Fluid mixing device

Abstract

A connector for mixing two or more fluids, wherein the connector comprises a mixing chamber 12. The mixing chamber is configured for engagement with a nebuliser 14 and a venturi device 5 to mix the f

Description

Introduction The present invention relates to, but not limited to, connectors for mixing two or more fluids, especially to, but not limited to, connectors that may connect a nebuliser and a Venturi device to a delivery face mask. Chronic obstructive pulmonary disease (COPD) is a given name for a wide range of lung conditions that cause breathing difficulties. Besides lung conditions various other conditions or complications of the throat, sinus or nose that may benefit from fluids, for example medicaments, being delivery by breathing in these fluids by a person. For example, a blocked nose may sometimes be eased by warm water vapor being breathed in. Many people require continuous or periodic oxygen delivery supplement to aid their breathing. Many people may benefit from both additional oxygen delivery to their lungs as well as fluid, for example a fluid medicament, to be breathed in. Prior art methods may use a nebuliser run on an oxygen supply or just air supply; or use a nebuliser to supply a medicament while also using nasal cannula to supply oxygen, both methods only give uncontrolled, or poorly controlled, oxygen delivery. Use of nasal cannula may be uncomfortable. Some patients are critically reliant on fixed rate oxygen supply, and the removing of that fixed rate supply for even short periods of time, for example, to give separately only nebulised medication, or oxygen at un-metered concentration through a nebuliser (thus maybe greater or less amounts of oxygen then required), may be hazardous for these types of patients. Currently there is not an easy means to do both, provide a fixed rate supplementary oxygen delivery to a user’s lungs as well as provide a fluid, for example a fluid medicament to be breathed in, especially simultaneously, and especially maintaining a fixed rate of oxygen being delivered. The current invention aims to address at least some of the problems of the prior art. In particular the present invention aims to assist in giving a simple and easy means to provide nebulised substances, for example medication, and oxygen to a user, whilst importantly able to maintain the fixed rate of oxygen supply. Summary In a first aspect of the invention there is provided a connector for mixing two or more fluids, wherein the connector comprises a mixing chamber, wherein the mixing chamber comprises: - a first inlet port configured for engaging with a nebuliser and to receive fluid from a nebuliser into the mixing chamber; -a second inlet port configured for engaging with a Venturi device and to receive a fluid into the mixing chamber; and, -an exit port configured for engaging with a Venturi device, or a delivery face mask, or a fluid delivery system, or any combination of a Venturi device, a delivery face mask and fluid delivery system. In a second aspect of the invention there is provided a connector for mixing two or more fluids, wherein the connector comprises a mixing chamber, wherein the mixing chamber comprises: - a first inlet port configured for engaging with a nebuliser and to receive fluid from a nebuliser into the mixing chamber; -a second inlet port configured for engaging with a Venturi device and to receive a fluid into the mixing chamber; and, -an exit port configured for engaging with a Venturi device: wherein the second inlet port and the exit port are axially aligned and configured such that the second inlet port and exit port may releasably engage different portions of an engaged Venturi device. In a third aspect of the present invention there is provided a connector for mixing two or more fluids, wherein the connector comprises a mixing chamber, wherein the mixing chamber comprises: - a first inlet port configured for engaging with a nebuliser and to receive fluid from a nebuliser into the mixing chamber; -a second inlet port configured for engaging with a Venturi device and to receive a fluid; and, -an exit port configured for engaging with a Venturi device: wherein the second inlet port and the exit port are axially aligned and configured such that the second inlet port and exit port may releasably engage different portions of an engaged Venturi device, when engaged; and wherein the connector is configured to at least partially house a portion of an engaged Venturi device, when engaged, such that air vents of an engaged Venturi device are within the mixing chamber and that fluid from the mixing chamber is able to enter air vents of an engaged Venturi device. In another aspect of the present invention there is provided a connector for mixing two or more fluids, wherein the connector comprises a mixing chamber, wherein the mixing chamber comprises: - a first inlet port configured for engaging with a nebuliser and to receive fluid from a nebuliser into the mixing chamber; -a second inlet port configured for engaging with a Venturi device and to receive a fluid; and, -an exit port configured for engaging with a Venturi device: Venturi wherein the second inlet port and the exit port are axially aligned and configured such that the second inlet port and the exit port are each configured to at least partially surround at least a portion of a Venturi device when a Venturi device is engaged with both the second inlet port and the exit port, such that air vents of an engaged Venturi device are within the mixing chamber and that fluid from the mixing chamber is able to enter air vents of an engaged Venturi device. The present invention may enable simultaneous delivery to a user, of oxygen, for example a fixed or constant delivery rate of oxygen, and a fluid from a nebuliser, for example a nebulised medicament. A person skilled in the art will understand that a Venturi device for oxygen delivery will endeavour to give a fixed or constant delivery of oxygen but that there will be variables and tolerance to this and that an exact figure is what will happen in practice and that an exact figure is not necessary. The present invention recognises the problem of not easily providing fixed rate oxygen to a user or patient as well as providing nebulised fluids, for example, medication. Advantageously the present invention may provide a fixed rate oxygen and nebulised fluids, e.g. medication, simultaneously. The present invention in some embodiments may do this by running the nebulised fluid e.g. medication, though the air inlets of a fitted Venturi device. In some embodiments of the present invention the Venturi device is basically positioned or configured in a nebuliser’s immediate universe (vicinity) such that the Venturi device may entrain an air / fluid / drug / medication mix that may enable delivery of a fixed rate oxygen and nebulised fluid to a user simultaneously. Basically in some embodiments the nebulised substance may be entrained into the oxygen air mix of an engaged Venturi device to be able to deliver oxygen at the required rate and nebulised substance for example medication. In some embodiments the exit port of the connector is configured to engage with both a deliver mask and a Venturi device. In some embodiments the exit port of the connector is configured to engage a Venturi device and a face mask or the tubing to a face mask or nasal delivery system directly or through the Venturi device. It is foreseen that the connector of the present invention may in some embodiments, function as a nebuliser, or replace the function of the nebuliser that another nebuliser is not required to be engaged, or act as an adaptor, for example a universal adaptor, for the nebuliser to attach to or engage with. In some embodiments the connector may function with or without a nebuliser attached. In some embodiments a or any Venturi device engaged with the connectors may function to supply an oxygen containing gas to a user regardless if a nebuliser is attached to or engaged with the connector. In some embodiments the first inlet port may comprise a cap to seal the first port when a nebuliser in not engaged with the first port of the connector. In some embodiments the first port comprises a seal or valve that is airtight when a nebuliser is not engaged to prevent air or gas entering the mixing chamber. In some embodiments the first port comprises a seal or valve that is airtight when a nebuliser is not engaged to prevent air or gas entering the mixing chamber, opens automatically on engaging the nebuliser to enable releasably engagement of a nebuliser into the first inlet port but prevent air or gas to otherwise enter or exit from around the nebuliser. Advantageously the present invention may allow easy releasably engagement of a nebuliser to the connector, and therefore may allow easy use of a nebuliser with a breathing air source, for example a Venturi device. In some embodiments the first inlet port is configured for engaging with a nebuliser to form a fluid tight seal, between the connector and an engaged nebuliser. Advantageously this means that no air or fluid can enter the connectors around the sides a of nebuliser when a nebuliser is engaged with the first inlet port. This helps ensure that the nebulised substance travels towards the exit port or vents of an engaged Venturi device. In some embodiments the second inlet port, is configured for engaging with a Venturi device to form a fluid tight seal between the connector and an engaged Venturi device. Advantageously this means that no air or fluid can enter the connectors around the sides a of Venturi device when a Venturi device is engaged with the first inlet port. This helps that the gas or air and the nebuliser substances, which may act as a gas, are entrained into the oxygen or gas flow from the oxygen or breathe air source to the exit port and to any connected face mark or nasal tubing or the like, thus reducing of nebuliser substance escaping out of the mixing chamber or reducing the amount entrained by the gas flow from the Venturi device. In some embodiments the exit port, is configured for engaging with a Venturi device to form a fluid tight seal between the connector and an engaged Venturi device. Advantageously this means that no air or fluid can enter the connectors around the sides a Venturi device when a Venturi device is engaged with the first inlet port. This helps that the gas or air and the nebuliser substances, which may act as a gas, are entrained into the oxygen or gas flow from the oxygen or breathe air source to the exit port and to any connected face mark or nasal tubing or the like, thus reducing of nebuliser substance escaping out of the mixing chamber or reducing the amount entrained by the gas flow from the Venturi device. In some embodiments the first inlet port, for example the nebuliser engaging port, is upstream of the second inlet port, for example the Venturi device engaging port. Upstream being when normal flow of gas, when in use, from the nebuliser and or Venturi device to the exit port or an engaged face mark or nasal tubing or the like. In some embodiments the first and second inlet ports form a fluid seal between the connector and an engaged nebuliser or Venturi device. In some embodiments the exit port is configured to form a fluid tight seal between the connector and an engaged Venturi device, a delivery mask or a fluid delivery system, or any combination of Venturi device, delivery face mask or fluid delivery system. In some embodiments the second inlet port is configured to at least partially house a portion of a Venturi device when a said Venturi device is engaged with the second inlet port. In some embodiments the second inlet port is configured to at least partial surround a portion of a Venturi device when a Venturi device is engaged with the second inlet port. In some embodiments the exit port is configured to at least partial house a portion of a Venturi device when a said Venturi device is engaged with the connector or engaged with the second inlet port or engaged with the exit port or engaged with any combination of connector, second inlet port and exit port of the connector. In some embodiments the circumferential walls of the second inlet port are configured to form a channel. In some embodiments the circumferential walls of the second inlet port are configured to at least partial surround, or at least partially house, a portion of a Venturi device when a Venturi device is engaged with the second inlet port. In some embodiments the circumferential walls of the first inlet port are configured to form a channel. In some embodiments the circumferential walls of the first inlet port are configured to at least partial surround, or at least partially house, a portion of nebuliser when a Venturi device is engaged with the first inlet port. In some embodiments the circumferential walls of the exit port are configured to form a channel. In some embodiments the circumferential walls of the exit port are configured to at least partially surround at least a portion of a Venturi device when a Venturi device is engaged with the exit port. In some embodiments the channel of the exit port is wider in diameter at the outer end of the exit port than the diameter of the channel at an inner portion of the channel of the exit port. In some embodiments the second inlet port and the exit port are opposite each other. In some embodiments the second inlet port and the exit port are configured to be on a common axis. In some embodiments the second inlet port and the exit port are axially aligned. In some embodiments the second inlet port and the exit port are axially aligned and configured such that the second inlet port and exit port may releasably engage different portions of an engaged Venturi device. Advantageously this aids easy engagement of a Venturi device. It may also enable the one Venturi device to be disposed with the vents, or at least one of the vents, of the Venturi device, to be at least partially open to the inner volume of the mixing chamber. In some embodiments the connector is configured such that the Venturi device is disposed with the vents of the Venturi device open to the inner volume of the mixing chamber. This arrangement advantageously enables one Venturi device to be engaged partially within the connector held by two locations that do not block the vents of the engaged Venturi device. In some embodiments the exit port and the second inlet port are configured to releasably engage a Venturi device such that at least one or all of the air vents of the Venturi device is distanced, or spaced away from, the inner wall surface of the connector. Advantageously this aids that the air vents of an engaged Venturi device are not blocked and nebulised substances and or oxygen air mix may be easily entrained into the oxygen air mix and exit the Venturi device. In some embodiments the angle of the axis of the axially aligned axes of the second inlet port and exit port is angled to the vertical axis when in an orientation of use. In some embodiments the connector is configured that when in use the angle of the axis of the axially aligned axes of the second inlet port and exit port is angled between 25 and 75 degrees to the horizontal. In some embodiments the connector is configured that when in use the angle of the axis of the axially aligned axes of the second inlet port and exit port is angled between 30 and 70 degrees to the horizontal. Advantageously this may enable a good flow of fluid from the nebuliser through vents of an engaged Venturi device when the Venturi device is engaged with the second inlet port and exit port. In some embodiments the second inlet port and the exit port are each configured to at least partially surround at least a portion of a Venturi device when a Venturi device is engaged with both the second inlet port and the exit port. The at least portion of a Venturi device may be different portions. In some embodiments the second inlet port and the exit port are each configured to at least partially house at least a portion of a Venturi device when a Venturi device is engaged with both the second inlet port and the exit port. This is advantageous as having two housing means to an engaging Venturi device gives a simple but secure hold to any Venturi device being engaged with the connector. The configuration allows a quick and easy attachment means but also giving good security of hold with efficient use of space required to do so. In some embodiments the exit port comprises a flange configured to support a Venturi device when a Venturi device is engaged with the exit port. This enables an engaging Venturi device to be positioned correctly and may provide a fluid seal when the Venturi device is engaged with the exit port. It is foreseen that in some embodiments with a flange that the flange will be sized, shaped and configured to hold an engaged Venturi device, when a Venturi device is engaged, at the correct depth within the connector, to create a fluid seal at both the exit port and the second inlet port. Wherein the second inlet port comprises a circumferential wall which is configure to at least partially house or surround: 1 / a portion of a Venturi device; or, 2 / an oxygen entering portion of a Venturi device; or 3 / an oxygen source conduit or tubing of a Venturi device; or 4 / or any combination of the above 1, 2 and 3 features, when a Venturi device is engaged with the second inlet port. In some embodiments exit port of the connector, comprising a circumferential wall that is configured to at least partially house or surround: 1 / the upper portion of a Venturi device; or, 2 / the downstream portion of a Venturi device after the entraining portion of air into the Venturi device. To help explain the invention, by way of example in a non-limiting example or examples: In practice when fitting a Venturi device for engagement to the connector, the oxygen source conduit for fitting to a Venturi device may be unattached from the Venturi device, the Venturi device may be slid into the exit port such that the main body of the Venturi device goes through the connector and through the mixing chamber of the connector, such that the oxygen source connecting portion or port of a Venturi device may protrude through and out of the second inlet port allowing connection to the oxygen source conduit. In some preferred embodiments a Venturi device would break or open a seal at the second inlet port when engaging with the second inlet port such that when a portion of an engaged Venturi device protrudes through the second inlet port that the seal around an engaged Venturi device is again air and fluid tight, so that air or fluid does not enter through the second inlet port around the sides of a Venturi device engaged in the second inlet port In some preferred embodiments the conduit connecting to the oxygen source would connect to the Venturi device outside of the connector of the present invention but in alternative embodiments the conduit may connect to the Venturi device within the connector, for example partially within the connector. Likewise in some preferred embodiments when the Venturi device is engaged with the exit port there is a fluid seal formed around the Venturi device that is engaged in the exit port of the connector. In some embodiments the connector is configured such that a Venturi device would break or open a seal at the second inlet port when engaging with the second inlet port such that when a portion of the Venturi device protrudes through and out of the second inlet port that the seal around the Venturi device is again air and fluid tight, so that air or fluid does not enter through the second inlet port around the sides of a Venturi device engaged in the second inlet port. In some embodiments the second inlet port comprises a grommet. In some embodiments the second inlet port comprises a valve. In some embodiments the second inlet comprises a resealable or reclosing valve. In some embodiments the second inlet comprises an automatically reclosing or resealable valve. In some embodiments the valve of the second inlet port is a self-closing valve. In some embodiments the valve of the second inlet port is configured to open on engagement with a Venturi device and is configured to close on disengagement with a Venturi device. In some embodiments the valve of the second inlet port is configured to enable a portion of an engaged Venturi device to protrude out of the second inlet port. In some embodiments the valve of the second inlet port is configured to form a seal between the second inlet port and an engaged Venturi device. In some embodiments the exit port is configured to form a seal between the exit port and an engaged Venturi device. In some embodiments the second inlet comprises an automatically reclosing or resealable valve configured to enable engagement with a Venturi device or impermeable to the transfer of fluid in or out of the second inlet port when not engaged with a Venturi device. This has the advantage that the valve can be opened and closed easily, for example when engaging with a Venturi device and when not, and that only the fluid from a desired connected oxygen source may enter the connector through a Venturi device when engaged with the second inlet port while no other fluids enter or exit though the second inlet port. In some embodiments the second inlet port comprises a seal that is configured, that in a first configuration when there is not a Venturi device engaged with the second inlet port, to be fluid impermeable preventing fluid entering or exiting the connector through the second inlet port, and that the seal is also configured in an at least second configuration when a Venturi device is engaged with the second inlet port to enable engagement with a Venturi device but also configured to form a fluid impermeable seal around a Venturi device engaged with the second inlet port. Advantageously this may ensure that there is always some sort of a fluid seal at the second inlet port whether a Venturi device is fitted or not. This is useful as then the connector can be used as a nebuliser connector to a face mask without a Venturi device supplying oxygen, and increases the working options of the connector. In some embodiments the second inlet port comprises a valve wherein the valve comprises a dispensing valve or a split valve, for example a silicone split valve. In some embodiments the valve is configured to be biased closed and fluid tight when closed but is also configured to be openable when engaging a Venturi device with the connector and through the second inlet port. In some embodiments the valve is configured to form a fluid tight seal with an engaged Venturi device when engaged with the connector or second inlet port of the connector. Advantageously this may allow a quick and easy connection of a Venturi device to the connector, without the need of a separate or time-consuming sealing means. It also means that the connector can act as a connector from a nebuliser to a delivery face mask of other type of fluid delivery system without a Venturi device or oxygen source. In some embodiments the first inlet port comprises a grommet. In some embodiments the first inlet port comprises a valve. In some embodiments the first inlet comprises a resealable or reclosing valve. In some embodiments the first inlet comprises an automatically reclosing or resealable valve. In some embodiments the valve of the first inlet port is a self-closing valve. In some embodiments the exit port comprises a grommet. In some embodiments the exit inlet port comprises a valve. In some embodiments the exit inlet comprises a resealable or reclosing valve. In some embodiments the exit inlet comprises an automatically reclosing or resealable valve. In some embodiments the valve of the exit port is a self-closing valve. In some embodiments the exit port comprises connection means to connect to a face mask, nasal tubing or fluid delivery system means. In some embodiments the wall surface of the exit port comprises a connection means configured to engage with a mask or fluid delivery means. In some embodiments the exit port comprises a connection means that comprises screw threads configured to correspond to threads of a connector of a mask or fluid delivery system, for example nasal tubing. In some embodiments the exit port comprises a connection means that comprises screw threads configured to correspond to threads of a Venturi device. In some embodiments the second inlet port comprises a connection means that comprises screw threads configured to correspond to threads of a Venturi device. In some embodiments the exit port and the second inlet port comprises a connection means that comprises screw threads configured to correspond to threads of a Venturi device. Thus a Venturi device may be securely connected to either or both of the second inlet port and or the exit port. In some embodiments corresponding screw threads of the Venturi device and either of, or both of, the exit port and second inlet port may be configured to give a secure or airtight engagement when a Venturi device is engaged with the connector via the exit port, the second inlet port, or both the exit port and the second inlet port. In some embodiments the exit port comprises a corresponding friction fit component that is configured to correspond to a corresponding friction fit component of a Venturi device. The corresponding friction component of the Venturi device may be a surface of the Venturi device. In some embodiments the exit port is configured to have a friction fit component configured to enable a friction fit with a Venturi device. Advantageously this allows the two components to engage easily and disengage easily when required. In some embodiments the engagement is releasable engagement. In some embodiments the exit port comprises a connection means that comprises a friction-fit-surface configured to correspond to at least part of a surface of a Venturi device, to enable a secure or airtight engagement when the Venturi device is engaged with the exit port. In some embodiments the second inlet port comprises a connection means that comprises a friction-fit-surface configured to correspond to at least part of a surface of a Venturi device, to enable a secure or airtight engagement when the Venturi device is engaged with the second inlet port. In some embodiments the exit port and the second inlet port comprises a connection means that comprises friction-fit-surfaces that are configured to correspond to at least part of a surface of a Venturi device, to enable a secure or airtight engagement of the connector and the Venturi device. Thus a Venturi device may be securely and airtightly connected to either or both of the second inlet port and or the exit port. In some embodiments the first inlet port comprises a connection means that comprises screw threads configured to correspond to threads of a nebuliser, such that when a nebuliser is engaged with the first inlet port a secure or airtight engagement is achieved. In some embodiments the first inlet port comprises a friction-fit-surface configured to correspond to at least part of a surface of a nebuliser, such that when the nebuliser is fitted a secure or airtight engagement is achieved. Other embodiments of the invention may use different securing or engagement means to screws and I or friction-fit-surfaces to enable a secure or airtight seal or engagement of the nebuliser and / or Venturi device to the connector, for example but other mechanical engagement mechanism such as clips for example. It is foreseen that a person skilled in the art will understand that a mating engagement mechanism may have a part on one item and another corresponding mating part on another item and thus by the term mating mechanism includes in meaning that only part, of what may be the full mated mechanism, is on the connector. In some embodiment the nebuliser or the Venturi device or both the nebuliser and Venturi device may engage with a connector by a clip. In some embodiments the connector or engaging means or mechanism of the connector comprises friction-fit type surfaces or friction-fit means that a nebuliser and / or Venturi device can be engaged to a connector of the present invention by a push action that overcomes a certain amount of frictional force but once push passed this resistance, releasably holds the nebuliser and or Venturi device firmly engaged with the connector. To release the nebuliser and / or Venturi device from the connector an opposition direction force to engaging for example a pull or separating force, by a user, to separate an engaged nebuliser and or Venturi device from the connector. In practice with these friction-fit type or friction-fit type means embodiments, the pull or separating force may overcome some resistance force before separating but both the connector and / or nebuliser may be configured and manufacture to be strong enough to maybe flex in shape enough to allow the engaging and disengaging of the two parts without breaking and both may be useable in theory. Such engaging mechanisms are known in practice. Other embodiments may have different engaging mechanisms. In some embodiments, the inner wall surface of the mixing chamber and or connector comprises a sloping or angled portion for example adjacent, or near, to the second inlet port configured that nebulised substance that condenses on the inner wall surface of the mixing chamber and or connector may flow back into the engaged nebuliser. Advantageously this may reduce waste of the nebulised substance. In some embodiments the engaging mechanism of the first inlet port to engage a nebuliser comprises a friction-fit mechanism. The friction-fit mechanism may comprise corresponding mating parts for example male and female parts that are configured to releasably engage. In come embodiments the friction-fit mechanism comprises corresponding one or more ridges and grooves, for example, circumferential grooves and ridges on one or more or both of the mating surfaces of an engaging nebuliser and the connector of the present invention. In some embodiments the connector comprises the male or smaller fitting corresponding mating part of the friction-fit mechanism configured to mate and releasable engage with a corresponding female or larger friction-fit mechanism part of a friction-fit mechanism. Advantageously this aids that condensed nebulised substances from the mixing chamber 12 may flow back into an or the engaged nebuliser 14. Figure 8 shows and embodiment showing a cross sectional view where the smaller (male) friction-fit mechanism part is within the larger corresponding (female) friction-fit mechanism part thus enabling liquid within the mixing chamber to flow back into the nebuliser reducing waste. In some embodiments the engaging mechanism to engage a nebuliser and or Venturi device to the connector comprises a snap fit or other mechanical type engaging mechanism. In some embodiments the engaging mechanism to engage a nebuliser and or Venturi device to the connector comprises an interference fit or other mechanical type engaging mechanism. Advantageously the connector provides an easy connection for the mixed fluids from a nebuliser and oxygen from a Venturi device to be supplied to a user via a face mask or fluid delivery system, for example nasal tubing. In some embodiments, the exit port is configured that it may function both to at least partially house an engaging Venturi device as well as simultaneously connect to a face mask or fluid delivery means like nasal tubing; or may function solely to connect to a face mask or fluid delivery means. In some embodiments the exit port comprises an engagement mechanism to connect to a fluid delivery face mask or fluid delivery system. In some embodiments the engagement mechanism comprises screw-threads that are configured to correspond to screw-threads of a Venturi device. In some embodiments the connector is configured that the second inlet port and the exit port are configured to releasably engage to standard sized fixed rate medical Venturi devices. The industry has current standard sizes of nebulisers and venturi devices so that these may be used interchangeable with other standard sized equipment. This does not exclude ranges and different designs, and does not exclude changes to the standard sizes. For example, currently, although not limited to, it is common that for both air for driving a nebuliser, and oxygen input for the Venturi devices may be connected to 8 millimetre outer diameter (5 millimetre inner diameter) tubing. Currently, but not limited to, this tubing often has a silicone type connector on each end that is an oversized female aperture. Commonly but not limiting to, the air I oxygen outlets and equivalent inlets on the nebuliser and Venturi devices respectively use either a tapered or barbed male connector to secure the pipe. Some known standard Venturi devices that may be used with the present invention (but not limited to only these devices) and that have standard connection sizes used in the industry to readily connect to other equipment likely to be needed for example oxygen and breathing air sources and facemasks and nasal tubing include the colour coded Venturi devices from Intersurgical Inc, as listed below in table 1. Table 1 Colour 02 Flow Rate (L / min) 02 Concentration delivered (%O2) Step (%O2) Blue - White 4 28% 4% Orange 6 3% Yellow 4% BjllJ 20%^ Typically these Venturi devices may have an outer diameter of 6 millimetres to 6.5 millimetres tapered surface over a 15 millimetres length with a straight non-tapered length with for a larger out diameter of for example around 20.6 millimetres and maybe an outer section (opposite of the oxygen connecting end) of an even greater outer diameter maybe of, for example 26, millimetre, and an inner diameter of for example around 21.9 millimetres. In practice in some situations the face mask may have a corresponding mating connection that fits within this top section of the Venturi device. Other known Venturi devices that may be suitable for use with the present invention include variable Venturi devices for example Silente (Trade Mark of Intersurgical Inc.), Multi Ox (Trade Mark of Intersurgical Inc.) and Dual (Trade Mark of Intersurgical Inc.) Venturi devices. Variable Venturi devices may enable different fix or constant rate of oxygen delivery, which may be selected by a user for example by further opening or closing air vents of the variable Venturi Device or supplying different flow rates of oxygen or breathe gas into the variable Venturi device. Advantageously variable Venturi devices may allow one device to be fitted that can supply more than one fixed rate of oxygen when selected. The specific examples of Venturi devices and nebulisers and tubing given herein are to assist in the understanding of the invention but not to be in any limiting sense and in other embodiments other types of nebulisers and Venturi devices may be used with conduits and gas sources as known to the person skilled in the art. In some embodiments of the connector of the present invention may hold, or releasably engage a Venturi device while still allowing a face mask or nasal tubing to releasably engage with the Venturi device when the Venturi device is releasably engaged with the connector of the present invention. In some embodiments the connector is configured that the first inlet port is configured to releasably engage to standard sized nebulisers. Known nebulisers, that may be used with the connector of the present invention include but not limited to the Cirrus II (Trade Mark of Intersurgical Inc) range. In some embodiments the connector comprises a Venturi portion, wherein the Venturi portion is configured to enable delivery of a fixed rate of oxygen when connected to an oxygen and air supply. In some embodiments the connector comprises a Venturi portion integrally attached with the connector wherein the Venturi portion is configured to enable delivery of a fixed rate of oxygen, when connected to an oxygen and air supply. In some embodiments the connector and Venturi portion is integrally manufactured from plastic. Thus in some embodiment the Venturi device is part of the connector and thus can be fitted with a nebuliser or in some embodiments there will also be a nebuliser portion too, integral with the connector. This may have the advantage of a one piece manufacturing process. The size of the Venturi portion or the air vents of the Venturi portion may be manufactured at different sizes as desired to reflect the required fixed rate of oxygen required to be delivered. In some embodiments the connector comprises a nebuliser portion, wherein the nebuliser portion is configured to enable delivery of a fluid when connected to an air supply and loaded with a liquid for dispensing. In some embodiments the connector comprises a Venturi portion integrally attached with the connector wherein the nebuliser portion is configured to enable delivery of a fluid when connected to an air supply and loaded with a liquid for dispensing. In some embodiments the connector and nebuliser portion is integrally manufactured from plastic. Thus in some embodiment the nebuliser portion / device is part of the connector and thus can be fitted with a Venturi device or in some embodiments there will also be a Venturi portion too integral with the connector. This may have the advantage of a one piece manufacturing process. The size of the nebuliser portion or the air vents and liquid store of the nebuliser portion may be manufactured at different sizes as desired to reflect the required delivery fixed rate of fluid or medication required to be delivered. In some embodiments the Venturi portion of the connector is configured to receive Oxygen at a variety of different specific rates in order to entrain a specific flow of air mixed with nebulised solution. For example but by no means limiting in some embodiments the Venturi portion is configured to receive Oxygen at a rate of 4 to 6, 6 to 8, 8 to 10, 10 to 12 or 12 to 15 litres of oxygen per minute in order to entrain a specific flow of air mixed with nebulised solution. In some system embodiments the Venturi portion is configured to enable oxygen delivery at a rate of 24 percent (%) or 28% or 31 % or 35 % or 40 % or 60 % oxygen. In some embodiments the connector comprises an air inlet. In some embodiments the air inlet is configured to enable air flow into the chamber of the connector. In some embodiments the air inlet is configured to selectively enable air flow into the chamber of the connector. In some embodiments the air inlet is configured to be resealable such that in some configurations it is airtight and in other configurations air may pass into the mixing chamber of the connector. It is foreseen that in embodiments with an air inlet, an aperture in the wall of the connector, that air may flow into the mixing chamber of the connector. In embodiments where it is not desired to have air flow out of the mixing chamber of the connector the air inlet may be selectively openable or closable. In some embodiment the selectively openable or closable means may comprise a valve. In some embodiments the valve may comprise of any of, or combination of: flap valve, stop-check valve, umbrella valve, diaphragm valve, duckbill valve, split valve, hinge valves, swing valves, flapper valves, and Tesla valves. In some embodiments the air inlet is completely open. In some embodiments the air inlet comprises slots, mesh, vents. Thus, in some embodiments the air inlet may comprise a plurality of openings. In some embodiments the air inlet comprises a controlled air duct, a controlled opening and closing mechanism. The term “air inlet” may include the plural “air inlets” and may comprise a plurality of air inlets. In some embodiments the mixing chamber comprises a pressure relief valve. In some embodiments the mixing chamber comprises one or more pressure relief valves. In some embodiments the air inlet comprises a pressure relief valve. In some embodiments the air inlet comprises one or more pressure relief valves. The valves may be used and configured to control the flow of air into and out of the mixing chamber of the connector. In some embodiments a valve may be configured to prevent air flow out of the mixing chamber of the connector. In some embodiments the valve may be configured to restrict partially of fully as required, the flow of air into or out of the mixing chamber of the connector. Ideally embodiments of the present invention will have enough airflow not to restrict air flow to a user but restricted enough that a significant amount, greater than 50 percent (%), or all of the nebulised substance is consumed by the Venturi device to deliver to a user. In some embodiments the pressure relief valve comprises an umbrella valve or a flap valve, or both an umbrella valve and a flap valve. In some embodiments the mixing chamber comprises an umbrella valve or a flap valve. In some embodiments there is a plurality of umbrella valves or flap valves or both a plurality of umbrella valves and a plurality of flap valves. In some embodiments the valve may comprise of any one or more of, or combination of: flap valve, stop-check valve, umbrella valve, diaphragm valve, duckbill valve, split valve, hinge valves, swing valves, flapper valves, and Tesla valves. This is not an exhaustive list and other embodiments comprise one or more of other types of valves. In some embodiments the mixing chamber is configured that when a Venturi device is engaged with the connector, that air or fluid that is entrained into the Venturi device, for delivery to a user, for example a patient, that the said air or fluid entrained, is from the mixing chamber, or from an engaged nebuliser or from both the mixing chamber and an engaged nebuliser. In some embodiments the mixing chamber is configured that the air or fluid mixing with the oxygen and fluid from an oxygen source to form an oxygen, air, fluid mix fluid comprises air or fluid, or both air and fluid from the mixing chamber or from an attached nebuliser. The difficulty however may be that the flow rates of the or any nebuliser and Venturi device used may not be the same and thus cause issues. If the flow rate is hindered and too low there may be restricted flow for the user and not good mixing of the oxygen from the Venturi device and the gas or liquid vapour or medicament from the nebuliser. If too much of a flow rate, then substances from the nebuliser or the oxygen from the Venturi device may be too diluted than what is required for the user. The present invention seeks to address these issues. In some embodiments the air inlet is 30 millimetres square in area of the opening. In some embodiments the opening of the air inlet is 30 millimetres square in area. In some embodiments the air inlet is equal to or greater than 30 millimetres square in area. In some embodiments the opening of the air inlet is equal to or greater than 30 millimetres square in area. In some embodiments the opening area of the air inlet is 0.3 % of the total outer surface area of the connector. In some embodiments the opening of the air inlet is greater than 0.3 % of the total outer surface area of the connector. The term “air inlet” as used herein may mean the plural “air inlets” but for completeness: In some embodiments the total open area of an air inlet or air inlets of the connector is 30 millimetres square in area of the opening or openings. In some embodiments the opening or openings of the air inlet or air inlets is 30 millimetres square in area. In some embodiments the total open area of an air inlet, or air inlets, is equal to or greater than 30 millimetres square in area. In some embodiments the open area of the air inlet, or air inlets, is equal to or greater than 30 millimetres square in area. In some embodiments the total opening area of the air inlet, or air inlets, is 0.3 % of the total outer surface area of the connector. In some embodiments the opening area of the air inlet, or total open area of air inlets, is greater than 0.3 % of the total outer surface area of the connector. In some embodiments the opening of the air inlet, or total opening area of air inlets, is 1500 millimetres square in area. In some embodiments the open area of an air inlet, or total area of air inlets, is equal to or less than 1500 millimetres square in area. In some embodiments the total opening area of the air inlet, or air inlets, is 15 percent(%) of the total outer surface area of the connector. In some embodiments the total opening area of the air inlet, or air inlets, is less than 15 percent (%) of the total outer surface area of the connector. In some embodiments the open area of an air inlet, or total open area of air inlets, is between 30 millimetres square in area and 1500 millimetres square in area. In some embodiments the open area of the air inlet, or total open area of the inlets, is between 0.3 and 15 percent of the total outer surface area of the connecter. Ideally in some embodiments the opening of the air inlet will be round or circular but in other embodiments it may be other shapes. Ideally in some embodiments the opening of the air inlet will be round or circular but in other embodiments it may be other shapes. In some embodiments the connector further comprises an air inlet, or air inlets wherein the total open area of the air inlet, or air inlets, is between 0.3 and 15 percent of the total outer surface area of the connecter. In some embodiments: a / the total open area of an air inlet or air inlets is between 0.3 and 15 percent of the total outer surface area of the connecter; or, b / the total open area of the air inlet, or air inlets is between 30 millimetres square and 1500 millimetres square; or, c / the total open area of an air inlet or air inlets is between 0.3 and 15 percent of the total outer surface area of the connecter and the total open area of the air inlet, or air inlets is between 30 millimetres square and 1500 millimetres square. In some embodiments the total open area of the air inlet, or air inlets is both, between 0.3 percent and 15 percent of the total outer surface area of the connecter; and the total opening area of the air inlet, or total opening area of air inlets, in area is between 30 millimetres square and 1500 millimetres square. Advantageously the present invention aids that there may be sufficient air or gas flow to an engaged Venturi device to function as desired to draw other air gas mix to supply an oxygen rich gas mix to a user, but also sufficiently restricted in flow as to ensure that an engaged Venturi device significantly, primarily or entirely consumes the nebulised gas or air, to ensure a user is supplied with the desired amount of nebulised gas, air, vapour, medication or substances. And thus advantageously the correct desired fixed rate of oxygen and correct desired amount of nebulised substance may be delivered to a user, and may be delivered simultaneously. In some embodiments the internal volume of the mixing chamber of the connector is 60000 millimetres cubed. In some embodiments the mixing chamber of the connector is configured to at least partially surround the entraining vents of an engaged Venturi device when such a Venturi device is engaged with the connector. In some embodiments the mixing chamber, or the air inlet, comprises a pressure relief valve, configured to be biased to be closed and configured to open when a predetermined pressure within the mixing chamber is reached. In some embodiments the mixing chamber, or the air inlet, comprises a pressure relief valve, configured to be biased to be closed and configured to open when the pressure within the mixing chamber is below atmospheric pressure outside of the mixing chamber. In some embodiments the pressure relief valve is a one-way valve. In some embodiments the pressure release valve is an umbrella valve, or a flap valve. In some embodiments the pressure release valve may comprise of any of, or combination of: flap valve, stop-check valve, umbrella valve, diaphragm valve, duckbill valve, split valve, hinge valves, swing valves, flapper valves and Tesla valve. In some embodiments the pressure relief valve is a one-way valve configured to allow fluid into the mixing chamber. For example, air. Having a pressure release valve able to allow air into the mixing chamber is a helpful comfort and or safety feature that should a user inhale a large volume of fluid, for example an air mix, that the volume or speed of inhaling is larger or faster than the mixing chamber with any engaged Venturi device or nebuliser can normally deliver to a user than air can be brought into the mixing chamber and delivered to a user and not discomfort or stress the user. Ideally in essence some embodiments of the present invention will allow the connector with an engaged Venturi device and or engaged nebuliser to breathe normally meaning to give or deliver the desired rated oxygen levels and nebulised substance to a user. As mentioned above having a controlled amount of air enter the mixing chamber may also help flow of the gases and substances through the connector and maybe to ensure that the correct amount of fixed rate oxygen or breathe air and correct amount of nebulised substance exits the connector and is conveyed to a user. In some embodiments the pressure relief valve is a one-way valve configured to allow air into the mixing chamber from outside of the mixing chamber or outside of the connector when the fluid pressure within mixing chamber is below the external pressure. In some embodiments the pressure relief valve is a one-way valve configured to allow air into the mixing chamber from outside of the mixing chamber or outside of the connector when the fluid pressure within mixing chamber is below the external pressure by a pre-determined amount. In some embodiments the pressure relief valve is a one-way valve configured to allow air into the mixing chamber from outside of the mixing chamber or outside of the connector, when the fluid pressure within mixing chamber is below the external pressure by a pre-determined amount, for example 5 % or 10 % below in pressure. In some embodiments the pressure release valves will open when the pressure difference across it is of 5 or 10 percent greater or more. In some embodiments the pressure relief valve is a one-way valve configured to allow air into the mixing chamber from outside of the mixing chamber or outside of the connector when the fluid pressure within mixing chamber is below a predetermined amount. In some embodiments the pressure relief valve is a one-way valve configured to allow air into the mixing chamber from outside of the mixing chamber or outside of the connector when the fluid pressure within mixing chamber is above a predetermined amount. In some embodiments the air inlet and or the pressure relief valve is downstream of the first inlet port. In some embodiments the air inlet and or the pressure relief valve is downstream of the inlet port configured to be engaged with a nebuliser. In some embodiments the air inlet and or the pressure relief valve is upstream of the second inlet port. In some embodiments the pressure relief valve is upstream of the second inlet port valve configured for engagement with a Venturi device. In some embodiments the pressure relief valve is between the first and second inlet ports with regard to the direction of fluid flow when in use. In some embodiments the air inlet and or pressure relief valve is downstream the second inlet port. In some embodiments the air inlet and or pressure relief valve is downstream of the inlet port configured for engagement with a Venturi device. In some embodiments the air inlet and or pressure relief valve is positioned between the first inlet port and the second inlet port. In some embodiments the air inlet and or pressure relief valve is positioned between the (second) inlet port configured for engagement with a Venturi device and the (first) inlet port configured for engagement with a nebuliser. It is foreseen that air or gas flow between an engaged nebuliser and an engaged Venturi device when engaged to the same connector will occur naturally. The connector is configured such that air vents of the Venturi device are open to the mixing chamber of the connector thus the draw of an engaged Venturi device will naturally draw the gas, air or substances from the nebuliser, and air inlet if present and open. This can be achieved due to the volume of the mixing chamber of the connector. In some embodiments there comprises a flow control device to direct nebulised gas, vapour or substances to the Venturi device. In some embodiments the internal surfaces of the connector comprise at least one channel from the nebuliser to the air vents of the Venturi device. In some embodiments the mixing chamber comprises a fluid mixing element. In some embodiments the mixing chamber comprises a baffle. In some embodiment the baffle comprises a flexible protrusion within the mixing chamber. A baffle or other mixing element may help mix the fluids within a mixing chamber. In some embodiments the mixing chamber is configured to mix fluid. This may be that the internal walls help mix the fluids within the mixing chamber. In some embodiments the mixing chamber is partially cylindrical in shape. Circular side walls may assist in mixing of fluids within the mixing chamber. In some embodiments the walls of the exit port protrude from the outer wall surface of the connector, or mixing chamber of the connector. In some embodiments the walls of the exit port protrude from the upper surface of the connector when in an orientation of use. This may aid the flow of nebulised substances and or oxygen and or breathing gas to the user, it may also aid a secure hold or engagement of an engaged Venturi device by the exit port. In some embodiments the first inlet port is positioned at the lower surface of the connector, (when orientated for use, such that the fluid generally rises). This may assist nebulising a fluid. In some embodiments the first inlet port is positioned at the lower surface of the connector, when orientated for use; or the exit port is positioned protruding from the upper surface of the connector; or the inlet port is positioned at the lower surface of the connector and the exit port protrudes from an upper surface of the connector, when orientated for use. In some embodiments the first inlet port is positioned at an opposite surface of the connector to the surface wherein the exit port protrudes from. In some embodiments part of the internal surface of the connector is sloped to the exit of an engaged nebuliser, configured that any nebulised fluid or substances that condenses out of suspension and condenses on the mixing surface of the connector may flow back into the nebuliser. In some embodiments the second inlet port is positioned at the lower surface of the connector, (when orientated for use, such that the fluid generally rises) In some embodiments the mixing chamber has a sloping or angled internal surfaces, (when orientated for use, such that the fluid generally rises). This may help to mix the fluids in the mixing chamber. In some embodiments the mixing chamber has a sloping or angled uppermost surface, (when orientated for use, such that the fluid generally rises). This may help direct the fluid out though the exit port of the connector. In some embodiments the upper surface of the mixing chamber comprises a sloping or angled portion connecting to the exit port. In some embodiments the uppermost surface of the mixing chamber comprises a sloping or angled portion connecting to the exit port at the highest point of the upper surface of the mixing chamber, (determined when orientated for use, such that the fluid generally rises). Advantageously this may help direct gas and nebulised substances to the vents of an engaged Venturi device. Additionally fluid that condenses out of suspension in the aerosol created by the nebuliser gets stuck in the chamber or lost to the atmosphere, but may return to the nebuliser by gravity to be nebulised once more. In some embodiments the connector comprises plastic. Being made of plastic may mean an easy and cheap manufacturing process to easily manufacture different shaped connectors. Plastic can be strong, long lasting but also flexible for friction fit mechanisms. In some embodiments the connector comprises a wall substantially enclosing a mixing chamber. In some embodiments the wall comprises an outer and inner wall or wall surface. In some embodiments the inner wall surface largely defines a mixing chamber. In some embodiments the exit port, first inlet port and second inlet port are openings within the wall of the connector. In some embodiments there are one or more air inlets which are also openings in the wall. In some embodiments any one or more, or none, of any exit port, first inlet port, second inlet port and / or air inlet if present may comprise a valve. It is foreseen that the any valves function to have an open and closed configuration, where when in an open configuration may allow gas or air to pass through and when in a closed configuration substantially prevent gas passing through the valve and thus the opening into or out of the mixing chamber of the connector. In some embodiments any one or more, or none, of any exit port, first inlet port, second inlet port and / or air inlet if present may comprise a circular aperture in the wall of the connector. In other embodiments any one or more, or none, of any exit port, first inlet port, second inlet port and / or air inlet if present may comprise a noncircular aperture in the wall of the connector. In practice, in some embodiments, it is foreseen that connector would be orientated that the exit port of the connector, for engaging with a Venturi device would be above, or higher, in orientation then the first inlet port. In some embodiments the exit port is configured for mating with a corresponding mating surface of a Venturi device to be engaged with the connector. In some embodiments the second inlet port is configured for mating with a corresponding mating surface of a Venturi device to be engaged with the connector. In some embodiments the exit port is configured to surround a portion of an engaged Venturi device. In some embodiments the connector is configured to surround a portion of an engaged Venturi device. In some embodiments the second exit port is configured to surround and contact a portion of an engaged Venturi device. In some embodiments the connector is configured to surround and contact at least two different portions of an engaged Venturi device. In some embodiments both the exit port and the second inlet port surround and contact different portions of an engaged Venturi device. In some embodiments both the exit port and the second inlet port surround and contact different portions of an engaged Venturi device producing an airtight seal around the engaged Venturi device. In some embodiments the connector is configured that an engaged Venturi device sits on a portion of the inner wall of the connector. In some embodiments an engaged Venturi device sits on at least two portions of the inner wall of the connector. In some embodiments of the connector the inner wall of the connector comprises one of more flanges. In some embodiments of the connector comprising one or more flanges, each flange is / are configured to abut with a portion of an engaged Venturi device. In some embodiments an engaged Venturi device may sit within the exit port and second inlet port such that the oxygen connecting portion of an engaged Venturi device protrudes from the second inlet port of the connector. In some embodiments the connector is configured such that an engaged Venturi device may sit within the exit port and second inlet port such that the oxygen connecting portion of an engaged Venturi device protrudes from the second inlet port of the connector. In some embodiments the connector is configured such that an engaged Venturi device may sit within the exit port and second inlet port such that an engaged Venturi device is releasably held or engaged. In some embodiments the connector is configured such that an engaged Venturi device may sit within the exit port and second inlet port such that an engaged Venturi device is releasably held or engaged and the exit port and second inlet ports airtightly hold the engaged Venturi device such that gas is substantially prevent from passing into or out of the connector around an engaged Venturi device. In some embodiments there are further engagement mechanisms to releasably engage the Venturi device with the connector, for example but not limited to clips, or frictional fit mechanism or screw mechanism. In some embodiments the exit port and or one or more flanges of the exit port or connector are configured to abut a portion of an engaged Venturi device, above the air vents of an engaged Venturi device, when in an orientation of use. In some embodiments the exit port and or one or more flanges of the exit port or connector are configured to abut a portion of an engaged Venturi device, above the air vents of an engaged Venturi device, when in an orientation of use, such that the air vents of an engaged Venturi device are open or substantially open within the mixing chamber. By “open” here it is meant to include in meaning: not blocked by a wall of the connector. In some embodiments the second inlet port and or one or more flanges of the second inlet port or connector are configured to abut a portion of an engaged Venturi device, below the air vents of an engaged Venturi device, when in an orientation of use. In some embodiments the second inlet port and or one or more flanges of the second inlet port or connector are configured to abut a portion of an engaged Venturi device, below the air vents of an engaged Venturi device, when in an orientation of use, such that the air vents of an engaged Venturi device are open or substantially open within the mixing chamber. By “open” here it is meant to include in meaning: not blocked by a wall of the connector. In some embodiments of the connector the exit port and second inlet port are configured to engage a Venturi device such that the air vents of an engaged Venturi device are within the mixing chamber. In some embodiments of the connector the exit port and second inlet port are configured to engage a Venturi device such that the air vents of an engaged Venturi device are within the mixing chamber and are all air vents are open. In some embodiments of the connector the exit port and second inlet port are configured to engage a Venturi device such that the air vents of an engaged Venturi device are within the mixing chamber of the connector spaced away from the inner wall surface of the connector. In some embodiments of the connector the exit port and second inlet port are configured to engage a Venturi device such that the air vents of an engaged Venturi device are within the mixing chamber, surrounded by the enclosed free space of the mixing chamber. Likewise in practice, in some embodiments, it is foreseen that connector would be orientated that the second inlet port of the connector, for engaging with a nebuliser would at the lower side or face of the connector, in orientation in use. This orientation may enable nebulised substances to rise and be drawn, or entrained, to an engaged Venturi device and to aid return of condensed nebulises to the nebuliser. In use there may always be some nebulised substance form on the inner wall surface of the mixing chamber or connector. Advantageously in some embodiments the connector is configured by sloping inner surfaces to aid flow of condensed liquid or solutions or condensed nebulised substance to flow easily back to the nebuliser. In some embodiments the connector is sized, shaped and configured to engaged with a nebuliser and or a Venturi device. In some embodiments exit port of the connector is sized, shaped and configured to engaged with a portion of a Venturi device. In some embodiments second inlet port of the connector is sized, shaped and configured to engaged with a portion of a Venturi device. In some embodiments first inlet port of the connector is sized, shaped and configured to engaged with a portion of a nebuliser. In another aspect of the present invention there is provided a mask for delivering oxygen, air and another fluid for example droplets of a medicament to a user, wherein the mask is configured for application to a user to supply fluid to a user and to cover the nose and mouth of a user; the mask comprises: a connector as herein described. In another aspect of the present invention there is provided a mask for delivering oxygen, air and another fluid for example droplets of a medicament to a user, wherein the mask is configured for application to a user to supply fluid to a user and to cover the nose and mouth of a user; the mask comprises: a mixing chamber; - a first inlet port configured for engaging with a nebuliser and to receive fluid from a nebuliser into the mixing chamber; -a second inlet port configured for engaging with a Venturi device and to receive a fluid into the mixing chamber. In some embodiments a lower portion of the mask comprises the mixing chamber. In another aspect of the present invention there is provided a system, for mixing fluids for delivery to a user, comprising a connector or face mask as herein described. In some embodiments of the system, the system further comprises a nebuliser. In some embodiment of the systems, the system further comprises a Venturi device. In some embodiments of the system, the system further comprises an oxygen Venturi device. In some embodiments of the system the Venturi device is disposed with at least partially, at least one of the vents of the Venturi device open to the inner volume of the mixing chamber. In some system embodiments the Venturi device is configured to delivery directly or indirectly to a patient an oxygen air fluid mix. In some system embodiments the Venturi device is configured to receive Oxygen at a known rate in order to entrain a specific flow of air mixed with nebulised solution. In some system embodiments the Venturi device is configured to receive Oxygen at a variable rate depending on the requirements of the Venturi device used in order to entrain a specific flow of air mixed with nebulised solution. In some system embodiments the Venturi device is configured to receive Oxygen at a variety of different specific rates in order to entrain a specific flow of air mixed with nebulised solution. For example but by no means limiting in some system embodiments the Venturi device is configured to receive Oxygen at a rate of 4 to 6, 6 to 8, 8 to 10, 10 to 12 or 12 to 15 litres of oxygen per minute in order to entrain a specific flow of air mixed with nebulised solution. In some system embodiments the Venturi device is configured to enable oxygen delivery at a rate of 24 percent (%) or 28 percent (%) or 31 percent (%) or 35 percent (%) or 40 percent (%) or 60 percent (%) oxygen. In another aspect of the present invention there is provided a method of mixing two or more fluids comprising the steps of using a connector as described herein, or a face mask as described herein, or a system as described herein. In another aspect of the present invention there is provided a method of mixing two or more fluids, comprising the steps of using a connector as herein described and further comprising the steps of: connecting a nebuliser to a first inlet port of the connector such that fluid exiting the nebuliser will exit into the mixing chamber of the connector, wherein the nebuliser comprises a fluid for delivery to a user; - connecting via the exit port, a Venturi device to a second inlet port of the connector, by passing or sliding a Venturi device through the exit port until an oxygen source connector portion of a Venturi device protrudes though the second inlet port and optionally a valve of the second inlet port if said valve is present and the second inlet port at least partially houses a portion of an engaging Venturi device and until an engaging Venturi device cannot move any further into the connector and is held by the connector; connecting an oxygen source conduit to an engaged Venturi device via an oxygen source connector portion of a Venturi device, that at least partially protrudes through the second inlet port and optionally a valve of the second inlet port if said valve is present; - activating the nebuliser such that fluid is delivered to the nebuliser and that fluid exits the nebuliser into the mixing chamber; activating the supply of oxygen to the Venturi device such that the Venturi device entrains fluid from the mixing chamber and delivers fluid out of the exit port for example to a user via a face mask, nasal tubing or fluid delivery system. In another aspect of the present invention there is provided a method of mixing two or more fluids, comprising the steps of using a facemask as herein described and further comprising the steps of: connecting a nebuliser to a first inlet port such that fluid exiting the nebuliser will exit into the mixing chamber, wherein the nebuliser comprises a fluid for delivery to a user; connecting via the exit port, a Venturi device to a second inlet port, by passing or sliding a Venturi device through the exit port until an oxygen source connector portion of a Venturi device protrudes though the second inlet port and optionally a valve of the second inlet port if said valve is present, and the second inlet port at least partially houses a portion of an engaging Venturi device and until an engaging Venturi device cannot move any further into the connector and is held by the connector; connecting an oxygen source conduit to an engaged Venturi device via an oxygen source connector portion of a Venturi device, that at least partially protrudes through the second inlet port and optionally the valve of the second inlet port if said valve is present; - Activating the nebuliser such that fluid is delivered to the nebuliser and that fluid exits the nebuliser into the mixing chamber; activating the supply of oxygen to the Venturi device such that the Venturi device entrains fluid from the mixing chamber and delivers fluid out of the exit port for example to a user via a face mask. In another aspect of the present invention there is provided a method for supplying a fixed rate of oxygen and a medicament comprising using a connector, face mask, system or method as described herein. To help describe the invention and how it is used, a non-limiting embodiment will be described in use. In this embodiment a Venturi device not yet connected to oxygen air source is engaged with the connector by inserting the Venturi device into the exit port of the connector with the oxygen connection portion end first (of the Venturi device) into the exit port until the Venturi device is engaged with the connector. Different embodiments may have different means and mechanisms to releasably engage / secure the Venturi device with the connector. In some embodiment these may be by a friction fit. In some embodiment this may be by one or more flanges on the inner wall surface of the exit port that the Venturi device may sit on. In some embodiment a portion of the Venturi device will abut on an inner wall surface of the connector, for example a flange. In some embodiments the releasable engagement of the Venturi device with the connector will be an airtight seal such that substantially gas cannot escape from the mixing chamber around an engaged Venturi device. In some embodiments the exit port and or the second inlet port of the connector may have valves, for example silicone split, valves or oversized split valves or the like that substantially prevent gas passing through the exit port and or second inlet port when no Venturi device is engaged but also seal around any engaged Venturi device. Once releasably engaged the Venturi device would be connected to an oxygen source which may be via a conduit connected to the oxygen connecting portion of the Venturi device which will protrude from the connector via the second inlet port. Likewise in practice a nebuliser will be releasably engaged with the connector via the first inlet port. In some embodiments this may be via a clip, or clip mechanism where corresponding mating surfaces (so configured) of the connector around the second inlet port and the exit port of the nebuliser may be pushed together to releasably engage. In some embodiments there may be a friction-fit engaging mechanism and it is foreseen that in some of these friction-fit embodiments that the joining or pushing force overcomes structural resistant, of the connector or nebuliser or both, but that once the resistance force is overcome the nebuliser is securely, but releasably held. In some embodiment this will also be held or engaged in an airtight fashion that substantially gas is prevented from passing in or out of the mixing chamber around the nebuliser. Thus gas enters the mixing chamber of the connector via the nebuliser and or via the Venturi device, and in some embodiments maybe via air inlets of the connector. In practice the nebuliser will comprise, or be loaded with the medicament or substance to be nebulised, when the gas supply is running to the nebuliser, nebulised substances will enter the mixing chamber of the connector. When the oxygen supply is fitted and running to the Venturi device this will entrain (draw in) nebulised substances, and gas in the mixing chamber into the flow of the oxygen air mix of the Venturi device that then can exit vi the nebuliser and exit port of the connector, to a face mask or nasal tubing or the like to a user. Some embodiments of the connector may have one or more air inlets to allow air from outside of the connector to enter the mixing chamber of the connector. This air flow may enable a better or improved flow of gas and nebulised substance into the entrained mix of gas and nebulised substances. In some embodiments that comprise air inlets these may further comprise valves that may for example be one way valves to only allow gas and other substances into the mixing chamber. The air inlets may allow a better flow, to ensure enough air or gas is entrained into the running Venturi device when engaged with the connector. In some embodiments the first inlet port may also comprise a valve that when a nebuliser is not fitted the valve substantially prevents gas entering the mixing chamber. In embodiments with various valves at the exit port, the first inlet port and the second inlet port enable the connector to act as a nebuliser only, a Venturi device only or both a nebuliser and Venturi device. In some embodiments the connector comprises a heating mechanism. It is foreseen that the nebuliser and or Venturi device may be supplied with heated or temperature controlled gas, oxygen or breathing air and thus a separate heating mechanism for the connector may not be required. However in some embodiments the connector comprises a heating mechanism to warm the connector and or mixing chamber to reduce condensation on the inner wall surface of the connector and or mixing chamber of the connector. By the term “airtight” as used herein this is used to mean a fluid tight seal and is not limited to air alone but gas and liquids in general and substances that may act like gases, for example suspended particles suspended in a gas. Likewise the term “fluid tight” means to also include substances that may act like a gas for example suspended particles in a gas. By the term “air inlet” as used herein this may include in meaning the plural “air inlets” and an “air inlet” may comprise a plurality of air inlets. When referring to the size of the air inlet it will mean the total opening area, whether this is from one air inlet or a plurality of air inlets. By the term “engaged” as used herein this may include in meaning “when engaged”. By the term “pressure relief valve” or “pressure release valve” or “pressure relief valve” or “relief valve” and the like terms as used herein these terms are used interchangeably, equivalent in meaning, and include in meaning a valve that is biased closed in usual circumstances but that is opened or openable when subject to a pre-determined set pressure, for example to let fluid pass from a higher pressure area to a lower pressure area. By the term “valve” as used herein this term is used to mean a working valve that has at least a fully closed position that prevent the passage of fluids through the valve and an at least other configuration where the valve is opened or openable to enable the passage of fluids through the valve. By the term “Venturi device” or medical “Venturi device “ or “ oxygen Venturi device” and the like, as used herein these terms are used to mean a Venturi device designed to deliver a constant concentration of oxygen, able to entrain air or other fluids with an oxygen supply. A person skilled in the art will understand that the Venturi device is configured to deliver a constant concentration of oxygen but that this is not a precise concentration but exact enough for purpose. In the art these items are also known as “Venturi valves”, or at least the part with air vents is known as “Venturi valves” but for ease of describing herein the “Venturi device” is used to include in meaning the “Venturi valves”. The term also includes variable Venturi devices which may be selected to deliver different fixed or constant concentration rates of oxygen as required. Any one or more features described herein of any aspect, example or embodiment of the invention as described herein may be combined with any other one or more features of any other aspect, example or embodiment of the invention as described herein. Moreover, reference in the singular to feature, for example, any inlet, outlet, flow path, valve, flow conduit or other component, will be understood to may include the plural, and in particular plural flow paths in series or in parallel as dictated by the requirements of the function may be provided for any feature of the invention. Likewise, the plural term may include the singular. It should be understood that the terms first, second third etc and the like may be used herein to help describe various elements or features but need not necessarily be limited by these terms, these terms are used to distinguish one element or feature from another. For example, a first feature or element may be termed a second element or feature and similarly a second element or feature may be termed a first element or feature without departing from the scope of the embodiment described. The description, embodiments, examples and related figures herein describing the present invention are intended to illustrate various possible embodiments of the present invention and the said embodiment, examples and related figures are not intended to confine or limit the present invention to any specific embodiment or example as herein described but includes a plurality of variations and alternatives within the scope of the claims. The invention will be described by way of non-limiting numbered examples: 1. A connector for mixing two or more fluids, wherein the connector comprises a mixing chamber, wherein the mixing chamber comprises: - a first inlet port configured for engaging with a nebuliser and to receive fluid from a nebuliser into the mixing chamber; -a second inlet port configured for engaging with a Venturi device and to receive a fluid into the mixing chamber; and, -an exit port configured for engaging with a Venturi device, or a delivery face mask, or both a Venturi device and a fluid delivery face mask. 2. A connector as described in example 1 wherein the first inlet port is upstream of the second inlet port. 3. A connector as described in any one of examples 1 or 2 wherein the second inlet port and the exit port are axially aligned. 4. A connector as described in any one of examples 1, 2, or 3 wherein the second inlet port comprises a valve. 5. A connector as described in example 4 wherein the valve is a self-closing valve. 6. A connector as described in any one of examples 4 or 5 wherein the valve is configured to open on engagement with a Venturi device and configured to close on disengagement with a Venturi device. 7. A connector as described in any one of examples 4, 5, or 6 wherein the valve is configured to enable a portion of an engaged Venturi device to protrude out of the second inlet port. 8. A connector as described in any one of example 4 to 7 wherein the valve is configured to form a seal between the second inlet port and an engaged Venturi device. 9. A connector as described in any one of examples 4 to 8 wherein the valve is a silicone split valve. 10. A connector as described in any example 1 to 9 wherein the connector is configured to at least partially house a portion of an engaged Venturi device such that air vents of an engaged Venturi device are within the mixing chamber and that fluid from the mixing chamber is able to enter air vents of an engaged Venturi device. 11. A connector as described in any example 1 to 10 wherein the connector is configured to releasably hold an engaged Venturi device. 12. A connector as described in any example 1 to 11 claims wherein the connector is configured to releasably hold a nebuliser. 13. A connector as described in any example 1 to 12 wherein the exit port comprises an inner facing flange that is configured to abut against a portion of an engaged Venturi device. 14. A connector as described in any example 1 to 13 claim wherein the exit port comprises a connector mechanism to connect to a fluid delivery face mask or fluid delivery system. 15. A connector as described in example 14 wherein the connector mechanism comprises screw-threads that are configured to correspond to screw-threads of a Venturi device. 16. A connector as described in any example 1 to 15 wherein the mixing chamber comprises an air inlet; or comprises a pressure relief valve; or comprises an air inlet that comprises a pressure relief valve. 17. A connector as described in example 16 wherein the pressure relief valve is a one way valve configured to only let fluid in when the pressure relief valve is subject to a pre-set pressure difference across the pressure relief valve. 18. A connector as described in any one of examples 16 or 17 wherein the pressure relief valve comprises an umbrella valve or a flap valve. 19. A connector as described in any one of examples 16, 17 or 18 wherein the pressure relief valve is downstream of the first inlet valve; or wherein the pressure relief valve is downstream of the first inlet port; or wherein the pressure relief valve is upstream of the first inlet port. 20. A connector as described in any example 1 to 19 wherein the first inlet port is positioned at the lower surface of the connector, when orientated for use. 21. A connector as described in any example 1 to 20 wherein the exit port is configured to at least partially house a portion of an engaged Venturi device. 22. A connector as described in any example 1 to 21 wherein the first inlet port is configured to releasably engage to standard sized nebulisers. 23. A connector as described in any example 1 to 22 wherein the second inlet port and exit port are configured to releasably engage with standard sized fixed rate oxygen supply medical Venturi devices. 24. A mask for delivering oxygen, air and another fluid, wherein the mask is configured for application to a user to supply fluid to a user and to cover the nose and mouth of a user; the mask comprises: a connector as described in any one of examples 1 to 23. 25. A fluid delivery system for delivering oxygen, air and another fluid, wherein the fluid delivery system configured for application to a user to supply fluid to a user, the fluid delivery system comprises: a connector as described in any one of examples 1 to 23. 26. A system for mixing fluids for delivery to a user comprising a connector as described in examples 1 to 23 or a mask as described in example 24, or a fluid delivery system as described in example 25 further comprising a nebuliser and a Venturi device with an oxygen supply source. Detailed description The invention will now be described by non-limiting examples with reference to the attached figures. Figures 1a and 1b show a partial side views of an upper portion of an example connector of the present invention; Figures 2a and 2b show partial cut away views of the example of connector shown in Figures 1a and 1b; Figures 3a and 3b show further partial cut away views of the example of connector shown in Figures 1a and 1b and Figures 2a and 2b but with an engaged Venturi device; Figure 4a and 4b show examples of valves suitable for use with the present invention. Figure 5 shows a cross sectional view of a facemask. Figure 6 shows 6 prior art Venturi devices suitable for use with the present invention. Figure 7a and 7b shows connectors of the present invention with Venturi devices and nebulisers. Figure 8 shows a cut away cross section view of an embodiment of a connector of the present invention. Figure 9 also shows a cut away cross section view of an embodiment of a connector of the present invention with an engaged Venturi device also in cut away cross sectional view. Figure 10 is a cut away exploded view an embodiment of the connector with an engaged Venturi device. Figure 11 is a cut away cross sectional view of an embodiment of the connector. Figure 1a and 1b show partial side views of an upper portion of an example connector 1 of the present invention. Figure 1a shows a pressure relief valve 3. In this example the pressure relief valve 3 comprises an umbrella valve. Also shown is an exit port 4 with an engaged Venturi device 5 sitting in the exit port 4. Figure 1 b shows the opposite side view of the connector 1, to that shown in Figure 1a and shows the second inlet port 6 with a valve 7, in this example the valve 7 is a silicone split vale and also shown is a protruding portion 8 of an engaged Venturi device 5. In the example the connector 1 comprises plastic. Figure 2a and 2b show partially cut away views of the example of connector 1 described in Figures 1a and 1b, but without a Venturi device 5 . Also shown is the open exit port 4 with inner walls 9 forming a channel 10. The inner walls 9 of the exit port 4 comprise an inner facing flange 11, wherein the diameter of the channel 10 across the flange 11 is smaller in diameter than the diameter of the channel 10 at the outer portion of the exit port 4. An engaged Venturi device may abut against the flange 11 when engaged with the exit port. The Figure 2a figure shows that the second inlet port 6 is axially aligned with the exit port 4 to aid easy engagement of a Venturi device. The mixing chamber 12 is also shown. Figure 2b shows a different cut away view to Figure 2a but also shows the mixing chamber 12, the exit port 4, side walls 9 of the exit port 4, forming the channel 10 and with the flange 11. Also shown is the second inlet port 6 with valve 3 shown fitted, and the pressure relief valve 3. Figure 3a and 3b show partially cut away views of the connector 1 shown in figures 1a, 1b 2a and 2b but with a Venturi device 5 in engagement with the connector 1. Figure 3a shows the open vents 13 of an engaged Venturi device 5, 8 where the vents are open and in fluid communication with the mixing chamber 12. Also shown is a pressure relief valve 3 the protruding portion 8 of a Venturi device 5 with inlet 15 for oxygen. The engaged Venturi device 5 can be see abutted against the flange 11 inside the channel 10 of the exit port 4. The engaging of the Venturi device 5 forms a fluid seal between the Venturi device 5 and the inner walls 9 and or flange 11, preventing fluids entering or exiting the mixing chamber 12 between the Venturi device 5 and the inner walls 9 and or flange 11 of the exit port 4. In addition Figure 3b shows and engaged nebuliser 14 engaged with the fist inlet port 2. Figures 4a and 4b show valves, Figure 4a shows a pressure relief valve and in particular an Umbrella valve while Figure 4b shows a split valve and in particular a silicone split valve. Figure 5 shows a partial cross sectional delivery facemask 100 embodiment of the present invention on a user 200. Shown is a Venturi device 5, nebuliser 14 and mixing chamber 12. The protruding portion 8 of the Venturi device 5 is attached via a conduit 300 to an oxygen source, (not shown). Figure 6 shows some examples of current Venturi device that are suitable for use with the present invention. The Venturi devices shown in Figure 6 are not foreseen to be the only Venturi devices capable to be used with the present invention. The Venturi devices shown in Figure 6 are to assist in the understanding of the present invention. A person skilled in the art will recognise these to be “standard” Venturi devices in the sense that the attachments portions are of a “standard” size to be able to easily fit other “standard” sized equipment for example conduits and oxygen sources, although the present invention need not necessarily be limited to “standard” sizes only. These Venturi devices are from a product range from Intersurgical Inc. however is different embodiments other Venturi devices may be used. Figure 6 shows starting from the bottom a blue B, white W, orange O, yellow Y, red R, and green G, Venturi devices, each having different air vent sizing that when given a recommended oxygen flow rate deliver a fixed rate of oxygen. In practice when in use, the recommended oxygen flow rate enables oxygen to enter the oxygen connecting portion 8 (which in other drawings is referred to as the protruding portion 8 of the Venturi device, then air or gas is entrained through the air I open vents 13 to exit at the opposite end of the Venturi device to the oxygen source connecting portion 8 or “protruding end” 8. Often the Venturi devices are marked 16 with the recommended oxygen flow rate and subsequent fixed oxygen amount. It can be that the Venturi device will give a different fixed rate oxygen delivery when a different recommended flow rate of oxygen is applied. Figure 7a and 7b shows example connectors 1 of the present invention with Venturi devices 5 and nebulisers 14. Figure 7a has a white W Venturi device 5 almost completely engaged into the connector 1. This particular Venturi device is manufacture and supplied from Intersurgical Inc. The protruding portion 8 or oxygen connecting portion 8 is just visible in the figure 7a. In other embodiments other types of Venturi devices may be used and the invention is not intended necessarily to be limited to particular Venturi devices. In this embodiment there is shown three air inlets 18, which will allow air to flow to the mixing chamber 12. These may, but not necessarily, be fitted with valves of various types, to for example, allow air flow only one way, for example into the mixing chamber from outside of the connector. In practice the Venturi device is not initially connected to the oxygen source via the oxygen connection portion 8, but is placed in the connector first via the exit port 4 of the connector with the oxygen connecting portion 8 (of the Venturi device 5) first. The Venturi device 5 is placed through the exit port 4 (of the connector) until the oxygen connecting portion 8 protrudes through the second inlet port 6 (of the connector 1) and protrudes through the connector 1 and abuts on inner walls of the connector 1 such that the connector 1 can hold the Venturi device. In some embodiments this inner wall of the connector that abuts an engaged Venturi device may comprise a flange, or comprise one or more flanges that are configured to abut against an engaged or engaging Venturi device. Also in this embodiment of Figure 7a can be seen is nebuliser 14 that is engaged with the connector 1. In this embodiment the nebuliser is engaged with the connector by a friction-fit engaging mechanism. In this embodiment the connector comprises plastic. In this embodiment the connector is manufactured of plastic which give the structure strength and rigidity. In this embodiment the engaging mechanism is a friction-fit type that a nebuliser 14 can be engaged to the connector 1 by a push action that overcomes a certain amount of frictional force but once push passed this resistance, releasably holds the nebuliser firmly engaged with the connector. To release the nebuliser from the connector may happen by a pull or separating force, by a user, to separate an engaged nebuliser from the connector. Again in practice with this embodiment, the pull or separating force may overcome some resistance force before separating but both the connector and nebuliser would be configured and manufacture to be strong enough to maybe flex in shape enough to allow the engaging and disengaging of the two parts without breaking and both would be useable in theory. Such engaging mechanisms are known in practice. Other embodiments may have different engaging mechanisms. In this embodiment a Cirrus II (trade mark of Intersurgical Inc) nebuliser was used for engaging to the connector 1 but other embodiments may be used with other nebulisers. Figure 7b shows a Red R Venturi device 5 engaged with a connector 1 of the present invention as can be seen the oxygen source connecting portion 8 protrudes through the second inlet port 6 of the connector 1. This embodiment of the connector 1 also has air inlet 18. In this embodiment there is shown three air inlets 18. Again the air inlets may be fitted with valves, but not necessarily. Different embodiments, that have air inlets may have a different number, and size of air inlets. In this embodiment a nebuliser from Clement Clark International was used for engaging to the connector 1 but other embodiments may be used with other nebulisers. Figure 8 shows a cut away cross section view of an embodiment of a connector 1 of the present invention. As can be see there are three air inlets 18, which may allow air into the mixing chamber and which may, but not necessarily, be fitted with valves (not shown), that may enable air to flow into the mixing chamber 12 only not out, but other valves may function differently if fitted. Also show is the exit port 4 that in this embodiment comprises two flanges 11 to help seat and hold an engaging Venturi device 5, that in practice would be inserted into the exit port 4 until seated on the two flanges 11 and the oxygen connection portion 8 of the engaging Venturi device 5, protrudes the second inlet port 6 and a portion of the Venturi device 5 abuts on the inner wall 9 of the connector 1 at portion 20. As can be seen in Figure 8, in this embodiment the second inlet port and the exit port are axially aligned and configured such that the second inlet port and exit port may releasably engage different portions of an engaged Venturi device. It is foreseen that the connector would be configured, sized and shaped to enable such engagement with a Venturi device 5. Also seen is a partial view of an engaged Nebuliser 14. The Nebuliser 14 in this embodiment is engaged by a friction—fit mechanism 21. In practice the Nebuliser 14 to be engaged with the connector 1 with such a friction-fit mechanism 21 could be push towards the connector with the corresponding matching fittings or mechanism in contact until the friction resistance is outcome and the nebuliser 14 is securely but releasably engaged with the connector 1. To remove the nebuliser 14 a pull action strong enough to overcome the frictional resistance will release the nebuliser 14 from the connector 1.Other embodiments may have different connecting means to engage the Venturi device 5 or nebuliser 14. For completeness the out surface 19 of the connector 1 is shown. As shown in figure 8 the inner wall surface 9 has a sloping or angled portion near the second inlet port that nebulised substance that condenses on the inner wall surface 9 of the mixing chamber 12 and or connector 1 may flow back into the engaged nebuliser 14. As shown in the friction-fit mechanism 21 of engaging the engaged nebuliser 14 to the connector 1, the connector comprises the male or smaller diameter clip corresponding mating clip mechanism 21 and the nebuliser comprises the female or larger corresponding mating mechanism 21 configure such that condensed nebulised substances from the mixing chamber 12 may flow into the engaged nebuliser 14. Other embodiments may have different engaging means and mechanisms. Figure 9 is similar to Figure 8 but in addition shows an engaged Venturi device 5. As can be seen the engaged Venturi device 5 (engaged with the connector 1) abuts the flanges 11 and on the inner wall surface 9 of the connector 1. As can be seen in Figure 9, in this embodiment the second inlet port and the exit port are axially aligned and configured such that the second inlet port and exit port may releasably engage different portions of an engaged Venturi device. As can be seen the Venturi device has airvents 55 that are open and unobscured within the mixing chamber 12, such that gas, air, suspended particles, nebulised substances and the like, within the mixing chamber 12 are free to enter the air vents 55 of the engaged Venturi device 5. In practice when a gas supply is supplied to an engaged nebuliser 14 engaged to the connector 1, and an oxygen or breathing gas supplied to the oxygen supply connecting portion 8 of an engaged Venturi device 5, nebulised substances will be in the mixing chamber and can be entrained by the flow of oxygen gas mix from the oxygen supply into the engaged Venturi device 5 via the air vents 55 of the engaged Venturi device 5 and exit through the Venturi device 5 and the exit port 4, in a gas oxygen nebulised substance mix. The air inlets 18 may allow a better flow, to ensure enough air or gas is entrained into the running Venturi device 5 when engaged with the connector 1. Figure 10 is a cut away exploded view an embodiment of the connector 1 with an engaged Venturi device 5. As can be seen in Figure 10, in this embodiment the second inlet port and the exit port are axially aligned and configured such that the second inlet port and exit port may releasably engage different portions of an engaged Venturi device. As can be seen the oxygen source connecting portion 8 of the engaged Venturi device protrudes from the connector 1, and can be fitted to a conduit or the like to connect to an oxygen or breathing air mix supply source. As can be seen the air vents 55 are open within the mixing chamber (not blocked) such that gas, air nebulised substance and the like within the mixing chamber 12 can flow into the engaged Venturi device. In this embodiments at least one portion of the engaged Venturi device 5 abuts a portion of the connector 1 when releasably engaged with the connector 1. Also shown in this embodiment are air inlets 18, that may assist flow of gas, air nebulised substances and the like into the engaged Venturi device 5, and thus exit the connector 1 and Venturi device 5 to a user via a facemask or nasal tubes or the like. Advantageously the connector of the present invention may enable a good flow of the nebulised substance into the oxygen air mix for a user. Figure 11 is a cut away cross sectional view of an embodiment of the connector 1. In this embodiment when in use and a Venturi device 5 is engaged by the exit port 4 and second inlet port 6 of the connector 1, the longitudinal axis of the Venturi device 5 or the longitudinal aligned axis of the exit port 4 and second inlet port 6 is at an angle A, about 35 degrees, to the horizontal plane H. This angled orientation of the Venturi device 5 enables a good flow of any nebulised substances from the nebuliser 14 (when engaged) to be entrained into the oxygen or breathe air supply of the Venturi device 5. Additionally this angled orientation with angled lower inner wall of the connector 1 may enable any nebulised substance that condenses on the inner wall of the connector 1 or mixing chamber 12 of the connector 1, to flow back into an engaged nebuliser 14. Additionally the connector comprises a friction-fit engagement mechanism wherein the male, or smaller, or inner mating corresponding portion, to mate with a corresponding larger or outer or female portion on a nebuliser when a corresponding nebuliser is engaged. This engagement configuration also assists in returning condensed nebulised substances to an engaged nebuliser.

Claims

1. A connector for mixing two or more fluids, wherein the connector comprises a mixing chamber, wherein the mixing chamber comprises:- a first inlet port configured for engaging with a nebuliser and to receive fluid from a nebuliser into the mixing chamber;-a second inlet port configured for engaging with a Venturi device and to receive a fluid; and,-an exit port configured for engaging with a Venturi device:wherein the second inlet port and the exit port are axially aligned and configured such that the second inlet port and the exit port are each configured to at least partially surround at least a portion of a Venturi device when a Venturi device is engaged with both the second inlet port and the exit port, such that air vents of an engaged Venturi device are within the mixing chamber and that fluid from the mixing chamber is able to enter air vents of an engaged Venturi device.

2. A connector as claimed in claim 1 wherein the first inlet port is upstream of the second inlet port.

3. A connector as claimed in any one of claims 1 or 2 wherein the second inlet port comprises a valve; or the first inlet port comprises a valve; or the exit port comprises a valve; or any combination of the exit port, first inlet port or the second inlet port comprises a valve.

4. A connector as claimed in claim 3 wherein the valve is a self-closing valve.

5. A connector as claimed in any one of claims 3 or 4 wherein the valve is configured to open on engagement with a Venturi device and configured to close on disengagement with a Venturi device.

6. A connector as claimed in any one of claims 3, 4, or 5 wherein the valve is configured to enable a portion of an engaged Venturi device to protrude out of the second inlet port.

7. A connector as claimed in any one of claims 3 to 6 wherein the valve is configured to form an airtight seal between the second inlet port and an engaged Venturi device.

8. A connector as claimed in any one of claims 3 to 7 wherein the valve is a silicone split valve.

9. A connector as claimed in any preceding claims wherein the connector is configured to releasably hold an engaged nebuliser.

10. A connector as claimed in any preceding claim wherein the exit port comprises an inner facing flange that is configured to abut against a portion of an engaged Venturi device.

11. A connector as claimed in any preceding claim wherein the exit port comprises a connector mechanism to connect to a fluid delivery face mask, or nasal tubing or a fluid delivery system.

12. A connector as claimed in any preceding claim, wherein the exit port of the connector comprises screw-threads that are configured to correspond to screw-threads of a Venturi device; or wherein the exit port of the connector comprises a friction fit mechanism configured to correspond to at least one mating surface of a Venturi device.

13. A connectors as claimed in any preceding claims wherein the mixing chamber comprises an air inlet; or comprises a pressure relief valve, or comprises an air inlet that comprises a pressure relief valve.

14. A connector as claimed in claim 13 wherein the pressure relief valve is a one way valve configured to only let fluid in when the pressure relief valve is subject to a pre-set pressure difference across the pressure relief valve.

15. A connector as claimed in any one of claims 13 or 14 wherein the pressure relief valve comprises an umbrella valve, or a flap valve, or a hinge valve, or a split valve or a silicone split valve.

16. A connector as claimed in any one of claims 13, 14 or 15 wherein the pressure relief valve is downstream of the first inlet port valve; or wherein the pressure relief valve is downstream of the first inlet port; or wherein the pressure relief valve is upstream of the first inlet port.

17. A connector as claimed in any preceding claim wherein the first inlet port is positioned at the lower surface of the connector, when orientated for use; or wherein the exit port is positioned protruding from the upper surface of the connector; or the inlet port is positioned at the lower surface of the connector and the exit port protrudes from an upper surface of the connector, when orientated for use.

18. A connector as claimed in any preceding claim wherein the exit port and second inlet port is configured to releasably engage a Venturi device such that at least one or all of the air vents of the Venturi device are open.

19. A connector as claimed in any preceding claim wherein the exit port and the second inlet port are configured to releasably engage a Venturi device such that at least one or all of the air vents of the Venturi device is distanced or spaced away from the inner wall surface of the connector.

20. A connector for mixing two or more fluids, wherein the connector comprises a mixing chamber, wherein the mixing chamber comprises:- a first inlet port configured for engaging with a nebuliser and to receive fluid from a nebuliser into the mixing chamber;-a second inlet port configured for engaging with a Venturi device and to receive a fluid; and,-an exit port configured for engaging with a Venturi device:wherein the second inlet port and the exit port are axially aligned and configured such that the second inlet port and exit port may releasably engage different portions of an engaged Venturi device; and,the connector comprises one or more air inlets configured that when open the air inlet may enable air to enter the mixing chamber.

21. A connector as claimed in either claim 13 or 20, wherein;a / the total open area of an air inlet or air inlets is between 0.3 and 15 percent of the total outer surface area of the connecter; or,b / the total open area of the air inlet, or air inlets is between 30 millimetres square and 1500 millimetres square; or,c / the total open area of an air inlet or air inlets is between 0.3 and 15 percent of the total outer surface area of the connecter and the total open area of the air inlet, or air inlets is between 30 millimetres square and 1500 millimetres square.

22. A connector as claimed in any preceding claim wherein the first inlet port comprises a clip or clip engagement mechanism, or friction-fit engagement mechanism, or part of, that mates with corresponding surfaces of a nebuliser to releasably engage a nebuliser with the connector.

23. A connector as claimed in any claim 22 wherein the connector engagement mechanism comprises smaller or inner or male mating component of the clip or clip, or friction-fit engagement mechanism configured to make and releasably engage with the larger or outer or female mating component of the engagement mechanism on a nebuliser.

24. A mask for delivering oxygen, air and another fluid, wherein the mask is configured for application to a user to supply fluid to a user and to cover the nose and mouth of a user; the mask comprises:a connector as claimed in any one of claims 1 to 23.

25. A system for mixing fluids for delivery to a user comprising a connector as claimed in claims 1 to 23 or a mask as claimed in claim 24, further comprising a nebuliser and a Venturi device with an oxygen supply source.51

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