阅读说明：本技术 高低温复合式治疗系统及其压力控制方法 (High-low temperature combined type treatment system and pressure control method thereof ) 是由 解明 黄乾富 于 2021-10-13 设计创作，主要内容包括：本发明涉及一种高低温复合式治疗系统及其压力控制方法,涉及消融治疗技术领域,用于调节低温工质的工作压力,使低温工质的消耗相对减少,从而延长运行时间。本发明的高低温复合式治疗系统的压力控制方法,通过第一温度条件和第二温度条件来判断高低温复合式治疗系统运行输出的低温工质的温度是否已经稳定在某一范围之内,则可采取分段降低系统输出的低温工质的压力的措施,从而达到既减少低温工质的消耗、延长运行时间的目的,同时也能达到减轻治疗器材中回流的低温工质对回热器的负担、提高系统运行安全的目的。(The invention relates to a high-low temperature combined type treatment system and a pressure control method thereof, relates to the technical field of ablation treatment, and is used for adjusting the working pressure of a low-temperature working medium so as to relatively reduce the consumption of the low-temperature working medium and prolong the operation time. The pressure control method of the high-low temperature combined type treatment system judges whether the temperature of the low-temperature working medium output by the high-low temperature combined type treatment system is stabilized within a certain range or not through the first temperature condition and the second temperature condition, and measures for reducing the pressure of the low-temperature working medium output by the system in a segmented mode can be taken, so that the purposes of reducing the consumption of the low-temperature working medium and prolonging the operation time are achieved, and meanwhile, the purposes of reducing the load of the low-temperature working medium which flows back in a treatment device on a heat regenerator and improving the operation safety of the system can be achieved.)

1. A pressure control method of a high-low temperature compound type treatment system is characterized by comprising the following operation steps:

s1: judging whether the number of the opened low-temperature working medium output channels in the high-low temperature compound treatment system is changed or not, if not, executing the step S2;

s2: judging whether the number of the opened low-temperature working medium output channels in the high-low temperature compound treatment system is less than or equal to the preset number, if so, executing a step S3; if not, go to step S4;

s3: judging whether the temperature of the low-temperature working medium in the high-low temperature compound treatment system meets a first temperature condition or not, and if so, executing pressure regulation operation S5;

s4: judging whether the temperature of the low-temperature working medium in the high-low temperature compound treatment system meets a second temperature condition or not, and if so, executing pressure regulation operation S5;

s5: adjusting the pressure P of the low-temperature working medium in the high-low temperature compound treatment system to a target pressure P_s；

Wherein the target pressure P_sSatisfying one of the following expressions:

P_s=P_s’-P₁；

P_s=P_s'; and

P_s=P_s’+P₁；

wherein, P_s' is the currently set target pressure;

P₁is a constant.

2. The pressure control method of the high and low temperature composite therapeutic system according to claim 1, wherein the first temperature condition is: temperature T of low-temperature working medium output to therapeutic apparatus_{Go out}＜T_{Outlet preset}；

The second temperature condition is: temperature T of low-temperature working medium output to therapeutic apparatus_{Go out}＜T_{Outlet preset}And the temperature T of the low-temperature working medium flowing back from the therapeutic apparatus_{Go back to}＜T_{Return preset}；

Wherein, T_{Outlet preset}For outputting the low-temperature working medium to a preset temperature, T, of the therapeutic apparatus_{Return preset}Is a preset temperature of the reflux from the therapeutic device.

3. The pressure control method of the high-low temperature composite therapeutic system according to claim 1 or 2, wherein the step S5 comprises the following sub-steps:

s51: judging whether the pressure P of the low-temperature working medium in the high-low temperature combined treatment system is less than the currently set target pressure P_s' and P₂The difference between the values of the first and second thresholds, if so,step S53 is executed;

s53: judging the temperature T of the low-temperature working medium flowing back from the therapeutic apparatus_{Go back to}Whether or not less than T_{Return preset}If yes, go to step S55;

s55: judging the temperature T of the low-temperature working medium flowing back from the therapeutic apparatus_{Go back to}Less than T_{Return preset}Whether the duration of (a) is greater than a first preset time T₁If yes, go to step S56; if not, go to step S10;

s56: adjusting the pressure P of the low-temperature working medium in the high-low temperature compound treatment system to a target pressure P_sAnd returns to perform step S10; wherein the target pressure P_s=P_s’-P₁；

Step S10: acquiring the pressure limit value of a therapeutic apparatus and the number of low-temperature working medium output channels opened in a high-low temperature combined type therapeutic system;

wherein, P₂Is a constant;

P₂is a reaction with P₁Different constants.

4. The pressure control method of the high-low temperature combined treatment system according to claim 3, wherein in step S51, if the pressure P of the low-temperature working medium in the high-low temperature combined treatment system is greater than or equal to the currently set target pressure P_s' and P₂If there is a difference, go to step S52;

s52: judging whether the pressure P of the low-temperature working medium in the high-low temperature combined treatment system meets the following definition formula:

P≤（P_s’+P₂）；

if so, go to step S53, otherwise, go to step S10.

5. The pressure control method of claim 4, wherein in step S53, if the temperature T of the low temperature working medium flowing back from the therapeutic apparatus is lower than the temperature T of the low temperature working medium flowing back from the therapeutic apparatus_{Go back to}Not less than T_{Return preset}Then go to step S54;

s54: high-low temperature combined treatment systemAdjusting the pressure P of the medium-low temperature working medium to a target pressure P_sAnd returns to step S10; wherein the target pressure P_s=P_s’+P₁。

6. The pressure control method of the high and low temperature composite therapeutic system according to claim 4, wherein the step S5 further comprises the following sub-steps:

s510: judging whether the pressure P of the low-temperature working medium in the high-low temperature combined treatment system is larger than the currently set target pressure P or not_s' and P₂If yes, go to step S520;

s520: judging whether the number of the opened low-temperature working medium output channels in the high-low temperature combined treatment system is less than or equal to the preset number, if not, executing the step S530; if yes, go to step S540;

s530: adjusting the pressure P of the low-temperature working medium in the high-low temperature compound treatment system to the currently set target pressure P_s' and returns to step S10;

s540: obtaining the pressure P of the low-temperature working medium in the current high-low temperature combined treatment system_nAnd then the timing is started,

s550: judging whether the time Ti reaches a second preset time T₂If yes, go to step S560; if not, returning to the step S10;

s560: judging whether the pressure P of the low-temperature working medium in the high-low temperature combined treatment system is larger than P_n-P₃If yes, go to step S570; if not, go to step S580;

s570: let Ti =0 and return to step S10;

s580: adjusting the pressure P of the low-temperature working medium in the high-low temperature compound treatment system to a target pressure P_sAnd returns to step S10; wherein the target pressure P_s=P_s’；

Wherein, P₃A constant.

7. The pressure control method of the high-low temperature combined treatment system as claimed in claim 4, wherein in step S1, if the number of the opened low-temperature working medium output channels in the high-low temperature combined treatment system changes, step S6 is executed;

s6: judging whether the pressure P of the low-temperature working medium in the high-low temperature combined treatment system is in the process of adjusting, if so, executing step S7; if not, returning to the step S10;

s7: judging whether the number of the opened low-temperature working medium output channels in the high-low temperature compound treatment system is increased, if so, executing the step S9; if not, go to step S11;

step S9: the process of adjusting the pressure P of the low-temperature working medium in the high-low temperature compound treatment system is quitted and the step S10 is returned;

step S11: and continuing to adjust the process of the pressure P of the low-temperature working medium in the high-low temperature compound treatment system and returning to the step S10.

8. The pressure control method of the high-low temperature combined treatment system according to claim 7, wherein in step S530, the pressure P of the low-temperature working medium in the high-low temperature combined treatment system is adjusted to the target pressure P by opening the release valve_s。

9. The pressure control method of the high and low temperature combined therapy system according to claim 7, further comprising step S8: maintaining the highest working pressure in the high-low temperature compound therapeutic system and returning to the step S9;

in the step S3, if the temperature of the low-temperature working medium in the high-low temperature combined treatment system does not meet the first temperature condition, executing the step S8;

in step S4, if the temperature of the low-temperature working medium in the high-low temperature compound therapy system does not satisfy the second temperature condition, step S8 is executed.

10. A high and low temperature composite treatment system, comprising:

a low-temperature working medium unit in which a low-temperature working medium is stored,

the low-temperature working medium conveying channel is respectively connected with the low-temperature working medium unit and the therapeutic apparatus and is used for conveying the low-temperature working medium in the low-temperature working medium unit to the therapeutic apparatus;

the therapeutic apparatus is used for receiving the low-temperature working medium and executing therapeutic operation;

a temperature monitoring unit connected with the therapeutic apparatus for monitoring the temperature T of the low-temperature working medium output to the therapeutic apparatus_{Go out}And a preset temperature T of reflux from the therapeutic device_{Return preset}(ii) a And

a control unit electrically connected to the low-temperature working medium delivery passage, the low-temperature working medium unit and the temperature monitoring unit, respectively, wherein the control unit controls the pressure of the low-temperature working medium delivered to the therapeutic apparatus by using the pressure control method of the high-low temperature combined type therapeutic system according to any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of ablation treatment, in particular to a high-low temperature combined treatment system and a pressure control method thereof.

Background

The high-low temperature combined treatment system is an advanced tumor minimally invasive treatment system integrating deep low-temperature cryotherapy and high-temperature thermotherapy functions, and the system kills targeted tumor cells at low temperature through the early-stage freezing and cooling effect. When the cold tank is clinically used, the working pressure of the cold tank storing the low-temperature working medium is in a high-pressure state, the high pressure can improve the cooling rate and accelerate the time of freezing and cooling to the target low temperature, but the high pressure can cause the consumption of the low-temperature working medium to be increased after the target temperature is reached; a large amount of low-temperature working media enter the return pipeline without complete heat exchange of the ablation needle, and redundant low-temperature working media increase the load of the heat regenerator, so that the heat regenerator cannot convert all low-temperature working media into normal-temperature nitrogen to be discharged, untreated low-temperature working media are directly discharged, the environment of an operating room is affected, and waste is caused.

Disclosure of Invention

The invention provides a high-low temperature combined type treatment system and a pressure control method thereof, which are used for adjusting the working pressure of a low-temperature working medium, so that the consumption of the low-temperature working medium is relatively reduced, and the running time is prolonged.

According to a first aspect of the present invention, the present invention provides a pressure control method for a high-low temperature compound therapy system, comprising the following steps:

s1: judging whether the number of the opened low-temperature working medium output channels in the high-low temperature compound treatment system is changed or not, if not, executing the step S2;

s2: judging whether the number of the opened low-temperature working medium output channels in the high-low temperature compound treatment system is less than or equal to the preset number, if so, executing a step S3; if not, go to step S4;

s3: judging whether the temperature of the low-temperature working medium in the high-low temperature compound treatment system meets a first temperature condition or not, and if so, executing pressure regulation operation S5;

s4: judging whether the temperature of the low-temperature working medium in the high-low temperature compound treatment system meets a second temperature condition or not, and if so, executing pressure regulation operation S5;

s5: adjusting the pressure P of the low-temperature working medium in the high-low temperature compound treatment system to a target pressure P_s；

Wherein the target pressure P_sSatisfying one of the following expressions:

P_s=P_s’-P₁；

P_s=P_s'; and

P_s=P_s’+P₁；

wherein, P_s' is the currently set target pressure;

P₁is a constant.

In one embodiment, the first temperature condition is: temperature T of low-temperature working medium output to therapeutic apparatus_{Go out}＜T_{Outlet preset}；

The second temperature condition is: temperature T of low-temperature working medium output to therapeutic apparatus_{Go out}＜T_{Outlet preset}And the temperature T of the low-temperature working medium flowing back from the therapeutic apparatus_{Go back to}＜T_{Return preset}；

Wherein, T_{Outlet preset}For outputting the low-temperature working medium to a preset temperature, T, of the therapeutic apparatus_{Return preset}Is a preset temperature of the reflux from the therapeutic device.

In one embodiment, step S5 includes the following sub-steps:

s51: judging whether the pressure P of the low-temperature working medium in the high-low temperature combined treatment system is less than the currently set target pressure P_s' and P₂If so, go to step S53;

s53: judging the temperature T of the low-temperature working medium flowing back from the therapeutic apparatus_{Go back to}Whether or not less than T_{Return preset}If yes, go to step S55;

s55: judging the temperature T of the low-temperature working medium flowing back from the therapeutic apparatus_{Go back to}Less than T_{Return preset}Whether the duration of (a) is greater than a first preset time T₁If yes, go to step S56; if not, go to step S10;

s56: adjusting the pressure P of the low-temperature working medium in the high-low temperature compound treatment system to a target pressure P_sAnd returns to perform step S10; wherein the target pressure P_s=P_s’-P₁；

Step S10: acquiring the pressure limit value of a therapeutic apparatus and the number of low-temperature working medium output channels opened in a high-low temperature combined type therapeutic system;

wherein, P₂Is a constant;

P₂is a reaction with P₁Different constants.

In a fruitIn the embodiment, in step S51, if the pressure P of the low-temperature working medium in the high-low temperature compound therapy system is greater than or equal to the currently set target pressure P_s' and P₂If there is a difference, go to step S52;

s52: judging whether the pressure P of the low-temperature working medium in the high-low temperature combined treatment system meets the following definition formula:

（P_s’-P₂）≤P≤（P_s’+P₂）；

if so, go to step S53, otherwise, go to step S10.

In one embodiment, in step S53, if the temperature T of the low-temperature working medium flowing back from the therapeutic apparatus is lower than the temperature T of the low-temperature working medium flowing back from the therapeutic apparatus_{Go back to}Not less than T_{Return preset}Then go to step S54;

s54: adjusting the pressure P of the low-temperature working medium in the high-low temperature compound treatment system to a target pressure P_sAnd returns to step S10; wherein the target pressure P_s=P_s’+P₁。

In one embodiment, step S5 further includes the following sub-steps:

s510: judging whether the pressure P of the low-temperature working medium in the high-low temperature combined treatment system is larger than the currently set target pressure P or not_s' and P₂If yes, go to step S520;

s520: judging whether the number of the opened low-temperature working medium output channels in the high-low temperature combined treatment system is less than or equal to the preset number, if not, executing the step S530; if yes, go to step S540;

s530: adjusting the pressure P of the low-temperature working medium in the high-low temperature compound treatment system to the currently set target pressure P_s’；

S540: obtaining the pressure P of the low-temperature working medium in the current high-low temperature combined treatment system_nAnd then the timing is started,

s550: judging whether the time Ti reaches a second preset time T₂If yes, go to step S560; if not, returning to the step S10;

s560: judging whether the pressure P of the low-temperature working medium in the high-low temperature combined treatment system is larger than P_n-P₃If yes, go to step S570; if not, go to step S580;

s570: let Ti =0 and return to step S10;

s580: adjusting the pressure P of the low-temperature working medium in the high-low temperature compound treatment system to a target pressure P_sAnd returns to step S10; wherein the target pressure P_s=P_s’；

Wherein, P₃A constant.

In one embodiment, in step S1, if the number of the opened low-temperature working medium output channels in the high-low temperature compound treatment system changes, step S6 is executed;

s6: judging whether the pressure P of the low-temperature working medium in the high-low temperature combined treatment system is in the process of adjusting, if so, executing step S7; if not, returning to the step S10;

s7: judging whether the number of the opened low-temperature working medium output channels in the high-low temperature compound treatment system is increased, if so, executing the step S9; if not, go to step S11;

step S9: the process of adjusting the pressure P of the low-temperature working medium in the high-low temperature compound treatment system is quitted and the step S10 is returned;

step S11: and continuing to adjust the process of the pressure P of the low-temperature working medium in the high-low temperature compound treatment system and returning to the step S10.

In one embodiment, in step S530, the pressure P of the low-temperature working medium in the high-low temperature combined treatment system is adjusted to the target pressure P by opening the deflation valve_s。

In one embodiment of the method of the present invention,

further comprising step S8: maintaining the highest working pressure in the high-low temperature compound therapeutic system and returning to the step S9;

in the step S3, if the temperature of the low-temperature working medium in the high-low temperature combined treatment system does not meet the first temperature condition, executing the step S8;

in step S4, if the temperature of the low-temperature working medium in the high-low temperature compound therapy system does not satisfy the second temperature condition, step S8 is executed.

According to a second aspect of the present invention, there is provided a combined high and low temperature therapy system comprising:

a low-temperature working medium unit in which a low-temperature working medium is stored,

the low-temperature working medium conveying channel is respectively connected with the low-temperature working medium unit and the therapeutic apparatus and is used for conveying the low-temperature working medium in the low-temperature working medium unit to the therapeutic apparatus;

the therapeutic apparatus is used for receiving the low-temperature working medium and executing therapeutic operation; and

a temperature monitoring unit connected with the therapeutic apparatus for monitoring the temperature T of the low-temperature working medium output to the therapeutic apparatus_{Go out}And a preset temperature T of reflux from the therapeutic device_{Return preset}(ii) a And

and the control unit is electrically connected with the low-temperature working medium conveying channel, the low-temperature working medium unit and the temperature monitoring unit respectively, and controls the pressure of the low-temperature working medium conveyed to the therapeutic apparatus by adopting the pressure control method of the high-low temperature combined type therapeutic system. Compared with the prior art, the invention has the advantages that,

(1) whether the temperature of the low-temperature working medium output by the high-low temperature combined treatment system (hereinafter referred to as the system) is stabilized within a certain range or not is judged according to the first temperature condition and the second temperature condition, and then a measure for reducing the pressure of the low-temperature working medium output by the system in a segmented manner can be taken, so that the purposes of reducing the consumption of the low-temperature working medium and prolonging the operation time are achieved, and meanwhile, the purposes of reducing the burden of the low-temperature working medium which flows back in a treatment device on a heat regenerator and improving the operation safety of the system can be achieved.

(2) The operating state of the system is determined by measuring the temperature of each node when the system operates, so that whether pressure control can be performed or not is judged, and the consistency among equipment can be improved.

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 for pressure control of a high-low temperature hybrid therapy system in accordance with an embodiment of the present invention;

FIG. 2 illustrates the operation of the high and low temperature hybrid therapy system according to an embodiment of the present invention;

fig. 3 shows the operation of the high-low temperature hybrid therapy system without the pressure control method of the high-low temperature hybrid therapy system according to the embodiment of the present invention.

Detailed Description

The invention will be further explained with reference to the drawings.

As shown in fig. 1 and 2, according to a first aspect of the present invention, the present invention provides a pressure control method for a high-low temperature composite therapeutic system, comprising the following steps:

after the system is turned on (started), step S10 is executed. The above-described system is not limited to the high and low temperature combined treatment system of the present invention.

Step S10: and acquiring the pressure limit value of the therapeutic apparatus and the number of the opened low-temperature working medium output channels in the high-low temperature compound therapeutic system, and executing the step S1.

Wherein, the therapeutic apparatus can be an ablation needle, and the low-temperature working medium can be liquid nitrogen. Since the ablation needles have different needle types, the pressure limit value for each needle type is different. Therefore, before pressure control is started, the pressure limit value of the ablation needle needs to be acquired so as to ensure that the pressure of the low-temperature working medium is not lower than the pressure limit value when the pressure is adjusted.

In addition, the low-temperature working medium conveying channel is controlled to be opened or closed by a cold valve. Therefore, the number of opened low-temperature working medium output channels can be determined by counting the number of opened cold valves.

Step S1: and judging whether the number of the opened low-temperature working medium output channels in the high-low temperature combined treatment system is changed, if not, indicating that the number of the low-temperature working medium output channels is not changed, indicating that the working pressure of the current system can meet the temperature required by the low-temperature working medium, and executing the step S2. On the contrary, if the number of the opened low-temperature working medium output channels in the high-low temperature compound treatment system is changed, the step S6 is executed.

The low-temperature working medium output channel is a channel for conveying low-temperature working medium from a low-temperature working medium unit (such as a cold tank) in the high-low temperature combined treatment system to a treatment instrument.

Step S2: it is determined whether the number of the opened low-temperature working medium output channels in the high-low temperature compound treatment system is less than or equal to a predetermined number (for example, may be 2, which is obtained through experience), if so, it indicates that the number of the opened cold valves is less than or equal to 2, at this time, since the number of the opened low-temperature working medium output channels is small, the low-temperature working medium amount consumed in the high-pressure state is relatively small, and step S3 may be executed. On the contrary, if the number of the opened low-temperature working medium output channels in the high-low temperature combined treatment system is greater than the predetermined number, and therefore the number of the opened low-temperature working medium output channels is large, the low-temperature working medium consumption will be increased by the high-pressure output in a short time, and the step S4 can be executed.

Step S3: judging whether the temperature of the low-temperature working medium in the high-low temperature compound treatment system meets a first temperature condition or not, if so, executing a pressure adjusting operation step S5; if not, step S8 is executed.

Wherein the first temperature condition is: temperature T of low-temperature working medium output to therapeutic apparatus_{Go out}＜T_{Outlet preset}The temperature T of the low-temperature working medium output to the therapeutic apparatus_{Go out}Refers to the temperature at all outlets of the system.

Step S4: judging whether the temperature of the low-temperature working medium in the high-low temperature compound treatment system meets a second temperature condition or not, and if so, executing pressure regulation operation S5; if not, go to step S8.

Wherein the second temperature condition is: temperature T of low-temperature working medium output to therapeutic apparatus_{Go out}＜T_{Outlet preset}And the temperature T of the low-temperature working medium flowing back from the therapeutic apparatus_{Go back to}＜T_{Return preset}(ii) a Temperature T of low-temperature working medium from back flow of therapeutic apparatus_{Go back to}Refers to the temperature of all return ports that return from the therapeutic device.

Wherein, T_{Outlet preset}For outputting the low-temperature working medium to a preset temperature, T, of the therapeutic apparatus_{Return preset}Is a preset temperature of the reflux from the therapeutic device.

I.e. when the cold valve in the system is openThe number is less than or equal to 2, and the low-temperature working medium is output to the temperature T of the therapeutic apparatus_{Go out}＜T_{Outlet preset}The temperature of the current low-temperature working medium can meet the temperature requirement of treatment, so that the pressure of the low-temperature working medium can be adjusted. On the contrary, when the number of the opened cold valves in the system is more than 2, the temperature T of the therapeutic apparatus is only output when the low-temperature working medium is output_{Go out}＜T_{Outlet preset}And the temperature T of the low-temperature working medium flowing back from the therapeutic apparatus_{Go back to}＜T_{Return preset}In the meantime, the pressure of the low-temperature working medium can be adjusted.

In other words, in the present application, it is determined whether to enter the pressure regulation process by using the certain boundary condition described above by determining whether the number of cold valves that are opened is less than the predetermined number.

And in the initial stage of the system entering the low-temperature refrigeration work, the pressure P of the low-temperature working medium is not subjected to pressure reduction operation, so that the high-pressure state is maintained. In the initial working stage, the working temperature of the low-temperature working medium cannot be reached between each pipeline and the connecting part of the system, so that the high pressure of the low-temperature working medium needs to be maintained, and the treatment temperature of the low-temperature working medium is ensured. And when the temperature of the therapeutic apparatus reaches the target temperature and is stabilized for a period of time, the temperature between each pipeline and each component is precooled to be close to the temperature of the low-temperature working medium, so that the pressure reduction process can be carried out.

Step S5: adjusting the pressure P of the low-temperature working medium in the high-low temperature compound treatment system to a target pressure P_s；

Wherein the target pressure P_sSatisfying one of the following expressions:

P_s=P_s’-P₁；

P_s=P_s'; and

P_s=P_s’+P₁；

wherein, P_s' is the currently set target pressure;

P₁is a constant dependent on pressure, e.g. P₁May be 50 kPa.

In addition, P is_sIs the currently set target pressure, that is to sayP_s' is a variable target pressure range, and after each cycle is completed, the currently set target pressure P can be set according to the operation condition of the system_s'. For example, the initial pressure at which the system operates is 1000kPa, i.e., this currently set target pressure P_s' 1000 kPa. The currently set target pressure P may be set after the first cycle is completed_s' adjusted to (900 + -30) kPa, the currently set target pressure P can be set after the second cycle is completed_s' adjustment to (800 + -30) kPa, the currently set target pressure P can be set after the nth cycle is completed_s' adjusted to (500 + -30) kPa, etc. Wherein + -30 is an allowable tolerance range.

Therefore, after each cycle is completed, the pressure P of the low temperature working medium in the high and low temperature compound therapeutic system is adjusted to the target pressure P in step S5_sActually based on the currently set target pressure P_s' to make adjustments. Therefore, the pressure regulation of the low-temperature working medium of the system is not limited to reducing the pressure of the low-temperature working medium, and the pressure of the low-temperature working medium can be regulated to be the target pressure according to the requirement, or the pressure of the low-temperature working medium is increased when the temperature of the low-temperature working medium cannot meet the treatment requirement.

It is understood that the present invention is described by P₁The pressure P of the low-temperature working medium of the system is gradually adjusted in sections for one adjusting unit (or pressure interval), and the next pressure interval is entered only when the temperature condition is met, namely the temperature of the therapeutic apparatus in the current pressure interval can be kept within the target temperature range.

Step S6: judging whether the pressure P of the low-temperature working medium in the high-low temperature combined treatment system is in the process of adjusting, if so, executing step S7; if not, the process returns to step S10, and the recording is resumed.

Step S7: judging whether the number of the opened low-temperature working medium output channels in the high-low temperature combined treatment system is increased, if so, quitting the process of adjusting the pressure P of the low-temperature working medium in the high-low temperature combined treatment system; if not, step S11 is executed.

Step S8: the highest working pressure in the hyperthermia and hypothermia combined treatment system is maintained and the process returns to step S9.

Step S9: and exiting the process of adjusting the pressure P of the low-temperature working medium in the high-low temperature compound treatment system and returning to the step S10.

Step S11: and continuing to adjust the process of the pressure P of the low-temperature working medium in the high-low temperature compound treatment system and returning to the step S10.

The above three schemes of step S5 will be described in detail.

In a specific embodiment, step S5 includes the following sub-steps:

step S510: judging whether the pressure P of the low-temperature working medium in the high-low temperature combined treatment system is larger than the currently set target pressure P or not_s' and P₂The sum, i.e. determining P > (P)_s’+P₂) If yes, go to step S520.

Wherein, P₂Is a constant related to the pressure, which may be 40kPa, for example.

Step S520: judging whether the number of the opened low-temperature working medium output channels in the high-low temperature compound treatment system is less than or equal to a preset number (for example, the preset number is 2), if not, adjusting the pressure in a forced adjustment mode, namely executing the step S530; if yes, step S540 may be executed by a natural voltage reduction method.

Step S530: adjusting the pressure P of the low-temperature working medium in the high-low temperature compound treatment system to the currently set target pressure P_s'. Specifically, the pressure P of the low-temperature working medium in the high-low temperature combined treatment system can be quickly adjusted to the currently set target pressure P by opening the air release valve_s’。

Step S540: obtaining the pressure P of the low-temperature working medium in the current high-low temperature combined treatment system_nAnd starts timing.

Step S550: judging whether the time Ti reaches a second preset time T₂If yes, go to step S560; if not, the process returns to step S10.

Step S560: judging pressure of low-temperature working medium in high-low temperature combined treatment systemWhether P is greater than P_n-P₃If not, go to step S580; if yes, go to step S570; .

Step S570: let Ti =0 and return to step S10.

Step S580: adjusting the pressure P of the low-temperature working medium in the high-low temperature compound treatment system to a target pressure P_sAnd returns to step S10; wherein the target pressure P_s=P_s’。

Wherein, P₃May be a constant related to the rate of depressurization, which may be obtained by the rate of depressurization and the corresponding time, e.g. P₃May be 30 kPa.

In other words, when the number of open low-temperature working medium outlet channels is less than or equal to 2, the target pressure can be adjusted by monitoring the pressure in a certain time period. For example, at a second preset time T₂(for example, 30 s), if the depressurization speed of the low-temperature working medium exceeds 1kPa/s, the pressure P of the low-temperature working medium in the high-low temperature compound treatment system can be adjusted to be the target pressure P_s. And if the depressurization speed of the low-temperature working medium does not exceed 1kPa/s, stopping the depressurization process.

Otherwise, when the second preset time T is reached₂And if the decompression speed of the low-temperature working medium does not exceed 1kPa/s, the Ti is made to be zero, and the next time monitoring interval is returned.

Step S5 further includes the following sub-steps:

step S51: judging whether the pressure P of the low-temperature working medium in the high-low temperature combined treatment system is less than the currently set target pressure P_s' and P₂If the difference is positive, step S53 is executed.

It is understood that in step S510, if P > (P)_s’+P₂) If not, step S51 can be executed, i.e., the pressure of the low-temperature working medium is not greater than P_s’+P₂。

In step S51, if P < (P) _s’-P₂) If true, step S53 is performed. If P < (P)_s’-P₂) If not, judging the pressure interval of the low-temperature working medium, namely executing the stepStep S52.

Step S52: judging whether the pressure P of the low-temperature working medium in the high-low temperature combined treatment system meets the following definition formula:

P≤（P_s’+P₂）；

if yes, go to step S53; if not, step S10 is executed. In other words, if the pressure P of the low-temperature working medium is at the current target pressure P_sWithin. + -. 40kPa of' can be carried out in the next step.

Note that, when the determination is made in step S52, since the pressure changes from moment to moment, there is a possibility that the pressure P of the low-temperature working medium is not satisfied (P)_s’-P₂）≤P≤（P_s’+P₂) Then it is sufficient to return to step S10 directly, so as to avoid the system getting into a dead loop.

Step S53: judging the temperature T of the low-temperature working medium flowing back from the therapeutic apparatus_{Go back to}Whether or not less than T_{Return preset}If yes, go to step S55; if not, step S54 is executed.

That is to say the temperature T at which the cryogenic working medium flows back from the treatment device_{Go back to}＜T_{Return preset}This indicates that the temperature of the cryogenic working fluid is sufficient for the treatment, so that pressure reduction measures can be taken, for example step S55 can be executed. On the contrary, when the temperature T of the low-temperature working medium flowing back from the therapeutic apparatus_{Go back to}≥T_{Return preset}It is indicated that the temperature of the cryogenic fluid does not meet the therapeutic requirements and therefore the pressure needs to be increased to lower the temperature of the cryogenic fluid, for example step S54 may be performed.

Step S54: adjusting the pressure P of the low-temperature working medium in the high-low temperature compound treatment system to a target pressure P_sAnd returns to step S10; wherein the target pressure P_s=P_s’+P₁Subsequently, it returns to step S10.

Step S55: judging the temperature T of the low-temperature working medium flowing back from the therapeutic apparatus_{Go back to}Less than T_{Return preset}Whether the duration of (a) is greater than a first preset time T₁If yes, go to step S56; if not, executing the stepStep S10.

Step S56: adjusting the pressure P of the low-temperature working medium in the high-low temperature compound treatment system to a target pressure P_sAnd returns to perform step S10; wherein the target pressure P_s=P_s’-P₁Subsequently, it returns to step S10.

That is to say the temperature T at which the cryogenic working medium flows back from the treatment device_{Go back to}＜T_{Return preset}And the temperature T of the low-temperature working medium flowing back from the therapeutic apparatus_{Go back to}Can be continuously at the first preset time T₁All are less than T_{Return preset}Therefore, it is possible to take the measure of step-down, i.e. to adjust the target pressure P_sTo be higher than the current target pressure P_s' 50kPa less.

The low-temperature medium can be liquid nitrogen, the critical temperature Tc of the liquid nitrogen is =126.2K (-147 ℃), the critical pressure Pc is =3.4MPa, and the critical density is 313.3kg/m 3. The pressure of the liquid ammonia is thus adjusted, and the temperature thereof can be changed. Therefore, the temperature T of the low-temperature working medium output to the therapeutic apparatus is determined according to the working state, the number of the opened low-temperature working medium output channels and the temperature T of the low-temperature working medium output to the therapeutic apparatus_{Go out}And the temperature T of the return flow of the cryogenic working medium from the treatment device_{Go back to}The running condition of the system is judged, so that the system is maintained in the optimal running state by selecting proper pressure, and the purposes of high freezing and cooling speed, low-temperature working medium consumption reduction and long-time running are achieved.

Example 1

As shown in FIG. 2, the pressure control method of the present invention is used in the operation of the combined high and low temperature treatment system. Wherein the liquid level curve of the cooling tank shows that the low-temperature working medium in the cooling tank is continuously consumed along with the time, so that the liquid level is continuously reduced. The cold tank pressure curve shows that the pressure P of the cryogenic fluid (or cold tank pressure) is maintained within a substantially steady range for a period of time prior to time 2:00, at which the system operates. During the period between the time 2:00 and the time 12:00, the pressure P of the low-temperature working medium is gradually reduced, and the system operates under the reduced pressure. The pressure P of the cryogenic working fluid continues to remain within the substantially steady lower pressure range for a period of time after time 12:00, at which the system operates.

Under the pressure curve, the outlet temperature T of the low-temperature working medium output to the therapeutic apparatus can be obtained_{Go out}And the return temperature T of the cryogenic working medium from the treatment device_{Go back to}As shown by the two curves in the lower half of fig. 2.

Further, in this embodiment, the theoretical value of the low-temperature working medium content in the cooling tank of the system is 100%, which is actually influenced by various factors such as the environment, and the low-temperature working medium content in the cooling tank of the system is 97%.

After the system operation is finished, the residual content of the low-temperature working medium in the cooling tank of the system is 61%, so that the consumption of the low-temperature working medium in the system operation is (97% -61%) = 36%.

Comparative example 1

This comparative example 1 employs the same high and low temperature hybrid treatment system of the present invention, except that the pressure is not adjusted by the method of the present invention. In other words, in the operation of the high-low temperature compound therapy system of the comparative example 1, the pressure P of the low-temperature working medium is not adjusted, and the high-low temperature compound therapy system always operates according to a fixed pressure value, such as the pressure curve shown in fig. 3. Under the pressure curve, the outlet temperature of the low-temperature working medium output to the therapeutic apparatus and the reflux temperature of the low-temperature working medium from the therapeutic apparatus can be obtained, as shown by the two curves at the lower half of fig. 3.

Further, in this comparative example, the content of the low-temperature working medium in the cooling tank of the system was 97%. After the system operation is finished, the residual content of the low-temperature working medium in the cooling tank of the system is 45%, so that the consumption of the low-temperature working medium in the system operation is (97% -45%) = 52%.

Comparing the temperature curve of fig. 2 with the temperature curve of fig. 3, it can be seen that the temperature curves of the two are substantially the same, i.e. the temperature curve obtained by the pressure control method of the present invention is not much different from the temperature curve obtained by the pressure P of the unadjusted low-temperature working medium. In addition, in the temperature curves shown in fig. 2 and 3, the time when the temperature shown in fig. 2 is reduced to the lowest is between 4:00 and 6:00, and the time when the temperature shown in fig. 3 is reduced to the lowest is after 6:00, so that when the pressure control method of the present invention is used, the time when the outlet temperature and the reflux temperature of the low-temperature working medium output to the therapeutic apparatus are reduced to the lowest is earlier than the time when the outlet temperature and the reflux temperature of the low-temperature working medium output to the therapeutic apparatus are reduced to the lowest when the pressure P of the low-temperature working medium is not adjusted. In other words, the desired outlet and return temperatures can be achieved more quickly when operating with the pressure control method of the present invention. Therefore, the pressure control method can be used for operating the high-low temperature combined treatment system, can completely meet the requirement of treatment temperature, and has performance superior to the operation performance of the system without pressure control.

Based on the above analysis, the time when the system shown in fig. 2 reaches the lowest temperature is earlier than the time when the system shown in fig. 3 reaches the lowest temperature, so that the system shown in fig. 2 can enter the pressure reduction process more quickly, and the consumption of the low-temperature working medium is saved. As described above, the low-temperature working medium consumption of the system shown in fig. 2 is 36% when operating, and the low-temperature working medium consumption of the system shown in fig. 3 is 52%, that is, the low-temperature working medium is saved by (52% -36%) =17% when operating the system shown in fig. 2. Therefore, the pressure control method can save the consumption of low-temperature working medium when the high-low temperature compound treatment system is operated.

According to a second aspect of the present invention, the present invention provides a high-low temperature combined treatment system, which includes a low-temperature working medium unit, a low-temperature working medium conveying channel, a treatment apparatus, a control unit and a temperature monitoring unit.

The low-temperature working medium unit stores low-temperature working medium, and the low-temperature working medium can be liquid nitrogen, for example. The low-temperature working medium unit comprises the cooling tank and a control valve connected with the cooling tank, and the control valve is used for controlling the output speed or the output flow of the low-temperature working medium in the cooling tank.

The low-temperature working medium conveying channel is respectively connected with the low-temperature working medium unit and the therapeutic apparatus and is used for conveying the low-temperature medium in the low-temperature working medium unit to the therapeutic apparatus. The number of the low-temperature working medium conveying channels can be at least two, and each low-temperature working medium conveying channel is provided with a cold valve for controlling the on-off of the low-temperature working medium conveying channel.

The therapeutic apparatus is used for receiving the low-temperature working medium and executing therapeutic operation. The therapeutic device may be, for example, the ablation needle described above, or may be a device suitable for performing high and low temperature combined therapy, such as an ablation pen or an ablation gun.

The control unit controls the pressure of the low-temperature working medium conveyed to the therapeutic apparatus by adopting the pressure control method of the high-low temperature combined type therapeutic system. The control unit is electrically connected with the low-temperature working medium conveying channel, the low-temperature working medium unit and the temperature monitoring unit respectively. In particular, the control unit may be electrically connected to the cold valve and the control valve as described above.

The temperature monitoring unit includes a plurality of temperature sensors that may be disposed where the therapeutic device is coupled to the cryogenic delivery channel. For example, some of the temperature sensors are arranged at the inflow pipe of the therapeutic apparatus to monitor the temperature T of the low-temperature working medium output to the therapeutic apparatus_{Go out}(ii) a Further temperature sensors are arranged at the return line of the treatment device to monitor a predetermined temperature T of the return line from the treatment device_{Return preset}. The temperature monitoring unit sends the monitored temperature data to the control unit.

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.