JPH01145568A - Sampling mechanism of blood gas analyzing apparatus - Google Patents

Abstract

PURPOSE:To improve reliability by providing a mechanism operating so that a washing port is pushed incessantly to a sample injection port at a prescribed speed when a flap is closed. CONSTITUTION:When a flap 1 is put in a state of closure, a slide shaft 40 is moved in the direction D. The air sealed up in a case 50 is designed to be pressed out little by little from an air exhaust hole 55 by a slide 54, on the occasion. This hole 55 is made to have a diameter of about 0.5mm so that the slide shaft 40 moves at a certain low speed. When the movement in the direction D is completed, all the air is exhausted from the hole 55. Consequently, only a pressing force of a spring 51 is left behind, and thus sealing of a washing port 3 to a bush 5 can be implemented under a prescribed pressure.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a sampling mechanism of a blood gas analyzer,
In particular, the present invention relates to a sampling mechanism suitable for completely cleaning the surface of the injection port without splattering of blood when the cleaning port seals the injection port.

[Conventional technology]

Figure 5 shows the sampling device of a conventional blood gas analyzer.
This will be explained using FIG.

FIG. 6 is a measurement flow path diagram in which blood collected with a syringe 15 is directly inserted into the injection port 6 with the flap 1 opened and the electromagnetic valve 13 open, and the components and concentration in the blood are analyzed in the measuring section 1o. be.

FIG. 5 shows a state diagram in which the flap 1 is closed and the measuring section 10 and the injection port 6 are cleaned after the analysis is completed. Cleaning operation is done by solenoid valve 13
is closed, and the squeezing pump 12 is rotated to suck up the cleaning liquid 16 and wash away the blood inside the flow path of the measuring section 10 and the injection port 6.

Next, the details will be explained with reference to FIG. The flap 1 can be opened and closed around the rotating shaft 7, and the spring 8 works when it is closed.
It acts in the direction of pushing the cleaning port 3 towards the bush 5. A cleaning port 3 is attached to the mounting plate 2 of the flump 1, and a spring 4 is incorporated in the flanges 1 so as to be able to swing freely. and,
A tube 9 for introducing a cleaning liquid is connected to the cleaning port 3.

A bushing 5 is attached to the injection port 6 to improve the sealing performance of the cleaning port 3. Although configured as described above, the force of the spring 8 that presses the conventional flap 1 is approximately 60 mm in the state shown in FIG. 7 in order to improve the sealing of the sample injection port 6.
It is about 0g.

However, since the point that fixes the spring 8 is an arc,
The spring force when the spring 8 is most compressed is about 1 kg.

Since the opening and closing of the flap 1 is a manual operation by the person handling the device, if the spring 8 is released in a direction that closes slightly compared to when the spring 8 is contracted to the minimum, the speed at which the spring 8 tries to extend will be the same as that of the flap 1. The closing speed of An adverse effect in this case is that the blood adhering to the surface of the bush 5 when blood is injected is scattered due to the shock when the cleaning port 3 seals.

In the prior art, the sealing performance of the cleaning port 3 is ensured, but no consideration is given to blood scattering during such sealing, resulting in problems of poor cleaning and contamination. In addition, regardless of the measurement, it is possible to inadvertently
There was also the problem that if the device was opened, it would not detect whether the device was opened or closed, leading to malfunction of the device.

[Problem that the invention seeks to solve]

The above-mentioned conventional technology does not take into consideration the impact of shock when the cleaning port seals the injection port and the opening/closing detection, and has problems such as blood spatter, contamination, and malfunction of the device.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sampling mechanism for a blood gas analyzer that can reliably perform a sampling operation and reliably wash blood even if there are individual differences in the number of people handling the device.

[Means for solving problems]

The purpose of the above is to provide an air damper that presses the flap that opens and closes the sample injection port, and a detection unit that detects the opening and closing, so that when the flamp is closed, the cleaning port is constantly pushed by the injection port at a constant speed. This was achieved with a configuration equipped with a mechanism to do this.

[Effect]

The flap was designed to operate at a certain low speed, so there was no possibility of malfunction caused by the individual handling the device, and the opening/closing detection was made in conjunction with the movement of the flap. , there is no detection malfunction.

〔Example〕

The present invention will be explained in detail below using the embodiments shown in FIGS. 1 to 4.

FIG. 1 is a plan view showing an embodiment of the sampling mechanism of the blood gas analyzer of the present invention, FIG. 2 is a front view of FIG. 1, and FIG. 3 is a partial vertical sectional view of FIG. A series of operations such as measurement and cleaning in the analyzer are the same as in the prior art. Furthermore, the cleaning port seal structure is also the same.

The flamp 1 can be opened and closed around a fulcrum shaft 21 (Fig. 3), and when it is closed, the air damper 22 operates to push the cleaning port 3 toward the bush 5. The rotation fulcrum of the air damper 22 is the damper. It is on the stand 23 (Fig. 2), and the damper stand 2
3 is a rotary table 24 of the fulcrum shaft 21 of the flap 1 (Fig. 3)
The air damper 22 is installed in such a way that there is no change in the force that pushes the flap 1 due to dimensional errors.

The fulcrum of the conventional spring 8 was attached to a separate metal fitting from the sampling mechanism, so due to installation errors, the fulcrum of the spring 8 was attached to the flap 1.
The force of the push was changing.

A detection plate 25 for detecting opening/closing is provided on the slide shaft of the air damper 22, and a detector 26 is mounted on the damper stand 23.

Since the detector 26 is linked to the operation of the flap 1, it is possible to detect the opening and closing of the flap 1 without malfunction. In addition,
In FIG. 3, 27 is a rotating shaft, and 28 to 32 are bearings.

FIG. 4 is a detailed vertical sectional view showing one embodiment of the air damper 22 shown in FIG. 1, with the flap 1 shown in a closed state. When the flap 1 is opened, the slide shaft 4o moves in the C direction.

At this time, the air sealed inside the case 50 is compressed by the spring 51.
The spring holder 52 allows the air to come out from the air exhaust hole 53. Since this air discharge hole 53 has nothing to do with the opening speed of the flap 1, it is preferable that it be a large hole, for example, about 2 m in diameter.

When closing the flap 1, the slide shaft 4
0 in the D direction. At this time, the sealed air in the case 50 is pushed by the slide 54 and is made to come out little by little from the air exhaust hole 55. This air exhaust hole 5
5 is a small hole with a diameter of about 0.5 wr, for example, so that the slide shaft 40 moves at a certain low speed.

When the movement in the D direction is completed, all the air comes out from the air exhaust hole 55, so the only pressing force left is the spring 51, and the cleaning port 3 is completely sealed to the bush 5 with a constant pressure. be able to. In addition, 41.4 in Figure 4
2 is a boss, 56° and 57 are O-rings, 58 and 59 are E-rings, and 60 is an air damper shaft.

〔Effect of the invention〕

According to the present invention as described above, there is no scattering of blood adhering to the surface of the injection port when the cleaning port seals the injection port, and the surface of the injection port can be completely cleaned, and measurement results without contamination can be obtained. In addition, since a detector is provided that is linked to the flap, malfunctions can be prevented and the reliability of the blood gas analyzer can be improved.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the sampling mechanism of the blood gas analyzer of the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3 is a partial vertical sectional view of FIG. 2, and FIG. The figure is a detailed vertical sectional view showing one embodiment of the air damper shown in FIG. 1, FIGS. 5 and 6 are diagrams of a conventional cleaning system, and FIG. 7 is a configuration diagram of a conventional sampling mechanism. 1...Framp, 2...Mounting plate, 3...Washing port,
4... Spring, 5... Bush, 6... Inlet, 9
...Tube, 10...Measuring section, 22...Air damper, 23...Damper stand, 25...Detection plate for opening/closing detection, 26...Detector. 40...Slide shaft, 51...Spring.

Claims (1)

[Claims] 1. It has a sample injection port, an air damper that presses a flap that opens and closes the sample injection port, and a detection section that detects the opening and closing of the flap, so that when the flap is closed, the cleaning port is constantly provided at the sample injection port. A sampling mechanism for a blood gas analyzer, characterized by comprising a mechanism that acts to be pushed at a constant speed.