A thrombus filtering device for surgery

Abstract

The present invention relates to the technical field of medical devices, and in particular to a thrombus filtering device for surgery, comprising a filter layer, a filter layer support frame, a fixed support frame, and a control wire; the filter layer support frame is in a boat shape, and is used to support in a blood vessel; the filter layer covers the filter layer support frame, and is used to filter thrombi; the fixed support frame comprises a plurality of fixed supports respectively fixed to different sides of the filter layer support frame, so as to support the blood vessel wall to assist the stable support of the filter layer support frame; the plurality of fixed supports are respectively connected with control wires, and the control wires are used to pull the fixed supports to adjust the positions of the fixed supports. The thrombus filtering device for surgery of the present invention can help the operator to place it stably and quickly at a predetermined position in the blood vessel, and can be adjusted when the placement position is inappropriate, thereby reducing the difficulty of the operation and improving the success rate of the operation.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a thrombus filtering device for surgery. Background Art

[0002] In vascular interventional treatment and valve repair surgery, almost all patients have the release of thrombogenic substances at the stenotic lesions or the shedding of fine tissues during the valve repair process, which can lead to distal vascular embolism and obstruction of distal blood flow perfusion. After successful treatment, lipid fragments, matrix components, endothelial cells, inflammatory cells, platelets and leukocyte adhesion in the plaque can form emboli, enter the distal blood vessels along the direction of blood flow, block the blood supply of important organs such as the brain and heart, and affect the patient's immediate or long-term prognosis. A thrombus filter is a system that can filter thrombi or plaques. The use of a thrombus filter can greatly improve the success rate of surgery. The prior art, such as the patent document with application number 201721320118.8, discloses a thrombus protection device. It is set at a predetermined position in the blood vessel and is used to filter thrombi. The thrombus protection device includes a skeleton and a filter screen. The skeleton supports the filter screen at a predetermined position in the blood vessel, and the filter screen can filter thrombi. The skeleton includes a main frame and a first support portion and a second support portion connected to the main frame, the first support portion and the second support portion extend to different sides of the main frame, and the main frame, the first support portion and the second support portion are respectively used to fit the inner wall of the blood vessel at different positions. When the structure adopts the commonly used memory alloy, it is difficult to place it during the process of releasing and restoring the deformation during surgery, resulting in unreasonable placement, and the skeleton cannot be effectively supported to resist the impact of blood flow, and even misplacement exerts excessive pressure on the blood vessel, causing additional damage to the blood vessel.

[0003] In view of the above technical problems, it is necessary to improve them. Summary of the invention

[0004] The purpose of the present invention is to provide a thrombus filtering device for surgery in view of the defects of the prior art.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A thrombus filtering device for surgery, the thrombus filtering device includes a filter layer, a filter layer support frame, a fixed support frame, and a control wire; the filter layer support frame is in a boat shape and is used to be supported in a blood vessel; the filter layer covers the filter layer support frame and is used to filter thrombi; the fixed support frame includes a plurality of fixed supports respectively fixed to different sides of the filter layer support frame to abut against the blood vessel wall to assist in the stable support of the filter layer support frame; the plurality of fixed supports are respectively connected with control wires, and the control wires are used to pull the fixed supports to adjust the positions of the fixed supports.

[0007] As a preferred solution, a wire control bracket is provided on the filter layer support frame, and the wire control bracket is used for passing the control wire around to change the direction of the control wire tension.

[0008] As a preferred solution, the end of the fixing bracket abutting against the blood vessel wall has texture to increase friction.

[0009] As a preferred solution, the filter layer is a multi-layer filter layer structure.

[0010] As a preferred solution, the multi-layer filter layer includes filter layers with different filtering accuracy, the material includes a combination of one or more of filter screens and filter membranes, and the filter layer also carries one or more drugs.

[0011] As a preferred solution, each filter layer of the multi-layer filter layer is respectively connected to a mesh-changing wire, and the mesh-changing wire is used to pull the connected filter layer to peel it off from the multi-layer filter layer.

[0012] As a preferred solution, there are two fixed brackets in an eight-shaped shape, including an upper fixed bracket and a lower fixed bracket respectively fixed to both sides of the middle part of the filter layer support frame; the tops of the eight-shaped upper and lower fixed brackets are respectively connected to their own control wires, and the bottoms are respectively connected to both sides of the middle part of the filter layer support frame.

[0013] As a preferred solution, the wire control bracket is placed at the end of the filter layer bracket, and the wire control bracket is shaped like an 8. The control wires of the upper fixed bracket and the lower fixed bracket respectively pass through the two 8-shaped circles of the wire control bracket and fold back to the other end of the filter layer bracket.

[0014] As a preferred embodiment, the filter layer support frame is composed of 2-10 elastic memory material wires, and the elastic memory material wires are composed of one or more combinations of nickel-titanium wire, stainless steel wire, polyurethane, polylactic acid and its copolymer modified body, carbon fiber, glass fiber, Kevlar fiber; the connection method between the filter layer support frame and the fixed bracket includes any one of welding, one-piece molding, and fixing part connection.

[0015] As a preferred solution, the wire diameter of the control wire is less than 0.1 mm, and the material of the control wire is one or more combinations of nickel-titanium alloy wire, stainless steel wire, carbon fiber, and glass fiber.

[0016] Compared with the prior art, the thrombus filtering device of the present invention can help the surgeon to place it stably and quickly at a predetermined position in the blood vessel, and can be adjusted when the placement position is inappropriate. The multi-layer filter layer can effectively filter the thrombus, and the filter layer of the filter layer can be replaced during the operation, thereby reducing the difficulty of the operation and improving the success rate of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a thrombus filtering device for surgery according to Embodiment 1 of the present invention;

[0018] Figure 2 It is a front view of a thrombus filtering device for surgery according to the first embodiment of the present invention;

[0019] Figure 3 A schematic diagram of a blood vessel at the aortic arch where a thrombus filtering device for surgery according to the first embodiment of the present invention is placed;

[0020] Figure 4 This is a schematic diagram of the placement of the thrombus filtering device for surgery according to the first embodiment of the present invention at the aortic arch;

[0021] Figure 5 This is a schematic diagram of a thrombus filtering device for surgery according to the second embodiment of the present invention when the filter layer material is a filter membrane;

[0022] Figure 6 This is a schematic structural diagram of a connection method between a filter layer support frame for surgery and a fixed support frame in the form of a steel sleeve according to a third embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of a thrombus filtering device for surgery according to a fourth embodiment of the present invention, in which the filtering layer is a multi-layer filtering layer structure;

[0024] Figure 8 This is a schematic structural diagram of a thrombus filtering device for surgery according to a fifth embodiment of the present invention;

[0025] Wherein: 100. Thrombus filtering device; 101. Filter layer support frame; 102. Upper fixed support frame; 103. Lower fixed support frame; 104. Filter screen with pores less than 0.15 square millimeters; 105. Control wire; 106. 8-shaped ring; 107. Sheath; 108. Connection between the fixed support frame and the filter layer support frame; 109. Thrombus; 110. Innominate artery; 111. Left common carotid artery; 112. Left subclavian artery; 113. Blood flow; 114. Replacement of mesh wire; 115. Steel sleeve. DETAILED DESCRIPTION

[0026] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0027] The purpose of the present invention is to provide a thrombus filtering device for surgery in view of the defects of the prior art.

[0028] Embodiment 1:

[0029] like Figure 1-4 As shown, the thrombus filtering device 100 of this embodiment is used to filter the thrombus 109 during the operation. In the specific implementation process, the thrombus filtering device 100 is sent to the pre-placed position of the blood vessel by the sheath tube 107, and is pushed out and fixed. The thrombus filtering device 100 includes a filter layer, a filter layer support frame 101, a fixed support, and a control wire 105. The filter layer support frame 101 is in a boat shape and is used to support in the blood vessel; the filter layer covers the filter layer support frame and is used to filter the thrombus 109; the fixed support includes a plurality of fixed supports respectively fixed to different sides of the filter layer support frame 101 to support the blood vessel wall to assist the stable support of the filter layer support frame 101; the plurality of fixed supports are respectively connected with control wires 105, and the control wires 105 are used to pull the fixed support to adjust the position of the fixed support.

[0030] Specifically, the filter layer support frame 101 is composed of four elastic memory material wires, which converge together at the front end of the device, and then separate and converge along the direction of the tail end and finally converge together. The entire outer shape of the support frame presents a shape similar to a ship. More specifically, in order to better cooperate with the blood vessels, the device can have a certain shape of deformation. The filter layer support frame 101 has a certain rigidity so that it can completely unfold the filter layer. The filter layer support frame 101 is made of memory material nickel-titanium alloy wire, so that it can recover and maintain its original shape within a certain temperature range; preferably, the filter layer support frame 101 can be composed of 2, 3, 5-10 or more elastic memory material wires, and the structure can be a mesh telescopic or vertical fence type. The elastic memory material wire is composed of one or more combinations of stainless steel wire, polyurethane, polylactic acid and its copolymer modified body, carbon fiber, glass fiber, and Kevlar fiber.

[0031] There are two fixed brackets, which are in the shape of an eight-shaped figure, the part of the eight-shaped figure is the bottom, and the part of the eight-shaped figure is the top, including an upper fixed bracket 102 and a lower fixed bracket 103 respectively fixed to both sides of the middle of the filter layer support frame 101; the tops of the upper fixed bracket 102 and the lower fixed bracket 103 are respectively connected to their respective control wires 105, and the bottoms are respectively connected to both sides of the middle of the filter layer support frame 101, and the fixed bracket and the filter layer support frame 101 can use the same material, such as the same nickel-titanium alloy wire, and two nickel-titanium alloy wires are selected to be bent to form two fixed brackets, and the connection part 108 of the fixed bracket and the filter layer support frame is welded or integrally formed with the same material. Preferably, the abutting end of the fixed bracket and the blood vessel wall has a pattern to increase the friction, that is, the eight-shaped top of the fixed bracket has a pattern made to increase the friction, so that the device can be placed more securely.

[0032] The top of the upper fixed bracket 102 and the lower fixed bracket 103 are connected to their respective control wires 105, and the control wire 105 is pulled externally through the sheath tube 107 to release the memory elasticity of the fixed bracket itself, so as to effectively adjust the angle and position of the fixed bracket; preferably, a control wire 105 bracket is provided on the filter layer support frame 101, and the control wire 105 bracket is used for the control wire 105 to pass through and around, so as to change the pulling direction of the control wire 105. For example, a circular ring 106 in the shape of a figure 8 is provided at the end of the filter layer bracket, and the control wires 105 of the upper fixed bracket 102 and the lower fixed bracket 103 respectively pass through the two circles of the figure 8 of the control wire 105 bracket and turn back to the other end of the filter layer bracket and pass through the sheath tube 107, so as to change the pulling direction of the control wire 105, cooperate with the elastic restoring force in different directions of the fixed bracket, or better, directly connect multiple control wires 105 to each bracket, and multiple control wires 105 cooperate with the control wire 105 brackets in different directions to provide pulling forces in different directions, so as to adjust the position from different directions. Preferably, the control wire 105 support can be a plurality of circular rings distributed on the filter layer support, or a circular ring with a notch, and the circular ring with a notch pulls the control wire 105 out of the notch when the operation is completed. Preferably, in order to reduce the surgical wound, the wire diameter of the control wire 105 is controlled to be less than 0.1 mm. In order to improve the surgical accuracy, the control wire 105 is preferably made of an inelastic material. The material of the control wire 105 is selected from one or more combinations of nickel-titanium alloy wire, stainless steel wire, carbon fiber, and glass fiber. Nickel-titanium alloy wire can be used, stainless steel wire or a wire made of a polymer material can also be used. Preferably, in order to distinguish different control wires 105, multiple control wires 105 are marked with colors or text.

[0033] The filter layer is used to filter the thrombus 109. For example, a filter mesh 104 with a pore size less than 0.15 square millimeters is selected. The filter mesh is made of nickel-titanium wire, implantable stainless steel wire, or wire made of polymer material. The filter mesh is fixed to the filter layer support frame 101 by suturing. The filter mesh can be coated or wrapped with one or more drugs to reduce the formation of thrombus 109.

[0034] Embodiments and methods of use of the thrombus filtering device 100:

[0035] In an embodiment, the thrombus filtering device 100 is placed in Figure 3 , Figure 4 At the aortic arch shown in FIG. 1 , under normal circumstances, there is no thrombus 109 in the blood, and blood flows from the innominate artery 110, the left common carotid artery 111, and the left subclavian artery 112 to the important organs of the human body. Figure 3 As shown in FIG. 1 , when there is a thrombus 109 in the blood, the thrombus 109 may enter the important organs of the human body through the innominate artery 110 , the left common carotid artery 111 , and the left subclavian artery 112 , causing serious damage to the human body.

[0036] When the device of the present invention is used, the thrombus 109 can be effectively prevented from entering the vital organs of the human body, thereby causing serious damage to the human body. When in use, the sheath tube 107 transports the thrombus filtering device 100 to the aortic arch, and then the device is pushed out from the sheath tube 107. Since the filter layer support frame 101 is composed of shape memory material nickel titanium alloy wire, it will be unfolded into the previous shape. The unfolding of the filter layer support frame 101 makes the filter screen sutured on it also unfolded, and the upper and lower fixed supports 103 are also unfolded. The thrombus filtering device 100 is adjusted so that the eight-shaped ring fits on the blood vessel wall. The control wire 105 of the upper fixed support 102 is pulled to adjust the position of the upper fixed support 102 so that the upper fixed support 102 is located between the innominate artery 110 and the left common carotid artery 111. Under the action of elasticity, the top of the upper fixed support 102 is fixed between the innominate artery 110 and the left common carotid artery 111. The texture at the head end of the upper fixed support 102 increases the friction force and makes the fixation more stable. Then pull the control wire 105 to adjust the position of the lower fixed support 103, so that the lower fixed support 103 is against the inner wall of the aortic arch, and the pattern on the top of the lower fixed support 103 makes the fixation more stable. The thrombus filtering device 100 can be supported at four points to ensure that it can still be stably fixed at the aortic arch under the impact of blood flow 113, and can effectively prevent the thrombus 109 formed during the operation from flowing to the important organs of the human body. When the operation is completed, the upper and lower fixed support frames are retracted by adjusting the control wire 105, and then the thrombus filtering device 100 is withdrawn, and the thrombus 109 formed during the operation is taken out of the body.

[0037] The thrombus filtering device 100 of this embodiment can help the operator to place it stably and quickly at a predetermined position in the blood vessel, and can be adjusted when the placement position is inappropriate, thereby reducing the difficulty of the operation and improving the success rate of the operation.

[0038] Embodiment 2:

[0039] The thrombus filtering device for surgery in this embodiment is different from that in the first embodiment in that:

[0040] like Figure 5 As shown, the filter layer in this embodiment no longer adopts a filter mesh structure woven from various materials, but adopts a filter membrane with a membrane structure with good filtering performance. The filter membrane can be prepared from a microporous filter membrane or a spun membrane material.

[0041] Compared with the first embodiment, the structure of the filter membrane is easier to be used as a drug carrier and can filter smaller thrombi. Preferably, the filter layer can also be a combination of a filter screen and a filter membrane to give full play to the advantages of each material.

[0042] For other structures, please refer to Example 1.

[0043] Embodiment three:

[0044] The thrombus filtering device for surgery in this embodiment is different from that in the first embodiment in that:

[0045] like Figure 6 As shown, the upper and lower fixing brackets in this embodiment are no longer connected to the filter layer support frame by welding, but are connected by a steel sleeve 115. Compared with the connection method of the first embodiment using the steel sleeve 115, the technical difficulty of welding nickel-titanium alloy is avoided, and the connection is more convenient and quick. Preferably, the fixing piece can be made of other materials or structures.

[0046] For other structures, please refer to Example 1.

[0047] Embodiment 4:

[0048] The thrombus filtering device for surgery in this embodiment is different from that in the first embodiment in that:

[0049] like Figure 7 As shown, in this embodiment, the filter layer is composed of three layers, the bottom layer is a small-pore mesh, the middle layer is a medium-pore mesh, and the top layer is a large-pore mesh. The filter effect can be enhanced by graded filtration through multiple filter layers with different filtration accuracies. Preferably, the filter layer can be two or more than three layers.

[0050] For other structures, please refer to Example 1.

[0051] Embodiment five:

[0052] The thrombus filtering device for surgery in this embodiment is different from that in the fourth embodiment in that:

[0053] like Figure 8 As shown, each filter layer of the multi-layer filter layer is respectively connected with a mesh-changing wire 114, and the mesh-changing wire 114 is used to pull the connected filter layer to peel it off from the multi-layer filter layer. During use, the mesh-changing wire 114 connected to the filter can be used to change the mesh according to the thrombus filtering situation, so that the filter layer blocked by the thrombus can be retrieved and then filtered by the next filter layer; the arrangement of different filter layers can be graded from sparse to dense for filtering, thereby reducing the phenomenon that small thrombi do not catch the net due to blockage by large thrombi.

[0054] Table 1 below is a comparison table of the filtering effects of the traditional single-layer filter and the multi-layer filter of this embodiment on small blood clots:

[0055]

[0056] Table 1

[0057] It can be concluded from Table 1 that the filtering effect of the multi-layer filter on thrombus is significantly better than that of the single-layer filter on thrombus.

[0058] For other structures, please refer to Example 4.

[0059] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A thrombus filtering device for surgery, characterized in that: The thrombus filtering device comprises a filter layer, a filter layer support frame, a fixed support frame, and a control wire; the filter layer support frame is in a boat shape and is used to be supported in a blood vessel; the filter layer is covered on the filter layer support frame and is used to filter thrombi; the fixed support frame comprises a plurality of fixed supports respectively fixed to different sides of the filter layer support frame to abut against the blood vessel wall to assist in the stable support of the filter layer support frame; the plurality of fixed supports are respectively connected with control wires, and the control wires are used to pull the fixed supports to adjust the positions of the fixed supports; The filter layer support frame is provided with a wire control bracket, and the wire control bracket is used for passing the wire control to change the direction of the wire control tension; The filter layer is a multi-layer filter layer structure, and each filter layer of the multi-layer filter layer is respectively connected with a mesh-changing wire, and the mesh-changing wire is used to pull the connected filter layer to peel it off from the multi-layer filter layer.

2. A thrombus filtering device for surgery according to claim 1, characterized in that: The end of the fixing bracket abutting against the blood vessel wall has textures to increase friction.

3. A thrombus filtering device for surgery according to claim 1, characterized in that: The multi-layer filter layer includes filter layers with different filtering precisions, and the material includes a combination of one or more of a filter screen and a filter membrane. The filter layer also carries one or more drugs.

4. A thrombus filtering device for surgery according to claim 1, characterized in that: There are two fixed brackets in an eight-shaped shape, including an upper fixed bracket and a lower fixed bracket respectively fixed to both sides of the middle of the filter layer support frame; the tops of the upper fixed bracket and the lower fixed bracket are respectively connected to their own control wires, and the bottoms are respectively connected to both sides of the middle of the filter layer support frame.

5. A thrombus filtering device for surgery as claimed in claim 4, characterized in that: The wire control bracket is placed at the end of the filter layer bracket, and the wire control bracket is in an 8-shape. The control wires of the upper fixed bracket and the lower fixed bracket pass through the two 8-shaped circles of the wire control bracket and fold back to the other end of the filter layer bracket.

6. A thrombus filtering device for surgery according to claim 5, characterized in that: The filter layer support frame is composed of 2-10 elastic memory material wires, and the elastic memory material wires are composed of one or more combinations of nickel-titanium wire, stainless steel wire, polyurethane, polylactic acid and its copolymer modified body, carbon fiber, glass fiber, Kevlar fiber; the connection method between the filter layer support frame and the fixed bracket includes any one of welding, one-piece molding, and fixing part connection.

7. A thrombus filtering device for surgery according to any one of claims 1 to 6, characterized in that: The wire diameter of the control wire is less than 0.1 mm, and the material of the control wire is one or more combinations of nickel-titanium alloy wire, stainless steel wire, carbon fiber, and glass fiber.

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