CN117503434B

CN117503434B - But accurate regulation formula tibia tumour knee joint prosthesis of reservation joint face type

Info

Publication number: CN117503434B
Application number: CN202311742108.3A
Authority: CN
Inventors: 马淑芹; 郝改平; 邹明霞
Original assignee: Beijing Lidakang Technology Co Ltd
Current assignee: Beijing Lidakang Technology Co Ltd
Priority date: 2023-12-18
Filing date: 2023-12-18
Publication date: 2024-06-07
Anticipated expiration: 2043-12-18
Also published as: CN117503434A

Abstract

The invention provides a tibial tumor knee joint prosthesis capable of accurately adjusting a reserved joint surface, belonging to the technical field of artificial prosthesis replacement; the novel tibia proximal prosthesis comprises a steel plate type tibia proximal prosthesis, wherein a patellar ligament fixing plate is fixed on the front surface of the steel plate type tibia proximal prosthesis by adopting screws, an adjustable diaphysis extension joint is arranged at the bottom end of the steel plate type tibia proximal prosthesis, and a tibia lower section is arranged at the bottom end of the adjustable diaphysis extension joint; the adjustable backbone extension joint is sleeved with a threaded cylinder, a positioning rod is longitudinally fixed in the threaded cylinder at the central position, and a plurality of groups of counterweight components are rotatably sleeved on the outer wall of the positioning rod. According to the invention, the thread cylinder can be adjusted in an extending way according to the bone growth of children without the risk of revision surgery, the distance moved by the thread cylinder plays a role in prompting by using the detection rod, and whether the threaded hole is aligned with the positioning threaded hole can be judged at the first time, so that the adjusted thread cylinder can be locked more efficiently.

Description

But accurate regulation formula tibia tumour knee joint prosthesis of reservation joint face type

Technical Field

The invention relates to the technical field of artificial prosthesis replacement, in particular to a tibial tumor knee joint prosthesis capable of accurately adjusting a reserved joint surface.

Background

Primary and secondary malignant bone tumors are motor system tumor lesions that severely threaten the survival and quality of life of patients. Along with the development of surgical operation technology, the innovation of tumor imaging technology and the development of new auxiliary chemotherapy for malignant tumor patients, the limb protection operation has become a common knowledge for treating malignant bone tumors. Malignant tumors occurring in the diaphysis of limbs clinically need to follow the principle of extensive excision, so that the problem of reconstruction of diaphysis defect after tumor excision is of great concern, especially for children, and in recent years children are good populations of malignant bone tumors, common malignant tumors include osteosarcoma, ewing's sarcoma and the like, and the tumors often occur in the metaphyseal part of knee joint.

When the device is used on children patients, the children's body thrives over time, the bone of the device itself changes, the original replaced prosthesis device cannot be matched with the normal bone, the length and weight of the prosthesis cannot be increased over time, so that the children patients can walk and walk on a slope, and the like, and even need to do revision surgery under severe conditions, a certain time, economic effort and other expenses are required for families of the children patients, therefore, the application provides the tibial tumor knee prosthesis which can keep the joint surface type and can be accurately adjusted to meet the demands.

Disclosure of Invention

The invention aims to solve the technical problem of providing a tibial tumor knee joint prosthesis capable of accurately adjusting a reserved joint surface type so as to solve the problems of the size and the counterweight fixed value of the existing knee joint prosthesis.

In order to solve the technical problems, the invention provides the following technical scheme:

The utility model provides a but keep articular surface type accurate regulation formula tibia tumour knee joint prosthesis, includes the proximal section prosthesis of steel sheet type tibia, the anterior surface of proximal section prosthesis of steel sheet type tibia adopts the screw fixation to have patellar ligament fixed plate, the bottom of proximal section prosthesis of steel sheet type tibia is equipped with adjustable backbone extension joint, the bottom of adjustable backbone extension joint is equipped with the tibia hypomere; the adjustable diaphysis extension joint is sleeved with a threaded cylinder, a locating rod is longitudinally fixed in the threaded cylinder at the central position, a plurality of groups of counterweight components are rotatably sleeved on the outer wall of the locating rod, a fixed table is fixed at the bottom end of the threaded cylinder, a threaded ring is rotatably connected with the bottom end of the adjustable diaphysis extension joint, a medullary cavity extension handle is fixed at the bottom end of the fixed table, and the tail end of the medullary cavity extension handle extends into the lower tibia section; the counterweight assembly comprises a storage disc sleeved on the outer wall of the positioning rod, positioning rings are movably connected to the upper ends of the storage disc, outer constraint rings are sleeved on the outer walls of the upper half part and the lower half part of the storage disc, the outer constraint rings are fixed with the edges of the positioning rings, four groups of storage grooves are formed in the curved outer wall of the storage disc at equal intervals, and counterweight balls are arranged in each group of storage grooves; the limiting groove communicated with the inner wall of the adjustable diaphysis extension joint is formed in the outer wall of the adjustable diaphysis extension joint, the arc plate is arranged in the limiting groove in a sliding mode, two groups of threaded holes penetrating through the arc plate are formed in the outer wall surface of the arc plate, bolts are connected in the threaded holes in a rotating mode, constraint holes penetrating through the arc plate are formed in two sides of each threaded hole in a rotating mode, a detection rod extending into the notch groove is arranged in the constraint holes in a sliding mode, a reset spring is fixed in front of the outer wall of the detection rod and the arc plate, and an L rod is fixed at the tail end of the detection rod.

Preferably, the outer wall of the thread cylinder is provided with a notch, the curved surface of the notch is provided with a plurality of groups of positioning threaded holes, the left and right inner walls of the notch are provided with travel grooves, the inner walls of the travel grooves are provided with a plurality of groups of grooves, and the tail end of the L rod extends into the travel grooves.

Preferably, the number of grooves corresponds to the locating threaded holes, and each group of grooves is in a high flush state with the locating threaded holes.

Preferably, the diameters of the inner walls of the storage groove, the positioning threaded hole and the threaded hole are equal, and the diameters of the arc-shaped notches formed in the two groups of outer constraint rings are smaller than those of the storage groove.

Preferably, a plurality of groups of blind holes are formed in the upper end and the lower end of the storage disc, a spring is fixed between the positioning ring and the blind holes, a through hole is formed in the contact position of the storage disc and the positioning rod, and the inner wall of the through hole is connected with the positioning rod through a bearing.

Preferably, the thread ring is rotatably connected to the outer wall of the thread cylinder, a plurality of groups of ball studs extending to the inside of the adjustable backbone extension joint are arranged at the top end of the thread ring, and a constraint ring groove is formed at the contact position of the bottom end of the adjustable backbone extension joint and the ball studs.

Preferably, the positions of the outer walls of the upper and lower outer constraint rings corresponding to the storage grooves are provided with arc-shaped notches, the outer walls of the two outer constraint rings are provided with a plurality of triangular grooves, and the triangular grooves are equidistantly distributed on the outer walls of the outer constraint rings.

Preferably, a plurality of groups of hemispherical rubber are fixed on two sides of the arc plate, and a plurality of groups of hemispherical rubber blocks are fixed on inner walls on two sides of the limiting groove.

Preferably, the stroke of the limiting groove is larger than the longest distance between the two groups of positioning threaded holes.

Preferably, the inner wall of the adjustable diaphysis extension joint is fixed with a restraint piece below the arc plate, and the restraint piece extends into the notch and is in sliding connection.

Compared with the prior art, the invention has at least the following beneficial effects:

According to the scheme, the thread cylinder can be prolonged and adjusted according to the growth of the bone of the child, the risk of revision surgery is not needed, the distance of movement of the thread cylinder plays a role in prompting by using the detection rod, whether the threaded hole is aligned with the positioning threaded hole can be judged at the first time, and the adjusted thread cylinder is locked more efficiently.

The screw thread cylinder is locked by rotating the screw or not according to the fact that the threaded hole is not aligned with the positioning threaded hole through the arrangement of the arc plate, external force is applied to the guard plate to enable the guard plate to ascend or descend, whether the end portion of the detection rod is matched with the curved surface outer wall of the arc plate or not is determined, and flexibility of the prosthesis is improved in a variable mode.

The weight-increasing effect on the prosthesis is achieved by arranging the weight-increasing component, the weight-increasing component is suitable for the bone weight of children at different ages, the prosthesis is free of abnormal shapes with normal limbs after being assembled, the weight-increasing ball is added into the prosthesis through the threaded hole and the positioning threaded hole, a notch is not required to be formed in the outer wall of the threaded cylinder again, the original rigidity of the threaded cylinder is guaranteed, and the service life of the prosthesis is further prolonged.

Drawings

The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the disclosure and to enable a person skilled in the pertinent art to make and use the disclosure.

FIG. 1 is a front plan view of the present invention;

FIG. 2 is a partial perspective view of the present invention;

FIG. 3 is a perspective view of the internal structure of the adjustable diaphysis extension joint of the present invention;

FIG. 4 is a perspective view of a threaded cylinder and a stationary table of the present invention;

FIG. 5 is a view showing the internal structure of the screw barrel according to the present invention;

FIG. 6 is an expanded view of the counterweight assembly of the present invention;

FIG. 7 is a front cut-away view of the counterweight assembly of the invention;

FIG. 8 is a cut-away view of an adjustable diaphyseal extension joint of the present invention;

FIG. 9 is a front view, partially in section, of an adjustable diaphyseal extension joint of the present invention;

FIG. 10 is a perspective view of an arc plate of the present invention;

FIG. 11 is an enlarged block diagram of the portion A of FIG. 5 in accordance with the present invention;

fig. 12 is an enlarged structural view of the present invention at B in fig. 8.

In the figure: 100. a steel plate type tibia proximal prosthesis; 200. a patellar ligament fixation plate; 300. an adjustable backbone extension joint; 400. a lower tibial segment; 500. a medullary cavity extension stem;

301. a restraining sheet; 302. a constraint ring groove; 303. a limit groove; 304. hemispherical rubber blocks;

310. a threaded ring; 311. a ball stud;

320. An arc plate; 321. a bolt; 322. a detection rod; 323. hemispherical rubber; 324. a threaded hole; 325. restraining the hole; 326. a return spring; 327. an L-shaped rod;

330. a fixed table;

340. A thread cylinder; 341. a groove is formed; 342. positioning the threaded hole; 343. a positioning rod; 344. a travel groove; 345. a groove;

350. A counterweight assembly; 351. a storage disk; 352. a storage tank; 353. an outer confinement ring; 354. a positioning ring; 355. triangular grooves; 356. an arc-shaped notch; 357. a weight ball; 358. a through hole; 359. and (3) a spring.

While particular structures and devices are shown in the drawings to enable a clear implementation of embodiments of the invention, this is for illustrative purposes only and is not intended to limit the invention to the particular structures, devices and environments, which may be modified or adapted by those of ordinary skill in the art, as desired, and which remain within the scope of the appended claims.

Detailed Description

The invention provides a tibial tumor knee prosthesis with a reserved joint surface type capable of being accurately adjusted, which is described in detail below with reference to the accompanying drawings and specific embodiments. While the invention has been described herein in terms of the preferred and preferred embodiments, the following embodiments are intended to be more illustrative, and may be implemented in many alternative ways as will occur to those of skill in the art; and the accompanying drawings are only for the purpose of describing the embodiments more specifically and are not intended to limit the invention specifically.

It should be noted that references in the specification to "one embodiment," "an example embodiment," "some embodiments," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the relevant art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

Generally, the terminology may be understood, at least in part, from the use of context. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending at least in part on the context. In addition, the term "based on" may be understood as not necessarily intended to convey an exclusive set of factors, but may instead, depending at least in part on the context, allow for other factors that are not necessarily explicitly described.

It will be understood that the meanings of "on … …", "on … …" and "over … …" in this disclosure should be interpreted in the broadest sense so that "on … …" means not only "directly on" something but also includes the meaning of "on" something with intervening features or layers therebetween, and "on … …" or "over … …" means not only "on" or "over" something, but also may include its meaning of "on" or "over" something without intervening features or layers therebetween.

Furthermore, spatially relative terms such as "under …," "under …," "lower," "above …," "upper," and the like may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be otherwise oriented and the spatially relative descriptors used herein may similarly be interpreted accordingly.

As shown in fig. 1 to 12, an embodiment of the present invention provides a tibial tumor knee prosthesis with a reserved joint surface capable of being accurately adjusted, which comprises a steel plate type tibial proximal prosthesis 100, wherein a patellar ligament fixing plate 200 is fixed on the front surface of the steel plate type tibial proximal prosthesis 100 by adopting screws, an adjustable diaphysis extension joint 300 is arranged at the bottom end of the steel plate type tibial proximal prosthesis 100, and a tibial lower section 400 is arranged at the bottom end of the adjustable diaphysis extension joint 300; the adjustable backbone extension joint 300 is internally sleeved with a thread cylinder 340, the outer wall of the thread cylinder 340 is provided with a notch 341, the curved surface of the notch 341 is provided with a plurality of groups of positioning threaded holes 342, the left and right inner walls of the notch 341 are provided with travel grooves 344, and the inner walls of the travel grooves 344 are provided with a plurality of groups of grooves 345; a positioning rod 343 is longitudinally fixed at the central position in the threaded cylinder 340, a plurality of groups of counterweight components 350 are rotatably sleeved on the outer wall of the positioning rod 343, a fixed table 330 is fixed at the bottom end of the threaded cylinder 340, a threaded ring 310 is rotatably connected at the bottom end of the adjustable diaphysis extension joint 300, the threaded ring 310 is rotatably connected with the outer wall of the threaded cylinder 340, a medullary cavity extension handle 500 is fixed at the bottom end of the fixed table 330, and the tail end of the medullary cavity extension handle 500 extends into the tibia lower section 400; the counterweight assembly 350 comprises a storage disc 351 sleeved on the outer wall of a positioning rod 343, positioning rings 354 are movably connected to the upper end of the storage disc 351, outer constraint rings 353 are sleeved on the outer walls of the upper half and the lower half of the storage disc 351, the outer constraint rings 353 are fixed with the edges of the positioning rings 354, four groups of storage tanks 352 are equidistantly arranged on the curved surface outer wall of the storage disc 351, counterweight balls 357 are arranged in each group of storage tanks 352, and arc-shaped gaps 356 are formed in positions, corresponding to the storage tanks 352, of the outer walls of the upper and lower groups of outer constraint rings 353; the outer wall of the adjustable diaphysis extension joint 300 is provided with a limit groove 303 communicated with the inner wall of the adjustable diaphysis extension joint 300, an arc plate 320 is slidably arranged in the limit groove 303, two groups of threaded holes 324 penetrating through the arc plate 320 are formed in the outer wall surface of the arc plate 320, bolts 321 are rotatably connected in the threaded holes 324, constraint holes 325 penetrating through the arc plate 320 are formed in two sides of each group of threaded holes 324, a detection rod 322 extending into the notch 341 is slidably arranged in the constraint holes 325, a reset spring 326 is fixed between the outer wall of the detection rod 322 and the arc plate 320, and an L rod 327 extending into a travel groove 344 is arranged at the tail end of the detection rod 322.

The tail end of a marrow cavity extension handle 500 is positioned in a tibia lower section 400 and is fixed by bone cement or biology, a steel plate type tibia near-section prosthesis 100 is reconstructed by using MIMICS software to obtain a prosthesis design model, then an electron beam fusion or laser 3D printing technology and a numerical control technology are adopted to process to obtain a customized prosthesis consistent with the tibia anatomical data of a patient, the accuracy of the customized prosthesis can be completely matched with the tibia of a reserved part of the patient, the anatomical alignment is accurate, locking plates are arranged on two sides of the larger end of the steel plate type tibia near-section prosthesis 100 and are closely attached to the inner side of the tibia condyle of the patient, a biological coating (sprayed Ti or HA or tantalum) is sprayed on the inner side surface of the plate, and three screw holes are formed in the plate and are locked and fixed with a tibia platform through three locking bone screws; the end surface of the steel plate type proximal tibial prosthesis 100, which is clung to the epiphysis, is provided with a bone trabecular porous structure, so that the biological fusion fixing effect is enhanced; the front side of the steel plate type tibia near-section prosthesis 100 is provided with grooves with bone trabecular porous structures, and is connected with a patellar ligament fixing plate 200 by fixing screws for fixing the patellar ligament, and 8 holes are formed on the left side and the right side for suturing the collateral ligaments and the patellar ligament respectively; the patellar ligament fixing plate 200 is provided with a plurality of small holes for supplying blood for ligament tissues and blood vessels, and is also provided with 2 stepped counter bores for screwing in screws, so that the patellar ligament fixing plate 200 can fix the patellar ligament on the steel plate type tibia proximal prosthesis 100;

When the adjustable diaphysis extension joint 300 is adjusted, a minimally invasive operation is performed at the position corresponding to the threaded ring 310 on the leg of a patient, an external force is applied to rotate the bolt 321 by adopting a tool to rotate the bolt 321 so as to separate the bolt 321 from the positioning threaded hole 342 and the threaded hole 324, then a weight ball 357 prepared in advance is plugged into the threaded hole 324, and a pushing force is continuously applied to the weight ball 357 so as to enable the weight ball 357 to pass through the positioning threaded hole 342 and contact with the arc notch 356, then the pushing force is continuously applied to the weight ball 357, and further the pushing force is generated to the upper and lower outer constraint rings 353 by the arc notch 356, so that the two outer constraint rings 353 and the positioning ring 354 can be lifted and lowered, and the spring 359 can be pulled to finally enter the storage groove 352 along with the pushing force applied to the weight ball 357 through the arc notch 356, and no extrusion force is generated to the outer constraint ring 353 and the positioning ring 354 again, and the spring 357 can restore the outer constraint ring 353 by means of self bottom elasticity at the moment, the purpose is achieved for locking the weight ball 357 entering the three-angle groove 355, then the end of the tweezer is applied to the external force is continuously, the storage disc 351 is rotated until the other storage groove 352 is aligned with the positioning threaded hole 342, and the operation is repeated again, and the storage groove 357 is completed, and the storage groove is added to the four sets of balls.

Immediately, an external force is applied to the threaded ring 310 to rotate the threaded ring, but the adjustable diaphysis extension joint 300 does not rotate along with the threaded ring 310, the adjustable diaphysis extension joint 300 moves along the outer wall of the threaded cylinder 340 to fulfill the extension purpose, the counterweight ball 357 is added to the counterweight assembly 350 positioned below the arc plate 320, the weight of the counterweight ball 357 is biologically reconstructed by MIMICS software to obtain a design model of the prosthesis, and then the prosthesis is processed by adopting an electron beam fusion or laser 3D printing technology and a numerical control technology to obtain a customized prosthesis consistent with the anatomical data of the tibia of a patient, and the accuracy of the prosthesis can be matched with the bone weight of the normal leg of the patient.

While the adjustable backbone extension joint 300 moves, the arc plate 320 in the limit groove 303 moves along with the movement, the L rod 327 slides along the travel groove 344, the return spring 326 is in a compressed state, the end of the detection rod 322 extends out of the limit hole 325, when the L rod 327 is aligned with the groove 345, the return spring 326 makes the detection rod 322 move to a side close to the threaded cylinder 340, the end of the detection rod coincides with the curved surface of the outer wall of the arc plate 320, and the threaded hole 324 and the locating threaded hole 342 are in a high flush state, so that the bolt 321 can be rotated into the threaded hole 324 and the locating threaded hole 342, the end of the bolt 321 contacts with the outer wall of the counterweight ball 357 and the two groups of outer limit rings 353, and the counterweight assembly 350 and the threaded cylinder 340 are locked.

Otherwise, the end of the detecting rod 322 and the arc plate 320 extend out of the outer wall, an upward or downward external force needs to be applied to the arc plate 320, so that the arc plate 320 moves in the limiting groove 303, the detecting rod 322 and the end L rod 327 can be driven to move, the L rod 327 continues to slide in the travel groove 344 until the L rod 327 is aligned with the groove 345, at this time, the reset spring 326 enables the detecting rod 322 to move to one side close to the threaded cylinder 340, and the end of the reset spring coincides with the curved surface of the outer wall of the arc plate 320, so that the bolt 321 can be rotated to achieve the locking purpose.

As shown in fig. 3 and 8, the top end of the threaded ring 310 is provided with a plurality of groups of ball studs 311 extending into the adjustable backbone extension joint 300, and the contact position between the bottom end of the adjustable backbone extension joint 300 and the ball studs 311 is provided with a constraint ring groove 302.

The ball stud 311 can move in an annular track in the constraint ring groove 302 along with the rotation of the threaded ring 310, and the constraint ring groove 302 plays a role in constraining the ball stud 311, so that the threaded ring 310 cannot be separated from the bottom end of the adjustable backbone extension joint 300.

As shown in fig. 4, 5 and 11, the number of grooves 345 corresponds to the positioning screw holes 342, and each group of grooves 345 is in a high flush state with the positioning screw holes 342.

By utilizing the high flush state of the groove 345 and the positioning threaded hole 342, a reminding purpose is achieved on whether the lifted bolt 321 is aligned with the positioning threaded hole 342, and whether the threaded hole 324 is aligned with the positioning threaded hole 342 can be judged by only visually observing whether the end part of the detecting rod 322 is flush with the curved outer wall of the arc plate 320, so that time is saved for fixing the device after adjustment.

As shown in FIG. 3, the diameters of the inner walls of the holding tank 352, the locating threaded hole 342 and the threaded hole 324 are equal, and the two sets of outer confinement rings 353 are provided with arcuate notches 356 having diameters smaller than the diameter of the holding tank 352.

The counterweight ball 357 can conveniently enter the storage tank 352 through the threaded hole 324 and the positioning threaded hole 342, and the arc notch 356 formed by the outer constraint ring 353 is utilized to lock the entering counterweight ball 357, so that the entering counterweight ball 357 is prevented from entering a gap between the storage disk 351 and the threaded cylinder 340, and meanwhile, the additional notch formed on the outer wall of the threaded cylinder 340 is prevented from adding the counterweight ball 357, so that the original rigidity of the threaded cylinder 340 is ensured.

As shown in fig. 7, a plurality of groups of blind holes are formed at the upper and lower ends of the storage disc 351, and a spring 359 is fixed between the positioning ring 354 and the blind holes.

The spring 359 generates opposing forces on the two sets of raised and lowered retaining rings 354, which squeeze the retaining rings 354 and outer confinement rings 353 to raise as the weight balls 357 enter, whereupon the spring 359 returns, which allows the outer confinement rings 353 to lock the weight balls 357 into the holding tank 352.

As shown in fig. 5 and 6, a through hole 358 is formed at a contact position between the storage disc 351 and the positioning rod 343, and an inner wall of the through hole 358 is connected with the positioning rod 343 through a bearing;

the outer walls of the two groups of outer constraint rings 353 are provided with a plurality of groups of triangular grooves 355, and the plurality of groups of triangular grooves 355 are equidistantly distributed on the outer walls of the outer constraint rings 353.

The storage plate 351 is provided with a fixed-point rotating effect by using the positioning rod 343 and the bearing, and external force is applied by extending tweezers into the triangular grooves 355, so that the storage plate 351 can be rotated, and further the four groups of storage grooves 352 are conveniently provided with the counterweight balls 357 one by one.

As shown in fig. 9 and 10, a plurality of sets of hemispherical rubbers 323 are fixed on two sides of the arc plate 320, and a plurality of sets of hemispherical rubber blocks 304 are fixed on two inner walls of the limiting groove 303.

When the arc plate 320 moves up or down, the hemispherical rubber blocks 304 play a role in blocking the hemispherical rubber 323, so that the hemispherical rubber 323 is deformed gradually to be in a shrunken state, the hemispherical rubber 323 moves from between two groups of hemispherical rubber blocks 304 to between the other two groups of hemispherical rubber blocks 304, the arc plate 320 moving up or down is restrained, and any lifting phenomenon of the arc plate 320 is prevented.

As shown in fig. 3, the travel of the limiting groove 303 is greater than the longest distance between two sets of positioning threaded holes 342.

In response to the situation that the threaded hole 324 and the positioning threaded hole 342 are dislocated due to the moving distance of the threaded cylinder 340, the arc plate 320 can be adjusted up or down in the limiting groove 303, so that the bolt 321 can conveniently rotate into the positioning threaded hole 342 to complete the locking effect, and the flexibility of the device is further improved.

As shown in fig. 3 and 8, a restraint piece 301 is fixed on the inner wall of the adjustable backbone extension joint 300 below the arc plate 320, and the restraint piece 301 extends into the slot 341 and is slidingly connected.

The constraint plate 301 in the notch 341 is utilized to play a role in elm for the adjustable diaphysis extension joint 300, so that the synchronous rotation of the threaded ring 310 is avoided, and the length size of the prosthesis can be conveniently adjusted.

According to the technical scheme provided by the invention, the threaded cylinder can be prolonged and adjusted according to the bone growth of children, the risk of revision surgery is not needed, the distance of the threaded cylinder moving is used for achieving the prompting purpose by using the detection rod, whether the threaded hole is aligned with the positioning threaded hole can be judged at the first time, and the adjusted threaded cylinder can be locked more efficiently.

The invention is intended to cover any alternatives, modifications, equivalents, and variations that fall within the spirit and scope of the invention. In the following description of preferred embodiments of the invention, specific details are set forth in order to provide a thorough understanding of the invention, and the invention will be fully understood to those skilled in the art without such details. In other instances, well-known methods, procedures, flows, components, circuits, and the like have not been described in detail so as not to unnecessarily obscure aspects of the present invention.

Those of ordinary skill in the art will appreciate that all or a portion of the steps in implementing the methods of the embodiments described above may be implemented by a program that instructs associated hardware, and the program may be stored on a computer readable storage medium, such as: ROM/RAM, magnetic disks, optical disks, etc.

The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims

1. The utility model provides a but keep articular surface type accurate regulation formula tibia tumour knee joint prosthesis, includes the proximal section prosthesis of steel sheet type tibia, its characterized in that, the anterior surface of the proximal section prosthesis of steel sheet type tibia adopts the screw fixation to have patellar ligament fixed plate, the bottom of proximal section prosthesis of steel sheet type tibia is equipped with adjustable backbone extension joint, the bottom of adjustable backbone extension joint is equipped with the tibia hypomere;

The adjustable diaphysis extension joint is sleeved with a threaded cylinder, a locating rod is longitudinally fixed in the threaded cylinder at the central position, a plurality of groups of counterweight components are rotatably sleeved on the outer wall of the locating rod, a fixed table is fixed at the bottom end of the threaded cylinder, a threaded ring is rotatably connected with the bottom end of the adjustable diaphysis extension joint, a medullary cavity extension handle is fixed at the bottom end of the fixed table, and the tail end of the medullary cavity extension handle extends into the lower tibia section;

The counterweight assembly comprises a storage disc sleeved on the outer wall of the positioning rod, positioning rings are movably connected to the upper ends of the storage disc, outer constraint rings are sleeved on the outer walls of the upper half part and the lower half part of the storage disc, the outer constraint rings are fixed with the edges of the positioning rings, four groups of storage grooves are formed in the curved outer wall of the storage disc at equal intervals, and counterweight balls are arranged in each group of storage grooves;

The outer wall of the adjustable diaphysis extension joint is provided with a limit groove communicated with the inner wall of the adjustable diaphysis extension joint, an arc plate is slidably arranged in the limit groove, two groups of threaded holes penetrating through the arc plate are formed in the outer wall surface of the arc plate, bolts are rotationally connected in the threaded holes, two sides of each group of threaded holes are provided with constraint holes penetrating through the arc plate, a detection rod extending into the notch groove is slidably arranged in each constraint hole, a reset spring is fixed in front of the outer wall of the detection rod and the arc plate, and an L rod is fixed at the tail end of the detection rod;

The outer wall of the thread cylinder is provided with a notch, the curved surface of the notch is provided with a plurality of groups of positioning threaded holes, the left and right inner walls of the notch are provided with travel grooves, the inner walls of the travel grooves are provided with a plurality of groups of grooves, and the tail end of the L rod extends into the travel grooves;

The number of the grooves corresponds to that of the positioning threaded holes, and each group of grooves is in a high flush state with the positioning threaded holes.

2. The tibial tumor knee prosthesis of claim 1 wherein the storage slots, the locating threaded holes and the threaded holes have equal inner wall diameters, and the two sets of outer constraint rings have arcuate notch diameters smaller than the storage slots.

3. The tibial tumor knee prosthesis capable of being accurately adjusted by reserving a joint surface according to claim 1, wherein a plurality of groups of blind holes are formed in the upper end and the lower end of the storage disc, a spring is fixed between the positioning ring and the blind holes, a through hole is formed in the contact position of the storage disc and the positioning rod, and the inner wall of the through hole is connected with the positioning rod through a bearing.

4. The tibial tumor knee prosthesis with the reserved joint surface capable of being accurately adjusted according to claim 1, wherein the threaded ring is rotatably connected to the outer wall of the threaded cylinder, a plurality of groups of ball studs extending into the adjustable diaphysis extension joint are arranged at the top end of the threaded ring, and constraint ring grooves are formed at the contact positions of the bottom end of the adjustable diaphysis extension joint and the ball studs.

5. The tibial tumor knee prosthesis with the reserved joint surface type capable of being accurately adjusted according to claim 1, wherein the positions, corresponding to the storage grooves, of the outer walls of the upper outer constraint ring and the lower outer constraint ring are provided with arc-shaped notches, the outer walls of the two outer constraint rings are provided with a plurality of groups of triangular grooves, and the triangular grooves are equidistantly distributed on the outer walls of the outer constraint rings.

6. The tibial tumor knee prosthesis with the reserved joint surface capable of being accurately adjusted according to claim 1, wherein a plurality of groups of hemispherical rubbers are fixed on two sides of the arc plate, and a plurality of groups of hemispherical rubber blocks are fixed on two side inner walls of the limiting groove.

7. The precision-adjustable tibial tumor knee prosthesis of claim 1 wherein the limit slot has a travel greater than the longest distance between two sets of locating threaded holes.

8. The tibial tumor knee prosthesis of claim 1 wherein the inner wall of the adjustable diaphyseal extension joint is fixed with a constraint tab positioned below the arc plate, the constraint tab extending into the slot and slidingly connected.