Extramedullary axial compression fixation of femoral prosthesis

Abstract

The present application relates to the technical field of orthopedic implants, and in particular to an extramedullary axially pressurized and fixed femoral prosthesis, the technical solution of which mainly comprises a medullary cavity handle and a defective segment, wherein a temporary pressurizing rod is arranged at one end of the medullary cavity handle away from the defective segment; a first fixing member is arranged on the medullary cavity handle for locking the medullary cavity handle after the medullary cavity handle is pressurized; when the femoral prosthesis is replaced, the diseased bone is firstly removed, and then the medullary cavity handle is inserted into the medullary cavity of the retained bone located above the removed portion, until the end face of the defective segment close to the medullary cavity handle is fitted with the osteotomy surface of the retained bone, and the defective segment is connected to the retained bone, and then an upward force is applied to the temporary pressurizing rod to drive the medullary cavity handle to move upward, and finally the medullary cavity handle is locked by the first fixing member; such a design enables the end face of the defective segment close to the medullary cavity handle to apply continuous pressure to the end face of the retained bone, thereby promoting bone ingrowth and making the connection between the two more stable in the early postoperative period.

Description

Technical Field

[0001] The present application relates to the technical field of orthopedic implants, and in particular to an extramedullary axial compression-fixed femoral prosthesis. Background Art

[0002] The femur is the longest tubular bone in the human body. The upper end of the femoral head and acetabulum form the hip joint, and the lower end, patella and upper end of the tibia form the knee joint, supporting the body weight.

[0003] When a tumor or other lesions occur in the human femur, it is usually necessary to surgically remove the diseased bone on the femur, and then use a femoral prosthesis to replace the removed diseased bone; the femoral prosthesis includes a medullary stem and a defect segment integrally formed with the medullary stem, and the end face of the defect segment close to the medullary stem and the surface of the medullary stem are coated to promote bone ingrowth; when prosthesis replacement is required, the medullary stem is first inserted into the medullary cavity of the retained bone, and the end face of the defect segment close to the medullary stem is fit with the end face of the retained bone, and then the defect segment is connected to the retained bone, and finally an auxiliary fixation steel plate that fits the outer surface of the retained bone is arranged on the outside of the retained bone, and screws are used to connect the auxiliary fixation steel plate to the retained bone and the auxiliary fixation steel plate to the defect segment.

[0004] With respect to the above-mentioned related technical solutions, the inventors found that: since the end face of the defect segment close to the medullary cavity stem and the end face of the femur are only in a contact and fitting state, although the end face of the defect segment close to the medullary cavity stem can now be coated, the coating includes but is not limited to 3D printed trabecular porous structure, titanium / tantalum spray coating, hydroxyapatite coating, etc., to promote bone ingrowth and thus achieve long-term fixation, the defect segment and the retained bone will still fail to heal and have difficulty in bone ingrowth due to slight displacements during bone healing or interface integration, which will greatly prolong the postoperative recovery time. Summary of the invention

[0005] In order to exert a continuous interactive pressure between the defect segment and the retained bone, thereby promoting bone ingrowth and making the connection between the defect segment and the retained bone more stable in the early postoperative period, the present application provides an extramedullary axial compression fixation femoral prosthesis.

[0006] The extramedullary axial compression fixation femoral prosthesis provided in this application adopts the following technical solution:

[0007] An extramedullary axially pressurized and fixed femoral prosthesis comprises a medullary stem and a defective section. A temporary pressurizing rod is arranged at one end of the medullary stem away from the defective section. A first fixing member is arranged on the medullary stem for locking the medullary stem after the medullary stem is pressurized.

[0008] By adopting the above technical scheme, when it is necessary to replace the femoral prosthesis, the diseased bone is first removed, and then the medullary stem is inserted into the medullary cavity of the retained bone until the end face of the defective segment close to the medullary stem is close to the end face of the retained bone, and the defective segment is connected to the retained bone, and then an upward force is applied to the temporary pressure rod to drive the medullary stem to move upward, and finally the medullary stem is fixed by the first fixing member; such a design enables the end face of the defective segment close to the medullary stem to apply pressure to the end face of the retained bone, so that there is a compression force between the end face of the defective segment close to the medullary stem and the cross section of the retained bone. On the one hand, the defective segment and the retained bone can be connected more firmly in the early postoperative period; on the other hand, the mutual pressure between the end face of the defective segment close to the medullary stem and the cross section of the retained bone achieves the effect of promoting bone ingrowth.

[0009] Preferably, one end of the temporary pressure rod close to the medullary cavity handle is detachably connected to the medullary cavity handle.

[0010] By adopting the above technical solution, since the operation needs to be performed inside the human body and the operating space is limited, the temporary pressure rod and the medullary cavity handle are detachably connected to facilitate the separation of the temporary pressure rod and the medullary cavity handle after the temporary pressure rod drives the medullary cavity handle to move, thereby ensuring the normal progress of the operation.

[0011] Preferably, one end of the temporary pressure rod away from the medullary cavity handle is connected to a first force applying cap.

[0012] By adopting the above technical solution, when it is necessary to move the medullary handle upward due to limited operating space, the first force cap provided facilitates the surgeon to apply force to the temporary pressure rod between the first force cap and the retained bone, thereby driving the medullary handle upward, thereby improving the convenience of surgical operation.

[0013] Preferably, the temporary pressure rod is provided with a second force cap sliding along the axis of the temporary pressure rod, and the second force cap has a fitting block at one end away from the first force cap, and the fitting block has a surface corresponding to the outer surface contour of the retained bone.

[0014] By adopting the above technical solution, since the operating space is limited, when it is necessary to move the medullary cavity handle upward, the surgeon can place the expander between the first force cap and the second force cap, and then apply force to the expander, thereby driving the medullary cavity handle to move upward, greatly improving the convenience of the surgical operation; the provided fitting block reduces the damage to the retained bone caused by the expander when applying force to the first force cap and the second force cap.

[0015] Preferably, a guide plate is provided on one side of the medullary cavity handle and the defect segment, and a first guide hole is provided on the side of the guide plate away from the medullary cavity handle for the first fixing member to extend into the retained bone; a positioning block is integrally formed on the side of the guide plate close to the defect segment, and a positioning groove is provided in the defect segment for placing the positioning block.

[0016] By adopting the above technical solution, since the length of the medullary shank is determined, the position of the fixing hole is determined, and since the length of the guide plate is determined, the position of the first guide hole is also determined. Therefore, in order to ensure that the fixing screw can be accurately screwed into the fixing hole, it is only necessary to place the positioning block in the positioning groove to achieve the limitation of the guide plate, so that the fixing screw can be accurately screwed into the fixing hole. Such a design greatly improves the convenience of surgical operation.

[0017] Preferably, the defect segment includes a first part arranged close to the medullary cavity handle and a second part arranged on the side of the first part away from the medullary cavity handle, the outer diameter of the first part is larger than the outer diameter of the second part; the second part is sleeved with a fixing cap, and the fixing cap and the guide plate are integrally formed; a second fixing member is arranged at one end of the fixing cap away from the first part; the second fixing member includes a threaded rod and a limiting cap arranged on the side of the threaded rod away from the first part, and a threaded hole for the threaded rod to be screwed into is provided on the end surface of the second part away from the first part; the outer diameter of the limiting cap is larger than the outer diameter of the second part.

[0018] By adopting the above technical solution, when the fixing screw needs to be accurately screwed into the fixing hole, it is first necessary to put the fixing cap on the second part and place the positioning block in the positioning groove at the same time, and then screw the screw into the second part until the limiting cap abuts against the end face of the second part away from the first part. This design avoids the need to hold the guide plate all the time to screw the fixing screw into the fixing hole, which greatly improves the convenience of surgical operation.

[0019] Preferably, a guide tube is provided on the side of the guide plate away from the medullary cavity handle, and a second guide hole coaxial with the first guide hole is provided in the guide tube.

[0020] By adopting the above technical solution, when the fixing screw needs to be accurately inserted into the fixing hole, the fixing screw is inserted into the fixing hole through the guide tube. This design reduces the possibility of the fixing screw being offset when the fixing screw is screwed in the direction close to the fixing hole, thereby ensuring that the fixing screw can be accurately screwed into the fixing hole.

[0021] Preferably, a sleeve core is threadedly connected to one side of the guide tube away from the guide plate, and a third guide hole coaxial with the second guide hole is formed in the sleeve core, and the inner diameter of the third guide hole is smaller than the inner diameter of the second guide hole; a through hole is formed along the axis of the fixing screw.

[0022] By adopting the above technical solution, when the fixing screw needs to be accurately inserted into the fixing hole, first, a guide pin or a metal drill bit smaller than the inner diameter of the third guide hole is driven into the fixing hole through the sleeve core and the guide tube, and then the sleeve core is separated from the guide tube, and then the fixing screw is sleeved on the guide pin and screwed in the direction close to the fixing hole, thereby realizing the connection between the medullary cavity handle and the retained bone. This design further reduces the possibility of the fixing screw being offset when the fixing screw is screwed in the direction close to the fixing hole, thereby further ensuring that the fixing screw can be accurately screwed into the fixing hole.

[0023] Preferably, an auxiliary fixation plate is provided on one side of the medullary cavity handle and the defect segment, and the auxiliary fixation plate has a surface corresponding to the outer contour of the retained bone; the auxiliary fixation plate is provided with a first auxiliary screw passing through the auxiliary fixation plate and the defect segment and a second auxiliary screw passing through the auxiliary fixation plate and the medullary cavity handle.

[0024] By adopting the above technical solution, after the medullary stem and the retained bone are connected, the auxiliary fixation plate is attached to the outer surface of the retained bone, and then the first auxiliary screw is screwed into the defect segment, and the second auxiliary screw is screwed into the retained bone, thereby achieving the connection between the defect segment and the retained bone, thereby ensuring the connection strength between the femoral prosthesis and the retained bone.

[0025] Preferably, the auxiliary fixing steel plate is provided with a plurality of auxiliary holes for the first auxiliary screws and the second auxiliary screws to be screwed into.

[0026] By adopting the above technical solution, the multiple auxiliary holes opened improve the selectivity and reduce the damage of the first auxiliary screw and the second auxiliary screw to the retained bone, so that the first auxiliary screw and the second auxiliary screw can better achieve the connection between the femoral prosthesis and the retained bone.

[0027] In summary, this application has the following technical effects:

[0028] 1. When a femoral prosthesis needs to be replaced, the diseased bone is first removed, and then the intramedullary stem is inserted into the intramedullary cavity of the retained bone until the end surface of the defective segment close to the intramedullary stem fits with the end surface of the retained bone, and the defective segment is connected to the retained bone, and then an upward force is applied to the temporary pressure rod to drive the intramedullary stem to move upward, and finally the intramedullary stem is fixed by the first fixing member; such a design enables the end surface of the defective segment close to the intramedullary stem to apply pressure to the end surface of the retained bone, so that there is a compression force between the end surface of the defective segment close to the intramedullary stem and the cross section of the retained bone, on the one hand, the defective segment and the retained bone can be connected more firmly in the early postoperative period; on the other hand, the mutual pressure between the end surface of the defective segment close to the intramedullary stem and the cross section of the retained bone achieves the effect of promoting bone ingrowth;

[0029] 2. Due to the limited operating space, when the medullary canal handle needs to be moved upward, the surgeon can place the spreader between the first force cap and the second force cap, and then apply force to the spreader to move the medullary canal handle upward, which greatly improves the convenience of surgical operation;

[0030] 3. When the fixing screw needs to be accurately inserted into the fixing hole, first, a guide pin smaller than the inner diameter of the third guide hole is driven into the fixing hole through the sheath core and the guide tube, and then the sheath core is separated from the guide tube, and then the fixing screw is sleeved on the guide pin and screwed in the direction close to the fixing hole, thereby realizing the connection between the medullary handle and the retained bone. This design further reduces the possibility of the fixing screw being offset when the fixing screw is screwed in the direction close to the fixing hole, thereby further ensuring that the fixing screw can be accurately screwed into the fixing hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic diagram of the structure after the retained bone is connected to the femoral prosthesis in an embodiment of the present application;

[0032] Figure 2 It is a schematic structural diagram of the connection between the femoral prosthesis and the temporary pressure rod after the hidden bone retention in the embodiment of the present application;

[0033] Figure 3 It is a schematic structural diagram of the connection between the femoral prosthesis and the guide assembly after the femoral prosthesis is hidden and retained in the embodiment of the present application;

[0034] Figure 4 It is a schematic diagram of the structure in which the bolt rod is connected to the second part after the fixing cap is hidden in the embodiment of the present application.

[0035] In the figure, 1. retained bone; 2. femoral prosthesis; 21. medullary stem; 22. defect segment; 221. first part; 2211. positioning groove; 222. second part; 3. first fixing piece; 31. fixing screw; 4. traction assembly; 41. temporary pressure rod; 42. first force cap; 43. second force cap; 44. fitting block; 5. guide assembly; 51. guide plate; 52. positioning block; 53. fixing cap; 54. second fixing piece; 541. threaded rod; 542. limiting cap; 55. guide tube; 56. sleeve core; 6. auxiliary fixing plate; 61. auxiliary hole; 7. first auxiliary screw. DETAILED DESCRIPTION

[0036] The present application is further described in detail below in conjunction with the accompanying drawings.

[0037] Reference Figure 1 and Figure 2The present application provides an extramedullary axial compression fixation femoral prosthesis for replacing the resected diseased bone. The femoral prosthesis 2 includes a medullary cavity handle 21 and a defective segment 22 inserted into the medullary cavity of the retained bone 1. The medullary cavity handle 21 and the defective segment 22 are integrally formed. The end surface of the defective segment 22 close to the medullary cavity handle 21 and the surface of the medullary cavity handle 21 are both coated to promote bone ingrowth. A traction assembly 4 is provided at one end of the medullary cavity handle 21 away from the defective segment 22. The traction assembly 4 includes a temporary compression rod 41 which is detachably connected to one end of the medullary cavity handle 21 away from the defective segment 22. In the embodiment of the present application, the temporary compression rod 41 is threadedly connected to the medullary cavity handle 21. Of course, in other examples, the temporary compression rod 41 is threadedly connected to the medullary cavity handle 21. 41 and the medullary cavity handle 21 only need to be detachably connected; the temporary pressure rod 41 extends to the outside of the retained bone 1 at one end away from the medullary cavity handle 21; a thread is provided on the circumferential surface of the end of the temporary pressure rod 41 close to the medullary cavity handle 21, and a threaded hole for the temporary pressure rod 41 to be screwed in is provided at the end of the medullary cavity handle 21 close to the temporary pressure rod 41; a plurality of first fixing members 3 for fixing the medullary cavity handle 21 are provided on the medullary cavity handle 21. In the embodiment of the present application, the first fixing member 3 adopts a fixing screw 31, and two of them are provided. A fixing hole for inserting the fixing screw 31 is provided on the medullary cavity handle 21. In other examples, the first fixing member 3 can also adopt a fixing rod or a fixing block, and at least one can be provided.

[0038] When it is necessary to replace the femoral prosthesis 2, the diseased bone is first surgically removed, and then a socket for inserting the intramedullary stem 21 is opened in the intramedullary cavity of the retained bone 1, and the intramedullary stem 21 is inserted into the intramedullary cavity of the retained bone 1 along the extension direction of the socket, until it moves to the point where the end face of the defective segment 22 close to the intramedullary stem 21 fits with the end face of the retained bone 1, and then the defective segment 22 is connected to the prosthesis located below the removed portion by a taper connection, and then the temporary pressure rod 41 is screwed into the intramedullary stem 21 through the socket, and an upward force is applied to the temporary pressure rod 41 to drive the intramedullary stem 21 to move upward, so that the end face of the defective segment 22 close to the intramedullary stem 21 can apply pressure to the end face of the retained bone 1, thereby generating a compression force between the end face of the defective segment 22 close to the intramedullary stem 21 and the cross-section of the retained bone 1. The design, on the one hand, enables the defect segment 22 and the retained bone 1 to be more firmly connected in the early postoperative period; on the other hand, the mutual pressure between the end face of the defect segment 22 close to the medullary cavity handle 21 and the cross section of the retained bone 1 promotes bone ingrowth, thereby shortening the postoperative recovery time and alleviating the patient's pain; finally, the fixing screw 31 is inserted into the retained bone 1 to achieve the connection between the medullary cavity handle 21 and the retained bone 1, so that the end face of the defect segment 22 close to the medullary cavity handle 21 can always exert pressure on the end face of the retained bone 1, further shortening the bone ingrowth time; the first fixing member 3 uses the fixing screw 31 to facilitate the fastening connection between the medullary cavity handle 21 and the retained bone 1, reducing the possibility of the medullary cavity handle 21 detaching from the retained bone 1; two fixing screws 31 are provided to ensure the connection strength between the medullary cavity handle 21 and the retained bone 1.

[0039] Reference Figure 1 A first force cap 42 is integrally formed at one end of the temporary pressure rod 41 away from the medullary cavity handle 21, and the first force cap 42 is coaxial with the temporary pressure rod 41; the temporary pressure rod 41 is provided with a second force cap 43 that slides along the axis of the temporary pressure rod 41 and a fitting block 44 integrally formed with the second force cap 43, the fitting block 44 is arranged on a side of the second force cap 43 close to the medullary cavity handle 21, the second force cap 43 is coaxial with the temporary pressure rod 41, and the fitting block 44 has a surface corresponding to the outer surface contour of the retained bone 1.

[0040] When it is necessary to drive the medullary handle 21 to move upward, the expander is first placed between the first force cap 42 and the second force cap 43, and then force is applied to the expander, thereby driving the medullary handle 21 to move upward, so that the end surface of the defective segment 22 close to the medullary handle 21 can apply pressure to the end surface of the retained bone 1, which greatly improves the convenience of operation; since the operation needs to be performed in the human body, the operating space is limited. The first force cap 42 and the second force cap 43 are provided to facilitate the expander to apply force to the first force cap 42 and the second force cap 43, thereby driving the temporary pressure rod 41 to move upward. On the one hand, it greatly improves the convenience of surgical operation, and on the other hand, it reduces the possibility of needing to expand the wound to use the temporary pressure rod 41 to achieve the upward movement of the medullary handle 21, thereby alleviating the patient's pain; the provided fitting block 44 reduces the damage caused to the retained bone 1 by the expander when applying force to the first force cap 42 and the second force cap 43.

[0041] Reference Figure 3 The defective segment 22 includes a first portion 221 disposed on a side close to the medullary cavity handle 21 and a second portion 222 disposed on a side of the first portion 221 away from the medullary cavity handle 21, the first portion 221 and the second portion 222 are integrally formed, and the outer diameter of the first portion 221 is greater than the outer diameter of the second portion 222; a guide assembly 5 is disposed on one side of the medullary cavity handle 21 and the defective segment 22, the guide assembly 5 includes a guide plate 51 disposed on one side of the medullary cavity handle 21 and the defective segment 22, a side of the guide plate 51 away from the medullary cavity handle 21 is provided with a plurality of first guide holes coaxial with the fixing hole, and in the embodiment of the present application, two first guide holes are provided; a positioning block 52 is integrally formed on one side of the guide plate 51 close to the defective segment 22, a plurality of positioning grooves 2211 are provided on the end surface of the first portion 221 close to the second portion 222, the cross-section of the positioning groove 2211 is the same as the cross-section of the positioning block 52, and in the embodiment of the present application, two positioning grooves 2211 are provided, and the two positioning grooves 2211 are symmetrically arranged along the axis of the first portion 221.

[0042] Since the length of the intramedullary handle 21 is determined, the position of the fixing hole opened on the intramedullary handle 21 is also determined. Since the length of the guide plate 51 is determined, the position of the first guide hole is also determined. Therefore, in order to ensure that the fixing screw 31 can be accurately screwed into the fixing hole, it is only necessary to place the positioning block 52 in the positioning groove 2211 to achieve the limitation of the guide plate 51, so that the fixing screw 31 can be accurately screwed into the fixing hole. Such a design greatly improves the convenience of surgical operation.

[0043] Reference Figure 3 and Figure 4A fixing cap 53 is provided below the positioning block 52, the fixing cap 53 is sleeved on the second part 222, and the fixing cap 53 and the guide plate 51 are integrally formed; a second fixing member 54 is provided at one end of the fixing cap 53 away from the first part 221, the second fixing member 54 includes a threaded rod 541 coaxial with the second part 222 and a limiting cap 542 provided on the side of the threaded rod 541 away from the first part 221, the outer diameter of the limiting cap 542 is greater than the outer diameter of the second part 222, the limiting cap 542 and the threaded rod 541 are integrally formed, and a threaded hole for the threaded rod 541 to be screwed in is provided on the end surface of the second part 222 away from the first part 221.

[0044] When it is necessary to make the fixing screw 31 accurately screwed into the fixing hole, firstly, the fixing cap 53 is sleeved on the second part 222, and the positioning block 52 is placed in the positioning groove 2211 at the same time, and then the threaded rod 541 is screwed into the second part 222 until the limiting cap 542 abuts against the end face of the second part 222 away from the first part 221, thereby realizing the limitation of the guide plate 51, thereby further ensuring that the fixing screw 31 can be accurately screwed into the fixing hole; the set fixing cap 53, threaded rod 541 and limiting cap 542 enable the guide plate 51 to be connected with the defective segment 22, reducing the workload of holding the guide plate 51 all the time to complete the screwing of the fixing screw 31 into the fixing hole, improving the convenience of surgical operation, shortening the operation time, and improving the surgical efficiency.

[0045] Reference Figure 2 and Figure 3 A guide tube 55 coaxial with the first guide hole is integrally formed on the side of the guide plate 51 away from the medullary cavity handle 21, and the guide tube 55 is provided with a second guide hole coaxial with the first guide hole; a sleeve core 56 coaxial with the guide tube 55 is threadedly connected to the side of the guide tube 55 away from the guide plate 51, and the sleeve core 56 is provided with a third guide hole coaxial with the second guide hole, and the inner diameter of the third guide hole is smaller than the inner diameter of the second guide hole; a through hole is provided along the axis of the fixing screw 31.

[0046] When it is necessary to connect the intramedullary handle 21 with the retained bone 1, first, a guide pin smaller than the inner diameter of the third guide hole is driven into the fixing hole through the core sleeve 56 and the guide tube 55, and then the core sleeve 56 is separated from the guide tube 55. Next, the fixing screw 31 is sleeved on the guide pin and screwed in toward the fixing hole, thereby connecting the intramedullary handle 21 with the retained bone 1. This design reduces the possibility of the fixing screw 31 being offset when it is screwed in toward the fixing hole, thereby ensuring that the fixing screw 31 can be accurately screwed into the fixing hole, thereby ensuring the progress of the operation.

[0047] Reference Figure 1 and Figure 2An auxiliary fixing plate 6 is provided on one side of the medullary cavity handle 21 and the defect segment 22. The auxiliary fixing plate 6 has an inner surface corresponding to the outer surface contour of the retained bone 1. The auxiliary fixing plate 6 is provided with a first auxiliary screw 7 that passes through the defect segment 22 and the auxiliary fixing plate 6 and a second auxiliary screw that passes through the medullary cavity handle 21 and the auxiliary fixing plate 6. In the embodiment of the present application, two first auxiliary screws 7 and two second auxiliary screws are provided. The auxiliary fixing plate 6 is provided with a plurality of auxiliary holes 61 for the first auxiliary screws 7 and the second auxiliary screws to be screwed in.

[0048] After the medullary cavity handle 21 and the retained bone 1 are connected, the auxiliary fixing plate 6 is attached to the outer surface of the retained bone 1, so that the auxiliary fixing plate 6 is fitted with the outer surface of the retained bone 1, and then the first auxiliary screw 7 is screwed into the defect segment 22, and the second auxiliary screw is screwed into the medullary cavity handle 21, so as to achieve the connection between the defect segment 22 and the retained bone 1, thereby ensuring the connection strength between the femoral prosthesis 2 and the retained bone 1; the multiple auxiliary holes 61 are opened to improve the selectivity and reduce the damage of the first auxiliary screw 7 and the second auxiliary screw to the retained bone 1, so that the first auxiliary screw 7 and the second auxiliary screw can better achieve the connection between the femoral prosthesis 2 and the retained bone 1.

[0049] Operation method when the femoral prosthesis 2 is connected to the retained bone 1:

[0050] S1: resection of the diseased bone;

[0051] S2: a plug hole for inserting the medullary cavity handle 21 is opened in the medullary cavity of the retained bone 1 above the resected portion, and the medullary cavity handle 21 is inserted into the plug hole until the end surface of the medullary cavity handle 21 close to the defective section 22 is in contact with the end surface of the retained bone 1;

[0052] S3: Screw the temporary pressure rod 41 into the medullary handle 21;

[0053] S4: placing the spreader between the first force-applying cap 42 and the second force-applying cap 43, and applying force to the spreader, thereby driving the medullary handle 21 to move upward;

[0054] S5: Sleeve the fixing cap 53 on the second portion 222 and place the positioning block 52 in the positioning groove 2211 at the same time;

[0055] S6: Screw the threaded rod 541 into the second portion 222 until the limiting cap 542 is in contact with the end surface of the second portion 222 away from the first portion 221;

[0056] S7: driving a guide needle having a diameter smaller than the inner diameter of the third guide hole through the sheath core 56 and the guide tube 55 into the fixing hole;

[0057] S8: Separating the core 56 from the guide tube 55;

[0058] S9: Sleeve the fixing screw 31 onto the guide pin and screw it in toward the fixing hole;

[0059] S10: The threaded rod 541 is rotated outward, and the guide plate 51 is separated from the femoral prosthesis 2;

[0060] S11: attaching the auxiliary fixation steel plate 6 to the outer surface of the retained bone 1, screwing the first auxiliary screw 7 into the defect segment 22, and screwing the second auxiliary screw into the medullary cavity handle 21, thereby finally achieving the connection between the femoral prosthesis 2 and the retained bone 1;

[0061] S12: The temporary pressurizing rod 41 is screwed out from the intramedullary handle 21 .

[0062] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed. However, as long as it is within the scope of the claims of the present application, it shall be protected by the patent law.

Claims

1. An extramedullary axial compression fixation femoral prosthesis, comprising a medullary stem (21) and a defective segment (22), characterized in that: A temporary pressure rod (41) is provided at one end of the medullary cavity handle (21) away from the defective section (22); a first fixing member (3) is provided on the medullary cavity handle (21) for locking the medullary cavity handle (21) after the medullary cavity handle (21) is pressurized; One end of the temporary pressure rod (41) close to the medullary cavity handle (21) is detachably connected to the medullary cavity handle (21); one end of the temporary pressure rod (41) away from the medullary cavity handle (21) is connected to a first force cap (42); a second force cap (43) sliding along the axis of the temporary pressure rod (41) is provided on the temporary pressure rod (41), and a fitting block (44) is integrally formed on one end of the second force cap (43) away from the first force cap (42); A guide plate (51) is provided on one side of the medullary cavity handle (21) and the defective section (22); a first guide hole for the first fixing member (3) to extend into the retained bone (1) is provided on the side of the guide plate (51) away from the medullary cavity handle (21); a positioning block (52) is integrally formed on the side of the guide plate (51) close to the defective section (22); and a positioning groove (2211) for placing the positioning block (52) is provided on the defective section (22); A guide tube (55) is integrally formed on the side of the guide plate (51) away from the medullary cavity handle (21), and a second guide hole coaxial with the first guide hole is formed in the guide tube (55); A sleeve core (56) is threadedly connected to one side of the guide tube (55) away from the guide plate (51), and the sleeve core (56) is provided with a third guide hole coaxial with the second guide hole, and the inner diameter of the third guide hole is smaller than the inner diameter of the second guide hole; and a through hole is provided along the axis of the fixing screw (31).

2. The extramedullary axial compression fixation femoral prosthesis according to claim 1, characterized in that: The defective section (22) comprises a first part (221) arranged close to the medullary cavity handle (21) and a second part (222) arranged on a side of the first part (221) away from the medullary cavity handle (21), wherein the outer diameter of the first part (221) is greater than the outer diameter of the second part (222); the second part (222) is sleeved with a fixing cap (53), and the fixing cap (53) and the guide plate (51) are integrally formed; a second fixing member (54) is arranged at one end of the fixing cap (53) away from the first part (221); the second fixing member (54) comprises a threaded rod (541) and a limiting cap (542) arranged on a side of the threaded rod (541) away from the first part (221); and a threaded hole for screwing the threaded rod (541) into is provided on the end surface of the second part (222) away from the first part (221).

3. The extramedullary axial compression fixation femoral prosthesis according to claim 1, characterized in that: An auxiliary fixing steel plate (6) is provided on one side of the medullary cavity handle (21) and the defective segment (22); the auxiliary fixing steel plate (6) has a surface corresponding to the outer contour of the retained bone (1); the auxiliary fixing steel plate (6) is provided with a first auxiliary screw (7) penetrating the auxiliary fixing steel plate (6) and the defective segment (22) and a second auxiliary screw penetrating the auxiliary fixing steel plate (6) and the medullary cavity handle (21).

4. The extramedullary axial compression fixation femoral prosthesis according to claim 3, characterized in that: The auxiliary fixing steel plate (6) is provided with a plurality of auxiliary holes (61) for the first auxiliary screws (7) and the second auxiliary screws to be screwed into.

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