US20010018617A1 - Prosthetic part - Google Patents
Prosthetic part Download PDFInfo
- Publication number
- US20010018617A1 US20010018617A1 US09/853,855 US85385501A US2001018617A1 US 20010018617 A1 US20010018617 A1 US 20010018617A1 US 85385501 A US85385501 A US 85385501A US 2001018617 A1 US2001018617 A1 US 2001018617A1
- Authority
- US
- United States
- Prior art keywords
- section
- anchorage
- plate section
- indentation
- indentations
- 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
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Classifications
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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
- 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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- 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
- A61B17/82—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin for bone cerclage
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- 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
- A61F2/30721—Accessories
- A61F2/30739—Devices connected to the proximal part of an endoprosthetic femoral shaft for reinforcing or replacing the trochanters, e.g. the greater trochanter
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- 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
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
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- 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
- A61F2/367—Proximal or metaphyseal parts of shafts
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- 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
- A61F2/3676—Distal or diaphyseal parts of shafts
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
- A61F2/4607—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof of hip femoral endoprostheses
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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
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- A61F2/4644—Preparation of bone graft, bone plugs or bone dowels, e.g. grinding or milling bone material
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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
- A61F2/28—Bones
- A61F2002/2835—Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material
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- 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
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30108—Shapes
- A61F2002/3011—Cross-sections or two-dimensional shapes
- A61F2002/30112—Rounded shapes, e.g. with rounded corners
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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
- A61F2002/30108—Shapes
- A61F2002/3011—Cross-sections or two-dimensional shapes
- A61F2002/30138—Convex polygonal shapes
- A61F2002/30153—Convex polygonal shapes rectangular
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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
- A61F2002/30108—Shapes
- A61F2002/30199—Three-dimensional shapes
- A61F2002/30224—Three-dimensional shapes cylindrical
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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
- A61F2002/30108—Shapes
- A61F2002/30199—Three-dimensional shapes
- A61F2002/30273—Three-dimensional shapes pyramidal
- A61F2002/30276—Three-dimensional shapes pyramidal frustopyramidal
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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
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- A61F2002/30317—The prosthesis having different structural features at different locations within the same prosthesis
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- A61F2002/30317—The prosthesis having different structural features at different locations within the same prosthesis
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- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
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- A61F2002/30561—Special structural features of bone or joint prostheses not otherwise provided for breakable or frangible
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- A61F2002/30602—Shaft made of a bundle of anchoring rods or bristles, e.g. fasciculate shaft
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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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- 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
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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
- A61F2220/0075—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements sutured, ligatured or stitched, retained or tied with a rope, string, thread, wire or cable
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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
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- A61F2230/0004—Rounded shapes, e.g. with rounded corners
-
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- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
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- A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
- A61F2250/0036—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in thickness
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- A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
- A61F2250/0039—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in diameter
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- A61F2250/0058—Additional features; Implant or prostheses properties not otherwise provided for
- A61F2250/0096—Markers and sensors for detecting a position or changes of a position of an implant, e.g. RF sensors, ultrasound markers
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- 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
- A61F2310/00952—Coating, pre-coating or prosthesis-covering structure made of bone cement, e.g. pre-applied PMMA cement mantle
Definitions
- the invention relates to a prosthetic part to be implanted into the end of a thighbone adjacent to the hip joint and an anchorage section that is introducable into a bone-recess.
- a prosthetic part having a plate section having a substantially rectangular marginal contour seen from above is developed further in such a way that removal of the prosthetic part from the thighbone is possible without removing parts of the cortical substance.
- this object is achieved by means of a prosthetic part wherein two longitudinal edges of the plate section are each provided with at least one opening or at least one indentation, and the at least one opening or the at least one indentation is elongated and extends parallel to an edge of the plate section.
- the object of the invention also is achieved by a prosthetic part having an anchorage section that is introducable into a bone recess, said anchorage section comprising at least partially a cage structure; a plate section that extends in a lateral direction beyond the anchorage section; and a supporting section for a joint part.
- the plate section is provided with at least one opening or at least one indentation in the vicinity of the edges of the plate section through which a severing instrument is introducable to cut a connection between the anchoring section and corticalis substance of a bone.
- the at least one opening or that at least one indentation is elongated and extends parallel to an edge of the plate section.
- the plate section comprises a marginal region having a circumferential arrangement of indentations.
- That the circumferential arrangement of indentations comprises a succession of indentations of differing depths.
- passages are present or can easily be created by removing webs of material located beneath indentations or by drilling the supporting plate free, through which passages a chisel or a slender milling cutter can be guided. In this way a slit can be produced in the section of the spongy substance adjacent to the cortical substance, as a result of which the cohesion between the spongy substance that has grown into the cage structure and the cortical substance is weakened.
- the bridges of spongy substance leading to the cortical substance that cannot be removed by the chisel or by the milling cutter can then be broken up by mechanical loading of the prosthetic part (e.g., impact and/or twisting, with application of considerable force). After this, the prosthetic part can be taken out of the bone.
- the volume of spongy substance that has grown in is inseparable from the cortical substance of the bone on the two principal surfaces.
- a further development of the invention permits an incision to be produced in the volume of spongy substance, which may extend practically over the entire surface of contact with the cortical substance. In this way it is possible for the prosthetic part to be removed in a straightforward manner.
- a further feature of the invention is with regard to particularly rapid opening of the depression, whereby a secure and load-bearing connection of the edge of the plate section to the interior of the plate section is guaranteed by virtue of the depressions having only slight depth.
- the web of material can be removed by means of a milling cutter, whereby the walls of the depression may serve as a guide for the milling cutter.
- a further feature of the invention permits the setting angle of the chisel or milling cutter, which is introduced into an opening or into an opened depression to be varied.
- a drill for drilling free the points of attachment of the anchorage pillars pertaining to the cage structure can be simply and precisely aligned with the axis of an anchorage pillar.
- FIG. 1 a lateral view of a prosthetic part for an artificial hip joint
- FIG. 2 a view of the right side of the prosthetic part shown in FIG. 1;
- FIG. 3 a transverse section through a depression which is provided in a near-edge region of a plate section of a modified prosthetic part;
- FIG. 4 a longitudinal section through the depression provided in a near-edge region of a plate section of the modified prosthetic part according to FIG. 3;
- FIG. 5 a similar view to FIG. 4 but wherein a depression having little depth is reproduced
- FIG. 6 a top view of the plate section of a further modified prosthetic part which is provided in the marginal region of the plate section with a succession of depressions of differing depths;
- FIG. 7 a view similar to FIG. 1, wherein a further modified prosthetic part is shown.
- FIG. 1 Designated overall by 10 in FIG. 1 is a prosthetic part which serves for implantation into the upper end of a thighbone 12 indicated by a dashed line. To this end the upper section of the thighbone 12 which bears the condyle is resected and a recess 14 corresponding to the clear outer contour of the prosthetic part 10 is produced in the thighbone.
- the prosthetic part 10 has supporting plate 16 which comprises a horizontal plate section 18 and a plate section 20 ascending obliquely upwards to the trochanter major. Molded onto the plate section 18 is a trunnion 22 ascending obliquely upwards, onto which a condyle 24 indicated by a dashed line is capable of being mounted.
- a cage structure which is designated overall by 26 .
- This cage structure consists of four curved longitudinal anchorage pillars 28 , 30 , 32 , 34 which substantially predetermine the shape of a curved pyramid having a rectangular transverse cross-section. From the upper end of the plate section 18 there emanate two curved additional anchorage pillars 36 , 38 , the configuration of which is adapted to the trochanter major of the thighbone (femur) and which have a smaller spacing from one another than the adjacent anchorage pillars 32 and 34 .
- the anchorage pillars and the stiffening pillars each have a cylindrical core 46 with axially spaced anchorage collars 48 .
- the cores 46 of the anchorage pillars typically have a diameter of 2.0-4.5 mm, the diameters of the anchorage collars are each about 0.8-1.5 mm larger than the diameter of the cores.
- the axial extent of the anchorage collars amounts to about 0.6-1.2 mm, their spacing from one another amounts to about 3-6 mm.
- the cores may have a diameter of about 1.5-3.0 mm, the diameters of the anchorage collars may be about 0.6-1.2 mm larger that the core diameter, and the axial dimension of the anchorage collars may amount to about 0.5-1.0 mm, their axial spacing to about 2.0-4.0 mm.
- a shaft section 50 Cast onto the lower end of the cage structure 26 is a shaft section 50 .
- the latter has an olive-shaped end section 52 .
- a drill hole 54 extends through the interior of the shaft section 50 .
- the end of the thighbone is resected as described above, the upper edge of the cortical substance being given a contour corresponding to the marginal contour of the supporting plate 16 .
- the bone material removed from the end of the bone in the course of preparation of the recess 14 is ground in a bone mill and poured into the cage structure 26 .
- the outer surface of the shaft section 50 is coated with a cement.
- the prosthetic part 10 is then inserted into the end of the thighbone 12 , so that the supporting plate 16 now forms a new upper termination for the bone.
- the prosthetic part 10 is then temporarily fixed with wire.
- the prosthetic part 10 is connected to the upper end of the thighbone in partially loadable manner.
- the ground spongy substance coalesces and fills out the cage structure, at the same time growing up against the cortical substance and residues of spongy substance that have remained on the cortical substance.
- the shaft section 50 may not be coated with cement, a possibility which is advantageous with regard to easier later removal of the prosthetic part.
- elongated openings 60 , 62 are provided in the vicinity of the longitudinal edges of the supporting plate 16 .
- a thin, slender chisel can be guided through said openings after the prosthetic part 10 has healed in, in order in each case to chisel free one of the two principal surfaces of the cage structure 26 .
- bridges of spongy substance remain, via which the cage structure remains connected to the cortical substance in the vicinity of the upper comers of the supporting plate 16 and on the narrow sides of the cage structure.
- the supporting plate 16 normally seals the upper end of the thighbone 12 completely but that access to the two principal surfaces of the cage structure 26 should nevertheless be possible, instead of openings it is possible, according to FIGS. 3 and 4, to work with indentations 64 in the supporting plate 16 which, seen in top view, have the same geometry as the openings 60 , 62 shown in FIGS. 1 and 2.
- the indentations 64 have a thin bottom wall 66 , which has the desired barrier effect, but on the other hand they can easily be mechanically destroyed by the chisel which serves to chisel the cage structure 26 free.
- the lateral walls of the indentations 64 or of the openings that are later created from said indentations or of openings that are present from the very beginning are convex, as represented at 68 .
- FIG. 5 use may be made of such indentations in which the bottom wall 66 makes up an appreciable part of the thickness of the supporting plate 16 , so that the indentations 64 do not have a negative influence on the mechanical strength of the marginal region of the supporting plate 16 , so that the indentations 64 do not have a negative influence on the mechanical strength of the marginal region of the supporting plate 16 .
- This design of the indentations 64 permits several such indentations 64 permits several such indentations to be distributed along the edge of the supporting plate 16 , as a result of which a larger part of the interface between cage structure 26 and cortical substance of the thighbone 12 is made accessible.
- removal of the bottom wall 66 is effected by means of a milling cutter of suitable width, said milling cutter being guided by the walls of the indentation 64 parallel to the edge of the supporting plate 16 .
- an arrangement of indentations 64 a and 64 b may be provided on the upper side of the supporting plate 16 continuously following the edge, the bottom walls 66 a and 66 b of said indentations being thin and thick, respectively.
- the bottom wall of the entire indentation arrangement can then be opened rapidly by means of a milling cutter which once again is positively guided parallel to the edge of the supporting plate 16 by the walls of the indentations, but under usage conditions a very loadable connection formed by the bottom walls 66 b arms exists between the edge of the supporting plate 16 and the principal section thereof.
Abstract
A prosthetic part includes an anchorage section that is introducable into a bone recess, the anchorage section comprising at least partially a cage structure, a plate section that extends in a lateral direction beyond the anchorage section, and a supporting section for a joint part. The plate section is provided with at least one opening or at least one indentation, through which a severing instrument is introducable to cut a connection between the anchoring section and corticalis substance of a bone. The plate section has a marginal region having a circumferential arrangement of indentations, and the at least one opening or the at least one indentation is elongated and extends parallel to an edge of the plate section.
Description
- This application is a Divisional of U.S. Patent application Ser. No. 09/155,837, filed Jun. 1, 1999, of the same inventor.
- Not applicable.
- Technical Field
- The invention relates to a prosthetic part to be implanted into the end of a thighbone adjacent to the hip joint and an anchorage section that is introducable into a bone-recess.
- A prosthetic part of this type is described in DE 37 07 518 A1.
- After such a prosthetic part has been implanted, spongy substance grows between the anchorage pillars of the cage structure, as a result of which the anchorage section of the prosthetic part is dynamically and firmly connected to the end of the thighbone. After they have healed into the bone, prosthetic parts of this type which can be implanted without the use of cement are so firmly connected to the bone that removal which may possibly become necessary often necessitates opening of the sections of the cortical substance of the bone adjacent to the anchorage section.
- By means of the present invention a prosthetic part having a plate section having a substantially rectangular marginal contour seen from above is developed further in such a way that removal of the prosthetic part from the thighbone is possible without removing parts of the cortical substance.
- In accordance with the invention this object is achieved by means of a prosthetic part wherein two longitudinal edges of the plate section are each provided with at least one opening or at least one indentation, and the at least one opening or the at least one indentation is elongated and extends parallel to an edge of the plate section.
- The object of the invention also is achieved by a prosthetic part having an anchorage section that is introducable into a bone recess, said anchorage section comprising at least partially a cage structure; a plate section that extends in a lateral direction beyond the anchorage section; and a supporting section for a joint part. The plate section is provided with at least one opening or at least one indentation in the vicinity of the edges of the plate section through which a severing instrument is introducable to cut a connection between the anchoring section and corticalis substance of a bone. The at least one opening or that at least one indentation is elongated and extends parallel to an edge of the plate section.
- The plate section comprises a marginal region having a circumferential arrangement of indentations.
- That the circumferential arrangement of indentations comprises a succession of indentations of differing depths.
- In the case of the prosthetic part according to the invention, passages are present or can easily be created by removing webs of material located beneath indentations or by drilling the supporting plate free, through which passages a chisel or a slender milling cutter can be guided. In this way a slit can be produced in the section of the spongy substance adjacent to the cortical substance, as a result of which the cohesion between the spongy substance that has grown into the cage structure and the cortical substance is weakened. The bridges of spongy substance leading to the cortical substance that cannot be removed by the chisel or by the milling cutter can then be broken up by mechanical loading of the prosthetic part (e.g., impact and/or twisting, with application of considerable force). After this, the prosthetic part can be taken out of the bone.
- Further features of the invention are specified in the specification.
- The volume of spongy substance that has grown in is inseparable from the cortical substance of the bone on the two principal surfaces. A further development of the invention permits an incision to be produced in the volume of spongy substance, which may extend practically over the entire surface of contact with the cortical substance. In this way it is possible for the prosthetic part to be removed in a straightforward manner.
- A further feature of the invention is with regard to particularly rapid opening of the depression, whereby a secure and load-bearing connection of the edge of the plate section to the interior of the plate section is guaranteed by virtue of the depressions having only slight depth. In the depressions having only slight depth the web of material can be removed by means of a milling cutter, whereby the walls of the depression may serve as a guide for the milling cutter.
- A further feature of the invention permits the setting angle of the chisel or milling cutter, which is introduced into an opening or into an opened depression to be varied.
- In the case of a prosthetic part according to the invention a drill for drilling free the points of attachment of the anchorage pillars pertaining to the cage structure can be simply and precisely aligned with the axis of an anchorage pillar.
- The invention is elucidated in more detail below on the basis of embodiments with reference to the drawings. Shown in the latter are:
- FIG. 1: a lateral view of a prosthetic part for an artificial hip joint;
- FIG. 2: a view of the right side of the prosthetic part shown in FIG. 1;
- FIG. 3: a transverse section through a depression which is provided in a near-edge region of a plate section of a modified prosthetic part;
- FIG. 4: a longitudinal section through the depression provided in a near-edge region of a plate section of the modified prosthetic part according to FIG. 3;
- FIG. 5: a similar view to FIG. 4 but wherein a depression having little depth is reproduced;
- FIG. 6: a top view of the plate section of a further modified prosthetic part which is provided in the marginal region of the plate section with a succession of depressions of differing depths; and
- FIG. 7: a view similar to FIG. 1, wherein a further modified prosthetic part is shown.
- Designated overall by10 in FIG. 1 is a prosthetic part which serves for implantation into the upper end of a
thighbone 12 indicated by a dashed line. To this end the upper section of thethighbone 12 which bears the condyle is resected and arecess 14 corresponding to the clear outer contour of theprosthetic part 10 is produced in the thighbone. - The
prosthetic part 10 has supportingplate 16 which comprises ahorizontal plate section 18 and aplate section 20 ascending obliquely upwards to the trochanter major. Molded onto theplate section 18 is atrunnion 22 ascending obliquely upwards, onto which acondyle 24 indicated by a dashed line is capable of being mounted. - Cast onto the underside of the supporting
plate 16 is a cage structure which is designated overall by 26. This cage structure consists of four curvedlongitudinal anchorage pillars plate section 18 there emanate two curvedadditional anchorage pillars 36, 38, the configuration of which is adapted to the trochanter major of the thighbone (femur) and which have a smaller spacing from one another than theadjacent anchorage pillars - In the interior of the clear contour of the
cage structure 26 predetermined by the anchorage pillars 28-38 additional stiffening pillars are provided which extend in oblique directions between the anchorage pillars 28-38. Three suchstiffening pillars - The anchorage pillars and the stiffening pillars each have a
cylindrical core 46 with axially spacedanchorage collars 48. - The
cores 46 of the anchorage pillars typically have a diameter of 2.0-4.5 mm, the diameters of the anchorage collars are each about 0.8-1.5 mm larger than the diameter of the cores. The axial extent of the anchorage collars amounts to about 0.6-1.2 mm, their spacing from one another amounts to about 3-6 mm. - For the stiffening pillars the cores may have a diameter of about 1.5-3.0 mm, the diameters of the anchorage collars may be about 0.6-1.2 mm larger that the core diameter, and the axial dimension of the anchorage collars may amount to about 0.5-1.0 mm, their axial spacing to about 2.0-4.0 mm.
- Cast onto the lower end of the
cage structure 26 is ashaft section 50. The latter has an olive-shaped end section 52. Adrill hole 54 extends through the interior of theshaft section 50. - With a view to implanting the prosthetic part described above, the end of the thighbone is resected as described above, the upper edge of the cortical substance being given a contour corresponding to the marginal contour of the supporting
plate 16. The bone material removed from the end of the bone in the course of preparation of therecess 14 is ground in a bone mill and poured into thecage structure 26. The outer surface of theshaft section 50 is coated with a cement. Theprosthetic part 10 is then inserted into the end of thethighbone 12, so that the supportingplate 16 now forms a new upper termination for the bone. Theprosthetic part 10 is then temporarily fixed with wire. - After the cement has hardened, the
prosthetic part 10 is connected to the upper end of the thighbone in partially loadable manner. In the further healing process the ground spongy substance coalesces and fills out the cage structure, at the same time growing up against the cortical substance and residues of spongy substance that have remained on the cortical substance. - Alternatively, the
shaft section 50 may not be coated with cement, a possibility which is advantageous with regard to easier later removal of the prosthetic part. - After the healing process has been concluded an adhesive connection consequently exists between the outer surface of the
shaft section 50 and the cortical substance of the thighbone, whereas in the region of thecage structure 26 there is an uninterrupted volume of spongy substance which has grown around thecage structure 26. - After the spongy substance has brown into the cage structure26 a very firm loadable connection exists between the thighbone and the prosthetic part. If for some reason the prosthetic part should have to be removed from the thighbone at any time, this would probable necessitate removing a part of the cortical substance surrounding the
cage structure 26 and chiseling thecage structure 26 free again with a chisel through the window that has been created this way. This would considerably restrict the options for a replacement by means of a prosthetic part that has to be cemented in. - In order to enable the
cage structure 26 to be chiseled free without producing a window in the spongy substance, in the prosthetic part shown in FIGS. 1 and 2elongated openings plate 16. A thin, slender chisel can be guided through said openings after theprosthetic part 10 has healed in, in order in each case to chisel free one of the two principal surfaces of thecage structure 26. After such an operation to chisel thecage structure 26 free, bridges of spongy substance remain, via which the cage structure remains connected to the cortical substance in the vicinity of the upper comers of the supportingplate 16 and on the narrow sides of the cage structure. These remaining bridges can be broken open by rotating theprosthetic part 10 about the axis of therecess 14 and/or by inflicting severs blows on the supportingplate 16. - If it is desired that the supporting
plate 16 normally seals the upper end of thethighbone 12 completely but that access to the two principal surfaces of thecage structure 26 should nevertheless be possible, instead of openings it is possible, according to FIGS. 3 and 4, to work withindentations 64 in the supportingplate 16 which, seen in top view, have the same geometry as theopenings indentations 64 have athin bottom wall 66, which has the desired barrier effect, but on the other hand they can easily be mechanically destroyed by the chisel which serves to chisel thecage structure 26 free. - As is evident from FIG. 3, the lateral walls of the
indentations 64 or of the openings that are later created from said indentations or of openings that are present from the very beginning are convex, as represented at 68. This permits the chisel or milling cutter which is used for chiseling thecage structure 26 free to be inclined also in the perpendicular direction relative to the longitudinal direction of the indentation or opening. - In a further modification, according to FIG. 5 use may be made of such indentations in which the
bottom wall 66 makes up an appreciable part of the thickness of the supportingplate 16, so that theindentations 64 do not have a negative influence on the mechanical strength of the marginal region of the supportingplate 16, so that theindentations 64 do not have a negative influence on the mechanical strength of the marginal region of the supportingplate 16. This design of theindentations 64 permits severalsuch indentations 64 permits several such indentations to be distributed along the edge of the supportingplate 16, as a result of which a larger part of the interface betweencage structure 26 and cortical substance of thethighbone 12 is made accessible. With such a design of theindentations 64 removal of thebottom wall 66 is effected by means of a milling cutter of suitable width, said milling cutter being guided by the walls of theindentation 64 parallel to the edge of the supportingplate 16. - In a further modification of the invention, according to FIG. 6 an arrangement of
indentations 64 a and 64 b may be provided on the upper side of the supportingplate 16 continuously following the edge, thebottom walls plate 16 by the walls of the indentations, but under usage conditions a very loadable connection formed by thebottom walls 66 b arms exists between the edge of the supportingplate 16 and the principal section thereof. - In the case of the
prosthetic part 10 according to FIG. 7 all the base-points of anchorage pillars which emanate from the supportingplate 16 are marked by aconical marker 70 on the upper side of the supportingplate 16. These markers serve at the same time as centering holes for the point of a drill with which the material pertaining to the supporting plate located above these anchorage pillars can be drilled away. Once this has been done for all the anchorage pillars the supportingplate 16 comes free from the cage structure (thin webs of material possibly left standing can be broken in the course of drilling by progress of the drill), so that said cage structure can be simply chiseled or milled out of therecess 14.
Claims (6)
1. A prosthetic part comprising:
a plate section (16) having a substantially rectangular marginal contour seen from above,
wherein two longitudinal edges of the plate section (18) are each provided with at least one opening (60, 62) or at least one indentation (64), and the at least one opening (60, 62) or the at least one indentation (64) is elongated and extends parallel to an edge of the plate section.
2. A prosthetic part comprising:
an anchorage section (26, 50) that is introducable into a bone recess (14), the anchorage section (26, 50) comprising at least partially a cage structure (26), a plate section (16) that extends in a lateral direction beyond the anchorage section (26, 50), and
a supporting section (22) for a joint part (24),
wherein the plate section (16) is provided with at least one opening (60, 62) or at least one indentation (64), through which a severing instrument is introducable to cut a connection between the anchoring section and corticalis substance of a bone, and wherein the plate section (16) comprises a marginal region having a circumferential arrangement of indentations (64 a, 64 b), and
wherein the at least one opening (60, 62) or the at least one indentation (64) is elongated and extends parallel to an edge of the plate section.
3. The prosthetic part as set forth in , wherein the circumferential arrangement of indentations (64 a, 64 b) comprises a succession of indentations (64 a, 64 b) of differing depths.
claim 2
4. The prosthetic part as set forth in , wherein the at least one opening (60, 62) or the at least one indentation (64) is convex.
claim 1
5. A prosthetic part comprising:
an anchorage section (26, 50) that is introducable into a bone recess (14), said anchorage section comprising at least partially a cage structure (26),
a plate section (16) that extends in a lateral direction beyond the anchorage section (26, 50), and
a supporting section (22) for a joint part (24),
wherein the plate section (16) is provided with at least one opening (60, 62) or at least one indentation (64) in the vicinity of the edges of the plate section, through which a severing instrument in introducable to cut a connection between the anchoring section and corticalis substance of a bone,
wherein the plate section (16) comprises a marginal region having a circumferential arrangement of indentations (64 a, 64 b),
wherein the at least one opening (60, 62) or the at least one indentation (64) is elongated and extends parallel to an edge of the plate section, and
wherein the circumferential arrangement of indentations (64 a, 64 b) comprises a succession of indentations (64 a, 64 b) of differing depths.
6. The prosthetic part as set forth in , wherein the at least one opening (60, 62) or the at least one indentation (64) is convex.
claim 5
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/853,855 US20010018617A1 (en) | 1996-04-02 | 2001-05-10 | Prosthetic part |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19613078.6 | 1996-04-02 | ||
DE19613078A DE19613078A1 (en) | 1996-04-02 | 1996-04-02 | Prosthesis part |
US09/155,837 US6287342B1 (en) | 1996-04-02 | 1997-04-02 | Prosthesis part |
US09/853,855 US20010018617A1 (en) | 1996-04-02 | 2001-05-10 | Prosthetic part |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/155,837 Division US6287342B1 (en) | 1996-04-02 | 1997-04-02 | Prosthesis part |
Publications (1)
Publication Number | Publication Date |
---|---|
US20010018617A1 true US20010018617A1 (en) | 2001-08-30 |
Family
ID=7790207
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/155,837 Expired - Fee Related US6287342B1 (en) | 1996-04-02 | 1997-04-02 | Prosthesis part |
US09/853,855 Abandoned US20010018617A1 (en) | 1996-04-02 | 2001-05-10 | Prosthetic part |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US09/155,837 Expired - Fee Related US6287342B1 (en) | 1996-04-02 | 1997-04-02 | Prosthesis part |
Country Status (4)
Country | Link |
---|---|
US (2) | US6287342B1 (en) |
EP (1) | EP0891167A1 (en) |
DE (1) | DE19613078A1 (en) |
WO (1) | WO1997036559A1 (en) |
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US10835318B2 (en) | 2016-08-25 | 2020-11-17 | DePuy Synthes Products, Inc. | Orthopedic fixation control and manipulation |
US20210045882A1 (en) * | 2018-11-06 | 2021-02-18 | Hongwen Zhu | Bionic artificial hip joint |
US10932857B2 (en) * | 2010-05-19 | 2021-03-02 | DePuy Synthes Products, Inc. | Orthopedic fixation with imagery analysis |
US11304757B2 (en) | 2019-03-28 | 2022-04-19 | Synthes Gmbh | Orthopedic fixation control and visualization |
US11334997B2 (en) | 2020-04-03 | 2022-05-17 | Synthes Gmbh | Hinge detection for orthopedic fixation |
US11439436B2 (en) | 2019-03-18 | 2022-09-13 | Synthes Gmbh | Orthopedic fixation strut swapping |
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DE19907489C1 (en) * | 1999-02-16 | 2000-11-16 | Eska Implants Gmbh & Co | Hollow endoprosthesis |
DE10007577C1 (en) * | 2000-02-18 | 2001-09-13 | Infineon Technologies Ag | Piezo resonator has piezo layer between first and second electrode layers, third electrode layer and electroactive or electrostrictive layer between third and second electrode layers |
DE10037345A1 (en) * | 2000-07-29 | 2002-02-07 | Juergen Buchholz | Surgical element |
DE20120241U1 (en) | 2001-12-14 | 2003-04-24 | Keramed Medizintechnik Gmbh | Endoprosthesis |
US8998919B2 (en) | 2003-06-25 | 2015-04-07 | DePuy Synthes Products, LLC | Assembly tool for modular implants, kit and associated method |
US7297166B2 (en) | 2003-06-25 | 2007-11-20 | Depuy Products, Inc. | Assembly tool for modular implants and associated method |
US7582092B2 (en) | 2003-06-25 | 2009-09-01 | Depuy Products, Inc. | Assembly tool for modular implants and associated method |
US7074224B2 (en) | 2003-06-25 | 2006-07-11 | Depuy Products, Inc. | Modular tapered reamer for bone preparation and associated method |
US7785328B2 (en) | 2003-12-30 | 2010-08-31 | Depuy Products, Inc. | Minimally invasive bone miller apparatus |
US8597298B2 (en) | 2006-09-29 | 2013-12-03 | DePuy Synthes Products, LLC | Proximal reamer |
US8556912B2 (en) | 2007-10-30 | 2013-10-15 | DePuy Synthes Products, LLC | Taper disengagement tool |
US8518050B2 (en) | 2007-10-31 | 2013-08-27 | DePuy Synthes Products, LLC | Modular taper assembly device |
DE102008014466A1 (en) * | 2008-03-17 | 2009-09-24 | Franz Prof. Dr. med. Copf sen. | Prosthesis body for a thigh prosthesis |
US8167882B2 (en) | 2008-09-30 | 2012-05-01 | Depuy Products, Inc. | Minimally invasive bone miller apparatus |
US8533921B2 (en) | 2010-06-15 | 2013-09-17 | DePuy Synthes Products, LLC | Spiral assembly tool |
US9095452B2 (en) | 2010-09-01 | 2015-08-04 | DePuy Synthes Products, Inc. | Disassembly tool |
EP2856976A1 (en) | 2011-04-06 | 2015-04-08 | DePuy Synthes Products, LLC | Instrument assembly for implanting a revision hip prosthesis |
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US4888022A (en) * | 1985-12-30 | 1989-12-19 | Huebsch Donald L | Endoprosthesis |
US5092899A (en) * | 1988-03-21 | 1992-03-03 | Mark Forte | Prosthesis with flexible intramedullary stem |
DE3707518A1 (en) * | 1986-05-16 | 1987-11-26 | Copf Franz | PROSTHESE PART AND METHOD FOR THE PRODUCTION THEREOF |
US4770660A (en) * | 1987-01-20 | 1988-09-13 | Osteonics Corp. | Femoral prosthesis with selectively removable collar |
DE3714966A1 (en) * | 1987-05-01 | 1988-11-10 | Mecron Med Prod Gmbh | DEVICE FOR MEASURING THE POWERFUL CONNECTION OF A CEMENT-FREE IMPLANTABLE IMPLANTABLE PROSTHESIS WITH A BONE SHAFT |
DE3715000A1 (en) * | 1987-05-06 | 1988-11-17 | Krupp Gmbh | JOINT PROSTHESIS AND METHOD FOR THEIR PRODUCTION |
US4904268A (en) * | 1988-09-12 | 1990-02-27 | Alfredo Alvarado | Prosthetic device |
US5002578A (en) * | 1990-05-04 | 1991-03-26 | Venus Corporation | Modular hip stem prosthesis apparatus and method |
US5163964A (en) * | 1991-06-26 | 1992-11-17 | Zimmer, Inc. | Orthopaedic prosthesis with access in collar |
DE9403263U1 (en) * | 1994-02-26 | 1994-04-21 | Aesculap Ag | Shaft endoprosthesis |
-
1996
- 1996-04-02 DE DE19613078A patent/DE19613078A1/en not_active Withdrawn
-
1997
- 1997-04-02 US US09/155,837 patent/US6287342B1/en not_active Expired - Fee Related
- 1997-04-02 EP EP97916423A patent/EP0891167A1/en not_active Withdrawn
- 1997-04-02 WO PCT/EP1997/001647 patent/WO1997036559A1/en not_active Application Discontinuation
-
2001
- 2001-05-10 US US09/853,855 patent/US20010018617A1/en not_active Abandoned
Cited By (12)
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US10932857B2 (en) * | 2010-05-19 | 2021-03-02 | DePuy Synthes Products, Inc. | Orthopedic fixation with imagery analysis |
US20210153944A1 (en) * | 2010-05-19 | 2021-05-27 | DePuy Synthes Products, Inc. | Orthopedic Fixation With Imagery Analysis |
US11896313B2 (en) * | 2010-05-19 | 2024-02-13 | DePuy Synthes Products, Inc. | Orthopedic fixation with imagery analysis |
US10835318B2 (en) | 2016-08-25 | 2020-11-17 | DePuy Synthes Products, Inc. | Orthopedic fixation control and manipulation |
US11918292B2 (en) | 2016-08-25 | 2024-03-05 | DePuy Synthes Products, Inc. | Orthopedic fixation control and manipulation |
US20210045882A1 (en) * | 2018-11-06 | 2021-02-18 | Hongwen Zhu | Bionic artificial hip joint |
US11413153B2 (en) * | 2018-11-06 | 2022-08-16 | Hongwen Zhu | Bionic artificial hip joint |
US11439436B2 (en) | 2019-03-18 | 2022-09-13 | Synthes Gmbh | Orthopedic fixation strut swapping |
US11648035B2 (en) | 2019-03-18 | 2023-05-16 | Synthes Gmbh | Orthopedic fixation strut swapping |
US11304757B2 (en) | 2019-03-28 | 2022-04-19 | Synthes Gmbh | Orthopedic fixation control and visualization |
US11334997B2 (en) | 2020-04-03 | 2022-05-17 | Synthes Gmbh | Hinge detection for orthopedic fixation |
US11893737B2 (en) | 2020-04-03 | 2024-02-06 | Synthes Gmbh | Hinge detection for orthopedic fixation |
Also Published As
Publication number | Publication date |
---|---|
DE19613078A1 (en) | 1997-10-09 |
US6287342B1 (en) | 2001-09-11 |
WO1997036559A1 (en) | 1997-10-09 |
EP0891167A1 (en) | 1999-01-20 |
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Legal Events
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