Device for adjusting penetration depth of blood sampling needle of blood sampling pen

Abstract

The invention discloses a blood sampling needle penetration depth adjusting device of a blood sampling pen, the blood sampling pen comprises a shell, a needle fixing piece capable of moving along the axis of the shell is arranged in the shell and used for fixing a blood sampling needle, the blood sampling needle penetration depth adjusting device of the blood sampling pen comprises a depth adjusting unit, and the depth adjusting unit comprises a second adjusting sleeve; the second adjusting sleeve is rotatably arranged at the tail end of the shell, and limiting steps with different heights are arranged on the inner wall of the second adjusting sleeve in a circumferential array mode. A rib plate is arranged on the side wall of the needle fixing piece, and when the needle fixing piece is released, the rib plate can make contact with the limiting step of a certain height. After the needle fixing piece is released once, the rib plate makes contact with the limiting step of a certain height, but the blood taking needle does not puncture the skin to achieve blood taking, at the moment, the blood taking needle needs to be in gear again, the second adjusting sleeve is rotated to enable the lower limiting step to correspond to the rib plate, then the needle fixing piece is released again, and the skin can be punctured by the blood taking needle. And the puncture depth of the blood taking needle can be adjusted more simply and conveniently.

Description

[0001] This application is a divisional application of the Chinese patent application with application number 2023108963139, application date July 19, 2023, and invention name “Blood collection needle, blood collection pen body for preventing accidental triggering of blood collection needle, blood collection pen and method of using blood collection pen”. Technical Field

[0002] The present disclosure relates to the technical field of lancing pens, and in particular to a device for adjusting the penetration depth of a lancet of a lancing pen. Background Art

[0003] The lancing pen is a medical device that is used in conjunction with a lancet to collect a small amount of peripheral blood from the fingertip or arm. In the prior art, when using most lancing pens, the front cap of the lancing pen is first removed, and then the lancing needle is inserted into the core needle slot of the lancing pen, and then the adjustment cap is installed to adjust the puncture depth; the pen barrel is pulled back to load the pen, and the end of the lancing pen cap is pressed on the appropriate part of the finger or arm, and a button is pressed to eject blood. After the blood collection is completed, the pen cap is unscrewed, and the lancing needle needs to be directly removed and discarded by hand. In the prior art, each blood collection requires multiple removal and re-installation of the blood collection pen cap, which is complex. In addition, the depth adjustment mechanism of the blood collection pen cap has many parts, and the assembly is complex, time-consuming, and costly. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a depth adjustment mechanism that is simple to assemble and has low cost.

[0005] In a first aspect, the present application provides a blood collection needle penetration depth adjustment device for a lancing device, the lancing device comprising a housing, a needle fixing member movable along its axis disposed within the housing, the needle fixing member being used to fix the lancing needle, the lancing needle penetration depth adjustment device comprising: A depth adjustment unit, comprising a second adjustment sleeve rotatably disposed at the end of the housing, wherein an inner wall of the second adjustment sleeve is provided with limiting steps of different heights along a circumferential array; A rib is provided on the side wall of the needle fixing member, and the rib is used to contact the limiting step at a certain height when the needle fixing member is released.

[0006] According to the technical solution provided in the embodiment of the present application, an adjustment gear platform is provided on the inner wall of the second adjustment sleeve, and a plurality of limiting step groups are provided along a circumferential array at the end of the adjustment gear platform, and the limiting step group includes limiting steps of different heights arranged along the circumferential direction.

[0007] According to the technical solution provided in the embodiment of the present application, the depth adjustment unit also includes a second fixed sleeve, the second fixed sleeve and the second adjustment sleeve are rotatably connected, the inner wall of the second adjustment sleeve is provided with a sliding groove along the circumferential direction, and the side wall of the second fixed sleeve is provided with a sliding protrusion adapted to the sliding groove, and the sliding protrusion and the sliding groove are slidably connected; the sliding cooperation between the sliding protrusion and the sliding groove enables the rib plate to correspond to different limiting steps.

[0008] According to the technical solution provided in the embodiment of the present application, a guide cylinder is provided on the outer cover of the needle fixing member, and the guide cylinder is used to provide guidance when the needle fixing member moves. The second fixing sleeve is fixed to the end of the guide cylinder.

[0009] According to the technical solution provided in the embodiment of the present application, a second adjustment protrusion is fixed to the side wall of the second fixed sleeve, and a plurality of second adjustment grooves are evenly opened on the inner wall of the second adjustment sleeve along the circumferential direction. The second adjustment protrusion and the second adjustment groove are adapted to each other, and the second adjustment groove and the limiting step are arranged corresponding to each other.

[0010] In summary, the present technical solution specifically discloses a blood collection needle penetration depth adjustment device for a lancing device, the lancing device comprising a housing, a needle fixing member movable along its axis disposed inside the housing for fixing the lancing needle, the lancing needle penetration depth adjustment device comprising a depth adjustment unit, comprising a second adjustment sleeve rotatably disposed at the end of the housing, and having an inner wall of the second adjustment sleeve provided with limiting steps of different heights along a circumferential array; a rib plate disposed on a side wall of the needle fixing member, which can contact a limiting step of a certain height when the needle fixing member is released; Therefore, when the needle fixing part is released once, its upper rib plate contacts a limit step of a certain height, but the lancet does not pierce the skin to achieve blood collection. At this time, the lancet needs to be re-engaged and the second adjustment sleeve is rotated to make the limit step with a lower height correspond to the rib plate. Then the needle fixing part is released again to enable the lancet to pierce the skin. The depth adjustment unit of the present application makes it easier to adjust the puncture depth of the lancet, and adapts to people with different skin thicknesses through limit steps of different heights. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 is a three-dimensional diagram of the blood collection needle of the present invention; Figure 2 is a three-dimensional diagram of the lancing device of the present invention; Figure 3 This is a schematic diagram of the internal structure of the lancing pen body of the present invention for preventing the lancing needle from being accidentally triggered; Figure 4 This is a schematic diagram of the internal structure of the lancing pen body of the present invention for preventing the lancet from being accidentally triggered, from another perspective; Figure 5 It is a three-dimensional diagram of the button of the present invention; Figure 6 is an exploded view of the needle fixing member and the guide cylinder of the present invention; Figure 7 This is a schematic diagram of the assembly state of the needle fixing member, the guide cylinder and the button in the first embodiment of the present invention; Figure 8 This is a schematic diagram of the assembly state of the needle fixing member, the guide cylinder and the button in the second embodiment of the present invention; Figure 9 This is a schematic diagram of the assembly state of the guide cylinder, the stopper and the needle fixing member in the second embodiment of the present invention; Figure 10 is a perspective view of the second adjustment sleeve of the present invention; Figure 11 is a cross-sectional view of a needle holder of the present invention; In the figure, 1, housing; 2. Needle fixing member; 21. Positioning seat; 22. Notch; 23. Snap-fit ​​protrusion; 24. Spring piece; 25. Wedge; 26. Stopper; 27. Shifting block; 28. Positioning hook; 29. ​​Rib plate; 210. Anti-rotation block; 211. First gear block; 3. a first elastic member; 4. Blood collection needle; 41. Sampling needle; 42. Needle holder; 43. Needle cap; 44. Groove; 5. Firing key; 51. Firing block; 52. Flange; 53. Limit baffle; 6. Needle withdrawal unit; 61. Button; 62. Push rod; 63. Third elastic member; 64. Stop portion; 65. Second side arm; 66. Anti-rotation groove; 67. Guide portion; 7. a second elastic member; 8. Guide cylinder; 81. Slide groove; 82. Second gear position bump; 83. Gear position elastic plate; 9. Depth adjustment unit; 91. Second fixing sleeve; 92. Second adjustment sleeve; 93. Second adjustment slot; 94. Second adjustment protrusion; 95. Shift adjustment platform; 96. Limiting step. DETAILED DESCRIPTION

[0012] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the relevant invention and are not intended to limit the invention. It should also be noted that, for ease of description, only portions relevant to the invention are shown in the accompanying drawings.

[0013] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0014] Example 1: The present invention will be described in detail below with reference to the accompanying drawings. Figure 1 and Figure 3 As shown, the lancet 4 comprises a sampling needle 41 and a needle holder 42. The needle holder 42 is fixedly connected to the sampling needle 41. The outer wall of the needle holder 42 is provided with a groove 44 along the circumference for positioning the needle when it is installed. The groove 44 is used to adapt to the lancing pen body when the lancet 4 is installed, and the lancet 4 is positioned to prevent the lancet 4 from falling out.

[0015] The blood collection needle 4 also includes a needle cap 43, and the needle cap 43 is fixed to the end of the needle seat 42. The needle seat 42 and the needle cap 43 are integrally formed. The diameter of the connection between the needle cap 43 and the needle seat 42 is smaller than the diameter of the needle seat 42. Before blood collection, the needle cap 43 is screwed, and the connection between the needle cap 43 and the needle seat 42 is easily damaged and broken due to its small diameter. The sampling needle 41 is exposed from the needle seat 42 but has not yet leaked out of the shell 1.

[0016] The diameter of the needle seat 42 is 4 mm to 10 mm. The diameter of the needle seat 42 is made thinner so that the blood collection needle 4 can be installed inside the blood collection pen body.

[0017] Prevent the lancet from accidentally triggering the lancet, such as Figure 2-Figure 4 As shown, it includes a shell 1, which plays the role of protecting internal parts and supporting various components.

[0018] The needle fixing part 2 is arranged inside the shell 1 and can be axially moved along the shell 1. It can be axially locked at a predetermined position. The end of the needle fixing part 2 has a positioning seat 21 for accommodating the blood collection needle 4; the needle fixing part 2 is used to fix the blood collection needle 4. When the blood collection needle 4 is installed, it moves along the shell 1 to achieve gear engagement; when firing, the blood collection needle 4 can be carried out of the shell 1 to pierce the skin to achieve sampling.

[0019] The firing button 5 is provided on the side wall of the housing 1 and can release the needle fixing member 2 axially; it is used to trigger the needle fixing member 2 and the sampling unit to move along the axial direction of the housing 1 .

[0020] The first elastic member 3 is sleeved on the outside of the needle holder 2. When the needle holder 2 is axially locked, it is compressed and stores energy. When the needle holder 2 is released, it drives the needle holder 2 out of the housing 1. The first elastic member 3 is compressed and stores energy during the gear shift process, and releases energy when the lancet 4 is fired.

[0021] The needle removal unit 6 includes a button 61 and a push rod 62. The button 61 is fixedly connected to the push rod 62, which is used to drive the lancet 4 out of the needle holder 2. Since the lancet 4 is a disposable device, after sampling, the button 61 is pressed, and the push rod 62, which is fixed to the button 61, pushes the lancet 4 out of the needle holder 2.

[0022] like Figure 3 and Figure 5 As shown, a spring plate 24 is fixed to the side wall of the needle holder 2. When uncompressed, the spring plate 24 is tilted outward. The portion of the trigger button 5 that extends into the housing 1 includes a trigger block 51. When gear is engaged, the trigger block 51 and the spring plate 24 come into contact with each other. The end of the spring plate 24 has a stepped structure. When gear is engaged, this stepped structure overlaps with the inner protrusion of the guide tube 8. When these two overlap, the needle holder 2 is axially locked in a predetermined position. The spring plate 24 is a resilient sheet-like structure. During gear engagement, as the needle holder 2 moves along the housing 1, the spring plate 24 gradually expands, compressing the trigger button 5 and causing it to spring upward. Because the portion of the trigger button 5 that extends into the housing 1 has a flange 52 extending outward, and a stopper 53 extending outward from the end of the trigger button 5 prevents the trigger button 5 from disengaging from the housing 1, a gap is provided around the trigger button 5 to allow it to move away from the housing 1. The firing key 5 is ejected and engaged simultaneously, and the firing key 5 is also in a ready state during the engagement. During firing, the needle holder 2 moves toward the direction of the sampling needle 41 outlet, the shrapnel 24 is compressed again, and the firing key 5 falls in height.

[0023] like Figure 3As shown, the end of the needle fixing member 2 has a limiting hook 28, and the outer sleeve of the needle fixing member 2 is provided with a second elastic member 7. The second elastic member 7 is used to retract the needle fixing member 2 into the housing 1 after firing. One end of the second elastic member 7 is abutted against the limiting hook 28, and the other end of the second elastic member 7 is abutted against the guide cylinder 8. The first elastic member 3 and the second elastic member 7 are coaxially arranged, and the first elastic member 3 is arranged at one end close to the firing button 5, and the second elastic member 7 is arranged at one end close to the needle withdrawal unit 6. The end of the spring clip 24 has a stepped structure. When engaged, this stepped structure overlaps the inner convex portion of the guide tube 8, restricting the movement of the spring clip 24 and the needle holder 2. The firing button 5 contacts the spring clip 24 on the needle holder 2, simultaneously extending the second elastic member 7 and compressing the first elastic member 3. When the firing button 5 is pressed, the spring clip 24 elastically deforms, releasing the restraint between the stepped structure at the end of the spring clip 24 and the guide tube 8. The first elastic member 3 extends, the second elastic member 7 compresses, and the needle holder 2 moves toward the exit of the sampling needle 41. The blood collection needle 4 extends a certain distance outside the housing 1, piercing the skin to obtain a blood sample. During firing, the first elastic member 3 releases energy and extends, while the second elastic member 7 compresses. After firing, the second elastic member 7 releases energy and extends, causing the blood collection needle 4 to retract from the outside of the housing 1 back into the inside of the housing 1.

[0024] like Figure 6 and Figure 7 As shown, in order to avoid the button 61 being accidentally triggered during the gear shifting process and causing the blood collection needle 4 to be pushed out, the side wall of the needle fixing member 2 is fixed with a first gear protrusion 211, and the guide cylinder 8 is fixed with a gear elastic plate 83, and the gear elastic plate 83 is fixed with a second gear protrusion 82. The first gear protrusion 211 can push the gear elastic plate 83 outward, and the button 61 or the push rod 62 is fixed with a second side arm 67, and the second side arm 67 has a gear portion 64. The ejection of the gear elastic plate 83 can make the second gear protrusion 82 overlap with the axial projection of the gear portion 64 to block the axial movement of the button 61. In this embodiment, the stopper portion 64 is a groove-shaped structure, but the stopper portion 64 can also be a block-shaped structure. During the movement of the needle holder 2 along the housing 1, when the first stopper protrusion 211 extends between the second stopper protrusion 82 and the guide cylinder 8 and contacts the second stopper protrusion 82, the second stopper protrusion 82 is located within the stopper portion 64, preventing the lancet 4 from being ejected by pressing the button 61. When the first stopper protrusion 211 and the second stopper protrusion 82 are not in contact, the stopper elastic plate 83 moves toward the side wall of the guide cylinder 8, thereby offsetting the second stopper protrusion 82 from the stopper portion 64.

[0025] Since the skin thickness of different people is different, if the sampling needle 41 cannot penetrate the skin after being fired by the firing key 5, sampling cannot be achieved. The length of the blood collection needle 4 extending out of the housing 1 can be adjusted by the depth adjustment unit 9. like Figure 3 、 Figure 8 and Figure 10 As shown, the depth adjustment unit 9 comprises a second fixing sleeve 91 and a second adjustment sleeve 92. The second fixing sleeve 91 is fixed to the end of the guide cylinder 8 and is rotatably connected to the second fixing sleeve 91. The second adjustment sleeve 92 includes a circumferential array of stop steps 96 at different heights. Preferably, the stop steps 96 at both ends of the circumference are of the same height. Ribs 29 extend symmetrically outward from the two side walls of the positioning seat 21. When the needle holder 2 is released, the ribs 29 contact the stop steps 96 at a certain height. A gear adjustment platform 95 is provided within the second adjustment sleeve 92. The end of the gear adjustment platform 95 is provided with a circumferential array of stop steps 96. Rotating the second adjustment sleeve 92 changes the relative position between the second adjustment sleeve 92 and the ribs 29. When the needle holder 2 is fired, the ribs 29 on the side of the needle holder 2 contact the stop steps 96, adjusting the extended length of the lancet 4 and thereby changing the depth of penetration of the lancet 4 into the skin at the sampling location.

[0026] A second adjustment protrusion 94 is fixed to the side wall of the second fixing sleeve 91, and a plurality of second adjustment slots 93 are formed on the side wall of the second adjustment sleeve 92. When the second adjustment sleeve 92 is rotated, the second adjustment protrusion 94 sequentially engages with different second adjustment slots 93. When the second adjustment sleeve 92 is rotated, the second adjustment protrusion 94 sequentially extends into different second adjustment slots 93. Each second adjustment slot 93 corresponds to the position of a rib 29 and a limit step 96. The second adjustment protrusion 94 and the second adjustment slot 93 enable depth adjustment to be achieved in a step-by-step manner.

[0027] If the skin is not punctured during the first sampling, the next sampling can be done by pulling the button 61. Figure 3 and Figure 7 As shown, a wedge 25 is fixed to the side wall of the needle holder 2, and a second side arm 65 is fixed to the button 61. This second side arm 65 drives the wedge 25 to move axially along the housing 1. The end of the wedge 25 extends into the groove of the shifting portion 64, allowing the wedge 25 to engage with the second side arm 65. A third elastic member 63 is mounted on the outer sleeve of the button 61, with the other end of the third elastic member 63 abutting against the housing 1. When the button 61 is pulled outward, the wedge 25 moves along with the second side arm 65 away from the outlet of the sampling needle 41, thereby driving the needle holder 2 to move. The first elastic member 3 is compressed, and the gear is engaged. The third elastic member 63 ensures that the needle holder 2 has sufficient firing stroke when the button 61 is pulled outward.

[0028] A fourth elastic member is fixed between the button 61 and the needle fixing member 2 for resetting the button 61. The first elastic member 3, the second elastic member 7, the third elastic member 63 and the fourth elastic member are all springs.

[0029] like Figure 7 As shown, after the gear is engaged, the fourth elastic member returns the button 61 to its original position. The side wall of the button 61 is provided with an anti-rotation groove 66, and the housing 1 is provided with an anti-rotation structure that matches the anti-rotation groove 66. The anti-rotation groove 66 and the anti-rotation structure cooperate to prevent the button 61 from rotating. The button 61 can only move axially and not rotate.

[0030] The present invention also discloses a blood collection pen, such as Figure 2 、 Figure 3 and Figure 11 As shown, the device comprises the aforementioned lancet body and lancet. A radially fixed engaging protrusion 23 is provided within the positioning seat 21, which engages with the groove 44 of the lancet. The end of the needle holder 42 can be inserted into the needle holder 2. The sidewall of the positioning seat 21 has a notch 22. The positioning seat 21 is made of a plastic material, such as plastic. When the needle holder 42 is inserted into the positioning seat 21, it inflates the positioning seat 21, causing a slight deformation. This allows the groove 44 on the needle holder 42 to engage with the engaging protrusion 23 on the positioning seat 21, securing the sampling unit 4. An anti-rotation block 210 is provided within the positioning seat 21, covering the needle holder 44 and restricting rotation of the lancet.

[0031] Example 2: This embodiment differs from the first embodiment in the structure for engaging the second gear. Specifically, the needle holder 2 is provided with a stopper 26 on its outer sleeve. A stopper protrusion 27 is fixed along the sidewall of the stopper 26. The button 61 is provided with a guide portion 67 that drives the stopper protrusion 27 to move axially along the housing 1. The guide portion 67 can be a groove-shaped structure. To engage the gear, the button 61 is pulled, and the stopper protrusion 27 engages with the guide portion 67. The stopper 26 moves with the movement of the second side arm 65, compressing the second elastic member 7, further driving the needle holder 2. Simultaneously, the first elastic member 3 is compressed, achieving the engagement. The third elastic member 63 ensures that the needle holder 2 has sufficient firing stroke when the button 61 is pulled outward.

[0032] How to use the lancing pen: S1: Installing the lancet 4 and engaging the gear: When the lancet 4 is installed in the lancing device, the lancet 4 first pushes the needle holder 2, causing the button 61 to move, and then the lancet 4 is inserted into the positioning seat 21. During this process, the needle holder 2 moves along the housing 1, the first elastic member 3 is compressed, and the needle holder 2 is axially locked. The positioning seat 21 has a notch 22 on its side, and the needle holder 42 extends into the positioning seat 21 so that the engaging protrusion 23 and the groove 44 fit together. At the same time, the needle holder 2 moves along the housing 1, and the first elastic member 3 is compressed. Specifically, the positioning seat 21 is made of a plastic material, such as plastic. When the needle holder 42 extends into the positioning seat 21, the positioning seat 21 is inflated, causing a slight deformation, thereby engaging the groove 44 on the needle holder 42 with the engaging protrusion 23 on the positioning seat 21, thereby securing the lancet 4. During the process of pushing the lancet 4 to secure it to the lancing device body, the first elastic member 3 is compressed and stores energy, axially locking the needle holder 2, and engaging the gear. Before blood collection, the needle cap 43 is screwed on. Due to its small diameter, the connection between the needle cap 43 and the needle seat 42 is easily damaged and breaks, and the sampling needle 41 is exposed from the needle seat 42 but has not leaked out of the housing 1. Before and after engaging the gear, there is no need to remove the cap at the end of the lancing pen and then install the blood collection component. Needle installation and engaging the gear can be performed simultaneously, shortening the preparation time.

[0033] In S1, the needle holder 2 moves along the housing 1, causing the first stop projection 211 to move until the stop spring plate 83 is pushed outward, causing the second stop projection 82 to overlap the stop portion 64 in the axial direction, thereby blocking the axial movement of the button 61. The needle holder 2 moves along the housing 1, causing the first stop projection 211 to move until it contacts the second stop projection 82. This allows the second stop projection 82 to restrict the overall movement of the button 61 if the button 61 is accidentally pressed after the gear is engaged, so that pressing the button 61 will not cause the lancet 4 to be withdrawn.

[0034] S2: Firing: Press the firing button 5 to release the needle holder 2. When the needle holder 2 is released, the blood collection needle 4 extends out of the housing 1. In S2.1, when the second adjusting sleeve 92 is rotated and the needle fixing member 2 is fired, the ribs 29 on both sides of the needle fixing member 2 come into contact with the limiting steps 96 at a certain height in the second adjusting sleeve 92.

[0035] After step S2.1, the following step S2.2 is performed: Pulling button 61 outward causes wedge 25 to move away from the outlet of lancet 4, compressing first elastic member 3 and axially locking needle holder 2. When button 61 is pulled outward, wedge 25 moves away from the outlet of sampling needle 41 along with second side arm 65, thereby moving needle holder 2 and compressing first elastic member 3, thus re-engaging the gear.

[0036] Alternatively, re-engaging the gear can be achieved by pulling the button 61 outward, which drives the engaging member 26 to move away from the outlet of the lancet 4, compressing the first elastic member 3 and axially locking the needle holder 2. When the button 61 is pulled outward, the engaging member 26 moves with the movement of the second side arm 65, squeezing the second elastic member 7, further driving the needle holder 2 to move, and simultaneously compressing the first elastic member 3, thus engaging the gear.

[0037] S3: Withdraw the needle: Press the button 61, and the push rod 62 pushes the blood collection needle 4 to separate it from the needle fixing member 2.

[0038] The above technical solutions only reflect the preferred technical solutions of the technical solutions of the present invention. Any changes that may be made to certain parts thereof by those skilled in the art all reflect the principles of the present invention and fall within the scope of protection of the present invention.

Claims

1. A blood collection needle penetration depth adjustment device for a blood collection device, characterized in that: The lancing pen comprises a housing (1), a needle fixing member (2) movable along its axis is provided inside the housing (1), the needle fixing member (2) is used to fix the lancing needle, and the lancing needle insertion depth adjustment device of the lancing pen comprises: A depth adjustment unit (9), the depth adjustment unit (9) comprising a second adjustment sleeve (92), the second adjustment sleeve (92) being rotatably disposed at the end of the housing (1), the inner wall of the second adjustment sleeve (92) being provided with limiting steps (96) of different heights along a circumferential array; A rib plate (29) is provided on the side wall of the needle fixing member (2), and when the needle fixing member (2) is released, the rib plate (29) is used to contact the limiting step (96) at a certain height.

2. The blood collection needle penetration depth adjustment device of a blood collection device according to claim 1, characterized in that: An adjusting gear platform (95) is provided on the inner wall of the second adjusting sleeve (92), and a plurality of limiting step groups are provided at the end of the adjusting gear platform (95) along a circumferential array, wherein the limiting step group includes the limiting steps (96) of different heights arranged along the circumferential direction.

3. The blood collection needle penetration depth adjustment device of a blood collection device according to claim 1, characterized in that: The depth adjustment unit (9) further comprises a second fixed sleeve (91), the second fixed sleeve (91) and the second adjustment sleeve (92) are rotatably connected, the inner wall of the second adjustment sleeve (92) is provided with a sliding groove along the circumferential direction, the side wall of the second fixed sleeve (91) is provided with a sliding protrusion adapted to the sliding groove, and the sliding protrusion and the sliding groove are slidably connected; the sliding cooperation between the sliding protrusion and the sliding groove enables the rib plate (29) to correspond to different limiting steps (96).

4. The blood collection needle penetration depth adjustment device of a blood collection device according to claim 3, characterized in that: The outer cover of the needle fixing member (2) is provided with a guide cylinder (8), and the guide cylinder (8) is used to provide guidance when the needle fixing member (2) moves. The second fixing sleeve (91) is fixed to the end of the guide cylinder (8).

5. The blood collection needle penetration depth adjustment device of a blood collection device according to claim 4, characterized in that: A second adjusting protrusion (94) is fixed to the side wall of the second fixing sleeve (91), and a plurality of second adjusting grooves (93) are evenly opened on the inner wall of the second adjusting sleeve (92) along the circumferential direction. The second adjusting protrusion (94) and the second adjusting groove (93) are adapted to each other, and the second adjusting groove (93) and the limiting step (96) are arranged corresponding to each other.

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