Balloon micro catheter
By designing the venting structure of the balloon microcatheter and utilizing the differences in liquid pressure and gas flow characteristics, the problem of residual air bubbles was solved, achieving uniform balloon expansion and improved imaging effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NEUROSAFE MEDICAL CO LTD
- Filing Date
- 2025-01-16
- Publication Date
- 2026-05-19
AI Technical Summary
During use, residual air bubbles inside existing balloon microcatheters can affect imaging results, potentially causing uneven balloon expansion or rupture, and making it difficult to effectively remove the air bubbles.
A balloon microcatheter was designed that, through the action of liquid pressure and the difference in flow characteristics between gas and liquid in the vent, gas is expelled first, the liquid flows smoothly, and the airway fixing component is pressed tight under the pressure reaction, gradually closing the vent and reducing the amount of residual air bubbles.
It effectively reduces residual air bubbles, ensures uniform balloon expansion, avoids rupture, and improves the reliability of surgical procedures and imaging results.
Smart Images
Figure CN224251917U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of catheter technology, and in particular relates to a balloon microcatheter. Background Technology
[0002] Transcatheter arterial chemoembolization (TACE) involves selectively or superselectively inserting a catheter into the target artery supplying the tumor, then injecting an appropriate amount of embolic agent at a suitable rate to occlude the target artery, causing ischemic necrosis of the tumor tissue. Using anticancer drugs or drugs combined with microparticles or microspheres can achieve the effect of chemoembolization. A balloon microcatheter has a compliant balloon attached to its distal end. Its working principle is to deliver the balloon to the target blood vessel or lesion site, and then inject an expansion medium such as contrast agent or saline into the balloon through a syringe, causing the balloon to inflate and adhere to the blood vessel wall, thereby achieving the effect of occlusion or dilation.
[0003] If air bubbles remain inside the existing balloon microcatheter during use, it will not only affect the imaging effect, but may also interfere with the surgical procedure, and may even cause uneven balloon inflation or rupture. The air inside the balloon may not be able to be effectively expelled, resulting in the problem of air residue. Utility Model Content
[0004] To address the problems existing in the prior art, this utility model provides a balloon microcatheter. Due to the pressure of the liquid and the difference in flow characteristics between gas and liquid in the vent, the gas will be expelled first. Once the gas is expelled, the flow of liquid will become smoother because there are no longer gas molecules in the channel that hinder the flow of liquid. As the liquid gradually fills the balloon, the pressure inside the balloon will increase as the balloon gradually enlarges. The airway fixation component will be pressed against the inner tube assembly due to the reaction force of the pressure. This pressing action will cause the channel originally used for the vent to gradually narrow and eventually close.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a balloon microcatheter, comprising a catheter seat, a main tube and a secondary tube disposed on the catheter seat, an inner tube assembly fixedly connected to one end of the main tube, the interior of the main tube communicating with the interior of the inner tube, an outer tube fixedly connected to one end of the secondary tube, the interior of the outer tube fixedly connected to the surface of the inner tube, and a through hole provided between the outer tube and the inner tube, an airway fixation member fixedly connected to the surface of the inner tube, a balloon fixedly connected to the surfaces of both the outer tube and the airway fixation member, and an exhaust hole provided inside the airway fixation member.
[0006] Furthermore, the interior of the vent is connected to the interior of the balloon.
[0007] Furthermore, the interior of the through hole is connected to the interior of the balloon.
[0008] Compared with the prior art, the beneficial effects of this utility model are:
[0009] 1. Due to the pressure of the liquid and the difference in flow characteristics between gas and liquid in the vent, the gas will be expelled first. Once the gas is expelled, the flow of liquid will become smoother because there are no longer gas molecules in the channel that would hinder the flow of liquid. As the liquid gradually fills the balloon, the pressure inside the balloon will increase as the balloon gradually enlarges. The airway fixing component will be pressed against the inner tube assembly due to the reaction force of the pressure. This pressing action will cause the channel originally used for the vent to gradually narrow and eventually close.
[0010] 2. While maintaining a certain area, the through-hole allows the solution to form a small amount of pressure in the welding area. The through-hole design helps to reduce the bubbles formed by slow and intermittent injection. When the solution passes through the through-hole, the bubbles are more easily squeezed out or dissolved in the solution due to the pressure, thereby reducing the residual bubbles in the balloon. Attached Figure Description
[0011] Figure 1 This is a cross-sectional view of the overall device structure of this utility model.
[0012] Figure 2 This is a schematic diagram of the balloon structure of this utility model.
[0013] Figure 3 This is a schematic diagram of the airway fixing component of this utility model.
[0014] Figure 4 This is a cross-sectional view of the outer tube structure of this utility model.
[0015] Figure 5 This is a cross-sectional view of the airway fixing component of this utility model.
[0016] Figure 6 This is a schematic diagram of the uninflated balloon structure of this utility model.
[0017] Figure 7 This is a schematic diagram of the balloon inflation structure of this utility model.
[0018] In the diagram: 1. Catheter seat; 2. Vent port; 3. Outer tube; 4. Balloon; 5. Inner tube; 6. Airway fixation device. Detailed Implementation
[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0020] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Example
[0021] See appendix Figure 1-7 As shown, a balloon microcatheter includes a catheter seat 1, on which a main tube and a secondary tube are provided. One end of the main tube is fixedly connected to an inner tube 5 assembly, and the interior of the main tube is connected to the interior of the inner tube 5. One end of the secondary tube is fixedly connected to an outer tube 3, and the interior of the outer tube 3 is fixedly connected to the surface of the inner tube 5. A through hole is provided between the outer tube 3 and the inner tube 5. An airway fixation member 6 is fixedly connected to the surface of the inner tube 5. A balloon 4 is fixedly connected to the surfaces of both the outer tube 3 and the airway fixation member 6. An exhaust hole 2 is provided inside the airway fixation member 6.
[0022] The interior of the vent 2 is connected to the interior of the balloon 4.
[0023] The interior of the through hole is connected to the interior of the balloon 4.
[0024] Working Principle: During use, the solution is injected into the balloon 4 through the secondary tube. The solution enters the balloon 4 through the through-hole. While maintaining a certain area, the through-hole allows for a small amount of pressure buildup of the solution in the welding area. The through-hole design helps reduce air bubbles formed due to slow and intermittent injection. When the solution passes through the through-hole, due to the pressure effect, air bubbles are more easily squeezed out or dissolved in the solution, thus reducing the amount of air bubbles remaining in the balloon 4. The airway fixing component 6 is located inside the balloon 4 adjacent to the inner tube 5. This airway fixing component 6 is not fixed inside the balloon 4 to ensure that venting is not obstructed before the liquid reaches the balloon 4. When the liquid begins to be injected, the airway fixing component 6 will encounter some resistance, causing the liquid flow to slow down. Because gas molecules are small and highly mobile, they can pass smoothly through the vent hole 2. In contrast, liquid molecules are larger and less mobile, so they are not easy to pass through the vent hole 2. When the liquid is injected, due to the pressure of the liquid and the difference in flow characteristics between gas and liquid in the vent hole 2, the gas will be expelled first. Once the gas is expelled, the flow of liquid will slow down. The flow becomes smoother because there are no longer gas molecules obstructing the flow of liquid in the channel. As the liquid gradually fills the balloon 4, the pressure inside the balloon 4 gradually increases with the increase of liquid. This is because liquid is incompressible. Therefore, when more liquid is injected into the balloon 4, the balloon 4 must expand to accommodate the additional liquid. This expansion causes the balloon 4 wall to expand outward, thereby increasing the pressure inside the balloon 4. As the balloon 4 gradually increases in size, the pressure inside the balloon 4 will also increase. This increase in pressure will generate a reaction force on the airway fixation member 6. When the pressure inside the balloon 4 increases to a certain level, this reaction force will become strong enough to generate a compression effect on the airway fixation member 6, especially in the unfixed parts of the airway fixation member 6. The airway fixation member 6 will be pressed against the inner tube 5 assembly due to the reaction force of the pressure. This pressing action will cause the channel originally used for the exhaust port 2 to gradually narrow and eventually close. At the same time, a portion of the outer tube 3 and the inner tube 5 are fixedly connected together, ensuring that the distal ends of the inner tube 5 and the outer tube 3 can rotate synchronously without causing kinking.
[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model, and no reference numerals in the claims should be construed as limiting the scope of the claims.
[0026] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A balloon microcatheter comprising a catheter hub (1) provided with a main tube and a sub tube, characterized in that: One end of the main pipe is fixedly connected with an inner pipe (5) assembly, the inside of the main pipe is communicated with the inside of the inner pipe (5), one end of the auxiliary pipe is fixedly connected with an outer pipe (3), the inside of the outer pipe (3) is fixedly connected with the surface of the inner pipe (5), and a through hole is arranged between the outer pipe (3) and the inner pipe (5), the surface of the inner pipe (5) is fixedly connected with an airway fixing piece (6), the surface of the outer pipe (3) and the airway fixing piece (6) are fixedly connected with a balloon (4), and the inside of the airway fixing piece (6) is provided with an exhaust hole (2).
2. The balloon microcatheter of claim 1, wherein: The inside of the exhaust hole (2) is communicated with the inside of the balloon (4).
3. The balloon microcatheter of claim 1, wherein: The inside of the through hole is communicated with the inside of the balloon (4).