WO2005087142A2 - Rotatable head of enarthrotic prosthesis - Google Patents

Rotatable head of enarthrotic prosthesis Download PDF

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Publication number
WO2005087142A2
WO2005087142A2 PCT/IL2005/000281 IL2005000281W WO2005087142A2 WO 2005087142 A2 WO2005087142 A2 WO 2005087142A2 IL 2005000281 W IL2005000281 W IL 2005000281W WO 2005087142 A2 WO2005087142 A2 WO 2005087142A2
Authority
WO
WIPO (PCT)
Prior art keywords
prosthesis
enarthrotic
head
stem
base member
Prior art date
Application number
PCT/IL2005/000281
Other languages
French (fr)
Other versions
WO2005087142A3 (en
Inventor
Amit Mor
Original Assignee
Amit Mor
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 Amit Mor filed Critical Amit Mor
Priority to CA002559349A priority Critical patent/CA2559349A1/en
Priority to EP05718854A priority patent/EP1734905A2/en
Publication of WO2005087142A2 publication Critical patent/WO2005087142A2/en
Publication of WO2005087142A3 publication Critical patent/WO2005087142A3/en
Priority to IL177990A priority patent/IL177990A0/en

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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
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • 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
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    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • 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
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    • 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
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
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    • A61F2/367—Proximal or metaphyseal parts of 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
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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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    • 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
    • A61F2002/30362—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
    • 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
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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
    • A61F2002/30362—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
    • A61F2002/30365—Rotation about the common longitudinal axis with additional means for limiting said rotation
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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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    • A61F2002/30316—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
    • A61F2002/30462—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements retained or tied with a rope, string, thread, wire or cable
    • 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
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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
    • A61F2002/30535—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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    • 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
    • A61F2/02—Prostheses implantable into the body
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    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
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    • A61F2/02—Prostheses implantable into the body
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • 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
    • A61F2310/00011—Metals or alloys
    • A61F2310/00029—Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
    • 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
    • A61F2310/00035—Other metals or alloys
    • A61F2310/00059—Chromium or Cr-based 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
    • 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
    • A61F2310/00389—The prosthesis being coated or covered with a particular material
    • A61F2310/00592—Coating or prosthesis-covering structure made of ceramics or of ceramic-like compounds
    • A61F2310/00796—Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite

Definitions

  • the present invention relates generally to surgical prostheses, and particularly to prostheses for an enarthrosis, such as a femoral prosthesis for use in total hip replacements, hemiarthroplasty and the like.
  • a femoral prosthesis for use in total hip replacements, hemiarthroplasty and the like.
  • Hip replacements are a common orthopedic surgical procedure and are usually necessitated by degenerative disease of the hip joint, hip trauma or disease of the hip creating later hip trauma.
  • the swgical procedure may involve reaming of the acetabulum, reaming of the proximal medullary cavity of the femur and inserting a prosthesis into the medullary cavity to replace the natural femoral head.
  • the head of the prosthesis (usually formed by a detachable ceramic ball) mates with the acetabulum in the same manner that the natural femoral head mates with the acetabulum in a normal hip joint. Not all cases require a complete hip replacement.
  • hemiartliroplasty only the femoral head requires replacement, such as, for example, in repairing a fractured neck of the femur.
  • One generally known and widely used prosthesis typically comprises an arcuate distal shaft having a gradual taper along its full length and terminating proximally in a neck which mates with the head of the prosthesis via a Morse taper.
  • the shaft is inserted into the intramedullary cavity of the femur. It is important to achieve proper alignment or anteversion (tilting) between the prosthesis head and the acetabulum. This requires considerable skill on the part of the surgeon with very little margin for error.
  • Femoral prostheses have been developed which, allow adjusting the angular relationship between the femoral head and the intramedullary shaft of the prosthesis, in an effort to achieve proper alignment or anteversion of the femoral head of the prosthesis and the acetabulum. Examples of such prostheses are described in US Patent 5,580,352 to Sekel. Examples of commercially available femoral prostheses include the MARGRON brand of femoral prostheses from Portland Orthopedics Inc. These prostheses have a femoral head that may be rotated with respect to the intramedullary shaft of the prosthesis.
  • the present invention seeks to provide an improved prostheses for an enarthrosis, such as a femoral prosthesis for use in total hip replacements, hemiartliroplasty and the like, as is described in detail further hereinbelow.
  • the invention is described hereinbelow for a femoral prosthesis, but it is understood that the invention is not limited to a hip joint and may be carried out on any kind of enarthrosis (ball-and-socket joint).
  • the femoral prosthesis has a femoral head that may be rotated with respect to the intramedullary shaft of the prosthesis even after final placement in the patient.
  • some femoral prostheses have been prone to unwanted reverse rotational withdrawal from the femoral medullary cavity.
  • a rotational failure of the prosthesis can be generated when a patient moves from a sitting to a standing position.
  • Other disruptions in the anteversion between the femoral head and the acetabulum can occur. It has surprisingly been found that permitting rotation of the femoral head with the respect to the shaft may actually help prevent the above problems and result in a much more stable joint.
  • Figs. 1 and 2 are simplified illustrations of an enarthrotic prosthesis, constructed and operative in accordance with an embodiment of the present invention, with a head member in different angular orientations with a respect to a stem member; and Fig. 3 is a simplified, partially sectional illustration of the enarthrotic prosthesis of Fig. l.
  • Figs. 1 and 2 illustrate an enarthrotic prosthesis 10, constructed and operative in accordance with an embodiment of the present invention.
  • the femoral prosthesis 10 may include a head member 12 comprising an at least partially spherical ball 14 mounted on a post 16 extending from a base member 18.
  • the base member 18 is rotatingly seated in a stem member 20, which may include an intramedullary shaft adapted to be placed in an intramedullary cavity (of the femur, for example).
  • the femoral prosthesis 10 may be constructed of any suitable material for bone or joint prostheses, such as but not limited to, titanium, chrome cobalt and the like.
  • Ball 14 may be constructed, without limitation, of similar materials or ceramic, for example.
  • the femoral prosthesis 10 may be coated with a material that enhances adhesion with bone, such as but not limited to, hydroxyapatite.
  • the bearing surfaces between the base member 18 and stem member 20 may be Finished with a surface finish that promotes rotational freedom between the parts.
  • bearing elements 22 may be placed at an interface between the base member 18 and stem member 20, such as but not limited to, ball bearings, roller elements and the like. In such an arrangement, the head member 12 may rotate through any angular range with respect to the stem member 20, as indicated by arrow 24 in Fig. 2.
  • the rotation of head member 12 with respect to stem member 20 may be controlled or limited by a biasing device 26 (Fig. 3), such as but not limited to, coil springs, leaf springs, elastomeric bands or rings, and the like, placed between the base member 18 and stem member 20.
  • a biasing device 26 Fig. 3
  • femoral prosthesis 10 is shown installed in a femur.
  • the installation may include first performing neck resection, followed by reaming, milling and tapping of the femur, after which the stem member 20 is screwed or otherwise installed in the intramedullary cavity of the femur.
  • the head member 12 is then installed in the stem member 20.

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)

Abstract

An enarthrotic prosthesis (10) characterized by a head member (12) including an at least partially spherical ball (14) extending from a base member (18), the base member (18) rotatingly seated in a stem member (20), wherein the head member (12) is rotatable with respect to the stem member (20) even after installation in a patient.

Description

ROTATABLE HEAD OF ENARTHROTIC PROSTHESIS FIELD OF THE INVENTION The present invention relates generally to surgical prostheses, and particularly to prostheses for an enarthrosis, such as a femoral prosthesis for use in total hip replacements, hemiarthroplasty and the like. BACKGROUND OF THE INVENTION Hip replacements are a common orthopedic surgical procedure and are usually necessitated by degenerative disease of the hip joint, hip trauma or disease of the hip creating later hip trauma. In a total hip replacement, the swgical procedure may involve reaming of the acetabulum, reaming of the proximal medullary cavity of the femur and inserting a prosthesis into the medullary cavity to replace the natural femoral head. The head of the prosthesis (usually formed by a detachable ceramic ball) mates with the acetabulum in the same manner that the natural femoral head mates with the acetabulum in a normal hip joint. Not all cases require a complete hip replacement. In hemiartliroplasty, only the femoral head requires replacement, such as, for example, in repairing a fractured neck of the femur. There are many hip prostheses that have been used to replace the femoral head. One generally known and widely used prosthesis typically comprises an arcuate distal shaft having a gradual taper along its full length and terminating proximally in a neck which mates with the head of the prosthesis via a Morse taper. The shaft is inserted into the intramedullary cavity of the femur. It is important to achieve proper alignment or anteversion (tilting) between the prosthesis head and the acetabulum. This requires considerable skill on the part of the surgeon with very little margin for error. Femoral prostheses have been developed which, allow adjusting the angular relationship between the femoral head and the intramedullary shaft of the prosthesis, in an effort to achieve proper alignment or anteversion of the femoral head of the prosthesis and the acetabulum. Examples of such prostheses are described in US Patent 5,580,352 to Sekel. Examples of commercially available femoral prostheses include the MARGRON brand of femoral prostheses from Portland Orthopedics Inc. These prostheses have a femoral head that may be rotated with respect to the intramedullary shaft of the prosthesis. Once the head has been properly aligned with the intramedullary shaft, the head is tightly secured in place, typically with a screw, prior to final placement in the patient. SUMMARY OF THE INVENTION The present invention seeks to provide an improved prostheses for an enarthrosis, such as a femoral prosthesis for use in total hip replacements, hemiartliroplasty and the like, as is described in detail further hereinbelow. The invention is described hereinbelow for a femoral prosthesis, but it is understood that the invention is not limited to a hip joint and may be carried out on any kind of enarthrosis (ball-and-socket joint). Unlike the prior art, the femoral prosthesis has a femoral head that may be rotated with respect to the intramedullary shaft of the prosthesis even after final placement in the patient. In the prior art, some femoral prostheses have been prone to unwanted reverse rotational withdrawal from the femoral medullary cavity. In some cases, a rotational failure of the prosthesis can be generated when a patient moves from a sitting to a standing position. Other disruptions in the anteversion between the femoral head and the acetabulum can occur. It has surprisingly been found that permitting rotation of the femoral head with the respect to the shaft may actually help prevent the above problems and result in a much more stable joint. BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be understood and appreciated more fully from the following detailed description taken in conjunction with the drawings in which: Figs. 1 and 2 are simplified illustrations of an enarthrotic prosthesis, constructed and operative in accordance with an embodiment of the present invention, with a head member in different angular orientations with a respect to a stem member; and Fig. 3 is a simplified, partially sectional illustration of the enarthrotic prosthesis of Fig. l. DETAILED DESCRIPTION OF EMBODIMENTS Reference is now made to Figs. 1 and 2, which illustrate an enarthrotic prosthesis 10, constructed and operative in accordance with an embodiment of the present invention. As mentioned before, the description follows for a femoral prosthesis 10, but it is understood that the invention is not limited to a hip joint and may be carried out on any kind of enarthrosis. The femoral prosthesis 10 may include a head member 12 comprising an at least partially spherical ball 14 mounted on a post 16 extending from a base member 18. The base member 18 is rotatingly seated in a stem member 20, which may include an intramedullary shaft adapted to be placed in an intramedullary cavity (of the femur, for example). The femoral prosthesis 10 may be constructed of any suitable material for bone or joint prostheses, such as but not limited to, titanium, chrome cobalt and the like.
Ball 14 may be constructed, without limitation, of similar materials or ceramic, for example. The femoral prosthesis 10 may be coated with a material that enhances adhesion with bone, such as but not limited to, hydroxyapatite. The bearing surfaces between the base member 18 and stem member 20 may be Finished with a surface finish that promotes rotational freedom between the parts. Additionally or alternatively, bearing elements 22 may be placed at an interface between the base member 18 and stem member 20, such as but not limited to, ball bearings, roller elements and the like. In such an arrangement, the head member 12 may rotate through any angular range with respect to the stem member 20, as indicated by arrow 24 in Fig. 2. In accordance with a non-limiting embodiment of the present invention, the rotation of head member 12 with respect to stem member 20 may be controlled or limited by a biasing device 26 (Fig. 3), such as but not limited to, coil springs, leaf springs, elastomeric bands or rings, and the like, placed between the base member 18 and stem member 20. In the illustrated embodiment, femoral prosthesis 10 is shown installed in a femur. As is well known in the art, the installation may include first performing neck resection, followed by reaming, milling and tapping of the femur, after which the stem member 20 is screwed or otherwise installed in the intramedullary cavity of the femur. The head member 12 is then installed in the stem member 20. It is appreciated that various features of the invention which are, for clarity, described in the contexts of separate embodiments, may also be provided in combination in a single embodiment. Conversely, various features of the invention which are, for brevity, described in the context of a single embodiment, may also be provided separately or in any suitable subcombination.

Claims

CLAIMSWhat is claimed is:
1. An enarthrotic prosthesis (10) characterized by: a head member (12) comprising an at least partially spherical ball (14) extending from a base member (18), said base member (18) rotatingly seated in a stem member (20), wherein said head member (12) is rotatable with respect to said stem member (20) even after installation in a patient.
2. The enarthrotic prosthesis (10) according to claim 1, wherein said head member (12) rotates with respect to said stem member (20) after installation in a patient.
3. The enarthrotic prosthesis (10) according to claim 1, wherein bearing surfaces between said base member (18) and said stem member (20) are finished with a surface finish that promotes rotational freedom therebetween.
4. The enarthrotic prosthesis (10) according to claim 1, further comprising bearing elements (22) placed at an interface between said base member (18) and said stem member (20).
5. The enarthrotic prosthesis (10) according to claim 1, wherein rotation of said head member (12) with respect to said stem member (20) is controlled by a biasing device (26) placed between said base member (18) and said stem member (20).
6. The enarthrotic prosthesis (10) according to claim 1, wherein said stem member (20) comprises an intramedullary shaft adapted to be placed in an intramedullary cavity.
7. The enarthrotic prosthesis (10) according to claim 1, wherein said at least partially spherical ball (14) is mounted on a post (16) extending from said base member (18).
8. The enarthrotic prosthesis (10) according to claim 1, wherein said prosthesis (10) is coated with a material that enhances adhesion with bone.
PCT/IL2005/000281 2004-03-11 2005-03-10 Rotatable head of enarthrotic prosthesis WO2005087142A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA002559349A CA2559349A1 (en) 2004-03-11 2005-03-10 Rotatable head of enarthrotic prosthesis
EP05718854A EP1734905A2 (en) 2004-03-11 2005-03-10 Rotatable head of enarthrotic prosthesis
IL177990A IL177990A0 (en) 2004-03-11 2006-09-10 Rotatable head of enarthrotic prosthesis

Applications Claiming Priority (2)

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US55179204P 2004-03-11 2004-03-11
US60/551,792 2004-03-11

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Cited By (6)

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FR2922436A1 (en) * 2007-10-17 2009-04-24 Levon Doursounian FEMORAL ELEMENT OF HIP PROSTHESIS, AND TOTAL HIP PROSTHESIS COMPRISING IT.
DE202010005333U1 (en) 2010-04-29 2010-06-24 Aesculap Ag Endoprosthesis, in particular for an artificial hip joint, and hip prosthesis
DE102010016695A1 (en) * 2010-04-29 2011-11-03 Aesculap Ag Endoprosthesis for use in hip implant at hip region of patient, has coupling element acting in axial direction and gripped at proximal and distal parts, so that proximal part is held at distal part in unlocked position
US9861493B2 (en) 2015-08-14 2018-01-09 Gerhard E. Maale Glenoid fossa prosthesis
US10485669B2 (en) 2015-04-07 2019-11-26 Gerhard E. Maale Prosthesis surface treatment and method for soft tissue attachment thereto
US10485670B2 (en) 2015-08-14 2019-11-26 Gerhard E. Maale Glenoid fossa prosthesis

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CN106913395B (en) * 2015-12-25 2019-02-19 重庆润泽医药有限公司 A kind of bion hip joint
CN106913404B (en) * 2015-12-25 2019-02-19 重庆润泽医药有限公司 A kind of compound hip joint
CN113813086B (en) * 2021-08-27 2024-09-06 重庆熙科医疗科技有限公司 Individuation shoulder joint prosthesis and assembly method

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EP0524874A1 (en) * 1991-07-24 1993-01-27 Hades Joint prosthesis, especially trapezoid-metacarpal and digital joint
DE4337922A1 (en) * 1993-11-06 1995-05-11 Ilmenauer Implantate Manufaktu Joint prosthesis
FR2717071A1 (en) * 1994-03-11 1995-09-15 Procerati Joint prosthesis esp. for finger
US5725597A (en) * 1995-11-09 1998-03-10 Hwang; Sung Kwan Artificial hip-joint

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Publication number Priority date Publication date Assignee Title
EP0524874A1 (en) * 1991-07-24 1993-01-27 Hades Joint prosthesis, especially trapezoid-metacarpal and digital joint
DE4337922A1 (en) * 1993-11-06 1995-05-11 Ilmenauer Implantate Manufaktu Joint prosthesis
FR2717071A1 (en) * 1994-03-11 1995-09-15 Procerati Joint prosthesis esp. for finger
US5725597A (en) * 1995-11-09 1998-03-10 Hwang; Sung Kwan Artificial hip-joint

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2922436A1 (en) * 2007-10-17 2009-04-24 Levon Doursounian FEMORAL ELEMENT OF HIP PROSTHESIS, AND TOTAL HIP PROSTHESIS COMPRISING IT.
WO2009053650A2 (en) * 2007-10-17 2009-04-30 Levon Doursounian Femoral component for a hip prosthesis, and total hip prosthesis comprising same
WO2009053650A3 (en) * 2007-10-17 2009-07-16 Levon Doursounian Femoral component for a hip prosthesis, and total hip prosthesis comprising same
DE202010005333U1 (en) 2010-04-29 2010-06-24 Aesculap Ag Endoprosthesis, in particular for an artificial hip joint, and hip prosthesis
DE102010016695A1 (en) * 2010-04-29 2011-11-03 Aesculap Ag Endoprosthesis for use in hip implant at hip region of patient, has coupling element acting in axial direction and gripped at proximal and distal parts, so that proximal part is held at distal part in unlocked position
US10485669B2 (en) 2015-04-07 2019-11-26 Gerhard E. Maale Prosthesis surface treatment and method for soft tissue attachment thereto
US11426284B2 (en) 2015-04-07 2022-08-30 Gerhard E. Maale Modular rotational device for torsionally stabilizing an endoprosthesis
US11974926B2 (en) 2015-04-07 2024-05-07 Onkos Surgical, Inc. Prosthesis surface treatment for soft tissue attachment thereto
US9861493B2 (en) 2015-08-14 2018-01-09 Gerhard E. Maale Glenoid fossa prosthesis
US10485670B2 (en) 2015-08-14 2019-11-26 Gerhard E. Maale Glenoid fossa prosthesis
US11344422B2 (en) 2015-08-14 2022-05-31 Gerhard E. Maale Glenoid fossa prosthesis

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CN1972645A (en) 2007-05-30
EP1734905A2 (en) 2006-12-27
WO2005087142A3 (en) 2005-10-20
CA2559349A1 (en) 2005-09-22

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