Balloon dilatation catheter

Abstract

The present application relates to a kind of balloon dilatation catheter, including balloon, inner tube, outer tube, liquid guide component and support assembly, liquid guide component is sleeved on the outside of inner tube, its proximal end is connected on the proximal end pin of outer tube and / or balloon and is formed with gas storage passage between proximal end pin, distal end stretches into balloon distal end and forms liquid guide cavity between inner tube;Support assembly includes first support component between liquid guide component and inner tube and allows the passage of filling liquid.By setting liquid guide component, filling liquid flows into balloon from balloon distal end, avoid the aggregation of air at the distal end of balloon and affect the distal end development, while configuring gas storage passage in the proximal end of balloon, air that is driven to the proximal end of balloon is gathered in gas storage passage, and proximal end development is not affected;The present application also passes through the design of the groove of inner tube and support assembly, so that the filling liquid in balloon can be smoothly extracted, and it is beneficial to the back embrace of balloon, and the balloon is conveniently taken out.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of medical devices, and particularly relates to a balloon dilatation catheter. BACKGROUND

[0002] The existing balloon dilatation catheter generally comprises a balloon, a catheter and a catheter seat. Before use, the air in the balloon is pumped out, and then a filling liquid (such as a developing liquid) is introduced into the balloon to expand the balloon. However, due to the problem of the size of the balloon itself being too large or operation, the air in the balloon cannot be completely pumped out before filling, and a small amount of air is accumulated at the distal end, which causes the inner tube at the distal end of the balloon to be unable to be completely soaked in the developing liquid, so that it cannot be developed under X-ray, which is easy to cause the medical staff to make a mistake in use, especially for large-diameter, super-long balloon products, it is more difficult to pump out the air.

[0003] Patent CN 113018652 A discloses a liquid-guiding balloon dilatation catheter, which can change the existing structure of the air pumping out in the body to be performed in the body by simultaneously arranging an injection port and a discharge port in the balloon body. However, the air in the balloon cannot be completely pumped out, and the air will inevitably accumulate at the proximal end of the balloon, which will still affect the development, and because the catheter is flexible, the catheter will be dry due to negative pressure when the liquid is pumped back, and the balloon cannot be withdrawn. SUMMARY

[0004] The purpose of the present application is to provide a new type of balloon dilatation catheter, which has better development effect, and the balloon has good withdrawal property.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is:

[0006] A balloon dilatation catheter comprises:

[0007] A balloon, which has an expanded state and a contracted state, comprises a balloon main body, a distal end tube foot and a proximal end tube foot arranged at the distal end and the proximal end of the balloon main body, respectively;

[0008] An inner tube, the distal end of which penetrates through the balloon main body and is connected with the distal end tube foot, and a plurality of axially extending grooves are arranged on the outer wall of the part of the inner tube located in the balloon main body;

[0009] An outer tube, which is arranged outside the inner tube and has its distal end connected with the proximal end tube foot, and a filling cavity is formed between the outer tube and the inner tube, which is used for transmitting the filling liquid to drive the state conversion of the balloon;

[0010] A liquid guiding member is sleeved outside the inner tube, a proximal end of the liquid guiding member is connected to the outer tube and / or the proximal end tube leg, and a gas storage channel is formed between the proximal end tube leg and the liquid guiding member, a distal end of the liquid guiding member extends into a distal end of the balloon body and forms a liquid guiding cavity with the inner tube, and the liquid guiding cavity is in communication with the filling cavity;

[0011] A support assembly includes a first support member arranged between the liquid guiding member and the inner tube and allowing the filling liquid to pass through.

[0012] The present application sets the liquid guiding member, so that the filling liquid flows out of the distal end of the balloon and flows to the proximal end after being guided by the liquid guiding member, avoids the accumulation of air at the distal end of the balloon and affects the distal end imaging, and at the same time, the gas storage channel is arranged at the proximal end of the balloon, so that the air driven to the proximal end of the balloon is accumulated in the gas storage channel and does not affect the proximal end imaging. The present application also opens a slot on the inner tube and sets a support assembly to prevent the liquid guiding tube from being adsorbed on the inner tube under pressure during backflow and affecting the backflow of the filling liquid, so that the filling liquid in the balloon can be smoothly backflowed, thereby facilitating the contraction of the balloon and the removal of the balloon.

[0013] Preferably, the first support member is a mesh-shaped support. When the filling liquid in the balloon is backflowed, the liquid guiding member will be shrunk due to negative pressure, thereby being adsorbed on the inner tube and affecting the passage of the filling liquid. The mesh-shaped support is arranged between the inner tube and the liquid guiding member, so that the liquid guiding member has a space with the slot of the inner tube, thereby facilitating the passage of the filling liquid.

[0014] Preferably, a distal end of the first support member is flush with or extends from the liquid guiding member.

[0015] In some embodiments, the first support member is made of stainless steel.

[0016] Preferably, the support assembly further includes a second support member arranged at the proximal end of the liquid guiding member, the second support member is a mesh-shaped support and separates the proximal end tube leg and the liquid guiding member to form the gas storage channel. The second support member provides support for the air bubble accumulation space at the proximal end of the balloon and provides support for the installation (such as welding) of the liquid guiding member and the outer tube and / or the proximal end tube leg.

[0017] Preferably, a distal end of the second support member overlaps with a proximal end of the first support member in a horizontal plane, or the distal end of the second support member is flush with the proximal end of the first support member.

[0018] In some embodiments, the second support member is made of stainless steel.

[0019] Preferably, the part of the liquid guiding member located inside the balloon body has a folded state of being wound on the inner tube and an expanded state of being expanded outward.

[0020] Further preferably, when the part of the liquid guiding member located inside the balloon body is in the folded state, it is folded into multiple petals.

[0021] In some embodiments, the liquid guiding member is folded into three petals. The liquid guiding member is folded and wound to facilitate the folding and winding of the balloon.

[0022] Preferably, the material of the liquid guiding member is nylon.

[0023] Preferably, the plurality of grooves are arranged around the axis of the inner tube.

[0024] Preferably, the length of the proximal tube foot in the axial direction is greater than the length of the distal tube foot in the axial direction.

[0025] Preferably, the balloon dilation catheter further comprises a development ring sleeved outside the inner tube, the development ring having two parts arranged at the distal and proximal ends of the balloon body.

[0026] Thanks to the above technical solution, the present application has the following advantages compared with the prior art:

[0027] By arranging the liquid guiding member, the filling liquid is guided by the liquid guiding member and flows out from the distal end of the balloon and flows to the proximal end, avoiding the accumulation of air at the distal end of the balloon and affecting the development of the distal end, while the air driven to the proximal end of the balloon is accumulated in the air storage channel, which does not affect the development of the proximal end, and the user's use is better.

[0028] The present application also designs the grooves of the inner tube and the support assembly, so that the filling liquid in the balloon can be smoothly withdrawn, which is beneficial to the retraction of the balloon and facilitates the removal of the balloon. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0030] Figure 1 The structure diagram of the balloon dilation catheter of embodiment 1 is shown in the figure.

[0031] Figure 2 The structure diagram of the distal end part of the balloon dilation catheter of embodiment 1 is shown in the figure.

[0032] Figure 3Structure diagram of the balloon dilatation catheter of Example 1 filled with a filling liquid;

[0033] Figure 4 Structure diagram of the balloon dilatation catheter of Example 1 filled with a filling liquid; Figure 3 Enlarged diagram of part A in the middle;

[0034] Figure 5 Structure diagram of the balloon dilatation catheter of Example 1 filled with a filling liquid; Figure 3 Enlarged diagram of part B in the middle;

[0035] Figure 6 Structure diagram of the balloon dilatation catheter of Example 1 filled with a filling liquid;

[0036] Figure 7 Structure diagram of the balloon dilatation catheter of Example 1 filled with a filling liquid;

[0037] Figure 8 Structure diagram of the balloon dilatation catheter of Example 1 filled with a filling liquid; Figure 7 Enlarged diagram of part C in the middle;

[0038] Figure 9 Structure diagram of the balloon dilatation catheter of Example 1 filled with a filling liquid;

[0039] Figure 10 Structure diagram of the balloon dilatation catheter of Example 1 filled with a filling liquid; Figure 7 Structure diagram of the balloon dilatation catheter of Example 1 filled with a filling liquid; Figure 8 Structure diagram of the balloon dilatation catheter of Example 1 filled with a filling liquid;

[0040] 1. Balloon; 11. Balloon body; 12. Distal leg; 13. Proximal leg;

[0041] 2. Inner tube; 21. Groove;

[0042] 3. Outer tube;

[0043] 4. Liquid guide member; 41. First part; 42. Second part; 43. Gas storage channel; 44. Liquid guide cavity;

[0044] 5. Support assembly; 51. First support member; 52. Second support member;

[0045] 6. Radiopaque ring;

[0046] 7. Catheter hub. DETAILED DESCRIPTION

[0047] In the following, only certain exemplary embodiments are simply described. As those skilled in the art will realize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present application. The drawings and description are therefore to be considered exemplary in nature and not restrictive.

[0048] In the description of the embodiments of the present application, it needs to be understood that the terms "far", "near" and the like indicate the position or positional relationship defined by the position of the balloon dilatation catheter when in use, wherein the side close to the operator is the proximal end and the side away from the operator is the distal end. It is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular position, be constructed and operated in a particular position, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0049] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0050] In the embodiments of the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The "under", "below" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0051] The following disclosure provides many different embodiments or examples for implementing different structures of the embodiments of the present application. In order to simplify the disclosure of the embodiments of the present application, the components and arrangements of specific examples are described below. Of course, they are only examples and the purpose is not to limit the embodiments of the present application. In addition, the embodiments of the present application can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or arrangements discussed.

[0052] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0053] Embodiment 1

[0054] A balloon dilatation catheter, as shown in Figures 1 to 10 It includes a balloon 1, an inner tube 2, an outer tube 3, a liquid guide member 4 and a support assembly 5.

[0055] The balloon 1 has an inflated state and a deflated state, and specifically comprises a balloon body 11, and a distal tube foot 12 and a proximal tube foot 13 arranged at the distal end and the proximal end of the balloon body 11 respectively. In the embodiment, the length of the proximal tube foot 13 along the axial direction is greater than the length of the distal tube foot 12 along the axial direction, so as to provide a sufficient air storage channel 43 to accommodate the air not discharged from the balloon 1, which will be discussed in detail below.

[0056] The distal end of the inner tube 2 penetrates through the balloon body 11 and is connected with the distal tube foot 12. The distal tube foot 12 and the inner tube 2 can be fixed together by a welding process, and the connection mode can also be other modes in the prior art, which is not limited in the present application. A plurality of grooves 21 extending along the axial direction are formed on the outer wall of the portion of the inner tube 2 located in the balloon body 11. Preferably, the plurality of grooves 21 are uniformly arranged around the axial line of the inner tube 2. The inner tube 2 is preferably filled with barium sulfate (BaSO4) to have a developing function under X-ray.

[0057] The outer tube 3 is sleeved outside the inner tube 2 and has a distal end connected with the proximal tube foot 13. The connection mode is referred to the inner tube 2. The outer tube 3 and the inner tube 2 form a filling cavity, which is in communication with the balloon 1 and is used to transmit a filling liquid (such as a developing liquid) to drive the state conversion of the balloon 1. For example, when the filling liquid is introduced into the balloon 1 through the filling cavity, the balloon 1 can be switched to the inflated state; when the filling liquid is discharged through the filling cavity, the balloon 1 can be switched to the deflated state.

[0058] The liquid guide member 4 is sleeved outside the inner tube 2 and comprises a first portion 41 and a second portion 42 located at the distal end of the first portion 41, and the material is preferably nylon. The distal end of the second portion 42 extends into the distal end of the balloon 1 and forms a liquid guide cavity 44 with the inner tube 2. The liquid guide cavity 44 is in communication with the filling cavity. When the filling liquid is introduced into the filling cavity, the filling liquid is guided by the liquid guide cavity 44, enters the balloon 1 from the distal end of the balloon 1 and flows to the proximal end, so as to avoid the filling liquid from entering from the proximal end to squeeze and gather the air not discharged from the balloon 1 at the distal end of the balloon 1, thereby affecting the development of the balloon 1. Further, the second portion 42 has a folded state of being wound on the inner tube 2 and an expanded state of expanding outward. When the second portion 42 is in the folded state, it is folded into multiple petals, preferably three petals, so as to facilitate the folding and winding of the balloon 1 and improve the winding property of the balloon 1. When the filling liquid is introduced thereinto, the second portion 42 expands outward, so as to allow the filling liquid to pass through the portion and be discharged.

[0059] The proximal end of the first part 41 is connected to the outer tube 3 and / or the proximal tube leg 13, and in this embodiment, the proximal end of the first part 41 is connected to the inner side wall of the outer tube 3, and the connection mode is referred to the inner tube 2, and the remaining part is arranged with the gas storage channel 43 between the first part 41 and the proximal tube leg 13. With the gradual filling of the filling liquid, the filling liquid will extrude the air that has not been exhausted to the proximal end of the balloon 1, and due to the arrangement of the gas storage channel 43, the air can be collected in the gas storage channel 43 and cannot move, which will not affect the development of the proximal end of the balloon 1.

[0060] The support assembly 5 includes a first support member 51 and a second support member 52.

[0061] The first support member 51 is arranged between the liquid guide member 4 and the inner tube 2 and allows the filling liquid to pass through, and the first support member 51 is specifically a mesh support. When the balloon 1 is backfilled with the filling liquid, the liquid guide member 4 will be shrunk due to the negative pressure and thus be adsorbed on the inner tube 2, which will affect the filling liquid to pass out. The mesh support is arranged between the inner tube 2 and the liquid guide member 4, so that there is a space between the liquid guide member 4 and the inner wall of the groove 21 of the inner tube 2, which is beneficial to the smooth passage of the filling liquid. In this embodiment, the distal end of the first support member 51 protrudes from the liquid guide member 4, and the material of the first support member 51 is stainless steel, for example, 304 stainless steel.

[0062] The second support member 52 is a mesh support, which is arranged outside the first part 41 and separates the proximal tube leg 13 from the liquid guide member 4 to form the gas storage channel 43. The main function of the second support member 52 is to provide support force for the liquid guide member 4 when it is under pressure, so as to provide support for the gas storage channel 43 in the balloon 1. If the second support member 52 is not installed, the first part 41 of the liquid guide member 4 will be deformed when the filling liquid is filled, which will extrude the gas storage channel 43, so that the air that has not been exhausted in the balloon 1 cannot enter the gas storage space smoothly, which will affect the development. Further, the distal end of the second support member 52 and the proximal end of the first support member 51 have an overlapping area on the horizontal plane, and the material of the second support member 52 is stainless steel, for example, 304 stainless steel.

[0063] The balloon dilation catheter further includes a development ring 6, and the development ring 6 has two parts arranged at the distal end and the proximal end of the balloon main body 11, and the development ring 6 is preferably a tungsten ring.

[0064] The balloon dilation catheter further includes a catheter seat 7, and the structure of the catheter seat 7 can be referred to the prior art, and the present application is not specifically limited.

[0065] Working principle:

[0066] The contrast medium is injected into the inflation cavity between the inner tube 2 and the outer tube 3 through the catheter seat 7, and the contrast medium is guided by the guide cavity and enters the balloon 1 from the distal end of the balloon 1 and flows to the proximal end. As the contrast medium is injected, the air not completely discharged in the balloon 1 is pushed to the proximal end of the balloon 1, and the first part 41 of the guide member 4 is not pressed to deform outward to squeeze the air storage cavity between the proximal tube foot 13 and the catheter member due to the support of the second support member 52, and the air can smoothly enter the air storage cavity, and the balloon 1 is fully expanded.

[0067] The contrast medium in the balloon 1 is extracted through the catheter seat 7, the second part 42 of the guide member 4 is deflated under negative pressure, and due to the blockage of the first support member 51, a space is left between the second part 42 and the inner wall of the groove 21 of the inner tube 2, allowing the inflation liquid to pass out, and after the inflation liquid is completely passed out, the balloon 1 is switched to the contracted state.

[0068] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made in accordance with the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A balloon dilatation catheter characterized by, include: A balloon (1), wherein the balloon (1) has an expanded state and a contracted state, and comprises a balloon body (11) and a distal pin (12) and a proximal pin (13) respectively arranged at the distal and proximal ends of the balloon body (11); an inner tube (2), the distal end of the inner tube (2) passing through the balloon body (11) and connected to the distal end pin (12), and a plurality of grooves (21) extending in the axial direction are formed on the outer wall of the portion of the inner tube (2) located inside the balloon body (11); An outer tube (3), the outer tube (3) being sleeved on the outer side of the inner tube (2) and having its distal end connected to the proximal tube pin (13), a filling cavity being formed between the outer tube (3) and the inner tube (2), the filling cavity being used to transmit a filling fluid to drive the state conversion of the balloon (1); a liquid-guiding member (4), the liquid-guiding member (4) being sleeved on the outer side of the inner tube (2), the proximal end of the liquid-guiding member (4) being connected to the outer tube (3) and / or the proximal tube pin (13), and an air storage channel (43) being formed between the liquid-guiding member (4) and the proximal tube pin (13), the distal end of the liquid-guiding member (4) extending into the distal end of the balloon body (11) and forming a liquid-guiding cavity (44) between the liquid-guiding member (4) and the inner tube (2), the liquid-guiding cavity (44) being in communication with the filling cavity; A support assembly (5) includes a first support member (51) disposed between the liquid-guiding member (4) and the inner tube (2) and allowing the filling liquid to pass through.

2. The balloon dilation catheter of claim 1, wherein, The first supporting member (51) is a mesh-shaped bracket; and / or, The distal end of the first supporting member (51) is flush with the liquid-guiding member (4) or extends beyond the liquid-guiding member (4); and / or, The first supporting member (51) is made of stainless steel.

3. The balloon dilation catheter of claim 1, wherein, The support assembly (5) further comprises a second support member (52) provided at the proximal end portion of the liquid-guiding member (4); the second support member (52) is a mesh-shaped bracket and separates the proximal pin (13) from the liquid-guiding member (4) to form the gas storage channel (43).

4. The balloon dilatation catheter according to claim 3, characterized in that: The distal end of the second support member (52) and the proximal end of the first support member (51) have an overlapping area in a horizontal plane, or the distal end of the second support member (52) is flush with the proximal end of the first support member (51), and / or; The second supporting member (52) is made of stainless steel.

5. The balloon dilation catheter of claim 1, wherein, The portion of the liquid-guiding member (4) located inside the balloon body (11) has a folded state wound around the inner tube (2) and an expanded state expanded outward.

6. The balloon dilation catheter of claim 5, wherein, When the portion of the liquid-guiding member (4) located inside the balloon body (11) is in a folded state, it is folded into multiple petals.

7. The balloon dilatation catheter of any of claims 1, 5, 6, wherein, The material of the liquid-conducting component (4) is nylon.

8. The balloon dilation catheter of claim 1, wherein, The plurality of grooves (21) are arranged around the axis of the inner tube (2).

9. The balloon dilation catheter of claim 1, wherein, The length of the proximal tube pin (13) along the axial direction is greater than the length of the distal tube pin (12) along the axial direction.

10. The balloon dilation catheter of claim 1, wherein, The balloon expansion catheter further comprises a visualization ring (6) sleeved outside the first support member (51), and the visualization ring (6) has two parts arranged at the two ends of the balloon body (11) respectively.

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