Knee prosthesis and lower limb prosthesis

Abstract

The application provides a knee joint prosthesis and lower limb prosthesis, and relates to the technical field of medical devices. The knee joint prosthesis comprises a knee joint upper body, a knee joint lower body and a hydraulic rod; a biasing pivot is arranged on the knee joint upper body; one end of the hydraulic rod is pivotally connected in the knee joint lower body, and the other end is pivotally connected with the biasing pivot, so that the knee joint upper body can drive the hydraulic rod to extend and retract when the knee joint upper body rotates relative to the knee joint lower body; a pivot hole for mounting a pivot shaft is arranged on the knee joint upper body; a compression slot is arranged on the knee joint upper body and is located above the pivot hole; a connecting head for connecting a patient's leg is arranged on the top of the knee joint upper body; a first threaded connecting hole for mounting the connecting head is arranged on the knee joint upper body; a locking hole is arranged in the first threaded connecting hole and communicates with the pivot hole through the compression slot; a locking clamping column is arranged in the locking hole; and a locking member for limiting the locking clamping column is arranged on the top of the locking hole. The technical effect of improving the stability of the prosthesis is achieved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to knee prostheses and lower limb prostheses. Background Technology

[0002] In today's society, in order to help lower limb amputees regain basic walking function, prostheses are usually installed at the amputation site. At the same time, in order to improve the patient's walking experience, the prosthesis is set with a prosthetic knee joint in the same position as the normal knee joint, so that the patient can achieve flexion and extension functions during walking.

[0003] When using knee prostheses, it is crucial to prevent the prosthesis from bending arbitrarily during the stance phase, as this is key to preventing the user from falling. Furthermore, the stride frequency of the knee prosthesis during the swing phase also plays an important role in the user's walking coordination.

[0004] Existing knee prostheses have drawbacks such as large structural space requirements, unnatural gait for prostheses wearers, and poor stability and / or safety. Summary of the Invention

[0005] The purpose of this invention is to provide a knee joint prosthesis and a lower limb prosthesis to alleviate the technical problem of poor prosthesis stability in the prior art.

[0006] In a first aspect, embodiments of the present invention provide a knee joint prosthesis, comprising an upper knee joint body, a lower knee joint body, and a hydraulic rod;

[0007] The upper body of the knee joint is pivotally connected to the lower body of the knee joint via a pivot shaft;

[0008] An offset pivot is provided on the upper part of the knee joint. One end of the hydraulic rod is pivotally connected to the lower part of the knee joint, and the other end is pivotally connected to the offset pivot, so that when the upper part of the knee joint rotates relative to the lower part of the knee joint, the hydraulic rod can be driven to extend and retract.

[0009] The upper body of the knee joint has a pivot hole for installing the pivot shaft. A compression seam is provided on the upper body of the knee joint, which is located above the pivot hole. A connector for connecting the patient's leg is provided at the top of the upper body of the knee joint. A first threaded connection hole for installing the connector is provided on the upper body of the knee joint. A locking hole is provided in the first threaded connection hole. The locking hole passes through the compression seam and communicates with the pivot hole. A locking pin is provided in the locking hole. The locking pin can abut against the pivot shaft. A locking element for restricting the locking pin is provided at the top of the locking hole.

[0010] In conjunction with the first aspect, the present invention provides a possible implementation of the first aspect, wherein an adjusting bolt is provided on the above-mentioned upper body of the knee joint, the adjusting bolt can be inserted downward from the top of the upper body of the knee joint, the adjusting bolt can be inserted into the compression gap, and when the upper body of the knee joint is not under pressure, the adjusting bolt and the lower surface of the compression gap are left with a gap.

[0011] In conjunction with the first aspect, the present invention provides one possible implementation of the first aspect, wherein the number of the above-mentioned adjusting bolts is multiple, and the multiple adjusting bolts are disposed on the outer periphery of the upper body of the knee joint.

[0012] In conjunction with the first aspect, the present invention provides one possible implementation of the first aspect, wherein the hydraulic rod includes a hydraulic housing, a plunger, a plunger rod, and a cylinder liner;

[0013] The cylinder liner is inserted into the hydraulic housing, the plunger is slidably disposed in the cylinder liner, one end of the plunger rod is fixedly connected to the plunger, and the other end of the plunger rod extends out of the hydraulic housing and is connected to the offset shaft.

[0014] In conjunction with the first aspect, the present invention provides one possible implementation of the first aspect, wherein the hydraulic housing includes a cylinder and a top cover;

[0015] The upper cover is rotatably and sealingly mounted on the cylinder body, and the plunger rod is slidably sealed with the upper cover.

[0016] In conjunction with the first aspect, the present invention provides a possible implementation of the first aspect, wherein a first cavity is formed between the plunger and the cylinder body, a second cavity is formed between the plunger and the upper cover, a third cavity is formed between the plunger and the cylinder liner, and a fourth cavity is formed between the cylinder liner and both the cylinder body and the upper cover;

[0017] The plunger has a first horizontal hole and a first vertical hole. The first horizontal hole is used to connect the third cavity with the first vertical hole. The lower end of the first vertical hole is provided with a first one-way valve for unidirectional flow from the first vertical hole to the first cavity. The upper end of the first vertical hole is provided with a second one-way valve for unidirectional flow from the first vertical hole to the second cavity.

[0018] The cylinder liner has a plurality of second vertical holes for connecting the second cavity and the fourth cavity, and the cylinder liner has a second horizontal hole for connecting the first cavity and the fourth cavity.

[0019] In conjunction with the first aspect, the present invention provides a possible implementation of the first aspect, wherein the bottom inner ring of the above-mentioned upper cover is provided with an inclined annular flow channel, the depth of the inclined annular flow channel gradually increasing from zero;

[0020] The cylinder sidewall has a speed regulating channel for connecting the first cavity and the fourth cavity, and the speed regulating channel corresponds to the inclined annular flow channel.

[0021] In conjunction with the first aspect, the present invention provides a possible implementation of the first aspect, wherein, as the plunger slides down, the plunger is able to block the second horizontal hole so that the second horizontal hole is located in the third cavity.

[0022] In conjunction with the first aspect, the present invention provides one possible implementation of the first aspect, wherein a bearing is provided between the pivot shaft and the pivot hole.

[0023] Secondly, embodiments of the present invention provide a lower limb prosthesis, including the aforementioned knee joint prosthesis.

[0024] Beneficial effects:

[0025] This invention provides a knee joint prosthesis, including an upper knee joint, a lower knee joint, and a hydraulic rod. The upper knee joint is pivotally connected to the lower knee joint via a pivot shaft. An offset pivot is provided on the upper knee joint. One end of the hydraulic rod is pivotally connected to the lower knee joint, and the other end is pivotally connected to the offset pivot shaft, so that the hydraulic rod can extend and retract when the upper knee joint rotates relative to the lower knee joint. A pivot hole for installing the pivot shaft is provided on the upper knee joint. A compression slot is provided on the upper knee joint, located above the pivot hole. A connector for connecting the patient's leg is provided at the top of the upper knee joint. A first threaded connection hole for installing the connector is provided on the upper knee joint. A locking hole is provided in the first threaded connection hole. The locking hole passes through the compression slot and communicates with the pivot hole. A locking pin is provided in the locking hole, which can abut against the pivot shaft. A locking element for limiting the locking pin is provided at the top of the locking hole.

[0026] Specifically, during use, the user attaches the upper knee joint to the end of the thigh via the connector. When walking, as the user steps and the prosthesis touches the ground, the user's thigh presses against the upper knee joint. The part of the upper knee joint above the compression joint is pressed downwards, causing the locking pin to press downwards. The locking pin can press down on the lower pivot, thus preventing the upper knee joint from rotating relative to the lower knee joint. When the user steps with the other leg, the leg with the knee prosthesis will not wobble or swing, improving the stability and safety of the knee prosthesis.

[0027] This invention provides a lower limb prosthesis, including a knee joint prosthesis. The prosthesis has the advantages described above compared to existing technologies, which will not be elaborated further here. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 A schematic diagram of a knee prosthesis provided in an embodiment of the present invention;

[0030] Figure 2 A cross-sectional view of a knee prosthesis provided in an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the hydraulic oil flow during the initial stage of lifting the leg and taking a step in the use of a knee prosthesis, as provided in an embodiment of the present invention.

[0032] Figure 4 This is a schematic diagram of the hydraulic oil flow during the later stage of leg lifting and stepping in the use of a knee prosthesis provided in an embodiment of the present invention.

[0033] Figure 5 This is a schematic diagram of the hydraulic oil flow during the initial stage of lifting the leg and stepping onto the ground when using a knee prosthesis, as provided in an embodiment of the present invention.

[0034] Figure 6 This is a schematic diagram of the hydraulic oil flow during the later stage of leg lifting and landing when using a knee prosthesis according to an embodiment of the present invention.

[0035] Figure 7 for Figure 3 A magnified view of a portion of point A in the middle.

[0036] icon:

[0037] 100 - Upper body of the knee joint; 101 - Pivot hole; 110 - Offset pivot; 120 - Compression joint; 130 - Connector; 140 - Locking pin; 150 - Locking element; 160 - Adjusting bolt;

[0038] 200 - Lower body of the knee joint; 210 - Pivot joint;

[0039] 300-Hydraulic rod; 310-Hydraulic housing; 311-Cylinder body; 312-Top cover; 313-Inclined annular flow channel; 314-Speed ​​regulating channel; 320-Plunger; 321-First horizontal hole; 322-First vertical hole; 330-Plunger rod; 340-Cylinder liner; 341-Second horizontal hole; 342-Second vertical hole;

[0040] 410 - First cavity; 420 - Second cavity; 430 - Third cavity; 440 - Fourth cavity;

[0041] 510 - First check valve; 520 - Second check valve. Detailed Implementation

[0042] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0045] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0047] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, this embodiment provides a knee joint prosthesis, including an upper knee joint body 100, a lower knee joint body 200, and a hydraulic rod 300. The upper knee joint body 100 is pivotally connected to the lower knee joint body 200 via a pivot shaft 210. An offset pivot shaft 110 is provided on the upper knee joint body 100. One end of the hydraulic rod 300 is pivotally connected inside the lower knee joint body 200, and the other end is pivotally connected to the offset pivot shaft 110, so that when the upper knee joint body 100 rotates relative to the lower knee joint body 200, it can drive the hydraulic rod 300 to extend and retract. A pivot hole 10 for mounting the pivot shaft 210 is provided on the upper knee joint body 100. 1. A compression seam 120 is provided on the upper body 100 of the knee joint. The compression seam 120 is located above the pivot hole 101. A connector 130 for connecting the patient's leg is provided at the top of the upper body 100 of the knee joint. A first threaded connection hole for installing the connector 130 is provided on the upper body 100 of the knee joint. A locking hole is provided in the first threaded connection hole. The locking hole passes through the compression seam 120 and communicates with the pivot hole 101. A locking pin 140 is provided in the locking hole. The locking pin 140 can abut against the pivot shaft 210. A locking member 150 for limiting the locking pin 140 is provided at the top of the locking hole.

[0048] Specifically, during use, the user wears the upper knee joint 100 on the end of the thigh through the connector 130. When walking, after the user steps and the prosthesis touches the ground, the user's thigh presses against the upper knee joint 100. The part of the upper knee joint 100 above the compression seam 120 is pressed downward, which causes the locking pin 140 to press downward. The locking pin 140 can press against the lower pivot 210, thus preventing the upper knee joint 100 from rotating relative to the lower knee joint 200. When the user steps with the other leg, the leg with the knee prosthesis will not wobble or swing, improving the stability and safety of the knee prosthesis.

[0049] Among them, the locking component 150 uses a locking screw.

[0050] See Figures 1-7As shown, in an optional embodiment, an adjusting bolt 160 is provided on the upper body 100 of the knee joint. The adjusting bolt 160 can be inserted downward from the top of the upper body 100 of the knee joint and can be inserted into the compression gap 120. When the upper body 100 of the knee joint is not under pressure, there is a gap between the adjusting bolt 160 and the lower surface of the compression gap 120.

[0051] The number of adjusting bolts 160 is multiple, and the multiple adjusting bolts 160 are set on the outer periphery of the upper body 100 of the knee joint.

[0052] Specifically, an adjusting bolt 160 is provided on the upper body 100 of the knee joint, and an adjusting threaded hole is provided on the top of the upper body 100 of the knee joint. The adjusting bolt 160 is installed in the adjusting threaded hole, and one end of the adjusting threaded hole can extend into the compression gap 120. When the upper body 100 of the knee joint is not under pressure, there is a gap between the adjusting bolt 160 and the lower surface of the compression gap 120. When the user walks, after one leg equipped with the knee joint prosthesis has fully landed, when the user steps with the other leg, the user's own weight presses on the connector 130. The connector 130 presses on the top of the upper body 100 of the knee joint, thereby causing the upper part of the compression gap 120 of the upper body 100 of the knee joint to press downward, so that the locking pin 140 in the locking hole tightly presses the pivot shaft 210, so that the pivot shaft 210 cannot rotate, thereby ensuring the stability of the knee joint prosthesis.

[0053] By adjusting the setting of the bolt 160, the clamping force of the locking pin 140 on the pivot shaft 210 can be adjusted according to the user's weight, so that the knee prosthesis can be used for users of different weights to ensure its stability.

[0054] A bearing is provided between the pivot shaft 210 and the pivot hole 101 to ensure the smoothness of the upper part of the knee joint 100 and the lower part of the knee joint 200 when the user steps.

[0055] See Figures 1-7 As shown, in the optional embodiment, the hydraulic rod 300 includes a hydraulic housing 310, a plunger 320, a plunger rod 330, and a cylinder liner 340; the cylinder liner 340 is inserted into the hydraulic housing 310, the plunger 320 is slidably disposed in the cylinder liner 340, one end of the plunger rod 330 is fixedly connected to the plunger 320, and the other end of the plunger rod 330 extends out of the hydraulic housing 310 and is connected to the offset shaft 110.

[0056] The hydraulic housing 310 includes a cylinder body 311 and an upper cover 312; the upper cover 312 is rotatably and sealingly disposed on the cylinder body 311, and the plunger rod 330 slides and seals with the upper cover 312.

[0057] The plunger 320 forms a first cavity 410 with the cylinder body 311, a second cavity 420 with the upper cover 312, a third cavity 430 with the cylinder liner 340, and a fourth cavity 440 between the cylinder liner 340 and both the cylinder body 311 and the upper cover 312. The plunger 320 has a first horizontal hole 321 and a first vertical hole 322. The first horizontal hole 321 connects the third cavity 430 with the first vertical hole 322. The lower end of 22 is provided with a first one-way valve 510 for unidirectional flow from the first vertical hole 322 to the first cavity 410, and the upper end of the first vertical hole 322 is provided with a second one-way valve 520 for unidirectional flow from the first vertical hole 322 to the second cavity 420; the cylinder liner 340 is provided with a plurality of second vertical holes 342 for connecting the second cavity 420 and the fourth cavity 440, and the cylinder liner 340 is provided with a second horizontal hole 341 for connecting the first cavity 410 and the fourth cavity 440.

[0058] The bottom inner ring of the upper cover 312 has an inclined annular flow channel 313, the depth of which gradually increases from zero. The side wall of the cylinder 311 has a speed regulating channel for connecting the first cavity 410 and the fourth cavity 440, which corresponds to the inclined annular flow channel 313. By setting the inclined annular flow channel 313, the flow rate of the liquid discharged from the speed regulating channel can be adjusted, thereby adjusting the extension and retraction rate of the hydraulic rod 300, thus adjusting the rotation speed of both the upper body 100 and the lower body 200 of the knee joint, and consequently adjusting the user's stride. The inclined annular flow channel 313 allows the knee prosthesis to adapt to users of different heights and body types, enabling users to adjust to a stride that suits them.

[0059] When the plunger 320 slides down, the plunger 320 can block the second horizontal hole 341 so that the second horizontal hole 341 is located in the third cavity 430.

[0060] Specifically, when the user lifts the prosthetic limb to take a step, the user lifts the knee prosthesis, the plunger rod 330 extends outward relative to the hydraulic housing 310, and the plunger rod 330 drives the plunger 320 to move upward, see [reference]. Figure 3As shown, at this time, the plunger 320 blocks the second horizontal hole 341 on the cylinder liner 340, and the plunger 320 squeezes the hydraulic oil in the second chamber 420. The hydraulic oil enters the fourth chamber 440 from the second chamber 420 through the second vertical hole 342 of the cylinder liner 340. Then, the hydraulic oil enters the third chamber 430 from the fourth chamber 440 through the second horizontal hole 341 of the cylinder liner 340. Then, the hydraulic oil enters the first vertical hole 322 from the third chamber 430 through the first horizontal hole 321 of the plunger 320. Then, it enters the first chamber 410 through the first check valve 510 provided in the first vertical hole 322. In addition, the hydraulic oil in the fourth chamber 440 can enter the speed regulating channel through the inclined annular flow channel 313, and then enter the first chamber 410 through the speed regulating channel. See also Figure 4 As shown, at this time, the plunger 320 rises to a certain height so that the plunger 320 no longer blocks the second horizontal hole 341 on the cylinder liner 340. The hydraulic oil in the second cavity 420 enters the fourth cavity 440 through the second vertical hole 342 of the cylinder liner 340. Then, the hydraulic oil quickly enters the first cavity 410 from the fourth cavity 440 through the second horizontal hole 341 of the cylinder liner 340. In addition, the hydraulic oil in the fourth cavity 440 can enter the speed regulating channel through the inclined annular flow channel 313, and then enter the first cavity 410 through the speed regulating channel. The above process is the movement of the knee joint prosthesis in the air when the user takes a step and kicks, so that the lower body 200 of the knee joint can rotate relative to the upper body 100 of the knee joint.

[0061] Then, see Figure 5 As shown, when the affected limb wearing the knee prosthesis lands, the plunger rod 330 retracts inward relative to the hydraulic housing 310, and the plunger rod 330 drives the plunger 320 to move downward. At this time, the plunger 320 does not block the second horizontal hole 341 on the cylinder liner 340. The plunger 320 squeezes the hydraulic oil in the first chamber 410, and the hydraulic oil enters the fourth chamber 440 from the first chamber 410 through the second horizontal hole 341 of the cylinder liner 340. Then, the hydraulic oil quickly enters the second chamber 420 from the fourth chamber 440 through the second vertical hole 342 of the cylinder liner 340. In addition, the hydraulic oil in the first chamber 410 can enter the inclined annular flow channel 313 from the speed regulating channel, and then enter the second chamber 420 through the second vertical hole 342 of the cylinder liner 340. See also Figure 6As shown, at this time, the plunger 320 descends to a certain height, causing the plunger 320 to block the second horizontal hole 341 on the cylinder liner 340. This allows the hydraulic oil in the first chamber 410 to enter the inclined annular flow channel 313 through the speed regulating channel, and then flow from the inclined annular flow channel 313 into the fourth chamber 440. Then, it quickly enters the third chamber 430 from the fourth chamber 440 through the second horizontal hole 341 of the cylinder liner 340, and then enters the second chamber 420 from the third chamber 430 through the second one-way valve 520. The above process is the entire process of the knee prosthesis contacting the support on the ground after the user takes a step and kicks, allowing the prosthesis to swing smoothly. Then, when the user steps firmly, the user's weight presses on the connector 130, and then the compression seam 120 presses the locking pin 140, so that the locking pin 140 tightly presses the pivot shaft 210, ensuring that the upper body 100 and the lower body 200 of the knee joint are relatively fixed, thus improving the stability of the knee prosthesis. In addition, users can rotate the cylinder 311 and the top cover 312 to make the speed regulating channel correspond to different positions of the inclined annular flow channel 313, thereby adjusting the flow rate of hydraulic oil, thereby adjusting the swing angular velocity of the upper body 100 and the lower body 200 of the knee joint, and thus adjusting the stride.

[0062] This embodiment provides a lower limb prosthesis, including a knee joint prosthesis.

[0063] Specifically, the lower limb prosthesis provided in this embodiment has the advantages mentioned above compared with the prior art, which will not be repeated here.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A knee joint prosthesis, characterized in that, include: Upper knee joint (100), lower knee joint (200), and hydraulic rod (300); The upper part of the knee joint (100) is pivotally connected to the lower part of the knee joint (200) via a pivot shaft (210); An offset pivot (110) is provided on the upper body (100) of the knee joint. One end of the hydraulic rod (300) is pivotally connected to the lower body (200) of the knee joint, and the other end is pivotally connected to the offset pivot (110), so that when the upper body (100) of the knee joint rotates relative to the lower body (200) of the knee joint, the hydraulic rod (300) can be driven to extend and retract. The upper body of the knee joint (100) has a pivot hole (101) for installing the pivot shaft (210). A compression joint (120) is provided on the upper body of the knee joint (100), located above the pivot hole (101). A connector (130) for connecting to the patient's leg is provided at the top of the upper body of the knee joint (100). A first threaded connection hole is provided on the upper body of the knee joint (100) for installing the connector (130). A locking hole is provided in the threaded connection hole. The locking hole passes through the compression joint (120) and communicates with the pivot hole (101). A locking pin (140) is provided in the locking hole. The locking pin (140) can abut against the pivot shaft (210). A locking member (150) for limiting the locking pin (140) is provided at the top of the locking hole. When the upper body of the knee joint (100) is not under pressure, the locking pin (140) can move relative to the pivot shaft (210).

2. The knee prosthesis according to claim 1, characterized in that, An adjusting bolt (160) is provided on the upper part of the knee joint (100). The adjusting bolt (160) can be inserted downward from the top of the upper part of the knee joint (100). The adjusting bolt (160) can be inserted into the compression gap (120). When the upper part of the knee joint (100) is not under pressure, there is a gap between the adjusting bolt (160) and the lower surface of the compression gap (120).

3. The knee prosthesis according to claim 2, characterized in that, The number of the adjusting bolts (160) is multiple, and the multiple adjusting bolts (160) are disposed on the outer periphery of the upper body (100) of the knee joint.

4. The knee prosthesis according to claim 1, characterized in that, The hydraulic rod (300) includes a hydraulic housing (310), a plunger (320), a plunger rod (330), and a cylinder liner (340). The cylinder liner (340) is inserted into the hydraulic housing (310), the plunger (320) is slidably disposed in the cylinder liner (340), one end of the plunger rod (330) is fixedly connected to the plunger (320), and the other end of the plunger rod (330) extends out of the hydraulic housing (310) and is connected to the offset shaft (110).

5. The knee prosthesis according to claim 4, characterized in that, The hydraulic housing (310) includes a cylinder (311) and a top cover (312). The upper cover (312) is rotatably and sealingly disposed on the cylinder body (311), and the plunger rod (330) slides and seals with the upper cover (312).

6. The knee prosthesis according to claim 5, characterized in that, A first cavity (410) is formed between the plunger (320) and the cylinder (311), a second cavity (420) is formed between the plunger (320) and the upper cover (312), a third cavity (430) is formed between the plunger (320) and the cylinder liner (340), and a fourth cavity (440) is formed between the cylinder liner (340) and both the cylinder (311) and the upper cover (312). The plunger (320) is provided with a first horizontal hole (321) and a first vertical hole (322). The first horizontal hole (321) is used to connect the third cavity (430) and the first vertical hole (322). The lower end of the first vertical hole (322) is provided with a first one-way valve (510) for unidirectional flow from the first vertical hole (322) to the first cavity (410). The upper end of the first vertical hole (322) is provided with a second one-way valve (520) for unidirectional flow from the first vertical hole (322) to the second cavity (420). The cylinder liner (340) has a plurality of second vertical holes (342) for connecting the second cavity (420) and the fourth cavity (440), and the cylinder liner (340) has a second horizontal hole (341) for connecting the first cavity (410) and the fourth cavity (440).

7. The knee prosthesis according to claim 6, characterized in that, The bottom inner ring of the top cover (312) is provided with an inclined annular flow channel (313), the depth of which gradually increases from zero; The cylinder body (311) has a speed regulating channel on its side wall for connecting the first cavity (410) and the fourth cavity (440), and the speed regulating channel corresponds to the inclined annular flow channel (313).

8. The knee prosthesis according to claim 7, characterized in that, As the plunger (320) slides down, the plunger (320) can block the second horizontal hole (341) so that the second horizontal hole (341) is located within the third cavity (430).

9. The knee prosthesis according to any one of claims 1-8, characterized in that, A bearing is provided between the pivot shaft (210) and the pivot hole (101).

10. A lower limb prosthesis, characterized in that, Includes the knee prosthesis as described in any one of claims 1-9.

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