Post-percussion blood taking needle

Abstract

The utility model discloses a rear percussion blood taking needle, including shell, needle body, drive spring, retraction spring and press cap, the press cap is installed at the rear end of shell and can slide along the puncture direction of needle body, needle body includes needling portion, also including connecting post, connecting post is provided in the shell, needle body is accommodated in connecting post, and the connecting post is connected with the drive spring. The connecting column comprises a sliding connecting rod and a protective cap which is connected with the sliding connecting rod in a twisting-off mode, the front end of the protective cap penetrates out of the front end of the shell, and after the protective cap is twisted off, the needling part protrudes out of the sliding connecting rod. According to the utility model, parts are few, the structural design is reasonable, and automatic assembly is facilitated; the needle body of the blood taking needle can immediately return after being triggered and punctured into the skin, the needle body cannot be triggered again, and cross infection caused by secondary use or scratching of people is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of blood collection needles, and particularly relates to a post-triggered blood collection needle. Background Art

[0002] When collecting blood from patients, generally two methods are adopted: venous blood collection and finger blood collection. Finger blood collection is more convenient and fast, with low operation difficulty and less blood extraction volume, which is more suitable for some blood test items and patients. The existing finger blood collection method generally uses a blood collection needle to puncture the fingertip of the patient, and then samples the blood through a sampling capillary. The earliest blood collection needle used is a needle head structure with a simple fixed head. When using this kind of blood collection needle, the depth of puncture and the speed of insertion and extraction depend on the experience of medical staff. It is often very difficult to achieve just the right amount to make the wound smaller and be able to collect enough blood, bringing greater pain to the patient.

[0003] To solve the above problems, an automatic blood collection needle connected with an ejection device appears. This type of blood collection needle generally includes a housing, a needle body and an ejection device. After the ejection device is connected to the needle body, it is assembled in the housing to form an integral structure. This kind of blood collection needle head controls the needle body to quickly penetrate into the human body to a certain depth and then quickly withdraw from the human body through the ejection device, thus reducing the pain of the patient.

[0004] For example, the disposable adjustable puncture depth blood collection needle disclosed in the Chinese utility model patent (publication number: CN219516294U) includes a syringe barrel, a blood collection needle body, a spring mechanism and a depth adjuster; one end of the syringe barrel is open and the other end is closed; the blood collection needle body and the spring mechanism are arranged in the syringe barrel, one end of the blood collection needle body is fixedly connected to the spring mechanism, and the spring mechanism is used to eject the blood collection needle body outwards. A shift lever is connected to the spring mechanism, and the shift lever passes through the side wall of the syringe barrel and can slide along the length direction of the syringe barrel. The shift lever is used to adjust the ejection force of the spring mechanism. A plurality of limit grooves for restricting the sliding stroke of the shift lever are arranged on the side wall of the syringe barrel; the depth adjuster is threadedly connected to the open end of the syringe barrel, and the depth adjuster is used to adjust the penetration length of the blood collection needle body. The blood collection needle also includes a protective cover, and the protective cover is sleeved on the open end of the syringe barrel and covers the depth adjuster. This blood collection needle can puncture and collect blood with appropriate force and needle insertion depth according to different patient groups, reducing the pain of the patient.

[0005] However, the disposable adjustable puncture depth blood collection needle disclosed in the above-mentioned prior art has the following disadvantages: (1) The blood collection needle body is always exposed to the air, which can easily cause the blood collection needle body to be contaminated; (2) The blood collection needle body can be repeatedly fired, and the blood collection needle can be fired again by sliding the toggle block. This structural design may cause the risk of repeated use of the blood collection needle due to the negligence of the operator, thereby causing cross infection; (3) The blood collection needle needs to be covered with a protective cover before it can be discarded. During this operation, the operator may accidentally pierce the operator's hand due to his own carelessness or being pushed by other external forces, thereby increasing the risk of infection, and the safety performance is poor.

[0006] To further address the aforementioned technical issues, blood collection needles have emerged on the market that have a needle body that is isolated before use and can be retracted after use. For example, a push-type blood collection needle disclosed in Chinese Utility Model Patent (Publication No.: CN219982887U) comprises a housing, a screw cap, a rear cover, and a needle body. The screw cap is disposed at the front end of the housing and axially positioned relative to the housing. A positioning structure is formed between the screw cap and the housing to prevent rotation of the screw cap. The rear cover is mounted at the rear end of the housing. The needle body is accommodated in a cavity within the housing. A front spring is provided between the needle body and the screw cap, and a rear spring is provided between the needle body and the rear cover. Although this type of needle can address the aforementioned technical issues, its structure is relatively complex and includes numerous components, making production and assembly cumbersome, making automated assembly difficult, and resulting in high production costs.

[0007] Therefore it is necessary to improve the existing technology. Utility Model Content

[0008] The purpose of the present invention is to provide a post-fire blood collection needle in response to the defects and shortcomings of the existing technology. The present invention has fewer parts and a simple structure, is convenient for automatic assembly, and has a low production cost.

[0009] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0010] A rear-firing blood collection needle, comprising a housing, a needle body, a driving spring, a retracting spring and a pressing cap. The pressing cap is installed at the rear end of the housing and can slide along the puncturing direction of the needle body. The needle body includes a puncturing portion and also includes a connecting column. The connecting column is arranged inside the housing, and the needle body is accommodated in the connecting column. The connecting column includes a sliding rod and a protective cap that is breakably connected to the sliding rod. The front end of the protective cap protrudes from the front end of the housing. After the protective cap is broken off, the puncturing portion protrudes from the sliding rod. The driving spring is abutted between the pressing cap and the rear end of the sliding rod, and the retracting spring is abutted between the front end of the housing and the front end of the sliding rod. On both sides of the rear end of the sliding rod, breakable lugs are provided. Inside the housing, a first sliding groove that is slidably engaged with the lugs is provided. At the front end of the first sliding groove, a stop step that is in stop cooperation with the lugs is formed. The stop step and the lugs are in stop cooperation to limit the sliding rod in the initial position. By pressing the pressing cap, the lugs are broken, so as to release the axial restriction of the stop step on the sliding rod, enabling the needle body to be fired along the puncturing direction under the elastic force of the driving spring. After being fired, the needle body retracts into the housing under the transmission of the elastic force of the retracting spring.

[0011] Further, a through hole for the protective cap to pass through is provided at the front end of the housing. On the outer wall of the protective cap, a convex block that is in stop cooperation with the through hole is provided to limit the forward movement of the protective cap relative to the housing. By twisting the protective cap, the convex block can be disengaged from the stop cooperation with the through hole, so that the protective cap can move forward out of the housing.

[0012] Further, a concave ring portion is provided at the connection between the sliding rod and the protective cap.

[0013] Further, a socket portion for sleeving and cooperating with the driving spring is provided at the rear end of the sliding rod.

[0014] Further, a frustum portion is provided at the front end of the sliding rod.

[0015] Further, the through hole is a square hole, and the cross section of the convex block is square.

[0016] Further, a convex platform for sleeving with the driving spring is provided at the center of the pressing cap.

[0017] Further, protrusions extending outward are provided on both sides of the pressing cap. Inside the housing, a second sliding groove that is slidably engaged with the protrusions is provided. At the rear end of the second sliding groove, a stop block that is in stop cooperation with the protrusions is provided.

[0018] Further, the cross sections of both the housing and the pressing cap are elliptical.

[0019] Further, both the driving spring and the retracting spring are return springs.

[0020] After adopting the above structure, the beneficial effects of the utility model are as follows:

[0021] (1) A rear-firing blood collection needle of the present utility model includes a housing, a needle body, a driving spring, a retracting spring and a pressing cap. The pressing cap is installed at the rear end of the housing and can slide along the puncturing direction of the needle body. The needle body includes a puncturing portion and a connecting column. The connecting column is arranged inside the housing, and the needle body is accommodated in the connecting column. The utility model has fewer components and a reasonable structural design, which is conducive to realizing automatic assembly. After the needle body of the blood collection needle is fired and pricks into the skin, it can immediately retract the needle, and the needle body cannot be fired again, avoiding secondary use or scratching people and causing cross-infection.

[0022] (2) A rear-firing blood collection needle of the present utility model, the connecting column is arranged inside the housing. The connecting column includes a sliding rod and a protective cap that can be brokenly connected to the sliding rod. The front end of the protective cap protrudes from the front end of the housing. When the protective cap is broken, the puncturing portion protrudes from the sliding rod. Before use, the needle body is always accommodated inside the connecting column, avoiding contamination caused by the needle body being exposed to the air. During use, break the protective cap and remove the protective cap along the puncturing direction of the needle body. At this time, the puncturing portion of the needle body protrudes from the sliding rod, and the user can press the pressing cap to eject the needle for use. The operation is convenient and suitable for different users.

[0023] (3) A rear-firing blood collection needle of the present utility model, the driving spring is abutted between the pressing cap and the rear end of the sliding rod, and the retracting spring is abutted between the front end of the housing and the front end of the sliding rod. The driving spring is an energy storage mechanism, which is ingeniously combined with the connecting column and the needle body. After the driving spring is compressed, it stores energy. When the lug is broken, the driving spring releases the stored energy to realize the firing of the needle body, making the needle body eject the needle stably and applicable to users with different forces. After blood collection, under the elastic force of the retracting spring, the needle body will quickly retract, reducing the time the needle body stays inside the patient's finger and reducing the patient's pain.

[0024] (4) A rear-firing blood collection needle of the present utility model, both sides of the rear end of the sliding rod are provided with breakable lugs, and the inner side of the housing is provided with a first chute that is slidably matched with the lugs; both sides of the pressing cap are provided with outwardly extending protrusions, and the inner side of the housing is provided with a second chute that is slidably matched with the protrusions. Through the cooperation of the lugs and the first chute and the cooperation of the protrusions and the second chute, the firing direction of the sliding rod is limited, improving the stability of the needle body firing and reducing the pain caused by the needle body shaking to the patient. Description of the Drawings

[0025] In order to more clearly illustrate the specific embodiments of the present utility model, the following will briefly introduce the drawings required for use in the description of the specific embodiments. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0027] Figure 2 is an exploded view of the overall structure of the present utility model;

[0028] Figure 3 is a cross-sectional view of the overall structure of the present utility model;

[0029] Figure 4 is a schematic diagram of the overall structure of the present utility model (removing the protective cap);

[0030] Figure 5 is a cross-sectional view of the overall structure of the present utility model (removing the protective cap);

[0031] Figure 6 is a three-dimensional schematic diagram of the outer shell of the present utility model;

[0032] Figure 7 is a three-dimensional schematic diagram of the connecting column of the present utility model;

[0033] Figure 8 is a schematic diagram of the mating connection of the sliding rod and the needle body of the present utility model;

[0034] Figure 9 is a three-dimensional schematic diagram of the pressing cap of the present utility model.

[0035] Figures 1 to 9 The reference numerals in [] are:

[0036] 1. Outer shell; 11. First chute; 111. Stopping step; 12. Through hole; 13. Second chute; 131. Stopping block; 2. Needle body; 21. Needling part; 3. Driving spring; 4. Retracting spring; 5. Pressing cap; 51. Boss; 52. Protrusion; 6. Connecting column; 61. Sliding rod; 611. Lug; 612. Socket part; 613. Frustum part; 62. Protective cap; 621. Protruding block; 63. Concave ring part. Specific embodiments

[0037] To make the above objects, features, and advantages of the present utility model more apparent and understandable, the following provides a detailed description of the specific embodiments of the present utility model in conjunction with the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0038] In the description of the present utility model, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0039] In addition, if terms such as "first" and "second" appear, these terms are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0040] In the present utility model, unless otherwise clearly specified and limited, if terms such as "installation", "connection", "coupling", "fixation", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0041] In the present utility model, unless otherwise clearly specified and defined, when a first feature is described as being "on" or "under" a second feature or the like, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0042] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the present utility model are only for the purpose of illustration and do not represent the only implementation manner.

[0043] It should be noted that, without conflict, the embodiments and features in the embodiments of the present utility model can be combined with each other. The present utility model will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0044] As Figures 1 to 9As shown in the figure, a rear-firing blood collection needle includes a housing 1, a needle body 2, a driving spring 3, a retracting spring 4, and a pressing cap 5. The pressing cap 5 is installed at the rear end of the housing 1 and can slide along the puncturing direction of the needle body 2. The needle body 2 includes a puncturing portion 21 and a connecting column 6. The connecting column 6 is disposed inside the housing 1, and the needle body 2 is accommodated within the connecting column 6. The connecting column 6 includes a sliding rod 61 and a protective cap 62 that is breakably connected to the sliding rod 61. The front end of the protective cap 62 protrudes from the front end of the housing 1. After the protective cap 62 is broken off, the puncturing portion 21 protrudes from the sliding rod 61. The driving spring 3 is disposed between the pressing cap 5 and the rear end of the sliding rod 61, and the retracting spring 4 is disposed between the front end of the housing 1 and the front end of the sliding rod 61. On both sides of the rear end of the sliding rod 61, there are breakable lugs 611 provided. Inside the housing 1, there is a first chute 11 that is slidably engaged with the lugs 611. At the front end of the first chute 11, there is a stop step 111 that is in a stop fit with the lugs 611. The stop step 111 and the lugs 611 are in a stop fit to limit the sliding rod 61 in the initial position. By pressing the pressing cap 5, the lugs 611 are broken off to release the axial restriction of the stop step 111 on the sliding rod 61, so that the needle body 2 is fired along the puncturing direction under the elastic force of the driving spring 3. After firing, the needle body 2 retracts into the housing 1 under the transmission of the elastic force of the retracting spring 4. Both the driving spring 3 and the retracting spring 4 are return springs. On both sides of the pressing cap 5, there are outwardly extending protrusions 52 provided. Inside the housing 1, there is a second chute 13 that is slidably engaged with the protrusions 52. At the rear end of the second chute 13, there is a stop block 131 that is in a stop fit with the protrusions 52.

[0045] Based on the above embodiments, the utility model aims to provide a post-trigger blood collection needle, which includes a housing 1, a needle body 2, a driving spring 3, a retracting spring 4 and a pressing cap 5. The pressing cap 5 is installed at the rear end of the housing 1 and can slide along the puncture direction of the needle body 2. The needle body 2 includes a puncturing portion 21 and a connecting column 6. The connecting column 6 is arranged inside the housing 1, and the needle body 2 is accommodated in the connecting column 6. The utility model has few components and a reasonable structural design, which is conducive to realizing automatic assembly. After the needle body 2 of the blood collection needle is triggered and pricks into the skin, it can immediately retract the needle and cannot be triggered again, avoiding secondary use or scratching people and causing cross-infection. The connecting column 6 is arranged inside the housing 1. The connecting column 6 includes a sliding rod 61 and a protective cap 62 that can be broken torsionally connected to the sliding rod 61. The front end of the protective cap 62 protrudes from the front end of the housing 1. After the protective cap 62 is broken torsionally, the puncturing portion 21 protrudes from the sliding rod 61. Before use, the needle body 2 is always inside the connecting column 6, avoiding contamination caused by the exposure of the needle body 2 to the air. During use, the protective cap 62 is broken torsionally and the protective cap 62 is removed along the puncture direction of the needle body 2. At this time, the puncturing portion 21 of the needle body 2 protrudes from the sliding rod 61, and the user can press the pressing cap 5 to eject the needle for use, which is convenient to operate and suitable for different users. The driving spring 3 is abutted between the pressing cap 5 and the rear end of the sliding rod 61, and the retracting spring 4 is abutted between the front end of the housing 1 and the front end of the sliding rod 61. The driving spring 3 is an energy storage mechanism, which is ingeniously matched with the connecting column 6 and the needle body 2. After the driving spring 3 is compressed, it stores energy. When the lug 611 is broken, the driving spring 3 releases the stored energy to realize the triggering of the needle body 2, making the needle body 2 eject the needle stably and applicable to users with different strengths. After blood collection is completed, under the elastic force of the retracting spring 4, the needle body 2 will quickly retract, reducing the staying time of the needle body 2 inside the patient's finger and reducing the patient's pain. The two sides of the pressing cap 5 are provided with outwardly extending protrusions 52, and the inner side of the housing 1 is provided with a second chute 13 that is slidably matched with the protrusions 52. The rear end of the second chute 13 is provided with a stop block 131 that is stop-matched with the protrusions 52. Through the cooperation of the lug 611 and the first chute 11 and the cooperation of the protrusions 52 and the second chute 13, the triggering direction of the sliding rod 61 is limited, improving the stability of the triggering of the needle body 2 and reducing the pain caused by the shaking of the needle body 2 to the patient. The stop block 131 is stop-matched with the protrusions 52 to prevent the pressing cap 5 from detaching from the housing 1.

[0046] As another preferred embodiment of the present utility model, a through hole 12 for the protective cap 62 to pass through is provided at the front end of the housing 1, and a convex block 621 which is in a blocking fit with the through hole 12 is provided on the outer wall of the protective cap 62 to limit the forward movement of the protective cap 62 relative to the housing 1; by twisting the protective cap 62, the convex block 621 can be disengaged from the blocking fit with the through hole 12, so that the protective cap 62 can move forward out of the housing 1. The through hole 12 is a square hole, and the cross section of the convex block 621 is square. In this embodiment, when not in use, as Figure 3 shown, the convex block 621 is in a blocking fit with the through hole 12 to limit the forward movement of the protective cap 62 relative to the housing 1, thereby preventing the accidental separation of the protective cap 62 from the needle puncture part 21; when in use, as Figure 5 shown, twist the protective cap 62 until the convex block 621 is disengaged from the blocking fit with the through hole 12, so that the protective cap 62 can move forward out of the housing 1, thereby separating the protective cap 62 from the needle puncture part 21.

[0047] As another preferred embodiment of the present utility model, a concave ring part 63 is provided at the connection between the sliding rod 61 and the protective cap 62. A frustum part 613 is provided at the front end of the sliding rod 61. In this embodiment, as Figure 7 , Figure 8 shown, the setting of the concave ring part 63 facilitates breaking the protective cap 62 and separating it from the sliding rod 61. The frustum part 613 at the front end of the sliding rod 61 mainly plays a guiding role to guide the retracting spring 4 to be properly sleeved on the frustum part 613.

[0048] As another preferred embodiment of the present utility model, a socket part 612 for socketing and cooperating with the driving spring 3 is provided at the rear end of the sliding rod 61. A convex platform 51 for socketing with the driving spring 3 is provided at the center of the pressing cap 5. In this embodiment, as Figure 9 shown, the positioning of both ends of the driving spring 3 is realized through the socket part 612 and the convex platform 51, avoiding the displacement of the driving spring 3.

[0049] As another preferred embodiment of the present utility model, the cross sections of the housing 1 and the pressing cap 5 are both oval. In this embodiment, as Figure 1 shown, compared with the cylindrical outer wall, the oval outer wall is more conducive to grasping, not easy to slide, and has better stability.

[0050] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present utility model.

Claims

1. A post-trigger blood collection needle, comprising a housing (1), a needle body (2), a driving spring (3), a retracting spring (4) and a pressing cap (5). The pressing cap (5) is installed at the rear end of the housing (1) and can slide along the puncture direction of the needle body (2). The needle body (2) includes a puncturing portion (21), and is characterized in that: It further includes a connecting column (6). The connecting column (6) is arranged inside the outer shell (1). The needle body (2) is accommodated in the connecting column (6). The connecting column (6) includes a sliding rod (61) and a protective cap (62) that is torsionally breakable connected to the sliding rod (61). The front end of the protective cap (62) protrudes from the front end of the outer shell (1). After the protective cap (62) is broken off by torsion, the puncturing part (21) protrudes from the sliding rod (61). The driving spring (3) is abutted between the pressing cap (5) and the rear end of the sliding rod (61). The retracting spring (4) is abutted between the front end of the outer shell (1) and the front end of the sliding rod (61). On both sides of the rear end of the sliding rod (61), breakable lugs (611) are provided. Inside the outer shell (1), a first sliding groove (11) that is slidably engaged with the lugs (611) is provided. At the front end of the first sliding groove (11), a stop step (111) that is in stop cooperation with the lugs (611) is formed. The stop step (111) and the lugs (611) are in stop cooperation to limit the sliding rod (61) in the initial position. By pressing the pressing cap (5), the lugs (611) are broken, so as to release the axial restriction of the stop step (111) on the sliding rod (61), enabling the needle body (2) to be fired along the puncturing direction under the elastic force of the driving spring (3). After being fired, the needle body (2) retracts into the outer shell (1) under the transmission of the elastic force of the retracting spring (4).

2. The after-firing blood collection needle according to claim 1, characterized in that: At the front end of the outer shell (1), a through hole (12) for the protective cap (62) to pass through is provided. On the outer wall of the protective cap (62), a convex block (621) that is in stop cooperation with the through hole (12) is provided to limit the forward movement of the protective cap (62) relative to the outer shell (1). By twisting the protective cap (62), the convex block (621) can be disengaged from the stop cooperation with the through hole (12), so that the protective cap (62) moves forward out of the outer shell (1).

3. A post-firing blood collection needle according to claim 1 or 2, characterized in that: At the connection part between the sliding rod (61) and the protective cap (62), a concave ring part (63) is provided.

4. A post-firing blood collection needle according to claim 1 or 2, characterized in that: At the rear end of the sliding rod (61), a socket part (612) for sleeving and cooperating with the driving spring (3) is provided.

5. A post-triggering blood collection needle according to claim 1 or 2, characterized in that: At the front end of the sliding rod (61), a frustum part (613) is provided.

6. The after-firing blood collection needle according to claim 2, wherein: The through hole (12) is a square hole, and the cross section of the convex block (621) is square.

7. A rear-firing blood collection needle according to claim 1, characterized in that: At the center of the pressing cap (5), a convex platform (51) for sleeving the driving spring (3) is provided.

8. The after-firing blood collection needle according to claim 1, wherein: On both sides of the pressing cap (5), protrusions (52) extending outward are provided. Inside the outer shell (1), a second sliding groove (13) that is slidably engaged with the protrusions (52) is provided. At the rear end of the second sliding groove (13), a stop block (131) that is in stop cooperation with the protrusions (52) is provided.

9. The after-firing blood collection needle according to claim 1, characterized in that: The cross sections of the outer shell (1) and the pressing cap (5) are both oval.

10. A post-firing blood collection needle according to claim 1, characterized in that: Both the driving spring (3) and the retracting spring (4) are return springs.

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