A shield device for opening a vascular lumen occlusion

Abstract

A shield device for opening the intravascular occlusion, which belongs to the technical field of medical equipment, comprises a drill bit with a flexible shaft drive, a propelling pipe, a first guide pipe, a first supporting air bag, a second supporting air bag, a second guide pipe, a flushing pump, a negative pressure pump, a dosing pump, a sensor, a pump, a PC-based processing device, a cable, a drive motor reduction mechanism; the drill bit pipe, the liquid supply pipe, the liquid suction pipe and a plurality of first traction pipes are fixedly installed on the lower end of the upper part of the propelling pipe; the second guide pipe has an opening on one side of the upper end; the sensor fixing pipe, the medicine spraying pipe and a plurality of second traction pipes are fixedly installed on the other side of the lower part of the upper end of the second guide pipe. The new device, under the joint action of related mechanisms, realizes accurate three-dimensional positioning and controllable guidance in the blood vessel cavity, can adapt to the arterial running and the occluded part, thereby achieving efficient, safe and directional tunneling and blood vessel opening effect, and plays a favorable technical support for the treatment of peripheral atherosclerotic occlusion, and has a good application prospect.

Description

Technical Field

[0001] This utility model relates to the field of medical equipment technology, and in particular to a shield tunneling device for opening occlusions in blood vessels. Background Technology

[0002] Peripheral artery occlusion is one of the main causes of limb ischemia. Over a long course, atherosclerotic plaques (hereinafter referred to as plaques) gradually calcify, degenerate, and harden, making the current use of endovascular interventional techniques to open occluded arteries and remove plaques still challenging. Therefore, there is an urgent need for specialized instruments with excellent positioning, cutting, dissection, and volume reduction capabilities to precisely target the lesion area, grind away the plaque, and remove it from the body, thereby achieving the goals of vascular recanalization, plaque reduction, and lumen reconstruction. This interventional procedure mainly includes two key steps: guidewire opening of the lesion segment and plaque resection. Current interventional resection devices all require the guidewire to first pass through the occluded segment and enter the distal true lumen; therefore, guidewire guidance is an indispensable prerequisite. Its basic structure includes: (1) a thin metal guidewire for positioning, with a pre-set angled bend at the front end to pass through the plaque area; (2) a working component that is fitted over the guidewire and can be advanced along the guidewire, containing a rotary cutting head and other related components; (3) an operating component located outside the patient's body to control the advance and retreat of the rotary cutting head; and (4) a transmission structure connecting the operating component and the working component. In addition, the operation also relies on digital subtraction angiography (DSA) equipment to monitor the position of blood vessels and instruments in real time (processed and displayed by a PC-based processing device). During the operation, under the guidance of DSA images, the surgeon first passes the guidewire through the occluded segment; then the rotary cutting device is advanced along the guidewire to the location of the plaque; the rotary cutting device is activated to complete the removal of the plaque and the removed tissue is extracted from the body; finally, the guidewire is withdrawn. In this technical field, the most representative existing technologies include the SilverHawk and TurboHawk systems launched by Medtronic, and the Jetstream device from Boston Scientific.

[0003] Although existing rotary cutting devices have certain cutting and separation capabilities, they still have the following limitations in practical applications: (1) The guidewire needs to pass through the occluded segment entirely within the true lumen of the blood vessel. However, in actual operation, the guidewire usually enters the subendothelial layer of the artery, which can easily lead to arterial wall rupture during rotary cutting, posing a high risk; (2) The process of the guidewire passing through the occluded arterial segment takes a long time, making the surgery difficult. In some cases, it is difficult to successfully open the blood vessel, leading to surgical failure; (3) Subsequent steps such as positioning and advancement all rely on guidewire guidance. Successful penetration is a prerequisite for the surgery. For plaques whose hardness is still within the range that the guidewire can break through, the entire system is still difficult to pass through, and pre-dilation with a small balloon is often required, which can easily cause Incomplete plaque reduction; in addition, when the guidewire comes into contact with a hard plaque, it is easy to bend or coil due to mechanical limitations, and cannot be effectively penetrated, resulting in the device being unable to follow smoothly; (4) Plaque tissue has heterogeneous characteristics in terms of composition, and may contain different structures such as hard calcification, tough fibrous cap and soft lipid. When traveling in a long plaque, the resistance encountered by the guidewire will be deflected due to the difference in composition, thus deviating from the preset ideal working position, making it difficult to achieve directional plaque reduction; (5) Even if the guidewire successfully passes through the target lesion, the existing equipment still has limitations in the local fine cutting of plaque, such as inaccurate positioning, the cutting head is too close to the normal blood vessel wall, which can easily cause damage to the vessel wall, perforation or rupture. The main reasons for the above problems can be summarized as follows: (1) The directional positioning function of the rotary cutting device depends on the passage of the guidewire in the true lumen of the blood vessel. As a thin metal structure, the guidewire has an inherent upper limit in terms of material science, making it difficult to penetrate some high-hardness plaques; (2) The rotary cutting head is usually only set in a certain direction on the side of the working part. Each rotary cutting can only remove plaque tissue on one side. In order to complete the circumferential removal, the working part needs to be rotated multiple times to adjust the direction, which increases the operation steps and time. Even in multi-directional rotary cutting devices, it is difficult to ensure that the cutting head is always in the center of the lumen; (3) The forward and backward movement of the working part depends on the operator's experience in pushing. When this action is transmitted to the plaque site through the connecting structure, the force may be applied. (4) Blood vessels are dynamic structures, and changes in hemodynamics and patient muscle movements can cause changes in their morphology. However, the adjustment mechanism of existing rotary cutting equipment is relatively complicated and lacks an effective means to adjust the position and direction of the cutting head in real time. It is easy to cause vascular damage due to untimely response. (5) The positioning of existing guidewires and rotary cutting equipment in the blood vessel lumen mainly relies on DSA technology. This technology can only provide two-dimensional planar images and lacks depth direction information. It is difficult to accurately determine the actual position of the instrument in the three-dimensional lumen space, which further aggravates the occurrence of the problem in (4). (6) Traditional rotary cutting equipment has no drug coating capability and cannot spray drug treatment (such as hemostasis) on the cutting site. Utility Model Content

[0004] To overcome the shortcomings of existing rotary cutting equipment due to structural limitations, as described in the background art, this utility model provides a shield tunneling device for opening vascular occlusions. This device, through the combined action of related mechanisms, achieves precise three-dimensional positioning and controllable guidance within the vascular lumen, and can adapt to the course of the artery and the occlusion site, thereby achieving efficient and safe directional tunneling and vascular opening effects. This provides favorable technical support for the treatment of peripheral arterial atherosclerosis occlusion.

[0005] The technical solution adopted by this utility model to solve its technical problem is: A tunnel boring machine (TBM) for opening endovascular occlusion includes a drill bit with a flexible shaft drive, a propulsion tube, a first guide tube, a first support airbag, a second support airbag, a second guide tube, a flushing pump, a negative pressure pump, a drug delivery pump, a sensor, an air pump, a PC-based processing device, cables, and a drive motor reduction mechanism. The upper and lower ends of the propulsion tube are fixedly mounted with a drill bit tube, a liquid delivery tube, a liquid suction tube, and multiple first traction tubes. The flexible shaft of the drill bit rotates within the drill bit tube, and the drill bit is located outside the upper end of the propulsion tube. Multiple cables are present, with the upper ends of each cable fixedly mounted within one of the multiple first traction tubes. The lower end of the propulsion tube and the upper end of the first guide tube are fixed... The first support airbag is fixedly installed on the outside of the first guide tube, and the first inflation tube is fixedly installed at the lower end of the first support airbag. There is an opening on one side of the upper end of the second guide tube, and the lower outside of the first guide tube is fixedly installed in the opening of the second guide tube. A sensor fixing tube, a spraying tube, and multiple second traction tubes are fixedly installed on the lower part of the other side of the upper end of the second guide tube. The sensor is fixedly installed in the sensor fixing tube, and the upper ends of multiple cables are fixedly installed in multiple second traction tubes. The second support airbag is fixedly installed on the outside of the second guide tube, and the second inflation tube is fixedly installed at the lower end of the second support airbag.

[0006] Furthermore, the lower parts of the drill bit's flexible shaft, liquid supply pipe, liquid suction pipe, spraying pipe, and multiple cables, as well as the lower parts of the wires connected to the sensor, are respectively located outside the lower end of the second guide tube.

[0007] Furthermore, the lower parts of the first inflation tube and the second inflation tube are located outside the lower end of the second guide tube, respectively.

[0008] Furthermore, the core of the flexible shaft is made of stainless steel, the flexible hose is made of polytetrafluoroethylene, a special-shaped drive tube is installed on the front side of the shaft of the drive motor reduction mechanism, and the special-shaped drive shaft at the lower end of the flexible shaft is fixedly installed inside the drive tube; the cable is a thin and soft stainless steel wire rope.

[0009] Furthermore, the lower part of the liquid infusion tube and the lower part of the liquid suction tube are fixedly connected to the liquid outlet of the drug delivery pump and the liquid inlet of the negative pressure pump, respectively. The liquid outlet of the drug delivery pump is fixedly connected to the lower part of the spray tube, and the lower parts of the first air inflation tube and the second air inflation tube are fixedly connected in parallel to the air outlet of the air pump, respectively.

[0010] Furthermore, the outer diameter of the first support airbag is smaller than the outer diameter of the second support airbag, the inner diameter of the inner ring of the first support airbag is smaller than the outer diameter of the first guide tube, and the inner diameter of the inner ring of the second support airbag is smaller than the outer diameter of the second guide tube.

[0011] Furthermore, the first and second support airbags are made of medical-grade silicone, while the first guide tube, second guide tube, first inflation tube, second inflation tube, spray tube, first traction tube, second traction tube, fixation tube, drug delivery tube, and suction tube are made of medical-grade polytetrafluoroethylene.

[0012] Furthermore, the upper part of the propulsion tube, the upper part of the second guide tube, the upper and lower outer sides of the first and second support airbags are all arc transition structures.

[0013] Compared with the prior art, the advantages of this utility model are: (1) It has multiple cables, which can adjust and change the angle of the drill bit entering the blood vessel, thereby guiding the working part (drill bit) to contact the plaque in a directional manner, realizing operation without guide wire guidance and passing through curved occluded arterial segments; (2) The working part head is integrated with one or more sensors, which can be displayed by the processing equipment and can sense the spatial position of the instrument in the blood vessel lumen in real time, especially able to identify the relative distance and position between the reamer head (drill bit) and the adventitia of the blood vessel, improving the intuitiveness and safety of the operation; (3) It has With first and second support airbags, after inflation or liquid expansion, the instrument can be stabilized and ensured to be in the central position within the blood vessel lumen, while also blocking blood flow and reducing the risk of distal arterial embolism during the operation; (4) The use of a motor deceleration mechanism and other power-assisted propulsion mechanisms avoids the force transmission loss and operational instability in traditional manual drive, improving the controllability and efficiency of the vascular plaque excavation process; (5) A drug spraying system (such as a spray pipe) is provided, which can apply drugs to the vascular wound for hemostasis after the plaque is cleared through shield tunneling, reducing the probability of restenosis in the blood vessel. In summary, with the joint action of relevant mechanisms, this utility model achieves precise three-dimensional positioning and controllable guidance within the blood vessel lumen, and can adapt to the course of the artery and the occlusion site, thereby achieving efficient and safe directional excavation and blood vessel opening, providing favorable technical support for the treatment of peripheral arterial atherosclerosis occlusion. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a partial three-dimensional structural schematic diagram of the present invention.

[0016] Figure 2 This is a partial planar structural schematic diagram of the present invention from a side view.

[0017] Figure 3 ,4 This is a top view of a partial planar structure of the present invention. Detailed Implementation

[0018] Figure 1 , 2As shown in Figures 3 and 4, a shield tunneling device for opening endovascular occlusion includes a drill bit 1 with a flexible shaft drive, a propulsion tube 2, a first guide tube 3, a first support airbag 4, a second support airbag 5, a second guide tube 6, a flushing pump (or syringe flushing, etc., not shown in the figure), a negative pressure pump (or syringe aspiration, etc., not shown in the figure), a drug delivery pump (or syringe drug delivery, etc., not shown in the figure), a sensor 7, an air pump or pressurized water pump (or syringe adding saline, etc., not shown in the figure), a PC-based processing device (not shown in the figure), a cable 8, and a drive motor decelerator. The mechanism (not shown in the figure) includes sensor 7, which comprises an ultrasonic probe, a photosensitive CMOS or CCD probe, and an OCT probe (one or more sensors can be used; when using one or two sensors, the remaining fixed tubes are sealed with non-toxic rubber, etc.). The signal output terminals of the ultrasonic probe, photosensitive CMOS or CCD probe, and OCT probe 7 are connected to the signal input terminals of the processing equipment via data cables. The power input terminals of the flushing pump, negative pressure pump, drug delivery pump, sensor 7, air pump or pressurized water pump, and drive motor reduction mechanism are respectively connected to the multi-channel control power output source of the processing equipment via power input terminals. The upper end of the propulsion tube 2 is closed, and the lower end is open. A drill tube 21 of the same length as the propulsion tube is fixedly installed at the lower end of the upper middle part of the propulsion tube 2. The flexible shaft of the drill bit 1 rotates from top to bottom and is located inside the drill tube 21. The drill bit 1 is located outside the upper end of the propulsion tube 2. There is a limiting sleeve with an outer diameter larger than the inner diameter of the drill tube 21 (which guides the rotation of the flexible shaft) at the middle of the lower end of the drill bit 1, so that the lower end of the drill bit 1 and the upper end of the propulsion tube 2 are spaced apart. A liquid supply pipe 22 and a liquid suction pipe 23 are fixedly installed on both sides of the upper middle part of the propulsion pipe 2. A first traction pipe 24 with a length one-third of the propulsion pipe is installed around the upper middle part of the propulsion pipe 2. There are seven cables 8, of which the upper ends of four cables 8 are fixedly installed inside the upper ends of the four first traction pipes 24. The lower end of the propulsion pipe 2 and the upper end of the first guide pipe 3 are fixedly installed together. The inner side of the annular hollow first support airbag 4 is tightly fitted around the middle of the outer side of the first guide pipe 3. A first inflation pipe 41 is fixedly installed on the right side of the lower end of the first support airbag 4. The upper end of the second guide pipe 6 is closed and the lower end is open. There is an opening 61 on the right side of the middle part of the upper end of the second guide pipe 6. The opening of the second guide pipe 6 is sealed and fixedly installed on the outer side of the lower end of the first guide pipe 3. Three sensor fixing tubes 62 of the same length as the second guide tube 6 are fixedly installed on the lower left side of the upper end of the second guide tube 6. The outer sides of the ultrasonic probe 7, the photosensitive CMOS or CCD probe 7, and the OCT probe 7 are respectively sealed and fixedly installed inside the upper end of the three fixing tubes 62. The wires connected to the ultrasonic probe 7, the photosensitive CMOS or CCD probe 7, and the OCT probe 7 are led out downward through the lower end of the three fixing tubes 62.The lower part of the upper middle part of the second guide tube 6 is fixedly installed with spray tubes 63 of the same length as the second guide tube. Three second traction tubes 64 with a length of one-sixth of the second guide tube are installed around the second guide tube. The upper ends of the other three cables 8 are fixedly installed inside the upper ends of the three second traction tubes 64. The inner side of the annular hollow second support airbag 5 is tightly fitted on the upper part of the outer side of the second guide tube 6. A second inflation tube 51 is fixedly installed on the right side of the lower end of the second support airbag.

[0019] Figure 1 , 2 As shown in Figures 3 and 4, the lower parts of the flexible shaft of drill bit 1, the lower parts of the liquid supply pipe 22, the lower parts of the liquid suction pipe 23, the lower parts of the spray pipe 63, the lower parts of the seven cables 8, and the lower parts of the wires connected to the ultrasonic probe, photosensitive CMOS or CCD probe, and OCT probe are all located outside the lower end of the second guide tube 6. The first inflation pipe 41 is fixedly installed on the outside of the first guide tube 3 and the second guide tube 6 (the middle part is located on the right side inside the annular hollow part of the second support airbag 5), and the second inflation pipe 51 is fixedly installed on the outside of the second guide tube 6. The lower parts of the first inflation pipe 41 and the second inflation pipe 51 are located outside the lower end of the second guide tube 6. The core of the flexible shaft is made of stainless steel, and the flexible hose is made of polytetrafluoroethylene or high-density polyethylene. A rectangular hollow drive tube is installed on the front side of the shaft of the drive motor reduction mechanism, and the rectangular drive shaft at the lower end of the flexible shaft is fixedly installed inside the drive tube; the cables 8 are thin and soft stainless steel wire ropes. The lower parts of the infusion tube 22 and the suction tube 23 are respectively connected to the outlet of the drug delivery pump and the inlet of the negative pressure pump via a hose with a certain strength for sealing and fixing. The outlet of the drug delivery pump and the lower part of the spray tube 63 are also connected to the lower part of the spray tube with a certain strength for sealing and fixing. The lower parts of the first inflation tube 41 and the second inflation tube 51 are respectively connected to the air outlet of the air pump or the liquid outlet of the pressurized water pump via a valve connected in series and then connected in parallel via a hose with a certain strength for sealing and fixing. The outer diameter of the first support airbag 4 is smaller than the outer diameter of the second support airbag 5, the inner diameter of the inner ring of the first support airbag 4 is smaller than the outer diameter of the first guide tube 3, and the inner diameter of the inner ring of the second support airbag 5 is smaller than the outer diameter of the second guide tube 6. The first support airbag 4 and the second support airbag 5 are made of medical-grade silicone or latex. The first guide tube 3, the second guide tube 6, the first inflation tube 41, the second inflation tube 51, the spray tube 63, the first traction tube 24, the second traction tube 64, the fixation tube 62, the drug delivery tube 22, and the suction tube 23 are made of medical-grade polytetrafluoroethylene or high-density polyethylene (a flexible polymer material). The upper part of the propulsion tube 2 (rigid medical material), the upper part of the second guide tube 6, and the upper and lower outer sides of the first support airbag 4 and the second support airbag 5 are all rounded transition structures.

[0020] Figure 1 , 2As shown in Figures 3 and 4, the method of this invention for entering the human blood vessel is consistent with the prior art. After entering the blood vessel, an electrically powered air pump or pressurized water pump fills the first support bladder 4 or the second support bladder 5 with air or water. After the first support bladder 4 or the second support bladder 5 expands, it can provide intraluminal support and fixation within the blood vessel lumen (facilitating rotational ablation, etc.). The first support bladder has a small outer diameter and mainly expands the blood vessel lumen narrowed by the plaque at the front end. After deflation, it facilitates the advancement of the equipment within the lumen. The second support bladder has a large outer diameter and mainly fixes the equipment within the lumen. Specifically, after the first support bladder 4 or the second support bladder 5 is inflated with air or liquid, it can stabilize the entire equipment, ensure that the drill bit is in the central position within the blood vessel lumen, and block blood flow, reducing the risk of distal arterial embolism during the operation. Once the equipment enters the blood vessel, the surgeon can manually pull four of the cables 8 to deflect the advance tube 2 and drill bit 1 at a certain angle along the first guide tube 3, facilitating rotary grinding or the equipment's forward or backward movement within the blood vessel. The surgeon can further fine-tune the process by pulling the remaining cable 8, causing the first guide tube 3, advance tube 2, and drill bit 1 to deflect at a certain angle along the second guide tube, further facilitating rotary grinding or the equipment's forward or backward movement within the blood vessel. Specifically, the seven cables can adjust the angle at which the drill bit enters the blood vessel, guiding the working part (drill bit) to directionally contact the plaque, enabling operation without guidewire guidance and navigating through tortuous occluded arterial segments. When the motor reduction mechanism is energized, it drives the drill bit 1 to rotate via a flexible shaft, thereby rotary grinding the vascular plaque area. This avoids the force transmission loss and operational instability of traditional hand-driven drills, improving the controllability and efficiency of the vascular plaque excavation process. After sensor 7 is powered on, it transmits the collected signals to the PC-based processing device. The processing device processes the signals, and its display screen shows real-time images of the blood vessel. Doctors can perceive the spatial position of the instruments within the blood vessel lumen in real time, especially identifying the relative distance and position between the atherectomy head (drill) and the adventitia of the blood vessel, improving the intuitiveness and safety of the operation. After the infusion pump is powered on, it delivers saline or contrast fluid to the surgical site via tubing 22 (the outlets of the contrast fluid tank and the saline tank are connected in series via valves and in parallel to the infusion pump's inlet; the contrast fluid, combined with X-ray equipment, displays the intravascular structure). After the negative pressure pump is powered on, it aspirates plaque debris and other foreign objects from the surgical site through suction tubing 23, draining them outside the blood vessel, achieving good surgical results (the distance between the lower end of the drill and the upper end of the infusion tube ensures that contrast fluid or saline enters the blood vessel and that debris is drained from the body). After the drug delivery pump is powered on, it can apply drugs to the vascular wound to stop bleeding after the shield tunneling is completed and the plaque is cleared (by spraying drugs through the spray tube 63), reducing the chance of restenosis in the blood vessels.In summary, with the combined efforts of relevant mechanisms, this invention achieves precise three-dimensional positioning and controllable guidance within the vascular lumen, adapting to the arterial pathway and occlusion site. This results in efficient and safe directional tunneling and vascular recanalization, providing valuable technical support for the treatment of peripheral arterial atherosclerosis occlusion. It should be noted that the drill bit, flushing pump, negative pressure pump, drug delivery pump, sensor, air pump or pressurized water pump, PC-based processing equipment, cable, drive motor reduction mechanism, etc., used in this application are all mature technologies. This invention achieves its purpose by integrating existing technologies. Therefore, this application does not elaborate on the working principle of the aforementioned equipment, nor does it provide any separate protection for the aforementioned equipment.

[0021] Those skilled in the art should understand that although this specification describes embodiments, the embodiments do not necessarily contain only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art. Therefore, the scope of protection of this application is defined by the claims.

Claims

1. A tunnel boring machine (TBM) for opening endovascular occlusion, comprising a drill bit with a flexible shaft drive, a propulsion tube, a first guide tube, a first support airbag, a second support airbag, a second guide tube, a flushing pump, a negative pressure pump, a drug delivery pump, a sensor, an air pump, a PC-based processing device, cables, and a drive motor reduction mechanism; characterized in that, The upper and lower ends of the propulsion tube are fixedly installed with a drill bit tube, a liquid supply tube, a liquid suction tube, and multiple first traction tubes. The flexible shaft of the drill bit rotates inside the drill bit tube, and the drill bit is located outside the upper end of the propulsion tube. There are multiple cables, the upper ends of which are fixedly installed inside multiple first traction tubes. The lower end of the propulsion tube and the upper end of the first guide tube are fixedly installed together. The inner side of the first support airbag is fixedly installed outside the first guide tube, and the lower end of the first support airbag is fixedly installed with a first inflation tube. There is an opening on one side of the upper end of the second guide tube, and the lower outer side of the first guide tube is fixedly installed inside the opening of the second guide tube. The lower part of the other side of the upper end of the second guide tube is fixedly installed with a sensor fixing tube, a spraying tube, and multiple second traction tubes. The sensor is fixedly installed inside the sensor fixing tube, and the upper ends of multiple cables are fixedly installed inside multiple second traction tubes. The inner side of the second support airbag is fixedly installed outside the second guide tube, and the lower end of the second support airbag is fixedly installed with a second inflation tube.

2. The shield tunneling device for opening endovascular occlusion according to claim 1, characterized in that, The lower parts of the drill bit's flexible shaft, feed tube, suction tube, spray tube, and multiple cables, as well as the lower parts of the wires connected to the sensor, are located outside the lower end of the second guide tube.

3. A shield tunneling device for opening endovascular occlusion according to claim 1, characterized in that, The lower parts of the first inflation tube and the second inflation tube are located outside the lower end of the second guide tube, respectively.

4. A shield tunneling device for opening endovascular occlusion according to claim 1, characterized in that, The flexible shaft has a stainless steel core and a polytetrafluoroethylene (PTFE) hose. A special-shaped drive tube is installed on the front side of the shaft of the drive motor reduction mechanism. The lower end of the flexible shaft has a special-shaped drive shaft fixedly installed inside the drive tube. The cable is a thin and soft stainless steel wire rope.

5. A shield tunneling device for opening endovascular occlusion according to claim 1, characterized in that, The lower part of the infusion tube and the lower part of the suction tube are fixedly connected to the outlet end of the drug delivery pump and the inlet end of the negative pressure pump, respectively. The outlet end of the drug delivery pump is fixedly connected to the lower part of the spray tube. The lower parts of the first inflation tube and the second inflation tube are fixedly connected in parallel to the outlet end of the air pump, respectively.

6. A shield tunneling device for opening endovascular occlusion according to claim 1, characterized in that, The outer diameter of the first support airbag is smaller than the outer diameter of the second support airbag, the inner diameter of the inner ring of the first support airbag is smaller than the outer diameter of the first guide tube, and the inner diameter of the inner ring of the second support airbag is smaller than the outer diameter of the second guide tube.

7. A shield tunneling device for opening endovascular occlusion according to claim 1, characterized in that, The first and second support airbags are made of medical-grade silicone, while the first guide tube, second guide tube, first inflation tube, second inflation tube, spray tube, first traction tube, second traction tube, fixation tube, drug delivery tube, and suction tube are made of medical-grade polytetrafluoroethylene.

8. A shield tunneling device for opening endovascular occlusion according to claim 1, characterized in that, The upper part of the propulsion tube, the upper part of the second guide tube, and the outer sides of the upper and lower parts of the first and second support airbags are all arc transition structures.

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