Conveying device

Abstract

The invention relates to a conveying device which is used for conveying and releasing a stent with a bare stent, the conveying device comprises a first sheath core assembly and a second sheath core assembly, the second sheath core assembly is connected to the first sheath core assembly in a sliding mode in the axial direction, and the second sheath core assembly comprises multiple sets of anchoring parts used for hooking different bare stents; the second sheath core assembly slides relative to the first sheath core assembly and is matched with the first sheath core assembly, so that the multiple groups of anchoring parts release the hooked bare stent in sequence. Through cooperation of the first sheath core assembly and the second sheath core assembly, bare stents are sequentially released in groups, and therefore stimulation of the bare stents to the inner wall of a blood vessel due to elastic expansion is reduced. The bare stents are released in sequence through grouping, and compared with simultaneous release of the bare stents, stimulation to the inner wall of the blood vessel at the same time is obviously reduced.

Description

Technical Field

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

[0002] Stents are commonly used in interventional therapy as implants in the body, such as covered stents or bare stents. These stents are delivered to specific parts of the body via a specific delivery device to treat diseases in that specific area.

[0003] Such stents are typically elastic and compressed radially to a smaller size during delivery. Once they reach their target location within the body, they are released, allowing the stent to expand radially. In existing technologies, after being released from the outer sheath of a delivery device, the stent expands radially, impacting and damaging the inner wall of the blood vessel.

[0004] How to reduce the stimulation to the inner wall of the blood vessel caused by the elastic expansion of the stent during the stent release process is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] Based on this, it is necessary to provide a conveying device to address the above technical problems.

[0006] A delivery device for delivering and releasing a stent with a bare stent, the delivery device comprising: a first sheath-core assembly, and The second sheath core component is axially connected to the first sheath core component. The second sheath core component includes multiple groups of anchoring parts for hooking different bare stents. The second sheath core component slides relative to the first sheath core component and cooperates with the first sheath core component to enable multiple groups of anchoring parts to release the hooked bare stents in turn.

[0007] In one embodiment, the first sheath-core assembly includes a guide head and a first pulling member, and the first pulling member is connected to the guide head to enable the guide head to slide axially relative to the second sheath-core assembly.

[0008] In one embodiment, the guide head includes an abutment portion; The plurality of anchoring portions hook the bare stent when in contact with the abutting portion, so that the bare stent is in a radially restrained state; The multiple groups of anchoring parts are used to successively disengage from the abutting parts and successively release the corresponding hooked bare brackets.

[0009] In one embodiment, the guide head is provided with a receiving groove, and the side wall of the receiving groove forms the abutting portion; The second sheath-core assembly is at least partially capable of entering and exiting the accommodating groove; When the second sheath core assembly is in the accommodating groove, the anchoring portion abuts against the side wall of the accommodating groove to hook the bare stent.

[0010] In one embodiment, the plurality of anchoring portions are staggered in the axial direction, and can be successively disengaged from the abutting portions during the relative sliding of the first sheath-core component and the second sheath-core component along the axial direction.

[0011] In one embodiment, the abutment portion includes an abutment block, and the anchoring portion abuts against the abutment block so that the anchoring portion hooks the bare stent.

[0012] In one embodiment, the number of the abutment blocks corresponds one to one with each group of the anchoring portions, or One abutting block corresponds to at least one group of anchoring portions.

[0013] In one embodiment, the second sheath-core assembly includes an anchor and a second pulling member, wherein the second pulling member is connected to the anchor so that the anchor slides axially relative to the first sheath-core assembly; The anchor member includes the anchor portion.

[0014] In one embodiment, the anchoring portion includes a first anchoring portion and a second anchoring portion, and the first anchoring portion and the second anchoring portion are staggered in the axial direction; Alternatively, the first anchoring portion and the second anchoring portion have different minimum distances from one end of the anchoring member in the axial direction.

[0015] In one embodiment, there are multiple first anchoring portions, and at least two of the first anchoring portions are symmetrically distributed in the radial direction; there are multiple second anchoring portions, and at least two of the second anchoring portions are symmetrically distributed in the radial direction.

[0016] In one embodiment, the anchoring member is provided with a limiting groove for accommodating the bare stent, and the limiting groove is used to limit the circumferential displacement of the bare stent on the anchoring portion; the bare stent passes through the limiting groove and is hooked on the anchoring portion.

[0017] In one embodiment, the anchoring member includes at least two limiting blocks spaced apart in the circumferential direction of the anchoring member, and the limiting groove is formed between the two limiting blocks.

[0018] In one embodiment, the anchoring member includes a limit block having A restraining state against the first sheath-core assembly; In the limiting state, the limiting block limits the relative sliding of the first sheath-core component and the second sheath-core component in at least one axial direction; In the limiting state, the anchoring portion can hook the bare stent.

[0019] In one embodiment, the limit block includes a first limit block and a second limit block of different shapes. In the circumferential direction of the anchor, the first limit block and the second limit block are alternately arranged at intervals. The first limit block includes a positioning portion and a limiting portion. The positioning portion and the limiting portion form a high and low staggered structure in the radial direction. The limiting portion is higher than the positioning portion. The limiting portion is used to support the second sheath core assembly in the axial direction, and the positioning portion is used to support the second sheath core assembly in the radial direction.

[0020] In one embodiment, the anchor member further includes a limiting member, which is spaced apart from the anchor portion. The limiting member is located above the anchor portion. When the bare stent is hung on the anchor portion, the bare stent passes through the space between the limiting member and the anchor portion.

[0021] In one embodiment, the delivery device includes a sheath assembly, which includes a support tube and an outer sheath coaxially sleeved from the inside to the outside, and the stent can extend into the outer sheath and abut against the support tube.

[0022] Beneficial Effects: The coordination of the first and second sheath-core assemblies enables sequential release of bare stents in groups, thereby reducing irritation to the vessel lining caused by elastic expansion of the bare stents. Sequential release of the bare stents in groups significantly reduces irritation to the vessel lining compared to simultaneous release of the bare stents. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of a side-expanded stent graft; Figure 2 and Figure 3 They are schematic structural diagrams of two different working states of a conveying device in one embodiment of the present application; Figure 4 The figure shows the situation where the anchor portion hooks onto the bare stent; Figure 5 This is a schematic diagram of the three-dimensional structure of the second sheath-core assembly in one embodiment of the present application; Figure 6 Shown Figure 5 An expanded view of the side surface of the second sheath core assembly; Figure 7 An expanded view of the side surface of the second sheath-core assembly in another embodiment of the present application; Figure 8 and Figure 9 Schematic diagram of the partial structure of the guide head in two embodiments of the present application; Figure 10 It is a structural schematic diagram of a bare stent of a main body stent hung on an anchoring portion of a delivery device in one embodiment.

[0024] Figure markings: 10, first sheath core assembly; 11, guide head; 111, accommodating groove; 112, abutment portion; 1121, abutment block; 113, guide portion; 12, first traction member; 20, second sheath core assembly; 21, anchoring member; 211, anchoring portion; 2111, top surface; 2112, side surface; 212, limiting groove; 213, limiting block; 2131, positioning portion; 2132, limiting portion; 214, limiting member; 22, second traction member; 31, bare bracket; 32, main bracket; 40, sheath tube assembly; 41, outer sheath tube; 42, support tube. DETAILED DESCRIPTION

[0025] To facilitate understanding of the present invention, the present invention is described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to facilitate a more thorough and comprehensive understanding of the present disclosure.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. Conversely, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0027] In one embodiment of the present application, a delivery device is provided for delivering and releasing a stent with a bare stent.

[0028] A stent, such as a covered stent or a bare metal stent, is elastic only in the radial direction and can be compressed within a sheath of smaller diameter. When the stent is released from the sheath, it expands under its own elasticity, returning to its pre-compression size.

[0029] Figure 1It is a structural diagram of the side unfolding of a coated stent. The coated stent includes a main stent 32, which is a tubular structure in the actual three-dimensional structure. The main stent 32 may include an undulating metal ring as a skeleton and a coating arranged on the inner ring or outer ring of the metal ring. The coated stent also includes a bare stent 31, which refers to a metal support rod that is not covered with a coating. The bare stent 31 is arranged at the end of the main stent 32. In this embodiment, the bare stent 31 includes four, namely two first bare stents 31A and two second bare stents 31B. In the actual three-dimensional structure, the bare stents 31 are arranged in a circle along the circumference of the coated stent, and are arranged in the following manner in the circumferential direction, including one first bare stent 31A, one second bare stent 31B, another first bare stent 31A, and another second bare stent 31B.

[0030] Figure 2 and Figure 3 They are schematic diagrams of the structure of two different working states of the conveying device in one embodiment of the present application. Figure 2 and Figure 3 As shown, the conveying device includes a first sheath core component 10 and a second sheath core component 20, and the second sheath core component 20 is connected to the first sheath core component 10 along an axial sliding direction. The first sheath core component 10 and the second sheath core component 20 can be respectively regarded as two elongated linear structures, and their axial directions extend roughly along their extension directions. The first sheath core component 10 and the second sheath core component 20 can be approximately coaxially arranged, and they can slide relative to each other along the same axis. In one embodiment, the first sheath core component 10 is sleeved on at least a portion of the outer periphery of the second sheath core component 20, and during their relative sliding process, the first sheath core component 10 slides on the outer periphery of the second sheath core component 20.

[0031] The second sheath core assembly 20 includes multiple groups of anchoring portions 211 for hooking different bare stents 31. Figure 4 The schematic diagram shows a bare stent 31 of a covered stent being hooked by an anchoring portion 211, wherein the second sheath core assembly 20 is inserted into the main stent 32, and multiple bare stents 31 are hooked by different anchoring portions 211. After being hooked, the portion of the second sheath core assembly 20 having the anchoring portion 211 extends into the receiving groove 111 of the first sheath core assembly 10, so that the anchoring portion 211 is close to the inner wall of the receiving groove 111, thereby preventing the bare stent 31 from expanding radially. Of course, in other embodiments, the structure of the first sheath core assembly 10 for cooperating with the anchoring portion 211 to limit the radial expansion of the bare stent 31 can also be in other forms, which will be illustrated below.

[0032] In operation, the second sheath core component 20 is slid relative to the first sheath core component 10 and is engaged with the first sheath core component 10, for example, Figure 3In the process, the first sheath core assembly 10 is kept in place, and the second sheath core assembly 20 is slid downward, so that the multiple groups of anchoring portions 211 are successively disengaged from the receiving groove 111. Since there are multiple groups of anchoring portions 211 and their axial positions are different, as the second sheath core assembly 20 slides relative to the first sheath core assembly 10, different anchoring portions 211 are successively disengaged from the receiving groove 111. The anchoring portions 211 that are first disengaged from the receiving groove 111 are no longer restricted by the inner wall of the receiving groove 111, and the bare stents 31 hanging on these anchoring portions 211 can expand radially; the bare stents 31 hanging on the anchoring portions 211 that are later disengaged from the receiving groove 111 will expand radially only when they are no longer restricted by the inner wall of the receiving groove 111. In this way, the multiple groups of anchoring portions 211 successively release the hooked or hung bare stents 31.

[0033] In other words, the coordination of the first sheath-core assembly 10 and the second sheath-core assembly 20 enables sequential release of the bare stents 31 in groups, thereby reducing irritation to the inner wall of the blood vessel caused by the elastic expansion of the bare stents 31. By sequentially releasing the bare stents 31 in groups, irritation to the inner wall of the blood vessel is significantly reduced compared to simultaneous release of the bare stents 31.

[0034] In one embodiment, Figure 2 As shown, the first sheath-core assembly 10 includes a guide head 11 and a first traction member 12. The first traction member 12 is connected to the guide head 11 to enable the guide head 11 to slide axially relative to the second sheath-core assembly 20. The guide head 11 can be made of a soft material and is used to guide the delivery device within a blood vessel. The first traction member 12 is made of a slender flexible tube, which provides a certain degree of support and is connected to the guide head 11. By pushing, pulling, or rotating the first traction member 12, the guide head 11 can be driven to advance, retreat, or rotate within the blood vessel.

[0035] In one embodiment, Figure 2As shown, the guide head 11 includes a guide portion 113 and an abutment portion 112, and the guide portion 113 and the abutment portion 112 are connected in the axial direction. The guide portion 113 is used to guide the direction of advancement of the conveying device. In order to facilitate the passage of the guide portion 113 in the blood vessel, the shape of the guide portion 113 is thin at the front end and thick at the rear end, that is, it is conical as a whole, which makes the front end of the guide portion 113 more flexible and easy to bend and enter different bifurcated blood vessels. The abutment portion 112 is used to cooperate with the second sheath core component 20 to lock the bare stent 31 between the first sheath core component 10 and the second sheath core component 20. When the bare stent 31 is locked between the first sheath core component 10 and the second sheath core component 20, the bare stent 31 is restricted between the first sheath core component 10 and the second sheath core component 20, and cannot expand freely in the radial direction. The abutment portion 112 can also cooperate with the second sheath-core assembly 20 to allow the bare stent 31 to be separated from the first sheath-core assembly 10 and the second sheath-core assembly 20. At this time, the bare stent 31 is no longer restricted by the first sheath-core assembly 10 and the second sheath-core assembly 20 and can expand freely in the radial direction. It should be noted that the above-mentioned expansion or expansion of the bare stent 31 does not refer to the expansion or expansion of the material of the bare stent 31 itself, but refers to the expansion or expansion of the geometric shape formed by the bare stent 31.

[0036] In one embodiment, the abutment portion 112 cooperates with the second sheath core assembly 20 such that the multiple sets of anchoring portions 211 on the second sheath core assembly 20, while in abutment with the abutment portion 112, hook onto the bare stent 31, placing the bare stent 31 in a radially constrained state. Furthermore, the second sheath core assembly 20 is capable of axial movement relative to the first sheath core assembly 10, thereby enabling the multiple sets of anchoring portions 211 to sequentially disengage from the abutment portion 112. Since each set of anchoring portions 211 hooks onto some bare stents 31, the anchoring portions 211 that disengage from the abutment portion 112 first release the hooked bare stents 31, while the anchoring portions 211 that disengage from the abutment portion 112 later release the hooked bare stents 31 later. The abutment of two parts can be such that the surfaces of the two connections abut against each other, preventing a third part from passing between the two connections. When the two abutting parts separate, the third part can pass between the two parts. Furthermore, the abutment fit of two parts may also be that the surfaces of the two parts do not completely abut against each other, but a gap is formed. As long as the size of the gap is smaller than the size of the third part so that the third part cannot pass through the gap, this situation can also be considered as an abutment fit in this application.

[0037] In one embodiment, an abutment portion 112 is introduced, which is formed by the side wall of the receiving groove 111 on the guide head 11. Figure 2As shown, a receiving groove 111 is provided on the guide head 11, and the receiving groove 111 can be a cylindrical groove or other shapes. The opening of the receiving groove 111 faces the second sheath core component 20, and the second sheath core component 20 slides relative to the first sheath core component 10 and can be at least partially inserted into the receiving groove 111 through the opening, so that the anchoring portion 211 abuts against the inner side wall of the receiving groove 111. In other words, the side wall of the receiving groove 111 forms an abutting portion 112, and the side wall of the receiving groove 111 abuts against the anchoring portion 211, so that the bare bracket 31 cannot pass between the side wall of the receiving groove 111 and the anchoring portion 211. In other words, as Figure 3 As shown, when the second sheath core assembly 20 is in the receiving groove 111, the anchoring portion 211 abuts against the side wall of the receiving groove 111 so as to hook the bare stent 31. Figure 4 The anchor portion 211 is shown to be hooked on the bare stent 31. On this basis, the anchor portion 211 is inserted into the receiving groove 111 through the opening. Figure 3 The conveying device consists of Figure 3 Transition to Figure 2 When the first sheath core assembly 10 is held stationary, the second sheath core assembly 20 is moved axially backward or downward in the direction shown, allowing the anchor portion 211 to be disengaged from the receiving groove 111 through the opening, thereby allowing the bare stent 31 hung or hooked on the anchor portion 211 to expand radially. Of course, the method of disengaging the anchor portion 211 from the receiving groove 111 through the opening can also be used to hold the second sheath core assembly 20 stationary while moving the first sheath core assembly 10 axially forward or upward in the direction shown.

[0038] Figure 5 This is a schematic diagram of the three-dimensional structure of the second sheath-core assembly 20 in one embodiment of the present application; Figure 6 Shown Figure 5 The expanded view of the side surface of the second sheath core assembly 20 is used to show the characteristics of the components on the side surface.

[0039] like Figure 5 and Figure 6 As shown, the second sheath core assembly 20 includes multiple groups of anchoring portions 211, which are staggered in the axial direction. In the process of relative sliding between the first sheath core assembly 10 and the second sheath core assembly 20 along the axial direction, the multiple groups of anchoring portions 211 can be separated from the abutting portions 112 one after another, that is, when one group of anchoring portions 211 is separated from the abutting portion 112, the other group of anchoring portions 211 is still abutted against the abutting portion 112, and continued relative sliding can cause both groups of anchoring portions 211 to be separated from the abutting portion 112.

[0040] Here, two groups of anchoring parts 211 are used as an example. The two groups of anchoring parts 211 are respectively the first anchoring part 211A and the second anchoring part 211B, and each group has two anchoring parts 211. Figure 5 and Figure 6 In the vertical direction, taking the projection of the anchoring portion 211 as a circle as an example, the staggered arrangement of the anchoring portion 211 in the axial direction can be these circles in Figure 6 The tops shown are axially offset. Figure 6 As can be seen in the figure, the tops of the two second anchoring portions 211B are on the same horizontal line, as are the tops of the two first anchoring portions 211A. However, these two horizontal lines are offset in the axial direction. In one embodiment, the distance between the tops of the first anchoring portion 211A and the second anchoring portion 211B can be 1.8 mm to 2 mm.

[0041] In one embodiment, Figure 5 and Figure 6 , still taking the projection of the anchoring portion 211 as a circle as an example, and taking the center of the circle as a reference, the staggered arrangement of the anchoring portion 211 in the axial direction can be such that the centers of the circles are staggered in the axial direction. Figure 6 As can be seen in FIG, the centers of the two second anchoring portions 211B are on the same horizontal line, and the centers of the two first anchoring portions 211A are on the same horizontal line.

[0042] Figure 7 This is an expanded view of the side surface of the second sheath core component 20 in another embodiment of the present application, and Figure 6 The difference is that the projection shapes of the two groups of anchoring parts 211 are different. In this embodiment, the staggered arrangement of the anchoring parts 211 in the axial direction can be understood as: Figure 6 In the perspective shown, the top of the first anchoring portion 211A and the top of the second anchoring portion 211B are staggered in the axial direction. In the perspective of use, it can be understood that the ends of the first anchoring portion 211A and the second anchoring portion 211B facing the first sheath core component 10 are staggered in the axial direction. Figure 7 The bottom ends of the two groups of anchoring portions 211 in the illustrated embodiment are flush, but in other embodiments, their bottom ends may not be flush.

[0043] In other embodiments, in the expanded view of the side surface, the shape of the projection of the anchoring portion 211 can also be other shapes. At this time, the axially staggered arrangement of multiple groups of anchoring portions 211 can be understood as the end portions of these anchoring portions 211 facing the first sheath core assembly 10 are axially staggered.

[0044] By arranging multiple groups of anchoring parts 211 in an axially staggered manner, Figure 3 The staggered arrangement in the vertical direction as shown makes different groups of anchoring parts 211 detach from the abutting parts 112 at different positions or times, so that the bare stents 31 hanging on different groups of anchoring parts 211 can expand at different times. Figure 3As shown, the end of the anchor portion 211 facing the first sheath core assembly 10 is when the anchor portion 211 and the abutment portion 112 are not in abutment with each other, specifically, the first anchor portion 211A and the second anchor portion 211B are in Figure 3 When the first sheath core assembly 10 is kept in place and the anchoring portion 211 is moved downward, the top end of the second anchoring portion 211B first disengages from the abutting portion 112. Therefore, the bare stent 31 hanging on the second anchoring portion 211B is no longer constrained and can expand radially. At this time, the first anchoring portion 211A still maintains abutment with the abutting portion 112. Continuing to move the anchoring portion 211 downward, the top end of the first anchoring portion 211A will disengage from the abutting portion 112. At this time, the bare stent 31 hanging on the first anchoring portion 211A is no longer constrained and can expand radially.

[0045] Figure 8 and Figure 9 Schematic diagram of the partial structure of the guide head 11 in two embodiments of the present application. The guide head 11 includes a guide portion 113 and an abutting portion 112 connected to the guide portion 113. The abutting portion 112 includes an abutting block 1121. The abutting block 1121 is a block-shaped structure connected to the guide portion 113. Figure 8 As shown, the abutting portion 112 includes four abutting blocks 1121, as shown in FIG. Figure 9 As shown, the abutment portion 112 includes two abutment blocks 1121. In other embodiments, the number of abutment blocks 1121 can also be three or more. The abutment blocks 1121 are used to abut against the anchoring portion 211 so that the anchoring portion 211 hooks or hangs the bare stent 31, wherein hooking and hanging have basically the same meaning, that is, limiting the bare stent 31 from passing between the abutment portion 112 and the anchoring portion 211. Figure 5 As shown, the surface of the anchor portion 211 includes a top surface 2111 and a side surface 2112. The abutting portion 112 or abutting block 1121 can abut against the top surface 2111 of the anchor portion 211, or against the side surface 2112 of the anchor portion 211. When these abutting blocks 1121 abut against the side surface 2112 of the anchor portion 211, these abutting blocks 1121 surround the outer periphery of the anchor portion 211 on the anchor member 21. Figure 8 and Figure 9 As shown, one abutment block 1121 can abut one anchor portion 211 or multiple anchor portions 211 , that is, the number of abutment blocks 1121 corresponds one-to-one to each group of anchor portions 211 , or one abutment block 1121 corresponds to at least one group of anchor portions 211 .

[0046] like Figure 2As shown, the second sheath core assembly 20 includes an anchor 21 and a second traction member 22. The second traction member 22 is connected to the anchor 21, and the anchor 21 can be driven to move by dragging or pushing the second traction member 22. The second traction member 22 can be an elongated tubular or filamentous structure, and its extension direction is roughly its axial direction. For example, when the second traction member 22 is a tubular structure, the second traction member 22 is sleeved on the outside of the first traction member 12, and the front end of the first traction member 12 extends from the front end of the second traction member 22, and the front end of the first traction member 12 is connected to the guide head 11. During the operation, the guide head 11 and the anchor 21 are located in the blood vessel, and the ends of the first traction member 12 and the second traction member 22 for operation are located outside the blood vessel, so as to facilitate operation. By operating the first traction member 12 and the second traction member 22 to slide relative to each other along their axial directions, the anchor 21 and the guide head 11 located in the blood vessel can be driven to slide relative to each other, thereby controlling whether the bare stent 31 is released and expanded. As shown Figure 2 As shown, the anchoring member 21 includes an anchoring portion 211, which is a plurality of block structures protruding radially outward. Figure 2 In the embodiment shown, the anchoring portion 211 is roughly in the shape of a flat cylinder. In other embodiments, it can also be in the shape of a hook or other shapes so that the anchoring portion 211 can hook or hang the bare stent 31.

[0047] like Figure 5 and Figure 6 As shown, the anchoring portion 211 includes a first anchoring portion 211A and a second anchoring portion 211B. The first anchoring portion 211A and the second anchoring portion 211B are staggered in the axial direction. Figure 6 In the figure, from left to right are the second anchoring portion 211B, the first anchoring portion 211A, another second anchoring portion 211B and another first anchoring portion 211A. These four anchoring portions 211 are staggered in the vertical direction, presenting a wave-like up and down arrangement.

[0048] In other embodiments, the arrangement of the plurality of anchoring portions 211 may be such that the minimum axial distances between the first anchoring portion 211A and the second anchoring portion 211B and one end of the anchor 21 are different. Since the outer contours of the anchoring portions 211 may be curved, the minimum axial distance between each anchoring portion 211 and one end of the anchor 21 is used as a reference to clearly define the arrangement of the anchoring portions 211.

[0049] In one embodiment, there are multiple first anchoring portions 211A, and at least two first anchoring portions 211A are symmetrically distributed in the radial direction of the anchor member 21 .

[0050] In one embodiment, there are multiple second anchoring portions 211B, and at least two second anchoring portions 211B are symmetrically distributed in the radial direction of the anchor member 21 .

[0051] In one embodiment, there are two first anchoring portions 211A and two second anchoring portions 211B, the two first anchoring portions 211A are symmetrically distributed in the radial direction of the anchor 21, and the two second anchoring portions 211B are symmetrically distributed in the radial direction of the anchor 21. In the axial projection of the anchor 21, the four anchoring portions 211 can be located at four equally divided points of the circumference.

[0052] Figure 10 The figure is a schematic structural diagram of a bare stent 31 of a main stent 32 in an embodiment being hung on the anchor portion 211 of a conveying device. The anchor portion 211 in the figure includes a first anchor portion 211A and an adjacent second anchor portion 211B. The two anchor portions 211 are staggered in the axial direction of the anchor 21. The highest point of the first anchor portion 211A in the axial direction of the anchor 21 is higher than the highest point of the second anchor portion 211B in the axial direction of the anchor 21. The stent includes a main stent 32 and a first bare stent 31A and a second bare stent 31B connected to the main stent 32. The first bare stent 31A is hung on the first anchor portion 211A, and the second bare stent 31B is hung on the second anchor portion 211B. A limiting groove 212 is also provided on the anchor 21 for accommodating the bare stent 31. The bare bracket 31 is in a closed loop shape. The bare bracket 31 passes through the limiting groove 212 and is hooked on the anchoring part 211. When it is hung on the anchoring part 211, the two ends of the bare bracket 31 extend downward and are respectively passed through the limiting groove 212. The limiting groove 212 is used to limit the circumferential displacement of the bare bracket 31 on the anchoring part 211.

[0053] In some embodiments, the limiting groove 212 can be formed by being concave on the circumferential side surface of the anchor 21 , or can be formed by being spaced apart by at least two protrusions on the circumferential side surface of the anchor 21 .

[0054] For example, Figure 10 In the embodiment, the anchor 21 includes at least two limiting blocks 213 spaced apart in the circumferential direction of the anchor 21, and a limiting groove 212 is formed between the two limiting blocks 213. The sizes and shapes of these limiting blocks 213 can be the same or different. Figure 10 In the embodiment, the cross section of the limiting block 213 is rectangular, and may also be circular, triangular or other shapes.

[0055] In one embodiment, the limit block 213 not only limits the circumferential displacement of the bare stent 31, but also serves to position the guide head 11. That is, the limit block 213 has a limiting state against the first sheath core component 10. In the limiting state, the anchor portion 211 can hook the bare stent 31, and the limit block 213 limits the relative sliding of the first sheath core component 10 and the second sheath core component 20 in at least one axial direction. Figure 3As shown, in the limited state, the lower end of the guide head 11 of the first sheath core component 10 is held against the limit block 213, so the first sheath core component 10 and the second sheath core component 20 cannot continue to slide in the direction of approaching each other, but can slide in the direction of moving away from each other. Figure 3 In the embodiment, the movement of the first sheath core assembly 10 and the second sheath core assembly 20 in a direction of approaching each other means that at least one of the first sheath core assembly 10 and the second sheath core assembly 20 is moving, and the movement is specifically the first sheath core assembly 10 moving downward and / or the second sheath core assembly 20 moving upward; the movement of the first sheath core assembly 10 and the second sheath core assembly 20 in a direction of moving away from each other means that at least one of the first sheath core assembly 10 and the second sheath core assembly 20 is moving, and the movement is specifically the first sheath core assembly 10 moving upward and / or the second sheath core assembly 20 moving downward. By positioning the guide head 11 through the limit block 213, the state of the anchor portion 211 and the abutment portion 112 in abutment can be controlled, and it can also be used to indicate whether the anchor portion 211 and the abutment portion 112 have achieved complete abutment. Wherein, complete abutment means that all the anchor portions 211 are in abutment with the abutment portion 112.

[0056] like Figure 5 As shown, the stoppers 213 have at least two shapes, which are alternately arranged in a circumferential direction of the anchor member 21. Specifically, the stoppers 213 include first stoppers 213A and second stoppers 213B of different shapes. The first stoppers 213A and second stoppers 213B are alternately arranged in a circumferential direction of the anchor member 21. The first stoppers 213A and second stoppers 213B both serve to position the guide head, i.e., the first stoppers 213A and second stoppers 213B both have a positional state against the first sheath core assembly 10. The first limiting block 213A further includes a positioning portion 2131 and a limiting portion 2132. The positioning portion 2131 and the limiting portion 2132 form a high-low offset structure in the radial direction. The limiting portion 2132 is higher than the positioning portion 2131. The limiting portion 2132 has the same shape as the first limiting block 213A. The limiting portion 2132 is used to support the first sheath core assembly 10 in the axial direction. In the above-mentioned high-low offset structure, the positioning portion 2131 is lower than the limiting portion 2132 in the radial direction. Figure 3 In the limited state, the limiting portion 2132 abuts against the end of the first sheath core assembly 10, and the positioning portion 2131 extends into the accommodating groove 111 and is supported on the inner wall of the accommodating groove 111, thereby playing a role in circumferential positioning of the first sheath core assembly 10.

[0057] like Figure 10As shown, the anchor 21 further includes a limiting member 214, which is spaced apart from the anchor portion 211. The limiting member 214 is located above the anchor portion 211. When the bare stent 31 is hung on the anchor portion 211, the bare stent 31 passes through the space between the limiting member 214 and the anchor portion 211. In other words, Figure 10 In the figure, the second anchoring portion 211B limits the second bare bracket 31B from moving downward, and the limiting member 214 limits the second bare bracket 31B from moving upward, so that the second bare bracket 31B and the anchoring member 21 are more closely matched.

[0058] In one embodiment, Figure 2 As shown, the delivery device also includes a sheath assembly 40. The first sheath-core assembly 10, the second sheath-core assembly 20, and the stent can all be compressed within the sheath assembly 40. Under the constraints of the sheath assembly 40, the stent can move within the blood vessel with a smaller diameter. After reaching the target location in the blood vessel, the stent is extended from the sheath assembly 40 by operating the sheath-core assembly, and the stent can expand radially to a certain extent. The further expansion of the stent can then be controlled by operating the sheath-core assembly.

[0059] The sheath assembly 40 includes a support tube 42 and an outer sheath 41 coaxially sleeved from the inside to the outside. The stent can extend into the outer sheath 41 and abut against the support tube 42. During installation, the stent is first compressed radially and inserted into the inner cavity of the outer sheath 41. The support tube 42 is located in the inner cavity of the outer sheath 41. One end of the stent in the inner cavity of the outer sheath 41 can abut against the end of the support tube 42, so that the support tube 42 limits the stent in the axial direction. When releasing, the first sheath core assembly 10 and the second sheath core assembly 20 can be kept stationary, and the outer sheath 41 can be slid backward to allow the stent to extend from the front end of the outer sheath 41.

[0060] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A conveying device, characterized in that: Used for delivering and releasing a stent with a bare stent, the delivery device comprises: a first sheath-core assembly, and The second sheath core component is axially connected to the first sheath core component. The second sheath core component includes multiple groups of anchoring parts for hooking different bare stents. The second sheath core component slides relative to the first sheath core component and cooperates with the first sheath core component to enable multiple groups of anchoring parts to release the hooked bare stents in turn.

2. The conveying device according to claim 1, characterized in that The first sheath-core assembly includes a guide head and a first pulling member, wherein the first pulling member is connected to the guide head so that the guide head slides axially relative to the second sheath-core assembly.

3. The conveying device according to claim 2, characterized in that The guide head includes an abutment portion; The plurality of anchoring portions hook the bare stent when in contact with the abutting portion, so that the bare stent is in a radially restrained state; The multiple groups of anchoring parts are used to successively disengage from the abutting parts and successively release the corresponding hooked bare brackets.

4. The conveying device according to claim 3, characterized in that The guide head is provided with a receiving groove, and the side wall of the receiving groove forms the abutting portion; The second sheath-core assembly is at least partially capable of entering and exiting the accommodating groove; When the second sheath core assembly is in the accommodating groove, the anchoring portion abuts against the side wall of the accommodating groove to hook the bare stent.

5. The conveying device according to claim 4, characterized in that The plurality of anchoring portions are staggered in the axial direction and can be separated from the abutting portion one after another during the relative sliding of the first sheath-core component and the second sheath-core component along the axial direction.

6. The conveying device according to claim 3, characterized in that The abutting portion includes an abutting block, and the anchoring portion abuts against the abutting block so that the anchoring portion hooks the bare stent.

7. The conveying device according to claim 6, characterized in that The number of the abutment blocks corresponds one to one with each group of the anchoring portions, or One abutting block corresponds to at least one group of anchoring portions.

8. The conveying device according to claim 1, characterized in that The second sheath-core assembly includes an anchor and a second pulling member, wherein the second pulling member is connected to the anchor so that the anchor slides axially relative to the first sheath-core assembly; The anchor member includes the anchor portion.

9. The conveying device according to claim 8, characterized in that The anchoring portion includes a first anchoring portion and a second anchoring portion, wherein the first anchoring portion and the second anchoring portion are staggered in the axial direction; Alternatively, the first anchoring portion and the second anchoring portion have different minimum distances from one end of the anchoring member in the axial direction.

10. The conveying device according to claim 9, characterized in that There are multiple first anchoring parts, and at least two of them are symmetrically distributed in the radial direction; there are multiple second anchoring parts, and at least two of them are symmetrically distributed in the radial direction.

11. The conveying device according to claim 8, characterized in that The anchoring member is provided with a limiting groove for accommodating the bare stent, and the limiting groove is used to limit the displacement of the bare stent in the circumferential direction of the anchoring portion; the bare stent passes through the limiting groove and is hooked on the anchoring portion.

12. The conveying device according to claim 11, characterized in that The anchoring member includes at least two limiting blocks spaced apart in the circumferential direction of the anchoring member, and the limiting groove is formed between the two limiting blocks.

13. The conveying device according to claim 8, characterized in that The anchoring member includes a limiting block, and the limiting block has a limiting state of abutting against the first sheath-core assembly; In the limiting state, the limiting block limits the relative sliding of the first sheath-core component and the second sheath-core component in at least one axial direction; In the limiting state, the anchoring portion can hook the bare stent.

14. The conveying device according to claim 13, characterized in that The limit block includes a first limit block and a second limit block of different shapes. In the circumferential direction of the anchor, the first limit block and the second limit block are alternately arranged at intervals. The first limit block includes a positioning portion and a limiting portion. The positioning portion and the limiting portion form a high and low staggered structure in the radial direction. The limiting portion is higher than the positioning portion. The limiting portion is used to support the second sheath core assembly in the axial direction, and the positioning portion is used to support the second sheath core assembly in the radial direction.

15. The conveying device according to claim 8, characterized in that The anchor also includes a limiting member, which is spaced apart from the anchor portion. The limiting member is located above the anchor portion. When the bare stent is hung on the anchor portion, the bare stent passes through the space between the limiting member and the anchor portion.

16. The conveying device according to claim 1, characterized in that The delivery device includes a sheath tube assembly, which includes a support tube and an outer sheath tube coaxially sleeved from the inside to the outside. The stent can extend into the outer sheath tube and abut against the support tube.

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