Venipuncture fixing guider with locking function

Abstract

The invention relates to the technical field of medical auxiliary instruments, and discloses a venipuncture fixing guider with a locking function, which comprises a fixing assembly, the fixing assembly comprises a bearing plate, the top of the bearing plate is provided with an arm ring assembly, and one end of the top of the bearing plate is provided with a holding assembly. The two ends of the holding assembly are fixedly communicated with the pressing assemblies, the arm ring assembly fixes the arms of a patient, the holding assembly and the pressing assemblies cooperate together to further fix the hand back of the patient and press the epidermis of the hand back to display vein blood vessels, the translation assembly and the angle adjusting assembly are matched, and a blood vessel inserting needle is locked under the assistance of the pressing assemblies. The angle adjusting assembly comprises a fixed static plate, a hinge is installed at one end of the fixed static plate, a needle inserting movable plate is installed at the top end of the hinge, the rotating angle of the hinge is 15-30 degrees, the needle inserting movable plate enables the needle inserting angle to be stably kept at 15-30 degrees under the action of the hinge, and the phenomenon of early-stage puncture errors of infusion exosmosis is avoided.

Description

Technical Field

[0001] This invention relates to the field of medical assistive device technology, and more specifically to a venous puncture fixation guide with locking function. Background Technology

[0002] Venipuncture is a commonly used invasive procedure in clinical practice. Its purpose is to insert a needle into a vein to achieve diagnostic and therapeutic needs such as blood collection, intravenous infusion, transfusion, and medication administration. Common puncture sites include superficial veins of the upper and lower extremities. In special cases, deep veins such as the external jugular vein and subclavian vein may be selected. Venipuncture of the dorsal hand is the most common medical procedure. However, during dorsal hand vein puncture, sudden arm movement can cause the needle to deviate from the vessel, slipping into surrounding tissue and leading to extravasation and initial puncture errors. Furthermore, during venous puncture, an excessively large needle angle can easily penetrate the posterior wall of the vessel, while an excessively small angle makes insertion difficult, resulting in puncture failure and increased patient discomfort. Therefore, we propose a venous puncture fixation guide with locking function to solve these problems. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides a vein puncture fixation guide with locking function to solve the problems existing in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a vein puncture fixation guide with locking function, comprising a fixation component, the fixation component comprising a support plate, an arm ring assembly mounted on the top of the support plate, a holding component mounted on one end of the top of the support plate, and a pressing component fixedly connected to both ends of the holding component; The arm ring assembly fixes the patient's arm, and the gripping and pressing components work together to further fix the back of the patient's hand and press the skin on the back of the hand to expose the veins. The translation and angle adjustment components work together to lock the vein for needle insertion with the assistance of the pressing component. The angle adjustment assembly includes a fixed stationary plate, a hinge is installed at one end of the fixed stationary plate, and a needle insertion moving plate is installed at the top of the hinge. The hinge rotates at an angle of 15-30°, and the needle insertion moving plate keeps the needle insertion angle stably maintained at 15-30° under the action of the hinge.

[0005] Furthermore, a gripping component is fixedly connected to one end of the fixing component, and an adjustment locking component is fixedly connected to the front of the gripping component.

[0006] Furthermore, an arm ring assembly is fixedly connected to one end of the top of the support plate, a support plate is fixedly connected to the other end of the top of the support plate, a wrist ring assembly is fixedly connected to the top of the support plate, a lead screw is fixedly connected to one end of the back of the arm ring assembly, and one end of the lead screw is fixedly connected to one end of the front of the wrist ring assembly.

[0007] Furthermore, the arm ring assembly includes a lower band member, an upper band member connected to the back of the lower band member via a rotating shaft, a buckle groove on the front of the lower band member, a locking groove on the front of the upper band member, a rotating shaft fixedly sleeved on the inner side of the locking groove, a threaded rod rotatably sleeved on the side of the rotating shaft, and the side of the rotating shaft rotatably sleeved on one end of the threaded rod rotatably sleeved on the other end of the threaded rod rotatably sleeved on, and a fastening knob rotatably sleeved on the inner side of the back of the soft rubber pad.

[0008] Furthermore, the gripping assembly includes a connecting ring plate, the bottom end of which is fixedly connected to one end of the support plate, a gripping assembly is fixedly connected to the inner side of the connecting ring plate, and a pressing assembly is fixedly connected to the back side of the connecting ring plate.

[0009] Furthermore, the grip assembly includes a palm grip, with cylinders fixedly sleeved at both ends of the palm grip. Piston rods are slidably sleeved on the inner sides of the two cylinders. A block is fixedly connected to one end of each of the two piston rods. A finger pull handle is fixedly connected to one end of each of the two blocks. Three return springs are fixedly connected to the front of the finger pull handle, and one end of each return spring is fixedly connected to the back of the palm grip. A connecting tube is fixedly connected to the side of one end of each of the two cylinders, and an annular tube is fixedly connected to the two connecting tubes.

[0010] Furthermore, the pressing assembly includes an annular tube, with two air tubes fixedly connected to the top of the front of the annular tube, and straight tubes fixedly connected to the bottom of one end of each of the two air tubes. Round rods are slidably sleeved on the inner sides of each of the two straight tubes, and side pressure plates are fixedly connected to the bottom of each of the two round rods. Several rubber strips are provided at the bottom of each of the two side pressure plates, and connecting rods are fixedly connected to both ends of the front of the annular tube.

[0011] Furthermore, the adjustment and locking assembly includes a translation assembly, an angle adjustment assembly is fixedly connected to the top of the translation assembly, and connecting plates are fixedly connected to both sides of the translation assembly. The back ends of one end of each of the two connecting plates are fixedly connected to one end of a connecting rod.

[0012] Furthermore, the translation component includes a guide rail, the top of which is slidably fitted with a slider.

[0013] Furthermore, the angle adjustment assembly includes a fixed stationary plate, one end of which is rotatably connected to a hinge, and the top of the hinge is fixedly connected to an insertion moving plate. The hinge rotates at an angle of 15-30°. One end of the fixed stationary plate is provided with a square groove, and a round tube is fixedly connected to one end of the fixed stationary plate, with the round tube located in the square groove. The bottom end of the round tube passes through the bottom of one end of the fixed stationary plate, and a threaded tube is fixedly connected to the bottom end of the round tube. A push rod is slidably connected to the inner side of the round tube, and a round shaft is fixedly connected to the top of the push rod. The round shaft is rotatably connected to one end of the bottom of the insertion moving plate. An adjustment knob is rotatably sleeved on the inner side of the threaded tube. One end of the bottom of the fixed stationary plate is fixedly connected to the top of the slider, and a round groove is provided in the middle of the top of the insertion moving plate.

[0014] The technical effects and advantages of this invention are as follows: 1. The arm and wrist clasp assemblies are used to immobilize the patient's arm, preventing large-scale movement. The arm clasp is tightened around the patient's forearm, and the tightness of the arm clasp is controlled by a tightening knob. This replaces the traditional method of using a rubber band to tighten the arm for easier puncture. When the patient grips the assembly, their fingers pull the handle, causing the piston rod to compress the cylinder, inflating the annular tube. This causes the side pressure plate to move downwards, pressing on the skin on the back of the hand, making the veins more visible. When the patient grips the assembly, their hand cannot move. This process avoids the possibility of sudden arm movement during puncture of the back of the hand, which could cause the needle to deviate from the vein and slip into surrounding tissue, leading to extravasation and other early puncture errors.

[0015] 2. After the gripping assembly clearly displays the patient's vein, the slider moves left and right on the guide rail, allowing the angle adjustment assembly to precisely align with the vein. Then, turning the adjustment knob allows gas from the threaded tube to enter the round tube, pushing the push rod upward and raising one end of the needle insertion plate to create an inclination, thus adjusting to the appropriate angle. Subsequently, by pushing the needle to move in the groove, the needle is stably inserted at the appropriate angle. This solves the problem that when performing venous puncture, an excessively large needle insertion angle can easily penetrate the posterior wall of the blood vessel, while an excessively small angle makes it difficult to insert the needle into the blood vessel, leading to puncture failure, thus reducing patient discomfort. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the fixed component structure of the present invention; Figure 3 This is a schematic diagram of the arm ring assembly structure of the present invention; Figure 4 This is a schematic diagram of the gripping assembly structure of the present invention; Figure 5 This is a schematic diagram of the holding component structure of the present invention; Figure 6 This is a schematic diagram of the pressing component structure of the present invention; Figure 7 This is a schematic diagram of the adjustment and locking component structure of the present invention; Figure 8 This is a schematic diagram of the translation component structure of the present invention; Figure 9 This is a schematic diagram of the angle adjustment component structure of the present invention.

[0017] The attached figures are labeled as follows: 1. Fixing assembly; 101. Bearing plate; 102. Arm ring assembly; 1021. Lower support; 1022. Upper support; 1023. Fastening knob; 1024. Soft rubber pad; 103. Wrist ring assembly; 2. Grip assembly; 201. Connecting ring plate; 202. Holding assembly; 2021. Hand grip; 2022. Cylinder; 2023. Finger pull handle; 2024. Return spring; 203. Pressing assembly; 2031. Ring tube; 2032. Air tube; 2033. Side pressure plate; 2034. Connecting rod; 3. Adjustment and locking assembly; 301. Translation assembly; 3011. Guide rail; 3012. Slider; 302. Angle adjustment assembly; 3021. Fixed stationary plate; 3022. Needle insertion moving plate; 3023. Threaded tube; 3024. Adjustment knob. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The intravenous puncture fixation guide with locking function involved in the present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Reference Figure 1 The present invention provides a venipuncture fixation guide with locking function, including a fixation component 1, one end of which is fixedly connected to a gripping component 2, and the front of the gripping component 2 is fixedly connected to an adjustment locking component 3.

[0020] In this embodiment, it is necessary to further explain that the fixing component 1 and the gripping component 2 prevent the patient's arm from suddenly moving during the venous puncture on the back of the hand, which could cause the needle to deviate from the blood vessel and slip into the surrounding tissue, leading to the phenomenon of early puncture failure and extravasation of the infusion. The gripping component 2 and the adjustment and locking component 3 solve the problem that when performing venous puncture, if the needle angle is too large, it is easy to penetrate the posterior wall of the blood vessel, and if the angle is too small, it is difficult to penetrate the blood vessel, thus leading to puncture failure. This reduces the patient's pain. The specific structure and working principle of the above components will be explained in detail later.

[0021] Reference Figure 2 The fixing component 1 includes a support plate 101. An arm ring assembly 102 is fixedly connected to one end of the top of the support plate 101. A support plate is fixedly connected to the other end of the top of the support plate 101. A wrist ring assembly 103 is fixedly connected to the top of the support plate. A lead screw is fixedly connected to one end of the back of the arm ring assembly 102, and one end of the lead screw is fixedly connected to one end of the front of the wrist ring assembly 103.

[0022] In this embodiment, it is necessary to specifically explain that the center points of the arm ring assembly 102 and the wrist ring assembly 103 are located on the same horizontal line, which is used to fix the patient's arm horizontally. The wrist ring assembly 103 replaces the rubber band to constrict the arm and block the blood return of the superficial veins of the arm, so that the veins are full and bulging, which facilitates the puncture operation and solves the drawback of the traditional rubber band that cannot adjust the tightness of the arm.

[0023] Reference Figure 3 The arm ring assembly 102 includes a lower band 1021, with an upper band 1022 connected to the back of the lower band 1021 via a rotating shaft. The lower band 1021 has a buckle groove on its front side, and the upper band 1022 has a locking groove on its front side. A rotating shaft is fixedly sleeved on the inner side of the locking groove. A threaded rod is rotatably sleeved on the side of the rotating shaft, and the side of the rotating shaft is rotatably sleeved on one end of the threaded rod. A fastening knob 1023 is rotatably sleeved on the other end of the threaded rod. A soft rubber pad 1024 is fixedly connected to the inner side of the back of the soft rubber pad 1024.

[0024] In this embodiment, it should be specifically noted that the armband assembly 102 and the wristband assembly 103 have the same structure, and the soft rubber pad 1024 can increase comfort and prevent slippage.

[0025] Reference Figure 4 The gripping assembly 2 includes a connecting ring plate 201, the bottom end of which is fixedly connected to one end of the bearing plate 101, a gripping assembly 202 is fixedly connected to the inner side of the connecting ring plate 201, and a pressing assembly 203 is fixedly connected to the back side of the connecting ring plate 201.

[0026] Reference Figure 5 The grip assembly 202 includes a palm grip 2021, with cylinders 2022 fixedly sleeved at both ends of the palm grip 2021. Piston rods are slidably sleeved on the inner sides of the two cylinders 2022. A block is fixedly connected to one end of each of the two piston rods. A finger pull handle 2023 is fixedly connected to one end of each of the two blocks. Three return springs 2024 are fixedly connected to the front of the finger pull handle 2023, and one end of each return spring 2024 is fixedly connected to the back of the palm grip 2021. A connecting tube is fixedly connected to one side of each of the two cylinders 2022, and an annular tube 2031 is fixedly connected to the two connecting tubes.

[0027] Reference Figure 6 The pressing component 203 includes an annular tube 2031. Two air tubes 2032 are fixedly connected to the top of the front side of the annular tube 2031. A straight tube is fixedly connected to the bottom of one end of each of the two air tubes 2032. A round rod is slidably sleeved on the inner side of each of the two straight tubes. A side pressure plate 2033 is fixedly connected to the bottom of each of the two round rods. Several rubber strips are provided at the bottom of each of the two side pressure plates 2033. A connecting rod 2034 is fixedly connected to both ends of the front side of the annular tube 2031.

[0028] In this embodiment, it is necessary to further explain that the annular tube 2031 is a hollow annular tube. The patient naturally grasps the palm handle 2021 of the grip component 202 with their palm, and their fingers naturally hook onto the finger pull handle 2023. When the patient grips tightly and gently pulls the finger pull handle backward, the piston rod slides inside the cylinder 2022, compressing the internal air. The gas enters the annular tube 2031 through the connecting tube, and is then delivered to the straight tube through the trachea 2032. The gas pressure pushes the cylindrical rod downward, causing the side pressure plate 2033 to press down and adhere to the skin on both sides of the back of the hand. The rubber strip at the bottom of the side pressure plate increases friction, stabilizing the pressure on the skin, making the subcutaneous veins more prominent and clearly visible due to local pressure. During the patient's grip, the hand is naturally fixed, effectively preventing unconscious movements.

[0029] The arm ring assembly 102 and wrist ring assembly 103 are used to fix the patient's arm, preventing it from making large-scale movements. The arm ring assembly 102 constricts the patient's forearm, and the tightness of the arm ring assembly is controlled by the fastening knob 1023, replacing the traditional rubber band that constricts the arm for easier puncture. When the patient grips the holding assembly 202, their fingers pull the finger pull handle 2023, causing the piston rod to squeeze the cylinder and inflate the annular tube 2031. The air enters the straight tube, pushing the rod downward, which in turn causes the side pressure plate 2033 to move downward, pressing on the skin on the back of the hand to make the veins clearer. When the patient grips the holding assembly, their hand cannot move. This process avoids the phenomenon of early puncture errors caused by sudden arm movements during puncture of the back of the hand vein, which could lead to the needle deviating from the blood vessel and slipping into the surrounding tissue, resulting in extravasation of the infusion.

[0030] Reference Figure 7 The adjustment and locking assembly 3 includes a translation assembly 301. An angle adjustment assembly 302 is fixedly connected to the top of the translation assembly 301. Connecting plates are fixedly connected to both sides of the translation assembly 301. The back of one end of each of the two connecting plates is fixedly connected to one end of the connecting rod 2034.

[0031] Reference Figure 8 The translation component 301 includes a guide rail 3011, and a slider 3012 is slidably sleeved on the top of the guide rail 3011.

[0032] Reference Figure 9 The angle adjustment component 302 includes a fixed stationary plate 3021. One end of the fixed stationary plate 3021 is rotatably connected to a hinge, and the top end of the hinge is fixedly connected to an insertion moving plate 3022. The hinge rotates at an angle of 15-30°. One end of the fixed stationary plate 3021 is provided with a square groove. One end of the fixed stationary plate 3021 is fixedly connected to a round tube, which is located in the square groove. The bottom end of the round tube passes through the bottom of one end of the fixed stationary plate 3021, and the bottom end of the round tube is fixedly connected to a threaded tube 3023. A push rod is slidably connected to the inner side of the round tube. A round shaft is fixedly connected to the top end of the push rod. The round shaft is rotatably connected to the bottom end of the insertion moving plate 3022. An adjustment knob 3024 is rotatably sleeved on the inner side of the threaded tube 3023. One bottom end of the fixed stationary plate 3021 is fixedly connected to the top of the slider 3012. A round groove is provided in the middle of the top of the insertion moving plate 3022.

[0033] After the gripping assembly 2 clearly displays the patient's vein, the slider 3012 moves left and right on the guide rail 3011, allowing the angle adjustment assembly 302 to precisely align with the vein. Then, the adjustment knob 3024 is turned to allow gas in the threaded tube 3023 to enter the round tube, pushing the push rod upward and causing one end of the needle insertion plate 3022 to rise and tilt, thus adjusting to a suitable angle. Subsequently, by pushing the needle to move in the groove, the needle is stably punctured at a suitable angle. This solves the problem that when performing venous puncture, if the needle insertion angle is too large, it will easily penetrate the posterior wall of the blood vessel, and if the angle is too small, it will be difficult to puncture the blood vessel, thus leading to puncture failure, and reduces patient pain.

[0034] In this embodiment, it should be specifically explained that the hinge rotation angle is 15-30°, so that the adjustment angle of the needle insertion plate 3022 is 15-30°, which is the optimal needle insertion angle range. The needle is placed on the top and the circular groove of the needle insertion plate 3022. The needle insertion plate 3022 is used to guide the needle forward and prevent it from being misaligned. Place the needle hub of the intravenous puncture needle securely in the circular groove at the top of the needle insertion plate 3022, align the needle tip with the pre-locked skin puncture point below, and smoothly advance the needle along the inclined track formed by the needle insertion plate. This allows the needle to pierce the skin and enter the vein at a preset, precise angle. After successful puncture and confirmation that the needle is inside the blood vessel, first release the finger pull handle 2023. Under the action of the return spring 2024, the piston rod returns to its original position, and the side pressure plate 2033 rises after the internal air pressure is balanced, releasing the pressure on the back of the hand. Then, loosen the fastening knobs 1023 of the arm ring assembly 102 and wrist ring assembly 103, and open the upper restraint 1022 to remove the patient's arm from the fixing assembly. Finally, remove the adjustment locking assembly 3 from above the back of the hand to complete the entire operation.

[0035] The working principle of this invention is as follows: The arm ring assembly 102 and wrist ring assembly 103 are used to fix the patient's arm, preventing it from making large-scale movements. The arm ring assembly 102 constricts the patient's forearm, and the tightness of the arm ring assembly is controlled by the fastening knob 1023, which replaces the traditional rubber band that constricts the arm for easy puncture. When the patient grips the holding assembly 202, their fingers pull the finger pull handle 2023, causing the piston rod to squeeze the cylinder and inflate the annular tube 2031. The air enters the straight tube, pushing the rod downward, which in turn causes the side pressure plate 2033 to move downward, pressing the skin on the back of the hand to make the veins clearer. When the patient grips the holding assembly, their hand cannot move. This process avoids the phenomenon of sudden arm movement during puncture of the back of the hand vein, which could cause the needle to deviate from the blood vessel and slip into the surrounding tissue, leading to extravasation and early puncture errors. After the gripping assembly 2 clearly displays the patient's vein, the slider 3012 moves left and right on the guide rail 3011, allowing the angle adjustment assembly 302 to precisely align with the vein. Then, the adjustment knob 3024 is turned to allow gas in the threaded tube 3023 to enter the round tube, pushing the push rod upward and causing one end of the needle insertion plate 3022 to rise and tilt, thus adjusting to a suitable angle. Subsequently, by pushing the needle to move in the groove, the needle is stably punctured at a suitable angle. This solves the problem that when performing venous puncture, if the needle insertion angle is too large, it will easily penetrate the posterior wall of the blood vessel, and if the angle is too small, it will be difficult to puncture the blood vessel, thus leading to puncture failure, and reduces patient pain.

[0036] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other. In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A venipuncture fixation guide with locking function, comprising a fixation component (1), said fixation component (1) comprising a support plate (101), characterized in that, An arm ring assembly (102) is installed on the top of the support plate (101), and a gripping assembly (202) is installed at one end of the top of the support plate (101). A pressing assembly (203) is fixedly connected to both ends of the gripping assembly (202). The arm ring assembly (102) fixes the patient's arm. The gripping assembly (202) and the pressing assembly (203) work together to further fix the back of the patient's hand and press the skin of the back of the hand to expose the veins. The translation assembly (301) and the angle adjustment assembly (302) work together to lock the vein for needle insertion with the assistance of the pressing assembly (203). The angle adjustment component (302) includes a fixed stationary plate (3021), one end of which is fitted with a hinge, and the top of the hinge is fitted with a needle insertion moving plate (3022). The hinge rotates at an angle of 15-30°, and the needle insertion moving plate (3022) keeps the needle insertion angle stably maintained at 15-30° under the action of the hinge.

2. The venipuncture fixation guide with locking function according to claim 1, characterized in that: One end of the fixing component (1) is fixedly connected to the gripping component (2), and the front of the gripping component (2) is fixedly connected to the adjusting locking component (3).

3. The venipuncture fixation guide with locking function according to claim 2, characterized in that: One end of the top of the support plate (101) is fixedly connected to an arm ring assembly (102), the other end of the top of the support plate (101) is fixedly connected to a support plate, the top of the support plate is fixedly connected to a wrist ring assembly (103), one end of the back of the arm ring assembly (102) is fixedly connected to a lead screw, and one end of the lead screw is fixedly connected to one end of the front of the wrist ring assembly (103).

4. The venipuncture fixation guide with locking function according to claim 3, characterized in that: The arm ring assembly (102) includes a lower bracket (1021), the back of which is connected to an upper bracket (1022). The lower bracket (1021) has a buckle groove on its front side, and the upper bracket (1022) has a locking groove on its front side. A rotating shaft is fixedly sleeved on the inner side of the locking groove. A threaded rod is rotatably sleeved on the side of the rotating shaft, and the side of the rotating shaft is rotatably sleeved on one end of the threaded rod. A fastening knob (1023) is rotatably sleeved on the other end of the threaded rod. A soft rubber pad (1024) is fixedly connected to the inner side of the back of the soft rubber pad (1024).

5. The venipuncture fixation guide with locking function according to claim 4, characterized in that: The gripping assembly (2) includes a connecting ring plate (201), the bottom end of which is fixedly connected to one end of the bearing plate (101), a gripping assembly (202) is fixedly connected to the inner side of the connecting ring plate (201), and a pressing assembly (203) is fixedly connected to the back side of the connecting ring plate (201).

6. The venipuncture fixation guide with locking function according to claim 5, characterized in that: The grip assembly (202) includes a palm grip (2021), with cylinders (2022) fixedly sleeved at both ends of the palm grip (2021). Piston rods are slidably sleeved on the inner sides of the two cylinders (2022). A block is fixedly connected to one end of each of the two piston rods. A finger pull handle (2023) is fixedly connected to one end of each of the two blocks. Three return springs (2024) are fixedly connected to the front of the finger pull handle (2023), and one end of each return spring (2024) is fixedly connected to the back of the palm grip (2021). A connecting tube is fixedly connected to the side of one end of each of the two cylinders (2022), and an annular tube (2031) is fixedly connected to the two connecting tubes.

7. The venipuncture fixation guide with locking function according to claim 6, characterized in that: The pressing assembly (203) includes an annular tube (2031). The top of the front of the annular tube (2031) is fixedly connected to two air tubes (2032). The bottom of one end of each of the two air tubes (2032) is fixedly connected to a straight tube. The inner side of each of the two straight tubes is slidably sleeved with a round rod. The bottom of each of the two round rods is fixedly connected to a side pressure plate (2033). The bottom of each of the two side pressure plates (2033) is provided with several rubber strips. Both ends of the front of the annular tube (2031) are fixedly connected to a connecting rod (2034).

8. The venipuncture fixation guide with locking function according to claim 7, characterized in that: The adjustment and locking assembly (3) includes a translation assembly (301), an angle adjustment assembly (302) is fixedly connected to the top of the translation assembly (301), and connecting plates are fixedly connected to both sides of the translation assembly (301). The back of one end of each of the two connecting plates is fixedly connected to one end of the connecting rod (2034).

9. The venipuncture fixation guide with locking function according to claim 8, characterized in that: The translation component (301) includes a guide rail (3011) on which a slider (3012) is slidably sleeved.

10. The venipuncture fixation guide with locking function according to claim 9, characterized in that: The angle adjustment assembly (302) includes a fixed stationary plate (3021), one end of which is rotatably connected to a hinge, and the top end of the hinge is fixedly connected to a needle-feeding moving plate (3022). The hinge rotates at an angle of 15-30°. One end of the fixed stationary plate (3021) is provided with a square groove, and one end of the fixed stationary plate (3021) is fixedly connected to a round tube, which is located in the square groove. The bottom end of the round tube passes through the bottom of one end of the fixed stationary plate (3021). The bottom end of the round tube is fixedly connected to a threaded tube (3023), the inner side of the round tube is slidably connected to a push rod, the top end of the push rod is fixedly connected to a round shaft, the round shaft is rotatably connected to one end of the bottom of the needle insertion moving plate (3022), the inner side of the threaded tube (3023) is rotatably sleeved with an adjustment knob (3024), one end of the bottom of the fixed stationary plate (3021) is fixedly connected to the top of the slider (3012), and a round groove is provided in the middle of the top of the needle insertion moving plate (3022).

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