ITBO990624A1 - Endoprotesi d' anca perfezionata . - Google Patents
Endoprotesi d' anca perfezionata . Download PDFInfo
- Publication number
- ITBO990624A1 ITBO990624A1 IT1999BO000624A ITBO990624A ITBO990624A1 IT BO990624 A1 ITBO990624 A1 IT BO990624A1 IT 1999BO000624 A IT1999BO000624 A IT 1999BO000624A IT BO990624 A ITBO990624 A IT BO990624A IT BO990624 A1 ITBO990624 A1 IT BO990624A1
- Authority
- IT
- Italy
- Prior art keywords
- metaphysial
- infibuliform
- collar
- module
- hip
- Prior art date
Links
- 230000008878 coupling Effects 0.000 claims abstract description 9
- 238000010168 coupling process Methods 0.000 claims abstract description 9
- 238000005859 coupling reaction Methods 0.000 claims abstract description 9
- 210000003049 pelvic bone Anatomy 0.000 claims abstract description 5
- 230000000295 complement effect Effects 0.000 claims description 3
- 238000007373 indentation Methods 0.000 claims 1
- 230000002093 peripheral effect Effects 0.000 abstract 1
- 210000001624 hip Anatomy 0.000 description 9
- 210000000988 bone and bone Anatomy 0.000 description 5
- 239000007943 implant Substances 0.000 description 3
- 230000001054 cortical effect Effects 0.000 description 2
- 210000003414 extremity Anatomy 0.000 description 2
- 208000003076 Osteolysis Diseases 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 210000000588 acetabulum Anatomy 0.000 description 1
- 210000003484 anatomy Anatomy 0.000 description 1
- 230000003412 degenerative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 208000029791 lytic metastatic bone lesion Diseases 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003387 muscular Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
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- 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
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- 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
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- A61F2/367—Proximal or metaphyseal parts of shafts
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- A61F2/3676—Distal or diaphyseal parts of shafts
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- 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
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- A61F2002/30362—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 with possibility of relative movement between the protrusion and the recess
- A61F2002/30364—Rotation about the common longitudinal axis
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- 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
- A61F2220/0041—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels or rivets, e.g. connecting screws
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
- A61F2230/0017—Angular shapes
Landscapes
- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Prostheses (AREA)
- External Artificial Organs (AREA)
Description
Titolo: "ENDOPROTESI D'ANCA PERFEZI
La presente invenzione ha per oggetto un ' endoprotesi d'anca perfezionata.
Sono note endoprotesi d'anca consistenti in un corpo allungato conposto da una parte metaf isiaria, intermedia fra una parte distale ed una parte prossimale.
La parte distale è costituita da uno stelo o infibulo opportunamente rastremato per l' introduzione nel canale midollare .
La estremità dell 'infibulo presenta tagli radiali il cui scopo è quello di modulare la rigidità dello stelo all' interno del canale midollare evitando che insorgano zone di netta differenza di rigidità all'estremità dell' infibulo.
La parte prossimale è costituita da un collare dal quale si estende obliquamente un gambo predisposto per l'accoppiamento conico di una testa sferica destinata ad impegnarsi articolarmente in una sede complementare di un cotile ancorato nell'osso pelvico.
Il collare è assicurato sulla parte metaf isiaria tramite un accoppiamento conico che ne consente l'orientamento rispetto all'asse longitudinale dell ' endoprotesi .
Alle endoprotesi note sono propri alcuni sostanziali inconvenienti che ne compromettono o limitano l'efficacia. Innanzitutto occorre osservare che le endoprotesi note sono dotate esternamente di nervature longitudinali aventi la funzione di realizzare un inpegno antirotazione nel canale midollare . Tuttavia tali nervature creano zone di iperpressione a carico della corticale ossea con conseguente osteolisi reattiva ed indebolimento della stabilità dell ' impianto protesico.
In secondo luogo, durante la marcia, i carichi sulla protesi generano dei momenti che determinano indebite sollecitazioni di conpressione sulla corticale ossea da parte del collare all 'altezza della zona compresa fra il gambo e la parte metafisiaria.
Il carpito tecnico della presente invenzione è ora quello di escogitare un ' endoprotesi d'anca che consenta di ovviare alle citate manchevolezze di quelle attualmente in uso.
Nell'ambito di tale compito costituisce uno scopo della presente invenzione la realizzazione di una endoprotesi d'anca avente una struttura a moduli intercambiabili, tali da consentire una vasta gamma di combinazioni di montaggio adattabili alle diverse esigenze di impianto femorale.
Tale compito e tale scopo vengono ottenuti con un’enctoprotesi d'anca comprendente una porzione metafisiaria che, dal lato distale, è raccordata ad una porzione infibuliforme e, dal lato prossimale, presenta un accoppiamento conico per un collaredal quale si estende obliquamente un gambo di attacco per una testa sferica di articolazione della endoprotesi all'osso pelvico, caratterizzato dal fatto che dette porzioni metafisiarie ed infibuliforme presentano una sezione poligonale e che la detta porzione metafisiaria, al di sotto di detto gambo, si protende oltre la periferia di detto collare, formando un gradino che con detto gambo definisce una rientranza.
Ulteriori caratteristiche della presente invenzione risulteranno maggiormente dalla descrizione che segue di una forma di esecuzione preferita, illustrate a titolo esemplificativo, non limitativo negli uniti disegni incui:
lafig. 1 mostra una vista in sezione longitudinale di una endoprotesi d'ancadi struttura monoblocco;
la fig. 2 èunavista assiale secondo il piano II-.IIdi fig.1;
la fig. 3 è una vista secando il piano di sezione III-III di fig. 1;
la fig. 4 mostra una vista laterale di una endoprotesi d'ancadi tipomodulare ed infine
la fig. 5 mostra una vista esplosa della endoprotesidi fig.4.
Facendo riferimento alle figure 1 e 2, con 1 è indicata una endoprotesi d'anca secondo l'invenzione in oggetto. Tale endoprotesi comprende una porzione 2 metafisiaria, dalla quale si prolunga una porzione infibuliforme (detta in seguito infibulo) di asse A che termina con una punta ogivale 4.
La endoprotesi 1 ha una sezione poligonale ad ottagono, appiattito nel piano di mezzeria P in modo da avere le due facce F1,F2 perpendicolari all'asse maggiore, perpendicolari al piano P.
La porzione metaf isiaria 2 è raccordata all' infibulo 3 in modo da rastremarsi verso la punta ogivale 4.
L'estremità della porzione 2, opposta alla punta 4, presenta un piano 5 dal quale si eleva un codolo tubolare 6 di asse B, conico esternamente. L'asse B è disassato verso la faccia FI rispetto all'asse A.
Sul codolo tubolare 6 è accoppiato un collare 7 dal quale si estende obliquamente secondo l'asse C e formando un angolo ottuso con la parte metaf isiaria 2, un gambo 8 terminante con un tronco di cono 9 per l'applicazione della testa sferica di articolazione dell ' endoprotesi 1 nel cotile ancorato nell'acetabolo dell'osso pelvico.
Attraverso il collare 7 e la boccola 6 è condotta una vite 10 che, avvitata in un foro filettato Ila della parte metaf isiaria 2, permette di bloccare il collare 7 sulla boccola 6 e quindi stabilire l'orientamento angolare del gambo 8 rispetto al piano di mezzeria P. Il collare 7 ha un diametro esterno tale da rimanere interno alla superficie ccnpresa fra l'asse B e la faccia FI. In tal modo la parte metafisiari , sporge, sotto al garrito 8, con un gradino 11 il quale, con il garrito 8, fonia una rientranza 12.
L'endoprotesi descritta presenta una tem a di tagli 13,14,15 talòi che il taglio 13 formi un angolo di 135° con gli altri due tagli 14,15 rispetto all'asse A. Inoltre il taglio 13 giace nel piano P ed è aperto sulla faccia FI, mentre gli altri due 14,15 delimitano un settore 16 comprendente la faccia F2 che rimane integra.
Come si riconosce 11endoprotesi descritta raggiunge perfettamente gli scopi preposti. La sezione ad ottagono appiattito, in particolare della porzione metaf isiaria, conferisce alla protesi 1, la facoltà di potersi adattare alla forma del canale midollare favorendo un intimo legame con l'osso femorale. Nel contempo gli spigoli dell'ottagono, mentre assicurano un valido effetto antirotazione, non danno luogo a taglienti in grado di incidere sul tessuto osseo ed innescare processi degenerativi della stabilità dell'impianto osseo.
Costituisce un particolare vantaggio della presente invenzione il disassamento fra l'asse A dello stelo e l'asse B del collare che riduce il carico sulle corticali.
Un ulteriore vantaggio che favorisce anch'esso migliore distribu zione del carico sulle corticali, è offerrto dalla faccia piana FI che presenta un'anpia area in virtù della ottagonalità della sezione trasversa. La configurazione trasversa ottagonale permette di sfruttare una migliore sollecitazione sulle corticali ottenuta da disassamento nel giusto equilibrio tra sollecitazione sulla corticale mediale e laterale ed il mantenimento del contatto con le corticali anteriore e posteriore tale da rendere stabile l'infibulo alle sollecitazioni in rotazione secondo il piano trasverso. L'accoppiata tra ortogonalità e disassamento permette pertanto di ottenere una migliore ripartizione dei carichi sulle corticali mantenendone pari la stabilità rotatoria.
Da rilevare che la faccia interna FI e la faccia esterna F2, in particolare del settore 16, forniscono una maggiore superficie d'appoggio sulle corticali e quindi una minore pressione. La rientranza 12 consente, durante la marcia, una distribuzione dei carichi ed una consequenziale variazione dei momenti generati dalla componente muscolare di stabilizzazione .
L’endpprotesi descritta è suscettibile di nunerose modifiche e varianti, tutte rientranti nel medesimo concetto inventivo. Le figure 4 e 5 mostrano una soluzione in cui la parte metafisiaria e l'infibulo costituiscono due distinti moduli metafisiario 17 e distale 18 presentanti rispettivamente una cavità conica 19 ed un codolo tubolare 20 complementari fra di loro per consentire l'accoppiamento per mezzo della vite 10 che, dopo aver attraversato il collare 7 ed il modulo metafisiario 17, s'impegna per avvitamento nel foro filettato del modulo distale 18. Per assicurare maggiormente contro la rotazione di un nodulo 17 rispetto all'altro 18, è previsto un dai te 21 che dal bordo inferiore del modulo metafisiario 17 s ' impegna in una tacca 22 del modulo distale 18, alla base del codolo tubolare 20.
Variando opportunamente forma e dimensioni dei moduli 17 e 18 è possibile ottenere un vasto numero di combinazioni in grado di adattarsi alle diverse anatomie femorali.
Nella pratica attuazione dell'invenzione i materiali impiegati possono essere qualsiasi a seconda delle esigenze . Vantaggiosamente 1 ' endoprotesi è realizzata in lega di titanio biocompatibile.
Claims (6)
- R I V E N D I C A Z I O N I 1. Endoprotesi d'anca comprendente una porzione metafisiaria che, dal lato distale, è raccordata ad una porzione inf ibuliforme e, dal lato prossimale, presenta un accoppiamento conico per un collare dal quale si estende obliquamente un gambo di attacco per una testa sferica di articolazione della endoprotesi all'osso pelvico, caratterizzato dal fatto che dette porzioni metafisiarie ed infibuliforme presentano una sezione poligonale e che la detta porzione metafisiaria, al di sotto di detto gambo, si protende oltre la periferia di detto collare, formando un gradino che con detto gambo definisce una rientranza.
- 2. Endoprotesi d'anca secondo la rivendicazione 1 caratterizzata dal fatto che dette porzioni metafisiarie ed inf ibuliforme presentano una sezione ottagonale appiattita sul piano di mezzeria con due facce perpendicolari all'asse maggiore di detta sezione.
- 3. Endoprotesi d'anca secondo la rivendicazione 2 caratterizzata dal fatto che detta porzione infibuliforme presenta un'estremità dotata di una tema di tagli definenti un settore avente una faccia perpendicolare all'asse maggiore di detta sezione.
- 4. Endoprotesi d'anca secondo una delle rivendicazioni precedenti caratterizzata dal fatto che detta parte metafisiaria e detta parte inf ibuliforme costituiscono due distinti moduli metafisiario e distale presentanti rispettivamente una cavità conica ed un codolo tubolare complementari fra di loro per consentire 1 ' accoppiamento per mezzo di una vite condotta attraverso detto collare e detto modulo metafisiario ed impegnantesi per avvitamento in un foro filettato del detto modulo distale.
- 5. Endoprotesi d' anca secondo la rivendicazione 4 caratterizzata dal fatto che, per assicurare maggiormente contro la rotazione un modulo rispetto all'altro, è previsto un dente che dal bordo inferiore del detto modulo metafisiario s'impegna in una tacca del modulo distale.
- 6. Endoprotesi d'anca secondo quanto desumibile dalla descrizione che precede e dai disegni allegati.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT1999BO000624A IT1311585B1 (it) | 1999-11-17 | 1999-11-17 | Endoprotesi d'anca perfezionata. |
DE60019531T DE60019531D1 (de) | 1999-11-17 | 2000-06-26 | Hüftendoprothese |
EP00113081A EP1101460B1 (en) | 1999-11-17 | 2000-06-26 | Hip endoprosthesis |
AT00113081T ATE293405T1 (de) | 1999-11-17 | 2000-06-26 | Hüftendoprothese |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT1999BO000624A IT1311585B1 (it) | 1999-11-17 | 1999-11-17 | Endoprotesi d'anca perfezionata. |
Publications (3)
Publication Number | Publication Date |
---|---|
ITBO990624A0 ITBO990624A0 (it) | 1999-11-17 |
ITBO990624A1 true ITBO990624A1 (it) | 2001-05-17 |
IT1311585B1 IT1311585B1 (it) | 2002-03-13 |
Family
ID=11344353
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT1999BO000624A IT1311585B1 (it) | 1999-11-17 | 1999-11-17 | Endoprotesi d'anca perfezionata. |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1101460B1 (it) |
AT (1) | ATE293405T1 (it) |
DE (1) | DE60019531D1 (it) |
IT (1) | IT1311585B1 (it) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2832624B1 (fr) * | 2001-11-23 | 2004-08-27 | Science Medecine Sa | Tige femorale pour prothese de hanche |
DE102004038281B3 (de) * | 2004-08-03 | 2006-05-11 | Endoplant Gmbh | Schenkelhalsprothese |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2576793B1 (fr) * | 1985-01-31 | 1991-05-24 | Rhenter Jean Luc | Prothese articulaire perfectionnee en titane |
EP0257359B1 (en) * | 1986-08-15 | 1991-11-27 | Boehringer Mannheim Corporation | Modular hip prosthesis |
CH671689A5 (it) * | 1987-05-15 | 1989-09-29 | Sulzer Ag | |
FR2634371A1 (fr) * | 1988-07-21 | 1990-01-26 | Flegeau Gerard | Prothese de hanche et procede de fabrication d'une telle prothese |
US5653764A (en) * | 1994-02-17 | 1997-08-05 | Murphy; Stephen B. | Modular hip prosthesis with discrete selectable angular orientation |
US5653765A (en) * | 1994-07-01 | 1997-08-05 | Ortho Development Corporation | Modular prosthesis |
US5725592A (en) * | 1996-10-29 | 1998-03-10 | Hayes Medical, Inc. | Modular prosthesis having neck component connected to stem component through cavity in body component |
FR2767471B1 (fr) * | 1997-08-25 | 2003-02-21 | Rech S Et De Fabrication S E R | Tige femorale de prothese de hanche |
-
1999
- 1999-11-17 IT IT1999BO000624A patent/IT1311585B1/it active
-
2000
- 2000-06-26 AT AT00113081T patent/ATE293405T1/de not_active IP Right Cessation
- 2000-06-26 DE DE60019531T patent/DE60019531D1/de not_active Expired - Lifetime
- 2000-06-26 EP EP00113081A patent/EP1101460B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ITBO990624A0 (it) | 1999-11-17 |
IT1311585B1 (it) | 2002-03-13 |
EP1101460B1 (en) | 2005-04-20 |
EP1101460A1 (en) | 2001-05-23 |
ATE293405T1 (de) | 2005-05-15 |
DE60019531D1 (de) | 2005-05-25 |
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