A sample gun and method of use

Abstract

The application relates to the technical field of experimental apparatuses, and particularly discloses a sample adding gun and a use method, which comprise a cavity for transferring a solution and a suction head for transferring the solution, an outer cylinder is arranged on the outer side wall of the suction head and is communicated with an inner cylinder, a baffle for blocking the solution from entering the cavity is horizontally arranged in the suction head, a clamping mechanism for clamping the suction head is arranged at the bottom end of the cavity, the clamping mechanism is an expansion cylinder capable of being elastically deformed, a clamping hook capable of being connected with the upper portion of the suction head is arranged at the bottom end of the expansion cylinder, and a blocking ring capable of being matched with the clamping hook and protruding is arranged on the inner side wall of the upper portion of the suction head. The patent aims to solve the problem that some workers may violate the operation rules during the use of the sample adding gun, so that the solution to be transferred is inhaled into the cavity of the sample adding gun, and the internal components of the sample adding gun are polluted and damaged.

Description

Technical Field

[0001] This invention relates to the field of experimental equipment technology, and in particular to a sample application gun and its usage method. Background Technology

[0002] In daily laboratory work, precise transfer of quantitative liquids is required. While pipettes are a traditional means of liquid transfer, their numerous steps and time-consuming operation have led to their limited use in clinical laboratories. In contrast, more efficient liquid transfer instruments—pipettes, also known as sample pipettes—are typically used in laboratories. Pipettes offer advantages such as high precision, applicability to a wide range of liquids, and ease of operation.

[0003] When using a pipette to draw liquid, the thumb must be released slowly and steadily. Sudden release is not allowed to prevent the solution from being drawn in too quickly and rushing into the chamber. After use, the pipette needs to be disassembled, and any contaminated parts that may have entered the chamber should be cleaned. However, because pipettes are precision instruments, disassembly often requires sending them to a professional institution for reassembly and precision adjustment, which is quite troublesome. Therefore, it is crucial to avoid drawing solution into the pipette chamber during use. However, in practice, a small number of personnel may violate these procedures, resulting in some solution being drawn into the chamber and causing contamination. Secondly, when connecting the nozzle of the pipette to the tip, some operators, in order to ensure a tight connection, will hold the pipette in their hand, then press down firmly after aligning the pipette tip and the tip to compress them together. However, some operators, due to negligence, will only lightly slip the tip onto the bottom of the pipette. Although the nozzle and tip appear to be connected, the tip may accidentally fall off during liquid transfer, causing transfer failure and contaminating the laboratory environment. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a pipette and its usage method. Firstly, it solves the problem that during use, improper operation by some staff can lead to the aspiration of the solution to be transferred into the pipette cavity, contaminating and damaging internal components. Secondly, it addresses the issue that when staff connect the pipette tip to the pipette, negligence can cause an unstable connection, potentially leading to the tip detaching during pipetting and contaminating the experimental environment.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0006] A pipette includes a cavity for transferring a solution and a pipette tip for transferring the solution. The outer wall of the pipette tip is provided with a cavity that is connected to an inner cylinder. A baffle is installed laterally inside the pipette tip to prevent the solution from entering the cavity. A clamping mechanism for locking the pipette tip is installed at the bottom of the cavity. The clamping mechanism is an expansion cylinder that can produce elastic deformation. The bottom end of the expansion cylinder is provided with a hook that can be connected to the upper part of the pipette tip. The inner side wall of the upper part of the pipette tip is provided with a protruding retaining ring that can cooperate with the hook.

[0007] A method for using a sample dispenser includes the following steps:

[0008] S1. Take out the pipette, hold the pipette in your hand, and connect the bottom of the pipette to the pipette tip for drawing the solution;

[0009] S2. Adjust the amount of solution to be drawn into the pipette tip on the pipette, and move the pipette with the pipette tip connected to it directly above the solution;

[0010] S3. At this point, insert the pipette tip into the extracted solution and submerge the bottom 2 / 3 of the pipette tip in the solution. Then, activate the push device inside the pipette to draw the solution into the pipette tip.

[0011] S4. Transfer the solution temporarily drawn into the pipette tip to a position directly above the container where the liquid is added. At this point, the pusher in the pipette will slowly draw the solution out.

[0012] S5. After the solution has drained completely from the pipette tip, move the pipette directly above the container holding the contaminated pipette tip, detach the pipette tip from the pipette, and discard the pipette tip in the container holding the contaminated pipette tip.

[0013] The principle behind this solution is:

[0014] When using a pipette, it needs to be connected to the pipette tip. The expansion tube inside the pipette chamber is placed on top of the pipette tip. The hook of the expansion tube expands outward and hooks onto the retaining ring inside the pipette tip. By hooking onto the retaining ring, a tight connection between the pipette and the pipette tip is achieved. When the pipette draws a solution, the solution will enter the pipette tip. If the operator makes a mistake and the solution rushes up to the top of the pipette tip, some of the rushing solution will be blocked by the baffle, and some solution will enter the outer tube. This prevents the solution from directly entering the pipette chamber and contaminating the components inside the pipette chamber.

[0015] The beneficial effects of this plan are:

[0016] 1. In this application, by setting an expansion cylinder, a hook, and a retaining ring, the expansion cylinder is inserted into the retaining ring of the pipette tip. At this time, the expansion cylinder expands, hooking the hook into the retaining ring, thus fixing the pipette tip. Compared with the traditional method of fixing the pipette tip by pressing, which is prone to improper operation by the operator, resulting in an unreliable connection between the pipette tip and the dispensing gun, in this application, if the operator fails to fix the hook and the retaining ring, the pipette tip will slip when the dispensing gun is lifted, making it impossible for the pipette tip to be lifted by the dispensing gun. At this time, the operator can perform a secondary operation to connect the pipette tip and the dispensing gun. Secondly, the pressing method for connecting the pipette tip and the dispensing gun is prone to damage if the pressing force is too large. If the pressing force is too large, it will damage the cavity of the dispensing gun and the connection of the pipette tip. Moreover, controlling the pressing force is difficult for first-time users of the dispensing gun, which increases the probability of damage to the dispensing gun. The solution of this application can avoid directly pressing the pipette tip. When connecting, it is only necessary to insert the hook into the pipette tip to lock the retaining ring.

[0017] 2. In this application, by setting an outer cylinder that is connected to the pipette tip, when the operator violates the procedure and causes the solution inside the pipette tip to surge upward, the baffle inside the pipette tip will block part of the surged solution, while a large amount of the surged solution will enter the outer cylinder and be collected, thus reducing the possibility of the solution surging upward and entering the pipette chamber.

[0018] Furthermore, the surface of the retaining ring is covered with anti-slip rubber; the anti-slip rubber on the outer periphery of the retaining ring can prevent the hook from sliding inside the suction head when it hooks onto the retaining ring.

[0019] The top of the pipette tip is an inverted conical opening. The inner wall of the top of the pipette tip is covered with an inverted conical sealing rubber. The sealing rubber at the top of the pipette tip fits tightly against the outer periphery of the pipette cavity. After the hook catches the retaining ring, the connection between the pipette tip and the pipette is in a sealed state.

[0020] Furthermore, a fixing frame for fixing the expansion cylinder is installed horizontally inside the cavity. The outer periphery of the fixing frame is fixed to the inner side wall of the cavity, and the bottom end of the fixing frame is fixedly connected to the top end of the expansion cylinder as a whole. The fixing frame fixes the expansion cylinder. When the expansion cylinder expands and contracts, the fixing frame can provide stable support force to prevent the expansion cylinder from moving up and down.

[0021] Furthermore, a screw is vertically installed in the middle of the expansion cylinder, and a push plate that can move up and down is threaded onto the screw. The outer peripheral wall of the push plate can contact the inside of the expansion cylinder. A drive device is connected to the top of the screw. The rotation of the screw drives the push plate to move up and down. The cross-sectional structure of the expansion cylinder is roughly narrow at the top and wide at the bottom. When the push plate enters the top of the expansion cylinder, the outer periphery of the push plate pushes the expansion cylinder into an expansion state. By adjusting the moving position of the push plate, the expansion range of the expansion cylinder can be adjusted in real time, thereby making it easier for the hook to better catch the retaining ring.

[0022] Furthermore, the driving device is a bevel gear. One end of the bevel gear is fixed to the top of the screw, and the other end of the bevel gear is fixedly connected to a rotating rod. The rotating rod extends laterally outward from the cavity. A rotatable cylinder is fitted on the side of the rotating rod that extends out of the cavity. The operator can turn the cylinder by hand, and under the drive of the bevel gear, the rotation direction of the screw can be adjusted, thereby controlling the moving position and moving distance of the push plate.

[0023] Furthermore, retractable guide posts are vertically fixed on both sides of the push plate. The top of the guide posts is fixedly connected to the bottom of the fixed frame. The retractable guide posts restrict the movement direction of the push plate and prevent the push plate from tilting laterally during the movement of the push plate, which would cause the hook to fail to engage the retaining ring.

[0024] Furthermore, the driving device is a first motor that drives the screw to rotate. The middle part of the screw has a vertical and hollow air inlet pipe. The air inlet pipe does not contact the inner wall of the screw. The top of the air inlet pipe extends towards the upper part of the cavity. The first motor directly drives the screw to rotate. By adjusting the speed of the first motor, the push plate can be moved quickly to quickly connect the sample gun and the pipette tip. The air inlet pipe in the middle of the screw is used for the sample gun to draw the solution. There is a gap between the air inlet pipe and the inside of the screw to prevent the air inlet pipe from being affected when the screw rotates.

[0025] Furthermore, a pushing device is installed at the top of the cavity. The pushing device is a vertically movable pressure rod. The bottom end of the pressure rod is connected to a piston, and the top of the pressure rod is connected to a second motor. A sealing gas ring is set on the outer periphery of the piston. A horizontal partition is installed below the piston and is fixedly connected to the inner wall of the cavity. The top of the air inlet pipe runs vertically through the partition and is fixedly connected to the partition. A push switch for controlling the start of the first motor is installed on the top surface of the partition. The pushing device is the component for extracting the solution. The second motor drives the piston to move up and down, doing work on the gas in the space below the piston and drawing the solution into the pipette tip. When the piston moves to the lowest position, it will squeeze the push switch. At this time, the push switch controls the first motor to drive the screw to reset and disengage the hook from the pipette tip. However, since the solution needs to be discharged during the transfer process, the piston will also move downward. At this time, the piston will not move completely to the lowest position to ensure that the squeeze switch is not pressed. After the required dose of solution is discharged, the second motor can be activated to drive the piston to move and squeeze the push switch, discarding the small amount of solvent remaining in the pipette tip along with the pipette tip.

[0026] The cavity is equipped with a display screen showing the solution aspiration dose, and a removable battery is also installed on the outside of the cavity. A switch for controlling the second motor is installed on the outer side of the cavity. By setting the solution aspiration range on the display screen, the switch controlling the second motor is activated. The second motor moves an appropriate distance under the control of the program to control the aspiration dose. The display screen displays the aspiration dose and the movement of the piston driven by the first motor in real time.

[0027] Furthermore, a slip ring is fixed to the outer periphery of the baffle, and the slip ring is slidably connected to the inner wall of the suction head. A spring for pulling the slip ring is fixedly connected between the top of the slip ring and the retaining ring. Positioning beads for limiting the slip ring are opened on both side walls of the suction head. A pull rod is connected to the side of the positioning bead facing outward of the suction head. At the same time, a limiting groove that can cooperate with the positioning bead is opened on the side of the slip ring. The bottom of the outer cylinder is open, and a plug for blocking the bottom of the outer cylinder is installed at the bottom opening. Under normal conditions, the slip ring drives the baffle. Block the outlet end of the outer cylinder. When the test liquid with strong force enters the baffle through the bottom of the suction head, the baffle will be pushed up by the test liquid, exposing the outer cylinder. At this time, some of the liquid will enter the outer cylinder. When the baffle is pushed up, the limiting groove on the side of the slip ring will be locked by the positioning bead. After the test liquid is completely drawn, pull the lever out by hand. At this time, the positioning bead will be pulled out of the limiting groove, and the slider will return to its original position under the action of the spring, sealing the outer cylinder. Finally, pull out the plug blocking the outer cylinder and take out the test liquid that is stuck in the outer cylinder. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the suction head of the present invention;

[0029] Figure 2 This is a schematic diagram of the lower part of the sample dispensing gun cavity of the present invention;

[0030] Figure 3 This is a schematic diagram of Embodiment 2 of the present invention;

[0031] Figure 4 This is a schematic diagram of the upper part of the sample dispensing gun cavity of the present invention;

[0032] Figure 5 This is a schematic diagram of the display screen of the present invention;

[0033] Figure 6 This is a schematic diagram of the baffle of the present invention.

[0034] The reference numerals in the accompanying drawings include:

[0035] Suction head 1, outer cylinder 1-1, retaining ring 1-2, sealing rubber 1-3, slip ring 1-4, spring 1-5, positioning bead 1-6, pull rod 1-7, limiting groove 1-8, filter element 2, baffle 3, cavity 4, fixing frame 4-1, expansion cylinder 5, hook 5-1, screw 6, push plate 6-1, guide post 7, bevel gear 8, rotating rod 8-1, cylinder 8-2, air inlet pipe 9, piston 10, air ring 10-1, partition 10-2, push switch 10-3, second motor 11, first motor 12, display screen 13. Detailed Implementation

[0036] The following detailed description illustrates the specific implementation method:

[0037] With attachment Figure 2 For example, in the attached diagram, the sleeve is located on the right side of cavity 4, which serves as the directional reference.

[0038] Example 1 is basically as shown in the attached document. Figure 1 Appendix Figure 2 Appendix Figure 4 Appendix Figure 5 and attached Figure 6 As shown:

[0039] During the solution transfer process, staff will need to use a pipette and pipette tip 1, as shown in the attached document. Figure 1 As shown, an outer cylinder 1-1, which is connected to the suction head 1, is fixedly installed on the outer periphery of the middle part of the suction head 1. The outer cylinder 1-1 is integrally formed with the suction head 1, and the outer cylinder 1-1 occupies 1 / 2 of the total length of the suction head 1. A disc-shaped baffle 3 is horizontally fixedly installed in the middle of the suction head 1, as shown in the attached figure. Figure 5 As shown, the surface of the baffle 3 has vertically distributed through holes that are evenly distributed. These through holes are used to extract and discharge the solution.

[0040] If the operator makes an operational error, causing the solution to rise upwards inside the pipette tip 1 when it draws the solution, some of the solution will be blocked by the baffle 3, preventing the solution from entering the chamber 4 of the pipette.

[0041] A filter element 2 is installed directly above the baffle 3. The filter element 2 is inserted inside the pipette tip 1. The filter element 2 is a common component in the pipette tip 1. In order to prevent a small amount of solution from passing through the baffle 3, the filter element 2 can adsorb the solution and reduce the probability of the solution entering the pipette chamber 4.

[0042] A slip ring 1-4 is fixed to the outer periphery of the filter element 2 and the baffle 3. The slip ring 1-4 wraps around the filter element 2 and the baffle 3. A vertically arranged spring 1-5 is fixedly connected between the top of the slip ring 1-4 and the retaining ring 1-2. The springs 1-5 are symmetrically arranged. When the sample is drawn by the pipette, the sample will not rush upward. The slip ring 1-4 will block the connection between the outer cylinder 1-1 and the pipette tip 1. Once the solution rushes into the pipette tip 1, the solution will push the baffle 3 and the retaining ring 1-2 to move upward. At this time, the slip ring 1-4 will open the opening of the outer cylinder 1-1. The solution will then enter the outer cylinder 1-1 through the connection between the outer cylinder 1-1 and the pipette tip 1.

[0043] A positioning bead 1-6 is laterally arranged on the inner wall of the top of the suction head 1 to limit the movement distance of the slip ring 1-4. Simultaneously, a limiting groove 1-8 is provided on the side of the slip ring 1-4 for the positioning bead 1-6 to be inserted into. The positioning bead 1-6 is located on the left and right sides of the suction head 1. A pull rod 1-7 extending outwards from the suction head 1 is laterally fixed to the side of the positioning bead 1-6 closest to the inner wall of the suction head 1. When the solution enters the suction head 1 and pushes the baffle 3 upwards, the limiting groove 1-8 on the side of the slip ring 1-4 will be engaged by the positioning bead 1-6. -6 is locked to prevent the slip ring 1-4 from causing the baffle 3 to slide out of the suction head 1; after the solution is drawn, at this time, pull the pull rod 1-7 horizontally outward from the suction head 1 by hand. At this time, since the positioning bead 1-6 is fixedly connected to the pull rod 1-7, the positioning bead 1-6 will move horizontally towards the inner wall of the suction head 1, so as to disengage the positioning bead 1-6 from the limiting groove 1-8. Under the action of the spring 1-5, the spring 1-5 moves the slip ring 1-4 down, sealing the connection between the inner wall of the suction head 1 and the outer cylinder 1-1.

[0044] The outlet end of the top of the pipette tip 1 is an inverted conical shape. A sealing rubber 1-3 for sealing the connection between the pipette tip and the sample gun is attached to the outlet end of the pipette tip 1. At the same time, an annular retaining ring 1-2 is provided on the inner side wall of the top of the pipette tip 1. The retaining ring is fixedly connected to the inside of the pipette tip. The surface of the retaining ring 1-2 is covered with anti-slip rubber. When the sample gun is connected to the pipette tip 1, the bottom end of the sample gun will be locked in the lower part of the retaining ring 1-2 to realize the connection between the sample gun and the pipette tip 1. At the same time, the anti-slip rubber can prevent the sample gun from sliding when connected to the pipette tip 1.

[0045] As attached Figure 2As shown, an expandable expansion cylinder 5 is installed at the bottom of the sample gun cavity 4. The expansion cylinder 5 consists of four expansion petals that can produce elastic deformation. At the bottom end of each expansion petal, there is a hook 5-1 that is raised upward. The hook 5-1 is integrated with the expansion petal. The hook 5-1 can lock the lower part of the retaining ring 1-2 to realize the connection between the suction head 1 and the sample gun. The expansion cylinder 5 has a cross-section that is narrower at the top and wider at the bottom. A disc-shaped fixing frame 4-1 is fixedly connected to the top of the expansion cylinder 5. The outer periphery of the fixing frame 4-1 is fixedly connected to the inner wall of the cavity 4. At the same time, a screw 6 is vertically installed in the middle of the expansion cylinder 5. The inside of the screw 6 is hollow. The bottom end of the screw 6 is threadedly connected to a push plate 6-1 that can move up and down. The push plate 6-1 is placed in the center of the expansion cylinder 5. The top surfaces of the push plate 6-1 are vertically installed on both sides, and the guide posts 7 that can be freely extended and retracted are installed on both sides. The top of the guide posts 7 is fixedly connected to the bottom surface of the fixing frame 4-1. The rotation of the screw 6 drives the push plate 6-1 to move up and down on the inner wall of the expansion cylinder 5, thereby expanding and contracting the expansion cylinder 5.

[0046] As attached Figure 2 As shown, a bevel gear 8 is fixedly installed on the top surface of the screw 6. One end of the bevel gear 8 is fixed to the screw 6, and a rotating rod 8-1 is installed laterally on the other end. One end of the rotating rod 8-1 extends outward from the cavity 4. A cylinder 8-2 is clamped at the end of the rotating rod 8-1 that extends out of the cavity 4. The surface of the cylinder 8-2 is provided with anti-slip texture. By turning the cylinder 8-2 by hand, the rotating rod also rotates clockwise along with the cylinder. When the rotating rod rotates clockwise, it drives the bevel gear to rotate. Driven by the bevel gear 8, the push plate 6-1 can move back and forth on the screw. Therefore, by turning the cylinder by hand, the movement distance of the push plate can be controlled.

[0047] When it is necessary to connect the cavity 4 of the dispensing gun and the pipette tip 1, place the bottom end of the expansion tube 5 inside the pipette tip 1. Then, by turning the sleeve clockwise by hand, the sleeve drives the bevel gear 8 to rotate, which in turn drives the push plate 6-1 to move upward, expanding the expansion tube 5. At this time, the hook 5-1 on the outer periphery of the bottom of the expansion tube 5 will be locked under the retaining ring 1-2, firmly locking the pipette tip 1, thus achieving the connection between the pipette tip 1 and the dispensing gun. During operation, the operator does not need to use the traditional pressing method to connect the pipette tip 1 and the dispensing gun, avoiding damage to the cavity 4 of the dispensing gun or the pipette tip 1 during the pressing process.

[0048] As attached Figure 4As shown, a pushing device is provided on the upper part of the sample dispensing gun cavity 4. The pushing device is a vertically arranged second motor 11, which is a lead screw motor. The lead screw of the second motor 11 is movably connected to the top of the sample dispensing gun cavity. The bottom end of the lead screw extends into the cavity 4. A piston 10 that can move up and down is fixedly connected to the bottom end of the lead screw. A detachable air ring 10-1 is installed on the outer periphery of the side of the piston 10. A disc-shaped partition 10-2 is provided below the piston 10. The partition 10-2 is fixedly installed inside the cavity 4. A sealed space is formed between the piston 10 and the partition 10-2. An air inlet pipe 9 is vertically installed in the middle of the partition 10-2. The air inlet pipe 9 extends into the lower part of the cavity 4 and vertically passes through the middle of the screw 6. A gap is left between the air inlet pipe 9 and the interior of the screw 6 to prevent the screw 6 from affecting the air inlet pipe 9 during rotation.

[0049] A display screen 13 is installed on the sample gun housing to display solution aspiration dosage information and piston 10 movement position. A switch for controlling the start of the second motor 11 is installed below the display screen 13. A removable battery (not shown in the figure) is also installed on the sample gun housing. The motor can power the display screen 13 and the second motor 11.

[0050] The specific implementation process of Example 1 is as follows:

[0051] When it is necessary to transfer the solution using a pipette, insert the expansion tube 5 located at the bottom of the pipette into the pipette tip 1. At this time, rotate the cylinder 8-2 by hand. The cylinder 8-2 drives the push plate 6-1 to move upward, expanding the expansion tube 5. When the hook 5-1 of the expansion tube 5 is engaged below the retaining ring 1-2, release the cylinder 8-2. At this time, the connection between the pipette and the pipette tip 1 is completed.

[0052] After the pipette is connected to the pipette tip 1, turn on the switch located below the display screen 13. The second motor 11 starts and drives the piston 10 to move downward. At this time, the gas in the cavity below the piston 10 is discharged from the air inlet pipe 9. When it is necessary to aspirate the solution, the second motor 11 drives the piston 10 to move upward and draw the solution into the pipette tip 1. After the solution is completely drawn, move the pipette and start the second motor 11. The second motor 11 drives the piston 10 to move downward and discharge the solution. At this time, the transfer of the solution is completed.

[0053] The method of using a sample dispenser includes the following steps:

[0054] S1. Take out the pipette, hold the pipette in your hand, and connect the bottom of the pipette to the pipette tip 1 for drawing the solution;

[0055] S2. Adjust the amount of solution to be drawn into pipette tip 1 on the pipette, and move the pipette connected to pipette tip 1 to directly above the solution;

[0056] S3. At this point, insert pipette tip 1 into the extracted solution and submerge the bottom 2 / 3 of pipette tip 1 in the solution. Then, activate the push device inside the pipette to draw the solution into pipette tip 1.

[0057] S4. Transfer the solution temporarily drawn into pipette tip 1 to the container where the liquid is added, and at this time the pushing device in the pipette will slowly flow the solution out;

[0058] S5. After the solution has drained completely from the pipette tip 1, move the pipette directly above the container holding the contaminated pipette tip 1, detach the pipette tip 1 from the pipette, and discard the pipette tip 1 into the container holding the contaminated pipette tip 1.

[0059] Example 2:

[0060] The difference from Embodiment 1 described above is that, as shown in the appendix... Figure 3 As shown, a first motor 12 for driving the screw 6 to rotate is installed in the middle of the screw 6. The first motor 12 is a lead screw stepper motor. The two sides of the first motor 12 are fixedly connected to the inner side wall of the cavity 4. At the same time, a push switch 10-3 for controlling the start of the first motor 12 is installed on the surface of the partition 10-2. The push switch 10-3 is turned on by pressing once and turned off by pressing again.

[0061] The specific implementation process of Example 2 is as follows:

[0062] When piston 10 moves downward to partition 10-2, the push switch 10-3 on partition 10-2 is squeezed. At this time, the first switch is activated, locking hook 5-1 with retaining ring 1-2 on pipette tip 1, connecting the pipette to pipette tip 1. The movement of the screw of the second motor 11 is controlled by the program, thereby controlling the amount of solvent entering pipette tip 1. After the pipette draws the solution into pipette tip 1, the solution needs to be discharged into another container. The second motor 11 is activated, driving piston 10 to move downward. When the bottom end of piston 10 contacts push switch 10-3, piston 10 stops moving downward. At this time, a small amount of solvent remains in pipette tip 1. The pipette is moved above the medical waste bin, and the second motor 11 is activated. The second motor 11 continues to move downward and squeezes push switch 10-3. Push switch 10-3 controls the screw of the first motor 12 to rotate counterclockwise, thereby moving push plate 6-1 downward, disconnecting pipette tip 1 from pipette, and pipette tip 1 is discarded.

[0063] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A pipette, comprising a cavity for transferring a solution and a pipette tip for transferring the solution, characterized in that: The outer wall of the suction head is provided with an outer cylinder that is connected to the inner cylinder. A baffle is horizontally installed inside the suction head to prevent solution from entering the cavity. A clamping mechanism for clamping the suction head is installed at the bottom of the cavity. The clamping mechanism is an expansion cylinder that can produce elastic deformation. The bottom end of the expansion cylinder is provided with a hook that can be connected to the upper part of the suction head. The inner wall of the upper part of the suction head is provided with a raised retaining ring that can cooperate with the hook. A slip ring is fixed to the outer periphery of the baffle. The slip ring is slidably connected to the inner wall of the suction head. A spring for pulling the slip ring is fixedly connected between the top of the slip ring and the retaining ring. Positioning beads for limiting the slip ring are opened on both sides of the suction head. A pull rod is connected to the side of the positioning bead facing the outside of the suction head. At the same time, a limiting groove that can cooperate with the positioning bead is opened on the side of the slip ring. The bottom of the outer cylinder is open. A plug for blocking the bottom of the outer cylinder is installed at the bottom opening of the outer cylinder.

2. The sample dispensing gun according to claim 1, characterized in that: The surface of the retaining ring is covered with anti-slip rubber, the top of the suction head is an inverted conical opening, and the inner wall of the top of the suction head is covered with an inverted conical sealing rubber.

3. A sample dispensing gun according to claim 1, characterized in that: The cavity is equipped with a fixing frame for fixing the expansion cylinder. The outer periphery of the fixing frame is fixed to the inner side wall of the cavity, and the bottom end of the fixing frame is fixedly connected to the top end of the expansion cylinder as a whole.

4. A sample dispensing gun according to claim 1, characterized in that: A screw is vertically installed in the middle of the expansion cylinder, and a pusher plate that can move up and down is threaded onto the screw. The outer peripheral sidewall of the pusher plate can contact the inner sidewall of the expansion cylinder. A drive device is connected to the top of the screw.

5. A sample dispensing gun according to claim 4, characterized in that: The driving device is a bevel gear. One end of the bevel gear is fixed to the top of the screw, and the other end of the bevel gear is fixedly connected to a rotating rod. The rotating rod extends laterally outward from the cavity, and a rotatable cylinder is fitted on the side of the rotating rod that extends out of the cavity.

6. A sample dispensing gun according to claim 4, characterized in that: The push plate is vertically fixedly installed with retractable guide posts on both sides, and the top of the guide posts is fixedly connected to the bottom of the fixed frame.

7. A sample dispensing gun according to claim 4, characterized in that: The driving device is a first motor that can drive the screw to rotate. The middle part of the screw has a vertical and hollow air intake pipe. There is no contact between the air intake pipe and the inner wall of the screw. The top of the air intake pipe extends to the upper part of the cavity.

8. A sample dispensing gun according to claim 1, characterized in that: A pushing device is installed at the top inside the cavity. The pushing device is a vertically movable pressure rod. A piston is connected to the bottom end of the pressure rod, and a second motor is connected to the top of the pressure rod. A sealing gas ring is provided on the outer periphery of the piston. A horizontal partition is installed below the piston and is fixedly connected to the inner wall of the cavity. The top of the air inlet pipe runs vertically through the partition and is fixedly connected to the partition. A push switch for controlling the start of the first motor is installed on the top surface of the partition. A display screen for displaying the solution aspiration dosage is installed on the outside of the cavity. A removable battery is also installed on the outside of the cavity.

9. A sampling gun and its method of use according to claim 1, characterized in that, Includes the following steps: S1. Take out the pipette, hold the pipette in your hand, and connect the bottom of the pipette to the pipette tip for drawing the solution; S2. Adjust the amount of solution to be drawn into the pipette tip on the pipette, and move the pipette with the pipette tip connected to it directly above the solution; S3. At this point, insert the pipette tip into the extracted solution and submerge the bottom 2 / 3 of the pipette tip in the solution. Then, activate the push device inside the pipette to draw the solution into the pipette tip. S4. Transfer the solution temporarily drawn into the pipette tip to a position directly above the container where the liquid is added. At this point, the pusher in the pipette will slowly draw the solution out. S5. After the solution has drained completely from the pipette tip, move the pipette directly above the container holding the contaminated pipette tip, detach the pipette tip from the pipette, and discard the pipette tip in the container holding the contaminated pipette tip.

Images