Biological type double action total wrist prosthesis

Abstract

This application discloses a biological dual-motion total wrist joint prosthesis, relating to the field of prosthesis structure technology. This biological dual-motion total wrist joint prosthesis achieves effective replacement of the wrist joint by incorporating a medullary rod and metacarpal fixation structure. In particular, the configuration of the palm fixation rod and rotation ball allows the prosthesis to function effectively at the wrist joint, replacing the damaged original joint and thus ensuring wrist rotation function. This structure not only effectively fixes the metacarpal bones but also improves the prosthesis's rotation angle and range of motion, avoiding the drawbacks of traditional prostheses that lack sufficient mobility to meet the patient's flexible movement needs. Wrist flexion, extension, and displacement movements are smoothly completed, significantly improving the prosthesis's performance.

Description

Technical Field

[0001] This application relates to the field of prosthetic structure technology, and more particularly to a biological dual-motion full wrist joint prosthesis. Background Technology

[0002] The wrist joint is formed by the radius and ulna of the forearm and the carpal bones of the hand, with the radiocarpal and midcarpal joints being key movement hubs. The radiocarpal joint primarily refers to the connection between the radius and the proximal carpal bones, consisting of the distal articular surface of the radius, the proximal carpal bones (especially the scaphoid and lunate bones), and surrounding ligaments. The distal articular surface of the radius is wide and concave, contacting the scaphoid and lunate bones through articular cartilage to form a complex articular surface, allowing for coordinated wrist movements in flexion, extension, and ulnar-radial deviation. Simultaneously, the distal radioulnar joint (distal radioulnar syndesmosis) maintains the relative position of the radius and ulna through the annular ligament and the stable contact between the ulnar styloid process and the distal radius, ensuring wrist stability during forearm rotation. Current biological dual-motion total wrist prostheses lack sufficient mobility, resulting in small rotation angles and limited range of motion, failing to meet the demands for flexible movement. Summary of the Invention

[0003] This application provides a biological dual-motion total wrist joint prosthesis to at least solve the problem of insufficient mobility in current biological dual-motion total wrist joint prostheses in the related art, resulting in small rotation angles and limited range of motion.

[0004] This application provides a biological dual-motion total wrist joint prosthesis, which includes a medullary rod and a metacarpal fixation structure; The spinal cord includes a rotating ball and a palm-fixing rod, wherein the rotating ball is connected to the lower end of the palm-fixing rod; The metacarpal fixation structure includes a metacarpal fixation plate and multiple bone screws. The metacarpal fixation plate has a through hole in the middle. The metacarpal fixation plate is sleeved on the palm fixation rod through the through hole. The metacarpal fixation plate and the palm fixation rod are intersected and connected. The metacarpal fixation plate is located at one end of the palm fixation rod adjacent to the rotating ball part. The metacarpal fixation plate has multiple bone screw holes. The bone screws are adapted to pass through the bone screw holes and connect to the bottom end of the metacarpal bone.

[0005] Furthermore, the palm fixing rod is frustum-shaped, the lower end diameter of the palm fixing rod is larger than the upper end diameter of the palm fixing rod, the rotating ball part is connected to the lower end of the palm fixing rod, and the diameter of the rotating ball part is larger than the lower end diameter of the palm fixing rod.

[0006] Furthermore, the length of the palm fixing rod is 10-15mm; the outer surface of the palm fixing rod is provided with a protective coating.

[0007] Furthermore, the lower end of the palm fixing rod is provided with a threaded hole, and the metacarpal fixation plate is fixed to the palm fixing rod by fasteners connected to the threaded hole.

[0008] Furthermore, the biological dual-motion full wrist joint prosthesis also includes an inner liner structure, which is spindle-shaped. The top surface of the inner liner structure has a rotating spherical groove in the middle, and the rotating ball can be rotatably engaged in the rotating spherical groove. The bottom and sides of the inner liner structure are arc-shaped.

[0009] Furthermore, the biological dual-motion full wrist joint prosthesis also includes a radial lateral cup, the top of which is provided with an arc-shaped groove, the arc-shaped groove being adapted to the bottom and side surfaces of the inner lining structure, and the inner lining structure being able to rotate within the arc-shaped groove.

[0010] Furthermore, the biological dual-motion full wrist joint prosthesis also includes a filler block structure, which is connected to the bottom of the radial lateral cup. The top of the filler block structure is provided with a groove, and the bottom of the radial lateral cup is provided with a protrusion, which is engaged in the groove.

[0011] Furthermore, the biological dual-motion full wrist joint prosthesis also includes a radial intramedullary rod, a limiting hole is provided in the middle of the filling block structure, a blind hole is provided at the bottom of the radial lateral cup corresponding to the limiting hole, and the top end of the radial intramedullary rod passes through the limiting hole and connects to the blind hole.

[0012] Furthermore, the intramedullary rod of the radius includes a square rod structure and a second interlocking screw. The square rod structure is provided with an interlocking hole. After the second interlocking screw is engaged with the steel plate located on the lateral side of the radius, it interlocks with the square rod structure through the interlocking hole.

[0013] Furthermore, the radial intramedullary rod includes a variable diameter rod body and a threaded core rod. The bottom outer side of the variable diameter rod body is provided with multiple clearance grooves, and the interior of the variable diameter rod body is provided with internal threads. The threaded core rod is disposed in the variable diameter rod body through the internal threads, and the threaded core rod can move within the variable diameter rod body to adjust the outer diameter of the variable diameter rod body.

[0014] This application presents a biological dual-motion total wrist joint prosthesis that effectively replaces the wrist joint by incorporating a medullary rod and metacarpal fixation structure. In particular, the configuration of the palm fixation rod and rotation ball allows the prosthesis to function effectively at the wrist joint, replacing the damaged original joint and thus ensuring wrist rotation function. This structure not only effectively fixes the metacarpals but also increases the prosthesis's rotation angle and range of motion, avoiding the drawbacks of traditional prostheses that lack sufficient mobility to meet patients' flexible movement needs. Wrist flexion, extension, and displacement movements are smoothly completed, significantly improving the prosthesis's performance. Attached Figure Description

[0015] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a first-view structural diagram of a biological dual-motion total wrist joint prosthesis in one embodiment of this application; Figure 2 This is a second-view structural diagram of a biological dual-motion total wrist joint prosthesis in one embodiment of this application; Figure 3 This is a first-view exploded structural diagram of a biological dual-motion total wrist joint prosthesis in one embodiment of this application; Figure 4 This is a second-view exploded structural diagram of a biological dual-motion total wrist joint prosthesis in one embodiment of this application; Figure 5 This is a schematic diagram of the exploded structure of the radial intramedullary rod in one embodiment of this application.

[0017] The diagram is labeled as follows: 1. Medullary rod, 11. Rotating ball, 12. Palm fixation rod, 2. Metacarpal fixation structure, 21. Metacarpal fixation plate, 211. Through hole, 212. Bone screw hole, 3. Lining structure, 31. Rotating ball groove, 4. Radial lateral cup, 41. Arc groove, 42. Protrusion, 5. Filler block structure, 51. Slot, 52. Limiting hole, 6. Radial intramedullary rod, 61. Square rod structure, 62. Interlocking hole, 63. Variable diameter rod, 64. Threaded core rod, 65. Gap groove. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.

[0019] It should be noted that, in the description of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. The terms "first," "second," etc., in this application are used to distinguish similar objects and are not used to describe a specific order or sequence.

[0020] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, this application provides a biological dual-motion total wrist joint prosthesis, which includes a medullary rod 1 and a metacarpal fixation structure 2. The spinal cord 1 includes a rotating ball part 11 and a palm fixing rod 12, wherein the rotating ball part 11 is connected to the lower end of the palm fixing rod 12; The metacarpal fixation structure 2 includes a metacarpal fixation plate 21 and a plurality of bone screws. The metacarpal fixation plate 21 has a through hole 211 in the middle. The metacarpal fixation plate 21 is sleeved on the palm fixation rod 12 through the through hole 211. The metacarpal fixation plate 21 and the palm fixation rod 12 are intersecting and connected. The metacarpal fixation plate 21 is located at one end of the palm fixation rod 12 adjacent to the rotating ball part 11. The metacarpal fixation plate 21 has a plurality of bone screw holes 212. The bone screws are adapted to pass through the bone screw holes 212 and connect to the bottom end of the metacarpal bone.

[0022] The combination of the metacarpal fixation plate 21 and multiple bone screws provides stronger fixation. The through holes 211 and bone screw holes 212 on the metacarpal fixation plate 21 allow the bone screws to connect precisely to the base of the metacarpal bones, forming a secure connection. Particularly in the relative position of the rotating ball joint 11, the junction between the fixation plate and the palm fixation rod 12 further enhances the stability of the prosthesis, improves the overall structural stability of the prosthesis, and ensures the safety and effectiveness of the wrist joint during movement.

[0023] Furthermore, the palm fixing rod 12 is frustum-shaped, the lower end diameter of the palm fixing rod 12 is larger than the upper end diameter of the palm fixing rod 12, and the diameter of the rotating ball part 11 is larger than the lower end diameter of the palm fixing rod 12.

[0024] The rotating ball part 11 is adapted to be set at the wrist joint position to replace the damaged wrist joint, and the palm fixing structure can fix the palm bones to realize the wrist joint rotation function.

[0025] Among them, the biological dual-motion total wrist joint prosthesis achieves effective replacement of the wrist joint through the setting of the medullary rod 1 and the metacarpal fixation structure 2. In particular, the configuration of the palm fixation rod 12 and the rotation ball 11 allows the prosthesis to function at the wrist joint position, replacing the damaged original joint, thereby ensuring the wrist's rotational function. This structure not only effectively fixes the metacarpal bones but also improves the prosthesis's rotation angle and range of motion, avoiding the drawback of traditional prostheses that cannot meet the patient's flexible movement needs due to insufficient mobility. The flexion, extension, and displacement movements of the wrist can be completed smoothly, significantly improving the prosthesis's performance.

[0026] Furthermore, the palm fixing rod 12 has a central diameter of 3mm, a length of 10-15mm, and a protective coating on its outer surface.

[0027] Furthermore, the metacarpal fixation structure 2 includes a plurality of first interlocking screws, and the palm fixation rod 12 is provided with a plurality of fixing holes for installing the first interlocking screws. The first interlocking screws are connected to the fixing holes to fix the metacarpal bone on the palm fixation rod 12.

[0028] By providing multiple fixing holes on the palm fixation rod 12 for installing the first interlocking screws, and using the first interlocking screws to fix the metacarpal bones to the palm fixation rod 12, this invention increases the stability and robustness of the biological dual-motion total wrist joint prosthesis. This structural design allows the metacarpal bones to be securely connected to the prosthesis, avoiding loosening or dislodgement of the prosthesis due to improper fixation, thereby ensuring the reliability of the prosthesis during use and its long-term durability.

[0029] Furthermore, the lower end of the palm fixing rod 12 is provided with a threaded hole, and the metacarpal fixation plate 21 is fixed on the palm fixing rod 12 by fasteners connected to the threaded hole.

[0030] The design incorporates a threaded hole at the lower end of the hand fixation rod 12, into which the metacarpal fixation plate 21 is secured with fasteners. This provides a convenient and robust connection method. The design effectively simplifies the prosthesis assembly process while enhancing the connection strength between the fixation plate and the hand fixation rod 12, further improving the overall stability and reliability of the prosthesis and ensuring a more natural and safer movement experience for the patient.

[0031] Furthermore, the biological dual-motion full wrist joint prosthesis also includes an inner liner structure 3, which is spindle-shaped. The top surface of the inner liner structure 3 is provided with a rotating spherical groove 31, and the rotating ball part 11 is rotatably engaged in the rotating spherical groove 31. The bottom and side surfaces of the inner liner structure 3 are arc-shaped.

[0032] The lateral movement angle of the medullary rod 1 relative to the inner lining structure 3 is at least 45°~60°.

[0033] The inner liner structure 3 is spindle-shaped and has a rotating spherical groove 31, which allows the rotating ball part 11 to rotate smoothly within the rotating spherical groove 31, increasing the range of motion of the prosthesis. Through this design, the lateral angle of movement between the stent 1 and the inner liner structure 3 reaches 45° to 60°, thereby ensuring that the prosthesis can simulate the natural movement of the wrist joint, which not only improves the freedom of movement of the prosthesis, but also enhances the flexibility and comfort of the wrist.

[0034] Furthermore, the biological dual-motion full wrist joint prosthesis also includes a radial lateral cup 4, the top of which is provided with an arc-shaped groove 41, which is adapted to the bottom and side surfaces of the inner lining structure 3, and the inner lining structure 3 can rotate within the arc-shaped groove 41.

[0035] The introduction of the radial lateral cup 4 and its matching arcuate groove 41 enhances the flexibility and adaptability of the biological dual-motion total wrist joint prosthesis. The liner structure 3 can rotate within the arcuate groove 41, allowing the prosthesis to more accurately simulate the natural movement trajectory of the wrist joint, thereby further improving the range of motion and rotation angle. This design significantly enhances the dynamic response of the prosthesis, enabling patients to experience a more natural and comfortable movement.

[0036] Furthermore, the biological dual-motion full wrist joint prosthesis also includes a filling block structure 5, which is connected to the bottom of the radial lateral cup 4. The top of the filling block structure 5 is provided with a groove 51, and the bottom of the radial lateral cup 4 is provided with a protrusion 42, which is engaged in the groove 51.

[0037] The design of the slot 51 and protrusion 42 allows the filling block structure 5 to be firmly connected to the radial lateral cup 4, increasing the overall structural strength of the prosthesis. This innovative design not only enhances the stability of the prosthesis during dynamic activities but also improves its durability and reduces the risk of damage due to long-term use.

[0038] Furthermore, the biological dual-motion full wrist joint prosthesis also includes a radial intramedullary rod 6, a limiting hole 52 is provided in the middle of the filling block structure 5, a blind hole is provided at the bottom of the radial lateral cup 4 corresponding to the limiting hole 52, and the top end of the radial intramedullary rod 6 passes through the limiting hole 52 and connects to the blind hole.

[0039] The radial intramedullary rod 6 has an external thread at its tip. Through the cooperation of the limiting hole 52 and the blind hole, the tip of the radial intramedullary rod 6 can be accurately connected to the radial lateral cup 4 via the external thread, ensuring the structural integrity and stability of the prosthesis. This design can effectively prevent the prosthesis from loosening during activities, ensuring that the prosthesis can maintain a stable state and provide safe and reliable support when the patient performs various activities.

[0040] Furthermore, the intramedullary rod 6 of the radius includes a square rod structure 61 and a second locking screw. The square rod structure 61 is provided with a locking hole 62. After the second locking screw is engaged with the steel plate located on the outer side of the radius, it locks with the square rod structure 61 through the locking hole 62.

[0041] The length of the radial intramedullary rod 6 ranges from 30 to 60 mm. The interlocking design of the interlocking holes 62 and the square rod structure 61 ensures a secure fixation between the radial intramedullary rod 6 and the lateral radial plate, preventing loosening or displacement of the prosthesis during movement. This design increases the stability and durability of the prosthesis, allowing it to maintain high stability and reliability even during long-term use.

[0042] In other embodiments, such as Figure 5 As shown, the radial intramedullary rod 6 includes a variable diameter rod body 63 and a threaded core rod 64. The bottom outer side of the variable diameter rod body 63 is provided with a plurality of clearance grooves 65. The interior of the variable diameter rod body 63 is provided with internal threads. The threaded core rod 64 is disposed in the variable diameter rod body 63 through the internal threads. The threaded core rod 64 can move within the variable diameter rod body 63 to adjust the outer diameter of the variable diameter rod body 63.

[0043] The radial intramedullary rod 6 features a variable-diameter rod body 63 and a threaded core rod 64. Rotating the threaded core rod 64 adjusts its position within the variable-diameter rod body 63, controlling the outer diameter after the variable-diameter rod body 63 is opened. This allows the prosthesis to adjust its outer diameter as needed to adapt to different patients' anatomy. This adjustable structure provides greater flexibility in fitting, ensuring better connection between the prosthesis and the patient's radius. The multiple grooves in the variable-diameter rod body 63 not only improve adjustment precision but also enhance the prosthesis's fixation strength, ensuring stability during wrist movements.

[0044] The foregoing has provided a detailed description of a biological dual-motion total wrist joint prosthesis provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only intended to aid in understanding the method and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A biological dual-motion total wrist joint prosthesis, characterized in that, The biological dual-motion total wrist joint prosthesis includes a medullary rod and a metacarpal fixation structure; The spinal cord includes a rotating ball and a palm-fixing rod, wherein the rotating ball is connected to the lower end of the palm-fixing rod; The metacarpal fixation structure includes a metacarpal fixation plate and multiple bone screws. The metacarpal fixation plate has a through hole in the middle. The metacarpal fixation plate is sleeved on the palm fixation rod through the through hole. The metacarpal fixation plate and the palm fixation rod are intersected and connected. The metacarpal fixation plate is located at one end of the palm fixation rod adjacent to the rotating ball part. The metacarpal fixation plate has multiple bone screw holes. The bone screws are adapted to pass through the bone screw holes and connect to the bottom end of the metacarpal bone.

2. The biological dual-motion total wrist joint prosthesis according to claim 1, characterized in that, The palm fixing rod is frustum-shaped, the lower end diameter of the palm fixing rod is larger than the upper end diameter of the palm fixing rod, and the diameter of the rotating ball part is larger than the lower end diameter of the palm fixing rod.

3. The biological dual-motion total wrist joint prosthesis according to claim 1, characterized in that, The length of the palm fixing rod is 10-15mm; the outer surface of the palm fixing rod is provided with a protective coating.

4. The biological dual-motion total wrist joint prosthesis according to claim 1, characterized in that, The lower end of the palm fixation rod is provided with a threaded hole, and the metacarpal fixation plate is fixed to the palm fixation rod by fasteners connected to the threaded hole.

5. The biological dual-motion total wrist joint prosthesis according to claim 1, characterized in that, The biological dual-motion full wrist joint prosthesis also includes an inner liner structure, which is spindle-shaped. The top surface of the inner liner structure has a rotating spherical groove in the middle, and the rotating ball can be rotatably engaged in the rotating spherical groove. The bottom and sides of the inner liner structure are arc-shaped.

6. The biological dual-motion total wrist joint prosthesis according to claim 5, characterized in that, The biological dual-motion full wrist joint prosthesis also includes a radial lateral cup, the top of which has an arc-shaped groove that is adapted to the bottom and side surfaces of the inner lining structure, and the inner lining structure can rotate within the arc-shaped groove.

7. The biological dual-motion total wrist joint prosthesis according to claim 6, characterized in that, The biological dual-motion full wrist joint prosthesis also includes a filler block structure, which is connected to the bottom of the radial lateral cup. The top of the filler block structure is provided with a groove, and the bottom of the radial lateral cup is provided with a protrusion, which is engaged in the groove.

8. The biological dual-motion total wrist joint prosthesis according to claim 7, characterized in that, The biological dual-motion full wrist joint prosthesis also includes a radial intramedullary rod. The middle part of the filling block structure is provided with a limiting hole, and the bottom of the radial lateral cup is provided with a blind hole corresponding to the limiting hole. The top end of the radial intramedullary rod passes through the limiting hole and connects to the blind hole.

9. The biological dual-motion total wrist joint prosthesis according to claim 8, characterized in that, The radial intramedullary rod includes a square rod structure and a second interlocking screw. The square rod structure has interlocking holes. After the second interlocking screw is engaged with the steel plate located on the lateral side of the radius, it interlocks with the square rod structure through the interlocking holes.

10. The biological dual-motion total wrist joint prosthesis according to claim 8, characterized in that, The radial intramedullary rod includes a variable diameter rod body and a threaded core rod. The bottom outer side of the variable diameter rod body is provided with multiple clearance grooves, and the interior of the variable diameter rod body is provided with internal threads. The threaded core rod is disposed in the variable diameter rod body through the internal threads, and the threaded core rod can move within the variable diameter rod body to adjust the outer diameter of the variable diameter rod body.

Images