Anti-stabbing intravenous blood taking needle

Abstract

The utility model belongs to the technical field of medical apparatus and instruments, and particularly relates to a puncture-preventing venous blood taking needle. The puncture-preventing venous blood taking needle comprises a blood taking needle body, a blood injection needle body, a hose and a puncture-preventing mechanism, the blood taking needle body comprises a blood taking needle head, a blood taking needle head seat and a blood taking needle wing; the blood injection needle body comprises a blood injection needle head, a blood injection needle head seat and two elastic pressing pieces; the puncture-preventing mechanism comprises a first protection assembly and a second protection assembly which are arranged on the blood taking needle head seat and the blood injection needle head seat respectively. When the blood taking amount in the blood taking tube reaches the required blood amount, the blood in the hose is cut off by pressing the two elastic pressing pieces, blood continues to enter the blood taking tube is prevented, the blood taking amount in the blood taking tube and the proportion of the coagulant or the anticoagulant in the blood taking tube are correct, and when the blood injection needle body is separated from the blood taking tube, the hose is pressed by the two elastic pressing pieces, blood dripping from the blood injection needle head to contaminate the hands of medical staff or the operation table top is prevented.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a puncture-proof intravenous blood collection needle. Background Technology

[0002] Blood collection is an indispensable part of medical diagnosis and treatment, and the safety and convenience of the blood collection needle, as a key tool in this process, are of paramount importance. Traditional blood collection needles have the following main problems: 1. Inaccurate control of blood volume: Traditional blood collection needles mainly control the blood volume by folding back the tubing on the needle. However, when changing different blood collection tubes, one hand has to fold back the tubing and connect the blood collection tube. This not only easily leads to the tubing not being folded back properly and blood continuing to flow into the blood collection tube, but also to improper force when connecting the blood collection tube, causing the needle to be pulled out, increasing patient pain; 2. High risk of needlestick injury: Traditional blood collection needles do not have secondary protective sleeves on the needle tip and injection needle tip. Medical staff are prone to needlestick injuries if they are not careful when connecting the blood collection tube. Furthermore, after blood collection, both the needle tip and injection needle tip are exposed on the outside, making it easy for medical staff to be injured. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a simple, safe, and puncture-resistant venous blood collection needle.

[0004] The present invention adopts the following technical solution:

[0005] A puncture-resistant venous blood collection needle is used to draw blood from a patient into a blood collection tube. It includes a blood collection needle body, an injection needle body, a tubing, and an anti-puncture mechanism. The blood collection needle body is used to puncture a patient's vein and includes a blood collection needle tip connected to one end of the tubing, a blood collection needle tip seat at one end of the blood collection needle tip, and a blood collection needle wing on one side of the blood collection needle tip seat. The injection needle body includes an injection needle tip connected to the other end of the tubing, an injection needle tip seat at one end of the injection needle tip, and two elastic pressing tabs extending towards the tubing from opposite sides of the injection needle tip seat. When the two elastic pressing tabs are pressed, the tubing is compressed. The anti-puncture mechanism includes a first protective component and a second protective component respectively disposed on the blood collection needle tip seat and the injection needle tip seat. After blood collection is completed, the blood collection needle tip is located within the first protective component, and the injection needle tip is located within the second protective component.

[0006] Furthermore, the first protective component includes a first protective sleeve movably disposed within the blood collection needle holder, two elastic limiting components disposed opposite to each other on the outside of the blood collection needle holder to restrict the first protective sleeve on the blood collection needle holder near one end of the tubing, and a first fixing component disposed between the first protective sleeve and the blood collection needle holder. When the first protective sleeve is disengaged from between the two elastic limiting components, the blood collection needle is located within the first protective sleeve.

[0007] Furthermore, the first protective sleeve includes a movable plate extending outward on one side thereon and a limiting plate disposed on the surface of the movable plate opposite to the tubing. The blood collection needle holder includes an installation cavity formed therein for installing the first protective sleeve and a guide groove extending inward along its length and communicating with the installation cavity to allow the movable plate to move back and forth. The front and rear sides of the limiting plate can contact two elastic limiting components.

[0008] Furthermore, the elastic limiting component includes two elastic limiting blocks respectively disposed on both sides of the guide groove opening and opposite to one side of the limiting plate. When the moving plate is pulled forcefully towards the blood collection needle, one side of the limiting plate and the two opposite elastic limiting blocks are deformed, and the limiting plate disengages from the two elastic limiting blocks.

[0009] Furthermore, the first fixing component includes two elastic fixing blocks disposed opposite to each other on both sides of the guide groove opening near the blood collection needle tip, allowing the movable plate to pass through, and a clearance hole disposed on the movable plate that cooperates with the two elastic fixing blocks. When the two elastic fixing blocks are located in the clearance hole, the first protective sleeve is fixedly located on the outside of the blood collection needle tip.

[0010] Furthermore, the second protective component includes a second protective sleeve movably disposed within the needle holder, a spring detachably disposed within the needle holder with one end abutting against the end of the second protective sleeve and the other end abutting against the interior of the needle holder, a positioning component disposed between the second protective sleeve and the needle holder to prevent the second protective sleeve from rotating, and a second fixing component disposed between the needle holder and the second protective sleeve to prevent the second protective sleeve from retracting into the needle holder.

[0011] Furthermore, the injection needle holder includes an installation groove formed therein for installing the second protective sleeve and the spring, and the positioning assembly includes two positioning blocks disposed opposite to each other on the outside of the second protective sleeve, two positioning grooves respectively disposed on both sides of the injection needle holder extending outward and opposite to the two positioning blocks, and a positioning cover threadedly connected to the end of the injection needle holder to prevent the positioning blocks from sliding out of the opposite positioning groove.

[0012] Furthermore, the second fixing component includes a knob seat extending outward from one side of the blood injection needle holder and communicating with the mounting groove, a fixing knob movably disposed within the knob seat, and a fixing hole disposed on the second protective sleeve that can cooperate with the fixing knob.

[0013] Furthermore, the elastic pressing pad includes a pressing pad body that is easy to press by hand and a protrusion block disposed on the surface of the pressing pad body opposite to the hose. When the two elastic pressing pads press the hose, the two protrusion blocks abut against each other.

[0014] Furthermore, both the blood collection needle and the blood injection needle are equipped with disposable needle sleeves.

[0015] As can be seen from the above description of this utility model, compared with the prior art, the beneficial effects of this utility model are as follows: By defining the specific structure of the injection needle body, the injection needle body, through the interaction between the injection needle tip, the injection needle tip seat, and two elastic pressing plates that are respectively arranged on the side of the injection needle tip seat and extend towards the tubing, when the blood volume in the blood collection tube reaches the required blood volume, the blood in the tubing is cut off by pressing the two elastic pressing plates, preventing blood from continuing to enter the blood collection tube, thus ensuring that the ratio of the blood volume in the blood collection tube to the coagulant or anticoagulant in the blood collection tube is correct. Furthermore, when the injection needle body is separated from the blood collection tube, the tubing is held down by the two elastic pressing plates, preventing blood from dripping out from the injection needle tip and contaminating the hands of medical staff or the work surface. At the same time, by defining the specific structure of the anti-puncture mechanism, a first protective component and a second protective component are added to the blood collection needle tip and the injection needle tip, so that the blood collection needle tip and the injection needle tip are covered by the first protective component and the second protective component, which can protect patients and medical staff from being punctured and improve the safety of venous blood collection needles.

[0016] By setting the first fixing component between the first protective sleeve and the blood collection needle holder, the first protective sleeve can be fixed to the outside of the blood collection needle to avoid injuring medical staff or puncturing medical waste bags during recycling.

[0017] By using two elastic limiting components that are positioned opposite each other on the outside of the blood collection needle holder, the movement of the first protective sleeve can be restricted, so as not to affect the normal use of the blood collection needle.

[0018] The second protective sleeve, which is movably installed in the blood injection needle holder, the spring, which is detachably installed in the blood injection needle holder, and the positioning component between the second protective sleeve and the blood injection needle holder cooperate to allow the second protective sleeve to automatically extend out of the blood injection needle holder, thereby covering the blood injection needle inside the second protective sleeve, which can prevent medical personnel from being pricked during the process of connecting or disconnecting blood collection tubes.

[0019] By using a second fixing component between the injection needle holder and the second protective sleeve, the second protective sleeve can be prevented from retracting into the injection needle holder, ensuring that the injection needle remains inside the second protective sleeve during retraction. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a venous blood collection needle.

[0021] Figure 2 This is a schematic diagram of a venous blood collection needle in the blood collection state.

[0022] Figure 3 This is a schematic diagram of a venous blood collection needle in the retrieved state.

[0023] Figure 4 A partial structural breakdown of a venous blood collection needle. Figure 1 .

[0024] Figure 5 A partial structural breakdown of a venous blood collection needle. Figure 2 .

[0025] Figure 6 for Figure 2 Enlarged schematic diagram of the structure at point A in the middle.

[0026] Figure 7 for Figure 3 Enlarged schematic diagram of the structure at point B.

[0027] In the diagram: 1. Blood collection needle body; 11. Blood collection needle tip; 12. Blood collection needle tip seat; 13. Blood collection needle wing; 14. Mounting cavity; 15. Guide groove; 2. Injection needle body; 21. Injection needle tip; 22. Injection needle tip seat; 23. Elastic pressing plate; 24. Pressing plate body; 25. Protrusion; 26. Disposable needle sheath; 27. Mounting groove; 3. Tube; 4. Anti-puncture mechanism; 5. First protective component; 51. First protective sleeve; 52. Elastic... 53. Sex limiting component; 54. First fixing component; 55. Moving plate; 56. Limiting plate; 57. Elastic limiting block; 58. Elastic fixing block; 6. Clearance hole; 6. Second protection component; 61. Second protective sleeve; 62. Spring; 63. Positioning component; 64. Second fixing component; 641. Knob seat; 642. Fixing knob; 643. Fixing hole; 65. Positioning block; 66. Positioning groove; 67. Positioning cover; 7. Blood collection tube. Detailed Implementation

[0028] The present invention will be further described below through specific embodiments.

[0029] like Figures 1 to 7 As shown, this embodiment provides a puncture-proof venous blood collection needle for drawing blood from a patient into a blood collection tube 7, including a blood collection needle body 1, a blood injection needle body 2, a flexible tube 3, and a puncture-proof mechanism 4.

[0030] The blood collection needle body 1 is used to puncture a patient's vein, including a blood collection needle head 11 connected to one end of a tubing 3, a blood collection needle head seat 12 located at one end of the blood collection needle head 11, and a blood collection needle wing 13 located on one side of the blood collection needle head seat 12.

[0031] The injection needle body 2, connected to the blood collection tube 7, includes an injection needle tip 21 connected to the other end of the tubing 3, an injection needle tip seat 22 located at one end of the injection needle tip 21, and two elastic pressing tabs 23 located on the side of the injection needle tip seat 22 extending towards the tubing 3. When the two elastic pressing tabs 23 are pressed, the tubing 3 is compressed, thus cutting off the blood in the tubing 3 and preventing blood from continuing to enter the blood collection tube 7. This ensures that the blood volume collected in the blood collection tube 7 is in the correct ratio to the coagulant or anticoagulant in the blood collection tube 7, and prevents injection... When the blood collection needle 21 is separated from the blood collection tube 7, blood drips out and contaminates the hands of medical staff or the work surface; specifically, the elastic pressing pad 23 includes a pressing pad body 24 for easy pressing and a protrusion 25 set on the opposite surface of the pressing pad body 24 and the tube 3. When the two elastic pressing pads 23 press the tube 3, the two opposite protrusions 25 abut against each other; furthermore, both the blood collection needle 11 and the blood injection needle 21 are equipped with disposable needle sleeves 26 to prevent the blood collection needle 11 and the blood injection needle 21 from being contaminated before blood collection.

[0032] The anti-puncture mechanism 4 includes a first protective component 5 and a second protective component 6 respectively disposed on the blood collection needle holder 12 and the blood injection needle holder 22. After blood collection, the blood collection needle 11 is located inside the first protective component 5, and the blood injection needle 21 is located inside the second protective component 6. The first protective component 5 and the second protective component 6 act as secondary needle sheaths for the used blood collection needle 11 and blood injection needle 21, respectively, which can protect patients and medical staff from being pricked and improve the safety of intravenous blood collection needles. Specifically, the first protective component 5 includes a first protective sleeve 51 movably disposed inside the blood collection needle holder 12 and a front-to-back arrangement on the outside of the blood collection needle holder 12 to restrict the first protective sleeve 51 to the blood collection needle holder 12. Two elastic limiting components 52 near one end of the tubing 3 and a first fixing component 53 disposed between the first protective sleeve 51 and the blood collection needle holder 12. When the first protective sleeve 51 is disengaged from the two elastic limiting components 52, the blood collection needle 11 is located inside the first protective sleeve 51. Before use, the first protective sleeve 51 is restricted between the two elastic limiting components 52 and located on the side of the blood collection needle holder 12 away from the blood collection needle 11, without affecting the normal use of the blood collection needle 11. Furthermore, the first protective sleeve 51 includes a movable plate 54 extending outward on one side and a limiting plate 55 disposed on the surface of the movable plate 54 opposite to the tubing 3. The blood collection needle holder 12 includes a mounting cavity 1 formed therein for mounting the first protective sleeve 51. 4. A guide groove 15 extending inward along its length and communicating with the mounting cavity 14 allows the movable plate 54 to move back and forth. The front and rear sides of the limiting plate 55 can contact the two elastic limiting components 52. Further, the elastic limiting component 52 includes two elastic limiting blocks 56 respectively disposed on both sides of the opening of the guide groove 15 and opposite to one side of the limiting plate 55. When the movable plate 54 is pulled forcefully towards the blood collection needle 11, one side of the limiting plate 55 and the two opposing elastic limiting blocks 56 deform, and the limiting plate 55 disengages from the two elastic limiting blocks 56. The first protective sleeve 51 is made of plastic material, and the limiting plate 55 will deform under force. Further, after use, the first protective sleeve 51 is pulled by hand while holding the movable plate 54. As the moving plate 55 moves towards the blood collection needle 11, it passes the two elastic limiting blocks 56 located in front of the moving plate 54. The limiting plate 55 presses down on the two elastic limiting blocks 56, and the limiting plate 55 and the two elastic limiting blocks 56 interact and deform. The bottom of the limiting plate 55 slides over the top of the two elastic limiting blocks 56, thereby moving towards the blood collection needle 11. Furthermore, the first fixing component 53 includes two elastic fixing blocks 57 that are relatively disposed on both sides of the guide groove 15 opening near the blood collection needle 11, allowing the moving plate 54 to pass through, and a clearance hole 58 disposed on the moving plate 54 that cooperates with the two elastic fixing blocks 57. When the two elastic fixing blocks 57 are located in the clearance hole 58, the first protective sleeve 51 is fixedly located on the outside of the blood collection needle 11.When the moving plate 54 passes the two elastic fixing blocks 57, the two elastic fixing blocks 57 engage with the clearance hole 58, thereby fixing the first protective sleeve 51 to the outside of the blood collection needle 11, preventing the blood collection needle 11 from puncturing medical staff or breaking the medical waste bag during recycling.

[0033] The second protective component 6 includes a second protective sleeve 61 movably disposed within the needle holder 22; a spring 62 detachably disposed within the needle holder 22, one end of which abuts against the end of the second protective sleeve 61 and the other end of which abuts against the interior of the needle holder 22; a positioning component 63 disposed between the second protective sleeve 61 and the needle holder 22 to prevent the second protective sleeve 61 from rotating; and a second fixing component 64 disposed between the needle holder 22 and the second protective sleeve 61 to prevent the second protective sleeve 61 from retracting into the needle holder 22; wherein the needle holder 22 includes a component formed therein for securing... The mounting groove 27 houses the second protective sleeve 61 and the spring 62. When connecting the blood collection tube 7, the injection needle 21 is inserted into the blood collection tube 7, the second protective sleeve 61 abuts against the blood collection tube 7, and the second protective sleeve 61 retracts into the mounting groove 27. The spring 62 in the mounting groove 27 is also compressed. When replacing the blood collection tube 7, the injection needle 21 is pulled out from the original blood collection tube 7, and the second protective sleeve 61 automatically extends under the action of the spring 62, covering the injection needle 21 inside, which can prevent needle stick injuries to medical personnel during the connection or disconnection of the blood collection tube 7. Specifically, the positioning component 63 includes a phase The second protective sleeve 61 is provided with two positioning blocks 65 on the outside of the second protective sleeve 61, two positioning grooves 66 extending outward from both sides of the injection needle holder 22 and opposite to the two positioning blocks 65, and a positioning cover 67 threadedly connected to the end of the injection needle holder 22 to prevent the positioning blocks 65 from sliding out of the corresponding positioning grooves 66; through the cooperation of the two positioning blocks 65, the two positioning grooves 66 and the positioning cover 67, the rotation of the second protective sleeve 61 in the mounting groove 27 is restricted, so that the second protective sleeve 61 can only move back and forth in the mounting groove 27; furthermore, the second fixing component 64 includes two positioning blocks 65 extending outward from one side of the injection needle holder 22 and opposite to the mounting groove 66. The groove 27 connects to a knob seat 641, a fixed knob 642 movably disposed within the knob seat 641, and a fixing hole 643 disposed on the second protective sleeve 61 that mates with the fixed knob 642. Before use, the fixed knob 642 is connected to the knob seat 641 but not to the fixing hole 643. At this time, the second protective sleeve 61 is retractably disposed within the mounting groove 27. After use, the fixed knob 642 is screwed into the fixing hole 643. At this time, the second protective sleeve 61 is restricted within the mounting groove 27 and cannot be retracted, so that the blood injection needle 21 is always within the second protective sleeve 61 when it is retrieved.

[0034] The steps for using the intravenous blood collection needle in this application are as follows:

[0035] Step 1: First, remove the disposable needle sheath 26 from the blood collection needle 11, grasp the blood collection needle wing 13 with your hand and insert the blood collection needle 11 into the patient's blood vessel. Then, remove the disposable needle sheath 26 from the injection needle 21 and connect it to the blood collection tube 7. During the connection of the blood collection tube 7, the second protective sleeve 61 retracts into the injection needle seat 22 under the action of the blood collection tube 7. At this time, the injection needle 21 is inserted into the blood collection tube 7 to collect blood.

[0036] Step 2: When the blood volume in the blood collection tube 7 reaches the required amount, press the two elastic pressing plates 23 so that the two protrusions 25 press against the tube 3, thereby cutting off the blood in the tube 3. Then pull out the injection needle 21. At this time, no blood flows out of the injection needle 21. Then insert the injection needle 21 into the new blood collection tube 7 to collect the second tube of blood.

[0037] Step 3: After blood collection is completed, first separate the injection needle 21 from the blood collection tube 7. After the injection needle 21 is pulled out of the blood collection tube 7, the second protective sleeve 61 automatically extends under the action of the spring 62, and the injection needle 21 is covered inside the second protective sleeve 61. Then pull out the blood collection needle 11, and then forcefully move the first protective sleeve 51 to fix it on the outside of the blood collection needle 11. At this time, the blood collection needle 11 and the injection needle 21 are covered respectively, which is convenient for recycling and can effectively prevent the needle from pricking medical staff.

[0038] In summary, by utilizing the above-mentioned technical solution of this utility model, and by defining the specific structure of the injection needle body 2, the injection needle body 2, through the mutual cooperation between the injection needle tip 21, the injection needle tip seat 22, and the two elastic pressing plates 23 that are respectively disposed on the side of the injection needle tip seat 22 and extend towards the tubing 3, can cut off the blood in the tubing 3, preventing blood from continuing to enter the blood collection tube 7. This ensures that the blood volume collected in the blood collection tube 7 is in the correct ratio to the coagulant or anticoagulant in the blood collection tube 7. Furthermore, it can prevent blood from dripping from the injection needle tip 21, which is separated from the blood collection tube 7, and contaminating the hands of medical personnel or the work surface. In addition, by defining the specific structure of the anti-puncture mechanism 4, and by adding a first protective component 5 and a second protective component 6 to the blood collection needle tip 11 and the injection needle tip 21, it can protect patients and medical personnel from being punctured, improving the safety of the venous blood collection needle. Furthermore, by using the first fixing component 53 disposed between the first protective sleeve 51 and the blood collection needle tip seat 12, the first protective sleeve can be fixed. The first protective sleeve 51 is fixed to the outside of the blood collection needle 11 to prevent the blood collection needle 11 from puncturing medical staff or medical waste bags during retrieval. In addition, the two elastic limiting components 52, which are arranged opposite each other on the outside of the blood collection needle holder 12, can limit the movement of the first protective sleeve 51 and not affect the normal use of the blood collection needle 11. Furthermore, the second protective sleeve 61, which is movably arranged in the blood injection needle holder 22, the spring 62, which is detachably arranged in the blood injection needle holder 22, and the positioning component 63 arranged between the second protective sleeve 61 and the blood injection needle holder 22 cooperate to make the second protective sleeve 61 automatically extend out of the blood injection needle holder 22, which can prevent medical staff from being pricked during the connection or disconnection of the blood collection tube 7. In addition, the second fixing component 64 arranged between the blood injection needle holder 22 and the second protective sleeve 61 can prevent the second protective sleeve 61 from retracting into the blood injection needle holder 22, so that the blood injection needle 21 is always inside the second protective sleeve 61 during retrieval.

[0039] The above description is merely a preferred embodiment of the present utility model, and therefore cannot be construed as limiting the scope of the present utility model. All equivalent changes and modifications made in accordance with the scope of the present utility model application and the contents of the specification should still fall within the scope of the present utility model application.

Claims

1. A puncture-resistant intravenous blood collection needle for drawing blood from a patient into a blood collection tube, characterized in that: The device includes a blood collection needle body, a blood injection needle body, a tubing, and a puncture prevention mechanism. The blood collection needle body is used to puncture a patient's vein and includes a blood collection needle head connected to one end of the tubing, a blood collection needle head seat located at one end of the blood collection needle head, and a blood collection needle wing located on one side of the blood collection needle head seat. The blood injection needle body includes a blood injection needle head connected to the other end of the tubing, a blood injection needle head seat located at one end of the blood injection needle head, and two elastic pressing pads located opposite each other on the side of the blood injection needle head seat extending towards the tubing. When the two elastic pressing pads are pressed, the tubing is pressed down. The puncture prevention mechanism includes a first protective component and a second protective component respectively located on the blood collection needle head seat and the blood injection needle head seat. After blood collection is completed, the blood collection needle head is located in the first protective component, and the blood injection needle head is located in the second protective component.

2. The anti-stick blood taking needle according to claim 1, wherein: The first protective component includes a first protective sleeve movably disposed within the blood collection needle holder, two elastic limiting components disposed opposite to each other on the outside of the blood collection needle holder to restrict the first protective sleeve on the blood collection needle holder near the end of the tubing, and a first fixing component disposed between the first protective sleeve and the blood collection needle holder. When the first protective sleeve is disengaged from between the two elastic limiting components, the blood collection needle is located within the first protective sleeve.

3. The anti-stick blood lancet according to claim 2, wherein: The first protective sleeve includes a movable plate extending outward on one side thereon and a limiting plate disposed on the surface of the movable plate opposite to the tubing. The blood collection needle holder includes an installation cavity formed therein for installing the first protective sleeve and a guide groove extending inward along its length and communicating with the installation cavity to allow the movable plate to move back and forth. The front and rear sides of the limiting plate can contact two elastic limiting components.

4. The anti-stick blood lancet according to claim 3, wherein: The elastic limiting component includes two elastic limiting blocks respectively disposed on both sides of the guide groove opening and opposite one side of the limiting plate. When the moving plate is pulled forcefully towards the blood collection needle, one side of the limiting plate and the two opposite elastic limiting blocks are deformed, and the limiting plate disengages from the two elastic limiting blocks.

5. The anti-stick blood lancet according to claim 3, wherein: The first fixing component includes two elastic fixing blocks disposed opposite to each other on both sides of the guide groove opening near the blood collection needle head, through which the movable plate can pass, and a clearance hole disposed on the movable plate that cooperates with the two elastic fixing blocks. When the two elastic fixing blocks are located in the clearance hole, the first protective sleeve is fixedly located on the outside of the blood collection needle head.

6. The lancing device of claim 1, wherein: The second protective component includes a second protective sleeve movably disposed within the needle holder, a spring detachably disposed within the needle holder with one end abutting against the end of the second protective sleeve and the other end abutting against the interior of the needle holder, a positioning component disposed between the second protective sleeve and the needle holder to prevent the second protective sleeve from rotating, and a second fixing component disposed between the needle holder and the second protective sleeve to prevent the second protective sleeve from retracting into the needle holder.

7. The lancing device of claim 6, wherein: The injection needle holder includes an installation groove formed therein for installing a second protective sleeve and a spring. The positioning assembly includes two positioning blocks disposed opposite to each other on the outside of the second protective sleeve, two positioning grooves respectively disposed on both sides of the injection needle holder extending outward and opposite to the two positioning blocks, and a positioning cover threadedly connected to the end of the injection needle holder to prevent the positioning blocks from sliding out of the opposite positioning groove.

8. The lancing device of claim 7, wherein: The second fixing component includes a knob seat extending outward from one side of the blood injection needle holder and communicating with the mounting groove, a fixing knob movably disposed within the knob seat, and a fixing hole disposed on the second protective sleeve that can cooperate with the fixing knob.

9. The lancing device of claim 1, wherein: The elastic pressing pad includes a pressing pad body that is easy to press by hand and a protrusion block disposed on the surface of the pressing pad body opposite to the hose. When the two elastic pressing pads press the hose, the two opposite protrusion blocks abut against each other.

10. The lancing device of claim 1, wherein: Both the blood collection needle and the blood injection needle are equipped with disposable needle sleeves.

Images