Source: http://www.google.com/patents/US5931871?dq=7350717
Timestamp: 2014-10-21 10:31:06
Document Index: 690770694

Matched Legal Cases: ['art 2', 'art 3', 'art 2', 'art 3', 'art 3', 'art 2', 'art 3']

Patent US5931871 - Kit of parts for a modular femur head prosthesis, in particular, a ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsThe kit of parts comprises a distal shaft part (2) and a neck part (3) which can be equipped with a joint ball (10), with the neck part being supported on the shaft part (2) by approximately rectangular shaped supporting surfaces (2c) and (3c) positioned transverse to the longitudinal axis (L) of the...http://www.google.com/patents/US5931871?utm_source=gb-gplus-sharePatent US5931871 - Kit of parts for a modular femur head prosthesis, in particular, a reoperation prosthesis, and a femur head prosthesis from such a kit of partsAdvanced Patent SearchPublication numberUS5931871 APublication typeGrantApplication numberUS 08/695,520Publication dateAug 3, 1999Filing dateAug 12, 1996Priority dateOct 21, 1993Fee statusPaidAlso published asDE59309210D1, EP0649642A1, EP0649642B1, EP0845251A1, EP0845251B1Publication number08695520, 695520, US 5931871 A, US 5931871A, US-A-5931871, US5931871 A, US5931871AInventorsNikolaus Baur, Stefan LamprechtOriginal AssigneeAllo Pro Ag, Sulzer Medizinaltechnik AgExport CitationBiBTeX, EndNote, RefManPatent Citations (31), Referenced by (11), Classifications (37), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetKit of parts for a modular femur head prosthesis, in particular, a reoperation prosthesis, and a femur head prosthesis from such a kit of partsUS 5931871 AAbstract The kit of parts comprises a distal shaft part (2) and a neck part (3) which can be equipped with a joint ball (10), with the neck part being supported on the shaft part (2) by approximately rectangular shaped supporting surfaces (2c) and (3c) positioned transverse to the longitudinal axis (L) of the shaft part (2). The shaft part (2) and the neck part (3) are provided with prismatic guide surfaces (2d) and (3d) brought together in a form-fit and orientated parallel to the longitudinal axis (L), and are rigidly connected to each other by an extensible shaft screw (11) which can be elastically prestressed to carry a predetermined bending moment. The guide surfaces (2d) and (3d) are formed at a spigot extension (2b) of the shaft part (2) and at a complementary recess (3b) of the neck part (3), respectively. This design allows a form-fitted centering and accurate positioning of the neck part (3) on the shaft part (2) by the guide surfaces (2d, 3d) and, independent therefrom, a force-locked connection between the neck part (3) and the shaft part (2) by way of the supporting surfaces (2c, 3c) which can be clamped against one another with the bias force of the extensible shaft screw (11).
We claim: 1. An arrangement for securing a modular femur head prosthesis in a femur bone comprising:a shaft having a longitudinal axis, a distal end portion adapted for insertion into the femur bone and a proximal end portion defining a support surface transverse to the longitudinal axis and a guide surface parallel to the longitudinal axis; a neck having a proximal end portion adapted for receiving an artificial joint ball and a distal end portion defining a support surface transverse to the longitudinal axis of the shaft and sized to be pressed against the shaft support surface, the distal end portion further defining a guide surface parallel to the longitudinal axis and conforming to the shaft guide surface; a fastener for coupling the neck to the shaft having an extensible screw that is elastically pre-stressed with a predetermined bias force, the extensible screw comprising first and second thickened guide sections separated from one another by an extensible section having a smaller transverse cross-section than the guide sections, the guide sections defining cylindrical outer locating surfaces, the shaft and the neck each defining a bore defining centering surfaces cooperating with the guide sections of the extensible screw; at least one filler body affixed to a side wall of the neck and extending laterally therefrom for replacing a missing piece of femur bone, wherein the filler body comprises a collar fixed to the neck along the longitudinal axis of the shaft; and wherein the extensible screw further comprises a head, the proximal end portion of the neck defining a second recess for receiving the head and the collar of the filler body, the neck further comprising a cover element covering the recess for tensioning against the collar. 2. A femur head prosthesis adapted for implantation in a femur bone comprising:a shaft having a longitudinal axis, a distal portion adapted for implantation into the femur bone and a proximal end portion defining a support surface substantially perpendicular to the longitudinal axis and a guide surface parallel to the longitudinal axis; an artificial ball joint; a neck having a proximal end receiving the artificial joint ball and a distal end portion defining a support surface substantially perpendicular to the longitudinal axis of the shaft and abutting against the shaft support surface, the distal end portion further defining a guide surface parallel to the longitudinal axis and conforming to the shaft guide surface; and a fastener coupling the neck to the shaft and having an extensible screw that is elastically pre-stressed with a predetermined bias force, the screw comprising a threaded section and first and second thickened guide sections separated from one another by an extensible section having a transverse cross-section which is smaller than a core cross-section of the threaded section. 3. A method for anchoring a femoral prosthesis into a femur bone of a patient comprising:securing a distal end portion of a shaft into a cavity of the femur bone; mounting a neck to a proximal end portion of the shaft by:positioning a transverse support surface of a distal end portion of the neck against a transverse support surface of the proximal end portion of the shaft; and pressing the transverse support surface of the distal end portion of the neck against the transverse support surface of the proximal end portion of the shaft; conforming a guide surface of the distal end portion of the neck to a guide surface of the proximal end portion of the shaft such that the guide surfaces are parallel to a longitudinal axis of the shaft; inserting an extensible screw through the neck into the proximal end portion of the shaft to press the neck against the support surface of the shaft; and tightening the extensible screw by means of a torque wrench with a bias force which is defined as a predetermined upper value of the tightening torque of the torque wrench, and which corresponds to a predetermined greatest bending moment introduced by a main load force applied at the neck in a laterally offset position with respect to the longitudinal axis of the shaft. 4. A femur head prosthesis comprising:a neck portion having a proximal portion adapted for receiving an artificial joint ball, the neck portion defining a neck bore therethrough; a shaft portion having a distal portion adapted for insertion into a femur bone, the shaft portion defining a shaft bore; said neck and shaft portions having distal and proximal transverse support surfaces, respectively, transverse to the axis, said transverse support surfaces abutting one another; the neck bore and the shaft bore meeting at a bore intersection and defining an axis; the neck bore and the shaft bore defining a first common-diameter, centering surface at said bore intersection; at least one of the neck bore and the shaft bore defining a second centering surface; the neck portion having a fastener support surface oriented transverse the axis; an elongate fastener comprising a head, engaging the fastener support surface, and a fastener shaft, extending through the neck bore and into the shaft bore; and said fastener shaft comprising:a fastener portion secured to the shaft portion; a first centering surface region sized and positioned to be adjacent to the first centering surface on both sides of said bore intersection; a second centering surface region sized and positioned to be adjacent to the second centering surface; and a reduced-diameter region between the first and second centering surface regions. 5. The prosthesis of claim 4 further comprising at least one filler body affixed to a side wall of the neck portion and extending laterally therefrom for replacing a missing piece of femur bone.
BACKGROUND OF THE INVENTION The invention relates to a kit of parts for a modular femur head prosthesis, in particular a reoperation prosthesis comprising a distal shaft part to be anchored in a femur bone and a neck part which can be fixed to the proximal end portion of the shaft part by means of a screw connection, and can be equipped with an artificial ball.
SUMMARY OF THE INVENTION The object of the invention is to provide a kit of parts for a femur shaft prosthesis of the named kind which is improved in this respect and has a simple and robust method of construction, the kit of parts comprising a few favourably stressed components and ensuring a permanent connection between the neck part and the shaft part, as well as between the neck part and the femur, which remains unaffected by the dynamic stresses or loads in the implantation region.
BRIEF DESCRIPTION OF THE DRAWINGS Advantageous embodiments of the subject matter of the invention are set forth in the dependent claims.
DESCRIPTION OF THE PREFERRED EMBODIMENTS The femur head prosthesis according to FIGS. 1 to 5 is part of a reoperation prosthesis which is intended for use with patients as a second or third prosthesis, by whom, for some reason, a corresponding, earlier implanted endoprosthesis must be reoperated and replaced, for example, due to loosening of the embedding of the prosthesis in the bone tissue. The femur head prosthesis as represented, includes a distal shaft part 2 to be implanted in a femur bone 1 and a neck part 3. The distal shaft part 2 is to be embedded in the femur by way of bone cement, or as shown, without cement. The neck part 3 is made of a metal well-tolerated by the body, e.g. titanium, and can be mounted on the proximal end piece 2a of the distal shaft part. The neck part 3 is provided as a replacement-for a missing piece of bone which, in the example as shown, is the proximal end piece of the femur bone 1 which, especially in reoperation cases, must often be partly or, as shown, fully removed surgically, as a result of decomposition manifestations and demineralisation of the bone tissue. The shaft part 2 comprises a shaft body, conically tapered from its end piece 2a towards its distal end piece (not shown), which is to be inserted in the femur bone 1 in the direction of its longitudinal axis and a spigot-like extension 2b formed on the end piece which projects into a complementary recess 3b formed in the neck part 3. The shaft body 2 is provided over at least a part of its longitudinal extent with a plurality of longitudinal grooves 5 and between them a plurality of knife-like longitudinal ribs 6 which penetrate the bone tissue. On account of this the shaft body is held secure against turning in the femur bone 1.
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Winkelstroeter KgEasily mounted tension screw for jaw expander appliancesEP0382395A1 *Jan 31, 1990Aug 16, 1990Smith &amp; Nephew Richards, Inc.Modular system for femoral fixationEP0399920A1 *May 9, 1990Nov 28, 1990Gilles BousquetIntramedullary shaft for a screwed prosthesisEP0592897A1 *Oct 1, 1993Apr 20, 1994Philipp Rolf KropfModular shaft for a hip prothesisFR2580171A1 * Title not availableFR2605514A1 * Title not availableFR2606273A1 * Title not availableFR2622791A1 * Title not availableFR2633509A1 * Title not availableWO1986003962A1 *Jan 9, 1986Jul 17, 1986Howmedica Uk LimitedJoint member for a hip prosthesisWO1991006260A1 *Oct 30, 1990May 16, 1991Constantin ProtogirouProsthesis of the hip- or knee-joint anchored with a prestressing element* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS6306174Dec 16, 1999Oct 23, 2001Benoist Girard SasFemoral componentUS6344060 *Aug 26, 1999Feb 5, 2002Plus Endoprothetik AgKit for implanting a cementable endoprosthesisUS6355068 *Jun 7, 2001Mar 12, 2002Hammill Manufacturing Co.Sight gauge modular joint and methodUS6652589 *Dec 18, 2001Nov 25, 2003Plus Endoprothetik AgKit for implanting a cementable endoprosthesisUS6866683Dec 13, 2002Mar 15, 2005Medicine Lodge, Inc.Modular implant for joint reconstruction and method of useUS6875239Apr 25, 2002Apr 5, 2005Medicinelodge, Inc.Modular prosthesis for replacing bone and methodUS6887276Dec 13, 2002May 3, 2005Medicine Lodge, IncModular implant for joint reconstruction and method of useUS6902583Apr 25, 2002Jun 7, 2005Medicinelodge, Inc.Tripartite attachment mechanism and method for a modular prosthesisUS7914584Oct 20, 2005Mar 29, 2011Biomet Manufacturing Corp.Prosthesis system with trunnion and removably coupled headUS8444699 *Feb 18, 2010May 21, 2013Biomet Manufacturing Corp.Method and apparatus for augmenting bone defectsUS20110202141 *Feb 18, 2010Aug 18, 2011Biomet Manufacturing Corp.Method and apparatus for augmenting bone defects* Cited by examinerClassifications U.S. Classification623/22.4International ClassificationA61F2/46, A61F2/08, A61F2/30, A61F2/00, A61F2/36Cooperative ClassificationA61F2002/30828, A61F2310/00023, A61F2220/0041, A61F2002/30507, A61F2002/30797, A61F2002/3694, A61F2220/0033, A61F2/0811, A61F2002/4631, A61F2/30734, A61F2/367, A61F2/36, A61F2002/30604, A61F2002/30879, A61F2002/30377, A61F2002/3083, A61F2002/30434, A61F2002/30332, A61F2002/3674, A61F2002/30433, A61F2002/3625, A61F2230/0019, A61F2002/30387, A61F2/3607, A61F2/30744, A61F2002/365, A61F2220/0025, A61F2002/30848, A61F2002/30153European ClassificationA61F2/30B6, A61F2/36D4Legal EventsDateCodeEventDescriptionJan 27, 2011FPAYFee paymentYear of fee payment: 12Jan 25, 2007FPAYFee paymentYear of fee payment: 8Nov 5, 2003ASAssignmentOwner name: CENTERPULSE USA INC., TEXASFree format text: PATENT RELEASE AGREEMENT;ASSIGNOR:UBS AG, STAMFORD BRANCH;REEL/FRAME:014699/0404Effective date: 20031002Owner name: CENTERPULSE USA INC. 12 GREENWAY PLAZA, SUITE 1000Free format text: PATENT RELEASE AGREEMENT;ASSIGNOR:UBS AG, STAMFORD BRANCH /AR;REEL/FRAME:014699/0404Jan 21, 2003FPAYFee paymentYear of fee payment: 4Nov 20, 2002ASAssignmentOwner name: UBS AG, STAMFORD BRANCH AS SECURITY AGENT FOR THEFree format text: SECURITY INTEREST;ASSIGNORS:CENTERPULSE ORTHOPEDICS INC.;CENTERPULSE USA HOLDING CO., CORPORATION, DELAWARE;CENTERPULSE USA INC., CORPORATION, DELAWARE;AND OTHERS;REEL/FRAME:013467/0328Effective date: 20021029Free format text: SECURITY INTEREST;ASSIGNORS:CENTERPULSE ORTHOPEDICS INC. /AR;REEL/FRAME:013467/0328RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google