Lancet

Abstract

The utility model provides a kind of blood taking needle, this blood taking needle includes needle head body, pedestal and hose, one end of needle head body is connected to pedestal, main flow passage that is communicated with the blood taking pipeline of needle head body is formed in pedestal, and, pedestal is connected with hose and hose is communicated with main flow passage, the free end of hose is connected vacuum tube. First detection flow passage and second detection flow passage are formed in the axial direction of main flow passage in pedestal, first detection flow passage and second detection flow passage are communicated with each other and are all communicated with main flow passage, at least in the outer surface of the corresponding position of first detection flow passage and second detection flow passage, transparent visible window is formed, in the process of blood taking, medical staff can accurately adjust the posture of needle head body according to the flow information feedback in transparent visible window, reduce the work difficulty of medical staff, ensure that blood flow is unobstructed in the process of blood taking, improve blood taking efficiency, also reduce the risk of repeatedly pricking patients.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a blood collection needle. Background Technology

[0002] Clinical blood collection is a very common medical procedure nowadays. Obtaining blood samples through clinical blood collection is the basis for disease diagnosis and is also the most basic medical procedure in various hospitals.

[0003] During blood collection, the position of the lancet inserted into the vein is crucial to ensuring smooth blood flow. If the needle is inserted too shallowly or too deeply, or deviates from the optimal position of the blood vessel, it may lead to poor blood flow. For example, if the needle is inserted too shallowly, it may not be able to fully enter the blood vessel, or if the needle is inserted too deeply, it may penetrate the blood vessel wall, which will also hinder blood flow. Even if the needle has successfully penetrated the skin and entered the blood vessel area, the needle may still be partially or completely pressed against the blood vessel wall, which may still lead to poor blood flow.

[0004] In existing technologies, when medical staff use vacuum blood collection devices to collect blood from patients, they cannot directly perceive the needle's position inside the body after insertion. They often rely on their skills and experience to adjust the needle's posture to ensure accurate insertion into the vein and successful blood collection. However, for medical staff less skilled in blood collection techniques, or for patients with thin or deep veins, they may be unable to accurately adjust the needle's position, leading to poor blood flow and significantly impacting collection efficiency. Furthermore, this can cause the needle to puncture a blood vessel, resulting in rupture, swelling, and failed blood collection, increasing the patient's pain. Moreover, the inability to accurately insert the needle into the correct location not only causes psychological fear in the patient but also creates psychological stress and frustration for the operating nurse regarding subsequent punctures. Utility Model Content

[0005] The purpose of this invention is to solve the technical problem in the prior art that medical staff may not be able to accurately adjust the position of the needle after it has been inserted into the patient's body because they cannot visually know the position of the needle inside the body.

[0006] To solve the above-mentioned technical problems, the present invention discloses a blood collection needle, which includes a needle body, a base, and a tubing. A blood collection channel is formed in the needle body extending along the axial direction of the needle body. One end of the needle body is connected to the base. A main channel is formed in the base that communicates with the blood collection channel of the needle body. The base is connected to the tubing, and the tubing communicates with the main channel. The free end of the tubing is connected to a vacuum tube.

[0007] The base contains a first detection channel and a second detection channel located beside the main channel, spaced apart along the axis of the main channel. The first detection channel is located on the side of the second detection channel closer to the needle body. Both the first and second detection channels extend along an axis perpendicular to the main channel and are flush with each other. The diameter of the main channel between the first and second detection channels is smaller than the diameter at other locations.

[0008] The ends of the first and second detection channels closest to the main channel are connected to the main channel, while the ends of the first and second detection channels away from the main channel are connected through an annular channel.

[0009] Furthermore, a transparent viewing window is formed on the base at least on the outer surface at the corresponding positions of the first and second detection channels.

[0010] When using this blood collection needle, medical staff can insert the needle body into the patient's body. When the free end of the needle body penetrates the skin and enters the blood vessel area, the blood in the blood vessel flows out from the blood collection channel of the needle body and enters the main channel of the base and the tubing. Medical staff can judge whether the needle part has penetrated the blood vessel based on the blood flowing out of the tubing.

[0011] Furthermore, when blood flows from the blood collection channel of the needle body into the base and flows within the main channel, some blood enters the first and second detection channels. At this time, some gas in the first, second, and annular channels cannot escape in time, forming an air column within these channels. Because the diameter of the main channel between the first and second detection channels is smaller than that at other locations, based on Bernoulli's theorem, the blood velocity increases when flowing through this area. This creates a pressure difference in the main channel at the corresponding positions of the first and second detection channels. This pressure difference is proportional to the blood flow rate; specifically, the greater the flow rate, the greater the pressure difference, and vice versa. To put it more intuitively, the greater the flow rate in the main flow channel, the greater the difference in length between the air column in the first and second flow channels that medical staff may see through the transparent viewing window; conversely, the smaller the flow rate in the main flow channel, the smaller the difference in length between the air column in the first and second flow channels that medical staff may see through the transparent viewing window.

[0012] When adjusting the position of the needle body within the blood vessel, medical staff can make adjustments based on the flow rate in the main flow channel as reflected by the transparent viewing window. For example, if the medical staff finds that the length difference between the air column in the first and second detection channels is small, and after lifting the needle body, the length difference between the air column in the first and second detection channels increases, it indicates that the adjustment direction of the needle body is correct. If the length difference between the air column in the first and second detection channels decreases, it indicates that the adjustment direction of the needle body is incorrect, and the medical staff needs to change the adjustment direction of the needle body.

[0013] Therefore, the blood collection needle provided by this utility model has a first detection flow channel and a second detection flow channel cleverly set in the base. Medical staff can accurately adjust the posture of the needle body according to the flow information fed back in the transparent viewing window, which reduces the difficulty of medical staff's work, ensures smooth blood flow during blood collection, improves blood collection efficiency, and also reduces the risk of repeated needle pricks to patients.

[0014] Furthermore, in one embodiment, the diameters of the first detection channel, the second detection channel, and the annular channel are all the same and smaller than the diameter of the main channel. This structure ensures that after the blood flows into the main channel, the vast majority of the blood flows through the main channel, and only a small portion of the blood flows into the first and second detection channels. This prevents blood from flowing into the first detection channel and flowing out of the annular and second detection channels to form a loop, thus preventing the formation of an air column. In addition, the fact that the first detection channel, the second detection channel, and the annular channel all have the same diameter helps to maintain consistent fluid dynamics within the channels, thereby more accurately reflecting changes in flow rate within the main channel.

[0015] The ratio of the pipe diameter of the first detection channel, the second detection channel, and the annular channel to the pipe diameter of the main channel is in the range of 1:3 to 1:5.

[0016] To facilitate operation by medical personnel, in one embodiment, the base further includes a grip, on which the first detection channel, the second detection channel, and the annular channel are all located. Furthermore, a transparent viewing window is formed on one side surface of the grip.

[0017] During use, medical staff can hold the needle relatively firmly through the grip, so as to smoothly insert the needle body into the human body and accurately adjust the posture of the needle body.

[0018] Furthermore, during blood collection, multiple tubes of blood are often collected for different tests. When changing the vacuum tube, the needle body inserted into the blood vessel may be pulled by the tubing, resulting in displacement. In order to ensure that the needle does not easily shake due to external force during blood collection, in one embodiment, a support part is provided on the side of the base away from the gripping part.

[0019] An adhesive portion is provided on the other side surface of the gripping part and the corresponding surface of the supporting part.

[0020] During use, medical staff hold the needle body through the grip and insert the needle tip into the patient's blood vessel. They then visually adjust the needle body according to the flow rate in the main channel as reflected by the transparent viewing window until the needle body is in the expected position. Finally, the base is fixed to the patient's body surface through the adhesive parts on the grip and support, thus preventing the needle from easily shaking due to external forces during blood collection. This improves the accuracy and safety of blood collection and also facilitates the replacement of vacuum tubes by medical staff. Attached Figure Description

[0021] Figure 1 A schematic diagram of the structure of a blood collection needle provided for an embodiment of this utility model;

[0022] Figure 2 A cross-sectional view of a blood collection needle provided for an embodiment of this utility model;

[0023] Figure 3 A schematic diagram of the first detection channel, the second detection channel, the annular channel, and the main channel of the blood collection needle provided for an embodiment of this utility model;

[0024] Figure 4 Another schematic diagram of the first detection channel, the second detection channel, the annular channel, and the main channel of the blood collection needle provided for an embodiment of this utility model;

[0025] Figure 5 A side view of the blood collection needle with a transparent viewing window provided in an embodiment of this utility model;

[0026] Figure 6 A side view of the side of the blood collection needle with the adhesive portion provided in an embodiment of this utility model;

[0027] Figure 7 A side view of the side of the blood collection needle with the adhesive part (double-sided adhesive with a covering release paper) provided in an embodiment of the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 10. Blood lancets;

[0030] 100. Needle body; 110. Blood collection channel; 120. Auxiliary blood collection port;

[0031] 200. Base;

[0032] 210. Main flow path; 211. Annular throttling section;

[0033] 220. First detection channel; 230. Second detection channel; 240. Annular channel;

[0034] 250. Grip part; 251. Grip plate; 252. Stripe; 260. Support part; 261. Support plate; 262. Sleeve;

[0035] 201. Transparent viewing window; 202. Adhesive part; 203. Double-sided adhesive tape; 204. Release paper; 205. Curved edge; 300. Tube. Detailed Implementation

[0036] As noted in the background section, when drawing blood from patients, medical staff cannot accurately determine the position of the needle inside the body. Traditional blood collection needles lack intuitive feedback after being inserted into the body, making it difficult for medical staff to know in a timely manner whether the needle has accurately entered the blood vessel. This may result in poor blood collection or require multiple attempts, increasing the patient's pain and the difficulty of operation for medical staff.

[0037] To address this, the present invention provides a blood collection needle comprising a needle body, a base, and a flexible tube. One end of the needle body is connected to the base. A main flow channel communicating with the blood collection channel of the needle body is formed within the base. The base is connected to the flexible tube, which is also connected to the main flow channel. The free end of the flexible tube is connected to a vacuum tube. A first detection channel and a second detection channel are formed at intervals along the axial direction of the main flow channel within the base. The first and second detection channels are interconnected and both communicate with the main flow channel. A transparent viewing window is formed on the outer surface of the base, at least at positions corresponding to the first and second detection channels. During blood collection, medical personnel can accurately adjust the posture of the needle body based on the flow information fed back through the transparent viewing window, reducing the workload for medical personnel, ensuring smooth blood flow during blood collection, improving blood collection efficiency, and reducing the risk of repeated needle pricks on patients.

[0038] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0039] like Figure 1As shown, this embodiment provides a blood collection needle 10, which includes a needle body 100, a base 200, and a tubing 300. A blood collection channel is formed in the needle body 100 extending along the axial direction of the needle body 100. One end of the needle body 100 is connected to the base 200. A main channel 210 communicating with the blood collection channel of the needle body 100 is formed in the base 200. The base 200 is connected to the tubing 300, and the tubing 300 is connected to the main channel 210. The free end of the tubing 300 is connected to a vacuum tube (not shown in the figure). Regarding the connection method between the tubing 300 and the vacuum tube, this embodiment does not specifically limit it. For example, a clamp connector can be provided at the free end of the tubing 300, and the tubing can be detachably connected to the vacuum tube through the clamp connector.

[0040] When using this blood collection needle 10, medical staff can insert the needle body 100 into the patient's body. When the free end of the needle body 100 penetrates the skin and enters the blood vessel area, the blood in the blood vessel flows out from the blood collection channel 110 of the needle body 100 and enters the main channel 210 of the base 200 and the tubing 300. Medical staff can determine whether the needle part has penetrated the blood vessel based on the blood flowing out of the tubing 300.

[0041] Among them, such as Figure 2 As shown, a first detection channel 220 and a second detection channel 230 are formed at intervals along the axial direction of the main channel 210 within the base 200, located beside the main channel 210. The first detection channel 220 is located on the side of the second detection channel 230 close to the needle body 100. Both the first detection channel 220 and the second detection channel 230 extend along the axial direction perpendicular to the main channel 210 and are flush with each other. The diameter of the main channel 210 between the first detection channel 220 and the second detection channel 230 is smaller than the diameter at other locations.

[0042] The first detection channel 220 and the second detection channel 230 are connected to the main channel 210 at their ends near the main channel 210, and the ends of the first detection channel 220 and the second detection channel 230 away from the main channel 210 are connected through the annular channel 240.

[0043] Furthermore, on the base 200, at least on the outer surface at the corresponding positions of the first detection channel 220 and the second detection channel 230, a transparent viewing window 201 is formed.

[0044] When blood from the blood collection channel 110 of the needle body 100 flows into the base 200 and flows within the main flow channel 210, some blood enters the first detection channel 220 and the second detection channel 230. At this time, some gas in the first detection channel 220, the second detection channel 230, and the annular channel 240 cannot escape in time, forming an air column within these channels. Furthermore, because the diameter of the main flow channel 210 located between the first and second detection channels 220 and 230 is smaller than at other locations, based on Bernoulli's theorem, the blood velocity increases when flowing through this area. A pressure difference is formed in the main flow channel 210 at the locations corresponding to the first and second detection channels 220 and 230. This pressure difference has a proportional relationship with the blood flow rate; specifically, the greater the flow rate, the greater the pressure difference; conversely, the smaller the flow rate, the smaller the pressure difference. To put it more intuitively, the greater the flow rate in the main flow channel 210, the greater the difference in length between the air column in the first detection channel 220 and the air column in the second detection channel 230 that medical staff may see through the transparent viewing window 201; the smaller the flow rate in the main flow channel 210, the smaller the difference in length between the air column in the first detection channel 220 and the air column in the second detection channel 230 that medical staff may see through the transparent viewing window 201.

[0045] When adjusting the position of the needle body 100 within the blood vessel, medical staff can make adjustments based on the flow rate within the main flow channel 210, as indicated by the transparent viewing window 201. For example, if the medical staff finds that the length difference between the air column in the first detection channel 220 and the air column in the second detection channel 230 is small, and after the medical staff lifts the needle body 100, the length difference between the air column in the first detection channel 220 and the air column in the second detection channel 230 becomes larger (e.g., Figure 3 (As shown), this indicates that the adjustment direction of the needle body 100 is correct. If the length difference between the air column in the first detection channel 220 and the air column in the second detection channel 230 decreases (e.g.) Figure 4 If the needle body 100 is not adjusted in the correct direction (as shown in the image), it indicates that the adjustment direction of the needle body 100 is incorrect, and medical personnel need to change the adjustment direction of the needle body 100.

[0046] Therefore, the blood collection needle 10 provided by this utility model has a first detection channel 220 and a second detection channel 230 cleverly set in the base 200. Medical staff can accurately adjust the posture of the needle body 100 according to the flow information fed back in the transparent viewing window 201, which reduces the difficulty of medical staff's work, ensures smooth blood flow during blood collection, improves blood collection efficiency, and also reduces the risk of repeated needle pricks to patients.

[0047] The needle body 100, as the main component of the blood collection needle 10, is used to pierce the human body and extract blood from the blood vessels. The needle body 100 is usually made of high-quality medical stainless steel, which has extremely high sharpness and corrosion resistance, ensuring rapid and smooth penetration of the skin and reducing pain.

[0048] Specifically, the needle body 100 has a blood collection channel 110 formed within its inner circumference for blood flow. Furthermore, the free end of the needle body 100 is generally designed with a beveled incision, for example, the beveled incision at the tip has three or five facets. Taking five facets as an example, these five facets include a main facet, a pair of tip facets, and a pair of intermediate facets. Each intermediate facet is located between the main facet and the corresponding tip facet. The geometry of the five-facet needle makes the transition between its bevels smoother, without abrupt intersections or transitional bevels, thereby reducing the puncture force required to penetrate the skin and making the puncture process smoother. In addition, because the five-facet needle is easier to puncture, it can reduce damage and friction to skin tissue, thereby reducing pain during injection. The tip of a three-facet needle is similar to that of a five-facet needle, and will not be described further here.

[0049] Furthermore, in order to ensure smooth blood flow during blood collection, in one embodiment, the sidewall of the needle body 100 is located on the side closer to the needle tip, forming an auxiliary blood collection hole 120 that penetrates the sidewall of the needle body 100, so that blood can still be collected through the auxiliary blood collection hole 120 even if the needle tip is partially blocked.

[0050] Of course, this embodiment does not limit the specific structure of the needle body 100, and those skilled in the art can design it according to actual conditions and specific needs.

[0051] like Figure 1 and Figure 5 As shown, the base 200 serves as a connection structure between the needle body 100 and the tubing 300. In one embodiment, the base 200 is configured as a cylindrical structure with its axial direction parallel to the axial direction of the main channel 210. The main channel 210 connecting the needle body 100 and the tubing 300 is formed inside the base 200. Regarding the connection method between the base 200 and the pillow body and the base 200, it can be the interference fit commonly used in the art, or a Krug joint connection. This embodiment does not specifically limit this.

[0052] Furthermore, in order to make the diameter of the main flow channel 210 between the first detection flow channel 220 and the second detection flow channel 230 smaller than the diameter at other locations, in one embodiment, an annular throttling portion 211 protruding towards the inside of the main flow channel 210 is formed on the inner wall of the main flow channel 210 between the first detection flow channel 220 and the second detection flow channel 230 (see...). Figure 2 ).

[0053] Specifically, when viewed along the axial direction of the main channel 210, the center of the channel cross-section formed by the annular throttling section 211 coincides with the center of the channel cross-section of the main channel 210, thereby ensuring that the blood in the main channel 210 flows relatively smoothly.

[0054] Furthermore, in one embodiment, the diameters of the first detection channel 220, the second detection channel 230, and the annular channel 240 are all the same and smaller than the diameter of the main channel 210. This structure ensures that after the blood flows into the main channel 210, most of the blood flows through the main channel 210, and only a small portion of the blood flows into the first detection channel 220 and the second detection channel 230. This prevents blood from flowing into the first detection channel 220 and flowing out of the annular channel 240 and the second detection channel 230 to form a loop, thus preventing the formation of an air column. In addition, the fact that the first detection channel 220, the second detection channel 230, and the annular channel 240 have the same diameter helps to maintain consistent fluid dynamics within the channels, thereby more accurately reflecting changes in flow rate within the main channel 210.

[0055] The ratio of the diameter of the first detection channel 220, the second detection channel 230, and the annular channel 240 to the diameter of the main channel 210 is within the range of 1:3 to 1:5. If the ratio of the diameter of the first detection channel 220, the second detection channel 230, and the annular channel 240 to the diameter of the main channel 210 is greater than the above range, it is possible that after the blood flows into the main channel 210, some blood flows into the first detection channel 220, flows through the annular channel 240 and the second detection channel 230, and then merges into the main channel 210, failing to form an air column. If the ratio of the diameter of the first detection channel 220, the second detection channel 230, and the annular channel 240 to the diameter of the main channel 210 is less than the above range, the diameter of the first detection channel 220, the second detection channel 230, and the annular channel 240 is too small, and blood flow may be blocked, failing to accurately reflect the flow rate in the main channel 210.

[0056] Specifically, the ratio of the diameter of the first detection channel 220, the second detection channel 230, and the annular channel 240 to the diameter of the main channel 210 can be 1:3, 1:4, 1:4.5, 1:5, or any other ratio within the above range. This embodiment does not limit this to a single ratio. Those skilled in the art can design according to actual conditions and specific needs. This embodiment does not limit this to a specific ratio.

[0057] To facilitate operation by medical personnel, in one embodiment, the base 200 further includes a grip portion 250, on which the first detection channel 220, the second detection channel 230, and the annular channel 240 are all located. Furthermore, a transparent viewing window 201 is formed on one side surface of the grip portion 250.

[0058] During use, medical staff can hold the needle relatively firmly through the grip 250, so as to smoothly insert the needle body 100 into the human body and accurately adjust the posture of the needle body 100.

[0059] Specifically, such as Figure 6 As shown, the gripping part 250 is configured as a gripping plate 251, which is integrally formed with the base 200. The shape of the gripping plate 251 can be as follows: Figure 6 The rectangle shown can also be a semicircle or ellipse commonly used in the art, and this embodiment does not limit it to a single shape.

[0060] It should be noted that the transparent viewing window 201 of the gripping plate 251 is actually a transparent area formed by covering a U-shaped transparent acrylic plate opposite to the first detection channel 220, the annular channel 240 and the second detection channel 230, so as to facilitate medical staff to view the air columns in the first detection channel 220 and the second detection channel 230. Of course, the transparent viewing window 201 can also be an area formed by covering other transparent materials. Those skilled in the art can design it according to the actual situation and specific needs. This embodiment does not limit it to a single one.

[0061] When holding the grip plate 251, medical staff can press the two sides of the grip plate 251 along the thickness direction with their thumb and forefinger, or they can press the two sides of the grip plate 251 along the axis of the main channel 210 with their thumb and forefinger.

[0062] Because the sidewall area of ​​the grip plate 251 in the thickness direction is small, in order to enable medical personnel to grip it more securely, multiple stripes 252 extending along the thickness direction of the grip plate 251 are formed on its sidewall (see...). Figure 1 ).

[0063] Furthermore, during blood collection, multiple tubes of blood are often needed for different tests. When changing the vacuum tube, the needle body 100 inserted into the blood vessel may be pulled by the tubing 300, causing displacement. To ensure that the needle does not easily shake due to external forces during blood collection, in one embodiment, such as... Figure 6 As shown, a support portion 260 is provided on the side of the base 200 opposite to the grip portion 250. An adhesive portion 202 is provided on the other side surface of the grip portion 250 and the corresponding surface of the support portion 260. The grip portion 250 and the support portion 260 cooperate to support the base 200 and are bonded to the human body surface through the adhesive portion 202, thus limiting slight shaking of the needle body 100 and the base 200. It should be noted that the other side surface of the grip portion 250 refers to the surface opposite to the surface where the transparent viewing window 201 is located.

[0064] like Figure 6 and Figure 7 As shown, in one embodiment, the adhesive portion 202 is configured as a double-sided adhesive tape 203 with one side attached to the grip portion 250 or the support portion 260 and the other side covered by the release paper 204. This double-sided adhesive tape 203 needs to have good breathability and comfort in order to avoid causing damage to the patient.

[0065] Furthermore, the isolation paper 204 has an outwardly extending curved edge 205 at at least one corner, which makes it easier for medical staff to lift the isolation paper 204.

[0066] Specifically, in one embodiment, the support 260 is configured as a support plate 261, which is rotatably connected to the base 200. The support plate 261 can rotate relative to the base 200 around the axis of the main channel 210. Even if the needle body 100 is pulled and displaced during blood collection, the needle body 100 located in the human body can be raised or lowered by adjusting the angle between the support plate 261 and the grip plate 251.

[0067] The connection structure between the support plate 261 and the base 200 is described below.

[0068] In one embodiment, the support portion 260 further includes two sleeves 262 connected to the support plate 261 and spaced apart along the axial direction of the main channel 210. The two sleeves 262 are respectively fitted onto the two ends of the base 200 along its axial direction, allowing the support plate 261 to rotate relative to the base 200 via the two sleeves 262. It should be noted that the contact surfaces between the two sleeves 262 and the base 200 have a high coefficient of friction, ensuring that the support plate 261 can be maintained in any position, thereby providing support for the base 200. When the position of the support plate 261 needs to be adjusted, medical personnel can rotate either sleeve 262 to overcome the friction between the two sleeves 262 and the base 200, thus changing the orientation of the support plate 261.

[0069] During use, medical staff hold the needle body 100 through the grip 250, insert the needle tip into the patient's blood vessel, and visually adjust the needle body 100 according to the flow rate in the main channel 210 fed back by the transparent viewing window 201 until the needle body 100 is in the expected position. Then, the base 200 is fixed to the patient's body surface through the adhesive part 202 on the grip 250 and the support part 260, thereby preventing the needle from easily shaking due to external force during blood collection, improving the accuracy and safety of blood collection, and also facilitating the operation of changing the vacuum tube by medical staff.

[0070] Furthermore, when the support plate 261 is rotatably connected to the base 200, after the needle body 100 is positioned in the intended location within the blood vessel, the base 200 is fixed to the patient's body surface via the adhesive portion 202 on the grip portion 250 and the support portion 260. However, when medical personnel change the vacuum tube for collecting blood, they may accidentally pull on the needle body 100, causing a change in the position of the needle body 100. This results in a change in the length difference between the air column in the first detection channel 220 and the air column in the second detection channel 230. As the size decreases, medical staff can adjust the position of the support plate 261. For example, by rotating the support plate 261 towards the patient's body surface, the base 200 is raised, causing the needle body 100 located in the blood vessel to sink. Alternatively, by rotating the support plate 261 away from the patient's body surface, the base 200 is lowered, causing the needle body 100 located in the blood vessel to rise. After adjustment, the length difference between the air column in the first detection channel 220 and the air column in the second detection channel 230 increases, thereby improving blood flow.

[0071] Of course, this embodiment does not limit the connection structure between the support plate 261 and the base 200 to a single one, and those skilled in the art can design it according to actual conditions and specific needs.

[0072] It should be noted that, in addition to the specific embodiments described above, those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model is presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to that embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. In order to provide a deep understanding of this utility model, many specific details are included in the above description, and this utility model may also be implemented without using these details. In addition, in order to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0073] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0074] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0075] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0076] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0077] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A blood collection needle, characterized in that, The device includes a needle body, a base, and a tubing. A blood collection channel extending along the axial direction of the needle body is formed within the needle body. One end of the needle body is connected to the base. A main channel communicating with the blood collection channel of the needle body is formed within the base. The base is connected to the tubing, and the tubing communicates with the main channel. The free end of the tubing is connected to a vacuum tube. The base contains a first detection channel and a second detection channel located beside the main channel, spaced apart along the axial direction of the main channel. The first detection channel is located on the side of the second detection channel closer to the needle body. Both the first and second detection channels extend along an axial direction perpendicular to the main channel and are flush with each other. The diameter of the main channel between the first and second detection channels is smaller than the diameter at other locations. The first detection channel and the second detection channel are connected to the main channel at their ends near the main channel, and their ends away from the main channel are connected via an annular channel; furthermore... A transparent viewing window is formed on the base at least on the outer surface of the corresponding positions of the first detection channel and the second detection channel.

2. The blood collection needle as described in claim 1, characterized in that, The diameters of the first detection channel, the second detection channel, and the annular channel are all the same and smaller than the diameter of the main channel; wherein, The ratio of the diameter of the first detection channel, the second detection channel, and the annular channel to the diameter of the main channel is in the range of 1:3 to 1:

5.

3. The blood collection needle as described in claim 2, characterized in that, On the inner wall of the main flow channel, an annular throttling portion protruding towards the inner side of the main flow channel is formed between the first detection channel and the second detection channel; wherein, Viewed along the axial direction of the main channel, the center of the channel cross-section formed by the annular throttling section coincides with the center of the channel cross-section of the main channel.

4. The blood collection needle according to any one of claims 1 to 3, characterized in that, The base also includes a gripping portion, on which the first detection channel, the second detection channel, and the annular channel are all located; and... The transparent viewing window is formed on one side surface of the grip portion.

5. The blood collection needle as described in claim 4, characterized in that, The base has a support portion located on the side opposite to the gripping part; wherein... An adhesive portion is provided on the other side surface of the gripping portion and the corresponding surface of the supporting portion.

6. The blood collection needle as described in claim 5, characterized in that, The adhesive portion is configured as follows: a double-sided adhesive tape with one side attached to the gripping portion or the supporting portion, and the other side covered by release paper; and... The release paper has an outwardly extending curled edge at at least one corner.

7. The blood collection needle as described in claim 5, characterized in that, The base is configured as a cylindrical structure with its axis parallel to the axis of the main channel; the gripping part is configured as a gripping plate; and the supporting part is configured as a supporting plate. The gripping plate is integrally formed with the base, the support plate is rotatably connected to the base, and the support plate can rotate relative to the base about the axis of the main channel.

8. The blood collection needle as described in claim 7, characterized in that, The support portion further includes two sleeves connected to the support plate and spaced apart along the axial direction of the main channel; wherein, The two sleeves are respectively fitted onto the two ends of the base along its axial direction.

9. The blood collection needle as described in claim 7, characterized in that, Multiple stripes extending along the thickness direction of the grip plate are formed on its sidewall.

10. The blood collection needle according to any one of claims 1-3, characterized in that, The sidewall of the needle body is located on the side near the needle tip, forming an auxiliary blood collection hole that penetrates the sidewall of the needle body.

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