Kenya Standard KS 2552: Mouth props and airways (London Hospital Pattern) Specification

Transcription

1 Kenya Standard KS 2552: 2018 Mouth props and airways (London Hospital Pattern) Specification KEBS 2018 First Edition 2018

2 KS 2552: 2018 TECHNICAL COMMITTEE REPRESENTATION The following organizations were represented on the Technical Committee: Nursing Council of Kenya Ministry of Health Government Chemist's Department Coast Provincial Hospital County of Nairobi Association for the Physically Disabled of Kenya Christian Health Association of Kenya (CHAK) Kenyatta National Hospital Kenya Bureau of Standards Secretariat REVISION OF KENYA STANDARDS In order to keep abreast of progress in industry, Kenya Standards shall be regularly reviewed. Suggestions for improvements to published standards, addressed to the Managing Director, Kenya Bureau of Standards, are welcome. Kenya Bureau of Standards, 2018 Copyright. Users are reminded that by virtue of section 25 of the Copyright Act, Cap. 12 of 2001 of the Laws of Kenya, copyright subsists in all Kenya Standards and except as provided under section 26 of this Act, no Kenya Standard produced by Kenya Bureau of Standards may be reproduced, stored in a retrieval system in any form or transmitted by any means without prior permission in writing from the Managing Director. ii KEBS 2018 All rights reserved

3 Kenya Standard KS 2552: 2018 Mouth props and airways (London Hospital Pattern) Specification KENYA BUREAU OF STANDARDS (KEBS) Head Office: P.O. Box 54974, Nairobi-00200, Tel.: ( ) , , Fax: ( ) Web: Coast Region Lake Region Rift Valley Region P.O. Box 99376, Mombasa P.O. Box 2949, Kisumu P.O. Box 2138, Nakuru Tel.: ( ) , /40 Tel.: ( ) 23549, Tel.: ( ) , Fax: ( ) Fax: ( ) KEBS 2018 All rights reserved iii

4 KS 2552: 2018 Foreword Kenya Bureau of Standards is a national standards body (NSB). The work of preparing Kenya Standards is normally carried out through national 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. National organizations, governmental and non-governmental, in liaison with KEBS, also take part in the work. Kenya Standards are drafted in accordance with the rules given in the KS ISO/IEC Directives, Part 2. The main task of technical committees is to prepare National Standards. Draft Kenya Standards adopted by the technical committees are circulated to the technical committee members for balloting. Publication as a Kenya Standard requires approval by at least 2/3 of the members casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. KEBS shall not be held responsible for identifying any or all such patent rights. This Kenya Standard was prepared by Technical Committee KEBS/TC 136, Medical Tools, devices and Equipment. During the development of this standard, reference was made to the following document: IS: Mouth props and airways (London hospital pattern). This assistance is hereby highly acknowledged. iv KEBS 2018 All rights reserved

5 Kenya Standard KS 2557: 2018 Mouth props and airways (London Hospital Pattern) Specification 1 Scope This Kenya National Workshop Agreement standard covers the requirements for mouth props and airways (London Hospital Pattern). 2 Shape and dimensions 2.1 The general shape, dimensions and range of nominal sizes of mouth props and airways (London Hospital Pattern) shall be as given in Figure 1 and Table 1. Table 1 Dimensions of mouth props and airways (Clause 2.1) Size H A B C Large Medium Small The mouth props shall be of the following three sizes: a) Large 15 mm b) Medium 12 mm c) Small 10 mm 2.3 Each mouth prop shall be provided with a 1.6-mm hole at the base to allow it to be used with a chain or a wire. When specifically required, three mouth props, one of each size, shall be supplied together as a set, in which case they shall be linked by means of aluminimum chains approximately 15 cm long with links made of 1 mm diameter aluminimum wire. 3 Material The mouth props and airways shall be manufactured from a corrosion-resisting metal or a metal finished with durable and corrosion resisting surface coating. The material used shall be in no way harmful to human tissue. Aluminium, stainless steel and carbon steel (chromium plated) are suitable materials for these mouth props and airways. The mouth props may be made also from suitable elastomeric materials. 4 The surface of the mouth props and airways shall be smooth and free from pits, scratches,and grinding marks. The edges shall be smoothly rounded off and shall nowhere be sharp. If plated, the plating shall be chromium over nickel conforming to Annex A. KEBS 2018 All rights reserved 1

6 KS 2552: Test 5.1 Practical test A compressive force of 25 kgf shall be applied to each mouth prop in turn in such a maaner that the force acts at right angles to the axis and through its mid point and tends to compress the opposite surfaces towards each other. The maximum force shall gradually be attained and swhll act for two minutes. On completion of the test the mouth props shall not have taken on a new permanent shape and shall show no sign of damage. 6 Marking 6.1 Each mouth prop shall be legibly and indelibly marked with the manufacturer s name, initials or recongnized trade-mark and the year of manufacture The mouth props and airways may also be marked with the S-Certification Mark. NOTE The use of the S-Certification Mark is governed by the provisions of the Kenya Bureau of Standards (Certification Marks), and the Rules and Regulatins made thereunder. Presence of this mark on products covered by a Kenya Standard conveys the assurance that they have been produced to comply with the requirements of that standard, under a well-defined system of inspeciton, testing and quality control during production. This system, which is devised and supervised by KEBS and operated by the producer, has the further safe guard that the products as actually marketed are continuously checked by KEBS for conformity to the stanard. Details of conditions, under which a licence for the use of S- Certfidicatin Mark may be granted to manufacturers or processors, may be obtained from the Kenya Bureau of Standards.. 7 Packing 7.1 The mouth props and airways shall be wrapped in suitable material and packed in cardboard boxes or cartons. 7.2 A label shall be fixed on each carton indicating the manufcturer s name, initials or trade mark. 2 KEBS 2018 All rights reserved

7 Kenya Standard KS 2552: 2018 A.1 Nickel deposit Annex A (normative) Specification for nickel-chromium deposits in stethoscopes A.1.1 The type of nickel shall be indicated by the following symblols placed after the chemical symbol Ni followed by figures denoting thickness of nickel deposit. b for nickel deposited in fully bright condition. This type of deposit usually contains a little sulphur derived from brighteners. p for dull or semi-bright nickel requiring polishing to give full brightness, containing less than % sulphur 1, and passing the ductility test given in KS ISO 8401:1986. d for a double-layer nickel coating, of which the bottom layer contains less that % sulphur 3) and passes the ductility test given in KS ISO 8401:1986 and the top layer contains more than 0.04 % sulphur 3) ; the thickness of the bottom and top layers shall not be less than 60 percent and 20 percent respectively of the total nickel thickness.. A.1.2 Thickness of nickel deposit This is specified in microns and denotes the minimum thickness of the nickel measured by the stripping method given in KS ISO 1461 which shall be present at any point of the significant surface that may be. A.2 Chromium deposit A.2.1 The type of chromium deposit shall be designated by the following symblols placed after the chemical symbol Cr;. r f for regular or common type of chromium having a minimum thickness of 0.3 micron. for chromium free from cracks, when checked by the microscopic method (except for cracks extending from the edges of the component to 25 % of the width of the component or 10 mm whichever is the less) and having a minimum thickness of 0.8 micron. A.2.2 Thickness of chromium deposit This is specified in microns and denotes the minimum thickness of the chromium deposit, measured by the stripping method given in KS ISO 1461, which shall be present at any point of the significant surface that may be touched by a ball 20 mm in diameter. A.2.3 Example of complete classificatin number For example, S Ni40b Cr r shall denote a coating on steel consisting of 40 microns (minimum) of bright nickel followed by 0.3 micron (minimum) regular chromium. A.2.4 Coatings appropriate to each service grade number 1 The sulphur contents are specified in order to indicate the type of nickel plating solution that is to be used. No simple method exists for determining the sulphur content of a nickel deposit on a coated article An accurate determination is possible on a specially prepared test specimen. KEBS 2018 All rights reserved 3

8 KS 2552: 2018 Table 1 gives the Classification Numbers corresponding to each Service Grade Number for nickel-chromium plating on iron and steel. Table 1 Nickel-chromium plating on iron and steel Servicer Grade No. Classification No 4 S Ni40p Cr r S Ni40d Cr r S Ni40d Cr.f S Ni40b Cr r S Ni30p Cr r 3 S Ni30d Cr.r S Ni30d Cr.r 2* S Ni20b Cr.r 1* S Ni10b Cr.r *p- or d-nickel and f-chromium may be substituted for b-nickel and r-chromium in Service Grade Numbers 2 and 1. A.3 Adhesion Adhesion of the coating shall be tested by the method given in KS ISO The coating should continue to adhere to the basis metal when subjected to this test. A.4 Corrosion resistance The plated article should be subjecyted for the specified duration to one of the corrosion tests shown in Table 2 to be appropriate for the particular Service Grade Number. The coating shall not show appreciable corrosion as indicated by the development of rust spots. Unless other wise agreed between the purchaser and the supplier, appreciable corrosion shall be defined as the presence of more thant two corrosion spots per square decimeteres and not more than 10 corrosion spots in asny single area covering 25 cm 2, as seen with the naked eye. 4 KEBS 2018 All rights reserved