WO2008044229A1 - Articulation artificielle - Google Patents

Articulation artificielle Download PDF

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Publication number
WO2008044229A1
WO2008044229A1 PCT/IL2007/000389 IL2007000389W WO2008044229A1 WO 2008044229 A1 WO2008044229 A1 WO 2008044229A1 IL 2007000389 W IL2007000389 W IL 2007000389W WO 2008044229 A1 WO2008044229 A1 WO 2008044229A1
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WO
WIPO (PCT)
Prior art keywords
joint
components
artificial
ferrofluid
artificial joint
Prior art date
Application number
PCT/IL2007/000389
Other languages
English (en)
Inventor
Leonid Zusman
Original Assignee
Ofer Vexler
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 Ofer Vexler filed Critical Ofer Vexler
Publication of WO2008044229A1 publication Critical patent/WO2008044229A1/fr

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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
    • 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
    • A61F2310/00011—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
    • A61F2310/00089—Zirconium or Zr-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
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00179—Ceramics or ceramic-like structures
    • A61F2310/00185—Ceramics or ceramic-like structures based on metal oxides
    • A61F2310/00239—Ceramics or ceramic-like structures based on metal oxides containing zirconia or zirconium oxide ZrO2
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2430/00—Materials or treatment for tissue regeneration
    • A61L2430/24—Materials or treatment for tissue regeneration for joint reconstruction

Definitions

  • the present invention relates to the field of medicine and in particular to the field of orthopedics. Even more particularly the present invention concerns prosthetic devices, which are used for partial or total replacement of mammal's joints or for treatment of chronic conditions, like arthritis etc.
  • the present invention refers to a new and improved artificial joint implants for replacement of the human knee or hip joints. It should be born in mind, however that the present invention is not limited strictly to knee and hip joints and that it can be implemented for replacement of any other artificial joints, where it is required to improve lubrication between articulated components, like ankles, elbows, wrists, finger joints, toe joints, intervertebral discs etc.
  • the present invention refers also to a new method for lubricating of joint components.
  • FIGs 1-3 show the peculiarities associated with the known in the art artificial joints.
  • Fig.l it is shown a healthy human knee joint and the same joint damaged e.g. by osteoarthritis, rheumatoid arthritis or trauma.
  • a layer of synovial fluid lubricates the two opposite bones of the joint and a flat layer of cartilage tissue ensures that this lubricating layer is distributed homogeneously across the articulated surfaces of the joint components.
  • Fig.2 it is shown an example of artificial knee joint used in the replacement surgery.
  • This surgery allows replacement of up to three bone components by respective metallic components.
  • the metallic components replace correspondingly the femoral component of the joint, the tibial component and the patella component. It is seen that the replacement metallic femoral component embraces the end of the thighbone and it is configured with interior groove so the kneecap can move up and down smoothly against the bone as the knee bends and straightens.
  • the replacement tibial component is configured as a flat metal platform covered by a polyethylene cushion.
  • the cushion may be an integral part of the platform or be separate there from and it can be configured either with a flat surface or a raised, sloping surface.
  • the replacement patellar component is configured as a dome shaped piece of polyethylene that duplicates the shape of the kneecap anchored to a flat metal plate.
  • the femoral head fits into concaved depression in the acetabulum component (socket).
  • the femoral component can smoothly move with respect to the acetabulum component by virtue of synovial fluid deployed between the femoral head as a thin layer, which efficiently lubricates the joint during motion.
  • the surfaces of the bones where the ball and socket rub together are very smooth and covered by a tough cartilage tissue, which preserves the homogeneity of the layer of the synovial fluid.
  • the cartilage tissue is displaced and homogeneity of the lubrication layer is deteriorated.
  • Eventually functioning of the joint may become painful as the surfaces become worn due to friction.
  • -patient must avoid "impact loading” sports such as jogging, downhill skiing etc.; -patient must consult with his surgeon before beginning any new sport or activity;
  • WO9619163 there are known various attempts to reduce friction between implant components of the artificial joints.
  • the roller bearing knee replacement joint is provided with a femoral component positioned for articulation on a tibial component.
  • the articulated surface of the tibial component has replaceable roller bearing units, which reduce friction between the components.
  • the seal may surround the periphery of the joint components.
  • Various lubricating fluids are applicable, including water or aqueous solutions, triglyceride oil, soybean oil, inorganic oil, glycerin, ethylene glycol or other animal, vegetable, synthetic oil or their combination. Still similar approach, based on retaining of the lubricating liquid between the joint components is disclosed in US6692529, which describes a hip replacement system having fat lubricant.
  • the system includes a socket and a ball member affixed within the socket.
  • the boll member is affixed to a stem and the stem is formed with a channel extending there along.
  • the exterior of the ball member has at least one opening communicating with the channel.
  • a fat lubricant fills a space between the exterior of the ball member and the cavity.
  • ferrofluids which are used in certain engineering applications for reducing friction between components of a friction couple.
  • a ferrofluid is a stable colloidal suspension of sub-domain magnetic particles distributed within a liquid carrier.
  • the particles which have an average size of about lOOAngstrom (IOnm)
  • IOnm lOOAngstrom
  • the surfactant should be matched to the carrier type and be capable to overcome the van der Vaals attraction and magnetic forces between the particles.
  • the colloidal and thermal stability of a ferrofluid which might be crucial to many applications, are greatly influenced by the choice of the surfactant.
  • a typical ferrofluid may contain by volume 5% magnetic solid particles (usually Fe 3 O 4 ), 10% surfactant (usually dextran) and 85% of a base fluid, i.e. liquid carrier.
  • the structure of a typical ferrofluid is schematically presented in Fig.4. In the absence of magnetic field, the magnetic moments of the particles are randomly distributed and the fluid has no magnetization. When a magnetic field is applied to a ferrofluid, the magnetic moments of the particles orient along the lines of the magnetic field almost instantly. In the magnetic field having a gradient the ferrofluid responds as a homogeneous magnetic liquid, which moves to the region of the highest flux.
  • ferrofluid has the fluid properties of a liquid and the magnetic properties of a sol id and it can be precisely positioned and controlled by the external magnetic field.
  • the forces holding the magnetic fluid in the same position are proportional to the gradient of the external field and magnetization value of the fluid.
  • the low friction bearing arrangement includes first and second poles of magnetically permeable material defining first and second pole surfaces, which are spaced apart.
  • the pole surfaces define also the first and second side surfaces, which are aligned and a shaft is provided, which is located out of contact with the side surfaces.
  • a ferrrofluid is positioned between the shaft and the side surfaces and is held adjacent the first and the second side surfaces by means of a fringing magnetic flux established between the side surfaces.
  • ferrofluids for sealing a shaft and a hub for a disk hard drive is described in WO 00/43698.
  • the idea of the present invention is to reduce friction between components of an artificial joint by providing continuous layer of lubricating fluid between articulated surfaces of the joint implant components.
  • the lubricating fluid comprises a stable ferrofluid suspension, which is kept between the articulated surfaces by virtue of magnetic field.
  • the main object of the invention which is achievable by virtue of the above solution, is to decrease drastically abrasion and wear in artificial joint implants, and thus to increase joint durability and to improve its shock-absorbing property. Still further object of the invention is to provide artificial joint in which the lubricating fluid can be easily and conveniently replenished by injecting a portion of the fresh ferrofluid between the articulated surfaces without necessity in a surgical operation.
  • Another object of the invention is to provide artificial joint, which has reduced wear without modifying the joint design and/or the process of its manufacturing.
  • the present invention can be implemented as artificial joint and as method for lubricating articulated surfaces of an artificial joint.
  • the artificial joint comprises at least two articulated joint components implantable within a body of a patient, said components are relatively displaceable with respect to each other and a layer of a lubricating fluid is deployed between the components, wherein said layer is constantly retained between the joint components to prevent dry friction between the components irrespective of their mutual disposition.
  • said lubricating fluid is a ferrofluid and the joint is provided with a source of magnetic field, which retains the ferrofluid between the articulated surfaces of the joint components.
  • said magnetic field has intensity directed perpendicular to the articulated surfaces of the components.
  • said source of magnetic field is at least one permanent magnet.
  • said permanent magnet is configured as a solid plate locatable within at least one joint component.
  • said source of magnetic field is capable to produce magnetic field with intensity 28-52MGoe.
  • said ferrofluid is suspension of magnetizable particles within a biologically compatible carrier fluid.
  • the magnetizable particles are iron oxide particles having an average particle size of about 10 nm.
  • a magnetic saturation in the range of 400-900 Gauss defines the magnetizable particles.
  • said carrier fluid is selected from the group consisting of medical grade silicone or hyaluronate solution or carboxymethyl cellulose solution.
  • a surface-active material coats the magnetizable particles.
  • the carrier fluid is defined by a viscosity of 50-600 centistokes and a vapor pressure of 10 '5 - 10 "10 Torr at 37 degrees C.
  • Fig.l is a schematic illustration of distribution of synovial fluid in an ostheoarthritic knee joint and in a normal knee joint;
  • Fig.2 shows schematically an artificial knee joint
  • Fig.3 shows a ball and socket artificial hip joint
  • Fig.4 depicts schematically structure of a ferrofluid
  • Fig.5 shows schematically structure of a friction pair provided with lubricating layer in accordance with the invention:
  • Fig.6 shows schematically an embodiment of the present invention implemented as an artificial knee joint
  • Fig.7 shows schematically an embodiment of the present invention implemented as an artificial hip joint
  • Figs.5a-5d it is schematically shown the idea of the present invention.
  • a first component 10 of a pair of friction e.g. configured as socket implant component of a hip artificial joint.
  • an insert 12 is located, which is made of material capable to produce constant magnetic field shown as plurality of arrows 14. Since the implant component has bowed configuration, but the insert has rectilinear configuration the magnetic field is not homogeneous and has maximum magnetic strength in the middle part of the component, where the arrow has its maximum length.
  • Fig.5b is shown that in accordance with the invention a layer of ferrofluid 16 is deployed on the inwardly facing surface of the implant component and lubricates it.
  • the lubricating layer changes its thickness and configuration according to the diagram of magnetic strength and it is seen that it has its maximum thickness where the magnetic strength is maximal.
  • Fig.5c and 5d is shown the first component and a second component 18 of the pair of friction, e.g. configured as socket and ball implant of an artificial hip joint.
  • the magnetic insert 12 is located within the first component and produces magnetic field, which retains ferrofluid 16 between opposite articulated surfaces of the first and the second component. It is seen that although the second component is somewhat displaced from the middle of the first component either at right as in Fig. 5c or at left as in Fig. 5d, nevertheless thin layer of the ferrofluid is always retained by the magnetic insert and lubricates the articulated surfaces of both components.
  • the magnetic insert can be rigid or flexible.
  • the rigid magnetic insert can be manufactured by consolidating shaped magnetic particles by methods of powder metallurgy. Mixing of magnetic particles with suitable filler like rubber or plastic powder and consequent shaping, e.g. pressing can make the flexible insert.
  • the shape of the insert can be different, e.g.
  • an anti-corrosion coating e.g. gold coating
  • the magnetic insert must be located inside the joint implant component within a dedicated recess provided in the implant. Upon placing the insert within the recess it has to be closed by a cover.
  • the cover should not change the shape of the implant. After closing the cover should be reliably secured on the implant, for example, by welding. It is necessary to take into consideration that during welding the implant and the insert should not be heated over the Curie point, namely 800-850 degrees C for SmCo magnet and 160 degrees C for NdFeB magnet.
  • the welding seam must be located remote from the friction area and it has to be polished.
  • the ferrofluid should be deployed between the articulated surfaces of the joint implant components and it should have the following properties: 1) complete biocompatibility; 2)high lubrication properties;
  • the ferrofluid layer should have an optimal thickness to ensure minimal coefficient of friction between the articulated surfaces. In practice it should have thickness 0.005-0.24 mm depending on the type of the ferrofluid.
  • the ferrofluid must be located as close as possible to the magnetic insert;
  • the reason for the last requirement lies in the fact that force of attraction between two permanent magnets is inverse proportional to the third power of the distance between them.
  • the distance, which should be taken into consideration for assessment of the attraction force is the distance between the insert surface and the ferrofluid surface.
  • Example 1 use of ferrofluid lubricant in artificial knee joint implants.
  • Fig. 6 it is shown typical artificial knee joint, having femoral implant component 20 associated with femur 22 and having stemmed tibial plate implant component 24 associated with tibia 26.
  • the tibial plate component is provided with a plastic cushion 28 made of polyethylene and facing towards low extremity of the femoral component.
  • the upwardly facing surface of the plastic cushion and the downwardly facing surface of the femoral component constitute articulated surfaces ASl and AS2. It can be readily appreciated that if no lubricant is placed between the articulated surfaces ASl and AS2 dry friction followed by wear will take place when both joint implant components are relatively displaced.
  • patella 30 is seen that is provided with lateral surface facing towards lateral wall 32 of the femoral component. Accordingly these lateral surfaces constitute additional articulated surfaces AS3, AS4. It can be realized that dry friction may take place if no lubricant is placed between the articulated surfaces AS3,AS4.
  • a layer of ferrofluid 34 is deployed at least between the surfaces AS1,AS2 and at least one magnetic insert 36 is placed within the tibial plate component.
  • the layer of the ferrofluid between the articulated components should have thickness not less than 5 micron.
  • the magnetic insert is located. within a dedicated depression 35 made within the tibial plate component and a cover 37 closes this depression as explained above. It is advantageous if similar arrangement is available between the articulated surfaces AS3, AS4 as well. This arrangement is shown in Fig. 6 and it is seen that it comprises a layer of ferrofluid 38 and magnetic insert 40 located within appropriate depression 39 made in patella. It should be borne in mind, however, that two such arrangements are not compulsory.
  • Such magnetic inserts manufactures, for example, company YuXiang Magnetic Materials (China).
  • the inserts should produce magnetic field directed perpendicular to their flat butt sides.
  • Polyethylene or metal covers, adapted for hermetically sealing the depressions, should cover the magnetic inserts. The hermetical seam must be polished, in order not to deteriorate the implant shape.
  • ferrofluid As suitable ferrofluid one can use suspension of Fe 3 O 4 paramagnetic particles, having 10 nm average size and about 600 Gauss saturation magnetization. The particles should be covered by a surfactant, e.g. dextran or carbon biocompatible surfactants.
  • a surfactant e.g. dextran or carbon biocompatible surfactants.
  • suitable carrier fluid one can use hyaloronate solution.
  • This ferrofluid lubricant can be deployed between the articulated surfaces of the joint knee implant during surgical knee replacement operation, which is the same as a typical knee replacement operation.
  • Example 2 use of ferrofluid lubricant in artificial hip joint implants. With reference to Fig. 7 it is shown typical artificial hip joint, having metallic femoral component 42, terminating by a ball-like femoral head extremity 44.
  • the hip joint is provided also with a cup-like acetabulum implant component 46, which can be made of high molecular weight plastic material, e.g. polyethylene.
  • the acetabulum component and the femoral head extremity constitute mutually a pair of friction and they are provided with respective articulated surfaces AS5, AS6. It can be readily appreciated that if no lubricant is placed between the articulated surfaces AS5 and AS6 dry friction followed by wear will take place when femur implant component and acetabulum component is relatively displaced.
  • a layer of ferrofluid 48 is deployed between the articulated surfaces S5, S6 and a magnetic insert 50 is located within the acetabulum component.
  • This magnetic insert produces magnetic field, which retains the ferrofluid between the articulated surfaces irrespective of the mutual disposition of the respective joint components.
  • the thickness of the ferrofluid layer should be not less than 5 micron thickness.
  • an additional magnetic insert 52 can be located within the lower extremity of the femur component. This insert is intended for retaining additional layer
  • the magnetic insert can be configured as flat disc having diameter 20 mm and height 8 mm.
  • the magnetic field produced by the insert should be directed substantially perpendicularly to the flat butt sides of the magnetic insert.
  • These magnetic insert is located within a suitable depression made in the acetabulum implant component.
  • the depression is hermetically sealable by a cover preferably made from the same material as the acetabulum component.
  • the ferrofluid placed between the articulated surfaces can be biocompatible ferrofluid lubricant having the following properties: Carrying fluid: medical grade silicone.
  • Fig.8 results of testing carried out on Biaxial Rocking Motion hip simulator at room temperature.
  • the testing was conducted on artificial hip joint implant similar to that shown in Fig.7 and described in Example 1.
  • the testing was carried out at the following conditions:
  • Frictional torque was monitored during the testing. For comparison the same testing was conducted on hip joint implant with lubricating layer of silicone based ferrofluid, with lubricating layer of silicone lubricant deposited by spraying and without lubricating layer at all.
  • the thickness of the ferrofluid lubricating layer was 50micron and the thickness of the sprayed lubricating layer was 80 micron.
  • the corresponding mean values of the frictional torque were 0.075 Nxm (silicone based ferrofluid lubricating layer), 0.2 Nxm (silicone based sprayed lubricating layer) and 2.1 Nxm (no lubricating layer)
  • this invention can be implemented for replacement of any other artificial joints, where it is required to improve lubrication between articulated components, like ankles, elbows, wrists, finger joints, toe joints etc.
  • the terms "permanent magnet”, “magnetic” etc. refer to any materials, which are source of magnetic field without external permanent magnet or without other sources of external magnetic field.
  • Non-limiting examples of such materials are NdFeB 5 SmCo magnets, ferrite ceramics, AlNiCo magnets, semi-hard magnets etc.
  • ferrofluid refers to any suspension comprising magnetic particles coated by surfactant for prevention their agglomeration and distributed in liquid carrier medium.
  • joint implant refers to any device, that is placeable in a patient' s body and which has a primary function such as treatment of disease or disorder.
  • Non-limiting examples of such functional implants are joint knee implants and joint hip implants.
  • articulated means refers to any pair of components or surfaces constituting a joint.
  • wear means mechanical removal of material from the surface of an object caused by friction with other relatively movable object.
  • shock absorbed material is any material, which can operate as a damper.
  • the term “durability of the implant” refers to its functional service life.
  • biocompatible refers to such material, which do not provoke biological organism's reaction after introducing of such material into organism.
  • biocompatible is pertinent to joint implant components, to magnetic insert and to ferrofluid.
  • '"biocompatible materials comprise 316L stainless steel, cobalt-chrome alloy, biocompatible organic coating on the ferrofluid nanoparticles, such as metacrylated dextran, carbon or fibrin.

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Public Health (AREA)
  • General Health & Medical Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Engineering & Computer Science (AREA)
  • Vascular Medicine (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Biomedical Technology (AREA)
  • Cardiology (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Chemical & Material Sciences (AREA)
  • Dermatology (AREA)
  • Medicinal Chemistry (AREA)
  • Epidemiology (AREA)
  • Prostheses (AREA)

Abstract

L'invention concerne une articulation humaine artificielle présentant des frottements réduits entre ses éléments d'articulation articulés (10, 18) en raison d'une couche lubrifiante constituée d'un ferrofluide (16) retenue entre les éléments. La couche est maintenue constamment en place par un champ magnétique produit par un insert magnétique (12) situé dans au moins l'un des éléments d'articulation.
PCT/IL2007/000389 2006-10-10 2007-03-26 Articulation artificielle WO2008044229A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US85005106P 2006-10-10 2006-10-10
US60/850,051 2006-10-10

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WO2008044229A1 true WO2008044229A1 (fr) 2008-04-17

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Application Number Title Priority Date Filing Date
PCT/IL2007/000389 WO2008044229A1 (fr) 2006-10-10 2007-03-26 Articulation artificielle

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WO2014052152A1 (fr) * 2012-09-27 2014-04-03 Elwha Llc Composants d'articulation artificielle incluant des champs magnétiques intégraux configurés pour dévier des particules de débris d'usure
US8795378B2 (en) 2012-09-27 2014-08-05 Elwha Llc Artificial joint components including synovial fluid deflecting structures and particle retaining structures
US8845739B2 (en) 2012-09-27 2014-09-30 Elwha Llc Artificial joint components including mechanized synovial fluid deflecting structures
US9387080B2 (en) 2012-09-27 2016-07-12 Elwha Llc Artificial joint components including synovial fluid deflecting structures
US10507111B2 (en) 2018-03-09 2019-12-17 Stephen Bramblett Johnson Magnetic prosthetic
US10685771B1 (en) 2019-03-08 2020-06-16 Light Steering Technologies, Llc Magnetic joint and optical mount using the same
WO2020185195A1 (fr) * 2019-03-08 2020-09-17 Light Steering Technologies, Llc Articulation magnétique et monture optique l'utilisant
US10830988B2 (en) 2017-09-17 2020-11-10 Light Steering Technologies, Llc Laterally unconstrained magnetic joint for tip tilt and piston-tip-tilt mounts

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US5725597A (en) * 1995-11-09 1998-03-10 Hwang; Sung Kwan Artificial hip-joint
US5755807A (en) * 1996-06-17 1998-05-26 Folsom Metal Products Implant module unit and rotating seal for prosthetic joint
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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013068014A1 (fr) * 2011-11-08 2013-05-16 Danmarks Tekniske Universitet Compositions pharmaceutiques comprenant des lubrifiants pour prévenir ou réduire le descellement aseptique chez un sujet
US9387080B2 (en) 2012-09-27 2016-07-12 Elwha Llc Artificial joint components including synovial fluid deflecting structures
US9387081B2 (en) 2012-09-27 2016-07-12 Elwha Llc Artificial joint components including synovial fluid deflecting structures and particle retaining structures
US8828081B2 (en) 2012-09-27 2014-09-09 Elwha Llc Artificial joint components including synovial fluid deflecting structures
US8845739B2 (en) 2012-09-27 2014-09-30 Elwha Llc Artificial joint components including mechanized synovial fluid deflecting structures
US9398955B2 (en) 2012-09-27 2016-07-26 Elwha Llc Artificial joint components including mechanized synovial fluid deflecting structures and particle retaining structures
US8845741B2 (en) 2012-09-27 2014-09-30 Seavete LLC Artificial joint components including integral magnetic fields configured to deflect wear debris particles
US8795378B2 (en) 2012-09-27 2014-08-05 Elwha Llc Artificial joint components including synovial fluid deflecting structures and particle retaining structures
WO2014052152A1 (fr) * 2012-09-27 2014-04-03 Elwha Llc Composants d'articulation artificielle incluant des champs magnétiques intégraux configurés pour dévier des particules de débris d'usure
US8845740B2 (en) 2012-09-27 2014-09-30 Elwha Llc Artificial joint components including mechanized synovial fluid deflecting structures and particle retaining structures
US9398954B2 (en) 2012-09-27 2016-07-26 Elwha Llc Artificial joint components including mechanized synovial fluid deflecting structures
US10830988B2 (en) 2017-09-17 2020-11-10 Light Steering Technologies, Llc Laterally unconstrained magnetic joint for tip tilt and piston-tip-tilt mounts
US10507111B2 (en) 2018-03-09 2019-12-17 Stephen Bramblett Johnson Magnetic prosthetic
US11617653B2 (en) 2018-03-09 2023-04-04 Stephen Bramblett Johnson Magnetic prosthetic
US10685771B1 (en) 2019-03-08 2020-06-16 Light Steering Technologies, Llc Magnetic joint and optical mount using the same
WO2020185195A1 (fr) * 2019-03-08 2020-09-17 Light Steering Technologies, Llc Articulation magnétique et monture optique l'utilisant
AU2019434706B2 (en) * 2019-03-08 2023-06-15 Light Steering Technologies, Inc. Magnetic joint and optical mount using the same

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