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IS 3391 (1965): Stethoscopes [MHD 13: Veterinary Hospital Planning and Surgical Instruments]
IS : 3391- 1965
Indian Standard
SPECIFICATION FOR
STETHOSCOPES
UDC 616-071.6:615.
BIJREAU O F I N D I A N S T A N D A R D S
MANAK BIIAVAN, 9 BAIIADUR SIIAH ZAFAR MARC
NEW DELHI 110002
Gr 3 (^) February 1966
Is : 3391.
Indian Standard
SPECIFICATION FOR
STETHOSCOPES
Anaesthesia, Resuscitation and Allied Equipment Sectional Committee,
CPDC 13
Chairman
DR B. BEATTACHARJEE
Representing
Safdarjang Hospital, Central Government Health Scheme ( Ministry of Health ), New Delhi
Members
Saab H. GHOSH Indian Oxygen Ltd, Calcutta
SHRI A. N. MUKEWI ( Alternab 1
DR M. S. N. GINWALLA
LT-COL N. NARASIMIXAN
SHRI M. G. PANDIT
COL K. R. RAXA RA O
SHRI MTJNDKU~ RA~HUVEER RA O
SHRI MAHESR M. SH A H
COL M. SHANXHLA
SSSI K. L. TA L W A R
SH~I A. B. RA O,
Deputy Director ( Consumer
Products ) ( Secretary )
bental Council of India, New Delhi Ministry of Defence ( DGAFMS ) Ministry of Health Military Hospital, [ M i n i s t r y o f Defence ( DGAFMS ) 1, New Delhi Anaesthetics, Bombay National Surgical Instruments Co, Bombay Directorate General of Technical Development ( Ministry of Industry & Supply ) Chief Inspectorate of General Stores [Ministry of Defence (DGI ) 1, Kanpur
Director, IS1 ( Ex-oficio Member)
Stethoscopes and Blood Pressure Apparatus Subcommittee,
CPDC 13:
Convener SHRI MAEESH M. SH A H
Members
COL H. B. LAL
SERI B. B. SAXKAR
Sam K. L. TA L W A R
National Surgical Instruments Co, Bombay
Safdarjang Hospital, Central Government Health Scheme ( Ministry of Health ), New Delhi National Instruments Ltd, Calcutta Chief Inspectorate of General Stora [Ministry of Defence ( DGI ) 1, Kanpur
SH~I H. C. MUKEERJEA (Alternate )
SHRI A. N. VIO ISCOMED Industries Private Ltd, Bombay SHRI R. N. VIO ( Altemate )
B U R E A U O F I N D I A N S T A N D A R D S MANAK BlIAVAN, 9 BAIIADUR SHAH ZAFAR MARG NEW DELI11 110002
Is : 3391.
animal body. It does not cover special stethoscopes such as multiple
lead diaphragm ones or those with extra chest pieces used for demons-
tration purposes.
- TERMINOLOGY
2.1 For the purpose of this standard, the nomenclature of various parts shall be as indicated in Fig. 1 to 4.
- TYPES
3.1 A stethoscope may have a chest piece of either bell type or diaphragm type or dual type having a combination of both ( see 6.4 ).
- MATERIALS
4.1 The side arms and Y-pieces of stethoscopes shall be made of solid- drawn brass tube conforming to IS : 407-1961*.
4.2 Recommended materials for the manufacture of other parts of stetho- scopes are as follows:
Part
a) Stethoscope binaural section
Ear-piece
Spring
Material
Aluminium, bakelite, plastics or nylon.
Steel conforming to designation C55, C55Mn75 with silicon from 1.5 to 2. percent r 55Si2Mn90 of IS : 1570-
- The steel use&shall not have sulphur and phosphorus more than O-05 percent each.
- Rivet
b) Chest piece, bell type
c) Chest piece, diaphragm type and chest piece, dual type
Body
Retaining ring
Diaphragm
Cap, if provided
d) Rubber tubing
Brass or stainless steel.
Aluminium, brass or plastics.
Aluminium alloy, die cast or brass. Brass, nylon or plastics.
Celluloid or plastics. Stainless steel or brass sheet conforming to any grade of IS: 410-1959x.
Conforming to Grade I of IS : 63 7- 1955$.
*Specification for brass tubes for general purposes ( rcvisud ). -@heMules for wrought steels for general engineering purposes. SSpecification for rolled brass plate, sheet, strip and foil ( mued). ~Spccitication for plain rubber tubmg.
IS : 3391- 1965
SPRlNG,FOLOABLE
OR NON -FOLDABLE
RUBBER TUBE
RUBBER TUBE
CHEST PIECE
FIQ. 1 STETHOSCOPE , SCHEMATIC
IS : 3391- 1965
6mmb
FIN. 3 Y-PIECES TYPICAL
E A R - P I E C E , T Y P I C A L ,
E N L A R G E D
F O L D A B L E
T O S U I T E A R - P I E C E
ADJUSTABLE
T Y P E ‘NON- FOLDABLE
All dimensions in millimetre
Fm. 4 STETHOSCOPE, BI N A U R A L S E C T I O N, TY P I C A L
Is:33911196!i
6.7 The spring shall be evenly hardened and tempered ( see 8.1 and 8.2 for
tests ) and shall be of one of the following constructions:
a) One-piece construction, that is, non-foldable, either rigidly soldered to or adjustable by means of screws on the arms of the binaural sections.
b) Two-piece construction, that is, foldable, either rigidly soldered to or adjustable by means of screws on the arms of the binaural sections.
6.8 The ends of binaural sections may be bent slightly ( see Fig. 4 ) to accommodate the direction of the ear holes; in the case of foldable spring, the binaural section may be left straight.
- WORKMANSHIP AND FINISH
7.1 Workmanship
7.1.1 All metal parts shall be finished smooth all over and shall be free from burrs, cracks or other manufacturing defects. All sharp edges and corners shall be slightIy rounded. The screw threads shall be well and evenly cut and all threaded parts shall fit firmly without play.
7.1.2 Residue of soldering and brazing flux shall be removed to prevent corrosion.
7.2 Finish-All brass parts shall be chromium plated over nickel con- forming to Grade C of IS : 1068-1958*.
- TESTS
8.1 Test for Hardness of Spring - When tested for hardness, the spring shall have a hardness of 450 to 550 HVor 45 to 52 HRC ( see IS : 1501-1959t and IS : 1.586-1960$ ). For measurement of hardness,, any recognized hardness tester suitable to the respective scale may be used.
8.2 Test for Spring - The binaural section of the stethoscope shall be placed vertically on a flat surface. Holding the ear pieces between the thumb and fingers of each hand, the arms of the stethoscope shall be so separated that they subtend an angle of 90” with each other. The arms shall then be released and the above test repeated three times. On comple- tion of the test, the spring shall not take a new position.
8.3 Test for Soldering of the Spring to the Tubes - One arm of the binaural sectional shall be firmly gripped in one hand and the spring in the other hand. With moderate force an attempt shall be made to rotate the
*Specification for copper, nickel and chromium electroplated coatings. tMethod for Vickers hardness test for steel. fMethod for Rockwell hardness test (B and C scales ) for steel.
IS : 3391- 1965
arm inside the collar of the spring. No movement whatsoever shall occur. I This test shall then be repeated on the opposite arm.
9. PERFORMANCE
9.1 The stethoscope shall be tested to hear heart beats or other body sounds
from lungs, wind pipe, pulse, etc. The body sounds shall be clearly audible
to the person using the itethoscope.
9.2 The ear piece of the stethoscope shall fit the external auditory meatuses, so that outside noises will be excluded as far as possible and.the instrument causes no discomfort.
10. MARKING
10.1 Each stethoscope shall be legibly and indelibly stamped on the binaural section and the chest piece with the manufacturer’s name, initials or recog- nized trade-mark.
10.1.1 Stethoscope may also be marked with the IS1 Certification Mark. NoTE-T~~ use of the IS1 Certification Mark is governed by the provisions of the Indian Standards Institution ( Certification Marks ) Act, and the Rules and Regulations made thereunder. Presence of this mark on products covered by an Indian Standard conveys the assurance that they have been produced to comply with the requirements of that standard, under a well-defined system of inspection, testing and quality control during production. This system, which is devised and supervised by IS1 and operated by the producer, has the further safeguard that the products as actually marketed are cor.tinuously checked by IS1 for conformity to the standard. Details of conditions, uxler which a licence for the use of the IS1 Certification Mark may be granted to manufacturers or processors, may be obtained from the Indian Standards Institution.
11. PRESERVATIVE TREATMENT AND PACKING
11.1 The rubber tubing shall be dusted with French chalk.
11.2 The stethoscopes shall be wrapped in soft tissue paper and packed in c,Aico cloth bound card-board carton or other suitable leather or plastics (‘X>C.
11.3 A label shall be fixed on the carton indicating the manufacturer’s n;lme, initials or trade-mark.
