阅读说明：本技术 一种用于血栓过滤的血管远端保护装置 (Blood vessel far-end protection device for filtering thrombus ) 是由 陈大凯 于 2020-06-24 设计创作，主要内容包括：本发明涉及医疗器械的技术领域,尤其涉及一种用于血栓过滤的血管远端保护装置,包括过滤层、过滤层支撑架、拉杆；所述过滤层呈锥形,用于捕捉血栓；所述过滤层支撑架设置于过滤层内,所述滤层支撑架用于支撑过滤层；所述拉杆与过滤层支撑架固定连接,所述拉杆用于控制过滤层支撑架的开角大小。本发明的血管远端保护装置能够稳定快捷地放置到血管预定位置处,能够有效的阻止血栓、固体颗粒流入到远端血管,并且在回收过程中能够有效避免已被收集的血栓或者颗粒再次洒落到血液中。(The invention relates to the technical field of medical instruments, in particular to a blood vessel far-end protection device for filtering thrombus, which comprises a filter layer, a filter layer support frame and a pull rod, wherein the filter layer support frame is arranged on the filter layer; the filter layer is conical and is used for capturing thrombus; the filter layer support frame is arranged in the filter layer and is used for supporting the filter layer; the pull rod is fixedly connected with the filter layer supporting frame and is used for controlling the opening angle of the filter layer supporting frame. The blood vessel far-end protection device can be stably and quickly placed at a preset position of a blood vessel, can effectively prevent thrombus and solid particles from flowing into the far-end blood vessel, and can effectively prevent collected thrombus or particles from being scattered into blood again in the recovery process.)

1. A blood vessel far-end protection device for filtering thrombus is characterized by comprising a filter layer, a filter layer support frame and a pull rod; the filter layer is conical and is used for capturing thrombus; the filter layer support frame is arranged in the filter layer and is used for supporting the filter layer; the pull rod is fixedly connected with the filter layer supporting frame and is used for controlling the opening angle of the filter layer supporting frame.

2. The distal vascular protection device for thrombus filtration of claim 1, wherein the filter layer scaffold comprises a star-shaped scaffold; the star-shaped support frame comprises a plurality of support rods, one end of each support rod of the plurality of support rods is fixedly connected with the conical bottom of the filter layer, the other end of each support rod of the plurality of support rods is connected with each other to form a connection point, and the connection point is fixedly connected with the pull rod.

3. The distal vascular protection device for thrombus filtration of claim 2, wherein the filter layer scaffold further comprises an annular scaffold, a side scaffold; the annular support frame is arranged in the middle of the filter layer in a conical shape, and the edge support frame is arranged on the side edge of the filter layer in the conical shape.

4. The distal vascular protection device for filtering thrombus of claim 1, further comprising a catheter and a sheath, wherein the pull rod is sleeved in the catheter; the catheter is sleeved in the sheath.

5. The distal vascular protection device for thrombus filtration according to claim 3, wherein the number of the support rods is 6-12, the diameter of each support rod is 0.3-0.8mm, and the material of each support rod comprises one or more of nickel titanium, stainless steel and carbon fiber; the material of the side supporting frames is nickel-titanium alloy, and the number of the side supporting frames is 2-4.

6. The distal vascular protection device for thrombus filtration of claim 1, wherein the filtration layer comprises one or more of a filter mesh, a filter membrane; one or more medicines are arranged on the filter layer.

7. The distal vascular protection device for thrombus filtration according to claim 6, wherein the material of the filter screen comprises one or more of nickel titanium wires, stainless steel wires, PTFE wires, PEEK wires; the material of the filtering membrane comprises one or more of a PTFE membrane, a PET membrane and a TPU membrane; the mesh size of the filter screen is less than or equal to 0.3mm²。

8. A distal vascular protection device for use in thrombus filtration according to claim 3 wherein the annular scaffold has a diameter of 0.3-0.8 mm; the annular support frame is made of nickel-titanium wires.

9. The distal vascular protection device for filtering thrombus of claim 1, wherein the material of the pull rod comprises one or more of stainless steel wire and nickel titanium wire, and the diameter of the pull rod is 1-1.5 mm.

10. The distal vascular protection device for thrombus filtration according to claim 4, wherein the catheter is an adjustable elbow, the inner diameter of the catheter is 2-2.3mm, and the outer diameter of the catheter is 2.5-3 mm.

Technical Field

The invention relates to the technical field of medical instruments, in particular to a blood vessel far-end protection device for filtering thrombus.

Background

In vascular interventional therapy and valve repair surgery, almost all patients have release of thrombus-causing substances at stenotic lesions or cause shedding of fine tissues during valve repair, and can cause embolism of far ends of blood vessels, so that perfusion of far ends of blood vessels is obstructed. After successful treatment, lipid fragments, matrix components, endothelial cells, inflammatory cells, platelets, leukocyte adhesion and the like in the plaque can form emboli, enter a distal blood vessel along the direction of blood flow, and cause unsmooth blood flow or completely block the blood flow. The thrombus filtering device is a system capable of filtering out thrombus or plaque, and the far-end protection device is placed at a fixed position before intervention operation, so that solid particles such as lipid fragments and thrombus falling off in the operation process are prevented from flowing into a far-end blood vessel to block the blood vessel.

The existing distal end protection apparatus is also mostly of an inverted cone structure, has good effect on collecting thrombus, but cannot be narrowed due to a wide mouth or is difficult in the narrowing process when the system is recovered. In addition, most of the existing distal end protectors are self-expandable structures, the shapes of the distal end protectors can be fixed only by extrusion with the vessel walls, the opening and closing angles can not be adjusted according to the diameters of different vessels, and expansion damage can still be caused to the tiny vessels.

For example, patent publication No. CN105662647A discloses a thrombus filter, which comprises a handle, a filtering umbrella for catching thrombus, a pushing catheter, and a folding device for folding the filtering umbrella; the filtering umbrella is of a netted funnel-shaped structure capable of elastically recovering, the neck of the filtering umbrella is fixedly connected with the pushing guide pipe, the pushing guide pipe is provided with an inner cavity along the axial direction, and the cavity enclosed by the filtering umbrella is communicated with the inner cavity of the pushing guide pipe; the folding device comprises a wire-collecting mechanism and a traction mechanism for drawing the wire-collecting action; the take-up line is connected with the opening part of the filtering umbrella and pulls the opening part to fold so that the filtering umbrella becomes a closed space; the traction mechanism is arranged in the inner cavity of the pushing conduit in a penetrating manner, extends towards the opening part of the filtering umbrella and is connected with the take-up wire; the pushing catheter and the traction mechanism are respectively connected with the handle, and the action of the pushing catheter and the action of the traction mechanism are controlled through the handle. Although the patent can effectively intercept the fallen plaque or embolus, the size of the opening and closing angle cannot be adjusted according to different vessel diameters, and the small vessels can still be subjected to expansion injury.

In view of the above technical problems, it is desirable to improve.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a blood vessel distal end protection device for filtering thrombus.

In order to achieve the purpose, the invention adopts the following technical scheme:

a blood vessel far-end protection device for filtering thrombus comprises a filter layer, a filter layer support frame and a pull rod; the filter layer is conical and is used for capturing thrombus; the filter layer support frame is arranged in the filter layer and is used for supporting the filter layer; the pull rod is fixedly connected with the filter layer supporting frame and is used for controlling the opening angle of the filter layer supporting frame.

Further, the filter layer support comprises a star-shaped support; the star-shaped support frame comprises a plurality of support rods, one end of each support rod of the plurality of support rods is fixedly connected with the conical bottom of the filter layer, the other end of each support rod of the plurality of support rods is connected with each other to form a connection point, and the connection point is fixedly connected with the pull rod.

Furthermore, the filter layer support frame also comprises an annular support frame and an edge support frame; the annular support frame is arranged in the middle of the filter layer in a conical shape, and the edge support frame is arranged on the side edge of the filter layer in the conical shape.

The pull rod is sleeved in the guide pipe; the catheter is sleeved in the sheath.

Further, the number of the support rods is 6-12, the diameter of each support rod is 0.3-0.8mm, and the material of each support rod comprises one or more of nickel titanium, stainless steel and carbon fiber; the material of the side supporting frames is nickel-titanium alloy, and the number of the side supporting frames is 2-4.

Further, the filtering layer comprises one or more of a filtering net and a filtering membrane; one or more medicines are arranged on the filter layer.

Further, the material of the filter screen comprises one or more of nickel titanium wires, stainless steel wires, PTFE wires and PEEK wires; the material of the filtering membrane comprises one or more of a PTFE membrane, a PET membrane and a TPU membrane; the mesh size of the filter screen is less than or equal to 0.3mm²。

Further, the diameter of the annular support frame is 0.3-0.8 mm; the annular support frame is made of nickel-titanium wires.

Furthermore, the material of the pull rod comprises one or more of stainless steel wires and nickel titanium wires, and the diameter of the pull rod is 1-1.5 mm.

Furthermore, the guide pipe is an adjustable bent pipe, the inner diameter of the guide pipe is 2-2.3mm, and the outer diameter of the guide pipe is 2.5-3 mm.

Compared with the prior art, the blood vessel far-end protection device can be stably and quickly placed at a preset position of a blood vessel, can effectively prevent thrombus and solid particles from flowing into the far-end blood vessel, and can effectively prevent collected thrombus or particles from being scattered into blood again in the recovery process.

Drawings

FIG. 1 is a schematic structural view of a distal protection device for filtering thrombus according to a first embodiment of the present invention;

FIG. 2 is a top view of a distal vascular protection device for thrombus filtration according to a first embodiment of the present invention;

FIG. 3 is a schematic view of a distal vascular protection device for thrombus filtration deployed in a blood vessel in accordance with a first embodiment of the present invention;

fig. 4 is a schematic view of a collecting and closing state of a blood vessel distal end protection device for filtering thrombus according to a first embodiment of the invention.

Wherein: 100. a distal protection device; 101. a conduit; 102. a pull rod; 103. a star-shaped support frame; 104. a filter layer; 105. an annular support frame; 106. a side support frame; 107. a sheath tube; 108. thrombosis.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

The invention aims to overcome the defects of the prior art and provides a blood vessel distal end protection device for filtering thrombus.