Cosmed K4B2 User manual

Cosmed does not assume the liability for interpretation mistakes of this documentation or for casual or
consequential damages in connection with the provision, representation or use of this documentation.
No parts of this manual may be reproduced or transmitted in any form without the express permission of
COSMED Srl.
COSMED Software can be installed only in one device.
Excel is a registered trademark of Microsoft Corporation.
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Lotus 123 is a registered trademark of Lotus Development Corporation .
K4 b2User manual, XII Edition
01/2005
Copyright © 1998 COSMED
Copyright © 2003 COSMED
COSMED Srl -Italy
http://www.cosmed.it
Part N. C01508-02-91

2-K4 b2User Manual
Table of contents
Getting started 13
Important notices ........................................................................... 14
Intended use..............................................................................14
Warnings...................................................................................14
Contraindication ............................................................................. 16
Contraindications for the Spirometer tests................................16
Absolute contraindications.............................................16
Relative contraindications..............................................16
Contraindications for Bronchial provocation tests ...................16
Absolute contraindications.............................................16
Relative contraindications..............................................16
Contraindications for Exercise testing......................................16
Environmental condition of use...................................................... 17
Safety and conformity..................................................................... 18
Safety..............................................................................18
EMC...............................................................................18
Telemetry .......................................................................18
Quality Assurance ..........................................................18
Medical Device Directive (CE mark).............................18
FCC (only USA version)................................................18
Keynotes ......................................................................................... 19
Typographic keynotes...............................................................19
Graphic keynotes......................................................................19
System overview ............................................................................. 20
Portable Unit (PU)....................................................................20
Telemetry Data Transmission, Receiver Unit (RU) .................20
Battery Charger Unit (CU) .......................................................20
Flowmeter.................................................................................21
Gas analysers............................................................................21
PC Software..............................................................................21
Before starting................................................................................ 22
Checking the packing contents.................................................22
K4 b2standard packaging...............................................22
Warranty registration..................................................................... 23
Register the product via software...................................23
How to contact COSMED..............................................23
Complain, feedback and suggestions .............................23
Options/Accessories ....................................................................... 24
Accessories...............................................................................24
Options......................................................................................24
Telemetry data transmission...........................................24
Spirometry Kit................................................................24

Index -3
PC configuration required...............................................................25
Technical features ...........................................................................26
Portable Unit ..................................................................26
Receiver Unit .................................................................26
Battery charger Unit.......................................................26
Flowmeter ......................................................................26
Oxygen Sensor (O2).......................................................26
Carbon Dioxide Sensor (CO2)........................................26
Humidity absorber..........................................................26
Power Supply.................................................................26
Environmental Sensors...................................................26
Measurements27
Pulmonary function tests and measured parameters ....................28
Breath by Breath exercise testing.............................................28
Indirect Calorimetry .................................................................28
Lactate Threshold (V-Slope)....................................................28
O2 Kinetics...............................................................................29
Spirometry Tests (option).........................................................29
FVC -Forced Vital Capacity .........................................29
VC/IVC -Slow Vital Capacity and Ventilatory pattern.29
MVV -Maximum Voluntary Ventilation ......................30
Bronchoprovocation Response.......................................30
Installation 31
Installation sequence......................................................................32
Battery Charger Unit ................................................................32
Check voltage.................................................................32
Turn the Unit on.............................................................32
Charge the batteries........................................................32
Battery low.....................................................................33
Portable Unit.............................................................................33
Warm up.........................................................................34
Warming-up the unit by main power .............................34
Turning on/off the portable unit.....................................34
Connect the rechargeable battery...................................34
Receiver Unit............................................................................35
Turning on/off the receiver unit.....................................35
Receiver unit power supply............................................35
Calibration Gas Cylinder..........................................................35
Connecting the K4 b2to the patient................................................36
Assemble the mask and the flowmeter.....................................36
Using the "Ultimate Seal".........................................................36
Apply the seal to the mask .............................................37
To remove seal on mask.................................................37
Assembling the flowmeter for spirometry tests........................37

4-K4 b2User Manual
Fixing the K4 b2to the patient..................................................38
Connecting the K4 b2to the PC....................................................... 39
Connect the Portable Unit to the PC.........................................39
Connect the Receiver Unit to the PC........................................39
Software installation ...................................................................... 40
Installing the software...............................................................40
Run the software.......................................................................40
PC port configuration ...............................................................40
Software main features .................................................................. 41
Display......................................................................................41
Tool bar.....................................................................................41
Show/hide the toolbar.....................................................41
Dialog windows........................................................................41
Use of the keyboard........................................................41
Use of the mouse............................................................41
Scroll bars.................................................................................41
On line help ..............................................................................41
Software version.......................................................................41
Calibration 43
Gas calibration procedures............................................................ 44
Running the Calibration program.............................................44
Log file .....................................................................................44
Setting reference values............................................................44
Set the reference values using the PC software..............44
Set the reference values using the Portable Unit............45
Room air calibration.................................................................45
Room air calibration using the PC software...................45
Room air calibration using the Portable Unit.................45
Reference gas calibration..........................................................45
The calibration unit ........................................................46
Reference gas calibration using the PC software ...........46
Reference gas calibration using the Portable Unit..........46
Gas delay calibration ................................................................47
Delay calibration using the PC software........................47
Delay calibration using the Portable Unit ......................47
Print the calibration report........................................................48
Edit the calibration factors........................................................48
Turbine calibration......................................................................... 49
Assembling the flowmeter for calibration.....................49
Calibrating the turbine..............................................................49
Turbine calibration using the PC software.....................49
Turbine calibration using the Portable Unit ...................50
Checking the system signals .......................................................... 51
The control panel......................................................................51
Using the control panel...................................................51

Index -5
Operating modes 53
K4 b2Operating modes ..................................................................54
Holter Data Recorder................................................................54
Telemetry Data Transmission (option).....................................54
Serial (Laboratory) Station.......................................................54
Portable Unit User Interface diagram............................................55
Holter Data Recorder Mode............................................................56
Operating sequence ..................................................................56
Warming-up the system.................................................56
Enter new patient............................................................56
Calibrate and start the test..............................................56
Stop the test....................................................................57
Transferring test to PC ...................................................57
Telemetry Data Transmission Mode ...............................................58
Operating sequence ..................................................................58
Warming-up the system.................................................58
Connect the receiver unit to the PC................................58
Enable transmission .......................................................58
Enter new patient............................................................58
Enable reception on PC..................................................59
Calibrate and start the test..............................................59
Stop the test....................................................................60
Transferring test to PC ...................................................60
Serial Mode.....................................................................................61
Operating sequence ..................................................................61
Warming-up the system.................................................61
Connect the Portable unit to the PC...............................61
Calibrate the system.......................................................61
Enter patient data............................................................61
Start the test....................................................................62
Stop the test....................................................................62
Database Management 63
Exercise testing patient's database.................................................64
Enter a new patient...................................................................64
Find a patient............................................................................64
Edit patient data........................................................................64
Delete a patient.........................................................................64
Uploading tests from the Portable Unit..........................................65
Archive maintenance ......................................................................66
Reorganise the archive .............................................................66
Delete the archive.....................................................................66
Delete a test ..............................................................................66
Backup and restore...................................................................66
Backup............................................................................66
Restore............................................................................66

6-K4 b2User Manual
Spirometry patient's database ....................................................... 67
Patient Card....................................................................67
Visit Card .......................................................................67
Test Card........................................................................68
Import/export a Tests card........................................................68
Diagnosis Database...................................................................68
Spirometry program settings ......................................................... 69
Graphs ............................................................................69
Serial port.......................................................................69
Units of measurements...................................................69
Using extra fields............................................................69
Customise the fields .......................................................69
Exercise testing 71
Recommendations for the exercise testing .................................... 72
The evaluation of the cardiorespiratory function......................72
Precautions................................................................................72
Laboratory......................................................................72
Ending the test................................................................72
Preparing the patient.................................................................72
Before testing .................................................................72
Patient assent..................................................................73
Ending the test................................................................73
Real time test.................................................................................. 74
Start a test.......................................................................74
Abort the test without saving data..................................74
End the test saving data..................................................74
View data in real-time ..............................................................74
View graphs in real-time ................................................74
Parameters to view....................................................................74
Manual protocol........................................................................75
Enter Load and Phase.....................................................75
Set the markers...............................................................75
Automatic protocol...................................................................75
Modify the load during the test ......................................75
Set the BPM alarm....................................................................75
Enter the BPM................................................................75
Data management ......................................................................... 76
Viewing data.............................................................................76
View data in table form..................................................76
Creating graphs.........................................................................76
View data in graph form.................................................76
Customise the graphs......................................................77
Switch from graph to data and vice versa ......................77
Viewing predicted values .........................................................78
View predicted values....................................................78

Index -7
Anaerobic (Lactate) Threshold detection.................................78
View the Lactate Threshold ...........................................78
Detect the Lactate Threshold..........................................78
Customise graphs for the LT viewing............................78
Fittings......................................................................................79
Fit a graph with a linear regression................................79
Fit a graph with a Mono-exponential regression............79
Calculate the "Mean Value"...........................................80
Oxygen Kinetic.........................................................................80
Run the O2 Kinetic function ..........................................80
Information about the Test .......................................................81
View the Information.....................................................81
Modify the information..................................................81
Summary...................................................................................81
View the summary .........................................................81
Print the data.............................................................................81
Print the current window................................................82
Print the report................................................................82
View the report.........................................................................82
Data Editing ....................................................................................83
Editing values and input numerical values.....................83
Data filtering ..................................................................83
Using the User fields......................................................84
Deleting steps.................................................................84
Advanced Editing...........................................................84
Restore the original test..................................................85
Overwrite the original test..............................................85
Customise the desktop..............................................................85
Customise the display colours........................................85
Smart edit..................................................................................85
Apply the graphical noise suppression...........................85
Apply the threshold noise suppression...........................85
Customise the parameters.........................................................86
Create a new parameter..................................................86
Create a new predicted parameter...................................86
Exporting data..........................................................................87
Export a test....................................................................87
DDE with Excel .............................................................87
Creating Test Protocols ...................................................................88
Create a new protocol.....................................................88
Software configuration ...................................................................89
Data viewing.............................................................................89
Select the parameters to view.........................................89
Select the parameters to view during the test.................89
Sort the parameters.........................................................89
Steady State..............................................................................89

8-K4 b2User Manual
Customise the Steady State detection criteria ................89
Printout reports .............................................................................. 90
Set up the printout ..........................................................90
Select parameters to be printed.......................................90
Customise the printout header........................................90
Electronic reports (*.pdf) ...............................................91
Print the current window ..........................................................91
Print the customised report.......................................................91
Events management during exercise testing ................................. 92
Flow Volume loops...................................................................92
Flow Volume loop during the test..................................92
O2, CO2 vs Time......................................................................92
O2, CO2 vs Time during the test....................................92
O2 Saturation (optional)...........................................................93
O2 Saturation during the test..........................................93
Spirogram .................................................................................93
Spirogram during the test ...............................................93
View the events after the test....................................................93
Raw data...................................................................................93
Save Raw data................................................................94
Resting Metabolic Rate Test 95
Metabolism ..................................................................................... 96
Total Metabolic Rate ................................................................96
Resting Metabolic Rate (RMR)................................................96
Importance to measure RMR....................................................96
Measure of the rest metabolic rate with indirect calorimetry...96
How to perform a RMR test .....................................................96
Recommendations .......................................................................... 97
Resting metabolic rate test using the face mask.......................97
Resting metabolic rate test using the canopy option.................97
Performing a test using the face mask .......................................... 98
Calibrations...............................................................................98
How to prepare a patient...........................................................98
Start the test ..............................................................................98
Viewing the test........................................................................99
How to modify the average interval .......................................100
Print ........................................................................................100
Performing a test using the canopy option.................................. 102
Calibrations.............................................................................102
How to prepare the canopy and the patient.............................102
Replacement of the power plug....................................102
Connecting the Canopy................................................102
How to prepare the patient ...........................................103
Performing the test..................................................................103
Viewing the test......................................................................104

Index -9
How to modify the average interval.......................................104
Print ........................................................................................104
Sub-maximal Exercise Testing 105
Introduction...................................................................................106
Pre-test screening....................................................................106
Sub-maximal exercise testing.......................................................107
Considerations with sub-maximal exercise testing.................107
Staffing...................................................................................108
Test termination......................................................................108
Considerations for accuracy..........................................................109
Performing the test .......................................................................110
An example of testing protocol ..............................................110
Spirometry 111
Setting spirometry options............................................................112
Spirometry..............................................................................112
Automatic Interpretation..............................................112
Quality control .............................................................112
Parameters manager................................................................113
Predicted values manager.......................................................113
Predicteds set................................................................113
Set the current predicted...............................................114
Formula definition........................................................114
Page set-up..............................................................................115
Spirometry tests ............................................................................116
Forced Vital Capacity (pre)............................................................117
Recommendations ..................................................................117
Perform a FVC (pre) test........................................................117
Test encouragement................................................................117
Perform the FVC test with the encouragement............118
Slow Vital Capacity........................................................................119
Perform a SVC test.................................................................119
Maximum Voluntary Ventilation...................................................120
Perform a MVV test ...............................................................120
Bronchial Provocation Test ...........................................................121
Bronchodilator test .................................................................121
Methacholine and Histamine Bronchial provocation Tests....121
Perform the test.......................................................................122
Bronchial Provocation protocols Database.............................122
Enter a new Bronchial provocation protocol in the
archive..........................................................................122
Viewing results..............................................................................123
Tests of the current patient...........................................123
Delete a test..................................................................123
Printing results..............................................................................124
Printing Reports......................................................................124

10 -K4 b2User Manual
Printing the active window.....................................................124
To print the active window...........................................124
Printing a series of reports......................................................124
Electronic reports (*.pdf)........................................................124
Export data..............................................................................125
Export a test..................................................................125
External devices 127
GPS ............................................................................................... 128
GPS initialisation....................................................................128
Initialize the GPS..........................................................128
Fixing the antennato the subject.............................................128
Operating sequence.................................................................129
Run a test with GPS......................................................129
Monitoring GPS parameters in real time......................130
Pulse Oximeter (option)................................................................ 131
Operating Sequence................................................................131
System maintenance 133
System maintenance..................................................................... 134
Cleaning and disinfection.......................................................134
Preparing the disinfecting solution...............................134
Cleaning the turbine flowmeter....................................135
Precautions during the cleaning of the turbine.............135
Suggested disinfection solutions ..................................135
Masks cleaning and disinfection.............................................135
Disassembling the different parts of the mask .............135
Cleaning the mask........................................................135
Disinfecting the mask...................................................136
Permapure maintenance..........................................................136
Inspections..............................................................................136
Replace the fuses ....................................................................136
Appendix 139
Service -Warranty........................................................................ 140
Warranty and limitation of liability........................................140
Return goods policy for warranty or non warranty repair ......140
Repair Service Policy .............................................................141
Privacy Information ...................................................................... 142
Personal data treatment and purposes.....................................142
How your personal data are treated ........................................142
The consent is optional, but…................................................142
Holder of the treatment...........................................................142
Customer rights.......................................................................142
Converting factors configuration.................................................. 143
Calculations references ................................................................ 144

Index -11
VO2and VCO2........................................................................144
Anaerobic threshold (modified V-Slope)...............................144
O2kinetics ..............................................................................144
ATS 94 recommendations .............................................................145
ATS recommendations...........................................................145
Predicted values............................................................................146
Automatic diagnosis (algorithm)............................................147
Quality Control Messages ......................................................147
References.....................................................................................149
Gas Exchange References............................................149
Indirect calorimetry......................................................149
Spirometry....................................................................149
Sub-maximal testing.....................................................149

12 -K4 b2User Manual

Getting started

14 -K4 b2User Manual
Important notices
Intended use
The measurement of oxygen uptake during sport or real life activities is of great interest
for the development of training programs and the study of their effects on elite athletes
or for assessing the efficacy of a rehabilitation therapy.
A common method for assessing the effects of endurance training is the monitoring of
various respiratory parameters during submaximal exercise.
One difficulty to achieve this goal during sport that cannot be simulated in the
laboratory is to use a reliable and valid portable system to measure VO2and VCO2in a
field setting.
Such a portable apparatus may also be useful to determine the energy cost of many sport
and real life activities.
K4 b2is an electrical medical device designed to perform pulmonary function tests. It is
to be used by physicians or by trained personnel on a physician responsibility.
Caution: Federal law restricts this device to sale by or on the order of a physician.
This equipment has been conceived with the aim of providing an auxiliary instrument
allowing:
•the formulation of lung pathology diagnosis;
•important studies concerning human physiology;
•the collection of important information in sport medicine.
No responsibility attaches COSMED Srl for any accident happened after a wrong use of
the device, such as:
•use by non qualified people;
•non respect of the device intended use;
•non respect of the hereunder reported precautions and instructions.
Warnings
The device, the programme algorithms and the presentation of measured data have been
developed according to the specifications of ATS (American Thoracic Society) and
ERS (European Respiratory Society). Other international references have been followed
when these were not available. All bibliography references are reported in Appendix.
The present handbook has been developed with respect of the European Medical Device
Directive requirements which sort K4 b2within Class II a.
It is recommended to read carefully the following precautions before putting the device
into operation.
The precautions reported below are of fundamental importance to assure the safety of
all COSMED equipment users.
1. This user manual is to be considered as a part of the medical device and should
always be kept on hand.
2. Safety, measure accuracy and precision can be assured only:
•using the accessories described in the manual or given with the device. Actually
non recommended accessories can affect safety unfavourable. Before using non
recommended accessories it is necessary to get in touch with the manufacturer;
•ordinary equipment maintenance, inspections, disinfection and cleaning are
performed in the way and with the frequency described;
•any modification or fixing is carried out by qualified personnel;
•the environmental conditions and the electrical plants where the device operates
are in compliance with the specifications of the manual and the present regulations
concerning electrical plants. In particular grounding reliability and leakage current
suppression can only be assured when the device three –wire receptacle is
connected to a yellow -green return connected to earth ground. Attempting to
defeat the proper connection of the ground wire is dangerous for users and
equipment.

Chapter 1 -Getting started -15
3. Before powering the system, check the power cables and the plugs. Damaged
electrical parts must be replaced immediately by authorised personnel.
4. Large gas cylinders, which may be given by the manufacturer or purchased by the
customer, should be secured with cylinder safety chains or safety stands.
5. When removing the protective cap, inspect the cylinder valve for damaged threads,
dirt, oil or grease. Remove any dust or dirt with a clean cloth. If oil or grease is
present on the valve of a cylinder which contains oxygen, do not attempt to use.
Such combustible substances in contact with oxygen are explosive.
6. Be certain that the materials of the pressure regulators are chemically compatible
with the intended gas service before installation. Inspect the regulator for the proper
connection and note the ranges of the pressure gauges. Also examine the physical
condition of the regulator including threads and fittings. Remove any dust or dirt
from the regulator or cylinder valve with a clean cloth. Do not install a regulator on
a cylinder valve containing oxygen if grease or oil is present on either. Such
substances in contact with oxygen are explosive.
7. Cleaning residue, particulates, and other contaminates (including pieces of torn or
broken components) in the breathing circuit pose a safety risk to the patient during
testing procedures. Aspiration of contaminates can potentially be life-threatening.
Use disposable anti-bacterial filters or disinfect each part in contact with the patient
before each test.
8. You must follow all the cleaning procedures in System Maintenance, and you must
thoroughly inspect the components after cleaning and before each patient test.
9. This device is not suitable for use in presence of flammable anaesthetics. It is not
an AP nor an APG device (according to the EN 60 601-1 definitions).
10. Keep the device away from heat and flame source, flammable or inflammable
liquids or gases and explosive atmospheres.
11. In accordance with their intended use K4 b2is not to be handled together with other
medical devices unless it is clearly declared by the manufacturer itself.
12. It is recommended to use a computer with electromagnetic compatibility CE
marking and with low radiation emission displays.
13. It is necessary to make the PC, connected to the K4 b2, compliant with EN 60601-1
by means of an isolation transformer.
14. Graphical symbols used in accordance to present specifications are described here
below:
Equipment type B (EN60601-1)
Equipment type BF (EN60601-1)
Danger: high temperature
OFF
ON
Protective earth ground
Alternating current

16 -K4 b2User Manual
Contraindication
The physical strain to execute the respiratory manoeuvre is contraindicated in case of
some symptoms or pathology. The following list is not complete and must be
considered as a piece of mere information.
Contraindications for the Spirometer tests
Absolute contraindications
For FVC, VC and MVV tests:
•Post-operating state from thoracic surgery
For FVC tests:
•Severe instability of the airways (such as a destructive bronchial emphysema)
•Bronchial non-specific marked hypersensitivity
•Serious problems for the gas exchange (total or partial respiratory insufficiency)
Relative contraindications
For FVC tests:
•spontaneous post-pneumothorax state
•arterial-venous aneurysm
•strong arterial hypertension
•pregnancy with complications at the 3rd month.
For MVV test:
•hyperventilation syndrome
Contraindications for Bronchial provocation tests
The bronchial provocation tests must be executed according to the doctor’s discretion.
There are not data that reveal specific contraindication for the bronchial provocation test
through inhalation.
The modern standard processes have been revealing secure in several clinical studies.
However it is recommendable to respect the following contraindications:
Absolute contraindications
•Serious bronchial obstruction (FEV1 in adults)
•Recent myocardium infarct
•Recent vascular-cerebral accident
•Known arterial aneurysm
•Incapacity for understanding the provocation test procedures and its implications.
Relative contraindications
•Bronchial obstruction caused by the respiratory manoeuvre.
•Moderate or serious bronchial obstruction. For ex. FEV1 < 1.51 in men and FEV1
in women < than 1.21.
•Recent infection in the superior air tracts
•During the asthmatic re-acuting
•Hypertension
•Pregnancy
•A pharmacology treatment epilepsy
Contraindications for Exercise testing
Read carefully the exercise testing chapter.

Chapter 1 -Getting started -17
Environmental condition of use
COSMED units have been conceived for operating in medically utilised rooms without
potential explosion hazards.
The units should not be installed in vicinity of x-ray equipment, motors or transformers
with high installed power rating since electric or magnetic interferences may falsify the
result of measurements or make them impossible. Due to this the vicinity of power lines
is to be avoided as well.
Cosmed equipment are not AP not APG devices (according to EN 60601-1): they are
not suitable for use in presence of flammable anaesthetic mixtures with air, oxygen or
nitrogen protoxide.
If not otherwise stated in the shipping documents, Cosmed equipment have been
conceived for operating under normal environmental temperatures and conditions [IEC
601-1(1988)/EN 60 601-1 (1990)].
•Temperature range 10°C (50°F) and 40°C (104°F).
•Relative humidity range 20% to 80%
•Atmospheric Pressure range 700 to 1060 mBar
•Avoid to use it in presence of noxious fumes or dusty environment and near heat
sources.
•Do not place near heat sources.
•Cardiopulmonary resuscitation emergency equipment accessible.
•Adequate floor space to assure access to the patient during exercise testing.
•Adequate ventilation in the room.

18 -K4 b2User Manual
Safety and conformity
Safety
IEC 601-1 (1988) /EN 60 601-1 (1990);
Find reported below the complete classification of the device:
•Class I type B device
•Protection against water penetration: IP00, ordinary equipment unprotected against
water penetration
•Non sterile device
•Device not suitable in the presence of flammable anaesthetics;
•Continuous functioning equipment;
EMC
The system meets the EMC Directive 89/336
EN 60601-1-2
EN 55011 Class B (emission), IEC 1000-4-2, IEC 1000-4-3, IEC 1000-4-4
Telemetry
I-ETS 300 220, CEPT T/R 01-04
pr ETS RES 0908 (CE type conformity)
Transmission frequency and output power can be changed upon request according to the
destination country requirements.
Quality Assurance
UNI EN ISO 9001:2000 (Registration n° 387-A Cermet)
Medical Device Directive (CE mark)
MDD 93/42/EEC (Notified Body 0476).
Class IIa
FCC (only USA version)
FCC ID: SN7-K4B2T-USA (transmitter)
FCC ID: SN7-K4B2R-USA (receiver)
This device complies with Part 15 of the FCC Rules. Operation is subject to the
following two conditions: (1) this device may not cause harmful interference, and (2)
this device must accept any interference received, including interference that may cause
undesired operation.
Changes or modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.

Chapter 1 -Getting started -19
Keynotes
Here are the keynotes used to make the manual easier to read.
Typographic keynotes
These are the typographic keynotes used in the manual.
Style Description
Bold indicates a control or a key to be pressed.
“Italic”indicates a messages shown by the firmware.
Graphic keynotes
These are the graphic keynotes used in the manual.
Illustration Description
shows the button to click in the software to activate the related feature.

20 -K4 b2User Manual
System overview
Portable Unit (PU)
It is fixed to the patient during the test by an anatomic
harness. The PU contains the O2and CO2analyzers, sampling
pump, UHF transmitter, barometric sensors and electronics. It
is powered by the rechargeable battery fixed to the back side
of the harness.
K4 b² is also provided with a small display, the PU shows in
real time the following parameters: VT, VE, VO2, VCO2, R,
HR, Rf Marker, battery charge level, temperature and
barometric pressure.
USA and Japan versions have the antenna not detachable from
the portable unit.
Besides data processing and presentation, the Portable Unit
has the following functions:
•Patient data input
•Environment data input (humidity)
•Gas and turbine calibration (automatic)
•Memory functions
•Tests data management
•Data loading to a PC (via RS232)
Telemetry Data Transmission, Receiver Unit (RU)
The RU consists of a small unit connected to a PC through the
RS 232 serial port. The transmission is achieved by a
miniaturized transmitter module located inside the Portable
Unit.
Battery Charger Unit (CU)
The CU allows the simultaneously charge of the 3 Ni-Cd
batteries and to supply the PU during the warm up time.