CN114632256B

CN114632256B - Bladder capacity expanding device

Info

Publication number: CN114632256B
Application number: CN202210231234.1A
Authority: CN
Inventors: 韩亮; 王寓
Original assignee: Sichuan Peoples Hospital of Sichuan Academy of Medical Sciences
Current assignee: Sichuan Peoples Hospital of Sichuan Academy of Medical Sciences
Priority date: 2022-03-10
Filing date: 2022-03-10
Publication date: 2023-07-04
Anticipated expiration: 2042-03-10
Also published as: CN114632256A

Abstract

The invention relates to the technical field of bladder function training, in particular to a bladder capacity expanding device; the bladder capacity expanding device comprises a catheter, a flushing bag, a urine collecting bag and a control unit, wherein the flushing bag is connected with the catheter through a liquid injection pipeline, and the catheter is connected with the urine collecting bag through a liquid discharge pipeline; a quantitative liquid feeding device and a first pressure sensor are sequentially arranged in the liquid feeding direction of the liquid injection pipeline; a second pressure sensor and a first flow sensor are sequentially arranged in the liquid outlet direction of the liquid discharge pipeline; the liquid injection pipeline and the liquid discharge pipeline are provided with electric control valves, and the electric control valves can enable the catheter to be communicated with or disconnected from any one of the liquid injection pipeline and the liquid discharge pipeline; the control unit can control the quantitative liquid feeding device and the electric control valve, and record the measured values of the first pressure sensor, the second pressure sensor and the first flow sensor. The bladder washing device can enable the washing liquid to enter the bladder at a stable flow rate, reduce the dependence on operators and reduce the burden of the operators.

Description

Bladder capacity expanding device

Technical Field

The invention relates to the technical field of bladder capacity expansion, in particular to a bladder capacity expansion device.

Background

The bladder is a hollow, elastic organ that collects urine produced by the kidneys prior to urination. Bladder urine storage and urination are reflex activities, coordinated under control of the central and peripheral nerves (sympathetic, parasympathetic and somatic).

Interstitial cystitis/bladder pain syndrome (Interstitial Cystitis, or Bladder Pain Syndrome, IC/BPSIC/PBS) is a chronic non-infectious bladder inflammatory disease, which is mainly manifested by frequent urination, urgent urination, lower abdominal or perineal pain, and recurrent or persistent pain, and the etiology and pathogenesis of the disease are still unknown, so that the clinical treatment is mainly to control symptoms and improve the quality of life. Typical bleeding and/or ulceration of the bladder mucosa under cystoscopy is a typical feature of interstitial cystitis. Bladder distension therapy and bladder perfusion are common treatments for interstitial cystitis/bladder pain syndrome. In addition, the clinical manifestations of the patients with related cystitis caused by ketamine are mainly symptoms of painful urination, frequent urination, urgent urination and urge incontinence, and the common treatment method is that the bladder water expands and is combined with bladder perfusion, but the curative effect is uncertain. The operation method of the bladder water expansion comprises the following steps: all patients pass cystoscopy under continuous epidural anesthesia, then a three-cavity air sac urinary catheter is reserved, one end of the urinary catheter is connected with a drainage bag, the height of the urinary catheter is preset to be 80-100 cm, the other lumen is connected with flushing fluid, normal saline is used for perfusing the bladder, when the water pressure reaches 80-100 cm water column, the operation is maintained for 2min, the pressure is relieved, the bladder capacity is measured, and the cystoscopy on the bladder mucosa condition is performed. The treatment method needs hospitalization, has doctor operation, and has high cost and relatively long hospitalization period.

The bladder capacity expanding device is needed for bladder expansion treatment and bladder function training, in the prior art, a bladder capacity pressure function assessment training instrument is provided, the training instrument is provided with a flushing bag, a urine collecting bag and a main catheter, the front end of the main catheter is connected with the catheter through a connector, a controllable plug is arranged at the rear end of the main catheter, a pressure sensor is arranged at the rear part of the main catheter close to the controllable plug, an automatic path changing electromagnetic valve is arranged at the front part of the main catheter, the urine collecting bag is connected with the automatic loop electromagnetic valve through a connecting pipeline, a flow sensor is arranged on the connecting pipeline of the automatic loop electromagnetic valve, a tee joint is arranged in the middle of the main catheter, the flushing bag is connected with the tee joint through a catheter, a flow regulator and a Morse drip cup are arranged on the catheter, and a capacity infrared sensor is arranged on the Morse drip cup. It has the following disadvantages: 1. the pressure sensing is far away from the bladder and is influenced by the connection of the tee joint and the Morse drip cup, so that the accuracy of the pressure sensing is low; 2. when the device is used, as the pressure of the bladder increases due to the entering of the flushing liquid into the bladder, the speed of the flushing liquid entering the bladder is slower and slower, and the period of measuring the bladder capacity is longer, so that the flow regulator needs to be regulated from time to control the flushing liquid to enter the bladder at a proper flow rate. Therefore, the requirements on operators are high and the burden is heavy.

Disclosure of Invention

Aiming at the defects existing in the prior art, the invention provides a bladder capacity expanding device which can enable flushing liquid to enter the bladder at a stable flow rate, reduce the dependence on operators and reduce the burden of the operators.

In order to achieve the purpose, the bladder capacity expanding device comprises a catheter, a flushing bag, a urine collecting bag and a control unit, wherein the flushing bag is connected with the catheter through a liquid injection pipeline, and the catheter is connected with the urine collecting bag through a liquid discharge pipeline; a quantitative liquid feeding device and a first pressure sensor are sequentially arranged in the liquid feeding direction of the liquid injection pipeline; a second pressure sensor and a first flow sensor are sequentially arranged in the liquid outlet direction of the liquid discharge pipeline; the liquid injection pipeline and the liquid discharge pipeline are provided with electric control valves, and the electric control valves can enable the catheter to be connected with or disconnected from any one of the liquid injection pipeline and the liquid discharge pipeline; the control unit can control the quantitative liquid feeding device and the electric control valve, and record the measured values of the first pressure sensor, the second pressure sensor and the first flow sensor.

In one embodiment, the catheter is provided with at least a liquid injection cavity and a liquid discharge cavity, the flushing bag is connected with the liquid injection cavity through a liquid injection pipeline, and the urine collection bag is connected with the liquid discharge cavity through the liquid discharge pipeline; the electric control valve comprises a first electromagnetic valve arranged on a connecting pipeline between the first pressure sensor and the liquid injection cavity, and a second electromagnetic valve arranged on a connecting pipeline between the second pressure sensor and the urine collecting bag.

In one embodiment, the quantitative liquid feeding device comprises a quantitative pump head, a transmission mechanism and a stepping motor, wherein the quantitative pump head comprises a pump body and a piston, a liquid suction cavity, a piston cavity, a liquid suction port and a liquid outlet are formed in the pump body, the liquid suction cavity is respectively communicated with the piston cavity, the liquid suction port and the liquid outlet, one-way valves are respectively arranged on the liquid suction port and the liquid outlet, the piston is slidably arranged in the piston cavity, and the piston can slide to be close to or far away from the liquid suction cavity; the stepping motor is in transmission connection with the piston through the transmission mechanism and can drive the piston to slide back and forth in the piston cavity; the flushing bag is connected with the liquid suction port, and the first pressure sensor is connected with the liquid outlet through a pipeline.

In one embodiment, the transmission mechanism comprises a connecting rod and a crank rod, one end of the connecting rod is connected with the piston, the other end of the connecting rod is connected with one end of the crank rod, the connecting rod, the piston and the crank rod form a crank slide block mechanism, and the axis of sliding of the piston is offset from the rotation center of the crank rod; the stroke angle of the crank rod for driving the piston to approach the liquid suction cavity is larger than the stroke angle of the crank rod for driving the piston to be far away from the liquid suction cavity; the stepping motor is in transmission connection with the crank rod and can drive the crank rod to rotate.

In one embodiment, the transmission mechanism further comprises a transmission crank member, the center of rotation of which is offset from the center of rotation of the crank rod; the center of rotation of crank arm is located the middle part of crank arm, the crank arm is kept away from the one end of connecting rod, and the skew transmission crank spare center of rotation, rotatable and slidable setting are in on the transmission crank spare, transmission crank spare rotation can drive the crank arm rotates, step motor is used for the drive transmission crank spare rotates.

In one embodiment, a chute is formed in one end of the crank rod, which is far away from the connecting rod, the chute extends along the axial direction of the crank rod, a connecting shaft is arranged on the transmission crank piece, one end of the connecting shaft is connected with the transmission crank piece, the other end of the connecting shaft is slidably inserted into the chute, and the connecting shaft can rotate in the chute.

In one embodiment, the connecting rod includes a first section connected to the piston, a second section connected to the crank rod, and an intermediate section connecting the first section and the second section; the middle section with first section the coaxial setting of second section, just the both ends of middle section respectively with first section with the second section screw-in connection, the middle section with the screw thread of first section screw-in connection revolves to, with the middle section with the screw thread of second section screw-in connection revolves to opposite.

In one embodiment, the liquid injection pipeline is further provided with a pressure relief pipeline, the pressure relief pipeline is connected with the liquid inlet end of the quantitative liquid feeding device and the liquid outlet end of the quantitative liquid feeding device, a third electromagnetic valve and a second flow sensor are connected in series on the pressure relief pipeline, and the third electromagnetic valve and the second flow sensor are connected with the control unit.

The bladder capacity expanding device in the technical scheme has at least the following advantages:

(1) The flushing liquid is sent into the bladder through the quantitative liquid sending device, so that the liquid can be sent at a uniform speed, the time for measuring the bladder capacity can be stably controlled, and the requirement and the burden on operators are reduced.

(2) The second pressure sensor is connected with the bladder through the liquid drainage cavity to measure the intravesical pressure, so that the influence of the liquid conveying pipeline on the second pressure sensor is reduced, and the accuracy of the intravesical pressure measurement is improved.

(3) The transmission mechanism controls the piston to slide in a crank sliding block mechanism mode, so that the quantitative pump head can stably convey flushing liquid in each working period, and the total liquid conveying amount of the quantitative pump head in a corresponding time period can be counted by recording the rotation number of the stepping motor.

(4) The crank rod rotates to drive the piston to be close to the stroke angle of the liquid suction cavity, and the stroke angle is larger than the stroke angle of the crank rod to drive the piston to be far away from the liquid suction cavity, so that the liquid feeding time ratio of the quantitative pump head in each working period is larger than the liquid suction time ratio, and the liquid feeding process is more gentle and stable.

(5) The transmission crank piece is matched with the crank rod and the connecting rod, so that the liquid feeding time of the quantitative pump head in each working period is more than the liquid suction time, and the stability of the liquid feeding process is further improved.

(6) The first pressure sensor monitors the liquid delivery force of the quantitative liquid delivery device and is matched with the third electromagnetic valve and the second flow sensor to release pressure, so that the bladder is prevented from being damaged due to overhigh pressure of flushing liquid.

Drawings

In order to more clearly illustrate the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described. Throughout the drawings, the elements or portions are not necessarily drawn to actual scale.

FIG. 1 is a schematic view showing the overall structure of a bladder capacity expansion apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of the quantitative liquid feeding device shown in FIG. 1;

FIG. 3 is a schematic view of the connecting rod shown in FIG. 2;

FIG. 4 is a schematic diagram of the structure of the liquid feeding device shown in FIG. 2 in parallel;

reference numerals:

1-urinary catheter, 11-liquid injection cavity, 12-liquid discharge cavity, 2-flushing bag, 3-urine collection bag and 4-control unit;

5-quantitative liquid feeding device, 51-quantitative pump head, 511-pump body, 5111-liquid suction cavity, 5112-piston cavity, 5113-liquid suction port, 5114-liquid outlet, 512-piston, 513-one-way valve, 52-transmission mechanism, 521-connecting rod, 5211-first section, 5212-second section, 5213-middle section, 522-crank rod, 5221-chute, 523-transmission crank piece, 5231-connecting shaft and 53-step motor;

61-first pressure sensor, 62-second pressure sensor, 63-first flow sensor, 64-second flow sensor, 65-first solenoid valve, 66-second solenoid valve, 67-third solenoid valve.

Detailed Description

Embodiments of the technical scheme of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and thus are merely examples, and are not intended to limit the scope of the present invention. It is noted that unless otherwise indicated, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or an implicit indication of the number of technical features being indicated. In the description of the present invention, the meaning of "plurality" is two or more unless specifically defined otherwise. Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly, as they may be fixed, removable, or integral, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

Referring to fig. 1 to 4, the bladder capacity expansion device in one embodiment includes a catheter 1, a flushing bag 2, a urine collection bag 3, a control unit 4, a quantitative liquid feeding device 5, a first pressure sensor 61, a second pressure sensor 62, and a first flow sensor 63, which can enable flushing liquid to enter the bladder at a stable flow rate, reduce reliance on operators, and reduce burden on operators.

Referring to fig. 1 and 3, in particular, the irrigation bag 2 is connected to the catheter 1 by a fluid injection line. The catheter 1 is connected with the urine collecting bag 3 through a liquid discharge pipeline. The irrigation bag 2 is used for containing irrigation liquid, such as physiological saline, injected into the bladder. The urine collection bag 3 is used for collecting urine discharged from the bladder. The liquid feeding direction of the liquid filling pipeline is sequentially provided with a quantitative liquid feeding device 5 and a first pressure sensor 61. The liquid outlet direction of the liquid discharge pipeline is sequentially provided with a second pressure sensor 62 and a first flow sensor 63. The liquid injection pipeline and the liquid discharge pipeline are provided with electric control valves, and the electric control valves can enable the catheter 1 to be connected with or disconnected from any one of the liquid injection pipeline and the liquid discharge pipeline. The first pressure sensor 61 is used to measure the pressure value of the irrigation liquid fed into the bladder by the quantitative liquid feeding device 5. The second pressure sensor 62 is used to measure the pressure value within the bladder. The first flow sensor 63 is used to record the amount of urine discharged from the bladder. The catheter 1 can be in communication with the infusion line or the drainage line alone for infusing irrigation fluid into the bladder or draining urine from the bladder. In one embodiment, the catheter 1 is provided with at least a liquid filling chamber 11 and a liquid draining chamber 12. The flushing bag 2 is connected with the liquid filling cavity 11 through a liquid filling pipeline. The urine collecting bag 3 is connected with the liquid discharging cavity 12 through a liquid discharging pipeline. The electrically controlled valve comprises a first solenoid valve 65 arranged in the connection line between the first pressure sensor 61 and the filling chamber 11, and a second solenoid valve 66 arranged in the connection line between the second pressure sensor 62 and the urine collection bag 3. It can be appreciated that the catheter 1 can be a three-cavity catheter in the prior art, and the balloon cavity can be omitted on the basis of the existing three-cavity catheter to form a special catheter, so that the use cost is reduced in short-term use. The second electromagnetic valve 66 is arranged between the second pressure sensor 62 and the urine collecting bag 3, so that the second pressure sensor 62 can be communicated with the inside of the bladder through the liquid discharging cavity 12, the second pressure sensor 62 is connected with the inside of the bladder through the liquid discharging cavity 12 to measure the intravesical pressure, the influence of a liquid feeding pipeline on the second pressure sensor 62 is reduced, and the accuracy of intravesical pressure measurement is improved. In one embodiment, the catheter 1 is a single-cavity catheter or a conventional double-cavity catheter with a balloon, and the catheter 1 is connected with a liquid injection pipeline and a liquid discharge pipeline through a tee joint; the electrically controlled valve comprises a first solenoid valve 65 arranged in the connection line between the first pressure sensor 61 and the filling chamber 11, and a second solenoid valve 66 arranged in the connection line between the second pressure sensor 62 and the urine collection bag 3.

The control unit 4 is capable of controlling the dosing device 5 and the electrically controlled valve and registering the measured values of the first pressure sensor 61, the second pressure sensor 62, the first flow sensor 63. Specifically, the first pressure sensor 61 measures the pressure value of the irrigation fluid flowing into the bladder, and when the pressure value reaches the set cystometric pressure value, the control unit 4 controls the electric control valve to correspond to the quantitative fluid feeding device 5. The flushing liquid is sent into the bladder through the quantitative liquid sending device 5, and can be sent at a uniform speed, so that the time for measuring the bladder capacity is stably controlled, the liquid sending speed is not required to be adjusted by an operator, and the requirement and the burden on the operator are reduced.

In one embodiment, the quantitative liquid feeding device 5 includes a quantitative pump head 51, a transmission mechanism 52, and a stepping motor 53. The dosing pump head 51 includes a pump body 511 and a piston 512. The pump body 511 is provided with a suction chamber 5111, a piston chamber 5112, a suction port 5113 and a liquid outlet 5114. The pumping chamber 5111 communicates with the piston chamber 5112, the pumping port 5113 and the liquid outlet 5114, respectively. The liquid suction port 5113 and the liquid outlet 5114 are respectively provided with a one-way valve 513. The piston 512 is slidably disposed within the piston chamber 5112, and the piston 512 can slide toward and away from the suction chamber 5111. The stepper motor 53 is drivingly coupled to the piston 512 by a drive mechanism 52 and is capable of driving the piston 512 to reciprocate within the piston chamber 5112. The flushing bag 2 is connected to the liquid suction port 5113, and the first pressure sensor 61 is connected to the liquid outlet 5114 through a pipeline. Specifically, the stepping motor 53 is connected to the control unit 4. The check valve 513 is provided according to the liquid feeding direction. The stepper motor 53 slides the piston 512 through the transmission 52 to change the total volume in the pumping chamber 5111 and the piston chamber 5112, and to change the pressure in the chamber, so that the flushing fluid flows in from the one-way valve 513 of the pumping port 5113 and flows out through the one-way valve 513 of the outlet 5114. The reciprocation of the piston 512 is established so that the volume of rinse solution delivered during each reciprocation period is equal. The flushing liquid can be stably conveyed. Specifically, the transmission mechanism 52 includes a link 521 and a crank lever 522. One end of the connecting rod 521 is connected to the piston 512, the other end of the connecting rod 521 is connected to one end of the crank rod 522, and forms a slider-crank mechanism with the piston 512 and the crank rod 522, and the axis of sliding of the piston 512 is offset from the rotation center of the crank rod 522. The angle of travel of the crank rod 522 to rotate the drive piston 512 toward the suction chamber 5111 is greater than the angle of travel of the crank rod 522 to rotate the drive piston 512 away from the suction chamber 5111. The stepper motor 53 is drivingly coupled to the crank rod 522 and is capable of driving the crank rod 522 to rotate. The transmission mechanism 52 controls the piston 512 to slide in a crank sliding block mechanism mode, so that the quantitative pump head 51 can stably convey flushing liquid in each working period, and the total liquid conveying amount of the quantitative pump head 51 in a corresponding time period can be counted by recording the rotation number of the stepping motor 53. The angle of travel of the crank rod 522 to rotate the drive piston 512 toward the suction chamber 5111 is greater than the angle of travel of the crank rod 522 to rotate the drive piston 512 away from the suction chamber 5111. The liquid feeding time duty ratio of the quantitative pump head 51 in each working period is larger than the liquid suction time duty ratio, so that the liquid feeding process is more gentle and stable.

In one embodiment, the transmission 52 further includes a transmission crank member 523. The rotation center of the transmission crank member 523 is offset from the rotation center of the crank lever 522. The center of rotation of the crank rod 522 is provided in the middle of the crank rod 522. The end of the crank lever 522 remote from the connecting rod 521 is offset from the rotation center of the transmission crank member 523, and is rotatably and slidably provided on the transmission crank member 523. The rotation of the driving crank member 523 can drive the crank lever 522 to rotate, and the stepping motor 53 is used to drive the driving crank member 523 to rotate. Specifically, the end of the crank rod 522 remote from the connecting rod 521 is provided with a chute 5221. The runner 5221 extends in the axial direction of the crank rod 522. The transmission crank member 523 is provided with a connecting shaft 5231, one end of the connecting shaft 5231 is connected with the transmission crank member 523, the other end of the connecting shaft 5231 is slidably inserted into the chute 5221, and the connecting shaft 5231 can rotate in the chute 5221. In one embodiment, the body of the quantitative liquid feeding device 5 is provided with a fixed shaft on which the transmission crank member 523 is mounted, and the transmission crank member 523 is rotatably disposed on the fixed shaft. The rotation axis of the crank lever 522 is disposed on the fixed shaft off the center of the fixed shaft. When the transmission crank 523 rotates so that the connecting shaft 5231 is closer to the rotation center of the crank 522, the angular velocity of rotation of the crank 523 is high; when the connecting shaft 5231 is far from the rotation center of the crank lever 522, the angular velocity of rotation of the crank member 523 is large. The connecting rod 521 and the driving crank member 523 are connected to both ends of the crank rod 522, respectively. When the connecting shaft 5231 is far from the rotation center of the crank shaft 522, the piston 512 is in a stroke close to the suction chamber 5111. When the connecting shaft 5231 is closer to the rotation center of the crank lever 522, the piston 512 is in a stroke away from the liquid suction chamber 5111. The transmission crank member 523 is matched with the crank rod 522 and the connecting rod 521, so that the liquid feeding time of the constant delivery pump head 51 in each working cycle is further more than the liquid suction time, and the stability of the liquid feeding process is further improved. It is understood that the correspondence between the angular velocity of the rotation of the crank member 523 and the piston 512 can be adjusted by changing the rotational center position of the crank rod 522 and the connection between the connecting rod 521 and the transmission crank member 523 and the crank rod 522.

Referring to fig. 4, in one embodiment, the number of the quantitative liquid feeding devices 5 is two, the liquid suction ports 5113 and the liquid outlet ports 5114 of the two quantitative liquid feeding devices 5 are respectively connected in parallel, and the crank member 523 rotates to make the phase angles of the liquid suction and the liquid feeding of the corresponding quantitative pump heads 51 respectively staggered. The two quantitative liquid feeding devices 5 are used for alternately absorbing liquid and feeding liquid, so that the liquid feeding flow is more balanced, and the stability of the liquid feeding process is further improved.

Referring to fig. 3, in one embodiment, the connecting rod 521 includes a first segment 5211 coupled to the piston 512, a second segment 5212 coupled to the crank rod 522, and an intermediate segment 5213 connecting the first segment 5211 and the second segment 5212. The middle section 5213 is coaxially arranged with the first and

second sections

5211 and 5212, and two ends of the middle section 5213 are respectively connected with the first and

second sections

5211 and 5212 in a threaded manner. The thread of the intermediate section 5213 threaded to the first section 5211 is in the opposite thread of the intermediate section 5213 threaded to the second section 5212. The intermediate section 5213 rotates the overall length of the adjustment link 521, changing the stroke length of the reciprocation of the piston 512. Thereby changing the delivery amount of the single liquid delivery of the metering pump head 51. The quantitative liquid feeding device 5 is adapted to different working conditions, and the stepping motor 53 is at a proper rotation speed to feed liquid at a certain frequency.

Referring to fig. 1 and 2 again, in an embodiment, a pressure relief pipeline is further provided on the liquid injection pipeline, the pressure relief pipeline is connected to the liquid inlet end of the quantitative liquid feeding device 5 and the liquid outlet end of the quantitative liquid feeding device 5, a third electromagnetic valve 67 and a second flow sensor 64 are serially provided on the pressure relief pipeline, and the third electromagnetic valve 67 and the second flow sensor 64 are connected with the control unit 4. Specifically, the pressure relief pipeline is connected with the liquid suction port 5113 and the liquid outlet 5114 of the quantitative pump head 51 through a tee joint. When in use, the first pressure sensor 61 monitors the liquid feeding pressure of the quantitative liquid feeding device 5 and is matched with the third electromagnetic valve 67 and the second flow sensor 64 to release pressure, so that the bladder is prevented from being damaged due to overhigh pressure of flushing liquid. The second flow sensor 64 measures the amount of irrigation fluid discharged at the pressure relief in order to calculate the total amount of fluid flowing into the bladder. And the measurement accuracy is improved.

The bladder capacity expansion device of the present invention is based on the principle that: the pipeline is pre-flushed and connected before use, and air in the pipeline is discharged. The control unit 4 firstly controls the liquid injection pipeline to be communicated with the catheter 1, the quantitative liquid feeding device 5 feeds flushing liquid from the flushing bag 2 into the bladder, and the liquid feeding amount of the quantitative liquid feeding device 5 and the measured values of the first pressure sensor 61 and the second pressure sensor 62 are recorded; when the first pressure sensor 61 reaches a set value, the liquid injection pipeline and the catheter 1 are disconnected, and the catheter 1 is communicated with a liquid discharge pipeline; the measurements of the first flow sensor 63 and the second pressure sensor 62 are recorded. Bladder pressure can be obtained by processing the measurements of the first pressure sensor 61 and the second pressure sensor 62; the bladder capacity and the urine volume produced by metabolism during the measurement time can be obtained from the recorded fluid feeding volume and the recorded value of the first flow sensor 63. The corresponding test value is accurate and reliable; the flushing liquid can enter the bladder at a stable flow rate in the measuring process, so that the dependence on operators is reduced, and the burden of the operators is reduced.

The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description.

Claims

1. The bladder capacity expanding device comprises a catheter, a flushing bag, a urine collecting bag and a control unit, and is characterized in that the flushing bag is connected with the catheter through a liquid injection pipeline, and the catheter is connected with the urine collecting bag through a liquid discharge pipeline; a quantitative liquid feeding device and a first pressure sensor are sequentially arranged in the liquid feeding direction of the liquid injection pipeline; a second pressure sensor and a first flow sensor are sequentially arranged in the liquid outlet direction of the liquid discharge pipeline; the liquid injection pipeline and the liquid discharge pipeline are provided with electric control valves, and the electric control valves can enable the catheter to be connected with or disconnected from any one of the liquid injection pipeline and the liquid discharge pipeline; the control unit can control the quantitative liquid feeding device and the electric control valve and record the measured values of the first pressure sensor, the second pressure sensor and the first flow sensor;

the quantitative liquid feeding device comprises a quantitative pump head, a transmission mechanism and a stepping motor, wherein the quantitative pump head comprises a pump body and a piston, a liquid suction cavity, a piston cavity, a liquid suction port and a liquid outlet are arranged on the pump body, the liquid suction cavity is respectively communicated with the piston cavity, the liquid suction port and the liquid outlet, check valves are respectively arranged on the liquid suction port and the liquid outlet, the piston is slidably arranged in the piston cavity, and the piston can be close to or far away from the liquid suction cavity; the stepping motor is in transmission connection with the piston through the transmission mechanism and can drive the piston to slide back and forth in the piston cavity; the flushing bag is connected with the liquid suction port, and the first pressure sensor is connected with the liquid outlet through a pipeline;

the transmission mechanism comprises a connecting rod and a crank rod, one end of the connecting rod is connected with the piston, the other end of the connecting rod is connected with one end of the crank rod, the connecting rod, the piston and the crank rod form a crank slide block mechanism, and the sliding axis of the piston and the rotating center of the crank rod deviate; the stroke angle of the crank rod for driving the piston to approach the liquid suction cavity is larger than the stroke angle of the crank rod for driving the piston to be far away from the liquid suction cavity; the stepping motor is in transmission connection with the crank rod and can drive the crank rod to rotate;

the transmission mechanism further comprises a transmission crank piece, and the rotation center of the transmission crank piece is deviated from the rotation center of the crank rod; the rotating center of the crank rod is arranged in the middle of the crank rod, one end of the crank rod, which is far away from the connecting rod, deviates from the rotating center of the transmission crank piece, is rotatably and slidably arranged on the transmission crank piece, the rotation of the transmission crank piece can drive the crank rod to rotate, and the stepping motor is used for driving the transmission crank piece to rotate;

the connecting rod is characterized in that one end of the crank rod, which is far away from the connecting rod, is provided with a sliding groove, the sliding groove extends along the axial direction of the crank rod, the transmission crank piece is provided with a connecting shaft, one end of the connecting shaft is connected with the transmission crank piece, the other end of the connecting shaft is slidably inserted into the sliding groove, and the connecting shaft can rotate in the sliding groove;

the connecting rod comprises a first section connected with the piston, a second section connected with the crank rod and an intermediate section connected with the first section and the second section; the middle section with first section the coaxial setting of second section, just the both ends of middle section respectively with first section with the second section screw-in connection, the middle section with the screw thread of first section screw-in connection revolves to, with the middle section with the screw thread of second section screw-in connection revolves to opposite.

2. The bladder capacity expansion device according to claim 1, wherein at least a liquid injection cavity and a liquid discharge cavity are arranged on the catheter, the flushing bag is connected with the liquid injection cavity through a liquid injection pipeline, and the urine collection bag is connected with the liquid discharge cavity through the liquid discharge pipeline; the electric control valve comprises a first electromagnetic valve arranged on a connecting pipeline between the first pressure sensor and the liquid injection cavity, and a second electromagnetic valve arranged on a connecting pipeline between the second pressure sensor and the urine collecting bag.

3. The bladder capacity expansion device according to claim 1 or 2, wherein the fluid injection pipeline is further provided with a pressure relief pipeline, the pressure relief pipeline is connected with a fluid inlet end of the quantitative fluid delivery device and a fluid outlet end of the quantitative fluid delivery device, a third electromagnetic valve and a second flow sensor are connected in series on the pressure relief pipeline, and the third electromagnetic valve and the second flow sensor are connected with the control unit.