Wrist joint prosthesis

Abstract

The utility model relates to the technical field of prostheses, and particularly discloses a wrist joint prosthesis. The prosthesis comprises a base and a carpal bone assembly. The base is provided with a wrist joint handle and a ball seat fixedly connected to one end of the wrist joint handle, the wrist joint handle is provided with first through holes and a plurality of second through holes in a penetrating mode, the first through holes and the second through holes are the same in number, all the first through holes are distributed at intervals in the length direction of the wrist joint handle, and each first through hole is communicated with one second through hole in a crossed mode; the carpal bone assembly comprises an assembly body and at least one movable nail, a finger joint handle is fixedly arranged at one end of the assembly body, the movable nails are movably connected to one end of the assembly body, the other end of the assembly body is provided with a ball head portion, the ball head portion is in running fit with the ball seat, and third through holes and a plurality of fourth through holes are formed in the finger joint handle. All the third through holes are distributed at intervals in the length direction of the knuckle handle, and each third through hole is communicated with one fourth through hole in a crossed mode. According to the prosthesis, by optimizing the specific structure, the stability of the motion range of the wrist joint is guaranteed, and the use experience of a patient is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of prostheses, in particular to a wrist joint prosthesis. Background Art

[0002] The wrist joint, also known as the radiocarpal joint, is a typical ellipsoidal joint, which is composed of the proximal articular surfaces of the scaphoid, lunate and triquetral bones of the hand as the joint head, and the articular surface of the radius and the articular disc under the head of the ulna as the joint socket. The joint capsule is loose, and the front, rear and both sides of the joint are strengthened by ligaments, among which the palmar ligament is the toughest, so the extension movement of the wrist is limited.

[0003] The radiocarpal joint can perform flexion, extension, abduction, adduction and circumduction movements. The wrist joint is the most complex joint in the human body, and many diseases or traumas can cause chronic pain and loss of function of the wrist joint, such as rheumatoid arthritis, traumatic arthritis, osteoarthritis, septic arthritis, tumors of the wrist joint, etc.

[0004] At present, degenerative wrist arthritis, rheumatoid arthritis and trauma will all cause serious damage to the wrist joint, resulting in severe pain and loss of function of the wrist joint. In order to enable patients to retain the movement function of their wrist joints while relieving pain, wrist joint prostheses are usually implanted into the human body, and wrist joint replacement surgery is used to restore most of the functions of the wrist joint and solve the pain and deformity problems of patients. Wrist joint replacement surgery is a surgery used to treat end-stage diseases of the wrist joint, such as rheumatism, rheumatoid arthritis, traumatic arthritis, osteoarthritis, etc. This surgery replaces the function of the wrist joint by removing the diseased part of the wrist joint and implanting a prosthesis, aiming to improve the pain symptoms and deformity of patients and improve the quality of life. Although wrist joint replacement surgery can bring pain relief and functional improvement to patients, it is not as popular as hip and knee replacements. Research shows that due to the loosening of the prosthesis components, the failure rate of total wrist joint replacement surgery is close to 50% within five to ten years, which is far from the success rate of total joint replacement surgery for the knee or hip joint.

[0005] In the prior art, the materials and structures of the components on the wrist joint prosthesis are complex, and there is no restriction on the rotation interface of each component, which results in weak stability of the range of motion of the wrist joint and poor structural stability of the wrist joint prosthesis, making it difficult to guarantee the user experience of patients. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a wrist joint prosthesis to optimize the specific structure of the wrist joint prosthesis, ensure the stability of the range of motion of the wrist joint, and improve the user experience of patients.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] Wrist joint prosthesis, comprising a base and a carpal bone component; the base has a wrist joint stem and a ball socket fixed to one end of the wrist joint stem, the wrist joint stem is penetrated with a plurality of first through holes and a plurality of second through holes, all of the first through holes are arranged at intervals along the length direction of the wrist joint stem, the number of the first through holes is the same as that of the second through holes, and each of the first through holes is cross-connected with one of the second through holes; the carpal bone component includes a component main body and at least one movable nail, one end of the component main body is fixedly provided with a finger joint stem, the movable nail is movably connected to one end of the component main body, the other end of the component main body has a ball head, the ball head is rotatably matched with the ball socket, the finger joint stem is penetrated with a plurality of third through holes and a plurality of fourth through holes, all of the third through holes are arranged at intervals along the length direction of the finger joint stem, the number of the third through holes is the same as that of the fourth through holes, and each of the third through holes is cross-connected with one of the fourth through holes.

[0009] As an alternative technical solution of the wrist joint prosthesis, the movable nail has a screw rod and a screw head fixed to one end of the screw rod; a receiving cavity is provided in the component main body, the number of the receiving cavities is the same as that of the movable nails, each of the receiving cavities is communicated with the outside through an installation hole; each of the screw heads is movably installed in one of the receiving cavities, and each of the screw rods passes through one of the installation holes.

[0010] As an alternative technical solution of the wrist joint prosthesis, there are two receiving cavities, and the two receiving cavities are symmetrically arranged about the length direction of the finger joint stem.

[0011] As an alternative technical solution of the wrist joint prosthesis, the component main body includes a ball head and a finger side stem, the ball head is provided at one end of the ball head, a mounting groove is recessed at the other end of the ball head, and a tapered blind hole is recessed at the bottom of the mounting groove; the finger side stem includes a tapered head and a main body plate, the tapered head is fixed to the lower plate surface of the main body plate, the finger joint stem is fixed to the upper plate surface of the main body plate, the tapered head is matched and inserted into the tapered blind hole, and the main body plate is installed in the mounting groove.

[0012] As an alternative technical solution of the wrist joint prosthesis, a receiving groove is recessed on the lower plate surface of the main body plate, the receiving cavity is formed by the bottom of the receiving groove and the bottom of the mounting groove, and the installation hole communicates the bottom of the receiving groove and the upper plate surface of the main body plate.

[0013] As an alternative technical solution of the wrist joint prosthesis, along the direction from the lower plate surface of the main body plate to the upper plate surface of the main body plate, the installation hole extends in a direction away from the finger joint stem.

[0014] As an alternative technical solution of the wrist joint prosthesis, a baffle is fixedly connected to the side surface of the main body plate, an avoidance groove is communicated with the groove wall of the mounting groove, and the baffle passes through the avoidance groove.

[0015] As an alternative technical solution of the wrist joint prosthesis, the length direction of the first through hole is arranged at an angle with the cross section of the wrist joint stem, and the length direction of the second through hole is arranged at an angle with the cross section of the wrist joint stem. In the cross section of the wrist joint stem, the projection of the first through hole is perpendicular to the projection of the second through hole; and / or the length direction of the third through hole is arranged at an angle with the cross section of the finger joint stem, and the length direction of the fourth through hole is arranged at an angle with the cross section of the finger joint stem. In the cross section of the finger joint stem, the projection of the third through hole is perpendicular to the projection of the fourth through hole.

[0016] As an alternative technical solution of the wrist joint prosthesis, opposite first and second planes are provided on the side wall of the wrist joint stem. Two ends of the first through hole communicate with the first plane and the second plane respectively. The length direction of the wrist joint stem is parallel to the first plane, and the length direction of the second through hole is arranged at an angle with the first plane.

[0017] As an alternative technical solution of the wrist joint prosthesis, the wrist joint stem gradually narrows in the direction away from the ball socket, and / or the finger joint stem gradually narrows in the direction away from the ball head.

[0018] Advantages of the present utility model:

[0019] This wrist joint prosthesis adopts the method of penetrating the first through hole and the second through hole on the wrist joint stem and the third through hole and the fourth through hole on the finger joint stem, which facilitates the embedding of the porous tantalum rod. The cross-connected through holes form a bone ingrowth induction area, which is beneficial to the ingrowth of the bones in contact with the wrist joint prosthesis in the patient's body, and realizes the long-term stable fixation of the wrist joint prosthesis. Moreover, the embedding setting of the porous tantalum rod installed in the through hole can make the porous tantalum rod accurately in place under the irradiation of X-rays to realize the positioning and marking of the wrist joint stem and the finger joint stem. Through the design of the movable nail movably connected to the component main body and the finger joint stem fixedly connected to the component main body, it provides convenience for the connection of the wrist joint prosthesis to the patient's finger bone, thereby reducing the implantation difficulty of the wrist joint prosthesis. Combined with the rotational cooperation of the ball head and the ball socket, the movement flexibility of the wrist joint prosthesis is improved, and the stable operation of the wrist joint prosthesis is ensured. Through the above optimization and improvement of the specific structure, this wrist joint prosthesis improves the wear resistance of the wrist joint prosthesis, reduces the risk of wear between components, ensures the stability of the range of motion of the wrist joint, and improves the patient's use experience. Description of the Drawings

[0020] Figure 1 is a schematic structural view of the wrist joint prosthesis provided by an embodiment of the present utility model;

[0021] Figure 2It is an exploded view of the wrist joint prosthesis provided by the embodiment of the present utility model;

[0022] Figure 3 It is a side view of the wrist joint prosthesis provided by the embodiment of the present utility model;

[0023] Figure 4 It is Figure 3 the cross-sectional view of plane A-A in

[0024] Figure 5 It is the front view of the base provided by the embodiment of the present utility model;

[0025] Figure 6 It is the side view of the base provided by the embodiment of the present utility model;

[0026] Figure 7 It is the bottom view of the base provided by the embodiment of the present utility model;

[0027] Figure 8 It is the structural schematic diagram of the ball head provided by the embodiment of the present utility model;

[0028] Figure 9 It is the cross-sectional view of the ball head provided by the embodiment of the present utility model;

[0029] Figure 10 It is the structural schematic diagram of the finger side handle provided by the embodiment of the present utility model;

[0030] Figure 11 It is the front view of the finger side handle provided by the embodiment of the present utility model;

[0031] Figure 12 It is the side view of the finger side handle provided by the embodiment of the present utility model;

[0032] Figure 13 It is the structural schematic diagram of the movable pin provided by the embodiment of the present utility model.

[0033] In the figure:

[0034] 100, base; 110, wrist joint handle; 111, first through hole; 112, second through hole; 113, first plane; 114, second plane; 120, ball socket;

[0035] 200, ball head; 201, installation groove; 202, tapered blind hole; 203, clearance groove;

[0036] 300, finger side handle; 310, tapered head; 320, main body plate; 321, installation hole; 330, finger joint handle; 331, third through hole; 332, fourth through hole; 340, baffle;

[0037] 400, movable pin; 410, screw head; 411, spherical surface; 420, screw rod. Detailed implementation manners

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0039] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0040] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0041] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0042] As Figures 1 to 13As shown in the figure, this embodiment provides a wrist joint prosthesis, which includes a base 100 and a carpal bone component; the base 100 has a wrist joint stem 110 and a ball socket 120 fixedly connected to one end of the wrist joint stem 110. The wrist joint stem 110 is penetrated with a plurality of first through holes 111 and a plurality of second through holes 112. All the first through holes 111 are arranged at intervals along the length direction of the wrist joint stem 110. The number of the first through holes 111 is the same as that of the second through holes 112, and each first through hole 111 is cross-connected with a second through hole 112; the carpal bone component includes a component main body and at least one movable nail 400. One end of the component main body is fixedly provided with a finger joint stem 330. The movable nail 400 is movably connected to one end of the component main body. The other end of the component main body has a ball head, and the ball head is rotatably matched with the ball socket 120. The finger joint stem 330 is penetrated with a plurality of third through holes 331 and a plurality of fourth through holes 332. All the third through holes 331 are arranged at intervals along the length direction of the finger joint stem 330. The number of the third through holes 331 is the same as that of the fourth through holes 332, and each third through hole 331 is cross-connected with a fourth through hole 332.

[0043] This wrist joint prosthesis adopts the method of penetrating the first through holes 111 and the second through holes 112 on the wrist joint stem 110 and the third through holes 331 and the fourth through holes 332 on the finger joint stem 330, which facilitates the embedding of the porous tantalum rods. The cross-connected through holes form a bone ingrowth induction area, which is beneficial to the ingrowth of the bones in the patient's body in contact with the wrist joint prosthesis, so as to realize the long-term stable fixation of the wrist joint prosthesis. Moreover, the embedding setting of the porous tantalum rods installed in the through holes can make the porous tantalum rods accurately in place under the irradiation of X-rays, so as to realize the positioning marking of the wrist joint stem 110 and the finger joint stem 330. Through the design of setting the movable nail 400 movably connected to the component main body and the finger joint stem 330 fixedly connected to the component main body, it provides convenience for the connection of the wrist joint prosthesis to the patient's finger bones, thereby reducing the implantation difficulty of the wrist joint prosthesis. Combined with the rotational cooperation of the ball head and the ball socket 120, the movement flexibility of the wrist joint prosthesis is improved, and the stable operation of the wrist joint prosthesis is ensured. Through the above optimization and improvement of the specific structure, this wrist joint prosthesis improves the wear resistance of the wrist joint prosthesis, reduces the risk of wear between components, ensures the stability of the range of motion of the wrist joint, and improves the patient's use experience.

[0044] In this embodiment, the diameters of the first through holes 111, the second through holes 112, the third through holes 331 and the fourth through holes 332 are 1 mm to 3 mm.

[0045] Specifically, the included angle between the longitudinal direction of the wrist joint stem 110 and the socket 120 is 10°; when the carpal bone assembly rotates relative to the base 100 until the finger joint stem 330 is parallel to the wrist joint stem 110, there is an offset between the finger joint stem 330 and the wrist joint stem 110. The above limitations achieve the position optimization of the finger joint stem 330 and the wrist joint stem 110, which helps to realize the humanized design of the wrist joint prosthesis, reduce the manufacturing cost, reduce the occupied space, and improve the patient's use experience.

[0046] In one implementation manner of this embodiment, the wrist joint stem 110 gradually narrows in the direction away from the socket 120, and the finger joint stem 330 gradually narrows in the direction away from the ball head. In another implementation manner of this embodiment, only the wrist joint stem 110 gradually narrows. In yet another implementation manner of this embodiment, only the finger joint stem 330 gradually narrows.

[0047] Through the design of the specific structures of the wrist joint stem 110 and the finger joint stem 330, the force conditions of the wrist joint stem 110 and the finger joint stem 330 are optimized, and at the same time, it is convenient for the implantation of the wrist joint prosthesis at the affected area.

[0048] Specifically, the wrist joint stem 110 is inserted into the humeral medullary cavity, and the end of the wrist joint stem 110 away from the socket 120 is a spherical head; the finger joint stem 330 is inserted into the palmar phalanx, and the end of the finger joint stem 330 away from the ball head is a spherical head. The above design further reduces the implantation difficulty of the wrist joint prosthesis at the affected area and helps to improve the implantation efficiency.

[0049] In this embodiment, the movable nail 400 has a screw rod 420 and a screw head 410 fixedly connected to one end of the screw rod 420; there is a receiving cavity in the component main body, and the number of receiving cavities is the same as that of the movable nails 400. Each receiving cavity communicates with the outside through an installation hole 321; each screw head 410 is movably installed in a receiving cavity, and each screw rod 420 passes through an installation hole 321.

[0050] Through the structural limitations of the movable nail 400 and the receiving cavity, the movable installation of the movable nail 400 on the component main body is realized. Through the movable installation of the screw head 410 in the receiving cavity, the purpose of limiting the movable nail 400 by the component main body is achieved. Combining with the design that the screw rod 420 passes through the installation hole 321, the rotational movement of the movable nail 400 relative to the component main body is realized. The above structure is simple and reliable, has good connection stability and small occupied space, and avoids the risk of the position deviation of the movable nail 400 due to accidents.

[0051] In this embodiment, the side wall of the screw rod 420 has deep threads. The above limitation increases the contact area between the screw rod 420 and the phalanx, reduces the risk of relative position deviation between the screw rod 420 and the phalanx due to accidents, and ensures the smooth implantation of the wrist joint prosthesis in the patient's body.

[0052] Furthermore, there are two accommodating cavities, and the two accommodating cavities are symmetrically arranged with respect to the length direction of the finger joint handle 330. With the above design, the connection of the wrist joint prosthesis to the three phalanges can be realized, thereby ensuring the stable operation of the wrist joint prosthesis. Moreover, the design of arranging the two movable pins 400 on both sides of the finger joint handle 330 can simulate the movement between the three phalanges, which helps to further improve the patient's use experience.

[0053] In this embodiment, the component main body includes a ball head 200 and a finger side handle 300. The ball head portion is provided at one end of the ball head 200. An installation groove 201 is recessed at the other end of the ball head 200, and a tapered blind hole 202 is recessed at the bottom of the installation groove 201. The finger side handle 300 includes a tapered head 310 and a main body plate 320. The tapered head 310 is fixedly connected to the lower plate surface of the main body plate 320, the finger joint handle 330 is fixedly connected to the upper plate surface of the main body plate 320, the tapered head 310 is inserted into the tapered blind hole 202 in a matching manner, and the main body plate 320 is installed in the installation groove 201.

[0054] The design of separating the ball head 200 and the finger side handle 300 helps to reduce the production cost of the component main body and the assembly difficulty of the movable pin 400 on the component main body. Through the design of inserting the tapered head 310 into the tapered blind hole 202 in a matching manner and installing the main body plate 320 in the installation groove 201, the stable installation of the finger side handle 300 on the ball head 200 can be realized, ensuring the structural stability of the component main body.

[0055] Specifically, the surface of the ball head portion is joint-shaped, and the ball socket 120 has an inner concave spherical groove that matches the ball head portion. The specific structure and working principle of the ball head portion and the inner concave spherical groove are well known to those skilled in the art and will not be elaborated here. The rotational cooperation between the ball head portion and the inner concave spherical groove has a wrapping property, making the relative movement between the base 100 and the wrist bone component smoother.

[0056] In this embodiment, the tapered blind hole 202 is a frustum-shaped groove, and the side wall of the tapered blind hole 202 gradually converges at 3°. The above design helps to reduce the insertion difficulty of the tapered head 310 into the tapered blind hole 202 and improve the connection stability between the ball head 200 and the finger side handle 300.

[0057] Furthermore, a receiving groove is recessed on the lower plate surface of the main body plate 320. The receiving groove and the bottom of the installation groove 201 enclose an accommodating cavity, and the installation hole 321 communicates with the bottom of the receiving groove and the upper plate surface of the main body plate 320.

[0058] Through the structural improvement of the main body plate 320, the specific structure of the finger side handle 300 is simplified, ensuring the smooth enclosure of the accommodating cavity, realizing the accurate communication between the installation hole 321 and the accommodating cavity, and ensuring the stable operation of the component main body.

[0059] Specifically, a section of the screw head 410 close to the screw rod 420 has a spherical surface 411, and the accommodating groove is a hemispherical groove. The above limitations enable the groove wall of the accommodating groove to match and fit with the spherical surface 411, ensuring that the relative movement between the screw rod 420 and the phalanx can be smoothly achieved, reducing the difficulty of movement of the movable nail 400, and improving the patient's usage experience.

[0060] Furthermore, along the direction from the lower plate surface of the main body plate 320 to the upper plate surface of the main body plate 320, the mounting hole 321 extends in a direction away from the finger joint handle 330.

[0061] With the above design, it is possible to further simulate the distribution and movement mode of the patient's phalanges by using the finger side handle 300 and the movable nail 400, so that the phalanges connected thereto can smoothly complete the normal hand movements, thereby optimizing the working effect of the wrist joint prosthesis and ensuring the long-term stable operation of the wrist joint prosthesis.

[0062] Specifically, the included angle between the length direction of the mounting hole 321 and the length direction of the finger joint handle 330 is 2° to 6°. After the movable nail 400 is deflected and rotated by 4°, it can rotate within a range of ±5°.

[0063] In this embodiment, a baffle 340 is fixedly connected to the side surface of the main body plate 320, and an avoidance groove 203 is communicated with the groove wall of the mounting groove 201, and the baffle 340 passes through the avoidance groove 203.

[0064] Specifically, when the baffle 340 is implanted, it protrudes towards the palmar side of the patient, and the above limitation is used to improve the working stability of the wrist joint prosthesis.

[0065] In an implementation manner of this embodiment, the length direction of the first through hole 111 is arranged at an included angle with the cross section of the wrist joint handle 110, the length direction of the second through hole 112 is arranged at an included angle with the cross section of the wrist joint handle 110, and in the cross section of the wrist joint handle 110, the projection of the first through hole 111 is perpendicular to the projection of the second through hole 112. And the length direction of the third through hole 331 is arranged at an included angle with the cross section of the finger joint handle 330, the length direction of the fourth through hole 332 is arranged at an included angle with the cross section of the finger joint handle 330, and in the cross section of the finger joint handle 330, the projection of the third through hole 331 is perpendicular to the projection of the fourth through hole 332. In another implementation manner of this embodiment, only the layout manner of the first through hole 111 and the second through hole 112 is restricted. In still another implementation manner of this embodiment, only the layout manner of the third through hole 331 and the fourth through hole 332 is restricted.

[0066] The above limitations optimize the layout of the first through-hole 111, the second through-hole 112, the third through-hole 331, and the fourth through-hole 332, thereby planning the layout positions of the porous tantalum rods on the wrist joint handle 110 and the finger joint handle 330 and the bone ingrowth induction area, improving and ensuring the stability of the range of motion of the wrist joint, and ensuring the smooth operation of the wrist joint prosthesis.

[0067] Further, opposite first plane 113 and second plane 114 are provided on the side wall of the wrist joint handle 110. Two ends of the first through-hole 111 are respectively communicated with the first plane 113 and the second plane 114. The length direction of the wrist joint handle 110 is parallel to the first plane 113, and the length direction of the second through-hole 112 is arranged at an angle with the first plane 113. Specifically, the angle between the length direction of the second through-hole 112 and the first plane 113 is 10°.

[0068] By setting the first plane 113 and the second plane 114, it helps to improve the stress condition of the wrist joint prosthesis, realize the lightweight design of the wrist joint handle 110, reduce the production cost of the wrist joint handle 110, and at the same time facilitate determining the relative position relationship between the wrist joint prosthesis and the patient's bone during implantation. Thereby, the accuracy of the wrist joint prosthesis implantation can be further improved, and the patient's use experience can be enhanced.

[0069] In this embodiment, the material of the movable nail 400 is titanium alloy; the material of the ball head 200 is ZTA ceramic, and the ball head 200 is oval; the material of the finger side handle 300 is titanium alloy, cobalt-chromium alloy or titanium-tantalum alloy; the material of the base 100 is ceramic or high molecular weight polyethylene.

[0070] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Wrist joint prosthesis, characterized in that, Comprising: A base (100) having a wrist joint handle (110) and a ball socket (120) fixed to one end of the wrist joint handle (110). The wrist joint handle (110) is penetrated by a plurality of first through holes (111) and a plurality of second through holes (112). All the first through holes (111) are arranged at intervals along the length direction of the wrist joint handle (110). The number of the first through holes (111) is the same as that of the second through holes (112), and each first through hole (111) intersects and communicates with one second through hole (112). A carpal bone assembly including an assembly main body and at least one movable nail (400). One end of the assembly main body is fixedly provided with a finger joint handle (330). The movable nail (400) is movably connected to one end of the assembly main body. The other end of the assembly main body has a ball head which is rotatably matched with the ball socket (120). The finger joint handle (330) is penetrated by a plurality of third through holes (331) and a plurality of fourth through holes (332). All the third through holes (331) are arranged at intervals along the length direction of the finger joint handle (330). The number of the third through holes (331) is the same as that of the fourth through holes (332), and each third through hole (331) intersects and communicates with one fourth through hole (332).

2. The wrist joint prosthesis according to claim 1, characterized in that, The movable nail (400) has a screw rod (420) and a screw head (410) fixed to one end of the screw rod (420). An accommodation cavity is provided in the assembly main body. The number of the accommodation cavities is the same as that of the movable nails (400). Each accommodation cavity communicates with the outside through an installation hole (321). Each screw head (410) is movably installed in one accommodation cavity, and each screw rod (420) passes through one installation hole (321).

3. The wrist joint prosthesis according to claim 2, characterized in that, There are two accommodation cavities, and the two accommodation cavities are symmetrically arranged about the length direction of the finger joint handle (330).

4. The wrist joint prosthesis according to claim 2, characterized in that, The assembly main body includes a ball head (200) and a finger side handle (300). The ball head is arranged at one end of the ball head (200). An installation groove (201) is recessed at the other end of the ball head (200), and a tapered blind hole (202) is recessed at the bottom of the installation groove (201). The finger side handle (300) includes a tapered head (310) and a main body plate (320). The tapered head (310) is fixed to the lower plate surface of the main body plate (320), the finger joint handle (330) is fixed to the upper plate surface of the main body plate (320), the tapered head (310) is matched and inserted into the tapered blind hole (202), and the main body plate (320) is installed in the installation groove (201).

5. The wrist joint prosthesis according to claim 4, characterized in that, A accommodation groove is recessed on the lower plate surface of the main body plate (320). The accommodation groove and the bottom of the installation groove (201) enclose the accommodation cavity. The installation hole (321) communicates the bottom of the accommodation groove and the upper plate surface of the main body plate (320).

6. The wrist joint prosthesis according to claim 5, characterized in that, In the direction from the lower plate surface of the main body plate (320) to the upper plate surface of the main body plate (320), the mounting hole (321) extends in a direction away from the knuckle handle (330).

7. The wrist joint prosthesis according to claim 5, characterized in that, A baffle (340) is fixedly connected to the side surface of the main body plate (320), and a clearance groove (203) communicates with the groove wall of the mounting groove (201), and the baffle (340) passes through the clearance groove (203).

8. The wrist joint prosthesis according to claim 1, characterized in that, The length direction of the first through hole (111) is arranged at an angle with the cross section of the wrist joint handle (110), the length direction of the second through hole (112) is arranged at an angle with the cross section of the wrist joint handle (110), and in the cross section of the wrist joint handle (110), the projection of the first through hole (111) is perpendicular to the projection of the second through hole (112); and / or The length direction of the third through hole (331) is arranged at an angle with the cross section of the knuckle handle (330), the length direction of the fourth through hole (332) is arranged at an angle with the cross section of the knuckle handle (330), and in the cross section of the knuckle handle (330), the projection of the third through hole (331) is perpendicular to the projection of the fourth through hole (332).

9. The wrist joint prosthesis according to claim 8, characterized in that, The side wall of the wrist joint handle (110) is provided with opposite first plane (113) and second plane (114), both ends of the first through hole (111) communicate with the first plane (113) and the second plane (114) respectively, the length direction of the wrist joint handle (110) is parallel to the first plane (113), and the length direction of the second through hole (112) is arranged at an angle with the first plane (113).

10. The wrist joint prosthesis according to any one of claims 1-9, characterized in that, The wrist joint handle (110) gradually narrows in the direction away from the ball seat (120), and / or The knuckle handle (330) gradually narrows in the direction away from the ball head.

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