CN217219164U - Special internal fixing device for proximal tibia joint osteotomy - Google Patents
Special internal fixing device for proximal tibia joint osteotomy Download PDFInfo
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- CN217219164U CN217219164U CN202123417321.6U CN202123417321U CN217219164U CN 217219164 U CN217219164 U CN 217219164U CN 202123417321 U CN202123417321 U CN 202123417321U CN 217219164 U CN217219164 U CN 217219164U
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- 210000002303 tibia Anatomy 0.000 title claims abstract description 47
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 29
- 239000010959 steel Substances 0.000 claims abstract description 29
- 230000008093 supporting effect Effects 0.000 claims abstract description 18
- 238000009434 installation Methods 0.000 claims abstract description 4
- 241000219122 Cucurbita Species 0.000 claims description 4
- 235000009852 Cucurbita pepo Nutrition 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 210000003275 diaphysis Anatomy 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 208000003947 Knee Osteoarthritis Diseases 0.000 abstract description 4
- 201000008482 osteoarthritis Diseases 0.000 abstract description 4
- 210000000629 knee joint Anatomy 0.000 abstract description 3
- 208000032170 Congenital Abnormalities Diseases 0.000 description 6
- 206010061619 Deformity Diseases 0.000 description 5
- 210000000988 bone and bone Anatomy 0.000 description 4
- 238000002271 resection Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 238000002513 implantation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910001069 Ti alloy Inorganic materials 0.000 description 2
- 241000469816 Varus Species 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007794 irritation Effects 0.000 description 2
- 210000003127 knee Anatomy 0.000 description 2
- 210000001699 lower leg Anatomy 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 210000004872 soft tissue Anatomy 0.000 description 2
- 210000001519 tissue Anatomy 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 208000010300 Genu Varum Diseases 0.000 description 1
- 208000012659 Joint disease Diseases 0.000 description 1
- 206010062061 Knee deformity Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 210000003423 ankle Anatomy 0.000 description 1
- 206010003246 arthritis Diseases 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000001684 chronic effect Effects 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000004064 dysfunction Effects 0.000 description 1
- 210000002683 foot Anatomy 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 210000003141 lower extremity Anatomy 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000399 orthopedic effect Effects 0.000 description 1
- 231100000915 pathological change Toxicity 0.000 description 1
- 230000036285 pathological change Effects 0.000 description 1
- 230000001575 pathological effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000006833 reintegration Effects 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
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Abstract
The utility model relates to a special internal fixation device of tibia near-end joint osteotomy, including supporting steel plate and a plurality of locking screw, supporting steel plate comprises the near-end head, intermediate junction portion and the distal end afterbody that connect gradually and integrated into one piece, be equipped with the locking screw on near-end head and the distal end afterbody respectively, still be equipped with locking/pressurization combined hole on the intermediate junction portion, locking screw matches respectively and puts into in locking screw, the locking/pressurization combined hole, the locking screw on the near-end head is including the first screw, second screw and the third screw that are horizontal arrangement to and be located the additional screw of near-end head lower part limit angle position, the installation angle of additional screw satisfies: the direction of the locking screw which is arranged in the additional screw hole is vertical to the osteotomy surface at the intercondylar eminence of the tibia. The utility model discloses can provide more for stable knee joint biomechanics environment for the joint osteotomy of shin bone near-end treatment enstrophe type knee osteoarthritis, more current steel sheet internal fixation is more firm, reliable.
Description
Technical Field
The utility model belongs to the technical field of medical instrument, a special internal fixation device of tibia near-end joint osteotomy is related to.
Background
Knee osteoarthritis is a common chronic joint disease in knee surgery, and has high morbidity, wide range of pathological changes and high degree of advanced dysfunction. The most common knee osteoarthritis is the genu varum deformity, also called as "O-leg", which is a deformity disease that when two lower limbs are naturally straightened or stand, the inner ankles of two feet can touch each other and the two knees can not close together, and is formed by the combined action of two pathological factors outside and inside the joint. Proximal open tibial osteotomy (OWHTO) is a common method for treating varus knee osteoarthritis, mainly corrects extraarticular deformity, has strong line of force correction capability, and has residual intraarticular deformity after operation. Tibial intercondylar osteotomy (TCVO) is primarily directed at correcting intra-articular deformities, but has poor line of force correction capability, less clinical utility, and lack of biomechanical basic studies on stability. Therefore, a proximal tibial combined osteotomy (CPTO) is newly proposed, which is based on the traditional high tibial osteotomy (OWHTO), and can simultaneously correct the intra-articular and extra-articular deformity of the varus type gonarthritis by performing an intra-articular osteotomy between the proximal condyles of the tibia in a manner similar to TCVO.
At present, the Tomofix internal fixing system and the additional screw are used for fixing in the CPTO operation, but the exact position and direction of the additional screw implantation are difficult to determine, and the problems of insufficient structural stability and inconvenient operation exist, so that an internal fixing orthopedic steel plate system specially applied to the CPTO operation is urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a special internal fixation device of tibia near-end combined osteotomy, which is firmer and more reliable than the existing steel plate internal fixation.
The purpose of the utility model can be realized through the following technical scheme:
the utility model provides a special internal fixation device of proximal tibia joint osteotomy, includes supporting steel plate and a plurality of locking screw, supporting steel plate comprises the near-end head, intermediate junction portion and the distal end afterbody that connect gradually and integrated into one piece, the near-end head laminating is in the preceding medial surface of proximal tibia platform, the distal end afterbody laminates in the preceding medial surface of tibial diaphysis, be equipped with the locking screw on near-end head and the distal end afterbody respectively, still be equipped with locking/pressurization combination hole on the intermediate junction portion, locking screw matches respectively and puts into in locking screw, locking/pressurization combination hole, wherein, the locking screw on the near-end head is including the first screw, second screw and the third screw that are horizontal arrangement to and be located the additional screw of near-end head lower part border angle position, the installation angle of additional screw satisfies: the direction of the locking screw which is arranged in the additional screw hole is vertical to the osteotomy surface at the intercondylar eminence of the tibia.
Furthermore, the locking screw is corresponding to the first screw hole, the second screw hole and the third screw hole and is respectively a first screw, a second screw and a third screw, the direction of the second screw which is arranged in the second screw hole and the normal line of the head part at the near end which passes through the center of the second screw hole are in the same plane, the included angle between the normal line and the direction of the second screw is 14-16 degrees, and the arrangement directions of the first screw and the third screw are in the same plane as the second screw.
Furthermore, the included angles of the connecting lines of the first screw, the third screw and the second screw are respectively 80-85 degrees.
Further, the surface curvature of the proximal head portion conforms to the surface curvature of the proximal antero-medial surface of the tibia.
Further, the edge of the outer side surface of the proximal head is smoothly curved.
Furthermore, the directions of the locking screws correspondingly placed in the locking/pressurizing combined holes are all perpendicular to the axial direction of the tibia trunk.
Furthermore, the locking/pressurizing combination holes are provided with three holes, wherein one hole is positioned on one side of the transverse tibial osteotomy surface close to the proximal head, and the other two holes are positioned on one side of the transverse tibial osteotomy surface close to the distal tail.
Furthermore, the locking/pressurizing combination hole is formed by connecting a locking threaded hole and a pressurizing round hole with a smooth inner surface, and is in a gourd shape.
Furthermore, the locking screw is composed of a screw head part and a screw rod part which are integrally formed and in an inverted cone shape, wherein a first thread matched with the locking screw hole is arranged on the outer wall surface of the screw head part, and a second thread is further arranged on the outer wall surface of the screw rod part.
Further, the pitch of the second thread is greater than the pitch of the first thread.
Furthermore, the tail end of the screw rod part is conical.
Further, the tail end of the tail part at the far end is in a shuttle shape.
Compared with the prior art, the utility model provides a special internal fixation device of osteotomy is united to shin bone near-end increases fixedly to the inboard wedge-shaped connection of tibial plateau through the locking screw that has set up a fixed angle in steel sheet main part board angle department, and the inboard and the outside portion of shin bone near-end platform are under the combined supporting role of near-end locking screw and additional locking screw, and the reintegration becomes a complete platform, for the knee joint provides more stable biomechanics environment, and more current steel sheet internal fixation is more firm, reliable.
Drawings
Fig. 1 is a schematic view of the inner front side surface of the special internal fixation device of the present invention combined with the tibia;
fig. 2 is a schematic view of the front view angle of the special internal fixation device of the present invention combined with the tibia;
fig. 3 is a schematic side view of the special internal fixing device of the present invention;
fig. 4 is a schematic front view of the supporting steel plate of the present invention;
fig. 5 is a schematic structural view of a top view of the support steel plate of the present invention;
fig. 6 is a schematic structural view of the locking screw of the present invention;
FIG. 7 is a simulated cloud obtained from finite element analysis;
the notation in the figure is:
1-supporting steel plate, 101-near end head, 102-middle connecting part, 103-far end tail;
2-locking screw hole, 201-first screw hole, 202-second screw hole, 203-third screw hole, 204-additional screw hole, 205-fourth screw hole;
3-locking/pressurizing the combination hole;
4-locking screw, 401-first screw, 402-second screw, 403-third screw, 404-additional screw, 411-screw head, 412-screw shaft, 413-screw tip, 421-first thread, 422-second thread.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
In the following embodiments or examples, functional components or structures that are not specifically described are all conventional components or structures that are adopted in the art to achieve the corresponding functions.
In order to be matched with the proximal tibia joint osteotomy for use, and improve the firmness, reliability and operation convenience of the internal fixation, the utility model provides a special internal fixation device for the proximal tibia joint osteotomy, the structure of which is shown in figures 1 to 3, comprising a supporting steel plate 1 and a plurality of locking screws 4, wherein the supporting steel plate 1 consists of a proximal head part 101, a middle connecting part 102 and a distal tail part 103 which are sequentially connected and integrally formed, the proximal head part 101 is attached to the front inner side surface of a proximal tibia platform, the distal tail part 103 is attached to the front inner side surface of a shaft of the tibia, the proximal head part 101 and the distal tail part 103 are respectively provided with a locking screw hole 2, the middle connecting part 102 is also provided with a locking/pressurizing combined hole 3, the locking screws 4 are respectively matched and placed in the locking screw hole 2 and the locking/pressurizing combined hole 3, wherein, the locking screw holes 2 on the proximal head 101 comprise a first screw hole 201, a second screw hole 202 and a third screw hole 203 which are horizontally arranged, and an additional screw hole 204 positioned at a lower corner of the proximal head 101, wherein the installation angle of the additional screw hole 204 is satisfied: the locking screw 4 inserted into the additional screw hole 204 is oriented perpendicular to the osteotomy plane at the intercondylar eminence of the tibia. Meanwhile, the length of the additional screw 404 inserted into the additional screw hole 204 is enough to penetrate through the osteotomy section, so that the inner and outer wedge-shaped bone blocks longitudinally cut at the proximal end of the tibia are connected, and the inner side of the tibia is fixedly connected and supported in a wedge-shaped manner.
In some specific embodiments, please refer to fig. 1 and the like again, the locking screws 4 are respectively a first screw 401, a second screw 402 and a third screw 403 corresponding to the first screw hole 201, the second screw hole 202 and the third screw hole 203, a direction of the second screw 402 inserted into the second screw hole 202 is in the same plane with a normal line of the proximal head 101 passing through the center of the second screw hole 202, and an angle between the normal line and an included angle is 14-16 °, and directions of the first screw 401 and the third screw 403 are in the same plane with the second screw 402.
In a more specific embodiment, the connecting lines of the first screw 401, the third screw 403 and the second screw 402 respectively have an included angle of 80-85 degrees, and can be individually adjusted based on the condition of a patient, so that the supporting effect on the tibial plateau is enhanced.
In some embodiments, please refer to fig. 5 and so on, the curvature of the surface of the proximal head 101 is consistent with the curvature of the surface of the proximal anterior-medial surface of the tibia, so as to ensure the close fit between the steel plate head and the tibia. Meanwhile, the edge of the outer side surface of the near-end head 101 is in a smooth arc shape, so that human tissues can be prevented from being scratched, and soft tissue irritation is reduced.
In some embodiments, please refer to fig. 3 and so on again, the directions of the locking/pressurizing combination hole 3 corresponding to the inserted locking screw 4 are all perpendicular to the axial direction of the tibia shaft, so as to improve the fixing effect on the tibia shaft.
In some embodiments, referring to fig. 1 and so on, the locking/compression combination hole 3 is provided with three holes, one of which is located on the lateral tibial resection surface near the proximal head 101, and the other two of which are located on the lateral tibial resection surface near the distal tail 103.
In some specific embodiments, please refer to fig. 4 and the like again, the locking/pressurizing combination hole 3 is formed by connecting a locking threaded hole and a pressurizing circular hole with a smooth inner surface, and is in a gourd shape, the locking threaded hole and the smooth pressurizing circular hole correspond to a locking screw and a common tension screw respectively, the locking screw is used for increasing the connection stability, the common tension screw is used for pressurizing, and the locking screw or the common tension screw is selected according to the operation requirement.
In some specific embodiments, please refer to fig. 6 and so on, the locking screw 4 is composed of a screw head 411 and a screw rod part 412 which are integrally formed and have an inverted conical shape, wherein an outer wall surface of the screw head 411 is provided with a first thread 421 matching with the locking screw hole 2, and an outer wall surface of the screw rod part 412 is further provided with a second thread 422. In addition, the taper of the screw head 411 can be 1: 2-1: 1.5, the screw head 411 can be matched and connected with the inner wall of the locking screw hole 2 through the first threads 421 to form a structure with a fixed angle, angle stability is provided, and meanwhile, the screw head 411 is embedded into the locking screw hole 2, and the leakage area can be reduced. The shank portion has a strong resistance to bending and shearing and transfers loads into the bone.
In a more specific embodiment, the pitch of the second thread 422 is greater than that of the first thread 421, the proximal tibial screw is close to the tibial plateau, and the pitch of the first thread is smaller, so that the screw can be prevented from being driven too much into the joint, and the use safety of the internal fixing device is ensured.
In a more specific embodiment, the screw shaft 412 has a tapered distal end.
In some embodiments, the distal end of the distal tail 103 is shaped like a shuttle to facilitate implantation of the instrument.
In some specific embodiments, the material of the supporting steel plate 1 and the material of the locking screw 4 are both titanium alloy, which has high strength and good biocompatibility for human body. Meanwhile, the length of the supporting steel plate 1 can be 100-130 mm, the width of the proximal end head 101 can be 30-39 mm, the thickness is 2.4-3.1 mm, the locking screw 4 with the diameter of about 4.5-5.0 mm can be accepted, the length of the locking screw 4 is 24-75 mm, the type number is selected according to different body types of patients, and the corresponding function is met.
The above embodiments may be implemented individually, or in any combination of two or more.
The above embodiments will be described in more detail with reference to specific examples.
Example 1:
in order to cooperate with the proximal tibial combined osteotomy to improve the firmness, reliability and operational convenience of the internal fixation, the embodiment provides a special internal fixation device for the proximal tibial combined osteotomy, the structure of which is shown in fig. 1 to 3, comprising a support steel plate 1 and a plurality of locking screws 4, wherein the support steel plate 1 is composed of a proximal head 101, a middle connecting part 102 and a distal tail 103 which are sequentially connected and integrally formed, the proximal head 101 is attached to the anterior medial surface of a proximal tibial platform, the distal tail 103 is attached to the anterior medial surface of a tibial diaphysis, the proximal head 101 and the distal tail 103 are respectively provided with a locking screw hole 2, the middle connecting part 102 is further provided with a locking/pressurizing combination hole 3, the locking screws 4 are respectively and fittingly placed in the locking screw hole 2 and the locking/pressurizing combination hole 3, wherein the locking screw hole 2 on the proximal head 101 comprises a first screw hole 201, a second screw hole and a second screw hole which are horizontally arranged, A second screw hole 202 and a third screw hole 203, and an additional screw hole 204 at a lower corner of the proximal head 101, the additional screw hole 204 being installed at an angle satisfying: the locking screw 4 inserted into the additional screw hole 204 is oriented perpendicular to the osteotomy plane at the intercondylar eminence of the tibia. Meanwhile, the length of the additional screw 404 inserted into the additional screw hole 204 is enough to penetrate through the osteotomy section, so that the inner and outer wedge-shaped bone blocks longitudinally cut at the proximal end of the tibia are connected, and the inner side of the tibia is fixedly connected and supported in a wedge-shaped manner. At the same time, two fourth screw holes 205 are also provided at the distal tail 103, and lock screws matched with the fourth screw holes are arranged in the fourth screw holes.
Referring to fig. 1 and the like again, the locking screws 4 are respectively a first screw 401, a second screw 402 and a third screw 403 corresponding to the first screw hole 201, the second screw 202 and the third screw hole 203, the direction of the second screw 402 inserted into the second screw hole 202 and the normal of the proximal head 101 passing through the center of the second screw hole 402 are in the same plane, the included angle between the normal and the normal is 14-16 °, and the insertion directions of the first screw 401 and the third screw 403 are in the same plane as the second screw 402. The included angles of the connecting lines of the first screw 401, the third screw 403 and the second screw 402 are respectively 80-85 degrees, personalized adjustment can be performed based on the condition of a patient, and the supporting effect on the tibial plateau is enhanced.
As shown in fig. 5, the surface curvature of the proximal head 101 is consistent with the surface curvature of the proximal anterior medial surface of the tibia, so as to ensure close fitting between the steel plate head and the tibia. Meanwhile, the edge of the outer side surface of the proximal head 101 is in a smooth arc shape, so that human tissues can be prevented from being scratched, and soft tissue irritation is reduced.
Referring to fig. 3, the locking/pressurizing combination hole 3 is perpendicular to the axial direction of the tibia shaft with respect to the direction of the inserted locking screw 4, so as to improve the fixing effect on the tibia shaft.
Referring again to fig. 1 and the like, the locking/compression combination hole 3 is provided with three holes, one of which is located on the side of the transverse tibial resection surface near the proximal head 101, and the other two of which are located on the side of the transverse tibial resection surface near the distal tail 103.
Referring to fig. 4, the locking/pressurizing combination hole 3 is formed by connecting a locking threaded hole and a pressurizing circular hole with a smooth inner surface, and is in a gourd shape, the locking threaded hole and the smooth pressurizing circular hole respectively correspond to a locking screw and a common lag screw, the locking screw is used for increasing the connection stability, the common lag screw is used for pressurizing, and the locking screw or the common lag screw is selected according to the operation requirement.
Referring to fig. 6 and the like, the locking screw 4 is composed of a screw head 411 and a screw rod part 412 which are integrally formed and have an inverted conical shape, wherein the outer wall surface of the screw head 411 is provided with a first thread 421 matching with the locking screw hole 2, and the outer wall surface of the screw rod part 412 is further provided with a second thread 422. In addition, the conicity of the screw head 411 can be 1: 2-1: 1.5, the screw head 411 can be matched and connected with the inner wall of the locking screw hole 2 through the first threads 421 to form a structure with a fixed angle, angle stability is provided, and meanwhile, the screw head 411 is embedded into the locking screw hole 2, so that the leakage area can be reduced. The shank portion has a strong resistance to bending and shearing and transfers loads into the bone. The screw pitch of second screw 422 is greater than the screw pitch of first screw 421, and the shin bone proximal screw is close to the tibial plateau, and first screw pitch is less can prevent that the screw from driving into too much and getting into the joint, has guaranteed the security that internal fixation device used.
The end of the screw shaft 412 (i.e., screw end 413) is tapered. The distal end of the distal tail 103 is shuttle shaped to facilitate implantation of the instrument.
In this embodiment, the supporting steel plate 1 and the locking screw 4 are made of titanium alloy, and have high strength and good biocompatibility for human body. Meanwhile, the length of the supporting steel plate 1 can be 100-130 mm, the width of the proximal end head 101 can be 30-39 mm, the thickness is 2.4-3.1 mm, the locking screw 4 with the diameter of about 4.5-5.0 mm can be accepted, the length of the locking screw 4 is 24-75 mm, the type number is selected according to different body types of patients, and the corresponding function is met.
Specifically, finite element simulation analysis is performed on the internal fixation device special for proximal tibia combined osteotomy provided by the embodiment, and the finite element simulation analysis comprises the following steps: s1, establishing a post-operation model of a tibia near-end combined osteotomy by using three-dimensional software; s2, importing the three-dimensional model obtained in the step S1 into finite element simulation software, and carrying out mesh division and material attribute setting; s3, applying boundary conditions and loads of the proximal tibia joint osteotomy model to perform simulation calculation; and S4, calculating to obtain a simulated cloud picture, observing the stress distribution condition and the structure micromotion condition, quickly modeling and carrying out simulation analysis on the post-operation model of the proximal tibial combined osteotomy to obtain the stress concentration part of the model, analyzing the stability of the special internal fixing device for the proximal tibial combined osteotomy, and further carrying out optimization design on the special internal fixing device for the proximal tibial combined osteotomy. The resulting simulated cloud is shown in fig. 7, and it can be seen from fig. 7 that the stress distribution characteristics of the tibia, the steel plate and the screws in the internal fixation device special for proximal tibia combined osteotomy are similar to those of the traditional steel plate system, and the stress is concentrated on the rear part of the steel plate, the holes around the wedge and the middle area of the screws, which shows that the device design is reliable. Meanwhile, the additional screw bears part of the load of the proximal screw, so that the risk of breakage of the proximal screw is reduced, and the stability and the success rate of CPTO are improved.
In summary, the internal fixation device dedicated for proximal tibia combined osteotomy of the present embodiment increases the connection and fixation of the internal wedge of the tibial plateau by providing the additional screw hole 204 with a fixed angle at the plate corner of the supporting steel plate 1, and the medial and lateral portions of the proximal tibial plateau are re-integrated into a complete plateau under the combined supporting action of the three locking screws 4 (i.e., the first screw 401, the second screw 402 and the third screw 403) and the additional screw 404 at the proximal end, so as to provide a more stable biomechanical environment for the knee joint, and be firmer and more reliable than the existing steel plate internal fixation.
The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention according to the disclosure of the present invention.
Claims (10)
1. A special internal fixing device for proximal tibia combined osteotomy is characterized by comprising a supporting steel plate and a plurality of locking screws, the supporting steel plate consists of a near-end head part, a middle connecting part and a far-end tail part which are sequentially connected and integrally formed, the proximal head part is jointed on the anterior medial surface of the proximal tibial plateau, the distal tail part is jointed on the anterior medial surface of the tibial diaphysis, the near-end head part and the far-end tail part are respectively provided with a locking screw hole, the middle connecting part is also provided with a locking/pressurizing combined hole, the locking screws are respectively arranged in the locking screw hole and the locking/pressurizing combined hole in a matching way, wherein the locking screw holes on the near-end head part comprise a first screw hole, a second screw hole and a third screw hole which are horizontally arranged, and an additional screw hole positioned at the lower edge position of the near-end head, wherein the installation angle of the additional screw hole satisfies the following conditions: the direction of the locking screw which is arranged in the additional screw hole is vertical to the osteotomy surface at the intercondylar eminence of the tibia.
2. The special internal fixation device for proximal tibial osteotomy of claim 1, wherein the locking screws correspond to the first screw hole, the second screw hole and the third screw hole and are respectively a first screw, a second screw and a third screw, the direction of the second screw being inserted into the second screw hole is coplanar with the normal line of the proximal head portion passing through the center of the second screw hole, the included angle with the normal line is 14-16 °, and the insertion directions of the first screw and the third screw are coplanar with the second screw.
3. The special internal fixation device for proximal tibial combined osteotomy of claim 2, wherein the included angles of the connecting lines of the first screw, the third screw and the second screw are respectively 80-85 °.
4. The special internal fixation device for proximal tibial osteotomy of claim 1, wherein the surface curvature of the proximal head conforms to the surface curvature of the proximal antero-medial surface of the tibia.
5. The special internal fixation device for proximal tibial osteotomy of claim 1, wherein the locking/compression combination hole is correspondingly inserted with a locking screw in a direction perpendicular to the axial direction of the tibial stem.
6. The special internal fixation device for proximal tibial osteotomy of claim 1, wherein said locking/compression combination hole is provided in three, one of said three holes being located on the proximal head side of the transverse tibial osteotomy surface and the other two holes being located on the distal tail side of the transverse tibial osteotomy surface.
7. The special inner fixing device for the proximal tibia osteotomy according to claim 1, wherein said locking/pressing combination hole is formed by connecting a locking threaded hole and a pressing circular hole with a smooth inner surface, and is shaped like a gourd.
8. The internal fixation device special for proximal tibia combined osteotomy according to claim 1, wherein the locking screw is composed of a screw head and a screw rod portion which are integrally formed and in an inverted cone shape, wherein a first thread matched with the locking screw hole is arranged on an outer wall surface of the screw head portion, and a second thread is further arranged on an outer wall surface of the screw rod portion.
9. The internal fixation device for proximal tibial combination osteotomy of claim 8, wherein the second thread has a pitch greater than the pitch of the first thread.
10. The special internal fixation device for proximal tibial osteotomy of claim 8, wherein the screw shaft has a tapered distal end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123417321.6U CN217219164U (en) | 2021-12-31 | 2021-12-31 | Special internal fixing device for proximal tibia joint osteotomy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123417321.6U CN217219164U (en) | 2021-12-31 | 2021-12-31 | Special internal fixing device for proximal tibia joint osteotomy |
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| Publication Number | Publication Date |
|---|---|
| CN217219164U true CN217219164U (en) | 2022-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123417321.6U Active CN217219164U (en) | 2021-12-31 | 2021-12-31 | Special internal fixing device for proximal tibia joint osteotomy |
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| CN (1) | CN217219164U (en) |
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2021
- 2021-12-31 CN CN202123417321.6U patent/CN217219164U/en active Active
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