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)
METHODS
• Comparison of pre and postoperative PTA ;
• Air-Bone-Gap ;
• Deducing the auditive gains .
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