A pipette pump with automatic needle removal function

Abstract

The present invention relates to the technical field of pipette pumps, and discloses a pipette pump with an automatic needle removal function, comprising a pipette pump module, a pump drive motor, and a sample needle adapter. The pipette pump module is provided with a pump body, the pump body is provided with a first slide groove, the output shaft of the pump drive motor is provided with a guide sleeve, and a boss is provided above the guide sleeve. When the pump drive motor is working, the boss slides in the first slide groove, and the boss is higher than the outer surface of the pump body. The pipette module is provided with a push rod, the axis of the push rod is parallel to the axis of the pump drive motor, the push rod is located below the boss, the upper end of the push rod is provided with a limit block, and the lower end of the push rod passes through the pipette pump module. The sample needle adapter is provided with a syringe for removing the needle, and the upper part of the syringe for removing the needle is connected to the lower end of the push rod. The purpose of the present invention is to provide a pipette pump with an automatic needle removal function, which is used to complete the automatic needle removal action without adding an additional drive module and installation space.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid transfer pumps, in particular to a liquid transfer pump with an automatic needle removal function. Background Art

[0002] In the field of in vitro diagnostic medical devices, pipette pumps are required for processes such as sample or reagent distribution. Disposable sample needles are usually used to avoid drag contamination during the experiment. Therefore, the needle needs to be frequently removed and removed during the experiment. For the needle removal step, a needle removal mechanism is generally set up on the equipment platform. The pipette pump needs to move with the robotic arm to the needle removal mechanism to remove the needle, which is time-consuming and reduces the efficiency of the experiment. The needle can only be removed at a fixed position, which also affects the flexibility of the equipment.

[0003] To address this problem, the current solution is to add a special needle removal mechanism to the pipette pump, and complete the needle removal by pushing the syringe through the electromagnet on the needle removal mechanism, or to complete the needle removal through a motor-driven lever mechanism. Both methods require increasing the installation space of the needle removal drive module, and also increase the weight of the pipette pump. In order to improve experimental efficiency, most of the current in vitro diagnostic medical equipment uses multiple needles for sample addition, which will make the sample addition arm wide and bulky, affecting the flexibility of the sample addition arm while reducing its range of motion, increasing the equipment load, and affecting the service life and stability of the equipment. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a pipette pump with an automatic needle removal function, which is used to complete the automatic needle removal action without adding an additional drive module and installation space.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] The cam is provided with a first slide groove, and the pump driving motor is a through-shaft motor; the guide sleeve is installed on the through-shaft of the pump driving motor; the guide sleeve is provided with a boss; when the pump driving motor is working, the through-shaft moves along the length direction of the cavity, and the boss slides in the first slide groove; the boss is higher than the outer surface of the pump body; the pipetting module is provided with a push rod, the axis of the push rod is parallel to the axis of the pump driving motor, the push rod is located below the boss, the upper end of the push rod is provided with a limit block, the lower end of the push rod passes through the pipetting pump module, and the sample adding needle adapter is covered with a remove syringe, and the upper part of the remove syringe is connected to the lower end of the push rod.

[0007] In the above-mentioned pipette pump, the pump drive motor drives the pipette pump module to complete the suction and injection actions. When the needle needs to be removed after the injection is completed, the pump drive motor continues to operate to drive the guide sleeve to continue to move downward, and the boss on the guide sleeve pushes the push rod to continue to move downward. The push rod pushes the syringe barrel to move downward, thereby pushing the sample needle downward until it is separated from the sample needle adapter, thereby completing the needle removal action.

[0008] Furthermore, a second sensor is installed in front of the pump body, and a second sensing plate is provided on the limit block. The active area of ​​the second sensing plate passes through the sensing area of ​​the second sensor. Its function is to locate and monitor the position of the push rod, thereby achieving effective control of the liquid suction, liquid injection accuracy and needle removal action.

[0009] Furthermore, a reset spring is provided at the lower end of the push rod, one end of the reset spring is fixed to the pipetting module, and the other end is fixed to the needle removal cylinder. Its function is to reset the position of the push rod after the needle removal action is completed.

[0010] Furthermore, a sensor mounting hole and a second slide groove are opened at the rear of the pump body, a first sensor is installed on the sensor mounting hole, and a first sensing piece is provided under the guide sleeve. When the pump drive motor is working, the first sensing piece slides in the second slide groove, and the active area of ​​the first sensing piece passes through the sensing area of ​​the first sensor. Its function is to detect the needle removal result of the pipetting pump and feedback the needle removal status of the sampling needle.

[0011] Furthermore, the installation position of the first sensor is higher than that of the second sensor, and its function is to simplify the parts structure so that the guide sleeve can simultaneously meet the needs of needle removal detection sensing and pushing the push rod to complete needle removal.

[0012] In combination with the above technical solutions, compared with the prior art, the present invention provides a pipette pump with an automatic needle removal function, which has the following beneficial effects:

[0013] The pipette pump provided by the present invention adopts a pump drive motor and its transmission mechanism to directly remove the needle, which has high transmission efficiency, greatly reduces the risk of needle removal failure, reduces manual intervention, and greatly improves the automatic intelligent operation level of the machine.

[0014] The pipette pump provided by the present invention has a needle-removing mechanism integrated on the pipette pump module, and can independently complete the operations from needle removal, liquid aspiration, liquid injection, and needle removal. Its structure is simple and compact, which is convenient for the integration of automatic needle-removing pumps to form a multi-channel loading arm, which can maximize the loading efficiency and loading accuracy of the loading arm.

[0015] The pipette pump provided by the present invention is equipped with dual sensors for origin detection and needle removal detection. The first sensor directly provides feedback on the needle removal status, facilitating real-time control of needle anomalies during the pipette pump's sample loading process, enhancing the machine's intelligence. The second sensor ensures that the pipette pump returns to the origin position each time it aspirates and removes the needle, ensuring the accuracy of aspiration and pipetting, as well as the consistency of needle removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of a pipetting pump with automatic needle removal function according to the present invention.

[0017] Figure 2 It is a structural schematic diagram of the front of the pump body of the present invention.

[0018] Figure 3 It is a structural schematic diagram of the rear of the pump body described in the present invention.

[0019] Figure 4 This is a schematic diagram of the installation position structure of the guide sleeve inside the pump body according to the present invention.

[0020] Figure 5 This is a partially enlarged view of the installation position of the second sensor described in the present invention.

[0021] Figure 6 It is a structural schematic diagram of the guide sleeve described in the present invention.

[0022] Figure 7 This is a schematic structural diagram of the limit block described in the present invention.

[0023] Among them, 1-pipette pump module, 11-pump body, 111-first slide, 112-cavity, 113-sensor mounting hole, 114-second slide, 12-sample needle adapter, 2-second sensor, 3-pump drive motor, 4-guide sleeve, 41-boss, 42-first sensor plate, 5-push rod, 6-limit block, 61-second sensor plate, 7-return spring, 8-syringe removal, 9-sample needle, 10-first sensor. DETAILED DESCRIPTION

[0024] To illustrate the technical features, objectives and effects of the present invention in detail, the following is a further description with reference to the accompanying drawings:

[0025] like Figure 1-7As shown, a pipette pump with an automatic needle removal function includes a pipette pump module 1, a pump drive motor 3 and a sample needle adapter 12, characterized in that: the pipette pump module is provided with a pump body 11, the interior of the pump body 11 is a cylindrical cavity 112, the pump body 11 is provided with a first slide groove 111, the pump drive motor 3 is a through-axis motor, a guide sleeve 4 is installed on the through-axis of the pump drive motor 3, and a boss 41 is provided above the guide sleeve 4. When the pump drive motor 3 is working, its through-axis The shaft moves along the length direction of the cavity 112, and the boss 41 slides in the first slide groove 111. The boss 41 is higher than the outer surface of the pump body 11). A push rod 5 is installed on the pipetting module 1. The axis of the push rod 5 is parallel to the axis of the pump drive motor 3. The push rod 5 is located below the boss 41. A limit block 6 is installed on the upper end of the push rod 5. The lower end of the push rod 5 passes through the pipetting pump module 1. The sample needle adapter 12 is covered with a syringe 8, and the upper part of the syringe 8 is connected to the lower end of the push rod 5.

[0026] Preferably, a second sensor 2 is installed in front of the pump body 11 , and a second sensing piece 61 is provided on the limit block 6 , and the active area of ​​the second sensing piece 61 passes through the sensing area of ​​the second sensor 2 .

[0027] Preferably, a return spring 7 is provided at the lower end of the push rod 5 , one end of the return spring 7 is fixed to the pipetting module 1 , and the other end is fixed to the syringe 8 .

[0028] Preferably, a sensor mounting hole 113 and a second slide groove 114 are opened at the rear of the pump body 11, and a first sensor 10 is installed on the sensor mounting hole 113. A first sensing plate 42 is provided under the guide sleeve 4. When the pump drive motor 3 is working, the first sensing plate 42 slides in the second slide groove 114, and the active area of ​​the first sensing plate 42 passes through the sensing area of ​​the first sensor 10.

[0029] Preferably, the installation position of the first sensor 10 is higher than that of the second sensor 2 .

[0030] The above embodiment provides a pipette pump with an automatic needle removal function, and its specific implementation steps are as follows:

[0031] During the needle removal process of the pipette pump, the sample adding needle 9 pushes the syringe 8 to move upward, and pushes the guide sleeve 4 upward through the push rod 5. The first sensing piece 42 moves upward along the second slide groove 114. When the needle is removed, the first sensing piece 42 enters the sensing area of ​​the first sensor 10, and the first sensor 10 feeds back the needle removal status to the device control module.

[0032] When liquid aspiration is required, the pipette pump is first initialized through the pump drive motor 3, and the pump drive motor 3 drives the guide sleeve 4 to move up and down, so that the boss 41 pushes the push rod 5 to move downward, so that the second sensing plate 61 enters the sensing area of ​​the second sensor 2, and the second sensor 2 feeds back to the device control module that the pipette pump has returned to the origin position, and uses this position as the initial position to control the liquid aspiration and injection actions to ensure the accuracy of liquid aspiration and injection.

[0033] After the injection action is completed and the needle needs to be removed, the pump drive motor 3 rotates, driving the guide sleeve 4 to move downward, so that the boss 41 pushes the push rod to move downward, so that the second sensing plate 61 enters the sensing area of ​​the second sensor 2, and the second sensor 2 feeds back to the device control system that it has reached the origin. The device control system sends corresponding instructions to the pump drive motor 3 based on the preset needle removal distance and the origin as the initial position, so that the pump drive motor 3 continues to operate according to the instructions to make the guide sleeve 4 continue to move downward by the preset distance, and the boss 41 pushes the push rod 5 downward, and the syringe 8 pushes the sample needle 9 away from the sample needle adapter 12 to complete the needle removal action.

[0034] After the needle removal action is completed, the pump drive motor 3 is initialized and returns to the original position, and the needle removal cylinder and the push rod are reset under the action of the reset spring.

[0035] It can be seen from the above embodiments and implementation steps that the pipette pump provided by the present invention can directly complete the drive and control of the needle removal process by the pump drive motor 3, without the need for an external needle removal structure, saving the installation space of the needle removal mechanism and reducing costs. Due to its compact structure, it is suitable for integration into a multi-channel loading arm, reducing the overall size and weight of the multi-channel loading arm.

[0036] The pipette pump provided by the present invention realizes needle removal detection and origin detection functions through the first sensor 10 and the second sensor 2, which facilitates the equipment control system to detect the needle removal results and the position detection of the liquid aspiration, liquid injection and needle removal processes, thereby ensuring the needle removal success rate and the liquid aspiration and liquid injection accuracy.

[0037] Applicant declares that the above-described embodiments merely illustrate the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and the specification merely illustrate the principles of the present invention. Those skilled in the art will readily appreciate that various changes and modifications can be made without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

[0038] The present invention is not limited to the above-mentioned embodiments. Any embodiments that use structures and methods similar to those of the present invention to achieve the purpose of the present invention are within the protection scope of the present invention.

Claims

1. A pipette pump with an automatic needle removal function, comprising a pipette pump module, a pump drive motor, and a sample needle adapter, characterized in that: The pipetting pump module is provided with a pump body, the interior of the pump body is a cylindrical cavity, a first slide groove is opened on the pump body, the pump driving motor is a through-shaft motor, a guide sleeve is installed on the through-shaft of the pump driving motor, and a boss is provided above the guide sleeve. When the pump driving motor is working, its through-shaft moves along the length direction of the cavity, the boss slides in the first slide groove, and the boss is higher than the outer surface of the pump body. A push rod is installed on the pipetting pump module, and the axis of the push rod is parallel to the axis of the pump driving motor. The push rod is located below the boss, and a limit block is installed on the upper end of the push rod. The lower end of the push rod passes through the pipetting pump module, and a syringe needle is sleeved on the sample adding needle adapter, and the upper part of the syringe needle is connected to the lower end of the push rod; A second sensor is installed in front of the pump body, and a second sensing piece is provided on the limit block. The active area of ​​the second sensing piece passes through the sensing area of ​​the second sensor; A sensor mounting hole and a second chute are provided at the rear of the pump body. A first sensor is installed on the sensor mounting hole. A first induction sheet is provided below the guide sleeve. When the pump drive motor is working, the first induction sheet slides in the second chute, and the active area of ​​the first induction sheet passes through the sensing area of ​​the first sensor. The installation position of the first sensor is higher than that of the second sensor; the first sensing piece and the first sensor are used to detect whether the needle is in place, the second sensing piece and the second sensor are used to feedback the origin position of the pipetting pump, and the second sensing piece and the second sensor are also used in the needle removal operation, with the origin position as the initial position, to move the guide sleeve downward by a preset distance, allowing the boss to push the push rod downward, and the syringe remover pushes the sample needle away from the sample needle adapter to complete the needle removal action; when the first sensing piece enters the sensing area of ​​the first sensor, the second sensing piece is located above the second sensor.

2. The pipetting pump with automatic needle removal function according to claim 1, characterized in that: A return spring is provided at the lower end of the push rod, one end of the return spring is fixed on the pipetting module, and the other end is fixed on the needle cylinder.

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