CN215841098U - Pressure measuring device and urine dynamic instrument - Google Patents

Abstract

The present invention provides a pressure measuring device, comprising: a pressure measuring cavity 1 and a body fluid flow path cavity 2 which are separated by a flexible diaphragm 3; the body fluid flow path cavity 2 is communicated with a body fluid drainage pipeline 5 to be measured in pressure; the pressure measuring cavity 1 is filled with liquid and is provided with a pressure sensor 7, the pressure measuring cavity 1 is communicated with a compensation unit 4, and the compensation unit 4 adjusts the state of the flexible diaphragm 3 by changing the volume of the pressure measuring cavity 1 or the volume of the liquid in the pressure measuring cavity 1; the pressure measuring device is simple in structure and convenient to use, the pressure sensor is not in direct contact with body fluid, the risk of infection in vivo caused by body fluid pollution of the pressure sensor is reduced, the manufacturing cost is low, and the pressure measuring device is provided with the compensation unit, so that the pressure measuring result is more accurate.

Description

Pressure measuring device and urine dynamic instrument

Technical Field

The utility model belongs to the technical field of medical instruments, and particularly relates to a pressure measuring device and a urine dynamometer using the same.

Background

Blood, tissue or body fluid in a living body has a certain pressure, such as blood pressure, intracranial pressure, bladder pressure, intra-abdominal pressure, and the like. The pressure of body fluid needs to be continuously detected clinically in the diagnosis or treatment of certain diseases, and the detection methods commonly used in the prior art include direct measurement methods and indirect measurement methods, wherein the direct measurement method is to implant a pressure sensor in a body or to take the body fluid out of the body, and the pressure sensor is in direct contact with the body fluid for measurement, the measurement method has accurate result but is easy to cause infection, and the pressure sensor can only be used as a disposable consumable material, so the cost is high. The indirect measurement method is to transmit the pressure of the body fluid to the gas in the air pressure measuring cavity through the conductive membrane by arranging the conductive membrane and the air pressure measuring cavity, and then obtain the pressure of the body fluid by monitoring the pressure of the gas, but the measurement result of the indirect measurement method is not accurate enough and the measurement steps are complex.

Patent document ZL201380028705.8 discloses an extracorporeal blood treatment system comprising: the device comprises a pressure detection device, an air pump device, at least one pressure transducer and a controller; the controller controls the air pump device to reset the membrane of the pressure detection device so as to improve the accuracy of pressure detection. However, the membrane needs to be reset before the processing system is used every time, the operation steps are complex, the processing system is inconvenient to use, and pressure fluctuation in the body fluid cavity cannot be accurately and timely conducted to the transducer side cavity due to the fact that the transducer side cavity of the pressure measuring device is filled with the compressible gas, and the measuring result is not accurate enough.

Disclosure of Invention

In view of the above technical problem, the present invention provides a pressure measuring device. The pressure measuring device of the utility model adopts liquid as a pressure transmission medium, and the device can be used for adjusting the state of the flexible diaphragm once before leaving factory or before use, and is convenient to use and accurate in measurement.

The pressure measuring device of the present invention includes: the pressure measuring device comprises a pressure measuring cavity 1 and a body fluid flow path cavity 2 which are isolated by a flexible diaphragm 3, wherein the body fluid flow path cavity 2 is communicated with a body fluid drainage pipeline 5 to be measured in pressure; the pressure measuring cavity 1 is filled with liquid and is provided with a pressure sensor 7, the pressure measuring cavity 1 is communicated with a compensation unit 4, and the compensation unit 4 adjusts the state of the flexible diaphragm 3 by changing the volume of the pressure measuring cavity 1.

Optionally, one end of the body fluid drainage pipeline 5 to be measured is communicated with a catheter inserted into a human body, and the other end is communicated with a body fluid collecting device or a body fluid processing device, and a switch valve 51 is arranged between the body fluid collecting device or the body fluid processing device and the body fluid flow path cavity 2.

Optionally, the sidewall of the pressure measuring chamber 1 is provided with a liquid charging port 11 and a liquid discharging port 12.

Optionally, the pressure measuring chamber 1 is a cylindrical chamber, the compensation unit 4 is a piston-type compensation unit, and includes a piston 41 and a driving unit 42, the piston 41 is in sealing contact with the inner wall of the pressure measuring chamber 1, the driving unit 42 is connected to an end of the piston 41 away from the flexible diaphragm 3 to drive the piston 41 to reciprocate along the inner wall of the pressure measuring chamber 1, and the volume of the pressure measuring chamber 1 is changed by the reciprocating motion of the piston 41 to adjust the state of the flexible diaphragm 3.

Optionally, the driving unit 42 includes a motor 421, a lead screw and nut mechanism 422 and a coupling 423, the motor 421 is connected to the lead screw and nut mechanism 422 through the coupling 423, and the lead screw and nut mechanism 422 is rigidly connected to the piston 41; the rotational motion of the motor 421 is converted into the reciprocating motion of the piston 41 by the lead screw-nut mechanism 422.

Optionally, the pressure measuring device further includes a base 424, the driving unit 42 is fixed to the base 424, a start position sensor 427 and an end position sensor 428 for detecting the limit position of the piston 41 are further fixed to the base 424, and the motor 421 is a servo motor or a stepping motor.

Optionally, the pressure measuring device further comprises a linear displacement sensor 429 fixedly connected to the piston 41 for monitoring the displacement of the piston 41.

Optionally, the pressure measuring device of the present application further comprises an automatic liquid adding device 6 in simultaneous communication with the liquid inlet 11 and the liquid outlet 12.

Optionally, the automatic liquid adding device 6 includes a first electromagnetic valve 61, a first hydraulic pump 62, a first liquid storage container 63, and a second electromagnetic valve 64 connected in sequence through a pipeline, where the first electromagnetic valve 61 is communicated with the liquid adding port 11, and the second electromagnetic valve 64 is communicated with the liquid outlet 12.

Optionally, at least one sealing ring 42 is disposed between the piston 41 and the inner wall of the pressure measuring chamber 1.

Optionally, the pressure measurement device of the present application includes a pressure measurement cavity housing 13 and a diaphragm base 14, where the pressure measurement cavity housing 13 and the diaphragm base 14 are both cylindrical structures with one end closed and the other end open, the flexible diaphragm 3 is connected to the inner wall of the diaphragm base 14 in a sealing manner, the flexible diaphragm 3 and the closed end of the diaphragm base 14 enclose to form the body fluid flow cavity 2, and the closed end of the diaphragm base 14 is communicated with the body fluid drainage pipeline 5 to be measured in pressure; the open end of the pressure measuring cavity shell 13 is detachably and hermetically connected with the open end of the diaphragm base 14, the closed end of the pressure measuring cavity shell 13 is provided with a connecting port 131, and the compensation unit 4 is arranged through the connecting port 131; the flexible diaphragm 3, the side wall of the diaphragm base 14, the side wall of the pressure measuring cavity shell 13 and the compensation unit 4 jointly enclose to form the pressure measuring cavity 1.

Optionally, the pressure measurement device of the present application comprises: a pressure measuring cavity 1 and a body fluid flow path cavity 2 which are separated by a flexible diaphragm 3; the body fluid flow path cavity 2 is communicated with a body fluid drainage pipeline 5 to be measured in pressure; the pressure measuring cavity 1 is filled with liquid and is provided with a pressure sensor 7, the pressure measuring cavity 1 is communicated with a compensation unit 4, and the compensation unit 4 adjusts the state of the flexible diaphragm 3 by changing the volume of the liquid in the pressure measuring cavity 1.

Optionally, the lateral wall of pressure measuring chamber 1 is provided with filling opening 11, compensation unit 4 is the hydraulic pump, the hydraulic pump passes through filling opening 11 and pressure measuring chamber 1 intercommunication, changes the volume of the interior liquid of pressure measuring chamber 1 and adjusts the state of flexible diaphragm 3 through the liquid feeding and the flowing back of hydraulic pump.

Optionally, a liquid filling port 11 and a liquid outlet 12 are arranged on the side wall of the pressure measuring cavity 1, the compensation unit 4 includes a third electromagnetic valve 43, a second hydraulic pump 44, a second liquid storage container 45 and a fourth electromagnetic valve 46 which are sequentially connected through a pipeline, the third electromagnetic valve 43 is communicated with the liquid filling port 11, the fourth electromagnetic valve 46 is communicated with the liquid outlet 12, and the volume of the liquid in the pressure measuring cavity 1 is changed through liquid filling and draining of the second hydraulic pump 44 to adjust the state of the flexible diaphragm 3.

Optionally, the pressure measurement device of the present application includes a pressure measurement cavity housing 13 and a diaphragm base 14, where the pressure measurement cavity housing 13 and the diaphragm base 14 are both cylindrical structures with one end closed and the other end open, the flexible diaphragm 3 is connected to the inner wall of the diaphragm base 14 in a sealing manner, the flexible diaphragm 3 and the closed end of the diaphragm base 14 enclose to form the body fluid flow cavity 2, and the closed end of the diaphragm base 14 is communicated with the body fluid drainage pipeline 5 to be measured in pressure; the open end of the pressure measuring cavity shell 13 is detachably and hermetically connected with the open end of the diaphragm base 14, and the flexible diaphragm 3, the side wall of the diaphragm base 14 and the pressure measuring cavity shell 13 jointly enclose to form the pressure measuring cavity 1.

Optionally, the pressure sensing chamber housing 13 and the diaphragm base 14 are made of a rigid material.

Optionally, the outer wall of the open end of the pressure measuring chamber housing 13 is provided with an openable buckle 132, and the outer wall of the open end of the diaphragm base 14 is provided with a flange 141 which is matched with the openable buckle 132.

Optionally, the flexible membrane 3 is a non-elastic membrane.

Optionally, the pressure measuring device is mounted on the host, and the pressure sensor 7 is electrically connected to the host.

The utility model also provides a urodynamic instrument which comprises a host and the pressure measuring device, wherein the pressure measuring device is arranged on the host, and the pressure sensor 7 is electrically connected with the host.

Advantageous effects

The pressure measuring device has the advantages that the structure is simple, the use is convenient, the pressure sensor is not in direct contact with body fluid, the risk of infection in vivo caused by the pollution of the body fluid by the pressure sensor is reduced, and the manufacturing cost is low; the pressure measuring device is provided with the compensation unit, the compensation unit can adjust the state of the flexible diaphragm, so that the flexible diaphragm is in a free state, the pressure of body fluid can be transmitted into the pressure measuring cavity without error, and the pressure measuring result is more accurate.

The pressure measuring device has two adjusting modes for the flexible isolating membrane, one is that the volume of liquid in the pressure measuring cavity is not changed, and the state of the flexible membrane is changed by changing the cavity volume of the pressure measuring cavity; the other is that the cavity volume of the pressure measuring cavity is not changed, but the volume of liquid in the pressure measuring cavity is changed to change the state of the flexible isolation membrane. Therefore, the pressure measuring device is flexible in structural design and can be reasonably selected and designed according to specific use scenes.

In the prior art, gas is filled in the pressure measuring cavity, and the gas compensated by the compensation device is not a fixed constant because of compressibility of the gas, so that the state of the flexible isolation membrane is adjusted before the device is used each time; the pressure measuring cavity of the pressure measuring device is filled with liquid, and the liquid has incompressibility, so that the pressure measuring device is debugged once through the compensation unit before being used, and the flexible diaphragm is in the best state; when the device is used again, the device does not need to be debugged again, and is convenient to use. In addition, due to incompressibility of liquid, the pressure measuring device can conduct pressure fluctuation or instantaneous pressure of body fluid to be measured to the pressure measuring cavity quickly, and therefore online quick detection is achieved.

The pressure sensor in the pressure measuring device of the urodynamic instrument can be repeatedly used, so that the economic burden of a patient is lightened, and meanwhile, the flexible diaphragm is in the optimal state through the compensation and adjustment of the compensation unit, so that the accuracy of measured data can be ensured.

Drawings

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the utility model, as detailed in the claims.

FIG. 1 is a schematic structural diagram of a first embodiment of a pressure measurement device according to the present invention;

FIG. 2 is a schematic structural diagram of a second embodiment of a pressure measurement device according to the present invention;

FIG. 3 is a schematic structural diagram of a third embodiment of a pressure measurement device according to the present invention;

FIG. 4 is a schematic structural diagram of a fourth embodiment of a pressure measurement device according to the present invention;

FIG. 5 is a schematic structural diagram of a fifth embodiment of a pressure measurement device according to the present invention;

fig. 6 is a schematic structural diagram of a sixth embodiment of the pressure measurement device according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The pressure measuring device is used for being connected to a body fluid drainage pipeline, and measuring the body fluid pressure when the downstream of the body fluid drainage pipeline is cut off or closed. The following describes and explains a specific embodiment of the present invention by taking as an example the use of the pressure measuring device of the present invention for the measurement of urine pressure, but the present invention is not limited to the measurement of urine pressure, and the present invention can also be used for the measurement of dialysis blood pressure, intracranial cerebrospinal pressure, invasive blood pressure, and the like.

Referring to fig. 1, specifically, the pressure measuring device of the present invention includes: the pressure measuring device comprises a pressure measuring cavity 1 and a body fluid flow path cavity 2 which are isolated by a flexible diaphragm 3, wherein the body fluid flow path cavity 2 is communicated with a body fluid drainage pipeline 5 to be measured in pressure; the pressure measuring cavity 1 is filled with liquid, and a pressure sensor 7 is arranged in the pressure measuring cavity 1; meanwhile, the pressure measuring cavity 1 is communicated with a compensation unit 4, and the compensation unit 4 adjusts the state of the flexible diaphragm 3 by changing the volume of the pressure measuring cavity 1. Under the working condition, urine discharged by a human body is filled in the body fluid flow path cavity 2, the pressure measuring cavity 1 is filled with liquid, the pressure of the urine is transmitted to the liquid in the pressure measuring cavity 1 through the flexible diaphragm 3, and the pressure sensor 7 positioned in the pressure measuring cavity 1 carries out pressure acquisition; if the flexible diaphragm 3 swings or deforms to a greater extent under the pressure of the liquid in the pressure measuring cavity 1 or the body fluid flow path cavity 2 in the pressure transmission process, the accuracy of the pressure transmission is affected to a certain extent, and in order to improve the accuracy of the urine pressure measurement, the pressure measuring cavity 1 is communicated with a compensation unit 4. The compensation unit 4 is used for changing the volume of the cavity of the pressure measuring cavity 1, so as to change the state of the flexible diaphragm 3, so that the flexible diaphragm 3 is in a substantially free state, thereby improving the consistency of the pressure in the pressure measuring cavity 1 and the pressure in the body fluid flow path cavity 2, namely improving the accuracy of urine pressure measurement.

Specifically, the state of the flexible diaphragm 3 in the present application refers to a state in which the flexible diaphragm 3 is raised toward the pressure measurement chamber 1, a state in which the flexible diaphragm 3 is raised toward the body fluid flow path chamber 2, or a state in which the flexible diaphragm 3 is substantially free.

The specific mechanical structure of the pressure measuring chamber 1 and the body fluid flow path chamber 2 may be, but is not limited to, the following specific structure.

The pressure measuring device comprises a pressure measuring cavity shell 13 and a diaphragm base 14, wherein the pressure measuring cavity shell 13 and the diaphragm base 14 are both of cylindrical structures with one ends closed and the other ends open, a flexible diaphragm 3 is connected to the inner wall of the diaphragm base 14 in a sealing manner, the flexible diaphragm 3 and the closed end of the diaphragm base 14 are enclosed to form the body fluid flow cavity 2, and the closed end of the diaphragm base 14 is communicated with a body fluid drainage pipeline 5 to be measured in pressure; the open end of the pressure measuring cavity shell 13 is detachably and hermetically connected with the open end of the diaphragm base 14, the closed end of the pressure measuring cavity shell 13 is provided with a connecting port 131, and the compensation unit 4 is arranged in the connecting port 131 in a penetrating manner; the flexible diaphragm 3, the side wall of the diaphragm base 14, the side wall of the pressure measuring cavity shell 13 and the compensation unit 4 jointly enclose to form the pressure measuring cavity 1.

In the present invention, it is preferable to avoid the influence of the deformation of the casings of the pressure measuring chamber 1 and the body fluid flow path chamber 2 on the urine pressure measurement result; the pressure measuring cavity shell 13 and the diaphragm base 14 are both made of rigid materials. Preferably, the flexible membrane 3 is a non-elastic membrane.

Several alternative embodiments of the utility model are described in detail below.

Example one

Referring to fig. 1, the present embodiment provides a pressure measuring device, and the conducting medium for measuring the pressure in the pressure chamber 1 in the present embodiment is liquid, preferably water.

The pressure measuring device specifically comprises a pressure measuring cavity shell 13, a diaphragm base 14, a flexible diaphragm 3 and a compensation unit 4, wherein the pressure measuring cavity shell 13 and the diaphragm base 14 are both of cylindrical structures with one ends closed and the other ends open, the flexible diaphragm 3 is connected to the inner wall of the diaphragm base 14 in a sealing manner, the flexible diaphragm 3 and the closed end of the diaphragm base 14 are enclosed to form the body fluid flow cavity 2, and the closed end of the diaphragm base 14 is communicated with a body fluid drainage pipeline 5 to be measured in pressure; the open end of the diaphragm base 14 is inserted into the open end of the pressure measuring cavity housing 13, and at least one sealing ring 42 is arranged between the outer wall of the inserted diaphragm base 14 and the inner wall of the pressure measuring cavity housing 13. The closed end of the pressure measuring cavity shell 13 is provided with a connecting port 131, and the compensation unit 4 is arranged through the connecting port 131. The compensation unit 4 is a piston type compensation unit and comprises a piston 41 and a driving unit 42, the piston 41 is in sealing contact with the inner wall of the pressure measuring cavity 1, and the flexible diaphragm 3, the side wall of the diaphragm base 14, the side wall of the pressure measuring cavity shell 13 and the end face of the piston 41 jointly enclose to form the pressure measuring cavity 1. The driving unit 42 is connected to an end of the piston 41 away from the flexible diaphragm 3 to drive the piston 41 to reciprocate along the inner wall of the pressure measuring chamber 1, and the reciprocating motion of the piston 41 changes the volume of the cavity in the pressure measuring chamber 1 to adjust the state of the flexible diaphragm 3. Further, the piston 41 includes an integrally formed sealing portion 411, a connecting portion 412, the sealing portion 411 is in sealing contact with the inner wall of the pressure measurement chamber housing 13, at least one sealing ring 42 is disposed between the outer wall of the sealing portion 411 and the inner wall of the pressure measurement chamber housing 13, and the connecting portion 412 passes through the connecting port 131 and is connected to the driving unit 42.

Further, the driving unit 42 includes a motor 421, a lead screw and nut mechanism 422 and a coupling 423, the motor 421 is connected with the lead screw and nut mechanism 422 through the coupling 423, and the lead screw and nut mechanism 422 is rigidly connected with the connecting portion 412 of the piston 41; the rotational motion of the motor 421 is converted into the reciprocating motion of the piston 41 by the lead screw-nut mechanism 422. The driving unit 42 further comprises a base 424, a lead screw fixing frame 425 and a piston fixing frame 426, the motor 421 is fixed at the approximate tail of the base 424, the lead screw nut mechanism 422 is fixed to the base 424 through the lead screw fixing frame 425, the lead screw nut mechanism 422 is connected to the connecting part 412 of the piston 41 through the piston fixing frame 426, and the base 424 is simultaneously connected with the pressure measuring cavity shell 13, so that the operation stability of the driving unit 42 is ensured through the connection and fixing modes.

In the present embodiment, the driving source of the reciprocating linear motion of the piston is derived from a motor and a lead screw-nut mechanism, but it should be understood that the driving source of the reciprocating linear motion of the piston in the present application can be various, such as a motor-driven belt transmission mechanism, a rack and pinion mechanism, and the like.

Further, in order to ensure the reliability and detachability of the connection between the pressure measuring chamber housing 13 and the diaphragm base 14, the outer wall of the open end of the pressure measuring chamber housing 13 is provided with an openable and closable buckle 132, and the outer wall of the open end of the diaphragm base 14 is provided with a flange 141 which is engaged with the openable and closable buckle 132. In the assembling process, the open end of the diaphragm base 14 is aligned with the open end of the pressure measuring cavity shell 13, the diaphragm base 14 is pushed horizontally to push the flange 141 of the diaphragm base 14 into the openable buckle 132 of the pressure measuring cavity shell 13, and the openable buckle 132 is clamped and fixed with the flange 141; in the detaching process, the tail end of the openable buckle 132 is pressed by a finger, so that the head end of the openable buckle 132 is tilted, and the diaphragm base 14 is detached.

Furthermore, in order to facilitate liquid charging and discharging of the liquid in the pressure measuring cavity 1, a liquid charging port 11 and a liquid discharging port 12 are formed in the side wall of the pressure measuring cavity 1.

When the pressure measuring device is used, one end of a body fluid drainage pipeline 5 to be measured in pressure is communicated with a catheter inserted into a human body, the other end of the body fluid drainage pipeline is communicated with a urine collection bag for collecting urine, and a switch valve 51 is arranged between the urine collection bag and the body fluid flow path cavity 2. When the on-off valve 51 is closed, the pressure in the body fluid flow path chamber 2 is transmitted to the liquid in the pressure measurement chamber 1 through the flexible diaphragm 3, and the measurement is performed. Before the measurement is started, the compensation unit 4 is started to debug the pressure measurement cavity 1, and after the debugging is finished, the pressure measurement is carried out. After use, the diaphragm base 14 and the pressure measuring chamber housing 13 are detached. This part of diaphragm base 14 and the catheterization pipeline 5 and the ooff valve 51 of waiting to measure pressure is as disposable consumptive material, pressure measurement chamber casing 13, compensating unit 4 and pressure sensor 7 repeatedly usable, compares with prior art's direct measurement method, and this application separates pressure sensor 7 from the consumptive material, can repeatedly use, and the cost is reduced has alleviateed patient's economic burden.

The specific method for debugging the pressure measuring cavity 1 comprises the following steps:

in the first step, the motor 421 is started, the motor 421 drives the lead screw-nut mechanism 422 connected to the coupler 423 in a rotating manner, the lead screw-nut mechanism 422 drives the piston 41 to move in a direction away from the flexible isolation film 3, when the pressure data detected by the pressure sensor 7 is rapidly reduced along with the movement of the piston 41, the motor 421 is stopped, and at this time, the position of the piston 41 is defined as a debugging starting position. This step is performed to make the flexible isolation diaphragm 3 in the limit state protruding toward the pressure measurement cavity 1, which facilitates subsequent debugging.

And secondly, continuing to start the motor 421, driving the screw-nut mechanism 422 connected with the coupler 423 by the rotation of the motor 421, driving the piston 41 to move towards the direction close to the flexible isolation membrane 3 by the screw-nut mechanism 422, displaying obvious trends of rising, horizontal and rising along with the movement of the piston 41 by the pressure data detected by the pressure sensor 7, defining the position of the piston corresponding to the starting time point of the pressure data horizontal segment as a position one, and defining the position of the piston corresponding to the ending time point of the pressure data horizontal segment as a position two. The state of the flexible membrane 3 corresponding to the position of the approximate midpoint of the line segment between the second position and the first position is defined as the optimum state of the flexible membrane 3. The adjustment is completed by continuing to drive the piston 41 by the motor 421 to the approximate midpoint of the line segment between position two and position one. In fig. 1, three states of the flexible diaphragm are shown simultaneously in order to facilitate the understanding of the state of the flexible diaphragm by a person skilled in the art. 3 (1) is the limit state that the flexible diaphragm protrudes towards the pressure measuring cavity 1; 3, the flexible diaphragm is in a substantially free state; 3, (2) is a limit state in which the flexible membrane is protruded toward the body fluid flow path chamber 2.

After the pressure measurement is finished, opening the liquid outlet 12, pumping the water in the pressure measurement cavity 1 from the liquid outlet 12 by using a pumping device, and taking down the consumable; the piston 41 is placed at a substantially middle position, and a new consumable can be continuously installed for pressure measurement.

The pressure measurement results of the pressure measurement device disclosed in the present application are verified by specific experiments.

A set of pressure measurement devices of the present application was prepared in which the pressure measurement chamber 1 was filled with water and connected to a 10mL syringe filled with water. The body fluid flow path chamber 2 communicates with a water injection tube, and water is filled into the body fluid flow path chamber 2 through the water injection tube. For convenience of description and data recording, the pressure measurement chamber 1 is defined as a blind end, and the body fluid flow circuit chamber 2 is defined as a through end. The blind end and the through end are respectively provided with a pressure sensor for detecting the liquid pressure in the cavity, the two pressure sensors are respectively connected to the pressure display device, and the two pressure sensors are directly connected to the two urine dynamic instruments in the experiment.

The blind-ended syringe (0.2 mL for each advance of the 10mL syringe) was advanced gradually and the pressure data detected at the blind end was recorded. See table below:

as can be seen from the above table, the pressure data at the blind end shows obvious rising, horizontal and rising trends. The optimal position of the injector is calculated from the level segment of the pressure data. Syringe advance displacement corresponding to the horizontal segment start point + (syringe advance displacement corresponding to the horizontal segment end point-syringe advance displacement corresponding to the horizontal segment start point)/2 =1.8+ (4-1.8)/2= 2.9. I.e. the syringe is in the optimal position when it is pushed up to 2.9cm, and the corresponding flexible membrane is in the optimal state, which is now in a substantially natural state.

Positioning the injector to 2.9cm, gradually pressurizing to the open end via the water injection tube, and recording the pressure at the blind end and the open endForce data. See Table below (units cmH)₂O）：

Blind end	112	116	121	133	140	146	153	159	167	173	181	187	190	192	200	204
																	Through terminal	112	116	121	133	140	146	153	159	167	173	181	187	190	192	200	204
Difference value	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

As can be seen from the verification data, the data of the blind end and the data of the through end are highly consistent. That is, by comparing the pressure in the pressure measuring chamber 1 with the pressure in the body fluid flow path chamber 2, the pressure measuring device of the present application can be obtained to have the same pressure value as the pressure value measured by directly contacting the body fluid.

Example two

Referring to fig. 2, the present embodiment provides another pressure measurement device.

The pressure measuring device of the present embodiment is similar to the first embodiment in specific structure, and is different in that the pressure measuring device of the present embodiment further includes a start position sensor 427 and an end position sensor 428 for detecting the limit position of the piston 41, both the start position sensor 427 and the end position sensor 428 are fixed to the base 424, and the motor 421 is a servo motor or a stepping motor.

At the time of power-on setting, the piston 41 is placed at a position approximately midway between the extreme positions on both sides of the piston 41 by the rotation of the motor 421 and the monitoring of the starting position sensor 427 and the ending position sensor 428. Through setting up two extreme position sensors, can make motor 421 automatic control piston 41 and place piston 41 in roughly intermediate position, for the installation of consumptive material provides sufficient surplus, the start setting is automatic to be accomplished, need not artificial interference, convenient to use is swift.

After the consumable is installed, liquid is injected into the pressure measuring cavity 1 through the liquid filling port 11. The motor 421 is then activated again to adjust the flexible membrane 3 to the optimum condition. The adjustment process is the same as that of the first embodiment, and is not described herein again.

EXAMPLE III

Referring to fig. 3, the present embodiment provides another pressure measurement device.

The pressure measuring device of the present embodiment is similar to the first embodiment in specific structure, and is different from the first embodiment in that a set of linear displacement sensors 429 is added, one end of each linear displacement sensor 429 is fixed to the base 424, and the other end of each linear displacement sensor 429 is connected to the connecting portion 412 of the piston 41. The linear displacement sensor 429 extends and contracts with the movement of the piston 41, and feeds back the specific position of the piston 41 to the pressure measuring device. The linear displacement sensor 429 can be matched with a control system of a pressure measuring device to realize automatic adjustment of the state of the flexible diaphragm 3 and automatic detection of the body fluid pressure, and is simple to operate and convenient to use.

Example four

Referring to fig. 3, the present embodiment provides another pressure measurement device.

The pressure measuring device of the present embodiment has a similar structure to that of the first embodiment, and is different from the first embodiment in that an automatic liquid adding device 6 is disposed between a liquid inlet 11 and a liquid outlet 12, so that the pressure measuring device is more convenient and faster to use.

Specifically, the automatic liquid adding device 6 comprises a first electromagnetic valve 61, a first hydraulic pump 62, a first liquid storage container 63 and a second electromagnetic valve 64 which are sequentially connected through a pipeline, wherein the first electromagnetic valve 61 is communicated with the liquid adding opening 11, and the second electromagnetic valve 64 is communicated with the liquid outlet 12. Before pressure measurement, a power supply is started, the first electromagnetic valve 61 and the second electromagnetic valve 64 are opened simultaneously, the first hydraulic pump 62 is started to work, liquid in the first liquid storage container 63 is added into the pressure measurement cavity 1 through the liquid adding opening 11 until liquid flows back to the first liquid storage container 63 from the liquid outlet 12, and the first electromagnetic valve 61 and the second electromagnetic valve 64 are closed to finish automatic liquid adding. Other structures and working principles are the same as those of the first embodiment, and will not be described in detail herein.

In addition, the present application may also adjust the state of the flexible membrane 3 in another way. Referring to fig. 4 and 5, the pressure measuring device comprises a pressure measuring chamber 1 and a body fluid flow path chamber 2 which are separated by a flexible diaphragm 3; the body fluid flow path cavity 2 is communicated with a body fluid drainage pipeline 5 to be measured in pressure; the pressure measuring cavity 1 is filled with liquid and is provided with a pressure sensor 7, the pressure measuring cavity 1 is communicated with a compensation unit 4, and the compensation unit 4 adjusts the state of the flexible diaphragm 3 by changing the volume of the liquid in the pressure measuring cavity 1. The specific structure and implementation thereof are detailed in the following examples five and six.

EXAMPLE five

Referring to fig. 5, the pressure measuring device includes a pressure measuring cavity housing 13 and a diaphragm base 14, the pressure measuring cavity housing 13 and the diaphragm base 14 are both cylindrical structures with one end closed and the other end open, the flexible diaphragm 3 is connected to the inner wall of the diaphragm base 14 in a sealing manner, the flexible diaphragm 3 and the closed end of the diaphragm base 14 enclose to form the body fluid flow path cavity 2, and the closed end of the diaphragm base 14 is communicated with the body fluid drainage pipeline 5 to be measured in pressure; the open end of the pressure measuring cavity shell 13 is detachably and hermetically connected with the open end of the diaphragm base 14, and the flexible diaphragm 3, the side wall of the diaphragm base 14 and the pressure measuring cavity shell 13 jointly enclose to form the pressure measuring cavity 1. The side wall of the pressure measuring cavity 1 is provided with a liquid filling port 11. The pressure measuring cavity 1 is communicated with a compensation unit 4, and the compensation unit 4 can specifically select a hydraulic pump 4-1. The hydraulic pump 4-1 is connected to the liquid filling port 11 through a pipeline, and the liquid volume in the pressure measuring cavity 1 is changed through liquid filling and liquid discharging of the hydraulic pump 4-1, so that the state of the flexible diaphragm 3 is changed.

The difference between the present embodiment and the first embodiment is that the specific structure, form and principle of the compensation unit 4 are different. This embodiment changes the volume of the interior liquid of pressure measurement chamber and adjusts flexible diaphragm 3's state through the hydraulic pump carries out liquid feeding and flowing back in to the pressure measurement intracavity, and its overall structure is simple, convenient operation.

The specific method for debugging the pressure measuring cavity 1 in the embodiment is as follows: starting the hydraulic pump 4-1, adding liquid into the pressure measuring cavity 1 by the hydraulic pump 4-1, sucking the liquid in the pressure measuring cavity 1 by the hydraulic pump 4-1 after the liquid is added, and stopping sucking when the pressure sensor 7 detects that the pressure data begins to reduce. The operation of the step is to enable the flexible isolation diaphragm 3 to be in a limit state protruding towards the pressure measuring cavity 1, then the hydraulic pump 4-1 is continuously started to start to add liquid into the pressure measuring cavity 1, pressure data detected by the pressure sensor 7 shows obvious trends of rising, horizontal and rising along with continuous liquid adding of the hydraulic pump 4-1, the liquid discharge amount of the hydraulic pump 4-1 corresponding to the starting time point of the pressure data level section is defined as liquid discharge amount one, and the liquid discharge amount of the hydraulic pump 4-1 corresponding to the ending time point of the pressure data level section is defined as liquid discharge amount two. The state of the flexible diaphragm 3 corresponding to the intermediate value between the first and second amounts of liquid discharge is defined as the optimum state of the flexible diaphragm 3. And (4) continuing to start the hydraulic pump 4-1, and discharging half of the difference value between the second liquid discharge amount and the first liquid discharge amount, wherein the flexible diaphragm 3 is in an approximately optimal state, so that the debugging is finished.

EXAMPLE six

Referring to fig. 6, the present embodiment provides another pressure measurement device.

The pressure measuring device of this embodiment has a similar structure to that of the fifth embodiment, except that the compensation unit 4 is an automatic compensation unit. Specifically, the compensation unit 4 includes a third electromagnetic valve 43, a second hydraulic pump 44, a second liquid storage container 45 and a fourth electromagnetic valve 46 which are connected in sequence through a pipeline, the third electromagnetic valve 43 is communicated with the liquid filling port 11, the fourth electromagnetic valve 46 is communicated with the liquid outlet 12, and the volume of the liquid in the pressure measuring cavity 1 is adjusted through liquid filling and discharging of the second hydraulic pump 44 so as to adjust the state of the flexible diaphragm 3.

The specific method for debugging the pressure measuring cavity 1 in the embodiment is as follows: and starting the second hydraulic pump 44, opening the third electromagnetic valve 43 and the fourth electromagnetic valve 46, filling liquid into the pressure measuring cavity 1 by the second hydraulic pump 44 until liquid flows back from the second liquid storage container 45, and closing the fourth electromagnetic valve 46. The second hydraulic pump 44 continues to operate to pump the liquid in the pressure measuring chamber 1, and when the pressure sensor 7 detects that the pressure data starts to decrease, the pumping is stopped. The operation of this step is to make the flexible isolating diaphragm 3 in the limit state protruding towards the pressure measuring chamber 1, and then continue to add liquid through the third electromagnetic valve 43, the pressure data detected by the pressure sensor 7 shows obvious rising, level and rising trends along with the continuous liquid adding of the second hydraulic pump 44, the liquid discharge amount of the second hydraulic pump 44 corresponding to the starting time point of the pressure data level segment is defined as liquid discharge amount one, and the liquid discharge amount of the second hydraulic pump 44 corresponding to the ending time point of the pressure data level segment is defined as gas discharge amount two. The state of the flexible diaphragm 3 corresponding to the intermediate value between the first and second amounts of liquid discharge is defined as the optimum state of the flexible diaphragm 3. The second hydraulic pump 44 is continuously actuated to discharge half of the difference between the second displacement and the first displacement, and the flexible diaphragm 3 is in a substantially optimal state, so that the adjustment is completed.

The adjustment of the flexible isolation membrane of the pressure measuring device in the embodiment can be automatically completed, the efficiency is high, and the use is convenient.

The utility model also provides a urodynamic instrument which comprises a host and the pressure measuring device disclosed by the utility model, wherein the pressure measuring device is arranged on the host, and the pressure sensor 7 is electrically connected with the host. The pressure measuring device is communicated with the catheter and the urine collecting bag. When the urine dynamometer is used, the pressure measuring device can be automatically debugged through a control system of the urine dynamometer, and the urine dynamometer is convenient to use; the pressure sensor 7 is positioned in the pressure measuring cavity 7 and is not in direct contact with urine, so that the infection in the body of a patient is not caused, and the pressure sensor 7 can be repeatedly used; meanwhile, the pressure measuring cavity is internally provided with the compensation unit 4, so that the error of the pressure transmitted by the flexible isolation film can be avoided, the measurement is accurate, and the overall cost is low.

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the utility model and are not to be construed as limiting the utility model. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.

Claims (19)

1. A pressure measurement device, characterized in that it comprises: the device comprises a pressure measuring cavity (1) and a body fluid flow path cavity (2) which are isolated by a flexible diaphragm (3), wherein the body fluid flow path cavity (2) is communicated with a body fluid drainage pipeline (5) to be measured; the pressure measuring cavity (1) is filled with liquid and is provided with a pressure sensor (7), the pressure measuring cavity (1) is communicated with a compensation unit (4), and the compensation unit (4) adjusts the state of the flexible diaphragm (3) by changing the volume of the pressure measuring cavity (1).

2. The pressure measuring device according to claim 1, wherein the body fluid drainage tube (5) to be measured is communicated with a catheter inserted into a human body at one end and with a body fluid collecting device or a body fluid processing device at the other end, and an on-off valve (51) is provided between the body fluid collecting device or the body fluid processing device and the body fluid flow path chamber (2).

3. Pressure measuring device according to claim 1, characterized in that the side wall of the pressure measuring chamber (1) is provided with a filling opening (11) and a liquid outlet (12).

4. Pressure measuring device according to claim 1, characterized in that the pressure measuring chamber (1) is a cylindrical chamber, the compensating unit (4) is a piston-type compensating unit comprising a piston (41) and a driving unit (42), the piston (41) is in sealing contact with the inner wall of the pressure measuring chamber (1), the driving unit (42) is connected to one end of the piston (41) remote from the flexible diaphragm (3) for driving the piston (41) to reciprocate along the inner wall of the pressure measuring chamber (1), and the state of the flexible diaphragm (3) is adjusted by changing the volume of the pressure measuring chamber (1) by the reciprocating motion of the piston (41).

5. Pressure measuring device according to claim 4, characterized in that the drive unit (42) comprises an electric motor (421), a screw-nut mechanism (422) and a coupling (423), the electric motor (421) being connected to the screw-nut mechanism (422) via the coupling (423), the screw-nut mechanism (422) being rigidly connected to the piston (41); the rotary motion of the motor (421) is converted into the reciprocating motion of the piston (41) by the lead screw and nut mechanism (422).

6. A pressure measuring device according to claim 4, characterized in that the pressure measuring device further comprises a base (424), the driving unit (42) is fixed to the base (424), a starting position sensor (427) and an end position sensor (428) for detecting the extreme positions of the piston (41) are further fixed to the base (424), and the motor (421) is a servo motor or a stepping motor.

7. A pressure measuring device according to claim 4, characterized in that the pressure measuring device further comprises a linear displacement sensor (429) fixedly connected to the piston (41) for monitoring the displacement of the piston (41).

8. A pressure measuring device according to claim 3, further comprising an automatic filling device (6) in simultaneous communication with the filling opening (11) and the outlet opening (12).

9. The pressure measuring device according to claim 8, characterized in that the automatic filling device (6) comprises a first solenoid valve (61), a first hydraulic pump (62), a first liquid storage container (63) and a second solenoid valve (64) which are connected in sequence through a pipeline, wherein the first solenoid valve (61) is communicated with the filling opening (11), and the second solenoid valve (64) is communicated with the liquid outlet (12).

10. Pressure measuring device according to claim 4, characterized in that at least one sealing ring (42) is arranged between the piston (41) and the inner wall of the pressure measuring chamber (1).

11. The pressure measuring device according to claim 1, characterized by comprising a pressure measuring chamber shell (13) and a diaphragm base (14), wherein the pressure measuring chamber shell (13) and the diaphragm base (14) are both cylindrical structures with one end closed and the other end open, the flexible diaphragm (3) is hermetically connected to the inner wall of the diaphragm base (14), the flexible diaphragm (3) and the closed end of the diaphragm base (14) enclose to form the body fluid flow path cavity (2), and the closed end of the diaphragm base (14) is communicated with a body fluid drainage pipeline (5) to be measured; the open end of the pressure measuring cavity shell (13) is detachably and hermetically connected with the open end of the diaphragm base (14), the closed end of the pressure measuring cavity shell (13) is provided with a connecting port (131), and the compensating unit (4) penetrates through the connecting port (131); the flexible diaphragm (3) and the side wall of the diaphragm base (14), the side wall of the pressure measuring cavity shell (13) and the compensation unit (4) jointly enclose to form the pressure measuring cavity (1).

12. A pressure measurement device, characterized in that it comprises: the pressure measuring cavity (1) and the body fluid flow path cavity (2) are isolated by a flexible diaphragm (3); the body fluid flow path cavity (2) is communicated with a body fluid drainage pipeline (5) to be measured in pressure; the pressure measuring cavity (1) is filled with liquid and is provided with a pressure sensor (7), the pressure measuring cavity (1) is communicated with a compensation unit (4), and the compensation unit (4) adjusts the state of the flexible diaphragm (3) by changing the volume of the liquid in the pressure measuring cavity (1).

13. Pressure measuring device according to claim 12, characterized in that the side wall of the pressure measuring chamber (1) is provided with a filling opening (11), the compensating unit (4) is a hydraulic pump which is in communication with the pressure measuring chamber (1) through the filling opening (11), and the state of the flexible diaphragm (3) is adjusted by changing the volume of the liquid in the pressure measuring chamber (1) through the filling and draining of the hydraulic pump.

14. The pressure measuring device according to claim 12, characterized in that the lateral wall of the pressure measuring chamber (1) is provided with a filling opening (11) and a liquid outlet (12), the compensating unit (4) comprises a third solenoid valve (43), a second hydraulic pump (44), a second liquid storage container (45) and a fourth solenoid valve (46) which are connected in sequence through a pipeline, the third solenoid valve (43) is communicated with the filling opening (11), the fourth solenoid valve (46) is communicated with the liquid outlet (12), and the state of the flexible diaphragm (3) is adjusted by changing the volume of the liquid in the pressure measuring chamber (1) through the filling and draining of the second hydraulic pump (44).

15. The pressure measuring device according to claim 12, characterized by comprising a pressure measuring chamber shell (13) and a diaphragm base (14), wherein the pressure measuring chamber shell (13) and the diaphragm base (14) are both cylindrical structures with one end closed and the other end open, the flexible diaphragm (3) is hermetically connected to the inner wall of the diaphragm base (14), the flexible diaphragm (3) and the closed end of the diaphragm base (14) enclose to form the body fluid flow path cavity (2), and the closed end of the diaphragm base (14) is communicated with a body fluid drainage pipeline (5) to be measured; the open end of the pressure measuring cavity shell (13) is detachably and hermetically connected with the open end of the diaphragm base (14), and the side walls of the flexible diaphragm (3) and the diaphragm base (14) and the pressure measuring cavity shell (13) jointly enclose to form the pressure measuring cavity (1).

16. Pressure measuring device according to any of claims 1-15, characterized in that the outer wall of the open end of the pressure chamber housing (13) is provided with an openable catch (132), and the outer wall of the open end of the diaphragm base (14) is provided with a flange (141) cooperating with the openable catch (132).

17. A pressure measuring device according to any of claims 1-15, characterized in that the pressure chamber housing (13) and the diaphragm base (14) are made of a rigid material.

18. A pressure measuring device according to any of claims 1-15, characterized in that the flexible diaphragm (3) is a non-elastic membrane.

19. Urodynamic instrument, characterized in that it comprises a main unit and a pressure measuring device according to any of claims 1-15, which is mounted to the main unit, the pressure sensor (7) being electrically connected to the main unit.

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