A convertible vena cava filter compatible with MRI

Abstract

The invention discloses a convertible vena cava filter compatible with nuclear magnetic examination, comprising a support element, a filter element and a locking element, the filter element is arranged inside the support element, the filter element is fixedly connected to the lower end of the support element, and the filtering The upper end of the element is closed by a locking element. The filter is equipped with a catheter delivery system or an expansion delivery system. After the thrombolytic therapy is completed, the locking element is opened, and the filter element is naturally converted into a support element, realizing the process of converting the filter to a stent. Through the above method, the present invention is compatible with nuclear magnetic resonance examination, and at the same time, it innovates in the design of the device, and designs a thrombus filter with better performance. The thrombus filter can effectively improve the blood flow washing effect, and the filter can be converted into a bracket It overcomes the possible complications of permanent filters and the possible damage to the vena cava intima of retrievable filters, and does not cause blood coagulation, is not easy to corrode, and can be implanted in the body for a long time.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a device for filtering thrombus in the vena cava of a human body. After the device is placed in the vena cava of the human body, it filters blood to capture the shed emboli and prevent embolism from occurring, so as to achieve the purpose of preventing and treating vascular embolism diseases. Background technique [0002] With the continuous development of modern medical technology, the embolism filter built into the human body is an effective means to prevent blood vessel embolism, and it is being continuously used in clinical treatment and has achieved good results. Pulmonary thromboembolism is a serious complication after deep vein thrombosis, and the use of heparin can effectively alleviate the disease, but in some cases, a mechanical thrombus filter must be placed in the inferior vena cava to prevent emboli from traveling along the vein Uplink, prevention or reduction of pulm...

AI Technical Summary

Problems solved by technology

There are still some problems with the vena cava filter currently on the market: the permanent filter (invention: ZL03200732.9; invention: ZL03266456.7) can only be placed permanently and cannot be taken out, and corresponding complications may occur for a long time, which is difficult for practical application Brings a lot of limitations, and the protective effect of the filter is also short-term

The retrievable filter (invention patent publication number: CN102178569A; invention patent publication number: CN1515326A) cannot guarantee that the filter can be recovered; the intima of the inferior vena cava may be damaged during the recovery process; there is a time limit for recovery; The thrombus must be removed through secondary intervention, otherwise long-term persistence may lead to problems such as blood flow disturbance

The filter element of the convertible filter (invention patent publication number: CN101491465A) is a degradable material. After the thrombolytic therapy is completed, the filter element will degrade by itself, which may cause thrombus loss and cause arterial thromboembolism.

Moreover, at present, most filters are mainly made of nickel-titanium alloy, stainless steel and other materials, so they can only be implanted temporarily, otherwise the patient carrying the filter will not be able to perform MRI, MRI and other examinations, which limits its use.

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