Methods and devices for attenuating sound in a conduit or chamber
Occlusion devices, earpiece devices and methods of forming occlusion devices are provided. An occlusion device is configured to occlude an ear canal, but other biological and non-biological conduits or chambers can be occluded using the devices and methods herein. The occlusion device includes an insertion element and at least one occluding member or element (which can be expandable) disposed on the insertion element. The occluding member is configured to receive a medium via the insertion element and is configured to expand, responsive to the medium, to contact the ear canal. Alternatively, the occluding member is made of a non-Newtonian fluid and can be enclosed by a balloon or not. Physical parameters of the occlusion device are selected to produce a predetermined sound attenuation characteristic over a frequency band. Use of a non-Newtonian fluid provides additional options or variables in customizing or designing a predetermined sound attenuation characteristic.
1. A method of attenuating sound from one end of a chamber or conduit to another end of the chamber or conduit, comprising:
occluding an open-ended conduit with a multi chamber flexible element, where the multi chamber flexible element has at least a first and second chamber, wherein the first and second chambers are formed by placing an o-ring positioned along a length of a single balloon, wherein the first chamber is on an opposite side of the o-ring from the second chamber;
low pass filtering a first acoustic signal, where the low pass filtering of the acoustic signal occurs as it passes through the first chamber forming a first filtered signal; and
high pass filtering the first filtered signal, where the high pass filtering of the first filtered signal occurs as it passes through the second chamber forming a final transmitted acoustic signal.
2. The method of claim 1 , wherein the first chamber encompasses a first medium and the second chamber encompasses a second medium.
3. The method according to claim 2 , where the first medium is a liquid.
4. The method according to claim 3 , where the second medium is a gas.
5. The method according to claim 4 , where the final transmitted acoustic signal is flat, where flat is defined as the frequency dependent transmission in dB, from 100 Hz to 5000 Hz, lying with +/− 10 dB of a mean transmission value.
6. The method according to claim 5 , where the first chamber is formed by a flexible membrane.
7. The method according to claim 6 , where the second chamber is formed by a flexible membrane.
8. The method according to claim 7 , where the first medium is a non Newtonian fluid.
9. The method according to claim 8 , wherein the non-Newtonian fluid comprises carrier liquid and rigid colloidal particles.
10. The method according to claim 9 , wherein the non-Newtonian fluid comprises carrier fluid selected from the group of water, ethylene glycol (EG) and the non-Newtonian fluid further comprises particles selected from the group comprising silica, titanium, oxide, calcium carbonate, cornstarch, synthetically occurring minerals, naturally occurring minerals, polymers, or a mixture of any of the aforementioned particles.
11. A sound occluding system, comprising:
an occluding element, where the occluding element includes a first chamber and a second chamber, wherein the first and second chambers are formed by placing an o-ring positioned along a length of a single balloon, wherein the first chamber is on an opposite side of the o-ring from the second chamber, where the occluding element is configured to be placed within a channel to acoustically occlude the channel, where the first chamber acts as a low pass filtering to a first acoustic signal, where the low pass filtering of the first acoustic signal occurs as it passes through the first chamber forming a first filtered signal and where the second chamber acts as a high pass filtering to the first filtered signal, where the high pass filtering of the first filtered signal occurs as it passes through the second chamber forming a final transmitted acoustic signal.
12. The method of claim 11 , wherein the first chamber encompasses a first medium and the second chamber encompasses a second medium.
13. The method according to claim 12 , where the first medium is a liquid.
14. The method according to claim 13 , where the second medium is a gas.
15. The method according to claim 14 , where the final transmitted acoustic signal is flat, where flat is defined as the frequency dependent transmission in dB, from 100 Hz to 5000 Hz, lying with +/− 10 dB of a mean transmission value.
16. The method according to claim 15 , where the first chamber is formed by a flexible membrane.
17. The method according to claim 16 , where the second chamber is formed by a flexible membrane.
18. The method according to claim 17 , where the first medium is a non Newtonian fluid.
19. The method according to claim 18 , wherein the non-Newtonian fluid comprises carrier liquid and rigid colloidal particles.
20. The method according to claim 19 , wherein the non-Newtonian fluid comprises carrier fluid selected from the group of water, ethylene glycol (EG) and the non-Newtonian fluid further comprises particles selected from the group comprising silica, titanium, oxide, calcium carbonate, cornstarch, synthetically occurring minerals, naturally occurring minerals, polymers, or a mixture of any of the aforementioned particles.