A Novel Method to Determine Standardized Anatomic Dimensions of the Osseous External Auditory Canal

Mahboubi, Hossein; Wu, Edward C.; Jahanbakhshi, Reza; Coale, Kristina; Rothholtz, Vanessa S.; Zardouz, Shawn; Djalilian, Hamid R.

doi:10.1097/mao.0b013e3182544e55

Cited by 16 publications

(19 citation statements)

References 8 publications

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“…The shape of the osseous external auditory canal (OEAC) has often been suggested in literature to be an etiologic factor in (C)OE (3,5Y9). Although several classifications of the shape of the OEAC have been proposed (10,11), no attempt to correlate a certain classification to pathology has been published to date. Clinical observations suggest that certain shapes are likely to be involved in the development of a chronic inflammation as they hamper proper cleaning of the OEAC.…”

mentioning

confidence: 98%

The Shape of the Osseous External Auditory Canal and Its Relationship to Chronic External Otitis

Spronsen

Geerse²,

Mirck³

et al. 2014

Otology &Amp; Neurotology

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mentioning

confidence: 98%

The Shape of the Osseous External Auditory Canal and Its Relationship to Chronic External Otitis

Spronsen

Geerse²,

Mirck³

et al. 2014

Otology &Amp; Neurotology

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“…Pain, irritation, keratin and moisture build up may occur [6]. In addition, various shapes and curvature of the bony canal may limit deep insertion of the devices [24]. It has been reported that 18% of the Lyric hearing aid users reported pain in the ear, irritation in the ear canal, and occlusion or a build-up of moisture between the hearing aid and the eardrum [25].…”

Section: Discussionmentioning

confidence: 99%

Investigation of a Novel Completely-in-the-Canal Direct-Drive Hearing Device

Mahboubi¹,

Paulick²,

Kiumehr³

et al. 2013

Otology &Amp; Neurotology

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Hypothesis Whether a prototype direct-drive hearing device (DHD) is effective in driving the tympanic membrane (TM) in a temporal bone specimen to enable it to potentially treat moderate to severe hearing loss. Background Patient satisfaction with air conduction hearing aids has been low due to sound distortion, occlusion effect, and feedback issues. Implantable hearing aids provide a higher quality sound, but require surgery for placement. The DHD was designed to combine the ability of driving the ossicular chain with placement in the external auditory canal. Methods DHD is a 3.5 mm wide device that could fit entirely into the bony ear canal and directly drive the TM rather than use a speaker. A cadaveric temporal bone was prepared. The device developed in our laboratory was coupled to the external surface of the TM and against the malleus. Frequency sweeps between 300 Hz to 12 kHz were performed in two different coupling methods at 104 and 120 dB, and the DHD was driven with various levels of current. Displacements of the posterior crus of the stapes were measured using a Laser Doppler Vibrometer. Results The DHD showed a linear frequency response from 300Hz to 12kHz. Placement against the malleus showed higher amplitudes and lower power requirements than when the device was placed on the TM. Conclusions DHD is a small completely-in-the-canal device that mechanically drives the TM. This novel device has a frequency output wider than most air conduction devices. Findings of the current study demonstrated that the DHD had the potential of being incorporated into a hearing aid in the future.

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“…However, the relationship between COM and acquired canal stenosis has rarely been mentioned in the literature in the last 15 years. 1,5 The human EAC is composed of 2 portions-the cartilaginous and the osseous part. In most otolaryngology texts, the osseous external auditory canal (OEAC) is described as located in the medial two-thirds of EAC, and its anatomic feature can be evaluated clearly by high-resolution computed tomography (HRCT).…”

Section: Introductionmentioning

confidence: 99%

“…[6][7] In 2012, Mahboubi introduced a standard and objective method to determine the anatomic dimension of OEAC. 5 In this study, we try to figure out whether the dimension of OEAC or the shape of OEAC was related to COM.…”

Section: Introductionmentioning

confidence: 99%

A Retrospective Study to Identify the Relationship Between the Dimension of Osseous External Auditory Canal and Chronic Otitis Media

et al. 2019

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Whether the dimension of the osseous external auditory canal (OEAC) is related to chronic otitis media (COM) remains an important but unresolved issue. In the literature, routine canaloplasty has been suggested to help elucidate this problem. In this study, we intended to investigate the relationship between the diameter or shape of OEAC and COM. We retrospectively reviewed the high-resolution computed tomography (HRCT) images of the temporal bones of 62 patients with unilateral COM who underwent tympanoplasty from January 1, 2011, to December 31, 2013. For comparison, the HRCT images of another 62 patients with normal ears were collected to be the control group. The shape of OEAC was categorized into 5 groups according to Mahboubi’s classification, and the dimension of each patient’s OEAC was measured at 2 defined sections (annular section and isthmus/midcanal section). The most prevalent shape of OEAC for the lesion sides of the ears was cylindrical, followed by conical, and hourglass in both the COM and the control groups. As to the dimension of OEAC, there were no significant differences between lesion ears and normal ears among patients in the COM group as well as between lesion ears in the COM group and normal ears in the control group. We concluded that the bony dimension of the external ear canal was not related to COM. This suggested that chronic inflammation or infection of middle ear may not cause bony thickening of OEAC, despite the kind of OEAC shape involved.

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A Novel Method to Determine Standardized Anatomic Dimensions of the Osseous External Auditory Canal

Abstract: Standardized anatomic dimensions of the OEAC provide important measurements for design of novel in-the-canal hearing aids and specialized earplugs and assist in defining average sizes for canalplasty procedures.

Cited by 16 publications

References 8 publications

The Shape of the Osseous External Auditory Canal and Its Relationship to Chronic External Otitis

The Shape of the Osseous External Auditory Canal and Its Relationship to Chronic External Otitis

Investigation of a Novel Completely-in-the-Canal Direct-Drive Hearing Device

A Retrospective Study to Identify the Relationship Between the Dimension of Osseous External Auditory Canal and Chronic Otitis Media

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