Balloon dilatation catheter

Abstract

The balloon dilatation catheter comprises a balloon, an inner tube, an outer tube, a liquid guide component and a supporting assembly, the inner tube is sleeved with the liquid guide component, the near end of the liquid guide component is connected to the outer tube and / or a near-end tube pin of the balloon, an air storage channel is formed between the near end of the liquid guide component and the near-end tube pin, and the far end of the liquid guide component extends into the far end of the balloon and forms a liquid guide cavity between the far end of the liquid guide component and the inner tube; the supporting assembly comprises a first supporting component which is arranged between the liquid guiding component and the inner pipe and allows the filling liquid to pass through. By arranging the liquid guide component, the filling liquid flows into the balloon from the far end of the balloon, the situation that far-end development is affected due to the fact that air gathers at the far end of the balloon is avoided, meanwhile, the air storage channel is arranged at the near end of the balloon, air driving the near end of the balloon is gathered in the air storage channel, and near-end development is not affected; in addition, through the design of the groove of the inner tube and the supporting assembly, the filling liquid in the balloon can be smoothly pumped back, back holding of the balloon is facilitated, and the balloon is conveniently taken out.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a balloon dilatation catheter. Background Art

[0002] Existing balloon dilatation catheters usually include a balloon, a catheter, and a catheter seat. Before use, the gas in the balloon needs to be evacuated, and then a filling liquid (such as a developer) is introduced into the balloon to expand the balloon. However, due to the large size of the balloon itself or other problems such as operation, the air in the balloon cannot be completely exhausted before filling, and a small amount of air will accumulate at the far end, resulting in the inner tube at the far end of the balloon being unable to be completely immersed in the developer, and thus unable to be developed under X-rays, which can easily cause medical staff to make misjudgments during use, especially for products such as large-diameter and extra-long balloons, where it is more difficult to evacuate the air.

[0003] Patent CN 113018652 A discloses a liquid-conducting balloon dilatation catheter, which can change the existing structure of expelling air in vitro to in vivo by setting an injection port and an exhaust port in the balloon body. However, the air in the balloon cannot be emptied, and it will inevitably cause air to accumulate at the proximal end of the balloon, which will still affect the imaging. Moreover, since the catheter is mostly flexible, the negative pressure in the catheter will cause it to shrink when the liquid is withdrawn, and the balloon cannot be retracted and withdrawn. Summary of the invention

[0004] The purpose of the present invention is to provide a novel balloon dilatation catheter, which has a better development effect and the balloon has good retraction performance.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A balloon dilatation catheter, comprising:

[0007] A balloon, wherein the balloon has an expanded state and a contracted state, and comprises a balloon body and a distal pin and a proximal pin respectively arranged at the distal and proximal ends of the balloon body;

[0008] An inner tube, the distal end of which passes through the balloon body and is connected to the distal end pin, and a plurality of grooves extending in the axial direction are formed on the outer wall of the portion of the inner tube located inside the balloon body;

[0009] An outer tube, wherein the outer tube is sleeved on the outer side of the inner tube and the distal end of the outer tube is connected to the proximal tube pin, and a filling cavity is formed between the outer tube and the inner tube, and the filling cavity is used to transmit a filling fluid to drive the state conversion of the balloon;

[0010] a liquid-conducting member, wherein the liquid-conducting member is sleeved on the outer side of the inner tube, the proximal end of the liquid-conducting member is connected to the outer tube and / or the proximal tube pin and an air storage channel is formed between the liquid-conducting member and the proximal tube pin, the distal end of the liquid-conducting member extends into the distal end of the balloon body and forms a liquid-conducting cavity with the inner tube, and the liquid-conducting cavity is in communication with the filling cavity;

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

[0012] The present invention provides a liquid-guiding component so that the filling liquid flows out from the distal end of the balloon and toward the proximal end after being guided by the liquid-guiding component, thereby preventing air from gathering at the distal end of the balloon and affecting the development of the distal end. At the same time, an air storage channel is configured at the proximal end of the balloon to gather the air driven out of the proximal end of the balloon in the air storage channel without affecting the development of the proximal end. The present invention also prevents the liquid-guiding tube from being compressed and adsorbed on the inner tube during withdrawal and affecting the withdrawal of the filling liquid, thereby enabling the filling liquid in the balloon to be withdrawn smoothly, thereby facilitating the contraction of the balloon and facilitating the removal of the balloon.

[0013] Preferably, the first supporting member is a mesh support. When the filling liquid in the balloon is withdrawn, the liquid-guiding member will shrink due to the negative pressure, and thus be adsorbed on the inner tube, affecting the outflow of the filling liquid. The mesh support is blocked between the inner tube and the liquid-guiding member, so that there is space between the liquid-guiding member and the groove of the inner tube, which facilitates the outflow of the filling liquid.

[0014] Preferably, the distal end of the first supporting member is flush with the liquid-guiding member or protrudes from the liquid-guiding member.

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

[0016] Preferably, the support assembly further comprises a second support member disposed at the proximal end of the liquid-conducting member, the second support member being a mesh support and separating the proximal pin from the liquid-conducting member to form the air storage channel. The second support member provides support for the gathering space of the air bubbles at the proximal end of the balloon on the one hand, and provides support force for the installation (such as welding) of the liquid-conducting member and the outer tube and / or the proximal pin on the other hand.

[0017] Preferably, the distal end of the second supporting member and the proximal end of the first supporting member have an overlapping area in a horizontal plane, or the distal end of the second supporting member is flush with the proximal end of the first supporting member.

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

[0019] Preferably, the portion of the liquid-conducting member located inside the balloon body has a folded state wound around the inner tube and an expanded state expanded outward.

[0020] Further preferably, when the portion of the liquid-conducting member located within the balloon body is in a folded state, it is folded into multiple petals.

[0021] In some embodiments, the liquid-conducting member is folded into three petals, and the folding and rolling of the liquid-conducting member facilitates the folding and rolling of the balloon.

[0022] Preferably, the liquid-conducting member is made of nylon.

[0023] Preferably, the plurality of grooves are arranged around the axial center line of the inner tube.

[0024] Preferably, the length of the proximal pin along the axial direction is greater than the length of the distal pin along the axial direction.

[0025] Preferably, the balloon dilatation catheter further comprises a developing ring sleeved on the outside of the inner tube, and the developing ring comprises two developing rings respectively arranged at the far and near ends of the balloon body.

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

[0027] The present invention provides a liquid guiding member so that the filling liquid flows out from the far end of the balloon and flows to the near end after being guided by the liquid guiding member, thereby preventing air from gathering at the far end of the balloon and affecting the far end imaging. At the same time, an air storage channel is arranged at the near end of the balloon so that the air driven out of the near end of the balloon is gathered in the air storage channel, which does not affect the near end imaging and provides a better user experience.

[0028] The present invention also enables the filling fluid in the balloon to be smoothly withdrawn through the design of the groove of the inner tube and the supporting assembly, which is beneficial to the retraction of the balloon and convenient for taking out the balloon. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 It is a schematic structural diagram of the balloon dilatation catheter of Example 1;

[0031] Figure 2 It is a schematic structural diagram of the distal end portion of the balloon dilatation catheter of Example 1;

[0032] Figure 3This is a schematic structural diagram of the distal end of the balloon dilatation catheter of Example 1 being filled with a filling liquid;

[0033] Figure 4 for Figure 3 A magnified schematic diagram of part A;

[0034] Figure 5 for Figure 3 A magnified schematic diagram of part B;

[0035] Figure 6 It is a half-section schematic diagram of the distal end portion of the balloon dilatation catheter of Example 1;

[0036] Figure 7 It is a schematic structural diagram of the inner tube (only the distal end portion is shown), the first supporting member and the developing ring of Example 1;

[0037] Figure 8 for Figure 7 A cross-sectional schematic diagram of

[0038] Fig. 9 It is a schematic structural diagram of the outer tube (partial cross-section), the second supporting member and the liquid guiding member of Example 1;

[0039] Fig.10 for Figure 7 and Figure 8 A schematic diagram of the structure after the structure shown is assembled;

[0040] Wherein: 1. balloon; 11. balloon body; 12. distal pin; 13. proximal pin;

[0041] 2. inner tube; 21. groove;

[0042] 3. External management;

[0043] 4. Liquid-conducting member; 41. first part; 42. second part; 43. gas storage channel; 44. liquid-conducting cavity 44;

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

[0045] 6. Development ring;

[0046] 7. Catheter seat. DETAILED DESCRIPTION

[0047] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0048] In the description of the embodiments of the present invention, it should be understood that the terms "distal", "proximal", etc. indicate positions or positional relationships 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. This is only for the convenience of describing the embodiments of the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the embodiments of the present invention.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0050] In the embodiments of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0051] The disclosure below provides many different embodiments or examples to implement different structures of the embodiments of the present invention. In order to simplify the disclosure of the embodiments of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present invention. In addition, the embodiments of the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0052] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0053] Example 1

[0054] A balloon dilatation catheter, such as Figures 1 to 10 As shown, it includes a balloon 1, an inner tube 2, an outer tube 3, a liquid-conducting component 4 and a supporting component 5.

[0055] The balloon 1 has an expanded state and a contracted state, and specifically includes 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. In this embodiment, the axial length of the proximal pin 13 is greater than the axial length of the distal pin 12 to provide a sufficient air storage channel 43 to accommodate the unexhausted air in the balloon 1, which will be discussed in detail below.

[0056] The distal end of the inner tube 2 passes through the balloon body 11 and is connected to the distal pin 12. The distal pin 12 and the inner tube 2 can usually be fixed together by welding. Of course, the connection method can also be other methods in the prior art, which is not specifically limited by the present invention. The outer wall of the inner tube 2 located inside the balloon body 11 is provided with a plurality of grooves 21 extending in the axial direction. Preferably, the plurality of grooves 21 are evenly arranged around the axis of the inner tube 2. The inner tube 2 is preferably made of nylon filled with barium sulfate (BaSO 4 ) to enable it to develop under X-rays.

[0057] The outer tube 3 is sleeved on the outer side of the inner tube 2 and its distal end is connected to the proximal pin 13, and the connection method is similar to that of the inner tube 2. A filling cavity is formed between the outer tube 3 and the inner tube 2, and the filling cavity is connected to the balloon 1 for transmitting a filling liquid (such as a developer) to drive the state conversion of the balloon 1. For example, when a filling liquid is introduced into the balloon 1 through the filling cavity, the balloon 1 can be switched to an expanded state; when a filling liquid is discharged from the filling cavity, the balloon 1 can be switched to a contracted state.

[0058] The liquid-conducting member 4 is sleeved on the outer side of the inner tube 2, and includes a first part 41 and a second part 42 located at the distal end of the first part 41, and the material is preferably nylon. Among them, the distal end of the second part 42 extends into the distal end of the balloon 1 and forms a liquid-conducting cavity 44 between the inner tube 2, and the liquid-conducting cavity 44 is connected with the filling cavity. When the filling liquid is introduced into the filling cavity, the filling liquid is guided by the liquid-conducting cavity 44, enters the balloon 1 from the distal end of the balloon 1 and flows to the proximal end, thereby avoiding the filling liquid from entering from the proximal end and squeezing the air that has not been exhausted in the balloon 1 to gather at the distal end of the balloon 1, affecting the development of the balloon 1. Furthermore, the second part 42 has a folded state wound on the inner tube 2 and an expanded state expanding outward. When the second part 42 is in the folded state, it is folded into multiple petals, preferably folded into three petals, so as to facilitate the folding and winding of the balloon 1 and improve the re-embraceability of the balloon 1. When filling fluid is introduced therein, the second portion 42 expands outwardly, thereby allowing the filling fluid to pass out through the portion.

[0059] The proximal end of the first part 41 is connected to the outer tube 3 and / or the proximal pin 13. In this embodiment, the proximal end of the first part 41 is connected to the inner wall of the outer tube 3, and the connection method is similar to that of the inner tube 2. An air storage channel 43 is arranged between the remaining part and the proximal pin 13. As the filling liquid is gradually introduced, the filling liquid squeezes the unexhausted air toward the proximal end of the balloon 1. Due to the setting of the air storage channel 43, the air can be gathered in the air storage channel 43 and will not move, and 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 disposed between the liquid-guiding member 4 and the inner tube 2 and allows the filling liquid to pass through. The first support member 51 is specifically a mesh support. When the filling liquid in the balloon 1 is withdrawn, the liquid-guiding member 4 will shrink due to the negative pressure, and thus be adsorbed on the inner tube 2, affecting the outflow of the filling liquid. The mesh support is blocked between the inner tube 2 and the liquid-guiding member 4, so that there is space between the liquid-guiding member 4 and the inner wall of the groove 21 of the inner tube 2, which is conducive to the smooth outflow of the filling liquid. In this embodiment, the distal end of the first support member 51 extends out of the liquid-guiding member 4, and the material of the first support member 51 is stainless steel, such as 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 pin 13 from the liquid-conducting member 4 to form an air storage channel 43. The main function of the second support member 52 is to provide support for the liquid-conducting member 4 when it is under pressure, thereby providing support for the air storage channel 43 in the balloon 1. If the second support member 52 is not installed and the invisible liquid is filled, the first part 41 of the liquid-conducting member 4 will be deformed and squeeze the air storage channel 43, which will cause the air in the balloon 1 to not be exhausted and cannot smoothly enter the air storage space, thereby affecting the development. Furthermore, 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, such as 304 stainless steel.

[0063] The balloon dilatation catheter further includes a developing ring 6 , which has two developing rings 6 disposed at the far and near ends of the balloon body 11 , and the developing rings 6 are preferably tungsten rings.

[0064] The balloon dilatation catheter further comprises a catheter seat 7. The structure of the catheter seat 7 may refer to the prior art, and the present invention does not impose any specific limitation thereto.

[0065] Working principle:

[0066] The developer is introduced into the filling cavity between the inner tube 2 and the outer tube 3 through the catheter seat 7. The developer enters the balloon 1 from the distal end of the balloon 1 and flows to the proximal end through the diversion cavity. With the introduction of the developer, the air that has not been exhausted in the balloon 1 is driven to the proximal end of the balloon 1. Due to the supporting effect of the second supporting member 52, the first part 41 of the liquid guiding member 4 will not be compressed to deform into an outer shape and squeeze the air storage cavity between the proximal tube pin 13 and the catheter member. The air can smoothly enter the air storage cavity, and the balloon 1 completes expansion.

[0067] The developing liquid in the balloon 1 is withdrawn through the catheter seat 7, and the second part 42 of the liquid-conducting member 4 shrinks under negative pressure. Due to the obstruction of the first supporting member 51, space is left between the second part 42 and the inner wall of the groove 21 of the inner tube 2, allowing the filling liquid to pass out. After all the filling liquid has passed out, the balloon 1 switches to the contracted state.

[0068] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A balloon dilatation catheter, characterized in that: 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 tube pin (12) and a proximal tube 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-conducting member (4), the liquid-conducting member (4) being sleeved on the outer side of the inner tube (2), the proximal end of the liquid-conducting member (4) being connected to the outer tube (3) and / or the proximal tube pin (13) and forming an air storage channel (43) between the liquid-conducting member (4) and the proximal tube pin (13), the distal end of the liquid-conducting member (4) extending into the distal end of the balloon body (11) and forming a liquid-conducting cavity (44) with the inner tube (2), the liquid-conducting cavity (44) being in communication with the filling cavity; A support assembly (5), the support assembly (5) comprising a first support member (51) disposed between the liquid-conducting member (4) and the inner tube (2) and allowing the filling liquid to pass through.

2. The balloon dilatation catheter according to claim 1, characterized in that: 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-conducting member (4) or extends out from the liquid-conducting member (4); and / or, The first supporting member (51) is made of stainless steel.

3. The balloon dilatation catheter according to claim 1, characterized in that: The support assembly (5) further comprises a second support member (52) arranged at the proximal end of the liquid-conducting member (4); the second support member (52) is a mesh-shaped bracket and separates the proximal pin (13) from the liquid-conducting 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 dilatation catheter according to claim 1, characterized in that: The portion of the liquid-conducting 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 dilatation catheter according to claim 5, characterized in that: When the portion of the liquid-conducting member (4) located inside the balloon body (11) is in a folded state, it is folded into multiple petals.

7. The balloon dilatation catheter according to any one of claims 1, 5 and 6, characterized in that: The material of the liquid-conducting component (4) is nylon.

8. The balloon dilatation catheter according to claim 1, characterized in that: The plurality of grooves (21) are arranged around the axis of the inner tube (2).

9. The balloon dilatation catheter according to claim 1, characterized in that: 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 dilatation catheter according to claim 1, characterized in that: The balloon dilatation catheter further comprises a developing ring (6) sleeved on the outside of the first supporting member (51), and the developing ring (6) comprises two developing rings (6) respectively arranged at the far and near ends of the balloon body (11).

Images