JPS58177669A - Blood recovery apparatus of blood treating device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blood collection device for collecting blood into a human body by replacing blood remaining in a blood processor with air.

Blood processing devices include dialysis-type artificial kidneys, V-type artificial kidneys,
Artificial lungs, artificial livers, plasma separators, etc. are now in practical use.
In both cases, blood is taken from a patient, processed through blood processing equipment such as purification, and the processed blood is returned to the patient.When the processing is completed, the blood processing equipment and blood processing are returned to the patient. It is necessary to perform a blood collection operation to return blood remaining in the so-called extracorporeal circulation circuit, such as a blood tube connected to the patient, into the patient.

For example, during dialysis in the artificial blue range, the tri residual blood is 10
Since the patient's hematopoietic function is already in a state of decline, it is desirable to return the remaining blood effectively. Conventionally, when returning such residual blood, there is a method of sending air into an extracorporeal circulation circuit and replacing the blood in the extracorporeal circuit with air. In this case, it is dangerous if air is accidentally pumped into the body. Therefore, it is necessary to collect as much of the remaining blood as possible in a dangerous state where air is pumped into the body. Conventionally, staff members monitor the flow of air flowing through the extracorporeal circulation circuit while completing blood collection. υ, the staff member required a great deal of concentration and was a heavy burden.

An object of the present invention is to provide a blood collection device that collects blood by replacing blood in an extracorporeal OIK fishing circuit with air, in which the end of the collection can be reliably and automatically detected.

According to the present invention, a means is provided for detecting the liquid level in the drip chamber provided at the outlet hook of the blood processing device, and when the liquid level falls below a predetermined value, a command to complete the collection of remaining blood is issued. That is, the drip chamber temporarily stores the blood discharged from the blood processor and collects small air bubbles mixed in the blood. Therefore, blood above a certain level always accumulates in this drip chamber. When blood is collected by replacing air with air, most of the replacement is completed, the blood in the drip blood processor is pushed out, and the air passes through the blood processor and reaches the drip chamber. When the level of blood decreases and this decrease reaches a predetermined value, it is determined that air for replacement has reached the drip chamber, and based on this determination, a command to complete the collection is issued. Since the collection completion command is automatically detected in this way, it is possible to detect the completion more reliably and correctly than in the case where a staff member monitors the air flow condition to detect the completion.
Furthermore, the staff member does not need to monitor the collection with great concentration, and the staff can be notified of the completion of the collection by automatically stopping the operation or by using an alarm.

Next, an embodiment of the blood collection device according to the present invention will be described with reference to the drawings. In FIG. 1, a needle is inserted into the artery of a patient 11, a blood pipe 12 is connected to the needle, and the blood pipe 12 is connected to a drip chamber 13. A roller pump 14 is provided on the blood pipe 12 , and the rotation of the roller pump 14 draws out blood from the patient 11 and supplies it to the drip chamber 13 . In the drip chamber 13, air bubbles mixed in the blood are removed. The blood that has passed through the drip chamber 13 is supplied to a blood processor 15, such as a dialyzer.

The blood processed by the blood processor 15 is supplied to another drip chamber 16 and the air is removed again.

Blood leaving the drip chamber 16 is returned through the needle to the patient's 11 vein through the blood pipe 17. Blood pipe 12, drip chamber 13, blood processing device 15, drip chamber 16, blood pipe 17 are so-called extracorporeal m
m circuit 18 is configured.

Pump 14 and patient 11 @ blood test 12
A clamp 19 is provided as a means for controlling on/off the flow of blood inside the blood pipe 17 of the patient 111! Similarly, a second pump 21 is provided at I for controlling the flow on and off. A bubble detector 22 is provided on the drip chamber 16 side of the clamp 21 to detect air bubbles when they are present in the blood flowing through the blood pipe 17. For example, the bubble detector 22 is a photoelectric detector and is connected to the blood pipe 17. If air bubbles are mixed in the blood flowing through the blood, the air bubble detector 22 detects the air bubbles and the clamp 21 is immediately closed.

When collecting blood, the needle on the artery side inserted into the patient 11 is removed and, as shown by the dotted line, a saline bottle 2 is inserted into the patient 11.
3 to supply the physiological saline to the blood pipe 12. In order to supply air during recovery, a branch pipe 24 is provided which branches off from the blood pipe 12 and is open at one end, and a clamp 25 is provided on the branch pipe 24.

At the beginning of the blood 1111 collection operation, the clamp 19 is set to Kva as shown in FIG. 2A, and the clamp 21 is set to the second position.
- as shown in Figure B, and the clamp 2 of the branch pipe 24.
5 is closed as shown in the second diagram, and the pump 14 is 1 Jg.
As shown in FIG. 2E, the drive starts from time t1. Therefore, the physiological saline in the saline bottle 23 is supplied to the blood processor 15 through the pipe 12, and the blood inside is pushed out and returned to the patient 11 through the blood pipe 17. The supply of physiological saline in the human body increases with time as shown in FIG. When the same amount of saline is supplied, this is detected at that point and the operation moves on to replace the liquid in the extracorporeal mm circuit 18 with air.

That is, from a certain point in time, the clamp 19 is closed as shown in FIG. 2A, and the clamp 25 is opened as shown in the second diagram. For this purpose, air is sucked into the blood pipe 12 through the branch pipe 24 and sent to the blood processing device 15, thereby sending the mixture of blood and physiological saline inside the blood pipe to the human body 11. According to the present invention, the replacement with air is completed by detecting the liquid level in the drip chamber 16 provided on the outlet side of the mori blood processor 15.

That is, for example, as shown in FIG.
The treated blood from the blood processor 15 is dripped into the upper end of the drip chamber 16 through the pipe 26, and the blood 27 is constantly accumulated in the drip chamber 16. A mesh 28 is lined around the bottom inner circumferential surface of the drip chamber 16. This prevents small air bubbles contained in the blood from passing through, and the air bubbles gather, grow thicker, rise, and escape into the upper space 29 of the drip chamber 16. If necessary, the clamp 32 of the air pipe 31 in the space 29 can be opened to release the air pipe 31 to the outside. The blood that has passed through the MEC L28 of the drip chamber 16 is sent to the pipe 17.

In a normal blood processing state, the liquid level of the blood 27 fluctuates somewhat, but remains constant. However, air is sent to the drip chamber 1 during the blood collection operation.
6, the liquid level in the chamber 16 drops considerably from the normal level L1 and reaches zero, but when the liquid level falls to a predetermined level, for example, level Ll. This is detected by the level detector 33.

This level detection can be done, for example, by a photoelectric detector or by
Attach a permanent magnet to the float floating in chamber 16.
When the liquid level has decreased to Ll is detected by means of a switch provided externally to detect the permanent magnet. Note that the depth of the chamber 16 is, for example, 10
aw level, space 29 is 2 to 3 aw in blood processing state
There is a degree of depth.

When the 1°k surface detector 33 detects that the liquid level has fallen below a predetermined value, this is detected by the control circuit 34 in FIG.
The control circuit 34 issues a recovery end command. In this example, as shown in FIG. 2H, the surface detector 3
3 detects that the liquid level has fallen below a predetermined level at time ta, the clamp 21 is closed as shown in Figure E of wJ2, and the drive of the pump 14 is stopped as shown in Figure 2E. In this manner, according to the present invention, it is detected that the liquid level in the drip chamber 16 has fallen below a predetermined value, and the end of the replacement of the liquid in the extracorporeal circulation circuit 18 with air by air is detected. Upon detection, a command to complete blood collection is issued. Since the end of the air replacement is detected before the bubble detector 22, even if the level detector 33 should fail, the bubble detector 22 will still operate, ensuring sufficient reliability.

In FIG. 1, for example, the pressure inside the drip chamber 13 is detected by an arterial pressure detector 35, and the detected pressure is supplied to a control circuit 34. By controlling the ring 36 and thereby closing the vibrator, the arterial pressure increases as shown in FIG. leaked out,
By repeating closing the clamp 36 again when the arterial pressure reaches the lower limit set value, the blood pumped into the blood processing device can be rapidly sped up or slowed down. In order to effectively remove adhering blood, physiological saline is supplied from time t1 in FIG. 37, these pulses are counted by a counter 38, and when this reaches a set value of 8 times, the output is given to the control circuit 34, which closes the clamp 19 and closes the clamp 2.
5 can be opened and replaced with air. In order to supply a predetermined amount of saline in this manner, a flow meter may be provided in the pipe 12 separately from the pump 14, or the supply amount may be detected from changes in the liquid level in the saline bottle 23. You can.

In the above, the air supply operation was started immediately after the specified amount of physiological saline had been supplied, but before that, as shown in Figure 1, the subcirculation circuit including the blood processor 15 was constructed. For example, the pipe 12 between the pump 14 and the clamp 19 and the pipe 17 between the bubble detector 22 and the drip chamber 16 are connected by a wired path 39, a clamp 41 is provided in the side path 39, and the clamp 41 is opened. , clamp 1
By closing 9°21.25, narrow path 3
9, pipe 12, drip chamber 13, blood processing device 1
5. A sub-circulation circuit 42 including the drip chamber 16, the pipe 17, and the side passage 39 is configured, and the sub-circulation circuit 42 is brought into a circulating state immediately after time tm in FIG. vI mixed solution with physiological saline! If
After that, the second pump of the printing circuit 42 may be stopped and the clamp 25 may be opened in the same manner as before to supply air to the extracorporeal circulation path 18.

[Brief explanation of the drawing]

FIG. WJ1 is a configuration diagram showing an example of the blood collection device according to the present invention, FIG. 2 is a time chart for explaining its operation, and FIG. 3 is a sectional view showing an example of the drip chamber 16. 11: patient, 12.17: blood pipe, 13° 16: drip chamber, 14: pump, 15; blood processing association, 1
8 external circulation circuit, 19, 21. 25, 36, 41: clamp, 23: saline bottle, 24: branch pipe for air supply, 33: liquid level detector, 34: control circuit. Patent applicant: Asahi Medical Co., Ltd. Agent Takuo Kusano 2 Figure 8' 3

Claims (1)

[Claims] (1) In a blood collection device that completes the collection of residual blood in an extracorporeal differential circuit in which a drip chamber I (a drip chamber I) is inserted into an outlet hook of a blood processing device by replacing it with air, A blood collection device for a blood processing device, comprising means for detecting that the liquid level has fallen below a predetermined value, and means for issuing a command to terminate the remaining blood upon detection.