Liquid separation device capable of continuously adding samples

Abstract

The utility model discloses a liquid separation device capable of continuously adding samples. The liquid separation device comprises an outer sleeve; a tip; a middle sleeve; the inner sleeve is connected with a button; a plurality of ring teeth are distributed on the periphery of the ring tooth column at equal intervals, the lower surfaces of the ring teeth are provided with slopes, and the ring tooth column is arranged in the inner sleeve in a penetrating mode; one end of the annular tooth column is fixedly inserted into the button, the other end of the annular tooth column is fixedly connected with the piston column, when the button is pressed, the annular tooth column pushes the piston column to discharge liquid in the suction head outwards in an equivalent mode, and a reset spring used for jacking up the inner sleeve to achieve repeated sample adding is arranged in the middle sleeve. According to the utility model, the middle sleeve and the linkage part of the piston column form a rotatable disengagement structure through the clamping hook, meanwhile, the annular teeth on the annular tooth column can be in contact with the elastic teeth, and a damping hand feeling can be generated by pressing the button, so that the filling accuracy can be improved, and the structure does not need to suck liquid repeatedly; the device is simple, practical and low in cost, and meets the sample adding uniformity requirement.

Description

Technical Field:

[0001] The utility model relates to the technical field of liquid pipetting and liquid separation, and particularly refers to a liquid separation device capable of continuous sample addition. Background Art:

[0002] As a tool for laboratory pipetting, liquid separation, and adding experimental materials, the dispenser (needle) is widely used because of its simplicity, practicality, and flexible operation, and has become an essential instrument in various types of laboratories, especially in biomedical and chemical laboratories. Traditional samplers (needles) mainly have single-head and multi-head styles. The single-head style sucks and adds once. The multi-head style sucks once and adds samples once. Due to its multi-channel design, liquid enters different sample addition pools through different channels to achieve multi-well sample addition.

[0003] Currently, a relatively common single-head sampling needle on the market, for example: the Chinese utility model patent application with the patent publication number CN204495598U discloses a sampling needle, which includes: a sampling needle body, and the sampling needle body is provided with a hollow needle tube part and a solid piercing head; the hollow needle tube part is provided with a through hole, and the inner hole of the hollow needle tube is communicated with the outside through the through hole; the shape of the solid piercing head is conical or pyramidal. It can effectively pierce the rubber stopper of the sampling bottle or blood collection tube, and while effectively piercing, it reduces the damage to the bottle stopper part. A through hole is arranged at the connection between the solid piercing head and the hollow needle tube part, effectively utilizing all the inner hole parts for accurate sampling. The through hole arranged on the side wall of the sampling needle can also prevent the needle tube from being blocked when the sampling needle pierces the rubber stopper. The transfer and addition of blood samples or other liquids are completed through the through hole, making the automated sampling more accurate and efficient in automated sampling applications.

[0004] However, this existing sampling needle still has the following deficiencies:

[0005] In this technical solution, the above-mentioned sampling needle needs to repeat the liquid suction and addition actions, and it is difficult to meet the requirements of sample addition uniformity. In the case of the increasingly batch operation in modern laboratories, the repetitive labor of laboratory technicians has doubled, and the efficiency is low, which can no longer meet the needs of modern laboratories. Therefore, there is an urgent need for a dispenser with a simple structure, low cost, and meeting the requirements of sample addition uniformity.

[0006] In view of this, the inventor of the present invention proposes the following technical solution. Content of the Utility Model:

[0007] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a liquid separation device capable of continuous sample addition.

[0008] In order to solve the above technical problems, the utility model adopts the following technical solutions: a liquid dispensing device capable of continuous sample addition, comprising: an outer sleeve, the inner wall of which is provided with at least one radially distributed positioning groove; a suction head, which is fixed to the lower end of the outer sleeve and is used to accommodate external samples, the lower end of the suction head is provided with a liquid inlet, a piston column for extracting samples is inserted into the suction head, and a laterally distributed linkage part is provided on the piston column; a middle sleeve, which can be slidably inserted into the outer sleeve, the outer wall of the middle sleeve is protruded with at least one protrusion for rotational positioning with the positioning groove, and the lower end surface of the middle sleeve is protruded with There is at least one hook for rotating and engaging with the linkage part; an inner sleeve, which is telescopically installed in the middle sleeve, and a button is connected to the inner sleeve; a ring tooth column, which has a plurality of ring teeth evenly distributed around it, the lower surface of the ring teeth has an inclined surface and a gap is formed between two adjacent ring teeth, and the ring tooth column is inserted into the inner sleeve; one end of the ring tooth column is fixedly inserted in the button, and the other end of the ring tooth column is fixedly connected to the piston column. When the button is pressed, the ring tooth column pushes the piston column to discharge the liquid in the pipette tip outward in equal amounts, and a reset spring for lifting the inner sleeve to achieve repeated sample addition is arranged in the middle sleeve.

[0009] Furthermore, in the above technical solution, a limiting through hole for the ring gear column to pass through is opened in the middle sleeve, and the limiting through hole also protrudes upward to form a convex ring, and one end of the reset spring is fixedly sleeved on the convex ring.

[0010] Furthermore, in the above technical solution, elastic teeth with elasticity are also formed on the convex ring, and the elastic teeth include: an elastic section and hook teeth integrally formed with the elastic section and capable of meshing with the ring teeth of the ring tooth column.

[0011] Furthermore, in the above technical solution, the positioning groove includes a sliding groove radially distributed along the inner wall of the outer sleeve and a positioning sub-groove perpendicularly opened to the sliding groove and used for the protrusion to be rotatably engaged, and the outer sleeve is provided with an observation hole at the positioning sub-groove, which passes through the positioning sub-groove and is used to observe the positioning sub-groove, and a first buckle hole is also provided at the upper end of the middle sleeve.

[0012] Furthermore, in the above technical solution, a first buckle for connecting and fixing with the first buckle hole is formed on the upper end of the inner sleeve, and a second buckle hole is formed on the inner sleeve above the first buckle.

[0013] Furthermore, in the above technical solution, a plurality of elastic petal-shaped bodies that can produce elastic deformation are formed on the lower end surface of the inner sleeve. The elastic petal-shaped bodies are clamped in the gap and axially limit the ring tooth column, and the inner wall of the elastic petal-shaped body has a slope. The lower surface of the ring tooth abuts against the inner wall of the elastic petal-shaped body. When the ring tooth column moves downward, the elastic petal-shaped body is driven by the ring teeth to open from the inside to the outside.

[0014] Furthermore, in the above technical solution, the button is formed with a second latching buckle for connection and fixation with the second latching hole, and the button is also formed with a lifting portion that is larger than the outer sleeve and is used for lifting by the human hand.

[0015] Furthermore, in the above technical solution, the linkage portion of the piston column includes a first extension portion extending horizontally, a second extension portion extending horizontally and located on the same horizontal line as the first extension portion, and a third latching groove located between the first extension portion and the second extension portion. The end of the first extension portion is formed with a first slider for sliding connection with the sliding groove, the end of the second extension portion is formed with a second slider for sliding connection with the sliding groove, and the lower end portion of the piston column is formed with a sealing flap for forming a pumping piston.

[0016] Furthermore, in the above technical solution, the lower end portion of the ring gear column is formed with a latching portion for fixed latching with the third latching groove.

[0017] Furthermore, in the above technical solution, the lower end portion of the outer sleeve is formed with a first clamping portion for fixed connection with the suction head. Correspondingly, the suction head is formed with a second clamping portion for connection with the first clamping portion.

[0018] After adopting the above technical solution, the present utility model has the following beneficial effects compared with the prior art: In the present utility model, a rotatable detachment structure is formed between the middle sleeve and the linkage portion of the piston column through the hook. That is, after pumping to the required liquid volume position, rotating the button can separate the middle sleeve from the hook. When pressing the button again, the button will drive the inner sleeve. Further, the inner sleeve will drive the ring gear column to move downward through the elastic flap, and the ring gear column will synchronously push the piston column downward, thereby extruding the sample in the suction head to complete one-time sample addition. At the same time, the teeth on the ring gear column will contact the elastic teeth, and pressing the button can generate a damping feel, which can improve the accuracy during filling. Such a structure does not require repeated liquid suction, is simple and practical, has a low cost, and meets the requirements of sample addition uniformity. Description of the Drawings:

[0019] Figure 1 is a three-dimensional schematic diagram of the present utility model;

[0020] Figure 2 is a cross-sectional schematic diagram of the present utility model;

[0021] Figure 3 is Figure 2 an enlarged view at A;

[0022] Figure 4 is a cross-sectional view of the present utility model in the use state;

[0023] Figure 5It is a schematic assembly diagram of the piston column and the middle sleeve in the present utility model;

[0024] Figure 6 It is a three-dimensional schematic diagram of the piston column in the present utility model;

[0025] Figure 7 It is a three-dimensional schematic diagram of the ring gear column in the present utility model.

[0026] Figure 8 is Figure 4 an enlarged view at B. Specific embodiments:

[0027] The present utility model will be further described below in conjunction with specific embodiments and the drawings.

[0028] See Figures 1 to 8 As shown, it is a liquid dispensing device capable of continuous sample addition, which includes: an outer sleeve 1, with at least one radially distributed positioning groove 11 formed on its inner wall; a pipette tip 4, which is fixed to the lower end of the outer sleeve 1 and is used to accommodate an external sample. The lower end of the pipette tip 4 is provided with a liquid inlet 41. A piston column 6 for sucking the sample is inserted into the pipette tip 4, and a laterally distributed linkage portion 61 is provided on the piston column 6; a middle sleeve 2, which is slidably inserted into the outer sleeve 1. At least one protrusion 21 for rotational positioning with the positioning groove 11 is formed on the outer wall of the middle sleeve 2, and at least one hook 22 for rotational engagement with the linkage portion 61 is formed on the lower end surface of the middle sleeve 2; an inner sleeve 3, which is telescopically installed in the middle sleeve 2, and a button 7 is connected to the inner sleeve 3; a ring gear column 5, with a number of ring gears 51 equally distributed around its circumference. The lower surface of the ring gear 51 has an inclined surface. The ring gear column 5 is inserted into the inner sleeve 3; one end of the ring gear column 5 is fixedly inserted into the button 7, and the other end of the ring gear column 5 is fixedly connected to the piston column 6. When the button 7 is pressed, the ring gear column 5 pushes the piston column 6 to equally discharge the liquid in the pipette tip 4 outward. A return spring 8 for jacking up the inner sleeve 3 to achieve repeated sample addition is arranged in the middle sleeve 2.

[0029] In the present utility model, a rotatable detachment structure is formed between the middle sleeve 2 and the linkage portion 61 of the piston column 6 through the hook 22, that is, after being pulled to the required liquid volume position, by rotating the button 7, the middle sleeve 2 can be disengaged from the hook 22. When the button 7 is pressed again, the button 7 will drive the inner sleeve 3. Further, the inner sleeve 3 will drive the ring gear column 5 to move downward through the elastic flap 33, and the ring gear column 5 will synchronously push the piston column 6 downward, thereby squeezing out the sample in the pipette tip 4 to complete one sample addition. At the same time, the ring gear 50 on the ring gear column 5 will contact the elastic tooth 241, and pressing the button 7 can generate a damping feel, which can improve the accuracy during filling. Such a structure is simple and practical, low in cost, and meets the requirements of sample addition uniformity.

[0030] SeeFigure 2 As shown in Figure 3 Figure 3 a limiting through hole 23 for the ring gear column 5 to pass through is formed in the middle sleeve 2, and a convex ring 24 is formed by protruding upward from the limiting through hole 23. One end of the return spring 8 is fixedly sleeved on the convex ring 24.

[0031] Elastic teeth 241 with elasticity are also formed on the convex ring 24. The elastic teeth 241 include: an elastic section 2410 and a hook tooth 2411 integrally formed with the elastic section 2410 and capable of meshing with the ring teeth 51 of the ring gear column 5.

[0032] The positioning groove 11 includes a sliding groove 110 radially distributed along the inner wall of the outer sleeve 1 and a positioning sub-groove 120 vertically opened and used for the rotating clamping of the protrusion 21. An observation hole 130 is formed in the outer sleeve 1 at the positioning sub-groove 120. The observation hole 130 penetrates the positioning sub-groove 120 and is used for observing the positioning sub-groove 120. A first buckling hole 25 is also formed at the upper end of the middle sleeve 2.

[0033] A first pull buckle 31 for connecting and fixing with the first buckling hole 25 is formed at the upper end of the inner sleeve 3. A second buckling hole 32 is also formed in the inner sleeve 3 above the first pull buckle 31. Here,

[0034] see Figure 8 As shown, a plurality of elastic flap-like bodies 33 capable of elastic deformation are formed on the lower end surface of the inner sleeve 3. The elastic flap-like bodies 33 are clamped in the gap 511 and axially limit the ring gear column 5. The inner wall of the elastic flap-like body 33 has an inclined surface. The lower surface of the ring tooth 51 abuts against the inner wall of the elastic flap-like body 33. When the ring gear column 5 moves downward, the elastic flap-like body 33 is driven by the ring tooth 51 to open from the inside to the outside. Here, the elastic flap-like body 33 is clamped in the gap 511 formed between two adjacent ring teeth 50. When the liquid separation device is in a stretched state (i.e., the piston column 6 is stretched and the liquid is drawn into the suction head 4), pressing the button 7 at this time drives the ring gear column 5 to move downward. The inclined surface on the lower surface of the ring tooth 51 will abut against the inclined surface on the inner wall of the elastic flap-like body 33 and drive the elastic flap-like body 33 to open, so that the ring gear column 5 can pass through between a plurality of elastic flap-like bodies 33. At the same time, after a ring tooth 51 passes through, the elastic flap-like body 33 will reset and be clamped in the next gap 511. Through such a precisely positioned structure, continuous, multiple, and quantitative sample addition is realized.

[0035] A second pull buckle 72 for connecting and fixing with the second buckling hole 32 is formed on the button 7. A lifting part 73 larger than the outer sleeve 1 and used for the human hand to lift is also formed on the button 7. Here, the lifting part 73 makes the button 7 more convenient to rotate and increases the convenience of operation.

[0036] seeFigure 5 and Figure 6 As shown in Figure 6 , the linkage part 61 of the piston column 6 includes a first extension part 611 extending horizontally, a second extension part 612 extending horizontally and located on the same horizontal line as the first extension part 611, and a third buckling groove 613 located between the first extension part 611 and the second extension part 612. A first slider 614 for sliding connection with the chute 110 is formed at the tail end of the first extension part 611, a second slider 615 for sliding connection with the chute 110 is formed at the tail end of the second extension part 612, and a sealing flanging 62 for forming a pumping piston is formed at the lower end of the piston column 6. Here, the structure between the hook 22 and the first extension part 611 and the second extension part 612 is rotatable and detachable, that is: when the button 7 drives the middle sleeve 2 to rotate, the hook 22 will rotate out of the first extension part 611 and the second extension part 612, separating the piston column 6 from the middle sleeve 2.

[0037] A buckling part 53 for fixedly buckling with the third buckling groove 613 is formed at the lower end of the ring gear column 5. Here, the ring gear column 5 is fixedly connected to the piston column 6 through the buckling part 53, enabling the ring gear column 5 to better drive the piston column 6 for sampling.

[0038] A first clamping part 101 for fixedly connecting with the suction head 4 is formed at the lower end of the outer sleeve 1. Correspondingly, a second clamping part 42 for connecting with the first clamping part 101 is formed on the suction head 4.

[0039] To sum up, in the present utility model, a rotatable and detachable structure is formed between the middle sleeve 2 and the linkage part 61 of the piston column 6 through the hook 22, that is, after pumping to the required liquid volume position, by rotating the button 7, the middle sleeve 2 can be separated from the hook 22. When the button 7 is further pressed, the button 7 will drive the inner sleeve 3. Further, the inner sleeve 3 will drive the ring gear column 5 to move downward through the elastic flap 33. The ring gear column 5 will synchronously push the piston column 6 downward, thereby extruding the sample in the suction head 4 to complete one sampling. At the same time, the ring teeth 50 on the ring gear column 5 will contact the elastic teeth 241, and pressing the button 7 can generate a damping feel, which can improve the accuracy during filling. Such a structure does not require repeated liquid suction, is simple and practical, has a low cost, and meets the requirements of sampling uniformity. In addition, after releasing the button 7, the return spring 8 pushes the inner sleeve 3 to move upward and reset. Due to the limiting effect of the elastic teeth 241, the ring gear column 5 remains stationary; when the button 7 is pressed again, the inner sleeve 3 will continue to drive the ring gear column 5 to move downward through the elastic flap 33, thereby pushing the piston column 6 downward to complete one sampling again. Each time the button 7 is pressed, one sampling is completed, thus realizing continuous multiple samplings.

[0040] The usage method of the present utility model:

[0041] 1. Pull the button 7, drive the inner sleeve 3 to move upward through the second buckle 72, and the inner sleeve 3 drives the middle sleeve 2 to move upward through the first buckle 31.

[0042] 2. The middle sleeve 2 drives the piston rod 6 to move upward through the hook 22, and the piston rod 6 forms a piston to pump and extract the sample through the sealing edge 62.

[0043] 3. After the pumping reaches the required liquid volume position (at the positioning slot 120), turn the button to disengage the hook 22 (as shown in Figure 5 ), and at the same time, the protrusion 21 will rotate synchronously and snap into the positioning slot 120 to position the middle sleeve 2.

[0044] 4. Press the button 7 in batches to push the inner sleeve 3 forward. The inner sleeve 3 drives the ring gear column 5 forward through the hook 22 and pushes the piston rod 6 forward to complete one sample injection.

[0045] 5. Release the button 7, and the return spring 8 pushes up the inner sleeve 3 to reset. Continue to press the button 7 and repeat step 4 to complete repeated sample addition.

[0046] Certainly, the above are only specific embodiments of the present invention, and are not intended to limit the scope of implementation of the present invention. Any equivalent changes or modifications made according to the structure, features, and principles described in the scope of the patent application of the present invention shall be included within the scope of the patent application of the present invention.

Claims

1. A liquid separation device capable of continuous sample addition, characterized in that, Comprising: An outer sleeve (1) having at least one radially distributed positioning groove (11) formed in its inner wall; A suction head (4) fixed to the lower end of the outer sleeve (1) and used to accommodate an external sample. The lower end of the suction head (4) is provided with a liquid inlet (41). A piston rod (6) for extracting the sample is inserted into the suction head (4), and a laterally distributed linkage portion (61) is provided on the piston rod (6); A middle sleeve (2) slidably inserted into the outer sleeve (1). At least one protrusion (21) for rotational positioning with the positioning groove (11) is formed protruding from the outer wall of the middle sleeve (2), and at least one hook (22) for rotational engagement with the linkage portion (61) is formed protruding from the lower end face of the middle sleeve (2); An inner sleeve (3) telescopically installed in the middle sleeve (2), and a button (7) is connected to the inner sleeve (3); A ring gear column (5) having a number of ring gears (51) equally spaced around its circumference. The lower surface of the ring gear (51) has an inclined surface and a gap (511) is formed between adjacent ring gears (51). The ring gear column (5) is inserted through the inner sleeve (3); One end of the ring gear column (5) is fixedly inserted into the button (7), and the other end of the ring gear column (5) is fixedly connected to the piston rod (6). When the button (7) is pressed, the ring gear column (5) pushes the piston rod (6) to equally discharge the liquid in the suction head (4) outward. A return spring (8) for jacking up the inner sleeve (3) to achieve repeated sample addition is provided in the middle sleeve (2).

2. The liquid separation device capable of continuous sample addition according to claim 1, wherein: A limiting through hole (23) for the ring gear column (5) to pass through is formed in the middle sleeve (2), and a convex ring (24) protrudes upward from the limiting through hole (23). One end of the return spring (8) is fixedly sleeved on the convex ring (24).

3. The liquid separation device capable of continuous sample addition according to claim 2, wherein: An elastic tooth (241) with elasticity is also formed on the convex ring (24). The elastic tooth (241) includes: an elastic section (2410) and a hook tooth (2411) integrally formed with the elastic section (2410) and capable of meshing with the ring gear (51) of the ring gear column (5).

4. A liquid separation device capable of continuous sample addition according to claim 1, characterized in that: The positioning groove (11) includes a chute (110) radially distributed along the inner wall of the outer sleeve (1) and a positioning sub-groove (120) vertically opened with the chute (110) and used for rotational engagement of the protrusion (21). An observation hole (130) is formed in the outer sleeve (1) at the positioning sub-groove (120). The observation hole (130) penetrates the positioning sub-groove (120) and is used to observe the positioning sub-groove (120). A first fastening hole (25) is also formed in the upper end of the middle sleeve (2).

5. The liquid separation device capable of continuous sample addition according to claim 4, wherein: A first buckle (31) for connecting and fixing with the first fastening hole (25) is formed at the upper end of the inner sleeve (3). A second fastening hole (32) is also formed in the inner sleeve (3) above the first buckle (31).

6. The liquid separation device capable of continuous sample addition according to claim 1, wherein: A plurality of elastic flap-like bodies (33) capable of elastic deformation are formed on the lower end surface of the inner sleeve (3). The elastic flap-like bodies (33) are clamped in the gap (511) to axially limit the ring gear column (5). The inner wall of the elastic flap-like body (33) has an inclined surface, and the lower surface of the ring gear (51) abuts against the inner wall of the elastic flap-like body (33). When the ring gear column (5) moves downward, the elastic flap-like body (33) is driven by the ring gear (51) to open from the inside to the outside.

7. A liquid separation device capable of continuous sample addition according to claim 5, characterized in that: The button (7) is formed with a second buckle (72) for connecting and fixing with the second buckling hole (32). The button (7) is also formed with a lifting portion (73) having a size larger than the outer sleeve (1) and for lifting by a human hand.

8. A liquid separation device capable of continuous sample addition according to claim 4, characterized in that: The linkage portion (61) of the piston column (6) includes a first extension portion (611) extending horizontally, a second extension portion (612) extending horizontally and located on the same horizontal line as the first extension portion (611), and a third buckling groove (613) located between the first extension portion (611) and the second extension portion (612). A first slider (614) for slidingly connecting with the chute (110) is formed at the tail end of the first extension portion (611), and a second slider (615) for slidingly connecting with the chute (110) is formed at the tail end of the second extension portion (612). A sealing flange (62) for forming a pumping piston is formed at the lower end of the piston column (6).

9. The liquid separation device capable of continuous sample addition according to claim 8, characterized in that: A buckling portion (53) for fixedly buckling with the third buckling groove (613) is formed at the lower end of the ring gear column (5).

10. A liquid separation device capable of continuous sample addition according to any one of claims 1-9, characterized in that: A first clamping portion (101) for fixedly connecting with the suction head (4) is formed at the lower end of the outer sleeve (1). Correspondingly, a second clamping portion (42) for connecting with the first clamping portion (101) is formed on the suction head (4).

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