High-stability durable tibial prosthesis

Abstract

The utility model relates to the technical field of medical instruments, and discloses a high-stability durable tibial prosthesis which comprises a locking mechanism, the locking mechanism is of a double-layer structure, an anti-rotation mechanism is rotatably arranged on the lower end face of the locking mechanism, a telescopic mechanism is movably arranged on the lower end face of the anti-rotation mechanism, and an implanting mechanism is fixedly arranged on the lower end face of the telescopic mechanism. The locking mechanism comprises a locking hole, a side wing steel plate, a tibial plateau, a bone trabecula porous structure, a locking bone screw, a first suture hole and a second suture hole, the anti-rotation mechanism comprises an anti-rotation block, an anti-rotation groove, a first cylindrical pin and an anti-rotation rod, and the telescopic mechanism comprises a telescopic handle, a second through hole, a second cylindrical pin, an adjusting button and an adjusting shaft. The implanting mechanism comprises an intramedullary nail and a bone cement groove. According to the bone trabecula prosthesis, the retraction mechanism is arranged and can be adjusted according to the requirements of different patients, and the bone trabecula porous structure and the anti-rotation mechanism are arranged, so that the prosthesis can be kept stable.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a highly stable and durable tibial prosthesis. Background Art

[0002] A tibial prosthesis is a medical device used in tibial fracture or joint replacement surgery. It is typically used to replace damaged or degenerated parts of the tibia to restore leg function and stability. The tibial prosthesis needs to bear the weight of the body and the forces during activities, so high stability ensures that the prosthesis will not shift or loosen when bearing these loads, thereby providing long-lasting support. The high durability design enables the prosthesis to withstand friction and pressure during long-term use, reducing the risk of prosthesis damage or failure, and ensuring that it maintains effective function throughout its service life.

[0003] The existing patent (CN209004330U) is a mid-upper tibial tumor-type prosthesis, which includes a prosthesis body that is consistent with the shape of the mid-upper tibial bone, a wing steel plate fixed to the proximal articular surface, and an intramedullary nail fixed to the distal medullary cavity; the wing steel plate is fixedly connected to the upper end of the prosthesis body, and the intramedullary nail is fixedly connected to the lower end of the prosthesis body. In this mid-upper tibial tumor-type prosthesis, the wing steel plate is located away from the proximal tibial nerve, blood vessels and soft tissue connection, retaining the proximal articular surface and periarticular blood supply, which can restore the anatomical morphology and function of the knee joint to the greatest extent. The wing steel plate is relatively small, which reduces tissue irritation. Its parallel fixation only requires a unilateral incision, avoiding blood supply disruption and reducing postoperative complications, which is in line with the concept of minimally invasive surgery. The distal intramedullary nail adopts a combination of sliding hole and static hole technology, which makes the overall mechanical distribution of the prosthesis more balanced after implantation, and enhances long-term stability.

[0004] In the process of implementing this application, the inventors discovered that the prior art has the following problems:

[0005] This utility model has an integrated structure and cannot be disassembled, which is not conducive to checking the status of the implant for repair or replacement, increases the additional surgical risk for the patient, and is not conducive to adjusting the patient's bones or surrounding tissues. Secondly, the structure of this utility model is relatively fixed and cannot adapt to the needs of different patients.

[0006] Therefore, those skilled in the art provide a highly stable and durable tibial prosthesis to solve the problems raised in the above background technology. Utility Model Content

[0007] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a highly stable and durable tibial prosthesis, which is easy to disassemble and adjust and is relatively stable and durable.

[0008] To achieve the above objectives, the present invention provides the following technical solutions: a highly stable and durable tibial prosthesis, comprising a locking mechanism having a double-layer structure, wherein the lower end surface of the locking mechanism is rotatably provided with an anti-rotation mechanism, the lower end surface of the anti-rotation mechanism is movably provided with a telescopic mechanism, and the lower end surface of the telescopic mechanism is fixedly provided with an implant mechanism;

[0009] The locking mechanism includes a locking hole, a flank steel plate, a tibial plateau, a trabecular porous structure, a locking bone screw, a first suture hole and a second suture hole; the anti-rotation mechanism includes an anti-rotation block, an anti-rotation groove, a first cylindrical pin and an anti-rotation rod; the telescopic mechanism includes a telescopic handle, a second through hole, a second cylindrical pin, an adjustment button and an adjustment shaft; and the implantation mechanism includes an intramedullary nail and a bone cement groove.

[0010] Furthermore, there are two flank steel plates, both of which are C-shaped, and the locking holes are arranged on the outer walls of the two flank steel plates. There are four locking holes, and the locking bone screws are threadedly connected to the four locking holes.

[0011] Furthermore, the tibial plateau is fixedly provided on the lower end surface of the flank steel plate, the first suture holes are fixedly provided on the outer walls on both sides of the tibial plateau, and the number of the first suture holes is four, and the second suture holes are fixedly provided on the front end surface of the tibial plateau, and the number of the second suture holes is two.

[0012] Furthermore, the anti-rotation block is L-shaped, and is movably arranged in the inner cavity of the anti-rotation groove. The first cylindrical pin is fixedly arranged on the upper end surface of the anti-rotation groove, and the through hole on the bottom end surface of the anti-rotation block is engaged with the first cylindrical pin.

[0013] Furthermore, the second through hole is fixedly provided on the upper end surface of the telescopic handle, the telescopic handle passes through the bottom end surface of the anti-rotation rod, the adjustment button is fixedly provided on the outer wall of the anti-rotation rod and close to one end of the telescopic handle, the adjustment shaft passes through the adjustment button and is connected to the two side plates, the second cylindrical pin is fixedly provided on the lower end surface of the adjustment button, and the second cylindrical pin is engaged with the second through hole.

[0014] Furthermore, the intramedullary nail is fixedly arranged on the lower end surface of the telescopic handle, and the bone cement groove is fixedly arranged around the outer wall of the intramedullary nail, and there are multiple bone cement grooves.

[0015] Furthermore, an outer thread is fixedly provided on an upper section of an outer wall of the telescopic handle, and an inner thread is fixedly provided on an inner wall of the anti-rotation rod, and the inner thread is screwed together with the outer thread.

[0016] The utility model has the following beneficial effects:

[0017] 1. The utility model proposes a highly stable and durable tibial prosthesis. By providing a porous structure of trabeculae, it can effectively support body weight while keeping the bone light. The porous structure increases the surface area of bone tissue, which helps the exchange of nutrients and metabolites in the bone. While maintaining strength, it has a certain degree of flexibility and adaptability. By providing an anti-rotation mechanism, it can avoid asymmetric docking between the prosthesis and the bone or other structures, reduce discomfort, ensure that the prosthesis remains stable during various activities, reduce the risk of falls or other accidents, and at the same time reduce wear or damage caused by rotation, thereby extending the service life of the prosthesis.

[0018] 2. The utility model proposes a highly stable and durable tibial prosthesis. By setting a retraction mechanism, a locking bone screw is used to lock through the flank steel plate, thereby reducing tissue irritation and effectively fixing the prosthesis. The ligament at the upper end can be effectively attached through two suture holes to increase the stability of the prosthesis. By setting a telescopic mechanism, the telescopic handle can be extended and retracted, and can be adjusted according to the needs of different patients, thereby expanding the user population of the prosthesis. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the utility model;

[0020] Figure 2 This is a schematic diagram of the anti-rotation mechanism of the utility model;

[0021] Figure 3 This is a schematic diagram of the telescopic mechanism of the present utility model;

[0022] Figure 4 This is a schematic diagram of the implantation mechanism of the present invention.

[0023] Legend:

[0024] 1. Locking mechanism; 2. Anti-rotation mechanism; 3. Telescopic mechanism; 4. Implantation mechanism; 101. Locking hole; 102. Side plate; 103. Tibial plateau; 104. Porous trabecular structure; 105. Locking bone screw; 106. First suture hole; 107. Second suture hole; 201. Anti-rotation block; 202. Anti-rotation groove; 203. First cylindrical pin; 204. Anti-rotation rod; 301. Telescopic handle; 302. Second through hole; 303. Second cylindrical pin; 304. Adjustment button; 305. Adjustment shaft; 401. Intramedullary nail; 402. Bone cement groove. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] Reference Figure 1-4 , an embodiment provided by the utility model:

[0027] A highly stable and durable tibial prosthesis includes a locking mechanism 1 having a double-layer structure. The lower end surface of the locking mechanism 1 is rotatably provided with an anti-rotation mechanism 2. The lower end surface of the anti-rotation mechanism 2 is movably provided with a telescopic mechanism 3. The lower end surface of the telescopic mechanism 3 is fixedly provided with an implant mechanism 4.

[0028] The locking mechanism 1 includes a locking hole 101, a lateral steel plate 102, a tibial plateau 103, a trabecular porous structure 104, a locking bone screw 105, a first suture hole 106 and a second suture hole 107. The anti-rotation mechanism 2 includes an anti-rotation block 201, an anti-rotation groove 202, a first cylindrical pin 203 and an anti-rotation rod 204. The telescopic mechanism 3 includes a telescopic handle 301, a second through hole 302, a second cylindrical pin 303, an adjustment button 304 and an adjustment shaft 305. The implantation mechanism 4 includes an intramedullary nail 401 and a bone cement groove 402.

[0029] Specifically, the locking mechanism 1 is a double-layer structure and is made of titanium alloy, which can resist corrosion well. The anti-rotation mechanism 2 is a detachable structure. When clamped and fixed, the convex state of the cylindrical pin ensures that the upper end surface of the anti-rotation mechanism 2 will not drive the locking mechanism 1 to rotate as a whole, thereby achieving a good fixing effect. By setting up the telescopic mechanism 3, the telescopic mechanism 3 can be rotated to the required length through the upper end thread and then engaged through the second cylindrical pin 303 to fix the telescopic mechanism 3. The diameter of the implantation mechanism 4 is smaller than that of the telescopic mechanism 3. When the telescopic mechanism 3 is screwed into the lower end medullary cavity, damage to surrounding tissues can be reduced.

[0030] Reference Figure 1 There are two flank steel plates 102, both of which are C-shaped. Locking holes 101 are provided on the outer walls of the two flank steel plates 102. There are four locking holes 101, and locking bone screws 105 are threadedly connected to the four locking holes 101.

[0031] The tibial plateau 103 is fixedly provided on the lower end surface of the wing steel plate 102, and the first suture holes 106 are fixedly provided on the outer walls of both sides of the tibial plateau 103, and the number of the first suture holes 106 is four. The second suture holes 107 are fixedly provided on the front end surface of the tibial plateau 103, and the number of the second suture holes 107 is two.

[0032] Specifically, by providing a flank steel plate 102, and the flank steel plate 102 is smaller in shape, irritation to nearby tissues can be reduced. Through the cooperation of the flank steel plate 102 and the locking bone screw 105, the locking bone screw 105 is screwed into the area with more bone at the upper end. The area with more bone usually provides better support and stability, which helps to fix the fracture or implant. Double fixation is then performed through the porous structure 104 of the trabeculae, which effectively ensures the stability of the prosthesis. Reconstruction sutures can be conveniently performed through the first suture hole 106 and the second suture hole 107, and the upper ligament is attached to the upper end of the locking mechanism 1.

[0033] Reference Figure 2 The anti-rotation block 201 is L-shaped, and the anti-rotation block 201 is movably arranged in the inner cavity of the anti-rotation groove 202. The first cylindrical pin 203 is fixedly arranged on the upper end surface of the anti-rotation groove 202, and the through hole on the bottom end surface of the anti-rotation block 201 is engaged with the first cylindrical pin 203;

[0034] Specifically, the height of the anti-rotation block 201 is smaller than the height of the anti-rotation groove 202. The anti-rotation block 201 rotates into the anti-rotation groove 202 and presses downward to the top of the first cylindrical pin 203, so that the through hole at the bottom end of the anti-rotation block 201 engages with the anti-rotation groove 202 to prevent it from rotating left and right, while enhancing the stability of the locking mechanism 1 connected to the upper end face of the anti-rotation rod 204.

[0035] Reference Figure 3 The second through hole 302 is fixedly provided on the upper end surface of the telescopic handle 301, and the telescopic handle 301 passes through the bottom end surface of the anti-rotation rod 204. The adjustment button 304 is fixedly provided on the outer wall of the anti-rotation rod 204 and is close to one end of the telescopic handle 301. The adjustment shaft 305 passes through the adjustment button 304 and is connected to the two side plates. The second cylindrical pin 303 is fixedly provided on the lower end surface of the adjustment button 304, and the second cylindrical pin 303 is engaged with the second through hole 302.

[0036] The upper section of the outer wall of the telescopic handle 301 is fixedly provided with an external thread, and the inner wall of the anti-rotation rod 204 is fixedly provided with an internal thread, and the internal thread is screwed together with the external thread;

[0037] Specifically, by setting the second through hole 302, the second cylindrical pin 303 on the adjustment button 304 can be engaged and adjusted to fix it. There are multiple second through holes 302, and the adjustable range is large. The adjustment button 304 can be pressed at the front and back ends through 305 to raise and lower the second cylindrical pin 303, which makes it more convenient to adjust the length according to the conditions of different patients.

[0038] Reference Figure 4 The intramedullary nail 401 is fixedly arranged on the lower end surface of the telescopic handle 301, and the bone cement groove 402 is fixedly arranged around the outer wall of the intramedullary nail 401. There are multiple bone cement grooves 402;

[0039] Specifically, by placing bone cement in the bone cement groove 402, the bone cement can help fill the gap between the prosthesis and the bone, improve the fixation of the prosthesis, reduce the movement or rotation of the prosthesis during use, and alleviate the discomfort or pain caused by friction between the prosthesis and the bone.

[0040] Working principle: When using the present invention, bone cement is first placed in the implant mechanism 4 and then the implant mechanism 4 is immediately placed in the medullary cavity at the lower end. Then, the telescopic handle 301 is adjusted according to the patient's condition and the second cylindrical pin 303 on the adjustment button 304 is used to engage and fix it. Next, the first cylindrical pin 203 connected to the anti-rotation mechanism 2 is rotated into the anti-rotation groove 202 and engaged with the first cylindrical pin 203. The entire locking mechanism 1 is connected to the upper end surface of the anti-rotation mechanism 2 and is fixed at the same time.

[0041] Next, the locking bone screws 105 are inserted into the four locking holes 101 through the wing steel plates 102 , and the locking bone screws 105 are locked and fixed to the areas with more bone, thereby achieving a stable effect.

[0042] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A highly stable and durable tibial prosthesis, comprising a locking mechanism (1), characterized in that: The locking mechanism (1) is a double-layer structure, the lower end surface of the locking mechanism (1) is rotatably provided with an anti-rotation mechanism (2), the lower end surface of the anti-rotation mechanism (2) is movably provided with a telescopic mechanism (3), and the lower end surface of the telescopic mechanism (3) is fixedly provided with an implantation mechanism (4); The locking mechanism (1) comprises a locking hole (101), a flank steel plate (102), a tibial plateau (103), a trabecular porous structure (104), a locking bone screw (105), a first suture hole (106) and a second suture hole (107); the anti-rotation mechanism (2) comprises an anti-rotation block (201), an anti-rotation groove (202), a first cylindrical pin (203) and an anti-rotation rod (204); the telescopic mechanism (3) comprises a telescopic handle (301), a second through hole (302), a second cylindrical pin (303), an adjustment button (304) and an adjustment shaft (305); and the implantation mechanism (4) comprises an intramedullary nail (401) and a bone cement groove (402).

2. The highly stable and durable tibial prosthesis according to claim 1, characterized in that: The number of the flank steel plates (102) is two, and both of the flank steel plates (102) are C-shaped. The locking holes (101) are arranged on the outer walls of the two flank steel plates (102), and the number of the locking holes (101) is four. The locking bone screws (105) are threadedly connected to the four locking holes (101).

3. The highly stable and durable tibial prosthesis according to claim 1, characterized in that: The tibial plateau (103) is fixedly arranged on the lower end surface of the flank steel plate (102), the first suture holes (106) are fixedly arranged on the outer walls on both sides of the tibial plateau (103), and the number of the first suture holes (106) is four, and the second suture holes (107) are fixedly arranged on the front end surface of the tibial plateau (103), and the number of the second suture holes (107) is two.

4. The highly stable and durable tibial prosthesis according to claim 1, characterized in that: The anti-rotation block (201) is L-shaped, and the anti-rotation block (201) is movably arranged in the inner cavity of the anti-rotation groove (202). The first cylindrical pin (203) is fixedly arranged on the upper end surface of the anti-rotation groove (202), and the through hole on the bottom end surface of the anti-rotation block (201) is engaged with the first cylindrical pin (203).

5. The highly stable and durable tibial prosthesis according to claim 1, characterized in that: The second through hole (302) is fixedly arranged on the upper end surface of the telescopic handle (301), and the telescopic handle (301) passes through the bottom end surface of the anti-rotation rod (204). The adjustment button (304) is fixedly arranged on the outer wall of the anti-rotation rod (204) and close to one end of the telescopic handle (301). The adjustment shaft (305) passes through the adjustment button (304) and is connected to the two side plates. The second cylindrical pin (303) is fixedly arranged on the lower end surface of the adjustment button (304), and the second cylindrical pin (303) is engaged with the second through hole (302).

6. The highly stable and durable tibial prosthesis according to claim 1, characterized in that: The intramedullary nail (401) is fixedly arranged on the lower end surface of the telescopic handle (301), and the bone cement groove (402) is fixedly arranged around the outer wall of the intramedullary nail (401). There are multiple bone cement grooves (402).

7. The highly stable and durable tibial prosthesis according to claim 1, characterized in that: An external thread is fixedly provided on the upper section of the outer wall of the telescopic handle (301), and an internal thread is fixedly provided on the inner wall of the anti-rotation rod (204), and the internal thread is screwed together with the external thread.

Images