A non-invasive manometry system for esophageal varices

Abstract

The invention discloses an esophageal varicosity noninvasive manometric system. The esophageal varicosity noninvasive manometric system comprises a gastroscope, an acupressure air flow probe system and a laser range finder, wherein the acupressure air flow probe system is used for generating air flow beams with adjustable pressure. An output air tube of the acupressure air flow probe system extends into an endoscopic tube of the gastroscope through a gastroscope biopsy hole. The inlet end of the output air tube is provided with a first pressure sensor. The laser range finder acquires reflection light spots of an esophagus esophageal wall membrane under the action of the acupressure air flow probe system through an imaging optical fiber, and the imaging optical fiber extends into the endoscopic tube through the gastroscope biopsy hole. An esophagus esophageal image collected by an image sensor is transmitted to a central processing unit. The esophageal varicosity noninvasive manometric system is simple in structure, the measurement process is short, and the problem that rupture hemorrhage is caused by friction between an air bag of an existing device and a vascular wall is avoided; the measurement error is small, the measurement result is accurate and reliable, and the esophageal varicosity noninvasive manometric system is wide in application range and can be applied to manometry of small blood vessels.

Description

technical field [0001] The invention relates to the field of biomedical engineering, in particular to a non-invasive pressure measurement system for esophageal varices. Background technique [0002] Esophageal varices are a common complication in patients with liver cirrhosis, mainly due to the opening of collateral circulation in the lower esophagus due to elevated portal pressure, forming varicose veins (EVs) that bulge toward the inner wall of the esophagus. The annual new incidence rate is 7%, and about half of the patients with liver cirrhosis have already appeared at the time of diagnosis. The main symptom is EV rupture and bleeding, with an annual new incidence rate of about 12%, of which 5% occur in small EVs and 15% occur in large EVs. The incidence of EV rebleeding within 1 year is 60%, and the mortality rate within 6 weeks after each EV bleeding is 15% to 20%. Among them, 0% of patients with ChildA liver function and 30% of ChildC patients with liver function. T...

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Problems solved by technology

[0007] (1). Although non-invasive, wall-mounted manometry is a contact measurement. The pressure measurement process includes the pop-up of the airbag, inflated wall contact, pressure measurement, capsule collection, etc., which has the inherent inconvenience of contact measurement methods, such as the test process Long, rupture and bleeding caused by friction between the balloon and the vessel wall;

[0008] (2). The inner wall of the airbag can be seen through the video image during airbag pressure measurement. Even if the airbag is transparent, there are problems such as reflection and inconsistent absorption spectrum. The real biological endoscopic image cannot be seen, which is not convenient for doctors to diagnose intuitively;

[0009] (3). During pressure measurement with the air bag, the air bag not only clings to the measured vein, but also compresses the entire esophageal cavity. The total force is large, causing the overall movement of the measured vein and blood vessels, changing the state, and causing measurement errors;

[0010] (4). When measuring airbag pressure, rely on video images to judge the state of vein "just collapsed". Since the visual distance from the camera lens to the vein collapse is uncertain, the magnification of the image is inconsistent, whether it is judged by humans or computer vision software. There are uncertainty errors in the "just collapsed" state;

[0011] (5). The field of view of the existing devices is large, and it is difficult to measure the pressure of small varicose veins;

[0012] (6). Measurement of the influence of esophageal peristalsis: the existing devices are mostly based on PC processing video data, the processing process is long, and some even post-processing. When it is found that esophageal peristalsis affects the measurement data, it is too late to measure again

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