manual utilizare nautilus-v18e
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REF: NS 01
USER’S MANUAL
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TABLE OF CONTENTS
1. PRODUCT DESCRIPTION ........................................................................................................................................ 4
1.1. Indications for use
1.2 The ECG Method for Catheter Guidance
1.3 Configuration
2. CONTRAINDICATIONS ........................................................................................................................................... 5
3. WARNING AND PRECAUTIONS ............................................................................................................................ 5
4. WORKFLOW PROCEDURE ..................................................................................................................................... 7
4.1 System setup
4.2. Software application setup
4.3 Patient preparation and vein puncture
4.4 Connecting the Nautilus E/S Adaptor
4.5 Electrical vs. saline adaptors
4.6 Display ECG waveforms
4.7 Document the catheter tip location
4.8. Catheter Guidance
4.8.1. Upper superior vena cava
4.8.2. Lower third of superior vena cava
4.8.3. Cavo-atrial junction
4.8.4. Right atrium
4.8.5. Catheter tip placement verification
5. ERROR MESSAGES AND TROUBLESHOOTING ............................................................................................... 14
5.1 Electrodes not connected
5.2 ECG module not connected
5.3 Battery status
5.4 Printer error
6. CLEANING AND DISINFECTION ......................................................................................................................... 14
7. SERVICE .................................................................................................................................................................. 15
8. MAINTENANCE ...................................................................................................................................................... 15
9. TECHNICAL SPECIFICATIONS ............................................................................................................................ 15
10. RECYCLE INFORMATION .................................................................................................................................. 15
11. CONTACT INFORMATION.................................................................................................................................. 15
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1. PRODUCT DESCRIPTION
Nautilus is an endovascular guiding ECG system used in central venous catheterisation.
1.1 Indications for use Nautilus is indicated for guidance and positioning of central venous catheters such as peripherally inserted central catheter
(PICCs), central venous catheter (CVCs), implantable ports (ports or implantable cameras) and hemodialysis catheters. The
system provides real-time catheter tip location information and reflects the patient’s cardiac electrical activity.
Limiting but not contraindicated situations for this technique are in patients where alterations of cardiac rhythm change the
presentation of the P wave as in atrial fibrillation, atrial flutter, severe tachycardia, and pacemaker driven rhythm, and in
central venous catheterisation procedures performed through femoral or saphaneous vein access which change the
presentation of the P wave. In such patients, who are easily identifiable prior to central venous catheter insertion, the use of
an additional method is required to confirm catheter tip location.
1.2 The ECG Method for Catheter Guidance Guiding the placement of central venous catheter using cardiac electric signals is an accepted clinical method as practiced in
many health care institutions and as documented in many papers including:
a. Electrocardiogram (EKG) Guided Peripherally Inserted Central Catheter Placement and Tip Position: Results of a Trial
to Replace Radiological Confirmation, by Nancy Moureau et al. published in the Journal of the Association for Vascular
Access in 2010, JAVA Vol. 15 No. 1 2010, pp. 9-15
b. The ECG method for positioning the tip of PICCs: results from two preliminary studies, by Mauro Pittiruti et al.
published in the Journal of the Association for Vascular Access in 2008, JAVA Vol. 13 No. 4 2008, pp. 112-119
Figure 1 illustrates the different ECG waveforms at different locations in the venous system as currently accepted and
documented by the clinical community.
Figure 1: Changes in ECG waveform depending on the
location of the central venous system
The basic principle of the ECG method is that the position of the tip inside the venous system can be detected by regarding
the catheter itself (or a guide-wire inside the catheter) as an endovascular electrode which replaces the “red” or “right
shoulder“ electrode of the standard surface ECG.
The system displays through the user interface graphic communication the waveforms of the heart’s electric signals. These
waveforms are generated at the tip of the central venous catheter and are captured in real time through the Electrical ECG Adaptor
for endovascular guidance – Nautilus E or the ECG Adaptor with saline solution for endovascular guidance – Nautilus S.
The Nautilus software processes data from the ECG data acquisition module and displays the waveforms that correspond to
the endovascular electrocardiogram registered in the ECG module from the electrodes at skin level and transmitted through
the Nautilus adaptor connected to the device for venous access. By observing the variations of the intravascular ECG
waveform, the user can estimate the position of the catheter tip, as follows:
• When a maximum P wave is registered it means that the tip of the catheter is at the entrance in the atrium (at the cavo-
atrial junction)
• After this maximum, if the catheter is withdrawn the amplitude of the P wave decreases by half which corresponds to the
catheter tip in the inferior third of the vena cava;
• If the catheter is continually withdrawn, the amplitude of the P wave decreases at values similar to those registered at
skin level; this means that the catheter tip is at the superior side of the vena cava;
• If the catheter is placed too deep, the P wave decreases progressively until it becomes biphasic. This means that the
catheter tip is inside the right atrium.
• If the advance of the catheter continues, the P wave becomes entirely negative. In such a situation, the catheter tip is in
the inferior vena cava.
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1.3Configuration
The Nautilus endovascular guidance system has the following components:
- Notebook with an integrated ECG data acquisition module, with grounded
medical grade power supply
- 4 lead ECG cable
- Nautilus software for processing and graphic presentation of ECG data.
Nautilus is used together with its accessories: Nautilus E (ECG endovascular
electric guiding adaptor) or Nautilus S (ECG adaptor with saline solution for
endovascular guiding) for collecting and transmitting endovascular data to the
ECG data acquisition module.
Optionally a printer and a remote control can be added.
2. CONTRAINDICATIONS
There are no specific contraindications related to the use of the Nautilus system.
3. WARNING AND PRECAUTIONS
Warnings
Warning – Before using the Nautilus System for the first time, be sure to read and understand all of the information in this
User’s Manual.
Warning – The Nautilus System may be used only by medical personnel authorised for the catheter placement procedure,
familiar with reading and interpreting ECG waveforms and trained by authorised personnel.
Warning – Failure to abide by the precautions detailed below causes the system and its use to be out of compliance with
regulations and places the patient and the user at risk of injury or death.
Warning – The device must be connected to a properly installed power outlet with protectiveearth contacts only. If the
installation does not provide a protective earth conductor, do not connect the device to the power line and operate it on
battery power, if possible.
Warning - It is forbidden to use this system during the time when surgical interventions of high frequency are carried out on
the patient.
Warning – The battery must be installed for proper operation even if the the Nautilus system is plugged into AC power,
Warning – During operation, the medical chargers shall not be placed on the floor; it is recommended to use a mobile carrier
with multiple sockets.
Warning -Safety tests are performed at the time of manufacture to assure compliance with IEC 62353 standard. Perform
these tests as part of your institution’s maintenance program to assure compliance with the named standard.
Warning - When using the Nautilus system with the Nautilus S and Nautilus E adaptors, always follow the instructions for
use provided with these devices.
Warning - The Nautilus System only works with a sinus rhythm of the heart.
Warning - The Nautilus System User’s Manual provides information about ECG waveforms and their correspondence with
specific locations in the vasculature. In any situation in which the user cannot unambiguously identify ECG waveforms as
described herein, the use of an additional and/or different method is required to confirm catheter tip location, e.g., chest X-ray
or fluoroscopy as indicated by the institutional guidelines and clinical judgement.
Warning - Place skin electrodes carefully at locations indicated by this User’s Manual and ensure good skin-electrode
contact. Failure to do so may cause unstable ECG waveforms and/or ECG waveforms which are not described in this
Manual. In such a case, the use of an additional and/or different method may be required to confirm catheter tip location, e.g.,
chest X-ray or fluoroscopy as indicated by the institutional guidelines and clinical judgment.
Warning - In patients where alterations of cardiac rhythm significantly change the presentation of the P wave as in atrial
fibrillation, atrial flutter, severe tachycardia, and pacemaker driven rhythm, the use of an additional and/or different method is
required to confirm catheter tip location, e.g., chest X-ray or fluoroscopy as indicated by the institutional guidelines and
clinical judgment.
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Warning - In patients undergoing central venous catheterization using venous access through the saphenous or the femoral
veins, the catheter tip will typically not reach the right atrium and the cavo atrial junction. In such a situation, the ECG
waveforms described by this manual cannot be used for catheter guidance and placement and the use of an additional and/or
different method is required to confirm catheter tip location, e.g., chest X-ray or fluoroscopy as indicated by the institutional
guidelines and clinical judgment.
Warning - In certain patients, unstable ECG waveforms may be detected because of the manipulation of the Nautilus E or
Nautilus S by the user. Verify that the connection between the Adaptor and the central venous catheter and the connection
between the Adaptor and the ECG cable are free from contact with any other material and refrain from touching the Adaptor
and any of its connections. If the problem persists, the use of an additional and/or different method is required to confirm
catheter tip location, e.g., chest X-ray or fluoroscopy as indicated by the institutional guidelines and clinical judgment.
Warning - In certain patients, no ECG waveforms may be detected because of very specific impedance mismatch between
the patient and the ECG electrodes. Be sure to use the Instructions for Use provided by the manufacturer of the skin
electrodes. Verify the connection between the patient’s skin and the electrodes, between the electrodes and ECG cable, and
between the Nautilus Adaptor and the ECG cable. If the problem persists, the use of an additional and/or different method is
required to confirm catheter tip location, e.g., chest X-ray or fluoroscopy as indicated by the institutional guidelines and
clinical judgment.
Warning - In neonates, unstable ECG waveforms may be detected because of patient’s movements or manipulation by the
user. In such a situation, the use of an additional and/or different method is required to confirm catheter tip location, e.g.,
chest X-ray or fluoroscopy as indicated by the institutional guidelines and clinical judgment.
Warning - The Nautilus System is not intended to diagnose or treat disease.
Warning - Monitor catheter tip placement during insertion procedure and verify catheter tip location placement using your
institution’s guidelines.
Warning - Do not place and/or use the Nautilus system in the presence of strong magnetic fields such as Magnetic Resonance
Imaging (MRI) devices. The magnetic fields and the radio frequency fields (RF) associated with the MRI environment can
interfere with the system. Consult the MRI manufacturer for more information.
Warning - Always control, adjust and carry out procedures with the Nautilus system as they are specified in the User’s
Manual.
Warning - The Nautilus software is preinstalled on the system; the user cannot modify, recompile and redistribute it on his
behalf. Do not install any software on the Nautilus System unless instructed to do so by qualified Romedex International
personnel and under the guidance of qualified Romedex International personnel. Failure to do so may result in patient and
user harm and system damage.
Warning - Do no install other software application on the system; these can affect the proper operation of the system by
introducing delays, artifacts, interruptions or the impossibility to display ECG waveforms.
Warning - The network connection (local or internet) of the Nautilus System has the inherent risks of such an operation,
especially of the respective network does not observe a minimum safety level. Do not connect the Nautilus System to a
network (local, internet) that has an unknown or insufficient security level!
Warning - If you connect an external device to the Nautilus system (through USB), assure that:
- The storage device does not contain viruses.
- Do not execute the programs and applications that already exist on the storage device.
- The respective storage device does not automatically install drivers and/or other applications, which through their
execution, could consume the system’s resources.
Warning - The system, including all the optional components must be used only with the charger with grounding for medical
use supplied by Romedex International together with the system. If the supply cable is replaced, a cable with the same
characteristics as those from the technical specifications should be used.
Warning - Do not use additional cables, extension cords or outlets with the Nautilus system.
Warning - This device is not to be used in the presence of combustible or flammable gases.
Warning - Do not remove system covers. To avoid electrical shock, use only the power cord supplied with the system and
only connect to properly grounded wall outlets. Only Romedex International qualified personnel should service the system.
Warning - Maximum care should be taken in checking that all connecting cables and connections, such as alligator clips, are
electrically insulated and do not come into contact with other electrical cables or metal surfaces.
Warning - The conductive parts of the ECG cable must not be in contact with other electrically conductive parts.
Warning - Do not submerge the Nautilus system laptop or allow fluid to enter any of the connectors
Warning - The optional printer must be chosen by the user according to the electrical safety and electromagnetic
compatibility standards in effect, and in case of use, the printer’s power supply must be grounded medical grade type.
Warning - Never connect an active device (supplied with power) to the electrical interfaces (for e.g. USB, external monitor,
speakers) of the Nautilus System, if this device does not correspond to the electrical safety and electromagnetic compatibility
standards in effect.
This device must be powered on a grounded medical grade power supply.
Warning - Only qualified personnel shall carry out service operations to the Nautilus System.
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Cautions
Caution - Active electric motor driven equipment, such as pumps, may interfere with the display of the ECG waveforms. In
any situation in which the user cannot unambiguously identify ECG waveforms as described herein, the use of an additional
and/or different method is required to confirm catheter tip location, e.g., chest X-ray or fluoroscopy as indicated by the
institutional guidelines and clinical judgment.
Caution - Equipment such as CT scanners, X-rays and fluoroscopy systems, cauterisers and diathermy equipment, operating
in close proximity may emit strong electromagnetic or radio frequency interference (RFI) which could interfere with the
display of ECG waveforms by Nautilus system. In any situation in which the user cannot unambiguously identify ECG
waveforms as described herein, the use of an additional and/or different method is required to confirm catheter tip location,
e.g., chest X-ray or fluoroscopy as indicated by the institutional guidelines and clinical judgment.
Caution - Electric equipment which requires direct contact with the patient may interfere with the display of ECG waveforms
by Nautilus. Do not use electric cauterization, electric scalpels, and ablation equipment while using Nautilus. In any situation
in which the user cannot unambiguously identify ECG waveforms as described herein, the use of an additional and/or
different method is required to confirm catheter tip location, e.g., chest X-ray or fluoroscopy as indicated by the institutional
guidelines and clinical judgment.
4. WORKFLOW PROCEDURE
4.1 System setup
Find an appropriate location for the system. Ensure the Nautilus System is placed no more than 1,5 meters away from the
patient outside the sterile field.
Connect the system only to a socket with grounding contact.
If the system works on the rechargeable battery pack (battery), check its state. A fully charged battery assures the operation
for approximately two hours.
Connect the ECG cable to the system.
Start the Nautilus system by pushing the start button situated in the upper part of the keyboard.
After start, as soon as the operating system on the laptop is completely loaded, the application is launched by double clicking
on the Nautilus icon. The Nautilus interface is shown in figure 3.
Figure 3: Nautilus main interface
1.The toolbar of the application has the following control buttons for:
a. Loading ECG files.
b. Switch between data acquisition from board or display data from file
c. Modify the application setting, send orders to the board
d. Help.
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The following functions are available on the toolbar:
a. open .ekg file: by pressing this button, the user can choose a previously saved .ekg file and can open it in the application to
see the previously saved data;
b. Switch work method: display waveforms received from the board or display saved waveforms in the .ekg file. By pressing
this button, the user switches between the two work methods: display data from device or display data from the previously
loaded .ekg file.
c. Tools menu – Settings - allows the modification of the application settings.
d. Tools menu – Commands – allows the operator to send orders to the application.
The supported orders are displayed in the Command list. Depending on the selected command, a table is displayed under this
list, which comprises the accepted parameters. The values of these parameters can be established in the right column. The
command is sent automatically to the board when choosing or after modifying any parameter. For example, in the above
image, the user has chosen the first command Set Amplification to board. It accepts a single parameter, the amplification
level, that can be established from the list displayed in the right column of the table (Value).
Accepted commands:
Name Description
Normal Mode The board shall switch to “normal” where the exterior values are received, from the
attached catheters.
Simulation Mode It shall switch to “simulation”, where values generated internally by the board are
displayed and which simulate a real situation.
Set Amplification It sets the amplification level of the board. The possible values of a single parameter
are: 0, 1, 2 and 3 corresponding to signal amplification values of 32, 64, 128
respectively 256 for 1mV.
Set Speed Establish speed values when data shall be acquired.
Possible values: 0,1, 2 and 7 corresponding to speeds of 50, 100, 150 and 300Hz.
Calibrate Calibrate command: Following this command, the board shall generate a row of 250
values of 1mV.
Set Filter Establishes the filter that shall be used: 0 – shall not be used; 1 - 50Hz filter; 2 - 60Hz
filter;
Set Acq Mode Establishes the ECG signal filter method (averaging filter “low pass”): 0 – without; 1
– standard averaging; S – maximum averaging.
Pacemaker
Detector
Establishes if a pacemaker is detected or not: 0 – no; 1 – yes.
e. Help menu – Displays the About window that shows the application version, as well as the firmware version installed.
f. Help menu – Demo displays a video clip that presents the functionalities available in the subsequent versions.
2. Main screen where the real-time ECG waveforms are displayed: the reference skin ECG waveform (lead III in Einthoven’s
reference system) and the guiding ECG waveform at the tip of the catheter (lead II in Einthoven’s reference system). By
clicking on this screen the user will switch to “PAUSE” mode; in this mode the application is not showing the actual
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waveforms received. Instead the image will freeze. This is shown by displaying “PAUSED” in place of pulse. Clicking again
the application will resume and the data is displayed again.
3. Application logo and the current pulse value.
4. Information regarding the “patient’s name”, “institution”, “catheter type” and “inserted length”, which shall be displayed
on the printed label. This information, together with the application version, is also saved in .ekg files.
5. Group of buttons that allow the modification of the data acquisition module from board. The SCALE buttons modify the
board amplification; the SPEED buttons affect the acquisition speed.
6. Button group with the following functions:
a. FREEZE “freezes” the waveforms displayed in screen 2, copying them in screen 7. Thus a reference image is created, that
the operator can use to compare with the waveforms currently displayed in screen 2.
b. PRINT shall automatically save the data and shall save a *.jpg file label on the disk to be subsequently printed. If an
optional printer is attached, the PRINT function shall print the label at the optional printer.
c. SAVE shall save the .ekg file with the data received up to that respective moment
7. Secondary reference screen, where the ECG wave forms shall be displayed still, for comparison.
8. Status indicator of laptop battery.
9. The scroll-bar type controls that allow the modifications of the position where the waveforms shall be displayed.
10. The status bar where information regarding the board operation module is displayed.
11. “New Patient” Button.
11.1 The following information can be input in the corresponding fields on the graphical user interface at any time:
1. Patient name
2. Institution name
3. Catheter type
4. Inserted length
11.2 When pressing the ‘New Patient” button the following events happen:
1. The field “Patient name” is set to the default string “Patient”
2. The field “Institution name” is left unchanged
3. The field “Catheter type” is cleared
4. The field “Inserted length” is cleared
5. The system memory, where ECG case data are stored, is cleared
To power off the system:
a. Close the Nautilus application
b. Power down the Windows operating system on the laptop, by applying the Start-Shut Down sequence.
4.2. Software application setup
The user has the possibility to modify the settings of the application through the Tools – Settings menu. By accessing this
system, a new window with two sections shall open. The window is shown in the images below:
In the “Board” section the user can modify the following parameters, specific to the device:
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Name Description Default value
ComPort Serial port to which the device is connected. automatically
detected
DataBits Setting the serial port. 8
Parity Setting the serial port. 2
BaudRate Setting the serial port. 115200
StopBits Setting the serial port. 1
IdentifyingString Adjusted expression for identifying the string received from
the Device following the identification command (“I”).
EG05000H\d+S\d
+
Warning: the modification of the parameters can affect, if erroneous values are set, the proper operation of the device
(display data with delay or not displaying data, failure in displaying waveforms and even the impossibility to use the
application).
The modification of any parameter in “Board” is reflected in the operation of the application only after its restart. The user is
warned that if he wants these modifications to have immediate effect it is necessary to shut down and restart the application.
In the “Main” section the user can set the following parameters, specific to the software application:
Name Description Default value
Scale factors: I, II, III Factors used to scale the waveforms corresponding to channels I,
II, III. For example, channel II shall be displayed two times
smaller (factor 0.5) compared to the data that arrive from board.
0,5
Display speed The scroll speed for incrementing the chart positions of two
consecutive value sets received from board.
1
Playback speed Frequency in milliseconds for displaying the data read in .ekg
files
1
Playback bytes Number of bytes that shall be read from the file at each time
interval specified in the Playback speed.
3
Print – maximum
number of values
Number of values that shall be used for printing. 400
ACTUAL Text The text that shall be displayed on the printed label, in the left of
the waveform corresponding to the reference point from the
SURFACE
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surface of the skin.
REF Text The text that shall be displayed on the printed label, in the left of
the waveform corresponding to the intravascular reference point.
INTRAVASCU
LAR
Zero detection – Value Maximum value of the difference between two consecutive
values for which we consider the reception of a series of “0”
values.
3
Maximum zero values The number of “0” values that determine the transmission of the
“Wake-Up” command.
1000
Photo location The folder used for saving the files generated by the application
when pushing the SAVE button.
C:\Data
Example: if between two consecutive values there is a difference smaller or equal to 3 (value for Zero detection – Value) than
a meter is incremented. If this meter reaches the 1000 value (Maximum zero values), than the “Wake-Up” command is sent,
after which the board shall restore its activity. The respective meter is reset when the difference between the two consecutive
values is greater or equal to 3.
After the modification of any parameter, the user shall click Save. The executed modifications have immediate effect and are
kept after the shutdown of the application, so that the latest values, those established by the user, are loaded during a new
work session.
4.3 Patient preparation and vein puncture
Connect the ECG cable to the patient:
1. Before preparing the sterile field, take the ECG cable supplied with the Nautilus System and wipe the cable down
according to hospital’s guideline.
2. Locate three ECG snap electrode patches (available on the market) and place one on the patient’s lower left abdomen,
one on the patient’s lower right abdomen, and one on the patient’s left shoulder or arm according to the ECG electrodes
instructions for use.
3. Connect the green clip connector of the provided ECG cable to the electrode snap on the patient’s left lower abdomen
4. Connect the black clip connector of the provided ECG cable to the electrode snap on the patient’s right lower abdomen
5. Connect the yellow clip connector of the provided ECG cable to the electrode snap on the patient’s left shoulder or arm.
6. Leave the red clip connector of the provided ECG cable in a reachable location for the connection with the sterile adaptor
during the procedure.
With the Nautilus System running, the reference skin ECG waveform should be at this time visible and stable. It should be
possible to unambiguously identify the ECG waveform elements, e.g., the P-wave and the R-wave, as represented in this
User’s Manual.
If this is not the case, do not attempt to use Nautilus for catheter guidance and positioning and use another method for
catheter tip location verification as indicated by the institutional guidelines, e.g., chest X-ray or fluoroscopy.
Prepare the patient for central venous catheterisation according to the institution’s guidelines.
Perform vein puncture and venous access per institution’s guidelines, if applicable under ultrasound imaging guidance.
4.4 Connecting the Nautilus E/S Adaptor
In order to obtain ECG waveforms at the tip of the central venous catheter, the non-sterile red clip connector of the provided
ECG cable must be connected to the sterile central venous catheter. This connection is achieved using the Nautilus E or
Nautilus S adaptor. Please refer to the Instructions for Use of these adaptors for details.
When using the Nautilus E adaptor, connect the alligator clip end to the proximal end of the stylet or guide-wire which is
packaged with your venous access device or pre-inserted in one of the lumens of your venous access device. Connect the red
clip connector of the provided ECG cable to the plug end of the sterile Nautilus E Adaptor.
When using the Nautilus S adaptor connect the adaptor piece between the luer connector of the central venous catheter and
then connect the red clip connector of the provided ECG cable to the plug end of the adaptor.
4.5 Electrical vs. saline adaptors
The choice between using the Nautilus E adaptor or the Nautilus S adaptor is a matter of user preference and workflow
optimization and is potentially subject to institutional guidelines. Please refer also to the Instructions for Use of the respective
adaptors.
Typical situations for using the Nautilus E adaptor are:
1. Placement of open-ended PICCs with pre-inserted stylets and luer-locks which allow for stylet position control
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2. Implantable ports using open vein access with over-the-guide-wire catheter placement
3. Any central venous catheter inserted over a guide-wire with centimetre markings
Typical situations for using the Nautilus S adaptor are:
1. Any post-procedural tip location verification of any central venous catheter type.
2. Placement of closed-end PICCs
3. Placement of central venous catheters using the modified Seldinger technique (MST) which do not have pre-inserted
stylets, e.g., tunneled catheters
4. Any central venous catheter inserted over a guide-wire without centimetre markings, e.g., CVCs.
5. Haemodialysis catheters which may require tip location verification for both ends: the long distal end in the right atrium
and the short distal end at the cavo-atrial junction.
4.6 Display ECG waveforms
As soon as a Nautilus adaptor is connected to the catheter and to the ECG cable, the guiding ECG waveform is displayed
(Figure 3).
The waveforms on the bottom in Figure 3 on both left and right hand side display windows represent the electric signal
detected at the tip of the central venous catheter. The red markers show the peak of the R in the ECG waveforms. P wave
changes should be followed on the yellow bottom waveform on the left of the red marker.
The right hand side window in Figure 3 is labelled “Reference”. The reference window allows for saving the ECG
waveforms at a desired location for further comparison. Clicking on the “Freeze” button below the Reference window or
using the left arrow key on the keyboard freezes the display, such that the frozen ECG waveform can be used as a reference.
The scroll speed of the ECG waveform can be selected by using the buttons SPEED + and SPEED -; The amplitude scale for
the ECG waveform can be manually selected by using the SCALE + and SCALE – buttons (5 in Fig 3) or the up/down arrow
keys on the keyboard.
4.7 Document the catheter tip location
The ECG waveforms can be recorded real-time during the procedure by clicking on the “SAVE” button or PRINT (6 in Fig
3). The ECG waveforms are recorded in a file. The file name is automatically generated by the computer if a patient ID is not
input. If a patient ID is input the file name is generated based on the patient ID. The file can be copied to a USB memory
stick or memory card as a removable storage device.
Clicking the “PRINT” button sends a screen shot to the printer if attached and save the screen shot in a file in .jpg format.
The file name is assigned automatically if no patient ID is input and a name is assigned based on the patient ID if a patient ID
is input.
The alphanumeric information input by the user and the ECG waveforms displayed in the Reference window are printed
using the print layout illustrated in Figure 4.
The ECG waveforms from the skin electrodes and the ECG waveforms from the tip of the catheter are displayed in the upper,
respectively inferior side.
The patient name, institution name, catheter type and length, are displayed as they were inputted in the corresponding fields
of the graphical user interface. Moreover, the date and time for generating the image are displayed automatically.
The following information can be inputted in the corresponding fields on the graphical user interface at any time:
1. Patient name
2. Institution name
3. Catheter type
4. Inserted length
Figure 4: Print format
To copy any file from the Nautilus laptop to a removable storage medium, exit the Nautilus application and use the Windows
operating system to copy the desired file to the desired location.
4.8. Catheter Guidance
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Check the presence of a P wave in the surface ECG, then watch the changes of the P wave in the intracavitary ECG while the
catheter progresses onto the heart and assess the position of the tip of the catheter.
4.8.1 Upper superior vena cava
When the P-wave has “normal” dimensions, similar to those of the P-wave on the “surface” or trans-parietal ECG, this
indicates that the tip of the catheter is in the upper part of the superior vena cava.
Fig. 5 ECG waveform at the tip of the catheter in the upper SVC
4.8.2 Lower third of the superior vena cava
When the height of the P-wave is approximately half of the maximum P-wave height reached at the cavo-atrial junction (see
Section 4.8.3), it means that the tip of the catheter is in the lower third of the superior vena cava, just above the cavo-atrial
junction.
Fig. 6 ECG waveform at the tip of the catheter in the lower third of the SVC
4.8.3 Cavo-atrial junction
When the P-wave is fully peaked or at the highest amplitude, and no negative segment before the standard positive P-wave is
visible, the tip is at the caval atrial junction (SVC/RA). This waveform indicates that the catheter tip is at the entrance of the
atrium (ie close to the crista terminalis, at the cavo atrial junction).
Fig. 7 ECG waveform at the tip of the catheter at the CAJ
4.8.4 Right atrium
When the P-wave progressively decreases and a small negative incision before the standard positive P-wave shows up, it is
the first sign that the catheter tip has entered the right atrium.
When the P-wave becomes biphasic (expands beyond the baseline up and down), the catheter’s tip is in the low right
atrium/high right ventricle. This is known as an atrial spike.
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Fig. 8 ECG waveform at the tip of the catheter in the RA
4.8.5. Catheter tip placement verification
The ECG waveforms can be clearly localised based on the specific positioning of the tip catheter in the vascular system.
In any situation in which the user cannot unambiguously identify ECG waveforms as described in Section 4.8.1.-4.8.4, the
use of an additional and/or different method is required to confirm catheter tip location, e.g., chest X-ray or fluoroscopy as
indicated by the institutional guidelines and clinical judgment.
According to institutional guidelines and in accordance with clinical judgment, in indicated patients, and under the conditions
described by this User’s Manual, Nautilus may be used in conjunction with ultrasound-guided vein puncture or open vein
access to replace chest X-ray and fluoroscopy for intra- and post-procedural central venous catheter tip location confirmation.
Using the Nautilus guidance system, central venous catheter tip location can be documented for the patient’s chart either on
paper or electronically.
Using Nautilus, the location of the central venous catheter tip can be determined and documented as required by the different
types of central venous catheters and by different institutional guidelines, for example:
1. When the tip of a PICC catheter must be placed in the lower third of the superior vena cava, the ECG waveforms
illustrated in Figure 6 must be detected and documented at the tip of the PICC catheter.
2. When during intra-procedural catheter insertion or, at later times, during periodical post-procedural catheter tip
verification, the long end of a haemodialysis catheter must be placed in the right atrium while its short end must be placed at
the cavo-atrial junction, then the ECG waveform in Figure 8 must be detected and documented at the long tip and,
respectively, the ECG waveform in Figure 7 must be detected and documented at the short tip of the haemodialysis catheter.
3. When the tip of a central venous catheter (CVC) or of an implantable port must be placed at the cavo-atrial junction, then
an ECG waveform like the one in Figure 7 must be detected and documented at the tip of the catheter.
5. ERROR MESSAGES AND TROUBLESHOOTING
5.1 Electrodes not connected
If Nautilus does not detect any connection of electrodes to the patient, the waveforms shall not be displayed. In such a case,
verify that the skin electrodes are attached to the patient’s skin, that the ECG cable clips are attached to the snap nipple on the
electrodes and that the Nautilus Adaptor is connected to the red clip of the ECG cable. Verify that the ECG cable is attached
to the laptop. If the error situation persists, you may replace the ECG skin electrodes with new ones.
5.2 ECG module not connected
If Nautilus does not detect the presence of an ECG module, the ECG wave forms are not displayed. In this case, contact the
nearest sale representative or distribution office of Romedex International.
5.3 Battery status
The battery status is displayed in the upper right corner of the Nautilus graphical user interface. (8 of Figure 3).
5.4 Printer error
A printer error message is displayed when printing if the printer is not connected or if it is out of paper. Check the printer
connection and paper status and try again.
6. CLEANING AND DISINFECTION
To clean the Nautilus system:
1. Turn off the system
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2. Dampen a nonabrasive cloth with either warm water or rubbing alcohol.
3. Gently wipe the dampened cloth over the exterior surfaces of the laptop.
Warning! Do not submerge the Nautilus laptop or allow fluid to enter any of the connectors.
7. SERVICE
Only the Romedex International personnel is authorised to carry out service operations. For service information please
contact the nearest sale representative or distribution office of Romedex International.
8. MAINTENANCE
Safety tests are performed at the time of manufacture to assure compliance with SR EN 62353:2008. Perform these tests as
part of your institution’s maintenance program to assure compliance with the named standard. The tests which we
recommend to be performed every two years are:
5.2 / SR EN 62353:2008 - visual inspection
5.3.2 / SR EN 62353:2008 - measuring of protective earth resistance
5.3.3.3 / SR EN 62353:2008 - measurement of applied part leakage current
5.3.4 / SR EN 62353:2008– measurement of insulation resistance.
9. TECHNICAL SPECIFICATIONS
1. Netbook, 100-240V, 50/60 Hz, with a power consumption less than 40W
2. Module ECG 4-electrodes, full patient isolation, defibrillation protected, integrated in netbook
3. Nautilus data acquisition application running under Windows operating system.
4. Medical grade charger with grounding, AFM60US18
5. Supply cable with grounding, IEC 3G 1,0 mm2
6. ECG cable with 4 derivations, 2,7m
Accessories:
1. Nautilus E - ECG endovascular electric guiding adaptor
2. Nautilus S – ECG adaptor with saline solution for endovascular guiding
10. RECYCLE INFORMATION
The component parts of the system shall not be eliminated as unsorted municipal waste, but they shall be collected
selectively, according the local and institutional regulations. In order to return Nautilus for recycling, when it cannot be used
anymore, please contact the nearest sale representative or distribution office of Romedex International in the country where
the purchase was made.
If you have any questions or comments regarding
the use of this product please contact us.
For additional information and training materials,
please go to the Romedex International web site:
www.romedex.com.
User’s manual latest review: June 2012
Romedex International SRL
74 Fundeni Str, Bucharest, Romania
Tel: +40.212.550.385
Fax: +40.318.179.962
Email: info@romedex.com
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