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WO1999012498A1 - Element prothetique - Google Patents

Element prothetique Download PDF

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Publication number
WO1999012498A1
WO1999012498A1 PCT/EP1997/004824 EP9704824W WO9912498A1 WO 1999012498 A1 WO1999012498 A1 WO 1999012498A1 EP 9704824 W EP9704824 W EP 9704824W WO 9912498 A1 WO9912498 A1 WO 9912498A1
Authority
WO
WIPO (PCT)
Prior art keywords
prosthesis
anchoring
cage
part according
segments
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.)
Ceased
Application number
PCT/EP1997/004824
Other languages
German (de)
English (en)
Inventor
Franz Copf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE19635307A priority Critical patent/DE19635307A1/de
Application filed by Individual filed Critical Individual
Priority to EP97941981A priority patent/EP1027018A1/fr
Priority to PCT/EP1997/004824 priority patent/WO1999012498A1/fr
Publication of WO1999012498A1 publication Critical patent/WO1999012498A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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    • A61F2/36—Femoral heads ; Femoral endoprostheses
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    • A61F2/367—Proximal or metaphyseal 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
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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    • A61F2002/30317—The prosthesis having different structural features at different locations within the same prosthesis
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    • 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

Definitions

  • the invention relates to a prosthesis part according to the preamble of claim 1.
  • cancellous bone grows between the anchoring pillars of the anchoring cage, as a result of which the prosthetic part is dynamically and firmly connected to the end of the femur.
  • the present invention is intended to develop a prosthesis part in accordance with the preamble of claim 1 in such a way that it implants the advantages without cement
  • Prosthesis parts with an open anchoring cage which offers a variety of anchoring surfaces, but is cheaper to manufacture.
  • anchoring cages can also be manufactured inexpensively in small series.
  • the malleable metals from which the prosthetic part according to the invention according to, are also characterized by good strength and toughness, as is desired for prosthetic parts.
  • the metal is also given a favorable structure by forging.
  • a prosthesis part as specified in claim 2, has on the one hand an open structure which is particularly favorable for the ingrowth of cancellous bone, but can still be produced inexpensively, the contour of the anchoring pillars partly by forging in the die and partly by machining is generated. Machining can be carried out inexpensively on numerically controlled machine tools despite the relatively complicated contour of the anchoring cage, the latter being controlled on the basis of the drawing data for the anchoring cage.
  • the cage segments can also be connected by welding, as specified in claim 7.
  • an anchoring cage is obtained in a very simple manner with a simple geometry of the plate-shaped cage segments.
  • the development of the invention according to claim 10 is advantageous with regard to simple geometry of the prosthesis segments with a large anchoring area and provision of a large number of anchoring shoulders.
  • the prosthesis part is made up entirely of plate-shaped cage segments, overall there are particularly favorable production costs with a well-open anchoring cage.
  • the production of the prosthesis part from titanium or a titanium alloy according to claim 15 is with regard to high mechanical resilience and good biocompatibility of the prosthesis part are an advantage.
  • FIG. 1 a lateral, ventral view of a prosthesis part for an artificial hip joint
  • FIG. 2 a top view of the right, medial side of the prosthesis part shown in FIG. 1, with a support pin being shown in axial section;
  • FIGS. 1 and 2 shows a lateral, ventral view of a central prosthesis segment of the prosthesis according to FIGS. 1 and 2;
  • FIG. 4 an axial top view of a modified anchoring pillar for the prosthesis segment according to FIG. 3;
  • FIG. 5 a top view of a modified middle prosthesis segment which can be used instead of the prosthesis segment according to FIG. 3;
  • FIG. 6 a section along the section line VI-VI from FIG. 5;
  • FIG. 7 a lateral, ventral view of a further central prosthesis segment which can be used in the prosthesis part according to FIGS. 1 and 2;
  • Figure 8 an enlarged partial section through the thesis segment according to Figure 7 along the section line VIII - VIII there;
  • FIG. 9 a ventral view of a further middle prosthesis segment which can be used in the prosthesis part according to FIGS. 1 and 2;
  • FIG. 10 an enlarged partial section through the prosthesis segment of Figure 9 along the section line X - X;
  • FIG. 11 a ventral view of a prosthesis blank for a further modified prosthesis part
  • FIG. 12 a section along the section line XII-XII from FIG. 11;
  • Figure 13 a section perpendicular to the central plane through another prosthetic part.
  • a prosthesis part which serves for implantation in the upper end of a femur 12 indicated by dashed lines, is designated overall by 10 in FIG.
  • the upper section of the femur 12 carrying the joint ball is resected and a recess 14 is created in the femur, which corresponds to the clear outer contour of the prosthesis part 10.
  • the prosthesis part 12 has a support plate 16 which has a horizontal plate section 18 and a plate section 20 which rises obliquely upwards towards the minor trochanter.
  • a support pin 22, which rises obliquely upwards, is formed on the plate section 18, onto which a joint ball 24, indicated by dashed lines, can be placed.
  • An anchoring cage, designated overall by 26, is cast onto the underside of the support plate 16.
  • This cage structure consists of four curved longitudinal anchoring posts 28, 30, 32, 34, which essentially define the shape of a curved pyramid with a rectangular cross section at the top and an increasingly round cross section at the bottom.
  • Two curved additional anchoring posts 36, 38 extend from the upper end of the plate section 18, the shape of which is adapted to the greater trochanter of the femur and which are at a smaller distance from one another than the adjacent anchoring posts 32 and 34.
  • anchoring posts 28-38 In the interior of the clear contour of the anchoring cage 26 predetermined by the anchoring posts 28-38, further anchoring posts are provided which run in oblique directions between the anchoring posts 28-38. Of these, three such anchoring pillars 40, 42, 44 that also stiffen the anchoring cage 26 are shown.
  • the anchoring pillars each have a cylindrical core 46 with a large number of axially spaced anchoring collars 48.
  • the cores 46 of the anchoring posts 28 to 34 have a diameter of 2.0-4.5 mm, the diameters of the anchoring collars are each approximately 0.8-1.5 mm larger than the diameter of the cores.
  • Extension of the anchoring collars is approximately 0.6-1.2 mm, their distance from each other approximately 3-6 mm.
  • the cores can have a diameter of approximately 1.5-3 for the stiffening inner anchoring pillars 40, 42, 44 mm, the diameter of the anchoring collars is approximately 0.6-1.2 mm larger than the core diameter, and the axial dimension of the anchoring collars can be approximately 0.5-1 mm, their axial spacing approximately 2-4 mm.
  • a shaft section 50 is molded onto the lower end of the anchoring cage 26. This has an olive-shaped end section 52.
  • a channel 54 extends through the interior of the shaft section 50.
  • the end of the thigh bone is resected as described above, the upper edge of the cortical being receiving a contour corresponding to the edge contour of the support plate 16.
  • the bone material removed from the bone end during the production of the recess 14 is ground in a bone mill and filled into the anchoring cage 26.
  • the prosthesis part 10 is then inserted into the proximal end of the femur 12, so that the support plate 16 now forms a new upper end for the bone.
  • the prosthesis part 10 After insertion of the prosthesis part 10, it is connected to the upper end of the femur in a partially load-bearing manner. In the further healing process, the ground cancellous bone grows together and fills the cage structure, while growing up against the corticalis and the remaining cancellous bone remains.
  • the prosthesis part 10 consists of three prosthesis segments: one in FIG 2 prosthesis segment 10A on the left comprises the anchoring posts 28, 30 and adjacent anchoring posts, which lie in the area predetermined by the anchoring posts 28, 30 or run parallel to the latter. Furthermore, the prosthesis segment 10A includes a segment 16A of the support plate 16, a segment 50A of the shaft section 50, an upper pin segment 60A, and a pin segment 62A located below.
  • a central prosthesis segment 10B comprises those anchoring pillars which run in or adjacent to a central plane of the prosthesis part 10, a segment 16B of the support plate 16, a segment 50B of the shaft section 50, an upper pin segment 60B and a lower pin segment 62B.
  • a slot in the segment 50B of the shaft section 50B forms the channel 54 together with slot-free shaft sections 50A and 50C of the prosthesis segments 10A and IOC.
  • a prosthesis segment IOC located on the right in FIG. 2 comprises the anchoring pillars 32, 34 and further anchoring pillars which run in the area predetermined by the anchoring pillars 32, 34 or are adjacent to it, a segment 16C of the supporting plate
  • top pin segments 60A, 60B, 60C taken together form an inner pin, onto which the support pin 22, which is designed as a cup-shaped part, is shrunk in the hot state.
  • the underlying pin segments 62A, 62B and 62C together form an inner pin on which an end piece 64 is shrunk in the hot state.
  • the individual prosthesis segments are free of undercuts and can be forged in a two-part die shape. Any burrs remaining after drop forging are removed by machining.
  • FIG. 3 shows a modified middle prosthesis segment 10B:
  • a downwardly extending wall 66 is formed on the segment 16B of the support plate 16, the edge contour of which is selected in accordance with the clear outer contour of the prosthesis part 10.
  • Anchoring pillars 68 are formed on the wall 66, perpendicular to the wall plane, which in turn have a core 70 and axially successive anchoring collars 72 carried by it. A plurality of through openings 74 are also provided in the wall.
  • the anchoring posts 68 are made from pillar blanks by machining, which are attached to the wall 66 when the prosthesis segment 10B is forged. were formed. Except for a small remaining web, the passage openings 74 are also made by drop forging, the opening walls having a substantially semicircular cross section. The webs remaining in drop forging are cut out with a tool.
  • the prosthesis segment 10B can also be inexpensively manufactured in a two-part die shape; machining can be carried out inexpensively and quickly.
  • the anchoring surfaces working together with the cancellous bone can be provided in the form of anchoring channels instead of in the form of anchoring bundles, as shown in FIG. 4. These anchoring surfaces lie in the forging direction and can thus also be produced when the prosthesis segment 10B is forged.
  • the anchoring ribs 76 are arranged like a net or truss and not only increase the contact area with cancellous bone that is to be illuminated, but also stiffen the wall 66.
  • anchoring ribs 76 which carry successive anchoring collars 79 in the longitudinal direction of the ribs, which are similarly dimensioned as the main anchoring pillars 38 to 34, are forged onto a wall 66 hanging from the support plate segment 16B in the direction of the main stress lines.
  • the height (extension perpendicular to the plane of the drawing) of the anchoring ribs 76 is again chosen as is desired in view of filling the space spanned by the anchoring pillars 28 to 32 with anchoring surfaces.
  • the anchoring ribs 76 can again be provided with through openings (corresponding to the through openings 77 of FIG. 6).
  • the prosthesis segment 10B according to FIGS. 9 and 10 is very similar to that according to FIGS. 7 and 8, only the wall 66 is omitted and the shaft section segment 50B is connected to the support plate segment 16B via three of the anchoring ribs 76, which now extend on both sides of the central surface of the prosthesis segment 10B . In this way, the anchoring cage of the prosthesis part obtained with the prosthesis segment 10B according to FIGS. 9 and 10 is even more open.
  • Prosthesis part 10 also start from a one-piece blank, which is already provided with all desired surface contours of the anchoring pillars during die forging, insofar as these can be produced in the pressing direction.
  • This blank is similar to the prosthesis part 10B according to FIGS. 7 and 8, with the proviso that under the anchoring ribs 76 there are marginal ones which span the same space as the anchoring pillars 28 to 34, so that the anchoring ribs are overall higher.
  • the marginal anchoring ribs 76 are machined:
  • the material volumes 78 lying behind them are partially removed under NC-controlled machining (upper left-hand section of FIG. 12), as a result of which the inner surface of the anchoring pillars 28 to 32 and the surfaces of any further anchoring pillars lying between them and the median plane of the prosthesis part are generated .
  • the side anchoring ribs can also be provided with a row of through openings 81 which follow one another in the longitudinal direction of the ribs, in which case through holes 83 are produced simultaneously in the central anchoring ribs 76, as shown in the lower right section of FIG. 12.
  • the anchoring cage 26 is formed by a multiplicity of anchoring plates 80, 82, 84, 86.
  • the anchoring plates 80, 82, 84, 86 are alternately provided with indentations 88 from one and the other side, the whole in such a way that a two-dimensional corrugation of the plates is obtained.
  • through openings 90 are provided in the anchoring plates, which, as shown at 92, have a semicircular cross-sectional edge wall.
  • the through openings 92 have a diameter of approximately 3 to approximately 8 mm, preferably approximately 5 mm.
  • the through openings 90 of adjacent cage segments 80, 82, 84, 86 are offset from one another.
  • the upper retaining strips 94-100 are accommodated in the interior of a recess 110 which is provided in the support plate 16, which is now thicker.
  • the support plate 16 is shrunk onto the holding strips 94, 96, 98, 100 in the hot state.
  • the holding strips 94 to 108 can in turn be provided with positive locking elements, not shown, on the one hand to facilitate their alignment, and on the other hand to avoid shifting the retaining strips against each other.
  • the outer ones of the retaining strips can be provided with side surfaces which are inclined downwards and inwards, the side surfaces of the recess 110 which cooperate with these being correspondingly inclined. In this way, an even more secure connection of the holding strips to the support plate 16 is ensured after it has been shrunk on.
  • an olive-shaped end body 116 is shrunk hot analogously onto the lower holding strips 102, 104, 106, 108.
  • edge contour of the individual anchoring plates 80, 82, 84, 86 is selected to be similar to that of the prosthesis segments 10B and the anchoring plates have been given such a macro curvature during die forging that the overall desired desired outer contour of the anchoring cage 26 is obtained.
  • the anchoring plates 80, 82, 84, 86 are manufactured in such a way that flat blanks including the upper and lower holding strips are first produced, with the through-holes 90 already being produced with the appropriate drop forging, except for a small, permanent middle bar. Then these small bars are cut out and the impressions are made in one or more further forging steps
  • the retaining strips can be used to strengthen the connection 94 to 100 can be connected to one another by welds 118 and to the support plate 16 by welds 120.
  • a similar procedure can be used for the lower holding strips 102 to 108, although not shown in the drawing.

Landscapes

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

Abstract

L'invention concerne un élément prothétique (10) comportant un logement d'ancrage (26) permettant la croissance de la substance osseuse. Cet élément prothétique se présente sous la forme d'une pièce forgée composée d'une pluralité de segments de prothèse (10A, 10B, 10C) pouvant être forgés respectivement avec un outil de façonnage en deux parties.
PCT/EP1997/004824 1996-09-01 1997-09-05 Element prothetique Ceased WO1999012498A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19635307A DE19635307A1 (de) 1996-09-01 1996-09-01 Prothesenteil
EP97941981A EP1027018A1 (fr) 1997-09-05 1997-09-05 Element prothetique
PCT/EP1997/004824 WO1999012498A1 (fr) 1996-09-01 1997-09-05 Element prothetique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19635307A DE19635307A1 (de) 1996-09-01 1996-09-01 Prothesenteil
PCT/EP1997/004824 WO1999012498A1 (fr) 1996-09-01 1997-09-05 Element prothetique

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WO1999012498A1 true WO1999012498A1 (fr) 1999-03-18

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PCT/EP1997/004824 Ceased WO1999012498A1 (fr) 1996-09-01 1997-09-05 Element prothetique

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WO (1) WO1999012498A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19635307A1 (de) * 1996-09-01 1998-03-05 Copf Franz Prof Dr Med Prothesenteil
JP4266543B2 (ja) * 2000-10-30 2009-05-20 ツィマー ゲーエムベーハー 近位心出し装置を備える人工大腿骨幹
EP1260200B1 (fr) * 2001-05-18 2007-03-28 Copf, Peter, Dr. med Endoprothèse non cimentée de l'articulation de la hanche pour remplacer la surface de la partie proximale du fémur
ITPI20020002A1 (it) * 2002-01-04 2003-07-04 Pierluigi Versari Stelo stabilizzato per protesi
DE102007031663A1 (de) * 2006-08-04 2008-02-21 Ceramtec Ag Innovative Ceramic Engineering Asymmetrische Gestaltung von Prothesenkomponenten zur Manipulation und Unterdrükung der Eigenfrequenzen

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0040884A1 (fr) * 1980-05-23 1981-12-02 Jan Willem Smit Dispositif d'accouplement orthopédique
DE3445738A1 (de) * 1984-12-14 1986-06-19 Draenert Klaus Implantat zur knochenverstaerkung und verankerung von knochenschrauben, implantaten oder implantatteilen
DE3707518A1 (de) 1986-05-16 1987-11-26 Copf Franz Prothesenteil sowie verfahren zu seiner herstellung
FR2610823A1 (fr) * 1987-02-12 1988-08-19 Cuilleron J Tige femorale perfectionnee pour protheses de hanches
EP0289922A1 (fr) * 1987-05-06 1988-11-09 Fried. Krupp Gesellschaft mit beschränkter Haftung Prothèse d'articulation et procédé pour sa fabrication
EP0311749A1 (fr) * 1987-09-17 1989-04-19 Howmedica GmbH Partie fémorale d'une endoprothèse pour l'articulation de la hanche
EP0375600A2 (fr) * 1988-12-23 1990-06-27 Johnson & Johnson Professional Products GmbH Méthode de formation d'une endoprothèse
WO1992000046A1 (fr) * 1990-06-24 1992-01-09 Howmedica Inc. Surface de fixation poreuse
EP0621018A1 (fr) * 1992-04-17 1994-10-26 Kyocera Corporation Prothèse et procédé pour la fabriquer
EP0721767A2 (fr) * 1995-01-11 1996-07-17 BIOMET Deutschland GmbH Endoprothèse
DE19635307A1 (de) * 1996-09-01 1998-03-05 Copf Franz Prof Dr Med Prothesenteil

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0040884A1 (fr) * 1980-05-23 1981-12-02 Jan Willem Smit Dispositif d'accouplement orthopédique
DE3445738A1 (de) * 1984-12-14 1986-06-19 Draenert Klaus Implantat zur knochenverstaerkung und verankerung von knochenschrauben, implantaten oder implantatteilen
DE3707518A1 (de) 1986-05-16 1987-11-26 Copf Franz Prothesenteil sowie verfahren zu seiner herstellung
FR2610823A1 (fr) * 1987-02-12 1988-08-19 Cuilleron J Tige femorale perfectionnee pour protheses de hanches
EP0289922A1 (fr) * 1987-05-06 1988-11-09 Fried. Krupp Gesellschaft mit beschränkter Haftung Prothèse d'articulation et procédé pour sa fabrication
EP0311749A1 (fr) * 1987-09-17 1989-04-19 Howmedica GmbH Partie fémorale d'une endoprothèse pour l'articulation de la hanche
EP0375600A2 (fr) * 1988-12-23 1990-06-27 Johnson & Johnson Professional Products GmbH Méthode de formation d'une endoprothèse
WO1992000046A1 (fr) * 1990-06-24 1992-01-09 Howmedica Inc. Surface de fixation poreuse
EP0621018A1 (fr) * 1992-04-17 1994-10-26 Kyocera Corporation Prothèse et procédé pour la fabriquer
EP0721767A2 (fr) * 1995-01-11 1996-07-17 BIOMET Deutschland GmbH Endoprothèse
DE19635307A1 (de) * 1996-09-01 1998-03-05 Copf Franz Prof Dr Med Prothesenteil

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