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VT Plus HF 
Operators Manual 

1-4 

 

Oxygen Measurements 

The oxygen measurement is performed using a galvanic oxygen cell on the high-flow 
port near the exhaust.

 

The 

VT PLUS HF

 interprets the measurement from the oxygen 

sensor as a partial pressure of the total pressure in the high-flow circuit.

 

The total 

pressure is the airway pressure plus the barometric pressure.

 

 

The oxygen percentage is calculated as the fraction of the partial pressure of oxygen 
relative to the total pressure.

 

It should be noted that changes in the total pressure (i.e. 

airway pressure) will result in a change in the partial pressure of the measured oxygen 
even though the percentage of oxygen is the same.

 

Since the pressure can change much 

faster than the response time of the oxygen sensor, a small transient (1 to 2% of full-
scale) error can occur in the oxygen measurement when there is a fast change in the 
pressure at the oxygen sensor. 

Whenever an oxygen measurement is made, or when the oxygen sensor is calibrated or 
zeroed, there should be sufficient gas flow pass the oxygen sensor.

 

Only a small flow of 

gas (say, 10 LPM)

 

is needed to ensure that the oxygen concentration at the oxygen sensor 

is as expected.

 

For example, just opening the high-flow exhaust to room air does not 

ensure that the oxygen sensor will "see" 20.9% oxygen.

 

The oxygen concentration at the 

sensor will not equilibrate with the room air unless a small amount of flow is present to 
ensure gas mixing. 

The oxygen sensor should last for more than one year, and is replaced during an annual 
calibration of the unit. Sensor life is shortened, the longer the sensor is exposed to 
oxygen. This includes oxygen in room air as well as higher flow rates of oxygen-
containing gases past the sensor. 

 

The 

VT PLUS HF

 will check to detect if the oxygen 

sensor is depleted every time an oxygen zero is performed. 

The oxygen sensor should be recalibrated by the user with 100% oxygen and dry air at 
the beginning of any testing day in which oxygen concentrations will be measured.

 

Refer 

to 

Chapter 7, Safety, Error Messages, Troubleshooting, and Support 

for more details. 

Flow Measurements 

The flow measurements in the 

VT PLUS HF

 are made by measuring the differential 

pressure across a resistive screen mesh.

 

The resulting differential pressure is nearly linear 

with respect to the volumetric flow.

 

Simple corrections are applied to correct for any non-

linearities.

 

A table of correction factors is applied for each the low- and high-flow 

sensors.

 

The information regarding these tables can be seen using the 

SETUP | UTILITES 

| LINEARIZATION

 screen on the 

VT PLUS HF

. 

Gas Settings

: The flow measurement sensors in the 

VT PLUS HF

 are linearly dependent 

on the viscosity of the applied gas.

 

 The 

VT PLUS HF

 setup options allow the user to 

specify what type of gas is being used.

 

Additional choices are available using the USER 

DEFINE MODE.

 

The USER DEFINED gas settings are set using the PC software.

 

The 

gas calculator on the PC software can determine the effective viscosity for a combination 
of various gases.

 

Refer to 

Chapter 8, VT Plus PC Software

 for more details on the gas 

calculator and on setting user defined gas types. 

The 

VT PLUS HF

 calculates the temperature dependent viscosity for the gas type selected 

(except for user-defined gases).

 

Therefore, when a new flowing gas temperature is 

Содержание VT Plus HF

Страница 1: ...VT Plus HF Gas Flow Analyzer Operators Manual PN 2137275 May 2005 2005 Fluke Corporation All rights reserved Printed in USA All product names are trademarks of their respective companies ...

Страница 2: ......

Страница 3: ...oftware or equipment that is not supplied by Fluke Biomedical or its affiliated dealers Claims Our routine method of shipment is via common carrier FOB origin Upon delivery if physical damage is found retain all packing materials in their original condition and contact the carrier immediately to file a claim If the instrument is delivered in good physical condition but does not operate within spec...

Страница 4: ...owing warning and informational symbols may be found on the VT PLUS HF Symbol Description Alternating current Caution refer to accompanying documentation Off power disconnection from mains On power connection to mains Caution risk of electric shock Direct alternating current Direct current Protective earth ground Inspect the lead ends for possible wear cracks or breaks before each use If operating...

Страница 5: ... hazard Do not operate the instrument if internal components are exposed to fluid Precautions The following precautions are provided to help you avoid damaging the system Caution Service Authorized service personnel should service the VT PLUS HF Only qualified technical personnel should perform troubleshooting and service procedures on internal components Caution Environmental Conditions Do not ex...

Страница 6: ...SA UL 3101 1 Electrical Equipment for Laboratory Use Part 1 General Requirements Canada CAN CSA C22 2 No 1010 1 1992 Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use Part 1 General Requirements EC Directive 73 23 EEC EN 61010 1 Safety requirement for electrical equipment for measurement control and laboratory use Part 1 General Requirements ...

Страница 7: ... radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause interference in which case the user will be required to correct the interference at his her own expense Canadian Department of Communications Class A This digital apparatus does no...

Страница 8: ...or Immunity Verification of compliance was conducted to the limits and methods of the following EN 61000 4 2 1991 Electrostatic Discharge EN 61000 4 3 1995 Radiated EM Fields EN 61000 4 4 1995 Electrical Fast Transient Burst EN 61000 4 5 1995 Surge Immunity EN 61000 4 6 1996 Conducted Disturbances EN 61000 4 11 1994 Voltage Dips Short Interruptions and Variations EC Directive 73 23 EEC Low Voltage...

Страница 9: ...ce to province or country to country This warranty is limited to repairing the instrument to Fluke Biomedical s specifications Warranty Disclaimer Should you elect to have your instrument serviced and or calibrated by someone other than Fluke Biomedical please be advised that the original warranty covering your product becomes void when the tamper resistant Quality Seal is removed or broken withou...

Страница 10: ... 2 Pressure Measurements 1 2 Oxygen Measurements 1 4 Flow Measurements 1 4 Breath Detection 1 6 Calculated Parameters 1 8 About This Manual 1 9 2 Installation Unpacking and Inspection 2 1 Connecting the VT PLUS HF 2 2 Pneumatic Connections 2 2 Quick Installation Operations Guide 2 3 Bi directional Flow Mode 2 3 Uni directional Flow Mode 2 4 Inspiratory Testing 2 4 Expiratory Testing 2 4 Attaching ...

Страница 11: ...w Pressure Screen 5 9 Airway Pressure Screen 5 10 Volume Screen 5 11 Flow Zero 5 11 Oxygen Screen 5 12 Full Breath Parameters Test Screen 5 13 Monitor Screen 5 14 Units of Measure 5 15 6 Special Functions Trend Test 6 1 Leak Test 6 5 Stacked Volume Test 6 8 RT200 Emulation Mode 6 9 Assist Test 6 12 High Frequency Oscillator Mode 6 13 7 Safety Error Messages Troubleshooting and Support Electrical S...

Страница 12: ...cations 8 19 Selecting COM Port 8 19 Selecting the Serial Communications Mode 8 19 Data and File Handling 8 20 File Structure Background and Theory of Operation 8 20 Events 8 20 Opening and Closing Data Files 8 22 File Control Interface 8 23 Generating Signal sig Files 8 26 Generating Parameter par Files 8 26 Printing 8 27 Loading Flash Memory 8 27 Plots 8 28 Automatically Re scaling Plots 8 28 Ma...

Страница 13: ...y and expiratory pressures lung compliance etc Selectable Units The VT PLUS HF allows the user to select the desired units for each of the measured signals For example pressures can be displayed in mmHg kPa bar mbar atm inH2O inHg cmH2O or mmHg Leak Testing The VT PLUS HF allows the user to test the leak rate of a sealed vessel or test lung Trend Testing The VT PLUS HF provides an automated test t...

Страница 14: ... measurement capabilities There are two external pressure measurements available to the user There are also three more internal pressure measurements External Pressure Measurements These have been called Low Pressure and High Pressure The low pressure measurement has a range of 500 mmHg about 10 psi The high pressure measurement has a range of 100 psi about 5200 mmHg Both the high and low pressure...

Страница 15: ...is provided for the user to zero the offset drift Typically this is done when a non zero reading occurs when there is zero applied pressure However it is good practice to zero the respective signal before any measurement is taken Although a five minute warm up period is built into the VT PLUS HF power up cycle a 40 minute warm up period is suggested for maximum measurement accuracy and stability T...

Страница 16: ...nit Sensor life is shortened the longer the sensor is exposed to oxygen This includes oxygen in room air as well as higher flow rates of oxygen containing gases past the sensor The VT PLUS HF will check to detect if the oxygen sensor is depleted every time an oxygen zero is performed The oxygen sensor should be recalibrated by the user with 100 oxygen and dry air at the beginning of any testing da...

Страница 17: ... the measured barometric pressure The user sets the ambient temperature by using the setup menu It should be noted that the relative humidity setting on the VT PLUS HF is only used for the BTPS and STPD correction BTPS stands for Body Temperature and Pressure Saturated with water vapor In this compensation mode the flow rate and therefore volumes are corrected such that the reported flow is equal ...

Страница 18: ...ERO key to initiate a flow zero The valves will still automatically switch to obtain the zero reading Therefore it is not necessary for the user to disconnect the flow to zero No message will appear indicating that the flow source should be removed With the autozero setting enabled the flow will automatically zero every 20 minutes If more frequent zeroing is desired manually zero the flow using th...

Страница 19: ...mplemented differently on different ventilators This is also called by different names by the various ventilator manufactures It may be called base flow bias flow flow by blow by or many other names In the inspiratory or expiratory only breath detection modes the VT PLUS HF can measure the base flow present Refer to Chapter 2 Installation for circuit configurations for the different modes The dete...

Страница 20: ... Expiratory Time Inspiratory Hold Pressure IPP The average pressure during the End Inspiratory State Positive End Expiratory Pressure PEEP The average pressure during the End Expiratory State Mean Airway Pressure MAP The mean pressure over the entire breath Peak Inspiratory Pressure PIP The maximum pressure during the Inspiratory Time Tidal Volume Tidal Vol Total volume accumulated over the Inspir...

Страница 21: ...anized as follows Chapter 1 Overview An introduction to the VT PLUS HF and optional accessories Chapter 2 Installation How to set up the VT PLUS HF Chapter 3 Keypad Functions A description of VT PLUS HF keypad functions Chapter 4 System Setup An explanation of the VT PLUS HF settings and how to adjust them Chapter 5 Display Screens An explanation of the various screens on the VT PLUS HF and how to...

Страница 22: ...VT Plus HF Operators Manual 1 10 ...

Страница 23: ...ollowing checklist to ensure that you have received everything In addition to the tester and this manual you should have A power cable Fluke Biomedical Part Numbers US 2238562 Schuko 769422 UK 2238570 Australia 658641 An accessories kit containing the following items One bacterial filter for external connection to the flow ports P N 2133712 4 Tubing 1 8 ID clear w blue stripe P N 2391848 Two 22 mm...

Страница 24: ... 120 cmH2O Only dry gasses should be measured using the high flow port Do not use this port to measure exhaled or artificially humidified gasses Low Flow inlet and exhaust The outer diameter of the low flow ports is a standard 15 mm to allow connection with standard respiratory fittings such as gas sampling Y pieces and gas sampling adapters The inner lumen of the low flow ports are threaded to ac...

Страница 25: ...test lung You can choose either a bi directional flow mode or a uni directional flow mode as illustrated below however the bi directional mode is preferred Bi directional Flow Mode 1 Connect the ventilator using a Y piece adapter to the flow inlet port on the right of the VT PLUS HF 2 Connect the flow exhaust port on the left to the test lung using standard breathing hoses 3 Ensure that the breath...

Страница 26: ...Go into Setup b Choose Settings c Choose Breath Detect and modify as needed See Chapter 4 System Setup for more details Outlet Inlet Ventilator Inspiratory Hose Expiratory Hose TEST LUNG VT PLUS HF fig2 2 eps Figure 2 2 Connecting the VT PLUS HF to in either the inspiratory limb of the breathing circuit Expiratory Testing 1 Connect the expiratory hose to the flow port on the right side of the VT P...

Страница 27: ... Figure 2 3 Connecting the VT PLUS HF to in the expiratory limb of the breathing circuit See Chapter 6 Special Functions for more details The VT PLUS HF should display a screen similar to that shown in Figure 2 4 The flow of gas delivered by the ventilator is shown graphically on the screen Figure 2 4 VT PLUS HF flow display ...

Страница 28: ...ey below CLEAR to erase the plot and re initialize the statistics and breath parameters For more information in any screen press the HELP key Press PAUSE RESUME key to pause the screen Press the key again to resume the plot Refer to Chapter 5 Display Screens for a more detailed description of the various screens and modes 3 Attaching the Printer Cable The printer is set up for parallel printing Th...

Страница 29: ...YZER VT PLUS HF 3 Chapter 3 Keypad Functions 1 VT PLUS HF Keypad Functions Figure 3 1 illustrates the VT PLUS HF keypad The various keys and their functions are described on the following pages Figure 3 1 VT PLUS HF Front Panel 1 VT PLUS HF Keypad Functions Contrast Adjustment Pause Resume Soft Keys Help Print ...

Страница 30: ...F stops sampling the transducers while in the Pause mode Print This key will cause the VT PLUS HF to print the current data to the printer The mode and format of the printout is set using the printer options function selected under the setup menu Help The help key can be pressed in any screen A brief description of the screen and of the options available from that screen is provided when help is p...

Страница 31: ... is used to select the oxygen mode The oxygen mode displays the signal instantaneous numeric value and statistical data for the oxygen signal This key is also the 3 key for numeric data entry more 4 Key This key is used to select other tests such as the Leak test and the Trend test This key is also the 4 key for numeric data entry full 5 Key This key is used to select the full breath parameters mo...

Страница 32: ...or Zero Mode Descriptions This key is also the 7 key for numeric data entry setup 8 Key This key is used to access the VT PLUS HF configuration and setup screens When this key is pressed a menu is displayed The soft keys are used to navigate the menu From this menu other sub menus are accessible to adjust the various configuration settings The details of this menu and its sub menus will be describ...

Страница 33: ...tings screen contains a menu for choosing options that affect flow and measurement on the VT PLUS HF System screen contains a menu for choosing options that affect how information on the VT PLUS HF is set up such as time and date Utility screen is used for system service and calibration only Information screen contains product information about the VT PLUS HF such as serial number and copyright 1 ...

Страница 34: ...etc On the other hand when a numeric entry such as B D THRESHOLD is selected and MODIFY pressed it will clear the data entry and accept numeric input from the keypad until the ENTER key is pressed again Following is a detailed description of each of the settings Note Whatever option is displayed when the settings screen is exited will be saved and used for future measurements Gas Settings This set...

Страница 35: ...ir Standard room air N2 100 Nitrogen N2O 100 Nitrous Oxide CO2 100 Carbon Dioxide O2 100 Oxygen Heliox 30 Oxygen and 70 Helium blend N20 bal O2 Measured Oxygen balance Nitrous Oxide He bal O2 Measured Oxygen balance Oxygen Helium N2 bal O2 Measured Oxygen balance Nitrogen User Defined User selects custom gas mixture This option requires the VT Plus PC software Note For BALANCE gas settings the oxy...

Страница 36: ... soft key Note that the VT PLUS HF accepts temperatures between 0 and 99 C No decimal values or fractions of a degree are allowed Ambient Temperature This setting is the room temperature air flowing through the high or low flow ports To change ambient temperature follow these steps 1 Use the and or soft key to highlight the line labeled AMBIENT TEMP 2 Press the MODIFY soft key 3 Use the numeric ke...

Страница 37: ...o highlight CORRECTION MODE 3 Press the MODIFY soft key until the desired option is displayed 4 Press the BACK soft key to exit to the setup menu Barometric Pressure Units These settings represent the various units available to measure barometric pressure such as mmHg To change the barometric pressure units follow these steps 1 Enter the settings screen from the setup menu 2 Use the and or soft ke...

Страница 38: ... piece in the breathing circuit Uni directional inspired only Use this breath detection mode when the VT PLUS HF is analyzing only inspired breaths or when the VT PLUS HF is connected in the inspired limb of the ventilator breathing circuit Uni directional expired only Use this breath detection mode when the VT PLUS HF is analyzing only expired breaths or when the VT PLUS HF is connected in the ex...

Страница 39: ...the setup menu 2 Use the and or soft key to highlight the line labeled BI DIR TIDAL VOL 3 Press the MODIFY soft key until the desired option is displayed 4 Press the BACK soft key to exit back to the setup menu options Zero Mode All of the pressure and differential pressure flow sensors in the VT PLUS HF need to be periodically zeroed or calibrated to a zero reference This zero function can be set...

Страница 40: ...on such as LOW OFF etc On the other hand when a numeric entry such as TIME is selected and MODIFY is pressed it will clear the data entry and accept numeric input from the keypad until the ENTER key is pressed Following is a detailed description of each of the settings Note Whatever option is displayed when the systems screen is exited will be saved and used for future measurements Time The VT PLU...

Страница 41: ...lowing information MM is the number between 1 and 12 corresponding to the month DD is the number between 1 and 31 corresponding to the day of the month YYYY is the year To enter the date follow these steps 1 Enter the system screen from the setup menu 2 Use the and or soft key to highlight the line labeled DATE 3 Press the MODIFY soft key 4 Use the numeric keys to enter the date in the format chos...

Страница 42: ...on or off as desired 4 Press the BACK soft key to return to menu options Filtering This setting is used to adjust the transition of signals on the flow meters The filter has four settings soft medium hard and off Note When filtering is on full test parameters are invalid To change this option follow these steps 1 Enter the system screen from the setup menu 2 Use the and or soft key to highlight th...

Страница 43: ...L MODE 3 Press the MODIFY soft key until the desired option is displayed 4 Press the BACK soft key to return to menu options Printer Options This setting allows you to choose the format in which to print your information The VT PLUS HF can be connected to various printers The following printer languages are supported HP PCL 3 graphics text or text only Epson P1 graphics text or text only ASCII pri...

Страница 44: ...e the type of reports shown follow these steps 1 Use the and or soft key to highlight the line labeled GRAPHICS 2 Press the MODIFY soft key until the desired option is displayed 3 Press BACK to return to menu options Audio Levels This adjusts the level of sound for the functions of the VT PLUS HF To adjust the sound follow these steps 1 Enter the system screen from the setup menu 2 Use the and or ...

Страница 45: ...that beep To adjust the sound level of the keypad follow these steps 1 Use the and or soft key to highlight the line labeled KEYPAD 2 Press the MODIFY soft key until the desired option is displayed 3 Press BACK to return to menu options Error When an error is made the VT PLUS HF signals it with a beep This option adjusts the sound level of that beep To adjust the sound level of errors follow these...

Страница 46: ...ns Factory Defaults System Date Format MM DD YYYY Demo Data Off Filtering None Display Cal Date Yes Serial Mode None Printer Options Printer Type None Graphics Text Only Audio Levels General Low Keypad Low Errors Low Settings Gas Settings Gas Type Air Gas Temperature 22 C Ambient Temperature 22 C Rel Humidity 33 C Correction Mode ATP Baro Press Units mmHg Barometric Pressure actual measurement in ...

Страница 47: ...ecked All others de selected un checked 4 Utilities These settings are required for servicing the operations of the VT PLUS HF This information is for service personnel involved in the technical repair of the VT PLUS HF Oxygen Calibration Select OXYGEN CALIBRATION to calibrate the oxygen sensor Refer to Chapter 7 for details on oxygen calibration System Diagnostics These functions are for the serv...

Страница 48: ...ata is still valid 1 Enter the settings screen from the setup menu 2 Use the and or soft key to highlight the line labeled LINEARIZATION 3 Press the ENTER soft key 4 Press BACK to return to menu options Unlock Calibration These functions are for the service personnel to utilize during the technical repair of the VT PLUS HF 5 Information This setting gives the product information on the VT PLUS HF ...

Страница 49: ...nd selected breath parameters The following is a description of the meaning and function of each of these screen options 1 Screen Objects 2 Selecting Parameters 3 Flow Screens 4 Pressure Screens 5 Volume Screen 6 Oxygen Screen 7 Full Breath Parameters Test Screen 8 Monitor Screen 9 Units of Measure Icons Data Plots Instantaneous Numeric Data Statistics Parameters Title Bar ...

Страница 50: ...d in the inspired limb of the ventilator breathing circuit ATP This indicates the conversion of gas flow and volume to ambient temperature and pressure BTPS This indicates the conversion of gas flow and volume to body temperature of 37 C with 100 relative humidity STPD0 This indicates the conversion of gas flow and volume to a standard temperature of 0 C and a standard barometric pressure of 760 m...

Страница 51: ...t These values are calculated continually until a new screen is selected or until the soft key labeled CLEAR is pressed DATA PLOTS Each of the screens except the FULL screen includes a data plot Each of these plots shows a measured signal flow pressure volume or O2 vs time New data is added to the plot starting on the left and progressing to the right When the plot has progressed to the right edge...

Страница 52: ... possible units The selected units of measure will remain even though the mode has been changed or when the VT PLUS HF has been turned off The selected gas type appears in the area below the UNITS key PARAMETERS Every screen can display up to four breath parameters These parameters are only displayed if breath detection has been enabled See Chapter 6 Special Functions for instructions on how to en...

Страница 53: ...ve only four parameters can be viewed for each screen An existing parameter must be removed before a new parameter can be added Press the soft key labeled ENTER to remove the parameter The X in the box adjacent to that parameter will be removed indicating the parameter has been deselected 4 Use the soft keys labeled and to highlight the parameter you wish to add Press the soft key labeled ENTER to...

Страница 54: ...te CFM Cubic feet per minute LPS Liters per second ml min Milliliters per minute ml sec Milliliters per second Re scale Press the soft key below RESCALE to change the scale on the plot of data to a more appropriate window of values Note RESCALE uses the current Min Max values to determine plot limits Clear Press the soft key below CLEAR to reset the statistics and re start the plot The user can se...

Страница 55: ...his screen include LPM Liters per minute CFM Cubic feet per minute LPS Liters per second ml min Milliliters per minute ml sec Milliliters per second Re scale Press the soft key below RESCALE to change the scale on the plot of data to a more appropriate window of values Note RESCALE uses the current Min Max values to determine plot limits Clear Press the soft key below CLEAR to reset the statistics...

Страница 56: ...reen include mbar millibar 001 Bar bar 14 7 PSIG Barometric mmHg millimeters of mercury inHg inches of mercury cmH2O centimeters of water inH2O inches of water PSIG pounds per square inch atm atmospheres kPa kilopascals Re scale Press the soft key below RESCALE to change the scale on the plot of data to a more appropriate window of values Note RESCALE uses the current Min Max values to determine p...

Страница 57: ...r millibar 001 BAR bar 14 7 PSIG Barometric mmHg millimeters of mercury inHg inches of mercury cmH2O centimeters of water inH2O inches of water PSIG pounds per square inch atm atmospheres kPa kilopascals Re scale Press the soft key below RESCALE to change the scale on the plot of data to a more appropriate window of values Note RESCALE uses the current Min Max values to determine plot limits Clear...

Страница 58: ...he units of measure for the airway pressure screen Possible units of measure for this screen include mbar millibar 001 BAR bar 14 7 PSIG Barometric mmHg millimeters of mercury inHg inches of mercury cmH2O centimeters of water inH2O inches of water PSIG pounds per square inch atm atmospheres kPa kilopascals Re scale Press the soft key below RESCALE to change the scale on the plot of data to a more ...

Страница 59: ...e on the plot of data to a more appropriate window of values Note RESCALE uses the current Min Max values to determine plot limits Clear Press the soft key below CLEAR to reset the statistics and re start the plot The user can select the breath parameters displayed in this screen Follow the instructions on page 5 5 to select which breath parameters are displayed in this screen Note The volume sign...

Страница 60: ...h the high flow port also to measure oxygen Re scale Press the soft key below RESCALE to change the scale on the plot of data to a more appropriate window of values Clear Press the soft key below CLEAR to reset the statistics and re start the plot The user can select the breath parameters displayed in this screen Follow the instructions on page 5 5 to select which breath parameters are displayed i...

Страница 61: ...tics and re start the plot When an asterisk appears for a parameter value the parameter is either invalid for the current breath detect mode or the system does not have sufficient information to accurately calculate the parameter For example base flow is invalid during bi directional breath detection mode since the base flow is only seen in the inspiratory and expiratory limbs of the ventilator ci...

Страница 62: ...Press the soft key below ASSIGN to change which signal will be plotted in the selected position Four breath parameters can be displayed in place of a signal plot in the lowest position As described on page 5 5 of this chapter the user can select the parameters displayed in this screen Units Press the soft key below UNITS to change the units of the signal and the units of the instantaneous value fo...

Страница 63: ...Inches of water inHg Inches of mercury cmH20 Centimeters of water mmHg Millimeters of mercury Volume l Liters F3 Cubic Feet ml Milliliters The VT PLUS HF has the following conversion factors for gas volume and flow measurements ATP conversion for gas flow and volume to ambient temperature and pressure STPD0 conversion for gas flow and volume to a standard temperature of 0 C and a standard barometr...

Страница 64: ...VT Plus HF Operators Manual 5 16 ...

Страница 65: ...nt variation from the initial measured value There are two ways to access the trend screen 1 Press the FULL 5 key to display the breath parameters 2 Press the soft key below TREND Or 1 Press the MORE 4 key 2 Use the and soft keys to highlight TREND TEST 3 Press the soft key below ENTER After selecting TREND TEST the TREND TEST setup screen is displayed Trend Test Leak Test Stacked Volume Test RT20...

Страница 66: ...ed in Use the and soft keys to highlight USE PRINTER Press the soft key below MODIFY If YES is selected for printer a report of all the breath parameters with time date stamp will print every time an incident occurs Before starting the test ensure that the ventilator is on and that steady state conditions are reached Monitor the CURRENT VALUE displayed to ensure that the breath parameter is as exp...

Страница 67: ...Gas Flow Analyzer 6 6 3 To terminate the test press the soft key below STOP After the trend test is ended the following report screen is shown A sample Trend Test Report is shown on the following page ...

Страница 68: ...VT Plus HF Operators Manual 6 4 TREND TEST REPORT ...

Страница 69: ...eak test setup screen to select the leak test parameters To select which pressure channel will be used for the leak test press the soft keys below and until PRESSURE CHANNEL is highlighted Press the soft key below MODIFY until the desired pressure channel is selected Note When AIRWAY is selected the airway transducer will be connected to the currently selected flow channel Both flow channels can b...

Страница 70: ...nter a time of 1 09 05 press the following sequence of keys 0 1 0 9 0 5 After all of the test parameters have been pressurize the test chamber test lung and press the soft key below START A screen similar to the one shown will be displayed The display shows a pressure plot and instantaneous pressure valued to the right of the plot Parameters below the pressure plot show the entered compliance the ...

Страница 71: ...Gas Flow Analyzer 6 6 7 LEAK TEST REPORT Fluke Biomedical Corporation ...

Страница 72: ...the test Total Volume This indicates the total volume of all breaths together Last Volume This indicates the volume of the last breath taken Avg Volume This inidicates the average volume of all breaths taken Num of Breaths This indicates the total number of breaths taken Total Breaths This indicates the total number of breaths to be taken 7 When the test is complete press the EXIT soft key Press t...

Страница 73: ...T200 Emulation mode follow these steps 1 Press the MORE 4 key 2 Use the and soft keys to highlight RT200 EMULATION MODE 3 Press the soft key below ENTER OR 1 Press the SETUP key 2 Use the and soft keys to highlight SYSTEM 3 Press the soft key below ENTER 4 Use the and soft keys to highlight SERIAL MODE 5 Press the MODIFY soft key until RT200 is displayed 6 Press the BACK soft key to return to setu...

Страница 74: ...lied Healthcare Products Inc For the format of the serial commands the user should refer to the document Serial Interface for the RT200 Calibration Analyzer System Operation Manual from Allied Healthcare Products Inc The RT200 Functions supported by the VT PLUS HF are listed below Command Description F09 Reset F11 Low Pressure Measurement 20 cmH2O F12 Low Pressure Measurement 250 cmH2O F13 Low Pre...

Страница 75: ...with that RT200 function The menu is function sensitive and the options in the menu correlate to the RT200 s special functions 00 01 F1 and F2 The values you may set in this menu include Oxygen Concentration Accumulated Tidal Volumes Correction Mode Hold Times Ambient Temperature Barometric Pressure Rise Delay Time Fall Delay Time and Trigger Level The SETUP RS232 soft key brings up a screen for s...

Страница 76: ...he FULL TEST screen 2 Connect the ventilator breathing circuit with the VT PLUS HF in the bi directional measurement configuration Outlet Inlet Ventilator Inspiratory Hose Expiratory Hose VT PLUS HF TEST LUNG fig2 1 eps Figure 6 2 Ventilator Breathing Circuit setup for Bi directional measurements 3 Adjust the ventilator controls so that an effort negative pressure at the lung during the expiration...

Страница 77: ...or Mode The VT PLUS HF has a function for testing high frequency flow and airway pressure To access the high frequency oscillator function follow these steps 1 Press the MORE 4 key 2 Use the and soft keys to highlight HIGH FREQUENCY OSCILLATOR 3 Press the soft key below ENTER The high frequency oscillator mode samples flow and airway pressure at a much faster rate 5x than the VT PLUS HF does in no...

Страница 78: ...e HFO test once press the START soft key The AUTO soft key will start the HFO test in automatic mode In automatic mode the HFO test is run every 15 seconds When in automatic mode press the STOP soft key to end the high frequency oscillator test ...

Страница 79: ...r a hazardous condition may result Warning Hazardous Voltages Present For safety purposes and to avoid damaging the instrument you must turn off the VT PLUS HF and disconnect its power cord BEFORE opening the case or performing other service procedures described in this chapter Cleaning The system is to be cleaned with a damp cloth on the exterior only A solution of 70 isopropyl alcohol may be use...

Страница 80: ...bout one inch in diameter with wires protruding from the back of the sensor 2 Disconnect the in line electrical connector on the sensor wire 3 Un screw the old sensor and remove it 4 Screw in the new sensor Fluke Biomedical P N 2138514 5 Re connect the sensor wire 6 Replace the oxygen sensor door 7 Re calibrate the oxygen sensor following the instructions below 3 Procedure for Calibrating the Oxyg...

Страница 81: ...Do not press SKIP 9 Verify that the O2 reading is 100 0 1 4 Replacing the Fuses The VT PLUS HF s fuse compartment is located on the side panel of the instrument Figure 7 1 The VT PLUS HF Fuse Compartment To change the fuses 1 Turn the VT PLUS HF off and unplug the main power cord 2 Using a small flat blade screwdriver or similar tool carefully pry off the cover to the fuse compartment The fuse blo...

Страница 82: ...way pressure measurement causes a measurement greater than the maximum or less than the minimum reading of the analog to digital converter CORRECTIVE ACTION Ensure that pressure is within the specified range of the VT PLUS HF Low Pressure Out of Range Occurs if low pressure measurement causes a measurement greater than the maximum or less than the minimum reading of the analog to digital converter...

Страница 83: ...onal breath detect mode AD Buffer Overrun Occurs when the VT PLUS HF can not keep up with the data input The VT PLUS HF can buffer a few seconds of data when it is busy changing screens and such CORRECTIVE ACTION If the error message appears several times during normal monitoring i e no keys are being pushed call factory for service Zero Time Out Occurs when a flow zero isn t complete after 150 at...

Страница 84: ...er language support Ensure the printer cable is correctly installed Printer Busy Occurs when printer s busy line is set CORRECTIVE ACTION Ensure that the printer is selected refer to printer s user manual Ensure the correct printer type is selected Refer to your printer s user manual to ensure the printer is setup correctly for the printer language set on the VT PLUS HF i e HP PCL 3 Note your prin...

Страница 85: ...ed in incorrect checksum If problem persists call Service Screen contrast not set Adjust screen contrast using multiple pushes of the contrast key on the side of the VT PLUS HF display Screen is difficult to read Screen contrast not set Adjust screen contrast using multiple pushes of the contrast key on the side of the VT PLUS HF display Flicker is observed on left side of VT PLUS HF screen Slight...

Страница 86: ...ly zero Zero the flow reading Consider using the auto zero mode VT PLUS HF is out of calibration If possible verify calibration with a 3 liter calibration syringe Ensure gas settings are correct With the VT PLUS HF in the bi directional breath detect mode and the gas correction mode set to ATP stroke syringe such that flows are near the mid range for the flow sensor Compare the VT PLUS HF tidal vo...

Страница 87: ...te the expected volume loss due to compressibility of the gas and expansion of the hose The VT PLUS HF is used with humidified gases Condensation on the flow sensors causes a calibration error on the flow measurement Run DRY air through the flow sensor for 10 to 30 minutes to allow the screen mesh to dry Do not use the VT PLUS HF with condensing humidified gases Invalid parameters exist in expirat...

Страница 88: ...em will not zero flow No message appears Autozeroing mode is enabled VT PLUS HF is zeroing flow but no message is supposed to be displayed since the VT PLUS HF uses valves to switch to the unused flow port This is normal Since the autozero mode is enabled the VT PLUS HF assumes that the unused flow sensor can be used to obtain the zero reading Ensure the unused flow sensor has zero flow when the a...

Страница 89: ...hose from the ventilator In bi directional mode this means the inlet is near to the Y piece VT PLUS HF does not print Wrong printer type selected Select correct printer type on the VT PLUS HF Printer not setup for selected printer language Review printer s user manual to determine how to setup printer t work with the selected VT PLUS HF printer mode Printer not connected Connect printer VT PLUS HF...

Страница 90: ... 775 883 3400 If repairs are required you will be informed of the location the VT PLUS HF should be shipped 1 Pack the instrument carefully Failure to pack the instrument properly could void your warranty 2 Enclose the following information VT PLUS HF serial number The specific steps which reproduce your problem A daytime phone number Your name company A fax number if available RMA number received...

Страница 91: ...andard 9 pin serial cable to connect to a PC Simply plug a serial cable into the RS232 port on the back of the VT PLUS HF and into an unused serial com port on your PC When the VT Plus PC software is launched the VT PLUS HF is automatically placed into the computer control mode No graphics are available on the VT PLUS HF screen while serial communications are active A screen will be displayed on t...

Страница 92: ...where to put the icons for the VT Plus for Windows program Simply follow the instructions given by the installation program If no changes are made to the default installation options VT Plus for Windows will be installed to C Program Files VTPlus and the shortcuts to the program will be in the VT Plus group Starting the Software With the software installed and the VT PLUS HF connected you are read...

Страница 93: ... and the displayed values for flow and pressure are changing 2 Overview of VT Plus for Windows Software Purpose and Intended Use VT Plus for Windows provides a simple interface for recording and playing back data calculated by the VT PLUS HF Most functions on the VT PLUS HF are available using VT Plus for Windows Using VT Plus for Windows VT Plus for Windows provides a simple interface for recordi...

Страница 94: ...VT Plus HF Operators Manual 8 4 1 Menu 2 Tool Bar 3 Statistics Area 4 Plot Area 5 Screen Tabs 6 Status Bar 7 Selected Flow Port 8 Correction Mode 9 Zeroing Mode 10 Selected File System Messages ...

Страница 95: ...see the Serial Communications section in this chapter Plots The plot menu provides access to the plot re scaling functions It allows you to change the plot on any of the monitors and turn on or off the automatic re scaling For a complete description see the Plots section in this chapter Statistics The statistics menu gives access to the clear function for any or all statistics The CLEAR ALL functi...

Страница 96: ...the breath detect threshold for the current flow port Gas Settings The gas settings function brings up the GAS SETTINGS dialog box See the Gas Settings section later in this chapter Barometric Pressure This function brings up the barometric pressure dialog box Enter the local barometric pressure in mmHg and click OK to calibrate the barometric pressure sensor Signal Units The signal units function...

Страница 97: ... up the file controls dialog For more information see the Data and File Handling section Print button This button gives you quick access to the print functions Click this and the printer dialog appears Zeroing button This button forces the VT PLUS HF unit to zero immediately For more information see the Zeroing section Clear Statistic button This button forces the VT PLUS HF to clear a selected st...

Страница 98: ...splay any of the signals flow volume airway pressure low pressure high pressure and oxygen Each plot can be independently set to auto scale or manually re scaled to the user s desired range of values On the right hand side of the screen the statistics for the selected signals are displayed These statistics show the min max average and current value for the signal that is currently displayed For mo...

Страница 99: ...oxygen This plot can be set to auto scale or it can be manually re scaled to the user s desired range of values On the right hand side of the screen the statistics for the selected signal are displayed These statistics show the min max average and current value for the signal that is currently displayed For more information on configuring plots refer to Signal Selection Automatic Re scaling or Man...

Страница 100: ...e used to control the appearance of the loop plots Clear Volume Allows you to zero the volume when the breath detect has been turned off Clear Plots Clears both of the loop plots Clear Both Performs both the Clear Volume and the Clear Plot functions Number of Loops This control allows you to specify the number of breaths that are drawn before the plots are cleared One to four breaths may be drawn ...

Страница 101: ...displays the calculated parameters for the last breath These parameters are only updated when a new breath occurs A value means that value is invalid or could not be calculated Depending on your breath detect mode some parameters can t be calculated Figure 8 6 Full Test screen ...

Страница 102: ...eported to the user every time a breath occurs Test Parameter This is the parameter that was chosen for running this test This value will not change during the test Current Value This is the current value of the chosen test parameter Every time a breath occurs this is updated and compared against the initial value of the test parameter Starting Value Shows the initial value for the test parameter ...

Страница 103: ...Gas Flow Analyzer VT Plus PC Software 8 8 13 Figure 8 7A Trend Test screen Figure 8 7B Trend Test screen ...

Страница 104: ...VT Plus HF Operators Manual 8 14 Figure 8 7C Trend Test screen ...

Страница 105: ...calculated during the test Test Parameter This is the parameter that was chosen for running this test This value will not change during the test Compliance This is the compliance value entered when starting the leak test This value doesn t change during a leak test Initial Pressure This is the pressure read on the selected pressure channel when the leak test was started The initial value doesn t c...

Страница 106: ...VT Plus HF Operators Manual 8 16 Figure 8 8A Leak Test screen Figure 8 8B Leak Test screen ...

Страница 107: ...e a breath is detected Total Volume This value reflects the total of the tidal volumes for the breaths tested Last Volume The tidal volume for the last breath is displayed here Average Volume The average tidal volume over the breaths that have been tested is calculated and displayed here Number of Breaths This is the number entered at the start of the test It will not change during a test Breath C...

Страница 108: ...VT Plus HF Operators Manual 8 18 Figure 8 9A Stacked Volume Test screen Figure 8 9B Stacked Volume Test screen ...

Страница 109: ... the Communications menu The currently selected mode shows a check mark next to its name Test Parameter This is the parameter that was chosen for running this test This value will not change during the test Wave Form Starts the continuous transmission of waveform data from the VT PLUS HF Flow volume airway pressure auxiliary pressure and differential pressure data are received at a 50 Hz rate Both...

Страница 110: ...ted ventilator parameters The par files are generated from the vtp files using a file conversion program This is done by selecting GENERATE A PARAM FILE from the VT Plus for Windows file menu bar Files must be closed to enable this option The par files are in ASCII format and can easily be imported into your favorite spreadsheet VT Plus for Windows has a simple means to annotate data files Each of...

Страница 111: ...ant to overwrite the existing file If you select NO the file will be appended to at its end Figure 8 10 File menu The REVIEW DATA FILE is available to open an existing file for playback You may also use the open file button on the tool bar To close data files select CLOSE FILES from the menu or use the file close button on the toolbar Note VT Plus for Windows does not store data in a buffer tempor...

Страница 112: ...playback of data files You can bring up the File Control Interface by selecting the file control button on the toolbar or by selecting FILE CONTROLS from the file menu bar There are four main panels or sections in the File Controls Interface Playback Controls Event Markers File Information and Event Figure 8 11 File Control Interface ...

Страница 113: ...yback to the previous event marker in the file Automatic event markers provide periodic events for the file to be rewound or forwarded to This button may be enabled during data playback to allow for continuous play In continuous play the data file will automatically rewind to the beginning of the file as soon as the end of the file is reached FORWARD This button advances the data file during playb...

Страница 114: ...n Automatic Event Markers Automatic event markers are placed in data files to assist in the rewind and forward functions during playback Recall that rewind and forward simply move the data file from event to event In the absence of user events i e Time or Annotate there would simply be beginning and end of file events You may adjust the time intervals between automatic events To set the time inter...

Страница 115: ...l file is a data file of raw waveforms The sig files are generated from the vtp files using a file conversion program Do this by selecting GENERATE A SIGNAL FILE from the VT Plus for Windows file menu bar Files must be closed to enable this option The sig files are in ASCII format and can easily be imported into your favorite spreadsheet They contain raw flow pressure volume auxiliary pressure and...

Страница 116: ... memory onboard the VT PLUS HF VT Plus for Windows may be used as a utility to load new versions of operating software into the VT PLUS HF Caution Using this utility to load new versions of VT PLUS HF software will overwrite any user settings stored in the VT PLUS HF Loading new software via this utility will not change the calibration of the VT PLUS HF The procedure is as follows 1 Select FILE th...

Страница 117: ...scaled every time they reach the end of the plot The loop plots are re scaled on every breath You may turn off the automatic re scaling by unchecking the box next to the plot s name in the PLOTS SCALING AUTO SCALE menu Auto scaling is automatically turned off for a plot if you manually re scale that plot Auto scaling can also be turned off by right clicking on a plot and unchecking the AUTO SCALE ...

Страница 118: ...L SCALE from the plot s menu bar Then click on the preferred plot Figure 8 16 Scaling Manual Scale The following dialog box will appear and you can set the range for re scaling as preferred Figure 8 17 Manual Scale New Scale Range 1 You can right click on the plot that you want to re scale Select MANUAL SCALE and the above dialog box will appear You can then select the preferred range ...

Страница 119: ...elect the plot s name from the plots menu and select the name of the signal you want displayed The desired signal s name should appear on the title of the plot and above the statistics to the right of the plot The statistics and the plot now reflect the new signal and are displayed in the selected units for that signal Figure 8 18 Selecting a Signal To change the units for a signal select SIGNAL U...

Страница 120: ...sensors The VT PLUS HF has two different ways to perform a manual zero 1 Select ZERO from the menu and then choose to ZERO ALL or select the signal you would prefer zeroing from the given list Figure 8 19 Zeroing Menu 1 Select the ZEROING SPEED button from the tool bar Choose the preferred plot from the given list Just clicking the ZEROING button is the same as selecting ZERO ALL Automatic Zeroing...

Страница 121: ...termining the phases of a breath To change the breath detect mode select BREATH DETECT from the SETUP menu and click the preferred option Breath Detect Threshold The VT PLUS HF breath detection algorithm uses a flow rate threshold that the flow must cross to trigger a change in the breath phase Higher flow rate thresholds yield less sensitive breath detection Lower thresholds yield more sensitive ...

Страница 122: ...ion on the gas settings refer to Chapter 4 System Setup To change the gas settings select GAS SETTINGS from the SETUP menu The following dialog box will appear and you can make the changes Figure 8 21 Gas Setting Dialog Box By selecting the ADVANCED option the gas settings dialog box lets you adjust the temperature viscosity molecular weight and relative humidity for both the inhaled and exhaled g...

Страница 123: ...Gas Flow Analyzer VT Plus PC Software 8 8 33 Figure 8 22 Advanced Gas Setting Dialog Box Note If you don t know the viscosity or molecular weight of the gas you are using click the GAS CALCULATOR button ...

Страница 124: ...of the user gases The user gases have three predefined gas options and a user defined option Select your gas from the list of predefined gases or if the gas you are using isn t one of these predefined gases select the user defined option Enter the molecular weight viscosity coefficient and viscosity intercept into the boxes given Clicking the AIR button or the RESPIRATION button will set the calcu...

Страница 125: ...user to calibrate the barometric pressure offset by entering the local barometric pressure into the system The entered value is used to calibrate the system s barometric pressure offset during future use To change the barometric pressure select BAROMETRIC PRESSURE from the SETUP MENU Enter the local barometric pressure in the box provided and click the OK button Figure 8 24 Barometric Pressure Dia...

Страница 126: ...VT Plus HF Operators Manual 8 36 ...

Страница 127: ...l flow measurement Flow measurements can be either static flows no breath variations or ventilator waveforms i e both an expiratory and an inspiratory phase The flow measurement is made using a differential pressure drop across a resistive screen mesh This flow measurement can be used for pediatric adult ventilators or for determining the performance of many types of flow meters Valves are used to...

Страница 128: ... Low Pressure This is a dual port connection consisting of a positive and a negative pressure port The differential pressure range is 500 mmHg This pressure measurement can be used for any pressure differential or gauge pressure in the given range The transducer is capable of measuring fluid pressure on the positive port as indicated on the label Barometric Pressure A barometric pressure measureme...

Страница 129: ... Tidal volume Minute volume Breath rate Inspiratory to expiratory time ratio I E ratio Inspiratory and expiratory time Peak inspiratory pressure Inspiratory pause pressure Mean airway pressure Positive End Expiratory Pressure PEEP Lung compliance leak Leak test pressure decay over time Inspiratory hold time Expiratory hold time Peak expiratory flow Peak inspiratory flow Base flow ...

Страница 130: ...r Consumption 132 Volt Amperes Fuse Rating 0 5 A Slo Blo 3 Performance Specifications Low Pressure Port Maximum Applied Pressure 60 psi Operating Pressure Differential 500 mmHg 10 psi Operating Pressure Common mode 30 psi Span Accuracy 0 50 of reading or 1 5 mmHg whichever is greater Frequency Response 10 Hz Resolution 0 1 mmHg Sample Rate 100 Hz Note Fluid pressure may be applied to the positive ...

Страница 131: ...pm Accuracy 2 0 of range Resolution 0 01 lpm Frequency Response 25 Hz or t10 90 40 ms whichever is greater Sample Rate 100 Hz Dynamic Resistance 2 00 cmH2O 60 lpm Low flow Dropout 25 lpm Breath Detect Threshold user settable 2 0 lpm Volume Range 60 l Notes Tidal Volume Accuracy 3 of reading or 10 ml whichever is greater Volume Accuracy tested to 7 liters Flow accuracy is specified for dry air or o...

Страница 132: ...ted to 1 liter Flow accuracy is specified for dry air or oxygen Do not use with humidified gases Below 0 25 lpm measurement accuracy is obtained by allowing the VT Plus HF to fully warm up and manually zeroing before reading or documenting a measurement ...

Страница 133: ... Peak Inspiratory Pressure 0 1 cmH2O 120 cmH20 3 or 1 cmH20 Inspiratory Pause Pressure 0 1 cmH2O 120 cmH20 3 or 1 cmH20 Mean Airway Pressure 0 1 cmH2O 80 cmH20 3 or 0 5 cmH20 Positive End expiratory Pressure PEEP 0 1 cmH2O 5 to 40 cmH20 3 or 0 5 cmH20 Lung Compliance1 0 1 ml cmH20 0 150 ml cmH20 5 or 5 ml cmH20 Inspiratory Time 0 01 s 0 60 s 0 5 or 0 02 s Inspiratory Hold Time 0 01 s 0 60 s 1 or 0...

Страница 134: ...VT Plus HF Operators Manual A 8 ...

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