Capturing device of inferior vena cava filter and using method
By using an improved inferior vena cava filter capture device, which combines an inverted "U"-shaped hook with a snare catheter, the problem of inaccurate judgment of separation between the retrieval hook and the vessel wall in existing devices has been solved, enabling safe and minimally invasive filter removal and reducing surgical risks and costs.
Patent Information
- Application Number
- CN202511326179.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-17
- Publication Date
- 2025-11-28
AI Technical Summary
Existing inferior vena cava filter capture devices are ineffective in determining whether the retrieval hook has separated from the contact surface of the blood vessel wall, which can easily lead to scratches, perforations, or breakage of the filter support legs, increasing the risk of postoperative thrombosis and medical costs.
A capture device for an inferior vena cava filter is used, including an inlet, a snare catheter, and a traction hook. The traction hook has an inverted "U" shaped hook. By using the snare catheter and the traction hook in combination, it is ensured that the retrieval hook separates from the blood vessel wall and then snares the filter, avoiding damage caused by forced traction.
This technology enables the safe removal of the inferior vena cava filter through a single puncture point without the need for other instruments, simplifying the procedure, reducing surgical time and radiation dose, and lowering the risk of vascular injury.
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Figure CN121015346A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of medical devices, in particular to a capture device for inferior vena cava filter and a use method thereof. BACKGROUND
[0002] The capture device for inferior vena cava filter comprises a snare, a snare catheter, a traction hook, an introducer and a torque device, a vein is punctured through the introducer to establish an operation path, the snare catheter or the traction hook enters the blood vessel through the introducer to approach the target filter, the torque device is used to rotate the snare catheter or the traction hook to align it with the filter axis, the snare is closed or the traction hook is embedded into the filter structure to complete the capture, and the capture tool is slowly pulled to pull the filter into the introducer and withdraw it out of the body.
[0003] The existing traction hook is in the shape of J type or hawk beak type hook, and the effect of using the traction hook to judge whether the contact surface between the recovery hook and the inferior vena cava vessel wall is separated is poor, if the recovery hook is not completely separated from the vessel wall, the traction hook misjudges that the capture is successful, and forcibly pulling can cause the filter support leg or hook part to scratch the vessel wall, causing tearing, perforation or bleeding, even if no obvious perforation occurs, repeatedly adjusting the position of the traction hook or applying improper traction force can cause damage to the vascular endothelial cells, increase the risk of postoperative thrombosis, if the adhesion between the recovery hook and the vessel wall is not identified, the traction hook applies excessive pulling force to cause the filter support leg or hook part to break, and the residual fragments are in the blood vessel, the residual filter fragments can become a new embolism source, which needs to be removed through additional surgery, increasing the pain and medical cost of the patient. SUMMARY
[0004] Technical problem to be solved The present application provides a capture device for inferior vena cava filter and a use method thereof, which solves the problem of difficult capture of inferior vena cava filter.
[0005] Technical scheme In order to achieve the purpose of easy capture of inferior vena cava filter, the present application is implemented by the following technical scheme: a capture device for inferior vena cava filter and a use method thereof, comprising an introducer, a snare catheter movably installed in the interior of the introducer, a snare movably installed in the interior of the snare catheter, a traction hook movably installed in the interior of the introducer, a torque device installed on the surface of one end of the snare catheter and the surface of one end of the traction hook, a snare movably installed in the interior of the snare catheter, and a reverse "U" type bent hook arranged in the traction hook.
[0006] A use method of a capture device for inferior vena cava filter, comprising the following steps: S1, first introduce the traction hook through the guide catheter to make the traction hook hook the layer of basket adjacent to the recovery hook of the filter, and gently pull the traction hook to judge whether the contact surface between the recovery hook and the inferior vena cava vessel wall is separated.
[0007] S2, when the recovery hook and inferior vena cava blood vessel wall contact surface can be separated, the distal end of the introducer is inserted into the catheter seat of the snare catheter, the snare and the snare catheter are assembled to form a separation assembly, the separation assembly is a snare and snare catheter assembly, the introducer is withdrawn, the rotation device is introduced into the proximal end of the snare, the snare loop of the snare passes through the proximal end of the traction hook, and the entire separation assembly is pushed along the traction hook to the guide catheter until the snare loop is located below the inferior vena cava filter.
[0008] S3, the snare shaft is gently pushed forward to completely open the snare loop, and the snare loop is slowly introduced below the parietal side recovery hook.
[0009] S4, the traction hook is gently pulled to separate the recovery hook and the inferior vena cava blood vessel wall contact surface, the snare loop is quickly pushed up through the gap separated by the traction hook to surround the mesh basket adjacent to the recovery hook of the inferior vena cava filter, the traction hook is withdrawn, the snare catheter is pushed forward, the snare loop is contracted, the snare is tightly fitted to the recovery hook of the inferior vena cava filter, and the snare and the snare catheter are moved together and removed into the guide catheter, and the catheter sheath is withdrawn out of the body.
[0010] S5, when the recovery hook and the inferior vena cava blood vessel wall contact surface cannot be separated, the traction hook is not blindly pulled to prevent the filter from being displaced, and the traction hook is tried to be controlled and pushed upward, so that the recovery hook and the inferior vena cava blood vessel wall contact surface can be separated.
[0011] S6, the distal end of the introducer is inserted into the catheter seat of the snare catheter, the snare and the snare catheter are assembled to form a separation assembly, the introducer is withdrawn, the rotation device is introduced into the proximal end of the snare, the entire separation assembly is pushed into the guide catheter, the snare shaft is gently pushed forward to completely open the snare loop, and the snare loop is slowly introduced below the parietal side recovery hook.
[0012] S7, the traction hook is operated to separate the recovery hook and the inferior vena cava blood vessel wall contact surface, the snare loop is quickly pushed up through the gap separated by the traction hook to surround the mesh basket adjacent to the recovery hook of the inferior vena cava filter, the traction hook is withdrawn, the snare catheter is pushed forward, and the snare loop is contracted, so that the snare is tightly fitted to the recovery hook of the inferior vena cava filter.
[0013] S8, the snare and the snare catheter are moved together and removed into the guide catheter, and the catheter sheath is withdrawn out of the body.
[0014] Advantages The present application has the following advantages: The catching device of the inferior vena cava filter and the use method, by adding a traction hook provided with an inverted "U" type hook, the operation space and angle are not limited, the inferior vena cava filter can be taken out only through a puncture point without other instrument assistance, the operation is simple, convenient, minimally invasive and safe, the operation time is obviously shortened, and the radiation dose of doctors and patients is reduced.
[0015] Of course, implementing any product of the present application does not necessarily require all the advantages described above to be achieved at the same time. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 It is the whole structure schematic diagram of the traction hook of the present application; Figure 2 It is the whole structure schematic diagram of the introducer of the present application; Figure 3 It is the whole structure schematic diagram of the torque device of the present application; Figure 4 It is the whole structure schematic diagram of the snare catheter of the present application; Figure 5 It is the whole structure schematic diagram of the snare of the present application.
[0017] In the figure: 1, snare; 2, snare catheter; 3, traction hook; 4, introducer; 5, torque device. DETAILED DESCRIPTION
[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0019] In the description of the present application, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery" and the like indicate the orientation or positional relationship, only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation to the present application.
[0020] Please refer to Figures 1-5The embodiment of the application provides a technical scheme: a catching device of an inferior vena cava filter, comprising a lead-in device 4, a snare catheter 2 movably arranged in the lead-in device 4, a snare 1 movably arranged in the snare catheter 2, a traction hook 3 movably arranged in the lead-in device 4, a torque device 5 arranged on one end surface of the snare catheter 2 and one end surface of the traction hook 3, and a snare 1 movably arranged in the snare catheter 2, wherein the traction hook 3 is provided with an inverted U-shaped hook.
[0021] A use method of the catching device of the inferior vena cava filter, comprising the following steps: Embodiment one: 1. Preliminary judgment of the inferior vena cava filter recovery hook wall sticking side is made through perspective, the recovery hook is recovered from the opposite side femoral vein access except the proximal end, the hand pushes the imaging is combined with the rotating C arm tangential position to display the minimum gap between the layer of the mesh basket adjacent to the recovery hook and the inferior vena cava wall of the inferior vena cava filter on the wall sticking side of the recovery hook, the accurate direction of the wall sticking of the recovery hook is judged, the snare catheter 2 is used to guide the 0.035 inch 150 cm super smooth guide wire to pass through the gap between the layer of the mesh basket adjacent to the recovery hook and the inferior vena cava wall of the inferior vena cava filter on the wall sticking side instead of the gap between the support legs of the inferior vena cava filter, the guide wire is left, and the snare catheter 2 is withdrawn. If the direction of the wall sticking of the recovery hook is located in the horizontal position of the left or right side wall of the inferior vena cava, the 0.035 inch 150 cm super smooth guide wire can be left in the inferior vena cava cavity except the proximal end of the recovery hook from the opposite side femoral vein access.
[0022] 2. The snare 1, the lead-in device 4 and the torque device are taken down, the distal end of the lead-in device 4, i.e. the tail end, is inserted into the catheter seat of the snare catheter 2, the snare 1 and the snare catheter 2 are assembled to form a separation assembly, the snare loop of the snare 1 passes through the proximal end of the guide wire, the whole separation assembly of the snare 1 and the snare catheter 2 is pushed into the guide catheter or the catheter sheath, and the distal end of the snare catheter 2 is located close to the inferior vena cava filter.
[0023] 3. The snare 1 shaft is gently pushed forward to make the snare loop completely open, the snare loop is slowly introduced to the lower side of the wall sticking side recovery hook, and the guide wire, the snare 1 and the snare catheter 2 are adjusted to be on the inferior vena cava wall on which the recovery hook of the inferior vena cava is attached.
[0024] 4. The whole system is pushed to separate the recovery hook and the contact surface of the inferior vena cava blood vessel wall, the snare loop is quickly pushed upward to cover the layer of the mesh basket adjacent to the recovery hook or the recovery hook of the inferior vena cava filter through the gap, the guide wire is withdrawn, the snare catheter 2 is pushed, the snare loop is contracted, and the snare 1 covers the recovery hook of the inferior vena cava filter.
[0025] 5. The snare 1 and the snare catheter 2 are moved together and taken out after being moved into the guide catheter or the catheter sheath, or are withdrawn together with the guide catheter or the catheter sheath.
[0026] Example Two: 1. Under fluoroscopy, the direction of the hook is judged. Except for the proximal end, the hook is retrieved from the opposite side of the femoral vein. The minimum gap between the layer of the basket adjacent to the hook and the wall of the inferior vena cava is displayed by hand-pushing angiography combined with rotating C-arm cut-off position, and the accurate direction of the hook is judged. The traction hook 3 is introduced through the guide catheter or catheter sheath, and the traction hook 3 is hooked on the layer of the basket adjacent to the hook or the groove of the hook. Whether the contact surface between the hook and the wall of the inferior vena cava is separated is judged by gently pulling the traction hook 3. Or the traction hook 3 is used to push against the wall of the inferior vena cava on the side of the hook of the inferior vena cava filter, and whether the contact surface between the hook and the wall of the inferior vena cava is separated is judged by cut-off position.
[0027] 2. If the contact surface between the hook and the wall of the inferior vena cava can be separated, the snare 1, the introducer 4 and the torque device are removed. The distal end of the introducer 4, i.e. the tail end, is inserted into the catheter seat of the snare catheter 2. The snare 1 and the snare catheter 2 form a separation assembly. The snare ring of the snare 1 passes through the proximal end of the traction hook 3. The entire separation assembly of the snare 1 and the snare catheter 2 is pushed into the guide catheter or catheter sheath along the traction hook 3 until the snare ring is located near the inferior vena cava filter.
[0028] 3. The snare 1 is gently pushed forward to make the snare ring fully open. The snare ring is slowly introduced below the hook on the side of the wall.
[0029] 4. The contact surface between the hook and the wall of the inferior vena cava is separated by gently pulling the traction hook 3. The snare ring is quickly pushed up to cover the layer of the basket adjacent to the hook of the inferior vena cava filter or the hook. The traction hook 3 is withdrawn. The snare catheter 2 is pushed forward. The snare ring is contracted to make the snare 1 cover the hook of the inferior vena cava filter.
[0030] 5. The snare 1 and the snare catheter 2 are moved together and removed into the guide catheter or catheter sheath, or withdrawn together with the guide catheter or catheter sheath.
[0031] Example Three: 1. Under fluoroscopy, the direction of the hook is judged. Except for the proximal end, the hook is retrieved from the opposite side of the femoral vein. The minimum gap between the layer of the basket adjacent to the hook and the wall of the inferior vena cava is displayed by hand-pushing angiography combined with rotating C-arm cut-off position, and the accurate direction of the hook is judged. The traction hook 3 is introduced through the guide catheter or catheter sheath, and the traction hook 3 is hooked on the layer of the basket adjacent to the hook or the groove of the hook. Whether the contact surface between the hook and the wall of the inferior vena cava is separated is judged by gently pulling the traction hook 3.
[0032] 2. If the retrieval hook and the inferior vena cava vessel wall contact surface cannot be separated, do not blindly pull to prevent the filter from moving, and try to twist the control and push the hook 3 upwards, so that the retrieval hook and the inferior vena cava vessel wall contact surface should be separated.
[0033] 3. Remove the snare 1, introducer 4 and torque device, insert the distal end of the introducer 4 into the catheter seat of the snare catheter 2, assemble the snare 1 and the snare catheter 2 to form a separate assembly; push the entire separate assembly of the snare 1 and the snare catheter 2 into the guide catheter or catheter sheath, gently push the snare 1 shaft forward to fully open the snare loop, and slowly guide the snare loop below the parietal retrieval hook.
[0034] 4. As in step 2, operate the hook 3 to separate the retrieval hook and the inferior vena cava vessel wall contact surface, quickly push the snare loop through the gap between the two to capture the layer of basket adjacent to the retrieval hook or the retrieval hook of the inferior vena cava filter, withdraw the hook 3, advance the snare catheter 2, contract the snare loop, and make the snare 1 capture the retrieval hook of the inferior vena cava filter.
[0035] 5. Move the snare 1 and the snare catheter 2 together, remove them from the guide catheter or catheter sheath, or withdraw them together with the guide catheter or catheter sheath from the body.
[0036] Example Four: 1. Preliminary judgment of the parietal side of the inferior vena cava filter retrieval hook is made by fluoroscopy, and the retrieval hook is excluded from the proximal end of the inferior vena cava filter retrieval hook. The minimum gap between the layer of basket adjacent to the retrieval hook and the inferior vena cava wall on the parietal side of the retrieval hook is displayed by hand-pushing angiography combined with rotating C-arm tangential position, and the accurate direction of the parietal retrieval hook is determined. The hook 3 is introduced below the inferior vena cava filter retrieval hook through the guide catheter or catheter sheath.
[0037] 2. Remove the snare 1, introducer 4 and torque device, insert the distal end of the introducer 4 into the catheter seat of the snare catheter 2, assemble the snare 1 and the snare catheter 2 to form a separate assembly; push the entire separate assembly of the snare 1 and the snare catheter 2 into the guide catheter or catheter sheath, until the hook 3 is below the guide catheter or catheter sheath.
[0038] 3. Adjust the hook 3 and the distal end of the snare catheter 2, i.e. the tail end, together to push against the vessel wall on the parietal side of the inferior vena cava filter retrieval hook, determine the separation of the retrieval hook and the inferior vena cava vessel wall contact surface in tangential position, and quickly push the snare 1 shaft to open the snare loop, push the snare loop through the gap between the two to capture the layer of basket adjacent to the retrieval hook or the retrieval hook of the inferior vena cava filter.
[0039] 4. Withdraw the hook 3, advance the snare catheter 2, contract the snare loop, and make the snare 1 capture the retrieval hook of the inferior vena cava filter.
[0040] 5. Simultaneously move the snare 1 and the snare catheter 2 into the guide catheter or catheter sheath and take out, or exit together with the guide catheter or catheter sheath.
[0041] Example Five: 1. Pushing angiography combined with rotating C-arm shows the minimum gap between the layer of the basket adjacent to the retrieval hook of the IVC filter and the wall of the IVC, judging the direction of the retrieval hook. Through the guide catheter or catheter sheath, introduce the traction hook 3 from the middle of the layer of the basket adjacent to the retrieval hook of the filter, so that the layer of the basket adjacent to the retrieval hook is divided into two symmetrical parts.
[0042] 2. Remove the snare 1, the introducer 4 and the torque device, insert the distal end of the introducer 4 into the catheter seat of the snare catheter 2, assemble the snare 1 and the snare catheter 2 to form a separate assembly; push the entire separate assembly of the snare 1 and the snare catheter 2 into the guide catheter or catheter sheath, and gently push the snare 1 shaft forward to make the snare loop completely open and cover the traction hook 3.
[0043] 3. Pull the other end of the snare 1 and the snare catheter 2 and the traction hook 3, confirm that the retrieval hook of the IVC filter moves into the guide catheter or catheter sheath, and continue to pull to make the IVC filter completely enter the guide catheter or catheter sheath and take it out, or exit together with the guide catheter or catheter sheath.
[0044] 4. Or pull the traction hook 3 out of the body, remove the snare 1 and the snare catheter 2, pull the two ends of the traction hook 3, confirm that the retrieval hook of the IVC filter moves into the guide catheter or catheter sheath, and continue to pull to make the IVC filter completely enter the guide catheter or catheter sheath and take it out, or exit together with the guide catheter or catheter sheath.
[0045] Example Six: 1. Pushing angiography combined with rotating C-arm shows the minimum gap between the layer of the basket adjacent to the retrieval hook of the IVC filter and the wall of the IVC, judging the direction of the retrieval hook. Through the guide catheter or catheter sheath, introduce a 0.035 inch 260 cm super-smooth guide wire from the middle of the layer of the basket adjacent to the retrieval hook of the filter, so that it is divided into two symmetrical parts.
[0046] 2. Remove the snare 1, the introducer 4 and the torque device, insert the distal end of the introducer 4 into the catheter seat of the snare catheter 2, assemble the snare 1 and the snare catheter 2 to form a separate assembly; push the entire separate assembly of the snare 1 and the snare catheter 2 into the guide catheter or catheter sheath, and gently push the snare 1 shaft forward to make the snare loop completely open and cover the traction hook 3.
[0047] 3. Remove snare 1 and snare catheter 2, pull both ends of the 0.035 inch 260 cm super- slippery guide wire, confirm the retrieval hook of the IVC filter is inside the guiding catheter or catheter sheath, continue to pull until the IVC filter is completely inside the guiding catheter or catheter sheath and remove it, or remove it together with the guiding catheter or catheter sheath.
[0048] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other present or future devices, systems, compositions, methods, etc. can employ. For example, it should be understood that the terms "including" as well as changes such as "comprising," "composed of," "containing," "having," and "involving" and the like are specifically intended to be open-ended and to mean that items following each of these terms need not be an exhaustive listing of items. Moreover, any reference to prior art in this specification is not, and should not be taken as, an acknowledgment or any form of suggestion that this prior art forms part of the common general knowledge in the art in any country internationally.
[0049] The preferred embodiments of the application disclosed above are only to help explain the principles of the present application. The preferred embodiments do not limit the present application to only the specific embodiments described. Obviously, many modifications and variations of this application are possible in light of this teaching. It is intended that the scope of the application be limited not by this detailed description, but rather by the claims and the full range of equivalents to which they are entitled.
Claims
1. A capture device for an inferior vena cava filter, comprising an introducer (4), characterised in that: The inside of the introducer (4) movably installs a snare catheter (2), the inside of the snare catheter (2) movably installs a snare (1), the inside of the introducer (4) movably installs a traction hook (3), the end surface of the snare catheter (2) and the end surface of the traction hook (3) are both installed with a torque device (5), the inside of the snare catheter (2) movably installs a snare (1), the traction hook (3) is internally provided with an inverted "U" type hook.
2. The use of a device for capturing an inferior vena cava filter, according to claim 1, characterized in that: It comprises the following steps: S1, first introduce the traction hook (3) through the guide catheter, make the traction hook (3) hook the filter adjacent to the recovery hook The layer of basket, gently pull the traction hook (3) to determine whether the recovery hook and the lower vena cava vessel wall contact surface can be separated; S2, when the recovery hook and the lower vena cava vessel wall contact surface can be separated, the distal end of the introducer (4) is inserted into the catheter seat of the snare catheter (2), the snare (1) and the snare catheter (2) are assembled to form a separation assembly, the separation assembly is the snare (1) and the snare catheter (2) assembly, the introducer (4) is withdrawn, the torque device is introduced into the proximal end of the snare (1), the snare loop of the snare (1) passes through the proximal end of the traction hook (3), the whole separation assembly is pushed to the guide catheter along the traction hook (3) until the snare loop is located below the lower vena cava filter; S3, gently push the snare (1) shaft to make the snare loop completely open, and slowly guide the snare loop to the lower side of the abutting recovery hook; S4, gently pull the traction hook (3) to make the recovery hook and the lower vena cava vessel wall contact surface separate, quickly push the snare loop up through the gap between the two to cover the lower vena cava filter adjacent to the recovery hook The layer of basket, the traction hook (3) is withdrawn, the snare catheter (2) is pushed forward, the snare loop is contracted, the snare (1) is tightly covered on the recovery hook of the lower vena cava filter, and the snare (1) and the snare catheter (2) are moved together, which are removed after being moved into the guide catheter, and the catheter sheath is withdrawn from the body; S5, when the recovery hook and the lower vena cava vessel wall contact surface cannot be separated, do not blindly pull to prevent the filter from moving, try to control and push the traction hook (3) upward, the recovery hook and the lower vena cava vessel wall contact surface should be separated; S6, the distal end of the introducer (4) is inserted into the catheter seat of the snare catheter (2), the snare (1) and the snare catheter (2) are assembled to form a separation assembly, the introducer (4) is withdrawn, the torque device is introduced into the proximal end of the snare (1), the whole separation assembly is pushed to the guide catheter, the snare (1) shaft is gently pushed forward to make the snare loop completely open, and the snare loop is slowly guided to the lower side of the abutting recovery hook; S7, operate the traction hook (3) to make the recovery hook and the lower vena cava vessel wall contact surface separate, quickly push the snare loop up through the gap between the two to cover the lower vena cava filter adjacent to the recovery hook The layer of basket, the traction hook (3) is withdrawn, the snare catheter (2) is pushed forward, the snare loop is contracted, and the snare (1) is tightly covered on the recovery hook of the lower vena cava filter; S8, the snare (1) and the snare catheter (2) are moved together, which are removed after being moved into the guide catheter, and the catheter sheath is withdrawn from the body.