of the second half femoral stem facing the first half femoral stem is provided with a plurality of third magnetic attraction block mounting holes 302, and each third magnetic attraction block mounting hole 302 is provided with a second magnetic attraction block. That is, the hip joint prosthesis model is composed of two parts. In this way, when assembling the hip joint prosthesis model, only the first part needs to be attached to the second part, and under the action of the magnetic attraction mechanism, the two parts are naturally and closely attached together, and the assembly and subsequent disassembly and removal of the bone cement prosthesis are very convenient.

[0040] As a preferred embodiment, in order to improve the overall strength of the manufactured bone cement prosthesis, as Figure 2As shown, at least one first insertion hole 101 is provided on the side of the femoral head 1 away from the femoral neck 2, and the axis of the first insertion hole 101 extends into the interior of the femoral neck 2. As shown, Figure 4 As shown, at least one second insertion hole 202 is provided on the outside of the curved portion of the femoral stem 3, and the axis of the second insertion hole 202 extends into the interior of the femoral stem 3.

[0041] In this way, before the injection of bone cement, a Kirschner wire or a metal rod or metal pin capable of improving the structural strength of the cemented prosthesis can be inserted into the first insertion hole 101 and the second insertion hole 202, respectively.

[0042] As an alternative embodiment, the femoral head 1 and the femoral neck 2 are detachably connected, and the femoral neck 2 and the femoral stem 3 are detachably connected. Specifically, as shown, Figure 6 As shown, a plurality of first magnetic columns 303 are installed on the upper end faces of the first half femoral stem and the second half femoral stem, and a plurality of insertion slots corresponding to the first magnetic columns 303 are provided in the lower end faces of the first half femoral stem and the second half femoral stem, and a second magnetic column corresponding to each first magnetic column 303 is installed in each insertion slot. In this way, when assembling the femoral neck 2 and the femoral stem 3, the first magnetic columns 303 at the top end of the femoral stem 3 are inserted into the insertion slots at the bottom end of the femoral neck 2, and the first magnetic columns 303 and the second magnetic columns are attracted to each other, thereby connecting the femoral neck 2 and the femoral stem 3.

[0043] In addition, as shown, Figure 5 As shown, a half-ring-shaped ring seat 204 is installed on the side surface of the top end of the first half femoral neck and the second half femoral neck, respectively, and the upper surface of the ring seat 204 has a receiving groove, a half-ring-shaped rubber ring 205 is provided in the receiving groove of the ring seat 204, a plurality of fixing pieces 201 are provided on the side surface of each ring seat 204, respectively, and a circular hole for a screw is provided on each fixing piece 201, and a plurality of screw holes are provided on the lower surface of the first half femoral head and the second half femoral head, respectively.

[0044] In this way, when assembling the femoral neck 2 and the femoral head 1, the two half-ring-shaped rubber rings 205 are placed in the receiving grooves of the two ring seats 204, respectively, and then the ring seats 204 are tightly fixed to the bottom end surface of the femoral head 1 using screws. The rubber ring 205 is tightly pressed against the lower surface of the femoral head 1 to serve as a seal, thereby improving the sealing performance of the connection between the femoral head 1 and the femoral neck 2.

[0045] In the description of the utility model, it is necessary to explain, the direction or position relation that the term "upper", "lower" and the like indicate is based on the direction or position relation shown in the drawing, is only for the convenience of describing the utility model and simplifying the description, and is not indicate or imply that the device or element indicated must have a particular orientation, construct and operate in a particular orientation, therefore can not be understood as the limitation of the utility model. In addition, the term "first", "second" is only for the purpose of description, and can not be understood as indicating or implying relative importance.

[0046] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, the term "installation", "communication", "connection" should be broad understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be direct communication, also can be indirectly communicated through the intermediate medium, can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances. In addition, in the description of the utility model, unless otherwise stated, the meaning of "multiple" is two or more than two.

[0047] The above is only the preferred embodiment of the utility model, and is not used to limit the utility model, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A hip revision surgery bone cement prosthesis phantom, characterized in that, It comprises a hollow femoral head (1), a hollow femoral neck (2) and a hollow femoral stem (3), which are connected in sequence to form a hip joint cavity adapted to human hip joint; The distal end of the femoral stem (3) away from the femoral neck (2) is provided with a cement injection port (301) for injecting bone cement; The femoral head (1) is spliced by a first half femoral head and a second half femoral head, and the first half femoral head and the second half femoral head are connected by a magnetic attraction mechanism. The femoral neck (2) is spliced by a first half femoral neck and a second half femoral neck, and the first half femoral neck and the second half femoral neck are connected by a magnetic attraction mechanism. The femoral stem (3) is spliced by a first half femoral stem and a second half femoral stem, and the first half femoral stem and the second half femoral stem are connected by a magnetic mechanism.

2. A hip revision surgery cemented prosthesis model according to claim 1, wherein, The femoral head (1) and the femoral neck (2) are detachably connected, and the femoral neck (2) and the femoral stem (3) are detachably connected.

3. A hip revision surgery cemented prosthesis phantom according to claim 2, wherein, The magnetic attraction mechanism comprises a first magnetic attraction block and a second magnetic attraction block corresponding to each other and attracting each other.

4. A hip revision surgery cemented prosthesis phantom according to claim 3, wherein, A plurality of first magnetic attraction blocks are installed at the edge of the end face of the first half femoral head facing the second half femoral head, and a plurality of first magnet mounting holes (102) are provided at the edge of the end face of the second half femoral head facing the first half femoral head, and each first magnet mounting hole (102) is provided with a second magnetic attraction block. A plurality of first magnetic attraction blocks are installed at the edge of the end face of the first half femoral neck facing the second half femoral neck, and a plurality of second magnet mounting holes (203) are provided at the edge of the end face of the second half femoral neck facing the first half femoral neck, and each second magnet mounting hole (203) is provided with a second magnetic attraction block. A plurality of first magnetic attraction blocks are installed at the edge of the end face of the first half femoral stem facing the second half femoral stem, and a plurality of third magnet mounting holes (302) are provided at the edge of the end face of the second half femoral stem facing the first half femoral stem, and each third magnet mounting hole (302) is provided with a second magnetic attraction block.

5. The hip revision surgery cemented prosthesis phantom of claim 1, wherein, At least one first insertion hole (101) is provided on the femoral head (1), and the axis of the first insertion hole (101) passes through the femoral neck (2).

6. A hip revision surgery cemented prosthesis phantom according to claim 1, wherein, At least one second insertion hole (202) is provided on the femoral stem (3), and the axis of the second insertion hole (202) passes through the femoral stem (3).

7. A hip revision surgery cemented prosthesis model according to claim 2, wherein, Half ring-shaped rubber rings (205) are placed in the accommodating grooves of the half-shaped ring seats (204) installed on the side faces of the first half femoral neck and the second half femoral neck facing one end of the femoral head (1), and a plurality of fixing pieces (201) are installed on the side faces of the ring seats (204), and the fixing pieces (201) and the end face of the femoral head (1) are fixed by screws.

8. A hip revision surgery cemented prosthesis phantom according to claim 7, characterized in that The upper end surface of the first and second femoral stems is provided with a plurality of first magnet columns (303), and the lower end surface of the first and second femoral stems is provided with a plurality of insertion slots, each of which is provided with a second magnet column corresponding to the first magnet column (303).

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