MEDICAL DEVICE

Abstract

The present invention presents a medical device comprising a delivery mechanism and an implant. The delivery mechanism includes a delivery component and an assist component connected to the delivery component, configured to expand or contract radially with respect to the delivery component. The implant is detachably connected to the delivery component. The delivery mechanism is configured to deliver the implant to a predetermined position within a target lumen and release the implant. The assist component expands radially during implant release to deliver the implant in a predetermined shape at the predetermined position. The advantage of the medical device is that the implant is positioned in a predetermined shape within the target lumen, improving the efficiency of thrombus interception and facilitating subsequent retrieval.

Description

MEDICAL DEVICE TECHNICAL FIELD The present invention relates to the technical field of a medical instrument and, more specifically, to a medical device. BACKGROUND Venous thromboembolism (VTE) is a common clinical condition with a high incidence and mortality rate. VTE includes deep vein thrombosis (DVT) and pulmonary embolism (PE). DVT typically occurs in the veins of the lower extremities, while PE results primarily from thrombi that form in the venous system or the right side of the heart and then travel to the pulmonary artery. This is a leading cause of illness and death. Anticoagulation therapy has always been the gold standard for treating venous thromboembolism (VTE), aiming to prevent thrombosis formation, prevent pulmonary embolism (PE), and reduce the patency of embolized veins. If a patient has a contraindication to anticoagulation or experiences blood complications and must therefore discontinue anticoagulation, a vena cava filter (VCF) can be implanted to intercept the fallen thrombus and prevent fatal PE. Existing filters are prone to tilting when implanted in the inferior vena cava and fail to achieve the desired thrombus interception effect. Furthermore, existing filters are also prone to displacement after implantation, which hinders subsequent filter retrieval. SUMMARY OF THE INVENTION The object of the present invention is to present a medical device by which an implant with a predetermined shape can be released into a target lumen, thereby improving the effect on the interception of thrombi and thus achieving the therapeutic effect. 238681 1820126 of 23 To achieve the aforementioned object, the present invention provides a medical device comprising a delivery mechanism and an implant, wherein the delivery mechanism comprises a delivery component and an assist component that is connected to the delivery component and configured to expand or shrink radially with respect to the delivery component, and the implant is connected to the delivery component in such a way as to allow it to be disassembled; where the delivery mechanism is configured to deliver the implant in a predetermined position in a target lumen and release said implant, and the assisting component is radially expanded during implant release to release the implant in a predetermined shape in the predetermined position. Optionally, the delivery component comprises a tube assembly and a retro-release component; the tube assembly comprises at least a first tube; the retro-release component has a distal structure that is partially connected to the first tube and coaxially to the first tube; the assist component is sheathed over the first tube and proximal to the distal structure; the implant is detachably connected to the distal structure of the retro-release component. Optionally, the assist component comprises a first transition section, a main section, and a second transition section that are connected axially and successively, and the outer diameter of the first transition section and the outer diameter of the second transition section decrease away from the main section; where the assist component is configured to at least partially move in the axial direction of the first tube to radially expand or contract the assist component. Optionally, an outside diameter of at least some segments of the main section is greater than or equal to the maximum outside diameter of the first transition section and the second transition section. Optionally, the tube assembly also comprises a second tube that is 238681 1820126 of 23 encases over the first body and moves axially in relation to the first tube and the distal structure; where the assist component has a distal end that remains stationary relative to the first tube, and a proximal end that is connected to the distal end of the second tube and moves synchronously with the second tube. Optionally, the delivery component further comprises a handle provided with a first drive assembly that is connected to a proximal end of the second tube and is configured to drive the second tube to move axially relative to the first tube. Optionally, the first transition section and the second transition section are symmetrically arranged at two axial ends of the main section; or where a length of the first transition section is less than a length of the second transition section, and the first transition section is closer to the implant. Optionally, the assist component is a balloon that is connected and in communication with a defined perfusion channel in the first tube, and the perfusion channel is configured to fill an agent inside the balloon. Optionally, the retro-release component comprises a limit sleeve, a clamping member, and a connector, wherein the limit sleeve and the clamping member constitute the distal structure of the retro-release component; the limit sleeve is connected to and in communication with the first tube; the limit sleeve is axially stationary relative to the first tube; the clamping member is configured to be received in the limit sleeve; the connector is inserted into the first tube and moves relative to the first tube; and a distal end of the connector is connected to the clamping member. where the retaining member is connected to the limit sleeve and detachably connected to the implant when the retaining member is at least partially located within the limit sleeve, and the retro-release component disconnects from the implant when the retaining member is at least 238681 1820126 of 23 partially exposed of a distal end of the limit sleeve and the clamping member is disconnected from the limit sleeve, due to a movement of the first tube relative to the connector. Optionally, the delivery component further comprises a handle provided with a second drive assembly, the handle connected to a proximal end of the connector, the second drive assembly connected to a proximal end of the first tube and configured to drive the first tube to move axially relative to the connector. Optionally, the implant comprises a plurality of filter rod groups and a retrieval part, each of the filter rod groups comprising a plurality of filter rods, proximal-to-heart ends of the filter rods in all filter rod groups connected to the retrieval part; wherein the filter rods in the different filter rod groups have different lengths, and all the filter rods in the same filter rod group have the same length and are arranged symmetrically around an axis of the implant; where the retrieval portion is configured to connect detachably to the retro-release component; or the medical device further comprises a sheath, where the shorter filter rods are configured to be compressed in the sheath, the distal-to-the-core ends of the remaining filter rods are configured to be inserted into the limit sleeve, and the distal-to-the-core ends of the longer filter rods are configured to connect to the clamping member and the limit sleeve. Optionally, the clamping member is a slider that has a defined side wall with a slot; where the groove and an internal surface of the limit sleeve together confine a position of a proximal-to-the-heart or distal-to-the-heart end of the implant such that they connect the implant to the retro-release component when the slider is at least partially received in the limit sleeve, and the 238681 1820126 of 23 retroactive release component disengages from the implant when the slider moves axially relative to the limit sleeve to expose the limit sleeve groove. Optionally, the retaining member is an elastic member; when the elastic member is received in the limit sleeve, the limit sleeve applies radial pressure to the elastic member to shape the elastic member into a hook to engage the implant; when the elastic member protrudes at least partially from the limit sleeve, the radial pressure applied by the limit sleeve to the elastic member is released, and the elastic member returns to a shape that does not have the hook to release the implant. Compared to the prior art, the medical device according to the present invention has the following advantages. The medical device includes a delivery mechanism and an implant. The delivery mechanism comprises a delivery component and an assist component connected to the delivery component, configured to expand or contract radially. The implant is detachably connected to the delivery component. The delivery mechanism is configured to deliver the implant to a predetermined position within a target lumen and release it. The assist component expands radially during implant release, ensuring the implant is released in a predetermined shape and position. This prevents the reduced efficiency in intercepting thrombi resulting from the implant deviating from its predetermined shape, thereby enhancing the therapeutic effect. Furthermore, the implant can be released by the step-by-step retroactive release component to prevent displacement due to deviation from a predetermined position during release. Additionally, at least some of the implant's filter rods are provided with anchors to penetrate the inner wall of the target lumen, thus maintaining the implant in its predetermined position. A puncture-proof member is also provided to limit the depth to which the anchor can penetrate the inner wall of the target lumen, thereby preventing the 238681 1820126 of 23 anchor drill through the inner wall of the target lumen and thus prevent damage to it. BRIEF DESCRIPTION OF THE DRAWINGS The drawings are used for a better understanding of the present invention, and in no case do they limit it. Fig. 1 is a schematic diagram showing a structure of the medical device according to one embodiment of the present invention, where a filter is not shown; Fig. 2 is a schematic diagram showing a structure of a medical device delivery mechanism according to one embodiment of the present invention; Fig. 3 is a schematic diagram showing a medical device filter structure according to one embodiment of the present invention; Fig. 4 is a schematic diagram of the medical device in use according to one embodiment of the present invention, showing a delivery mechanism that delivers a filter to the inferior vena cava through the jugular vein; Fig. 5 is a schematic diagram showing the connection between a retroactive release component and a filter in the medical device according to one embodiment of the present invention; Fig. 6 is a schematic diagram showing the connection between the retroactive release component and the filter in the medical device according to another embodiment of the present invention; Fig. 7 is a schematic diagram showing a structure of an expander according to another embodiment of the present invention; Fig. 8 is a schematic diagram showing a sheath structure according to another embodiment of the present invention; Fig. 9 is a schematic diagram of the medical device in use according to one embodiment of the present invention, showing a delivery mechanism that delivers a filter to the inferior vena cava through the jugular vein; 238681 1820126 of 23 Fig. 10 is a schematic diagram showing the connection between a retroactive release component and a filter in the medical device according to one embodiment of the present invention. List of reference symbols: 1000: delivery mechanism; 1100: delivery component; 1110: set of tubes; 1111: first tube, 1112: second tube; 1121: limit sleeve, 1122: fastening member; 1130: handle; 1131: slot, 1142: manipulator; 1140: first drive assembly; 1141: first slider / slider control; 1151: knob; 1200: assistance component; 1210: first transition section, 1220: main section, 1230: second transition section; 1300: storage tube; 1400: expander; 1410: radiographic hole, 1420: second viewing element; 1500: pod; 1510: first display element; 2000: Filter; 2100: recovery part; 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: puncture-proof member. 238681 1820126 of 23 DETAILED DESCRIPTION The embodiments of the invention are described by specific examples, and those skilled in the art will be able to readily understand other advantages and functions of the invention based on the information disclosed herein. The invention can be implemented or applied in different embodiments, and the details in the specification may be amended or changed without departing from the spirit of the invention. It should be noted that the figures provided in the present embodiment only illustrate the basic idea of ​​the invention, showing only the components related to the present invention rather than the number, shape, and size of the components in actual use. The configuration, number, and proportion of the components in actual use may optionally be modified, and the arrangement of the components may be more complex. Furthermore, the embodiments described below each have one or more technical features, but this does not mean that all the technical features of the invention must be implemented together, or that only some or all of the different embodiments are implemented separately. In other words, on the basis that implementation is possible, those skilled in the art may selectively implement, according to design standards or actual needs, some or all of the technical features in any embodiment, or some or all of the technical features of the multiple embodiments, in order to increase the flexibility of the present invention. As used in this specification, the singular forms of the article “a / an”, the numeral “one”, and the adjective / pronoun “this / these” include their plurals, and the plural form includes more than two objects, unless explicitly specified otherwise. As used in this specification, the term “or” is generally used to include the meaning of “and / or”, unless explicitly specified otherwise, and the terms “installation”, “connection”, and “coupling” are generally understood to mean, for example, a fixed connection, a detachable connection, or an integrated connection. It may well be a mechanical connection or a 238681 1820126 of 23 electrical connection. It may be a direct connection or an indirect connection by means of an intermediate means, and it may be an intercommunication between two elements or an interaction between two elements. Those skilled in the art will be able to understand the specific meaning of the foregoing terms in the present invention for each specific circumstance. To clarify the purpose, advantages, and features of the present invention, it will be described in detail along with the drawings. It should be noted that the drawings are in a highly simplified form and not to scale, and are intended only to provide a clear illustration of embodiments of the invention. The same or similar reference symbols in the drawings represent the same or similar parts. Fig. 1 is a schematic diagram showing a structure of the medical device; Fig. 2 is a schematic diagram showing a structure of a delivery mechanism 1000 of the medical device; Fig. 3 is a schematic diagram showing a structure of a filter 2000 of the medical device. Referring to Figures 1 to 3, the medical device includes a delivery mechanism 1000 and an implant, for example, a filter 2000. The delivery mechanism 1000 includes a delivery component 1100 and an assist component 1200 that is connected to the delivery component 1100 and configured to expand or contract in a radial direction of the delivery component 1100; the filter 2000 is detachably connected to the delivery component 1100. The delivery mechanism 1000 is configured to deliver the filter 2000 to a predetermined position in a target lumen and release it in that position. During the release of the filter 2000, the assist component 1200 expands radially in the radial direction of the delivery component 1100, and the filter 2000 is released in a predetermined shape in the predetermined position.Generally, the 2000 filter can be implanted in the inferior vena cava to intercept the thrombus and prevent it from entering the heart and then the pulmonary artery, causing a pulmonary embolism. In practice, when the 2000 filter is implanted in the inferior vena cava, central placement is preferred to enhance the thrombus-capturing effect. The term “central” is used to describe the central placement of the filter. 238681 1820126 of 23 means that filter 2000 is arranged coaxially with the inferior vena cava. In this case, the target lumen is the inferior vena cava, and the predetermined shape of filter 2000 may refer to that in which filter 2000 is coaxial with the inferior vena cava. In one embodiment of the present invention, assist component 1200 is connected to delivery component 1100, and assist component 1200 is configured to assist the release of filter 2000 so that filter 2000 can be released in a predetermined shape (i.e., coaxially) into the inferior vena cava, thereby enhancing the interception effect of filter 2000 on the thrombus and improving the therapeutic effect. It is understood that after the release of filter 2000, delivery component 1100 is removed together with assist component 1200. In detail, with reference to Fig. 2, in some embodiments, the assisting component 1200 preferably has a tubular mesh structure and includes a first transition section 1210, a main section 1220, and a second transition section 1230 that are axially connected sequentially, with the outer diameter of the first transition section 1210 and the outer diameter of the second transition section 1230 decreasing as they move away from the main section 1220. The assisting component 1200, the delivery component 1100, and the filter 2000 are arranged coaxially. After the delivery component 1100 delivers the assisting component 1200 and the filter 2000 to a predetermined position in the lower vena cava, the filter 2000 can be released.During the release of filter 2000 (i.e., when filter 2000 is not fully released), the assisting component 1200 expands radially. At least part of the outer wall of the main section 1220 of the assisting component 1200 is in contact with the inner wall of the inferior vena cava. The main section 1220 is then supported by the inner wall of the inferior vena cava, and the assisting component 1200 is coaxial with the inferior vena cava. Filter 2000 is thus coaxial with the inferior vena cava. The assisting component 1200, in the embodiment of the present invention, is preferably a self-expanding structure that does not obstruct blood flow when it expands in the inferior vena cava and rests against the vessel wall. Those skilled in the art know that the self-expanding structure... 238681 The 1820126 of 23 expandable component is made of a highly elastic material and can deform under external pressure. Once the external pressure is removed, it will return to its original shape due to its high elasticity. Generally, the material of the self-expanding structure can be a shape-memory material, such as a nickel-titanium alloy. The 1200 assist component can be formed from wire mesh or by cutting a tube. In this embodiment, the outside diameter of at least a portion of the main section 1220 is greater than or equal to the maximum outside diameter of the first transition section 1210 and the second transition section 1230. Preferably, the main section 1220 includes a plurality of cylindrical segments, each with an outside diameter equal to the maximum outside diameter of the first transition section 1210 and the second transition section 1230. The cylindrical segments are configured to contact the wall of the lower vena cava so that the main section 1220 is in surface contact with the inner wall of the vessel, thus providing a large contact area and stronger support. The length of the main section 1220 can be determined according to actual requirements.Alternatively, the projection of the profile of the outer wall of the main section 1220 onto a plane parallel to the axis of the assisting component 1200 can be a curve provided that the main section 1220 can be next to the inner wall of the inferior vena cava after expansion and the assisting component 1200 can be positioned coaxially with the inferior vena cava. In some embodiments, the first transition section 1210 and the second transition section 1230 are radially symmetrical and are arranged at both axial ends of the main section 1220. In other embodiments, the length of the first transition section 1210 is less than the length of the second transition section 1230, and the first transition section is closer to the filter 2000 in order to keep the filter 2000 coaxial with the assist component 1200 in the blood vessel. With specific reference to Fig. 3, in an exemplary embodiment, the 238681 1820126 of 23 Filter 2000 includes a recovery part 2100 and a plurality of filter rod groups. Each filter rod group has a plurality of filter rods 2210. The proximal-to-core ends of the filter rods in all filter rod groups are connected to the recovery part 2100. The filter rods 2210 in different filter rod groups have different lengths. All filter rods 2210 in the same filter rod group have the same length and are arranged symmetrically around the axis of the filter 2000. The connection between the filter 2000 and the delivery component 1100 will be described later in conjunction with the usage scenario. Optionally, the shorter 2210 filter rods are configured to be in line with the vessel wall, and an anchor is provided at each distal end of the remaining filter rods. The anchor is configured to penetrate the vessel wall so that the remaining 2210 filter rods are in point contact with the vessel wall. In the memory, the 2000 filter has four groups of filter rods as an example. The four groups of filter rods are the first, second, third, and fourth filter groups. The first group of filter rods has six first filter rods 2210a, the second group of filter rods has two second filter rods 2210b, the third group of filter rods has two third filter rods 2210c, and the fourth group of filter rods has two fourth filter rods 2210d. The lengths of the first filter rods 2210a, the second filter rods 2210b, the third filter rods 2210c, and the fourth filter rods 2210d increase sequentially.Therefore, the first filter rods 2210a are configured to be in linear contact with the vessel wall, and an anchor is formed on each of the second filter rods 2210b, the third filter rods 2210c, and the fourth filter rods 2210d. Those skilled in the art will understand that the length of each of the filter rods 2210 refers to the size of the filter rod 2210 in the axial direction when it is in a compressed configuration. Optionally, each of the first 2210a filter rods has a first 238681 1820126 of 23 part 2211a, a second part 2212a, and a third part 2213a successively connected to each other from the proximal-to-heart end to the distal-to-heart end. The distance between the first part 2211a and the filter axis 2000 gradually increases in one direction from the proximal-to-heart end to the distal-to-heart end, and the distance between the third part 2213a and the filter axis 2000 is greater than the distance between the first part 2211a and the filter axis 2000. The second part 2212a is actually a transition to prevent the first filter rod 2210a from forming a sharp corner. The second filter rods 2210b, the third filter rods 2210c, and the fourth filter rods 2210d are all straight. The distance between the filter rods and the filter shaft 2000 gradually increases in one direction from the proximal-to-heart end to the distal-to-heart end. The anchors include first anchors 2310 and second anchors 2320. The first anchors 2310 and second anchors 2320 are formed on the different filter rods 2210. When the first and second anchors penetrate the vessel wall, the first anchors 2310 are configured to prevent the filter 2000 from moving in a direction from the proximal-to-heart end to the distal-to-heart end, and the second anchors 2320 are configured to prevent the filter 2000 from moving in a direction from the distal-to-heart end to the proximal-to-heart end, so that the filter 2000 is fixed in a predetermined position to effectively intercept the thrombus.In this embodiment, each of the first anchors 2310 can be straight, the proximal-to-heart end of each of the first anchors 2310 is connected to the distal-to-heart end of each corresponding filter rod 2210, and the distal-to-heart end of each of the first anchors 2310 is a free end. Each of the second anchors 2320 serves as a prong, and the free end of each of the second anchors 2320 is disposed toward the proximal-to-heart end of the filter 2000. Generally, the filter rod 2210 on which the second anchor 2320 is formed is shorter than the filter rod 2210 on which the first anchor 2310 is formed. 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 either the second anchor 2320 (shown in Fig. 3) or the first anchor (not shown) 13 238681 1820126 of 23 is formed on the third filter rod 2210c. In addition, a puncture-proof member 2410 is formed on at least some, preferably all, of the filter rods 2210 on which the anchors are formed. The puncture-proof member 2410 is configured to prevent the anchor from piercing the vessel wall. Those skilled in the art will understand that the shape and size of the puncture-proof member 2410 may be changed for this purpose. It should be noted that, although the 2000 filter shown in Fig. 3 is presented as an example, it is understood that the filter in the prior art can also be combined with the 1000 delivery mechanism to constitute the medical device. Next, the preferred structures of the medical device will be described along with its usage scenario. Hereafter, the “distal-to-heart end” and “proximal-to-heart end” mentioned in this document refer to the positional relationship to the patient’s heart after implantation of the Filter 2000. Generally, the “distal-to-heart end” refers to the end of the Filter 2000 farthest from the heart, and the “proximal-to-heart end” refers to the end of the Filter 2000 closest to the heart. The terms “distal end” and “proximal end” describe the orientation, position, or relative direction of the elements or actions in the Delivery Mechanism 1000 from the perspective of the operator using the medical device. The “distal end” refers to the end of the Delivery Mechanism 1000 that first enters the patient’s body, and the “proximal end” refers to the end closest to the user during the use of the Delivery Mechanism 1000. Fig. 4 is a schematic diagram of the medical device whose distal end enters the inferior vena cava through the jugular vein, where the 2000 filter is located at the distal end of the 1200 assist component. Referring to Fig. 4 in conjunction with Fig. 2, the delivery component 1100 has a tube assembly 1110 and a feedback release component. The tube assembly 1110 includes at least one first tube 1111. The distal structure of the feedback release component is partially connected to the first tube 111, preferably to the distal end of the first tube 1111. The distal structure of the feedback release component is arranged coaxially with the first tube. 238681 1820126 of 23 1111. The assist component 1200 is sheathed over the first tube 1111 and is configured to move at least partially in the axial direction of the first tube 1111 to expand or reduce the assist component 1200. The proximal end (in particular the retrieval portion 2100) of the filter 2000 is detachably connected to the distal structure of the retro-release component. The arrangement of the retro-release component makes it convenient not only to control the expansion of the assist component 1200 during the release of the filter 2000, but also to release the filter 2000 step by step (i.e., releasing the filter rods and then disconnecting the retro-release component from the retrieval portion 2100), thus preventing displacement of the filter 2000 from a predetermined position resulting from the release of the filter 2000 as a whole. Furthermore, the 1110 tube assembly also includes a second 1112 that is sleeved over the first 1111 tube and is axially movable relative to the first 1111 tube. The distal end of the assist component 1200 remains stationary relative to the first 1111 tube, and the proximal end of the assist component 1200 is connected to the distal end of the second 1112 tube and moves synchronously with the second 1112 tube so as to be axially movable relative to the first 1111 tube. As a result, the assist component 1200 can be radially expanded or contracted. The retro-release component may include a limit sleeve 1121, a restraint member 1122, and a connector (not shown). The limit sleeve 1121 and the restraint member 1122 together constitute the distal structure. The limit sleeve 1121 may be a hollow cylindrical tube connected to the first tube 1111 (in particular, to the distal end of the first tube 1111) and held axially stationary to the first tube 1111. The limit sleeve 1121 is in common with the first tube 1111. The restraint member 1122 is configured to be inside the limit sleeve 1121 and is axially movable relative to the limit sleeve 1121. The connector is inserted into the first tube 1111 and is axially movable relative to the first tube 1111, and the distal end of the connector is connected to the restraint member 1122. 238681 1820126 of 23 restriction 1122 is engaged with the limit sleeve 1121 and connected to the recovery portion 2100 of the filter 2000 when the restriction member 1122 is at least partially inside the limit sleeve 1121. When the restriction member 1122 moves relative to the limit sleeve 1121 and at least partially protrudes from the distal end of the limit sleeve 1121 to disengage from the limit sleeve 1121, the retro-release component disconnects from the recovery portion 2100. In an optional implementation, referring to Fig. 5, the retrieval part 2100 is a retrieval hook. The restraint member 1122 is an elastic member, for example, having a self-expanding structure. When the restraint member 1122 is inside the limit sleeve 1121, the restraint member 1122 bends to form a hook to engage the retrieval hook, and the limit sleeve 1121 applies radial pressure to the restraint member 1122 to maintain it in the hook shape so that the back-release component remains connected to the filter 2000.When the clamping member 1122 protrudes at least partially from the limit sleeve 1121 and the radial pressure applied to the clamping member 1122 by the limit sleeve 1121 is removed, the clamping member 1122 returns to a non-hook-like shape, and the retroactive release component releases the filter 2000, disconnecting them from each other. The self-expanding structure here refers to the fact that the structure itself has good strength, can deform under pressure, and once the pressure is removed, the structure returns to its original shape under its own resistance. Generally, the self-expanding structure is made of a shape-memory alloy such as a nickel-titanium alloy. Optionally, in another embodiment, as shown in Fig. 6, the retrieval part 2100 can be a retrieval hook with a connecting hole. The clamping member 1122 is an elastic member, for example, it has a self-expanding structure. When the clamping member 1122 is inside the limit sleeve 1121, the clamping member 1122 bends to serve as a hook that 238681 1820126 of 23 partially extends into the connection hole to hook the recovery hook. Referring back to Fig. 2, the delivery component 1100 further comprises a handle 1130 provided with a first drive assembly 1140 and a second drive assembly. The handle 1130 is connected to the proximal end of the connector, the first drive assembly 1140 is connected to the proximal end of the second tube 1112 to drive 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 to drive the first tube 1111 to move axially relative to the connector. Referring to Fig. 2, handle 1130 has a groove 1131 extending along an axial direction of the handle 1130. The first drive assembly 1140 includes a first slider 1141 and a manipulator 1142. The first slider 1141 is disposed within the handle 1130 and moves along an axial direction of the handle 1130, and the first slider 1141 is connected to a proximal end of the second tube 1112. The manipulator 1142 is movably disposed in the groove 1131. The manipulator 1142 has one end extending into the handle 1130 to connect to the slider 1141, and another end visible from the groove 1131.The manipulator 1142 is configured to move along the groove 1131 by an external force and actuate the first slider 1141 to drive the second tube 1112 to move along the axial direction of the first tube 1111, thereby driving the proximal end of the assist component 1200 in the axial direction of the first tube 1111 to expand or contract the assist component 1200. The second drive assembly is arranged proximal to the first drive assembly 1140. The second drive assembly includes a knob 1151 and a transmission (not shown) connected to the knob 1151. The first tube 1111 extends from the proximal end of the second tube 1112 to connect with the transmission, so that the second drive assembly can drive the first tube 1111 to move in an axial direction of the connector. 238681 1820126 of 23 specific transmission structure can be configured with reference to prior art. Furthermore, the delivery mechanism 1000 includes a storage tube 1300 configured to compress the filter 2000. When the medical device is used in practice, the retrieval portion 2100 of the filter 2000 is first detachably connected to the distal structure of the retro-release component, and the filter 2000 is then compressed by the storage tube 1300. Surgical procedures can then be performed as follows: First, the jugular vein was punctured and a guide wire was inserted. Next, an expander 1400 (illustrated in Fig. 7) travels into the sheath 1500 (illustrated in Fig. 8), and the distal end of the expander 1400 and sheath 1500 are delivered to the inferior vena cava through the jugular vein, and the radiographic hole 1410 of the expander 1400 is radiographed on an X-ray machine to determine the vessel size and location of the filter 2000 (i.e., verifying the predetermined position), and then the distal end of the sheath 1500 is pushed into the predetermined position, and the expander 1400 is removed from the body. Next, the distal end of the delivery mechanism 1000, which carries the filter 2000, is inserted into the predetermined position along the sheath 1500. It is understood that the assisting component 1200 always retracts during delivery. Consequently, the filter 2000 is now separated from the storage tube 1300 and pushed into the distal edge of the sheath 1500. Next, the 1500 sheath is removed (i.e., the sheath is moved in one direction from the distal end to the proximal end) to radially expand the 2210 rods of the 2000 filter, and the 2100 recovery portion of the 2000 filter is detachably connected to the retro-release component. Next, the sheath 1500 is withdrawn further until the assist component 1200 is exposed, and the second tube 1112 is driven to move in a direction from the proximal end to the distal end by the first drive assembly 1140 so that the assist component 1200 expands into shape 238681 1820126 of 23 radial. The movement of the second tube 1112 can be adjusted according to the size of the vessel in the predetermined position so that the assisting component 1200 can expand to a suitable size to effectively support the vessel and be coaxial with it. Since the filter 2000 is arranged coaxially with the tube assembly 1110 and the assisting component 1200, during the expansion of the assisting component 1200 to be coaxial with the vessel, the shape of the filter 2000 is adjusted accordingly so that the filter 2000 is coaxial with the vessel. Next, the first tube 1111 is driven by the second drive assembly to move it in a direction from the distal end to the proximal end, and the limit sleeve 1121 is driven to move toward the proximal end. Since the connector remains stationary, the limit sleeve 1121 moves toward the proximal end relative to the clamping member 1122, such that the restraint member 1122 protrudes at least partially from the distal end of the limit sleeve 1121 until the filter 2000 is fully released. The delivery mechanism 1000 is then removed, the process of which is described below. The first tube 1111 drives the limit sleeve 1121 to move distally, the clamping member 1122 is received in the limit sleeve 1121, and the second tube 1112 is driven proximally by the first drive assembly so that the assist component 1200 is radially deflected. The sheath 1500 is pushed distally until the distal end of the delivery mechanism 1000 (i.e., the limit sleeve 1121) enters the sheath 1500. Finally, the sheath 1500 and the delivery mechanism 1000 are completely removed from the body. It should be noted that the expander 1400 and sheath 1500 used in the previous shrinking process are the expander and sheath of the prior art. Therefore, the embodiments of the present invention do not describe their structure in detail. Furthermore, the structure and method of use of the storage tube 1300 also belong to the prior art and are not repeated herein. Fig. 10 is a schematic diagram showing that filter 2000 is delivered by delivery mechanism 1000 to a predetermined position in the inferior vena cava 238681 1820126 of 23 through the femoral vein. In Fig. 10, the assist component 1200 is located at the distal end of the filter 2000. Referring to Fig. 10, the structure of the delivery mechanism 1000 in this usage scenario is identical to the structure of the delivery mechanism 1000 shown in Fig. 5, but the connection between the delivery component 1100 and the filter 2000 is different from that in Fig. 5. Referring to Figs. 3, 9, and 10, the first filter rod 2210a of filter 2000 is compressed into the sheath 1500, and the remaining filter rods 2210 are configured to connect detachably to the retro-release component. Specifically, the entire distal-to-core end of the second filter rods 2210b, the third filter rods 2210c, and the fourth filter rods 2210d extend into the limit sleeve 1121, and the distal end of the fourth filter rods 2210d, which are the longest of the filter rods, is connected to the clamping member 1122 and the limit sleeve 1121 by the anchor and / or the puncture-proof member 2410. Optionally, with special reference to Fig. 10, a second slider serves as a clamping member 1122, and the clamping member 1122 has a defined side wall therein with grooves 1123 formed to match the first anchor 2310 and / or the puncture-proof member 2410 on the fourth filter rods 2210d. When the second slider is at least partially inside the limit sleeve 1121, the groove 1123 and the limit sleeve 1121 together define a space where the first anchor 2310 and / or the puncture-proof member 2410 are constrained so that the filter 2000 is connected to the retro-release component.When the clamping member 1122 moves axially relative to the limit sleeve 1121, the slot 1123 is at least partially exposed from the limit sleeve 1121, and the first anchor 2310 and / or the puncture-proof members 2410 are no longer restricted, and the filter 2000 is finally released. Thus, when the distal end of the medical device is delivered to a predetermined position in the inferior vena cava, the operator first withdraws the sheath 1500 until the assist component 1200 is exposed and the first filter rods are released 238681 1820126 of 23 2210a of filter 2000. Next, the operator moves the second tube 1112 distally so that the assist component 1200 expands radially to be supported coaxially on the inner wall of the vessel, then moves the first tube 1111 proximally to successively release the second filter rods 2210b, the third filter rods 2210c, and the fourth filter rods 2210d. Filter 2000 is released gradually, thus preventing displacement of the filter 2000 while also preventing winding between the filter rods 2210, and ensuring that all filter rods 2210 are evenly distributed on the inner wall of the vessel, effectively covering the vessels and remaining central, improving the efficiency for thrombus interception, and facilitating the subsequent retrieval of filter 2000. It should be noted that, in the embodiments of the present invention, the tube assembly 1110 and the retroactive release component may be made of a polymeric or metallic material, and the second tube 1112 must have good flexibility to adjust the shape of the filter 2000 so that the filter 2000 can be centrally positioned when the assist component 1200 expands in the vessel. The sheath 1500 and the expander 1400 must have good flexibility and may be made of a polymeric material such as HDPE or PA. A first viewing element 1510 must be provided at the distal end of the sheath 1500. A second viewing element 1420 and a radiographic hole 1410 must be provided at the distal end of the expander 1400. The material of the first viewing element 1510 and the second viewing element 1420 may be tantalum, a platinum tungsten alloy, or a platinum iridium alloy, or similar materials. It can be understood that, in an alternative embodiment, the first tube is provided with an infusion channel, and a balloon (not illustrated) can serve as an assist component. The balloon is sheathed over the first tube and connected to the infusion channel to inject an agent into the balloon and inflate it. Depending on the actual usage scenario, the balloon can be located proximal or distal to the boundary cuff of the back-release component. Furthermore, the second tube and the first drive assembly can be omitted when using a balloon as the assist component. 238681 1820126 of 23 assistance component. Although the present invention is disclosed in accordance with the foregoing, it is not limited to it. Those skilled in the art may make various modifications and variations of the invention without departing from the spirit and scope of the invention. Therefore, if these modifications and variations of the invention fall within the scope of the claims and equivalent technology, the invention is also intended to include these modifications and variations. 238681 1820126 of 23 20225952036 CRISTIAN DANIEL BITTEL - 20225952036 Digitally signed by PORTALTRAM ITES - INPI Date: 2022.06.03 15:11:21 -03:00 Reason: Digitally Signed by the INPI Location: Buenos Aires, Argentina 1820126

Claims

1. A medical device comprising a delivery mechanism (1000) and an implant, wherein the delivery mechanism (1000) comprises a delivery component (1100) and an assist component (1200) that is connected to the delivery component (1100) and is configured to expand or contract in a radial direction of the delivery component (1100), and the implant is detachably connected to the delivery component (1100); wherein the delivery mechanism (1000) is configured to deliver the implant to a predetermined position in a target lumen and release the implant, and the assist component (1200) expands radially during implant release to release the implant in a predetermined shape, in the predetermined position, characterized in that the assist component (1200) comprises a first transition section (1210),a main section (1220) and a second transition section (1230) that are successively axially connected, and an outside diameter of the first transition section (1210) and an outside diameter of the second transition section (1230) decrease in directions away from the main section (1220), and wherein a length of the first transition section (1210) is less than a length of the second transition section (1230), and the first transition section (1210) is closer to the implant. Ten claims follow.