Pre-expanding balloon assembly for preventing thrombus from falling

Abstract

The utility model discloses a pre-dilation balloon assembly capable of preventing thrombus from falling, which belongs to the technical field of pre-dilation balloons and comprises an outer sleeve, and a first channel is arranged in the outer sleeve. The guide pipe is movably arranged in the first channel, and a second channel is arranged in the guide pipe; the inflating balloon is arranged at the front end of the catheter; the number of the filter screens is two, and the inflatable balloon is arranged between the two filter screens; when the first filter screen and the second filter screen move out of the outer sleeve, the first filter screen and the second filter screen can be unfolded in the radial direction. According to the pre-expanding balloon assembly designed by the utility model, the two filter screens are suitable for capturing fallen plaques or thrombus when the inflating balloon expands a blood vessel, and the plaques or thrombus are prevented from entering blood circulation to block other parts of the blood vessel, so that the phenomenon of no re-flow after an operation is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of pre-expansion balloons, and in particular relates to a pre-expansion balloon component for preventing thrombus from falling. Background Art

[0002] In related technologies, pre-expansion balloons can expand narrowed areas of blood vessels, making the originally narrow blood vessel channels wider, so that the blood in the blood vessels can circulate normally. In existing technologies, when the pre-expansion balloon is used to expand the thrombus in the blood vessel, the thrombus or calcified plaque will be squeezed and fall off. The detached thrombus or plaque enters the blood circulation and may cause blockage in other parts of the blood vessel, thereby leading to no reflow after surgery. Utility Model Content

[0003] The present invention aims to address at least one of the technical problems existing in the prior art. To this end, one objective of the present invention is to provide a thrombus-preventing pre-dilation balloon assembly. The thrombus-preventing pre-dilation balloon assembly designed in this invention features two filters adapted to capture dislodged plaque or thrombus during the balloon's expansion, preventing it from entering the blood circulation and potentially blocking other areas of the vessel, thereby preventing post-operative no-reflow.

[0004] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions:

[0005] The utility model provides a pre-expansion balloon assembly for preventing thrombus from falling, comprising: an outer sleeve, a first channel being provided in the outer sleeve; a catheter, the catheter being movably provided in the first channel, and a second channel being provided in the catheter; an inflatable balloon, the inflatable balloon being provided at the front end of the catheter; a filter screen, the filter screen being constructed in two, the two filter screens being connected to the catheter respectively, and the two filter screens being spaced apart along the extension direction of the catheter, and the inflatable balloon being provided between the two filter screens; wherein when the first filter screen and the second filter screen are moved to the outside of the outer sleeve, the first filter screen and the second filter screen can be expanded in the radial direction.

[0006] According to the anti-thrombus falling pre-expansion balloon assembly of the present invention, by arranging filter screens at both ends of the inflated balloon, and both filter screens are suitable for capturing detached plaques or thrombi when the inflated balloon expands the blood vessels, the detached plaques or thrombi when the blood vessels expand can be effectively captured, thereby preventing the plaques or thrombi from entering the blood circulation and blocking other parts of the blood vessels, thereby avoiding the no-reflow phenomenon after surgery.

[0007] Furthermore, the two filters are respectively a first filter and a second filter, and the first filter is located at the front end of the inflatable balloon; wherein the aperture of the first filter is larger than the aperture of the second filter.

[0008] Furthermore, the pore size of the first filter is d1, which satisfies: 70um≤d1≤150um; the pore size of the second filter is d2, which satisfies: 25um≤d2≤75um.

[0009] Furthermore, the first filter screen and the second filter screen are both films made of polymer materials.

[0010] Furthermore, it also includes: a bracket, which is constructed in two parts, one of which is suitable for connecting the conduit with the first filter screen, and the bracket is suitable for driving the first filter screen to expand radially; the other bracket is suitable for connecting the conduit with the second filter screen, and the bracket is suitable for driving the second filter screen to expand radially.

[0011] Furthermore, the bracket includes: a plurality of steel cables, one ends of which are respectively connected to the conduit; a circular ring, which is constructed to correspond one-to-one with the plurality of steel cables, and the plurality of circular rings are respectively connected to the other ends of the corresponding steel cables; wherein the circular ring is used to drive the first filter screen or the second filter screen to expand radially.

[0012] Furthermore, the bracket further comprises: an elastic ring, which is arranged at the rear end of the first filter screen and / or the second filter screen, and the elastic ring is connected to the conduit via a soft rope.

[0013] Furthermore, the ring and the steel cable are made of nickel-titanium alloy.

[0014] Other advantages, objectives, and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or they may be taught by those skilled in the art from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention is described with the following drawings:

[0016] Figure 1 This is a schematic diagram of the inflatable balloon, the first filter screen, and the second filter screen of the present invention being moved outside the outer sleeve;

[0017] Figure 2 This is a schematic diagram of the cooperation between the conduit and the first filter screen of the present invention;

[0018] Figure 3 This is a schematic diagram of the cooperation between the conduit, the steel cable and the ring of the present invention.

[0019] The following are marked in the accompanying drawings:

[0020] 1. Pre-expansion balloon assembly;

[0021] 10. Outer cannula; 20. Catheter; 30. Inflatable balloon;

[0022] 41. First filter; 42. Second filter;

[0023] 51. Steel cable; 52. Ring; 53. Elastic ring; 54. Soft rope. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The schematic implementation methods of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0025] In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention. However, it will be apparent to one skilled in the art that these specific details are not necessarily required to practice the present invention. In other instances, well-known structures, circuits, materials, or methods are not described in detail to avoid obscuring the present invention.

[0026] Throughout this specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment," "an embodiment," "an example," or "an example" appearing in various places throughout this specification do not necessarily refer to the same embodiment or example. In addition, the particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combination and / or subcombination. Furthermore, it will be understood by those of ordinary skill in the art that the figures provided herein are for illustrative purposes only and are not necessarily drawn to scale. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0027] In the description of the present invention, it should be understood that the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention.

[0028] Example 1:

[0029] like Figure 1-Figure 3As shown, the utility model provides a thrombus-preventing pre-expansion balloon assembly 1, comprising: an outer sleeve 10, a catheter 20, an inflation balloon 30 and a filter screen. A first channel is provided in the outer sleeve 10, and the catheter 20 is movably provided in the first channel. A second channel is provided in the catheter 20, and the inflation balloon 30 is provided at the front end of the catheter 20. The filter screen is constructed in two, and the two filter screens are respectively connected to the catheter 20, and the two filter screens are spaced apart along the extension direction of the catheter 20, and the inflation balloon 30 is provided between the two filter screens; wherein when the first filter screen 41 and the second filter screen 42 move to the outside of the outer sleeve 10, the first filter screen 41 and the second filter screen 42 can be expanded in the radial direction.

[0030] In some embodiments, a first channel is provided inside the outer sleeve 10, and the first channel is used to accommodate the catheter 20, the inflatable balloon 30 and the filter. The catheter 20 is movably provided in the first channel of the outer sleeve 10. A second channel is provided inside the catheter 20, and the second channel is used to transport gas to make the inflatable balloon 30 expand radially. The inflatable balloon 30 is provided at the front end of the catheter 20 and is used to expand the narrowed blood vessels. The filter structure is composed of two, and the two filters are respectively connected to the catheter 20 and are spaced apart along the extension direction of the catheter 20. The inflatable balloon 30 is provided between the two filters.

[0031] It is understood that the outer sleeve 10 provides a stable first channel, allowing the catheter 20 to move within the first channel, thereby making the catheter 20 more stable during insertion and operation. The catheter 20 is introduced into the blood vessel through the first channel of the outer sleeve 10. At this time, the filter and the inflation balloon 30 are both located within the outer sleeve 10 to prevent the filter from prematurely deploying and damaging the blood vessel. When the catheter 20 is in place, the outer sleeve 10 is moved outward, allowing the two filters and the inflation balloon 30 to break free from the constraints of the outer sleeve 10. The two filters automatically deploy radially with the help of a spring-loaded mechanism. Medical personnel then inject gas into the second channel to cause the inflation balloon 30 to deploy radially.

[0032] It is worth noting that the balloon expands in the radial direction (balloon inflates) and dilates the narrowed blood vessels. When the narrowed blood vessels are expanded, plaques or thrombi may fall off. At this time, the filters located at both ends of the inflated balloon 30 are suitable for capturing plaques or thrombi, thereby preventing plaques or thrombi from entering the blood circulation.

[0033] After the operation is completed, the outer tube 10 is moved inward so that the two filters and the inflation balloon 30 are re-stored into the first channel, and then the pre-expansion balloon assembly 1 is taken out.

[0034] According to the anti-thrombus falling pre-expansion balloon assembly 1 of the present invention, by arranging filter screens at both ends of the inflatable balloon 30, and both filter screens are suitable for capturing detached plaques or thrombi when the inflated balloon 30 expands the blood vessels, the detached plaques or thrombi can be effectively captured when the blood vessels expand, thereby preventing the plaques or thrombi from entering the blood circulation and blocking other parts of the blood vessels, thereby avoiding the no-reflow phenomenon after surgery.

[0035] Example 2:

[0036] In this embodiment, based on the first embodiment, the two filters are a first filter 41 and a second filter 42 . The first filter 41 is located at the front end of the inflatable balloon 30 . The aperture of the first filter 41 is larger than that of the second filter 42 .

[0037] It can be understood that the first filter 41 is located at the front end of the inflatable balloon 30, the second filter 42 is located at the rear end of the inflatable balloon 30, and the aperture of the first filter 41 is larger than the aperture of the second filter 42. By setting the first filter 41 and the second filter 42 with different apertures, plaques or thrombi of different sizes can be more effectively captured, thereby improving the filtering effect.

[0038] When the catheter 20 is in place, the outer tube 10 is moved outward, so that the first filter 41, the inflatable balloon 30 and the second filter 42 are successively released from the restriction of the outer tube 10. The first filter 41 and the second filter 42 are automatically expanded in the radial direction with the help of a spring-loaded mechanism. The medical staff allows the inflatable balloon 30 to expand in the radial direction by introducing gas into the second channel.

[0039] When the inflatable balloon 30 is expanded radially to dilate the narrowed blood vessel, the first filter 41 is located at the front end of the inflatable balloon 30, and the first filter 41 can capture larger plaques or thrombi, and the second filter 42 is located at the rear end of the inflatable balloon 30, and the second filter 42 can capture smaller plaques or thrombi. In this way, plaques or thrombi of different sizes can be captured, preventing plaques or thrombi from entering the blood circulation and blocking other parts of the blood vessels, thereby reducing the risk of complications such as embolism.

[0040] At the same time, since larger blood clots or impurities will be blocked by the first filter 41, the risk of clogging of the second filter 42 is reduced. Therefore, the above setting can extend the service life of the first filter 41 and the second filter 42, thereby extending the service life of the pre-expansion balloon assembly 1.

[0041] It is worth noting that the different aperture designs of the first filter 41 and the second filter 42 achieve the effect of graded filtration. The first filter 41 serves as a primary filter, blocking most of the larger blood clots; the second filter 42 serves as a fine filter, further capturing smaller blood clots or impurities.

[0042] The graded filtration design makes the pre-expansion balloon assembly 1 more convenient and safer during operation. Medical staff can choose to use a single filter or two filters at the same time according to actual needs to meet different treatment needs. At the same time, due to the difference in pore size between the first filter 41 and the second filter 42, the pre-expansion balloon assembly 1 can better adapt to thrombi of different sizes and types, thereby improving the flexibility and success rate of treatment.

[0043] According to some embodiments of the present invention, the pore size of the first filter screen 41 is d1, which satisfies: 70um≤d1≤150um; the pore size of the second filter screen 42 is d2, which satisfies: 25um≤d2≤75um.

[0044] It can be understood that the pore size range of the first filter 41 is 70um to 150um, so that the first filter 41 can effectively block larger blood clots or impurities, and at the same time will not cause the first filter 41 to be easily blocked due to being too fine; the pore size range of the second filter 42 is 25um to 75um, and the second filter 42 can further capture smaller-sized blood clots or impurities, thereby ensuring the cleanliness and patency of the blood vessels.

[0045] According to some embodiments of the present invention, the first filter screen 41 and the second filter screen 42 are both films made of polymer materials.

[0046] It can be understood that the polymer material film has excellent flexibility and plasticity, so that the first filter 41 and the second filter 42 can be easily curled or unfolded to adapt to different usage environments and operating requirements; of course, the polymer material film can be made into a filter with a specific pore size through microporous processing technology. These micropores can accurately control the permeability of blood clots or impurities to achieve an efficient filtration effect; at the same time, the surface of the polymer material film is smooth and not easy to adhere to blood clots or impurities, which helps to keep the filter clean and unobstructed.

[0047] It should be noted that polymer materials generally have good biocompatibility, that is, the first filter 41 and the second filter 42 will not cause adverse reactions or rejection reactions when they come into contact with human tissue or blood. Therefore, the anti-thrombosis pre-expansion balloon assembly 1 of the present application will not cause damage to the patient's blood vessels or surrounding tissues during use, ensuring the safety and reliability of the treatment.

[0048] Example 3:

[0049] In this embodiment, based on the second embodiment, the pre-expansion balloon assembly 1 further includes: a stent, which is constructed in two parts, one of which is suitable for connecting the catheter 20 with the first filter 41, and is suitable for driving the first filter 41 to expand radially; the other stent is suitable for connecting the catheter 20 with the second filter 42, and is suitable for driving the second filter 42 to expand radially.

[0050] It can be understood that the design of the bracket provides a stable support structure for the first filter 41 and the second filter 42, ensuring the stability and reliability of the first filter 41 and the second filter 42 during the deployment process. By connecting the bracket to the catheter 20, it can be ensured that the first filter 41 and the second filter 42 will not be detached or misplaced during the movement, thereby ensuring the overall performance of the pre-expansion balloon assembly 1.

[0051] The deployment mechanism of the stent allows the first filter 41 and the second filter 42 to be deployed quickly and evenly after reaching the predetermined position, so that the first filter 41 and the second filter 42 cover a larger blood vessel area, thereby improving the efficiency of the filter in capturing thrombus and reducing the risk of missing thrombus due to incomplete deployment of the first filter 41 and the second filter 42.

[0052] It is worth noting that the introduction of the stent simplifies the operation process of deploying the first filter 41 and the second filter 42. The doctor only needs to control the position and movement speed of the catheter 20 to achieve the deployment and contraction of the first filter 41 and the second filter 42, which not only reduces the complexity of the operation, but also improves the efficiency and success rate of the operation.

[0053] Example 4:

[0054] In this embodiment, based on the third embodiment, the bracket includes: multiple steel cables 51 and circular rings 52, one ends of the multiple steel cables 51 are respectively connected to the catheter 20, and the circular rings 52 are constructed to correspond one to one with the multiple steel cables 51, and the multiple circular rings 52 are respectively connected to the other ends of the corresponding steel cables 51; wherein the circular rings 52 are used to drive the first filter screen 41 or the second filter screen 42 to expand in the radial direction.

[0055] It can be understood that the steel cable 51 serves as a bridge connecting the catheter 20 and the ring 52. The steel cable 51 provides the necessary rigidity and stability to ensure that the stent will not break or deform during the deployment process. The ring 52 is connected to the steel cable 51. When the catheter 20 moves in the blood vessel, the ring 52 will move with it. When the first filter 41 or the second filter 42 is moved to the outside of the outer tube 10, the ring 52 will be forced to deploy due to the diameter limitation of the blood vessel, thereby driving the first filter 41 or the second filter 42 connected thereto to also deploy radially.

[0056] According to some embodiments of the present invention, the stent further includes an elastic ring 53 disposed at the rear end of the first filter 41 and / or the second filter 42, and connected to the catheter 20 via a soft cord 54. It will be appreciated that the front ends of the first filter 41 and the second filter 42 are both open due to the opening of the circular ring 52 on the stent, facilitating blood flow, while the rear ends of the first filter 41 and the second filter 42 are brought together by the elastic ring 53 to achieve a closed position, thereby trapping blood clots within the first filter 41 or the second filter 42.

[0057] According to some embodiments of the present invention, the material of the ring 52 and the steel cable 51 is nickel-titanium alloy. It can be understood that nickel-titanium alloy is the most commonly used material for implantation in the body, has high biosafety, and the metal has memory. Therefore, the ring 52 can be retracted into the first channel after compression and deformation, and after leaving the first channel, the ring 52 can restore its original shape by virtue of the metal memory to drive the first filter 41 or the second filter 42 to expand radially.

[0058] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A thrombus-preventing pre-expansion balloon assembly, characterized in that: include: an outer sleeve (10), wherein a first channel is provided in the outer sleeve (10); a conduit (20), the conduit (20) being movably disposed in the first channel, and a second channel being disposed in the conduit (20); an inflatable balloon (30), the inflatable balloon (30) being arranged at the front end of the catheter (20); A filter screen, wherein the filter screen is constructed in two parts, the two filter screens are respectively connected to the catheter (20), and the two filter screens are spaced apart along the extension direction of the catheter (20), and the inflatable balloon (30) is arranged between the two filter screens; wherein the two filter screens are respectively a first filter screen (41) and a second filter screen (42); When the first filter screen (41) and the second filter screen (42) are moved to the outside of the outer sleeve (10), the first filter screen (41) and the second filter screen (42) can be expanded in the radial direction.

2. The anti-thrombosis falling pre-expansion balloon assembly according to claim 1, characterized in that: The two filter screens are respectively a first filter screen (41) and a second filter screen (42), wherein the first filter screen (41) is located at the front end of the inflatable balloon (30); in The pore size of the first filter screen (41) is larger than the pore size of the second filter screen (42).

3. The anti-thrombosis falling pre-expansion balloon assembly according to claim 2, characterized in that: The aperture of the first filter (41) is d1, which satisfies: 70um≤d1≤150um; The aperture of the second filter (42) is d2, which satisfies: 25um≤d2≤75um.

4. The anti-thrombosis falling pre-expansion balloon assembly according to claim 3, characterized in that: The first filter screen (41) and the second filter screen (42) are both thin films made of polymer materials.

5. The anti-thrombosis falling pre-expansion balloon assembly according to claim 3, characterized in that: Also includes: The bracket is constructed in two parts, one of which is suitable for connecting the conduit (20) with the first filter screen (41), and the bracket is suitable for driving the first filter screen (41) to expand in the radial direction; the other bracket is suitable for connecting the conduit (20) with the second filter screen (42), and the bracket is suitable for driving the second filter screen (42) to expand in the radial direction.

6. The anti-thrombosis falling pre-expansion balloon assembly according to claim 5, characterized in that: The bracket comprises: a plurality of steel cables (51), one end of each of the plurality of steel cables (51) being connected to the conduit (20); A circular ring (52), wherein the circular ring (52) is constructed to correspond one-to-one with the plurality of steel cables (51), and the plurality of circular rings (52) are respectively connected to the other end of the corresponding steel cables (51); wherein The circular ring (52) is used to drive the first filter screen (41) or the second filter screen (42) to expand in the radial direction.

7. The anti-thrombosis falling pre-expansion balloon assembly according to claim 6, characterized in that: The bracket further comprises: An elastic ring (53) is provided at the rear end of the first filter screen (41) and / or the second filter screen (42), and the elastic ring (53) is connected to the conduit (20) via a soft rope (54).

8. The anti-thrombosis falling pre-expansion balloon assembly according to claim 7, characterized in that: The ring (52) and the steel cable (51) are made of nickel-titanium alloy.

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