JPS6311971Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a blood pressure control device in an artificial kidney device.

FIG. 1 is an explanatory diagram of the configuration of the main parts of a conventional artificial kidney device. The device is a dialyzer
A flow path system including one chamber of a membrane 1, a blood pump 2, an arterial chamber 3, a pressure gauge 4 that measures the pressure in the chamber 3 and outputs a signal _S1 , as shown in FIG. A blood system consisting of a throttle valve (auto-cleaner) 8 that presses a tube 7 with bags 5 and 6 into which compressed air is introduced to adjust the pressure, a venous chamber 9, and a pressure gauge 10 that measures the pressure of the chamber 9. and the other chamber of the membrane of the dialer 1, and includes a dialysate storage tank 11, a liquid feed pump 12, and a pressure gauge 13 that measures the pressure in the flow path and outputs a signal _S2 . Liquid system and signals S ₁ and S ₂
The control system includes an adjustment section 14 that uses the difference between the two as a measured value, performs a predetermined calculation, and outputs a control signal _S3 to the throttle valve 8.

In the blood system, blood from the artery of patient 15 is
Blood pump 2 passes chamber 3 → dialyzer 1 → throttle valve 8 → chamber 9 to patient 1.
It is designed to be returned to the 5th vein. In addition, the dialysate system is configured such that the dialysate in the dialysate storage tank 11 flows in the opposite direction to the blood through the membrane in the dialyzer 1 by a liquid sending pump 12 and is discharged. . On the other hand, in the control system, the difference between the signal of the pressure gauge 4 and the signal of the pressure gauge 13, that is, the difference between the blood pressure of the blood system and the liquid pressure of the dialysate system (which shows an almost constant value), is controlled at a predetermined level. The throttle valve 8 is adjusted so that it falls within the range of .

The pressure control system in such a conventional artificial kidney device requires a compressed air source for the throttle valve 8, resulting in a large device and troublesome maintenance.

The present invention was devised in view of these points, and its purpose is to configure a throttle valve with a motor, transmission mechanism, etc. in order to make it compact and easy to maintain, and to control the operation in the pressure control system. An object of the present invention is to provide a device that performs intermittent operation.

The configuration of the present invention consists of an automatic throttle valve consisting of a mechanism for pressing the flexible tube of the blood system in an artificial kidney device, a transmission mechanism, and a drive motor, and the difference between the pressure signal of the blood system and the pressure signal of the dialysate system. is a measured value and outputs a control signal to the automatic throttle valve, and a set value is given to the calculation unit, and when the difference between the two pressure signals exceeds a predetermined value, the calculation unit is turned on. It consists of a control section.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 3 is an explanatory diagram of the configuration of a pressure control device according to an embodiment of the present invention. In FIG. 3, the same reference numerals as those in FIG. 1 are used with the same meaning, and therefore the description thereof will be omitted here.

16 is a throttle valve, which is shown in Figure 4 A and B (A- in Figure A).
As shown in A sectional view), a stepping motor 18 that rotates forward or reverse depending on the control signal from the adjustment unit 14, a threaded rod 19 integrated with the rotating shaft of the motor 18, and a center The body part has a screw hole 20 into which the threaded rod 19 is screwed, a core 21 whose body is a substantially square prism, a through hole 22 into which the core 21 is inserted loosely, and a base (not shown). An outer cylinder 23 fixed to
and a presser member 24, and the core 21 is displaced to the right by normal rotation of the motor 18, and the tube 7 disposed on the presser member 24 is pressed. 26 is a control unit, dialyzer 1
The adjustment unit 14 is adjusted so that S ₁ −S ₂ (pressure difference between the blood system and the dialysate system) becomes a predetermined value according to the water removal performance of the
(setting signal S ₄ ); when S ₁ - S ₂ exceeds a predetermined value, a function of outputting a signal S ₅ that turns on the operation in the adjustment section 14; and a function of controlling the blood pump 2. It has the function of outputting the signal _S6 .

In such devices, pressure control of the blood system is performed intermittently. That is, as shown in _FIG .
4 is when the pressure difference between the blood system and the dialysate system is a predetermined value.
The control operation is performed until it stabilizes at P ₁ (corresponding to the setting signal S ₄ ) (time T ₁ ), and then it is turned off (time
_T2 ). When the pressure difference exceeds a predetermined value P ₀ in the off state, the adjustment section 14 is turned on again by the signal S ₅ from the control section 26 and performs a control operation (time T ₃ ). Therefore, the above pressure difference is set to a predetermined value.
P kept within ₀ .

In the above control operation, the automatic throttle valve core 21
Since the rotational movement of the tube 7 is restricted by the outer cylinder 23, the tube 7 is displaced in the left and right direction in response to the forward or reverse rotation of the stepping motor 18, that is, the rotation of the threaded rod 19. Adjust the strength of the pressure,
It also regulates the pressure of the blood system.

In addition, in the above embodiment, the adjustment section and the control section are
Although the configuration is different, the present invention is not limited to this, and may be configured with an electronics circuit centered on a computer.

Further, the configuration of the automatic throttle valve does not need to be limited to the above-mentioned embodiment. For example, the core and the outer cylinder may be connected by a spline structure, and the core may be displaced left and right by a motor.

As described above, the pressure control device of the present invention is equipped with an automatic throttle valve configured to displace the core using a transmission mechanism, a motor, etc., and is configured to operate intermittently in the pressure control system. It's summery. Therefore, the device is small and easy to maintain. Furthermore, since the automatic throttle valve is operated intermittently, wear on the transmission device and the like is reduced, resulting in a long service life.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the configuration of a conventional artificial kidney device;
FIG. 2 is an explanatory diagram of the configuration of a conventional throttle valve, FIG. 3 is an explanatory diagram of the configuration of a pressure control device according to an embodiment of the present invention, and FIG. 4 is an explanatory diagram of the configuration of an automatic throttle valve according to an embodiment of the present invention. FIG. 5 is an explanatory diagram of the operation of the pressure control device according to the embodiment of the present invention. 1... dialyzer, 2... blood pump, 3...
... Arterial side chamber, 4, 10 and 13 ... Pressure gauge, 7 ... Flexible tube, 11 ... Dialysate reservoir, 12 ... Liquid pump, 14 ... Adjustment section, 16
...Automatic throttle valve.

Claims (1)

[Scope of utility model registration request] A device that controls the pressure in the blood system of an artificial kidney device using a throttle valve includes a stepping motor that rotates forward or reverse depending on a control signal, a threaded rod integrated with the rotating shaft of the motor, and the threaded rod. It consists of a core having a threaded hole in the center, an outer cylinder having a through hole into which the core is loosely inserted and fixed to a base, and a holding member. an automatic throttle valve that displaces the blood system to press and control the flexible tube of the blood system disposed on the holding member, and uses the difference between the blood system pressure signal and the dialysate system pressure signal as a measurement value. an adjustment section that outputs the control signal to the ping motor; and a set value P ₁ is given to the adjustment section, and when the difference between the two pressure signals exceeds a certain value △P ₀ that is smaller than the set value P ₁ ; a control section that turns on the regulation section, and the regulation section is turned on by a signal from the control section until the difference between the pressure of the blood system and the pressure of the dialysate system stabilizes at the set value _P1 . controlling the pressure of the blood system, and then turning off the regulator;
When the pressure difference exceeds the predetermined value ΔP ₀ in the OFF state, the adjustment section is turned on again by a signal from the control section and controls the pressure of the blood system, thereby increasing the pressure of the blood system. A blood pressure control device in an artificial kidney device characterized by intermittent pressure control.