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1、BRITISH STANDARD BS 2930:1970 Incorporating Amendment No. 1 Specification for Surgical spring trusses Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 12:37:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2930:1970 This British Standard, having been approved by the Surgical Instruments and Me
2、dical Appliances Industry Standards Committee, was published under the authority of the Executive Board on 31 March 1970 BSI 02-2000 First published December 1957 First revision March 1970 The following BSI references relate to the work on this standard: Committee reference HCC/9 (formerly SGC/9/2)
3、Draft for comment 68/8144 ISBN 0 580 05552 3 Co-operating organizations The Surgical Instruments and Medical Appliances Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and professional and
4、 industrial organizations: Association of Hospital Matrons British Dental Association British Medical Association* British Surgical Trades Association (Inc.)* British Rubber Manufacturers Association Ltd. Institute of British Surgical Technicians Medical Defence Union Medical and Dental Defence Unio
5、n of Scotland Medical Protection Society Ministry of Agriculture, Fisheries and Food Ministry of Defence, Air Force Department Ministry of Defence, Army Department Ministry of Defence, Navy Department Department of Health and Social Security* Queens Institute of District Nursing Royal College of Mid
6、wives Royal College of Nursing Royal College of Obstetricians and Gynaecologists Royal College of Physicians of London Royal College of Physicians and Surgeons of Glasgow Royal College of Surgeons of Edinburgh Royal College of Surgeons of England* Royal College of Veterinary Surgeons Royal Institute
7、 of Public Health and Hygiene The Government department and professional and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the Committee entrusted with the preparation of this British Standard: Aluminium Development Asso
8、ciation British Investment Casters Technical Association British Steel Industry British Orthopaedic Association British Plastics Federation Central Council for the Care of Cripples Institution of Production Engineers National Federation of Hospital Officers National Pharmaceutical Union Surgical App
9、liance Manufacturers Association Individual firms Amendments issued since publication Amd. No.Date of issueComments 5865May 1989Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 12:37:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2930:1970 BSI 02-2000i C
10、ontents Page Committees responsibleInside front cover Forewordii 1Scope1 2Classification1 3Terminology1 4General requirements for all metal components2 5Spring2 6Plate3 7Rivets3 8Assembly of plate to spring3 9Studs3 10Screws3 11Outer face covering of pad and spring5 12Felling piece5 13Plate cover5 1
11、4Core of the pad5 15Padding5 16Inner face covering5 17Fastening strap6 18Strap keeper6 19Sewing thread6 20Inguinal and femoral trusses assembly6 21Scortal and rat-tail trusses7 22Marking8 Appendix A Compressed granulated cork9 Appendix B Scoured white felt9 Appendix C Requirements for leather used i
12、n the manufacture of surgical spring trusses9 Figure 1 Stud for spring trusses4 Figure 2 Screw-stud for spring trusses4 Figure 3 Diagram of chape8 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 12:37:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2930:1970 ii BSI 02-2000 Foreword This stan
13、dard makes reference to the following British Standards and BS special publication: BS 93, British Association (BA) screw threads with tolerances for sizes 0 BA to 16 BA. BS 947, Specification for a universal system for designating linear density of textiles (Tex system). BS 1133, Packaging code Sec
14、tion 11:Packaging felt. BS 1309, Methods of sampling and analysis of vegetable-tanned and chrome-tanned leathers. BS 1449, Steel plate, sheet and strip Part 1:Specification for carbon and carbon-manganese plate, sheet and strip. BS 1554, Specification for stainless and heat-resisting steel round wir
15、e. BS 2874, Specification for copper and copper alloy rods and sections (other than forging stock). BS 3144, Methods of sampling and physical testing of leather. BS 4183, Machine screws and machine screw nuts metric series. The first edition of BS 2930 published in 1957 was prepared following a requ
16、est made by the Ministry of Health and was authorized by the Surgical Instruments and Medical Appliances Industry Standards Committee of the British Standards Institution. This revised edition of BS 2930 brings up to date present requirements for surgical spring trusses with respect to materials and
17、 methods of fabrication, together with such dimensions of components as are independent of individual clinical requirements. Provision is made for the use of adhesives in the construction of the pad. In accordance with prescribed national policy the opportunity has been taken for requirements to be
18、specified in metric units although equivalents in the customary imperial units have been included for convenience during the pending change to general use of the metric system in the United Kingdom. Likewise, provision has been made for use of screws having ISO metric threads which it is intended wi
19、ll ultimately take the place of the BA system of screw threads. Surgical elastic band trusses are dealt with in BS 3271. NOTEMetric units are to be regarded as the standard. Where equivalents are given in other units they are approximate. More accurate conversions should be based on the tables in BS
20、 350, “Conversion factors and tables”, or in BS 2856, “Precise conversion of inch and metric sizes on engineering drawings”. Imperial units have been retained, however, for certain textile requirements for which it would be currently impracticable to use metric units. A British Standard does not pur
21、port to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front
22、cover, pages i and ii, pages 1 to 12, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 1
23、2:37:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2930:1970 BSI 02-20001 1 Scope This British Standard specifies the materials used in the manufacture of component parts of surgical spring trusses, together with such dimensions as are independent of the individual clinical requirements. Provisio
24、n is made for inguinal, femoral and scrotal spring trusses. 2 Classification Surgical trusses are classified as follows: 1) By type: a. Spring; b. Elastic band; c. Bag. 2) By function: a. Inguinal; b. Femoral; c. Scrotal; d. Ventral (including umbilical). NOTE 1Provision is made for rat-tail trusses
25、 in Clause 21. NOTE 2This classification is provided for information only. In this standard, provision is not made for either ventral or bag type trusses. BS 3271 deals with elastic band trusses. 3 Terminology The following terms are employed in describing some of the components: 3.1 casing band, co
26、mprising: a) Outer face covering, also known as outer covering, head leather or top leather. The covering situated away from the patients body. b) Spring, also known as the circular spring band. c) Padding, also known as blanketing. The material used between the spring band and the inner face coveri
27、ng. d) Inner face covering, also known as inner covering or inner lining. Material which is situated next to the patients body. 3.2 pad that part controlling the hernia or rupture, and comprising: a) Outer face covering, also known as outer covering, head leather or top leather. The covering situate
28、d away from the patients body. b) Felling piece. Material stitched beneath the outer face covering to enable this to be stitched to the inner face covering. c) Plate cover. Material encasing the plate. d) Plate (including the sprag), also known as the truss head. The metal foundation for the pad. e)
29、 Sprag, also known as nail. Projection from the plate, used for securing the core to the plate. f) Core of the pad. Contoured mound situated on the inner face of the plate. g) Padding. Material buffering the core of the pad from the patients body. h) Inner face covering, also known as pad cover, inn
30、er covering or inner lining. Material which is situated next to the patients body. j) Strap keeper. A loop of suitable material fitted over the outer face covering of pad or casing band to retain the endstrap or cross-strap after fastening. 3.3 fastening straps a) Tailstrap. Short leather strap, bei
31、ng the termination of a fabric extension to the truss pad, which extension is known as the understrap. b) Understrap. Otherwise known as perineal strap, leg strap, groin strap or tail. A narrow component which passes between the patients legs linking the lower portion of the pad to the body band at
32、the rear of the truss. The linkage to the pad, or to the band or both, should permit for length adjustment. c) End strap. Fastening strap on a truss with a single pad (also see Clause 17). d) Cross-strap. Fastening strap on a truss with two pads (also see Clause 17). Licensed Copy: sheffieldun sheff
33、ieldun, na, Mon Nov 27 12:37:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2930:1970 2 BSI 02-2000 4 General requirements for all metal components Metal components shall be free from defects, shall be cleanly finished and all sharp edges shall be removed. 5 Spring 5.1 Material. The spring shall b
34、e made from one piece of strip steel complying with grade 70 or grade 80 of BS 1449-11). 5.2 Thickness of spring. The thickness of the spring shall be one of the following: and shall be selected in relation to the length and width of the spring to give a spring of strength in accordance with the cli
35、nical requirements. Where the fitting measurement is less than 720 mm (30 in) the thickness of the spring may be in the following range: 5.3 Width of spring. The width of the spring shall be one of the following: and shall be selected in relation to the length and thickness of the spring to give a s
36、pring strength in accordance with the clinical requirements. 5.4 Shaping. The spring shall be shaped to meet general anatomical requirements and the ends of the spring shall comply with the following: 1) The ends of the spring shall start and terminate on the anterior face of the body, except that t
37、he spring ends may finish short of the anterior face of the body in the case of special needs, e.g. deformity or if an artificial leg is worn. 2) The free end of the spring shall be shaped away from the body sufficiently to prevent pressure. 3) The free end of the spring may be tapered in its thickn
38、ess if requested by the purchaser. 5.5 Rivet holes. Holes for rivets shall be cleanly punched when the spring is in the unhardened condition. 5.6 Slots for screws. If provided, slots for screws shall be punched when the spring is in the unhardened condition. The slot for screwed fittings shall have
39、a width of 4.00 0.05 mm (5/32 0.002 in) for springs of 10.0 mm width. The slot for springs of 11.0 mm and 12.0 mm width shall be of 4.75 0.05 mm (3/16 0.002 in) width. Slots shall be radiused at both ends and the exposed end or ends of slotted springs shall be dull polished. 5.7 Heat treatment. The
40、spring shall be hardened by heating to about 800 C (a temperature indicated when the material is of dull cherry red colour) and quenching in oil. The spring shall be tempered by heating to 350 C to 450 C and quenched. 5.8 Removal of scale. All loose scale shall be removed after heat treatment. 1) BS
41、 1449, “Steel plate, sheet and strip”, Part 1, “Specification for carbon and carbon-manganese plate, sheet and strip”. 2.0 mm (0.079 in) 1.8 mm (0.071 in) 1.6 mm (0.063 in) 1.4 mm (0.055 in) 1.2 mm (0.047 in) 1.0 mm (0.039 in) 0.9 mm (0.035 in) 0.8 mm (0.031 in) 0.7 mm (0.028 in) 10.0 mm (0.394 in)
42、11.0 mm (0.433 in) 12.0 mm (0.472 in) Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 12:37:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2930:1970 BSI 02-20003 6 Plate 6.1 Material. The plate shall be made of commercial mild steel, such as grades CR4, CS4, HR4 or HS4 specified in BS 1449-
43、12). 6.2 Thickness. The thickness of the plate shall be 1.2 mm to 1.6 mm (0.047 in to 0.063 in) to give adequate strength to meet the requirements of the patient except that for plates of very small sizes required for trusses for babies a plate thickness of 0.9 mm (0.036 in) may be employed. 6.3 Man
44、ufacture. The plate shall be made in one piece and shall be slightly domed by pressing or beating. 6.4 Sprag. The sprag shall be formed by one of the following methods: 1) By suitably piercing the plate and bending up a pointed portion of the plate itself. 2) By riveting a pointed piece of steel wir
45、e into the plate. 7 Rivets The rivets shall be flat head “tinmans” rivets made of soft iron and the shanks of the rivets shall be not less than 3.2 mm (1/8 in) diameter. 8 Assembly of plate to spring The plate shall be secured to the spring by not fewer than two rivets or two screws. 9 Studs 9.1 For
46、m. Riveting studs shall be fitted, or alternatively screw threaded studs may be fitted in the case of slotted springs. The form of the studs shall correspond to the form and dimensions given in Figure 1 or Figure 2 as appropriate. 9.2 Material. Studs shall be manufactured from free machining brass r
47、od complying with the requirements of BS 28743). 9.3 Finish. Studs shall be cleanly finished, nickel plated and polished. 9.4 Assembly of riveting studs to plate. The ends of the shanks shall be riveted over to form a slightly domed head. The head of the stud shall be supported during riveting in su
48、ch a manner as to prevent damage to the plating. 10 Screws 10.1 Design. Screws used for fitting with slotted springs shall be cheesehead or panhead screws of 10 mm (3/8 in) nominal length with ISO metric screw threads4) complying with the requirements for normal class bolts specified in BS 41835). T
49、he size of screw shall be related to the width of slot as follows: 2) BS 1449, “Steel plate, sheet and strip”, Part 1, “Specification for carbon and carbon-manganese plate, sheet and strip”. 3) BS 2874, “Specification for copper and copper alloy rods and sections (other than forging stock)”. 4) During the transition period for general adoption of the metric system in the UK, screws having BA threads in accordance with BS 93, “British Association (BA) screw threads with tolerances for sizes 0 BA to 16 BA”, may be used as given in the table. Width of
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