CN-122005112-A - Electronic control method of medical laser positioning system

CN122005112ACN 122005112 ACN122005112 ACN 122005112ACN-122005112-A

Abstract

The invention discloses an electronic control method of a medical laser positioning system, which comprises the following steps of acquiring a light signal which is reflected by positioning laser on the body surface of a patient and modulated by respiratory motion and converting the light signal into a corresponding sensing electric signal, processing the sensing electric signal to identify whether the current respiratory cycle is in a preset stable phase, controlling the output mode of the positioning laser according to the identification result of S2, and controlling the positioning laser to work in a first output mode when the positioning laser is identified to be in the preset stable phase. By extracting the breathing phase in real time and thus precisely controlling the laser output pattern, the system is able to automatically provide clear positioning marks at the most stable moment in the breathing cycle.

Inventors

GU LONG
SU JIANJUN
Su Xingkang
WANG GUAN
ZHANG ZUOLIANG
CHENG HUANHUAN
ZHANG HAOJIA

Assignees

福建睿斯科医疗技术有限公司

Dates

Publication Date: 20260512
Application Date: 20260407

Claims (9)

1. An electronic control method of a medical laser positioning system is characterized by comprising the following steps: S1, a signal acquisition and conversion step, namely acquiring an optical signal which is reflected by positioning laser on the body surface of a patient and modulated by respiratory motion, and converting the optical signal into a corresponding sensing electric signal; S2, a phase identification step, namely processing the sensing electric signals to identify whether the current respiratory cycle is in a preset stable phase; s3, a laser gating step, namely controlling the output mode of the positioning laser according to the identification result of S2; when the positioning laser is identified to be in the preset stable phase, controlling the positioning laser to work in a first output mode; when the positioning laser is identified to be in the non-preset stable phase, controlling the positioning laser to work in a second output mode different from the first output mode; the first output mode is to make the positioning laser output a high-brightness beam, and the second output mode is to make the positioning laser output a prompting beam lower than the high brightness to flash at a preset frequency or turn off the prompting beam.
2. The method for electronically controlling a medical laser positioning system according to claim 1, wherein the step S1 specifically comprises performing analog conditioning on the sensing electric signal to obtain an analog conditioning signal, and performing analog-to-digital conversion on the analog conditioning signal to obtain a respiration sensing digital signal, and the step S2 comprises performing digital filtering processing on the respiration sensing digital signal.
3. The method according to claim 1, wherein in the step S2, the predetermined stationary phase is identified by performing time-domain waveform analysis or spectral analysis on the digitally filtered signal, and the predetermined stationary phase is an end-expiratory phase.
4. The method of electronic control of a medical laser positioning system according to claim 1, wherein said step S2 further comprises extracting respiratory motion amplitude information from said sensed electrical signals; the method further comprises the steps of: S4, an abnormality monitoring step, namely judging whether the breathing state is abnormal or not based on the amplitude information and/or the stability of the breathing rhythm, and triggering a local visual alarm and/or sending alarm information to an upper computer when judging that the breathing state is abnormal.
5. The method of electronic control of a medical laser positioning system according to claim 1, further comprising, prior to said step S1: And S0, a mode switching step, namely responding to an externally input mode switching instruction, and switching the working state of the medical laser positioning system into a respiratory gating mode for executing the steps S1 to S3.
6. The method of claim 5, wherein in the respiratory gating mode, the method synchronously performs a motor stall protection step of monitoring a current of a motor driving the positioning laser to move, and if the current exceeds a preset stall threshold, cutting off a driving power supply of the corresponding motor.
7. The method of electronic control of a medical laser positioning system according to claim 1, further comprising a device instruction screening step of screening and responding to an external control instruction corresponding to a unique hardware address set for a device.
8. The method of claim 1, wherein the method controls the positioning laser by a constant current driving circuit, and if the system is in a respiratory gating mode, the constant current driving circuit ensures stable brightness switching between the first output mode and the second output mode.
9. An electronic control method of a medical laser positioning system according to claim 3, wherein in the step S2, the identification of the preset stable phase also needs to satisfy a duration threshold condition, that is, when the identified stable phase duration reaches a preset threshold, the laser output mode switching in the step S3 is triggered, and the duration threshold ranges from 100ms to 500ms.

Description

Electronic control method of medical laser positioning system Technical Field The invention belongs to the technical field of medical laser positioning, and particularly relates to an electronic control method of a medical laser positioning system. Background In the fields of radiotherapy and surgical navigation, a medical laser positioning system is a key auxiliary device. The method provides accurate visual space reference for medical staff by projecting visible cross lines or punctiform laser beams to the body surface of a patient, thereby assisting in completing the posture positioning before treatment or path planning in operation. In the prior art, a control unit with a microprocessor as a core is generally adopted, and a stepping motor or a direct current motor is driven to adjust the space posture of a laser projection module by receiving an instruction from an infrared remote controller or a control panel so as to control the position of a light spot. The laser driving part is generally powered by a switching power supply or a linear voltage stabilizing circuit, and drives the laser diode to emit light through a basic current limiting resistor or a simple constant current circuit. In order to realize simultaneous use of multiple devices, the existing system mostly adopts software setting or dial switch to allocate logical addresses. In addition, basic fuses or voltage regulation devices are typically included in the circuit design to cope with common electrical fluctuations. However, with the development of accurate medical treatment, especially chest and abdomen tumor radiotherapy, the requirements on positioning precision are increasingly stringent, and the limitations of the prior art are increasingly remarkable. The fundamental disadvantage is that the system is single in function and the laser output is completely disjointed from the physiological state of the patient. The existing method can not sense physiological movements such as respiration, and the laser marking is always in static state or simple dynamic state of manual control, so that continuous errors are generated between a visual reference system and the actual position of a target area in a body when a patient breathes, subjective compensation is seriously dependent on experience of an operator, and sub-millimeter repeated positioning accuracy is difficult to realize. Meanwhile, each functional module of the system is relatively independent, and depth collaborative design and systematic protection facing to a clinical complex environment are lacked. For example, the stability of the laser driving power supply is insufficient, the consistency of light spots can be affected, the software address coding is easy to be confused under the condition of strong electromagnetic interference, and the motor movement lacks intelligent protection linked with the whole state of the system, so that hidden dangers exist in the aspects of reliability, anti-interference capability and long-term safety of the traditional equipment, and the comprehensive requirements of high precision, high reliability and high intellectualization of the positioning system by modern accurate radiotherapy and surgical operation cannot be fully met. Disclosure of Invention In order to overcome the defects in the prior art, the invention provides an electronic control method of a medical laser positioning system, which solves the problems that the medical laser positioning system in the prior art cannot actively compensate respiratory motion errors, has insufficient reliability and affects positioning accuracy. In order to achieve the above object, the present invention provides the following technical methods: an electronic control method of a medical laser positioning system comprises the following steps: S1, a signal acquisition and conversion step, namely acquiring an optical signal which is reflected by positioning laser on the body surface of a patient and modulated by respiratory motion, and converting the optical signal into a corresponding sensing electric signal; S2, a phase identification step, namely processing the sensing electric signals to identify whether the current respiratory cycle is in a preset stable phase; s3, a laser gating step, namely controlling the output mode of the positioning laser according to the identification result of S2; when the positioning laser is identified to be in the preset stable phase, controlling the positioning laser to work in a first output mode; and when the positioning laser is identified to be in the non-preset stable phase, controlling the positioning laser to work in a second output mode which is different from the first output mode. Preferably, the step S1 specifically comprises the steps of performing analog conditioning on the sensing electric signal to obtain an analog conditioning signal, and performing analog-to-digital conversion on the analog conditioning signal to obtain a respiration sensing digital signal,