Respiratory Technology DX-SYSTEM Limited Modular Approval Transmitter User Manual Dx pH Sensor Instructions For Use
Respiratory Technology Corporation Limited Modular Approval Transmitter Dx pH Sensor Instructions For Use
manual
Dx–pH Measurement System™
Model Number XXXXX
Instructions for Use
Respiratory Technology Corporation
13670 Danielson St., Suite F
Poway, CA 9064
Ph (858) 679-300
Fax (858) 679-359
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Dx–pH Measurement System™
User’s Manual
Version X.X
August, 2005
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The contents of this user’s manual are the property of Respiratory Technology Corporation.
No part of this publication may be reproduced, stored in a retrieval system, be transmitted
by any means – electronic, mechanical, photocopy, recording or otherwise be used in any
form, by any means other than its intended purpose, without the prior written permission of
Respiratory Technology Corporation.
This publication is supplied for the purpose of using the Dx–pH Measurement System™
only. Respiratory Technology Corporation is responsible for the reliability and
performance of the Dx–pH Measurement System™ only if the following conditions are
met:
1. All repairs and modifications are carried out by Respiratory Technology
Corporation or its assigned agents.
2. Caution: Changes or modifications not expressly approved by the party responsible
for compliance could void the user's authority to operate the equipment.
3. This device complies with part 15 of the FCC Rules. Operation is subject to the
following two conditions: (1) This device may not cause harmful interference, and,
(2) This device must accept any interference received including interference that
may cause undesired operation.
4. The transmitter’s end location will have a label on the outside compartment stating:
“Contains FCC ID: TLUDX-SYSTEM”
CAUTION: Federal Law (USA) restricts these devices to sale by or on the order of a
physician.
Contraindications: Deviated Septum, nasal congestion or infection.
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Table of Contents
Introduction
Intended Use
Symbols
Recorder Event and Control Keys
Event Marker Buttons
Control Keys
System Description
Components
Dx Recorder™
Dx–pH DataView™ Software Program
Installing the Dx DataView Software Program
Setup of a New Study
Physician Setup
Setup
Calibrate the Probe
Determining the Proper Catheter Placement
Retrieving and Reviewing a Study
Download pH Data
Opening a Past Study
Graphs and Reports
Changing the pH Scale
Altering the Graphs
Viewing the Report and Diary
Printing Graphs and Reports
Printing Graphs and Reports
Patient Operation of the Dx–pH Recorder™
Troubleshooting
Cleaning
Service
Attachment A
Patient Instructions for Use
Attachment B
Example Patient Diary
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Introduction
The Restech Dx–pH Measurement System™ is a 24/48-hour, ambulatory, pH monitoring
system consisting of a single use pH probe and reusable transmitter and recorder system.
The Dx–pH Probe™ and Dx–Transmitter™ simultaneously measure pH and transmit the
data to a recorder. The Dx–Recorder™ processes the data and saves the information to a
removable secure digital data card. The patient is able to interact with the receiver during
the 24/48 hour pH study to record clinically relevant information such as meals and
symptoms. After completion of the pH study, the pH data and patient information is
downloaded from the data card to a PC using a card reader. The data and information can
be viewed using a Windows based software program.
The Dx–pH Probe™ is provided non-sterile to the end user. It is disposable, with a usable
life of one procedure. All other components are reusable.
Intended Use
The Restech Dx–pH Measurement System™ is intended to measure and monitor
supraesophageal pH changes due to gastric reflux.
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Symbols
The following symbols are used on the Dx–pH Probe™ and/or in the accompanying
documentation.
SYMBOL MEANING
Lot Number.
Non-Sterile.
Date of Manufacture.
Each device is for one (1) use
only.
Expires.
Attention. Read instructions
prior to use.
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Dx–Recorder™ Event Markers and Control Keys
Event Marker Buttons
Heartburn Button
Cough Button
Meals Button
Supine/Sleep Button
Control Keys
Up Arrow Key
Down Arrow Key
Escape Key
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System Description
Components
The Dx–pH Measurement System™ includes the following:
Probe
Dx–pH Probe™
Dx–Transmitter™
NEED PICTURE
Transmitter
The Restech Dx–pH Measurement System™ contains a pH
probe (Dx–pH Probe™) in a short, trans-nasal catheter that
the patient wears for the duration of the study. The Dx–pH
Probe™ measures pH and the transmitter sends the data to
the Dx Recorder.
Dx–Recorder™
REPLACE PICTURE
The Dx–Recorder™ is a portable unit that receives pH data
from the Dx–pH Probe™ and Transmitter. It saves this
information to a removable data card. The patient is able to
interact with the recorder during the pH study to record
clinically relevant information and symptoms.
Data Card
REPLACE PICTURE
The Data Card is inserted into the Dx–Recorder™ after the
physician enters the appropriate patient information on it.
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After the study, the physician removes the card from the Dx–
Recorder™ and inserts it into a Data Card Reader to review
the pH Study using the Dx–pH Data View™ Software on a
personal computer.
PC Flash Memory Card Reader
REPLACE PICTURE
Interfaces with the computer to download the data from the
SD data card for display in the Dx–pH DataView™ software.
Dx–pH DataView™ Software
(CD Rom) REPLACE PICTURE
The Dx–pH DataView™ Software displays pH data that is
stored on the Data Card by the Dx–Recorder™.
Dx–Calibration Vials™ and Dx–Calibration Stand™
REPLACE PICTURE
The Dx–pH Probe™ is calibrated with pH 4 and pH 7
standard buffer solutions prior to use in a study. Water is
also included in the calibration kit to rinse the probe between
calibrations.
Special Tool The “special tool” is provided by Restech to ensure proper
handling of the transmitter when changing the coin cell
battery. It is to be used to remove the cover on the
transmitter to allow battery access. It is also recommended
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that this is used in removing the data card out of the back of
the recorder.
NEED PICTURE
Batteries
Two AA alkaline batteries are required to power the Dx–
Recorder™.
REPLACE PICTURE
X Volt Lithium Coin Cell Batteries
NEED PICTURE
To Be Supplied by User:
Computer
REPLACE PICTURE
A PC with CD ROM Drive and Windows based operating system
runs the Dx–pH DataView™ Software program, generates reports to
be printed and stores patient data on the hard drive.
(Recommended system requirements: 600 MHz Pentium III, Celeron
or equivalent processor. Recommended disk space of 155 MB and18
MB RAM.)
Printer
REPLACE PICTURE (Windows compatible) prints patients’ pH reports for review by the
prescribing physician.
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Dx–Recorder™
The Restech Dx–Recorder™ is an external unit that receives and stores data sent by the
Dx–Transmitter™. Upon completion of a study, trained personnel will remove the data
card from the recorder and insert it into a PC flash memory card reader. The Dx–
Recorder™ is designed to be lightweight, compact and easy for both the clinician and the
patient to use.
The Recorder face:
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Dx–pH DataView™ Software Program
Installing the Dx–pH DataView™ Software Program
1. Insert the Dx–pH DataView™ CD disk into your computer’s CD drive
2. The installation window will either open automatically OR you can
open the disk using Windows Explorer.
3. Open the Dx–pH DataView™ folder by double clicking the icon.
4. Open the Installation folder by double clicking the icon.
5. Double click the Install.msi icon.
6. Installation Wizard will begin.
7. After reading the Warning, click NEXT to continue.
8. The Wizard will inform you where the program will be installed, click NEXT to
continue.
9. The Wizard will display the message “Ready to Install Application,” click NEXT to
continue.
10. When the program has been successfully installed, click NEXT to continue.
Setup of a New Study
To setup a new study, start the Dx–pH DataView™ program by double clicking the icon on
your desktop or selecting it from the Start menu.
Insert a formatted SD data card (supplied by Restech) into the card reader of your
computer.
A window titled “Removable Disk” should appear, close the window to continue.
In your Dx–pH DataView™ program, select “New Patient” from the File menu.
Enter the last name, first name, and study date in the appropriate fields. The patient name
and study date are required fields; you will not be able to proceed if these fields are left
blank.
Here you can also enter three user definable symptom events for your specific patient’s
study. Click the button that reads “Enter.” A warning will appear that reads “you are about
to overwrite all data on the card. Are you sure you want to do this?
If you have saved all studies in the Dx–pH DataView™ program, or printed the studies and
saved them with the respective patient’s files, choose YES.
If you did not save the last study on the card and wish to do so, choose NO. Go
back and save your previous study as instructed in the section entitled “Viewing and
Altering Graphs.” Exit the program and restart it, then verify that you have saved
the data before deleting it from the card.
A window will appear prompting you to specify the location of your card reader. Select the
appropriate drive and click OK.
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The program will also ask you to confirm that all the information is correct, and if you are
finished. Click YES or NO.
After entering the patient data on the memory card, remove it from the card reader and
insert it into the Dx–Recorder™ unit.
Insert Picture of Side of recorder/Proper Insertion
Physician Setup of the Dx–Recorder™
Note: It is important that you replace the batteries in both the transmitter and
recorder prior to beginning each new study.
Replacing the Batteries
It is crucial that the batteries are replaced before each study, as the recorder will not allow a
new study to be started unless new batteries are used.
Dx–Recorder™
Dx–Transmitter™
Insert Pictures of Proper Battery replacement
Setup
Setup allows you to adjust the system time, select the study duration, and set user interface
options.
You will be prompted to either accept or change time and date information. If the time and
date are correct, press any round shaped key to accept. If either is incorrect, you may reset
it using the up/down arrow keys and then pressing any round key to accept.
Next, you will be asked to choose if the pH display is ON or OFF. If OFF is selected, the
patient’s display will only show the current time and patient name, it will not display the
pH value during the study.
Finally, you will be prompted also to choose if an audible beep is ON or OFF. If ON is
selected, a beep will sound when an event button is pressed. If ON is selected, no beep will
sound when any event button is pressed.
The system will return to the main menu and apply the new settings once all choices have
been entered.
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Place a new coin cell battery into the transmitter (as shown above). When a new lithium
coin cell battery is placed in the transmitter, it will power up and perform basic memory
and function tests. If an error occurs, the transmitter will have the LED on the probe
remain lit and send an error message to the recorder. If the tests are non-problematic, the
transmitter will switch into normal operation mode and the LED will start flashing.
After identifying the appropriate transmitter, attach USB plug on the back of the transmitter
to the jack on the end of the catheter; the connection should be secure without forcing it.
INSERT PICTURE HERE
Calibrate the Dx–pH Probe™
The clinician operating the transmitter and recorder during setup should have sufficient
training prior to using the system. Only authorized clinicians should be authorized to
operate the configuration and calibration controls. The patient will not be able to access this
interface at any time during their study.
When calibrating a sensor, be sure to use only the fresh pH buffer solutions supplied by
Restech for the most accurate calibration values. For convenience and safety, Restech
provides the color coded Dx–Calibration Stand™ and the Dx–Calibration Vials™ which
are pre-filled with pH buffer solution.
Select “Cal” from the main menu.
The recorder will display the Transmitter ID number that was used. You will be prompted
to accept this ID. Pressing the up or down keys allows you to change the ID #. Press any
round key to accept when the appropriate transmitter ID is displayed.
A series of calibration displays will guide you through the process; you will first need to
pre-soak the probe tip in pH 7 for at least ten minutes. If this has already been
accomplished, you may select to bypass the presoak. After calibration in pH 7, you will be
instructed to place the probe in the water, also supplied in the Restech Dx–Calibration
Vials™ and then in pH 4. After calibration in pH 4, you will be instructed to rinse the
probe with water. After rinsing the probe, the calibration routine is complete.
The system will display the current pH reading of the probe. If you are not satisfied with
the calibration results, press Esc, and then select the “Cal” option from the main menu to
perform the calibration process again.
The system will not allow a new study to be performed unless the calibration has been
performed successfully. If there is data on the card from a previous study, the recorder will
alert the user and return to the main menu. A previous study can only be removed using the
Dx–pH DataView™ Software. If no previous study exists, the patient’s name will be
displayed on the screen.
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You will also be prompted to select either a 24 or 48 hour study. Use the Up / Down keys
to select the appropriate time duration and then press any round key to accept
Determine Proper Positioning of the Catheter
Ask the patient which side of their nose is clearer and easier to breathe through. Numb this
side with Xylocaine gel, 2% on A Q-tip, but do not numb the patient’s throat. Insert the
probe through the patient’s nose. The round tip will help it curve around into the
oropharynx. It may be helpful to saturate the catheter of the probe in a lubricant to ease the
insertion.
Use the markings on the side of the catheter to determine when it has been inserted to 12
cm. Have the patient open their mouth, and with a tongue depressor, push the patient’s
tongue down. The LED will blink after starting the study on the recorder. Use this light to
help determine when the probe is in the appropriate position in the patient’s oropharyngeal
region.
Note: Have the patient swallow sips of water to see if they can feel the probe in their throat;
if they can, pull it back slightly until it is comfortable for the patient.
After the proper position has been determined, attach the catheter to the patient’s face using
surgical tape, securing the catheter as closely to the nares as possible to ensure that it does
not move during the study.
The patient may prefer to have the transmitter either taped to the skin or attached to their
clothing with the provided clip on the transmitter case. If it is attached to their clothing, be
sure to tell them to use caution when changing clothes so they do not rip the tape off their
skin or pull the probe out.
Retrieving and Reviewing a Study
After completing the prescribed study duration, the patient will return the unit to the
physician’s office. Here, a nurse or the physician will remove the Dx–pH Probe™ and
collect the equipment.
After the patient has returned the device, use the special tool provided with the transmitter
to remove the data card from the recorder by gently pressing the card in slightly further,
then allowing it to retract out from the slot.
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Download pH Data
Start the Dx–pH DataView™ program by clicking on the icon or selecting it from the start
menu.
After removing the data card from the side of the recorder, insert it into the provided card
reader. If a window for the card automatically opens, simply close it and proceed with the
following instructions.
In the “File” menu of the Dx–pH DataView™ program, select the option to “Retrieve
Completed Study”
Opening a Past Study
Start the Dx–pH DataView™ program by selecting it from the start menu or double
clicking your desktop icon.
From the “File” menu, select “Open Patient File”
Select the appropriate patient from the list and double click it.
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Viewing and Altering Graphs
To view a graph of the patient’s study, select “Graph Data” from the “Graph” Menu while
their information is on the screen.
Changing the pH Scale
The pH scale is set at a default of 0-10. To change this scale, select “Y” Scale Unlock from
the ““Y” Scale” Menu. Now you can enter the desired values for the study in review.
When the appropriate range has been entered, select “Y” Scale Lock from the “Y” Scale
Menu. These values will become the “default” values for the study.
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Altering Graph Views
1. You may also enter the number of minutes to average and the percent drop below
baseline.
The program averages the values over the specified number of minutes (baseline) and
detects drops of the specified percentage below baseline.
2. When viewing the pH graph, you can manipulate it in various ways to control
which information you view. The three buttons in the top right corner of the screen
perform various functions to allow this manipulation.
a. The button on the left allows you to move the cursors along the X
axis. When the cursor rests on a point, it will display the time and
date, as well as the pH value of that point.
b. The middle button provides six different functions:
These functions are the following:
Select one rectangular section of the graph to enlarge;
Select an area to stretch and enlarge along the X axis;
Select an area to stretch and enlarge along the Y axis;
Auto scale–Return to graph to its original configuration
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Enlarge a portion of the graph with respect to a chosen point.
Reduce the size of the graph with respect to a chosen point.
c. The button on the right to grab the graph at any point and drag it
up, down, to the left or the right.
3. The button is for scrolling in fine increments to view pH changes with
precision along the X or Y axis. Note that to use it along the Y axis, the “Y” Scale
must be unlocked.
The two graphs below illustrate this function. The graph on the right is an expanded
version of the graph on the left; the cursor is on the same point in each graph. The
information that is displayed is the same.
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4. The horizontal scroll bar allows you to move the entire tracing itself along the X
axis or to scroll along the pH tracing while viewing the pH values and time in the
fields on the right hand side. To do the latter, the cursor must be engaged.
5. The cursors can be used to examine values at certain points, as well as to delete
certain data from the analysis (Artefacts).
The button in the center allows you to change the color and style of the cursor, the point
style, the line style and width, display the name of the cursor, bring it to the center of the
page, and go to it. The lock button secures the specific cursor characteristics you have set.
When trying to remove data, move the cursors to either side of the data set you want to
remove. Ensure that the points are correct by looking at the values displayed. When you are
certain that the points should be removed, click the button that says remove data between
the cursors (the Artefact).
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Before: After:
If you think you may have made an error, or you would like to perform the edit again, click
the button that says Undo Delete.
After deleting the specified data sets, it will not be included in the analysis and will not be
printed. To replace this data, you will have to download the study again from the data card.
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You can right click on any point on the graph to display the following menu:
An event marker appears on the lower graph as follows:
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Changing the Style of Graphical Elements (Lower Graph)
Placing your cursor over any of the three lines (Meal, Supine, or Symptoms) and right
clicking your mouse will allow you to change the appearance of the lower graph.
The following menu will
appear:
“Fill Base Line” will
Selecting “Common Plots” will allow
you to change the type of graph you
use to view the study data
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Changing the Style of Graph Elements (Lower Graph - Continued)
Choosing “Color” will allow you to change the color of each
line. You must place the cursor over each line individually to
change the colors.
“Line Width” allows you to adjust the
width of the graph lines
“Bar Plots”
The “Interpolation” function allows
you to connect the points using
various methods of interpolation
illustrated in the six different option
boxes.
“Y Scale” shows you what is
displayed on the Y axis.
“Line Style” allows you to choose the style of line you want to
view: solid, dashed, dotted, etc.
“X Scale” shows you what is
displayed on the X axis.
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Note:
After altering the graph, be sure to recalculate the points in the “Report” menu and select
“Save Graph” from the “Graphs” menu.
Viewing the Report and Diary
To view the report, select “View Report” from the Report menu.
A warning will appear to remind you to recalculate the points if you have made changes to
the graph or other data. The following message will appear if you choose to recalculate the
data:
Wait until the message disappears before clicking anything: doing so before appropriate
will only increase your wait time.
The report contains fields for the following information:
Patient name (first and last), patient number, birth date, study date, gender, height, weight,
Investigator, and referring doctor. The patient name (first and last) and study date are
required fields in specific formats.
The user defined events are displayed, and if none were entered, the words “Event 1, Event
2 and Event 3” will fill the space.
Also in the report are the arithmetic mean, standard deviation, variance, median, maximum,
and minimum values.
The pH events are numbered alongside the lowest pH and the start time of the event.
In the patient diary, the “symptoms” are listed in chronological order with a start and stop
time for each symptom. Supine and Meal periods are listed here as well.
You can alter the patient diary in the event that a button was inadvertently pressed or was
not pressed when it should have been because the patient forgot to. If you must enter time
based on the patient diary, such as a meal, try to verify the time given visually by looking
at that point on the graph to check for coincidence.
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Symptom Index
The symptom index correlations are performed by…………
You may add notes that will be printed with the report as well in the field labeled “Notes:”
When finished with the study, you may initialize the card for a new patient. You should do
this as soon as you know the information for the next planned study.
Note: If you choose to initialize the card all previous information will be removed from
that card; make sure the patient data has been saved.
Printing Graphs and Reports
Selecting “Print Graph” from the Printing Menu prints the graph with no preview.
If you select “Print Study” from the Printing Menu, you will be asked how many pages you
want the study to occupy.
Select desired number and click “ok” or cancel to nullify your request.
Selecting “Print Report” from the Printing Menu prints the Study Report with no preview.
To change the settings for the printer and the page setup, choose “Page Setup” from the
Printing Menu.
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Click OK when the desired settings have been selected.
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Patient Operation of the Dx–pH Measurement System™
The Dx–pH Measurement System ™ was designed with patient convenience and ease of
use as two of its foremost concerns. The patient is responsible for pressing event buttons,
keeping a diary, and following the physician’s instructions.
Before the patient is sent home, the following instructions must be emphasized along with
the regular patient instructions (attachment B):
• How to keep a written diary. For analysis, information about episodes of pain and
episodes of cough, supine periods, and meal periods is needed and is very
important. (See attachment B)
• How and when to use the event keys. Take care to emphasize the importance of
pressing the Heartburn key immediately when chest pain is felt, as well as the
other symptom buttons to ensure an accurate analysis.
• Not to bathe/shower with the Dx–Recorder™ or Dx–Transmitter™ or expose them
to water; they are not waterproof, only water resistant.
• To keep the Recorder within a reasonable distance to avoid data loss.
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Troubleshooting
Symptom Possible Cause Try
Initial Start Up
Status display indicates low
batteries. AA Batteries are low. Replace AA Alkaline
batteries.
Calibration
Incorrect Calibration Fluids
or sequence used. Press Esc and repeat
calibration in proper
sequence or try another
probe
Status display indicates a
failed calibration.
Inoperable sensor. Try another probe
Status display indicates that
transmitter is out of range.
No readings.
Transmitter out of range.
Inoperable transmitter. Move recorder closer.
Select new device. Return
to manufacturer for
evaluation.
Recorder will not accept the
data card Data is still saved from
previous study Download data into Dx–ph
DataView™ and reinitialize
card
Start pH Study
Transmitter identified does
not match the one identified
for study.
Unit was not calibrated
using this transmitter. Recalibrate.
No pH reading displayed in
study mode. Medical provider has
configured unit to have
readings turned off.
Data Transfer
PC indicates no card. SD card reader not plugged
into USB port. Verify connection.
Patient Interface
Unit does not beep when an
“event” button is pressed. Medical provider has
configured unit to have beep
turned off.
Notify medical personnel
Unit does not beep when an
“event” button is pressed.
Button is not functioning Record events in patient
diary.
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Cleaning
The exterior surface of the Dx–Recorder™ may be wiped down with a soft cloth lightly
moistened with 70-90% isopropyl alcohol. The recorder should be turned off when
cleaned. Care must be taken not to allow any liquid to pass into the front cover of the
Recorder. Let the surfaces evaporate thoroughly before use.
Service
The Dx–Recorder™ does not require routine calibration or servicing of internal
components, unless the recorder becomes damaged. For general service of the unit, please
contact your sales representative or Respiratory Technology Corporation Customer Service
at (800) XXX-XXXX.
See your warranty information for contact information and eligibility requirements.
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Attachment A - Patient Instructions
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Attachment B - Patient Diary
Shown below is an example of a patient diary for patients to fill out during their individual
pH studies. Explain the importance of the proper use of the patient diary. Let the patient
know that (s) he can go about his or her daily routine as usual. Instruct your patient to fill
in the diary for meals and sleep periods using the time from the clock displayed on the Dx–
Recorder™. This will ensure that the diary times entered in the Dx–DataView™ software
are correct when the patient’s pH study is analyzed.
Patient Diary
Restech Dx–pH Measurement System™ Study
Patient Code Investigation Date
All Meals Begin Time End Time What I Ate
Breakfast
Snack
Lunch
Snack
Dinner
Snack
Snack
Lying Down Begin Time End Time Remarks
Time
Time
Time
Time
Significant
Symptom Begin Time End Time Description
1
3
4
5
6
7
8
9
10
11
12
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