CN115227462B - Acetabular screw and acetabular prosthesis - Google Patents
Acetabular screw and acetabular prosthesis Download PDFInfo
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- CN115227462B CN115227462B CN202210785541.4A CN202210785541A CN115227462B CN 115227462 B CN115227462 B CN 115227462B CN 202210785541 A CN202210785541 A CN 202210785541A CN 115227462 B CN115227462 B CN 115227462B
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- 210000000988 bone and bone Anatomy 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 22
- 230000013011 mating Effects 0.000 claims description 44
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 230000007423 decrease Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 241000587161 Gomphocarpus Species 0.000 description 10
- 230000033001 locomotion Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000002513 implantation Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 208000006386 Bone Resorption Diseases 0.000 description 1
- 102000004127 Cytokines Human genes 0.000 description 1
- 108090000695 Cytokines Proteins 0.000 description 1
- 206010048886 Onychoclasis Diseases 0.000 description 1
- 208000003076 Osteolysis Diseases 0.000 description 1
- 206010052306 Periprosthetic osteolysis Diseases 0.000 description 1
- 208000037099 Prosthesis Failure Diseases 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- ZQBZAOZWBKABNC-UHFFFAOYSA-N [P].[Ca] Chemical compound [P].[Ca] ZQBZAOZWBKABNC-UHFFFAOYSA-N 0.000 description 1
- 230000024279 bone resorption Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 210000004394 hip joint Anatomy 0.000 description 1
- 210000004969 inflammatory cell Anatomy 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000003902 lesion Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 208000029791 lytic metastatic bone lesion Diseases 0.000 description 1
- 210000002540 macrophage Anatomy 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010883 osseointegration Methods 0.000 description 1
- 238000007745 plasma electrolytic oxidation reaction Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000011541 total hip replacement Methods 0.000 description 1
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
- A61F2/46—Special tools for implanting artificial joints
- A61F2/4644—Preparation of bone graft, bone plugs or bone dowels, e.g. grinding or milling bone material
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/32—Joints for the hip
- A61F2/34—Acetabular cups
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/32—Joints for the hip
- A61F2/34—Acetabular cups
- A61F2002/3412—Acetabular cups with pins or protrusions, e.g. non-sharp pins or protrusions projecting from a shell surface
Landscapes
- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Transplantation (AREA)
- Vascular Medicine (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Cardiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Physical Education & Sports Medicine (AREA)
- Prostheses (AREA)
Abstract
The invention discloses an acetabular screw and an acetabular prosthesis, wherein the acetabular screw comprises a first nail body and a second nail body, the first nail body can be connected to an acetabular cup, the second nail body can be connected with the first nail body in a matched manner, and the second nail body can be matched in bone outside the acetabular cup. The acetabular screw comprises the first screw body and the second screw body which are mutually independent and can be connected in a matched mode, different manufacturing materials can be selected for the first screw body and the second screw body according to requirements, the connection strength of the first screw body is considered, meanwhile, the elastic modulus of the second screw body can be matched with that of an outer bone, the stress shielding effect is eliminated, the phenomenon of broken screw is avoided, and the first screw body and the second screw body can be matched adaptively according to actual requirements for different bones, so that the stock quantity of the first screw body and the second screw body can be reduced, and the universality of the acetabular screw is improved.
Description
Technical Field
The invention relates to the technical field of medical equipment, in particular to an acetabular screw and an acetabular prosthesis.
Background
Artificial joint replacement is an effective method of treating large joint lesions throughout the body. Currently, there are more than 100 tens of thousands of total hip replacements worldwide each year, but about 20% of patients experience prosthetic loosening, mainly due to peri-prosthetic osteolysis. Currently, the accepted mechanisms leading to bone dissolution around the prosthesis are: the joint prosthesis components between different materials have long-term friction in joint movement, so that a large amount of abrasion particles are generated, the particles migrate between the interface of the bone and the prosthesis, and inflammatory cells such as macrophages in the local environment are induced to secrete various cytokines, so that the surrounding bone around the prosthesis is dissolved. At present, when artificial hip joint replacement is clinically carried out, acetabular screws are adopted for auxiliary fixation of the acetabular cup, redundant screw holes are plugged by plugging nuts, so that migration of abrasion particles around the prosthesis is limited, and prosthesis loosening caused by osteolysis can be effectively prevented.
The acetabular screw in the related art is of an integrated structure, and the structural form is applied to joint replacement, for example, according to different bone materials at the acetabular position, the acetabular screw is required to have enough large adjustable implantation angles in a certain range, different specification lengths are required, the size of the adjustable angle of the acetabular screw is related to the size of the nut, when the integral acetabular screw cannot be matched with the required adjustment angle, the integral acetabular screw is required to be replaced integrally, and when the length of the acetabular screw cannot be matched with the required specification, the integral acetabular screw is required to be replaced integrally, so that the acetabular screw is low in universality and high in stock requirement, and in addition, the acetabular screw of the integral structure is difficult to be matched with the bone materials at different positions, stress shielding is easy to occur, and the screw breakage phenomenon is caused.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the problems in the related art.
Therefore, the first nail body and the second nail body of the acetabular screw are mutually independent structural members, the first nail body and the second nail body can be separately processed, processing time is saved, different manufacturing materials are conveniently selected by the first nail body and the second nail body according to requirements, the connection strength of the first nail body is considered, meanwhile, the elastic modulus of the second nail body can be matched with an outer bone, the stress shielding effect is eliminated, the phenomenon of broken nails is avoided, and in addition, when the acetabular screw is aimed at different bones, the first nail body and the second nail body can be adaptively matched according to actual requirements, so that stock quantity of the first nail body and the second nail body can be reduced, and the universality of the acetabular screw is improved.
Embodiments of the present invention also provide an acetabular prosthesis.
The acetabular screw is characterized by comprising a first screw body and a second screw body, wherein the first screw body can be connected to an acetabular cup, the second screw body can be connected with the first screw body in a matched mode, and the second screw body can be matched in bone outside the acetabular cup.
According to the acetabular screw provided by the embodiment of the application, the first screw body can be connected to the acetabular cup, the second screw body can be connected with the first screw body in a matched manner, and the second screw body can be matched in the bone outside the acetabular cup
In some embodiments, the second pin is made of an absorbable material; and/or the first pin body is made of a non-absorbable material.
In some embodiments, the first pin is provided with a first mating portion that is injection molded with the second pin.
In some embodiments, the first mating portion is a mating protrusion and the second pin has a mating hole into which the mating protrusion may mate. In some embodiments, the outer peripheral surface of the matching bulge is provided with a plurality of convex rings which are arranged at intervals along the length direction; and/or the outer peripheral surface of the matching projection is provided with a porous coating.
In some embodiments, the fitting projection is provided with a projection structure that is fitted with the fitting hole in a circumferential direction of the fitting projection.
In some embodiments, the mating protrusion has a cross-sectional profile that is a cross-shaped structure; or, the mating protrusion is a spiral structure to form the protrusion structure; or, the cross-section outline of the matched bulge is a straight structure so as to form the bulge structure; or, the convex structure is a plurality of round tables which are arranged at intervals along the axial direction of the matched convex; or, the cross-section profile of the matching bulge is a polygonal structure so as to form the bulge structure; or, the protruding structure is a plurality of protruding blocks which are arranged at intervals along the circumferential direction of the matched protruding.
In some embodiments, the first pin body further comprises a pin head, the pin head is capable of being matched in a screw hole of the acetabular cup and connected with the first matching part, and the side surface of the pin head facing the first matching part is a cambered surface protruding towards the first matching part.
In some embodiments, the acetabular screw further comprises a neck connected with the head and the mating protrusion is connected to a side of the neck away from the head, a cross-sectional area of the neck is greater than a cross-sectional area of the mating protrusion, and a side of the neck away from the head is configured to abut against the second shank.
In some embodiments, the outer diameter of the neck is less than the smallest inner diameter of the screw hole of the acetabular cup.
In some embodiments, the first pin body includes a pin head connected with an end of the first mating portion remote from the second pin body, the pin head mated within and in threaded connection with a screw hole of the acetabular cup; and/or the side surface of the matching convex block, which faces the second nail body, is a cambered surface protruding towards the second nail body.
The acetabular prosthesis comprises an acetabular cup, wherein a screw hole is formed in the acetabular cup, and the acetabular screw described in the embodiment is arranged in the screw hole.
According to the acetabular prosthesis provided by the embodiment of the invention, the acetabular screw is arranged on the acetabular cup as the connecting piece, so that the acetabular prosthesis is stable to install and small in stress shielding, and the service life of the acetabular prosthesis is convenient to recover after operation and prolonged.
Drawings
Fig. 1 is a schematic structural view of an acetabular screw according to an embodiment of the invention.
Fig. 2 is a schematic structural view of a first pin body of an acetabular screw according to one embodiment of the invention.
Fig. 3 is a schematic view of the first shank of an acetabular screw according to another embodiment of the invention.
Fig. 4 is a schematic view of the structure of a first shank of an acetabular screw according to yet another embodiment of the invention.
Fig. 5 is a schematic view of the structure of a first shank of an acetabular screw according to yet another embodiment of the invention.
Fig. 6 is a schematic view of the first shank of an acetabular screw according to another embodiment of the invention.
Fig. 7 is a schematic view of the structure of a first shank of an acetabular screw according to yet another embodiment of the invention.
Fig. 8 is a schematic structural view of an acetabular screw according to another embodiment of the invention.
Reference numerals:
The first nail body 1, the nail head 11, the neck 12, the matching bulge 13, the convex ring 131, the matching convex block 14, the second nail body 2, the matching clamping groove 21 and the acetabular cup 3.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
As shown in fig. 1, the acetabular screw according to the embodiment of the invention comprises a first screw body 1 and a second screw body 2, wherein the first screw body 1 can be connected to an acetabular cup 3, the second screw body 2 can be connected with the first screw body 1 in a matching way, and the second screw body 2 can be matched in bone outside the acetabular cup 3. In other words, an acetabular screw may be driven from the acetabular cup 3 into the lateral bone to assist in securing the acetabular cup 3.
In the early joint motion, the artificial joint replacement technique requires the fixation by the application of acetabular screws because bone resorption is caused by the micro motion of the cup, which leads to instability of the cup. According to different bone materials at different positions, the required length and the adjustable implantation range of the acetabular screw are different, the acetabular screw comprises a first screw body 1 and a second screw body 2, the types of the first screw body 1 and the second screw body 2 can be selected to be matched adaptively according to actual requirements, for example, the first screw body 1 can be matched with the second screw body 2 with different lengths according to the requirements, or the second screw body 2 can be matched with the first screw body 1 with different types according to the requirements.
In addition, since the second pin body 2 is driven into the outer bone, there is a problem in that the second pin body 2 has a high elastic modulus during the growth of the outer bone of the acetabular cup 3, resulting in stress shielding and thus breaking of the pin. The second pin body 2 of the application can be processed independently, and the material selection is not influenced by the structures such as the first pin body 1, so that the material with lower elastic modulus can be selected according to the requirement, thereby eliminating the stress shielding effect and avoiding the occurrence of current broken pins.
According to the acetabular screw provided by the embodiment of the application, the first screw body 1 can be connected to the acetabular cup 3, the second screw body 2 can be matched and connected with the first screw body 1, and the second screw body 2 can be matched and connected in the bone outside the acetabular cup 3, because the first screw body 1 and the second screw body 2 are mutually independent and matched and connected structural members, the first screw body 1 and the second screw body 2 can be separately processed, the processing time is saved, meanwhile, different manufacturing materials are conveniently selected by the first screw body 1 and the second screw body 2 according to the requirements, the connection strength of the first screw body 1 is considered, meanwhile, the elastic modulus of the second screw body 2 can be matched with the bone outside, the stress shielding effect is eliminated, and the broken screw phenomenon is avoided.
Preferably, the second pin body 2 is made of an absorbable material. Therefore, the acetabular screw can fix the acetabular cup 3 in the early stage to keep stable, and after the acetabular cup 3 reaches self-stability through bone ingrowth and the like, the second screw body 2 can be absorbed, so that the stress on the acetabular cup 3 is reduced.
Preferably, the first pin 1 is made of a non-absorbable material. Therefore, the degradation rate of the absorbable material at the position is accelerated due to micro motion of the first nail body 1, so that the screw is fixed and stabilized in the early stage. In this embodiment, the material of the first nail body 1 is metal.
Further, the first nail body 1 is provided with a first matching part, and the first matching part is in injection molding connection with the second nail body 2. Specifically, when processing, can process first nail body 1 earlier, then through the injection moulding with absorbable material into second nail body 2 in the position of the first cooperation portion of first nail body 1 to can guarantee the connection stability of first nail body 1 and second nail body 2, and processing manufacturing is simple and convenient. In other embodiments, the first pin 1 and the second pin 2 may be manufactured separately and connected by bonding or other means.
Further, as shown in fig. 1 and 2, the first engaging portion is an engaging protrusion 13, and the second pin body 2 has an engaging hole into which the engaging protrusion 13 is engageable. It can be understood that the first pin 1 is fitted in the fitting hole of the second pin 2 by being the fitting protrusion 13, when the second pin 2 is connected to the first pin 1 by injection molding, the fitting protrusion 13 can be placed in the injection mold, and the second pin 2 is injection molded on the fitting protrusion 13, so that the connection stability of the first pin 1 and the second pin 2 can be ensured.
Alternatively, as shown in fig. 3 to 6, the cross-sectional area of the fitting projection 13 gradually decreases in a direction toward the second pin body 2. In other words, the engaging protrusion 13 gradually contracts in a direction toward the second pin 2, which is advantageous for the second pin 2 to absorb and then relieve stress when the acetabular cup 3 is jogged, and for facilitating removal when the acetabular cup 3 is reworked. Alternatively, the structure of the fitting projection 13 is not limited to that shown in fig. 3 to 6, and for example, as shown in fig. 7, the fitting projection 13 may be a polyhedral structure extending straight. It will be appreciated that when the shape of the mating protrusion 13 changes, the mating hole of the second pin body 2 will change to the same shape as the mating protrusion 13 to mate with the mating protrusion 13.
Alternatively, as shown in fig. 2, a plurality of convex rings 131 are provided on the outer peripheral surface of the fitting projection 13 at intervals along the length direction thereof. Therefore, the convex ring 131 can be used for increasing the axial pulling force on the second nail body 2, increasing the anti-pulling force of the acetabular screw and ensuring the stability of fixing the acetabular cup 3. Alternatively, the fitting projection 13 is not limited to that shown in fig. 2, and for example, as shown in fig. 3 and 4, the fitting projection 13 may not be provided with the collar 131.
Optionally, the fitting projection 13 is provided with a projection structure that is fitted with the fitting hole in the circumferential direction of the fitting projection 13 to increase the torsion force with the projection structure.
Alternatively, as shown in fig. 2 and 4, the cross-sectional profile of the fitting projection 13 is a cross-shaped structure to constitute a projection structure. Thus, the mating projections 13 of the cross-shaped configuration provide sufficient torque to the second pin 2 when the second pin 2 is rotatably implanted in the acetabular cup 3.
In this embodiment, since the cross-section profile of the mating protrusion 13 is in a cross-shaped structure and is provided with the convex ring 131, the outer peripheral surface of the mating protrusion 13 forms a groove structure, and when the second nail body 2 of the absorbable material is degraded and absorbed, the newly-grown bone can grow into the groove, thereby further ensuring the fixing effect of the first nail body 1 on the acetabular cup.
Alternatively, the outer circumferential surface of the mating protrusion 13 has a porous coating, so that the surface friction and contact area of the mating protrusion 13 can be increased, and the connection tightness of the mating surface of the mating protrusion 13 and the second pin body 2 can be improved. Specifically, the coating may be a sprayed titanium coating, a calcium-phosphorus ceramic coating, or the like, or the outer peripheral surface of the mating protrusion 13 may be treated by a surface treatment method such as micro-arc oxidation.
Alternatively, the fitting projection 13 is not limited to a cross-shaped structure, and as shown in fig. 6 and 7, the fitting projection 13 may also be a spiral-shaped structure to form a projection structure.
In another embodiment, as shown in fig. 3, the cross-sectional profile of the mating protrusion 13 is a straight-line structure to form a protrusion structure.
In another embodiment, as shown in fig. 5, the projection structure is a plurality of lands arranged at intervals in the axial direction of the fitting projection 13.
In another embodiment, as shown in fig. 7, the cross-sectional profile of the mating protrusion 13 is a polygonal structure to form a protrusion structure.
In another embodiment, as shown in fig. 8, the projection structure is a plurality of projections arranged at intervals along the circumferential direction of the fitting projection 13. Alternatively, the protruding structure may be other structures, which are not described herein.
In some embodiments, as shown in fig. 1 and 2, the first pin body 1 further comprises a pin head 11, the pin head 11 is fittable into a screw hole of the acetabular cup 3 and is connected with the fitting protrusion 13, and a side of the pin head 11 facing the fitting protrusion 13 is a cambered surface protruding toward the fitting protrusion 13. When the acetabular screw is applied, the nail head 11 is matched in the screw hole of the acetabular cup 3, and the matching surface of the nail head 11 is arranged to be an arc surface, so that the acetabular screw can be matched with a screw hole ball socket, the screw can move in a small range in a universal way, and the stress is automatically eliminated.
Further, as shown in fig. 2, the acetabular screw further comprises a neck 12, the neck 12 is connected with the nail head 11, the matching projection 13 is connected to one side of the neck 12 far away from the nail head 11, the sectional area of the neck 12 is larger than that of the matching projection 13, and one side of the neck 12 far away from the nail head 11 can be stopped against the second nail body 2. Thus, the neck 12 may serve as a limiting structure to limit the assembly position of the second pin 2 when the fitting protrusion 13 is fitted with the second pin 2.
In practical application, the diameter of the neck 12 is smaller than the diameter of a screw hole of the acetabular cup, the diameter of the matched boss is smaller than the diameter of the second nail body 2, so that the screw can move in a small-angle universal manner within the range of the nail hole, the size of the nail head 11 is smaller than the size of a screw hole and a ball socket of the acetabular cup 3, and in the small-range universal movement, the nail head 11 is sunk in the screw hole all the time, so that the stress can be automatically eliminated, the osseointegration is realized, and friction between the first nail body 1 and a cup, a lining and the like due to free movement can be avoided.
Further, the acetabular screw of the application is not limited to that shown in fig. 1 and 2, and for example, as shown in fig. 8, one of the side of the first fitting portion facing the second pin body 2 and the side of the second pin body 2 facing the first fitting portion is provided with a fitting projection 14, and the other is provided with a fitting neck 21 fitted with the fitting projection 14. Specifically, as shown in fig. 8, a side surface of the first engaging portion facing the second pin body 2 is provided with a plurality of engaging projections 14 arranged at intervals along the circumferential direction thereof, and the second pin body 2 is provided with a plurality of engaging catching grooves 21 arranged at intervals along the circumferential direction thereof.
Further, as shown in fig. 8, a connecting thread is provided on the outer circumferential surface of the nail head 11, and the nail head 11 is fitted into the screw hole of the acetabular cup 3, so that the joint with the screw hole can be realized by the connecting thread, thereby ensuring the reliability of the connection between the first nail body 1 and the acetabular cup 3.
Further, as shown in fig. 8, the side of the mating bump 14 facing the second pin 2 is a cambered surface protruding toward the second pin 2. It will be appreciated that the outer peripheral surface of the acetabular cup 3 is arcuate, such as when the second pin 2 is of an absorbable material, the outer side of the mating protrusion 13 may be substantially flush with the outer peripheral surface of the acetabular cup 3 after the second pin 2 is absorbed, without any stress shielding due to micro movement of the acetabular cup 3.
The acetabular prosthesis comprises the acetabular cup, wherein the acetabular cup is provided with the screw hole, and the acetabular screw of the embodiment is arranged in the screw hole.
According to the acetabular prosthesis provided by the embodiment of the invention, the acetabular screw is arranged on the acetabular cup as the connecting piece, so that the acetabular prosthesis is stable to install and small in stress shielding, and the service life of the acetabular prosthesis is convenient to recover after operation and prolonged.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (11)
1. The acetabular screw is characterized by comprising a first screw body and a second screw body, wherein the first screw body can be connected to an acetabular cup, the second screw body is connected with the first screw body in a matched manner, and the second screw body can be matched in bone outside the acetabular cup;
The second nail body is made of an absorbable material;
and the first pin body is made of non-absorbable material;
The first nail body is provided with a first matching part, the first matching part is a matching bulge, the cross section area of the matching bulge gradually decreases along the direction towards the second nail body, the second nail body is provided with a matching hole, and the matching bulge can be matched in the matching hole.
2. The acetabular screw of claim 1, wherein the first mating portion is injection-molded with the second pin.
3. The acetabular screw according to claim 2, wherein the outer peripheral surface of the mating boss is provided with a plurality of convex rings spaced apart along the length thereof;
And/or the outer peripheral surface of the matching projection is provided with a porous coating.
4. The acetabular screw of claim 3, wherein the mating protrusion is provided with a protrusion structure that mates with the mating hole along a circumference of the mating protrusion.
5. The acetabular screw of claim 4, wherein the mating boss has a cross-sectional profile that is cross-shaped to form the boss structure;
or, the mating protrusion is a spiral structure to form the protrusion structure;
or, the cross-section outline of the matched bulge is a straight structure so as to form the bulge structure;
or, the convex structure is a plurality of round tables which are arranged at intervals along the axial direction of the matched convex;
Or, the cross-section profile of the matching bulge is a polygonal structure so as to form the bulge structure;
or, the protruding structure is a plurality of protruding blocks which are arranged at intervals along the circumferential direction of the matched protruding.
6. The acetabular screw of claim 2, wherein the first body further comprises a head that fits within a screw hole of the acetabular cup and is connected to the first mating portion, and a side of the head facing the first mating portion is a cambered surface that protrudes toward the first mating portion.
7. The acetabular screw of claim 6, further comprising a neck connected to the head and having the first mating portion connected to a side of the neck away from the head, the neck having a cross-sectional area greater than a cross-sectional area of the mating protrusion, and the side of the neck away from the head being configured to abut the second shank.
8. The acetabular screw of claim 7, wherein an outer diameter of the neck is less than a minimum inner diameter of a screw hole of the acetabular cup.
9. The acetabular screw of claim 2, wherein one of the sides of the first mating portion facing the second pin and the sides of the second pin facing the first mating portion is provided with a mating projection and the other is provided with a mating detent adapted to the mating projection.
10. The acetabular screw of claim 9, wherein the first pin body includes a pin head connected to an end of the first mating portion remote from the second pin body, the pin head mated within and threadably connected to a screw hole of the acetabular cup;
And/or the side surface of the matching convex block, which faces the second nail body, is a cambered surface protruding towards the second nail body.
11. An acetabular prosthesis comprising an acetabular cup, wherein the acetabular cup is provided with screw holes, and wherein the screw holes are internally provided with the acetabular screw according to any one of claims 1-10.
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| CN202210785541.4A CN115227462B (en) | 2022-07-05 | 2022-07-05 | Acetabular screw and acetabular prosthesis |
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| CN202210785541.4A CN115227462B (en) | 2022-07-05 | 2022-07-05 | Acetabular screw and acetabular prosthesis |
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| CN115227462B true CN115227462B (en) | 2024-07-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115886968A (en) * | 2022-12-28 | 2023-04-04 | 中国人民解放军陆军军医大学第二附属医院 | Cup Lateral Fixation Blocking Screws |
| CN118121371B (en) * | 2024-05-08 | 2024-07-12 | 吉林大学 | Self-adaptive pile group pile cap acetabular prosthesis |
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| FR2682588A1 (en) * | 1991-10-22 | 1993-04-23 | Lepine Groupe | Acetabular implant |
| WO2021180076A1 (en) * | 2020-03-10 | 2021-09-16 | 昶盛(物料应用制品)有限公司 | Screw assembly for bone fixation, and bone fixation device |
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| EP1596765A2 (en) * | 2003-02-10 | 2005-11-23 | Smith & Nephew, Inc. | Resorbable devices |
| US8449585B2 (en) * | 2009-11-05 | 2013-05-28 | K2M, Inc. | Semi-constrained bone screw |
| US8313531B2 (en) * | 2010-03-08 | 2012-11-20 | Hip Innovation Technology Llc | Interlocking reverse hip prosthesis and method |
| JP2013526375A (en) * | 2010-05-18 | 2013-06-24 | スミス アンド ネフュー インコーポレーテッド | Revision hip implant and prosthesis system |
| US20130218214A1 (en) * | 2012-01-16 | 2013-08-22 | Carbofix Orthopedics Ltd. | Bone screw head design |
| US9204978B2 (en) * | 2012-05-29 | 2015-12-08 | Zimmer, Inc. | Modular screw apparatus and method |
| CN203777104U (en) * | 2013-12-27 | 2014-08-20 | 长庚医疗财团法人林口长庚纪念医院 | Universal interlocking acetabular reinforcer |
| DE102018101657A1 (en) * | 2018-01-25 | 2019-07-25 | Aesculap Ag | Medical bone screw and implant system |
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| FR2682588A1 (en) * | 1991-10-22 | 1993-04-23 | Lepine Groupe | Acetabular implant |
| WO2021180076A1 (en) * | 2020-03-10 | 2021-09-16 | 昶盛(物料应用制品)有限公司 | Screw assembly for bone fixation, and bone fixation device |
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