Delivery device and vena cava filter system

Abstract

The invention relates to a conveying device and a vena cava filter system, an outer sleeve is provided with an axially-through sleeve inner cavity, an inner core tube is provided with an axially-through core tube inner cavity, the inner core tube is movably arranged in the sleeve inner cavity of the outer sleeve in a penetrating mode, a release wire is movably arranged in the core tube inner cavity of the inner core tube in a penetrating mode, and the far end of the release wire is used for being connected with a filter. An axially-through inner cavity space is arranged in the centering positioning component, the centering positioning component is sleeved outside the inner core tube, the outer sleeve is connected with a first position of the centering positioning component, the inner core tube is connected with a second position of the centering positioning component, and the control device is connected with the outer sleeve and the inner core tube. The radial size of the centering positioning component is changed by controlling the axial relative displacement between the outer sleeve and the inner core tube. The centering positioning of the centering positioning part can ensure that the filter is always kept on the central axis of the blood vessel before being released as much as possible, and the neutral release state and the release state of the filter are ensured.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a delivery device and a vena cava filter system. Background Art

[0002] Venous thromboembolism (VTE) is a common clinical disease with high morbidity and mortality. Venous thromboembolism can include deep venous thrombosis (DVT) and pulmonary embolism (PE). Deep vein thrombosis often occurs in the veins of the lower limbs, while pulmonary embolism is mainly caused by thrombosis in the venous system or right heart that breaks off and enters the pulmonary artery, and is the main cause of disease and death.

[0003] Anticoagulation therapy has always been an important means of treating venous thromboembolism, with the goal of preventing thrombosis, pulmonary embolism, and restoring patency of embolic veins. However, when patients have contraindications to anticoagulation or have bleeding complications and have to stop anticoagulation, a vena cava filter (VCF, Vena Cava Filter) can be implanted in the inferior vena cava to intercept the dislodged deep vein thrombosis and prevent the occurrence of fatal pulmonary embolism.

[0004] At present, the filter commonly used in clinical practice is a retrievable filter. When the risk of pulmonary embolism is eliminated, the filter can be retrieved through a capture device to avoid complications caused by long-term implantation of the filter. However, during the implantation process and the process of retention in the body, the filter is prone to displacement and tilt. Summary of the invention

[0005] Based on this, it is necessary to provide a delivery device and a vena cava filter system to address technical problems such as the filter being easily displaced and tilted.

[0006] The present application provides a conveying device, the conveying device comprising:

[0007] An outer sleeve, wherein the outer sleeve has an axially penetrating sleeve inner cavity;

[0008] An inner core tube, the inner core tube having an axially penetrating core tube inner cavity, and the inner core tube is movably arranged in the sleeve inner cavity of the outer sleeve;

[0009] A release wire, the release wire is movably arranged in the core tube lumen of the inner core tube, and the distal end of the release wire is used to connect to a filter;

[0010] A centering positioning component, wherein the centering positioning component has an axially penetrating inner cavity space, the centering positioning component is sleeved on the outside of the inner core tube, the outer sleeve is connected to the first position of the centering positioning component, and the inner core tube is connected to the second position of the centering positioning component;

[0011] A control device is connected to the outer sleeve and the inner core tube, and changes the radial size of the centering positioning component by controlling the axial relative displacement between the outer sleeve and the inner core tube.

[0012] In one embodiment, the first position is the proximal position of the centering positioning component, the second position is the distal position of the centering positioning component, and the distal end of the inner core tube passes through the inner cavity space and is connected to the second position of the centering positioning component; and / or,

[0013] The first position has a proximal connection portion, the distal end of the outer sleeve is connected to the proximal connection portion of the central positioning component, the second position has a distal connection portion, the distal end of the inner core tube passes through the inner cavity space and is connected to the distal connection portion of the central positioning component; and / or,

[0014] The centering positioning component is a mesh structure sleeved on the outside of the inner core tube, and the mesh structure is symmetrically arranged relative to the axis of the inner core tube, wherein the orthographic projections of the first position and the second position on the axis of the centering positioning component do not overlap.

[0015] In one embodiment, the control device comprises:

[0016] Device body;

[0017] A first control element, movably mounted on the device body, the first control element being connected to the outer sleeve and used for controlling the axial movement of the outer sleeve;

[0018] A second control element, movably mounted on the device body, the second control element is connected to the inner core tube and is used to control the axial movement of the inner core tube;

[0019] A linkage control element, wherein the first control element and the second control element are assembled in linkage with each other through the linkage control element, and is used to control the synchronous axial displacement of the outer sleeve and the inner core tube.

[0020] In one embodiment, one of the first control element and the second control element is fixedly connected to the linkage control element, and the other of the first control element and the second control element can be relatively locked or relatively separated from the linkage control element.

[0021] In one embodiment, the first control element is elastically mounted on the device body and elastically contacts the linkage control element through elastic force, so that the first control element and the linkage control element are relatively locked, or the first control element and the linkage control element are relatively separated by overcoming the elastic force; and / or,

[0022] The second control element is elastically assembled on the device body and elastically contacts the linkage control element through elastic force, so that the second control element and the linkage control element are relatively locked, or the second control element and the linkage control element are relatively separated by overcoming the elastic force.

[0023] In one embodiment, a clamping area is provided on the linkage control element, and the first control element is elastically clamped and locked with the clamping area; and / or,

[0024] The first control element is elastically mounted on the device body through an elastic member; and / or,

[0025] At least a portion of the first control element is made of elastic material.

[0026] In one embodiment, the linkage control element is slidably mounted on the device body; or,

[0027] The linkage control element is fixedly assembled on the inner core tube.

[0028] In one embodiment, the control device further comprises a first release control member and a first center control member, the linkage control member is slidably mounted on the device body, the first release control member is fixedly connected to the linkage control member via the second control member, and the first center control member is fixedly connected to the first control member; or,

[0029] The control device further comprises a second release control member and a second centering control member, the linkage control member is slidably mounted on the device body, the linkage control member is a threaded tube with external threads, the second release control member is threadedly connected to the threaded tube for controlling the threaded tube to move along the axial direction, and the second centering control member is fixedly connected to the first control member; or

[0030] The control device further comprises a third release control member and a third center control member, the linkage control member is fixedly mounted on the inner core tube, the third release control member is fixedly connected to the second control member, and the third center control member is fixedly connected to the first control member; or,

[0031] The control device also includes a fourth release control member, a fourth centering control member, a wire control member and a transmission wire body. The wire control member is control-connected to the transmission wire body. The second control element has a wiring hole. The transmission wire body is connected to the first control element located at the distal end of the second control element through the wiring hole. The linkage control element is fixedly assembled on the inner core tube. The fourth release control member is connected to the second control element for controlling the locking or release of the second control element and the transmission wire body. The fourth centering control member is fixedly connected to the first control element.

[0032] In one embodiment, the delivery device comprises:

[0033] A binding component, wherein the binding component has an axially penetrating binding cavity, the proximal end of the binding component is connected to the distal end of the inner core tube, and the binding cavity is used to bind the filter; and / or,

[0034] A release component is disposed at the distal end of the release wire and is used for connecting a filter.

[0035] The present application provides a vena cava filter system, the vena cava filter system comprising:

[0036] filter;

[0037] The conveying device is used to convey the filter.

[0038] In the above-mentioned delivery device and vena cava filter system, after the filter is delivered to the target position of the blood vessel, the control device can first control the axial relative displacement between the outer sleeve and the inner core tube, and adjust the radial profile size of the centering positioning component so that the centering positioning component can be evenly abutted against the inner wall of the blood vessel in the circumferential direction, and be positioned as centrally as possible on the central axis of the blood vessel. By utilizing the auxiliary adjustment of the centering positioning component, it is possible to ensure that the filter always remains on the central axis of the blood vessel before release.

[0039] After the centering adjustment of the filter is completed, the outer sleeve and the inner core tube can continue to be controlled to be synchronously displaced axially in the proximal direction. The synchronous axial displacement of the two will always maintain the shape of the centering positioning component. During the withdrawal of the outer sleeve and the inner core tube, the centering of the filter will not be affected by the change in the shape of the centering positioning component, so that the filter always remains on the central axis of the blood vessel during the release process, ensuring the centrality of the filter release and a good release shape. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of the structure of a filter provided in one embodiment of the present application.

[0041] Figure 2A schematic structural diagram of a centering positioning component provided for one embodiment of the present application.

[0042] Figure 3 A schematic structural diagram of a centering positioning component provided in another embodiment of the present application.

[0043] Figure 4 A schematic diagram of the structure of a conveying device provided in one embodiment of the present application.

[0044] Figure 5 A schematic diagram of the structure of an outer sheath tube provided in one embodiment of the present application.

[0045] Figure 6 A schematic diagram of the structure of an expander provided in one embodiment of the present application.

[0046] Figure 7 A schematic diagram of the internal structure of a conveying device provided in one embodiment of the present application.

[0047] Figure 8 A schematic diagram of the structure of the control device provided in the first embodiment of the present application.

[0048] Fig. 9 A schematic diagram of the structure of a control device provided in the second embodiment of the present application.

[0049] Fig.10 A schematic diagram of the structure of a control device provided in the third embodiment of the present application.

[0050] Fig.11 A schematic diagram of the structure of a control device provided for the fourth embodiment of the present application.

[0051] Figures 12 to 15 A schematic diagram of the use status of a conveying device provided in one embodiment of the present application.

[0052] Figure Number:

[0053] 100, filter; 200, outer sheath; 300, dilator;

[0054] 110, storage tube; 210, sheath tube connector; 220, sheath tube evacuation member; 230, sheath tube developing member; 310, expansion connector; 320, expansion imaging hole; 330, expansion developing ring;

[0055] 1000, outer sleeve; 2000, inner core tube; 3000, release wire; 4000, centering positioning component; 5000, control device; 6000, restraining component; 7000, releasing component;

[0056] 5100, device body; 5200, first control element; 5300, second control element; 5400, linkage control element; 5400a, clamping area;

[0057] 5500a, first release control member; 5600a, first centering control member; 5500b, second release control member; 5600b, second centering control member; 5500c, third release control member; 5600c, third centering control member; 5500d, fourth release control member; 5600d, fourth centering control member; 5700, line control member; 5800, transmission line. DETAILED DESCRIPTION

[0058] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0059] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0060] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0061] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0062] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0063] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0064] In order to more clearly describe the structure of the delivery device and the vena cava filter system, the term "distal end" is defined here to mean the end away from the operator during the surgical operation, and the term "proximal end" is defined here to mean the end close to the operator during the surgical operation. Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application. The terms used in this application in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0065] The present application provides a vena cava filter system, which includes a filter 100, a delivery device, an outer sheath tube 200, and a dilator 300. The delivery device can cooperate with the outer sheath tube 200 and the dilator 300 to deliver the filter 100 to a predetermined position in a biological body, for example, the filter 100 can be delivered to a target position in a blood vessel to treat pulmonary embolism. Figure 1As shown, the vena cava filter system provided by the present application can be used to deliver an umbrella-shaped filter 100. The umbrella-shaped filter 100 can be composed of a plurality of stent rods. The distal ends of all stent rods are bundled together, and then all stent rods gradually expand and extend radially from the distal end to the proximal end, thereby forming a filter as shown in FIG. Figure 1 In one embodiment, Figure 1 The umbrella-shaped filter 100 shown in the figure has two layers of support rods, and the two layers of support rods can have the effect of layered expansion, that is, the two layers of support rods can be released layer by layer, so as to gradually expand layer by layer to achieve step-by-step release. In addition, those skilled in the art can also construct an umbrella-shaped filter 100 with more than two layers according to needs, so that the umbrella-shaped filter 100 can be divided into more than two layers and gradually expanded, which is not limited here.

[0066] like Figures 2 to 4 As shown, during the conveying process of the filter 100, the conveying device can be centrally positioned by using the central positioning component 4000, which is arranged on the conveying device. The central positioning means that the central positioning component 4000 is evenly pressed against the blood vessel wall in the circumferential direction, so that the entire conveying device is kept on the central axis of the blood vessel as much as possible, ensuring that the filter 100 is kept in the central position of the blood vessel during the release process. The central positioning component 4000 can adopt a structure with a deformation function, so that the central positioning component 4000 can expand and contract, and is in a contracted state during the conveying process. The contracted state makes the central positioning component 4000 present a linear structure, which can enter the blood vessel with the conveying device. During the positioning process, it can be in an expanded state, and the expanded state makes the central positioning component 4000 evenly press against the inner wall of the blood vessel in the circumferential direction. The expansion and contraction of the central positioning component 4000 can cause the size of the central positioning component 4000 to change in the radial direction.

[0067] See also Figure 2 and Figure 3 As shown, the centering positioning component 4000 can be a mesh structure. The mesh structure is symmetrically arranged relative to the axis of the conveying device (such as the inner core tube below). The centering positioning component 4000 can be formed by cutting as shown in FIG. Figure 2 The cutting structure shown in the figure, or the centering positioning component 4000 can also be formed by weaving as shown in the figure. Figure 3 The braided structure shown in the figure. In addition, the centering positioning component 4000 can also adopt a balloon structure. The material can be selected to be a polymer material that is harmless to the organism. Those skilled in the art can select the specific form, material and size of the centering positioning component 4000 according to actual needs, and no limitation is made here. Figures 4 to 6As shown, the filter 100 can be set at the distal end of the inner core tube 2000 and the outer sheath tube 1000 before being released, and can be gathered by the storage tube 110. Before the delivery device delivers the filter 100, the dilator 300 and the outer sheath tube 200 can be used to puncture the biological body to construct a delivery channel suitable for delivering the filter 100. Figure 5 and Figure 6 As shown, the outer sheath 200 can be provided with auxiliary components such as a sheath connector 210, a sheath emptying component 220, and a sheath developing component 230 according to needs. The dilator 300 can also be provided with auxiliary components such as an expansion connector 310, an expansion angiography hole 320, and an expansion developing ring 330. The sheath developing component 230 and the expansion developing ring 330 can be made of tantalum, platinum tungsten, or platinum iridium material.

[0068] A size scale can also be set on the delivery device, and the degree of adjustment of the radial profile size of the centering positioning component 4000 can be monitored in vitro by observing the axial movement position of the outer sleeve 1000 or the inner core tube 2000. The outer sheath 200 and the dilator 300 have good flexibility and rigidity. The material of the outer sheath 200 can be HDPE, PA, Pebax, PI and other polymer materials, and the material of the dilator 300 can be HDPE, PA, Pebax and other polymer materials. Those skilled in the art can choose to set the appropriate auxiliary components to assist the accurate and safe delivery of the filter 100 according to actual needs, which is not limited here.

[0069] Before constructing the delivery channel, the dilator 300 can be inserted into the sheath tube lumen of the outer sheath tube 200, and the distal end of the dilator 300 has a spike end suitable for puncturing the organism. The dilator 300 can use the guide wire as a guide to penetrate the target blood vessel of the organism with the outer sheath tube 200. After reaching the target position, the guide wire and the dilator 300 are withdrawn from the organism, and the outer sheath tube 200 is left in the target blood vessel. At this time, the sheath tube lumen of the outer sheath tube 200 can be used as a delivery channel for conveying the filter 100. The storage tube 110 is connected to the proximal end of the outer sheath tube 200, and the inner core tube 2000 and the outer sleeve 1000 are controlled to advance toward the distal direction relative to the axial direction of the outer sheath tube 200, so that the filter 100 can be conveyed to the distal target position along the sheath tube lumen of the outer sheath tube 200. When the filter 100 reaches the target position in the blood vessel, the filter 100 can be released by the conveying device, and the filter 100 is left in the target position of the blood vessel.

[0070] Continue reading Figure 7As shown, the conveying device specifically includes an outer sleeve 1000, an inner core tube 2000, a release wire 3000, a centering positioning component 4000 and a control device 5000. The outer sleeve 1000 has an axially connected sleeve lumen, the inner core tube 2000 has an axially connected core tube lumen, the inner core tube 2000 is movably arranged in the sleeve lumen of the outer sleeve 1000, the release wire 3000 is movably arranged in the core tube lumen of the inner core tube 2000, and the filter 100 can be connected to the distal end of the release wire 3000 when it is gathered in the storage tube 110. The interior of the centering positioning component 4000 has an axially connected inner cavity space, the centering positioning component 4000 is sleeved on the outside of the inner core tube 2000, the outer sleeve 1000 is connected to the first position of the centering positioning component 4000, and the inner core tube 2000 is connected to the second position of the centering positioning component 4000. The first position and the second position are different positions on the axial direction of the centering positioning component 4000. That is, the projections of the first position and the second position on the axis of the centering positioning component do not overlap.

[0071] Continue reading Figure 2 and Figure 3 As shown, the center positioning component 4000 can be formed by cutting as shown in Figure 2 The cutting structure shown in the figure, or the centering positioning component 4000 can also be formed by weaving as shown in the figure. Figure 3 The braided structure shown. These two similar forms can make the center positioning component 4000 change its size in the radial direction when expanding and contracting.

[0072] Since the centering positioning component 4000 has an expanded state and a contracted state, the axial relative displacement between the inner core tube 2000 and the outer sleeve 1000 can drive the first position and the second position of the centering positioning component 4000 to move relative to each other. When the relative distance between the first position and the second position of the centering positioning component 4000 changes, the shape of the centering positioning component 4000 can change, thereby switching between the expanded state and the contracted state. Figure 7 As shown, when the outer sleeve 1000 moves axially toward the distal end relative to the inner core tube 2000, the distance between the first position and the second position in the center positioning component 4000 becomes smaller, and the distance between the two positions is reduced, which can form an axial compression on the center positioning component 4000, so that the radial profile of the center positioning component 4000 becomes larger, and the center positioning component 4000 gradually changes to an expanded state. When the outer sleeve 1000 moves axially toward the proximal end relative to the inner core tube 2000, the distance between the first position and the second position in the center positioning component 4000 becomes larger, and the distance between the two positions is enlarged, which can form an axial stretch on the center positioning component 4000, so that the radial profile of the center positioning component 4000 becomes smaller, and the center positioning component 4000 gradually changes to a contracted state.

[0073] The first position can be defined as the proximal position of the centering positioning component 4000, and the second position can be defined as the distal position of the centering positioning component 4000. At this time, the distal end of the inner core tube 2000 can pass through the inner cavity space to connect with the second position of the centering positioning component 4000. After the axial relative position between the inner core tube 2000 and the outer sleeve 1000 changes, the distal position and the proximal position of the centering positioning component 4000 can be pulled. In addition, those skilled in the art can also define the first position and the second position as the other two positions of the centering positioning component 4000 according to needs, as long as it can be ensured that the pulling of the centering positioning component 4000 can cause the centering positioning component 4000 to switch between the expansion state and the contraction state, which is not limited here. Moreover, a proximal connecting portion can be set at the first position, and the distal end of the outer sleeve 1000 can be connected to the proximal connecting portion of the central positioning component 4000, and then connected to the first position of the central positioning component 4000; a distal connecting portion can be set at the second position, and the distal end of the inner core tube 2000 can pass through the inner cavity space and be connected to the distal connecting portion of the central positioning component 4000, and then connected to the second position of the central positioning component 4000.

[0074] During the process of adjusting the shape of the centering positioning component 4000, the relative axial displacement between the inner core tube 2000 and the outer sleeve 1000 can be actively controlled by the control device 5000, which is connected to the outer sleeve 1000 and the inner core tube 2000, and its control content can be used to achieve the axial relative displacement between the outer sleeve 1000 and the inner core tube 2000, and / or, its control content can be used to achieve the axial synchronous displacement between the outer sleeve 1000 and the inner core tube 2000. The axial relative displacement of the outer sleeve 1000 and the inner core tube 2000 can realize the conversion of the centering positioning component 4000 between the expansion state and the contraction state, and is used to adjust the radial profile size of the centering positioning component 4000 to adapt to different blood vessel diameters, so that the centering positioning component 4000 can be against the inner wall of the blood vessel with a suitable radial profile size, forming a centering position relative to the filter 100.

[0075] When the radial profile of the centering positioning component 4000 is adjusted, the control device 5000 can control the outer sleeve 1000 and the inner core tube 2000 to move synchronously in the axial direction, and the synchronous axial displacement of the two includes the synchronous axial displacement toward the distal end and the synchronous axial displacement toward the proximal end. During the synchronous axial displacement of the two, the centering positioning component 4000 will always remain in the adjusted shape and will not change its shape. This shape maintenance can make the centering positioning component 4000 always in the center position of the blood vessel. Therefore, during the process of releasing the filter 100, the filter 100 can always be kept in the center position state in the blood vessel. In the process of the outer sleeve 1000 and the inner core tube 2000 being synchronously withdrawn toward the proximal end, the release wire 3000 can be gradually exposed from the distal end relative to the outer sleeve 1000 and the inner core tube 2000. At this time, the release wire 3000 can keep the filter 100 at the target position reached, and as the outer sleeve 1000 and the inner core tube 2000 are gradually withdrawn, the filter 100 is gradually released and gradually unfolds layer by layer.

[0076] It can be seen that after the filter 100 is delivered to the target position of the blood vessel, the control device 5000 can first control the axial relative displacement between the outer sleeve 1000 and the inner core tube 2000, and adjust the radial profile size of the centering positioning component 4000 by adjusting the relative distance between the first position and the second position of the centering positioning component 4000, so that the centering positioning component 4000 can be evenly abutted against the inner wall of the blood vessel in the circumferential direction, and itself is centered on the central axis of the blood vessel, thereby ensuring that the filter 100 can always remain on the central axis of the blood vessel before being released. After the centering adjustment of the filter 100 is completed, the control device 5000 can continue to control the outer sleeve 1000 and the inner core tube 2000 to synchronously displace axially toward the proximal direction. The synchronous axial displacement of the two will always maintain the shape of the centering positioning component 4000. Therefore, during the withdrawal of the outer sleeve 1000 and the inner core tube 2000, the centering of the filter 100 will not be affected by the change in the shape of the centering positioning component 4000, so that the filter 100 is always kept on the central axis of the blood vessel during the release process, ensuring the centering of the filter 100 and the good release shape. The centering positioning component 4000 can adapt to different blood vessel diameters through adjustable radial profile dimensions, expand the scope of use, and meet the needs of different clinical patients.

[0077] The control device 5000 can realize the axial relative displacement and axial synchronous displacement of the outer sleeve 1000 and the inner core tube 2000 in various ways, for example, Figure 7As shown, in one embodiment, the control device 5000 may include a device body 5100, a first control element 5200, a second control element 5300 and a linkage control element 5400. The device body 5100 may be a basic structure suitable for assembling the first control element 5200, the second control element 5300 and the linkage control element 5400, etc., such as a cylinder, a seat, etc., which is not limited here. For example, when the device body 5100 is a cylinder, the first control element 5200 and the second control element 5300 are movably assembled on the device body 5100, which is equivalent to being assembled in the inner cavity of the cylinder. Among them, the first control element 5200 is connected to the outer sleeve 1000 to control the axial movement of the outer sleeve 1000, and the second control element 5300 is connected to the inner core tube 2000 to control the axial movement of the inner core tube 2000. Moreover, the first control element 5200 and the second control element 5300 can be assembled in linkage via the linkage control element 5400. The linkage control of the first control element 5200 and the second control element 5300 by the linkage control element 5400 can be used to control the axial synchronous displacement of the outer sleeve 1000 and the inner core tube 2000.

[0078] One of the first control element 5200 and the second control element 5300 is connected to the linkage control element 5400 , and the other of the first control element 5200 and the second control element 5300 can be relatively locked with or relatively separated from the linkage control element 5400 .

[0079] For example, the first control element 5200 is connected to the linkage control element 5400, and the second control element 5300 is relatively locked or relatively separated from the linkage control element 5400. In the process of adjusting the shape of the centering positioning component 4000, the first control element 5200 and the linkage control element 5400 can be kept relatively fixed, the second control element 5300 and the linkage control element 5400 can be controlled to be relatively separated, and the inner core tube 2000 is driven by the second control element 5300 to axially displace relative to the outer sleeve 1000. After the shape of the centering positioning component 4000 is adjusted, the second control element 5300 and the linkage control element 5400 are controlled to be relatively locked to ensure that the inner core tube 2000 and the outer sleeve 1000 can be axially displaced synchronously.

[0080] Alternatively, the first control element 5200 is relatively locked or relatively separated from the linkage control element 5400, and the second control element 5300 is connected to the linkage control element 5400. In the process of adjusting the shape of the centering positioning component 4000, the second control element 5300 and the linkage control element 5400 can be kept relatively fixed, the first control element 5200 and the linkage control element 5400 are controlled to be relatively separated, and the outer sleeve 1000 is driven by the first control element 5200 to axially displace relative to the inner core tube 2000. After the shape of the centering positioning component 4000 is adjusted, the first control element 5200 and the linkage control element 5400 are controlled to be relatively locked to ensure that the inner core tube 2000 and the outer sleeve 1000 can be axially synchronously displaced. Those skilled in the art can set an adaptive linkage control method according to actual needs, which is not limited here.

[0081] The first control element 5200 and the linkage control element 5400 can be relatively locked or relatively separated in a variety of ways. In one embodiment, the first control element 5200 can be elastically assembled on the device body 5100 through elastic elements such as springs and shrapnel. The elastic assembly of the first control element 5200 can make the first control element 5200 elastically contact with the linkage control element 5400 through elastic force. When the first control element 5200 and the linkage control element 5400 are elastically in contact, the first control element 5200 and the linkage control element 5400 can be relatively locked through the force contact between the two. Alternatively, when the first control element 5200 is subjected to external force, the elastic force is overcome by the external force, so that the first control element 5200 can be released from the force contact with the linkage control element 5400, thereby achieving relative separation between the two. When the second control element 5300 is set to be relatively locked or relatively separated from the linkage control element 5400, the second control element 5300 can also adopt the same elastic assembly method. In addition, the first control element 5200 or the second control element 5300 may also be relatively locked or relatively separated from the linkage control element 5400 by other methods such as clamping, magnetic attraction, etc. Those skilled in the art may set it according to actual needs and it is not limited here.

[0082] like Figure 8As shown, the linkage control element 5400 may be provided with a clamping area 5400a, and the clamping area 5400a has a roughening structure, a clamping groove structure and other structures, so that when the first control element 5200 or the second control element 5300 is elastically clamped with the clamping area 5400a, the locking firmness between the first control element 5200 or the second control element 5300 and the linkage control element 5400 can be improved. The clamping area 5400a can be arranged linearly along the axial direction, so that the clamping area 5400a can cover the axial stroke of the first control element 5200 or the second control element 5300, and the first control element 5200 and the second control element 5300 can be locked with the clamping area 5400a at any time during the axial stroke.

[0083] The linkage method between the first control element 5200 or the second control element 5300 and the linkage control element 5400 can adopt various mechanical transmission methods such as thread transmission, wire transmission, chain transmission, gear transmission and screw transmission. Those skilled in the art can set it according to actual needs and it is not limited here.

[0084] In one embodiment, the linkage control element 5400 can be slidably assembled on the device body 5100 along the axial direction. For example, a track for limiting the axial movement of the linkage control element 5400 is provided on the device body 5100, and the linkage control element 5400 is assembled on the track of the device body 5100. When the device body 5100 adopts a cylinder, the first control element 5200, the second control element 5300 and the linkage control element 5400 can all be assembled in the inner cavity of the cylinder.

[0085] See also Figure 8 As shown, the control device 5000 also includes a first release control member 5500a and a first centering control member 5600a. The first release control member 5500a and the first centering control member 5600a are arranged on the outside of the device body 5100 to facilitate direct manual operation by the operator. The first release control member 5500a and the first centering control member 5600a can be connected to other components inside the device body 5100 through corresponding assembly holes on the device body 5100.

[0086] Among them, the first release control component 5500a is fixedly connected to the linkage control component 5400 through the second control component 5300, and the operator can control the movement of the second control component 5300 and the linkage control component 5400 through the first release control component 5500a. The first centering control component 5600a is fixedly connected to the first control component 5200, and the operator can control the movement of the first control component 5200 through the first centering control component 5600a.

[0087] For example, the first release control member 5500a is fixedly connected to the linkage control member 5400 through the second control member 5300, and the operator can control the movement of the second control member 5300 and the linkage control member 5400 through the first release control member 5500a, so that the second control member 5300 and the linkage control member 5400 are relatively locked or relatively separated. In the process of adjusting the shape of the centering positioning member 4000, the first control member 5200 and the linkage control member 5400 can be kept relatively fixed, the second control member 5300 and the linkage control member 5400 can be controlled to be relatively separated, and the inner core tube 2000 can be driven to axially move relative to the outer sleeve 1000 through the second control member 5300. After the shape of the centering positioning member 4000 is adjusted, the second control member 5300 and the linkage control member 5400 are controlled to be relatively locked, so as to ensure that the inner core tube 2000 and the outer sleeve 1000 can be axially synchronously displaced.

[0088] The linkage control element 5400 may be in a plate-like or strip-like structure. For example, the linkage control element 5400 includes a card plate and a card slot, wherein the card plate may be used to card the first release control element 5500a, so that the first release control element 5500a is fixedly connected to the second control element 5300 and the linkage control element 5400. The card slot may be used to form a card area 5400a, so that the first control element 5200 may be carded and locked with the linkage control element 5400 through the card slot.

[0089] During the adjustment of the shape of the centering positioning component 4000, the operator can apply a force to the first centering control member 5600a, so that the first centering control member 5600a overcomes the elastic force of the first control element 5200 elastically assembled on the device body 5100, and releases the first control element 5200 from the clamping area 5400a of the linkage control element 5400, and then continues to axially move the outer sleeve 1000 through the first centering control member 5600a to adjust the radial profile size of the centering positioning component 4000. After the adjustment is completed, the operator releases the first centering control member 5600a, and the first control element 5200 can continue to be clamped and locked with the clamping area 5400a of the linkage control element 5400 based on its elastic assembly on the device body 5100. At this time, the operator drives the inner core tube 2000 to retreat toward the proximal direction through the first release control member 5500a, and uses the release wire 3000 to push out the filter 100 at the distal end and release it at the target position. During this process, the inner core tube 2000 can drive the outer sleeve 1000 to retreat synchronously through the linkage control element 5400, and the shape of the center positioning component 4000 is always kept unchanged during the release process of the filter 100, so as to achieve the effect of stably releasing the filter 100.

[0090] Continue reading Fig. 9As shown, in one embodiment, the control device 5000 further includes a second release control member 5500b and a second centering control member 5600b, the linkage control element 5400 is slidably assembled on the device body 5100 along the axial direction, the second release control member 5500b and the second centering control member 5600b are arranged outside the device body 5100, so as to facilitate the operator to directly manually control, and the second release control member 5500b and the second centering control member 5600b can be connected with other elements inside the device body 5100 through corresponding assembly holes on the device body 5100. Among them, the linkage control element 5400 can be a threaded tube with external threads, and the second release control member 5500b can also be constructed as a ring or a cylinder with internal threads, which is threadedly connected with the threaded tube by screwing, and the threaded tube is controlled to move helically along the axial direction by rotating the threads, and the second centering control member 5600b is fixedly connected with the first control element 5200, and the operator can control the movement of the first control element 5200 through the second centering control member 5600b.

[0091] Combination Figure 8 As shown, during the adjustment of the shape of the centering positioning component 4000, the operator can apply a force to the second centering control component 5600b so that the second centering control component 5600b overcomes the elastic force of the elastic assembly of the first control element 5200 on the device body 5100, and releases the first control element 5200 from the clamping area 5400a of the linkage control element 5400, and then continues to axially move the outer sleeve 1000 through the first centering control component 5600a to adjust the radial profile size of the centering positioning component 4000. After the adjustment is completed, the operator releases the first centering control component 5600a, and the first control element 5200 can continue to be clamped and locked with the clamping area 5400a of the linkage control element 5400 based on its elastic assembly on the device body 5100. At this time, the operator rotates the second release control member 5500b, so that the second release control member 5500b drives the inner core tube 2000 to retreat toward the proximal direction through the thread transmission, and uses the release thread 3000 to push out the filter 100 at the distal end and release it at the target position. In this process, the inner core tube 2000 can drive the outer sleeve 1000 to retreat synchronously through the linkage control element 5400, and the shape of the center positioning component 4000 is always kept unchanged during the release process of the filter 100, so as to achieve the effect of stable release of the filter 100.

[0092] The linkage control element 5400 is fixedly mounted on the inner core tube 2000. When the device body 5100 is a cylinder, the first control element 5200, the second control element 5300 and the linkage control element 5400 can all be mounted in the inner cavity of the cylinder. Fig.10As shown, in one embodiment, the control device 5000 further includes a third release control member 5500c and a third centering control member 5600c, which are arranged outside the device body 5100 to facilitate direct manual manipulation by the operator, and the third release control member 5500c and the third centering control member 5600c can be connected to other components inside the device body 5100 through corresponding assembly holes on the device body 5100. The third release control member 5500c is fixedly connected to the second control element 5300, and the operator can control the movement of the second control element 5300 through the third release control member 5500c, and the third centering control member 5600c is fixedly connected to the first control element 5200, and the operator can control the movement of the first control element 5200 through the third centering control member 5600c.

[0093] The linkage control element 5400 can adopt a structure such as a slot or sawtooth fixed on the inner core tube 2000, or directly construct a slot or sawtooth structure on the inner core tube 2000, which is not limited here. During the adjustment process of the shape of the centering and positioning component 4000, the operator can apply a force to the third centering control element 5600c, so that the third centering control element 5600c overcomes the elastic force of the elastic assembly of the first control element 5200 on the device body 5100, and releases the first control element 5200 from the linkage control element 5400, and then continues to axially move the outer sleeve 1000 through the third centering control element 5600c to adjust the radial profile size of the centering and positioning component 4000. After the adjustment is completed, the operator releases the third centering control element 5600c, and the first control element 5200 can continue to be locked with the linkage control element 5400 based on its elastic assembly on the device body 5100. At this time, the operator drives the inner core tube 2000 to withdraw toward the proximal direction through the third release control member 5500c, and uses the release wire 3000 to push out the filter 100 at the distal end and release it at the target position. In this process, the linkage control element 5400 moves with the inner core tube 2000, and can drive the outer sleeve 1000 to withdraw synchronously, and the shape of the center positioning member 4000 is always kept unchanged during the release process of the filter 100, so as to achieve the effect of stable release of the filter 100.

[0094] See also Fig.11As shown, the control device 5000 may also include a fourth release control member 5500d, a fourth centering control member 5600d, a line control member 5700 and a transmission line body 5800, wherein the assembly of the fourth release control member 5500d and the fourth centering control member 5600d may refer to the third release control member 5500c and the third centering control member 5600c, and will not be described in detail herein. The line control member 5700 may be connected to the transmission line body 5800 by control, for example, by winding the transmission line body 5800, the second control element 5300 is located at the proximal direction of the first control element 5200, and the line control member 5700 is located at the proximal direction of the second control element 5300, therefore, the second control element 5300 may be provided with a wiring hole, and the transmission line body 5800 is connected to the first control element 5200 located at the distal direction of the second control element 5300 through the wiring hole. The linkage control element 5400 is fixedly assembled on the inner core tube 2000. The linkage control element 5400 can adopt a structure such as a slot, a sawtooth, etc. fixed on the inner core tube 2000, or directly construct a slot, a sawtooth, etc. structure on the inner core tube 2000, which is not limited here. The fourth release control member 5500d is connected to the second control member 5300. The operator can control the locking or release of the second control member 5300 and the transmission line body 5800 through the fourth release control member 5500d. The locking or releasing method can be clamping, magnetic attraction, clamping, etc., which is not limited again. The fourth centering control member 5600d is fixedly connected to the first control member 5200. The operator can control the movement of the first control member 5200 through the fourth centering control member 5600d.

[0095] During the adjustment of the shape of the centering positioning component 4000, the operator can apply a force to the fourth centering control component 5600d, so that the fourth centering control component 5600d overcomes the elastic force of the first control component 5200 elastically assembled on the device body 5100, and releases the first control component 5200 from the linkage control component 5400, and then continues to axially move the outer sleeve 1000 through the fourth centering control component 5600d to adjust the radial profile size of the centering positioning component 4000. After the adjustment is completed, the operator releases the fourth centering control component 5600d, and the first control component 5200 can continue to be locked with the linkage control component 5400 based on its elastic assembly on the device body 5100. At this time, the operator drives the inner core tube 2000 to retreat toward the proximal direction through the fourth release control component 5500d, and uses the release wire 3000 to push out the filter 100 at the distal end and release it at the target position. During this process, the linkage control element 5400 moves with the inner core tube 2000 and can drive the outer sleeve 1000 to retreat synchronously through the transmission line 5800. During the release process of the filter 100, the shape of the center positioning component 4000 is always kept unchanged, thereby achieving the effect of stably releasing the filter 100.

[0096] See also Figures 12 to 15 As shown, in one embodiment, the delivery device includes a binding component 6000 and a releasing component 7000. The binding component 6000 has an axially through binding cavity. The proximal end of the binding component 6000 is connected to the distal end of the inner core tube 2000. The binding cavity is used to bind the filter 100. The releasing component 7000 is arranged at the distal end of the release wire 3000. The releasing component 7000 is used to connect with the filter 100. The proximal end of the release wire 3000 can be connected to the control device 5000, and the distal end of the release wire 3000 can be connected to the releasing component 7000. The filter 100 is hung on the releasing component 7000, and the inner core tube 2000 is connected to the binding component 6000.

[0097] During the process of releasing the filter 100, the control device 5000 can keep the release wire 3000 immobile, and the release component 7000 is stable and immobile. The operator controls the inner core tube 2000 and the outer sleeve 1000 to withdraw synchronously, and the radial profile size of the centering positioning component 4000 remains unchanged. The release wire 3000 has a certain hardness. As the inner core tube 2000 and the outer sleeve 1000 withdraw, the release wire 3000 can be sufficient to maintain the support state in the inner core tube, and then the filter 100 is pushed out from the far end relative to the inner core tube 2000 and the outer sleeve 1000 through the release component 7000, so that the filter is untied and released at the target position. Among them, if the filter 100 is a multi-layer stent rod structure, the multi-layer stent rod can be released layer by layer from the restraining cavity of the restraining component 6000 to achieve the step-by-step opening of the filter 100. The step-by-step deployment of the filter 100 can prevent the filter 100 from jumping forward during release, prevent different stent rods from getting entangled, and achieve accurate positioning and release of the filter 100, as well as a good shape in the blood vessel. A good release shape of the filter 100 and the step-by-step release function can ensure that the stent rods of the filter 100 are evenly distributed on the blood vessel wall in the circumferential direction, avoid serious blood vessel coating due to uneven distribution of the stent rods of the filter 100, and benefit the success rate of thrombus interception and recovery of the filter 100.

[0098] The inner core tube 2000 and the outer sleeve 1000 may be made of polymer materials or metal materials. The inner core tube 2000 and the outer sleeve 1000 may have good flexibility at the distal end near the filter 100 and the centering positioning component 4000, which can make the filter 100 gradually center in the blood vessel as the centering positioning component 4000 expands. The end of the release component 7000 needs to be smooth to ensure good passability in the outer sheath tube 200 and the binding cavity.

[0099] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0100] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A conveying device, It is characterized in that The conveying device comprises: An outer sleeve, wherein the outer sleeve has an axially penetrating sleeve inner cavity; An inner core tube, the inner core tube having an axially penetrating core tube inner cavity, and the inner core tube is movably arranged in the sleeve inner cavity of the outer sleeve; A release wire, the release wire is movably arranged in the core tube lumen of the inner core tube, and the distal end of the release wire is used to connect to a filter; A centering positioning component, wherein the centering positioning component has an axially penetrating inner cavity space, the centering positioning component is sleeved on the outside of the inner core tube, the outer sleeve is connected to the first position of the centering positioning component, and the inner core tube is connected to the second position of the centering positioning component; A control device is connected to the outer sleeve and the inner core tube, and changes the radial size of the centering positioning component by controlling the axial relative displacement between the outer sleeve and the inner core tube.

2. The conveying device according to claim 1, It is characterized in that The first position is the proximal position of the centering positioning component, the second position is the distal position of the centering positioning component, and the distal end of the inner core tube passes through the inner cavity space and is connected to the second position of the centering positioning component; and / or, The first position has a proximal connection portion, the distal end of the outer sleeve is connected to the proximal connection portion of the central positioning component, the second position has a distal connection portion, the distal end of the inner core tube passes through the inner cavity space and is connected to the distal connection portion of the central positioning component; and / or, The centering positioning component is a mesh structure sleeved on the outside of the inner core tube, and the mesh structure is symmetrically arranged relative to the axis of the inner core tube, wherein the orthographic projections of the first position and the second position on the axis of the centering positioning component do not overlap.

3. The conveying device according to claim 1, It is characterized in that The control device comprises: Device body; A first control element, movably mounted on the device body, the first control element being connected to the outer sleeve and used for controlling the axial movement of the outer sleeve; A second control element, movably mounted on the device body, the second control element is connected to the inner core tube and is used to control the axial movement of the inner core tube; A linkage control element, wherein the first control element and the second control element are assembled in linkage with each other through the linkage control element, and is used to control the synchronous axial displacement of the outer sleeve and the inner core tube.

4. The conveying device according to claim 3, It is characterized in that One of the first control element and the second control element is fixedly connected to the linkage control element, and the other of the first control element and the second control element can be relatively locked with or relatively separated from the linkage control element.

5. The conveying device according to claim 4, It is characterized in that The first control element is elastically assembled on the device body and elastically contacts the linkage control element through elastic force, so that the first control element and the linkage control element are relatively locked, or the first control element and the linkage control element are relatively separated by overcoming the elastic force.

6. The conveying device according to claim 5, It is characterized in that The linkage control element is provided with a clamping area, and the first control element is elastically clamped and locked with the clamping area; and / or, The first control element is elastically mounted on the device body through an elastic member; and / or, At least a portion of the first control element is made of elastic material.

7. The conveying device according to claim 6, It is characterized in that The linkage control element is slidably mounted on the device body; or, The linkage control element is fixedly assembled on the inner core tube.

8. The conveying device according to claim 5, It is characterized in that The control device further comprises a first release control member and a first center control member, the linkage control member is slidably mounted on the device body, the first release control member is fixedly connected to the linkage control member via the second control member, and the first center control member is fixedly connected to the first control member; or The control device further comprises a second release control member and a second centering control member, the linkage control member is slidably mounted on the device body, the linkage control member is a threaded tube with external threads, the second release control member is threadedly connected to the threaded tube for controlling the threaded tube to move along the axial direction, and the second centering control member is fixedly connected to the first control member; or The control device further comprises a third release control member and a third center control member, the linkage control member is fixedly mounted on the inner core tube, the third release control member is fixedly connected to the second control member, and the third center control member is fixedly connected to the first control member; or, The control device also includes a fourth release control member, a fourth centering control member, a wire control member and a transmission wire body. The wire control member is control-connected to the transmission wire body. The second control element has a wiring hole. The transmission wire body is connected to the first control element located at the distal end of the second control element through the wiring hole. The linkage control element is fixedly assembled on the inner core tube. The fourth release control member is connected to the second control element for controlling the locking or release of the second control element and the transmission wire body. The fourth centering control member is fixedly connected to the first control element.

9. The conveying device according to claim 1, It is characterized in that The conveying device comprises: A binding component, wherein the binding component has an axially penetrating binding cavity, the proximal end of the binding component is connected to the distal end of the inner core tube, and the binding cavity is used to bind the filter; and / or, A release component is disposed at the distal end of the release wire and is used for connecting a filter.

10. A vena cava filter system, It is characterized in that The vena cava filter system comprises: filter; The conveying device according to any one of claims 1 to 9, used for conveying the filter.

Images