Femoral stem prosthesis and hip joint prosthesis having the same

Abstract

This invention provides a femoral stem prosthesis and a hip joint prosthesis having the same. The femoral stem prosthesis includes: a fixation cylinder disposed at the bottom of a support base, with a receiving portion on its inner wall, for insertion into the medullary cavity; an installation cylinder inserted into the fixation cylinder, having a first guide hole; a first limiting member movably inserted into the first guide hole, wherein when the first limiting member is in a limiting position, a portion of its structure is located within the receiving portion, and when the first limiting member is in a clearance position, it is located outside the receiving portion, allowing the installation cylinder and fixation cylinder to be separable; and a first driving member disposed within the installation cylinder, driving and engaging with the first limiting member to switch the first limiting member between the clearance and limiting positions. The technical solution of this application effectively solves the problem in related technologies where bone cement spacers cannot maintain normal biomechanical activity of the hip joint.

Description

Technical Field

[0001] This invention relates to the field of femoral stem technology, and more specifically, to a femoral stem prosthesis and a hip joint prosthesis having the same. Background Technology

[0002] After the femoral stem is implanted, infection may occur in the bone structures around the femoral stem, requiring a 1.5 stage revision surgery. During a 1.5 stage revision surgery, the femoral stem must first be removed, the infection controlled, and after the inflammation subsides, a second-stage revision prosthesis is implanted.

[0003] In related technologies, during the process of controlling infection, an antibiotic-impregnated bone cement spacer is implanted. However, the bone cement spacer is a non-functional structure that cannot maintain normal biomechanical activity of the hip joint, leading to prolonged bed rest, muscle atrophy, joint contractures, and abnormal gait, which seriously affects the patient's quality of life. Furthermore, the bone cement spacer is hard and the interface with the medullary cavity is prone to loosening. Secondary removal often causes femoral fractures and further bone loss, increasing the difficulty and risk of revision surgery. Summary of the Invention

[0004] The main objective of this invention is to provide a femoral stem prosthesis and a hip joint prosthesis having the same, in order to solve the problem that bone cement spacers in related technologies cannot maintain normal biomechanical activity of the hip joint.

[0005] To achieve the above objectives, according to one aspect of the present invention, a femoral stem prosthesis is provided, comprising: a support assembly including a support base and a support rod, the support rod being disposed on the support base, the axis of the support rod being set at an angle to the axis of the support base; a fixing cylinder disposed at the bottom of the support base, the inner wall of the fixing cylinder having a receiving portion, the fixing cylinder being for insertion into the medullary cavity; an installation cylinder being inserted into the fixing cylinder, the installation cylinder having a first guide hole; a first limiting member movably inserted into the first guide hole, the first limiting member having a limiting position and an abduction position, when the first limiting member is in the limiting position, a portion of the structure of the first limiting member is located within the receiving portion, and when the first limiting member is in the abduction position, the first limiting member is located outside the receiving portion, so that the installation cylinder and the fixing cylinder are separable; and a first driving member disposed within the installation cylinder, the first driving member drivingly cooperating with the first limiting member to switch the first limiting member between the abduction position and the limiting position.

[0006] Furthermore, the first driving member is rotatably configured, and a first driving groove is provided on the first driving member. The distance between the first end of the first driving groove and the axis of the first driving member is less than the distance between the second end of the first driving groove and the axis of the first driving member. The femoral stem prosthesis also includes a first transmission rod, which passes through the first driving groove, and a first limiting member is connected to the first transmission rod.

[0007] Furthermore, the first driving member is provided with a first clearance groove and a first mounting space. The first mounting space is located inside the first driving member. The first clearance groove is provided on the side wall of the first driving member. The first clearance groove communicates with the first driving groove through the first mounting space. The first limiting member passes through the first clearance groove. The connection between the first limiting member and the first transmission rod is located in the first mounting space. The first clearance groove is correspondingly provided with the first guide hole.

[0008] Furthermore, the femoral stem prosthesis also includes an extension and a second limiting member. The extension is located at the end of the first drive member away from the support base, and the axis of the extension is parallel to the rotation axis of the first drive member. The second limiting member is disposed on the extension and has an extended position extending out of the extension and a retracted position retracted out of the extension.

[0009] Furthermore, a plane perpendicular to the axis of the extension member is set as a preset plane. When the second limiting member is in the extended position, the area enclosed by the projection of the second limiting member on the preset plane is the first projection area, and the area enclosed by the projection of the inner surface of the fixed cylinder on the preset plane is the second projection area. The first projection area is located within the second projection area.

[0010] Furthermore, the extension member includes an extension tube, the first driving member includes a driving tube, and the femoral stem prosthesis also includes a second driving member. The second driving member is adjustablely inserted into the driving tube and the extension tube. The extension tube is provided with a second guide hole, and a second limiting member is inserted into the second guide hole. The second driving member and the second limiting member drive each other to make the second limiting member extend out of the extension tube through the second guide hole.

[0011] Furthermore, the second driving member includes a driving column, which is rotatably disposed, and a second driving groove is provided on the driving column. The distance between the first end of the second driving groove and the axis of the second driving member is less than the distance between the second end of the second driving groove and the axis of the second driving member. The femoral stem prosthesis also includes a second transmission rod, which passes through the second driving groove, and a second limiting member is connected to the second transmission rod.

[0012] Furthermore, the drive column is provided with a second clearance groove and a second mounting space. The second mounting space is located inside the second drive member. The second clearance groove is provided on the side wall of the second drive member. The second clearance groove communicates with the second drive groove through the second mounting space. The second limiting member passes through the second clearance groove. The connection between the second limiting member and the second transmission rod is located in the second mounting space. The second clearance groove is correspondingly provided with the second guide hole.

[0013] Furthermore, the femoral stem prosthesis also includes a connecting bolt, a first threaded hole on the support base, a second threaded hole on the end of the second drive member near the support base, and the connecting bolt is connected to the first threaded hole and the second threaded hole.

[0014] Furthermore, the support base includes a first base body; in the circumferential direction of the mounting cylinder, the relative position of the support base and the mounting cylinder is adjustable; the support base also includes multiple protrusions, which are sequentially arranged around the axis of the mounting cylinder at one end of the first base body near the mounting cylinder; the end of the mounting cylinder near the first base body is provided with multiple recesses; multiple receiving portions are sequentially arranged around the axis of the mounting cylinder; and the multiple recesses correspond one-to-one with the multiple protrusions; and / or, the support base also includes a second base body, a fixing cylinder is provided at the bottom of the first base body, the second base body is provided at the side of the first base body, and the support rod is adjustablely arranged on the second base body.

[0015] According to another aspect of the present invention, a hip joint prosthesis is provided, comprising a femoral stem prosthesis and an acetabular assembly, wherein the femoral stem prosthesis is the aforementioned femoral stem prosthesis, and the acetabular assembly is disposed on a support rod of the femoral stem prosthesis.

[0016] According to the technical solution of this invention, the femoral stem prosthesis includes a support assembly, a fixation cylinder, an installation cylinder, a first limiting member, and a first driving member. The support base supports a support rod, which in turn supports the acetabular assembly. The fixation cylinder passes through and is fixed within the medullary cavity, allowing the femoral stem prosthesis to be fixed to the bone structure. The first driving member drives the first limiting member to move, allowing it to move into or out of the receiving portion; that is, the first limiting member can switch between a clearance position and a limiting position. When the first limiting member is in the clearance position, the installation cylinder, the first limiting member, and the first driving member can be separated from the fixation cylinder, allowing them to be removed from the bone structure. This facilitates the removal of all structures of the femoral stem prosthesis except the fixation cylinder during a second-stage revision surgery. In this application, by using a femoral stem prosthesis in infection control to replace the bone cement spacer in related technologies, normal biomechanical activity of the hip joint can be maintained. Therefore, the technical solution of this application effectively solves the problem that bone cement spacers in related technologies cannot maintain normal biomechanical activity of the hip joint. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A three-dimensional structural schematic diagram of an embodiment of the femoral stem prosthesis according to the present invention is shown;

[0019] Figure 2 It shows Figure 1 A schematic diagram of the exploded structure of the femoral stem prosthesis;

[0020] Figure 3 It shows Figure 2 A magnified view of part A of the femoral stem prosthesis;

[0021] Figure 4 It shows Figure 2 A magnified schematic diagram of part B of the femoral stem prosthesis;

[0022] Figure 5 It shows Figure 1 A cross-sectional view of the first position of the femoral stem prosthesis;

[0023] Figure 6 It shows Figure 1 A cross-sectional view of the second position of the femoral stem prosthesis;

[0024] Figure 7 It shows Figure 6 A magnified view of part C of the femoral stem prosthesis;

[0025] Figure 8 It shows Figure 1 A three-dimensional structural diagram of the first body of the femoral stem prosthesis;

[0026] Figure 9 It shows Figure 1 A three-dimensional structural diagram of the second driving component and the second limiting component of the femoral stem prosthesis.

[0027] The above figures include the following reference numerals:

[0028] 1. Medullary cavity; 2. First cavity; 3. Second cavity;

[0029] 10. Support assembly; 11. Support base; 111. First threaded hole; 112. First seat body; 113. Protrusion; 114. Second seat body; 12. Support rod;

[0030] 20. Fixed cylinder; 21. Receiving part;

[0031] 30. Mounting cylinder; 31. First guide hole; 32. Recess;

[0032] 40. First limiting component;

[0033] 50. First driving component; 51. First driving groove; 52. First clearance groove; 53. First mounting space; 54. Driving cylinder;

[0034] 60. First transmission rod;

[0035] 70. Extension piece; 71. Extension tube; 711. Second guide hole;

[0036] 80. Second limiting component;

[0037] 90. Second driving component; 91. Drive column; 911. Second drive groove; 912. Second clearance groove; 913. Second mounting space; 92. Second threaded hole;

[0038] 100. Second transmission rod;

[0039] 110. Connecting bolts. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0042] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0043] like Figures 1 to 3 as well as Figure 5As shown, the femoral stem prosthesis of this embodiment includes: a support assembly 10, a fixation cylinder 20, an installation cylinder 30, a first limiting member 40, and a first driving member 50. The support assembly 10 includes a support base 11 and a support rod 12. The support rod 12 is disposed on the support base 11, and the axis of the support rod 12 forms an angle with the axis of the support base 11. The fixation cylinder 20 is disposed at the bottom of the support base 11, and a receiving portion 21 is provided on the inner wall of the fixation cylinder 20. The fixation cylinder 20 is used to pass through the medullary cavity 1. The installation cylinder 30 passes through the fixation cylinder 20, and a first guide hole 31 is provided on the installation cylinder 30. The first limiting member 40 is movably inserted into the first guide hole 31. The first limiting member 40 has a limiting position and a clearance position. When the first limiting member 40 is in the limiting position, part of the structure of the first limiting member 40 is located inside the receiving portion 21. When the first limiting member 40 is in the clearance position, the first limiting member 40 is located outside the receiving portion 21, so that the mounting cylinder 30 and the fixing cylinder 20 can be separated. The first driving member 50 is disposed inside the mounting cylinder 30. The first driving member 50 drives the first limiting member 40 to switch between the clearance position and the limiting position.

[0044] Using the technical solution of this embodiment, the femoral stem prosthesis includes a support assembly 10, a fixation cylinder 20, an installation cylinder 30, a first limiting member 40, and a first driving member 50. The support base 11 supports the support rod 12, and the support rod 12 supports the acetabular assembly. The fixation cylinder 20 passes through and is fixed within the medullary cavity 1, thus allowing the femoral stem prosthesis to be fixed to the bone structure via the fixation cylinder 20. The first driving member 50 can drive the first limiting member 40 to move, allowing the first limiting member 40 to move into or out of the receiving portion 21; that is, the first limiting member 40 can switch between an avoidance position and a limiting position. When the first limiting member 40 is in the avoidance position, the mounting cylinder 30, the first limiting member 40, and the first driving member 50 can be separated from the fixing cylinder 20. This allows the mounting cylinder 30, the first limiting member 40, and the first driving member 50 to be removed from the bone structure, facilitating the removal of the femoral stem prosthesis (excluding the fixing cylinder 20) from the bone structure during a second-stage revision surgery. In this embodiment, by using a femoral stem prosthesis to replace the bone cement spacer in related technologies during infection control, normal biomechanical activity of the hip joint can be maintained. Therefore, the technical solution of this embodiment effectively solves the problem that bone cement spacers in related technologies cannot maintain normal biomechanical activity of the hip joint.

[0045] It should be noted that the bone structure is the femur.

[0046] like Figure 3 as well as Figures 5 to 7As shown, in this embodiment, the first driving member 50 is rotatably configured, and a first driving groove 51 is provided on the first driving member 50. The distance between the first end of the first driving groove 51 and the axis of the first driving member 50 is less than the distance between the second end of the first driving groove 51 and the axis of the first driving member 50. The femoral stem prosthesis also includes a first transmission rod 60, which passes through the first driving groove 51. The first limiting member 40 is connected to the first transmission rod 60. When the first driving member 50 rotates, it can drive the first transmission rod 60 to move through the first driving groove 51, and then the first transmission rod 60 can drive the first limiting member 40 to move, so that the first limiting member 40 can switch between a limiting position and an avoidance position.

[0047] It should be noted that the first driving groove 51 is a first arc-shaped groove. When the first limiting member 40 switches from the avoidance position to the limiting position, the rotation direction of the first driving member 50 is from the first end of the first driving groove 51 to the second end of the first driving groove 51. When the first limiting member 40 switches from the limiting position to the avoidance position, the rotation direction of the first driving member 50 is from the second end of the first driving groove 51 to the first end of the first driving groove 51.

[0048] like Figure 2 , Figure 3 , Figure 6 as well as Figure 7 As shown, in this embodiment, the first driving member 50 is provided with a first clearance groove 52 and a first mounting space 53. The first mounting space 53 is located inside the first driving member 50, and the first clearance groove 52 is provided on the side wall of the first driving member 50. The first clearance groove 52 communicates with the first driving groove 51 through the first mounting space 53. The first limiting member 40 passes through the first clearance groove 52, and the connection between the first limiting member 40 and the first transmission rod 60 is located in the first mounting space 53. The first clearance groove 52 is correspondingly provided with the first guide hole 31. The first transmission rod 60 can pass through the first clearance groove 52 into the first mounting space 53, and thus the first transmission rod 60 can be installed into the first driving groove 51.

[0049] It should be noted that when installing the first transmission rod 60 into the first drive groove 51, the first transmission rod 60 can be connected to the first limiting member 40 first, and then the first transmission rod 60 can be installed into the first drive groove 51.

[0050] like Figure 1 , Figure 2 , Figure 4 , Figure 6 as well as Figure 9As shown, in this embodiment, the femoral stem prosthesis further includes an extension member 70 and a second limiting member 80. The extension member 70 is located at the end of the first driving member 50 away from the support base 11, and the axis of the extension member 70 is parallel to the rotation axis of the first driving member 50. The second limiting member 80 is disposed on the extension member 70 and has an extended position extending out of the extension member 70 and a retracted position. The extension member 70 is disposed within the medullary cavity 1, which allows the femoral stem prosthesis to be more stably placed on the bone structure. When the second limiting member 80 is in the extended position, the contact area between the second limiting member 80 and the bone cement in the medullary cavity 1 can be increased, thereby making the relative positions between the extension member 70 and the bone structure, and between the second limiting member 80 and the bone structure, more stable. When the second limiting member 80 is in the retracted position, the second limiting member 80 does not protrude from the extension member 70, which facilitates the extension member 70 and the second limiting member 80 passing through the fixing cylinder 20 and being installed into the medullary cavity 1.

[0051] It should be noted that the medullary cavity 1 includes a first cavity 2 and a second cavity 3. The fixation cylinder 20 is disposed within the first cavity 2, and the extension member 70 is disposed within the second cavity 3. The inner diameter of the second cavity 3 is smaller than the inner diameter of the first cavity 2, and smaller than or equal to the diameter of the inner surface of the fixation cylinder 20. Bone cement is disposed within the second cavity 3, which can fix the relative positions of the extension member 70 and the bone structure, as well as the second limiting member 80 and the bone structure. Bone cement may also be disposed within the first cavity 2, with the bone cement located between the surface of the first cavity 2 and the fixation cylinder 20, allowing the fixation cylinder 20 to be more stably fixed within the first cavity 2.

[0052] The diameter of the extension 70 is smaller than the diameter of the inner surface of the fixed cylinder 20.

[0053] The outer surface of the extension 70 may be provided with a bone cement groove and multiple concave surfaces to increase the bonding force with the bone cement.

[0054] like Figure 1 , Figure 2 , Figure 4 , Figure 6 as well as Figure 9 As shown, in this embodiment, a plane perpendicular to the axis of the extension member 70 is defined as a preset plane. When the second limiting member 80 is in the extended position, the area enclosed by the projection of the second limiting member 80 onto the preset plane is the first projection area, and the area enclosed by the projection of the inner surface of the fixing cylinder 20 onto the preset plane is the second projection area. The first projection area is located within the second projection area. Through this configuration, the inner surface of the fixing cylinder 20 will not interfere with the second limiting member 80, facilitating the removal of the extension member 70 and the second limiting member 80.

[0055] When removing the femoral stem prosthesis except for the fixation sleeve 20, the second limiting member 80 can bring out the bone cement in the second cavity 3, facilitating subsequent revision surgery to implant a new prosthesis. Therefore, when removing the femoral stem prosthesis, it is not necessary to switch the second limiting member 80 to the retracted position.

[0056] like Figure 1 , Figure 2 , Figure 3 as well as Figure 5 As shown, in this embodiment, the extension member 70 includes an extension cylinder 71, the first drive member 50 includes a drive cylinder 54, and the femoral stem prosthesis also includes a second drive member 90. The second drive member 90 is adjustablely disposed within the drive cylinder 54 and the extension cylinder 71. The extension cylinder 71 is provided with a second guide hole 711, and a second limiting member 80 is disposed within the second guide hole 711. The second drive member 90 and the second limiting member 80 drive each other to extend the second limiting member 80 through the second guide hole 711 and out of the extension cylinder 71. The second drive member 90 can drive the second limiting member 80 to move, thereby allowing the second limiting member 80 to extend the second limiting member 80 through the second guide hole 711 and out of the extension cylinder 71, that is, the second limiting member 80 can switch from a retracted position to an extended position.

[0057] like Figure 2 , Figure 4 , Figure 6 as well as Figure 9 As shown, in this embodiment, the second driving member 90 includes a driving column 91, which is rotatably disposed. A second driving groove 911 is provided on the driving column 91. The distance between the first end of the second driving groove 911 and the axis of the second driving member 90 is less than the distance between the second end of the second driving groove 911 and the axis of the second driving member 90. The femoral stem prosthesis also includes a second transmission rod 100, which passes through the second driving groove 911. A second limiting member 80 is connected to the second transmission rod 100. Rotation of the driving column 91 can drive the second transmission rod 100 to move through the second driving groove 911, allowing the second transmission rod 100 to drive the second limiting member 80 to move, thereby allowing the second limiting member 80 to switch from a retracted position to an extended position.

[0058] It should be noted that the second drive groove 911 is a second arc-shaped groove. When the second limiting member 80 switches from the retracted position to the extended position, the rotation direction of the second drive member 90 is from the first end of the second drive groove 911 to the second end of the second drive groove 911.

[0059] like Figure 1 , Figure 2 , Figure 4 , Figure 6 as well as Figure 9As shown, in this embodiment, the drive column 91 is provided with a second clearance groove 912 and a second mounting space 913. The second mounting space 913 is located inside the second drive member 90. The second clearance groove 912 is provided on the side wall of the second drive member 90 and communicates with the second drive groove 911 through the second mounting space 913. The second limiting member 80 passes through the second clearance groove 912, and the connection between the second limiting member 80 and the second transmission rod 100 is located in the second mounting space 913. The second clearance groove 912 is correspondingly provided with the second guide hole 711. The second transmission rod 100 can pass through the second clearance groove 912 and enter the second mounting space 913, thereby allowing the second transmission rod 100 to be installed in the second drive groove 911.

[0060] It should be noted that when installing the second transmission rod 100 into the second drive groove 911, the second transmission rod 100 can be connected to the second limiting member 80 first, and then the second transmission rod 100 can be installed into the second drive groove 911.

[0061] The first limiting member 40 includes a first limiting rod, which includes a first rod body and a second rod body detachably connected to the first rod body. The first rod body is connected between the second rod body and the first transmission rod. When installing the first limiting member, the first rod body and the first transmission rod are first installed together to the first driving member, and then the second rod body is passed through the first guide hole and connected to the first rod body.

[0062] The second limiting member 80 includes a second limiting rod, which includes a third rod body and a fourth rod body detachably connected to the third rod body. The third rod body is connected between the fourth rod body and the second transmission rod. When installing the second limiting member, the third rod body and the second transmission rod are first installed together to the second driving member, and then the fourth rod body is passed through the second guide hole and connected to the third rod body.

[0063] like Figure 1 , Figure 2 , Figure 5 as well as Figure 8As shown, in this embodiment, the femoral stem prosthesis also includes a connecting bolt 110. A first threaded hole 111 is provided on the support base 11, and a second threaded hole 92 is provided at one end of the second drive member 90 near the support base 11. The connecting bolt 110 is connected within the first threaded hole 111 and the second threaded hole 92. Through the above arrangement, the connecting bolt 110 can connect the support base 11 and the second drive member 90. The connecting bolt 110 can apply a pulling force toward the support base 11 to the second driving member 90. The second driving member 90 can apply a pulling force toward the support base 11 to the extension member 70 through the second transmission rod 100 and the second limiting member 80. Since the end faces of the first driving member 50 and the extension member 70 are fitted together, the extension member 70 can apply a pulling force toward the support base 11 to the first driving member 50. This allows the first driving member 50 to apply a pulling force toward the support base 11 to the mounting cylinder 30 through the first transmission rod 60 and the first limiting member 40. The first limiting member 40 can apply a pulling force toward the support base 11 to the fixing cylinder 20. This achieves the connection between the support base 11, the mounting cylinder 30, the fixing cylinder 20, the first driving member 50, the extension member 70, and the second driving member 90, making the relative positions between the support base 11, the mounting cylinder 30, the fixing cylinder 20, the first driving member 50, the extension member 70, and the second driving member 90 more stable.

[0064] like Figure 1 , Figure 2 , Figure 4 , Figure 6 as well as Figure 9 As shown, in this embodiment, the relative position of the support base 11 and the mounting cylinder 30 is adjustable in the circumferential direction of the mounting cylinder 30. The support base 11 includes a first base 112 and a plurality of protrusions 113. The plurality of protrusions 113 are sequentially arranged around the axis of the mounting cylinder 30 at one end of the first base 112 near the mounting cylinder 30. The mounting cylinder 30 has a plurality of recesses 32 at one end near the first base 112. A plurality of receiving portions 21 are sequentially arranged around the axis of the mounting cylinder 30. The plurality of recesses 32 correspond one-to-one with the plurality of protrusions 113. By setting the plurality of protrusions 113 and the plurality of recesses 32, the relative position between the first base 112 and the mounting cylinder 30 can be stabilized after the relative position of the first base 112 and the mounting cylinder 30 is adjusted in the circumferential direction of the mounting cylinder 30. That is, the relative position between the first base 112 and the mounting cylinder 30 can be stabilized after the internal and external rotation angle of the femoral stem prosthesis is adjusted.

[0065] like Figure 1 , Figure 2 as well as Figure 4As shown, in this embodiment, the support base 11 includes a first base 112 and a second base 114. The fixing cylinder 20 is disposed at the bottom of the first base 112, and the second base 114 is disposed on the side of the first base 112. The support rod 12 is adjustablely disposed on the second base 114. When installing the femoral stem prosthesis, the relative position between the support rod 12 and the second base 114 can be adjusted according to the installation position of the acetabular assembly, which facilitates the installation of the acetabular assembly.

[0066] The extension member 70 includes an extension cylinder 71, the first drive member 50 includes a drive cylinder 54, and the femoral stem prosthesis also includes a second drive member 90. The second drive member 90 is adjustablely inserted into the drive cylinder 54 and the extension cylinder 71, and the end faces of the first drive member 50 and the extension member 70 are fitted together. Because the end faces of the first drive member 50 and the extension member 70 are fitted together, when the first drive member 50 is rotated, the first drive member 50 can rotate relative to the extension member 70, and the extension member 70 will not interfere with the rotation of the first drive member 50.

[0067] The second base is provided with a first anti-rotation tooth and the support rod is provided with a second anti-rotation tooth. The first anti-rotation tooth and the second anti-rotation tooth engage in anti-rotation cooperation, which enables the relative position between the support rod and the second base to remain stable after the support rod swings.

[0068] The femoral stem prosthesis also includes a fixing bolt, which passes through the second seat and the support rod so that after the support rod swings, the fixing bolt connects the support rod and the second seat, so that the first anti-rotation tooth abuts against the second anti-rotation tooth.

[0069] In this embodiment, during the implantation of the femoral stem prosthesis, the extension member 70, the second limiting member 80, the second transmission rod 100, and the second driving member 90 are assembled. The second driving member 90 then moves the second limiting member 80, causing it to switch to the extended position. Next, the mounting cylinder 30, the first limiting member 40, the first transmission rod 60, and the first driving member 50 are assembled and installed onto the second driving member 90. The first driving member 50 then moves the first limiting member 40, causing it to switch to the limited position. Finally, the support base 11 and the support rod 12 are assembled. The support assembly 10 is then installed above the fixing cylinder 20, the mounting cylinder 30, the first driving member 50, and the second driving member 90, and a connecting bolt 110 is installed, connecting the support base 11 and the second driving member 90.

[0070] When the second limiting member 80 switches from the retracted position to the extended position, the rotation direction of the second driving member 90 is the first direction. When the connecting bolt 110 is used to connect the support base 11 and the second driving member 90, the rotation direction of the connecting bolt 110 is the second direction, and the first direction and the second direction are the same. This can prevent the first driving member 50 from rotating due to the rotation of the connecting bolt 110 during installation, thus avoiding the second limiting member 80 switching from the extended position to the retracted position.

[0071] When removing the femoral stem prosthesis, remove all structures except the fixation sleeve 20. First, rotate the connecting bolt 110 to remove it, and then remove the support assembly 10. Next, rotate the first drive member 50 to switch the first limiting member 40 from the limiting position to the avoidance position, and then remove the mounting sleeve 30, the first limiting member 40, the first drive member 50, the first transmission rod 60, the extension member 70, the second limiting member 80, the second drive member 90, and the second transmission rod 100.

[0072] The hip joint prosthesis of this embodiment includes a femoral stem prosthesis and an acetabular assembly. The femoral stem prosthesis is the one described above, and the acetabular assembly is mounted on the support rod 12 of the femoral stem prosthesis. In this embodiment, by using the femoral stem prosthesis during infection control to replace the bone cement spacer in related technologies, normal biomechanical activity of the hip joint can be maintained. The hip joint prosthesis with the aforementioned femoral stem prosthesis also has the advantages described above.

[0073] It should be noted that the acetabular assembly includes an acetabular cup and a ball head, with the ball head located inside the acetabular cup and mounted on the support rod 12.

[0074] When selecting materials for the femoral stem prosthesis, high-strength and wear-resistant biocompatible materials are preferred, including titanium alloys, cobalt-chromium-molybdenum composites, and ceramic composites. These materials possess excellent mechanical properties and corrosion resistance, can withstand human activity, and reduce the risk of wear and fatigue fracture. When selecting materials for the acetabular cup, ultra-high cross-linked polyethylene is preferred due to its good biocompatibility, which reduces the risk of prosthesis loosening, displacement, and wear. When selecting materials for the ball head, high-strength and wear-resistant biocompatible materials are chosen, including ceramics, ultra-high cross-linked polyethylene, titanium alloys, and cobalt-chromium-molybdenum composites, which possess excellent mechanical properties and corrosion resistance.

[0075] In the infection stage following hip replacement surgery, a 1.5-stage revision surgery is required to remove the original prosthesis and implant the hip joint prosthesis of this embodiment. This hip joint prosthesis of this embodiment can occupy space during the treatment phase, prevent bone loss around the prosthesis, and provide good fixation for the patient, avoiding muscle contracture. Furthermore, the first limiting component 40 facilitates the removal of the femoral stem prosthesis during a second replacement, simplifying the number of prosthetic components required during the treatment phase and improving the treatment efficiency for post-hip replacement infection.

[0076] In the description of this invention, it should be understood that "a plurality of" means two or more. Directional terms such as "front, back, up, down, left, right," "horizontal, vertical, perpendicular, horizontal," and "top, bottom" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the outline of each component itself.

[0077] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0078] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0079] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. In particular, unless there is a clear contradiction or logical conflict in the context, any technical feature in any embodiment disclosed in this specification can be arbitrarily combined with other technical features in any one or more other embodiments to form a new technical solution. All possible variations formed by combining different features, which can be conceived by those skilled in the art based on the technical teachings provided by the present invention, should be considered as fully disclosed in this specification, and these combinations also fall within the scope of protection claimed by the present invention.

Claims

1. A femoral stem prosthesis, characterized in that, include: The support assembly (10) includes a support base (11) and a support rod (12). The support rod (12) is disposed on the support base (11), and the axis of the support rod (12) and the axis of the support base (11) are arranged at an angle. A fixing cylinder (20) is provided at the bottom of the support base (11), and a receiving part (21) is provided on the inner wall of the fixing cylinder (20). The fixing cylinder (20) is used to be inserted into the medullary cavity. The mounting cylinder (30) is inserted inside the fixed cylinder (20), and the mounting cylinder (30) is provided with a first guide hole (31). The first limiting member (40) is movably inserted into the first guide hole (31). The first limiting member (40) has a limiting position and a clearance position. When the first limiting member (40) is in the limiting position, part of the structure of the first limiting member (40) is located in the receiving part (21). When the first limiting member (40) is in the clearance position, the first limiting member (40) is located outside the receiving part (21) so that the mounting cylinder (30) and the fixing cylinder (20) can be separated. A first driving member (50) is disposed inside the mounting cylinder (30). The first driving member (50) drives and cooperates with the first limiting member (40) to switch the first limiting member (40) between the avoidance position and the limiting position.

2. The femoral stem prosthesis according to claim 1, characterized in that, The first driving member (50) is rotatably disposed, and a first driving groove (51) is provided on the first driving member (50). The distance between the first end of the first driving groove (51) and the axis of the first driving member (50) is less than the distance between the second end of the first driving groove (51) and the axis of the first driving member (50). The femoral stem prosthesis also includes a first transmission rod (60), which passes through the first driving groove (51). The first limiting member (40) is connected to the first transmission rod (60).

3. The femoral stem prosthesis according to claim 2, characterized in that, The first drive member (50) is provided with a first clearance groove (52) and a first mounting space (53). The first mounting space (53) is located inside the first drive member (50). The first clearance groove (52) is provided on the side wall of the first drive member (50). The first clearance groove (52) communicates with the first drive groove (51) through the first mounting space (53). The first limiting member (40) passes through the first clearance groove (52). The connection between the first limiting member (40) and the first transmission rod (60) is located in the first mounting space (53). The first clearance groove (52) is correspondingly provided with the first guide hole (31).

4. The femoral stem prosthesis according to claim 1, characterized in that, The femoral stem prosthesis also includes an extension (70) and a second limiting member (80). The extension (70) is located at the end of the first drive member (50) away from the support base (11). The axis of the extension (70) is parallel to the rotation axis of the first drive member (50). The second limiting member (80) is disposed on the extension (70) and has an extended position extending out of the extension (70) and a retracted position retracted out of the extension (70).

5. The femoral stem prosthesis according to claim 4, characterized in that, A plane perpendicular to the axis of the extension member (70) is set as a preset plane. When the second limiting member (80) is in the extended position, the area enclosed by the projection of the second limiting member (80) on the preset plane is the first projection area, and the area enclosed by the projection of the inner surface of the fixing cylinder (20) on the preset plane is the second projection area. The first projection area is located within the second projection area.

6. The femoral stem prosthesis according to claim 4, characterized in that, The extension member (70) includes an extension tube (71), the first drive member (50) includes a drive tube (54), and the femoral stem prosthesis also includes a second drive member (90). The second drive member (90) is adjustablely inserted into the drive tube (54) and the extension tube (71). The extension tube (71) is provided with a second guide hole (711), and the second limiting member (80) is inserted into the second guide hole (711). The second drive member (90) and the second limiting member (80) drive each other to cooperate so that the second limiting member (80) passes through the second guide hole (711) and extends out of the extension tube (71).

7. The femoral stem prosthesis according to claim 6, characterized in that, The second driving member (90) includes a driving column (91) which is rotatably disposed. A second driving groove (911) is provided on the driving column (91). The distance between the first end of the second driving groove (911) and the axis of the second driving member (90) is less than the distance between the second end of the second driving groove (911) and the axis of the second driving member (90). The femoral stem prosthesis also includes a second transmission rod (100) which passes through the second driving groove (911). The second limiting member (80) is connected to the second transmission rod (100).

8. The femoral stem prosthesis according to claim 7, characterized in that, The drive column (91) is provided with a second clearance groove (912) and a second mounting space (913). The second mounting space (913) is located inside the second drive member (90). The second clearance groove (912) is provided on the side wall of the second drive member (90). The second clearance groove (912) communicates with the second drive groove (911) through the second mounting space (913). The second limiting member (80) passes through the second clearance groove (912). The connection between the second limiting member (80) and the second transmission rod (100) is located in the second mounting space (913). The second clearance groove (912) is correspondingly provided with the second guide hole (711).

9. The femoral stem prosthesis according to claim 6, characterized in that, The femoral stem prosthesis also includes a connecting bolt (110), a first threaded hole (111) is provided on the support base (11), and a second threaded hole (92) is provided at one end of the second drive member (90) near the support base (11). The connecting bolt (110) is connected in the first threaded hole (111) and the second threaded hole (92).

10. The femoral stem prosthesis according to any one of claims 1 to 9, characterized in that, The support base (11) includes a first base body (112); In the circumferential direction of the mounting cylinder (30), the relative position of the support base (11) and the mounting cylinder (30) is adjustable. The support base (11) also includes a plurality of protrusions (113). The plurality of protrusions (113) are arranged sequentially around the axis of the mounting cylinder (30) at one end of the first seat body (112) near the mounting cylinder (30). The mounting cylinder (30) is provided with a plurality of recesses (32) at one end near the first seat body (112). The plurality of receiving portions (21) are arranged sequentially around the axis of the mounting cylinder (30). The plurality of recesses (32) and the plurality of protrusions (113) are arranged one-to-one. And / or, the support base (11) further includes a second base (114), the fixing cylinder (20) is disposed at the bottom of the first base (112), the second base (114) is disposed at the side of the first base (112), and the support rod (12) is adjustablely disposed on the second base (114).

11. A hip joint prosthesis, comprising a femoral stem prosthesis and an acetabular assembly, characterized in that, The femoral stem prosthesis is the femoral stem prosthesis according to any one of claims 1 to 10, and the acetabular assembly is disposed on the support rod (12) of the femoral stem prosthesis.

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