A modular shoulder joint prosthesis and implantation method thereof

Abstract

The present invention provides a modular shoulder joint prosthesis and an implantation method thereof, belonging to the technical field of medical prostheses. It comprises a humeral stem, a reverse shoulder humeral body is arranged at the top of the humeral stem, a glenoid liner is arranged at the top of the reverse shoulder humeral body, one end surface of the glenoid liner contacts with a glenosphere head, one end of the glenosphere head is arranged with a metal glenoid back plate, and one end of the metal glenoid back plate is arranged with a metal glenoid back plate fixing screw; a support assembly, a support assembly is arranged on the outer surface of the humeral stem, and the support assembly is used to assist in the installation and support of the humeral stem. The present invention improves the stability of the humeral stem after being inserted into the humeral medullary cavity by arranging a support assembly, improves the subsequent installation stability of the humeral stem and the reverse shoulder humeral body by arranging an auxiliary assembly, improves the subsequent installation stability of the humeral stem and the reverse shoulder humeral body by screws, and reduces the influence of the screw coming off on the installation efficiency of the humeral stem and the reverse shoulder humeral body.

Description

Technical Field

[0001] The invention relates to the technical field of medical prostheses, and in particular to a modular shoulder joint prosthesis and an implantation method thereof. Background Art

[0002] Due to disease or trauma, a patient may need to undergo a total shoulder replacement surgery. In a total shoulder replacement surgery, a humeral prosthesis is used to replace the natural head of the patient's humerus. The humeral prosthesis generally includes an elongated column component implanted into the medullary cavity of the patient's humerus and a hemispherical prosthetic head component fixed to the column component. In such a total shoulder replacement surgery, the natural glenoid surface of the scapula is resurfaced or otherwise replaced using a glenoid component that provides a bearing surface, wherein the prosthetic head component of the humeral prosthesis can perform joint motion on this bearing surface.

[0003] However, when implanting the existing modular shoulder prosthesis, it is necessary to fill the humeral medullary cavity with bone cement and insert the humeral stem. While waiting for the bone cement to harden, the humeral stem may be displaced due to the action of external forces. At the same time, when installing the humeral stem and the anti-scapulohumeral body, it is inconvenient to install them with screws due to the small size of the anti-scapulohumeral body. The screws may come loose, thereby affecting the installation efficiency of the entire shoulder prosthesis. Therefore, the present application provides a modular shoulder prosthesis and its implantation method to meet the needs. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a modular shoulder joint prosthesis and its implantation method to solve the problem that when the existing modular shoulder joint prosthesis is implanted, bone cement needs to be filled in the humeral medullary cavity and the humeral stem needs to be inserted. While waiting for the bone cement to harden, the humeral stem may be displaced due to the action of external force factors. At the same time, when installing the humeral stem and the anti-shoulder humeral body, due to the small volume of the anti-shoulder humeral body, it is inconvenient to install it with screws, which affects the installation efficiency of the overall installation of the shoulder joint prosthesis.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A modular shoulder joint prosthesis comprises a humeral stem, a reverse shoulder humeral body is arranged at the top of the humeral stem, a glenoid liner is fixedly installed at the top of the reverse shoulder humeral body, one end surface of the glenoid liner contacts with a glenosphere head, one end of the glenosphere head is arranged with a metal glenoid back plate, and one end of the metal glenoid back plate is arranged with a metal glenoid back plate fixing screw; a support assembly, a support assembly is arranged on the outer surface of the humeral stem, and the support assembly is used to assist in the installation and support of the humeral stem; an auxiliary assembly, an auxiliary assembly is arranged at the top of the humeral stem, and the auxiliary assembly is used to assist in the installation between the humeral stem and the reverse shoulder humeral body.

[0007] Optionally, the supporting assembly includes a flat gear, which is rotatably mounted on the top of the humeral stem, a rack is meshed on one side of the flat gear, and the rack is fixedly mounted on the bottom end of the anti-shoulder humeral body, one end of the flat gear is connected to a bevel gear set 1, a rotating rod is fixedly mounted on the bottom end of the bevel gear set 1, and the rotating rod is nested inside the humeral stem.

[0008] Optionally, a fixed sleeve on the outer surface of the rotating rod is provided with a gear plate, a bevel gear is meshed with the top of the gear plate, the bevel gear is arranged at the bottom end of the humeral stem, a screw is fixedly installed at one end of the bevel gear, and the screw is arranged at an equal angle at the bottom end of the humeral stem.

[0009] Optionally, a threaded base is sleeved on the outer surface of one end of the screw rod, a limiting ring is sleeved on the outer surface of the threaded base, the limiting ring is fixedly mounted on the inner wall of the humeral stem, a supporting pad is fixedly mounted on one end of the threaded base, and the supporting pads are arranged at equal angles at the opening of the humeral stem.

[0010] Optionally, the auxiliary component includes a second gear plate, which is sleeved on the upper part of the outer surface of the rotating rod, and is fixedly connected to the outer surface of the rotating rod. A second bevel gear is meshed with the top of the second gear plate, and one end of the second bevel gear is fixedly connected to a transmission rod, and the transmission rod is rotatably installed on the top of the humeral handle.

[0011] Optionally, one end of the transmission rod is fixedly connected to a bevel gear set 2, the bevel gear set 2 is rotatably mounted on the top of the humeral stem, one end of the bevel gear set 2 is connected to a crank, and one end of the crank is provided with a claw.

[0012] Optionally, a special-shaped rack is provided at the bottom end of the clamping claw, a push block 1 is provided at one end of the special-shaped rack, and the push block 1 is nested in the inner wall of the humeral handle.

[0013] Optionally, a push block 2 is provided at one end of the push block 1, the push block 2 is nested on the inner wall of the humeral handle, and a wedge is fixedly connected to the top of the push block 2.

[0014] Optionally, a mounting ring is fixedly mounted on the bottom end of the anti-scapulohumeral body, a telescopic rod is elastically mounted on the inner wall of the mounting ring, a clamping block is fixedly mounted on one end of the telescopic rod, and one end of the clamping block is in contact with the wedge block.

[0015] The present application also provides a method for implanting a modular shoulder joint prosthesis, the steps of which are as follows:

[0016] S1. The medical staff fills the patient's humeral medullary cavity with bone cement and inserts the humeral stem, and pushes the bottom end of the humeral body of the reverse shoulder to approach and contact the top end of the humeral stem;

[0017] S2, using the force of the humeral body contacting the humeral stem through the reverse shoulder to drive the support component to operate, support the inner wall of the patient's humeral medullary cavity, and complete the implantation of the humeral stem with the help of bone cement;

[0018] S3, while the support component is running, the auxiliary component is linked to assist the clamping between the humeral body and the humeral handle through the auxiliary component;

[0019] S4. After the bone cement has completely hardened, the medical staff will assemble the glenoid liner and the metal glenoid back plate in sequence. After the glenosphere head and the glenoid liner are in contact with each other, they will suture the wound at the patient's shoulder joint to complete the implantation of the shoulder prosthesis.

[0020] Compared with the prior art, the present invention has at least the following beneficial effects:

[0021] In the above scheme, by setting up a support component, the force of the reverse shoulder humeral body contacting the humeral stem is utilized to push out multiple groups of support pads arranged at equal angles, thereby achieving a support effect on the outer surface of the humeral stem, providing auxiliary support when the humeral stem is inserted, and at the same time cooperating with the subsequent filling effect of bone cement to improve the stability of the humeral stem after insertion into the humeral medullary cavity, prevent the humeral stem from being displaced by external force while waiting for the bone cement to harden, and further ensure the stability of the humeral stem after insertion into the humeral medullary cavity.

[0022] By setting up an auxiliary component and utilizing the linkage cooperation between push block one and push block two, the preliminary clamping of the reverse shoulder humerus body and the humeral stem can be achieved, and at the same time, the special configuration of the special-shaped rack can be utilized to avoid the detachment of the reverse shoulder humerus body and the humeral stem caused by secondary reduction due to external force after the reverse shoulder humerus body and the humeral stem are clamped, thereby affecting the connection effect between the reverse shoulder humerus body and the humeral stem. At the same time, by performing the preliminary clamping of the reverse shoulder humerus body and the humeral stem, the installation stability of the humeral stem and the reverse shoulder humerus body during subsequent installation by screws is improved, and the influence of the screw coming off on the installation efficiency of the humeral stem and the reverse shoulder humerus body is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, further serve to explain the principles of the invention and to enable those skilled in the relevant art to make and use the invention.

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of a modular shoulder joint prosthesis;

[0025] Figure 2 It is a schematic diagram of the cross-sectional structure of a modular shoulder joint prosthesis;

[0026] Figure 3 for Figure 2 A magnified view of middle;

[0027] Figure 4 It is a schematic diagram of some components of the support assembly;

[0028] Figure 5 It is a schematic diagram of a partial cross-sectional structure of a support component;

[0029] Figure 6 It is a schematic diagram of the cross-sectional structure of some components of the support component;

[0030] Figure 7 is a schematic diagram of the auxiliary component structure;

[0031] Figure 8 for Figure 7 Enlarged view of middle B;

[0032] Fig. 9 It is a schematic cross-sectional view of some components of the auxiliary components.

[0033] [Reference Signs]

[0034] 1. Humeral handle; 2. Anti-shoulder humeral body; 3. Glenoid liner; 4. Glenoid head; 5. Metal glenoid back plate; 6. Metal glenoid back plate fixing screw; 7. Support assembly; 71. Flat gear; 710. Rack; 72. Bevel gear set 1; 73. Rotating rod; 74. Gear plate 1; 75. Bevel gear 1; 76. Screw; 77. Threaded base; 78. Limiting ring; 79. Support pad; 8. Auxiliary assembly; 81. Gear plate 2; 82. Bevel gear 2; 83. Transmission rod; 84. Bevel gear set 2; 85. Curved wheel; 86. Clamping claw; 87. Special-shaped rack; 88. Push block 1; 89. Push block 2; 810. Wedge block; 811. Mounting ring; 812. Telescopic rod; 813. Clamping block.

[0035] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0036] The modular shoulder joint prosthesis and its implantation method provided by the present invention are described in detail below in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternatives to implement some known technologies; and the accompanying drawings are only for a more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0037] It should be noted that the references to "one embodiment", "embodiment", "exemplary embodiments", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0038] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0039] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” not only means “directly on” something, but also includes the meaning of being “on” something with intervening features or layers therebetween, and “on” or “over” not only means “on” or “above” something, but also includes the meaning of being “on” or “above” something with no intervening features or layers therebetween.

[0040] Additionally, spatially relative terms such as "under," "beneath," "lower," "above," "upper," and the like may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein may be similarly interpreted accordingly.

[0041] like Figures 1 to 3As shown, an embodiment of the present invention provides a modular shoulder joint prosthesis, including a humeral stem 1, a reverse shoulder humeral body 2 is arranged at the top of the humeral stem 1, a glenoid liner 3 is fixedly installed at the top of the reverse shoulder humeral body 2, one end surface of the glenoid liner 3 contacts with a glenosphere head 4, one end of the glenosphere head 4 is arranged with a metal glenoid back plate 5, and one end of the metal glenoid back plate 5 is arranged with a metal glenoid back plate fixing screw 6; a support component 7, a support component 7 is arranged on the outer surface of the humeral stem 1, and the support component 7 is used to assist in the installation and support of the humeral stem 1; an auxiliary component 8, an auxiliary component 8 is arranged at the top of the humeral stem 1, and the auxiliary component 8 is used to assist in the installation between the humeral stem 1 and the reverse shoulder humeral body 2.

[0042] By setting up the support component 7 and utilizing the force of the reverse shoulder humeral body 2 contacting the humeral stem 1, the support component 7 is driven to operate. When the humeral stem 1 is inserted into the humeral medullary cavity, the inner wall of the humeral medullary cavity is initially supported by the support component 7, and at the same time, the hardening effect of the bone cement is cooperated to improve the fixation effect of the humeral stem 1 in the humeral medullary cavity. At the same time, the linkage auxiliary component 8 is used to realize auxiliary installation between the humeral stem 1 and the reverse shoulder humeral body 2, so as to avoid the displacement of the humeral stem 1 and the reverse shoulder humeral body 2 due to external force factors during installation, thereby improving the connection stability between the humeral stem 1 and the reverse shoulder humeral body 2.

[0043] As an implementation method in this embodiment, Figures 4 to 6 As shown, the support assembly 7 includes a flat gear 71, which is rotatably mounted on the top of the humeral stem 1, a rack 710 is meshed on one side of the flat gear 71, and the rack 710 is fixedly mounted on the bottom end of the anti-shoulder humeral body 2, one end of the flat gear 71 is connected to a bevel gear set 72, and a rotating rod 73 is fixedly mounted on the bottom end of the bevel gear set 72, and the rotating rod 73 is nested inside the humeral stem 1, and a meshing plate 74 is fixedly sleeved on the outer surface of the rotating rod 73, and a meshing plate 74 is meshed on the top of the meshing plate 74. A bevel gear 75 is provided, and the bevel gear 75 is arranged at the bottom end of the humeral stem 1. A screw rod 76 is fixedly installed at one end of the bevel gear 75. The screw rod 76 is arranged at an equal angle at the bottom end of the humeral stem 1. A threaded base 77 is sleeved on the outer surface of one end of the screw rod 76. A limiting ring 78 is sleeved on the outer surface of the threaded base 77. The limiting ring 78 is fixedly installed on the inner wall of the humeral stem 1. A support pad 79 is fixedly installed at one end of the threaded base 77. The support pad 79 is arranged at an equal angle at the opening of the humeral stem 1.

[0044] In this embodiment, the medical staff first cuts open the skin at the patient's shoulder joint and separates the muscles at the shoulder joint to expose the bone structure at the patient's shoulder joint, and then removes the diseased humeral head;

[0045] The user fills bone cement in the humeral medullary cavity and inserts the humeral stem 1. Then the medical staff aligns the reverse shoulder humeral body 2 with the humeral stem 1 and pushes the bottom end of the reverse shoulder humeral body 2 to approach and contact the top end of the humeral stem 1. The reverse shoulder humeral body 2 drives the rack 710 at the bottom end to pass through and engage with the flat gear 71 to rotate. When the flat gear 71 rotates, it drives the input end of the bevel gear set 72 to rotate synchronously. When the input end of the bevel gear set 72 rotates, it engages with the output end of the bevel gear set 72 to rotate. When the output end of the bevel gear set 72 rotates, it drives the bottom end to rotate. As the rod 73 rotates, the rotating rod 73 drives the meshing plate 74 to rotate synchronously. As the meshing plate 74 rotates, the meshing bevel gear 75 rotates. The bevel gear 75 drives the screw 76 to rotate synchronously. Under the rotation of the screw 76, the threaded base 77 sleeved on the outer surface of the screw 76 slides against the inner wall of the limiting ring 78. When the threaded base 77 slides, it drives the support pad 79 to be ejected. Since there is a gap between the humeral handle 1 and the inner wall of the humeral medullary cavity, the inner wall of the humeral medullary cavity is pre-supported by multiple groups of support pads 79 arranged at equal angles.

[0046] By setting a rack 710 and a flat gear 71, the force of the reverse shoulder humeral body 2 contacting the humeral stem 1 is utilized to push out multiple groups of support pads 79 arranged at equal angles, thereby achieving a supporting effect on the outer surface of the humeral stem 1, providing auxiliary support when the humeral stem 1 is inserted, and improving the stability of the humeral stem 1 after being inserted into the humeral medullary cavity.

[0047] As an implementation method in this embodiment, Figures 7 to 9 As shown, the auxiliary component 8 includes a second meshing plate 81, which is sleeved on the upper outer surface of the rotating rod 73, and the second meshing plate 81 is fixedly connected to the outer surface of the rotating rod 73. The top of the second meshing plate 81 is meshed with a second bevel gear 82, and one end of the second bevel gear 82 is fixedly connected to a transmission rod 83, which is rotatably mounted on the top of the humeral handle 1, and one end of the transmission rod 83 is fixedly connected to a second bevel gear set 84, which is rotatably mounted on the top of the humeral handle 1, and one end of the second bevel gear set 84 is connected to a crank 85, and one end of the crank 85 is provided with a card Claw 86, a special-shaped rack 87 is provided at the bottom end of the claw 86, a push block 88 is provided at one end of the special-shaped rack 87, the push block 88 is nested on the inner wall of the humeral handle 1, a push block 89 is provided at one end of the push block 88, the push block 89 is nested on the inner wall of the humeral handle 1, a wedge block 810 is fixedly connected to the top of the push block 89, a mounting ring 811 is fixedly installed at the bottom end of the reverse shoulder humeral body 2, a telescopic rod 812 is elastically installed on the inner wall of the mounting ring 811, a clamping block 813 is fixedly installed at one end of the telescopic rod 812, and one end of the clamping block 813 is in contact with the wedge block 810.

[0048] In this embodiment, the rotation of the rotating rod 73 drives the meshing plate 2 81 to rotate synchronously, and the meshing plate 2 81 rotates while engaging the bevel gear 2 82 to rotate. The bevel gear 2 82 rotates while driving the input end of the bevel gear set 2 84 to rotate synchronously through the transmission rod 83. The input end of the bevel gear set 2 84 rotates while engaging the output end of the bevel gear set 2 84 to rotate. The output end of the bevel gear set 2 84 rotates while driving the crankshaft 85 to rotate. A claw 86 is fixedly connected to one side of the crankshaft 85. The crankshaft 85 rotates while driving the claw 86 to rotate. The bottom edge of the claw 86 is a notch structure that fits the inclined surface of the special-shaped rack 87. When the crank 85 drives the claw 86 to rotate to the highest point of the circular motion, during this process, the notch structure at the bottom of the claw 86 slides along the inclined surface of the special-shaped rack 87, and the outer surface of the bottom end of the claw 86 slides and contacts the vertical surface of the special-shaped rack 87. When the crank 85 rotates and drives the claw 86 to continue to rotate to the lowest point of the circular motion, under the rotation of the crank 85, the crank 85 drives the outer surface of the bottom end of the claw 86 to press against the special-shaped rack 87. The outer surface of the bottom end of the claw 86 pushes the special-shaped rack 87 to slide under the continuous rotation of the crank 85. The special-shaped rack 87 slides and pushes the push block 1 88 to slide on the inner wall of the humeral handle 1. When the push block 1 88 slides, the inclined surface at one end gradually approaches and contacts the inclined surface at the bottom end of the push block 2 89. Under the continuous lateral force of the push block 1 88, the bottom end of the push block 2 89 contacts the inclined surface of the push block 1 88 and slides. Since the push block 2 89 is vertically nested on the inner wall of the humeral handle 1, the bottom end of the push block 2 89 is pushed by the push block When the pushing force of one 88 is applied, the push block 89 is pushed upward in the vertical direction, contacts and pushes one end of the push block 89 to slide upward, and the push block 89 slides upward while driving the wedge block 810 to slide synchronously, and the wedge block 810 contacts and squeezes the clamping block 813 while sliding, and the clamping block 813 is stressed and pushes the telescopic rod 812 to contract, and when the bottom end of the anti-shoulder humeral body 2 completely contacts the top end of the humeral stem 1, the wedge block 810 squeezes the clamping block 813 into place, and at this time, the anti-shoulder humeral body 2 achieves a preliminary clamping effect with the humeral stem 1 through the mounting ring 811;

[0049] After that, the medical staff waits for the bone cement to completely harden, and then completely fixes the reverse shoulder humeral body 2 and humeral stem 1, and assembles the glenoid liner 3. The metal glenoid back plate 5 is fixed and installed on the bone section on one side of the patient's shoulder joint through the metal glenoid back plate fixing screws 6, so that the glenosphere head 4 contacts the glenoid liner 3, and then the skin at the patient's shoulder joint is sutured to complete the implantation and installation of the shoulder joint prosthesis.

[0050] By setting the clamping claw 86 and the special-shaped rack 87, and setting the linkage cooperation between the push block 1 88 and the push block 2 89, the initial clamping connection between the reverse shoulder humerus body 2 and the humeral stem 1 is achieved. At the same time, the special configuration of the special-shaped rack 87 is utilized to avoid secondary resetting caused by external force factors after the reverse shoulder humerus body 2 and the humeral stem 1 are clamped, and the clamping effect between the reverse shoulder humerus body 2 and the humeral stem 1 is avoided, thereby further ensuring the initial clamping effect between the reverse shoulder humerus body 2 and the humeral stem 1 and improving the connection stability between the reverse shoulder humerus body 2 and the humeral stem 1.

[0051] The present application also provides a method for implanting a modular shoulder joint prosthesis, the steps of which are as follows:

[0052] S1. The medical staff fills bone cement into the patient's humeral medullary cavity and inserts the humeral stem 1, and pushes the bottom end of the reverse shoulder humeral body 2 to approach and contact the top end of the humeral stem 1;

[0053] S2, using the force of the humeral body 2 contacting the humeral stem 1 to drive the support assembly 7 to operate, support the inner wall of the patient's humeral medullary cavity, and complete the implantation of the humeral stem 1 with the help of bone cement;

[0054] S3, while the support component 7 is running, the auxiliary component 8 is linked to assist the clamping between the humeral body 2 and the humeral stem 1 through the auxiliary component 8;

[0055] S4. After the bone cement is completely hardened, the medical staff assembles the glenoid liner 3 and the metal glenoid back plate 5 in sequence, and after the glenosphere head 4 and the glenoid liner 3 are in contact with each other, the wound at the patient's shoulder joint is sutured to complete the implantation of the shoulder joint prosthesis.

[0056] The working principle provided by the present invention is that the medical staff first cuts the skin at the patient's shoulder joint and separates the muscles at the shoulder joint to expose the bone structure at the patient's shoulder joint, and then removes the diseased humeral head;

[0057] The user fills bone cement in the humeral medullary cavity and inserts the humeral stem 1. Then the medical staff aligns the reverse shoulder humeral body 2 with the humeral stem 1 and pushes the bottom end of the reverse shoulder humeral body 2 to approach and contact the top end of the humeral stem 1. The reverse shoulder humeral body 2 drives the rack 710 at the bottom end to pass through and engage with the flat gear 71 to rotate. When the flat gear 71 rotates, it drives the input end of the bevel gear set 72 to rotate synchronously. When the input end of the bevel gear set 72 rotates, it engages with the output end of the bevel gear set 72 to rotate. When the output end of the bevel gear set 72 rotates, it drives the bottom end to rotate. The rod 73 rotates, and the rotating rod 73 drives the meshing plate 74 to rotate synchronously. The meshing plate 74 rotates and the meshing bevel gear 75 rotates. The bevel gear 75 drives the screw rod 76 to rotate synchronously. Under the rotation of the screw rod 76, the threaded base 77 sleeved on the outer surface of the screw rod 76 slides against the inner wall of the limit ring 78. The threaded base 77 slides and drives the support pad 79 to be ejected. Since there is a gap between the humeral stem 1 and the inner wall of the humeral medullary cavity, the inner wall of the humeral medullary cavity is pre-supported by multiple groups of support pads 79 arranged at equal angles.

[0058] When the rotating rod 73 rotates, it drives the meshing plate 2 81 to rotate synchronously. When the meshing plate 2 81 rotates, it engages the bevel gear 2 82 to rotate. When the bevel gear 2 82 rotates, it drives the input end of the bevel gear set 2 84 to rotate synchronously through the transmission rod 83. When the input end of the bevel gear set 2 84 rotates, it engages the output end of the bevel gear set 2 84 to rotate. When the output end of the bevel gear set 2 84 rotates, it drives the crankshaft 85 to rotate. When the crankshaft 85 rotates, it drives one end of the claw 86 to gradually rise. When one end of the claw 86 gradually rises, it drives the other end of the claw 86 to slide along the inclined surface of the special-shaped rack 87. When one end of the claw 86 is lifted to the highest point, the other end of the claw 86 slides and falls to contact the vertical surface of the special-shaped rack 87. When the crankshaft 85 continues to rotate, When the crank 85 rotates, one end of the claw 86 is gradually pressed down, and the other end of the claw 86 contacts and pushes the vertical surface of the special-shaped rack 87, so that the special-shaped rack 87 slides. When the special-shaped rack 87 slides, it pushes the push block 1 88 to slide on the inner wall of the humeral stem 1. When the push block 1 88 slides, one end contacts and pushes one end of the push block 2 89 to slide upward. When the push block 2 89 slides, it drives the wedge block 810 to slide synchronously. When the wedge block 810 slides, it contacts and squeezes the clamping block 813. The clamping block 813 is stressed and pushes the telescopic rod 812 to retract. When the bottom end of the anti-shoulder humeral body 2 completely contacts the top end of the humeral stem 1, the wedge block 810 squeezes the clamping block 813 into place. At this time, the anti-shoulder humeral body 2 achieves a preliminary clamping effect with the humeral stem 1 through the mounting ring 811.

[0059] After that, the medical staff waits for the bone cement to completely harden, and then completely fixes the reverse shoulder humeral body 2 and humeral stem 1, and assembles the glenoid liner 3. The metal glenoid back plate 5 is fixed and installed on the bone section on one side of the patient's shoulder joint through the metal glenoid back plate fixing screws 6, so that the glenosphere head 4 contacts the glenoid liner 3, and then the skin at the patient's shoulder joint is sutured to complete the implantation and installation of the shoulder joint prosthesis.

[0060] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0061] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A modular shoulder joint prosthesis, characterized in that: It comprises a humeral stem, a reverse shoulder humeral body is arranged at the top of the humeral stem, a glenoid liner is fixedly installed at the top of the reverse shoulder humeral body, one end of the glenoid liner is in contact with the glenosphere head, one end of the glenosphere head is arranged with a metal glenoid back plate, and one end of the metal glenoid back plate is arranged with a metal glenoid back plate fixing screw; Also included is a support component, the outer surface of the humeral stem is provided with a support component, and the support component is used to assist in the installation and support of the humeral stem; An auxiliary component, wherein the top of the humeral stem is provided with an auxiliary component, and the auxiliary component is used to assist the installation between the humeral stem and the humeral body; The support assembly includes a flat gear, which is rotatably mounted on the top of the humeral stem, a rack is meshed on one side of the flat gear, and the rack is fixedly mounted on the bottom end of the anti-shoulder humeral body, one end of the flat gear is connected to a bevel gear set 1, and a rotating rod is fixedly mounted on the bottom end of the bevel gear set 1, and the rotating rod is nested inside the humeral stem; The outer surface of the rotating rod is fixed with a gear plate, the top of the gear plate is meshed with a bevel gear, the bevel gear is arranged at the bottom of the humeral stem, one end of the bevel gear is fixed with a screw, and the screw is arranged at an equal angle at the bottom of the humeral stem; A threaded base is sleeved on the outer surface of one end of the screw rod, a limiting ring is sleeved on the outer surface of the threaded base, the limiting ring is fixedly mounted on the inner wall of the humeral stem, a supporting pad is fixedly mounted on one end of the threaded base, and the supporting pad is arranged at equal angles at the opening of the humeral stem.

2. The modular shoulder joint prosthesis according to claim 1, characterized in that: The auxiliary component includes two gear plates, which are sleeved on the upper part of the outer surface of the rotating rod. The two gear plates are fixedly connected to the outer surface of the rotating rod. The top of the two gear plates is meshed with two bevel gears, and one end of the two bevel gears is fixedly connected to a transmission rod, which is rotatably installed on the top of the humeral handle.

3. The modular shoulder joint prosthesis according to claim 2, characterized in that: One end of the transmission rod is fixedly connected with a bevel gear set 2, and the bevel gear set 2 is rotatably mounted on the top of the humeral handle. One end of the bevel gear set 2 is connected with a crank, and one end of the crank is provided with a claw.

4. The modular shoulder joint prosthesis according to claim 3, characterized in that: A special-shaped rack is arranged at the bottom end of the clamping claw, and a push block 1 is fixedly connected to one end of the special-shaped rack, and the push block 1 is nested on the inner wall of the humeral handle.

5. The modular shoulder joint prosthesis according to claim 4, characterized in that: A push block 2 is arranged at one end of the push block 1, and the push block 2 is nested on the inner wall of the humeral handle. A wedge block is fixedly installed on the top of the push block 2.

6. The modular shoulder joint prosthesis according to claim 5, characterized in that: A mounting ring is fixedly mounted on the bottom end of the anti-scapulohumeral body, a telescopic rod is elastically mounted on the inner wall of the mounting ring, a clamping block is fixedly mounted on one end of the telescopic rod, and one end of the clamping block is in contact with the wedge block.

Images