Passive anorectal manometry device

Abstract

The application provides a passive anorectal pressure measuring device, which comprises a pressure measuring device body and an inflatable balloon. The pressure measuring device body is a flexible tubular structure with a cavity, and comprises, in sequence from a proximal end to a distal direction of the pressure measuring device body, an air inlet section, a detection section and an inflation section. The inflatable balloon is connected to the wall of the flexible tubular structure of the pressure measuring device body, the inflation section extends into the inflatable balloon, and a gas hole is arranged on the inflation section, so that the inflation section is in gas communication with the inside of the inflatable balloon through the gas hole. A multi-stable cell string is arranged in the cavity of the detection section. An interface is arranged on the air inlet section for connecting to an external gas source. The pressure measuring device provided by the application does not need external connection, and the portability and ease of use of the pressure measuring device are improved.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more particularly to a passive anorectal pressure measuring device. Background Technology

[0002] Currently, anorectal manometry is used in clinical practice to assess anorectal function. Surgeons rely on anorectal manometry to understand the patient's anorectal function, enabling accurate assessment and the development of appropriate treatment plans.

[0003] Current research on anorectal manometry devices, both domestically and internationally, primarily focuses on sensor integration, lacking practical research on portable devices and failing to meet the clinical need for ease of use. A comprehensive analysis of existing technologies reveals three main problems: Insufficient portability: Existing piezoelectric sensor-based manometry devices require a power supply, significantly limiting their range of motion and hindering portability in various environments; Insufficient ease of use: Existing manometry devices typically require bulky data acquisition hardware to collect and decode the measured electric field, necessitating complex calculations and processing using specialized computer software, making it impossible to obtain measurement data intuitively; Poor accuracy: Existing balloon-based methods measure anal canal pressure over a segment rather than a single point. Due to the compressibility of air, the transmitted pressure wave is weakened, resulting in a lower response frequency, leading to poor accuracy and sensitivity, and susceptibility to human influence and significant variations.

[0004] Therefore, designing a portable and easy-to-use anorectal manometry device that allows surgeons to immediately assess patients' anorectal function in outpatient settings is crucial for the diagnosis and treatment of related diseases and for the development of the discipline. Summary of the Invention

[0005] The present invention aims to at least solve one of the technical problems existing in related technologies. To this end, the present invention provides a passive anorectal manometry device.

[0006] This invention provides a passive anorectal manometry device, comprising:

[0007] The pressure measuring device body and the expandable balloon;

[0008] The pressure measuring device body is a flexible tubular structure with a cavity, including an air inlet section, a detection section, and an inflation section arranged sequentially from the proximal end to the distal end of the pressure measuring device body.

[0009] The expandable balloon is connected to the flexible tubular structure wall of the pressure measuring device body. The inflation section extends into the expandable balloon and is provided with an air hole. The inflation section communicates with the gas inside the expandable balloon through the air hole.

[0010] The detection section contains a multistable cell string;

[0011] The air intake section is equipped with an interface for connecting to an external air source.

[0012] According to the present invention, a passive anorectal pressure measuring device is provided in which, when the inflation section extends into the first test area, gas is supplied to the air intake section by an external gas source. After the gas enters the air intake section, it enters through the air hole of the inflation section and fills the expandable balloon to form an expansion structure. The expansion structure is used to abut against the boundary structure of the first test area to detect the pressure change of the first test area.

[0013] According to the present invention, a passive anorectal manometry device is provided in which, when the expandable balloon forms an expansion structure, the air inlet section is closed to form a closed structure between the manometry device body and the expandable balloon. When the expansion structure abuts against the boundary structure of the first test area, the pressure change in the first test area causes a change in the gas pressure inside the expansion structure. The gas pressure change inside the expansion structure is transmitted to the multistable cell string in the detection section.

[0014] According to the present invention, a passive anorectal manometry device is provided, wherein the multistable cell string includes multiple series-connected multistable cells, and the multiple series-connected multistable cells generate multi-level deformation in response to gas pressure changes in the first test area.

[0015] According to the present invention, a passive anorectal manometry device is provided, wherein the multistable cell is a curved beam structure, and the curved beam structure deforms when subjected to pressure.

[0016] According to the present invention, a passive anorectal manometry device comprises a multistable cell array connected in series within the detection segment cavity. Each multistable cell serves as a first multistable cell. Around each first multistable cell, multiple second multistable cells are connected in parallel with the first multistable cell and radiate outwards from the first multistable cell. When the detection segment is placed within a second test area (e.g., the anal canal), the test subject performs actions such as contracting the anus, simulating defecation, coughing, or rapidly injecting air or water into the rectum to induce anorectal inhibition reflexes. At this time, the flexible tubular structure wall at the detection segment deforms in response to pressure changes in the anal sphincter, generating a compressive force on the air within the detection segment cavity from the circumferential direction. The second multistable cells deform in response to this compressive force.

[0017] According to the present invention, a passive anorectal manometry device is provided in which the line connecting the midpoints of the curved beams of a plurality of first multistable cells is collinear with the axis of the manometry device body.

[0018] According to the present invention, a passive anorectal manometry device is provided in which the curved beams of a plurality of second multistable cells connected in parallel are configured to withstand the circumferential pressure changes of the detection section cavity.

[0019] A passive anorectal manometry device according to the present invention further includes:

[0020] Multiple pressure sensors;

[0021] Multiple pressure sensors are distributed on the curved beam of the multistable cell.

[0022] A passive anorectal manometry device according to the present invention further includes:

[0023] Operating handle;

[0024] The operating handle is fitted onto the air intake section.

[0025] The passive anorectal manometry device of the present invention uses the deformation of a multistable cell string in the longitudinal direction of the device body to reflect the pressure changes in the rectal lumen, avoiding the pressure attenuation caused by air compression, and thus achieving high accuracy and sensitivity. The multistable cell string responds to pressure through its own deformation, requiring no external power supply, making it a passive device.

[0026] In the circumferential direction of the detection segment, pressure changes from the anal sphincter on a single plane can be measured using parallel multistable cells arranged circumferentially. Changes in the curved beams of the multistable cells reflect pressure changes in various directions along the circumferential direction. Furthermore, the different shapes of the curved beams of each parallel multistable cell in the circumferential direction reflect the asymmetry of anal sphincter pressure, thus enabling the detection of asymmetric pressure changes in the anal sphincter. Parallel multistable cells arranged longitudinally can detect pressure changes in the internal and external anal sphincter muscles. Combining circumferential and longitudinal parallel multistable cell strings allows for a comprehensive assessment of anal sphincter function. This overcomes the limitation of existing rectal manometry devices that cannot measure single-point pressure when measuring anal canal pressure.

[0027] The pressure measuring device provided by this invention does not require external hardware for data acquisition and decoding. It uses mechanical principles and its own deformation response to quickly read and calculate various key indicators after pressure measurement based on calibration or conversion, thus completing the measurement and forming a passive pressure measuring structure, which improves the portability and ease of use of the pressure measuring device.

[0028] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of a passive anorectal pressure measuring device provided in an embodiment of the present invention;

[0031] Figure 2 This is a forward schematic diagram of the uncompressed state of a multistable cell string in a passive anorectal manometry device provided in an embodiment of the present invention;

[0032] Figure 3 This is a top-down schematic diagram of the uncompressed state of a multistable cell string in a passive anorectal manometry device provided in an embodiment of the present invention.

[0033] Figure 4 This is a schematic diagram of a passive anorectal pressure measuring device in working condition according to an embodiment of the present invention.

[0034] Figure label:

[0035] 100. Pressure measuring device body; 110. Air inlet section; 120. Detection section; 130. Inflation section; 140. Air vent; 200. Expandable balloon; 300. Multistable cell string; 310. First multistable cell; 320. Second multistable cell. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, embodiments of this invention, and should not be construed as limiting the invention. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention. In the description of this invention, it should be understood that the terminology used is for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In this specification, when "far side" or "distal end" is mentioned, it refers to the side closer to the object under test or the area to be tested, that is, the side away from the air intake section of the pressure measuring device body. In this specification, when "proximal side" or "proximal end" is mentioned, it refers to the side considering the air intake section of the pressure measuring device body, that is, the side away from the object under test or the area to be tested.

[0038] The following is combined Figures 1 to 4Description of embodiments of the present invention.

[0039] like Figure 1 As shown, the present invention provides a passive anorectal manometry device, comprising:

[0040] Pressure measuring device body 100 and expandable balloon 200;

[0041] The pressure measuring device body 100 is a flexible tubular structure with a cavity, including an air inlet section 110, a detection section 120, and an inflation section 130 arranged sequentially from the proximal end to the distal end of the pressure measuring device body 100.

[0042] The expandable balloon 200 is connected to the flexible tubular structure wall of the pressure measuring device body 100. The inflation section 130 extends into the expandable balloon 200 and is provided with an air hole 140 on the inflation section. The inflation section 130 communicates with the gas inside the expandable balloon 200 through the air hole 140.

[0043] The cavity of the detection section 120 is provided with a multistable cell string 300;

[0044] The air intake section 110 is provided with an interface for connecting to an external air source.

[0045] like Figure 4 As shown, the inflation section of the pressure measuring device body is provided with air holes. The inflation section and the expandable balloon of the pressure measuring device body are used to extend into the rectal cavity of the subject to be tested. The detection section is arranged in the anal canal area of ​​the subject to be tested, and the air intake section is usually arranged outside the subject to be tested.

[0046] like Figure 4 As shown, in the working state, when the expandable balloon inflates to form an expanded structure and presses against the boundary structure within the rectal lumen (i.e., the rectal wall), in response to changes in the gas pressure inside the expanded structure, as can be seen from the magnified right-hand small image of the detection segment, the multistable cell string 300 undergoes overall deformation, changing from the pre-deformation morphology on the left to the post-deformation morphology on the right. Figure 4 As can be seen, the multistable cell string 300 is located in the detection section of the pressure measuring device body 100, that is, at the position corresponding to the anal canal area of ​​the subject being tested. When testing anal function, the subject needs to be instructed to hold their breath or perform specific anal sphincter movements to measure the pressure changes within the anal canal in order to detect various indicators reflecting anal function.

[0047] In one specific implementation, the length of the pressure measuring device body is 30-120cm, wherein the length of the detection segment is greater than the length of the anal canal of the subject being tested. Since the length of the anal canal of a normal adult is 2.5-4cm, the length of the detection segment can be at least greater than 4cm. In another specific implementation, the length of the detection segment can be less than the length of the anal canal of the subject being tested.

[0048] In one embodiment, the gas supplied by the external gas source may be air or carbon dioxide.

[0049] When the inflation section extends into the first test area, gas is supplied to the air intake section from an external gas source. After entering the air intake section, the gas enters through the air holes of the inflation section and fills the expandable balloon 200 to form an expansion structure. The expansion structure abuts against the boundary structure of the first test area to detect the pressure change of the first test area.

[0050] In one specific implementation, the first area to be tested is the rectal cavity.

[0051] When the expandable balloon 200 forms an expansion structure, the air inlet section 110 is closed, causing the pressure measuring device body 100 and the expandable balloon 200 to form a closed structure. When the expansion structure abuts against the boundary structure of the first test area, the pressure change in the first test area causes a change in the gas pressure inside the expansion structure. The gas pressure change inside the expansion structure is transmitted to the multistable cell string 300 in the detection section 120, thereby causing deformation of the multistable cell string.

[0052] Furthermore, a valve may be provided on the air intake section 110. When the expandable balloon 200 expands to form an expansion structure, such as a sphere, the operator can close the valve. In another embodiment, a flange may be provided on the air intake section to connect to a pipeline of an external air source, and the gas supply can be cut off or opened using a valve or other flow control device on the external air source pipeline.

[0053] In one embodiment, the expandable balloon can be made of medical-grade silicone, which has good elasticity and biocompatibility. During pressure measurement, the elastic expansion structure made of silicone can first conform to the rectal wall structure, and it also has good deformation performance to meet different measurement needs when there are pressure changes in the rectum.

[0054] The multistable cell string 300 includes multiple multistable cells connected in series, and the multiple multistable cells in series generate multi-level deformation in response to changes in gas pressure in the first test area.

[0055] Furthermore, curved beams exhibit more complex characteristics under stress, including the coupling of axial deformation and in-plane bending, the coupling of vertical deflection and torsion, and the coupling with cross-sectional distortion. Among these, the most important is the coupling of deflection and torsional deformation, meaning that curved beams will simultaneously generate bending moment and torsion under vertical loads and torques, and these moments will influence each other.

[0056] When a curved beam structure is subjected to external pressure, its geometry can produce large deformations or displacements. These deformations or displacements can be directly captured by pressure sensors and converted into electrical signals or other forms of processable data. In other words, when a curved beam is subjected to pressure, due to the "bending-torsion" coupling effect, its cross-sectional tensile stress is greater, thereby increasing its sensitivity to pressure changes.

[0057] Each multistable cell in the multistable cell string 300 connected in series within the detection section cavity serves as a first multistable cell 310. Around each first multistable cell 310, multiple second multistable cells 320 are connected in parallel with the first multistable cell 310 and radiate outward from the first multistable cell 310 as the center.

[0058] In one implementation, the multiple multistable cells connected in parallel have a "petal-like" structure. The multistable cell string arranged longitudinally in the cavity serves as the central multistable cell string. Each multistable cell in the central multistable cell string, namely the first multistable cell 310, serves as the central multistable cell. Along the circumference of the detection section cavity, on the plane of each central multistable cell, the multistable cells connected in parallel, namely the second multistable cells 320, radiate outward from the central multistable cell.

[0059] Furthermore, such as Figure 2 and Figure 3 As shown, the multiple multistable cells arranged along the length of the pressure measuring device body, that is, the multiple first multistable cells 310, are all arranged in series, and the curved beam structure of the multistable cell series 300 is upward. The curved beam structure of each multistable cell in the lower position is connected to the bottom of the adjacent multistable cell through a connecting shaft.

[0060] Furthermore, on the periphery of each first multistable cell, multiple second multistable cells located on the same plane are connected in parallel, and the curved beam structure of each second multistable cell is connected to the periphery of the corresponding first multistable cell through a connecting shaft.

[0061] Figures 2 to 3 The diagram shown is a schematic representation of the structure of the multistable cell string 300 in the uncompressed state, which is the fully expanded form of the multistable cell string. Figure 2 This is a front view of the uncompressed state of a multistable cell string. Figure 3This is a top view of the uncompressed state of a multistable cell string.

[0062] Depend on Figure 2 It is known that the multistable cell string 300 has multiple first multistable cells connected in series along the axial direction, and multiple second multistable cells are evenly arranged circumferentially around each of the first multistable cells along the axial direction. The second multistable cells are perpendicular to the axis of the first multistable cells. This structural arrangement allows the multistable cell string to sensitively produce shape changes regardless of which direction it is compressed. Moreover, the shape changes of the multistable cell string may be in the following modes: fully unfolded mode (no compression), fully deformed mode (omnidirectional compression), axially deformed mode (axially compressed only), circumferentially deformed mode (circumferentially compressed in all directions only), and partially deformed mode (circumferentially compressed in some directions only). This allows for the measurement of multiple regions (i.e., the first and second test regions). Figure 4 The embodiments shown are used to comprehensively sense the pressure change areas (rectal cavity and anal canal region).

[0063] The line connecting the midpoints of the curved beams of the multiple first multistable cells 310 is collinear with the axis of the pressure measuring device body 100.

[0064] The direction of the curved beam of the parallel second multistable cell 320 is set to withstand the circumferential pressure change of the detection section cavity, so that the parallel second multistable cell 320 can detect the pressure change of the second test area where the detection section is located.

[0065] In one embodiment, the second test area may be the anal canal. Preferably, the length of the detection segment can be greater than the length of the anal canal, so that pressure changes generated by the contraction of the internal and external anal sphincter can be detected simultaneously through multiple parallel second multistable cells in the longitudinal direction. Of course, in another embodiment, the length of the detection segment can be less than the length of the anal canal, so that by changing the placement of the detection segment, only the pressure changes of the internal anal sphincter or only the external anal sphincter can be detected.

[0066] In one implementation, the curved beam of the first multistable cell is positioned facing the longitudinal axis of the cavity to withstand longitudinal pressure changes. In rectal manometry, the deformation of the curved beam of the first multistable cell reflects the pressure changes within the rectal cavity.

[0067] In one implementation, the curved beams of the parallel second multistable cells are arranged circumferentially facing the cavity to withstand pressure variations from the circumferential direction. For example... Figure 4As shown, in rectal manometry, the testing segment is placed inside the anal canal of the subject; therefore, the bending deformation of the parallel multistable cells can reflect pressure changes in the anal sphincter. When performing anal sphincter pressure testing, physicians assess several key indicators, including maximal voluntary contraction pressure, defecation pressure, resting pressure, sphincter pressure changes during coughing, rectoanal inhibitory reflex (RAIR), and rectal volume sensory threshold.

[0068] In one specific implementation, the parallel multistable cells can be 4, 6, 8, or 10 multistable cells connected in parallel with the central multistable cell, preferably 8.

[0069] In this invention, the multistable cell string adopts a "petal-like" structure, namely a combination of a first multistable cell ("stamen") and parallel second multistable cells ("petals"). Multiple first multistable cells are connected in series, and the deformation of these cells reflects pressure changes within the rectal lumen. The curved beam of each parallel second multistable cell faces the circumferential direction of the lumen. Therefore, each petal of the "petal-like" structure is on the same plane, as shown below. Figure 3 In the middle section, one first multistable cell and eight parallel second multistable cells can reflect pressure changes in various directions along the circumference of the detection section cavity. Longitudinally, multiple second multistable cells on the central axis of the pressure measuring device body cavity can reflect pressure changes in the internal and external anal sphincter muscles along the length of the anal canal, as shown in [reference needed]. Figure 4 .

[0070] The passive anorectal manometry device of the present invention utilizes a multistable cell string configuration with a "petal-like" structure. The curved beam, which is a second multistable cell connected in parallel as a "petal", can also measure the asymmetric changes in anal sphincter pressure. This pressure deviation phenomenon helps anal control and can also serve as a reliable indicator for evaluating the efficacy of biofeedback training.

[0071] Furthermore, the series design can increase the system's response amplitude. Since the deformation or displacement of the cell series can be superimposed, the entire device responds more significantly to pressure changes, thereby improving the sensitivity and accuracy of the measurement.

[0072] In one embodiment, the passive anorectal manometry device 100 further includes:

[0073] Multiple pressure sensors;

[0074] Multiple pressure sensors are distributed on the curved beam of the multistable cell.

[0075] In one implementation, when the multistable cell is a curved beam structure, a pressure sensor can be installed on the curved beam of the multistable cell. The curved beam deforms in response to pressure changes, and the pressure sensor installed on the curved beam can detect the pressure changes experienced by the curved beam.

[0076] Furthermore, when cells in a multistable cell string are subjected to external pressure, they can deform according to changes in external pressure. This deformation includes not only microscopic changes in the relative positions between cells, but also macroscopic changes in the shape of the entire cell string. In pressure measurement of the anus and rectum, the multistable cell string, as a sensitive element, converts pressure changes in the area to be measured into measurable deformation.

[0077] Furthermore, a pressure sensor is a device used to detect the deformation field data of a multistable cell string. It can capture the deformation information of the multistable cell string under pressure and convert it into electrical signals or other forms of processable data. When the multistable cell string deforms, the physical quantities inside the pressure sensor, such as resistance, capacitance, and inductance, will change accordingly, thereby generating a measurable signal. This signal is then wirelessly transmitted to an external computing device for subsequent pressure calculation and analysis.

[0078] In one implementation, an external computing device (e.g., an industrial computer, a microcontroller, or a personal general-purpose computer) can be used to receive the deformation field data output by the pressure sensor and calculate the pressure field data of multiple test areas (e.g., the rectal cavity and anal canal) according to a preset mapping relationship. The results can then be displayed to the user in a visual or other form.

[0079] In one embodiment, the passive anorectal manometry device 100 further includes:

[0080] Operating handle;

[0081] The operating handle is fitted onto the air intake section of the pressure measuring device body.

[0082] Furthermore, the operating handle can be used by the operator to hold the pressure measuring device 100 and operate the pressure measuring device 100 to control air intake, air exhaust, and shut-off.

[0083] This invention provides a passive anorectal manometry device. This passive manometry structure utilizes the self-deformation response of a multistable cell string. Through suggested calibration or conversion, it quickly reads and calculates various key indicators after manometry measurement. This allows for pressure measurement without the need for an external power supply or equipment, offering high portability and ease of use. It enables physicians to quickly grasp the relevant information about the patient's anorectal function, accurately assess the patient's anorectal function, and formulate reasonable treatment plans, thus improving convenience, economy, and timeliness.

[0084] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0085] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A passive anorectal manometry device, characterized in that, include: The pressure measuring device body and the expandable balloon; The pressure measuring device body is a flexible tubular structure with a cavity, including an air inlet section, a detection section and an inflation section arranged sequentially from the proximal end to the distal end of the pressure measuring device body; The expandable balloon is connected to the flexible tubular structure wall of the pressure measuring device body. The inflation section extends into the expandable balloon and is provided with an air hole. The inflation section communicates with the gas inside the expandable balloon through the air hole. The detection section contains a multistable cell string; When the inflation section extends into the first test area, gas is supplied to the air intake section from an external gas source. After the gas enters the air intake section, it enters through the air hole of the inflation section and fills the expandable balloon to form an expansion structure. The expansion structure is used to resist the boundary structure of the first test area to detect the pressure change of the first test area. When the expandable balloon forms an expansion structure, the air intake section is closed, causing the pressure measuring device body and the expandable balloon to form a closed structure. When the expansion structure abuts against the boundary structure of the first test area, the pressure change in the first test area causes the gas pressure inside the expansion structure to change. The gas pressure change inside the expansion structure is transmitted to the multistable cell string in the detection section. The multistable cell string includes multiple multistable cells connected in series, and the multiple multistable cells in series generate multi-level deformation in response to changes in gas pressure in the first test area; the multistable cell is a curved beam structure, wherein the curved beam structure deforms when subjected to pressure; The air intake section is equipped with an interface for connecting to an external air source.

2. The passive anorectal manometry device according to claim 1, characterized in that, Each multistable cell in the multistable cell string arranged in the detection section cavity is a first multistable cell. Around each first multistable cell, a plurality of second multistable cells are connected in parallel with the first multistable cell and radiate outward from the first multistable cell.

3. The passive anorectal manometry device according to claim 2, characterized in that, The line connecting the midpoints of the curved beams of the multiple first multi-stable cells is collinear with the axis of the pressure measuring device body.

4. The passive anorectal manometry device according to claim 2, characterized in that, The direction of the curved beam of the parallel second multistable cell is set to withstand the circumferential pressure change of the detection section cavity, so that the parallel second multistable cell can detect the pressure change of the second test area where the detection section is located.

5. A passive anorectal manometry device according to claim 1, characterized in that, Also includes: Operating handle; The operating handle is fitted onto the air intake section.

Images