CN219072983U - Pipetting suction head and pipetting device - Google Patents

Abstract

The utility model belongs to the technical field of medical equipment, and particularly relates to a pipette tip and a pipette. In the pipetting head, one end of the shell, which is far away from the movable driving piece, is provided with a first opening communicated with the inner space, one end of the pusher is arranged in the inner space, and the other end of the pusher passes through the first opening; the pushing and unloading device is provided with an abutting part, the elastic piece is sleeved on the pushing and unloading device, and the opposite ends of the elastic piece are respectively abutted with the abutting part and the inner wall of the first opening; the ejector is provided with a first through hole, one end of the ejector extends into the inner space of the shell, and the other end of the ejector penetrates through the first opening and is connected with the suction head assembly; the push rod is arranged in the inner space and is positioned at one end of the movable driving piece, which is far away from the suction head assembly, and the ejector is abutted against the end of the movable driving piece; the movable driving piece is used for driving the unloader to move through the push rod so as to take down the suction head assembly. In the utility model, the ejector compresses the elastic piece in the downward moving process of the ejector, thereby ensuring the downward moving stability of the ejector.

Description

Pipetting suction head and pipetting device

Technical Field

The utility model belongs to the technical field of medical equipment, and particularly relates to a pipette tip and a pipette.

Background

Pipettes are small-volume devices commonly used in laboratories to remove liquids and are widely used in clinical diagnostic laboratories, biotechnology laboratories, medical and chemical laboratories, environmental laboratories, food laboratories, and the like. With the continuous improvement of the automation degree of laboratory instruments, an automation assembly line workstation gradually becomes a main angle in a laboratory, and a liquid transfer device is usually required to be configured at each liquid suction station of the automation assembly line to transfer liquid, and a liquid transfer suction head is used as an important component part of the liquid transfer device, so that the precision requirement is also higher and higher.

The end part of the pipetting suction head is provided with an inserting port, and the suction head is inserted into the inserting port; in the process that the pipette tip drives the plug end to move to replace the pipette tip, the end of the pipette tip has a shaking phenomenon, so that the plug port is deformed, and an unstable accident exists when the pipette tip is plugged into the plug port.

Disclosure of Invention

The technical problems to be solved by the utility model are as follows: aiming at the problem that the movement of the plugging end of the existing pipetting tip is unstable, the pipetting tip and the pipetting device are provided.

In order to solve the technical problems, an embodiment of the present utility model provides a pipette tip, including a push rod, a pusher, a tip assembly, an elastic member, a housing having an inner space, and a moving driving member mounted on the housing; one end of the shell, which is far away from the movable driving piece, is provided with a first opening communicated with the inner space, one end of the pushing and unloading device is arranged in the inner space, and the other end of the pushing and unloading device penetrates through the first opening; the ejector is provided with an abutting part, the elastic piece is sleeved on the ejector, and the opposite ends of the elastic piece are respectively abutted with the abutting part and the inner wall of the first opening;

the ejector is provided with a first through hole, one end of the ejector extends into the inner space, and the other end of the ejector penetrates through the first opening and is connected with the suction head assembly;

the push rod is arranged in the inner space and is positioned at one end, far away from the suction head assembly, of the movable driving piece and the pusher to be abutted; the movable driving piece is used for driving the unloader to move through the push rod so as to take down the suction head assembly.

Optionally, the suction head assembly comprises a suction head and a connecting pipe, one end of the connecting pipe is connected with the suction head, and the other end of the connecting pipe is inserted into the first through hole; the ejector is used for pushing the suction head out of the connecting pipe.

Optionally, the suction head is provided with a plug hole, an abutting part is arranged on the outer wall of the plug hole, one end of the connecting pipe, which is far away from the pushing and unloading device, is plugged in the plug hole, and one end of the pushing and unloading device, which is far away from the push rod, is abutted with the abutting part.

Optionally, the pipette tip further comprises a plunger pump, the plunger pump comprises a plunger rod and a base provided with a cavity, the base is installed in the inner space, and a first air hole communicated with the cavity is further formed in the base; one end of the plunger rod is inserted into the cavity, and the other end of the plunger rod is connected with the moving driver;

one end of the connecting pipe, which is far away from the suction head, extends into the first through hole and is connected with the base, and the connecting pipe is provided with the first air hole and the second air hole of the suction head.

Optionally, the movable driving piece comprises a motor, a screw rod and a screw nut, the motor is installed at one end of the shell far away from the first opening, the output end of the motor is connected with the screw rod, and one end of the screw rod far away from the motor is connected with the screw nut; the push rod is installed between the screw nut and the ejector.

Optionally, a sliding groove is formed in the nut, and the pipetting tip further comprises a sliding rod mounted on the inner wall of the inner space, and the sliding rod is inserted into the sliding groove.

Optionally, the pipette tip further comprises a displacement sensor installed on the inner wall of the inner space, an induction groove is formed in the displacement sensor, and an induction block inserted into the induction groove is further arranged on the nut.

Optionally, the shell comprises a first mounting seat, a second mounting seat and a sleeve, the second mounting seat is mounted between the first mounting seat and the sleeve, the internal space comprises a first space arranged on the first mounting seat and a second space arranged on the sleeve, and one end of the sleeve, far away from the second mounting seat, is provided with the first opening; the second mounting seat is provided with a second through hole which is communicated with the first space and the second space;

the movable driving piece is arranged at one end, far away from the second mounting seat, of the first mounting seat, the pushing and unloading device is arranged in the second space, one end of the push rod is abutted to the movable driving piece, and the other end of the push rod passes through the second through hole and then is abutted to the pushing and unloading device.

Optionally, the second mount pad is kept away from the one end of first mount pad is equipped with the bulge, be equipped with the external screw thread on the bulge, be equipped with the internal screw thread on the inner wall in second space, the bulge inserts in the second space, the external screw thread with internal screw thread threaded connection.

The utility model also provides a pipette, which comprises the pipette tip.

In the utility model, the movable driving piece pushes the push rod downwards, the push rod drives the unloader to move downwards, the elastic piece is compressed by the unloader which moves downwards, and the sucker assembly is pushed downwards by the unloader which moves downwards, so that the sucker assembly is detached (namely, the detachment of the sucker assembly is completed); in the downward moving process of the ejector, the ejector compresses the elastic piece, so that the downward moving stability of the ejector is guaranteed, the accident that the suction head assembly is damaged due to the shaking of the ejector is avoided, and the assembling and disassembling stability of the suction head assembly is guaranteed.

Drawings

The utility model will be further described with reference to the drawings and examples.

FIG. 1 is a schematic diagram of a CPR machine according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of a pipette tip according to one embodiment of the present utility model;

FIG. 3 is a schematic view of a portion of a pipette tip according to an embodiment of the present utility model;

FIG. 4 is a schematic view of a pipette tip assembly according to one embodiment of the present utility model.

Reference numerals in the specification are as follows:

1. a push rod; 2. a pusher; 21. a first through hole; 3. a suction head assembly; 31. a suction head; 311. an abutting portion; 32. a connecting pipe; 321. a second air hole; 4. an elastic member; 5. a housing; 51. an inner space; 511. a first space; 512. a second space; 52. a first mount; 53. a second mounting base; 54. a sleeve; 6. a moving driving member; 61. a motor; 62. a screw rod; 63. a nut; 631. a chute; 632. an induction block; 7. a plunger pump; 71. a plunger rod; 72. a base; 721. a chamber; 722. a first air hole; 8. a slide bar; 9. a displacement sensor.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects solved by the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

It is to be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", "middle", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the utility model.

As shown in fig. 1 and 2, a pipette tip according to an embodiment of the present utility model includes a push rod 1, a pusher 2, a tip assembly 3, an elastic member 4, a housing 5 having an inner space 51, and a moving driving member 6 mounted on the housing 5; one end of the housing 5, which is far away from the moving driver 6, is provided with a first opening communicating with the inner space 51, one end of the ejector 2 is installed in the inner space 51, and the other end of the ejector 2 passes through the first opening; the ejector 2 is provided with an abutting part 311, the elastic piece 4 is sleeved on the ejector 2, and two opposite ends of the elastic piece 4 are respectively abutted with the abutting part 311 and the inner wall of the first opening; it is to be understood that the moving driver 6 includes, but is not limited to, a linear motor 61, a pneumatic cylinder, a hydraulic cylinder, a screw-nut mechanism, etc., and the elastic member 4 includes, but is not limited to, a spring, etc.; the end of the housing 5 remote from the first opening is provided with a second opening, and the movement driver 6 is mounted in a sealing manner at the edge of the second opening.

The ejector 2 is provided with a first through hole 21, one end of the ejector 2 extends into the inner space 51, and the other end of the ejector 2 passes through the first opening and is connected with the suction head assembly 3; it will be appreciated that the upper end of the ejector 2 is mounted in the interior space 51, and the lower end of the ejector 2 passes through the opening and abuts the outer wall of the suction head assembly 3.

The push rod 1 is installed in the inner space 51 and is positioned at one end of the movable driving piece 6, which is far away from the suction head assembly 3, and the ejector 2; the movable driving piece 6 is used for driving the unloader 2 to move through the push rod 1 so as to remove the suction head assembly 3. It will be appreciated that the push rod 1 includes, but is not limited to, a thimble, a cylinder, etc.

In the utility model, the movable driving member 6 pushes the push rod 1 downwards, the push rod 1 drives the unloader 2 to move downwards, the elastic member 4 is compressed by the unloader 2 which moves downwards, and the sucker assembly 3 is pushed downwards by the unloader 2 which moves downwards, so that the sucker assembly 3 is detached (namely, the detachment of the sucker assembly 3 is completed); in the process of downward movement of the ejector 2, the ejector 2 compresses the elastic piece 4, so that the downward movement stability of the ejector 2 is ensured, the accident that the suction head assembly 3 is damaged due to the shaking of the ejector 2 is avoided, and the assembly and disassembly stability of the suction head assembly 3 is ensured; in addition, the pipette tip has simple structure and low manufacturing cost.

In one embodiment, as shown in fig. 2 to 4, the suction head assembly 3 includes a suction head 31 and a connection pipe 32, one end of the connection pipe 32 is connected to the suction head 31, and the other end of the connection pipe 32 is inserted into the first through hole 21; the ejector 2 is used to push the suction head 31 out of the connection tube 32. It will be appreciated that the connection tube 32 is detachably connected to the suction head 31.

Specifically, the movable driving member 6 drives the unloader 2 to move downward through the push rod 1, and the lower end of the unloader 2 pushes the suction head 31 downward, so that the suction head 31 is pushed out from the connecting pipe 32; the push rod 1 will not press the ejector 2 downwards, by the upward movement of the moving drive 6; the resilience of the resilient member 4 will push the ejector 2 upwards to return the ejector 2. In this embodiment, the pipetting connector has a simple structure and is convenient to operate.

In an embodiment, as shown in fig. 2 to 4, the suction head 31 is provided with a plugging hole (not shown in the drawings), an abutment portion 311 is provided on an outer wall of the plugging hole, an end of the connecting pipe 32 away from the pusher 2 is plugged into the plugging hole, and an end of the pusher 2 away from the push rod 1 abuts against the abutment portion 311. As will be appreciated, the socket is provided at the upper end of the cleaner head 31; the upper end of the suction head 31 is detachably inserted into the insertion hole.

Specifically, the push-down pusher 2 will push down the suction head 31 through the abutment 311, so that the suction head 31 is pushed out of the connection tube 32; when the pipette tip 31 needs to be replaced, an external manipulator or the like drives the pipette tip to move downwards, so that the insertion hole of the other pipette tip 31 is inserted into the connecting pipe 32, and the replacement of the pipette tip 31 is completed. In this embodiment, the pipette tip is simple to operate.

In one embodiment, as shown in fig. 2 and 3, the pipette tip further comprises a plunger pump 7, the plunger pump 7 comprises a plunger rod 71 and a base 72 provided with a chamber 721, the base 72 is installed in the inner space 51, and a first air hole 722 communicating with the chamber 721 is further formed in the base 72; one end of the plunger rod 71 is inserted into the chamber 721, and the other end of the plunger rod 71 is connected to the movement driver 6; it will be appreciated that one end of the plunger rod 71 is sealingly inserted in the chamber 721 and that the plunger rod 1 is arranged at the periphery of the plunger rod 71.

One end of the connecting pipe 32 far away from the suction head 31 extends into the first through hole 21 and is connected with the base 72, and a second air hole 321 which is communicated with the first air hole 722 and the suction head 31 is arranged on the connecting pipe 32. It is to be appreciated that the end of the connecting tube 32 away from the suction head 31 is fixedly connected with the base 72, and the suction head 31 is provided with an adsorption through hole communicated with the second air hole 321.

Specifically, when the movement driver 6 moves the plunger rod 71 upward, the space of the chamber 721 will be increased, i.e., the chamber 721 will become a vacuum state; the vacuum chamber 721 drives the suction head 31 to absorb external liquid through the first air holes 722 and the second air holes 321, thereby completing the suction operation of the suction head 31. When the plunger rod 71 is moved downward by the moving driver 6, the air in the chamber 721 is pressed downward by the plunger rod 71, and the air in the suction head 31 is pushed out by the chamber 721 through the first air holes 722 and the second air holes 321, thereby completing the liquid squeezing operation of the suction head 31. In the embodiment, the pipetting tip has a simple structure and low manufacturing cost. It should be noted that, during the suction of the suction head 31, the moving driving member 6 does not drive the push rod 1 downward, that is, during the cleaning of the suction head 31, the suction head 31 is not pushed out from the connection pipe 32; further illustratively, the first stroke of the free end of the mobile drive 6 moving downwards is greater than the second stroke, the first stroke being: during the suction of the suction head 31, the movable driving member 6 drives the plunger rod 71 to move downwards by a distance; the second stroke is as follows: when the suction head 31 withdraws from the connecting pipe 32, the moving driving member 6 drives the push rod 1 to move downwards by a distance.

In one embodiment, as shown in fig. 1 and 2, the moving driving member 6 includes a motor 61, a screw rod 62, and a nut 63, the motor 61 is installed at an end of the housing 5 away from the first opening, an output end of the motor 61 is connected to the screw rod 62, and an end of the screw rod 62 away from the motor 61 is connected to the nut 63; the push rod 1 is mounted between the nut 63 and the ejector 2. As can be appreciated, the motor 61 is mounted on top of the housing 5, and the motor 61 can seal the second opening of the housing 5; the screw 62 and the nut 63 are both located in the inner wall space. In this embodiment, the motor 61 drives the screw 63 to move in the inner space 51 by using the screw 62, and the movement stability of the movement driving member 6 is high, and the movement stroke is large.

In one embodiment, as shown in fig. 3, the nut 63 is provided with a sliding groove 631, and the pipette tip further includes a sliding rod 8 mounted on the inner wall of the inner space 51, and the sliding rod 8 is inserted into the sliding groove 631. As can be appreciated, during the movement of the nut 63 in the inner space 51, the slide bar 8 slides in the slide slot 631, thereby ensuring the stability of the movement of the nut 63 in the inner space 51.

In one embodiment, as shown in fig. 3, the pipette tip further includes a displacement sensor 9 mounted on the inner wall of the inner space 51, a sensing groove is formed on the displacement sensor 9, and a sensing block 632 inserted into the sensing groove is formed on the nut 63. As can be appreciated, the displacement sensor 9 includes, but is not limited to, a laser sensor, etc., and the sensing block 632 slides in the sensing groove during the movement of the screw 63 in the internal space 51, so that the distance of the up and down movement of the screw 63 can be measured in real time.

In an embodiment, as shown in fig. 1 and 2, the housing 5 includes a first mounting seat 52, a second mounting seat 53, and a sleeve 54, the second mounting seat 53 is mounted between the first mounting seat 52 and the sleeve 54, the internal space 51 includes a first space 511 provided on the first mounting seat 52 and a second space 512 provided on the sleeve 54, and an end of the sleeve 54 remote from the second mounting seat 53 is provided with the first opening; the second mounting seat 53 is provided with a second through hole for communicating the first space 511 and the second space 512; it will be appreciated that the end of the first mounting block 52 remote from the second mounting block 53 is provided with a second opening.

The movable driving member 6 is mounted at one end of the first mounting seat 52 away from the second mounting seat 53, the unloader 2 is mounted in the second space 512, one end of the push rod 1 abuts against the movable driving member 6, and the other end of the push rod 1 passes through the second through hole and abuts against the unloader 2. It will be appreciated that during the up and down movement of the pusher 2, the push rod 1 moves in the second through hole. In this embodiment, the moving driving member 6 is installed in the first space 511 of the first mounting seat 52, the unloader 2 and the straw assembly are installed in the second space 512 of the sleeve 54, and the push rod 1 is installed in the second through hole of the second mounting seat 53, so that the user can conveniently overhaul each part in the first space 511 and the second space 512. Further, a third through hole is further provided on the second mounting seat 53, which communicates the first space 511 and the second space 512, one end of the plunger rod 71 is connected to the screw rod 62, and the other end of the plunger rod 71 passes through the third through hole and is inserted into the chamber 721.

In an embodiment, as shown in fig. 2, a protruding portion is disposed at an end of the second mounting seat 53 away from the first mounting seat 52, an external thread is disposed on the protruding portion, an internal thread is disposed on an inner wall of the second space 512, the protruding portion is inserted into the second space 512, and the external thread is in threaded connection with the internal thread. It can be appreciated that the sleeve 54 is detachably connected to the protruding portion of the second mounting seat 53 through the internal thread and the external thread, so that the assembly and disassembly between the sleeve 54 and the second mounting seat 53 are simple, and the user can conveniently overhaul the detacher 2 in the second space 512.

The utility model also provides a pipette, which comprises the pipette tip.

The above embodiments of the pipette tip and pipette of the present utility model are merely illustrative, and not intended to limit the present utility model, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model should be included in the scope of the present utility model.

Claims (10)

1. The pipetting tip is characterized by comprising a push rod, a pusher, a tip assembly, an elastic piece, a shell with an inner space and a movable driving piece arranged on the shell; one end of the shell, which is far away from the movable driving piece, is provided with a first opening communicated with the inner space, one end of the pushing and unloading device is arranged in the inner space, and the other end of the pushing and unloading device penetrates through the first opening; the ejector is provided with an abutting part, the elastic piece is sleeved on the ejector, and the opposite ends of the elastic piece are respectively abutted with the abutting part and the inner wall of the first opening;

the ejector is provided with a first through hole, one end of the ejector extends into the inner space, and the other end of the ejector penetrates through the first opening and is connected with the suction head assembly;

the push rod is arranged in the inner space and is positioned at one end, far away from the suction head assembly, of the movable driving piece and the pusher to be abutted; the movable driving piece is used for driving the unloader to move through the push rod so as to take down the suction head assembly.

2. The pipette tip of claim 1 wherein said tip assembly comprises a tip and a connecting tube, one end of said connecting tube being connected to said tip and the other end of said connecting tube being inserted into said first through hole; the ejector is used for pushing the suction head out of the connecting pipe.

3. The pipette tip of claim 2 wherein a plug hole is provided in the tip, an abutment is provided on an outer wall of the plug hole, an end of the connecting tube remote from the ejector is plugged in the plug hole, and an end of the ejector remote from the push rod abuts against the abutment.

4. The pipette tip of claim 2 further comprising a plunger pump, said plunger pump comprising a plunger rod and a base with a chamber, said base being mounted in said interior space and said base further having a first air vent communicating with said chamber; one end of the plunger rod is inserted into the cavity, and the other end of the plunger rod is connected with the moving driver;

one end of the connecting pipe, which is far away from the suction head, extends into the first through hole and is connected with the base, and a second air hole which is communicated with the first air hole and the suction head is formed in the connecting pipe.

5. The pipette tip of claim 1 wherein the movable drive comprises a motor, a screw and a nut, the motor being mounted at an end of the housing remote from the first opening, an output end of the motor being connected to the screw, an end of the screw remote from the motor being connected to the nut; the push rod is installed between the screw nut and the ejector.

6. The pipette tip of claim 5 wherein said nut is provided with a slide, said pipette tip further comprising a slide mounted on an inner wall of said interior space, said slide being inserted into said slide.

7. The pipette tip of claim 5 further comprising a displacement sensor mounted on an inner wall of the interior space, the displacement sensor having a sensing slot therein, the nut having a sensing block inserted into the sensing slot.

8. The pipette tip of claim 1 wherein said housing includes a first mount, a second mount and a sleeve, said second mount being mounted between said first mount and said sleeve, said interior space including a first space disposed on said first mount and a second space disposed on said sleeve, an end of said sleeve remote from said second mount being provided with said first opening; the second mounting seat is provided with a second through hole which is communicated with the first space and the second space;

the movable driving piece is arranged at one end, far away from the second mounting seat, of the first mounting seat, the pushing and unloading device is arranged in the second space, one end of the push rod is abutted to the movable driving piece, and the other end of the push rod passes through the second through hole and then is abutted to the pushing and unloading device.

9. The pipette tip of claim 8 wherein the end of the second mount remote from the first mount is provided with a protrusion having an external thread, the inner wall of the second space is provided with an internal thread, the protrusion is inserted into the second space, and the external thread is threadedly connected with the internal thread.

10. A pipette comprising a pipette tip as claimed in any one of claims 1 to 9.

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