CN116269946A - Femoral head surface replacement prosthesis - Google Patents
Femoral head surface replacement prosthesis Download PDFInfo
- Publication number
- CN116269946A CN116269946A CN202310536666.8A CN202310536666A CN116269946A CN 116269946 A CN116269946 A CN 116269946A CN 202310536666 A CN202310536666 A CN 202310536666A CN 116269946 A CN116269946 A CN 116269946A
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- Prior art keywords
- rod
- prosthesis
- femoral head
- spherical
- sleeve
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- 230000008468 bone growth Effects 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 230000007423 decrease Effects 0.000 claims description 4
- 238000010146 3D printing Methods 0.000 claims description 3
- 230000007774 longterm Effects 0.000 abstract description 13
- 239000002639 bone cement Substances 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 2
- 210000000689 upper leg Anatomy 0.000 description 41
- 210000000988 bone and bone Anatomy 0.000 description 28
- 238000009434 installation Methods 0.000 description 15
- 238000002513 implantation Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 7
- 230000000149 penetrating effect Effects 0.000 description 5
- 210000002436 femur neck Anatomy 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 210000001624 hip Anatomy 0.000 description 3
- 210000004394 hip joint Anatomy 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 229910000684 Cobalt-chrome Inorganic materials 0.000 description 1
- 101000911772 Homo sapiens Hsc70-interacting protein Proteins 0.000 description 1
- 229910001182 Mo alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000010952 cobalt-chrome Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 210000003275 diaphysis Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000011540 hip replacement Methods 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003902 lesion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
- 238000011541 total hip replacement Methods 0.000 description 1
- 239000000602 vitallium Substances 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
- A61F2/32—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
- A61F2/30721—Accessories
- A61F2/30749—Fixation appliances for connecting prostheses to the body
-
- 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
-
- 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
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2002/30934—Special articulating surfaces
-
- 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
Landscapes
- 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 provides a femoral head surface replacement prosthesis, which comprises: the femoral head surface prosthesis comprises a spherical prosthesis and an intramedullary rod, wherein the first end of the intramedullary rod is connected with the spherical prosthesis; the fixed sleeve is sleeved outside the intramedullary rod and connected with the intramedullary rod, and the outer surface of the fixed sleeve is provided with a first porous structure. According to the technical scheme, the problem that the femoral head surface prosthesis and the femoral head of a patient are fixed by adopting bone cement in the related technology and the long-term stability of the femoral head surface prosthesis is poor can be solved.
Description
Technical Field
The invention relates to the technical field of femoral head surface prostheses, in particular to a femoral head surface replacement prosthesis.
Background
In the hip surface replacement surgery, a surface hip joint prosthesis is used for replacing a human hip joint lesion, and the surface hip joint prosthesis comprises an acetabular outer cup prosthesis and a femoral head surface prosthesis sleeved on a femoral head of a patient. Compared with total hip replacement, the method has the advantages that the complications and the revision rate after the hip replacement can be reduced by adopting the hip surface replacement operation, a large amount of bone mass is reserved for the total hip surface replacement operation, and a large amount of bone mass storage is provided for later revision.
In the related art, the femoral head surface prosthesis is made of cobalt-chromium-molybdenum alloy, and bone cement is used for fixing the femoral head surface prosthesis and the femoral head of a patient.
However, in the related art, the femoral head surface prosthesis and the femoral head of the patient are fixed with bone cement, so that the femoral head surface prosthesis has a problem of poor long-term stability.
Disclosure of Invention
The invention provides a femoral head surface replacement prosthesis, which aims to solve the problem that the femoral head surface prosthesis is poor in long-term stability when the femoral head surface prosthesis is fixed with bone cement and the femoral head of a patient in the related technology.
The invention provides a femoral head surface replacement prosthesis, which comprises: the femoral head surface prosthesis comprises a spherical prosthesis and an intramedullary rod, wherein the first end of the intramedullary rod is connected with the spherical prosthesis; the fixed sleeve is sleeved outside the intramedullary rod and connected with the intramedullary rod, and the outer surface of the fixed sleeve is provided with a first porous structure.
Further, the fixing sleeve is provided with a strip-shaped groove extending along the axial direction of the fixing sleeve, and the strip-shaped groove penetrates through the inner surface and the outer surface of the fixing sleeve; the outer side wall of the intramedullary rod is provided with a rotation stopping groove corresponding to the strip-shaped groove, and the rotation stopping groove and the strip-shaped groove extend in the same direction.
Further, a second porous structure is arranged on the groove wall of the rotation stopping groove, and the density of the second porous structure gradually decreases in the direction away from the spherical prosthesis; and/or at least two strip-shaped grooves are arranged on the fixed sleeve at intervals in the circumferential direction of the fixed sleeve, and at least two rotation stopping grooves which are in one-to-one correspondence with the at least two strip-shaped grooves are arranged on the intramedullary rod.
Further, a first inverted tooth structure is arranged on the outer side wall of the intramedullary rod, and a second inverted tooth structure which can be clamped with the first inverted tooth structure is arranged on the inner side wall of the fixed sleeve, so that the intramedullary rod can be unidirectionally inserted into the fixed sleeve; and/or the strip-shaped groove penetrates through the upper end of the fixing sleeve.
Further, the femoral head surface replacement prosthesis further comprises a puncture needle arranged on the fixed sleeve, a first end of the puncture needle is provided with a stop boss, a second end of the puncture needle movably penetrates through the fixed sleeve along the radial direction of the fixed sleeve, the stop boss is positioned in the fixed sleeve, the puncture needle has an extending position and a contracting position, and the intramedullary rod can drive the puncture needle to move from the contracting position to the extending position; when the puncture needle is in the stretching position, the stop boss is attached to the inner side wall of the fixed sleeve, the second end of the puncture needle protrudes out of the outer side wall of the fixed sleeve, and when the puncture needle is in the contracting position, the stop boss is separated from the inner side wall of the fixed sleeve, and the second end of the puncture needle is located on the inner side of the outer side wall of the fixed sleeve.
Further, the fixed sleeve is made of degradable metal; and/or, the intramedullary rod is provided with bone ingrowth holes extending radially therealong.
Further, the inner surface of the spherical prosthesis is provided with anti-rotation ribs which are axisymmetric structures symmetric relative to the axis of the intramedullary rod; the spherical prosthesis is connected with the intramedullary rod by screw thread or taper fit.
Further, the intramedullary rod includes: the first end of the first rod body is connected with the spherical prosthesis; the second body of rod is the contained angle setting with first body of rod, and the first end of second body of rod is connected with the second end of first body of rod is removable, and the second end of second body of rod wears to locate fixed sleeve and is connected with fixed sleeve.
Further, the second end of the first rod body is provided with a screw rod extending along the axial direction of the screw rod, the first end of the second rod body is provided with a spherical groove with a downward opening, the screw rod extends into the spherical groove, the inner wall of the spherical groove is a first spherical surface, the intramedullary rod further comprises a nut, the outer wall of the nut is a second spherical surface, the nut is sleeved on the screw rod and is in threaded connection with the screw rod, and the first spherical surface is matched with the second spherical surface; and/or the spherical prosthesis and the first rod body adopt an integrated structure, the inner surface of the spherical prosthesis is provided with a spiral rib, and the axis of the spiral rib is coincident with the axis of the first rod body.
Further, the femoral head surface replacement prosthesis also comprises a clamp spring sleeved on the fixing sleeve.
Further, the inner surface of the spherical prosthesis is provided with a third porous structure; and/or the fixed sleeve is integrally formed by 3D printing.
By applying the technical scheme of the invention, the femoral head surface replacement prosthesis comprises a femoral head surface prosthesis and a fixing sleeve, the fixing sleeve is firstly implanted into a femur, and then an intramedullary rod is arranged in the fixing sleeve in a penetrating manner and is connected with the fixing sleeve until the spherical prosthesis is covered on the femoral head of a patient, so that the installation of the femoral head surface replacement prosthesis is completed, the fixing sleeve is utilized to increase the structural strength of the part of the femoral head surface replacement prosthesis implanted into the femur, and as the outer surface of the fixing sleeve is provided with a first porous structure, the bone of a human body can grow into the first porous structure in the later stage of implantation, and the long-term stability of the installation between the fixing sleeve and the femur is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 illustrates a cross-sectional view of a femoral head resurfacing prosthesis provided in accordance with one embodiment of the present invention;
FIG. 2 illustrates a cross-sectional view of an intramedullary rod of a femoral head resurfacing prosthesis provided in accordance with one embodiment of the present invention;
fig. 3 shows a top view of a fixation sleeve of a femoral head resurfacing prosthesis provided in accordance with a first embodiment of the present invention;
fig. 4 shows a cross-sectional view of a fixation sleeve of a femoral head resurfacing prosthesis provided in accordance with a first embodiment of the present invention;
fig. 5 shows a cross-sectional view of a femoral head surface prosthesis provided in accordance with a first embodiment of the present invention;
FIG. 6 shows a schematic view of a femoral head resurfacing prosthesis for attachment to a femur, in accordance with a first embodiment of the present invention;
fig. 7 shows a cross-sectional view of a femoral head resurfacing prosthesis provided in accordance with a second embodiment of the present invention;
fig. 8 shows a cross-sectional view of a second stem of a femoral head resurfacing prosthesis provided in accordance with a second embodiment of the present invention;
fig. 9 shows a schematic view of a femoral head resurfacing prosthesis for attachment to a femur, provided in accordance with a second embodiment of the present invention.
Wherein the above figures include the following reference numerals:
10. a femoral head surface prosthesis; 11. a spherical prosthesis; 111. anti-spin ribs; 112. spiral ribs; 113. a third porous structure; 12. an intramedullary rod; 121. a rotation stopping groove; 1211. a second porous structure; 122. a first inverted tooth structure; 123. bone growth holes; 124. a first rod body; 1241. a screw; 125. a second rod body; 1251. a spherical groove; 126. a nut;
20. a fixed sleeve; 21. a first porous structure; 22. a bar-shaped groove; 23. a second inverted tooth structure;
30. femur; 31. a femoral neck; 32. a backbone; 33. femoral head.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one:
as shown in fig. 1 to 6, a femoral head resurfacing prosthesis is provided in accordance with a first embodiment of the present invention, the femoral head resurfacing prosthesis includes a femoral head resurfacing prosthesis 10 and a fixation sleeve 20, the femoral head resurfacing prosthesis 10 includes a spherical prosthesis 11 and an intramedullary rod 12, a first end of the intramedullary rod 12 is connected to the spherical prosthesis 11, a second end of the intramedullary rod 12 is inserted into the fixation sleeve 20 and connected to the fixation sleeve 20, and a first porous structure 21 is provided on an outer surface of the fixation sleeve 20.
The femoral head surface replacement prosthesis provided by the embodiment is applied, the femoral head surface replacement prosthesis comprises a femoral head surface prosthesis 10 and a fixing sleeve 20, the fixing sleeve 20 is firstly implanted into a femur 30, then an intramedullary rod 12 is arranged in the fixing sleeve 20 in a penetrating mode and is connected with the fixing sleeve 20 until a spherical surface prosthesis 11 is covered on a femoral head 33 of a patient, the installation of the femoral head surface replacement prosthesis is completed, the fixing sleeve 20 is used for increasing the partial structural strength of the femoral head surface replacement prosthesis implanted into the femur 30, and as the outer surface of the fixing sleeve 20 is provided with a first porous structure 21, human bone can grow into the first porous structure 21 in the later period of implantation, and the long-term stability of the installation between the fixing sleeve 20 and the femur 30 is improved.
In addition, the intramedullary rod 12 is arranged on the fixing sleeve 20 in a penetrating way and is connected with the fixing sleeve 20, the first porous structure 21 is arranged on the outer surface of the fixing sleeve 20, so that on the premise that the structural strength of the intramedullary rod 12 is not affected, the first porous structure 21 is utilized to increase the later stability of the part of the femoral head surface replacement prosthesis, which is implanted in the femur 30, and the later bone quality of the human body, and the part of the femoral head surface replacement prosthesis, which is implanted in the femur 30, is not required to be completely taken out when the femoral head surface replacement prosthesis 10 is replaced and maintained in the later period, the femoral head surface prosthesis 10 is required to be detached, the fixing sleeve 20 is still reserved in the femur 30, and the damage to the new bone growing in the first porous structure 21 is reduced.
It should be noted that the second end of the intramedullary rod 12 is inserted through the fixing sleeve 20 in the following three structures:
(1) The second end of the intramedullary rod 12 is positioned within the fixation sleeve 20;
(2) The second end of the intramedullary rod 12 is flush with the lower end of the fixation sleeve 20;
(3) The second end of the intramedullary rod 12 passes out of the lower end of the fixation sleeve 20.
As shown in fig. 2 to 4, the fixing sleeve 20 is provided with a bar-shaped groove 22 extending in the axial direction thereof, the bar-shaped groove 22 penetrates through the inner surface and the outer surface of the fixing sleeve 20, and a rotation stopping groove 121 corresponding to the bar-shaped groove 22 is provided on the outer side wall of the intramedullary rod 12, the rotation stopping groove 121 extending in the same direction as the bar-shaped groove 22. At a later stage of implantation, human bone can grow into the rotation-stopping groove 121 through the bar-shaped groove 22 to restrict rotation about the axis of the fixation sleeve 20 between the fixation sleeve 20, the intramedullary rod 12 and the femur 30.
As shown in fig. 2, the second porous structure 1211 is provided on the groove wall of the rotation stopping groove 121, and the density of the second porous structure 1211 gradually decreases in a direction away from the spherical prosthesis 11. Later in the implantation, human bone can grow into the second porous structure 1211, improving the long-term stability of the installation between the intramedullary rod 12 and the femur 30.
It should be noted that the gradual decrease in the density of the second porous structure 1211 in the direction away from the spherical prosthesis 11 means that the second porous structure 1211 gradually thins in the direction away from the spherical prosthesis 11, and the structural strength of the intramedullary rod 12 increases, so that the structural strength of the intramedullary rod 12 can accommodate the phenomenon of stress concentration at the second end of the intramedullary rod 12 during use.
As shown in fig. 2 and 3, the fixing sleeve 20 is provided with at least two bar grooves 22 spaced apart in the circumferential direction thereof, and the intramedullary rod 12 is provided with at least two rotation stopping grooves 121 in one-to-one correspondence with the at least two bar grooves 22. With the above-described at least two bar grooves 22 and at least two rotation stopping grooves 121, rotation about the axis of the fixation sleeve 20 between the fixation sleeve 20, the intramedullary rod 12, and the femur 30 can be further restricted by using new bone material that grows into the bar grooves 22 and rotation stopping grooves 121 at the later stage of implantation.
Specifically, the section obtained by cutting the intramedullary rod 12 in a plane perpendicular to the axis of the intramedullary rod 12 is a non-circular section such as a triangle, a quadrilateral, or the like.
As shown in fig. 1 and 4, the outer side wall of the intramedullary rod 12 is provided with a first inverted tooth structure 122, and the inner side wall of the fixing sleeve 20 is provided with a second inverted tooth structure 23 which can be clamped with the first inverted tooth structure 122, so that the intramedullary rod 12 can be unidirectionally inserted into the fixing sleeve 20. The fixing sleeve 20 is implanted into the femur 30, the intramedullary rod 12 is penetrated through the fixing sleeve 20, the second inverted tooth structure 23 moves downwards relative to the first inverted tooth structure 122, and when the second inverted tooth structure 23 has a trend of moving upwards relative to the first inverted tooth structure 122, the second inverted tooth structure 23 is in clamping fit with the first inverted tooth structure 122, so that the intramedullary rod 12 is limited to be pulled out relative to the fixing sleeve 20.
In this embodiment, a first inverted tooth structure 122 is disposed between two adjacent rotation stopping grooves 121, and a second inverted tooth structure 23 is disposed between two adjacent bar grooves 22.
As shown in fig. 4, a bar-shaped groove 22 penetrates the upper end of the fixing sleeve 20. In the later replacement and repair of the femoral head surface prosthesis 10, the opening size of the upper end of the strip-shaped groove 22 is enlarged from the upper end of the fixing sleeve 20, so that the distance between the inner side wall of the fixing sleeve 20 and the outer side wall of the intramedullary rod 12 is increased, the second inverted tooth structure 23 is separated from the first inverted tooth structure 122, the second inverted tooth structure 23 can move upwards relative to the first inverted tooth structure 122, the intramedullary rod 12 can be pulled out relative to the fixing sleeve 20, the implanted part of the femoral head surface replacement prosthesis is not required to be completely taken out, the fixing sleeve 20 is still reserved in the femur 30 only by detaching the femoral head surface prosthesis 10, and the damage to new bone growing into the first porous structure 21 is reduced.
In this embodiment, the femoral head surface replacement prosthesis further comprises a spike disposed on the fixed sleeve 20, a first end of the spike is provided with a stop boss, a second end of the spike is movably disposed through the fixed sleeve 20 along a radial direction of the fixed sleeve 20, the stop boss is disposed in the fixed sleeve 20, the spike has an extended position and a retracted position, the intramedullary rod 12 is capable of driving the spike to move from the retracted position to the extended position, wherein when the spike is in the extended position, the stop boss is attached to an inner side wall of the fixed sleeve 20, a second end of the spike protrudes from an outer side wall of the fixed sleeve 20, and when the spike is in the retracted position, the stop boss is separated from the inner side wall of the fixed sleeve 20, and a second end of the spike is disposed inside an outer side wall of the fixed sleeve 20. In the process of implanting the fixing sleeve 20 into the femur 30, the puncture needle is in a contracted position, the second end of the puncture needle does not protrude out of the outer side wall of the fixing sleeve 20, so that the fixing sleeve 20 can be smoothly implanted into the femur 30, in the process of penetrating the intramedullary rod 12 into the fixing sleeve 20, the intramedullary rod 12 is abutted with the stop boss, the intramedullary rod 12 drives the puncture needle to move outwards along the radial direction of the fixing sleeve 20, so that the puncture needle moves from the contracted position to the protruding position, the second end of the puncture needle protrudes out of the outer side wall of the fixing sleeve 20 and pierces the femur 30, and initial stability between the fixing sleeve 20 and the femur 30 is improved.
In other embodiments, the retaining sleeve 20 is made of cobalt chrome molybdenum alloy.
In this embodiment, the fixing sleeve 20 is made of degradable metal. In the later stage of implantation, the fixing sleeve 20 made of degradable metal can be degraded by the bone of a patient, and human bone can grow into the fixing sleeve 20 (the part provided with the first porous structure 21 and the part not provided with the first porous structure 21), so that the long-term stability of the installation between the fixing sleeve 20 and the femur 30 is further improved, in the earlier stage of implantation, the fixing sleeve 20 plays a role in occupying the new bone growing into the fixing sleeve 20 in the later stage, and plays a supporting role on the intramedullary rod 12 instead of the new bone in the later stage.
As shown in fig. 1, the intramedullary rod 12 is provided with bone growth holes 123 extending radially therealong. After the degradation of the fixation sleeve 20, new bone substance grows into the fixation sleeve 20 and penetrates into the inner side of the inner side wall of the fixation sleeve 20, and the new bone substance is in contact with the intramedullary rod 12, and by providing the bone growth holes 123, the new bone substance can further grow into the bone growth holes 123, so that the long-term stability between the intramedullary rod 12 and the femur 30 and the rotation stopping effect between the intramedullary rod 12 and the femur 30 are improved.
As shown in fig. 1, the spherical prosthesis 11 has an anti-rotation rib 111 on the inner surface, and the anti-rotation rib 111 has an axisymmetric structure that is symmetric with respect to the axis of the intramedullary rod 12. By providing the anti-rotation ribs 111 on the inner surface of the spherical prosthesis 11, rotation of the spherical prosthesis 11 about the axis of the intramedullary rod 12 relative to the femur 30 is restricted, improving initial stability between the spherical prosthesis 11 and the femur 30.
In this embodiment, the spherical prosthesis 11 is threaded or tapered to the intramedullary rod 12. By adopting the connecting mode, the spherical prosthesis 11 and the intramedullary rod 12 can be detachably connected, and after the femoral head surface prosthesis 10 is detached, the spherical prosthesis 11 or the intramedullary rod 12 can be independently replaced, so that the replacement cost is reduced.
As shown in fig. 1, the inner surface of the spherical prosthesis 11 is provided with a third porous structure 113. In the later stages of implantation, human bone can grow into the third porous structure 113, improving the long-term stability of the installation between the spherical prosthesis 11 and the femur 30.
In the present embodiment, the fixing sleeve 20 is integrally formed by 3D printing. So that the fixing sleeve 20 has the advantage of high processing efficiency.
As shown in fig. 6, in this embodiment, the fixation sleeve 20 is implanted within the femoral neck 31.
Embodiment two:
as shown in fig. 7 to 9, the second embodiment of the present invention provides a femoral head surface replacement prosthesis, which is different from the first embodiment in that in the second embodiment, the intramedullary rod 12 includes a first rod body 124 and a second rod body 125 disposed at an angle, the first end of the first rod body 124 is connected with the spherical prosthesis 11, the first end of the second rod body 125 is detachably connected with the second end of the first rod body 124, and the second end of the second rod body 125 is disposed through the fixing sleeve 20 and connected with the fixing sleeve 20.
Specifically, as shown in fig. 7, in the second embodiment, the intramedullary rod 12 includes a first rod body 124 and a second rod body 125, the first end of the first rod body 124 is connected to the spherical prosthesis 11, the second rod body 125 and the first rod body 124 are disposed at an included angle, the first end of the second rod body 125 is detachably connected to the second end of the first rod body 124, and the second end of the second rod body 125 is disposed through the fixing sleeve 20 and connected to the fixing sleeve 20. The fixing sleeve 20 is firstly implanted into the diaphysis 32, then the second end of the second rod body 125 is penetrated through the fixing sleeve 20 and is connected with the fixing sleeve 20, the first end of the second rod body 125 and the second end of the first rod body 124 are connected until the spherical prosthesis 11 is covered on the femoral head 33 of a patient, the installation of the femoral head surface replacement prosthesis is completed, the fixing sleeve 20 is utilized to increase the partial structural strength of the femoral head surface replacement prosthesis implanted into the femur 30, and as the outer surface of the fixing sleeve 20 is provided with the first porous structure 21, the bone of a human body can grow into the first porous structure 21 in the later implantation period, and the long-term stability of the installation between the fixing sleeve 20 and the femur 30 is improved.
And, because the second body of rod 125 is the contained angle setting with first body of rod 124, when the structural strength of patient's femoral neck 31 does not satisfy the installation demand of femoral head surface replacement prosthesis, through implanting fixed sleeve 20 to backbone 32, wear to locate fixed sleeve 20 and be connected with fixed sleeve 20 with the second end of second body of rod 125, implant the first body of rod 124 in the femoral neck 31, connect the first end of second body of rod 125 and the second end of first body of rod 124 to utilize the structural strength of patient's backbone 32 to install femoral head surface replacement prosthesis.
It should be noted that, the second end of the second rod 125 is inserted into the fixing sleeve 20 and includes the following three structures:
(1) The second end of the second rod 125 is located within the stationary sleeve 20;
(2) The second end of the second rod 125 is flush with the lower end of the fixing sleeve 20;
(3) The second end of the second rod 125 passes through the lower end of the fixing sleeve 20.
As shown in fig. 7, the second end of the first rod 124 is provided with a screw rod 1241 extending along the axial direction thereof, the first end of the second rod 125 is provided with a spherical groove 1251 with a downward opening, the screw rod 1241 extends into the spherical groove 1251, the inner wall of the spherical groove 1251 is a first spherical surface, the intramedullary rod 12 further comprises a nut 126, the outer wall of the nut 126 is a second spherical surface, the nut 126 is sleeved on the screw rod 1241 and is in threaded connection with the screw rod 1241, and the first spherical surface is matched with the second spherical surface. Through stretching into spherical recess 1251 with screw rod 1241, nut 126 is located spherical recess 1251 to nut 126 cover is established on screw rod 1241 and with screw rod 1241 threaded connection, in order to realize the dismantlement of first body of rod 124 and second body of rod 125 and because the inner wall of spherical recess 1251 is first sphere, the outer wall of nut 126 is the second sphere, first sphere and second sphere cooperation can be when connecting first body of rod 124 and second body of rod 125, finely tune the contained angle between first body of rod 124 and the second body of rod 125 according to actual demand.
As shown in fig. 7, the spherical prosthesis 11 and the first rod 124 are integrally formed, the spiral rib 112 is disposed on the inner surface of the spherical prosthesis 11, and the axis of the spiral rib 112 coincides with the axis of the first rod 124. With the above-described integrally formed structure, and the screw rib 112 is provided on the inner surface of the spherical prosthesis 11, when the first rod 124 is rotated about its axis relative to the second rod 125, the spherical prosthesis 11 is screwed with the femoral head 33 by the screw rib 112, and the initial stability of the connection between the spherical prosthesis 11 and the femoral head 33 is improved.
The axis of the spiral rib 112 refers to the rotation axis of the spiral structure in which the spiral rib 112 is located.
In this embodiment, the femoral head resurfacing prosthesis further comprises a snap spring which is sleeved on the fixing sleeve 20.
With the femoral head surface replacement prosthesis provided in this embodiment, a model is first installed on the femoral head 33, the installation position of the femoral head surface replacement prosthesis is positioned, then a hole is drilled on the femoral head 33, the fixing sleeve 20 is first implanted into the femur 30, and then the intramedullary rod 12 is inserted into the fixing sleeve 20 and connected with the fixing sleeve 20 until the spherical prosthesis 11 covers the femoral head 33 of the patient, thereby completing the installation of the femoral head surface replacement prosthesis.
The device provided by the embodiment has the following beneficial effects:
(1) The fixing sleeve 20 is utilized to increase the structural strength of the part of the femoral head surface replacement prosthesis implanted in the femur 30, and as the first porous structure 21 is arranged on the outer surface of the fixing sleeve 20, human bone can grow into the first porous structure 21 in the later stage of implantation, so that the long-term stability of the installation between the fixing sleeve 20 and the femur 30 is improved;
(2) At the later stage of implantation, human bone can grow into the rotation stopping groove 121 through the bar-shaped groove 22 so as to limit the rotation between the fixed sleeve 20, the intramedullary rod 12 and the femur 30 around the axis of the fixed sleeve 20;
(3) At a later stage of implantation, human bone can grow into the second porous structure 1211, improving long-term stability of the installation between the intramedullary rod 12 and the femur 30, the second porous structure 1211 gradually becoming sparse in a direction away from the spherical prosthesis 11, the structural strength of the intramedullary rod 12 rising, so that the structural strength of the intramedullary rod 12 can accommodate the phenomenon of stress concentration at the second end of the intramedullary rod 12 during use;
(4) The fixed sleeve 20 is implanted into the femur 30, the intramedullary rod 12 is penetrated through the fixed sleeve 20, the second inverted tooth structure 23 moves downwards relative to the first inverted tooth structure 122, and when the second inverted tooth structure 23 has a trend of moving upwards relative to the first inverted tooth structure 122, the second inverted tooth structure 23 is in clamping fit with the first inverted tooth structure 122, so that the intramedullary rod 12 is limited to be pulled out relative to the fixed sleeve 20;
(5) In the later replacement and repair of the femoral head surface prosthesis 10, the opening size of the upper end of the strip-shaped groove 22 is enlarged from the upper end of the fixing sleeve 20, so that the distance between the inner side wall of the fixing sleeve 20 and the outer side wall of the intramedullary rod 12 is increased, the second inverted tooth structure 23 is separated from the first inverted tooth structure 122, the second inverted tooth structure 23 can move upwards relative to the first inverted tooth structure 122, the intramedullary rod 12 can be pulled out relative to the fixing sleeve 20, the implanted part of the femoral head surface replacement prosthesis is not required to be completely taken out, the fixing sleeve 20 is still reserved in the femur 30 only by detaching the femoral head surface prosthesis 10, and the damage to new bone growing into the first porous structure 21 is reduced;
(6) In the process of implanting the fixing sleeve 20 into the femur 30, the puncture needle is in a contracted position, the second end of the puncture needle does not protrude out of the outer side wall of the fixing sleeve 20, so that the fixing sleeve 20 can be smoothly implanted into the femur 30, in the process of penetrating the intramedullary rod 12 into the fixing sleeve 20, the intramedullary rod 12 is abutted with the stop boss, the intramedullary rod 12 drives the puncture needle to move outwards along the radial direction of the fixing sleeve 20, so that the puncture needle moves from the contracted position to an extended position, and the second end of the puncture needle protrudes out of the outer side wall of the fixing sleeve 20 and pierces the femur 30, so that the initial stability between the fixing sleeve 20 and the femur 30 is improved;
(7) In the later stage of implantation, the fixing sleeve 20 made of degradable metal can be degraded by the bone of a patient, and human bone can grow into the fixing sleeve 20 (the part provided with the first porous structure 21 and the part not provided with the first porous structure 21), so that the long-term stability of the installation between the fixing sleeve 20 and the femur 30 is further improved, in the earlier stage of implantation, the fixing sleeve 20 plays a role in occupying the new bone growing into the fixing sleeve 20 in the later stage, and plays a supporting role on the intramedullary rod 12 instead of the new bone in the later stage.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A femoral head resurfacing prosthesis, the femoral head resurfacing prosthesis comprising:
femoral head surface prosthesis (10) comprising a spherical prosthesis (11) and an intramedullary rod (12), a first end of the intramedullary rod (12) being connected to the spherical prosthesis (11);
the fixed sleeve (20) is sleeved outside the intramedullary rod (12) and connected with the intramedullary rod (12), and a first porous structure (21) is arranged on the outer surface of the fixed sleeve (20).
2. The femoral head resurfacing prosthesis of claim 1,
the fixing sleeve (20) is provided with a strip-shaped groove (22) extending along the axial direction of the fixing sleeve, and the strip-shaped groove (22) penetrates through the inner surface and the outer surface of the fixing sleeve (20);
the outer side wall of the intramedullary rod (12) is provided with a rotation stopping groove (121) corresponding to the strip-shaped groove (22), and the rotation stopping groove (121) and the strip-shaped groove (22) extend in the same direction.
3. The femoral head resurfacing prosthesis of claim 2,
a second porous structure (1211) is arranged on the groove wall of the rotation stopping groove (121), and the density of the second porous structure (1211) gradually decreases in a direction away from the spherical prosthesis (11); and/or the number of the groups of groups,
at least two strip-shaped grooves (22) are formed in the fixing sleeve (20) at intervals in the circumferential direction of the fixing sleeve, and at least two rotation stopping grooves (121) which are in one-to-one correspondence with the at least two strip-shaped grooves (22) are formed in the intramedullary rod (12).
4. The femoral head resurfacing prosthesis of claim 2,
a first inverted tooth structure (122) is arranged on the outer side wall of the intramedullary rod (12), and a second inverted tooth structure (23) which can be clamped with the first inverted tooth structure (122) is arranged on the inner side wall of the fixed sleeve (20), so that the intramedullary rod (12) can be unidirectionally inserted into the fixed sleeve (20); and/or the number of the groups of groups,
the strip-shaped groove (22) penetrates through the upper end of the fixing sleeve (20).
5. The femoral head resurfacing prosthesis according to any of claims 1 to 4, further comprising a spike provided on the fixation sleeve (20), a first end of the spike being provided with a stop boss, a second end of the spike being movably threaded in the fixation sleeve (20) in a radial direction of the fixation sleeve (20), the stop boss being located within the fixation sleeve (20), the spike having an extended position and a retracted position, the intramedullary rod (12) being capable of driving the spike from the retracted position to the extended position;
when the puncture needle is in the extending position, the stop boss is attached to the inner side wall of the fixed sleeve (20), the second end of the puncture needle protrudes out of the outer side wall of the fixed sleeve (20), when the puncture needle is in the contracting position, the stop boss is separated from the inner side wall of the fixed sleeve (20), and the second end of the puncture needle is located inside the outer side wall of the fixed sleeve (20).
6. The femoral head resurfacing prosthesis of any of claims 1 to 4,
the fixed sleeve (20) is made of degradable metal; and/or the number of the groups of groups,
the intramedullary rod (12) is provided with a bone growth hole (123) extending along the radial direction thereof.
7. The femoral head resurfacing prosthesis of any of claims 1 to 4,
the inner surface of the spherical prosthesis (11) is provided with anti-rotation ribs (111), and the anti-rotation ribs (111) are of axisymmetric structures which are symmetric relative to the axis of the intramedullary rod (12);
the spherical prosthesis (11) and the intramedullary rod (12) are connected by screw threads or taper fittings.
8. The femoral head resurfacing prosthesis according to any of claims 1 to 4, wherein the intramedullary rod (12) comprises:
a first rod body (124), a first end of the first rod body (124) being connected to the spherical prosthesis (11);
the second body of rod (125), second body of rod (125) with first body of rod (124) are the contained angle setting, the first end of second body of rod (125) with the second end of first body of rod (124) is removable to be connected, the second end of second body of rod (125) wears to locate fixed sleeve (20) and with fixed sleeve (20) are connected.
9. The femoral head resurfacing prosthesis of claim 8,
the second end of the first rod body (124) is provided with a screw rod (1241) extending along the axial direction of the first rod body, the first end of the second rod body (125) is provided with a spherical groove (1251) with a downward opening, the screw rod (1241) stretches into the spherical groove (1251), the inner wall of the spherical groove (1251) is a first spherical surface, the intramedullary rod (12) further comprises a nut (126), the outer wall of the nut (126) is a second spherical surface, the nut (126) is sleeved on the screw rod (1241) and is in threaded connection with the screw rod (1241), and the first spherical surface is matched with the second spherical surface; and/or the number of the groups of groups,
the spherical prosthesis (11) and the first rod body (124) adopt an integrated structure, a spiral rib (112) is arranged on the inner surface of the spherical prosthesis (11), and the axis of the spiral rib (112) is coincident with the axis of the first rod body (124).
10. The femoral head resurfacing prosthesis according to claim 8, further comprising a snap spring which fits over the fixation sleeve (20).
11. The femoral head resurfacing prosthesis of any of claims 1 to 4,
the inner surface of the spherical prosthesis (11) is provided with a third porous structure (113); and/or the number of the groups of groups,
the fixed sleeve (20) is integrally formed by 3D printing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310536666.8A CN116269946B (en) | 2023-05-12 | 2023-05-12 | Femoral head surface replacement prosthesis |
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| CN202310536666.8A CN116269946B (en) | 2023-05-12 | 2023-05-12 | Femoral head surface replacement prosthesis |
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| CN116269946B CN116269946B (en) | 2023-10-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116807694A (en) * | 2023-08-25 | 2023-09-29 | 北京爱康宜诚医疗器材有限公司 | Femoral head prosthetic prosthesis |
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| CN116807694A (en) * | 2023-08-25 | 2023-09-29 | 北京爱康宜诚医疗器材有限公司 | Femoral head prosthetic prosthesis |
| CN116807694B (en) * | 2023-08-25 | 2023-12-19 | 北京爱康宜诚医疗器材有限公司 | Femoral head prosthetic prosthesis |
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|---|---|
| CN116269946B (en) | 2023-10-27 |
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