Sample adding device for immunoassay instrument

Abstract

The utility model discloses a sample adding device for an immunoassay instrument, which belongs to the technical field of medical in-vitro diagnosis and detection and comprises a shell, a voice coil motor is arranged in the shell and connected with a plunger pump, and the lower end of the plunger pump extends out of the shell and is connected with a sample adding needle; and a position sensor is also arranged in the shell. According to the sample adding device for the immunoassay instrument, the plunger pump is driven to operate through the voice coil motor, and the displacement amount of the rotor can be accurately detected through the grating, so that the purpose of accurately controlling the sample extraction amount is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical in vitro diagnostic detection, in particular to a sample adding device for an immunoassay instrument. Background Art

[0002] Fully automated chemiluminescence immunoassay analyzers are clinically used to qualitatively or quantitatively detect analytes in patient serum, plasma, whole blood, and urine samples. The immunoassay dosing device requires a small sample volume with high precision control to ensure accurate dosing and uniform mixing, thereby guaranteeing accurate and reliable analysis results.

[0003] The sample dispenser plays a crucial role in immunoassay instruments, improving analysis accuracy and repeatability, and is crucial for expanding the performance and application range of immunoassay instruments. Precision sample dispensers typically consist of a dispenser and a control system. The dispenser typically includes one or more sample channels for adding samples and reagents to the reaction system. The control system, typically via a motor or pneumatic system, controls the movement of the dispenser and the amount of sample dispensed.

[0004] Common motor-driven dosing devices use a stepper motor to rotate a screw, which in turn drives the dosing pump plunger in linear reciprocating motion. The speed and acceleration of this drive system are limited by the characteristics of the stepper motor. The screw typically uses a fine thread, suitable for precision transmission with small displacements and high displacement accuracy requirements. The small pitch of fine threads results in lower thread strength, which has certain disadvantages in terms of wear and impact resistance. Consequently, precision dosing devices can experience performance degradation or even malfunction after prolonged use under high loads, impacting the stability and reliability of the analytical instrument. Utility Model Content

[0005] In order to address the deficiencies in the above-mentioned prior art, the purpose of the present utility model is to provide a sample adding device for an immunoassay instrument, which drives the operation of a plunger pump through a voice coil motor, and the grating can accurately detect the displacement of the mover to achieve the purpose of accurately controlling the sample extraction amount.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] Provided is a sample adding device for an immunoassay instrument, comprising a housing, a voice coil motor disposed in the housing, the voice coil motor connected to a plunger pump, the lower end of the plunger pump extending from the housing and connected to a sample adding needle;

[0008] A position sensor is also provided in the housing.

[0009] Furthermore, the position sensor is a grating displacement sensor.

[0010] Furthermore, the plunger pump includes a pump body and a plunger, and the plunger is connected to the voice coil motor through a connecting piece.

[0011] Furthermore, the voice coil motor includes a stator and a mover, the stator is fixed in the housing, and the mover is connected to the plunger.

[0012] Furthermore, the grating displacement sensor includes a main grating portion and a grating indicating portion, and the grating indicating portion and the plunger form a combination that can move synchronously.

[0013] Furthermore, the shell is made of a material having magnetic field shielding properties.

[0014] Furthermore, the housing is connected to the slide of the sample loading arm.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. The sample loading device for immunoassay instruments in this utility model eliminates the commonly used stepper motor lead screw drive system and adopts a voice coil motor as the driving motor. The voice coil motor directly drives the operation of the plunger pump. The voice coil motor has the characteristics of fast response speed and stable movement, thereby achieving the purpose of accurately controlling the sample extraction volume;

[0017] 2. The sample adding device for immunoassay instrument of the present invention uses a grating displacement sensor to detect the movement speed and displacement of the voice coil motor mover. When the mover moves, the grating can accurately detect its displacement, and then the control system calculates whether the extraction amount meets the requirements;

[0018] 3. The sample adding device for immunoassay instrument in the example of the present invention has a housing made of a material with magnetic shielding properties, which can prevent the voice coil motor from affecting the immunoassay instrument, especially the magnetic beads added to the sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0020] Figure 1 This is a schematic diagram of the structure of the utility model;

[0021] Figure 2 A structural diagram from another perspective.

[0022] In the figure: 1-housing, 2-voice coil motor, 201-stator, 202-mover, 3-plunger pump, 301-pump body, 302-plunger, 4-grating displacement sensor, 401-main grating part, 402-grating indication part, 5-sample needle, 6-sample arm, 7-slide. DETAILED DESCRIPTION

[0023] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the relevant utility model and are not intended to limit the utility model. It should also be noted that, for ease of description, only the portions relevant to the utility model are shown in the accompanying drawings.

[0024] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] like Figure 1-2 As shown, this embodiment provides a sample loading device for an immunoassay instrument. This sample loading device can be bolted to a slide 7 of an immunoassay instrument's sample loading arm 6 and can move up and down along the slide 7 along the sample loading arm 6. In this embodiment, the sample loading device includes a housing 1, within which is disposed a voice coil motor 2 connected to a plunger pump 3. The lower end of the plunger pump 3 extends from the housing 1 and is connected to a sample loading needle 5. The voice coil motor 2 drives the movement of the plunger pump 3, which is responsible for drawing and injecting the sample. The pump body 301 of the plunger pump 3 is mounted on the housing 1. The housing 1 also includes a position sensor for controlling the extraction volume.

[0026] Specifically, the plunger pump 3 includes a pump body 301 and a plunger 302. The plunger 302 is connected to the voice coil motor 2 via a connector. The voice coil motor drives the plunger 302 up and down, thereby completing sampling and adding samples. The voice coil motor 2 includes a stator 201 and a mover 202. The stator 201 is fixed in the housing 1, and the mover 202 is connected to the plunger 302.

[0027] In this embodiment, the position sensor is a grating displacement sensor 4 , which includes a main grating portion 401 and a grating indicating portion 402 . The grating indicating portion 402 and the plunger 302 form a combination that can move synchronously.

[0028] Since the voice coil motor 2 itself is made of magnetic material, it may affect the immunoassay analyzer, especially the magnetic beads added to the sample. Therefore, the housing 1 is made of a material with magnetic field shielding properties, such as iron-nickel alloy, iron-aluminum alloy, etc., to prevent the magnetic material contained in the voice coil motor 2 from negatively affecting the detection of the analyzer.

[0029] In an immunoassay instrument, when the inner diameter of the sampling needle and the inner diameter and length of the tubing remain constant, the control system converts the values ​​and precisely controls the movement of the plunger pump 3, achieving precise control of the sample extraction volume. The voice coil motor 2 achieves position control through a drive circuit and a control circuit. When the voice coil motor 2's actuator 202 performs reciprocating linear motion, it drives the plunger 302 to move synchronously, thereby completing the liquid pumping operation of the plunger pump 3. The grating displacement sensor 4 detects the displacement of the plunger 302, effectively monitoring the amount of liquid pumped by the plunger pump 3.

[0030] The sample adding device for immunoassay instrument illustrated in this embodiment solves the problem of easy wear of the screw in the existing stepping motor, improves the stability and accuracy of the device, and thus achieves the effect of accurately controlling the sample extraction amount.

[0031] Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also includes other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the concept of the utility model. For example, the above-mentioned features can be replaced with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A sample adding device for an immunoassay instrument, characterized in that: The invention comprises a housing (1), wherein a voice coil motor (2) is provided in the housing (1), the voice coil motor (2) is connected to a plunger pump (3), and the lower end of the plunger pump (3) extends from the housing (1) and is connected to a sample injection needle (5); A position sensor is also provided in the housing (1).

2. A sample adding device for an immunoassay instrument according to claim 1, characterized in that: The position sensor is a grating displacement sensor (4).

3. A sample adding device for an immunoassay instrument according to claim 2, characterized in that: The plunger pump (3) comprises a pump body (301) and a plunger (302), and the plunger (302) is connected to the voice coil motor (2) via a connecting piece.

4. A sample adding device for an immunoassay instrument according to claim 3, characterized in that: The voice coil motor (2) comprises a stator (201) and a mover (202); the stator (201) is fixed in the housing (1); and the mover (202) is connected to a plunger (302).

5. The sample adding device for immunoassay instrument according to claim 3, characterized in that: The grating displacement sensor (4) comprises a main grating portion (401) and a grating indicating portion (402), wherein the grating indicating portion (402) and the plunger (302) form a combined body capable of synchronous movement.

6. The sample adding device for immunoassay instrument according to claim 1, characterized in that: The shell (1) is made of a material having magnetic field shielding performance.

7. A sample adding device for an immunoassay instrument according to any one of claims 1 to 6, characterized in that: The housing (1) is connected to a slide (7) of a sample loading arm (6).

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