Bracket overturning thrombectomy device
By designing a stent flip-up and tamper removal device, the mesh stent is used to flip and expand in the catheter, and combined with the synergistic effect of internal and external traction parts, the risks and efficiency of thrombosis removal in the prior art are solved, and the smooth removal of thrombosis and the reduction of surgical risks are achieved.
Patent Information
- Application Number
- CN202421277621.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-05
- Publication Date
- 2025-04-15
- Estimated Expiration
- 2034-06-05
AI Technical Summary
The existing thromboe removal technology has problems such as small thrombus escape, stent exposure leads to endometrial damage, and overall clot tendency to be difficult to pull into the catheter, which increases the risk and time of surgery.
A stent flip-up and tug-retrieval device is designed, including a catheter, a mesh stent and an inner and outer traction member. The mesh stent is flipped and expanded in the catheter. Through the synergistic action of the internal and external traction members, the thrombus is pulled into the catheter smoothly to avoid clogging and endometrial damage.
It achieves smooth removal of thrombus, reduces surgical risks, avoids endovascular damage, and simplifies the device structure.
Smart Images
Figure CN222752111U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of thrombus removal, in particular to a stent flipping thrombus removal device. Background Art
[0002] Thrombi, also known as blood clots, can attach to blood vessel walls and prevent blood from flowing through healthy blood vessels. Removing thrombi generated within blood vessels and reopening blocked blood vessels is the key to restoring blood vessels blocked by thrombi.
[0003] The existing technology can remove thrombi by using stent thrombectomy devices, suction catheter devices, and suction + stent thrombectomy. The existing stent thrombectomy devices are connected to the guide wire through the stent, and the stent is brought to the thrombus through the catheter. The stent passes through the thrombus, the stent is released at the thrombus, and the guide wire is pulled back to the proximal end, so that the thrombus is brought into the catheter by the stent and finally pulled out. The shortcomings of this method are: small thrombi are easy to escape and block the distal blood vessels during the thrombus removal process, and there is also a risk of the stent being exposed in the blood vessel during the thrombus removal, causing endothelial damage, etc. At the same time, when the stent is pulled into the catheter, the clot and the stent may be overall biased, and there is a risk of difficulty in pulling it into the catheter, which increases the operation time and operation risks;
[0004] The existing suction catheter device uses a negative pressure suction device to allow the thrombus in the blood vessel to enter the catheter from the distal opening of the catheter and finally be extracted. The disadvantages of this method are: when the thrombus is large, the thrombus is easy to block the distal end of the catheter, and high-viscosity thrombus is also easy to block in the catheter, which increases the risk of thrombus removal surgery and easily causes major medical accidents;
[0005] Currently, there is a method of using suction catheter in conjunction with stent thrombectomy, which can solve some problems existing in suction thrombectomy alone and stent thrombectomy alone. However, there is still a risk that the stent will be exposed in the blood vessel during thrombectomy, causing endothelial damage, and the stent will be difficult to pull into the catheter due to the clot being too large or the overall direction of the clot and stent being off. Summary of the invention
[0006] The purpose of the utility model is to solve the deficiencies of the above-mentioned prior art and to provide a stent flipping thrombus removal device which has a simple structure, can effectively remove thrombi, will not block the catheter, and will not cause damage to blood vessels.
[0007] The technical solution adopted by the utility model to solve its technical problems is:
[0008] A stent flipping thrombus removal device, characterized in that it includes a catheter, a mesh stent and an internal traction member, the mesh stent adopts a cylindrical structure, the mesh stent is arranged in the catheter and is located at the distal end of the catheter, the distal end of the mesh stent flips inward into the interior of the mesh stent to form an inner end of the stent, and the inner end of the stent is connected to the internal traction member; the mesh stent is arranged in the catheter, and the stent is pulled toward the proximal end by the internal traction member to smoothly pull the thrombus into the catheter, the thrombus will not be blocked at the distal end of the catheter, and will not cause damage to the vascular endothelium, the structure is simple, the thrombus removal effect is good, and the surgical risk is reduced.
[0009] The utility model also includes an external traction member, which is connected to the proximal end of the stent. By the external traction member and the internal traction member working simultaneously, when the internal traction member pulls the inner end of the stent toward the proximal end, the external traction member pushes toward the distal end, which can better ensure that the mesh stent wraps the thrombus.
[0010] The utility model forms a flip section between the inner end of the stent and the proximal end of the stent, and the external traction member pushes the proximal end of the stent to move toward the distal end of the catheter to drive the flip section of the mesh stent to extend out of the catheter, so that the flip section contacts the thrombus, thereby facilitating pulling the thrombus.
[0011] The mesh support of the utility model adopts an expandable support.
[0012] The external traction member of the utility model pushes the proximal end of the stent to move toward the distal end of the catheter, driving the flip section of the mesh stent to extend out of the catheter and expand outward to form a trumpet shape; the part of the mesh stent extending out of the catheter is not restricted by the catheter and can expand outward, and pulling the internal traction member toward the proximal end can smoothly bring the thrombus into the mesh stent.
[0013] The proximal end of the catheter of the utility model is connected with a suction assembly, which further ensures that thrombus will not be blocked at the distal end of the catheter, and also ensures that small thrombus will not escape.
[0014] The inner traction member of the utility model adopts a tubular structure, the inner traction member is coaxially arranged with the mesh support, and the distal end of the inner traction member is connected with the inner end of the support.
[0015] The inner traction member of the utility model adopts a filament structure, and a plurality of connecting wires are extended radially outward from the distal end of the inner traction member, and the connecting wires are connected to the inner end of the bracket.
[0016] The external traction member of the utility model adopts a tubular structure, and the external traction member is coaxially arranged with the mesh bracket. The external traction member is sleeved on the inner end of the bracket and the outside of the internal traction member, and the distal end of the external traction member is connected to the proximal end of the bracket. The structural setting of the external traction member ensures that the proximal end of the bracket can be pushed upward smoothly without interfering with the inner end of the bracket and the internal traction member.
[0017] The distal opening of the catheter of the utility model is arranged as an expandable soft section; when removing the thrombus, when the thrombus reaches the distal opening of the catheter, if the thrombus is relatively large, the distal end of the catheter can be expanded to ensure that the thrombus can smoothly enter the catheter.
[0018] The beneficial effects of the utility model are as follows: the mesh stent is arranged in the catheter, and the thrombus can be smoothly pulled into the catheter by pulling the stent toward the proximal end through the internal traction member, and the thrombus will not be blocked at the distal end of the catheter, nor will it cause damage to the vascular endothelium. The structure is simple, the thrombus removal effect is good, and the surgical risk is reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the structure of the stent flipping thrombectomy device of the utility model when it is delivered to the thrombus position.
[0020] Figure 2 It is a schematic diagram of the structure of the stent contacting thrombus of the utility model.
[0021] Figure 3 It is a schematic diagram of the structure of the thrombus pulling-in stent of the utility model.
[0022] Figure 4 This is a schematic diagram of the utility model in which a thrombus is completely pulled into the stent structure.
[0023] Figure 5 It is a schematic diagram of the support structure of the utility model.
[0024] Figure numerals: blood vessel-1, thrombus-2, mesh stent-3, stent inner end-301, stent proximal end-302, flip segment-303, inner traction member-401, outer traction member-402, catheter-5. DETAILED DESCRIPTION
[0025] The utility model is described below in conjunction with the accompanying drawings and embodiments.
[0026] Embodiment 1:
[0027] As shown in the accompanying drawings, a stent flipping thrombus removal device includes a catheter 5, a mesh stent 3 and an inner traction member 401. The mesh stent 3 adopts a cylindrical structure. The mesh stent 3 is arranged in the catheter 5 and is located at the distal end of the catheter 5. The distal end of the mesh stent 3 flips inward into the mesh stent 3 to form an inner end 301 of the stent. The inner end 301 of the stent is connected to the inner traction member 401. The proximal end of the inner traction member 401 extends out of the proximal end of the catheter 5, which is convenient for pulling the inner traction member 401 to drive the mesh stent to move; the mesh stent 3 is arranged in the catheter 5, and the stent is pulled toward the proximal end by the inner traction member 401. The thrombus can be smoothly pulled into the catheter 5, and the thrombus 2 will not be blocked at the distal end of the catheter 5, nor will it cause damage to the endothelium of the blood vessel 1. The structure is simple, the thrombus removal effect is good, and the surgical risk is reduced.
[0028] This embodiment also includes an external traction member 402, which is connected to the proximal end 302 of the stent, and the proximal end of the external traction member extends out of the proximal end of the catheter 5; the external traction member 402 and the internal traction member 401 work simultaneously, when the internal traction member 401 pulls the inner end 301 of the stent toward the proximal end, the external traction member 402 pushes toward the distal end, which can better ensure that the mesh stent 3 wraps the thrombus 2.
[0029] In this embodiment, the inner traction member 401 adopts a soft filament structure, and a plurality of connecting lines are radially extended outward from the distal end of the filament, and the connecting lines are connected to the inner end 301 of the bracket. In this embodiment, the filament is arranged at the axis of the mesh bracket 3 to ensure that when the filament is pulled to move the inner end 301 of the bracket, the mesh bracket 3 will not be deflected.
[0030] The structure of the inner traction member 401 is not limited to this. The inner traction member 401 can also adopt a soft internal hollow tubular structure. The inner traction member 401 is coaxially arranged with the mesh stent 3. The distal end of the inner traction member 401 is connected to the inner end 301 of the stent. The inner traction member 401 adopts a tubular structure, and the guide wire that guides the mesh stent 3 and the catheter 5 to the thrombus position can pass through the middle of the inner traction member 401.
[0031] The outer traction member 402 adopts a soft tubular structure with a hollow interior. The outer traction member 402 is coaxially arranged with the mesh support 3. The outer traction member 402 is sleeved on the inner end 301 of the support and the outside of the inner traction member 401. The distal end of the outer traction member 402 is connected to the proximal end 302 of the support. The structural setting of the outer traction member 402 ensures that the proximal end 302 of the support can be pushed upward smoothly without interfering with the inner end 301 of the support and the inner traction member 401.
[0032] In this embodiment, the outer traction member adopts a tubular structure to effectively ensure that it will not interfere with the movement of the inner traction member and the mesh support. It can also be set to a filament structure according to actual use needs as long as it does not interfere with the movement of the inner traction member and the mesh support.
[0033] The mesh stent 3 is an expandable stent.
[0034] A flip section 303 is formed between the inner end 301 of the stent and the proximal end 302 of the stent, and the external traction member 402 pushes the proximal end 302 of the stent to move toward the distal end of the catheter 5, driving the flip section of the mesh stent 3 to extend out of the catheter 5 and expand outward; the portion of the mesh stent 3 extending out of the catheter 5 is not constrained by the catheter 5 and can expand outward to form a trumpet shape, so that the distal opening of the mesh stent can wrap around the thrombus, and pulling the inner traction member 401 toward the proximal end can smoothly bring the thrombus into the mesh stent 3.
[0035] The distal opening of the catheter 5 is configured as an expandable soft section so that when removing the thrombus, when the thrombus 2 reaches the distal opening of the catheter, if the thrombus is large, the distal end of the catheter can expand into a trumpet shape to ensure that the thrombus can smoothly enter the catheter.
[0036] During thrombectomy:
[0037] 1. Puncture the femoral artery, use the guide wire to guide the outer sheath into the blood vessel 1 to the proximal position of the thrombus 2, and then withdraw the guide wire;
[0038] 2. The catheter 5 is inserted into the outer sheath tube, the mesh stent 3 is inserted into the distal end of the catheter 5, and the mesh stent 3 is in a flipped state in the catheter 5. The catheter 5, the mesh stent 3, the inner traction member 401 and the outer traction member 402 are moved in the outer sheath tube to the proximal end of the thrombus 2, and the outer sheath tube is withdrawn;
[0039] 3. The operator pushes the outer traction member 402 to the distal end, driving the proximal end 302 of the stent to move toward the distal end of the catheter 5, so that the flip section 303 of the mesh stent 3 can be pushed out of the catheter 5 and contact the thrombus 2. After the flip section 303 is released from the distal opening of the catheter 5, it expands into a trumpet shape. At this time, the proximal end 302 of the stent and the inner end 301 of the stent are still located in the catheter 5;
[0040] 4. The operator performs the following operations simultaneously: pulling the inner traction member 401 proximally to drive the inner end 301 of the stent to move proximally, pushing the outer traction member 402 distally to drive the proximal end 302 of the stent to move distally, and pushing the catheter 5 distally, so that the thrombus 2 can be completely pulled into the catheter 5, and finally the thrombus 2 can be removed.
[0041] Embodiment 2:
[0042] The difference between Example 2 and Example 1 is that a suction component is connected to the proximal end of the catheter to further ensure that the thrombus will not be blocked at the distal end of the catheter, and at the same time to ensure that small thrombi will not escape. The suction component is a prior art and will not be described in detail here.
[0043] The procedure for setting up the suction assembly for thrombectomy is as follows:
[0044] 1. Puncture the femoral artery, use the guide wire to guide the outer sheath into the blood vessel 1 to the proximal position of the thrombus 2, and then withdraw the guide wire;
[0045] 2. The catheter 5 is inserted into the outer sheath tube, the mesh stent 3 is inserted into the distal end of the catheter 5, and the mesh stent 3 is in a flipped state in the catheter 5. The catheter 5, the mesh stent 3, the inner traction member 401 and the outer traction member 402 are moved in the outer sheath tube to the proximal end of the thrombus 2, and the outer sheath tube is withdrawn;
[0046] 3. The operator pushes the outer traction member 402 to the distal end, driving the proximal end 302 of the stent to move toward the distal end of the catheter 5, so that the flip section 303 of the mesh stent 3 can be pushed out of the catheter 5 and contact the thrombus 2. After the flip section 303 is released from the distal opening of the catheter 5, it expands into a trumpet shape. At this time, the proximal end 302 of the stent and the inner end 301 of the stent are still located in the catheter 5;
[0047] 4. The operator performs the following operations at the same time: the suction component works to suction the thrombus, the inner traction member 401 is pulled proximally to drive the inner end 301 of the stent to move proximally, and the outer traction member 402 is pushed distally to drive the proximal end 302 of the stent to move distally, so that the thrombus 2 can be completely pulled into the catheter 5, and the thrombus 2 is finally removed.
Claims
1. A stent flipping thrombus removal device, characterized in that: It includes a catheter, a mesh stent and an inner traction piece. The mesh stent adopts a cylindrical structure. The mesh stent is arranged in the catheter and located at the distal end of the catheter. The distal end of the mesh stent is turned inward into the interior of the mesh stent to form an inner end of the stent, and the inner end of the stent is connected to the inner traction piece.
2. The stent flipping thrombus removal device according to claim 1, characterized in that: It also includes an external traction member, which is connected to the proximal end of the stent.
3. The stent flipping thrombus removal device according to claim 2, characterized in that: A flip section is formed between the inner end of the stent and the proximal end of the stent, and the external traction member pushes the proximal end of the stent to move toward the distal end of the catheter to drive the flip section of the mesh stent to extend out of the catheter.
4. The stent flipping thrombus removal device according to claim 3, characterized in that: The mesh stent is an expandable stent.
5. The stent flipping thrombus removal device according to claim 4, characterized in that: The outer traction member pushes the proximal end of the stent to move toward the distal end of the catheter, driving the flipping section of the mesh stent to extend out of the catheter and expand outward to form a trumpet shape.
6. A stent flipping thrombus removal device according to claim 1, 2, 3, 4 or 5, characterized in that: The proximal end of the catheter is connected with a suction component.
7. The stent flipping thrombus removal device according to claim 1, 2, 3, 4 or 5, characterized in that: The inner traction member adopts a tubular structure, the inner traction member is coaxially arranged with the mesh support, and the distal end of the inner traction member is connected to the inner end of the support.
8. The stent flipping thrombus removal device according to claim 1, 2, 3, 4 or 5, characterized in that: The inner traction member adopts a filament structure, and a plurality of connecting wires are radially extended outward from the distal end of the inner traction member, and the connecting wires are connected to the inner end of the stent.
9. The stent flipping thrombus removal device according to claim 2, 3, 4 or 5, characterized in that: The outer traction member adopts a tubular structure, is coaxially arranged with the mesh support, is sleeved on the inner end of the support and outside the inner traction member, and the distal end of the outer traction member is connected to the proximal end of the support.
10. The stent flipping thrombus removal device according to claim 1, 2, 3, 4 or 5, characterized in that: The distal opening of the catheter is arranged as an expandable soft section.