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
  • A61F2/34—Acetabular cups
• • 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
  • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
  • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
  • A61F2002/30772—Apertures or holes, e.g. of circular cross section
  • A61F2002/30784—Plurality of holes
  • A61F2002/30787—Plurality of holes inclined obliquely with respect to each other
• • 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
  • A61F2/34—Acetabular cups
  • A61F2002/3401—Acetabular cups with radial apertures, e.g. radial bores for receiving fixation screws
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • 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
  • A61F2002/3401—Acetabular cups with radial apertures, e.g. radial bores for receiving fixation screws
  • A61F2002/3403—Polar aperture
• • 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
  • A61F2/34—Acetabular cups
  • A61F2002/345—Acetabular cups the inner and outer (hemi)spherical surfaces of a shell, e.g. an intermediate shell, having distinct centres of rotation, both located on the centre line of the shell
• • 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
  • A61F2/34—Acetabular cups
  • A61F2002/3469—Acetabular cups with non-radial inner bores or canals
• • 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
  • A61F2/46—Special tools for implanting artificial joints
  • A61F2/4603—Special tools for implanting artificial joints for insertion or extraction of endoprosthetic joints or of accessories thereof
  • A61F2002/4629—Special tools for implanting artificial joints for insertion or extraction of endoprosthetic joints or of accessories thereof connected to the endoprosthesis or implant via a threaded connection

Definitions

• the present invention relates generally to an acetabular cup implanted in a natural acetabulum and more particularly, the eccentric position of a socket within the acetabular cup and bevel of the anterior rim for use with a prosthetic femoral head to provide a more natural anatomic placement and function.
• Jumbo cups provide a large surface area for fixation to the bone and have better long term implant stability when using cementless fixation rather than cemented fixation. These jumbo cups restore the center of rotation of the hip more toward its anatomical location as compared to smaller cups that are placed into a superior bone defect above the anatomic acetabulum. Although current jumbo cups tend to have the socket of the cup centered within the metal shell, the cup is larger than the anatomic acetabulum which still causes the center of rotation of the hip joint to be higher than is ideal biomechanically. [0006] Since current jumbo cups are larger than the anatomic dimensions of the native acetabulum, a portion of the rim of the cup often protrudes from the bone.
• This protrusion can cause impingement and irritation with the surrounding soft tissue such as the iliopsoas tendon, causing groin pain.
• This soft tissue impingement occurs most often on the anterior portion of the cup after being implanted into a natural acetabulum However, soft tissue impingement can occur in more than just the anterior location.
• acetabular cup that can provide a more natural anatomical center of rotation while allowing for greater fixation in the acetabulum
• the cup should have the ability to use multiple cup liners or none at all.
• the cup should also reduce impingement on surrounding soft tissue.
• Figure 1 illustrates an anterior side view of a complete hip assembly, with a pelvic bone, femur, femoral head prosthetic and an acetabular cup;
• Figure 2 illustrates an enlarged anterior side view of the complete hip assembly of
• Figure 3 illustrates a side view of the complete hip assembly of Figure 1 without the human anatomy
• Figure 4 illustrates a side view of the acetabular cup of Figure 1 with a first relief on one end of the cup, a first geometric center axis of the cup and an aperture configured to receive an inserter instrument;
• Figure 5 illustrates a bottom view of the acetabular cup of Figure 4 with an eccentric socket and apertures configured to receive screws;
• Figure 6 illustrates a bottom perspective view of the acetabular cup of Figure 4 with a socket, socket liner and a second geometric center axis of the socket;
• Figure 7 illustrates a top perspective view of the acetabular cup of Figure 4 with a plurality of apertures configured to receive screws and the inserter instrument aperture;
• Figure 8 illustrates an alternate side view of the acetabular cup of Figure 4 with a plurality of apertures and a first relief on one end of the cup;
• Figure 9 illustrates a bottom perspective view of the acetabular cup of Figure 6 with the cup liner removed from the socket;
• Figure 10 illustrates an alternate side view of the acetabular cup of Figure 4 substantially as it would be positioned in an acetabulum showing a first relief and a plurality of apertures;
• Figure 11 illustrates a side view of the acetabular cup of Figure 4 with a plurality of screws passing through the plurality of apertures;
• Figure 12 illustrates a top view of the acetabular cup of Figure 12 with the plurality of screws passing through some of the plurality of apertures.
• the present invention relates to systems and methods for acetabular cups; for securing a cup into a natural acetabulum and providing a more natural center of rotation and a more natural anatomic fit with a natural or prosthetic femoral head
• acetabular cups for securing a cup into a natural acetabulum and providing a more natural center of rotation and a more natural anatomic fit with a natural or prosthetic femoral head
• One embodiment of the present invention includes an acetabular cup with a first relief on first end of the cup, an eccentric socket within the cup and a plurality of apertures to allow for passage of a plurality of screws.
• the cup further comprises a an outer wall with a first geometric center and a socket with a second geometric center separate from the first geometric center configured to receive a natural or prosthetic femoral head.
• the eccentric socket provides a center of rotation for the femoral head in a more natural anatomic location.
• the cup further comprises a cup rim between the socket and the outer wall with a first relief and multiple apertures around the cup rim.
• the socket may be configured to receive a liner with a bearing surface to contact the femoral head.
• the socket may also provide a bearing surface configured to interact with the femoral head without a liner.
• the cup is positioned within a natural acetabulum or host bone and the socket provides securement of the femoral head while the first relief reduces impingement of the acetabular cup on soft tissue.
• the first relief reduces soft tissue impingement without decreasing the contact surface area of the cup for fixation with the host bone. With the combination of the eccentric location of the liner socket, the first relief does not reduce the contact area between the cup and liner or the liner and the femoral head.
• a "relief means a portion of an acetabular cup or hemispherical cup that has been removed to reduce impingement of the cup on soft tissue.
• an acetabular cup 10 which may be substantially hemispherical or dome shaped which may allow implantation with standard hemispherical reamers, is positioned in an acetabulum 4 of a pelvic bone 2.
• a prosthetic femoral head 5 is position in a socket 14 of the acetabular cup 10 the femoral head 5 extends from a prosthetic hip stem 3which has been positioned within a femur 1 of a patient. It will be appreciated that a prosthetic femoral head and hip stem are not required and a natural femur with a natural or resurfaced femoral head positioned within the acetabular cup 10 may also be used.
• the acetabular cup 10 comprises an outer wall 22 and a cup rim 26.
• the acetabular cup 10 outer wall 22 may include a porous coating to allow or encourage bone ingrowth.
• the outer wall 22 may comprise a plurality of apertures 16, 28, 30 (cup rim apertures 30 not shown) configured in a plurality of directions.
• the outer wall 22 may comprise an inserter aperture 29 which may be larger than the plurality of apertures 28.
• the inserter aperture 29 may threadably receive an inserter instrument (not pictured) for inserting the acetabular cup 10 into the acetabulum 4.
• Each of the apertures 16, 28, 30 is configured to receive at least one screw 18.
• the screw 18 may be threaded and may include a locking screw that locks into the cup 10, a bone screw or a morse/taper screw.
• the screw 18 may also include a nail or other devices known in the art may be used to pass through the apertures 16, 28, 30 to further secure the acetabular cup 10 to the acetabulum 4.
• a plurality of screws 18 may be used to secure the acetabular cup 10 to the acetabulum 4.
• the screws may be completely embedded in the pelvic bone.
• Alternate embodiments of securement of the acetabular cup 10 to the inserter instrument may include more than one aperture configured to connect to the inserter.
• the inserter instrument aperture(s) 29 may be smooth and alternate mechanism for fixation of the inserter to the acetabular cup may include snap fit, press fit, collet, or bayonet fixation.
• FIG. 1 Other embodiments of securement of the acetabular cup 10 to the acetabulum 4 may include press fitting the cup within the acetabulum 4, heating the cup 10 before placing the cup 10 within the acetabulum 4 allowing the cup 10 to expand as it cools within the acetabulum.
• the outer wall 22 of the acetabular cup 10 comprises a first geometric center axis 34 substantially perpendicular to the cup rim 26 as well as a first end 20 and a second end 24 located opposite the first end 20 of the cup 10.
• a portion of the cup rim 26 defines a first relief 12 displaced toward the first end 20.
• the cup rim 26 extends from the socket 14 to the outer wall 22 of the acetabular cup 10.
• the socket 14 may have the ability to accommodate a cup liner 32 with a liner bearing surface 42 to interact with the femoral head 5.
• the shape of the acetabular cup lOand socket 14 may allow a plethora of standard cup liners 32 to be used, including, but not limited to constrained liners, unconstrained liners, and liners made from a variety of materials including, but not limited to ultra high molecular weight polyethylene, other polymer bearing materials, metal bearing materials, or ceramic bearing materials.
• the socket 14 may also comprise a socket bearing surface 44 to interact with the femoral head 5 without a cup liner 32.
• the cup rim 26 may comprise two surfaces a first surface 38 and a second surface 40.
• the first surface of the cup rim extends from the socket 14 to the outer wall 22 in a first plane.
• the second surface extends from the socket 14 to the outer wall 22 in a second plane which is non-parallel with the first plane.
• the cup rim may also comprise a plurality of rim apertures 30 configured to receive screws 18.
• the cup rim apertures 30 may be substantially perpendicular to the cup rim 26.
• the cup rim apertures 30 may extend parallel, non-parallel or skew to the first geometric center axis 34.
• the cup rim apertures 30 may be smooth to allow for passage of the screw 18 or threaded to threadably receive the screw.
• the first relief 12 may also comprise first relief apertures 16 which may be perpendicular to the first relief 12.
• the first relief apertures 16 may extend substantially toward the first geometric center axis 34, away from the first geometric center axis 34 or skew from the first geometric center axis 34.
• the first relief apertures 16 may also be threaded or smooth as set forth previously herein.
• the socket comprises a second geometric center axis 36 which may be substantially parallel to the first geometric center axis 34.
• the second geometric center axis 36 is displaced from the first geometric center axis 34 defining a substantially eccentric socket 14 within the acetabular cup 10.
• the eccentric socket 14 is displaced closer to the second end 24 of the cup 10 and further displaced from the first end 20.
• the position of the socket 14 creates a center of rotation of the either natural or prosthetic femoral head 5 toward a natural anatomic location after implantation of the acetabular cup in an acetabulum 4 and after placement of the femoral head 5 in the socket 14.
• the socket 14 may maintain a standard concentric cup liner 32 as stated previously herein.
• the first relief 12 the contact area between the cup 10 and the liner 32 or between the liner 32 and the femoral head 5 is not reduced.
• the combination of features allows the femoral head 5 to be fully constrained in the anatomic position.
• the acetabular cup 10 may include further constraint of the femoral head 5 by using a modular rim component (not shown).
• the plurality of apertures 16, 28, 30 is displaced about the outer wall 22 with varying distances between each other and the cup rim 26.
• the apertures 16, 28, 30 may vary in size as may the screw's 18 (not shown) size.
• the cup liner 26 is removed from the socket to show the socket bearing surface 44 which may interact either with a cup liner 32 or the femoral head 5.
• the plurality of apertures 16, 28, 30 are shown with socket apertures 30 positioned within the socket 14 at varying distances from each other and from the cup rim 26.
• the socket apertures may be threaded in the case of screw 18 fixation or may be smooth in the case of an alternate form of fixation, for example a nail.
• the illustration depicts the acetabular cup 10 positioned substantially as it would be within the acetabulum 4.
• the first relief 12 is positioned substantially anterior within a patient and substantially anterior to the socket 14 of the cup 10.
• the plurality of apertures 16, 28, 30 are positioned to point in various directions including parallel to the first geometric center axis 34, pointing toward the axis of the first geometric center 34, or point away from the axis of the first geometric center 34, to provide adequate fixation of the cup 10 to the acetabulum 4.
• the trajectory of the screws 18 is demonstrated in various directions. Some of the screws 18 may be directed toward the first geometric center axis 34 whereas other screws 18 are directed parallel with the first geometric center axis 34 or directed away from first geometric center axis 34.
• the acetabular cup 10 may be comprised of many different materials including titanium, cobalt chrome, stainless steel, ceramic or other biocompatible material.
• the outer coating of the cup 10 may be porous and may be comprised of titanium, cobalt chrome, polymer or other biocompatible material.
• the cup 10 may be a combination of different biocompatible materials.
• the cup 10 may be cobalt chrome with a titanium porous coating on the outer wall 22.
• the method for inserting the acetabular cup 10 into the acetabulum 4 may include attaching an inserter (not shown) to the acetabular cup within the socket 14.
• the inserter is offset from the first geometric center axis 34, offset relative to the outer wall 22 of the acetabular cup 10, because the inserter is attached to the offset or eccentric socket 14.
• the cup may then be inserted into the acetabular space of the acetabulum and positioned such that the socket 14 center is placed toward a natural anatomic location and the first geometric center axis 34 of the outer wall 22 of the acetabular cup 10 is positioned superior the second geometric center axis 36.
• the acetabular cup 10 may then be secured to the acetabulum by any method previously described or any other method known in the art.
• the inserter may then be detached from the acetabular cup 10.
• An alternate embodiment of the acetabular cup 10 may include the relief 12 being positioned, within the acetabulum 4, either substantially superior, substantially inferior or substantially posterior. Furthermore the acetabular cup may include more than one relief. Such multiple reliefs may intersect along the cup rim 26 or may have a portion of the cup rim 26 between each of the reliefs.
• cup rim may include a symmetric or non-symmetric bevel on opposite ends of the acetabular cup essentially removing portions of the cup rim.
• the cup rim may also have a single bevel on one end of the cup which may be on one face of the cup opposite the cup liner. Alternatively the cup rim may have a bevel added on top of the cup rim.

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• 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)

Priority Applications (5)

Applications Claiming Priority (6)

Publications (2)

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ID=42981602

Family Applications (1)

Country Status (7)

Cited By (2)

Families Citing this family (18)

Citations (3)

Family Cites Families (33)

• 2009
  • 2009-06-04 US US12/478,260 patent/US8211184B2/en active Active
• 2010
  • 2010-04-06 WO PCT/US2010/030041 patent/WO2010123677A2/en not_active Ceased
  • 2010-04-06 EP EP10767499.6A patent/EP2421474B1/en active Active
  • 2010-04-06 AU AU2010239614A patent/AU2010239614C1/en active Active
  • 2010-04-06 CN CN201080020271.3A patent/CN102438554B/zh active Active
  • 2010-04-06 JP JP2012507242A patent/JP5706395B2/ja active Active
  • 2010-04-06 CA CA2758795A patent/CA2758795C/en active Active
• 2012
  • 2012-02-17 US US13/399,173 patent/US8574306B2/en active Active

Patent Citations (3)

Non-Patent Citations (1)

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