Balloon catheter

Abstract

The present invention relates to the technical field of medical devices, and provides a balloon catheter, which includes a first tube body, a second tube body, a first valve and a second valve; a first cavity is provided in the first tube body, one end of the first tube body is connected to the middle of the second tube body, and the other end is used for communicating with a blood storage device; blood drainage holes are provided on the first tube body, and the blood drainage holes communicate with the first cavity; the first end of the second tube body extends into the first cavity, and a suction hole is provided at the second end of the second tube body; both the first valve and the second valve are provided in the first cavity; during the cardiac systolic phase, the first valve opens the first end of the second tube body, and the second valve closes the blood drainage holes; during the cardiac diastolic phase, the first valve closes the first end of the second tube body, and the second valve opens the blood drainage holes; the device provided by the present invention can suck blood from the left ventricle during the cardiac systolic phase, while avoiding accidentally sucking the blood in the ascending aorta out of the body, and can drain the blood into the ascending aorta during the cardiac diastolic phase, while avoiding accidentally draining the blood into the left ventricle.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a balloon catheter. Background Art

[0002] With the change of people's lifestyle, the incidence of cardiovascular diseases continues to rise; cardiogenic shock is a critical state caused by various heart diseases such as acute myocardial infarction and acute myocarditis.

[0003] The existing treatment method for cardiogenic shock is to use an interventional left ventricular assist device to draw the blood in the left ventricle to the outside of the body to reduce the heart load, thereby replacing the ventricular work and increasing the peripheral blood supply to achieve partial or complete replacement of the left ventricular ejection function; this method continuously draws blood out of the left ventricle and discharges it into the periphery during both the cardiac systolic and diastolic phases, resulting in a laminar blood flow with hemodynamic characteristics that do not conform to the physiological state, and will cause chronic damage to organs during use. Summary of the Invention

[0004] The present invention provides a balloon catheter to solve or improve the problem that the existing interventional left ventricular assist device has a laminar blood flow with hemodynamic characteristics that do not conform to the physiological state.

[0005] The present invention provides a balloon catheter, comprising: a first tube body, a second tube body, a first valve and a second valve;

[0006] A first cavity is provided in the first tube body. One end of the first tube body is connected to the middle of the second tube body, and the other end of the first tube body is used for communicating with a blood storage device; a blood discharge hole is provided on the first tube body, and the blood discharge hole is communicated with the first cavity;

[0007] The first end of the second tube body extends into the first cavity, and a suction hole is provided at the second end of the second tube body;

[0008] Both the first valve and the second valve are provided in the first cavity. The first valve is used to control the opening and closing state of the first end of the second tube body, and the second valve is used to control the opening and closing state of the blood discharge hole;

[0009] When the blood flows in the extending direction of the second tube body to the first tube body, the first valve opens the first end of the second tube body, and the second valve closes the blood discharge hole;

[0010] When the blood flows in the extending direction of the first tube body to the second tube body, the first valve closes the first end of the second tube body, and the second valve opens the blood discharge hole.

[0011] A balloon catheter provided according to the present invention, the first tube body includes: an inflation part and a transition part; the first cavity is formed within the inflation part, the first end of the inflation part is connected to the middle part of the second tube body, and the second end of the inflation part communicates with the transition part.

[0012] A balloon catheter provided according to the present invention, in the extending direction from the middle part of the inflation part to the first end or the second end of the inflation part, the diameter of the inflation part gradually decreases, and the blood drainage holes are arranged near the first end of the inflation part.

[0013] A balloon catheter provided according to the present invention, one end of the first valve is connected to the first end of the second tube body, and the first valve can swing relative to the second tube body under the action of blood to open or close the first end of the second tube body; wherein, the covering area of the first valve is larger than the orifice area of the second tube body.

[0014] A balloon catheter provided according to the present invention, the balloon catheter further includes: a framework; the framework is arranged within the first cavity, the framework is sleeved on the second tube body, a second cavity is defined between the framework and the inner wall surface of the first cavity, and the blood drainage holes communicate with the second cavity; a communication port is provided on the framework, and the second valve is connected to the framework to control the opening or closing of the communication port.

[0015] A balloon catheter provided according to the present invention, the framework includes: a first annular part and a second annular part; the first annular part is sleeved on the outer wall surface of the second tube body, the second annular part is sleeved on the outside of the second tube body and is connected to the inner wall surface of the first cavity, and the communication port is formed between the first annular part and the second annular part; one end of the second valve is connected to the first annular part; the second valve can swing relative to the second annular part under the action of blood to open or close the communication port.

[0016] A balloon catheter provided according to the present invention, the framework further includes: a plurality of connecting parts; the plurality of connecting parts are arranged along the circumferential direction of the first annular part, one end of the connecting part is connected to the first annular part, and the other end of the connecting part is connected to the second annular part to form a plurality of the communication ports between the first annular part and the second annular part; a plurality of the second valves are provided, and the plurality of the second valves are arranged in one-to-one correspondence with the plurality of the communication ports.

[0017] A balloon catheter provided according to the present invention, a plurality of the blood drainage holes are provided, and the plurality of the blood drainage holes are arranged in one-to-one correspondence with the plurality of the communication ports.

[0018] A balloon catheter provided by the present invention, the second tube body includes a first section and a second section, the second section is frustum-shaped; the first section is connected to the second section, and the suction holes are arranged on the conical surface of the second section.

[0019] A balloon catheter provided by the present invention, a plurality of suction holes are provided, and the plurality of suction holes are evenly distributed along the circumferential direction of the second section.

[0020] The balloon catheter provided by the present invention, by arranging a first valve and a second valve in the first cavity of the first tube body, the first valve and the second valve can be adaptively adjusted to corresponding positions when the blood flow direction changes, so as to intermittently transport the blood in the left ventricle to the ascending aorta along with the contraction and relaxation of the heart. At the same time, when sucking blood from the left ventricle, it is possible to avoid accidentally sucking the blood in the ascending aorta out of the body, and when discharging blood into the ascending aorta, it is possible to avoid accidentally discharging the blood into the left ventricle;

[0021] When the heart is in the systolic phase, the liquid pump in the blood storage device performs a blood drawing operation, thereby creating a negative pressure in the first cavity, so that the pressure above the first valve is less than the pressure below, that is, there is a positive pressure difference on both sides of the first valve. When the blood in the second tube body flows to the first valve, the blood lifts the first valve under the action of the positive pressure difference, thereby opening the first end of the second tube body, and the blood in the second tube body can flow into the first cavity, so as to realize that the blood in the left ventricle sequentially enters the blood storage device through the suction holes, the second tube body and the first cavity, and the blood storage device temporarily stores the blood; at the same time, the blood in the ascending aorta will enter the first cavity through the blood discharge hole under the action of the negative pressure, and the blood lifts the second valve, and then the second valve closes the blood discharge hole to avoid sucking the blood in the ascending aorta into the blood storage device; wherein, during this process, the blood flows along the extension direction of the second tube body to the first tube body.

[0022] When the heart is in the diastolic phase, the liquid pump in the blood storage device performs a blood pumping operation, thereby pumping the blood into the first cavity. At this time, the pressure above the first valve is greater than the pressure below, that is, there is a negative pressure difference on both sides of the first valve. The blood in the first cavity presses the first valve against the first end of the second tube body, thereby closing the first end of the second tube body to avoid pumping the blood into the left ventricle; when the blood in the first cavity flows to the second valve, the blood squeezes the second valve, thereby opening the blood discharge hole, and the blood in the first cavity can be discharged into the ascending aorta through the blood discharge hole, that is, the blood in the blood storage device is sequentially transported to the ascending aorta through the first cavity and the blood discharge hole; wherein, during this process, the blood flows along the extension direction of the first tube body to the second tube body.

[0023] The balloon catheter shown in the present invention controls the opening and closing state of the first end of the second tube body through the first valve and controls the opening and closing state of the blood discharge hole through the second valve when the blood flow direction changes, thereby achieving the goal of sucking the blood in the left ventricle into the blood storage device during the heart's contraction period, and pumping the blood in the blood storage device into the ascending aorta during the heart's diastole period, thereby assisting or completely replacing the heart in completing the ejection function to reduce the heart's load; at the same time, the second valve can prevent the blood in the ascending aorta from being sucked into the blood storage device, and the first valve can prevent the blood in the blood storage device from being pumped into the left ventricle, thereby improving the reliability of the balloon catheter; because the heart contracts and relaxes alternately, that is, the blood drawing and blood pumping of the balloon catheter shown in the present invention are also alternately performed, thereby making the dynamic characteristics of the blood transported by the balloon catheter more consistent with the physiological state of horizontal blood flow, reducing organ damage during treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the overall structure of the balloon catheter provided by the present invention;

[0026] Figure 2 It is a schematic diagram of the structure of the balloon catheter provided by the present invention when the heart is in the systolic period;

[0027] Figure 3 It is a schematic diagram of the structure of the balloon catheter provided by the present invention when the heart is in diastole;

[0028] Figure 4 It is a schematic diagram of the structure of the skeleton provided by the present invention.

[0029] Reference numerals:

[0030] 1: first tube body; 11: blood discharge hole; 12: expansion part; 13: adapter part; 2: second tube body; 21: suction hole; 22: first segment; 23: second segment; 3: first valve; 4: second valve; 5: skeleton; 51: first annular part; 52: second annular part; 53: connecting part. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0033] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "coupled" 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. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0034] The following Figures 1 to 4 describes a balloon catheter provided by the present invention.

[0035] As Figures 1 to 3 shown, the balloon catheter shown in this embodiment includes: a first tube body 1, a second tube body 2, a first valve 3 and a second valve 4.

[0036] A first cavity is provided in the first tube body 1. One end of the first tube body 1 is connected to the middle of the second tube body 2, and the other end of the first tube body 1 is used to communicate with a blood storage device; a blood drainage hole 11 is provided on the first tube body 1, and the blood drainage hole 11 communicates with the first cavity; the first end of the second tube body 2 extends into the first cavity, and a suction hole 21 is provided at the second end of the second tube body 2; both the first valve 3 and the second valve 4 are provided in the first cavity. The first valve 3 is used to control the opening and closing state of the first end of the second tube body 2, and the second valve 4 is used to control the opening and closing state of the blood drainage hole 11; in the actual application process, the second end of the second tube body 2 is extended into the left ventricle, and the blood drainage hole 11 is placed in the ascending aorta so that the blood in the left ventricle can enter the second tube body 2 through the suction hole 21;

[0037] When blood flows in the extending direction from the second tube body 2 to the first tube body 1, the first valve 3 opens the first end of the second tube body 2, and the second valve 4 closes the blood drainage hole 11;

[0038] When blood flows in the extending direction from the first tube body 1 to the second tube body 2, the first valve 3 closes the first end of the second tube body 2, and the second valve 4 opens the blood drainage hole 11.

[0039] Specifically, for the balloon catheter shown in this embodiment, by arranging the first valve 3 and the second valve 4 in the first cavity of the first tube body 1, the first valve 3 and the second valve 4 can adaptively adjust to the corresponding positions when the blood flow direction changes, so as to intermittently transport the blood in the left ventricle into the ascending aorta along with the contraction and relaxation of the heart. At the same time, when sucking blood from the left ventricle, it can avoid accidentally sucking the blood in the ascending aorta out of the body, and when discharging blood into the ascending aorta, it can avoid accidentally discharging the blood into the left ventricle;

[0040] See Figure 2 , when the heart is in the systolic phase, the liquid pump in the blood storage device performs a blood extraction operation, thereby forming a negative pressure in the first cavity, so that the pressure above the first valve 3 is less than the pressure below it, that is, there is a positive pressure difference on both sides of the first valve 3. When the blood in the second tube body 2 flows to the first valve 3, the blood lifts the first valve 3 under the action of the positive pressure difference, thereby opening the first end of the second tube body 2, and the blood in the second tube body 2 can flow into the first cavity, so as to realize that the blood in the left ventricle sequentially enters the blood storage device through the suction hole 21, the second tube body 2 and the first cavity, and the blood storage device temporarily stores the blood; at the same time, the blood in the ascending aorta will enter the first cavity through the blood drainage hole 11 under the action of the negative pressure, and the blood lifts the second valve 4, and then the second valve 4 closes the blood drainage hole 11 to avoid sucking the blood in the ascending aorta into the blood storage device; wherein, during this process, the blood flows in the extending direction from the second tube body 2 to the first tube body 1, Figure 2 The arrow in

[0041] See Figure 3When the heart is in diastole, the liquid pump in the blood storage device performs a blood pumping operation, thereby pumping blood into the first chamber. At this time, the pressure on the upper side of the first valve 3 is greater than the pressure on the lower side, that is, there is a negative pressure difference on both sides of the first valve 3, and the blood in the first chamber presses the first valve 3 against the first end of the second tube body 2, thereby closing the first end of the second tube body 2 to avoid pumping blood into the left ventricle; when the blood in the first chamber flows to the second valve 4, the blood squeezes the second valve 4, thereby opening the blood discharge hole 11, and the blood in the first chamber can be discharged into the ascending aorta through the blood discharge hole 11, that is, the blood in the blood storage device is sequentially transported to the ascending aorta through the first chamber and the blood discharge hole 11; wherein, in this process, the blood flows along the extension direction from the first tube body 1 to the second tube body 2, Figure 3 Arrows are used to indicate the direction of blood flow.

[0042] The balloon catheter shown in this embodiment controls the opening and closing state of the first end of the second tube body 2 by the first valve 3, and controls the opening and closing state of the blood discharge hole 11 by the second valve 4 when the blood flow direction changes, so as to achieve the goal of sucking the blood in the left ventricle into the blood storage device during the heart's contraction period, and pumping the blood in the blood storage device into the ascending aorta during the heart's diastole period, thereby assisting or completely replacing the heart in completing the ejection function to reduce the heart's load; at the same time, the second valve 4 can prevent the blood in the ascending aorta from being sucked into the blood storage device, and the first valve 3 can prevent the blood in the blood storage device from being pumped into the left ventricle, thereby improving the reliability of the balloon catheter; because the heart contracts and relaxes alternately, that is, the blood drawing and blood pumping of the balloon catheter shown in this embodiment are also alternately performed, thereby making the dynamic characteristics of the blood transported by the balloon catheter more consistent with the physiological horizontal blood flow, reducing organ damage during treatment.

[0043] In some embodiments, Figures 1 to 3 As shown, the first tube body 1 shown in this embodiment includes: an expansion part 12 and a transition part 13; the first cavity is formed in the expansion part 12, the first end of the expansion part 12 is connected to the middle part of the second tube body 2, and the second end of the expansion part 12 is connected to the transition part 13.

[0044] Specifically, the expansion part 12 is connected to the blood storage device through the adapter 13; the expansion part 12 is an elastic body, and during the installation of the balloon catheter, an inward force is applied to the expansion part 12, and the volume of the expansion part 12 decreases. After the installation is completed, the force is cancelled, and the volume of the expansion part 12 increases, that is, the expansion part 12 expands.

[0045] In some embodiments, Figures 1 to 3As shown, in the extending direction from the middle part of the expansion part 12 to the first end or the second end of the expansion part 12, the diameter of the expansion part 12 gradually decreases, and the blood drainage hole 11 is arranged near the first end of the expansion part 12.

[0046] Specifically, the expansion part 12 has a spindle-shaped structure that is thick in the middle and thin at both ends. The diameters of both ends of the expansion part 12 are larger than the diameter of the second tube body 2 and the diameter of the adapter part 13. That is, the first cavity in the expansion part 12 can store a certain amount of blood. Then, when blood extraction and blood pumping are carried out alternately, the blood flow rate transported through the first cavity is relatively large, avoiding the problem that it is difficult to meet the clinical treatment requirements due to limited blood flow when the pipe diameter is small.

[0047] In some embodiments, as Figure 2 and Figure 3 shown, one end of the first valve 3 shown in this embodiment is connected to the first end of the second tube body 2. The first valve 3 can swing relative to the second tube body 2 under the action of blood. It can be understood that the swinging direction of the first valve 3 is the same as the blood flow direction, so as to open or close the first end of the second tube body 2; wherein, the covering area of the first valve 3 is larger than the orifice area of the second tube body 2.

[0048] Specifically, when performing blood extraction operation, the blood pushes the first valve 3 to swing upward, thereby opening the first end of the second tube body 2, and the blood in the second tube body 2 can flow into the first cavity; when performing blood pumping operation, the blood pushes the first valve 3 to swing downward, thereby closing the first end of the second tube body 2 to avoid pumping blood into the left ventricle; by setting the covering area of the first valve 3 to be larger than the orifice area of the second tube body 2, the closing effect of the first valve 3 can be ensured, and the orifice of the second tube body 2 can play a good supporting and limiting role for the first valve 3, avoiding excessive swinging of the first valve 3 into the second tube body 2.

[0049] In some embodiments, as Figures 2 to 4 shown, the balloon catheter shown in this embodiment further includes: a framework 5; the framework 5 is arranged in the first cavity, the framework 5 is sleeved on the second tube body 2, a second cavity is defined between the framework 5 and the inner wall surface of the first cavity, and the blood drainage hole 11 is communicated with the second cavity; a communication port is arranged on the framework 5, and the second valve 4 is connected to the framework 5 to control the opening or closing of the communication port.

[0050] Specifically, one side of the framework 5 facing the blood drainage hole 11, the inner wall surface of the first cavity, and the outer wall surface of the second tube body 2 enclose a second cavity. During blood extraction operation, a small amount of blood in the ascending aorta will enter the second cavity through the blood drainage hole 11 and push the second valve 4 to swing upward, so that the second valve 4 closes the communication port, and the blood in the second cavity cannot flow into the first cavity, which is equivalent to the second valve 4 closing the blood drainage hole 11 to prevent the blood in the ascending aorta from being aspirated into the blood storage device; during blood pumping operation, the blood in the first cavity pushes the second valve 4 to swing downward, so that the second valve 4 opens the communication port, and the blood in the first cavity can flow into the second cavity through the communication port and then be input into the ascending aorta through the blood drainage hole 11, which is equivalent to the second valve 4 opening the blood drainage hole 11.

[0051] In some embodiments, as Figures 2 to 4 shown, the framework 5 shown in this embodiment includes: a first annular portion 51 and a second annular portion 52; the first annular portion 51 is sleeved on the outer wall surface of the second tube body 2, the second annular portion 52 is sleeved outside the second tube body 2 and connected to the inner wall surface of the first cavity, and the communication port is formed between the first annular portion 51 and the second annular portion 52; the diameter of the first annular portion 51 is smaller than that of the second annular portion 52, and one end of the second valve 4 is connected to the first annular portion 51; the second valve 4 can swing relative to the second annular portion 52 under the action of blood to open or close the communication port.

[0052] Specifically, since the diameter of the first annular portion 51 is smaller than that of the second annular portion 52, the second valve 4 is integrally bowl-shaped. When the second valve 4 swings towards the second annular portion 52, the second valve 4 is in an unfolded state, and when the second valve 4 swings away from the second annular portion 52, the second valve 4 is in a gathered state; when the second valve 4 swings to the second annular portion 52, the second valve 4 is equivalent to lapping on the second annular portion 52, so that the second valve 4 forms a closed surface as a whole to enclose the area between the first annular portion 51 and the second annular portion 52.

[0053] In some embodiments, as Figure 4 shown, the framework 5 shown in this embodiment includes: a plurality of connecting portions 53; the plurality of connecting portions 53 are arranged along the circumferential direction of the first annular portion 51, one end of the connecting portion 53 is connected to the first annular portion 51, and the other end of the connecting portion 53 is connected to the second annular portion 52, that is, the connecting portion 53 divides the area between the first annular portion 51 and the second annular portion 52 into a plurality of parts to form a plurality of communication ports between the first annular portion 51 and the second annular portion 52; there are a plurality of second valves 4, and the plurality of second valves 4 are arranged in one-to-one correspondence with the plurality of communication ports.

[0054] Specifically, by providing the connecting portion 53, the overall stability of the framework 5 is ensured. When the second valve 4 swings to the second annular portion 52, the second valve 4 can also adaptively fit with two adjacent connecting portions 53, so that the second valve 4 is supported by the connecting portions 53, preventing the second valve 4 from swinging excessively and ensuring the blocking effect of the second valve 4 on the communication port. By providing a plurality of second valves 4, when the blood pushes the second valves 4 to swing, the blood flow is relatively uniform and stable.

[0055] In some embodiments, as Figure 2 and Figure 3 shown, the present embodiment shows that there are a plurality of blood discharge holes 11, and the plurality of blood discharge holes 11 are arranged in one-to-one correspondence with the plurality of communication ports.

[0056] Specifically, by arranging the blood discharge holes 11 in one-to-one correspondence with the communication ports, when performing blood extraction operations, the blood entering through the blood discharge holes 11 can directly act on the second valve 4 at the corresponding communication port, thereby improving the closing efficiency of the second valve 4 on the communication port and preventing the blood in the ascending aorta from being aspirated into the blood storage device. When performing blood pumping operations, the blood in the first cavity can smoothly discharge into the ascending aorta through the corresponding blood discharge holes 11 after pushing open the second valve 4, improving the blood pumping efficiency. Since the communication ports are arranged circumferentially, correspondingly, the blood discharge holes 11 are also arranged circumferentially. During the blood pumping process, the blood is discharged from a plurality of blood discharge holes 11 respectively. Compared with a single blood discharge hole 11, the blood flow is relatively uniform and stable through the plurality of blood discharge holes 11, and at the same time, the blood discharge volume is ensured.

[0057] In some embodiments, as Figures 1 to 3 shown, the second tube body 2 of the present embodiment includes a first section 22 and a second section 23. The second section 23 is in a frustum shape, and the first section 22 is in a cylindrical shape. The first section 22 is connected to the second section 23, and the suction holes 21 are provided on the conical surface of the second section 23. The first section 22 is used to extend into the first cavity.

[0058] Specifically, by setting the second section 23 in a frustum shape and opening the suction holes 21 on the conical surface of the second section 23, the flow direction of the blood in the suction holes 21 forms an acute angle with the flow direction of the blood in the first section 22. Compared with opening the suction holes 21 on a straight tube, where the flow direction of the blood in the suction holes 21 forms a right angle with the flow direction of the blood in the straight tube, the frustum-shaped second section 23 of the present embodiment can smoothly introduce the blood in the left ventricle into the first section 22, reducing the resistance of the blood flow.

[0059] In some embodiments, as Figures 1 to 3 shown, the present embodiment shows that there are a plurality of suction holes 21, and the plurality of suction holes 21 are evenly distributed along the circumferential direction of the second section 23.

[0060] Specifically, by circumferentially arranging a plurality of suction holes 21 in a uniform manner, the uniformity of blood suction in all directions is ensured while meeting the blood suction volume.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A balloon catheter, characterized in that, include: A first tube body, a second tube body, a first valve and a second valve; A first cavity is provided in the first tube body, one end of the first tube body is connected to the middle of the second tube body, and the other end of the first tube body is used to communicate with the blood storage device; a blood discharge hole is provided on the first tube body, and the blood discharge hole is communicated with the first cavity; The first end of the second tube extends into the first cavity, and the second end of the second tube is provided with a suction hole; The first valve and the second valve are both disposed in the first cavity, the first valve is used to control the opening and closing state of the first end of the second tube body, and the second valve is used to control the opening and closing state of the blood discharge hole; When blood flows along the extending direction from the second tube body to the first tube body, the first valve opens the first end of the second tube body, and the second valve closes the blood discharge hole; When blood flows along the extending direction from the first tube body to the second tube body, the first valve closes the first end of the second tube body, and the second valve opens the blood discharge hole; The balloon catheter further comprises: a skeleton; The frame is disposed in the first cavity, the frame is sleeved on the second tube, a second cavity is defined between the frame and the inner wall surface of the first cavity, and the blood discharge hole is connected to the second cavity; The frame is provided with a communication port, and the second valve is connected to the frame to control the opening or closing of the communication port; The skeleton comprises: a first annular portion and a second annular portion; The first annular portion is sleeved on the outer wall surface of the second tube body, the second annular portion is sleeved on the outer side of the second tube body and connected to the inner wall surface of the first cavity, the communication port is formed between the first annular portion and the second annular portion, and the diameter of the first annular portion is smaller than the diameter of the second annular portion; One end of the second valve is connected to the first annular portion; the second valve can swing relative to the second annular portion under the action of blood to open or close the communication port.

2. The balloon catheter according to claim 1, characterized in that: The first tube body comprises: an expansion portion and a transition portion; The first cavity is formed in the expansion portion, a first end of the expansion portion is connected to the middle portion of the second tube body, and a second end of the expansion portion is communicated with the transition portion.

3. The balloon catheter according to claim 2, characterized in that: In the extending direction from the middle of the expansion part to the first end or the second end of the expansion part, the diameter of the expansion part gradually decreases, and the blood discharge hole is arranged near the first end of the expansion part.

4. The balloon catheter according to claim 1, characterized in that: One end of the first valve is connected to the first end of the second tube body, and the first valve can swing relative to the second tube body under the action of blood to open or close the first end of the second tube body; Wherein, the covering area of the first valve is larger than the tube opening area of the second tube body.

5. The balloon catheter according to claim 1, characterized in that: The skeleton further comprises: a plurality of connecting parts; A plurality of connecting portions are arranged circumferentially along the first annular portion. One end of the connecting portion is connected to the first annular portion, and the other end of the connecting portion is connected to the second annular portion, so as to form a plurality of the communication ports between the first annular portion and the second annular portion; A plurality of the second valves are provided, and the plurality of the second valves are arranged in one-to-one correspondence with the plurality of the communication ports.

6. The balloon catheter according to claim 5, wherein A plurality of blood drainage holes are provided, and the plurality of blood drainage holes are arranged in one-to-one correspondence with the plurality of the communication ports.

7. The balloon catheter according to claim 1, wherein The second tube body includes a first section and a second section, and the second section is frustum-shaped; The first section is connected to the second section, and the suction holes are provided on the conical surface of the second section.

8. The balloon catheter according to claim 7, wherein A plurality of the suction holes are provided, and the plurality of the suction holes are evenly distributed circumferentially along the second section.

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