Plaque removal device

1. A plaque removal device, comprising,

a push catheter ( 1 ), a plaque scraping stent ( 2 ), a support tube ( 3 ), an elastic filter membrane ( 4 ), a guide catheter ( 5 ), and a handle ( 6 ), wherein the plaque scraping stent ( 2 ) is a mesh structure sleeved outside the support tube ( 3 ), a distal end of the plaque scraping stent ( 2 ) is fixed on a distal end of the support tube ( 3 ), a proximal end of the plaque scraping stent ( 2 ) is fixed on a distal end of the push catheter ( 1 ), the support tube ( 3 ) is sleeved inside the push catheter ( 1 ), and a distance between the distal end of the push catheter ( 1 ) and the distal end of the support tube ( 3 ) is adjusted by the handle ( 6 ), so as to control an outer diameter of the plaque scraping stent ( 2 ) to be varied; wherein a surface of the plaque scraping stent ( 2 ) is provided with sharp edges for providing effective cutting; position of the plaque scraping stent ( 2 ) is changed by pushing, pulling, and rotating the handle ( 6 ), thereby cutting the plaque, resulting plaque fragments are collected in the elastic filter membrane ( 4 ) provided in the plaque scraping stent ( 2 );

wherein the handle ( 6 ) comprises a luer taper ( 61 ), a safety lock ( 62 ), a slider device ( 63 ), a spring pressing cover ( 64 ), a screw ( 65 ) and an upper and lower front handle ( 66 );

wherein an inner surface of the upper and lower front handle ( 66 ) is bonded to the proximal end of the guide catheter ( 5 );

the proximal end of the support tube ( 3 ) passes through the guide catheter ( 5 ) and is fixedly connected to an inner surface of the screw ( 65 ); the slider device ( 63 ) is in thread connection with an outer surface of the screw ( 65 ), the slider device ( 63 ) is rotated to drive the screw ( 65 ) to move axially, and thus to drive the support tube ( 3 ), the plaque scraping stent ( 2 ) and the push catheter ( 1 ) to move axially;

the proximal end of the push catheter ( 1 ) passes through the guide catheter ( 5 ) into the handle ( 6 ), so as to be contact with a distal end of the screw ( 65 ); when the plaque scraping stent ( 2 ) moves to fully expose from the guide catheter ( 5 ), the proximal end of the push catheter ( 1 ) is in fixed coordination with the spring pressing cover ( 64 ), by pushing the spring pressing cover ( 64 ), the push catheter ( 1 ) moves axially with respect to the support tube ( 3 ) to change the outer diameter of the plaque scraping stent ( 2 ).

2. The plaque removal device of claim 1 , wherein the plaque removal device ( 2 ) comprises a proximal stent ( 21 ), a lumbar stent ( 22 ) and a distal stent ( 23 ); wherein the proximal stent ( 21 ) and the distal stent ( 23 ) have a conical net structure, each of the proximal stent ( 21 ) and the distal stent ( 23 ) comprises 3-6 wide support rods ( 211 ), wherein the wide support rods ( 211 ) are distributed in a central symmetry manner, two thin support rods ( 212 ) extend from the wide support rods ( 211 ), 12, 16, 20 or 24 connection points are formed at junctions of the thin support rods ( 212 ) and the lumbar stent ( 22 ); the lumbar stent ( 22 ) has a tubular net structure, and comprises 12-24 diamond-shaped lumbar grids.

3. The plaque removal device of claim 1 , wherein when the distance between the distal end of the push catheter ( 1 ) and the distal end of the support tube ( 3 ) is less than a farthest distance, that is, when the plaque scraping stent ( 2 ) is in an expanded state, an angle between two adjacent wide support rods ( 211 ) is a first opening angle ∠ 1 , wherein the first opening angle is in a range of 5° to 20°; an angle between two adjacent thin support rods ( 212 ) is a second opening angle ∠ 2 , wherein the second opening angle is in a range of 20° to 50°; an angle of the lumbar grids is a third opening angle ∠ 3 , wherein the third opening angle is in a range of 20° to 50°.

4. The plaque removal device of claim 1 , wherein the plaque scraping stent ( 2 ) is an integral part which is carved from a nitinol tube, wherein the nitinol tube has an outer diameter of 1.4 mm and a length of 10 mm to 50 mm.

5. The plaque removal device of claim 1 , wherein the elastic filter membrane ( 4 ) covers an inner wall of the distal stent ( 23 ), and is fixed by stitching, bonding or welding.

6. The plaque removal device of claim 1 , wherein the elastic filter membrane ( 4 ) is made of PET or ePTFE material, the elastic filter membrane ( 4 ) is formed by cross weaving or sinusoidal weaving, wherein the elastic filter membrane ( 4 ) has a mesh size of 50 μm to 250 μm, and has a thickness of 10 μm to 200 μm.

7. The plaque removal device of claim 1 , wherein the push catheter ( 1 ) is made of metal, non-metal or metal-non-metal composite tube with good flexibility and strong support.