Steady state judgment method and system for intracranial artery stenosis balloon dilatation

Abstract

The invention discloses a steady state judgment method and system for an intracranial artery stenosis balloon dilatation, which are used for solving the problem that the prior art depends on subjective experience and lacks quantitative criteria. The method comprises the following steps: synchronously acquiring a balloon perspective image and system pressure data in real time; extracting the minimum inner diameter (D) and the pressure (P) of the balloon; continuously calculating the instantaneous change rate (V) of D and P and the trend change rate (S) based on the time window by taking the change rate percentage per second (% / second) as a unified dimension; and based on the steady-state threshold (theta f) and the steady-state threshold (theta s), rapid steady-state judgment is performed after pressurization pause, and continuous steady-state judgment is performed in the maintenance stage. The system comprises various functional modules for realizing the method. The judgment result is subjected to silent feedback by changing visual attributes such as an instantaneous change rate curve and the like. According to the method, conversion from experience driving to data driving is achieved, objective decision support is provided for individualized precise expansion, and the purpose of synchronously improving operation safety and efficiency is achieved.

Description

Technical Field

[0001] This invention relates to the field of neurointerventional medical technology, specifically to a method and system for determining steady-state conditions during intracranial artery stenosis balloon dilation, particularly a method and system for determining the mechanical balance state during dilation by real-time synchronous monitoring of pressure and morphological changes inside the balloon and based on quantitative standards. Background Technology

[0002] Intracranial arterial stenosis is a major cause of ischemic stroke, and balloon angioplasty is one of its primary treatments. Currently, the "slow dilation" technique is widely used clinically, which involves slowly increasing pressure by 1 to 2 atmospheres every 15 to 30 seconds, maintaining the target pressure for 30 to 60 seconds, and then slowly depressurizing. This strategy aims to allow the plaque to undergo slow plastic deformation, reducing complications such as vascular dissection and plaque rupture caused by uneven stress distribution. However, excessively slow dilation increases the blood flow occlusion time, increasing the risk of cerebral ischemia.

[0003] The existing technology has the following significant limitations: 1. High dependence on experience: Plaques vary greatly among patients in terms of morphology, composition, and hardness. The rate of intraoperative pressurization, target pressure, and maintenance time mainly depend on the surgeon's experience, and are subjectively judged by visual observation of balloon morphology in two-dimensional digital subtraction angiography (DSA) fluoroscopic images, lacking objective quantitative standards; 2. Lack of individualized and precise control: Fixed "slow expansion" parameters cannot be adapted to all patients. For soft plaques, the expansion rate may be too slow, while for tough plaques, the expansion rate may be insufficient or require a longer time. There is a lack of an individualized adjustment mechanism that provides real-time feedback guidance. 3. Difficulty in balancing risks: Excessive expansion prolongs the blood flow occlusion time, increasing the risk of cerebral ischemia; excessive expansion easily leads to vascular damage. Current technology lacks engineered real-time judgment methods to optimize this balance.

[0004] Currently, obtaining high-precision real-time intraballoon pressure data and clear DSA images during balloon dilation is possible. However, how to deeply integrate and analyze these two data to generate objective quantitative criteria for intraoperative decision-making remains an unresolved gap in current technology. This leads to significant individual differences in surgical outcomes and risk control. Therefore, developing a technical solution that can determine the biomechanical state of the balloon-plaque system in real time based on synchronous "pressure-morphology" time-series data and provide quantitative decision support for individualized and precise dilation has urgent clinical needs and significant technological value. Summary of the Invention

[0005] (a) Purpose of the invention This invention aims to address the problems of existing balloon dilation techniques that rely on subjective experience and lack quantitative criteria. It provides a steady-state determination method and system based on "simultaneous analysis of pressure and morphology dual parameters." By defining and determining the "mechanical steady state" during dilation in real time, it provides surgeons with objective and quantitative operational node signals, enabling a shift from experience-driven to data-driven approaches. This reduces the reliance on surgeon experience, achieves individualized and precise dilation control, and simultaneously improves surgical safety and efficiency.

[0006] To achieve the above objectives, this invention proposes an innovative principle and its quantitative determination method based on the "mechanical steady state of the balloon-plaque system".

[0007] Core Principle: This invention recognizes that a fundamental challenge for surgeons during intracranial artery stenosis balloon angioplasty is the inability to directly observe the internal mechanical state of the balloon-plaque interface. To address this challenge, this invention discovers and utilizes two macroscopic physical parameters that are strongly correlated with the internal state and can be non-invasively acquired in real time—system pressure (P) and minimum balloon diameter (D)—to construct a criterion for indirectly sensing the system's mechanical equilibrium.

[0008] System pressure (P) directly reflects the overall energy state and irreversible deformation process of the system: the pressure pump, liquid medium, and balloon catheter constitute a closed elastic hydraulic system. When active pressurization is stopped, if the balloon is still compressing the plaque and causing plastic or fracture deformation, the system volume (mainly the balloon volume) will increase accordingly, leading to a macroscopic decrease in system pressure (P). The decrease in pressure directly indicates that the system energy is still being used to drive the irreversible deformation of the plaque. Conversely, if P stabilizes rapidly, it indicates that the system energy input and plaque deformation dissipation have reached equilibrium, and the main irreversible deformation process has essentially stopped. Therefore, the time-varying characteristics of P are a key macroscopic parameter for judging whether the overall mechanical process of the system tends to be static.

[0009] The minimum inner diameter (D) of the balloon is a direct morphological observation of the mechanical equilibrium at the local point of highest stress at the balloon-plaque interface: mechanically, the minimum inner diameter of the balloon is the location of the most concentrated stress and contact with the most prominent part of the plaque. Dimensional changes at this point are extremely sensitive to the local mechanical response of the plaque (such as yielding, fracture, and creep). Stability of D directly indicates that this local high-stress zone has reached mechanical equilibrium, and is a direct external morphological marker of the plaque's resistance to further plastic flow or fracture from the core.

[0010] Based on the above understanding, this invention defines for the first time a key critical state of this dynamic mechanical system—the pressure-morphological bistable state. In this state: 1. Mechanical equilibrium: The hydraulic pressure inside the balloon, the elastic recoil force of the balloon material, and the elastic reaction force of the plaque on the balloon are in dynamic equilibrium. 2. Deformation properties: When energy input stops, the balloon's effect on the plaque only maintains recoverable elastic deformation and no longer produces new irreversible deformation; 3. Macroscopic characterization: As the inevitable external manifestation of the above internal equilibrium, the proxy variables that can be simultaneously and non-invasively observed—system pressure (P) and minimum inner diameter of the balloon (D)—will simultaneously enter and maintain a stable state in which the rate of change approaches zero.

[0011] Therefore, the core of this invention lies in the fact that by monitoring the rate and trend of change of pressure (P) and minimum inner diameter (D) in real time and synchronously, it is possible to non-invasively, indirectly, and reliably determine whether the "balloon-plaque" system has reached the aforementioned bistable state. This determination provides a clear physical basis and a quantitative "endpoint" for "whether the pressurization rate is appropriate" and "when to safely depressurize after maintenance".

[0012] On one hand, the present invention provides a method for determining steady state during balloon dilation for intracranial arterial stenosis, characterized by comprising the following steps.

[0013] S1: During balloon dilation, acquire and synchronize digital subtraction angiography (DSA) fluoroscopic image sequences and pressure data sequences from the pressure pump system in real time.

[0014] S2: For each frame of synchronized image, extract the balloon contour and calculate its minimum inner diameter as the morphological parameter D(t), and obtain the synchronized pressure parameter P(t) to form a time-aligned data pair {D(t), P(t)}.

[0015] S3: Based on the time-series data pair {D(t), P(t)}, automatically select or calculate the following two rates of change in parallel according to the surgical stage. The calculation results are expressed as a percentage of change per second (% / second): Instantaneous rate of change (V): Calculates the rate of change of D and P values ​​between adjacent frames; Trend change rate (S): Based on historical data within a preset sliding time window, the average trend of change of D and P is calculated through linear regression analysis.

[0016] S4: Based on the calculation results of step S3, continue to perform steady-state determination logic operations: Rapid stabilization determination: During the balloon inflatation phase, if the absolute values ​​of the instantaneous rate of change (V) of the morphological parameter D and the pressure parameter P are continuously less than the stabilization threshold (θ_f) within the preset rapid assessment window (W_f), the system is determined to have reached a rapid stabilization state, indicating that the current inflatation rate is appropriate. Continuous steady-state determination: During the balloon maintenance phase, if the absolute value of the rate of change (S) of the trend of the morphological parameter D and the pressure parameter P is continuously less than the steady-state threshold (θ_s) within a continuous steady-state confirmation window (W_s), the system is determined to have reached a continuous steady state, indicating that it is safe to depressurize.

[0017] S5: Encode the determination result of step S4 into the visual state of the time curve of morphological parameter D, the time curve of pressure parameter P, and the curves of their rate of change in the display interface; wherein, when it is determined to be a rapid steady state or a continuous steady state, the corresponding steady state indication state is output, otherwise the unsteady state indication state is output.

[0018] On the other hand, the present invention provides a steady-state determination system for balloon dilation of intracranial arterial stenosis, used to implement the above method, characterized in that it includes: M1: Data synchronization acquisition module, used to achieve time alignment between perspective image sequence and pressure data sequence through high-precision clock, timestamp matching and interpolation algorithm, and output synchronized time series data pair {D(t), P(t)}; M2: Image analysis module, connected to the data synchronization acquisition module, used to process each frame of perspective image to extract the minimum inner diameter D of the balloon; M3: Continuous calculation and analysis module, connected to the data synchronization acquisition module and the image analysis module, used to receive the synchronized {D, P} sequence, perform filtering processing, calculate the instantaneous rate of change (V) and trend rate of change (S) (both expressed in % / second), and perform the fast stabilization determination and continuous steady state determination logic operations; M4: Silent visualization output module, connected to the continuous calculation and analysis module, used for: Real-time plotting and display: the first curve of the minimum inner diameter of the balloon (morphological parameter D) changing with time, the second curve of the system pressure (pressure parameter P) changing with time, and the instantaneous rate of change curves of both; Simultaneously display the real-time values ​​of morphological parameter D and pressure parameter P, as well as the quantitative results of instantaneous rate of change and trend rate of change, and the steady-state determination status; Based on the judgment results output by the continuous calculation and analysis module, the visual state of the real-time rate of change curve is updated by changing one or more visual attributes such as color (e.g., switching to red in the steady state stage), line type, or transparency, so as to intuitively distinguish different mechanical stages.

[0019] In another aspect, the present invention provides a neurointerventional surgical system, which includes a digital subtraction angiography device, a balloon dilation catheter and a pressure pump, characterized in that it also includes the intracranial artery stenosis balloon dilation steady-state determination system as described above; The steady-state determination system is communicatively connected to the digital subtraction angiography device and the pressure pump, and its visualization output module's display interface serves as an auxiliary information panel for the main operation interface of the digital subtraction angiography device.

[0020] In another aspect, the present invention provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor executes the program to implement the method described above.

[0021] Compared with the prior art, the present invention has the following significant advantages: 1. Innovative Principles and Pioneering Criteria: The "pressure-morphological bistable state" quantifiable intraoperative criterion was pioneered. Through a unified dimension (% / second) and a phased calculation mode (determination of rapid stabilization and determination of continuous steady state), the judgment logic is made mathematically more rigorous and accurately corresponds to the physical process of different surgical stages, realizing a fundamental shift from experience-based intuition to physical model guidance.

[0022] 2. Formation of intelligent closed-loop control: Through real-time calculation and silent feedback, the surgeon is guided to dynamically adjust the operation, forming a closed-loop surgical process of "data acquisition → intelligent analysis → real-time feedback → decision adjustment", which improves the controllability and predictability of the surgery.

[0023] 3. Combining safety and efficiency: By accurately identifying steady-state points, it can ensure that the plaque is fully reshaped while avoiding meaningless overexpansion and prolonged blood flow obstruction, thus achieving an optimized balance between safety and surgical efficiency.

[0024] 4. Adapts to clinical operating habits: It adopts silent visual coding feedback, abandons the active reminder mode, respects the high requirements of neurointerventional surgery for the surgeon's attention continuity, and gives the surgeon the initiative to obtain information, which is easily accepted and promoted in clinical practice. Attached Figure Description

[0025] Figure 1 : Schematic diagram of the integration of the steady-state determination system of this invention with surgical equipment; Figure 2 : Overall flowchart of the method and feedback process of this invention; Figure 3 : A schematic diagram of the visual output interface; Figure 4 : Schematic diagram for calculating the rate of change.

[0026] Explanation of reference numerals in the attached figures: In the diagram: 1-Steady-state determination system, 2-Main display screen of angiography machine, 3-Auxiliary display screen of angiography machine, 4-Interventional operating table, 5-Schematic diagram of balloon catheter dilation status during operation, 6-Balloon catheter, 7-Balloon pressure monitoring unit, 8-Pressure pump, 9-Operator position, 11-Real-time display area of ​​system pressure P, 12-Real-time display area of ​​minimum inner diameter of balloon D, 13-Instantaneous change rate and steady-state indicator display area, 14-Trend change rate and steady-state indicator display area, 15-Plotting area of ​​system pressure change curve, 16-Plotting area of ​​minimum inner diameter of balloon change curve, 17-Plotting area of ​​instantaneous change rate of system pressure curve, 18-Plotting area of ​​instantaneous change rate of minimum inner diameter of balloon. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0028] Example 1: System Architecture and Data Fusion like Figure 1 As shown, the steady-state determination system (1) serves as the core of data processing and works in conjunction with existing digital subtraction angiography equipment and pressure pump systems.

[0029] 1. Physical Basis: The pressure pump (8), liquid medium, and balloon catheter (6) together constitute an elastic closed hydraulic system. The physical characteristics of this system are the cornerstone of this method: the immediacy and uniformity of pressure transmission make monitoring the pressure value P at the output end of the pressure pump equivalent to obtaining the pressure inside the balloon in real time; the elastic dynamic response of the system allows the change of P to non-invasively reflect the plastic deformation process of the "balloon-plaque" interface.

[0030] 2. Data source: Image data is acquired in real time through the video output interface of the main display screen (2) of the angiography machine at a surgical fluoroscopy frame rate of 2-15 frames / second; pressure data comes from the pressure data packet with time stamp emitted by the balloon pressure monitoring unit (7).

[0031] 3. Data Synchronization and Fusion: The system (1) has a built-in high-precision clock. The data synchronization acquisition module (M1) assigns a synchronous pressure value P to each frame of perspective image through timestamp matching and interpolation algorithms, generating precisely aligned time-series data pairs {D(t), P(t)}. This step unifies spatial morphological information and system mechanical information on the time axis, which is the basis for all subsequent real-time calculations and judgments.

[0032] Example 2: Implementation of the Core Algorithm like Figure 2 and Figure 4As shown, the core of steady-state determination is a two-parameter rate of change analysis model based on a unified dimension (% / second).

[0033] 1. Image processing and feature extraction: The image analysis module (M2) performs grayscale conversion and Gaussian filtering noise reduction on each frame of the image. It identifies the elliptical contour of the balloon-like shape through the Canny edge detection algorithm and calculates the minimum Euclidean distance between all points on the contour as the minimum inner diameter D of the balloon.

[0034] 2. Data filtering: The continuous calculation and analysis module (M3) applies moving average filtering or low-pass filtering to the original D(t) and P(t) sequences to smooth out high-frequency interference caused by vascular pulsation, image noise and small pressure fluctuations, and obtain smoothed sequences D_s(t) and P_s(t).

[0035] 3. Unified rate of change calculation: The continuous calculation and analysis module (M3) calculates two rates of change in parallel according to the surgical stage, and the results are output as a percentage of change per second (% / second).

[0036] Instantaneous rate of change (V): This mode is mainly used for rapid stabilization determination (e.g., Figure 4-1 Calculate the change between two adjacent frames of smoothed data: V(t) = [ (S(t) - S(t-Δt)) / S(t-Δt) ] / Δt, where S represents D_s or P_s, and Δt is the frame time interval (seconds). The result is in % / second.

[0037] Trend change rate (S): This model is mainly used for determining sustained steady state (e.g., Figure 4-2 Set a steady-state confirmation window (W_s) (e.g., 3-5 seconds). Perform linear regression on the time series data of D_s and P_s within the window to obtain the slope k of the fitted line. Divide the slope k by the average value S_avg of the data within the window to obtain the rate of change of trend: S = k / S_avg, also in % / second.

[0038] 4. Steady-state determination logic: Two key thresholds are preset: a stabilization threshold (θ_f) and a steady-state threshold (θ_s). The stabilization threshold (θ_f) typically ranges from 2% / second to 5% / second and is used to determine whether the change rapidly decays to a low level after pressurization is paused. The steady-state threshold (θ_s) typically ranges from 0.2% / second to 1% / second and is used to determine whether true mechanical equilibrium has been reached during the maintenance phase. These thresholds can be fine-tuned by the user within the system based on the device characteristics.

[0039] Rapid stabilization assessment: During the compression phase, after the surgeon pauses compression, the system uses the instantaneous rate of change (V) for assessment. If, within a rapid assessment window (W_f) (e.g., 1-2 seconds), |V_D| < θ_f and |V_P| < θ_f are consistently satisfied, it is determined that "rapid stabilization has been achieved," indicating that the current compression rhythm is good.

[0040] Steady-state determination: During the maintenance phase, the system primarily uses the rate of change of trend (S) for determination. If, within a continuous steady-state confirmation window (W_s) (e.g., 5-8 seconds), |S_D| < θ_s and |S_P| < θ_s are consistently satisfied, then the system is ultimately determined to have reached and maintained a pressure-morphological bistable state (sustained steady state). At this point, irreversible plaque deformation has ceased, and pressure can be safely released.

[0041] Example 3: Integration of Visual Output with Surgical Procedure As shown in Figures 2 and 3, the interaction logic of this invention revolves entirely around "silent assistance" and "on-demand retrieval," and is specifically implemented as follows: 1. Interface Layout: The display interface of the silent visualization output module (M4) is deployed on the auxiliary display screen (3) next to the main display screen (2) of the angiography machine or on an independent screen. The interface layout is adapted to the clinical monitoring needs. Upper area: The left side is the real-time value display area, which is the real-time value display area of ​​system pressure P and the real-time value display area of ​​balloon minimum inner diameter D (12); the right side is the curve drawing area, which is the curve drawing area of ​​system pressure change (15) and the curve drawing area of ​​balloon minimum inner diameter change (16). The curves of balloon minimum inner diameter change with time and system pressure change with time are drawn in real time. The coordinate axis range is preset to the range of commonly used clinical parameters. The lower area: The left side is the instantaneous change rate and steady state indicator display area (13) and the trend change rate and steady state indicator display area (14), which simultaneously displays the instantaneous change rate and trend change rate of D and P, and intuitively presents the judgment result through the "steady state" red indicator or the "non-steady state" black indicator; the right side is the system pressure instantaneous change rate curve drawing area (17) and the balloon minimum inner diameter instantaneous change rate curve drawing area (18), which draws the instantaneous change rate curves of D and P VD(t) and VP(t) in real time.

[0042] 2. Silent Feedback Mechanism: After system startup, all rate-of-change curves default to a non-steady-state indication state (e.g., solid black line). The continuous calculation and analysis module runs automatically in the background. When, based on the judgment logic in Figure 2, the system is judged to be in a "rapid stabilization state" during the pressure-addition phase (instantaneous rate of change V < stabilization threshold θ_f), or in a "continuous steady state" during the maintenance phase (trend rate of change S < steady-state threshold θ_s), the corresponding rate-of-change curves (R_D(t), R_P(t)) will seamlessly switch to a steady-state indication state (e.g., solid red line). If the parameter change exceeds the threshold, the curve will automatically revert to the non-steady-state indication state. The entire process is free of flickering, pop-ups, or audio interference; state information is conveyed solely through the smooth switching of the curve's visual attributes.

[0043] 3. Intraoperative Application Procedure: After the balloon is in place, the system is activated. The operator can focus on the main operation and the main display screen of the angiography machine, only checking the auxiliary screen as needed at key decision points: when a decision is required (such as pausing pressure for observation, or determining whether to end maintenance), briefly check the auxiliary screen. If the display shows a steady-state indication, it indicates that the system has reached a steady state or is rapidly stabilizing, and the next operation can be performed; if it shows a non-steady-state indication, it indicates that the system is still changing and requires continued observation or adjustment.

[0044] It should be noted that the specific manifestations of steady-state and non-steady-state indications are not limited to color, but may also include combinations of visual attributes such as curve type, thickness, and transparency. The above embodiments fully demonstrate the present invention's deep understanding and respect for real-world clinical workflows while providing high-value intelligent assistance. Any modifications and substitutions made without departing from the principles of the present invention should fall within the protection scope of the present invention.

Claims

1. A steady state determination method for intracranial arterial stenosis balloon angioplasty, characterized by, Includes the following steps: S1: During balloon dilation, acquire and synchronize digital subtraction angiography fluoroscopic image sequences and pressure data sequences of the pressure pump system in real time; S2: For each frame of synchronized image, extract the balloon contour and calculate its minimum inner diameter as the morphological parameter D(t), and obtain the synchronized pressure parameter P(t) to form a time-aligned time series data pair {D(t), P(t)}. S3: Based on the time-series data pair, continuously calculate the percentage change rate per second reflecting the rate of change of the morphological parameter D(t) and the pressure parameter P(t), the calculation including: The instantaneous rate of change V(t) of the morphological parameter D(t) and the pressure parameter P(t) are calculated in parallel. Based on a preset sliding time window, the trend change rate S(t) of the morphological parameter D(t) and the pressure parameter P(t) is calculated; S4: Based on the calculation results of step S3, and combined with the steady-state determination logic executed during the surgical phase: Rapid stabilization determination: During the balloon inflatation phase, if, after the surgeon pauses inflatation, the absolute values ​​of the instantaneous rate of change V(t) of the morphological parameter D(t) and the pressure parameter P(t) are both continuously less than the first preset threshold (θ_f) within the preset rapid evaluation window (W_f), then the system is determined to have reached a rapid stabilization state. Continuous steady state determination: During the balloon maintenance phase, if the absolute values ​​of the trend change rates S(t) of the morphological parameter D(t) and the pressure parameter P(t) are both continuously less than the second preset threshold (θ_s) within a continuous steady state confirmation window (W_s), then the system is determined to have reached a continuous steady state. S5: The determination result of step S4 is silently fed back by changing the visual attributes of at least one of the instantaneous rate of change curves or trend rate of change indicators in the display interface; wherein, when it is determined to be a rapid stabilization state or a continuous steady state, the curve or indicator is controlled to present a first visual state, otherwise a second visual state is presented.

2. The method of claim 1, wherein, In step S1, the image sequence and pressure data sequence are time-stamped and interpolated using a high-precision clock to achieve data synchronization.

3. The method according to claim 1, characterized in that, In step S2, the balloon contour is extracted by an edge detection algorithm, and the minimum inner diameter D(t) is obtained by calculating the minimum Euclidean distance between pairs of points on the contour.

4. The method according to claim 1, characterized in that, The instantaneous rate of change V(t) is calculated as follows: V(t) = [(X(t) - X(t-Δt)) / X(t-Δt)] / Δt, where X represents D(t) or P(t), and Δt is the data sampling time interval.

5. The method according to claim 1, characterized in that, The trend change rate S(t) is calculated as follows: linear regression is performed on the D(t) or P(t) data within the sliding time window to obtain the slope k, and k is divided by the average value of the data within the window to obtain S(t).

6. The method according to claim 1, characterized in that, The first preset threshold (θ_f) ranges from 2% / second to 5% / second; the second preset threshold (θ_s) ranges from 0.2% / second to 1% / second.

7. A steady-state determination system for balloon dilation of intracranial arterial stenosis, used to implement the method according to any one of claims 1 to 6, characterized in that, include: The data synchronization acquisition module (M1) is used to synchronize the perspective image sequence and the pressure data sequence, and output the time series data pair {D(t), P(t)}. The image analysis module (M2) is used to process each frame of perspective image to extract the minimum inner diameter D(t) of the balloon; The continuous calculation and analysis module (M3) is used to filter the time series data pairs, calculate the instantaneous rate of change V(t) and the trend rate of change S(t), and perform rapid stabilization determination and continuous steady-state determination. The silent visualization output module (M4) is used to draw and display the curves of the morphological parameter D(t), pressure parameter P(t), and their instantaneous rate of change V(t) in real time; and to provide silent feedback by changing the visual attributes of the instantaneous rate of change curve or the trend rate of change indicator based on the judgment result.

8. A neurointerventional surgical system, comprising a digital subtraction angiography device, a balloon dilation catheter, and a pressure pump, characterized in that, It also includes the intracranial artery stenosis balloon dilation steady-state determination system as described in claim 7; The steady-state determination system is communicatively connected to both the digital subtraction angiography device and the pressure pump.

9. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the method as described in any one of claims 1 to 6.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method as described in any one of claims 1 to 6.

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