Xerox EP03766 User Manual

Europaisches

European

Office

Patent

europeen

Patentamt

Office

brevets

des

©

Publication number:

376

0

A2

649

©

Application

©

Date of

©

Priority:

@

Date of

04.07.90

©

Designated

DE FR GB

number:

22.12.89

filing:

23.12.88

publication

Bulletin 90/27

US 290484

of

Contracting

EUROPEAN

89313517.8

application:

States:

PATENT

©

APPLICATION

A61M 16/18

Cl.s:

int.

Applicant: Hamm Moor

Weybridge

Inventor: Lancaster,

Station

34 Exeter

Inventor:

Lamb

36 Chagford

Inventor: Quick, 11 Forcefield

Cullompton

Representative: al BROOKES

52/54 London,

Dentsply

Road

Devon

Alderton,

Park

Devon(GB)

&

Holborn

High

WC1V

Lane Addlestone

Surrey

Topsham

EX3

William

Road

Devon

Woodcraft,

MARTIN

6SE(GB)

Limited

KT15

2SE(GB)

Adrian

ODS(GB)

W.

Peter

T.

EX15

1QB(GB)

High

Charles et

David

Holborn

House

device being

be side-by-side. follower cam

M

cam

<

activate interlocking devices

CO

vaporizers

CO

safety

r>

hose to

CO

Q.

anaesthetic

An

which

activated at

used

which is

follower

pins

is activated,

lock connector

an

vaporizer

is

provided prevents

one

with

any

interlock

The

adapted

used

connected

is

which

devices,

closed

in

a

anaesthesia

interlock

utilizes

than

The

of

device

be

to

activate

to

a pair

with

one

position.

is

having

received in

apparatus

which

more

time.

number

to

interact

when

thereby locking

which

apparatus.

system

a plurality

interlocking

an

one vaporizer

interlock

vaporizers

the

of

Also

used for

device

comprises

vaporizer.

cranks

of

on

pins

the

interlocking

all the

provided

connecting

and connector

of

from

can

mounted

a cam

rotating

a

The

which

adjacent

other

is

a

anaesthetic

for

40d 36

44

37/4I

80/

apparatus.

^3

47

38

48

46

Xerox

Copy

Centre

EP 0 376

649 A2

ANAESTHETIC

invention relates to

The and aesthesia machine

or connecting

Anaesthesia xolley on

nedical 3xide and Anaesthetic

soflurane

carrier

a nitrous-oxide the

liquid

chines vaporizers.

metered amount

a patient breathing vaporizers

that the

so series of

anaesthetic

lar more equipment

that connected

same various order to

operated patent

describe terlock specifications are

"plug-in"

fication

used

to

a

need for adapted

administration

able facturer, prises a

aesthesia,

the

to establish machines the

gas

dial by-pass, (where maining

particularly

more

tubing

equipment

which

such

gases

associated

agents

commonly

are

such

gas

through

anaesthetic

Conventional

commonly incorporate

Each

contain different

may

same

surgical

agent

than

more

time. In

interlock

specifications

arrangements

1385670,

system

gas

While the

vaporizers

valve

opening

flow

setting.

the

vaporizer on

one

does, however,

than

one

the

to

order

prevent

the

at

such

one

vaporizers

in

administration

vaporizer

a for

use

system.

construction

varies

the

most

canister

valve

means

the

vaporizer

include

may

of

a

in

the Part of the

without

anaesthetic

portion

of

VAPORIZER

to

vaporizers

to

an

mounted

are

as

pressure such

as

a vaporizer

agent.

anaesthesia

vaporizer

of anaesthesia

circuit

equipment can

operations

desired.

vaporizer

administration

gas

to

systems

more same

Nos.

interlock

described in these two

satisfactory

described in

there is at

for

use

circuit.

interlock

with

more

from manufacturer

common

including

and

for

adjusting

valve in the

vaporizer

entering

the

gas

INTERLOCK

anaesthesia

interlock

and

anaesthesia

typically

cylinders containing

oxygen,

as

administered

air

or

oxygen

apparatus

two

is

arranged

fresh

or

anaesthetic

to

supply

The

the

lead

to

could

with this

cope

have

than

one

time. For

2052271

system.

with the

least

connecting

There

system

than

of

commercially

type

reservoir

a

rotatable

a

the valve

concentration

a rotary

vaporizer

in accordance

flow

gas

the

vaporizer

is

located),

flow

passes

SYSTEM AND

machines

devices

locking

air and nitrous-

regulating

halothane

which

or more separate

vapor

gas

be

arrangement

same

the

accidentally

been

vaporizer

example,

U.K.

one

one type

of

vaporizer

dial

passes

for

devices

machine.

consists of

valves.

and

by passing

with

mixed

contains

ma-

or

to

dispense

into the

line. These

agents

used for

the

particu-

anaesthetic

possible

circuit at

problem,

proposed

being

U.K.

and 2193642

While the in-

patent

type

speci-

patent

other

widely

vaporizer

is,

which

dial

levels.

for

to

while the

units

therefore,

can

of

avail-

to

manu-

com-

of the

coupled

means

Such

adjusting

divide the

with the

through

chamber

through

an-

a

of

risk

be

the

in

of

be

gas

an-

to

re-

the

CONNECTOR FOR

vaporizer vapor. vapor

that

so concentration

5

the

gas

control of cams

interlock to

an

ro

is

opened particular from switch passing

is

outlet

lock

a

improved

20

two

lock apparatus

for anaesthetic

25

comprise tion into male such connectors and

30

(generally is made described sleeve

35

nectors can

severe

invention to

40

securing system connection

tional

lock

45

which, vents right

comprising

so

member lar,

member together

for

chamber for saturation

The

is then

the

gas

carrying

gas

line is effected

a separate

and

a pivoting

when the

setting

being

is

closed,

into the

of the

such

Many

between two

only

is

It

an object

interlock

plurality

or a The

present

hose connector

of the

a a

member.

international

Commonly

stainless

of

in GB-A-1 396096,

housed

One

problem

is accidental

be

appreciated,

problems.

connection

Accordingly,

system

activation of

on

activation

the

or

invention also

The

and

female

is

with

reception

ANAESTHETIC

which is

flow

gas

combined

leaves

of anaesthesia.

insure

and

rotated to

thereby

vaporizer

interlock

of

invention

invention. breathing systems,

tapered,

correspondingly

The size

standards.

the

metal

within

provide

but

allowing

for

use

of

of the

left

externally

an

connection

provided

the male

of the

with the

the

anaesthesia

an

by

on/off lever that

rotary to

prevent

any

vaporization

is closed.

systems vaporizers. this

of

system

vaporizers.

for

hollow

covered

are

male member

steel)

of

or

a plastic

which

can

disconnection

this

can give

is

It

an

hose connector

a

serving

for

disconnection.

and the invention

with

one

number

any

activated

provides a

internally

member

with

member, an

of the female member,

end

vaporizer

are provided

the outlet

setting

precluding

invention which

also relates

use

Typical

male member

and

plastic

to

a plurality

tapered

tapered,

APPARATUS

anaestnesia

by

saturated with the

by-pass

carrying a

introduction of

The

into the

vapor

valve

outlet

adjusted

the

when the

chamber

provide

can

with the

hose

internally

degree by

is

the female

comprise a

may

housing.

occur

rise

object

prevent

comprises

of the

of

vaporizers

vaporizer.

male

in which the

collar

A

pair

to

of the

adjustment

any gas

to

provide an

be

to anaesthetic

connectors

for

tapered of

various

made of

material

with and,

to

the

of

accidental

and

rapid

of

vaporizers,

hose connector

generally

which annular

switch.

dial is

simple

a

flow

gas

set

fresh

under the

of

rotary

as

serve

vaporizer

to

any dial

on/off

from

when the

inter-

an

used with

safety

a

example,

inser-

for

fe-

of

taper

national

metal

member

as

or,

metal

such

con-

clearly

potentially

vaporizers

connection

as

present

having a

dis-

inten-

inter-

an

pre-

the

to

tubu-

male

defines,

recess

and

2

:P

376 649

0

A2

wall of the

inner

he

least

it

of the collar

snd

female

he sxternal

the

n

The

jaratus

by means

us

An

'aporizers )f

vapor

said

sach

means

:am he

vapor

;iated Jevice vhen nterlock device

sngages said

cam

stantially

otatable

said

sprung sliding laving a which distal end

in

slot sliding

contact

:ing

nactivated, abutting sliding

by

ers, cooperate ment

the

of ment

its

of the

vaporizer tion, followers ciated

means

The

the

ing ingly, be

easily

tus.

The

platform

a

mounting circuit. nection

sealing mounting which

helical

one

member

or

lugs

collar.

invention

which hose

in

of the connector

anaesthesia

for

into

a

vaporizer

for

concentration

with each

which

prevents

another of

notch

a

follower

Z

shaped

about

crank

second

bar;

a

end

first

is rotatable

said second

of

second

a

bars

having

with

and

contact

bar

on

action

with each

means

cam

followers

cam

with its

while

associated

such

in

position

notch to

closed.

invention

interlock

the

installed

vaporizer

portion

.block

Ports

are

the

with

the

ports

block.

is

adapted

collar

defining

groove

towards

pins

also

introducing

flow

gas

comprises

opening

vaporizer

the

comprises

in the

comprising

first

a

being

impinging

about

sliding

inboard

each other

outboard

with the

adjacent

the cranks

with

of the

adjustment

establish

and

rotation

lock

also

device

on

body

for

provided

interior

The

to

extending

fixed

the

is

provided

for

engaging

provides

connected

is

of the

machine

vaporizers

(first)

substantially

other

can

in

its

which is

connection to

to corresponding ports

mounting

plug

having a

metered

a

when

opened

rotatable

the

vaporizer,

introduced

is

an

activation

a cam

rotatable

sprung

fixed

pin,

engaged

on

second

a

crank

said first

bar;

ends

when the

ends

outboard

vaporizers.

that

so

vaporizers

moved out

be

notch

cam

any

locks

engagement

associated

provides

the

on

demountable

is

existing

is

preferably

adapted

the

in

the

of

into

a

the

recess

from

end thereof:

with

one

with the

anaesthetic

an

the

to

invention.

plurality

concentration

is

adjustment

establishing

thereby.

improved

the

of

is activated.

follower

adjustment

end

one

crank

distal end

the

in

slot

a

T

shaped

said

sprung

fixed

engaged

being

and

which

vaporizer

which

ends

The

cam

the

and

by

anaesthetic

block

sliding

when

closed,

are

the

mere

means

vapor

all the

with

adjustment

means

apparatus.

provided

to

the

platform

vaporizer

may

supply

gas

has

free

the

and

or more

groove

ap-

appara-

provided,

Asso-

interlock

vaporizer

The

which

cam,

sub-

of

a

which is

in

first

a

crank crank

the

pin,

in

second

abut-

have

may

similar

of

a

follow-

bars

the

adjust-

one

of

engage-

rotation

to

open concentra- other

cam

its

asso-

cam

for mount-

Accord-

and

may

appara-

with

receive

supply

gas

for

con-

and

in

unit

be

a

in

bar

of

a

is

for

the

imilar

ication nay

cr parts lirectly

5

Also rine levice nachine. :omprises a

ro

ittached 1 bayonet

said

0

a locking

ng :ollar,

75

affixed to

ug he connector

east Jimensions

20

25

30

35

40

50

a

55

a

on

ug

The

existing

0

aesthesia

ment anaesthesia

/aporizers supply

connected to taper

vaporizer the

rear

tem

working parts vaporizer

system system vaporizer.

of the

split

a

ing

chine vaporizers

to that aescriDea

way

1385670. Alternatively,

incorporate

to

provided

of the

for

split

breathing

said

one

said

split

FIG.

FIG. 2 is

having

FIG.

bar

FIG. 2b

connections.

FIG. 2c

quarter,

FIG.

associated

FIG. 4

FIG.

of

FIG.

of of

FIG. 7 invention. FIG.

collar

FIG.

breathing

Referring

10

conventional

that the

so

a

gas

invention

connecting

The

male

collar

type

female

locking

suitable to

female connector.

collar

anaesthetic

is

1

machine.

three

machine.

2a is

mounted

of

an

a

similar

3 is

is

activated.

is

5

an

vaporizer

a

6 illustrates

an

vaporizer

a

illustrates

8

the

of

9

of the

12.

vaporizer

supply

for

use

quick

tapered

attached to

female

tube,

adapted

ring

connector

its

outer

mouth,

groove

is

adapted

front

a

illustration

an

side

plan

a

in

anaesthetic

side

is

a

supply

gas

is

perspective

a

that shown

to

without

but

illustration

an

each

with

illustration

an

in

the

illustrates

activated

illustrates

invention.

illustrates

tube to

to

now

invention is

apparatus.

in u.rv raiem

the

mounting tubular

taper

be

may

circuit.

with the

is

a quick

hoses

connect locking

locking

said

circumference

said

at

accommodate

elevational

by

view

plug-in

elevation

line

vaporizer.

interlock

the

vaporizer on

the

to

the

vaporizer

the

to

end

an

side,

a

locking

a

said

FIG. 1

anaesthetic connect the

to

connector

said

apparatus,

connector

female connector

to

engage

having

collar

split

precise

a

be

to

easily

view

of

sharing

side

vaporizers

showing a

fashion

machine.

of

having

view

in

Figure

interlock

an

of

an

the

of

position

system

of the

affect

of said

right

of the

affect

on

of said

left

of

view

cutaway

device

anaesthetic

anaesthesia

an

illustrated

speci-

block

connec-

connected

ma-

locking

anaesthetic

connector

having an

attached

hav-

said

split

least

at

adjacent

having

angle

least

at

attached

of

an an-

embodi-

an

on

pair

on a

vaporizer

one

conventional

of

a single

from

2b,

unit.

interlock

of the

when

interlock interlock

the

activated

interlock

the

activated

collar

split

a

view

for attach-

machine.

having

and

one

to at

and

one

an

of

gas

sys-

the

of

ma-

two

a

5

EP 0 376 649

A2

>

With reference /aporizers nore

carticular to comprises vaporizers

:ashion scribed in

tubular supply recesses are vaporizers

bar

the

in mitted into 22 of the

passed, together izer, This Patents

are soon impossible vaporizer. unit 8 izer. Interlock are arranged pin Thus vaporizer on the and tion.

includes notch of

vaporizer

direct independent erating

demountable stalled for

gas.

diecast which is the tially mechanism

housing,

the

block, connection

connector

12

than two

Referring

on

British Patent

As described

ports bar 84

in

located in their

may

84

by rotating left-hand

the

through

arrangement

1385670 and 2052271

In accordance

also

provided

as one

The interlock

forming a

9

10

or

in the

carrier

With reference

connecting

gas

turning

a

24 in

contact

mechanism

between

Interlock

housing

screwed

vaporizer.

independent

it

vaporizer

whether

96 is

now

is illustrated

vaporizers

to

now

FIGS. 2a and

a

supply

gas

in the

4a and

and

housing

a

locked in

be

the

vaporizer.

vaporizers by rotating

vaporizers

with

4b into the

port

is

with the

with

of the

admit carrier

to

web-like

units 8 include

to

come

soon as one

as

arrangement the left-hand

by

the

cam

follower

cam

a rotating

Because

12. with the

of the remainder

separate

the

unit

holding

or

Because

and

occupies

conveniently

can

body

of the

In

type.

of the

FIG

to

are

FIGS.

which

Specification

above-mentioned

4b

are received in

are

5. When the

corresponding recesses,

knob 6

whereupon

carrier

essentially

an

vaporizers

mechanism

enclosure

into contact

pressing

dial 22

to

now

cam forming part

rotating

and

can

unit

vaporizer

8

conveniently

the

otherwise

the

of

and

plug-in type

FIGS. 2b

taper

the

2,

relationship

embodiment

in

an

used.

and

2b

2, 2a,

the

2b,

mounted in

are

bar 84

Carrier

invention,

interlock unit

shown

side has

FIG.

26 which

the

of the kind de-

2052271

upstanding on

corresponding

ports

position on

the

to

position

gas

vapor

from the

gas

supply

gas

described in

the

is

operated,

to

gas

is located in

on

9 and

pins

with

vaporizer

in

Figure

been

release button

the

in

clockwise

a

interlock unit 8

2b,

engages

interlock unit 8

22,

cam of the

be made

thus

and

conveniently

the

and

to

supply

a

consists

actuating

fixed

to

interlock

only a

be

carrier

joint

unit is

vaporizer

installed between

gas

or

and

2c,

type

arrangement

the

can

the

whereby

an

each

an adjoining

is

it is

vaporizer

connector

mechanism

the

thin

of

in

and consists

of

where

and in

2c,

plug-in

Patent,

the

gas

4a and

vaporizers

opened

4b

the

supply

shown

be ad-

dial

cam

will be

vapor-

bar 84.

U.K.

as

it is

adjoining

vapor-

10 which

operated.

the

2a,

92

direc-

in

22

of dial

makes largely

op-

as a

in- 96

carrier

of

body

essen-

operating

web-like

mounting

the

taper-

the

fact,

to

of

a responding body

100

nection to

5

stage

which

connection

96.

to

vaporizer

concentration

a gas.

aesthetic

106.

is

aesthetic

12a, struction ment

20

canister

a be

same concentration

each of the

25

the

of

30

35

40

45

so

55

22. As

generally

outer

plural

the

The

21

setting

zero

21,

plate

introduce

to

circuit level dial 22 opposite

noted that spective

18.

of interlock

prises

which

of which

of

44 substantially sprung

retain rotates engaged

bars 36

and

a

member

body

connections

of the

vaporizer.

provided on

are

the

adjacent

in the

FIG. 2c

are generally

A

gauge

The

Sight

With

12b and

cam plate

dispensed

into the

vapor

can

surface

indicia 20

vapor

canister

indicate

to

as

mark

the

vaporizer

dial

52

established

is

With

Notch

substantially

is rotatable

which is

crank

cam

on

43, respectively

supply

gas

shows further

of the

102

is

open

of

vaporizer

the

to

in the

reference

coupled

to

notch

comprises cam

and

tray

tube

vaporizer.

12c is

dial

14

containing

and the gas

the anaesthesia

of

vaporizers

concentration

be

seen,

disk-shaped

18. engraved

concentration

14 includes

the

lished

estab

of indicia

counter-clockwise

22

vaporized

FIGS. 1

(See

displayed by

pointer

reference

each

24 in its circular

24 is

adapted

device

engaged

T

shaped

32

follower

fixed

in slot

46 which

having

vaporizer

shows the

and

anaesthetic

108 shows

to

The

is closed.

by

21

cam plate

around fixed

at

47 of

ports aligned

in

a platform part

Tapered

the

mounting

vaporizer

circuit.

features

conventional but

to

degree

is

normally

filled

is

FIG. 3 each of the

of conventional

a

22. Each

line 100

particular

20 is

the

.

now

80. Interlock Z

contact

30,

by

and

104

vapor

the means

is determined

adjusting

each

cam

member

outer

thereon

provided

arrow or

an

the

by

aligned

The rotation

into

gas

and

setting

indicium

the

FIGS 3

to

dial

receive

to

shaped

follower

in slot 37

34 which

crank

in notch

26

distal end 48 of

sliding

comprise

which have

tubular connectors

the

calibrated to

agent

adding liquid

operating

the amount

concentration

vaporizer

anaesthesia

for

of machine

vapor

plate

having a

surface

corresponding

by

vapor

vaporizer.

opens

patient

a

The

9). of the

22

peripheral

sprung

26,

of

point

bar

inboard ends 41 an abutting

with

98 of the

for

block

the next

to

or

of the

vaporizer

indicates the

mounting

which

by

carrier

in the

stopcock

of

vaporizers

internal

adjust-

comprises

vapor

metering

10. The

provided

the

by

cam plate

pointer

with the

- 6, includes

cam

device 80

28,

sliding

39,

24,

46;

setting

22

dial

circular,

include

18

the

vaporizer.

concentration

When

of the

the

vaporizer breathing

concentration

cam

20

disposed

it will be

surface

follower 26

crank

the first

and distal end

bar

impinges

helping

and

which is

and

cor-

con-

block

the

give

an-

con-

to

the

by

dial

is

to

indicia

the

arrow

cam

plate

a re-

com-

32,

end

36;

on

to

which

sliding

rela-

a

4

P 0 376

649

onship ondition,

rtiich

aporizers,

nds

nd

liased into

14.

ialanced rest

nd 46 neans ne iroper

/ith

lustrated irovided idjustable he ipectively. ocation :am

ind ween

ind slide jnd 48 jar nanner

he

ror nove

without

arly, :o sxertingany

when it

ster 12, the out illustration, vaporizer when eled 26b bottom the 32b rotates causes forcing

downward stantially

30b distal

move

system

when

outboard

may

44 and

T

shaped

Springs

may

associated

sliding

abutting

the

sliding

embodiment

on

extensions

outboard

into

22 of

dial

the

In

46

are

crank

bar 46,

slide

46.

bar

of crank

and

36

that

cranks

example,

the

to

exerting

when

the left,

In the

is desired

the

desired

notch

of

12b

cam

edge

slide out

to

surface

movement

distal

sliding

T-shaped

counter-clockwise

in

a

end

the

to

reference

With

80a

and

Cam

controls

motion

48b,

associated

the

similar

abut

slots 37

48

respectively

crank

the

position

and

110

position

optionally

therewith

bars

may

relationship

bars

inboard

ends

follower

out

or

associated

an

illustrated

spring

and

32

and between

Distal

34

47 of slide

slot

ensures

when

crank

right,

any

crank 32

crank

force

on

operation

operator

position,

24

(See

assumed that

it is

(See Fig.

is

22b

56b of

notch

23b

of

cam

clockwise

44b to

end

bar

of

and

right.

associated

vaporizer

ends 40

30

112

for

of

end

40a and

of

a

embodiment,

loaded

slide

end

are

that

the

crank

force

causes

34

slide

of

to

merely

which

rotated

of

36b to

cam

crank

consequently

now

and

sliding

and

respectively.

shown

have

be

adjacent vaporizers.

adjustable

41 of

sliding

respective

44 of

engaged

movement

32

moves

activate

FIG.

2).

24b

notch

cam

follower 26b,

on

with

bars

47 for

of

if

provided

are

crank 34.

a length

which

by

adjusted

with each

sliding 42a bars

26 is

adapted

vaporizer

maintain

to

bar

the motion

34

anaesthetic

between

36,

crank 32

46

bar

causes

moves

slide bar

on

slide bar

in

46.

bar

an

turns

forces

4).

the

Referring counter-clockwise,

permits

24b and

dial

fixed

to

move

left.

the follower 34b to

motion,

FIG.

to

vaporizer

in

is

an

42

respectively

adjacent

on

receiving

sprung

Fig.

slide bar

in slot

For

operator

22b. Because

rotate

sliding

crank

Crank

3

by spring

to

assure

Sliding

extension

are

36

notch

respectively

of the

slot 47

anaesthetic

cam

the

26b

5,

bars 36

adjustment

the

length

to

ensure

other

bar

36,

provided

and 46

for

24 in

12.

slide bars

tension

crank

36

and

37 of

of

only one

slide bar.

bar

slide

in slot

right

36.

36

to

without

machine 10,

dial

cam

follower

purposes

activates

FIG.

to

now

follower

cam

slide

sprung

28b

left, thereby

Similarly,

causes

fixed

on

which

causes

bar

interlock

the

12a to

In the

on

distal

32

32 is

a

of

a

and

is

38

and

on

re-

recip-

the

36

be-

34

and

distal

slide

in

of

46

to

37

Simi-

move

can-

22

to

26

of

4,

bev-

under

of

crank

which

the

sub-

46b to

the

ot

ngnt lock,

locked the which

i

clockwise 26a relationship ers

removed

o

returns

and vaporizer

vaporizer

5

ner

the condition

case

o

in movement the T-shaped wise

!5

to forcing

10

J5

to

45

so

55

lower

long displaced cannot follower

left has

may

invention porizers.

vaporizers system equipment. of the and to

recess member action, of web-like the unit mount

ment

cordingly,

on

invention tor

a

vaporizer

preventing

because

right,

causes

to

push

each

to

Because

46a

as vaporizer

In

a slightly

left of

of

vaporizer

cam

leftward movement

direction

push

cam

26c

as

return

26b

The

the

be to

Accordingly,

The

when

vaporizer

provide

which is

the

vaporizer

top

may

the

or

existing

With

which

the movement

caused

from

notch

to

that

12a

when

dial

against

sliding

motion

can

invention

of

space

part

be

without

by

sprung

fixed

on

further into

of

sliding

other, cam

notch

24b.

of the

the

right,

could theoretically

affected

is

12a.

different

vaporizer

22c takes

of

sliding

34c

crank

on

follower

cannot

bars

condition,

to returned to

is

of

exact

left of

the

interlock

be

may

mounted side-by-side

It is

only

housing

the

interlock

the

interlock

between

of the

replaced

vaporizer

providing

interlock

the

anaesthetic

reference

also

provides

prevents

uaustss

i<iu,

its

operation.

motion

the

crank

28a,

notch

bars

follower

24a

movement

interlock

the

in

manner,

12b is locked

12b is

12c,

locking

place

36c

bars

of

rotate

to

fixed

32c at

crank

into notch

26c

removed

be

36c

and

sliding

their

original

slide bars

effect

same

vaporizer

interlock

the

any

the

has

readily

necessary

to

valve

capable

unit.

unit is

and

preferably

vaporizer

a

by

singly

unit

apparatus.

to

now

a safety

inadvertent

vctpun^ci

Vaporizer

of

sliding

of

sliding

32a

to

causes

24a. Because each

on

26a cannot

until

cam

slide

of

be to

exactly

sliding

30c,

and 46c

notch

advantage

adapted

accept operating

of

independent

the

spacer

an

the

vaporizer

in

turned

of

cam

when

and 46c,

bar 36c,

in

a

causing

contact

from

bars

position

24b.

and

36c

on

any

12c.

mechanism

desired

to

the

receiving

Apart

occupies

mounting

housing.

if

anaesthetic

in

interlock

be

can

FIGS 7

lock

disconnection

rotate

of the

system

counter-clock-

remain

number

to

modify

from

easily

-

i^a iu

12a is

36a

bar

bar 46b,

counter-

follower

cam

of the

vaporiz-

follower

bars

of

the

right

man-

same

12c, to

inactivated

an

In the

on.

follower

leftward

the

caused

causes

crank

39c,

point

Cam

24c.

24c

notch

in their

and

36c

until

46c

to

vaporizer

of

standard

that

interlock

an

anaesthetic

in

the

interlock

with

wheel

the

locking

inter-

this

of the rest

a

block and

The interlock

desired

is

it

equip-

feature.

installed

the

9,

present

hose

connec-

of

to

be

26b

36a

any

of

26c

by

34c

fol-

as

46c

cam

the

that

the

va-

top

unit

a

thin

to

Ac-

the