DE10324763A1 - Dynamic ear protection for inserting in auditory canal has sound proofing with variable adjustment through control signals - Google Patents

Dynamic ear protection for inserting in auditory canal has sound proofing with variable adjustment through control signals Download PDF

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Publication number
DE10324763A1
DE10324763A1 DE2003124763 DE10324763A DE10324763A1 DE 10324763 A1 DE10324763 A1 DE 10324763A1 DE 2003124763 DE2003124763 DE 2003124763 DE 10324763 A DE10324763 A DE 10324763A DE 10324763 A1 DE10324763 A1 DE 10324763A1
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DE
Germany
Prior art keywords
dynamic
control signals
ear
locking
hearing protection
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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.)
Ceased
Application number
DE2003124763
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German (de)
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MR CONFON GmbH
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MR CONFON GmbH
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Publication date
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Priority to DE2003124763 priority Critical patent/DE10324763A1/en
Publication of DE10324763A1 publication Critical patent/DE10324763A1/en
Ceased legal-status Critical Current

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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, e.g. surgical; Protective devices for the ears, carried on the body or in the hand; Non-electric hearing aids
    • A61F11/06Protective devices for the ears
    • A61F11/08Protective devices for the ears internal, e.g. earplugs
    • 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, e.g. surgical; Protective devices for the ears, carried on the body or in the hand; Non-electric hearing aids
    • A61F11/06Protective devices for the ears
    • A61F11/08Protective devices for the ears internal, e.g. earplugs
    • A61F2011/085Protective devices for the ears internal, e.g. earplugs including an inner channel

Abstract

A perforated disk (2b) operates as a sealing mechanism. Its holes are opened/closed by a slide, i.e. an inversely formed disk, rotating on a central axis. Holes at the outer end of a sound canal can be very quickly opened/closed by a disk segment (4) as a sealing mechanism controlled by external control signals, without producing detectable pressure variations in an auditory canal.

Description

  • The The invention relates to a dynamic hearing protection for insertion into the Ear canal in particular for use in magnetic resonance tomography.
  • The Nuclear magnetic resonance or magnetic resonance imaging is a completely side-effect and non invasive medical examination method with an outstanding Soft tissue contrast, as he is by no other imaging techniques can be delivered. These advantages have the investigation method, despite high costs, to a very fast and wide distribution helped. The ever-growing demand both from the field routine diagnostics, as well as from areas of basic research, leads as well to a permanent technical development of the devices and their diagnostic possibilities. Technically, there is a clear trend toward ever faster and ever (magnetic) stronger devices recognizable. This device development is indispensably connected with an ever greater noise development of the devices. For routine devices (1 to 1.5 Tesla field strength) is the noise development already annoying (Sound level up to 110 dB) and leads to investigation aborts. at research equipment and state-of-the-art routine devices (3 Tesla field strength) begins the noise development with sound pressure up to 125 dB problematic. State-of-the-art research equipment (7 Tesla Field strength) - as possible precursor of high performance head scanners for the routine - generate SPL up to 140 dB and can only be used with elaborate damping measures. There are various possibilities, the examination in a magnetic resonance tomograph under acoustic To improve viewpoints has been described.
  • easy and inexpensive, passive measures are routine today. The patient is either given ear plugs or earmuffs placed. With plugs can be - appropriate handling provided - very good Attenuation values over almost reach the entire frequency range. The price / performance ratio is optimal. The disadvantage, however, is the severely limited communication options as well the often described, unpleasant feeling of pressure in the ear. The mechanical Strain along with the lack of air exchange in the sealed ear canal to lead in addition to an increased Probability of ear canal infections.
  • There have been several proposals for solving these problems, completely independent of magnetic resonance imaging ( DE 10117705 A1 . DE 9112815.3 . DE 29902224 U1 ). None of these methods is successfully used today in magnetic resonance imaging. From a psychoacoustic point of view, ear plugs in magnetic resonance imaging are questionable. The - objectively present - reduction of the sound level is subjectively perceived by an increase in the sensitivity of the hearing, and in particular by the very effective in the range of about 1kHz to 4kHz bone conduction, not as pleasant. Together with the severely limited speech understanding, this leads to overwhelming rejection of the pegs by patients and operators.
  • The Combination of protective capsule and headphones provides one - even under psycho-acoustic aspects - very efficient and still inexpensive solution dar. The achievable damping (up to 40dB) corresponds to the very good earplug that becomes communication but not limited but on the contrary, even relieved.
  • additional, passive measures can the noise levels, especially in the range of overtones, further lower. These include the acoustic optimization of the examination room, constructive measures on the MRI machine self and measures to damping of the sound directly in the gradient tunnel of the device. These have passive measures but the disadvantage that the costs increase very quickly. So is e.g. the magnet is the most expensive single component of a magnetic resonance tomograph. A Magnification of the Gradient tunnels to enable passive sound insulation makes the magnet considerably more expensive. This path is therefore of no manufacturer.
  • Active measures to reduce background noise are now also available and are still isolated, but used with increasing success. These measures include the active, partial cancellation of background noise by "anti-sounding." These techniques are characterized by the availability of MRI-compatible microphones ( DE 19835947C2 . EP 1152638 ) and MRI-compatible high-performance loudspeakers ( DE 10018033C1 . DE 19727657 ) and phase-coherent, MRI-compatible headphones ( DE 10251389A1 ) become feasible. Furthermore, it is now possible to partially prevent the generation of background noise by active, piezoelectric ceramics, which are mounted either in the gradient tube or on the sound-radiating cladding elements of the tomograph. Because of the high development effort, active measures are currently even more expensive than passive measures with the same effect. However, they have the potential to enable a reduction or suppression of the low-frequency component of the noise - in the range up to 1000 Hz - by about 20 dB, cost-effective. Due to the ver However, sensors and the previously described algorithms for active cancellation of sound used active methods but fail in impulsive noise with a very low repetition frequency and at Störschallfrequenzen above about 1500 Hz.
  • Two very promising Developments in magnetic resonance imaging, functional magnetic resonance imaging for the determination of brain activity patterns as well as the magnetic resonance spectroscopy for the contactless determination of Metabolic disorders throughout the body are indicated by the currently most unfavorable Form of background noise development at the same time high demands to the communication technology and the possibilities for acoustic Signal presentation for the Patients. Acoustically, these measuring methods are extremely impulsive background noise with basic tones in the range around 1000 Hz and a very low repetition rate of partially labeled below 0.1 Hz. In addition, calls in particular the functional magnetic resonance imaging the trouble-free performance of acoustic Signals between the measuring phases.
  • active Method for sound cancellation are virtually ineffective under these conditions. Passive measures are necessary but not sufficient as a single measure and in the sum of the measures described so far too expensive and not necessarily sufficient.
  • It No method or device has been described so far which alone or in combination with other procedures and Allows devices, the acoustic problems caused by state of the art measuring techniques High and high field MRI scanners arise, sufficient to solve.
  • Of the micro-dynamic hearing protection described here allows for the first time, in combination with proven Protective and presentation techniques, Another significant reduction (up to 30 dB) of background noise completely independently from its impulsiveness and largely independent of its spectral composition. In addition, the bulk of the of earplugs avoided known disadvantages and so in particular communication and presentation of high quality acoustic stimuli as well also adequate ventilation ensured the ear canal.
  • enabled and deactivated the dynamic hearing protection by an external, suitable control as well as an external, suitable drive unit for the many different embodiments are conceivable. These units are not subject to the descriptions below.
  • essential Feature of dynamic hearing protection are the constant alternation between active, that is sound-damping and passive, i. Not sound-absorbing Phase. Essential feature continues, that the change between these phases are done in good time by external control signals, that the chosen one Drive unit the desired soundproofing can set or cancel.
  • Some selected Embodiments are shown in the drawings and are described in more detail below:
  • Embodiment I:
  • Dynamic ear protection with perforated disc 2 B and perforated disc segment 4 as a locking mechanism
  • All Components of dynamic hearing protection are preferably made of materials with a magnetic resonance tomograph compatible are, that means from not or only weakly magnetic and electrically not or only slightly conductive material. Make the drawings only in the ear canal effective part of the hearing protector.
  • The 1a and 1b show the effective part of a preferred embodiment of a dynamic hearing protection in which the locking mechanism 4 , as a disk segment 4 is trained.
  • The dynamic hearing protection described is introduced as an earplug in the ear and here through the housing 2a positively and / or non-positively fastened, made of skin-friendly material sealing lamellae 1 largely air and soundproof stored.
  • At the outer end of the cylindrical housing 2a is a circular disk 2 B attached with two circular openings so positive and positive that between housing 2a and perforated slice 2 B no uncontrolled air exchange can take place.
  • Before an interference sound event occurs, an external, suitable drive unit is activated via an external, suitable control in such a way that the closure mechanism formed here as a disk segment 4 over the drive shaft 5 is twisted until the disc segment 4 the circular openings in the perforated disc 2 B as far as ver concludes that the desired or maximum sound attenuation is achieved. In extreme cases, the segment closes 4 the perforated disc 2 B largely air and soundproof. After the end of the Störschallereignisses the openings are exposed in the same way again as far as it makes the current sound pressure level situation directly at the considered ear required.
  • To improve the effectiveness in extreme situations is between the perforated disc 2 B and the perforated disc segment a seal 2c attached, either firmly on the perforated disc 2 B , on the disk segment 4 or even on both the disk segment 4 as well as on the perforated disc 2 B is applied.
  • The present invention is directed to a closure mechanism that is housed in a housing tailored to an earthing inlet 2a is housed, parked itself. It goes without saying that the invention is accordingly not limited to a disc-shaped locking mechanism described in more detail above, but that any suitable planar and three-dimensional design of the locking mechanism is included. So both in the case 2a located, perforated disc 2 B as well as around the axis 5 rotatably arranged disk segment 4 Also have a width / height / length ratio deviating from the conventional disc-shaped design up or down and / or curved surfaces or even spatially curved, three-dimensional design.
  • A Deviation from the described disk-shaped / disk-segment-shaped geometry, be it for example by curvature or otherwise three-dimensional design of the Verschlussmechanismussees or parts of it optionally the efficiency, but without the functionality in question.
  • Exemplary embodiment II:
  • Dynamic ear protection with perforated cylinder 2 and cylindrical body 2 B as a locking mechanism
  • All Components of dynamic hearing protection are preferably made of materials with a magnetic resonance tomograph compatible are, that means from not or only weakly magnetic and electrically not or only slightly conductive material. Make the drawings only in the ear canal effective part of the hearing protector.
  • The 2a and 2 B show the effective part of a second possible embodiment of a dynamic hearing protection, in which the locking mechanism as a cylinder 3 is trained.
  • The described dynamic hearing protection is introduced like an earplug into the ear and thereby to the housing 2a positively and / or non-positively fastened, made of skin-friendly material sealing lamellae 1 largely air and soundproof stored.
  • At the outer end of the cylindrical housing 2a In the lateral surface preferably two opposing openings are introduced. A second cylindrical body 2 B with two circular openings is fitting so at the outer end of the housing 2a built in that the openings of the cylindrical body 2a and 2 B can be either brought to coincidence by mutual twisting (this condition is in the 2a and 2 B shown) or partially close the openings completely or in the extreme case.
  • A circlip 3 positions the two cylinders axially.
  • When a sound event occurs by external technology - as described in the embodiment I - the locking mechanism formed here as a cylindrical body 2 B over the drive shaft 4 as far as twisted until the outer surface of the cylindrical body 2 B the circular openings in the cylindrical housing 2a so far closes that the given values are reached or in extreme cases the cylinder 2 B the openings in the housing 2a closes largely airtight and then exposes the openings by re-twisting again as far as it makes the current sound pressure level situation directly at the considered ear required.
  • To improve the effectiveness in extreme situations, seals are preferably between the contact surfaces of the cylinders 2c attached, either firmly on the housing interior 2a , on the lateral surface of the cylindrical body 2 B or also on the inside of the housing 2a as well as on the outer shell of the cylindrical body 2 B is applied.

Claims (4)

  1. Dynamic ear protection for insertion into the auditory canal with a variable, adjustable by control signals sound insulation, in particular for use in magnetic resonance imaging, characterized in that in a suitable ear housing for the ear canal, a sound channel is incorporated, the outer end of which has one or more openings, through a controlled by external control signals, shutter mechanism very can be opened or closed quickly without noticeable pressure fluctuations in the ear canal.
  2. Dynamic hearing protection according to claim 1, characterized in that the locking mechanism as a perforated disc whose holes through a centric Axis rotatable / rotatable slide (inversely formed disc) closed and opened can be accomplished is.
  3. Dynamic hearing protection according to claim 1, characterized in that the locking mechanism from two cylindrical bodies which is perpendicular to the major axis with one or more matching openings are provided, which by mutual rotation of the body to cover can be brought.
  4. Dynamic hearing protection according to claim 1, characterized in that the locking mechanism of two mating hollow bodies (e.g. Hollow cone stumps), which on the surface are provided with one or more matching openings, which be brought to coincidence by mutual twisting of the body can.
DE2003124763 2003-06-01 2003-06-01 Dynamic ear protection for inserting in auditory canal has sound proofing with variable adjustment through control signals Ceased DE10324763A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE2003124763 DE10324763A1 (en) 2003-06-01 2003-06-01 Dynamic ear protection for inserting in auditory canal has sound proofing with variable adjustment through control signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2003124763 DE10324763A1 (en) 2003-06-01 2003-06-01 Dynamic ear protection for inserting in auditory canal has sound proofing with variable adjustment through control signals

Publications (1)

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DE10324763A1 true DE10324763A1 (en) 2005-01-27

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009086649A1 (en) * 2008-01-11 2009-07-16 Awengen Daniel F Variable hearing protection
US8103014B2 (en) 2008-02-15 2012-01-24 Siemens Aktiengesellschaft Hearing protector for use in magnetic resonance systems
CN103919647A (en) * 2014-04-11 2014-07-16 东南大学 Noise reduction earplug capable of being automatically separated from ear canal at regular time

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29902224U1 (en) * 1999-02-08 1999-04-22 Merlaku Kastriot Ventilation system for headphones or hearing protection devices
WO1999036016A1 (en) * 1998-01-19 1999-07-22 Simply Silence Simsin B.V. Hearing protector
EP0955025A1 (en) * 1998-04-29 1999-11-10 Cabot Safety Intermediate Corporation Selective nonlinear attenuating earplug
US6082485A (en) * 1999-08-10 2000-07-04 Smith; Eric B. Adjustable earplug
EP1078615A1 (en) * 1999-08-19 2001-02-28 Kurer, Walter Hearing protector

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999036016A1 (en) * 1998-01-19 1999-07-22 Simply Silence Simsin B.V. Hearing protector
EP0955025A1 (en) * 1998-04-29 1999-11-10 Cabot Safety Intermediate Corporation Selective nonlinear attenuating earplug
DE29902224U1 (en) * 1999-02-08 1999-04-22 Merlaku Kastriot Ventilation system for headphones or hearing protection devices
US6082485A (en) * 1999-08-10 2000-07-04 Smith; Eric B. Adjustable earplug
EP1078615A1 (en) * 1999-08-19 2001-02-28 Kurer, Walter Hearing protector

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009086649A1 (en) * 2008-01-11 2009-07-16 Awengen Daniel F Variable hearing protection
DE212009000011U1 (en) 2008-01-11 2010-08-05 Awengen, Daniel F. Variable hearing protection
US8103014B2 (en) 2008-02-15 2012-01-24 Siemens Aktiengesellschaft Hearing protector for use in magnetic resonance systems
DE102008037818B4 (en) * 2008-02-15 2014-04-30 Siemens Aktiengesellschaft Hearing protection for use in magnetic resonance systems
CN103919647A (en) * 2014-04-11 2014-07-16 东南大学 Noise reduction earplug capable of being automatically separated from ear canal at regular time

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8122 Nonbinding interest in granting licenses declared
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