CA2379789A1 - Anti-dislocation bilateral hip prosthesis - Google Patents

Anti-dislocation bilateral hip prosthesis Download PDF

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Publication number
CA2379789A1
CA2379789A1 CA002379789A CA2379789A CA2379789A1 CA 2379789 A1 CA2379789 A1 CA 2379789A1 CA 002379789 A CA002379789 A CA 002379789A CA 2379789 A CA2379789 A CA 2379789A CA 2379789 A1 CA2379789 A1 CA 2379789A1
Authority
CA
Canada
Prior art keywords
dislocation
acetabular
hip prosthesis
femoral head
stem
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
CA002379789A
Other languages
French (fr)
Inventor
Donato Caldaroni
Fiore Caldaroni
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tecnomeccanica SRL
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2379789A1 publication Critical patent/CA2379789A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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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
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/34—Acetabular cups
    • A—HUMAN NECESSITIES
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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
    • 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
    • A—HUMAN NECESSITIES
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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
    • A61F2/02—Prostheses implantable into the body
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    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • A61F2/3676—Distal or diaphyseal parts of shafts
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    • A61F2/02—Prostheses implantable into the body
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    • A61F2002/30199—Three-dimensional shapes
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    • A61F2002/3021—Three-dimensional shapes conical frustoconical
    • A—HUMAN NECESSITIES
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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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    • A61F2002/30329—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
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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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    • A61F2002/30316—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
    • A61F2002/30354—Cylindrically-shaped protrusion and recess, e.g. cylinder of circular basis
    • A—HUMAN NECESSITIES
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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
    • A61F2/02—Prostheses implantable into the body
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    • 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
    • A61F2002/30405—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by screwing complementary threads machined on the parts themselves
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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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
    • 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
    • A61F2002/30433—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
    • A—HUMAN NECESSITIES
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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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    • A61F2002/30329—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
    • A61F2002/30495—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism using a locking ring
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    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
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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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    • A61F2/00—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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    • A61F2/00—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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    • A61F2/00—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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    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2002/4631—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor the prosthesis being specially adapted for being cemented
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    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
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    • 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
    • A—HUMAN NECESSITIES
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    • 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
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    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0063—Three-dimensional shapes
    • A61F2230/0067—Three-dimensional shapes conical
    • 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
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00011—Metals or alloys
    • A61F2310/00017—Iron- or Fe-based alloys, e.g. stainless steel
    • 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
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00011—Metals or alloys
    • A61F2310/00023—Titanium or titanium-based alloys, e.g. Ti-Ni alloys
    • 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
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00179—Ceramics or ceramic-like structures

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)
  • Materials For Medical Uses (AREA)

Abstract

The present invention relates to an anti-dislocation bilateral hip prosthesi s (1) comprising a stem (2), that is introduced within a corresponding vertica l hole realised into the femur, a femoral head (4), that is inserted within a corresponding hole realised into the collum femoris, and that couples with said stem (2), said femoral head (4) having a joint spherical end, an acetabular cotyle (7), implanted in the pelvis and an anti friction acetabul ar cup (8), provided between said acetabular cotyle (7) and said spherical end of the femoral head (4).

Description

ANTI-DISLOCATION BILATERAL HIP PROSTHESYS
The present invention relates to an anti-dislocation bilateral hip prosthesis.
More particularly, the invention relates to prosthesis of the above kind, realised in such a way to allow a remarkably higher mobility of the lower limbs with respect to what can be obtained by the present prosthesis.
Hip prosthesis presently available on the market allows a sufficient gait, but they are characterised y a high dislocation risk.
In fact, known hip prosthesis are characterised by remarkable d rawbacks.
First of all, it must be mentioned the fact that the allow a limited gait mobility for the lower limbs, and particularly limited flexion, adduction and extension.
As far as flexion is concerned, i.e. the flexion of the lower limb toward the torso, the maximum reachable angle by the limb is of 90°.
During the adduction, i.e. the flexion of the lower limb backward, the maximum reachable angle is of 10°, while in the extension, or flexion of the lower limb along a rear plane, the maximum reachable angle is of 10° with respect to the human body axis when in an erected position.
In case the prosthesis is stresses beyond the above-mentioned values, they dislocate, requiring an urgency recovery with the hospital, to reduce the dislocated prosthesis, with the consequent need of being subjected to a general anaesthesia.
All the above induces in the patient a high anxiety due to the possibility of the occurrence of a dislocation.
In view of the above, the Applicant has realised a hip prosthesis able to solve the above-mentioned drawbacks, mainly allowing a higher gait freedom and remarkably reducing the dislocation risk.
By the solution according to the invention, as already said, it is obtained an optimum gait mobility for the lower limbs, with particular reference to the flexion, adduction and extension.
Particularly, the solution according to the present invention allows to obtain a limb flexion of about 127°, an adduction angle of 50°
and an extension angle of about 42°.

03-d7-2001 CA 02379789 2002-O1-25 (T000028~
Furthem~ore, by the solution according to the invention, in case the above mentioned values are passed, the prosthesis does not dislocate under standard conditions, i.e. while sleeping, seating, going up and down the stairs, sleeping, etc. with the consequent practical and psychological advantages for the patient.
US-A-3,067,740 describes a prosthesis having the features of the pre-characterising portion of the claim 1 of the present invention.
It is therefore specific object of the present invention an anti dislocation bilateral hip prosthesis, comprising a stem, that is introduced within a corresponding vertical hole realised into the femur, a femoral head, having a special end, that is inserted within a corresponding hole realised into the coltum femoris, and that couples with said stem, said femoral head having a joint spherical end and an acetabular cotyte, implanted in the pelvis, said prosthesis being characterised in that an anti friction acetabular cup is provided between said acetabular cotyie and said sperical end of the femoral head, said anti friction acetabular cup being kept within the acetabular cotyle by a ring, and in that a groove is provided on said spherical end of the femoral head.
~ Preferably, according to the invention, said anti friction acetabufar cup is kept within the acetabular cotyle by a ring.
Particularly, according to the invention, said stern has a truncated cone section, and can be comprised of metallic material, such as titanium alloy, or AISI 316 L stainless steel, or any other anti-rejection material.
Still according to the invention, said femoral head can be coupled with said stem by threading, truncated cone coupling, etc.
Preferably, said femora( head can be comprised of metallic material, such as titanium alloy, or AISI 316 I_ stainless steel, or ceramic material, or any other anti-rejection material.
Particularly, for the fixing of the femoral head to the stem, a locking screw can be provided, acting along the axis of the stem.
Furthermore, according to the invention, said acetabular cotyle can be implanted in the pelvis by screws, or it is cemented, or fixed, or fixed in any other way.
AMENDED SHEET

03-07-2001 CA 02379789 2002-O1-25 ~ ~ ~0~~!'28~+
2bis Further, said acetabular cotyie can be comprised of metallic material, such as titanium alloy, or AISI 316 L stainless steel, or any other anti-rejection material.
Always according to the invention, said anti friction acetabular cup can be comprised of non-toxic polyammidic material according to the F.D.A. rules N° C.F.R. 177.2415 and the UE rules N°
9011281E.E.C., or of ceramic material or any other anti-rejection material.
AMENDED SHEET
Still according to the invention, said ring provided between the acetabular cup and the femoral head can be fixed to the acetabular cotyle by screws.
Preferably, said ring can be comprised of non-toxic polyammidic material according to the F.D.A. rules N° C.F.R. 177.2415 and the UE rules N° 901128/E.E.C..
The present invention will be now described, for illustrative but not limitative purposes, according to its preferred embodiments, with particular reference to the figures of the enclosed drawings, wherein:
figure 1 is a perspective view of an embodiment of a hip prosthesis according to the invention;
figure 2 is a vertical section view of the hip prosthesis of figure 1;
figure 3 is an exploded view of the hip prosthesis of figure 1;
figures 4a and 4b show the operation of the prosthesis according to the invention during the flexion;
figures 5a and 5b show the operation of the prosthesis according to the invention during the adduction; and figures 6a and 6b show the operation of the prosthesis according to the invention during the extension.
Observing first the figures 1 - 3 of the enclosed drawings, it is shown a preferred embodiment of the hip prosthesis according to the invention, which is generically indicated by the reference number 1.
The prosthesis according to the invention comprises a plurality of elements, among which a stem 2, that is implanted within the femur 3 (see figure 2).
Said stem 2 is realised in such a way to obtain a truncated cone sealing, or cemented, or of a different kind, and it is comprised of metallic material, such as titanium alloy, or AISI 316 L stainless steel, or any other anti-rejection material.
By the reference number 4 it is indicated a femoral head, that is coupled with the stem 2 by thread 5 with a truncated cone coupling. Said femoral head 4 is comprised of metallic material, such as titanium alloy, or AISI 316 L stainless steel, or ceramic material, or any other anti-rejection material.

WO 01/06960 CA 02379789 2002-0l-25 PCT/IT00/00284 When the stem 2 and the femoral 4 are implanted (figure 2), their locking each other occurs by the locking screw 6, preferably comprised of metallic material, such as AISI 316 L stainless steel.
BY the reference number 7, it is indicated the acetabular cotyle, that is implanted in the pelvis by screws" or it is cemented, or fixed, or fixed in any other way. The acetabular cotyle 7 is comprised of metallic material, such as titanium alloy, or AISI 316 L stainless steel, or any other anti-rejection material.
Between the femoral head 4 and the acetabular cotyle 7 it is provided the anti friction acetabular cup 8, that is kept into the acetabular cotyle 7 by the ring of the acetabular cup 8. It is comprised of non-toxic polyammidic material according to the F.D.A. rules N° C.F.R. 177.2415 and the UE rules N° 9011281E.E.C., or of ceramic material or any other anti-rejection material.
It is further provided a ring 9 of the anti dislocation sealing acetabular cup 8. Said rig is fixed to the acetabular cotyle 7 by screws 10.
The ring 9 is comprised of non-toxic polyammidic material according to the F.D.A. rules N° C.F.R. 177.2415 and the UE rules N°
90/128/E.E.C..
Said screws 10 are preferably flared head screws, preferably comprised of metallic material, such as AISI 316 L stainless steel or titanium alloy, or any other anti-rejection material.
In figures 4a and 4b it is shown the flexion functionality of the prosthesis 1 according to the invention allowing to reach a flexion angle of 127°.
In figures 5a and 5b it is shown the flexion functionality of the prosthesis 1 according to the invention allowing to reach an adduction angle of 50°.
In figures 6a and 6b it is shown the flexion functionality of the prosthesis 1 according to the invention allowing to reach an extension angle of 42°.
The structure of the prosthesis according to the invention is such that, even the above mentioned gait values are passed, dislocation does not occur in the already mentioned standard conditions.
In this way, the person subjected to a surgical intervention obtains a better safety condition. The fact that the dislocation does not occur is due particularly to the presence of the containment rings 9 of the femoral heads 4, opposing a controlled resistance, established before by WO 01/06960 CA 02379789 2002-0l-25 PCT/IT00/00284 the orthopaedic surgeon, for example with a value between 500 g and 15 kg, or higher, in function of the patient weight.
However, in case the above values and stresses are passed, dislocation occurs, since it is necessary to save the integrity of the 5 osseous tissue on which the prosthesis is implanted.
The solution according to the invention allows an easy "closed view" reduction of the prosthesis 1, i.e. without surgical intervention, as occurs in case of dislocation of the known prosthesis, with a general anaesthesia.
The reduction of the prosthesis according to the invention only requires a specialistic orthopaedic intervention, that is carried out lengthening the lower limb and its extension according to the adduction direction for about 30°. In this way, prosthesis 1 according to the invention are easily reduced since the femoral heads 4 in that point have the spherical profile comprised of a ring shaped bas-relief having such dimensions to freely allow the reductions in the acetabular cups 8 without any stress.
After the reduction of the prosthesis, functionality and stability are not modified with respect to the original condition.
Another remarkable advantage obtained by the prosthesis 1 according to the invention concerns the implantology intervention.
In fact, by the prosthesis according to the invention (figure 2), in the upper portion of the femur, a vertical truncated cone vertical hole is realised, and a cylindrical hole is realised in the portion of the collum femoris without the necessity of carrying out any excavation and rescission of the upper portion of the femur.
The present invention has been described for illustrative but not limitative purposes, according to its preferred embodiments, but it is to be understood that modifications andlor changes can be introduced by those skilled in the art without departing from the relevant scope as defined in the enclosed claims.

Claims (11)

1. Anti-dislocation bilateral hip prosthesis (1), comprising a stem (2), that is introduced within a corresponding vertical hole realised into the femur, a femoral head (4), having a special end, that is inserted within a corresponding hole realised into the collum femoris, and that couples with said stem, said femoral head having a joint spherical end and an acetabular cotyle (7), implanted in the pelvis, said prosthesis being characterised in that an anti friction acetabular cup (8) is provided between said acetabular cotyle and said spherical end of the femoral head (4), said anti friction acetabular cup (8) being kept within the acetabular cotyle (7) by a ring (9), and in that a groove is provided on said spherical end of the femoral head (4).
2. Anti-dislocation bilateral hip prosthesis (1) according to claim 1, characterised in that said stem (2) has a truncated cone section.
3. Anti-dislocation bilateral hip prosthesis, (1) according to one of the preceding claims, characterised in that said stem (2) is comprised of metallic material, such as titanium alloy, or AISI 316 L stainless steel, or any other anti-rejection material.
4. Anti-dislocation bilateral hip prosthesis (1) according to one of the preceding claims, characterised in than said femoral head (4) is coupled with said stem (2) by threading (5), truncated cone coupling, etc.
5. Anti-dislocation bilateral hip prosthesis (1) according to one of the preceding claims, characterised in that said femoral head (4) is comprised of metallic material, such as titanium alloy, or AISI 316 L
stainless steel, or ceramic material, or any other anti-rejection material.
6. Anti-dislocation bilateral hip prosthesis (1) according to one of the preceding claims, characterised in that for the fixing of the femoral head (4) to the stem (2), a locking screw (6) is provided, acting along the axis of the stem.
7. Anti-dislocation bilateral hip prosthesis (1) according to one of the preceding claims, characterised in that said acetabular cotyle (7) is implanted in the pelvis by screws, or it is cemented, or fixed, or fixed in any other way.
8. Anti-dislocation bilateral hip prosthesis (1) according to one of the preceding claims, characterised in that said acetabular cotyle (7) is comprised of metallic material, such as titanium alloy, or AISI 316 L
stainless steel, or any other anti-rejection material.
9. Anti-dislocation bilateral hip prosthesis (1) according to one of the preceding claims, characterised in that said anti friction acetabular cup (8) is comprised of non-toxic polyammidic material according to F.D.A.
rules N° C.F.R. 177.2415 and the UE N° 90/128/E.E.C., or of ceramic material or any other anti-rejection material.
10. Anti-dislocation bilateral hip prosthesis (1) according to one of the preceding claims, characterised in that said ring (9) provided between the acetabular cup (8) and the femoral head (4) is fixed to the acetabular cotyle (7) by screws (10).
11.Anti-dislocation bilateral hip prosthesis (1) according to one of the preceding claims, characterised in that said ring (9) is comprised of non-toxic polyammidic material according to the F.D.A. rules N° C.F.R.
177.2415 and the UE rules N° 90/128/E.E.C.,
CA002379789A 1999-07-27 2000-07-11 Anti-dislocation bilateral hip prosthesis Abandoned CA2379789A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT1999FR000014A IT1316060B1 (en) 1999-07-27 1999-07-27 ANTI-LUXURY BILATERAL HIP PROSTHESIS.
ITFR99A000014 1999-07-27
PCT/IT2000/000284 WO2001006960A1 (en) 1999-07-27 2000-07-11 Anti-dislocation bilateral hip prosthesis

Publications (1)

Publication Number Publication Date
CA2379789A1 true CA2379789A1 (en) 2001-02-01

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CA002379789A Abandoned CA2379789A1 (en) 1999-07-27 2000-07-11 Anti-dislocation bilateral hip prosthesis

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EP (1) EP1196117A1 (en)
JP (1) JP2003505147A (en)
AU (1) AU5847200A (en)
CA (1) CA2379789A1 (en)
IL (1) IL147546A0 (en)
IT (1) IT1316060B1 (en)
WO (1) WO2001006960A1 (en)

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CN104840277B (en) * 2015-05-22 2017-09-29 中奥汇成科技股份有限公司 A kind of manual acetabulum outer cup
CN104874019A (en) * 2015-05-22 2015-09-02 中奥汇成科技股份有限公司 Artificial joint femoral stem

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AU5847200A (en) 2001-02-13
ITFR990014A0 (en) 1999-07-27
IL147546A0 (en) 2002-08-14
IT1316060B1 (en) 2003-03-28
EP1196117A1 (en) 2002-04-17
ITFR990014A1 (en) 2001-01-27
JP2003505147A (en) 2003-02-12
WO2001006960A1 (en) 2001-02-01

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