JPH04120359U - Liquid suction and drainage device - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the cost and size of a liquid suction/drainage device by greatly simplifying the drive mechanism. [Structure] Two syringes are operated simultaneously by one drive mechanism, and the suction and discharge of one liquid and the suction and discharge of the other liquid are switched and controlled by a three-way switching valve.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is suitable for example as a liquid suction/drainage device for sampling devices of automatic analyzers. Regarding.

0002

[Prior art and its issues]

As is well known, the sampling device of an automatic analyzer uses a pipette to aspirate a serum sample. It is used to dispense this aspirated serum sample into another container, and after dispensing Next, the pipette should be rinsed with wash water to avoid mixing with the aspirated sample. It is composed of

0003 For this reason, in the conventional sampling device described above, the syringe that sucks and drains the serum sample and Two syringes are installed: one that sucks up the washing water and sends it to the pipette. Therefore, these syringes each have their own independent drive mechanism. It was configured to be connected to a structure to perform suction and discharge operations.

0004 However, with this type of sampling device, after aspirating and draining the serum sample, cleaning is required. There are differences in the timing of the operation of the two syringes, such as sending water to the pipette. However, the current situation is that each device is operated by an independent drive mechanism. Therefore, the drive mechanism is complicated and the cost is high, and the sampling equipment is required. The problem was that the equipment became larger.

[0005] This idea was devised in view of the current situation, and its purpose is The filter operates two syringes at the same time using one drive mechanism to collect serum samples, etc. The suction and discharge of one liquid and the suction and discharge of the other liquid such as cleaning water are controlled by a three-way switching valve. This greatly simplifies the drive mechanism, resulting in a low-cost, small-sized liquid suction/drainage device. This is what we are trying to provide.

[0006]

[Means to solve the problem]

In order to achieve the above object, this invention uses a liquid suction/drainage device with one end connected to a pipette. A pipe line whose other end is connected to one end and a three-way switching valve, and a midway part of this pipe line. A first syringe is connected in communication with the three-way switching valve, and one end is connected in communication with the three-way switching valve, and the other end is connected in communication with the three-way switching valve. a pipe line connected to the liquid tank, and a second pipe line whose upper end is connected to the three-way switching valve. a syringe and a connecting body that connects the suction and discharge operation rods of the first and second syringes; Connected to this connecting body, the suction and discharge operation rods of the first and second syringes can be raised and lowered at the same time. The invention is characterized in that it is configured to include a drive device for moving the vehicle.

[0007]

[Effect]

Therefore, in the liquid suction/drainage device according to this invention, two The syringes are operated at the same time to aspirate and drain liquid from one side, such as a serum sample, and from the other side, such as washing water. The suction and discharge of liquid is controlled by the three-way switching valve.

[0008]

【Example】

This invention will be described in detail below based on an embodiment shown in the accompanying drawings.

[0009] Figure 1 shows the case where this idea is applied to the sampling device of an automatic analyzer. The sampling device according to this embodiment has one end communicatively connected to the pipette 1. A pipe line 3 whose other end is connected to the three-way switching valve 2 is connected to the middle part of this pipe line 3. One end of the first syringe 4 is connected to the three-way switching valve 2, and the other end is connected to the washing water. A pipe line 6 was connected to the tank 5 and the upper end was connected to the three-way switching valve 2. The second syringe 7 and the suction/discharge operation rods 4a, 7 of the first and second syringes 4, 7 a connecting body 8 connecting the first and second syringes 4 connected to the connecting body 8; , 7, and a drive device 10 for simultaneously raising and lowering the suction/exhaust operation rods 4a, 7a. has been completed.

0010 The first syringe 4 is for aspirating and discharging the serum sample through the pipette 1. As shown in FIG. mode is set. Note that inside the upper end conduit of the first syringe 4, there is a A check valve is interposed therein to prevent washing water, etc. flowing through the pipe 3 from flowing into the pipe. ing.

[0011] Further, the second syringe 7 is for sucking and discharging washing water through the pipe line 6. During the suction/exhaust operation, the three-way switching valve 2 connects the pipe line 6 and the second syringe 7, as shown in FIG. is set in a state in which the Set.

0012 Therefore, the three-way switching valve 2 is connected to the conduit 3 and the first syringe during the serum sample suction and discharge operation. 4 are set in communication with each other, and the conduit 6 and the second syringe 7 are set in communication with each other, In addition, when the washing water is sent out, the pipe line 3 and the second syringe 7 are connected as shown in FIG. It is set in a state where it communicates and the pipe line 6 is closed. Furthermore, this three-way switching valve 2 The switching control is performed by a known control device including a CPU or the like.

[0013] The drive device 10 includes a forward and reverse rotation motor 11 and a forward and reverse rotation motor 11. The main pulley 12 is rotatably supported at a position away from the main pulley 12. A driven pulley 13 and a belt chain suspended between the main pulley 12 and the driven pulley 13. It consists of a belt chain 14 and an actuating body 15 whose one end is fixed to the belt chain 14. The connecting body 8 is connected to the other end of the operating body 15 via a bolt and nut 16. The connection has been fixed.

[0014] In this way, by connecting the connecting body 8 and the actuating body 15 with the bolts and nuts 16, The amount of liquid sucked and discharged by the first syringe 4 and the second syringe 7 can be easily adjusted. .

[0015] Therefore, by rotating the forward/reverse rotation motor 11 in one direction, the belt chain can be rotated. The actuating body 15 whose one end is fixed to the ring 14 moves up and down, and as a result, the actuating body 15 is connected to the actuating body 15. Since the connected body 8 also moves up and down, one drive mechanism can move the first and second syringes 4, 7 can be operated simultaneously. Of course, the drive mechanism used in this invention is It is not limited to the mechanism shown in the drawings, but may include other known lifting/lowering drive mechanisms. can be used.

[0016] Next, the operation of the sampling device configured as above will be explained. .

[0017] First, the three-way switching valve 2 is connected to the pipe line 3 and the first syringe 4 as shown in FIG. and was set in a serum sample suction/drainage state where the conduit 6 and the second syringe 7 communicated with each other. After that, the drive device 10 is operated to move the suction and discharge operation rods 4 of the first and second syringes 4 and 7. a and 7a are simultaneously lowered, and the first syringe 4 aspirates the serum sample. , the second syringe 7 sucks the cleaning water.

[0018] When this work is completed, the three-way switching valve 2 is connected to the pipe line 3 as shown in FIG. Set to the washing water delivery state where the second syringe 7 is in communication and the pipe line 6 is closed. and the pipette 1 is rotated and transferred to the serum sample dispensing position, and then the motor 11 rotates in the opposite direction, the suction/discharge operation rods 4a of the first and second syringes 4, 7 7a rises at the same time, and the serum sample aspirated into pipette 1 is directly below pipette 1. The washing water is transferred to the reactor and dispensed into the set reaction vessel (not shown). , after cleaning the inside of the pipette 1 via line 3, it is discharged into a cleaning trough (not shown). Served.

[0019] In general, since the amount of serum sample to be aspirated is small, the dispensing time to the reaction container is The cleaning water flowing in the pipe line 3 reaches from the second syringe 7 to the pipette 1. There is a certain delay in the amount of time required for the serum sample to be dispensed, so please be sure to By moving the trough 1 from the serum sample dispensing position to the washing trough position, the washing water is Inflow into the reaction vessel can be prevented. Therefore, the length and inner diameter of pipe line 3 are The serum sample dispensing time of kit 1 and the travel time to the washing trough position and each syringe 4, It is important to take into consideration the discharge pressure of No. 7 when making a decision.

[0020] In addition, in the above example, this idea is applied to the sampling device of an automatic analyzer. Although the explanation has been given using the case as an example, this invention is not limited to this. Moreover, it can also be applied to devices that perform other liquid suction and discharge operations.

[0021]

[Effect of the idea]

As explained above, according to the liquid suction/drainage device according to this invention, one drive mechanism Therefore, it is possible to operate two syringes at the same time, and to aspirate and drain one liquid such as a serum sample. It is configured so that the intake and discharge of the other liquid, such as cleaning water, is controlled by a three-way switching valve. As a result, the drive mechanism can be greatly simplified, resulting in a low-cost, small-sized liquid This provides an excellent effect of providing a suction/discharge device.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration of a liquid suction/drainage device according to an embodiment of the invention.

FIG. 2 is an explanatory diagram of main parts showing a state in which the three-way switching valve of the liquid suction and discharge device is switched to the wash water delivery side.

[Explanation of symbols]

1 pipette 2 3-way switching valve 3,6 Pipeline 4 1st syringe 4a First syringe suction/discharge operation rod 5 Liquid (washing water) tank 7 Second syringe 7a Second syringe suction/discharge operation rod 8 Connected body 10 Drive device

Claims (1)

[Scope of utility model registration request] [Claim 1] One end is connected to a pipette and the other end is connected to a pipette.
a pipe line connected to the three-way switching valve, a first syringe connected to the middle of the pipe line, and a pipe whose one end is connected to the three-way switching valve and the other end is connected to the liquid tank. a second syringe whose upper end is communicatively connected to the three-way switching valve; a connecting body connecting the suction/discharge operation rods of the first and second syringes; A liquid suction and discharge device comprising: a drive device that simultaneously raises and lowers a suction and discharge operation rod of a syringe.