A renal artery balloon catheter device for local cold perfusion

Abstract

The application discloses a renal artery balloon catheter device for local cold perfusion, and relates to the field of renal artery balloon catheter devices, which comprises a catheter main body, and an installation ring pipe is fixedly connected to the outer surface of the catheter main body. The renal artery balloon catheter device for local cold perfusion has two fixed liquid sacs, can stably fix the catheter main body to the inner wall of an artery, effectively prevents the catheter from sliding and deviating during the flushing process, and ensures the accuracy of the cold perfusion position. Meanwhile, the sealed liquid sac is tightly combined with the inner wall of the artery after being inflated, forms reliable sealing, and prevents the backflow of low-temperature liquid. The internal through holes of the installation ring pipe are annularly and uniformly distributed, cold liquid is uniformly introduced into the liquid sac, the uniformity of expansion is ensured, and the fixing and sealing effects are further improved. During the flushing, the pressure reducing valve mechanism keeps the fixed liquid sac and the sealed liquid sac inflated at all times, the low-temperature liquid is uniformly discharged through multiple liquid outlet holes, the pressure is reduced, the arterial wall is prevented from being damaged, and stable and efficient cold perfusion of the kidney is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to a renal artery balloon catheter technology, in particular to a renal artery balloon catheter device for local cold perfusion. BACKGROUND

[0002] For open, closed injury or space-occupying lesions of the kidney, partial nephrectomy or extended resection of urinary organs and other complex renal surgery are often required. Before such surgery, a renal artery balloon catheter is implanted, and a low-temperature liquid is perfused through the balloon catheter during the surgery. Laparoscopic or robotic partial nephrectomy assisted by low-temperature perfusion can effectively reduce intraoperative and postoperative complications, prolong renal ischemia time, and protect renal function.

[0003] A renal low-temperature perfusion balloon catheter is disclosed in Chinese Patent No. 202110754590.7, which includes a main body, a balloon, and a needle. The distal end of the main body is provided with a balloon. The main body includes a liquid infusion head, a connecting block, a liquid guide tube, and a waterproof device. The waterproof device includes a water collection frame, a water absorption device, a sealing device, and a water guide piece. The water collection frame is conical. The water absorption device is installed at the inner bottom end of the water collection frame. The sealing device includes a rubber ring, a deformation groove, a contact layer, a hole groove, and a support strip. The contact layer includes a buffer block, a perforation, and a buffer groove. The buffer block includes a buffer body, a cutting groove, and a small protrusion. The present application installs a waterproof device in the liquid guide tube. The waterproof device collects water droplets on the end surface of the liquid guide tube. The support strip supports the end surface of the rubber ring, so that the rubber ring can tightly contact the outer end surface of the liquid guide tube. This prevents water droplets on the outer end surface of the liquid guide tube from flowing into the patient's body, thereby avoiding infection of the patient's wound. However, the patent still has the following shortcomings. The patent lacks an effective fixing mechanism for the catheter, making it difficult to stably fix the catheter to the inner wall of the artery. During the flushing process, the catheter is prone to sliding and shifting, resulting in inaccurate cold perfusion position and inability to accurately perform low-temperature perfusion on specific parts of the kidney, affecting the surgical effect. In addition, the sealing effect is not good, making it difficult to prevent the backflow of low-temperature liquid. When the perfusion is stopped, the liquid flows out of the needle through the balloon, making it difficult for the balloon to seal and fix the artery, resulting in backflow of low-temperature liquid. SUMMARY

[0004] The present application provides a renal artery balloon catheter device for local cold perfusion, which aims to solve the problem of lack of effective fixing mechanism for the catheter in the prior art, making it difficult to stably fix the catheter to the inner wall of the artery. During the flushing process, the catheter is prone to sliding and shifting, resulting in inaccurate cold perfusion position and inability to accurately perform low-temperature perfusion on specific parts of the kidney.

[0005] In order to achieve the above object, the present application provides the following technical scheme: a renal artery balloon catheter device for local cold perfusion, comprising a catheter main body, an installation ring pipe fixedly sleeved on the outer surface of the catheter main body near the liquid outlet end, two baffle plates fixedly connected in the catheter main body and having a sealing function, the installation ring pipe being arranged on the pipe segment between the two baffle plates of the catheter main body and extending outward at both ends, a liquid inlet cavity being formed between the outer surface of the catheter main body and the inner surface of the installation ring pipe, a plurality of through grooves being formed in the inner wall of the pipe segment of the catheter main body outside the two baffle plates and being connected with the liquid inlet cavity, a plurality of fixed liquid sacs and a plurality of sealing liquid sacs being fixedly connected to the outer surface of the installation ring pipe, a plurality of through holes being formed in the pipe wall of the installation ring pipe and connecting the liquid inlet cavity with the fixed liquid sacs and the sealing liquid sacs, respectively, an injection pipe being threadedly connected to the liquid outlet end of the catheter main body, a plurality of liquid outlet holes being formed in the outer surface of the injection pipe, and a pressure reducing valve mechanism being fixedly connected in the injection pipe and used for preventing liquid backflow.

[0006] On the basis of the above technical scheme, the present application can be further improved as follows.

[0007] Further, the pressure reducing valve mechanism comprises an installation frame fixedly connected with the injection pipe, one side of the installation frame being fixedly connected with one end of a spring, the other end of the spring being fixedly connected with a sealing block, a sealing ring being fixedly connected in the injection pipe, when the sealing block is impacted by the liquid injected by the catheter main body, the spring is elongated, the sealing block moves in the liquid outlet direction and away from the sealing ring, and the liquid enters the injection pipe through the gap between the sealing block and the sealing ring.

[0008] Further, one side of the sealing block facing the sealing ring is fixedly connected with a rubber sealing gasket.

[0009] Further, the outer surface of the sealing block is fixedly connected with a guide limiting ring in sliding connection with the injection pipe through a connecting block.

[0010] Further, the outer surface of the fixed liquid sac is fixedly provided with a plurality of friction liquid sacs connected with the fixed liquid sac.

[0011] Further, a connecting pipe is threadedly connected to the liquid inlet end of the catheter main body, and an on-off valve is arranged on the connecting pipe.

[0012] Further, the liquid inlet end of the connecting pipe is connected with a liquid injection machine.

[0013] Further, one end of the connecting pipe is connected with an air suction machine or a liquid suction pump.

[0014] Further, the fixed liquid bag has two and is arranged at two ends of the mounting ring pipe, and the sealing liquid bag has two and is arranged at the middle pipe section of the mounting ring pipe.

[0015] Further, the catheter body is provided with a pressure alarm for monitoring the pressure value inside the catheter body at the liquid inlet end.

[0016] Compared with the prior art, the renal artery balloon catheter device for local cold perfusion has the following beneficial effects:

[0017] Precise fixation and efficient sealing are achieved through unique design. The fixed liquid bag surface is distributed with multiple hemispherical or conical friction liquid bags, which greatly increases the contact area with the inner wall of the artery. In combination with the two fixed liquid bags, the catheter body can be stably fixed to the inner wall of the artery, effectively preventing the catheter from sliding and deviating during flushing, and ensuring the accuracy of the cold perfusion position. At the same time, the sealing liquid bag is tightly attached to the inner wall of the artery after being inflated, forming a reliable seal to prevent backflow of the low-temperature liquid. The internal through-hole of the mounting ring pipe is evenly distributed in a ring shape, allowing the cold liquid to enter the liquid bag uniformly and ensuring uniform expansion, further improving the fixation and sealing effect. During flushing, the pressure reducing valve mechanism keeps the fixed liquid bag and the sealing liquid bag inflated at all times, and the low-temperature liquid flows out uniformly through multiple liquid outlets, reducing the pressure and avoiding damage to the arterial wall, achieving stable and efficient cold perfusion of the kidney.

[0018] Considering the differences in the diameters of the renal arteries of patients, the catheter body is designed in multiple sizes and specifications, with diameters covering 2mm, 3mm, 4mm, etc., and reasonable lengths, which can accurately reach the appropriate position of the renal artery and meet the clinical needs of different patients. The operation process is clear and simple. First, sterilize each component strictly, then implant the catheter into the renal artery under the guidance of ultrasound, and start flushing by injecting cold liquid through the liquid injection machine. After flushing, close the on-off valve and the liquid injection machine, and the sealing block is sealed under the action of the spring to prevent backflow of the liquid. The fixed liquid bag and the sealing liquid bag remain inflated, preventing the liquid in the kidney from flowing back. When the operation is completed and the catheter is removed, open the valve to release the liquid, connect the suction machine to extract the gas in the liquid bag, and reduce the volume for easy removal. In addition, the injection tube can be disassembled and reused after sterilization, reducing the use cost.

[0019] The device is made of high-quality materials, the fixing liquid bag and the sealing liquid bag are made of high-strength and low-temperature-resistant elastic materials, such as polyvinyl butyral (PVB) or polyethylene terephthalate (PET), which can maintain good elasticity and sealing performance in low-temperature environment, and ensure the stable expansion and shape of the liquid bag. The catheter body is made of high-molecular materials with good biocompatibility and flexibility, such as polyurethane or silicone rubber, which can reduce the stimulation to the inner wall of the blood vessel, reduce the risk of thrombosis, and the surface can be treated with hydrophilic coating to improve the smoothness, make the implantation more smooth, and reduce the damage to the blood vessel. In the pressure reducing valve mechanism, the spring, sealing block and sealing ring cooperate to realize the liquid anti-backflow function. Scientific design and high-quality materials provide safe and reliable cold perfusion treatment guarantee for patients. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0021] Figure 1 It is the first perspective view of the external structure of the present application.

[0022] Figure 2 It is the second perspective view of the external structure of the present application.

[0023] Figure 3 It is the first perspective view of the internal structure of the present application.

[0024] Figure 4 It is the second perspective view of the internal structure of the present application.

[0025] Figure 5 It is the partial perspective view of the internal structure of the present application.

[0026] Figure 6 It is the enlarged view of A in the present application. Figure 3

[0027] Figure 7 It is the enlarged view of B in the present application. Figure 4

[0028] Figure 8 It is the enlarged view of C in the present application. Figure 5

[0029] Explanation of reference signs:

[0030] ​​​1, catheter body; 2, mounting ring pipe; 3, partition; 4, through groove; 5, fixed liquid bag; 6, sealing liquid bag; 7, through hole; 8, injection tube; 9, liquid outlet hole; 11, mounting frame; 12, spring; 13, sealing block; 14, sealing ring; 15, rubber sealing pad; 16, limiting ring; 21, friction liquid bag; 31, connecting pipe; 32, on-off valve. DETAILED DESCRIPTION

[0031] The technical solutions of the present application will be described clearly and completely below in combination with the drawings and specific embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] In the description of the present application, if terms indicating orientation or position relationship such as "up", "down", "left", "right", "top", "bottom", "inner", "outer" are used, the indicated orientation or position relationship is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0033] Embodiment one

[0034] Please refer to Figures 1 to 8 As shown in the drawings, the present application provides a kind of renal artery balloon catheter device for local cold perfusion, including catheter body 1, the outer surface of catheter body 1 is fixedly connected with mounting ring pipe 2, two partition 3 of sealing effect are fixedly connected in the catheter body 1, the mounting ring pipe 2 is located in the pipe section of the catheter body 1 between the two partition 3 and two ends respectively extend outward (i.e. the two ends of mounting ring pipe extend to the position outside the partition 3, so as to enter and exit liquid to liquid cavity), the outer surface of the catheter body 1 and the inner surface of the mounting ring pipe 2 form liquid cavity, the inner wall of the pipe section of the catheter body outside the two partition is respectively provided with a plurality of through grooves 4 connected with the liquid cavity, the outer surface of the mounting ring pipe 2 is fixedly connected with two fixed liquid bags 5 at both ends, the outer surface of the mounting ring pipe 2 is fixedly connected with two sealing liquid bags 6 in the middle, the inner surface of the mounting ring pipe 2 is provided with a plurality of through holes 7 corresponding to the fixed liquid bag 5 and the sealing liquid bag 6, and the fixed liquid bag 5 and the sealing liquid bag 6 are selected from high-strength, low-temperature-resistant elastic materials, such as polyvinyl butyral (PVB) or polyethylene terephthalate (PET). This material can still maintain good elasticity and sealing property in low temperature environment, to ensure that the liquid bag can be stably expanded and maintain shape after being filled with low temperature liquid.

[0035] The catheter body 1 is made of a polymer material with good biocompatibility and flexibility, such as polyurethane or silicone rubber. This material not only reduces the irritation to the inner wall of the patient's blood vessel and reduces the risk of thrombosis, but also ensures the smooth implantation and operation of the catheter in the renal artery. At the same time, the surface of the catheter body 1 can be treated with a hydrophilic coating to further improve its surface smoothness, making the implantation process smoother and reducing damage to the blood vessel.

[0036] Size diversification: Considering the differences in the diameters of the renal arteries of different patients, the catheter body 1 is designed in multiple sizes, such as 2mm, 3mm, 4mm, etc., to meet the clinical needs of different patients. The length of each size of the catheter body 1 is also reasonably designed to ensure accurate access to the appropriate position of the renal artery;

[0037] The through hole 7 inside the mounting ring tube 2 is arranged in an annular and uniform distribution manner, which allows the cold liquid to enter the fixing liquid bag 5 and the sealing liquid bag 6 more uniformly, ensuring the uniformity of the expansion of the liquid bag and improving the fixing and sealing effect;

[0038] The catheter body 1 is threadedly connected to an injection tube 8 at one end, and the outer surface of the injection tube 8 is provided with a plurality of liquid outlet holes 9. A pressure relief valve mechanism is fixedly connected inside the injection tube 8 to prevent backflow of the liquid. The pressure relief valve mechanism includes a mounting bracket 11 fixedly connected to the injection tube 8, a spring 12 fixedly connected to one side of the mounting bracket 11, a sealing block 13 fixedly connected to one end of the spring 12, a sealing ring 14 fixedly connected inside the injection tube 8, a rubber sealing gasket 15 fixedly connected to one side of the sealing block 13, and a guide limiting ring 16 fixedly connected to the outer surface of the sealing block 13 through a connecting block. In other words, the circular sealing block is connected to the annular limiting ring 16 through a plurality of radially extending connecting blocks arranged circumferentially. The limiting ring is slidably connected to the inner wall of the injection tube, and the gap between adjacent connecting blocks allows the liquid to pass through. The outer surface of the fixing liquid bag 5 is fixedly connected to a plurality of friction liquid bags 21 in communication with the fixing liquid bag 5. The friction liquid bags 21 on the surface of the fixing liquid bag 5 are designed in a hemispherical or conical shape, which can increase the contact area with the inner wall of the artery and improve the friction.

[0039] The catheter body 1 is threadedly connected to a connecting tube 31 at one end, and the connecting tube 31 is provided with an on-off valve 32. One end of the connecting tube 31 is connected to a liquid injection machine, and the other end is connected to an air suction machine.

[0040] First, the catheter body 1, injection tube 8, connecting tube 31 and other components are strictly sterilized, which can be high temperature and high pressure sterilization or ethylene oxide sterilization, etc. to ensure the sterile state of the device and prevent infection. The liquid injection machine is connected to the connecting tube 31. Then the injection tube 8 and the catheter body 1 are implanted into the renal artery of the patient under the guidance of ultrasound. Then the liquid injection machine injects cold liquid into the connecting tube 31. Then the cold liquid enters the installation ring tube 2 through the through slot 4. Then the installation ring tube 2 supplies low temperature liquid to the fixed liquid bag 5 and the sealing liquid bag 6 through the through hole 7. Then the low temperature liquid starts to expand the fixed liquid bag 5 and the sealing liquid bag 6 under the action of pressure. At the same time, the liquid in the fixed liquid bag 5 enters the friction liquid bag 21 on the surface of the fixed liquid bag 5, making the friction liquid bag 21 bulge. Multiple bulging friction liquid bags 21 contact the inner wall of the artery, increasing the friction with the inner wall of the artery, so that the fixed liquid bag 5 is stably fixed on the inner wall of the artery. At the same time, the two fixed liquid bags 5 make the catheter body 1 stably fixed on the inner wall of the artery, preventing the catheter body 1 from sliding in the artery during the subsequent flushing process, causing the catheter body 1 to deviate from its position and affecting the subsequent flushing. At the same time, the liquid enters the sealing liquid bag 6 through the through slot 4 on the installation ring tube 2. At this time, the sealing liquid bag 6 bulges, making the sealing liquid bag 6 tightly fit with the inner wall of the artery, realizing the sealing of the artery and preventing the backflow of low temperature liquid. When the fixed liquid bag 5 and the sealing liquid bag 6 are fully inflated, the catheter body 1 is stably fixed in the artery. At this time, as the pressure of the liquid injection machine gradually increases, the liquid enters the catheter body 1 through the through slot 4. Then the liquid in the catheter body 1 pushes the sealing block 13 in the injection tube 8. As the pushing force increases, the sealing block 13 moves and the spring 12 stretches. As one side of the sealing block 13 moves, the sealing block 13 separates from the sealing ring 14. At this time, the channel of the injection tube 8 is gradually opened. At the same time, the spring 12 drives the sealing block 13 to resist the pressure of the liquid, so that the fixed liquid bag 5 and the sealing liquid bag 6 always maintain the inflated state, so as to be sealed and fixed. Then the low temperature liquid enters the multiple liquid outlets 9 on the surface of the injection tube 8. At this time, the liquid pushes the sealing plate and flows out through the liquid outlets 9. The liquid flows out uniformly through the multiple liquid outlets 9, reducing the pressure of the outflow and preventing the outflow from damaging the arterial wall. Then the low temperature liquid is injected into the kidney through the renal artery to flush the kidney, realizing stable flushing of the kidney by low temperature liquid and further improving the flushing effect of the kidney.

[0041] Example two

[0042] On the basis of embodiment one, when the flushing is completed, then the open-close valve 32 on the connecting pipe 31 is closed, and the liquid injection machine is closed at the same time. At this time, the low-temperature liquid is no longer injected into the catheter body 1, and the sealing block 13 is no longer subjected to the pressure of the low-temperature liquid. At this time, the sealing block 13 is driven by the spring 12 to make the rubber sealing gasket 15 and the sealing ring 14 adhere to each other to seal, so as to prevent the liquid in the kidney from flowing back. At the same time, the closing of the open-close valve 32 makes the fixed liquid bag 5 and the sealing liquid bag 6 always maintain swelling, so that the liquid filled into the kidney cannot flow back and is kept in the kidney. In addition, in order to improve safety, avoid the fixed liquid bag or the sealing liquid bag from being over-inflated or exploded due to excessive liquid pressure, and prevent danger, a pressure alarm for monitoring the liquid pressure value in the catheter body is arranged at the liquid inlet end of the catheter body. When the pressure value exceeds the set range, the alarm is triggered and the risk is prompted.

[0043] Embodiment three

[0044] On the basis of embodiment one, when the surgery is completed and the catheter body 1 needs to be taken out, at this time, the liquid in the catheter body 1 is discharged by opening the open-close valve 32. At this time, the fixed liquid bag 5 and the sealing liquid bag 6 are contracted. Then, the connecting pipe 31 is connected with the air suction machine. At this time, the air suction machine is started. At this time, due to the sealing of the sealing block 13, the injection pipe 8 is not communicated with the catheter body 1. At this time, the air suction machine is used to suck the air in the catheter body 1, so as to suck out the liquid or gas (if the liquid is exhausted, the gas is sucked out) in the fixed liquid bag 5 and the sealing liquid bag 6. The fixed liquid bag 5 and the sealing liquid bag 6 are contracted and adhered to each other, so as to be closely combined with the surface of the installation ring pipe 2, so as to reduce the volume of the fixed liquid bag 5 and the sealing liquid bag 6. The catheter body 1, the injection pipe 8, the fixed liquid bag 5 and the sealing liquid bag 6 are taken out from the artery of the patient.

[0045] When the catheter body 1 is used, the injection pipe 8 is then rotated down from the catheter body 1, and then sterilized for reuse, so as to realize the reuse of the injection pipe 8 and further reduce the use cost.

[0046] Working principle: first, the catheter body 1, injection tube 8, connecting pipe 31 and other components are strictly sterilized, can adopt high temperature and high pressure sterilization or ethylene oxide sterilization method, ensure the sterile state of the device, prevent infection, and connect the injection machine with the connecting pipe 31, then implant the injection tube 8 and the catheter body 1 into the renal artery of the patient under the guidance of ultrasound, then inject cold liquid into the connecting pipe 31 through the injection machine, then the cold liquid enters the installation ring pipe 2 through the through slot 4, then the installation ring pipe 2 supplies low temperature liquid into the fixed liquid bag 5 and the sealing liquid bag 6 through the through hole 7, then the low temperature liquid starts to expand the fixed liquid bag 5 and the sealing liquid bag 6 under the action of pressure, at the same time, the liquid in the fixed liquid bag 5 enters the friction liquid bag 21 on the surface of the fixed liquid bag 5, so that the friction liquid bag 21 is inflated, and the multiple inflated friction liquid bags 21 contact with the inner wall of the artery, increase the friction with the inner wall of the artery, so that the fixed liquid bag 5 is stably fixed on the inner wall of the artery, and the two fixed liquid bags 5 cooperate with each other to stably fix the catheter body 1 on the inner wall of the artery, prevent the catheter body 1 from sliding in the artery during the subsequent flushing process, cause the position deviation of the catheter body 1, and affect the subsequent flushing, at the same time, the liquid enters the sealing liquid bag 6 through the through slot 4 on the installation ring pipe 2, at this time, the sealing liquid bag 6 is inflated, so that the sealing liquid bag 6 is closely attached to the inner wall of the artery, realizes the sealing of the artery, prevents the backflow of the low temperature liquid, when the fixed liquid bag 5 and the sealing liquid bag 6 are fully inflated, the catheter body 1 is stably fixed in the artery, at this time, with the gradual increase of the pressure of the injection machine, the liquid enters the catheter body 1 through the through slot 4, then the liquid in the catheter body 1 pushes the sealing block 13 in the injection tube 8, with the increase of the pushing force, at this time, the sealing block 13 moves, the spring 12 is stretched, with the movement of one side of the sealing block 13, the sealing block 13 is separated from the sealing ring 14, at this time, the channel of the injection tube 8 is gradually opened, at the same time, the spring 12 drives the sealing block 13 to resist the pressure of the liquid, so that the fixed liquid bag 5 and the sealing liquid bag 6 always maintain the inflated state, so as to be sealed and fixed, then the low temperature liquid enters the multiple liquid outlet holes 9 on the surface of the injection tube 8, at this time, the liquid pushes the sealing plate and flows out through the liquid outlet holes 9, the liquid is uniformly flowed out through the multiple liquid outlet holes 9, reduces the pressure of the flowed out liquid, prevents the artery wall from being damaged by the excessive pressure of the flowed out liquid, then the low temperature liquid is injected into the kidney through the renal artery to flush the kidney, realizes the stable flushing of the kidney by the low temperature liquid, and further improves the flushing effect of the kidney.

[0047] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A renal artery balloon catheter device for local cold perfusion, characterized by, The utility model provides a kind of injection tube and catheter, including catheter body (1), the catheter body (1) is fixedly provided with mounting ring pipe (2) on the outer surface close to liquid outlet end, two baffle (3) of sealing function are fixedly connected in the catheter body (1) interval, the mounting ring pipe (2) is located the pipe section between two baffle (3) of the catheter body (1) and two ends extend outward respectively, the liquid inlet cavity is formed between the outer surface of the catheter body (1) and the inner surface of the mounting ring pipe (2), multiple through slot (4) that are connected with the liquid inlet cavity are respectively formed on the inner wall of the pipe section of the catheter body (1) outside two baffle (3), the outer surface of the mounting ring pipe (2) is fixedly connected with a plurality of fixed liquid bag (5) and a plurality of sealing liquid bag (6), multiple through hole (7) that are connected with the liquid inlet cavity respectively of the fixed liquid bag (5) and sealing liquid bag (6) are formed on the pipe wall of the mounting ring pipe (2);The liquid outlet end of the catheter body (1) is threadedly connected with injection tube (8), and multiple liquid outlet holes (9) are formed in the outer surface of the injection tube (8);Reducing valve mechanism is fixedly connected in the injection tube (8), and the reducing valve mechanism is used to prevent liquid backflow.

2. A renal artery balloon catheter device for local cold perfusion according to claim 1, characterized in that, The reducing valve mechanism includes mounting rack (11) fixedly connected with the injection tube (8), one side of the mounting rack (11) is fixedly connected with one end of spring (12), the other end of the spring (12) is fixedly connected with sealing block (13), sealing ring (14) is fixedly connected in the injection tube (8), when the sealing block is impacted by liquid injected by the catheter body (1), the spring (12) is elongated, the sealing block (13) moves to the liquid outlet direction and away from the sealing ring (14), and liquid enters the injection tube (8) through the gap between the sealing block (13) and the sealing ring (14).

3. A renal artery balloon catheter device for local cold perfusion according to claim 2, characterized in that, Rubber sealing pad (15) is fixedly connected to one side of the sealing block (13) towards the sealing ring (14).

4. A renal artery balloon catheter device for local cold perfusion according to claim 2, characterized in that, The outer surface of the sealing block (13) is fixedly connected with guide limiting ring (16) slidingly connected with the injection tube (8) through connecting block.

5. A renal artery balloon catheter device for local cold perfusion according to claim 1, characterized in that, Multiple friction liquid bags (21) are fixedly provided on the outer surface of the fixed liquid bag (5) and connected with the fixed liquid bag (5).

6. A renal artery balloon catheter device for local cold perfusion according to claim 1, characterized in that, The liquid inlet end of the connecting pipe (31) is connected with liquid injection machine.

7. A renal artery balloon catheter device for local cold perfusion according to claim 6, characterized in that, One end of the connecting pipe (31) is connected with air suction machine or liquid suction pump.

8. A renal artery balloon catheter device for local cold perfusion according to claim 6, characterized in that, There are two fixed liquid bags (5) and they are arranged at two ends of the mounting ring pipe (2), and there are two sealing liquid bags (6) and they are arranged at the middle pipe section of the mounting ring pipe (2).

9. The renal artery balloon catheter device for local cold perfusion according to claim 1, wherein, The catheter body is provided with pressure alarm for monitoring the pressure value inside the catheter body at the liquid inlet end.

10. A renal artery balloon catheter device for local cold perfusion according to any one of claims 1 to 9, characterized in that, ​

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