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Journal of Biomedical Engineering ; (6): 1018-1027, 2021.
Article in Chinese | WPRIM | ID: wpr-921841


Spinal fusion is a standard operation for treating moderate and severe intervertebral disc diseases. In recent years, the proportion of three-dimensional printing interbody fusion cage in spinal fusion surgery has gradually increased. In this paper, the research progress of molding technology and materials used in three-dimensional printing interbody fusion cage at present is summarized. Then, according to structure layout, three-dimensional printing interbody fusion cages are classified into five types: solid-porous-solid (SPS) type, solid-porous-frame (SPF) type, frame-porous-frame (FPF) type, whole porous cage (WPC) type and others. The optimization process of three-dimensional printing interbody fusion cage and the advantages and disadvantages of each type are analyzed and summarized in depth. The clinical application of various types of 3D printed interbody fusion cage was introduced and summarized later. Lastly, combined with the latest research progress and achievements, the future research direction of three-dimensional printing interbody fusion cage in molding technology, application materials and coating materials is prospected in order to provide some reference for scholars engaged in interbody fusion cage research and application.

Humans , Intervertebral Disc Degeneration , Intervertebral Disc Displacement , Porosity , Printing, Three-Dimensional , Spinal Fusion
Journal of Biomedical Engineering ; (6): 1146-1149, 2009.
Article in Chinese | WPRIM | ID: wpr-244673


This paper discusses the technology of combined electric and acoustic stimulation (EAS) of the auditory system, which is a new therapy for the patients suffering from severe to profound high- and mid-frequency hearing loss but still having their low-frequency hearing. EAS uses hearing aid and cochlear implant technology together in the same ear. The hearing aid acoustically amplifies at low-frequencies, while the cochlear implant electrically stimulates at mid- and high-frequencies. The inner ear processes acoustic and electric stimuli simultaneously. This technique can provide substantial benefit in speech understanding for individuals with severe high-frequency hearing loss and can maintain their residual lower-frequency acoustic hearing. The study of EAS would significantly enhance the conventional cochlear implant therapy and benefit the patients afflicted with severe to profound hearing loss.

Acoustic Stimulation , Audiometry , Auditory Pathways , Auditory Threshold , Physiology , Cochlear Implantation , Cochlear Implants , Combined Modality Therapy , Electric Stimulation , Hearing Loss , Diagnosis , General Surgery , Therapeutics , Hearing Loss, High-Frequency , Diagnosis , General Surgery , Therapeutics , Humans
Journal of Biomedical Engineering ; (6): 1384-1387, 2009.
Article in Chinese | WPRIM | ID: wpr-244621


This paper discusses virtual channels of cochlear implant, which is produced by simultaneous or sequential activation of adjacent cochlear implant electrodes. Virtual channels create and transfer more available spectral pitch information with the limited number of fixed electrodes, which can be recognized as pitch percepts intermediate to those produced by each electrode separately. This technique not only utilizes the interaction of electrodes but also increases the number of place-pitch steps available to cochlear implant listeners. Virtual channels could be used to realize speech recognition in noisy environment, in enjoying music, and in understanding Chinese language. The study of virtual channels would significantly enhance the traditional cochlear implant therapy and benefit people suffering severe to profound hearing loss.

Cochlear Implants , Computer Simulation , Electric Stimulation , Methods , Electrodes, Implanted , Evoked Potentials, Auditory , Physiology , Hearing Loss, Sensorineural , Therapeutics , Humans
Article in Chinese | WPRIM | ID: wpr-291218


The modern multi-channel cochlear implant devices produce good speech recognition scores in quiet. However, the ability of most implant users to understand speech with the speech maskers remains quite poor. The goal of this study is to investigate the effect of spectral details encoding in speech processing on Mandarin recognition based on various acoustic models. The improvement of the strategies that encoded spectral details was observed for speech recognition with speech maskers. We also proposed the implementation methods to improve the strategy and stimulate further investigation.

China , Cochlear Implants , Computer Simulation , Humans , Language , Models, Biological , Prosthesis Design , Signal Processing, Computer-Assisted , Sound Spectrography , Methods , Speech Acoustics , Speech Perception , Physiology
Journal of Biomedical Engineering ; (6): 1138-1141, 2006.
Article in Chinese | WPRIM | ID: wpr-320402


Cochlear implant (CI) is a neural prosthetic device used to provide the sensation of sound to those who are profoundly deaf by delivering electrical stimulus to auditory nerve directly . It is becoming one of the main research frontiers in the area of otology and rehabilitation engineering . This symposium proposes an introduction about the new achievements of cochlear implant research , which consists of the following parts: the structure of CI, new speech processing strategies, comparison of the clinical results of speech processing strategies and the hotspots of the research.

Algorithms , Cochlear Implants , Equipment Design , Signal Processing, Computer-Assisted