Controlled release vena cava filter and processing method thereof

Abstract

The invention relates to a controlled release vena cava filter and a processing method thereof. The vena cava filter comprises a body and a conveying steel cable, wherein the front end of the conveying steel cable is connected with an embolus head with screw rods. The vena cava filter is characterized in that a tail pipe body of the body is provided with a plurality of recessed rectangular pieces; and the recessed rectangular pieces form spiral guide bulges matched with external threads of the screw rods in the tail pipe body. The vena cava filter has the following beneficial effects: the spiral guide bulges matched with the external threads of the screw rods of the embolus head are directly processed on the tail pipe body of the body; a connecting part for controllable connection is manufactured on the tail pipe body by utilizing the nickel-titanium alloy pipes which are used for manufacturing the body, thus avoiding corrosion, shedding and the like caused because the connecting partand the body adopt different materials; and the vena cava filter has the advantages of reasonable structure, simpleness and reliability in connection, convenience in operation and use and high safetyperformance.

Description

technical field [0001] The invention relates to a medical device, in particular to a controllable release vena cava filter and a processing method thereof. Background technique [0002] As we all know, pulmonary embolism is one of the sudden diseases with high fatality rate. About 75% to 90% of the emboli causing pulmonary embolism originate from the lower limbs and pelvic veins. A filter device is placed below the level of the opening of the renal vein to intercept the blood The free emboli can effectively prevent the occurrence of pulmonary embolism. In recent years, this technology has been gradually promoted and popularized in China. [0003] At present, vena cava filters can be divided into three types: permanent implantation, temporary implantation and permanent temporary integration. Among them, the most widely used and most representative vena cava filter minimizes the impact of thrombus on the pulmonary circulation, but with the promotion of vena cava filter in cli...

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Problems solved by technology

However, the method of realizing the controllable release technology is to weld a threaded bolt head inside the pipe to realize the threaded connection. Due to the poor machinability of Nitinol alloy, it is difficult to process threads on Nitinol alloy materials, so the threaded bolt head The material is stainless steel, which is different from the nickel-titanium alloy material of the filter

However, there are electrochemical reactions between different materials, and corrosion is prone to occur after implantation in the body. The longer the time, the more severe the corrosion will be, and the threaded bolt head will easily fall off from the filter, so the effect is not ideal.

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