CN114587559A - Matched stack formula osseointegration screw - Google Patents
Matched stack formula osseointegration screw Download PDFInfo
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- CN114587559A CN114587559A CN202210374834.3A CN202210374834A CN114587559A CN 114587559 A CN114587559 A CN 114587559A CN 202210374834 A CN202210374834 A CN 202210374834A CN 114587559 A CN114587559 A CN 114587559A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8605—Heads, i.e. proximal ends projecting from bone
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8605—Heads, i.e. proximal ends projecting from bone
- A61B17/861—Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver
- A61B17/8615—Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver at the central region of the screw head
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8625—Shanks, i.e. parts contacting bone tissue
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8685—Pins or screws or threaded wires; nuts therefor comprising multiple separate parts
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Abstract
The invention discloses a matched bone integration screw, which belongs to the technical field of medical equipment and solves the problems that the existing screw has poor effect and a bone screw is easy to loosen and even break, and the technical key points are as follows: the method comprises the following steps: the matched stack type osseointegration internal and external nut fixing pile comprises a screw head, a screw neck, a threaded rod main body and a screw tip, wherein the screw tip is connected with one end of the threaded rod main body, the other end of the threaded rod main body is connected with one end of the screw neck, and the other end of the screw neck is connected with the screw head; the matched stack type osseointegration internal screw is used for being matched with the matched stack type osseointegration internal and external nut fixing piles, and comprises a screw head, a screw main body and a screw tip, wherein the screw tip is connected with one end of the screw main body, and the other end of the screw main body is connected with the screw head.
Description
Technical Field
The invention relates to the technical field of medical equipment, in particular to a matched bone integration screw.
Background
Orthopaedic artificial implants rely on bone screws to mechanically fix the implant to the bone, achieving initial stabilization. Initial stabilization facilitates bone distraction into the artificial implant, i.e., osteointegration. Long-term stability can only be achieved if the artificial implant is osteointegrated with the host bone.
Bone screws are commonly used for stabilization, fixation, fusion of human bones and for fixation between human bones and orthopedic implants. In the orthopedic joint replacement surgery, particularly in the fixation of an acetabular cup in hip joint revision replacement and the prosthetic repair reconstruction after the resection of a huge pelvic tumor, as the stress condition of screws is complex and the long-term osseointegration fixing capability is lacked, the fixation of the prosthesis fails due to the phenomena of screw loosening, screw withdrawal and the like after the fixation of the prosthesis screws of some patients, and the long-term prognosis is affected. The screw material made of other biocompatible materials except metal materials has poor mechanical properties compared with metal materials, and can partially realize the bone growth effect, but the phenomena of nail body fracture, screw absorption and the like can occur in long-term follow-up, so that the screw material is not suitable for pseudo-in-vivo plants which need to be firmly fixed for a long time. Meanwhile, in hip revision, pelvis reconstruction and other types of operations, bone damage in an operation area is often very serious, residual acetabulum and sacrum are not enough for bearing a revision acetabular cup or close fitting and fixing of a reconstruction prosthesis, a titanium net may need to be fixed above the residual bone, and then the revision acetabular cup is fixed through the titanium net, or bone tissues and the prosthesis are connected and fixed through the sacrum and pubic bone residues after the prosthesis and the tumor are removed by screws. The traditional screw is used for fixing, so that the flexibility is poor, the screw is difficult to take out during re-renovation, the bone is damaged greatly, and the like. The contradiction that the fixation is not firm when the bone is not grown into the bone and the bone is not easy to take out when the bone is grown into the bone.
On the other hand, the osseointegration of the conventional orthopedic artificial implant is achieved by contacting a certain part of the artificial implant with a bone, mechanically fixing the artificial implant with a bone screw for stabilization, and then performing osseointegration, i.e. the integration between the surface of the artificial implant and the surface of the host bone, such as the integration between the surface of an acetabular bone-filing surface and the surface of an artificial acetabular prosthesis, the integration between an artificial femoral stem and the inner wall of a medullary cavity, and the like. In this type of facet-to-facet osseointegration, the bone screws are used only for mechanical fixation, while between the screws and the prosthesis there is only a pressure effect, which by itself cannot form an integration effect with the surrounding bone. If the face of the artificial implant is not integrated with the facial bone of the host bone, prolonged stress stimulation may cause the screw to loosen and even break, rendering the artificial implant ineffective.
In order to solve the problems that the long-term osseointegration effect between a bone screw and a host bone is poor, the bone screw is easy to loosen and even break, and the prosthesis and the screw need to be taken out simultaneously in the prosthesis renovation process, so that the damage to residual bone is serious and the flexibility is poor in the prior art, the invention provides a pile-column-surface combined osseointegration method for an artificial implant, which is used for a combined type combined osseointegration screw for the combined osseointegration of the artificial implant.
Disclosure of Invention
In view of the shortcomings of the prior art, an object of the present invention is to provide a matched set osseointegration screw to solve the above problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
a modular osseointegration screw comprising:
the matched stack type osseointegration internal and external nut fixing pile comprises a screw head, a screw neck, a threaded rod main body and a screw tip, wherein the screw tip is connected with one end of the threaded rod main body, the other end of the threaded rod main body is connected with one end of the screw neck, and the other end of the screw neck is connected with the screw head; and
the matched assembled osseointegration internal screw comprises a screw head, a screw main body and a screw tip, wherein the screw tip is connected with one end of the screw main body, the other end of the screw main body is connected with the screw head, and the length and the diameter of the screw main body are the same as the length and the inner diameter of an internal thread matched with the screw main body.
As a further aspect of the present invention, one third of the head of the threaded rod body is cancellous bone threads, one third to two thirds of the head of the threaded rod body are gradual threads, and two thirds to the tail of the head of the threaded rod body are cortical bone threads.
As a further scheme of the invention, the surfaces of the cancellous bone threads, the gradual change threads and the cortical bone threads are all covered with a fine microporous structure, and the cancellous bone threads, the gradual change threads and the cortical bone threads are all designed into smooth grooves.
As a further scheme of the invention, the shapes of the screw head and the screw neck are both hollow cylinders, and the outer wall of the screw head is provided with a cross-shaped groove for matching with a cross wrench.
As a further scheme of the invention, the matched bone integration internal and external nut fixing pile is internally provided with internal threads, and the internal threads extend from the head part to the tip part to one third of the position in the nail body.
As a further scheme of the invention, the head of the inner screw comprises an inner screw component a and an inner screw component b, wherein a locking thread is arranged outside the head of the inner screw component a and is used for realizing locking effect by matching with a locking screw hole of an orthopedic implant, and the head of the inner screw component b is in a non-thread design and is used for matching with a screw gasket and fixing the implant in an acetabulum reconstruction titanium net.
As a further scheme of the invention, a gasket is arranged between the matched type osseointegrated internal screw and the matched type osseointegrated internal and external nut fixing piles and is used for connecting the osseointegrated internal screw and the metal endophyte.
As a further scheme of the invention, the surface of the gasket is provided with anti-skid lines.
In summary, compared with the prior art, the embodiment of the invention has the following beneficial effects:
(1) the outer threaded rod body of the assembled joint bone integration screw adopts a stepped variable-pitch design of cancellous bone threads, gradual-change threads and cortical bone threads, and through the design of the cancellous bone threads near the tip of the screw, the stress concentration between the threads and the bone is reduced in the screwing-in process and the fixing process of the inner nut and the outer nut, so that the damage to the bone and the occurrence of bone dissolution are reduced, the tight combination between the surface of the inner nut and the cancellous bone is realized, the bone integration effect is achieved, and the overall long-term fixing stability of the screw is improved. Through the design of the gradually-changed threads in the middle of the inner nut body and the outer nut body, the stress decomposition after implantation is realized, the stress shielding is reduced, and through the design of the compact cortical bone threads in the middle rear part of the inner nut body and the outer nut body, the fixing strength between the inner nut body and the outer nut body and the cortical bone can be improved, the early strong fixation of the whole screw is realized, the long-term osseointegration is realized, and the long-term fixing effect of the prosthesis is improved;
(2) the invention provides a pile-column-surface combined osseointegration method for an artificial implant, which is used for a combined osseointegration screw of the artificial implant to firstly install a combined osseointegration internal and external nut fixing pile which has osseointegration performance and good nail body strength into a bone structure for fixing a prosthesis on the basis of the integration of a surface bone and a surface bone to form a 'pile' of the artificial implant to serve as a connection base, then a combined osseointegration internal screw is screwed into the internal and external nut to serve as a 'column' in a bone and bone implant connection structure, and at the moment, the pile-column structure can be adjusted in a fixed position by adjusting the depth of the internal and external nut in the bone, and the fine adjustment of the formed 'surface' is realized by matching with b-type internal screws, an acetabulum repair titanium net or cushion blocks and other orthopedic plants. Finally, the inner and outer nut-inner screw combined structure is connected with the implant through the inner screw gasket, so that the integration of the 'surface' is realized;
(3) when a large number of bone defects exist below the implant or the surface morphology of the prosthesis is not well matched with that of the host bone, the locking osseointegration screw can realize the fixation of the prosthesis and the host bone through the osseointegration function of the locking osseointegration screw and the host bone and the locking function of the a-type inner screw and the prosthesis. At the moment, the locking osseointegration screw independently plays a role of a column, so that the locking osseointegration screw serves as an inner support between the prosthesis and a host bone to realize the stable fixation of the prosthesis;
(4) in reconstruction occasions needing larger-area bone defects, such as acetabulum repair reconstruction and the like, the assembled combined osseointegration screw can pressurize and fix the acetabulum reconstruction titanium mesh through a gasket connected with the head of the b-type inner screw, thereby realizing the combined fixation of the inner and outer nuts (piles), the inner screw (columns) and the reconstruction titanium mesh (surface).
In order to more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is a schematic working diagram of an inner screw assembly a in the embodiment of the invention.
Fig. 2 is a schematic working diagram of the inner screw assembly b in the embodiment of the invention.
Reference numerals are as follows: 1-guide needle hole, 2-cancellous thread, 3-gradual change thread, 4-cortical thread, 5-internal screw component a, 6-locking thread, 7-internal screw component b, 8-internal screw thread, 9-gasket and 10-anti-skid thread.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Specific implementations of the present invention are described in detail below with reference to specific embodiments.
In one embodiment, a set-up osseointegration screw, see fig. 1-2, comprises:
the matched stack type osseointegration internal and external nut fixing pile comprises a screw head, a screw neck, a threaded rod main body and a screw tip, wherein the screw tip is connected with one end of the threaded rod main body, the other end of the threaded rod main body is connected with one end of the screw neck, and the other end of the screw neck is connected with the screw head; and
the matched assembled osseointegration internal screw comprises a screw head, a screw main body and a screw tip, wherein the screw tip is connected with one end of the screw main body, the other end of the screw main body is connected with the screw head, and the length and the diameter of the screw main body are the same as the length and the inner diameter of an internal thread matched with the screw main body.
Further, referring to fig. 1-2, one third of the head of the threaded rod body is cancellous bone threads 2, one third to two thirds of the head of the threaded rod body are gradually changed threads 3, and two thirds to the tail of the threaded rod body are cortical bone threads 4.
Further, referring to fig. 1 to 2, the surfaces of the cancellous bone thread 2, the tapered thread 3 and the cortical bone thread 4 are all covered with a fine and dense micro-porous structure, and the cancellous bone thread 2, the tapered thread 3 and the cortical bone thread 4 are all designed as smooth grooves.
Further, referring to fig. 1 to 2, the screw head and the screw neck are both hollow cylinders, and the outer wall of the screw head is provided with a cross-shaped groove for matching with a cross wrench.
Further, referring to fig. 1 to 2, the head of the inner screw includes an inner screw assembly a5 and an inner screw assembly b7, wherein the outer portion of the head of the inner screw assembly a5 is provided with a locking thread 6 for realizing locking effect by matching with a locking screw hole of an orthopedic implant, and the outer portion of the head of the inner screw assembly b7 is designed without threads for matching with a screw washer for fixing implants such as an acetabulum reconstruction titanium mesh.
Further, referring to fig. 1 to 2, a gasket 9 is disposed between the assembled osseointegrated internal screw and the assembled osseointegrated internal and external nut fixing piles, and the gasket 9 is used for connecting the osseointegrated internal screw and the metal implant.
Further, referring to fig. 1 to 2, the surface of the gasket 9 is provided with anti-skid grains 10.
In this embodiment, the assembled osseointegrated internal and external nut fixation peg is used for screwing in bone before installation of the orthopedic implant, and forms fixation in the bone by using the osseointegrated effect of the bone to receive the orthopedic implant connected above. The matched stack formula osseointegration inside and outside nut spud pile appearance is the hollow screw structure, and external form can divide into screwhead, screw neck, threaded rod main part and screw point portion, screwhead with the shape of screw neck is hollow cylinder, the whole screw surface covering of threaded rod main part has microporous structure. The screw is internally provided with internal threads, and the internal threads extend from the head part to the tip part to one third of the position in the nail body. The outer wall of the head of the screw is provided with a cross-shaped groove used for being matched with a cross wrench for use. The main body of the nut fixing pile is divided into three parts, the part from the nail head to the front third of the nail body is cylindrical, the diameter of the main body is smaller than the maximum diameter of the screw, the part from the front third to the part 10mm away from the nail tail is conical, the diameter gradually reaches the maximum diameter, the part 10mm at the nail tail is cylindrical, and the diameter of the main body is the maximum diameter of the screw.
The surface of the nail body is covered with threads, the threads are cancellous threads 2 at one third of the head part, the thread pitch gradually decreases from the one third of the head part to the cylindrical area at the tail part of the nail, the threads are designed to be smooth grooves, the thread surface is completely covered with a fine microporous structure to facilitate bone ingrowth, the overall length of the inner and outer nut fixing piles ranges from 20mm to 100mm, the maximum outer diameter ranges from 4 mm to 10mm, the minimum outer diameter ranges from 1.5 mm to 5mm, the inner thread diameter ranges from 2mm to 8mm, the thread depth of the outer threads ranges from 0.5mm to 2mm, the thread width ranges from 0.5mm to 3mm, the ratio of the thread width to the thread pitch ranges from 1:2 to 1:5, the inner screw thread 8 is 1mm in depth, the inner screw thread 8 is 0.5mm in width, a hollow guide pinhole 1 penetrating through the center of the inner and outer nut fixing piles is arranged for guiding implantation by using a kirschner needle in the operation, the diameter of the hollow guide needle hole 1 is set to be 3.5mm according to the different diameters of the screws.
The assembled osseointegration internal screw is used for being matched with an external nut fixing pile to realize the fixation of the orthopedic implant. The inner screw comprises a screw head, a screw main body and a screw tip, wherein the length and the diameter of the inner screw main body are the same as those of an internal thread matched with the inner screw main body, the screw tip is an obtuse round head, the shape of the blunt round head is matched with the bottom of the inner screw of the inner and outer nut fixing piles, the height of the screw head is 2mm, and the diameter of the screw head is the same as the maximum outer diameter of the tail of the outer nut fixing pile. The nail head of the inner screw is divided into two designs, wherein the locking thread 6 is arranged outside the nail head of the inner screw component a5 and is used for realizing the locking effect by the locking nail hole matching of orthopedic endophytes, and the outer part of the nail head of the inner screw component b7 is in a non-thread design and is used for matching with a screw gasket and fixing the endophytes such as an acetabulum reconstruction titanium net and the like.
The spacer 9 is used for connecting the osseointegrated inner screw with a metal implant, such as a titanium mesh or a metal spacer for acetabular revision reconstruction. The shape of the washer is a circular ring structure with a concave middle part, the washer is arranged between an inner screw and an inner and outer nut fixing pile, the diameter of the concave part of the washer 9 is the same as that of the head of the inner screw, and the surface of the washer 9 is provided with anti-loose and anti-skid threads 10. The diameter of the outer edge is increased by 3-5mm compared with the diameter of the inner part, the thickness of the gasket 9 is 2mm, and the material is titanium alloy.
The working principle of the invention is as follows:
the matched bone integration internal and external nut fixing pile with bone integration performance and good nail body strength is firstly installed in a bone structure for fixing a prosthesis to form a 'pile' of the artificial implant to serve as a connection base, then a matched bone integration internal screw is screwed into the internal and external nut to serve as a 'column' of the bone and bone implantation connection structure, at the moment, the pile-column structure can be adjusted at a fixed position by adjusting the depth of the internal and external nut in the bone, and the fine adjustment of a 'surface' formed by the pile-column structure is realized by matching with the internal screw component b7 and orthopedic implants such as an acetabulum repair titanium net or cushion block and the like. And finally, the inner and outer nut-inner screw combined structure is connected with the implant through the inner screw gasket, so that the integration of the 'surface' is realized.
Meanwhile, when a large amount of bone defects exist below the implant or the surface morphology matching of the prosthesis and the host bone is poor, the locking osseointegration screw can realize the fixation of the prosthesis and the host bone through the osseointegration function of the locking osseointegration screw and the host bone and the locking function of the inner screw component a5 and the prosthesis. At the moment, the locking osseointegration screw independently plays a role of a 'column', so that the locking osseointegration screw serves as an 'inner support' between the prosthesis and a host bone, and the stable fixation of the prosthesis is realized.
For example, in a reconstruction surgery of the acetabulum with a large range of acetabular defects, the base of the acetabulum may be totally missing for disease reasons, leaving only the pubic ramus, the ischial branch, and the iliac portion above the acetabulum. In the traditional operation reconstruction method, an acetabulum reinforcing titanium mesh can be fixed on residual bone by screws to reconstruct the shape of the acetabulum, and then the acetabulum prosthesis for reconstruction is fixed by bone cement to be reconstructed. Then, in actual operation, due to lack of osseointegration ability, the long-term fixation stability of the fixed titanium mesh is poor, screw loosening is easy to occur, and further, situations such as titanium mesh sinking occur, and the long-term prognosis effect is influenced. And under the concept of 'pile-column-surface' combined osseointegration fixation, the fixation of the titanium mesh and residual bone (pubic ramus, ischium branch, anterior iliac column and posterior iliac column) can be realized from three aspects: firstly, the external thread design of the internal and external nut components of the matched bone integration screw provides the down pressure and the cancellous bone-cortical bone fixing capacity of the traditional screw, and the gradual external thread design uniformly disperses the screw pressure and provides good initial stability; secondly, the osseointegration threads of the main body parts of the inner and outer nut assemblies and the microporous structures covered on the surfaces of the threads reduce bone destruction and bone dissolution after implantation in the screwing process, realize bone ingrowth and osseointegration effects, and improve the long-term fixation stability of screws and residual bone; thirdly, the operation flexibility in the process of implanting the screw is greatly improved through the matched screw structure, the inner nut component and the outer nut component can be implanted into residual bone in a 'pile' mode, and a 'connecting column' of orthopedic implants such as a reconstructed titanium net is formed by adjusting the implantation depth and matching with the inner screw component b7 and a screw gasket, and the 'surface' of the reconstructed acetabulum formed by the reconstructed implants is adjusted. At the moment, the assembled osseointegration screw realizes the surface-surface fixation by playing the function of the traditional screw, and also constructs an inner support which plays the roles of supporting and fixing between the fixing surfaces through the component design, thereby strengthening the fixation between residual bone of acetabulum and reconstructed titanium mesh and realizing the pile-column-surface combined osseointegration. After long-term use, if the implant of the titanium mesh or the acetabulum reconstruction prosthesis fails and a revision operation is needed, the titanium mesh and the prosthesis can be replaced only by taking out the inner screw, the inner nut and the outer nut which realize osseointegration are not affected, the damage to residual sclerotin in the revision operation is reduced, and the bone mass is reserved.
As another example, in a hemi-pelvic replacement, a prosthesis of the iliac and pubic portions needs to be fixed to the sacrum and the contralateral ilia by screws, and in the case of conventional screws, the total fixation strength of the prosthesis depends on the downward force applied by the screws to the prosthesis for "face-to-face" fixation of the prosthesis to the bone. In a complex biomechanical environment after the prosthesis is implanted, nail pulling often occurs, so that the prosthesis fails, and the long-term follow-up effect is poor. By using the pile-column-surface bone integration method disclosed by the invention, the inner nut and the outer nut can be fixed in a sacrum and pubis safe area as a pile, the bone integration of the screw with the sacrum and the pubis is realized through the bone integration design and the surface microporous structure of the inner nut and the outer nut, and the whole body of the prosthesis and the assembled bone integration screw is mechanically locked by matching with the locking thread 6 of the inner screw component a5 on the basis of the inner nut and the outer nut. Meanwhile, in the process, the implantation depth of the inner nut and the outer nut can be adjusted according to actual conditions to realize the pressurized fixation of the prosthesis, and the bone ingrowth is further promoted in the contact area of the prosthesis and the bone, so that the initial stability and the long-term stability are improved. After long-term use, if the prosthesis is invalid and needs to be subjected to a revision operation, the prosthesis can be replaced only by taking out the inner screw, the inner nut and the outer nut which realize osseointegration are not affected, the operation difficulty and duration in the revision operation are reduced, and the scale of the revision operation and the influence on a patient are controlled.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A modular osseointegration screw, comprising:
the matched stack type osseointegration internal and external nut fixing pile comprises a screw head, a screw neck, a threaded rod main body and a screw tip, wherein the screw tip is connected with one end of the threaded rod main body, the other end of the threaded rod main body is connected with one end of the screw neck, and the other end of the screw neck is connected with the screw head; and
the matched assembled osseointegration internal screw comprises a screw head, a screw main body and a screw tip, wherein the screw tip is connected with one end of the screw main body, the other end of the screw main body is connected with the screw head, and the length and the diameter of the screw main body are the same as the length and the inner diameter of an internal thread matched with the screw main body.
2. The bone integration screw of claim 1, wherein the threaded shank body has a cancellous thread at a head third, a gradual thread at a body third to two thirds, and a cortical thread at a body third to a tail.
3. The matched set osseointegration screw according to claim 2, wherein the cancellous, tapered and cortical thread surfaces are all covered with a fine micro-porous structure, the cancellous, tapered and cortical thread being of smooth groove design.
4. The matched set osseointegration screw according to claim 1, wherein the screw head and the screw neck are both hollow cylinders and the outer wall of the screw head is provided with a cross-shaped groove for use with a cross-shaped wrench.
5. The matched set osseointegrated screw according to claim 1, wherein the matched set osseointegrated inner and outer nut pegs are internally threaded and extend from the head to the tip to one third of the inside of the body.
6. The matched stack osseointegration screw according to claim 1, wherein the inner screw head comprises an inner screw component a and an inner screw component b, wherein the outer part of the head of the inner screw component a is provided with locking screw thread for the locking screw hole matching of orthopedic implants to realize locking effect, and the outer part of the head of the inner screw component b is designed without screw thread for matching with screw washer for installing the fixation of the acetabular reconstruction titanium network.
7. The matched stack osseointegration screw of claim 1, wherein a gasket is arranged between the matched stack osseointegration internal screw and the matched stack osseointegration internal and external nut fixing piles, and the gasket is used for connecting the osseointegration internal screw and the metal implant.
8. The matched set osseointegrated screw of claim 7, wherein the shim surface is provided with anti-slip threads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210374834.3A CN114587559A (en) | 2022-04-11 | 2022-04-11 | Matched stack formula osseointegration screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210374834.3A CN114587559A (en) | 2022-04-11 | 2022-04-11 | Matched stack formula osseointegration screw |
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