An ablation catheter and ablation apparatus
By setting a limiting component on the expansion member, the problem of axial offset of the flexible circuit board is solved, ensuring stable contact between the ablation catheter and the inner wall of the duodenum, thus improving the efficacy and safety of ablation treatment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI GELUKE MEDICAL TECHNOLOGY CO LTD
- Filing Date
- 2025-06-09
- Publication Date
- 2026-06-19
AI Technical Summary
Undesirable displacement of the flexible circuit board in the axial direction of the expansion member affects the ablation effect of the lesion mucosa on the inner wall of the duodenum.
A limiting component is provided on the expansion member, including a first limiting member and a second limiting member or limiting block, to limit the axial displacement of the movable end of the flexible circuit board along the expansion member, so as to ensure that it can stably abut against the inner wall of the duodenum in both the expanded and unexpanded states.
It effectively prevents the flexible circuit board from shifting axially in the expansion member, ensuring the stability and accuracy of the ablation effect, avoiding damage to the inner wall, and improving the reliability of ablation treatment.
Smart Images
Figure CN224369959U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of medical devices, and in particular relates to an ablation catheter and ablation device. Background Technology
[0002] Type 2 diabetes is a complex metabolic disease. Its mechanism involves insulin resistance (the body's cells cannot properly use the insulin they produce) and insufficient insulin production to meet the body's needs, leading to hyperglycemia. This, in turn, causes the body's autoimmune system to destroy pancreatic beta cells, resulting in the body's inability to produce enough insulin.
[0003] To treat type 2 diabetes, an ablation catheter can be inserted into the duodenum using an ablation device. An expansion component is used to expand a flexible circuit board, allowing it to adhere to the duodenal wall. Then, an energy delivery unit supplies energy to the flexible circuit board, ablating the diseased mucosa on the duodenal wall. After ablation, a mucosal recovery and healing response is triggered, rebuilding healthy mucosal tissue to achieve the goal of treating type 2 diabetes.
[0004] Flexible circuit boards are typically spiral-shaped structures, with one end fixed to an expansion member. They can move along the axial direction of the expansion member under its action, thereby abutting the flexible circuit board against the inner wall of the duodenum.
[0005] However, since one end (fixed end) of the flexible circuit board is fixed and the other end (movable end) is not fixed, when the expansion member changes between the expanded state and the unexpanded state, the movable end of the flexible circuit board will deviate undesirably in the axial direction of the expansion member. This causes the contact point between the flexible circuit board and the inner wall of the duodenum to change from the expected contact point, affecting the ablation effect on the lesion mucosa of the inner wall of the duodenum. Utility Model Content
[0006] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide an ablation catheter and ablation device to solve the problem of undesirable displacement of flexible circuit boards in the axial direction of expansion members in the prior art.
[0007] To achieve the above and other related objectives, this utility model provides an ablation catheter, comprising: a catheter body, an expansion member, a flexible circuit board, and a limiting component; the expansion member is disposed at the distal end of the catheter body; the fixed end of the flexible circuit board is connected to the expansion member, and the flexible circuit board unfolds or rolls up along the circumference of the expansion member under the action of the expansion member; the limiting component is disposed on the expansion member to limit the axial displacement of the movable end of the flexible circuit board along the expansion member.
[0008] Optionally, the limiting component includes a first limiting member and a second limiting member; the first limiting member and the second limiting member are spaced apart on the expansion member, and the flexible circuit board is located between the first limiting member and the second limiting member; in the unexpanded state, the diameter of the first limiting member and the diameter of the second limiting member are larger than the diameter of the expansion member.
[0009] Optionally, the limiting component and the expansion component are integrally formed. The expansion component includes a first limiting part, a second limiting part, and a winding part. The first limiting part and the second limiting part are spaced apart on the winding part. The fixed end of the flexible circuit board is connected to the winding part, and the flexible circuit board is located between the first limiting part and the second limiting part. In the unexpanded state, the diameter of the first limiting part and the second limiting part is larger than the diameter of the winding part.
[0010] Optionally, the thickness of the first limiting part and the second limiting part is greater than the thickness of the winding part.
[0011] Optionally, the thickness of the first limiting part and the second limiting part is greater than or equal to the thickness of the flexible circuit board.
[0012] Optionally, the limiting component includes limiting blocks disposed on the upper and lower sides of the fixed end of the flexible circuit board.
[0013] Optionally, the flexible circuit board includes at least one set of electrodes, and each set of electrodes is provided with at least two copper foils; the center distance between two adjacent copper foils of each set of electrodes is A mm, the width of the copper foil is B mm, and the relationship between the center distance A between two adjacent copper foils of each set of electrodes and the width B of the copper foil is 3 / 4A≥B≥1 / 20A.
[0014] Optionally, the distance between two adjacent copper foils of two adjacent sets of electrodes is C mm, where 4A≧C≧1 / 3 (AB).
[0015] Optionally, the center distance A between two adjacent copper foils on each electrode group can range from 0.3 mm to 4 mm.
[0016] On the other hand, the present invention also provides an ablation device, including an ablation catheter as described above, and a medium supply component connected to an expansion member for switching the expansion member between an expanded state and a non-expanded state.
[0017] As described above, the ablation catheter and ablation device of this utility model have at least the following beneficial effects: by providing a limiting component on the expansion member, the limiting component limits the movable end of the flexible circuit board in the axial direction of the expansion member, so as to prevent the movable end of the flexible circuit board from being deviated in the axial direction of the expansion member, and avoid the deviation of the contact position between the flexible circuit board and the inner wall of the duodenum. Attached Figure Description
[0018] Figure 1 The diagram shown is a structural schematic of one implementation of an ablation catheter according to the present invention, in which the expansion member is in an unexpanded state.
[0019] Figure 2 The diagram shown is a structural schematic of one implementation of an ablation catheter according to the present invention, in which the expansion member is in an expanded state.
[0020] Figure 3 The diagram shows another implementation of the ablation catheter of this utility model, in which the expansion member is in an unexpanded state.
[0021] Figure 4 The diagram shows another implementation of the ablation catheter of this utility model, in which the expansion member is in an expanded state.
[0022] Figure 5 The diagram shows a flexible circuit board structure, representing another implementation of an ablation catheter according to this invention.
[0023] Figure 6 This is a partial structural diagram of the flexible circuit board of an ablation catheter according to the present invention, used to show the distance between the copper foils of two adjacent sets of electrodes.
[0024] Component labeling: 1. Catheter body, 2. Expansion member, 21. First limiting part, 22. Second limiting part, 23. Winding part, 3. Flexible circuit board, 4. Limiting assembly, 41. First limiting member, 42. Second limiting member, 43. Limiting block. Detailed Implementation
[0025] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.
[0026] Please refer to all the accompanying drawings below. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.
[0027] The terms "distal" and "proximal" used in this invention are merely for better understanding of the invention and should not be construed as limiting the invention. Typically, during the use of an ablation device, the distal portion of the device extends into the body, while the proximal portion remains outside the body so that the operator can hold the handle for operation. Therefore, "distal" can be understood as the part of the ablation device that is relatively close to the body, and "proximal" can be understood as the part of the ablation device that is relatively close to the body.
[0028] The following embodiments are for illustrative purposes only. These embodiments can be combined and are not limited to the content shown in any single embodiment below.
[0029] Please see Figure 1-4 This utility model provides an ablation catheter, including: a catheter body 1, an expansion member 2, a flexible circuit board 3, and a limiting component 4; the expansion member 2 is disposed at the distal end of the catheter body 1; the fixed end of the flexible circuit board 3 is connected to the expansion member 2, and the flexible circuit board 3 unfolds or rolls up along the circumference of the expansion member 2 under the action of the expansion member 2; the limiting component 4 is disposed on the expansion member 2 and is used to limit the movable end of the flexible circuit board 3 from shifting along the axial direction of the expansion member 2.
[0030] The expansion member 2 can be a balloon, which can be a compliant balloon or a non-compliant balloon. In this embodiment, the balloon is a compliant balloon. The compliant balloon material is soft, which can avoid scratching the inner wall mucosa of the duodenum. The balloon includes an inner layer, an outer layer, and a receiving cavity between the inner and outer layers for containing the medium. When a medium such as gas or liquid is introduced into the receiving cavity, the outer layer of the balloon can undergo elastic deformation to inflate the balloon. The balloon can be sleeved on the outer wall of the catheter body 1, and the inner layer of the balloon and the catheter body 1 can be fixed together by means of adhesive or other methods to prevent the balloon from detaching from the catheter body 1 during use.
[0031] Please see Figure 3 The limiting component 4 can be directly disposed on the expansion member 2. Specifically, the limiting component 4 may include a first limiting member 41 and a second limiting member 42. The first limiting member 41 and the second limiting member 42 are disposed at intervals on the expansion member 2, and the flexible circuit board 3 is located between the first limiting member 41 and the second limiting member 42. In the unexpanded state, the diameter of the first limiting member 41 and the diameter of the second limiting member 42 are larger than the diameter of the expansion member 2. The first limiting member 41 and the second limiting member 42 can be cap-shaped structures. The first limiting member 41 is disposed at the distal end of the expansion member 2, and the second limiting member 42 is disposed at the proximal end of the expansion member 2. The first limiting member 41 and the second limiting member 42 are sleeved and fixed on the expansion member 2 by means of adhesive bonding or other methods. In this way, the first limiting member 41 and the second limiting member 42 form a limiting structure on the expansion member 2 for limiting the flexible circuit board 3, so as to prevent the movable end of the flexible circuit board 3 from shifting in the axial direction of the expansion member 2.
[0032] Please see Figure 1-2 The limiting component 4 can also be integrally formed with the expansion member 2. Specifically, the expansion member 2 includes a first limiting part 21, a second limiting part 22, and a winding part 23. The first limiting part 21 is provided at the distal end of the expansion member 2, and the second limiting part 22 is provided at the proximal end of the expansion member 2. The fixed end of the flexible circuit board 3 and the winding part 23 can be connected together by bonding or other means. The first limiting part 21 and the second limiting part 22 form the limiting component 4 to prevent the movable end of the flexible circuit board 3 from shifting axially in the expansion member 2.
[0033] When the balloon is in its uninflated state, the flexible circuit board 3 is wound around the winding part 23 in a multi-layered vortex structure. When the balloon changes between its uninflated and inflated states, the movable end of the flexible circuit board 3 moves circumferentially around the body of the expansion member 2 to adapt to the change in diameter of the body of the expansion member 2 of the balloon.
[0034] When the balloon is in its uninflated state, the diameters of the first limiting portion 21 and the second limiting portion 22 are larger than the diameter of the body of the dilatation member 2. This allows the flexible circuit board 3 to avoid contact with the inner wall of the duodenum, preventing damage to the inner wall of the duodenum. Furthermore, the first limiting portion 21 and the second limiting portion 22 also limit the flexible circuit board 3 during the transition between the uninflated and inflated states, ensuring that the flexible circuit board 3 can return to its multi-layered spiral shape and preventing the movable end of the flexible circuit board 3 from shifting axially in the dilatation member 2.
[0035] When the balloon is inflated, the diameter of the winding portion 23 can be greater than or equal to the diameter of the first limiting portion 21 and the second limiting portion 22 to ensure that the flexible circuit board 3 can abut against the inner wall of the duodenum.
[0036] The thickness of the winding portion 23 is less than the thickness of the first limiting portion 21 and the second limiting portion 22 to ensure that the diameter of the expansion member 2 body in the expanded state is greater than or equal to the diameter of the first limiting portion 21 and the second limiting portion 22. Furthermore, the difference between the thickness of the first limiting portion 21 and the second limiting portion 22 and the thickness of the winding portion 23 is not less than 0.5 mm, for example, 0.6 mm, 0.8 mm, 0.9 mm, or 1 mm. Additionally, the thickness of the first limiting portion 21 and the second limiting portion 22 is greater than or equal to the thickness of the flexible circuit board 3 to ensure that the expansion member 2 can be used normally.
[0037] The width of the flexible circuit board 3 is greater than or equal to 10mm, such as 10mm, 11mm, 12mm, 15mm, etc., to reduce the number of ablation cycles.
[0038] Please see Figure 4-5 The limiting component 4 can also be indirectly disposed on the expansion member 2. Specifically, the limiting component 4 includes a limiting block 43. Limiting blocks 43 are respectively disposed on the upper and lower sides of the fixed end of the flexible circuit board 3. The limiting block 43 can be attached to the fixed end of the flexible circuit board 3 by means of glue or other methods after the flexible circuit board 3 is processed into a vortex structure. It is used to limit the axial displacement of the movable end of the flexible circuit board 3 in the expansion member 2. The limiting block 43 can be made of a material such as silicone with a certain degree of elasticity so that when the limiting block 43 abuts against the inner wall of the duodenum, the limiting block 43 will not scratch the inner wall of the duodenum.
[0039] Please see Figure 6 The flexible circuit board 3 includes at least one set of electrodes, each set of electrodes having at least two copper foils. Each set of electrodes may include a positive electrode and a negative electrode, which are electrically connected to an energy supply component. In use, the energy supply component can simultaneously supply energy to multiple sets of electrodes, or supply energy to each set of electrodes individually or one by one, to ablate lesions on the inner wall of the duodenum. The center-to-center distance between two adjacent copper foils on each set of electrodes is A mm, and the width of the copper foil is B mm. The relationship between the center-to-center distance A and the width B on each set of electrodes is 3 / 4A ≥ B ≥ 1 / 20A. The center-to-center distance A on each set of electrodes ranges from 0.3 mm to 4 mm, specifically 0.35 mm. This ensures that during use, there are no gaps (i.e., ablation blind spots) or narrowing within the ablation area formed by each set of electrodes.
[0040] The distance between two adjacent copper foils of two sets of electrodes is C mm, where 4A ≧ C ≧ 1 / 3 (AB). By setting the distance between two adjacent copper foils of the two sets of electrodes, a complete ablation area can be formed by ablation of the lesion mucosa on the inner wall of the duodenum using the ablation device. This avoids the problem of the inner wall of the duodenum not being ablated due to the distance between the copper foils of the two sets of electrodes being too large, and also avoids the problem of narrowing between the two ablation areas.
[0041] On the other hand, the present invention also provides an ablation device, including an ablation catheter as described above, and a medium supply component, which is connected to the expansion member 2 and is used to supply a medium such as gas or liquid into the receiving cavity of the expansion member 2, so that the expansion member 2 can switch between the expanded state and the non-expanded state.
[0042] The ablation device may also include an energy supply component connected to the flexible circuit board 3 for supplying energy to the flexible circuit board 3 to achieve ablation of the lesion mucosa on the inner wall of the duodenum.
[0043] In summary, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.
[0044] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.
Claims
1. An ablation catheter, characterized in that, include: The catheter body, dilation component, flexible circuit board, and limiting assembly; The expansion member is disposed at the distal end of the catheter body; The fixed end of the flexible circuit board is connected to the expansion member, and the flexible circuit board unfolds or rolls up along the circumference of the expansion member under the action of the expansion member. The limiting component is disposed on the expansion member and is used to limit the axial displacement of the movable end of the flexible circuit board along the expansion member.
2. The ablation catheter according to claim 1, characterized in that: The limiting component includes a first limiting member and a second limiting member; the first limiting member and the second limiting member are spaced apart on the expansion member, and the flexible circuit board is located between the first limiting member and the second limiting member; In the unexpanded state, the diameters of the first limiting member and the second limiting member are larger than the diameter of the expansion member.
3. The ablation catheter according to claim 1, characterized in that: The limiting component is integrally formed with the expansion member. The expansion member includes a first limiting part, a second limiting part, and a winding part. The first limiting part and the second limiting part are spaced apart on the winding part. The fixed end of the flexible circuit board is connected to the winding part, and the flexible circuit board is located between the first limiting part and the second limiting part. In the unexpanded state, the diameters of the first limiting portion and the second limiting portion of the expansion member are larger than the diameter of the winding portion.
4. An ablation catheter according to claim 3, characterized in that: The thickness of the first limiting part and the second limiting part is greater than the thickness of the winding part.
5. An ablation catheter according to claim 4, characterized in that: The thickness of the first limiting part and the second limiting part is greater than or equal to the thickness of the flexible circuit board.
6. An ablation catheter according to claim 1, characterized in that: The limiting component includes limiting blocks disposed on the upper and lower sides of the fixed end of the flexible circuit board.
7. An ablation catheter according to claim 1, characterized in that: The flexible circuit board includes at least one set of electrodes, and each set of electrodes is provided with at least two copper foils; The center distance between two adjacent copper foils of each electrode group is A mm, and the width of the copper foil is B mm. The relationship between the center distance A between two adjacent copper foils of each electrode group and the width B of the copper foil is 3 / 4A≥B≥1 / 20A.
8. An ablation catheter according to claim 7, characterized in that: The distance between two adjacent copper foils of two adjacent groups of electrodes is C mm, where 4A ≥ C ≥ 1 / 3 (AB).
9. An ablation catheter according to claim 8, characterized in that: The center distance A between two adjacent copper foils on each electrode group ranges from 0.3 mm to 4 mm.
10. An ablation device, characterized in that, The ablation catheter as described in any one of claims 1-9 further includes a media supply assembly connected to the expansion member for switching the expansion member between the expanded state and the non-expanded state.