Abstract
The real-time monitoring of the working status of drainage tubes is crucial for successful surgical drainage and for informing clinicians of the drainage conditions of patients at different stages, to enable objective diagnosis and treatment. In this study, a method for monitoring the drainage condition of drainage tubes was proposed. The method was based on the principle of capacitance and was developed by analyzing the major states of drainage tubes in the process of drainage. Meanwhile, the principle of interdigital capacitance monitoring drainage was analyzed, and an interdigital capacitance device for the real-time monitoring of the working status of drainage tubes was designed. Ultimately, an experimental system for drainage simulation was established on the basis of the interdigital capacitance device and method for drainage monitoring. Results showed that the interdigital capacitance device for drainage monitoring can identify unobstructed or blocked drainage tubes effectively in real time. The device has a hydrophobic surface, so its electrodes do not undergo electrolysis and pollution due to adhesion. Hence the proposed capacitance-based method for monitoring the working states of drainage tubes has good application prospects in the postoperative drainage of abdominal and thoracic cavities.
Highlights
Surgical drainage is an important routine operation in surgery, which is widely applied in pre- and postsurgical treatment
This study proposed a method and designed an interdigital capacitance sensing device for monitoring the state of drainage tubes
This method was based on the principle of capacitance sensing, and the interdigital capacitance device was designed to monitor the states of drainage tubes and was fabricated with a simple method
Summary
Surgical drainage is an important routine operation in surgery, which is widely applied in pre- and postsurgical treatment. Inspection is the common clinical method used to solve the above problems, where the states of drainage tubes should be monitored and observed regularly. It is hard to observe blockages and requires patients and medical staff to examine drainage tubes regularly. Checking the working state of drainage tubes for unconscious or weakly conscious patients is more difficult and will increase the workload of medical staff. Studies have focused on the improvement of the intelligentized drainage tubes by means of sensors. Chen et al studied and applied a thoracic drainage system with a pressure sensor for the real-time detection of changes in pleural pressure to help clinical doctors judge the different periods of recovery of the chest [17]. Research on real-time supervision devices for monitoring the flow condition of drainage tubes has not been found. The device was fabricated by printed circuit technology and chemical vapor deposition technology
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