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本文根据Horsfield K.和Cumming G.提出的非对称型支气管树模型,对气道中的流态和阻力以及呼吸气流阻力功进行了分析,并探讨了小气道病变对残气量、呼吸流量、肺的顺应性等方面的影响,试图为小气道的病变测定作进一步的理论探索.一、气道中的流态分析Weibel E.R.于1963年测量了五个正常人肺的气道直径和长度,提出了一支气管树的对称模型.此模型取气管以下的左右支气管为第一级,按分支向下逐渐增加级数,一般可分为20多级,每级直径相差较大.尽管这个模型尚未考虑支气管树的非对称性,但目前在气道的压力降和肺中气体混合的分析中是用得最为普遍的模型.Horsfield K.和Cumming G.在1968年测量了人肺中气道的直径和长度,提出了非对称的支气管树模型.他以最远端终末细支气管为1级,按相同直径向上至分叉处依次增级,建立了较为完整的31级支气管树模型.由于这种分级法比较切合实际,因此我们
In this paper, based on the asymmetric bronchial tree model proposed by Horsfield K. and Cumming G., the fluid flow and resistance in the airway and the resistance to respiratory airflow are analyzed. The effects of small airway disease on the residual volume, respiratory flow, lung Compliance and other aspects, trying to further study the pathological determination of small airway.First, the fluid flow in the airway Weibel ER in 1963 measured five normal lung airway diameter and length, proposed a Bronchial tree symmetrical model.This model takes the left and right bronchus below the trachea as the first stage, gradually increasing the number of branches down, generally divided into more than 20 levels, each stage larger diameter difference Although this model has not yet considered the bronchial tree But is currently the most commonly used model in the analysis of airway pressure drops and gas mixing in the lungs.Horsfield K. and Cumming G. measured the diameter and length of the airways in the human lung in 1968 , Proposed an asymmetric bronchial tree model.He established the more complete 31st grade bronchial tree model with the most distal terminal bronchiole as grade 1 and the same diameter up to the bifurcation.As a result of this Grading method more realistic, so we