CN117814866A

CN117814866A - Embolic delivery system

Info

Publication number: CN117814866A
Application number: CN202311814464.1A
Authority: CN
Inventors: 林冠宇; 戎佳琦; 华育然; 骆建忠
Original assignee: Jianyuan Medical Technology Wuxi Co ltd
Current assignee: Jianyuan Medical Technology Wuxi Co ltd
Priority date: 2023-12-26
Filing date: 2023-12-26
Publication date: 2024-04-05

Abstract

The invention provides an embolism conveying system, which belongs to the technical field of medical appliances and comprises: the device comprises a pushing device and a first protective sheath, wherein a first accommodating cavity for accommodating a plug is formed in the first protective sheath, the pushing device is arranged in the first accommodating cavity in a sliding mode, the outer diameter of the first protective sheath is at least smaller than the inner diameter of a part of the conveying catheter, and the distal end head of the first protective sheath is made of a high polymer material; when the embolism conveying system adopts the conveying guide pipe with larger inner diameter to convey the embolism, the first protective sheath pipe can extend into the conveying guide pipe and convey the embolism in a mode of extending towards the focus position of a human body along the conveying guide pipe, so that the problem that the diameter of the embolism is not matched with the inner diameter of the conveying guide pipe is avoided, the aim that one embolism can be compatible with a plurality of conveying guide pipes at the same time is fulfilled, and the time and cost for a doctor to exchange the conveying guide pipes can be greatly reduced.

Description

Embolic delivery system

Technical Field

The invention relates to the technical field of medical instruments, in particular to an embolism conveying system.

Background

The coil embolism operation is one method of treating aneurysm, and is to isolate the aneurysm from normal artery through several coils of metal alloy material to prevent blood from entering the aneurysm and rupture and bleeding.

A spring coil system as disclosed in chinese patent document CN113951964B includes a microcatheter and embolic coils housed within the microcatheter through which, in operation, a plurality of embolic coils are delivered to a focal location.

However, in the above-mentioned scheme, when using, the coils with different specifications need to be matched with the conveying pipes with corresponding specifications, so that the sizes of the coils are matched with those of the conveying pipes, and the coils with different sizes cannot be compatible with the conveying pipes.

In performing a coil embolization procedure, a user often needs to use one or more delivery catheters of different sizes to fit in place, depending on the location of the lesion. The specification of the spring ring needs to be selected according to the path, the diameter of the blood vessel and the like, if one spring ring can be compatible with a plurality of delivery catheters simultaneously, the time and the cost for a doctor to exchange the delivery catheters can be greatly reduced, namely, the spring ring can complete the service life more economically, effectively and conveniently. And will also reduce (to accommodate spring coil SKUs of different systems) the corresponding production costs.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defect that different delivery catheters cannot be compatible with the embolization with unmatched sizes in the prior art, so as to provide an embolization delivery system capable of simultaneously being compatible with multiple delivery catheters with different sizes.

In order to solve the above technical problems, the present invention provides an embolic delivery system for cooperation with a plurality of delivery catheters having different inner diameters, the embolic delivery system comprising: the device comprises a pushing device and a first protective sheath, wherein a first accommodating cavity for accommodating a plug is formed in the first protective sheath, the pushing device is arranged in the first accommodating cavity in a sliding manner, and the outer diameter of the first protective sheath is at least smaller than the inner diameter of part of the conveying catheter; the distal end head of the primary protective sheath is made of high polymer material.

Optionally, the outer diameter of the first protective sheath is larger than the inner diameter of the first conveying guide pipe, and the inner diameter of the first accommodating cavity is matched with the inner diameter of the first conveying guide pipe; the first protective sheath is supported at the proximal end of the first delivery catheter for delivery using the first delivery catheter.

Optionally, the outer diameter of the first protective sheath matches the inner diameter of the second delivery catheter; when the second conveying catheter is adopted for conveying, the first protective sheath stretches into the second conveying catheter and moves towards the focus position through the guide of the second conveying catheter.

Optionally, a first fixing device is disposed between the proximal end of the first protective sheath and the pushing device.

Optionally, the first fixing device is a fixing sleeve with two ends having different inner diameters.

Optionally, the method further comprises: the second protective sheath is provided with a second accommodating cavity, the first protective sheath is inserted into the second accommodating cavity in a sliding manner, the outer diameter of the second protective sheath is larger than the inner diameter of the second conveying catheter, and the inner diameter of the second accommodating cavity is matched with the inner diameter of the second conveying catheter; the second protective sheath is supported at the proximal end of the second delivery catheter for delivery using the second delivery catheter.

Optionally, the method further comprises: a second protective sheath having a second receiving cavity, the first protective sheath being slidably inserted into the second receiving cavity, an outer diameter of the second protective sheath being matched with an inner diameter of the third delivery catheter; when the third conveying catheter is adopted for conveying, the second protective sheath stretches into the third conveying catheter and moves towards the focus position through the guidance of the third conveying catheter.

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

Optionally, the first protective sheath and/or the second protective sheath are developable.

Optionally, at least the distal head of the first protective sheath and/or the second protective sheath is a polymeric material.

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.

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

Optionally, a second fixing device is arranged between the proximal end of the second protective sheath and the first protective sheath.

Optionally, the second fixing device is a fixing sleeve with two ends having different inner diameters.

Optionally, the smaller inner diameter end of the fixed sleeve has an openable structure.

The technical scheme of the invention has the following advantages:

1. when the embolism conveying system provided by the invention adopts the conveying guide pipe with larger inner diameter to convey the embolism, the first protective sheath pipe can extend into the conveying guide pipe and convey the embolism in a mode of extending towards the focus position of a human body along the conveying guide pipe, so that the problem that the diameter of the embolism is not matched with the inner diameter of the conveying guide pipe is avoided, the aim that one embolism can be compatible with a plurality of conveying guide pipes at the same time is realized, and the time and cost for a doctor to exchange the conveying guide pipes can be greatly reduced.

2. According to the embolic delivery system provided by the invention, the first protective sheath and the second protective sheath are arranged to be matched with a plurality of delivery catheters with different inner diameters, so that the suitability of products is further improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a front view of one embodiment of an embolic delivery system provided in example 1 of the present invention;

FIG. 2 is a front view of a second method of using the embolic delivery system provided in embodiment 1;

FIG. 3 is a front view of one embodiment of the proximal mating of the pusher and the primary protective sheath;

FIG. 4 is a front view of one embodiment of a fixation device;

FIG. 5 is a front view of the fixture of FIG. 4 in use;

FIG. 6 is a schematic illustration of a second embodiment of the proximal mating of a pusher device and a primary protective sheath;

FIG. 7 is a front view of a second embodiment of a fixation device;

FIG. 8 is a front view of the fixture of FIG. 7 in use;

FIG. 9 is a front view of one embodiment of an embolic delivery system provided in example 2 of the present invention;

FIG. 10 is a front view of a second method of using the embolic delivery system provided in embodiment 2 of the present invention;

fig. 11 is a front view showing a third method of using the embolic delivery system provided in embodiment 2 of the present invention.

Reference numerals illustrate:

1. a pushing device; 2. a primary protective sheath; 3. a plug; 4. a first delivery catheter; 5. a second delivery catheter; 6. a first fixing device; 7. a second protective sheath; 8. a third delivery catheter; 9. a second fixing device; 10. an openable structure; 11. one end with smaller inner diameter; 12. the end with larger inner diameter.

Detailed Description

The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.

Example 1

The embolic delivery system provided by the present embodiment can be used to cooperate with a variety of delivery catheters of different inner diameters to deliver the embolic 3.

As shown in fig. 1, a specific implementation manner of the embolic delivery system provided in this embodiment includes: the device comprises a pushing device 1 and a first protective sheath 2, wherein a first accommodating cavity for accommodating a plug 3 is formed in the first protective sheath 2, 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 part of the inner diameter of the conveying catheter. In other words, the embolic delivery system provided in this embodiment has a plurality of delivery catheters available for cooperation, each of the delivery catheters having a different inner diameter, the outer diameter of the primary protective sheath 2 of this embodiment being at least smaller than the inner diameter of a portion of the delivery catheters of the plurality of delivery catheters. When the plug 3 is conveyed by adopting the conveying conduit with larger inner diameter, the first protective sheath 2 can be conveyed by extending into the conveying conduit and extending along the conveying conduit towards the focus position of the human body, so that the problem that the diameter of the plug 3 is not matched with the inner diameter of the conveying conduit is avoided, and the plug 3 can be stably implanted into the human body.

In this embodiment, the plug may be a spring coil. Of course, this example is not limiting, and in some alternative embodiments the plug may be other elongated plug structures, such as braided plug structures, and the like.

As shown in fig. 1, in this embodiment, the outer diameter of the first protecting sheath 2 is larger than the inner diameter of the first delivery catheter 4, and the inner diameter of the first accommodating cavity is matched with the inner diameter of the first delivery catheter 4; the first protective sheath 2 is supported at the proximal end of the first delivery catheter 4 when delivering with 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 abutted to the catheter seat, then the plug 3 positioned 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 plug 3 is further led into the first delivery catheter 4, and the pushing device 1 is further pushed forward, so that the plug 3 is delivered in the first delivery catheter 4, and finally reaches the focus position of the human body.

As shown in fig. 2, in this embodiment, the outer diameter of the primary protective sheath 2 matches the inner diameter of the secondary delivery catheter 5; when the second conveying catheter 5 is adopted for conveying, the first protective sheath 2 stretches into the second conveying catheter 5 and moves towards the focus position through the guidance of the second conveying catheter 5; specifically, when the second delivery catheter 5 is used for delivery, the distal end of the first protection sheath 2 can be inserted into the second delivery catheter 5 from the catheter seat of the second delivery catheter 5, then the first protection sheath 2 is pushed, the length of the first protection sheath 2 is longer than that of the delivery catheter, the first protection sheath 2 carries the embolism 3 with the embolism 3 in the second delivery catheter 5 to deliver, and after reaching the focus position, the embolism 3 is pushed out of the first accommodating cavity of the second delivery catheter 5 by the pushing device 1, so that the focus is reached.

In summary, in the embolic delivery system provided in this embodiment, the inner diameter of the first accommodating cavity of the first protecting sheath 2 is matched with the inner diameter of the first delivery catheter 4, and the outer diameter of the first protecting sheath 2 is matched with the inner diameter of the second delivery catheter 5. Through the arrangement, the purpose that one embolism 3 can be compatible with a plurality of delivery catheters is achieved, and the time and cost for exchanging the delivery catheters by doctors can be greatly reduced.

As shown in fig. 2, in the embolic delivery system provided in this embodiment, a first fixing device 6 is disposed between the proximal end of the first protecting sheath 2 and the pushing device 1. The first fixing device 6 is used for relatively fixing the first protecting sheath 2 and the pushing device 1, so that the pushing device 1 and the first protecting sheath 2 can not move mutually in the process of conveying the first protecting sheath 2 in the conveying catheter.

As shown in fig. 3, when the structure between the proximal end of the primary protecting sheath 2 and the proximal end of the pushing device 1 is: the proximal end of the pushing device 1 protrudes from the proximal side of the primary protective sheath 2. That is, a cut is formed at one side of the proximal end of the primary protective sheath 2, and the proximal end of the pushing device 1 may be passed out from the side wall of the primary protective sheath 2. In this structure, the outer diameter of the pushing device 1 is a, the inner diameter of the primary protecting sheath 2 is b, and the outer diameter of the primary protecting sheath 2 is c, wherein a < b. For this structure, the first fixing means 6 as shown in fig. 4 may be employed.

As shown in fig. 4, the first fixing device 6 is a fixing sleeve with two ends having different inner diameters, specifically, the fixing sleeve includes an end 12 with a larger inner diameter and an end 11 with a smaller inner diameter, wherein the inner diameter of the end 11 with the smaller inner diameter is e, and the inner diameter of the end 12 with the larger inner diameter is d, where e < d.

When in use, as shown in fig. 5, the first fixing device 6 is sleeved at the proximal end of the pushing device 1 and the first protecting sheath tube 2, wherein the end 12 with the larger inner diameter is sleeved on the first protecting sheath tube 2, and the end 11 with the smaller inner diameter is sleeved on the pushing device 1, so that e < a+b < d is specifically satisfied, and the fixing of the pushing device and the first protecting sheath tube is realized through tight fit.

As shown in fig. 6, when the structure between the proximal end of the primary protecting sheath 2 and the proximal end of the pushing device 1 is: the proximal end of the pushing device 1 protrudes from the end wall of the proximal end of the primary protective sheath 2. In this structure, the outer diameter of the pushing device 1 is a, the inner diameter of the primary protecting sheath 2 is b, and the outer diameter of the primary protecting sheath 2 is c, wherein a < b. A first fixing means 6 as shown in fig. 7 may be employed.

As shown in fig. 7, the first fixing device 6 is a fixing sleeve with two ends having different inner diameters, specifically, the fixing sleeve includes an end 12 with a larger inner diameter and an end 11 with a smaller inner diameter, wherein the inner diameter of the end 11 with the smaller inner diameter is e, and the inner diameter of the end 12 with the larger inner diameter is d, where e < d. And, the smaller inner diameter end 11 of the fixed sleeve has an openable structure 10.

When in use, as shown in fig. 8, one end 12 of the fixed sleeve with larger inner diameter is sleeved on the primary protective sheath 2, so as to meet the requirement of c < d; one end 11 with smaller inner diameter of the fixed sleeve is sleeved on the pushing device 1, so that a is more than or equal to e, and the first protective sheath 2 and the pushing device 1 are relatively fixed through the respective fixation of the fixed sleeve.

In this embodiment, the openable structure 10 of the smaller inner diameter end 11 of the fixed sleeve is not limited, and may be a structure in which one end is connected through a rotating shaft and the other end is locked through a clamping connection, or may be locked by a fastening connection.

In the present embodiment, the use of the first delivery catheter 4 and the second delivery catheter 5 is not particularly limited, and the first delivery catheter 4 may be a microcatheter, and the second delivery catheter 5 may be a contrast catheter, or the like.

In addition, in this embodiment, the primary protective sheath 2 may have developability, and specific implementations include, but are not limited to: developing materials such as barium sulfate, bismuth oxide, tungsten powder and the like are added into the polymer material particles so as to develop the whole body after molding; or, the head end of the first protective sheath tube 2 is provided with a developing ring by forging and pressing at a position of 0-2cm, and the developing ring is made of materials with developing properties such as Pt/Ir; or the head end of the primary protective sheath 2 is heat-shrunk by a heat shrink tube with a section of developing material added at the position of 0-2 cm.

In the present embodiment, the primary protective sheath 2 satisfies the low friction coefficient, the overstock property and the supportability, and the realization ways of satisfying the above properties include, but are not limited to: (1) a high polymer material with a low friction coefficient and good supporting property, such as PTFE, HDPE, POM, is used for stretching and reducing the head end of the material, so that the material has good passing property; (2) the high polymer material with good bending performance and certain supporting property, such as Pebax, nylon and the like, is used, and lubricating particles are added into the high polymer material, so that the friction coefficient of the high polymer material is reduced; or the material is formed by splicing the two polymer materials (1) and (2), namely the material (1) at the far end and the material (2) at the near end, and the materials are connected and fixed in a mode such as thermal welding, laser welding, resistance welding and the like.

In use, as shown in fig. 1, the embolic delivery system provided in this embodiment, when the inner diameter of the delivery catheter is smaller than the outer diameter of the primary protective sheath 2, comprises the following steps: the distal end of the first protective sheath 2 is butted to the catheter seat, then the plug 3 positioned in the first accommodating cavity is pushed out from the distal end of the first protective sheath 2 by the pushing device 1, the plug 3 is further led into the first conveying catheter 4, the pushing device 1 is further pushed, the plug 3 is conveyed in the first conveying catheter 4, and finally the focus position of a human body is reached.

As shown in fig. 2, when the inner diameter of the employed delivery catheter is larger than the outer diameter of the primary protective sheath 2, the steps of:

disposing the pushing device 1 and the plug 3 in the primary accommodation cavity of the primary protective sheath 2;

at the proximal end of the primary protective sheath 2, relatively fixing the pushing device 1 and the primary protective sheath 2;

inserting the distal end of the primary protective sheath 2 into a delivery catheter and extending into a lesion site of a human body along the delivery catheter;

after the distal end of the first protective sheath 2 reaches the focus position of the human body, the relative fixation of the pushing device 1 and the first protective sheath 2 is released, and the embolism 3 is conveyed to the focus position of the human body from the distal end of the first protective sheath 2 through the pushing device 1.

The embolic delivery system provided in this embodiment achieves the purpose that one embolic 3 can be compatible with multiple delivery catheters simultaneously, and can greatly reduce the time and cost for a doctor to exchange delivery catheters.

Example 2

As shown in fig. 9, for a specific implementation manner of the embolic delivery system provided in this embodiment, on the basis of embodiment 1, the embolic delivery system further includes: a secondary protective sheath 7. The second protective sheath 7 is provided with a second accommodating cavity, the first protective sheath 2 is inserted into the second accommodating cavity in a sliding way, the outer diameter of the second protective sheath 7 is larger than the inner diameter of the second conveying catheter 5, and the inner diameter of the second accommodating cavity is matched with the inner diameter of the second conveying 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.

As shown in fig. 9, in the embolic delivery system provided in this embodiment, when the second delivery catheter 5 is used for delivery, the embolic delivery system includes the following steps:

the distal end of the second protective sheath 7 is first butt-jointed to the catheter hub of the second delivery catheter 5, so that the second protective sheath 7 plays a supporting role to ensure the stability of the first protective sheath 2 when being pushed.

The first protective sheath 2 is then advanced into the second delivery catheter 5, thereby carrying the plug 3 and the pushing device 1 along said second delivery catheter 5.

The embolization further, when delivered using the second delivery catheter 5, comprises the steps of:

The second fixing means 9 (removed and therefore not shown) at the proximal end of the first and second protective sheaths 2, 7 are then removed, and the first protective sheath 2 is advanced into the second delivery catheter 5, thereby carrying the plug 3 and the pushing device 1 along said second delivery catheter 5.

When the embolism 3 and the first protective sheath 2 reach the focus position, 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 to reach the focus position of the human body through the pushing device 1.

As shown in fig. 10, in the embolic delivery system provided in this embodiment, when the first delivery catheter 4 is used for delivery, the embolic delivery system includes the following steps:

the first protective sheath 2 is first pushed out of the distal end of the second protective sheath 7, pushing out the second protective sheath 7.

The distal end of the primary protective sheath 2 is then coupled to the catheter hub of the primary delivery catheter 4.

And pushing out the embolism 3 from the first protective sheath 2 by the pushing device 1, so that the embolism 3 enters the first conveying catheter 4 and enters the focus position of the human body along the first conveying catheter 4.

Further, when the first delivery catheter 4 is used for delivery, the method comprises the following steps:

the first protective sheath 2 and the second protective sheath 7 are assembled, the distal end portion of the first protective sheath 2 is pushed out of the second protective sheath 7, and a second fixing device 9 is installed between the first protective sheath 2 and the second protective sheath 7. The distal end of the primary protective sheath 2 is then coupled to the catheter hub of the primary delivery catheter 4.

The first protective sheath 2 and the first securing means 6 (removed and therefore not shown) proximal to the pusher 1 are removed, and the plug 3 is pushed out of the first protective sheath 2 by the pusher 1, allowing the plug 3 to enter the first delivery catheter 4 and along the first delivery catheter 4 into the lesion site of the human body.

In this embodiment, the hardness of the second protective sheath 7 is greater than the hardness of the first protective sheath 2. With this arrangement, the first protective sheath 2 can be ensured to be smoothly conveyed within the second protective sheath 7. Of course, this is not limiting, and in some alternative embodiments the hardness of the primary protective sheath 2 and the secondary protective sheath 7 may be the same.

As shown in fig. 11, in the embolic delivery system provided in this embodiment, the outer diameter of the second protective sheath 7 is matched with the inner diameter of the third delivery catheter 8; that is, in the embolic delivery system provided in the present embodiment, the inner diameter of the second accommodation chamber of the second delivery catheter 5 is matched with the inner diameter of the second delivery catheter 5, and the outer diameter of the second delivery catheter 5 is matched with 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 third delivery catheter 8 and is moved toward the lesion site by the guidance of the third delivery catheter 8.

Specifically, when the third delivery catheter 8 is used for delivery, the method comprises the following steps:

first, the proximal ends of the first protective sheath 2, the pushing device 1 and the second protective sheath 7 are relatively fixed by the first fixing device 6 and the second fixing device 9.

The distal end of the second protective sheath 7 is then inserted into the third delivery catheter 8 and extended into the lesion site of the human body along the third delivery catheter 8.

When the distal end of the second protecting sheath 7 reaches the focus position of the human body, the pushing device 1 and the first fixing device 6 at the proximal end of the first protecting sheath 2 are released, and the embolism 3 is conveyed to the focus position of the human body from the distal end of the first protecting sheath 2 through the pushing device 1.

As shown in fig. 11, in the embolic delivery system provided in this embodiment, a second fixing device 9 is disposed between the proximal end of the second protecting sheath 7 and the first protecting sheath 2. The second fixing device 9 is used for relatively fixing the first protective sheath 2 and the second protective sheath 7, so that the first protective sheath 2 and the second protective sheath 7 can not move in the process of being conveyed in the conveying catheter together. The second fixing device 9 and the first fixing device 6 may have the same structure, and will not be described herein.

With the above arrangement, when the second protective sheath 7 extends into the focus position of the human body along the delivery catheter, if the second protective sheath 7 extends into the delivery catheter completely, the distal end of the second protective sheath 7 can not reach the focus position of the human body, it is also possible to: the second fixing device 9 at the proximal ends of the first protective sheath 2 and the second protective sheath 7 is released, and the first protective sheath 2 continues to extend into the focus position of the human body along the delivery catheter. When the distal end of the first protecting sheath 2 reaches the focus position of the human body, the first fixing device 6 at the proximal ends of the pushing device 1 and the first protecting sheath 2 is released, and the embolism 3 is conveyed to the focus position of the human body from the distal end of the first protecting sheath 2 through the pushing device 1.

The uses of the first, second, and third transfer catheters 4, 5, and 8 in the present embodiment are not particularly limited, and may be micro catheters or the like.

In addition, in this embodiment, the second protective sheath 7 may have developability, and specific implementations include, but are not limited to: developing materials such as barium sulfate, bismuth oxide, tungsten powder and the like are added into the polymer material particles so as to develop the whole body after molding; or, the head end of the second protective sheath tube 7 is provided with a developing ring by forging and pressing at a position of 0-2cm, and the developing ring is made of materials with developing properties such as Pt/Ir; or the head end of the second protective sheath tube 7 is heat-shrunk by a heat shrink tube with a section of developing material added at the position of 0-2 cm.

In the present embodiment, the second protective sheath 7 satisfies the low friction coefficient, the overbending property and the supportability, and the realization ways of satisfying the above properties include, but are not limited to: (1) a high polymer material with a low friction coefficient and good supporting property, such as PTFE, HDPE, POM, is used for stretching and reducing the head end of the material, so that the material has good passing property; (2) the high polymer material with good bending performance and certain supporting property, such as Pebax, nylon and the like, is used, and lubricating particles are added into the high polymer material, so that the friction coefficient of the high polymer material is reduced; or the material is formed by splicing the two polymer materials (1) and (2), namely the material (1) at the far end and the material (2) at the near end, and the materials are connected and fixed in a mode such as thermal welding, laser welding, resistance welding and the like.

In addition, in the above embodiment, the distal end refers to an end far from the operator, and the proximal end refers to an end near the operator.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.

Claims

1. An embolic delivery system for cooperation with a plurality of delivery catheters of different inner diameters, the embolic delivery system comprising: the novel medical device comprises a pushing device (1) and a first protection sheath tube (2), wherein a first accommodating cavity for accommodating a plug (3) is formed in the first protection sheath tube (2), the pushing device (1) is arranged in the first accommodating cavity in a sliding mode, and the distal end head of the first protection sheath tube (2) is made of a high polymer material.

2. Embolic delivery system according to claim 1, wherein the outer diameter of the first protective sheath (2) is larger than the inner diameter of the first delivery catheter (4), the inner diameter of the first receiving lumen matching the inner diameter of the first delivery catheter (4); when the first conveying catheter (4) is adopted for conveying, the first protective sheath (2) is supported at the proximal end of the first conveying catheter (4).

3. Embolic delivery system according to claim 1, wherein the outer diameter of the first protective sheath (2) matches the inner diameter of the second delivery catheter (5); when the second conveying catheter (5) is adopted for conveying, the first protective sheath (2) stretches into the second conveying catheter (5) and moves towards the focus position through the guide of the second conveying catheter (5).

4. An embolic delivery system according to claim 3, wherein a first fixation device (6) is provided between the proximal end of the first protective sheath (2) and the pusher (1).

5. Embolic delivery system according to claim 4, wherein the first fixation device (6) is a fixation sleeve with different inner diameters at both ends.

6. The embolic delivery system of claim 3, further comprising: a second protection sheath (7), wherein the second protection sheath (7) is provided with a second accommodating cavity, the first protection sheath (2) is inserted in the second accommodating cavity in a sliding way, the outer diameter of the second protection sheath (7) is larger than the inner diameter of the second conveying catheter (5), and the inner diameter of the second accommodating cavity is matched with the inner diameter of the second conveying catheter (5); the second protective sheath (7) is supported at the proximal end of the second delivery catheter (5) when delivering with the second delivery catheter (5).

7. The embolic delivery system of claim 1, further comprising: the second protection sheath tube (7), the second protection sheath tube (7) is provided with a second containing cavity, the first protection sheath tube (2) is inserted in the second containing cavity in a sliding way, and the outer diameter of the second protection sheath tube (7) is matched with the inner diameter of the third conveying catheter (8); when the third conveying catheter (8) is adopted for conveying, the second protective sheath (7) stretches into the third conveying catheter (8) and moves towards the focus position through the guide of the third conveying catheter (8).

8. Embolic delivery system according to claim 6 or 7, wherein the hardness of the second protective sheath (7) is greater than the hardness of the first protective sheath (2).

9. Embolic delivery system according to claim 6 or 7, wherein the first protective sheath (2) and/or the second protective sheath (7) are developable.

10. Embolic delivery system according to claim 6 or 7, wherein the second protective sheath (7) is polymeric material at least at the distal head.

11. Embolic delivery system according to claim 10, wherein the distal end and the proximal end of the first protective sheath (2) and/or the second protective sheath (7) are made of different polymeric materials, and wherein the two polymeric materials are spliced.

12. Embolic delivery system according to claim 11, wherein lubricating particles are added within the polymeric material proximal to the first protective sheath (2) and/or the second protective sheath (7).

13. Embolic delivery system according to claim 6 or 7, wherein a second fixation device (9) is provided between the proximal end of the second protective sheath (7) and the first protective sheath (2).

14. Embolic delivery system according to claim 13, wherein the second fixation device (9) is a fixation sleeve with different inner diameters at both ends.

15. Embolic delivery system according to claim 5 or 14, wherein the smaller inner diameter end (11) of the fixation sleeve has an openable structure (10).