WO2020253739A1

WO2020253739A1 - Medical balloon, balloon catheter and medical device

Info

Publication number: WO2020253739A1
Application number: PCT/CN2020/096642
Authority: WO
Inventors: 刘云云; 李明华; 谢志永; �田�浩; 寸雨曦
Original assignee: 微创神通医疗科技（上海）有限公司
Priority date: 2019-06-18
Filing date: 2020-06-17
Publication date: 2020-12-24
Also published as: CN112089951A

Abstract

Provided are a medical balloon (10), a balloon catheter and a medical device (30). The medical balloon (10) comprises a balloon body and recesses (12) formed in an outer surface of the balloon body. The advantage thereof lies in that by means of the recesses (12), the bending performance of the medical balloon (10) is improved, and the adaptability of the medical balloon (10) to a blood vessel (20) is improved, thereby reducing the tearing of the blood vessel (20) when the medical balloon (10) is delivered into a bent portion of the blood vessel (20), so as to prevent the blood vessel (20) from being damaged.

Description

Medical balloon, balloon catheter and medical device

Technical field

The present invention relates to the technical field of medical equipment, in particular to a medical balloon, a balloon catheter and a medical device.

Background technique

With the rapid development of medical technology, interventional therapy has become a pillar subject alongside internal medicine and surgery. Balloon dilatation is an important technology in the field of interventional therapy and is widely used in coronary heart disease, cerebral thrombosis, and aneurysm lesions. And other diseases are being treated. Medical balloons need to have better support performance to achieve the treatment of diseased blood vessels.

The traditional medical balloon has a cylindrical structure, and its bending performance is not good. Therefore, the medical balloon has poor compliance with the blood vessel during the process of reaching the diseased position through the curved blood vessel, and the pushing resistance is large. Fig. 1 shows a blood vessel 1 with a disease. The radius of curvature r of the blood vessel 1 at the location of the disease is α. As shown in Figure 2, the linear medical balloon 2 is fed into the blood vessel 1 through the catheter 3. When the medical balloon 2 reaches the lesion position, the medical balloon 2 expands, but it cannot adapt to the blood vessel 1 itself. Shape, so the medical balloon 2 stretches the blood vessel 1 so that the radius of curvature r of the blood vessel 1 increases to β, which in turn causes excessive tearing of the blood vessel 1 in the areas A and B in Fig. 2, causing the blood vessel 1 to tear or tear Spasms. At the same time, the stress in the B area is relatively concentrated, which easily causes the connection point of the medical balloon 2 and the catheter 3 to be discounted.

Therefore, it is necessary to design a medical balloon that has a certain support strength to treat luminal lesions, but also has better compliance and bending ability to avoid damage to blood vessels and improve medical devices The therapeutic effect.

Summary of the invention

The purpose of the present invention is to provide a medical balloon, a balloon catheter and a medical device. The medical balloon of the present invention has good bending performance, can adapt well to the shape of blood vessels, and avoid excessive tearing of blood vessels.

In order to achieve the above objective, the present invention provides a medical balloon, which includes a balloon body and a recess formed on the outer surface of the balloon body.

Optionally, the recessed portion extends along the circumferential direction of the balloon body.

Optionally, the recessed portion is a continuous annular groove, or the recessed portion includes at least two sub-recessed portions spaced apart along the circumference of the balloon body.

Optionally, more than two recesses are formed on the outer surface of the balloon body, each of the recesses extends along the circumferential direction of the balloon body, and the two or more recesses are along the The balloon bodies are arranged sequentially in the axial direction.

Optionally, the concave portion has a spiral structure and spirally surrounds along the axis of the balloon body.

Optionally, the recess includes at least two sub-recesses in a spiral structure, at least two of the sub-recesses are arranged in sequence along the axial direction of the balloon body and connected to each other, and the two connected sub-recesses The direction of rotation of the depression is opposite.

Optionally, the recess includes at least two sub-recesses in a spiral structure, and at least two of the sub-recesses are spaced apart along the axial direction of the balloon body

Optionally, on the axial section of the medical balloon, the shape of the recessed portion is at least one of an arc, a square, a trapezoid, or a V-shape.

Optionally, when the medical balloon is in an expanded state, the outer diameter of the balloon body is tapered from the proximal end to the distal end.

In addition, in order to achieve the above object, the present invention provides a balloon catheter, which includes the medical balloon as described above and a catheter connected to the proximal end of the medical balloon.

In addition, in order to achieve the above-mentioned object, the present invention provides a medical device, which includes the aforementioned balloon catheter and a stent crimped on the medical balloon of the balloon catheter.

Optionally, the stent has a pipe network structure and includes a pole and a connecting rod connected to each other along the axial direction of the stent;

Wherein, when the stent and the medical balloon are in an expanded state, at least a part of the probe is positioned on the balloon body of the medical balloon.

Optionally, when the stent and the medical balloon are in an expanded state, the connecting rod is positioned at a recess of the medical balloon.

Optionally, both ends of the wave rod are respectively positioned on the balloon body on both sides of the recessed portion, and the length of the two ends of the wave rod positioned on the balloon body is not less than 0.5mm.

Optionally, the lengths of the two end portions of the probes positioned on the balloon body are equal.

Optionally, one end of the wave rod is positioned on the balloon body on one side of the recessed portion, the other end is positioned at the recessed portion, and the wave rod is positioned on the balloon body The length of is not less than 1/2 of the full length of the pole.

Optionally, all the wave rods are positioned on the balloon body.

Compared with the prior art, the medical balloon, balloon catheter and medical device of the present invention have the following advantages:

The medical balloon of the present invention includes a balloon body and a concave portion formed on the outer surface of the balloon body. The concave portion improves the bending performance of the medical balloon, thereby improving its bending ability to better adapt to blood vessels Its shape reduces the damage of blood vessels caused by excessive tearing of blood vessels.

Description of the drawings

Figure 1 is a schematic diagram of the structure of a diseased blood vessel;

2 is a schematic diagram of a cylindrical medical balloon in the prior art being delivered into a diseased blood vessel;

Figures 3a and 3b are structural schematic diagrams of a medical balloon provided according to an embodiment of the present invention. The recessed portion shown in Figure 3a includes a plurality of sub-recessed portions spaced along the circumference of the balloon body, as shown in Figure 3b. The depression is a continuous annular groove;

Figure 4 is a schematic diagram of the medical balloon shown in Figure 3b when it is delivered into a diseased blood vessel;

5a to 5e are schematic diagrams of various deformed structures of the medical balloon shown in FIG. 3b;

Fig. 6 is a schematic diagram of the bending principle of the medical balloon shown in Fig. 3b, in which only a circle of recesses is shown;

Fig. 7 is a schematic diagram of the bending principle of the medical balloon shown in Fig. 5c;

8a and 8b are structural schematic diagrams of a medical balloon provided according to another embodiment of the present invention, wherein the balloon body of the medical balloon shown in FIG. 8a is formed with a spiral structure recessed portion, as shown in FIG. 8b Two sub-recesses in a spiral structure are formed on the balloon body of the medical balloon of, and the rotation directions of the two sub-recesses are the same;

Fig. 9 is a schematic structural diagram of a medical device provided according to an embodiment of the present invention;

10 is a schematic diagram of the positional relationship between the stent and the medical balloon in the medical device according to an embodiment of the present invention;

Fig. 11 is an enlarged schematic diagram of C in Fig. 10;

Fig. 12 is a schematic diagram of another positioning method of the stent of the medical device in Fig. 10;

13 is a schematic diagram of the positional relationship between the stent and the medical balloon in the medical device according to another embodiment of the present invention;

Fig. 14 is an enlarged schematic view of D in Fig. 13.

In the figure:

10. 2-Medical balloon;

11-sub-balloon, 12-depression; 121-sub-depression;

20,1-vascular;

30,3-catheter;

40-bracket;

41-Stent ring;

411-pole;

42-Connecting rod;

r- the radius of curvature of the blood vessel;

L ₁ -the axial maximum length of the recess; L ₂ -the axial length of the sub-balloon; H-the depth of the recess.

Detailed ways

In order to make the purpose, advantages and features of the present invention clearer, the medical balloon, balloon catheter and medical device proposed by the present invention will be described in further detail below in conjunction with the accompanying drawings. It should be noted that the drawings all adopt imprecise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

As used in this specification and the appended claims, the singular forms "a", "an" and "the" include plural items, and the plural items "plurality" refer to two or more, unless the content clearly indicates otherwise outer. As used in this specification and the appended claims, the term "or" is generally used to include the meaning of "and/or", unless the content clearly indicates otherwise, as well as the terms "installed" and "connected" "Connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication between two elements or the interaction between two elements. For those of ordinary skill in the art, the specific meaning of the above-mentioned terms in the present invention can be understood according to specific circumstances. The same or similar reference signs in the drawings represent the same or similar components.

In this article, the terms "proximal" and "distal" refer to the relative position, relative position, and direction of elements or actions relative to each other from the perspective of the doctor using the medical balloon, although the "proximal" and "distal" The "end" is not restrictive, but the "proximal" usually refers to the end of the medical balloon that is close to the doctor during normal operation, and the "distal" usually refers to the end that first enters the blood vessel in the patient's body. In addition, all size descriptions in this article refer to the size of the medical balloon when it is in an expanded state, unless the content clearly indicates otherwise. The term "circumferential" as used herein refers to the direction surrounding the axis of the medical balloon and at right angles, acute angles or obtuse angles to the axis of the medical balloon, that is, on any plane that is not parallel to the axis of the medical balloon, unless The content is clearly stated separately.

The core idea of the present invention is to provide a medical balloon. The medical balloon includes a balloon body and a recess formed on the outer surface of the balloon body. The concave portion improves the bending performance of the medical balloon, thereby improving the bending ability of the balloon without affecting the supporting performance of the balloon to better adapt to the shape of the blood vessel, and reducing the damage of the blood vessel caused by excessive tearing of the blood vessel .

The description is given below with reference to the drawings.

Referring to Figures 3a and 3b, in one embodiment, the balloon body of the medical balloon 10 includes at least two interconnected sub-balloons 11 (five sub-balloons 11 are illustrated in the figure). The balloon 11 is preferably integrally formed, and at least one circle of recesses 12 is formed at the connection position of the two adjacent sub-balloons 11 (four circles of recesses are illustrated in the figure), and at least one circle of the recesses 12 is formed. It extends along the circumferential direction of the balloon body, that is, the extending direction of the recess 12 is at a right angle, an acute angle or an obtuse angle with the axial direction of the balloon body. In other embodiments, the concave portion 12 may also be in the form of a non-full circle of less than 360°. For example, the concave portion 12 may occupy half or three-quarters of a circumferential circle.

In the following description, it is assumed that the recess 12 is a circle to further illustrate the medical balloon of the present invention, but those skilled in the art should be able to modify the following description to apply it to the case where the recess 12 is not a circle.

Generally speaking, the medical balloon 10 is made of elastic polymer materials such as polyamide fiber (nylon), block polyetheramide elastomer (PEBAX), thermoplastic polyurethane elastomer (TPU), etc. A recess 12 is formed adjacent to the connection position of the two sub-balloons 11, so that the medical balloon 10 forms a multi-segment structure. On the one hand, the outer diameter of the medical balloon 10 at the connection point is reduced, thereby reducing the pressure of the medical balloon. The outer diameter in the grip state improves the compliance during delivery and the ability to reach the distal blood vessel; on the other hand, the stretching site of the medical balloon 10 is increased, thereby increasing the stretching range of the medical balloon 10 and improving the medical balloon The bending performance of the capsule 10 improves its bending ability.

As shown in FIG. 3 a, a circle of the recesses 12 may include at least two sub-recesses 121, and the at least two sub-recesses 121 are arranged at a circumferential interval at the junction of two adjacent sub-balloons 11. Here, the at least two sub-recesses 121 may be arranged along a circumference on a plane perpendicular to the axis of the medical balloon 10 to form a circular arrangement, or on a plane that is not perpendicular and parallel to the axis of the medical balloon 10 The circle is arranged to form an elliptical arrangement. In this way, the bending ability of the medical balloon 10 at the position where the concave portion 12 is provided is enhanced, thereby improving the bending ability of the medical balloon 10 at the position prescribed by the concave portion 12. In this embodiment, the shape and number of the recesses 12 provided on the medical balloon 10 are not limited, as long as they can achieve the purpose of improving the bending performance of the medical balloon 10.

As shown in FIG. 3b, a circle of the concave portion 12 can also be a continuous annular groove, and the continuous annular groove can be perpendicular to the axis of the medical balloon 10 (that is, the plane where the continuous annular groove is located). It is perpendicular to the axis of the medical balloon 10), or not perpendicular to the axis (that is, the plane where the continuous annular groove is located is not perpendicular and not parallel to the axis of the medical balloon 10). In this way, the bending performance of the medical balloon 10 in the entire circumferential direction is improved, so that the medical balloon 10 can obtain better bending performance in any direction, so that it is not necessary to set the bending direction of the blood vessel 20 during use. The delivery position of the medical balloon 10 is determined, which reduces the operational difficulty of medical staff when using the medical balloon 10.

In a preferred embodiment of the present invention, at least two circles of recesses 12 are formed on the outer surface of the balloon body, so that the medical balloon 10 is axially divided into more of the sub-balloons 11 (ie, segments). ), so that the medical balloon 10 has better bending performance in multiple regions, and can simultaneously comply with the bending of adjacent blood vessel segments in different directions or different arcs.

Please continue to refer to FIG. 4 and in conjunction with FIG. 3b, the proximal end of the medical balloon 10 is connected to a catheter 30, and is sent into the blood vessel 20 through the catheter 30 and then expanded. The blood vessel 20 is stretched and its radius of curvature r is Increase to γ. Because the medical balloon 10 has better bending performance and its adaptability to the shape of the blood vessel 20 is improved, the radius of curvature γ of the blood vessel 20 at this time is smaller than the radius of curvature of the blood vessel 20 when a cylindrical medical balloon is used. Value β, thereby reducing the possibility of the blood vessel 20 being torn or spasm being excessively torn. At the same time, the force generated when the medical balloon 10 is bent is transmitted to the connection point between the medical balloon 10 and the catheter 30. Because the medical balloon 10 has good adaptability to the blood vessel 20, the vicinity of the connection point is reduced. The stress is concentrated, thereby avoiding the connection point of the medical balloon 10 and the catheter 30 from being discounted.

As shown in Figure 3b, the size of the recessed portion 12 is selected according to actual conditions. For example, the maximum dimension L _{1 of} each circle of recessed portion 12 along the axial direction of the medical balloon 10 (the maximum axial length L of the recessed portion 12 ₁ ) Generally, it is not greater than 3 mm. The minimum value of the dimension H (the depth H of the recess 12) of the recess 12 in the radial direction of the medical balloon 10 can be 0.1 mm, and the maximum value can be no more than half of the radial dimension of the medical balloon 10. The axial dimension L _{2 of} the sub-balloon 11 (the axial length of the working section of the sub-balloon, that is, the axial length of the straight section of the sub-balloon) is based on the size of the medical balloon 10 and the size of the sub-balloon 11 It depends on the number.

Further, the form of the recessed portion 12 can have multiple choices. For example, as shown in FIGS. 5a to 5e, the recessed portion 12 can be a single V-shaped viewed from the axial section of the medical balloon 10 , Trapezoid, square or arc, etc., and each circle of recesses 12 can be a single shape or a combination of multiple shapes. For example, the recesses 12 shown in Figure 5d can be considered as a combination of half trapezoid and half square. The recessed portion 12, here, can also be regarded as a right-angled trapezoidal recessed portion 12. When the medical balloon 10 includes at least two circles of depressions 12, the at least two circles of depressions 12 may adopt the same or different forms. For example, the three circles of depressions 12 shown in FIG. 5e adopt three forms, respectively.

For the concave portion 12 of the same shape, when the axial maximum length L ₁ of the concave portion 12 is a certain value, the greater the depth H of the concave portion 12, the larger the internal space of the concave portion 12 will be when the medical balloon 10 is expanded , Which is more conducive to the stretching and bending of the medical balloon 10. When the depth H of the recess 12 is a certain value, the shape of the recess 12 on the axial section of the medical balloon 10 is preferably a trapezoid or a square. 6 is a schematic diagram of the bending of the medical balloon 10 when the shape of the recess 12 is V-shaped. When the medical balloon 10 is bent in the direction indicated by the arrow, the medical balloon 10 is pulled at the ridgeline of the V-shape. 7 is a schematic diagram of the bending of the medical balloon 10 when the shape of the recess 12 is a trapezoid. When the medical balloon 10 is bent in the direction shown by the arrow, the medical balloon 10 is in the two trapezoids. Stretching at the shoulder line, therefore, compared with the V-shaped recessed portion, the trapezoidal recessed portion 12 has double the stretching point, and the trapezoidal recessed portion 12 has a larger surface area and space than the V-shaped recessed portion. The recessed portion 12 is larger, which is also more favorable for the medical balloon 10 to squeeze into the recessed portion 12. Similarly, when the shape of the recess 12 is square, the effect is equivalent to that of the trapezoidal recess 12. Therefore, when the depth of the concave portion 12 is the same, the trapezoidal or square concave portion 12 has a better effect on improving the bending performance of the medical balloon 10.

Therefore, in practice, the recess 12 can be processed into a square or trapezoid shape, and the depth H of the recess 12 should be as large as possible. In addition, from the perspective of processing the medical balloon 10, the square or trapezoidal recess 12 is also easier to process. The medical balloon 10 in the embodiment of the present invention is blow-molded by a medical balloon mold with grooves, and the specific method is a well-known technology in the art, so it will not be repeated here.

Further, the balloon body of the medical balloon 10 has opposite proximal and distal ends. From the proximal end to the distal end, after the medical balloon 10 is expanded, the radial direction of the balloon body The size can be completely the same, for example, when the medical balloon 10 is used to expand the stent; after the medical balloon 10 is expanded, the radial size of the balloon body can also be different, for example, to match For blood vessels whose diameters gradually decrease from the proximal end to the distal end, after the medical balloon 10 is expanded, the outer diameter of the balloon body is correspondingly tapered from the proximal end to the distal end.

Please refer to Figs. 8a and 8b. In another embodiment, the recessed portion 12 spirally surrounds along the axis of the balloon body to form a spiral structure. As shown in FIG. 8a, the recessed portion 12 in this embodiment may be a continuous spiral groove; or, as shown in FIG. 8b, the recessed portion 12 may include multiple sub-recesses 121, such as two sub-recesses. The two sub-recesses 121 have the same rotation direction and are arranged at intervals along the axial direction of the balloon body; or, the recessed portion 12 may include at least two sub-recesses 121, for example, two sub-recesses 121. The rotation directions of the two sub-recesses 121 are opposite and they communicate with each other. If the number of the sub-recesses 121 is more than three, the rotation directions of the two adjacent sub-recesses 121 are opposite; of course, The sub-recesses 121 with opposite rotation directions may also be distributed at intervals along the axial direction of the balloon body.

In addition, there is no strict limitation on the pitch of the spiral recess 12 in this embodiment. Along the axial direction of the balloon body, the pitch of the recess 12 may be the same value, or may be set in different sections. value.

In addition, in this embodiment, viewed from the axial section of the medical balloon 10, the recessed portion 12 may be a single V-shaped, trapezoidal, square, arc, etc., or a combination of various shapes.

4, the embodiment of the present invention also provides a balloon catheter including the aforementioned medical balloon 10, such as an integral exchange balloon catheter or a quick exchange balloon catheter, the balloon catheter 10 also includes a catheter 30. The catheter 30 is connected to the proximal end of the medical balloon 10.

Further, as shown in FIG. 9, an embodiment of the present invention also provides a medical device including the balloon catheter. 10 and 11 in detail, the medical device further includes a stent 40 crimped on the medical balloon 10, the stent 40 is a tube network structure and has at least two stent rings 41, at least Two stent rings 41 are arranged at intervals along the axial direction, and each stent ring 41 is formed by a plurality of poles 411 arranged in a ring around the axis of the stent 40, and at the same time, two adjacent stent rings 41 are connected by a connecting rod 42; Wherein, the wave rod 411 includes a straight rod section, and a plurality of wave rods 411 are connected to form a stent ring 41, so the stent ring 41 has poor bending performance in the axial direction. The connecting rod 42 can be n-shaped, s-shaped or w-shaped, and has good bending performance in the axial direction. The entire stent 40 is wrapped around the outside of the medical balloon 10. When the medical balloon 10 expands, the medical balloon 10 props up the stent 40 from the inside of the stent 40 to open the stent 40.

In practical applications, the positioning positions of the wave rod 411 and the connecting rod 42 relative to the medical balloon 10 are not strictly limited. Preferably, when the medical balloon 10 and the stent 40 are in an expanded state, at least a part of the rod 411 is positioned on the balloon body, so that when the medical balloon 10 is expanded The rod 411 of the stent 40 can be stretched by the balloon body and maintain its support in the radial direction to achieve the purpose of treating diseased blood vessels. According to the number of the stent rings 41 and the specific positioning method of the pole 411, the connecting rod 42 can be positioned at the recess 12 or on the balloon body.

Next, taking the arrangement of the recess 12 along the circumferential direction of the balloon body as an example, the optional positioning method of the stent 40 is introduced. It should be understood that the following position descriptions are based on the positional relationship between the medical balloon 10 and the stent 40 in an expanded state.

In one embodiment, a part of the rod 411 is positioned on the sub-balloon 11 (that is, the balloon body). In this embodiment, there are two options for the specific positioning method of the wave rod 411. Figures 10 and 11 show the first positioning method of the wave rod 411: the two ends of the wave rod 411 are respectively pressed and held on each side. The sub-balloons 11 on both sides of the recessed portion 12 are used to prevent the probe 411 from falling into the recessed portion 12 when the medical balloon 10 is expanded, thereby restricting the full opening of the stent 40. More specifically, the length of the pole 411 along the axial direction of the medical balloon 10 is generally 2-10 mm, and the length of the pole 411 is greater than the axial maximum dimension L1 of the recess 12 after the expansion of the medical balloon 10 The length is at least 1 mm. Thus, when the lengths of the two ends of the wave rod 411 pressed on the two sub-balloons 11 are equal or approximately equal, the length of each end is not less than 0.5 mm. FIG. 12 shows a second positioning method of the pole 411: one end of the pole 411 is pressed and held on the sub-balloon 11, the other end is suspended on the recess 12, and the pole 411 is positioned at The length of the sub-balloon 11 is at least half the length of the wave rod 411, and the connecting rod 42 can be positioned at the recess 12 at this time. When the medical balloon 10 expands at the bend of the blood vessel 20, the concave portion 12 stretches and bends accordingly. At the same time, the overall bending of the medical balloon 10 transmits the bending force to the connecting rod 42 and drives the connecting rod. 42 Stretching and bending drive the bracket 40 to bend as a whole

For another example, in another embodiment, when the medical balloon 10 and the stent 40 are in an expanded state, the wave rods 411 are all positioned on the sub-balloon 11, and the connecting rod 42 is positioned on The recess 12 is as shown in Figs. 13 and 14. When the medical balloon 10 is bent, the connecting rod 42 is stretched and bent synchronously with the concave portion 12 of the medical balloon 10, and the wave rod 411 can be stably expanded by the expanded sub-balloon to fully expand the stent To achieve the purpose of supporting the blood vessel wall.

In yet another embodiment, the concave portion 12 spirally surrounds the axis of the balloon body to form a spiral structure, as shown in FIG. 8a, because the concave portion 12 of the spiral structure is always not perpendicular to the axis of the balloon body Therefore, the risk of insufficient opening of the stent 40 due to the plunger 411 or the connecting rod 42 of the stent 40 perpendicular to the axis of the balloon body falling into the recess 12 can be reduced. Furthermore, the recessed portion 12 may include a plurality of sub-recesses 121, such as two sub-recesses 121 shown in FIG. 8b. The two sub-recesses 121 have the same rotation direction and are along the axis of the balloon body. The stent 40 is arranged to be spaced apart, so that while reducing the risk of insufficient opening of the stent 40, the contact area between the stent and the balloon at the interval between the two sub-recesses 121 can also be increased, thereby further improving the success rate of opening the stent 40.

The medical device provided in this embodiment may include a medical device used for the treatment of stenosis lesions in vascular locations such as intracranial, coronary or peripheral blood vessels, may also include a medical device used for the treatment of aneurysm lesions, and may also include other tubes used for the biliary tract. Medical device for the treatment of cavitary lesions.

In summary, according to the technical solution provided by the embodiments of the present invention, the depression 12 is formed on the outer surface of the balloon body, so that the medical balloon 10 has better bending performance, thereby improving the effect of the medical balloon 10 on the blood vessel 20. The compliance of the medical balloon 10 prevents excessive tearing of the blood vessel 20 during the expansion process of the medical balloon 10 to cause blood vessel damage.

In addition, when there are multiple recesses 12 on the balloon surface, the shapes and sizes of these recesses 12 may be the same or different. Also, for the same recess 12, the axial cross-sectional shape may be the same or different. For example, when the concave portion 12 is formed by a continuous annular groove, the axial cross-sectional shape of the annular groove may be a combination of different shapes, or a single shape. For another example, when the recess 12 is formed by a plurality of sub-recesses 121 arranged at intervals, the shape of each sub-recess 121 may be the same or different.

Although the present invention is disclosed as above, it is not limited to this. Those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. In this way, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

A medical balloon, which is characterized by comprising a balloon body and a recess formed on the outer surface of the balloon body.
The medical balloon according to claim 1, wherein the recessed portion extends along the circumferential direction of the balloon body.
The medical balloon according to claim 2, wherein the recessed portion is a continuous annular groove, or the recessed portion includes at least two sub-recessed portions spaced apart along the circumference of the balloon body .
The medical balloon according to claim 2, wherein more than two recesses are formed on the outer surface of the balloon body, and each recess extends along the circumferential direction of the balloon body , Two or more of the recesses are arranged in sequence along the axial direction of the balloon body.
The medical balloon according to claim 1, wherein the recessed portion has a spiral structure and spirally surrounds along the axis of the balloon body.
The medical balloon according to claim 5, wherein the recessed portion comprises at least two sub-recesses in a spiral structure, and the at least two sub-recesses are arranged in sequence along the axial direction of the balloon body. The cloths are connected to each other, and the rotation directions of the two connected sub-recesses are opposite.
The medical balloon according to claim 5, wherein the recessed portion comprises at least two sub-recesses in a spiral structure, and at least two of the sub-recesses are spaced apart along the axial direction of the balloon body .
The medical balloon according to any one of claims 1-7, wherein in the axial cross-section of the medical balloon, the shape of the recess is arc, square, trapezoid or V-shaped. At least one of.
The medical balloon according to any one of claims 1-7, wherein when the medical balloon is in an expanded state, the outer diameter of the balloon body is tapered from the proximal end to the distal end.
A balloon catheter, which is characterized by comprising the medical balloon according to any one of claims 1-9 and a catheter connected to the proximal end of the medical balloon.
A medical device, characterized by comprising the balloon catheter according to claim 10 and a stent crimped on the medical balloon of the balloon catheter.
The medical device according to claim 11, wherein the stent has a tube network structure and includes a wave rod and a connecting rod connected to each other along the axial direction of the stent;

Wherein, when the stent and the medical balloon are in an expanded state, at least a part of the probe is positioned on the balloon body of the medical balloon.
The medical device according to claim 12, wherein when the stent and the medical balloon are in an expanded state, the connecting rod is positioned at a recess of the medical balloon.
The medical device according to claim 12, wherein the two ends of the wave rod are respectively positioned on the balloon body on both sides of the concave portion, and the waves positioned on the balloon body The length of both ends of the rod is not less than 0.5mm.
The medical device according to claim 14, wherein the lengths of the two end portions of the poles positioned on the balloon body are equal.
The medical device according to claim 12 or 13, wherein one end of the wave rod is positioned on the balloon body on one side of the recess, and the other end is positioned at the recess, and The length of the wave rod positioned on the balloon body is not less than 1/2 of the full length of the wave rod.
The medical device according to claim 12 or 13, characterized in that, all the probes are positioned on the balloon body.