Intravascular ultrasound device and system

Abstract

The invention provides an intravascular ultrasonic device and system, an ultrasonic acquisition module comprises an echo acquisition circuit, an amplitude limiting circuit and a conversion circuit, and the echo acquisition circuit acquires a voltage signal of an ultrasonic echo; the amplitude limiting circuit removes a part exceeding a voltage threshold value in the voltage signal so as to obtain a first electric signal; the conversion circuit receives the first electric signal and converts the first electric signal into an optical signal; the signal transmission module is used for receiving and transmitting optical signals; the signal conversion module receives the optical signal output from the signal transmission module and sequentially converts the optical signal into a second electric signal and a digital signal; and the signal processing module receives the digital signal output from the signal conversion module and determines an ultrasonic image according to the digital signal. The amplitude limiting circuit is arranged in the ultrasonic acquisition module, so that the ultrasonic emission signal can be effectively removed, and the condition that the ultrasonic emission signal is serially connected into the ultrasonic echo signal to cause device damage is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of intravascular imaging, and more particularly to an intravascular ultrasound device and system. Background Art

[0002] Due to clinical needs, the ultrasonic echo signals collected by an IVUS (Intravascular UltraSound) system are far from the IVUS host, and the distance generally exceeds 4 meters. Limited by the transducer volume, the ultrasonic echo signals are relatively weak, making it difficult for the system to transmit and collect effective signals. Currently, the main solutions adopted by IVUS systems are: (1) The acquisition module is placed in front, and after analog-to-digital conversion, it is transmitted to the host side; (2) The acquisition module is placed behind the host side, and the analog signal is transmitted to the host side, where analog-to-digital conversion and signal processing are performed at the host side.

[0003] However, for the first solution, its advantage is that it enhances the anti-interference ability of transmission. Its disadvantages are that on the one hand, the circuit is complex, and there are motors and slip rings in the driver, resulting in a large volume, which is not conducive to clinical operation; on the other hand, analog-to-digital conversion requires a high-speed clock, which is prone to heat dissipation and EMC (Electromagnetic Compatibility) problems. For the second solution, its disadvantage is that the echo signal is relatively weak, easily interfered by noise, and has a high transmission loss.

[0004] In addition, since the transmission line is shared for ultrasonic emission and acquisition, it is possible that the ultrasonic emission signal enters the ultrasonic echo acquisition module through this transmission line. Since the ultrasonic emission voltage is usually high, device damage is likely to occur in this module. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide an intravascular ultrasound device and system to reduce transmission loss and reduce the volume of devices.

[0006] In a first aspect, an embodiment of the present invention provides an intravascular ultrasound device, which includes an ultrasound acquisition module, a signal transmission module, a signal conversion module, and a signal processing module. The ultrasound acquisition module includes an echo acquisition circuit, a limiting circuit, and a conversion circuit. The echo acquisition circuit is used to acquire the voltage signal of the ultrasound echo. The limiting circuit is used to remove the part of the voltage signal that exceeds the voltage threshold, so as to obtain a first electrical signal. The conversion circuit is used to receive the first electrical signal and convert the first electrical signal into an optical signal. The voltage threshold is determined by the electronic components in the ultrasound device. The signal transmission module is used to receive and transmit the optical signal. The signal conversion module is used to receive the optical signal output from the signal transmission module and convert the optical signal into a second electrical signal and a digital signal in sequence. The signal processing module is used to receive the digital signal output from the signal conversion module and determine the ultrasound image according to the digital signal.

[0007] In an optional embodiment of the present application, the voltage amplitude range of the above-mentioned first electrical signal is between -5V and +5V.

[0008] In an optional embodiment of the present application, the above-mentioned limiting circuit includes a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first resistor, a second resistor, a first diode, and a second diode. The third capacitor, the first resistor, the first diode, the second resistor, and the fourth capacitor are connected in sequence. The first diode and the second diode are connected in parallel. The first capacitor is connected to the input end of the first diode, and the second capacitor is connected to the input end of the second diode. Both the third capacitor and the fourth capacitor are connected to the supply voltage at one end and grounded at the other end.

[0009] In an optional embodiment of the present application, the above-mentioned signal transmission module includes a voltage-current conversion circuit and a current-optical signal conversion circuit. The input end of the voltage-current conversion circuit is connected to the output end of the limiting circuit, and is used to receive the first electrical signal and convert the first electrical signal into a current signal. The current-optical signal conversion circuit is connected to the output end of the voltage-current conversion circuit, and is used to receive the current signal and convert the current signal into an optical signal.

[0010] In an optional embodiment of the present application, the above-mentioned voltage-current conversion circuit includes a DC bias source, a fifth capacitor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a triode, and an operational amplifier. The first end of the operational amplifier, the third resistor, and the base of the triode are connected in sequence. The collector of the triode is connected to the supply voltage, and the drain of the triode is connected to the current-optical signal conversion circuit. The second end of the operational amplifier, the sixth resistor, and one end of the fifth resistor are connected in sequence. The other end of the fifth resistor is grounded. The third end of the operational amplifier is connected to one end of the fourth resistor, and the other end of the fourth resistor is grounded. One end of the fourth resistor, the seventh resistor, the fifth capacitor, the DC bias source, and the other end of the fourth resistor are connected in sequence.

[0011] In an optional embodiment of the present application, the above-mentioned current-to-optical signal conversion circuit includes a laser; the voltage-to-current conversion circuit is used to control the output power of the laser through a current signal so that the laser outputs an optical signal.

[0012] In an optional embodiment of the present application, the above-mentioned signal conversion module includes a photodiode, a high-pass filter and an analog-to-digital converter; the photodiode is used to convert the optical signal into an electrical signal; the high-pass filter is used to filter the electrical signal after the DC light conversion generated by the DC bias in the electrical signal to obtain a second electrical signal; the analog-to-digital converter is used to convert the second electrical signal into a digital signal.

[0013] In a second aspect, an embodiment of the present invention further provides an intravascular ultrasound system, which includes: an ultrasound imaging catheter and the above-mentioned intravascular ultrasound device, wherein the ultrasound imaging catheter includes: an ultrasound transmitting module, which is used to transmit ultrasound signals outward.

[0014] In an optional embodiment of the present application, the above-mentioned intravascular ultrasound device also includes a driver, which includes: a motor drive module; the motor drive module is transmission-connected to the operating end of the ultrasound imaging catheter; the motor drive module is used to drive the ultrasound transducer arranged in the ultrasound imaging catheter to rotate relative to the catheter.

[0015] In an optional embodiment of the present application, the above-mentioned intravascular ultrasound device also includes: an ultrasonic driving module; the ultrasonic driving module is electrically connected to the ultrasonic transmitting module; the ultrasonic driving module is used to generate high-voltage pulses of a specific frequency to drive the ultrasonic transmitting module to emit ultrasonic signals.

[0016] The embodiments of the present invention bring the following beneficial effects:

[0017] The embodiment of the present invention provides an intravascular ultrasound device and system, which can effectively remove the ultrasound transmission signal by setting a limiting circuit in the ultrasound acquisition module, thereby preventing the ultrasound transmission signal from being mixed with the ultrasound echo signal and causing damage to the device.

[0018] Other features and advantages of the present disclosure will be set forth in the following description, or some features and advantages may be inferred or unambiguously determined from the description, or may be learned by implementing the above-mentioned technology of the present disclosure.

[0019] In order to make the above-mentioned objectives, features and advantages of the present disclosure more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 Schematic diagram of an intravascular ultrasound device provided by an embodiment of the present invention;

[0022] Figure 2 Schematic diagram of a passive limiter circuit provided by an embodiment of the present invention;

[0023] Figure 3 Schematic diagram of signal processing in an intravascular ultrasound device provided by an embodiment of the present invention;

[0024] Figure 4 Schematic diagram of an intravascular ultrasound system provided by an embodiment of the present invention;

[0025] Figure 5 Schematic diagram of another intravascular ultrasound system provided by an embodiment of the present invention. Specific embodiments

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions of the present invention with reference to the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0027] Currently, in existing intravascular ultrasound systems, the transmission line for ultrasonic wave emission and acquisition is shared. It is possible that the ultrasonic wave emission signal enters the ultrasonic echo acquisition module through this transmission line. Since the ultrasonic wave emission voltage is usually high, it is easy to cause component damage in this module.

[0028] The present invention provides an intravascular ultrasound device and system, specifically providing an implementation method for front-end data acquisition and transmission of an IVUS system, which can be applied to an interventional cardiovascular ultrasound real-time imaging system. It can not only reduce transmission loss, reduce the volume of components, lower the requirements for transmission cables and design complexity, but also prevent component damage.

[0029] To facilitate the understanding of this embodiment, first, a detailed introduction will be given to an intravascular ultrasound device disclosed in the embodiments of the present invention.

[0030] Embodiment 1:

[0031] This embodiment provides an intravascular ultrasound device. Refer to Figure 1 the schematic diagram of an intravascular ultrasound device shown. The intravascular ultrasound device includes: an ultrasound acquisition module, a signal transmission module, a signal conversion module, and a signal processing module.

[0032] The ultrasound emission module is used to emit ultrasonic signals outward; the ultrasound acquisition module includes an echo acquisition circuit, a voltage limiting circuit, and a conversion circuit. The echo acquisition circuit is used to acquire the voltage signal of the ultrasonic echo; the limiting circuit is used to remove the part of the voltage signal that exceeds the voltage threshold, so as to obtain a first electrical signal; the conversion circuit is used to receive the first electrical signal and convert the first electrical signal into an optical signal; the signal transmission module is used to receive and transmit the optical signal output from the conversion circuit; the signal conversion module is used to receive the optical signal output from the signal transmission module and convert it into a second electrical signal and a digital signal in sequence; the signal processing module is used to receive the digital signal output from the signal conversion module and obtain an ultrasonic image according to the digital signal.

[0033] The embodiment of the present invention provides an intravascular ultrasound device. By setting a limiting circuit in the ultrasound acquisition module, it can effectively remove the ultrasound emission signal and avoid the ultrasound emission signal from being mixed into the ultrasonic echo signal and causing device damage.

[0034] In this embodiment, the voltage signal of the ultrasonic echo collected can be limited by the limiting circuit, and the voltage signal can be controlled within the safe voltage range of this device, so as to avoid damage to electronic components caused by the intrusion of the ultrasonic signal.

[0035] Since the application environment of the IVUS system has various electronic devices and the electromagnetic interference is very severe, and in this embodiment, the optical signal is used for transmission, and the optical signal can be not interfered by other electromagnetic waves; on the other hand, it can also reduce the interference of the IVUS system to other devices. In addition, the optical fiber transmission loss is very low compared with the cable transmission, and the IVUS signal is relatively weak, which can reduce the requirements of the device for the transmission link.

[0036] Compared with directly transmitting electrical signals in the prior art, this embodiment can convert the electrical signal into an optical signal for transmission, thereby reducing electromagnetic interference during the transmission process and reducing transmission loss; at the same time, it reduces the interference of this device to other devices and reduces the volume of the device.

[0037] In some embodiments, the voltage amplitude range of the above first electrical signal is between -5V and +5V.

[0038] It should be noted that the voltage threshold in the limiting circuit of the present invention can be determined by the specifications of the subsequent electronic components in the device, and is usually set at the safe voltage value of the electronic components in the circuit.

[0039] Preferably, the limiting circuit is a passive limiting circuit. Active limiting can judge the signal arrival time or amplitude in advance, turn on the corresponding circuit, with slow response time, relatively small bandwidth, relatively large loss, and complex circuit design; the passive limiting adopted in this embodiment can fix the limiting value, with fast response time, small loss, large bandwidth, no intelligent judgment, and simpler and more stable circuit design. Refer to Figure 2 As shown in the schematic diagram of a passive limiting circuit, the above-mentioned limiting circuit includes: a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first resistor R1, a second resistor R2, a first diode D1, and a second diode D2; the third capacitor C3, the first resistor R1, the first diode D1, the second resistor R2, and the fourth capacitor C4 are connected in sequence, the first diode D1 and the second diode D2 are connected in parallel, the first capacitor C1 is connected to the input end of the first diode D1, and the second capacitor C2 is connected to the input end of the second diode D2; both ends of the third capacitor C3 and the fourth capacitor C4 are connected to the supply voltage VCC, and the other ends are grounded.

[0040] As Figure 2 shown, the first capacitor C1 and the second capacitor C2 can be input DC-blocking capacitors, the first resistor R1 and the second resistor R2 can be current-limiting resistors, and the third capacitor C3 and the fourth capacitor C4 can be bypass capacitors.

[0041] In some embodiments, the conversion circuit includes a voltage-current conversion circuit and a current-optical signal conversion circuit. Among them, the input end of the voltage-current conversion circuit is connected to the output end of the limiting circuit, and is used to receive the first electrical signal and convert the first electrical signal into a current signal; the current-optical signal conversion circuit is connected to the output end of the voltage-current conversion circuit, and is used to receive the above-mentioned current signal and convert the current signal into an optical signal.

[0042] Refer to Figure 3 As shown in the schematic diagram of signal processing in an intravascular ultrasound device, the voltage-current conversion circuit includes: a DC bias source V1, a fifth capacitor C5, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a triode Q1, and an operational amplifier; the first terminal 1 of the operational amplifier, the third resistor R3, and the base of the triode Q1 are connected in sequence, the collector of the triode Q1 is connected to the supply voltage VCC, and the drain of the triode Q1 is connected to the current-optical signal conversion circuit; the second terminal 2 of the operational amplifier, the sixth resistor R6, and one end of the fifth resistor R5 are connected in sequence, and the other end of the fifth resistor R5 is grounded; the third terminal 3 of the operational amplifier is connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 is grounded; one end of the fourth resistor R4, the seventh resistor R7, the fifth capacitor C5, the DC bias source V1, and the other end of the fourth resistor R4 are connected in sequence.

[0043] Among them, the fifth capacitor C5 can be a coupling capacitor, and the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, and the seventh resistor R7 can be proportional amplification control resistors. The DC bias voltage V1 is coupled into the device through the fifth capacitor C5.

[0044] Since the first electrical signal is a positive and negative voltage signal, while the power control current of the laser can only be a positive current. Therefore, a DC bias voltage is added to the input end of the VCCS (Voltage Controlled Current Source) control circuit to convert the echo signal into a positive voltage; then the biased echo signal passes through the VCCS circuit to be converted into a current signal.

[0045] In some embodiments, the current-optical signal conversion circuit includes a laser, and the voltage-current conversion circuit is used to control the output power of the laser through the current signal so that the laser outputs an optical signal.

[0046] Such as Figure 3 As shown, after the current signal enters the laser, it is converted into an optical signal. The current signal output from the voltage-current conversion circuit is input to the laser power control pin to control the internal power amplifier (current-type power amplifier) of the laser to adjust the output power of the laser, thereby controlling the laser signal.

[0047] Furthermore, the signal transmission module transmits the optical signal through a multimode optical fiber. The multimode optical fiber has less loss in transmitting the optical signal, thereby increasing the reliability of the imaging result.

[0048] Such as Figure 3 As shown, in some embodiments, the signal processing module includes a photodiode PD, a high-pass filter, and an analog-to-digital converter; among them, the photodiode is used to convert the optical signal into an electrical signal; the high-pass filter is used to filter the electrical signal converted from the DC light generated by the DC bias to obtain a second electrical signal; the analog-to-digital converter is used to convert the second electrical signal into a digital signal.

[0049] It should be noted that the second electrical signal obtained after passing through the high-pass filter is the electrical signal converted from the light generated by the echo after VCCS conversion.

[0050] The signal conversion module can perform analog-to-digital conversion through an ADC (Analog to Digital Converter). The AC echo signal can enter the AFE (Active Front End) circuit to achieve analog-to-digital conversion and output a digital signal.

[0051] Since there is a certain time difference between the emission time of the ultrasound and the reception time of the ultrasound echo, the present embodiment can remove the digital signal corresponding to the ultrasound from the digital signal according to the emission time point of the ultrasound, so that only the digital signal of the ultrasound echo is retained in the digital signal. The signal processing module can determine the ultrasound image based on the digital signal of the ultrasound echo to obtain an accurate ultrasound image.

[0052] In summary, the intravascular ultrasound device provided by the embodiment of the present invention has the following advantages:

[0053] (1) Transmission loss can be reduced and the size of the device can be reduced by transmitting optical signals.

[0054] (2) By setting a passive limiting circuit in the ultrasonic acquisition module, the ultrasonic echo and the ultrasonic wave that enters by mistake can be limited, thereby ensuring that the electronic components will not be damaged due to the excessive voltage of the input signal.

[0055] (3) According to the emission time point of the ultrasonic wave, the digital signal corresponding to the ultrasonic wave is removed from the digital signal, so that only the digital signal of the ultrasonic echo is retained in the digital signal. The signal processing module can determine the ultrasonic image based on the digital signal of the ultrasonic echo to obtain an accurate ultrasonic image.

[0056] Embodiment 2:

[0057] This embodiment provides an intravascular ultrasound system. Figure 4 A schematic diagram of an intravascular ultrasound system is shown, which includes an ultrasound imaging catheter and the intravascular ultrasound device provided by the aforementioned embodiment; the ultrasound imaging catheter includes: an ultrasound transmitting module, which is used to transmit ultrasound signals outward.

[0058] In some embodiments, the intravascular ultrasound device also includes a driver, which includes: a motor drive module; the motor drive module is transmission-connected to the operating end of the ultrasound imaging catheter; the motor drive module is used to drive the ultrasound transducer disposed in the ultrasound imaging catheter to rotate relative to the catheter.

[0059] See also Figure 5 Another schematic diagram of an intravascular ultrasound system is shown, the intravascular ultrasound system includes: an ultrasound imaging catheter, a driver and a host. The ultrasound imaging catheter includes: an ultrasound transmitting module; the driver includes: a signal conversion module and a signal transmission module; the host includes: an ultrasound acquisition module and a signal processing module.

[0060] An ultrasonic emission module is provided inside the ultrasonic imaging catheter. Among them, the ultrasonic emission module can be an ultrasonic transducer arranged at the end of the ultrasonic imaging catheter; the ultrasonic emission module can emit ultrasonic waves outward; it can also collect ultrasonic echo signals, and then output the ultrasonic echo signals to the driver through the coaxial cable inside the catheter.

[0061] As Figure 5 shown, the driver is provided with an ultrasonic acquisition module, a signal transmission module and a motor drive module. The signal conversion module is connected to the signal transmission module and is used to receive the optical signal output from the signal transmission module and convert it into a second electrical signal and a digital signal in sequence.

[0062] The ultrasonic acquisition module includes an echo acquisition circuit, a limiting circuit and a conversion circuit. The echo acquisition circuit is used to collect the voltage signal of the ultrasonic echo; the limiting circuit is used to remove the part of the voltage signal that exceeds the voltage threshold to obtain a first electrical signal; the conversion circuit is used to receive the first electrical signal and convert the first electrical signal into an optical signal, and the voltage threshold is determined by the electronic components in the ultrasonic device.

[0063] The signal transmission module includes an optical fiber connector for transmitting the optical signal to the host end.

[0064] The motor drive module is drivingly connected to the operating end of the ultrasonic imaging catheter and is used to drive the ultrasonic transducer arranged inside the catheter to rotate relative to the catheter, so that the ultrasonic transducer can emit ultrasonic signals 360°.

[0065] In some embodiments, the intravascular ultrasound device further includes: an ultrasonic drive module; the ultrasonic drive module is electrically connected to the ultrasonic emission module; the ultrasonic drive module is used to generate high-voltage pulses of a specific frequency to drive the ultrasonic emission module to emit ultrasonic signals.

[0066] As Figure 5 shown, the host is provided with an ultrasonic drive module, a signal conversion module and a signal processing module. The ultrasonic drive module is electrically connected to the ultrasonic emission module and is used to generate high-voltage pulses of a specific frequency to drive the ultrasonic emission module to emit ultrasonic signals.

[0067] The signal conversion module is connected to the signal transmission module and is used to receive the optical signal output from the signal transmission module and convert it into a second electrical signal and a digital signal in sequence; the signal processing module is used to receive the digital signal output from the signal conversion module.

[0068] The signal processing module is used to receive the digital signal output from the signal conversion module and obtain an ultrasonic image according to the digital signal.

[0069] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems and / or devices described above can refer to the corresponding processes in the foregoing embodiments, and will not be elaborated herein.

[0070] In addition, in the description of the embodiments of the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0071] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or a part of this technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in the various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs that can store program codes.

Claims

1. An intravascular ultrasound device, characterized in that, The intravascular ultrasound device includes: an ultrasound acquisition module, a signal transmission module, a signal conversion module, and a signal processing module; The ultrasound acquisition module includes an echo acquisition circuit, a limiting circuit, and a conversion circuit. The echo acquisition circuit is used to acquire the voltage signal of the ultrasound echo; the limiting circuit is used to remove the part of the voltage signal that exceeds the voltage threshold, so as to obtain a first electrical signal; the conversion circuit is used to receive the first electrical signal and convert the first electrical signal into an optical signal. The voltage threshold is determined by the electronic components in the ultrasound device; The signal transmission module is used to receive and transmit the optical signal; The signal conversion module is used to receive the optical signal output from the signal transmission module and convert the optical signal into a second electrical signal and a digital signal in sequence; The signal processing module is used to receive the digital signal output from the signal conversion module and determine the ultrasound image according to the digital signal.

2. The intravascular ultrasound device according to claim 1, wherein The voltage amplitude range of the first electrical signal is between -5V and +5V.

3. The intravascular ultrasound device according to claim 1, wherein The limiting circuit includes: a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first resistor, a second resistor, a first diode, and a second diode; The third capacitor, the first resistor, the first diode, the second resistor, and the fourth capacitor are connected in sequence. The first diode and the second diode are connected in parallel. The first capacitor is connected to the input end of the first diode, and the second capacitor is connected to the input end of the second diode; both the third capacitor and the fourth capacitor are connected to the supply voltage at one end and grounded at the other end.

4. The intravascular ultrasound device according to claim 1, wherein The signal transmission module includes a voltage-current conversion circuit and a current-optical signal conversion circuit; The input end of the voltage-current conversion circuit is connected to the output end of the limiting circuit, and is used to receive the first electrical signal and convert the first electrical signal into a current signal; The current-optical signal conversion circuit is connected to the output end of the voltage-current conversion circuit, and is used to receive the current signal and convert the current signal into an optical signal.

5. The intravascular ultrasound device according to claim 4, wherein, The voltage-current conversion circuit includes: a DC bias source, a fifth capacitor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a triode, and an operational amplifier; The first end of the operational amplifier, the third resistor, and the base of the triode are connected in sequence. The collector of the triode is connected to the supply voltage, and the drain of the triode is connected to the current-optical signal conversion circuit; The second end of the operational amplifier, the sixth resistor, and one end of the fifth resistor are connected in sequence. The other end of the fifth resistor is grounded; The third end of the operational amplifier is connected to one end of the fourth resistor, and the other end of the fourth resistor is grounded; one end of the fourth resistor, the seventh resistor, the fifth capacitor, the DC bias source, and the other end of the fourth resistor are connected in sequence.

6. The intravascular ultrasound device according to claim 4, wherein, The current-optical signal conversion circuit includes a laser; The voltage-current conversion circuit is used to control the output power of the laser through the current signal so that the laser outputs the optical signal.

7. The intravascular ultrasound device according to claim 1, characterized in that, The signal conversion module includes a photodiode, a high-pass filter, and an analog-to-digital converter; The photodiode is used to convert the optical signal into an electrical signal; the high-pass filter is used to filter the electrical signal after the DC light conversion generated by the DC bias in the electrical signal to obtain a second electrical signal; The analog-to-digital converter is used to convert the second electrical signal into a digital signal.

8. An intravascular ultrasound system, characterized in that, The intravascular ultrasound system comprises: an ultrasound imaging catheter and an intravascular ultrasound device according to any one of claims 1 to 7; The ultrasonic imaging catheter comprises an ultrasonic transmitting module, and the ultrasonic transmitting module is used to transmit ultrasonic signals outward.

9. The intravascular ultrasound system according to claim 8, wherein The intravascular ultrasound device further comprises a driver, which comprises: a motor drive module; the motor drive module is drivingly connected to the operating end of the ultrasound imaging catheter; The motor driving module is used to drive the ultrasonic transducer disposed in the ultrasonic imaging catheter to rotate relative to the catheter.

10. The intravascular ultrasound system according to claim 8, characterized in that, The intravascular ultrasound device further comprises: an ultrasound driving module; the ultrasound driving module is electrically connected to the ultrasound transmitting module; The ultrasonic driving module is used to generate high-voltage pulses of a specific frequency to drive the ultrasonic transmitting module to transmit ultrasonic signals.

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