A quantitative constant pressure perfusion chemotherapy dosing device for liver cancer arterial lesions

Abstract

The application relates to the technical field of medical equipment, and discloses a quantitative constant-pressure perfusion chemotherapy dosing device for liver cancer arterial lesions, which is characterized in that a limiting rod is used for slidingly guiding a top plate and a second clamping plate, a second clamping plate is matched with a needle cylinder flange, a pressure receiving capsule is matched with a medium linkage ratchet locking mechanism to realize axial limiting of the needle cylinder, concentrated stress at the plastic needle cylinder flange is effectively dispersed, flange bending, disengagement and axial movement of the needle cylinder under high-pressure perfusion are avoided, and the corresponding reference of the piston displacement and the liquid discharge amount is stably maintained throughout the process. Meanwhile, a hollow annular limiting structure is matched with a nested first stand and a second stand, coaxiality of different specifications of injectors can be ensured, different sizes of injectors in clinical use are adapted, and the compatibility is stronger; and the quantitative constant-pressure perfusion chemotherapy dosing device is suitable for the clinical use scene of long-time continuous perfusion chemotherapy for liver cancer arterial lesions.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a quantitative constant pressure perfusion chemotherapy drug delivery device for arterial lesions of liver cancer. Background Technology

[0002] Primary liver cancer is a malignant tumor with a high incidence and mortality rate in my country. Most patients are diagnosed at an advanced stage and do not meet the criteria for surgical resection.

[0003] Hepatic artery infusion chemotherapy (HAIC) is one of the core local treatment options for intermediate and advanced liver cancer. Based on the physiological characteristic that liver cancer lesions are mainly supplied by the hepatic artery, a microcatheter is superselectively placed into the hepatic artery branch that supplies blood to the tumor after percutaneous puncture of the artery, and chemotherapy drugs are continuously infused directly into the target lesion through the indwelling catheter.

[0004] This administration method can achieve local drug concentrations in tumors that are tens to hundreds of times higher than those achieved with systemic intravenous chemotherapy. While enhancing the tumor-killing effect, it significantly reduces systemic toxic side effects, providing an effective approach for conversion therapy and palliative treatment of unresectable liver cancer.

[0005] Currently, postoperative bedside hepatic artery perfusion chemotherapy is generally driven by conventional medical infusion pumps. Conventional medical infusion pumps are constant-speed drug delivery devices developed for low-pressure intravenous infusion scenarios. They use a stepper motor and transmission mechanism to drive the syringe plunger forward at a constant speed, and the output flow rate is controlled by the plunger displacement rate. Due to their ease of operation and versatility, they are widely used in various clinical intravenous infusion scenarios.

[0006] However, the above-mentioned and existing related technologies often have the following drawbacks: Existing medical infusion pumps place the syringe flange in a semi-circular arc groove on its surface to avoid axial horizontal movement of the syringe due to the push rod force during continuous infusion, and ensure a stable correspondence between the piston advance displacement and the volume of drug discharged from the syringe, thus using this as the structural benchmark for drug delivery volume measurement.

[0007] However, clinical syringes come in various sizes, and the flange dimensions of different syringe sizes vary significantly, resulting in inconsistent actual contact areas with the semi-circular groove. Furthermore, syringes are generally injection molded from rigid plastics such as polypropylene. Therefore, when encountering situations with a small contact area, under the continuous high-pressure load of hepatic artery perfusion, the localized stress concentration area of ​​the syringe flange is prone to bending. This can lead to axial displacement of the entire syringe, or even the flange dislodging from the groove and losing axial restraint, directly interrupting the perfusion treatment process. Summary of the Invention

[0008] The technical problem to be solved by the present invention is that existing medical infusion pumps have the disadvantages of poor compatibility between the syringe flange and the fixing slot, and difficulty in ensuring the accuracy, continuity and safety of perfusion therapy under continuous high pressure load. To this end, we propose a quantitative constant pressure perfusion chemotherapy drug delivery device for arterial lesions of liver cancer.

[0009] To achieve the above objectives, this application adopts the following technical solution: a quantitative constant pressure perfusion chemotherapy drug delivery device for arterial lesions of liver cancer, including a base and a syringe placement seat fixedly installed on one side above it, a syringe pressure plate is provided above the syringe placement seat, and a first bolt threadedly connected to the syringe placement seat is provided on the inner side of the syringe pressure plate. A pressure-receiving bladder is symmetrically embedded on the surface of the syringe holder, and the surface of the pressure-receiving bladder is higher than the surface of the syringe holder. A connecting tube is fixedly installed at the lower end of the pressure-receiving bladder. A push rod is slidably sleeved on the inner side of the other end of the connecting tube. A first ratchet is fixedly installed at the end of the push rod away from the connecting tube. An outer disc is sleeved on the outer side of the push rod. A torsion spring is fixedly installed on the side of the two sets of outer discs that are close to each other. A winch is fixedly installed at the other end of the torsion spring. A second ratchet is fixedly installed on both sides of the winch. A winch rope is wound around the outer side of the winch. The other end of the winch rope is connected to an inner rod. An outer cylinder fixedly connected to the base is slidably sleeved on the outer side of the inner rod. A spring fixedly connected to the base is sleeved on the outer side of the outer cylinder. A first column is fixedly installed at the same end of the spring and the inner rod. A limit structure is provided above the first column. The pressure-receiving bladder and the connecting tube are internally connected and filled with a medium.

[0010] Preferably, the limiting structure is a hollow annular circle.

[0011] Preferably, a second column is fixedly installed on the outer side of the limiting structure, and the second column is slidably sleeved on the inner side of the first column.

[0012] Preferably, the outer disc is slidably sleeved on the outside of the push rod, the outer disc is fixedly connected to the base, and the winch is located on the inside of the base and rotatably connected.

[0013] Preferably, a sealing ring is fixedly sleeved on the outer side of the push rod, and the sealing ring is tightly fitted to the inner wall of the connecting pipe.

[0014] Preferably, a base plate is fixedly installed on the other side above the base, a servo motor is fixedly installed inside the base plate, and a lead screw is fixedly installed on the drive end of the servo motor. The other end of the lead screw is rotatably connected to the syringe holder. A top plate is slidably arranged above the base, and the top plate is threaded onto the outside of the lead screw.

[0015] Preferably, a first clamping plate is slidably disposed on the outer side of the top plate, a first sliding groove is formed through the surface of the first clamping plate, and a second bolt is threaded onto the outer side of the top plate, the second bolt being located in the first sliding groove.

[0016] Preferably, a sliding rod is symmetrically fixedly installed on one side of the first clamping plate, and the sliding rod is slidably disposed on the inner side of the top plate.

[0017] Preferably, a second clamping plate is slidably provided on the outer side of the syringe holder, and a second sliding groove is symmetrically opened through the surface of the second clamping plate. A third bolt is symmetrically threaded on the outer side of the syringe holder, and the third bolt is located in the second sliding groove.

[0018] Preferably, a limiting rod is symmetrically fixedly installed on one side of the syringe holder and the base plate that are close to each other, and the top plate and the second clamping plate are slidably sleeved on the outside of the limiting rod.

[0019] The technical advantages of this invention are as follows: A limiting rod guides the top plate and the second clamping plate in a sliding manner. The adjustable second clamping plate holds the syringe flange, and the pressure bladder, along with a media-linked ratchet locking mechanism, achieves axial positioning of the syringe. Simultaneously, the hollow annular limiting structure, combined with nested first and second columns, ensures coaxiality of syringes of different sizes. The entire mechanism can adapt to various syringe sizes, effectively dispersing concentrated stress at the plastic syringe flange, preventing flange bending or detachment under high-pressure infusion, and avoiding axial movement of the syringe. It maintains a stable correlation between piston displacement and drug output throughout the entire process.

[0020] Advantages of this invention: It overcomes the limitations of traditional injection pumps with a single fixed semi-circular arc groove. The multi-dimensional clamping, flexible media locking, dual-elastic automatic reset, and servo-precision injection structures work together to adapt to various sizes of syringes used in clinical settings, resulting in greater compatibility. By relying on the collaborative sharing of high-pressure loads by multiple structures, it significantly reduces the risk of fatigue cracking and slippage of the polypropylene syringe flange, thus interrupting treatment and improving operational stability under continuous high-pressure conditions in the hepatic artery. Furthermore, the mechanism automatically resets after syringe disassembly, eliminating the need for manual resetting of components, simplifying bedside fluid exchange procedures and reducing the probability of operational errors. It is suitable for clinical applications involving long-term continuous perfusion chemotherapy for hepatocellular carcinoma arterial lesions. Attached Figure Description

[0021] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts: Figure 1 This is a top view of the overall unused structure of the present invention; Figure 2 This is a top view of the overall structure of the present invention; Figure 3 This is a top view of the overall structure of the present invention after the base has been removed; Figure 4 This is a bottom view of the overall structure of the present invention after the base has been removed; Figure 5This is an exploded view of the syringe holder and top plate structure of the present invention; Figure 6 This is an exploded and cross-sectional schematic diagram of the connecting pipe, push rod, outer disc, and torsion spring structure of the present invention; Figure 7 For the present invention Figure 6 Enlarged schematic diagram of the structure at point A in the middle; Figure 8 This is a schematic plan view of the internal structure of the base of the present invention.

[0022] Legend: 1. Base; 2. Base plate; 3. Syringe holder; 31. Syringe pressure plate; 32. First bolt; 33. Second clamping plate; 34. Second slide groove; 35. Third bolt; 4. Top plate; 41. First clamping plate; 42. Slide rod; 43. First slide groove; 44. Second bolt; 5. Lead screw; 6. Limiting rod; 7. Pressure bladder; 71. Connecting tube; 72. Push rod; 73. First ratchet; 74. Outer disc; 75. Torsion spring; 76. Winch; 77. Second ratchet; 78. Winding rope; 79. Inner rod; 8. Outer cylinder; 9. Spring; 91. First column; 92. Limiting structure; 93. Second column. Detailed Implementation

[0023] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0024] According to one embodiment of the present invention, Figures 1 to 8 As shown.

[0025] Existing medical infusion pumps place the syringe flange in a semi-circular groove on its surface to prevent the syringe from moving horizontally axially due to the thrust of the push rod 72 during continuous infusion. This ensures a stable correspondence between the piston's advance displacement and the volume of drug discharged from the syringe, serving as a structural reference for drug delivery volume measurement.

[0026] However, clinically used syringes come in various specifications, and the flange dimensions of different syringe sizes vary significantly, resulting in inconsistent actual contact areas with the semi-circular groove. Furthermore, syringes are generally injection molded from rigid plastics such as polypropylene. Therefore, when encountering situations with a small contact area, under the continuous high-pressure load of hepatic artery perfusion, the local stress concentration area of ​​the syringe flange is prone to bending. This can lead to axial displacement of the entire syringe, or even the flange dislodging from the groove and losing axial restraint, directly interrupting the perfusion treatment process. To address this problem, this invention incorporates the following design in a quantitative constant-pressure perfusion chemotherapy drug delivery device for hepatocellular carcinoma arterial lesions: A quantitative constant pressure perfusion chemotherapy drug delivery device for arterial lesions of liver cancer includes a base 1 and a syringe placement seat 3 fixedly installed on one side above it. A syringe pressure plate 31 is provided above the syringe placement seat 3, and a first bolt 32 threadedly connected to the syringe placement seat 3 is provided on the inner side of the syringe pressure plate 31. A pressure-receiving bladder 7 is symmetrically embedded on the surface of the syringe holder 3, and the surface of the pressure-receiving bladder 7 is higher than the surface of the syringe holder 3. A connecting tube 71 is fixedly installed at the lower end of the pressure-receiving bladder 7. A push rod 72 is slidably sleeved on the inner side of the other end of the connecting tube 71. A first ratchet 73 is fixedly installed at the end of the push rod 72 away from the connecting tube 71. An outer disc 74 is sleeved on the outer side of the push rod 72. A torsion spring 75 is fixedly installed on the side of the two sets of outer discs 74 that are close to each other. A winch 76 is fixedly installed at the other end of the torsion spring 75. A second ratchet 77 is fixedly installed on both sides of the winch 76. A winch rope 78 is wound around the outside of the winch 76. The other end of the winch rope 78 is connected to an inner rod 79. An outer cylinder 8, which is fixedly connected to the base 1, is slidably sleeved on the outside of the inner rod 79. A spring 9, which is fixedly connected to the base 1, is sleeved on the outside of the outer cylinder 8. A first column 91 is fixedly installed at the same end of the spring 9 and the inner rod 79. A limit structure 92 is provided above the first column 91. The pressure bladder 7 and the connecting tube 71 are internally connected and filled with a medium.

[0027] When using this device, first lift the syringe pressure plate 31 by tightening the first bolt 32, then insert the syringe needle into the inside of the limiting structure 92 so that the end of the syringe barrel abuts against the limiting structure 92. At this time, you can push the limiting structure 92 by holding the syringe barrel, so that the limiting structure 92 drives the first column 91 to gradually stretch the spring 9. At the same time, the first column 91 will also drive the inner rod 79 to gradually extend out of the outer cylinder 8 and pull one end of the winch 78 simultaneously, causing the winch 76 to rotate and unwind until the syringe flange abuts against one side of the syringe placement seat 3.

[0028] At this point, the syringe pressure plate 31 can be gradually lowered by rotating the first bolt 32 in the opposite direction until the outer wall of the syringe barrel is flush with the surface of the syringe holder 3.

[0029] During this process, the outer wall of the syringe presses against the pressure bladder 7 embedded in the surface of the syringe holder 3, forcing the liquid medium inside the pressure bladder 7 to transfer into the connecting tube 71. As the liquid medium increases in the connecting tube 71, it pushes the push rod 72 to gradually extend out of the inner side of the connecting tube 71 until the first ratchet 73 at one end of the push rod 72 abuts against the second ratchet 77 on both sides of the winch 76. At this point, the winch 76 can no longer rotate and unwind the rope 78. The rope 78 then pulls and limits the inner rod 79, thus axially locking it from the syringe end near the needle during subsequent continuous infusion. This design effectively avoids the risks of flange bending and cracking caused by insufficient force-bearing area and stress concentration in traditional semi-circular arc grooves and flanges of different specifications. It can stably offset the continuous squeezing pressure during infusion, prevent the syringe from shifting axially and the flange from coming out of the groove, and firmly maintain the measurement benchmark of piston advance displacement and drug discharge volume, thereby improving the dosage accuracy and treatment continuity of long-term infusion. At the same time, the entire locking action is completed synchronously with the syringe fixation, without the need for additional manual adjustment or reinforcement, which is suitable for the use of frequent bedside fluid changes and tubing maintenance in clinical settings. Both the ease of operation and treatment safety are significantly improved.

[0030] Once the infusion is complete, the syringe pressure plate 31 can be lifted by tightening the first bolt 32 again, and the empty syringe can be removed. At this time, the pressure bladder 7 will be released from the pressure of the syringe, and as its elasticity gradually recovers, it will draw the liquid medium in the connecting tube 71, thereby causing the push rod 72 to drive the first ratchet 73 to gradually move away from the second ratchet 77 until it returns to the initial position.

[0031] Because the winch 76, during its rotation and unwinding process, simultaneously drives the torsion spring 75 to store torsional energy, and the spring 9 generates restoring potential energy when stretched, the winch 76 will rotate in the opposite direction and wind up the rope 78, thereby pulling the inner rod 79, the first column 91, and the limiting structure 92. Simultaneously, the spring 9 will pull the inner rod 79, the first column 91, and the limiting structure 92, thus achieving rapid repositioning and preparing for the next pouring operation.

[0032] By relying on the elastic rebound characteristics of the pressure bladder 7 to achieve automatic release of the lock, and with the dual elastic reset power source composed of torsion spring 75 and spring 9, after the syringe pressure plate 31 is lifted and the syringe compression is removed, the transmission medium in the return connecting tube 71 is automatically aspirated by the pressure bladder 7, which drives the push rod 72 and the first ratchet 73 to retract synchronously and disengage from the second ratchet 77, without the need for additional manual unlocking steps; at the same time, the torsional reset force of torsion spring 75 and the axial tension of spring 9 form a synergistic drive, driving the inner rod 79, the first column 91 and the limiting structure 92 to return to their positions quickly and smoothly. This can effectively avoid fatigue failure and reset jamming problems caused by long-term alternating loads of a single elastic element, improve the reliability and service life of the mechanism, and the entire reset action is completed synchronously with the disassembly of the syringe, without the need for additional manual operation. It is suitable for clinical scenarios with frequent fluid changes in long-term hepatic artery perfusion treatment, which can effectively reduce the workload of bedside medical staff and reduce the risk of treatment interruption due to operational errors.

[0033] Furthermore, by setting the limiting structure 92 as a hollow annular circle, and fixing a second column 93 on the outside of the limiting structure 92, with the second column 93 slidably sleeved inside the first column 91, the limiting structure 92 adopts a hollow annular design, combined with the guide structure of the second column 93 slidingly nested inside the first column 91, and the radial alignment is automatically completed by the contact between the tapered surface of the syringe end and the end face of the annular circle; while the nested sliding column structure ensures that the limiting structure 92 can move radially and always remain coaxial with the main injection axis; this design can adapt to syringes of different diameters and different taper specifications, ensuring that the syringe and the axial limiting force are always on the same axis after installation, improving the compatibility of multiple syringe models, and further ensuring the accuracy of drug delivery and the stability of the tubing pathway under long-term hepatic artery perfusion.

[0034] In addition, by sliding the outer disc 74 onto the outside of the push rod 72 and fixing the outer disc 74 to the base 1, and with the winch 76 located inside the base 1 and rotatably connected, this layout provides reliable radial guidance for the axial extension and retraction of the push rod 72 through the fixed outer disc 74, ensuring that the first ratchet 73 always moves in a straight line and is precisely aligned and engaged with the second ratchet 77, avoiding skewness and jamming during reciprocating motion, and maintaining stable and reliable locking action even under continuous high-pressure load of hepatic artery perfusion; on the other hand, by internally mounting the winch 76 inside the base 1, the rotational support of the winch 76 is made more stable, and there is no radial wobbling during the torsion energy storage and release process of the torsion spring 75, reducing the overall space occupied by the mechanism, and effectively extending the service life of the entire locking and reset mechanism, adapting to the clinical needs of long-term and high-frequency use.

[0035] Secondly, a sealing ring is fixedly sleeved on the outside of the push rod 72, and the sealing ring is tightly fitted to the inner wall of the connecting tube 71. This tight fit between the sealing ring fixedly sleeved on the outside of the push rod 72 and the inner wall of the connecting tube 71 effectively seals the transmission medium within the chamber, preventing leakage during the pressure transmission process of the pressure-bearing bladder 7. This ensures the stability and consistency of hydraulic pressure transmission, and provides sufficient and reliable locking force between the first ratchet 73 and the second ratchet 77 to withstand the continuous high pressure from hepatic artery perfusion. This eliminates the problem of locking force attenuation and axial movement of the syringe caused by medium leakage.

[0036] In this application, a base plate 2 is fixedly installed on the other side above the base 1. A servo motor is fixedly installed inside the base plate 2, and a lead screw 5 is fixedly installed on the drive end of the servo motor. The other end of the lead screw 5 is rotatably connected to the syringe placement seat 3. A top plate 4 is slidably arranged above the base 1. The top plate 4 is threadedly sleeved on the outside of the lead screw 5. A first clamping plate 41 is slidably arranged on the outside of the top plate 4. A first sliding groove 43 is opened through the surface of the first clamping plate 41. A second bolt 44 is threadedly screwed on the outside of the top plate 4. The second bolt 44 is located in the first sliding groove 43. A sliding rod 42 is symmetrically fixedly installed on one side of the first clamping plate 41. The sliding rod 42 is slidably arranged on the inside of the top plate 4.

[0037] The lead screw 5 connected to the drive end drives the threaded top plate 4 to move smoothly back and forth along the axial direction. At the same time, the first clamping plate 41 set on the outer side of the top plate 4 can be adjusted in position along the first sliding groove 43 and the sliding rod 42, and is locked and fixed by the second bolt 44. It can flexibly adapt to the push plate size of different syringes and form a reliable clamping. The injection mechanism adopts a combination of servo motor and lead screw 5 transmission, which can accurately control the piston advancement rate and drug volume, matching the high precision requirements of hepatic artery perfusion chemotherapy for quantitative constant pressure drug delivery. At the same time, the adjustable clamping can adaptively fix with the front syringe to form a full-size adaptation, effectively avoiding push plate slippage and deflection, and firmly maintaining the measurement benchmark of piston advancement displacement and drug discharge volume, further ensuring drug delivery accuracy and operational reliability during long-term perfusion.

[0038] A second clamping plate 33 is slidably disposed on the outside of the syringe holder 3. A second sliding groove 34 is symmetrically opened through the surface of the second clamping plate 33. A third bolt 35 is symmetrically threaded on the outside of the syringe holder 3. The third bolt 35 is located in the second sliding groove 34, so that the second clamping plate 33 can be slidably adjusted along the second sliding groove 34 and locked and positioned by the third bolt 35. The clamping distance can be flexibly adjusted for different specifications of syringe flanges, forming a stable surface clamping constraint from both sides of the flange. This breaks the limitation of the traditional fixed semi-circular arc groove on the flange size adaptation, is compatible with more commonly used clinical syringe models, and can also effectively increase the force-bearing contact area of ​​the flange, disperse the concentrated stress at the corner where the flange and the cylinder are connected, reduce the failure risk of plastic flange bending and cracking under load, further eliminate the hidden dangers of axial translation of the syringe and flange dislodging from the groove during the infusion process, and continuously ensure the accuracy of the piston propulsion measurement reference and the continuity of long-term treatment.

[0039] Limiting rods 6 are symmetrically fixedly installed on one side of the syringe holder 3 and the base plate 2, which are close to each other. The top plate 4 and the second clamping plate 33 are slidably sleeved on the outside of the limiting rods 6. This can provide stable axial sliding guidance for both the top plate 4 and the second clamping plate 33, strictly constrain their movement trajectory, and prevent the top plate 4 from radially swaying during the transmission with the screw 5. This ensures that the piston push axis and the syringe axis always remain highly coaxial, reducing the dosage deviation caused by piston wear and thrust loss. At the same time, it also allows the second clamping plate 33 to move smoothly and be accurately aligned when adjusting the flange clamping distance, ensuring that the clamping force on the syringe flange is uniform and symmetrical.

[0040] Furthermore, the symmetrically arranged double-bar structure can improve the overall load-bearing rigidity of the frame and extend the service life of the equipment.

[0041] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A device for quantitative constant-pressure perfusion chemotherapy administration to arterial lesions of liver cancer, characterized in that: The device includes a base and a syringe holder fixedly installed on one side above it. A syringe pressure plate is provided above the syringe holder, and a first bolt that is threadedly connected to the syringe holder is provided on the inner side of the syringe pressure plate. The syringe holder has symmetrically embedded pressure bladders on its surface, with the surface of the pressure bladders higher than the surface of the syringe holder. A connecting tube is fixedly installed at the lower end of the pressure bladder, and a push rod is slidably sleeved on the inner side of the other end of the connecting tube. A first ratchet is fixedly installed at the end of the push rod away from the connecting tube, and an outer disc is sleeved on the outer side of the push rod. A torsion spring is fixedly installed on the side of the two sets of outer discs that are close to each other. A winch is fixedly installed at the other end of the torsion spring, and a second ratchet is fixedly installed on both sides of the winch. A winch rope is wound around the outer side of the winch, and the other end of the winch rope is connected to an inner rod. An outer cylinder fixedly connected to the base is slidably sleeved on the outer side of the inner rod, and a spring fixedly connected to the base is sleeved on the outer side of the outer cylinder. A first column is fixedly installed at the same end of the spring and the inner rod, and a limit structure is provided above the first column. The pressure bladder and the connecting tube are internally connected and filled with a medium.

2. The quantitative constant-pressure perfusion chemotherapy drug delivery device for arterial lesions of liver cancer according to claim 1, characterized in that: The limiting structure is a hollow annular circle.

3. The quantitative constant pressure perfusion chemotherapy drug delivery device for arterial lesions of liver cancer according to claim 2, characterized in that: A second column is fixedly installed on the outer side of the limiting structure, and the second column is slidably sleeved on the inner side of the first column.

4. The quantitative constant pressure perfusion chemotherapy drug delivery device for arterial lesions of liver cancer according to claim 1, characterized in that: The outer disc is slidably sleeved on the outside of the push rod, and the outer disc is fixedly connected to the base. The winch is located on the inside of the base and is rotatably connected.

5. The quantitative constant pressure perfusion chemotherapy drug delivery device for arterial lesions of liver cancer according to claim 4, characterized in that: A sealing ring is fixedly sleeved on the outer side of the push rod, and the sealing ring is tightly fitted to the inner wall of the connecting pipe.

6. The quantitative constant pressure perfusion chemotherapy drug delivery device for arterial lesions of liver cancer according to claim 1, characterized in that: A base plate is fixedly installed on the other side above the base. A servo motor is fixedly installed inside the base plate, and a lead screw is fixedly installed on the drive end of the servo motor. The other end of the lead screw is rotatably connected to the syringe holder. A top plate is slidably arranged above the base, and the top plate is threaded onto the outside of the lead screw.

7. The quantitative constant pressure perfusion chemotherapy drug delivery device for arterial lesions of liver cancer according to claim 6, characterized in that: A first clamping plate is slidably disposed on the outer side of the top plate, and a first sliding groove is formed through the surface of the first clamping plate. A second bolt is threaded onto the outer side of the top plate, and the second bolt is located in the first sliding groove.

8. The quantitative constant pressure perfusion chemotherapy drug delivery device for arterial lesions of liver cancer according to claim 7, characterized in that: A sliding rod is symmetrically fixedly installed on one side of the first clamping plate, and the sliding rod is slidably disposed on the inner side of the top plate.

9. The quantitative constant pressure perfusion chemotherapy drug delivery device for arterial lesions of liver cancer according to claim 6, characterized in that: A second clamping plate is slidably disposed on the outer side of the syringe holder. A second sliding groove is symmetrically opened through the surface of the second clamping plate. A third bolt is symmetrically threaded on the outer side of the syringe holder. The third bolt is located in the second sliding groove.

10. The quantitative constant pressure perfusion chemotherapy drug delivery device for arterial lesions of liver cancer according to claim 9, characterized in that: Limiting rods are symmetrically fixedly installed on one side of the syringe holder and the base plate that are close to each other, and the top plate and the second clamping plate are slidably sleeved on the outside of the limiting rods.

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