Arm blood sampling fixing device

Abstract

The present invention discloses an arm blood sampling fixing device, belonging to the field of medical devices, including: a support, provided with a telescopic rod; a pad, the pad has a placement groove, the pad includes an upper arm section and a forearm section, the pad is rotatably connected to the support, one end of the telescopic rod abuts against the pad, and the telescopic rod drives the pad to approach or move away from the placement surface of the support when it is extended; a pressing plate, the pressing plate is movably connected to the forearm section, the pressing plate is provided with a connecting shaft 1, and the pressing plate approaches or moves away from the placement groove when it rotates around the connecting shaft 1; a binding assembly, including two receiving boxes mirror-set on both sides of the upper arm section, one of the receiving boxes is provided with a reset member and a compression cuff, the compression cuff includes a free end outside the receiving box, the compression cuff and the pad form a closed loop when the free end is connected to the other receiving box, and the free end moves to an initial position under the drive of the reset member when it is separated from the other receiving box. Through the above arrangement, the present invention can effectively fix the patient's arm and squeeze the blood drawing site to expose the blood vessel during the blood drawing process.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to an arm blood sampling and fixing device. Background Art

[0002] In the process of clinical diagnosis and treatment, it is often necessary to draw blood samples from patients. Among them, the blood samples of hospitalized patients are drawn by medical staff in the ward with a blood drawing cart. However, when drawing blood in the ward, due to the different heights of patients, it is difficult for different patients to maintain the same horizontal height or angle when leaning their arms on the blood drawing cart. This causes patients to often need to support the other arm with one arm when drawing blood, and it is easy to shake during the support process, so there is a risk of wrong insertion position or blood drawing needle falling off; during the blood drawing process, the nurse needs to press the lower arm hard to find the blood vessel, but when drawing blood, one hand needs to hold the needle and the other hand to hold the bandage. At this time, the hand pressing the lower arm will be loosened, and the blood vessel will become less obvious when the needle is inserted. Therefore, the nurse cannot take into account the blood vessel compression, blood collection needle placement and wound compression during the blood drawing process; the thickness of the current compression cuff is equivalent to that of the little finger, the force acting area is small and it may cause some patients to feel pain. In addition, each time a patient is drawn, the process of tying, untying and throwing the cuff must be carried out, which makes the process complicated when there are many patients.

[0003] Therefore, a device is designed to fix the patient's arm posture and press the patient's arm when drawing blood. This device is specifically an arm blood collection fixing device. Summary of the invention

[0004] In order to overcome the problems raised in the background technology, the present invention adopts the following technical solutions:

[0005] 14. The blood sampling fixing device of claim 13, wherein the support frame is provided with a telescopic rod; a pad having a placement groove, an inner wall of the placement groove having an arc, the pad comprising an upper arm section and a forearm section, the upper arm section and the forearm section having an included angle, the pad being rotatably connected to the support, one end of the telescopic rod abutting against the pad, and the telescopic rod driving the pad approaching or moving away from the placement surface of the support when it is extended or retracted; a pressing plate, the pressing plate being movably connected to the forearm section and capable of reciprocating along the central axis of the forearm section, the pressing plate being provided with a connecting shaft 1, and the pressing plate approaching or moving away from the placement groove when it rotates around the connecting shaft 1; a tightening assembly comprising two receiving boxes mirror-arranged on both sides of the upper arm section, one of the receiving boxes being provided with a reset member and a compression band, the compression band comprising a free end that is always outside the receiving box, the compression band and the pad forming a closed loop when the free end is connected to the other receiving box, and the free end moving to an initial position under the drive of the reset member when it is separated from the other receiving box. The pressing plate can reciprocate along the central axis of the portion of the placement slot located in the forearm section, so as to be able to move to various parts of the patient's forearm, and at the same time, the pressing plate can rotate around the connecting axis 1, so as to be able to pass close to the placement slot. When in use, the patient's arm is placed in the placement slot, and the medical staff can adjust the degree of compression of the pressing plate on the patient's arm by controlling the rotation angle of the pressing plate around the connecting axis 1, and can also adjust the compression position of the pressing plate on the patient's arm by controlling the relative position relationship between the pressing plate and the pad.

[0006] Furthermore, a travel groove 1 is mirror-imaged on the forearm section of the pad, there are two connecting shafts 1, the central axes of the two connecting shafts 1 coincide, the two connecting shafts 1 are respectively rotatably connected to a slider, the sliders are slidably connected to the travel groove 1 correspondingly one by one, and the axial direction of the connecting shaft 1 is perpendicular to the movement direction of the slider.

[0007] Furthermore, the storage box includes a box body 1 and a box body 2, a rotating shaft is arranged inside the box body 1, the compression belt part is wound around the rotating shaft, and the two ends of the reset member are respectively connected to the rotating shaft and the inner wall of the box body 1; when the free end of the compression belt moves toward the box body 2, the rotating shaft rotates around its own axis and drives the reset member to rotate and store energy; when the free end of the compression belt is separated from the box body 2, the reset member releases energy and drives the rotating shaft to rotate, and the free end of the compression belt is reset to the initial position driven by the rotating shaft. The interior of the box body 1 and the box body 2 has the same cavity, and the box body 1 and the box body 2 are snapped or plugged on the outer wall of the pad, which is conducive to the rapid replacement of the storage box that cannot function normally.

[0008] Furthermore, the box body 1 and the box body 2 are both rotatably connected with a limiting clamp, the outer wall of the box body 1 is provided with a protruding opening, the outer wall of the box body 2 is provided with an inserting opening, and the limiting clamp blocks the protruding opening and the inserting opening respectively when not subject to external force. The protruding opening connects the cavity in the box body 1 with the external environment, and the inserting opening connects the cavity in the box body 2 with the external environment. The cavity in the box body 2 is used to accommodate the free end, so that the cuff can tighten the patient's arm on the pad. Since the placement groove in the pad has an arc, the arc and the tightened cuff can form a semi-cylindrical closed loop, so as to ensure that the cuff is pressed tightly on the patient's arm.

[0009] Furthermore, the free end is connected to a limiting rod, the width of the extension port is smaller than the inner diameter of the limiting rod, and the limiting clamp limits the movement of the limiting rod when the free end is in an initial position; the width of the extension port is larger than the inner diameter of the limiting rod, and the limiting clamp limits the movement of the limiting rod when the limiting rod enters the box body two through the extension port.

[0010] Furthermore, the telescopic rod includes a fixed section and a moving section, the fixed section is provided with a threaded hole inside, the moving section is provided with an external thread on an outer wall, the moving section is bolted to the fixed section; and a knob is provided around the moving section.

[0011] Furthermore, a second travel groove is provided at the bottom end of the pad, and the telescopic rod extends into the second travel groove toward one end of the pad and abuts against the inner wall of the second travel groove; when the telescopic rod is extended or retracted, the end of the telescopic rod toward the pad reciprocates in the second travel groove.

[0012] Furthermore, a limiting groove is provided on the outer wall of the pad, and a pressure rod is connected to one of the connecting shafts of the pressure plate, and the pressure rod is slidably connected to a limiting pin, and the central axis of the limiting pin is parallel to the central axis of the connecting shaft. When the limiting pin enters the limiting groove along its own axial direction, it limits the rotation of the pressure plate around the connecting shaft.

[0013] Furthermore, a second connecting shaft is mirror-imaged on the support, and the support is rotatably connected to the pad via the second connecting shaft.

[0014] Furthermore, an elastic pad is provided on the inner wall of the pressing plate facing the placement groove.

[0015] Beneficial effects of the present invention:

[0016] 1. By setting a support with a telescopic rod and a pad with a placement groove, the support and the pad are rotatably connected. When in use, the angle of the pad relative to the desktop, the upper end surface of the blood drawing vehicle or other placement surfaces can be adjusted arbitrarily, and the angle between the pad and the placement surface can be locked by adjusting the axial length of the telescopic rod, thereby preventing shaking during the support process, which is beneficial to reduce the risk of incorrect insertion position or detachment of the blood drawing needle during blood drawing.

[0017] 2. By setting a slider that is rotatably and slidingly connected to the forearm section of the pad, the slider is rotatably connected to the pressure plate around a connecting axis, so that the pressure plate can reciprocate along the central axis of the forearm section while also rotating around the connecting axis, which can simulate the medical staff's hand squeezing the patient's arm, and then by setting a limit slide groove and a limit pin that are plugged in and connected, the position of the pressure plate can be locked after the pressure plate presses the patient's arm, thereby reducing the operating burden of the medical staff and helping to improve the blood drawing efficiency of the medical staff.

[0018] 3. By arranging a box body 1 with a cuff and a reset piece on one side of the pad, and arranging a box body 2 capable of fixing the cuff on the other side of the pad, medical staff can conveniently pull the cuff out of the box body 1 and put it into the box body 2, so that the pad and the cuff surround and compress the patient's arm. When the limit clamp is removed after blood drawing, the cuff returns to the initial position driven by the reset piece, which is conducive to simplifying the complex operations of medical staff when tightening and removing the existing cuff and reducing the fatigue of medical staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0020] Figure 1 It is a schematic diagram of one overall structure of the present invention when the free end is in the initial position;

[0021] Figure 2 for Figure 1 A schematic diagram of the local enlarged structure at point A in the middle;

[0022] Figure 3 for Figure 2 A schematic cross-sectional structure diagram of ;

[0023] Figure 4 for Figure 1 A schematic diagram of the local enlarged structure at B in the middle;

[0024] Figure 5 for Figure 4 A schematic cross-sectional structure diagram of ;

[0025] Figure 6 It is a schematic diagram of one overall structure of the present invention when the free end is in the initial position;

[0026] Figure 7 for Figure 6 A schematic diagram of the local enlarged structure at C in the middle;

[0027] Figure 8 for Figure 7 A schematic cross-sectional structure diagram of ;

[0028] Fig. 9 It is a schematic diagram of the overall structure of the present invention when the free end is in the initial position and the limit clamp is away from the extension opening and the extension opening;

[0029] Fig.10 It is a schematic diagram of one of the overall structures of the present invention when the free end leaves the initial position and moves toward the second box body;

[0030] Fig.11 It is a schematic diagram of one of the overall structures of the present invention when the free end leaves the initial position and moves toward the second box body;

[0031] Fig.12 for Fig.11 A schematic diagram of the local enlarged structure at D in the middle;

[0032] Fig.13 is a structural schematic diagram of the support;

[0033] Fig.14 It is a structural schematic diagram when the pressure plate is not equipped with a slider;

[0034] In the figure, 1, support; 11, telescopic rod; 111, fixed section; 112, moving section; 1121, knob; 12, connecting shaft 2; 2, pad; 21, placement slot; 22, upper arm section; 23, forearm section; 231, travel slot 1; 24, travel slot 2; 25, limit slide slot; 3, pressure plate; 31, connecting shaft 1; 32, slider; 33, pressure rod; 34, limit pin; 35, elastic pad; 4, tightening assembly; 41, storage box; 41a, box body 1; 411, rotating shaft; 412, extension port; 413, compression cuff; 4131, free end; 4132, limit rod; 41b, box body 2; 414, extension port; 415, reset member; 42, limit clamp. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention are described clearly and completely below through specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation methods. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] An arm blood sampling fixing device, such as Figure 1-14 As shown, it includes: a support 1, which is provided with a telescopic rod 11; a pad 2, the pad 2 has a placement groove 21, the inner wall of the placement groove 21 has an arc, the pad 2 includes an upper arm section 22 and a forearm section 23, the upper arm section 22 and the forearm section 23 have an included angle, the pad 2 is rotatably connected to the support 1, one end of the telescopic rod 11 abuts against the pad 2, and the telescopic rod 11 drives the pad 2 to approach or move away from the placement surface of the support 1 when it is extended and retracted; a pressing plate 3, the pressing plate 3 is movably connected to the forearm section 23 and can reciprocate along the central axis of the forearm section 23, and the pressing plate 3 is provided with a connecting shaft- 31, the pressing plate 3 approaches or moves away from the placement slot 21 when rotating around the connecting shaft 1 31; the binding assembly 4 includes two storage boxes 41 mirror-set on both sides of the upper arm section 22, one of the storage boxes 41 is provided with a reset member 415 and a compression band 413, the compression band 413 includes a free end 4131 that is always outside the storage box 41, the compression band 413 and the pad 2 form a closed loop when the free end 4131 is connected to the other storage box 41, and the free end 4131 moves to an initial position under the drive of the reset member 415 when it is separated from the other storage box 41. The pressing plate 3 can reciprocate along the central axis of the placement slot 21 in the forearm section 23, so that it can move to various places of the patient's forearm, and at the same time, the pressing plate 3 can rotate around the connecting shaft 1 31, so that it can pass close to the placement slot 21. When in use, the patient's arm is placed in the placement slot 21, and the medical staff can adjust the degree of pressure of the pressing plate 3 on the patient's arm by controlling the rotation angle of the pressing plate 3 around the connecting axis 31, and can also adjust the pressing position of the pressing plate 3 on the patient's arm by controlling the relative position relationship between the pressing plate 3 and the pad 2.

[0037] In some embodiments of the present application, Figure 1-14 As shown, the front arm section 23 of the pad 2 is mirror-imaged with a travel groove 231, there are two connecting shafts 31, the central axes of the two connecting shafts 31 coincide, the two connecting shafts 31 are rotatably connected to a slider 32 respectively, the sliders 32 are slidably connected to the travel groove 231 one by one, and the axial direction of the connecting shaft 31 is perpendicular to the movement direction of the slider 32.

[0038] In some embodiments of the present application, Figure 1-14 As shown, the storage box 41 includes a box body 1 41a and a box body 2 41b. A rotating shaft 411 is arranged inside the box body 1 41a. The compression belt 413 is partially wound around the rotating shaft 411. The two ends of the reset member 415 are respectively connected to the rotating shaft 411 and the inner wall of the box body 1 41a. When the free end 4131 of the compression belt 413 moves toward the box body 2 41b, the rotating shaft 411 rotates around its own axis and drives the reset member 415 to rotate and store energy. When the free end 4131 of the compression belt 413 is separated from the box body 2 41b, the reset member 415 releases energy and drives the rotating shaft 411 to rotate. The free end 4131 of the compression belt 413 is reset to the initial position driven by the rotating shaft 411. The interior of the box body 1 41a and the box body 2 41b has the same cavity. The box body 1 41a and the box body 2 41b are clamped or plugged on the outer wall of the pad 2, which is conducive to quickly replacing the storage box 41 that cannot function normally.

[0039] In some embodiments of the present application, Figure 1-14 As shown, both the box body 1 41a and the box body 2 41b are rotatably connected with the limit clamp 42, the outer wall of the box body 1 41a is provided with a protrusion port 412, and the outer wall of the box body 2 41b is provided with a protrusion port 414. When the limit clamp 42 is not subjected to external force, the protrusion port 412 and the protrusion port 414 are respectively blocked. The protrusion port 412 connects the cavity in the box body 1 41a with the external environment, and the protrusion port 414 connects the cavity in the box body 2 41b with the external environment. The cavity in the box body 2 41b is used to accommodate the free end 4131, so that the compression cuff 413 tightens the patient's arm on the pad 2. Since the placement groove 21 in the pad 2 has an arc, the arc and the tightened compression cuff 413 can form a semi-cylindrical closed loop, so as to ensure that the compression cuff 413 is pressed tightly on the patient's arm. When in use, first move the limiting clips 42 on the two side receiving boxes 41 away from the insertion opening 414 and the extension opening 412, then pull out the compression cuff 413 and put the free end 4131 directly into or wrap the patient's arm for one week and then put it into the insertion opening 414, after the free end 4131 enters the insertion opening 414, first reset the limiting clip 42 on the box body 41b to the position blocking the insertion opening 414, then pull the compression cuff 413 into the box body 1 41a according to the dimension of the patient's arm, so that the compression cuff 413 can be more tightly wrapped around the patient's upper arm, after the adjustment is completed, reset the limiting piece connected to the box body 1 41a to the position blocking the extension opening 412, so as to complete the limitation of the two sides of the compression cuff 413 through the actual effect of the limiting piece. After the blood drawing is completed, the medical staff rotates the limiting parts on the two side receiving boxes 41 in turn to expose the extension port 414 and the extension port 412, so that the compression cuff 413 can be reset under the drive of the reset part 415. The reset part 415 is specifically a soft strip of elastic rubber or a metal coil spring.

[0040] In some embodiments of the present application, Figure 1-14As shown, the free end 4131 is connected to the limiting rod 4132, the width of the extension port 412 is smaller than the inner diameter of the limiting rod 4132, and the limiting clip 42 limits the movement of the limiting rod 4132 when the free end 4131 is in the initial position, so as to prevent the free end 4131 from retracting into the interior of the box body 1 41a driven by the reset member 415. The width of the extension port 414 is larger than the inner diameter of the limiting rod 4132, and the limiting clip 42 limits the movement of the limiting rod 4132 when the limiting rod 4132 enters the box body 2 41b through the extension port 414. When the limiting clip 42 rotates and blocks the extension port 414 and the extension port 412, the vertical distance between one end of the limiting clip 42 facing the receiving box 41 and the receiving box 41 is smaller than the thickness of the compression cuff 413, and when the free end 4131 extends out of the extension port 412 to any length, the limiting clip 42 that rotates and squeezes the compression cuff 413 can fix the length of the cuff 413 extending out. Similarly, when the length of the portion of the cuff 413 extending from the first box body 41a is fixed by the limit clip 42, the limit rod 4132 passes through the insertion port 414 and drives the cuff 413 to enter the second box body 41b to adjust the length of the cuff 413 exposed to the outside. When the limit clip 42 on the second box body 41b rotates and blocks the insertion port 414, the length of the cuff 413 between the insertion port 414 and the extension port 412 is fixed. In this way, the tightness of the cuff 413 can be quickly adjusted, so that the upper arm of patients of different body shapes can be quickly and conveniently tied before blood drawing. The pad 2 is elastic, and when the cuff 413 is tightened, the curvature of the placement slot 21 in the pad 2 can be adjusted according to the arm circumference of patients of different body shapes, so that it fits the patient's arm better.

[0041] In some embodiments of the present application, Figure 1-14 As shown, the telescopic rod 11 includes a fixed section 111 and a moving section 112. The fixed section 111 is provided with a threaded hole inside, and the outer wall of the moving section 112 is provided with an external thread. The moving section 112 is bolted to the fixed section 111, and a knob 1121 is provided around the moving section 112. The user can drive the moving section 112 to extend into or out of the fixed section 111 by turning the knob 1121. The threaded connection is conducive to improving the accuracy of the length adjustment, and can be adapted to more patients with different blood drawing postures while being convenient for the user to operate.

[0042] In some embodiments of the present application, Figure 1-14As shown, the bottom end of the pad 2 is provided with a second stroke groove 24, and the telescopic rod 11 extends into the second stroke groove 24 toward one end of the pad 2 and abuts against the inner wall of the second stroke groove 24; when the telescopic rod 11 is extended and retracted, the end of the telescopic rod 11 toward the pad 2 reciprocates in the second stroke groove 24. The pad 2 can rotate around the second connecting shaft 12 while the telescopic rod 11 supports the lifting. At the same time, the support 1 is mirror-imaged with the second connecting shaft 12, and the support 1 is rotatably connected to the pad 2 through the second connecting shaft 12. Since the top of the telescopic rod 11 is constantly away from the second connecting shaft 12 when the pad 2 rotates, the setting of the second stroke groove 24 can ensure that the telescopic rod 11 is always in contact with the pad 2 and does not affect the rotation of the pad 2. An elastic pad 35 is provided on the inner wall of the pressing plate 3 facing the placement groove 21, and the material of the elastic pad 35 is silicone or latex. This setting is conducive to reducing the discomfort caused to the patient when the pressing plate 3 presses the patient's skin.

[0043] In some embodiments of the present application, Figure 1-14 As shown, a limiting groove 25 is provided on the outer wall of the pad 2, and a pressure rod 33 is connected to one of the connecting shafts 31 of the pressure plate 3. The pressure rod 33 is slidably connected to a limiting pin 34. The central axis of the limiting pin 34 is parallel to the central axis of the connecting shaft 31. When the limiting pin 34 enters the limiting groove 25 along its own axial direction, it limits the rotation of the pressure plate 3 around the connecting shaft 31.

Claims

1. An arm blood sampling and fixing device, characterized in that: include: A support, provided with a telescopic rod; A pad, the pad having a placement groove, the inner wall of the placement groove having an arc, the pad including an upper arm section and a forearm section, the upper arm section and the forearm section having an included angle, the pad being rotatably connected to the support, one end of the telescopic rod abutting against the pad, and the telescopic rod driving the pad to approach or move away from the placement surface of the support when extending and retracting; A pressing plate, the pressing plate is movably connected to the forearm section and can reciprocate along the central axis of the forearm section, the pressing plate is provided with a connecting shaft 1, and the pressing plate approaches or moves away from the placement groove when rotating around the connecting shaft 1; The binding assembly comprises two receiving boxes arranged in mirror images on both sides of the upper arm section, wherein a reset member and a compression band are arranged in one of the receiving boxes, the compression band comprises a free end which is always outside the receiving box, the compression band and the pad form a closed loop when the free end is connected to the other receiving box, and the free end moves to an initial position under the driving of the reset member when it is separated from the other receiving box; A limiting slide groove is arranged on the outer wall of the pad, one of the connecting shafts 1 of the pressure plate is connected with a pressure rod, the pressure rod is slidably connected with a limiting pin, and when the limiting pin enters the limiting slide groove along its own axial direction, the rotation of the pressure plate around the connecting shaft 1 is limited; The storage box comprises a box body 1 and a box body 2, both of which are rotatably connected to a limiting clamp, an extension opening is provided on the outer wall of the box body 1, and an extension inlet is provided on the outer wall of the box body 2, and the limiting clamp respectively blocks the extension opening and the extension inlet when not subject to external force; the vertical distance between one end of the limiting clamp facing the storage box and the storage box is less than the thickness of the compression cuff, and when the free end extends out of the extension opening to any length, the limiting clamp that rotates and squeezes the compression cuff can fix the extended length of the compression cuff.

2. The arm blood sampling fixing device according to claim 1, characterized in that: The forearm section of the pad is mirror-imaged with a travel groove 1, the number of the connecting shafts 1 is two, the central axes of the two connecting shafts 1 coincide, the two connecting shafts 1 are respectively rotatably connected to a slider, the sliders are slidably connected to the travel groove 1 correspondingly one by one, and the axial direction of the connecting shaft 1 is perpendicular to the movement direction of the slider.

3. The arm blood sampling fixing device according to claim 1, characterized in that: A rotating shaft is provided in the box body one, the compression belt part is wound around the rotating shaft, and the two ends of the reset member are respectively connected to the rotating shaft and the inner wall of the box body one; when the free end of the compression belt moves toward the box body two, the rotating shaft rotates around its own axis and drives the reset member to rotate and store energy; when the free end of the compression belt is separated from the box body two, the reset member releases energy and drives the rotating shaft to rotate, and the free end of the compression belt is reset to the initial position driven by the rotating shaft.

4. The arm blood sampling and fixing device according to claim 3, characterized in that: The free end is connected to a limiting rod, the width of the extension opening is smaller than the inner diameter of the limiting rod, and the limiting clamp limits the movement of the limiting rod when the free end is in an initial position; the width of the extension opening is larger than the inner diameter of the limiting rod, and the limiting clamp limits the movement of the limiting rod when the limiting rod enters the box body 2 through the extension opening.

5. The arm blood sampling fixing device according to claim 1, characterized in that: The telescopic rod comprises a fixed section and a moving section, wherein a threaded hole is arranged inside the fixed section, an external thread is arranged on the outer wall of the moving section, and the moving section is bolted to the fixed section; a knob is arranged around the moving section.

6. The arm blood sampling fixing device according to claim 1, characterized in that: A second travel groove is provided at the bottom end of the pad, and the telescopic rod extends into the second travel groove toward one end of the pad and abuts against the inner wall of the second travel groove; when the telescopic rod is extended or retracted, the end of the telescopic rod toward the pad reciprocates in the second travel groove.

7. The arm blood sampling and fixing device according to claim 2, characterized in that: The central axis of the limiting pin is parallel to the central axis of the connecting shaft 1.

8. The arm blood sampling and fixing device according to claim 7, characterized in that: A second connecting shaft is mirror-imaged on the support, and the support is rotatably connected to the pad via the second connecting shaft.

9. The arm blood sampling and fixing device according to claim 1, characterized in that: An elastic pad is arranged on the inner wall of the pressing plate facing the placement groove.

Images