Artificial blood vessel thrombus removing device

Abstract

The utility model relates to an artificial blood vessel thrombus removing device which comprises an inner core, an inner sheath, an outer sheath, a hemostasis valve, a liquid supply device and an air bag filling device, and a liquid inlet and outlet guide pipe arranged at the front end of the inner sheath comprises a guide pipe wall and a net-shaped self-expansion type elastic memory alloy metal wire support. The defects of large trauma, high cost, low thrombus suction efficiency and the like existing in an existing artificial blood vessel thrombus treatment mode are overcome, the liquid inlet and outlet guide pipe is arranged at the front end of the inner sheath, the net-shaped self-expansion type elastic memory alloy metal wire support is arranged in the liquid inlet and outlet guide pipe, the net-shaped self-expansion type elastic memory alloy metal wire support can drive the liquid outlet end of the inner sheath to be unfolded when unfolded, and the thrombus suction efficiency is improved. Through operation cooperation of the two artificial blood vessel thrombus removing devices, the artificial blood vessel thrombus removing device has the advantages of being minimally invasive, convenient to use, economical and capable of efficiently removing artificial blood vessel arteriovenous fistula thrombus.

Description

Technical Field

[0001] The utility model relates to an artificial blood vessel thrombus removal device, which is applied in the field of medical devices for removing artificial blood vessel thrombus. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

[0003] Uremia is the terminal manifestation of chronic renal failure, and the incidence rate in my country is huge. Hemodialysis is the basis for the long-term survival of uremia patients. With the continuous consumption of autologous blood vessels, a large number of patients eventually need to use artificial blood vessels for dialysis. Thrombosis is one of the most common complications of artificial arteriovenous fistulas, which directly restricts their use time.

[0004] Currently, the main clinical treatments for thrombosis in prosthetic arteriovenous fistulas involve either incision followed by thrombectomy using a Forgaty thrombectomy catheter, or puncture and sheath placement followed by thrombectomy using an aspiration device such as the Angiojet, followed by combined intravascular treatments such as balloon dilatation. The former requires incision to expose the prosthesis, resulting in significant trauma, excessive bleeding, a long surgical time, and a slow recovery. The latter, on the other hand, is inefficient, requires expensive aspiration devices, carries a significant financial burden, and requires the combined use of thrombolytic drugs, which increases the risk of bleeding and makes it unacceptable to some patients.

[0005] Therefore, it is urgent to provide an artificial blood vessel thrombus removal device that is minimally invasive, convenient, economical and can effectively remove thrombi in artificial blood vessels such as arteriovenous fistulas. Utility Model Content

[0006] The current clinical methods for treating thrombi in artificial blood vessels such as arteriovenous fistulas have many defects such as large trauma, long operation time, low thrombus suction efficiency, and high cost. In order to overcome the shortcomings of the existing treatment methods, the utility model provides an artificial blood vessel thrombus removal device, which adopts a movable sleeve inner core, inner sheath and outer sheath structure, and an air bag is provided on the outer peripheral wall of the inner sheath near the liquid outlet end of the inner sheath, and a section of liquid inlet and outlet guide tube is provided at the front end of the inner sheath, and a mesh self-expanding elastic memory alloy metal wire bracket is provided in the liquid inlet and outlet guide tube. When the mesh self-expanding elastic memory alloy metal wire bracket is expanded, it can drive the liquid outlet end of the inner sheath to expand, and the outer sheath can limit or release the liquid inlet and outlet guide tube. Through the operation cooperation of the two artificial blood vessel thrombus removal devices, it has the advantages of being minimally invasive, convenient, economical and able to efficiently remove thrombi in artificial blood vessels such as arteriovenous fistulas.

[0007] The technical solution of the utility model is as follows:

[0008] An artificial blood vessel thrombus removal device comprises an inner core, an inner sheath, an air bag, an outer sheath and a hemostatic valve;

[0009] The inner core includes a guide wire and a core tube. The core tube, inner sheath and outer sheath are all hollow tubular structures. The inner sheath is movably sleeved outside the outer peripheral wall of the core tube and can move forward and backward relative to the core tube. The outer sheath is movably sleeved outside the outer peripheral wall of the inner sheath and can move forward and backward relative to the inner sheath.

[0010] The front end of the core tube is a pointed structure for easy puncture; the guide wire is inserted into the core tube, one end of which extends out of the rear end of the core tube to connect to the external operation control device, and the other end can extend from the front end of the core tube to guide the inner core to penetrate the artificial blood vessel;

[0011] The front end of the inner sheath is provided with a section of liquid inlet and outlet guide tube, and the liquid inlet and outlet guide tube comprises a guide tube wall made of a flexible deformable material and a mesh self-expanding elastic memory alloy wire bracket made of a shape memory alloy material that can be folded and expanded and is embedded in the guide tube wall. When the front end of the inner sheath extends out of the front end of the outer sheath to release the liquid inlet and outlet guide tube without being constrained by the outside, the mesh self-expanding elastic memory alloy wire bracket can drive the guide tube wall to automatically expand into a trumpet shape with a large front end and a small rear end under the action of its own elasticity. When the front end of the inner sheath moves into the body of the outer sheath so that the liquid inlet and outlet guide tube is squeezed by the outer sheath, the mesh self-expanding elastic memory alloy wire bracket The memory alloy wire bracket can drive the guide tube wall to shrink and adhere to the outer wall of the core tube and the inner wall of the outer sheath; the rear end of the inner sheath extends out of the rear end of the outer sheath and is provided with an inlet and outlet for draining liquid or connecting to an external liquid supply device for liquid supply. When the artificial blood vessel thrombus removal device is not in use, the inlet and outlet can also be connected to the hemostatic valve; the airbag is arranged outside the outer wall of the front end of the inner sheath and is located on the rear side of the inlet and outlet guide tube, and is connected to the outside world at the side of the inner sheath end through a pipe on the inner sheath wall. It can be connected to an external pressure pump or other device for filling or recovery. When filled, the airbag can block the gap between the artificial blood vessel and the outer wall of the inner sheath. After the airbag is recovered, it can shrink into the outer sheath along with the inner sheath.

[0012] The artificial blood vessel thrombus removal device of the present application adopts a structure of an inner core, an inner sheath and an outer sheath with movable sleeves. An air bag is provided on the outer peripheral wall of the inner sheath near the liquid outlet end of the inner sheath. A liquid inlet and outlet guide tube is provided at the front end of the inner sheath, and a mesh self-expanding elastic memory alloy metal wire bracket is provided in the liquid inlet and outlet guide tube. When the mesh self-expanding elastic memory alloy metal wire bracket is expanded, it can drive the liquid outlet end of the inner sheath to expand, and the outer sheath can limit or release the liquid inlet and outlet guide tube. Through the operation cooperation of the two artificial blood vessel thrombus removal devices, it has the advantages of being minimally invasive, convenient, economical and able to efficiently remove thrombi in artificial blood vessels' arteriovenous fistulas.

[0013] The initial state of the artificial vascular thrombus removal device is: the inner core is inserted into the inner sheath lumen, the inlet and outlet guide tubes and the airbag at the front end of the inner sheath are completely retracted into the outer sheath lumen, the inlet and outlet guide tubes are retracted and the airbag is not inflated, and the liquid supply device and hemostatic valve are not connected to the rear end of the inner sheath;

[0014] The working state of the artificial blood vessel thrombus removal device is as follows: after the device punctures into the artificial blood vessel, the outer sheath is retracted to expose the inlet and outlet liquid guide tube and the air bag, and the mesh self-expanding elastic memory alloy wire bracket drives the inlet and outlet liquid guide tube to naturally expand, making the inlet and outlet liquid guide tube trumpet-shaped, and then the inner core is completely pulled out of the inner sheath; the pressure pump inflates the air bag, and the liquid supply device is connected to the rear end of the inner sheath to supply liquid.

[0015] The specific operation process of artificial blood vessel thrombus removal is as follows:

[0016] 1. Puncture: Use a puncture needle to puncture the walls of the two ends of the artificial blood vessel where the thrombus needs to be removed, and insert the guide wire;

[0017] 2. Place artificial vascular thrombectomy device A and artificial vascular thrombectomy device B along the guidewire:

[0018] After the guide wire is sent to the predetermined position, the artificial blood vessel thrombectomy device A and the artificial blood vessel thrombectomy device B are guided into the artificial blood vessel, and the artificial blood vessel thrombectomy device A and the artificial blood vessel thrombectomy device B are both in the initial state;

[0019] 3. Flushing and removing thrombus: When the artificial blood vessel thrombus removal device A and the artificial blood vessel thrombus removal device B are respectively extended to the required positions in the artificial blood vessel; the outer sheath is retracted outside the artificial blood vessel cavity, the artificial blood vessel thrombus removal device A and the artificial blood vessel thrombus removal device B both enter the working state, the pressure pump inflates the air bag, temporarily blocks the blood flow, and prevents the thrombus from entering the artery and vein outside the artificial blood vessel during the flushing process and causing embolism; the liquid supply device (such as a syringe, etc.) of the artificial blood vessel thrombus removal device A pressurizes and injects the external flushing liquid (such as heparin water, etc.) into the artificial blood vessel to flush the thrombus in the artificial blood vessel and flush the thrombus out of the inner sheath of the artificial blood vessel thrombus removal device B;

[0020] In the same way, the liquid supply device of artificial blood vessel thrombectomy device A is closed, and the liquid supply device of artificial blood vessel thrombectomy device B pressurizes and injects external flushing fluid into the artificial blood vessel to flush the thrombus in the artificial blood vessel and flush the thrombus out of the inner sheath of artificial blood vessel thrombectomy device A;

[0021] Afterwards, the artificial blood vessel thrombus removal device A and the artificial blood vessel thrombus removal device B are operated back and forth in this manner, so that the two repeatedly offset each other to achieve the removal of the thrombus in the artificial blood vessel;

[0022] 4. End the resetting operation: the outer sheath is sent into the artificial blood vessel to restore both artificial blood vessel thrombectomy device A and artificial blood vessel thrombectomy device B to their initial states. Afterwards, the two hemostatic valves are respectively connected to the rear ends of the inner sheaths of artificial blood vessel thrombectomy device A and artificial blood vessel thrombectomy device B to facilitate subsequent other treatment operations.

[0023] The pointed tip at the front end of the core tube and the guidewire design greatly facilitate the placement of the artificial vascular thrombectomy device within the graft. Furthermore, the natural expansion of the meshed, self-expanding elastic memory alloy wire stent drives the deployment of the inlet and outlet guide tubes at the front end of the inner sheath, while the outer sheath flexibly limits and releases the inlet and outlet guide tubes. This significantly improves operational convenience and thrombus flushing efficiency, facilitating clot removal. The artificial vascular thrombectomy device initially presents a smooth tubular structure, facilitating its placement within the graft. This artificial vascular thrombectomy device boasts a simple structure, convenient operation, ease of mastery and implementation, and ease of clinical deployment. It offers low cost and minimally invasive thrombus removal, significantly extending the lifespan of uremic grafts. This minimally invasive puncture procedure avoids the drawbacks of existing open graft removal methods, such as the significant trauma, excessive bleeding, prolonged surgical time, slow recovery, and severe adhesions at the incision site. It can also be used repeatedly. Compared to the Angiojet thrombectomy system, it offers high thrombus removal efficiency, is economical, and is easily accepted by patients. After the balloons of artificial vascular thrombectomy device A and artificial vascular thrombectomy device B are inflated, appropriate urokinase thrombolytic agent can be injected into the artificial vascular thrombus through the inner sheath, so that the thrombolytic drug is completely present in the enclosed space between the balloons of the two artificial vascular thrombectomy devices in the artificial blood vessel. The thrombolytic efficiency is high, and the thrombolytic drug does not enter the human circulation, which can greatly reduce the risk of bleeding.

[0024] The airbag inflation device is a pressure pump.

[0025] The preferred airbag inflation device is readily available and low cost.

[0026] The liquid supply device is a syringe.

[0027] The preferred liquid supply device is readily available and low in cost.

[0028] The outer diameter of the inner sheath is 6F-8F.

[0029] The preferred inner sheath can be smoothly inserted into common artificial blood vessels and can ensure the efficiency of flushing thrombus.

[0030] The outer diameter of the balloon after inflation is 4-6 mm.

[0031] The outer diameter of the preferred balloon after inflation can well adapt to the size of existing commonly used artificial blood vessels, and has a good blood flow blocking effect.

[0032] The hemostatic valve is detachably connected to the liquid inlet and outlet of the inner sheath through threaded fitting.

[0033] Threaded fit allows for easy assembly and disassembly.

[0034] The trachea is arranged inside the wall of the inner sheath and extends backward along the wall of the inner sheath to the outside of the outer sheath.

[0035] This preferred arrangement allows for better relative movement of the outer sheath and the inner sheath, and during operation, there will not be an excessively large gap between the artificial blood vessel thrombus removal device and the artificial blood vessel.

[0036] Compared with the prior art, the utility model application has the following advantages:

[0037] 1) The artificial blood vessel thrombus removal device of the present application adopts a structure of an inner core, an inner sheath, and an outer sheath that are movably connected. An air bag is provided on the outer peripheral wall of the inner sheath near the liquid outlet end of the inner sheath. A liquid inlet and outlet guide tube is provided at the front end of the inner sheath, and a mesh self-expanding elastic memory alloy wire stent is provided within the liquid inlet and outlet guide tube. When the mesh self-expanding elastic memory alloy wire stent is deployed, it can drive the liquid outlet end of the inner sheath to expand, greatly improving the efficiency of thrombus collection. The outer sheath can limit or release the liquid inlet and outlet guide tube. Through the operation and coordination of the two artificial blood vessel thrombus removal devices, it has the advantages of being minimally invasive, convenient, economical, and capable of efficiently removing thrombi in artificial blood vessel arteriovenous fistulas;

[0038] 2) The preferred airbag filling device and liquid supply device are readily available and low in cost;

[0039] 3) The preferred inner sheath is smooth to be inserted into common artificial blood vessels and can ensure the efficiency of flushing thrombus;

[0040] 4) The outer diameter of the preferred balloon after inflation can be well adapted to the size of existing commonly used artificial blood vessels, has a good blood flow blocking effect, and blood clots are not likely to enter other blood vessels and cause embolism during the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a schematic structural diagram of the initial state of the artificial blood vessel thrombus removal device of the present invention;

[0042] Figure 2 This is a schematic structural diagram of the artificial blood vessel thrombus removal device of the present invention in working state;

[0043] Figure 3 This is a schematic diagram of the inner core structure of the artificial blood vessel thrombus removal device of the present invention;

[0044] Figure 4 This is a schematic diagram of the inner sheath structure of the artificial blood vessel thrombus removal device of the present invention;

[0045] Figure 5 This is a schematic diagram of the outer sheath structure of the artificial blood vessel thrombus removal device of the present invention;

[0046] Figure 6 This is a schematic diagram of the working of the artificial blood vessel thrombus removal device of the present invention;

[0047] Figure 7The utility model is an artificial blood vessel thrombus removal device Figure 1 AA section view;

[0048] Figure 8 The utility model is an artificial blood vessel thrombus removal device Figure 4 AA section view.

[0049] Description of labels:

[0050] Inner sheath 1, air bag 2, outer sheath 3, hemostatic valve 4, guide wire 5, core tube 6, mesh self-expanding elastic memory alloy wire stent 7, trachea 8, inlet and outlet liquid guide tube 1-1, inlet and outlet liquid port 1-2. DETAILED DESCRIPTION

[0051] The technical solution of the present invention will be described clearly and completely below with reference to the accompanying drawings.

[0052] like Figure 1-8 As shown, the artificial blood vessel thrombus removal device of the present invention comprises an inner core, an inner sheath 1, an air bag 2, an outer sheath 3 and a hemostatic valve 4;

[0053] The inner core includes a guide wire 5 and a core tube 6. The core tube 6, the inner sheath 1 and the outer sheath 3 are all hollow tubular structures. The inner sheath 1 is movably sleeved outside the outer peripheral wall of the core tube 6 and can move forward and backward relative to the core tube 6. The outer sheath 3 is movably sleeved outside the outer peripheral wall of the inner sheath 1 and can move forward and backward relative to the inner sheath 1.

[0054] The front end of the core tube 6 is a pointed structure for puncture; the guide wire 5 is passed through the core tube 6, one end of which extends out of the rear end of the core tube 6 to connect to the external operation control device, and the other end can extend from the front end of the core tube 6 to guide the inner core to pass through the artificial blood vessel;

[0055] The front end of the inner sheath 1 is provided with a section of inlet and outlet liquid guide tube 1-1, and the inlet and outlet liquid guide tube 1-1 includes a guide tube wall made of a flexible deformable material and a mesh self-expanding elastic memory alloy wire bracket 7 made of a shape memory alloy material that can be folded and expanded and is embedded in the guide tube wall. When the front end of the inner sheath 1 extends out of the front end of the outer sheath 3 to release the inlet and outlet liquid guide tube 1-1 without being constrained by the outside, the mesh self-expanding elastic memory alloy wire bracket 7 can drive the guide tube wall to automatically expand into a trumpet shape with a large front end and a small rear end under the action of its own elasticity. When the front end of the inner sheath 1 moves into the body of the outer sheath 3 so that the inlet and outlet liquid guide tube 1-1 is squeezed by the outer sheath 3, the mesh self-expanding elastic memory alloy wire bracket 7 can automatically expand into a trumpet shape with a large front end and a small rear end. The filament bracket 7 can drive the guide tube wall to shrink to be attached between the outer peripheral wall of the core tube 6 and the inner peripheral wall of the outer sheath 3; the rear end of the inner sheath 1 extends out from the rear end of the outer sheath 3 and is provided with a liquid inlet and outlet 1-2 for draining or connecting to an external liquid supply device for liquid intake. When the artificial blood vessel thrombus removal device is not in use, the liquid inlet and outlet 1-2 can also be connected to the hemostatic valve 4; the air bag 2 is surrounded by the outer peripheral wall of the front end of the inner sheath 1 and is located at the rear side of the liquid inlet and outlet guide tube 1-1. The air bag 2 is connected to the outside world at the side of the inner sheath 1 end through the pipeline 8 on the wall of the inner sheath 1, and can be connected to an external pressure pump or other device for filling or recovery. The air bag 2 can block the gap between the artificial blood vessel and the peripheral wall of the inner sheath 1 when filled, and can be retracted into the outer sheath 3 with the inner sheath 1 after recovery.

[0056] The airbag inflation device is a pressure pump.

[0057] The liquid supply device is a syringe.

[0058] The outer diameter of the inner sheath 1 is 6F-8F.

[0059] The outer diameter of the airbag 2 after being inflated is 4-6 mm.

[0060] The hemostatic valve 4 is detachably connected to the liquid inlet and outlet 1-2 of the inner sheath 1 through threaded engagement.

[0061] The trachea 8 is arranged inside the wall of the inner sheath 1 and extends backward along the wall of the inner sheath 1 to the outside of the outer sheath 3 .

Claims

1. An artificial blood vessel thrombus removal device, characterized in that: It comprises an inner core, an inner sheath (1), an air bag (2), an outer sheath (3) and a hemostatic valve (4); The inner core comprises a guide wire (5) and a core tube (6); the core tube (6), the inner sheath (1) and the outer sheath (3) are all hollow tubular structures; the inner sheath (1) is movably sleeved outside the outer peripheral wall of the core tube (6) and can move forward and backward relative to the core tube (6); the outer sheath (3) is movably sleeved outside the outer peripheral wall of the inner sheath (1) and can move forward and backward relative to the inner sheath (1); The front end of the core tube (6) is a pointed structure for puncture convenience; the guide wire (5) is inserted into the core tube (6), one end of which extends out of the rear end of the core tube (6) to connect to an external operation control device, and the other end of which can extend from the front end of the core tube (6) to guide the inner core to be inserted into the artificial blood vessel; The front end of the inner sheath (1) is provided with a section of liquid inlet and outlet guide tube (1-1), and the liquid inlet and outlet guide tube (1-1) comprises a guide tube wall made of a flexible deformable material and a mesh self-expanding elastic memory alloy wire bracket (7) made of a shape memory alloy material that can be both contracted, folded and expanded and embedded in the guide tube wall. When the front end of the inner sheath (1) extends out of the front end of the outer sheath (3) to release the liquid inlet and outlet guide tube (1-1) without being constrained by the outside, the mesh self-expanding elastic memory alloy wire bracket (7) can drive the guide tube wall to automatically expand into a trumpet shape with a larger front end and a smaller rear end under its own elastic action. When the front end of the inner sheath (1) moves into the body of the outer sheath (3) to squeeze the liquid inlet and outlet guide tube (1-1), the mesh self-expanding elastic memory alloy wire bracket (7) can automatically expand the guide tube wall into a trumpet shape with a larger front end and a smaller rear end under its own elastic action. The memory alloy wire support (7) can drive the guide tube wall to shrink and adhere to the outer peripheral wall of the core tube (6) and the inner peripheral wall of the outer sheath (3); the rear end of the inner sheath (1) extends out of the rear end of the outer sheath (3) and is provided with a liquid inlet and outlet (1-2) for draining liquid or connecting to an external liquid supply device for liquid inlet; when the artificial blood vessel thrombus removal device is not in use, the liquid inlet and outlet (1-2) can also be connected to the hemostatic valve (4); the air bag (2) is arranged outside the outer peripheral wall of the front end of the inner sheath (1) and is located on the rear side of the liquid inlet and outlet guide tube (1-1); the air bag (2) is connected to an external air bag filling device through an trachea (8) for inflation and deflation; when inflated, the air bag (2) can block the gap between the artificial blood vessel and the outer peripheral wall of the inner sheath (1); after deflation, the air bag (2) can shrink into the outer sheath (3) along with the inner sheath (1).

2. The artificial blood vessel thrombus removal device according to claim 1, characterized in that: The airbag inflation device is a pressure pump.

3. The artificial blood vessel thrombus removal device according to claim 1, characterized in that: The liquid supply device is a syringe.

4. The artificial blood vessel thrombus removal device according to claim 1, characterized in that: The outer diameter of the inner sheath (1) is 6F-8F.

5. The artificial blood vessel thrombus removal device according to claim 1, characterized in that: The outer diameter of the airbag (2) after being inflated is 4-6 mm.

6. The artificial blood vessel thrombus removal device according to claim 1, characterized in that: The hemostatic valve (4) is detachably connected to the liquid inlet and outlet (1-2) of the inner sheath (1) through threaded engagement.

7. The artificial blood vessel thrombus removal device according to claim 1, characterized in that: The trachea (8) is arranged inside the wall of the inner sheath (1) and extends backward along the wall of the inner sheath (1) to the outside of the outer sheath (3).

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