ausblenden:
Schlagwörter:
Build-up pressure Narrow inlet Natural conditions Vocal folds Working well Biomimetics Prosthetics Vortex flow Speech
Zusammenfassung:
The human larynx is a miscellaneous organ, which main functions are phonation, protection, and regulation of the air ways. The VF and the FVF make up the laryngeal double valve that is required for the ability of building up the abdominal prelum. With the loss of the larynx, the person concerned suffers from many handicaps, amongst others, the disability to build up abdominal pressure. The development of a self-regulating double clack valve for a functional laryngeal prosthesis is the subject of this thesis. The valve was designed to imitate the laryngeal double valve function. A model with a narrow and a wide inlet was built to abstract the larynx and its vocal folds and false vocal folds as clacks. When using the narrow inlet model, it was shown, that the FVC were closed during expiration, whereas the VC were closed during inspiration. Whereas using the wide inlet demonstrated that the VC were closed during expiration and the FVC were closed during inspiration. To simulate fluid flow the angle of the VC and of the FVC, the distance between both clacks and the flow rate were altered against each other. During certain simulations vortices were built between the clacks, which build up pressure upon the particular clack and initiated the closure. Vortices occurred significantly more often during simulations with a narrow inlet than a wide one. The developed "two way clack valve" was shown to be working well while using the narrow inlet. Furthermore the narrow inlet model describes the natural conditions in the human larynx more appropriate than the wide one. The designed valve represents a fundament for future work on the functional laryngeal prosthesis. © 2011 by Walter de Gruyter Berlin Boston.
