CN219842199U

CN219842199U - Puncture needle and coagulation analyzer

Info

Publication number: CN219842199U
Application number: CN202320972567.XU
Authority: CN
Inventors: 谢永华; 邓延记
Original assignee: Shanghai Sunbio Technology Co ltd
Current assignee: Shanghai Sunbio Technology Co ltd
Priority date: 2023-04-25
Filing date: 2023-04-25
Publication date: 2023-10-17
Anticipated expiration: 2033-04-25

Abstract

The disclosed penetration needle includes a first nozzle, a second nozzle, and a connection assembly. The first nozzle is provided with a liquid guide cavity, a liquid suction needle hole communicated with the liquid guide cavity is formed in the needle tip end of the first nozzle, and the first end of the first nozzle is used for being inserted into the sampling tube and sucking sample liquid through the liquid suction needle hole. The second nozzle is provided with an infusion cavity communicated with the liquid guide cavity, can store the sample liquid sucked by the liquid guide cavity, and the flow area of the infusion cavity is larger than that of the liquid guide cavity. In use, the second nozzle need not be inserted into the sampling tube, and only the sample fluid need be stored. The connecting component comprises a connecting piece which is respectively connected with the first nozzle and the second nozzle so as to realize the reliable connection between the first nozzle and the second nozzle and the transportation of the sample liquid between the liquid guide cavity and the transfusion cavity.

Description

Puncture needle and coagulation analyzer

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a puncture needle and a coagulation analyzer.

Background

The blood coagulation analyzer is a clinically necessary in vitro detection device and is mainly used for risk assessment of wound operation and diagnosis and prevention and treatment of cardiovascular and cerebrovascular diseases. Along with the aggravation of the aging degree of society, the incidence rate of cardiovascular and cerebrovascular diseases is increased, the daily processing sample size of hospitals is continuously increased, and higher requirements are also put forward on the automation degree and the processing speed of a coagulation analyzer. The puncture needle is applied to a sample injection module of the coagulation analyzer, and has the functions of directly puncturing a blood collection tube rubber cap to absorb a blood sample, then transferring the sample into a sufficient cup or a reaction cup, and eliminating the need of manual uncapping or additional uncapping instruments or components, so that the labor intensity of operators and the risk of biological infection can be greatly reduced, and the working efficiency of the coagulation analyzer is effectively improved.

The puncture needle configured by the coagulation analyzer in the market at present has the capacity of about 200 microliters and smaller capacity, and the main body adopts an integrated reducer. However, the small-capacity puncture needle cannot absorb enough samples at a time for the instrument to test, and cannot meet the application requirements of the full-automatic coagulation analyzer with high processing speed and multiple test items. To increase the volume of the puncture needle, thicker and longer stainless steel pipes are needed, and the diameter-variable pipe forming process is limited, so that a high-quality diameter-variable pipe with a large diameter-variable range and relatively slender diameter cannot be processed at present. If the diameter-changing range is too large, the diameter-changing tube may be broken in the stretching process, or the strength of the puncture needle is insufficient, and the puncture needle is easy to break in the using process. The thicker the stainless steel tube of the puncture needle puncture part is, the larger the force required in the puncture process is, the puncture difficulty is improved, and the requirement on the fixing strength of the needle fixing piece is higher. In addition, the larger the volume of the puncture needle is, the larger the initial capacitance is, and the smaller the change rate of the capacitance of the contact liquid is, so that the liquid level detection of the puncture needle is not facilitated.

Therefore, how to increase the capacity of the puncture needle of the coagulation analyzer is a technical problem to be solved by those skilled in the art.

Disclosure of Invention

In view of the above, an object of the present utility model is to provide a puncture needle for increasing the capacity of a puncture needle of a coagulation analyzer.

The utility model aims to provide a coagulation analyzer which comprises the puncture needle.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

a puncture needle comprising:

the liquid suction device comprises a first nozzle, a second nozzle and a liquid suction device, wherein a liquid guide cavity is formed in the first nozzle;

the second nozzle is provided with an infusion cavity communicated with the liquid guide cavity, and the flow area of the infusion cavity is larger than that of the liquid guide cavity;

the connecting assembly comprises a connecting piece, and the connecting piece is respectively connected with the first nozzle and the second nozzle so as to be communicated with the liquid guide cavity and the transfusion cavity.

Optionally, in the above puncture needle, the connector includes:

the first connecting block is respectively connected with the first nozzle and the second nozzle, and is provided with a first connecting hole which is respectively communicated with the liquid guide cavity and the transfusion cavity;

the second connecting block is provided with a second connecting hole, the first connecting block is arranged in the second connecting hole, and the first nozzle and the second nozzle respectively extend out from two ends of the second connecting hole.

Optionally, in the above puncture needle, the flow area of the first connection hole is larger than the flow area of the liquid guiding cavity and smaller than the flow area of the infusion cavity.

Optionally, in the above puncture needle, a first chamfer structure is provided at an end of the liquid guiding cavity near the first connecting hole, and a flow area of an end of the first chamfer structure near the second nozzle is larger than a flow area of an end far away from the second nozzle; and/or the number of the groups of groups,

the first connecting hole is close to one end of the second nozzle and is provided with a second chamfer structure, and the flow area of one end of the second chamfer structure close to the first nozzle is smaller than that of one end far away from the first nozzle.

Optionally, in the above puncture needle, the first end of the first connecting block is a conical structure, the second end is a cylindrical structure, one end of the first nozzle away from the liquid suction pinhole is embedded into the conical structure, and an outer sidewall of the first connecting block is attached to an inner sidewall of the second connecting hole.

Optionally, in the puncture needle, a first positioning boss is disposed on an outer sidewall of the first connection block, and the second nozzle is abutted to the first positioning boss.

Optionally, in the puncture needle, the second nozzle is disposed in an outer cylinder, and one end of the connecting piece is embedded in the outer cylinder;

the connecting assembly further comprises a needle fixing piece, a fixing hole is formed in the needle fixing piece, the connecting piece is arranged in the fixing hole, the first nozzle and the second nozzle extend out of two ends of the fixing hole respectively, and one end of the outer cylinder is embedded into the fixing hole.

Optionally, in the puncture needle described above, a conical structure is formed at an end of the connecting member away from the second nozzle, the first nozzle penetrates through the conical structure, and an outer side wall of the connecting member is attached to an inner side wall of the needle fixing member.

Optionally, in the above puncture needle, the puncture needle further comprises a spacer member disposed between the outer tube and the second nozzle.

Optionally, in the puncture needle, the connecting piece is provided with a second positioning boss, and the outer cylinder abuts against the second positioning boss.

Optionally, in the above puncture needle, the liquid suction needle hole is opened on a side wall of the first nozzle, and the liquid suction needle hole is in smooth transition communication with the liquid guide cavity.

Optionally, in the puncture needle, a gas leakage groove is formed on a side wall of the first nozzle.

Optionally, in the puncture needle, the needle tip of the first nozzle has a prismatic structure.

A coagulation analyzer comprises the puncture needle.

The utility model provides a puncture needle which comprises a first nozzle, a second nozzle and a connecting assembly. The first nozzle is provided with a liquid guide cavity, a liquid suction needle hole communicated with the liquid guide cavity is formed in the needle tip end of the first nozzle, and the first end of the first nozzle is used for being inserted into the sampling tube and sucking sample liquid through the liquid suction needle hole. The second nozzle is provided with an infusion cavity communicated with the liquid guide cavity, can store the sample liquid sucked by the liquid guide cavity, and the flow area of the infusion cavity is larger than that of the liquid guide cavity. In use, the second nozzle need not be inserted into the sampling tube, and only the sample fluid need be stored. The connecting component comprises a connecting piece which is respectively connected with the first nozzle and the second nozzle so as to realize the reliable connection between the first nozzle and the second nozzle and the transportation of the sample liquid between the liquid guide cavity and the transfusion cavity.

Compared with the prior art, the first nozzle of the puncture needle can be inserted into the sampling tube and can absorb sample liquid, the flow area of the infusion cavity of the second nozzle is larger than that of the liquid guide cavity, so that the volume and the puncture effect of the first nozzle are not influenced while the absorption capacity of the sample liquid is increased through the second nozzle, the influence on the liquid level detection sensitivity is avoided, the connection assembly realizes reliable connection and fixation of the first nozzle and the second nozzle, and the risk of puncture needle breakage caused by overlarge puncture force is avoided.

The coagulation analyzer disclosed by the embodiment of the utility model comprises the puncture needle, so that the coagulation analyzer has the advantages as above, and is not repeated here.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view showing the structure of a puncture needle according to an embodiment of the present utility model;

FIG. 2 is a partial sectional view of the puncture needle according to the embodiment of the present utility model;

FIG. 3 is a partial sectional view showing the first nozzle of the puncture needle according to the embodiment of the present utility model;

fig. 4 is a sectional view showing still another partial structure of the first nozzle of the puncture needle according to the embodiment of the present utility model.

Wherein 100 is a first nozzle, 101 is a liquid guide cavity, 110 is a liquid suction pinhole, 120 is a gas leakage groove, 200 is a connecting component, 210 is a first connecting block, 211 is a first connecting hole, 220 is a second connecting block, 230 is a needle fixing piece, 300 is a second nozzle, 301 is a transfusion cavity, 400 is a protective shell, 410 is a protective shell cover, 420 is an outer cylinder, 500 is a two-core shielding wire, 600 is a pipe joint, 700 is a first isolation sleeve, and 710 is a second isolation sleeve.

Detailed Description

The core of the utility model is to disclose a puncture needle for increasing the capacity of a puncture needle of a coagulation analyzer.

Another core of the present utility model is to disclose a coagulation analyzer comprising the above-mentioned puncture needle.

Hereinafter, embodiments will be described with reference to the drawings. Furthermore, the embodiments shown below do not limit the summary of the utility model described in the claims. The whole contents of the constitution shown in the following examples are not limited to the solution of the utility model described in the claims.

Referring to fig. 1 and 2, the disclosed penetration needle includes a first nozzle 100, a second nozzle 300, and a connection assembly 200. The first nozzle 100 is provided with a liquid guide cavity 101, a liquid suction needle hole 110 communicated with the liquid guide cavity 101 is formed at the needle tip end of the first nozzle 100, and the first end of the first nozzle 100 is used for being inserted into a sampling tube and sucking sample liquid through the liquid suction needle hole 110. The second nozzle 300 is provided with an infusion chamber 301 communicating with the liquid guiding chamber 101, and is capable of storing the sample liquid sucked by the liquid guiding chamber 101, and the flow area of the infusion chamber 301 is larger than that of the liquid guiding chamber 101. In use, the second nozzle 300 need not be inserted into a sampling tube, and only the storage of the sample fluid is required.

The connection assembly 200 includes connection members that are respectively connected to the first nozzle 100 and the second nozzle 300 to achieve the transfer of the sample fluid between the fluid guide chamber 101 and the fluid transfer chamber 301 while achieving a reliable connection between the first nozzle 100 and the second nozzle 300.

Compared with the prior art, the first nozzle 100 of the puncture needle disclosed in the embodiment of the utility model can be inserted into a sampling tube and realize the suction of sample liquid, the flow area of the infusion cavity 301 of the second nozzle 300 is larger than that of the liquid guide cavity 101, so that the suction capacity of the sample liquid is increased through the second nozzle 300, the volume and the puncture effect of the first nozzle 100 are not influenced, the influence on the liquid level detection sensitivity is avoided, the first nozzle 100 and the second nozzle 300 can be respectively processed and prepared, the production difficulty is reduced, the connection assembly 200 realizes the reliable connection and fixation between the first nozzle 100 and the second nozzle 300, and the risk of the puncture needle breakage caused by overlarge puncture force is avoided.

In a specific embodiment of the present disclosure, the connection member includes a first connection block 210 and a second connection block 220. The first connecting block 210 is connected with the first nozzle 100 and the second nozzle 300 respectively, and the first connecting block 210 is provided with a first connecting hole 211, and two ends of the first connecting hole 211 are communicated with the liquid guiding cavity 101 and the transfusion cavity 301 respectively. The second connection block 220 is provided with a second connection hole, the first connection block 210 is disposed in the second connection hole, and the first nozzle 100 and the second nozzle 300 respectively protrude from both ends of the second connection hole (the first nozzle 100 protrudes from a first end of the second connection hole, and the second nozzle 300 protrudes from a second end of the second connection hole).

As shown in fig. 2, the first end of the first connecting block 210 is sleeved on the outer side wall of the first nozzle 100, the second end of the first connecting block 210 is attached to the inner side wall of the infusion cavity 301, and the sample liquid in the liquid guiding cavity 101 can enter the infusion cavity 301 through the first connecting hole 211.

In order to reduce the residual of the sample fluid between the first connection block 210 and the first nozzle 100 and the second nozzle 300, the flow area of the first connection hole 211 is larger than the flow area of the fluid guiding chamber 101 and smaller than the flow area of the fluid transferring chamber 301.

As shown in fig. 2, the end of the liquid guiding cavity 101 near the first connecting hole 211 is a first chamfer structure, and the flow area of the end of the first chamfer structure near the second nozzle 300 is larger than the flow area of the end far from the second nozzle 300.

Further, the flow area of the end of the first chamfer structure close to the second nozzle 300 is greater than or equal to the flow area of the first connecting hole 211, and the flow area of the end far from the second nozzle 300 is equal to the flow area of the liquid guiding cavity 101.

The end of the first connecting block 210 near the second nozzle 300 is a second chamfer structure, and the flow area of the end of the second chamfer structure near the first nozzle 100 is smaller than that of the end far from the first nozzle 100

Further, the flow area of the end of the second chamfer structure close to the first nozzle 100 is equal to the flow area of the infusion chamber 301, and the flow area of the end far from the first nozzle 100 is equal to the flow area of the first connecting hole 211.

The transition of the first connecting hole 211 between the liquid guiding cavity 101 and the liquid transferring cavity 301 can be realized through the first chamfering structure and the second chamfering structure, which is beneficial to the flow of the sample and the cleaning liquid in the needle and reduces the residue of the sample liquid.

Referring to fig. 2, in order to improve structural strength, the first end of the first connection block 210 has a conical structure, the second end has a cylindrical structure, and one end of the first nozzle 100, which is far away from the liquid suction pinhole 110, is embedded into the conical structure, and the outer sidewall of the first connection block 210 is attached to the inner sidewall of the second connection hole. The conical structure of the first connection block 210 may realize the transition and positioning of the connection between the first connection block 210 and the first nozzle 100, and correspondingly, the second connection hole may be configured to be in a fitting structure with the outer surface of the first connection block 210.

As shown in fig. 2, the first connection hole 211 may be designed as a stepped hole structure, a large-bore end of the first connection hole 211 is tack-welded with the first nozzle 100, and a small-bore end of the first connection hole 211 has a diameter between an inner diameter and an outer diameter of the first nozzle 100. The second chamfer structure is disposed at the small-bore end of the first connecting hole 211. And the diameter of the large-aperture end of the first connection hole 211 is equal to the outer diameter of the first nozzle 100, the stepped hole structure can effectively reduce the volume of the first connection block 210 and facilitate positioning with the second connection block 220.

In order to facilitate positioning between the first connection block 210 and the second nozzle 300, a first positioning boss (shoulder structure) is provided on an outer sidewall of the first connection block 210, and the second nozzle 300 is positioned in abutment with the first positioning boss, and simultaneously, the volume of the first connection block 210 is effectively reduced.

In a specific embodiment of the present disclosure, the second nozzle 300 is disposed in the outer cylinder 420, and one end of the connector is embedded in the outer cylinder 420. The connection assembly 200 further includes a needle fixing member 230, the needle fixing member 230 is provided with a fixing hole, the connection member is disposed in the fixing hole, the first nozzle 100 and the second nozzle 300 respectively extend from both ends of the fixing hole, and one end of the outer cylinder 420 is embedded into the fixing hole. After the connector connects the first nozzle 100 and the second nozzle 300, the needle holder 230 may strengthen the connection of the connector, reducing the risk of breakage.

The needle holder 230 is used for fixing the puncture needle, and the puncture needle can be held stably by the needle holder 230 during the puncture process, so that the puncture needle cannot slide up and down during the puncture process. The coupling strength of the coupling member with the first nozzle 100 and the second nozzle 300 can be further enhanced by providing the needle holder 230.

As shown in fig. 2, the second connection block 220 is disposed in the needle holder 230, and the first nozzle 100 and the second nozzle 300 protrude from both ends of the second connection hole, respectively (the first nozzle 100 protrudes from the first end of the needle holder 230, and the second nozzle 300 protrudes from the second end of the needle holder 230).

In order to improve the reliability of the connection, one end of the second connection block 220 (connection member) remote from the second nozzle 300 is formed with a conical structure through which the first nozzle 100 passes, and an outer sidewall of the second connection block 220 (connection member) is attached to an inner sidewall of the needle holder 230. The conical configuration of the second connection block 220 (connection piece) facilitates positioning with the needle mount 230. Correspondingly, the needle fixing member 230 is provided with a conical hole structure which is attached to the conical structure of the second connection block 220 to ensure positioning accuracy and fixing strength. Wherein the diameter of the cylindrical structure of the second connection block 220 (connection member) is equal to the outer diameter of the second nozzle 300.

As shown in fig. 2, the fixing hole is a circular hole, the diameter of the first end is the same as the outer diameter of the first nozzle 100, the diameter of the second end is the same as the outer diameter of the second nozzle 300, and the fixing hole is provided with a conical hole structure for positioning and matching with the second connection block 220.

As shown in fig. 1, the first end of the needle holder 230 may have a cylindrical structure with a larger cross-sectional area, and the second end may have a square block structure, and the middle may be transited by the cylindrical structure with a smaller cross-sectional area, so as to be convenient for adapting to different installation scenes.

The second nozzle 300 is disposed in the outer cylinder 420, one end of the connecting member is embedded in the outer cylinder 420, and the outer cylinder 420 is embedded in the fixing hole. That is, one end of the outer cylinder 420 is interposed between the needle holder 230 and the connector, and the second nozzle 300 is disposed in the outer cylinder 420, and the outer cylinder 420 can support the second nozzle 300.

As shown in fig. 2, in order to facilitate positioning between the second connection block 220 (connection piece) and the outer cylinder 420, a second positioning boss (shoulder structure) is provided on the outer sidewall of the second connection block 220, and the outer cylinder 420 is positioned after abutting against the second positioning boss, so that the volume of the second connection block 220 is effectively reduced.

In order to achieve the isolation between the second nozzle 300 and the outer barrel 420, the disclosed lancet according to the embodiment of the present utility model further includes an isolation assembly disposed between the outer barrel 420 and the second nozzle 300.

Specifically, the isolation assembly includes a first isolation sleeve 700 and a second isolation sleeve 710. The first spacer 700 and the second spacer 710 are disposed between the outer cylinder 420 and the second nozzle 300, and the first spacer 700 is disposed at both ends of the second spacer 710. The first spacer 700 at both ends may form a space between the outer cylinder 420 and the second nozzle 300, and the second spacer 710 may be a sleeve sleeved on the second nozzle 300.

Wherein, the first spacer 700 may be an ABS plastic spacer, and the second spacer 710 may be a thermoplastic tube. As shown in fig. 2, the second connection block 220 can achieve fixation of the outer tub 420 and ensure isolation of the outer tub 420 from before the first connection block 210.

The first nozzle 100 is a puncture needle puncture and imbibition part, in order to optimize the internal flow channel of the puncture needle, as shown in fig. 3, the imbibition needle hole 110 is arranged on the side wall of the first nozzle 100, so that the imbibition needle hole 110 can be prevented from being blocked by rubber plug fragments in the puncture process, the imbibition needle hole 110 is in smooth transition communication with the liquid guide cavity 101, dead angles can be avoided, the flow of sample liquid or flushing liquid is smoother, and the risk of cross contamination is reduced.

Referring to fig. 4, the sidewall of the first nozzle 100 is provided with one or two air leakage grooves 120, the specific length of the air leakage grooves 120 can be designed according to practical situations, when the vacuum blood collection tube rubber plug is pierced, the air leakage grooves 120 can quickly restore the pressure in the blood collection tube to the atmospheric pressure, so that the puncture needle is convenient to suck samples, and meanwhile, the friction between the puncture needle and the rubber plug can be reduced when the puncture needle is lifted.

The tip portion of the first nozzle 100 is designed in a prismatic structure, which can effectively reduce penetration resistance, and is advantageous for penetration, for example, designed in a triangular prismatic structure.

As shown in fig. 1, a protective case 400 may be disposed at one end of the outer cylinder 420 far from the first nozzle 100, one end of the protective case 400 far from the first nozzle 100 is closed with a protective case cover 410, the second nozzle 300 passes through the protective case cover 410 and is connected with the pipe joint 600, two core shielding wires 500 are disposed in the protective case 400, red wires of the two core shielding wires 500 are welded and fixed with the second nozzle 300, black wires of the two core shielding wires are welded and fixed with the outer cylinder 420, welding points of the two core shielding wires 500 are disposed in the protective case 400, and the protective case 400 is filled with an insulating adhesive to fix and protect welding wires and wire bundles and is covered with the protective case cover 410.

In a specific embodiment disclosed in the present utility model, the first nozzle 100 and the second nozzle 300 are made of stainless steel, the first connection block 210 is made of stainless steel, the second connection block 220 is made of ABS plastic, the needle holder 230 and the outer cylinder 420 are made of ABS plastic, the protective housing 400 and the protective housing cover 410 are made of ABS plastic, and the pipe joint 600 is made of stainless steel. The second connecting block 220 and the needle fixing member 230 are made of ABS plastic, so that the influence on the liquid level sensing sensitivity of the puncture needle can be avoided.

The first connection block 210 and the second nozzle 300 are welded and fixed, the first nozzle 100 and the needle fixing member 230 are fixed by an insulating adhesive, the outer cylinder 420 and the needle fixing member 230 are fixed by an insulating adhesive, the protective housing 400 and the outer cylinder 420, and the protective housing cover 410 and the second nozzle 300 are fixed by an insulating adhesive, and the pipe joint 600 and the second nozzle 300 are welded and fixed in position.

The terms first and second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to the listed steps or elements but may include steps or elements not expressly listed.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The above description is only illustrative of the preferred embodiments of the present utility model and the technical principles applied, and is not intended to limit the present utility model. Various modifications and variations of the present utility model will be apparent to those skilled in the art. The scope of the present utility model is not limited to the specific combination of the above technical features, but also includes other technical features formed by any combination of the above technical features or their equivalents without departing from the spirit of the present utility model. Such as the above-mentioned features and the technical features disclosed in the present utility model (but not limited to) having similar functions are replaced with each other.

Claims

1. A lancet, comprising:

the liquid suction device comprises a first nozzle (100), a liquid guide cavity (101) and a liquid suction needle hole (110) communicated with the liquid guide cavity (101) is formed in the needle tip of the first nozzle (100);

a second nozzle (300) provided with an infusion cavity (301) communicated with the liquid guide cavity (101), wherein the flow area of the infusion cavity (301) is larger than that of the liquid guide cavity (101);

the connecting assembly (200) comprises a connecting piece, and the connecting piece is respectively connected with the first nozzle (100) and the second nozzle (300) so as to be communicated with the liquid guide cavity (101) and the transfusion cavity (301).

2. The needle of claim 1, wherein the connector comprises:

the first connecting block (210) is respectively connected with the first nozzle (100) and the second nozzle (300), the first connecting block (210) is provided with a first connecting hole (211), and the first connecting hole (211) is respectively communicated with the liquid guide cavity (101) and the liquid transfusion cavity (301);

the second connecting block (220) is provided with a second connecting hole, the first connecting block (210) is arranged in the second connecting hole, and the first nozzle (100) and the second nozzle (300) respectively extend out from two ends of the second connecting hole.

3. The needle of claim 2, wherein the first connection hole (211) has a flow area that is larger than the flow area of the lumen (101) and smaller than the flow area of the lumen (301).

4. A puncture needle according to claim 3, characterized in that a first chamfer structure is provided at an end of the liquid guiding chamber (101) close to the first connecting hole (211), and the flow area of an end of the first chamfer structure close to the second nozzle (300) is larger than the flow area of an end far from the second nozzle (300); and/or the number of the groups of groups,

the end of the first connecting hole (211) close to the second nozzle (300) is provided with a second chamfer structure, and the flow area of the end of the second chamfer structure close to the first nozzle (100) is smaller than that of the end far away from the first nozzle (100).

5. A puncture needle according to claim 3, characterized in that the first end of the first connecting block (210) has a conical structure, the second end has a cylindrical structure, the end of the first nozzle (100) away from the liquid suction needle hole (110) is embedded into the conical structure, and the outer side wall of the first connecting block (210) is attached to the inner side wall of the second connecting hole.

6. The puncture needle according to claim 2, characterized in that a first positioning boss is provided on an outer side wall of the first connecting block (210), and the second nozzle (300) is abutted against the first positioning boss.

7. The puncture needle according to claim 1, characterized in that the second nozzle (300) is provided in an outer cylinder (420), one end of the connecting piece being embedded in the outer cylinder (420);

the connecting assembly (200) further comprises a needle fixing piece (230), a fixing hole is formed in the needle fixing piece (230), the connecting piece is arranged in the fixing hole, the first nozzle (100) and the second nozzle (300) respectively extend out of two ends of the fixing hole, and one end of the outer cylinder (420) is embedded into the fixing hole.

8. The needle of claim 7, wherein an end of the connector remote from the second nozzle (300) is formed with a conical structure through which the first nozzle (100) passes, and an outer sidewall of the connector is attached to an inner sidewall of the needle holder (230).

9. The needle of claim 7, further comprising a spacer assembly disposed between the outer barrel (420) and the second nozzle (300).

10. The puncture needle according to claim 7, characterized in that the connecting element is provided with a second positioning boss, with which the outer cylinder (420) abuts.

11. The puncture needle according to any of claims 1 to 10, characterized in that the liquid suction needle hole (110) is opened at the side wall of the first nozzle (100), and the liquid suction needle hole (110) is in smooth transition communication with the liquid guiding cavity (101).

12. The needle according to any one of claims 1 to 10, wherein the sidewall of the first nozzle (100) is provided with a venting groove (120).

13. The needle according to any one of claims 1 to 10, wherein the needle tip of the first nozzle (100) is prismatic in structure.

14. A coagulation analyzer comprising the puncture needle according to any one of claims 1 to 13.