Disclosure to Promote the Right To Information

Transcription

1 इ टरन ट म नक Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. ज न1 क अ+धक र, ज 1 क अ+धक र Mazdoor Kisan Shakti Sangathan The Right to Information, The Right to Live प0र 1 क छ ड न' 5 तरफ Jawaharlal Nehru Step Out From the Old to the New IS (1995): Orthopaedic Drilling Instruments - Drill Bits, Taps and Countersink Cutters [MHD 2: Orthopaedic Instruments, Implants and Accessories]! न $ एक न' भ रत क +नम-ण Satyanarayan Gangaram Pitroda Invent a New India Using Knowledge! न एक ऐस खज न > ज कभ च0र य नहB ज सकत ह ह Bhartṛhari Nītiśatakam Knowledge is such a treasure which cannot be stolen

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4 IS : 1995 ISO : 1991 Indian Standard ORTHOPAEDIC DRILLING INSTRUMENTS - DRliL BITS, TAPS AN-D COUNTERSINK CUTTERS UDC : BIS 1995 BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI February 1995 Price Group 3

5 Otthopaedic Instruments and AccessoriesSectionafCommittee, MHD 2 NATIONAL FOREWORD This Indian Standard which is identical with IS l : 1991 Orthopaedic drilling instruments - Pan 1 Drilfbiis, taps and countersink cutters, issued by the International Organization for Standardization (ISO), was adopted by thebureau of Indian Standards on the recommendation of the Orthopaedic Instruments and Access&es Sectional Committee and approval of the Medical Equipment and Hospital Planning Division Council. The text of above mentioned IS0 standardhas been approved as suitable for publication as Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to thefollowing: a) 9 Wherever the words International Standard appear referring to this standard, they should be read as Indian Standard. Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use appoint (.) as the decimal marker. In this adopted standard, reference appears to certain International Standards for which Indian Standards also exist. The corresponding Indian Standards which areto be substituted in their place are listed below along with their degree of equivalence for the editions indicated: International Corresponding Indian Degree of Standard Standard Equivalence IS : 1991 IS 9829 (Part 1) : 1981 Metal bone screws : Technically Pan 1 Screws with asymmetric~thread, variable equivalent fitting (spherical) and IS 9829 (Part 2) : 1981 Metal bone screws : Part 2 Screws with asymmetric thread, conical under surfaces The concerned technical committee has reviewed the provisions of IS l : 1983 referred in this-adopted standard and has decided that this is acceptable for use in conjunction with this standard. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS 2 : 1960 Rules for rounding off numerical values (revised). The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

6 Indian ORTHOPAEDIC DRILLING INSTRUMENTS - DRILL BITS, TAPS AND COUNTERSINK; ti#tters m.., 1 Scope This part of IS specifies materials and mechanical properties, dimensions and marking requirements for drill bits, taps and countersink cutters made of stainless steel for use in orthopaedic surgery with bone screws as specified in IS NOTES 1 The interrelationship of 4nternational Standards dealing with bone screws, bone plates and relevant tools is shown for information in annex A. 2 At present only stainless steel has been considered as a material for manufacturing these instruments. Other materials and coatings may be included at a later revision. 2 Normative references The following standards contain provisions which, through reference ini this text, constitute provisions of this part of IS At the time of publication, the editions indicated were valid. All standards are subject to revision, aind parties to agreements based on this part of IS are encouraged to investtgate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 5835:1881, implants for surgery - Metal bone screws wjth heq~#@ *dr&e connection, spherical under-surface of head, asymmetrical thread - Dimensions. IS :1883, instruments for surgery - Metallic materials - Part 1: Stalhless steel. 3 Materialb and mechanical properties Drill bits, taps%~i~&~nt~rsink cutters shall be made from metal complyiqg with the requirements given in IS , irefere@ze letter of steel grade: D, H, I and R. 4 Dlmenribn8 4.1 Drill bits The diameter of the drill bit shall be as -given in table 1. The potmangle shall be in the range 80 to laps The core diameter and outside diameter shall be as given In table 1. The thread form and pitch shall be that of, the appropriate screw as specffied in IS

7 IS : 1 IS :7, I 4.3 Couriters)hk cutters 5 Mark!- The diameter of the pin and cutter head shall be as given in table 1 and figure 1. The cutter shall be either of colnical~ form with an angle of BY or of spherical form. 5.1 Drill blts Drill bits shall be marked with the diameter of the bit, expressed In millimetres. 5.2 laps Taps shall be marked with the code and nominal size of the screw, as specified in IS0 5835, with which they are Intended to be used. Figure 1 - Countersink cutter 5.3 Counterslnk cutters Countersink cutters shall be marked with the nominal sizes of the screw, as specified in IS0 5835, with which they are Intended to be used. Table I - Dlmenslons of drill bits, taps and countersink cutters Dimensions in mlllimetres Screws (These data are extracted from IS and are glven here for Informatlon.) Drill bits Taps ) Countersink cutters Mameter Diameter of drill of drill Intended Pin Intended Outslde Core IS Nominal Core for drlllfng Pitch dlameter Pitch for drllllng dlameter dlameter code dlameter diameter ptlot - clearance dt hole tapping hots A Cutter head dlameter d Screws wlth shallow thread: HA 1;s ,s 1,l HA2 2 1, , HA 2, ,7 2 2,7 f,6 1 2,5 6 HA , , HA I, , HA 4, ,75 4,5 3,2 4,5 3 1,75 4,s 8 HA ,75 5 3, ,75 4,5 8 Screws with deep thread: HB ,75 Not appll ,75 Not requlred for HS cable to HB 6,s ,75 3,2 6,s 3 2,75 screws HB screws 1) It is recommended that the maxlmum varlatlon from the theoretlcal profile at any point on thread form should not exceed: - 0,050 mm for HA 1,s and HA 2-6,075 mm for HA 2,7 to HA 5-0,075 mm for HEt 4 and HB 6,s

8 IS : 1995 IS : 1991 Annex A (informative) Interrelationship of International Standards dealing and relevant tools with bone screws, bone plates It has be n decided that the set of International Standards dealing with bone screws, bone plates and relevant tools sh uld be divided into two parallel series. The basis of the division into two series Is the essentially different de igns of the screw threads of the bone screws (HA and HEI type screws as opposed to HC and HD type screws). A simpli ed schematic guide illustrating the interrelationship between screws, plates and tools covered by the parallet f eries of International Standards is given on the following page. 3

9 IS 14mo:1QQs Is0 9714:1991 Thread Screw8 Heed under-rurface Drive connection HA u s-1 0 HB \ / \ / conical ec30 Single slot 1 Combined dr*ne connectiona - Mechanical requirements IS Breaking torque/ angle of rotation Single slot and crossrecessed head In preparation Cruciete slot and uo!8srecessed head Plates IS / = Is t IS I Keys and screwdrivers Driving toolr Screwdrhfers 1 IS I_ In preparation 4

10 IS : 199s IS : 1991 Annex B (informative) Biblihgraphy: International Standards referred -to in table in annex A Cl1 PI C33 c41 IS0 5835:1991, implants for surgery - Metal bone screws with hexagonal drive connection, spherical under-surface of head, asymmetrical thread - Dbnensions. ISO , implants for surgery - Metal bone plate - Holes corresponding to screws with~asym %,etrical thread and spherical undersurface. IS0 6475:1989, Implants for surgery - Metal bone screws with asymmetrical thread and spherical under-surface - Mechanical requirements and test methods. IS :1986. Orthopaedic instruments - Drive connections - Part I: Keys for use with screws with hexagon socket heads. c53 IS :1986, Orthopaedic instruments - Drive connections - Part 2: Screwdrivers for sing/e slot head screws, screws with cruciate slot and cross-recessed head screws. [61 c71 VI IS0 9268:1988, fmplants for surgery - Metal bone screws with conical under-surface of head - Dimensions.!SO 9269:1988, implants for surgery - Metal bone plates - Holes and slots corresponding to screws with conical under-surface. IS0 9585:1990, implants for surgery - Determination of bending strength and stiffness of bone p/&es. C91 IS l:lBBl, Orthopaedic drilling instruments - Part 1: Drill bits, taps and countersink cutters... ::