A device for hepatic artery angiography in interventional treatment of liver cancer

Abstract

This invention relates to the field of medical device technology, specifically to an auxiliary device for hepatic artery angiography in interventional treatment of liver cancer. The device includes a fixed carrier with a flexible base and several supporting components. Each supporting component includes several arc-shaped connecting strips hinged together. Several adjustment boxes are installed on both sides of the flexible base, each containing an adjustment component. Each adjustment component includes a drive element with a bidirectional lead screw fixed to it. Nut seats are threaded to both ends of the bidirectional lead screw, and sliders are fixed to the nut seats. Traction cables are fixedly connected to the sliders, and the traction cables are hinged to the nodes of the arc-shaped connecting strips. The drive element is signal-connected to a control module. The control module controls the drive element to rotate the bidirectional lead screw forward and backward according to preset patient body shape parameters. This causes the sliders to slide through the nut seats, thereby causing the traction cables to pull the nodes of the arc-shaped connecting strips. This invention achieves multi-dimensional safety protection through mechanical structure linkage and sensor feedback, reducing surgical field interference.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to an auxiliary device for hepatic artery angiography in interventional treatment of liver cancer. Background Technology

[0002] Interventional therapy for liver cancer is one of the core methods for treating advanced liver cancer in clinical practice. Hepatic artery angiography, as a crucial pre-treatment step, involves injecting contrast agent into the hepatic artery through a catheter to clearly visualize the vascular morphology, lesion location, and blood supply, providing precise guidance for subsequent chemotherapy drug infusion and embolization therapy. Hepatic artery angiography auxiliary equipment, as a core tool for catheter positioning and support during the procedure, directly affects angiographic accuracy, surgical efficiency, and patient prognosis due to its compatibility, functional integrity, and safety.

[0003] However, existing hepatic artery angiography-assisted devices have many technical shortcomings and are difficult to meet complex clinical needs: First, they have poor patient fit. Most existing devices use standardized fixation stents or simple flexible bandage designs, which cannot conform to the irregular abdominal contours of patients with cirrhosis caused by organ displacement, ascites, etc. They are prone to displacement due to slight changes in body position, which in turn affects the stability of catheter positioning. At the same time, they can only adapt to some body shape differences by changing different lengths of bandages. They lack targeted adaptation structures for children (small body size, thin abdominal tissue) and obese patients (thick abdominal fat layer, difficult to position on the body surface). After the catheter is fixed, it is easy to shake, which increases the risk of vascular puncture injury. Secondly, the integration of functions is low. Existing equipment only has a single function of catheter support. Heating of contrast agent requires an external water bath heating device, and dosage control needs to be completed through an independent infusion pump. The connection of multiple devices and pipelines not only occupies surgical field space and increases the risk of instrument interference, but may also lead to contrast agent leakage due to poor sealing of the interface. In addition, there is no adaptable structure for emergency treatment of intraoperative bleeding. In case of sudden bleeding, the original support structure needs to be disassembled and hemostatic instruments replaced, which prolongs the rescue response time.

[0004] Therefore, we need to develop a hepatic artery angiography-assisted device for interventional treatment of liver cancer to address the aforementioned technical deficiencies. Summary of the Invention

[0005] To address the aforementioned issues, this invention provides a hepatic artery angiography-assisted device for interventional treatment of liver cancer. This device enables precise fitting of patients with different body types and pathological conditions, simultaneously completing catheter stabilization, contrast agent heating, and precise dosage control. Through mechanical structure linkage and sensor feedback, it achieves multi-dimensional safety protection, reduces surgical field interference, improves surgical efficiency and safety, and lowers the risk of intraoperative complications for patients.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: A hepatic artery angiography auxiliary device for interventional treatment of liver cancer includes a fixed carrier for conforming to the abdomen of a patient. The fixed carrier is provided with a flexible base for adapting to different abdominal contours of patients and achieving flexible conformation, and a number of support components for providing rigid support and adjusting deformation. The flexible base is provided with an installation space inside, and the support components are installed in the installation space. The support components include a number of arc-shaped connecting strips, which are hinged to each other to form a mesh structure that can deform in multiple directions.

[0007] Several adjustment boxes are installed on both sides of the flexible substrate. Each adjustment box contains an adjustment component for driving the deformation of the arc-shaped connecting strip. The adjustment component includes a driving component. A bidirectional lead screw is coaxially fixedly connected to the output shaft of the driving component. Nut seats are threaded to both ends of the bidirectional lead screw. A slider is fixedly connected to the nut seat. A traction steel cable is fixedly connected to the slider. The traction steel cable passes through the adjustment box and the flexible substrate and is hinged to the node of the arc-shaped connecting strip.

[0008] The drive unit is connected to a control module. The control module controls the drive unit to drive the bidirectional lead screw to rotate forward and backward according to the preset patient body shape parameters. The screw slides through the nut seat, which in turn pulls the steel cable to move the node displacement of the arc-shaped connecting strip, causing the arc-shaped connecting strip of the mesh structure to undergo multi-directional deformation.

[0009] Furthermore, a catheter positioning groove is provided on the side of the flexible base facing the patient's abdomen. An elastic buffer layer is provided on the inner wall of the catheter positioning groove. A clamping plate that can be adjusted laterally is provided on one side of the catheter positioning groove. An adjusting screw is fixedly connected to one side of the clamping plate. The adjusting screw is threadedly connected to the side wall of the flexible base. The adjusting screw extends to the outside of the flexible base and is fixed with an adjusting knob.

[0010] Furthermore, a main contrast agent delivery channel is formed inside the flexible substrate. The input end of the main contrast agent delivery channel extends to the edge of the flexible substrate and is equipped with a quick connector. A branch channel is provided at the bottom of the catheter positioning groove. The output end of the main contrast agent delivery channel is connected to the branch channel. The outlet of the branch channel is equipped with a sealing interface adapted to the contrast catheter. A graphene heating sleeve is provided inside the main contrast agent delivery channel. A temperature sensor is provided on the inner wall of the graphene heating sleeve. The temperature sensor is connected to the control module. The control module adjusts the heating power of the graphene heating sleeve according to the data detected by the temperature sensor.

[0011] Furthermore, a metering valve is installed near the quick connector in the main contrast agent delivery channel. The metering valve includes a valve seat, a valve core, and a drive gear set. The valve core is rotatably installed inside the valve seat. The side wall of the valve core has a flow regulating hole. The drive gear set includes a driven gear fixedly connected to the valve core on the same axis and a driving gear fixedly connected to the adjusting screw on the same axis. The driving gear meshes with the driven gear. When the adjusting screw rotates, it drives the driving gear to mesh with the driven gear and rotate, thereby driving the valve core to rotate. The opening and closing degree of the flow regulating hole controls the amount of contrast agent delivered.

[0012] Furthermore, the flexible base is equipped with foldable emergency hemostasis mechanisms on both sides corresponding to the catheter positioning groove. The emergency hemostasis mechanism includes a blood pressure plate hinged to the flexible base via elastic hinges. A medical hemostatic pad is provided on the inner side of the blood pressure plate. A locking component is provided inside the flexible base. The locking component includes an electromagnetic lock and a latch adapted to the electromagnetic lock. The latch is fixed to the free end of the blood pressure plate. The electromagnetic lock is signal-connected to the control module. When bleeding occurs during the operation, the control module controls the electromagnetic lock to unlock, and the blood pressure plate flips over to the top of the catheter positioning groove under the restoring force of the elastic hinge.

[0013] Furthermore, a first pressure sensor is provided on the inner side of the clamping plate. The first pressure sensor is connected to the control module. When the first pressure sensor detects that the catheter clamping pressure is lower than the preset first pressure threshold, the control module issues a warning message to prompt medical staff to rotate the adjustment knob until the pressure reaches the first pressure threshold.

[0014] Furthermore, an early warning module is included, comprising a tactile sensor, a capacitive leakage sensor, and an audible and visual alarm. All three are connected to the control module. The tactile sensor array is fixedly connected to the flexible substrate on the side of the patient's abdomen. The capacitive leakage sensor is installed at the sealing interface of the catheter positioning groove, and the audible and visual alarm is installed on top of the flexible substrate. The tactile sensor detects the pressure distribution on the patient's abdominal liver region. The control module compares the detected data with a preset normal hepatic artery surface projection pressure threshold. When the pressure distribution is abnormal, it is judged as a risk of vascular variation, and the audible and visual alarm issues a first-class warning. The capacitive leakage sensor detects contrast agent leakage. When the detected capacitance value change exceeds the change threshold, it is judged as leakage, and the audible and visual alarm issues a second-class warning.

[0015] Furthermore, the blood pressure relief plate is equipped with a second pressure sensor, which is connected to the control module. When the control module determines that the pressing pressure exceeds the second pressure threshold, the audible and visual alarm issues a third type of warning to alert medical staff.

[0016] Furthermore, the tactile sensor and the support assembly work together. When an abnormal pressure distribution on the body surface is detected, the control module drives the drive component in the corresponding adjustment box to work according to the position signal of the abnormal pressure area, and pulls the arc-shaped connecting strip node displacement by traction steel cable.

[0017] Furthermore, the edge of the flexible substrate is provided with a fixing strap, the free end of which is provided with Velcro. A tension sensor is embedded inside the fixing strap. The tension sensor is connected to the control module. The control module adjusts the working state of the drive component according to the data detected by the tension sensor, thereby matching the bonding pressure of the flexible substrate with the binding tension of the fixing strap.

[0018] The above approach has the following beneficial effects:

[0019] 1. This solution achieves precise adaptation to patients with different body types and pathological conditions through the design of a flexible base, a mesh deformable support component, and adaptive linkage of the strap tension. Compared with the traditional technology where standardized fixation stents cannot fit the irregular abdominal contours of cirrhotic patients and can only adapt to some body shape differences by simply changing the straps, this device can drive the arc-shaped connecting strip to deform in multiple directions through traction steel cable. At the same time, combined with the linkage adjustment of tension sensor and drive component, the fit between the flexible base and the abdominal contour is improved, effectively avoiding device displacement caused by changes in body position during operation. The stability of catheter fixation is significantly enhanced, and the adaptation coverage of children, obese patients, and patients with abdominal deformities due to cirrhosis is significantly improved.

[0020] 2. This solution achieves integrated control of catheter clamping and contrast agent flow regulation through the mechanical linkage of the adjusting screw and the drive gear set. Compared with the traditional technology where catheter fixation and flow control require the operation of two separate sets of equipment and the flow rate requires medical staff to manually match the catheter specifications based on experience, this device is driven by a single adjusting knob, so that the clamping force and flow rate are automatically matched. The larger the catheter diameter, the stronger the clamping force and the flow rate increase simultaneously. The accuracy is improved compared with the traditional method, while reducing surgical field interference caused by external flow control equipment and simplifying the surgical procedure.

[0021] 3. This solution integrates a foldable emergency hemostasis mechanism and contrast agent heating function. Emergency hemostasis does not require disassembly of the catheter fixation structure. Compared with the traditional technology that only has a single catheter support function, requires additional connection to external heating equipment, and requires disassembly of the stent to replace the hemostasis device when bleeding occurs, this device stabilizes the temperature of the contrast agent through a graphene heating sleeve, avoiding vasospasm caused by low temperature. At the same time, the emergency hemostasis mechanism can be quickly deployed to cover the bleeding point in a short time, shortening the rescue response time, reducing the space occupied in the surgical field, and reducing the secondary risk of intraoperative bleeding.

[0022] 4. This solution achieves accurate warning of vascular variations through mechanical linkage between tactile sensors and support components. Compared with traditional technologies that rely on the experience of medical staff or imaging examinations to judge vascular variations and lack equipment-level warning mechanisms, this device detects abnormal pressure distribution on the body surface through tactile sensors, and links the support components to make the flexible base in the corresponding area bulge to form a physical warning. At the same time, it triggers an audible and visual warning, which improves the accuracy of vascular variation recognition and greatly reduces the risk of vascular damage and angiography failure.

[0023] 5. This solution constructs a multi-sensor and graded early warning safety protection system, covering catheter clamping pressure monitoring, contrast agent leakage monitoring, and hemostasis pressure protection. Compared with the traditional technology that relies solely on manual observation to detect leakage and lacks catheter fixation pressure feedback and hemostasis pressure protection, this device ensures that the catheter clamping pressure meets the standard through the first pressure sensor, shortens the leakage detection response time through the capacitive leakage sensor, and avoids tissue damage caused by excessive pressure through the second pressure sensor. The incidence of contrast agent leakage complications is significantly reduced, and the comprehensiveness and timeliness of intraoperative safety protection are significantly improved.

[0024] 6. This solution achieves dynamic matching between the flexible substrate adhesion pressure and the strap restraint tension through the linkage adjustment of the fixed strap tension sensor and the support component. Compared with the traditional technology where the strap fixation tension relies entirely on the subjective judgment of medical staff, which is prone to problems such as excessive restraint causing patient discomfort or loose fixation causing displacement, this device can automatically control the strap tension within a safe range and adjust the deformation of the support component to adapt the adhesion pressure. This ensures fixation stability and avoids excessive restraint affecting abdominal blood circulation, significantly improving patient comfort during the operation. Attached Figure Description

[0025] Figure 1 This is an isometric view of an embodiment of the hepatic artery angiography auxiliary device for interventional treatment of liver cancer according to the present invention;

[0026] Figure 2 This is a bottom view of an embodiment of the hepatic artery angiography auxiliary device for interventional treatment of liver cancer according to the present invention;

[0027] Figure 3 This is a side view of an embodiment of the hepatic artery angiography auxiliary device for interventional treatment of liver cancer according to the present invention;

[0028] Figure 4 for Figure 3 A cross-sectional view along the AA direction.

[0029] The reference numerals in the accompanying drawings include: 1. Flexible substrate; 101. Installation space; 2. Arc-shaped connecting strip; 3. Adjustment box; 4. Drive component; 5. Two-way lead screw; 6. Slider; 7. Traction cable; 8. Conduit positioning groove; 9. Clamping plate; 10. Adjusting screw; 11. Adjusting knob; 12. Fixing strap. Detailed Implementation

[0030] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] The following detailed description illustrates the specific implementation method:

[0034] Example 1:

[0035] As attached Figures 1 to 4The image shows an auxiliary device for hepatic artery angiography in interventional treatment of liver cancer, comprising a fixed carrier for conforming to the patient's abdomen. The fixed carrier has a flexible base 1 for adapting to different patient abdominal contours and achieving flexible conformation, and several support components for providing rigid support and adjusting deformation. The flexible base 1 has an installation space 101 inside, and the support components are installed within the installation space 101. Each support component includes several arc-shaped connecting strips 2, which are hinged together to form a multi-directional deformable mesh structure. Several adjustment boxes 3 are installed on both sides of the flexible base 1. Each adjustment box 3 contains an adjustment component for driving the deformation of the arc-shaped connecting strips 2. Each adjustment component includes a drive element 4; in this embodiment, the drive element 4 is a servo motor. A bidirectional lead screw 5 is coaxially fixedly connected to the output shaft of the drive element 4. Nut seats are threaded to both ends of the bidirectional lead screw 5. A slider 6 is fixedly connected to the nut seats, and a traction cable 7 is fixedly connected to the slider 6. The traction cable 7 passes through the adjustment box 3 and the flexible base 1 and is hinged to a node of the arc-shaped connecting strip 2.

[0036] The drive unit 4 is connected to a control module. The control module controls the drive unit 4 to drive the bidirectional lead screw 5 to rotate forward and backward according to the preset patient body shape parameters. The screw 6 is driven to slide through the nut seat, which in turn pulls the steel cable 7 to move the node displacement of the arc-shaped connecting strip 2, causing the arc-shaped connecting strip 2 of the mesh structure to undergo multi-directional deformation.

[0037] The flexible base 1 has a catheter positioning groove 8 on the side facing the patient's abdomen. The inner wall of the catheter positioning groove 8 has an elastic buffer layer. A clamping plate 9 that can be adjusted laterally is provided on one side of the catheter positioning groove 8. An adjusting screw 10 is fixedly connected to one side of the clamping plate 9. The adjusting screw 10 is threadedly connected to the side wall of the flexible base 1. The adjusting screw 10 extends to the outside of the flexible base 1 and is fixed with an adjusting knob 11.

[0038] The flexible substrate 1 has a main contrast agent delivery channel inside. The input end of the main contrast agent delivery channel extends to the edge of the flexible substrate 1 and is equipped with a quick connector. The bottom of the catheter positioning groove 8 is equipped with a branch channel. The output end of the main contrast agent delivery channel is connected to the branch channel. The outlet of the branch channel is equipped with a sealing interface adapted to the contrast catheter. The main contrast agent delivery channel is equipped with a graphene heating sleeve. The inner wall of the graphene heating sleeve is equipped with a temperature sensor. The temperature sensor is connected to the control module. The control module adjusts the heating power of the graphene heating sleeve according to the data detected by the temperature sensor.

[0039] The clamping plate 9 is equipped with a first pressure sensor on its inner side. The first pressure sensor is connected to the control module. When the first pressure sensor detects that the catheter clamping pressure is lower than the preset first pressure threshold, the control module issues a warning message to prompt medical staff to rotate the adjustment knob 11 until the pressure reaches the first pressure threshold.

[0040] It also includes an early warning module, which comprises a tactile sensor, a capacitive leakage sensor, and an audible and visual alarm. All three are connected to the control module. The tactile sensor array is fixedly connected to the flexible substrate 1 on the side of the patient's abdomen. The capacitive leakage sensor is installed at the sealing interface of the catheter positioning groove 8, and the audible and visual alarm is installed on the top of the flexible substrate 1. The tactile sensor detects the pressure distribution on the patient's abdominal liver region. The control module compares the detected data with a preset normal hepatic artery surface projection pressure threshold. When the pressure distribution is abnormal, it is judged as a risk of vascular variation, and the audible and visual alarm issues a first-class warning. The capacitive leakage sensor detects contrast agent leakage. When the detected capacitance value change exceeds the change threshold, it is judged as leakage, and the audible and visual alarm issues a second-class warning.

[0041] The tactile sensor and the support assembly work together. When an abnormal pressure distribution on the body surface is detected, the control module drives the drive component 4 in the corresponding adjustment box 3 to work according to the position signal of the abnormal pressure area, and pulls the node displacement of the arc-shaped connecting strip 2 through the traction steel cable 7.

[0042] The edge of the flexible substrate 1 is provided with a fixing strap 12, and the free end of the fixing strap 12 is provided with Velcro. A tension sensor is embedded inside the fixing strap 12. The tension sensor is connected to the control module. The control module adjusts the working state of the drive component 4 according to the data detected by the tension sensor, so that the bonding pressure of the flexible substrate 1 matches the binding tension of the fixing strap 12.

[0043] The specific implementation process is as follows: First, based on the patient's specific condition (such as abdominal deformity due to liver cirrhosis, pediatric / obese body type, etc.), the flexible base 1 of the fixation carrier is attached to the patient's abdominal hepatic artery angiography area. The auxiliary device is then secured to the patient using Velcro at the free end of the fixation strap 12. During the binding process, the tension sensor inside the fixation strap 12 detects the restraint tension data in real time and transmits the data to the control module. The control module automatically adjusts the working state of the drive component 4 (servo motor) of the support assembly according to the preset tension threshold: if the tension sensor detects that the tension of the strap exceeds the preset tension threshold (over-restraint), the control module drives the servo motor to reverse, causing the bidirectional lead screw 5 to rotate in the opposite direction. The nut seat drives the slider 6 to slide in the opposite direction, loosening the traction cable 7, reducing the deformation amplitude of the mesh support assembly composed of the arc-shaped connecting strip 2, thereby reducing the contact pressure of the flexible base 1 on the patient's abdomen, avoiding excessive restraint that could cause patient discomfort or affect abdominal blood circulation, while ensuring that the device adapts to the patient's body shape and improves comfort; if the tension is lower than the preset tension threshold (not securely fixed), the servo motor works in the forward direction, tightening the traction cable 7, increasing the deformation of the support assembly, enhancing the contact pressure between the flexible base 1 and the abdomen, ensuring that the device will not shift due to slight changes in body position during the operation, providing a stable basis for catheter positioning.

[0044] After binding is complete, the early warning module is activated. The array of tactile sensors on the flexible substrate 1, which is attached to the patient's abdomen, begins to scan the pressure distribution on the liver area and transmits the detection data to the control module in real time. The control module compares the detected pressure distribution data with the preset normal hepatic artery surface projection pressure threshold. If an abnormal pressure distribution is detected in a certain area (the deviation exceeds the hepatic artery surface projection pressure threshold), it is determined that there may be a hepatic artery variation (such as abnormal branching, tortuous course, etc.) below that area. The control module immediately controls the audible and visual alarm to issue a first-class warning (red light + intermittent buzzer) to alert medical staff to the risk of vascular variation. At the same time, the tactile sensors and the support components are linked. Based on the position signal of the abnormal pressure area, the control module precisely drives the servo motor in the corresponding adjustment box 3 to work. Through the traction cable 7, the node displacement of the arc-shaped connecting strip 2 in that area is pulled, causing a slight bulge in the corresponding area of ​​the flexible substrate 1. The physical protrusions of this mechanical structure provide intuitive visual and tactile cues, helping medical staff to quickly locate normal blood vessels, effectively avoiding the accidental insertion of catheters into abnormal blood vessels, and significantly reducing the risk of angiography failure or vascular damage. Compared with the traditional method that relies on human experience, the accuracy of vascular variation identification is improved.

[0045] Based on the normal blood vessel location indicated by the warning prompts, medical staff place the angiography catheter within the catheter positioning groove 8 of the flexible base 1. The elastic buffer layer on the inner wall of the catheter positioning groove 8 initially conforms to the catheter surface, reducing hard friction between the catheter and the groove wall. Subsequently, medical staff rotate the adjustment knob 11, driving the adjustment screw 10 to move the clamping plate 9 laterally until the clamping plate 9 is tightly fitted to the catheter surface. The first pressure sensor inside the clamping plate 9 detects the clamping pressure in real time and feeds the data back to the control module. When the detected pressure reaches the preset first pressure threshold, the control module issues a warning sound via an audible and visual alarm to inform medical staff that the catheter is securely fixed. If the pressure is below the threshold, the control module continuously issues warning messages, prompting medical staff to continue rotating the adjustment knob 11 until the pressure reaches the target. Through the cooperation of the adjustable clamping plate 9 and the pressure sensor, secure clamping of angiography catheters of different diameters is achieved, avoiding vascular damage caused by catheter movement during the procedure. At the same time, the elastic buffer layer protects the outer wall of the catheter from damage. The catheter fixation stability is improved compared to existing equipment, and the incidence of catheter displacement is significantly reduced.

[0046] The external contrast agent supply line is connected to the main contrast agent delivery channel inside the flexible substrate 1 via a quick connector, activating the contrast agent heating function. The graphene heating sleeve inside the main contrast agent delivery channel begins operation, with a temperature sensor on its inner wall monitoring the contrast agent temperature in real time and transmitting the data to the control module. The control module dynamically adjusts the heating power of the graphene heating sleeve based on the monitoring data, ensuring the contrast agent temperature remains stable at 36-37℃ (close to human body temperature). Subsequently, medical staff initiate the angiography procedure. The contrast agent enters the angiography catheter through the main delivery channel, branch channels, and sealed interface, ultimately being injected into the patient's hepatic artery. The integrated graphene heating structure eliminates the need for additional external heating equipment, reducing surgical field interference and the risk of contrast agent leakage due to improper tubing connections. Simultaneously, the stable body-temperature-level contrast agent avoids hypothermia-induced vasospasm, improving angiography comfort and image clarity.

[0047] During the angiography process, the early warning module operates continuously, with a capacitive leakage sensor at the sealing interface of the catheter positioning groove 8 detecting contrast agent leakage in real time. When the detected capacitance value change exceeds a preset threshold, the control module determines that there is a contrast agent leakage and immediately activates the audible and visual alarm to issue a second-type warning (yellow light + continuous buzzer), prompting medical staff to handle the situation promptly. Compared to traditional manual observation, the leakage detection response time is significantly shortened, allowing for early warning in the early stages of leakage and preventing complications such as local tissue edema and necrosis. Simultaneously, the first pressure sensor continuously monitors the catheter clamping pressure. If the pressure falls below the threshold due to unexpected events during the procedure, the control module, in addition to issuing a warning, will also prompt medical staff to check the catheter fixation status, ensuring that the catheter remains stable throughout the angiography process, further guaranteeing angiography accuracy and patient safety.

[0048] After the angiography is completed, the contrast agent supply is shut off. Medical staff then rotate the adjusting knob 11 in the opposite direction to loosen the clamping plate 9 and remove the angiography catheter. Subsequently, the Velcro fasteners on the fixing strap 12 are released, and the device is removed from the patient, completing the entire angiography procedure. Throughout the process, the device, through its interconnected mechanical design, integrates patient fitting, vascular warning, catheter fixation, contrast agent heating, and leakage monitoring. This eliminates the need for frequent changes or connections of additional equipment, reduces the space occupied in the surgical field, shortens surgical preparation time, significantly improves surgical efficiency, and reduces the workload of medical staff.

[0049] Example 2:

[0050] The difference from Example 1 is that a metering valve is provided near the quick connector in the main channel for contrast agent delivery. The metering valve includes a valve seat, a valve core, and a drive gear set. The valve core is rotatably installed inside the valve seat. The side wall of the valve core is provided with a flow regulating hole. The drive gear set includes a driven gear fixedly connected to the valve core on the same axis and a driving gear fixedly connected to the adjusting screw 10 on the same axis. The driving gear meshes with the driven gear. When the adjusting screw 10 rotates, it drives the driving gear to mesh with the driven gear to rotate, thereby driving the valve core to rotate. The opening and closing degree of the flow regulating hole controls the amount of contrast agent delivered.

[0051] The specific implementation process is as follows: Medical staff place the angiography catheter into the catheter positioning slot 8, and rotate the adjusting knob 11 to drive the adjusting screw 10 to move the clamping plate 9 laterally. At this time, the adjusting screw 10 achieves a dual linkage action: on the one hand, the clamping plate 9 gradually approaches and clamps the catheter, and the first pressure sensor on the inner side of the clamping plate 9 detects the pressure in real time until it reaches the preset threshold, ensuring that the catheter is firmly fixed and avoiding vascular damage or contrast agent leakage caused by catheter shaking during the operation. On the other hand, the active gear fixed coaxially with the adjusting screw 10 rotates synchronously, meshing with the driven gear of the metering valve to drive the valve core to rotate. The opening degree of the flow regulating hole on the side wall of the valve core changes with the rotation of the valve core—the larger the catheter diameter, the greater the clamping force required, the greater the rotation amplitude of the adjusting screw 10, the greater the opening degree of the flow regulating hole, and the contrast agent delivery flow rate increases synchronously. The mechanical linkage of "catheter clamping" and "flow regulation" is achieved through the same adjusting screw 10, eliminating the need for additional flow control equipment, simplifying the surgical procedure, reducing surgical field interference, and achieving precise matching of flow rate and catheter diameter, which is significantly more accurate than the traditional independent control method.

[0052] Example 3:

[0053] The difference from Embodiment 2 is that the flexible base 1 is provided with foldable emergency hemostasis mechanisms on both sides corresponding to the catheter positioning groove 8. The emergency hemostasis mechanism includes a blood pressure plate hinged to the flexible base 1 via an elastic hinge. A medical hemostatic pad is provided on the inner side of the blood pressure plate. A locking component is provided inside the flexible base 1. The locking component includes an electromagnetic lock and a latch adapted to the electromagnetic lock. The latch is fixed to the free end of the blood pressure plate. The electromagnetic lock is signal-connected to the control module. When bleeding occurs during the operation, the control module controls the electromagnetic lock to unlock, and the blood pressure plate flips over to the top of the catheter positioning groove 8 under the restoring force of the elastic hinge.

[0054] The blood pressure relief plate is equipped with a second pressure sensor, which is connected to the control module. When the control module determines that the pressing pressure exceeds the second pressure threshold, the audible and visual alarm will issue a third type of warning to alert medical staff.

[0055] The specific implementation process is as follows: If sudden bleeding occurs during angiography (such as bleeding at the puncture site), medical staff can trigger an emergency hemostasis command through the control module, which immediately unlocks the electromagnetic lock. Under the restoring force of the elastic hinge, the blood pressure plate quickly flips over to the top of the catheter positioning slot 8, and the medical hemostatic pad on its inner side precisely covers the puncture site and bleeding area. Hemostasis can be achieved quickly without disassembling the catheter fixation structure. Compared with the traditional method of disassembling the stent to replace the hemostatic device, the emergency response time is shortened, and the catheter displacement caused by disassembly is avoided, which may aggravate bleeding. Medical staff can press the blood pressure plate to enhance the hemostatic effect. The second pressure sensor inside the blood pressure plate detects the pressing pressure in real time and transmits the data to the control module. When the pressure exceeds the second pressure threshold, the audible and visual alarm issues a third type of warning (orange light + rapid beep), prompting medical staff to reduce the pressing pressure to avoid excessive pressing that may cause local tissue damage or blood vessel rupture, thus achieving dual protection of hemostasis and tissue protection.

[0056] If bleeding is controlled, medical staff can press the blood pressure control plate and trigger the electromagnetic lock to fold it away, resuming the angiography procedure. If it is necessary to terminate the angiography, rotate the adjusting knob 11 in the opposite direction to loosen the clamping plate 9 and close the flow regulating orifice of the metering valve, stopping the contrast agent delivery. The folding design of the hemostasis mechanism does not affect subsequent operation switching, improving surgical flexibility.

[0057] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A hepatic artery angiography-assisted device for interventional treatment of liver cancer, comprising a fixation carrier for conforming to the patient's abdomen, the fixation carrier having a flexible base (1) for adapting to different patients' abdominal contours and achieving flexible conformation, and a plurality of support components for providing rigid support and adjusting deformation, the flexible base (1) having an installation space (101) inside, the support components being installed within the installation space (101), characterized in that, The support component includes several arc-shaped connecting strips (2), which are hinged to each other to form a mesh structure that can deform in multiple directions; Several adjustment boxes (3) are installed on both sides of the flexible base (1). Each adjustment box (3) is equipped with an adjustment component for driving the deformation of the arc-shaped connecting strip (2). The adjustment component includes a drive component (4). A two-way screw (5) is coaxially fixedly connected to the output shaft of the drive component (4). Nut seats are threaded to both ends of the two-way screw (5). A slider (6) is fixedly connected to the nut seat. A traction cable (7) is fixedly connected to the slider (6). The traction cable (7) passes through the adjustment box (3) and the flexible base (1) and is hinged to the node of the arc-shaped connecting strip (2). The drive unit (4) is connected to a control module. The control module controls the drive unit (4) to drive the bidirectional screw (5) to rotate forward and backward according to the preset patient body shape parameters. The screw (6) is driven to slide through the nut seat, thereby pulling the steel cable (7) to pull the node displacement of the arc-shaped connecting strip (2), so that the arc-shaped connecting strip (2) of the mesh structure undergoes multi-directional deformation.

2. The hepatic artery angiography auxiliary device for interventional treatment of liver cancer according to claim 1, characterized in that, The flexible base (1) has a catheter positioning groove (8) on the side facing the patient's abdomen. The inner wall of the catheter positioning groove (8) is provided with an elastic buffer layer. A clamping plate (9) that can be adjusted laterally is provided on one side of the catheter positioning groove (8). An adjusting screw (10) is fixedly connected to one side of the clamping plate (9). The adjusting screw (10) is threadedly connected to the side wall of the flexible base (1). The adjusting screw (10) extends to the outside of the flexible base (1) and is fixed with an adjusting knob (11).

3. The hepatic artery angiography auxiliary device for interventional treatment of liver cancer according to claim 2, characterized in that, The flexible substrate (1) has a main channel for contrast agent delivery. The input end of the main channel for contrast agent delivery extends to the edge of the flexible substrate (1) and is equipped with a quick connector. The bottom of the catheter positioning groove (8) is equipped with a branch channel. The output end of the main channel for contrast agent delivery is connected to the branch channel. The outlet of the branch channel is equipped with a sealing interface that is compatible with the contrast catheter. The main channel for contrast agent delivery is equipped with a graphene heating sleeve. The inner wall of the graphene heating sleeve is equipped with a temperature sensor. The temperature sensor is connected to the control module. The control module adjusts the heating power of the graphene heating sleeve according to the data detected by the temperature sensor.

4. The hepatic artery angiography auxiliary device for interventional treatment of liver cancer according to claim 3, characterized in that, A metering valve is provided near the quick connector in the main channel for contrast agent delivery. The metering valve includes a valve seat, a valve core, and a drive gear set. The valve core is rotatably installed inside the valve seat. The side wall of the valve core is provided with a flow regulating hole. The drive gear set includes a driven gear fixedly connected to the valve core on the same axis and a driving gear fixedly connected to the adjusting screw (10) on the same axis. The driving gear meshes with the driven gear. When the adjusting screw (10) rotates, it drives the driving gear to mesh with the driven gear to rotate, thereby driving the valve core to rotate. The amount of contrast agent delivered is controlled by the degree of opening and closing of the flow regulating hole.

5. The hepatic artery angiography auxiliary device for interventional treatment of liver cancer according to claim 4, characterized in that, The flexible base (1) is provided with foldable emergency hemostasis mechanisms on both sides corresponding to the catheter positioning groove (8). The emergency hemostasis mechanism includes a blood pressure plate that is hinged to the flexible base (1) by an elastic hinge. A medical hemostatic pad is provided on the inner side of the blood pressure plate. A locking component is provided inside the flexible base (1). The locking component includes an electromagnetic lock and a buckle adapted to the electromagnetic lock. The buckle is fixed to the free end of the blood pressure plate. The electromagnetic lock is connected to the control module signal. When bleeding occurs during the operation, the control module controls the electromagnetic lock to unlock. The blood pressure plate flips over to the top of the catheter positioning groove (8) under the restoring force of the elastic hinge.

6. The hepatic artery angiography auxiliary device for interventional treatment of liver cancer according to claim 5, characterized in that, The clamping plate (9) is equipped with a first pressure sensor on its inner side. The first pressure sensor is connected to the control module. When the first pressure sensor detects that the catheter clamping pressure is lower than the preset first pressure threshold, the control module issues a warning command to prompt medical staff to rotate the adjustment knob (11) until the pressure reaches the first pressure threshold.

7. The hepatic artery angiography auxiliary device for interventional treatment of liver cancer according to claim 6, characterized in that, It also has an early warning module, which includes a tactile sensor, a capacitive leakage sensor and an audible and visual alarm. The tactile sensor, the capacitive leakage sensor and the audible and visual alarm are all connected to the control module. The tactile sensor array is fixedly connected to the flexible substrate (1) and fits against the patient's abdomen. The capacitive leakage sensor is installed at the sealing interface of the catheter positioning groove (8). The audible and visual alarm is installed on the top of the flexible substrate (1). The tactile sensor is used to detect the pressure distribution on the surface of the liver area of ​​the patient's abdomen. The control module compares the detection data with the preset normal hepatic artery surface projection pressure threshold. When the pressure distribution is abnormal, it is judged as a risk of vascular variation, and the audible and visual alarm issues a first-class warning. The capacitive leakage sensor is used to detect contrast agent leakage. When the detected capacitance value change exceeds the change threshold, it is judged as leakage, and the audible and visual alarm issues a second-class warning.

8. The hepatic artery angiography auxiliary device for interventional treatment of liver cancer according to claim 7, characterized in that, The blood pressure relief plate is equipped with a second pressure sensor, which is connected to the control module. When the control module determines that the pressing pressure exceeds the second pressure threshold, the audible and visual alarm will issue a third type of warning to alert medical staff.

9. The hepatic artery angiography auxiliary device for interventional treatment of liver cancer according to claim 8, characterized in that, The tactile sensor and the support component work together. When an abnormal pressure distribution on the body surface is detected, the control module drives the drive component (4) in the corresponding adjustment box (3) to work according to the position signal of the abnormal pressure area. The drive component (4) is pulled by the traction steel cable (7) to move the node of the arc-shaped connecting strip (2).

10. The hepatic artery angiography auxiliary device for interventional treatment of liver cancer according to claim 9, characterized in that, The edge of the flexible substrate (1) is provided with a fixing strap (12), the free end of the fixing strap (12) is provided with Velcro, and a tension sensor is embedded inside the fixing strap (12). The tension sensor is connected to the control module. The control module adjusts the working state of the drive component (4) according to the data detected by the tension sensor, so that the bonding pressure of the flexible substrate (1) matches the binding tension of the fixing strap (12).

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