CN113855213A - Working medium conveying control method and low-temperature freezing treatment system - Google Patents
Working medium conveying control method and low-temperature freezing treatment system Download PDFInfo
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- 238000011282 treatment Methods 0.000 title claims abstract description 181
- 238000007710 freezing Methods 0.000 title claims abstract description 58
- 230000008014 freezing Effects 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000007788 liquid Substances 0.000 claims abstract description 32
- 239000012530 fluid Substances 0.000 claims description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 120
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 57
- 238000001816 cooling Methods 0.000 abstract description 21
- 230000009467 reduction Effects 0.000 abstract description 4
- 238000011298 ablation treatment Methods 0.000 abstract description 2
- 238000000315 cryotherapy Methods 0.000 description 7
- 229910001873 dinitrogen Inorganic materials 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000005482 strain hardening Methods 0.000 description 3
- 201000011510 cancer Diseases 0.000 description 2
- 206010028980 Neoplasm Diseases 0.000 description 1
- 238000002512 chemotherapy Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000003902 lesion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000001959 radiotherapy Methods 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
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- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/02—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by cooling, e.g. cryogenic techniques
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00005—Cooling or heating of the probe or tissue immediately surrounding the probe
- A61B2018/00011—Cooling or heating of the probe or tissue immediately surrounding the probe with fluids
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00005—Cooling or heating of the probe or tissue immediately surrounding the probe
- A61B2018/00011—Cooling or heating of the probe or tissue immediately surrounding the probe with fluids
- A61B2018/00017—Cooling or heating of the probe or tissue immediately surrounding the probe with fluids with gas
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- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00571—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
- A61B2018/00577—Ablation
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00636—Sensing and controlling the application of energy
- A61B2018/00696—Controlled or regulated parameters
- A61B2018/00714—Temperature
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00636—Sensing and controlling the application of energy
- A61B2018/00773—Sensed parameters
- A61B2018/00791—Temperature
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Abstract
The invention relates to a working medium conveying control method and a low-temperature freezing treatment system, relates to the technical field of ablation treatment, and is used for solving the technical problem that the cooling speed is high and liquid nitrogen can not be saved. According to the working medium conveying control method, the low-temperature freezing treatment system adjusts the state of the currently conveyed working medium according to the temperature of the treatment end and/or the duration of the temperature, so that the low-temperature freezing treatment system can control the output time and the output duration of the working medium in different states, the temperature reduction speed of the treatment end is high and the treatment end is stably kept at the lowest temperature during operation, and the purposes of reducing the temperature and saving the working medium can be achieved.
Description
Technical Field
The invention relates to the technical field of ablation treatment, in particular to a working medium conveying control method and a low-temperature freezing treatment system.
Background
Cancer has become the leading killer of current health threats to people. In addition to surgery, chemotherapy, and radiotherapy, cryoablation has become a new option for treating malignant tumors in recent years. The low-temperature freezing treatment equipment generally adopts liquid nitrogen working medium to carry out low-temperature freezing on the lesion tissues to achieve the purpose of treatment. However, if only a single working medium is used for cooling in a single state during operation, two purposes of high cooling speed and liquid nitrogen saving cannot be considered.
Disclosure of Invention
The invention provides a working medium conveying control method and a low-temperature freezing treatment system, which are used for solving the technical problem that the cooling speed is high and liquid nitrogen can not be saved.
According to a first aspect of the invention, the invention provides a working medium delivery control method, comprising the following operation steps:
s1: the low-temperature freezing treatment system conveys working media to a treatment end of the low-temperature freezing treatment system;
s2: acquiring the temperature of the treatment end and the duration of the temperature;
s3: according to the temperature of the treatment end and/or the duration of the temperature, the low-temperature freezing treatment system adjusts the state of the currently conveyed working medium;
wherein the working medium is a single working medium.
In one embodiment, step S3 includes the following sub-steps:
s31: according to the temperature of the treatment end and the duration time of the temperature, the low-temperature freezing treatment system adjusts the currently conveyed working medium from a first state to a second state and conveys the working medium in the second state;
s32: according to the temperature of the treatment end and the duration time of the temperature, the low-temperature freezing treatment system adjusts the currently conveyed working medium from the second state to the third state or the first state, and conveys the working medium in the third state or the first state;
s33: and according to the duration time of the temperature of the treatment end, the low-temperature freezing treatment system adjusts the currently conveyed working medium from the third state to the second state and conveys the working medium in the second state.
In one embodiment, step S31 includes the following sub-steps:
s311: judging whether the temperature of the treatment end meets a first temperature condition, if so, executing step S312;
s312: judging whether the duration time of the temperature of the treatment end meets a first time condition, if so, executing a step S313;
s313: the low-temperature freezing treatment system adjusts the currently conveyed working medium from a first state to a second state and conveys the working medium in the second state.
In one embodiment, step S32 includes the following sub-steps:
s321: judging whether the temperature of the treatment end meets a first temperature condition, if so, executing a step S322;
s322: judging whether the duration time of the temperature of the treatment end meets a first time condition, if so, executing a step S323;
s323: the low-temperature freezing treatment system adjusts the currently conveyed working medium from the second state to the third state and conveys the working medium in the third state.
In one embodiment, in step S321, if the temperature of the treatment end does not satisfy the first temperature condition, step S324 is executed;
s324: judging whether the temperature of the treatment end meets a second temperature condition, if so, executing a step S325;
s325: the low-temperature freezing treatment system adjusts the currently conveyed working medium from the second state to the first state and conveys the working medium in the first state.
In one embodiment, step S33 includes the following sub-steps:
s331: judging whether the temperature of the treatment end meets a second temperature condition, if so, executing step S332;
s332: the low-temperature freezing treatment system adjusts the currently conveyed working medium from the third state to the second state and conveys the working medium in the second state.
In one embodiment, the first temperature condition is a temperature of the treatment tip of less than-190 ℃ and the second temperature condition is a temperature of the treatment tip of greater than-180 ℃.
In one embodiment, the first time condition is that the temperature at the treatment end lasts 60s ± 5 s.
In one embodiment, the first state is a high pressure gas state; the second state is a liquid state; the third state is a low pressure gas state.
According to a first aspect of the invention, the invention provides a low-temperature freezing treatment system which adopts the working medium conveying control method to convey the working medium.
Compared with the prior art, the invention has the advantages that the low-temperature freezing treatment system adjusts the state of the currently conveyed working medium according to the temperature of the treatment end and/or the duration of the temperature, so that the low-temperature freezing treatment system can control the output time and the output duration of different states of a single working medium, the temperature reduction speed of the treatment end is high and the treatment end is stably kept at the lowest temperature during operation, and the purposes of considering the temperature reduction speed and saving the working medium can be achieved.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings.
FIG. 1 is a flow chart of a method of controlling delivery of a working fluid in an embodiment of the present invention;
FIG. 2 is a temperature-time dependent temperature reduction rate graph for different phases (states) of a cryogenic fluid in an embodiment of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
According to a first aspect of the invention, the invention provides a working medium delivery control method, which is suitable for a low-temperature cryotherapy system and comprises the following operation steps.
S1: the low-temperature freezing treatment system conveys the working medium to the treatment end of the low-temperature freezing treatment system.
The low-temperature freezing treatment system comprises a cold source (such as a cold tank containing cold working medium), a treatment instrument and a control system. The control system controls the cooling source to output the cold working medium in a certain state to the treatment end of the treatment instrument, and the cold working medium exchanges heat with the target area at the treatment end.
S2: the temperature of the treatment end and the duration of the temperature are acquired.
It should be noted that the "temperature of the treatment end" described herein may be a temperature interval, and thus the "time during which the temperature lasts" refers to the time during which the temperature of the treatment end is kept within the temperature interval. In other words, the temperature of the treatment tip may have a small fluctuation, which is not considered to be a change in the temperature of the treatment tip. Therefore, the time for which the temperature lasts is considered to be over only when the temperature of the treatment end exceeds the temperature interval.
S3: according to the temperature of the treatment end and/or the duration of the temperature, the low-temperature freezing treatment system adjusts the state of the currently delivered working medium.
Although the working medium is a single working medium, the invention can realize the purpose of changing the cooling speed by adjusting the state of the currently conveyed working medium to match the working medium in the corresponding state to output at different temperatures of the treatment end and/or the duration time of the temperature, and simultaneously can achieve the purpose of reducing the consumption rate of the working medium, because the density of nitrogen is about 200 times of that of liquid nitrogen at the temperature of 196 ℃ below zero, and 1L of liquid nitrogen can be evaporated into 200L of nitrogen. Therefore, when the low-temperature freezing treatment system operates, the working medium state is switched from liquid nitrogen to nitrogen, so that the consumption of the liquid nitrogen working medium can be saved. Therefore, the problem that the single state of a single working medium in the existing system cannot give consideration to both the cooling speed and the working medium saving is solved.
Specifically, step S3 includes the following sub-steps.
S31: according to the temperature of the treatment end and the duration time of the temperature, the low-temperature freezing treatment system adjusts the currently conveyed working medium from the first state to the second state and conveys the working medium in the second state.
S32: and according to the temperature of the treatment end and the duration time of the temperature, the low-temperature freezing treatment system adjusts the currently conveyed working medium from the second state to the third state or the first state, and conveys the working medium in the third state or the first state.
S33: and according to the duration time of the temperature of the treatment end, the low-temperature freezing treatment system adjusts the currently conveyed working medium from the third state to the second state and conveys the working medium in the second state.
Steps S31, S32, and S33 will be described below, respectively.
First, describing step S31 in detail, step S31 includes the following steps.
S311: and judging whether the temperature of the treatment end meets the first temperature condition, if so, executing the step S312. Wherein the first temperature condition may be that the temperature of the treatment tip is less than-190 ℃.
S312: and judging whether the duration time of the temperature of the treatment end meets the first time condition, if so, executing step 313. Wherein the first time condition may be that the temperature of the treatment tip lasts 60s ± 5 s. Preferably, the first time condition is that the temperature of the treatment tip lasts 60 s.
The duration of the temperature of the treatment tip is the duration of time during which the temperature of the treatment tip satisfies the first temperature condition. In other words, when the temperature of the treatment end is not less than-190 ℃, the time for which the temperature of the treatment end lasts is over. That is, the treatment tip maintains its temperature at less than-190 ℃ for at least 55 seconds (preferably 60 seconds) before performing step S313.
S313: the low-temperature freezing treatment system adjusts the currently conveyed working medium from a first state to a second state and conveys the working medium in the second state.
Preferably, the working fluid is high pressure nitrogen, low pressure nitrogen or liquid nitrogen. The high-pressure gas state, the liquid state and the low-pressure gas state are different phases under different pressure and temperature conditions.
Therefore, the first state, namely the working medium, is high-pressure nitrogen, the second state, namely the working medium, is liquid nitrogen, and the third state, namely the working medium, is low-pressure nitrogen.
As shown in fig. 2, curves A, B, C correspond to three different cooling rate curves when the working medium is liquid nitrogen, high-pressure nitrogen gas and low-pressure nitrogen gas, respectively. When the pressure of the high-pressure nitrogen exceeds about 30MPa, a curve B can be obtained, and the cooling rate of the curve B is higher than that of the curve when the working medium is liquid nitrogen; on the contrary, when the working medium is low-pressure nitrogen, a curve C or a curve with a lower cooling rate than the curve C can be obtained.
As can be seen from fig. 2, the cooling rate of the B curve is greater than that of the a curve, and the cooling rate of the C curve is less than that of the a curve. In the graph shown in fig. 2, the horizontal axis represents time (in s) and the vertical axis represents temperature (in K). Wherein, T1 shown by the vertical axis in FIG. 2 can be 77K, and T2 can be 300K. Therefore, according to the different cooling rate curves, the state of the working medium can be adjusted, thereby meeting different requirements.
Therefore, in step S31, the working fluid currently delivered by the cryotherapeutic system is the working fluid in the first state, such as high-pressure nitrogen. At the moment, when the first temperature condition and the first time condition are both met, the working medium (high-pressure nitrogen) in the current first state can meet the treatment requirement and has the surplus, so that the low-temperature freezing treatment system can correspondingly change the cooling speed and the working medium consumption rate by adjusting the state of the low-temperature freezing treatment system, for example, adjusting the state of the low-temperature freezing treatment system to liquid nitrogen.
It should be noted that "high pressure" means a gauge pressure higher than 1 standard atmospheric pressure, and "low pressure" means a gauge pressure lower than 1 standard atmospheric pressure.
Next, describing step S32 in detail, step S32 includes the following steps. And according to step S31, the working medium currently delivered by the cryotherapy system is in the second state.
S32: and according to the temperature of the treatment end and the duration time of the temperature, the low-temperature freezing treatment system adjusts the currently conveyed working medium from the second state to the third state or the first state, and conveys the working medium in the third state or the first state.
In some specific embodiments, step S32 may be implemented as follows.
S321: judging whether the temperature of the treatment end meets a first temperature condition, if so, executing a step S322; if not, go to step S324. Wherein the first temperature condition may be that the temperature of the treatment tip is less than-190 ℃.
S322: and judging whether the duration time of the temperature of the treatment end meets the first time condition, if so, executing the step S323. The first time condition may be that the temperature of the treatment tip lasts 60s ± 5 s. Preferably, the first time condition is that the temperature of the treatment tip lasts 60 s.
Similarly, therefore, in step S322, the treatment end also needs to keep its temperature less than-190 ℃ for at least 55S (preferably 60S) before step S323 can be executed.
S323: the low-temperature freezing treatment system adjusts the currently conveyed working medium from the second state to the third state and conveys the working medium in the third state.
S324: judging whether the temperature of the treatment end meets a second temperature condition, if so, executing a step S325; if not, go to step S326. Wherein the second temperature condition may be that the temperature of the treatment tip is greater than-180 ℃.
S325: the low-temperature freezing treatment system adjusts the currently conveyed working medium from the second state to the first state and conveys the working medium in the first state.
S326: the low-temperature freezing treatment system maintains the currently conveyed working medium in a second state and conveys the working medium in the second state.
Therefore, in step S32, the working fluid currently delivered by the cryotherapeutic system is the working fluid in the second state, such as liquid nitrogen. At the moment, when the first temperature condition and the first time condition are both met, the working medium (liquid nitrogen) in the current second state can meet the treatment requirement, and the working medium (liquid nitrogen) in the current second state has the surplus, so that the low-temperature freezing treatment system can correspondingly change the cooling speed and the working medium consumption rate by adjusting the state of the low-temperature freezing treatment system, for example, adjusting the state of the low-temperature freezing treatment system to be low-pressure nitrogen.
On the contrary, in step S32, when the first temperature condition cannot be satisfied and the second temperature condition can be satisfied, it indicates that the temperature is unstable, that is, the current working medium cannot satisfy the treatment requirement, so that the low-temperature cryotherapy system can increase the cooling rate by adjusting the state thereof, for example, adjusting the state thereof to high-pressure nitrogen.
In addition, if the temperature of the treatment end meets the first temperature condition but does not meet the second temperature condition, for example, the temperature of the treatment end is in a temperature range of [ -190 ℃, -180 ℃ ], then it indicates that the temperature of the treatment end generates a small amplitude fluctuation, and the fluctuation can be considered as a normal level, so that the cryotherapeutic system can maintain the currently delivered working medium in the second state and deliver the working medium in the second state, for example, liquid nitrogen.
Third, step S33 will be described in detail. Step S33 includes the following steps. And according to step S32, the working medium currently delivered by the cryotherapy system is in the third state.
S331: judging whether the temperature of the treatment end meets a second temperature condition, if so, executing step S332; if not, the low-temperature freezing treatment system maintains the currently conveyed working medium in the third state and conveys the working medium in the third state. Wherein the second temperature condition may be that the temperature of the treatment tip is greater than-180 ℃.
S332: the low-temperature freezing treatment system adjusts the currently conveyed working medium from the third state to the second state and conveys the working medium in the second state.
Therefore, in step S33, the working fluid currently delivered by the cryotherapeutic system is the working fluid in the third state, such as low-pressure nitrogen. At this time, when the first temperature condition cannot be met and the second temperature condition can be met, the situation that the temperature is unstable is shown, namely the current working medium cannot meet the treatment requirement, so that the low-temperature freezing treatment system can increase the cooling speed by adjusting the state of the low-temperature freezing treatment system, for example, adjusting the low-temperature freezing treatment system to liquid nitrogen.
In addition, if the temperature of the treatment end does not meet the second temperature condition, the working medium in the current third state can be considered to meet the treatment requirement, so the low-temperature freezing treatment system can maintain the currently conveyed working medium in the third state and convey the working medium in the third state, such as low-pressure nitrogen.
The method of the present invention will be described in detail below, taking as an example the switching of the working fluid to be delivered between high-pressure nitrogen gas, liquid nitrogen and low-pressure nitrogen gas, as shown in FIG. 1.
In step 1, the cryotherapeutic system begins to operate.
And step 2, delivering high-pressure nitrogen to the treatment end.
It should be noted that, because the initial temperature of the cryotherapy system is high when the cryotherapy system starts to operate, high-pressure nitrogen gas needs to be used as the current working medium for conveying, so as to achieve the purpose of rapid cooling. However, cryotherapeutic systems may alternatively be delivered with liquid nitrogen or low pressure nitrogen, and thus the dashed lines are shown in FIG. 1 between step 1 and step 9, and between step 1 and step 17.
In step 3, the temperature A1 of the treatment end is obtained, and the timing T1 is started. Wherein the temperature a1 can be obtained by a temperature measuring element at the treatment end of the treatment device.
And 4, judging whether the temperature A1 of the treatment end is less than-190 ℃.
And if the judgment result in the step 4 is that the temperature A1 of the treatment end is less than-190 ℃, continuously judging whether the time T1 is more than 60s (step 5). If time T1 is greater than 60s, then T1 is reset to zero (step 6) and the cryotherapeutic system can adjust the currently delivered high pressure nitrogen to liquid nitrogen (step 7).
On the contrary, if the result of the judgment in the step 4 is that the temperature A1 of the treatment end is not less than-190 ℃, the T1 is reset to zero (step 8), and the step 3 is returned, namely, the temperature is acquired again and the timing is started.
In addition, in the step 6, if the time T1 is not greater than 60s, it indicates that the temperature A1 of the treatment end does not last for the required time, so it needs to return to the step 4 to continuously determine whether the temperature A1 of the treatment end is less than-190 ℃.
And 9, delivering liquid nitrogen to the treatment end.
And step 10, according to the step 4, the working medium currently conveyed to the treatment end is liquid nitrogen. Therefore, the temperature A2 of the treatment end is continuously obtained, and the timing T2 is started. Wherein the temperature a2 can be obtained by a temperature measuring element at the treatment end of the treatment device.
And 11, judging whether the temperature A2 of the treatment end is less than-190 ℃.
If the result of the judgment in the step 11 is that the temperature A2 of the treatment end is less than-190 ℃, continuing to judge whether the time T2 is more than 60s (step 12). If time T2 is greater than 60s, T2 is reset to zero (step 13) and the cryotherapeutic system can adjust the currently delivered liquid nitrogen to low pressure nitrogen and deliver the low pressure nitrogen to the treatment end (step 14).
On the contrary, if the result of the judgment in the step 11 is that the temperature A2 of the treatment end is not less than-190 ℃, the judgment is continued to be made whether the temperature A2 of the treatment end is greater than-180 ℃ (the step 15). If the temperature A2 of the treatment end is more than-180 ℃, the temperature indicates that the current temperature can not meet the treatment requirement, so that the cryotherapy system is required to adjust the currently delivered liquid nitrogen into high-pressure nitrogen and deliver the high-pressure nitrogen to the treatment end (i.e. the step 2 is shifted).
In addition, if the result of the judgment in the step 15 is that the temperature A2 of the treatment end is not more than-180 ℃, it indicates that the temperature A2 of the treatment end has a small fluctuation, which is considered as a normal level, and therefore, T2 is reset to zero (step 16), and the process returns to the step 10, and the temperature acquisition and the timing are restarted.
In addition, in the step 12, if the time T2 is not greater than 60s, it indicates that the temperature a2 of the treatment end does not last for the required time, so it needs to return to the step 11 to continuously determine whether the temperature a2 of the treatment end is less than-190 ℃.
And step 17, delivering low-pressure nitrogen to the treatment end.
And step 18, according to the step 14, the working medium currently conveyed to the treatment end is low-pressure nitrogen. Thus, the temperature a3 of the treatment end is continuously obtained. Wherein the temperature a3 can be obtained by a temperature measuring element at the treatment end of the treatment device.
And step 19, judging whether the temperature A3 of the treatment end is more than-180 ℃.
If the judgment result in the step 19 is that the temperature A3 of the treatment end is greater than-180 ℃, the current temperature cannot meet the treatment requirement, so that the low-pressure nitrogen gas currently delivered by the low-temperature freezing treatment system is required to be adjusted to be liquid nitrogen, and the liquid nitrogen is delivered to the treatment end (namely, the step 9 is switched).
If the result of the judgment in the step 19 is that the temperature A3 of the treatment end is not more than-180 ℃, the result shows that the temperature A2 of the treatment end has small fluctuation, and the fluctuation is considered as a normal level, so the step 18 is returned to start acquiring the temperature again.
When low-pressure nitrogen is used as a working medium for conveying, the cooling speed and the consumption rate of the nitrogen are both the lowest level, so that the continuous time of temperature does not need to be acquired.
Therefore, the working medium conveying control method of the invention switches the high-pressure nitrogen → the liquid nitrogen → the low-pressure nitrogen step by step according to the temperature of the treatment end and the duration time of the temperature, thereby achieving the effects of adjusting the cooling speed or saving the liquid nitrogen on the premise of ensuring that the temperature of the treatment end does not fluctuate greatly due to the change of the working medium. And if the currently conveyed working medium cannot meet the requirements, the working medium with a higher cooling speed is switched to be conveyed, so that the adaptability of the control mode among mass production equipment can be further improved.
According to a second aspect of the invention, the invention provides a cryotherapeutic system for delivering a working fluid using the working fluid delivery control method described above.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A working medium conveying control method is characterized by comprising the following operation steps:
s1: the low-temperature freezing treatment system conveys the working medium to a treatment end of the low-temperature freezing treatment system;
s2: acquiring the temperature of the treatment end and the duration of the temperature;
s3: according to the temperature of the treatment end and/or the duration of the temperature, the low-temperature freezing treatment system adjusts the state of the currently conveyed working medium;
wherein the working medium is a single working medium.
2. Working medium delivery control method according to claim 1, characterized in that step S3 comprises the following sub-steps:
s31: according to the temperature of the treatment end and the duration time of the temperature, the low-temperature freezing treatment system adjusts the currently conveyed working medium from a first state to a second state and conveys the working medium in the second state;
s32: according to the temperature of the treatment end and the duration time of the temperature, the low-temperature freezing treatment system adjusts the currently conveyed working medium from the second state to the third state or the first state, and conveys the working medium in the third state or the first state;
s33: and according to the duration time of the temperature of the treatment end, the low-temperature freezing treatment system adjusts the currently conveyed working medium from the third state to the second state and conveys the working medium in the second state.
3. Working medium delivery control method according to claim 2, characterized in that step S31 comprises the following sub-steps:
s311: judging whether the temperature of the treatment end meets a first temperature condition, if so, executing step S312;
s312: judging whether the duration time of the temperature of the treatment end meets a first time condition, if so, executing a step S313;
s313: the low-temperature freezing treatment system adjusts the currently conveyed working medium from a first state to a second state and conveys the working medium in the second state.
4. Working medium delivery control method according to claim 2, characterized in that step S32 comprises the following sub-steps:
s321: judging whether the temperature of the treatment end meets a first temperature condition, if so, executing a step S322;
s322: judging whether the duration time of the temperature of the treatment end meets a first time condition, if so, executing a step S323;
s323: the low-temperature freezing treatment system adjusts the currently conveyed working medium from the second state to the third state and conveys the working medium in the third state.
5. Working medium conveying control method according to claim 4, characterized in that in step S321, if the temperature of the treatment end does not satisfy the first temperature condition, step S324 is executed;
s324: judging whether the temperature of the treatment end meets a second temperature condition, if so, executing a step S325;
s325: the low-temperature freezing treatment system adjusts the currently conveyed working medium from the second state to the first state and conveys the working medium in the first state.
6. Working medium delivery control method according to claim 2, characterized in that step S33 comprises the following sub-steps:
s331: judging whether the temperature of the treatment end meets a second temperature condition, if so, executing step S332;
s332: the low-temperature freezing treatment system adjusts the currently conveyed working medium from the third state to the second state and conveys the working medium in the second state.
7. Working medium conveying control method according to any one of claims 4-6, characterized in that the first temperature condition is that the temperature of the treatment end is less than-190 ℃ and the second temperature condition is that the temperature of the treatment end is greater than-180 ℃.
8. Working medium delivery control method according to any of claims 4-6, characterized in that the first time condition is that the temperature of the treatment end lasts 60s ± 5 s.
9. Working medium conveying control method according to any one of claims 2-6, characterized in that the first state is a high-pressure gas state; the second state is a liquid state; the third state is a low pressure gas state.
10. A cryotherapeutic system for delivering a working fluid using the working fluid delivery control method of any one of claims 1 to 9.
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