Pipette

Abstract

The pipette comprises a pipette body, a pipette head, a button, a counting assembly, a supporting piece, a roller, a ratchet wheel and pawl mechanism and the like, when a plurality of sample adding hole grooves in a sample adding box are subjected to blowing, beating and liquid adding, after liquid is added into one sample adding hole groove, the liquid adding button is pressed for multiple times to complete blowing and beating, then the button is pressed down to replace the pipette head, and the pipette head is replaced. The pawl and the button synchronously do linear motion towards the gun head, when the button is pressed down, the pawl is driven downwards, the lower end of the pawl presses ratchets on the ratchet wheel downwards, so that the ratchet wheel is driven to rotate anticlockwise, the roller also rotates by a first circumferential angle, and the division mark rotates; then, the other sample adding hole grooves are subjected to blowing and beating liquid adding one by one, and the operation is repeated, so that an operator can be helped to clearly know how many sample adding hole grooves are subjected to blowing and beating operation according to the rotation of the division marks, and the technical problem that the counting pipette in the prior art is difficult to effectively count the blowing and beating operation is solved; therefore, the beneficial effects are achieved.

Description

Technical Field

[0001] The invention relates to the field of biochemistry and medical laboratory equipment, and in particular to a liquid transfer gun. Background Art

[0002] In biochemical and medical laboratories, a pipette is a basic and common pipetting device, including a gun body, a gun tip, a liquid adding button and a gun tip removal button, wherein the gun tip is usually detachably connected to one end of the gun body by a snap-on structure, and the gun tip removal button is connected to a push rod and other pressing structures. When the gun tip removal button is pressed, the pressing structure is driven to move toward the snap-on connection between the gun body and the gun tip, and acts on the snap-on connection between the gun body and the gun tip by pressing, pushing, etc., so that the snap is separated, and the gun tip can be removed from the gun body.

[0003] During use, it is often used in combination with a sample loading box. In the prior art, the sample loading box is provided with sample loading wells arranged in multiple rows and columns. A pipette is used to draw the sample liquid and a liquid adding button is pressed to add the sample liquid into the sample loading wells one by one / row by row.

[0004] In the above technical process, due to the dense array of sample wells and the small amount of liquid transferred by the pipette, it is difficult to distinguish with the naked eye whether there is liquid in the sample well slot, and in repeated operations, personnel need to shift their sight and hand pipetting movements back and forth between the sample box and the solution container. Limited by the fluctuation of personnel's attention and resolution ability, it is easy to cause cognitive confusion and operational errors in the highly repetitive liquid addition work, which leads to missed rows or repeated addition of liquid in the liquid addition slot that has been added, so as to affect the experimental results. Based on the above problems, some existing technologies have added a counting device to the pipette, and the counting device is connected to the liquid addition button. Since the liquid addition button is only pressed once when adding a sample well slot, the number of times the liquid addition button is pressed can be counted to help the user clearly understand how many sample well slots have been added, so as to overcome the problems in the liquid addition process.

[0005] However, in some scenarios, the pipette also has a technical means of repeatedly aspirating multiple liquids in a sample addition slot for blowing and mixing, so as to achieve a liquid mixing effect in the sample addition slot. In this scenario, the sample addition slots still need to be operated one by one / row by row, so it is still necessary to overcome the problems of cognitive confusion and errors in the operation. However, in this operation, it is necessary to press the liquid addition button multiple times when blowing and beating the liquid in a sample addition slot. In actual use, it is difficult for personnel to ensure that the liquid addition button is pressed a fixed number of times to complete the mixing during each blowing and beating operation, so that the counting device connected to the liquid addition button is difficult to help the user clearly recognize how many sample addition slots have been blown and beated. Therefore, a new technology is needed to overcome the above technical problems. Summary of the invention

[0006] The purpose of the present invention is to overcome the problems in the prior art and provide a liquid transfer gun.

[0007] The present invention provides a liquid transfer gun, comprising:

[0008] A gun body, a gun head and a button, wherein the gun head is detachably connected to the gun body, the button is arranged on the gun body, and the button is connected to the gun head through a pressing structure so that the gun head can be detached from the gun body;

[0009] Counting component, the counting component includes:

[0010] The roller is rotatably connected to the gun body, and a plurality of scale marks are marked at equal angle intervals on the circumference of the roller, one scale mark corresponds to one number, and the interval angle between each adjacent scale mark is a first circumferential angle;

[0011] The ratchet and pawl mechanism comprises a pawl and a ratchet wheel. The pawl is connected to a button so that the pawl and the button can move linearly synchronously. The ratchet wheel is coaxially fixedly connected to a roller. The pawl and the ratchet wheel are meshed and connected. Whenever the button is pressed, the ratchet wheel drives the roller to rotate once at a first circular angle.

[0012] Furthermore, the ratchet pawl mechanism also includes a connecting part, a pin shaft and a coil spring, the connecting part is connected to the button, the pin shaft is connected to the connecting part, the pin shaft is parallel to the rotation axis of the roller, the pawl is rotatably connected to the pin shaft, and the coil spring is connected between the pawl and the pin shaft.

[0013] Furthermore, the counting assembly also includes: a support member, the support member is detachably connected to the gun body, the roller is rotatably connected to the support member, and the connecting part is detachably connected to the button.

[0014] Furthermore, the counting assembly also includes a shell, which is detachably connected to the gun body, and has an opening at one end of the shell facing the button. The support is connected to the inside of the shell, the ratchet and the pawl are both arranged inside the shell, and the connecting part passes through the opening of the shell at one end facing the button.

[0015] Furthermore, the roller is located in the housing, and an observation window is provided on the side wall of the housing, and the observation window is configured so that the scale marks on the roller can be observed through the observation window.

[0016] Furthermore, the counting assembly also includes: a first fixing belt, the first fixing belt is elastic, both ends of the first fixing member are connected to the shell, and the first fixing belt is configured to be able to be sleeved on the outer side of the gun body to achieve a detachable connection between the shell and the gun body.

[0017] Furthermore, the gun body has a top surface at one end facing the button in the length direction, the first fixing belt is perpendicular to the length direction of the gun body, and the counting component also includes: a second fixing belt, both ends of the second fixing belt are connected to the first fixing belt, and the middle part of the second fixing belt is against the top surface.

[0018] Furthermore, twelve division marks are marked at equal angles on the circumference of the roller.

[0019] Furthermore, there are identification color blocks on the roller surface between adjacent division marks, and the color saturation of the identification color blocks between each division mark gradually changes along the circumference of the roller.

[0020] Compared with the prior art, the beneficial effect of the present invention is: when using the present invention to perform blowing and adding liquid to several sample loading wells in the loading box, after adding liquid to one sample loading well, press the liquid adding button several times to complete the blowing, and then press the button to replace the gun head. When the button 13 is pressed, the pawl 51 is driven downward, and the lower end of the pawl 51 presses down the ratchet teeth on the ratchet 61, thereby driving the ratchet 61 to rotate counterclockwise, and the rotation angle is the first circumferential angle, so the roller also rotates the first circumferential angle, so that the dividing mark rotates, so that the operator recognizes that a gun head replacement has been performed, that is, a blowing and adding liquid operation has been completed, and then the blowing and adding liquid are performed on other sample loading wells one by one and the above-mentioned operation is repeated, so that the operator can clearly recognize how many sample loading wells have been blown according to the rotation of the dividing mark, thereby solving the technical problem that the counting pipette in the prior art is difficult to effectively count the blowing and adding operations, thereby achieving beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic front view of the overall structure of one embodiment;

[0022] Figure 2 This is a front cross-sectional view of the main structure when one of the embodiments is used.

[0023] Description of reference numerals:

[0024] 11. gun body; 12. gun head; 13. button; 2. support member; 3. roller; 41. connecting part; 42. pin shaft; 51. pawl; 52. coil spring; 61. ratchet; 7. housing; 81. first fixing belt; 82. second fixing belt. DETAILED DESCRIPTION

[0025] The specific implementation of the present invention is described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific implementation. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The present invention provides a liquid transfer gun, comprising: a gun body 11, a gun head 12, a button 13, a counting assembly, etc., wherein the gun body 11 has a length direction, the gun head 12 is detachably connected to the gun body 11, the button 13 is arranged on the gun body, the button 13 is connected to the gun head 12 through a pressing structure, so that the gun head 12 can be removed from the gun body 11, and the key travel length of the button 13 is a first length; the counting assembly comprises: a roller 3 rotatably connected to the gun body 11, and the roller 3 is marked with equal angles at intervals on the circumference thereof There are multiple scale marks, one scale mark corresponds to one number, and the interval angle between adjacent scale marks is a first circular angle; the ratchet pawl mechanism includes a pawl 51 and a ratchet 61, the pawl 51 is connected to the button 13 so that the pawl 51 and the button 13 can move linearly synchronously, the ratchet 61 is coaxially fixedly connected to the roller 3, the pawl 51 is meshedly connected to the ratchet 61, and the ratchet pawl mechanism is configured so that whenever the button 13 is pressed once, the ratchet 61 drives the roller 3 to rotate once at the first circular angle.

[0027] Specifically, please refer to Figure 1 and Figure 2 When the present invention is used to perform blowing and adding liquid to several sample wells in the sample loading box, after adding liquid to one sample well, press the liquid adding button several times to complete the blowing, and then press the button 13 to replace the gun head 12. The pawl 51 and the button 13 synchronously make a linear motion toward the gun head, and the movement distance is the first length. When the button 13 is pressed, the pawl 51 is driven downward, and the lower end of the pawl 51 presses down the ratchet teeth on the ratchet 61, thereby driving the ratchet 61 to rotate counterclockwise. The key stroke of the button 13 is set to the first length. Through the setting of the ratchet and pawl mechanism in conventional technical means, the pawl 51 can drive the ratchet 61 to rotate by the first circumferential angle each time it moves downward by the first length. As the button 13 is pressed, the gun head 12 is separated, and the button 13 is lifted to reset the pawl 51 upward. During the resetting process, the pawl 51 cannot engage with the ratchet 61, so the rotation of the ratchet 61 will not be triggered. When the roller 3 rotates the first circular angle, the dividing mark rotates, so that the operator can realize that a gun tip replacement has been performed, that is, a blowing and liquid adding operation has been completed, and then the blowing and liquid adding operations are performed on other sample addition wells one by one and the above operations are repeated. The rotation of the dividing mark can help the operator to clearly recognize how many sample addition wells have been blown and liquid-added, thereby solving the technical problem that the counting pipette in the prior art is difficult to effectively count the blowing and liquid-adding operations, thereby achieving beneficial effects.

[0028] In this embodiment, the division marks on the roller 3 are set as digital marks, and the specific numbers displayed are the numbers corresponding to the division marks, which can record the number of times the gun tip 12 is replaced. In other embodiments, different division marks can also be set with different colors, one number corresponds to one color, and the depth of the color can increase / decrease as the corresponding number increases. For example, the division mark corresponding to the number 1 is a light green color block, and the division mark corresponding to the number 12 is a dark green color block, so that the worker can intuitively judge how many lines of liquid addition he has completed. And this design can also remind the worker to replace the gun tip box in time when seeing a large number.

[0029] In some other embodiments, even if the blowing operation is not performed, the present invention can also achieve certain technical effects, especially in some experiments, each time the liquid is added twice in the sample well slot, the liquid in the first liquid addition will be contaminated, and cross contamination of the liquid between the sample well slots is avoided. It is necessary to consider replacing the gun tip 12 after each sample addition. For example, in the agarose gel electrophoresis experiment, the most commonly used 12×8 agarose gel electrophoresis plate has 96 sample well slots that need to be added, and during the experiment, loading buffer reagents need to be added to each sample well slot first. This reagent is bluish purple. The DNA samples added later are colorless and transparent, and it is often impossible to determine whether this liquid addition step has been completed in the sample well slot. When using the present invention, each time a liquid addition is completed and a gun tip is replaced, it will be counted once on the counting component.

[0030] Furthermore, the ratchet pawl mechanism further includes a connecting portion 41, a pin 42 and a coil spring 52, wherein the connecting portion 41 is connected to the button 13, the pin 42 is connected to the connecting portion 41, the pin 42 is parallel to the rotation axis of the roller 3, the pawl 51 is rotationally connected to the pin 42, and the coil spring 52 is connected between the pawl 51 and the pin 42. The coil spring provides an angle reset for the pawl 51 so that it can engage with the root of the ratchet teeth of the ratchet wheel 61 when it is pressed next time, and the connecting portion 41 provides a suitable installation position for the pawl.

[0031] Furthermore, considering that the counting component identifies the number of times the gun tip 12 is replaced by the graduated marks on the roller 3, in order to further facilitate the user's counting and recognition, the number of graduated marks on the roller 3 is set according to the array of sample well slots on the sample loading box. For example, when using the most common sample loading box with sample well slots arranged in a 12×8 array, the number of graduated marks on the roller 3 is set to 12. The user knows through the graduated marks that the roller 3 has rotated one circle, and can recognize that the operation of a column of sample well slots has been completed.

[0032] Furthermore, since the button 13 of the pipette is frequently used, the wear, failure and service life of the ratchet pawl mechanism need to be considered. In order to increase the adaptability of the counting component and reduce the difficulty of replacement and maintenance, the counting component also includes: a support member 2, the support member 2 is detachably connected to the gun body 11, the roller 3 is rotatably connected to the support member 2, and the connecting part 41 is detachably connected to the button 13.

[0033] In this embodiment, the connecting portion 41 is a rod structure, and one end of the rod structure facing the button 13 is detachably connected to the button 13. In this embodiment, a detachable connection is achieved by using an adhesive layer / Velcro provided on the end of the first-level connecting portion 41 on the outer side of the button. In other embodiments, methods such as a snap connection, a magnetic detachable connection, etc. may also be used.

[0034] Furthermore, in order to protect the ratchet and pawl mechanism and the connection between each moving structure, the counting assembly also includes a shell 7, which is detachably connected to the gun body 11, and has an opening at one end of the shell 7 facing the button 13. The support member 2 is connected to the inside of the shell 7, and the ratchet 61 and the pawl 51 are both located inside the shell 7. The connecting portion 41 passes through the opening of the shell 7 at one end facing the button 13.

[0035] Furthermore, in consideration of both the protection of the roller 3 and the ability of personnel to observe the roller 3, the roller 3 is located in the housing 7, and an observation window is provided on the side wall of the housing 7. The observation window is configured so that the graduation mark on the roller can be observed through the observation window. Figure 2 As shown, the observation window is an open opening on the shell 7, and part of the roller 3 is located in the observation window. In some other embodiments, the observation window is a transparent plate embedded in the shell 7, which can also achieve corresponding technical effects.

[0036] Furthermore, the counting assembly also includes: a first fixing belt 81, which is elastic, and both ends of the first fixing member are connected to the shell 7. The first fixing belt 81 is configured to be able to be sleeved on the outer side of the gun body 11 to achieve a detachable connection between the shell 7 and the gun body 11.

[0037] Furthermore, the gun body 11 has a top surface at one end facing the button 13 in the length direction, the first fixing belt 81 is perpendicular to the length direction of the gun body 11, and the counting component also includes: a second fixing belt 82, both ends of the second fixing belt 82 are connected to the first fixing belt 81, and the middle part of the second fixing belt 82 is against the top surface.

[0038] Furthermore, twelve division marks are marked at equal angular intervals on the circumference of the roller 3 .

[0039] Furthermore, there are identification color blocks on the surface of the roller 3 between adjacent dividing marks, and the color saturation of the identification color blocks between the respective dividing marks changes gradually along the circumference of the roller 3 .

[0040] 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 can be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pipette gun, comprising a gun body (11), a gun head (12) and a button (13), wherein the gun head (12) is detachably connected to the gun body (11), the button (13) is arranged on the gun body, and the button (13) is connected to the gun head (12) through a pressing structure so that the gun head (12) can be removed from the gun body (11), characterized in that: The pipette also includes: A counting component, the counting component comprising: The roller (3) is rotatably connected to the gun body (11), and a plurality of scale marks are marked at equal angle intervals on the circumference of the roller (3), one scale mark corresponds to one number, and the interval angle between adjacent scale marks is a first circumferential angle; The ratchet pawl mechanism comprises a pawl (51) and a ratchet wheel (61), wherein the pawl (51) is connected to the button (13) so that the pawl (51) and the button (13) move linearly synchronously, the ratchet wheel (61) is coaxially fixedly connected to the roller (3), the pawl (51) and the ratchet wheel (61) are meshedly connected, and each time the button (13) is pressed once, the ratchet wheel (61) drives the roller (3) to rotate once at a first circular angle.

2. A pipette as claimed in claim 1, characterized in that: The ratchet pawl mechanism further comprises a connecting portion (41), a pin shaft (42) and a coil spring (52); the connecting portion (41) is connected to the button (13); the pin shaft (42) is connected to the connecting portion (41); the pin shaft (42) is parallel to the rotation axis of the roller (3); the pawl (51) is rotationally connected to the pin shaft (42); and the coil spring (52) is connected between the pawl (51) and the pin shaft (42).

3. A liquid transfer gun as claimed in claim 2, characterized in that: The counting assembly further comprises: a support member (2), the support member (2) being detachably connected to the gun body (11), the roller (3) being rotatably connected to the support member (2), and the connecting portion (41) being detachably connected to the button (13).

4. A pipette as claimed in claim 3, characterized in that: The counting assembly further comprises a shell (7), the shell (7) being detachably connected to the gun body (11), the shell (7) having an opening at one end facing the button (13), the support member (2) being connected to the inside of the shell (7), the ratchet (61) and the ratchet pawl (51) being both arranged inside the shell (7), and the end of the connecting portion (41) facing the button (13) passing through the opening of the shell (7).

5. A liquid transfer gun as claimed in claim 4, characterized in that: The roller is located in the housing (7), and an observation window is provided on the side wall of the housing (7), wherein the observation window is configured so that the scale marks on the roller can be observed through the observation window.

6. A liquid transfer gun as claimed in claim 5, characterized in that: The counting assembly further comprises: a first fixing belt (81), the first fixing belt (81) being elastic, the two ends of the first fixing member being connected to the shell (7), the first fixing belt (81) being configured to be sleeved on the outer side surface of the gun body (11) to achieve a detachable connection between the shell (7) and the gun body (11).

7. A liquid transfer gun as claimed in claim 6, characterized in that: The gun body (11) has a top surface at one end facing the button (13) in the length direction, and the first fixing belt (81) is perpendicular to the length direction of the gun body (11). The counting component also includes: a second fixing belt (82), both ends of the second fixing belt (82) are connected to the first fixing belt (81), and the middle part of the second fixing belt (82) is against the top surface.

8. A liquid transfer gun as claimed in claim 5, characterized in that: The roller (3) is marked with twelve division marks at equal angle intervals on its circumference.

9. A liquid transfer gun as claimed in claim 8, characterized in that: There are marking color blocks on the surface of the roller (3) between adjacent dividing marks, and the color saturation of the marking color blocks between the dividing marks changes gradually along the circumference of the roller (3).

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