CN219323544U - Knee joint prosthesis system for animals - Google Patents

Abstract

The utility model discloses a knee joint prosthesis system for animals, which comprises a femur component, a liner and a tibia component, wherein the femur component, the liner and the tibia component are sequentially arranged from top to bottom, the femur component is crescent-shaped in a right view, one side far away from the center of the femur component is taken as the outer side, the outer side surface of the femur component is taken as a movable surface, the upper surface of the liner is sunken to form a supporting surface, the supporting surface is provided with two supporting surfaces which are bilaterally symmetrical relative to the liner, the movable surface is connected with the supporting surface in an adapting way, the femur component can roll relative to the supporting surface, the liner and the tibia component are heart-shaped in a overlooking view, and the tibia component is connected with the liner. The femoral component can be connected with the resected femoral surface, the tibial component can be better matched with the resected tibial surface, and the liner is positioned between the femoral component and the tibial component to play a role in connection so that the femoral component and the tibial component are combined into a knee joint prosthesis system, and the femur and the tibia of an animal are connected, thereby ensuring that the animal can recover good activity function after the knee joint prosthesis system is installed.

Description

Knee joint prosthesis system for animals

Technical Field

The utility model relates to the technical field of animal orthopaedics prostheses, in particular to a knee joint prosthesis system for animals.

Background

Artificial total knee arthroplasty is the primary means of treating severe knee joint disorders, relieving knee joint pain, and reestablishing knee joint function. In the field of human medicine, knee joint replacement surgery is complete, and a large number of people perform knee joint replacement surgery every day, so that pain caused by inflammatory hyperplasia and bony spur necrosis of the knee joints of people is reduced. However, the technology for carrying out artificial knee joint surgery is not very perfect for the veterinary technical field, and particularly in China, an animal artificial knee joint prosthesis which is independently developed is still lacking.

The most common conditions requiring knee replacement surgery in small animals to date are chronic knee arthritis and degenerative joint disease due to anterior cruciate ligament injury, and a variety of conditions including osteochondrosis, joint fractures, patellar dislocation, chronic infections, collateral ligament injury, distal femur and proximal tibia deformity, and the like. Especially for animals such as cats and dogs, the fracture of long bones of limbs is very easy to occur due to their physiological characteristics and their very loving movements due to falling, being bumped or stepped on, and these external factors deteriorate the integrity and continuity of bones accompanied by injury of surrounding tissues, and fixation or bone replacement implantation operations, particularly at knee joint sites, are required, so that the development of artificial knee joint prosthesis systems for animals is very necessary and urgent in view of increasing market demands.

Disclosure of Invention

The present utility model is directed to a knee prosthesis system for animals that addresses one or more of the problems of the prior art.

The technical scheme adopted for solving the technical problems is as follows:

the utility model discloses a knee joint prosthesis system for animals, which comprises a femur component, a liner and a tibia component, wherein the femur component, the liner and the tibia component are sequentially arranged from top to bottom, the femur component is crescent-shaped and takes one side far away from the center of the femur component as the outer side in a right view, the outer side of the femur component is a movable surface, the upper surface of the liner is sunken to form a supporting surface, two supporting surfaces are arranged and are bilaterally symmetrical relative to the liner, the movable surface is connected with the supporting surface in an adapting way, the femur component can roll relative to the supporting surface, the liner and the tibia component are heart-shaped in a overlooking view, and the tibia component is connected with the liner.

The utility model has at least the following beneficial effects: the femur component is crescent, the inner side surface of the femur component can be well connected with the resected knee joint femur surface of the animal, the femur component is arranged above the liner, the movable surface of the femur component can be matched with the supporting surface of the liner, the femur component can roll on the supporting surface, so that the knee joint femur of the animal can smoothly and stably move relative to the knee joint tibia, and the liner provides a movable space and a bearing function for the femur component; the tibia component is heart-shaped, the tibia component is fixed on the tibia of an animal, the resected knee joint tibia surface of the animal can be better matched, the liner is arranged above the tibia component, the liner is connected with the tibia component, and the liner is heart-shaped and matched with the tibia component, so that the femur component, the liner and the tibia component are combined into a knee joint prosthesis system, the knee joint femur and the knee joint tibia of the animal are effectively connected, and the animal can be guaranteed to recover good activity function after the knee joint prosthesis system is installed.

As a further improvement of the technical scheme, from the overlooking view, the front side surface of the liner and the front side surface of the tibia component are arc-shaped concave surfaces, a first limiting block and a second limiting block are formed on the upper surface of the tibia component in a protruding mode, the first limiting block is located on the front side of the tibia component, the second limiting block is located on the rear side of the tibia component, the front side surface of the liner is connected with the inner side surface of the first limiting block, and the rear side surface of the liner is connected with the inner side surface of the second limiting block.

The front side of liner and the front side of shin bone part adopt the arc concave surface, and liner and shin bone part outer peripheral face are smooth not to have the edges and corners, can better suit with the knee joint of animal, and the upper surface of shin bone part sets up first stopper and second stopper, and first stopper and second stopper are the relative setting around being, are being connected the back with shin bone part at the liner, and first stopper and second stopper play spacing effect to the liner, prevent that the liner from taking place circumferential displacement to increase the firm stability of this knee joint prosthesis system after implanting the animal in vivo.

As a further improvement of the technical scheme, the upper surface of the tibia component is provided with a clamping column, the lower surface of the liner is concavely provided with a clamping groove, and the clamping column is in clamping connection with the clamping groove. The tibia component is provided with the clamping post, the liner is provided with the clamping groove, after the clamping post is inserted into the clamping groove, the tibia component and the liner are caused to produce a buckling connection effect, the tibia component is caused to apply an axial self-locking fixing effect to the liner, the liner is prevented from moving upwards relative to the tibia component, the femur component, the liner and the tibia component are ensured to be in an effective connection state, and the working stability of the knee joint prosthesis system is improved.

As the further improvement of above-mentioned technical scheme, the joint post is umbrella form, the joint post has the center pin that extends along upper and lower direction, the joint post includes the lamellar body, the lamellar body is equipped with a plurality of and around center pin circumference sets up, and adjacent two have the interval between the lamellar body, the joint groove is the recess that is umbrella form.

The plurality of sheet bodies are circumferentially distributed around the central axis of the clamping column to form an umbrella-shaped clamping column, a certain gap exists between two adjacent sheet bodies, and in the process that the clamping column is inserted into the clamping groove, the sheet bodies are subjected to extrusion force exerted by the wall surface of the clamping groove to swing towards the central axis direction, so that the clamping column can be smoothly inserted into the clamping groove; the clamping groove is an umbrella-shaped groove, when the clamping column moves in place, the sheet body is reset due to the fact that the extrusion force applied to the sheet body is removed, so that the clamping column can be well clamped in the clamping groove, and the gasket is ensured to be fixed with the tibia component; by the design, the pad can be accurately and conveniently mounted on the tibia component, and long-term implantation stability of the knee joint prosthesis system can be ensured.

As a further improvement of the technical scheme, the inner side surface of the femoral component is provided with a fixed column, the axis of the fixed column extends along the front-back direction, the lower surface of the tibial component is provided with a connecting column, the axis of the connecting column extends along the up-down direction, and the inner side surface of the femoral component, the outer surface of the fixed column, the lower surface of the tibial component and the outer surface of the connecting column are of porous structures.

The femoral component sets up the fixed column, the fixed column is located the medial surface of femoral component, the femoral component inserts in order to realize that it is fixed mutually with the femur through the fixed column in the femur of animal, the tibial component sets up the spliced pole, the spliced pole is located the lower surface of tibial component, the tibial component inserts in order to realize that it is fixed mutually with the tibia through the spliced pole in the tibia of animal, moreover, in femoral component and fixed column, their surface that contacts with the femur is established as porous structure, in tibial component and spliced pole, their surface that contacts with the tibia is established as porous structure, porous structure can realize quick bone ingrowth and avoid stress shielding effect, avoid using bone cement to cause a series of minus effect for the animal.

As the further improvement of above-mentioned technical scheme, the fixed column includes a first fixed column and two second fixed columns, first fixed column is located the top of second fixed column, two the second fixed column is with regard to first fixed column bilateral symmetry, the spliced pole includes a first spliced pole and two second spliced poles, first spliced pole is located the front side of second spliced pole, two the second spliced pole is with regard to first spliced pole bilateral symmetry.

The first fixing column mainly plays a role in connecting the femoral component to the knee joint femur of the animal, the two second fixing columns are symmetrically arranged on the left side and the right side of the first fixing column, and the second fixing columns are inserted into the knee joint femur of the animal, so that a certain connecting effect is achieved, and the problem that the femoral component rotates relative to the knee joint femur when being connected close to one first fixing column is avoided; likewise, the first connecting column plays a role in mounting the tibial component on the knee joint tibia, the two second connecting columns are symmetrically arranged on the left side and the right side of the first connecting column, the second connecting columns not only play a certain role in connection, but also effectively avoid the tibial component from rotating relative to the knee joint tibia when depending on one first connecting column.

As a further improvement of the technical scheme, the fixing column and the connecting column are cylindrical, a first guide part is arranged at one end part of the fixing column, which is far away from the femoral component, and a second guide part is arranged at one end part of the connecting column, which is far away from the tibial component. The fixing column and the connecting column are designed by adopting a cylinder, so that connecting holes formed in the femur and the tibia of an animal are round holes, and the problem that the connection between the femur component and the tibia component is unstable due to the fact that cracks appear in the connecting holes due to stress concentration is avoided; the fixed column is provided with a first guide part, and the connecting column is provided with a second guide part, so that the fixed column and the connecting column are easier to be embedded into a marrow expanding hole formed in the knee joint of an animal.

As a further improvement of the above technical solution, the femoral component is provided with two clamping grooves, which are respectively located on the left side surface and the right side surface of the femoral component. The left side face and the right side face of the femoral component are provided with clamping grooves, so that an auxiliary tool can be conveniently used for clamping the clamping grooves, and the femoral component can be stably implanted into an animal body.

As a further improvement of the above technical solution, the medial surface of the femoral component includes a first contact surface, a second contact surface, a third contact surface and a fourth contact surface, the first contact surface, the second contact surface, the third contact surface and the fourth contact surface are sequentially disposed and connected from bottom to top, the second contact surface extends in the vertical direction, an included angle formed by the first contact surface and the second contact surface ranges from 80 ° to 110 °, an included angle formed by the third contact surface and the second contact surface ranges from 120 ° to 160 °, and an included angle formed by the fourth contact surface and the third contact surface ranges from 120 ° to 160 °.

The first contact surface, the second contact surface, the third contact surface and the fourth contact surface form a certain included angle with each other, and the first contact surface, the second contact surface, the third contact surface and the fourth contact surface form an inner side surface of the femoral component together, and the inner side surface of the femoral component adopts the special-shaped structure, so that the mechanical property of the femoral component can be improved, and the femoral component can be better and tightly attached to the resected femoral surface of an animal through the four contact surfaces.

As a further improvement of the technical scheme, the femur component and the tibia component are made of one of cobalt-chromium alloy parts, stainless steel parts and titanium alloy parts, and the gasket is made of high-molecular polyethylene. The femur component and the tibia component adopt cobalt-chromium alloy components, stainless steel components or titanium alloy components, the liner adopts high polymer polyethylene components, and the liner is positioned between the femur component and the tibia component, so that the friction coefficient of the knee joint prosthesis system can be effectively reduced, the wear resistance of the knee joint prosthesis system can be improved, and the mobility of the knee joint prosthesis system after implantation can be improved.

Drawings

The utility model is further described below with reference to the drawings and examples;

FIG. 1 is an exploded view of a construction of a knee prosthesis system for animals according to an embodiment of the present utility model;

FIG. 2 is a perspective view of a knee prosthesis system for animals according to an embodiment of the present utility model;

FIG. 3 is a right side view of an animal knee prosthesis system provided in accordance with an embodiment of the present utility model;

FIG. 4 is a structural perspective view of a femoral component provided in an embodiment of the present utility model;

FIG. 5 is a perspective view of a configuration of a femoral component provided in an embodiment of the present utility model at another viewing angle;

FIG. 6 is a perspective view of a gasket provided by an embodiment of the present utility model;

FIG. 7 is a perspective view of a gasket according to an embodiment of the present utility model from another perspective;

fig. 8 is a structural perspective view of a tibial component provided in an embodiment of the present utility model;

fig. 9 is a perspective view of a tibia component from another perspective provided in an embodiment of the present utility model.

The figures are marked as follows: 100. a femoral component; 110. a femoral component body; 111. a first contact surface; 112. a second contact surface; 113. a third contact surface; 114. a fourth contact surface; 120. a first fixing column; 130. a second fixing column; 140. a clamping groove; 150. a slot; 160. a pulley groove; 200. a gasket; 210. a support surface; 220. a rear side; 230. a front side; 240. a clamping groove; 300. a tibial component; 310. a tibial component body; 320. a first connection post; 330. a second connection post; 340. a first limiting block; 350. a second limiting block; 360. and (5) clamping the column.

Detailed Description

Reference will now be made in detail to the present embodiments of the present utility model, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present utility model, but not to limit the scope of the present utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, if there is a word description such as "a plurality" or the like, the meaning of the plurality is one or more, the meaning of the plurality is two or more, and greater than, less than, exceeding, etc. are understood to exclude the present number, and above, below, within, etc. are understood to include the present number. The description of first, second, and third is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of technical features indicated.

In the drawings, the X direction is from the rear side to the front side of the knee joint prosthesis system for animals, the Y direction is from the left side to the right side of the knee joint prosthesis system for animals, and the Z direction is from the lower side to the upper side of the knee joint prosthesis system for animals.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

Referring to fig. 1 to 9, several embodiments of the knee prosthesis system for animals according to the present utility model are described below.

As shown in fig. 1 to 3, a first embodiment of the present utility model provides a knee prosthesis system for animals, which includes a femoral component 100, a liner 200, and a tibial component 300, wherein the femoral component 100, the liner 200, and the tibial component 300 are sequentially disposed from top to bottom.

The femoral component 100 and the tibial component 300 are made of one of cobalt chrome alloy, stainless steel and titanium alloy, preferably, the femoral component 100 is made of one of CoCrMo alloy, 316L stainless steel and TC4 titanium alloy, and the tibial component 300 is made of one of TC4 titanium alloy, 316L stainless steel and CoCrMo alloy. The liner 200 is a polymeric polyethylene article. The spacer 200 is positioned between the femoral component 100 and the tibial component 300, and is made of the above materials, which can effectively reduce the friction coefficient of the knee prosthesis system, improve the wear resistance of the knee prosthesis system, and improve the mobility of the knee prosthesis system after implantation.

As shown in fig. 1 to 5, from the right view, the femoral component 100 is crescent-shaped, taking a side far from the center of the femoral component 100 as the outer side, the outer side of the femoral component 100 as the movable surface, the movable surface as the cambered surface, and the inner side of the femoral component 100 as the connecting surface, wherein the connecting surface is used for connecting with the resected femoral surface of the animal.

Specifically, the medial side of the femoral component 100 includes a first contact surface 111, a second contact surface 112, a third contact surface 113, and a fourth contact surface 114. The first contact surface 111, the second contact surface 112, the third contact surface 113 and the fourth contact surface 114 are sequentially arranged from bottom to top, and are connected to form a concave inner side surface, and the first contact surface 111, the second contact surface 112, the third contact surface 113 and the fourth contact surface 114 are all planes.

The second contact surface 112 extends in the vertical direction, that is, the second contact surface 112 is a vertical surface, and the first contact surface 111 and the second contact surface 112 form an included angle ranging from 80 ° to 110 °, preferably from 90 ° to 100 °. The third contact surface 113 and the second contact surface 112 form an angle ranging from 120 ° to 160 °, preferably from 130 ° to 140 °. The fourth contact surface 114 and the third contact surface 113 form an angle ranging from 120 ° to 160 °, preferably 130 ° to 140 °.

The first contact surface 111, the second contact surface 112, the third contact surface 113 and the fourth contact surface 114 form a certain included angle with each other, and form the inner side surface of the femoral component 100 together, and the inner side surface of the femoral component 100 adopts such a special-shaped structure, so that the mechanical property of the femoral component 100 can be improved, and the femoral component 100 can be better closely attached to the resected femoral surface of an animal through the four contact surfaces.

The inner side of the femoral component 100 is provided with a fixation post, the axis of which extends in the anterior-posterior direction. The fixing column can be a cylinder, and then a cylindrical connecting hole is drilled on the surface of the femur of the animal, so that the problem that the connection between the femur component 100 and the surface of the femur is unstable due to the occurrence of cracks at the connecting hole caused by stress concentration is avoided. One end (i.e., the posterior end) of the fixation post remote from the femoral component 100 is provided with a first guide portion that is hemispherical and configured to facilitate insertion of the fixation post into a connecting hole formed in the femoral surface of the knee joint of the animal.

In this embodiment, the femoral component 100 includes a femoral component body 110 and a fixing post, the outer contour of the femoral component body 110 is in an arc crescent shape, the outer side surface of the femoral component body 110 is provided with a pulley groove 160, the pulley groove 160 extends upwards from the middle position of the femoral component body 110, the femoral component body 110 is provided with a slot 150, the slot 150 penetrates through the inner side surface and the outer side surface of the femoral component body 110, and the slot 150 extends downwards from the middle position of the femoral component body 110.

The fixation post is integrally formed with the femoral component body 110. The fixing columns include a first fixing column 120 and a second fixing column 130, the first fixing column 120 is located above the second fixing column 130, the first fixing column 120 is provided with one fixing column, the first fixing column 120 can be located at the middle position of the femoral component body 110, and the front end surface of the first fixing column 120 is connected with the second contact surface 112 and the third contact surface 113. The second fixing columns 130 are two, the diameter of the second fixing columns 130 is smaller than that of the first fixing columns 120, the length of the second fixing columns 130 is shorter than that of the first fixing columns 120, the two second fixing columns 130 are bilaterally symmetrical to the first fixing columns 120, and the front end faces of the second fixing columns 130 are connected with the second contact faces 112.

The first fixing post 120 mainly plays a role in connecting the femoral component body 110 to the knee femur of an animal, and the second fixing post 130 plays a certain role in connection after being inserted into the knee femur of an animal, and avoids the problem that the femoral component body 110 rotates relative to the knee femur when being connected close to one first fixing post 120; the two second fixing posts 130 are symmetrically disposed on the left and right sides of the first fixing post 120, so as to promote the femoral component body 110 to be uniformly stressed in the left-right direction.

In some embodiments, the femoral component 100 is provided with a clamping groove 140, the clamping groove 140 is provided in two and symmetrically located on the left and right sides of the femoral component 100, and the clamping groove 140 may be circular or elongated from a right perspective. The provision of the clamping groove 140 facilitates the operator's use of an auxiliary tool, such as a hand-held clamp, to apply a clamping action to the clamping groove 140 to stabilize the femoral component 100 in a corresponding position within the animal.

As shown in fig. 1 to 3, 6 and 7, the upper surface of the pad 200 is recessed to form two support surfaces 210, the two support surfaces 210 are bilaterally symmetrical with respect to the pad 200, the portion of the pad 200 between the two support surfaces 210 is convex, and the convex is in transitional connection with the two support surfaces 210.

The active surface of the femoral component 100 is adapted to couple with the bearing surface 210 such that the femoral component 100 is rotatable about an axis extending laterally relative to the bearing surface 210, and the active surface of the femoral component 100 remains in contact with the bearing surface 210 throughout rotation of the femoral component 100. The spacer 200 provides play and weight bearing to the femoral component 100 to promote smooth and steady movement of the animal's knee femur relative to the knee tibia.

As shown in fig. 6 to 9, the insert 200 and the tibial component 300 are heart-shaped in plan view, and the tibial component 300 is coupled to the insert 200, for example, by screws.

Specifically, the upper surface of the tibia component 300 is provided with two or three or more clamping columns 360, and the clamping columns 360 and the tibia component 300 are integrally formed. The lower surface of the liner 200 is concavely formed with a clamping groove 240, the clamping columns 360 are arranged in one-to-one correspondence with the clamping groove 240, and after the clamping columns 360 are in snap connection with the clamping grooves 240, the liner 200 is fixed with the tibia component 300.

In this embodiment, the clamping column 360 is umbrella-shaped, that is, the clamping column 360 includes a cylindrical portion and a circular truncated cone portion, the cylindrical portion is located below the circular truncated cone portion, and the cylindrical portion is connected with the circular truncated cone portion. The clamping column 360 has a central axis extending in the up-down direction, and the clamping column 360 includes a sheet body provided with a plurality of sheets, such as five, six, and so on. The plurality of sheets are circumferentially arranged around the central axis, so that umbrella-shaped clamping columns 360 can be formed, and a space, such as 1 millimeter, is formed between two adjacent sheets, and the clamping grooves 240 are matched with the clamping columns 360, so that the clamping grooves 240 are umbrella-shaped grooves.

In the process of inserting the clamping post 360 into the clamping groove 240, all the sheet bodies are subjected to the extrusion force exerted by the wall surface of the clamping groove 240 and swing towards the central axis direction (i.e. approach inwards), so that the clamping post 360 is deformed and can be smoothly inserted into the clamping groove 240. After the clamping post 360 moves into place, the sheet body is restored to its original shape (i.e., reset) due to the compression action of the sheet body, so that the clamping post 360 is enabled to be well clamped in the clamping groove 240, and the fixation of the liner 200 and the tibial component 300 is ensured. By adopting the design, the pad 200 can be accurately and conveniently installed on the tibia component 300, and the upward movement of the pad 200 relative to the tibia component 300 is avoided, so that the pad 200 is prevented from being separated from the tibia component 300 after implantation, and the long-term implantation stability of the knee joint prosthesis system is ensured.

The lower surface of the tibial component 300 is provided with a connecting post, and the axis of the connecting post extends in the up-down direction. In this embodiment, the tibial component 300 includes a tibial component body 310 and a connecting post, the tibial component body 310 being heart-shaped, the tibial component body 310 better matching the resected surface of the knee tibia of an animal relative to a meniscus-shaped prosthesis applied to a human. The connecting column can be a cylinder or a conical body, and adopts a cylinder design, so that the connecting hole formed in the tibia of the animal is a round hole or a conical hole, and the problem that the connecting hole is not stable enough due to the occurrence of cracks caused by stress concentration is avoided, and the problem that the connection of the tibia component 300 is not stable enough is solved.

One end (i.e., the lower end) of the connecting post, which is remote from the tibial component 300, is provided with a second guide portion that is hemispherical and configured to facilitate insertion of the connecting post into a reaming hole formed in the knee joint of the animal.

The connecting post is located below the tibial component body 310 and is integrally formed with the tibial component body 310. The connecting post includes a first connecting post 320 and a second connecting post 330, the first connecting post 320 is located at the front side of the second connecting post 330, the first connecting post 320 is provided with one, the first connecting post 320 can be located at the middle position of the tibial component body 310, the second connecting post 330 is provided with two, the diameter of the second connecting post 330 is smaller than that of the first connecting post 320, the length is shorter than that of the first connecting post 320, and the two second connecting posts 330 are bilaterally symmetrical with respect to the first connecting post 320.

The first connecting post 320 serves to mount the tibial component body 310 to the knee tibia, and the second connecting post 330 not only serves to connect the tibial component body 310 to the knee tibia, but also effectively prevents the tibial component body 310 from rotating relative to the knee tibia when relying on one first connecting post 320.

In some embodiments, the anterior side 230 of the insert 200 and the anterior side of the tibial component 300 are arcuate concave in plan view, the anterior side 230 of the insert 200 is rounded in transition with the left and right sides thereof, and the posterior side 220 of the insert 200 is also arcuate concave and rounded in transition with the left and right sides of the insert 200. The anterior aspect of tibial component 300 is rounded with its left and right sides. The outer peripheral surfaces of the liner 200 and the tibial component 300 are smooth and non-angular, and can better adapt to and mate with the knee joint of an animal.

In addition, a first stopper 340 and a second stopper 350 are formed on the upper surface of the tibial component 300 in a protruding manner, the first stopper 340 is located on the front side of the tibial component 300, the second stopper 350 is located on the rear side of the tibial component 300, and the first stopper 340 and the second stopper 350 are disposed in a front-rear opposite manner.

After the liner 200 is connected to the tibial component 300, the anterior side 230 of the liner 200 contacts the medial side of the first stop 340 and the posterior side 220 of the liner 200 contacts the medial side of the second stop 350, such that the liner 200 cannot move in the anterior-posterior and lateral directions relative to the tibial component 300. The first stopper 340 and the second stopper 350 perform a better stopper function on the spacer 200, prevent the spacer 200 from being circumferentially displaced, and further strengthen the connectivity between the spacer 200 and the tibial component 300, thereby increasing the firm stability of the knee prosthesis system after implantation in an animal.

In some embodiments, the medial side of the femoral component 100, the outer surface of the fixation post, the inferior surface of the tibial component 300, and the outer surface of the connecting post are porous structures, and may have a pore size of 0.2mm to 0.8mm and a porosity of 30% to 80%.

In this embodiment, the medial side of the femoral component 100 and the outer surface of the fixation post are biomimetic porous surface layers, as are the inferior surface of the tibial component 300 and the outer surface of the connecting post. The porous structure provides better space and environment for proliferation and growth of bone cells, effectively reduces the elastic modulus of the knee joint prosthesis system, can ensure stability, improves implantation compatibility, can reduce or avoid adverse reaction caused by rejection with real bone tissues after implantation of the knee joint prosthesis system, and can also avoid side effects caused by using bone cement to animals.

In the knee prosthesis system provided by the embodiment of the utility model, the inner side surface of the femur component 100 in a crescent shape can be well connected with the resected knee femur surface of an animal, the femur component 100 is above the liner 200, the movable surface of the femur component 100 can be matched with the supporting surface 210 of the liner 200, so that the femur component 100 can roll on the supporting surface 210, and the knee femur of the animal can smoothly and stably move relative to the knee tibia. The heart-shaped tibial component 300 is secured to the animal's tibia to better match the resected knee tibial surface of the animal. The spacer 200 is heart-shaped and is mated and secured to the tibial component 300, facilitating the combination of the femoral component 100, spacer 200 and tibial component 300 into a knee prosthesis system that effectively connects the animal's knee femur and knee tibia, thereby ensuring that the animal can resume good mobility after installation of the knee prosthesis system. The knee joint prosthesis system has reasonable structure and easy manufacture, is very suitable for popularization and application in animal orthopaedics, can improve the current situation that the existing pet medical instrument is insufficient, and promotes the development of the industry of the pet medical instrument.

While the preferred embodiments of the present utility model have been illustrated and described, the present utility model is not limited to the embodiments, and various equivalent modifications and substitutions can be made by one skilled in the art without departing from the spirit of the present utility model, and these are intended to be included in the scope of the present utility model as defined in the appended claims.

Claims (10)

1. The utility model provides a knee joint prosthesis system for animal, its characterized in that includes femoral component (100), liner (200) and shin bone part (300), femoral component (100) liner (200) with shin bone part (300) are from top to bottom set gradually, from the right side view, femoral component (100) are crescent, with the side of keeping away from femoral component (100) center is the outside, the lateral surface of femoral component (100) is the movable surface, the upper surface of liner (200) is sunken to form holding surface (210), holding surface (210) are equipped with two and about liner (200) bilateral symmetry, the movable surface with holding surface (210) adaptation is connected and femoral component (100) can roll relative holding surface (210), liner (200) and shin bone part (300) are heart-shaped from the top view, tibial component (300) are connected with liner (200).

2. The knee prosthesis system for animals according to claim 1, wherein the anterior side of the liner (200) and the anterior side of the tibial component (300) are arc-shaped concave surfaces in a plan view, a first stopper (340) and a second stopper (350) are formed to protrude from the upper surface of the tibial component (300), the first stopper (340) is located on the anterior side of the tibial component (300), the second stopper (350) is located on the posterior side of the tibial component (300), the anterior side of the liner (200) is connected to the inner side of the first stopper (340), and the posterior side of the liner (200) is connected to the inner side of the second stopper (350).

3. The knee prosthesis system for animals according to claim 2, wherein the upper surface of the tibial component (300) is provided with a clamping post (360), the lower surface of the liner (200) is concavely formed with a clamping groove (240), and the clamping post (360) is in snap connection with the clamping groove (240).

4. A knee prosthesis system for animals according to claim 3, wherein the locking post (360) is umbrella-shaped, the locking post (360) has a central axis extending in an up-down direction, the locking post (360) comprises a plurality of pieces circumferentially arranged around the central axis, a space is provided between two adjacent pieces, and the locking groove (240) is an umbrella-shaped groove.

5. The knee prosthesis system for animals according to claim 1, wherein the inner side of the femoral component (100) is provided with a fixing post, an axis of the fixing post is extended in the anterior-posterior direction, the lower surface of the tibial component (300) is provided with a connecting post, an axis of the connecting post is extended in the up-down direction, and the inner side of the femoral component (100), the outer surface of the fixing post, the lower surface of the tibial component (300), and the outer surface of the connecting post are porous structures.

6. The knee prosthesis system for animals according to claim 5, wherein the fixing post comprises a first fixing post (120) and two second fixing posts (130), the first fixing post (120) is located above the second fixing post (130), the two second fixing posts (130) are bilaterally symmetrical with respect to the first fixing post (120), the connecting post comprises a first connecting post (320) and two second connecting posts (330), the first connecting post (320) is located at the front side of the second connecting post (330), and the two second connecting posts (330) are bilaterally symmetrical with respect to the first connecting post (320).

7. The knee prosthesis system for animals according to claim 5 or 6, wherein the fixation post and the connection post are cylindrical, the end of the fixation post remote from the femoral component (100) is provided with a first guide, and the end of the connection post remote from the tibial component (300) is provided with a second guide.

8. The knee prosthesis system for animals according to claim 1, wherein the femoral component (100) is provided with clamping grooves (140), the clamping grooves (140) being provided in two and located on the left and right sides of the femoral component (100), respectively.

9. The knee prosthesis system for animals according to claim 1, wherein the medial side of the femoral component (100) comprises a first contact surface (111), a second contact surface (112), a third contact surface (113) and a fourth contact surface (114), the first contact surface (111), the second contact surface (112), the third contact surface (113) and the fourth contact surface (114) are arranged in sequence from bottom to top and are connected, the second contact surface (112) extends in a vertical direction, an included angle between the first contact surface (111) and the second contact surface (112) ranges from 80 ° to 110 °, an included angle between the third contact surface (113) and the second contact surface (112) ranges from 120 ° to 160 °, and an included angle between the fourth contact surface (114) and the third contact surface (113) ranges from 120 ° to 160 °.

10. The knee prosthesis system for animals of claim 1, wherein the femoral component (100) and the tibial component (300) are one of a cobalt chrome alloy, a stainless steel, and a titanium alloy, and the liner (200) is a high molecular weight polyethylene.

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