WO2012094863A1

WO2012094863A1 - Balancing device using liquid level detection for hemodialysis

Info

Publication number: WO2012094863A1
Application number: PCT/CN2011/074492
Authority: WO
Inventors: 高光勇; 甘华; 滕朝宇; 刘智勇; 任应祥
Original assignee: 重庆山外山科技有限公司
Priority date: 2011-01-14
Filing date: 2011-05-23
Publication date: 2012-07-19
Also published as: CN102068722A; CN102068722B

Abstract

A balancing device using liquid level detection for hemodialysis includes a balancer (2) and a piping system. The balancer (2) includes a shell and a diaphragm (3). The shell is hermetically separated into a first cavity (2a) and a second cavity (2b) by the diaphragm (3). The piping system includes a dialysate pipeline and a waste liquid pipeline. The dialysate pipeline includes a dialysate feeding pipeline for inputting dialysate and a dialyzer liquid input pipeline for connecting with a dialysate inlet of a hemodialyzer (1). Both the dialysate feeding pipeline and the dialyzer liquid input pipeline can be connected with or disconnected from the first cavity (2a). The waste liquid pipeline includes a waste liquid output pipeline for outputting waste liquid and a dialyzer liquid output pipeline for connecting with a waste liquid outlet of the hemodialyzer (1). Both the waste liquid output pipeline and the dialyzer liquid output pipeline can be connected with or disconnected from the second cavity (2b).

Description

Description Liquid level detection balance device for hemodialysis

The invention belongs to the technical field of blood purification, and in particular to a liquid level detecting and balancing device for hemodialysis.

Background technique

At present, dialysis equipment in blood purification generally uses a flow meter, a pressure control method or a double pump method to control the balance of dialysate and waste liquid. The disadvantages are:

1. The flow meter is used to control the balance between dialysate and waste liquid. The accuracy of the flowmeter is high, the flowmeter is complex, and it needs to be self-calibrated continuously.

2. The pressure control method is used to balance the dialysate and waste liquid. The pressure sensor signal has large fluctuation and the precision is not high.

3. The balance of liquid and waste liquid is realized by the double pump method, the processing precision of the double pump is high, and the cost of the duplex pump is high.

Summary of the invention

The technical problem to be solved by the present invention is to provide a liquid level detecting and balancing device for hemodialysis which is simple in control and high in precision.

The liquid level detecting balance device for hemodialysis of the present invention comprises a balancer and a pipeline system, the balancer comprising a casing and a diaphragm, wherein the casing is separated by a diaphragm seal to form a first chamber and a second chamber; The road system includes a dialysate line and a waste line, the dialysate line including a dialysate supply line for inputting dialysate, both for communication with the first chamber, and for dialyzing with the hemodialyzer a dialyzer inlet line connected to the liquid inlet; the waste liquid line includes a waste liquid output line for outputting waste liquid which is disconnected from the second chamber, and is used for communicating with the hemodialyzer waste liquid outlet The dialyzer outlet line.

Further, the dialysate supply line is provided with a first hydraulic pump, and the dialyzer inlet line is provided with a first a flow detector; the dialyzer outlet line is provided with a second hydraulic pump, the waste liquid output line is provided with a second flow detection, the first chamber is connected to the dialysate tube section, and the dialysate section is Connected to the dialysate supply line and the dialyzer inlet line respectively; the second chamber is connected to the waste liquid pipe section, and the waste liquid pipe section is respectively connected to the dialyzer discharge line and the waste liquid output pipe road;

Further, the dialyzer inlet line is connected in series with the first flow detector with a second solenoid valve and connected to the first end of the first three-way joint, and the dialyzer outlet line is located at the second hydraulic pump outlet a third electromagnetic valve is connected in series and connected to the first end of the second three-way joint; the second end of the first three-way joint communicates with the first chamber of the balancer through the dialysate tube section, the first three The third end of the through joint is connected in series with the first electromagnetic valve and the first hydraulic pump, and then connected to the dialysate joint; the second end of the second three-way joint communicates with the second chamber of the balancer through the waste liquid pipe joint, The third end of the second three-way joint is connected in series with the fourth liquid solenoid valve and the second flow detector, and is connected with the waste liquid joint;

In the above solution, the first hydraulic pump and the second hydraulic pump act as a power source to respectively drive the flow of the dialysate and the waste liquid. The first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve are alternately opened and closed, and the specific working conditions are: opening of the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve Closed into two phases as one cycle.

In the first phase, the first solenoid valve and the fourth solenoid valve are opened, and the second solenoid valve and the third solenoid valve are closed. At this time, the first hydraulic pump drives the dialysate to flow from the dialysate connector to the first chamber of the balancer. Moving the diaphragm in the balancer from the first chamber to the second chamber while flowing the waste liquid in the second chamber to the second flow detector and the waste connection, in the process, the second flow detection The float that comes with the device has a liquid flow, and the float is in the upper middle portion of the second flow detector. When the diaphragm is in close contact with the wall of the second chamber, the liquid flow in the second flow detector is stopped, and the float in the second flow detector stops at the bottom of the second flow detector, and the second flow After the detector of the detector detects the signal of the float, the first solenoid valve, the second solenoid valve, the third solenoid valve and the fourth solenoid valve execute the second phase through the control circuit.

In the second phase, the second solenoid valve and the third solenoid valve are opened, and the first solenoid valve and the fourth solenoid valve are closed, opposite to the first phase, at which time the second hydraulic pump drives the waste liquid outside the membrane of the hemodialyzer to balance Second chamber The chamber flows to move the diaphragm in the balancer from the second chamber toward the first chamber while flowing the dialysate in the first chamber to the outside of the first flow detector and the hemodialyzer. In the first flow detector, the float is in the upper middle portion of the first flow detector due to the liquid flow. When the diaphragm is in close contact with the wall of the first chamber, since there is no more liquid flow in the first flow detector, the float in the first flow detector stops at the bottom of the first flow detector, and the first flow rate After the detector of the detector detects the signal of the float, the first solenoid valve, the second solenoid valve, the third solenoid valve and the fourth solenoid valve are further executed by the control circuit for the next cycle.

The inner chamber formed by the first chamber and the second chamber in the balancer enters the dialysate and the second chamber of the first chamber when the diaphragm moves from the first chamber to the second chamber due to a certain volume. The discharged waste liquid is always equal. Conversely, as the diaphragm moves from the second chamber to the first chamber, the waste liquid entering the second chamber and the dialysate discharged from the first chamber are always equal. These two processes ensure that the amount of dialysate and waste liquid entering and leaving the hemodialyzer membrane is always equal. It can be seen that by controlling the number of times of switching between the first solenoid valve, the second solenoid valve, the third solenoid valve and the fourth solenoid valve per unit time, the flow rate of dialysate and waste liquid outside the membrane of the hemodialyzer can be accurately controlled. .

Further, the dialysate tube section is respectively connected to the dialyzer inlet line and the dialysate supply line through the first three-way solenoid valve, and the waste tube section is respectively connected to the dialyzer through the second three-way solenoid valve Liquid line and waste liquid output line;

Further, the first flow detector on the dialyzer inlet line is connected to the outlet end of the first three-way solenoid valve, and the dialyzer outlet line is located after the second hydraulic pump and the liquid inlet end of the second three-way solenoid valve The common end of the first three-way solenoid valve communicates with the first chamber of the balancer through the dialysate tube section, and the first three-way solenoid valve is connected to the dialysate connector after being connected in series with the first hydraulic pump The common end of the second three-way solenoid valve communicates with the second chamber of the balancer through the waste liquid pipe section, and the liquid discharge end of the second three-way solenoid valve is connected to the waste liquid joint after being connected in series with the second flow detector ;

In the above solution, the first hydraulic pump and the second hydraulic pump act as a power source to respectively drive the flow of the dialysate and the waste liquid. The opening and closing of the first three-way solenoid valve and the second three-way solenoid valve are also divided into two phases for one cycle.

In the first phase, the first three-way solenoid valve is opened (the liquid inlet end is connected to the common end, and the liquid outlet end is connected to the common end). Close), the second three-way solenoid valve is closed (the liquid inlet end is closed to the common end, and the liquid outlet end is turned on to the common end), at which time the first hydraulic pump drives the dialysate from the dialysate joint to the first chamber of the balancer Flowing, moving the diaphragm in the balancer from the first chamber to the second chamber, while causing the waste liquid in the second chamber to flow to the second flow detector and the waste connection, the second flow detection in the process The float in the device is in the upper middle portion of the second flow detector due to the flow of liquid. When the diaphragm is in close contact with the wall of the second chamber, the liquid flow in the second flow detector is stopped, and the float in the second flow detector stops at the bottom of the second flow detector, and the second flow After the sensor in the detector detects the signal of the float, the first three-way solenoid valve and the second three-way solenoid valve execute the second phase through the control circuit.

In the second phase, the first three-way solenoid valve is closed (the liquid inlet end is closed to the common end, the liquid discharge end is turned on to the common end), and the second three-way solenoid valve is opened (the liquid inlet end is connected to the common end, and the liquid is discharged The end to the common end is closed), opposite to the first phase, at which time the second hydraulic pump drives the waste liquid outside the hemodialyzer membrane to flow to the second chamber of the balancer, causing the diaphragm in the balancer to pass from the second chamber Moving the chamber toward the first chamber while flowing the dialysate in the first chamber to the outside of the first flow detector and the hemodialyzer, wherein the float in the first flow detector has a liquid flow, The float is in the upper middle portion of the first flow detector. When the diaphragm is in close contact with the wall of the first chamber, since there is no more liquid flow in the first flow detector, the float in the first flow detector stops at the bottom of the first flow detector, and the first flow rate After the sensor in the detector detects the signal of the float, the first three-way solenoid valve and the second three-way solenoid valve are executed by the control circuit for the next cycle.

Further, the housing of the balancer is composed of two symmetrical cavity pairs, and the two cavities are fixed by bolts; the structure is simplified, and the manufacturing and assembly are facilitated.

Further, the edge of the diaphragm is pressed by the two cavities of the balancer; the diaphragm is securely mounted and the movement is reliable.

The beneficial effects of the invention are:

1. The balancer is used as the capacity balance device, the control is simple, and the manufacturing cost is low;

2. The liquid level detection method is used to monitor whether the diaphragm in the balancer is pushed into place. The manufacturing process and control are simple and easy to implement, and the dialysate can be accurately controlled to enter and exit the hemodialyzer membrane per unit time. The flow of waste liquid.

DRAWINGS

The invention will now be further described in conjunction with the drawings and embodiments.

1 is a schematic structural view of Embodiment 1;

Fig. 2 is a schematic view showing the structure of the embodiment 2.

detailed description

Example 1

1 is a schematic structural view of Embodiment 1, as shown in the figure: The liquid level detecting and balancing device for hemodialysis of the present embodiment includes a balancer flow detector 2, a flow detector and a piping system, and a balancer flow detector 2 flow. The detector comprises a housing and a diaphragm flow detector 3 flow detector, the housing being sealed by a diaphragm flow detector 3 flow detector to form a first chamber flow detector 2a flow detector and a second chamber flow detector 2b flow detector; the tubing system comprises a dialysate line and a waste line, the dialysate line comprising a dialysate for inputting a flow detector that is disconnected from the first chamber flow detector 2a a dialysate supply line and a dialyzer inlet line for communicating with the hemodialyzer dialysate inlet; the waste line includes a flow disconnecting detector that is disconnected from the second chamber flow detector 2b A waste liquid output line for discharging waste liquid and a dialyzer discharge line for communicating with the hemodialyzer waste liquid outlet. The disconnectable communication mode between the dialysate supply line and the dialyzer inlet line and the first chamber flow detector 2a, and the dialyzer discharge line and the waste liquid output line and the second chamber flow detector 2b The disconnection connection mode can adopt various solutions of the prior art, and can be realized by electromagnetic, manual, electric, pneumatic or hydraulic valves, and the communication mode can adopt the main pipe section in and out, or can be connected to each other, and can achieve the object of the invention.

In this embodiment, the dialysate supply line is provided with a first hydraulic pump flow detector 10 flow detector, and the dialyzer inlet line is provided with a first flow detector flow detector 4 flow detector; a dialyzer The liquid discharge line is provided with a second hydraulic pump flow detector 7 flow detector, and the waste liquid output line is provided with a second flow rate. In the embodiment, the first chamber flow rate detector 2a is connected to the flow detector to set the dialysate. Tube festival, The dialysate tube segments are respectively connected to the dialysate liquid supply line and the dialyzer inlet line; the second chamber flow detector 2b flow detector is connected to the waste liquid tube section, and the waste liquid tube section is respectively Connected to the dialyzer outlet line and the waste output line.

As shown in Fig. 1, a balancer 2 is provided outside the hemodialyzer 1, which is composed of two symmetrical cavity pairs, and the two cavities are fixed by bolts. A diaphragm 3 is provided in the balancer 2, the edge of the diaphragm 3 is pressed by the cavity of the balancer 2, and the diaphragm 3 divides the inner cavity of the balancer 2 into a first chamber 2a and a second chamber. 2b. The membrane outer joint of one end of the hemodialyzer 1 is connected to the liquid outlet of the first flow detector 4 through a pipeline, and the liquid inlet of the first flow detector 4 passes through the pipeline and the outlet of the second solenoid valve 5 Connected, the liquid inlet of the second solenoid valve 5 is connected to the first end of the first three-way joint 6 through a pipeline; the membrane outer joint of the other end of the hemodialyzer 1 passes through the pipeline and the liquid inlet end of the second hydraulic pump 7. Connecting, the liquid outlet end of the second hydraulic pump 7 is connected to the liquid inlet end of the third electromagnetic valve 8 through a pipeline, and the liquid outlet end of the third electromagnetic valve 8 is connected to the first end of the second three-way joint 12 through a pipeline. .

As can be seen from Fig. 1, the second end of the first three-way joint 6 communicates with the first chamber 2a of the balancer 2 through a pipe (dialysis liquid pipe section), and the third end of the first three-way joint 6 passes through the pipeline Connected to the liquid outlet end of the first solenoid valve 9, the liquid inlet end of the first solenoid valve 9 is connected to the liquid outlet end of the first hydraulic pump 10 through a pipeline, and the liquid inlet end of the first hydraulic pump 10 is dialysis through the pipeline The liquid joint 11 is connected. The second end of the second three-way joint 12 communicates with the second chamber 2b of the balancer 2 through a pipeline (waste pipe section), and the third end of the second three-way joint 12 passes through the pipeline and the fourth electromagnetic The liquid inlet end of the valve 13 is connected, the liquid outlet end of the fourth solenoid valve 13 is connected to the liquid inlet end of the second flow rate detector 14 through a pipeline, and the liquid outlet end of the second flow rate detector 14 passes through the pipeline and the waste liquid joint. 15 connections.

In this embodiment, the first flow detector 4 and the second flow detector 14 are provided with a float and an inductor, and thus may be called a liquid level detector. The structure and working principle of the flow detector are the same as those in the prior art. Do not repeat them.

The working principle of this embodiment is as follows:

The first electromagnetic valve 9, the second electromagnetic valve 5, the third electromagnetic valve 8 and the fourth electromagnetic valve 13 are alternately opened and closed, and the specific working conditions are: the first electromagnetic valve 9, the second electromagnetic valve 5, and the third electromagnetic valve 8 And fourth solenoid valve 13 The opening and closing are divided into two phases for one cycle.

In the first phase, the first solenoid valve 9 and the fourth solenoid valve 13 are opened, and the second solenoid valve 5 and the third solenoid valve 8 are closed. At this time, the first hydraulic pump 10 drives the dialysate from the dialysate connector 11 to the balancer 2 The first chamber 2a flows, causing the diaphragm 3 in the balancer 2 to move from the first chamber 2a to the second chamber 2b while flowing the waste liquid in the second chamber 2b to the second flow detector. 14 and the waste connector 15, during which the float in the second flow detector 14 is in the upper middle portion of the second flow detector 14 due to the flow of liquid. When the diaphragm 3 is in close contact with the wall of the second chamber 2b, the float in the second flow detector 14 stops at the bottom of the second flow detector 14 because there is no more liquid flow in the second flow detector 14. At this time, after the sensor in the second flow rate detector 14 detects the signal of the float, the first solenoid valve 9, the second solenoid valve 5, the third solenoid valve 8 and the fourth solenoid valve 13 perform the second phase through the control circuit. .

In the second phase, the second solenoid valve 5 and the third solenoid valve 8 are opened, and the first solenoid valve 9 and the fourth solenoid valve 13 are closed, opposite to the first phase, at which time the second hydraulic pump 7 drives the outside of the hemodialyzer membrane. The waste liquid flows to the second chamber 2b of the balancer 2, causing the diaphragm 3 in the balancer 2 to move from the second chamber 2b toward the first chamber 2a while dialysis in the first chamber 2a The liquid flows out of the membranes of the first flow detector 4 and the hemodialyzer 1, in which the float in the first flow rate detector 4 is in the upper middle portion of the first flow rate detector 4 due to the flow of liquid. When the diaphragm 3 is in close contact with the wall of the first chamber 2a, since there is no more liquid flow in the first flow detector 4, the float in the first flow detector 4 stops at the bottom of the first flow detector 4. At this time, after the sensor in the first flow rate detector 4 detects the signal of the float, the first solenoid valve 9, the second solenoid valve 5, the third solenoid valve 8 and the fourth solenoid valve 13 are executed by the control circuit to execute the next one. cycle.

Example 2

As shown in FIG. 2, the liquid level detecting and balancing device for hemodialysis of the present embodiment, the membrane outer joint of one end of the hemodialyzer 1 is connected to the liquid outlet of the first flow rate detector 4 through a pipeline, and the first flow rate detector 4 The liquid inlet is connected to the liquid outlet end of the first three-way solenoid valve 16 through a pipeline; the membrane outer joint of the other end of the hemodialyzer 1 is connected to the liquid inlet of the second hydraulic pump 7 through a pipeline, the second hydraulic pump The liquid outlet of the seventh port is connected to the liquid inlet end of the second three-way solenoid valve 17 through a pipe. The common end of the first three-way solenoid valve 16 is open The pipeline (dialysis fluid pipe section) communicates with the first chamber 2a of the balancer 2, and the liquid inlet end of the first three-way solenoid valve 16 is connected to the liquid outlet of the first hydraulic pump 10 through a pipeline, the first hydraulic pressure The inlet of the pump 10 is connected to the dialysate connector 1 1 via a line. The common end of the second three-way solenoid valve 17 communicates with the second chamber 2b of the balancer 2 through a pipeline (waste pipe section), and the liquid outlet end of the second three-way solenoid valve 17 passes through the pipeline and the second The liquid inlet of the flow detector 14 is connected, and the passage of the second flow detector 14 is connected to the waste connector 15. The rest of the structure of this embodiment is the same as that of Embodiment 1, and details are not described herein.

The working principle of this embodiment is as follows:

The opening and closing of the first three-way solenoid valve 16 and the second three-way solenoid valve 17 are also divided into two phases for one cycle. In the first phase, the first three-way solenoid valve 16 is opened (the liquid inlet end is turned to the common end, the liquid discharge end is closed to the common end), and the second three-way solenoid valve 17 is closed (the liquid inlet end is closed to the common end, The liquid end is turned on to the common end), at which time the first hydraulic pump 10 drives the dialysate to flow from the dialysate joint 11 to the first chamber 2a of the balancer 2, so that the diaphragm 3 in the balancer 2 is moved from the first chamber 2a moves toward the second chamber 2b while flowing the waste liquid in the second chamber 2b to the second flow rate detector 14 and the waste liquid connection 15, in which the float in the second flow rate detector 14 has a liquid flow The float is in the upper middle portion of the second flow detector 14. When the diaphragm 3 is in close contact with the wall of the second chamber 2b, the float in the second flow detector 14 stops at the bottom of the second flow detector 14 because there is no more liquid flow in the second flow detector 14. At this time, after the sensor in the second flow rate detector 14 detects the signal of the float, the first three-way solenoid valve 16 and the second three-way solenoid valve 17 execute the second phase through the control circuit.

In the second phase, the first three-way solenoid valve 16 is closed (the liquid inlet end is closed to the common end, the liquid discharge end is turned on to the common end), and the second three-way solenoid valve 17 is opened (the liquid inlet end is turned on to the common end, The liquid discharge end is closed to the common end), opposite to the first phase, at which time the second hydraulic pump 7 drives the waste liquid outside the hemodialyzer membrane to flow to the second chamber 2b of the balancer 2, so that the balancer 2 The diaphragm 3 moves from the second chamber 2b toward the first chamber 2a while flowing the dialysate in the first chamber 2a to the outside of the first flow detector 4 and the hemodialyzer 1, the first in the process The float in the flow detector 4 is in the upper middle portion of the first flow detector 4 due to the flow of liquid. When the diaphragm 3 is in close contact with the wall of the first chamber 2a, the float in the first flow detector 4 stops at the first flow detector 4 because there is no more liquid flow in the first flow detector 4. At the bottom, after the sensor in the first flow detector 4 detects the signal of the float, the first three-way solenoid valve 16 and the second three-way solenoid valve 17 are again executed by the control circuit for the next cycle.

The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to be limiting, and the present invention will be described in detail with reference to the preferred embodiments. Modifications or equivalents are intended to be included within the scope of the appended claims.

Claims

Claim

A liquid level detecting balance device for hemodialysis, comprising: a balancer (2) and a piping system, the balancer (2) comprising a casing and a diaphragm (3), wherein the casing is provided by a diaphragm (3) The seal partition forms a first chamber (2a) and a second chamber (2b); the tubing system includes a dialysate line and a waste line, the dialysate line including both the first chamber ( 2a) cutting off a dialysate supply line for inputting dialysate and a dialyzer inlet line for communicating with the dialysate inlet of the hemodialyzer; the waste line including both the second chamber (2b) The waste liquid output line for outputting waste liquid and the dialyzer discharge line for communicating with the hemodialyzer waste liquid outlet can be cut off.

The liquid level detecting and balancing device for hemodialysis according to claim 1, wherein: the dialysate supply line is provided with a first hydraulic pump (10), and the dialyzer inlet line is provided with a first Flow detector

(4); The dialyzer outlet line is provided with a second hydraulic pump (7), and the waste liquid output line is provided with a second flow detector (14).

The liquid level detecting and balancing device for hemodialysis according to claim 2, wherein: the first chamber (2a) is connected to a dialysate tube section, and the dialysate tube section is connected to the dialysate respectively. a liquid line and a dialyzer inlet line; the second chamber (2b) is connected to the waste liquid pipe section, and the waste liquid pipe section is respectively connected to the dialyzer discharge line and the waste liquid output line.

The liquid level detecting and balancing device for hemodialysis according to claim 3, wherein: the second electromagnetic valve (5) is connected in series with the first flow rate detector (4) in the dialyzer inlet line And connected to the first end of the first three-way joint (6), the dialyzer outlet line is located in the second hydraulic pump (7) outlet is connected with a third solenoid valve (8) and a second three-way joint ( 12) The first end of the first three-way joint (6) is connected to the first chamber (2a) of the balancer (2) through the dialysate tube section, the first three-way joint (6) The third end of the second solenoid (9) and the first hydraulic pump (10) are connected in series with the dialysate connector (11); the second end of the second tee (12) passes through the waste tube The second chamber (2b) of the balancer (2) is connected, and the third end of the second three-way joint (12) is connected in series with the fourth solenoid valve (13) and the second flow detector (14). The liquid connector (15) is connected.

The liquid level detecting and balancing device for hemodialysis according to claim 3, wherein the dialysate tube section communicates with the dialyzer inlet line and the dialysate through the first three-way solenoid valve (16), respectively. The liquid supply pipe, the waste liquid pipe section is respectively connected to the dialyzer discharge pipe and the waste liquid output pipe through the second three-way solenoid valve (17).

The liquid level detecting and balancing device for hemodialysis according to claim 5, characterized in that: the first flow detector (4) on the dialyzer inlet line and the liquid outlet end of the first three-way solenoid valve (16) Connected, the dialyzer outlet line is connected to the liquid inlet end of the second three-way solenoid valve (17) after the second hydraulic pump (7); the common end of the first three-way solenoid valve (16) passes through the dialysate First chamber of the pipe joint and balancer (2)

(2a) connected, the liquid inlet end of the first three-way solenoid valve (16) is connected in series with the first hydraulic pump (10), and is connected to the dialysate connector (11); the second three-way solenoid valve (17) is shared The end is connected to the second chamber (2b) of the balancer (2) through the waste pipe section, and the second flow valve (14) is connected in series with the second flow detector (14), and the waste liquid joint (15) Connection.

The liquid level detecting and balancing device for hemodialysis according to any one of claims 1 to 6, wherein: the housing of the balancer (2) is composed of two symmetrical cavity pairs, two The cavities are fixed by bolts.

The liquid level detecting balance device for hemodialysis according to claim 7, characterized in that the edge of the diaphragm (3) is pressed by the two cavities of the balancer (2).