Electronic Stethoscope

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Using Electronic Stethoscope For Auscultation

Electronic Stethoscope
Using electronic stethoscope for auscultation
Using electronic stethoscope for auscultation

This electronic stethoscope is commonly used in B600 and D100, It is efficient, convenient and accurate.

Battery Specifications

ITEMParameter
Battery Type3.7V/2000mAh lithium ion polymer battery
Battery Operation Time60 Hours
Battery Use-life300 cycles
Charging Time4 hours

Technical Specifications

ITEMParameter
Binaural headsetYES
Chest-pieceYES
Sound processingDigital signal processor
Display Screen1.3’ Color OLED
Low Battery IndicatorYES
Automatic Power OffNo
Volume Control1-3 level
Sound AmplifierAmplifies up to 4X
Signal Sampling Rate8 kHz
Frequency ResponseHeart Sound Mode:20-500Hz
Lung Sound Mode: 200-2000Hz
Total harmonic distortion<3%
*Sound Attenuation100-500 Hz: ≦12dB 500-1000 Hz: ≦20dB
Intuitive keypadNO
Direct ListeningOnly transferred via headset
Recording and PlaybackNot on the device itself
Wireless TechnologyBluetooth® at 2.4GHz
DimensionØ58mm×78mm

Safety Classification

ItemParameter
Electric Shock Protection TypeInternal power supply equipment (A rechargeable 3.7V/2000mAh lithium ion polymer battery), or Input 0.2A/5VDC
Electric Shock Protection LevelBF
Liquid Access Proof LevelIP22
Bluetooth SpecificationVersion: Bluetooth® 4.0
RF frequency2.4GHz
Maximum Output Power-20-4dBm
Frequency Range 2402-2480 MHz
Transmission rate1M/S
Single-channel bandwidth1Mbps
Transmission Distance(Max.)3 m
  • Note: The Sound Attenuation is the essential performance.
  • Note: Patient with cardiac pacemaker should be operated by the advise of the doctors.

There are two kinds of auscultation modes (heart sound mode, lung sound mode), the switch of auscultation mode can be realized in two ways:

1) under the main interface, by pressing “return / mode key”, the mode can be switched; 2) under the menu interface, the mode sub-menu can select the auscultation mode, and the current auscultation mode can be seen as the mode icon under the main interface.

5.Adjust Volume

The volume of the auscultation signal could be adjusted. There are two ways to adjust the volume: 1) On the home interface, adjust by “Menu +/Volume” “Menu-/Volume-“; 2) adjust the volume by sub-menu on the menu page.

6.Adjust Display Brightness

The backlight under the menu page adjusts the brightness of the display. The factory default is 80%. The OLED displays the backlight brightness for a long time during long standby time.

7. Monitor Patient Heart Rate

The hand-held stethoscope is placed in the red circle of the human body to mark the position to hear the sounds of lungs, heart, each time the auscultation time should be more than 30 seconds (as shown below)

Location when Heart sound detection

Location when Heart sound detection

Location when Lung sound detection

Location when Lung sound detection

The collected data will be saved in real time on the system, and all the data can be reviewed under the “Local Record” on the “Setting”. Click on the data files to play back the historical data. During playback, drag the progress bar of the playback file to perform fast forward and backward operations. All the data files can be found in the folder of your software.


Appendix EMC Declarations

TABLE 1: Guidance and manufacturer´s declaration – electromagnetic emission

The model smartho-D2 is intended for use in the electromagnetic environment specified below. The customer or the user of the model smartho-D2 should assure that it is used in such an environment.

Emissions testComplianceElectromagnetic environment – guidance
RF emissions CISPR 11Group 1The Model smartho-D2 uses RF energy only for its internal function. Therefore, its RF emissions are very low and are not likely to cause any interference in nearby electronic equipment.
RF emissions CISPR 11Class BThe Model smartho-D2 is suitable for use in all establishments, including domestic establishments and those directly connected to the public low-voltage power supply network that supplies buildings used for domestic purposes.
Harmonic emissions
IEC 61000-3-2
Not applicable
Voltage fluctuations / flicker emissions
IEC 61000-3-3
Not applicable

TABLE 2: Guidance and manufacturer´s declaration – electromagnetic immunity

The Model smartho-D2 are intended for use in the electromagnetic environment specified below. The customer or the user of the Model smartho-D2 should assure that it is used in such an environment.

Immunity testIEC 60601
test level
Compliance levelElectromagnetic environment –
guidance
Electrostatic
discharge (ESD)
IEC 61000-4-2
± 8 kV contact
±2 kV, ±4 kV, ±8 kV, ±15 kV air
± 8 kV contact
±2 kV, ±4 kV, ±8 kV, ±15 kV air
Floors should be wood, concrete or
ceramic tile. If floors are covered with synthetic material, the relative humidity should be at least 30 %.
Power frequency
(50/60 Hz)
magnetic field
IEC 61000-4-8
30 A/m, 50/60Hz30 A/m, 50/60HzPower frequency magnetic fields should be at levels characteristic of a typical location in a typical commercial or hospital environment.

NOTE: UT is the a. c. mains voltage prior to application of the test level.


TABLE 3: Guidance and manufacturer’s declaration – electromagnetic immunity

The smartho-D2 is intended for use in the electromagnetic environment specified below. The customer or the user of the smartho-D2 should assure that it is used in such an environment.

Immunity testIEC 60601 test levelCompliance level
Conducted RF
IEC 61000-4-6
Radiated RF
IEC 61000-4-3
3 Vrms
150 kHz to 80 MHz
6 Vrms 150 kHz to 80 MHz outside ISM bandsa
10 V/m
80 MHz to 2.7 GHz
N/A
10 V/m

Electromagnetic environment – guidance

Portable and mobile RF communications equipment should be used no closer to any part of the Models smartho-D2, including cables, than the recommended separation distance calculated from the equation applicable to the frequency of the transmitter. Recommended separation distance:

800MHz to 2.7GHz

800MHz to 2.7GHz

where P is the maximum output power rating of the transmitter in watts (W) according to the transmitter manufacturer and d is the recommended separation distance in metres(m).
Field strengths from fixed RF transmitters, as determined by an electromagnetic site survey, should be less than the compliance level in each frequency range.
Interference may occur in the vicinity of equipment marked with the following symbol:

  • NOTE 1: At 80 MHz and 800 MHz, the higher frequency range applies.
  • NOTE 2: These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures, objects and people.

a The ISM (industrial, scientific and medical) bands between 0,15 MHz and 80 MHz are 6,765 MHz to 6,795 MHz; 13,553 MHz to 13,567 MHz; 26,957 MHz to 27,283 MHz; and 40,66 MHz to 40,70 MHz. The amateur radio bands between 0,15 MHz and 80 MHz are 1,8 MHz to 2,0 MHz, 3,5 MHz to 4,0 MHz, 5,3 MHz to 5,4 MHz, 7 MHz to 7,3 MHz, 10,1 MHz to 10,15 MHz, 14 MHz to 14,2 MHz, 18,07 MHz to 18,17 MHz,21,0 MHz to 21,4 MHz, 24,89 MHz to 24,99 MHz, 28,0 MHz to 29,7 MHz and 50,0 MHz to 54,0 MHz.

b The compliance levels in the ISM frequency bands between 150 kHz and 80 MHz and in the frequency range 80 MHz to 2,7 GHz are intended to decrease the likelihood that mobile/portable communications equipment could cause interference if it is inadvertently brought into patient areas. For this reason, an additional factor of 10/3 has been incorporated into the formulae used in calculating the recommended separation distance for transmitters in these frequency ranges.

c Field strengths from fixed transmitters, such as base stations for radio (cellular/cordless) telephones and land mobile radios, amateur radio, AM and FM radio broadcast and TV broadcast cannot be predicted theoretically with accuracy. To assess the electromagnetic environment due to fixed RF transmitters, an electromagnetic site survey should be considered. If the measured field strength in the location in which the smartho-D2 is used exceeds the applicable RF compliance level above, the smartho-D2 should be observed to verify normal operation. If abnormal performance is observed, additional measures may be necessary, such as re-orienting or relocating the smartho-D2. d Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.


TABLE 4: Recommended separation distances between portable and mobile RF communications equipment and the model smartho-D2

The Model smartho-D2 is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The customer or the user of the Model smartho-D2 can help prevent electromagnetic interference by maintaining a minimum distance between portable and mobile RF communications equipment (transmitters) and the Model smartho-D2 as recommended below, according to the maximum output power of the communications equipment.

Separation distance according to frequency of transmitter (M):

Rated maximum output of transmitter
(W)
150 kHz to 80 MHz80 MHz to 800 MHz800 MHz to 2.7 GHz
0.010.120.120.23
0.10.380.380.73
11.21.22.3
103.83.87.3
100121223

For transmitters rated at a maximum output power not listed above the recommended separation distance d in metres (m) can be estimated using the equation applicable to the frequency of the transmitter, where P is the maximum output power rating of the transmitter in watts (W) according to the transmitter manufacturer.

  • NOTE 1: At 80 MHz and 800 MHz, the separation distance for the higher frequency range applies.
  • NOTE 2: These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures, objects and people.

TABLE 5: Recommended separation distances between RF wireless communications equipment

The device is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The customer or the user of the device can help prevent electromagnetic interference by maintaining a minimum distance between RF wireless communications equipment and the device as recommended below, according to the maximum output power of the communications equipment.

Frequency MHzMaximum Power
W
DistanceIEC 60601 Test LevelCompliance Level
3851.80.32727
45020.32828
7100.20.399
745
780
810
20.32828
870
930
1720
20.32828
1845
1970
2450
20.32828
52400.20.399

Electromagnetic Environment – Guidance

RF wireless communications equipment should be used no closer to any part of the device, including cables, than the recommended separation distance calculated from the equation applicable to the frequency of the transmitter. Recommended separation distance

Where P is the maximum output power rating of the ransmitter in watts (W) according to the transmitter manufacturer and d is the recommended separation distance in meters (m). Field strengths from fixed RF transmitter, as determined by an electromagnetic site survey, should be less than the compliance level in each frequency range. Interference may occur in the vicinity of equipment marked with the following symbol:

Note 1: These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures, objects and people.