Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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TITLE :
A DEVICE FOR TRANSFERRING VOLATILE LIQUIDS FROM A CONTAINER
TO A VAPORIZER.
FIELD OF INVENTION:
This invention relates to a device for transferring volatile liquids like
anesthetic
agents from a container to a receiver provided in a vaporiser.
BACKGROUND ART:
General anesthesia is administered as an inhaled gas or as an injected liquid.
Inhalation anesthetics consist of various medical gases and anesthetic agents
and these are mixed in appropriate proportions and administered to patients to
induce general anesthesia. In order to prolong anesthesia for the required
duration (usually the duration of surgery), the anesthesia cycle must be
maintained. Inhalation Anesthetic agents are volatile substances with
relatively
low boiling points, high vapor pressures and are stored in bottles in liquid
state.
The commonly used inhaled anesthetics are nitrous oxide (also known as
laughing gas), sevoflurane, desflurane, Isoflurane, enflurane and halothane.
Anesthetic agents are administered to a patient via an anesthetic vaporizer
attached to an anesthesia machine.
Accidental inhalation of the vapor by health care personnel can cause
drowsiness and repeated inhalations over a period of time can be a health
hazard and harmful. Connecting and disconnecting bottles of anesthetic agents
to a vaporizer should ensure that no or minimum release of the volatile
substance to the atmosphere occurs at any time. Devices that minimize the
likelihood of the escape of an anesthetic agent to the atmosphere are known in
the art. Designs of these devices are attempts to ensure that during
connecting
and disassembly of a supply container exposure of volatile anesthetic to the
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atmosphere is minimised. Also vaporizers attached to anesthetic machines, are
intended for use with specific anesthetic agent and provisions are required to
prevent accidental mix-up of containers at the setup stage. Conventionally the
anesthetic container and closure is provided with a specific shape or
projections,
and the connecting adaptor has a complementary shape or recesses for mating
with the container closure. However the existing devices are not fall-safe and
are
likely to be damaged due to prolonged use and due to careless storing and
handling. Further, they do permit a quantity of volatile fluid to escape to
the
atmosphere that remains in the fluid passage of the assembly that connects
receiver to the container after the transfer operation is over.
US patent 5381836 discloses a system for delivery of volatile liquid drugs as
supplied to a patient by an anesthetic vaporizer comprises a supply container
and a vaporizer which includes a sump. Each of the supply container and the
vaporizer is provided with a valve assembly which, when closed, prevent
passage of fluid from the supply container into the sump. The supply container
and the sump are connected to one another by means of a bayonet connection,
which is made when indexing elements on the containers correspond. The valve
assemblies in the containers are opened when the containers are connected to
one another by means of an insert located within an inlet conduit linking the
two
containers. The inlet conduit is rotatable between lowered and raised
positions,
to open a valve by which flow of fluid into and out of a reservoir for fluid
in the
sump can be controlled.
In this disclosure the opening and closing of the valve assemblies provided in
the
supply container and the vaporizer do not control the flow of the volatile
liquid
from the container to the vaporiser sump. The inlet conduit is rotated from a
lower position to a raised position to open a valve (provided between the
inlet
conduit and the receiver sump) by which flow of fluid is controlled. There are
no
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provisions in this arrangement to prevent escape of fluid trapped between the
valve assemblies provided in the supply container and the vaporizer, to the
atmosphere while the container is being disconnected from the receiver.
US patent 5505236 discloses a system for the delivery of a liquid anesthetic
agent to an anesthetic vaporizer. The system includes a supply container
having
a spout defining an outlet through which the agent can be discharged. A
reservoir
is provided in the vaporizer for holding the agent, and a receiving station is
provided on the vaporizer for receiving the container spout. The agent flows
from
the container through the spout by gravity into the reservoir. The container
spout
is located at the station to define the maximum liquid level of the agent in
the
vaporizer when gas flow into the container is blocked by the rising level of
the
liquid agent. In one embodiment, a frangible seal is provided in the
container, an
outlet valve is provided in the container, and an inlet valve is provided in
the
receiving station. The valves open automatically as the container is inserted
into
the. receiving station of the vaporizer. Also, the container spout is
preferably
movable relative to a collar so as to automatically effect rupture of the
frangible
membrane as the container is inserted into the receiving station of the
vaporizer.
This system operates with a spring controlled outlet valve in the container,
and
an inlet valve in the receiving station. The container is also provided with a
movable spout to open the valves automatically as the container is inserted
into
the receiving station of the vaporizer. The operation sequence of opening the
receiving station valve first is achieved by the providing a spring having
less
compression force in the receiving station valve as compared to the container
valve. This arrangement is not a failsafe system and may lead to spillage in
prolonged usage of the device.
US patent 5687777 discloses an anesthetic vaporizer filler valve that can be
used in conjunction with anesthetic agent bottles currently commercially
available
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and which have standard keying systems with rotating collars having lugs
extending therefrom. The standard collar of such anesthetic agent bottles is
keyed into the vaporizer filling valve. The vaporizer filler valve has an
internal
valve that must be opened in order to introduce the liquid anesthetic agent
into
the vaporizer sump. By means of a corresponding slot in the vaporizer filler
valve
that correspond with mating lugs of the standard anesthetic agent bottle, only
a
proper anesthetic agent bottle can engage and be screwed into the filler valve
designed for that specific anesthetic agent.
The device disclosed in the document is suitable for preventing accidental mix-
up
of anesthetic containers containing not suitable anesthetic agents from being
fitted to a vaporiser at the setup stage. The opening and closing sequences of
the valves are not part of this disclosure.
US patent 6585016 discloses a system for facilitating the delivery of a liquid
anesthetic agent from an anesthetic bottle to an anesthetic vaporizer. The
system includes a bottle receiver subassembly, an anesthetic bottle and a
filler
arrangement positioned on the anesthetic vaporizer. The bottle receiver
subassembly and filler arrangement each include a keyed configuration such
that
only the correct type of anesthetic agent can be emptied into the anesthetic
vaporizer. The bottle receiver subassembly includes an receiver subassembly
valve assembly that engages a filler valve assembly contained within the
filler.
The dimensions and arrangement of the receiver subassembly valve assembly
and the filler valve assembly insure anesthetic agent is delivered to the
anesthetic vaporizer only when the anesthetic agent can safely flow from the
anesthetic bottle to the anesthetic vaporizer.
The device disclosed in the document is suitable for preventing accidental mix-
up
of anesthetic containers containing not suitable anesthetic agents from being
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fitted to a vaporiser at the setup stage. The opening and closing sequences of
the valves are not part of this disclosure.
There is a need for an improved connecting device to minimize the likelihood
of
leakage of the volatile liquid or vapour, independent of the operator skill
and
ensure connection of correct anesthetic containers to the vaporizer inlets.
OBJECTS OF THIS INVENTION:
One of the objects of this invention is to provide a connecting device adapted
to
transfer volatile substances from a container to a receiver of a vaporiser
Yet another object of this invention is to provide a connecting device that is
adapted to prevent the escape of an anesthetic gas to the atmosphere.
Another object of this invention is to provide a connecting device that is not
easily
damaged in storage and over sustained usage.
Another object of this invention is to provide a connecting device that is
simple in
construction.
Another object of this invention is to provide a connecting device that is
safe to
operate.
Another object of this invention is to provide a connecting device that
eliminates
the need for a highly trained operator for setting-up a container containing
volatile
substances on vaporiser and maintain the liquid flow.
Another object of this invention is to provide a connecting device that
reduces the
need for continuous manipulation of the device by the operator to sustain
liquid
flow.
Yet another object of this invention is to provide a connecting device
enhanced
operational features with regards to unconsumed liquefied gas stored in the
storage container.
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SUMMARY OF THE INVENTION
The invention embodies a device for transferring volatile fluid from a
container
to a receiver comprising a mechanism adapted to a fluid transfer through a
sequence of opening and closing of sealing elements wherein the sealing
element at receiver end opens first, followed by opening of sealing element at
container end to connect the container with the receiver through a fluid
passage
path, and disconnects fluid passage path first by closing a sealing element at
receiver subassembly end and then closing the sealing element at receiver end.
The invention is illustrated by a device for transferring an anesthetic fluid
from a
container to a receiver, said device (100) comprising: an receiver subassembly
(50) configured to be secured to said container (29) and a receiver
subassembly (30) adapted to be secured to said receiver; said sub assemblies
provided with components complementary to one another and movable sealing
elements adapted to selectively engage with one other such that in an
operative
receiver filling configuration, relative movement of the receiver subassembly
relative to receiver subassembly leads to first open the sealing element in
receiver subassembly and next open the sealing element in the receiver
subassembly to connect a fluid passage path from the container to the
receiver,
and in an operative stop-filling configuration, the relative movement of
receiver
subassembly relative to receiver subassembly in reverse direction leads to
close
the sealing element of the receiver subassembly prior to closure of the
sealing
element in the receiver subassembly.
In one embodiment of the invention, the said relative movement in the
operative
receiver filling configuration comprises a "rotate-rotate" movement i.e.
rotational
movement around the longitudinal axis of the container, that is combined with
a
concurrent axial movement of the said container towards the receiver; said
movement adapted in one direction to open and in reverse direction to close
said
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sealing elements to, respectively connect and disconnect said fluid passage
path
from the container to the receiver.
In another embodiment, the relative movement in the operative receiver filling
configuration comprises a "rotate-push" movement i.e. rotational movement
around the longitudinal axis of the container followed by an axial movement of
the container towards the receiver; said movement adapted in one direction to
open and in reverse direction to close said sealing elements to, respectively
connect and disconnect said fluid passage path from the container to the
receiver; the receiver subassembly being provided with a movable component
that either slides or rotates to move backwards.
In a further embodiment, the relative movement in the operative receiver
filling
configuration comprises a "push-push" movement, i.e. an axial movement of the
container towards the receiver followed by movement in reverse direction; said
movement towards the receiver adapted to open and in reverse direction to
close said sealing elements to, respectively connect and disconnect said fluid
passage path from the container to the receiver; the receiver subassembly
being
provided with a movable component that either slides or rotates to move
backwards.
A device according to this invention comprises: (A) an receiver subassembly
that
further comprises; a hollow cylindrical housing member (19) defining an
internal
passage having an annular seat; a movable element (17) provided with a
complementary sealing seat; and a resilient spring element (21) adapted to
apply
bias on said movable element, and (B) a receiver subassembly that further
comprising a housing (1) provided with an annular seat; an inner movable
element (5) having a complementary seat; a retaining bush (11); and a
resilient
spring (3) adapted to apply bias on said movable element.
In a "rotate-rotate" and "rotate and push" type:
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(A), the said receiver and receiver subassembly sub assemblies are provided
with internal and external threading (12, 20) respectively, the said threading
being complementary to one other,
(B) The receiver subassembly (50) and container (29) of this invention are
provided with slots (22) and projecting formations (22a) complementary to one
another,
(C) has at least one of the of the following: (a) receiver subassembly (50)
and
receiver subassembly (30) have threads complementary to each other, (b)
receiver sub-assembly (30) is threaded to the receiver, (c) receiver
subassembly
(50) is threaded to the container (29).
(D) a sealing arrangement to keep the mating surfaces of the arrangement in
leak proof condition, which may be achieved by a spring (3) loaded
arrangements,
(E) said spring loaded sealing arrangement comprises a component of the
sealing arrangement that is movable by exerting pressure on it (5); said
mating
surfaces adapted to move apart to permit flow through the receiver
subassembly.
An embodiment of this invention comprises a method of transferring volatile
fluid
from a container to a receiver, said method comprising the steps of: (a)
providing
an receiver subassembly configured to be secured . to said container; (b)
providing a receiver subassembly adapted to be secured to said receiver; (c)
providing said sub assemblies with components complementary to one another
and movable sealing elements adapted to selectively engage with one other; (d)
matching and assembling of said sub assemblies to one another; (e) moving
receiver subassembly relative to receiver subassembly in a first action to
open
said sealing element in an operative filling configuration to transfer said
fluid from
said container to the receiver and reverse the action in an opposite
direction. in
an operative stop-filling configuration, to stop said fluid transfer. The said
movement of the receiver subassembly relative to receiver may comprises a
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"rotate-rotate" movement, or a "rotate-push" movement or a "push-push"
movement as elaborated earlier.
In yet another embodiment, the device of this invention comprises a receiver
subassembly that is provided with an internal opening complementary to a
projection provided on said receiver subassembly; in an operative
configuration
said projection adapted to slidingly enter said opening. In this embodiment,
said
receiver subassembly subassembly (50) and container (29) are respectively
provided with slots .(22) and projecting formations (22a) complementary to one
another.
BRIEF DESCRIPTION OF THE DRAWINGS:
The invention will particularly be described with reference to the
accompanying
drawings, in which:
Figure 1 is a sectional elevation of the device in accordance with this
invention;
Figure 2 is an exploded perspective view of the receiving head of this
invention
as shown in figure 1;
Figure 3 is an exploded perspective view of the receiver subassembly of this
invention as shown in figure 1;
Figure 4 is a sectional elevation of the receiver subassembly of this
invention, as
shown in figure 1;
Figure 5 is a sectional elevation of the device of this invention, as shown in
figure
1, showing the receiving head, receiver subassembly and liquid container
connected in first stage of engagement, prior to commencement of flow of
contained fluid;
Figure 6 is a enlarged sectional elevation of the device of this invention, as
shown in figure 1, showing the receiving head and receiver subassembly and
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connected in first stage of engagement, prior to commencement of flow of
contained fluid;
Figure 7, Figure 8, Figure 9 are the sectional elevation and enlarged views of
the
device of this invention, as shown in figure 1, showing the receiving head,
receiver subassembly and liquid container in a second stage of engagement
wherein one of the closure device is in open condition;
Figure 10, Figure 11, Figure 12 are the sectional elevation and enlarged views
of
the device of this invention, as shown in figure 1, showing the receiving
head,
receiver subassembly and liquid container in a third stage of engagement
wherein both the closure devices are depicted in open condition and the
contained liquid flows in receiving head inlet
Figure 13, is a sectional elevation of an alternative embodiment of the device
in
accordance with this invention;
Figure 14, is an exploded perspective view of an alternative embodiment of the
receiver subassembly of this invention as shown in figure 13;
Figure 15, is a sectional elevation of an alternative embodiment of the
receiver
subassembly of the invention as shown in figure 13;
Figure 16, figure 17 are a sectional elevation and an enlarged sectional
elevation
of an alternative embodiment showing the receiving head, receiver subassembly
and liquid container connected in the first stage of engagement prior to
commencement of flow of contained fluid, of the invention as shown in figure
13;
Figure 18, 19 and 20 are the sectional elevation and enlarged views of the
device
of this invention, as shown in figure 13, showing the receiving head, receiver
subassembly and liquid container in a second stage of engagement wherein one
of the closure device is in open condition;
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Figures 21, 22 and 23 are the sectional elevation and enlarged views of the
device of this invention, as shown in figure 13, showing the receiving head,
receiver subassembly and liquid container in a third stage of engagement
wherein both the closure devices are depicted in open condition and the
contained liquid flows in the receiving head inlet
Figure 24, is a sectional elevation of another alternative embodiment of the
device in accordance with this invention;
Figure 25 is an exploded perspective view of the receiving head of this
invention
as shown in figure 24;
Figure 26, is an exploded perspective view of an alternative embodiment of the
receiver subassembly of this invention as shown in figure 24;
Figure 27, is a sectional elevation of the receiver subassembly of the
invention as
shown in figure 24;
Figure 28 and 29 are a sectional elevation and an enlarged sectional elevation
of
an alternative embodiment showing the receiving head, receiver subassembly
and liquid container connected in the first stage of engagement prior to
commencement of flow of contained fluid, of the invention as shown in figure
24;
Figure 30 and 31 are the sectional elevation and enlarged views of the device
of
this invention, as shown in figure 24, showing the receiving head, receiver
subassembly and liquid container in a second stage of engagement wherein one
of the closure device is in open condition;
Figure 32 is the sectional elevation and enlarged view of the device of this
invention, as shown in figure 24, showing the receiving head, receiver
subassembly and liquid container in a third stage of engagement wherein both
the closure devices are depicted in open condition and the contained liquid
flows
in the receiving head inlet
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Figure 33, is a sectional elevation of yet another alternative embodiment of
the
device in accordance with this invention;
Figure 34, is an exploded perspective view of an alternative embodiment of the
receiver subassembly of this invention as shown in figure 33;
Figure 35 is a sectional elevation of an alternative embodiment showing the
receiving head, receiver subassembly and liquid container connected in the
first
stage of engagement prior to commencement of flow of contained fluid, of the
invention as shown in figure 33;
Figure 36 is a sectional elevation of the device of this invention, as shown
in
figure 33, showing the receiving head, receiver subassembly and liquid
container
in a second stage of engagement wherein one of the closure device is in open
condition;
Figure 37 the sectional elevation of the device of this invention, as shown in
figure 33, showing the receiving head and receiver subassembly in a third
stage
of engagement wherein both the closure devices are depicted in open condition
and the contained liquid flows in receiving head inlet
Figure 38 is a sectional elevation of yet another alternative embodiment of
the
device in accordance with this invention;
Figure 39, is an exploded perspective view of the receiving head of this
invention
as shown in figure 38;
Figure 40, is an exploded perspective view of an alternative embodiment of the
receiver subassembly of this invention as shown in figure 38;
Figure 41, is a sectional elevation of the receiver subassembly of the
invention as
shown in figure 38;
Figure 42 is a sectional elevation of an alternative embodiment showing the
receiving head, receiver subassembly and liquid container connected in the
first
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stage of engagement prior to commencement of flow of contained fluid, of the
invention as shown in figure 38;
Figure 43 and 44 are sectional elevations of the device of this invention, as
shown in figure 38, showing the receiving head, receiver subassembly and
liquid
container in a second stage of engagement wherein one of the closure device is
in open condition;
Figures 45 and 46 are the sectional elevations of the device of this
invention, as
shown in figure 38, showing the receiving head and receiver subassembly in a
third stage of engagement wherein both the closure devices are depicted in
open
condition and the contained liquid flows in the receiving head inlet
Figure 47, is a sectional elevation of yet another alternative embodiment of
the
device in accordance with this invention;
Figure 48, is an exploded perspective view of an alternative embodiment of the
receiver subassembly of this invention as shown in figure 47;
Figure 49, is a sectional elevation of an alternative embodiment of the
receiver
subassembly of the invention as shown in figure 47;
Figure 50 is a sectional elevation of an alternative embodiment showing the
receiving head, receiver subassembly and liquid container connected in the
first
stage of engagement prior to commencement of flow of contained fluid, of the
invention as shown in figure 47;
Figures 51 and 52 are the sectional elevation and enlarged views of the device
of
this invention, as shown in figure 47, showing the receiving head, receiver
subassembly and liquid container in a second stage of engagement wherein one
of the closure device is in open condition;
Figure 53 is a sectional elevation of the device of this invention, as shown
in
figure 47, showing the receiving head, receiver subassembly and liquid
container
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in a third stage of engagement wherein both the closure devices are depicted
in
open condition and the contained liquid flows in the receiving head inlet;
Figure 54 is a sectional elevation of an alternative embodiment of the device
in
accordance with this invention;
Figure 55 is an exploded perspective view of the receiving head of this
invention
as shown in figure 54;
Figure 56 is an exploded perspective view of the receiver subassembly of this
invention as shown in figure 54;
Figure 57 is a sectional elevation of the receiver subassembly of this
invention,
as shown in figure 54;
Figure 58 is a sectional elevation of the device of this invention, as shown
in
figure 54, showing the receiving head, receiver subassembly and liquid
container
connected in first stage of engagement, prior to commencement of flow of
contained fluid;
Figure 59 is the enlarged sectional elevation of the device of this invention,
as
shown in figure 54, showing the receiving head, receiver subassembly and
liquid
container in a second stage of engagement wherein one of the valve assembly is
in open condition; and
Figure 60 and Figure 61 are the sectional elevation and enlarged views of the
device of this invention, as shown in figure 54, showing the receiving head,
receiver subassembly and liquid container in a third stage of engagement
wherein both the valve assembly are depicted in open condition and the
contained liquid flows into the receiving head inlet.
Figure 62, is a sectional elevation of an alternative embodiment of the device
in
accordance with this invention;
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Figure 63, is an exploded perspective view of an alternative embodiment of the
receiver subassembly of this invention as shown in figure 62;
Figure 64, is a sectional elevation of an alternative embodiment of the
receiver
subassembly of the invention as shown in figure 62;
Figure 65 is a enlarged sectional elevation of an alternative embodiment
showing
the receiving head, receiver subassembly and liquid container connected in the
first stage of engagement prior to commencement of flow of contained fluid, of
the invention as shown in figure 62;
Figure 66 is the enlarged sectional elevation of the device of this invention,
as
shown in figure 62, showing the receiving head, receiver subassembly and
liquid
container in a second stage of engagement wherein one of the valve assembly is
in open condition;
Figure 67 is the sectional elevation of the device of this invention, as shown
in
figure 62, showing the receiving head, receiver subassembly and liquid
container
in a third stage of engagement wherein both the closure devices are depicted
in
open condition and the contained liquid flows into the receiving head inlet
Figure 68 is a sectional elevation of an alternative embodiment of the device
in
accordance with this invention;
Figure 69 is an exploded perspective view of the receiving head of this
invention
as shown in figure 68;
Figure 70 is an exploded perspective view of the receiver subassembly of this'
invention as shown in figure 68;
Figure 71 is a sectional elevation of the receiver subassembly of this
invention,
as shown in figure 68;
Figure 72 is a sectional elevation of the device of this invention, as shown
in
figure 68, showing the receiving head, receiver subassembly and liquid
container
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connected in first stage of engagement, prior to commencement of flow of
contained fluid;
Figure 73 is the enlarged sectional elevation of the device of this invention,
as
shown in figure 68, showing the receiving head, receiver subassembly and
liquid
container in a second stage of engagement wherein one of the valve assembly is
in open condition;
Figure 74 and Figure 75 are the sectional elevation and enlarged views of the
device of this invention, as shown in figure 68, showing the receiving head,
receiver subassembly and liquid container in a third stage of engagement
wherein both the valve assembly are depicted in open condition and the
contained liquid flows into the receiving head inlet.
Figure 76 is a sectional elevation of an alternative embodiment of the device
in
accordance with this invention;
Figure 77 is an exploded perspective view of the receiving head of this
invention
as shown in figure 76;
Figure 78 is an exploded perspective view of the receiver subassembly of this
invention as shown in figure 76;
Figure 79 is a sectional elevation of the receiver subassembly of this
invention,
as shown in figure 76;
Figure 80 is a sectional elevation of the device of this invention, as shown
in
figure 76, showing the receiving head, receiver subassembly and liquid
container
connected in first stage of engagement, prior to commencement of flow of
contained fluid;
Figure 81 is a enlarged sectional elevation of the device of this invention,
as
shown in figure 76, showing the receiving head and receiver subassembly and
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connected in first stage of engagement, prior to commencement of flow of
contained fluid;
Figure 82, Figure 83 and Figure 84 are the sectional elevation and enlarged
views of the device of this invention, as shown in figure 76, showing the
receiving
head, receiver subassembly and liquid container in a second stage of
engagement wherein one of the closure device is in open condition; and
Figure 85 and Figure 86 are the sectional elevation and enlarged views of the
device of this invention, as shown in figure 76, showing the receiving head,
receiver subassembly and liquid container in a third stage of engagement
wherein both the closure devices are depicted in open condition and the
contained liquid flows out of the receiver subassembly out let.
DETAILED DESCRIPTION OF THE INVENTION:
Throughout the specification, the terms "valve", "sealing elements" and
"closure
elements" are used interchangeably to indicate same parts.
In the prior art devices when an anesthetic agent is being transferred from a
container to a receiver of a vaporizing unit, a small quantity of the
anesthetic fluid
remains trapped in the fluid path between the valve in the receiver and valve
in
the container. As the container is disconnected this trapped fluid / liquid
escapes
to atmosphere. Inhalation by those who are not intended to inhale it, becomes
an
unavoidable professional hazard to all those who operate in the area in which
such a transfer is done.
Thus, it seems that, in an improved transfer device for volatile liquids
including
anesthetic fluids, it will be ideal if the sequence of opening and closure of
the
valves is such that in a fluid transfer sequence, the valve guarding the
opening at
the junction of ' the transfer device and the vaporizer opens first, the valve
guarding the opening at the junction of the transfer device and the container
of
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anesthetic fluid opens next to connect a fluid path from the said container to
the
said vaporizer, the transfer of the fluid from the container to the vaporizer
can be
effected to the desired extent in this configuration, and after desired
transfer is
done, the valve guarding the opening of that connects container to the
transfer
device closed first and the valve guarding opening that connects device with
the
vaporizer closes the next, effectively cutting off the fluid path between
container
and the vaporizer and giving no opportunity for leakage of any residual liquid
from the transfer device. Achieving this sequence of opening and closing of.
the
valves, referred to in the specification further as "Most Preferred Sequence
of
Valve Action", was kept as a minimum objective that should serve as a common
technical feature of this invention and the invention describes various ways
in
which this objective is achieved.
The present invention provides a connecting device for coupling a container
containing volatile anesthetic agent to a vaporizer unit attached to an
anesthetic
administering machine. The connecting device comprising a receiver
subassembly adapted to be connected to the vaporizer and an receiver
subassembly configured to be connected to the container containing volatile
anesthetic agent. The receiver subassembly and the receiver subassembly are
provided with internal components adapted to receive resilient bias from
spring
elements to close the fluid passages in an inoperative condition of the
device.
According to the present invention the passage closure arrangements are
operable by movement of an receiver subassembly attached to the container
relative to the receiver subassembly in two stages. In the first stage of the
said
relative movement, the valve assembly provided in the receiver subassembly is
opened to connect the receiver subassembly to the vaporizer and then in the
second stage movement, the valve assembly provided in the receiver
subassembly subassembly is opened to establish fluid flow through the device.
In
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disconnecting the container from the vaporizer the sequence as above is
reversed and disconnection also takes effect in two stages, in first stage the
valve connecting receiver subassembly subassembly to the container gets
closed and then the valve connecting receiver subassembly gets closed, which
specifically is effective in preventing escape of the volatile anesthetic
agent to the
atmosphere. This sequential opening and closing of the valve assembly prevents
escape of the volatile anesthetic agent to the atmosphere while connecting or
disconnecting the filled container to or from the vaporizer and thereafter
from the
fluid passage path of the transfer device.
The present invention also provides for container specific slots on mating
components complimentary to ridges provided on the receiver subassembly body
to ensure anesthetic agent specific use of the device. This prevents
accidental
use of any other anesthetic agent apart from the one for which the assembly
has
been designed for.
The devices illustrating this invention (Refer to figures 1 to 12) comprise a
receiver subassembly indicated by reference numeral (30) and an receiver
subassembly indicated by reference numeral (50).
The receiver subassembly (30) consists of receiving body (1) adapted to
receive
a resilient spring (3), an inner pin (5), a gasket (9), a retaining bush (11)
and a
safety cap (13). In an operative configuration the components of the receiver
subassembly (30) are positioned inside the body (1) by the complementary
threaded connection between the body (1) and retaining bush (11). Fluid
passage paths (not specifically numbered) are provided within the receiver
subassembly (30) for facilitating fluid flow through the receiver subassembly
(30).
In an operative configuration the inner pin (5) and gasket (9) are held in
biased
condition against seating provided on the receiver subassembly to prevent
fluid
passage through the receiver subassembly (30). A safety cap (13) remove-ably
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WO 2010/109488 PCT/IN2010/000175
fitted on the bush (11) prevents accidental opening of the receiver
subassembly
closure elements when not in use and protects the components of the receiver
subassembly (30). The receiver subassembly (30) is fitted to the inlet of a
vaporizer (not specifically shown).
The receiver subassembly (50) consists of body (19), provided with internal
fluid
passage path. An inner pin (17) and a gasket seal (15) are fitted at one of
the
open end of the receiver subassembly body (19) and spring rest (21) and a
gasket (25) are assembled at the other end of the receiver subassembly body
(19). In an operative configuration the inner pin (17) and a gasket seal (15)
are
held in biased condition by spring (21) against the spring rest (23) to
prevent fluid
passage through the receiver subassembly (50). A safety cap (27) remove-ably
fitted on the receiver subassembly body (19) protects the components of the
receiver subassembly (50). The receiver subassembly (50) is fitted to a
volatile
fluid container (29). 1
The "Most Preferred Sequence of Valve Action" can be achieved in various ways.
Common feature of all the illustrated embodiments comprises: A method of
transferring volatile fluid from a container to a receiver, said method
comprising
the steps of: (a) providing an receiver subassembly configured to be secured
to
said container; (b) providing a receiver subassembly adapted to be secured to
said receiver; (c) providing said sub assemblies with components
complementary to one another and movable sealing elements adapted to
selectively engage with one other; (d) matching and assembling of said sub
assemblies to one another; (e) moving said receiver subassembly by a relative
movement to set in motion the Most Preferred Sequence of Valve Action.
The embodiments illustrated in this specification includes, without
limitation,
following categories of relative movements: (1) a "rotate-rotate" type, (2)
"rotate-
WO 2010/109488 PCT/IN2010/000175
push" type, (3) "push-push" type and (4) any variation in these obvious to a
person skilled in the art.
The "rotate-rotate" type includes rotating said receiver subassembly
subassembly with reference to said receiver subassembly first enough to engage
with the receiver subassembly and then to open sealing elements in an
operative filling configuration to transfer said fluid from said container to
the
receiver and rotate in an opposite direction in an operative stop-filling
configuration, first to stop said fluid transfer and then to disengage
receiver
subassembly from the receiver subassembly.
The "rotate-push" type includes rotating and engaging the said receiver
subassembly with reference to the receiver subassembly first and then
inserting
axially the receiver subassembly in to the receiver subassembly to open said
sealing elements in an operative receiver filling configuration to transfer
said
fluid from said container to the receiver and reversing the axial movement in
an
operative stop-filling configuration to stop said fluid transfer and to rotate
the
receiver subassembly in reverse direction to disengage from the receiver
subassembly.
The "push-push" type includes axially inserting said receiver subassembly in
to
said receiver subassembly to connect the sub assemblies and then to open said
sealing element in an operative receiver filling configuration to transfer
said fluid
from said container to the receiver and reversing the axial movement in an
operative stop-filling configuration, to stop said fluid transfer and
disconnect the
subassemblies from one another.
In the context of illustrated embodiments of above basic types, several
variations
are possible in actual mating components used and all the variations that
achieve
the basic function described above are included within the scope of this
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WO 2010/109488 PCT/IN2010/000175
invention. Some such variations are illustrated below, along with description
of
the basic embodiment representing this invention.
In a "rotate-rotate" type, shown in figures 1 to 12, bush (11) of the
receiving head
(30) is provided with threads (12) complimentary to threads (20) provided on
the
receiver subassembly body (19) to ensure use of specific agent container in
the
assembly. This prevents accidental use of any other anesthetic agent apart
from
one for.which the assembly has been designed for.
Figures 5 to 12 show the steps involved in transferring volatile liquids like
anesthetic agents from a container to a vaporizer in a "rotate-rotate" type.
Figure
5 and 6 indicate the first stage in which the device is set-up for
transferring
volatile fluid. The receiver subassembly subassembly (50) is fitted to a
volatile
liquid container (29) containing fluid to be transferred and inserted into the
receiver subassembly (30) after removing the respective safety caps (27 and
13).
At this stage the resilient bias applied by the springs (3 and 21) keep the
inner
pin (17) and the spring rest (23) in leak tight contact preventing fluid flow
through
the device.
Figures 7 to 9 indicate the second stage, in which the container (29) is
rotated
with the receiver subassembly (50), which in turn rotates the inner pin (5) of
the
receiver subassembly screwed on the inner thread of body (1), compressing
spring (3). This movement opens the flow path (A) of the receiving head (30).
Figures 10, 11and 12 indicate the third stage, in which the container (29) is
rotated further with the receiver subassembly (50), which in turn rotates
inner pin
(5) of the receiver subassembly. During this movement the inner pin (17).will
remain stationary due to hindrance from bush (11). This movement opens the
flow path (B) between the receiver subassembly (50) and the liquid container
(29) establishing liquid flow through the device. The sequence of operation
ensures that sealing arrangements provided in the device open one after the
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WO 2010/109488 PCT/IN2010/000175
other due to positive rotary movement of the container thereby preventing
accidental release of volatile liquid or vapour to the atmosphere.
Disconnection of
an empty or partly filled container from the device takes place in reverse
sequence in stages in a safe manner.
Figures 24 to 32, and 38 to 46 illustrate variations of "rotate-rotate" type
devices
having variations in complementary mating components, but have components
similar to components i.e. an inner pin (5), retainer bush (11), resilient
spring (3)
of receiver subassembly and plug (17), plug retainer (23) of the receiver
subassembly that are shown in figures 1 to 12, that essentially perform the
same
function.
In figure 26 the receiver subassembly component the inner pin (17) is
positioned
abutting from an additional component i.e. a top cap (26) and differs in its
shape
as compared to figure 3. As compared to this arrangement in figure 40, the
inner
pin is located within the top cap (26) and the top cap is provided with
complementary matching profiles instead of the inner pin (17). The above and
other such differences in positioning of the components and the relative shape
alter the individual component functions, illustrative of the various
combinations
that are feasible but essentially perform the same main function i.e. is to
open
and close the valve assemblies in a preferred sequential manner.
Figures 47 to 53 show a further alternative embodiment of the "rotate-rotate
type"
with a variation in the movement of opening and closing of sealing element
provided in the receiver subassembly. Referring figures 48 and 49 the receiver
subassembly (50) consists of body (19), provided with internal fluid passage
path. An inner pin (17), an O-ring seal (15) and top part (26) are fitted at
one of
the open end of the receiver subassembly body (19). -A gasket (25) is provided
on the other end of the receiver subassembly body (19) to secure the receiver
subassembly to a container (29). In an operative configuration the inner pin
(17)
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WO 2010/109488 PCT/IN2010/000175
and the O-ring seal (15) are held in biased condition by the spring (21)
against
the seat provided in the receiver subassembly body (19) to prevent fluid
passage
through the receiver subassembly (50). A safety cap (27) remove-ably fitted on
the receiver subassembly body (19) protects the components of the receiver
subassembly (50). The adaptor (50) is fitted to a volatile fluid container
(29)
Figures 51 and 52 indicate the second stage, in which the container (29) is
rotated with the receiver subassembly (50). Due to this movement the inner pin
(5) of receiving head is pushed back compressing the spring (3) provided in
the
receiving head (30). This movement opens the flow path (A) of the receiving
head (30).
Figures 53 indicates the third stage, in which the container (29) is rotated
again
into the receiver subassembly (50) till the top cap (526) stops further
movement
and causes the pin (17) to move back due to the relative motion. This movement
opens the flow path (B) between the receiver subassembly (50) and the liquid
container (29) establishing liquid flow through the device.
The sequence of operation ensures that closure arrangements provided in the
device open one after the other due to positive rotary movement of the
container
thereby preventing accidental release of volatile liquid or vapour to the
atmosphere. Disconnection of an empty or partly filled container from the
device
takes place in reverse sequence in stages in a safe manner.
Figures 13 to 23 show an alternative embodiment of the invention, "rotate-
push"
type, having an receiver subassembly generally indicated by the reference
numeral (50). Referring figures 14 and 15 the receiver subassembly (50)
consists
of body (19), provided with internal fluid passage path. An inner pin (17) and
a
gasket seal (15) are fitted at one of the open end of the receiver subassembly
body (19) and spring rest (23) and a gasket (25) are assembled via the other
end
of the receiver subassembly body (19). In an operative configuration the inner
pin
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WO 2010/109488 PCT/IN2010/000175
(17) and a gasket seal (15) are held in biased condition by springs (21)
against
the spring rest (23) to prevent fluid passage through the receiver subassembly
(50). A safety cap (27) remove-ably fitted on the receiver subassembly body
(19)
protects the components of the receiver subassembly (50). The adaptor (50) is
fitted to a volatile fluid container (29).
Matching part of the receiving head (not specifically numbered) is provided
with
threads complimentary to threads provided on the receiver subassembly body
(19) to ensure anesthetic agent specific use of the assembly. This prevents
accidental use of any other anesthetic agent apart from the one for which the
assembly has been designed for.
Figures 16 to 23 show the steps involved in transferring volatile liquids like
anesthetic agents from one container to another in a "rotate-push" type.
Figure
16 and 17 indicate the first stage in which the device is set-up for
transferring
volatile fluid. The receiver subassembly (50) is fitted to a volatile liquid
container
(29) containing fluid to be transferred and inserted into the receiving head
after
removing the safety cap (27). At this stage the resilient bias applied by the
springs (21) keep the inner pin (17) and the spring rest (23) in leak tight
contact
preventing fluid flow through the device.
Figures 18 to 20 indicate the second stage, in which the container (29) is
rotated
with the receiver subassembly (50). This movement in turn pushes the receiving
head pin (17) back, compressing spring and opens the flow path (A) between the
receiver (not specifically shown) and the receiver subassembly (50).
Figures 21 to 23 indicate the third stage, in which the container (29) is
pushed
with the receiver subassembly (50) into the receiver subassembly. This
movement pushes pin (17) back compressing the spring (21.). This operation
opens the flow path (B) between the receiver subassembly (50) and the liquid
container (29) establishing liquid flow through the device. The sequence of
WO 2010/109488 PCT/IN2010/000175
operation ensures that closure arrangements provided in the device open one
after the other due to positive rotary and axial movement of the container
thereby
preventing accidental release of volatile liquid or vapour to the atmosphere.
Disconnection of an empty or partly filled container from the device takes
place in
reverse sequence in stages in a safe manner.
Figures 33 to 37 illustrate variations of "rotate-push" type devices having
variations in complementary mating components, but have components similar to
components i.e. plug (17), plug retainer (23) resilient spring (21) and top
cap (26)
of the receiver subassembly subassembly that are shown in figures 14, that
essentially perform the same function.
In figure 34 the threads (20) complementary to threads (12) of the receiver
subassembly (30) is provided on the receiver subassembly body (19) as
compared to the arrangement in figure 14 wherein the threads are provided on
the top cap (26). Receiver subassembly component the inner pin (17) is located
within the top cap (26) in figure 14 whereas in figure 34 the inner pin is
different
in its shape and is located at one end of the top cap (26). The above and
other
such differences in positioning of the components and the relative shape alter
the
individual component functions, illustrative of the various combinations that
are
feasible but essentially perform the same main function i.e. is to open and
close
the valve assemblies in a preferred sequential manner.
Figures 54 to 61 show an alternative embodiment of the invention of "push-push
type".
Referring to figure 54, an alternative embodiment of the device for
transferring of
volatile fluids in accordance with the present invention is indicated by
reference
numeral (100). The device (100) comprising: a receiving head indicated by
reference numeral (30) and an receiver subassembly indicated by reference
numeral (50).
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WO 2010/109488 PCT/IN2010/000175
Referring to figure-55, the receiving head (30) consists of receiver
subassembly
body (1) adapted to receive a resilient spring (3), a pin (5), a gasket (609),
a bush
(611) and a safety cap (613). In an operative configuration the components of
the
receiving head (30) are positioned inside the body (1) by the complementary
threaded connection between the body (1) and bush (611). Fluid passage paths
(not specifically numbered) are provided within the receiving head (30) for
fluid
flow through the receiving head (30). In an operative configuration the pin
(5) and
gasket (609) are held in biased condition against seating provided on the
receiver subassembly to prevent fluid passage through the receiving head (30).
A
safety cap (613) remove-ably fitted on the bush (611) prevents accidental
opening of the receiving head closure device when not in use and protects the
components of the receiving head (30). The receiving head (30) is fitted to
the
inlet of a vaporizer (not specifically shown).
Referring to figures 56 and 57, the receiver subassembly (50) consists of body
(19), provided with internal fluid passage path. A plug (17), O-ring seals
(615a
and 615b), resilient spring (21), a top cap (623) and a retainer (24) are
fitted at
one of the open end of the receiver subassembly body (19). In an operative
configuration the plug (17), retainer (24) are held in biased condition
against
seating provided on the receiver subassembly body (19) to prevent fluid
passage
through the receiver subassembly (50). A safety cap (625) remove-ably fitted
on
the receiver subassembly body (19) protects the components of the receiver
subassembly (50). The adaptor (50) is fitted to a volatile fluid container
(27).
Receiver subassembly body (19) is provided with slots (not specifically
numbered) complimentary to ridges provided on an anesthetic container (27) to
ensure anesthetic agent specific use of the assembly. This prevents accidental
use of any other anesthetic agent apart from the one for which the assembly
has
been designed for.
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WO 2010/109488 PCT/IN2010/000175
Figures 58 to 61 show the steps involved in transferring volatile liquids like
anesthetic agents from one container to vaporiser. Figure 58 indicates the
first
stage in which the device is set-up for transferring volatile fluid. The
receiver
subassembly (50) is fitted to a volatile liquid container (27) containing
fluid to be
transferred and inserted into the receiving head (30) after removing the
respective safety caps (625 and 613). At this stage the resilient bias applied
by
the springs (3 and 21) keep the plug (17) and the pin (5) in leak tight
contact with
their respective seal seats (not specifically numbered) preventing fluid flow
through the device.
Figure 59 indicate the second stage, in which the container (27) is pressed
further (as indicated by arrow 29) with the receiver subassembly (50) and
pushes
the pin (5) back compressing spring (3). This movement opens the flow path (A)
between the receiving head (30) and the receiver subassembly (50).
Figures 60 and 61 indicate the third stage, in which the container (27) is
pressed
further (as indicated by arrow 31) with the receiver subassembly (50). This
movement pushes plug (17) forward compressing spring (21) where as the top
cap (23) remain stationary due to hindrance of bush (11) This movement opens
the flow path (B) between the receiver subassembly (50) and the liquid
container
(27) establishing liquid flow through the device. The sequence of operation
ensures that seal arrangements provided in the device open one after the other
due to positive linear movement of the container thereby preventing accidental
release of volatile liquid or vapour to the atmosphere. Disconnection of an
empty
or partly filled container from the device takes place in reverse sequence in
stages in a safe manner.
Figures 62 to 67, 68 to 75 and 76 to 86 illustrate variations of "push-push"
type
devices having variations in complementary mating components, but have
components similar to components i.e. plug (17), plug retainer (23) resilient
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WO 2010/109488 PCT/IN2010/000175
spring (21) and top cap (26) of the receiver subassembly that are shown in
figures 56, that essentially perform the same function.
In figure 56 the plug (17) and plug retainer (23) of the receiver subassembly
(50)
is positioned outside of the top cap (26) and the top cap (26) is provided
with
projections complementary to slots provided on the mating component of the
receiver subassembly. As compared to this, in figure 63 the slots are provided
on
receiver subassembly body (19). The above and other such differences in
positioning of the components and the relative shape alter the individual
component functions, illustrative of the various combinations that are
feasible but
essentially perform the same main function i.e. is to open and close the valve
assemblies in a preferred sequential manner.
While considerable emphasis has been placed herein on the particular features
of a device for transferring volatile liquids, the improvisation with regards
to it, it
will be appreciated that various modifications can be made, and that many
changes can be made in the preferred embodiment without departing from the
principles of the invention. These and other modifications in the nature of
the
invention or the preferred embodiments will be apparent to those skilled in
the art
from the disclosure herein, whereby it is to be distinctly understood that the
foregoing descriptive matter is to be interpreted merely as illustrative of
the
invention and not as a limitation.
29
