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Use of the malleus handle as a landmark for localizing the round window membrane

H Silverstein1, B Durand, L E Jackson

  • 1Ear Research Foundation, 1901 Floyd St., Sarasota, FL 34239, USA. hsilverste@aol.com

Ear, Nose, & Throat Journal
|August 2, 2001
PubMed

Insights

Accurate placement of inner ear medication delivery devices like the Silverstein MicroWick is crucial. This study precisely mapped the round window

Area of Science:

  • Otolaryngology
  • Inner Ear Therapeutics
  • Surgical Anatomy

Background:

  • Direct application of medication to the inner ear via the round window is clinically desirable.
  • The Silverstein MicroWick enables direct, near-continuous inner ear perfusion.
  • Accurate localization of the round window is essential for successful device placement.

Purpose of the Study:

  • To determine the precise anatomical relationship between the malleus handle and the round window niche.
  • To provide reliable landmarks for accurate placement of the Silverstein MicroWick.
  • To facilitate improved direct inner ear drug delivery.

Main Methods:

  • Examination of 25 human cadaveric temporal bones.
  • Measurement of the distance from the umbo to the round window.
  • Determination of the angle from the long process of the malleus to the round window niche.

Main Results:

  • The average distance from the umbo to the round window was 3.44 mm (+/- 0.68).
  • The average angle from the long process of the malleus was 113.2 degrees (+/- 9.8).
  • A simple and reliable method for locating the round window was established.

Conclusions:

  • The established anatomical relationship between the malleus and the round window allows for accurate device placement.
  • This anatomical data supports the precise insertion of the Silverstein MicroWick for inner ear perfusion.
  • Improved localization techniques enhance the efficacy of direct inner ear medication delivery.

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