ISO INTERNATIONAL STANDARD 9269 First edition 1988-12-01 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEKAYHAPOAHAA OPrAHM3ALMR NO CTAHAAPTM3ALMM Implants for surgery -- Metal bone plates - Holes and slots corresponding to screws with conical under-surface Implants chirurgicaux -- Plaques metalliques pour os - Chambrages et alésages pour vis a embaseconique Reference number ISO 9269 : 1988 (E) Not for Resale without license from IHS ISO 9269 : 1988 (E) Foreword ISo (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through Iso 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. ISO 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 approval before their acceptance as International Standards by the ISo Council. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 9269 was prepared by Technical Committee ISO/TC 150, Implantsforsurgery This first edition of iS0 9269 cancels and replaces the first edition of IS0 5836-4 : 1984, of which it constitutes a minor revision. Annexes A and B of this International Standard are for information only. @ International Organization for Standardization, 1988 Printed in Switzerland Copyright International Organization for Standardization Not for Resale d without license from IHS ISO 9269 : 1988 (E) INTERNATIONAL STANDARD Implants for surgery - Metal bone plates - Holes and slots corresponding to screws with conical under-surface Scope The depth of the countersink for holes or slots in flat plates hav- 1 ing a thickness of 1,6 mm or 1,4 mm shall be such as just to accommodate the countersunk surface of the screw head. This International Standard specifies the dimensions and tolerances of holes and slots in bone plates used as surgical im- For bone plates having a c irved surface, the depth of the plants so as to facilitate correct fixing using screws complying countersink for holes or slots shall be such that the land of the with ISO 9268. Hc2,9 screw lies between the upper and lower countersunk surfaces of the plates. NOTES 1 This International Standard does not deal with the shape and 3.2 Holes and slots in bone plates for use with screws dimensions of the plates or with the spacing (centre-to-centre of 3,5 mm, 3,9 mm and 4,2 mm nominal diameters distance) of the holes and slots. (HC3,5, HC3,9 and HC4,2 screws in accordance with 2 The interrelationship of International Standards dealing with bone ISO 9268) screws, bone plates and relevant tools is shown in annex A. Holes and slots in plates for HC3,5, HC3,9 and HC4,2 screws shall be in accordance with figures 1 and 2 and table 1. 2 Normative reference The depth of the countersink for holes or slots in flat plates hav- The following standard contains provisions which, through ing a thickness of 2,8 mm or greater shall be such that at least reference in this text, constitute provisions of this International half of the parallel depth of the head of the HC4,2 screw shall Standard. At the time of publication, the edition indicated was be below the external surface of the plate. valid. All standards are subject to revision, and parties to agreements based on this International Standard are encour- aged to investigate the possibility of applying the most recent Dimension in millimetres edition of the standard indicated below. Members of IEC and Iso maintain regist