A radial stem mounting device

Abstract

This utility model provides a radial stem installation device, belonging to the field of medical device technology. The radial stem installation device includes a radial head prosthesis assembly and an installation assembly. The radial head prosthesis assembly includes a radial head and a radial stem, with the radial head positioned at the first end of the radial stem. A mounting groove is provided on the side wall of the first end of the radial stem. The installation assembly includes a clamping plate, a connecting plate, and a positioning element. A clamping head is provided at the lower end of the clamping plate, matching the mounting groove. The connecting plate is positioned at the upper end of the clamping plate and is arranged along the length of the radius. The positioning element is slidably mounted on the connecting plate, with its lower end abutting against the Lister's tubercle. In this radial stem installation device, the positioning element is positioned on the patient's Lister's tubercle. The positioning element, in conjunction with the connecting plate, guides the movement direction of the radial head prosthesis, improving the accuracy of radial head prosthesis implantation.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a radial stem mounting device. Background Technology

[0002] The elbow joint is one of the most complex joints in the human body, comprising the distal humerus, proximal ulna, and radial head. The humeroradial, humeroulnar, and radioulnar joints work together to complete elbow joint movements. Radial head fractures are common elbow fractures, accounting for approximately 5.4% of all fractures in the human body. Radial head replacement surgery is often used to treat patients with comminuted radial head fractures where structural reconstruction of the elbow joint stability is not possible. During the surgery, a lateral incision is made to expose the radial head. A micro-oscillating saw is used to perform a radial head osteotomy at the radial neck. The medullary canal of the proximal radius is reamed to achieve an anatomical match for the prosthesis. A trial prosthesis is inserted, and after confirming the size of the radial head prosthesis, an appropriately sized prosthesis is selected for installation. Due to the complex movements of the forearm and elbow joints, problems such as low prosthesis fit and poor installation accuracy are prone to occur, which may lead to complications such as prosthesis loosening, pain, and osteoporosis of the humeral head, seriously hindering the patient's recovery. Utility Model Content

[0003] The purpose of this invention is to provide a radial stem installation device, which aims to solve the problem of low accuracy in the installation position of the radial head prosthesis, which easily leads to complications and affects the patient's recovery.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a radial stem mounting device, comprising:

[0005] A radial head prosthesis assembly, comprising a radial head and a radial stem, the radial head being disposed at a first end of the radial stem, and a mounting groove being provided on the sidewall of the first end of the radial stem; and

[0006] The mounting assembly includes a mounting plate, a connecting plate, and a positioning element. The lower end of the mounting plate is provided with a mounting head that matches the mounting slot. The connecting plate is located at the upper end of the mounting plate and is positioned along the length of the radius. The positioning element is slidably mounted on the connecting plate, and the lower end of the positioning element abuts against the Lister's tubercle.

[0007] In one possible implementation, two sets of mounting slots are provided, with the two sets of mounting slots arranged in the same vertical plane and correspondingly located on the upper and lower sides of the radius stem.

[0008] In one possible implementation, the mounting head is provided with a mounting groove, the radial stem is disposed in the mounting groove, and the sidewall of the mounting groove abuts against the bottom of the mounting groove.

[0009] In one possible implementation, the connecting plate is provided with a slide groove, the slide groove is provided along the length direction of the connecting plate, and the positioning member is slidably disposed in the slide groove.

[0010] In one possible implementation, the positioning element includes a positioning rod, a sliding seat, and a locking nut. The sliding seat includes a sliding cylinder and a limiting plate. The sliding cylinder passes through the slide groove. The limiting plate is disposed at the lower end of the sliding cylinder and located below the connecting plate. The locking nut is sleeved on the sliding cylinder and located above the connecting plate. The locking nut is threadedly matched with the sliding cylinder. The positioning rod passes through the sliding cylinder from top to bottom. The lower end of the positioning rod abuts against the Lister node. The locking nut locks the sliding cylinder on the connecting plate.

[0011] In one possible implementation, the positioning rod has the freedom to move up and down within the sliding cylinder, and a locking cylinder for locking the positioning rod is provided on the outside of the sliding cylinder.

[0012] In one possible implementation, the upper end of the sliding cylinder is provided with a locking claw, the lower end of the locking cylinder is threadedly matched with the sliding cylinder, and the upper end of the locking cylinder presses the locking claw tightly against the positioning rod.

[0013] In one possible implementation, the outer diameter of the locking claw gradually increases from top to bottom, and the inner diameter of the upper end of the locking cylinder gradually increases from top to bottom.

[0014] In one possible implementation, a positioning marker is provided on the radial stem, the positioning marker being located on the side of the mounting slot away from the radial head.

[0015] In one possible implementation, a first positioning line is provided on the side wall of the first end of the radial stem, and a second positioning line is provided on the side wall of the radial head near the radial stem, the second positioning line being provided in correspondence with the first positioning line.

[0016] The beneficial effects of the radial stem mounting device provided by this utility model are as follows:

[0017] Compared with existing technologies, this invention includes a radial head prosthesis assembly and an installation assembly. The radial head prosthesis assembly comprises a radial head and a radial stem, with the radial head positioned at the end of the radial stem. A mounting slot is located on the side wall of the radial stem near the radial head. The installation assembly includes a mounting plate, a connecting plate, and a positioning element. The mounting plate is engaged in the mounting slot of the radial stem via a mounting head at its lower end. The connecting plate is positioned above the mounting plate and extends along the length of the radial stem. The positioning element is slidably connected to the connecting plate. During implantation, the mounting plate is engaged in the mounting slot of the radial stem, and the lower end of the positioning element rests against the Lister's tubercle. The positioning element remains stable during implantation. During implantation, the mounting plate and connecting plate move synchronously with the radial stem. The positioning element limits the movement of the mounting plate, preventing displacement and improving the accuracy of radial head prosthesis implantation. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the radial stem mounting device in use according to an embodiment of this utility model;

[0020] Figure 2 A schematic diagram of the radial stem mounting device provided in an embodiment of this utility model;

[0021] Figure 3 Schematic diagram of the radial head prosthesis assembly used in this embodiment of the utility model Figure 1 ;

[0022] Figure 4 Schematic diagram of the radial head prosthesis assembly used in this embodiment of the utility model Figure 2 ;

[0023] Figure 5 This is an exploded disassembly diagram of the radial head prosthesis assembly used in this embodiment of the utility model.

[0024] Figure 6 This is a schematic diagram of the exploded disassembly structure of the locking cylinder used in the embodiment of this utility model;

[0025] Figure 7 This is a schematic diagram of the vertical cross-sectional structure of the locking cylinder used in the embodiment of this utility model.

[0026] In the diagram: 1. Radial head; 2. Radial stem; 3. Mounting slot; 4. Positioning block; 5. First positioning line; 6. Second positioning line; 7. Mounting plate; 8. Mounting head; 9. Mounting groove; 10. Connecting plate; 11. Slide groove; 12. Positioning rod; 13. Locking nut; 14. Sliding cylinder; 15. Limiting plate; 16. Locking claw; 17. Locking cylinder; 18. Radius. Detailed Implementation

[0027] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0028] Please refer to Figures 1 to 7 The present invention provides a specific embodiment of a radial stem 2 and an installation device, including a radial head 1 prosthesis assembly and an installation assembly. The radial head 1 prosthesis assembly includes a radial head 1 and a radial stem 2. The radial head 1 is disposed at the first end of the radial stem 2, and an installation groove 3 is provided on the side wall of the first end of the radial stem 2. The installation assembly includes a clamping plate 7, a connecting plate 10, and a positioning member. A clamping head 8 is provided at the lower end of the clamping plate 7, and the clamping head 8 matches the installation groove 3. The connecting plate 10 is disposed at the upper end of the clamping plate 7 and is disposed along the length direction of the radius 18. The positioning member is slidably disposed on the connecting plate 10, and the lower end of the positioning member abuts against the Lister tubercle.

[0029] This utility model provides a radial stem 2 and an installation device. Compared with the prior art, it includes a radial head 1 prosthesis assembly and an installation assembly. The radial head 1 prosthesis assembly includes a radial head 1 and a radial stem 2. The radial head 1 is located at the end of the radial stem 2. An installation groove 3 is provided on the side wall of the radial stem 2 near the radial head 1. The installation assembly includes a clamping plate 7, a connecting plate 10, and a positioning element. The clamping plate 7 is clamped into the installation groove 3 of the radial stem 2 by a clamping head 8 located at the lower end. The connecting plate 10 is located on the clamping plate 7. At the upper end, the connecting plate 10 is set along the length direction of the radial stem 2. The positioning member is slidably connected to the connecting plate 10. During the implantation of the radial head 1 prosthesis assembly, the clamping plate 7 is clamped in the mounting slot 3 of the radial stem 2. The lower end of the positioning member abuts against the Lister tubercle. During the implantation process, the positioning member is kept stable. During the implantation process, the clamping plate 7 and the connecting plate 10 move synchronously with the radial stem 2. The positioning member limits the movement of the clamping plate 7 to avoid displacement and improve the accuracy of the radial head 1 prosthesis implantation.

[0030] For details, please refer to Figures 1 to 7The prosthesis includes a radial head 1 prosthesis assembly and an installation assembly. The radial head 1 prosthesis assembly includes a radial head 1 and a radial stem 2. The first end of the radial stem 2 is provided with an installation head, and the end of the radial head 1 is provided with an installation groove. The installation head is placed in the installation groove, and the installation head and the installation groove are fitted with a Mohs cone. The length of the radial stem 2 is extended, making it suitable for radial head 1 replacement in radial neck splits and long proximal radial fractures. The radial stem 2 is designed based on radial anatomical data, and its relevant dimensions conform to the patient's radial anatomical data, improving the fit between the radial stem 2 and the patient and facilitating prosthesis assembly. The installation of the component improves the stability of the radial stem 2 installation. The installation slot 3 is set on the side wall of the first end of the radial stem 2 near the radial head 1. The installation component includes a clamping plate 7, a connecting plate 10 and a positioning component. The clamping plate 7 is set vertically and has a clamping head 8 at the lower end. The clamping head 8 is clamped in the installation slot 3. The connecting plate 10 is set horizontally and is set at the upper end of the clamping plate 7. The connecting plate 10 is set along the length direction of the radius 18. The positioning component is set vertically and has a degree of freedom to slide between the positioning component and the connecting plate 10. The lower end of the positioning component is used to abut against the Lister tubercle.

[0031] As a specific embodiment of the radial stem 2 and mounting device provided by this utility model, please refer to Figures 1 to 5 There are two sets of mounting slots 3, which are located in the same vertical plane and are located on the upper and lower sides of the radius stem 2 respectively.

[0032] For details, please refer to Figures 1 to 5 The mounting slot 3 is an inclined slot, and the bottom of the mounting slot 3 has an angle with the horizontal plane. The two sets of mounting slots 3 are set opposite each other and are respectively set on the upper and lower sides of the radius stem 2. The bottoms of the two sets of mounting slots are parallel to each other, which facilitates the mounting of the mounting head 8.

[0033] As a specific embodiment of the radial stem 2 and mounting device provided by this utility model, please refer to Figure 1 , Figure 2 The mounting head 8 is provided with a mounting groove 9, the radius stem 2 is located in the mounting groove 9, and the side wall of the mounting groove 9 abuts against the bottom of the mounting groove 3.

[0034] For details, please refer to Figure 1 , Figure 2 The mounting groove 9 is set on the mounting head 8. The mounting groove 9 penetrates the left and right side walls of the mounting head 8. The mounting groove 9 covers the outside of the radius stem 2. The mounting head 8 is located outside the mounting groove 3. The two side walls of the mounting groove 9 are located in the two sets of mounting grooves 3 respectively.

[0035] As a specific embodiment of the radial stem 2 and mounting device provided by this utility model, please refer to Figure 1 , Figure 2 , Figure 6 as well as Figure 7 The connecting plate 10 is provided with a sliding groove 11, which is set along the length of the connecting plate 10, and the positioning element is slidably set in the sliding groove 11.

[0036] For details, please refer to Figure 1 , Figure 2 , Figure 6 as well as Figure 7 The slide groove 11 is set on the connecting plate 10 and is set along the length direction of the connecting plate 10. The positioning element is set in the slide groove 11 and is slidably set relative to the slide groove 11.

[0037] As a specific embodiment of the radial stem 2 and mounting device provided by this utility model, please refer to Figure 1 , Figure 2 , Figure 6 as well as Figure 7 The positioning components include a positioning rod 12, a sliding seat, and a locking nut 13. The sliding seat includes a sliding cylinder 14 and a limiting plate 15. The sliding cylinder 14 passes through the sliding groove 11. The limiting plate 15 is located at the lower end of the sliding cylinder 14 and below the connecting plate 10. The locking nut 13 is sleeved on the sliding cylinder 14 and located above the connecting plate 10. The locking nut 13 and the sliding cylinder 14 are threadedly matched. The positioning rod 12 passes through the sliding cylinder 14 from top to bottom. The lower end of the positioning rod 12 abuts against the Lister node. The locking nut 13 locks the sliding cylinder 14 on the connecting plate 10.

[0038] For details, please refer to Figure 1 , Figure 2 , Figure 6 as well as Figure 7 The positioning components include a positioning rod 12, a sliding seat, and a locking nut 13. The sliding seat includes a sliding cylinder 14 and a limiting plate 15. The sliding cylinder 14 is vertically positioned and located within the sliding groove 11. The limiting plate 15 is located at the lower end of the sliding cylinder 14. The locking nut 13 is sleeved on the upper end of the sliding cylinder 14 and threadedly matched with the sliding cylinder 14. The locking nut 13 and the limiting plate 15 are located at the upper and lower ends of the connecting plate 10, respectively. Rotating the locking nut 13 causes it to move downward, thereby locking the connecting rod and the sliding seat. Rotating the locking nut 13 in the opposite direction causes it to move upward, thereby unlocking the connecting rod and the sliding seat. The positioning rod 12 vertically penetrates the upper and lower end faces of the sliding cylinder 14, and the lower end of the positioning rod 12 abuts against the Lister node.

[0039] As a specific embodiment of the radial stem 2 and mounting device provided by this utility model, please refer to Figure 1 , Figure 2 , Figure 6 as well as Figure 7The positioning rod 12 has the freedom to move up and down inside the sliding cylinder 14, and a locking cylinder 17 for locking the positioning rod 12 is provided on the outside of the sliding cylinder 14.

[0040] For details, please refer to Figure 1 , Figure 2 , Figure 6 as well as Figure 7 The positioning rod 12 is slidably disposed inside the sliding cylinder 14, and the locking cylinder 17 is sleeved on the outside of the sliding cylinder 14 and disposed above the locking nut 13. The locking cylinder 17 is used to lock the positioning rod 12.

[0041] As a specific embodiment of the radial stem 2 and mounting device provided by this utility model, please refer to Figure 1 , Figure 2 , Figure 6 as well as Figure 7 The upper end of the sliding cylinder 14 is provided with a locking claw 16, the lower end of the locking cylinder 17 is threadedly matched with the sliding cylinder 14, and the upper end of the locking cylinder 17 presses the locking claw 16 tightly onto the positioning rod 12.

[0042] For details, please refer to Figure 1 , Figure 2 , Figure 6 as well as Figure 7 The locking claw 16 is located at the upper end of the sliding cylinder 14, and multiple sets of locking claw 16 are arranged around it. The lower end of the locking cylinder 17 is threadedly matched with the upper end of the sliding cylinder 14. When the locking cylinder 17 is rotated, it moves downward and presses the locking claw 16 tightly onto the positioning rod 12, thereby locking the positioning rod 12. When the locking cylinder 17 is rotated in the opposite direction, it moves upward and releases the pressure of the locking claw 16 on the positioning rod 12, thereby unlocking the positioning rod 12.

[0043] As a specific embodiment of the radial stem 2 and mounting device provided by this utility model, please refer to Figure 1 , Figure 2 , Figure 6 as well as Figure 7 The outer diameter of the locking claw 16 gradually increases from top to bottom, and the inner diameter of the upper end of the locking cylinder 17 gradually increases from top to bottom.

[0044] For details, please refer to Figure 1 , Figure 2 , Figure 6 as well as Figure 7 In the height direction, the thickness of the sidewall of the locking claw 16 gradually decreases as it moves upward, and the inner diameter of the upper end of the locking cylinder 17 gradually decreases as it moves upward.

[0045] As a specific embodiment of the radial stem 2 and mounting device provided by this utility model, please refer to Figures 1 to 5A positioning block 4 is provided on the radial stem 2, and the positioning block 4 is located on the side of the mounting slot 3 away from the radial head 1.

[0046] For details, please refer to Figures 1 to 5 The positioning block 4 is set on the radial stem 2. There are multiple sets of positioning blocks 4, which are distributed along the length direction of the radial stem 2. The positioning block 4 can be set as a positioning ring surrounding the radial stem 2. The positioning block 4 is used to mark the length of the radial stem 2 implanted.

[0047] As a specific embodiment of the radial stem 2 and mounting device provided by this utility model, please refer to Figures 1 to 5 A first positioning line 5 is provided on the side wall of the first end of the radial stem 2, and a second positioning line 6 is provided on the side wall of the radial head 1 near the radial stem 2. The second positioning line 6 is provided in correspondence with the first positioning line 5.

[0048] For details, please refer to Figures 1 to 5 The first positioning line 5 is set on the side wall of the first end of the radial stem 2, along the length of the radial stem 2. The second positioning line 6 is set on the side wall of the radial head 1 near the radial stem 2. When the radial stem 2 and the radial head 1 are installed, the first positioning line 5 and the second positioning line 6 are located in the same plane, which facilitates the determination of the position between the radial stem 2 and the radial head 1. After the radial head 1 and the radial stem 2 are installed, they are implanted into the patient's body.

[0049] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A radial stem mounting device, characterized in that include: A radial head prosthesis assembly, comprising a radial head and a radial stem, the radial head being disposed at a first end of the radial stem, and a mounting groove being provided on the sidewall of the first end of the radial stem; and The mounting assembly includes a mounting plate, a connecting plate, and a positioning element. The lower end of the mounting plate is provided with a mounting head that matches the mounting slot. The connecting plate is located at the upper end of the mounting plate and is positioned along the length of the radius. The positioning element is slidably mounted on the connecting plate, and the lower end of the positioning element abuts against the Lister's tubercle.

2. A radial stem mounting device as claimed in claim 1, characterized in that The mounting slots are provided in two sets, which are located in the same vertical plane and are correspondingly located on the upper and lower sides of the radius stem.

3. A radial stem mounting device as in claim 1, wherein, The mounting head is provided with a mounting groove, the radius stem is disposed in the mounting groove, and the side wall of the mounting groove abuts against the bottom of the mounting groove.

4. A radial stem mounting device as in claim 1, wherein, The connecting plate is provided with a sliding groove, which is arranged along the length of the connecting plate, and the positioning member is slidably disposed in the sliding groove.

5. A radial stem mounting device as claimed in claim 4, characterized in that The positioning component includes a positioning rod, a sliding seat, and a locking nut. The sliding seat includes a sliding cylinder and a limiting plate. The sliding cylinder passes through the sliding groove. The limiting plate is located at the lower end of the sliding cylinder and below the connecting plate. The locking nut is sleeved on the sliding cylinder and located above the connecting plate. The locking nut is threadedly matched with the sliding cylinder. The positioning rod passes through the sliding cylinder from top to bottom. The lower end of the positioning rod abuts against the Lister node. The locking nut locks the sliding cylinder on the connecting plate.

6. A radial stem mounting device as claimed in claim 5, characterized in that The positioning rod has the freedom to move up and down within the sliding cylinder, and a locking cylinder for locking the positioning rod is provided on the outside of the sliding cylinder.

7. The radial stem mounting device as described in claim 6, characterized in that, The upper end of the sliding cylinder is provided with a locking claw, the lower end of the locking cylinder is threaded to the sliding cylinder, and the upper end of the locking cylinder presses the locking claw tightly onto the positioning rod.

8. A radial stem mounting device as claimed in claim 7, characterized in that The outer diameter of the locking claw gradually increases from top to bottom, and the inner diameter of the upper end of the locking cylinder gradually increases from top to bottom.

9. A radial stem mounting device as in claim 1, wherein, A positioning marker is provided on the radial stem, and the positioning marker is located on the side of the mounting slot away from the radial head.

10. A radial stem mounting device as in claim 1, wherein, A first positioning line is provided on the side wall of the first end of the radial stem, and a second positioning line is provided on the side wall of the radial head near the radial stem, the second positioning line being provided in correspondence with the first positioning line.

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