Biomechanical Models of Reconstructed Middle Ear

Abstract eng:
The biomechanical models of the human middle ear under tympanoplasty for different variants of reconstruction of the ossicular chain are proposed in this paper. Static and dynamic problems, including evaluation of initial stresses caused by introducing a prosthesis replacing the “malleuseincus” or “malleuse-incus-stapes” chain as well as analysis of eigen-modes and eigen-frequencies of the reconstructed middle ear (RME), are studied. For both problems three variants of tympanic membrane (TM) reconstruction techniques [1], a) cartilage plate, b) small island, and c) large island techniques, are considered. To bridge a gap in the ossicular chain, various types of the middle-ear prostheses are available for all degrees of destruction [1]. In our paper, total ossicular replacement prosthesis (TORP) and partial ossicular replacement prosthesis (PORP) made from titanium or gold are considered. TORPs are used in the case of a completely destroyed ossicular chain and placed between the stapes footplate and the reconstructed TM. In the case of an intact stapes, a PORP is used and placed between the stapes head and the TM. Depending on the TM reconstruction technique, various mathematical models of the RME are proposed. In the case of the cartilage plate techniques, the restored ТМ is modeled as close to a circular soft plate [2], and in the case of the large island or small island techniques, the ТМ is represented as a soft two-layered plate or a system of co-centrically joint one- and two-layered plates [3]. If the stapes is still intact and mobile, the anisotropic stiffness of the stapes annular ligament is represented by a fully occupied stiffness matrix. Otherwise, in the case when the stapes is fixed and its footplate is subjected to fenestration, the stiffness of the round window is taken into account in both static and dynamic models. The influence of the geometrical dimensions of the prosthesis and its position on stresses in the TM and the annular ligament as well as on eigen-frequencies of vibrating system of the RME are studied. Analysis of the calculations performed allows one to conclude that in order to exclude possible luxation of the stapes or avoid high pretensions and the significant shift of the eigen-frequency spectrum of the middle-ear-vibrating system, the prosthesis should be positioned as close to the centre of the reconstructed eardrum as possible. 056.txt.txt 057.txt.txt 059.txt.txt 060.txt.txt 062.txt.txt 064.txt.txt 066.txt.txt 067.txt.txt 069.txt.txt 070.txt.txt 071.txt.txt 073.txt.txt 074.txt.txt 075.txt.txt 076.txt.txt 079.txt.txt 080.txt.txt 082.txt.txt 083.txt.txt 084.txt.txt 085.txt.txt 086.txt.txt 087.txt.txt 089.txt.txt 091.txt.txt 092.txt.txt 094.txt.txt 095.txt.txt 096.txt.txt 097.txt.txt 098.txt.txt 100.txt.txt 101.txt.txt 103.txt.txt 104.txt.txt 105.txt.txt 106.txt.txt 107.txt.txt 108.txt.txt 109.txt.txt 110.txt.txt 111.txt.txt 115.txt.txt 117.txt.txt 118.txt.txt 119.txt.txt 120.txt.txt 121.txt.txt 122.txt.txt 123.txt.txt 124.txt.txt 125.txt.txt 127.txt.txt 128.txt.txt 131.txt.txt 132.txt.txt 133.txt.txt 134.txt.txt 135.txt.txt 137.txt.txt 139.txt.txt 141.txt.txt 142.txt.txt 143.txt.txt 145.txt.txt 147.txt.txt 148.txt.txt 151.txt.txt 154.txt.txt 155.txt.txt 156.txt.txt 159.txt.txt 160.txt.txt 162.txt.txt 164.txt.txt 165.txt.txt 166.txt.txt 170.txt.txt 171.txt.txt 173.txt.txt 175.txt.txt 177.txt.txt 178.txt.txt 179.txt.txt 180.txt.txt 181.txt.txt 184.txt.txt 187.txt.txt 188.txt.txt 189.txt.txt 191.txt.txt 193.txt.txt 195.txt.txt 197.txt.txt 198.txt.txt 199.txt.txt 200.txt.txt 201.txt.txt 202.txt.txt 203.txt.txt 204.txt.txt 205.txt.txt 206.txt.txt 207.txt.txt 208.txt.txt 209.txt.txt 212.txt.txt 215.txt.txt 216.txt.txt 217.txt.txt 218.txt.txt 219.txt.txt 220.txt.txt 223.txt.txt 224.txt.txt 225.txt.txt 229.txt.txt 230.txt.txt 231.txt.txt 232.txt.txt 234.txt.txt 235.txt.txt 236.txt.txt 237.txt.txt 238.txt.txt 239.txt.txt 240.txt.txt 242.txt.txt 243.txt.txt 244.txt.txt 247.txt.txt 249.txt.txt 250.txt.txt 251.txt.txt 252.txt.txt 253.txt.txt 255.txt.txt 256.txt.txt 257.txt.txt 258.txt.txt 260.txt.txt 261.txt.txt 262.txt.txt 264.txt.txt 266.txt.txt 267.txt.txt 271.txt.txt 272.txt.txt 273.txt.txt 275.txt.txt 276.txt.txt 277.txt.txt 278.txt.txt 280.txt.txt 281.txt.txt 282.txt.txt 283.txt.txt 284.txt.txt 285.txt.txt 286.txt.txt 287.txt.txt 288.txt.txt 289.txt.txt 290.txt.txt 291.txt.txt 293.txt.txt 294.txt.txt 296.txt.txt 297.txt.txt 298.txt.txt 299.txt.txt 301.txt.txt 302.txt.txt 304.txt.txt 305.txt.txt 307.txt.txt 310.txt.txt 312.txt.txt 316.txt.txt 317.txt.txt 320.txt.txt 322.txt.txt 324.txt.txt 325.txt.txt 327.txt.txt 328.txt.txt 329.txt.txt 330.txt.txt 335.txt.txt 337.txt.txt 338.txt.txt 340.txt.txt 344.txt.txt 348.txt.txt 349.txt.txt 350.txt.txt 351.txt.txt 352.txt.txt 353.txt.txt 356.txt.txt 358.txt.txt 359.txt.txt 360.txt.txt 362.txt.txt 363.txt.txt 364.txt.txt 367.txt.txt 368.txt.txt 369.txt.txt 371.txt.txt 372.txt.txt 376.txt.txt 377.txt.txt 378.txt.txt 380.txt.txt 383.txt.txt 385.txt.txt 386.txt.txt 387.txt.txt 389.txt.txt 393.txt.txt 394.txt.txt 396.txt.txt 397.txt.txt 399.txt.txt 401.txt.txt 402.txt.txt 403.txt.txt 405.txt.txt 406.txt.txt 409.txt.txt 410.txt.txt 412.txt.txt 413.txt.txt 415.txt.txt 417.txt.txt 418.txt.txt 419.txt.txt 421.txt.txt 422.txt.txt 423.txt.txt 427.txt.txt 428.txt.txt 432.txt.txt 434.txt.txt 435.txt.txt 436.txt.txt 438.txt.txt 440.txt.txt 441.txt.txt 442.txt.txt 444.txt.txt 445.txt.txt 446.txt.txt 448.txt.txt 449.txt.txt 450.txt.txt 451.txt.txt 454.txt.txt 456.txt.txt 460.txt.txt 464.txt.txt 466.txt.txt 467.txt.txt 468.txt.txt 470.txt.txt 472.txt.txt 473.txt.txt 475.txt.txt 479.txt.txt 482.txt.txt 483.txt.txt 486.txt.txt 487.txt.txt 488.txt.txt 491.txt.txt 492.txt.txt 496.txt.txt 499.txt.txt 501.txt.txt 504.txt.txt 507.txt.txt 508.txt.txt 509.txt.txt 512.txt.txt 518.txt.txt 519.txt.txt 520.txt.txt 521.txt.txt 524.txt.txt 525.txt.txt 527.txt.txt 528.txt.txt 529.txt.txt 532.txt.txt 535.txt.txt 536.txt.txt 540.txt.txt 541.txt.txt 543.txt.txt 544.txt.txt 545.txt.txt 546.txt.txt 548.txt.txt 549.txt.txt 550.txt.txt 551.txt.txt 554.txt.txt 555.txt.txt 557.txt.txt 558.txt.txt 559.txt.txt 560.txt.txt 562.txt.txt 563.txt.txt 564.txt.txt 565.txt.txt 566.txt.txt 567.txt.txt 568.txt.txt 569.txt.txt 573.txt.txt 574.txt.txt 576.txt.txt 577.txt.txt 578.txt.txt 579.txt.txt 580.txt.txt 583.txt.txt 584.txt.txt 585.txt.txt 586.txt.txt 588.txt.txt 589.txt.txt 591.txt.txt 595.txt.txt 599.txt.txt 600.txt.txt 603.txt.txt 604.txt.txt 605.txt.txt 606.txt.txt 607.txt.txt 608.txt.txt 609.txt.txt 611.txt.txt 612.txt.txt 613.txt.txt 617.txt.txt 618.txt.txt 619.txt.txt 625.txt.txt 626.txt.txt 628.txt.txt 629.txt.txt 630.txt.txt 634.txt.txt 635.txt.txt 636.txt.txt 637.txt.txt 638.txt.txt 639.txt.txt 640.txt.txt 641.txt.txt 642.txt.txt 643.txt.txt 647.txt.txt 648.txt.txt 650.txt.txt 652.txt.txt 653.txt.txt 654.txt.txt 656.txt.txt 658.txt.txt 659.txt.txt 660.txt.txt 661.txt.txt 662.txt.txt 664.txt.txt 665.txt.txt 667.txt.txt 669.txt.txt 670.txt.txt 672.txt.txt 673.txt.txt 674.txt.txt 675.txt.txt 676.txt.txt 677.txt.txt 678.txt.txt 679.txt.txt 680.txt.txt 681.txt.txt 683.txt.txt 684.txt.txt 685.txt.txt 687.txt.txt 688.txt.txt 690.txt.txt 691.txt.txt 693.txt.txt 694.txt.txt 695.txt.txt 697.txt.txt Brochure.txt.txt Programme.txt.txt The asterisk denotes the presenting author. References [1] D. Mürbe, T. Zahnert, M. Bornitz, K.-B. Hüttenbrink, Acoustic properties of different cartilage reconstruction techniques of the tympanic membrane. Laryngoscope, 112, 1769-1776, 2002. [2] G. Mikhasev, S. Ermochenko, M. Bornitz, On the strain–stress state of the reconstructed middle ear after inserting a malleus-incus prosthesis, Mathematical Medicine and Biology, doi:10.1093/imammb/dqp020, Nov 2009. [3] S. Yermochenko, G. Mikhasev, L. Petrova. Calculation of the strain-stress state of the middle ear under its total reconstruction taking into account the influence of the tympanic membrane remnants, Russian Journal of Biomechanics, 12, 23-35, 2008.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket