scholarly journals 3D models related to the publication: Early Evolution of the Ossicular Chain in Cetacea: Into the Middle Ear Gears of a Semi-Aquatic Protocetid Whale

MorphoMuseuM ◽  
2019 ◽  
Vol 5 (4) ◽  
pp. e94
Author(s):  
Mickaël Mourlam ◽  
Maëva J Orliac
Keyword(s):  
Middle Ear ◽  
Ossicular Chain ◽  
3D Models ◽  
Early Evolution

Ossicular chain reconstruction: endoscopic or microscopic?

2021 ◽  
pp. 1-7
Author(s):  
E A Guneri ◽  
A Cakir Cetin
Keyword(s):  
Word Recognition ◽  
Middle Ear ◽  
Risk Index ◽  
Ossicular Chain ◽  
Recognition Score ◽  
Reconstruction Surgery ◽  
Ossicular Chain Reconstruction ◽  
Operation Duration ◽  
Air Conduction

Abstract Objective To compare the results of endoscopic and microscopic ossicular chain reconstruction surgery. Methods Patients undergoing ossicular chain reconstruction surgery via an endoscopic (n = 31) or microscopic (n = 34) technique were analysed for age, gender, Middle Ear Risk Index, ossicular chain defect, incision type, ossicular chain reconstruction surgery material, mean air conduction threshold, air–bone gap, air–bone gap gain, word recognition score, mean operation duration and mean post-operative follow up. Results Post-operative air conduction, air–bone gap and word recognition score improved significantly in both groups (within-subject p < 0.001 for air conduction and air–bone gap, and 0.026 for word recognition score); differences between groups were not significant (between-subject p = 0.192 for air conduction, 0.102 for air–bone gap, and 0.709 for word recognition score). Other parameters were similar between groups, except for incision type. However, endoscopic ossicular chain reconstruction surgery was associated with a significantly shorter operation duration (p < 0.001). Conclusion Endoscopic ossicular chain reconstruction surgery can achieve comparable surgical and audiological outcomes to those of microscopic ossicular chain reconstruction surgery in a shorter time.

Soft Impact in a Biomechanical System With Shape Memory Element

2017 ◽  
Vol 12 (6) ◽  
Author(s):  
R. Rusinek ◽  
M. Szymanski ◽  
J. Warminski
Keyword(s):  
Shape Memory ◽  
Middle Ear ◽  
Polynomial Function ◽  
Ossicular Chain ◽  
Excitation Amplitude ◽  
Patient Needs ◽  
Memory Element ◽  
The Impact ◽  
Irregular Behavior ◽  
Two Degree Of Freedom

The analysis of the shape memory prosthesis (SMP) of the middle ear is presented in this paper. The shape memory prosthesis permits the adjustment of its length to individual patient needs, but sometimes the prosthesis cannot be properly fixed to the stapes. In this case, the impact between the prosthesis and stapes is important. Therefore, the reconstructed middle ear is modeled as a two degree-of-freedom system with a nonlinear shape memory element and soft impact to represent its behavior when the prosthesis is not properly placed or fixed. The properties of the shape memory prosthesis, in the form of a helical spring, are represented by a polynomial function. The system exhibits advisable periodic and undesirable aperiodic and irregular behavior depending on the excitation amplitude, the frequency, and the prosthesis length. The prosthesis length can change, resulting in a modification of the distance between the prosthesis and the stapes. The results of this study provide an answer in terms of how the prosthesis length, which produces the ossicular chain tension, influences the system dynamics and its implication in medical practice.

Ossicular Chain Reconstruction in a Developing Country

2018 ◽  
Vol 127 (5) ◽  
pp. 306-311 ◽  
Author(s):  
Es-Hak Bedri ◽  
Miriam Redleaf
Keyword(s):  
Tympanic Membrane ◽  
Developing Country ◽  
Middle Ear ◽  
Granulation Tissue ◽  
Ossicular Chain ◽  
Single Stage ◽  
Limited Resources ◽  
Closure Rate ◽  
Average Improvement ◽  
Ossicular Chain Reconstruction

Objectives: In Ethiopia, 2-stage operations with middle ear prostheses are economically unfavorable. We hypothesized that single-stage autologous ossiculoplasty results in acceptable tympanic membrane (TM) and hearing improvements in a setting of limited resources. Methods: One hundred eighty-eight patients (197 ears) who underwent 1-stage autologous ossiculoplasty for ossicular dysfunction are presented. All but 14 of these ears also had perforations of the TM. Conditions of the middle ear were granulation tissue, ossicular disruption only, tympanosclerosis, and cholesteatoma. Reconstructions of the ossicular chain were performed with autologous ossicles only. Results: The closure rate of TM perforations was 95%. Preoperative air bone gaps were 27 to 60 dB (mean [SD] = 44 [7] dB); postoperative air bone gaps were 0 to 50 dB (average [SD] = 23 [10] dB), for an average improvement of 21 dB across all reconstruction types ( P < .001). The largest favorable changes in air bone gaps were with incus and malleus columellas from the footplate to the TM (33 and 23 dB, respectively) ( P < .001). No patient had worsening of sensorineural hearing levels or extrusion of the reconstructed ossicles. Conclusion: Autologous ossiculoplasty performed well in this setting. Acceptable TM closure rates and improvement of air bone gaps were seen in 1-stage operations without the use of prostheses.

3D models related to the publication: The early evolution of cranial appendages in Bovoidea revealed by new species of Amphimoschus (Mammalia: Ruminantia) from China

MorphoMuseuM ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. e151
Author(s):  
Yi-Kun Li ◽  
Bastien Mennecart ◽  
Manuela Aiglstorfer ◽  
Xi-Jun Ni ◽  
Qiang Li ◽  
...  
Keyword(s):  
New Species ◽  
3D Models ◽  
Early Evolution

scholarly journals Scanning Electron Microscopy in the Evaluation of Defects to the Ossicular Chain in the Course of Chronic Otitis Media

2019 ◽  
pp. 014556131987391
Author(s):  
Agnieszka Wiatr ◽  
Katarzyna Swiezy ◽  
Jacek Skladzien ◽  
Maciej Wiatr
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Chronic Inflammation ◽  
Otitis Media ◽  
Middle Ear ◽  
Chronic Otitis Media ◽  
Ossicular Chain ◽  
Suppurative Otitis Media ◽  
Ear Ossicles ◽  
Scanning Electron

Objective: Chronic otitis media is a heterogeneous disorder. Chronic suppurative otitis media with cholesteatoma and, to a lesser extent, chronic otitis media with granulation lead to the destruction of bone structures within the middle ear. Bone loss may appear in the prominence of the horizontal semicircular canals and the bony canal of the facial nerve. The inflammatory process may spread to the bony labyrinth of the sigmoidal sinuses and the cranial cavities. Materials and Methods: The analysis comprised the examination of fragments of auditory ossicles removed during surgery in 21 patients with various types of chronic inflammation of the middle ear. The purpose of this study was to evaluate the usefulness of scanning electron microscopy in evaluating the erosion of middle ear ossicles in different types of chronic otitis media. Images captured at various magnifications were used for the best possible illustration of the observed lesions in bone tissue. Results: The observed lesions and the degree of bone surface damage were dependent on the type of chronic inflammation of the middle ear. The largest destructive changes in the ossicular chain were observed in chronic otitis media with cholesteatoma; smaller changes were observed in chronic otitis media with granulation. Conclusion: In the case of damage to the ossicles inflicted by inflammation, the use of a modeled bone block made of a temporal bone taken from outside the tympanic cavity or a biomaterial prosthesis is a good choice in ossiculoplasty.

Scanning Laser Doppler Vibrometry of the Middle Ear Ossicles

1997 ◽  
Vol 76 (4) ◽  
pp. 213-222 ◽  
Author(s):  
Geoffrey R. Ball ◽  
Alex Huber ◽  
Richard L. Goode
Keyword(s):  
Middle Ear ◽  
Single Point ◽  
Three Dimensional ◽  
Laser Doppler Vibrometer ◽  
Ossicular Chain ◽  
Laser Doppler ◽  
Scanning Laser ◽  
Scanning Laser Doppler Vibrometer ◽  
Point Analysis ◽  
Ear Ossicles

This paper describes measurements of the vibratory modes of the middle ear ossicles made with a scanning laser Doppler vibrometer. Previous studies of the middle ear ossicles with single-point laser Doppler measurements have raised questions regarding the vibrational modes of the ossicular chain. Single-point analysis methods do not have the ability to measure multiple points on the ossicles and, consequently, have limited ability to simultaneously record relative phase information at these points. Using a Polytec Model PSV-100, detailed measurements of the ossicular chain have been completed in the human temporal bone model. This model, when driven with a middle ear transducer, provides detailed three-dimensional data of the vibrational patterns of the middle ear ossicles. Implications for middle ear implantable devices are discussed.

Bondy's Modified Radical Mastoidectomy Revisited

1994 ◽  
Vol 73 (1) ◽  
pp. 15-18 ◽  
Author(s):  
Dennis G. Pappas
Keyword(s):  
Middle Ear ◽  
Disease Process ◽  
Ossicular Chain ◽  
Normal Hearing ◽  
The Body ◽  
Radical Mastoidectomy ◽  
Pars Tensa ◽  
Modified Radical Mastoidectomy

The original criteria for modifying a radical mastoidectomy were: (I) an intact pars tensa and a defective pars flaccid a with cholesteatoma; (2) normal or near normal hearing; and (3) an intact, functional ossicular chain. We propose a fourth criterion: that the cholesteatoma site be delineated lateral to the body of the incus. Control of the disease process is easily assured if the lesion is in that area. Our recommended fourth criterion is based on the results of a five-year study of fifty-two cases that met the original criteria. The cholesteatoma reoccurred in the middle ear in only one case. In six cases, periodic care is necessary because of retraction to the grafted attic area. The procedure and technique used in these patients and the excellent results are discussed in this article.

scholarly journals Management of Benign Middle Ear Tumors: A Series of 7 Cases

2017 ◽  
Vol 96 (10-11) ◽  
pp. 426-432
Author(s):  
Z. Jason Qian ◽  
Amy M. Coffey ◽  
Kathleen M. O'Toole ◽  
Anil K. Lalwani
Keyword(s):  
Surgical Management ◽  
Middle Ear ◽  
Ossicular Chain ◽  
Clinical Findings ◽  
Mastoid Cavity ◽  
Canal Wall ◽  
Tumor Excision ◽  
Canal Wall Down ◽  
Canal Wall Down Mastoidectomy ◽  
Rare Group

Benign middle ear tumors represent a rare group of neoplasms that vary widely in their pathology, anatomy, and clinical findings. These factors have made it difficult to establish guidelines for the resection of such tumors. Here we present 7 unique cases of these rare and diverse tumors and draw from our experience to recommend optimal surgical management. Based on our experience, a postauricular incision is necessary in nearly all cases. Mastoidectomy is required for tumors that extend into the mastoid cavity. Whenever exposure or hemostasis is believed to be inadequate with simple mastoidectomy, canal-wall-down mastoidectomy should be performed. Finally, disarticulation of the ossicular chain greatly facilitates tumor excision and should be performed early in the procedure.

Influence of ossicular chain malformation on the performance of round-window stimulation: A finite element approach

2019 ◽  
Vol 233 (5) ◽  
pp. 584-594 ◽  
Author(s):  
Houguang Liu ◽  
Hu Zhang ◽  
Jianhua Yang ◽  
Xinsheng Huang ◽  
Wen Liu ◽  
...  
Keyword(s):  
Finite Element ◽  
Middle Ear ◽  
Basilar Membrane ◽  
Round Window ◽  
Low Frequency ◽  
Element Model ◽  
Ossicular Chain ◽  
Asymmetric Structure ◽  
Low Frequencies ◽  
Stapes Fixation

As a novel application of implantable middle ear hearing device, round-window stimulation is widely used to treat hearing loss with middle ear disease, such as ossicular chain malformation. To evaluate the influence of ossicular chain malformations on the efficiency of the round-window stimulation, a human ear finite element model, which incorporates cochlear asymmetric structure, was constructed. Five groups of comparison with experimental data confirmed the model’s validity. Based on this model, we investigated the influence of three categories of ossicular chain malformations, that is, incudostapedial disconnection, incus and malleus fixation, and fixation of the stapes. These malformations’ effects were evaluated by comparing the equivalent sound pressures derived from the basilar membrane displacement. Results show that the studied ossicular chain malformations mainly affected the round-window simulation’s performance at low frequencies. In contrast to the fixation of the ossicles, which mainly deteriorates round-window simulation’s low-frequency performance, incudostapedial disconnection increases this performance, especially in the absence of incus process and stapes superstructure. Among the studied ossicular chain malformations, the stapes fixation has a much more severe impact on the round-window stimulation’s efficiency. Thus, the influence of the patients’ ossicular chain malformations should be considered in the design of the round-window stimulation’s actuator. The low-frequency output of the round-window simulation’s actuator should be enhanced, especially for treating the patients with stapes fixation.

Sign in / Sign up

Export Citation Format

Share Document