AVOXimeter 1000E Operators and Service Manual Rev 9.06

Table of Contents Topic

Page

List of Specific Precautions 3 Introduction to the AVOXimeter 1000E 4 Getting Started with the Instrument 5 Installation 6 Sample Collection 7 Routine Analysis of Blood Samples 8 Correct Cuvette Technique 9 Using the Keypad, Menus, and Other Functions 10 Data Entry via the Keypad 10 Special Function Keys 10 Screens under Main Menu Key: Flowcharts 11 Screens under Computer Key: Flowcharts 12 Battery Power 16

Rev 9.06

Data Management

18

User and Patient ID Quality Assurance User and QC Lockout

20 21

Hemodynamic Computations Calibration and Quality Control Theory of Measurement Troubleshooting Specifications Appendix A: Printer Information Warranty and Service

23 31 40 42 47 48 49

Circuit Diagrams CPU diagram A/D and LED Control Power Control Bandpass Filter Pre-Amp Board Index

50 50 51 52 53 54 55



List of Specific Precautions 1. This instrument is intended for use by persons trained in health care delivery and should be used only by authorized personnel. 2. Operator should be thoroughly familiar with the information in this manual before using the instrument for diagnostic purposes. 3. This instrument should not be used in the presence of flammable agents or anesthetics. 4. For continued protection against fire, replace wall transformer only with the model provided by ITC. 5. Do not allow blood, water, or other liquids to enter the instrument itself. 6. Cuvettes are not sterile. Blood exposed to the cuvette should not be returned to the patient. 7. Do not re-use the cuvettes; discard after each use. 8. Always keep cuvettes in sealed bag with desiccant. 9. For proper calibration and calibration verification, use only the controls recommended in this manual. Controls from other sources yield erroneous results. 10. Operator should take appropriate precautions when handling potentially infectious blood samples. 11. To minimize the hazard of electrical shock, connect the wall transformer only to a properly grounded outlet. 12. Do not leave a cuvette in the oximeter. Remove the cuvette as soon as the sample has been analyzed. 13. When filling cuvette, do not use excessive pressure or cause the vent patch to bulge outward.



Introduction The AVOXimeter 1000E quickly measures the oxyhemoglobin fraction, the total hemoglobin concentration, and the oxygen content in a sample of whole blood in a disposable cuvette. This advanced, microcomputer-based oximeter was designed to outperform earlier wholeblood oximeters and to overcome their limitations. The AVOXimeter has few moving parts, requires almost no maintenance, and has other features to enhance its use in the cardiac catheterization laboratory. Traditional oximeters determine the optical absorbance of blood to obtain a measure of the percentage of hemoglobin saturated with oxygen. Invasive cardiologists use such measurements chiefly for two purposes: 1) to detect intracardiac and great-vessel shunts, and 2) to compute cardiac output by the Fick Principle. Unlike earlier whole-blood oximeters, the AVOXimeter measures both total hemoglobin concentration and oxyhemoglobin fraction. From these measured quantities, it then automatically computes the oxygen concentration ([O2]). No sample preparation is required. Analysis is quickly accomplished by injecting the sample into a disposable cuvette and inserting the cuvette into the instrument. The AVOXimeter then illuminates the sample with multiple wavelengths, records the optical density of the sample at each of the wavelengths, and computes the results. In less than 10 seconds, the oxyhemoglobin fraction, the total hemoglobin concentration, and the oxygen content of the sample are shown in appropriate units on the liquid-crystal display on the front panel. The total hemoglobin concentration measured by the AVOXimeter 1000E includes oxy-, deoxy-, met-, and carboxyhemoglobin: [THb] = [HbO2] + [Hb]+ [MetHb] + [HbCO]. Similarly, the percentage of oxyhemoglobin reported by the AVOXimeter is the so-called fractional saturation:

%HbO2

=

[HbO2] • 100 [HbO2] + [Hb]+ [MetHb] + [HbCO]

The oxygen content of the sample is [O2] = 1.39•THb•%HbO2 / 100, if dissolved oxygen is ignored, THb is expressed in g/dl, and [O2] is expressed in ml/dl. In addition to measuring the total hemoglobin concentration and automatically computing the oxygen content of the sample, the AVOXimeter 1000E has the following advantages over conventional whole-blood oximeters: 1) high sample through-put, 2) accuracy unaffected by carboxy- or methemoglobin, 3) small sample volume (50 µl) for low blood loss, and 4) commercially available material for quality control and proficiency testing. A calculator feature enables the operator to perform many common hemodynamic computations that are done routinely during cardiac catheterization. Examples are body surface area, cardiac output, saturation “step-ups”, etc. The AVOXimeter’s data management features help maintain regulatory compliance. 

Getting Started Chief Features

Each AVOXimeter is calibrated at the factory and ready for immediate use. To put your AVOXimeter to use as soon as possible, follow the brief directions on "Routine Analysis of Blood Samples" (page 8). Before using the instrument for clinical purposes, consult the section in this manual on "Calibration and Quality Control" (page 31) and see the "List of Specific Precautions" (page 3). The rear panel (not shown) has sockets for connecting the wall transformer and an external printer.

2

1 Front Panel

(1) Slot for cuvette insertion. (2) Keypad for data entry. Sample#1 %HbO2 = 97.0 % [O2] = 19.8 ml/dL [THb] = 15.1 g/dL

(3) Liquid-crystal display or LCD.

1

2

3

Cancel

4

5

6

Yes +

7

8

9

No -

.

0

k

Print

Main Menu

Computer

Enter/On

The display has four lines, each with 20 characters.

3



Getting started (Continued)

Installation

1. Place the AVOXimeter 1000E on a laboratory bench away from drafts and bright lights. 2. Plug the wall transformer (battery charger) into an appropriate electrical outlet (domestic model: 110 VAC, 50-60 Hz; export model: 220 VAC, 50-60 Hz). 3. Place the box of disposable cuvettes next to the instrument and keep it there at all times. 4. Turn on the instrument by holding down the Enter/On key. 5. Observe the liquid-crystal display (LCD) on the front panel. 6. Upon power-up, the AVOXimeter 1000E executes a self-test to confirm the proper operation of its light sources. If the self-test fails, the AVOXimeter will assist you in diagnosing the problem. For additional help, consult the "Troubleshooting" section of this manual or call the factory. 7. If you wish to set the correct time and date, press the Computer key and select choice "3. Time, Date, Battery". Then select choices 1 & 2 as shown on the flowchart on page 12. 8. If the AVOXimeter 1000E passes the self-test and the daily quality-control check (page 31), it is ready to analyze blood samples. 9. You may turn the AVOXimeter off by selecting "4. Turn Off" under the Main Menu. The AVOXimeter may also be turned off by pressing the Cancel and Main Menu keys simultaneously.



Getting started (Continued) Sample Collection

1. The National Committee for Clinical Laboratory Standards (NCCLS) states that blood samples for blood gas measurements can be collected and kept in plastic syringes for up to 30 minutes at room temperature. If longer storage times are necessary, the NCCLS recommends glass syringes on ice (page 10 of C46-A; also see H18-A2). The AVOXimeter can analyze 6 samples per minute, so there is usually no need to store the samples before analyzing them. 2. Sodium or lithium heparinate and EDTA are the anticoagulants of choice. Citrate is known to change the pH of the blood and cause errors in spectrophotometric measurements. Similarly, fluoride/oxalate should be avoided. Anticoagulants are not necessary if the sample is analyzed immediately after it is drawn and in less than one minute after the cuvette is filled (Bailey, et al., J Clin Monit Comput 1997;13: 191-8.). If an anticoagulant is placed into the collection syringe, be aware that excessive volumes of anticoagulant can cause dilution errors. 3. When drawing blood samples from a saline-filled catheter, withdraw the saline first and make sure that only whole blood is sampled. Allowing the sample to be diluted with saline could possibly oxygenate the sample and will definitely induce dilution errors in the measurement of total hemoglobin concentration. 4. Keep each syringe containing a blood sample tightly sealed, and roll the syringe between your palms to keep the red blood cells and plasma well mixed. 5. To fill a cuvette, attach a disposable cuvette to the luer tip of the syringe. Point the cuvette downward at a 45° angle and observe the sample chamber in the cuvette. Press the plunger gently and fill the cuvette. Stop injecting the sample as soon as blood reaches the vent patch. CAUTION: Never insert a bloody or dirty cuvette into the instrument. If a cuvette does not fill easily, discard that cuvette and use another one. 6. Leave the syringe attached to the cuvette, and insert the cuvette into the instrument. 7. Remove the cuvette from the instrument as soon as the analysis is complete. Do not leave the cuvette in the oximeter. Although the results disappear from the display when the cuvette is withdrawn, the AVOXimeter stores the results of 100 analyses*. The data are saved permanently, until the 100th sample; then the stored data are replaced beginning with the oldest sample. Stored data can be erased from memory by pressing the Main Menu key, selecting choice “3. Stored Data” , then choice “3. Purge All Data”. See “Screens under Main Menu Key”, page 11. *Newer circuit boards store readings from 500 samples in memory.



Routine Analysis of Blood Samples 1. Turn on the AVOXimeter by pressing the Enter/On key and confirm that the self-test was successful. The instrument indicates that it is ready to analyze samples by displaying the following message:

- - - READY SCREEN

R E A D Y

I n s e r t P t.

-

- -

C u v e t

t e

I D :

U s e r I

D :

N o n e N o n e

2. Using appropriate precautions for handling possibly infectious blood, draw a fresh blood sample into a heparinized, plastic syringe. 3. NEVER INJECT BLOOD INTO THE INSTRUMENT ITSELF. Attach a disposable cuvette to the luer tip of the syringe, and inject the blood into the cuvette following the directions on page 9. 4. Observing the cuvette closely, make sure that the light path at the widest portion of the sample chamber is completely filled with blood and that blood reaches the air vent at the opposite end of the cuvette. Proper technique for filling cuvettes is shown on page 9. 5. If any blood is on the exterior surface of the cuvette, wipe it off with gauze. 6. Leaving the syringe attached to the cuvette, and holding the cuvette firmly by its black cap, insert the cuvette into the slot in the front panel of the instrument. 7. Observe the LCD display. Do not disturb the AVOXimeter while it is busy. Within 10 seconds the results will be shown like this:

RESULTS SCREEN

S

a

m p l

e

# 1

%H b O 2

=

9 7 .

0 %

[ O 2 ]

=

1 9 .

8 ml

/

[ T H b ]

=

1 5 .

1 g /

d l

d l

Withdraw the cuvette as soon as the sample has been analyzed. Data will stay on the display until the cuvette is removed. Data will also stay in non-volatile memory. 8. To analyze the next sample, discard the previously used cuvette, obtain a fresh cuvette from the box next to the instrument, and repeat the previous  seven steps.

Correct Cuvette Technique

Hold cuvette by black cap Bubble here is OK

Light Path Vent patch

Side View (Do not let patch bulge)

1. Connect blood-filled, plastic syringe to a new disposable cuvette. 2. Hold cuvette downward at a 45° angle and express blood into cuvette until sample fills cuvette up to the vent patch at the opposite end. CAUTION: Never force blood into cuvette. If cuvette does not fill easily, discard it and use another one. 3. Confirm that the light path at the widest portion of the sample chamber is free of debris or air bubbles. Ignore bubbles outside of the light path. 4. Remove any blood on cuvette's exterior surface before inserting cuvette into the AVOXimeter. Do not overpressure the cuvette or cause the vent patch to bulge outward. 5. Using the black cap as a convenient handle, insert cuvette into front panel slot on the instrument. Do not depress plunger while syringe is in the instrument. 6. After the AVOXimeter reports the results of the sample, withdraw cuvette and dispose of it. 7. Do not leave the cuvette in the instrument. 8. Always keep cuvettes in sealed bag with desiccant. 

Using the keypad, menus and other functions Data Entry

Keypad

Special Function Keys

The routine analysis of blood samples does not require the operator to use the numeric keypad. However, the keypad enables the operator to take advantage of many useful features. To select choices from a menu, press the appropriate number key and then the Enter key (3). To give the AVOXimeter data for calibration, press the appropriate number keys: each time a number key is pressed, that number appears on the display. If you make a mistake when entering a number, simply press the backspace (<-) key (4) to erase the erroneous digit, and enter the correct one. When the complete number has been entered, press Enter. If you reach a menu and then decide that you do not want to make a selection from it, the Cancel key (8) returns to the previous menu or to the normal mode for analyzing samples. To answer a query, use the Yes/+ key (7) or the No/- key (6).

1

2

3

Cancel

8

4

5

6

Yes +

7

7

8

9

No -

6

.

0

�

Print

5

Main Menu

Computer

Enter/On

1

2

3

4

Three keys have special functions. The Main Menu (1) and Computer (2) keys interrupt the normal sample analysis mode and display menus for access to other functions. These functions are outlined on pages 11-15. The Print (5) key sends sample results to an external printer. Pressing the Print key while viewing the READY screen sends the results of the last sample analyzed. For more on printing, 10

Screens Under MAIN MENU key Calibration Menu

Pres the MAIN MENU key

1

1. High HbO2 CalPt. L2 2. Low HbO2 CalPt. L1 3. Cuvette Pathlength 4. Hüfnerʼs# 1.30-1.39

Main Menu

1. Calibration 2. Printer Mode 3. Stored Data 4. Turn Off

Printer Mode Menu

Instructions: To make a selection from any menu, press the desired number and then the Enter/On key.

2

1. Auto Print ON/OFF 2. Print Stored Data 3. Printer Parameters 4. Print Opt. QC Only

ENTER TO RECALIBRATE

2

Enter Pathlength of Cuvettes, Shown on Cuvette Box. = 109 microns

4

Hüfnerʼs Number 1.39 ml O2 / g Hb 1. OK 2. Enter New Value

1

2

4

Stored Data Menu

3

1. Select Sample # 2. Newest Sample 3. Purge All Data (+=Next; -=Previous)

WARNING: PRESS CANCEL IF LAST SAMPLE WAS NOT LEVEL 1 CONTROL. ENTER TO RECALIBRATE

3

3

Press Cancel to return to a previous menu.

Cannot be selected without first consulting Technical Support (210) 695-8242 (800) 225-2869

WARNING: PRESS CANCEL

LAST SAMPLE WAS 1 IF NOT LEVEL 2 CONTROL.

1

2

Auto Print: OFF 1. OK 2. Turn ON Printing #216 Please Wait... CANCEL to Terminate

Baud Rate= 9600 Parity= NONE Data Bits = 8 (Fixed) Stop Bits = 1 (Fixed)

Printing # Please Wait... CANCEL to Terminate

Show Sample # ____ Valid Range: 117 to 216

Sample #216 %HbO2 = 97.0 % [O2] = 19.8ml/dl [T H b] = 15.1g/dl

Turn Off

***POWERING DOWN***

4

3

Erase All Data?[Y/N]

11

Screens under COMPUTER key

Press the Computer key

1.Pt Age, Ht,Wt,Sex 2.Oxygen Uptake Rate 3.Body Surface Area 4Show Sat Step-Ups↓+

1

A

Hemodynamics Menu

5Flow Calculations ↑6.Resistances 7.StrokeVolume, Index 8.Print Hemodynamics

(Continued on next page)

Computer Menu

1. Hemodynamics Menu 2. Device Settings 3. Time,Date,Battery 4. Data Management

Device Settings Menu

2

1.Display Brightness 2.Units 3.Standby Delay

1

1. Backlight OFF 2. Backlight LOW 3. Backlight MEDIUM 4. Backlight HIGH

tHb Units : g / dL

2

1. OK 2. Select mmol / L

3

Standby Delay in Minutes: ****60**** 1. OK 2. Enter New Value

1

(HHMM) Time: 0116 (24 hr) 1. OK 2. Enter New Value

2

(MMDDYY) Date: 083197 1. OK 2. Enter New Value

3

Battery High ENTER When Done.

Instructions: To make a selection from any menu, press the desired number and then the Enter/On key.

Time and Date Menu

3

1. Set & View Time 2. Set & View Date 3. Battery Status

Press Cancel to return to a previous menu.

Cannot be selected unless you are the QA User

Oximetry Sites: ON

Data Management Menu

4

1.Oxim. Sites ON/OFF 2.User & Patient ID 3.QC Lockout 4.Liquid QC Lot Nos.

1

1. OK 2. Turn OFF

B (See page 14)

2

1. Enter User ID 2. Enter Patient ID 3. Require User ID 4. Require Patient ID

QC Lockout: OFF

3

1. OK 2. Turn ON

C (See page 15)

D (See page 15)

4

Select Level: 1. Level 1 2. Level 2 3. Level 3

12

Screens under COMPUTER key (Cont'd)

Patient Height = inches

1

2

3

4

A 5

6

7

8

Patientʼs Age Age = Years

Patient Weight = pounds

1.Height:Inches 2.Height:Centimeters

1. Weight: Pounds 2. Weight: kg

RA-SVC = X.X RV-RA = X.X PA-RV = X.X ENTER For More...

PV-LA = X.X LA-LV = X.X LV-AO = X.X ENTER When Done...

1. Male 2. Female

Oxygen Uptake Rate = XXX ml / min

Body Surface Area BSA = X.XX m^2

Press ENTER to View Step-Ups for Pt. ID: XXXXXXX

1. Systemic Flow 2. Pulmonary Flow 3. Flow Ratio 4. Cardiac Index

1. Systemic Resist. 2. Pulmonary Resist.

1. Stroke Volume 2. Stroke Index

Printing ...

13

Screens under COMPUTER key (Cont'd) If Oximetry Sites are OFF

Oximetry Sites: ON

B

1. OK 2. Turn OFF If Oximetry Sites are ON

Sample #214 %HbO2 = 97.0 % [O2] = 19.8ml/dl [T H b] = 15.1g/dl

If you wish to turn on Oximetry Subsites

Sample #214 %HbO2 = 97.0 % [O2] = 19.8ml/dl Label Site? [ Y/N ]

If No, Results Display

1 AO 2APV 3ART 4IVC

5CS 9PAW 13SVC 6LA 10PV 14 UA 7LV 11RA 15 UV 8PA 12RV Site

1.

1. OK 2. Turn OFF

Sample #214 %HbO2 = 97.0 % [O2] = 19.8ml/dl [T H b] = 15.1g/dl

If Yes , screen displayed

Enter choice by number, then press Enter/On.

Oxim. Subites: ON

Aorta OK? [Y/N]

2Anomalous Pulm Vein OK? [Y/N]

3.Artery, Systemic OK? [Y/N]

4.Inferior Vena Cava OK? [Y/N]

5. Coronary Sinus OK? [Y/N]

Only if Oximetry Subsites are ON, will these options will be presented.

1.Ascending Aorta 2.Descending Aorta Subsite: No Subsites

1. Brachial Artery 2. Femoral Artery 3. Iliac 4. Renal Subsite: 1. High IVC 2. Low IVC Subsite: No Subsites

No Subsites

6.

Left Atrium OK? [Y/N]

7.

Left Ventricle OK? [Y/N]

1. Outflow 2. Inflow 3. Apex Subsite:

8.Pulmonary Artery OK? [Y/N]

1. Right 2. Main 3. Left Subsite:

9.Pulm Artery Wedge OK? [Y/N]

If you decide not to label Sites / Subsites after answeringYes, entering a Zero (0) will leave the Site / Subsite unlabeled.

1. Right 2. Left Subsite:

10. Pulmonary Vein OK? [Y/N]

1. Right 4.Left 2. RtUpper 5LeftUpper 3. RtLower 6LeftLower Subsite:

11. Right Atrium OK? [Y/N]

1.High 4Lateral Wall 2.Middle 5.Tricuspid 3.Low Subsite:

12. Right Ventricle OK? [Y/N]

1. Outflow 2. Inflow 3. Apex Subsite:

13Superior Vena Cava OK? [Y/N]

1. High 4. Innominate 2. Low 5. Jugular 3. PLSVC Subsite:

14. Umb. Artery OK? [Y/N]

15. Umb. Vein OK? [Y/N]

14

Screens under COMPUTER key (Cont'd)

2

1. Enter User ID 2. Enter Patient ID 3. Require User ID 4. Require Patient ID

C

1

Enter User ID: ***** XXXXXX ****** (Up to 9 digits: no leading zeroes)

2

Enter Patient ID: ***** XXXXXX ****** (Up to 9 digits: no leading zeroes)

3

4

5SER )$ /&&  /+  4URN /.

User ID: ***** XXXXXX ****** 1. OK 2. Enter New Value

ON

 2EVIEW$ELETE  !DD 5SER  0RINT 5SER ,IST  #HANGE 1! 5SER )$

2EQUIRE 0T )$ /&&  /+  4URN /.

Cannot be selected unless you are the QA User

3ET 1# ,OCKOUT $ELAY )N (OURS 

1# ,OCKOUT /.

3

 /+  4URN /&&

D Only QAUser can change this setting

When this message is displayed and you wish to change settings, you must return to Selection #2 [under Data Management Menu, p. 12] and enter the QA User's ID. Only when this is done, will the shaded screens be displayed. 15

Battery Power Tips on Battery Power

The AVOXimeter can be powered either from its internal batteries or from the wall transformer that serves as a battery charger or AC adapter. Furthermore, it can analyze blood samples and perform all of its other functions using either power source. You can even charge the batteries and analyze blood samples at the same time.

Standby Mode

To maximize the operating time from a battery charge, the AVOXimeter has several modes of operation. When the AVOXimeter is displaying its READY screen, it is in the Sample Analysis Mode. This is the usual mode of operation in which you analyze blood samples, use various menus, print stored data, and so forth. However, if you do not analyze any blood samples or press a key within a specified time, the AVOXimeter will go into Standby Mode to conserve its battery charge. Standby Mode draws very little power and thus extends the operating time from a battery charge. This mode allows you to minimize the drain on the batteries yet “wake up” the AVOXimeter so that it can quickly resume analyzing samples. You can adjust the Standby Delay from 10 to 180 minutes as follows: press the Computer key, select Device Settings, and finally select Standby Delay (see Screens under Computer key on page 12). The factory default value for the Standby Delay is 60 minutes (1 hour). Ordinarily, the AVOXimeter will not go into Standby Mode when you are analyzing samples or making menu selections or if the charger is connected. However, if the battery voltage is critically low, the AVOXimeter will immediately go into Standby Mode and will prompt you to plug in the charger. To come out of Standby Mode, hold down any key for approximately one full second.

Automatic Power The AVOXimeter will shut itself off completely if it has been in Standby Mode for 240 minutes (4 hours). You cannot adjust this Power Down Down Delay.

Getting the Most Use from a Battery Charge

If the batteries are fresh and fully charged, the AVOXimeter can analyze blood samples continuously for up to 8 hours when the display backlighting is set at medium brightness. However, the operating time per battery charge depends on a number of user-selectable factors. The following tips will help you maximize the number of samples that you can analyze from a single battery charge. 1)

Turning the display backlighting off will conserve battery energy and thus increase the operating time per battery charge. If the backlight is needed, the LOW backlight setting is the next best choice. Press the Computer key and select Device Settings to set the level of backlighting (see Screens under Computer key on page 12). 16

Battery Power (Cont'd)

Getting the Most 2) Use from a Battery Charge (Cont'd)

Battery Status and Voltage

Ni-Cad batteries suffer from a “memory effect” if they are charged before being completely discharged. To get the best use of the batteries, let them discharge completely before charging them. If a screen message says “Battery Critical - Connect Charger”, connect the charger and leave it connected for a minimum of 4 hours.

You can check the status of the battery by pressing the Computer key, then choice “3. Time, Date, Battery”, followed by choice “3. Battery Status” (see Computer key flowchart starting on page 12). The second and third lines of the display show a battery status message such as High, OK, Low, or Critical. These messages will help you to gauge when the batteries need to be charged. When the battery status becomes critical, the AVOXimeter will immediately go into Standby Mode and will prompt you to plug in the battery charger. Connect the charger and leave it connected for a minimum of 4 hours.

17

Data Management Setting Time & Date

If you wish to set the correct time and date, press the Computer key and select choice “3. Time, Date, Battery”. Then select choices 1 & 2 as shown in the flowchart on page 12 . If QC Lockout is turned on, only the Quality Assurance user (QA User) can change the time and date setting, but other users can view the current time and date.

Printing & Stored Selecting the Printer Mode option from the Main Menu displays the following menu: Data 1.Auto Print ON/OFF 2.Print Stored Data 3.Printer Parameters 4.Print Opt. QC Only

Auto Print

The AVOXimeter includes a feature to print results automatically following the analysis of each blood sample. Selecting the Auto Print ON/OFF option from the Printer Mode menu displays the current status. Press Cancel or select “OK” to leave the status as currently displayed, or change the status to the alternate value.

ON

When Auto Print is ON, the AVOXimeter automatically prints results to an external printer upon completion of sample analysis.

OFF

When Auto Print is OFF, the AVOXimeter prints results only when the Print key is pressed.

Print Stored Data

This function prints all results stored in memory, beginning with the most recent sample. Upon selection of the function, the display shows “Printing # XXXXXX”, where XXXXXX is the sample number currently printing. Press the Cancel key to stop printing. When Cancel is pressed before all samples have been printed, a message will be displayed stating that not all results have been printed.

Printer Parameters

This function configures the serial port for compatibility with an external printer. Both the baud rate and parity can be adjusted. However, the data bits are fixed at 8 and the stop bit(s) are fixed at 1. When “3.Printer Parameters” is selected from the Printer Mode menu, the currently defined baud rate and parity are displayed. Pressing Cancel leaves the values as currently displayed; changes can be made as described below. 18

Data Management (Continued) Baud Rate Enter/On Yes/+ No/-

The default baud rate is 9600 bps. The available baud rates are 110, 300, 600, 1200, 4800, 9600, and 19200 bps • leaves the baud rate as displayed and moves the cursor to the parity value. • displays the next available baud rate. • displays the previous available baud rate.

Parity

The default parity is NONE. The available parity options are NONE, EVEN, ODD.

Enter/On

• leaves the parity as displayed and presents a confirmation screen for both baud rate and parity values. • displays the next available parity value. • displays the previous available parity value.

Yes/+ No/Print Opt. QC Only

This function allows you to ignore the patient data stored in memory and to print out only the optical QC readings. The Stored Data function displays and prints results stored in memory. AVOXimeters can store 100 or 500 readings depending on the amount of memory installed on the circuit board. Upon selection of the Stored Data option from the Main Menu, the following menu is displayed:

Stored Data

1. Select Sample # 2. Newest Sample 3. Purge All Data (+= Next; -=Previous)

Select Sample #

This function allows reviewing and printing selected results by specifying the sample number. The AVOXimeter automatically increments the sample number by one for each new successful sample analysis. The sample number will increment to 999999 before it must be reset. Upon selection of this function, the AVOXimeter displays the currently available range of sample numbers.

Newest Sample

This function automatically displays results for the most recent successful sample analysis.

Yes/+ No/-

• displays results for the first (oldest) sample stored in the AVOXimeter. • displays results for the last (newest) sample stored in the AVOXimeter. • prints the results of the currently displayed sample to an external printer.

Print

19

Data Management (Continued) Scrolling Through Data

Once a sample has been selected for viewing, the Yes/+ (No/-) key will scroll through the stored data, incrementing (decrementing) the sample number by 1. Pressing Yes/+ (No/-) while viewing the newest (oldest) sample will display the oldest (newest) sample.

Result Display

The result display is the same as the display following sample analysis. However, because the result display does not provide information about the sample other than the results of the analysis, the Enter/On key toggles between two display modes: results and sample information. If the record is the reading on a blood sample, the display shows the following information: Line 1: Line 2: Line 3: Line 4:

Sample number and User number. Patient identification number. Abbreviated oximetry site, e.g. RA. Numerical codes for the oximetry site and subsite.

If the record is an optical or liquid QC reading, other appropriate information is shown. If a sample has the wrong site or subsite label, make certain that ‘Oximetry Sites’ are enabled (see p. 25); then press the Backspace key, while viewing the above sample information screen, to edit the site label for the presently displayed sample.

Printing From Stored Data Menu

To print the results of a previously analyzed sample, first call up the sample results from one of the selections described on p. 19 (e.g. “1. Select Sample #”). Then press the Print key. You may press the Print key when viewing either the results display or the sample information display.

User and Patient ID

To enter a user or patient identification number, press the Computer key (e.g. 4. Data Management, ‡ 2. User & Patient ID ‡ 1.Enter User ID) [see p. 12.] The User ID may have as many as nine digits, and the Patient ID may have as many as twelve digits. When either ID has been entered, it will be displayed on the READY screen. All samples analyzed will be assigned the currently displayed User and Patient IDs; this includes the case when an ID is displayed as “None”. To delete an existing ID and return to the “None” condition, press Enter when prompted for the ID. 20