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Publication numberUS3671978 A
Publication typeGrant
Publication dateJun 27, 1972
Filing dateAug 9, 1971
Priority dateAug 9, 1971
Publication numberUS 3671978 A, US 3671978A, US-A-3671978, US3671978 A, US3671978A
InventorsMay Denis Ronald William
Original AssigneeHanger & Co Ltd J E
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Angular adjustment devices for use in artificial limb manufacture
US 3671978 A
Abstract
An adjustment means for pre-setting relative angularity between the axes of two parts of an artificial limb or prosthesis comprising wedge shaped discs mutually rotatable about an axis and having inter-engaging eccentric means for imparting a transverse translational movement between the discs upon relative rotation to eliminate variation of axial spacing between the outer surfaces of the discs upon adjustment thereof.
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United States Patent May [ 1 June 27, 1972 [54] ANGULAR ADJUSTMENT DEVICES FOR USE IN ARTIFICIAL LIMB MANUFACTURE [72] Inventor: Denis Ronald William May, London, En-

gland J. E. Ranger and Company Limited, London, England Aug. 9, 1971 [73] Assignee:

[22] Filed:

211 App]. No.: 170,098

Related US. Application Data [63] Continuation-impart of Ser. No. 848,865, Aug. 11,

1969, abandoned.

[56] Relerences Cited UNITED STATES PATENTS 3,414,908 12/1968 Waggott et al "3/1 Primary Examiner-Richard A. Gaudet Assistant Examiner--Ronald L. F rinks Attorney-imirie & Smiley [57] ABSTRACT An adjustment means for pre-setting relative angularity between the axes of two parts of an artificial limb or prosthesis comprising wedge shaped discs mutually rotatable about an axis and having inter-engaging eccentric means for imparting a transverse translational movement between the discs upon relative rotation to eliminate variation of axial spacing between the outer surfaces of the discs upon adjustment thereof.

4 Claims, 5 Drawing figures SHEET IN 2 PATENTEUJum m2 m/mvroz 25111.9 7?. w MAY 67 ATToR/YHJ PATENTEnJum m2 3. 671 me SHEET 2 BF 2 AWE/1 r02 psms 1?. w MA) A Tram 5K9 ANGULAR ADJUSTMENT DEVICES FOR USE IN ARTIFICIAL LIMB MANUFACTURE CROSS-REFERENCE TO RELATED APPLICATION This application is a continuation-in-part of application Ser. No. 848,865, filed Aug. 1 1, 1969 and now abandoned.

BACKGROUND OF THE INVENTION In US. Pat. No. 3,4l4,908 there is described an alignment device in which angular alignment is adjusted by means of at least two discs of wedge shaped cross-section which are relatively rotatable about the axis of the limb and lockable in ad justed position by manually operable threaded means.

An inherent disadvantage lies in the use of plain discs of wedge shaped cross-section, in that relative rotation about their centers to obtain a given tilt automatically entails an alteration in the axial distance between their outer surfaces at the center. 1 This means that any threaded locking means passing through the center of the discs in the normal fashion is either effectively loosened or jammed by an angular adjustment Operation.

SUMMARY OF THE INVENTION According to the invention, an angular adjustment device for use in artificial limb manufacture comprises at least one pair of discs of wedge shaped cross-section located between two surfaces whose mutual inclination is to be adjusted, the discs of each pair being rotatable relatively to each other upon release of axially located threaded locking means, wherein eccentrically located inter-engaging abutment means are provided at the interface of each pair of discs whereby a relative translational movement is generated along that face sufficient to counteract change in the axial distance between the outer surfaces-of the discs otherwise encountered.

The action of the eccentric abutment means is the equivalent of pushing in or retracting one wedge sufficiently to compensate for the increase or decrease of the axial distance referred to.

The preferred form of abutment means to effect the relative translational movement between discs takes the form of a shallow circular eccentric depression in one disc engaged by a complementary eccentric boss on the other disc.

The degree of eccentricity necessary to achieve the desired efiectof constant height in a pair of relatively rotatable discs can be calculated theoretically.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is an isometric view showing the inner contact face of a disc of wedge shaped crosssection formed with a shallow ec centric boss;

FIG. 2 is an isometric view of a companion wedge-shaped disc showing the inner working face thereof;

FIG. 3 is a cross-sectional view taken axially of an assembly of discs with associated parts of the prostheses;

FIG. 4 is a side elevation of a schematic single pair of discs at maximum tilt, and

FIG. 5 is a schematic side elevation of two pairs of discs of wedge shaped cross-section separated by a flat disc and shown with no tilt.

DETAILED DESCRIPTION OF THE INVENTION Referring first to FIG. 1, a wedge-shaped disc having an axial bore la and an inclined working face lb, has a diameter D and a maximum thickness or height d.

Its wedge angle is shown as and the amount of eccentricity of the shallow boss 2 is designated e.

A companion wedge-shaped disc 3 is shown in FIG. 2 as having an eccentric recess or depression 4 within an inclined working face 3b and concentrically surrounding an opening 3a through the disc 3.

The relationship of the boss and recess may be reversed as shown in FIG. 3, wherein the recess 4' is in the working face lb of the disc 1' and eccentrically surrounding the bore Ia, and the boss 2 is on the working face 3b of the disc 3' concentric with the through opening 3a.

In assembly with the prosthesis, as shown in FIG. 3, the pair of discs 1, I and 3, 3 have their working faces 1b, lb and 3b, 3b engaged with the boss 2, 2 nested within the recess 4, 4'. The pair or pairs of discs are sandwiched between slotted upper and lower end plates 10 and 11 of the prostheses and secured by a bolt 12 extending through the discs and plates as well as a clamp including a socket portion 13 having a through opening 14 and a ball portion 15 having a bore 16.

Whereas, the bore la, la is of a diameter to closely fit the bolt 12, the opening 3a, 3a is of substantially larger diameter than the bolt to permit lateral movement of the disc relative to the bolt.

Referring next to FIG. 4, the disc 1 is shown engaged with the second disc 3, the boss 2 being nested in the recess 4. The discs are at the maximum angle of tilt on the effective radius R. The radius of the central interface between the discs is designated r.

Where r=R-(d-(D/2) tan 0) then e r sin 6.

Lastly referring to FIG. 5, there are shown two pairs of discs 1 and 3, and 5 and 7, separated by a plain disc 9 of thickness t.

Again the efiective radius of tilt is R, the radius of the central interface between discs 5 and 7 is r and the radius of the central interface between discs 1 and 3 is r while the eccentricities are denoted e, and e then e r sin 0 and 2 r sin 0.

It will be clear that alternative eccentric abutment means may be employed, for example, a pin extending from one disc engaged in a groove in its fellow disc.

It will also be apparent that the drawings show exaggerated angles and eccentricities, which in practice are much smaller; the last may be only a few thousandths of an inch in practice.

I claim:

1. An angular adjustment device for interpositioning between two parts of a prosthesis, comprising at least one pair of discs of wedgeshaped cross-section, each pair having a central interface and outer surfaces engageable with parts of the prosthesis which are connected by locking means extending through said discs,

said discs being relatively rotatable about an axis for adjustment of the angle between the prosthesis parts, and interengaging abutment means at said interface and eccentric of said axis to impart relative translational movement to said discs upon relative rotation thereof to maintain a substantially constant axial distance between said outer surfaces of each pair as established by said locking means.

2. An angular adjustment device according to claim 1 in which the extent of eccentricity e of said abutment means is equal to r sin 0 where r is the radius of the central interface between a pair of discs taken from the center of the effective radius of tilt and 0 is the wedge angle of the discs.

3. An angular adjustment device according to claim 1, wherein said interengaging abutment means comprises an eccentric recess in one disc and an eccentric boss on the other disc and nested in said recess.

4. An angular adjustment device according to claim 3 wherein said locking means comprises a bolt and nut, one of said discs having an axial bore joumalled on said bolt, and the other of said discs having an enlarged opening concentric with its eccentric means to permit lateral movement of said disc relative to said bolt.

4. An angular adjustment device according to claim 3 wherein said locking means comprises a bolt and nut, one 0 said discs having aaxial bore joumalled on said bolt, and the other of said discs having a enlarged opening oncentric with its eccentric means to permit laeeral movement of said dis relative to said bolt.

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Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3414908 *Aug 6, 1965Dec 10, 1968Vissa LtdAlignment devices for use with prostheses
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4302856 *Jul 10, 1979Dec 1, 1981J. E. Hanger & Company LimitedArtificial limbs
US4728336 *Nov 21, 1986Mar 1, 1988J. E. Hanger & Company LimitedAlignment device for artificial limbs
US4883494 *Nov 19, 1987Nov 28, 1989J. E. Hanger & Company LimitedShift device for a prosthetic limb
US4904270 *Mar 24, 1988Feb 27, 1990J. E. Hanger & Company LimitedHip joint for prosthetic leg
US5139524 *Jan 18, 1990Aug 18, 1992Prosthetics Research StudyProsthetic alignment device supplementally secured by a hoop stress
US5158570 *May 10, 1991Oct 27, 1992College Park Industries, Inc.Prosthetic foot with improved ankle and elastomeric heel pad
US5405410 *Jul 14, 1993Apr 11, 1995Ohio Willow Wood CompanyAdjustable lower limb prosthesis having conical support
US5425782 *Jan 18, 1994Jun 20, 1995Phillips; Van L.Alignment fixture for prosthetic device
US5507818 *Jun 30, 1994Apr 16, 1996Mclaughlin; John A.Multipolar joint endoprosthesis
US5514186 *Mar 8, 1994May 7, 1996Phillips; Van L.Attachment construction for prosthesis
US5728176 *Oct 30, 1995Mar 17, 1998Flex-Foot, Inc.Attachment construction for prosthesis
US5800565 *Apr 27, 1995Sep 1, 1998Biedermann Motech GmbhLeg prosthesis with quick exchange and displacement adjustment connections
US6254559 *Aug 30, 1999Jul 3, 2001Anthony C. TyrrellAdjustable hip joint assembly
US6488644 *Jun 23, 1999Dec 3, 2002Becker Orthopedic Appliance Company, Inc.Coupling and orthotic brace incorporating the coupling
US7166132 *Jan 29, 2004Jan 23, 2007Incumed, Inc.Adjustable bone prostheses and related methods
US7179259Jun 4, 2004Feb 20, 2007Biomet Manufacturing Corp.Instrument assembly for lateral implant
US7641698Jan 5, 2010Biomet Manufacturing Corp.Modular hip joint implant
US8066779Nov 29, 2011Biomet Manufacturing Corp.Modular hip joint implant
US20020087216 *Feb 25, 2002Jul 4, 2002Atkinson Stewart L.Prosthetic walking system
US20040186579 *Jan 29, 2004Sep 23, 2004Incumed, Inc.Adjustable bone prostheses and related methods
US20070118230 *Jan 22, 2007May 24, 2007Incumed, Inc.Adjustable bone prostheses and related methods related applications
US20070162140 *Dec 13, 2006Jul 12, 2007Mcdevitt Dennis MMethod and apparatus for reconstructing a joint
US20100114324 *Dec 22, 2009May 6, 2010Biomet Manufacturing Corp.Modular Hip Joint Implant
EP0285328A1 *Mar 24, 1988Oct 5, 1988J.E. HANGER & COMPANY LIMITEDHip joint for prosthetic leg
EP0707840A2 *Oct 11, 1995Apr 24, 1996M+IND (Model + Instrument Development)Angular adjustment system for pylon/prosthetic foot interface
EP1568337A1 *Feb 22, 2005Aug 31, 2005Bauerfeind AGOrthosis for the correction of the position of an anatomical joint
WO1994004102A1 *Aug 10, 1993Mar 3, 1994Ohio Willow Wood CompanyAdjustable lower limb prosthesis and adjustment apparatus
Classifications
U.S. Classification623/38
International ClassificationA61F2/50, A61F2/76
Cooperative ClassificationA61F2002/5018, A61F2/76
European ClassificationA61F2/76