CN106581792B - Device for realizing flow balance control by using flow balance type peristaltic pump - Google Patents

Abstract

The invention relates to a flow-balanced peristaltic pump for blood purification, comprising a base, an upper cover, a first pump tube, a second pump tube, a pump head, two balance cavities and a diaphragm; The upper cover is rotatably installed on the base, the inside of the base is provided with a pump head groove, the pump head arranged along the longitudinal direction is placed in the pump head groove, and the upper cover is provided with a pump head cover for covering the pump head, The first pump tube and the second pump tube are placed in the base along the lateral direction, and a part of the first pump tube and a part of the second pump tube are both pressed on the circumferential side of the pump head, and both sides of the pump head are provided with A limit piece that restricts the movement of the first pump tube and the second pump tube, the balance cavity is provided with a diaphragm that divides the balance cavity into a first cavity and a second cavity, and the first pump tube communicates with the first cavity, The second pump tube communicates with the second cavity, and the two balance cavities are located on two sides of the pump head. The balanced peristaltic pump has a flow balance function and belongs to the technical field of blood purification.

Description

A device for realizing flow balance control using flow balance peristaltic pump

technical field

The present invention relates to the technical field of blood purification, in particular to a flow-balanced peristaltic pump for blood purification.

Background technique

Blood purification technologies include hemodialysis, filtration, adsorption, plasma exchange, etc., among which hemodialysis is the most common application. An important task of blood purification is the precise removal of excess water from the patient's body, known as ultrafiltration. Technically, the realization of ultrafiltration is accomplished by controlling the flow of two-way liquid, and the control of two-way flow is realized in two parts, that is, the structure of "balanced system + ultrafiltration pump". The patent application No. 200610054252.8 describes a volume balance and ultrafiltration device for blood purification; the patent application No. 201210403479.4 describes a balancing pump, and the patent application No. 201210403480.7 describes a continuous flow balancing device; some of their common The characteristics are: 1. It is installed in the water circuit structure inside the complex hemodialysis equipment; 2. It requires huge and complex mechanical and electrical components; 3. It is only suitable for flowing through the dialysate but not human blood; 4. The pipeline is not One-time use, need to be sterilized and cleaned after each use.

The pump body that is suitable for flowing human blood, has a simple structure and can be used for one time, the most common is the roller type (or roller type) peristaltic pump, which is used in almost all blood purification equipment, but the function of these peristaltic pumps is only to provide Power, but can not achieve flow balance, all kinds of continuous blood purification equipment (CRRT) only use ordinary peristaltic pumps, and its liquid balance control can only be achieved through electronic scales or measuring bags, electronic weighing methods take up a lot of space, use demanding.

SUMMARY OF THE INVENTION

In view of the deficiencies existing in the prior art, the first object of the present invention is to provide a flow-balanced peristaltic pump for blood purification, which has a flow-balanced function and can establish the requirements for ultrafiltration. flow balancing system.

The second object of the present invention is to provide a device for realizing flow balance control using a balanced peristaltic pump, which can be used for dialysate flow balance and blood flow balance.

The third object of the present invention is to provide a device for realizing flow balance control by using a balanced peristaltic pump, which can achieve the therapeutic effect of controlling the total amount of liquid without an electronic scale during hemodiafiltration treatment.

In order to achieve the above object, the present invention adopts the following technical solutions:

A flow-balanced peristaltic pump for blood purification, comprising a base, an upper cover, a first pump tube, a second pump tube, a pump head, and two balance cavities; the upper cover covered on the base is rotatably installed On the base, a pump head groove is arranged inside the base, the pump head arranged along the lateral direction is placed in the pump head groove, the upper cover is provided with a pump head cover for covering the pump head, the first pump tube and The second pump tube is placed in the base along the longitudinal direction, and a part of the first pump tube and a part of the second pump tube are both pressed on the circumferential side of the pump head. A limit piece that moves with the second pump tube, two balance chambers are arranged on the first pump tube and the second pump tube, and each balance chamber is provided with a balance chamber that divides the balance chamber into a first cavity and a second For the diaphragm of the cavity, the first pump tube communicates with the first cavity, the second pump tube communicates with the second cavity, and the two balance cavities are located on both sides of the pump head.

Further, there are 4 rollers evenly arranged in the circumferential direction in the pump head. When the pump head rotates, the rollers roll the pump tube in sequence, drive the liquid in the pump tube to flow forward, and ensure that at least one roller presses the pump tube at any time to prevent the liquid from flowing back.

Further, the base is provided with a balance cavity clamping slot, and the balance cavity is placed in the balance cavity clamping slot. It makes the balance cavity not easy to shake.

Further: the base is provided with a pipeline slot for placing the first pipeline where the first pump tube is located and the second pipeline where the second pump tube is located, and one end of the pipeline slot is connected to the pump head slot , the other end of the pipeline clamping slot is located at the end of the base; the upper cover is provided with a notch slot which is adapted to the pipeline clamping slot. The notched groove prevents the top cover from compressing the first and second pump tubes when the top cover covers the base. The pipeline clamping groove is used to fix the first pipeline and the second pipeline, so that the first pipeline and the second pipeline are not easy to shake.

Further, a positioning column is arranged on the upper cover, a positioning hole is arranged at a corresponding position of the base, and a position switch is arranged at the positioning hole. It can ensure that the upper cover and the base are accurately matched, and ensure that the base and the components in the upper cover are accurately matched together. When the two positioning columns of the upper cover are located in the two positioning holes of the base, the position switch action can be triggered, and it can be detected whether the upper cover is fully closed.

Further, the upper cover is provided with a lock post, and the base is provided with a lock. When the upper cover is placed on the base, the lock catches on the lock post, so as to fasten the upper cover and the base together.

Further, the lock includes an integrally formed rotating rod and a bending rod, the rotating rod is rotatably mounted on the base, and the bending rod is provided with a notch which is buckled on the locking rod. The lock post and the lock are simple in structure and easy to use.

Further, the pump head cover is provided with a cover groove, and the cross-sectional shape of the cover groove is arc-shaped; the axis corresponding to the cover groove and the axis corresponding to the pump head are on the same straight line. When the upper cover is placed on the base, under the combined action of the pump head groove and the cover groove, the pump head can only rotate, but cannot be displaced in the lateral direction, and the driving force obtained by the liquid in the two pump pipes is equal, which is the first An important condition for achieving flow balance between the first pump tube and the second pump tube.

A device for realizing flow balance control using a peristaltic pump, comprising a balanced peristaltic pump, a dialyzer, a replacement fluid bag, a first pressurizing pump, an ultrafiltration pump, a second pressurizing pump, a first pressure monitor and a second pressure Monitor; one end of the first pump tube of the peristaltic pump is connected to the replacement fluid bag through the pipeline, the other end of the first pump tube of the peristaltic pump is connected to the dialyzer through the pipeline, and one end of the second pump tube of the peristaltic pump is connected through the pipeline Connected with the dialyzer, the other end of the second pump tube of the peristaltic pump discharges waste liquid through the pipeline; the first pressurized pump is arranged on the pipeline between the replacement fluid bag and the first pump tube, and the second pressurized pump is arranged on the On the pipeline between the dialyzer and the second pump tube, the ultrafiltration pump is set on the pipeline between the dialyzer and the second pressurizing pump, and the first pressure monitor is set between the first pressurizing pump and the first pump tube. The second pressure monitor is arranged on the pipe between the second pressurizing pump and the second pump pipe. The device can be used for hemodialysis (HD), and a balanced peristaltic pump can create a balance system for the flow of dialysate or replacement fluid needed to achieve ultrafiltration.

A device for realizing flow balance control by using a peristaltic pump, including a balanced peristaltic pump, a blood filter, a replacement fluid bag, a pre-dilution booster pump, a first booster pump, an ultrafiltration pump, a second booster pump, and a first booster pump. A pressure monitor and a second pressure monitor; one end of the first pump tube of the peristaltic pump introduces blood through the pipeline, the other end of the first pump tube of the peristaltic pump is connected to the blood filter through the pipeline, and the second pump of the peristaltic pump is connected to the blood filter through the pipeline. One end of the tube is connected with the blood filter through the pipeline, and the other end of the second pump tube of the peristaltic pump discharges blood through the pipeline; On the pipe between the filter and the second pump pipe, the first pressure monitor is arranged on the pipe between the first pressurized pump and the first pump pipe, and the second pressure monitor is provided on the second pressurized pump and the first pump pipe. On the pipeline between the second pump tubes; one end of the ultrafiltration pump is connected to the pipeline between the first pressure monitor and the first pressurizing pump, and the other end of the ultrafiltration pump is connected between the first pump tube and the blood filter The replacement fluid bag is connected to the pipeline between the blood filter and the first pump tube through the replacement fluid pipeline, and the pre-dilution and pressure pump is arranged on the replacement fluid pipeline.

In general, the present invention has the following advantages:

1. The balanced peristaltic pump provided by the present invention can be installed on the surface of the equipment that is easy to operate, and can be used in both the dialysate circuit and the human blood circuit. It has a flow balancing function, is easy to use, and the pipeline can be used at one time. , does not require cleaning.

2. A special feature of the present invention is to adopt two identical pump tubes, and the size and material of the first pump tube and the second pump tube are exactly the same; the two-way liquid of the present invention is driven by the rollers of the same peristaltic pump, Using the same two pump tubes, the material, inner diameter, outer diameter and wall thickness of the pump tubes are the same, so as to ensure that the liquid flow rates of the two paths are basically the same.

3. Another special feature of the present invention is the left and right balance chambers connected with the two pump tubes. The liquid flow rate depends not only on the rotational speed of the pump head, but also has a great relationship with the pressure on the left and right sides of the pump tube. The middle of the cavity is separated by an elastic soft diaphragm, and the two sides are symmetrical structures, which are connected to a pump tube respectively. The diaphragm has good elasticity and can move back and forth. Transfer pressure to keep the pressure of the two liquids equal. When the pressure on one side is higher than the other side, the elastic soft diaphragm will move to the low pressure side, and finally the pressures on both sides of the diaphragm are equal; when the pump head rotates, the two liquids flow at the same time.

4. A device for realizing flow balance control by using a peristaltic pump, because the pressure adjustment of the diaphragm in the balance chamber is not infinitely adjustable, and the actual size of the diaphragm limits its adjustment range is limited, so when the pressure monitor detects that the pressure is too low, add The pressure pump can appropriately increase the flow of the liquid to ensure that the diaphragm in the balance chamber is always near the middle and not the limit.

5. The first pipeline and the second pipeline of the present invention can be simply installed on the base, and the entire peristaltic pump can be installed on the surface of the equipment that is easy to operate, which can be used in both the dialysate circuit and the human blood circuit. , At the same time, it has the function of flow balance, which is easy to use, and the pipeline can be used once without cleaning.

Description of drawings

Fig. 1 is the structural representation of the peristaltic pump of the present invention.

Figure 2 is a schematic diagram of the structure of the pump head cover on the pump head.

FIG. 3 is a schematic structural diagram of the first pipeline and the second pipeline.

FIG. 4 is a schematic diagram of the principle of the device of the present invention.

FIG. 5 is a schematic diagram of the principle of the device for realizing the balance control of blood flow according to the present invention.

Among them, 1 is the base, 2 is the upper cover, 3 is the pump head, 4 is the pump head cover, 5 is the cover groove, 6 is the roller of the pump head, 7 is the limit piece, and 8 is the inlet balance cavity card slot , 9 is the outlet balance cavity slot, 10 is the pipeline slot, 11 is the shaft, 12 is the notch slot, 13 is the lock post, 14 is the lock, 15 is the positioning hole, 16 is the positioning column, 17 is the The first position switch, 18 is the second position switch, 19 is the balance chamber at the inlet end, 20 is the balance chamber at the outlet end, 21 is the diaphragm, 22 is the first cavity of the balance chamber at the inlet end, and 23 is the balance at the outlet end The first cavity of the cavity, 24 is the second cavity of the inlet balance cavity, 25 is the second cavity of the outlet balance cavity, 26 is the first pipeline, 27 is the second pipeline, 28 is the second cavity The first pump tube, 29 is the second pump tube, 30 is the pump head groove, 31 is the pump head shaft, 32 is the replacement fluid bag, 33 is the dialyzer, 34 is the first pressurizing pump, and 35 is the second pressurizing pump , 36 is the first pressure monitor, 37 is the second pressure monitor, 38 is the ultrafiltration pump, 39 is the hemofilter, 40 is the pre-dilution booster pump, 41 is the replacement fluid pipeline, and 42 is the introduction pipeline.

Detailed ways

The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

For the convenience of description, the following directions are specified as follows: the direction of liquid flow is the longitudinal direction, that is, the direction in which the first pump pipe and the second pump pipe are laid, and the longitudinal direction refers to the left and right direction; the direction of the pump head is The horizontal direction refers to the front-to-rear direction.

A flow-balanced peristaltic pump for blood purification, comprising a base, an upper cover, a first pump tube, a second pump tube, a pump head, and two balance cavities. The upper cover covering the base is rotatably installed on the base, the upper cover is rotatably installed on the base through a rotating shaft, and the opening method of the upper cover and the base is flip type, the structure is simple, and the opening method is convenient. There is a pump head groove inside the base, and the pump head arranged along the longitudinal direction is placed in the pump head groove, and an arc groove (pump head groove) can be dug in the middle position inside the base. The shape is adapted to the pump head, so that the pump head can rotate in the arc groove; the pump head is provided with a roller and a pump head rotating shaft, and the roller in the pump head makes a circular motion to drive the liquid flow in the pump tube; the pump head is provided with 4 rollers, when the pump head rotates, the rollers roll the pump tube in sequence, drive the liquid in the pump tube to flow forward, and ensure that at least one roller presses the pump tube at any time to prevent the liquid from flowing back. The pump head belongs to the existing mature technology. The upper cover is provided with a pump head cover for covering the pump head, the pump head cover is provided with a cover groove, and the cross-sectional shape of the cover groove is arc-shaped. Under the combined action, the pump head can only rotate, but cannot be displaced in the lateral direction, so as to ensure the normal operation of the peristaltic pump, which is an important condition for the first pump tube and the second pump tube to achieve flow balance. The first pump tube and the second pump tube are placed in the base along the longitudinal direction, the first pump tube and the second pump tube are parallel to each other, and a part of the first pump tube and a part of the second pump tube are both pressed against the pump head. On the side of the circumference, that is, first place the pump head in the pump head groove, and then lay the first pump pipe and the second pump pipe. The pump head should have sufficient length to ensure that part of the first pump pipe and the second pump pipe Part of it is against the circumferential side of the pump head. Both sides of the pump head (both sides in the lateral direction) are provided with limit pieces for restricting the movement of the first pump tube and the second pump tube, that is, there are two limit pieces, one limit piece is located behind the pump head, and the other limit piece is located at the back of the pump head. A limit piece is located at the front of the pump head. The limit piece can ensure that the first pump tube and the second pump tube will not slide out of the pump head, which is an important condition to ensure that the pump head can always drive the liquid flow. The two balance chambers are both arranged on the first pump tube and the second pump tube. The balance chamber is provided with a diaphragm that divides the balance chamber into a first cavity and a second cavity. The first pump tube is connected to the first cavity. The cavities are communicated, the second pump tube communicates with the second cavity, and the two balance chambers are located on two sides of the pump head, that is, one balance chamber is located on the left side of the pump head, and the other balance chamber is located on the right side of the pump head. The two balancing cavities are the inlet balancing cavity and the outlet balancing cavity respectively. The inlet balancing cavity is divided into a first cavity and a second cavity, and the outlet balancing cavity is also divided into a first cavity and a second cavity. cavity. The first cavity, the first pump tube of the inlet balance cavity, the first cavity of the outlet balance cavity and their corresponding pipes constitute the first pipeline; the second cavity and the second cavity of the inlet balance cavity The pump tube, the second cavity of the balance cavity at the outlet end and their corresponding pipelines constitute the second pipeline.

A balance cavity card slot is arranged in the base, and the balance chamber body is placed in the balance cavity card slot. The balance cavity card slot includes an inlet end balance chamber body card slot and an outlet end balance chamber body card slot, and the inlet end balance chamber body and the outlet end balance chamber body are placed in the corresponding balance chamber body card slots. It makes the balance cavity not easy to shake.

The base is provided with a pipeline slot for placing the first pipeline and the second pipeline, one end of the pipeline slot is connected to the pump head slot, and the other end of the pipeline slot is located at the end of the base; There are two sections of road card slot, one pipeline slot is located on the left side of the pump head, and the other pipeline slot is located on the right side of the pump head; the inlet balance cavity slot is located on the left pipeline slot, and the outlet balance cavity is located on the left pipeline slot. The body clip is located on the right pipeline clip. The first pump tube and the second pump tube will not be shaken, and the smooth circulation of the liquid is ensured. The upper cover is provided with a notch slot which is adapted to the pipeline clamping slot, so as to prevent the upper cover from pressing the first pipeline and the second pipeline when the upper cover covers the base.

The upper cover is provided with positioning posts, and the corresponding positions of the base are provided with positioning holes. There are two positioning columns and two positioning holes, the two positioning holes are located on the left and right sides of the front end of the base, and a position switch is arranged at the positioning holes. The position switch at the left positioning hole is the first position switch, and the position switch at the right positioning hole is the second position switch. When the two positioning columns of the upper cover are located in the two positioning holes of the base, the position switch action can be triggered, and it can be detected whether the upper cover is fully closed. If the cover is not fully closed, the pump head cannot work; about If the upper cover is not intact and the position switch is activated, the control pump head will be prohibited from working. This control technology belongs to the existing mature technology, and this control technology is not the focus of the present invention.

The upper cover is provided with a lock post, and the base is provided with a lock. When the upper cover is placed on the base, the lock catches on the lock post, so as to fasten the upper cover and the base together. The locking buckle includes an integrally formed rotating rod and a bending rod, the rotating rod is rotatably mounted on the base, and the bending rod is provided with a notch which is buckled on the locking rod. The lock post and the lock are simple in structure and easy to use.

The principle of the present invention to achieve flow balance is mainly: two paths of blood liquid flow into the first pump tube and the second pump tube respectively, and since the two paths of liquid pass through the same structure, the two paths of blood flow in the first pump tube and the second pump tube. flow balance.

The invention has the following advantages: 1. It can be installed on the surface of the blood purification equipment for easy operation (traditional balancing technology is installed inside the equipment, with a fixed structure). 2. Simple structure (traditional balance chamber requires two containers, two diaphragms, four cavities, and 8 solenoid valves), easy to use (ordinary peristaltic pump rollers and shells have a fixed structure and spacing, and the installation of the pump tube needs to be plugged in and used Rotating the pump head by hand is easy to pinch the hand; the present invention adopts the flip cover to rotate, and the cover lock can be closed). 3. It can be used in both the dialysate circuit and the human blood circuit (traditional balancing technology cannot be used for the balancing of flowing blood due to repeated use and cross-infection caused by the use of different patients). 4. It has triple flow balancing function (one is two pipes with the same pump; two is the same pressure in two channels; three is the linkage between the first booster pump and the second booster pump). 5. The pump tube can be used for one-time use and does not need to be disinfected and cleaned after each use (traditional balancing technology is a fixed internal pipeline system, repeated use requires each cleaning and disinfection, and cross-infection may occur in different patients).

A kind of application example of peristaltic pump of the present invention is introduced below:

A device for realizing flow balance control by using a peristaltic pump, comprising a dialyzer, a replacement fluid bag, a first pressurizing pump, an ultrafiltration pump, and a second pressurizing pump; The bag is connected, the other end of the first pump tube of the peristaltic pump is connected to the dialyzer through the pipeline, one end of the second pump tube of the peristaltic pump is connected to the dialyzer through the pipeline, and the other end of the second pump tube of the peristaltic pump is connected to the dialyzer through the pipeline. The waste liquid is discharged from the pipeline, the first pressurizing pump is set on the pipeline between the replacement fluid bag and the first pump tube, the second pressurizing pump is set on the pipeline between the dialyzer and the second pump tube, and the ultrafiltration pump is set On the tubing between the dialyzer and the second pressurized pump. The device also includes a first pressure monitor and a second pressure monitor, the first pressure monitor is set on the pipeline between the first pressurizing pump and the first pump pipe, and the second pressure monitor is set on the second pressurizing pump on the pipe between the pump and the second pump tube. The device can be used to realize flow balance control of dialysate or replacement fluid.

The fresh dialysate flows out from the replacement fluid bag, and then flows to the first pump tube (the dialysate sequentially passes through the first cavity of the balance chamber at the inlet end, the first pump tube, and the first cavity of the balance chamber at the outlet end), and the dialysate is dialyzed. After the liquid flows out from the first pump tube, it flows to the dialyzer, and then flows out from the other end of the dialyzer (the dialysate flowing out has become waste liquid at this time), and the waste liquid flows to the second pump tube (the waste liquid passes through the inlet end in turn The second cavity of the balance cavity, the second pump tube, and the second cavity of the balance cavity at the outlet end), after the waste liquid flows out of the second pump tube, the waste liquid is discharged through the pipeline.

The first pressure monitor can monitor the pressure of the liquid in the first cavity of the inlet balance cavity, the second pressure monitor can monitor the pressure of the liquid in the second cavity of the inlet balance cavity; the first pressurizing pump can The flow in the first pipeline is adjusted to realize speed regulation and pressure, and similarly, the second pressure pump can adjust the flow in the second pipeline to achieve speed regulation and pressure. When the pressure difference between the first cavity of the inlet balance cavity and the second cavity of the inlet balance cavity is too large, which exceeds the ability of the balance cavity diaphragm to adjust the pressure, the first pressure pump and the second The booster pump can adjust the flow rate in the first pump tube and the second pump tube respectively according to the situation to ensure the pressure balance in the first cavity and the second cavity of the inlet balance cavity, and then realize the first pump tube and the second pump tube. The balance of the flow of the two pump tubes. The balanced peristaltic pump can realize the balance of the flow in the first pump tube and the second pump tube, so that the flow of the dialysate entering the peristaltic pump is consistent with the flow of the waste liquid discharged from the peristaltic pump. When there is excess water in the patient's body, the excess water in the patient can only be discharged from the ultrafiltration pump. Therefore, on the basis of this balanced system established by the balanced peristaltic pump, the volume of the liquid pumped by the ultrafiltration pump is exactly equal to The total amount of ultrafiltration required by the patient.

The dialyzer mainly uses the principle of semi-permeable membrane to introduce the patient's blood and dialysate into the dialyzer at the same time. The blood and dialysate flow in opposite directions on both sides of the dialysis membrane. Gradient to achieve the removal of toxins and excess water retention in the body, while replenishing the substances needed in the body.

The following introduces the application example of the balanced peristaltic pump of the present invention for blood flow balance:

Some of the pipelines are named for the convenience of introduction. In this application example, there is a pipeline for introducing blood, which is called the introduction pipeline; there is a pipeline for introducing replacement fluid, which is called the replacement fluid pipeline. A device for realizing flow balance control by using a peristaltic pump, including a balanced peristaltic pump, a blood filter, a replacement fluid bag, a pre-dilution booster pump, a first booster pump, an ultrafiltration pump, a second booster pump, and a first booster pump. A pressure monitor and a second pressure monitor. One end of the first pump tube of the peristaltic pump introduces blood through the pipeline, the other end of the first pump tube of the peristaltic pump is connected to the blood filter through the pipeline, and one end of the second pump tube of the peristaltic pump is connected to the blood filter through the pipeline. , the other end of the second pump tube of the peristaltic pump discharges blood through the tube. The first pressurizing pump is provided on the pipe for introducing blood (ie, the introduction pipe), and the second pressurizing pump is provided on the pipe between the hemofilter and the second pump tube. The first pressure monitor is set on the pipeline between the first pressurizing pump and the first pump pipe, that is, the first pressure monitor is set on the introduction pipeline, and the first pressure monitor should be close to the first part of the inlet balance cavity. cavity. The second pressure monitor is arranged on the pipeline between the second pressurizing pump and the second pump pipe, and the second pressure monitor should be close to the second cavity of the inlet balance cavity. One end of the ultrafiltration pump is connected to the pipeline (introduction pipeline) between the first pressure monitor and the first pressurizing pump, and the other end of the ultrafiltration pump is connected to the pipeline between the first pump tube and the blood filter; replacement The liquid bag is connected to the pipeline between the blood filter and the first pump tube through the replacement fluid pipeline, and the pre-dilution and pressure pump is arranged on the replacement fluid pipeline.

The device can realize the control of blood flow balance and can be used for hemodiafiltration (HDF), and the balanced peristaltic pump can establish a blood balance system, realize the balance of replacement fluid and the required ultrafiltration control, without the need for electronic scales.

The blood of the patient's arterial end is connected to the first pump tube of the peristaltic pump through the introduction tube, and the first pressurizing pump sucks the blood to the first cavity of the balance chamber at the inlet end, and then flows through the first pump tube and the outlet end The first cavity of the balancing chamber is then merged with the replacement fluid flowing out of the replacement fluid bag (the replacement fluid is fed through the replacement fluid tube), and enters the hemofilter together; the blood filtered by the hemofilter is filtered by the second The pressurizing pump pumps into the second cavity of the balance chamber at the inlet end, then flows through the second pump tube and the second cavity of the balance chamber at the outlet end, and returns to the patient's vein end. Due to the balancing effect of the balanced peristaltic pump, the total amount of blood flowing out and inflowing from the patient is guaranteed to be balanced. On the basis of establishing this balance system, if the patient needs proper ultrafiltration, a certain amount of blood will be pumped by the ultrafiltration pump after the first pressurized pump. Type peristaltic pump, that is, bypassing the first pipeline and directly reaching the pipeline between the first cavity of the balance chamber at the outlet and the hemofilter, then the volume of blood flowing through the ultrafiltration pump is exactly equal to the patient's need for ultrafiltration. total amount of filtration.

The first pressure monitor can monitor the pressure of the liquid in the first cavity of the inlet balance cavity, the second pressure monitor can monitor the pressure of the liquid in the second cavity of the inlet balance cavity; the first pressurizing pump can The flow in the first pipeline is adjusted to realize speed regulation and pressure, and similarly, the second pressure pump can adjust the flow in the second pipeline to achieve speed regulation and pressure. When the pressure difference between the first cavity and the second cavity of the balance cavity at the inlet end is too large and exceeds the ability of the balance cavity diaphragm to adjust the pressure, the first booster pump and the second booster pump can adjust the pressure according to the situation. The flow in the first pump tube and the second pump tube is adjusted respectively to ensure the pressure balance in the first cavity and the second cavity of the inlet balance cavity, thereby realizing the flow balance of the first pump tube and the second pump tube. The peristaltic pump can achieve the balance of the flow in the first pump tube and the second pump tube, so that the total amount of the patient's blood flowing out of the body and entering the peristaltic pump and the total amount of the patient's blood flowing out of the peristaltic pump and returning to the body after being filtered by the hemofilter is consistent. When there is excess water in the patient's body, ultrafiltration can be achieved by the ultrafiltration pump. Since a certain amount of blood is pumped into the ultrafiltration pump after the first pressurized pump, the total amount of blood flowing out of the patient's body will be more than the total amount flowing in. The volume of blood flowed by the ultrafiltration pump is precisely equal to the total amount of ultrafiltration required by the patient.

The above-mentioned embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the above-mentioned embodiments, and any other changes, modifications, substitutions, combinations, The simplification should be equivalent replacement manners, which are all included in the protection scope of the present invention.

Claims (8)

1. a device utilizing flow balance type peristaltic pump to realize flow balance control, peristaltic pump is used for blood purification, it is characterized in that: peristaltic pump comprises base, upper cover, first pump tube, second pump tube, pump head, Two balance chambers; the upper cover covered on the base is rotatably installed on the base, the interior of the base is provided with a pump head groove, the pump head arranged along the lateral direction is placed in the pump head groove, and the upper cover is provided with a pump head groove. There is a pump head cover for covering the pump head, the first pump tube and the second pump tube are placed in the base along the longitudinal direction, and a part of the first pump tube and a part of the second pump tube are both pressed against the pump head. On the circumferential side, both sides of the pump head are provided with limit pieces for restricting the movement of the first pump tube and the second pump tube. The cavity is provided with a diaphragm that divides the balance cavity into a first cavity and a second cavity, the first pump tube communicates with the first cavity, the second pump tube communicates with the second cavity, and the two balance cavities are separated Both sides of the pump head; The device includes a balanced peristaltic pump, a hemofilter, a replacement fluid bag, a pre-dilution booster pump, a first booster pump, an ultrafiltration pump, a second booster pump, a first pressure monitor and a second pressure monitor; One end of the first pump tube of the peristaltic pump introduces blood through the pipeline, the other end of the first pump tube of the peristaltic pump is connected to the blood filter through the pipeline, and one end of the second pump tube of the peristaltic pump is connected to the blood filter through the pipeline. , the other end of the second pump tube of the peristaltic pump discharges blood through the pipeline; the first pressure pump is arranged on the pipeline for introducing blood, and the second pressure pump is arranged between the blood filter and the second pump tube. On the pipeline, the first pressure monitor is arranged on the pipeline between the first pressure pump and the first pump pipe, and the second pressure monitor is arranged on the pipeline between the second pressure pump and the second pump pipe; One end of the filter pump is connected to the pipeline between the first pressure monitor and the first pressurizing pump, and the other end of the ultrafiltration pump is connected to the pipeline between the first pump tube and the blood filter; the replacement fluid bag is passed through the replacement fluid The pipeline is connected to the pipeline between the blood filter and the first pump tube, and the pre-dilution and pressure pump is arranged on the replacement fluid pipeline. 2. A device for realizing flow balance control using a flow-balanced peristaltic pump according to claim 1, wherein the pump head is provided with 4 rollers evenly arranged along the circumferential direction. 3. A device for realizing flow balance control by utilizing a flow-balanced peristaltic pump according to claim 1, wherein the base is provided with a balance cavity slot, and the balance cavity is placed in the balance cavity slot . 4. a kind of device that utilizes flow balance type peristaltic pump to realize flow balance control according to claim 2, it is characterized in that: be provided with the first pipeline and the second pump tube where the first pump tube is placed in the base In the pipeline slot of the second pipeline where it is located, one end of the pipeline slot is connected to the pump head slot, and the other end of the pipeline slot is located at the end of the base; Fits notched grooves. 5. A device for realizing flow balance control using a flow-balanced peristaltic pump according to claim 1, characterized in that: the upper cover is provided with a positioning column, and a positioning hole is provided on the corresponding position of the base; With position switch. 6 . The device for realizing flow balance control by using a flow-balanced peristaltic pump according to claim 1 , wherein the upper cover is provided with a lock post, and the base is provided with a lock. 7 . 7. A device for realizing flow balance control using a flow-balanced peristaltic pump according to claim 6, wherein the lock comprises an integrally formed rotating rod and a bending rod, and the rotating rod is rotatably mounted on the base The bending rod is provided with a notch which is fastened on the locking post. 8. according to a kind of device that utilizes flow balance type peristaltic pump to realize flow balance control according to claim 1, it is characterized in that: a cover groove is provided on the pump head cover, and the cross-sectional shape of the cover groove is arc-shaped; The axis of the pump head and the corresponding axis of the pump head are on the same line.

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