Hip replacement assistive device

Abstract

The present invention belongs to the technical field of hip replacement, and specifically relates to a hip replacement auxiliary device, including a threaded connection section and a main rod section, the threaded connection section and the main rod section are detachably connected, the threaded connection section is a hollow structure inside and a strip groove is opened at the lower end, the threaded connection section is built with two symmetrically arranged oblique guide plates, the upper end spacing dimension between the two oblique guide plates is larger than the lower end spacing dimension, the tops of the two oblique guide plates are elastically connected by a first spring, the bottoms of the two oblique guide plates are respectively integrally formed with external thread blocks for threaded connection with acetabular outer cups, and a longitudinally extending push rod is arranged inside the threaded connection section; the present invention does not need to withdraw the threaded hole of the acetabular outer cup by rotation, so as to avoid changes in the implantation position of the acetabular outer cup in the acetabular socket.

Description

Technical Field

[0001] The invention belongs to the technical field of hip replacement, and in particular relates to a hip replacement auxiliary device. Background Art

[0002] Hip replacement surgery is a relatively mature and reliable treatment method in which an artificial prosthesis, including the femoral part and the acetabulum part, is fixed to normal bone using bone cement and screws to replace the diseased joint and reconstruct the normal function of the patient's hip joint. During the operation, the patient is required to lie on his side with the side of the hip joint that needs to be replaced facing up. After surgical dissection, the necrotic hip joint is exposed, and then the acetabular rasp is used to grind the necrotic tissue cartilage in the acetabulum. The acetabular outer cup is installed in the acetabular socket, fixed with bone screws, and the acetabular inner cup is installed. Finally, the prosthesis is installed on the femur and connected to the acetabular inner cup to complete the replacement surgery.

[0003] During the installation process of the acetabular outer cup, an installer is needed to install the acetabular outer cup in the acetabular socket. The existing installer is a rod-shaped structure with a striking head at one end and a threaded head at the other end. When in use, the threaded hole of the acetabular outer cup is connected to the threaded head of the installer, and after selecting the installation and implantation angle, the acetabular outer cup is implanted into the acetabular socket by hammering the striking head. After implantation, the installer is rotated to unscrew the threaded head. However, when the installer is rotated, the acetabular outer cup that has been implanted in the acetabular socket is easily caused to loosen with the rotation, resulting in a change in the implantation position. In order to avoid this problem, we propose a hip replacement auxiliary device. Summary of the invention

[0004] The purpose of the present invention is to provide a hip replacement auxiliary device to solve the problems existing in the background technology.

[0005] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows:

[0006] A hip joint replacement auxiliary device comprises a threaded connection section and a main rod section, wherein the threaded connection section and the main rod section are detachably connected;

[0007] The threaded connection section is hollow inside and has a strip groove at the lower end. Two symmetrically arranged oblique guide plates are built into the threaded connection section. The upper end spacing dimension between the two oblique guide plates is larger than the lower end spacing dimension. The tops of the two oblique guide plates are elastically connected by a first spring. The bottoms of the two oblique guide plates are respectively integrally formed with external thread blocks for threaded connection with the acetabulum outer cup. A longitudinally extending push rod is arranged inside the threaded connection section.

[0008] When the push rod is pushed downward, the push rod pushes and guides the two oblique guide plates and overcomes the elastic force of the first spring, so that the two oblique guide plates are relatively separated, and at this time, the two external thread blocks can be threadedly connected with the acetabular outer cup;

[0009] When the push rod is pushed upward, the push rod no longer pushes the two oblique guide plates, and the two oblique guide plates are relatively close to each other under the rebound effect of the first spring. At this time, the two external thread blocks can be disengaged from the threaded holes of the acetabulum outer cup and disconnected.

[0010] The push rod slides upward and passes through the threaded connection section. The middle and bottom parts of the push rod are both spacing sections. The part between the middle and bottom parts and above the middle part of the push rod are processed into I-beams. A first positioning groove corresponding to the shape of the lower side of the push rod is opened on the top of the threaded connection section.

[0011] The top of the main rod section is provided with a striking head and arc-shaped clamping blocks are processed on both sides of the lower end. The lower side of the main rod section is slidably connected with a sliding seat, and arc-shaped positioning grooves matching the arc-shaped clamping blocks are opened on both sides of the sliding seat;

[0012] A second spring fixedly connected to the main rod section is arranged between the two arc-shaped clamping blocks, a shell sleeve slidably connected to the outer wall of the main rod section is processed at the lower end of the second spring, the bottom of the shell sleeve abuts against the sliding seat, and the sliding seat is also symmetrically provided with a limit slide block, and the two arc-shaped clamping blocks are respectively provided with a limit slide groove matching the limit slide block;

[0013] A first disassembly and assembly component is arranged between the sliding seat and the upper side of the push rod, and a second disassembly and assembly component is arranged between the top of the threaded connection section and the two arc-shaped clamping blocks.

[0014] Both ends of one side of the upper I-beam are processed into a first wedge-shaped surface, and the upper I-beam is also provided with a card interface located below the wedge-shaped surface, and the bottom of the sliding seat is provided with a sliding hole matching the upper I-beam and the middle spacing section;

[0015] The first disassembly assembly comprises an assembly cavity opened in the sliding seat, the assembly cavity is communicated with the sliding hole, a slide plate is slidably connected in the assembly cavity, the slide plate is symmetrically provided with a clamping piece, and the end of the clamping piece is processed into a second wedge surface corresponding to the first wedge surface;

[0016] A rebound component matching the slide plate is also arranged inside the sliding seat.

[0017] The rebound component includes a push block and a spring sheet, the push block is slidably connected to the inside of the assembly cavity and fixedly connected to the slide plate, the spring sheet is arched, both ends of the spring sheet are fixedly connected to the inside of the assembly cavity and the arched side of the spring sheet abuts against the push block.

[0018] The end of the slide plate slides out of the assembly cavity and an operating strip is fixedly mounted on the end.

[0019] The two arc-shaped clamping blocks are both provided with a card interface, and the second disassembly and assembly component includes two elastic card blocks, the two elastic card blocks are both fixedly connected to the top of the threaded connection section, and the two elastic card blocks correspond to the two card interfaces respectively.

[0020] The bottoms of the two arc-shaped clamping blocks are both provided with positioning holes, and the shapes of the two positioning holes are different. The top of the threaded connection section is processed with positioning columns corresponding to the two positioning holes respectively.

[0021] During use, the threaded connection section is connected to the main rod section as a whole, and the two external thread blocks of the threaded connection section are connected to the threaded holes of the acetabular outer cup. Then, the angle is adjusted and the hammer is struck to install the acetabular outer cup into the acetabular socket to complete the implantation of the acetabular outer cup. Finally, the sliding seat is slid upward so that the push rod connected to the sliding seat no longer pushes the two oblique guide plates. Through the rebound of the first spring, the two external thread blocks can be disengaged from the threaded holes of the acetabular outer cup and can be directly taken out without the need to withdraw from the threaded holes of the acetabular outer cup by rotation, thereby avoiding changes in the implantation position of the acetabular outer cup in the acetabular socket. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further illustrated by means of the non-limiting examples given in the accompanying drawings.

[0023] Figure 1 The structure of the present invention is schematically shown Figure 1 ;

[0024] Figure 2 for Figure 1 A schematic diagram of the structure at A;

[0025] Figure 3 It is a schematic diagram and an exploded diagram of the internal structure of the threaded connection section of the present invention;

[0026] Figure 4 It is a schematic diagram of the local cross-sectional structure of the present invention. Figure 1 ;

[0027] Figure 5 for Figure 4 A schematic diagram of the structure at B;

[0028] Figure 6It is a schematic diagram of the local cross-sectional structure of the present invention. Figure 2 ;

[0029] Figure 7 for Figure 6 A schematic diagram of the structure at position C of FIG.

[0030] The main component symbols are described as follows:

[0031] Threaded connection section 100, oblique guide plate 101, first spring 102, external thread block 103, push rod 104, spacing section 1041, I-bar 1042, card interface 1043;

[0032] Main rod section 110, striking head 111, arc-shaped clamping block 112, sliding seat 113, second spring 114, shell 115, limiting sliding block 116, limiting sliding groove 117;

[0033] Slide plate 121, engaging piece 122, push block 123, spring piece 124, operating strip plate 125;

[0034] The card interface 130 , the elastic card block 131 , and the positioning column 132 . DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0036] Embodiment 1, as Figures 1 to 7 The hip replacement auxiliary device shown includes a threaded connection section 100 and a main rod section 110, and the threaded connection section 100 and the main rod section 110 are detachably connected;

[0037] The threaded connection section 100 is hollow inside and has a strip groove at the lower end. Two symmetrically arranged oblique guide plates 101 are built in the threaded connection section 100. The upper end spacing dimension between the two oblique guide plates 101 is greater than the lower end spacing dimension. The tops of the two oblique guide plates 101 are elastically connected by a first spring 102. The bottoms of the two oblique guide plates 101 are respectively integrally formed with external thread blocks 103 for threaded connection with the acetabular outer cup. A longitudinally extending push rod 104 is arranged inside the threaded connection section 100.

[0038] A striking head 111 is arranged on the top of the main rod section 110 and arc-shaped clamping blocks 112 are processed on both sides of the lower end. A sliding seat 113 is slidably connected to the lower side of the main rod section 110. Arc-shaped positioning grooves matching the arc-shaped clamping blocks 112 are opened on both sides of the sliding seat 113.

[0039] A second spring 114 fixedly connected to the main rod section 110 is arranged between the two arc-shaped clamping blocks 112. A shell 115 slidably connected to the outer wall of the main rod section 110 is processed at the lower end of the second spring 114. The bottom of the shell 115 abuts against the sliding seat 113. The sliding seat 113 is also symmetrically provided with a limit slider 116. The two arc-shaped clamping blocks 112 are respectively provided with a limit slide groove 117 matching the limit slider 116.

[0040] A first disassembly assembly is disposed between the sliding seat 113 and the upper side of the push rod 104 , and a second disassembly assembly is disposed between the top of the threaded connection section 100 and the two arc-shaped clamping blocks 112 .

[0041] The sliding seat 113 is provided with the limiting slide block 116 and the limiting slide groove 117 of the arc-shaped clamping block 112, so that the sliding seat 113 can remain stable when sliding relative to the arc-shaped clamping block 112, and can be limited at the same time to prevent the sliding seat 113 from falling off from the lower end of the arc-shaped clamping block 112, and the second spring 114 is provided so that the second spring 114 can push the shell 115 without applying external force, so that the shell 115 keeps the sliding seat 113 at the lower end of the two arc-shaped clamping blocks 112;

[0042] The threaded connection section 100 has a hollow structure and a strip groove at the lower end, so that the two oblique guide plates 101 can move along the strip groove at the lower end in the space inside the threaded connection section 100. The push rod 104 is used as a driving member to drive the movement of the two oblique guide plates 101 by pushing and pulling the push rod 104, as follows:

[0043] ① When the push rod 104 is pushed downward, the push rod 104 pushes and guides the two oblique guide plates 101 and overcomes the elastic force of the first spring 102, so that the two oblique guide plates 101 are relatively separated, and at this time, the two external thread blocks 103 can be threadedly connected with the acetabular outer cup;

[0044] ② When the push rod 104 is pushed upward, the push rod 104 no longer pushes the two oblique guide plates 101. Under the rebound effect of the first spring 102, the two oblique guide plates 101 are relatively close to each other. At this time, the two external thread blocks 103 can be disengaged from the threaded holes of the acetabular outer cup and disconnected.

[0045] Finally, the threaded connection section 100 and the main rod section 110 are detachable so that the threaded connection section 100 can be replaced. Specifically, two threaded connection sections 100 can be prepared, wherein the bottoms of the two oblique guide plates 101 in one threaded connection section 100 are processed into external thread blocks corresponding to the M10 specification, and the bottoms of the two oblique guide plates 101 in the other threaded connection section 100 are processed into external thread blocks corresponding to the M6 ​​specification, so as to be suitable for the threaded holes opened in the acetabular cup prosthesis circulating on the market. When disassembling and assembling, the sliding seat 113 and the push rod 104 are connected together by the first disassembling and assembling component, and the threaded connection section 100 and the two arc-shaped clamping blocks 112 are connected together by the second disassembling and assembling component. In this way, the threaded connection section 100 can be connected to the main rod section 110, and the same applies when removing.

[0046] During use, the threaded connection section 100 is connected to the main rod section 110 as a whole, and the two external thread blocks 103 of the threaded connection section 100 are connected to the threaded holes of the acetabular outer cup. Then, the hammering head 111 is struck to insert the acetabular outer cup into the acetabular socket to complete the implantation of the acetabular outer cup. Finally, the sliding seat 113 is slid upward so that the push rod 104 connected to the sliding seat 113 no longer pushes the two oblique guide plates 101. Through the rebound of the first spring 102, the two external thread blocks 103 can be disengaged from the threaded holes of the acetabular outer cup and can be directly taken out without having to withdraw from the threaded holes of the acetabular outer cup by rotation, thereby avoiding changes in the implantation position of the acetabular outer cup in the acetabular socket.

[0047] It should be noted that the bottom end of the oblique guide plate 101 is vertically oriented, so that after the push rod 104 is fully pushed downward, the bottom end of the oblique guide plate 101 can be clamped on both sides of the push rod 104 instead of obliquely abutting, thereby avoiding the elastic force rebound of the first spring 102 and the oblique guide plate 101 from loosening due to its oblique downward direction.

[0048] In this embodiment, the push rod 104 is also designed in shape, such as Figure 3 As shown:

[0049] The push rod 104 slides upward through the threaded connection section 100. The middle and bottom of the push rod 104 are both spacing sections 1041. The middle and bottom of the push rod 104 and above the middle are processed into I-beams 1042. The top of the threaded connection section 100 is provided with a first positioning groove corresponding to the shape of the lower side of the push rod 104.

[0050] The push rod 104 can be limited in motion by the spacing segments 1041 in the middle and the bottom:

[0051] ① When the push rod 104 moves downward, the middle spacer section 1041 abuts against the top of the threaded connection section 100, and the bottom spacer section 1041 pushes the two oblique guide plates 101 to separate relatively;

[0052] ② When the push rod 104 moves upward and the spacing section 1041 at the bottom abuts against the top of the threaded connection section 100 , the two oblique guide plates 101 are relatively close to each other due to the elastic rebound of the first spring 102 .

[0053] Embodiment 2 is a further description of the first disassembly assembly and the second disassembly assembly in Embodiment 1. Figures 1 to 7 As shown:

[0054] Both ends of one side of the upper I-shaped rod 1042 are processed into a first wedge-shaped surface, and the upper I-shaped rod 1042 is also provided with a card interface 1043 located below the wedge-shaped surface, and the bottom of the sliding seat 113 is provided with a sliding hole matching the upper I-shaped rod 1042 and the middle spacing section 1041;

[0055] The first disassembly assembly includes an assembly cavity opened in the sliding seat 113, the assembly cavity is connected to the sliding hole, a slide plate 121 is slidably connected in the assembly cavity, the slide plate 121 is symmetrically provided with a clamping piece 122, and the end of the clamping piece 122 is processed into a second wedge surface corresponding to the first wedge surface;

[0056] A rebound component matching the slide plate 121 is also provided inside the sliding seat 113, and the rebound component includes a push block 123 and a spring piece 124. The push block 123 is slidably connected to the inside of the assembly cavity and fixedly connected to the slide plate 121. The spring piece 124 is arched, and both ends of the spring piece 124 are fixedly connected to the inside of the assembly cavity, and the arched side of the spring piece 124 abuts against the push block 123.

[0057] The two arc-shaped clamping blocks 112 are both provided with a card interface 130 . The second disassembly assembly includes two elastic card blocks 131 . The two elastic card blocks 131 are both fixedly connected to the top of the threaded connection section 100 , and the two elastic card blocks 131 correspond to the two card interfaces 130 respectively.

[0058] When not assembled, the spring piece 124 in the assembly cavity elastically arches to push the push block 123, so that the clamping piece 122 set on the slide plate 121 enters the sliding hole inside the sliding seat 113; when performing the first disassembly assembly to connect the push rod 104 with the sliding seat 113, the sliding seat 113 is pushed to the lower end of the two arc-shaped clamping blocks 112 by hand, and then the first wedge surface processed by the I-beam 1042 on the upper side of the push rod 104 is abutted against the second wedge surface of the clamping piece 122, so that when the push rod 104 is clamped upward, the first wedge surface and the second wedge surface guide The card piece 122 pushes the slide plate 121, so that the push block 123 of the slide plate 121 overcomes the elastic force of the spring piece 124, so that the I-shaped rod 1042 on the upper side of the push rod 104 can be completely inserted into the slide hole at the bottom of the sliding seat 113. As the card piece 122 corresponds to the card interface 1043 of the I-shaped rod 1042 on the upper side of the push rod 104, the spring piece 124 rebounds elastically, so that the push block 123 pushes the slide plate 121, and the card piece 122 is inserted into the card interface 1043, so that the push rod 104 is connected and fixed to the sliding seat 113. Figure 7 As shown;

[0059] At the same time, during the assembly process of the first disassembly assembly, the two elastic clamping blocks 131 at the top of the threaded connection section 100 can be inserted into the clamping interfaces 130 of the two arc-shaped clamping blocks 112, thereby completing the connection between the top of the threaded connection section 100 and the two arc-shaped clamping blocks 112. Figure 5 shown.

[0060] In this way, during assembly, the top of the threaded connection section 100 can be synchronously connected to the two arc-shaped clamping blocks 112 and the push rod 104 can be connected to the sliding seat 113. During disassembly, the sliding plate 121 is pulled to withdraw the clamping piece 122 from the clamping interface 1043, the push rod 104 is disconnected from the sliding seat 113, and the two elastic clamping blocks 131 are pressed from both sides to withdraw the two elastic clamping blocks 131 from the two clamping interfaces 130 at the same time, so that the threaded connection section 100 is disconnected from the two arc-shaped clamping blocks 112. Finally, the threaded connection section 100 can be pulled downwards to carry out disassembly and assembly between the threaded connection section 100 and the main rod section 110.

[0061] As further explanation in this embodiment, Figures 1 to 7 As shown, the end of the slide plate 121 slides out of the assembly cavity and an operating strip 125 is fixedly installed on the end. The bottoms of the two arc-shaped clamping blocks 112 are also provided with positioning holes, and the shapes of the two positioning holes are different. The top of the threaded connection section 100 is processed with positioning columns 132 corresponding to the two positioning holes respectively.

[0062] The operating strip 125 is provided to facilitate the sliding seat 113 to slide up and down and to pull the slide plate 121. Positioning holes of different shapes are opened at the bottom of the two arc-shaped clamping blocks 112, and corresponding positioning columns 132 are processed at the top of the threaded connection section 100, so that the assembly direction can be positioned during the assembly process to avoid reverse installation.

[0063] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A hip replacement auxiliary device, comprising a threaded connection section and a main rod section, characterized in that: The threaded connection section is detachably connected to the main rod section; The threaded connection section is hollow inside and has a strip groove at the lower end. Two symmetrically arranged oblique guide plates are built into the threaded connection section. The upper end spacing dimension between the two oblique guide plates is larger than the lower end spacing dimension. The tops of the two oblique guide plates are elastically connected by a first spring. The bottoms of the two oblique guide plates are respectively integrally formed with external thread blocks for threaded connection with the acetabulum outer cup. A longitudinally extending push rod is arranged inside the threaded connection section. When the push rod is pushed downward, the push rod pushes and guides the two oblique guide plates and overcomes the elastic force of the first spring, so that the two oblique guide plates are relatively separated, and at this time, the two external thread blocks can be threadedly connected with the acetabular outer cup; When the push rod is pushed upward, the push rod no longer pushes the two oblique guide plates, and under the rebound effect of the first spring, the two oblique guide plates are relatively close to each other, and at this time, the two external thread blocks can be disengaged from the threaded holes of the acetabular outer cup and disconnected; The push rod slides upward and passes through the threaded connection section. The middle and bottom parts of the push rod are both spacing sections. The part between the middle and bottom parts and above the middle part of the push rod are processed into I-beams. A first positioning groove corresponding to the shape of the lower side of the push rod is opened on the top of the threaded connection section.

2. A hip replacement auxiliary device according to claim 1, characterized in that: The top of the main rod section is provided with a striking head and arc-shaped clamping blocks are processed on both sides of the lower end. The lower side of the main rod section is slidably connected with a sliding seat, and arc-shaped positioning grooves matching the arc-shaped clamping blocks are opened on both sides of the sliding seat; A second spring fixedly connected to the main rod section is arranged between the two arc-shaped clamping blocks, a shell sleeve slidably connected to the outer wall of the main rod section is processed at the lower end of the second spring, the bottom of the shell sleeve abuts against the sliding seat, and the sliding seat is also symmetrically provided with a limit slide block, and the two arc-shaped clamping blocks are respectively provided with a limit slide groove matching the limit slide block; A first disassembly and assembly component is arranged between the sliding seat and the upper side of the push rod, and a second disassembly and assembly component is arranged between the top of the threaded connection section and the two arc-shaped clamping blocks.

3. A hip replacement auxiliary device according to claim 2, characterized in that: Both ends of one side of the upper I-beam are processed into a first wedge-shaped surface, and the upper I-beam is also provided with a card interface located below the wedge-shaped surface, and the bottom of the sliding seat is provided with a sliding hole matching the upper I-beam and the middle spacing section; The first disassembly assembly comprises an assembly cavity opened in the sliding seat, the assembly cavity is communicated with the sliding hole, a slide plate is slidably connected in the assembly cavity, the slide plate is symmetrically provided with a clamping piece, and the end of the clamping piece is processed into a second wedge surface corresponding to the first wedge surface; A rebound component matching the slide plate is also arranged inside the sliding seat.

4. A hip replacement auxiliary device according to claim 3, characterized in that: The rebound component includes a push block and a spring sheet, the push block is slidably connected to the inside of the assembly cavity and fixedly connected to the slide plate, the spring sheet is arched, both ends of the spring sheet are fixedly connected to the inside of the assembly cavity and the arched side of the spring sheet abuts against the push block.

5. A hip replacement auxiliary device according to claim 4, characterized in that: The end of the slide plate slides out of the assembly cavity and an operating strip is fixedly mounted on the end.

6. A hip replacement auxiliary device according to claim 5, characterized in that: The two arc-shaped clamping blocks are both provided with a card interface, and the second disassembly and assembly component includes two elastic card blocks, the two elastic card blocks are both fixedly connected to the top of the threaded connection section, and the two elastic card blocks correspond to the two card interfaces respectively.

7. A hip replacement auxiliary device according to claim 6, characterized in that: The bottoms of the two arc-shaped clamping blocks are both provided with positioning holes, and the shapes of the two positioning holes are different. The top of the threaded connection section is processed with positioning columns corresponding to the two positioning holes respectively.

Images