U.S. patent number 3,877,427 [Application Number 05/256,915] was granted by the patent office on 1975-04-15 for oxygen compressive chamber.
Invention is credited to Semen Mikhailovich Alexeev, Mark Nikolaevich Arkhangelsky, Valentin Pavlovich Baldin, Boris Solomonovich Braverman, Vladimir Petrovich Gorjushev, Jury Petrovich Rogachev, Gai Ilich Severin, Jury Andreevich Spassky, Boris Vasilievich Spolitak, Vladimir Vladimirovich Ushinin, Rustam Ismailovich Utyamushev, Jury Dmitrievich Vasiliev, Alexandr Lvovich Zelvinsky.
United States Patent |
3,877,427 |
Alexeev , et al. |
April 15, 1975 |
Oxygen compressive chamber
Abstract
An oxygen compressive chamber intended for treating patients by
the method of oxygen therapy under hyperbaric conditions. The
chamber comprises an outer portion, which is made collapsible, and
an inner portion, made as a detachable stretcher to bring the
patient thereon into the chamber, and then to hand-carry the
chamber together with the patient placed therein.
Inventors: |
Alexeev; Semen Mikhailovich
(Moscow, SU), Arkhangelsky; Mark Nikolaevich (Moscow,
SU), Baldin; Valentin Pavlovich (Moscow,
SU), Braverman; Boris Solomonovich (Moscow,
SU), Vasiliev; Jury Dmitrievich (Ljubertsy Moskovskoi
oblasti, SU), Gorjushev; Vladimir Petrovich (Moscow,
SU), Zelvinsky; Alexandr Lvovich (Moscow,
SU), Rogachev; Jury Petrovich (Moscow, SU),
Severin; Gai Ilich (Zhudovsky, SU), Spassky; Jury
Andreevich (Moskovskaya oblast Noginsky raion, SU),
Spolitak; Boris Vasilievich (Moskovskaya olbast Schelkovsky
raion, SU), Ushinin; Vladimir Vladimirovich
(Moskovskaya oblast Ljuberetsky raion, SU), Utyamushev;
Rustam Ismailovich (Moskovskaya oblast Schelkovo,
SU) |
Family
ID: |
22974128 |
Appl.
No.: |
05/256,915 |
Filed: |
May 25, 1972 |
Current U.S.
Class: |
128/202.13;
128/205.26; 601/43; 5/629; 600/21 |
Current CPC
Class: |
A61G
10/026 (20130101) |
Current International
Class: |
A61G
10/02 (20060101); A61G 10/00 (20060101); A61m
016/02 () |
Field of
Search: |
;128/204,1B,191A,145.5,145.6,145.8,184,191,202,203,298,297,140,142.2,142.3,30
;98/1.5 ;49/477 ;285/97 ;5/82,362 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
289,323 |
|
Dec 1915 |
|
DT |
|
847,474 |
|
Jun 1952 |
|
DT |
|
14,501 |
|
Jul 1956 |
|
DT |
|
Primary Examiner: Gaudet; Richard A.
Assistant Examiner: Recla; Henry J.
Claims
What we claim is:
1. An oxygen compressive chamber for rendering emergency medical
aid to the patient placed inside said chamber, comprising first and
second rigid end-face walls; a collapsible elastic side wall
connected with the first of said end walls; a stretcher formed by a
bed with tubular rods connected to the second of said end walls on
one end; tubular sockets mounted in said first end wall and
connected to the free ends of said rods of the bed so that when the
said side wall is connected with said second end wall said side
wall jointly with said end walls forms a closed volume wherein the
bed is arranged; an airtightening connector releasably connecting
said side wall to said second end wall; and means for supplying the
chamber mounted on said first end wall with an oxygen supply means
arranged in the leg portion, said system having circulation and
purging injectors with outlets of each terminating within the
corresponding one of said sockets in the first end wall, perforated
manifold means disposed on said second end wall and communicating
with said tubular stretcher rods, whereby said stretcher installed
in said sockets conducts oxygen into the head portion of the
chamber through said perforated manifold.
2. An oxygen compressive chamber as defined in claim 1, including
means for remotely injecting medicine into said patient; air
conditioning means for conditioning the air to a desired
temperature and humidity within said chamber; control panel means
with intercom means, said chamber being collapsible for storage and
transportation, said chamber being free of an external electrical
source of power, said oxygen supplying means comprising compressed
gas flasks for building up pressure inside said chamber, said
chamber being substantially cylindrical for building up pressure
within said chamber; a manually controlled safety valve
communicating with said chamber for exhausting the oxygen supplied
by said flasks from said chamber; and injectors communicating with
said chamber for supplying said oxygen to said chamber and
intermixing the gas inside the chamber for preventing development
of stagnation zones.
3. An oxygen compressive chamber as claimed in claim 2, wherein the
said airtight connector comprises two profiled flanges, one of said
flanges being disposed on the second end wall of the chamber, while
the other is secured to the side wall of the chamber, the former of
said flanges incorporating an inflatable rubber bead and a metal
L-shaped split ring carrying on the joint thereof a two-link lever
lock, while the latter of said flanges is fitted with an
airtightening seat and a shoulder, the latter shoulder cooperating
with said L-shaped split ring.
Description
The present invention relates to medical equipment used for
treating patients by the method of oxygen therapy under the
conditions of hyperbaric pressure.
In recent years this method has acquired a certain practical
importance.
The above method is applied particularly for treating patients
afflicted with stenocardia and infarction of the myocardium,
intoxication, general and tissue hypoxia, shock, cranio-cerebral
trauma, gas gangrene, tetanus, reticular embolism, occlusion of
mesenteric vessels, necrosis of skin flaps, etc. (cf., e.g.,
"Clinical Application of Hyperbaric Oxygen", Proceedings of the
International Congress, Amsterdam, September 1963, Edited by I.
Boerema, W. H. Brummelkamp and N. G. Meigne, and also
"Hyperbarooxygenotherapia" (in Russian), edited by professor G. L.
Ratner, Proceedings of Kuibyshev medical institute named after D.
I. Ulyanov, 1970).
The above method of treatment is carried into effect by the
application of various oxygen compressive chambers. A pure oxygen
medium is established in these chambers at a pressure close to 3
kg/cm.sup.2 with maintaining certain humidity and temperature
levels, and extracting deleterious gas admixtures exhaled by the
patient.
The treatment is effected in courses under clinical conditions. The
existing chambers incorporate air conditioning and regeneration
systems, equipment for medical control over a patient, emergency
protection systems including those of urgent pressure release, fire
preventing systems, interphone systems, etc. (cf., e.g., G.F.R.
Pat. No. 948,736, Cl.Cl. k 13/03 of July 8, 1949, USSR Author's
certificate No. 228,879, Cl. 30k, 13/03, of October 17, 1968, U.S.
Pat. No. 3587574, Cl. 128-204 of June 28, 1971).
One of the most convenient and perfect versions of oxygen chambers
in question is a chamber available from the British firm "Vickers
Limited" (medical Group, Clinical Hyperbaric System).
However, all the above-mentioned chambers known in the art are
superfluously sophisticated, heavy in weight, large in size and
used only in clinics for stationary treatment of patients.
At the same time, the efficiency of treating patients by hyperbaric
oxygen depends to a great extent on what stage of the disease the
treatment has been commenced; it may be often times required to
effect hyberbaric oxygen treatment immediately at patient's home,
at a place of accident, or even during carrying the patient in an
ambulance vehicle. Therefore, the medical institutions are of the
necessity confronted with a problem of furnishing the first-aid
service with oxygen compressive chambers which could be collapsed
into transportation position so as not to occupy much space in the
ambulance saloon in those cases when the chamber is not actually
employed for the purpose. The chamber should ensure expeditious
converting into operating position, permit the patient to be
conveniently placed in it, be easily hand-carried by
stretcher-bearers to a place of accident or to a patient's bed.
An oxygen chamber has been developed in Britain in 1960 (actual
inventors - Emery, Lucas, Williams) and installed in an ambulance
vehicle which was primarily employed for treating patients
intoxicated by carbonic oxide or afflicted with infarction of the
myocardium, and the like. This chamber is shaped as a cylinder
mounted horizontally on a bogie. The chamber incorporates an
open-type oxygen system, wherein oxygen is delivered into the
chamber in a continuous stream, while pressure is regulated through
a release valve.
However, in principle, the design of this chamber is but little
differing from stationary-type chambers, being so much bulky and
weighty. Among collapsible comressive chambers known in the art, a
stress can be made on a stationary chamber constructed according to
the GFR Pat. No. 847,474, Cl. 30k, 31/03 of Aug. 25, 1952.
According to this patent the chamber is made as a series of
cylindrical rings which are telescopically retracted into each
other when the chamber is in inoperative position. However, this
chamber is superfluously heavy and bulky. Seals of telescopic
compartments of the chamber make it difficult to expeditiously
convert the chamber into operating state and are not able to ensure
convenient putting of the patient in grave or unconscious
condition.
Also known in the art is an oxygen compressive chamber constructed
according to the USSR Author's certificate No. 199,342, Cl. 30k,
13/03, of July 13, 1967. This chamber is made as an elastic bag
incorporating a stepped entrance extension and has a gas pressure
reducer, a safety valve and a pressure gauge. This chamber is
intended for treating miners at a place of accident, intoxicated by
mine gas during breakdowns in mines. However, the chamber according
to this construction is not able to ensure the required hyperbaric
oxygen pressure and is also inconvenient in operation.
It is therefore an object of the present invention to provide a
light-weight portable compressive chamber for treating patients by
the method of oxygen therapy under hyperbaric conditions.
This and other objects are achieved by the provision of an oxygen
compressive chamber for rendering emergency medical aid to the
patient placed inside said chamber which incorporates a ventilation
system and a system of oxygen delivery to said chamber, said
chamber according to the present invention comprising an outer
portion which is made collapsible, and an inner portion
representing a detachable stretcher for bringing thereon a patient
into said chamber and carrying said chamber together with said
patient.
At least one embodiment of the present invention may incorporate a
collapsible portion of the chamber, said portion having two rigid
end walls provided with sockets for mounting a stretcher therein,
and a side surface made of an elastic material, whereas to at least
one of said end walls the side surface is secured by means of a
releasable airtightening connection.
It is expedient that the split airtightening connection is made up
of two profiled flanges one of which is disposed on the end wall of
the chamber, while the other is secured to the side surface of the
chamber, whereas the first flange incorporates an inflatable rubber
bead and a metal L-shaped split ring with a two-link lock installed
in the joint of the split, while the second flange is fitted with
an airtightening seat and a shoulder, through which the latter
cooperates with the L-shaped split ring.
In another embodiment of the present invention, a stretcher is
fitted with rods made of pipes when one of the pipes is connected
to a circulation injector to ensure oxygen delivery and ventilation
of the chamber, while the other is connected to an injector for
purging the chamber with oxygen.
The present invention provides for a solution of the technical
problem set forth, namely, effecting hyperbaric oxygen treatment
directly at a place of accident, during hand-carrying and
transportation of the patient.
The chamber is attended by a single physician and hand-carried by
two stretcher-bearers. For transportation, the empty chamber can be
collapsed to reduce its overall length almost thrice. The chamber
is provided with a control desk, an interphone device, and a device
for the remote introduction of medicinals to the patient, which
substantially raises the efficiency of treatment.
The stock of oxygen in the chamber makes the latter self-contained
in operation; with oxygen supply from a stationary source the
chamber operating period can be increased.
The chamber is equipped with a common communication coupling to
connect a conditioner to permit a wider temperature range of the
chamber application.
Provision is made for disconnection of a portion of the chamber
with the stretcher to make it easier to carry the chamber with the
patient inside it.
Other objects and advantages of the present invention will be more
apparent from the detailed description of certain embodiments with
reference to the accompanying drawings, in which:
FIG. 1 is a general view of an oxygen compressive chamber,
according to the present invention;
FIG. 2 shows a portion of the oxygen compressive chamber with a
stretcher, while the remaining portion of the chamber is
disconnected to make it easier to carry the patient;
FIG. 3 shows the chamber while in idle (or transportation)
position;
FIG. 4 is a longitudinal section through the chamber while in
operating position;
FIG. 5 is a section taken along the line A--A in FIG. 4;
FIG. 6 shows the chamber in the initial position (prior to starting
operation);
FIG. 7 is a general view of the releasable airtightening
connection;
FIG. 8 is a sectional view of the releasable airtightening
connection (see FIG. 7, Ref. I);
FIG. 9 is a general view of an L-shaped split ring which is used in
the releasable airtightening connection;
FIG. 10 shows a two-link lock of the releasable airtightening
connection (see FIG. 9, Ref. II);
FIG. 11 is a schematic layout of the oxygen system in the
chamber;
FIG. 12 is a schematic layout of an embodiment of the device for
the remote introduction of medicinals to the patient;
FIG. 13 is a structural layout of the sealing unit while in the
initial position; and
FIG. 14 is a structural layout of the sealing unit while in
operating position.
The oxygen compressive chamber of the invention comprises two rigid
end walls, viz., a head wall 1 and a rear wall 2 (see FIG. 1), and
a side surface 3 made of an elastic airtight material. Mounted on
the wall 2 are an oxygen bottle and a control desk of the oxygen
system of the chamber 4. Attached externally to the end walls 1 and
2 are sockets to connect handles 5 (for carrying the chamber) and
legs 6 with ground rollers. In no-use position (see FIG. 3),
handles 5 can be disconnected from the chamber.
Constituting a portion of the chamber is a stretcher 7 (see FIG. 2)
intended for putting the patient thereon and bringing the latter
into the chamber; the stretcher is provided with a tipping leg
8.
Welded to the head wall 1 are tubular sockets 9, while welded to
the rear wall 2 are sockets 10, serving to install the stretcher 7
(FIG. 4) therein.
Provided at the ends of the side surface 3 are flanges 11 and 12;
rigidly secured to the flange 12 are two symmetrically disposed
brackets 13 with guide rollers 27 (FIGS. 4, 5).
The flange 12 and the flange 14 of the wall 1 form a releasable
airtightening connection, whereas the end wall 2 has a flange 15
welded thereto, with which the latter is permanently connected to
the flange 11. Mounted to the wall 2 is a rigid protective shroud
16 carrying on its inner side one end of a telescopically
retracting pipe 17; the opposite end of the pipe is connected to
the flange 12. Attached to the side surface 3 of the chamber are
rings 18 through which the pipe 17 is passing. Disposed on the head
wall 1 along an arc is a perforated tubular manifold 19 connected
with its ends to sockets 9. The head wall 1 is furnished with a
cushion head-rest 20. Two-way communication with a patient is
effected by means of a microphone 21 and an interphone device 22
located outside the chamber. To visually observe the patient, the
head wall is given illuminators 23.
The stretcher 7 comprises a bed 24 with a mattress, and two rods
made of pipes 25 rigidly connected to the bed 24. Secured
underneath and to the bed 24 are two channelled guide members 26
whose recesses enclose rollers 27 which are securely affixed to the
brackets 13 (see FIGS. 4,5).
Mounted to the flange 12 of the side surface of the chamber (see
FIG. 6) is a two-end hook 28, one end of which cooperating with a
lock 29 found on the shroud 16, while the other end of the hook
cooperating with a lock 30 found on the wall 1.
The releasable airtightening connection formed by the flanges 12
and 14 (see FIGS. 7,8,9,10) incorporates an inflatable rubber bead
31 of which the inner space is communicating via a hole 32 with the
inner space of the chamber.
Located in a slot of the flange 12 is a metal L-shaped split ring
33 adjacent to a circular shoulder 34 of the flange 12 the latter
having a seat blade 35 which thrusts against the bead 31.
Installed in the joint of the split ring 33 is a two-link lock 36,
comprising a pivoted lever 37 located on one side of the split of
the ring 33, and a lever 38 located on the other side thereof. The
lever 38 carries a spring-loaded latch gear 39.
The oxygen system of the chamber, mounted principally in the wall
2, comprises an oxygen bottle 40 (see FIG. 11), a charging union 41
and a pressure gauge 42, of which both are disposed at the inlet of
the bottle; a pressure reducer 44 and a circulation injector 45
located in the inner space of the socket 10 to which is connected
the pipe 25 of the stretcher 7.
Parrallel to the line of the circulation injector 45 is located an
oxygen line for the purging the chamber, the latter line consisting
of a two-way cock 46 and an injector 47 of increased oxygen
delivery.
Located on the suction line of the circulation injector 45 is a
common coupling case 48 with non-return valves 49 which are pressed
off their seats by the pushers of a stopper 50. (If necessary, the
stopper 50 of the case 48 can be replaced with a mating coupling
case to connect the chamber to a conditioner).
Mounted in the wall 1 of the chamber is a signalizer 51 to check
pressure in the inner space of the manifold 19.
The signalizer 51 includes a spring-loaded diaphragm carrying a
permanent magnet 52 which is cooperating with an electric contact
53 through the housing wall.
The super-diaphragm space of the signalizer 51 communicates with
the inner space of the manifold 19, while the sub-diaphragm space
of the signalizer communicates with the inner space of the
chamber.
The inner space of the chamber communicates with a pressure gauge
54, whereas the wall 2 carries a regulator 55 of oxygen pressure in
the chamber, and a safety valve 56.
The oxygen compressive chambers known in the art are often
furnished with special devices to effect remote introduction of
various medicinals to the patient placed inside the chamber.
Provisions of injections materially improve the efficiency of
treatment by the hyperbaric oxygen method.
The oxygen compressive chamber, according to the present invention,
is provided with special sealing sockets for inserting therethrough
the pipelines of the injection device.
Described hereinafter is one of the embodiments (see FIG. 12) of
the injection device according to the spirit of the present
invention, comprising a stand 57, to which a holder 58 is secured
and locked on the stand by a screw 59. A container 60 for keeping
various medicinals is held in a transparent protective hood 61
which is covered at top with a pressure cover 62.
The container 60 is closed by a thick-walled rubber plug 63 through
which two needles are inserted, viz., a short needle 64, and a long
needle 65, the top end of the latter needle emerging above the
level of the liquid. The stand 58 is adapted to fix thereon a
number of containers 60. The equal-length needles of each container
are connected to a common pipeline 66 (for needles 65) and to a
common pipeline 67 (for needles 64). Mounted on the branch pipes of
the pipeline 66 are clamps 68, while on the branch pipes of the
pipeline 67 -clamps 69. In addition to that, a filter 70 is
installed at the inlet of the pipeline 67.
Built in the wall of the oxygen compressive chamber are sealing
sockets 71 and 72 for airtightened insertion of the pipelines 66
and 67 into the chamber. Complementary fitted to the end of the
pipeline 67 is an adapter 73 for an injection needle 78 (see FIG.
13), the latter adapter being protected with a rubber cap 74.
The sealing socket 71 (or 72) comprises a thick-walled rubber
washer 75, a retainer 76, and a pressure nut 77.
The chamber is functioning as follows.
Prior to placing a patient therein, the chamber is to be prepared
in the following way (see FIG. 6). The side surface 3 of the
chamber is folded bellows-like in the protective shroud 16, while
the flange 12 of said surface is pulled up towards the shroud 16 by
means of the lock 29.
The stretcher 7 is fixed in sockets 9 of the wall 1 by means of a
spring-loaded catch (not shown). The leg 8 of the stretcher 7 is
tipped down into operating position to facilitate insertion of
pipes 25 into sockets 10 when connecting the wall 2 of the chamber
to the stretcher 7. When this is being done, rollers 27 of brackets
13 come into the channels of the guide members 26 of the stretcher
7.
Then, the lock 29 is released and the flange 12 together with the
side surface 3 of the chamber are moved to the extreme left-hand
position. During this action, the flange 12 is moving along the
guide members 26 of the stretcher, while the pipe 17, through the
medium of the rings 18, keeps the side surface 3 of the chamber in
the horizontal position (see FIGS. 4,5,6).
Now, by means of the lock 30, the flange 12 is pulled up toward the
flange 14 of the wall 1 of the chamber; this makes the split ring
33 expanding, coming over the shoulder 34 and then locking. The
blade 35 thrusts in the rubber bead 31, whereas the lock 36 holds
the releasable airtightening connection in the close position (see
FIGS. 6,7,8,9,10).
The above done, the valve 43 is opened, and oxygen starts flowing
from the pressure reducer 44 into the injector 45, thus initiating
the delivery and circulation of oxygen in the chamber. The injector
45 draws in oxygen from the chamber, forces it through the coupling
48-50 (with the stopper 50 mounted, the non-return valves 49 are
open) and delivers it into the manifold 19 via the pipe 25. Further
on, oxygen comes into the chamber through the holes in the manifold
and enters then inlet union of the coupling case 48. A portion of
oxygen bleeds out through the valve 55 (see FIG. 11).
A pure oxygen medium, when urgently needed in the inner space of
the chamber, is obtained by purging the chamber with oxygen. For
this purpose, the cock 46 should be opened and an increased rate of
oxygen delivery to the injector 47 should be ensured. An oxygen
stream from the injector 47 also comes into the manifold 19 and
therefrom together with air bleeds out through the valve 55. To
save oxygen, purging is usually performed at the very beginning of
the operation, when the valve 55 is adjusted for zero hyperbaric
pressure. In case the valve 55 went wrong, the safety valve 56 will
anyway act.
Pressure inside the chamber is checked against the pressure gauge
54, while normal functioning of the ventilation system can be
checked through the signalizer 51. In case of uncontrolled
reduction of oxygen delivery through the injector 45, as may be
with clogging the injector nozzle, the pressure head is dropping in
the inner space of the manifold 19; then, the spring presses off
the diaphragm and also the magnet 52 into the extreme right-hand
position to cause the electric contacts 53 to open (see FIG. 11).
This results in actuation of the audible ALARM Signal produced in
the interphone device 22 (see FIG. 4).
Removing the patient from the chamber is carried out in the reverse
order to that described above. The handle of the valve 55 (see FIG.
11) is set to zero position for the purpose of releasing the excess
oxygen pressure from the chamber. When no excess pressure is
observed, the lock 36 should be opened by shifting the latch 39 to
the right (see FIG. 10) and the lever 38 should be turned
counter-clockwise around its axis. This makes the split ring 33
expanding and slipping off the shoulder 34 to disengage the
connection (see FIGS. 7,8,9).
Upon opening the chamber, oxygen delivery is shut off by means of
the valve 43 (see FIG. 11).
The flange 12 is shifted to the extreme right-hand position to be
held by the lock 29 (see FIG. 6). The leg 8 of the stretcher is
tilted down, and now the portion of the chamber with the stretcher
can be detached. For transporting the empty chamber, the stretcher
7 is disconnected from the walls 1 and 2 of the chamber and then
the walls are coupled to each other (see FIG. 3).
To make injections of medicinals to the patient, the device for
remote introduction of medicinals is being actuated, which
functions as follows.
Containers 60 with the required medicinals are installed in the
holder 58. Needles 64 and 65 which should be preliminarily
sterilized together with pipelines 66 and 67, are inserted into the
containers as it can be seen from FIG. 12. Then, the pipelines 66
and 67 are inserted through the sealing sockets 71 and 72 of the
chamber, whereupon the protective cap is removed from the adapter
73 and an injection needle 78 is attached in place (see FIG. 14).
The nut 27 after being screwed in, ensures airtightness of the
pipelines with the help of washers 75 (see FIGS. 13 and 14).
The holder 58 is raised to a required height, clamps 68 and 69 are
made open and the inner spaces of the pipeline 67 with the needle
78 are filled with the medicinal (air bubbles should be completely
driven out from the inner space of the pipeline 67 and its branch
lines). The filter 70 traps and retains all mechanical impurities
which can occur in piercing the plug 63 by the needles 64 and 65.
Then, clamps 69 are closed, and before the compressive chamber is
airtightened, an injection is made to a patient by the injection
needle 78 (see FIGS. 12, 13, 14).
In the course of treatment by the hyperbaric oxygen method, the
physician may open the needed clamp 69 to introduce the required
medicinal to the patient. The device permits introduction of
several medicinals to the patient.
In operating the device, clamps 68 are always kept open, which
ensures constant equalizing of the pressure in the container 60 in
relation to the pressure in the compressive chamber.
The injection rate can be regulated by varying the lifting height
of the holder 58 on the stand 57. When medicinal injections are not
needed, the pipelines 67 and 66 are removed from the sockets 71 and
72 and stoppers are inserted instead.
The above described device for remote introduction of medicinals to
the patient who is accommodated in the compressive chamber, permits
injections to be performed by the generally adapted practice, which
requires no additional training of personnel attending the
chamber.
Thus, the oxygen compressive chamber implemented according to the
spirit of the present invention, is capable of efficient treatment
of a patient at a place of accident and also during carrying the
chamber by stretcherbearers, or in transit.
The stock of oxygen in the chamber is large enough for its
self-contained functioning within a matter of 1.5 hour, while with
oxygen delivery from a stationary source this period can be
extended as needed. The chamber is furnished with a common
communication coupling permitting a conditioner to be connected to
the chamber, which widens the temperature range of its application.
Maximum operating pressure of oxygen in the compressive chamber is
1.2 kg/cm.sup.2, the weight of the chamber is not over 55 kg, the
stripped chamber (see FIG. 2) weighs no more than 20 kg. The
chamber can be collapsed into idle (or transportation) position
(see FIG. 3) to make it thrice as shorter. Overall dimensions of
the chamber in operating position -- 2,800.times.900.times.700 mm,
when collapsed -- 950.times.900.times.700 mm. The interphone device
of the chamber contains its own power source (dry cell).
The chamber is simple and reliable in operation and can be applied
under urban or countryside conditions and also in remote areas
(when delivered by a helicopter, for example), at breakdowns in
mines and other accidents or emergencies.
* * * * *