CN103239290A - Temperature measurement method of RF (Radio Frequency) anastomat - Google Patents

Abstract

The invention discloses a temperature measurement method of a RF (Radio Frequency) anastomat. The temperature measurement method comprises the following steps of: step 1, fixedly installing a temperature sensor on a metal round ring of a far-end structure of a bipolar RF intestinal canal anastomat; step 2, switching on a temperature detection circuit to acquire a temperature signal of the temperature sensor during a RF stop period within a RF energy change period; and step 3, switching off the temperature detection circuit to stop acquiring the temperature signal of the temperature sensor during the RF output period within the RF energy change period. The temperature measurement method of the RF anastomat has the following advantages of being capable of not only sending the temperature sensor to an operation part exactly, but also avoiding interference under a high-frequency high-current condition and measuring the temperature of the operation part exactly.

Description

A kind of temp measuring method of radio frequency anastomat

Technical field

The present invention relates to the thermometry that a kind of Electrosurgical instrument acts on tissue site, be specifically related to a kind of temp measuring method of radio frequency anastomat.

Background technology

Along with progress of science and technology, Electrosurgical instrument (power can reach more than the 300W) based on the big electric current of radio frequency, because of advantage such as its operating efficiency height, safety, postoperative effect be good, in closure, cut-out, welding and the tumor resection of various organism tracts, progressively be applied, its ultimate principle is the severe thermal effect of utilizing highdensity high frequency electric to produce at the pathological tissues place, and this violent heat effect will cause phenomenons such as organizing moisture vaporization, protein denaturation to reach effects such as closure, cut-out, welding.

Chinese patent application numbers 201310053048.4 has been put down in writing a kind of " bipolar radio frequency bowel anastomosis device and method of work ", as shown in Figure 1, bipolar radio frequency bowel anastomosis device comprises proximal structure 1, distal structure 2 and radio-frequency (RF) energy generator 3, proximal structure 1 is placed in the intestinal near-end, distal structure 2 is divided into head and handle portion, distal structure 2 all is positioned at the intestinal far-end, handle portion inside has lead to connect radio-frequency (RF) energy generator 3, after the proximal structure 1 of bowel anastomosis device and distal structure 2 butt joints, proximal structure 1 metal ring is connected to the positive pole of radio-frequency power supply by the locking pin of distal structure 2, and the metal ring of distal structure 2 connects the negative pole of radio-frequency power supply with lead; The intestinal tissue of implementing anastomosis operation is clamped between the metal ring of proximal structure 1 metal ring and distal structure 2, when radio-frequency (RF) energy generator 3 is opened, and the intestinal tissue energising heating of bipolar radio frequency bowel anastomosis device to coincideing.The operating current size of bipolar radio frequency bowel anastomosis device about 4A, the high frequency frequency is about 450KHZ.

The employed radio-frequency (RF) energy of this bipolar radio frequency bowel anastomosis device be the high frequency frequency sine wave that is 450KHZ and the low frequency frequency square wave that is 5HZ through with computing after the energy waves that obtains, as shown in Figure 2, the radio-frequency (RF) energy ripple is in one-period 200ms, the radio frequency of high frequency frequency 450KHZ output 100ms, radio frequency 100 ms that stop.Above-mentioned bipolar radio frequency bowel anastomosis device in use, sharply the temperature that raises can act on the tissue site temperature so must measure operating theater instruments in real time, exactly in the electrosurgery to the hot injury that causes of diseased region and normal surrounding tissue.Use existing temperature detection technology to have following shortcoming:

1. existing temperature detection apparatus can not detect the temperature of operative site easily in carrying out the identical operation of radio-frequency (RF) energy, especially in the single hole Minimally Invasive Surgery, is difficult to operative site is delivered in an independent temperature sensor exactly;

2. existing temp measuring method collecting temperature under the big current condition of high frequency can be subjected to very big interference, even can damage temperature sensing circuit, can not collect the actual temperature of operative site exactly.

Summary of the invention

Technical problem to be solved by this invention just provides a kind of temp measuring method of radio frequency anastomat, and it can deliver to operative site exactly with temperature sensor, can avoid interference under the big current condition of high frequency again, accurately measures the temperature of operative site.

Solve the problems of the technologies described above, the present invention includes following steps:

Step 1, temperature sensor is fixedly mounted on the distal structure metal ring of bipolar radio frequency bowel anastomosis device;

Step 2, the radio frequency paralysis period in the radio-frequency (RF) energy period of change are opened temperature sensing circuit, the temperature signal of collecting temperature sensor;

Between step 3, the radio frequency period of output in the radio-frequency (RF) energy period of change, cut off temperature sensing circuit, stop the temperature signal of collecting temperature sensor.

The said temperature sensor can be selected occasionally critesistor of the little thermoelectricity of volume for use.

Because the distal structure metal ring of bipolar radio frequency bowel anastomosis device is for connecting the negative pole of radio-frequency power supply, temperature sensor is implanted on the electrode of the big electric current of high frequency, nature has been sent to operative site with temperature sensor, can accurately measure the temperature at bowel anastomosis position; Again because the radio frequency paralysis period in each cycle that radio-frequency (RF) energy changes; carry out temperature signal collection; the measure signal interference of having avoided this moment high-frequency signal to produce; between the radio frequency period of output in each cycle that radio-frequency (RF) energy changes; stop temperature signal collection; protect temperature sensing circuit not to be subjected to the infringement of the big electric current of high frequency, increased the reliability of temperature sensing circuit.So the present invention has following advantage: temperature sensor can be delivered to operative site exactly, can under the big current condition of high frequency, avoid interference again, accurately measure the temperature of operative site.

Description of drawings

Description of drawings of the present invention is as follows:

Fig. 1 is the structural representation of the bipolar radio frequency bowel anastomosis device of background technology;

Fig. 2 is the output current wave figure of radio-frequency (RF) energy;

Fig. 3 is that the distal structure metal ring of bipolar radio frequency bowel anastomosis device is implanted temperature sensor;

Fig. 4 is the system for detecting temperature structural representation of this method invention;

Fig. 5 changes test pattern for the operation tissue temperature that uses this method invention.

Among the figure: 1. proximal structure; 2. distal structure; 22. metal ring; 3. radio-frequency (RF) energy generator; 5. temperature sensor; 6. sensor connecting line; 7. temperature detection and modulate circuit; 8. host computer.

The specific embodiment

The invention will be further described below in conjunction with drawings and Examples:

The present invention includes following steps:

Step 1, temperature sensor is fixedly mounted on the distal structure metal ring of bipolar radio frequency bowel anastomosis device;

Step 2, the radio frequency paralysis period in the radio-frequency (RF) energy period of change are opened temperature sensing circuit, the temperature signal of collecting temperature sensor;

Between step 3, the radio frequency period of output in the radio-frequency (RF) energy period of change, cut off temperature sensing circuit, stop the temperature signal of collecting temperature sensor.

As shown in Figure 3, temperature sensor 5 is fixedly mounted on distal structure 2 metal rings 22 of bipolar radio frequency bowel anastomosis device.

As shown in Figure 4, temperature sensor 5 is positioned at distal structure 2 apical heads, contact with operation tissue, temperature sensor 5 tissue temperature of will performing the operation changes into the signal of telecommunication, imports temperature detection and modulate circuit 7 into by sensor connecting line 6 herein, the temperature signal of temperature detection and 7 pairs of detections of modulate circuit is nursed one's health, filtering after the isolation, is transported in the host computer 8, host computer 8 shows and the record variation of temperature, and exports radio-frequency (RF) energy according to default temperature threshold values control radio-frequency (RF) energy generator 3; Radio-frequency (RF) energy generator 3 is controlled unlatching and the cut-out of temperature detection and modulate circuit 7 according to the variable condition of radio-frequency (RF) energy ripple simultaneously:

Radio frequency paralysis period in the radio-frequency (RF) energy period of change is opened temperature detection and modulate circuit 7, the temperature signal of collecting temperature sensor;

Between the radio frequency period of output in the radio-frequency (RF) energy period of change, cut off temperature detection and modulate circuit 7, stop the temperature signal of collecting temperature sensor.

Among Fig. 4, the temperature threshold values also can be arranged in the radio-frequency (RF) energy generator 3, and host computer 8 only shows and records variation of temperature like this, needn't control radio frequency power generator 3.

Among the embodiment as shown in Figure 5, the temperature of operation tissue is set threshold values, adopt this method invention and system for detecting temperature shown in Figure 4, can be with temperature control within the specific limits.Fig. 5 has shown that the temperature of operation tissue changes the hot injury who has avoided intestinal tissue to cause because of the temperature height like this in 70-80 ℃ of scope.This method invention can be delivered to operative site exactly with temperature sensor, can avoid interference under the big current condition of high frequency again, accurately measures the temperature of operative site.

Claims (2)

1. the temp measuring method of a radio frequency anastomat is characterized in that, may further comprise the steps:

Step 1, temperature sensor is fixedly mounted on the distal structure metal ring of bipolar radio frequency bowel anastomosis device;

Step 2, the radio frequency paralysis period in the radio-frequency (RF) energy period of change are opened temperature sensing circuit, the temperature signal of collecting temperature sensor;

Between step 3, the radio frequency period of output in the radio-frequency (RF) energy period of change, cut off temperature sensing circuit, stop the temperature signal of collecting temperature sensor.

2. the temp measuring method of a kind of radio frequency anastomat according to claim 1 is characterized in that: in described step 2 and the step 3, and unlatching and the cut-out of radio-frequency (RF) energy generator control temperature sensing circuit.

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