Radioactive particle stent used for radiotherapy in cavity tumor

Abstract

The invention discloses a radioactive particle stent used for radiotherapy in a cavity tumor. The stent comprises a stent body 1 formed by weaving an alloy tube wire 3 and provided with an opening along a long axis, and radioactive particles 2, wherein the radioactive particles 2 are arranged in the alloy tube wire 3 with the opening. The stent is simple in structure, simple and convenient to prepare and convenient to use, can be prepared according to different specifications and types, is suitable for different tumor sizes, and realizes conformal therapy of the cavity tumor, so that the curative effect is improved and the injury to normal tissues is reduced. The radioactive particles are firmly clamped or bonded to different positions of the alloy tube wire with the opening, so that the falling probability of the radioactive particles is reduced. The radiation shielding of the wall of the alloy tube wire to the radioactive particles is reduced; the radioactivity utilization efficiencyis improved; and the cost is reduced.

Description

technical field [0001] The invention belongs to the field of medical devices, and in particular relates to a radioactive particle bracket used for intracavitary tumor radiotherapy. Background technique [0002] The biggest problem of cavity cancer is blockage. When the tumor cannot be removed by surgery or other means, radiotherapy can effectively inhibit the growth of the tumor. However, external irradiation has the disadvantages of discontinuous irradiation and large radiation dose. At present, medical stents have been widely used in clinical treatment of lumen stenosis. Ordinary medical stents only rely on the support force of the stent itself to open the narrow lumen, which plays a certain role in relieving it. However, the probability of restenosis is relatively low as the tumor grows. big. [0003] In recent years, a large number of clinical treatments have demonstrated the implantation of radioactive particles such as 125 I and others have achieved very good therape...

AI Technical Summary

Problems solved by technology

Its disadvantages are: (1) For a single stent, the position of the particle-loading tube is fixed and the number is limited, while the positions of the lesions of patients are different, and the size and shape of the lesions are different, and the positions and numbers of the radioactive particles to be placed are also different. Are not the same

(2) The position of the particle filling tube is prominent, and the local pressure is heavy, which is easy to cause local damage and bleeding

(3) The nickel-titanium alloy filling tube will shield part of the radiation intensity, and the radiation intensity to the tumor will be weakened, thus affecting the curative effect

(4) The preparation process is complex

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