JPH01232970A - Artificial dialyzer - Google Patents

Abstract

PURPOSE:To perform the change-over operation of an operating condition by automatically detecting the start of artificial dialysis, by arranging a concn. detection means for a dialysing fluid to a dialysing fluid passage after the passage through a dialyzer and detecting a change in concn. by said concn. detection means to change over and display the operation condition of the dialyzer. CONSTITUTION:When a dialysing fluid is changed by the solute in blood after the start of dialysis, this state is detected by a concn. detection means 5 to emit a signal for changing over and displaying the operating condition of a dialyzer 4. At the start point of time of dialysis, dialysis is usually performed by setting ultrafiltration pressure to 0 but the solute in blood is diffused to the dialysing fluid because of the difference between the concn. of the dialysing fluid and that of blood and the concn. of the dialysing fluid rises and the sonic velocity of an ultrasonic wave also rises. These changes reach a steady state 1 2 min after blood begins to flow to the dialyzer 3 and the detection thereof is easy. By this method, the operation from priming to the finish of dialysis can be fully automated and an operator can be intent on the treatment of a patient without being obstructed by the operation of machine.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention detects the start of dialysis by changes in the dialysate caused by blood solutes in artificial dialysis, and automatically adjusts the operating conditions of the device. This invention relates to an artificial dialysis device that can be switched to

[Conventional technology]

Before performing artificial dialysis, priming is performed, that is, a process of flowing physiological saline into the dialyzer and blood circuit for the purpose of removing and cleaning air bubbles. After this priming is complete, a needle is inserted into the patient's blood vessel for extracorporeal circulation of blood (
Artificial dialysis) is started, but conventionally the timing of this start has not been automatically detected.

[Problem to be solved by the invention]

In recent years, automation of priming and programming control of ultrafiltration rate and dialysate concentration have been implemented in dialysis machines, but the switching from priming to dialysis is performed manually based on the judgment of the operator. ing.

However, the beginning of dialysis is the most complicated time for patient care, places a heavy burden on the operator, and is prone to erroneous operations.

Furthermore, since the alarm device does not turn on during priming, it will be dangerous for the patient if the operating mode is not reliably set.

Furthermore, in a device that automatically controls the amount of ultrafiltration,
Although it is essential to accurately know when to start dialysis, this judgment is left to the operator and is not always appropriate.

The present invention has been made in view of the above points, and it is possible to automatically detect the start of artificial dialysis and perform operations such as switching operating conditions, thereby reducing the burden on the operator and making it safe and reliable. The purpose of the present invention is to provide an artificial dialysis device that enables highly efficient artificial dialysis.

(Means for Solving the Problems) The present invention provides a dialysate concentration detection means □ in the dialysate flow path that has passed through the dialyzer in an artificial dialysis machine.
is equipped with a concentration detection means such as an ultrasonic ultrafiltration rate measuring device (for example, Japanese Patent Publication No. 62-204763) capable of detecting concentration, and based on a predetermined concentration detection signal from this concentration detection means, the operating conditions of the device can be determined. This makes it possible to perform switching automatically.

[For production]

After the start of dialysis, when the dialysate changes due to solutes in the blood, the concentration detection means detects this state and issues a signal for switching or displaying the operating conditions of the dialysis apparatus.

At the beginning of dialysis, the ultrafiltration pressure is usually set to 0, but since the concentrations of the dialysate and blood are different, solutes in the blood diffuse into the dialysate, and as the concentration of the dialysate increases, the ultrasonic wave The speed of sound also increases. This change reaches a steady state within 1 to 2 minutes after blood starts flowing through the dialyzer, and is easy to detect.

When using an ultrasonic ultrafiltration rate measuring device, the detected concentration is the average concentration at the inlet and outlet sides of the dialyzer, so the start of dialysis can be detected without adding any extra equipment. It is very useful.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

In the figure, 1 indicates a patient's arm, 2 a blood pump, 3 a dialyzer, 4 a dialyzer, 5 a concentration detection means, 6 a dialysate discharge side, and 7 a dialysate supply side.

As the concentration detector Vjt5, a concentration detector or an ultrasonic ultrafiltration rate measuring device capable of detecting the concentration is used, and is installed on the dialysate discharge side 6. When the blood pump 2 is rotated to start dialysis, blood from the patient begins to flow into the dialyzer 3, and the solutes in the blood flow through the dialysis membrane of the dialyzer 3 into the dialysate discharge side 6, causing a concentration change. will occur. The concentration detection means 5 detects the change and switches the operating state of the dialysis apparatus 4. This means switching from priming mode to normal dialysis mode, activating the alarm system, controlling ultrafiltration rate and concentration, as well as blood flow rate and dialysate, if necessary, according to pre-programming instructions. Controls flow rate, etc.

〔Effect of the invention〕

The present invention, as described above, is capable of automatically and reliably detecting the start of dialysis, reduces the burden on the operator, improves safety, and improves the measurement accuracy of ultrafiltration rate.
This will contribute to more advanced automation in the future, making it possible to fully automate everything from priming to the end of dialysis operation, which will have the effect of allowing operators to focus on patient treatment without having to worry about operating the machine. be.

Furthermore, it is particularly useful to carry out the present invention using an ultrasonic type ultrafiltration rate measuring device, since there is no increase in cost at all.

[Brief explanation of the drawing]

The drawings are schematic illustrations of embodiments of the invention. Explanation of symbols 1-m-patient's arm 2-blood pump 3-dialyzer 4--dialysis device 5-concentration detection means
6- Dialysate discharge side 7- Dialysate supply side Patent applicant Mishima Work Co., Ltd.

Claims (1)

[Claims] A dialysate concentration detection means is installed in the dialysate flow path after passing through the dialyzer, and the concentration detection means detects a change in concentration, thereby switching and/or displaying the operating conditions of the dialyzer. Artificial dialysis equipment.