Conveying system

Abstract

The utility model relates to the technical field of medical instruments, and provides a conveying system which comprises a shell, a finger wheel, a transmission mechanism, a catheter assembly and an intravascular stent. Part of the finger wheel and the transmission mechanism are arranged in the shell, the finger wheel is connected with the transmission mechanism, part of the catheter assembly extends out of the shell, the transmission mechanism is connected with the catheter assembly, and the catheter assembly is used for conveying an intravascular stent; when the finger wheel rotates, the transmission mechanism can be driven to act, and then the catheter assembly is driven to move to release the intravascular stent. The intravascular stent comprises a stent body, and the diameter of the stent body is gradually reduced or gradually reduced in the extension direction of the length of the stent body. According to the conveying system, the stent body is arranged to be in the hollow circular truncated cone shape or the stepped barrel shape, the conveying system can adapt to blood vessel physiological deformation with unequal diameters and taper, blood vessels can be effectively expanded and well attached to the wall, damage caused by excessive expansion to the blood vessels is avoided, and the treatment effect is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a delivery system. Background Technology

[0002] Based on the different expansion mechanisms used during stent placement, stent expansion methods can be divided into balloon-expandable and self-expanding types. Balloon-expandable stents involve pre-pressing a laser-engraved vascular stent onto a balloon, which then travels along the guiding catheter to the lesion site. The balloon then inflates to expand the stent and open the narrowed blood vessel. However, this type of stent is prone to elastic recoil after unloading and cannot meet the needs of some special blood vessel shapes.

[0003] Self-expanding stent intervention first involves heat-treating and shaping the stent outside the body. The stent is then crimped into a delivery catheter. Once the stent reaches the patient's diseased blood vessel, it is ejected from the delivery catheter and automatically returns to its original shape, opening up the narrowed vessel and restoring blood flow. This self-expanding stent causes less damage to the vessel wall, and the residual elasticity after expansion ensures the stent remains firmly attached to the vessel wall, making it suitable for complex-shaped lesions.

[0004] Clinically, cylindrical metal stents with the same lumen diameter at both proximal and distal ends are commonly used. However, the shape of human blood vessels varies greatly. For example, the inner diameter of some arteries, such as the carotid artery, femoral artery, and the left anterior descending branch of the coronary artery, gradually decreases along the axial direction, forming a cone shape. In such cases, if a conventional stent is used to dilate the cone-shaped vessel, and the dilation diameter is based on the distal diameter of the cone-shaped vessel, the proximal end of the dilated stent will be suspended within the vessel, leading to severe proximal stent apposition failure and increasing the incidence of longitudinal stent deformation. Conversely, if the dilation diameter is based on the proximal diameter of the cone-shaped vessel, the distal end of the vessel will be over-dilated, causing inflammatory reactions and intimal cell proliferation, resulting in in-stent restenosis. Therefore, providing a new type of vascular stent has become an urgent problem to be solved in the industry. Utility Model Content

[0005] This invention provides a delivery system to address the shortcomings of existing technologies where vascular stents do not match the shape of blood vessels.

[0006] This utility model provides a delivery system, characterized in that it includes: a housing, a finger wheel, a transmission mechanism, a catheter assembly, and a vascular stent; a portion of the finger wheel and the transmission mechanism are disposed within the housing, the finger wheel is connected to the transmission mechanism, a portion of the catheter assembly extends outside the housing, the transmission mechanism is connected to the catheter assembly, and the catheter assembly is used to deliver the vascular stent; when the finger wheel rotates, it can drive the transmission mechanism to move, thereby driving the catheter assembly to move and release the vascular stent; wherein, the vascular stent includes a stent body, the diameter of which gradually decreases along its length, or decreases segment by segment.

[0007] According to the present invention, a delivery system includes an inner catheter and an outer catheter. The outer catheter is sleeved outside the inner catheter. The first ends of the inner catheter and the outer catheter are connected to the housing. The second end of the outer catheter extends beyond the second end of the inner catheter. The vascular stent is disposed inside the second end of the outer catheter. The first end of the outer catheter is connected to the transmission mechanism. When the transmission mechanism is activated, it can drive the second end of the outer catheter to move towards the transmission mechanism to release the vascular stent.

[0008] According to the present invention, a delivery system is provided, wherein the inner catheter includes a first inner catheter and a second inner catheter, the first inner catheter and the second inner catheter are detachably connected, and the first inner catheter is connected to the housing; the outer catheter includes a first outer catheter and a second outer catheter, the first outer catheter and the second outer catheter are detachably connected, the first outer catheter is connected to the transmission mechanism, and the vascular stent is disposed inside the second outer catheter.

[0009] According to the present invention, a conveying system further includes a ratchet mechanism, which is coaxially arranged with the finger wheel. When the finger wheel rotates in a set direction, it can drive the ratchet mechanism to rotate. The ratchet mechanism includes a ratchet ring and a ratchet. The ratchet ring is disposed in the housing. The ratchet is coaxially arranged with the finger wheel. The ratchet includes a wheel body and a plurality of pawls. The wheel body is coaxially arranged with the finger wheel. The plurality of pawls are arranged in a ring along the circumference of the wheel body. Each pawl includes a bent portion and a toothed portion. The toothed portion is connected to the wheel body through the bent portion and engages with the ratchet ring. The bent portion is an elastically bent portion.

[0010] According to the present invention, the support body of the conveying system meets at least one of the following requirements: (1) the diameter gradient difference between the two ends of the support body is 0.5mm-4.0mm; (2) the diameter ratio between the minimum diameter and the maximum diameter of the support body is in the range of 1:1.0.1 to 1:1.8; (3) the taper of the support body is 0.02-0.05; (4) the length of the support body is 20mm-200mm; (5) the diameter of the minimum diameter end of the support body is 3mm-12mm.

[0011] According to the present invention, a conveying system includes a support body comprising: a plurality of annular supports and a plurality of connecting bodies. The annular supports are shape memory alloy annular supports. The plurality of annular supports are arranged sequentially along the extension direction of the length of the support body, and adjacent annular supports are connected by a set of connecting bodies. The diameters of the plurality of annular supports decrease sequentially along the extension direction of the length of the support body.

[0012] According to the present invention, a conveying system is provided at both ends of the support body, wherein developing rings are provided at the two ends of the supporting body, and developing points are provided at the developing rings.

[0013] According to the conveying system provided by this utility model, when the support body is conical, the developing ring is provided in the middle of the support body; when the support body is stepped, the developing ring is provided at the diameter change point of the support body.

[0014] According to the present invention, a delivery system is provided in which the surface of the stent body is coated with a drug and / or the surface of the stent body is provided with a film.

[0015] The delivery system provided by this utility model, by setting the stent body into a hollow frustum or stepped cylindrical shape, can adapt to the physiological course of blood vessels with different diameters and tapers, effectively dilate blood vessels, and adhere well to the wall without causing excessive expansion damage to blood vessels, thus ensuring the therapeutic effect. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a front view of the vascular stent provided by this utility model.

[0018] Figure 2This is an unfolded diagram of the vascular stent provided by this utility model.

[0019] Figure 3 This is one of the schematic diagrams of the vascular stent provided by this utility model.

[0020] Figure 4 This is the second schematic diagram of the vascular stent provided by this utility model.

[0021] Figure 5 This is a schematic diagram of the vascular stent provided by this utility model applied in blood vessels.

[0022] Figure 6 This is a schematic diagram of the conveying system provided by this utility model.

[0023] Figure 7 for Figure 6 A cross-sectional view along line AA.

[0024] Figure 8 for Figure 6 The cross-sectional view of the handle is shown in the figure.

[0025] Figure 9 for Figure 6 The exploded view of a portion of the handle is shown in the image.

[0026] Figure 10 for Figure 9 The diagram shows the structure of a ratchet.

[0027] Figure 11 for Figure 6 The enlarged cross-sectional view at C1 is shown in the figure.

[0028] Figure 12 This is one of the structural diagrams of vascular stents, inner catheters, and outer catheters.

[0029] Figure 13 This is the second schematic diagram of the structure of a vascular stent, inner catheter, and outer catheter.

[0030] Figure 14 for Figure 6 The enlarged cross-sectional view at point C2 is shown in the figure.

[0031] Figure 15 for Figure 8 The enlarged view of point C3 shown in the image.

[0032] Figure 16 for Figure 8 The enlarged view of C4 shown in the image.

[0033] Figure 17 for Figure 16 The enlarged view of C5 shown in the image.

[0034] Figure label:

[0035] 100. Support body; 101. Annular support; 102. Connector; 110. Development point;

[0036] 210. Conduit assembly; 211. Inner conduit; 212. Outer conduit; 213. Intermediate tube; 214. Protective tube; 220. Handle; 221. Housing; 222. Finger wheel; 223. Rotating shaft; 224. Needle seat; 230. Transmission mechanism; 231. Slider; 232. Thread wheel; 233. Pull rope; 234. Arc plate; 235. Guide plate; 240. Ratchet mechanism; 241. Ratchet ring; 242. Ratchet; 250. Annular rubber sleeve; 260. Locking cover; 270. Outer track tube; 280. Flexible sleeve; 290. Inner track tube;

[0037] 301. Artificial blood vessel; 302. Venous anastomosis; 311. Right brachiocephalic artery; 312. Right subclavian artery; 321. Left brachiocephalic artery; 322. Left subclavian artery;

[0038] 2111, First inner catheter; 2112, Second inner catheter; 2121, First outer catheter; 2122, Second outer catheter; 2421, Wheel body; 2422, Pawl; 24221, Bend; 24222, Tooth. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0040] The following is combined Figures 1-17 This invention describes the conveying system of the present invention.

[0041] like Figure 1 As shown, in an embodiment of this utility model, the vascular stent includes a stent body 100, and the diameter of the stent body 100 gradually decreases or the diameter decreases segment by segment along its own length extension direction.

[0042] Specifically, such as Figure 3 and Figure 4As shown, the stent body 100 can be conical or stepped, so that its shape matches the shape of the conical or unequal-diameter blood vessel. When the stent body 100 is placed in the blood vessel, the larger diameter end of the stent body 100 fits against the larger diameter part of the blood vessel, and the smaller diameter end fits against the smaller diameter part of the blood vessel, so that the stent body 100 fits completely against the blood vessel.

[0043] Specifically, such as Figure 5 (a) illustrates the placement of a vascular stent at the anastomosis between a vein and an artificial blood vessel. The artificial blood vessel 301 is connected to an artery and a vein at its two ends, respectively. However, over time, stenosis can easily occur at the anastomosis due to thrombus buildup. The vein has a different diameter than the artificial blood vessel 301. To prevent anastomotic leakage at the artificial blood vessel 301 anastomosis, a vascular stent is placed at the anastomosis between the vein anastomosis 302 and the artificial blood vessel 301 to prevent anastomotic stenosis.

[0044] The aorta is the main artery of the systemic circulation. It originates from the left ventricle, ascends to the right front of the pulmonary artery, and at the level of the second costal joint on the right side, curves to the left rear, reaching the left side of the lower border of the fourth thoracic vertebra, before descending again. The aortic arch is the curved section of the ascending aorta. Three major arteries emerge from the convex side of the aortic arch: from right to left, the brachiocephalic trunk (brachial artery), the left common carotid artery, and the left subclavian artery 322. The brachiocephalic artery ascends and branches into the right common carotid artery and the right subclavian artery 312. The left and right common carotid arteries ascend through the neck to supply blood to the head, while the left and right subclavian arteries 322 and 312 pass through the clavicle to supply blood to the left and right upper limbs. These areas are prone to aortic dissection. After aortic dissection forms, the hematoma ruptures, and the bleeding can enter the pericardium, causing acute cardiac tamponade, which is life-threatening. Even if the hematoma does not rupture, it can still compress nearby blood vessels, leading to myocardial infarction by compressing the coronary arteries, or causing ischemia in other end organs by compressing other blood vessels, subsequently leading to various ischemic diseases and even organ failure. The right (left) brachiocephalic artery and the right (left) subclavian artery have different diameters. Figure 5 (b) The case where a vascular stent is placed in the right subclavian artery 312 and the right brachiocephalic artery 311. Figure 5 (c) is the case where a vascular stent is placed in the left subclavian artery 322 and the left brachiocephalic artery 321.

[0045] Depend on Figure 5 (a) Figure 5 (b) and Figure 5 (c) It can be seen that the vascular stent provided by the present invention can be adapted to vascular sites with varying diameters and can be well anastomosed with the blood vessels.

[0046] The vascular stent provided in this embodiment of the invention is a hollow frustum or stepped cylindrical shape, which can adapt to the physiological course of blood vessels with different diameters and tapers, effectively dilate blood vessels, and adhere well to the vessel wall without causing excessive expansion damage to the blood vessels, thus ensuring the therapeutic effect.

[0047] In the embodiments of this utility model, the diameter gradient difference between the larger and smaller diameter ends of the support body 100 is 0.5mm-4.0mm; the diameter ratio between the smaller and larger diameter ends of the support body 100 is 1:1.01-1:1.8; the taper of the support body 100 is 0.02-0.05; the length of the support body 100 is 20mm-200mm; and the diameter of the larger diameter end of the support body 100 is 3mm-20mm.

[0048] like Figure 3 and Figure 4 As shown, in an embodiment of this utility model, the support body 100 has developing rings at both ends, and developing points 110 are provided on the developing rings. When the support body 100 is conical, a developing ring is also provided in the middle of the support body 100; when the support body 100 is stepped, a developing ring is provided at the point where its diameter changes. In an embodiment of this utility model, the material of the developing points 110 can be, but is not limited to, one or more of platinum, gold, tantalum, or tungsten.

[0049] In the embodiments of this utility model, the support body 100 is made of shape memory alloy by laser engraving. The material of the support body 100 can be, but is not limited to, nickel-titanium alloy, nickel-titanium-copper alloy, or platinum-titanium alloy.

[0050] like Figure 2 As shown, in an embodiment of the present invention, the support body 100 includes: a plurality of annular supports 101 and a plurality of connecting bodies 102. The plurality of annular supports 101 are arranged sequentially along the extension direction of the length of the support body 100. Adjacent annular supports 101 are connected by a set of connecting bodies 102. Along the extension direction of the length of the support body 100, the diameter of the plurality of annular supports 101 decreases sequentially.

[0051] Specifically, in this embodiment, the annular support 101 is a shape memory alloy annular support, which expands itself after being placed in a blood vessel to expand the vessel. In this embodiment, multiple annular supports 101 are connected by connectors 102 to form a stent body 100.

[0052] like Figure 2As shown, in an embodiment of this utility model, each annular support 101 has a sinusoidal structure, with two adjacent sinusoidal structures arranged symmetrically. The two ends of each set of connectors 102 are connected to the peaks of two sinusoidal structures, respectively. In this embodiment, each set of connectors 102 includes multiple connectors 102, and each connector 102 is linear.

[0053] Along the length of the support body 100, the wave height H of the multiple sinusoidal wave structures gradually decreases. Along the direction from the smallest end to the largest end of the diameter of the support body 100, the wave height H forms a geometric sequence with a common ratio of 1.0-1.3.

[0054] The vascular stent provided in this embodiment of the invention has a wave height H of multiple sinusoidal structures that gradually decreases, so that the inner diameter of the annular support after restoration gradually decreases along the extension direction of the length of the vascular stent, in order to adapt to the shape of a conical blood vessel.

[0055] Along the length of the stent body 100, the rib width W of each annular support 101 is equal. Along the length of the stent body 100, the length L and width B of the multiple sets of connectors 102 decrease sequentially. Along the direction from the smallest to the largest diameter of the stent body 100, the lengths L of the multiple sets of connectors 102 form a geometric progression with a common ratio of 1.0-1.2, and the widths B of the multiple sets of connectors 102 form a geometric progression with a common ratio of 1.1-1.3. In this embodiment, as the diameter of the annular support 101 decreases, the length of the connector 102 becomes shorter to ensure sufficient contact between the vascular stent and the vessel wall, thereby improving the metal coverage of the vessel wall surface.

[0056] In other embodiments of this utility model, each annular support 101 may also be in the form of a cosine wave structure, a sawtooth wave, or other wave types.

[0057] In embodiments of this invention, the surface of the stent body 100 is coated with an anticoagulant coating, which is, but is not limited to, a combination of one or more of heparin coating, phosphocholine coating, peptide coating, and nano-coating. The surface of the stent body 100 is coated with a drug, which may be, but is not limited to, one or more of rapamycin and its derivatives, paclitaxel and its derivatives, heparin, hirudin, prostacyclin, abciximab, dexamethasone, mometasone furoate, and liposomes containing bisphosphate.

[0058] The surface of the stent body 100 is covered with a single-layer film, one end of which covers at least a portion of the inner surface or at least a portion of the outer surface of the stent body 100. One end of the film is bonded, sewn, or thermally fused to the stent body 100.

[0059] Furthermore, the surface of the stent body 100 can be coated with an anti-coating coating while simultaneously being covered with a film.

[0060] like Figure 6 As shown in the figure, this utility model embodiment also provides a vascular stent delivery system, including: a housing 221, a finger wheel 222, a transmission mechanism 230, and a catheter assembly 210. A portion of the finger wheel 222 and the transmission mechanism 230 are disposed within the housing 221, with the finger wheel 222 connected to the transmission mechanism 230. A portion of the catheter assembly 210 extends outside the housing 221, and the transmission mechanism 230 is connected to the catheter assembly 210. The catheter assembly 210 is used to deliver the vascular stent. When the finger wheel 222 rotates, it can drive the transmission mechanism 230 to move, thereby moving the catheter assembly 210 to release the vascular stent.

[0061] In the embodiments of this utility model, for ease of description, the terms "distal" and "proximal" are introduced from the operator's perspective. "Distal" refers to the end furthest from the operator when using the delivery system, while "proximal" refers to the end closest to the operator. "Distal" and "proximal" are defined merely for ease of description and are not restrictive. In this embodiment, the vascular stent is made of, but is not limited to, nickel-titanium shape memory alloy or cobalt-chromium shape memory alloy, which possesses good tissue compatibility, flexibility, and stability. Upon release, it self-expands, allowing for early placement to open narrowed or occluded arteries, preventing restenosis after simple balloon dilation, and improving the success rate of interventional treatment.

[0062] Specifically, such as Figure 7 As shown, the delivery system includes a handle 220, which includes a housing 221. The housing 221 is shaped to be easily gripped by the operator, such as a knife handle. To facilitate the assembly of other structures within the housing 221, the housing 221 can be a split structure, such as being composed of two half-shells joined together. To enable the rotatable mounting of the finger wheel 222, the handle 220 also includes a pivot 223, which is rotatably disposed within the housing 221. The pivot 223 is used to fix the finger wheel 222, and the pivot 223 and the finger wheel 222 can be linked by a keyed connection or a spline connection. The position of the pivot 223 is chosen to partially expose the finger wheel 222 outside the housing 221, so that the operator can rotate it while gripping the housing 221. To ensure that the finger wheel 222 can effectively control the catheter assembly 210, the handle 220 also includes a transmission mechanism 230 that connects the finger wheel 222 and the catheter assembly 210. The finger wheel 222 can control the catheter assembly 210 to release the vascular stent through the transmission mechanism 230.

[0063] During use, when the vascular stent is delivered to the designated location within the blood vessel (e.g., a narrowed area), the operator holds the handle 220 and rotates the finger wheel 222 in a selected direction (e.g., clockwise) with their thumb. The rotation of the finger wheel 222 drives the transmission mechanism 230 to manipulate the catheter assembly 210 to release the vascular stent. Then, the vascular stent, due to the properties of the shape memory alloy, undergoes radial expansion, enlarging and supporting the designated location of the blood vessel to improve blood circulation and achieve the therapeutic purpose.

[0064] The delivery system provided in this embodiment of the utility model, by setting up a housing, a finger wheel, a transmission mechanism and a catheter assembly, can use the catheter assembly to deliver the vascular stent to the target position. By turning the finger wheel, the vascular stent can be released from the catheter assembly to the target position. After the vascular stent reaches the target position, it expands and returns to a conical shape on its own, which effectively improves the problem of poor wall adhesion caused by the elastic recoil of balloon-expandable stents.

[0065] To avoid the risk of the vascular stent being misplaced due to the operator applying reverse operation (such as counterclockwise rotation) to the finger wheel 222, the delivery system provided in this embodiment of the utility model also includes a ratchet mechanism 240. Figure 6 As shown, the ratchet mechanism 240 is disposed within the housing 221. The delivery system can utilize the ratchet mechanism 240 to prevent the finger wheel 222 from rotating in the opposite direction (e.g., counterclockwise rotation), so that the finger wheel 222 can only rotate in the selected direction and, through the transmission mechanism 230, manipulate the catheter assembly 210 to release the vascular stent. In this case, even if the operator applies a reverse operation to the finger wheel 222, the ratchet mechanism 240 can prevent the finger wheel 222 from rotating in the opposite direction (i.e., reversing), thus effectively preventing damage to the internal structure of the handle 220, especially the transmission mechanism 230, due to reverse operation, ensuring the normal use of the delivery system, and not increasing the risk of improper placement of the vascular stent.

[0066] like Figure 9 and Figure 10 As shown, the ratchet mechanism 240 includes a ratchet ring 241 fixedly disposed on the inner wall of the housing 221, and a ratchet 242 fixed on the rotating shaft 223 and meshing with the ratchet ring 241 within the ratchet ring 241. The ratchet 242 includes a wheel body 2421 and a plurality of pawls 2422. The wheel body 2421 is sleeved on the outside of the rotating shaft 223, and the plurality of pawls 2422 are arranged in a ring along the circumference of the wheel body 2421. Each pawl 2422 includes a bent portion 24221 and a toothed portion 24222. The toothed portion 24222 is connected to the wheel body 2421 through the bent portion 24221, and the toothed portion 24222 meshes with the ratchet ring 241. The bent portion 24221 is an elastically bent portion.

[0067] When a reverse operation is applied to the finger wheel 222, the pawl 2422 of the ratchet 242 engages with the ratchet teeth of the ratchet ring 241, preventing the ratchet 242 from rotating within the ratchet ring 241. This effectively prevents the finger wheel 222 from rotating in the reverse direction. However, when a forward operation is applied to the finger wheel 222, the pawl 2422 of the ratchet 242 can elastically deform and slide under the action of the ratchet teeth of the ratchet ring 241, allowing the ratchet 242 to rotate within the ratchet ring 241. This allows the finger wheel 222 to rotate in the selected direction (such as clockwise) to ensure that the finger wheel 222 can trigger the catheter assembly 210 to release the vascular stent.

[0068] like Figure 11 As shown, the catheter assembly 210 includes an inner catheter 211 and an outer catheter 212 sleeved outside the inner catheter 211. Wherein, as... Figure 12 and Figure 13 As shown, the inner catheter 211 is divided into a first inner catheter 2111 and a second inner catheter 2112, and the outer catheter 212 is divided into a first outer catheter 2121 and a second outer catheter 2122. A vascular stent is fitted onto the distal end of the second inner catheter 2112, while the proximal end of the first inner catheter 2111 is used for fixation within the housing 221. To achieve fixation of the proximal end of the inner catheter 211 within the housing 221, the handle 220 may further include a needle hub 224 disposed within the proximal end of the housing 221 for fixing the proximal end of the inner catheter 211. See [reference needed]. Figure 8 The distal end of the second external catheter 2122 is used to cover the vascular stent, while the proximal end of the first external catheter 2121 is inserted into the housing 221 and connected to the transmission mechanism 230. The distal end of the first internal catheter 2111 is detachably connected to one end of the second internal catheter 2112, and the distal end of the first external catheter 2121 is detachably connected to one end of the second external catheter 2122. The detachable connection can be any of the following: threaded connection, snap-fit ​​connection, interference fit, groove and protrusion engagement, or hook connection. When releasing the vascular stent, the finger wheel 222 needs to be turned, and the external catheter 212 is pulled on the internal catheter 211 towards the proximal end of the internal catheter 211, so that the vascular stent is exposed outside the distal end of the external catheter 212.

[0069] In this embodiment, as Figure 12 and Figure 13 As shown, both the inner catheter 211 and the outer catheter 212 are detachable, allowing the two ends of the vascular stent to be interchanged and connected to the delivery system. This enables flexible interchange of the two ends of the vascular stent according to the shape of the blood vessel, eliminating the need for two vascular stents and delivery systems. During installation, the second outer catheter 2122 is directly connected to the first outer catheter 2121, and the second inner catheter 2112 is connected to the first inner catheter 2111, making installation convenient.

[0070] When releasing the vascular stent, the finger wheel 222 pulls the first external catheter 2121 and moves the second external catheter 2122 on the internal catheter 211 toward the proximal end of the first internal catheter 2111, so that the vascular stent is exposed outside the second external catheter 2122. The release method is simple and does not require any changes to the doctor's operation.

[0071] In this embodiment, as Figure 11 As shown, the catheter assembly 210 may further include an intermediate tube 213 disposed between the inner catheter 211 and the outer catheter 212. The proximal end of the intermediate tube 213 is inserted into and fixed to the proximal end of the housing 221, specifically fixed to the needle hub 224. The distal end of the intermediate tube 213 abuts against the vascular stent to prevent the vascular stent from being fitted onto the inner catheter 211 and moving towards the proximal end of the inner catheter 211. The intermediate tube 213 can fix the specific position of the vascular stent between the inner catheter 211 and the outer catheter 212, and prevent the vascular stent from sliding on the inner catheter 211 with the outer catheter 212 under the action of friction, ensuring that the vascular stent can be safely and accurately released. It is worth noting that, in addition to using the intermediate tube 213 to implement vascular stent positioning, vascular stent positioning can also be achieved by setting a flange on the inner catheter 211, etc.

[0072] In this embodiment, as Figure 14 As shown, the catheter assembly 210 also includes a protective tube 214, which is fitted onto the outer catheter 212 with a gap. The length of the protective tube 214 can be selected to control the movement of the outer catheter 212. For example, a radially enlarged expansion section can be constructed on the outer catheter 212. When the outer catheter 212 moves towards the proximal end of the inner catheter 211 and the vascular stent is fully exposed beyond the distal end of the outer catheter 212, the expansion section of the outer catheter 212 abuts against the distal end of the protective tube 214. At this point, the operator cannot continue to move the outer catheter 212 towards the proximal end of the inner catheter 211 by continuing to turn the wheel 222. This can be used to remind the operator that the vascular stent has been fully released. Although the delivery system supports single-handed operation, it also allows the operator to use both hands simultaneously when necessary. One hand holds the handle 220 and turns the wheel 222, while the other hand can hold the protective tube 214 to stabilize the entire delivery system and ensure that the vascular stent can be accurately released.

[0073] like Figure 8 and Figure 16As shown, the conveying system also includes an outer track tube 270 that is inserted into the proximal end of the housing 221 and encloses the conduit assembly 210. The transmission mechanism 230 includes a slider 231 that is slidably disposed within the outer track tube 270. The cross-section of the interface between the outer track tube 270 and the slider 231 can be non-circular, such as elliptical, polygonal, or figure-eight shaped, to avoid uncontrolled rotation of the slider 231 within the outer track tube 270. The inner conduit 211 passes through the outer track tube 270 and the slider 231 and connects to the proximal end of the housing 221, while the outer conduit 212 is fixed within the slider 231 to move synchronously with the slider 231.

[0074] like Figure 7 and Figure 8 As shown, the transmission mechanism 230 also includes a spool 232 coaxially fixed to the side of the finger wheel 222, and a pull rope 233 connecting the slider 231 and the spool 232. The finger wheel 222 and the spool 232 can be either a one-piece molded structure or a separate spliced ​​structure; neither is limited here. One end of the pull rope 233 is wound around the spool 232, while the other end is inserted into the outer track tube 270 and connected to the slider 231. When the finger wheel 222 drives the spool 232 to rotate in a selected direction, the spool 232 can retract the pull rope 233 to pull the slider 231 within the outer track tube 270, moving it closer to the proximal end of the housing 221. This causes the outer catheter 212 to move relative to the inner catheter 211 closer to the proximal end of the housing 221, ensuring that the vascular stent distal to the inner catheter 211 can be exposed and self-expanded and detached.

[0075] like Figure 8 As shown, the transmission mechanism 230 also includes an arc-shaped plate 234 and a guide plate 235. The arc-shaped plate 234 is connected to one end of the outer track tube 270 and serves to guide the pull rope 233. The guide plate 235 is fixed to the inner wall of the housing 221 and has a guide hole. The pull rope 233 passes through the arc-shaped plate 234 and then through the guide hole, connecting to the reel 232.

[0076] As an optional example, such as Figure 15 and Figure 17As shown, the conveying system also includes an inner track tube 290 disposed within the housing 221. The proximal end of the inner track tube 290 is fixed to the proximal end of the housing 221, while its distal end is inserted into the outer track tube 270 and the slider 231 and positioned between the outer guide tube 212 and the inner guide tube 211. In an embodiment with an intermediate tube 213, the distal end of the inner track tube 290 may be positioned between the outer guide tube 212 and the intermediate tube 213. The slider 231 and the outer guide tube 212 are configured to slide on the inner track tube 290. The introduction of the inner track tube 290 can assist the outer track tube 270 in providing more reliable support for the sliding of the slider 231. In addition, the presence of the inner track tube 290 can prevent the slider 231 from directly contacting the inner guide tube 211 or the intermediate tube 213 and causing a certain degree of wear and / or breakage during sliding.

[0077] As an optional embodiment, such as Figure 8 and Figure 16 As shown, the delivery system also includes a fixed flexible sleeve 280, which is fixedly connected to the distal end of the outer track tube 270. The cross-section of the flexible sleeve 280 gradually increases along the direction close to the housing 221. The flexible sleeve 280 is preferably made of a highly elastic polymer material such as silicone or rubber. The catheter assembly 210 has a certain degree of flexibility, allowing it to bend to accommodate the curvature of the blood vessel during insertion. Because of this flexibility, the distal end of the catheter assembly 210 is prone to breakage. The presence of the flexible sleeve 280 effectively reduces the risk of breakage at this location.

[0078] like Figure 6 As shown, the handle 220 also includes an annular rubber sleeve 250 and a latch cover 260. The annular rubber sleeve 250 is fitted over the outside of the finger wheel 222, and the latch cover 260 is fitted over the annular rubber sleeve 250 to prevent the finger wheel 222 from being accidentally touched.

[0079] In summary, the delivery system provided by this utility model embodiment has a better fault tolerance rate, which can reduce the operator's operational requirements. Even if the operator reverses the operation of the finger wheel 222, it can effectively prevent the finger wheel 222 from reversing and causing damage to the internal structure of the handle 220, especially the transmission mechanism 230. This ensures that the delivery system can be used normally and reduces the risk of the vascular stent being placed off-center.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A conveying system, characterized in that, include: Housing, finger wheel, transmission mechanism, catheter assembly, and vascular stent; The finger wheel portion and the transmission mechanism are disposed within the housing, the finger wheel is connected to the transmission mechanism, the catheter assembly portion extends outside the housing, the transmission mechanism is connected to the catheter assembly, and the catheter assembly is used to deliver the vascular stent; When the finger wheel rotates, it can drive the transmission mechanism to move, thereby moving the catheter assembly to release the vascular stent; The vascular stent includes a stent body, the diameter of which gradually decreases along its length, or decreases segment by segment.

2. The conveying system according to claim 1, characterized in that, The catheter assembly includes an inner catheter and an outer catheter, the outer catheter being sleeved outside the inner catheter, a first end of the inner catheter and the outer catheter being connected to the housing, a second end of the outer catheter extending beyond the second end of the inner catheter, and a vascular stent disposed inside the second end of the outer catheter; The first end of the external catheter is connected to the transmission mechanism. When the transmission mechanism is activated, it can drive the second end of the external catheter to move closer to the transmission mechanism in order to release the vascular stent.

3. The conveying system according to claim 2, characterized in that, The inner conduit includes a first inner conduit and a second inner conduit, the first inner conduit and the second inner conduit are detachably connected, and the first inner conduit is connected to the housing. The external catheter includes a first external catheter and a second external catheter, the first external catheter and the second external catheter are detachably connected, the first external catheter is connected to the transmission mechanism, and the vascular stent is disposed inside the second external catheter.

4. The conveying system according to claim 1, characterized in that, It also includes a ratchet mechanism, which is coaxially arranged with the finger wheel. When the finger wheel rotates in a set direction, it can drive the ratchet mechanism to rotate. The ratchet mechanism includes a ratchet ring and a ratchet wheel. The ratchet ring is disposed in the housing. The ratchet wheel is coaxially disposed with the finger wheel. The ratchet wheel includes a wheel body and a plurality of pawls. The wheel body is coaxially disposed with the finger wheel. The plurality of pawls are arranged in a ring along the circumferential direction of the wheel body. Each of the pawls includes a bent portion and a toothed portion, the toothed portion being connected to the wheel body via the bent portion, the toothed portion engaging with the ratchet ring, and the bent portion being an elastically bent portion.

5. The conveying system according to claim 1, characterized in that, The support body meets at least one of the following requirements: (1) The diameter gradient difference between the two ends of the support body is 0.5mm-4.0mm; (2) The ratio of the diameter at the minimum point to the diameter at the maximum point of the support body is in the range of 1: 1.0.1～1：1.8； (3) The taper of the support body is 0.02-0.05; (4) The length of the support body is 20mm-200mm; (5) The diameter of the smallest diameter end of the support body is 3mm-12mm.

6. The conveying system according to claim 1, characterized in that, The support body includes: multiple annular supports and multiple sets of connectors. The annular supports are shape memory alloy annular supports. The multiple annular supports are arranged sequentially along the extension direction of the length of the support body. Adjacent annular supports are connected by a set of connectors. Along the length of the support body, the diameters of the plurality of annular supports decrease sequentially.

7. The conveying system according to claim 1, characterized in that, The support body has developing rings at both ends, and the developing rings have developing points.

8. The conveying system according to claim 7, characterized in that, When the support body is conical, the developing ring is provided in the middle of the support body; when the support body is stepped, the developing ring is provided at the point where the diameter of the support body changes.

9. The conveying system according to claim 1, characterized in that, The surface of the stent body is coated with a drug and / or the surface of the stent body is provided with a coating.

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