用于听骨链的生物陶瓷材料显微结构与性能的关系

通过对人听骨链系统的力学模型分析,研究了这一系统的声传导机械阻抗和声阻抗与系统质量、传导音频及听骨与组织结合强度的关系,从理论上提出了人工听骨链材料物理性质及显微结构的要求,并通过致密氧化铝陶瓷和增强多孔羟基磷灰石陶瓷(SPHC)人工听骨链的临床对比研究,证实了理论分析的正确性。可以认为 SPHC 是用于制作仿生听骨链较为理想的材料。

THE RELATIONSHIP BETWEEN MICROSTRUCTURE AND PROPERTIES OF BIOCERAMIC MATERIALS FOR OSSICULAR CHAIN

By analysing of mechanics model of human ossicular chain system,the ef-fects of the system mass,transmitted audio frequency and Combined strength of tissue withartificial ossicular chain(AOC) on mechanical and acoustic impedance of the system havebeen studied.Physical properties and microstructure of materials which are required forAOC have been theoretically presentted.Clinical implantationj investigation of AOC madefrom both alumina and strengthened porous hydroxyl-apatite ceramic(SPHC)have beencarried out respectively,the results are in accord with theoretical analyses.The study hasshowed that mechanical and acoustic impedance of system which are implantted withSPHC AOC are less than one implantted alumina AOC in the range speech sounds fre-quency,and the latter has showed more rapid weakening than the former above 200Hz.It issuggestted that SPHC is ideal material for AOC.