Intelligent positioning and auxiliary puncture device for venipuncture

Abstract

The invention provides an intelligent positioning and auxiliary puncture device for venipuncture, and relates to the technical field of medical instruments. The intelligent positioning and auxiliary puncture device for venipuncture comprises a base, a binding mechanism is arranged on one side of the base, a moving mechanism is installed on the other side of the base, the moving mechanism comprises a sliding shell fixed to the upper end of the base, a stand column is slidably connected to the sliding shell, a cross beam is slidably connected to the stand column, and the cross beam is fixedly connected to the base. A lifting seat capable of vertically sliding is installed on the cross beam, and one side of the lifting seat is connected with a fine adjustment mechanism. According to the device, accurate adjustment of the spatial position and angle of the needle head is achieved through cooperation of the moving mechanism and the fine adjustment mechanism, the skin is automatically tightened through the tightening mechanism to expose and fix the blood vessel, the needle inserting depth is accurately controlled through the limiting mechanism, and the device effectively solves the problems that the blood vessel slides and needle inserting is too deep; and the definition, the success rate and the operation safety of puncture positioning are obviously improved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to an intelligent positioning and assisted puncture device for intravenous puncture. Background Technology

[0002] Venipuncture is one of the most common nursing procedures in clinical medicine, widely used in intravenous infusions, blood collection, and drug injections. Currently, clinical venipuncture mainly relies on manual operation by healthcare professionals, and the success rate is significantly affected by factors such as the experience of the healthcare professionals and the patient's vascular condition (e.g., obesity, edema, arteriosclerosis). Especially in emergency rooms, pediatrics, or when dealing with patients with poor vascular conditions, repeated punctures not only increase patient suffering, but this manual operation method also has inherent limitations in terms of accuracy and stability.

[0003] Specifically, existing procedures often have several shortcomings: First, the needle insertion angle is difficult to control precisely. Traditional hand-held puncture is prone to puncturing the posterior wall of the blood vessel due to an excessively large angle, or causing the needle to travel too far under the skin due to an excessively small angle. Second, the needle insertion depth lacks mechanical limits and relies entirely on manual judgment, which can easily lead to punctures that are too deep or too shallow, increasing patient pain and medical risks. In addition, there is often a lack of effective means of skin tautness and blood vessel fixation during the puncture process, which makes the blood vessel prone to slippage and displacement, further reducing the success rate of puncture.

[0004] Therefore, those skilled in the art have provided an intelligent positioning and assisted puncture device for venipuncture to solve the problems mentioned in the background art. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an intelligent positioning and assisted puncture device for intravenous puncture, which solves the problems of difficulty in accurately controlling the needle insertion angle, lack of mechanical limitation on the needle insertion depth, and easy slippage of blood vessels during puncture.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A smart positioning and assisted puncture device for intravenous puncture includes a base, a restraint mechanism on one side of the base, and a moving mechanism on the other side of the base. The moving mechanism includes a sliding shell fixed to the upper end of the base, a column slidably connected to the sliding shell, a crossbeam slidably connected to the column, and a vertically sliding lifting seat installed on the crossbeam. A fine-tuning mechanism is connected to one side of the lifting seat, and a placement cylinder is installed inside the fine-tuning mechanism; The lower end of the placement tube is provided with a tensioning mechanism; The placement cylinder is equipped with a limiting mechanism inside; A distance sensor is provided on one side of the lower end of the placement tube; Through the above technical solution, the spatial position and angle of the needle can be precisely adjusted by the cooperation of the moving mechanism and the fine adjustment mechanism. The tensioning mechanism automatically tightens the skin to expose and fix the blood vessel, and the limiting mechanism precisely controls the needle insertion depth. This device effectively solves the problems of blood vessel slippage and excessive needle insertion, and significantly improves the clarity, success rate and safety of puncture positioning.

[0007] Furthermore, the restraint mechanism includes a placement seat fixed to one side of the upper end of the base, with restraint straps on both sides of the placement seat and sponge pressure blocks on the inner side of the restraint straps; The above technical solution, using the combination of restraint straps and sponge blocks, can flexibly fix the patient's arm, effectively preventing the patient from shaking their limb due to pain or fear during the puncture process, ensuring the stability and safety of the puncture operation, while the sponge blocks improve the patient's comfort.

[0008] Furthermore, the moving mechanism also includes a threaded rod rotatably installed inside the sliding housing, the threaded rod being driven by a servo motor installed outside the sliding housing, a threaded cylinder being threadedly connected to the threaded rod, the threaded cylinder being fixedly connected to the column, a servo motor being installed on one side of the upper end of the column, a gear being connected to the output end of the servo motor being fixedly connected to the crossbeam, a rack being fixedly connected to the crossbeam and meshing with the gear being fixedly connected to the crossbeam, a servo motor being installed on the crossbeam, a gear being connected to the output end of the servo motor being fixedly connected to the crossbeam, and a rack being fixedly connected to the lifting seat and meshing with the gear being fixedly connected to the lifting seat. Through the above technical solution, the longitudinal movement of the column is achieved by servo motor 1 driving threaded rod 1 in conjunction with threaded cylinder 1, the horizontal movement of the crossbeam is achieved by servo motor 2 in conjunction with gear 1 and rack 1, and the vertical movement of the lifting seat is achieved by servo motor 3 in conjunction with gear 2 and rack 2. This realizes the precise positioning of the puncture needle in three-dimensional space and significantly improves the device's adaptability to different puncture positions.

[0009] Furthermore, the fine-tuning mechanism includes a support frame rotatably connected to one side of the lifting seat via a rotating shaft one. A gear three is fixedly connected to the outside of the rotating shaft one. A servo motor four is installed on one side of the lifting seat. The output end of the servo motor four is connected to a gear four that meshes with the gear three. Rotating shaft two is fixedly connected to both sides of the outer wall of the placement cylinder. The placement cylinder is rotatably connected to the support frame via the rotating shaft two. A gear six is ​​fixedly connected to the outside of one of the rotating shaft two. A servo motor five is installed on the side wall of the support frame. The output end of the servo motor five is connected to a gear five that meshes with the gear six. Through the above technical solution, the support frame is rotated by a four-wheel drive gear set of a servo motor, and the placement cylinder is rotated by a five-wheel drive gear set of a servo motor. This enables the multi-angle tilting and rotation adjustment of the puncture needle, thereby allowing for precise adjustment of the needle insertion angle according to the patient's blood vessel direction and improving the matching degree between the puncture needle insertion angle and the blood vessel direction.

[0010] Furthermore, the tensioning mechanism includes a support shell fixed to the lower end of the outer side of the placement cylinder. A threaded rod 2 is rotatably connected to one side of the inner side of the support shell. The threaded rod 2 is driven by a servo motor 6 installed outside the support shell. Two threaded cylinders 2 are threadedly connected to the threaded rod 2. An arc-shaped pressure plate is fixedly connected to the lower end of each of the two threaded cylinders 2. Near-infrared light sources are installed on the opposite sidewalls of the two arc-shaped pressure plates. Through the above technical solution, the servo motor drives the threaded rod to move the two threaded cylinders in opposite directions, thereby controlling the two arc-shaped pressure plates to stretch the skin at the puncture site in the opposite direction. This achieves automatic skin tightening and exposure and fixation of blood vessels, effectively avoiding puncture failure caused by blood vessel slippage. At the same time, the setting of the near-infrared light source can enhance the imaging effect of blood vessels and significantly improve the clarity of blood vessel positioning.

[0011] Furthermore, guide rings are fixedly connected to one side of the upper end of both of the arc-shaped pressure plates, and a guide rod penetrating the guide rings is fixedly connected to one side of the inside of the support shell; The above technical solution provides guidance and support for the movement of the arc-shaped pressure plate through the sliding cooperation between the guide rod and the guide ring, ensuring the straightness and stability of the two arc-shaped pressure plates during their movement towards each other, and preventing them from shifting or shaking when stretching the skin.

[0012] Furthermore, the limiting mechanism includes a threaded rod three rotatably installed inside the placement cylinder, a threaded cylinder three threadedly connected to the threaded rod three, a limiting ring fixedly connected to one side of the threaded cylinder three, the top end of the threaded rod three penetrating the placement cylinder and fixedly connected to a rotating block, and the limiting ring sliding inside the placement cylinder. Through the above technical solution, the threaded engagement between the threaded rod three and the threaded cylinder three drives the limiting ring to slide inside the placement cylinder, allowing it to adjust the position of the limiting ring according to the depth of the patient's blood vessels. This achieves precise mechanical limiting of the puncture needle insertion depth, effectively avoiding damage to the posterior wall of the blood vessel or nerve tissue due to excessive needle insertion, and significantly improving the safety of the puncture operation.

[0013] Furthermore, corrugated plates are fixedly connected to both sides of the sliding shell, and the side of the corrugated plate away from the sliding shell is fixedly connected to the threaded cylinder. The above technical solution, by setting a corrugated plate, can protect the internal structure of the sliding shell from dust, preventing external dust or impurities from entering the interior and affecting the transmission accuracy. At the same time, the corrugated plate has a certain degree of flexibility, which does not affect the normal movement of the threaded cylinder.

[0014] This invention provides an intelligent positioning and assisted puncture device for intravenous puncture. It has the following beneficial effects: 1. This invention provides an intelligent positioning and assisted puncture device for intravenous puncture. The device uses servo motor 1, servo motor 2 and servo motor 3 inside the moving mechanism to drive threaded rod 1, gear 1 and gear 2 in conjunction with threaded cylinder 1, rack 1 and rack 2, so that the column, crossbeam and lifting seat can be driven to perform three-axis linkage, which realizes accurate and rapid positioning of the puncture needle in space, and significantly improves the device's adaptability and adjustment efficiency to different puncture positions.

[0015] 2. This invention provides an intelligent positioning and assisted puncture device for intravenous puncture. The device uses servo motors four and five inside the fine-tuning mechanism to drive gear sets on rotating shaft one and rotating shaft two respectively, so that the placement cylinder can be tilted and rotated at multiple angles. This achieves precise fine-tuning of the angle and posture of the puncture needle, significantly improves the matching degree between the puncture needle angle and the direction of the blood vessel, and reduces the difficulty of operation.

[0016] 3. This invention provides an intelligent positioning and assisted puncture device for venipuncture. The device uses a servo motor six inside the tensioning mechanism to drive the threaded rod two to move the two threaded cylinders two in opposite directions, which in turn controls the two arc-shaped pressure plates to stretch the skin at the puncture site in the opposite direction. This achieves automatic skin tensioning and exposure and fixation of blood vessels, effectively avoiding puncture failure caused by blood vessel slippage, and significantly improving the clarity of blood vessel positioning and puncture success rate.

[0017] 4. This invention provides an intelligent positioning and assisted puncture device for venipuncture. The device drives the limiting ring to slide inside the placement cylinder through the threaded engagement of the threaded rod three and the threaded cylinder three inside the limiting mechanism. This allows the limiting ring to adjust its position according to the depth of the patient's blood vessels, achieving precise mechanical limiting of the puncture needle insertion depth. This effectively avoids damage to the posterior wall of the blood vessel or nerve tissue due to excessive needle insertion, and significantly improves the safety of the puncture operation. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the restraint mechanism of the present invention; Figure 3 This is a schematic diagram of the unfolded moving mechanism of the present invention; Figure 4 This is a schematic diagram of the fine-tuning mechanism of the present invention; Figure 5 This is a schematic diagram of the unfolded fine-tuning mechanism of the present invention; Figure 6 This is a cross-sectional view of the fine-tuning mechanism of the present invention; Figure 7 This is a schematic diagram of the unfolded fine-tuning mechanism of the present invention; Figure 8 This is a schematic diagram of the limiting mechanism of the present invention.

[0019] Explanation of reference numerals in the attached figures: 1. Base; 2. Restraint Mechanism; 21. Placement Seat; 22. Restraint Strap; 23. Sponge Pressure Block; 3. Moving Mechanism; 31. Sliding Shell; 32. Threaded Rod I; 33. Servo Motor I; 34. Threaded Sleeve I; 35. Corrugated Plate; 36. Column; 37. Servo Motor II; 38. Gear I; 39. Crossbeam; 310. Rack I; 311. Servo Motor III; 312. Gear II; 313. Lifting Seat; 314. Rack II; 4. Fine Adjustment Mechanism; 41. Support Frame; 42. Rotating Shaft I; 43. 44. Gear 3; 45. Servo Motor 4; 46. Servo Motor 5; 47. Gear 5; 48. Placement Cylinder; 49. Rotating Shaft 2; 410. Gear 6; 5. Tensioning Mechanism; 51. Support Shell; 52. Threaded Rod 2; 53. Servo Motor 6; 54. Threaded Cylinder 2; 55. Arc-shaped Pressure Plate; 56. Guide Ring; 57. Guide Rod; 6. Near-Infrared Light Source; 7. Distance Sensor; 8. Limiting Mechanism; 81. Threaded Rod 3; 82. Threaded Cylinder 3; 83. Limiting Ring; 84. Rotating Block. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1:

[0021] like Figure 1-8 As shown, this embodiment of the invention provides an intelligent positioning and assisted puncture device for venipuncture, including a base 1, a restraint mechanism 2 on one side of the base 1, and a moving mechanism 3 installed on the other side of the base 1. The moving mechanism 3 includes a sliding shell 31 fixed to the upper end of the base 1, a column 36 slidably connected to the sliding shell 31, a crossbeam 39 slidably connected to the column 36, and a vertically sliding lifting seat 313 installed on the crossbeam 39. A fine-tuning mechanism 4 is connected to one side of the lifting seat 313, and a placement cylinder 48 is installed inside the fine-tuning mechanism 4; A tensioning mechanism 5 is provided at the lower end of the placement cylinder 48; The placement cylinder 48 is equipped with a limit mechanism 8 inside; A distance sensor 7 is provided on one side of the lower end of the placement cylinder 48; The device achieves precise adjustment of the needle's spatial position and angle through the cooperation of the moving mechanism 3 and the fine-tuning mechanism 4. The tensioning mechanism 5 automatically tightens the skin to expose and fix the blood vessel, and the limiting mechanism 8 precisely controls the needle insertion depth. This device effectively solves the problems of blood vessel slippage and excessive needle insertion, and significantly improves the clarity, success rate and safety of puncture positioning.

[0022] The restraint mechanism 2 includes a placement seat 21 fixed to one side of the upper end of the base 1. Restraint straps 22 are provided on both sides of the placement seat 21, and sponge pressure blocks 23 are provided inside the restraint straps 22. The combination of the restraint straps 22 and the sponge pressure blocks 23 allows for flexible fixation of the patient's arm, effectively preventing limb movement due to pain or fear during the puncture process, ensuring the stability and safety of the puncture operation. Simultaneously, the sponge pressure blocks 23 improve patient comfort. The moving mechanism 3 also includes a threaded rod 32 rotatably installed inside the sliding shell 31. The threaded rod 32 is driven by a servo motor 33 installed outside the sliding shell 31. A threaded cylinder 34 is threadedly connected to the threaded rod 32 and fixedly connected to the column 36. The upper end of the column 36... A servo motor 37 is installed on one side, and the output end of the servo motor 37 is connected to a gear 38. A rack 310 that meshes with the gear 38 is fixedly connected to the crossbeam 39. A servo motor 311 is installed on the crossbeam 39, and the output end of the servo motor 311 is connected to a gear 312. A rack 314 that meshes with the gear 312 is fixedly connected to the lifting seat 313. The servo motor 33 drives the threaded rod 32 to cooperate with the threaded cylinder 33 to achieve the longitudinal movement of the column 36. The servo motor 37, in cooperation with the gear 38 and rack 310, achieves the horizontal movement of the crossbeam 39. The servo motor 311, in cooperation with the gear 312 and rack 314, achieves the vertical movement of the lifting seat 313, thereby realizing the precise positioning of the puncture needle in three-dimensional space. The device's adaptability to different puncture positions is significantly improved. The fine-tuning mechanism 4 includes a support frame 41 rotatably connected to one side of the lifting seat 313 via a rotating shaft 42. A gear 43 is fixedly connected to the outside of the rotating shaft 42. A servo motor 44 is installed on one side of the lifting seat 313. The output end of the servo motor 44 is connected to a gear 45 that meshes with the gear 43. Rotating shafts 49 are fixedly connected to both sides of the outer wall of the placement cylinder 48. The placement cylinder 48 is rotatably connected to the support frame 41 via rotating shafts 49. A gear 410 is fixedly connected to the outside of one of the rotating shafts 49. A servo motor 46 is installed on the side wall of the support frame 41. The output end of the servo motor 46 is connected to a gear 47 that meshes with the gear 410. Servo motor 44 drives the gear set to rotate the support frame 41, and servo motor 5 drives the gear set to rotate the placement cylinder 48, realizing multi-angle tilt and rotation adjustment of the puncture needle. This allows for precise adjustment of the needle insertion angle according to the patient's blood vessel direction, improving the matching degree between the puncture needle insertion angle and the blood vessel direction. The tensioning mechanism 5 includes a support shell 51 fixed to the lower end of the placement cylinder 48. A threaded rod 52 is rotatably connected to one side of the inner side of the support shell 51. The threaded rod 52 is driven by servo motor 6 53 installed outside the support shell 51. Two threaded cylinders 54 are threadedly connected to the threaded rod 52. An arc-shaped pressure plate 55 is fixedly connected to the lower end of each of the two threaded cylinders 54. Near-infrared light sources 6 are installed on the opposite side walls of the two arc-shaped pressure plates 55.The servo motor 6 53 drives the threaded rod 2 52 to move the two threaded cylinders 2 54 towards each other, thereby controlling the two arc-shaped pressure plates 55 to stretch the skin at the puncture site in the opposite direction. This achieves automatic skin tightening and exposure and fixation of blood vessels, effectively avoiding puncture failure caused by blood vessel slippage. At the same time, the near-infrared light source 6 enhances the visualization effect of blood vessels and significantly improves the clarity of blood vessel positioning. Guide rings 56 are fixedly connected to one side of the upper end of each of the two arc-shaped pressure plates 55. A guide rod 57 passing through the guide ring 56 is fixedly connected to one side of the inner side of the support shell 51. Through the sliding cooperation between the guide rod 57 and the guide ring 56, the movement of the arc-shaped pressure plates 55 is provided with guiding support, ensuring the straightness and stability of the two arc-shaped pressure plates 55 during the process of moving towards each other, and preventing them from shifting or shaking when stretching the skin. The limiting mechanism 8 includes a threaded rod 3 81 rotatably installed inside the placement cylinder 48, and a threaded cylinder 3 is threadedly connected to the threaded rod 3 81. 82. A limiting ring 83 is fixedly connected to one side of the threaded cylinder 3. The top end of the threaded rod 3 81 passes through the placement cylinder 48 and is fixedly connected to a rotating block 84. The limiting ring 83 slides inside the placement cylinder 48. The threaded engagement between the threaded rod 3 81 and the threaded cylinder 3 82 drives the limiting ring 83 to slide inside the placement cylinder 48, allowing it to adjust its position according to the depth of the patient's blood vessels. This achieves precise mechanical limiting of the needle insertion depth, effectively preventing damage to the posterior wall of the blood vessel or nerve tissue due to excessive needle insertion, and significantly improving the safety of the puncture operation. Corrugated plates 35 are fixedly connected to both sides of the sliding shell 31. The side of the corrugated plate 35 away from the sliding shell 31 is fixedly connected to the threaded cylinder 1 34. By setting the corrugated plate 35, the internal structure of the sliding shell 31 can be dustproofed, preventing external dust or impurities from entering the interior and affecting the transmission accuracy. At the same time, the corrugated plate 35 has a certain degree of extensibility, which does not affect the normal movement of the threaded cylinder 1 34.

[0023] Working principle: In use, the patient's arm is first placed on the placement seat 21 at the upper end of the base 1, and the arm is fixed by the restraint mechanism 2. The sponge pressure block 23 on the inner side of the restraint strap 22 ensures a secure fixation while improving comfort and preventing limb movement during puncture. Then, the moving mechanism 3 is activated. Servo motor 1 33 drives the threaded rod 1 32 to rotate, which drives the column 36 to achieve longitudinal position adjustment through the threaded cylinder 1 34. Servo motor 2 37 drives gear 1 38 to mesh with rack 1 310, which drives the crossbeam 39 to move horizontally. Servo motor 3 311 drives gear 2 312 to mesh with rack 2 314, which drives the lifting seat 313 to move vertically. Through the three-axis linkage, the puncture needle is quickly delivered above the blood vessel to be punctured, achieving coarse positioning in space.

[0024] Next, precise adjustments are made through the fine-tuning mechanism 4. Servo motor 5 46 drives the gear set to rotate the placement cylinder 48, adjusting the tilt angle of the needle insertion. Servo motor 44 drives the gear set to rotate the support frame 41, adjusting the rotational posture of the needle insertion so that the needle angle matches the direction of the blood vessel. At the same time, the near-infrared light source 6 is turned on to irradiate the skin to clearly show the location of the blood vessels.

[0025] Before needle insertion, the tensioning mechanism 5 is activated. The servo motor 6 53 drives the threaded rod 2 52 to move the two threaded cylinders 2 54 in opposite directions, so that the two arc-shaped pressure plates 55 stretch the skin at the puncture site in the opposite direction, automatically tightening the skin and fixing the blood vessel to prevent the blood vessel from slipping.

[0026] After determining the angle and position, operate the limiting mechanism 8. Rotating the rotating block 84 drives the threaded rod 81 to rotate, which in turn drives the limiting ring 83 to slide within the placement cylinder 48 via the threaded cylinder 82. The position of the limiting ring 83 is precisely set according to the depth of the patient's blood vessels, thereby limiting the insertion depth of the puncture needle. Finally, the puncture operation is performed. When the needle hub touches the limiting ring 83, it automatically stops to ensure accurate needle insertion depth and avoid excessive depth that could damage the tissue.

[0027] The following points should be noted in this article: 1. The accompanying drawings of the embodiments disclosed herein only relate to the structures involved in the embodiments disclosed herein; other structures can be referred to in a general design.

[0028] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A venipuncture intelligent positioning and auxiliary puncture device, comprising a base (1), characterized in that: A restraint mechanism (2) is provided on one side of the base (1), and a moving mechanism (3) is installed on the other side of the base (1). The moving mechanism (3) includes a sliding shell (31) fixed to the upper end of the base (1), a column (36) is slidably connected to the sliding shell (31), a crossbeam (39) is slidably connected to the column (36), and a vertically sliding lifting seat (313) is installed on the crossbeam (39). A fine-tuning mechanism (4) is connected to one side of the lifting seat (313), and a placement cylinder (48) is installed inside the fine-tuning mechanism (4). The lower end of the placement tube (48) is provided with a tensioning mechanism (5); The placement tube (48) is provided with a limiting mechanism (8) inside; A distance sensor (7) is provided on one side of the lower end of the placement tube (48).

2. The intelligent positioning and auxiliary puncture device for venipuncture according to claim 1, characterized in that: The restraint mechanism (2) includes a placement seat (21) fixed to one side of the upper end of the base (1), and restraint straps (22) are provided on both sides of the placement seat (21), and sponge pressure blocks (23) are provided on the inner side of the restraint straps (22).

3. The intelligent positioning and auxiliary puncture device for venipuncture according to claim 1, characterized in that: The moving mechanism (3) further includes a threaded rod (32) rotatably installed inside the sliding shell (31). The threaded rod (32) is driven by a servo motor (33) installed outside the sliding shell (31). A threaded cylinder (34) is threadedly connected to the threaded rod (32). The threaded cylinder (34) is fixedly connected to the column (36). A servo motor (37) is installed on one side of the upper end of the column (36). A gear (38) is connected to the output end of the servo motor (37). A rack (310) meshing with the gear (38) is fixedly connected to the crossbeam (39). A servo motor (311) is installed on the crossbeam (39). A gear (312) is connected to the output end of the servo motor (311). A rack (314) meshing with the gear (312) is fixedly connected to the lifting seat (313).

4. The intelligent positioning and auxiliary puncture device for venipuncture according to claim 1, characterized in that: The fine-tuning mechanism (4) includes a support frame (41) rotatably connected to one side of the lifting seat (313) via a rotating shaft (42). A gear (43) is fixedly connected to the outside of the rotating shaft (42). A servo motor (44) is installed on one side of the lifting seat (313). A gear (45) meshing with the gear (43) is connected to the output end of the servo motor (44). Rotating shafts (49) are fixedly connected to both sides of the outer wall of the placement cylinder (48). The placement cylinder (48) is rotatably connected to the support frame (41) via rotating shafts (49). A gear (410) is fixedly connected to the outside of one of the rotating shafts (49). A servo motor (46) is installed on the side wall of the support frame (41). A gear (47) meshing with the gear (410) is connected to the output end of the servo motor (46).

5. The intelligent positioning and auxiliary puncture device for venipuncture according to claim 1, characterized in that: The tensioning mechanism (5) includes a support shell (51) fixed to the lower end of the outer side of the placement cylinder (48). A threaded rod (52) is rotatably connected to one side of the inner side of the support shell (51). The threaded rod (52) is driven by a servo motor (53) installed outside the support shell (51). Two threaded cylinders (54) are threadedly connected to the threaded rod (52). An arc-shaped pressure plate (55) is fixedly connected to the lower end of each of the two threaded cylinders (54). Near-infrared light sources (6) are installed on the opposite side walls of the two arc-shaped pressure plates (55).

6. The intelligent positioning and auxiliary puncture device for venipuncture according to claim 1, characterized in that: Guide rings (56) are fixedly connected to one side of the upper end of the two arc-shaped pressure plates (55), and guide rods (57) that pass through the guide rings (56) are fixedly connected to one side of the inner side of the support shell (51).

7. The intelligent positioning and auxiliary puncture device for venipuncture according to claim 1, characterized in that: The limiting mechanism (8) includes a threaded rod three (81) rotatably installed inside the placement cylinder (48), a threaded cylinder three (82) threadedly connected to the threaded rod three (81), a limiting ring (83) fixedly connected to one side of the threaded cylinder three (82), a rotating block (84) fixedly connected to the top end of the threaded rod three (81) through the placement cylinder (48), and the limiting ring (83) slides inside the placement cylinder (48).

8. The intelligent positioning and auxiliary puncture device for venipuncture according to claim 1, characterized in that: Corrugated plates (35) are fixedly connected to both sides of the sliding shell (31), and the side of the corrugated plate (35) away from the sliding shell (31) is fixedly connected to the threaded cylinder (34).

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