Wearable biophysiological acquisition device and an accessory for wearable biophysiological acquisition device
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2026-02-10
- Publication Date
- 2026-08-13
Smart Images
Figure IB2026051267_13082026_PF_FP_ABST
Abstract
Description
[0001] WEARABLE BIOPHYSIOLOGICAL ACQUISITION DEVICE AND AN ACCESSORY FOR WEARABLE BIOPHYSIOLOGICAL ACQUISITION DEVICE
[0002] Field
[0003] The present disclosure relates to an accessory for a wearable biophysiological acquisition device, such as an electroencephalogram (EEG) headset, a wearable biophysiological acquisition device, and a kit of parts for a wearable biophysiological device comprising the accessory.
[0004] Background
[0005] Biophysiological signals are generated by a person’s body as a result of electrical, mechanical or chemical processes occurring within the body. One particular category of biophysiological signals are electroencephalographic (EEG) signals. Such signals include the signals for measuring heart rate, blood oxygenation, body temperature, and electrodermal response. These signals can be used to determine mental states (cognitive processes and emotional states) of the user.
[0006] EEG devices are useful in recording the EEG signals from the brain. Wearable EEG devices, such as wearable EEG headsets position non-invasive electrodes along the scalp of the user.
[0007] The position of these non-invasive electrodes is important. In order to acquire EEG signal from the key areas of the brain involved in sensory, motor and attention processing, the electrodes must be positioned on the middle of the head. Currently, there are several methods of using electrodes to acquire the EEG signal from the middle of the user’s head.
[0008] The first method relies on sponge electrodes. In order for sponge electrodes to provide sufficient contact through the hair of a user, they must be wet, for example using an electrolyte solution or saline solution. Dry sponge electrodes firstly in the absence of any electrolyte solution or saline solution are not conductive, and secondly do not penetrate through the hair of the user. Therefore, dry sponge electrodes are considered unsuitable for obtaining EEG signals from the middle of the head of the user. Textile electrodes are known to have a similar issue. Wetting the sponges presently involvesimmersing the sponges in saline or electrolyte solution prior to use. The sponge electrodes can subsequently be used for a duration of between 1 to 2 hours. After this duration, the sponges dry out, and the EEG device ceases to function properly. The sponges must then be removed from the device and immersed in saline or electrolyte solution before they can be reinserted into device such that the device can again be used.
[0009] An alternative method uses conductive gels. The conductive gels may act as a bridge between the electrode and head of the user. The electrodes can therefore measure EEG signals from the head of the user through the conductive gel. Whilst such gels may enable the EEG device to function for several days, the duration of use of the device is proportional to the difficulty of removal of the gel from the hair of the user. As such, use of gels necessitates washing or equivalent removal of the gel from the hair of the user. Therefore, gel electrodes are not considered suitable in regular everyday applications.
[0010] An alternative method is the use of dry electrodes, such as comb electrodes. Comb electrodes comprise a plurality of protrusions that engage with the scalp of the user. The use of comb electrodes in wearable EEG devices can be uncomfortable to the user over prolonged periods of time. This is exacerbated as additional pressure must be applied to the device to ensure effective contact of the projections with the user’s scalp to account for the otherwise low signal quality.
[0011] The existing methods often require fitment of the EEG device by trained technicians. Such fitment is difficult for the user to carry out themselves and thus requires the arrangement of appointments to have the EEG device fitted. This involves significant time, travel, and a dependency on the technicians’ availability.
[0012] Therefore, there are shortcomings associated with each existing method and apparatus of acquiring EEG signals from the middle of the user’s head.
[0013] Summary
[0014] It has been identified that there is a requirement to provide a wearable EEG device that is both easy to use and which provides a sufficiently good signal from the middle of the user’s head for a prolonged period of time. It would be additionally advantageous for the provision of a device which is comfortable for the user. It would be additionallyadvantageous for the provision of a device which can be fitted by the user themselves without requiring fitment by a trained technician.
[0015] As such, there is provided a wearable biophysiological acquisition device according to a first aspect. The wearable biophysiological acquisition device comprises a headset comprising a headband coupled to a left headphone at a first end of the headband and coupled to a right headphone at a second end of the headband;
[0016] a reservoir coupled to the headset and comprising one or more chambers configured to hold a fluid;
[0017] one or more electrodes fluidically connected to the reservoir; and
[0018] one or more electrical contacts coupled to the reservoir;
[0019] wherein the one or more electrical contacts provide electrical connection between the device and the one or more electrodes.
[0020] There is provided an accessory for a wearable biophysiological acquisition device according to a second aspect. The accessory for use with a wearable biophysiological acquisition device comprises:
[0021] a reservoir comprising one or more chambers configured to hold a fluid; one or more electrodes fluidically connected to the reservoir; and
[0022] one or more electrical contacts configured to, in use, provide electrical connection between the device and the electrode.
[0023] To prevent the possibility of short circuiting, where the reservoir comprises a single chamber or multiple chambers fluidically coupled to each other, the device may comprise one electrode and one electrode contact.
[0024] To prevent the possibility of short circuiting, where the reservoir comprises multiple chambers that are not fluidically coupled to each other, the device may comprise one electrode and one electrode contact per chamber.
[0025] There is provided a kit of parts for a wearable biophysiological acquisition device according to a third aspect. The kit of parts comprises a headband; a left headphone; a right headphone; and an accessory according to the second aspect.The kit of parts may further comprise a charger. The charger may comprise a stand or case through which liquid is soaked or conveyed directly or indirectly into the interior or exterior of the wearable biophysiological acquisition device. The stand or case may additionally be a battery recharging station to charge the device, such as electronically recharging the electrodes.
[0026] There is provided a method for coupling an accessory to a headset of the wearable biophysiological acquisition device according to a fourth aspect. The method comprises:
[0027] (a) providing an accessory according to the second aspect;
[0028] (b) providing a headset comprising a headband coupled to a left headphone at a first end of the headband and coupled to a right headphone at a second end of the headband;
[0029] (c) securely coupling the accessory to the headband of the headset.
[0030] The accessory of the invention slowly wets the electrodes during use, enabling them to remain wet for a prolonged period of time. This advantageously has the effect of reducing the requirement for immersing the sponges in saline or electrolyte solution prior to use. Further advantageously, this extends the period of time the device can be used for. This increases the ease at which the user can utilise the device over existing devices, as the user only has to attach the accessory to the device before enjoying prolonged periods of uninterrupted use.
[0031] Upon exhausting the fluid levels within the reservoir, the accessory may then be recharged with fluid. The accessory may be removed from the device prior to recharging and reattaching the accessory to the device. Alternatively, the accessory may be removed, discarded and a new accessory attached to the device. The recharging and / or reattachment or discarding of the accessory and reattachment of a new accessory advantageously would occur on a less frequent basis in comparison to the removal and immersion of the electrodes used in existing devices, thereby improving ease of usability of the device of the invention in comparison to existing devices.
[0032] Additionally, when the accessory of the second aspect is used in the device of the first aspect, the device will feel considerably more comfortable than existing wearable EEG devices utilising comb electrodes. Comb electrodes require effective contact of the projections with the user’s scalp, which is often uncomfortable for the user. Theinvention avoids the use of comb electrodes as the dampness of the electrode ensures accurate signal acquisition.
[0033] The accessory of the second aspect may be used in the wearable device of the first aspect, and may be provided in the kit of the third aspect.
[0034] In the wearable biophysiological acquisition device, the electrodes may be fluidically connected to the reservoir such that in use, one or more electrodes may contact the head of the user. The electrodes may be in contact with the middle of the head of the user (or at least substantially centrally on the head). For example, the one or more electrodes may be coupled directly or indirectly to the headband for such positioning.
[0035] In the wearable biophysiological acquisition device, the one or more electrodes may be indirectly fluidically connected to the reservoir. The indirect fluidic communication enables the electrodes to be effectively wet such that they may perform their function without short-circuiting the invention.
[0036] In the wearable biophysiological acquisition device, the reservoir may be one or more chambers defined within the headset of the wearable biophysiological acquisition device. As such, the headset itself may define the chambers such that an additional accessory, such as the accessory of the second aspect, may not be required, as the chambers are integral to the device. The chambers may be designed to hold, retain, and distribute fluid.
[0037] The reservoir may be two or more chambers, such as two to twenty chambers, two to fifteen chambers, or two to ten chambers. The one or more chambers may collectively form the reservoir. They may be designed to hold, retain, and distribute fluid.
[0038] Where there are a plurality of chambers, these may be divided partially or fully into internal or external segments. Where the chambers are divided fully into internal or external segments, each chamber may be fluidly connected to one electrode and electrode contact. The chambers hold fluid to ensure there is a fluid connection between the one or more electrodes and reservoir.The one or more chambers may comprise a hygroscopic material. The hydroscopic material may have a high water absorption capacity. The hygroscopic material may be capable of retaining and releasing water or other liquid over an extended period. Examples of such materials include sponge, foam, gel, porous ceramic, mineral sand, and the like. The hygroscopic material may be capable of holding fluid to ensure there is a fluid connection between the one or more electrodes and reservoir.
[0039] The reservoir may have:
[0040] • a filled configuration in which the reservoir receives a first amount of fluid; and • a depleted configuration in which the reservoir receives a second amount of fluid which is less than the first amount,
[0041] wherein in use, fluid flow from the reservoir to the one or more electrodes reduces the amount of fluid in the reservoir such that the reservoir is altered from a filled configuration to a depleted configuration.
[0042] This ensures the reservoir comprises fluid to enable fluid connection between the one or more electrodes and reservoir.
[0043] The filled and depleted configurations may be referred to as ‘states’ (i.e. a filled state and depleted state of the reservoir).
[0044] The reservoir may be configured to receive a first amount of fluid, and provide said fluid to the one or more electrodes through the fluidic connection. This enables to electrodes to remain wet such that the device may be used for prolonged periods of time.
[0045] The accessory may comprise one or more chambers. The accessory may comprise two or more chambers, such as two to twenty chambers, two to fifteen chambers, or two to ten chambers. The one or more chambers may collectively form the reservoir. They may be designed to hold, retain, and distribute fluid.
[0046] Where there are a plurality of chambers, these may be divided partially or fully into internal or external segments. Each chamber may be fluidly connected to one or more electrodes. The chambers hold fluid to ensure there is a fluid connection between the one or more electrodes and reservoir.The one or more chambers may comprise a hygroscopic material. The hygroscopic material may have a high water absorption capacity. The hygroscopic material may be capable of retaining and releasing water or other liquid over an extended period. Examples of such materials include sponge, foam, gel, porous ceramic, mineral sand, and the like. The hygroscopic material may be capable of holding fluid to ensure there is a fluid connection between the one or more electrodes and reservoir.
[0047] The accessory may be disposable. The accessory may be supplied in a filled configuration. The accessory may then be coupled to the wearable biophysiological acquisition device such that fluid flow from the reservoir to the one or more electrodes reduces the amount of fluid in the reservoir. The reservoir may be altered from a filled configuration to a depleted configuration. Once in the depleted configuration, the accessory may be decoupled from the wearable biophysiological acquisition device and discarded. A new accessory in a filled configuration may then be coupled to the wearable biophysiological acquisition device for further use.
[0048] The accessory may be reusable. The accessory may be supplied in a filled configuration. The accessory may then be coupled to the wearable biophysiological acquisition device such that fluid flow from the reservoir to the one or more electrodes reduces the amount of fluid in the reservoir. The reservoir may be altered from a filled configuration to a depleted configuration. Once in the depleted configuration, the accessory may be decoupled from the wearable biophysiological acquisition device. The accessory may then be recharged with fluid such that the accessory once again adopts the filled configuration. The accessory may then be coupled to the wearable biophysiological acquisition device for further use. Where the accessory is reusable, this has associated environmental advantages.
[0049] Where the accessory is disposable or reusable, the skilled person would appreciate that decoupling the accessory from the wearable device and subsequent coupling of another accessory is significantly easier than removal of individual electrodes and subsequent reattachment one at a time, as is required in existing devices. As such, the wearable device demonstrates greater usability than existing devices.
[0050] The accessory may comprise fluid refilling means through which fluid can be received by the reservoir. The fluid refilling means may enable the reservoir to be actuatablefrom a depleted configuration to a filled configuration. Examples of fluid refilling means may include an aperture, such as an aperture that is sealable in use, one-way seals, lids, lockable caps and the like. The skilled person would be aware of such fluid refilling means. This enables the accessory to be reusable.
[0051] The accessory may be couplable to a headset of a wearable biophysiological acquisition device at an upper or lower edge of the accessory. In one example, the accessory may be couplable to the headset of a wearable biophysiological acquisition device at an upper or lower face of the accessory. It may be possible for the accessory to be couplable to the headset of a wearable biophysiological acquisition device at one or more side walls of the accessory. This enables the accessory to be attached to or decoupled from the headset such that the advantages associated with the invention can be obtained.
[0052] The upper or lower edge of the accessory may be removably couplable to the headset of the wearable biophysiological acquisition device. In one example, the upper or lower face of the accessory may be removably couplable to the headset of the wearable biophysiological acquisition device. This enables the accessory to be securely coupled to a headset of a wearable biophysiological acquisition device when in use and detached from a headset of wearable biophysiological acquisition device when not in use. For example, the accessory may be replaced once fluid levels in the reservoir have been exhausted.
[0053] The upper or lower edge of the accessory may be couplable to the headband of a headset of a wearable biological acquisition device. In one example, the upper or lower face of the accessory may be couplable to the headband of a headset of a wearable biological acquisition device. The upper or lower edge of the accessory is preferably removably couplable to the headband of a headset. The upper or lower face of the accessory is preferably removably couplable to the headband of a headset. In use, this enables the one or more electrodes to contact the head of the user. This is particularly useful for contacting the middle of the head of the user.
[0054] The upper or lower edge of the accessory may be couplable to a central portion of the headband. In one example, the upper or lower face of the accessory may be couplable to a central portion of the headband. The upper or lower edge of the accessory may be preferably removably, or detachably, couplable to the central portion of the headband.The upper or lower face of the accessory may be preferably removably, or detachably, couplable to the central portion of the headband. The central portion of the headband in use may sit above the top of the user’s head. In use, this enables the one or more electrodes to contact the head of the user, and they may sit substantially centrally on the head of the user.
[0055] The upper or lower edge of the accessory may comprise a headset engaging formation configured to interact with an accessory engaging formation on a headset of a wearable biophysiological acquisition device such that, in use, the accessory is securely coupled to a headset of a wearable biophysiological acquisition device.
[0056] The upper or lower face of the accessory may comprise a headset engaging formation configured to interact with an accessory engaging formation on a headset of a wearable biophysiological acquisition device such that, in use, the accessory is securely coupled to a headset of a wearable biophysiological acquisition device.
[0057] The accessory engaging formation may be on the headband of the headset, such as an upper or lower face of the headband. These engaging formations enable the accessory to be securely coupled to the wearable biophysiological acquisition device when in use, and enable the accessory to be detached from the wearable biophysiological acquisition device when not in use.
[0058] The headset engaging formation and accessory engaging formations may be complementary. As such, in use, the headset engaging formation engages with the complementary second formation to securely couple the accessory to a headset of a wearable biophysiological acquisition device.
[0059] The headset engaging formation and accessory engaging formation may be interengaging clips.
[0060] The first and second formations may be fastening means that are actuatable between a locked configuration and an unlocked configuration. The locked configuration may be where the accessory is securely coupled to a headset of a wearable biophysiological acquisition device. The unlocked configuration may be where the accessory is detachable from the headset of a wearable biophysiological acquisition device. Theseconfigurations enable the accessory to be securely coupled to the headset when in use, but removable when not in use.
[0061] Fastening means to couple the accessory to the wearable biological acquisition device would be apparent to the skilled person. Examples of fastening means include clips, magnets, Velcro®, press studs, screws, nuts, bolts, and the like.
[0062] The skilled person would additionally be aware of how the fastening means are actuated from a locked configuration to an unlocked configuration and vice versa. For example, where the fastening means is a press stud, the headset engaging formation may be a stud, and the second formation may be a recess. Alternatively, the headset engaging formation may be a recess, and the second formation may be a stud. Actuation from the unlocked to the locked configuration requires the stud to be urged into the recess, and actuation from the locked configuration to the unlocked configuration requires the stud to be removed from the recess.
[0063] The accessory may comprise a conduit in fluidic communication with the reservoir and a fluid supply tank. The fluid supply tank may be external to the accessory. The fluid supply tank may be integral to a wearable biophysiological acquisition device the accessory may form a part of. The fluid supply tank may be stored within the headband of the wearable biophysiological acquisition device. The fluid supply tank may be stored within the left headphone and / or right headphone of the wearable biophysiological acquisition device. The conduit enables fluid flow from the fluid supply tank to the reservoir such that the device functions.
[0064] Where a fluid supply tank is used, it may not be necessary to remove the accessory from the wearable biological acquisition device once the fluid supply is exhausted. Instead, the fluid supply tank may be recharged with fluid. Alternatively, the fluid supply tank may be removed, discarded and a new fluid supply tank attached to the device.
[0065] Each electrode of the one or more electrodes may be secured to a lower face of the accessory; and one or more of the one or more electrodes sit flush with the lower face of the accessory, or protrudes beyond the lower face of the accessory. In use, the device utilises gravity to thereby effect wetting of the internal face of the electrode. The skilledperson would understand that the important factor is that in use, the electrode must contact the user’s head, such as the middle of the user’s head.
[0066] One or more electrodes, such as each electrode of the one or more electrodes may be in direct fluidic communication with the reservoir via a valve, allowing fluid flow from the reservoir to the electrode. When the device comprising the one or more electrode is placed on the user’s head, the electrode may be urged into the valve to actuate it to an open position whereby wetting of the electrode occurs.
[0067] The valve may be a one-way valve. The one-way valve may prevent fluid flow from the electrode to the reservoir, but allow fluid flow from the reservoir to the electrode.
[0068] Alternatively, one or more electrodes, such as each electrode of the one or more electrodes may be in direct fluid communication with the reservoir actuated via a spring. The electrode may be retained on a spring that exhibits resilient bias to a position in which the electrode does not contact the reservoir. When the device comprising the electrode is placed on the user’s head, the electrode may be urged into the reservoir to thereby wet the electrode. This example is particularly effective when the reservoir comprises a hygroscopic material. Therefore, upon contacting the hygroscopic material, the electrode may be wet through absorption of fluid from the hygroscopic material.
[0069] One or more of the electrodes, such as each electrode of the one or more electrodes may be in indirect fluidic communication with the reservoir. As such, water may be released from the reservoir via an aperture in the head contacting surface of the reservoir. Such an aperture may be an open ended conduit, nozzle, and the like. The electrode may be housed in close proximity to this aperture such that, in use, the electrode is wet by the fluid flowing from the aperture. The size of the aperture may be adjustable such that the flow rate of fluid from the reservoir may be regulated. When not in use, the aperture may be sealed by a plug, or may comprise a tap actuatable between a closed and open position to prevent fluid flow from the reservoir.
[0070] Where the electrode is in indirect fluidic communication with the reservoir, each electrode may comprise an associated aperture. Alternatively, where the electrodes are grouped in close proximity to an aperture such that effective wetting of the electrodesmay be enabled by the aperture, a plurality of electrodes may comprise an associated aperture.
[0071] The accessory comprises a plurality of electrodes, such as two or more, five or more, eight or more, or eleven or more electrodes. These electrodes enable a strong EEG signal to be obtained from the user.
[0072] Each electrode of the plurality of electrodes independently comprises an electrical contact configured to, in use, provide electrical connection between the device and each electrode. This ensures each electrode is in electrical communication with the device.
[0073] The electrode may be a sponge electrode. In one example, the electrode may be a ceramic electrode. This ensures uniform distribution of water across the whole electrode, and regulates water flow from the reservoir.
[0074] In the biophysiological wearable acquisition device, the reservoir, one or more electrodes, and one or more electrical contacts may be provided as the accessory of the second aspect.
[0075] In the biophysiological wearable acquisition device, the device may comprise a conduit extending between the reservoir and a fluid supply tank.
[0076] In the biophysiological wearable acquisition device, the fluid supply tank may be defined within the left and / or right headphone, in use enabling fluidic connection between the fluid supply tank and the reservoir.
[0077] In the biophysiological wearable acquisition device, the fluid supply tank may be removably couplable to the left and / or right headphone, in use enabling fluid supply tank and the reservoir.
[0078] In the biophysiological wearable acquisition device, the fluid supply tank may comprise a diaphragm actuatable to urge fluid from the supply tank to the reservoir via the conduit. Such a diaphragm may be a spring-loaded plunger, compressible pouch, and the like.In the biophysiological wearable acquisition device, the left and / or right headphone may comprise electrodes extending from the inner surfaces of the headphone. The electrodes extending from the inner surfaces of the headphone may be sponge electrodes, textile electrodes, or rubber electrodes. As such, these electrodes may contact the ear and / or side of the head of the user such that an EEG signal may be obtained.
[0079] The left headphone may comprise an ear cup. The right headphone may comprise an ear cup. The left headphone may comprise a left earcup and the right headphone may comprise a right earcup.
[0080] The left and / or right earcup may comprise textile electrodes. The left and / or right earcup may comprise rubber electrodes. The left and / or right earcup may comprise sponge electrodes. In use, these electrodes contact the sides of the user’s head. These textile, rubber, or sponge electrodes may be used in combination with the sponge electrodes placed on the top of the head of the user to obtain an EEG signal from the user.
[0081] The electrodes extending from the headphone, left earcup and / or right ear cup may not require wetting in order to obtain an EEG signal from the user, if they are directly in contact with the skin of the user.
[0082] In the biophysiological wearable acquisition device, further to comprising the accessory of the second aspect, the device may further comprise an attachment comprising one or more electrodes, optionally as defined herein. The one or more electrodes may be a sponge electrode, ceramic electrode, textile electrode, or comb electrode. The attachment may be provided further to the accessory of the second aspect. The attachment may be couplable to the headset such that, in use, the one or more electrodes are in contact with the head of the user, such as the forehead, or portions of the head around the ear. The skilled person would understand that where an attachment comprising one or more electrodes is present, in use, the one or more electrodes are in electrical contact with a power source within the device.
[0083] The attachment may be couplable to a headset of a wearable biophysiological acquisition device at an upper or lower edge of the attachment. In one example, the attachment may be couplable to the headset of a wearable biophysiological acquisition device at an upper or lower face of the attachment. It may be possible for the attachmentto be couplable to the headset of a wearable biophysiological acquisition device at one or more side walls of the attachment. This enables the attachment to be attached to or decoupled from the headset.
[0084] The upper or lower edge of the attachment may be removably couplable to the headset of the wearable biophysiological acquisition device. In one example, the upper or lower face of the attachment may be removably couplable to the headset of the wearable biophysiological acquisition device. This enables the attachment to be securely coupled to a headset of a wearable biophysiological acquisition device when in use and detached from a headset of wearable biophysiological acquisition device when not in use. For example, the attachment may be replaced once fluid levels in the reservoir have been exhausted.
[0085] The upper or lower edge of the attachment may be couplable to the headband of a headset of a wearable biological acquisition device. In one example, the upper or lower face of the attachment may be couplable to the headband of a headset of a wearable biological acquisition device. The upper or lower edge of the attachment is preferably removably couplable to the headband of a headset. The upper or lower face of the attachment is preferably removably couplable to the headband of a headset. In use, this enables the one or more electrodes to contact the head of the user. This is particularly useful for contacting the middle of the head of the user, or forehead of the user.
[0086] The upper or lower edge of the attachment may be couplable to a central portion of the headband. In one example, the upper or lower face of the attachment may be couplable to a central portion of the headband. The upper or lower edge of the attachment may be preferably removably, or detachably, couplable to the central portion of the headband. The upper or lower face of the attachment may be preferably removably, or detachably, couplable to the central portion of the headband. The central portion of the headband in use may sit above the top of the user’s head. In use, this enables the one or more electrodes to contact the head of the user, and they may sit substantially centrally on the head of the user, or extend to sit on the forehead of the user.
[0087] The upper or lower edge of the attachment may be couplable to an off-centre portion of the headband. In one example, the upper or lower face of the attachment may be couplable to an off-centre portion of the headband. The upper or lower edge of theattachment may be preferably removably, or detachably, couplable to the off-centre portion of the headband. The upper or lower face of the attachment may be preferably removably, or detachably, couplable to the off-centre portion of the headband. The off-centre portion of the headband in use may sit above the top of the user’s head, or towards the user’s ears. In use, this enables the one or more electrodes to contact the head of the user, and they may sit substantially off-centrally on the head of the user.
[0088] The upper or lower edge of the attachment may comprise a headset engaging formation configured to interact with an attachment engaging formation on a headset of a wearable biophysiological acquisition device such that, in use, the attachment is securely coupled to a headset of a wearable biophysiological acquisition device.
[0089] The upper or lower face of the attachment may comprise a headset engaging formation configured to interact with an attachment engaging formation on a headset of a wearable biophysiological acquisition device such that, in use, the attachment is securely coupled to a headset of a wearable biophysiological acquisition device.
[0090] The attachment engaging formation may be on the headband of the headset, such as an upper or lower face of the headband. These engaging formations enable the attachment to be securely coupled to the wearable biophysiological acquisition device when in use, and enable the attachment to be detached from the wearable biophysiological acquisition device when not in use.
[0091] The headset engaging formation and attachment engaging formations may be complementary. As such, in use, the headset engaging formation engages with the complementary second formation to securely couple the attachment to a headset of a wearable biophysiological acquisition device.
[0092] The headset engaging formation and attachment engaging formation may be interengaging clips.
[0093] The first and second formations may be fastening means that are actuatable between a locked configuration and an unlocked configuration. The locked configuration may be where the attachment is securely coupled to a headset of a wearable biophysiological acquisition device. The unlocked configuration may be where the attachment isdetachable from the headset of a wearable biophysiological acquisition device. These configurations enable the attachment to be securely coupled to the headset when in use, but removable when not in use.
[0094] Fastening means to couple the attachment to the wearable biological acquisition device would be apparent to the skilled person. Examples of fastening means include clips, magnets, Velcro®, press studs, screws, nuts, bolts, and the like.
[0095] The skilled person would additionally be aware of how the fastening means are actuated from a locked configuration to an unlocked configuration and vice versa. For example, where the fastening means is a press stud, the headset engaging formation may be a stud, and the second formation may be a recess. Alternatively, the headset engaging formation may be a recess, and the second formation may be a stud. Actuation from the unlocked to the locked configuration requires the stud to be urged into the recess, and actuation from the locked configuration to the unlocked configuration requires the stud to be removed from the recess.
[0096] The fluid may comprise a saline solution. The fluid may be an electrolyte solution. This ensures each electrode has a sufficient supply of saline or electrolyte solution such that each electrode can perform its function.
[0097] In the method of coupling an accessory to a headset of a wearable biophysiological acquisition device, step (c) of securely coupling the accessory to the headband, left headphone, and / or right headphone of the headset may comprise coupling the accessory engaging formation on a headset of a wearable biophysiological acquisition device to a headset engaging formation on the upper edge of the accessory. Step (c) of securely coupling the accessory to the headset may comprise securely coupling the accessory to the headband of the headset. Step (c) of securely coupling the accessory to the headset may comprise securely coupling the accessory to the left headphone of the headset. Step (c) of securely coupling the accessory to the headset may comprise securely coupling the accessory to the right headphone of the headset. Step (c) of securely coupling the accessory to the headset may comprise securely coupling the accessory to the left and right headphone. Step (c) of securely coupling the accessory to the headset may comprise securely coupling the accessory to the headband and one or both headphones. These formations enable the accessory is attached to the headset.In the method of coupling an accessory to a headset of a wearable biophysiological acquisition device, step (a) may further comprise the step of filling the reservoir with a first amount of fluid. This may be done using any of the fluid filling means discussed herein.
[0098] In use, the electrodes measure EEG signals from the user, wherein the EEG signals from the electrodes are led by a conductive layer to electrical input circuits for the acquisition of electroencephalographic signals.
[0099] These signals are further led to electrical circuits for further processing and then the processed values are led to the integrated module for wireless transmission of digital signals (e.g. Bluetooth, Wi-Fi, and the like). Such signals are then transmitted wirelessly to devices for receiving and visualization, which are essentially mobile phones or computers.
[0100] Also, acquired and processed signals could be transmitted via direct internet connection, for example using a 4G, 5G, Wi-Fi module or equivalent, from the device to a central server for processing and storage in the central database.
[0101] Acquired signals may be entirely processed on the recording device, or may be transmitted by a short distance digital data transmission network (such as a Bluetooth network) to a device for processing, display and storage of biophysiological signals which is essentially a mobile phone or personal computer, or may be directly transmitted to a central server for further processing by long distance digital data transmission network(such as the Internet), e.g. by using the 4G module, 5G module, or Wi-Fi module. The signals could also be partially processed on the device for the acquisition of biophysiological signals on the central server and on the device for processing, display and storage of biophysiological signals.
[0102] EEG signal features that are used to measure mental states may be the frequency bands: (a: (8-13 Hz), : (13-32 Hz), y: 32-60 Hz, 5: 1-4 Hz, 0: 4-8 Hz) and ratios between the frequency bands measured from different measurement points (electrodes) as well as the amplitudes and latencies of certain waves contained in evoked potentials recorded using EEG sensors (such as the P100, N200, P300, N400, or others) that occur as aresult of stimuli (visual or auditory), which could be presented to the subject through the headphones embedded in the wireless head set, or using the screen of a mobile phone that the device has established a wireless connection with (e.g. Bluetooth connection) or through a third party device or from the environment.
[0103] It is intended that the accessory of the invention could work with existing headsets, such as those described in US 2019 / 0053766 Al. It is intended that the electronic components used would be applicable in the device of the invention, optionally comprising the accessory of the second aspect.
[0104] The headset may comprise power storage and internal electrical circuitry to provide power to the electrodes, support EEG signal transmission and / or enable headphone function.
[0105] It will be understood that where reference it made to the accessory in use, this refers to the accessory when securely coupled to the wearable biophysiological acquisition device of the first aspect.
[0106] As such, references to terms such as couplable would be understood as coupled when in use.
[0107] Detailed Description
[0108] Examples of the present invention will now be described by way of example with reference to the accompanying drawings, in which:
[0109] Figure 1 is a side view of the accessory in use;
[0110] Figure 2 shows a cross section of a first wearable biophysiological acquisition device with liquid filled reservoir;
[0111] Figure 3 shows a cross section of a second wearable biophysiological acquisition device with liquid filled reservoir;
[0112] Figure 4 shows a cross section of a third wearable biophysiological acquisition device with liquid filled reservoir;
[0113] Figure 5 shows a cross section of a fourth wearable biophysiological acquisition device with liquid filled reservoir;Figure 6 shows a cross section of a fifth wearable biophysiological acquisition device with liquid filled reservoir;
[0114] Figure 7 shows a cross section of a sixth wearable biophysiological acquisition device with liquid filled reservoir;
[0115] Figure 8 shows a cross section of a seventh wearable biophysiological acquisition device with liquid filled reservoir;
[0116] Figure 9 shows a cross section of an eighth wearable biophysiological acquisition device with liquid filled reservoir;
[0117] Figure 10 shows a cross section of the detachable coupling of the accessory to the device;
[0118] Figure 11 shows a cross section of the detachable coupling of the reservoir to the device;
[0119] Figure 12 shows a side view of the wearable biophysiological acquisition device with a first hygroscopic insert;
[0120] Figure 13 shows a side view of the wearable biophysiological acquisition device with a second hygroscopic insert;
[0121] Figure 14 shows a cross sectional view of the wearable biophysiological acquisition device with hygroscopic insert as an accessory;
[0122] Figure 15 shows a front view of a first example of refilling the reservoir;
[0123] Figure 16 shows a front view of a second example of refilling the reservoir; Figure 17 shows a front view of a third example of refilling the reservoir; Figure 18 shows a front view of a fourth example of refilling the reservoir; Figure 19 shows a front view of a fifth example of refilling the reservoir; Figure 20 shows a front view of a sixth example of refilling the reservoir; Figure 21 shows a first exemplary method of liquid release and electrode moistening;
[0124] Figure 22 shows a second exemplary method of liquid release and electrode moistening;
[0125] Figure 23 shows a third exemplary method of liquid release and electrode moistening;
[0126] Figure 24 shows a fourth exemplary method of liquid release and electrode moistening;
[0127] Figure 25 shows a fifth exemplary method of liquid release and electrode moistening;Figure 26 shows a first example of enabling fluid flow from a fluid supply tank in a headphone to the reservoir;
[0128] Figure 27 shows a second example of enabling fluid flow from a fluid supply tank in a headphone to the reservoir;
[0129] Figure 28 shows a third example of enabling fluid flow from a fluid supply tank in a headphone to the reservoir;
[0130] Figure 29 shows a schematic diagram of the method of coupling the accessory to a headset.
[0131] Referring to Figure 1 of the accompanying drawings, there is shown a side view of the accessory in use. Accessory 100 is coupled to the headband 102 of the wearable biophysiological device 104 at an upper edge 106 of the accessory 100. The coupling of the accessory 100 to the headband 102 is enabled through the use of clips 108. The clips 108 both securely fasten the accessory 100 to the headband 102 and enable electrical contact between the electrodes and the device 104. The accessory 100 comprises a reservoir 110, defined internally by the accessory 100. The reservoir 110 is configured to receive a fluid. Regions 112 for one or more sponge electrodes are shown. These regions 112 are in fluid connection to the reservoir. Left and right headphones are not shown, but are envisaged as part of the wearable biophysiological acquisition device 104.
[0132] Referring to Figure 2 of the accompanying drawings, there is shown a cross section of a first wearable biophysiological acquisition device 204 with liquid-filled reservoir 210. The device additionally has a left and right headphone 214. Only the left headphone has been referenced in the drawings. The reservoir 210 may be located within the headband 202 of the wearable biophysiological acquisition device 204. Electrodes 212 are shown, which in use may be wet through the fluid connection with the reservoir 210.
[0133] Referring to Figure 3 of the accompanying drawings, there is shown a cross section of a second wearable biophysiological acquisition device 304 with liquid-filled reservoir 310. The device additionally has a left and right headphone 314. Only the left headphone has been referenced in the drawings. The reservoir 310 may be located within the headband 302 of the wearable biophysiological acquisition device 204. It can be seen that the reservoir 310 is split into several different section, such as chambers. The chambers may be connected together such that they are in fluidic communication, or beseparate such that they are fluidically isolated. Electrodes 312 are shown, which in use may be wet through the fluid connection with the reservoir 310.
[0134] Referring to Figure 4 of the accompanying drawings, there is shown a cross section of a third wearable biophysiological acquisition device 404 with liquid-filled reservoir 410. The device additionally has a left and right headphone 414. Only the left headphone has been referenced in the drawings. The reservoir 410 may be located within the headband 402 of the wearable biophysiological acquisition device 404. It can be seen that the reservoir 410 is split into several different section, such as chambers. Electrodes 412 are shown, which in use may be wet through the fluid connection with the reservoir 410.
[0135] Referring to Figure 5 of the accompanying drawings, there is shown a cross section of a fourth wearable biophysiological acquisition device 504 with liquid-filled reservoir 510. The device additionally has a left and right headphone 514, which define the liquid-filled reservoir 510. Three different types of reservoir 5 lOa-c are shown. Reservoir 510a depicts the case where the reservoir has multiple chambers. Reservoir 510b depicts the case where the reservoir is a single chamber. Reservoir 510c depicts the case where the reservoir is located within the ear cushion of a headphone. Electrode 512 are shown, which in use may be wet through the fluid connection with the reservoir 510.
[0136] Referring to Figure 6 of the accompanying drawings, there is shown a cross section of a fifth wearable biophysiological acquisition device 604 with liquid-filled reservoir 610. The device additionally has a left and right headphone 614. Only the left headphone has been referenced in the drawings. The reservoir 610 may be located within the headband 602 of the wearable biophysiological acquisition device 604. It can be seen that the reservoir 610 is split into several different sections, such as chambers. Electrodes 612 are shown, which in use may be wet through the fluid connection with the reservoir 610.
[0137] Referring to Figure 7 of the accompanying drawings, there is shown a cross section of a sixth wearable biophysiological acquisition device 704 with liquid-filled reservoir 710. The device additionally has a left and right headphone 714. Only the left headphone has been referenced in the drawings. The reservoir 710 may be a separate component couplable to the headband 702 of the wearable biophysiological acquisition device 704.It can be seen that the reservoir 710 is a single section, such as chamber. Electrode 712 are shown, which in use may be wet through the fluid connection with the reservoir 710.
[0138] Referring to Figure 8 of the accompanying drawings, there is shown a cross section of a seventh wearable biophysiological acquisition device 804 with liquid-filled reservoir 810. The device additionally has a left and right headphone 814. Only the left headphone has been referenced in the drawings. The reservoir 810 may be located within accessory 800, which is coupled to headband 802 of the wearable biophysiological acquisition device 804. It can be seen that the reservoir 810 comprises multiple sections, such as chambers. Electrodes 812 are shown, which in use may be wet through the fluid connection with the reservoir 810.
[0139] Referring to Figure 9 of the accompanying drawings, there is shown a cross section of an eighth wearable biophysiological acquisition device 904 with liquid-filled reservoir 910. The device additionally has a left and right headphone 914. Only the left headphone has been referenced in the drawings. Three different types of reservoir 910a, 910b, 910c are shown. Reservoir 910a is an external reservoir which is in fluid connection with the device 904 via conduit 916. Reservoir 910b may be an external reservoir coupled to the device 904. Reservoir 910c may be part of an accessory, such as accessory 100 in Figure 1. Electrode 912 are shown, which in use may be wet through the fluid connection with the reservoir 910.
[0140] Referring to Figure 10 of the accompanying drawings, there is shown a cross section of the detachable coupling of the accessory 1000 to the device 1004. The device additionally has a left and right headphone 1014. Only the left headphone has been referenced in the drawings. Accessory 1000 is couplable to the headband 1002 at an upper edge 1006 of the accessory 1000. The accessory 1000 comprises a reservoir 1010, defined internally by the accessory 1000. Electrodes 1012 are shown, which in use may be wet through the fluid connection with the reservoir 1010. Dashed lines indicate the position of the accessory 1000 when coupled to the headband 1002.
[0141] Referring to Figure 11 of the accompanying drawings, there is shown a cross section of the detachable coupling of the reservoir 1110 to the device 1104. The device additionally has a left and right headphone 1114. Only the left headphone has been referenced in the drawings. The reservoir 1110 is couplable to the headband 1102 at alower edge 1118 of the reservoir. Electrodes 1112 are shown, which in use may be wet through the fluid connection with the reservoir 1110. Dashed lines indicate the position of the reservoir 1110 when coupled to the headband 1102.
[0142] Referring to Figure 12 of the accompanying drawings, there is shown a side view of the wearable biophysiological acquisition device 1204 with a hygroscopic insert 1220. In the illustrated biophysiological acquisition device 1204, there is shown an insert 1220 with hygroscopic foam or beads that have a high water capacity. The insert 1220 may slot into an aperture 1222 in the headband 1202. The insert 1220 may be considered a reservoir. Left and right headphones are not shown, but are envisaged as part of the wearable biophysiological acquisition device 1204.
[0143] Referring to Figure 13 of the accompanying drawings, there is shown a variation on Figure 12 in which the illustrated insert 1324 has hygroscopic foam in the form of tablets that can be individually removed from the device 1304. The insert 1324 may be couplable to the headband 1203 of the device 1304. The insert 1324, or reservoir, whether integrated into the headphones or as a detachable accessory or component, can be filled with or made of a homogeneous or heterogeneous absorbent (hygroscopic) material capable of retaining and releasing liquid over an extended period. Such hygroscopic materials may include sponge, foam, gel, porous ceramic, mineral sand, and the like. The reservoir can be temporarily filled with such material, allowing it to be refilled and emptied, or it can permanently contain the material. This material functions to release liquid directly or indirectly within the headphones, into and through their components, or partially and entirely outside. This material can be located inside or on the exterior of the headphones. Such an element can be an integral part of the entire headphones or a specific segment (e.g., electrodes, ear cups, frame, etc.). The hygroscopic insert 1324 may form part of an accessory as mentioned in Figure 1.
[0144] Referring to Figure 14 of the accompanying drawings, there is shown a cross sectional view of the wearable biophysiological acquisition device with hygroscopic inserts coupled to the device. The hygroscopic insert in this figure is equivalent to the accessory as mentioned in Figure 1. The illustrated device 1404 includes accessory 1400 coupled to the headband 1402 of the device 1404. The accessory 1400 comprises three chambers filled with hygroscopic material 1426. The accessory comprises headset engaging formations at the upper edge 1406 of the accessory 1400. The headset engagingformations may be in the form of clips 1408. The accessory 1400 also comprises electrodes 1412. Only one of the electrodes 1412 are labelled for clarity. In the illustrated example, only the electrode tips are exposed, as they are integrated into the accessory 1400, and may be made of porous ceramic or sponge materials. In use, the hygroscopic material may be compressed to thereby release liquid and wet the electrodes.
[0145] Referring to Figure 15 of the accompanying drawings, there is shown a front view of a first example of refilling the reservoir of the device 1504 as depicted in any one of Figures 1-13. This first example involves direct pouring 1528 of liquid into one of the headphone components through a fluid refilling means 1530, such as a valve, cap, or cover, which can be located anywhere on the wearable biophysiological acquisition device 1504. The fluid refilling means 1530 may be fluidly connected to the reservoir.
[0146] Referring to Figure 16 of the accompanying drawings, there is shown a front view of a second example of refilling the reservoir of the device 1604 as depicted in any one of Figures 1-13. This second example involves indirect pouring of liquid using a designated tool 1632 such as a syringe, pump, funnel, pressurized bottle, small bottle, or pouch through a fluid refilling means 1630, such as a valve, cap, or cover, which can be located anywhere on the wearable biophysiological acquisition device 1604.
[0147] Referring to Figure 17 of the accompanying drawings, there is shown a front view of a third example of refilling the reservoir of the device 1704 as depicted in any one of Figures 1-13, involving partial 1734 or complete 1736 immersion of the wearable biophysiological acquisition device 1704, accessory or component that forms part of the functional assembly with the wearable biophysiological acquisition device, resulting in the retention of liquid within the device. A fluid refilling means as depicted in Figures 15 and 16 is present, although not shown in Figure 17.
[0148] Referring to Figure 18 of the accompanying drawings, there is shown a front view of a fourth example of refilling the reservoir of the device 1804 as depicted in any one of Figures 1-13. This fourth example involves extraction of fluid from an external vessel 1838 and transferring it into the wearable biophysiological acquisition device 1804 using an integrated, designated component of the device, such as a conduit 1816. In use, the conduit 1816 extends between the fluid supply tank 1840 and reservoir 1810. Thecoupling between the conduit 1816 and reservoir 1810 may be separable such that refilling can occur. Figure 18 also depicts a diaphragm 1842 within the fluid supply tank 1840. When the conduit 1816 is coupled to both the fluid supply tank 1840 and reservoir 1810, expansion of the diaphragm 1842 causes fluid to move from the fluid supply tank 1840, pass through the conduit 1816 and into the reservoir 1810. From the reservoir 1810, the fluid may then cause wetting of the electrodes 1812.
[0149] Referring to Figure 19 of the accompanying drawings, there is shown a front view of a fifth example of refilling the reservoir of the device 1904 as depicted in any one of Figures 1-13. This fifth example involves placing the wearable biophysiological acquisition device 1904 on a stand or case 1946 through which liquid is soaked or conveyed directly or indirectly into the interior or exterior of the wearable biophysiological acquisition device via nozzles 1944, tubing, valves, or water vapour. The stand or case 1946 may additionally be a battery recharging station to charge the device 1904.
[0150] Referring to Figure 20 of the accompanying drawings, there is shown a front view of a sixth example of refilling the reservoir of the device 2004 as depicted in any one of Figures 1-13. This sixth example involves the use of reusable or disposable capsules 2048. These capsules may comprise saline solution or electrolyte solution. They may be pre-filled with liquid or a hygroscopic material that contains liquid. These capsules may release liquid when activated by a specific mechanism, either before or during headphone use. They may also comprise a spongy or hard material such as porous ceramic, plastic, rubber, silicone on their outer surface. This material may become saturated with liquid released from the interior of the capsule, and may also contain a connector or electro-conductive material on their inner or outer surfaces, enabling them to potentially serve as electrodes.
[0151] Referring to Figure 21 of the accompanying drawings, there is shown a cross-sectional view of the electrode 2112 in fluidic communication with reservoir 2110 via valve 2150. Upon depression of the electrode 2112, the valve 2150 to release water from the reservoir 2110 and moisten the sponge electrode 2112.
[0152] Referring to Figure 22 of the accompanying drawings, there is shown a cross-sectional view of the electrode 2212 in fluidic communication with reservoir 2210 via spring2252. When the electrode 2212 contacts the head of the user, the electrode 2212 presses into the reservoir 2210 and transfers water to the electrode 2212.
[0153] Referring to Figure 23 of the accompanying drawings, there is shown a cross-sectional view of the electrode 2312 in fluidic communication with reservoir 2310. This fluidic communication an indirect communication, as water may be released from the reservoir 2310 via nozzle 2354 upon contact with the user’s head 2356.
[0154] Referring to Figure 24 of the accompanying drawings, there is shown a cross-sectional view of an example of the wearable biophysiological acquisition device as discussed in relation to Figure 18. In the device depicted in Figure 24, the fluid supply tank 2440 is located in the headphone, and expansion of the diaphragm (not shown) causes fluid to move from the fluid supply tank 2440, pass through the conduit 2416, which is in the form of cords or tubes, and into the reservoir 2410. From the reservoir 2410, the fluid may then cause wetting of the electrodes 2412.
[0155] Referring to Figure 25 of the accompanying drawings, there is shown a cross-sectional view of a recharging station 2556 that the wearable biophysiological acquisition device may be coupled to, such that capillary action wets the electrodes 2512.
[0156] Referring to Figure 26 of the accompanying drawings, there is shown a cross-sectional view of an example of the headphone section of the device as discussed in Figures 18 and 24. The diaphragm is shown in the form of a spring-loaded plunger 2658. Pressing the plunger button expels water from the fluid supply tank 2640, through the conduit 2616 and into the reservoir (not shown).
[0157] Referring to Figure 27 of the accompanying drawings, there is shown a cross-sectional view of an example of the headphone section of the device as discussed in Figures 18 and 24. The diaphragm is shown in the form of compressible ear muff 2760. Pressing the ear muff 2760 in the direction of the arrows (such as in use), expels air into the interior of the fluid supply tank 2740, thereby forcing water from the fluid supply tank 2740, through the conduit 2716 and into the reservoir (not shown).
[0158] Referring to Figure 28 of the accompanying drawings, there is shown a cross-sectional view of an example of the headphone section of the device as discussed in Figures 18and 24. This is similar to Figure 27, although when worn, only pressure is exerted on the fluid supply tank 2840 through ear muff 2862. This is enough to force water from the fluid supply tank 2840, through the conduit 2816 and into the reservoir (not shown).
[0159] Referring to Figure 29 of the accompanying drawings, there is shown a schematic of the method of coupling the accessory to a headset of a wearable biophysiological acquisition device. Step 2964 depicts providing an accessory of the second aspect. Step 2966 depicts providing a headset comprising a headband coupled to a left headphone at a first end of the headband and the headband coupled to a right headphone at a second end of the headband. Step 2968 depicts securely coupling the accessory to the headband of the headset, such as the central portion of the headband of the headset.
[0160] It will be understood that the invention is not limited to the examples above-described and various modifications and improvements can be made without departing from the concepts described herein. Except where mutually exclusive, any of the features may be employed separately or in combination with any other features and the disclosure extends to and includes all combinations and sub-combinations of one or more features described herein.
Claims
CLAIMS1. A wearable biophysiological acquisition device comprising:a headset comprising a headband coupled to a left headphone at a first end of the headband and coupled to a right headphone at a second end of the headband;a reservoir coupled to or formed in the headset and comprising one or more chambers configured to hold a fluid;one or more electrodes fluidically connected to the reservoir; andone or more electrical contacts coupled to the reservoir;wherein the one or more electrical contacts provide electrical connection between the device and the one or more electrodes.
2. A wearable biophysiological acquisition device of claim 1, wherein the one or more electrodes are indirectly fluidically connected to the reservoir.
3. The wearable biophysiological acquisition device of claim 1 or claim 2, wherein the reservoir is or comprises one or more chambers defined within the headset.
4. An accessory for use with a wearable biophysiological acquisition device comprising:a reservoir comprising one or more chambers configured to hold a fluid; one or more electrodes fluidically connected to the reservoir; andone or more electrical contacts configured to, in use, provide electrical connection between the device and the electrode.
5. The accessory of claim 4, wherein the reservoir is configured to receive a first amount of fluid, and provide said fluid to the one or more electrodes through the fluidic connection.
6. The accessory of any one of claims 4 or 5, wherein the reservoir comprises one or more chambers, optionally wherein the one or more chambers comprise a hygroscopic material.
7. The accessory of any one of claims 4-6, wherein the accessory comprises fluid refilling means through which fluid can be received by the reservoir.
8. The accessory of any one of claims 4-7, wherein the accessory is couplable to a headset of a wearable biophysiological acquisition device at an upper or lower edge of the accessory, optionally wherein the upper or lower edge of the accessory is removably couplable to the headset of the wearable biophysiological acquisition device.
9. The accessory of claim 8, wherein the upper or lower edge of the accessory comprises a headset engaging formation configured to interact with an accessory engaging formation on a headset of a wearable biophysiological acquisition device such that, in use, the accessory is securely coupled to a headset of a wearable biophysiological acquisition device.
10. The accessory of claim 9, wherein the headset engaging formation and accessory engaging formation are fastening means that are actuatable between a locked configuration and an unlocked configuration.
11. The accessory of any one of claims 4-10, wherein the accessory further comprises a conduit in fluidic communication with the reservoir and a fluid supply tank.
12. The accessory of any one of claims 4-11, wherein:the electrode is secured to a lower face of the accessory; andthe electrodes sits flush with the lower face of the accessory, or protrudes beyond the lower face of the accessory.
13. The accessory of any one of claims 4-12, wherein the accessory comprises a plurality of electrodes.
14. The accessory of claim 13, wherein each electrode of the plurality of electrodes independently comprises an electrical contact configured to, in use, provide electrical connection between the device and each electrode.
15. The accessory of any one of claims 4-14, wherein the electrode is a sponge or ceramic electrode.
16. The accessory of any one of claims 4-15, wherein at least one electrode of the one or more electrodes is in direct fluid communication with the reservoir:(i) via a valve, such as a one-way valve; or(ii) actuated by a spring.
17. The accessory of any one of claims 4-16, wherein at least one electrode of the one or more electrodes is in indirect fluid communication with the reservoir, wherein the reservoir comprises an aperture in a head contacting surface of the reservoir.
18. The wearable biophysiological acquisition device of claim 1 or claim 2, wherein the reservoir, one or more electrodes, and one or more electrical contacts are provided as the accessory of any one of claims 4-17.
19. The wearable biophysiological acquisition device of claim 18, wherein the upper or lower edge of the accessory is securely coupled to the headband, preferably securely coupled to a central portion of the headband.
20. The wearable biophysiological acquisition device of claim 19, wherein the headband comprises an accessory engaging formation that interacts with a headset engaging formation on the accessory to securely couple the accessory to a headset of a wearable biophysiological acquisition device.
21. The wearable biophysiological acquisition device of any one of claims 1-3 or 18-20 comprising a conduit extending between the reservoir and a fluid supply tank.
22. The wearable biophysiological acquisition device of claim 21, wherein the fluid supply tank is defined within the left and / or right headphone, in use enabling fluidic connection between the fluid supply tank and the reservoir.
23. The wearable biophysiological acquisition device of claim 21, wherein the fluid supply tank is removably couplable to the left and / or right headphone, in use enabling fluid supply tank and the reservoir.
24. The wearable biophysiological acquisition device of claim 22 or claim 23, wherein the fluid supply tank comprises a diaphragm actuatable to urge fluid from the supply tank to the reservoir via the conduit.
25. A kit of parts for a wearable biophysiological device, the kit comprising:a headband;a left headphone;a right headphone;an accessory according to any one of claims 4-17; and optionallya charger.