Device for indwelling and removing local internal radiation therapy for venous tumor thrombus

Abstract

The invention provides an instrument for local internal radiation for treating vein blood vessel cancer embolus and capable of being remained and taken out. The instrument includes a catheter puncturing to a vein blood vessel with cancer embolus via the jugular vein when in use; a guide filament in associated use with the catheter; a radiation structure arranged on the front part of the catheter and containing radioactive substance capable of performing internal radiation treatment. The headmost end of the catheter is a micro tip. A flow return preventing structure capable of preventing bloodflow return, allowing passing of the guide filament and not allowing passing of the radiation structure is arranged in front of the radiation structure arranged on the catheter, or two air outlets arearranged in two sides of the front end of the catheter. The diameter of the radiation structure is greater than or equal to the diameter of the guide filament. The diameter of each of the two air outlets is smaller than the diameter of the radiation structure. A fixing structure used for fixing the radiation structure on the front end of the catheter and a drawing structure used for taking out the fixing structure are arranged in the catheter. The fixing structure is arranged behind the radiation structure. According to the invention, risks that traditional particles are easy to get moved dueto blood flushing and embolism may occur can be avoided completely and a problem that the traditional particles cannot be taken out after being placed is also solved.

Description

technical field [0001] The invention belongs to medical devices in the field of interventional radiation, in particular to a surgical device for local radiotherapy of venous blood vessel tumor thrombi, and in particular to a local internal radiation therapy device for treating venous blood vessel tumor thrombi that can be placed and taken out. Background technique [0002] Hepatocellular carcinoma (HCC) is a primary liver cancer with a high mortality rate. It is the most common malignancy worldwide, especially in Asia, Africa and southern Europe. At present, the incidence of hepatocellular carcinoma (HCC) in my country is high, accounting for about half of all new cases in the world, and 10-40% of HCC patients have portal vein tumor thrombus. Once the main portal vein is involved by tumor thrombi, it will greatly increase the probability of tumor dissemination in the liver, and at the same time hinder the blood flow into the hepatic portal vein, which will lead to the deter...

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the problems of non-adjustable position of the particles in the treatment of portal vein tumor thrombi in the prior art, the particles cannot be replaced, and the risk of particles falling out, etc., the present invention provides a local internal radiotherapy device for treating venous tumor thrombi that can be indwelling and taken out

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