US20010016778A1 - Fixation of a ceramic structural member by way of gliding component in a femoral part - Google Patents

Fixation of a ceramic structural member by way of gliding component in a femoral part Download PDF

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Publication number
US20010016778A1
US20010016778A1 US09/774,716 US77471601A US2001016778A1 US 20010016778 A1 US20010016778 A1 US 20010016778A1 US 77471601 A US77471601 A US 77471601A US 2001016778 A1 US2001016778 A1 US 2001016778A1
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Prior art keywords
structural member
femoral part
ceramic structural
knee
femoral
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Abandoned
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US09/774,716
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Dirk Badorf
Hartmut Kalberer
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Individual
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Individual
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Priority claimed from DE19711628A external-priority patent/DE19711628A1/en
Application filed by Individual filed Critical Individual
Priority to US09/774,716 priority Critical patent/US20010016778A1/en
Publication of US20010016778A1 publication Critical patent/US20010016778A1/en
Priority to US10/209,936 priority patent/US20020187251A1/en
Abandoned legal-status Critical Current

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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30383—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by laterally inserting a protrusion, e.g. a rib into a complementarily-shaped groove
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    • A61F2002/30385—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by laterally inserting a protrusion, e.g. a rib into a complementarily-shaped groove the rib and groove having non-parallel, e.g. conically-tapered, cooperating sides, e.g. having a trapezoidal front cross-section
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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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    • A61F2002/30772—Apertures or holes, e.g. of circular cross section
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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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    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2220/0041—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels or rivets, e.g. connecting screws
    • A—HUMAN NECESSITIES
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    • A61F2220/0058—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements soldered or brazed or welded
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    • A61F2310/00011—Metals or alloys
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Definitions

  • the invention relates to a knee-joint endoprosthesis according to the preamble to claim 1 .
  • a knee-joint endoprosthesis having a metallic femoral part anchored in the femur that articulates with a tibial part made of polyethylene which is anchored in the tibia bone.
  • the articulating surface of the femoral part is formed by a ceramic structural member that is connected to the femoral part in mechanically stable manner.
  • the object underlying the invention is to improve a knee-joint endoprosthesis according to the preamble to claim 1 in such a way that the attachment of the ceramic structural member to the femoral part is optimised.
  • the ceramic structural member is anchored on the femoral part by means of a conical clamping device.
  • a conical slot is expediently produced in the femoral part, into which slot the conical lateral surfaces of the structural member are inserted.
  • the angle of the conical clamping device preferably amounts to between 50 and 20°. The larger the angle, the more easily the structural members can be removed during a further operation, even after an implantation.
  • the conical clamping device is disposed only in the region above what is the loading zone the knee is extended.
  • the conical clamping device extends over the entire region of the articulating surface.
  • the structural member is anchored on the femoral part by means of at least one fixing screw.
  • a conical clamping device would be dispensed with in this case.
  • Use is preferably made of two structural members per endoprosthesis. However, use may also be made of only one structural member, which then has two articulating surfaces.
  • the ceramic structural member is connected to the femoral part in nondetachable manner by shrinking, soldering or welding. Soldering also includes active soldering.
  • This attachment can be improved if the ceramic structural member is additionally connected to the femoral part by means of a congruent surface arrangement.
  • the latter may be constituted by, for example, interlocking slots and ribs.
  • the ceramic structural member is additionally connected to the femoral part by means of a slot/spring connection.
  • the latter is particularly expedient when there is shrinking on.
  • a rib on the structural member for example, projects into a slot in the femoral part, or vice versa.
  • many variants of the congruent surface arrangement are possible.
  • the ceramic structural member is in the form of a layer and is secured or applied by vapour deposition, spray application or such like.
  • the structural member is accordingly a layer in this case. of course, this layer may also consist of several individual layers.
  • a ceramic material for the layer or the other structural members would be, for example, aluminium oxide.
  • FIG. 1 a a cross-section through a femoral part with a structural member inserted with the aid of a conical clamping device
  • FIG. 1 b the same section as in FIG. 1 a , but rotated through 180°
  • FIG. 2 a lateral section through a femoral part with a structural member mounted with the aid of a conical clamping device, the conical clamping device being disposed only above the loading zone,
  • FIG. 3 the attachment of the structural member to the femoral part with the aid of a fixing screw
  • FIG. 4 the attachment of the structural member to the femoral part by shrinking
  • FIG. 4 a representing a section like FIG. 1 b and
  • FIG. 4 b representing a section like FIGS. 2, 3.
  • FIGS. 1 a and 1 b a metallic femoral part 2 is shown in various sections.
  • a slot 5 or two slots 5 are produced in the femoral part 2 in the region of the articulating surface. At their sides these slots 5 have conical surfaces with angles between 5° and 20°.
  • Ceramic structural members 3 which have corresponding conical lateral surfaces, so that a conical clamping device 4 is formed.
  • the structural members 3 are not shown articulating with a tibial part anchored in the tibia bone.
  • the slot 5 extends along the entire articulating surface.
  • several slots 5 or individual notches may also be provided so that the structural member 3 is anchored to the femoral part 2 only at individual points by means of a conical clamping device 4 .
  • FIG. 2 shows a lateral section through a femoral part 2 with, likewise, a structural member 3 that is mounted with the aid of a conical clamping device 4 .
  • the conical clamping device 4 in this case, as distinct from the embodiment of FIG. 1, is disposed only above what is the loading zone when the knee is extended. To this end a clamping surface that is not as large as that in FIG. 1 is produced in the femoral part 2 .
  • FIG. 3 shows the attachment of the ceramic structural member 3 to the femoral part 2 by means of a fixing screw 1 .
  • a bore 7 is disposed in the structural member 3 and a thread 6 is disposed in the femoral part 2 .
  • the fixing screw 1 projects through the bore 7 into the thread 6 and in this way anchors the structural member 3 to the femoral part 2 .
  • FIG. 4 shows a femoral part 2 that has a slot 10 on its tibial side.
  • the associated ceramic structural member 3 has a rib 11 that is congruent with the slot.
  • FIG. 4 a shows the femoral part 2 in cross-section and
  • FIG. 4 b shows it in longitudinal section.
  • the structural member 3 is attached by shrinking it on. But it may also be soldered on or welded on. In this case the slot/spring connection may optionally be dispensed with.

Abstract

The invention relates to a knee-joint endoprosthesis with a metallic femoral part (2) anchored in the femur that articulates with a tibial part anchored in the tibia bone, the articulating surface of the femoral part (2) being a ceramic structural member (3) that is connected to the femoral part (2) in mechanically stable manner.
With a view to optimising the attachment of the ceramic structural member (3) to the femoral part (2), various possible solutions are proposed.

Description

  • The invention relates to a knee-joint endoprosthesis according to the preamble to claim [0001] 1.
  • Known from WO 95/23567 is a knee-joint endoprosthesis having a metallic femoral part anchored in the femur that articulates with a tibial part made of polyethylene which is anchored in the tibia bone. The articulating surface of the femoral part is formed by a ceramic structural member that is connected to the femoral part in mechanically stable manner. [0002]
  • The object underlying the invention is to improve a knee-joint endoprosthesis according to the preamble to claim [0003] 1 in such a way that the attachment of the ceramic structural member to the femoral part is optimised.
  • In one embodiment according to the invention the ceramic structural member is anchored on the femoral part by means of a conical clamping device. To this end a conical slot is expediently produced in the femoral part, into which slot the conical lateral surfaces of the structural member are inserted. The angle of the conical clamping device preferably amounts to between 50 and 20°. The larger the angle, the more easily the structural members can be removed during a further operation, even after an implantation. [0004]
  • In a preferred embodiment the conical clamping device is disposed only in the region above what is the loading zone the knee is extended. [0005]
  • In another preferred embodiment the conical clamping device extends over the entire region of the articulating surface. [0006]
  • In an alternative embodiment the structural member is anchored on the femoral part by means of at least one fixing screw. A conical clamping device would be dispensed with in this case. [0007]
  • Use is preferably made of two structural members per endoprosthesis. However, use may also be made of only one structural member, which then has two articulating surfaces. [0008]
  • In another alternative embodiment the ceramic structural member is connected to the femoral part in nondetachable manner by shrinking, soldering or welding. Soldering also includes active soldering. [0009]
  • This attachment can be improved if the ceramic structural member is additionally connected to the femoral part by means of a congruent surface arrangement. The latter may be constituted by, for example, interlocking slots and ribs. In an advantageous configuration, the ceramic structural member is additionally connected to the femoral part by means of a slot/spring connection. The latter is particularly expedient when there is shrinking on. When there is a slot/spring connection, a rib on the structural member, for example, projects into a slot in the femoral part, or vice versa. However, many variants of the congruent surface arrangement are possible. [0010]
  • In another alternative embodiment the ceramic structural member is in the form of a layer and is secured or applied by vapour deposition, spray application or such like. The structural member is accordingly a layer in this case. of course, this layer may also consist of several individual layers. A ceramic material for the layer or the other structural members would be, for example, aluminium oxide. [0011]
  • Further features of the invention will emerge from the figures which are described below. Illustrated are: [0012]
  • FIG. 1[0013] a a cross-section through a femoral part with a structural member inserted with the aid of a conical clamping device,
  • FIG. 1[0014] b the same section as in FIG. 1a, but rotated through 180°,
  • FIG. 2 a lateral section through a femoral part with a structural member mounted with the aid of a conical clamping device, the conical clamping device being disposed only above the loading zone, [0015]
  • FIG. 3 the attachment of the structural member to the femoral part with the aid of a fixing screw and [0016]
  • FIG. 4 the attachment of the structural member to the femoral part by shrinking, [0017]
  • FIG. 4[0018] a representing a section like FIG. 1b and
  • FIG. 4[0019] b representing a section like FIGS. 2, 3.
  • In FIGS. 1[0020] a and 1 b a metallic femoral part 2 is shown in various sections. A slot 5 or two slots 5 are produced in the femoral part 2 in the region of the articulating surface. At their sides these slots 5 have conical surfaces with angles between 5° and 20°. Enclosed in the slots 5 are ceramic structural members 3 which have corresponding conical lateral surfaces, so that a conical clamping device 4 is formed. The structural members 3 are not shown articulating with a tibial part anchored in the tibia bone. In this embodiment the slot 5 extends along the entire articulating surface. However, several slots 5 or individual notches may also be provided so that the structural member 3 is anchored to the femoral part 2 only at individual points by means of a conical clamping device 4.
  • FIG. 2 shows a lateral section through a [0021] femoral part 2 with, likewise, a structural member 3 that is mounted with the aid of a conical clamping device 4. The conical clamping device 4 in this case, as distinct from the embodiment of FIG. 1, is disposed only above what is the loading zone when the knee is extended. To this end a clamping surface that is not as large as that in FIG. 1 is produced in the femoral part 2.
  • FIG. 3 shows the attachment of the ceramic [0022] structural member 3 to the femoral part 2 by means of a fixing screw 1. To this end a bore 7 is disposed in the structural member 3 and a thread 6 is disposed in the femoral part 2. The fixing screw 1 projects through the bore 7 into the thread 6 and in this way anchors the structural member 3 to the femoral part 2.
  • If necessary, several fixing screws can also be used, which are advantageously disposed sunk in the [0023] structural member 3.
  • FIG. 4 shows a [0024] femoral part 2 that has a slot 10 on its tibial side. The associated ceramic structural member 3 has a rib 11 that is congruent with the slot. FIG. 4a shows the femoral part 2 in cross-section and FIG. 4b shows it in longitudinal section. The structural member 3 is attached by shrinking it on. But it may also be soldered on or welded on. In this case the slot/spring connection may optionally be dispensed with.

Claims (5)

1. Knee-joint endoprosthesis with a metallic femoral part anchored in the femur that articulates with a tibial part anchored in the tibia bone, the articulating surface of the femoral part being a ceramic structural member that is connected to the femoral part in mechanically stable manner, characterised in that the ceramic structural member is non-detachably connected to the femoral part by shrinking on, soldering or welding.
2. Knee-joint endoprosthesis according to
claim 1
, characterised in that the ceramic structural member is connected to the femoral part additionally by means of congruent surface arrangements.
3. Knee-joint endoprosthesis according to
claim 2
, characterised in that the ceramic structural member is connected to the femoral part by means of a slot/spring connection.
4. Knee-joint endoprosthesis according to
claim 1
, characterised in that two structural members are used per knee-joint endoprosthesis.
5. Knee-joint endoprosthesis with a metallic femoral part anchored in the femur that articulates with a tibial part anchored in the tibia bone, the articulating surface of the femoral part being a ceramic structural member that is connected to the femoral part in mechanically stable manner, characterised in that the ceramic structural member is in the form of a layer and is secured by vapour deposition, spray application or such like.
US09/774,716 1997-01-17 2001-02-01 Fixation of a ceramic structural member by way of gliding component in a femoral part Abandoned US20010016778A1 (en)

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US09/774,716 US20010016778A1 (en) 1997-01-17 2001-02-01 Fixation of a ceramic structural member by way of gliding component in a femoral part
US10/209,936 US20020187251A1 (en) 1997-01-17 2002-08-02 Fixation of a ceramic structural member by way of gliding component in a femoral part

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DE19701621 1997-01-17
DE19701621.9 1997-01-17
DE19711628A DE19711628A1 (en) 1997-01-17 1997-03-20 Fixation of a ceramic component as a sliding component in a femur part
US09/008,427 US6214051B1 (en) 1997-01-17 1998-01-16 Fixation of a ceramic structural member by way of gliding in a femoral part
US09/774,716 US20010016778A1 (en) 1997-01-17 2001-02-01 Fixation of a ceramic structural member by way of gliding component in a femoral part

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US10/209,936 Division US20020187251A1 (en) 1997-01-17 2002-08-02 Fixation of a ceramic structural member by way of gliding component in a femoral part

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US09/774,716 Abandoned US20010016778A1 (en) 1997-01-17 2001-02-01 Fixation of a ceramic structural member by way of gliding component in a femoral part
US10/209,936 Abandoned US20020187251A1 (en) 1997-01-17 2002-08-02 Fixation of a ceramic structural member by way of gliding component in a femoral part

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US6214051B1 (en) 2001-04-10
JPH10201781A (en) 1998-08-04
US20020187251A1 (en) 2002-12-12
EP0855173B1 (en) 2003-10-01
EP0855173A2 (en) 1998-07-29
CA2226239A1 (en) 1998-07-17
EP0855173A3 (en) 1998-12-30

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