Wrist prosthesis

Abstract

The application relates to a wrist joint prosthesis and relates to the technical field of artificial joint prostheses. The wrist joint prosthesis comprises: a carpal bone assembly for being fixed with one side of a hand-shaped bone, which comprises a carpal bone pad, a carpal bone support block embedded in one side of the carpal bone pad, a carpal bone printing column and a screw connected to the other side of the carpal bone support block, and a support block adjusting device arranged on the embedded side of the carpal bone support block, one end of the support block adjusting device being located in the carpal bone pad, and the carpal bone pad being provided with a locking piece for locking the adjusted position of the support block adjusting device; and a radius bone assembly for being fixed with a radius bone marrow cavity, which comprises a radius bone support, the radius bone support being arranged on the side of the carpal bone pad away from the carpal bone support block. The wrist joint prosthesis has the advantages of shortening the waiting time for surgery.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of artificial joint prosthesis, and particularly relates to a wrist joint prosthesis and a processing method thereof. BACKGROUND

[0002] The wrist joint prosthesis is a medical device product used to replace the wrist joint dysfunction caused by injury or disease. It restores the normal function of the wrist joint by implanting an artificial wrist joint prosthesis into the wrist of the patient through surgery.

[0003] Most of the existing wrist joint prosthesis cases are customized products. The customized wrist joint prosthesis is an artificial joint replacement device tailored according to the specific anatomical structure, physiological characteristics and living habits of the patient.

[0004] The customized wrist joint prosthesis not only requires a longer waiting period for the patient, but also has a high difficulty coefficient for the customized wrist joint prosthesis surgery, which requires a highly specialized medical team, accurate preoperative planning, advanced manufacturing technology and complex surgical skills. SUMMARY

[0005] We expect to provide a general standard wrist joint prosthesis that can not only be adjusted in position according to the intraoperative situation, but also be diversified in assembly and cooperation, thereby saving the operation time and reducing the difficulty coefficient of the operation.

[0006] The wrist joint prosthesis provided in the present application adopts the following technical solution:

[0007] A wrist joint prosthesis comprises:

[0008] A carpal bone assembly for fixing to one side of a metacarpal bone, comprising a carpal bone pad, a carpal bone support block embedded in one side of the carpal bone pad, a carpal bone printing column and a screw connected to the other side of the carpal bone support block, a support block adjusting device arranged on the embedded side of the carpal bone support block, the other end of the support block adjusting device being located in the carpal bone pad, and a locking member arranged on the carpal bone pad for locking the adjusted position of the support block adjusting device;

[0009] A radius bone assembly for fixing to the radius bone medullary cavity, comprising a radius bone holder arranged on the side of the carpal bone pad away from the carpal bone support block.

[0010] By adopting the technical scheme, the height of the support block adjusting device can be adjusted according to the actual situation of the wrist joint of the patient during the operation, then the support block adjusting device is installed in the carpal bone support block, the total thickness of the carpal bone support block and the carpal bone pad after being embedded together meets the size of the missing part of the wrist joint of the patient, then the position of the support block adjusting device is locked by the locking piece, the carpal bone assembly is installed on the side of the phalanx, and the radius assembly is installed on the side of the radius. The height of the support block adjusting device is adjustable, so that the adaptability of the prosthesis is stronger, the long waiting period of the patient caused by the customized wrist joint prosthesis and the high technical requirement of the customized prosthesis are avoided, the waiting time of the operation is shortened, and the situation that the operation difficulty coefficient is large due to the customized wrist joint prosthesis is reduced.

[0011] Optionally, the support block adjusting device comprises an adjusting cap, a threaded middle section in threaded connection with the adjusting cap, and a column body located at one end of the threaded middle section away from the adjusting cap, the column body being used for being inserted into the carpal bone pad, and a plurality of vertical grooves being arranged on the side wall of the threaded middle section.

[0012] A plug hole is arranged on the carpal bone pad, the locking piece is in threaded connection with the plug hole, a medical spring is arranged on the side of the threaded middle section of the locking piece, a limiting block is connected to the medical spring, and the limiting block is used for being clamped in the vertical groove.

[0013] By adopting the technical scheme, the distance between the adjusting cap and the threaded middle section is adjusted, when the total length of the adjusting cap and the threaded middle section after being in threaded connection reaches a predetermined length, the adjusting cap is embedded and fixed in the carpal bone support block, the carpal bone support block is embedded and fixed in the carpal bone pad, and the column body is inserted into the carpal bone pad. The locking piece is screwed into the plug hole, the medical spring connected with the locking piece drives the limiting block to gradually approach the vertical groove, the limiting block is clamped into the vertical groove, the position of the threaded middle section is limited, the total length of the threaded middle section and the adjusting cap is prevented from changing due to rotation of the threaded middle section and the adjusting cap, and the purpose of locking the position of the support block adjusting device is achieved.

[0014] Optionally, the locking piece comprises a thick section screw rod and a thin section positioning rod connected to the thick section screw rod, part of the medical spring is sleeved on the thin section positioning rod, the limiting block is fixed at one end of the medical spring away from the thick section screw rod, and the thick section screw rod is in threaded connection with the plug hole.

[0015] By adopting the technical scheme, the thick section screw rod in threaded connection with the plug hole is screwed into the plug hole from the side of the carpal bone pad, the thin section positioning rod rotates together with the thick section screw rod, the medical spring does not rotate with the rotation of the thin section positioning rod, the limiting block gradually approaches the vertical groove and is clamped into the vertical groove, and the position of the threaded middle section is limited so that the threaded middle section does not rotate relative to the adjusting cap.

[0016] Optionally, a plurality of annular grooves are arranged on the side wall of the adjusting cap in a spaced manner.

[0017] By adopting the technical scheme, whether the total length of the adjustment cap and the threaded connection of the middle section of the thread reaches the expected height value after the threaded connection can be observed from the annular groove.

[0018] Optionally, a radius extension section is connected to the side of the radius holder away from the carpal pad, and an end of the radius extension section away from the radius holder is eccentric and connected with a radius extension handle, and the radius extension handle is used to fix the radius medullary cavity.

[0019] By adopting the technical scheme, when the position of the radius of the patient is not standard and deviates from the carpal bone, the eccentric radius extension section in the embodiment can be used.

[0020] Optionally, the radius extension handle comprises an outer tapered part for inserting the radius extension section, a printing extension ring, and a columnar handle for inserting the radius medullary cavity, which are connected in sequence.

[0021] By adopting the technical scheme, the printing extension ring is used to prevent the prosthesis from sinking, and the columnar handle is used to insert the radius medullary cavity to fix the wrist joint prosthesis and the radius.

[0022] Optionally, a plurality of triangular needles are arranged on one end of the columnar handle connected with the printing extension ring, and a plurality of tuning forks are arranged on the other end, and the outer side surface of each tuning fork forms an annular groove.

[0023] By adopting the technical scheme, the plurality of triangular needles are uniformly arranged on the outer side wall of the columnar handle, so that the prosthesis is better embedded in the bone and better combined with the medullary cavity; when the tuning forks are inserted into the radius medullary cavity, they can be contracted towards the axial center side, which can be better implanted, and the outer side surface of each tuning fork forms an annular groove, which is a natural arc to provide a better matching degree and prevent postoperative wrist joint pain.

[0024] Optionally, a radius handle taper is connected to the side of the radius holder away from the carpal pad, an end of the radius handle taper away from the radius holder is connected with a printing handle proximal end, the printing handle proximal end is connected with a printing handle distal end away from the radius handle taper, and the distance between the printing handle proximal end and the printing handle distal end is adjustable.

[0025] By adopting the technical scheme, the positions of the printing handle proximal end and the printing handle distal end are adjustable, so that the radius assembly can be adjusted in length according to the position of the radius medullary cavity, and then better implanted in the radius medullary cavity.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. The radial component is eccentric or standard to adapt to the wrist conditions of different patients, thereby providing a variety of assembly fits, making the wrist prosthesis a universal standardized prosthesis, saving surgical time, and suitable for patients undergoing first surgery or local tumors;

[0028] 2. According to the actual condition of the patient's wrist joint during the operation, the height of the support block adjustment device can be adjusted first to match the size of the missing part of the patient's wrist joint, thereby shortening the waiting time for surgery and reducing the difficulty of surgery caused by the need for customized wrist joint prosthesis, thus avoiding the situation where customized wrist joint prosthesis causes patients to wait for a period of time. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of the overall structure of the wrist joint prosthesis of Example 1;

[0030] Figure 2 1. It is a structural diagram of the support block adjustment device;

[0031] Figure 3 It is a structural diagram of the limiting block limiting the support block adjustment device;

[0032] Figure 4 This is a schematic diagram of the structure of the carpal bone printing column;

[0033] Figure 5 is a schematic structural diagram of the radial extension segment in Example 1;

[0034] Figure 6 This is a schematic structural diagram of the radial extension handle in Example 1;

[0035] Figure 7 is a schematic diagram of the overall structure of the wrist joint prosthesis of Example 2;

[0036] Figure 8 Schematic diagram of the overall structure of the wrist joint prosthesis of Example 3.

[0037] Description of reference numerals:

[0038] 11. Carpal support block; 12. Carpal pad; 121. Socket; 13. Carpal printing column; 131. Printing thorn; 132. Top needle; 14. Screw; 15. Medical spring; 16. Limiting block;

[0039] 20. Support block adjustment device; 21. Adjustment cap; 211. Annular groove; 22. Threaded middle section; 23. Column; 24. Vertical groove;

[0040] 31, radius bracket; 32, radius extension section; 33, radius extension handle; 331, outer taper; 332, printing extension ring; 333, columnar handle; 334, triangular needle; 335, tuning fork; 336, annular groove. DETAILED DESCRIPTION

[0041] The application will be further described below in conjunction with the accompanying drawings. Figures 1-8 The application will be further described below in conjunction with the accompanying drawings.

[0042] The application discloses a wrist joint prosthesis.

[0043] Embodiment one:

[0044] Please refer to Figure 1 , Figure 2 and Figure 3 , a wrist joint prosthesis, comprising: a carpal bone assembly for fixing with one side of a metacarpal bone and a radius assembly connected to one side thereof, the radius assembly is used for fixing with the radius medullary cavity.

[0045] The carpal bone assembly comprises a tapered carpal bone pad 12 and a carpal bone support block 11, one side of the carpal bone support block 11 is tapered and embedded in the carpal bone pad 12, the material of the carpal bone support block 11 is titanium metal printing or tantalum metal printing, the body is provided with an outer taper and is taperedly matched in the inner taper of the carpal bone pad 12. In order to reduce the possibility of disengagement between the two, a pin can be inserted into the carpal bone pad 12 to fix the carpal bone pad 12 and the carpal bone support block 11. The material of the carpal bone pad 12 is high crosslinking, VE high crosslinking, ceramic, PEEK, etc.

[0046] The middle part of the side of the carpal bone support block 11 which is not embedded in the carpal bone pad 12 is fixed with a carpal bone printing column 13 for fixing with the metacarpal bone, and screws 14 for fixing on the phalanges are arranged on the carpal bone support block 11 on both sides of the carpal bone printing column 13. The carpal bone support block 11 has two ball sockets on both sides of the middle part, and the screws 14 are fixed on the carpal bone support block 11 through the ball sockets. The side of the carpal bone support block 11 embedded in the carpal bone pad 12 is provided with two support block adjusting devices 20, and the lower surface of the two ball sockets has a stepped hole for placing one support block adjusting device 20 respectively.

[0047] The support block adjusting device 20 comprises an adjusting cap 21, a threaded middle section 22 threadedly connected with the adjusting cap 21 and a column body 23 fixed at one end of the threaded middle section 22 away from the adjusting cap 21, and the column body 23 is used for inserting into the carpal bone pad 12. The carpal bone pad 12 is provided with an inner taper groove, the taper is 2-18°, and the body has inner grooves on both sides of the middle part for fixing the column body 23. A plurality of vertical grooves 24 are arranged on the side wall of the threaded middle section 22, and in the embodiment, the vertical grooves 24 are six, but are not limited to six, and can be more. In order to facilitate the insertion of the column body 23 and the inner groove, the column body 23 is a cylindrical body, and the cross section of the inner groove is circular.

[0048] The adjusting cap 21 is provided with a plurality of annular grooves 211 spaced apart Figure 2 The annular grooves 211 are four in number, but are not limited to four. The distance between the adjusting cap 21 and the threaded middle section 22 is adjusted, and the total length of the adjusting cap 21 and the threaded middle section 22 after being screwed together can be observed from the annular grooves 211. When the total length reaches a predetermined length, the adjusting cap 21 is embedded and fixed in the carpal bone support block 11 and the two do not rotate relative to each other, the carpal bone support block 11 is embedded and fixed in the carpal bone pad 12, and the column 23 is inserted into the carpal bone pad 12.

[0049] The carpal bone pad 12 is provided with a locking member for locking the adjusted position of the support block adjusting device 20. A hole 121 is formed in the carpal bone pad 12 in a direction perpendicular to the axis of the support block adjusting device 20. The locking member is screwed into the hole 121 from the side of the carpal bone pad 12 and is used to fine-tune and lock the adjusted position of the adjusting cap 21 and the threaded middle section 22.

[0050] The locking member includes a thick section screw rod 41 and a thin section positioning rod 42 fixedly connected to the thick section screw rod 41. The hole 121 is provided with an internal thread corresponding to the thick section screw rod 41. A medical spring 15 is sleeved on the thin section positioning rod 42, the length of the medical spring 15 is longer than that of the thin section positioning rod 42, and the end of the medical spring 15 away from the thick section screw rod 41 is fixed with a limiting block 16.

[0051] The thick section screw rod 41 is screwed into the hole 121 from the side of the carpal bone pad 12 and is screwed into the hole 121. The diameter of the thin section positioning rod 42 is smaller than that of the thick section screw rod 41, the thin section positioning rod 42 rotates with the thick section screw rod 41, and the medical spring 15 is not fixedly connected to the thin section positioning rod 42 and does not rotate with the rotation of the thin section positioning rod 42. When the medical spring 15 drives the limiting block 16 to move towards the threaded middle section 22, the limiting block 16 is clamped into the vertical groove 24 on the threaded middle section 22, and the position of the adjusting cap 21 and the threaded middle section 22 is fixed. The number of vertical grooves 24 can be set to be relatively dense to facilitate the clamping of the limiting block 16.

[0052] Of course, the limiting block 16 can also fine-tune the position of the adjusting cap 21 and the threaded middle section 22. The number of vertical grooves 24 can be reduced, and when the limiting block 16 drives the part between the adjacent two vertical grooves 24, the threaded middle section 22 can have a certain micro-rotation relative to the adjusting cap 21, thereby achieving the effect of fine-tuning.

[0053] Please refer to Figure 4 The carpal bone printing column 13 is in the shape of a cylinder and is made of titanium or tantalum. The lower end of the carpal bone printing column 13 is provided with an outer taper which is matched with the carpal bone support block 11. The side wall of the carpal bone printing column 13 is uniformly provided with printing plum blossom thorns 131 which are in the shape of double chevrons. The upper end of the carpal bone printing column 13 is provided with a circular gradient and a top pin 132 which can effectively penetrate into the phalanges.

[0054] Please refer to Figure 1 , Figure 5 and Figure 6 , the radius assembly includes a radius holder 31, which is arranged on the side of the carpal pad 12 away from the carpal support block 11. The radius holder 31 is made of cobalt-chromium-molybdenum, and the upper surface of the body is the joint wear interface, which is in contact and friction with the bottom surface of the carpal pad 12 to achieve 360° angular activity. The side of the radius holder 31 away from the carpal pad 12 is connected to a radius extension segment 32, and the bottom surface of the body is provided with an inner tapered groove for fixing the radius extension segment 32.

[0055] The radius extension segment 32 is eccentric at the end away from the radius holder 31 and is connected to a radius extension handle 33, which is used to fix the radius medullary cavity. When the patient's radius position is not standard and deviates from the carpus, the eccentric radius extension segment 32 in this embodiment can be used.

[0056] The radius extension handle 33 includes an outer tapered part 331 for inserting the radius extension segment 32, a printing extension ring 332, and a columnar handle 333 for inserting the radius medullary cavity, which are connected in sequence. The end of the printing extension ring 332 close to the columnar handle 333 is stepped, which is used to prevent the prosthesis from sinking.

[0057] The side of the columnar handle 333 connected to the printing extension ring 332 is provided with a plurality of triangular needles 334, which are uniformly arranged on the outer side wall of the columnar handle 333, so that the prosthesis is better embedded in the bone and better combined with the medullary cavity. The other side of the columnar handle 333 is provided with a plurality of tuning forks 335, which can be retracted when inserted into the radius medullary cavity, which can be better implanted. The outer side surface of each tuning fork 335 forms an annular groove 336, which is a natural arc to provide a better matching degree to prevent postoperative wrist joint pain.

[0058] Example Two:

[0059] Please refer to Figure 7 , the difference between Example Two and Example One is that the radius assembly is slightly different. In Example Two, the radius assembly includes a radius holder 31, but the side of the radius holder 31 away from the carpal pad 12 is connected to a radius handle taper 34, and the end of the radius handle taper 34 away from the radius holder 31 is connected to a printing handle proximal end 35. The end of the printing handle proximal end 35 away from the radius handle taper 34 is connected to a printing handle distal end 36, and the distance between the printing handle proximal end 35 and the printing handle distal end 36 is adjustable. The radius handle taper 34, the printing handle proximal end 35, and the printing handle distal end 36 are made of titanium metal printing or tantalum metal printing.

[0060] Specifically, the end of the printing handle proximal end 35 opposite to the radius handle taper 34 is solid, and the cross section of the printing handle proximal end 35 can ensure the axial and rotational stability, and the printing handle proximal end 35 is designed with a low-cut outer side, which can be easily inserted into the prosthesis under minimally invasive incision operation.

[0061] The proximal end 35 of the printing stem is columnar in shape and has a guide groove on the side wall thereof, and the distal end 36 of the printing stem is sleeved on the columnar end of the proximal end 35 of the printing stem, and the inner wall of the distal end 36 of the printing stem is provided with a guide strip matched with the guide groove, the guide strip moves along the guide groove, and the positional relationship between the proximal end 35 of the printing stem and the distal end 36 of the printing stem can be adjusted, and the position is adjusted and then fixed by a pin.

[0062] The radius stem cone 34 in the embodiment is not eccentric, and when the position of the radius of the patient is standard and does not deviate from the carpal bone, the radius assembly in the second embodiment can be used. The position of the proximal end 35 of the printing stem and the distal end 36 of the printing stem in the second embodiment is adjustable, so that the radius assembly can be adjusted in length according to the position of the radius medullary cavity, and thus can be better implanted into the radius medullary cavity.

[0063] Embodiment three:

[0064] Please refer to Figure 8 The difference between the third embodiment and the second embodiment lies in that the radius assembly is slightly different. In the third embodiment, the radius assembly comprises the radius holder 31, but the side of the radius holder 31 away from the carpal bone pad 12 is connected with the radius stem cone 34, the end of the radius stem cone 34 away from the radius holder 31 is connected with the hollow printing stem 37, the printing stem 37 is inserted with the printing cone body 38, and the printing cone body 38 and the printing stem 37 are fixed together by the distal end body 39 through threads to form the radius stem.

[0065] Specifically, the distal end body 39 is sleeved on the end of the printing stem 37 away from the radius stem cone 34 and inserted with the printing cone body 38, and is fixed from the axial direction by using a screw.

[0066] The printing stem 37 in the embodiment is hollow and has a certain elasticity, and when implanted into the radius medullary cavity, the printing stem 37 can be deformed to a certain extent towards the printing cone body 38, which not only ensures the corresponding strength of the solid structure of the radius stem, but also facilitates the implantation of the prosthesis and reduces the pain of the patient.

[0067] In addition, several through vertical notches can also be formed on the side wall of the printing stem 37, so that the diameter of the inserted printing cone body 38 can be appropriately reduced, which can ensure that the printing stem 37 has a certain deformation amount towards the central axis, and at the same time, the insertion of the printing cone body 38 into the hollow printing stem 37 ensures that the printing stem 37 is essentially a solid structure and has corresponding solidity, which facilitates the implantation of the prosthesis and reduces the pain of the patient.

[0068] The present application can provide diversified assembly and cooperation, and is a general standardized prosthesis, which can save operation time and is suitable for primary operation or patients with tumor in the part.

[0069] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A wrist joint prosthesis, characterized in that: include: A carpal bone assembly for fixing to one side of a hand bone, comprising a carpal bone pad (12), a carpal bone support block (11) with one side embedded in the carpal bone pad (12), a carpal bone printing column (13) and a screw (14) connected to the other side of the carpal bone support block (11), and a support block adjustment device (20) arranged on the embedded side of the carpal bone support block (11), the other end of the support block adjustment device (20) being located in the carpal bone pad (12), and a locking member for locking the adjusted position of the support block adjustment device (20) being provided on the carpal bone pad (12); A radial component for fixing to the radial medullary cavity, comprising a radial support (31), wherein the radial support (31) is arranged on a side of the carpal pad (12) away from the carpal support block (11); The support block adjustment device (20) comprises an adjustment cap (21), a threaded middle section (22) threadedly connected to the adjustment cap (21), and a column (23) located at one end of the threaded middle section (22) facing away from the adjustment cap (21), wherein the column (23) is used for being plugged into the carpal bone pad (12), and a plurality of vertical grooves (24) are provided on the side wall of the threaded middle section (22); The carpal pad (12) is provided with an insertion hole (121), the locking member is threadedly connected to the insertion hole (121), a medical spring (15) is provided on the side of the locking member facing the middle section (22) of the thread, a limiting block (16) is connected to the medical spring (15), and the limiting block (16) is used to be clamped in the vertical groove (24); The locking member comprises a thick screw segment (41) and a thin positioning rod (42) connected to the thick screw segment (41); a portion of the medical spring (15) is sleeved on the thin positioning rod (42); the limiting block (16) is fixed to an end of the medical spring (15) away from the thick screw segment (41); and the thick screw segment (41) and the jack (121) are threadedly connected.

2. The wrist joint prosthesis according to claim 1, characterized in that: A plurality of annular grooves (211) are spaced apart on the side wall of the regulating cap (21).

3. The wrist joint prosthesis according to claim 1, characterized in that: The radial support (31) is connected to a radial extension section (32) on a side away from the carpal pad (12); the radial extension section (32) is eccentric at one end away from the radial support (31) and is connected to a radial extension handle (33); the radial extension handle (33) is used for fixing to the radial medullary cavity.

4. The wrist joint prosthesis according to claim 3, characterized in that: The radial extension handle (33) comprises an outer cone (331) for inserting into the radial extension segment (32), a printed extension ring (332), and a columnar handle (333) for inserting into the radial medullary cavity, which are connected in sequence.

5. The wrist joint prosthesis according to claim 4, characterized in that: One end of the columnar handle (333) connected to the printing extension ring (332) is provided with a plurality of triangular needles (334), and the other end is provided with a plurality of tuning forks (335), and the outer side surface of each tuning fork (335) forms an annular groove (336).

6. The wrist joint prosthesis according to claim 1, characterized in that: The side of the radial support (31) away from the carpal pad (12) is connected to a radial stem cone (34), the end of the radial stem cone (34) away from the radial support (31) is connected to the proximal end of the printing handle (35), and the end of the proximal end of the printing handle (35) away from the radial stem cone (34) is connected to the distal end of the printing handle (36), and the distance between the proximal end of the printing handle (35) and the distal end of the printing handle (36) is adjustable.

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