Balloon catheter
By designing a through-flow channel and inner and outer restrictive layers in the balloon catheter, the problems of blood flow obstruction and vascular damage during balloon dilation are solved, enabling long-term vascular dilation and safe treatment.
Patent Information
- Application Number
- CN202423066592.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2034-12-12
AI Technical Summary
Existing balloons can easily block blood flow when treating vascular stenosis, leading to ischemia in distal vessels or tissues, and may damage the vessel wall in areas of severe calcification or fibrosis.
Design a balloon catheter comprising a catheter and a balloon, with a through-flow channel formed between the balloon and the catheter, and the balloon expansion restricted by inner and outer confinement layers to ensure blood flow while preventing the dog bone effect.
This allows for prolonged intravascular dilation therapy while avoiding distal tissue ischemia and vascular wall damage, thus improving treatment efficacy.
Smart Images
Figure CN223901076U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to medical instrument technical field, concretely relates to a balloon catheter. BACKGROUND
[0002] Vascular intervention treatment is an important treatment mode for blood vessel stenosis lesion revascularization treatment, and the balloon is increasingly widely applied in the intervention treatment, which is placed into the human body lumen stenosis, can make the lumen expand within a certain time, thereby facilitating the treatment.
[0003] The existing balloon has the following problems when treating blood vessel stenosis: first, the balloon will block the blood flow after expansion, so it can only be used for a short time, otherwise it may cause ischemia of the distal blood vessels or tissues, resulting in serious consequences. Second, in the case of severe calcification or fibrosis of the blood vessel stenosis, dog bone effect may occur, thereby causing the risk of blood vessel wall damage. UTILITY MODEL CONTENT
[0004] The utility model aims at providing a novel balloon catheter.
[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of:
[0006] A balloon catheter comprises:
[0007] A catheter;
[0008] A balloon, which is sleeved on the outer periphery of the catheter and can be inflated or contracted, and a flow channel is formed between the balloon and the catheter in the inflated state;
[0009] A limiting layer, which comprises an outer limiting layer covering the outer side of the balloon, and the compliance of the outer limiting layer is smaller than that of the balloon.
[0010] After the balloon is expanded, a flow channel is formed between the balloon and the catheter, which can supply blood, thereby ensuring the circulation of blood and preventing ischemia or necrosis of the distal tissues, and the balloon can be placed in the blood vessel or the stenosis for a longer time, thus having a better expansion effect. In addition, the limiting layer can limit the diameter of the balloon within a certain range, prevent dog bone effect, and has good treatment effect.
[0011] Preferably, the limiting layer further comprises an inner limiting layer covering the inner side of the balloon, and the compliance of the inner limiting layer is smaller than that of the balloon. The inner limiting layer ensures the flow channel to be through, so that the balloon always allows blood to pass through the flow channel in the expanded state.
[0012] Preferably, the limiting layer is a mesh structure.
[0013] Further preferably, the restriction layer is woven by the organic high molecular woven filaments.
[0014] In some embodiments, the restriction layer has a number of woven nodes per inch (ppi) of 50-100, further preferably 60-90, and more preferably 60-80, such as 60, 65, 70, 75 or 80.
[0015] In some embodiments, the restriction layer is woven by the organic high molecular woven filaments in warp and weft.
[0016] In some embodiments, the organic high molecular woven filaments are made of ultra-high molecular weight polyethylene.
[0017] Preferably, the balloon is in a hollow cylindrical shape in the inflated state.
[0018] Preferably, the balloon catheter further comprises a proximal connecting tube set and a distal connecting tube set, the proximal connecting tube set comprising a plurality of proximal connecting tubes arranged around the circumference of the catheter, the proximal connecting tubes being connected between the proximal end of the balloon and the catheter; the distal connecting tube set comprising a plurality of distal connecting tubes arranged around the circumference of the catheter, the distal connecting tubes being connected between the distal end of the balloon and the catheter.
[0019] Further preferably, the inflation lumen communicates with the balloon at least through one of the proximal connecting tubes of the proximal connecting tube set or one of the distal connecting tubes of the distal connecting tube set.
[0020] In some embodiments, the inflation lumen has a plurality of corresponding to the proximal connecting tubes or the distal connecting tubes, each inflation lumen communicating with the balloon through the corresponding proximal connecting tube and / or distal connecting tube.
[0021] Further, the inflation lumen has 2-6.
[0022] Thanks to the above technical solution, the present application has the following advantages compared with the prior art:
[0023] The balloon catheter of the present application comprises a catheter, a balloon and a restriction layer, wherein the balloon forms a through flow passage between the catheter when expanded, so that the balloon can be in close contact with the blood vessel wall while the blood can flow to the distal end through the flow passage, avoiding ischemia or necrosis of the distal tissue, so that the balloon can be placed in the blood vessel for a longer time, thus having a better expansion effect; the restriction layer can limit the diameter of the balloon within a certain range, effectively preventing the dog bone effect and achieving good treatment effect. BRIEF DESCRIPTION OF DRAWINGS
[0024] Figure 1 A structure schematic view of a balloon catheter provided for Example 1
[0025] Figure 2 is an enlarged schematic view of the A site in Figure 1
[0026] Figure 3 is a cross-sectional view of a balloon catheter distal end portion according to Example 1;
[0027] Figure 4 is a cross-sectional view of a catheter according to Example 1;
[0028] wherein: 1, catheter; 11, guide wire lumen; 12, filling lumen; 2, balloon; 21, flow channel; 31, outer limiting layer; 311, organic polymer braided wire; 32, inner limiting layer; 41, proximal connecting tube; 42, distal connecting tube; 5, handle. DETAILED DESCRIPTION
[0029] The utility model will be further described below in conjunction with the embodiments shown in the drawings.
[0030] In the following, only certain exemplary embodiments are simply described. As those skilled in the art can realize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the utility model. Therefore, the drawings and the description are considered to be exemplary in nature rather than limiting.
[0031] In the description of the present application, it is understood that the distal end refers to the end of the instrument or component away from the operator, the proximal end refers to the end of the instrument or component close to the operator, the axial direction refers to the direction parallel to the center line of the distal end and the proximal end of the instrument or component, and the inner and outer positions are defined relative to the center of the instrument or component, wherein the inner position is close to the center of the instrument or component, and the outer position is away from the center of the instrument or component; the up and down directions refer to the position of the instrument in the actual use or working state. The above-mentioned orientation words are only for the convenience of describing the embodiments of the present utility model and simplifying the description, and are not intended to indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present utility model.
[0032] In the description of the embodiments of the present utility model, it is understood that the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.
[0033] In this embodiment of the invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0034] The following disclosure provides many different implementations or examples for different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.
[0035] Example 1
[0036] A type of balloon catheter, such as Figures 1 to 4 As shown, it includes a catheter 1, a balloon 2, and a restrictive layer.
[0037] The balloon 2 is fitted around the periphery of the catheter 1 and can expand or contract outwards. When inflated, the balloon 2 forms a through-flow channel 21 between itself and the catheter 1 (see...). Figure 1 The flow channel 21 allows blood to pass through, thus preventing distal tissue ischemia or necrosis during balloon 2 expansion. The balloon 2 can remain in the blood vessel for a longer period, resulting in better expansion. Preferably, the balloon 2 is a hollow cylinder in its expanded state. The material of the balloon 2 is in accordance with existing technology, including but not limited to nylon; this application does not impose specific limitations.
[0038] The restriction layer includes an outer restriction layer 31 covering the outside of the balloon 2, the compliance of the outer restriction layer 31 being less than the compliance of the balloon 2, so as to restrict the expansion of the balloon 2 in diameter (generally refers to the outer diameter) and axial direction, keeping the diameter and axial length of the balloon 2 within a set range and not increasing with the increase of pressure, avoiding the dog bone effect and helping to achieve super high pressure, which is more conducive to the expansion of the blood vessel stenosis. In this embodiment, the balloon 2 can achieve a super high pressure of 40 atm. In addition to the outer restriction layer 31, the restriction layer of this embodiment also includes an inner restriction layer 32 covering the inside of the balloon 2, the compliance of the inner restriction layer 32 being less than the compliance of the balloon 2, so as to restrict the expansion of the balloon 2 in the inner diameter, avoiding the excessive expansion of the inside of the balloon 2 to block the flow channel 21 and hinder the blood flow. The inner restriction layer 32 and the outer restriction layer 31 are in a mesh structure, and the mesh structure of the restriction layer has very low compliance, which can effectively restrict the expansion of the balloon 2. The outer restriction layer 31 is taken as an example for detailed discussion below.
[0039] The outer restriction layer 31 is woven by organic polymer woven wires 311, and as a preferred, the number of woven nodes per inch (ppi) is 50-100, and in this embodiment, the number of woven nodes per inch of the outer restriction layer 31 is 70. Too few woven nodes per inch can limit the expansion of the balloon 2, and too many woven nodes per inch can reduce the flexibility, so it is preferred to be within the above range. The material of the organic polymer woven wire 311 is preferably ultra-high molecular weight polyethylene, which is woven into the outer restriction layer 31 by warp and weft. The inner restriction layer 32 is similar to the outer restriction layer 31 and will not be repeated here.
[0040] The balloon catheter also includes a proximal connecting tube group and a distal connecting tube group. The proximal connecting tube group includes a plurality of proximal connecting tubes 41 arranged circumferentially around the catheter 1, the proximal connecting tubes 41 being connected between the proximal end of the balloon 2 and the catheter 1; the distal connecting tube group includes a plurality of distal connecting tubes 42 arranged circumferentially around the catheter 1, the distal connecting tubes 42 being connected between the distal end of the balloon 2 and the catheter 1. The proximal connecting tubes 41 and the distal connecting tubes 42 not only serve as support for the balloon 2, keeping the axial center line of the balloon 2 coinciding or substantially coinciding with the axial center line of the catheter 1 when the balloon 2 expands, but also serve as a channel connecting the balloon 2 and the catheter 1, realizing the expansion or contraction of the balloon 2. In this embodiment, the proximal connecting tubes 41 and the distal connecting tubes 42 are symmetrically arranged and have 4 equal intervals.
[0041] Referring to Figure 3 and Figure 4The catheter 1 has a guide wire lumen 11 for passing a guide wire and a filling lumen 12 for passing a filling medium, the filling lumen 12 being in communication with the balloon 2 at least through one of the proximal connection tubes 41 of the proximal connection tube set or one of the distal connection tubes 42 of the distal connection tube set. In the present embodiment, the filling lumen 12 has a plurality of corresponding proximal connection tubes 41 or distal connection tubes 42, i.e. the filling lumen 12 has four, and the four filling lumens 12 are arranged on the circumference of the guide wire lumen 11, each of the filling lumens 12 being in communication with the balloon 2 through the corresponding proximal connection tube 41 and distal connection tube.
[0042] The balloon catheter further comprises a handle 5 connected to the proximal end of the catheter 1, the structure of which can refer to the prior art.
[0043] The balloon catheter described above limits the diameter and axial length of the balloon 2 through the arrangement of the inner and outer limiting layers (31, 32), avoids the dog bone effect of the balloon 2, and increases the burst pressure of the balloon 2 to 40 atm or above. At the same time, the hollow design of the balloon 2 prevents the balloon 2 from blocking the blood vessel during expansion, can be placed for a long time, and plays the role of a temporary stent. Therefore, the balloon catheter described above has better therapeutic effect.
[0044] The above embodiments are only for illustrating the technical concept and characteristics of the present application, the purpose of which is to enable those skilled in the art to understand the content of the present application and 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 catheter, characterized by, The catheter (1) comprises: a balloon (2) sleeved on the outer periphery of the catheter (1) and capable of being inflated or deflated, the balloon (2) and the catheter (1) forming a flow channel (21) penetrating therebetween in an inflated state; a restriction layer comprising an outer restriction layer (31) covering the outer side of the balloon (2), the compliance of the outer restriction layer (31) being less than that of the balloon (2). The restriction layer further comprises an inner restriction layer (32) covering the inner side of the balloon (2), the compliance of the inner restriction layer (32) being less than that of the balloon (2).
2. The balloon catheter of claim 1, wherein, The restriction layer is in a mesh structure.
3. The balloon catheter of claim 1, wherein, The restriction layer is woven by organic polymer weaving filaments (311).
4. The balloon catheter of claim 3, wherein, The number of weaving nodes per inch of the restriction layer is 50-100; and / or, 5. The balloon catheter of claim 4, wherein, The restriction layer is woven by the organic polymer weaving filaments (311) in warp and weft. The material of the organic polymer weaving filaments (311) is ultra-high molecular weight polyethylene.
6. The balloon catheter of claim 4, wherein, The balloon (2) is in a hollow cylindrical shape in the inflated state.
7. The balloon catheter of claim 1, wherein, The balloon catheter further comprises a proximal connecting tube group and a distal connecting tube group, the proximal connecting tube group comprising a plurality of proximal connecting tubes (41) arranged circumferentially around the catheter (1), the proximal connecting tubes (41) being connected between the proximal end of the balloon (2) and the catheter (1); the distal connecting tube group comprising a plurality of distal connecting tubes (42) arranged circumferentially around the catheter (1), the distal connecting tubes (42) being connected between the distal end of the balloon (2) and the catheter (1).
8. The balloon catheter of claim 1, wherein, The catheter (1) has a filling lumen (12) communicating with the balloon (2) through at least one proximal connecting tube (41) in the proximal connecting tube group or one distal connecting tube (42) in the distal connecting tube group.
9. The balloon catheter of claim 8, wherein, The filling lumen (12) has a plurality of corresponding settings corresponding to the proximal connecting tubes (41) or the distal connecting tubes (42), each filling lumen (12) communicating with the balloon (2) through the corresponding proximal connecting tube (41) and / or distal connecting tube (42).
10. The balloon catheter of claim 9, wherein,