Visceral layer biopsy needle

Abstract

The invention provides a visceral layer biopsy needle, which comprises a needle tube and an inner sleeve internally sleeved in the needle tube. The inner surface of the needle tube and the outer surface of the inner sleeve are respectively provided with an internal thread and an external thread which are matched mutually. A piston and a piston rod connected with the piston are arranged in the inner sleeve. A through hole is formed in the wall of the inner sleeve along the axial direction. A sampling cutter control rod is arranged in the through hole. One end of the sampling cutter control rod, which is close to a needlepoint, is fixedly connected with a crescent sampling cutter. The crescent sampling cutter is arranged on the ring-shaped wall of one end of the inner sleeve, which is closeto the needlepoint. The inner and outer sleeves are connected by the threads, so the visceral layer biopsy needle of the invention can make the inner and outer sleeves move relatively in the axial direction by selecting the inner and outer sleeves. Meanwhile, a piston mechanism is arranged in the inner sleeve, a negative pressure chamber can be formed and the visceral layer biopsy needle carries out adsorption on lesion tissues of the surface of a visceral layer by utilizing the principle of negative pressure traction and then cuts and separates the lesion tissues by using the sampling cutterso as to fulfill the aim of sampling.

Description

technical field [0001] The invention relates to a medical device, in particular to a visceral biopsy needle. Background technique [0002] Pleural or peritoneal effusion is a common clinical disease and often occurs. Because of its various causes, it is difficult to diagnose quickly and accurately, which in turn affects subsequent treatment, causing economic and health losses to patients and their families, and even delays in treatment. deterioration. At present, routine clinical diagnosis of etiology mainly relies on routine biochemistry of transpleural effusion, X-ray and CT, pleural effusion and sputum cytology, fiberoptic bronchoscopy, etc., which can assist in making etiological diagnosis for most patients, but there are still some patients who cannot be diagnosed. Such patients are often encountered in the Internet, and it is difficult to determine the etiology. According to literature reports, it is about 10% to 20%. [0003] Pleural biopsy has the advantages of sim...

AI Technical Summary

Problems solved by technology

However, the existing pleural biopsy also has many shortcomings and limitations: in the case of pleural effusion, the pleural lesions are not uniform, and the lesions are mostly limited to a certain part of the pleura or focal distribution. , it is highly suspected that malignant pleural effusion is not diffusely distributed on the pleura, and sometimes multiple biopsies in different parts are required to obtain a positive result

At present, the methods for obtaining peritoneal tissue samples include: laparotomy exploration and laparoscopic sampling. For these two techniques, patients have to bear the risk of anesthesia and surgery, and should not be widely used; the positive rate of ascites cytology is low; the traditional method Hook-needle peritoneal biopsy requires few tissues, high blindness, low diagnostic accuracy, and prone to complications such as injury and bleeding

On the other hand, peritoneal lesions vary in thickness, some are very thin and easy to penetrate by puncture; some peritoneal lesions are located deep in the viscera and difficult to penetrate

Therefore, it is difficult for the existing peritoneal biopsy needles to accurately and safely puncture the peritoneal tissue, nor can it ensure that the sample volume of peritoneal tissue is large enough without damaging the surrounding organs, such as intestines, etc.

The traditional pleural biopsy needle takes less material at one time, which also limits the accuracy. The false negative rate can reach more than 40%, and sometimes it even needs to take multiple samples, causing physical and economic losses to the patient.

Especially for biopsy sampling on the surface of the visceral layer, since the visceral layer cannot be pierced, it is extremely difficult to sample the surface of the visceral layer, and it is even impossible to sample through the pleural biopsy needle, which greatly limits the determination of the cause

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