Datex-ohmeda 3770 User manual

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Datex-Ohmeda

3770/3775

Pulse

Oximeter

Service

Manual

o 8

66666566

o a

®

e e

@

の

O

Datex-Ohmeda

-

I

Not

for

continuous

use

6050-0004-915

Printed

in

USA

O

Datex-Ohmeda

3770/3775

Pulse

Oximeter

Service

Manual

important

This

manual

is

subject

to

periodic

review,

update,

and

revision.

Customers

are

cautioned

to

verify

that

the

manual’s

information

applies

to

the

software

and

hardware

present

in

the

equipment.

This

product

performs

as

described

in

this

manual,

and

in

accompanying

labels

and/or

inserts,

when

assembled,

operated,

maintained,

and

repaired

in

accordance

with

the

instructions

provided.

This

product

must

be

cleaned

and

checked

periodically.

Do

not

use

a

defective

product.

Parts

that

are

broken,

missing,

plainly

worn,

distorted,

or

contaminated

should

be

replaced

immediately.

If

repair

or

replacement

become

necessary,

call

or

write

to

request

service

advice

from

the

nearest

Ohmeda

Distribution

and

Service

Center

(inside

the

USA)

or

the

nearest

Ohmeda

representative

(outside

the

USA)—

information

is

listed

on

the

back

cover.

Do

not

repair

this

product

or

any

of

its

parts

other

than

in

accordance

with

written

instructions

provided

by

Ohmeda

and

by

Ohmeda-trained

personnel.

The

product

must

not

be

altered

without

the

prior

written

approval

of

Ohmeda’s

Safety

Department.

The

user

of

this

product

shall

have

the

sole

responsibility

for

any

malfunction

that

results

from

improper

use,

faulty

maintenance,

improper

repair,

unauthorized

service,

damage,

or

alteration

by

anyone

other

than

Ohmeda.

The

safety,

reliability,

and

performance

of

this

device

can only

be

assured

under

the

following

conditions:

‧

|f

the

device

has

been

used

according

to

the

accompanying

operating

instructions.

e

If

fittings,

extensions,

readjustments,

changes,

or

repairs

have been

carried

out

by

Ohmeda's

authorized

agents.

+

Battery

charger—if

it

is

used

in

buildings

that

have

ground

equalization

wiring

that

complies

with

relevant

IEC

or

local

standards

and

regulations

(ETL,

UL,

CSA,

PSi,

TUV,

etc.).

Trademark

acknowledgements

Ohmeda

is

a

registered

trademark

of

The

BOC

Group

ClipTip

and

FlexConnect

are

trademarks

of

Ohmeda,

Inc.

OxyLead

and

OxyTip

are

registered

trademarks

of

Ohmeda,

Inc.

Cidex

is

a

registered

trademark

of

Johnson

&

Johnson

Duracell

is

a

trademark

of

Duracell,

Inc.

Eveready

is

a

trademark

of

Eveready

Battery

Company,

Inc.

Formula

409

is

a

registered

trademark

of

Clorox

Company

Hewlet

Packard

is

a

registered

trademark

of

Hewlett-Packard

Co.

Kodak

is

a

trademark

of

Eastman

Kodak

Company

Panasonic

is

a

trademark

of

Panasonic

Industries,

Co.

Rayovac

and

Renewal

are

registered

trademarks

and

Reusable

Alkaline

is

a

trademark

of

Rayovac

Corporation

Top

Crest

is

a

trademark

of

Safeway,

Inc.

Windex

is

a

registered

trademark

of

The

Drackett

Company

Text

revised

April,

1997

©

1997

Ohmeda,

Inc.

All

rights

reserved.

Table

of

Contents

Table

of

Contents

1/Overview

11

Generaldeseription..............................

1-2

111

Oximetiy........................................

ss

1-2

General

theory

of

operation...

1-2

Calibration.......................................................

1-3

1.1.2

Functional

components

или

нии

1-4

1.2

Specifications...

1-5

1.2.1

@епега|............

iii

1-5

Elertromagnetic

effecis.......................................

1-5

1.2.2

ОхтееГ............

лилии

1-5

General...

neger

1-5

Dimensions

eeeee

eee

onen

1-5

POWET

ssnerregese

1-5

Circuitry

.ee

1-6

Visual

displays

and

indicators................................

1-6

Audio

indicators

(3775

onİy).................................

1-6

Environmental...

ee

nene

1-6

Öperating................................................

1-6

ÉS

(O

[=

PA

1-6

IEC

classifications

ooo

eee

nee

1-7

$р02...........

eee

ener

onen

ANN

1-7

Alarmlimits..............................................

1-7

Rang?........................................

nenene

ate

onen

1-7

Acccuracy..............................

eee

1-7

İnterfering

substances.............................................

1-7

Pulse

rate...

линии

1-7

1.2.3

Battery

packs

.ee

1-8

NiCd

rechargeable

battery

pack...

1-8

AAbatterypack...................................

emen

1-8

RecommendedbrandS...........................................

1-8

Environmenta—NiCdandAA...................................

1-8

η

μμ

μϱϱ”ϱϱϱ””-

1-9

StOrage

…..............................................................

1-9

1.3

Default

settings

none

one

a

eno

eee

1-9

14

Precautions

none

eee

een

1-10

141

\ММагпО$...........

cenni

1-10

1.4.2

Cautions........................................e

1-13

15

Cleaning

procedures

иене

1-14

1.5.1

Oximeter.….…...........................................

1-14

1.5.2

Durable

sensors.…..….........................

1-15

1.5.3

Battery

packs

and

battery

chargers.............................

1-15

3770/3775

Pulse

Oximeter

Service

Manual

Table

of

Contents

2/Messages

and

Troubleshooting

2.1

Messagesandconditions....................................................

2-2

3770/3775

Pulseoximeter...................................

mes

2-2

Printer...

ante

2-5

Battery

charger

monitoring

station...............................

2-6

Battery

charger

(single)...

2-8

3/Repair

Procedures

3.1

3.2

3.3

3.4

3.5

3.6

Repair

policy

and

procedure

...........................

nn

3-1

3.1.1

Obtaining

service...

3-2

3.1.2

Packaging

and

return

procedure..................................

3-2

Safety

procedures

rene

e

ete

t

nene

3-3

Inspecting

the

oximeter

and

replacing

partS...........................

3-3

3.3.1

Disassemblingtheoximeter.......................................

3-4

3.3.2

Replacing

parts...

3-4

3.3.3

Assemblingtheoximeter..........................................

3-5

Gheckingnormaloperation...............................................

3-6

Oximeter

assembly,

3775...

non

onen

3-7

3.5.1

Service

kits,

3775...

3-7

3.5.2

Assembly

parts,

3775........

iii

3-7

3.5.3

Assembiyillustration,

3779.......................................

3-8

Oximeter

assembly,

3770...

eres

3-10

3.6.1

Servicekits,377/0................................................

3-10

3.6.2

Assembiyparts,3770...............................................

3-10

3.6.3

Assembly

illustration,

3770

eee

3-11

4/Analog

Board

41

42

43

44

General

description...

4-1

Schematic

overview...

4-1

Analog

board

components...

4-3

Analog

board

layOUt

.......................

iii

4-5

Analog

board

schematic

(1

through

15).................................

4-6

5/Digital

Board

5.1

General

description…

せ

…

essere

La

5-1

5.2

Digital

board

components...

5-3

5.3

Digital

board

layout...

5-4

54

Digitalboardschematic(ithrough?)..............................

5-5

ii

3770/3775

Pulse

Oximeter

Service

Manual

0

© ©

©

e

©

0

©

© ©

©

© ©

©

0

©

ο

©

0

©

0

©

0

©

List

of

Figures

List

of

Figures

Figure

number

Description

Page

1-1

Signal

compOsite

iene

1-2

Extinction

vs.

wavelengih....................................................

1-3

System

block

diagram

nr

1-4

AA

battery

life

cycles...

1-8

3-1

Applying

sealant

to

the

top

DEZEl...........................................

3-5

3-2

Applying

sealant

to

the

bottom

bezel....................................

3-6

Oximeter

assembly

illustration,

3775...

3-8

Oximeter

assembly

illustration,

3770.................................

3-11

4-1

System

diagram.........................

rire

4-2

Analog

board

layout

.ee

4-5

Analog

board

schematic

(15)...

4-6

5-1

Digital

system

blockdiagram.............................................

5-2

Digital

board

layout...

ee

5-4

Digital

board

schematic

(7)...

5-5

3770/3775

Pulse

Oximeter

Service

Manual

iii

1/Overview

This

manual

contains

instructions

for

servicing

the

Ohmeda

3770

and

3775

Pulse

Oximeters.

Note:

The

NiCd

and

AA

battery

packs,

the

single-station

battery

charger,

and

the

Hewlett-Packard®

(HP)

printer

are

not

serviceable

accessories.

The

content

of

this

manual

assumes

you

are

familiar

with

how

the

unit

operates,

as

described

in

the

3770/3775

Oximeter

Operator’s

Manual.

General

maintenance

procedures

contained

in

that

manual,

such

as

how

to

replace

batteries

in

the

AA

battery

pack,

are

not

repeated

in

this

manual.

You'll

find

detailed

instructions

for

servicing

and

repairing

the

battery

charger

monitoring

station

in

the

Battery

Charger

Monitoring

Station

Service

Manual

(p/n

6050-0003-861).

If

you

need

to

replace

fuses

or

change

the

voltage

selection

for

the

monitoring

station,

refer

to

that

manual.

This

chapter

contains:

*

A

general

description

of

the

oximeter

and

its

functional

components.

e

Oximeter

and

battery

pack

specifications.

*

Precautions,

including

specific

warnings

and

cautions,

you

must

follow

when

servicing

the

oximeter.

e

Instructions

for

cleaning

the

oximeter,

durable

sensors,

battery

packs, and

battery

chargers.

Technical

competence

Only

trained and

competent

individuals

who

are

experienced

with

medical

devices

of

this

nature

should

perform

the

procedures

described

in

this

manual

to

maintain

or

repair

these

devices.

Use

only

genuine

replacement

parts,

manufactured

or

sold

by

Ohmeda,

for

all

repairs.

3770/3775

Pulse

Oximeter

Service

Manual

1-1

1/Overview

1.1

General

description

1.1.1

Oximetry

Two

models

of

the

oximeter

are

available:

the

3770

and

the

3775.

Both

oximeters

operate

on

power

supplied

by

a

battery

pack.

In

addition,

either

oximeter,

when

a

nickel-cadmium

(NiCd)

battery

pack

is

attached,

can

be

positioned

in

the

battery

charger

monitoring

station

and

operated

using

the

station’s

DC

(from

AC

mains)

power

supply.

The

3770

oximeter

is

designed

specifically

for

spot

checking

SpO2

and

pulse

rate.

It

has

no

alarms

or

user-definable

parameters

and

is

not

intended

for

continuous

monitoring.

The

3775

oximeter

is

a

full-featured

model

designed

for

spot

checking

in

addition

to

short-

and

long-term

continuous

SpO2

and

pulse

rate

monitoring.

This

model

can

print

trend

data,

through

an

infrared

link,

to

the

optional

Hewlett-

Packard®

(HP)

printer.

Note:

Throughout

this

manual,

components

and

features

available

on

both

oximeter

models

and

those

found

only

on

the

3775

oximeter

are

discussed.

If

you

are

working

on

the

3770,

references

to

components

specific

to

the

3775

do

not

apply.

General

theory

of

operation

The

oximeter

uses

a

patented,

two-wavelength

pulsatile

system—red

and

infrared

light—to

distinguish

between

oxygenated

(O,Hb)

and

reduced

(HHb)

hemoglobin,

each

of

which

absorbs

different

amounts

of

light

emitted

from

the

oximeter

sensor.

The

system

then

calculates

the

relative

percentage

of

these

two

constituents

and

SpO».

The

fractional

saturation

is

determined

by

dividing

the

oxyhemoglobin

by

the

total

hemoglobin,

represented

mathematically

as

O2Hb

HD

total

(i.e.,

the

percentage

of

the

total

amount

of

hemoglobin

carrying

oxygen).

Variable

absorption

(Due

to

arterial

pulse)

Arterial

blood

absorption

Venous

blood

absorption

Absorption

Other

tissue

absorption

Time

Figure

1-1.

Signal

composite

1-2

3770/3775

Pulse

Oximeter

Service

Manual

1/Overview

Arterial

blood

pulsation

at

the

test

site

modulates

the

oximeter

sensor’s

light.

Since

other

fluids

and

tissues

present

generally

don’t

pulsate,

they

don’t

modulate

the

light

passing

through

that

location.

The

reduction

of

light

energy

due

to

arterial

blood

flow

is

detected

and

isolated

by

using

the

pulsatile

portion

of

the

incoming

signal.

1

(Red)

(Infrared)

660nm

940nm

м

=

0

©

=

|

OX

ob

E

Sar

N

HHb

-2

1

[+

|

1.

|

1

1.

600

700

800

900

1000

Wavelength

(nm)

Figure

1-2.

Extinction

vs.

wavelength

The

sensor’s

photodetector

converts

the

light,

which

is

partially

absorbed

and

modulated

as

it

passes

through

the

tissue

sample,

into

an

electronic

signal.

Since

02Hb

and

HHb

allow

different

amounts

of

light

to

reach

the

photodetector

at

the

selected

wavelengths,

the

electronic

signal

varies

according

to

the

light

source

that

is

“on”

and

the

oxygenation

of

the

arterial

hemoglobin.

Analog

and

digital

signal

processing

then

converts

the

light-intensity

information

into

Sp02

and

pulse

rate

values

for

display

on

the

monitor.

Calibration

In

fractional

mode,

the

fractional

saturation

is

determined

by

dividing

the

oxyhemoglobin

by

the

total

hemoglobin,

represented

mathematically

as

Fractional

SpQ.

=

Ο2Η0

Hb

TOTAL

(i.e.,

the

percentage

of

the

total

amount

of

hemoglobin

carrying

oxygen).

The

calculation

of

SpO2

assumes

1.6%

carboxyhemoglobin

(COHb),

0.4%

methemoglobin

(MetHb),

and

no

other

pigments.

Appreciable

variation

from

these

values

will

influence

SpO>

accuracy.

These

values

are

based

on

the

Ohmeda

Pulse

Oximeter

Empirical

Calibration

Study.

3770/3775

Pulse

Oximeter

Service

Manual

1-3

1/Overview

1.1.2

Functional

components

Figure

1-3 illustrates

the

relationship

between

each

functional

component.

Power

Battery

pack/

Return

Battery

monitor

AC

adapter

Temperature

board

Digital

board

Analog

board

On/Off

>|

Power

supply

Digital

core

|-«t

—p

i

Signal

path

Sensor

Figure

1-3.

System

block

diagram

A

complete

oximetry

system

requires

a

digital

board

and

an

analog

board.

The

digital

board

provides

signal

acquisition,

numerical

processing,

and

user

interface

for

the

oximeter.

The

analog

board

amplifies

and

conditions

the

biological

signal.

The

digital

board

then

samples

the

conditioned

signal,

performs

the

oximetry

algorithm,

and

displays

the

results

on

numeric

and

graphic

LED

displays.

The

user

interface

features

an

eight-character

dot-addressable

LED

display,

a

24-segment

LED

driver,

a

variable

frequency

audio

driver,

and

(for

the

printer

option)

an

infrared

wireless

transmitter.

|

For

theories

of

operation

and

schematics,

refer

to

the

chapters

listed

below:

e

4/Analog

Board

・

5/Digital

Board

1-4

3770/3775

Pulse

Oximeter

Service

Manual

1/Overview

1.2

Specifications

Unless

otherwise

indicated,

all

specifications

are

nominal

and

are

subject

to

change

without

notice.

Unless

otherwise

indicated,

the

specifications

below

apply

to

both

oximeters.

1.2.1

General

The

3770

or

the

3775

when

used

with

a

LR6(AA)

battery

pack,

a

NiCd

battery

pack,

or

a

NiCd

battery

pack

in

a

battery

charger

monitoring

station

are

referred

to

as

the

“system”

for

EMC

purposes.

Electromagnetic

effects

Indications

that

the

system

is

experiencing

electromagnetic

interference

include

variations

in

the

display

(pleth

bar

does

not

correlate

to

physiological

signals),

sudden

increases

or

decreases

in

the

signal

strength

indicator

that

do

not

correlate

to

physiological

condition

of

the

patient,

PROBE?

messages

that

are

not

resolved

by

the

instructions

found

in

the

3770/3775

Oximeter

Operator's

Manual,

and

the

display

of

“rolling

dots”

when

a

valid

physiological

signal

is

present.

This

interference

may

be

intermittent

and

careful

correlation

between

the

effect

and

its

possible

source

is

important.

The

system

will

not

display

any

of

these

indications

if

it

is

used

within

its

intended

electromagnetic

environment.

Environment:

Suitable

for

use

in

the

environment

described

in

IEC

601-1-2.

EMC

performance:

The

system

complies

with

the

requirements

of

IEC

601-1-2

(Electromagnetic

compatibility

-

Requirements

and

tests).

The

following

basic

EMC

standards

were

applied

to

verify

conformance.

The

IEC

1000

series

replaces

the IEC

801

series

referenced

in

IEC

601-1-2.

Emissions:

CISPR

11

Group

I,

Class

B

Immunity:

IEC

1000-4-2,

8

kV

air,

3

kV

contact

IEC

1000-4-3,

3

V/m

IEC

1000-4-4,

2

kV

power,

1

kV

1/0

IEC

1000-4-5,

2

kV

line

to

earth,

1

kV

line

to

line

1.2.2

Oximeter

|

General

Dimensions

Height:

18.54

cm

(7.3

inches;

9.5

inches

including

FlexConnect™)

Width:

7.62

cm

(3.0

in.)

Depth:

5.33

cm

(2.1

in.)

Weight:

0.33

kg

(6

oz.)

without

battery

pack

Power

Typical

consumption:

1.6W

Typical

current:

180

mAmps

3770/3775

Pulse

Oximeter

Service

Manual

1-5

1/Overview

Circuitry

Microprocessor

controlled

Automatic

self-test

at

power

on

Automatic

setting

of

default

parameters

(3775

only)

Automatic

alarm

messages

Automatic/continuous

system

diagnostics

Visual

displays

and

indicators

Main

display:

8-character

alpha-numeric;

green;

variable

intensity

dependent

on

ambient

light

conditions

Waveform

display:

8

green

LEDs

Signal

strength

indicator

bar:

4

LEDs

(1

dark

green,

1

yellow

green,

1

yellow,

and

1

orange)

Low

battery

indicator:

1

orange

LED

Alarm

bar

(3775

only):

red

Display

update

interval:

0.5

seconds

Display

hold

interval:

12

seconds

Audio

indicators

(3775

only)

Alarm

volume:

On

(default)

and

off

Pulse

rate

volume:

On

and

off

(default)

Pitch

modulation

to

reflect

changing

SpO>

levels

Alarm

silence

(120

seconds)

Low-

and

high-Sp02

out-of-limits

alarm

Sensor

condition

alarms

System

failure

alarms

Environmental

Operating

Temperature:

0

to

50

°C

(32

to

122

°F)

Humidity:

0

to

95%

RH,

noncondensing

Atmospheric

pressure:

8

to

15.4

psia

(550

to

1,060

hPa)

Vibration:

Meets

or

exceeds—

ASTM

4728,

(Method

C)

MIL-STD-810E,

Method

514.4,

Section

1.3.4.3

IEC

68-2-37

Drop/shock:

Meets

or

exceeds—

IEC

68-2-32

(Procedure

1)

MIL-STD

810E,

Method

516.4,

Section

1.3.6

(Procedure

IV)

Storage

Temperature:

—40

to

70

°C

(-40

to

158

°F)

Humidity:

0

to

95%

RH,

noncondensing

Atmospheric

pressure:

7.2

to

15.4

psia

(496

to

1,060

hPa)

Vibration:

Meets

or

exceeds—

ASTM

4728,

(Method

C)

MIL-STD-810E,

Method

514.4,

Section

1.3.4.3

Drop/shock:

Meets

or

exceeds—

IEC

68-2-32

(Procedure

1)

MIL-STD

810E,

Method

516.4,

Section

1-3.6

(Procedure

IV)

16

3770/3775

Pulse

Oximeter

Service

Manual

1/Overview

International

Electrotechnical

Commission

classifications

Type

of

protection

against

electric

shock:

\nternally

powered

equipment/Class

il

Degree

of

protection

against

electric

shock:

Type

BF

Degree

of

protection

against

ingress

of

liquids:

Sprayproof

(IEC529-IPX3)

Mode

of

operation:

Continuous

Recommended

methods

of

sterilization

or

disinfection:

See

“Cleaning

procedures”

in

this

manual

and

appropriate

sections

of

the

Ohmeda

sensors’

user

instructions

for

recommended

procedures

for

cleaning

this

equipment.

Degree

of

safety

of

application

in

the

presence

of

a

flammable

anesthetic

mixed

with

air

or

with

oxygen

or

nitrous

oxide:

Equipment

not

suitable

for

use

in

the

presence

of

a

flammable

anesthetic

mixture

with

air

or

with

oxygen

or

nitrous

oxide.

8002

Alarm

limits

(3775

only)

Low

=

60

to

99%

High

=

60

to

100%

Range

0

to

100%

Accuracy

(1

standard

deviation)—fractional

calibration

90

to

100%

1.5%

80

to

89.9%

|

21%

60

to

100%

2.4%

Below

59.9%

unspecified

Interfering

substances

Carboxyhemoglobin

may

erroneously

increase

readings. The

level

of

increase

is

approximately

equal

to

the

amount

of

carboxyhemoglobin

present.

Dyes,

or

any

substances

containing

dyes,

that

change

usual

arterial

pigmentation

may

cause

.erroneous

readings.

Pulse

rate

Range

40

to

235

beats

per

minute

Accuracy

+1.7%

of

current

reading

(accuracy

calculations

assume

a

constant

pulse

rate)

3770/3775

Pulse

Oximeter

Service

Manual

1-7

1/Overview

1.2.3

Battery

packs

NiCd

rechargeable

battery

pack

Weight:

0.43

kg

(12.5

oz.)

Power:

9.6

V,

sealed

nickel-cadmium

(8

cells)

Capacity:

1.4

A-hours

Operation

time:

8

hours

Charge

time:

2

hours

Life

cycle:

1

year

(500

cycles)

Low

battery

indicator

LED

illuminates

when

battery

usage

time

is

at

or

below

~15

minutes.

AA

battery

pack

Weight:

0.12

kg

(4.4

oz.)

without

cells;

0.26

kg

(9.3

oz.)

with

cells.

Capacity,

operation

time,

charge

time,

and

life

cycle

depend

on

the

battery

cell

chosen.

Battery

type

Alkaline

8

to

15

hours

Rechargeable

alkaline

2.5

to

8

hours

Lithium

10

to

20

hours

Carbon

2

to

4.5

hours

Life

expectancy

in

hours

Figure

1-4.

AA

battery

life

cycles

Low

battery

indicator

LED

lights

depending

on the

battery

cell,

as

follows:

Alkaline

<2.5

hours

Alkaline

rechargeable

<1

hour

Lithium

<1

hour

Carbon

<2

hours

Recommended

brands:

Alkaline

Lithium

Carbon

Duracell

™

Eveready

Eveready™

Rayovac

Kodak™

Panasonic™

Rayovac®,

including

rechargeable

"Renewal®"

Top

Crest™

1-8

3770/3775

Pulse

Oximeter

Service

Manual

1/Overview

Environmental—NiCd

and

AA

Operating

Temperature:

0

to

50°

C

(32

to

122

°F)

—

NiCd

0

to

40°

C

(32

to

104

°F)

—

AA

Humidity:

0

to

95%

RH,

noncondensing

Atmospheric

pressure:

8

to

15.4

psia

(550

to

1,060

hPa)

Vibration:

Meets

or

exceeds—

ASTM

4728

(Method

C)

MIL-STD-810E, Method

514.4,

Section

1.3.4.3

IEC

68-2-37

Drop/shock:

Meets

or

exceeds—

IEC

68-2-32

(Procedure

1)

(NiCd)

MIL-STD

810E,

Method

516.4,

Section

1-3.6

(Procedure

IV)

Storage

Temperature:

—40

to

50

°C

(-40

to

+122

°F)

Humidity:

0

to

65%

RH

(+20%)

noncondensing

Atmospheric

pressure:

7.2

to

15.4

psia

(496

to

1,060

hPa)

Vibration:

Meets

or

exceeds—

ASTM

4728

(Method

C)

MIL-STD-810E,

Method

514.4,

Section

1.3.4.3

Drop:

Meets

or

exceeds—

IEC

68-2-32

(Procedure

1)

(NiCd)

MIL-STD

810E,

Method

516.4,

Section

1.3.6

(Procedure

IV)

1.3

Default

settings

Each

time

you

power

on

the

oximeter

the

following

system

default

settings

are

in

effect:

Low-SpO>

alarm

limit

=

85

High-Sp0

alarm

limit

=

On

Pulse

beat

volume

=

Off

Alarm

volume

=

On

SpO>

averaging

interval

=

12

seconds

Settings

for

time,

date,

and

language

are

retained

when

the

system

is

powered

off

as

long

as

a

battery

is in

place.

3770/3775

Pulse

Oximeter

Service

Manual

1-9

1/Overview

1.4

Precautions

Two

types

of

precautions

appear

in

this

manual:

warnings

and

cautions.

A

WARNING

indicates

a

potentially

harmful

situation

that

may

cause

injury

to

a

patient

or

operator.

A

CAUTION

indicates

a

condition

that

may

lead

to

equipment

damage

or

malfunction.

Read

this

section

fully

and

carefully

before using

or

servicing

the

oximeter

and

its

accessories.

1.4.1

Warnings

US

federal

and

Canadian

law

restrict

this

device

to

sale

by

or

on

the

order

of

a

licensed

medical

practitioner.

Handling

Handle

the

oximeter

and

its

accessories

with

care.

Improper

handling

can

cause

damage

or

inaccurate

operation

of

these

devices.

Failure

of

operation

If

the

oximeter

fails

to

respond

as

described

(see

“Checking

normal

operation”

in

chapter

3),

do

not

use

it

until

qualified

personnel

have

corrected

the

situation

or

the

unit

has

been

serviced.

It

is

possible

for

any

device

to

malfunction;

therefore,

it

is

the

responsibility

of

the

operator

to

verify

any

unusual

data

independently

by

doing

a

formal

patient

assessment.

Explosion

hazard

Do

not

use

the

oximeter,

the

printer,

or

the

battery

chargers

in

the

presence

of

flammable

anesthetics

or

other

flammable

substances

in

combination

with

air,

an

oxygen-enriched

environment,

or

nitrous

oxide.

Cadmium

is

a

hazardous

substance.

Dispose

of

a

battery

pack

through

an

approved

hazardous

material

disposal

facility

or

by

returning

it

to

Ohmeda

for

reclamation.

e

Do

not

dispose

of

a

NiCd

battery

pack

by

throwing

it

in

the

trash.

e

Do

not

incinerate

or

burn

the

NiCd

battery

pack.

Use

only

a

3770/3775

battery

pack

as

part

of

the

oximeter.

Use

only

an

Ohmeda

battery

charger

to

recharge

or

condition

an

Ohmeda

NiCd

battery pack.

Do

not

attempt

to

recharge

or

condition

a

NiCd

battery

pack

that

is

not

made

by

Ohmeda

in

an

Ohmeda

battery

charger.

Do

not

expose

a

battery

pack

to

any

temperature

that

is

hotter

than

you

can

tolerate

to

touch.

1-10

3770/3775

Pulse

Oximeter

Service

Manual

1/Overview

Electric

shock

hazard

An

operator

may

perform

only

the

maintenance

procedures

specifically

described

in

the

3770/3775

Oximeter

Operator's

Manual.

Only

qualified

service

personne!

who

are

trained

in

the

repair

of

this

equipment

should

perform

the

procedures

in

this

manual.

Do

not

attempt

to

repair

the

battery

packs,

the

printer,

or

the

single-station

battery

charger.

They

are

not

serviceable

parts.

The

battery

chargers

must

be

properly

grounded.

ο

Connect

this

equipment

only

to

a

three-wire,

grounded,

hospital-grade

receptacle.

The

three-connector

plug

must

be

inserted

into

a

properly

wired

three-wire

receptacle.

If

a

three-wire

receptacle

is

not

available,

a

qualified

electrician

must

install

one

in

accordance

with

the

governing

electrical

code.

e

Do

not

under

any

circumstances

remove

the

grounding

connector

from

the

power

plug.

e

Do

not

use

extension

cords

or

adapters

of

any

type.

The

power

cord

and

plug

must

be

intact

and

undamaged.

Electrical

shock

and

flammability

hazard

Before

cleaning

or

servicing

the

oximeter,

always

turn

it

off.

Before

cleaning

or

servicing

the

printer,

always

turn

it

off

and

disconnect

the

power

cord

from

the

AC

mains

power

supply.

Before

cleaning

or

servicing

the

battery

chargers,

always

disconnect

the

power

cord

from

the

AC

mains

power

supply.

Fire

hazard

To

protect

against

fire

hazard, replace

the

fuses

in

the

battery

charger

only

with

fuses

of

the

same

type

and

local

line

voltage

rating.

Patient

safety

Do

not,

under

any

circumstances,

perform

any

testing

or

maintenance

on

the

oximeter

when

it

is

being used

to

monitor

a

patient.

The

correct

use

of

the

oximeter

is

to

measure

only

arterial

oxygen

saturation

(SpO2)

and

pulse

rate.

e

A

pulse

oximeter

does

not

measure

respiration

and

under

no

circumstances

should

it

be

used

as

a

substitute

for

an

apnea

monitor.

e

The

oximeter

must

not

be

used

as

the

primary

monitor

for

infants

being

monitored

for

apnea,

either

in

the

hospital

or

in

the

home

setting.

It

measures

SpO2

and pulse

rate,

and

only

then

in

conjunction

with

other

appropriate

monitoring

techniques.

*

A

pulse

oximeter

is

often

used

during

sleep

studies

with

adults,

but

must

be

used

only

to

gather

information

regarding

Sp02

and

pulse

rate

during

these

studies.

'

e

A

pulse

oximeter

is

to

be

used

only

by

or

on

the

order

of

medically

trained

personnel.

3770/3775

Pulse

Oximeter

Service

Manual

1-11

1/Overview

This

device

is

not

intended

for

use

in

a

magnetic

resonance

imaging

(MRI)

environment.

When

the

unit

is

operating

on

battery

power

and

the

battery

becomes

depleted,

be

aware

that

no

alarm

tone

sounds

when

the

unit

shuts

off.

Patient

safety—sensors

If

a

sensor

is

damaged

in

any

way,

discontinue

use

of

that

sensor

immediately.

Prolonged

monitoring

or

patient

condition

may

require

periodically

changing

the

sensor

test

site.

To

reduce

the

risk

of

blistering,

skin

erosion,

or

ischemic

skin

necrosis,

change

the

sensor

site

as

specified

in

the

user

instructions

for

the

sensor

you

are

using.

If

any

evidence

of

the

above

conditions

appears

before

the

specified

period

of

time

(for

example,

discoloration

or

reddening),

change

the

site

immediately.

To

prevent

patient

injury

or

equipment

damage,

use only

Ohmeda

oximeter

sensors

approved

for

use

with

this

oximeter

(refer

to

the

3770/3775

Oximeter

Operator’s

Manual).

Refer

to

the

user

instructions

for

the

sensor

you

are

using

for

complete

information,

including

warnings,

cautions,

and

compatible

oximeter

connectors

for

that

sensor.

Patient

safety—printer

Do

not

use

the

printer

within

the

patient

environment

as

shown

below:

~

^

2.

.

一

1

И

x

1.5

m

(5

ft)

1.5

m

(5

ft)

~

一

7

Operator

safety

Do

not

handle

hot

or

leaking

battery

packs

or

batteries.

To

protect

yourself

from

possible

electric

discharge,

avoid

contact

with

the

unit’s

internal

components

while

performing

any

troubleshooting

or

repair

procedure

when

the

cover

of

the

unit

is

removed

and

the

unit

is

receiving

power.

Data

validity

To

prevent

erroneous

readings,

do

not

use

an

inflated

blood

pressure

cuff

on

the

same

limb

as

the

oximeter

sensor.

Excessive

ambient

light,

excessive

motion,

low

perfusion,

or

electrical

interference

at

the

sensor

site

can

result

in

the

display

of

invalid

SpO»

data.

3770/3775

Pulse

Oximeter

Service

Manual

1/Overview

1.4.2

Cautions

Since

printed

trend

data

include

the

current

date

and

time,

to

avoid

any

possibility

of

confusion

do

not

change

the

date

and/or

time

settings

while

collecting

trend

data.

Static

sensitivity

The

oximeter’s

electronic

components

are

susceptible

to

damage

by

electrostatic

discharge.

When

disassembling

the

unit.

e

Work

at

a

static-control

workstation

and

wear

a

static-control

wrist

strap

to

discharge

accumulated

static

charges

from

you

and

any

tool

you

use.

。

Use

static-safe

tools

(tools

with

conductive

or

dissipative

handles).

Observe

the

safety

precautions

associated

with

using

conductive

tools

in

a

high-voltage

environment.

e

Handle

circuit

boards

(replacement

and

defective)

by

their

nonconductive

edges.

Use

antistatic

containers

to

transport

them.

Battery

packs

To

prevent

battery-pack

damage:

e

Handle

battery

packs

with

care.

e

Never

attempt

to

take

a

battery

pack

apart.

Access

only

the

battery

compartment

for

replacing

batteries

in

the

AA

battery

pack.

e

Never

attempt

to

replace

a

cell

in

the

NiCd

battery

pack.

The

set

of

eight

cells are

matched

for

capacity

and

improper

operation

could

occur.

e

Do

not

put

a

battery

pack

where

it

can

be

short-circuited

by

contact

with

metal

objects,

such

as

in

a

pocket

with

keys.

e

Use

only

AA

batteries

recommended

by

Ohmeda

in

the

AA

battery

pack.

Cleaning

e

Do

not

autoclave,

pressure

sterilize,

or

gas

sterilize

the

oximeter,

the

printer,

the

battery

packs,

or

the

battery

chargers.

e

Do

not

immerse

the

oximeter,

the

battery

packs,

the

printer,

or

the

battery

chargers

in

liquid.

The

electronic

circuitry

can

be

short

circuited,

causing

permanent

damage.

+

Use

the

cleaning

solution

sparingly.

Excessive

solution

can

flow

into

the

device

and

cause

damage

to

internal

components.

+

Do

not

touch,

press,

or

rub

the

main

display

lens

with

abrasive

cleaning

compounds,

instruments,

brushes,

rough-surfaced

materials,

or

bring

it

into

contact

with

anything

that

could

scratch

the

panel.

e

Do

not

use

petroleum-based

solutions

or

solutions

containing

acetone,

ethanol,

freon,

trichloroethylene,

or

harsh

solvents

to

clean

the

oximeter,

the

printer,

the

battery

packs,

the

battery

chargers,

or

any

protective

covering

on

these

devices.

These

substances

attack

the

devices’

materials,

and

device

failure

may

result.

3770/3775

Pulse

Oximeter

Service

Manuat

1-13

1/Overview

When

cleaning

oximeter

sensors,

follow

all

warning

and

caution

statements

provided

in

the

sensor

user

instructions,

which

may

include:

e

Do

not

soak

or

immerse

the

sensor

in

any

liquid.

e

Do

not

autoclave

the

sensor.

*

Do

not

gas

sterilize

the

Flex

li

sensor

with

ethylene

oxide.

e

Disposable

sensors

are

intended

for

single-patient-use

only;

do not

attempt

to

clean

them

in

any

way.

Printer

To

avoid

damage

to

the

printer,

use only

an

AC

adapter

recommended

by

and

available

from

Ohmeda.

Sensors

Refer

to

the

user

instructions

for

the

sensor

you

are

using

for

complete

caution

information.

1.5

Cleaning

procedures

1.5.1

Oximeter

CAUTIONS:

*

Do

not

autoclave,

pressure

sterilize,

or

gas

sterilize

the

oximeter.

+

Do

not

immerse

the

oximeter

in

liquid.

The

electronic

circuitry

can

be

short

circuited,

causing

permanent

damage.

»

Use

the

cleaning

solution

sparingly.

Excessive

solution

can

flow

in

the

oximeter

and

cause

damage

to

internal

components.

»

Do

not

touch,

press,

or

rub

the

main

display

lens

with

abrasive

cleaning

compounds,

instruments,

brushes,

rough-surface

materials,

or

bring

it

into

contact

with

anything

that

could

scratch

the

panel.

*

Do

not

use

petroleum-based

solutions

or

solutions

containing

acetone,

ethanol,

freon,

trichloroethylene,

or

harsh

solvents

to

clean

the

oximeter.

These

substances

attack

the

device’s

materials,

and

device

failure

may

result.

To

clean

the

oximeter,

wipe

it

gently

with

a

soft

cloth

dampened

with

any

of

the

following

cleaning

agents:

Warm

water

Isopropyl

alcohol

Liquid

soap/mild

detergent

Cidex®

Mild

chlorine

bleach

solution

Windex®

Hydrogen

peroxide

solution

Formula

409®

Gluteraldehyde

(4%

or

less)

Never

use:

Acetone,

butyl

alcohol,

denatured

ethanol,

freon,

trichloroethyiene

3770/3775

Pulse

Oximeter

Service

Manual

Datex-Ohmeda 3770 User manual

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