BIO-ELECTRICAL SIGNAL MONITOR WITH TWO SPEAKERS

Abstract

A personal wearable monitor for monitoring a bio-electrical signal from a person. The monitor is adapted for detecting an upcoming seizure, and for providing an acoustical information signal. The monitor is provided with a first speaker (13) for providing the information signal, and a second speaker (14) is adapted for functioning as a microphone in testing if said first speaker is capable of providing a sound. The second speaker is also a back-up speaker. The monitor is adapted for providing a notification in the event that the second speaker (14) does not detect the generated sound from the first speaker (13).

Claims

1. A personal wearable monitor for monitoring a bin-electrical signal from a person, said monitor being adapted for detecting a condition of an upcoming seizure, and for providing an acoustical information signal, said monitor being provided with a first speaker for providing said information signal, and a second speaker adapted for functioning as a microphone in testing if said first speaker is capable of delivering a sound, and said monitor being adapted for providing a notification in the event that said first speaker is not capable of delivering sound.

2. The monitor according to claim 1, adapted for providing said notification as acoustical information by said second speaker.

3. The monitor according to claim 1, adapted for providing a verification signal through said first speaker, wherein the verification signal is provided at specific time intervals and in a specific frequency range.

4. The monitor according to claim 1, wherein at least one of said first or second speakers is adapted for being applied as a microphone for picking-up the background sound level.

5. The monitor according to claim 1, comprising a signal processor adapted for analyzing said bio-electrical signal in order to identify or predict conditions of predetermined biological incidents in said person.

6. The monitor according to claim 1, comprising a decision means adapted to decide when information is to be presented to said person.

7. The monitor according to claim 1, wherein said acoustical information signal is in the form of a spoken message or a beep.

8. The monitor according to claim 1, wherein said monitor is arranged at the ear.

9. The monitor according to claim 1, wherein said acoustical information signal is provided to the ear canal of said person.

10. The monitor according to claim 1, wherein the first and second speakers are arranged to share a common sound tubing to guide the sound.

11. The monitor according to claim 1, wherein the first and second speakers are arranged together as an integral unit.

12. The monitor according to claim 1, wherein said first speaker is adapted for functioning as a microphone, and wherein said monitor is adapted for testing if said second speaker is capable of delivering a sound.

13. The monitor according to claim 1, comprising a radio adapted for notifying a remote unit wirelessly if a speaker is not capable of delivering a sound.

14. A method for monitoring a bio-electrical signal from a person, and for detecting a condition of an upcoming seizure by analysis of said signal, said method comprising providing an acoustical information signal to said person in the event that a condition of an upcoming seizure is detected, providing said information signal by a first speaker, testing if said first speaker is capable of delivering a sound by application of a second speaker as a microphone, and providing a notification in the event that said second speaker does not detect said sound from said first speaker.

15. The method according to claim 14, wherein said notification is provided as acoustical information by said second speaker.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0029] FIG. 1 illustrates a block diagram of a bio-electrical signal monitor;

[0030] FIG. 2 illustrates an embodiment where an EEG monitoring system is arranged at the ear of a person with an implant comprising electrodes arranged subcutaneously in the area behind the ear and with an external part comprising speakers;

[0031] FIG. 3 illustrates how two microphones can be arranged in a block in a part of a bio-electrical signal monitor;

[0032] FIG. 4 illustrates the monitor part of FIG. 3 with further components;

[0033] FIG. 5 illustrates one block with two microphones; and

[0034] FIG. 6 illustrates the block of FIG. 5, but seen from a different angle.

DETAILED DESCRIPTION OF THE INVENTION

[0035] FIG. 1 shows an example of the general layout of a monitor for monitoring bio-electrical signals. The monitor is in this example in two parts. One is an electrode part 3 comprising electrodes 12 for measuring or capturing bio-electrical signals such as EEG or ECG, and comprising an electronic module 10 for preprocessing the bio-electrical signals and sending, e.g. by a coil 7, this signal to the other part of the monitor. This other part is in this example a processor part 2 comprising a signal processor 4 for detecting a condition of an upcoming seizure from the monitored bio-electrical signal.

[0036] The two parts are in this example interconnected by an inductive link 9 established by the coil 7 in the electrode part 3, and a co-aligned coil 8 in the processor part 2. With this coupling the electrode part 3 may be implanted, e.g. with the coil 7 placed subcutaneous for easy alignment with the coil 8, which is arranged external to the skin. Thereby, the advantages of an implant, such as good electrical contact between the electrodes and the tissue, can be combined with the advantages of having the acoustic transducers in the open air, i.e. better sound quality. Another advantage is that power can he supplied from the external processor part, which will usually comprise a battery, and to the implanted electrode part 3, through the inductive link 9.

[0037] If the electrode part 3 is adapted for being arranged external on the skin, then the inductive link could be replaced by a wired connection, or by a radio connection. Also, the processor part 2 and the electrode part 3 may be built into the same housing, e.g. with the electrodes arranged external on this housing, or as separate pads with wiring to the housing.

[0038] The electrode part 3 will be arranged to submit the bio-electrical signal to the signal processor 4 in the processor part 2. Preferably, analogue to digital conversion will take place in the electronic module 10 of the electrode part 3. The signal processor 4 is arranged for continuous analysis of the bio-electrical signal and is adapted for identifying or predicting predetermined biological incidents in the person wearing the monitor based on said analysis. Or the signal processor 4 is adapted for identifying a condition e.g. where the experience says that there is a risk of a biological incidence.

[0039] The analysis of the signal processor 4 may be based on algorithms developed from large amounts of data, i.e. an empirical algorithm The signal processor preferably comprises a decision part adapted to decide when information is to be presented to said person. The decision part may comprise a classifier, classifying each sample of bio-electrical signal, where each sample represents a given time, e.g. 1 second. E.g. each sample could be classified into one of two groups: one where the risk for an upcoming seizure is present and one where the risk is insignificant. The classification may he based on empirical data.

[0040] In the example of FIG. 1, two speakers 13, 14 are arranged as part of the processor part 2. At least one of these speakers is adapted for providing an acoustical information signal. This information signal is often provided to the person being monitored, but could also be provided to other persons. The information signal can be in the form of an alarm sound, such as a beep sound, a spoken message or some other sound. Often, both speakers are adapted for being able to provide an acoustical information signal.

[0041] At least one of the speakers, e.g. the second speaker 14, is adapted for functioning as a microphone in testing if the other speaker, the first speaker 13, is capable of generating a sound. This will provide a safety fall-back operation in order to make sure that the monitor will be able to provide an acoustical information signal, e.g. an alarm, in the event that a condition of an upcoming seizure is identified. The signal processor 4 my provide a test signal to the first speaker 13, e.g. at regular time intervals. The second speaker 14 is then set up as microphone to detect the acoustical signal from the first speaker 13. In case the second speaker 14 does not detect any signal from the first speaker 13, or only detects insufficient signal level, the monitor is adapted for providing a notification that some kind of maintenance or repair is needed.

[0042] If it is detected that the first speaker 13 does not function correctly, any acoustical information signal, e.g. related to an upcoming seizure, can be provided through the second speaker 14, e.g. until replacement or repair of the first speaker has been performed.

[0043] The second speaker 14 may also provide an acoustic alarm or message informing that the first speaker is not functioning properly.

[0044] The second speaker 14 can be used for controlling specific test sounds generated by the first speaker 13. The second speaker can also be used for testing if an acoustic information signal is actually provided by the first speaker 13 and, in the case that the acoustic information signal is not delivered by the first speaker 13 at the time where it should have been given, the second speaker 14 will provide the acoustic information signal instead.

[0045] The monitor may be set up for testing also if the second speaker 14 is able to provide a test signal if this should be necessary, e.g. as back-up for a mal-functional first speaker 13. Test of the second speaker 14 could then be performed by the application of the first speaker 13 as microphone. In case the second speaker is found not to be functioning properly, a notification should be given.

[0046] As shown in FIG. 1 the processor part 2 may also comprise other components. An example of this is a radio 15 with an antenna 18 for wireless communication with remote units, such as a mobile phone or computer. This may be applied for notifying about a malfunctioning speaker. A memory which may be applied for storage of sequences of bio-electrical signals may be part of a monitor. The memory may also comprise a library of speech messages for being used as different acoustic information signals. Further to this the processor part will usually comprise a power supply, often in the form of a battery. If the processor part 2 and the electrode part 3 are arranged in the same housing, some of the components may be arranged independently of these two parts.

[0047] Often the two speakers 13, 14 will be of the same type. Several types of speakers, or receivers, may be applied. One example is the Receiver 4100 from Sonion A/S. This type of speaker could also be applied in hearing aids, where they are called receivers. The speakers will preferably be arranged with separate wiring, in order for the signal processor 4 to be able to access them individually.

[0048] In the embodiment where a test sound is provided at specific time intervals, the time intervals could e.g. be in the range once every 0.5 to 5 hours, preferably once every 1 to 2 hours. The frequency of the test sound could e.g. be in the range 1 to 6 kHz, preferably around 3 kHz, where the sensitivity of a speaker used as microphone is often high. It will be possible to play the test sound at a low sound level, in order not to bother the person being monitored.

[0049] FIG. 2 shows an example of a practical implementation of how a monitor may be arranged at the head 1 of the person to be monitored. The monitor is here arranged at the ear 5 or in connection with the ear or behind the ear. In FIG. 2 the processor part 2 of the monitor is arranged behind the ear 5 external to the skin. The electrode part 3 is implanted subcutaneous, also behind the ear. The electrode part 3 comprises an electronic module 10 arranged in a hermetically sealed housing with a coil 7. A wire 11 with three active and separate electrode points 12 is extending from this housing. The processor part 2 should then be arranged such that the coil 8 is aligned in relation to the coil 7 of the electrode part 3.

[0050] In FIG. 2 a casing 20 comprising both speakers 13, 14 is indicated inside the processor part 2. This casing 20 has an internal conduit or manifold (not shown) for connecting sound outputs of the speakers with a sound opening 21. A sound tube (not shown) could be applied for guiding the sound from sound opening 21 into the ear canal of the person. An alternative could be to arrange the speakers 13, 14 external to the processor part housing connected with wires to the processor part 2. The speakers could be arranged directly in the ear canal. In another example, also the electrodes could be arranged in the ear canal.

[0051] Even if the first speaker 13 functions well, the sound opening 21, or a sound tube guiding the sound to the ear canal, may be mechanically blocked, thereby blocking the sound. This can also be detected by playing a sound through the first speaker 13 and detecting the sound level reached by the second speaker 14. Sound may be provided through separate sound tubes from each speaker. There should then be a good chance that if one is blocked the other will still be open for sound transmission. Preferably, only one common sound tube is applied.

[0052] The first speaker 13 (or the second speaker 14) May also be applied as microphone for detecting the general background noise level at any time. This can be applied for deciding the sound level of any acoustic information signal or notification, such that it is easily discernible over background noise.

[0053] If the person being monitored does not respond to a notification about a condition of an upcoming biological incidence, such as hypoglycemia or an epileptic attack, the sound level could be increased, and eventually both speakers could be applied for providing the notification in order to obtain the loudest possible acoustical information signal.

[0054] FIG. 3 shows an example of the processor part 2 of a monitor, which is adapted for being arranged external on the skin surface, e.g. behind the ear as illustrated in FIG. 2.

[0055] The housing of the processor part 2 is illustrated with a battery door 22. Also a sound opening 21 is illustrated. A speaker block 20 is arranged inside the housing of the processor part 2 and comprises the two speakers 13, 14. The two speakers could also be arranged as separate units, but building them together as one unit will save space and make manufacturing of the processor part 2 easier.

[0056] Also a pushbutton 26 is illustrated in FIG. 3. The person wearing the monitor may use this button 26 for the acknowledgement that a notification has been heard and e.g. complied with. Such an acknowledgement could also, in some set-ups of the monitor, be provided through an external device (e.g. a mobile phone or a watch) which is wirelessly connected to the monitor. This could be relevant especially when the notification is provided through such an external device.

[0057] The speaker block 20 is connected to the sound outlet 21 through a tubing 25. From the sound outlet 21 the acoustical information signal may be guided into or towards the ear canal of the person being monitored by the use of a sound tube (not shown).

[0058] By having the two speakers connected to the same sound tubing system, and being able to set one receiver up as microphone, it is possible to detect changes in the acoustic impedance of the sound tubing system. Thereby, it will be possible to see if the sound tubing is being filled up with dirt or earwax, and to provide a warning before the sound tubing is completely blocked.

[0059] FIG. 4 shows the example of FIG. 3 with further components shown in the housing of the processor part 2. In addition to the components shown in FIG. 3, FIG. 4 includes a coil 8 for transfer of data and power between the processor part 2 and the electrode part 3. Also, a battery 23 is shown, as well as an electronic circuit 24 comprising the signal processor 4 and possibly also the memory 16 and parts of the radio 15 (see FIG. 1).

[0060] FIG. 5 shows an example of a speaker block 20 with two different speakers 13, 14 placed in close connection and with one common sound outlet 27.

[0061] FIG. 6 shows the speaker block of FIG. 5 seen from a different angle such that the electrical terminals 28, 29, 30, 31 for connecting each speaker 13, 14 with the signal processor 4 become visible.