ITMI20110417A1 - DEVICE FOR COATING THE HEAD OF THE FEMORE - Google Patents
DEVICE FOR COATING THE HEAD OF THE FEMORE Download PDFInfo
- Publication number
- ITMI20110417A1 ITMI20110417A1 IT000417A ITMI20110417A ITMI20110417A1 IT MI20110417 A1 ITMI20110417 A1 IT MI20110417A1 IT 000417 A IT000417 A IT 000417A IT MI20110417 A ITMI20110417 A IT MI20110417A IT MI20110417 A1 ITMI20110417 A1 IT MI20110417A1
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- IT
- Italy
- Prior art keywords
- femur
- rod
- head
- screw
- prosthesis
- Prior art date
Links
- 239000011248 coating agent Substances 0.000 title claims description 26
- 238000000576 coating method Methods 0.000 title claims description 26
- 210000000689 upper leg Anatomy 0.000 claims description 42
- 210000001624 hip Anatomy 0.000 claims description 16
- 210000004197 pelvis Anatomy 0.000 claims description 6
- 210000002436 femur neck Anatomy 0.000 description 10
- 210000000988 bone and bone Anatomy 0.000 description 4
- 238000001356 surgical procedure Methods 0.000 description 4
- 238000011541 total hip replacement Methods 0.000 description 4
- 206010017076 Fracture Diseases 0.000 description 3
- 201000010099 disease Diseases 0.000 description 3
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 206010023204 Joint dislocation Diseases 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 210000000501 femur body Anatomy 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 208000010392 Bone Fractures Diseases 0.000 description 1
- 206010011732 Cyst Diseases 0.000 description 1
- 208000007446 Hip Dislocation Diseases 0.000 description 1
- 206010031264 Osteonecrosis Diseases 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000000788 chromium alloy Substances 0.000 description 1
- 208000031513 cyst Diseases 0.000 description 1
- 230000003412 degenerative effect Effects 0.000 description 1
- 230000035876 healing Effects 0.000 description 1
- 210000004394 hip joint Anatomy 0.000 description 1
- 230000002757 inflammatory effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 208000015122 neurodegenerative disease Diseases 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 206010039073 rheumatoid arthritis Diseases 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/74—Devices for the head or neck or trochanter of the femur
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- 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
-
- 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
- A61F2/3601—Femoral heads ; Femoral endoprostheses for replacing only the epiphyseal or metaphyseal parts of the femur, e.g. endoprosthetic femoral heads or necks directly fixed to the natural femur by internal fixation devices
- A61F2/3603—Femoral heads ; Femoral endoprostheses for replacing only the epiphyseal or metaphyseal parts of the femur, e.g. endoprosthetic femoral heads or necks directly fixed to the natural femur by internal fixation devices implanted without ablation of the whole natural femoral head
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
- A61F2002/30332—Conically- or frustoconically-shaped protrusion and recess
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30476—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30476—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
- A61F2002/30507—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism using a threaded locking member, e.g. a locking screw or a set screw
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30593—Special structural features of bone or joint prostheses not otherwise provided for hollow
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30604—Special structural features of bone or joint prostheses not otherwise provided for modular
-
- 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
- A61F2002/365—Connections of heads to necks
-
- 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
- A61F2002/3652—Connections of necks to 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
- A61F2/32—Joints for the hip
- A61F2/36—Femoral heads ; Femoral endoprostheses
- A61F2/3662—Femoral shafts
- A61F2002/3678—Geometrical features
- A61F2002/368—Geometrical features with lateral apertures, bores, holes or openings, e.g. for reducing the mass, for receiving fixation screws or for communicating with the inside of a hollow shaft
-
- 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
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
-
- 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
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2220/0033—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
Landscapes
- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Veterinary Medicine (AREA)
- Public Health (AREA)
- Vascular Medicine (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
- Surgery (AREA)
- Neurology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Magnetic Heads (AREA)
Description
DISPOSITIVO PER IL RIVESTIMENTO DELLA TESTA DEL FEMORE DEVICE FOR COVERING THE FEMUR'S HEAD
La presente invenzione riguarda il rivestimento superficiale dell’anca ed in particolare un dispositivo chirurgico di rivestimento della testa di un femore. The present invention relates to the surface coating of the hip and in particular to a surgical device for coating the head of a femur.
II rivestimento superficiale dell’anca, noto nel settore con l’espressione inglese “hip resurfacing”, è una procedura chirurgica che consente di rivestire le superfici dell’anca, ovvero la testa del femore e la cavità acetabolare, in modo da ripristinare il corretto funzionamento dell’articolazione. Tale procedura chirurgica è stata sviluppata come alternativa alla sostituzione totale dell’anca, nota nel settore con l’espressione inglese “total hip resurfacing”, ed è particolarmente indicata per il trattamento di pazienti giovani ai quali sono state diagnosticate malattie degenerative dell’anca di tipo infiammatorio, artrite reumatoide, osteonecrosi o cisti alla testa del femore. The superficial coating of the hip, known in the sector with the English expression "hip resurfacing", is a surgical procedure that allows to coat the surfaces of the hip, that is the head of the femur and the acetabular cavity, in order to restore the correct joint functioning. This surgical procedure was developed as an alternative to total hip replacement, known in the industry as "total hip resurfacing", and is particularly suitable for the treatment of young patients diagnosed with degenerative hip diseases of inflammatory type, rheumatoid arthritis, osteonecrosis or femoral head cyst.
Rispetto alla sostituzione totale dell’anca, che prevede la completa rimozione della testa e del collo del femore e la loro sostituzione con una protesi, un intervento di rivestimento superficiale è notevolmente meno invasivo, in quanto consente di rimuovere minime quantità d’osso mantenendo nel contempo la geometria naturale dell’articolazione. Sono così ridotti i rischi di lussazione dell'anca e risultano più brevi i tempi di guarigione del paziente. Compared to total hip replacement, which involves the complete removal of the head and neck of the femur and their replacement with a prosthesis, a superficial coating operation is considerably less invasive, as it allows you to remove minimal amounts of bone while maintaining the at the same time the natural geometry of the joint. The risks of hip dislocation are thus reduced and the patient's healing times are shorter.
Per realizzare un rivestimento superficiale dell’anca, l’articolazione viene lussata in modo da esporre la testa del femore e la cavità acetabolare del bacino. To create a superficial covering of the hip, the joint is dislocated in order to expose the head of the femur and the acetabular cavity of the pelvis.
La testa del femore viene ricoperta con una protesi a calotta provvista di un attacco che viene inserito in una apposita sede ricavata, ad esempio, per fresatura. Per il montaggio della calotta è inoltre necessario modellare la testa del femore in modo da ricavare in essa un’ulteriore sede di profondità sostanzialmente pari allo spessore della calotta. The head of the femur is covered with a cap prosthesis provided with an attachment that is inserted into a special seat obtained, for example, by milling. For the assembly of the cap it is also necessary to model the head of the femur in order to obtain in it an additional seat with a depth substantially equal to the thickness of the cap.
Se anche la cavità acetabolare del bacino è affetta da malattie degenerative, su di essa viene fissata una protesi a tazza, comunemente chiamata “cotile” nel settore, di forma complementare a quella della protesi a calotta. If the acetabular cavity of the pelvis is also affected by degenerative diseases, a cup prosthesis is fixed on it, commonly called a "cup" in the sector, with a complementary shape to that of the crown prosthesis.
Una volta fissate le protesi, l’articolazione del paziente viene ricomposta inserendo la protesi a calotta nella protesi a tazza. Pertanto, l’articolazione dell’anca sfrutta come superfici di scorrimento la superficie esterna della protesi a calotta e la superficie interna della protesi a tazza, che sostituiscono così le superfici originali danneggiate dalla malattia del paziente. Once the prostheses are fixed, the patient's joint is recomposed by inserting the shell prosthesis in the cup prosthesis. Therefore, the hip joint uses the external surface of the shell prosthesis and the internal surface of the cup prosthesis as sliding surfaces, thus replacing the original surfaces damaged by the patient's disease.
Materiali adatti alla realizzazione delle superfici delle protesi a calotta ed a tazza destinate ad essere accoppiate sono titanio, leghe cromo-cobalto, polietilene e materiali ceramici. Sono generalmente preferiti gli accoppiamenti tra metallo o leghe metalliche e polietilene o materiali ceramici, ma sono anche utilizzati accoppiamenti tra materiali metallici. Materials suitable for the realization of the surfaces of the cap and cup prostheses intended to be coupled are titanium, chromium-cobalt alloys, polyethylene and ceramic materials. Couplings between metal or metal alloys and polyethylene or ceramic materials are generally preferred, but couplings between metal materials are also used.
E noto che i maggiori rischi correlati agli interventi di rivestimento superficiale dell’anca sono le fratture del collo del femore, già indebolito a causa della malattia del paziente, e lo spostamento, o addirittura il distacco, della protesi a calotta dalla testa del femore, il che favorisce il rischio di lussazioni dell’articolazione. It is known that the major risks related to hip superficial resurfacing operations are fractures of the femoral neck, already weakened by the patient's disease, and displacement, or even detachment, of the shell prosthesis from the head of the femur. which favors the risk of dislocation of the joint.
Inoltre, il buon esito di un intervento di rivestimento superficiale dell’anca dipende fortemente dall’esperienza del chirurgo, in particolare per quanto riguarda il corretto posizionamento della protesi a calotta sulla testa del femore, che si presenta generalmente danneggiata ed usurata e quindi priva dei punti di riferimento di un osso sano. Furthermore, the success of a superficial hip resurfacing operation strongly depends on the surgeon's experience, in particular with regard to the correct positioning of the cap prosthesis on the femoral head, which is generally damaged and worn and therefore free of the landmarks of a healthy bone.
Esiste dunque l’esigenza di migliorare il montaggio di una protesi a calotta sulla testa del femore con l’obiettivo di minimizzarne i rischi di spostamento o distacco, nonché i rischi di frattura del collo del femore, il che costituisce uno scopo della presente invenzione. There is therefore a need to improve the assembly of a cap prosthesis on the head of the femur with the aim of minimizing the risks of displacement or detachment, as well as the risk of fracture of the femoral neck, which is an aim of the present invention.
E altresì uno scopo della presente invenzione migliorare il fissaggio di una protesi a calotta con l’obiettivo di renderne più preciso e ripetibile il posizionamento sulla testa del femore. It is also an object of the present invention to improve the fixation of a shell prosthesis with the aim of making its positioning on the head of the femur more precise and repeatable.
Un’idea di soluzione alla base della presente invenzione è quella di ancorare la protesi a calotta destinata a rivestire la testa del femore ad una struttura di supporto inserita nel collo e nel corpo del femore. In questo modo, la calotta non è più supportata esclusivamente dalla testa e dal collo del femore, ma anche dal corpo del femore attraverso la struttura di supporto, il che consente di distribuire in modo più uniforme le sollecitazioni trasmesse dal bacino al femore ed in particolare di ridurre quelle trasmesse alla testa ed al collo. A solution idea underlying the present invention is to anchor the shell prosthesis intended to cover the head of the femur to a support structure inserted in the neck and body of the femur. In this way, the cap is no longer supported exclusively by the head and neck of the femur, but also by the body of the femur through the support structure, which allows for a more even distribution of the stresses transmitted from the pelvis to the femur and in particular to reduce those transmitted to the head and neck.
Il dispositivo dell’invenzione consente quindi di rinforzare il collo del femore, scaricando nel contempo le sollecitazioni a flessione esercitate dal bacino sul chiodo inserito nel canale midollare del femore, in analogia a quanto avviene con dispositivi chirurgici per il trattamento di fratture del collo del femore. The device of the invention therefore makes it possible to reinforce the neck of the femur, while at the same time relieving the bending stresses exerted by the pelvis on the nail inserted in the medullary canal of the femur, in analogy to what happens with surgical devices for the treatment of fractures of the femoral neck. .
Il principale vantaggio offerto dall’invenzione è che, grazie alla presenza della struttura di supporto, l’ancoraggio della protesi a calotta alla testa del femore risulta estremamente stabile, minimizzando il rischio di spostamenti e/o di distacco successivamente all’intervento e quindi di lussazioni dell’articolazione. The main advantage offered by the invention is that, thanks to the presence of the support structure, the anchorage of the cap prosthesis to the head of the femur is extremely stable, minimizing the risk of displacement and / or detachment after surgery and therefore of joint dislocations.
Inoltre, la presenza di una struttura di supporto consente di posizionare con estrema precisione la protesi a calotta sulla testa del femore, il che risulta particolarmente vantaggioso quando l’osso è fortemente usurato o danneggiato e quando una protesi deve essere revisionata e/o sostituita. In addition, the presence of a support structure allows the cap prosthesis to be positioned with extreme precision on the head of the femur, which is particularly advantageous when the bone is heavily worn or damaged and when a prosthesis needs to be revised and / or replaced.
La struttura di supporto comprende un elemento astiforme atto ad essere inserito nel collo del femore ed un chiodo endomidollare atto ad essere inserito nel canale midollare del femore, in cui l’elemento astiforme è ancorato al chiodo endomidollare. Il chiodo endomidollare della struttura di supporto del dispositivo è preferibilmente di tipo modulare, comprendente una porzione distale, atta ad essere inserita in profondità nel canale midollare del femore, ed una porzione prossimale alla quale è vincolato l’elemento astiforme atto ad essere disposto nel collo del femore. The support structure includes a rod-shaped element capable of being inserted into the neck of the femur and an intramedullary nail capable of being inserted into the medullary canal of the femur, in which the rod-shaped element is anchored to the intramedullary nail. The intramedullary nail of the support structure of the device is preferably of the modular type, comprising a distal portion, able to be inserted deep into the medullary canal of the femur, and a proximal portion to which the rod-shaped element able to be arranged in the neck is constrained. of the femur.
L’uso di un chiodo endomidollare di tipo modulare è molto vantaggioso in quanto mette a disposizione del chirurgo una gamma completa di accessori sostituibili per il rivestimento superficiale della testa del femore. Una volta installata la porzione distale del chiodo endomidollare è ad esempio possibile scegliere la porzione prossimale con l’angolo di inclinazione più adatto alla curvatura naturale del femore del paziente. The use of a modular type intramedullary nail is very advantageous as it provides the surgeon with a complete range of replaceable accessories for the surface coating of the femoral head. Once the distal portion of the intramedullary nail has been installed, for example, it is possible to choose the proximal portion with the angle of inclination most suited to the natural curvature of the patient's femur.
E anche possibile sostituire la porzione prossimale del chiodo endomidollare qualora le condizioni del paziente lo richiedessero, o in occasione di una revisione della protesi installata. It is also possible to replace the proximal portion of the intramedullary nail if the patient's condition requires it, or during a revision of the installed prosthesis.
La scelta di un chiodo endomidollare di tipo modulare consente inoltre di inserire il dispositivo di rivestimento in uno strumentario completo che può essere utilizzato da un chirurgo oltre che per il rivestimento superficiale dell’anca anche per interventi di sostituzione totale dell’anca, semplicemente sostituendo la porzione prossimale e l’elemento astiforme con una protesi per anca di tipo modulare da ancorare direttamente alla porzione distale del chiodo endomidollare. The choice of an intramedullary nail of the modular type also allows the insertion of the resurfacing device in a complete instrument set that can be used by a surgeon as well as for the superficial coating of the hip also for total hip replacement operations, simply by replacing the proximal portion and the rod-shaped element with a modular-type hip prosthesis to be anchored directly to the distal portion of the medullary nail.
Ulteriori vantaggi e caratteristiche del dispositivo di rivestimento secondo la presente invenzione risulteranno evidenti agli esperti del ramo dalla seguente descrizione dettagliata e non limitativa di una sua forma realizzativa con riferimento agli annessi disegni in cui: Further advantages and characteristics of the coating device according to the present invention will become evident to those skilled in the art from the following detailed and non-limiting description of an embodiment thereof with reference to the attached drawings in which:
la figura 1 è una vista prospettica in sezione longitudinale che mostra una forma realizzativa del dispositivo di rivestimento secondo l’invenzione; Figure 1 is a perspective view in longitudinal section showing an embodiment of the coating device according to the invention;
la figura 2 è una vista prospettica in esploso che mostra i componenti del dispositivo di rivestimento di figura 1; e Figure 2 is an exploded perspective view showing the components of the coating device of Figure 1; And
- la figura 3 è una vista frontale che mostra schematicamente il dispositivo di rivestimento di figura 1 inserito in un femore di un paziente. Figure 3 is a front view which schematically shows the coating device of Figure 1 inserted in a patient's femur.
Facendo riferimento alle figure 1 e 2, il dispositivo 1 di rivestimento secondo l’invenzione comprende una protesi 2 a calotta destinata ad essere calzata sulla testa di un femore di un paziente. Referring to figures 1 and 2, the coating device 1 according to the invention comprises a cap prosthesis 2 intended to be fitted on the head of a patient's femur.
La protesi 2 a calotta è provvista in modo noto di una superficie di lavoro 21, atta ad impegnarsi in una tazza di forma complementare fissata nella cavità acetabolare del bacino del paziente, ed un attacco 22 atto a consentirne il collegamento alla testa del femore. L’attacco 22 sporge da una superficie interna 23 della protesi 2 destinata ad andare a contatto con la testa del femore e, nella forma realizzativa illustrata, è in forma di uno stelo cilindrico cavo che si sviluppa lungo una direzione assiale della protesi 2. The cap prosthesis 2 is provided in a known way with a work surface 21, suitable for engaging in a cup of complementary shape fixed in the acetabular cavity of the patient's pelvis, and an attachment 22 suitable for allowing its connection to the femoral head. The attachment 22 protrudes from an internal surface 23 of the prosthesis 2 intended to come into contact with the head of the femur and, in the embodiment illustrated, is in the form of a hollow cylindrical stem that develops along an axial direction of the prosthesis 2.
Secondo la presente invenzione, il dispositivo 1 di rivestimento comprende inoltre una struttura di supporto 3 alla quale è vincolabile la protesi 2 a calotta. According to the present invention, the coating device 1 further comprises a support structure 3 to which the cap prosthesis 2 can be attached.
La struttura di supporto 3 comprende un elemento astiforme 4 atto ad essere inserito nel collo del femore ed un chiodo endomidollare 5 atto ad essere inserito nel canale midollare del femore. L’elemento astiforme 4 è inserito in una sede 6, che nella forma realizzativa illustrata ha una forma conica, ricavata nel chiodo endomidollare 5 e forma con esso un angolo prestabilito, sostanzialmente corrispondente all’angolo di inclinazione tra il canale midollare ed il collo del femore. The support structure 3 comprises a rod-shaped element 4 able to be inserted into the neck of the femur and an intramedullary nail 5 able to be inserted into the medullary canal of the femur. The rod-shaped element 4 is inserted in a seat 6, which in the illustrated embodiment has a conical shape, obtained in the intramedullary nail 5 and forms a predetermined angle with it, substantially corresponding to the angle of inclination between the medullary canal and the neck of the femur.
In una configurazione assemblata, nella quale il dispositivo è installato nel femore di un paziente, l’elemento astiforme 4 ha un’estremità vincolata al chiodo endomidollare 5 e l’estremità opposta vincolata alla protesi 2 a calotta, che è a contatto con la testa del femore. In an assembled configuration, in which the device is installed in the femur of a patient, the rod-shaped element 4 has one end constrained to the medullary nail 5 and the opposite end constrained to the shell prosthesis 2, which is in contact with the head of the femur.
L’elemento astiforme 4 comprende un registro a vite atto a consentirne una fine regolazione della posizione rispetto alla sede 6 nella direzione del suo asse A. The rod-shaped element 4 includes a screw register designed to allow a fine adjustment of the position with respect to the seat 6 in the direction of its axis A.
Nella forma realizzativa illustrata, il registro a vite comprende in particolare una vite 7 inserita in un foro filettato 8 ricavato nell’elemento astiforme 4. La vite 7 comprende una testa 7a che, in una configurazione assemblata, poggia contro la superficie esterna del chiodo endomidollare 5 lungo il perimetro della sede 6. Pertanto, serrando la vite 7 nel foro filettato 8 è possibile muovere l’elemento astiforme 4 assialmente rispetto alla sede 6, ottenendo il posizionamento dell’estremità atta a ricevere la protesi 2 a calotta per la testa del femore. In the illustrated embodiment, the screw register comprises in particular a screw 7 inserted in a threaded hole 8 obtained in the rod-shaped element 4. The screw 7 comprises a head 7a which, in an assembled configuration, rests against the external surface of the medullary nail 5 along the perimeter of the seat 6. Therefore, by tightening the screw 7 in the threaded hole 8 it is possible to move the rod-shaped element 4 axially with respect to the seat 6, obtaining the positioning of the end suitable for receiving the cap prosthesis 2 for the head of the femur.
La presenza di un registro a vite consente inoltre di effettuare regolazioni della posizione della protesi 2 una volta che essa è montata sull’elemento astiforme 4, ad esempio per ottenere un corretto allineamento della superficie di lavoro 21 con la superficie ossea adiacente. The presence of a screw register also allows you to make adjustments to the position of the prosthesis 2 once it is mounted on the rod-shaped element 4, for example to obtain a correct alignment of the work surface 21 with the adjacent bone surface.
La testa 7a della vite 7 è preferibilmente svasata e la sede 6 ricavata nel chiodo endomidollare 5 comprende una porzione rastremata atta ad andare a contatto con la testa 7a, il che consente di agevolare la rotazione della vite 7 durante le regolazioni del registro a vite minimizzando nel contempo gli ingombri del registro a vite. The head 7a of the screw 7 is preferably countersunk and the seat 6 obtained in the intramedullary nail 5 comprises a tapered portion able to come into contact with the head 7a, which allows to facilitate the rotation of the screw 7 during the adjustments of the screw register, minimizing at the same time the overall dimensions of the screw register.
Si comprenderà che il registro a vite potrebbe anche essere realizzato in modo equivalente prevedendo una porzione estrema filettata sull’elemento astiforme 4 ed utilizzando un dado al posto della vite 7 a contatto con la superficie esterna del chiodo endomidollare 5. It will be understood that the screw register could also be made in an equivalent way by providing an extreme threaded portion on the rod-shaped element 4 and using a nut instead of the screw 7 in contact with the external surface of the intramedullary nail 5.
L’ampiezza dell’escursione dell’elemento astiforme 4 rispetto alla sede 6 può essere limitata mediante appositi fine corsa. Nella forma realizzativa illustrata, ad esempio, l’elemento astiforme 4 comprende, in corrispondenza dell’estremità atta ad essere inserita nella sede 6, una porzione 41 di sezione ridotta che presenta due facce piane diametralmente opposte. Il chiodo endomidollare 5 comprende un perno 9 sagomato a forchetta alloggiato in una cavità 10 ricavata assialmente nella sua porzione prossimale. Nella configurazione assemblata il perno 9 impegna la porzione 41 a sezione ridotta andando a contatto con i rebbi sulle facce piane diametralmente opposte della porzione 4L In questo modo il perno 9 limita l’escursione dell’elemento astiforme 4 rispetto alla sede 6 e ne impedisce nel contempo la rotazione. The amplitude of the excursion of the rod element 4 with respect to the seat 6 can be limited by means of special limit switches. In the illustrated embodiment, for example, the rod-shaped element 4 comprises, at the end suitable to be inserted in the seat 6, a portion 41 of reduced section which has two diametrically opposite flat faces. The intramedullary nail 5 comprises a fork-shaped pin 9 housed in a cavity 10 obtained axially in its proximal portion. In the assembled configuration, the pin 9 engages the portion 41 with reduced section by contacting the prongs on the diametrically opposite flat faces of the portion 4L In this way the pin 9 limits the excursion of the rod-shaped element 4 with respect to the seat 6 and prevents it in the rotation at the same time.
L’estremità dell’elemento astiforme 4 opposta a quella vincolata al chiodo endomidollare 5 è sagomata in modo da consentire il collegamento della protesi 2 a calotta in corrispondenza dell’attacco 22. The end of the rod-shaped element 4 opposite to that bound to the intramedullary nail 5 is shaped so as to allow the connection of the shell prosthesis 2 at the attachment 22.
Nella forma realizzativa illustrata, il collegamento tra l’estremità dell’elemento astiforme 4 e l’attacco 22 viene effettuato mediante un attacco conico, ad esempio di tipo Morse, per cui l’estremità dell’elemento astiforme e la cavità dell’attacco 22 della protesi 2 presentano uno stesso grado di conicità. In the illustrated embodiment, the connection between the end of the rod element 4 and the attachment 22 is carried out by means of a conical attachment, for example of the Morse type, whereby the end of the rod element and the cavity of the attachment 22 of the prosthesis 2 have the same degree of taper.
Alternativamente, è possibile prevedere un collegamento di tipo filettato, a scatto o simile. Alternatively, it is possible to provide a connection of the threaded, snap-on or similar type.
Facendo ora riferimento alla figura 3, durante un intervento di rivestimento superficiale dell’anca, un femore F di un paziente viene inizialmente forato nella direzione dell’asse del collo N ricavando un primo canale Cl, sostanzialmente coassiale al collo N, che collega la testa H al corpo B. Il primo canale Cl viene successivamente allargato fino ad ottenere un diametro sufficiente a consentire l’inserimento dell’elemento astiforme 4. Referring now to Figure 3, during a superficial hip resurfacing operation, a patient's femur F is initially drilled in the direction of the axis of the neck N, obtaining a first channel Cl, substantially coaxial to the neck N, which connects the head H to body B. The first channel Cl is subsequently widened until a diameter sufficient to allow the insertion of the rod-shaped element 4 is obtained.
La testa H del femore F viene quindi lavorata per fresatura per ricavare una prima sede SI coassiale al primo canale Cl ed avente dimensioni tali da alloggiare l’attacco 22 della calotta 2. The head H of the femur F is then machined by milling to obtain a first seat SI coaxial to the first channel Cl and having such dimensions as to house the attachment 22 of the cap 2.
Una volta realizzato il primo canale Cl e la prima sede SI, la superficie della testa H del femore F viene modellata in modo da ricavare una seconda sede S2 di profondità sostanzialmente corrispondente allo spessore della calotta 2. In questo modo, una volta installata, la calotta 2 si raccorderà perfettamente con la superficie della testa H del femore F e del collo N. Once the first channel Cl and the first seat SI have been made, the surface of the head H of the femur F is modeled in such a way as to obtain a second seat S2 with a depth substantially corresponding to the thickness of the cap 2. In this way, once installed, the cap 2 will perfectly connect with the surface of the head H of the femur F and of the neck N.
II femore F viene inoltre forato lungo il canale midollare MC ricavando un secondo canale C2 atto a ricevere il chiodo endomidollare 5. Il primo ed il secondo canale Cl, C2 si incrociano all’altezza della porzione prossimale del femore del paziente. The femur F is also drilled along the medullary canal MC obtaining a second canal C2 suitable for receiving the intramedullary nail 5. The first and second canal Cl, C2 cross at the height of the proximal portion of the patient's femur.
L’elemento astiforme 4 ed il chiodo endomidollare 5 vengono quindi inseriti nei rispettivi canali Cl, C2 e fissati uno sull’altro come sopra indicato, formando così la struttura di supporto 3 del dispositivo 1 di rivestimento, che risulta quindi pronta a ricevere la protesi 2 a calotta atta a rivestire la testa H del femore F. The rod-shaped element 4 and the intramedullary nail 5 are then inserted into the respective channels Cl, C2 and fixed on each other as indicated above, thus forming the support structure 3 of the covering device 1, which is therefore ready to receive the prosthesis. 2 to cover the head H of the femur F.
Secondo un ulteriore aspetto della presente invenzione, il chiodo endomidollare 5 è in particolare un chiodo di tipo modulare, comprendente una porzione prossimale 51, destinata ad essere inserita nella porzione prossimale del femore ed alla quale è vincolato l’elemento astiforme 4, ed una porzione distale 52 atta ad essere inserita in profondità nel canale midollare del femore F. Una volta inserito il chiodo endomidollare 5 nel secondo canale C2, la porzione prossimale 51 affiorerà dall’estremità prossimale del femore F. According to a further aspect of the present invention, the intramedullary nail 5 is in particular a nail of the modular type, comprising a proximal portion 51, intended to be inserted in the proximal portion of the femur and to which the rod-shaped element 4 is constrained, and a portion distal 52 able to be inserted deep into the medullary canal of the femur F. Once the intramedullary nail 5 has been inserted into the second canal C2, the proximal portion 51 will emerge from the proximal end of the femur F.
La porzione prossimale 51 e la porzione distale 52 sono preferibilmente collegate una all’altra mediante un attacco conico, ad esempio un di tipo Morse, e trattenute assialmente mediante una vite 11. The proximal portion 51 and the distal portion 52 are preferably connected to each other by means of a conical attachment, for example a Morse type, and held axially by means of a screw 11.
La porzione prossimale 51 e la porzione distale 52 possono essere coassiali, oppure, come nell’esempio mostrato nelle figure, inclinate tra loro di un angolo prestabilito, ad esempio compreso fra 0 e 5 gradi, il che consente un migliore centraggio del chiodo endomidollare 5 rispetto al canale midollare MC del femore F. Come noto infatti il corpo B del femore F presenta una lieve curvatura, per cui, quando il chiodo endomidollare 5 viene inserito molto in profondità nel canale midollare MC, può essere vantaggioso utilizzare una geometria angolata. The proximal portion 51 and the distal portion 52 can be coaxial, or, as in the example shown in the figures, inclined to each other by a predetermined angle, for example between 0 and 5 degrees, which allows better centering of the intramedullary nail 5 compared to the medullary canal MC of the femur F. As is known, in fact, the body B of the femur F has a slight curvature, so that when the medullary nail 5 is inserted very deeply into the medullary canal MC, it can be advantageous to use an angled geometry.
L’uso di un chiodo endomidollare di tipo modulare è molto vantaggioso in quanto mette a disposizione del chirurgo un’intera gamma completa di accessori sostituibili per l’intervento di rivestimento superficiale dell’anca. Una volta installata la porzione distale 52 del chiodo endomidollare 5, infatti, è ad esempio possibile scegliere la porzione prossimale 51 con l’angolo di inclinazione più adatto alla curvatura naturale del femore F del paziente. The use of an intramedullary nail of the modular type is very advantageous as it provides the surgeon with a full range of replaceable accessories for hip surface coating surgery. Once the distal portion 52 of the intramedullary nail 5 has been installed, in fact, for example, it is possible to choose the proximal portion 51 with the angle of inclination most suited to the natural curvature of the patient's femur F.
E anche possibile sostituire la sola porzione prossimale 51 del chiodo endomidollare 5 qualora un peggioramento delle condizioni del paziente o una revisione periodica della protesi installata lo rendesse necessario. It is also possible to replace only the proximal portion 51 of the intramedullary nail 5 should a worsening of the patient's condition or a periodic revision of the installed prosthesis make it necessary.
La modularità del chiodo endomidollare 5 consente inoltre di inserire il dispositivo 1 di rivestimento in uno strumentario completo che può essere utilizzato da un chirurgo oltre che per il rivestimento superficiale dell’anca anche per interventi di sostituzione totale dell’anca, sostituendo la porzione prossimale 51 e l’elemento astiforme 4 con una protesi per anca. The modularity of the intramedullary nail 5 also allows the insertion of the coating device 1 into a complete instrument set that can be used by a surgeon as well as for the superficial coating of the hip also for total hip replacement operations, replacing the proximal portion 51 and the rod-shaped element 4 with a hip prosthesis.
E chiaro che le forme realizzative del dispositivo di rivestimento secondo Tinvenzione costituiscono solo esempi suscettibili di numerose varianti. Ad esempio, la superficie laterale del chiodo endomidollare 5 può essere liscia, oppure presentare una struttura superficiale atta ad impedire rotazioni del chiodo, ed in particolare della sua porzione distale 52, una volta installato nel canale midollare MC. La struttura superficiale potrebbe, ad esempio, presentare una pluralità di creste e/o scanalature che si sviluppano lungo la direzione assiale del chiodo endomidollare 5. It is clear that the embodiments of the coating device according to the invention are only examples susceptible of numerous variations. For example, the lateral surface of the intramedullary nail 5 can be smooth, or have a surface structure capable of preventing rotation of the nail, and in particular of its distal portion 52, once installed in the medullary canal MC. The surface structure could, for example, have a plurality of ridges and / or grooves which develop along the axial direction of the intramedullary nail 5.
Claims (12)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT000417A ITMI20110417A1 (en) | 2011-03-16 | 2011-03-16 | DEVICE FOR COATING THE HEAD OF THE FEMORE |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT000417A ITMI20110417A1 (en) | 2011-03-16 | 2011-03-16 | DEVICE FOR COATING THE HEAD OF THE FEMORE |
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| ITMI20110417A1 true ITMI20110417A1 (en) | 2012-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| IT000417A ITMI20110417A1 (en) | 2011-03-16 | 2011-03-16 | DEVICE FOR COATING THE HEAD OF THE FEMORE |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0382395A1 (en) * | 1989-02-08 | 1990-08-16 | Smith & Nephew Richards, Inc. | Modular system for femoral fixation |
| US5855579A (en) * | 1994-07-15 | 1999-01-05 | Smith & Nephew, Inc. | Cannulated modular intramedullary nail |
| US20060200160A1 (en) * | 2005-02-18 | 2006-09-07 | Ebi, L.P. | Internal fixation assemblies and associated instruments |
| GB2432318A (en) * | 2005-11-18 | 2007-05-23 | Corin Ltd | Resurfacing femoral head component |
| DE202010012927U1 (en) * | 2010-11-18 | 2011-01-20 | Matveev, Anatoly L. | Apparatus for the endoprosthesis of the hip joint with replacement of the joint surfaces and for the operative prophylaxis of thigh fractures in the proximal region in osteoporosis |
-
2011
- 2011-03-16 IT IT000417A patent/ITMI20110417A1/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0382395A1 (en) * | 1989-02-08 | 1990-08-16 | Smith & Nephew Richards, Inc. | Modular system for femoral fixation |
| US5855579A (en) * | 1994-07-15 | 1999-01-05 | Smith & Nephew, Inc. | Cannulated modular intramedullary nail |
| US20060200160A1 (en) * | 2005-02-18 | 2006-09-07 | Ebi, L.P. | Internal fixation assemblies and associated instruments |
| GB2432318A (en) * | 2005-11-18 | 2007-05-23 | Corin Ltd | Resurfacing femoral head component |
| DE202010012927U1 (en) * | 2010-11-18 | 2011-01-20 | Matveev, Anatoly L. | Apparatus for the endoprosthesis of the hip joint with replacement of the joint surfaces and for the operative prophylaxis of thigh fractures in the proximal region in osteoporosis |
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