Flexible wall surface closed chamber fluid pressure detection method and system
By applying generalized force and measuring the total volume of the work done by measuring the chamber and calculating its internal fluid pressure, the problem of non-invasive monitoring of flexible wall sealed containers and abdominal pressure in the prior art is solved, and non-invasive, convenient and accurate detection is achieved, avoiding Pain and risk of infection in traditional methods.
Patent Information
- Application Number
- CN202411222777.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2024-12-27
AI Technical Summary
The prior art is difficult to monitor the internal fluid pressure and abdominal pressure of flexible wall sealed containers non-invasively, conveniently and accurately, and traditional methods cause pain and infection risk to patients.
By applying a generalized force to displace the sealed chamber, the total work volume of the chamber is measured, thereby calculating the average pressure of its internal fluid to achieve non-destructive detection. The method includes a work-making device, a dynamometer, a volume measurement device and a calculation module, which can measure the deformation volume of the chamber without contact and calculate the fluid pressure.
It realizes non-invasive, convenient and accurate fluid pressure monitoring of flexible wall sealed containers and abdominal cavity, avoids the pain and infection risks brought to patients by traditional methods, and provides a more flexible and accurate detection method.
Smart Images
Figure CN119197861A_ABST
Abstract
Description
Technical Field
[0001] The invention discloses a method and system for detecting fluid pressure in a closed chamber with a flexible wall, and relates to the field of chamber pressure detection. Background Art
[0002] At present, the pressure of the fluid inside the flexible wall sealed container is mainly measured by contacting the fluid pressure sensor to measure the fluid pressure. Therefore, a pipe joint needs to be set on the container wall to introduce the fluid to be measured into the fluid pressure sensor, and then a hole needs to be opened on the container wall. However, there are some occasions where it is inconvenient or impossible to open a hole on the wall, such as when the flexible wall sealed container contains dangerous fluids, when the design requires that the pressure sensor cannot be connected through a pipe joint, or when the container wall does not allow additional holes.
[0003] In addition, the abdominal cavity is a closed and flexible chamber in the human body, and its internal pressure, namely the intra-abdominal pressure, often needs to be measured and monitored at any time in medical practice. For example, patients with diseases such as abdominal effusion often need to monitor their intra-abdominal pressure to prevent damage to internal organs. The commonly used method for measuring intra-abdominal pressure is the bladder measurement method, but its operation requires the insertion of a catheter, which is traumatic to the patient and poses a risk of infecting the patient's urinary tract; it is impossible to dynamically obtain the intra-abdominal pressure value; there are large errors; and it is inconvenient to operate. In addition, there are other methods for measuring intra-abdominal pressure, such as transgastric manometry and puncture manometry, but their operation is less flexible and causes greater pain to patients.
[0004] At present, there is an urgent clinical need for a new intra-abdominal pressure detection method, and its common technology has a wide range of uses. Driven by this, the inventor has carried out in-depth research and development work. The technology described in this patent can monitor the intra-abdominal pressure of patients non-invasively, at any time, conveniently, accurately, and without damaging privacy, which can eliminate the pain caused to patients by existing detection methods and facilitate doctors and even patients themselves to perform intra-abdominal pressure measurement operations. Summary of the invention
[0005] The purpose of the present invention is to provide a method and system for non-destructive detection of fluid pressure in a flexible-walled sealed chamber and a method and system for non-invasive detection of intra-abdominal pressure, so as to achieve non-destructive and quick detection of fluid pressure inside a flexible-walled sealed container and non-invasive, convenient, accurate and privacy-free monitoring of a patient's intra-abdominal pressure.
[0006] The present invention achieves the above object through the following technical solutions: 1. A method for detecting fluid pressure in a closed chamber with a flexible wall, comprising: Applying a generalized force F (force or fluid pressure) to the sealed chamber causes the sealed chamber to generate a generalized displacement S (displacement or fluid volume change), thereby doing work dW=F*S on the sealed chamber 3; measuring the total volume dV of the closed chamber where work is done; The average pressure of the fluid in the closed chamber in the area including the inner wall of the area where work is done is p=dW / dV.
[0007] 2. Further, the average pressure of the fluid in the closed chamber in the area including the inner wall of the work-doing area is p=dW / dV=(dE-ΔEi) / dV, Among them, ΔEi is the sum of some items among dEe, dEg, dEk, and dQ, dE is the total energy input into the closed chamber by the work-doing device, dEe is the change in elastic potential energy of the closed chamber, dEg is the change in gravitational potential energy of the closed chamber, dEk is the change in kinetic energy of the closed chamber, and dQ is the change in thermal energy of the closed chamber.
[0008] 3. Furthermore, the total volume dV of the work done on the closed chamber is equal to the volume of the closed chamber that invades its adjacent space when work is done on the closed chamber.
[0009] 4. Non-invasive methods for measuring intra-abdominal pressure, including: Open the airway; Work done on the abdominal cavity dW; The volume dV3 of gas expelled from the lungs is detected as the total volume dV of work done on the abdominal cavity; The average pressure of the fluid in the abdominal cavity in the area including the inner wall of the worked area is dW / dV.
[0010] 5. Flexible wall closed chamber fluid pressure detection system, including: a work-doing device for doing work on the closed chamber, providing a generalized force dF (force or fluid pressure) and a generalized displacement dS (displacement or change in fluid volume); a dynamometer for measuring the work dW done on the closed chamber; a volume measuring device for measuring the total volume dV of work done on the closed chamber; The calculation module is used to calculate and display the fluid pressure p according to the algorithm p=dW / dV =dF*dS / dV.
[0011] 6. Furthermore, the flexible wall-enclosed chamber of the method or system described in 1-3 and 5 may also be a chamber such as the abdominal cavity of an animal or human body, and the flexible wall may also be a wall such as the abdominal wall of an animal or human body.
[0012] 7. Furthermore, the method or system described in 1-5 may also include: The wall fixing step or device is used to fix the peripheral position of the flexible wall or the abdominal wall where work is done.
[0013] 8. Furthermore, the total volume dV of the method or system of 1-5 is equal to the total volume dV0 of deformation of the flexible wall or abdominal wall in the area where work is done, and the total volume dV can be measured by a method or device that measures the volume of the fluid filling the total volume dV0 of deformation, or by a non-contact measurement method or device.
[0014] 9. Furthermore, the method or system described in item 7 can fix the flexible wall surface by using some of the methods or devices selected from adsorption, clamping and bonding.
[0015] 10. Furthermore, the wall fixing step or device of the method or system described in 7 (such as Figure 2 As shown in the figure, only the fluid in the space area (denoted as Z) enclosed by the flexible wall or abdominal wall before deformation (T1) and after deformation (T2) of the work area is allowed to enter and exit the space area Z from the openings and pipes on the surface (denoted as S) of the wall fixing device that closes the space area Z, and the surface S cannot produce deformation that affects the volume measurement of the space area Z, so as to ensure the accurate measurement of the volume of the space area Z. The volume of the fluid entering and exiting the space area Z, that is, the volume of the fluid filling the total deformation volume dV0, can be measured by a fluid volume measuring device, and then the total volume of the work done dV=dV0 is obtained.
[0016] The space area enclosed by the surface S and the position after deformation (T2) includes the space area Z enclosed by the position before deformation (T1) and the position after deformation (T2), because before the work starts, there is inevitably a certain gap space M between the surface S and the position before deformation (T1). BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 Schematic diagram of the overall implementation of the present invention Figure 2 Schematic diagram of wall fixation, work done and volume measurement of the present invention DETAILED DESCRIPTION
[0018] The present invention will be further described below by describing a preferred specific embodiment in detail in conjunction with the accompanying drawings. Example
[0019] like Figure 1 The figure shows a preferred specific embodiment of the method for detecting fluid pressure in a closed chamber with a flexible wall according to the present invention - the method for detecting fluid pressure in a closed chamber with a flexible wall, namely, Embodiment 1.
[0020] The sealed chamber 3 is placed on the support 1, and a generalized force F (force or fluid pressure) is applied to the sealed chamber 3 through the work-doing area 3-1 by the work-doing device 13, and work dW is done on the sealed chamber 3, so that the sealed chamber 3 is deformed. The generalized displacement of the generalized force F is S (displacement or fluid volume change), so that the work-doing area 3-1 of the sealed chamber 3 is deformed from the T1 position to the T2 position. The volume of the sealed chamber 3 deformed at the work-doing area 3-1 is dV0, which is equal to the total volume dV of the work done on the sealed chamber 3. Then the average pressure p of the fluid in the sealed chamber 3 including the inner wall of the work-doing area 3-1 is dW / dV = dW / dV0.
[0021] Specifically, if dE is the total energy input to the closed chamber 3 by the work device 13, dEe is the change of elastic potential energy of the closed chamber 3, dEg is the change of gravitational potential energy of the closed chamber 3, dEk is the change of kinetic energy of the closed chamber 3, and dQ is the change of thermal energy of the closed chamber 3. ΔEi is the sum of some or all of dEe, dEg, dEk, and dQ. Then the fluid pressure p in the closed chamber 3 = dW / dV = (dE-ΔEi) / dV.
[0022] like Figure 1 As shown, the total volume dV of the work done on the closed chamber 3 in the method for detecting the fluid pressure of a closed chamber with a flexible wall is equal to the total deformation volume dV0 of the area 3-1 being worked, and further equal to the volume dV2 of the movable wall 3-2 of the closed chamber 3 invading its adjacent space 8 when work is done. Since the deformation of the wall 7 of the adjacent space 8 is very small, the dV2 is equal to the volume dV3 of the fluid discharged from the adjacent space 8 through the pipe 10 into the detection device 9 due to the compression. Therefore, the fluid pressure p of the closed chamber 3 is dW / dV=dW / dV0=dW / dV2=dW / dV3. The total deformation volume dV0 can be obtained by measuring the volume of the fluid filling the total deformation volume dV0, or by a contactless measurement method or device.
[0023] like Figure 2 As shown, when measuring the dV0 by measuring the volume of the fluid filling the total deformation volume dV0, it is necessary to fix the peripheral position 4 of the worked area 3-1 of the flexible wall or abdominal wall by some method 5 including adsorption, clamping and bonding.
[0024] The wall fixing method (such as Figure 2 As shown in FIG. 1 ), only the fluid in the space area (denoted as Z) enclosed by the position before deformation (T1) and the position after deformation (T2) of the flexible wall or abdominal wall by the work area 3-1 is allowed to pass through the wall fixing device (as shown in FIG. Figure 2The opening 16 and the pipe 17 on the surface (denoted as S) that closes the space region Z enter and exit the space region Z, and the surface S cannot produce deformation that affects the volume measurement of the space region Z, so as to ensure the accurate measurement of the volume of the space region Z. The volume of the fluid entering and exiting the space region Z, that is, the volume of the fluid filling the total deformed volume dV0, can be measured by the fluid volume measuring device 15, and then the total volume of work dV=dV0 is obtained.
[0025] like Figure 1 or Figure 2 As shown, when the dV0 is measured by non-contact measurement, a non-contact measuring instrument 6 such as an optical camera device is required to be aimed at the worked area 3-1, and a measurement algorithm is used to calculate the total deformation volume dV0, that is, dV=dV0.
[0026] If Figure 1 The flexible wall sealed chamber 3 shown is a chamber such as the abdominal cavity of an animal or a human body, and the flexible wall is the wall such as the abdominal wall of an animal or a human body. Figure 1 Some structures in the embodiment are structures of animals or human bodies. Therefore, there may be a second embodiment and a third embodiment. Example
[0027] like Figure 1 Another preferred specific embodiment of the method for detecting fluid pressure in a closed chamber with a flexible wall according to the present invention is shown, namely, a non-invasive method for detecting intra-abdominal pressure, namely, embodiment 2. The specific steps include: Open the airway 10; Work dW is performed on the abdominal cavity 3 through the worked area 3-1 of the abdominal wall; Detecting the volume dV3 of gas exhausted from the lungs 8; The average pressure of the fluid in the abdominal cavity 3 including the inner wall of the worked area 3 - 1 is p=dW / dV=dW / dV3. Example
[0028] like Figure 1 The figure shows another preferred specific embodiment of the method for detecting fluid pressure in a closed chamber with a flexible wall according to the present invention, namely, the second non-invasive detection method for intra-abdominal pressure, i.e., the third embodiment, and the specific steps include: Work dW is done on the abdominal wall area 3-1; measuring the total volume dV of work done on the abdominal wall region 3 - 1; The average pressure of the fluid in the abdominal cavity 3 including the inner wall of the worked area 3 - 1 is p=dW / dV.
[0029] The total volume of work dV is equal to the total volume of deformation dV0 of the flexible wall or abdominal wall in the worked area 3-1, and the total volume of work dV can be measured by measuring the volume of the fluid filling the total volume of deformation dV0 by means of a device 15, or by measuring the total volume of deformation dV0 by means of a non-contact measurement method or device 6. The specific operation steps are the same as the method for measuring the total volume of deformation dV0 in the first specific embodiment. Example
[0030] like Figure 1 and Figure 2 As shown, the above method can be used in a fourth preferred specific embodiment - a flexible wall closed chamber fluid pressure detection system or an intra-abdominal pressure detection system, that is, the implementation of specific embodiment 4, including: A work device 13, used for doing work on the chamber 3, providing a generalized force dF and a generalized displacement dS; a dynamometer 14 for measuring the work dW done on the chamber 3; Wall fixings (such as Figure 2 As shown), to ensure accurate measurement of the volume of the spatial region Z; a volume measuring device (15 or 6) for measuring the total volume dV of the chamber 3 where work has been done; The calculation module 11 is used to calculate and display the fluid pressure p of the chamber 3 according to the algorithm p=dW / dV=dF*dS / dV.
[0031] When measuring the dV0 by measuring the volume of the fluid filling the total deformed volume dV0, it is necessary to use some kind of adsorption, clamping, bonding device 5 to fix the peripheral position 4 of the worked area 3-1 of the flexible wall or abdominal wall.
[0032] The wall fixing device (such as Figure 2 As shown) only allows the fluid in the space area (denoted as Z) enclosed by the position T1 before deformation and the position T2 after deformation of the flexible wall or abdominal wall by the work area 3-1 to pass through the wall fixing device (as shown) Figure 2 The opening 16 and the pipe 17 on the surface (denoted as S) of the closed space region Z enter and exit the space region Z, and the surface S cannot produce deformation that affects the volume measurement of the space region Z, so as to ensure the accurate measurement of the volume of the space region Z. The volume of the fluid entering and exiting the space region Z, that is, the volume of the fluid filling the total deformed volume dV0, can be measured by the fluid volume measuring device 15, and then the total volume of the work done dV=dV0 is obtained.
[0033] The volume measuring device may also be a contactless measuring instrument such as an optical camera 6, which is aimed at the worked area 3-1 and uses a measurement algorithm to calculate the volume of the area Z to obtain dV.
[0034] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.
Claims
1. A method for detecting fluid pressure in a closed chamber with a flexible wall, characterized in that: include: Doing work dW, on the closed chamber (3); Measuring the total volume dV of work done on the closed chamber (3); The average pressure p of the fluid in the closed chamber (3) in the area including the inner wall of the work-performed area (3-1) is dW / dV.
2. The method for detecting fluid pressure in a closed chamber with a flexible wall according to claim 1, characterized in that: The pressure p=dW / dV=(dE-ΔEi) / dV, Wherein, ΔEi is the sum of some of dEe, dEg, dEk, and dQ, dE is the total energy input into the closed chamber (3) by the work-doing device (13), dEe is the change in elastic potential energy of the closed chamber (3), dEg is the change in gravitational potential energy of the closed chamber (3), dEk is the change in kinetic energy of the closed chamber (3), and dQ is the change in thermal energy of the closed chamber (3).
3. The method for detecting fluid pressure in a closed chamber with a flexible wall according to claim 1, characterized in that: The total volume dV of the sealed chamber (3) that performs work is equal to the volume (dV2) of the sealed chamber (3) that intrudes into its adjacent space (8) when work is performed.
4. A non-invasive method for detecting intra-abdominal pressure, characterized in that: include: Open the airway (10); Work dW is done on the abdomen (3); Detecting the volume of gas expelled from the lungs (dV3); The average pressure of the fluid in the abdominal cavity (3) in the area including the inner wall of the area (3-1) where work is done is p=dW / dV3.
5. A flexible wall closed chamber fluid pressure detection system, characterized in that: include: A work-doing device (13) for doing work on the closed chamber (3) to provide a generalized force (dF, i.e., force or fluid pressure) and a generalized displacement (dS, i.e., displacement or fluid volume change); A dynamometer (14) for measuring the work dW done on the closed chamber (3); A volume measuring device (15 or 6) for measuring the total volume dV of work done on the closed chamber (3); A calculation module (11) is used to calculate and display the fluid pressure p according to the algorithm p=dW / dV=dF*dS / dV.
6. The method or system according to claims 1-3, 5, characterized in that: The flexible wall sealed chamber (3) may also be a chamber such as the abdominal cavity of an animal or human body.
7. The method or system according to claims 1-5, characterized in that: Also includes: The wall fixing step or device (as shown in FIG. 2 ) is used to fix the peripheral position (4) of the flexible wall or abdominal wall where work is being done (3 - 1).
8. The method or system according to claims 1-5, characterized in that: The total volume of work (dV) is equal to the total volume of deformation (dV0) of the flexible wall or abdominal wall in the worked area (3-1), and the total volume of work (dV) can be measured by measuring the volume of the fluid filling the total volume of deformation (dV0) using a method or device (15), or by using a non-contact measurement method or device (6).
9. The method or system according to claim 7, characterized in that: The method or device for fixing the flexible wall surface (as shown in FIG. 2 ) can adopt some of the methods or devices (5) of adsorption, clamping, and bonding to fix the flexible wall surface.
10. The method or system according to claim 7, characterized in that: The wall fixing step or device (as shown in FIG2 ) only allows the fluid in the space region (denoted as Z) enclosed by the position before deformation (T1) and the position after deformation (T2) of the work-doing area (3-1) to enter and exit the space region (Z) through the opening (16) and the pipe (17) on the surface (denoted as S) of the wall fixing device (as shown in FIG2 ) that closes the space region (Z), and the surface (S) cannot produce deformation that affects the volume measurement of the space region (Z), so as to ensure the accurate measurement of the volume (dV0) of the space region (Z).