Pipette tip assembly

Abstract

The utility model discloses a pipettor suction head assembly which comprises a body, the body comprises a cylindrical connecting area used for being connected with a pipettor, a cylindrical control area used for channel control and a conical storage area used for storing liquid, and the cylindrical connecting area, the cylindrical control area and the conical storage area are sequentially and integrally formed from top to bottom. The inner wall of the cylindrical control area is in sliding fit with an outer buoyancy sliding plug, the outer buoyancy sliding plug is in sliding fit with an inner sliding plug through a sliding cavity formed in the inner wall of the outer buoyancy sliding plug, the side wall of the outer buoyancy sliding plug is provided with a first communication channel, and the side wall of the cylindrical control area is provided with a communication hole. According to the liquid transfer device, the liquid transfer device is communicated with the atmosphere to perform'pressure relief 'when the liquid transfer device continuously provides negative pressure suction acting force through multiple channels, so that liquid can be prevented from entering the liquid transfer device due to further increase of the negative pressure while the negative pressure is ensured to exist, and the liquid transfer device is prevented from being polluted or damaged.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipettor technical field, especially pipettor suction head subassembly. BACKGROUND

[0002] Pipettor is also called pipette, which is a kind of measuring tool for moving liquid from the original container to another container within a certain range. It is widely used in biology, chemistry and other fields. The suction head of pipettor is detachably matched with pipettor. The suction head realizes liquid suction and discharge and temporary storage through positive and negative pressure control of pipettor.

[0003] Through retrieval, the patent with Chinese patent publication No. CN210058297U discloses a pipettor suction head assembly, which comprises a pipettor suction head, a connecting end for cooperation with a pipettor, and a suction head end for suction or discharge of liquid; a positioning device is arranged between the pipettor suction head and the upper surface of the conductive cover in the digital microfluidic system, and is used for blocking the pipettor suction head, so that the distance between the end of the pipettor suction head deep into the conductive cover and the electrode array in the digital microfluidic system is greater than zero.

[0004] The above-mentioned patent has the following disadvantages: it does not have an over-suction protection assembly. If the suction amount of pipettor is large and exceeds the storage amount of the suction head assembly, liquid will enter the interior of pipettor, causing pollution or damage to pipettor.

[0005] Therefore, a pipettor suction head assembly is proposed. CONTENT OF THE UTILITY MODEL

[0006] The technical scheme of the utility model embodiment is implemented as follows: a body is composed of a cylindrical connecting area for connecting with a pipettor, a cylindrical control area for passage control and a conical storage area for storing liquid, which are integrally formed from top to bottom, an outer buoyancy sliding plug is slidingly matched with the inner wall of the cylindrical control area, an inner sliding plug is slidingly matched with the sliding cavity formed in the inner wall of the outer buoyancy sliding plug, a communication passage one is formed in the side wall of the outer buoyancy sliding plug, a communication hole is formed in the side wall of the cylindrical control area, a broken line passage is formed in the bottom of the outer buoyancy sliding plug, and a "T"-shaped passage two is formed in the top of the inner sliding plug.

[0007] In some embodiments, the "T"-shaped passage two is in communication with the sliding cavity and the broken line passage.

[0008] In some embodiments, a spring is buckled to the top outer wall of the inner sliding plug, and the other end of the spring is buckled to the top inner wall of the outer buoyancy sliding plug.

[0009] In some embodiments, the inner side wall of the outer buoyancy plug is fixed with elastic arc head clamps, and the side wall of the inner plug is provided with two groups of clamping grooves matched with the elastic arc head clamps.

[0010] In some embodiments, the positions of the two groups of clamping grooves are respectively the same as the heights of the transverse passages of the "T"-shaped cavity one and the "T"-shaped cavity two.

[0011] In some embodiments, the inner wall of the cylindrical connecting area is fixed with convex threads.

[0012] In some embodiments, the outer wall of the cylindrical control area is fixed with uniform anti-skid edges.

[0013] The embodiments of the utility model have the following advantages due to the adoption of the above technical solutions.

[0014] The pipette tip assembly is provided with the outer buoyancy plug, and is controlled through the multiple channels. On one hand, when the pipette continuously provides the negative pressure suction force, the pipette can be communicated with the atmosphere to release the pressure, so that the negative pressure is ensured, and the liquid is prevented from entering the interior of the pipette due to the further increase of the negative pressure, and the pipette is prevented from being contaminated or damaged. The pipette tip assembly is provided with the inner plug, and the principle of air path switching is utilized, so that when the pipette is used for single pipetting, the volume pressure change of the pipette during the suction is less than the volume pressure change during the discharge, so that the discharge of the liquid is more thorough, and the residual liquid is prevented. The pipette tip assembly is provided with the elastic arc head clamps and the clamping grooves, so that the inner plug has and only has two fixed positions corresponding to the two different working states of the tip assembly through the clamping force of the elastic arc head clamps and the clamping grooves, so that the reliability of use is ensured. ACCURATE DESCRIPTION

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0016] Figure 1 It is a whole structure diagram of the utility model;

[0017] Figure 2 It is a sectional structure diagram of the outer buoyancy plug of the utility model;

[0018] Figure 3 It is a sectional structure diagram of the inner plug of the utility model;

[0019] Figure 4 It is a structure diagram of the elastic arc clamp and the clamping groove of the utility model;

[0020] Figure 5 This is a diagram of the raised texture structure of this utility model.

[0021] Figure label:

[0022] 1- Conical storage area, 2- Columnar control area, 3- Anti-slip ridge, 4- Columnar connection area, 5- Connecting channel one, 6- Connecting hole, 7- "T" shaped cavity one, 8- Inner sliding plug, 9- Folded channel, 10- Outer buoyancy sliding plug, 11- Sliding cavity, 12- "T" shaped cavity two, 13- Spring, 14- Elastic arc-shaped locking head, 15- Locking groove, 16- Raised texture. Detailed Implementation

[0023] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0024] Example 1:

[0025] like Figures 1-5 As shown, the pipette tip assembly includes a body, which comprises, from top to bottom, an integrally formed cylindrical connection area 4 for connecting to the pipette, a cylindrical control area 2 for channel control, and a conical storage area 1 for storing liquid. An outer buoyancy plug 10 is slidably fitted on the inner wall of the cylindrical control area 2. An inner plug 8 is slidably fitted on the outer buoyancy plug 10 through a sliding cavity 11 opened in its inner wall. A connecting channel 5 is opened on the side wall of the outer buoyancy plug 10, a connecting hole 6 is opened on the side wall of the cylindrical control area 2, a zigzag channel 9 is opened at the bottom of the outer buoyancy plug 10, and a T-shaped cavity 7 is opened at the top of the inner plug 8.

[0026] In use, the pipette tip assembly is connected to the pipette via the cylindrical connection area 4. The pipette generates negative pressure, which is then transmitted to the cylindrical control area 2. Since the connecting channel 5 and the connecting hole 6 are not connected at this time, and the bottom of the zigzag channel 9 is blocked by the inner wall of the conical storage area 1, the entire external buoyancy plug 10 can be regarded as a whole. It moves up a certain distance under negative pressure, thereby creating negative pressure in the conical storage area 1 to draw liquid. This continues until the connecting channel 5 and the connecting hole 6 coincide. The pipette then connects to the atmosphere through the connecting channel 5, the connecting hole 6, and the "T"-shaped passage 7. At this point, the pipette's aspiration speed determines the negative pressure, allowing for pipetting.

[0027] This device, by setting an external buoyancy slide plug 10 and controlling it through multiple channels, allows for "pressure relief" when the pipette continuously provides negative pressure suction force, by communicating the pipette with the atmosphere. This ensures the existence of negative pressure while preventing liquid from entering the pipette's interior due to further increase in negative pressure, thus preventing pipette contamination or damage.

[0028] In the embodiment, the bottom of the inner sliding plug 8 is provided with a "T"-shaped through cavity 12, which is in communication with the sliding cavity 11 and the fold line channel 9.

[0029] When the negative pressure provided by the pipette is further increased, the inner sliding plug 8 is also moved upward by the negative pressure, so that the "T"-shaped through cavity 12 is in communication with the communication channel 5 and the communication hole 6, the fold line channel 9 is in communication with the atmosphere, and the liquid stored in the conical storage area 1 is flowed out by gravity. After the pipette is closed, the inner sliding plug 8 and the outer buoyancy sliding plug 10 are reset, and the outer buoyancy sliding plug 10 is reset downward to generate a positive pressure in the conical storage area 1, so as to squeeze out the liquid possibly remaining in the conical storage area 1.

[0030] The device can make the volume pressure change of the pipette when sucking smaller than the volume pressure change when discharging by setting the inner sliding plug 8 and using the principle of air path switching, so as to make the liquid discharge more completely and prevent residual.

[0031] In the embodiment, the top outer wall of the inner sliding plug 8 is buckled with a spring 13, and the other end of the spring 13 is buckled to the top inner wall of the outer buoyancy sliding plug 10. The spring 13 can provide a reset force for the inner sliding plug 8.

[0032] In the embodiment, the inner side wall of the outer buoyancy sliding plug 10 is fixed with an elastic arc head clamp 14, and the side wall of the inner sliding plug 8 is provided with two groups of clamping grooves 15 matched with the elastic arc head clamp 14.

[0033] The positions of the two clamping grooves 15 are respectively the same as the heights of the transverse passages of the "T"-shaped through cavity 7 and the "T"-shaped through cavity 12.

[0034] When the "T"-shaped through cavity 7 is in communication with the communication channel 5, the top clamping groove 15 is clamped with the elastic arc head clamp 14, and when the "T"-shaped through cavity 12 is in communication with the communication channel 5, the bottom clamping groove 15 is clamped with the elastic arc head clamp 14.

[0035] By setting the elastic arc head clamp 14 and the clamping groove 15, the inner sliding plug 8 has and only has two fixed stations corresponding to two different working states of the suction head assembly through the clamping force of the elastic arc head clamp 14 and the clamping groove 15, so as to ensure the reliability of use.

[0036] In this embodiment: through the cylindrical connecting area 4, the pipette head assembly is connected with the pipette, the pipette generates negative pressure, so as to transmit the negative pressure to the cylindrical control area 2, since the communication channel one 5 and the communication hole 6 are not communicated at this time, and the bottom of the fold line channel 9 is blocked by the inner wall of the tapered storage area 1, no passage is formed, so the whole outer buoyancy sliding plug 10 can be regarded as a whole, which is moved upward by a distance under the negative pressure, so that the negative pressure appears in the tapered storage area 1 to suck the liquid, until the communication channel one 5 and the communication hole 6 coincide, the pipette is communicated with the atmosphere through the communication channel one 5, the communication hole 6 and the "T" type cavity one 7, at this time the suction speed of the pipette determines the negative pressure, the pipette can be used for pipetting, after reaching the liquid discharge position, when the negative pressure provided by the pipette is further increased, the inner sliding plug 8 will also be moved upward under the negative pressure, so that the "T" type cavity two 12 is communicated with the communication channel one 5, the communication hole 6, so that the fold line channel 9 is communicated with the atmosphere, the liquid stored in the tapered storage area 1 is flowed out under the gravity, at the same time after the pipette is closed, the inner sliding plug 8 and the outer buoyancy sliding plug 10 are reset, the outer buoyancy sliding plug 10 is reset downward, which generates positive pressure in the tapered storage area 1, and the liquid remaining in the tapered storage area 1 is squeezed out again.

[0037] Embodiment 2:

[0038] Pipette head assembly, the embodiment is improved on the basis of embodiment 1, as shown in the figure, the inner wall of the cylindrical connecting area 4 is fixed with the convex 16. Figures 1-5

[0039] The outer wall of the cylindrical control area 2 is fixed with uniform anti-skid rib 3.

[0040] In this embodiment: the pipette head assembly can be fixed with the pipette through the cylindrical connecting area 4, and the convex 16 can increase the friction force, so that the fixation is more stable, and the anti-skid rib 3 is arranged, which can increase the friction force between the hand and the cylindrical control area 2, so as to conveniently combine and separate the body and the pipette.​

Claims

1. A pipette tip assembly, characterized by, The utility model relates to a liquid storage device, including the body, the body includes the cylindrical connection area (4) for connecting with pipettor from top to bottom integrally formed in proper order, the cylindrical control area (2) for passage control and the conical storage area (1) for storing liquid are formed, the inner wall of cylindrical control area (2) is slidably fitted with outer buoyancy sliding plug (10), and the outer buoyancy sliding plug (10) is slidably fitted with inner sliding plug (8) through the sliding cavity (11) of its inner wall opening, the lateral wall of outer buoyancy sliding plug (10) is equipped with intercommunication channel one (5), the lateral wall of cylindrical control area (2) is equipped with intercommunication hole (6), the bottom of outer buoyancy sliding plug (10) is equipped with fold line channel (9), and the top of inner sliding plug (8) is equipped with " T " type through cavity one (7).

2. The pipette tip assembly of claim 1, wherein, The bottom of inner sliding plug (8) is equipped with " T " type through cavity two (12), and " T " type through cavity two (12) is interconnected with sliding cavity (11) and fold line channel (9).

3. The pipette tip assembly of claim 1, wherein, The top outer wall of inner sliding plug (8) is buckled with spring (13), and the other end of spring (13) is buckled in the top inner wall of outer buoyancy sliding plug (10).

4. The pipette tip assembly of claim 1, wherein, The inner lateral wall of outer buoyancy sliding plug (10) is fixed with elastic arc head chuck (14), and the lateral wall of inner sliding plug (8) is equipped with two groups of clamping slot (15) matched with elastic arc head chuck (14).

5. The pipette tip assembly of claim 4, wherein, The position of two clamping slot (15) is respectively same with the height of the transverse passage of " T " type through cavity one (7) and " T " type through cavity two (12).

6. The pipette tip assembly of claim 1, wherein, The inner wall of cylindrical connection area (4) is fixed with convex grain (16).

7. The pipette tip assembly of claim 1, wherein, The outer wall of cylindrical control area (2) is fixed with uniform antiskid rib (3).

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