Liquid suction needle assembly, liquid suction mechanism and analysis device

Abstract

The utility model provides a liquid suction needle assembly, a liquid suction mechanism and an analysis device, and relates to the technical field of medical instruments, a liquid suction needle base, a guide part, a separation part, a positioning part and a liquid suction needle are fixedly connected in sequence, a limiting block and a first elastic piece are arranged in the guide part, and the two ends of the first elastic piece abut against the limiting block and the liquid suction needle base respectively; the liquid suction needle is connected with the limiting block, so that the liquid suction needle drives the limiting block to move in the axial direction of the through hole; a cup pressing sleeve and a second elastic piece are arranged in the positioning part, the cup pressing sleeve is connected with the positioning part in a sliding and buckling mode, the two ends of the second elastic piece abut against the separation part and the cup pressing sleeve respectively, all components in the liquid suction needle assembly can limit the liquid suction needle in a limited mode, and certain buffering capacity is provided in the length direction of the liquid suction needle; the technical problems that in the prior art, due to the fact that an imbibition needle is poor in bottoming effectiveness and stability, imbibition is incomplete, imbibition residues are large, and then the monitoring and analysis result is affected are effectively solved, the imbibition effect is effectively guaranteed, and the accuracy of detection and analysis is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and in particular to a liquid aspiration needle assembly, a liquid aspiration mechanism and an analysis device. Background Art

[0002] In the existing technology, the technology of in vitro diagnosis based on the immune principle is constantly developing, and the demand for automation and intelligence of "sample in, result out" is getting higher and higher. Currently, most of the fully automatic chemiluminescence immunoassays and multiplex liquid chip immunoassay analyzers on the market can realize automatic sampling, on-demand incubation, automatic separation of analytes, and automatic analysis of test results.

[0003] In this process, the reaction liquid in the reaction cup needs to be cleaned frequently. Generally, fully automatic chemiluminescence immunoassays are equipped with a liquid pipette needle, which is inserted into the reaction cup to suck out the reaction liquid in the reaction cup and retain the magnetic beads or magnetic sheets in the reaction cup to achieve the cleaning of the reaction liquid in the reaction cup. In order to achieve a better cleaning effect, the magnetic beads and magnetic sheets can be separated from the reaction liquid on one side of the magnetic adsorption, and then the liquid pipette needle can be controlled to absorb the liquid.

[0004] However, due to the wide variety of reaction cup styles and structures, it is easy for the aspiration needle to incompletely aspirate liquid and cause large aspiration residues, which in turn affects the monitoring and analysis results. Designing a corresponding aspiration needle for each reaction cup will result in high design and production costs. Utility Model Content

[0005] The utility model aims to provide a liquid aspiration needle group, a liquid aspiration mechanism and an analysis device to alleviate the technical problem in the prior art that the reaction cups have various styles and structures, which easily lead to incomplete liquid aspiration by the liquid aspiration needle and large liquid aspiration residue, thereby affecting the monitoring and analysis results.

[0006] The utility model provides a liquid aspiration needle assembly, comprising:

[0007] A pipette needle, and a pipette needle seat, a guide portion, a partition portion and a positioning portion fixedly connected in sequence along the length direction of the pipette needle, wherein the pipette needle seat is provided with a first through hole, the guide portion is provided with a second through hole, the partition portion is provided with a third through hole, and the positioning portion is provided with a fourth through hole;

[0008] The positioning portion is provided with a cup pressing sleeve and a second elastic member, the cup pressing sleeve is provided with a fifth through hole, the cup pressing sleeve is connected with the positioning portion by sliding buckle, and two ends of the second elastic member are respectively in contact with the partition portion and the cup pressing sleeve;

[0009] The first through hole, the second through hole, the third through hole, the fourth through hole, and the fifth through hole are coaxially arranged, and the liquid suction needle is sequentially inserted into the first through hole, the second through hole, the third through hole, the fourth through hole, and the fifth through hole, and the liquid suction needle can move along the axial direction of the through hole;

[0010] A limit block and a first elastic member are provided in the guide portion. The limit block is sleeved outside the pipetting needle and fixedly connected to the pipetting needle. It can move along the axial direction of the through hole with the pipetting needle. The two ends of the first elastic member are respectively in contact with the limit block and the pipetting needle seat.

[0011] Furthermore, the needle head of the pipette needle is curved.

[0012] Furthermore, the limit block cannot rotate around the axis of the through hole; the limit block is provided with a threaded hole perpendicular to the extension direction of the pipette needle, and the top screw can pass through the threaded hole and abut against the pipette needle to fix the pipette needle; when the top screw is not abutting against the pipette needle, the pipette needle can rotate with its own axis; the side of the guide portion opposite to the top screw is provided with an opening.

[0013] Furthermore, the pipetting needle comprises a needle sleeve and a needle tube fixed to the needle sleeve.

[0014] Furthermore, a limiting portion is provided at one end of the needle sleeve away from the needle tube, and the limiting portion abuts against the outer side of the liquid aspiration needle seat.

[0015] Furthermore, a guide hole parallel to the length direction of the pipetting needle is provided on the side of the positioning portion, and the pressure cup sleeve is provided with a sliding buckle, and the sliding buckle slides along the guide hole.

[0016] Furthermore, the end surface of the cup pressing sleeve away from the partition portion is provided with symmetrical curved surface bone positions.

[0017] Furthermore, a first mounting hole is provided on the pipetting needle seat.

[0018] On the other hand, the utility model also provides a liquid aspiration mechanism, which also includes a liquid aspiration plate and the above-mentioned liquid aspiration needle assembly, the liquid aspiration plate is provided with a through hole and a second mounting hole opposite to the first mounting hole, the second mounting hole is annular, the liquid aspiration needle assembly is connected to the liquid aspiration plate through the first mounting hole and the second mounting hole, the through hole is coaxial with the first through hole, and the liquid aspiration needle can pass through the through hole.

[0019] Another aspect of the present invention provides an analysis device, comprising the above-mentioned liquid aspiration needle assembly or the above-mentioned liquid aspiration mechanism.

[0020] Beneficial effects:

[0021] The liquid pipetting needle assembly provided by the utility model comprises a liquid pipetting needle seat, a guide part, a partition part and a positioning part. The liquid pipetting needle seat, the guide part, the partition part and the positioning part, as well as the limit block and the cup pressing sleeve are respectively provided with a first through hole, a second through hole, a third through hole, a fourth through hole and a fifth through hole which are coaxially arranged. When the liquid pipetting needle inserted therein is inserted into the bottom of the reaction cup, it can be lifted up to adapt to the problem of the difference in the bottom contact of the liquid pipetting needle caused by reaction cups of different depths and installation (the distance required for the liquid pipetting needle to move to contact the bottom of the reaction cup is different). Each through hole performs preliminary circumferential restriction on the liquid pipetting needle to prevent the liquid pipetting needle from touching the bottom of the reaction cup when the needle head touches the bottom of the reaction cup. After that, shaking occurs; secondly, by setting a limit block in the guide part, the aspiration needle can be further restricted in the circumferential direction, and the first elastic member can be used to prevent the needle from being deformed or scratching the bottom of the reaction cup due to excessive squeezing force, while also making the needle stably contact with the bottom of the reaction cup to completely aspirate the liquid; further, by setting a cup pressing sleeve and a corresponding second elastic member in the positioning part, the cup pressing sleeve can tightly press the mouth of the reaction cup to ensure that each aspiration needle touches the bottom of the reaction cup and the position consistency after extension and contraction, and avoid shaking and component damage during the cup pressing process. The aspiration needle assembly of the utility model solves the technical problems of incomplete aspiration and large aspiration residue of the aspiration needle in the prior art, which in turn affects the monitoring and analysis results. It has the advantages of good compatibility with bottoming difference, good and stable bottoming consistency, anti-scratch bottom, and less aspiration residue, which can effectively ensure the aspiration process and improve the accuracy of detection and analysis.

[0022] The utility model also provides a liquid aspiration mechanism, including a liquid aspiration plate. A second annular mounting hole corresponding to the first mounting hole is provided on the liquid aspiration plate, so that the liquid aspiration needle assembly can relatively adjust its fixed position with the liquid aspiration plate, and then adjust the position between the liquid aspiration needle and the reaction cup, thereby avoiding the liquid aspiration needle from colliding with or scratching the inner wall of the reaction cup; at the same time, it ensures that the needle head of the liquid aspiration needle can abut against the bottom of the reaction cup after it descends, thereby reducing the amount of liquid aspiration residue in the reaction cup.

[0023] The utility model also provides an analysis device, including the above-mentioned liquid aspiration needle assembly or liquid aspiration mechanism, which has all the advantages of the above-mentioned liquid aspiration needle assembly or liquid aspiration mechanism compared with the prior art, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A sectional view of the overall structure of the liquid aspiration needle assembly provided by the utility model;

[0026] Figure 2 An exploded view of the overall structure of the liquid aspiration needle assembly provided by the utility model;

[0027] Figure 3 The structure of the liquid pipette needle assembly provided by the utility model when it is inserted into the reaction cup;

[0028] Figure 4 The overall structure diagram of the liquid aspiration needle assembly provided by the utility model;

[0029] Figure 5 This is a partial structural sectional view of the liquid suction mechanism provided by the utility model.

[0030] icon:

[0031] 10. Aspiration needle assembly;

[0032] 110, a pipette needle seat; 111, a first through hole; 112, a first mounting hole; 120, a guide portion; 121, a second through hole; 122, an opening; 130, a partition portion; 131, a third through hole; 140, a positioning portion; 141, a fourth through hole; 142, a guide hole;

[0033] 200, aspiration needle; 210, needle cover; 211, limiting part; 220, needle tube; 221, needle;

[0034] 310, limit block; 312, threaded hole; 320, first elastic member; 330, top screw;

[0035] 410, cup pressing sleeve; 411, sliding buckle; 412, arc surface bone position; 413, fifth through hole; 420, second elastic member;

[0036] 20. Liquid suction plate; 201. Through hole; 202. Second mounting hole;

[0037] 30. Reaction cup. DETAILED DESCRIPTION

[0038] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] The present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0040] The pipette needle assembly 10 provided in the embodiment of the utility model can be used in automated pipetting equipment and is generally fixed on the pipette plate 20 of an automatic luminescent immunoassay instrument. A reaction cup 30 is arranged below the pipette needle seat 110 corresponding to the pipette needle assembly 10. The pipette plate 20 will drive the pipette needle assembly 10 to rise and fall, so that the pipette needle 200 in the pipette needle assembly 10 can extend into the bottom of the reaction cup 30, and then suck out the reaction liquid in the reaction cup 30.

[0041] like Figures 1 to 4 As shown, the utility model provides a liquid pipette needle assembly 10, including: a liquid pipette needle 200, and a liquid pipette needle seat 110, a guide portion 120, a partition portion 130 and a positioning portion 140 fixedly connected in sequence along the length direction of the liquid pipette needle 200, the liquid pipette needle seat 110 is provided with a first through hole 111, the guide portion 120 is provided with a second through hole 121, the partition portion 130 is provided with a third through hole 131, and the positioning portion 140 is provided with a fourth through hole 141.

[0042] Furthermore, a cup pressing sleeve 410 and a second elastic member 420 are provided in the positioning portion 140. The cup pressing sleeve 410 is provided with a fifth through hole 413. The cup pressing sleeve 410 is connected to the positioning portion 140 by a sliding buckle. Both ends of the second elastic member 420 are respectively in contact with the partition portion 130 and the cup pressing sleeve 410.

[0043] The first through hole 111, the second through hole 121, the third through hole 131, the fourth through hole 141 and the fifth through hole 413 are coaxially arranged; the liquid pipetting needle 200 is sequentially inserted into the first through hole 111, the second through hole 121, the third through hole 131, the fourth through hole 141 and the fifth through hole 413.

[0044] Since the pipette needle 200 is sleeved in the through hole formed by the pipette needle seat 110, the guide part 120, the partition part 130 and the positioning part 140 (the needle head 221 is located on the side close to the positioning part 140), the pipette needle 200 can move up and down along the through hole; that is, when the needle head 221 moves downward to touch the bottom of the reaction cup 30, since there is no obstruction at the upper end of the pipette needle 200, the pipette needle 200 can move upward to prevent the needle head 221 from being excessively squeezed to cause deformation or scratching the bottom of the reaction cup 30. And this setting can better adapt to the reaction cups 30 of different depths, and improve the height difference tolerance of the pipette needle 200 when installing, such as: after any pipette needle assembly 10 is disassembled and reinstalled, the distance between its needle head and the reaction cup 30 changes; or, when multiple pipette needle assemblies 10 are installed on the same pipette plate, the distances between different needle heads and the reaction cup 30 may not be exactly the same. And the first through hole 111 and the third through hole 131 have a certain circumferential limiting effect on the pipette needle 200, which can prevent the pipette needle 200 from shaking during the lifting movement. Preferably, the pipette needle seat 110, the guide part 120, the partition part 130 and the positioning part 140 can be made of integral injection molding so that the four are fixedly connected. The first through hole 111 is a geometric center circular hole that is arranged through the pipette needle seat 110. The guide part 120, the partition part 130 and the positioning part 140 are arranged on one side of the pipette needle seat 110 in sequence, coaxial with the first through hole 111. And the size of the third through hole 131 is smaller than the aperture of the second through hole 121 and the fourth through hole 141, so that the partition part 130 has a certain separation effect and can contact with the components arranged in the guide part 120 and the positioning part 140.

[0045] Furthermore, a limit block 310 and a first elastic member 320 are also provided in the guide portion 120. The limit block 310 is sleeved on the outside of the pipette needle 200 and is connected to the pipette needle 200. The limit block 310 can move along the axial direction of the through hole with the pipette needle 200. The two ends of the first elastic member 320 are respectively abutted against the limit block 310 and the pipette needle seat 110.

[0046] Since the limit block 310 is fixedly connected to the pipette needle 200, it can have a certain limiting effect on the circumference of the pipette needle 200. Preferably, the cross-sectional shape of the limit block 310 is different from the shape of the inner wall of the second through hole 121, and the limit block 310 cannot rotate along the axis of the through hole in the second through hole 121. In this embodiment, the inner wall of the second through hole 121 is circular, and the limit block 310 can be set to a square. And when the pipette needle 200 slides up and down in the through hole, the limit block 310 can slide in the second through hole 121 of the guide part 120. Since the limit block 310 is arranged in the second through hole 121 of the guide part 120, it can only move in the second through hole 121, thereby limiting the moving distance of the pipette needle 200. Preferably, the stroke D of the pipette needle 200 in the guide portion 120 is greater than the length C of the pipette needle 200 extending out of the pressure cup sleeve 410 to ensure that the pipette needle 200 will not be damaged due to an excessive amount of contraction.

[0047] The first elastic member 320 provided in the second through hole 121 can be specifically configured as a spring, which is sleeved on the outer side of the pipette needle 200, with one end abutting against the pipette needle seat 110, and the other end abutting against the stop block 310. When the pipette plate 20 moves downward to the bottom of the reaction cup 30, the pipette needle 200 will be lifted up by the bottom of the reaction cup 30, and the stop block 310 connected thereto will also be lifted up, so that the first elastic member 320 is compressed, and a downward elastic force is applied to the stop block 310 and the pipette needle 200, thereby ensuring that the pipette needle 200 can always abut against the bottom of the reaction cup 30, so as to achieve the purpose of completely sucking out the reaction liquid in the reaction cup 30.

[0048] Furthermore, the pipette needle assembly 10 provided in the embodiment of the utility model is configured with a second elastic member 420 between the cup pressing sleeve 410 and the partition 130, so that the cup pressing sleeve 410 can tightly press the cup mouth of the reaction cup 30 to ensure that each pipette needle 200 touches the bottom of the reaction cup 30 and maintains a consistent position after extension and retraction.

[0049] The second elastic member 420 is specifically configured as a light spring, which is sleeved on the pipette needle 200, with one end thereof abutting against the partition 130, and the other end abutting against the cup pressing sleeve 410. The cup pressing sleeve 410 can be configured to be made of elastic materials such as rubber. When the pipette needle assembly 10 as a whole is lowered along with the pipette plate 20, the cup pressing sleeve 410 will first contact the reaction cup 30 and press on the top of the reaction cup 30 to stabilize the relative position of the reaction cup 30 and the washing needle assembly 10. As the pipetting needle assembly 10 continues to descend, the pipetting needle 200 moves toward the bottom of the reaction cup 30, the cup pressing sleeve 410 slides upward along the fourth through hole 141, and the second elastic member 420 is compressed, exerting a downward pressing force on the cup pressing sleeve 410, thereby tightly pressing the cup pressing sleeve 410. The setting of the elastic member has a certain buffering effect, which can prevent the cup pressing sleeve 410 from excessively squeezing the reaction cup 30 when it contacts the reaction cup 30, causing damage to the reaction cup 30 or the pipetting assembly 10, and can also ensure the consistency of the position of each pipetting needle 200 touching the bottom of the reaction cup 30. Preferably, the fifth through hole 311 is a stepped circular hole, the first-order aperture close to the partition 130 is larger, and the first-order aperture away from the partition 130 is smaller, so that it can accommodate the second elastic member 420 and abut against one end of the second elastic member 420.

[0050] In this embodiment, the top of the pipette needle 200 slides in the first through hole 111, and the middle of the pipette needle 200 slides in the third through hole 131 of the partition 130. The first through hole 111 and the third through hole 131 will limit the pipette needle 200 in the circumferential direction to prevent the pipette needle 200 from shaking during the lifting movement. Since the limit block 310 is also sleeved on the pipette needle 200, and the limit block 310 slides in the second through hole 121, the second through hole 121 and the limit block 310 will further limit the pipette needle 200 in the circumferential direction to prevent it from shaking, and cooperate with the cup pressure sleeve 410 to press the reaction cup 30 to ensure the stability of the bottoming position of the pipette needle 200.

[0051] Preferably, the pipetting needle 200 includes a needle sleeve 210 and a needle tube 220 fixed to the needle sleeve 210 .

[0052] Specifically, the needle tube 220 of the aspiration needle 200 can be made of glass or plastic material, and the needle sleeve 210 of the aspiration needle 200 can be made of wear-resistant elastic material such as rubber. The pillowcase 210 and the needle tube 220 have connected through holes for aspiration. In this embodiment, the limit block 310 is fixed on the needle sleeve 210, and the needle sleeve 210 slides in the first through hole 111 and the third through hole 131, and further extends to the fourth through hole 141; the needle tube 220 is fixed at the bottom of the needle sleeve 210 and passes through the fifth through hole 413. The pillowcase 210 is thicker than the needle tube 220. Therefore, by setting the contact position between the pipetting needle 200 and the pipetting needle seat 110, the partition 130 and the limit block 310 on the wear-resistant needle sleeve 210, the overall wear resistance of the pipetting needle 200 can be improved, and the needle tube 220 can be prevented from colliding with the side wall and causing damage during the up and down movement, thereby extending the service life of the pipetting needle 200; and the setting of the pillowcase 210 makes it easier to fix the pipetting needle 200 and the limit block 310, so as to avoid damage to the needle tube 220 or unstable fixation caused by direct fixation of the needle tube 220 and the limit block 310.

[0053] Furthermore, the needle head 221 of the pipetting needle 200 is curved.

[0054] Specifically, the axial direction of the needle 221 of the liquid aspiration needle 200 is set at a certain angle to the axial direction of the needle tube 220, so that the needle of the liquid aspiration needle 200 is bent. In conjunction with the magnetic module, the needle 221 can be facing away from or away from the adsorption and gathering place of the magnetic beads and magnetic sheets to aspirate liquid, effectively solving the impact of the flow rate during the liquid aspiration process and the negative pressure when the liquid at the bottom of the reaction cup 30 is sucked empty on the magnetic beads and magnetic sheets, and reducing loss. The angle a between the axial direction of the needle 221 of the liquid aspiration needle 200 and the axial direction of the needle tube 220 is between 135° and 180° to prevent the needle 221 from being damaged when it is pressed against the bottom of the reaction cup 30.

[0055] When there are multiple groups of liquid suction needle assemblies 10 to carry out liquid suction action under the same control device, it is difficult to meet that the liquid suction direction is completely correct when multiple groups of liquid suction needle assemblies 10 are installed. Thus, it is necessary to adjust the angle of liquid suction needle 200 so that needle head 221 can face away from the adsorption position.

[0056] In this embodiment, the needle sleeve 210 of the pipette needle 200 is cylindrical as a whole. When the cross-sectional shape of the stop block 310 is the same as the inner wall shape of the second through hole 121, that is, when the stop block 310 can rotate around the axis of the pipette needle, the pipette needle 200 can also rotate around its own axis in the through hole, so that the needle head 221 can be rotated to any angle, and the direction of the needle head 221 of the pipette needle 200 can be adjusted. After the needle head 221 of the pipette needle 200 is bent, the needle head 221 and the bending dimension B are less than half of the inner diameter A of the reaction cup 30, so as to avoid the pipette needle 200 from colliding with the cup wall of the reaction cup 30 after the rotation angle, and leave an adjustable range between the needle head 221 of the pipette needle 200 and the inner wall of the reaction cup 30.

[0057] Preferably, the stopper block 310 cannot rotate around the axis of the pipette needle. Accordingly, the stopper block 310 is provided with a threaded hole 312 that passes through the stopper block 310 and extends to the position of the pipette needle 200. Preferably, the threaded hole 312 is perpendicular to the extension direction of the pipette needle 200. A top screw 330 that can pass through the threaded hole 312 and abut against the pipette needle 200 can be further provided to fix the pipette needle 200, that is, when the top screw 330 is not abutted against the pipette needle 200, the pipette needle 200 can rotate along its own axis to adjust the direction of the needle 221. After adjustment, the pipette needle 200 is fixed by the top screw 330 to prevent the pipette needle 200 from rotating, thereby fixing the direction of the needle 221.

[0058] Specifically, in order for the stop block 310 and the top screw 330 to enter the guide portion 120, the side of the guide portion 120 (i.e., the side wall parallel to the length direction of the liquid-absorbing needle) is provided with an opening 122 for facilitating the entry of the top screw and even the stop block 310. The threaded hole 312 is arranged on the side of the stop block 310 facing the opening 122 to facilitate the screwing of the top screw 330. The top screw 330 is screwed with the threaded hole 312 through the opening 122, and finally abuts against the needle sleeve 210 of the liquid-absorbing needle 200 to fix the liquid-absorbing needle 200 to prevent the liquid-absorbing needle 200 from rotating, deviating or rotating during the process of lifting and lowering the liquid-absorbing needle. When it is necessary to adjust the direction of the needle head 221 of the liquid-absorbing needle 200, the top screw 330 can be loosened, the liquid-absorbing needle 200 can be rotated and fine-tuned so that the needle head 221 is facing away from the adsorption position, and then the top screw 330 can be tightened again.

[0059] Furthermore, if Figure 4 The end surface of the cup pressing sleeve 410 in contact with the reaction cup is provided with an arc surface bone position 412. Preferably, the arc surface bone position 412 is symmetrically arranged.

[0060] Specifically, in this embodiment, four arc-surface bone positions 412 are provided, and they are symmetrically arranged in pairs along the end surface where the cup pressing sleeve 410 contacts the reaction cup, and each arc-surface bone position is a smooth strip-shaped protrusion extending from the outer periphery of the end surface of the cup pressing sleeve 410 to the center of the fifth through hole 413. Preferably, the arc-surface bone position 412 is integrally formed with the cup pressing sleeve 410. When the cup pressing sleeve 410 presses the mouth of the reaction cup 30, the arc-surface bone position 412 will be in line contact with the top of the reaction cup 30, thereby effectively preventing the end surface from abutting against the reaction cup 30 to form a negative pressure environment or the mouth of the reaction cup 30 from being adsorbed on the end surface due to factors such as splashing liquid at the mouth of the reaction cup 30, resulting in problems such as cup jamming, cup collision, and contamination.

[0061] Preferably, a limiting portion 211 is provided at one end of the needle sleeve 210 away from the needle tube 220 , and the limiting portion 211 abuts against the outer side of the liquid aspiration needle seat 110 .

[0062] Specifically, the limiting portion 211 is integrally molded with the needle sleeve 210. The area of ​​the limiting portion 211 is larger than the aperture of the upper end surface of the first through hole 111, so that the limiting portion 211 can abut against the outer side of the liquid pipetting needle seat 110, thereby limiting the downward movement of the liquid pipetting needle 200.

[0063] Furthermore, a first mounting hole 112 is provided on the pipetting needle seat 110 .

[0064] Preferably, the first mounting hole 112 can be configured as four recessed holes, which are respectively disposed at the four corners of the pipette needle seat 110 , so as to facilitate the pipette needle assembly 10 to be firmly fixed on the pipette plate 20 by bolt connection.

[0065] like Figure 5 As shown, another aspect of the utility model provides a liquid aspiration mechanism, which also includes a liquid aspiration plate 20 and at least one of the above-mentioned liquid aspiration needle assemblies 10. The liquid aspiration plate 20 is provided with a through hole 201 and a second mounting hole 202 corresponding to the first mounting hole 112. The liquid aspiration needle assembly 10 is connected to the liquid aspiration plate 20 via the first mounting hole 112 and the second mounting hole 202, and the liquid aspiration needle 200 can pass through the through hole 201.

[0066] Preferably, the second mounting hole 202 is arranged in an annular shape, and its aperture is larger than the mounting size of the first mounting hole 112. The pipette needle assembly 10 is fixed to the pipette plate 20 by bolts penetrating the first mounting hole 112 and the second mounting hole 202. Since the second mounting hole 202 is annular, the installation position of the pipette needle assembly 10 is relatively adjustable. Therefore, the distance between the pipette needle 200 and the reaction cup 30 can be adjusted accordingly to avoid collision and scratching the inner wall of the reaction cup 30. At the same time, by adjusting the distance between the pipette needle 200 and the reaction cup 30, it can also be ensured that the needle head 221 can reach the bottom of the reaction cup 30 after descending, thereby effectively controlling the amount of residual liquid in the reaction cup 30 to be minimized.

[0067] The utility model also provides an analysis device, including the above-mentioned liquid aspiration needle assembly 10 or liquid aspiration mechanism, and a device for driving the liquid aspiration needle assembly 10 or liquid aspiration mechanism. Compared with the prior art, it has all the advantages of the above-mentioned liquid aspiration needle assembly 10 or liquid aspiration mechanism, which will not be repeated here.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A pipette needle assembly, characterized in that: include: A pipette needle, and a pipette needle seat, a guide portion, a partition portion and a positioning portion fixedly connected in sequence along the length direction of the pipette needle, wherein the pipette needle seat is provided with a first through hole, the guide portion is provided with a second through hole, the partition portion is provided with a third through hole, and the positioning portion is provided with a fourth through hole; The positioning portion is provided with a cup pressing sleeve and a second elastic member, the cup pressing sleeve is provided with a fifth through hole, the cup pressing sleeve is connected with the positioning portion by sliding buckle, and two ends of the second elastic member are respectively in contact with the partition portion and the cup pressing sleeve; The first through hole, the second through hole, the third through hole, the fourth through hole, and the fifth through hole are coaxially arranged, and the liquid suction needle is sequentially inserted into the first through hole, the second through hole, the third through hole, the fourth through hole, and the fifth through hole, and the liquid suction needle can move along the axial direction of the through hole; A limit block and a first elastic member are provided in the guide portion. The limit block is sleeved outside the pipetting needle and connected to the pipetting needle. It can move along the axial direction of the through hole with the pipetting needle. The two ends of the first elastic member are respectively in contact with the limit block and the pipetting needle seat.

2. The liquid aspiration needle assembly according to claim 1, characterized in that: The needle head of the liquid-pipetting needle is curved.

3. The liquid aspiration needle assembly according to claim 2, characterized in that: The limit block cannot rotate with the axis of the through hole as the axis. The limit block is provided with a threaded hole perpendicular to the extension direction of the pipette needle. The top screw can pass through the threaded hole and abut against the pipette needle to fix the pipette needle. When the top screw is not abutting against the pipette needle, the pipette needle can rotate with its own axis as the axis. The side of the guide portion opposite to the top screw is provided with an opening.

4. The liquid aspiration needle assembly according to claim 3, characterized in that: The liquid-pipetting needle comprises a needle sleeve and a needle tube fixed to the needle sleeve.

5. The liquid aspiration needle assembly according to claim 4, characterized in that: A limiting portion is provided at one end of the needle sleeve away from the needle tube, and the limiting portion abuts against the outer side of the liquid aspiration needle seat.

6. The liquid aspiration needle assembly according to claim 1, characterized in that: A guide hole parallel to the length direction of the pipetting needle is provided on the side of the positioning portion, and a sliding buckle is provided on the pressure cup sleeve, and the sliding buckle slides along the guide hole.

7. The liquid aspiration needle assembly according to claim 1, characterized in that: The end surface of the cup pressing sleeve away from the partition portion is provided with symmetrical curved surface bone positions.

8. The liquid aspiration needle assembly according to any one of claims 1 to 7, characterized in that: The pipetting needle seat is provided with a first mounting hole.

9. A liquid suction mechanism, characterized in that: The liquid aspiration mechanism also includes a liquid aspiration plate and a liquid aspiration needle assembly as described in claim 8, wherein the liquid aspiration plate is provided with a through hole and a second mounting hole opposite to the first mounting hole, the second mounting hole is annular, and the liquid aspiration needle assembly is connected to the liquid aspiration plate through the first mounting hole and the second mounting hole, the through hole is coaxial with the first through hole, and the liquid aspiration needle can pass through the through hole.

10. An analysis device, characterized in that: It comprises the liquid aspiration needle assembly as described in any one of claims 1 to 8, or the liquid aspiration mechanism as described in claim 9.

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