The trachea serves a variety of functions during breathing and swallowing. In cases requiring a partial resection, the treatment may involve anastomosis of the healthy ends of the trachea. The tension in the anastomosis should not exceed 1,000 g. Traditional methods for estimating tension in the trachea are very invasive. The aim of this work is to develop a noninvasive optical system devoted to estimate the tension of the trachea in vivo. An optical system was designed using a light source and a photosensor. To determine the most suitable wavelength for the light source, a photoacoustic spectroscopy study was performed. To test the system, a cadaveric pig trachea was mounted on a universal testing machine, and it was subjected to three tensile tests of up to 30 mm elongation. The optical response was measured at 0, 10, 20, and 30 mm elongation. An exponential response was observed so that the optical voltage-response curves were adjusted, and three exponential equations were derived to correlate the voltage with the optical response. We can conclude that the proposed optical system is able to noninvasively estimate the tension of a cadaveric porcine trachea.

中文翻译：

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用反射光学方法评估猪气管中的拉伸力

气管在呼吸和吞咽时具有多种功能。如果需要部分切除，则治疗可能涉及气管健康端的吻合。吻合术中的张力不应超过1,000克。估计气管张力的传统方法是非常侵入性的。这项工作的目的是开发一种非侵入性光学系统，专门用于估计体内气管的张力。使用光源和光电传感器设计了光学系统。为了确定最适合光源的波长，进行了光声光谱研究。为了测试该系统，将尸体猪气管安装在通用测试机上，并对其进行了三个拉伸测试，拉伸测试的伸长率最高为30 mm。在0、10、20和30毫米伸长下测量光学响应。观察到指数响应，从而调整了光电压响应曲线，并推导了三个指数方程，以使电压与光响应相关。我们可以得出结论，建议的光学系统能够无创地估计尸体猪气管的张力。