An intelligent balloon dilation catheter based on real-time pressure feedback

Abstract

The present application relates to the technical field of intervention treatment, and especially relates to an intelligent balloon dilatation catheter based on real-time pressure feedback. The intelligent balloon dilatation catheter comprises an external injection head, a main pipe fixedly connected with the external injection head, a dilatation balloon fixedly connected with the main pipe, two occlusion balloons fixedly connected with the main pipe, the dilatation balloon being located between the two occlusion balloons, a pressure sensor fixedly connected with the main pipe and located in the dilatation balloon and the two occlusion balloons, and two medicine injection assemblies arranged on the main pipe. The two occlusion balloons are inflated to occlude the blood vessel, a closed static drug action area is constructed at the stenosis lesion of the blood vessel, and the medicine liquid is injected into the static drug action area, so that the blood flow is effectively isolated to create sufficient blood vessel wall penetration time for the medicine liquid, the drug action concentration in the target area is maintained, the local utilization rate of the drug is improved, the treatment effect is improved, and the target treatment of the dilated blood vessel wall is realized.

Description

Technical Field

[0001] This invention relates to the field of interventional therapy technology, and in particular to an intelligent balloon dilation catheter based on real-time pressure feedback. Background Technology

[0002] Percutaneous coronary intervention (PCI) is a major means of revascularization for vascular stenosis diseases such as coronary heart disease and peripheral artery occlusion. During the procedure, the balloon dilation catheter is inflated under high pressure to expand the balloon, mechanically crushing atherosclerotic plaques and restoring patency of the lumen. However, after simple balloon dilation, restenosis often occurs at the lesion site due to vascular elastic recoil and excessive proliferation of smooth muscle, which seriously affects the long-term efficacy. To inhibit this process, drug-coated balloons (DCBs) have emerged. By coating the outer surface of the balloon with anti-proliferative drugs, the drugs are transferred to the vessel wall during dilation, continuously inhibiting intimal hyperplasia. This technology has been proven in clinical studies to effectively reduce the restenosis rate.

[0003] Existing DCBs have significant limitations: the drug is only physically adsorbed or encapsulated on the surface of the balloon folds. During delivery along the tortuous blood vessels to the target lesion, the high-speed blood flow continuously washes away the drug, causing most of it to detach and be lost before reaching the target. At the same time, the coating is fractured due to tensile stress during the rapid inflation and expansion of the balloon, and a large number of drug particles are ejected into the blood flow rather than being pressed into the vessel wall. Ultimately, the proportion of drug that actually enters and remains in the vessel wall is extremely low, which seriously weakens the local therapeutic concentration and limits the clinical application of DCBs in complex calcified lesions. Summary of the Invention

[0004] To overcome the shortcomings mentioned in the background art, the present invention provides an intelligent balloon dilation catheter based on real-time pressure feedback.

[0005] The technical solution of the present invention is as follows: a smart balloon dilation catheter based on real-time pressure feedback, comprising an external injection head, a main tube fixedly connected to the external injection head, an expansion balloon fixedly connected to the main tube, two symmetrically distributed occlusion balloons fixedly connected to the main tube, the expansion balloon being located between the two symmetrically distributed occlusion balloons, a first injection tube and a second injection tube fixedly connected to the main tube, the external injection head communicating with the expansion balloon through the first injection tube, and the external injection head communicating with the two occlusion balloons through the second injection tube, pressure sensors fixedly connected to both the expansion balloon and the two occlusion balloons in the main tube, and two symmetrically distributed drug delivery components disposed on the main tube, the two drug delivery components being respectively located between the two occlusion balloons and the expansion balloon.

[0006] As a preferred embodiment of the present invention, the externally fixedly connected dilatation balloon is provided with a plurality of uniformly distributed protrusions.

[0007] As a preferred embodiment of the present invention, the drug injection assembly includes a drug storage cylinder, which is fixedly connected to the main pipe. The drug storage cylinder is provided with a rotating ring, which is provided with a plurality of injection holes distributed circumferentially. A pressure valve is provided in each injection hole. The drug storage cylinder is slidably connected to a piston plate, which divides the drug storage cylinder into a pushing chamber and a drug storage chamber. The injection holes communicate with the corresponding drug storage chambers of the drug storage cylinder.

[0008] As a preferred embodiment of the present invention, the drug storage cylinder is fixedly connected to the corresponding occlusion balloon and is connected by a connecting pipe, and the occlusion balloon is connected to the pushing cavity of the corresponding drug storage cylinder through the corresponding connecting pipe.

[0009] As a preferred embodiment of the present invention, an elastic element is fixedly connected between the medicine storage cylinder and the corresponding piston plate, and the elastic element is located in the pushing cavity of the medicine storage cylinder.

[0010] As a preferred embodiment of the present invention, the injection holes distributed circumferentially on the two symmetrically distributed rotating rings are staggered.

[0011] As a preferred embodiment of the present invention, the rotating ring is fixedly connected with a plurality of guide tubes on the side near the dilating balloon. The plurality of guide tubes are the same number as the plurality of injection holes on the rotating ring. The guide tubes are connected to the corresponding injection holes and are used to guide the drug solution discharged from the corresponding injection holes.

[0012] As a preferred embodiment of the present invention, the medicine storage cylinder and the rotating ring thereon are in a sealed rotatable connection.

[0013] As a preferred embodiment of the present invention, the rotating ring is fixedly connected to the storage chamber of the corresponding medicine storage cylinder with a fixed ring, the fixed ring is rotatably connected to the corresponding medicine storage cylinder with a seal, the fixed ring is provided with a guide groove, and the piston plate is fixedly connected to a push rod, the push rod sliding in the corresponding guide groove.

[0014] As a preferred embodiment of the present invention, an elastic rod is fixedly connected inside the medicine storage cylinder, and a limiting block is fixedly connected to one end of the elastic rod away from the inner wall of the medicine storage cylinder. The pushing rod is fixedly connected to a plurality of linearly distributed locking blocks, and the limiting block is used to unidirectionally limit the plurality of linearly distributed locking blocks.

[0015] Beneficial effects: 1. This invention uses two occlusion balloons to expand and occlude blood vessels, creating a closed static drug action zone at the narrowing lesion of the blood vessel. The drug solution is then injected into the static drug action zone, which can effectively isolate blood flow and create sufficient time for the drug solution to penetrate the blood vessel wall, while maintaining the concentration of the drug in the target area, thereby improving the local utilization rate and therapeutic effect of the drug, and achieving the purpose of targeted treatment on the dilated blood vessel wall.

[0016] 2. The drug reservoir is connected to the pressurization circuit of the corresponding occlusion balloon through a connecting tube. The pressure of the inflated occlusion balloon pushes the piston plate, which in turn pushes the drug solution in the reservoir into the blood vessel. The drug injection can be automatically started after the occlusion is completed without the operator's additional operation, which simplifies the surgical procedure, reduces the delay and risk of accidental operation, and improves the efficiency and reliability of the operation.

[0017] 3. By pushing the drug solution into the blood vessel through the piston plate, the rotating ring rotates synchronously, causing the injection hole to continuously change the injection direction. This achieves dynamic sweeping coverage of the drug solution around the blood vessel wall, effectively reducing the probability of drug concentration in a single direction, improving the uniformity of drug distribution around the lesion, thereby enhancing the contact area and penetration effect between the drug and the blood vessel wall, and improving the quality of targeted therapy.

[0018] 4. By using a locking block and a limiting block to lock the push rod in one direction, the piston plate cannot be reversed after the injection is completed. This prevents the blood in the blood vessel from being sucked into the drug reservoir along the guide tube and injection hole due to negative pressure generated by the piston plate retraction during the subsequent repositioning process of the piston plate, thus ensuring the safety of the operation. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional cross-sectional view of the main tube, dilation balloon, and occlusion balloon of the present invention; Figure 3 This is a three-dimensional structural diagram of the connecting tube of the present invention; Figure 4 This is a three-dimensional cross-sectional view of the medicine storage cylinder of the present invention; Figure 5 This is a three-dimensional structural diagram of the limiting block and the locking block of the present invention.

[0020] The markings in the diagram are as follows: 1-External injection head, 2-Main pipe, 3-Expansion balloon, 4-Occlusion balloon, 5-First injection tube, 6-Second injection tube, 7-Pressure sensor, 8-Protrusion, 201-Drug reservoir, 202-Rotating ring, 203-Injection hole, 204-Piston plate, 205-Connecting tube, 206-Elastic element, 207-Guide tube, 301-Fixing ring, 302-Guide groove, 303-Push rod, 401-Elastic rod, 402-Limiting block, 403-Clamping block. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but this does not limit the scope of protection and application of the present invention.

[0022] In existing drug-coated balloons, the drug adheres to the balloon surface only through physical adsorption, making it easily washed away by blood flow during delivery through tortuous blood vessels. During rapid balloon expansion, the coating experiences tensile stress, creating a "popcorn effect" where a large number of drug particles are ejected into the bloodstream rather than being forced into the vessel wall. Ultimately, the proportion of drug retained on the target vessel wall is extremely low, severely weakening the local therapeutic concentration and limiting its clinical efficacy in complex calcified lesions.

[0023] Example 1

[0024] This embodiment provides an intelligent balloon dilation catheter based on real-time pressure feedback to improve surgical outcomes.

[0025] Combination Figures 1-3As shown, the device includes an external injection head 1, which serves as the sole physical interface between the entire instrument and the external operating system. It connects the pressure pump and signal receiving device, enabling bidirectional transmission of saline injection and pressure signals. This centralized management of the complex multi-lumen tubing reduces the number of intraoperative interfaces, lowers operational complexity, and reduces the risk of leakage. The external injection head 1 is fixedly connected to a main pipe 2, which in turn is fixedly connected to an expansion balloon 3. Two symmetrically distributed occlusion balloons 4 are also fixedly connected to the main pipe 2. The expansion balloon 3 is positioned between the two symmetrically distributed occlusion balloons 4. The two occlusion balloons 4 are used to occlude both ends of the stenotic lesion, cutting off blood flow in the stenotic area and preventing the medication from being washed away by the high-speed blood flow during subsequent drug administration. The main pipe 2 acts as a skeletal support, ensuring the coaxiality and structural stability of the expansion balloon 3 and the two occlusion balloons 4 during intravascular delivery. The main pipe 2 is fixedly connected to a first injection tube 5 and a second injection tube 6. The external injection head 1 connects to the expansion balloon via the first injection tube 5. The external injection head 1 is connected to the two occlusion balloons 4 through the second injection tube 6. The first injection tube 5 is a dedicated inflation and deflation channel for the expansion balloon 3, and the second injection tube 6 is a shared inflation and deflation channel for the two occlusion balloons 4. The main pipe 2 is fixedly connected to pressure sensors 7 inside both the expansion balloon 3 and the two occlusion balloons 4. The pressure sensors 7 are MEMS piezoresistive pressure sensors, which are connected to an external signal receiving device (not shown in the figure) through an optical fiber to realize real-time monitoring of the liquid pressure changes inside the expansion balloon 3 and the two occlusion balloons 4. Two symmetrically distributed drug injection components are set on the main pipe 2, which are located between the two occlusion balloons 4 and the expansion balloon 3, respectively. Several evenly distributed protrusions 8 are fixedly connected to the outside of the expansion balloon 3. When the expansion balloon 3 expands, the protrusions 8 are embedded in the surface of the hardened plaque, generating a multi-point high-pressure micro-area destruction effect, enhancing the ability to fragment the hardened plaque, and reducing the probability of the expansion balloon 3 slipping and deviating as a whole, thereby improving expansion efficiency and positioning accuracy.

[0026] Combination Figures 2-4As shown, the injection assembly includes a drug reservoir 201, which is fixedly connected to the main pipe 2. The drug reservoir 201 is equipped with a rotating ring 202. In this embodiment, the connection between the drug reservoir 201 and the corresponding rotating ring 202 is fixed, but this is limited to this embodiment. The rotating ring 202 is provided with a plurality of circumferentially distributed injection holes 203. Pressure valves are provided within the injection holes 203. The drug reservoir 201 is slidably connected to a piston plate 204, which divides the drug reservoir 201 into a pushing chamber and a storing chamber. The storing chamber of the drug reservoir 201 is used for pre-filling the drug solution for injection. The orifice 203 is connected to the storage chamber of the corresponding drug reservoir 201. A pressure valve inside the injection orifice 203 is used to seal the drug solution in the storage chamber of the drug reservoir 201, allowing the pressure valve to open only under pressure. The drug reservoir 201 is fixedly connected to the corresponding occlusion balloon 4 and is connected by two symmetrically distributed connecting tubes 205. The occlusion balloon 4 is connected to the push chamber of the corresponding drug reservoir 201 through the corresponding connecting tube 205, allowing the saline solution inside the occlusion balloon 4 to enter the push chamber of the drug reservoir 201 along the corresponding connecting tube 205, thereby propelling the saline solution. The piston plate 204 moves, and the connecting pipe 205 is elastic and flexible to adapt to the positional change of the occlusion balloon 4 after expansion. An elastic element 206 is fixedly connected between the drug reservoir 201 and the corresponding piston plate 204. The elastic element 206 is a tension spring and is used to ensure the stability of the piston plate 204. The elastic element 206 is located in the pushing cavity of the drug reservoir 201. The elastic coefficient of the elastic element 206 is greater than that of the corresponding occlusion balloon 4, so that after the occlusion balloon 4 expands to its limit position, the drug liquid pushes the corresponding piston plate against the force of the elastic element 206. In the 204 movement, the two symmetrically distributed rotating rings 202 have a number of injection holes 203 that are staggered around the circumference to ensure the overall uniformity of drug injection into the blood vessel by the two rotating rings 202. Several guide tubes 207 are fixedly connected to the side of the rotating ring 202 near the dilation balloon 3. The number of guide tubes 207 is the same as the number of injection holes 203 on the rotating ring 202. The guide tubes 207 are connected to the corresponding injection holes 203. The guide tubes 207 are used to guide the drug solution discharged from the corresponding injection hole 203, so that the drug solution is sprayed toward the blood vessel wall, thereby increasing the penetration content of the drug solution into the blood vessel wall.

[0027] Working principle: When using this device to dilate a patient's stenotic lesion, medical staff inject the medication into the corresponding drug reservoir 201 through the guide tube 207. After the medication is injected into both drug reservoirs 201, the medical staff punctures the femoral or radial artery to create an incision, and then implants a vascular sheath at the incision (allowing the instrument to enter and exit while preventing blood extravasation). Then, the medical staff implants this device into the patient's artery through a guide wire and delivers the device to the position to be dilated, so that the two occlusion balloons 4 are located at both ends of the stenotic lesion. When the device reaches the dilation position, the medical staff connects the first injection tube 5 and the second injection tube 6 to the external pressure pump through the external injection head 1, and at the same time connects the pressure sensor 7 to the external information receiving device. After the connection is completed, the staff first injects physiological saline into the first injection tube 5 through the external pressure pump. The physiological saline flows into the dilation balloon 3 along the first injection tube, causing the dilation balloon 3 to begin to dilate. The dilation balloon 3 compresses and dilates the blood vessel at the stenotic lesion, gradually restoring the blood vessel to its normal diameter and crushing the atherosclerotic plaque.

[0028] After the dilation is completed, medical staff operate the pressure pump to reverse the flow of saline solution from the first injection tube 5. The saline solution in the dilation balloon 3 returns along the same path as the first injection tube 5, causing the dilation balloon 3 to contract to its initial shape. At this moment, the medical staff operate the pressure pump to inject saline solution into the second injection tube 6, allowing the saline solution to enter the two corresponding occlusion balloons 4. The occlusion balloons 4 begin to inflate. This continues until both occlusion balloons 4 inflate to their limit position, after which they jointly occlude the blood vessel, preventing blood flow at the stenotic lesion. (The following discussion focuses on one occlusion balloon 4.) The external pressure pump continues to deliver saline solution to the second injection tube 6. The occlusion balloon 4 can no longer inflate, and the saline solution inside begins to enter the push chamber of the corresponding drug reservoir 201 along the two symmetrically distributed connecting tubes 205. The saline solution begins to push the piston plate 204 to slide along the drug reservoir 201, while the elastic element 206 stretches, causing the piston plate 204 to... 4. The medication in the storage chamber of the drug reservoir 201 flows outward along several injection holes 203 on the rotating ring 202. After flowing along the injection holes 203 and opening the internal pressure valve, the medication enters the corresponding guide tube 207. Finally, the medication is sprayed outward along the guide tube 207 towards the inner wall of the blood vessel, so that the medication mixes with the blood at the stenotic lesion and continuously seeps into the blood vessel wall to ensure the effectiveness of the medication. This continues until the medication in the storage chamber of the drug reservoir 201 is injected and maintained for a certain period of time (the specific time can be set freely according to the patient's condition), allowing sufficient time for the medication to seep into the blood vessel wall. Then, the medical staff operates the pressure pump to draw saline from the second injection tube 6, causing the saline in the pushing chamber of the drug reservoir 201 and the occlusion balloon 4 to flow back along the second injection tube 6. The elastic element 206 resets, driving the corresponding piston plate 204 to reset synchronously along the corresponding drug reservoir 201. Subsequently, the occlusion balloon 4 begins to contract. When the occlusion balloon 4 contracts to its initial state, the staff removes the device along the wound. At this moment, the dilation of the stenotic lesion is completed.

[0029] Example 2

[0030] This embodiment provides an intelligent balloon dilation catheter based on real-time pressure feedback, which is a further improvement on Embodiment 1.

[0031] Combination Figures 3-5As shown, the medicine storage cylinder 201 and its upper rotating ring 202 are sealed and rotatably connected. The rotating ring 202 is fixedly connected to the medicine storage cavity of the corresponding medicine storage cylinder 201 with a fixed ring 301. The fixed ring 301 is sealed and rotatably connected to the corresponding medicine storage cylinder 201. The fixed ring 301 is provided with two circumferentially distributed guide grooves 302. The guide grooves 302 are helical grooves. The piston plate 204 is fixedly connected to two circumferentially distributed push rods 303. The push rods 303 slide in the corresponding guide grooves 302. When the piston plate 204 is pushed by physiological saline to slide linearly along the corresponding medicine storage cylinder 201, the piston plate 204 slides along the guide grooves 302 through the push rods 303. Since the guide grooves 302 have a helical helix angle, the axial displacement of the push rods 303 is forcibly converted into the circumferential rotational motion of the fixed ring 301 and the rotating ring 202.

[0032] Combination Figure 4 and Figure 5 As shown, two symmetrically distributed elastic rods 401 are fixedly connected to the inner wall of the medicine storage cylinder 201. The elastic rods 401 themselves are elastic and maintain the tilted state shown in the figure when no force is applied. A limiting block 402 is fixedly connected to the end of the elastic rod 401 away from the inner wall of the corresponding medicine storage cylinder 201. The limiting block 402 has an inclined surface. Several linearly distributed locking blocks 403 are fixedly connected to the push rod 303. The cross-section of the locking block 403 is a right-angled triangle, and the shorter right-angled side is in contact with the corresponding push rod 303. The limiting block 402 is used to unidirectionally limit the corresponding linearly distributed locking blocks 403. The pushing rod 303 drives the inclined surface of the locking block 403 to press against the inclined surface of the corresponding limiting block 402. The limiting block 402 is driven by the squeezing force to move the adjacent end of the elastic rod 401 close to the inner wall of the medicine storage cylinder 201, so that the limiting block 402 passes over the locking block 403, ensuring the normal movement of the pushing rod 303. The long right-angle side of the locking block 403 cooperates with the limiting block 402 to block the reset movement of the pushing rod 303.

[0033] Working principle: During the process of injecting the drug solution into the blood vessel by sliding the piston plate 204 along the corresponding drug storage cylinder 201, the piston plate 204 drives the two symmetrically distributed push rods 303 to move synchronously. The push rods 303 slide along the corresponding guide grooves 302. At this time, the push rods 303 drive the rotating ring 202 to rotate through the corresponding guide grooves 302. The rotating ring 202 drives the injection hole 203 on it to rotate synchronously, thereby continuously changing the injection position of the drug solution and improving the uniformity of drug solution injection. This continues until the drug solution in the storage chamber of the drug storage cylinder 201 is injected.

[0034] During the process of the piston plate 204 driving the push rod 303, the push rod 303 drives several linearly distributed locking blocks 403 to move synchronously. The locking blocks 403 squeeze the corresponding limiting blocks 402. The limiting blocks 402, under the squeezing force, drive the adjacent ends of the corresponding elastic rods 401 to approach the inner wall of the corresponding drug reservoir 201, so that the limiting blocks 402 pass over the locking blocks 403. Then, the elastic rods 401 reset and insert between the two adjacent locking blocks 403 under their own elastic force. This process is repeated until the push rod 303 moves to its limit position and stops. Then, the elastic rods 401 reset and insert between the two adjacent locking blocks 403 under their own elastic force. The limiting blocks 402 unidirectionally limit the locking blocks 403, preventing them from resetting. That is, the push rod 303 cannot reset, so as to prevent blood in the blood vessels from entering the drug reservoir 201 along the guide tube 207 and the injection hole 203 when the piston plate 204 resets, thus ensuring the safety of the operation.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A smart balloon dilation catheter based on real-time pressure feedback, comprising an external injection head (1), wherein the external injection head (1) is fixedly connected to a main tube (2), and the main tube (2) is fixedly connected to a dilation balloon (3), characterized in that, The main tube (2) is fixedly connected to two symmetrically distributed occlusion balloons (4), and the expansion balloon (3) is located between the two symmetrically distributed occlusion balloons (4). The main tube (2) is fixedly connected to a first injection tube (5) and a second injection tube (6). The external injection head (1) is connected to the expansion balloon (3) through the first injection tube (5), and the external injection head (1) is connected to the two occlusion balloons (4) through the second injection tube (6). The main tube (2) is fixedly connected to pressure sensors (7) in both the expansion balloon (3) and the two occlusion balloons (4). The main tube (2) is provided with two symmetrically distributed drug injection components, which are located between the two occlusion balloons (4) and the expansion balloon (3), respectively.

2. The intelligent balloon dilation catheter based on real-time pressure feedback according to claim 1, characterized in that, The dilatation balloon (3) is externally fixed with several evenly distributed protrusions (8).

3. The intelligent balloon dilation catheter based on real-time pressure feedback according to claim 1, characterized in that, The drug injection assembly includes a drug reservoir (201), which is fixedly connected to the main pipe (2). The drug reservoir (201) is provided with a rotating ring (202), which is provided with a plurality of injection holes (203) distributed circumferentially. A pressure valve is provided in the injection hole (203). The drug reservoir (201) is slidably connected to a piston plate (204). The piston plate (204) divides the drug reservoir (201) into a pushing chamber and a drug storage chamber. The injection hole (203) communicates with the corresponding drug storage chamber of the drug reservoir (201).

4. A smart balloon dilation catheter based on real-time pressure feedback according to claim 3, characterized in that, The drug reservoir (201) is fixedly connected to the corresponding occlusion balloon (4) and is connected by a connecting tube (205). The occlusion balloon (4) is connected to the push chamber of the corresponding drug reservoir (201) through the corresponding connecting tube (205).

5. A smart balloon dilation catheter based on real-time pressure feedback according to claim 3, characterized in that, An elastic element (206) is fixedly connected between the medicine storage cylinder (201) and the corresponding piston plate (204), and the elastic element (206) is located in the pushing cavity of the medicine storage cylinder (201).

6. A smart balloon dilation catheter based on real-time pressure feedback according to claim 3, characterized in that, The two symmetrically distributed rotating rings (202) have a plurality of injection holes (203) that are circumferentially distributed in a staggered manner.

7. A smart balloon dilation catheter based on real-time pressure feedback according to claim 6, characterized in that, The rotating ring (202) has a plurality of guide tubes (207) fixedly connected to one side near the dilating balloon (3). The number of the plurality of guide tubes (207) is the same as the number of the plurality of injection holes (203) on the rotating ring (202). The guide tubes (207) are connected to the corresponding injection holes (203). The guide tubes (207) are used to guide the liquid medicine discharged from the corresponding injection hole (203).

8. A smart balloon dilation catheter based on real-time pressure feedback according to claim 3, characterized in that, The medicine storage cylinder (201) and the rotating ring (202) mentioned above are connected in a sealed rotational manner.

9. A smart balloon dilation catheter based on real-time pressure feedback according to claim 8, characterized in that, The rotating ring (202) is fixedly connected to the storage chamber of the corresponding medicine storage cylinder (201) with a fixed ring (301). The fixed ring (301) is sealed and rotatably connected to the corresponding medicine storage cylinder (201). The fixed ring (301) is provided with a guide groove (302). The piston plate (204) is fixedly connected with a push rod (303). The push rod (303) slides in the corresponding guide groove (302).

10. A smart balloon dilation catheter based on real-time pressure feedback according to claim 9, characterized in that, An elastic rod (401) is fixedly connected inside the medicine storage cylinder (201). A limiting block (402) is fixedly connected to one end of the elastic rod (401) away from the inner wall of the medicine storage cylinder (201). A number of linearly distributed locking blocks (403) are fixedly connected to the push rod (303). The limiting block (402) is used to unidirectionally limit the number of linearly distributed locking blocks (403).

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