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Related Experiment Videos

[First experiences with a new nickel-titanium piston with a shape memory feature].

J Hornung1, J Zenk, B Schick

  • 1Hals-Nasen-Ohren-Klinik, Kopf- und Halschirurgie, Universitätsklinikum, 91054, Erlangen. Joachim.Hornung@hno.imed.uni-erlangen.de

HNO
|June 13, 2006
PubMed
Summary

A novel stapes prosthesis (SMart-Piston) simplifies prosthesis fixation during stapes surgery. Postoperative audiological testing showed excellent air-bone gap closure, indicating successful outcomes for this innovative hearing restoration technique.

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Area of Science:

  • Otolaryngology
  • Biomedical Engineering
  • Surgical Innovation

Background:

  • Stapes surgery is crucial for hearing restoration in otosclerosis.
  • Secure prosthesis fixation to the incus is a critical surgical step.
  • Existing methods for prosthesis fixation can be challenging.

Purpose of the Study:

  • To introduce and describe the SMart-Piston, a novel stapes prosthesis with memory characteristics for wire crimping.
  • To evaluate the feasibility and initial outcomes of using the SMart-Piston in routine stapes surgery.

Main Methods:

  • The SMart-Piston prosthesis (0.5 mm shaft diameter, 4.25-4.5 mm length) was used in 15 patients undergoing stapes surgery.
  • Heat-induced wire crimping for prosthesis fixation was performed using CO2 laser (5 patients) or bipolar diathermy forceps (10 patients).

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  • Postoperative audiological testing, including air-bone gap (ABG) measurement, was conducted at an average of 21.9 days and in a subset of patients again after 435 days.

    • Main Results:

    • The median postoperative air-bone gap (ABG) was 8.7 dB +/- 7.7 dB.
    • 73% of patients achieved an ABG of 10 dB or less, with all patients having an ABG below 20 dB.
    • In patients followed for 435 days, the ABG averaged 4.4 dB +/- 2.4 dB, with all individuals showing an ABG below 10 dB.

    Conclusions:

    • The SMart-Piston prosthesis and its associated crimping technique significantly facilitate prosthesis fixation to the incus.
    • Initial audiological results are promising, demonstrating effective hearing restoration.
    • Long-term outcomes in a larger patient cohort are anticipated to further validate this innovative approach.