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filter

A filter, filter screen technology, applied to the filter. It can solve the problems of embedding, shortening the recovery period of temporary filters, and damage to the inner wall of blood vessels, so as to achieve the effect of less damage.

Active Publication Date: 2019-05-31
LIFETECH SCI (SHENZHEN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the temporary filter, it is clinically required that it can be stably maintained at the implantation position after being implanted in the inferior vena cava, and must not be turned over or tilted; moreover, the part of the filter that adheres to the vessel wall must not excessively stimulate the rapid proliferation of the vascular endothelial tissue in order to Avoid embedment of the filter by vascular endothelial tissue, which shortens the return period of the temporary filter and severely damages the inner wall of the blood vessel when it is removed from the body

Method used

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Examples

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Embodiment 1

[0044] The main body of the filter is cut and shaped from a nickel-titanium tube with an outer diameter of 0.2-4mm. It can be understood that the filter can also be braided and shaped by nickel-titanium wire with an outer diameter of 0.05-0.8 mm or a nickel-titanium flat belt with a width of 0.05-0.5 mm and a length of 0.15-1 mm. The filter has superelastic and self-expanding properties.

[0045] see Figure 1a and Figure 1b , the filter 100 includes a main body 10, the main body 10 has a proximal end 101 and a distal end 102, the main body 10 includes a first filter screen 11 located between the proximal end 101 and the distal end 102 and adjacent to the proximal end 101 , the second filter screen 12 adjacent to the distal end 102 and the support assembly 13 between the first and second filter screens 11 and 12 . When the filter 100 is naturally released in the blood vessel, the first filter 11 and the second filter 12 are used to filter the thrombus in the blood vessel; ...

Embodiment 2

[0064] see Figure 6a and Figure 6b The structure of the filter 200 of this embodiment is substantially the same as the structure of the filter 100 of the above-mentioned embodiment 1. The filter 200 includes a first filter screen 21 located between the proximal end 201 and the distal end 202 and adjacent to the proximal end 201, The second filter screen 22 adjacent to the distal end 202 and the support assembly 23 located between the first and second filter screens 21 , 22 . The difference lies in that the structure of the support assembly 23 is different from that of the support assembly 13 in the first embodiment.

[0065]The supporting assembly 23 includes a plurality of supporting units including a plurality of first supporting rods 231 and at least one second supporting rod 232 . The structure of the first support rod 231 is the same as that of the first support rod 131 in Embodiment 1, and the first support rod 231 extends roughly along a direction parallel to the lo...

Embodiment 3

[0071] see Figure 7 The structure of the filter 300 of embodiment 3 is the same as that of the filter 100 of embodiment 1, the difference is that the main body 30 of the filter 300 only includes a The first filter 31 of 301 and the support assembly 33 connected to the first filter 31 and adjacent to the distal end 302, the filter 300 does not include the second filter, that is, the filter 300 is a one-way open structure.

[0072] In this embodiment, the number of multiple support units of the support assembly 33 is six, and the six support units are all first support rods 331, and each first support rod 331 is roughly along a direction parallel to the longitudinal central axis of the filter 300 extend. The length of the projection of each first support rod 331 on a plane parallel to the longitudinal central axis of the filter 300 is 15.7mm. In the naturally released and uncompressed state, the natural length L of the filter 300 is 55mm, that is, each first support rod 331 T...

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Abstract

The invention discloses a filter, which includes a main body with a proximal end and a distal end, the main body includes a first filter net located between the proximal end and the distal end and adjacent to the proximal end, and a plurality of filter nets respectively connected to the first filter The net is connected and is all positioned at the first support bar between the first filter screen and the far-center end; the first support bar extends roughly along the direction parallel to the longitudinal central axis of the filter, and each first support bar is parallel to the longitudinal direction of the filter The ratio of the projection length in the plane of the central axis to the natural length of the filter is greater than or equal to 1 / 11 and less than or equal to 3 / 4. After the filter of the present invention is naturally released, it can be stably and reliably placed in the blood vessel, and it is not easy to tilt, and the damage to the inner wall of the blood vessel is small when the filter is taken out.

Description

technical field [0001] The invention relates to an implanted medical device, in particular to a filter. Background technique [0002] Pulmonary embolism is a common disease with a high mortality rate. According to statistics, the mortality rate of untreated pulmonary embolism is 20%-30%, and the annual new cases account for about 0.2% of the population. With a population of 1.35 billion in my country, there are about 2.7 million new patients every year. [0003] All kinds of blood clots in the systemic circulation can cause pulmonary embolism. There are many factors for the formation of blood clots, including trauma or fracture, trauma, major surgery, extensive burns, pregnancy, childbirth, prolonged illness in bed, long-distance driving or Sedentary sitting on the plane, long-term sitting and squatting, etc. can slow down venous blood flow, blood stasis, or increase platelets and coagulation factors, enhance blood adhesion, and form thrombus. These thrombi generally adher...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61F2/01
CPCA61F2/0108
Inventor 李安宁陈卓
Owner LIFETECH SCI (SHENZHEN) CO LTD