A fingertip blood sampling device

Abstract

The present invention relates to the technical field of medical devices, and discloses a fingertip blood collection device, including: a hollow outer shell, which is provided with a trigger window and a clamping part; a needle disc, on which a blood collection needle and a blood collection channel are provided; a limit rebound retaining ring, arranged between the needle disc and the outer shell; a needle disc clamp, which is arranged inside the outer shell and can be adaptively clamped with the needle disc; an elastic member, arranged between the needle disc and the needle disc clamp; when the needle disc is adaptively clamped with the needle disc clamp, the elastic member is in a compressed state, and the blood collection needle is located in the inner cavity of the outer shell; when the trigger button drives the needle disc to disengage from the needle disc clamp, the elastic member is in a stretched state, and the blood collection needle extends into the clamping part. In the present invention, the fingertip blood collection device integrates needle extraction and blood collection, avoids contamination of blood samples, improves the detection accuracy, and has low requirements for the cooperation of patients.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a fingertip blood collection device. Background Art

[0002] At present, the fingertip blood collection needles widely used in medical institutions are disposable simple blood collection needles. During operation, the operator holds the inner side of the patient's fingertip at the blood collection site with the left index finger and thumb. After disinfecting the blood collection site to make it congested, the operator holds the blood collection needle with the right hand, removes the safety bolt of the blood collection needle, places it on the disinfected blood collection site, and presses the inner sleeve in direct contact with the patient's skin, so that the needle core is launched and inserted. After the needle comes out, a small amount of blood will ooze out from the needle hole. Then, the operator squeezes the blood collection site with the left hand to collect enough blood into the blood collection tube to complete the blood collection process.

[0003] First of all, traditional fingertip blood collection needles have high requirements for patient cooperation, and the steps are scattered. The operator needs to cooperate with both hands to implement the entire operation steps. At the same time, during the blood collection process, the operator's hand needs to be fixed to squeeze the fingertip, with a high frequency of contact with the blood collection site, posing a risk of contaminating the blood sample. In addition, traditional blood collection methods cannot perform self-sampling and cannot provide a more convenient sampling method for people in need. Some types of blood collection needles also have the problem of exposed needle tips after use, which may cause accidental injury to medical staff.

[0004] Therefore, it is necessary to design a device that integrates needle insertion and blood collection to solve the problems of scattered steps, high risk of contaminating blood samples, and inability to perform self-sampling of traditional fingertip blood collection needles. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a fingertip blood collection device that integrates needle insertion and blood collection, avoids contamination of blood samples, improves the detection accuracy, and has low requirements for patient cooperation.

[0006] The technical solution provided by the present invention is as follows:

[0007] A fingertip blood collection device, comprising:

[0008] A hollow outer shell, provided with a trigger window and a clamping part on the outer shell. A trigger button is arranged in the trigger window. The clamping part is located at one end of the outer shell and is communicated with the inner cavity of the outer shell;

[0009] A needle disk, provided with a blood collection needle and a blood collection channel on the needle disk. The blood collection needle is arranged at one end of the needle disk. The needle disk is arranged inside the outer shell, so that the blood collection needle is located at one end close to the clamping part. The blood collection channel is used for collecting blood;

[0010] A limit rebound retaining ring, arranged between the needle disk and the outer shell, for separating the blood collection needle from the blood collection site;

[0011] A needle plate clamp, which is arranged inside the housing and can be adaptively clamped with the needle plate;

[0012] An elastic member, which is arranged between the needle plate and the needle plate clamp;

[0013] When the needle plate is adaptively clamped with the needle plate clamp, the elastic member is in a compressed state, and the blood collection needle is located in the inner cavity of the housing;

[0014] When the trigger button drives the needle plate to disengage from the needle plate clamp, the elastic member is in an extended state, and the blood collection needle extends into the clamping portion.

[0015] Further preferably, the needle plate includes a fixed portion, a trigger platform and a spring positioning rod connected in sequence. The blood collection needle is arranged at one end of the fixed portion away from the trigger platform. A blood collection port is arranged inside the fixed portion. The blood collection channel penetrates through the trigger platform and the spring positioning rod and is communicated with the blood collection port;

[0016] A boss is arranged on the trigger platform, and the boss is used for adaptively clamping with the needle plate clamp;

[0017] Symmetrically longitudinally planed positioning planes are arranged on the trigger platform, and the positioning planes are used for locking the relative positions of the needle plate and the needle plate clamp to prevent the needle plate from rotating.

[0018] The elastic member is sleeved on the spring positioning rod, and one end of it abuts against the trigger platform.

[0019] Further preferably, the fixed portion, the trigger platform and the spring positioning rod are all of cylindrical structures and are integrally formed. The diameter of the fixed portion is greater than the diameter of the trigger platform which is greater than the diameter of the spring positioning rod;

[0020] A plurality of blood collection needles are arranged, and the plurality of blood collection needles are spaced apart at one end of the fixed portion away from the trigger platform;

[0021] Two bosses are arranged, and the two bosses are symmetrically arranged on both sides of the trigger platform;

[0022] There are two positioning planes, which are symmetrically arranged on both sides of the trigger platform and have the same axial position as the boss.

[0023] Further preferably, the needle plate further includes a stop strip, the stop strip is arranged on the side of the boss close to the blood collection needle, and the limit rebound retaining ring is sleeved on the fixed portion and is located between the stop strip and the top wall of the housing.

[0024] Further preferably, the limit rebound retaining ring includes a retaining ring body and a plurality of elastic strips. The retaining ring body is of a circular ring structure, and the plurality of elastic strips are arranged at intervals along the circular ring structure of the retaining ring body, and the plurality of elastic strips are respectively inclined with respect to the retaining ring body.

[0025] Further preferably, the needle plate is provided with a rear end cover, a spring positioning groove, a clamping angle arm and a clamping angle that are connected in sequence. The rear end cover is adaptively connected to the outer shell. The spring positioning groove, the clamping angle arm and the clamping angle are arranged inside the outer shell, so that one end of the elastic member away from the trigger platform abuts against the spring positioning groove. The clamping angle is located at the end of the clamping angle arm and extends to one side thereof for adaptively clamping with the boss.

[0026] Further preferably, there are two clamping angle arms and two clamping angles respectively, and the two groups of clamping angle arms and clamping angles are symmetrically arranged;

[0027] The spring positioning rod penetrates through the needle plate and extends to the outside of the outer shell.

[0028] Further preferably, the trigger button is provided with a clamping portion and two chamfers arranged oppositely. The trigger button is installed in the trigger window, so that the clamping portion abuts against the inner wall of the outer shell;

[0029] The trigger button is perpendicular to the clamping angle arm, and the chamfers extend to the inner sides of the two clamping angle arms;

[0030] When the trigger button is pressed, the two chamfers respectively gradually expand the corresponding clamping angle arms, so that the clamping angle is disengaged from the corresponding boss;

[0031] When the trigger button is released, pulling the needle plate can make the clamping angle be adaptively clamped with the boss.

[0032] Further preferably, the clamping portion includes two finger pressing plates arranged oppositely, and an accommodating cavity for placing the finger tip is formed between the two finger pressing plates.

[0033] Further preferably, it further includes:

[0034] A blood collection bottle, which is connected to one end of the needle plate away from the blood collection needle, and the blood collection bottle is communicated with the blood collection channel for collecting blood.

[0035] Compared with the prior art, the beneficial effects of the finger tip blood collection device of the present invention are as follows:

[0036] In the present invention, the fingertip blood collection device integrates needle puncture and blood collection, simplifies the blood collection process, liberates both hands, and can be completed in only three steps; the blood collection process is completely completed through a sterile device, the blood sample is relatively free of contamination, and detection errors are avoided; the requirement for patient cooperation is relatively low. Even for children, the operation is relatively simple and the process is relatively easy; after the needle puncture, it rebounds, and there are bilateral clamping parts to prevent the needle tip from being exposed, effectively preventing accidental stabbing of medical staff; it provides a more convenient and fast blood collection method for people. Patients can independently complete blood collection at home or in the hospital and hand it over to the medical staff window for monitoring, saving time and improving efficiency; the structure of the present invention is reasonably designed, has good stability, small vibration, high movement precision, is safe and efficient, easy to operate, has a wide range of uses, brings convenience to medical work, and reduces the pain of patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The preferred embodiments will be further described below in a clear and understandable manner in conjunction with the drawings to further illustrate the above characteristics, technical features, advantages and their implementation manners.

[0038] Figure 1 It is a schematic structural diagram of a fingertip blood collection device according to a specific embodiment of the present invention;

[0039] Figure 2 It is a schematic structural diagram of a fingertip blood collection device from another perspective according to a specific embodiment of the present invention;

[0040] Figure 3 It is a cross-sectional view of a fingertip blood collection device according to a specific embodiment of the present invention;

[0041] Figure 4 It is a schematic structural diagram of a needle disc according to another specific embodiment of the present invention;

[0042] Figure 5 It is a partial cross-sectional view of a needle disc according to another specific embodiment of the present invention;

[0043] Figure 6 It is a schematic structural diagram of a needle disc from another perspective according to another specific embodiment of the present invention;

[0044] Figure 7 It is a schematic structural diagram of a needle disc clamp according to another specific embodiment of the present invention;

[0045] Figure 8 It is a schematic structural diagram of a needle disc clamp from another perspective according to another specific embodiment of the present invention;

[0046] Figure 9 It is a schematic structural diagram of a limit rebound retaining ring according to another specific embodiment of the present invention;

[0047] Figure 10 It is a schematic structural diagram of a housing according to another specific embodiment of the present invention;

[0048] Figure 11 is a schematic structural diagram of a trigger button according to another specific embodiment of the present invention;

[0049] Figure 12 is a schematic structural diagram of another perspective of the trigger button according to another specific embodiment of the present invention;

[0050] Figure 13 is a schematic structural diagram of the use state of a fingertip blood collection device according to another specific embodiment of the present invention;

[0051] Figure 14 is a schematic structural diagram of another perspective of the use state of a fingertip blood collection device according to another specific embodiment of the present invention;

[0052] Figure 15 is a cross-sectional view of the use state of a fingertip blood collection device according to another specific embodiment of the present invention.

[0053] Explanation of the reference numerals in the drawings:

[0054] 1. Needle disc, 101. Spring positioning rod, 102. Trigger platform, 103. Boss, 104. Blood collection needle, 105. Blood collection port, 106. Blood collection channel, 107. Fixing part, 108. Stop bar, 109. Positioning plane, 2. Needle disc clamp, 201. Clamping angle, 202. Clamping angle arm, 203. Spring positioning groove, 204. Rear end cover, 3. Elastic member, 4. Limit rebound retaining ring, 401. Retaining ring body, 402. Elastic strip, 5. Outer shell, 501. Finger pressing plate, 502. Trigger window, 6. Trigger button, 601. Clamping part, 602. Chamfer, 7. Blood collection bottle, 8. Finger tip. Specific embodiments

[0055] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0056] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, wholes, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or collections.

[0057] For the sake of simplicity of the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, for the sake of simplicity and easy understanding of the drawings, for components with the same structure or function in some figures, only one of them is schematically shown, or only one of them is labeled. In this article, "one" not only means "only this one", but also means "more than one" situation.

[0058] It should also be further understood that the term "and / or" used in the description of the present application and the appended claims refers to any combination and all possible combinations of one or more of the related listed items, and includes these combinations.

[0059] In the embodiments shown in the drawings, the indication of directions (such as up, down, left, right, front and back) is used to explain that the structures and movements of various components of the present invention are not absolute but relative. When these components are in the positions shown in the drawings, these descriptions are appropriate. If the descriptions of the positions of these components change, then the indication of these directions also changes accordingly.

[0060] In addition, in the description of the present application, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0061] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will describe the specific embodiments of the present invention with reference to the drawings. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings, and other embodiments can also be obtained.

[0062] As a specific embodiment, such as Figures 1 to 15As shown, this embodiment provides a fingertip blood collection device comprising: a housing 5, a needle tray 1, a position-limiting rebound retainer 4, a needle tray clamp 2, and an elastic member 3. The housing 5 is hollow and is provided with a trigger window 502 and a clamping portion. A trigger button 6 is located within the trigger window 502. The clamping portion is located at one end of the housing 5 and communicates with the inner cavity of the housing 5. The needle tray 1 is provided with a blood collection needle 104 and a blood collection channel 106. The blood collection needle 104 is disposed at one end of the needle tray 1. The needle tray 1 is positioned within the housing 5, with the blood collection needle 104 positioned near the clamping portion. The blood collection channel 106 is used to collect blood. The position-limiting rebound retainer 4 is disposed between the needle tray 1 and the housing 5 to prevent the blood collection needle 104 from being removed from the blood collection site. The needle tray clamp 2 is disposed within the housing 5 and is adapted to engage with the needle tray 1. The elastic member 3 is disposed between the needle tray 1 and the needle tray clamp 2. When the needle disk 1 and the needle disk clamp 2 are adapted to be engaged, the elastic member 3 is in a compressed state, and the blood collection needle 104 is located in the inner cavity of the shell 5; when the trigger button 6 drives the needle disk 1 and the needle disk clamp 2 to disengage, the elastic member 3 is in an extended state, and the blood collection needle 104 extends into the clamping portion.

[0063] Specifically, if Figures 4 to 6 As shown, the needle tray 1 includes a fixed portion 107, a trigger platform 102, and a spring-loaded positioning rod 101, which are connected in sequence. A lancet 104 is positioned at the end of the fixed portion 107 away from the trigger platform 102. A blood collection port 105 is provided within the fixed portion 107. A blood collection channel 106 extends through the trigger platform 102 and the spring-loaded positioning rod 101 and communicates with the blood collection port 105. The lancet 104 can be a steel needle. Multiple lancets 104 are provided, spaced apart at the end of the fixed portion 107 away from the trigger platform 102. The thickness of fingertip skin varies from person to person. Traditional distal lancets have a single needle core, resulting in varying penetration depths, which affects bleeding quality and blood collection efficiency. By providing multiple lancets 104 and attaching them to the fixed portion 107 with adjustable depth, for example, by threading the lancet 104 into the fixed portion 107, the depth of the lancet 104 can be adjusted by twisting the lancet 104. It can improve bleeding effect and blood collection efficiency, and is suitable for blood collection from special populations.

[0064] The trigger platform 102 is provided with bosses 103 and positioning planes 109. The bosses 103 are used for mating and clamping with the clamping corners 201 on the needle disk clamp 2, and the positioning planes 109 are used for locking the relative positions of the needle disk 1 and the needle disk clamp 2 to prevent the needle disk 1 from rotating. There are two bosses 103 and two positioning planes 109, which are symmetrically arranged on both sides of the trigger platform 102. The fixing part 107, the trigger platform 102 and the spring positioning rod 101 are all of cylindrical structure and integrally formed. The diameter of the fixing part 107 is greater than the diameter of the trigger platform 102 which is greater than the diameter of the spring positioning rod 101. The elastic member 3 can be a spring, and the elastic member 3 is sleeved on the spring positioning rod 101 in a matching manner, with one end thereof abutting against the trigger platform 102. The needle disk 1 is further provided with a retaining bar 108, and the retaining bar 108 is arranged on the side of the boss 103 close to the blood collection needle 104. The limiting and rebounding retaining ring 4 is sleeved on the fixing part 107 and is located between the retaining bar 108 and the top wall of the housing 5.

[0065] As Figure 9 shown, the limiting and rebounding retaining ring 4 includes a retaining ring body 401 and a plurality of elastic strips 402. The retaining ring body 401 is of a circular ring structure, and the plurality of elastic strips 402 are arranged at intervals along the circular ring structure of the retaining ring body 401, and the plurality of elastic strips 402 are respectively arranged at an acute angle with the retaining ring body 401.

[0066] In this embodiment, the needle disk 1 can be detachably installed in the housing 5 as a disposable item, making the blood collection needle 104 safe and hygienic during use and avoiding the user's wound from being infected; the blood collection needle 104 can instantaneously pierce into the user's body by the elastic force of the elastic member 3, and then instantaneously pop out of the user's body under the action of the rebounding force of the limiting and rebounding retaining ring 4, so as to ensure that the user can reduce the pain during blood collection and help the user complete the blood collection process in a relatively short time.

[0067] As Figure 7 、 Figure 8 shown, the needle disk clamp 2 is provided with a rear end cover 204, a spring positioning groove 203, a clamping corner arm 202 and a clamping corner 201 which are connected in sequence. The rear end cover 204 is detachably connected to the housing 5 in a matching manner. The spring positioning groove 203, the clamping corner arm 202 and the clamping corner 201 are arranged inside the housing 5, so that one end of the elastic member 3 away from the trigger platform 102 abuts against the spring positioning groove 203. The clamping corner 201 is located at the end of the clamping corner arm 202 and extends towards one side thereof for mating and clamping with the boss 103. There are two clamping corner arms 202 and two clamping corners 201 respectively, and the two groups of clamping corner arms 202 and clamping corners 201 are symmetrically arranged. The spring positioning rod 101 passes through the needle disk clamp 2 and extends to the outside of the housing 5.

[0068] As Figure 11 、 Figure 12As shown, the trigger button 6 is provided with a latching portion 601 and two oppositely positioned chamfers 602. The trigger button 6 is mounted within the trigger window 502, with the latching portion 601 resting against the inner wall of the housing 5. The trigger button 6 is perpendicular to the latching arms 202, and the chamfers 602 extend to the inner sides of the two latching arms 202. When the trigger button 6 is pressed, the two chamfers 602 gradually push apart the corresponding latching arms 202, causing the latching angle 201 to disengage from the corresponding boss 103. At this point, the needle disk 1 is instantly ejected under the elastic force of the elastic member 3, allowing the lancet 104 to instantly penetrate the user's body. Subsequently, the needle disk 1 is instantly ejected from the user's body under the rebound force of the limit rebound ring 4. The end of the latching angle 201 facing away from the rear end cap 204 is an inclined surface. When the trigger button 6 is released, pulling the needle disk 1 causes the latching angle 201 to engage with the boss 103.

[0069] like Figure 10 As shown, the clamping portion includes two opposing finger pressure plates 501. A cavity is formed between the two finger pressure plates 501 to accommodate the fingertip 8. The cavity is shaped to fit the fingertip 8. The finger pressure plates 501 have outwardly extending edges. During use, the fingertip 8 is placed within the cavity. Pressing the edges shrinks the cavity, allowing the finger pressure plates 501 to apply pressure around the blood collection site, dissipating pain and increasing the speed of blood collection.

[0070] like Figures 13 to 15 As shown, the fingertip blood collection device further includes: a blood collection bottle 7, which is connected to the end of the needle tray 1 away from the blood collection needle 104, and the blood collection bottle 7 is connected to the blood collection channel 106 for collecting blood.

[0071] The blood collection process using the fingertip blood collection device in this embodiment is as follows:

[0072] Insert the fingertip 8 between the two finger pressure plates 501, insert the trigger button 6 from the trigger window 502, and continue to insert after contacting the clamping angle arm 202 until the two clamping angles 201 are stretched open, releasing the elastic force of the elastic member 3, so that the blood collection needle 104 on the needle plate 1 is inserted into the blood collection site of the fingertip 8, and rebounds with the help of the limiting rebound retaining ring 4, so that the blood collection needle 104 is separated from the blood collection site; repeatedly close the finger pressure plate 501 to squeeze the fingertip, so that the blood beads flow out into the blood collection port 105, pass through the blood collection channel 106, and finally flow into the blood collection bottle 7. After collecting a sufficient amount of blood sample, unplug the blood collection bottle 7 and tighten the bottle cap to complete the blood collection.

[0073] The finger-pricking blood collection device of this embodiment integrates needle puncture and blood collection, simplifies the blood collection process, liberates both hands, and can be completed in only three steps; the blood collection process is completely completed through a sterile device, the blood sample is relatively free of pollution, and detection errors are avoided; the requirement for patient cooperation is relatively low. Even for children, the operation is relatively simple and the process is relatively easy; after the needle is punctured, it rebounds, and there are bilateral clamping parts so that the needle tip will not be exposed, effectively preventing medical staff from being accidentally stabbed; it provides a more convenient and fast blood collection method for people. Patients can independently complete blood collection at home or in the hospital and hand it over to the medical staff window for monitoring, saving time and improving efficiency; the structural design of the present invention is reasonable, has good stability, small vibration, high motion accuracy, is safe and efficient, easy to operate, has a wide range of uses, brings convenience to medical work, and reduces the pain of patients.

[0074] In the above embodiments, the descriptions of each embodiment have their own emphases. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0075] It should be noted that the above embodiments can be freely combined according to needs. The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A fingertip blood sampling device, characterized in that, Comprising: A hollow outer shell, on which a trigger window and a clamping part are provided. A trigger button is arranged in the trigger window. The clamping part is located at one end of the outer shell and communicates with the inner cavity of the outer shell. The clamping part includes two oppositely arranged finger pressing plates, and an accommodation cavity for placing the finger tip is formed between the two finger pressing plates; A needle disc, on which a blood collection needle and a blood collection channel are provided. The blood collection needle is arranged at one end of the needle disc. The needle disc is arranged inside the outer shell, so that the blood collection needle is located at one end close to the clamping part. The blood collection channel is used for collecting blood; A limit rebound retaining ring, arranged between the needle disc and the outer shell, for separating the blood collection needle from the blood collection site; A needle disc clamp, arranged inside the outer shell and capable of being adaptively clamped with the needle disc; An elastic member, arranged between the needle disc and the needle disc clamp; When the needle disc is adaptively clamped with the needle disc clamp, the elastic member is in a compressed state, and the blood collection needle is located in the inner cavity of the outer shell; When the trigger button drives the needle disc to disengage from the needle disc clamp, the elastic member is in an extended state, and the blood collection needle extends into the clamping part; The needle disc includes a fixed part, a trigger platform and a spring positioning rod connected in sequence. The blood collection needle is arranged at one end of the fixed part away from the trigger platform. A blood collection port is arranged inside the fixed part. The blood collection channel penetrates through the trigger platform and the spring positioning rod and communicates with the blood collection port; A boss is arranged on the trigger platform, and the boss is used for adaptively clamping with the needle disc clamp; Symmetrically longitudinally planed positioning planes are arranged on the trigger platform, and the positioning planes are used for locking the relative positions of the needle disc and the needle disc clamp to prevent the needle disc from rotating; The elastic member is sleeved on the spring positioning rod, and one end of it abuts against the trigger platform; The needle disc clamp is provided with a rear end cover, a spring positioning groove, a clamping angle arm and a clamping angle connected in sequence. The rear end cover is adaptively connected with the outer shell. The spring positioning groove, the clamping angle arm and the clamping angle are arranged inside the outer shell, so that one end of the elastic member away from the trigger platform abuts against the spring positioning groove. The clamping angle is located at the end of the clamping angle arm and extends to one side of it, for adaptively clamping with the boss.

2. The finger tip blood collection device according to claim 1, wherein: The fixed part, the trigger platform and the spring positioning rod are all of cylindrical structures and are integrally formed. The diameter of the fixed part is greater than the diameter of the trigger platform which is greater than the diameter of the spring positioning rod; A plurality of blood collection needles are provided, and the plurality of blood collection needles are arranged at intervals at one end of the fixed part away from the trigger platform; Two bosses are arranged, and the two bosses are symmetrically arranged on both sides of the trigger platform; There are two positioning planes, symmetrically arranged on both sides of the trigger platform and having the same axial position as the boss.

3. The finger tip blood collection device according to claim 1 or 2, wherein: The needle plate further includes a stop bar, the stop bar is arranged on a side of the boss close to the blood collection needle, the limiting and rebounding retaining ring is sleeved on the fixing portion and is located between the stop bar and the top wall of the housing.

4. The fingertip blood collection device according to claim 3, wherein: The limiting and rebounding retaining ring includes a retaining ring body and a plurality of elastic strips. The retaining ring body is of a circular ring structure, and the plurality of elastic strips are arranged at intervals along the circular ring structure of the retaining ring body, and the plurality of elastic strips are respectively inclined with respect to the retaining ring body.

5. The fingertip blood collection device according to claim 1, wherein: There are two card angle arms and two card angles respectively, and the two groups of card angle arms and card angles are symmetrically arranged; The spring positioning rod penetrates through the needle plate and extends to the outside of the housing.

6. The fingertip blood collection device according to claim 5, wherein: The trigger button is provided with a clamping portion and two chamfers arranged oppositely, and the trigger button is installed in the trigger window so that the clamping portion abuts against the inner wall of the housing; The trigger button is perpendicular to the card angle arm, and the chamfers extend to the inner sides of the two card angle arms; When the trigger button is pressed, the two chamfers gradually spread open the corresponding card angle arms respectively, so that the card angles are disengaged from the corresponding bosses; When the trigger button is released, pulling the needle plate can make the card angles and the bosses fit and engage.

7. The fingertip blood sampling device according to claim 1, wherein, It further includes: A blood collection bottle, the blood collection bottle is connected to an end of the needle plate away from the blood collection needle, and the blood collection bottle is communicated with the blood collection channel for collecting blood.

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