An embolic delivery system

Abstract

The present invention provides an embolic delivery system, belonging to the technical field of medical devices, comprising: a pushing device and a first protective sheath tube, the interior of the first protective sheath tube having a first accommodating cavity for arranging the embolism, the pushing device being slidably arranged in the first accommodating cavity, the outer diameter of the first protective sheath tube being at least smaller than the inner diameter of a portion of the delivery catheter, and the distal head of the first protective sheath tube being made of a polymer material; the embolic delivery system of the present invention, when using a delivery catheter with a larger inner diameter to deliver the embolism, can deliver the embolism by extending the first protective sheath tube into the delivery catheter and extending the first protective sheath tube along the delivery catheter toward the lesion site of the human body, thereby avoiding the problem of the diameter of the embolism not matching the inner diameter of the delivery catheter, achieving the purpose of one embolism being compatible with multiple delivery catheters at the same time, and being able to greatly reduce the time and cost of doctors exchanging delivery catheters.

Description

Technical Field

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

[0002] Coil embolization is a method of treating aneurysms. It uses several metal alloy coils to isolate the aneurysm from the normal artery, preventing blood from entering the aneurysm and preventing it from rupturing and bleeding.

[0003] For example, a coil system disclosed in Chinese patent document CN113951964B includes a microcatheter and an embolic coil. The embolic coil is installed in the microcatheter. When working, a plurality of embolic coils are delivered to the lesion site through the microcatheter.

[0004] However, in the above solution, spring coils of different specifications need to be used with delivery catheters of corresponding specifications so that the size of the spring coil matches the size of the delivery catheter. Different delivery catheters are not compatible with spring coils of mismatched sizes.

[0005] During coil embolization, users often need to use one or more delivery catheters of different sizes to coordinate with different lesion locations. The specifications of the coil need to be selected based on the path and blood vessel diameter. If a coil can be compatible with multiple delivery catheters at the same time, it will greatly reduce the time and cost of doctors exchanging delivery catheters, that is, the coil can complete its mission more economically, effectively and conveniently. It will also reduce the corresponding production costs (for coil SKUs compatible with different systems). Summary of the invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that different delivery catheters are not compatible with embolic plugs of mismatched sizes, thereby providing an embolic delivery system that can be compatible with delivery catheters of multiple sizes at the same time.

[0007] In order to solve the above technical problems, the present invention provides an embolic delivery system for cooperating with a variety of delivery catheters with different inner diameters. The embolic delivery system includes: a pushing device and a first protective sheath. The interior of the first protective sheath has a first accommodating cavity for arranging the embolism. The pushing device is slidably arranged in the first accommodating cavity. The outer diameter of the first protective sheath is at least smaller than the inner diameter of part of the delivery catheter. The distal head of the first protective sheath is made of polymer material.

[0008] Optionally, the outer diameter of the first protective sheath is larger than the inner diameter of the first delivery catheter, and the inner diameter of the first accommodating cavity matches the inner diameter of the first delivery catheter; when the first delivery catheter is used for delivery, the first protective sheath is supported at the proximal end of the first delivery catheter.

[0009] Optionally, the outer diameter of the first protective sheath matches the inner diameter of the second delivery catheter; when the second delivery catheter is used for delivery, the first protective sheath extends into the interior of the second delivery catheter and moves toward the lesion location under the guidance of the second delivery catheter.

[0010] Optionally, a first fixing device is provided between the proximal end of the first protective sheath and the pushing device.

[0011] Optionally, the first fixing device is a fixing sleeve with different inner diameters at two ends.

[0012] Optionally, it also includes: a second protective sheath, the second protective sheath has a second accommodating cavity, the first protective sheath is slidably inserted in the second accommodating cavity, the outer diameter of the second protective sheath is larger than the inner diameter of the second delivery catheter, and the inner diameter of the second accommodating cavity matches the inner diameter of the second delivery catheter; when the second delivery catheter is used for delivery, the second protective sheath is supported at the proximal end of the second delivery catheter.

[0013] Optionally, it also includes: a second protective sheath, the second protective sheath having a second accommodating cavity, the first protective sheath being slidably inserted in the second accommodating cavity, the outer diameter of the second protective sheath matching the inner diameter of a third delivery catheter; when the third delivery catheter is used for delivery, the second protective sheath extends into the interior of the third delivery catheter and moves toward the lesion location under the guidance of the third delivery catheter.

[0014] Optionally, the hardness of the second protective sheath is greater than the hardness of the first protective sheath.

[0015] Optionally, the first protective sheath and / or the second protective sheath has a developing property.

[0016] Optionally, at least the distal head of the first protective sheath tube and / or the second protective sheath tube is made of polymer material.

[0017] Optionally, the distal end and the proximal end of the second protective sheath are made of different polymer materials, and the two polymer materials are spliced ​​and connected.

[0018] Optionally, lubricating particles are added into the polymer material at the proximal end of the second protective sheath.

[0019] Optionally, a second fixing device is provided between the proximal end of the second protective sheath and the first protective sheath.

[0020] Optionally, the second fixing device is a fixing sleeve with different inner diameters at two ends.

[0021] Optionally, the end of the fixed sleeve with a smaller inner diameter has an openable structure.

[0022] The technical solution of the present invention has the following advantages:

[0023] 1. The embolic delivery system provided by the present invention can deliver the embolic by inserting the first protective sheath into the delivery catheter and extending the first protective sheath along the delivery catheter toward the lesion site in the human body, thereby avoiding the problem of the diameter of the embolic not matching the inner diameter of the delivery catheter, achieving the purpose of one embolic being compatible with multiple delivery catheters at the same time, and greatly reducing the time and cost of doctors exchanging delivery catheters.

[0024] 2. The embolic delivery system provided by the present invention can cooperate with more delivery catheters with different inner diameters by providing a first protective sheath and a second protective sheath, thereby further improving the adaptability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A front view of a specific implementation of the embolic delivery system provided in Example 1 of the present invention;

[0027] Figure 2 A front view of a second method of using the embolic delivery system provided in Example 1;

[0028] Figure 3 A front view of a specific embodiment of the cooperation between the pushing device and the proximal end of the first protective sheath;

[0029] Figure 4 A front view of a specific embodiment of the fixing device;

[0030] Figure 5 for Figure 4 A front view of the fixing device when in use;

[0031] Figure 6 The main intention of the second specific implementation method of the push device and the proximal end of the first protective sheath tube;

[0032] Figure 7 It is a front view of a second specific embodiment of the fixing device;

[0033] Figure 8 for Figure 7 A front view of the fixing device when in use;

[0034] Fig. 9 A front view of a specific implementation of the embolic delivery system provided in Example 2 of the present invention;

[0035] Fig.10 A front view of a second method of using the embolic delivery system provided in Example 2 of the present invention;

[0036] Fig.11 This is a front view of a third method of using the embolic delivery system provided in Example 2 of the present invention.

[0037] Description of reference numerals:

[0038] 1. Pushing device; 2. First protective sheath; 3. Embolization; 4. First delivery catheter; 5. Second delivery catheter; 6. First fixing device; 7. Second protective sheath; 8. Third delivery catheter; 9. Second fixing device; 10. Openable structure; 11. End with smaller inner diameter; 12. End with larger inner diameter. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] Example 1

[0044] The embolic delivery system provided in this embodiment can be used to cooperate with a variety of delivery catheters with different inner diameters to deliver the embolism 3.

[0045] like Figure 1 As shown, a specific implementation of the embolic delivery system provided in this embodiment includes: a pushing device 1 and a first protective sheath 2, wherein the interior of the first protective sheath 2 has a first accommodating cavity for arranging the embolism 3, the pushing device 1 is slidably arranged in the first accommodating cavity, and the outer diameter of the first protective sheath 2 is at least smaller than the inner diameter of part of the delivery catheter. In other words, the embolic delivery system provided in this embodiment can be used for cooperating with a plurality of delivery catheters, each of which has a different inner diameter, and the outer diameter of the first protective sheath 2 in this embodiment is at least smaller than the inner diameter of part of the delivery catheters among the plurality of delivery catheters. During use, when a delivery catheter with a larger inner diameter is used to deliver the embolism 3, the first protective sheath 2 can be delivered by extending it into the delivery catheter and extending it along the delivery catheter toward the lesion site of the human body, thereby avoiding the problem that the diameter of the embolism 3 does not match the inner diameter of the delivery catheter, and ensuring that the embolism 3 can be smoothly implanted into the human body.

[0046] It should be noted that in this embodiment, the embolism may be a spring coil. Of course, this example is not restrictive, and in some alternative embodiments, the embolism may also be other elongated embolism structures, such as a braided embolism structure.

[0047] like Figure 1 As shown, in this embodiment, the outer diameter of the first protective sheath 2 is larger than the inner diameter of the first delivery catheter 4, and the inner diameter of the first accommodating cavity matches the inner diameter of the first delivery catheter 4; when the first delivery catheter 4 is used for delivery, the first protective sheath 2 is supported on the proximal end of the first delivery catheter 4; specifically, when the first delivery catheter 4 is used for delivery, the distal end of the first protective sheath 2 can be docked to the catheter seat, and then the embolism 3 located in the first accommodating cavity is pushed out from the distal end of the first protective sheath 2 by the pushing device 1, and the embolism 3 is further made to enter the first delivery catheter 4, and the pushing device 1 is continued to be pushed so that the embolism 3 is transported in the first delivery catheter 4 and finally reaches the lesion location of the human body.

[0048] like Figure 2As shown, in this embodiment, the outer diameter of the first protective sheath 2 matches the inner diameter of the second delivery catheter 5; when the second delivery catheter 5 is used for delivery, the first protective sheath 2 extends into the interior of the second delivery catheter 5, and moves toward the lesion position under the guidance of the second delivery catheter 5; specifically, when the second delivery catheter 5 is used for delivery, the distal end of the first protective sheath 2 can be inserted into the second delivery catheter 5 from the catheter seat of the second delivery catheter 5, and then the first protective sheath 2 is pushed. The length of the first protective sheath 2 is greater than the length of the delivery catheter. The embolism 3 is transported in the second delivery catheter 5 with the first protective sheath 2. When the lesion position is reached, the embolism 3 is pushed out from the first accommodating cavity of the second delivery catheter 5 by the pushing device 1, thereby reaching the lesion.

[0049] In summary, in the embolic delivery system provided in this embodiment, the inner diameter of the first accommodating cavity of the first protective sheath tube 2 matches the inner diameter of the first delivery catheter 4, and the outer diameter of the first protective sheath tube 2 matches the inner diameter of the second delivery catheter 5. Through the above arrangement, the purpose of one embolic plug 3 being compatible with multiple delivery catheters at the same time is achieved, which can greatly reduce the time and cost of doctors exchanging delivery catheters.

[0050] like Figure 2 As shown, in the embolic delivery system provided in this embodiment, a first fixing device 6 is provided between the proximal end of the first protective sheath tube 2 and the pushing device 1. The first fixing device 6 is used to relatively fix the first protective sheath tube 2 and the pushing device 1, so that during the delivery of the first protective sheath tube 2 in the delivery catheter, the pushing device 1 and the first protective sheath tube 2 can not move relative to each other.

[0051] like Figure 3 As shown, when the structure between the proximal end of the first protective sheath 2 and the proximal end of the pushing device 1 is: the proximal end of the pushing device 1 extends from one side of the proximal end of the first protective sheath 2. That is to say, there is a section of incision on one side of the proximal end of the first protective sheath 2, and the proximal end of the pushing device 1 can pass through the side wall of the first protective sheath 2. In this structure, the outer diameter of the pushing device 1 is a, the inner diameter of the first protective sheath 2 is b, and the outer diameter of the first protective sheath 2 is c, where a<b. For this structure, the following can be used Figure 4 The first fixing device 6 is shown.

[0052] like Figure 4As shown, the first fixing device 6 is a fixing sleeve with different inner diameters at both ends. Specifically, it includes an end 12 with a larger inner diameter and an end 11 with a smaller inner diameter. Among them, the inner diameter of the end 11 with a smaller inner diameter is e, and the inner diameter of the end 12 with a larger inner diameter is d, where e < d.

[0053] During use, as Figure 5 shown, the first fixing device 6 is sleeved on the proximal end where the pushing device 1 and the first protective sheath 2 are combined. Among them, the end 12 with a larger inner diameter is sleeved on the first protective sheath 2, and the end 11 with a smaller inner diameter is sleeved on the pushing device 1, specifically satisfying e < a + b < d, so as to realize the fixation of the two by a tight fit.

[0054] As Figure 6 shown, when the structure between the proximal end of the first protective sheath 2 and the proximal end of the pushing device 1 is: the proximal end of the pushing device 1 extends from the end wall of the proximal end of the first protective sheath 2. In this structure, the outer diameter of the pushing device 1 is a, the inner diameter of the first protective sheath 2 is b, and the outer diameter of the first protective sheath 2 is c, where a < b. The first fixing device 6 as shown in Figure 7 can be used.

[0055] As Figure 7 shown, the first fixing device 6 is a fixing sleeve with different inner diameters at both ends. Specifically, it includes an end 12 with a larger inner diameter and an end 11 with a smaller inner diameter. Among them, the inner diameter of the end 11 with a smaller inner diameter is e, and the inner diameter of the end 12 with a larger inner diameter is d, where e < d. And the end 11 with a smaller inner diameter of this fixing sleeve has an openable structure 10.

[0056] During use, as Figure 8 shown, the end 12 with a larger inner diameter of the fixing sleeve is sleeved on the first protective sheath 2, satisfying c < d; the end 11 with a smaller inner diameter of the fixing sleeve is sleeved on the pushing device 1, satisfying a ≥ e. Through the separate fixation of the fixing sleeve, the first protective sheath 2 and the pushing device 1 are relatively fixed.

[0057] It should be noted that the openable structure 10 of the end 11 with a smaller inner diameter of the fixing sleeve in this embodiment is not limited. It can be a structure where one end is connected by a rotating shaft and the other end is locked by clamping, or it can also be locked by buckling, etc.

[0058] It should be noted that the uses of the first delivery catheter 4 and the second delivery catheter 5 in this embodiment are not specifically limited. It can be that the first delivery catheter 4 is a micro catheter and the second delivery catheter 5 is an angiography catheter, etc.

[0059] In addition, in the present embodiment, the first protective sheath tube 2 may have a developable property, and specific implementation methods include but are not limited to: developing materials are added to polymer material particles so that the whole body is developable after molding, and the developing materials are such as barium sulfate, bismuth oxide, tungsten powder, etc.; or, a developing ring is forged at the head end of the first protective sheath tube 2, such as 0-2cm, and the developing ring is made of Pt / Ir and other materials with developable properties; or a section of heat shrinkable tube with a developing material added is heat shrunk at the head end of the first protective sheath tube 2, such as 0-2cm.

[0060] In this embodiment, the first protective sheath 2 meets the requirements of low friction coefficient, bending performance and support, and the implementation methods of meeting the above performance include but are not limited to: ① Using polymer materials with low friction coefficient and good support, such as PTFE, HDPE, POM, etc., and stretching and reducing the diameter of the head end, so that it has good passability at the same time; ② Using polymer materials with good bending performance and certain support, such as Pebax, Nylon, etc., adding lubricating particles to the polymer materials, so as to reduce its friction coefficient; or, it is formed by splicing the above two polymer materials ① and ②, that is, the distal end is material ①, and the proximal end is material ②, and they are connected and fixed by methods such as heat welding, laser welding, resistance welding, etc.

[0061] The embolic delivery system provided in this embodiment, when used, Figure 1 As shown, when the inner diameter of the used delivery catheter is smaller than the outer diameter of the first protective sheath 2, the following steps are included: the distal end of the first protective sheath 2 is docked onto the catheter seat, and then the embolism 3 located in the first accommodating cavity is pushed out from the distal end of the first protective sheath 2 by the pushing device 1, and the embolism 3 is further made to enter the first delivery catheter 4, and the pushing device 1 is continued to be pushed so that the embolism 3 is transported in the first delivery catheter 4 and finally reaches the lesion location of the human body.

[0062] like Figure 2 As shown, when the inner diameter of the delivery catheter used is greater than the outer diameter of the first protective sheath tube 2, the following steps are included:

[0063] The pushing device 1 and the plug 3 are arranged in the first accommodating cavity of the first protective sheath 2;

[0064] At the proximal end of the first protective sheath tube 2, the pushing device 1 and the first protective sheath tube 2 are relatively fixed;

[0065] Insert the distal end of the first protective sheath tube 2 into the delivery catheter, and extend it into the lesion site of the human body along the delivery catheter;

[0066] When the distal end of the first protective sheath tube 2 reaches the human lesion site, the relative fixation between the pushing device 1 and the first protective sheath tube 2 is released, and the embolism 3 is transported from the distal end of the first protective sheath tube 2 to the human lesion site through the pushing device 1.

[0067] The embolic delivery system provided in this embodiment achieves the purpose that one embolic plug 3 can be compatible with multiple delivery catheters at the same time, which can greatly reduce the time and cost of doctors exchanging delivery catheters.

[0068] Example 2

[0069] like Fig. 9 As shown, a specific implementation of the embolic delivery system provided in this embodiment, based on embodiment 1, further includes: a second protective sheath tube 7. The second protective sheath tube 7 has a second accommodating cavity, the first protective sheath tube 2 is slidably inserted in the second accommodating cavity, the outer diameter of the second protective sheath tube 7 is larger than the inner diameter of the second delivery catheter 5, and the inner diameter of the second accommodating cavity matches the inner diameter of the second delivery catheter 5; when the second delivery catheter 5 is used for delivery, the second protective sheath tube 7 is supported at the proximal end of the second delivery catheter 5.

[0070] like Fig. 9 As shown, in the embolic delivery system provided in this embodiment, when the second delivery catheter 5 is used for delivery, the following steps are included:

[0071] First, the distal end of the second protective sheath tube 7 is docked onto the catheter seat of the second delivery catheter 5 , so that the second protective sheath tube 7 plays a supporting role to ensure the stability of the first protective sheath tube 2 during pushing.

[0072] Then, the first protective sheath 2 is pushed into the second delivery catheter 5 , so that the embolizer 3 and the pushing device 1 are delivered along the second delivery catheter 5 .

[0073] Furthermore, when the second delivery catheter 5 is used for delivery, the following steps are included:

[0074] First, the distal end of the second protective sheath tube 7 is docked onto the catheter seat of the second delivery catheter 5 , so that the second protective sheath tube 7 plays a supporting role to ensure the stability of the first protective sheath tube 2 during pushing.

[0075] Then, the second fixing device 9 (removed in the figure and therefore not shown) at the proximal end of the first protective sheath 2 and the second protective sheath 7 is removed, and the first protective sheath 2 is pushed into the second delivery catheter 5, thereby carrying the embolism 3 and the pushing device 1 for delivery along the second delivery catheter 5.

[0076] When the embolism 3 and the first protective sheath 2 reach the lesion location, the first protective sheath 2 and the first fixing device 6 at the proximal end of the pushing device 1 are removed, and the embolism 3 is pushed out of the distal end of the first protective sheath 2 by the pushing device 1 to reach the lesion location of the human body.

[0077] like Fig.10 As shown, in the embolic delivery system provided in this embodiment, when the first delivery catheter 4 is used for delivery, the following steps are included:

[0078] First, the first protective sheath tube 2 is pushed out of the second protective sheath tube 7 from the distal end of the second protective sheath tube 7 .

[0079] Then, the distal end of the first protective sheath 2 is connected to the catheter seat of the first delivery catheter 4 .

[0080] The embolism 3 is then pushed out from the first protective sheath 2 by the pushing device 1 , so that the embolism 3 enters the first delivery catheter 4 and enters the lesion site of the human body along the first delivery catheter 4 .

[0081] Further, when the first delivery catheter 4 is used for delivery, the following steps are included:

[0082] First, assemble the first protective sheath tube 2 and the second protective sheath tube 7, push the distal end of the first protective sheath tube 2 out of the second protective sheath tube 7, and install the second fixing device 9 between the first protective sheath tube 2 and the second protective sheath tube 7. Then, dock the distal end of the first protective sheath tube 2 onto the catheter seat of the first delivery catheter 4.

[0083] Then remove the first protective sheath 2 and the first fixing device 6 (removed in the figure, so not shown) at the proximal end of the pushing device 1, and push the embolism 3 out of the first protective sheath 2 through the pushing device 1, so that the embolism 3 enters the first delivery catheter 4 and enters the lesion location of the human body along the first delivery catheter 4.

[0084] It should be noted that, in this embodiment, the hardness of the second protective sheath tube 7 is greater than the hardness of the first protective sheath tube 2. Through this configuration, it can be ensured that the first protective sheath tube 2 can be smoothly transported in the second protective sheath tube 7. Of course, this is not restrictive, and in some alternative embodiments, the hardness of the first protective sheath tube 2 and the second protective sheath tube 7 can also be the same.

[0085] like Fig.11As shown, in the embolic delivery system provided in this embodiment, the outer diameter of the second protective sheath 7 matches the inner diameter of the third delivery catheter 8; that is, in the embolic delivery system provided in this embodiment, the inner diameter of the second accommodating cavity of the second delivery catheter 5 matches the inner diameter of the second delivery catheter 5, and the outer diameter of the second delivery catheter 5 matches the inner diameter of the third delivery catheter 8.

[0086] When the third delivery catheter 8 is used for delivery, the second protective sheath 7 extends into the interior of the third delivery catheter 8 and moves toward the lesion location under the guidance of the third delivery catheter 8 .

[0087] Specifically, when the third delivery catheter 8 is used for delivery, the following steps are included:

[0088] First, the first protection sheath tube 2 , the pushing device 1 , and the proximal ends of the second protection sheath tube 7 are relatively fixed by means of the first fixing device 6 and the second fixing device 9 .

[0089] Then, the distal end of the second protective sheath 7 is inserted into the third delivery catheter 8 and extended along the third delivery catheter 8 into the lesion site of the human body.

[0090] When the distal end of the second protective sheath 7 reaches the human lesion site, the first fixing device 6 between the pushing device 1 and the proximal end of the first protective sheath 2 is released, and the embolism 3 is transported from the distal end of the first protective sheath 2 to the human lesion site through the pushing device 1.

[0091] like Fig.11 As shown, in the embolic delivery system provided in this embodiment, a second fixing device 9 is provided between the proximal end of the second protective sheath tube 7 and the first protective sheath tube 2. The second fixing device 9 is used to relatively fix the first protective sheath tube 2 and the second protective sheath tube 7, so that the first protective sheath tube 2 and the second protective sheath tube 7 do not move relative to each other during the process of being delivered together in the delivery catheter. The second fixing device 9 and the first fixing device 6 can have the same structure, which will not be described in detail here.

[0092] With the above arrangement, when the second protective sheath tube 7 is extended into the human lesion position along the delivery catheter, if the distal end of the second protective sheath tube 7 cannot reach the human lesion position after the second protective sheath tube 7 is fully extended into the delivery catheter, it is also possible to: first release the second fixing device 9 at the proximal end of the first protective sheath tube 2 and the second protective sheath tube 7, and continue to extend the first protective sheath tube 2 into the human lesion position along the delivery catheter. When the distal end of the first protective sheath tube 2 reaches the human lesion position, release the first fixing device 6 at the proximal end of the pushing device 1 and the first protective sheath tube 2, and deliver the embolism 3 from the distal end of the first protective sheath tube 2 to the human lesion position through the pushing device 1.

[0093] It should be noted that in this embodiment, the uses of the first delivery catheter 4, the second delivery catheter 5 and the third delivery catheter 8 are not specifically limited, and they can all be microcatheters or the like.

[0094] In addition, in this embodiment, the second protective sheath tube 7 can have a developing property, and the specific implementation methods include but are not limited to: the polymer material particles are added with a developing material, so that the whole body is developed after molding, and the developing material is such as barium sulfate, bismuth oxide, tungsten powder, etc.; or, the head end of the second protective sheath tube 7, such as 0-2cm, is forged with a developing ring, and the developing ring is made of Pt / Ir and other materials with developing properties; or the head end of the second protective sheath tube 7, such as 0-2cm, is heat-shrunk to a section of heat shrinkable tube with added developing material, etc.

[0095] In this embodiment, the second protective sheath 7 meets the requirements of low friction coefficient, bending performance and support, and the implementation methods of meeting the above performance include but are not limited to: ① Using a polymer material with a low friction coefficient and good support, such as PTFE, HDPE, POM, etc., and stretching and reducing the diameter of the head end, so that it has good passability at the same time; ② Using a polymer material with good bending performance and a certain degree of support, such as Pebax, Nylon, etc., adding lubricating particles to the polymer material to reduce its friction coefficient; or, it is formed by splicing the above two polymer materials ① and ②, that is, the distal end is material ①, and the proximal end is material ②, and they are connected and fixed by methods such as heat welding, laser welding, resistance welding, etc.

[0096] The embolic delivery system provided in this embodiment achieves the purpose that one embolic plug 3 can be compatible with multiple delivery catheters at the same time, which can greatly reduce the time and cost of doctors exchanging delivery catheters.

[0097] In addition, it should be noted that, in the above embodiments, the distal end refers to the end away from the operator, and the proximal end refers to the end close to the operator.

[0098] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the present invention.

Claims

1. An embolic delivery system, characterized in that: The embolic delivery system is used to cooperate with a variety of delivery catheters with different inner diameters, and comprises: a pushing device (1), a first protective sheath tube (2) and a second protective sheath tube (7), wherein the first protective sheath tube (2) has a first accommodating cavity for arranging the embolism (3), the pushing device (1) is slidably arranged in the first accommodating cavity, the distal end head of the first protective sheath tube (2) is made of polymer material, the second protective sheath tube (7) has a second accommodating cavity, and the first protective sheath tube (2) is slidably inserted in the second accommodating cavity; The outer diameter of the first protective sheath tube (2) is greater than the inner diameter of the first delivery catheter (4), the inner diameter of the first accommodating cavity matches the inner diameter of the first delivery catheter (4), and when the first delivery catheter (4) is used for delivery, the first protective sheath tube (2) is supported at the proximal end of the first delivery catheter (4); The outer diameter of the first protective sheath tube (2) matches the inner diameter of the second delivery catheter (5); when the second delivery catheter (5) is used for delivery, the first protective sheath tube (2) extends into the interior of the second delivery catheter (5) and moves toward the lesion location under the guidance of the second delivery catheter (5); The outer diameter of the second protective sheath (7) matches the inner diameter of the third delivery catheter (8). When the third delivery catheter (8) is used for delivery, the second protective sheath (7) extends into the interior of the third delivery catheter (8) and moves toward the lesion location under the guidance of the third delivery catheter (8).

2. The embolic delivery system according to claim 1, characterized in that: A first fixing device (6) is provided between the proximal end of the first protective sheath tube (2) and the pushing device (1).

3. The embolic delivery system according to claim 2, characterized in that: The first fixing device (6) is a fixing sleeve with different inner diameters at both ends.

4. The embolic delivery system according to claim 1, characterized in that: The outer diameter of the second protective sheath (7) is greater than the inner diameter of the second delivery catheter (5), and the inner diameter of the second accommodating cavity matches the inner diameter of the second delivery catheter (5); when the second delivery catheter (5) is used for delivery, the second protective sheath (7) is supported at the proximal end of the second delivery catheter (5).

5. The embolic delivery system according to any one of claims 1 to 4, characterized in that: The hardness of the second protective sheath tube (7) is greater than the hardness of the first protective sheath tube (2).

6. The embolic delivery system according to any one of claims 1 to 4, characterized in that: The first protective sheath tube (2) and / or the second protective sheath tube (7) has a developing property.

7. The embolic delivery system according to any one of claims 1 to 4, characterized in that: At least the distal head of the second protective sheath (7) is made of polymer material.

8. The embolic delivery system according to claim 7, characterized in that: The distal end and the proximal end of the first protective sheath tube (2) and / or the second protective sheath tube (7) are made of different polymer materials, and the two polymer materials are spliced ​​and connected.

9. The embolic delivery system according to claim 7, characterized in that: Lubricating particles are added into the polymer material at the proximal end of the first protective sheath tube (2) and / or the second protective sheath tube (7).

10. The embolic delivery system according to any one of claims 1 to 4, characterized in that: A second fixing device (9) is provided between the proximal end of the second protective sheath tube (7) and the first protective sheath tube (2).

11. The embolic delivery system according to claim 10, wherein: The second fixing device (9) is a fixing sleeve with different inner diameters at both ends.

12. The embolic delivery system according to claim 3 or 11, characterized in that: The end (11) of the fixed sleeve with a smaller inner diameter has an openable structure (10).

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