Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3793650 A
Publication typeGrant
Publication dateFeb 26, 1974
Filing dateSep 22, 1972
Priority dateSep 24, 1971
Publication numberUS 3793650 A, US 3793650A, US-A-3793650, US3793650 A, US3793650A
InventorsA Lee, R Ling
Original AssigneeNat Res Dev
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Prosthetic bone joint having a spacer device
US 3793650 A
Abstract
The intramedullary or equivalent stem of a prosthetic bone joint device is uniformly spaced within a bone canal during implantation using gap-filling cement. This achieved by using a spacer device having an annular base with at least three spring members extending from spaced points around the base, the spring members extending in a direction having radially outward and common axial components relative to the base. The base is formed to engage around and partway along the stem with its spring members facing forward. When the stem/spacer combination is implanted the springs act to centralise the position of the stem.
Images(1)
Previous page
Next page
Description  (OCR text may contain errors)

United States Patent Ling et a1.

1451 Feb. 26, 1974 PROSTHETIC BONE JOINT HAVING A SPACER DEVICE National Research Development Corporation, London, England Filed: Sept. 22, 1972 Appl. No.: 291,161

[73] Assignee:

Foreign Application Priority Data Sept. 24, 1971 Great Britain 44709/71 References Cited UNlTED STATES PATENTS 3/1905 Kroening 294/8628 1,791,859 2/1931 Brown 294/8628 1,487,440 3/1924 Butts 294/8626 3,016,556 1/1962 Greenleaf 287/86 3,067,740 12/1962 Haboiish 128/92 Primary ExaminerRichard A. Gaudet Assistant Examiner.l. Yasko Cushman ABSTRACT The intramedullary or equivalent stem of a prosthetic bone joint device is uniformly spaced within a bone canal during implantation using gap-filling cement. This achieved by using a spacer device having an annular base with at least three spring members extending from spaced points around the base, the spring members extending in a direction having radially outward and common axial components relative to the base. The base is formed to engage around and partway along the stem with its spring members facing forward. When the stem/spacer combination is implanted the springs act to centralise the position of the stem.

2 Claims, 1 Drawing Figure PROSTHETIC BONE JOINT HAVING A SPACER DEVICE This invention concerns prosthetic devices of the kind including a tapered stem which is to be secured by use of a gap-filling acrylic cement or similar medium in a medullary canal or a pre-prepared bore in a bone.

The tapering of the stem of such a device is advantageous in promoting extrusion of the cement into which it is pushed, so that the cement is forced into the adjacent bone and fills the space between the stern and bone to provide a secure bond. However, it is possible for the stem to be significantly off-set in the longitudinal sense relative to the canal or bore, and so give rise to potential weakness in the eventual bond because of the longitudinal region of thin cement which can result from the off-setting. The point to be appreciated in this last connection is that it is normally desirable that the stem be surrounded by a layer of cement having a certain minimum thickness. Certainly the stem should not contact the wall of the bone to any significant extent and, ideally, the stem should be centrally located within its canal or bore.

In this context the present invention provides a spacer device for use with a prosthetic device of the kind in question, which spacer device comprises a generally annular base member having at least three spring members extending from mutually spaced positions around the base member, the spring members extending in directions having an outward radial component and a common axial component relative to the base memberv In use of such a spacer device, the base member is threaded over the tip of the stem of the associated prosthetic device and passed partway therealong with the spring members directed away from the tip of the stem. This relative disposition of a spacer device and prosthetic femoral head-device is shown in the accompanying drawing with the former device denoted at 10 and having base and spring members 11 and 12, respectively, and the latter device denoted at 13 and having a stem 14. The base member is of generally rectangular form, as is the cross-sectional form of the stem, and four spring members extend from central positions of the respective sides of the base member. Clearly, the spring members will engage the wall of the medullary canal when the stem is inserted therein and act to maintain the stem generally centrally disposed in the canal.

Naturally, the base member of the spacer device needs to be dimensioned and shaped to accommodate the stem of an associated prosthetic device and to be slidable only partway therealong.

We claim:

1. A prosthetic bone joint device comprising: a component having a tapered intramedullary. stem extending therefrom; and a spacer device including an annular base member engaged around and partway along said stem, and at least three spring members extending from mutually spaced positions around said base member away from the free end of said stem in directions having an outward radial component and a common axial component relative to said base member.

2. A prosthetic bone joint device according to claim 1 wherein said stem has a generally rectangular crosssectional form, and wherein said base member is of similar rectangular form and has four like spring members individually extending from respectively different sides thereof.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US784055 *Mar 18, 1904Mar 7, 1905Charles W KroeningWell fishing-tool.
US1487440 *Apr 17, 1922Mar 18, 1924Butts Alden JFishing tool
US1791859 *May 11, 1928Feb 10, 1931Henry Brown CharlesFishing tool
US3016556 *Feb 27, 1958Jan 16, 1962Greenleaf Nathaniel BMop having a universally adjustable handle
US3067740 *Sep 8, 1959Dec 11, 1962Edward J HaboushHip joint prosthesis
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3939498 *May 28, 1975Feb 24, 1976National Research Development CorporationEndoprosthetic femoral head
US4064567 *Sep 15, 1976Dec 27, 1977The Sampson CorporationProsthesis-to-bone interface system
US4285071 *Jul 2, 1979Aug 25, 1981Nelson Carl LMethod of securing a prosthesis using cement spacers
US4302855 *Apr 27, 1979Dec 1, 1981Swanson Alfred BPlug for the intramedallary canal of a bone and method
US4644943 *Jul 20, 1984Feb 24, 1987Regents Of The University Of MinnesotaBone fixation device
US4753657 *Jan 15, 1985Jun 28, 1988University Of ExeterFixation of implants in bone
US5002580 *Oct 7, 1988Mar 26, 1991Pfizer Hospital Products Group, Inc.Prosthetic device and method of implantation
US5062854 *Jul 24, 1990Nov 5, 1991Pfizer Hospital Products GroupProsthetic device and method of implantation
US5080680 *Sep 4, 1990Jan 14, 1992Mikhail Michael W EFemoral stem prosthesis with preapplied cement mantle
US5092892 *Oct 23, 1990Mar 3, 1992Howmedica International Inc.Intramedullary centralizer
US5108439 *Sep 11, 1991Apr 28, 1992Sulzer Brothers LimitedCentering element for a shank of a joint endoprosthesis
US5116380 *Feb 28, 1991May 26, 1992Zimmer, Inc.Prosthetic implant with spacers having tapered trailing edges
US5147408 *Jun 19, 1991Sep 15, 1992Pfizer Hospital Products Group, Inc.Prosthetic device and method of implantation
US5171275 *Dec 6, 1991Dec 15, 1992Ling Robin S MFemoral stem prosthesis
US5171288 *Mar 22, 1991Dec 15, 1992Mikhail Michael W EFemoral stem prosthesis with preapplied cement mantle
US5290318 *Jul 20, 1992Mar 1, 1994Ling Robin S MFemoral stem prosthesis
US5326376 *Aug 23, 1993Jul 5, 1994Zimmer, Inc.Femoral stem prosthesis
US5370695 *Apr 2, 1993Dec 6, 1994Sulzer Medizinaltechnik AgMetal shank
US5443523 *Mar 18, 1994Aug 22, 1995Mikhail; W. E. MichaelFemoral stem cement mantle
US5507831 *Jan 3, 1994Apr 16, 1996Burke; Dennis W.Distal stem centralizer for femoral prosthesis
US5554192 *Oct 5, 1994Sep 10, 1996Zimmer, Inc.Intramedullary implant stem and centralizer
US5593452 *Jul 18, 1995Jan 14, 1997Howmedica Inc.Coated femoral stem prosthesis
US5658351 *Jul 31, 1995Aug 19, 1997Howmedica Inc.For the stent of an orthopedic implant
US5697932 *Nov 9, 1994Dec 16, 1997Osteonics Corp.Bone graft delivery system and method
US5755793 *Sep 4, 1996May 26, 1998Bristol-Myers Squibb CompanyCentralizer for a prosthetic implant
US5972034 *Jul 28, 1998Oct 26, 1999Joint Enterprises, L.C. A Limited CorporationSelf-venting intramedullary cement restrictor
US5997581 *Dec 29, 1997Dec 7, 1999Johnson & Johnson Professional, Inc.Hip stem cement spacer
US6045555 *Dec 10, 1997Apr 4, 2000Osteonics Corp.Bone graft delivery system and method
US6142998 *Jan 3, 2000Nov 7, 2000Howmedica Osteonics Corp.Bone graft delivery surgical instruments
US6241772 *Jun 1, 1999Jun 5, 2001Benoist Girard SasPlugging and centralized device for locating the stem of a prosthesis
US6309395Apr 25, 2000Oct 30, 2001Howmedica Osteonics Corp.Bone graft delivery surgical instruments
US6322564Jun 14, 1999Nov 27, 2001Depuy Orthopaedics, Inc.Proximal alignment insertion guide and method therefor
US6926741Jan 25, 2002Aug 9, 2005Depuy Products, Inc.Centralizing cement plug with countersink
US7192448 *Jun 27, 2003Mar 20, 2007Ferree Bret AArthroplasty devices with resorbable component
US8361162 *Aug 22, 2006Jan 29, 2013Depuy International LimitedOrthopaedic joint prosthesis implant kit
US20100298943 *Aug 22, 2006Nov 25, 2010Daniel BerryOrthopaedic joint prosthesis implant kit
DE3015669A1 *Apr 23, 1980Nov 6, 1980Dow CorningIn den markkanal eines knochens einfuehrbares teil und verfahren zu seiner anwendung
EP0501116A1 *Jan 14, 1992Sep 2, 1992Zimmer, Inc.Prosthetic implant with spacers having tapered trailing edges
EP0530323A1 May 17, 1991Mar 10, 1993MIKHAIL, Michael W.E.Femoral stem prosthesis
EP1330994A1Jan 21, 2003Jul 30, 2003Depuy Orthopaedics, Inc.Centralizing cement plug with countersink
WO1992003991A1Aug 27, 1991Mar 5, 1992Wassef E Michael MikhailFemoral stem prosthesis with preapplied cement mantle
WO1997004723A1 *Jul 29, 1996Feb 13, 1997HowmedicaIntramedullary centralizer
Classifications
U.S. Classification623/23.46
International ClassificationA61F2/46, A61F2/30, A61F2/36, A61F2/00
Cooperative ClassificationA61F2230/0019, A61F2250/0097, A61F2002/30714, A61F2002/30617, A61F2/3676, A61F2/367, A61F2250/0089, A61F2002/30153, A61F2/30724, A61F2002/30571, A61F2002/4631
European ClassificationA61F2/30B2