CN111888055A - Femur distal prosthesis with retained epiphysis - Google Patents
Femur distal prosthesis with retained epiphysis Download PDFInfo
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- CN111888055A CN111888055A CN202010781562.XA CN202010781562A CN111888055A CN 111888055 A CN111888055 A CN 111888055A CN 202010781562 A CN202010781562 A CN 202010781562A CN 111888055 A CN111888055 A CN 111888055A
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- 210000000689 upper leg Anatomy 0.000 title claims abstract description 35
- 210000002745 epiphysis Anatomy 0.000 title abstract description 14
- 230000000717 retained effect Effects 0.000 title description 2
- 210000000988 bone and bone Anatomy 0.000 claims abstract description 100
- 239000007787 solid Substances 0.000 claims abstract description 15
- WSNMPAVSZJSIMT-UHFFFAOYSA-N COc1c(C)c2COC(=O)c2c(O)c1CC(O)C1(C)CCC(=O)O1 Chemical compound COc1c(C)c2COC(=O)c2c(O)c1CC(O)C1(C)CCC(=O)O1 WSNMPAVSZJSIMT-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 5
- 239000011148 porous material Substances 0.000 claims description 5
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 4
- 239000011149 active material Substances 0.000 claims description 4
- 230000001788 irregular Effects 0.000 claims description 4
- 239000007769 metal material Substances 0.000 claims description 4
- 239000011701 zinc Substances 0.000 claims description 4
- 229910052725 zinc Inorganic materials 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000007774 longterm Effects 0.000 description 8
- 210000001694 thigh bone Anatomy 0.000 description 7
- 230000002980 postoperative effect Effects 0.000 description 5
- 230000005484 gravity Effects 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 238000010146 3D printing Methods 0.000 description 2
- 206010021703 Indifference Diseases 0.000 description 2
- 239000002639 bone cement Substances 0.000 description 2
- 230000008468 bone growth Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 210000003275 diaphysis Anatomy 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 108010048734 sclerotin Proteins 0.000 description 2
- 208000010392 Bone Fractures Diseases 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 210000000629 knee joint Anatomy 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
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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
- A61F2/38—Joints for elbows or knees
- A61F2/3859—Femoral components
-
- 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
- A61F2/3094—Designing or manufacturing processes
- A61F2/30942—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
-
- 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
- A61F2002/30518—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements with possibility of relative movement between the prosthetic parts
- A61F2002/30528—Means for limiting said movement
-
- 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
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
- A61F2002/30772—Apertures or holes, e.g. of circular cross section
- A61F2002/30784—Plurality of holes
-
- 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
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2002/3093—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth for promoting ingrowth of bone tissue
-
- 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
- A61F2/3094—Designing or manufacturing processes
- A61F2/30942—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
- A61F2002/30948—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques using computerized tomography, i.e. CT scans
-
- 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
- A61F2/3094—Designing or manufacturing processes
- A61F2002/30985—Designing or manufacturing processes using three dimensional printing [3DP]
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- Health & Medical Sciences (AREA)
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- Orthopedic Medicine & Surgery (AREA)
- Heart & Thoracic Surgery (AREA)
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- Transplantation (AREA)
- Cardiology (AREA)
- Biomedical Technology (AREA)
- Veterinary Medicine (AREA)
- Vascular Medicine (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Physical Education & Sports Medicine (AREA)
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- Manufacturing & Machinery (AREA)
- Prostheses (AREA)
Abstract
The invention relates to the technical field of medical instruments, and provides a distal femoral prosthesis with epiphysis preserved. The method comprises the following steps: a distal femoral prosthesis and a broach shell, the distal femoral prosthesis and the broach shell being tapered; the femur far-end prosthesis is provided with a lower end face, a lower end bulge is arranged on the lower end face, and a trabecular bone structure III is arranged on the surface of the lower end bulge; the intramedullary nail is sleeved with a solid inner wall, and a bone trabecula structure II is arranged on the surface of the solid inner wall. The invention has the beneficial effects that: the lower end bulge is customized in size according to the medullary cavity of a patient, is matched with the medullary cavity of the patient, can realize quick positioning in an operation, prevents the prosthesis from shifting forwards and backwards after the operation, and avoids the prosthesis from damaging the bone of the patient. The surface of the lower end bulge is provided with a bone trabecula structure III, so that the contact area of the prosthesis and human bone is increased, the number of places where bones grow in is increased, the prosthesis is more stable and firm, and dislocation is not easy to occur.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a distal femoral prosthesis with epiphysis preserved.
Background
In the prior art, chinese patent CN2016167123U discloses a joint-surface-preserving assembled femoral tumor knee joint prosthesis, which includes a distal femoral prosthesis, a movable locking plate, a medullary cavity extension handle, a femoral shaft extension section and locking screws, wherein the medullary cavity extension handle is fixed on the femoral shaft extension section, the distal femoral prosthesis is arranged at the lower part of the femoral shaft extension section, the movable locking plate is arranged on the distal femoral prosthesis, and the movable locking plate and the distal femoral prosthesis are fixed by the locking screws. The end face of the lower part of the distal femur prosthesis, which is connected with the epiphysis, is provided with a trabecular bone porous structure with the thickness of 1-5mm, one side of the distal femur prosthesis is provided with an integrated locking plate, the integrated locking plate is provided with a conical screw hole for connecting the epiphysis, the distal femur prosthesis is provided with a baffle plate for preventing the prosthesis from falling off backwards in the knee bending process at a position close to the position between condyles, the distal femur prosthesis is provided with an anti-rotation clamping groove and a tapered round hole for connecting a diaphysis extension section, the distal femur prosthesis is provided with an anti-rotation clamping groove structure and a tapered round hole structure, and the end face of the lower part of the distal femur prosthesis, which. The end face of the movable locking nail plate connected with the epiphysis is provided with a layer of bone trabecula porous structure with the thickness of 1-5mm, the movable locking plate is provided with 6 threaded holes, wherein three threaded holes at one end are conical threaded holes, the three conical threaded holes are matched with locking bone screws connected to the femoral condyle, the three threaded holes at the other end are stepped unthreaded holes, and the three stepped unthreaded holes are provided with fixing screws connected to the distal prosthesis of the femur. One end of the femoral medullary cavity extension handle is provided with an anti-rotation clamping platform and a conical boss which are used for connecting the backbone extension section, the other end of the femoral medullary cavity extension handle is a long rod with physiological curvature, and an arc transition section is arranged at the joint of the lower part of the femoral medullary cavity extension handle and the anti-rotation clamping platform. One end of the diaphysis extension section is provided with an anti-rotation flat square and conical interface for connecting the distal femoral prosthesis, and the other end is provided with an anti-rotation groove and a conical hole interface for connecting the femoral medullary cavity extension handle. The locking bone screw is provided with tapered threads, cancellous bone threads, a self-tapping groove and a nail cap hexagon socket. But it still has the following drawbacks:
(1) the distal femur prosthesis realizes long-term biological fixation only by a layer of trabecular bone porous structure between the prosthesis and the osteotomy surface, the contact area is small, and the stable biological fixation needs longer time; (2) the trabecular bone porous structure in the prosthesis is a single structure, the bone condition of a human body is complex, a special trabecular bone porous structure is not designed according to different bone ingrowth requirements, the bone ingrowth time is slow, and the long-term biological fixation time is long; (3) the prosthesis is fixed with the nails only by the wing plates at the two sides, the prosthesis is not well positioned when being installed in the operation, and the prosthesis is easy to deviate after the operation; (4) the fixing of the prosthesis broach section adopts bone cement or biological fixing, which is not beneficial to long-term stability, the bone cement is harmful to the health of patients, and the long-term stability of the biological fixing is not firm; (5) the nail driving direction in the prosthesis is transverse, and the nail driving direction is influenced by gravity, so that the nail driving direction is large in bearing shearing force and easy to break; (6) the femoral prosthesis is provided with the movable locking nail plate, so that the operation steps are increased, and the two-body structure is fixed only by the screws, so that the long-term falling risk exists, and the long-term stability is insufficient.
Disclosure of Invention
The invention aims to provide a distal femur prosthesis with preserved epiphysis, which solves the technical problems in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that: a distal femoral epiphysis-preserving prosthesis comprising: a distal femoral prosthesis and a broach shell, the distal femoral prosthesis and the broach shell being tapered; the femur far-end prosthesis is provided with a lower end face, a lower end bulge is arranged on the lower end face, and a trabecular bone structure III is arranged on the surface of the lower end bulge; the intramedullary nail is sleeved with a solid inner wall, and a bone trabecula structure II is arranged on the surface of the solid inner wall.
In an optional embodiment, a bone trabecular structure four is arranged on the lower end surface, the thicknesses of the bone trabecular structure two, the bone trabecular structure three and the bone trabecular structure four are 1-3mm, the pore diameter is 300-400 μm, and the porosity is 50-60%.
In an optional embodiment, the outer side of the distal femoral prosthesis close to the osteotomy face prosthesis is provided with a first trabecular structure with the height of 10-15mm and the thickness of 1-3mm, the aperture of the first trabecular structure is 100-200 μm, and the porosity is 70-75%.
In an alternative embodiment, the surfaces of the first bone trabecular structure, the second bone trabecular structure, the third bone trabecular structure and the fourth bone trabecular structure are sprayed with HA active material or zinc.
In an alternative embodiment, the cross-sectional shapes of the first bone trabecular structure, the second bone trabecular structure, the third bone trabecular structure and the fourth bone trabecular structure are irregular polygon shapes.
In an alternative embodiment, the distal end of the distal femoral prosthesis is of unitary construction with the osteotomy face prosthesis.
In an optional embodiment, the root of the intramedullary nail of the distal femoral prosthesis is provided with an anti-rotation groove, and the groove depth of the anti-rotation groove is 1-3 mm.
In an optional embodiment, the bottom of the sheath is provided with an anti-rotation wing with a size of 1-3mm, and the anti-rotation wing is matched with the anti-rotation groove.
In an alternative embodiment, the thickness of the solid inner wall is 1-3 mm.
In an alternative embodiment, the distal femoral prosthesis and the broach shell are both 3D printed using a titanium alloy metallic material.
The invention has the beneficial effects that:
(1) the lower end bulge is arranged in the femur far-end prosthesis, the size of the lower end bulge is customized according to the medullary cavity of a patient, the lower end bulge is matched with the medullary cavity of the patient, the rapid positioning in the operation can be realized, the forward and backward deviation of the prosthesis after the operation is prevented, and the bone of the patient is prevented from being damaged by the prosthesis. The surface of the lower end bulge is provided with a bone trabecula structure III, so that the contact area of the prosthesis and human bone is increased, the number of places where bones grow in is increased, the prosthesis is more stable and firm, and dislocation is not easy to occur.
(2) The outer side of the distal femur prosthesis close to the osteotomy surface prosthesis is provided with the bone trabecula structure I, so that bone can climb along the surface of the bone trabecula structure I on the outer surface of the prosthesis, and the stability of the prosthesis is improved. The femur prosthesis and the distal osteotomy face prosthesis are of an integrated structure, and the postoperative stability is stronger.
(3) The root of the broach of the distal femoral prosthesis is provided with an anti-rotation groove, the bottom of the broach sleeve is provided with an anti-rotation wing, and the anti-rotation wing is matched with the anti-rotation groove to prevent relative movement of the two parts.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a first schematic structural diagram of a distal femur prosthesis with preserved epiphysis according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of an overall structure of a distal femur prosthesis with preserved epiphysis according to an embodiment of the present invention.
Fig. 3 is a schematic structural view of a broach shell according to an embodiment of the present invention.
Wherein, the reference numbers in the figures are: 1. the bone fracture surface comprises a femur far-end prosthesis 11, a lower end protrusion 12, a trabecular bone structure I, a bone cutting surface prosthesis 13, an anti-rotation groove 14, a lower end surface 15, a broach sleeve 2, a broach sleeve 21, a trabecular bone structure II, a bone inner wall 22, a solid inner wall 23 and an anti-rotation wing.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in 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.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and not to be construed as limiting the technical solution. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.
Example one
Referring to fig. 1-3, the present embodiment provides a distal femur prosthesis with preserved epiphysis, including: femur distal end prosthesis 1 and broach cover 2, femur distal end prosthesis 1 is joined in marriage with broach cover 2 awl, femur distal end prosthesis 1 and broach cover 2 all adopt titanium alloy metal material 3D to print, the prosthesis is according to patient CT data, utilize reverse principle to carry out three-dimensional reconstruction and go out femur distal end data, can carry out the mirror image according to good side data, replace the thighbone distal end of suffering from side, realize indifference recovery this patient's the thighbone distal end of suffering from side, it prints out femur distal end prosthesis 1 through 3D printing technique, realize customizing individuation thighbone distal end prosthesis 1.
Wherein, the root of the broach of the distal femoral prosthesis 1 is provided with an anti-rotation groove 14, preferably, the groove depth of the anti-rotation groove 14 is 1mm, the bottom of the broach sleeve 2 is provided with an anti-rotation wing 23 with the size of 1mm, and the anti-rotation wing 23 is matched with the anti-rotation groove 14 to prevent the relative movement of the distal femoral prosthesis 1 and the broach sleeve 2.
It should be pointed out that distal femoral prosthesis 1 is equipped with down terminal surface 15, is equipped with lower extreme arch 11 on lower terminal surface 15, and lower extreme arch 11 matches patient's pulp cavity according to patient's pulp cavity customization size, can realize intraoperative quick location, prevents that postoperative prosthesis from squinting, avoids the prosthesis to harm patient's sclerotin. The surface of the lower end bulge 11 is provided with a third bone trabecular structure, the lower end surface 15 is provided with a fourth bone trabecular structure, preferably, the thickness of the third bone trabecular structure and the fourth bone trabecular structure is 1mm, the aperture is 300 mu m, and the porosity is 50%; the bone trabecula structure increases the contact area between the prosthesis and human bone, can realize the increase of bone in-growth places, and has more stable and firm prosthesis and difficult dislocation.
Specifically, the broach shell 2 is provided with a solid inner wall 22, the thickness of the solid inner wall 22 is 1mm, the surface of the solid inner wall 22 is provided with a bone trabecular structure II 21, preferably, the thickness of the bone trabecular structure II 21 is 1mm, the aperture is 300 μm, and the porosity is 50%; it should be pointed out that the prosthesis can realize the rapid bone growth by means of the bone trabecula structure two 21 outside the medullary needle sleeve 2 and matching with the pressure of the human body, so as to form more stable intramedullary fixation and improve the stability of the prosthesis.
In addition, the distal end of the distal femoral prosthesis 1 and the osteotomy face prosthesis 13 are of an integral structure, so that the postoperative stability is stronger; the outer side of the distal femur prosthesis 1 close to the osteotomy face prosthesis 13 is provided with a trabecular structure I12 with the height of 10mm and the thickness of 1mm, the aperture of the trabecular structure I12 is 100 mu m, the porosity is 70 percent, and bone can climb along the surface of the trabecular structure I12 on the outer surface of the prosthesis, so that the stability of the prosthesis is improved.
Furthermore, HA active materials or zinc are sprayed on the surfaces of the first bone trabecular structure 12, the second bone trabecular structure 21, the third bone trabecular structure and the fourth bone trabecular structure, so that bone ingrowth is promoted, and the long-term stability of the prosthesis in a human body is improved. It is worth mentioning that the cross sections of the first bone trabecular structure 12, the second bone trabecular structure 21, the third bone trabecular structure and the fourth bone trabecular structure are irregular polygons, so that the bone trabecular structures are closer to the bone trabeculae of the human body, the bone of the human body can grow into the pores quickly, and the bone trabecular structures and the residual bone tissues of the human body can be fused and fixed quickly.
When the femur distal prosthesis with the preserved epiphysis is used, the nail is driven in the obliquely downward direction, the stress direction is close to the gravity direction, the shearing force and the component force are small, and the initial stability is not affected.
Example two
Referring to fig. 1-3, the present embodiment provides a distal femur prosthesis with preserved epiphysis, including: femur distal end prosthesis 1 and broach cover 2, femur distal end prosthesis 1 is joined in marriage with broach cover 2 awl, femur distal end prosthesis 1 and broach cover 2 all adopt titanium alloy metal material 3D to print, the prosthesis is according to patient CT data, utilize reverse principle to carry out three-dimensional reconstruction and go out femur distal end data, can carry out the mirror image according to good side data, replace the thighbone distal end of suffering from side, realize indifference recovery this patient's the thighbone distal end of suffering from side, the thighbone distal end prosthesis is printed out through 3D printing technique, realize customizing individuation thighbone distal end prosthesis.
Wherein, the root of the broach of the distal femoral prosthesis 1 is provided with an anti-rotation groove 14, preferably, the groove depth of the anti-rotation groove 14 is 3mm, the bottom of the broach sleeve 2 is provided with an anti-rotation wing 23 with the size of 3mm, and the anti-rotation wing 23 is matched with the anti-rotation groove 14 to prevent the relative movement of the distal femoral prosthesis 1 and the broach sleeve 2.
It should be pointed out that distal femoral prosthesis 1 is equipped with down terminal surface 15, is equipped with lower extreme arch 11 on lower terminal surface 15, and lower extreme arch 11 matches patient's pulp cavity according to patient's pulp cavity customization size, can realize intraoperative quick location, prevents that postoperative prosthesis from squinting, avoids the prosthesis to harm patient's sclerotin. The surface of the lower end bulge 11 is provided with a third bone trabecular structure, the lower end surface 15 is provided with a fourth bone trabecular structure, preferably, the thickness of the third bone trabecular structure and the fourth bone trabecular structure is 3mm, the aperture is 400 mu m, and the porosity is 60%; the bone trabecula structure increases the contact area between the prosthesis and human bone, can realize the increase of bone in-growth places, and has more stable and firm prosthesis and difficult dislocation.
Specifically, the broach shell 2 is provided with a solid inner wall 22, the thickness of the solid inner wall 22 is 3mm, the surface of the solid inner wall 22 is provided with a second trabecular bone structure 21, preferably, the thickness of the second trabecular bone structure 21 is 3mm, the aperture is 400 μm, and the porosity is 60%; it should be pointed out that the prosthesis can realize the rapid bone growth by means of the bone trabecula structure two 21 outside the medullary needle sleeve 2 and matching with the pressure of the human body, so as to form more stable intramedullary fixation and improve the stability of the prosthesis.
In addition, the distal end of the distal femoral prosthesis 1 and the osteotomy face prosthesis 13 are of an integral structure, so that the postoperative stability is stronger; the outer side of the distal femur prosthesis 1 close to the osteotomy face prosthesis 13 is provided with a trabecular structure I12 with the height of 15mm and the thickness of 3mm, the aperture of the trabecular structure I12 is 200 mu m, the porosity is 75%, and bone can climb along the surface of the trabecular structure I12 on the outer surface of the prosthesis, so that the stability of the prosthesis is improved.
Furthermore, HA active materials or zinc are sprayed on the surfaces of the first bone trabecular structure 12, the second bone trabecular structure 21, the third bone trabecular structure and the fourth bone trabecular structure, so that bone ingrowth is promoted, and the long-term stability of the prosthesis in a human body is improved. It is worth mentioning that the cross sections of the first bone trabecular structure 12, the second bone trabecular structure 21, the third bone trabecular structure and the fourth bone trabecular structure are irregular polygons, so that the bone trabecular structures are closer to the bone trabeculae of the human body, the bone of the human body can grow into the pores quickly, and the bone trabecular structures and the residual bone tissues of the human body can be fused and fixed quickly.
When the femur distal prosthesis with the preserved epiphysis is used, the nail is driven in the obliquely downward direction, the stress direction is close to the gravity direction, the shearing force and the component force are small, and the initial stability is not affected.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A distal femoral epiphysis-preserving prosthesis comprising: the femoral distal prosthesis comprises a femoral distal prosthesis (1) and a broach sleeve (2), wherein the femoral distal prosthesis (1) is in taper fit with the broach sleeve (2);
the method is characterized in that: the femur far-end prosthesis (1) is provided with a lower end face (15), a lower end protrusion (11) is arranged on the lower end face (15), and a trabecular bone structure III is arranged on the surface of the lower end protrusion (11); the broach sleeve (2) is provided with a solid inner wall (22), and the surface of the solid inner wall (22) is provided with a bone trabecula structure II (21).
2. The epiphyseal distal femoral prosthesis according to claim 1, wherein the lower end face (15) is provided with a trabecular bone structure four, the thickness of the trabecular bone structure two (21), the trabecular bone structure three and the trabecular bone structure four is 1-3mm, the pore diameter is 300-400 μm, and the porosity is 50-60%.
3. The epiphyseal distal femoral prosthesis according to claim 2, wherein the outer side of the distal femoral prosthesis (1) near the osteotomy face prosthesis (13) has a trabecular structure one (12) with a height of 10-15mm and a thickness of 1-3mm, the trabecular structure one (12) has a pore size of 100-200 μm and a porosity of 70% -75%.
4. The epiphyseal distal femoral prosthesis of claim 3, wherein the surface of the first (12), second (21), third and fourth bone trabecular structures is coated with HA active material or zinc.
5. The epiphyseal distal femoral prosthesis of claim 3, wherein the cross-sectional shape of the first (12), second (21), third and fourth bone trabecular structures is an irregular polygonal shape.
6. Epiphyseal distal femoral prosthesis according to claim 3, characterized in that the distal end of the distal femoral prosthesis (1) is of one piece construction with the osteotomy plane prosthesis (13).
7. Epiphyseal distal femoral prosthesis according to claim 1, characterized in that the shank of the broach of the distal femoral prosthesis (1) is provided with an anti-rotation groove (14), the groove depth of the anti-rotation groove (14) being 1-3 mm.
8. Epiphyseal distal femoral prosthesis according to claim 7, characterized in that the bottom of the sheath (2) is provided with an anti-rotation wing (23) with a size of 1-3mm, the anti-rotation wing (23) cooperating with the anti-rotation groove (14).
9. Epiphyseal distal femoral prosthesis according to claim 1, characterized in that the thickness of the solid inner wall (22) is 1-3 mm.
10. Epiphyseal femoral distal prosthesis according to claim 1, characterized in that the femoral distal prosthesis (1) and the broach shell (2) are both 3D printed with titanium alloy metal material.
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| CN202010781562.XA CN111888055A (en) | 2020-08-06 | 2020-08-06 | Femur distal prosthesis with retained epiphysis |
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| CN202010781562.XA CN111888055A (en) | 2020-08-06 | 2020-08-06 | Femur distal prosthesis with retained epiphysis |
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