Knee joint prosthesis

Abstract

The invention belongs to the technical field of medical treatment, and discloses a knee joint prosthesis which comprises a cushion block, a tibia platform is connected to the bottom of the cushion block, and a connecting block is arranged at the bottom of the tibia platform. An extension rod is held to drive an insertion rod to move upwards along the inner wall of a connecting cylinder, the insertion rod drives a first rectangular block to move upwards, when rectangular holes formed in the two outer sides of the first rectangular block coincide with rectangular holes formed in the two outer sides of a second rectangular block, a cross wrench is taken to enter a circular hole in the outer portion of a connecting block to make contact with a circular block, and the circular block is rotated to drive a threaded rod to rotate; a threaded rod rotates to drive a first pulley to rotate, a belt and a second pulley to rotate, a threaded rod on the other side is driven to rotate, a bolt is driven to move towards the middle along positive and negative threads arranged outside the threaded rod, the fixing effect on a first rectangular block and a second rectangular block is improved, and fixing of the first rectangular block and the second rectangular block is improved in the process; the situation that the prosthesis is loosened is reduced, and the stability of the knee joint prosthesis is improved.

Description

Technical Field

[0001] The invention belongs to the field of medical technology, in particular to a knee joint prosthesis. Background Art

[0002] Knee prosthesis is one of the methods used to treat knee pain and dysfunction caused by degenerative orthopedic diseases or accidental injuries. The prosthesis is usually made of metal alloys, high-strength polyethylene or ceramics, and is used to replace the damaged or lost natural knee joint. Knee prosthesis surgery is a highly subjective operation, and the doctor needs to choose the most suitable prosthesis, surgical method and surgical approach based on the specific situation of each patient. Certain rehabilitation training is required after the operation to restore the normal function of the knee joint. Although knee prosthesis can improve the patient's pain and motor function, if it is not used and maintained correctly, the prosthesis will wear, loosen and have other problems, requiring re-surgery to repair or replace it. Generally, this surgery is performed when the pain caused by severe knee arthritis, osteoarthritis, degenerative joint disease and other joint injuries cannot be relieved.

[0003] First of all, knee prostheses are used to replace damaged or severely painful parts of the knee joint to restore the function of the knee joint and relieve pain. However, improper use by patients may cause wear and loosening of the prosthesis, which will cause pain in the patient's knee joint and require the patient to undergo re-surgery, repair and renovation. An extension rod is connected to the insertion rod, and the extension rod plays an effective role in supplementing stability and supporting the tibial platform. At the same time, it has the maximum restraint on tibiofemoral movement, thereby increasing the stability of the knee prosthesis. Most existing prostheses have an external insertion rod and an extension rod that are installed by rotating the nut. This installation method is relatively simple. Long-term improper use of the knee prosthesis may easily cause loosening. Therefore, a knee prosthesis is now proposed. Summary of the Invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides a knee joint prosthesis, which solves the problem that the extension rod connection method is simple and has poor stability, and the knee joint prosthesis may become loose and reduce the overall stability of the knee joint prosthesis if used improperly for a long time.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a knee joint prosthesis, comprising a pad, the bottom of the pad is connected to the tibial plateau, the bottom of the tibial plateau is provided with a connecting block, the outside of the connecting block is installed with a connecting cylinder, the bottom of the connecting cylinder is connected to an extension rod, the bottom of the pad is fixed with a first protrusion, the inner side of the tibial plateau is provided with a ring, the interior of the ring is sleeved with a first connecting rod, the top surface of the ring is provided with a first spring, the top of the first connecting rod is fixed with a second protrusion, the interior of the connecting block is provided with a second rectangular block, the interior of the second rectangular block is sleeved with A first rectangular block, a first connecting plate and a second connecting plate are respectively installed on both sides of the outside of the second rectangular block, the first connecting plate is fixedly installed on the outside of the first connecting plate, the second rectangular block is fixedly installed on the outside of the second connecting plate, a threaded rod is sleeved on one end of the outside of the first connecting plate, a first pulley is sleeved on the outside of the threaded rod, a belt is connected to the outside of the first pulley, a second pulley is installed on the inside of the belt, a fourth connecting plate and a third connecting plate are respectively sleeved on both ends of the outside of the threaded rod, the second connecting rod is sleeved on the inside of the fourth connecting plate, and a second spring is provided on the outside of the second connecting rod.

[0006] Preferably, grooves are provided on both sides of the exterior of the first protrusion, a rectangular hole is provided on the top surface of the tibial plateau, and the first protrusion slides vertically in the rectangular hole.

[0007] Preferably, a rectangular groove is formed on the inner side of the tibial plateau, and the rectangular grooves are equidistantly distributed at both ends of the outer side of the first protrusion.

[0008] Preferably, the second protrusion is in a semicircular arc shape, and the upper and lower sides of the second protrusion are in contact with the upper and lower sides of the groove.

[0009] Preferably, a circular hole is provided on the outside of the connecting block, forward and reverse threads are provided on the outside of the threaded rod, and a round block is installed at one end of the threaded rod, and a cross groove is provided on the outside of the round block.

[0010] Preferably, rectangular holes are opened on the outside of the first rectangular block and the second rectangular block, and the rectangular holes pass through both sides of the outside of the first rectangular block and the second rectangular block.

[0011] Preferably, the first rectangular block is engaged with the rectangular hole, and the outer side of the first rectangular block contacts the inner side of the second rectangular block.

[0012] Preferably, circular holes are opened on the outside of the fourth connecting plate and the third connecting plate, the second connecting rod is installed in the circular holes, one end of the second spring is installed on the outside of the first connecting plate, and the other end of the second spring is installed on the outside of the fourth connecting plate.

[0013] Preferably, corner ears are installed on both sides of the exterior of the second rectangular block, and bolts are provided inside the corner ears, and the bolts are connected to the external threads of the threaded rod.

[0014] Preferably, an insertion rod is provided at the bottom of the first rectangular block, and the outer diameter of the insertion rod is equal to the inner diameter of the connecting cylinder.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention drives the insertion rod to move upward along the inner wall of the connecting cylinder by holding the extension rod, and the insertion rod drives the first rectangular block to move upward. When the rectangular holes opened on both sides of the outside of the first rectangular block and the second rectangular block coincide with each other, a cross wrench is taken and inserted into the circular hole outside the connecting block to contact the circular block. The rotating circular block drives the threaded rod to rotate, and the rotation of the threaded rod drives the first pulley to rotate, and the belt and the second pulley to rotate, thereby driving the threaded rod on the other side to rotate, and at the same time drives the bolt to move toward the middle along the positive and negative threads set on the outside of the threaded rod, and drives the first connecting plate and the second connecting plate to approach the second rectangular block through the bolt. The first connecting plate and the second connecting plate drive the first rectangular block and the second rectangular block to be inserted into the rectangular holes opened on the outside of the second rectangular block and the first rectangular block, thereby fixing the second rectangular block and the first rectangular block, and fixing the insertion rod and the extension rod at the same time. The second connecting rod and the fourth connecting plate are driven to move through the first connecting plate and the second connecting plate, and the fourth connecting plate and the first connecting plate are squeezed and compressed to increase the fixing effect of the first rectangular block and the second rectangular block. In this process, the fixation of the first rectangular block and the second rectangular block is improved, the loosening of the prosthesis is reduced, and the stability of the knee joint prosthesis is improved.

[0016] The present invention places a pad on the top of the tibial platform, presses the pad downward to drive the first protrusion to move vertically downward along the rectangular hole opened on the top of the tibial platform, and when the bottom of the first protrusion contacts the outside of the second protrusion, the second protrusion is forced to squeeze backward and the first spring is compressed, and at the same time drives the first connecting rod to shrink along the inner wall of the circular ring, and drives the second protrusion to move backward through the first connecting rod. When the bottom of the first protrusion contacts the bottom of the rectangular hole, the first spring returns to drive the first connecting rod and the second protrusion to move forward and get stuck in the groove opened on the outside of the first protrusion, and fixes the first protrusion through the second protrusion, thereby reducing the wear on the pad. In this process, the service life of the pad is improved and the cost loss caused by pad damage is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the combined structure of the pad and tibial plateau of the present invention; Figure 3 This is a schematic diagram of the combined structure of the connecting block and the connecting cylinder of the present invention; Figure 4 This is a schematic diagram of the cross-sectional structure of the connecting block of the present invention; Figure 5 This is a schematic diagram of the combined structure of the first rectangular block, the connecting cylinder, and the insertion rod of the present invention; Figure 6 This is a schematic diagram of the combined structure of the second rectangular block, threaded rod, first connecting plate, second connecting plate, third connecting plate, and fourth connecting plate of the present invention; Figure 7 This is a schematic diagram of the cross-sectional structure of the second rectangular block of the present invention; Figure 8 For the present invention Figure 7 Schematic diagram of the enlarged structure at point A in the middle.

[0018] In the figure: 1. pad; 2. tibial plateau; 3. connecting block; 4. connecting cylinder; 5. extension rod; 6. first protrusion; 7. ring; 8. first connecting rod; 9. first spring; 10. second protrusion; 11. first rectangular block; 12. second rectangular block; 13. first connecting plate; 14. second connecting plate; 15. third connecting plate; 16. fourth connecting plate; 17. threaded rod; 18. second connecting rod; 19. second spring; 20. first pulley; 21. belt; 22. first rectangular block; 23. second rectangular block; 24. second pulley. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments 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.

[0020] like Figures 1 to 8As shown, the present invention provides a knee joint prosthesis, including a pad 1, the bottom of the pad 1 is connected to the tibial plateau 2, the bottom of the tibial plateau 2 is provided with a connecting block 3, the outside of the connecting block 3 is installed with a connecting cylinder 4, the bottom of the connecting cylinder 4 is connected to an extension rod 5, the bottom of the pad 1 is fixed with a first protrusion 6, the inner side of the tibial plateau 2 is provided with a ring 7, the inside of the ring 7 is sleeved with a first connecting rod 8, the top surface of the ring 7 is provided with a first spring 9, the top of the first connecting rod 8 is fixed with a second protrusion 10, the inside of the connecting block 3 is provided with a second rectangular block 12, the inside of the second rectangular block 12 is sleeved with the first rectangular block 11, the outside of the second rectangular block 12 A first connecting plate 13 and a second connecting plate 14 are respectively installed on both sides. A first rectangular block 22 is fixed to the outside of the first connecting plate 13, and a second rectangular block 23 is fixed to the outside of the second connecting plate 14. A threaded rod 17 is sleeved on one end of the outside of the first connecting plate 13, and a first pulley 20 is sleeved on the outside of the threaded rod 17. A belt 21 is connected to the outside of the first pulley 20, and a second pulley 24 is installed on the inside of the belt 21. The fourth connecting plate 16 and the third connecting plate 15 are respectively sleeved on both ends of the outside of the threaded rod 17. The second connecting rod 18 is sleeved on the inside of the fourth connecting plate 16, and a second spring 19 is provided on the outside of the second connecting rod 18.

[0021] The above solution is adopted: when the extension rod 5 is connected to the insertion rod, the extension rod 5 is held to drive the insertion rod to move up along the inner wall of the connecting cylinder 4, and at the same time, the insertion rod drives the first rectangular block 11 to move up along the inner wall of the second rectangular block 12. When the rectangular holes opened on both sides of the outside of the first rectangular block 11 and the second rectangular block 12 coincide with each other, a cross wrench is passed through the circular hole outside the connecting block 3 to make the cross wrench contact with the round block installed on the outside of the threaded rod 17. The rotating round block drives the threaded rod 17 to rotate, and the rotation of the threaded rod 17 drives the first pulley 20 to rotate. The belt 21 and the second pulley 24 are driven to rotate, thereby driving the threaded rod 17 on the other side to rotate, and at the same time driving the bolts connected to the external thread of the threaded rod 17 to move toward the middle along the positive and negative threads set on the external surface of the threaded rod 17, and the first connecting plate 13 and the second connecting plate 14 are driven by the bolts to approach the second rectangular block 12, and the first rectangular block 22 and the second rectangular block 23 are driven by the first connecting plate 13 and the second connecting plate 14 to be stuck in the rectangular holes opened on the outside of the second rectangular block 12 and the first rectangular block 11, thereby The first connecting plate 13 and the second connecting plate 14 drive the second connecting rod 18 and the fourth connecting plate 16 to move, and the fourth connecting plate 16 and the first connecting plate 13 squeeze the second spring 19 to be compressed, and the fixing effect of the first rectangular block 11 and the second rectangular block 12 is increased by the second spring 19, the second connecting rod 18 and the fourth connecting plate 16. At this time, the pad 1 is placed on the top of the tibial plate 2, and the pad 1 is pressed downward to drive the first protrusion 6 to move vertically downward along the rectangular hole opened on the top of the tibial plate 2. When the first protrusion 6 is When the bottom contacts the outside of the second protrusion 10, the second protrusion 10 is forced to squeeze backward and the first spring 9 is compressed, while driving the first connecting rod 8 to shrink along the inner wall of the ring 7. The second protrusion 10 is driven backward by the first connecting rod 8. When the bottom of the first protrusion 6 contacts the bottom of the rectangular hole, the first spring 9 resets and drives the first connecting rod 8 and the second protrusion 10 to move forward and get stuck in the groove opened on the outside of the first protrusion 6. The first protrusion 6 is fixed by the second protrusion 10, thereby reducing the wear on the pad 1 and improving the overall stability of the prosthesis in the process.

[0022] like Figure 1 and Figure 2 As shown, grooves are provided on both sides of the outside of the first protrusion 6, and a rectangular hole is provided on the top surface of the tibial plateau 2, and the first protrusion 6 slides vertically in the rectangular block hole; a rectangular groove is provided on the inner side of the tibial plateau 2, and the rectangular grooves are equidistantly distributed at both ends of the outside of the first protrusion 6; the second protrusion 10 is semicircular, and the upper and lower sides of the second protrusion 10 are in contact with the upper and lower sides of the groove.

[0023] When the first protrusion 6 is moved down, the second protrusion 10 is pressed against the first spring 9 and the second protrusion 10 is pressed against the first spring 9, so that the first protrusion 6 is pressed against the first spring 9 and the second spring 9 is pressed against the first spring 9. When the first protrusion 6 is moved down, the second protrusion 10 is pressed against the second spring 9 and the second spring 9 is pressed against the first spring 9. When the first protrusion 6 is moved down, the second protrusion 10 is pressed against the second spring 9 and the second spring 9 is pressed against the first spring 9. When the first protrusion 6 is moved down, the second protrusion 10 is pressed against the second spring 9 and the second spring 9 is pressed against the second spring 9. When the first protrusion 6 is moved down, the second protrusion 10 is pressed against the second spring 9 and the second spring 9 is pressed against the second spring 9. When the first protrusion 6 is moved down, the second protrusion 10 is pressed against the second spring 9 and the second spring 9 is pressed against the second spring 9.

[0024] like Figure 1 、 Figure 3 、 Figure 4 、 Figure 6 、 Figure 7 and Figure 8 As shown, a circular hole is provided on the outside of the connecting block 3, and positive and negative threads are provided on the outside of the threaded rod 17, and a round block is installed at one end of the threaded rod 17, and a cross groove is provided on the outside of the round block; a circular hole is provided on the outside of the fourth connecting plate 16 and the third connecting plate 15, and the second connecting rod 18 is installed in the circular hole, one end of the second spring 19 is installed on the outside of the first connecting plate 13, and the other end of the second spring 19 is installed on the outside of the fourth connecting plate 16; corner ears are installed on both sides of the outside of the second rectangular block 12, and bolts are provided inside the corner ears, and the bolts are connected to the external threads of the threaded rod 17.

[0025] The above solution is adopted: by taking the cross handle and entering along the circular hole on the outside of the connecting block 3, the outside of the threaded rod 17 is provided with positive and negative threads, a round block is installed at one end of the threaded rod 17, and a cross groove is provided on the outside of the round block to facilitate adjustment of the distance between the first connecting plate 13, the second connecting plate 14, the third connecting plate 15, the fourth connecting plate 16 and the first rectangular block 11 and the second rectangular block 12, and angle ears are installed on both sides of the outside of the second rectangular block 12, and bolts are provided inside the angle ears, which are connected to the outer threads of the threaded rod 17. When the threaded rod 1 is rotated, 7, the bolt is driven to move along the positive and negative threads on the outside of the threaded rod 17, and at the same time, the bolt drives the first connecting plate 13 and the second connecting plate 14 to move, and the first rectangular block 22 and the second rectangular block 23 are driven by the first connecting plate 13 and the second connecting plate 14 to be clamped into the rectangular holes opened on the outside of the first rectangular block 11 and the second rectangular block 12, thereby fixing the first rectangular block 11 and the second rectangular block 12. In this process, the fixing effect of the first rectangular block 11 and the second rectangular block 12 is improved, and the loosening of the knee joint prosthesis is reduced.

[0026] like Figure 4 、 Figure 5 、 Figure 6 and Figure 7 As shown, a rectangular hole is opened on the outside of the first rectangular block 11 and the second rectangular block 12, and the rectangular hole passes through both sides of the outside of the first rectangular block 11 and the second rectangular block 12; the first rectangular block 22 is engaged with the rectangular hole, and the outer side of the first rectangular block 11 contacts the inner side of the second rectangular block 12; an insertion rod is provided at the bottom of the first rectangular block 11, and the outer diameter of the insertion rod is equal to the inner diameter of the connecting cylinder 4.

[0027] The above scheme is adopted: rectangular holes are opened on the outside of the first rectangular block 11 and the second rectangular block 12. When the threaded rod 17 rotates, it is convenient to drive the first rectangular block 22 and the second pulley 24 to quickly snap into the rectangular holes to fix the first rectangular block 11 and the second rectangular block 12, and an insertion rod is provided at the bottom of the first rectangular block 11. The outer diameter of the insertion rod is equal to the inner diameter of the connecting cylinder 4, which facilitates the disassembly between the insertion rod and the connecting cylinder 4. In this process, the stability of the connection between the insertion rod and the extension rod 5 is improved, and the occurrence of loosening of the knee joint prosthesis is reduced.

[0028] The working principle and use process of the present invention: First, when it is necessary to connect the extension rod 5 to the insertion rod set at the bottom of the first rectangular block 11, hold the extension rod 5 to drive the insertion rod to move up along the inner wall of the connecting cylinder 4, and at the same time, the insertion rod drives the first rectangular block 11 to move up along the inner wall of the second rectangular block 12. When the rectangular holes opened on both sides of the outside of the first rectangular block 11 and the second rectangular block 12 coincide with each other, a cross wrench is passed through the circular hole outside the connecting block 3 to make the cross wrench contact with the round block installed on the outside of the threaded rod 17. The rotating round block drives the threaded rod 17 to rotate, and the rotation of the threaded rod 17 drives the first pulley 20 to rotate. The first pulley 20 drives the belt 21 and the second pulley 24 to rotate, thereby driving the threaded rod 17 on the other side to rotate, and at the same time drives the bolts connected to the external thread of the threaded rod 17 to move toward the middle along the positive and negative threads set on the external surface of the threaded rod 17, and drives the first connecting plate 13 and the second connecting plate 14 to approach the second rectangular block 12 through the bolts, and drives the first rectangular block 22 and the second rectangular block 23 to be stuck in the rectangular holes opened on the outside of the second rectangular block 12 and the first rectangular block 11 through the first connecting plate 13 and the second connecting plate 14, thereby 12. The first rectangular block 11 is fixed, and the insertion rod and the extension rod are fixed at the same time. The second connecting rod 18 and the fourth connecting plate 16 are driven to move through the first connecting plate 13 and the second connecting plate 14. The second spring 19 is squeezed and compressed by the fourth connecting plate 16 and the first connecting plate 13. The fixing effect of the first rectangular block 11 and the second rectangular block 12 is increased by the second spring 19, the second connecting rod 18 and the fourth connecting plate 16. At this time, the pad 1 is placed on the top of the tibial plateau 2, and the pad 1 is pressed downward to drive the first protrusion 6 along the rectangular groove opened on the top of the tibial plateau 2. The rectangular hole moves vertically downward. When the bottom of the first protrusion 6 contacts the outside of the second protrusion 10, the second protrusion 10 is forced to squeeze backward and the first spring 9 is compressed, and at the same time drives the first connecting rod 8 to shrink along the inner wall of the ring 7, and drives the second protrusion 10 to move backward through the first connecting rod 8. When the bottom of the first protrusion 6 contacts the bottom of the rectangular hole, the first spring 9 resets and drives the first connecting rod 8 and the second protrusion 10 to move forward and get stuck in the groove opened on the outside of the first protrusion 6. The first protrusion 6 is fixed by the second protrusion 10, thereby reducing the wear on the pad 1.

[0029] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0030] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A knee joint prosthesis comprising a spacer (1), characterized in that: The bottom of the pad (1) is connected to the tibial platform (2), the bottom of the tibial platform (2) is provided with a connecting block (3), the outside of the connecting block (3) is installed with a connecting cylinder (4), the bottom of the connecting cylinder (4) is connected to an extension rod (5), the bottom of the pad (1) is fixed with a first protrusion (6), the inner side of the tibial platform (2) is provided with a ring (7), the inside of the ring (7) is provided with a first connecting rod (8), the top surface of the ring (7) is provided with a first spring (9), the top of the first connecting rod (8) is fixed with a second protrusion (10), the inside of the connecting block (3) is provided with a second rectangular block (12), the inside of the second rectangular block (12) is sleeved with the first rectangular block (11), and the outer sides of the second rectangular block (12) are respectively provided with A first connecting plate (13) and a second connecting plate (14) are installed. A first rectangular block (22) is fixedly installed on the outside of the first connecting plate (13), and a second rectangular block (23) is fixedly installed on the outside of the second connecting plate (14). A threaded rod (17) is sleeved on one end of the outside of the first connecting plate (13), and a first pulley (20) is sleeved on the outside of the threaded rod (17). A belt (21) is connected to the outside of the first pulley (20), and a second pulley (24) is installed on the inner side of the belt (21). A fourth connecting plate (16) and a third connecting plate (15) are sleeved on the two ends of the outside of the threaded rod (17), respectively. A second connecting rod (18) is sleeved on the inside of the fourth connecting plate (16), and a second spring (19) is provided on the outside of the second connecting rod (18).

2. The knee joint prosthesis according to claim 1, characterized in that: Grooves are provided on both sides of the exterior of the first protrusion (6), a rectangular hole is provided on the top surface of the tibial platform (2), and the first protrusion (6) slides vertically in the rectangular hole.

3. The knee joint prosthesis according to claim 2, characterized in that: A rectangular groove is formed on the inner side of the tibial platform (2), and the rectangular grooves are equidistantly distributed at both ends of the outer side of the first protrusion (6).

4. The knee joint prosthesis according to claim 2, characterized in that: The second protrusion (10) is in a semicircular arc shape, and the upper and lower sides of the second protrusion (10) are in contact with the upper and lower sides of the groove.

5. The knee joint prosthesis according to claim 1, characterized in that: A circular hole is provided on the outside of the connecting block (3), forward and reverse threads are provided on the outside of the threaded rod (17), and a round block is installed at one end of the threaded rod (17), and a cross groove is provided on the outside of the round block.

6. The knee joint prosthesis according to claim 1, characterized in that: A rectangular hole is provided on the outside of the first rectangular block (11) and the second rectangular block (12), and the rectangular hole passes through both sides of the outside of the first rectangular block (11) and the second rectangular block (12).

7. The knee joint prosthesis according to claim 6, characterized in that: The first rectangular block (22) is engaged with the rectangular hole, and the outer side of the first rectangular block (11) contacts the inner side of the second rectangular block (12).

8. The knee joint prosthesis according to claim 1, characterized in that: Circular holes are provided on the outside of the fourth connecting plate (16) and the third connecting plate (15), the second connecting rod (18) is installed in the circular holes, one end of the second spring (19) is installed on the outside of the first connecting plate (13), and the other end of the second spring (19) is installed on the outside of the fourth connecting plate (16).

9. The knee joint prosthesis according to claim 1, characterized in that: Corner ears are installed on both sides of the exterior of the second rectangular block (12), and bolts are provided inside the corner ears, and the bolts are connected to the external threads of the threaded rod (17).

10. The knee joint prosthesis according to claim 1, characterized in that: A plug rod is provided at the bottom of the first rectangular block (11), and the outer diameter of the plug rod is equal to the inner diameter of the connecting cylinder (4).

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