Airflow Resistance of Airflow-Regulating Devices Described by Independent Coefficients

Rehabilitation after laryngectomy includes more and more the use of airflow-regulating devices such as shunt valves (SVs), tracheostoma valves (TSVs), and heat and moisture exchange (HME) filters. In determining the quality of those devices, airflow resistance is a very important factor. It is curre...

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Bibliographic Details
Published in:Annals of otology, rhinology & laryngology rhinology & laryngology, 2001-07, Vol.110 (7), p.639-645
Main Authors: Verkerke, Gijsbertus Jacob, Geertsema, Albert Anne, Schutte, Harm Kornelis
Format: Article
Language:English
Subjects:
Airway Resistance - physiology
Biological and medical sciences
Diseases of the upper aerodigestive tract
Ent and stomatology
Equipment Design
Filtration - instrumentation
Head and neck surgery. Maxillofacial surgery. Dental surgery. Orthodontics
Humans
Laryngectomy - rehabilitation
Medical sciences
Postoperative Complications - physiopathology
Pulmonary Ventilation - physiology
Radiotherapy. Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. Diet therapy and various other treatments (general aspects)
Respiratory Protective Devices
Surgery (general aspects). Transplantations, organ and tissue grafts. Graft diseases
Surgery of the upper aerodigestive tract
Tracheostomy - instrumentation
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Summary:Rehabilitation after laryngectomy includes more and more the use of airflow-regulating devices such as shunt valves (SVs), tracheostoma valves (TSVs), and heat and moisture exchange (HME) filters. In determining the quality of those devices, airflow resistance is a very important factor. It is currently defined as pressure drop divided by airflow. However, for most applications, this definition does not result in a pressure- and airflow-independent parameter. Therefore, a new set of parameters is defined and applied to pressure-airflow curves of airflow-regulating devices. Pressure drop over TSVs and HME filters appears to have a squared relationship with flow. In SVs, it has a linear relationship. The new set of parameters describes the pressure-airflow relationship properly for all considered devices. In conclusion, theoretical predictions of flow mechanics appear to be valid for SVs, TSVs, and HME filters. Only 2 coefficients are necessary to describe the pressure-flow characteristics of these airflow-regulating devices, independent of pressure drop over and flow through the device.
ISSN:0003-4894
1943-572X
DOI:10.1177/000348940111000709