JP3061457U - Fluid pump for artificial kidney - Google Patents

Abstract

(57) [Summary] [Problem] In dialysis treatment for removing waste matter in blood by osmotic pressure or ultrafiltration pressure through a dialysis membrane, simple and accurate supply of replacement fluid and equal replacement and removal of replacement fluid are performed. Provided is an artificial kidney replacement fluid pump that can be executed accurately. A replacement fluid supply device in a dialysis treatment for removing waste products in blood by an osmotic pressure or an ultrafiltration pressure through a dialysis membrane, comprising two syringes A and B having the same capacity. Pumps, each of which is provided with driving means for alternately repeating an equal amount of suction and discharge in conjunction with each other, and opening and closing the flow path between the fluid replacement circuit 6 and the drainage circuit 3 in synchronization with the suction and discharge operations The valves a, b, c, and d are provided to alternately switch between the two, and supply and removal of a specified amount of replacement fluid are performed by suction and discharge operations by continuous operation of two syringe pumps.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention provides a replacement fluid pump for an artificial kidney for supplying replacement fluid and performing an equal replacement and removal of water in an electrodialysis treatment in which waste matter in blood is removed by osmotic pressure or ultrafiltration pressure through a dialysis membrane. It is about.

[0002]

[Prior art]

 In dialysis therapy, the dialysis treatment has been diversified with the increase in the water removal capacity of the dialysate, and HDF therapy combining conventional hemodialysis (HD) and hemofiltration (HF) has become widespread. . HF or HDF therapy is a method of removing a large amount of water in the blood and supplementing the removed water with replacement fluid. Accuracy and precision are required to control the balance between the amount of removed water and the replacement fluid. Control methods include a volume control method using a fixed-quantity chamber and a weight control method using a roller pump and a load cell.These control methods are used in combination with a device that integrates the functions of a dialysis device and an existing dialysis device. However, there are problems such as a complicated structure, maintenance of the device, and an expensive use circuit.

[0003]

[Problems to be solved by the invention]

 The present invention has been made in view of the above circumstances, and provides simple and accurate replacement fluid supply and the like in dialysis treatment for removing waste products in blood by osmotic pressure or ultrafiltration pressure through a dialysis membrane. An object of the present invention is to provide a rehydration pump for an artificial kidney, which can accurately perform rehydration and removal of water in an amount.

[0004]

[Means for Solving the Problems]

 To achieve the above object, the artificial kidney rehydration pump of the present invention provides a replacement fluid supply device in a dialysis treatment for removing waste matter in blood by osmotic pressure or ultrafiltration pressure through a dialysis membrane. It has two syringe pumps composed of two syringes of the same capacity, each of which is provided with a drive means which alternately repeats suction and discharge of an equal amount in conjunction with each other, and in synchronization with the suction and discharge operations A valve is provided for alternately switching between opening and closing the flow path between the fluid replacement circuit and the drainage circuit, so that a specified amount of replacement fluid is supplied and water is removed by suction and discharge operations by continuous operation of the two syringe pumps. It was done.

[0005] Furthermore, a replenishing bag holding portion is provided at the upper portion of the apparatus provided with the dual syringe pump and the valve, and if necessary, the refilling bag is heated to an appropriate temperature while being held in the holding portion. It is good also as a structure provided with the conduction heating means.

In addition, the syringe has a thin and flexible space between the syringe outer cylinder side flange and the reciprocating inner cylinder side flange in order to prevent bacteria from entering the infusate due to the reciprocating operation of the inner cylinder. The structure may be such that the interior of the syringe is not contaminated by falling bacteria in the air and contact with the membrane by covering it with a certain membrane.

[0007] Furthermore, the dual syringe pump, the valve, the holding portion for the replacement fluid bag, the heating means for the replacement fluid bag, and the presence or absence of air and fluid in the tube circuit detect that the fluid replacement bag is empty. It is desirable that a sensor and a control unit for detecting the occurrence of the failure be integrated with each other, and that the base be provided with casters for movement and installation to a clinical site.

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a flow chart of the implementation of the present invention. In this figure, a drainage circuit 3 is connected to a dialysate circuit 2 connected to a dialyzer 1, and a valve a and a valve b are provided in the middle of the drainage circuit 3. A syringe A is connected between these valves a and b.

A rehydration circuit 6 from a rehydration bag 5 is connected to the blood circuit 4 of the dialyzer 1, and a valve c and a valve d are provided in the rehydration circuit 6. A syringe B is connected between these valves a and b.

The syringe A and the syringe B having the same capacity are linked with each other. When one of the syringes performs a suction operation, the other performs a discharge operation, and switches between the suction and discharge flow paths of each syringe. , C, d.

That is, as shown in FIG. 1, when the syringe A performs a suction operation, the valve a is opened and the valve b is closed, and the dialysis fluid circuit 2 enters the syringe A via the drainage circuit 3. Aspirate the waste liquid. At this time, when the valve c on the syringe B side is closed and the valve d is opened, the replacement fluid in the syringe B can be delivered to the blood circuit 4 by performing the discharging operation of the syringe B.

When the suction of the syringe A and the discharge of the syringe B are completed as described above, the state of each valve is switched, the syringe A performs a discharge operation, drains the dialysate, and the syringe B performs a suction operation. Then, the replacement fluid is sucked into the syringe B from the replacement fluid bag 5.

According to the present invention, the two syringes A and B having the same volume are used as suction and discharge pumps, so that the specified replacement fluid and the same replacement fluid and the same amount of water can be continuously removed. I try to control it.

The switching of the flow paths during the suction and discharge operations of the syringes A and B is non-returned in the tube circuit as shown in FIG. 2 instead of the valves a, b, c and d. By providing the valves 8, 8,..., It is also possible to continuously control the replacement fluid volume and the equal replacement fluid volume and the water removal volume specified by alternate suction and discharge operations of the syringe A and the syringe B in the same manner as described above. It is.

A specific embodiment of the artificial kidney rehydration pump according to the present invention will be described below. As shown in FIG. 3 (a), the entire structure is provided with a caster 9 for movement. A base 10, a housing 13 provided with a double syringe pump unit 11 and a valve unit 12, a heating unit 14 for holding and heating the replacement fluid bag 5, a control unit 15, and a replacement fluid empty detector 7 is provided.

To describe each part in detail, in FIG. 3B, an upper front surface of a housing 13 provided with the syringe pump unit 11 and the valve unit 12 is provided with a gradient in consideration of usability, and a syringe pump unit is provided. The valve unit 11 and the valve unit 12 are covered with a cover 19 made of a transparent resin that can be opened and closed. The cover 19 can be easily removed from the housing 13 during wiping, disinfection, maintenance, and the like, and can be held and held by cover hinges 20 provided on both lower sides of the front surface of the housing 13. Like that. When mounting the syringes A and B and the circuit tube T, the cover 19 can be opened by sliding the cover 19 downward.

In order to protect the operator from inadvertently coming into contact with the movable parts during driving and not causing harm, a safety device is provided so that the device does not enter the operating state when the cover 19 is not closed. ing.

As shown in FIGS. 3A and 3B, moving handles 18 are provided on both sides of the housing 13 to hold the apparatus when the apparatus is moved, and also serve as protection guards for the apparatus from obstacles. ing. It can also be used to prevent the tube connected to the replacement fluid bag 5 from being disturbed.

On the left and right of the heating unit 14, there are provided heating plates 14 a, 14 a provided with gradients, and on the left and right of the heating unit 14, a plurality of bag hooks 21 for holding the rehydration bag 5. , 21... Are provided. The surface of each heating plate 14a is controlled to an appropriate temperature by an electric heater 14b provided inside. The rehydration bag 5 is hung on the bag hook 21 so as to be in contact with the surface of the heating plate 14a of the heating unit 14, and is heated by conduction heat from the heating plate 14a.

In FIG. 3B, the internal structure of the refill empty detector 7 provided at the rear of the housing 13 is such that ultrasonic waves are applied so as to sandwich the circuit tube T from the refill bag 5 as shown in FIG. The transmitter 22a and the receiver 22b are incorporated, and the difference in the transmission rate of the ultrasonic wave depending on the presence or absence of air in the circuit tube T indicates that the fluid replacement bag 5 is empty and the air in the bag 5 flows into the circuit. Is detected.

In FIG. 3A, the syringe pump unit 11 is provided with holders 23 for mounting the outer cylinders 34 of the syringe A and the syringe B in a parallel state, and the outer cylinders of the respective syringes A and B are provided. As shown in FIG. 6, a sucker receiver 28 having a receiving portion 28a for holding a flange portion 30a provided at an end of the inner cylinder 30 of each of the syringes A and B is provided. I have.

As shown in FIG. 6 (this figure shows the syringe pump unit 11 in the horizontal direction in FIG. 10, it is actually provided substantially in the vertical direction), a bracket 24 is provided inside the housing 13. A ball screw 26 to which a ball nut 25 is mounted is provided rotatably on the bracket 24 in the up-down direction (the left-right direction in FIG. 6). The inner cylinder 30 of the syringes A and B is moved up and down by driving the suction receiver 28 upward and downward through the ball nut 25 and the connection plate 27 by the rotation of the ball screw 26. It moves in the direction. As shown in FIG. 3A, a vertical hole 29 for guiding the connecting plate 27 in the vertical direction is formed in the front surface of the housing 13 in parallel.

A feed gear 35 is provided at an end of the ball screw 26. As shown in FIG. 5, in order to move the inner cylinders 30 of the syringe A and the syringe B by an equal amount, gears having the same diameter and the same number are arranged in parallel at a distance. A pair of left and right intermediate gears 36 mesh with each other between 35 and 35, and a driving gear 37 meshes with one of them.

The driving gear 37 is connected to a stepping motor 38 as shown in FIG. When the stepping motor 38 rotates forward, the ball screw 26 of the syringe A rotates forward, and the syringe A operates in the discharge direction via the ball nut 25, the connecting plate 34, and the suction receiver 28. At the same time, the ball screw 26 on the syringe B side is reversed, and the syringe B operates in the suction direction.

As a means for transmitting the power, a toothed belt may be used to connect the feed gear 35 and the driving gear 37.

The above-described stepping motor 38 rotates in synchronization with an electric pulse of a set liquid amount, and rotates by the number of pulses corresponding to one stroke of the syringes A and B. I just try to reverse. By repeating this operation, the syringes A and B can send the set infusion amount (total amount).

As shown in FIG. 5, the stepping motor 38 is attached to the body of the bracket 24, is held in a balanced manner by springs 39, 39 free of rotation, and is bent or blocked by the circuit tube T. When an overload occurs, the stepping motor 38 rotates in the direction opposite to the rotational operation direction of the stepping motor 38, and this movement is detected by the sensor 40 as shown in FIG. 39a is a holding member for holding the spring 39.

As shown in FIG. 7 and FIG. 8, the valve unit 12 has four valves a, b, c, and d incorporated in a valve holding member 12b, and the valve holding member 12b is opened in a lateral direction. A mounting groove 12a is formed, and below the mounting groove 12a, a valve a (or b, c, or d) fixed to an upper end of a clamp shaft 43 described later is provided. a presses the inside of the mounting groove 12a to close and open the circuit tube T.

These valves a, b, c and d are driven by a rotary solenoid 41 as shown in FIG. When the rotary solenoid 41 is energized, the rotary solenoid 41 rotates and the clamp shaft 43 connected by the link plate 42 having the eccentric mechanism connected to the rotary solenoid 41 is lowered, and the valve a (or b, c, d) is opened. When the power is turned off, the valve is raised by the force of the clamp spring 44 and the valve is closed.

With such a valve unit 12, the circuit tube T is closed or opened when the suction and discharge operations of the two syringe pump units 11 are switched, and the liquid flow path is switched.

In addition, by changing the operation of the dual syringe pump unit 11 and the switching timing of the four valves a, b, c, d, the mounting failure of the circuit tube T to the valves a, b, c, d is caused. It is possible to detect a leak, a leak of the connected circuit tube T, and an open / close failure of the tube T of the valve itself. For example, as shown in FIG. 1, when one of the syringe pumps B is in the discharge state and the two valves c and d on the syringe B side are closed, the syringe pump is overloaded and the syringe pump unit 11 The sensor 40 can confirm and detect that the valves c and d are normally closed.

Further, whether the valve is operating according to the valve opening / closing control signal can be detected by the opening / closing detection switch 45.

The syringes A and B used in the present invention are composed of an outer cylinder 34 and an inner cylinder 30 as shown in FIG. When the syringes A and B repeat suction and discharge, the inner cylinder 30 slides, and there is a possibility that bacteria may enter the infusate from the sliding surface 46. As a countermeasure, in the present embodiment, the space between the flange 34a of the outer cylinder 34 and the flange 30a of the inner cylinder 30 is covered with a thin film 47 to seal the inside. It is configured so that it cannot be touched.

The thin film 47 is formed of a flexible rubber or the like, and is deformed in accordance with the operation of the inner cylinder 30, so that the outside air is separated from the sliding surface 46 of the inner cylinder 30. The sliding can be repeated while maintaining the above, and the invasion of bacteria from the sliding surface 46 can be prevented.

[0035]

[Effect of the invention]

 As explained above, according to the renal replacement pump for an artificial kidney of the present invention, there are provided two syringe pumps each composed of two syringes having the same capacity, and each of the pumps operates in conjunction with suction and discharge of an equal amount. And a valve that alternately opens and closes the flow path between the rehydration circuit and the drainage circuit in synchronization with the suction and discharge operations. Therefore, suction by continuous operation of the two syringe pumps is provided. With a simple pump configuration that performs a discharge operation and a discharge operation, it is possible to supply a specified amount of replacement fluid and remove water with high precision.

[0036] Further, a configuration is provided in which a holding section for a rehydration bag is provided at the upper part of the apparatus, and conduction heating means for heating the rehydration bag to an appropriate temperature in a state where the rehydration bag is held in the holding section as necessary is used. It becomes possible to supply the replenisher which has been prepared.

The syringe used in the syringe pump of the present invention has a thickness between the syringe outer cylinder side flange and the reciprocating inner cylinder side flange in order to prevent bacteria from entering the infusate due to the reciprocating operation of the inner cylinder. The closed structure covered with a thin flexible membrane makes it possible to prevent the inside of the syringe from being contaminated by falling bacteria and contact in the air.

Further, in the present apparatus, a dual syringe pump, a valve, a holding portion for a replacement fluid bag, a heating means for the replacement fluid bag, and the presence or absence of air and fluid in the circuit tube to detect the fluid replacement bag. By integrating the sensor that detects the emptying and the control unit with the caster on its base, it is easy to move and install to the clinical site.

[Brief description of the drawings]

FIG. 1 is a diagram showing an implementation flowchart of the present invention.

FIG. 2 is a flowchart showing another embodiment of the present invention;

FIG. 3 (a) is a front view showing the entire device of the present invention,
(b) is a side view.

FIG. 4 is a partial cross-sectional view of the replacement fluid empty detector according to the embodiment of the present invention.

FIG. 5 is an end view of the dual syringe pump unit according to the embodiment of the present invention;

FIG. 6 is an internal structural view of the dual syringe pump unit according to the embodiment of the present invention.

FIG. 7 is a front view of the valve unit according to the embodiment of the present invention.

FIG. 8 is an internal structural view of a rotary solenoid for driving a valve unit according to an embodiment of the present invention.

FIG. 9 is an internal structural view of the syringe in the embodiment of the present invention.

[Explanation of symbols]

A, B: syringe, a, b, c, d: valve, 1: dialyzer, 2: dialysate circuit, 3: drainage circuit, 4: blood circuit, 5
... Refilling fluid bag, 6 ... Refilling fluid circuit, 7 ... Refilling fluid empty detector, 9 ...
Casters, 10 base, 11 syringe pump unit, 12 valve unit, 13 housing, 14 heating unit, 14a heating plate, 14b electric heater, 15 heater
Control unit, 19: cover, 21: bag hook, 24
... Bracket, 25 ... Ball nut, 26 ... Ball screw, 27 ... Connecting plate, 28 ... Suction receiver, 29 ... Vertical hole, 30
... inner cylinder, 3a ... inner cylinder collar, 34 ... outer cylinder, 34a ... outer cylinder collar, 35 ... feed gear, 36 ... intermediate gear, 37 ...
Drive gear, 38 stepping motor, 40 sensor, 41 rotating solenoid, 42 link plate, 43 clamp shaft, 45 open / close detection switch, 46 sliding surface, 4
7 ... Thin film

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tomoyuki Wada 9 Asami Medical Co., Ltd., 9-1 Kanda-Midshiro-cho, Chiyoda-ku, Tokyo

Claims (4)

[Utility model registration claims] An apparatus for supplying a replacement fluid in a dialysis treatment for removing waste matter in blood by osmotic pressure or ultrafiltration pressure through a dialysis membrane, comprising a double syringe pump comprising two syringes of the same volume. Each pump is provided with a drive unit that alternately repeats suction and discharge of an equal amount in conjunction with each other, and alternately switches between opening and closing the flow path between the replacement fluid circuit and the drainage circuit in synchronization with the suction and discharge operations. A rehydration pump for an artificial kidney, comprising a valve, wherein a supply and removal of a specified amount of replacement fluid are performed by suction and discharge operations by continuous operation of the two syringe pumps. 2. A replenishing bag holding portion is provided at an upper portion of the apparatus provided with the dual syringe pump and the valve, and if necessary, the refilling bag is heated to an appropriate temperature while being held in the holding portion. The fluid replacement pump for an artificial kidney according to claim 1, further comprising a conduction heating means. 3. The syringe has a thin and flexible space between the syringe outer cylinder side flange and the reciprocating inner cylinder side flange to prevent bacteria from being mixed into the infusate due to the reciprocating operation of the inner cylinder. The rehydration pump for an artificial kidney according to claim 1, wherein the syringe is covered with a membrane so that the inside of the syringe is not contaminated by falling bacteria and contact in the air. 4. The refilling bag is emptied by detecting the presence of air and liquid in the tube circuit, wherein the dual syringe pump, the valve, the refilling bag holding portion, the heating means for the refilling bag, and the presence or absence of air and liquid in the tube circuit are detected. 2. A rehydration pump for an artificial kidney according to claim 1, wherein a sensor and a control unit for detecting the occurrence of the failure are integrally formed, and a caster for movement and installation to a clinical site is provided on the base. .