An ablation structure and an ultrasonic ablation catheter having the same

Abstract

The application relates to the technical field of medical devices, in particular to an ablation structure and an ultrasonic ablation catheter with the same. The ablation structure comprises a balloon, a support and an ultrasonic transducer. The balloon has a first opening, a second opening and a cavity for connecting the first opening and the second opening. The support is arranged in the cavity and connected with a first support body penetrating through the first opening and a second support body penetrating through the second opening. The ultrasonic transducer is arranged in the support and has a first end face and a second end face which emit ultrasonic waves towards the balloon in opposite directions. The application solves the problem that the ultrasonic ablation device deviates from the fixed position in vibration, leading to uneven ultrasonic waves emitted to both sides and inconsistent ablation degrees of the ablation points, thereby providing an ablation structure and an ultrasonic ablation catheter with the same.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to an ablation structure and an ultrasonic ablation catheter having the same. BACKGROUND

[0002] Cardiovascular diseases, especially over-activation of cardiovascular nerves, cause a large number of patients with heart disease and hypertension, which poses a great threat to people's life and health. The main means for treating over-activation of cardiovascular nerves include radiofrequency ablation, drug ablation and ultrasonic ablation, etc. Among them, ultrasonic ablation has a large number of clinical experiments and has achieved good results. However, in the existing ultrasonic ablation device, the ultrasonic ablation device is not stable enough in connection between the ultrasonic ablation device and the balloon, so that the ultrasonic ablation device deviates from the fixed position due to vibration during use, resulting in uneven ultrasonic waves emitted to both sides, and the ablation degree of the ablation point is inconsistent, which affects the ablation effect. SUMMARY

[0003] Therefore, the technical problem to be solved by the present application is to overcome the defects that the ultrasonic ablation device deviates from the fixed position due to vibration, resulting in uneven ultrasonic waves emitted to both sides and inconsistent ablation degree of the ablation point, so as to provide an ablation structure and an ultrasonic ablation catheter having the same.

[0004] In order to solve the above problems, the present application provides an ablation structure, comprising:

[0005] a balloon having a first opening, a second opening arranged oppositely and a cavity for communicating the first opening and the second opening;

[0006] a support arranged in the cavity and connected with a first support body penetrating through the first opening and a second support body penetrating through the second opening;

[0007] an ultrasonic transducer arranged in the support and having a first end face and a second end face facing the balloon and emitting ultrasonic waves in opposite directions.

[0008] Optionally, the support is provided with a support piece near the position of the first opening and the second opening, and the support piece is provided with a third opening allowing the end of the ultrasonic transducer to be inserted.

[0009] Optionally, the support is a cylinder arranged on the first support body and the second support body, and the support piece is a cylinder held in the inside of the cylinder.

[0010] Optionally, the support is provided with an open structure corresponding to the positions of the first end face and the second end face.

[0011] Optionally, the support, the ultrasonic transducer and the balloon are coaxially arranged.

[0012] Optionally, the ultrasonic transducer is a single crystal wafer transducer without backing.

[0013] Also provided is an ultrasonic ablation catheter comprising the ablation structure described above, and further comprising a handle arranged at the other end of the second support body.

[0014] Optionally, the first support body is a multi-lumen tube comprising at least two water channel passages and one wire channel passage arranged side by side, and at least one through hole is arranged in the side wall of each water channel passage of the first support body arranged in the balloon.

[0015] Optionally, the other end of the second support body penetrates through the second opening and extends to the outside of the balloon.

[0016] Optionally, the other end of the second support body is provided with an arc-shaped guide part.

[0017] The technical scheme of the present application has the following advantages:

[0018] 1. The ablation structure provided by the present application comprises a balloon, the balloon has a first opening, a second opening and a cavity for connecting the first opening and the second opening arranged oppositely; a support arranged in the cavity is connected with a first support body penetrating through the first opening and a second support body penetrating through the second opening; an ultrasonic transducer arranged in the support has a first end face and a second end face for emitting ultrasonic waves in opposite directions towards the balloon. The support in the cavity supports the balloon by connecting with the first support body and the second support body, and the support is used for fixing the ultrasonic transducer. The ultrasonic transducer arranged in the support emits ultrasonic waves in two directions through the first end face and the second end face. The ultrasonic transducer in the support can stably emit ultrasonic waves due to the limiting effect of the support, and even if vibration occurs, it can be eliminated by the support and the support bodies at both ends of the support, thereby ensuring that the ultrasonic transducer emits uniform ultrasonic waves in opposite two directions to achieve consistency of the ablation degree of the ablation point.

[0019] 2. The ablation structure provided by the present application, a support member is arranged at the position of the support close to the first opening and the second opening, and a third opening allowing the end of the ultrasonic transducer to be inserted is arranged on the support member. The third opening of the support member accommodates the insertion of the ultrasonic transducer, and the design of the support member further reduces the vibration amplitude of the ultrasonic transducer when it is subjected to vibration, so that the ultrasonic transducer is more stable in use.

[0020] 3. The ablation structure provided by the present application, the support is a cylinder sleeve arranged on the first support body and the second support body, and the support member is a cylinder clamped in the inside of the cylinder. The support member and the support are both circular to realize the contact between them to the greatest extent, so that the vibration generated by the ultrasonic transducer can be dispersed in the circumferential direction, further reducing the vibration amplitude of the ultrasonic transducer in use.

[0021] 4. The ablation structure provided by the present application, the stent is provided with an opening corresponding to the position of the first end face and the second end face. The opening of the stent makes the ultrasonic waves emitted by the first end face and the second end face not be blocked by the stent, so as to smoothly reach the part to be ablated and reduce the energy loss to the maximum.

[0022] 5. The ablation structure provided by the present application, the stent, the ultrasonic transducer and the balloon are coaxially arranged, the coaxial arrangement is to make the stent and the ultrasonic transducer be located in the middle position of the balloon, so as to ensure that the distance from the first end face and the second end face of the ultrasonic transducer to the part to be ablated is the same, ensure that the ultrasonic transducer will not be in contact with the inner wall of the blood vessel to cause burn, and ensure the consistency of energy output.

[0023] 6. The ablation structure provided by the present application, the ultrasonic transducer is a single crystal wafer transducer without backing, so as to ensure that the transducer is without backing, the energy originally consumed in the backing material is emitted as ultrasonic energy, the electroacoustic conversion efficiency is improved, the electric-thermal conversion energy is reduced, even in the working of the ultrasonic transducer, the stent will not be heated, and the safety in use is further improved. At the same time, the design of the ultrasonic transducer without backing makes it unnecessary to add backing in the ultrasonic transducer, the size of the ultrasonic transducer itself is reduced, the size of the stent and the ablation structure is further reduced, the passing performance of the ablation structure through the lesion site is improved to adapt to thinner blood vessels, the friction with the blood vessel caused by the ablation structure is effectively reduced, the pain of the patient is reduced, the passing performance and safety in the blood vessel are improved.

[0024] 7. The ultrasonic ablation catheter provided by the present application, comprising the ablation structure, further comprising a handle provided on the other end of the first support body. The first support body is connected with the stent and the handle respectively, so as to facilitate the medical staff to operate the handle to control the ultrasonic transducer in the stent and the balloon.

[0025] 8. The ultrasonic ablation catheter provided by the present application, the first support body is a multi-lumen tube, comprising at least two water channels and a wire channel arranged side by side, and at least one through hole is formed in the side wall of each water channel of the first support body provided in the balloon. The wire channel in the multi-lumen tube is convenient for the medical staff to insert the wire into the wire channel to control the ultrasonic transducer, and the side wall of the water channel of the first support body in the balloon is provided with at least one through hole, so that the water entering from one water channel enters the balloon through the through hole in the side wall of the water channel, and the water in the balloon flows into the other water channel through the through hole in the side wall of the other water channel, realizing the circulation of water.

[0026] 9. The ultrasonic ablation catheter provided by the present application, the other end of the second support body is provided with an arc-shaped guide part, the design of the arc-shaped guide part makes the resistance of the ablation structure entering the blood vessel to be the minimum, reduces the resistance of the second support body and the balloon, and improves the passing performance of the second support body and the balloon. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a three-dimensional structural diagram of the ultrasonic ablation catheter provided in an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the planar structure of the ultrasonic ablation catheter provided in an embodiment of the present invention;

[0030] Figure 3 for Figure 2 The sectional view along line A-A shown;

[0031] Figure 4 for Figure 2 The sectional view along line B-B shown;

[0032] Figure 5 for Figure 2 The sectional view along the C-C direction shown;

[0033] Figure 6 This is a schematic diagram of the ultrasonic ablation catheter provided in the embodiments of the present invention in practical application;

[0034] Figure 7 This is a three-dimensional structural diagram of the stent for the ultrasonic ablation catheter provided in an embodiment of the present invention;

[0035] Figure 8 This is a three-dimensional structural diagram of the support member of the ultrasonic ablation catheter provided in an embodiment of the present invention.

[0036] Explanation of reference numerals in the attached drawings: 1. Ablation structure; 2. First support; 3. Handle; 101. Second support; 102. Balloon; 103. Stent; 104. Ultrasonic transducer; 105. Support component; 201. First water channel; 202. Second water channel; 203. Lead channel; 401. Arterial wall; 402. Aorta; 403. Renal artery. Detailed Implementation

[0037] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0041] like Figure 1 - Figure 8 One specific embodiment of the ultrasonic ablation catheter shown includes: a first support body 2, and handles 3 and ablation structures 1 respectively disposed at both ends of the first support body 2. Specifically, the first support body 2 is a three-lumen tube.

[0042] like Figure 2 , Figure 3 As shown, the ablation structure 1 includes a balloon 102, which has a first opening, a second opening, and a cavity for connecting the first opening and the second opening. A support 103 and an ultrasonic transducer 104 are disposed within the cavity. The support 103, the ultrasonic transducer 104, and the balloon 102 are coaxially arranged. The support 103 is connected to a first support 2 penetrating the first opening and a second support 101 penetrating the second opening.

[0043] like Figure 3 , Figure 5 , Figure 7and Figure 8 As shown, a support member 105 is provided on each of the brackets 103 near the first opening and the second opening, such as... Figure 7 , Figure 8 As shown, the bracket 103 is a cylindrical body sleeved on the first support body 2 and the second support body 101. The support member 105 is a cylinder that is held inside the cylinder, that is, the outer diameter of the support member 105 is equal to the inner diameter of the cylinder to ensure that the support member 105 is firmly installed in the cylinder. The support member 105 has a third opening inside to allow the insertion of the ultrasonic transducer 104. The third opening is rectangular and its size is adapted to the ultrasonic transducer 104. The two ends of the ultrasonic transducer 104 are connected to the support member 105 through the third opening.

[0044] Specifically, the ultrasonic transducer 104 is a backingless monocrystalline transducer with a first end face and a second end face that emit ultrasonic waves toward the balloon 102 and in the opposite direction. The support 103 is open at the corresponding positions of the first and second end faces of the ultrasonic transducer 104, that is, the corresponding positions of the side wall of the cylinder are hollowed out to allow the ultrasonic waves emitted by the ultrasonic transducer 104 to be emitted directly.

[0045] like Figure 4 As shown, the first support 2 is a multi-lumen tube with two water channels and one wire channel 203 arranged side by side inside. Both water channels and the wire channel 203 extend axially along the tube body. Each water channel of the second support 101, located inside the balloon 102, has a through hole on its side wall. A wire is installed inside the wire channel 203, with one end connected to the ultrasonic transducer 104 and the other end connected to the controller in the handle 3. The outer wall of the first support 2 is welded to the inner wall of the balloon 102, inserted into the cavity of the support 103, and fixed together by adhesive. The second support 101 is the tip of the catheter, as shown... Figure 2 , Figure 3 As shown, one end of the second support 101 is inserted into the inner cavity of the stent 103 and fixed together by adhesive. The other end extends through the second opening to the outside of the balloon 102. The outer surface of the second support 101 is connected to the balloon 102 by welding. The other end of the second support 101 extending to the outside of the balloon is provided with an arc-shaped guide portion. The second support 101 is made of a highly elastic and soft polymer material, while the stent 103 is made of a high-strength medical metal material.

[0046] like Figure 1 , Figure 6 As shown, the handle 3 is connected to the first support body 2 and is provided with a water inlet, a water outlet and a wire inlet. The water inlet and the water outlet are respectively connected to two water channels, and the wire inlet is connected to the wire channel 203.

[0047] In the specific use process, the medical staff operates the ablation structure 1 to enter the renal artery 403 through the iliac artery and the aorta 402, injects circulating water through the water inlet at the handle 3, and the circulating water enters the balloon 102 through the through hole of the first water channel 201, so that the balloon 102 is filled and kept at a certain pressure, and then reaches the water outlet through the through hole of the second water channel 202, so as to keep the water pressure in the balloon 102 and make the water in the balloon 102 circulate. Then, energy is transmitted to the ultrasonic transducer 104 through the wire, the ultrasonic transducer 104 converts the electric energy into ultrasonic energy, transmits the ultrasonic energy to the renal artery blood vessel wall 401 through the circulating water in the balloon 102, and continuously transmits outward, so that the ultrasonic energy finally acts on the sympathetic nerve in the renal artery blood vessel wall 401, activates the sympathetic nerve ablation, and achieves the ablation purpose.

[0048] The ultrasonic transducer 104 in the ablation structure 1 provided by the application is coaxially arranged with the balloon 102 through the support 103, so that the ultrasonic transducer 104 is located at the center position of the balloon 102, the contact between the ultrasonic transducer 104 and the inner wall of the blood vessel is avoided, and the burning of the blood vessel is eliminated; the ultrasonic transducer 104 is connected with the support 103 through the support 105, so that the balloon 102 wraps the support 103 and the ultrasonic transducer 104, the biocompatibility is improved, the stability of the ultrasonic transducer 104 in the work is improved, the same distance of the energy emission of the ultrasonic transducer 104 to two directions of the blood vessel is ensured, and the consistency of the energy output is ensured. The ultrasonic transducer 104 provided by the application adopts a single-chip transducer, the ultrasonic energy emitted from two surfaces of the single-chip transducer is relatively consistent, the ablation degrees of two surfaces are kept consistent, the ablation degrees of each ablation point are kept consistent, and the problem of missed ablation is avoided; the ultrasonic transducer 104 of the ablation structure 1 provided by the application adopts a non-backing structure, the electric energy transmitted to the ultrasonic transducer 104 can be converted into ultrasonic energy to the maximum extent, the heating of the ultrasonic transducer 104 is reduced, the electric-acoustic conversion efficiency is improved, the design of the backing material of the ultrasonic transducer 104 reduces the size of the ultrasonic transducer 104, the design size of the support 103 and the balloon 102 is smaller, the passability in the interventional surgery is better, the damage to the blood vessel wall is effectively reduced, the friction between the ablation structure and the blood vessel caused by the ablation structure is effectively reduced, the pain of the patient is effectively alleviated, and the ultrasonic transducer 104 has the advantages of ingenious structure design, high safety, and good ablation effect.

[0049] As an alternative embodiment, the second support body 101 can also be a solid high polymer material or a hollow tube.

[0050] As an alternative embodiment, the ultrasonic ablation catheter of the application can also be applicable to other parts of the human body.

[0051] As an alternative embodiment, the first support body 2 can also be a two-lumen tube, a four-lumen tube or other multi-lumen tubes.

[0052] Obviously, the above embodiments are merely example for clearly illustrating but not limitation to the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments need not and can not be enumerated. The obvious changes or variations derived from this still fall within the protection scope of the present application.

Claims

1. An ablation structure, characterized in that, include: The balloon (102) has a first opening and a second opening disposed opposite to each other and a cavity for communicating with the first opening and the second opening; A bracket (103) is disposed in the cavity and connected to a first support (2) that passes through the first opening and a second support (101) that passes through the second opening; An ultrasonic transducer (104) is disposed in the support (103) and has a first end face and a second end face that face the balloon and emit ultrasonic waves in the opposite direction. The bracket (103) is provided with a support member (105) near the first opening and the second opening, and the support member (105) is provided with a third opening that allows the end of the ultrasonic transducer (104) to be inserted. The bracket (103) is a cylinder sleeved on the first support body (2) and the second support body (101), and the support member (105) is a cylinder held inside the cylinder; The bracket (103) is open at the positions corresponding to the first end face and the second end face; The stent (103), ultrasonic transducer (104), and balloon (102) are coaxially arranged; The ultrasonic transducer (104) is a single-crystal transducer without a backing.

2. An ultrasonic ablation catheter, characterized in that, The ablation structure as described in claim 1 also includes a handle (3) located at the other end of the first support (2).

3. The ultrasonic ablation catheter according to claim 2, characterized in that, The first support (2) is a multi-cavity tube, including at least two water channels and one wire channel (203) arranged side by side. Each water channel of the first support (2) located in the balloon (102) has at least one through hole on its side wall.

4. The ultrasonic ablation catheter according to claim 3, characterized in that, The other end of the second support (101) passes through the second opening and extends to the outside of the balloon (102).

5. The ultrasonic ablation catheter according to claim 4, characterized in that, The other end of the second support (101) is provided with an arc-shaped guide.

Images