ISO/IEC 9594-7:1990/Cor 2:1992
(Corrigendum)Information technology — Open Systems Interconnection — The Directory — Part 7: Selected object classes — Technical Corrigendum 2
Information technology — Open Systems Interconnection — The Directory — Part 7: Selected object classes — Technical Corrigendum 2
Technologies de l'information — Interconnexion de systèmes ouverts — L'Annuaire — Partie 7: Classes d'objets sélectionnés — Rectificatif technique 2
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INTERNATIONAL
STANDARD
9585
First edition
1990-l 2-15
Implants for surgery -
Determination of bending
strength and stiffness of bone plates
/mplants chirurgicaux
- Determination de la rbistance au pliage et de
la rigidit des plaques pour OS
Reference number
IS0 9585: 1990(E)
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IS0 9585:1990(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work
of preparing International Standards is normally carried out through IS0
technical committees. Each member body interested in a subject for
which a technical committee has been established has the right to be
represented on that committee. International organizations, govern-
mental and non-governmental, in liaison with ISO, also take part in the
work. IS0 collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an lnter-
national Standard requires approval by at least 75 % of the member
bodies casting a vote.
International Standard IS0 9585 was prepared by Technical Committee
ISO/TC 150, Implants for surgery.
6 IS0 1990
All rights reserved. No part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without
permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
ii
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INTERNATIONAL STANDARD IS0 9585:1990(E)
Implants for surgery - Determination of bending strength and
stiffness of bone plates
2.5 equivalent bending stiffness: Stiffness of the
1 scope
plate calculated from the dimensions of the test
configuration and the slope S of the linear part of the
This international Standard describes a test method
load/deflection diagram defined by the mechanical
for determining the bending strength and stiffness
test.
of straight bone plates. It may also be used to test
plates having a small initial curvature intended to
Unit: N-m*
produce pre-loading of the bone when fitted and to
test the straight portion of angled plates. This test
NOTE 2 This equivalent bending stiffness takes account
method is not recommended for plates of length less
of the holes or slots in the plate.
than 50 mm nor for plates designed to be used with,
or forming parts of, intramedullary devices.
3 Apparatus
NOTE 1 A test method for plates of length less than
50 mm is in preparation. 3.1 Test rig, to produce a loading system in ac-
cordance with figure 1, the four rollers (indicated by
hatched circles) being so constrained that their axes
remain parallel.
2 Definitions
3.2 Rollers, of cylindrical form and of equal diam-
For the purposes of this international Standard, the
eters within the range of 8 mm to 13 mm, or of pro-
following definitions apply.
filed form corresponding to the cross-section of the
plate to be tested, and having a mean diameter
2.1 moment: Turning effect of a force about an axis,
within the range 8 mm to 13 mm. it is desirable that
expressed numerically by the product of the force F
one of the rollers be secured to the specimen to re-
and the distance h measured perpendicularly from
strain longitudinal movement and that ail rollers are
the axis to the line of action of the force.
secured to maintain their relative position.
Unit: N-m
3.3 Means of applying forces, e.g. a mechanical
testing machine.
2.2 bending moment, A&: Moment acting about an
axis perpendicular to the long axis of a body and
generally producing lateral deflection. 3.4 Device(s), for measurement of relative
displacement(s).
Unit: N-m
4 Procedure
2.3 deflection: Linear displacement due to bending
measured perpendicular to the original axis of the
4.1 General
plate.
Conduct bending tests using the apparatus specified
Unit: m
in clause 3. Use the cylindrical rollers to test flat
plates and plates of curved cross-section, in which
2.4 bending strength: Value of the bending moment
the deviation from flatness at the centre of the plate
at fracture, or at a specified proof point, whichever
does not exceed h/6, where h is the width of the
is the lower.
plate. Test other plates using rollers of suitable
profile.
Unit: N-m
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IS0 95853 990(E)
k/2
k/2
4 h )-~ k
wa h cc
Deflection form
Figure 1 - General arrangement of four-point berm test
Proof
load gg
Proof point
Offset = q
-
Deflection 6, metres
Figure 2 - Load deflection diagram
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IS0 9585:1990(E)
F to a base of deflection S until the value of I; is ob-
42 . Placement of test specimen
tained at which either the plate fractures, F= F max.
b or the plate deflects so tha
...
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