Wrist joint prosthesis

Abstract

The invention relates to a wrist joint prosthesis, and relates to the technical field of artificial joint prostheses. A wrist joint prosthesis comprises a carpal bone assembly used for being fixed to one side of a hand-shaped bone, the carpal bone assembly comprises a carpal bone pad, a carpal bone supporting block with one side embedded into the carpal bone pad, a carpal bone printing column and a screw which are connected to the other side of the carpal bone supporting block, and a supporting block adjusting device arranged on the embedded side of the carpal bone supporting block, the other end of the supporting block adjusting device is located in the carpal pad, and the carpal pad is provided with a locking piece used for locking the adjusted position of the supporting block adjusting device. The radius assembly is used for being fixed to the radial marrow cavity and comprises a radius support, and the radius support is arranged on the side, away from the carpal supporting block, of the carpal pad. The wrist joint prosthesis has the advantage that the operation waiting time is shortened.

Description

Technical Field

[0001] The invention belongs to the field of artificial joint prostheses, and in particular relates to a wrist joint prosthesis and a processing method thereof. Background Art

[0002] Wrist prosthesis is a medical device product used to replace wrist dysfunction caused by damage or disease. It is implanted into the patient's wrist through implant surgery to restore the normal function of the wrist joint.

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

[0004] Customized wrist prostheses not only require patients to wait for a long time, but customized wrist prosthesis surgery is also difficult and requires a highly specialized medical team, precise preoperative planning, advanced manufacturing technology and complex surgical skills. Summary of the invention

[0005] We hope to provide a universal standardized wrist prosthesis that can not only be adjusted in position according to intraoperative conditions, but also be assembled and matched in a variety of ways, thereby saving surgical time and reducing the difficulty of surgery.

[0006] The present application provides a wrist joint prosthesis, which adopts the following technical solution: A wrist joint prosthesis, comprising: A carpal bone assembly for fixing to one side of a hand bone, comprising a carpal bone pad, a carpal bone support block embedded in the carpal bone pad on one side, a carpal bone printing column and a screw connected to the other side of the carpal bone support block, and a support block adjustment device arranged on the embedded side of the carpal bone support block, wherein the other end of the support block adjustment device is located in the carpal bone pad, and a locking member for locking the adjusted position of the support block adjustment device is arranged on the carpal bone pad; The radial component used for fixing with the radial medullary cavity comprises a radial support, which is arranged on a side of the carpal pad away from the carpal support block.

[0007] By adopting the above technical solution, during surgery, the height of the support block adjustment device can be adjusted first according to the actual situation of the patient's wrist joint during the operation, and then the support block adjustment device is installed in the carpal support block, so that the total thickness of the carpal support block and the carpal pad after fitting matches the size of the missing part of the patient's wrist joint, and then the support block adjustment device is locked in position by the locking piece, and the carpal component is installed to the phalanx side, and the radial component is installed to the radius side. The adjustable height of the support block adjustment device makes the prosthesis more adaptable, avoiding the long waiting period for patients caused by customized wrist prostheses and the excessively high technical requirements brought by customized prostheses, which not only shortens the waiting time for surgery, but also reduces the high difficulty coefficient of surgery caused by the need for customized wrist prostheses.

[0008] Optionally, the support block adjustment device comprises an adjustment cap, a threaded middle section threadedly connected to the adjustment cap, and a column located at one end of the threaded middle section away from the adjustment cap, the column is used to be plugged into the wrist bone pad, and a plurality of vertical grooves are arranged on the side wall of the threaded middle section; The carpal pad is provided with an insertion hole, the locking piece is threadedly connected in the insertion hole, a medical spring is arranged on the side of the locking piece facing the middle section of the thread, a limiting block is connected to the medical spring, and the limiting block is used to be clamped in the vertical groove.

[0009] By adopting the above technical solution, the distance between the adjusting cap and the middle section of the thread is adjusted. When the total length of the adjusting cap and the middle section of the thread after being threaded together reaches a predetermined length, the adjusting cap is embedded and fixed in the carpal support block, the carpal support block is embedded and fixed in the carpal pad, and the column is inserted into the carpal pad. The locking piece is screwed into the socket, and the medical spring connected to the locking piece drives the limiting block to gradually approach the vertical groove. The limiting block is inserted into the vertical groove to limit the position of the middle section of the thread, so as to avoid the middle section of the thread and the adjusting cap from rotating to cause the total length of the two to change, thereby achieving the purpose of locking the position of the support block adjustment device.

[0010] Optionally, the locking member includes a thick screw section and a thin positioning rod connected to the thick screw section, a portion of the medical spring is sleeved on the thin positioning rod, the limiting block is fixed to one end of the medical spring away from the thick screw section, and the thick screw section is threadedly connected to the socket.

[0011] By adopting the above technical solution, a thick screw rod threadedly connected to the wrist bone pad is screwed into the socket on one side of the wrist bone pad, and the thin positioning rod rotates with the thick screw rod, while the medical spring does not rotate with the rotation of the thin positioning rod; the limiting block gradually approaches the vertical groove and is stuck in the vertical groove, thereby limiting the position of the middle section of the thread so that it will not rotate relative to the adjusting cap.

[0012] Optionally, a plurality of annular grooves are spaced apart on the side wall of the adjusting cap.

[0013] By adopting the above technical solution, it can be observed from the annular groove whether the total length of the adjusting cap and the middle section of the thread after being threadedly connected reaches the expected height value.

[0014] Optionally, the side of the radial support away from the carpal pad is connected to the radial extension section, and the end of the radial extension section away from the radial support is eccentric and connected to a radial extension handle, and the radial extension handle is used for fixing to the radial medullary cavity.

[0015] By adopting the above technical solution, when the patient's radius is not in a standard position and deviates from the wrist bone, the eccentric radius extension section in this embodiment can be used.

[0016] Optionally, the radius extension handle includes an outer cone portion for inserting into the radius extension segment, a printed extension ring, and a columnar handle for inserting into the radial medullary cavity, which are connected in sequence.

[0017] By adopting the above technical solution, the printed extension ring is used to prevent the prosthesis from sinking, and the columnar handle is used to be inserted into the radial medullary cavity to fix the wrist joint prosthesis and the radius.

[0018] Optionally, one end of the columnar handle connected to the printing extension ring is provided with a plurality of triangular needles, and the other end is provided with a plurality of tuning forks, and an annular groove is formed on the outer side of each tuning fork.

[0019] By adopting the above technical solution, multiple triangular needles are evenly arranged on the outer wall of the columnar handle, so that the prosthesis can grow into the bone better and better integrate with the medullary cavity; when the tuning fork is inserted into the radial medullary cavity, it can be retracted toward the axial side, which can be better implanted, and an annular groove is formed on the outer side of each tuning fork, which is a natural curvature to provide a changed matching degree to prevent the occurrence of postoperative wrist pain.

[0020] Optionally, a radial stem cone is connected to a side of the radial support away from the carpal pad, an end of the radial stem cone facing away from the radial support is connected to a proximal end of a printing handle, an end of the proximal end of the printing handle away from the radial stem cone is connected to a distal end of the printing handle, and the distance between the proximal end of the printing handle and the distal end of the printing handle is adjustable.

[0021] By adopting the above technical solution, the positions of the proximal end and the distal end of the printing handle are adjustable, so that the length of the radial component can be adjusted according to the position of the radial medullary cavity, thereby being better implanted in the radial medullary cavity.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: 1. The radial component is eccentric or standard to adapt to the wrist conditions of different patients, thereby providing diversified assembly and matching, making the wrist joint prosthesis a universal standardized prosthesis, saving operation time, and suitable for patients undergoing first surgery or local tumors; 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 the operation and reducing the difficulty of the operation caused by the need for customized wrist prosthesis, thus avoiding the situation where the patient has to wait for a period of time due to customized wrist prosthesis. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the overall structure of the wrist joint prosthesis of Example 1; Figure 2 is a structural schematic diagram of a support block adjustment device; Figure 3 It is a structural schematic diagram of the limiting block limiting the support block adjustment device; Figure 4 It is a schematic diagram of the structure of the carpal bone printing column; Figure 5 is a schematic structural diagram of the radial extension section in Example 1; Figure 6 is a schematic structural diagram of the radial extension handle in Example 1; Figure 7 is a schematic diagram of the overall structure of the wrist joint prosthesis of Example 2; Figure 8 It is a schematic diagram of the overall structure of the wrist joint prosthesis of Example 3.

[0024] Description of reference numerals: 11. Carpal support block; 12. Carpal pad; 121. Socket; 13. Carpal printing column; 131. Printing plum blossom thorn; 132. Top needle; 14. Screw; 15. Medical spring; 16. Limit block; 20. Support block adjustment device; 21. Adjustment cap; 211. Annular groove; 22. Threaded middle section; 23. Column; 24. Vertical groove; 31. Radial support; 32. Radial extension; 33. Radial extension handle; 331. Outer cone; 332. Print extension ring; 333. Columnar handle; 334. Triangular acupuncture; 335. Tuning fork; 336. Annular groove. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1-Figure 8 This application is described in further detail.

[0026] The embodiment of the present application discloses a wrist joint prosthesis.

[0027] Embodiment 1: See also Figure 1 , Figure 2 and Figure 3A wrist joint prosthesis comprises: a carpal bone component for fixing to one side of a hand bone and a radial bone component connected to one side thereof, wherein the radial bone component is used for fixing to the radial medullary cavity.

[0028] The carpal bone component includes a carpal bone pad 12 and a carpal bone support block 11 with a tapered fit. One side of the carpal bone support block 11 is tapered and embedded in the carpal bone pad 12. The carpal bone support block 11 is made of titanium metal printing or tantalum metal printing. The body is provided with an outer cone and the cone fits in the inner cone of the carpal bone pad 12. In order to reduce the possibility of separation 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 cross-linking, VE high cross-linking, ceramic, PEEK, etc.

[0029] A carpal print column 13 for fixing to the hand bones is fixed to the middle of the side of the carpal support block 11 that is not embedded in the carpal pad 12, and screws 14 for fixing to the phalanges are arranged on the carpal support block 11 on both sides of the carpal print column 13. There are two ball sockets on both sides of the middle of the carpal support block 11, and the screws 14 are fixed to the carpal support block 11 through the ball sockets. Two support block adjustment devices 20 are arranged on the side of the carpal support block 11 embedded in the carpal pad 12, and there are stepped holes under the two ball sockets, each for placing a support block adjustment device 20.

[0030] The support block adjustment device 20 includes an adjustment cap 21, a threaded middle section 22 threadedly connected to the adjustment cap 21, and a column 23 fixed to the end of the threaded middle section 22 away from the adjustment cap 21, and the column 23 is used to be plugged into the carpal pad 12. The carpal pad 12 is provided with an inner conical groove with a taper of 2-18°, and inner grooves are provided on both sides of the middle of the body for fixing the column 23. A plurality of vertical grooves 24 are provided on the side wall of the threaded middle section 22. In this embodiment, there are six vertical grooves 24, but it is not limited to six, and there can be more. In order to facilitate the plugging of the column 23 and the inner groove, the column 23 is a cylinder, and the cross section of the inner groove is circular.

[0031] The adjusting cap 21 is provided with a plurality of annular grooves 211 at intervals. Figure 2 The diagram shows a case where there are four annular grooves 211, but the number is not limited to four. The distance between the adjusting cap 21 and the threaded middle section 22 can be adjusted, and the total length of the adjusting cap 21 and the threaded middle section 22 after being threadedly connected can be observed from the annular groove 211. When the predetermined length is reached, the adjusting cap 21 is embedded and fixed in the carpal support block 11 so that the two do not rotate relative to each other, the carpal support block 11 is embedded and fixed in the carpal pad 12, and the column 23 is inserted into the carpal pad 12.

[0032] The carpal pad 12 is provided with a locking piece for locking the adjusted position of the support block adjustment device 20. A socket 121 is provided on the carpal pad 12 perpendicular to the axial direction of the support block adjustment device 20. The locking piece is screwed into the socket 121 on the side of the carpal pad 12 and is used to fine-tune and lock the adjustment cap 21 and the threaded middle section 22 after the adjusted position.

[0033] 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, and the jack 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, and the length of the medical spring 15 is longer than the thin section positioning rod 42. A limiting block 16 is fixed to one end of the medical spring 15 away from the thick section screw rod 41.

[0034] The thick screw rod 41 threadedly connected to the carpal bone pad 12 is screwed into the socket 121 on one side of the carpal bone pad 12. The diameter of the thin positioning rod 42 is smaller than that of the thick screw rod 41. The thin positioning rod 42 rotates with the thick screw rod 41. The medical spring 15 is not fixedly connected to the thin positioning rod 42 and does not rotate with the rotation of the thin positioning rod 42. When the medical spring 15 drives the limiting block 16 to move toward the threaded middle section 22, the limiting block 16 is clamped into the vertical groove 24 on the threaded middle section 22, and the positions of the adjusting cap 21 and the threaded middle section 22 are fixed. The number of vertical grooves 24 can be set relatively densely to facilitate the clamping of the limiting block 16.

[0035] Of course, the limiting block 16 can also fine-tune the position of the adjusting cap 21 and the threaded middle section 22, and the number of vertical slots 24 can be reduced. When the limiting block 16 drives the area between two adjacent vertical slots 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.

[0036] See also Figure 4 The carpal bone printing column 13 is cylindrical and made of titanium metal printing parts or tantalum metal printing parts. The lower end of the carpal bone printing column 13 is provided with an outer cone taper to fit on the carpal bone support block 11. The side wall of the carpal bone printing column 13 is evenly distributed with printed plum blossom thorns 131 in the shape of a double herringbone. The upper end of the body is provided with a circular gradient, and a top needle 132 is provided on it, which can grow into the phalanges more effectively.

[0037] Please also read Figure 1 , Figure 5 and Figure 6 The radial component includes a radial support 31, which is arranged on the side of the carpal pad 12 away from the carpal support block 11. The radial support 31 is made of cobalt-chromium-molybdenum, and the upper surface of the body is a joint wear interface, which contacts and rubs with the bottom surface of the carpal pad 12 to achieve 360° angular activity. The side of the radial support 31 away from the carpal pad 12 is connected to the radial extension section 32, and the bottom surface of the body is provided with an inner conical groove for fixing the radial extension section 32.

[0038] The radial extension section 32 is eccentric at one end away from the radial support 31 and is connected to the radial extension handle 33, which is used to fix the radial medullary cavity. When the patient's radius position is not standard and deviates from the carpal bone, the eccentric radial extension section 32 in this embodiment can be used.

[0039] The radial extension handle 33 includes an outer cone 331 for inserting the radial extension section 32, a printing extension ring 332 and a columnar handle 333 for inserting the radial medullary cavity. The printing extension ring 332 is stepped at one end close to the columnar handle 333 to prevent the prosthesis from sinking.

[0040] A plurality of triangular needles 334 are arranged on one side of the columnar handle 333 connected to the printed extension ring 332. The plurality of triangular needles 334 are evenly arranged on the outer wall of the columnar handle 333, so that the prosthesis can grow into the bone better and better integrate with the medullary cavity. A plurality of tuning forks 335 are arranged on the other side of the columnar handle 333. The tuning forks 335 can be retracted when inserted into the radial medullary cavity, so that they can be better implanted. The outer side of each tuning fork 335 forms an annular groove 336, which is a natural curvature to provide a modified matching degree to prevent the occurrence of postoperative wrist pain.

[0041] Embodiment 2: See also Figure 7 , the difference between the second embodiment and the first embodiment is that the radial component is slightly different. In the second embodiment, the radial component includes a radial support 31, but the side of the radial support 31 away from the carpal pad 12 is connected to a radial stem cone 34, and the end of the radial stem cone 34 away from the radial support 31 is connected to the proximal end 35 of the print handle. The end of the proximal end 35 of the print handle away from the radial stem cone 34 is connected to the distal end 36 of the print handle, and the distance between the proximal end 35 of the print handle and the distal end 36 of the print handle is adjustable. The material of the radial stem cone 34, the proximal end 35 of the print handle and the distal end 36 of the print handle is a titanium metal print part or a tantalum metal print part.

[0042] Specifically, the end of the proximal end 35 of the printing handle facing the radial stem cone 34 is solid, and the cross-section of the proximal end 35 of the printing handle can ensure axial and rotational stability, and the proximal end 35 of the printing handle is designed with a low-profile outer side, which can facilitate the insertion of the prosthesis under minimally invasive incision operation.

[0043] The end of the proximal end 35 of the print handle away from the radial handle cone 34 is cylindrical, and a guide groove is provided on the cylindrical side wall. The distal end 36 of the print handle is sleeved on the cylindrical end of the proximal end 35 of the print handle, and a guide bar that cooperates with the guide groove is provided on the inner wall of the distal end 36 of the print handle. The guide bar moves along the guide groove to adjust the positional relationship between the proximal end 35 of the print handle and the distal end 36 of the print handle. After the position is adjusted, it is fixed by a pin.

[0044] The radial stem taper 34 in this embodiment is not eccentric, and when the patient's radius is in a standard position and does not deviate from the carpal bone, the radial assembly in the second embodiment can be used. In addition, the positions of the proximal end 35 and the distal end 36 of the print handle in the second embodiment are adjustable, so that the length of the radial assembly can be adjusted according to the position of the radial medullary cavity, thereby being better implanted into the radial medullary cavity.

[0045] Embodiment three: See also Figure 8 The difference between the third embodiment and the second embodiment is that the radial assembly is slightly different. In the third embodiment, the radial assembly includes a radial support 31, but the side of the radial support 31 away from the carpal pad 12 is connected to a radial stem cone 34, and the end of the radial stem cone 34 away from the radial support 31 is connected to a hollow printing handle 37, and a printing cone 38 is inserted in the printing handle 37. The printing cone 38 and the printing handle 37 are screwed together by a distal body 39 to form a radial handle.

[0046] Specifically, the distal body 39 is sleeved on an end of the printing handle 37 into which the printing cone 38 is inserted, which is away from the radial handle cone 34, and is fixed axially using screws.

[0047] The printing handle 37 in this embodiment is a hollow structure and has a certain elasticity. When implanted into the radial medullary cavity, the printing handle 37 can undergo a certain deformation toward the printing cone 38, which not only ensures the corresponding strength of the radial handle as a solid structure, but also facilitates the implantation of the prosthesis and alleviates the patient's pain.

[0048] In addition, several through vertical notches can be opened on the side wall of the print handle 37 so that the diameter of the inserted print cone 38 can be appropriately reduced, thereby ensuring that the print handle 37 has a certain amount of deformation toward the central axis. At the same time, inserting the print cone 38 in the hollow print handle 37 ensures that the print handle 37 is essentially a solid structure with a corresponding degree of firmness, which is beneficial to the implantation of the prosthesis and reduces the patient's pain.

[0049] The present invention can provide diversified assembly and coordination, is a universal standardized prosthesis, can save operation time, and is suitable for patients undergoing first operation or local tumors.

[0050] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A wrist joint prosthesis, characterized in that: include: A carpal bone component 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 arranged on the carpal bone pad (12); A radial component used for fixing to the radial medullary cavity comprises 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).

2. A wrist joint prosthesis according to claim 1, characterized in that: 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 an end of the threaded middle section (22) away from the adjustment cap (21), the column (23) being used for being plugged into the wrist bone pad (12), and a plurality of vertical grooves (24) being 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 threaded middle section (22), 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).

3. A wrist joint prosthesis according to claim 2, characterized in that: The locking member comprises a thick screw section (41) and a thin positioning rod (42) connected to the thick screw section (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 section (41); and the thick screw section (41) and the insertion hole (121) are threadedly connected.

4. A wrist joint prosthesis according to claim 2 or 3, characterized in that: A plurality of annular grooves (211) are provided at intervals on the side wall of the adjustment cap (21).

5. 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 the radial extension section (32), and the end of the radial extension section (32) away from the radial support (31) is eccentric and connected to the radial extension handle (33), and the radial extension handle (33) is used for fixing to the radial medullary cavity.

6. A wrist joint prosthesis according to claim 5, characterized in that: The radial extension handle (33) comprises an outer cone (331) for inserting into the radial extension section (32), a printed extension ring (332), and a columnar handle (333) for inserting into the radial medullary cavity, which are connected in sequence.

7. The wrist joint prosthesis according to claim 6, characterized in that: One end of the columnar handle (333) connected to the printing extension ring (332) is provided with a plurality of triangular needle spikes (334), and the other end is provided with a plurality of tuning forks (335), and an annular groove (336) is formed on the outer side surface of each tuning fork (335).

8. 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 a proximal end (35) of the printing handle, and the end of the proximal end (35) of the printing handle away from the radial stem cone (34) is connected to a distal end (36) of the printing handle, and the distance between the proximal end (35) of the printing handle and the distal end (36) of the printing handle is adjustable.

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