Blood sampling fixing device

Abstract

The utility model discloses a blood sampling fixing device, relates to the technical field of medical instruments, and solves the technical problems that an existing device is inconvenient to use and low in efficiency due to the fact that the existing device is inconvenient to fix patients with different arm thicknesses. The device comprises a shell, linkage extrusion assemblies and an arm supporting plate, the linkage extrusion assemblies and the arm supporting plate are arranged in the shell, the arm supporting plate is connected with the shell in a sliding mode, the linkage extrusion assemblies are connected to the two sides of the arm supporting plate, and each linkage extrusion assembly comprises a second connecting rod. A first connecting rod and a third connecting rod are hinged to the two ends of the second connecting rod correspondingly, the first connecting rod is hinged to the arm supporting plate, a pressing plate is arranged at the end of the third connecting rod, a rotating limiting piece is rotationally arranged on the first connecting rod and rotationally connected with the inner side wall of the shell, and the arm supporting plate is stressed to downwards press the first connecting rod, so that the second connecting rod is lifted; the arm fixing device has the advantages of being high in fixing efficiency, wide in application range and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment, and particularly relates to a blood sampling and fixing device. Background Art

[0002] Phlebotomy refers to the process of obtaining a blood sample through a vein or artery by medical personnel for medical examinations or related needs. Depending on the site and purpose of blood collection, it can be categorized into venous, arterial, and capillary blood collection. Venous blood collection is the most common, typically used for tests such as routine blood tests, blood biochemistry, and coagulation tests. During the blood collection process, the cubital vein is the preferred site for venous blood collection due to its large size and superficiality, making it easy to observe and locate. When drawing blood from certain special patients, such as those with uncontrolled limbs or those with mental illness, the upper arm is often secured during cubital vein blood collection to ensure a smooth, efficient, and accurate blood collection process. This stabilizes the patient's limb, allowing the doctor or nurse to more quickly and accurately locate the vein and perform the puncture. Furthermore, securing the arm reduces the risk of complications such as pain, hematoma, and infection caused by improper blood collection.

[0003] In the existing patent CN217548233U, an arm support for blood collection in a physical examination center is disclosed, which includes a bottom box, a placement block, a moving device and a first cloth belt. Four electric telescopic cylinders are fixedly connected to the inner side of the bottom box. The bottom of the placement block is arranged on the inner side of the bottom box, and the bottom of the placement block is fixedly connected to the telescopic end of the electric telescopic cylinder. The moving device is arranged at one end of the placement block. The moving device includes a placement slot, a screw rod, a moving plate, a connecting block, a fixed plate and a handle. The placement slot is opened at the bottom of the placement block. The screw rod is rotatably connected to the placement slot through a bearing, and one end of the screw rod is arranged at the placement slot. On the outside, a through hole is opened in the center of the movable plate, and the screw rod is threadedly connected to the inner wall of the through hole of the movable plate. Both ends of the movable plate are fixedly connected with connecting blocks, which are inserted into the through holes opened in the side walls of the placement slots, and the connecting blocks are slidably connected to the through holes in the side walls of the placement slots. One end of the connecting block is fixedly connected to the fixed plate, and the handle is fixedly connected to the screw rod. The side wall of the first cloth belt is fixedly connected to the fixed plate, and the side wall of the end of the first cloth belt away from the fixed plate is fixedly connected with the first Velcro fur surface. The first Velcro fur surface is used in conjunction with the first Velcro hook surface, and the first Velcro hook surface is fixedly connected to the other side wall of the fixed plate.

[0004] In the above-mentioned device, it relies on the lead screw to drive the movable plate to move, so that the hook surface and the loop surface of the first Velcro move at the same time to adapt to the arm lengths of different people, and the placement block is raised and lowered by the electric telescopic cylinder to facilitate blood collection. However, in the existing device, the patient's hand is manually fixed by Velcro. For patients with different arm diameters, it is not easy for doctors to grasp the tightness of the Velcro. If it is too tight, it may cause discomfort to the patient, and if it is too loose, it may not achieve a good fixing effect.

[0005] Based on the problems existing in the above-mentioned existing patents, it is necessary to develop a device that can adapt to different patient arm diameters and is easy to fix. Utility Model Content

[0006] The utility model provides a blood sampling fixation device, which aims to solve the technical problem that the existing device is inconvenient to fix patients with different arm thicknesses, resulting in inconvenience in use and low efficiency.

[0007] In order to solve the above-mentioned technical problems, the technical solutions adopted by this invention are as follows:

[0008] A blood sampling and fixing device, comprising a housing, a linkage extrusion assembly and an arm support plate,

[0009] The linkage extrusion assembly and the arm support plate are both arranged inside the shell, the arm support plate is slidably connected to the shell, and both sides of the arm support plate are connected to the linkage extrusion assembly.

[0010] The linkage extrusion assembly includes a second connecting rod, and the first connecting rod and the third connecting rod are hinged at both ends of the second connecting rod. The first connecting rod is hinged to the arm support plate, and the end of the third connecting rod is provided with a pressure plate. A rotation limiter is rotatably provided on the first connecting rod, and the rotation limiter is rotatably connected to the inner side wall of the shell. The arm support plate is subjected to force to press down the first connecting rod, thereby lifting the second connecting rod, so that the third connecting rods on both sides of the arm support plate are close to each other.

[0011] The utility model provides a linkage squeezing assembly. When the patient's arm is placed on the arm support board, the arm support board is pressed down under the action of the weight of the arm, so that the first connecting rod rotates with the rotation limiter as the center of the circle. The rotation of the first connecting rod causes the second connecting rod to lift up and move toward the side close to the arm support board. The movement of the second connecting rod drives the third connecting rod and the pressure plate on the third connecting rod to move accordingly, so that the pressure plates on both sides of the arm support board are squeezed inward to clamp the patient's arm and fix it.

[0012] In addition, it should be noted that when the patient is having blood drawn, after the arm is placed on the arm support, the arm's own gravity will inevitably generate downward pressure on the arm support. Under ideal conditions, the greater the downward pressure, the better the fixing effect.

[0013] Furthermore, two third slide rails are symmetrically provided on at least one of the two opposite inner walls in the transverse direction of the shell, the third slide rails are arc-shaped, the third slide rails are parallel to the third connecting rod, and a sliding limiter is provided on the third connecting rod, and one end of the sliding limiter is slidably engaged with the third slide rail.

[0014] After adopting this technical solution, it should be noted that by setting a third slide rail and setting a sliding limiter on the third connecting rod that is slidably connected to the third slide rail, the moving trajectory of the third connecting rod and the pressure plate is limited, and a stable clamping and fixing effect is achieved. In the utility model, a slide groove is provided on the third slide rail, and the end of the sliding limiter is slidably connected to the slide groove. In addition, in order to achieve smooth sliding, a ball can be set at the end of the sliding limiter, and the moving trajectory of the third connecting rod can also be limited by the rolling connection between the ball and the slide groove.

[0015] Furthermore, two second slide rails are symmetrically provided on at least one of the two opposite inner walls in the horizontal direction of the shell, and the second slide rails are vertically arranged. Second slide grooves are provided on the opposite sides of the two second slide rails on the same inner wall of the shell, and the two sides of the arm support are slidably connected to the second slide grooves.

[0016] After adopting this technical solution, it should be noted that a through hole is provided through the shell along the direction of arm placement, and the second slide rail and the third slide rail are both arranged on the inner wall of the through hole set in the shell, and are distributed on both sides of the through hole. The second slide groove is arranged on the side of the second slide rail close to the through hole. By setting the second slide rail, the movement of the arm support plate is limited, and it maintains a relatively stable state when it is forced to move downward.

[0017] Furthermore, a side panel is provided on at least one end of the arm support plate, and a slider is provided on the side of each side panel close to the two second slide rails on the same inner wall of the shell, and the slider is slidably engaged with the second slide groove.

[0018] Preferably, two second slide rails are provided on the two opposite inner side walls of the shell in the horizontal direction, the side panels are provided on both ends of the arm support corresponding to the second slide rails, and the sliders are provided on both sides of the two side panels close to the corresponding second slide rails.

[0019] After adopting this technical solution, it should be noted that the arm support is limited by the four second slide rails, thereby further improving the stability of the arm support during movement.

[0020] Preferably, two third slide rails are symmetrically arranged on an inner side wall in the transverse direction of the shell to reduce the weight of the device.

[0021] Furthermore, an elastic member is connected between the lower end of the second sliding groove and the sliding block.

[0022] After adopting this technical solution, it should be noted that when the elastic part is at its free length, the slider is located at the uppermost end of the second slide groove, the first connecting rod is in an inclined state, the second connecting rod is in an inclined state toward the arm support plate, and the third connecting rod is in a downward inclined state. On the one hand, the elastic part causes the arm support plate to slowly and steadily descend after being subjected to the gravity of the arm, thereby achieving a more stable clamping. On the other hand, after the blood collection is completed, the arm support plate is automatically reset under the elastic force of the elastic part.

[0023] Furthermore, a connecting piece is provided at the lower end of the arm support plate, and the first connecting rods on both sides of the arm support plate are hinged to the connecting piece respectively.

[0024] After adopting this technical solution, it should be noted that the connecting member and the first connecting rod are hinged via a pin.

[0025] Furthermore, the housing includes a first housing and a second housing, the lower ends of the first housing and the second housing are provided with a base, and the first housing and / or the second housing are slidably connected to the base.

[0026] After adopting this technical solution, it should be noted that the first shell and the second shell can clamp and fix the patient's forearm and upper arm respectively to achieve a better arm fixation effect, and the sliding connection can adaptively adjust the first shell and the second shell according to the patient's arm length.

[0027] Furthermore, two mutually symmetrical first slide rails are provided at the upper end of the base, and first slide grooves corresponding to the first slide rails are provided at the lower end of the first shell and / or the second shell, and the first slide grooves are slidably engaged with the first slide rails.

[0028] Furthermore, the first housing and / or the second housing are provided with limiting holes on both sides close to the first slide rail, and fixing pieces are provided in the limiting holes.

[0029] After adopting this technical solution, it should be noted that the limiting hole is a threaded hole and the fixing part is a bolt. After the first shell and / or the second shell is moved into place, the bolt is tightened so that the bolt is pressed against the side of the first slide rail to fix the corresponding shell.

[0030] Preferably, the second shell is fixedly provided at one end of the base, and the second shell is slidably connected to the base. The second shell is used to fix the upper arm, and only the first shell is adjusted to fix the lower arm well to improve efficiency.

[0031] Preferably, a first fixing threaded hole is also provided on the first connecting rod, and a second fixing piece is provided on the side of the two second sliding rails on the same inner side of the shell close to the first connecting rod. A second fixing threaded hole corresponding to the first fixing threaded hole is provided on the second fixing piece, and a fixing bolt is provided in the first fixing threaded hole, and the fixing bolt can cooperate with the second fixing threaded hole.

[0032] After adopting this technical solution, it should be noted that in actual situations, some patients' hands may swing uncontrollably. When the arm moves upward, the arm support is not subjected to pressure, and the linkage extrusion assembly no longer clamps the arm, causing the device to clamp unstable. Therefore, during use, after the patient's arm is placed on the arm support and clamped, tighten the fixing bolt to limit the rotation of the first connecting rod. At this time, the second connecting rod and the third connecting rod will also be fixed, thereby stably clamping the patient's arm.

[0033] Preferably, a first fixing member is provided on the inner side wall of the housing corresponding to the rotation limiting member, and an end portion of the rotation limiting member is rotatably connected to the first fixing member.

[0034] Preferably, the arm support plate is covered with silica gel.

[0035] The steps of using this utility model are as follows:

[0036] Shell adjustment: Before use, loosen the bolts on the side of the first shell at the upper arm of the patient's arm corresponding to the second shell, slide the first shell according to the length of the patient's arm, and tighten the bolts after sliding to the appropriate position to fix the first shell. The patient will first insert the arm into the second shell and then through the first shell, and place the upper arm and forearm on the arm support plate in the second shell and the arm support plate in the first shell respectively, taking care to expose the blood collection position.

[0037] When there is only one squeezing component: after the arm is placed on the corresponding arm support, the arm support will be pressed down under the natural pressure of the arm, and the movement of the arm support drives the first connecting rod to rotate along the rotation limiter as the center of the circle. The rotation of the first connecting rod causes the second connecting rod to lift up and move toward the side close to the arm support. The movement of the second connecting rod drives the third connecting rod and the pressure plate on the third connecting rod to move accordingly. With the cooperation of the third slide rail and the sliding limiter, the pressure plates on both sides of the arm support are squeezed inward to clamp the patient's arm and fix it. In this state, only the patient's upper arm or forearm is supported, which is highly flexible and convenient for doctors to draw blood.

[0038] When there are two extrusion components: after the arm is placed on the corresponding arm support plate, the arm support plate will be pressed down under the natural pressure of the arm, and the extrusion process is the same as above to achieve the fixation of the upper and lower arms.

[0039] Complete arm fixation: For patients whose arms are uncontrolled and may cause the compression plate to repeatedly squeeze the arm, after the primary fixation is completed, the fixing bolt on the first link can be tightened to limit the rotation of the first link, thereby keeping the second and third links fixed.

[0040] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0041] 1. The utility model provides a blood sampling fixation device, which is equipped with a linkage squeezing assembly. The linkage squeezing assembly clamps the patient's arm through the gravity of the arm, and can achieve good fixation for patients with different arm thicknesses.

[0042] 2. The utility model provides a blood sampling and fixing device, which limits the moving trajectory of the third connecting rod and the pressure plate by setting a third slide rail and setting a sliding limiter on the third connecting rod that is slidably connected to the third slide rail, thereby achieving a stable clamping and fixing effect.

[0043] 3. The utility model provides a blood sampling fixing device, which is provided by arranging a first fixing threaded hole on the first connecting rod, correspondingly arranging a second fixing piece on the inner wall of the shell, and correspondingly arranging a second fixing threaded hole on the second fixing piece, and arranging fixing bolts in the first fixing threaded hole and the second fixing threaded hole, tightening the fixing bolts on the first connecting rod, thereby limiting the rotation of the first connecting rod, thereby keeping the second connecting rod and the third connecting rod fixed. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The present invention will be described by way of examples with reference to the accompanying drawings, in which:

[0045] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0046] Figure 2 This is a schematic diagram of the structure of the arm support plate and the linkage extrusion assembly of the utility model;

[0047] Figure 3 This is a schematic diagram of the internal structure of the first shell or the second shell of the utility model;

[0048] Figure 4 This is a top view of the overall structure of the utility model;

[0049] Figure 5 For this utility model Figure 4 Cross-sectional view in the middle BB direction;

[0050] Figure 6 For this utility model Figure 4 Cross-sectional view along the AA direction.

[0051] Reference numerals:

[0052] 1-first shell, 101-first slide, 102-limiting hole, 2-arm support plate, 201-side plate, 202-slider, 203-connecting part, 3-linkage extrusion assembly, 301-first connecting rod, 302-second connecting rod, 303-third connecting rod, 304-pressing plate, 305-sliding limiter, 306-rotation limiter, 4-base, 5-second shell, 6-first slide rail, 7-fixing part, 8-foot pad, 9-second slide rail, 901-second slide groove, 10-third slide rail, 11-elastic part, 12-first fixing part. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application and the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and indicated in the accompanying drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the application for which protection is claimed, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of this application.

[0054] In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, or are the orientation or positional relationship in which the practical product is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0055] The following combination Figure 1-Figure 5 The utility model is described in detail.

[0056] A blood sampling and fixing device, comprising a housing, a linkage extrusion assembly 3 and an arm support plate 2,

[0057] The linkage extrusion assembly 3 and the arm support plate 2 are both arranged inside the shell, the arm support plate 2 is slidably connected to the shell, and the linkage extrusion assembly 3 is connected to both sides of the arm support plate 2.

[0058] The linkage extrusion assembly 3 includes a second connecting rod 302, and the two ends of the second connecting rod 302 are respectively hinged with a first connecting rod 301 and a third connecting rod 303. The first connecting rod 301 is hinged to the arm support plate 2, and the end of the third connecting rod 303 is provided with a pressure plate 304. A rotation limiter 306 is rotatably provided on the first connecting rod 301, and the rotation limiter 306 is rotatably connected to the inner side wall of the shell. The arm support plate 2 is subjected to force to press down the first connecting rod 301, thereby lifting the second connecting rod 302, so that the third connecting rods 303 on both sides of the arm support plate 2 are close to each other.

[0059] Two third slide rails 10 are symmetrically provided on at least one of the two opposite inner walls in the transverse direction of the shell. The third slide rail 10 is arc-shaped. The third slide rail 10 is parallel to the third connecting rod 303. A sliding limiter 305 is provided on the third connecting rod 303. One end of the sliding limiter 305 slides in cooperation with the third slide rail 10.

[0060] Two second slide rails 9 are symmetrically provided on at least one of the two opposite inner walls in the horizontal direction of the shell. The second slide rails 9 are vertically arranged. Second slide grooves 901 are provided on the opposite sides of the two second slide rails 9 on the same inner wall of the shell. The two sides of the arm support plate 2 are slidably connected to the second slide grooves 901.

[0061] A side panel 201 is provided on at least one end of the arm support plate 2, and a slider 202 is provided on the side of each side panel 201 close to the two second slide rails 9 on the same inner wall of the shell, and the slider 202 slides in cooperation with the second slide groove 901.

[0062] In another embodiment, two second slide rails 9 are provided on the two opposite inner side walls of the shell in the transverse direction, the side panels 201 are provided on both end sides of the arm support plate 2 corresponding to the second slide rails 9, and the sliders 202 are provided on both sides of the two side panels 201 close to the corresponding second slide rails 9.

[0063] In another embodiment, the rotation limiter 306 is arranged close to the arm support plate 2, so that the lowering height of the arm support plate 2 is less than the rising height of the hinged end of the first connecting rod 301 and the second connecting rod 302, so that the movement range of the subsequent pressure plate 304 is larger.

[0064] In another embodiment, two third slide rails 10 are symmetrically arranged on an inner side wall in the transverse direction of the housing to reduce the weight of the device.

[0065] An elastic member 11 is connected between the lower end of the second sliding groove 901 and the slider 202 .

[0066] A connecting piece 203 is provided at the lower end of the arm support plate 2 , and the first connecting rods 301 on both sides of the arm support plate 2 are hinged to the connecting piece 203 respectively.

[0067] The housing includes a first housing 1 and a second housing 5 . A base 4 is provided at the lower end of the first housing 1 and the second housing 5 . The first housing 1 and / or the second housing 5 are slidably connected to the base 4 .

[0068] The upper end of the base 4 is provided with two mutually symmetrical first slide rails 6, and the lower end of the first shell 1 and / or the second shell 5 is provided with a first slide groove 101 corresponding to the first slide rail 6, and the first slide groove 101 is slidably matched with the first slide rail 6.

[0069] The first housing 1 and / or the second housing 5 are provided with limiting holes 102 on both sides close to the first slide rail 6 , and fixing members 7 are provided in the limiting holes 102 .

[0070] In another embodiment, the second shell 5 is fixedly provided at one end of the base 4 and is slidably connected to the base 4. The second shell 5 is used to fix the upper arm, and only the first shell 1 is adjusted to fix the lower arm well to improve efficiency.

[0071] In another embodiment, a first fixing threaded hole is further provided on the first connecting rod 301, and a second fixing member 7 is provided on the side of the two second sliding rails 9 on the same inner side of the outer shell close to the first connecting rod 301. The second fixing member 7 is provided with a second fixing threaded hole corresponding to the first fixing threaded hole, and a fixing bolt is provided in the first fixing threaded hole, and the fixing bolt can cooperate with the second fixing threaded hole.

[0072] In another embodiment, a first fixing member 7 is provided on the inner side wall of the housing corresponding to the rotation limiting member 306 , and an end portion of the rotation limiting member 306 is rotatably connected to the first fixing member 7 .

[0073] The arm support plate 2 is covered with silica gel.

[0074] The steps of using this utility model are as follows:

[0075] Shell adjustment: Before use, loosen the bolts on the side of the first shell 1 at the upper arm of the patient's arm corresponding to the second shell 5, slide the first shell 1 according to the length of the patient's arm, and tighten the bolts after sliding to the appropriate position to fix the first shell 1. The patient first inserts his arm into the second shell 5 and then through the first shell 1, and places the upper arm and forearm on the arm support 2 in the second shell 5 and the arm support 2 in the first shell 1 respectively, taking care to expose the blood collection position.

[0076] When there is only one squeezing component: after the arm is placed on the corresponding arm support plate 2, the arm support plate 2 will be pressed down under the natural pressure of the arm, and the movement of the arm support plate 2 drives the first connecting rod 301 to rotate along the rotation limiter 306 as the center of the circle. The rotation of the first connecting rod 301 causes the second connecting rod 302 to lift up and move toward the side close to the arm support plate 2. The movement of the second connecting rod 302 drives the third connecting rod 303 and the pressure plate 304 on the third connecting rod 303 to produce corresponding movement. With the cooperation of the third slide rail 10 and the sliding limiter 305, the pressure plates 304 on both sides of the arm support plate 2 are squeezed inward to clamp the patient's arm for fixation. In this state, only the patient's upper arm or forearm is supported, which is highly flexible and convenient for doctors to draw blood.

[0077] When there are two squeezing components: after the arm is placed on the corresponding arm support plate 2, the arm support plate 2 is pressed down under the natural pressure of the arm, and the squeezing process is the same as above to achieve the fixation of the upper and lower arms.

[0078] Complete arm fixation: For patients whose arms are uncontrolled and may cause the pressure plate 304 to repeatedly squeeze the arms, after the primary fixation is completed, the fixing bolt on the first connecting rod 301 can be tightened to limit the rotation of the first connecting rod 301, so that the second connecting rod 302 and the third connecting rod 303 remain fixed.

[0079] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A blood sampling and fixing device, characterized in that: It comprises a housing, a linkage extrusion assembly (3) and an arm support plate (2), The linkage extrusion assembly (3) and the arm support plate (2) are both arranged inside the shell, the arm support plate (2) is slidably connected to the shell, and both sides of the arm support plate (2) are connected to the linkage extrusion assembly (3). The linkage extrusion assembly (3) includes a second connecting rod (302), the two ends of the second connecting rod (302) are respectively hinged with a first connecting rod (301) and a third connecting rod (303), the first connecting rod (301) is hinged with the arm support plate (2), the end of the third connecting rod (303) is provided with a pressure plate (304), the first connecting rod (301) is rotatably provided with a rotation limiter (306), the rotation limiter (306) is rotatably connected to the inner side wall of the shell, the arm support plate (2) is subjected to force to press the first connecting rod (301) downward, thereby lifting the second connecting rod (302) and making the third connecting rods (303) on both sides of the arm support plate (2) close to each other.

2. A blood sampling and fixing device according to claim 1, characterized in that: Two third slide rails (10) are symmetrically provided on at least one of the two opposite inner side walls in the transverse direction of the shell, and the third slide rail (10) is arc-shaped. The third slide rail (10) and the third connecting rod (303) are parallel to each other, and a sliding limiter (305) is provided on the third connecting rod (303), and one end of the sliding limiter (305) is in sliding engagement with the third slide rail (10).

3. A blood sampling and fixing device according to claim 1 or 2, characterized in that: Two second slide rails (9) are symmetrically provided on at least one of the two opposite inner side walls in the transverse direction of the shell, and the second slide rails (9) are vertically arranged. Second slide grooves (901) are provided on the opposite side surfaces of the two second slide rails (9) on the same inner wall of the shell, and the two sides of the arm support plate (2) are slidably connected to the second slide grooves (901).

4. A blood sampling and fixing device according to claim 3, characterized in that: A side plate (201) is provided on at least one end side of the arm support plate (2), and a slider (202) is provided on the side of each side plate (201) close to the two second slide rails (9) on the same inner side wall of the shell, and the slider (202) is slidably matched with the second slide groove (901).

5. A blood sampling and fixing device according to claim 4, characterized in that: Two second slide rails (9) are provided on the two opposite inner side walls of the shell in the transverse direction, the side panels (201) are provided on both ends of the arm support plate (2) corresponding to the second slide rails (9), and the sliders (202) are provided on both sides of the two side panels (201) close to the corresponding second slide rails (9).

6. The blood sampling and fixing device according to claim 4, characterized in that: An elastic member (11) is connected between the lower end of the second sliding groove (901) and the slider (202).

7. A blood sampling and fixing device according to claim 1 or 2, characterized in that: A connecting piece (203) is provided at the lower end of the arm support plate (2), and the first connecting rods (301) on both sides of the arm support plate (2) are hinged to the connecting piece (203) respectively.

8. A blood sampling and fixing device according to claim 1 or 2, characterized in that: The housing comprises a first housing (1) and a second housing (5); a base (4) is provided at the lower ends of the first housing (1) and the second housing (5); the first housing (1) and / or the second housing (5) are slidably connected to the base (4).

9. The blood sampling and fixing device according to claim 8, characterized in that: The upper end of the base (4) is provided with two first slide rails (6) that are symmetrical to each other in a transverse direction, and the lower end of the first shell (1) and / or the second shell (5) is provided with a first slide groove (101) corresponding to the first slide rail (6), and the first slide groove (101) is slidably matched with the first slide rail (6).

10. The blood sampling and fixing device according to claim 9, characterized in that: The first housing (1) and / or the second housing (5) are provided with limiting holes (102) on both sides close to the first slide rail (6), and fixing members (7) are provided in the limiting holes (102).

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