EP2526323A2

EP2526323A2 - A device for transferring volatile liquids from a container to a vaporizer

Info

Publication number: EP2526323A2
Application number: EP10755545A
Authority: EP
Inventors: Bikram Bhowmik; Rajesh Mishra; Manisha Sakhardande; Vijay Sharma
Original assignee: Piramal Healthcare Ltd
Current assignee: Piramal Enterprises Ltd
Priority date: 2009-03-24
Filing date: 2010-03-23
Publication date: 2012-11-28
Also published as: WO2010109488A2; WO2010109488A3; WO2010109488A4; JP2012521335A; CA2756699A1

Abstract

The invention embodies a device for transferring volatile fluid from a container to a receiver, including an anesthetic fluid, comprising a mechanism adapted 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, 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 desired sequence of opening and closing of the sealing elements is caused by relative motion of receiver subassemblies and include (a) rotate the receiver subassembly around its axis in two sequential actions concurrent to movement along its axis towards the receiver subassembly (b) rotate the receiver subassembly along its axis and then axially push the same towards the receiver subassembly, and (c) push the receiver subassembly into the receiver subassembly.

Description

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 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 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 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.

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. 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 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: (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 "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 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; 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 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 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 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; 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 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 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 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 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 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).

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- 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 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, Hand 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 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) 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 (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 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). 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. 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 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.

Claims

(1 ) 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.

(2) A device according to claim 1 (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.

(3) A device as claimed in claim 2, wherein said receiver subassembly further comprises: a hollow cylindrical housing member (19) defining an internal passage having an annular seat (23); a movable element (17) provided with a complementary sealing seat; and a resilient spring element (21) adapted to apply bias on said movable element. (4) A device as claimed in claim 2, wherein said receiver subassembly 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.

(5) A device as claimed in claim 2, wherein said receiver subassembly (50) and container (29) are provided with slots (22) and projecting formations (22a) complementary to one another.

(6) A receiver subassembly of claim 2 comprising a spring (3) loaded sealing arrangement to keep the mating surfaces of the arrangement in leak proof condition.

(7) A spring loaded sealing arrangement of claim 2 comprising 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.

(8) A device of claim 2 comprising at least one of the of the following: a. receiver sub-assembly (30) is threaded to the receiver, b. receiver subassembly (50) is threaded to the container (29). (9) A device as claimed in claim 2 comprising: a. ar^" receiver subassembly further comprising a hollow cylindrical housing member (19) defining an internal passage having an annular seat

(23); a movable element (17) provided with a complementary sealing seat; and a resilient spring element (21 ) adapted to apply bias on said movable element, b. a receiver subassembly 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, c. receiver subassembly (50) and container (29) are provided with slots (22) and projecting formations (22a) complementary to one another, d. receiver subassembly comprising a spring (3) loaded sealing arrangement to keep the mating surfaces of the arrangement in leak proof condition, e. the said spring loaded sealing arrangement comprising 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, and f. at least one of the of the following: (i) receiver sub-assembly (30) is threaded to the receiver, (ii) receiver subassembly (50) is threaded to the container (29).

(10) A device having features as claimed in claim 9, wherein 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.

(11 ) A device as claimed in claim 10, wherein the said relative movement in the operative receiver filling configuration comprises a 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 sealing elements to, respectively connect and disconnect said fluid passage path from the container to the receiver.

(12) A device as claimed in claim 10, wherein the relative movement in the operative receiver filling configuration comprises a 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.

(13) 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) rotating said receiver subassembly with reference to said receiver subassembly to open said sealing element 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, to stop said fluid transfer.

(14) A method of transferring volatile fluid from a container to a receiver, said method comprising the steps of:

(d) matching and assembling of said sub assemblies to one another, (e) rotating said receiver subassembly with reference to the receiver subassembly first and axially displacing 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 and rotating in an opposite direction in an operative stop-filling configuration, to stop said fluid transfer.

(15) A device as claimed in claim 10, wherein the relative movement in the operative receiver filling configuration comprises 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.

(16) A device as claimed in claim 15, comprising: an receiver subassembly (50) and receiver subassembly (30) that have complementary projection and internal opening respectively.

(17) A device as claimed in claim 16, wherein in an operative configuration said projection is adapted to slidingly enter said opening.

(18) A method of transferring volatile fluid from a container to a receiver, said method comprising the steps of:

(a) providing an receiver subassembly (50) configured to be secured to said container(29), (b) providing a receiver subassembly(30) 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) axially inserting said receiver subassembly in to said receiver subassembly 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. (19) A device and method for transferring volatile fluid from a container to a receiver as described herein, with reference to the accompanying drawings.