CN-122005068-A - Intelligent contact screening system for high-frequency surgical instrument and tissue

CN122005068ACN 122005068 ACN122005068 ACN 122005068ACN-122005068-A

Abstract

The invention belongs to the technical field of high-frequency electrosurgical equipment and control, and particularly discloses an intelligent contact screening system for high-frequency surgical instruments and tissues. The signal is divided into digital and analog two paths, wherein the digital signal is used for calculating dielectric absorption quantization parameters, and is compared with a threshold value to classify effective tissue contact or conductive liquid contact state, and the analog signal is used for directly generating an analog control voltage. When the main output instruction is received, the analog control voltage directly modulates the high-frequency energy output stage in a continuous and proportional mode without any digital processing, so that the instantaneous self-adaptive closed-loop energy control based on the real-time contact quality is realized, and the safety and the effectiveness of the operation are improved.

Inventors

XU CHENKE
XU JINYANG
XU JING
ZHOU CHANG

Assignees

湖南峰恒晶医疗科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260413

Claims (10)

1. A high frequency surgical instrument and tissue intelligent contact screening system is characterized in that the system comprises: A diagnostic pulse generation module for generating and applying an asymmetric biphasic diagnostic pulse sequence to the surgical instrument tip to establish a polarized electric field at the contact interface for dielectric property detection; The signal acquisition module is used for receiving an electric signal from the tip of the surgical instrument, acquiring a transient residual voltage signal formed by contact interface charge attenuation in a measurement dead zone phase of a diagnosis pulse sequence, and dividing the signal into two paths of output, wherein one path is a digitized transient residual voltage signal, and the other path is an analog transient residual voltage signal which is not digitized; the parameter calculation module is used for receiving the transient residual voltage signal and calculating and quantifying dielectric absorption quantification parameters representing the dielectric absorption capacity of the target material based on the transient residual voltage signal; the analog control voltage generation module is used for receiving the analog transient residual voltage signal and generating an analog control voltage according to the amplitude of the signal at a preset time point; The contact state classification module is used for receiving the dielectric absorption quantization parameter, classifying and judging the contact state according to the comparison result of the parameter and a preset threshold value so as to generate a contact state classification result for man-machine interaction display, wherein the contact state comprises effective tissue contact and non-tissue conductive medium contact; the control logic module is used for generating an energy output enabling signal when receiving a main output instruction of an operator and simultaneously confirming that the contact state classification result is effective tissue contact; And the energy output modulation module is used for modulating the analog quantity of the high-frequency operation energy output stage by utilizing the analog control voltage when receiving the energy output enabling signal.
2. The high frequency surgical instrument-to-tissue intelligent contact screening system of claim 1, wherein generating and applying an asymmetric biphasic diagnostic pulse sequence to the surgical instrument tip to establish a polarized electric field at the contact interface for dielectric property detection comprises: Starting a pulse generating unit, and outputting an asymmetric biphasic diagnosis pulse sequence to an electrode of the high-frequency surgical instrument, wherein each period of the sequence consists of a forward charging phase and a subsequent measuring dead zone phase; Controlling the voltage amplitude of the forward charging phase to be lower than a preset biological tissue cell membrane depolarization threshold; by applying an asymmetric biphasic diagnostic pulse sequence to the surgical instrument tip, a transient polarizing electric field is established between the instrument tip and the contacted target material.
3. The high frequency surgical instrument and tissue intelligent contact screening system of claim 2, wherein acquiring transient residual voltage signals resulting from contact interface charge decay comprises: activating a signal buffer circuit connected with the surgical instrument electrode in parallel in the dead zone phase after the forward charging phase is finished; the signal buffer circuit is utilized to capture a voltage decay curve caused by the natural release of interface stored charges in real time, and the voltage decay curve is input to a signal distribution node; The first path of output of the signal distribution node is connected to an analog-to-digital converter to generate a digital transient residual voltage signal containing time domain information of the complete attenuation process; the second output of the signal distribution node is transmitted directly as an analog transient residual voltage signal that is not digitized.
4. The high frequency surgical instrument and tissue intelligent contact screening system of claim 1, wherein calculating and quantifying a dielectric absorption quantification parameter characterizing a dielectric absorption capacity of a target material comprises: Analyzing the transient residual voltage signal, and respectively extracting an initial voltage value at the initial moment of measuring the dead zone phase and a terminal voltage value at the terminal moment of a preset time window; the initial voltage holding ratio is obtained by calculating the ratio of the terminal voltage value to the initial voltage value.
5. The high frequency surgical instrument and tissue intelligent contact screening system of claim 4, wherein calculating and quantifying a dielectric absorption quantification parameter characterizing a dielectric absorption capacity of a target material further comprises: Acquiring preset normalized calibration parameters; and carrying out normalization processing on the initial voltage retention rate by using the normalization calibration parameters to generate normalized dielectric absorption quantification parameters.
6. The high frequency surgical instrument and tissue intelligent contact screening system of claim 1, wherein generating the analog control voltage comprises: inputting the analog transient residual voltage signal to a sampling hold circuit triggered synchronously by an asymmetric biphase diagnosis pulse sequence; The sample hold circuit samples the amplitude of the analog transient residual voltage signal at a preset sampling delay time point in the dead zone phase of measurement, outputs a hold direct current voltage proportional to the sampled amplitude, and takes the hold direct current voltage as an analog control voltage.
7. The intelligent contact screening system for high frequency surgical instruments and tissue according to claim 1, wherein the steps of receiving a dielectric absorption quantization parameter, classifying and discriminating the contact state according to the comparison result of the dielectric absorption quantization parameter and a preset threshold value, and generating a contact state classification result for man-machine interaction display comprise: comparing the dielectric absorption quantification parameter with a preset material property threshold comprising a first high level threshold for defining biological tissue and a second low level threshold for defining a conductive liquid; if the dielectric absorption quantization parameter is larger than the first high threshold, judging that the current contact state is effective tissue contact; And if the dielectric absorption quantification parameter is lower than the second low-order threshold value, judging that the non-tissue conductive medium is in contact.
8. The intelligent contact screening system of high frequency surgical instrument and tissue according to claim 7, wherein the method further comprises receiving a dielectric absorption quantization parameter, classifying and discriminating the contact state according to a comparison result of the dielectric absorption quantization parameter and a preset threshold value, so as to generate a contact state classification result for man-machine interaction display, and further comprising: Generating a corresponding digital code based on the determined state of effective tissue contact or non-tissue conductive medium contact; And outputting a contact state classification result which identifies the specific contact state, and enabling the human-computer interaction unit to perform state display or log recording.
9. The intelligent contact screening system for high frequency surgical instruments and tissue of claim 1, wherein analog modulation of the high frequency surgical energy output stage comprises: Directly coupling the analog control voltage to a gain control end of the high-frequency operation energy output power stage as a driving bias voltage of an internal power amplifying element of the high-frequency operation energy output power stage; the amplitude of the analog control voltage is positively correlated with the conduction degree of the power amplifying element, and is positively correlated with the therapeutic energy finally output.
10. The intelligent contact screening system for high frequency surgical instruments and tissue of claim 9, wherein the analog modulation of the high frequency surgical energy output stage further comprises: Using an inherent turn-on threshold voltage of the power amplifying element, allowing the energy channel to be turned on only when the magnitude of the analog control voltage exceeds the turn-on threshold voltage; upon receipt of the energy output enable signal, the magnitude of the therapeutic energy output to the surgical instrument is continuously and proportionally modulated by applying a real-time magnitude of the analog control voltage to the power amplifying element.

Description

Intelligent contact screening system for high-frequency surgical instrument and tissue Technical Field The invention belongs to the technical field of high-frequency electrosurgical equipment and control, and relates to an intelligent contact screening system for high-frequency surgical instruments and tissues. Background In modern surgery, high frequency surgical devices effect cutting and coagulation of biological tissue by applying high frequency electrical current to a surgical instrument. In order to ensure the safety and effectiveness of the surgical procedure, one of the key technical challenges is optimizing the timing and dosage of the energy application, the key premise being that the system is able to accurately perceive the contact state between the surgical instrument tip and the target tissue. If the energy output is started when the instrument is suspended or is in false contact with a non-target conductive medium, accidental injury of an arc to surrounding tissues or poor operation effect caused by dissipation of energy in conductive liquid can be caused, and requirements are set for intelligent identification capability of the system. To address this challenge, one solution commonly adopted in the industry is a method based on real-time impedance monitoring. The method is implemented by applying a low amplitude probe signal across the electrodes of the surgical instrument and continuously measuring the circuit impedance value therebetween. One or more impedance ranges representing normal tissue contact are preset in the system, and when the impedance value measured in real time falls within the preset range, the system determines that the impedance ranges are in effective contact, so that the output of high-frequency energy is allowed. The method utilizes the relatively stable impedance characteristic of biological tissues under specific frequency as a judgment basis, and can distinguish the suspended and contacted state of the instrument to a certain extent. However, there are inherent limitations to relying on only a single static impedance value as a criterion. For example, during surgery, the impedance of a conductive fluid such as blood, saline for irrigation, etc. present in the surgical field may be similar to or overlap with the impedance of certain biological tissues under certain conditions, which may cause ambiguity in recognition, and the system may misjudge the conductive fluid as a valid tissue, resulting in ineffective or even dangerous output of energy. In addition, simple impedance measurement is difficult to comprehensively reflect complex electrophysiological characteristics of tissues, and particularly cannot characterize capacitive effects caused by cell membrane structures, so that the information dimension is limited in the aspect of evaluating the quality of contact between an instrument and the tissues, and the method is required to be improved in complex surgical scenes requiring real-time energy regulation. Based on the above problems, the present invention aims to solve the problem of identification ambiguity possibly caused by simply relying on impedance measurement when distinguishing biological tissue from non-tissue conductive media in the prior art. Disclosure of Invention In order to overcome the defects in the prior art, the invention provides a technical scheme that a high-frequency surgical instrument and tissue intelligent contact screening system comprises a diagnosis pulse generation module, a detection module and a control module, wherein the diagnosis pulse generation module is used for generating and applying an asymmetric biphasic diagnosis pulse sequence to the tip of the surgical instrument so as to establish a polarized electric field for dielectric property detection at a contact interface. The signal acquisition module is used for receiving the electric signal from the tip of the surgical instrument, acquiring a transient residual voltage signal formed by the attenuation of the electric charge of the contact interface in the dead zone phase of the measurement of the diagnosis pulse sequence, and dividing the signal into two paths of output, wherein one path is a digitized transient residual voltage signal, and the other path is an analog transient residual voltage signal which is not digitized. And the parameter calculation module is used for receiving the transient residual voltage signal and calculating and quantifying a dielectric absorption quantification parameter representing the dielectric absorption capacity of the target material based on the transient residual voltage signal. The analog control voltage generation module is used for receiving the analog transient residual voltage signal and generating an analog control voltage according to the amplitude of the signal at a preset time point. The contact state classification module is used for receiving the dielectric absorption quantization parameter, classifying and judging the conta