Auxiliary equipment for implanting reverse shoulder joint prosthesis

Abstract

The invention relates to the technical field of orthopedic surgery auxiliary instruments, and discloses reverse shoulder joint prosthesis implantation auxiliary equipment which comprises a fixing part, two positioning parts, two guiding parts and two clamping parts, the two positioning parts are symmetrically and rotatably arranged on the fixing part, the two guiding parts are symmetrically and rotatably arranged on the fixing part, and the two clamping parts are symmetrically and rotatably arranged on the fixing part. By arranging the symmetrically-distributed fixing piece, the positioning piece, the guiding piece and the clamping piece, accurate and stable implantation of the reverse shoulder joint prosthesis is achieved, the fixing piece is attached to the humerus through the bent U-shaped bottom support and is matched with an extrusion structure to achieve stable fixation of the device, the angle of the positioning piece can be flexibly adjusted, accurate positioning is achieved by attaching the positioning plate to the sectioning plane of the humerus, and the device is simple in structure and convenient to use. The angle of the guiding piece can be flexibly adjusted, the guiding piece is stably fixed through friction locking, it is ensured that the axis of the prosthesis is aligned with a bone hole, the clamping piece can be adjusted in a sliding mode, the prosthesis is stably clamped without being damaged by being matched with a limiting structure, and the problems that in the prior art, the prosthesis is prone to skewing during implantation, and bone cement wrapping is uneven are solved.

Description

Technical Field

[0001] This invention relates to the field of orthopedic surgical aids, and more particularly to an auxiliary device for reverse shoulder joint prosthesis implantation. Background Technology

[0002] This invention relates to the field of orthopedic surgical implantation aids, specifically a reverse shoulder joint prosthesis implantation aid device. In reverse shoulder joint replacement surgery, for some osteoporotic and revision cases, it is often necessary to first perform pretreatment of the proximal humeral medullary cavity, fill the molded bone groove with bone cement, and then align and press the prosthesis stem into the bone groove. The bone cement solidifies to achieve a stable connection between the prosthesis stem and the bone body.

[0003] Currently, in clinical practice, most procedures rely on the surgeon to manually control the prosthesis's alignment and insertion path, lacking rigid centering and angle locking capabilities. During prosthesis insertion, axial misalignment and implantation deviation are very likely to occur. Once the stem body becomes misaligned, it will directly compress and accumulate bone cement in one direction to one side, resulting in excessive local bone cement thickness and gaps on the other side, creating an uneven encapsulation. After bone cement accumulates and leaves cavities, it will not only reduce the tightness of the fit between the prosthesis stem and the bone body, but also easily lead to potential problems such as prosthesis loosening and stress concentration in the later stages, affecting the long-term stability of the surgery. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies by providing an auxiliary device for implanting a reverse shoulder joint prosthesis. It solves the problem that reverse shoulder joint prostheses are prone to misalignment during implantation, resulting in uneven bone cement coverage. The device achieves precise positioning, stable clamping, adjustable angle, and secure locking of the prosthesis, ensuring that bone cement evenly covers the implanted end of the prosthesis and reducing the difficulty of the surgical procedure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An auxiliary device for implanting a reverse shoulder joint prosthesis includes a fixation component, a positioning component, a guide component, and a clamping component. Two positioning components, two guide components, and two clamping components are provided. The two positioning components are symmetrically and rotatably disposed on the fixation component. The two guide components are rotatably assembled on the corresponding positioning components. Clamping components for clamping and fixing the prosthesis are slidably disposed on both guide components.

[0006] Preferably, the fixing component includes a fixed base, which is U-shaped and has fixing arms at both ends. The upper end of each fixing arm has a connecting end, which is hinged to a positioning component via a pin. A threaded rod is threaded onto the fixing arm, and a pressing block is provided at one end of the threaded rod facing the fixing arm. A rotating block is provided at the other end of the threaded rod away from the pressing block. This design achieves a stable fit between the device and the humerus, providing a stable installation foundation for the entire device. It also facilitates adjustment by the operator and prevents the device from loosening during clamping.

[0007] Preferably, the positioning component includes a rotating plate, the lower end of which is provided with a second connecting end, which is hinged to a first connecting end. The upper end of the rotating plate is provided with a positioning plate that can conform to the humeral section plane for positioning. A positioning block is fixedly provided on the rotating plate. The positioning block is rotatably connected to the guide component. The positioning block has a connecting groove and a positioning recess. The positioning recess has a positioning surface, which can flexibly adjust the positioning angle. Precise positioning is achieved by the positioning plate conforming to the humeral section plane. The positioning block provides a rotatable mounting reference for the guide component, ensuring the basic stability of the guide angle adjustment.

[0008] Preferably, the guide component includes a guide plate with a movable channel. The lower end of the guide plate has a connecting end three with a positioning boss that can be inserted into a positioning groove. The positioning boss has a positioning surface two that can fit and cooperate with the positioning surface one. The connecting end three has a pressing groove and is equipped with a threaded rod two. One end of the threaded rod two is fitted with the connecting groove, and the other end of the threaded rod two has a rotating block two that can be screwed into the pressing groove to achieve clamping and fixing. The guide component also has a connecting rod, which can realize flexible adjustment and stable locking of the guide angle. The movable channel provides a sliding track for the clamping component, and the connecting rod ensures that the two guide plates rotate synchronously, ensuring the coaxiality of the prosthesis clamping.

[0009] Preferably, both positioning surface one and positioning surface two are provided with friction-enhancing contact surfaces, which form friction lock after being put together, so as to realize the stable fixation of the guide angle, effectively increase the frictional resistance between the positioning surfaces, avoid the guide angle deviation during the implantation process, and further improve the accuracy of implantation.

[0010] Preferably, the clamping member is slidably assembled in the moving channel. The clamping member includes a first baffle, a slider and a second baffle. The slider is located between the first baffle and the second baffle. The first baffle is higher than the second baffle and can be flexibly adjusted along the guide plate to accommodate different models of prostheses. The first baffle is easy for the operator to adjust, and the second baffle can limit the position of the prosthesis to prevent it from falling off during clamping.

[0011] Preferably, the baffle is threaded with a threaded rod three, the inner end of the threaded rod three is provided with a clamping plate, and the outer end of the threaded rod three is provided with a rotating block three. The prosthesis can be stably clamped by rotation adjustment. The clamping plate fits the contour of the prosthesis, and the rotating block three is easy to apply force and is non-slip, preventing slippage during adjustment.

[0012] Preferably, the clamping plate is provided with a connecting part, the threaded rod three is rotatably connected to the connecting part, and a limiting rod is fixed on the connecting part. The limiting rod is movably limited and assembled at the corresponding limiting structure of the baffle one, which can prevent the clamping plate from rotating with the threaded rod three, ensure that the clamping plate is always in close contact with the prosthesis, avoid damage to the surface of the prosthesis, and ensure stable clamping posture.

[0013] Compared with the prior art, the present invention has the following beneficial effects: This invention achieves precise and stable implantation of a reverse shoulder joint prosthesis by setting symmetrically distributed fixation, positioning, guiding, and clamping components. The fixation component conforms to the humerus through a curved U-shaped base and, together with a compression structure, ensures stable fixation of the device. The positioning component can be flexibly adjusted in angle and achieves precise positioning by conforming to the humeral section plane through a positioning plate. The guiding component can be flexibly adjusted in angle and is firmly fixed through friction locking, ensuring that the prosthesis axis is aligned with the bone hole. The clamping component can be slidably adjusted and, together with a limiting structure, ensures stable clamping of the prosthesis without damage. This invention solves the problems of easy prosthesis misalignment and uneven bone cement coverage in existing technologies. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is an exploded view of part of the structure of the present invention; Figure 3 This is a structural view of the fastener of the present invention; Figure 4 This is a structural view of the positioning component of the present invention; Figure 5 This is a structural view of the guide component of the present invention; Figure 6 This is a view showing the position of the positioning boss in this invention; Figure 7 This is a structural view of the clamping component of the present invention; Figure 8 This is an overall structural view of the invention mounted on the humerus.

[0016] Drawing number explanation: 1. Fixing component; 11. Fixed base; 12. Fixed arm; 13. Connecting end one; 14. Extrusion block; 15. Threaded rod one; 16. Rotating block one; 17. Pin; 2. Positioning component; 21. Rotating plate; 22. Connecting end two; 23. Positioning plate; 24. Positioning block; 25. Connecting groove; 26. Positioning groove; 27. Positioning surface one; 3. Guide component; 31. Guide plate; 32. Moving channel; 33. Connecting end three; 34. Positioning boss; 35. Positioning surface two; 36. Extrusion groove; 37. Threaded rod two; 38. Rotating block two; 39. Connecting rod; 4. Clamping component; 41. Baffle one; 42. Slider; 43. Baffle two; 44. Clamping plate; 45. Connecting part; 46. Threaded rod three; 47. Rotating block three; 48. Limiting rod. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings.

[0018] The following description is intended to disclose the invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will be apparent to those skilled in the art. The basic principles of the invention defined in the following description can be used in other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0019] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or position based on the orientation or positional relationship shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing this invention and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this invention.

[0020] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0021] Example

[0022] Please see Figure 1-8An auxiliary device for implanting a reverse shoulder joint prosthesis includes a fixation component 1, a positioning component 2, a guide component 3, and a clamping component 4. Two positioning components 2, two guide components 3, and two clamping components 4 are provided, and the two positioning components 2, two guide components 3, and two clamping components 4 are symmetrically distributed, with the center of symmetry coinciding with the prosthesis implantation axis to ensure uniform force and accurate positioning after the prosthesis is clamped. The two positioning components 2 are symmetrically and rotatably mounted on the fixation component 1, with their rotation axes perpendicular to the axis of the fixing arm 12 of the fixation component 1. The two guide components 3 are rotatably mounted on their corresponding positioning components 2, with their rotation axes perpendicular to the surface of the rotating plate 21 of the positioning component 2. Clamping components 4 for clamping and fixing the prosthesis are slidably provided on both guide components 3, and the sliding direction of the clamping components 4 is consistent with the length direction of the guide plate 31 of the guide component 3.

[0023] Fixation component 1 includes a fixation base 11, a fixation arm 12, a connecting end 13, a compression block 14, a threaded rod 15, a rotating block 16, and a pin 17. The fixation base 11 is U-shaped, and its curvature matches the outer contour of the humerus, ensuring a tight fit without damaging the humerus and surrounding soft tissues. The fixation base 11 and fixation arm 12 are manufactured using a one-piece molding process, and the material is medical-grade stainless steel or medical-grade titanium alloy, possessing sufficient structural strength and biocompatibility to avoid complications during surgery. In case of deformation or biological rejection, the fixed base 11 has integrally formed fixed arms 12 at both ends. The two fixed arms 12 are symmetrically arranged and perpendicularly connected to the fixed base 11. The upper end of the fixed arm 12 is integrally provided with a connecting end 13. The connecting end 13 has a hinge hole adapted to the pin 17. The hinge hole passes through the upper and lower end faces of the connecting end 13. The pin 17 passes through the hinge hole and is hinged to the connecting end 22 of the positioning member 2. The two ends of the pin 17 are rounded. The holes are fitted with a clearance fit, which is controlled within a range that allows for flexible rotation without significant wobble. This ensures that the positioning component 2 can rotate smoothly around the pin 17 while preventing jamming during rotation. The fixed arm 12 has a through threaded hole along its length. The threaded rod 15 is threaded into this hole. The thread is a fine thread with a self-locking function to prevent the threaded rod 15 from loosening during clamping. The end of the threaded rod 15 facing the inside of the fixed arm 12 is fixedly connected to the extrusion block 14 by welding. The side of the extrusion block 14 facing the humerus has an arc-shaped contact surface that matches the outer contour of the humerus. The contact surface also has anti-slip textures to increase frictional resistance with the humerus and prevent slippage during clamping. The end of the threaded rod 15 away from the extrusion block 14 is fixed to the rotating block 16 by a key connection. The rotating block 16 is cylindrical with a knurled anti-slip treatment on its surface. The knurling pattern is circular, which makes it easy for the operator to hold and apply force while preventing slippage during rotation.

[0024] Positioning component 2 includes a rotating plate 21, a second connecting end 22, a positioning plate 23, a positioning block 24, a connecting groove 25, a positioning recess 26, and a first positioning surface 27. The rotating plate 21 has a rectangular plate structure, and its material is the same as that of the fixing component 1 to ensure uniform overall structural strength. The lower end of the rotating plate 21 is integrally provided with the second connecting end 22, which has a through hole coaxial with the hinge hole of the first connecting end 13. The pin 17 passes through the through hole and is hinged to the first connecting end 13. The thickness of the second connecting end 22 is adapted to the thickness of the first connecting end 13 to ensure a tight connection without shaking after hinge. The upper end of the rotating plate 21 is integrally provided with the positioning plate 23, which is rectangular. The side of the positioning plate 23 that contacts the humeral section plane is a flat and smooth surface. The contact surface is perpendicular to the plate surface of the rotating plate 21, and the contact area of ​​the positioning plate 23 is not less than 1 / 3 of the humeral section plane to ensure that... To ensure stable positioning and prevent the positioning plate 23 from slipping off the cutting plane, the mating surface of the positioning plate 23 has fine anti-slip textures, further enhancing the frictional resistance with the cutting plane and improving positioning reliability. A positioning block 24 is fixed to the side of the rotating plate 21 away from the positioning plate 23 by bolts. The bolts are made of medical-grade stainless steel and are symmetrically arranged to ensure that the positioning block 24 is firmly fixed and does not loosen. The positioning block 24 has a cuboid structure, and a connecting groove 25 and a positioning groove 26 are opened on the side facing the guide 3. The connecting groove 25 is located below the positioning groove 26. The inner wall of the connecting groove 25 has internal threads for threaded engagement with the threaded rod 37. The positioning groove 26 is a trapezoidal groove, and its inner wall is the positioning surface 27. The positioning surface 27 is a flat inclined surface that is perfectly matched with the positioning surface 35 of the guide 3 to ensure a tight fit.

[0025] Guide component 3 includes guide plate 31, moving channel 32, connecting end 33, positioning boss 34, positioning surface 35, extrusion groove 36, threaded rod 37, rotating block 38, and connecting rod 39. Guide plate 31 has a rectangular plate structure and is made of the same material as fixing component 1. The length of guide plate 31 is designed according to the length of a conventional prosthesis to ensure that it can cover the clamping and guiding stroke of the prosthesis. The lower end of guide plate 31 is integrally provided with connecting end 33, which has a block structure. On the side facing positioning block 24, there is a positioning boss 34. The positioning boss 34 is a trapezoidal boss that is perfectly matched in shape and size to the positioning groove 26 of positioning block 24. 4. It can be accurately embedded in the positioning groove 26 to achieve the initial positioning of the guide 3 and the positioning block 24. The positioning boss 34 and the positioning groove 26 adopt a clearance fit. The fit clearance ensures that the two can fit flexibly without obvious shaking. The connecting end 33 has a through hole. The through hole is coaxial with the connecting groove 25 of the positioning block 24. The threaded rod 37 passes through the through hole and is threadedly engaged with the connecting groove 25. The thread specification of the threaded rod 37 is completely matched with the internal thread of the connecting groove 25, and it also adopts a fine thread with a self-locking function. The connecting end 33 has a pressing groove 36 on the side near the rotating block 38. The pressing groove 36 is a cylindrical groove with an inner diameter that is the same as the inner diameter of the rotating block 28. The outer diameter of the rotating block 38 is matched, and the depth ensures that the rotating block 38 can generate sufficient compressive force on the connecting end 33 after being screwed in, so that the positioning surface 27 and the positioning surface 35 fit tightly together. The positioning boss 34 is provided with the positioning surface 35, which is a flat inclined surface with the same inclination angle as the positioning surface 27, ensuring that the two can fit completely together. The end of the threaded rod 37 away from the connecting groove 25 is fixed to the rotating block 38 by a key connection. The structure, material, and anti-slip treatment of the rotating block 38 are the same as those of the rotating block 16, which facilitates uniform operation by the operator. The two guide plates 31 are fixedly connected by a connecting rod 39, which is cylindrical. The shape and material are the same as the guide plate 31. The two ends of the connecting rod 39 are fixed to the middle of the two guide plates 31 by welding. The welding is fully welded to ensure a firm connection and to drive the two guide plates 31 to rotate synchronously, avoiding angular deviation between the two guide plates 31. The guide plate 31 has a moving channel 32 along its length. The moving channel 32 is a rectangular through hole. Its width is adapted to the width of the slider 42 of the clamping part 4, and its height is slightly greater than the height of the slider 42, to ensure that the slider 42 can slide flexibly along the moving channel 32 without deviation or jamming during the sliding process. The two ends of the moving channel 32 are rounded to avoid scratching the slider 42.

[0026] Both positioning surface 27 and positioning surface 35 are equipped with friction-enhancing contact surfaces. The friction-enhancing treatment is specifically carried out by sandblasting. After sandblasting, the roughness of the contact surfaces is controlled within an appropriate range. This can increase the frictional resistance after the two surfaces are bonded together, forming a reliable friction lock and achieving stable fixation of the guide 3 angle. However, excessive roughness will not cause jamming or damage to the contact surfaces during bonding. After the friction-enhanced positioning surface 27 and positioning surface 35 are bonded together, the coefficient of friction can meet the angle locking requirements of the guide 3, ensuring that the guide 3 will not shift its angle due to the force of the prosthesis advancement during the implantation process, further ensuring the accuracy of the prosthesis implantation.

[0027] The clamping component 4 is slidably assembled in the moving channel 32, including baffle 41, slider 42 and baffle 43. Slider 42 has a cuboid structure and is made of the same material as guide plate 31. The width and height of slider 42 are adapted to the width and height of moving channel 32 to ensure smooth sliding without deviation. The upper and lower ends of slider 42 are fixedly connected to baffle 41 and baffle 43 by welding, respectively. The welding is firm and there is no looseness. Baffle 41 and baffle 43 are both rectangular plates and are set perpendicular to slider 42. The height of baffle 41 is higher than that of baffle 43. The height difference ensures that the operator will not be blocked by baffle 43 when rotating threaded rod 3 46. At the same time, baffle 43 can limit the lower end of the prosthesis to prevent the prosthesis from falling downward during clamping. Baffle 1 41, slider 42 and baffle 2 43 together form a U-shaped clamping space to accommodate and limit the prosthesis. The width of the U-shaped space is designed according to the diameter of the conventional prosthesis to ensure that it can be adapted to different models of prostheses.

[0028] A through threaded hole is provided on the baffle 41 along its thickness direction. The threaded hole is threaded to the threaded rod 46. The thread specification is the same as that of the threaded rod 15 and the threaded rod 37, which are all fine threads with a self-locking function to prevent the threaded rod 46 from loosening during clamping. A clamping plate 44 is provided on the end of the threaded rod 46 facing the inner side of the clamping space. The clamping plate 44 is arc-shaped and its arc surface is adapted to the outer contour of the prosthesis to ensure that it can fit tightly with the prosthesis during clamping without damaging the surface of the prosthesis. A soft anti-slip pad made of medical silicone material is provided on the arc surface of the clamping plate 44, which can increase the frictional resistance with the prosthesis, improve the clamping stability, and avoid damage to the prosthesis caused by hard contact. The end of the threaded rod 46 away from the clamping plate 44 is fixed to the rotating block 47 by a key connection. The structure, material and anti-slip treatment of the rotating block 47 are the same as those of the rotating block 16 and the rotating block 38, which facilitates uniform operation and force application by the operator and avoids slippage during rotation.

[0029] A connecting part 45 is integrally formed on the side of the clamping plate 44 away from the arc-shaped surface. The connecting part 45 is a cylindrical boss with a blind hole in its center. A bearing is installed in the blind hole. One end of the threaded rod 46, which is connected to the clamping plate 44, is inserted into the blind hole and has an interference fit with the inner ring of the bearing. This achieves a rotatable connection between the threaded rod 46 and the connecting part 45, ensuring that the clamping plate 44 can move smoothly when the threaded rod 46 rotates and will not rotate with the threaded rod 46, thus avoiding damage to the surface of the prosthesis. Two limiting rods 48 are symmetrically provided on the connecting part 45. The limiting rods 48 are cylindrical and integrally formed with the connecting part 45. The material is the same as that of the clamping plate. 44 is consistent with the baffle 41. Two limiting holes are opened on the baffle 41 corresponding to the position of the limiting rod 48. The limiting holes are through circular holes with an inner diameter that matches the outer diameter of the limiting rod 48. The clearance fit is adopted to ensure that the limiting rod 48 can slide flexibly along the limiting holes and at the same time play a limiting role. This further prevents the clamping plate 44 from rotating with the threaded rod 46 and ensures that the clamping plate 44 always maintains the correct clamping posture and fits tightly with the prosthesis. The length of the limiting rod 48 is greater than the thickness of the baffle 41 to ensure that it will not fall out of the limiting hole during the sliding process. The end of the limiting rod 48 is rounded to avoid scratching the inner wall of the limiting hole.

[0030] In use, the operator places the U-shaped fixing base 11 against the outer side of the humerus, adjusts the position of the fixing base 11 so that the two fixing arms 12 are symmetrically distributed on both sides of the humerus, and the curved surface of the fixing base 11 is completely in contact with the outer contour of the humerus, ensuring that the fixing base 11 is evenly stressed. Then, the operator holds the rotating plate 21 and rotates the rotating plate 21 of the positioning component 2, so that the rotating plate 21 rotates smoothly around the pin 17, driving the positioning plate 23 to move until the flat contact surface of the positioning plate 23 is completely in contact with the plane of the humerus that has been cut off. After contact, the operator uses their hand to... Press the positioning plate 23 to ensure a tight fit without looseness, thus achieving the initial positioning of the equipment. Finally, the operator holds the rotating block 16 and rotates the rotating block 16 on the two fixed arms 12 synchronously and slowly. The rotating block 16 drives the threaded rod 15 to move axially along the threaded hole of the fixed arm 12, thereby driving the pressing block 14 to move towards the humerus until the arc-shaped contact surfaces of the two pressing blocks 14 are tightly fitted with both sides of the humerus, and the applied clamping force is sufficient to fix the entire equipment, ensuring that the equipment will not shift or shake during subsequent operations. The prosthesis clamping process can be operated collaboratively by two doctors. One doctor holds the reverse shoulder joint prosthesis, aligning the implanted end of the prosthesis with the pre-designed bone hole on the humerus, keeping the prosthesis vertical. The other doctor holds either baffle 41 or baffle 43 and pushes the slider 42 of the clamping member 4, allowing the slider 42 to slide smoothly along the moving channel 32 of the guide plate 31, moving the two clamping members 4 to a suitable clamping position below the upper end of the prosthesis. This ensures that the two clamping members 4 are symmetrically distributed on both sides of the prosthesis, and that the clamping plate 44 is aligned with the clamping area of ​​the prosthesis. Subsequently, the operators simultaneously and slowly... Slowly rotate the rotating block 47 on the two clamping parts 4. The rotating block 47 drives the threaded rod 46 to move axially along the threaded hole of the baffle 41, which in turn drives the clamping plate 44 to move towards the prosthesis until the arc-shaped surface of the two clamping plates 44 is tightly attached to the surface of the prosthesis. The applied clamping force is sufficient to fix the prosthesis and ensure that the prosthesis will not loosen or shift. During this process, the limiting rod 48 slides synchronously along the limiting hole of the baffle 41, which effectively prevents the clamping plate 44 from rotating with the threaded rod 46 and ensures that the clamping plate 44 is always tightly attached to the surface of the prosthesis to avoid damage to the prosthesis. After the prosthesis is clamped, the operator holds the rotating block 38 and slowly rotates it in the opposite direction. This causes the threaded rod 37 to move outward along the connecting groove 25 of the positioning block 24, gradually moving the rotating block 38 away from the compression groove 36 on the connecting end 33. At this time, the compressive force of the rotating block 38 on the connecting end 33 gradually disappears, the pressure between the positioning surface 27 and the positioning surface 35 decreases, and the two can separate relative to each other. The guide plate 31 can rotate flexibly around the threaded rod 37. Subsequently, the operator pushes the guide plate 31 by hand. Since the two guide plates 31 are fixedly connected by the connecting rod 39, the two guide plates 31 rotate synchronously, causing the clamped prosthesis to adjust its angle synchronously. During the adjustment process, the angle can be adjusted by... The prosthesis is aligned visually or with the aid of surgical instruments until the implantation end is precisely aligned with the bone hole on the humerus, and the axis of the prosthesis is completely coincident with the axis of the bone hole. This ensures that the prosthesis can be smoothly implanted along the axis of the bone hole. After the angle adjustment is completed, the operator slowly rotates the rotating block 38 forward, which drives the threaded rod 37 to move inward along the connecting groove 25. This causes the rotating block 38 to gradually screw into the compression groove 36, generating a uniform compression force on the connecting end 33. This, in turn, pushes the positioning boss 34 into the positioning groove 26, so that the positioning surface 35 and the positioning surface 27 are tightly fitted. The frictional resistance between the two is used to achieve a stable locking of the angle of the guide 3, ensuring that the guide 3 will not deviate in angle during the implantation of the prosthesis. After the guide element 3 is locked at the angle, two operators work together to slowly and evenly push the entire prosthesis towards the bone hole on the humerus. Under the guidance of the guide element 3, the implantation end of the prosthesis is smoothly inserted into the bone hole along the axis of the bone hole. During the pushing process, the force is kept even to avoid excessive force that could cause the prosthesis to tilt or damage the bone hole. Because the guide element 3 is fixed at the angle and the clamping element 4 firmly clamps the prosthesis, the axis of the prosthesis always remains aligned with the axis of the bone hole during the implantation process, and there will be no tilting or displacement. The bone cement in the bone hole will be evenly squeezed by the implantation end of the prosthesis, achieving uniform wrapping of the implantation end of the prosthesis, avoiding unidirectional accumulation of bone cement, uneven wrapping or gaps, and ensuring the tight fit between the prosthesis and the bone. When the prosthesis is implanted to the preset depth, the pushing of the prosthesis is stopped, thus completing the stable implantation of the prosthesis.

[0031] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments, and any modifications or variations of the embodiments of the present invention may be made without departing from the stated principles.

Claims

1. A reverse shoulder joint prosthesis implantation auxiliary device, characterized in that, It includes a fixing component (1), a positioning component (2), a guide component (3), and a clamping component (4). There are two positioning components (2), two guide components (3), and two clamping components (4). The two positioning components (2) are symmetrically and rotatably arranged on the fixing component (1). The two guide components (3) are rotatably assembled on the corresponding positioning components (2). The clamping components (4) for clamping and fixing the prosthesis are slidably arranged on the two guide components (3).

2. The auxiliary device for reverse shoulder joint prosthesis implantation according to claim 1, characterized in that, The fixing component (1) includes a fixing base (11), which is U-shaped. Both ends of the fixing base (11) are provided with fixing arms (12). The upper end of the fixing arm (12) is provided with a connecting end (13). The connecting end (13) is hinged to the positioning component (2) through a pin (17). The fixing arm (12) is threaded with a threaded rod (15). The end of the threaded rod (15) facing the fixing arm (12) is provided with a pressing block (14). The end of the threaded rod (15) away from the pressing block (14) is provided with a rotating block (16).

3. The auxiliary device for reverse shoulder joint prosthesis implantation according to claim 1, characterized in that, The positioning component (2) includes a rotating plate (21), the lower end of which is provided with a connecting end two (22), the connecting end two (22) is hinged to the connecting end one (13), the upper end of which is provided with a positioning plate (23) that can conform to the cutting plane of the humerus for positioning, the rotating plate (21) is fixedly provided with a positioning block (24), the positioning block (24) is rotatably connected to the guide component (3), the positioning block (24) is provided with a connecting groove (25) and a positioning groove (26), and the positioning groove (26) is provided with a positioning surface one (27).

4. The auxiliary device for reverse shoulder joint prosthesis implantation according to claim 3, characterized in that, The guide member (3) includes a guide plate (31), the guide plate (31) has a moving channel (32), the lower end of the guide plate (31) has a connecting end three (33), the connecting end three (33) has a positioning boss (34) that can be inserted into the positioning groove (26), the positioning boss (34) has a positioning surface two (35) that can fit and cooperate with the positioning surface one (27), the connecting end three (33) has an extrusion groove (36), the connecting end three (33) is equipped with a threaded rod two (37), one end of the threaded rod two (37) is set to cooperate with the connecting groove (25), the other end of the threaded rod two (37) has a rotating block two (38) that can be screwed into the extrusion groove (36) to achieve pressing and fixing, and the guide member (3) also has a connecting rod (39).

5. The auxiliary device for reverse shoulder joint prosthesis implantation according to claim 4, characterized in that, Both the first positioning surface (27) and the second positioning surface (35) are provided with friction-enhancing contact surfaces. After they are put together, they form a friction lock, thereby achieving a stable and fixed angle of the guide component (3).

6. The auxiliary device for reverse shoulder joint prosthesis implantation according to claim 5, characterized in that, The clamping member (4) is slidably assembled in the moving channel (32). The clamping member (4) includes a first baffle (41), a slider (42) and a second baffle (43). The slider (42) is located between the first baffle (41) and the second baffle (43). The first baffle (41) is higher than the second baffle (43).

7. The auxiliary device for reverse shoulder joint prosthesis implantation according to claim 6, characterized in that, The baffle (41) is threaded with a threaded rod (46), the inner end of the threaded rod (46) is provided with a clamping plate (44), and the outer end of the threaded rod (46) is provided with a rotating block (47).

8. The auxiliary device for reverse shoulder joint prosthesis implantation according to claim 7, characterized in that, The clamping plate (44) is provided with a connecting part (45), the threaded rod (46) is rotatably connected to the connecting part (45), and a limiting rod (48) is fixed on the connecting part (45). The limiting rod (48) is movably limited and assembled at the corresponding limiting structure of the baffle (41).

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