Disposable accurate quantitative dropper

Abstract

The utility model discloses a disposable accurate quantitative dropper which comprises a quantitative tube body, one end of the quantitative tube body is connected with a quantitative drip nozzle, the other end of the quantitative drip nozzle is connected with a drip nozzle protection end cover, the inner wall of the other end of the quantitative tube body is connected with a pressing end cover through a reset spring, and the inner wall of one end of the pressing end cover is connected with a quantitative piston through an embedded groove. One end of the quantitative piston is connected with the inner wall of the quantitative pipe body through a piston sealing ring, the inner wall of one end of the quantitative pipe body is connected with a pressing end cover through an anti-disengaging clamping groove, a piston matching cavity is formed in one end of the inner wall of the quantitative pipe body, a guide-in groove is formed in one end of the piston matching cavity, and an automatic filling hanging table is arranged on the outer wall of the quantitative pipe body. The liquid sample can be accurately and quantitatively extracted through hand holding and fingertip pressing, and the quantitative sampling problem related to biological, environmental and chemical experiments and the like is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid specimen sampling equipment, in particular to a disposable precise quantitative dropper. Background Art

[0002] The amount of liquid dripped from a disposable dropper is affected by factors such as the concentration tension of the liquid, the size of the liquid hanging area at the nozzle, the force and speed of squeezing the tube wall, and changes in ambient temperature, which will cause the same dropper to drip different amounts each time.

[0003] Disposable quantitative droppers are commonly used tools for rapid droplet testing in hospitals, scientific research institutions, third-party testing units and other departments. Currently, most droplet tests require the use of pipettes, Pasteur pipettes, eye dropper bottles, antigen test droppers, glass droppers and other customized droppers. Existing disposable droppers on the market all squeeze the tube body to change the volume inside the tube and increase the pressure inside the tube before dripping. The disadvantage is that the amount of liquid dripped out varies. Because the force of squeezing the tube body by fingers is difficult to control, the amount of liquid dripped out is different, and there is a high probability of continuous dripping, resulting in inaccurate total amount of liquid required for testing. Other manufacturers with patents for controlling the amount of dripping produce droppers, because the dropper drips liquid after squeezing the quantitative vesicle, but because the amount of liquid dripped is small, the air cannot automatically reflux, and the air pressure in the tube loses balance, resulting in difficulty in dripping the second drop of liquid and the size of the area of ​​the dripper mouth does not match the corresponding drop amount. Because the error in the amount of each drop of liquid dripped from the dropper is large, it will lead to errors in the test results, resulting in false negatives and false positives in the test report. The impact of such test results is immeasurable, so how to solve the above-mentioned problems has become a difficult problem that needs to be solved urgently. Utility Model Content

[0004] The purpose of the utility model is to provide a disposable precise quantitative dropper which has a simple structure, is easy to operate and use, can achieve precise quantitative sampling of liquid samples by holding and pressing with fingertips, and solves the quantitative sampling problems related to biological, environmental and chemical experiments.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a disposable precise quantitative dropper, comprising a quantitative tube body, a quantitative drip nozzle connected to one end of the quantitative tube body, a drip nozzle protection end cap connected to the other end of the quantitative drip nozzle, the inner wall of the other end of the quantitative tube body is connected to a pressing end cap through a reset spring, the inner wall of one end of the pressing end cap is connected to a quantitative piston through an embedded groove, one end of the quantitative piston is connected to the inner wall of the quantitative tube body through a piston sealing ring, the inner wall of one end of the quantitative tube body is connected to the pressing end cap through an anti-detachment groove, a piston matching cavity is provided at one end of the inner wall of the quantitative tube body, an introduction groove is provided at one end of the piston matching cavity, and an automatic filling hanging platform is provided on the outer wall of the quantitative tube body.

[0006] Preferably, a drip nozzle adapter port is provided on the inner wall of one end of the quantitative drip nozzle, a conical end head is provided on the other end of the quantitative drip nozzle, a protective end cap locking groove is provided on the outer wall of the conical end head, and a sealing ring is provided on the inner side of the quantitative drip nozzle.

[0007] Preferably, an annular anti-slip sealing groove is provided on the inner wall of the drip nozzle protection end cover, and a drip nozzle introduction groove is provided on the inner side of the drip nozzle protection end cover.

[0008] Preferably, a dust-proof introduction skirt is provided at one end of the pressing end cover, a guide introduction push rod is provided on one side of the inner wall of the dust-proof introduction skirt, the head of the guide introduction push rod has a certain curvature, and an anti-slip step is provided on the outer wall of the dust-proof introduction skirt corresponding to the anti-slip slot.

[0009] Preferably, a cylindrical end is provided at one end of the metering piston, a sealing ring groove is provided on the side of the cylindrical end, and an embedded locking end is provided at the other end of the metering piston. The cylindrical end is connected to the inner wall of the metering tube body, and the embedded locking end is connected to the embedded groove.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] (1) The utility model has a simple structure and is easy to operate and use. It can achieve accurate quantitative sampling of liquid samples by holding it or pressing it with fingertips, solving the quantitative sampling problems related to biological, environmental and chemical experiments. The device can be set to different sizes according to different demand scenarios, and can then extract and release different amounts of test liquids. The device is essentially different from the traditional syringe for filling liquid samples. The liquid sample of the device can only be filled by removing the quantitative dropper, solving the technical problems of quantitative sampling and diffusion of biological liquid samples that may be encountered during the experiment.

[0012] (2) The reset spring can ensure that the pressing end cap can be reset when it contacts the restraint of the pressing end cap, preparing for the next pressing to release the liquid. The piston cooperates with the cavity to guide the quantitative piston to move in one direction. This device is disposable and there is no cross-contamination of samples that affects the monitoring results. Secondly, the early filling process of this device can be carried out in an isolated environment, which can effectively prevent the volatilization and diffusion of biological sample liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the structure of the quantitative drip nozzle of the utility model;

[0015] Figure 3 This is a schematic diagram of the structure of the drip nozzle protection end cover of the utility model;

[0016] Figure 4 This is a schematic diagram of the structure of the pressing end cover of the utility model;

[0017] Figure 5 This is a structural schematic diagram of the quantitative piston of the utility model;

[0018] Figure 6 It is a structural schematic diagram of the quantitative tube body of the utility model.

[0019] In the figure: 1. quantitative tube body; 2. quantitative drip nozzle; 3. drip nozzle protective end cap; 4. reset spring; 5. press end cap; 6. embedded groove; 7. quantitative piston; 8. piston sealing ring; 9. anti-drop slot; 10. piston matching cavity; 11. introduction groove; 12. automatic filling hanging table; 13. drip nozzle adapter port; 14. tapered end; 15. protective end cap locking groove; 16. sealing ring; 17. annular anti-drop sealing groove; 18. drip nozzle introduction groove; 19. dustproof introduction skirt; 20. guide introduction push rod; 21. anti-drop step; 22. cylindrical end; 23. sealing ring groove; 24. embedded locking end. DETAILED DESCRIPTION

[0020] In the following description, a large number of specific details are given in order to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described. In order to enable those skilled in the art to better understand the present application scheme, the technical scheme in the embodiment of the present application will be clearly and completely described below in conjunction with the drawings in the embodiment of the present application. Obviously, the described embodiment is only an embodiment of a part of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work should fall within the scope of protection of this application.

[0021] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present 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.

[0023] like Figure 1-6As shown, a disposable precise quantitative dropper comprises a quantitative tube body 1, one end of the quantitative tube body 1 is connected to a quantitative drip nozzle 2, the other end of the quantitative drip nozzle 2 is connected to a drip nozzle protection end cap 3, the inner wall of the other end of the quantitative tube body 1 is connected to a pressing end cap 5 through a reset spring 4, the inner wall of one end of the pressing end cap 5 is connected to a quantitative piston 7 through an embedded groove 6, one end of the quantitative piston 7 is connected to the inner wall of the quantitative tube body 1 through a piston sealing ring 8, the inner wall of one end of the quantitative tube body 1 is connected to the pressing end cap 5 through an anti-drop groove 9, one end of the inner wall of the quantitative tube body 1 is provided with a piston matching cavity 10, one end of the piston matching cavity 10 is provided with an introduction groove 11, the outer wall of the quantitative tube body 1 is provided with an automatic filling hanging platform 12, the connection between the quantitative tube body and the quantitative drip nozzle can be a sealing groove connection, that is, connected through an annular groove and a raised step, or can be a close-fitting contact connection. It can also be a threaded connection. When used for normal sampling, first remove the drip nozzle protection end cover, then press the pressing end cover with your thumb to immerse the quantitative drip nozzle in the liquid, and then release the pressing end cover. The pressing end cover is reset under the action of the reset spring. When the liquid needs to be released, touch the pressing end cover downward to release the sample liquid. The amount of sample liquid released can be controlled by the pressing force as needed, and quantitative dripping can also be achieved by multiple presses. The piston matching cavity is a tubular structure, the purpose of which is to guide the quantitative piston to move in one direction. There are multiple equidistant steps on the side of the quantitative piston. After pressing once, the quantitative piston is separated from the pressing end cover and moves step by step to the other end of the piston matching cavity. The introduction groove is to guide the quantitative piston to enter, which is convenient for assembly. The piston matching cavity and the quantitative tube body of the tubular structure can be an integrated structure, or they can be manufactured separately and then re-fixed and assembled.

[0024] A drip nozzle adapter port 13 is provided on the inner wall of one end of the metering drip nozzle 2, and a conical end head 14 is provided on the other end of the metering drip nozzle 2. A protective end cover locking groove 15 is provided on the outer wall of the conical end head 14. A sealing ring 16 is provided on the inner side of the metering drip nozzle 2. The annular sealing groove and the protective end cover locking groove can also be replaced by threads. The hole of the conical end head should not be too large.

[0025] An annular anti-drop sealing groove 17 is provided on the inner wall of the drip nozzle protection end cover 3, and a drip nozzle introduction groove 18 is provided on the inner side of the drip nozzle protection end cover 3. The purpose of the drip nozzle introduction groove is to protect the quantitative drip nozzle, and the quantitative drip nozzle will not be damaged in the event of collision or falling. The drip nozzle introduction groove can facilitate the introduction of the drip nozzle into the groove.

[0026] A dustproof introduction skirt 19 is provided at one end of the pressing end cover 5, and a guide introduction push rod 20 is provided on one side of the inner wall of the dustproof introduction skirt 19. The head of the guide introduction push rod 20 is provided with a certain curvature, and an anti-slip step 21 is provided on the outer wall of the dustproof introduction skirt 19 corresponding to the anti-slip groove 9. The outer diameter of the dustproof introduction edge is smaller than the inner diameter of the quantitative tube body, and the curvature of the guide introduction push rod is set corresponding to the introduction groove. The anti-slip step reciprocates on the inner side of the anti-slip groove. The anti-slip groove is a strip structure. The purpose of the anti-slip groove is limited to preventing the pressing end cover from falling out, and does not affect the reciprocating motion of the pressing end cover.

[0027] A cylindrical end cap 22 is provided at one end of the metering piston 7, a sealing ring groove 23 is provided on the side of the cylindrical end cap 22, and an embedded locking end cap 24 is provided at the other end of the metering piston 7. The cylindrical end cap 22 is connected to the inner wall of the metering tube body 1, and the embedded locking end cap 24 is connected to the embedded groove 6. The sealing ring fixing groove matches and connects one or more piston sealing rings. The equidistant steps are triangular sections, and can also be rectangular sections or sections of other shapes. The grooves of the annular triangular sections can maintain a certain friction between the metering piston and the piston matching cavity, so that the metering piston will not fall out. The length of each equidistant step is equal to the single stroke of the piston, and pushing each step is equal to the amount of liquid that needs to drip out.

[0028] Directions:

[0029] Step 1: first remove the quantitative drip nozzle 2 and the drip nozzle protection end 3 together; Step 2: put the sample to be tested into the quantitative tube body 1; Step 3: reset the quantitative drip nozzle 2 and the drip nozzle protection end cover 3; Step 4: remove the drip nozzle protection end cover 3 alone; Step 5: hold the quantitative tube body 1 with one hand, touch the pressing end cover 5 with your finger, stop applying pressure after the pressing is blocked, and the pressing end cover 5 pushes the quantitative piston 7 downward to cause liquid to drip; Step 6: after the liquid drips, release the restraint on the pressing end cover 5, and press the end cover 5 again. The quantitative piston 7 will be automatically reset under the action of the reset spring 4, and the above action can be repeated by repeated sampling. During the pressing process, the quantitative piston 7 will be separated from the pressing end cover 5, and the pressing end cover 5 will still maintain an indirect connection with the quantitative tube body 1 through the reset spring 4, the anti-detachment slot 9 and the anti-detachment step 21, so that the pressing end cover 5 will not fall off. By pressing the disposable quantitative piston multiple times, the quantitative piston 7 will be introduced into the piston matching cavity 10 multiple times in equal amounts, thus realizing the quantitative extraction of liquid. The process of extracting the liquid will not produce air pressure difference, and continuous pressing can drip out several drops of liquid.

[0030] The above embodiments are only preferred embodiments of the present utility model and are not limitations on the technical solutions of the present utility model. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present utility model.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A disposable precise quantitative dropper, characterized by: The invention comprises a quantitative tube body (1), one end of the quantitative tube body (1) is connected to a quantitative drip nozzle (2), the other end of the quantitative drip nozzle (2) is connected to a drip nozzle protection end cover (3), the inner wall of the other end of the quantitative tube body (1) is connected to a pressing end cover (5) via a return spring (4), the inner wall of one end of the pressing end cover (5) is connected to a quantitative piston (7) via an embedded groove (6), one end of the quantitative piston (7) is connected to the inner wall of the quantitative tube body (1) via a piston sealing ring (8), the inner wall of one end of the quantitative tube body (1) is connected to the pressing end cover (5) via an anti-dropping groove (9), one end of the inner wall of the quantitative tube body (1) is provided with a piston matching cavity (10), one end of the piston matching cavity (10) is provided with an introduction groove (11), and the outer wall of the quantitative tube body (1) is provided with an automatic filling hanging platform (12).

2. The disposable precise quantitative dropper according to claim 1, characterized in that: A nozzle adapter port (13) is provided on the inner wall of one end of the metering nozzle (2), a conical end head (14) is provided on the other end of the metering nozzle (2), a protective end cover locking groove (15) is provided on the outer wall of the conical end head (14), and a sealing ring (16) is provided on the inner side of the metering nozzle (2).

3. The disposable precise quantitative dropper according to claim 1, characterized in that: An annular anti-slip sealing groove (17) is provided on the inner wall of the drip nozzle protection end cover (3), and a drip nozzle introduction groove (18) is provided on the inner side of the drip nozzle protection end cover (3).

4. The disposable precise quantitative dropper according to claim 1, characterized in that: A dustproof introduction skirt (19) is provided at one end of the pressing end cover (5), a guide introduction push rod (20) is provided on one side of the inner wall of the dustproof introduction skirt (19), a head of the guide introduction push rod (20) is provided with a certain curvature, and an anti-slip step (21) is provided on the outer wall of the dustproof introduction skirt (19) corresponding to the anti-slip slot (9).

5. The disposable precise quantitative dropper according to claim 1, characterized in that: A cylindrical end cap (22) is provided at one end of the metering piston (7), a sealing ring groove (23) is provided on the side of the cylindrical end cap (22), and an embedded locking end cap (24) is provided at the other end of the metering piston (7), the cylindrical end cap (22) is connected to the inner wall of the metering tube body (1), and the embedded locking end cap (24) is connected to the embedded groove (6).

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