Stapes Prostheses - Superelastic Nitinol

What are the benefits of nitinol & super-elasticity?

Nitinol zeichnet sich durch ein einzigartiges Werkstoffverhalten aus, da man mit kleinen Änderungen der Zusammensetzung und des Herstellungsprozesses entweder den Effekt des mechanischen Formgedächtnisses (Superelastizität) oder den des thermischen Formgedächtnisses (Shape-Memory-Effekt) erreicht.
Nitinol Effect
Superelastic Nitinol = mechanical effect                                                        Thermo-Reactive Nitinol = thermal effect
Nitinol features a unique material behavior. Small changes to the composition and the manufacturing process allow you to change the effect of the mechanical shape memory (super-elasticity) or the thermal shape memory (shape memory effect).

The alloy is light-weight with excellent biocompatibility. The super-elasticity causes the material to return to its original shape through its intrinsic tension when not under load.
Unlike the shape memory effect, no temperature changes are necessary and the potential risk of heat-induced necrosis is virtually eliminated. Furthermore, the surgical procedure is abbreviated because no heating of the prosthesis is required.

Compared to all other stapes prostheses, the super-elasticity of the hook greatly facilitates both insertion and the closing procedure. By applying light vertical pressure, the prosthesis moves into place without the need for subsequent fixation or adjustment. The flat band hook evenly and fully encloses the long crus. Together, the shape and material of the prosthesis ensure optimal positioning and permanent fixation to the crus. The flat band prosthesis diffuses the impact of pressure on the long crus, which helps prevent bone constriction.
  • Self crimping - No additional closing step, no heat
  • Vertical insertion
  • Innovative combination of Nitinol (hook) and
    PTFE (shaft)
  • Optimal pressure distribution on the incus
  • Shape maintenance
  • Easy handling
  • Three different hook sizes
  • Single, sterile packaging

The easy-fit design of the stapes prostheses
makes handling easy:

Little force insertion
Insertion requires only minimum pressure, which avoids damage to the incus. The equal pressure distribution ensures an optimal fit.

Preyer incus fork, 16 cm

Art. No. 10-670-00
The average diameter of the incus is 0.7mm, but the exact diameter can vary from patient to patient. For this reason an incus fork with 0.7mm diameter was specially developed in collaboration with Prof. Serena Preyer, to ascertain the proper size of stapes-prostheses. The size of the hook is determined by simply placing the incus fork over the incus.
Dr. Preyer
Prof. Dr. med. Serena Preyer
Head of ENT
Deaconess Hospital
Karlsruhe, Germany
Using the new super-elastic stapes nitinol piston prostheses removes the critical surgical step of crimping the piston loop to the long process of incus during stapes surgery.

Stapes Prostheses made of Superelastic Nitinol with PTFE shaft

  • Wire ø: 0.2 mm
  • PTFE shaft ø: 0.4 mm and ø: 0.6 mm
  • The shortenable stapes prostheses can be shortened up to a overall length of 4.25 mm (= insert length of 3.25 mm)
  • Single, sterile packaging
insert length
Art. No.FeatureInsert lengthShaft Ø Incus Ø
10740425M 4.25 mm0.4 mmstandard 0.7 mm
10740450M 4.50 mm0.4 mmstandard 0.7 mm
10740475M 4.75 mm0.4 mmstandard 0.7 mm
10740600Mshortenable6.00 mm0.4 mmstandard 0.7 mm
10740425S 4.25 mm0.4 mmsmall < 0.7 mm
10740450S 4.50 mm0.4 mmsmall < 0.7 mm
10740475S 4.75 mm0.4 mmsmall < 0.7 mm
10740600Sshortenable6.00 mm0.4 mmsmall < 0.7 mm
10740425L 4.25 mm0.4 mmlarge > 0.7 mm
10740450L 4.50 mm0.4 mmlarge > 0.7 mm
10740475L 4.75 mm0.4 mmlarge > 0.7 mm
10740600Lshortenable6.00 mm0.4 mmlarge > 0.7 mm
10760425M 4.25 mm0.6 mmstandard 0.7 mm
10760450M 4.50 mm0.6 mmstandard 0,7 mm
10760475M 4.75 mm0.6 mmstandard 0.7 mm
10760600Mshortenable6.00 mm0.6 mmstandard 0.7 mm
10760425S 4.25 mm0.6 mmsmall < 0.7 mm
10760450S 4.50 mm0.6 mmsmall < 0.7 mm
10760475S 4.75 mm0.6 mmsmall < 0.7 mm
10760600Sshortenable6.00 mm0.6 mmsmall < 0.7 mm
10760425L 4.25 mm0.6 mmlarge > 0.7 mm
10760450L 4.50 mm0.6 mmlarge > 0.7 mm
10760475L 4.75 mm0.6 mmlarge > 0.7 mm
10760600Lshortenable6.00 mm0.6 mmlarge > 0.7 mm
Insertion of a Superelastic Nitinol prosthesis

Filmed under supervision of Prof. Dr. med. Serena Preyer, Head of ENT in Deaconess Hospital Karlsruhe, Germany
Surgical pictures on the use of a Nitinol Prosthesis
Taken under the direction of Prof. Dr. med. Sudhoff, Bielefeld, Germany
OP-Bild Nitinol-Prothese
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