Laser therapeutic instrument and control circuit and method thereof

Abstract

The invention provides a laser therapeutic instrument and a control circuit and method thereof. The laser therapeutic instrument comprises a laser, a microcontroller in communication connection with the laser and an optical shutter motor used for driving an optical shutter of the laser to be opened and closed, the control circuit comprises an on-off module and a driving module, and the on-off module is controlled by a control signal to be turned on or turned off so as to output an on-off signal; the control signal is output by the microcontroller based on the number of preheating laser pulses, the opening time of the optical shutter and the state of the laser; the driving module is used for configuring the voltage of an optical shutter motor control signal according to the turn-on or turn-off of the on-off module, and the optical shutter motor control signal is used for turning on or turning off the optical shutter motor. The laser shutter can be opened after the laser is preheated, so that the laser pulse emitted into the dot matrix scanning handle is uniform and stable, and the consistency of laser pulse energy in the treatment process is ensured.

Description

Technical Field

[0001] The present application relates to the field of laser control technology, and in particular to a laser therapeutic apparatus and a control circuit and method thereof. Background Art

[0002] In the laser medical industry, fractional erbium laser therapy devices are mainly used in clinical institutions. They use the interaction mechanism of intense pulsed fractional laser and human skin tissue to achieve skin peeling, treatment of acne scars, improvement of wrinkles and enlarged pores, etc. Indications include: skin peeling, improvement of wrinkles, acne scars, enlarged pores, etc.

[0003] The dot matrix scanning handle is a key component for realizing dot matrix scanning. It mainly realizes the scanning function through the galvanometer motor. Generally, the dot matrix scanning on the plane is realized by the combination of X motor and Y motor. The frequency of the galvanometer scanning is matched with the laser pulse frequency to output the laser, thereby realizing the output of the dot matrix laser. Then, it cooperates with the field mirror to make the light beam enter the specified focus normally and vertically. In layman's terms, the function of the field mirror is to focus the incident light beam on a light spot so that the focal length does not change with the deflection angle. Through the control program, a variety of specific patterns of dot matrix images and scanning sequences can be realized, such as square, circular, triangle, etc., or sequential scanning, or random scanning, etc.; usually, the laser pulse output and the position change of the scanning galvanometer are performed alternately, so as to realize the dot matrix flattening on the treatment surface.

[0004] Because many lasers, especially erbium lasers, have a certain degree of light output inconsistency when they are first turned on, as well as defects that vary from laser to laser. Even the number of pulses required for preheating and the time to open the light gate are inconsistent. This leads to poor light uniformity and stability when the laser is initially turned on, which in turn affects the effect of laser treatment. Summary of the invention

[0005] The technical problem to be solved by the present application is that the laser of the existing laser therapy device has poor light uniformity and stability in the initial start-up stage, which affects the laser treatment effect.

[0006] In order to solve the above-mentioned technical problems, the present application provides a control circuit of a laser therapy device, which includes a laser, a microcontroller connected to the laser for communication, and a shutter motor for driving the laser shutter to open and close; the control circuit includes an on-off module and a drive module, wherein the on-off module is controlled by a control signal to be turned on or off to output an on-off signal, and the control signal is output by the microcontroller based on the number of preheating laser pulses, the shutter opening time and the state of the laser; the drive module is used to configure the voltage of the shutter motor control signal according to the on or off of the on-off module, and the shutter motor control signal is used to turn on or off the shutter motor.

[0007] Optionally, the on-off module includes a photocoupler, which is configured with an anode pin, a cathode pin, an emitter pin and a collector pin; the anode pin is connected to a first power supply terminal, the cathode pin inputs the control signal, the emitter pin outputs the on-off signal, and the collector pin is connected to a second power supply terminal.

[0008] Optionally, the on-off module further includes a first resistor and a second resistor; the anode pin is connected to the first power supply terminal through the first resistor; and the cathode pin inputs the control signal through the second resistor.

[0009] Optionally, the driving module includes a relay, and the relay includes a relay coil, a first contact and a second contact; the relay coil is controlled by the on-off signal, the first contact is connected to the second power supply terminal, and the second contact is configured as a control output terminal for outputting a shutter motor control signal.

[0010] Optionally, the driving module also includes a third resistor, a fourth resistor, a diode and a transistor; wherein, one end of the third resistor inputs the on-off signal, and the other end is connected to the base of the transistor; the fourth resistor is connected between the base and the emitter of the transistor; the anode of the diode is connected to the collector of the transistor, and the cathode is connected to the second power supply terminal; the emitter of the transistor is connected to the first ground terminal; the anode and cathode of the diode are respectively connected to the two ends of the relay coil.

[0011] Optionally, if the shutter opening time point is earlier than the rising edge time of the light emitted from the first point of the laser scanning dot matrix, the shutter opening time is a negative value; if the shutter opening time point is later than the rising edge time of the light emitted from the first point of the laser scanning dot matrix, the shutter opening time is a positive value.

[0012] Optionally, the setting range of the preheating laser pulse number is less than or equal to 100; the setting range of the shutter opening time is -3276.8ms to 3276.7ms.

[0013] Optionally, the control circuit further comprises: a communication interface module connected to the laser, a communication protocol module for matching the microcontroller level and the communication protocol level, a dual-channel digital isolation module for isolating and protecting the laser input signal, and a power supply isolation module for voltage isolation;

[0014] The communication interface module is configured with a receiving pin, a sending pin and a grounding pin, the receiving pin is connected to the communication interface receiving end, the sending pin is connected to the communication interface sending end, and the grounding pin of the communication interface module is connected to the first ground end;

[0015] The communication protocol module is configured with a first receiving input pin, a first receiving output pin, a first sending input pin, a first sending output pin, a power pin and a ground pin, the first receiving input pin is connected to the communication interface receiving end, the first receiving output pin is connected to the communication protocol receiving end, the first sending input pin is connected to the communication protocol sending end, the first sending output pin is connected to the communication interface sending end, the power pin is connected to the first power end, the ground pin of the communication protocol module is connected to the first ground end, and a fifth capacitor is connected between the power pin and the ground pin of the communication protocol module;

[0016] The dual-channel digital isolation module is configured with a first-end power pin, a first-end ground pin, a second-end power pin, a second-end ground pin, a first-end input pin, a first-end output pin, a second-end input pin, and a second-end output pin, wherein the first-end power pin is connected to the first power end, the first-end ground pin is connected to the first ground end, the second-end power pin is connected to the isolated third power end, the second-end ground pin is connected to the second ground end, the first-end input pin is connected to the communication protocol receiving end, the first-end output pin is connected to the microcontroller receiving end, the second-end input pin is connected to the microcontroller sending end, the second-end output pin is connected to the communication protocol sending end, the first-end power pin is connected to the first ground end through a sixth capacitor, and the second-end power pin is connected to the second ground end through a seventh capacitor;

[0017] The power isolation module is configured with a voltage input pin, a voltage output pin, a ground pin and a 0V pin, the voltage input pin is connected to the third power supply terminal, the voltage output pin is connected to the isolated third power supply terminal, the ground pin is connected to the first ground terminal, the 0V pin is connected to the second ground terminal, the voltage input pin is connected to the first ground terminal through the eighth capacitor, and the voltage output pin is connected to the second ground terminal through the ninth capacitor and the tenth capacitor connected in parallel.

[0018] Optionally, the communication interface is an RJ45 interface, and the communication protocol is an RS232 protocol.

[0019] Optionally, the communication protocol module is also configured with a first capacitor positive pin, a first capacitor negative pin, a second capacitor positive pin, a second capacitor negative pin, a positive voltage pin and a negative voltage pin, the first capacitor positive pin and the first capacitor negative pin are respectively connected to the positive and negative electrodes of the first capacitor, the second capacitor positive pin and the second capacitor negative pin are respectively connected to the positive and negative electrodes of the second capacitor, the positive voltage pin is connected to the first ground terminal through a third capacitor, and the negative voltage pin is connected to the first ground terminal through a fourth capacitor.

[0020] In order to solve the above technical problems, the present application also provides a laser therapy device, including: a microcontroller, a laser, a shutter motor, a dot matrix scanning handle and the control circuit, wherein the dot matrix scanning handle is equipped with a laser incident port.

[0021] Optionally, the dot matrix scanning handle includes a diffraction optical element for splitting an incident single laser pulse beam into a uniform array beam.

[0022] Optionally, the laser therapy device further includes: a human-computer interaction module, used to input the number of preheating laser pulses and the shutter opening time.

[0023] Optionally, the human-computer interaction module is an LCD touch screen.

[0024] In order to solve the above technical problems, the present application also provides a control method for a laser therapy device, which includes a laser, a microcontroller connected to the laser for communication, and a shutter motor for driving the laser shutter to open and close. The control method includes: obtaining the state of the laser; outputting a control signal based on the number of preheating laser pulses, the shutter opening time and the state of the laser, and the control signal is used to control the shutter motor.

[0025] Optionally, the control method further includes: configuring a voltage of a shutter motor control signal based on the control signal, wherein the shutter motor control signal is used to turn on or off the shutter motor.

[0026] Optionally, the setting range of the preheating laser pulse number is less than or equal to 100; the setting range of the shutter opening time is -3276.8ms to 3276.7ms; if the shutter opening time point is earlier than the rising edge time of the first point of the laser scanning dot matrix, the shutter opening time is a negative value; if the shutter opening time point is later than the rising edge time of the first point of the laser scanning dot matrix, the shutter opening time is a positive value.

[0027] Compared with the prior art, the technical solution of the present application controls the on and off of the on / off module by changing the level of the control signal, so as to control the voltage change of the shutter motor control signal output by the driving module, and then controls the opening and closing of the shutter motor; wherein, the control signal is related to the number of preheating laser pulses, the shutter opening time and the state of the laser. Thus, the laser shutter can be opened after the laser preheating is completed, so that the laser pulses injected into the dot matrix scanning handle are uniform and stable, thereby ensuring the consistency of the laser pulse energy during the treatment process.

[0028] On the basis of controlling the laser shutter by the control circuit, the diffractive optical element beam splitting scheme is applied to the dot scanning handle, thereby realizing the output of multiple micro-dots in one laser pulse. This method not only greatly improves the uniformity and stability of the dot matrix, but also reduces the difference of mass-produced lasers and the energy loss in the laser beam splitting process, thereby indirectly reducing the energy consumption of the whole machine and increasing the life of the whole equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The following drawings describe in detail the exemplary embodiments disclosed in this application. The same reference numerals represent similar structures in several views of the drawings. Those skilled in the art will understand that these embodiments are non-limiting, exemplary embodiments, and the drawings are only used for the purpose of illustration and description, and are not intended to limit the scope of this application. Other embodiments may also accomplish the inventive intent in this application. It should be understood that the drawings are not drawn to scale. Among them:

[0030] Figure 1 A schematic diagram of the structure of a laser therapy device including a control circuit provided by the technical solution of the present application;

[0031] Figure 2 A schematic diagram of the circuit structure of a shutter motor control unit of a control circuit of a laser therapy device according to an embodiment of the present application;

[0032] Figure 3 A schematic diagram of the circuit structure of a signal conversion unit of a control circuit of a laser therapy device according to an embodiment of the present application;

[0033] Figure 4 A schematic diagram of the structure of a laser therapy device according to an embodiment of the present application;

[0034] Figure 5a A schematic diagram of the laser light path of a laser therapy device using a microlens array;

[0035] Figure 5b A schematic diagram of the laser light path of a laser therapy device using a diffractive optical element;

[0036] Figure 6 A flow chart of a control method of a laser therapy device provided by the technical solution of the present application;

[0037] Figure 7 Schematic diagram of the control method of the laser therapy device according to an embodiment of the present application. DETAILED DESCRIPTION

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0039] It should be understood that the "module" and "circuit" used herein are a method for distinguishing different components, elements, parts, portions or assemblies at different levels. However, if other words can achieve the same purpose, the words can be replaced by other expressions.

[0040] The terms used in this application are only used for the purpose of describing specific example embodiments and are not restrictive. For example, unless the context clearly indicates otherwise, the singular forms "one", "an" and "the" used here may also include plural forms. When used in this specification, the terms "include", "comprise" and / or "contain" mean that the associated integers, steps, operations, elements and / or components exist, but do not exclude the existence of one or more other features, integers, steps, operations, elements, components and / or groups or other features, integers, steps, operations, elements, components and / or groups can be added in the system / method. When describing the association of different components in this specification, it can be a direct relationship or an indirect relationship. For example, "A and B are connected" can be A and B directly connected, or A and B can be indirectly connected through other components.

[0041] In view of the following description, the operation and function of the related elements of the structure, the combination of parts and the economy of manufacturing can be significantly improved. With reference to the accompanying drawings, all of which form a part of the disclosure of this specification. However, it should be clearly understood that the drawings are only for the purpose of illustration and description and are not intended to limit the scope of the disclosure of this specification. Flowcharts are used in this application to illustrate the operations performed by the system according to the embodiments of the present application. It should be understood that the previous or following operations are not necessarily performed accurately in order. On the contrary, each step can be processed in reverse order or simultaneously. At the same time, other operations can also be added to these processes, or a certain step or several steps can be removed from these processes.

[0042] The following description provides specific application scenarios and requirements of the present application, with the purpose of enabling those skilled in the art to make and use the content in the present application. It will be apparent to those skilled in the art that various local modifications to the disclosed embodiments are apparent, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the present application. Therefore, the present application is not limited to the embodiments shown, but to the widest scope consistent with the claims.

[0043] Many lasers, especially erbium lasers, require a certain amount of time and pulses to warm up before emitting light. The laser warm-up process is the process of the system establishing balance. During this process, the energy of the laser pulse emitted by the laser increases from a small amount to a stable output. In order to ensure the consistency of the laser pulse energy during the treatment process, the laser pulse in this process should be blocked by the optical gate.

[0044] Therefore, before the laser is preheated, the laser shutter is set to the closed state for protection purposes; after the preheating is completed and the laser is in a state where it can emit light, the shutter is opened and the laser can emit light normally. Due to the differences between each laser, the number of pulses required for preheating and the time to open the shutter are not consistent.

[0045] Based on the above analysis, the technical solution of the present application provides a control circuit for a laser therapy device, which is used to control the laser of the laser therapy device in combination with two set parameters: the number of preheating laser pulses N before emitting light and the shutter opening time T after the galvanometer rotates.

[0046] Please refer to Figure 1 The laser therapy device includes a laser, a microcontroller connected to the laser for communication, and a shutter motor for driving the laser shutter to open and close; the control circuit includes an on-off module and a drive module, wherein the on-off module is controlled by a control signal to be turned on or off to output an on-off signal; the control signal shutter is output by the microcontroller based on the number of preheating laser pulses N, the shutter opening time T and the state of the laser; the drive module is used to configure the voltage of the shutter motor control signal SRD-05VDC-SL-C according to the on or off of the on-off module, and the shutter motor control signal is used to turn on or off the shutter motor.

[0047] The on-off module has voltage conversion and isolation effects, and may include switching devices, such as photoelectric couplers, relays, voltage isolators, PNP transistors, NPN transistors, etc. Taking the switching device as a photoelectric coupler as an example, the photoelectric coupler is configured with an anode pin, a cathode pin, an emitter pin and a collector pin; the anode pin is connected to the first power supply terminal, the cathode pin is connected to the control input terminal (i.e., the input control signal), the emitter pin outputs the on-off signal, and the collector pin is connected to the second power supply terminal. The voltage of the first power supply terminal matches the input terminal voltage in actual application, and the voltage of the second power supply terminal matches the output terminal voltage in actual application (such as the driving voltage of the light gate motor).

[0048] Photocoupler (abbreviated as optocoupler) is a device that assembles light-emitting devices (such as light-emitting diodes) and photosensitive devices (such as phototransistors) together, and realizes coupling through optical fibers to form an electrical-optical and optical-electrical conversion device. When an electrical signal is sent to the input end of the photocoupler, the light-emitting diode emits light through the current, and the photosensitive element generates current after being illuminated by light, and CE is turned on; when there is no signal at the input end, the light-emitting diode does not light up, the phototransistor is cut off, and CE is not connected (turned off).

[0049] Generally, the shutter motor requires a large current to drive, and in order to cooperate with the switching device of the on-off module, the driving module may include a relay, which includes a relay coil, a first contact and a second contact; the relay coil is controlled by the on-off signal, the first contact is connected to the second power supply terminal, and the second contact is configured as a control output terminal for outputting the shutter motor control signal.

[0050] A relay is an electrical control device that causes a predetermined step change in the controlled quantity in the electrical output circuit when the change in the input quantity (excitation quantity) reaches the specified requirement. It has an interactive relationship between the control system (also known as the input circuit) and the controlled system (also known as the output circuit). A relay is actually an "automatic switch" that uses a small current to control the operation of a large current, and plays the role of automatic adjustment, safety protection, and circuit conversion in the circuit.

[0051] Furthermore, according to the devices used in the on-off module and the driving module, circuit elements and peripheral circuits suitable for the devices can be selected and matched. The specific implementation of the control circuit is described in detail below by taking the on-off module including a photocoupler and the driving module including a relay as an example.

[0052] Please refer to Figure 2The control circuit of the laser therapy device in this embodiment includes a shutter motor control unit, wherein the shutter motor is used to drive the laser shutter to open and close; the shutter motor control unit includes an on-off module and a drive module; the on-off module includes: a photocoupler U4, a first resistor R1 and a second resistor R2; the drive module includes: a third resistor R3, a fourth resistor R4, a diode D1, a transistor Q1 and a relay K1.

[0053] The photocoupler U4 is configured with an anode pin d+, a cathode pin d−, an emitter pin e0 and a collector pin c0; the relay K1 includes a relay coil L1, a first contact a1 and a second contact a2.

[0054] The first resistor R1 is connected between the first power supply terminal VCC1 and the anode pin d+, that is, the anode pin d+ is connected to the first power supply terminal VCC through the first resistor R1; the second resistor R2 is connected between the control input terminal shutter and the cathode pin d-, that is, the cathode pin d- inputs the control signal through the second resistor R2.

[0055] The first resistor R1 and the second resistor R2 are current limiting resistors, which are used to ensure the normal operation of the control input terminal shutter of the photoelectric coupler U4. In other embodiments, other protection circuits with equivalent functions can also be used to protect the input terminal of the photoelectric coupler U4.

[0056] The emitter pin e0 outputs an on-off signal; one end of the third resistor R3 inputs the on-off signal, and the other end is connected to the base b of the transistor Q1, that is, the third resistor R3 is connected between the emitter pin e0 and the base b of the transistor Q1; the fourth resistor R4 is connected between the base b and the emitter e of the transistor Q1; the collector pin c0 is connected to the second power supply terminal VCC2; the anode of the diode D1 is connected to the collector c of the transistor Q1, and the cathode is connected to the second power supply terminal VCC2; the emitter e of the transistor Q1 is connected to the first ground terminal GNDA; the anode and cathode of the diode D1 are respectively connected to the two ends of the relay coil L1, and the first contact a1 is connected to the second power supply terminal VCC2.

[0057] The third resistor R3 and the fourth resistor R4 are voltage-dividing resistors, which are used for voltage division and current shunting to protect the transistor Q1. The diode D1, the relay K1 and the transistor Q1 form a circuit loop closed-loop system to strengthen the protection of the K1 relay. When the photocoupler U4 is cut off (turned off), the diode D1 gives a high level to the collector c of the transistor Q1, making it in an inoperative state, and the shutter motor does not work; when the photocoupler U4 is turned on, the transistor Q1 is turned on at a low level, realizing the action of the relay K1, and the voltage of the shutter motor control signal SRD-05VDC-SL-C = the voltage of the second power supply terminal VCC2, and then the shutter motor works. In other embodiments, other protection circuits with equivalent functions can also be used to protect the relay K1.

[0058] The control signal of the control input terminal shutter is output by a microcontroller (MCU) based on the number of preheating laser pulses N, the shutter opening time T and the state of the laser; the second contact a2 is configured as a control output terminal for outputting the shutter motor control signal SRD-05VDC-SL-C.

[0059] In this embodiment, the voltage of the first power supply terminal VCC1 matches the input voltage of the optocoupler, for example, it can be 3.3V, and the voltage of the second power supply terminal VCC2 matches the driving voltage of the shutter motor, that is, it can drive the shutter motor, for example, it can be 24V.

[0060] In addition, connector P2 is a connection terminal with the shutter motor, pin 1 of connector P2 is connected to the first ground terminal GNDA, and pin 2 of connector P2 is connected to the second contact a2. In this embodiment, the device model used by the photocoupler U4 is EL357N, and the device model used by the connector P2 is CH-3.96-2P. The device model is only used as an example of practical application. Those skilled in the art can understand that in other embodiments, devices with the same or similar functions can be used as substitutes under the premise of achieving equivalent functions.

[0061] The microcontroller communicates with the laser to obtain the status of the laser (including: laser start / stop, number of laser pulses after start, connection, frequency, pulse width, on / off pre-ignition, mode, fault, on / off LD, etc.), and then outputs a control signal to the control input terminal shutter of the shutter motor control unit according to the preset number of preheating laser pulses N and the shutter opening time T. The shutter motor control unit controls the conduction and closing of the photoelectric coupler U4 by controlling the two level changes of the control signal at the input terminal shutter, thereby controlling the second contact a2 of the relay K1, that is, the two voltage changes of the shutter motor control signal SRD-05VDC-SL-C output from the control output terminal, SRD-05VDC-SL-C=24V or 0V, corresponding to the opening and closing of the shutter motor respectively.

[0062] The number of preheating laser pulses N is determined by the time of the laser preheating process. The preheating time multiplied by the laser frequency is the N value. The preheating time of each laser will be different, so this N value is determined by testing during debugging. The setting range of the number of preheating laser pulses N can be less than or equal to 100, that is, it is adjustable from 0 to 100. T is the time when the shutter is opened after the pedal is stepped on. Its logic is: when T = 0, the shutter opening time point is equal to the rising edge time of the first point of the dot matrix; if the shutter opening time point is earlier than the rising edge time of the first point of the laser scanning dot matrix, the shutter opening time T is a negative value, and if the shutter opening time point is later than the rising edge time of the first point of the laser scanning dot matrix, the shutter opening time T is a positive value. For example, when T = -10, the shutter opening time point is 1.0ms earlier than the rising edge time of the first point of the dot matrix; when T = 10, the shutter opening time point is 1.0ms later than the rising edge time of the first point of the dot matrix. The shutter opening time T setting range is adjustable from -3276.8 to 3276.7 ms.

[0063] Furthermore, the microcontroller establishes a communication connection with the laser, and the state of the laser is obtained through the communication signal. For example, the microcontroller communicates with the laser through RS232, RS458, CAN, RJ45, etc. When the signal of the microcontroller does not match the communication signal, such as the signal of the microcontroller is usually a TTL signal, and the communication signal is an RS232 signal (the communication connection method between the microcontroller and the laser adopts the RS232 communication protocol), in order for the microcontroller to be able to identify it, level conversion is required. Therefore, the control circuit of the laser therapy instrument in this embodiment also includes a signal conversion unit.

[0064] Please refer to Figure 3 The signal conversion unit includes: a communication interface module P1 connected to the laser, a communication protocol module U1 for matching the microcontroller level and the communication protocol level, a dual-channel digital isolation module U2 for isolating and protecting the laser input signal, and a power isolation module U3 for voltage isolation.

[0065] The communication interface module P1 is configured with a receiving pin (pin 1), a sending pin (pin 2) and a ground pin (pin 3). The receiving pin is connected to the communication interface receiving terminal RJ45-RX, the sending pin is connected to the communication interface sending terminal RJ45-TX, and the ground pin of the communication interface module P1 is connected to the first ground terminal GNDA.

[0066] The communication protocol module U1 is configured with a first receiving input pin R1IN, a first receiving output pin R1OUT, a first transmitting input pin T1IN, a first transmitting output pin T1OUT, a power pin VCC and a ground pin GND. The first receiving input pin R1IN is connected to the communication interface receiving end RJ45-RX, the first receiving output pin R1OUT is connected to the communication protocol receiving end RS232-RXD, the first transmitting input pin T1IN is connected to the communication protocol transmitting end RS232-TXD, the first transmitting output pin T1OUT is connected to the communication interface transmitting end RJ45-TX, the power pin VCC is connected to the first power terminal VCC1, the ground pin GND of the communication protocol module U1 is connected to the first ground terminal GNDA, and a fifth capacitor C5 is connected between the power pin VCC and the ground pin GND of the communication protocol module U1. The communication protocol module U1 realizes the level conversion of the microcontroller signal and the communication signal.

[0067] The dual-channel digital isolation module U2 is configured with a first-end power pin VDD1, a first-end ground pin GND1, a second-end power pin VDD2, a second-end ground pin GND2, a first-end input pin ViA, a first-end output pin VoA, a second-end input pin ViB and a second-end output pin VoB. The first-end power supply pin VDD1 is connected to the first power supply terminal VCC1, the first-end ground pin GND1 is connected to the first ground terminal GNDA, the second-end power supply pin VDD2 is connected to the isolated third power supply terminal ISO_VCC3, the second-end ground pin GND2 is connected to the second ground terminal GNDB, the first-end input pin ViA is connected to the communication protocol receiving terminal RS232-RXD, the first-end output pin VoA is connected to the microcontroller receiving terminal RJ45-RXPA2, the second-end input pin ViB is connected to the microcontroller transmitting terminal RJ45-TXPA2, the second-end output pin VoB is connected to the communication protocol transmitting terminal RS232-TXD, the first-end power supply pin VDD1 is connected to the first ground terminal GNDA through the sixth capacitor C6, and the second-end power supply pin VDD2 is connected to the second ground terminal GNDB through the seventh capacitor C7. The microcontroller receiving terminal RJ45-RXPA2 is connected to the microcontroller through the connection terminal TP1, and the microcontroller transmitting terminal RJ45-TXPA2 is connected to the microcontroller through the connection terminal TP2.

[0068] The power isolation module U3 is configured with a voltage input pin Vin, a voltage output pin +Vo, a ground pin GND and a 0V pin. The voltage input pin is connected to the third power supply terminal VCC3, the voltage output pin +Vo is connected to the isolated third power supply terminal ISO_VCC3, the ground pin GND is connected to the first ground terminal GNDA, the 0V pin is connected to the second ground terminal GNDB, the voltage input pin Vin is connected to the first ground terminal GNDA through the eighth capacitor C8, and the voltage output pin +Vo is connected to the second ground terminal GNDB through the ninth capacitor C9 and the tenth capacitor C10 connected in parallel.

[0069] In this embodiment, the voltage of the third power supply terminal is 5V, and the voltage of the isolated third power supply terminal is 5V; the first ground terminal GNDA is a digital ground or a logic ground, and the second ground terminal GNDB is an analog ground.

[0070] Taking the communication interface as RJ45 interface and the communication protocol as RS232 protocol as an example, in this embodiment, the communication interface module P1 is a connector, and the device model used is XH3A, the device model used by the communication protocol module U1 is MAX3232EUE, the device model used by the dual-channel digital isolation module U2 is ADUM1201, and the device model used by the power isolation module U3 is IF0505XT-1WR3. The device model is only used as an example of practical application. Those skilled in the art can understand that in other embodiments, under the premise of achieving equivalent functions, devices with the same or similar functions can be used instead.

[0071] Devices of different models have slightly different peripheral circuits. The communication protocol module U1 of this embodiment is also configured with a first capacitor positive electrode pin C1+, a first capacitor negative electrode pin C1-, a second capacitor positive electrode pin C2+, a second capacitor negative electrode pin C2-, a positive voltage pin VS+, and a negative voltage pin VS-. The first capacitor positive electrode pin C1+ and the first capacitor negative electrode pin C1- are respectively connected to the positive electrode and the negative electrode of the first capacitor C1, the second capacitor positive electrode pin C2+ and the second capacitor negative electrode pin C2- are respectively connected to the positive electrode and the negative electrode of the second capacitor C2, the positive voltage pin VS+ is connected to the first ground terminal GNDA through the third capacitor C3, and the negative voltage pin VS- is connected to the first ground terminal GNDA through the fourth capacitor C4.

[0072] In the signal conversion unit, the laser transmits the RS232 protocol of the laser to the communication protocol module U1 through the communication interface receiving terminal RJ45-RX and the communication interface transmitting terminal RJ45-TX of the communication interface module P1, converts the RS232 level into the TTL level through the communication protocol module U1, and then transmits the serial port protocol to the microcontroller through the communication protocol receiving terminal RS232_RXD and the communication protocol transmitting terminal RS232_TXD, the dual-channel digital isolator U2, the microcontroller receiving terminal RJ45-RXPA2 and the microcontroller transmitting terminal RJ45-TXPA2, so that the microcontroller obtains the status of the laser.

[0073] Please refer to Figure 4 The embodiment of the present application also provides a laser therapy device, including: a microcontroller, a laser, a shutter motor, a dot matrix scanning handle and the aforementioned control circuit, wherein the dot matrix scanning handle is configured with a laser incident port.

[0074] The laser is connected to the dot matrix scanning handle and the microcontroller respectively, and the microcontroller obtains the state of the laser and controls the shutter motor through the control circuit. After the shutter motor drives the laser shutter to open, the laser pulse emitted by the laser is injected through the laser incident port of the dot matrix scanning handle.

[0075] Furthermore, the dot matrix scanning handle includes a diffractive optical element (DOE), such as a DOE diffractive lens, which is used to split the incident laser single pulse beam into a uniform array beam.

[0076] Most existing dot matrix scanning handles use a laser pulse to complete a point in the dot array, with low scanning efficiency. It usually takes several seconds to complete the scanning of a group of spots. Since the handle is handheld, a single set of dots takes too long, which can easily cause arm fatigue and unstable handholding, resulting in misalignment of the treatment area, uneven treatment, affected treatment effects or skin damage.

[0077] The existing solution is to place a microlens array at the laser entrance of the handle to split and focus the laser beam, and then control the galvanometer motor and the deflection of the lens to achieve the effect of a single laser pulse outputting multiple array points. Figure 5aAfter the laser beam 1' is incident on the microlens array 2', an m×n dot matrix light spot is formed at the focal plane of the microlens; the dot matrix light spot is imaged onto the treatment surface 6 through the field lens 5, forming m×n identical focused light spots. However, as can be seen from the figure, the disadvantage of this method is that the pulse energy output loss after passing through the microlens array 2' is large, and some even have only 30% of the energy output, and the remaining energy is absorbed by the microlens structure and dissipated in the form of heat; and this type of microlens structure is relatively small, the processing and manufacturing process is difficult, the assembly precision requirements are high, and the assembly is difficult. Due to the limitation of the process, the number of microlens arrays cannot be very dense, and is generally 2×2, 3×3 or 4×4, etc., which to a certain extent limits the improvement of its scanning efficiency.

[0078] The dot scanning handle of this embodiment uses a diffractive optical element to split the incident laser beam. Depending on the model, m×n (m, n are integers greater than or equal to 1) sub-laser beams can be emitted. Please refer to Figure 5b After the laser beam 1 is incident on the DOE beam splitter 2, m×n sub-laser beams are emitted; the emitted sub-laser beams are focused on the treatment surface 6 by the field lens 5, forming m×n identical focused light spots. It can be seen that the pulse energy output after passing through the DOE beam splitter 2 has almost no loss.

[0079] It should be noted that, in order to clearly compare the microlens array 2' and the DOE beam splitter element 2, Figure 5a The laser optical path omits the X-dimensional scanning galvanometer and the Y-dimensional scanning galvanometer disposed between the microlens array 2' and the field lens 5. Figure 5b The laser optical path omits the X-dimensional scanning galvanometer and the Y-dimensional scanning galvanometer arranged between the DOE beam splitter element 2 and the field lens 5. The X-dimensional scanning galvanometer and the Y-dimensional scanning galvanometer only change the propagation direction of the light beam and do not affect the sub-laser beam emitted by the microlens array 2' or the DOE beam splitter element 2 and focused to the light spot on the treatment surface 6 through the field lens 5.

[0080] The laser shutter is controlled by the control circuit, and on this basis, the DOE diffraction lens beam splitting solution is applied to the dot scanning handle, thereby achieving multiple micro-dots output from one laser pulse. This method not only greatly improves the uniformity and stability of the dot matrix, but also reduces the differences in mass-produced lasers and the energy loss in the laser beam splitting process.

[0081] Please still refer to Figure 4 The laser therapeutic apparatus of this embodiment further includes a human-computer interaction module for inputting the preheating laser pulse number N and the shutter opening time T. The human-computer interaction module may be an LCD touch screen, and the microcontroller obtains the preheating laser pulse number N and the shutter opening time T through the LCD touch screen.

[0082] In practical applications, the laser therapy device of this embodiment may further include a power management module, an energy regulation module, an aiming light module, and a peripheral interface.

[0083] The power management module supplies power to the microcontroller to meet the different power requirements of each module. The microcontroller is connected to the laser through an RJ45 standard interface, realizes laser output with different parameters through RS232 half-duplex communication, and monitors the status of the laser in real time.

[0084] The energy regulation module adjusts the energy of a single laser pulse by controlling the encoder and the stepper motor. The energy regulation module transmits the energy control data to the microcontroller in the form of serial port protocol data, and the microcontroller transmits the energy control data to the laser in the RS232 half-duplex mode. The laser adjusts the energy of the single laser pulse it emits according to the energy control data.

[0085] The aiming light module adjusts the aiming light intensity through pulse width modulation (PWM) adjustment technology. The aiming light module transmits aiming light intensity control data to the microcontroller in the form of serial port protocol data, and the microcontroller adjusts the aiming light according to the visible intensity of the aiming light, and then adjusts the aiming light accordingly by observing the visible light intensity with the naked eye.

[0086] The microcontroller can detect the states of the light shutter, foot switch, interlock switch, etc. when the system is running through the peripheral interface to ensure the safety of the system operation.

[0087] Based on the above-mentioned laser therapy device and its control circuit, the technical solution of the present application also provides a control method of the laser therapy device, wherein the laser therapy device includes a laser, a microcontroller connected to the laser for communication, and a shutter motor for driving the laser shutter to open and close; the control method is as follows Figure 6 As shown, it includes: obtaining the state of the laser; outputting a control signal based on the number of preheating laser pulses, the shutter opening time and the state of the laser, and the control signal is used to control the shutter motor.

[0088] Specifically, when the laser is in a preheating state, that is, the number of laser pulses after startup has not reached the preheating laser pulse number, a control signal for controlling the shutter motor to close is output; when the number of laser pulses after the laser is started reaches the preheating laser pulse number, the time for outputting the control signal for controlling the shutter motor to open is determined according to the shutter opening time.

[0089] The shutter opening time can be set as follows: if the shutter opening time point is earlier than the rising edge time of the first point of the laser scanning dot matrix, the shutter opening time is a negative value; if the shutter opening time point is later than the rising edge time of the first point of the laser scanning dot matrix, the shutter opening time is a positive value. In an actual application example, the setting range of the preheating laser pulse number is less than or equal to 100; the setting range of the shutter opening time is -3276.8ms to 3276.7ms.

[0090] Furthermore, when the voltage of the control signal does not match the drive voltage of the shutter motor, such as the voltage of the control signal is not enough to drive the shutter motor, please refer to Figure 7 In the embodiment flow chart shown, the control method may further include: configuring the voltage of the shutter motor control signal based on the control signal, and the shutter motor control signal is used to turn on or off the shutter motor. Specifically, when the control signal indicates that the shutter motor is controlled to be turned on, the voltage of the shutter motor control signal is configured to be a high level, such as 24V; when the control signal indicates that the shutter motor is controlled to be turned off, the voltage of the shutter motor control signal is configured to be a low level, such as 0V.

[0091] In summary, after reading the contents of this application, those skilled in the art will appreciate that the aforementioned application contents may be presented only in an exemplary manner and may not be restrictive. Although not explicitly stated herein, those skilled in the art will appreciate that this application is intended to encompass various reasonable changes, improvements and modifications to the embodiments. These changes, improvements and modifications are within the spirit and scope of the exemplary embodiments of this application.

[0092] It should also be understood that although the terms first, second, third, etc. can be used to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. Therefore, without departing from the teachings of the present application, the first element in some embodiments can be referred to as the second element in other embodiments. The same reference numerals or the same reference signs represent the same elements throughout the specification.

Claims

1. A control circuit of a laser therapy device, the laser therapy device comprising a laser, a microcontroller connected to the laser for communication, and a shutter motor for driving the laser shutter to open and close, characterized in that: The control circuit includes a switch module and a drive module, wherein: The on-off module is controlled to be turned on or off by a control signal to output an on-off signal; the control signal is output by a microcontroller based on the number of preheating laser pulses, the shutter opening time and the state of the laser; The driving module is used to configure the voltage of the shutter motor control signal according to the on or off state of the on / off module, and the shutter motor control signal is used to turn on or off the shutter motor.

2. The control circuit of the laser therapeutic apparatus according to claim 1, characterized in that: The on-off module includes a photocoupler, which is configured with an anode pin, a cathode pin, an emitter pin and a collector pin; the anode pin is connected to the first power supply terminal, the cathode pin inputs the control signal, the emitter pin outputs the on-off signal, and the collector pin is connected to the second power supply terminal.

3. The control circuit of the laser therapeutic apparatus according to claim 2, characterized in that: The on-off module further includes a first resistor and a second resistor; the anode pin is connected to the first power supply terminal through the first resistor; and the cathode pin inputs the control signal through the second resistor.

4. The control circuit of the laser therapeutic apparatus according to claim 1, characterized in that: The driving module includes a relay, and the relay includes a relay coil, a first contact and a second contact; the relay coil is controlled by the on-off signal, the first contact is connected to the second power supply terminal, and the second contact is configured as a control output terminal for outputting a shutter motor control signal.

5. The control circuit of the laser therapeutic apparatus according to claim 4, characterized in that: The driving module further includes a third resistor, a fourth resistor, a diode and a triode; wherein, One end of the third resistor inputs the on-off signal, and the other end is connected to the base of the transistor; the fourth resistor is connected between the base and the emitter of the transistor; the anode of the diode is connected to the collector of the transistor, and the cathode is connected to the second power supply end; the emitter of the transistor is connected to the first ground end; the anode and cathode of the diode are respectively connected to the two ends of the relay coil.

6. The control circuit of the laser therapeutic apparatus according to claim 1, characterized in that: If the shutter opening time point is earlier than the rising edge time of the light emitted from the first point of the laser scanning dot matrix, the shutter opening time is a negative value. If the shutter opening time point is later than the rising edge time of the light emitted from the first point of the laser scanning dot matrix, the shutter opening time is a positive value.

7. The control circuit of the laser therapeutic apparatus according to claim 1, characterized in that: The setting range of the preheating laser pulse number is less than or equal to 100; the setting range of the shutter opening time is -3276.8ms to 3276.7ms.

8. The control circuit of the laser therapeutic apparatus according to claim 1, characterized in that: The control circuit further comprises: a communication interface module connected to the laser, a communication protocol module for matching the microcontroller level and the communication protocol level, a dual-channel digital isolation module for isolating and protecting the laser input signal, and a power supply isolation module for voltage isolation; The communication interface module is configured with a receiving pin, a sending pin and a grounding pin, the receiving pin is connected to the communication interface receiving end, the sending pin is connected to the communication interface sending end, and the grounding pin of the communication interface module is connected to the first ground end; The communication protocol module is configured with a first receiving input pin, a first receiving output pin, a first sending input pin, a first sending output pin, a power pin and a ground pin, the first receiving input pin is connected to the communication interface receiving end, the first receiving output pin is connected to the communication protocol receiving end, the first sending input pin is connected to the communication protocol sending end, the first sending output pin is connected to the communication interface sending end, the power pin is connected to the first power end, the ground pin of the communication protocol module is connected to the first ground end, and a fifth capacitor is connected between the power pin and the ground pin of the communication protocol module; The dual-channel digital isolation module is configured with a first-end power pin, a first-end ground pin, a second-end power pin, a second-end ground pin, a first-end input pin, a first-end output pin, a second-end input pin, and a second-end output pin, wherein the first-end power pin is connected to the first power end, the first-end ground pin is connected to the first ground end, the second-end power pin is connected to the isolated third power end, the second-end ground pin is connected to the second ground end, the first-end input pin is connected to the communication protocol receiving end, the first-end output pin is connected to the microcontroller receiving end, the second-end input pin is connected to the microcontroller sending end, the second-end output pin is connected to the communication protocol sending end, the first-end power pin is connected to the first ground end through a sixth capacitor, and the second-end power pin is connected to the second ground end through a seventh capacitor; The power isolation module is configured with a voltage input pin, a voltage output pin, a ground pin and a 0V pin, the voltage input pin is connected to the third power supply terminal, the voltage output pin is connected to the isolated third power supply terminal, the ground pin is connected to the first ground terminal, the 0V pin is connected to the second ground terminal, the voltage input pin is connected to the first ground terminal through the eighth capacitor, and the voltage output pin is connected to the second ground terminal through the ninth capacitor and the tenth capacitor connected in parallel.

9. The control circuit of the laser therapeutic apparatus according to claim 8, characterized in that: The communication interface is an RJ45 interface, and the communication protocol is an RS232 protocol.

10. The control circuit of the laser therapeutic apparatus according to claim 8, characterized in that: The communication protocol module is also configured with a first capacitor positive pin, a first capacitor negative pin, a second capacitor positive pin, a second capacitor negative pin, a positive voltage pin and a negative voltage pin, the first capacitor positive pin and the first capacitor negative pin are respectively connected to the positive and negative electrodes of the first capacitor, the second capacitor positive pin and the second capacitor negative pin are respectively connected to the positive and negative electrodes of the second capacitor, the positive voltage pin is connected to the first ground terminal through a third capacitor, and the negative voltage pin is connected to the first ground terminal through a fourth capacitor.

11. A laser therapeutic apparatus, characterized in that: include: A microcontroller, a laser, a shutter motor, a dot matrix scanning handle and a control circuit as claimed in any one of claims 1 to 10, wherein the dot matrix scanning handle is provided with a laser incident port.

12. The laser therapeutic apparatus according to claim 11, characterized in that: The dot matrix scanning handle comprises a diffraction optical element, which is used for splitting the incident laser single pulse beam into a uniform array beam.

13. The laser therapeutic apparatus according to claim 11, characterized in that: Also includes: The human-computer interaction module is used to input the number of preheating laser pulses and the shutter opening time.

14. The laser therapeutic apparatus according to claim 13, characterized in that: The human-computer interaction module is an LCD touch screen.

15. A control method for a laser therapy device, the laser therapy device comprising a laser, a microcontroller connected to the laser for communication, and a shutter motor for driving the laser shutter to open and close, characterized in that: The control method comprises: Get the status of the laser; A control signal is output based on the number of preheating laser pulses, the shutter opening time and the state of the laser, and the control signal is used to control the shutter motor.

16. The control method of the laser therapeutic apparatus according to claim 15, characterized in that: Also includes: The voltage of the shutter motor control signal is configured based on the control signal, and the shutter motor control signal is used to turn on or off the shutter motor.

17. The control method of the laser therapeutic apparatus according to claim 15, characterized in that: The setting range of the preheating laser pulse number is less than or equal to 100; the setting range of the shutter opening time is -3276.8ms to 3276.7ms; if the shutter opening time point is earlier than the rising edge time of the first point of the laser scanning dot matrix, the shutter opening time is a negative value; if the shutter opening time point is later than the rising edge time of the first point of the laser scanning dot matrix, the shutter opening time is a positive value.

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