CN112353394B - Pelvic floor muscle pressure detection device and calibration method thereof - Google Patents
Pelvic floor muscle pressure detection device and calibration method thereof Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 179
- 238000000034 method Methods 0.000 title claims abstract description 123
- 210000003205 muscle Anatomy 0.000 title claims abstract description 114
- 210000003903 pelvic floor Anatomy 0.000 title claims abstract description 114
- 230000008569 process Effects 0.000 claims abstract description 105
- 238000011897 real-time detection Methods 0.000 claims abstract description 53
- 238000012545 processing Methods 0.000 claims abstract description 47
- 239000000523 sample Substances 0.000 claims abstract description 16
- 238000012937 correction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/22—Ergometry; Measuring muscular strength or the force of a muscular blow
- A61B5/224—Measuring muscular strength
- A61B5/227—Measuring muscular strength of constricting muscles, i.e. sphincters
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
- A61B2560/02—Operational features
- A61B2560/0223—Operational features of calibration, e.g. protocols for calibrating sensors
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Abstract
The invention relates to a pelvic floor muscle pressure detection device and a calibration method thereof, wherein the detection device comprises: the pressure sensor comprises a pressure probe, a pipeline, a pressure sensor, a processing module and a calibration module; in the detection process, the pressure probe is extruded by pelvic floor muscles to deform, the gas pressure in the cavity is increased, and the pressure sensor detects the gas pressure in the cavity in real time and converts the gas pressure into an electric signal to be sent to the processing module; the processing module converts the electric signals into pelvic floor muscle pressure real-time detection data and determines whether to perform calibration processing according to the variation of the gas pressure in the cavity; when the calibration processing is needed, the processing module sends the real-time detection data of the pelvic floor muscle pressure to the calibration module; the calibration module generates pressure calibration parameters corresponding to each moment in the detection process according to the variation of the gas pressure and the time parameters of the detection process; and the processing module calibrates the pelvic floor muscle pressure real-time detection data according to the pressure calibration parameters to obtain calibrated pelvic floor muscle pressure detection result data.
Description
Technical Field
The invention relates to the technical field of pressure detection, in particular to a pelvic floor muscle pressure detection device and a calibration method thereof.
Background
The pressure probe of the existing pelvic floor muscle pressure detection device is easy to leak gas due to extrusion in the detection process, so that the detection result of the detection device has integral drift and the accuracy is reduced. At present, no calibration method is available for the detection result of the detection device for continuously leaking the gas in the detection process.
Therefore, it is necessary to provide a detecting device capable of detecting the pelvic floor muscle pressure more accurately, and a method for calibrating the detection result of the device that continuously leaks gas.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, and provides a pelvic floor muscle pressure detection device and a calibration method thereof.
To achieve the above object, in a first aspect, the present invention provides a device for detecting pelvic floor muscle pressure, the device comprising: the device comprises a pressure probe, a pipeline, a pressure sensor, a processing module and a calibration module;
The pressure probe is sleeved at one end of the pipeline, and the internal cavity of the pressure probe is communicated with the interior of the pipeline to form a chamber for accommodating gas; the pressure sensor is fixed at the other end of the pipeline and is used for detecting the gas pressure in the cavity; the pressure sensor is connected with the processing module; the processing module is connected with the calibration module;
In the detection process, the pressure probe is extruded by pelvic floor muscles to deform, the pressure of the gas in the cavity is increased, and the pressure sensor detects the pressure of the gas in the cavity in real time and converts the pressure into an electric signal to be sent to the processing module; the processing module converts the electric signals into pelvic floor muscle pressure real-time detection data, and determines whether to calibrate the pelvic floor muscle pressure real-time detection data according to the variation of the gas pressure in the chamber before and after the detection process;
When the calibration processing is needed, the processing module sends the pelvic floor muscle pressure real-time detection data to the calibration module; the calibration module generates pressure calibration parameters corresponding to each moment in the detection process according to the variation of the gas pressure and the time parameters of the detection process;
And the processing module calibrates the pelvic floor muscle pressure real-time detection data according to the pressure calibration parameters to obtain calibrated pelvic floor muscle pressure detection result data.
Preferably, the calibration module generates the pressure calibration parameter corresponding to each moment in the detection process according to the variation of the gas pressure and the time parameter of the detection process, and specifically includes:
calculating pressure calibration parameters at each moment in the detection process according to formula 1;
DeltaP i＝(P1-P2)*ti/T (1)
Wherein T is total detection duration data from a start time to an end time of the detection process, P 1 is a first reference pressure of the chamber at the start time of the detection process, P 2 is a second reference pressure of the chamber at the end time of the detection process, T i is detection duration data from the start time to the i-th time of the detection process, and Δp i is a pressure calibration parameter corresponding to the i-th time of the detection process.
Further preferably, the processing module calibrates the real-time pelvic floor muscle pressure detection data according to the pressure calibration parameter specifically includes:
calculating pelvic floor muscle pressure detection result data at each moment after calibration according to the formula 2;
P ti'＝Pti+ΔPi (2)
Wherein, P ti is the real-time detection data of pelvic floor muscle pressure at the i-th moment in the detection process, deltaP i is the pressure calibration parameter at the i-th moment in the detection process, and P ti' is the detection result data of pelvic floor muscle pressure at the i-th moment after calibration.
Preferably, when it is determined that the pelvic floor muscle pressure real-time detection data is not subjected to calibration processing, the processing module takes the pelvic floor muscle pressure real-time detection data as the pelvic floor muscle pressure detection result data.
Preferably, the detection device further includes: a cylinder;
the cylinder is arranged on the pipeline and communicated with the pipeline to form a part of the cavity.
Preferably, the detection device further includes: the air valve and the air pump;
The air valve and the air pump are respectively arranged on the pipeline;
The gas valve is used for controlling the release of gas in the cavity;
The air pump is used for inflating the cavity.
In a second aspect, the present invention provides a method for calibrating pelvic floor muscle pressure based on the device for detecting pelvic floor muscle pressure according to the first aspect, the method comprising:
Acquiring real-time detection data of pelvic floor muscle pressure in a detection process, a first reference pressure of a chamber before the detection process and a second reference pressure of a chamber after the detection process, and determining whether to calibrate the real-time detection data of pelvic floor muscle pressure according to the real-time detection data of pelvic floor muscle pressure, the first reference pressure and the second reference pressure;
when the calibration processing is determined, the calibration module generates pressure calibration parameters corresponding to each moment in the detection process according to the first reference pressure, the second reference pressure and the time parameters of the detection process;
and performing calibration processing on the pelvic floor muscle pressure real-time detection data according to the pressure calibration parameters to obtain calibrated pelvic floor muscle pressure detection result data.
Preferably, the generating, by the calibration module, a pressure calibration parameter corresponding to each moment in the detection process according to the first reference pressure, the second reference pressure and the time parameter of the detection process specifically includes:
calculating pressure calibration parameters at each moment in the detection process according to formula 1;
DeltaP i＝(P1-P2)*ti/T (1)
Wherein T is total detection duration data from a start time to an end time of the detection process, P 1 is a first reference pressure of the chamber at the start time of the detection process, P 2 is a second reference pressure of the chamber at the end time of the detection process, T i is detection duration data from the start time to the i-th time of the detection process, and Δp i is a pressure calibration parameter corresponding to the i-th time of the detection process.
Further preferably, the calibrating the pelvic floor muscle pressure real-time detection data according to the pressure calibrating parameter to obtain calibrated pelvic floor muscle pressure detection result data specifically includes:
calculating pelvic floor muscle pressure detection result data at each moment after calibration according to the formula 2;
P ti'＝Pti+ΔPi (2)
Wherein, P ti is the real-time detection data of pelvic floor muscle pressure at the i-th moment in the detection process, deltaP i is the pressure calibration parameter at the i-th moment in the detection process, and P ti' is the detection result data of pelvic floor muscle pressure at the i-th moment after calibration.
Further preferably, when it is determined that the pelvic floor muscle pressure real-time detection data is not subjected to calibration processing, the processing module takes the pelvic floor muscle pressure real-time detection data as the pelvic floor muscle pressure detection result data.
According to the pelvic floor muscle pressure detection device and the calibration method thereof, provided by the embodiment of the invention, the pelvic floor muscle pressure real-time detection data at each moment in the detection process are calibrated according to the variation of the gas pressure in the detection process, so that the accuracy of the pelvic floor muscle pressure detection result data is improved.
Drawings
FIG. 1 is a schematic diagram of a device for detecting pelvic floor muscle pressure according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for calibrating pelvic floor muscle pressure according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of real-time detection data of pelvic floor muscle pressure before correction according to an embodiment of the present invention;
Fig. 4 is a schematic diagram of corrected pelvic floor muscle pressure detection result data according to an embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
According to the pelvic floor muscle pressure detection device and the calibration method thereof, provided by the invention, the influence of leaked gas on the detection result in the detection process is reduced by adding the large-capacity cylinder, the pelvic floor muscle pressure real-time detection data at each moment in the detection process are calibrated according to the variation of the gas pressure in the detection process, and the accuracy of the pelvic floor muscle pressure detection result data is improved.
As shown in fig. 1, the device for detecting pelvic floor muscle pressure includes: a pressure probe 1, a line 2, a pressure sensor 3, a processing module 4 (not shown in the figures) and a calibration module 5 (not shown in the figures).
The pressure probe 1 is sleeved at one end of the pipeline 2, and the internal cavity of the pressure probe 1 is communicated with the interior of the pipeline 2 to form a chamber for accommodating gas. A pressure sensor 3 is fixed at the other end of the pipe 2 for detecting the gas pressure in the chamber. The pressure sensor 3 is connected with the processing module 4 by wire or wirelessly. The processing module 4 is connected with the calibration module 5 by wire or wirelessly.
The pressure probe 1 is preferably made of soft silica gel, and is easy to deform when being extruded.
In a preferred embodiment, the detection device further comprises an air valve 7 and an air pump 8. The air valve 7 and the air pump 8 are respectively arranged on the pipeline 2. A gas valve 7 for controlling the release of gas in the chamber. And an air pump 8 for inflating the chamber.
In a further preferred embodiment, the detection device further comprises a cylinder 6. The cylinder 6 is provided on the pipe 2 and communicates with the pipe 2 to form a part of the chamber. Because the air pressure in the chamber is higher than the atmospheric pressure, air leakage inevitably occurs during the detection process. When the gas content of the inner cavity of the whole detection device is y milliliters and x milliliters of air leaks in the detection process, the deviation of detection result data is in x/y, and the influence of the leaked air on the detection result data of pelvic floor muscle pressure in the detection process can be greatly reduced by increasing the air cylinder 6.
Before detection, the air valve 7 is closed to make the chamber a relatively airtight space, and then the air pump 8 is started to compress air and then transmit the compressed air to the chamber. When the pressure sensor 3 detects that the pressure of the gas in the cavity reaches the preset pressure, a feedback signal is generated, and the air pump stops inflating the cavity according to the received feedback signal, so that preparation before detection is completed.
In the detection process, the pressure probe 1 is extruded by pelvic floor muscles to deform, the pressure of gas in the cavity is increased, and the pressure sensor 3 detects the pressure of the gas in the cavity in real time and converts the pressure into an electric signal to be sent to the processing module 4. The processing module 4 converts the electric signals into real-time detection data of the pelvic floor muscle pressure, and determines whether to calibrate the real-time detection data of the pelvic floor muscle pressure according to the variation of the gas pressure in the chamber before and after the detection process.
When it is determined that the pelvic floor muscle pressure real-time detection data is not subjected to the calibration processing, the processing module 4 takes the pelvic floor muscle pressure real-time detection data as pelvic floor muscle pressure detection result data.
When the calibration process is needed, the processing module 4 sends the real-time detection data of the pelvic floor muscle pressure to the calibration module 5. The calibration module 5 generates a pressure calibration parameter corresponding to each moment in the detection process according to the variation of the gas pressure and the time parameter of the detection process.
Specifically, calculating a pressure calibration parameter at each moment in the detection process according to formula 1;
DeltaP i＝(P1-P2)*ti/T (1)
Wherein T is total detection duration data from a start time to an end time of the detection process, P 1 is a first reference pressure of the chamber at the start time of the detection process, P 2 is a second reference pressure of the chamber at the end time of the detection process, T i is detection duration data from the start time to the i-th time of the detection process, and Δp i is a pressure calibration parameter corresponding to the i-th time of the detection process.
And the processing module 4 calibrates the pelvic floor muscle pressure real-time detection data according to the pressure calibration parameters to obtain calibrated pelvic floor muscle pressure detection result data.
Specifically, calculating pelvic floor muscle pressure detection result data at each moment after calibration according to the formula 2;
P ti'＝Pti+ΔPi (2)
Wherein, P ti is the real-time detection data of pelvic floor muscle pressure at the i-th moment in the detection process, deltaP i is the pressure calibration parameter at the i-th moment in the detection process, and P ti' is the detection result data of pelvic floor muscle pressure at the i-th moment after calibration.
After the detection is completed, the air can be exhausted by opening the air valve 7.
The connection relation and the working process of all the parts of the pelvic floor muscle pressure detection device are as above. The method for calibrating pelvic floor muscle pressure provided by the present invention is explained in detail below with reference to fig. 2.
Step 110, acquiring real-time detection data of pelvic floor muscle pressure in a detection process, a first reference pressure of a chamber before the detection process and a second reference pressure of a chamber after the detection process, and determining whether to calibrate the real-time detection data of pelvic floor muscle pressure according to the real-time detection data of pelvic floor muscle pressure, the first reference pressure and the second reference pressure;
Specifically, when it is determined to perform the calibration process, step 120 is performed; when it is determined that the calibration process is not performed on the pelvic floor muscle pressure real-time detection data, step 140 is performed, and the processing module uses the pelvic floor muscle pressure real-time detection data as the pelvic floor muscle pressure detection result data.
The first reference pressure is different from the pressure threshold, and in general, the first reference pressure is smaller than the pressure threshold for controlling the air pump to be turned off because the air pump cannot stop charging immediately after receiving the feedback signal.
Step 120, the calibration module generates a pressure calibration parameter corresponding to each moment in the detection process according to the first reference pressure, the second reference pressure and the time parameter of the detection process;
Specifically, in the embodiment of the present invention, the rate at which the detection device leaks air is regarded as linear. The pressure calibration parameter pressure corresponding to each time during the detection process refers to the decrease in the gas pressure in the cavity at that time.
Calculating pressure calibration parameters at each moment in the detection process according to formula 1;
DeltaP i＝(P1-P2)*ti/T (1)
Wherein T is total detection duration data from a start time to an end time of the detection process, P 1 is a first reference pressure of the chamber at the start time of the detection process, P 2 is a second reference pressure of the chamber at the end time of the detection process, T i is detection duration data from the start time to the i-th time of the detection process, and Δp i is a pressure calibration parameter corresponding to the i-th time of the detection process.
And 130, performing calibration processing on the pelvic floor muscle pressure real-time detection data according to the pressure calibration parameters to obtain calibrated pelvic floor muscle pressure detection result data.
Specifically, the embodiment of the invention corrects the real-time pressure data of the pelvic floor muscle detected at each moment according to the corresponding reduction of the gas pressure at the moment in the detection process.
Calculating pelvic floor muscle pressure detection result data at each moment after calibration according to the formula 2;
P ti'＝Pti+ΔPi (2)
Wherein, P ti is the real-time detection data of pelvic floor muscle pressure at the i-th moment in the detection process, deltaP i is the pressure calibration parameter at the i-th moment in the detection process, and P ti' is the detection result data of pelvic floor muscle pressure at the i-th moment after calibration.
Fig. 3 and 4 are schematic diagrams of the pelvic floor muscle pressure test result data before and after correction, respectively. It can be seen from fig. 3 that the real-time detection data of pelvic floor muscle pressure before correction is increased along with the increase of detection time, and the whole data is shifted downwards, but after correction by the correction method according to the embodiment of the invention, as shown in fig. 4, the pelvic floor muscle pressure detection result data shows normal fluctuation.
According to the pelvic floor muscle pressure detection device and the calibration method thereof, provided by the invention, the influence of leaked gas on the detection result in the detection process is reduced by adding the large-capacity cylinder, the pelvic floor muscle pressure real-time detection data at each moment in the detection process are calibrated according to the variation of the gas pressure in the detection process, and the accuracy of the pelvic floor muscle pressure detection result data is improved.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of function in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied in hardware, in a software module executed by a processing module, or in a combination of the two. The software modules may be disposed in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (2)
1. A device for detecting pelvic floor muscle pressure, the device comprising: the device comprises a pressure probe, a pipeline, a pressure sensor, a processing module and a calibration module;
The pressure probe is sleeved at one end of the pipeline, and the internal cavity of the pressure probe is communicated with the interior of the pipeline to form a chamber for accommodating gas; the pressure sensor is fixed at the other end of the pipeline and used for detecting the gas pressure in the cavity; the processing module is connected with the calibration module;
In the detection process, the pressure probe is extruded by pelvic floor muscles to deform, the pressure of the gas in the cavity is increased, and the pressure sensor detects the pressure of the gas in the cavity in real time and converts the pressure into an electric signal to be sent to the processing module; the processing module converts the electric signals into pelvic floor muscle pressure real-time detection data, and determines whether to calibrate the pelvic floor muscle pressure real-time detection data according to the variation of the gas pressure in the chamber before and after the detection process;
When the real-time detection data of the pelvic floor muscle pressure is determined not to be calibrated, the processing module takes the real-time detection data of the pelvic floor muscle pressure as the detection result data of the pelvic floor muscle pressure;
When the calibration processing is needed, the processing module sends the pelvic floor muscle pressure real-time detection data to the calibration module; the calibration module generates pressure calibration parameters corresponding to each moment in the detection process according to the variation of the gas pressure and the time parameters of the detection process;
the calibration module generates pressure calibration parameters corresponding to each moment in the detection process according to the variation of the gas pressure and the time parameters of the detection process, and specifically comprises the following steps:
calculating pressure calibration parameters at each moment in the detection process according to formula 1;
ΔP i=(P1-P2)*ti/T type 1
Wherein T is total detection duration data from a start time to an end time of the detection process, P 1 is a first reference pressure of the chamber at the start time of the detection process, P 2 is a second reference pressure of the chamber at the end time of the detection process, T i is detection duration data from the start time to the i-th time of the detection process, and Δp i is a pressure calibration parameter corresponding to the i-th time of the detection process;
The processing module calibrates the pelvic floor muscle pressure real-time detection data according to the pressure calibration parameters to obtain calibrated pelvic floor muscle pressure detection result data;
the processing module is used for calibrating the pelvic floor muscle pressure real-time detection data according to the pressure calibration parameters, and specifically comprises the following steps:
calculating pelvic floor muscle pressure detection result data at each moment after calibration according to the formula 2;
p ti'=Pti+ΔPi type 2
Wherein, P ti is the real-time detection data of pelvic floor muscle pressure at the i-th moment in the detection process, deltaP i is the pressure calibration parameter at the i-th moment in the detection process, and P ti' is the detection result data of pelvic floor muscle pressure at the i-th moment after calibration;
the detection device further includes: the air cylinder, the air valve and the air pump;
the cylinder is arranged on the pipeline and communicated with the pipeline to form a part of the cavity;
The air valve and the air pump are respectively arranged on the pipeline;
The gas valve is used for controlling the release of gas in the cavity;
The air pump is used for inflating the cavity.
2.A method of calibrating pelvic floor muscle pressure based on the pelvic floor muscle pressure detection apparatus of claim 1, the method comprising:
Acquiring real-time detection data of pelvic floor muscle pressure in a detection process, a first reference pressure of a chamber before the detection process and a second reference pressure of a chamber after the detection process, and determining whether to calibrate the real-time detection data of pelvic floor muscle pressure according to the real-time detection data of pelvic floor muscle pressure, the first reference pressure and the second reference pressure;
When the real-time detection data of the pelvic floor muscle pressure is determined not to be calibrated, the processing module takes the real-time detection data of the pelvic floor muscle pressure as the detection result data of the pelvic floor muscle pressure;
when the calibration processing is determined, the calibration module generates pressure calibration parameters corresponding to each moment in the detection process according to the first reference pressure, the second reference pressure and the time parameters of the detection process;
The calibration module generates a pressure calibration parameter corresponding to each moment in the detection process according to the first reference pressure, the second reference pressure and the time parameter of the detection process, and specifically includes:
calculating pressure calibration parameters at each moment in the detection process according to formula 1;
ΔP i=(P1-P2)*ti/T type 1
Wherein T is total detection duration data from a start time to an end time of the detection process, P 1 is a first reference pressure of the chamber at the start time of the detection process, P 2 is a second reference pressure of the chamber at the end time of the detection process, T i is detection duration data from the start time to the i-th time of the detection process, and Δp i is a pressure calibration parameter corresponding to the i-th time of the detection process;
performing calibration processing on the pelvic floor muscle pressure real-time detection data according to the pressure calibration parameters to obtain calibrated pelvic floor muscle pressure detection result data;
The calibrating processing is carried out on the pelvic floor muscle pressure real-time detection data according to the pressure calibrating parameters, and the obtained calibrated pelvic floor muscle pressure detection result data specifically comprises the following steps:
calculating pelvic floor muscle pressure detection result data at each moment after calibration according to the formula 2;
p ti'=Pti+ΔPi type 2
Wherein, P ti is the real-time detection data of pelvic floor muscle pressure at the i-th moment in the detection process, deltaP i is the pressure calibration parameter at the i-th moment in the detection process, and P ti' is the detection result data of pelvic floor muscle pressure at the i-th moment after calibration.
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| CN108474715A (en) * | 2015-12-21 | 2018-08-31 | 英福康有限责任公司 | Total leakage measuring instrumentation of incompressible test object in film room |
| CN105962957A (en) * | 2016-05-18 | 2016-09-28 | 深圳大学 | System for evaluating female pelvic floor muscle strength |
| CN108066860A (en) * | 2016-11-16 | 2018-05-25 | 北京航天长峰股份有限公司 | A kind of lung ventilator leak compensation method |
| CN207145176U (en) * | 2017-08-28 | 2018-03-27 | 沈阳鼓风机集团申蓝机械有限公司 | A kind of multiaspect labyrinth seal piston ring |
| CN109335366A (en) * | 2018-11-23 | 2019-02-15 | 曾勇军 | A kind of oversize flexibility gas storage and method |
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