A medical device

Abstract

The present invention provides a medical device, the medical device comprising: a conveyor and the implant; the conveyor comprises a conveying device and an auxiliary device, the auxiliary device is connected to the conveying device and is configured to be able to expand or contract along the radial direction of the conveying device; the implant is detachably connected to the conveying device; the medical device is configured such that the conveyor is used to convey and release the implant to a predetermined position in a target cavity, and in the process of releasing the implant, the auxiliary device radially expands and releases the implant at the predetermined position in a predetermined posture. The advantage of the medical device is that the implant is positioned in the target cavity in an expected posture, the efficiency of thrombus interception is improved, and subsequent recovery is facilitated.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical instruments, and in particular relates to a medical device. Background Art

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

[0003] Anticoagulation therapy has always been the gold standard for VTE treatment, with the purpose of preventing thrombosis, preventing PE, and restoring the patency of thrombosed veins. When a patient has contraindications to anticoagulation or has blood complications and has to stop anticoagulation, a vena cava filter (VCF) can be implanted in the inferior vena cava to intercept the detached thrombus and prevent the occurrence of fatal PE. The filter in the prior art is prone to tilt when implanted in the inferior vena cava, and cannot achieve the expected thrombus interception effect. In addition, the filter in the prior art is also prone to displacement after implantation in the inferior vena cava, which is not conducive to the subsequent recovery of the filter. Summary of the invention

[0004] The object of the present invention is to provide a treatment device, in which an implant can be released in a target cavity in a predetermined posture, thereby improving the embolism interception effect and improving the therapeutic effect.

[0005] To achieve the above object, the present invention provides a medical device, comprising: a conveyor and an implant; the conveyor comprises a conveying device and an auxiliary device, the auxiliary device is connected to the conveying device and is configured to be able to expand or contract along the radial direction of the conveying device; the implant is detachably connected to the conveying device;

[0006] The medical device is configured as the delivery device for delivering and releasing the implant to a predetermined position in a target cavity, and during the process of releasing the implant, the auxiliary device radially expands and releases the implant at the predetermined position in a predetermined posture.

[0007] Optionally, the delivery device includes a tube assembly and a rear release assembly; the tube assembly includes at least a first tube body; the distal structure of the rear release assembly is partially connected to the first tube body and coaxially arranged with the first tube body; the auxiliary device is sleeved on the first tube body and is located on the proximal side of the distal structure; the implant is detachably connected to the distal structure of the rear release assembly.

[0008] Optionally, the auxiliary device comprises a first transition section, a main section and a second transition section which are axially connected in sequence, and the outer diameters of the first transition section and the second transition section decrease in a direction away from the main section;

[0009] The auxiliary device is configured to be able to move at least partially along the axial direction of the first tube, and to expand or contract the auxiliary device in the radial direction.

[0010] Optionally, the outer diameter of at least some segments of the main body segment is greater than or equal to the maximum outer diameter of the first transition segment and the second transition segment.

[0011] Optionally, the tube assembly further comprises a second tube body, which is sleeved on the outside of the first tube body and can generate axial relative movement with the first tube body and the distal structure;

[0012] The distal end of the auxiliary device and the first tube body remain relatively stationary in the axial direction, and the proximal end of the auxiliary device is connected to the distal end of the second tube body and moves synchronously with the second tube body.

[0013] Optionally, the conveying device further comprises a handle, on which a first driving assembly is disposed, and the first driving assembly is connected to the proximal end of the second tube body and is used to drive the second tube body to perform axial movement relative to the first tube body.

[0014] Optionally, the first transition section and the second transition section are arranged at two axial ends of the main section in a mirror-symmetrical manner; or,

[0015] The length of the first transition segment is shorter than the length of the second transition segment, and the first transition segment is closer to the implant.

[0016] Optionally, the auxiliary device is a balloon, and the first tube body is provided with a perfusion channel, which is connected to the balloon and is used for perfusing a filling agent into the balloon.

[0017] Optionally, the rear release assembly includes a limiting sleeve, a restraining member and a connecting member, wherein the limiting sleeve and the restraining member constitute the distal end structure of the rear release assembly; the limiting sleeve is connected to the first tube body and communicated with the first tube body, and the limiting sleeve and the first tube body remain relatively stationary in the axial direction; the restraining member is used to be arranged in the limiting sleeve; the connecting member is arranged inside the first tube body and can generate axial relative movement with the first tube body, and the distal end of the connecting member is connected to the restraining member;

[0018] The rear release component is configured such that when the restraining member is at least partially located inside the limiting sleeve, the restraining member cooperates with the limiting sleeve and is detachably connected to the implant; when the first tube body moves relative to the connecting member, so that the restraining member is at least partially exposed from the distal end of the limiting sleeve and the restraining member is released from the limiting sleeve, the rear release component is released from the implant.

[0019] Optionally, the conveying device also includes a handle, on which a second drive assembly is provided; the handle is connected to the proximal end of the connecting piece, and the second drive assembly is connected to the proximal end of the first tube body and is used to drive the first tube body to perform axial movement relative to the connecting piece.

[0020] Optionally, the implant comprises a plurality of filter rod groups and a recovery part, the proximal ends of all the filter rod groups are connected to the recovery part, and each filter rod group comprises a plurality of filter rods; the lengths of the filter rods in different filter rod groups are not equal, the lengths of all the filter rods in the same filter rod group are equal, and all the filter rods in the same filter rod group are symmetrically arranged around the axis of the implant;

[0021] The recovery portion is used to be detachably connected to the rear release assembly; or,

[0022] The medical device also includes a sheath, the shortest filter rod is used to be compressed in the sheath, the distal ends of the remaining filter rods are used to extend into the interior of the limiting sleeve, and the longest filter rod distal end is used to cooperate with the restraining member and the limiting sleeve.

[0023] Optionally, the restraining member is a slider, and a groove is provided on the side wall of the slider;

[0024] The medical device is configured such that when the slider is at least partially located within the limiting sleeve, the groove and the inner surface of the limiting sleeve jointly limit the position of the proximal end or the distal end of the implant, so that the implant is connected to the rear release component; when the slider moves axially relative to the limiting sleeve and exposes the groove from the limiting sleeve, the rear release component is disconnected from the implant.

[0025] Optionally, the restraining member is an elastic member; the medical device is configured such that when the elastic member is located in the limiting sleeve, the elastic member is bent to form a hook to hook the implant, and the limiting sleeve applies radial pressure to the elastic member to keep the elastic member in a shape having the hook; when the elastic member at least partially extends out of the limiting sleeve, the limiting sleeve releases the radial pressure applied to the elastic member and restores the elastic member to a shape without the hook, so that the elastic member releases the implant.

[0026] Compared with the prior art, the medical device of the present invention has the following advantages:

[0027] The aforementioned medical device includes a conveyor and an implant, wherein the conveyor includes a conveying device and an auxiliary device, wherein the auxiliary device is connected to the conveying device and is configured to be able to expand or contract radially along the conveying device; the implant is detachably connected to the conveying device; the medical device is configured such that the conveyor is used to convey and release the implant to a predetermined position in a target cavity, and during the process of releasing the implant, the auxiliary device expands radially and releases the implant at the predetermined position in a predetermined posture, so as to avoid the implant deviating from the expected posture and reducing the efficiency of thrombus interception, thereby improving the treatment effect.

[0028] Furthermore, the implant can be released step by step through the rear release assembly to avoid the implant jumping forward during the release process and causing the implant to deviate from the predetermined position. In addition, at least part of the filter rod of the implant is provided with an anchor to penetrate the inner wall of the target cavity, so that the implant remains in the predetermined position. An anti-puncture component is also provided to limit the penetration depth of the anchor on the inner wall of the target cavity, thereby preventing the anchor from piercing the inner wall of the target cavity and causing damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to better understand the present invention and do not constitute an improper limitation of the present invention.

[0030] Figure 1 is a schematic structural diagram of a medical device provided according to an embodiment of the present invention, wherein a filter is not shown;

[0031] Figure 2 is a schematic structural diagram of a conveyor for a medical device provided according to an embodiment of the present invention;

[0032] Figure 3 is a schematic structural diagram of a filter of a medical device provided according to an embodiment of the present invention;

[0033] Figure 4is a schematic diagram of a use scenario of a medical device provided according to an embodiment of the present invention, in which a conveyor conveys a filter to the inferior vena cava via the jugular vein;

[0034] Figure 5 It is a schematic diagram of the connection mode between the rear release component and the filter in the medical device provided according to one embodiment of the present invention;

[0035] Figure 6 is a schematic diagram of a connection method between a rear release component and a filter in a medical device provided according to another embodiment of the present invention;

[0036] Figure 7 is a schematic structural diagram of a dilator used in an embodiment of the present invention;

[0037] Figure 8 is a schematic diagram of the structure of the sheath tube used in an embodiment of the present invention;

[0038] Fig. 9 is a schematic diagram of a use scenario of a medical device provided according to an embodiment of the present invention, in which a conveyor conveys a filter to the inferior vena cava via a femoral vein;

[0039] Fig.10 It is a schematic diagram of the connection between the rear release component and the filter in the medical device provided according to another embodiment of the present invention.

[0040] [Description of reference numerals is as follows]:

[0041] 1000-conveyor;

[0042] 1100- conveying device;

[0043] 1110-tube assembly;

[0044] 1111-the first tube body, 1112-the second tube body;

[0045] 1121-limiting sleeve, 1122-binding piece;

[0046] 1130-handle;

[0047] 1131-chute, 1142-control block;

[0048] 1140-first drive assembly;

[0049] 1141-first slider;

[0050] 1151-knob;

[0051] 1200- auxiliary devices;

[0052] 1210-first transition section, 1220-main section, 1230-second transition section;

[0053] 1300-storage tube;

[0054] 1400-dilator;

[0055] 1410 - angiography hole, 1420 - second developing element;

[0056] 1500-sheath;

[0057] 1510 - first developing element;

[0058] 2000-filter;

[0059] 2100-Recycling Department;

[0060] 2210 - filter rod, 2210a - first filter rod, 2211a - first part, 2212a - second part, 2213a - third part, 2210b - second filter rod, 2210c - third filter rod, 2210d - fourth filter rod, 2310 - first anchor, 2320 - second anchor, 2410 - anti-puncture component. DETAILED DESCRIPTION

[0061] The following is an explanation of the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the present embodiment only illustrate the basic concept of the present invention in a schematic manner, and only the components related to the present invention are shown in the figure instead of being drawn according to the number, shape and size of the components in the actual implementation. The type, quantity and proportion of each component in the actual implementation can be a random change, and the component layout type may also be more complicated.

[0062] In addition, each embodiment of the following description has one or more technical features, but this does not mean that the user of the present invention must implement all the technical features in any embodiment at the same time, or can only implement part or all of the technical features in different embodiments separately. In other words, under the premise that implementation is possible, those skilled in the art can selectively implement part or all of the technical features in any embodiment according to the disclosure of the present invention and according to the design specifications or implementation requirements, or selectively implement a combination of part or all of the technical features in multiple embodiments, thereby increasing the flexibility of the implementation of the present invention.

[0063] As used in this specification, the singular forms "a", "an", and "the" include plural objects, and the plural form "plurality" includes more than two objects, unless the content clearly indicates otherwise. As used in this specification, the term "or" is generally used to include the meaning of "and / or", unless the content clearly indicates otherwise, and the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and it can be a connection between the internal parts of two elements or an interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0064] In order to make the purpose, advantages and features of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings. It should be noted that the drawings are all in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. The same or similar reference numerals in the drawings represent the same or similar components.

[0065] Figure 1 shows a schematic structural diagram of the medical device, Figure 2 A schematic structural diagram of a conveyor 1000 of the medical device is shown. Figure 3 A schematic structural diagram of the filter 2000 of the medical device is shown.

[0066] Please refer to Figures 1 to 3The medical device includes a conveyor 1000 and an implant, and the implant is, for example, a filter 2000. The conveyor 1000 includes a conveyor 1100 and an auxiliary device 1200, and the auxiliary device 1200 is connected to the conveyor 1100 and is configured to be able to expand or contract along the radial direction of the conveyor 1100; the filter 2000 is detachably connected to the conveyor 1100. The medical device is configured such that the conveyor 1000 is used to convey and release the filter 2000 to a predetermined position in a target cavity, and in the process of releasing the filter 2000, the auxiliary device 1200 expands along the radial direction of the conveyor 1100 and releases the filter 2000 at the predetermined position in a predetermined posture. Generally, the filter 2000 can be implanted in the inferior vena cava to intercept thrombi, prevent thrombi from entering the heart and then the pulmonary artery to cause pulmonary embolism. And in actual work, when the filter 2000 is implanted in the inferior vena cava, it is hoped that the filter 2000 can be centrally positioned in the inferior vena cava to improve the embolic capture effect. Here, the meaning of "centrally positioned" refers to the coaxial arrangement of the filter 2000 and the inferior vena cava. In this case, the target cavity can be the inferior vena cava, and the predetermined posture of the filter 2000 can refer to the posture in which the filter 2000 can be coaxial with the inferior vena cava. In the embodiment of the present invention, the auxiliary device 1200 is connected to the conveying device 1100, and the auxiliary device 1200 is used to assist the filter 2000 in releasing the filter 2000 in the predetermined posture (i.e., coaxially) in the process of releasing the filter 2000, thereby improving the interception effect of the filter 2000 on the thrombus and improving the therapeutic effect. It can be understood that after the release of the filter 2000 is completed, the conveying device 1100 is withdrawn from the body together with the auxiliary device 1200.

[0067] For details, please refer to Figure 2In some embodiments, the auxiliary device 1200 is preferably a pipe network structure, and includes a first transition section 1210, a main section 1220, and a second transition section 1230 that are axially connected in sequence, and the outer diameters of the first transition section 1210 and the second transition section 1230 decrease in a direction away from the main section 1220. The auxiliary device 1200, the conveying device 1100, and the filter 2000 are coaxially arranged. When the delivery device 1100 delivers the auxiliary device 1200 and the filter 2000 to a predetermined position in the inferior vena cava, during the process of releasing the filter 2000 (i.e., when the filter 2000 is not completely released), the auxiliary device 1200 is radially expanded, and at least a portion of the outer wall of the main body section 1220 of the auxiliary device 1200 is in contact with the inner wall of the inferior vena cava, and the main body section 1220 is supported on the inner wall of the inferior vena cava, so that the auxiliary device 1200 is coaxially arranged with the inferior vena cava, and the filter 2000 can also be coaxial with the inferior vena cava. In the embodiment of the present invention, the auxiliary device 1200 is preferably a self-expanding structure, which will not block blood flow when it expands in the inferior vena cava and is supported on the vessel wall. Those skilled in the art know that the self-expanding structure refers to a structure made of a material with high elasticity, which deforms when subjected to external pressure, and once the external pressure is removed, it will restore its initial shape under the action of at least high elasticity, and the material of the self-expanding structure can usually be a shape memory material such as nickel-titanium alloy. The auxiliary device 1200 can be formed by weaving wire or cutting a tube.

[0068] In this embodiment, the outer diameter of at least some segments of the main body segment 1220 is greater than or equal to the maximum outer diameter of the first transition segment 1210 and the second transition segment 1230. Preferably, the main body segment 1220 includes a plurality of cylindrical segments and the outer diameter of each cylindrical segment is equal to the maximum outer diameter of the first transition segment 1210 and the second transition segment 1230. The cylindrical segments are used to contact the wall of the inferior vena cava, so that the main body segment 1220 and the inner wall of the blood vessel are in surface contact, with a large contact area and more firm support. The predetermined length is determined according to actual needs. Alternatively, the projection of the contour of the outer wall of the main body segment 1220 on a plane parallel to the axis of the auxiliary device 1200 can also be a curve, as long as the main body segment 1220 can abut against the inner wall of the inferior vena cava after expansion, and the auxiliary device 1200 is arranged coaxially with the inferior vena cava.

[0069] In addition, in some embodiments, the first transition section 1210 and the second transition section 1230 are radially symmetrically arranged at the axial ends of the main section 1220, or in other embodiments, the length of the first transition section 1210 is smaller than the length of the second transition section 1230, and the first transition section 1210 is closer to the filter 2000. Such an arrangement is conducive to keeping the filter 2000 coaxial with the auxiliary device 1200 in the blood vessel.

[0070] Please focus on Figure 3 In an exemplary embodiment, the filter 2000 includes a recovery portion 2100 and a plurality of filter rod groups, and the proximal ends of the plurality of filter rod groups are connected to the recovery portion 2100. Each of the filter rod groups includes a plurality of filter rods 2210. Among them, the lengths of the filter rods 2210 in different filter rod groups are not equal, the lengths of the filter rods 2210 in the same filter rod group are equal, and the filter rods 2210 in the same filter rod group are arranged symmetrically around the axis center of the filter 2000. The specific connection method of the filter 2000 and the conveying device 1100 will be described in conjunction with the usage scenario hereinafter.

[0071] Optionally, the shortest filter rod 2210 is used for linear contact with the blood vessel wall, and the distal ends of the remaining filter rods 2210 are formed with anchors, which are used to penetrate the blood vessel wall so that the remaining filter rods 2210 are in point contact with the blood vessel wall.

[0072] This article takes the filter 2000 including four filter rod groups as an example for introduction, and the four filter rod groups are respectively a first filter rod group, a second filter rod group, a third filter rod group and a fourth filter rod group, the first filter rod group includes six first filter rods 2210a, the second filter rod group includes two second filter rods 2210b, the third filter rod group includes two third filter rods 2210c, and the fourth filter rod group includes two fourth filter rods 2210d, and the length of the first filter rod 2210a, the length of the second filter rod 2210b, the length of the third filter rod 2210c and the length of the fourth filter rod 2210d increase in sequence. In this way, the first filter rod 2210a is used to contact the blood vessel wall line, and the second filter rod 2210b, the third filter rod 2210c and the fourth filter rod 2210d are formed with the anchor. Those skilled in the art can understand that the length of the filter rod 2210 refers to the dimension of the filter rod 2210 in the axial direction of the filter 2000 when the filter rod 2210 is in a compressed state.

[0073] Optionally, the first filter rod 2210a includes a first part 2211a, a second part 2212a and a third part 2213a connected in sequence from the proximal end to the distal end. Wherein, the distance from the first part 2211a to the axis of the filter 2000 gradually increases along the direction from the proximal end to the distal end, the distance from the third part 2213a to the axis of the filter 2000 is greater than the distance from the first part 2211a to the axis of the filter 2000, and the second part 2212a is actually a transition part to avoid forming a sharp angle on the first filter rod 2210a. The second filter rod 2210b, the third filter rod 2210c and the third filter rod 2210d are all linear configurations, and the distance from each filter rod to the axis of the filter 2000 gradually increases along the distance from the proximal end to the distal end.

[0074] Further, the anchor includes a first anchor 2310 and a second anchor 2320, and the first anchor 2310 and the second anchor 2320 are formed on different filter rods 2210. When the anchor pierces the blood vessel wall, the first anchor 2310 is used to prevent the filter 2000 from moving from the proximal end to the distal end, and the second anchor 2320 is used to prevent the filter 2000 from moving from the distal end to the proximal end, so that the filter 2000 is kept in a predetermined position and effectively intercepts thrombus. In this embodiment, the first anchor 2310 can be a linear structure, and the proximal end of the first anchor 2310 is connected to the distal end of the corresponding filter rod 2210, and the distal end of the first anchor 2310 is a free end. The second anchor 2320 is a barb structure, and the free end of the second anchor 2320 is arranged toward the proximal end of the filter 2000.

[0075] Generally, the length of the filter rod 2210 formed with the second anchor 2320 is shorter than the length of the filter rod 2210 formed with the first anchor 2310. That is, in this embodiment, the first anchor 2310 is formed on the fourth filter rod 2210d, the second anchor 2320 is formed on the second filter rod 2210b, and the second anchor 2320 (such as the third filter rod 2210c) can be formed on the third filter rod 2210c. Figure 3 The filter rod 2210 may be provided with a plurality of anchors (not shown in the figure), and the first anchor may also be formed (not shown in the figure). In addition, the filter rod 2210 at least partially provided with the anchor is also provided with an anti-puncture component 2410, and preferably all filter rods 2210 provided with the anchor are provided with the anti-puncture component 2410. The anti-puncture component 2410 is used to prevent the anchor from piercing the blood vessel wall. It can be understood by those skilled in the art that this purpose can be achieved by adjusting the shape and size of the anti-puncture component 2410.

[0076] It should be noted that although this article uses Figure 3 The filter 2000 shown is introduced as an example, but it can be understood that the filter in the prior art can also be combined with the conveyor 1000 to form the medical device.

[0077] Next, the preferred structure of the medical device will be introduced in combination with the usage scenario of the medical device. Hereinafter, the terms "distal end" and "proximal end" are defined according to the position of the filter 2000 relative to the heart after being implanted in the patient's body. The "distal end" refers to the end of the filter 2000 that is farther from the heart, and the "proximal end" refers to the end of the filter 2000 that is closer to the heart. The terms "distal end" and "proximal end" refer to the relative orientation, relative position, and direction of the elements or actions of the conveyor 1000 relative to each other from the perspective of the operator using the medical device. The "distal end" usually refers to the end of the conveyor 1000 that first enters the patient's body, and the "proximal end" usually refers to the end of the conveyor 1000 that is close to the operator during normal operation.

[0078] Figure 4 A schematic diagram is shown in which the distal end of the medical device enters the inferior vena cava through the jugular vein. In the figure, the filter 2000 is located at the distal end of the auxiliary device 1200.

[0079] Please refer to Figure 4 Combined with Figure 2 The delivery device 1100 includes a tube assembly 1110 and a rear release assembly. The tube assembly 1110 includes at least a first tube body 1111, and the distal structure of the rear release assembly is partially connected to the first tube body 1111, preferably connected to the distal end of the first tube body 1111, and the distal structure of the rear release assembly is coaxially arranged with the first tube body 1111. The auxiliary device 1200 is sleeved on the first tube body 1111 and is configured to be able to move at least partially along the axial direction of the first tube body 1111 to expand or contract the auxiliary device 1200. The proximal end of the filter 2000 (specifically the recovery part 2100) is detachably connected to the distal structure of the rear release assembly. By setting up the rear release component, it is not only convenient to adjust the expansion of the auxiliary device 1200 when releasing the filter 2000, but also possible to release the filter 2000 in steps (first release the filter rod, and finally release the connection between the rear release component and the recovery part 2100), thereby avoiding the forward jump phenomenon that causes the filter 2000 to deviate from the predetermined position when releasing the filter 2000 at one time.

[0080] Furthermore, the tube assembly 1110 further includes a second tube body 1112, which is sleeved on the outside of the first tube body 1111 and can generate axial relative movement with the first tube body 1111. The distal end of the auxiliary device 1200 and the first tube body 1111 remain relatively stationary in the axial direction, and the proximal end of the auxiliary device 1200 is connected to the distal end of the second tube body 1112 and moves synchronously with the second tube body 1112 to generate axial relative movement with the first tube body 1111, so that the auxiliary device 1200 expands or contracts radially.

[0081] Furthermore, the rear release assembly may include a limiting sleeve 1121, a restraining member 1122 and a connecting member (not shown in the figure), wherein the limiting sleeve 1121 and the restraining member 1122 together constitute the distal structure. The limiting sleeve 1121 may be a cylindrical hollow tube, which is connected to the first tube body 1111 (specifically connected to the distal end of the first tube body 1111), and remains relatively stationary with the first tube body 1111 in the axial direction, and the limiting sleeve 1121 is also connected to the first tube body 1111. The restraining member 1122 is used to be arranged inside the limiting sleeve 1121, and can generate axial relative movement with the limiting sleeve 1121. The connecting member is inserted into the first tube body 1111 and can generate axial relative movement with the first tube body 1111, and the distal end of the connecting member is connected to the restraining member 1122. The rear release assembly is configured such that when the restraining member 1122 is at least partially located inside the limiting sleeve 1121, the restraining member 1122 cooperates with the limiting sleeve 1121 and is connected to the recovery portion 2100 of the filter 2000. When the restraining member 1122 moves relative to the limiting sleeve 1121 and at least partially extends from the distal end of the limiting sleeve 1121 and releases the mutual cooperation with the limiting sleeve 1121, the rear release assembly is disconnected from the recovery portion 2100.

[0082] In an alternative implementation, see Figure 5, the recovery part 2100 is a recovery hook. The restraining member 1122 is an elastic member, such as a self-expanding structural member. The medical device is configured such that when the restraining member 1122 is located inside the limiting sleeve 1121, the restraining member 1122 is bent to form a hook and hooks the recovery hook, and the limiting sleeve 1121 applies radial pressure to the restraining member 1122 so that the restraining member 1122 remains in a form with the hook, so that the rear release assembly remains connected to the filter 2000. When the restraining member 1122 at least partially extends out of the limiting sleeve 1121, and the limiting sleeve 1121 releases the radial pressure applied to the restraining member 1122 so that the restraining member 1122 is restored to a form without the hook, the rear release assembly releases the filter 2000, so that the two are disconnected. The self-expanding structural member mentioned here refers to a structural member that has good resilience and can deform when subjected to pressure. Once the pressure is removed, the structural member returns to its original shape under the action of its own resilience. Usually, the self-expanding structural member is made of shape memory alloys such as nickel-titanium alloy.

[0083] Or, in another optional implementation, such as Figure 6 As shown, the recovery part 2100 can be a recovery hook, and a connection hole is provided on the recovery hook. The restraining member 1122 is an elastic member such as a self-expanding structural member. When the restraining member 1122 is located inside the limiting sleeve 1121, the hook formed by the bending of the restraining member 1122 partially extends into the connection hole to hook the recovery hook.

[0084] Please refer back to Figure 2 The delivery device 1100 further includes a handle 1130, on which a first drive assembly 1140 and a second drive assembly are disposed. The handle 1130 is connected to the proximal end of the connecting member, and the first drive assembly 1140 is connected to the proximal end of the second tube 1112, and drives the second tube 1112 to move axially relative to the first tube 1111. The second drive assembly is connected to the proximal end of the first tube 1111, and drives the first tube 1111 to move axially relative to the connecting member.

[0085] Please continue to refer to Figure 2The handle 1130 is provided with a slide groove 1131 extending along the axial direction of the handle 1130. The first driving assembly 1140 includes a first slider 1141 and a control block 1142. The first slider 1141 is disposed inside the handle 1130 and can move along the axial direction of the handle 1130, and the first slider 1141 is connected to the proximal end of the second tube 1112. The control block 1142 is movably disposed at the slide groove 1131, and one end of the control block 1142 extends into the handle 1130 and is connected to the slider 1141, and the other end is visible to the outside through the slide groove 1131. The control block 1142 is used to move along the slide groove 1131 under the action of external force, so as to drive the first slider 1141 to drive the second tube 1112 to move along the axis of the first tube 1111, and then drive the proximal end of the auxiliary device 1200 to move along the axis of the first tube 1111, so as to make the auxiliary device 1200 radially expand or contract. The second drive assembly is arranged at the proximal side of the first drive assembly 1140, and may include a knob 1151 and a transmission member (not shown in the figure), the knob 1151 is connected to the transmission member, and the first tube 1111 is connected to the transmission member after extending from the proximal end of the second tube 1112, so that the second drive assembly can drive the first tube 1111 to move along the axial direction of the connecting member. The specific structure of the transmission member can be configured with reference to the prior art.

[0086] Furthermore, the conveyor 1000 further includes a storage tube 1300, and the storage tube 1300 is used to compress the filter 2000. When the medical device is actually used, the recovery part 2100 of the filter 2000 is first detachably connected to the distal structure of the rear release assembly, and then the filter 2000 is compressed using the storage tube 1300. The surgical operation can then be performed as follows:

[0087] First, the jugular vein is punctured and a guidewire is introduced.

[0088] Next, a dilator 1400 (such as Figure 7 As shown) into the sheath 1500 (as shown Figure 8 As shown in the figure), the dilator 1400 and the distal ends of the sheath 1500 are transported along the guide wire to the inferior vena cava, and after angiography is performed through the angiography hole 1410 of the dilator 1400 under an X-ray machine to determine the blood vessel size and the position for placing the filter 2000 (i.e., determining the predetermined position), the distal end of the sheath 1500 is pushed to the predetermined position, and then the dilator 1400 is withdrawn from the body.

[0089] Next, the distal end of the conveyor 1000 carrying the filter 2000 is introduced into the predetermined position along the sheath tube 1500. It is understood that during the conveying process, the auxiliary device 1200 is in a contracted state. It is understood that at this time, the filter 2000 has been separated from the storage tube 1300 and pushed to the distal edge of the sheath tube 1500.

[0090] Next, the sheath 1500 is withdrawn (ie, the sheath 1500 is moved in the direction from the distal end to the proximal end) to radially expand the filter rod 2210 of the filter 2000. At this time, the recovery part 2100 of the filter 2000 is detachably connected to the post-release assembly.

[0091] Then, the sheath 1500 is continuously withdrawn until the auxiliary device 1200 is exposed, and the first drive assembly 1140 drives the second tube 1112 to move from the proximal end to the distal end, so that the auxiliary device 1200 is radially expanded. The movement distance of the second tube 1112 is adjusted according to the size of the blood vessel at the predetermined position so that the auxiliary device 1200 is expanded to a suitable size to effectively support the blood vessel and maintain coaxiality with the blood vessel. Since the filter 2000 is coaxially arranged with the tube assembly 1110 and the auxiliary device 1200, when the auxiliary device 1200 expands to be coaxial with the blood vessel, the posture of the filter 2000 is adjusted accordingly to make the filter 2000 coaxial with the blood vessel.

[0092] Next, the first tube 1111 is driven by the second driving assembly to move from the distal end to the proximal end, and the limiting sleeve 1121 is driven to move toward the proximal end. Since the connecting member remains stationary, the limiting sleeve 1121 moves toward the proximal end relative to the restraining member 1122, so that the restraining member 1122 at least partially extends from the distal end of the limiting sleeve 1121 until the filter 2000 is completely released.

[0093] Then, the conveyor 1000 is withdrawn. The process is as follows: the first tube body 1111 is driven by the second driving assembly to drive the limiting sleeve 1121 to move toward the distal end, and the restraining member 1122 is retracted into the limiting sleeve 1121, and the second tube body 1121 is driven by the first driving assembly to move toward the proximal end, so that the auxiliary device 1200 is radially contracted. Then, the sheath tube 1500 is pushed toward the distal end until the distal end of the conveyor 1000, i.e., the limiting sleeve 1121, enters the interior of the sheath tube 1500. Finally, the sheath tube 1500 and the conveyor 1000 are withdrawn from the body as a whole.

[0094] It should be noted that the dilator 1400 and sheath tube 1500 used in the above contraction process are both dilators and sheath tubes in the prior art, so the embodiment of the present invention does not introduce their structures in detail. In addition, the structure and use method of the storage tube 1300 are also in the prior art and are not described here.

[0095] Fig.10 FIG. 1 is a schematic diagram showing a method of using the conveyor 1000 to convey the filter 2000 from the femoral vein to a predetermined position of the inferior vena cava. In the diagram, the auxiliary device 1200 is located at the distal end of the filter 2000. Fig.10 The structure of the conveyor 1000 used in this usage scenario is similar to Figure 5 The structure of the conveyor 1000 in the usage scenario shown is exactly the same, but the connection method between the conveying device 1100 and the filter 2000 is different.

[0096] Please refer to Figure 3 , Fig. 9 Combined with Fig.10 In this usage scenario, the first filter rod 2210a of the filter 2000 is used to be compressed in the sheath 1500, and the remaining filter rods 2210 are used to be detachably connected to the rear release assembly. Specifically, the distal ends of all the second filter rods 2210b, the third filter rod 2210c, and the fourth filter rod 220d extend into the interior of the limiting sleeve 1121, and the distal end of the fourth filter rod 2210d with the longest length is used to be connected with the restraining member 1122 and the limiting sleeve 1121 through the anchor and / or the anti-puncture member 2410.

[0097] Optionally, please refer to Fig.10 The binding member 1122 is a second slider, and a groove 1123 is provided on the side wall of the binding member 1122. The shape of the groove 1123 can match the shape of the first anchor 2310 and / or the anti-puncture member 2410 on the fourth filter rod 2210c. When the second slider is at least partially located in the limiting sleeve 1121 and the groove 1123 and the inner surface of the limiting sleeve 1121 together enclose a limiting interval, the first anchor 2310 and / or the anti-puncture member 2410 are restricted in the limiting interval, so that the filter 2000 is connected to the rear release assembly. When the binding member 1122 and the limiting sleeve 1121 produce axial relative movement, the groove 1123 is at least partially exposed from the limiting sleeve 1121 and the restriction on the first anchor 2310 and / or the anti-puncture member 2410 is released, and the filter 2000 is released.

[0098] Thus, when the distal end of the medical device is delivered to the predetermined position in the inferior vena cava, the operator first withdraws the sheath tube 1500 until the auxiliary device 1200 is exposed, and the first filter rod 2210a of the filter 2000 is released. Then the operator moves the second tube body 1112 to the distal end to radially expand the auxiliary device 1200 to coaxially support the inner wall of the blood vessel, and then moves the first tube body 1111 to the proximal end, and releases the second filter rod 2210b, the third filter rod 2210c and the fourth filter rod 2210d in sequence. The filter 2000 is gradually released, which not only avoids the filter 2000 from jumping forward, but also avoids the entanglement between the filter rods 2210, and ensures that all the filter rods 2210 are evenly distributed on the inner wall of the blood vessel along the circumferential direction, effectively covers the blood vessel, and keeps it centrally arranged, thereby improving the efficiency of thrombus interception and facilitating the subsequent recovery of the filter 2000.

[0099] It should be noted that, in the embodiment of the present invention, the material of the tube assembly 1110 and the rear release assembly can be a polymer material or a metal material, wherein the second tube body 1112 should have good flexibility, so that when the auxiliary device 1200 expands in the blood vessel, it can drive the filter 2000 to adjust its posture to achieve a centering effect. The sheath 1500 and the dilator 1400 should have good flexibility and can be made of polymer materials such as HDPE or PA, wherein the distal end of the sheath 1500 should have a first developing element 1510, and the distal end of the dilator 1400 has a second developing element 1420 and angiography hole 1410. The materials of the first developing element 1510 and the second developing element 1420 can be tantalum, platinum-tungsten alloy or platinum-iridium alloy, etc.

[0100] It is understandable that in an alternative embodiment, the first tube body is provided with a perfusion channel, and the auxiliary structure can be a balloon (not shown in the figure), which is sleeved on the first tube body and communicated with the perfusion channel so that a filling agent is introduced into the balloon to expand the balloon. According to the actual use scenario, the balloon can be located on the proximal side or the distal side of the limiting sleeve of the rear release component. In addition, when a balloon is used as the auxiliary device, the second tube body and the first drive component can be omitted.

[0101] Although the present invention is disclosed as above, it is not limited thereto. Those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A medical device, characterized in that: include: A delivery device and an implant; the delivery device comprises a delivery device and an auxiliary device, the delivery device comprises a tube assembly and a rear release assembly, the tube assembly comprises at least a first tube body and a second tube body, the second tube body is sleeved on the outside of the first tube body and can generate axial relative movement with the first tube body; the distal structure of the rear release assembly is partially connected to the first tube body and is coaxially arranged with the first tube body; the auxiliary device is sleeved on the first tube body and is located on the proximal side of the distal structure, and the proximal end of the auxiliary device is connected to the distal end of the second tube body and moves synchronously with the second tube body, and the distal end of the auxiliary device and the first tube body remain relatively stationary in the axial direction; the implant is detachably connected to the distal structure of the rear release assembly; The auxiliary device comprises a first transition section, a main section, and a second transition section which are axially connected in sequence, and the outer diameters of the first transition section and the second transition section decrease in a direction away from the main section; the length of the first transition section is smaller than the length of the second transition section, and the first transition section is closer to the implant; The medical device is configured as the delivery device for delivering and releasing the implant to a predetermined position in a target cavity, and during the process of releasing the implant, the second tube body moves relative to the first tube body in a proximal to distal direction so that the auxiliary device expands radially and releases the implant at the predetermined position in a predetermined posture.

2. The medical device according to claim 1, characterized in that The outer diameter of at least some sections of the main body section is greater than or equal to the maximum outer diameter of the first transition section and the second transition section.

3. The medical device according to claim 1, characterized in that The conveying device also includes a handle, on which a first driving assembly is disposed. The first driving assembly is connected to the proximal end of the second tube body and is used to drive the second tube body to perform axial movement relative to the first tube body.

4. The medical device according to claim 1, characterized in that The rear release assembly comprises a limiting sleeve, a restraining member and a connecting member, wherein the limiting sleeve and the restraining member constitute the distal end structure of the rear release assembly; the limiting sleeve is connected to the first tube body and communicates with the first tube body, and the limiting sleeve and the first tube body remain relatively stationary in the axial direction; the restraining member is used to be arranged in the limiting sleeve; the connecting member is arranged inside the first tube body and can generate axial relative movement with the first tube body, and the distal end of the connecting member is connected to the restraining member; The rear release component is configured such that when the restraining member is at least partially located inside the limiting sleeve, the restraining member cooperates with the limiting sleeve and is detachably connected to the implant; when the first tube body moves relative to the connecting member, so that the restraining member is at least partially exposed from the distal end of the limiting sleeve and the restraining member is released from the limiting sleeve, the rear release component is released from the implant.

5. The medical device according to claim 4, characterized in that The conveying device also includes a handle, on which a second drive assembly is provided; the handle is connected to the proximal end of the connecting member, and the second drive assembly is connected to the proximal end of the first tube body and is used to drive the first tube body to perform axial movement relative to the connecting member.

6. The medical device according to claim 4, characterized in that The implant comprises a plurality of filter rod groups and a recovery part, the proximal ends of all the filter rod groups are connected to the recovery part, and each filter rod group comprises a plurality of filter rods; the lengths of the filter rods in different filter rod groups are unequal, the lengths of all the filter rods in the same filter rod group are equal, and all the filter rods in the same filter rod group are symmetrically arranged around the axis of the implant; The recovery portion is used to be detachably connected to the rear release assembly; or, The medical device also includes a sheath, the shortest filter rod is used to be compressed in the sheath, the distal ends of the remaining filter rods are used to extend into the interior of the limiting sleeve, and the longest filter rod distal end is used to cooperate with the restraining member and the limiting sleeve.

7. The medical device according to claim 4, characterized in that The restraining member is a slider, and a groove is provided on the side wall of the slider; The medical device is configured such that when the slider is at least partially located within the limiting sleeve, the groove and the inner surface of the limiting sleeve jointly limit the position of the proximal end or the distal end of the implant, so that the implant is connected to the rear release component; when the slider moves axially relative to the limiting sleeve and exposes the groove from the limiting sleeve, the rear release component is disconnected from the implant.

8. The medical device according to claim 4, characterized in that The restraining member is an elastic member; the medical device is configured such that when the elastic member is located in the limiting sleeve, the elastic member is bent to form a hook to hook the implant, and the limiting sleeve applies radial pressure to the elastic member to keep the elastic member in the shape of the hook; When the elastic member at least partially extends out of the limiting sleeve, the limiting sleeve releases the radial pressure applied to the elastic member and restores the elastic member to a state without the hook, so that the elastic member releases the implant.

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