A modular shoulder joint prosthesis substrate and implantation method thereof

Abstract

The present invention provides a substrate for a modular shoulder joint prosthesis and an implantation method thereof, and relates to the technical field of medical prostheses. The substrate comprises an exoskeleton cage, wherein an inner cage is fixedly connected to the inside of the exoskeleton cage, an intermediate cage is slidably connected between the exoskeleton cage and the inner cage, one end of the exoskeleton cage is plugged into the human glenoid position, the other end of the exoskeleton cage is provided with a fixing plate, the fixing plate and the exoskeleton cage are fixed to the human glenoid position by screws, the other side of the fixing plate is plugged with a glenosphere head, the exoskeleton cage and the inner cage are used to penetrate into the human glenoid bone, the exoskeleton cage and the inner cage are used to determine the position of the glenosphere head, and fix the position of the glenosphere head. By providing an intermediate cage and a fixing plate, the present invention can not only fix the substrate on the human body when the shoulder joint prosthesis is installed, but also make the installation position of the glenosphere head more accurate.

Description

Technical Field

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

[0002] A high shoulder prosthesis is a medical device that is mainly used to replace a damaged or painful shoulder joint. By implanting a shoulder prosthesis, the pain and discomfort of the patient's shoulder joint can be solved. During the implantation of the shoulder prosthesis, a baseplate is required so that the glenosphere head can be fixed on the human glenoid.

[0003] During the implantation process of the substrate in the existing shoulder joint prosthesis, the bone cage on the substrate needs to be inserted into the patient's bone. Since one end of the bone cage is round, it is more laborious to insert it. At the same time, after the bone cage is implanted, when the pressure on the top of the bone cage is removed, the bone cage will move backward, which may easily cause the position of the substrate to change, resulting in an angle deviation of the glenosphere head when it is installed and fixed, which may easily cause problems in the subsequent installation of the prosthesis. Therefore, the present invention provides a substrate for a modular shoulder joint prosthesis and an implantation method thereof 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 base plate and an implantation method thereof to solve the problems that the existing base plate is inconvenient to install and the accuracy of the position of the glenosphere head cannot be determined during installation.

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

[0006] A base plate of a modular shoulder joint prosthesis comprises an exoskeleton cage, an inner cage is fixedly connected to the inside of the exoskeleton cage, an intermediate cage is slidably connected between the exoskeleton cage and the inner cage, one end of the exoskeleton cage is inserted in the position of the human glenoid cavity, the other end of the exoskeleton cage is provided with a fixing plate, the fixing plate and the exoskeleton cage are fixed in the position of the human glenoid cavity by screws, a glenosphere head is inserted in the other side of the fixing plate, the exoskeleton cage and the inner cage are used to penetrate into the bone at the human glenoid cavity, the exoskeleton cage and the inner cage are used to determine the position of the glenosphere head and fix the position of the glenosphere head, and the intermediate cage is used to axially cut the bone between the exoskeleton cage and the inner cage, so that the exoskeleton cage and the inner cage are fixed in the human glenoid cavity.

[0007] Optionally, the exoskeleton cage includes a positioning plate, the positioning plate is provided with mounting holes at equal intervals, and a placement hole is provided in the middle of the positioning plate.

[0008] Optionally, a group of first support plates in an annular array are fixedly connected to the bottom of the positioning plate, and the bottom of the first support plate is an inclined surface.

[0009] Optionally, the inner bone cage includes a first connecting plate, an adjustment groove is opened in the middle of the first connecting plate, the top of the first connecting plate is fixedly connected to a limiting block, the side of the first connecting plate is fixedly connected to a group of connecting blocks in an annular array, and the first connecting plate is fixedly connected to the placement hole of the positioning plate through the connecting block.

[0010] Optionally, a group of second support plates in an annular array are fixedly connected to the bottom of the first connecting plate, the bottom of the second support plate is an inclined surface, the length of the second support plate is greater than that of the first support plate, and a gap is provided between the second support plate and the first support plate.

[0011] Optionally, the intermediate bone cage includes a second connecting plate, a positioning block is arranged in the middle of the second connecting plate, the positioning block is rotatably connected in the adjustment groove, a limiting groove is arranged on the second connecting plate, the limiting block is slidably connected in the limiting groove, a sliding groove is arranged on the peripheral side of the second connecting plate, and a connecting block is slidably connected in the sliding groove.

[0012] Optionally, a group of cutting plates in an annular array are fixedly connected to the bottom of the second connecting plate, a slope is provided on one side of the cutting plate, an auxiliary groove is provided on the side of the cutting plate with the slope, a slope is provided on the bottom of the cutting plate, and the cutting plate is slidably connected between the second support plate and the first support plate.

[0013] Optionally, the fixed plate is provided with mounting holes with equal intervals, a group of mounting columns are fixedly connected to one side of the fixed plate, a fixing bolt is inserted in the middle of the fixed plate, a slot is provided on the top of the fixing bolt, the fixing bolt is rotatably connected to the limit plate of the fixed plate, a connecting head is provided at the bottom of the fixing bolt, and the connecting head of the fixing bolt is inserted in the positioning block.

[0014] Optionally, a group of positioning columns are symmetrically arranged at the bottom of the glenosphere head, a positioning groove is arranged between two of the positioning columns, the positioning columns are inserted into the mounting columns, and the positioning grooves are inserted into the fixing bolts.

[0015] The present invention also provides a method for implanting a base plate of a modular shoulder joint prosthesis, the method comprising the following steps:

[0016] S1. Cut the corresponding part of the patient and locate the position where the base plate is implanted;

[0017] S2. Place the exoskeleton cage in the predetermined position and use surgical instruments and tools to ensure that the cage is firmly fixed to the bone;

[0018] S3, passing the screws through the fixing plate and the positioning plate, and implanting the screws into the human body through a tool, so that the fixing plate can be fixed on the human body;

[0019] S4. Use a tool to turn the fixing bolt to rotate the middle bone cage and cut the bone at the corresponding part;

[0020] S5. Insert the glenosphere head onto the fixing plate to complete the implantation of the baseplate.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects:

[0022] In the above scheme, by setting up an outer cage, an inner cage and an intermediate cage, during the process of base plate implantation, since the outer cage, the inner cage and the intermediate cage are all provided with equal gaps, the implantation process is made easier and more labor-saving. At the same time, after the outer cage, the inner cage and the intermediate cage are implanted into the human body, the cutting plate can cut part of the bone in the gap by rotating the intermediate cage, and the uncut bone will be stuck in the auxiliary groove, so that the outer cage, the inner cage and the intermediate cage can be more firmly fixed on the human glenoid cavity. At the same time, compared with the traditional structure, this structure has less bone cutting damage during use, and the patient can recover quickly after the operation.

[0023] By setting up a fixed plate, during the process of baseplate implantation, it can not only be used to assist the rotation of the middle bone cage, but also to position the glenosphere head. When the position of the glenosphere head deviates, the operator can observe it intuitively, avoiding changes in the installation angle of the glenosphere head, which may lead to deviations in the subsequent installation of the prosthesis. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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.

[0025] Figure 1 A schematic diagram of the three-dimensional structure of a base plate of a modular shoulder joint prosthesis and its implantation method;

[0026] Figure 2 It is a schematic diagram of the structure of the exoskeleton cage of the present invention;

[0027] Figure 3 This is a schematic diagram of the inner cage structure of the present invention;

[0028] Figure 4 A bottom view of the connection between the outer cage and the inner cage of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of the middle cage of the present invention;

[0030] Figure 6 This is a schematic diagram of the explosion structure of the fixed disk of the present invention;

[0031] Figure 7 It is a schematic diagram of the glenosphere head structure of the present invention;

[0032] Figure 8 It is a schematic diagram of the structure of the middle bone cage after rotation of the present invention.

[0033] [Reference Signs]

[0034] 1. External cage; 11. Positioning plate; 111. Placement hole; 12. First support plate; 2. Internal cage; 21. First connecting plate; 211. Adjustment slot; 212. Limit block; 213. Connecting block; 22. Second support plate; 3. Intermediate cage; 31. Second connecting plate; 311. Positioning block; 312. Limit slot; 313. Slide; 32. Cutting plate; 321. Auxiliary slot; 4. Fixing plate; 41. Mounting column; 42. Limiting plate; 43. Fixing bolt; 431. Connecting head; 5. Screw; 6. Glenoid head; 61. Positioning column; 62. Positioning slot.

[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 following is a detailed description of a modular shoulder joint prosthesis substrate and its implantation method provided by the present invention 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 4As shown, an embodiment of the present invention provides a base plate of a modular shoulder joint prosthesis, including an exoskeleton cage 1, an inner cage 2 is fixedly connected inside the exoskeleton cage 1, an intermediate cage 3 is slidably connected between the exoskeleton cage 1 and the inner cage 2, one end of the exoskeleton cage 1 is inserted in the human glenoid position, and the other end of the exoskeleton cage 1 is provided with a fixing plate 4, the fixing plate 4 and the exoskeleton cage 1 are fixed in the human glenoid position by screws 5, a glenosphere head 6 is inserted on the other side of the fixing plate 4, the exoskeleton cage 1 and the inner cage 2 are used to penetrate into the bone at the human glenoid, the exoskeleton cage 1 and the inner cage 2 are used to determine the position of the glenosphere head 6 and fix the position of the glenosphere head 6, and the intermediate cage 3 is used to axially cut the space between the exoskeleton cage 1 and the inner cage 2. The bone between the outer cage 1 and the inner cage 2 is fixed to the human glenoid cavity. When implanting the shoulder joint prosthesis, the operator first needs to cut the corresponding position of the patient's glenoid cavity and locate the position to be implanted. Then, the outer cage 1 is placed at the located position and inserted into the corresponding position of the patient's body through a tool. Then, the operator needs to place the fixing plate 4 on one side of the outer cage 1 and insert the screw 5 into the glenoid cavity so that the fixing plate 4 and the outer cage 1 are firmly fixed on the glenoid cavity. Then, the fixing bolt 43 is rotated by a tool to rotate the middle cage 3. Finally, the glenosphere head 6 is inserted into the fixing bolt 43 to fix the glenosphere head 6 on the fixing plate 4.

[0042] In this embodiment, if Figures 1 to 4 As shown, after the outer cage 1 is inserted into the human glenoid cavity, part of the bone at the glenoid cavity will enter the inner cage 2, and at the same time, part of the bone will enter between the two adjacent first support plates 12 and the two adjacent second support plates 22. When the middle cage 3 rotates, the cutting plate 32 will cut part of the bone.

[0043] like Figures 2 to 6As shown, the outer cage 1 includes a positioning plate 11, the positioning plate 11 is provided with mounting holes with equal intervals, a placement hole 111 is provided in the middle of the positioning plate 11, a first support plate 12 of a circular array is fixedly connected to the bottom of the positioning plate 11, and the bottom of the first support plate 12 is an inclined surface, and the inner cage 2 includes a first connecting plate 21, an adjustment groove 211 is provided in the middle of the first connecting plate 21, a limiting block 212 is fixedly connected to the top of the first connecting plate 21, and a connection block 213 of a circular array is fixedly connected to the side of the first connecting plate 21. The first connecting plate 21 is fixedly connected to the placement hole 111 of the positioning plate 11 through the connection block 213, and a second support plate 22 of a circular array is fixedly connected to the bottom of the first connecting plate 21, and the bottom of the second support plate 22 is an inclined surface, and the length of the second support plate 22 is greater than that of the first connecting plate 21. Due to the length of the first support plate 12, a gap is set between the second support plate 22 and the first support plate 12, the middle bone cage 3 includes a second connecting plate 31, a positioning block 311 is set in the middle of the second connecting plate 31, the positioning block 311 is rotatably connected in the adjustment groove 211, a limiting groove 312 is set on the second connecting plate 31, the limiting block 212 is slidably connected in the limiting groove 312, a sliding groove 313 is set on the peripheral side of the second connecting plate 31, and the connecting block 213 is slidably connected in the sliding groove 313, a group of cutting plates 32 in an annular array are fixedly connected to the bottom of the second connecting plate 31, a bevel is set on one side of the cutting plate 32, an auxiliary groove 321 is set on the side of the cutting plate 32 with the bevel, a bevel is set at the bottom of the cutting plate 32, and the cutting plate 32 is slidably connected between the second support plate 22 and the first support plate 12.

[0044] When the exoskeleton cage 1 is implanted into the glenoid region, the first support plate 12 and the second support plate 22 are inserted into the bone in the glenoid region. When the first support plate 12 and the second support plate 22 are inserted into the bone, part of the bone will be located in the second support plate 22 of the annular array, and part of the bone will be located between the two adjacent first support plates 12 and the two adjacent second support plates 22. When the operator rotates the fixing bolt 43 by a tool, the connector 431 of the fixing bolt 43 is inserted into the positioning block 311 of the second connecting plate 31. The second connecting plate 31 will rotate synchronously with the fixing bolt 43. When the second connecting plate 31 rotates, the cutting plate 32 located in the annular array below the second connecting plate 31 will rotate synchronously and cut the bone located between the first support plate 12 and the second support plate 22. Since the cutting plate 32 is provided with an auxiliary groove 321, when the other side of the limiting groove 312 hits the limiting block 212, the second connecting plate 31 stops rotating. At this time, there is still bone located in the auxiliary groove 321 of the cutting plate 32, so that the bone located in the auxiliary groove 321 can remain intact.

[0045] In this embodiment, if Figures 2 to 6As shown, the length of the limiting groove 312 determines the rotation angle of the second connecting plate 31, and the length of the auxiliary groove 321 is greater than the length of the limiting groove 312. When the second connecting plate 31 finishes rotating, the end of the auxiliary groove 321 is still located between the first support plate 12 and the second support plate 22, and the bone located in the auxiliary groove 321 will not be cut by the cutting plate 32.

[0046] like Figures 6 to 8 As shown, the fixing plate 4 is provided with mounting holes with equal intervals, a group of mounting posts 41 are fixedly connected to one side of the fixing plate 4, a fixing bolt 43 is inserted in the middle of the fixing plate 4, a notch is provided on the top of the fixing bolt 43, the fixing bolt 43 is rotatably connected to the limit plate 42 of the fixing plate 4, a connector 431 is provided at the bottom of the fixing bolt 43, the connector 431 of the fixing bolt 43 is inserted in the positioning block 311, a group of positioning posts 61 are symmetrically provided at the bottom of the glenosphere head 6, a positioning groove 62 is provided between the two positioning posts 61, the positioning post 61 is inserted into the mounting post 41, and the positioning groove 62 is inserted into the fixing bolt 43. When the first support plate 12 is inserted into the human glenoid region, the operator needs to place the fixing plate 4 on one side of the exoskeleton cage 1 so that the fixing bolt 4 The connecting head 431 of 3 is inserted into the positioning block 311 of the second connecting plate 31, and the mounting holes on the fixing plate 4 and the mounting holes on the positioning plate 11 are made to correspond one to one. Then the operator needs to insert the screws 5 into the corresponding mounting holes and implant the screws 5 into the human body through the tool so that the fixing plate 4 can be fixed on one side of the positioning plate 11. Then the operator needs to insert the tool into the notch of the fixing bolt 43 to rotate the fixing bolt 43. The middle bone cage 3 is rotated by rotating the fixing bolt 43. When the middle bone cage 3 stops rotating, the operator removes the tool and inserts the positioning groove 62 of the glenosphere head 6 into the top of the fixing bolt 43. At the same time, the positioning columns 61 on both sides are inserted into the mounting columns 41 so that the glenosphere head 6 can be fixed on the fixing plate 4 to complete the implantation of the base plate.

[0047] In this embodiment, if Figures 6 to 8 As shown, the top of the fixing bolt 43 is a hexagonal prism. During the rotation of the fixing bolt 43, when the intermediate bone cage 3 stops rotating before it has rotated to the limit position, when the glenosphere head 6 is installed, although the positioning groove 62 can be inserted into the top of the fixing bolt 43, the positioning column 61 cannot be connected to the installation column 41. At this time, the operator can realize that the glenosphere head 6 cannot be installed, so the operator will recheck the implantation process and re-rotate the intermediate bone cage 3 to a suitable position to ensure that the glenosphere head 6 can be installed normally and avoid deviation in the installation position of the glenosphere head 6.

[0048] The present invention also provides a method for implanting a base plate of a modular shoulder joint prosthesis, the method comprising the following steps:

[0049] S1. Cut the corresponding part of the patient and locate the position where the base plate is implanted;

[0050] S2, placing the exoskeleton cage 1 at a predetermined position, and using surgical instruments and tools to ensure that the cage is firmly fixed on the bone;

[0051] S3, passing the screw 5 through the fixing plate 4 and the positioning plate 11, and implanting the screw 5 into the human body through a tool, so that the fixing plate 4 can be fixed on the human body;

[0052] S4, using a tool to rotate the fixing bolt 43 to rotate the middle bone cage 3 and cut the bone at the corresponding position;

[0053] S5. Insert the glenosphere head 6 onto the fixing plate 4 to complete the implantation of the base plate.

[0054] The use process of the technical solution of the present invention is as follows:

[0055] First, the operator needs to cut the corresponding position of the patient's glenoid cavity and locate the position to be implanted, then place the exoskeleton cage 1 at the located position, and insert the exoskeleton cage 1 into the corresponding position of the patient through a tool. When the exoskeleton cage 1 is implanted into the glenoid cavity area, the first support plate 12 and the second support plate 22 will be inserted into the bone in the glenoid cavity area. When the first support plate 12 and the second support plate 22 are inserted into the bone, part of the bone will be located in the second support plate 22 of the annular array, and part of the bone will be located between the two adjacent first support plates 12 and the two adjacent second support plates 22. When the operator turns the fixing bolts with the tool After 43, since the connecting head 431 of the fixing bolt 43 is inserted into the positioning block 311 of the second connecting plate 31, the second connecting plate 31 will rotate synchronously with the fixing bolt 43. When the second connecting plate 31 rotates, the cutting plate 32 located in the annular array below the second connecting plate 31 will rotate synchronously and cut the bone located between the first support plate 12 and the second support plate 22. Since the cutting plate 32 is provided with an auxiliary groove 321, when the other side of the limiting groove 312 hits the limiting block 212, the second connecting plate 31 stops rotating. At this time, there is still bone located in the auxiliary groove 321 of the cutting plate 32, so that the bone located in the auxiliary groove 321 can remain intact.

[0056] After the first support plate 12 is inserted into the human glenoid region, the operator needs to place the fixing plate 4 on one side of the exoskeleton cage 1 so that the connecting head 431 of the fixing bolt 43 is inserted into the positioning block 311 of the second connecting plate 31, and the mounting holes on the fixing plate 4 and the mounting holes on the positioning plate 11 correspond one to one. Then the operator needs to insert the screws 5 into the corresponding mounting holes and implant the screws 5 into the human body through a tool so that the fixing plate 4 can be fixed on one side of the positioning plate 11. Then the operator needs to insert the tool into the notch of the fixing bolt 43 to rotate the fixing bolt 43. By rotating the fixing bolt 43, the intermediate bone cage 3 is rotated. When the intermediate bone cage 3 stops rotating, the operator removes the tool and inserts the positioning groove 62 of the glenosphere head 6 into the fixing bolt The top of 43 is formed by inserting the positioning posts 61 on both sides into the mounting posts 41, so that the glenosphere head 6 can be fixed on the fixing plate 4 to complete the implantation of the base plate. The top of the fixing bolt 43 is a hexagonal prism. During the rotation of the fixing bolt 43, when the intermediate bone cage 3 stops rotating when it has not rotated to the limit position, when the glenosphere head 6 is being installed, although the positioning groove 62 can be inserted into the top of the fixing bolt 43, the positioning post 61 cannot be connected to the mounting post 41. At this time, the operator can be aware that the glenosphere head 6 cannot be installed, so the operator will recheck the implantation process and re-rotate the intermediate bone cage 3 to a suitable position to ensure that the glenosphere head 6 can be installed normally and avoid deviation in the installation position of the glenosphere head 6.

[0057] 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.

[0058] 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 base plate for a modular shoulder joint prosthesis, characterized in that: It comprises an exoskeleton cage, wherein an inner cage is fixedly connected to the inside of the exoskeleton cage, an intermediate cage is slidably connected between the exoskeleton cage and the inner cage, one end of the exoskeleton cage is inserted in the position of the human glenoid cavity, the other end of the exoskeleton cage is provided with a fixing plate, the fixing plate and the exoskeleton cage are fixed in the position of the human glenoid cavity by screws, and the other side of the fixing plate away from the exoskeleton cage is inserted with the glenosphere head; The outer bone cage and the inner bone cage are used to penetrate into the bone of the human glenoid cavity, and the outer bone cage and the inner bone cage are used to determine the position of the glenosphere head and fix the position of the glenosphere head; The intermediate bone cage is used to axially cut the bone between the outer bone cage and the inner bone cage, so that the outer bone cage and the inner bone cage are fixed at the human glenoid cavity; The exoskeleton cage comprises a positioning plate, the positioning plate is provided with mounting holes at equal intervals, and a placement hole is provided in the middle of the positioning plate; A group of first support plates in an annular array are fixedly connected to the bottom of the positioning plate, and the bottom of the first support plate is an inclined surface; The inner bone cage comprises a first connecting plate, an adjustment slot is provided in the middle of the first connecting plate, a limiting block is fixedly connected to the top of the first connecting plate, a group of connecting blocks in an annular array are fixedly connected to the side of the first connecting plate, and the first connecting plate is fixedly connected to the placement hole of the positioning plate through the connecting block; A group of second support plates in an annular array are fixedly connected to the bottom of the first connecting plate, the bottom of the second support plate is an inclined surface, the length of the second support plate is greater than the length of the first support plate, and a gap is set between the second support plate and the first support plate; The intermediate bone cage comprises a second connecting plate, a positioning block is arranged in the middle of the second connecting plate, the positioning block is rotatably connected in the adjusting groove, a limiting groove is arranged on the second connecting plate, the limiting block is slidably connected in the limiting groove, a sliding groove is arranged on the peripheral side of the second connecting plate, and a connecting block is slidably connected in the sliding groove; A group of cutting plates in an annular array are fixedly connected to the bottom of the second connecting plate, one side of the cutting plate is provided with an inclined surface, the side of the cutting plate provided with the inclined surface is provided with an auxiliary groove, the bottom of the cutting plate is provided with an inclined surface, and the cutting plate is slidably connected between the second supporting plate and the first supporting plate; The fixing plate is provided with mounting holes with equal intervals, a group of mounting columns are fixedly connected to one side of the fixing plate, a fixing bolt is inserted in the middle of the fixing plate, a notch is provided on the top of the fixing bolt, the fixing bolt is rotatably connected to the limit plate of the fixing plate, a connecting head is provided at the bottom of the fixing bolt, and the connecting head of the fixing bolt is inserted in the positioning block; When the operator rotates the fixing bolt by using a tool, the second connecting plate will rotate synchronously with the fixing bolt because the connecting head of the fixing bolt is inserted into the positioning block of the second connecting plate. When the second connecting plate rotates, the cutting plates in the annular array below the second connecting plate will rotate synchronously and cut the bone between the first supporting plate and the second supporting plate. The length of the limiting groove determines the rotation angle of the second connecting plate. At the same time, the length of the auxiliary groove is greater than that of the limiting groove. When the second connecting plate finishes rotating, the end of the auxiliary groove is still located between the first support plate and the second support plate, and the bone located in the auxiliary groove will not be cut by the cutting plate.

2. The base plate of the modular shoulder joint prosthesis according to claim 1, characterized in that: A group of positioning columns are symmetrically arranged at the bottom of the glenosphere head, a positioning groove is arranged between two positioning columns, the positioning columns are plugged into the mounting columns, and the positioning groove is plugged into the fixing bolts.

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