JPH07100163A - Earplug - Google Patents

Earplug

Info

Publication number
JPH07100163A
JPH07100163A JP25081293A JP25081293A JPH07100163A JP H07100163 A JPH07100163 A JP H07100163A JP 25081293 A JP25081293 A JP 25081293A JP 25081293 A JP25081293 A JP 25081293A JP H07100163 A JPH07100163 A JP H07100163A
Authority
JP
Japan
Prior art keywords
air
earplug
adjusting
permeable member
air permeable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP25081293A
Other languages
Japanese (ja)
Inventor
Shusuke Hashimoto
修左 橋本
Yoshinobu Suzuki
良延 鈴木
Takamasa Kikuchi
孝真 菊地
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shimizu Construction Co Ltd
Shimizu Corp
Original Assignee
Shimizu Construction Co Ltd
Shimizu Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shimizu Construction Co Ltd, Shimizu Corp filed Critical Shimizu Construction Co Ltd
Priority to JP25081293A priority Critical patent/JPH07100163A/en
Publication of JPH07100163A publication Critical patent/JPH07100163A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F11/00Methods or devices for treatment of the ears or hearing sense; Non-electric hearing aids; Methods or devices for enabling ear patients to achieve auditory perception through physiological senses other than hearing sense; Protective devices for the ears, carried on the body or in the hand
    • A61F11/06Protective devices for the ears
    • A61F11/08Protective devices for the ears internal, e.g. earplugs

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Acoustics & Sound (AREA)
  • Biophysics (AREA)
  • Otolaryngology (AREA)
  • Psychology (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Materials For Medical Uses (AREA)

Abstract

PURPOSE:To provide an earplug which can prevent the rupture of the eardrum or an aero-otitis media when an elevator operates at a normal moving speed or an airplane takes off and lands. CONSTITUTION:A cylindrical earplug main body 2 having an elasticity and an air penetrating member 4 which is arranged so as to partition a hollow section 3 of the earplug main body and which limits a flow of air flowing from one side to the other side are provided. It is preferable to provide adjusting means for adjusting the air flow through the air penetrating member. It is preferable that the adjusting means adjusts the air flow by adjusting an air penetration resistance of the air penetrating member or by adjusting an effective area of the air penetrating member. It is also preferable that the air penetrating member is a film on which pores are innumerably formed, a sintered member obtained by sintering grains, or a plate on which holes or slits are formed.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、例えば、超高層建築に
おけるエレベータ移動時や、航空機による離着陸時に生
ずる急激な気圧変化による鼓膜破裂事故や航空性中耳炎
を防止するために使用される耳栓に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to earplugs used to prevent eardrum rupture accidents and aerial otitis media due to sudden changes in atmospheric pressure that occur during elevator movements in super high-rise buildings or during takeoff and landing by aircraft. .

【0002】[0002]

【従来の技術】ところで、超高層建築におけるエレベー
タ移動時や、航空機による離着陸時に生ずる急激な気圧
変化により利用者の鼓膜破裂事故や航空性中耳炎が発症
することがある。
2. Description of the Related Art By the way, a sudden tympanic pressure change that occurs when an elevator moves in a skyscraper or when an aircraft takes off and takes off may cause a tympanic membrane rupture accident of a user or aerial otitis media.

【0003】本願出願人は、超高層建築におけるエレベ
ータ移動が搭乗者の耳に及ぼす影響について実験・検討
したところ、耳管の完全閉塞者であって、鼓膜・中耳腔
の機能異常を同時にもっている特異体質者の場合に最も
鼓膜破壊の危険性が高いことが判明している。耳管が閉
塞している特異体質者は、約1割という高い確率で存在
することが明らかになっており、その中でも鼓膜の弱い
者に鼓膜破裂事故や航空性中耳炎などが起こると推定さ
れる。
The applicant of the present application has conducted experiments and studies on the influence of elevator movement in a skyscraper on the ears of passengers. As a result, he is a person with complete obstruction of the Eustachian tube and has abnormal tympanic membrane and middle ear cavity functions at the same time. It has been found that the risk of eardrum destruction is the highest for those who have a specific constitution. It is known that there is a high probability that about 10% of people have a specific constitution in which the Eustachian tube is occluded. Among them, it is presumed that a person with a weak eardrum may experience a tympanic membrane rupture accident or aerial otitis media. .

【0004】そこで、鼓膜破壊の危険を回避するために
は、エレベータの移動速度を遅くすることで気圧変化の
勾配を小さくする対策や、エレベータの移動速度はその
ままでエレベータ内の気圧を時間をかけて高層階の気圧
に調整する対策を採ることが考えられる。
Therefore, in order to avoid the risk of eardrum destruction, measures are taken to reduce the gradient of atmospheric pressure change by slowing down the moving speed of the elevator, or the atmospheric pressure inside the elevator is increased over time while the moving speed of the elevator remains unchanged. It may be possible to take measures to adjust the pressure to higher floors.

【0005】[0005]

【発明が解決しようとする課題】しかしながら、エレベ
ータの移動速度を遅くする対策では、エレベータの運行
速度が低下するので、運送効率が低下するとともに、利
用者に心理的な影響(例えば、不安感)を与える等の問
題がある。
However, as a measure for slowing down the moving speed of the elevator, the operating speed of the elevator is lowered, so that the transportation efficiency is lowered and the user is psychologically affected (for example, anxiety). There is a problem such as giving.

【0006】また、エレベータ内の気圧を調整するもの
では、エレベータが目的階に到達した後、低速で移動し
たのと同程度の相当時間をかけて高層階の気圧に調整す
るので、その間の時間はエレベータ内に留まらなければ
ならず、前記と同様に、運送効率が低下する等の問題が
発生する。
In the case of adjusting the atmospheric pressure in the elevator, after the elevator reaches the destination floor, it takes the same amount of time as if it moved at a low speed to adjust the atmospheric pressure in the higher floors. Must stay in the elevator, and similarly to the above, there arises a problem such as a reduction in transportation efficiency.

【0007】本発明は、上記事情に鑑みてなされたもの
で、エレベータの移動速度を通常の速度で運行させた場
合や航空機の離着陸の場合に、鼓膜破裂事故や航空性中
耳炎が発症することを未然に防止することができる耳栓
を提供することを目的とする。
The present invention has been made in view of the above circumstances, and it is known that a tympanic membrane rupture accident or aerial otitis media develops when the elevator is operated at a normal speed or when the aircraft is taking off and landing. An object is to provide an earplug that can be prevented in advance.

【0008】[0008]

【課題を解決するための手段】本発明の請求項1記載の
耳栓は、弾力性を有する筒状の耳栓本体と、この耳栓本
体の中空部を仕切って設置され、一方側から他方側への
空気の流通速度を制限する空気透過部材とを備えたこと
を特徴とする。
The earplug according to claim 1 of the present invention is installed by partitioning a tubular earplug main body having elasticity and a hollow portion of the earplug main body from one side to the other. And an air permeable member for limiting the flow rate of air to the side.

【0009】本発明の請求項2記載の耳栓は、請求項1
記載の耳栓において、前記空気透過部材の空気の流通量
を調整する調整手段が設けられていることを特徴とす
る。
The earplug according to claim 2 of the present invention is the earplug according to claim 1.
The earplug described above is characterized in that adjustment means for adjusting the flow rate of the air through the air permeable member is provided.

【0010】なお、前記空気透過部材が細孔が無数に形
成された膜材であることが好ましい。また、空気透過部
材が細粒を焼結した焼結材であることが好ましい。ま
た、空気透過部材が、孔あるいはスリットが形成された
板材であることが好ましい。
It is preferable that the air permeable member is a film material having innumerable pores. Further, the air permeable member is preferably a sintered material obtained by sintering fine particles. Further, it is preferable that the air permeable member is a plate member having holes or slits formed therein.

【0011】また、前記調整手段が空気透過部材の空気
の透過抵抗を調整することにより空気の流通量を調整す
るものであることが好ましい。また、調整手段が空気透
過部材の有効面積を調整することにより空気の流通量を
調整するものであることが好ましい。
Further, it is preferable that the adjusting means adjusts the flow rate of the air by adjusting the permeation resistance of the air of the air permeable member. Further, it is preferable that the adjusting means adjusts the flow rate of air by adjusting the effective area of the air permeable member.

【0012】[0012]

【作用】本発明の請求項1記載の耳栓によれば、エレベ
ータの上昇や航空機の離陸時に前記耳栓を装着している
と、上昇や離陸時に耳栓の外の外気圧は急激に変化する
が、耳栓の内側と外側は空気透過部材により仕切られて
いるので、耳栓の内側の圧力は移動前の気圧が保たれ
る。そして、ここで生じた気圧差により空気透過部材を
通してゆっくりと空気が移動することにより鼓膜への急
激な圧力負担が緩衝される。そして、耳栓の内側の気圧
が外気圧と平衡した時点で、耳栓を取り外す。このよう
に、本発明の耳栓を装着することで鼓膜に対する急激な
圧力負担を緩衝することができ、鼓膜破壊や航空性中耳
炎などの圧損傷を未然に防止することができる。
According to the earplug according to the first aspect of the present invention, when the earplug is attached when the elevator is raised or the aircraft is taking off, the external pressure outside the earplug suddenly changes when the elevator is raised or taken off. However, since the inside and outside of the earplug are partitioned by the air permeable member, the pressure inside the earplug is maintained at the atmospheric pressure before the movement. Then, due to the atmospheric pressure difference generated here, the air slowly moves through the air permeable member, so that a sudden pressure load on the eardrum is buffered. Then, when the air pressure inside the earplugs is balanced with the outside air pressure, the earplugs are removed. As described above, by mounting the earplug of the present invention, it is possible to buffer a sudden pressure load on the eardrum, and prevent pressure damage such as eardrum destruction and aerial otitis media.

【0013】本発明の請求項2記載の耳栓によれば、調
整手段により空気透過部材の空気の流通量を調整するよ
うにしているので、耳管の調圧機能や鼓膜の強さに対す
る個人差に対応して、空気透過部材の透過抵抗や有効断
面積を調整することができ、使用者の個人差に適した性
能をもたせることができる。
According to the earplug according to the second aspect of the present invention, the amount of air flowing through the air permeable member is adjusted by the adjusting means, so that the individual can adjust the pressure adjusting function of the ear canal and the strength of the eardrum. The permeation resistance and effective cross-sectional area of the air permeable member can be adjusted according to the difference, and performance suitable for the individual difference of the user can be provided.

【0014】[0014]

【実施例】以下に、図面を参照して、本発明の一実施例
の耳栓について説明する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS An earplug according to an embodiment of the present invention will be described below with reference to the drawings.

【0015】本実施例の耳栓1は、図1に示すように、
弾力性を有する例えばシリコンゴムからなる筒状の耳栓
本体2と、この耳栓本体2の中空部3を仕切って設置さ
れ、一方側3aから他方側3bへの空気の流通速度を制
限する(両面の圧力差によりきわめてゆっくりと空気を
透過する)空気透過部材4と、この空気透過部材4を両
面から挟むように配置された網状部材5,6を備えてい
る。耳栓本体2の外形は耳管内に挿入したときに耳管内
面に密着するように鍔部2aが形成された外形となって
いる。
As shown in FIG. 1, the earplug 1 of this embodiment has the following structure.
A cylindrical earplug body 2 made of, for example, silicone rubber having elasticity and a hollow portion 3 of the earplug body 2 are installed so as to partition the air flow rate from one side 3a to the other side 3b ( An air permeable member 4 that allows air to permeate very slowly due to a pressure difference between the two surfaces, and mesh members 5 and 6 arranged so as to sandwich the air permeable member 4 from both sides. The outer shape of the earplug main body 2 is an outer shape in which the collar portion 2a is formed so as to be in close contact with the inner surface of the ear canal when inserted into the ear canal.

【0016】前記空気透過部材4の材質としては、数μ
m〜数百μmの多数の孔を有するポリカーボモネート膜
を使用することが好ましい。この他に、空気透過部材4
の材質としては、細粒を焼結した焼結材であっても、孔
あるいはスリットが形成された板材であってもよい。
The material of the air permeable member 4 is several μm.
It is preferable to use a polycarbonate membrane having a large number of pores of m to several hundreds of μm. In addition to this, the air permeable member 4
The material may be a sintered material obtained by sintering fine particles, or a plate material having holes or slits formed therein.

【0017】次に、本発明の耳栓1の作用について説明
する。エレベータの上昇や航空機の離陸時に耳栓1を装
着していると、上昇や離陸時に耳栓1の外の外気圧は急
激に変化するが、耳栓1の内側と外側は空気透過部材4
により仕切られているので、耳栓の内側の圧力は移動前
の気圧が保たれる。そして、ここで生じた気圧差により
空気透過部材4を通してゆっくりと空気が移動すること
により鼓膜7への急激な圧力負担が緩衝される。そし
て、耳栓1の内側の気圧が外気圧と平衡した時点で、耳
栓1を取り外す。このように、本発明の耳栓1を装着す
ることで鼓膜7に対する急激な圧力負担を緩衝すること
ができ、鼓膜破壊や航空性中耳炎などの圧損傷を未然に
防止することができる。
Next, the operation of the earplug 1 of the present invention will be described. If the earplugs 1 are attached when the elevator is lifted or the aircraft is taken off, the outside air pressure outside the earplugs 1 changes rapidly when the elevator is lifted or taken off, but the inside and outside of the earplugs 1 are air permeable members 4
Since it is partitioned by, the pressure inside the earplugs is maintained at the atmospheric pressure before the movement. Then, due to the atmospheric pressure difference generated here, the air slowly moves through the air permeable member 4, and the sudden pressure load on the eardrum 7 is buffered. Then, when the atmospheric pressure inside the earplug 1 is balanced with the external atmospheric pressure, the earplug 1 is removed. As described above, by mounting the earplug 1 of the present invention, it is possible to buffer a sudden pressure load on the eardrum 7 and prevent pressure damage such as tympanic membrane destruction and aerial otitis media.

【0018】また、前記実施例の耳栓1によれば、空気
透過部材4は極めて薄いものであるが、この空気透過部
材4の両面に配置された網状部材5,6により挟まれて
いるので、しわになったり、折れ曲がったりすることが
なく好適である。さらに、空気透過部材4を網状部材
5,6で挟んであるので、環境音をわずかな損失で透過
させることができ、耳栓1を装着することにより環境音
が聞こえなくなることがない。
According to the earplug 1 of the above embodiment, the air permeable member 4 is extremely thin, but it is sandwiched by the mesh members 5 and 6 arranged on both sides of the air permeable member 4. It is suitable because it does not wrinkle or bend. Further, since the air permeable member 4 is sandwiched between the mesh members 5 and 6, the environmental sound can be transmitted with a slight loss, and the environmental sound can be heard by wearing the earplug 1.

【0019】なお、前記耳栓1に、空気透過部材4の空
気の流通量を調整する調整手段を設けるようにしてもよ
い。この場合は、この調整手段が空気透過部材の空気の
透過抵抗を調整することにより空気の流通量を調整する
ものや、空気透過部材の有効面積を調整することにより
空気の流通量を調整するものが好ましい。
The earplug 1 may be provided with an adjusting means for adjusting the amount of air flowing through the air permeable member 4. In this case, the adjusting means adjusts the air flow rate by adjusting the air permeation resistance of the air permeable member, or the air flow rate by adjusting the effective area of the air permeable member. Is preferred.

【0020】このものでは、耳管の調圧機能や鼓膜の強
さに対する個人差に対応して、空気透過部材の透過抵抗
や有効断面積を調整することができ、使用者の個人差に
適した性能をもたせることができる。
With this device, the permeation resistance and the effective cross-sectional area of the air permeable member can be adjusted according to the individual differences in the pressure control function of the Eustachian tube and the strength of the eardrum, which is suitable for individual differences of users. It can have excellent performance.

【0021】また、数段階の空気透過抵抗を有する複数
の空気透過部材4を用いて複数の耳栓1を製作してお
き、使用者がこれらの耳栓1のうちで適当なものを選択
して使用することができるようにしてもよい。
Further, a plurality of earplugs 1 are manufactured by using a plurality of air permeable members 4 having several levels of air permeation resistance, and a user selects an appropriate one from these earplugs 1. You may make it possible to use it.

【0022】[0022]

【発明の効果】以上説明したように、本発明の請求項1
記載の耳栓によれば、弾力性を有する筒状の耳栓本体
と、この耳栓本体の中空部を仕切って設置され、一方側
から他方側への空気の流通速度を制限する空気透過部材
とを備えたので、この耳栓を装着することで鼓膜に対す
る急激な圧力負担を緩衝することができ、鼓膜破壊や航
空性中耳炎などの圧損傷を未然に防止することができ
る。
As described above, according to the first aspect of the present invention.
According to the earplug described, the tubular earplug body having elasticity and the air permeable member for partitioning the hollow portion of the earplug body to limit the flow velocity of air from one side to the other side. Since the earplug is attached, it is possible to buffer a sudden pressure load on the eardrum and prevent pressure damage such as eardrum destruction and aerial otitis media.

【0023】本発明の請求項2記載の耳栓によれば、請
求項1記載の耳栓において、前記空気透過部材の空気の
流通量を調整する調整手段が設けられているので、請求
項1記載の耳栓と同様な効果を発揮するとともに、耳管
の調圧機能や鼓膜の強さに対する個人差に対応して、空
気透過部材の透過抵抗や有効断面積を調整することがで
き、使用者の個人差に適した性能をもたせることができ
る。
According to the earplug of the second aspect of the present invention, the earplug of the first aspect is provided with adjusting means for adjusting the flow rate of the air in the air permeable member. In addition to exhibiting the same effects as the earplugs described, it is possible to adjust the permeation resistance and effective cross-sectional area of the air-permeable member according to the individual differences in the pressure regulation function of the Eustachian tube and the strength of the eardrum. It is possible to provide performance suitable for individual differences among persons.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例の耳栓を示す図である。FIG. 1 is a diagram showing an earplug according to an embodiment of the present invention.

【図2】図1の耳栓を装着した状態を示す図である。FIG. 2 is a view showing a state where the earplug of FIG. 1 is attached.

【符号の説明】[Explanation of symbols]

1 耳栓 2 耳栓本体 3 中空部 4 空気透過部材 5,6 網状部材 1 Earplug 2 Earplug body 3 Hollow part 4 Air permeable member 5,6 Net member

Claims (7)

【特許請求の範囲】[Claims] 【請求項1】 弾力性を有する筒状の耳栓本体と、この
耳栓本体の中空部を仕切って設置され、一方側から他方
側への空気の流通速度を制限する空気透過部材とを備え
たことを特徴とする耳栓。
1. An earplug main body having elasticity, and an air permeable member which is installed by partitioning a hollow portion of the earplug main body and which restricts a flow velocity of air from one side to the other side. Ear plugs characterized by that.
【請求項2】 前記空気透過部材の空気の流通量を調整
する調整手段が設けられていることを特徴とする請求項
1記載の耳栓。
2. The earplug according to claim 1, further comprising adjusting means for adjusting an amount of air flowing through the air permeable member.
【請求項3】 前記空気透過部材が細孔が無数に形成さ
れた膜材であることを特徴とする請求項1又は2記載の
耳栓。
3. The earplug according to claim 1, wherein the air permeable member is a film material having innumerable pores.
【請求項4】 前記空気透過部材が細粒を焼結した焼結
材であることを特徴とする請求項1又は2記載の耳栓。
4. The earplug according to claim 1, wherein the air permeable member is a sintered material obtained by sintering fine particles.
【請求項5】 前記空気透過部材が、孔あるいはスリッ
トが形成された板材であることを特徴とする請求項1又
は2記載の耳栓。
5. The earplug according to claim 1, wherein the air permeable member is a plate member having holes or slits formed therein.
【請求項6】 前記調整手段が空気透過部材の空気の透
過抵抗を調整することにより空気の流通量を調整するも
のであることを特徴とする請求項2記載の耳栓。
6. The earplug according to claim 2, wherein the adjusting means adjusts the flow rate of air by adjusting the air permeation resistance of the air permeation member.
【請求項7】 前記調整手段が空気透過部材の有効面積
を調整することにより空気の流通量を調整するものであ
ることを特徴とする請求項2記載の耳栓。
7. The earplug according to claim 2, wherein the adjusting means adjusts the flow rate of air by adjusting the effective area of the air permeable member.
JP25081293A 1993-10-06 1993-10-06 Earplug Withdrawn JPH07100163A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25081293A JPH07100163A (en) 1993-10-06 1993-10-06 Earplug

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25081293A JPH07100163A (en) 1993-10-06 1993-10-06 Earplug

Publications (1)

Publication Number Publication Date
JPH07100163A true JPH07100163A (en) 1995-04-18

Family

ID=17213419

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25081293A Withdrawn JPH07100163A (en) 1993-10-06 1993-10-06 Earplug

Country Status (1)

Country Link
JP (1) JPH07100163A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011041818A (en) * 2009-11-01 2011-03-03 Shinichi Koyano Ear plug with water repellent function having normal hearing function even when attached with
JP2013229728A (en) * 2012-04-25 2013-11-07 Jvc Kenwood Corp Earpiece and headphone
WO2015115322A1 (en) * 2014-01-29 2015-08-06 Dkshジャパン株式会社 Ear plug

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011041818A (en) * 2009-11-01 2011-03-03 Shinichi Koyano Ear plug with water repellent function having normal hearing function even when attached with
JP2013229728A (en) * 2012-04-25 2013-11-07 Jvc Kenwood Corp Earpiece and headphone
WO2015115322A1 (en) * 2014-01-29 2015-08-06 Dkshジャパン株式会社 Ear plug

Similar Documents

Publication Publication Date Title
US5819745A (en) Pressure-regulating ear plug
EP0862398B1 (en) Pressure-regulating ear plug
US5467784A (en) Pressure-regulating ear plug
DE69521942T2 (en) Supra-ear headphones for active noise reduction
WO1997018779A9 (en) Pressure-regulating ear plug
KR101025786B1 (en) Earphones with barometric pressure control
US3154171A (en) Noise suppressing filter for microphone
US20040163882A1 (en) Pressure regulating earplug
CN110351625B (en) A kind of physical noise reduction device, method and application based on vent valve
US20170105876A1 (en) Headache relief earplug
US2933086A (en) Fluid filled ear muffs
Pääkkönen et al. Active noise reduction in aviation helmets during a military jet trainer test flight
JP2000201964A (en) Waterproof earplug
Campbell XXVIII Otolaryngological Problems of Aviation in World War II
CN211156676U (en) A multifunctional earplug
JP3366754B2 (en) Hearing aid worn on ear and manufacturing method thereof
JP2024173519A (en) Airplane earplugs
WO2015115322A1 (en) Ear plug
JPH0240972Y2 (en)
ERSNER et al. Speech hearing in otosclerosis
US20060090763A1 (en) Disposable ear plug
CN105012074A (en) Earplugs
CN120000422A (en) A microporous pressure-relieving earplug and its application
KR20230138235A (en) An Earplug with a Function of Blocking a Noise and Regulating a Pressure
Casto et al. Effect of Communications Headset, Hearing Ability, Flight Workload, and Communications Signal Quality on Pilot Performance in an Army Black Hawk Helicopter Simulator

Legal Events

Date Code Title Description
A300 Withdrawal of application because of no request for examination

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 20001226