Medical guide wire ultrasonic driver and transducer excitation control system
By combining a DC power supply module, a high-frequency transformer, an MCU control module, and a phase detection circuit, the problem of resonant frequency offset in existing technologies has been solved, enabling self-calibration matching of the medical guidewire ultrasonic driver and improving its adaptability and versatility.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-18
- Publication Date
- 2026-04-03
AI Technical Summary
Existing medical guidewire ultrasonic drivers and transducer excitation systems cannot dynamically change the drive signal frequency and duty cycle, resulting in resonant frequency shift and limiting their adaptability, especially when dealing with medical guidewires of different sizes.
The system employs a combination of a DC power supply module, a high-frequency transformer, an MCU control module, a MOS drive circuit, a transducer, an ultrasonic receiver, and a medical guidewire. The MCU control module adjusts the resonant frequency in real time, and the phase difference is detected by a phase detection circuit to achieve self-calibration and matching of the system.
It improves the adaptability of the transducer and the versatility of the drive system, solves the problem of resonant frequency shift caused by medical guidewires of different sizes, and realizes self-calibration matching in different environments.
Smart Images
Figure CN224070532U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the fields of ultrasound and electronic technology, and in particular relates to a medical guidewire ultrasonic driver and transducer excitation control system. Background Technology
[0002] A thrombus is a blood clot, usually composed of insoluble fibrin and blood cells, that obstructs blood flow in the circulatory system. Ultrasound technology is widely used in medical fields and is favored by hospitals worldwide due to its high efficiency and safety.
[0003] Traditional medical guidewires, in clinical practice, face challenges in clearing blood clots due to their mechanical properties and the degree of thrombus calcification. When encountering difficult-to-clear clots, surgical failure is a risk. Ultrasonic guidewire systems are designed to rapidly clear complex arterial blockages that cannot be treated with traditional guidewires. As a complementary treatment, ultrasonic guidewires rapidly penetrate calcified clots by transmitting ultrasonic vibrations, effectively improving the success rate of endovascular surgery and significantly reducing the risk of amputation.
[0004] Currently, the main solution for ultrasonic drivers and transducer excitation systems for medical guidewires is to use dedicated PWM chips as the driving source. The driving signal frequency and duty cycle of these chips cannot be dynamically changed, which makes it impossible to solve the problem of resonant frequency shift caused by changes in the size of medical guidewires. This limits the adaptability of ultrasonic drivers for medical guidewires as dedicated devices. Summary of the Invention
[0005] In view of this, the present invention aims to overcome the shortcomings of the above-mentioned problems in the prior art and proposes a medical guidewire ultrasonic driver and transducer excitation control system.
[0006] To achieve the above objectives, the technical solution of this utility model is implemented as follows:
[0007] A medical guidewire ultrasonic driver and transducer excitation control system includes a DC power supply module, a high-frequency transformer, an MCU control module, a transducer, an ultrasonic receiver, and a medical guidewire.
[0008] The DC power supply module is connected to a high-frequency transformer to convert DC power into high-voltage, high-frequency AC power. The DC power supply module is also connected to an MCU control module, which in turn is connected to a MOS drive circuit. The MOS drive circuit is connected to a MOS transistor totem pole, which is connected to a high-voltage frequency converter. The high-voltage frequency converter is also connected to a filter matching circuit, which is connected to a transducer. The transducer is connected to a medical guidewire. The high-frequency transformer is also connected to a current sampling circuit and a voltage inductance circuit. The current sampling circuit is connected to the MCU control module. The voltage inductance circuit is connected to a phase detection circuit, which is connected to the MCU control module. The filter matching circuit is connected to the phase detection circuit via a current sensing circuit. The medical guidewire is connected to the MCU control module via an ultrasonic receiver. The MCU control module contains a resonant self-calibration algorithm module.
[0009] Furthermore, the MCU control module is also connected to a PC and a display device to transmit the calculated display parameters to the display.
[0010] Furthermore, the DC power supply module includes:
[0011] DC step-down circuit connected to an external input power supply, low dropout linear regulator circuit, analog and digital power isolation circuit;
[0012] The DC voltage drop circuit includes a power supply filter circuit and a feedback calculation circuit. The input voltage is eliminated by the power supply filter circuit and then connected to the DC voltage drop circuit. The output of the DC voltage drop circuit is connected to the feedback calculation circuit. The feedback calculation circuit changes the output voltage value by adjusting the resistance value, which is used to provide a suitable voltage to the MCU control module and the high-frequency transformer.
[0013] The input voltage of the low dropout linear regulator circuit is provided by a DC dropout circuit, which converts the DC dropout voltage into a low-ripple power supply.
[0014] The analog and digital power isolation power supply uses the B0505XT power isolation chip to separate the input voltage into analog power and digital power. The analog power is used to power the high-frequency transformer, and the digital power is used to power the MCU control module.
[0015] Furthermore, the MOS driving circuit is used to provide driving signals to the MOS transistor totem pole and the high-frequency transformer to realize the conversion of DC signal to high-voltage high-frequency signal, including 2 optocouplers 6N137SDM, 2 S8050 transistors, and 1 MOS driving chip TC4427EOA.
[0016] Furthermore, the current sampling circuit includes a Hall sensor chip, a first-stage feedback amplifier circuit, and a second-stage feedback amplifier circuit.
[0017] Furthermore, the MOS transistor totem pole consists of six MOS transistors IRF840, which are divided into two groups: three MOS transistors are connected in parallel on the left and three on the right. The gate, source, and drain of the parallel MOS transistors are all connected together. The drains of the left group are connected to the high-frequency transformers.
[0018] Furthermore, the phase detection circuit is used to detect the phase difference between the voltage transformer circuit and the current transformer circuit, and outputs the phase difference as a pulse signal to the resonance self-calibration algorithm module. The phase difference before and after is obtained by calculating the pulse width of the pulse signal to find the resonant frequency.
[0019] Furthermore, the MCU control module includes a microcontroller chip.
[0020] Compared with the prior art, the medical guidewire ultrasonic driver and transducer excitation control system described in this utility model has the following advantages:
[0021] This invention has significant advantages in adaptability to different transducers. By changing the resonant frequency in real time through the MCU control module, the adaptability range of the transducer is greatly improved, and the versatility of the drive system is enhanced.
[0022] This invention achieves high and low voltage isolation through magnetic field mutual inductance and quickly locates the resonant point of the transducer based on the phase difference feedback in real time by the phase detection circuit. It solves the problem of resonant frequency shift caused by medical guide wires of different sizes and realizes self-calibration matching of the system under different environments. Attached Figure Description
[0023] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:
[0024] Figure 1 This embodiment provides a schematic diagram of the architecture of a medical guidewire ultrasonic driver and transducer excitation control system.
[0025] Figure 2 This embodiment provides a DC power supply module circuit diagram for a medical guidewire ultrasonic driver and transducer excitation control system.
[0026] Figure 3 This embodiment provides an analog and digital power isolation circuit diagram for a medical guidewire ultrasonic driver and transducer excitation control system.
[0027] Figure 4 This embodiment provides a circuit diagram of the MCU control module of a medical guidewire ultrasonic driver and transducer excitation control system.
[0028] Figure 5 This embodiment provides a MOS drive circuit diagram of a medical guidewire ultrasonic driver and transducer excitation control system.
[0029] Figure 6 This embodiment provides a current sampling circuit diagram for a medical guidewire ultrasonic driver and transducer excitation control system.
[0030] Figure 7 This embodiment provides a MOS transistor totem pole, high-frequency transformer, and filter matching circuit diagram for a medical guidewire ultrasonic driver and transducer excitation control system. Detailed Implementation
[0031] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.
[0032] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0034] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0035] In one embodiment, such as Figure 1As shown, this utility model provides a medical guidewire ultrasonic driver and transducer excitation control system, including a DC power supply module, a high-frequency transformer connected to the DC power supply module to convert DC power into high-voltage high-frequency AC power, an MCU control module connected to the DC power supply module as the core of system monitoring and control, a MOS drive circuit connected to the MCU control module to enhance the signal driving capability of the control module, a high-voltage, high-current-resistant N-channel MOS transistor totem pole connected to the MOS drive circuit, a high-frequency transformer with a custom winding connected to the MOS transistor totem pole, a voltage transformer circuit, a filter matching circuit and a current sampling circuit connected to the high-frequency transformer, an ultrasonic transducer and a current sensing circuit connected to the filter matching circuit, and a medical guidewire connected to the transducer.
[0036] In one embodiment, such as Figure 2 As shown, the DC power supply module includes: a DC step-down circuit connected to an external input power supply, a low-dropout linear regulator circuit, and an analog-to-digital power isolation circuit.
[0037] The DC voltage drop circuit includes a power supply filter circuit and a feedback calculation circuit. The input voltage is eliminated by the power supply filter circuit and then connected to the DC voltage drop circuit. The output of the DC voltage drop circuit is connected to the feedback calculation circuit. The feedback calculation circuit changes the output voltage value by adjusting the resistance value, which is used to provide a suitable voltage to the MCU control module and the high-frequency transformer.
[0038] The input voltage of the low dropout linear regulator circuit is provided by a DC buck circuit, which converts the DC dropout voltage into a low-ripple power supply.
[0039] like Figure 3 As shown, the analog and digital power isolation circuit uses the B0505XT power isolation chip to separate the input voltage into analog power and digital power. The analog power is used to power the high-frequency transformer, and the digital power is used to power the MCU control module.
[0040] In one embodiment, such as Figure 4 As shown, the MCU control module includes a microcontroller chip, and the MCU control module is connected to the current sampling circuit, voltage transformer circuit, current transformer circuit and MOS drive circuit.
[0041] In one embodiment, such as Figure 5As shown, the MOS driver circuit provides drive signals to the N-channel MOS totem-pole circuit and the high-frequency transformer circuit, realizing the conversion of DC signals to high-voltage, high-frequency signals. The MOS driver circuit consists of two 6N137SDM optocouplers, two S8050 transistors, and one MOS driver chip TC4427EOA. Pins 2 and 3 of the 6N137SDM optocouplers are connected to the MCU, pins 7 and 8 are connected to 5V, pin 6 is connected to the base of the S8050 via a current-limiting resistor, and pin 5 is grounded. The collector of the S8050 transistor is pulled up to 5V via a pull-up resistor and connected to pin 2 of the TC4427EOA MOS driver chip, while the emitter is directly grounded. When pins 2 and 3 of the optocoupler 6N137SDM are floating or pin 3 has a high input, pins 6 and 5 are in a high-impedance state. Pin 6 is pulled up to 5V by the pull-up resistor, the collector of the S8050 is high, the S8050 is turned on, and pin 2 of the MOS driver chip is pulled low, blocking the MOS driver chip's output. When pin 3 of the optocoupler 6N137SDM is low, pins 6 and 5 are on. Pin 6 is pulled down by the pull-up resistor, the collector of the S8050 is low, the S8050 is in a high-impedance state, pin 2 of the MOS driver chip is pulled high, and the MOS driver chip outputs voltage normally.
[0042] In one embodiment, such as Figure 6 As shown, the current sampling circuit includes a Hall effect sensor chip, a first-stage feedback amplifier circuit, and a second-stage feedback amplifier circuit. The Hall effect sensor chip CC6920SO has pins 1 and 2 input to the positive AC power supply, and pins 3 and 4 input to the negative AC power supply. It outputs the measured voltage amplitude based on the Hall effect sensing principle. The output voltage is connected from pin 7 (series resistor R112) to the positive input terminal of the first-stage feedback amplifier circuit, which uses a non-inverting amplifier circuit as a follower. The voltage at pin 1 of the first-stage feedback amplifier circuit is divided by resistors R128 and R129 and input to the positive input terminal of the second-stage feedback amplifier circuit. The second-stage feedback amplifier circuit also uses a non-inverting amplifier circuit as a follower, and its output is connected to the internal ADC acquisition module of the MCU control module.
[0043] In one embodiment, the voltage transformer circuit, the current transformer circuit, and the phase detection circuit are described. The voltage transformer circuit input is obtained by voltage division from the secondary coil of the high-frequency transformer, and the current transformer circuit input is obtained by the voltage output of the transformer. The current transformer circuit transmits the voltage and current to the phase detection circuit, which detects the phase difference between the voltage and current and transmits it to the MCU control module in the form of pulses to adjust the resonant frequency of the ultrasonic driver and transducer excitation control system in real time.
[0044] In one embodiment, such as Figure 7As shown, the high-voltage, high-current N-channel MOSFET totem pole configuration consists of six IRF840 MOSFETs. To increase current and reduce conduction losses and heat generation, the six MOSFETs are divided into two groups: three MOSFETs are connected in parallel on the left and three on the right. The gate, source, and drain of the parallel MOSFETs are all connected together. The drains of the left group are connected to pins 3 and 5 of the high-frequency transformer.
[0045] The high-frequency transformer with the custom winding uses the standard PQ3535 size. The primary winding is led out from pins 3, 4, and 5, connected in series with the same terminals. The winding between pins 3 and 4 is symmetrical to the winding between pins 4 and 5. The secondary winding is led out from pins 9 and 10 and connected to a high-voltage matching capacitor to improve the power factor of the circuit. Simultaneously, voltage sensing windings with the same terminals as pins 9 and 10 are led out from pins 11 and 12.
[0046] In one embodiment, the filter matching circuit is connected to the transducer input terminal to match the resonant impedance of the transducer, so that the transducer can output maximum power when in the resonant state.
[0047] In one embodiment, the ultrasound receiver is placed at the interface between the transducer and the medical guidewire to receive ultrasound echo signals. When the medical guidewire is in the blood vessel, the ultrasound receiver receives the echoes transmitted from the guidewire to the transducer probe. By analyzing the changes in the amplitude and velocity of the echo pulses, the structural information of the thrombus is obtained, and this information is transmitted to the MCU control module for processing.
[0048] In one embodiment, the MCU control module includes a resonance self-calibration algorithm module for finding the resonance frequency. The algorithm searches for the corresponding amplitude by stepping through a certain frequency step size, and compares the frequency corresponding to the maximum amplitude value as the resonance frequency.
[0049] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A medical guidewire ultrasonic actuator and transducer excitation control system, characterized in that: It includes a DC power supply module, a high-frequency transformer, an MCU control module, a transducer, an ultrasonic receiver, and a medical guidewire; The DC power supply module is connected to a high-frequency transformer to convert DC power into high-voltage, high-frequency AC power. The DC power supply module is also connected to an MCU control module, which in turn is connected to a MOS drive circuit. The MOS drive circuit is connected to a MOS transistor totem pole, which is connected to a high-voltage frequency converter. The high-voltage frequency converter is also connected to a filter matching circuit, which is connected to a transducer. The transducer is connected to a medical guidewire. The high-frequency transformer is also connected to a current sampling circuit and a voltage inductance circuit. The current sampling circuit is connected to the MCU control module. The voltage inductance circuit is connected to a phase detection circuit, which is connected to the MCU control module. The filter matching circuit is connected to the phase detection circuit via a current sensing circuit. The medical guidewire is connected to the MCU control module via an ultrasonic receiver. The MCU control module contains a resonant self-calibration algorithm module.
2. The medical guidewire ultrasonic driver and transducer excitation control system according to claim 1, characterized in that: The MCU control module is also connected to a PC and a display device to transmit the calculated display parameters to the display.
3. The medical guidewire ultrasonic driver and transducer excitation control system according to claim 1, characterized in that: The DC power supply module includes: DC step-down circuit connected to an external input power supply, low dropout linear regulator circuit, analog and digital power isolation circuit; The DC voltage drop circuit includes a power supply filter circuit and a feedback calculation circuit. The input voltage is eliminated by the power supply filter circuit and then connected to the DC voltage drop circuit. The output of the DC voltage drop circuit is connected to the feedback calculation circuit. The feedback calculation circuit changes the output voltage value by adjusting the resistance value, which is used to provide a suitable voltage to the MCU control module and the high-frequency transformer. The input voltage of the low dropout linear regulator circuit is provided by a DC dropout circuit, which converts the DC dropout voltage into a low-ripple power supply. The analog and digital power isolation power supply uses the B0505XT power isolation chip to separate the input voltage into analog power and digital power. The analog power is used to power the high-frequency transformer, and the digital power is used to power the MCU control module.
4. The medical guidewire ultrasonic driver and transducer excitation control system according to claim 1, characterized in that: The MOS driving circuit is used to provide driving signals to the MOS transistor totem pole and the high-frequency transformer to realize the conversion of DC signal to high-voltage high-frequency signal. It includes two optocouplers 6N137SDM, two S8050 transistors, and one MOS driving chip TC4427EOA.
5. The medical guidewire ultrasonic driver and transducer excitation control system according to claim 1, characterized in that: The current sampling circuit includes a Hall sensor chip, a first-stage feedback amplifier circuit, and a second-stage feedback amplifier circuit.
6. The medical guidewire ultrasonic driver and transducer excitation control system according to claim 1, characterized in that: The MOS transistor totem pole consists of six IRF840 MOS transistors, which are divided into two groups: three MOS transistors are connected in parallel on the left and three on the right. The gate, source, and drain of the parallel MOS transistors are all connected together. The drains of the left group are connected to the high-frequency transformers.
7. The medical guidewire ultrasonic driver and transducer excitation control system according to claim 1, characterized in that: The phase detection circuit is used to detect the phase difference between the voltage transformer circuit and the current transformer circuit. The phase difference is output to the resonance self-calibration algorithm module in the form of a pulse signal. The phase difference before and after is obtained by calculating the pulse width of the pulse signal, which is used to find the resonant frequency.
8. The medical guidewire ultrasonic driver and transducer excitation control system according to claim 1, characterized in that: The MCU control module includes a microcontroller chip.