Pasteur pipette support for assisted reproduction laboratory

By designing a Pasteur straw bracket including an electric push rod and an adjustment mechanism, the problem of liquid reflux and microbial contamination caused by the straw storage rack, and the problem of slippage caused by the arc-shaped grooves cannot adapt to the problem of straws caused by different diameters, the stable storage and use of straws is achieved.

CN119771538AInactive Publication Date: 2025-04-08SHIJIAZHUANG PEOPLES HOSPITAL
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Patent Information

Application Number
CN202510205018.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-24
Publication Date
2025-04-08
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

In the prior art, the horizontal placement of Pasteur straw storage rack causes liquid to flow back, increase the resistance of the straw and may lead to microbial contamination; while the fixed diameter of the arc-shaped groove cannot adapt to straws of different diameters, causing the straw to slip and fall and damage.

Method used

A Pasteur straw holder for assisted reproductive laboratory is designed, including a base, storage plate, electric push rod, push piece and adjustment mechanism. The electric push rod drives the storage plate to tilt to solve the problem of liquid return; the diameter of the elastic sheet in the arc groove is adjusted through the adjustment mechanism to adapt to straws of different diameters.

Benefits of technology

It effectively prevents liquid backflow, reduces the resistance of the straw, avoids microbial contamination, and through the design of the adjustment mechanism, it ensures that the straws of different diameters can be stably held and avoids slipping and damage.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a Pasteur suction pipe support for an assisted reproduction laboratory. The Pasteur suction pipe support comprises a base, a storage plate, an electric push rod, a push piece and an adjusting mechanism. Mounting rods are symmetrically arranged on the base; an electric push rod is detachably connected to the middle of the base; storage plates are arranged on the mounting rod in an array mode, and a push piece is arranged on an output shaft of the electric push rod. A through groove is formed in the middle of the storage plate and connected with the pushing piece; mounting seats are symmetrically arranged on the front and rear sides of the storage plate; arc-shaped grooves are formed in the mounting base in an array mode, and a mounting groove mounting adjusting mechanism is formed in the mounting base. The adjusting mechanism comprises an adjusting rod, an elastic piece, an ejector rod and a sleeve. Two ends of the elastic sheet are fixedly connected with the arc-shaped grooves; the lower end of the elastic sheet is provided with the screw connecting sleeve; ejector rods are symmetrically arranged on the two sides of the arc-shaped groove and abut against the outer walls of the two ends of the elastic piece; the bottom of the mounting seat is rotationally connected with an adjusting rod; the adjusting rod is provided with a plurality of bevel gears connected with the lower end of the sleeve.
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Description

Technical Field

[0001] The invention relates to the technical field of equipment for assisted reproduction laboratories, and in particular to a Pasteur pipette support for assisted reproduction laboratories. Background Art

[0002] The Reproductive Medicine Laboratory is a laboratory closely related to reproductive health, integrating clinical, experimental and scientific research. The laboratory is not used for general experiments, but after years of clinical examination experience, it has manufactured equipment suitable for reproductive medicine examinations to more accurately detect the causes of male and female infertility;

[0003] Pasteur pipette, also known as Pasteur pipette or transfer pipette, is the most common experimental tool in reproductive laboratories. It is mainly used for: aspiration, transfer or carrying of small amounts of liquid in cell experiments, clinical trials, cloning experiments, etc. It is widely used in genetics, medicine, epidemic prevention, clinical, biochemistry, petrochemical, military and other fields;

[0004] 1. During the experiment, the experimenters often need to use Pasteur pipettes of various calibers. For example, the transfer of eggs or cleavage-stage embryos requires Pasteur pipettes of 150-200um caliber; and the transfer of blastocysts requires Pasteur pipettes of 200-250um caliber. If the various Pasteur pipettes are not classified and stored, they are easy to be confused during use, affecting the experimental results and wasting the time of medical staff. The classification storage racks of Pasteur pipettes in the prior art take up space and are inconvenient to use.

[0005] 2. At present, Pasteur straws are fixed by the arc groove on the storage rack whether they are used or transported. However, Pasteur straws have many calibers, and the arc groove is an arc groove of fixed caliber, which makes it impossible for the arc groove to fit the Pasteur straws. As a result, the Pasteur straws are easy to slip and fall during storage and transportation.

[0006] 3. In the prior art, Pasteur straw storage racks are generally placed horizontally on the storage racks. The outer and inner walls of the used Pasteur straws are stained with a small amount of liquid, which will flow back to the tail due to gravity. The liquid on the inner wall of the straw may flow back to the cotton ball at the tail, so that the next time the straw is used, the gas cannot pass through the cotton ball at the tail smoothly, and the straw resistance increases and cannot absorb the liquid. The liquid outside the straw may flow back to the contaminated area touched by the fingers in the middle and rear parts of the Pasteur straw. When the straw is used again, the contaminated liquid flows back to the tip of the straw again, resulting in microbial contamination. Summary of the invention

[0007] In order to solve the problem of Pasteur pipette storage rack in the prior art, the present invention discloses a Pasteur pipette rack for assisted reproductive laboratory;

[0008] The present invention is realized through the following technical solutions:

[0009] A Pasteur pipette holder for an assisted reproductive laboratory, comprising: a base, a storage plate, an electric push rod, a pushing member, and an adjusting mechanism;

[0010] Mounting rods are symmetrically arranged on the base, and the electric push rod is detachably connected to the middle of the base;

[0011] The storage plates are arranged in an array on the mounting rods, and the pushing member is arranged on the output shaft of the electric push rod;

[0012] A through groove is opened in the middle of the storage plate to connect the pushing member, and mounting seats are symmetrically arranged on the front and back sides of the storage plate; arc-shaped grooves are arranged in an array on the mounting seats, and an adjusting mechanism is installed in the mounting grooves inside the mounting seats;

[0013] The adjusting mechanism includes an adjusting rod, an elastic piece, a top rod, and a sleeve; both ends of the elastic piece are fixedly connected to the arc-shaped grooves, and a screw rod is arranged at the lower end of the elastic piece to connect the sleeve; top rods are symmetrically arranged on both sides of the arc-shaped grooves to abut against the outer walls of both ends of the elastic piece, and the bottom of the arc-shaped groove is rotatably connected to the sleeve; the bottom of the mounting seat is rotatably connected to the adjusting rod; a number of bevel gears are arranged on the adjusting rod to connect the lower end of the sleeve, and a number of relatively arranged top rods are arranged in an array on the adjusting rod and are threadedly connected to the top rods;

[0014] Furthermore, a number of mounting shafts are arranged in an array on the mounting rods to connect one end of the storage plate, the pushing member is a U-shaped frame, and a number of push rods are arranged in an array on the pushing member to connect the through grooves on the storage plate; the distance between a number of the mounting shafts is equal to the distance between a number of the push rods; the axis of the lowermost push rod is 2-4 cm higher than the axis of the lowermost mounting shaft;

[0015] Furthermore, the upper end of the sleeve is rotatably connected to the wall of the arc-shaped groove, the inside of the sleeve is threadedly connected to the screw rod, and the lower end of the sleeve is provided with a first bevel gear to connect the bevel gear;

[0016] Furthermore, the adjusting rod is a screw rod, and bevel gears are arranged in an array on the adjusting rod at positions corresponding to the arc-shaped grooves to connect the sleeve; relatively installed top rods are symmetrically arranged on both sides of the bevel gears on the adjusting rod; threads with the same pitch and opposite helix directions are arranged on both sides of the bevel gears on the adjusting rod;

[0017] Furthermore, the lower end of the top rod is threadedly connected to the adjusting rod, and the upper end of the top rod is flush with the axis of the arc-shaped groove; by rotating the adjusting rod, the relatively arranged top rods are controlled to approach synchronously, and the first bevel gear is driven by the bevel gear to drive the sleeve to drive the screw rod to move up and down, controlling the screw rod and the relatively arranged top rods to approach or move away from the axis of the arc-shaped groove synchronously, and adjusting the elastic piece to form arc-shaped elastic pieces with different diameters;

[0018] The beneficial effects of the present invention are:

[0019] The present invention discloses a Pasteur pipette holder for assisted reproduction laboratories, comprising: a base, a storage plate, an electric push rod, a push piece, and an adjustment mechanism; a mounting frame is symmetrically arranged at the rear end of the base, and a mounting shaft is arranged on the mounting frame to connect one end of the storage plate, and an electric push rod is arranged at the lower end of the base to connect the push piece, and a push rod is arranged on the push piece and installed in a through groove, and the push piece is driven to move forward and backward by controlling the electric push rod, and the push rod moves in the slide groove to drive the storage plate to rotate around the mounting shaft, and the inclination angle of the storage plate is adjusted, so as to solve the problem in the prior art that the Pasteur pipette storage rack is generally placed horizontally on the storage rack, and the outer wall and inner wall of the used Pasteur pipette will be stained with a small amount of liquid, resulting in the next time the pipette is used, the gas cannot pass through the cotton ball at the tail smoothly, and the pipette resistance increases and cannot absorb the liquid. The liquid outside the pipette may flow back to the contaminated area touched by the fingers in the middle and rear part of the Pasteur pipette, and when the pipette is used again, the contaminated liquid flows back to the tip of the pipette again, thereby causing the problem of microbial contamination;

[0020] A storage plate and an adjustment mechanism are provided, and the push rod is driven to approach or move away synchronously by rotating the adjustment rod, and the synchronously rotating bevel gear drives the first bevel gear to drive the sleeve to move, so as to control the up and down movement of the screw rod, and the push rod and the screw rod are synchronously arranged to approach or move away from the axis of the arc groove at equal distances to control the diameter adjustment of the elastic sheet in the arc groove, so as to adapt to the stable clamping of Pasteur straws of different calibers, and solve the problem in the prior art that the Pasteur straws are fixed by the arc groove on the storage rack whether they are used or transported, but the calibers of the Pasteur straws are numerous, and the arc grooves are arc grooves of fixed calibers, so that the arc grooves cannot fit the Pasteur straws for fixing, and the Pasteur straws are easy to slip and fall during the storage and transportation process;

[0021] In addition, different storage plates can adjust the diameter of the elastic sheet through an adjusting mechanism to form Pasteur pipettes of different calibers that can be classified and stored. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required for describing the embodiment are briefly introduced below.

[0023] Figure 1 It is a schematic diagram of the overall structure of a Pasteur pipette stand for use in assisted reproductive laboratories;

[0024] Figure 2 The present invention is a schematic diagram of the structure of a storage plate of a Pasteur pipette holder for assisted reproduction laboratories;

[0025] Figure 3 It is a partial enlarged structural schematic diagram of a Pasteur pipette support used in assisted reproductive laboratories;

[0026] Figure 4It is a schematic diagram of the structure of an adjustment mechanism of a Pasteur pipette stand for use in assisted reproduction laboratories;

[0027] Figure 5 The present invention is a schematic diagram of the structure of a storage plate of a Pasteur pipette holder for assisted reproduction laboratories;

[0028] Figure 6 The present invention is a schematic diagram of the structure of an elastic sheet of a Pasteur pipette support used in an assisted reproductive laboratory;

[0029] Figure 7 The present invention is a schematic diagram of the structure of a sleeve of a Pasteur pipette support for assisted reproduction laboratories;

[0030] Figure 8 The present invention is a schematic diagram of the structure of a screw rod of a Pasteur pipette support for assisted reproduction laboratories.

[0031] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0032] 1-base, 101-mounting frame, 1011-mounting shaft, 201-electric push rod, 202-push piece, 2021-push rod, 3-adjusting mechanism, 301-storage plate, 302-mounting seat, 303-arc groove, 304-elastic sheet, 3041-screw, 3031-mounting groove, 305-adjusting rod, 306-top rod, 307-sleeve. DETAILED DESCRIPTION

[0033] In order to solve the problems existing in the prior art Pasteur pipette holder for assisted reproductive laboratories, the present invention discloses a Pasteur pipette holder for assisted reproductive laboratories, comprising: a base 1, a storage plate 301, an electric push rod 2021201, a push piece 202, and an adjustment mechanism 3;

[0034] The base 1 is symmetrically provided with mounting rods, and the middle part of the base 1 is detachably connected to the electric push rod 2021201;

[0035] The storage plates 301 are arranged in an array on the mounting rod, and the push piece 202 is arranged on the output shaft of the electric push rod 2021201;

[0036] A through slot is provided in the middle of the storage plate 301 to connect the push piece 202, and mounting seats 302 are symmetrically provided on the front and rear sides of the storage plate 301; arc slots 303 are arranged in an array on the mounting seat 302, and a mounting slot 3031 is provided inside the mounting seat 302 to install the adjustment mechanism 3;

[0037] The adjusting mechanism 3 comprises an adjusting rod 305, an elastic sheet 304, a push rod 306 and a sleeve 307; the two ends of the elastic sheet 304 are fixedly connected to the arc groove 303, and a screw 3041 is arranged at the lower end of the elastic sheet 304 to connect the sleeve 307; push rods 306 are symmetrically arranged on both sides of the arc groove 303 to top the outer walls of the two ends of the elastic sheet 304, and the bottom of the arc groove 303 is rotatably connected to the sleeve 307; the bottom of the mounting seat 302 is rotatably connected to the adjusting rod 305; a plurality of bevel gears are arranged on the adjusting rod 305 to connect the lower end of the sleeve 307, and a plurality of push rods 306 arranged opposite to each other are arranged in an array on the adjusting rod 305 and are threadedly connected to the push rods 306;

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0039] Example 1

[0040] like Figure 1 The figure shows the overall structure of the present invention. In the present invention, a Pasteur pipette holder for assisted reproduction laboratory is disclosed, which is provided with a base 1, a storage plate 301, an electric push rod 2021201, a push piece 202, and an adjustment mechanism 3;

[0041] The base 1 is symmetrically provided with mounting rods, and the middle part of the base 1 is detachably connected to the electric push rod 2021201;

[0042] The storage plates 301 are arranged in an array on the mounting rod, and the push piece 202 is arranged on the output shaft of the electric push rod 2021201;

[0043] A through slot is provided in the middle of the storage plate 301 to connect the push piece 202, and mounting seats 302 are symmetrically provided on the front and rear sides of the storage plate 301; arc slots 303 are arranged in an array on the mounting seat 302, and a mounting slot 3031 is provided inside the mounting seat 302 to install the adjustment mechanism 3;

[0044] The adjusting mechanism 3 comprises an adjusting rod 305, an elastic sheet 304, a push rod 306 and a sleeve 307; the two ends of the elastic sheet 304 are fixedly connected to the arc groove 303, and a screw 3041 is arranged at the lower end of the elastic sheet 304 to connect the sleeve 307; push rods 306 are symmetrically arranged on both sides of the arc groove 303 to top the outer walls of the two ends of the elastic sheet 304, and the bottom of the arc groove 303 is rotatably connected to the sleeve 307; the bottom of the mounting seat 302 is rotatably connected to the adjusting rod 305; a plurality of bevel gears are arranged on the adjusting rod 305 to connect the lower end of the sleeve 307, and a plurality of push rods 306 arranged opposite to each other are arranged in an array on the adjusting rod 305 and are threadedly connected to the push rods 306;

[0045] In this embodiment, a number of mounting shafts 1011 are arranged in an array on the mounting rod to connect one end of the storage plate. The pusher 202 is a U-shaped frame, and a number of push rods 2021 are arranged in an array on the pusher 202 to connect the through slots on the storage plate. The distance between several of the mounting shafts 1011 is equal to the distance between several of the push rods 2021. The axis of the lowermost push rod 2021 is 2-4 cm higher than the axis of the lowermost mounting shaft 1011.

[0046] In this embodiment, the upper end of the sleeve 307 is rotatably connected to the wall of the arc-shaped groove 303. A screw rod 3041 is threadedly connected inside the sleeve 307, and a first bevel gear is arranged at the lower end of the sleeve 307 to connect with a bevel gear.

[0047] In this embodiment, the adjusting rod 305 is a screw rod 3041. Bevel gears are arranged in an array on the adjusting rod 305 corresponding to the position of the arc-shaped groove 303 to connect with the sleeve 307. Oppositely installed ejector rods 306 are symmetrically arranged on both sides of the bevel gear on the adjusting rod 305. Threads with the same pitch and opposite helix directions are arranged on both sides of the bevel gear on the adjusting rod 305.

[0048] In this embodiment, the lower end of the ejector rod 306 is threadedly connected to the adjusting rod 305, and the upper end of the ejector rod 306 is flush with the axis of the arc-shaped groove 303. By rotating the adjusting rod 305, the oppositely arranged ejector rods 306 are controlled to approach synchronously, and the first bevel gear is driven by the bevel gear to drive the sleeve 307 to drive the screw rod 3041 to move up and down, controlling the screw rod 3041 and the oppositely arranged ejector rods 306 to approach or move away from the axis of the arc-shaped groove 303 synchronously, and adjusting the elastic piece 304 to be formed into arc-shaped elastic pieces 304 with different diameters.

[0049] In this embodiment, by controlling the electric push rod 2021201 to drive the pusher 202 to move back and forth, the push rod 2021 moves in the chute to drive the storage plate 301 to rotate around the mounting shaft 1011, adjusting the inclination angle of the storage plate 301, and solving the problem in the prior art that the Pasteur pipette storage rack is generally horizontally placed on the storage rack. A small amount of liquid will adhere to both the outer wall and the inner wall of the used Pasteur pipette, resulting in the inability of gas to pass smoothly through the cotton ball at the tail when using the pipette next time, and the resistance of the pipette increases and it is unable to suck the liquid. And the liquid outside the pipette may flow back to the contaminated area contacted by the finger in the middle and rear part of the Pasteur pipette. When using the pipette again, the already contaminated liquid flows back to the tip of the pipette again, resulting in the occurrence of microbial contamination.

[0050] In this embodiment, the push rod 306 is driven to approach or move away synchronously by rotating the adjusting rod 305, and the synchronously rotating bevel gear drives the first bevel gear driving sleeve 307 to move, so as to control the screw rod 3041 to move up and down, and the push rod 306 and the screw rod 3041 which are relatively arranged are synchronously approached or moved away from the axis of the arc groove 303 at an equal distance, so as to control the diameter adjustment of the elastic sheet 304 in the arc groove 303, so as to adapt to the stable clamping of Pasteur straws of different calibers, and solve the problem in the prior art that the Pasteur straws are fixed by the arc groove 303 on the storage rack whether they are used or transported, but the calibers of the Pasteur straws are numerous, and the arc groove 303 is an arc groove 303 of a fixed caliber, so that the arc groove 303 cannot fit the Pasteur straws for fixing, resulting in the problem that the Pasteur straws are easy to slip and fall during the storage and transportation process;

[0051] Furthermore, different storage plates 301 can adjust the diameter of the elastic sheet 304 through the adjustment mechanism 3 to form Pasteur pipettes of different calibers that can be classified and stored.

[0052] In summary, the present invention discloses a Pasteur pipette holder for assisted reproductive laboratories, comprising: a seat, a storage plate 301, an electric push rod 2021201, a push piece 202, and an adjustment mechanism 3; a mounting frame 101 is symmetrically arranged at the rear end of the base 1, and a mounting shaft 1011 is arranged on the mounting frame 101 to connect one end of the storage plate 301, and an electric push rod 2021201 is arranged at the lower end of the base 1 to connect the push piece 202, a push rod 2021 is arranged on the push piece 202 and is installed in a slide groove, and the push piece 202 is driven to move back and forth by controlling the electric push rod 2021201, and the push rod 2021 moves in the slide groove to drive the storage plate 301 to rotate around the mounting shaft 1011, and the inclination angle of the storage plate 301 is adjusted, so as to solve the problem in the prior art that the Pasteur pipette storage rack is generally placed horizontally on the storage rack, and the outer wall and the inner wall of the used Pasteur pipette will be stained with a small amount of liquid, resulting in that when the pipette is used next time, the gas cannot pass through the cotton ball at the tail smoothly, and the resistance of the pipette increases and the liquid cannot be absorbed. The liquid on the outside of the pipette may flow back to the contaminated area in the middle and rear part of the Pasteur pipette where the finger touches. When the pipette is used again, the contaminated liquid flows back to the tip of the pipette, causing microbial contamination.

[0053] A storage plate 301 and an adjusting mechanism 3 are provided, and the push rod 306 is driven to approach or move away synchronously by rotating the adjusting rod 305, and the synchronously rotating bevel gear drives the first bevel gear driving sleeve 307 to move, so as to control the screw rod 3041 to move up and down, and the push rod 306 and the screw rod 3041 that are relatively arranged are synchronously approached or moved away from the axis of the arc groove 303 at equal distances, so as to control the diameter adjustment of the elastic sheet 304 in the arc groove 303, so as to adapt to the stable clamping of Pasteur straws of different calibers, and solve the problem in the prior art that the Pasteur straws are fixed by the arc groove 303 on the storage rack whether they are used or transported, but the calibers of the Pasteur straws are numerous, and the arc groove 303 is an arc groove 303 of a fixed caliber, so that the arc groove 303 cannot fit the Pasteur straws for fixing, resulting in the problem that the Pasteur straws are easy to slip and fall during the storage and transportation process;

[0054] Furthermore, different storage plates 301 can adjust the diameter of the elastic sheet 304 through the adjustment mechanism 3 to form Pasteur pipettes of different calibers that can be classified and stored.

[0055] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only the specific implementation methods described.

Claims

1. A Pasteur pipette holder for assisted reproductive laboratory, characterized in that: Including: Base, storage board, electric push rod, pushing member, adjusting mechanism; Mounting rods are symmetrically arranged on the base, and the electric push rod is detachably connected to the middle of the base; Storage boards are arranged in an array on the mounting rods, and a pushing member is arranged on the output shaft of the electric push rod; A through groove is formed in the middle of the storage board to connect the pushing member, and mounting seats are symmetrically arranged on the front and rear sides of the storage board; Arc-shaped grooves are arranged in an array on the mounting seats, and an installation groove is formed inside the mounting seat to install the adjusting mechanism; The adjusting mechanism includes an adjusting rod, an elastic piece, a top rod, and a sleeve; Both ends of the elastic piece are fixedly connected to the arc-shaped groove, and a screw rod is arranged at the lower end of the elastic piece to connect the sleeve; Top rods are symmetrically arranged on both sides of the arc-shaped groove to abut against the outer walls of both ends of the elastic piece, and the bottom of the arc-shaped groove is rotatably connected to the sleeve; The bottom of the mounting seat is rotatably connected to the adjusting rod; A number of bevel gears are arranged on the adjusting rod to connect the lower end of the sleeve, and a number of oppositely arranged top rods are arranged in an array on the adjusting rod and are threadedly connected to the top rod.

2. A Pasteur pipette holder for assisted reproduction laboratory according to claim 1, characterized in that: A number of mounting shafts are arranged in an array on the mounting rod to connect one end of the storage board, the pushing member is a U-shaped frame, and a number of push rods are arranged in an array on the pushing member to connect the through grooves on the storage board; The distance between several of the mounting shafts is equal to the distance between several of the push rods; The axis of the lowermost push rod is 2-4 cm higher than the axis of the lowermost mounting shaft.

3. A Pasteur pipette holder for assisted reproduction laboratory according to claim 1, characterized in that: The upper end of the sleeve is rotatably connected to the wall body of the arc-shaped groove, the screw rod is threadedly connected inside the sleeve, and a first bevel gear is arranged at the lower end of the sleeve to connect the bevel gear.

4. A Pasteur pipette holder for assisted reproduction laboratory according to claim 1, characterized in that: The adjusting rod is a screw rod, and bevel gears are arranged in an array on the adjusting rod at positions corresponding to the arc-shaped grooves to connect the sleeve; Oppositely installed top rods are symmetrically arranged on the adjusting rod on both sides of the bevel gear; Threads with the same pitch and opposite helix directions are arranged on the adjusting rod on both sides of the bevel gear.

5. The Pasteur pipette holder for assisted reproduction laboratory according to claim 1, characterized in that: The lower end of the top rod is threadedly connected to the adjusting rod, and the upper end of the top rod is flush with the axis of the arc-shaped groove; By rotating the adjusting rod, the oppositely arranged top rods are controlled to approach synchronously, and the first bevel gear is driven by the bevel gear to drive the sleeve to drive the screw rod to move up and down, controlling the screw rod and the oppositely arranged top rods to approach or move away from the axis of the arc-shaped groove synchronously, and adjusting the elastic piece to form an arc-shaped elastic piece with different diameters.