Control method, device and storage medium based on optical coherence tomography

Abstract

This application relates to the field of ophthalmic surgery technology, and more particularly to a control method, device, and storage medium based on optical coherence tomography (OCT). The control method based on OCT includes: acquiring the surgical field of view and tracking in real time the aspiration port or instrument tip of the intraocular end of the surgical instrument; performing OCT scanning based on the aspiration port or instrument tip to obtain an OCT image; processing the OCT image and emitting an OCT image signal according to preset conditions; measuring the flow rate and / or pressure in the aspiration tubing; and issuing a control signal at least based on the OCT image signal, the control signal being used to control the on / off or adjustment of fluid aspiration and / or ultrasonic vibration. Furthermore, it allows for direct visual perception, enabling real-time monitoring of the precise spatial relationship between the surgical instrument and the delicate intraocular tissues, thereby improving the system's safety and efficiency, and enhancing the precision and safety of the surgery.

Description

Technical Field

[0001] This application relates to the field of ophthalmic surgery technology, and in particular to control methods, devices and storage media based on optical coherence tomography. Background Technology

[0002] In recent years, ophthalmic surgical techniques have made significant progress, with emerging technologies such as phacoemulsification and femtosecond laser technology being widely used in the treatment of ophthalmic diseases. However, existing intelligent ophthalmic surgical control systems still have some problems that urgently need to be solved. Traditional ophthalmic surgical control systems mainly rely on parameters such as flow rate and pressure in the fluid control module as feedback data to control fluid speed and power. Such systems lack direct visual perception capabilities and cannot grasp the precise spatial relationship between surgical instruments and delicate intraocular tissues in real time, thus indirectly leading to bottlenecks in system safety and efficiency: the adjustment of energy and fluid control parameters cannot be optimized based on the most critical anatomical context, thereby limiting the upper limit of surgical precision and safety. Summary of the Invention

[0003] This application proposes a control method based on optical coherence tomography, including: Obtain the surgical field of view and track the suction port or instrument tip of the surgical instrument in real time. Perform OCT scanning based on the suction port or instrument tip to obtain OCT images. Process OCT images and emit OCT image signals according to preset conditions; Measure the flow rate and / or pressure in the suction line; At least based on the aforementioned OCT image signal, a control signal is issued, which is used to control the opening, closing, or adjustment of the fluid flow and / or ultrasonic vibration.

[0004] Another aspect of this application discloses an ophthalmic surgical device, comprising: It has a control module, an infusion / aspiration module, and an ultrasound module; The infusion / suction module also includes sensors for measuring flow rate and / or pressure in the suction line; It also includes surgical instruments with an instrument head that achieves ultrasonic vibration under the control of the ultrasound module. The surgical instruments have a suction port, through which fluid is aspirated under the control of the irrigation / aspiration module. The surgical instruments also have an irrigation port, through which fluid is infused into the eye under the control of the irrigation / aspiration module to maintain intraocular pressure. The control module can receive OCT image signals, flow and / or pressure information from the aspiration module, and output control signals according to the aforementioned control method based on optical coherence tomography to control the opening, closing, or adjustment of fluid flow and / or ultrasonic vibration.

[0005] In another aspect, this application proposes a computer-readable storage medium storing a computer program that, when executed, implements the control method described in any of the preceding claims. Attached Figure Description

[0006] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This illustration shows an example of a control method based on optical coherence tomography provided in this embodiment; Figure 2 This embodiment illustrates an example of OCT image signal determination. Figure 3 This illustration shows an example of a control signal determination provided in this embodiment; Figure 4a This illustration shows an example diagram of an OCT image provided in this embodiment. Figure 4b This illustration shows an example of the volume of the anterior chamber area provided in this embodiment; Figure 5 This illustration shows an example diagram of an ophthalmic surgical device provided in this embodiment. Detailed Implementation

[0007] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the meaning of the above terms in this application according to the circumstances.

[0008] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 this application. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0009] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0010] Specifically, the ophthalmic surgical negative pressure control system and negative pressure control method of the present application are described below with reference to the accompanying drawings.

[0011] like Figure 1 As shown, this embodiment provides a control method based on optical coherence tomography, including: S11: Obtain the surgical field of view and track the suction port or instrument tip of the surgical instrument in real time, and perform OCT scanning based on the suction port or instrument tip to obtain OCT images. S12: Process the OCT image and send an OCT image signal according to preset conditions; S13: Measure the flow rate and / or pressure in the suction line; S14: At least based on the OCT image signal, a control signal is issued, the control signal being used to control the on / off or adjustment of the fluid flow and / or ultrasonic vibration. The control signal is used to control the on / off or adjustment of the fluid flow and / or ultrasonic vibration.

[0012] The surgical field of view refers to the frontal view during surgery. Generally, surgeons observe the surgical subject's frontal surgical field of view using an optical microscope. Simultaneously, a photosensitive element couples the optical field of view with the electronic surgical field of view image, allowing for computer-based image analysis and processing. Furthermore, based on the surgical field of view, OCT scanning can be performed according to input or preset parameters, outputting an OCT image. The acquired OCT image can be a single B-scan image, multiple B-scan images based on different scanning parameters, or other forms of scanning images, such as volumetric scans.

[0013] Specifically, by tracking the movement of surgical instruments and the eyeball through the surgical field of view (or surgical microscopy), OCT scans can consistently track specific locations on the eyeball or the tip of the surgical instrument. By identifying the surgical field of view image and processing the image using a deep neural network, the position of the suction port or tip of the surgical instrument inside the eye and the posture of the surgical instrument can be determined, thereby obtaining OCT images that track specific locations.

[0014] The generation of OCT image signals can be achieved by generating one or more OCT image signals. This requires image processing of the OCT images. The OCT images can be processed by the control module or by other modules or devices to generate the corresponding OCT image signals.

[0015] The surgical instrument is an ophthalmic surgical tool with a suction port. It is an instrument with both ultrasonic and liquid aspiration functions. For example, the surgical instrument can be an phacoemulsification handpiece, a phacoemulsification handpiece, or a wave-cutting handpiece. For example, the surgical instrument may have an mountable instrument head to achieve ultrasonic vibration, with a suction port connected to the instrument head.

[0016] OCT scans can be performed based on the aspiration port or tip of the surgical instrument. The aspiration port or tip can be a port or tip inherent to the surgical instrument itself, or it can be a port or tip attached to the instrument head. Preferably, a specific scanning direction is used so that both the aspiration port and the instrument tip can be simultaneously identified on the OCT image.

[0017] Flow control includes flow control of the suction line and the infusion line. Generally, sensors can measure the flow rate and / or pressure of the suction line. For example, by measuring the negative pressure of the suction line, the suction status can be evaluated. The suction line is generally operated by a suction pump, and the suction force of the pump can be evaluated by the flow rate or pressure (usually negative pressure) of the liquid in the suction line. For example, when the suction pump is a peristaltic pump, suction is created by the rotation of rollers squeezing the suction line. When the suction line is blocked, a negative pressure is generated in the suction line. Sensors can also be installed on the infusion line to detect the flow rate or pressure.

[0018] For example, controlling the opening, closing, or adjustment of fluid flow includes controlling the opening, closing, or adjustment of fluid flow in the suction section and / or the infusion section. Adjustment of the fluid flow includes controlling the suction rate, or adjusting parameters such as the suction rate and negative pressure of the suction pipeline via the suction pump, replacing the suction pump, or adjusting the suction mode; or adjusting parameters such as the infusion pressure, infusion height, negative pressure and pressure of the injection / suction oil, or adjusting the infusion mode (active infusion or gravity infusion). The opening, closing, or adjustment of ultrasonic vibration includes opening or closing the vibration of the surgical instrument or instrument head associated with the ultrasonic module, and adjusting the vibration mode or vibration parameters of the surgical instrument or instrument head associated with the ultrasonic module. Vibration parameters can be ultrasonic power, ultrasonic energy, ultrasonic vibration interval time, cutting rate, vibration frequency and amplitude, pulse parameters (duty cycle, repetition frequency), etc.

[0019] In the field of ophthalmic surgery, there are usually devices and methods with different vibration modes such as axial vibration or torsion; for those skilled in the art, the usual ultrasonic energy output modes include, but are not limited to, continuous mode, pulse mode and burst mode.

[0020] As examples, common energy settings include linear, non-linear, and pulsed modes. Linear control modes are adjusted via control devices; for example, the surgeon changes the energy level by pressing a foot pedal at different positions. Non-linear control modes allow setting a pre-defined maximum energy value. Pulsed control modes deliver energy intermittently at a predetermined frequency. Some companies also offer a burst mode, which delivers a pre-set, large amount of energy over a short period, suitable for pulverizing harder cores.

[0021] The aforementioned preset conditions may include the identification of specific tissues in the image, the distance between the instrument tip and the specific tissue, and the identification of the properties of substances near the aspiration port, all based on the relationship between image recognition and preset conditions. The following examples specifically describe different OCT image signals emitted under different preset conditions.

[0022] Furthermore, processing the OCT images includes identifying at least one specific tissue and obtaining the minimum distance between the instrument tip and said specific tissue; the specific tissue can be: the iris, retina, or posterior capsule of the lens. Depending on the type of surgery, specific tissues requiring attention can be selected. For example, in posterior segment vitrectomy, special attention needs to be paid to the retinal tissue to avoid damage to the retina caused by the tip of the surgical instrument or the aspiration process.

[0023] In one implementation, a first threshold range is provided. When the minimum distance between the instrument tip and a specific tissue is within the first threshold range, a first OCT image signal is generated. Based on the first OCT image signal, a corresponding first control signal is generated. The first control signal is used to shut down the fluid aspiration of the perfusion / aspiration module and / or shut down the ultrasonic vibration of the ultrasound module. The first threshold range is a preset distance range, and different first threshold ranges can be set according to different specific tissues. The multiple threshold ranges described in this application can be combinations of parameter ranges set for different situations and should not be construed as a fixed single parameter range value.

[0024] In another implementation, a second threshold range is provided. When the minimum distance between the instrument tip and a specific tissue is within the second threshold range, at least one second OCT image signal is generated. Further, at least based on the second OCT image signal, a corresponding second control signal is generated. The second control signal controls the adjustment of the fluid suction pump, ensuring that the negative pressure value of the suction port end tubing is always lower than a second negative pressure value. And / or, the second control signal controls the mode or parameters of the ultrasonic vibration, wherein the second control signal at least controls the maximum energy of the ultrasonic vibration to be a second energy threshold. For example, refer to... Figure 2As shown, when the OCT image detects that the instrument tip is close to the corneal endothelium, a second OCT image signal is generated. The control module receives the second OCT image signal and controls the maximum energy threshold of the ultrasound module's ultrasonic vibration to decrease.

[0025] As one implementation method, the first threshold range and the second threshold range of the above embodiments can be included simultaneously, such that any value in the first threshold range is less than any value in the second threshold range. This allows different control methods, as described in the above embodiments, to be generated when the minimum distance between the instrument tip and the specific tissue is within different threshold ranges. In this application, such combinations of non-interfering embodiments should be understood as included in the disclosure of this application.

[0026] During ophthalmic surgery, the control module can receive flow or pressure information from the suction tubing, as well as OCT image signals, to adjust and control the fluid flow, especially the aspirated fluid flow. By using the pressure and / or flow information of the suction tubing, it can be determined whether the suction tubing is blocked. For example, when a peristaltic pump drives the suction tubing, if the negative pressure in the suction tubing reaches a certain threshold, it can be determined that the suction tubing is blocked. Alternatively, it can be determined by combining OCT image signals; for instance, if an OCT image identifies a hard nucleus of a certain size near the aspiration port, combined with the negative pressure in the suction tubing, it can be determined that the suction tubing is blocked.

[0027] As one implementation method, the flow pressure and / or flow rate information of the aspiration tubing is used to determine whether a blockage has occurred in the aspiration tubing; the properties of the substance near the intraocular aspiration port of the surgical instrument are identified based on the acquired OCT image; when the fluid flow blockage occurs, a third control signal is generated based on the properties of the substance near the aspiration port, and the third control signal is used to control the opening, closing, or adjustment of the fluid flow and / or ultrasonic vibration.

[0028] For example, combining the above, pressure and / or flow information from the aspiration tubing, along with OCT image signals, can indicate blockage in the aspiration tubing. When the aspiration tubing is blocked, maintaining a high negative pressure can easily lead to a sudden release of negative pressure, resulting in the aspiration of a large amount of intraocular fluid. In this case, by identifying the blockage signal and then adjusting the limits of negative pressure and flow, intraocular damage can be avoided. As an alternative, when a blockage in the aspiration tubing is detected, a pulsed or cyclic negative pressure control mode can be used, allowing the negative pressure to switch or shift between high and low values, thereby avoiding maintaining a high negative pressure value for an extended period.

[0029] As one implementation method, OCT images can be used to determine whether the blockage in the suction line has been cleared or is about to be cleared, thereby limiting excessively high negative pressure or flow rate in the suction line. For example, if a hard core material is identified near the suction port, and its size gradually decreases to a certain level, an OCT image signal is output, thereby limiting the negative pressure or flow rate of the suction line. In this way, the negative pressure during the suction process when blockage occurs can be appropriately increased, thus achieving better adsorption of hard core materials, while avoiding excessively high suction negative pressure or flow rate caused by the clearing of the blockage.

[0030] For example, when the material near the intraocular aspiration port of the surgical instrument is identified as iris tissue, the aspiration flow is immediately stopped or a return command is issued to reduce damage to the iris tissue. When the material near the intraocular aspiration port of the surgical instrument is identified as lens nucleus tissue with high hardness and large volume, the blockage of the aspiration tube can be effectively judged by combining the negative pressure information, and the threshold of negative pressure and ultrasonic energy can be appropriately increased.

[0031] Among them, identifying the properties of the substance near the intraocular suction port of the surgical instrument can include: identifying what kind of tissue the substance is, identifying the hardness of the substance, and identifying the size of the substance.

[0032] like Figure 3 As shown, in the case of identifying blockage in the suction tubing, one implementation method includes: S21: identifying at least one specific tissue based on the acquired OCT image, and obtaining the minimum distance between the instrument tip and the specific tissue; S22: having a fourth threshold range, generating a fourth OCT image signal when the minimum distance is within the fourth threshold range; S23: generating a corresponding fourth control signal based on the material properties near the suction port and the fourth OCT image signal.

[0033] For example, when aspiration tubing blockage occurs and the instrument tip is found to be close to the posterior capsule of the lens, aspiration operations must be performed with extreme caution to avoid eye damage. In this situation, the limits of negative pressure and ultrasonic energy need to be further reduced to prevent eye damage; furthermore, fluid flow aspiration and ultrasonic vibration can be directly shut off. In the event of blockage, the fourth threshold range should generally be larger than the distance between the first and second threshold ranges. In some cases, the surgeon may appropriately increase the negative pressure value to better aspirate large pieces of lens nucleus tissue; in the above situations, this should be restricted to guide the surgeon away from these sensitive areas during the surgical procedure.

[0034] OCT images can also be used to obtain changes in intraocular pressure (IOP) during surgery. Currently, IOP is mainly estimated by the flow rate and pressure (or intensity) of the aspiration and perfusion system, which can only indirectly reflect intraocular pressure. OCT scans, on the other hand, can observe the degree of closure of the anterior chamber angle in real time through tomographic imaging of the anterior chamber, and more intuitively detect fluctuations in IOP, greatly improving the accuracy of IOP estimation.

[0035] like Figure 4a and Figure 4b As shown, a real-time surgical field of view is acquired, and the outline of the eye field is obtained based on the eye, thereby acquiring a real-time OCT image at a specific location. Based on the real-time OCT image at this specific location, a real-time value is obtained. Based on the IOP value, the flow of fluid and / or the opening, closing, or adjustment of ultrasonic vibration are controlled. Through the OCT image at a specific location, the anterior chamber region in the image can be identified, and the anterior chamber volume can be segmented. The current IOP value is estimated using the anterior chamber volume. For example, a standard IOP value with a reference volume is set, and the current IOP value is obtained by the ratio of the current anterior chamber volume to the reference volume. The pressure or flow control of the infusion tubing can be adjusted based on the real-time IOP value to maintain stable intraocular pressure. Research and development analysis using OCT images requires tracking eye movements at the same specific location to ensure that the measurement of the anterior chamber volume is based on the same reference.

[0036] Since intraoperative navigation can be achieved by tracking the instrument tip and other parts in real time during surgery, the acquisition of OCT images is based on the moving parts such as the instrument tip. If it is necessary to track the changes of IOP through OCT images at the same time, it is often necessary to acquire additional real-time OCT images of specific locations. Different types of real-time OCT images can be acquired at intervals by setting the scanning parameters of the OCT module.

[0037] Optionally, in order to perform OCT image tracking and navigation simultaneously during surgery, an OCT module with independent 2 or more OCT optical paths can be used. By changing the OCT optical path through the galvanometer unit of the OCT module, real-time OCT images at different locations can be acquired independently.

[0038] As one implementation, a fifth threshold is also included. Based on the real-time IOP value, the real-time rate of change of the IOP value is obtained. When the rate of change of the IOP value is greater than the fifth threshold, the control module outputs a fifth control signal. This fifth control signal is used to shut down the fluid aspiration of the infusion / aspiration module and / or shut down the ultrasonic vibration of the ultrasound module. For example, when the rate of change of the IOP value is greater than the fifth threshold, i.e., when a sudden change occurs in intraocular pressure (generally a sudden drop), the control module controls the infusion / aspiration module to adjust the infusion pressure while simultaneously reducing the negative pressure limit of the aspiration module and the maximum power or energy of the ultrasonic vibration.

[0039] Optionally, according to embodiments of this application, when the minimum distance between the instrument tip and the specific tissue falls within different threshold ranges, a corresponding prompt message is issued. The prompt message can be an audible warning or a warning indicator superimposed on the frontal or cross-sectional field of vision (OCT image). Through alarms or prompts, the surgeon can be guided to adjust surgical parameters appropriately to perform the surgical procedure more safely.

[0040] Combination Figure 5 An exemplary ophthalmic surgical device is shown, including a control module, an infusion / aspiration module, and an ultrasound module; wherein the infusion / aspiration module also has sensors for measuring flow rate and / or pressure in the aspiration tubing; It also includes a surgical instrument with an instrument head that achieves ultrasonic vibration under the control of an ultrasound module. The surgical instrument has a suction port, through which fluid is aspirated under the control of an infusion / aspiration module. The surgical instrument also has an infusion port, through which fluid is infused into the eye under the control of an infusion / aspiration module to maintain intraocular pressure. The control module can receive OCT image signals, flow and / or pressure information from the aspiration module, and output control signals using the above-described control methods.

[0041] The aspiration port can be located on the instrument head. In operation, the aspiration port is connected to the aspiration tubing. The control module controls the aspiration pump to control the fluid flow and negative pressure of the entire aspiration tubing, thereby adjusting and controlling the fluid flow in the aspiration tubing. The irrigation port can generally be located at the irrigation cannula end of the surgical instrument. In operation, the irrigation port is connected to the irrigation tubing, thereby enabling the infusion of fluid into the eye to maintain intraocular pressure.

[0042] The control module can receive and process signals from OCT images and output control signals, thereby controlling the fluid flow of the aspiration / infusion module and the ultrasonic vibration of the ultrasonic module according to the control method described above.

[0043] The aforementioned ophthalmic surgical device may have a separate information processing module to receive and process OCT images to generate or emit OCT image signals; or it may have an interface to receive image processing signals from other surgical devices to adjust the control strategy of the control module.

[0044] This application also discloses an OCT module, wherein the OCT module has at least two independent OCT optical paths, and the scanning positions of different OCT optical paths are controlled separately by independent scanning units. With at least two independent OCT optical paths, OCT scans can be performed simultaneously on multiple different locations of the eye.

[0045] As one implementation method: This application discloses an OCT module with two OCT optical paths and two independent OCT scanning units. During the operation, one OCT scanning unit controls the corresponding OCT optical path to track the surgical instruments, and the other OCT scanning unit controls the corresponding OCT optical path to track a specific position of the eyeball to obtain the IOP value or reference value of the eye.

[0046] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0047] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of the invention pertain.

[0048] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

Claims

1. A control method based on optical coherence tomography, characterized in that: Obtain the surgical field of view and track the suction port or instrument tip of the intraocular end of the surgical instrument in real time, and perform OCT scanning based on the suction port or instrument tip to obtain OCT images; The OCT image is processed, and an OCT image signal is emitted according to preset conditions; Measure the flow rate and / or pressure in the suction line; At least based on the OCT image signal, a control signal is issued, which is used to control the opening, closing, or adjustment of fluid flow aspiration and / or ultrasonic vibration.

2. The control method according to claim 1, characterized in that: Based on the OCT image, at least one specific tissue is identified, and the minimum distance between the instrument tip and the specific tissue is obtained; It has a first threshold range, and, When the minimum distance is within the first threshold range, a first OCT image signal is generated; Based on the first OCT image signal, a corresponding first control signal is generated. The first control signal is used to turn off the fluid aspiration of the perfusion / aspiration module and / or turn off the ultrasonic vibration of the ultrasonic module.

3. The control method according to claim 1, characterized in that: Based on the OCT image, at least one specific tissue is identified, and the minimum distance between the instrument tip and the specific tissue is obtained; It has a second threshold range, and when the minimum distance is within the second threshold range, a second OCT image signal is generated; Based on the second OCT image signal, a corresponding second control signal is generated. The second control signal controls the adjustment of the liquid flow suction pump so that the negative pressure value of the suction port end pipe is always lower than the second negative pressure value. Alternatively, the second control signal controls the mode or parameters of ultrasonic vibration so that the maximum energy of ultrasonic vibration is the second energy threshold.

4. The control method according to claim 1, characterized in that: Determine whether a blockage has occurred in the suction line based on the flow pressure and / or flow rate information of the suction line. Based on the acquired OCT images, identify the properties of the substance near the intraocular aspiration port of the surgical instrument; When the fluid flow blockage occurs, a third control signal is generated based on the properties of the substance near the suction port. The third control signal is used to control the opening, closing, or adjustment of the fluid flow and / or ultrasonic vibration.

5. The control method according to claim 4, characterized in that: Identify the nature of substances near the intraocular aspiration port of surgical instruments, including identifying at least one of the following: Identify the type of tissue, hardness, and size of the substance.

6. The control method according to claim 4, characterized in that: Based on the acquired OCT images, at least one specific tissue is identified, and the minimum distance between the instrument tip and the specific tissue is obtained; It has a fourth threshold range, and when the minimum distance is within the fourth threshold range, a fourth OCT image signal is generated. Based on the properties of the substance near the suction port and the fourth OCT image signal, a corresponding fourth control signal is generated.

7. The control method according to claim 1 or 6, characterized in that: Based on the acquired surgical field of view, real-time OCT images of specific locations are acquired. Based on the real-time OCT images of specific locations, real-time IOP values ​​are acquired. Based on the IOP values, the flow of fluid and / or the ultrasonic vibration are controlled to be turned on, off, or adjusted.

8. The control method according to claim 7, characterized in that: It also has a fifth threshold, which obtains the real-time IOP value change rate based on the real-time IOP value. When the rate of change of the IOP value is greater than the fifth threshold, the control module outputs a fifth control signal, which is used to shut down the liquid flow aspiration of the infusion / aspiration module and / or shut down the ultrasonic vibration of the ultrasonic module.

9. An ophthalmic surgical device based on optical coherence tomography, characterized in that, It has a control module, an infusion / aspiration module, and an ultrasound module; The infusion / suction module also includes sensors for measuring flow rate and / or pressure in the suction line; It also includes a surgical instrument with an instrument head that achieves ultrasonic vibration under the control of an ultrasound module. The surgical instrument has a suction port, through which it aspirates fluid under the control of an infusion / aspiration module. The surgical instrument also has an infusion port, through which it infuses fluid into the eye under the control of an infusion / aspiration module to maintain intraocular pressure. The control module can receive OCT image signals, flow and / or pressure information from the aspiration module, and output control signals according to the control methods described in claims 1-8.

10. A computer-readable storage medium storing a computer program that, when executed, implements the control method according to any one of claims 1-8.

Images