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Патент USA US2406129

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AU8~ 20, 1946- '_
J. H. BLEAsE
ANESTHETI Z ING METER ING APPAÈATUS
_
_ Filed oct. 2a. 1943
_
2,406,129
Patented Aug. 20, 1946
2,406,129
UNITED STATE-s"? PATENT OFFICE 4
Application October 28, 1943, Serial No. 508,019
'
In Great Britain December 11, 1942
2 Claims.
( Cl. 73-198)
1
2
The present invention relates to improvements
in anesthetizing metering apparatus of the type
29 leading to the outlet 30 connecting with the
Y normal face mask or other anesthetizing device.
in which a ñow meter is provided having a
bypass, so that the rate of flow is in fact a func
The flow meter I8 and bypass I9 similarly com
municate with th‘e passage 3l leading to the con
nection 30. The vconnection 30 is coupled by a
tion of the scale indications, thereby allowing for
a more open scale to be available.
An ob-ject of the present invention is to avoid
erratic readings of the flow meter where a single
valve controls passage thro-ugh the ñow meter
and through the bypass.
According to the present invention the pas
sages leading to th'e flow meter and to the bypass
push-lit sleeve on a rubber tube or the like flex
ible connection to the face mask. A handle 32
may be provided for transporting the apparatus.
The flow meters I8 and 25 may be of any de
10 sired form. In the> arrangement shown, when
are arranged in sequence to one another from a
ñuid is flowing a loose mushroom-headed pin 35
will ybe supported in known manner by the co1
umn'of fluid moving upwardly and will remain
common inlet passage controlled by the metering
poised at a height depending on the rate of flow,
valve controlling the supply of nitrous oxide or 15 so that the rate of ñow can be measured by means
other anesthetizing gas.
The invention is more particularly described
with reference to the accompanying drawing, in
which:
Figure 1 is a front elevation, partly in section,
of one form of apparatus.
Figure 2` is a sectional plan view on the line
2--2 of Figure 1,
of the scale 36 at the scale indication lying op
posite the top ñat side of the mushroom-headed
freely displaceable pin.
It will be noted that the ñow meter I B has con
nection with the common passage 3I at a point
between the bypass l5 and th'e opening of the
outlet 30, whereby the flow .through meter I8 is
characteristic of the total ilow and its scale read
Figure 3 is a sectional plan view on the line
ing indicates this flow: and that :the valve I2
3-3 of Figure 1.
25 controls the ñow through the meter I8 and
Oxygen and nitrous oxide, or other anesthe
through' the bypass I9, in common. The tubes
tizing. gas bottles may be connected by flexible
of the meter are very slightly tapered in the usual
tubes to nipples I, 2, preferably detachable to
way so that the diameter is greater at the top
contain filters 3, 4, th'ese nipples being secured
than
at the bottom but this taper is too small
30
to perforated projections 5, 6, respectively, on
to be shown on the drawing.
the frame 1. This frame is drilled with a pair
» I declare that what I claim is:
of bores 8, 9, these bores being cross-drilled, as
l. An anesthetizing apparatus h'aving a body
at I0 and 33, I0 being Opposite the perforated
structure with a nitrous oxide inlet and an out
projection 6. The end of the projection 6 in the
bore I ß is provided with a seating I I for a meter 35 let for delivery of gasto the patient, an inlet pas
sage leading from said inlet, a metering valve
ing valve or plug I2. The bore 8 is plugged as
effective
for controlling ñow from the inlet into
at I3, the bore 9 at I4 and I5, and the bore 33 at
the said inlet passage, a flow meter connected to
34.
an intermediate point of the length of said inlet
Passages I5, I1, respectively lead off to the
passage,
a bypass leading from a point of said
flow meter I8 and to a bypass tube I9, the pas 40
passage farther from said inlet than the said
sage I'I preferably being drilled at an angle to
ñow meter connection, an outlet passage connect-v
avoid any sudden change of direction 0f th'e flow
ed to said outlet, a channel connecting said flow '
of the gas to this extension of passage 9 beyond
meter to said outlet passage at an intermediate
the flow meter connection which would tend to
cause irregularity of flow in the passages 8 and 45 point of the length of said outlet passage, said
bypass opening into said outlet passage at a, point
9 leading to the now meter I8.
thereof
farther from the said outlet than said
Similarly the perforated projection 5 com
channel connection, said flow meter and bypass
municates with a lateral bore 2,0 which has a
being in parallel to one another and each being
seating 2| for a metering valve 22 allowing pas
eiîective to provide a communication between
sage, for instance of oxygen, to arpassage 2_3 lead 50 said passages with the path of communication
ing through passage 24 to a ilow meter 25. 'I'h'e
from inlet to outlet being shorter through the
passage 28 leading from the perforated projec
ñow meter than the path through th'e bypass,
tion 5 leads to an emergency valve 2l controlled
said valve providing a common control of -gas
by a press-button 28 which when depressed places
ilow in said flow meter and said bypass.
'
the passage 26 in communication with a passage 55
2. An anesthetizingapparatus having a body
i
.
_
2,406,129
structure with a nitrous oxide inlet'and an out
let, a channel connectingsaid ñow meter to said `
outlet passage at an intermediate point >of the
let fory delivery of gas to the patient, an inlet
passage leading from said inlet, a metering Valve
length of said outlet passage, said bypass open
inlet passage having said flowmeter connection
meter and said bypass.
ing into said outlet passage at a Apoint thereof
eiîective for controlling flow from the inlet into
farther from the said outlet than said channel
the saidk inlet passage, a flow meter connected to
lconnection, said flow meter and bypass being in
an intermediatepoint of the length of said inlet
parallel to one another and each being effective
passage, a bypass leading from a point of said
to provide a communication between said pas,
passage farther from said inlet than the said flow
v sages with the path of communication from inlet
meter connection,v a part of said inlet passage
to outlet being shorter through the flow meter
between said flow meter connection and said by 10 `than the path through the bypass, said valve pro
pass being inclined at an angle other than a right - » viding a common control ofgas ñow in said iiow
angle relative to the direction of the partv of said "
thereon, an outlet passage connected-to said out- .
JOHN HENRY Einlass.-y
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