CN113456305B - Bionic surface hip joint prosthesis convenient for operation - Google Patents
Bionic surface hip joint prosthesis convenient for operation Download PDFInfo
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- CN113456305B CN113456305B CN202110671099.8A CN202110671099A CN113456305B CN 113456305 B CN113456305 B CN 113456305B CN 202110671099 A CN202110671099 A CN 202110671099A CN 113456305 B CN113456305 B CN 113456305B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/32—Joints for the hip
- A61F2/34—Acetabular cups
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/32—Joints for the hip
- A61F2/36—Femoral heads ; Femoral endoprostheses
- A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
- A61F2002/3006—Properties of materials and coating materials
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
- A61F2002/3006—Properties of materials and coating materials
- A61F2002/30062—(bio)absorbable, biodegradable, bioerodable, (bio)resorbable, resorptive
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30433—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/32—Joints for the hip
- A61F2/34—Acetabular cups
- A61F2002/348—Additional features
- A61F2002/3483—Additional features having a convex shape, e.g. hemispherical heads
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/32—Joints for the hip
- A61F2/36—Femoral heads ; Femoral endoprostheses
- A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
- A61F2002/3611—Heads or epiphyseal parts of femur
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00011—Metals or alloys
- A61F2310/00035—Other metals or alloys
- A61F2310/00089—Zirconium or Zr-based alloys
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00011—Metals or alloys
- A61F2310/00035—Other metals or alloys
- A61F2310/00095—Niobium or Nb-based alloys
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- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Prostheses (AREA)
Abstract
The invention relates to the technical field of medical instrument design, in particular to a bionic surface hip joint prosthesis convenient for surgical operation, which comprises an acetabular cup prosthesis, a femoral head prosthesis, a prosthesis intermediate body, a pressure main nail and Zhang Lifu nails, wherein the femoral head prosthesis is arranged in the acetabular cup prosthesis, the inner surface of the acetabular cup prosthesis is in hemispherical sliding friction fit with the outer surface of the femoral head prosthesis, the prosthesis intermediate body is arranged in the femoral head prosthesis, the outer surface of the prosthesis intermediate body is matched with the inner surface of the femoral head prosthesis through a conical surface, the contact surfaces of the acetabular cup prosthesis, the femoral head prosthesis and the prosthesis intermediate body with bones are all 3D printing trabecular bone structures, and the rear end parts of the pressure main nail and the Zhang Lifu nails are connected with the prosthesis intermediate body. The instrument provided by the invention has low friction coefficient and metal ion precipitation, has good long-term bone ingrowth performance and can reconstruct the physiological fulcrum of the hip joint.
Description
Technical Field
The invention relates to the technical field of medical instrument design, in particular to a bionic surface hip joint prosthesis convenient for operation.
Background
A surface hip prosthesis is an orthopedic implant for replacing a part of a human hip joint. Is used for surface hip joint replacement operation. The surface hip joint prosthesis mainly comprises an acetabulum outer cup prosthesis and a femoral head prosthesis which is sleeved in the acetabulum outer cup prosthesis and is inserted into the femoral head of a human body. The surface hip joint can theoretically reserve femoral bone, slow the progress of the disease condition and improve the hip joint function of patients related to the revision surgery in the future.
However, with the widespread development of surface hip replacement surgery, there are some drawbacks to this procedure. The main causes of prosthesis failure include: femoral neck fracture, femoral head collapse, prosthesis loosening and the like. The friction interface of the acetabular outer cup and the femoral head prosthesis of the conventional surface hip joint prosthesis is a cobalt-chromium-molybdenum metal 'gold-to-gold' interface, and although the friction coefficient of the 'gold-to-gold' interface is relatively lower than that of other friction interfaces, the 'gold-to-gold' interface can cause the precipitation of cobalt and chromium metal ions, which can generate adverse biological reactions including toxic effects, delayed hypersensitivity, osteolysis and certain carcinogenicity of soft tissues near joints, and finally leads to the loosening and failure of the prosthesis. The osseointegration interface of the acetabular outer cup of the prior surface hip prosthesis is a sprayed hydroxyapatite coating, and the method has the risk that the coating falls off or is absorbed within a certain period of time, so that the corresponding osseointegration effect is lost. The existing surface hip joint prosthesis is easy to cause femoral neck fracture and femoral head collapse, and the main reason is that the fixing shaft of the femoral head prosthesis cannot reconstruct physiological pivot and restore the stress form of the hip joint of a normal human body, so that the fixing failure and the complications are caused.
According to Zhang Dianying lever balance reconstruction theory, the proximal femur is a lever structure, the fulcrum of the lever structure is determined by the abduction angle and pressure of the femur and Zhang Ligu trabecula, and the normal physiological fulcrum is located near the center of the femoral head, so that a proximal femur labor-wasting lever structure is formed. The prior hip joint structural design has no theoretical support, and the design aims at reconstructing a physiological anatomical fulcrum of the hip joint and recovering pressure and Zhang Ligu trabecula to generate the fully-bionic artificial hip joint prosthesis.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the bionic surface hip joint prosthesis which has low friction coefficient, low metal ion precipitation, good long-term bone ingrowth performance and can reconstruct the physiological fulcrum of the hip joint and is convenient for operation.
The invention is realized by the following technical scheme:
a bionic surface hip joint prosthesis convenient for operation comprises an acetabular cup prosthesis, a femoral head prosthesis, a prosthesis intermediate, a pressure main nail and a Zhang Lifu nail, wherein the femoral head prosthesis is arranged in the acetabular cup prosthesis, the inner surface of the acetabular cup prosthesis is in hemispherical sliding friction fit with the outer surface of the femoral head prosthesis, the prosthesis intermediate is arranged in the femoral head prosthesis, the outer surface of the prosthesis intermediate is matched with the inner surface of the femoral head prosthesis through a conical surface, the contact surfaces of the acetabular cup prosthesis, the femoral head prosthesis and the prosthesis intermediate with bones are all 3D printing bone trabecula structures, and the rear end parts of the pressure main nail and the Zhang Lifu nail are connected with the prosthesis intermediate.
Preferably, the acetabular cup prosthesis, the femoral head prosthesis, the prosthesis intermediate, the pressure main nail and the Zhang Lifu nail are all made of zirconium-niobium alloy materials, and the inner surface of the acetabular cup prosthesis and the outer surface of the femoral head prosthesis are both subjected to oxidation treatment to form a zirconium oxide friction interface.
Optimized, the prosthesis midbody is bowl-shaped structure, and bowl-shaped structure's lower part forms conical surface cooperation and sets up two screw holes in bowl-shaped structure's side with femoral head prosthesis's internal surface, and pressure main nail and Zhang Lifu nail rear end all pass through threaded connection at screw hole department and prosthesis midbody, and pressure main nail and Zhang Lifu nail front end all are equipped with the external screw thread.
Optimally, the prosthesis intermediate body is in a frustum shape and is matched with the inner surface of the femoral head prosthesis, zhang Lifu screw thread through holes are formed in the bottom surface of the frustum, the pressure main screw and the prosthesis intermediate body are integrally formed and are of a full thread structure, the Zhang Lifu screw is of a full thread structure, and the rear end portion of the Zhang Lifu screw is installed in the Zhang Lifu screw thread hole.
Furthermore, the pressure main nail is provided with an inclined insertion hole at a position close to the femoral neck, and the Zhang Lifu nail penetrates through the inclined insertion hole and is arranged in a crossed mode with the pressure main nail.
The invention has the advantages of
The bionic surface hip joint prosthesis convenient for operation has the following advantages:
1, (1) the zirconium-niobium alloy oxide layer is integrated with the surface hip joint prosthesis after being heated at high temperature, and the problem of coating falling does not exist. (2) The surface friction coefficient of the zirconium-niobium alloy is 0.5 times of that of a cobalt-chromium alloy interface, and the zirconium-niobium alloy has excellent wear resistance. (3) The strength, corrosion resistance and lubrication degree of the zirconium-niobium alloy are superior to those of cobalt-chromium alloy, and the occurrence of prosthesis breakage and osteolysis after joint replacement can be reduced. (4) The zirconium-niobium alloy has the advantages of ideal biocompatibility and low sensitivity.
2.3D prints bone trabecula structure has following advantage: (1) the stress distribution of the 3D printed bone trabecula structure is more optimized, the maximum stress value is obviously reduced, so that the stress shielding effect can be reduced, the increase of bone around the prosthesis is facilitated, and the risk of loosening of the prosthesis is avoided. (2) The porous structure of the trabecula bone imitating the cancellous bone structure of the human body has good biocompatibility. (3) The 3D printed bone trabecula structure has high friction coefficient, high porosity and better mechanical property. (4) The 3D printing technology has low particle residue and low metal ion precipitation amount, and avoids adverse reactions of foreign body rejection, allergy and severe inflammation of a human body.
3. The fixing form of the femoral head prosthesis can restore the hip joint fulcrum to the intersection of the proximal femur tension trabecula and the pressure trabecula, and restore the normal hip joint fulcrum (near the center of the femoral head) of the human body, thereby avoiding the generation of prosthesis loosening caused by unbalanced stress of the human body hip joint.
4. The prosthesis intermediate is arranged, when in operation, the pressure main nail and the Zhang Lifu nail can be connected with the prosthesis intermediate and implanted into cortical bone, then the prosthesis intermediate is connected with the femoral head prosthesis in a matched mode through the conical surface, then the femoral head prosthesis is assembled with the acetabular cup prosthesis, the operation is completed, and the operation is easier to operate.
Drawings
FIG. 1 is a schematic diagram of an exploded structure in accordance with one embodiment of the present invention;
FIG. 2 is a schematic view of an assembly structure according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an exploded structure of a second embodiment of the present invention;
FIG. 4 is a schematic view of an assembly structure according to a second embodiment of the present invention;
FIG. 5 is a graph showing the simulated stress distribution of the control group according to the present invention;
FIG. 6 is a finite element analysis stress distribution diagram according to an embodiment of the present invention;
FIG. 7 is a two-finite-element analysis stress distribution diagram according to an embodiment of the present invention;
in the figure, 01, a femoral head prosthesis, 02, a threaded hole, 03, a prosthesis intermediate body, 04, zhang Lifu nails, 05 oblique insertion holes, 06 and a pressure main nail are arranged.
Detailed Description
A bionic surface hip joint prosthesis convenient for surgical operation comprises an acetabular cup prosthesis (not shown), a femoral head prosthesis 1, a prosthesis intermediate 3, a pressure main nail 6 and a Zhang Lifu nail 4, wherein the femoral head prosthesis is arranged in the acetabular cup prosthesis, the inner surface of the acetabular cup prosthesis is in hemispherical sliding friction fit with the outer surface of the femoral head prosthesis, the prosthesis intermediate is arranged in the femoral head prosthesis, and the outer surface of the prosthesis intermediate is in conical surface fit with the inner surface of the femoral head prosthesis. The prosthesis in the prosthesis is arranged, the pressure main nail and the Zhang Lifu nail can be connected with the prosthesis intermediate body and implanted into cortical bone during operation, then the prosthesis intermediate body is connected with the femoral head prosthesis in a matching way through the conical surface, and then the femoral head prosthesis is installed in the acetabular cup prosthesis, so that the operation of the operation is more convenient and faster.
The contact surfaces of the acetabular cup prosthesis, the femoral head prosthesis and the prosthesis intermediate and the bone are all 3D printing bone trabecula structures, stress distribution is optimized, the maximum stress value is reduced obviously, the stress shielding effect is reduced, the increase of bones around the prosthesis is facilitated, the risk of loosening of the prosthesis is avoided, the biocompatibility and the mechanical property are good, particle residues are low, the metal ion precipitation amount is low, and adverse reactions of foreign body rejection, allergy and serious inflammation of a human body are avoided.
The acetabulum cup prosthesis, the femoral head prosthesis, the prosthesis intermediate, the pressure main nail and the Zhang Lifu nail are all made of zirconium-niobium alloy materials, the elastic modulus of the zirconium-niobium alloy materials is lower than that of the traditional cobalt-chromium-molybdenum alloy materials, stress shielding can be reduced, zirconia is formed by oxidizing the inner surface of the acetabulum cup prosthesis and the outer surface of the femoral head prosthesis, a good friction interface is formed between the inner surface of the acetabulum cup prosthesis and the outer surface of the femoral head prosthesis, the coating cannot fall off, and the wear resistance, the corrosion resistance and the lubrication degree are strong, so that the occurrence of prosthesis breakage and bone dissolution after joint replacement is reduced, and the zirconium-niobium alloy has the advantages of ideal biocompatibility and low sensitivity.
The rear end parts of the pressure main nail and the Zhang Lifu nail are connected with the prosthesis intermediate body, and the design of the pressure main nail and the Zhang Lifu nail can play a role in fixing and preventing rotation.
In the first specific embodiment, the prosthesis intermediate body is a bowl-shaped structure, the lower part of the bowl-shaped structure forms conical surface fit with the inner surface of the femoral head prosthesis, two threaded holes 2 are formed in the side surface of the bowl-shaped structure, the rear end parts of the pressure main nail and the Zhang Lifu nail are both in threaded connection with the prosthesis intermediate body at the threaded holes, and the front end parts of the pressure main nail and the Zhang Lifu nail are both provided with external threads.
The middle body of the prosthesis is of a bowl-shaped structure, the lower portion of the bowl-shaped structure is in conical surface fit with the inner surface of the femoral head prosthesis, two threaded holes are formed in the side face of the bowl-shaped structure, a pressure main nail and a tension auxiliary nail are crossed at the femoral neck, the structure simulates a pressure bone trabecula and a Zhang Ligu trabecula, the stress condition of a native bone is reduced as much as possible, a fixed shaft of the femoral head prosthesis adopts a mode of restoring a reconstructed fulcrum to the intersection of the proximal femur pressure trabecula and the Zhang Ligu trabecula, a physiological lever stress structure is formed, the stress design structure of the native bone is simulated, the prosthesis can be effectively prevented from loosening, the stress of the femoral neck is improved, and the probability of femoral neck fracture is reduced.
In the second specific embodiment, the prosthesis intermediate body is in a frustum shape and is matched with the inner surface of the femoral head prosthesis, zhang Lifu screw thread through holes are formed in the bottom surface of the frustum, the pressure main nail and the prosthesis intermediate body are integrally formed, the Zhang Lifu nail and the pressure main nail are in a full thread structure, and the rear end portion of the Zhang Lifu nail is installed in the screw thread hole of the prosthesis intermediate body Zhang Lifu.
The pressure main nail and the prosthesis intermediate are integrated, the pressure main nail and the prosthesis intermediate are installed simultaneously, the Zhang Lifu nail and the pressure main nail are of full-thread structures, the structure and the installation are relatively simple, the structural strength of the pressure main nail is high, and the system stability is high.
Furthermore, the pressure main nail is provided with an inclined insertion hole 5 at a position close to the femoral neck, and the Zhang Lifu nail penetrates through the inclined insertion hole and is arranged in a crossed manner with the pressure main nail.
The specific implementation method during the operation is as follows:
positioning the Kirschner wire: determining the position and the direction of a pressure main nail, and driving a Kirschner wire into the pressure main nail;
trimming the femoral head: trimming the femoral head as required;
measuring length: measuring the hole depth, and determining the length of the pressure main nail and the length of the Zhang Lifu nail;
installing a prosthesis intermediate: installing the prosthesis intermediate;
installing a pressure main nail: the pressure main nail is screwed in according to the direction of the Kirschner wire, the part of the front end of the nail, which exceeds the inclined hole, is a thread, the thread is matched with both cortical bone and cancellous bone, the stability is improved, the thread at the rear end is matched with the prosthesis intermediate body, and the outer end of the pressure main nail cannot exceed the outer surface of the prosthesis intermediate body, so that the installation and the stability of the femoral prosthesis are not influenced;
installing Zhang Lifu nail: the Zhang Lifu nail is screwed in according to the Zhang Lifu nail direction, the part of the nail, which exceeds the inclined hole, is threaded, the threads are matched with cortical bone and cancellous bone to increase stability, the threads at the rear end are matched with the prosthesis intermediate body, and the outer end of the Zhang Lifu nail cannot exceed the outer surface of the prosthesis intermediate body so as to avoid influencing the installation and stability of the femoral prosthesis;
installing a femoral head prosthesis: the femoral head prosthesis is connected with the prosthesis middle cone;
the femoral head prosthesis and the spherical surface of the acetabular cup prosthesis are installed in a matching way.
The bionic surface hip joint prosthesis is convenient for operation, a prosthesis intermediate is arranged to form conical surface connection with a femoral head prosthesis, operation is convenient through the arrangement of the pressure main nail and the Zhang Lifu nail, a native bone stress design structure can be well simulated, prosthesis loosening can be effectively prevented, femoral neck stress is improved, and the probability of femoral neck fracture is reduced.
Meanwhile, the predicted contact surfaces of the acetabular cup prosthesis, the femoral head prosthesis and the prosthesis intermediate are all 3D printed trabecular bone structures, so that the stress distribution is optimized, the maximum stress value is obviously reduced, the increase of bone around the prosthesis is facilitated, the risk of loosening of the prosthesis is avoided, the high biocompatibility and the mechanical property are realized, the particle residue is low, the metal ion precipitation amount is low, and the adverse reaction of foreign body rejection, allergy and serious inflammation of a human body is avoided.
And because the acetabular cup prosthesis and the femoral head prosthesis are made of zirconium-niobium alloy materials and the surfaces of the acetabular cup prosthesis and the femoral head prosthesis are oxidized, the wear resistance, the corrosion resistance and the lubrication degree of the acetabular cup prosthesis and the femoral head prosthesis are high, so that the occurrence of prosthesis breakage and osteolysis after joint replacement is reduced, and the zirconium-niobium alloy has the advantages of ideal biocompatibility and low sensitivity.
Finite element analysis was performed on the finite element models of the specific embodiment of the present invention and the control group as follows:
the control group was a conventional hip resurfacing prosthesis.
Finite element analysis is carried out on the finite element models of the first embodiment and the comparison group of the invention, as shown in fig. 5 and 6, the stress concentration range of the comparison group is 0.01-5.18 MPa, and the stress concentration range of the first embodiment is 0.01-4.22 MPa, so that the stress concentration range of the first embodiment is smaller, and the stress concentration damage of the prosthesis of the first embodiment to the human femur is small.
Finite element analysis is carried out on the finite element models of the second embodiment and the comparison group of the invention, as shown in fig. 5 and 7, the stress concentration range of the comparison group is 0.01-5.18 MPa, and the stress concentration range of the second embodiment is 0.01-4.97 MPa, so that the stress concentration range of the second embodiment is smaller, and the stress damage of the prosthesis of the second embodiment to the human femur is smaller.
Note: the figures of the present application do not show an acetabular cup prosthesis, which is prior art, having a similar configuration to the femoral head prosthesis, with an inner surface that mates with the outer surface of the femoral head prosthesis.
In conclusion, the bionic surface hip joint prosthesis is convenient for operation, has low friction coefficient and metal ion precipitation, has good long-term bone ingrowth performance, and can reconstruct the physiological fulcrum of the hip joint.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A bionic surface hip joint prosthesis convenient for surgical operation is characterized by comprising an acetabular cup prosthesis, a femoral head prosthesis, a prosthesis intermediate body, a pressure main nail and Zhang Lifu nails, wherein the femoral head prosthesis is arranged in the acetabular cup prosthesis, the inner surface of the acetabular cup prosthesis and the outer surface of the femoral head prosthesis are in hemispherical sliding friction fit, the prosthesis intermediate body is arranged in the femoral head prosthesis, the outer surface of the prosthesis intermediate body is matched with the inner surface of the femoral head prosthesis through a conical surface, the contact surfaces of the acetabular cup prosthesis, the femoral head prosthesis and the prosthesis intermediate body with bones are 3D printing trabecular bone structures, the rear end parts of the pressure main nail and the Zhang Lifu nails are connected with the prosthesis intermediate body, and the pressure main nail and the Zhang Lifu nails are crossed at a femoral neck.
2. The biomimetic type surface hip joint prosthesis convenient for surgical operation according to claim 1, wherein the acetabular cup prosthesis, the femoral head prosthesis, the prosthesis intermediate body, the pressure main nail and the Zhang Lifu nail are all zirconium-niobium alloy materials, and the inner surface of the acetabular cup prosthesis and the outer surface of the femoral head prosthesis are both oxidized to form a zirconium oxide friction interface.
3. The bionic surface hip joint prosthesis convenient for surgical operation according to claim 1, wherein the prosthesis intermediate is a bowl-shaped structure, the lower portion of the bowl-shaped structure forms a conical surface fit with the inner surface of the femoral head prosthesis, two threaded holes are formed in the side surface of the bowl-shaped structure, the rear end portions of the pressure main nail and the Zhang Lifu nail are in threaded connection with the prosthesis intermediate at the threaded holes, and the front end portions of the pressure main nail and the Zhang Lifu nail are provided with external threads.
4. The biomimetic type surface hip joint prosthesis convenient for surgical operation according to claim 1, wherein the prosthesis intermediate body is frustum-shaped and is matched with the inner surface of a femoral head prosthesis, zhang Lifu screw thread through holes are formed in the bottom surface of the frustum, the pressure main screw and the prosthesis intermediate body are integrally formed, external threads are arranged at the front end portion of the pressure main screw, the Zhang Lifu screw and the pressure main screw are of full thread structures, and the rear end portion of the Zhang Lifu screw is installed in the Zhang Lifu screw thread hole.
5. The biomimetic type surface hip joint prosthesis convenient for surgical operation according to claim 3 or 4, wherein the pressure main nail is provided with an inclined insertion hole at a position close to the femoral neck, and the Zhang Lifu nail penetrates through the inclined insertion hole and is arranged in a crossing manner with the pressure main nail.
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| FR2674122A1 (en) * | 1991-03-21 | 1992-09-25 | Super Patrick | Joint prosthesis, in particular for a joint of the enarthroidal type |
| GB9828085D0 (en) * | 1998-12-18 | 1999-02-17 | Benoist Girard & Cie | Femoral component |
| CN2616187Y (en) * | 2003-05-08 | 2004-05-19 | 施鲁孙 | Combined surface-replace artificial hip joint |
| CN103445886B (en) * | 2013-03-07 | 2016-01-06 | 刘礼初 | A kind of Biotype artificial hip joint superficial substitution prosthese |
| CN204169956U (en) * | 2014-05-21 | 2015-02-25 | 陈俊名 | Tool height dissects the neck of femur retaining device of laminating degree |
| ES2735007B2 (en) * | 2018-06-11 | 2020-07-17 | Desarrollos Biomecanicos Innovasan S L | Hip or shoulder prosthesis and placement instruments. |
| CN111265345A (en) * | 2020-04-12 | 2020-06-12 | 福建医科大学附属第一医院 | Hip joint prosthesis with prefabricated holes and method for conveniently treating periprosthetic fracture |
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