A recovery device

Abstract

This invention provides a retrieval device, comprising: an inner tube assembly including a first tube body, a second tube body, and a third tube body; the first tube body having a first lumen and a second lumen that are isolated from each other; the second tube body movably passing through the first lumen, with its proximal end extending out of the first lumen; the third tube body movably passing through the second lumen, with its proximal end extending out of the second lumen, and the third tube body having a third lumen; a retrieval sheath disposed on the proximal outer peripheral surface of the second tube body, forming a retrieval cavity between the retrieval sheath and the outer peripheral surface of the second tube body, the distal end of the retrieval sheath forming an opening communicating with the retrieval cavity; and an outer tube movably sleeved on the outer peripheral surface of the inner tube assembly, and also used to cover the retrieval sheath. This retrieval device can enter the vena cava from the femoral vein and then be used to retrieve filters, offering the advantage of high safety.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a recycling device. Background Technology

[0002] Venous thromboembolism (VTE) is a common clinical condition with high morbidity and mortality. VTE includes deep vein thrombosis (DVT) and pulmonary embolism (PE). DVT commonly occurs in the veins of the lower extremities, while PE is mainly caused by a thrombus that forms in the venous system or right heart and then detaches and enters the pulmonary artery. Anticoagulation therapy has always been the gold standard for VTE treatment, aiming to prevent thrombus formation and restore patency of the embolized vein. However, when patients have contraindications to anticoagulation or experience bleeding complications that necessitate discontinuation of anticoagulation, implantation of a vena cava filter (VCF) can effectively intercept detached thrombi and prevent fatal pulmonary embolism.

[0003] Early inferior vena cava filters were mostly permanent, but their main drawback was the high risk of long-term complications such as inferior vena cava obstruction. In recent years, retrievable filters have gradually become the mainstream. After the patient's risk of pulmonary embolism (PE) has been eliminated, the filter can be retrieved to avoid long-term complications caused by long-term implantation. They also offer advantages such as better thrombus capture and lower cost. Retrievable filters mainly include fusiform filters and umbrella-shaped filters. Compared to fusiform filters, umbrella-shaped filters have a smaller contact area with the vessel wall, a longer retrieval time window, and cause less damage to the vessel wall during retrieval. Furthermore, recent structural improvements in umbrella-shaped filters have resulted in increasingly superior centering performance, making them the main development trend for retrievable filters.

[0004] Due to limitations in the placement of umbrella-shaped filters within the inferior vena cava, the principle of filter retrieval, and retrieval techniques, most existing umbrella-shaped filters are retrieved via the jugular vein. However, due to the complex anatomy of the neck, puncturing the jugular vein can easily injure the carotid artery or enter the vertebral artery or pleural cavity. Furthermore, even if the puncture is successful, there are still issues regarding how to maneuver the guidewire and catheter around the heart to reduce the probability of inducing arrhythmias. Therefore, the jugular vein retrieval method carries a high surgical risk. Summary of the Invention

[0005] The purpose of this invention is to provide a recycling device to improve the safety of existing recycling devices when recycling umbrella filters.

[0006] To achieve the above objectives, the present invention provides a recycling device, comprising:

[0007] An inner tube assembly includes a first tube body, a second tube body, and a third tube body; the first tube body has a first lumen and a second lumen that are isolated from each other; the second tube body is movably passed through the first lumen, and the proximal end of the second tube body extends out of the first lumen; the third tube body is movably passed through the second lumen, and the proximal end of the third tube body extends out of the second lumen, and the third tube body has a third lumen;

[0008] A recovery sheath is disposed on the proximal outer peripheral surface of the second tube body, a recovery cavity is formed between the recovery sheath and the outer peripheral surface of the second tube body, and an opening communicating with the recovery cavity is formed at the distal end of the recovery sheath; and,

[0009] The outer tube is movably fitted onto the outer circumferential surface of the inner tube assembly and also serves to cover the recycling sheath.

[0010] Optionally, the distal end of the recovery sheath is formed into a blade.

[0011] Optionally, the height of the recovery chamber gradually decreases from the distal end to the proximal end.

[0012] Optionally, the slope of the wall of the recovery chamber is less than or equal to 10°.

[0013] Optionally, the height of the recovery chamber is 2.5 mm to 5 mm; and / or the length of the recovery chamber is 50 mm to 100 mm.

[0014] Optionally, the recovery device further includes a catcher that is movably inserted through the third lumen and extends partially from the proximal end of the third lumen; the outer tube is also used to cover the portion of the catcher extending from the proximal end of the third lumen.

[0015] Optionally, the catcher includes a fourth tube, a traction member, and a catching ring; the fourth tube has a fourth cavity extending axially, and the fourth tube has a straightened state and a bent state; the traction member is movably inserted into the fourth cavity; the catching ring is connected to the proximal end of the traction member and extends at least partially out of the fourth cavity.

[0016] Optionally, the recovery device further includes a protection mechanism disposed on the second tube body and located proximal to the recovery sheath; the protection mechanism is configured to have an expanded state and a contracted state, and includes a support frame and a filter element; the support frame includes a plurality of first support rods arranged circumferentially spaced along the second tube body, with the proximal ends of all the first support rods converged and connected to the second tube body, and the distal ends of the plurality of first support rods converged and connected to the second tube body; the filter element is attached to the support frame and covers the proximal portion of the support frame, with the distal end of the filter element used to at least partially abut against the wall of the target lumen; the outer tube is also used to cover the protection mechanism so that the protection mechanism switches from the expanded state to the contracted state.

[0017] Optionally, the support frame further includes a support ring, the axial projection of which is circular, and the support ring is coaxially arranged with the second tube and connected to multiple first support rods; the filter element covers the portion of the support frame located on the proximal side of the support ring, and the distal end of the filter element is attached to the support ring.

[0018] Optionally, the outer tube includes a main body section and a flared section. The flared section is located at the proximal end of the main body section. The inner diameter of the flared section gradually increases from the distal end to the proximal end, and the hardness of the flared section is less than that of the main body section.

[0019] Optionally, the recovery device further includes a guide head connected to the proximal end of the second tube.

[0020] Compared with the prior art, the recycling device of the present invention has the following advantages:

[0021] First, the recovery device includes an inner tube assembly, a recovery sheath, and an outer tube. The inner tube assembly includes a first tube body, a second tube body, and a third tube body. The first tube body has a first cavity and a second cavity that extend axially and are isolated from each other. The second tube body movably passes through the first cavity, and its proximal end extends out of the first cavity. The third tube body movably passes through the second cavity, and its proximal end extends out of the second cavity. The third tube body has a third cavity that extends axially. The recovery sheath is disposed on the proximal outer circumferential surface of the second tube body, forming a recovery cavity between the recovery sheath and the outer circumferential surface of the second tube body. The distal end of the recovery sheath forms an opening communicating with the recovery sheath. The outer tube is movably sleeved on the outer circumferential surface of the inner tube assembly and also serves to cover the recovery sheath. Since the recovery sheath is disposed on the proximal outer circumferential surface of the second tube body, and the distal end of the recovery cavity is open, the proximal end of the third tube body can be positioned on the distal side of the recovery sheath by adjusting the relative positions of the second tube body and the third tube body. Therefore, the retrieval device can be inserted into the vena cava via the femoral vein and used to introduce a catcher to retrieve the filter. Specifically, when the proximal end of the retrieval sheath and the third tube is exposed outside the proximal end of the outer tube, and the retrieval sheath is located on the proximal side of the filter, the catcher can be inserted into the vena cava through the third lumen and used to catch the filter. Then, by retracting the second tube, the filter is drawn into the retrieval lumen. Finally, the entire inner tube assembly is retracted until the inner tube assembly, carrying the filter and the catcher, enters the outer tube. Finally, the outer tube, the inner tube assembly, the catcher, and the filter can be withdrawn from the body as a whole. This retrieval device retrieves the filter via the femoral vein approach, reducing surgical risks and improving safety while ensuring normal filter retrieval.

[0022] Secondly, the distal end of the recovery sheath forms a blade. During the process of retrieving the filter into the recovery chamber, the blade can be used to cut the vascular endothelium covering the filter, thereby separating the filter from the blood vessel wall, removing the obstruction caused by the vascular endothelium to the filter recovery, improving the success rate of filter recovery, and reducing the risk of blood vessel tearing.

[0023] Third, the recovery device also includes a protection mechanism, which is sleeved on the second tube and located on the proximal side of the recovery sheath. The protection mechanism is used to intercept thrombi that fall off the filter during the recovery process, preventing thrombi from entering the heart with the blood flow and then flowing into the pulmonary artery, thus avoiding risks and further improving the safety of the filter recovery process.

[0024] Fourth, the outer tube includes a main body section and a flared section located at the proximal end of the main body section. The inner diameter of the flared section gradually increases from the distal end to the proximal end, and the hardness of the flared section is less than that of the main body section. This is done to prevent the anti-displacement hook of the filter exposed outside the retrieval chamber from getting stuck at the proximal end of the outer tube when the inner tube assembly carries the filter into the outer tube, thus preventing the proximal end of the inner tube assembly from entering the outer tube. On the other hand, the flared section with lower hardness will not adversely affect the movement of the retrieval device in the blood vessel. Attached Figure Description

[0025] The accompanying drawings are provided to better understand the invention and are not intended to unduly limit the scope of the invention. Wherein:

[0026] Figure 1 This is a schematic diagram of the recycling device provided in Embodiment 1 of the present invention;

[0027] Figure 2 This is a schematic diagram of the use scenario of the recycling device provided by the present invention according to an embodiment. In the figure, the filter is in the center and is captured by the catcher, but has not yet been put into the recycling chamber.

[0028] Figure 3 This is a schematic diagram of a usage scenario of the recycling device provided by the present invention according to an embodiment, in which the filter is drawn into the recycling chamber;

[0029] Figure 4 This is a schematic diagram of the use scenario of the recycling device provided by the present invention according to an embodiment. In the figure, the inner tube assembly is completely retracted into the outer tube, and the recycling sheath, the third tube body, the catcher and the filter are not shown.

[0030] Figure 5 This is a schematic diagram of a usage scenario of the recycling device provided by the present invention according to an embodiment, in which the filter is slightly tilted;

[0031] Figure 6 This is a schematic diagram of a usage scenario of the recycling device provided by the present invention according to an embodiment, in which the near end of the filter is attached to the wall;

[0032] Figure 7 This is a partial structural schematic diagram of a recycling device provided according to an embodiment of the present invention. The diagram shows the connection relationship between the recycling sheath and the second tube, and the recycling chamber has a uniform height along its entire length.

[0033] Figure 8 This is a partial structural schematic diagram of a recovery device provided according to an embodiment of the present invention. The diagram shows the connection relationship between the recovery sheath and the second tube, and the height of the recovery chamber gradually decreases from the distal end to the proximal end.

[0034] Figure 9This is a schematic diagram of the axial projection of the second tube and the recovery sheath of the recovery device provided according to an embodiment of the present invention;

[0035] Figure 10 This is a partial cross-sectional view of a recycling device provided according to an embodiment of the present invention;

[0036] Figure 11 This is a schematic diagram of the recycling device provided in Embodiment 2 of the present invention;

[0037] Figure 12 This is a schematic diagram of the recycling device provided in Embodiment 3 of the present invention;

[0038] Figure 13 This is a schematic diagram of the usage scenario of the recycling device provided in Embodiment 3 of the present invention.

[0039] [The annotations in the attached figures are explained below]:

[0040] 10-Recovery device, 100-Inner tube assembly, 110-First tube body, 120-Second tube body, 130-Third tube body, 131-Outlet, 200-Recovery sheath, 211-Blade, 210-Side wall, 220-Bottom wall, 201-Recovery chamber, 300-Outer tube, 310-Main body section, 320-Flanged section, 400-Catcher, 410-Fourth tube body, 420-Catching ring, 500-Guide head, 600-Protective mechanism, 610-Support frame, 611-First support rod, 612-Support ring, 620-Filter element, 630-Proximal connector, 640-Distal connector;

[0041] 20 - Filter, 21 - Recycling hook. Detailed Implementation

[0042] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show components related to the present invention and are not drawn according to the actual number, shape, and size of components in the actual implementation. In the actual implementation, the type, quantity, and proportion of each component can be arbitrarily changed, and the component layout may also be more complex.

[0043] Furthermore, while each embodiment described below possesses one or more technical features, this does not imply that users of the present invention must simultaneously implement all technical features in any embodiment, or can only separately implement some or all technical features in different embodiments. In other words, provided it is feasible, those skilled in the art can, based on the disclosure of the present invention and depending on design specifications or implementation requirements, selectively implement some or all technical features in any embodiment, or selectively implement a combination of some or all technical features in multiple embodiments, thereby increasing the flexibility in implementing the present invention.

[0044] As used herein, the singular forms “a,” “an,” and “the” include plural objects, and the plural form “a plurality” includes two or more objects, unless otherwise expressly indicated. As used herein, the term “or” is generally used to include the meaning of “and / or,” unless otherwise expressly indicated, and the terms “install,” “connect,” and “link” should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Connections can be mechanical or electrical. Connections can be direct or indirect through an intermediate medium, and can represent internal communication between two elements or an interaction between two elements. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] In this article, the terms “proximal” and “distal” refer to the relative orientation, position, and direction of the components or actions relative to each other from the perspective of the heart during the use of the medical device. Although “proximal” and “distal” are not restrictive, “proximal” generally refers to the end of the medical device that is closer to the heart during normal operation, while “distal” generally refers to the end that is farther away from the heart.

[0046] To make the objectives, advantages, and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clearly illustrate the objectives of the embodiments of the present invention. The same or similar reference numerals in the drawings represent the same or similar parts.

[0047] <Example 1>

[0048] Figure 1 A schematic diagram of the structure of the recycling device 10 provided in this embodiment is shown. Figure 1As shown, the recovery device 10 includes an inner tube assembly 100, a recovery sheath 200, and an outer tube 300. The inner tube assembly 100 includes a first tube body 110, a second tube body 120, and a third tube body 130. The first tube body 110 has a first cavity (not shown) and a second cavity (not shown) that are isolated from each other. The second tube body 120 movably passes through the first cavity, and its proximal end extends out of the first cavity. The third tube body 130 movably passes through the second cavity, and its proximal end extends out of the second cavity. The third tube body 130 also has a third cavity (not shown). The recovery sheath 200 is disposed on the proximal outer peripheral surface of the second tube body 120, and a recovery cavity 201 is formed between the recovery sheath 200 and the outer peripheral surface of the second tube body 120. The distal end of the recovery sheath 200 forms an opening communicating with the recovery cavity 201. The outer tube 300 is movably sleeved on the outer peripheral surface of the inner tube assembly 100 and is also used to cover the recovery sheath 200.

[0049] The recovery device 10 has a first state and a second state. In the first state, the outer tube 400 encloses the proximal end of the inner tube assembly 100 and the recovery sheath 200, and preferably the proximal end of the second tube body 120 is located on the proximal side of the third tube body 130. In the second state, the proximal ends of the second tube body 120, the recovery sheath 200, and the third tube body 130 are exposed outside the proximal end of the outer tube 400, and the proximal end of the first tube body 110 may be located outside the proximal end of the outer tube 300 or inside the outer tube 300.

[0050] The recovery device 10 can enter the vena cava from the femoral vein to recover the filter 20 (e.g., ...) disposed in the vena cava. Figures 2 to 6 (As shown). The specific usage process may include the following steps:

[0051] Step S1: The retrieval device 10 in the first state is inserted into the vena cava via femoral vein puncture, preferably with the proximal end of the retrieval device 10 located on the proximal side of the filter 20.

[0052] Step S2: Control the outer tube 300 to move from the proximal end to the distal end so that the recycling device 10 switches to the second state.

[0053] Step S3: A capture device 400 is introduced into the vena cava through the third lumen, and the position of the capture device 400 is adjusted so that the filter 20 (e.g., the filter 20 of the capture device 400) is positioned within the filter 20. Figure 2 (As shown).

[0054] Step S4: Adjust the relative positions of the second tube 120 and the third tube 130 so that the distal opening of the recovery sheath 200 faces the third tube 130. Then, keep the third tube 130 stationary and control the second tube 120 to move relative to the third tube 130 from proximal to distal end, so that the distal end of the recovery sheath 200 contacts the outer surface of the filter 20 and radially presses the filter 20, thereby causing the filter 20 to radially contract and at least partially enter the recovery chamber 201 (e.g., Figure 3 (As shown).

[0055] Step S5: Keep the catcher 400 stationary and control the entire inner tube assembly 100 to move from the proximal end to the distal end until the proximal end of the inner tube assembly 100 is completely inserted into the outer tube 300. At this time, the retrieval sheath 200 and the proximal end of the catcher 400 are also wrapped by the outer tube 300 (e.g., Figure 4 (As shown).

[0056] Step S6: Remove the outer tube 300, the inner tube assembly 100, the catcher 400, and the caught filter 20 together from the body to complete the recovery of the filter 20.

[0057] The retrieval device 10 enters the vena cava via femoral vein puncture, avoiding the risks of injury to the carotid artery, vertebral artery, and chest cavity caused by the complex anatomy of the jugular vein when using the jugular vein approach. It also avoids passing through the heart, preventing the retrieval device 10 from entering the heart and inducing arrhythmia. In other words, the retrieval device 10 provided in this embodiment enters the vena cava via the femoral vein, offering greater safety.

[0058] Alternatively, please continue to refer to Figures 2 to 6 The catcher 400 includes a fourth tube 410, a traction member (not shown), and a catching ring 420. The fourth tube 410 has a fourth lumen (not shown), the traction member is movably inserted into the fourth lumen, and the catching ring 420 is connected to the proximal end of the traction member and at least partially extends out of the fourth lumen. In step S3, the fourth tube 410 movably passes through the third lumen, and the proximal end of the fourth tube 410 extends out of the third lumen, such that the catching ring 420 is at least partially located outside the proximal end of the third lumen. In this embodiment, the catching ring 420 can extend completely out of the fourth lumen, so that the catching ring 420 is entirely located outside the proximal end of the third lumen.

[0059] More preferably, the fourth tube 410 has a straightened state and a bent state, and the practitioner can control the fourth tube 410 to switch between the straightened state and the bent state. It is understood that the practitioner can use any suitable method to control the bending of the fourth tube 410. For example, the fourth tube 410 has at least two lumens, that is, the fourth tube 410 may also have a fifth lumen (not shown in the figure) arranged parallel to and isolated from the fourth lumen. A control rope (not shown in the figure) is inserted in the fifth lumen, and the proximal end of the control rope is connected to the fourth tube 410, while the distal end of the control rope extends outside the body. The practitioner controls the straightening or bending of the fourth tube 410 by manipulating the control rope. The maximum bending angle of the fourth tube 410 can be 30° to 150°.

[0060] Thus, in step S3, the operator can adjust the position of the catcher 400 by pushing, pulling back, rotating, or bending the fourth tube 410, and / or by pushing, pulling back, or rotating the traction member, until the catching ring 420 is fitted onto the retrieval hook 21 at the proximal end of the filter 20 to catch the filter 20. It can be understood that after the catching ring 420 is fitted onto the retrieval hook 21 of the filter 21, the operator can also pull back the traction member or push the fourth tube 410 to tighten and lock the catching ring 420 onto the filter 20. Here, "pushing" refers to controlling the corresponding component to move from the distal end to the proximal end, and "pulling back" refers to controlling the corresponding component to move from the proximal end to the distal end.

[0061] Furthermore, in step S4, the practitioner can adjust the relative positions of the second tube 120 and the third tube 130 by pushing, pulling, and rotating the first tube 120 and / or pushing, pulling, and rotating the third tube 130. Additionally, if the distal opening of the recovery chamber 201 faces the third tube 130 after step S3 is completed, then there is no need to adjust the positions of the second tube 120 and / or the third tube 130 in step S4. Moreover, after step S4 is completed, depending on the actual situation, the filter 20 can enter the recovery chamber 201 completely or partially, for example, the distal end of the filter 201 may not enter the recovery chamber 201.

[0062] In some cases, such as Figure 2As shown, the filter 20 is centrally located in the vena cava. "Centered" means that the axis of the filter 20 is substantially coincident with the axis of the vena cava. Therefore, when performing step S1, the retrieval device 10 can be located on either side of the filter 20. Furthermore, because the retrieval sheath 200 is eccentrically positioned relative to the second tube 120, the filter 20 can be retracted into the retrieval chamber 201 without tilting. In other cases, such as... Figure 5 As shown, the filter 20 is slightly tilted. Here, when performing step S1, the recovery device 10 can be positioned closer to the proximal end of the filter 20, so as to... Figure 5 As shown in the example, if the filter 20 is slightly tilted to the left, then the recycling device 10 can be located to the left of the filter 20. Figure 2 and Figure 5 In the scenario shown, when step S3 is completed, the proximal end of the filter 20 is relatively close to the outer peripheral surface of the third tube 130, thus the distal end of the recovery sheath 201 easily contacts the outer surface of the filter 20 and retracts the filter 20 into the recovery chamber 201. In other cases, please refer to... Figure 6 When the filter 20 is severely tilted to the point that its proximal end is pressed against the blood vessel wall, step S1 can only be performed with the recovery device 10 positioned on the side of the filter 20 furthest from the blood vessel wall. Figure 6 Taking the illustrated orientation as an example, with the proximal end of the filter 20 resting against the right side of the blood vessel wall, the retrieval device 10 can only be placed on the left side of the filter 20. Thus, when the catcher 400 catches the proximal end of the filter 20, the distance between the proximal end of the filter 20 and the outer peripheral surface of the third tube 130 is relatively large, which is not conducive to the distal end of the retrieval sheath 200 contacting the surface of the filter 20. To address this, after step S3 and before step S4, the operator can also perform step S31: controlling the movement of the catcher 400, typically keeping the fourth tube 410 and the traction member relatively stationary, and then pulling back the fourth tube 410 to pull back the entire catcher 400, thereby causing the proximal end of the filter 20 to move in a direction close to the third tube 130, and causing the proximal end of the filter 20 to come into contact with the outer peripheral surface of the third tube 130.

[0063] Furthermore, in this embodiment, those skilled in the art should understand that the first lumen and the second lumen extend axially through the first tube body 110. The third lumen extends axially along the third tube body 130, and the proximal end of the third tube body 130 is provided with an outlet 131 communicating with the third lumen, allowing the catcher 400 to exit from the proximal end of the third lumen. The outlet 131 can be located at the proximal end of the third tube body 130, or it can be located on the proximal outer circumferential surface of the third tube body 130 (e.g., ...). Figure 1 (As shown). The fourth lumen extends through the fourth tube body 410 along its axial direction, and the fifth lumen extends along the axial direction of the fourth tube body 410.

[0064] Further, please refer to Figure 7 and Figure 8 The distal end of the recovery sheath 200 forms a blade 211, which is sharp and capable of cutting. In step S4, the distal end of the recovery sheath 200 contacts the outer surface of the filter 20. When the outer surface of the filter 20 is covered with vascular endothelium, the blade 211 can cut the vascular endothelium, thereby separating the filter 20 from the blood vessel wall and preventing damage to the blood vessel wall during the process of retracting the filter 20 into the recovery chamber 201. The recovery sheath 200 can be made of metal, such as nickel-titanium alloy or stainless steel.

[0065] Optionally, the recovery sheath 200 extends axially along the second tube body 120, such that the recovery chamber 201 also extends axially along the second tube body 120. Please return to reference. Figure 1 and combined Figure 10 The recovery sheath 200 may include a sidewall 210 and a bottom wall 220. The sidewall 210 extends axially along the second tube 120, and the distal end of the sidewall 210 is the distal end of the recovery sheath 200. The bottom wall 220 is disposed at the proximal end of the sidewall 210, so that the proximal end of the recovery chamber 201 is closed. Therefore, in step S4, when the proximal end of the filter 20 abuts against the bottom wall 220, the second tube 120 cannot continue to move relative to the third tube 130 in the proximal-to-distal direction, thereby confirming that step S4 has been completed. And when the length L of the recovery chamber 201 (e.g., ...) Figure 10When the length L of the filter 20 in its compressed state is greater than or equal to the length of the filter 20, the filter 20 can be completely absorbed into the recovery chamber 201. When the length L of the recovery chamber 201 is less than the length of the filter 20 in its compressed state, the filter 20 can be partially absorbed into the recovery chamber 201, and the distal end of the filter 20 is exposed outside the distal end of the recovery chamber 201. The length of the recovery chamber 201 refers to the axial dimension of the recovery chamber 201 in the second tube 120, and its value can be 50mm to 100mm, depending on the actual situation.

[0066] The cross-section of the sidewall 210 can be semi-circular, U-shaped, or other similar shapes. The cross-section refers to the section perpendicular to the axis of the second tube 120. Furthermore, the thickness of the sidewall 210 and the bottom wall 220 can be 0.1 mm to 1.0 mm.

[0067] For further information, please refer back to the reference section. Figure 7 In some alternative implementations, the recovery chamber 201 has a uniform height H (e.g., 7 to 100 mm) over the entire length of the recovery sheath 200 (i.e., the axial dimension of the recovery sheath 200 in the second tube 120). Figure 10 As indicated, the height H of the recovery chamber 201 refers to the maximum radial dimension of the recovery chamber 201 within the second tube body 120. In some alternative implementations, the height H of the recovery chamber 201 gradually decreases from the distal end to the proximal end; that is, the distal opening of the recovery chamber 201 is larger, which is more conducive to the filter 20 entering the recovery chamber 201. The height H of the recovery chamber 201 can be 2.5 mm to 5 mm.

[0068] It is understood that when the recovery chamber 201 has a uniform height H over the entire length of the recovery sheath 200, the slope of the chamber wall of the recovery chamber 201 is 0. The slope of the chamber wall of the recovery chamber 201 refers to the acute angle α formed by the inner contour line of the side wall of the recovery sheath 200 and the axis of the second tube 120 on a cross-section passing through the axis of the second tube 120 and the axis of the recovery sheath 200 (e.g., ...). Figure 10 The angle (as indicated) is such that the acute angle α of the opening faces the distal end of the second tube 120. When the height H of the recovery chamber 201 gradually decreases from the distal end to the proximal end, the slope of the chamber wall of the recovery chamber 201 is greater than 0°. Preferably, the slope of the chamber wall of the recovery chamber 201 is less than 10°, more preferably 5° to 10°.

[0069] Furthermore, as mentioned above, in some implementations, the distal end of the filter 20 cannot enter the recovery chamber 201. Specifically, for a filter 20 equipped with an anti-displacement hook, the anti-displacement hook typically cannot enter the recovery chamber 201. In view of this, the outer tube 300 used in this embodiment has a non-uniform inner diameter. Please refer to the reference section. Figure 1 and combined Figures 2 to 6 The outer tube 300 includes a main body section 310 and a flared section 320 disposed at the proximal end of the main body section 310. The inner diameter of the flared section 310 gradually increases from the distal end to the proximal end, so that the proximal end of the outer tube 300 forms a trumpet shape. The hardness of the flared section 320 is less than that of the main body section 310. This structure facilitates the entry of the anti-displacement hooks exposed on the distal exterior of the recovery chamber 201 into the outer tube 300, preventing these anti-displacement hooks from getting stuck at the proximal end of the outer tube 300, which would prevent the proximal ends of the recovery sheath 200 and the inner tube assembly 100 from entering the interior of the outer tube 300. This also prevents the anti-displacement hooks from scratching the blood vessel wall during the overall removal of the recovery device 10, the catcher 400, and the filter 20 from the body. In addition, the hardness of the flared section 320 is less than that of the main body section 310, making the flared section 320 easy to deform and not hindering the movement of the recovery device 10 in the blood vessel.

[0070] Alternatively, please continue to refer to Figure 1 and combined Figures 2 to 6 The recovery device 10 may further include a guide head 500, which is connected to the proximal end of the second tube 120. The outer diameter of the guide head 500 may decrease from the distal end to the proximal end, that is, the proximal end of the guide head 500 forms a tip. Furthermore, in step S5, preferably, the guide head 500 also enters the interior of the outer tube 300 (e.g., Figure 4 (As shown).

[0071] <Example 2>

[0072] like Figure 11 As shown, the difference between this embodiment and Embodiment 1 is that the retrieval device 10 includes the catcher 400, and the catcher 400 is pre-installed on the third tube 130. Specifically, the catcher 400 movably passes through the third tube lumen and partially extends from the proximal end of the third tube lumen. When the retrieval device 10 is in the first state, the outer tube 300 also covers the portion of the catcher 400 extending from the proximal end of the third tube lumen. When the retrieval device 10 is in the second state, the portion of the catcher 10 extending from the proximal end of the third tube lumen is exposed outside the proximal end of the outer tube 300.

[0073] Thus, when the recovery device 10 provided in this embodiment is used, the capture device 400 is introduced into the vena cava in step S1. Therefore, in step S3, the operator can directly adjust the position of the capture device 400 and the filter 20 of the capture device 400.

[0074] Compared to Embodiment 1, in this embodiment, the capture device 400 is pre-installed on the third tube 130, so that the capture device 400 can be synchronously inserted into the vena cava along with the third tube 130, without the need for insertion during the operation, which helps to shorten the operation time.

[0075] <Example 3>

[0076] Please refer to Figure 12 The difference between this embodiment and Embodiment 1 is that the recovery device 10 further includes a protection mechanism 600. The protection mechanism 600 is used to intercept blood clots that fall off the filter 20 when the filter 20 is recovered, so as to prevent blood clots from flowing into the heart and then into the pulmonary artery with the blood flow, thereby further improving the safety of the filter recovery operation.

[0077] In detail, the protection mechanism 600 is disposed on the second tube body 120 and located on the proximal side of the recovery sheath 200 and the distal side of the guide head 500. The protection mechanism 600 is configured to retract or expand radially along the second tube body 120. The protection mechanism 600 includes a support frame 610 and a filter element 620. The support frame 610 includes at least a plurality of first support rods 611, the proximal ends of which converge and connect to the second tube body 120, and the distal ends of which also converge and connect to the second tube body 120. Those skilled in the art will understand that the proximal ends of the first support rods 611, after convergence, can be directly connected to the second tube body 120, or they can be first connected to a proximal connector 630 (e.g., Figure 12 As shown), it is then connected to the second tube body 120 via the proximal connector 630. Similarly, the distal end of the first support rod 611 can be directly connected to the second tube body 120 after being retracted, or it can be first connected to a distal connector 640 (as shown). Figure 12 (as shown), and then connected to the second tube body 120 via the remote connector 640.

[0078] The filter element 620 is attached to the support frame 610 and covers the proximal portion of the support frame 610. When the protection mechanism 600 is in the expanded state, the distal end of the filter element 600 is used to at least partially abut against the wall of the target lumen, i.e., the vena cava, so that the filter element 600 can intercept thrombi.

[0079] The outer tube 300 is also used to cover the protective mechanism 600 when the recycling device 10 is in the first state. The support frame 610 is made of a highly elastic material, such as a shape memory alloy, and is pre-shaped to be in an expanded state. When the outer tube 300 covers the protective mechanism 600, the outer tube 300 applies a radially inward compressive force to the protective mechanism 600, causing the protective mechanism 600 to radially contract. When the outer tube 300 moves from the proximal end to the distal end to the second state, the protective mechanism 600 is exposed outside the proximal end of the outer tube 300. At this time, the outer tube 300 no longer applies the radial compressive force to the protective mechanism 600, and the support frame 610 returns to the expanded state under its high elasticity, so that the protective mechanism 600 is in the expanded state.

[0080] Therefore, the difference between the recovery device 10 provided in this embodiment and that in Embodiment 1 is that: when performing step S2, before the recovery sheath 200 is exposed from the proximal end of the outer tube 300, the protective mechanism 600 expands radially, and the distal end of the filter element 620 abuts against the wall of the vena cava located on the proximal side of the filter 20. In steps S3 and S4, the protective mechanism 600 remains in a radially expanded state to intercept thrombi (such as blood clots) that have detached from the filter 20. Figure 13 (As shown). And in step S5, when the proximal end of the inner tube assembly 100 is completely inside the outer tube 300, the protective mechanism 600 also enters the interior of the outer tube 300.

[0081] For further information, please continue to refer to [link / reference]. Figure 12 and Figure 13 The supporting frame 610 further includes a supporting ring 612, the axial projection of which is circular. The supporting ring 612 is coaxially arranged with the second tube body 120 and connected to multiple first supporting rods 611. The filter element 620 covers the portion of the supporting frame 610 located proximal to the supporting ring 612, and the distal end of the filter element 620 is attached to the supporting ring 612. This structure ensures that the axial projection of the distal end of the filter element 620 is also circular, with a shape substantially equivalent to the cross-section of the vena cava. Therefore, the distal end of the filter element 620 can be completely and tightly abutted against the wall of the vena cava, resulting in virtually no gaps between the distal end of the filter element 620 and the wall of the vena cava, reducing the possibility of thrombus escape and improving thrombus interception. The axial projection of the supporting ring 612 refers to its projection onto a plane perpendicular to its axis.

[0082] Furthermore, the support ring 612 includes multiple second support rods (not shown in the figure) connected end-to-end in sequence, with adjacent second support rods forming a V-shaped structure. This V-shaped structure can be a strictly geometric V-shape or an approximate V-shape. It is understood that the second support rods are also made of highly elastic materials such as shape memory alloys, and the V-shaped structure formed by adjacent second support rods facilitates the radial contraction of the support frame 610 when subjected to radially inward compressive force.

[0083] Optionally, the filter element 620 should allow blood to pass through. In this embodiment, the filter element 620 may be woven from polymer fibers or metal wires, wherein the woven mesh forms blood flow channels. Alternatively, the filter element 620 includes a membrane material (not shown in the figure) with a plurality of through holes (not shown in the figure) formed thereon, the through holes forming blood flow channels.

[0084] While the present invention has been disclosed above, it is not limited thereto. Those skilled in the art can make various modifications and variations to the present invention without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, the present invention also intends to include such modifications and variations.

Claims

1. A recycling device, characterized in that, include: The inner tube assembly includes a first tube body, a second tube body, and a third tube body; the first tube body is provided with a first cavity and a second cavity that are isolated from each other. The second tube can movably pass through the first lumen, and the proximal end of the second tube extends out of the first lumen; The third tube body is movably passed through the second lumen, and the proximal end of the third tube body extends out of the second lumen, the third tube body having a third lumen; A recovery sheath is disposed on the proximal outer peripheral surface of the second tube body, a recovery cavity is formed between the recovery sheath and the outer peripheral surface of the second tube body, and an opening communicating with the recovery cavity is formed at the distal end of the recovery sheath; a blade is formed at the distal end of the recovery sheath; and, An outer tube is movably fitted onto the outer circumferential surface of the inner tube assembly and also serves to cover the recovery sheath; the outer tube includes a main body section and a flared section, the flared section being disposed at the proximal end of the main body section, the inner diameter of the flared section gradually increasing from the distal end to the proximal end, and the hardness of the flared section being less than the hardness of the main body section.

2. The recycling apparatus of claim 1, wherein The height of the recovery chamber gradually decreases from the distal end to the proximal end.

3. The recycling apparatus of claim 2, wherein, The slope of the wall of the recovery chamber is less than or equal to 10°.

4. The recycling apparatus of any one of claims 1-3, wherein, The height of the recovery chamber is 2.5mm to 5mm; and / or the length of the recovery chamber is 50mm to 100mm.

5. The recycling apparatus of any one of claims 1-3, wherein, The recovery device also includes a catcher that is movably inserted through the third lumen and extends partially from the proximal end of the third lumen; the outer tube is also used to cover the portion of the catcher that extends from the proximal end of the third lumen.

6. The recycling apparatus of claim 5, wherein The catcher includes a fourth tube, a traction member, and a catching ring; the fourth tube has a fourth cavity extending axially, and the fourth tube has a straightened state and a bent state; the traction member is movably inserted into the fourth cavity; The capture ring is connected to the proximal end of the traction member and extends at least partially out of the fourth lumen.

7. The recycling apparatus of claim 1, wherein The recovery device further includes a protection mechanism disposed on the second tube and located proximal to the recovery sheath. The protection mechanism is configured to have an expanded state and a contracted state, and includes a support frame and a filter element. The support frame includes multiple first support rods spaced circumferentially along the second tube, with the proximal ends of all first support rods converged and connected to the second tube, and the distal ends of the multiple first support rods converged and connected to the second tube. The filter element is attached to the support frame and covers the proximal portion of the support frame, with the distal end of the filter element at least partially abutting against the wall of the target lumen. The outer tube also covers the protection mechanism, allowing the protection mechanism to switch from the expanded state to the contracted state.

8. The recycling apparatus of claim 7, wherein, The support frame further includes a support ring, the axial projection of which is circular, and the support ring is coaxially arranged with the second tube and connected to multiple first support rods; the filter element covers the portion of the support frame located on the proximal side of the support ring, and the distal end of the filter element is attached to the support ring.

9. The recycling apparatus of claim 1, wherein, The recovery device also includes a guide head connected to the proximal end of the second tube.

Images