Reconstruction of the ossicular chain using a

new alloy memory titanium: memossicle ©

THE MEMOSSICLE PROSTHESIS

• ALLOY OF TITANIUM AND NICKEL :

Biocompatible and bio-inert

• SHAPE MEMORY :

Constant pressure and elasticity

ACOUSTIC PERFORMANCE ?

MATERIALS

Between september 1996 to june 1999

164 Patients; 144 controled (88%)

84 Females / 80 males

Mean age : 41 years old (5-77)

 

INDICATIONS

• 62 % : inflammatory middle ear

• 70 % : more than one surgical procedure

METHODS

• Comparison of pre and postoperative PTA ;

• Air-Bone-Gap ;

• Deducing the auditive gains .

TYPES OF PROTHESIS

C-shape PORP Y-shape TORP T-shape TORP

The PORP prosthesis

Left ear

The TORP prosthesis(with malleus)

Left ear

The TORP prosthesis(without malleus)

Left ear

AIR BONE GAP / Pathology

ABG(dB)

0-10 11-20 21-30 > 31 GAIN(%)

Reconstruction cavities(N=18)

2 7 5 4 22

Tympanoplasty(N=46)

19 13 8 6 30

Cholesteatoma(N=76)

19 22 18 17 33

TOTAL(N=140)

4129%

4230%

3122%

2719%

 

AIR BONE GAP / Prosthesis

0-10 11-20 21-30 31-40 41-50

PORP C 30(38%)

23 18 4 4

TORP malleus +

7(32%)

5 4 2 4

TORP malleus -

8(19%)

14 10 8 3 

dB

CAUSES OF FAILURE

Recurrence of chronic otitis media

Extrusion of the prosthesis

Displacement of the prosthesis

Bone contact

CONCLUSION

• New shape memory prosthesis

• Biocompatible

• Performant