A gradient pressurized tourniquet after puncture in hematology department

Abstract

The present application belongs to the technical field of medical tourniquet, in particular to a gradient pressurization tourniquet for puncture post-operation in hematology department, comprising a shell, two tightening belts arranged on both sides of the shell, and magic tapes fixed on the ends of the two tightening belts away from the shell. The gradient pressurization mechanism is arranged at the bottom of the shell, and the upper end of the gradient pressurization mechanism extends to the inside of the shell and is provided with an elastic mechanism. The air extraction mechanism is arranged in the inside of the shell, and the input end of the air extraction mechanism extends to the bottom of the shell and corresponds to the position of the gradient pressurization mechanism. The air extraction mechanism can accelerate the air permeation effect of the gradient pressurization mechanism. The gradient pressurization and elastic buffering adapt to the physiological characteristics of the anterior elbow region, at the same time, the air extraction and filtration and the sterile air curtain ensure air permeation and infection prevention, the air volume is self-adaptive and adjustable to balance hemostasis and comfort, and the safety, adaptability and patient experience of post-puncture hemostasis are greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of medical tourniquet technology, and in particular relates to a gradient pressure tourniquet for post-hematological puncture procedures. Background Technology

[0002] In hematology clinical diagnosis and treatment, the antecubital vein is a common site for blood collection and puncture due to its thick and straight vein and ease of operation. After the puncture, the patient needs to apply a tourniquet to the puncture site to stop bleeding in order to avoid problems such as oozing and subcutaneous hematoma, such as the hemostatic device for hematology nursing disclosed in announcement number CN222398547U.

[0003] However, the skin in front of the elbow is thin and close to the joint. Applying uniform and large pressure around the puncture point can improve hemostasis, but it can also restrict joint movement, affecting the patient's postoperative limb comfort. It may even cause discomfort such as nerve compression and poor blood circulation due to concentrated local pressure. At the same time, prolonged pressure between the hemostasis site and the skin can hinder local air circulation, leading to sweat accumulation and poor breathability. This not only reduces the patient's wearing experience, but may also cause bacteria to grow in the humid environment. Hematology patients often have abnormal coagulation function and low immunity, and the skin barrier at the puncture point is already damaged.

[0004] Therefore, a gradient pressure tourniquet is proposed after hematological puncture. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a gradient pressure tourniquet for hematological biopsy.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a gradient pressure tourniquet for post-hematology puncture, comprising a shell and tightening straps disposed on both sides of the shell, wherein each of the tightening straps is fixedly provided with mutually cooperating Velcro at its end away from the shell, and further comprising: A gradient pressing mechanism is disposed at the bottom of the housing, and the upper end of the gradient pressing mechanism extends into the interior of the housing and is provided with an elastic mechanism; An exhaust mechanism is disposed inside the housing, and the input end of the exhaust mechanism extends to the bottom of the housing and corresponds to the position of the gradient pressing mechanism. The exhaust mechanism can accelerate the air permeability of the gradient pressing mechanism. An air volume regulating mechanism is provided on the input end of the exhaust mechanism, and the air volume regulating mechanism is used to regulate the exhaust volume of the gradient pressing mechanism. A gas filtration mechanism is disposed on the top of the housing and is connected to the output end of the exhaust mechanism. The output end of the gas filtration mechanism extends to the periphery of the gradient pressing mechanism and creates a sterile environment. A control switch is fixedly installed on the top of the housing. A storage battery is fixedly installed inside the housing. Both the ventilation mechanism and the storage battery are electrically connected to the control switch.

[0007] Preferably, the gradient pressing mechanism includes a pressing rod that is vertically slidably disposed at the bottom of the housing, a gradient pressing plate is fixedly disposed at the lower end of the pressing rod, the lower surface of the gradient pressing plate is flat in the middle, and the outer periphery of the gradient pressing plate is curved upwards, a plurality of vent holes are provided on the upper surface of the gradient pressing plate, and a hemostatic pad is fixedly adhered to the lower surface of the gradient pressing plate.

[0008] Preferably, the elastic mechanism includes a fixed plate fixedly disposed on the upper end of the pressing rod, and sliding rods are slidably disposed on both sides of the fixed plate. The upper ends of the two sliding rods are fixedly connected to the top inner wall of the housing. Springs are sleeved on the rod walls of the two sliding rods, and the two ends of the springs are fixedly connected to the upper surface of the fixed plate and the top inner wall of the housing, respectively.

[0009] Preferably, the exhaust mechanism includes an exhaust pump fixedly mounted on the inner wall of the top of the housing, a plurality of evenly distributed exhaust pipes fixedly mounted around the bottom of the housing, a pre-filter fixedly mounted inside the lower end of each of the plurality of exhaust pipes, and the lower ends of the plurality of exhaust pipes facing the gradient pressing plate, and a protective pipe fixedly mounted on the inner wall of the housing outside the exhaust pump and the plurality of exhaust pipes.

[0010] Preferably, the air volume regulating mechanism includes connecting rods that are fixedly arranged around the lower surface edge of the fixed plate, and a conical sealing head is fixedly provided at the lower end of each of the connecting rods, with the conical sealing heads extending into the upper interior of the multiple exhaust pipes respectively.

[0011] Preferably, the gas filtration mechanism includes a filter cylinder fixedly disposed on the top of the housing, a HEPA filter screen fixedly disposed inside the filter cylinder, connecting pipes fixedly disposed on the top of both sides of the filter cylinder, an annular air blowing pipe disposed around the periphery of the gradient pressing plate, a plurality of evenly distributed fixing rods fixedly disposed between the inner wall of the annular air blowing pipe and the circumferential wall of the gradient pressing plate, a plurality of evenly distributed air blowing holes being opened around the upper side of the wall of the annular air blowing pipe, and the ends of the two connecting pipes away from the filter cylinder being fixedly connected to the two sides of the annular air blowing pipe.

[0012] Preferably, the two connecting pipes pass through the inner sides of the housing respectively, and both connecting pipes are rubber hoses.

[0013] Preferably, the side wall of the housing is provided with a housing cover, and the wall of the protective tube is provided with a tube cover.

[0014] Compared with existing technologies, the advantages of this invention are as follows: 1. By setting up a gradient pressure mechanism and an elastic mechanism, the special shape of the gradient pressure disc can create a gradient pressure effect of "high pressure in the center and decreasing pressure on the periphery". This can quickly stop bleeding at the puncture point, avoid excessive local pressure, not restrict joint movement, and improve the patient's limb comfort. The cushioning effect of the elastic mechanism makes the pressure gentler and can adapt to the curvature and range of motion of the patient's arm, ensuring that the hemostatic pad always fits the puncture point, avoiding rigid pressure that could damage the skin, and is suitable for the characteristics of hematology patients with fragile blood vessels and sensitive skin.

[0015] 2. By incorporating an exhaust system and a gas filtration system, the exhaust system can quickly remove the hot and humid air between the hemostatic pad and the skin, improving local breathability, relieving stuffiness and itching, and reducing sweat accumulation and bacterial growth. The extracted gas is sterilely filtered through a HEPA filter and then forms an air curtain around the puncture point through a ring-shaped blower, isolating external bacteria and dust, creating a sterile protective ring, reducing the risk of infection, and meeting the needs of hematology patients with low immunity.

[0016] 3. By setting up an air volume adjustment mechanism, the air volume can be adaptively adjusted according to the actual pressing force of the gradient pressing mechanism: the greater the pressing force, the greater the opening of the air pipe and the greater the air volume; the smaller the pressing force, the gentler the air volume. Without additional manual operation, the ventilation effect can be accurately matched under different pressurization states, avoiding the aggravation of stuffiness or excessive ventilation affecting hemostasis, making hemostasis, ventilation and infection prevention more efficient in synergy. Attached Figure Description

[0017] Figure 1 This is a first-view perspective perspective of a gradient pressure tourniquet applied after a hematological biopsy, provided by the present invention. Figure 2 This is a two-dimensional perspective view of a gradient pressure tourniquet applied after a hematological biopsy, provided by the present invention. Figure 3 This is a three-dimensional view of the inside of the shell of a gradient pressure tourniquet after a hematological puncture procedure provided by the present invention. Figure 4 This is a three-dimensional view of the gradient pressure plate and hemostatic pad in a gradient pressure tourniquet after a hematological puncture procedure, provided by the present invention; Figure 5 This is a three-dimensional view of a gradient pressure tourniquet after a hematological puncture procedure provided by the present invention, after the top cover of the outer shell has been removed; Figure 6 This is a perspective view of the air volume adjustment mechanism in a gradient pressure tourniquet after hematological puncture provided by the present invention; Figure 7 This is a three-dimensional view of a gas filtration mechanism in a gradient pressure tourniquet after hematological puncture, provided by the present invention.

[0018] In the diagram: 1. Housing, 2. Fastening strap, 3. Velcro, 4. Gradient pressing mechanism, 41. Pressing rod, 42. Gradient pressing plate, 43. Vent hole, 44. Hemostatic pad, 5. Elastic mechanism, 51. Fixing plate, 52. Slide rod, 53. Spring, 6. Exhaust mechanism, 61. Exhaust pump, 62. Exhaust pipe, 63. Pre-filter, 64. Protective pipe, 7. Air volume adjustment mechanism, 71. Connecting rod, 72. Conical sealing head, 8. Gas filtration mechanism, 81. Filter cartridge, 82. HEPA filter, 83. Connecting pipe, 84. Annular blower pipe, 85. Fixing rod, 86. Blower hole, 9. Control switch, 10. Battery, 11. Housing cover, 12. Pipe cover. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] like Figures 1-7 As shown, a gradient pressure tourniquet for post-hematology puncture includes a housing 1 and tightening straps 2 disposed on both sides of the housing 1. Each tightening strap 2 has a matching Velcro closure 3 fixed at its end furthest from the housing 1. The tourniquet also includes: A gradient pressure mechanism 4 is located at the bottom of the housing 1. The gradient pressure mechanism 4 includes a pressure rod 41 vertically sliding at the bottom of the housing 1. A gradient pressure plate 42 is fixedly attached to the lower end of the pressure rod 41. The lower surface of the gradient pressure plate 42 has a flat center and its outer periphery curves upwards in an arc. Multiple ventilation holes 43 are provided on the upper surface of the gradient pressure plate 42. A hemostatic pad 44 is fixedly adhered to the lower surface of the gradient pressure plate 42. After each use, the hemostatic pad 44 can be removed and replaced with a new one. The upper end of the gradient pressure mechanism 4... An elastic mechanism 5 extends into the interior of the housing 1. The elastic mechanism 5 includes a fixed plate 51 fixedly mounted on the upper end of the pressing rod 41. Sliding rods 52 are slidably mounted on both sides of the fixed plate 51. The upper ends of the two sliding rods 52 are fixedly connected to the top inner wall of the housing 1. Springs 53 are sleeved on the rod walls of the two sliding rods 52. The two ends of the springs 53 are fixedly connected to the upper surface of the fixed plate 51 and the top inner wall of the housing 1, respectively. In its natural state, the springs 53 apply elastic force to the fixed plate 51, so that the pressing rod 41 extends to the outside of the housing 1 to the maximum distance.

[0021] The exhaust mechanism 6 is located inside the housing 1, and its input end extends to the bottom of the housing 1 and corresponds to the position of the gradient pressing mechanism 4. The exhaust mechanism 6 can accelerate the ventilation effect of the gradient pressing mechanism 4. The exhaust mechanism 6 includes an exhaust pump 61 fixedly installed on the inner wall of the top of the housing 1. Multiple evenly distributed exhaust pipes 62 are fixedly installed around the bottom of the housing 1. A pre-filter 63 is fixedly installed inside the lower end of each exhaust pipe 62. The pre-filter 63 is made of non-woven fabric and can be directly cleaned and reused without disassembly or replacement. The lower ends of the multiple exhaust pipes 62 are all facing the gradient pressing plate 42. A protective pipe 64 is fixedly installed on the inner wall of the housing 1 and outside the exhaust pump 61 and multiple exhaust pipes 62. A housing cover 11 is installed on the side wall of the housing 1. A pipe cover 12 is installed on the pipe wall of the protective pipe 64. By opening the housing cover 11 and the pipe cover 12, the components inside the protective pipe 64 can be maintained.

[0022] The air volume adjustment mechanism 7 is located at the input end of the exhaust mechanism 6 and is used to adjust the exhaust volume of the gradient pressing mechanism 4. The air volume adjustment mechanism 7 includes connecting rods 71 ​​that are fixedly arranged around the lower surface edge of the fixed plate 51. The lower ends of the multiple connecting rods 71 ​​are all fixed with conical sealing heads 72. The multiple conical sealing heads 72 extend into the upper end of the multiple exhaust pipes 62. The maximum diameter of the conical sealing head 72 is larger than the diameter of the exhaust pipe 62. The conical sealing head 72 is made of rubber, which has strong sealing performance and is not easily damaged.

[0023] A gas filtration mechanism 8 is located on the top of the housing 1 and is connected to the output end of the exhaust mechanism 6. The output end of the gas filtration mechanism 8 extends to the periphery of the gradient pressing mechanism 4 and creates a sterile environment. The gas filtration mechanism 8 includes a filter cylinder 81 fixedly mounted on the top of the housing 1. A HEPA filter 82 is fixedly installed inside the filter cylinder 81. A sealing cap is provided on the top of the filter cylinder 81. The HEPA filter 82 can be replaced by opening the sealing cap. Connecting pipes 83 are fixedly installed on the top of both sides of the filter cylinder 81. A gradient pressing plate 42 is provided around the periphery of the filter cylinder 81. There is an annular air blowing pipe 84. Multiple evenly distributed fixing rods 85 are fixed between the inner wall of the annular air blowing pipe 84 and the circumferential wall of the gradient pressing plate 42. Multiple evenly distributed air blowing holes 86 are opened around the upper side of the pipe wall of the annular air blowing pipe 84. The ends of two connecting pipes 83 away from the filter cylinder 81 are fixedly connected to the two sides of the annular air blowing pipe 84. The two connecting pipes 83 pass through the inner sides of the housing 1 respectively, and both connecting pipes 83 are rubber hoses. The rubber hoses can ensure that the annular air blowing pipe 84 moves up and down with the gradient pressing plate 42, avoiding damage caused by pulling.

[0024] The control switch 9 is fixedly installed on the top of the housing 1. The battery 10 is fixedly installed inside the housing 1. The side wall of the housing 1 is provided with a USB interface for charging the battery 10. The control circuit board (not shown in the figure) is also installed inside the housing 1. The ventilation mechanism 6 and the battery 10 are both electrically connected to the control switch 9.

[0025] The operating principle of this invention is described as follows: After puncturing a patient's antecubital vein, medical personnel quickly wrap two tightening bands 2 around the patient's arm, aligning the gradient pressure plate 42 with the puncture point, and then securing it with Velcro 3 at the ends of the tightening bands 2. During the securing process, the restraining force of the tightening bands 2 is transmitted to the housing 1 and the gradient pressure plate 42, causing the hemostatic pad 44 on the lower surface of the gradient pressure plate 42 to adhere to the puncture point and apply pressure to achieve hemostasis. Because the lower surface of the gradient pressure plate 42 has a flat contact surface in the middle and an upwardly curved outer periphery, this... The shape allows pressure to naturally converge towards the center, forming a concentrated and stable pressure in the core area of ​​the puncture point, while gradually decreasing towards the surrounding area away from the puncture point, creating a gradient pressure effect. This gradient pressure structure design not only quickly blocks bleeding at the puncture point through effective pressure in the core area, but also avoids the problem of excessive local pressure caused by traditional uniform pressure, greatly reducing the compression on blood vessels and nerves around the elbow area, while not restricting the freedom of joint movement, making the patient's limb movement more comfortable after surgery, and effectively avoiding poor blood circulation or limb soreness caused by joint restriction. In addition, when the hemostatic pad 44 on the lower surface of the gradient pressure plate 42 contacts the patient's puncture point in front of the elbow, under the action of external force, the pressing rod 41 will move a distance into the housing 1, causing the fixed plate 51 at its upper end to slide smoothly along the sliding rods 52 on both sides and compress the spring 53. The buffering effect of the spring 53 can make the pressure of the hemostatic pad 44 more gentle, avoiding secondary damage to the thin skin in front of the elbow area caused by rigid pressing. It is especially suitable for the characteristics of hematology patients with fragile blood vessels and sensitive skin barrier. At the same time, the elastic buffer design can adapt to the physiological curvature and range of motion of the patient's arm. Even if the patient slightly adjusts the limb posture, the hemostatic pad 44 can always fit tightly in the puncture point and maintain a stable pressure effect, preventing pressure deviation or hemostasis failure due to changes in body position. In addition, the gentle elastic feedback can also improve the patient's wearing comfort and reduce the discomfort caused by long-term pressing. After the tightening strap 2 is wrapped and secured, medical staff start the exhaust pump 61 by operating the control switch 9. When the exhaust pump 61 is working, it quickly extracts the gas inside the protective tube 64 to create a stable negative pressure environment. Then, multiple sets of suction tubes are used to extract air into the gradient pressure plate 42 area. Each suction tube opening is equipped with a pre-filter 63, which can pre-filter the inhaled air, intercepting large particles such as dust and hair, and preventing contaminants from entering the interior of the housing 1. The surface of the gradient pressure plate 42 has multiple evenly distributed ventilation holes 43. The airflow generated by the suction can flow smoothly through these vents 43, quickly removing the hot and humid air between the hemostatic pad 44 and the skin, thoroughly improving the local stuffy and humid condition, significantly improving the breathability around the puncture point, effectively relieving skin itching and stuffy discomfort caused by prolonged pressure, improving patient tolerance, reducing sweat accumulation around the puncture point, avoiding the growth of bacteria in a humid environment, and at the same time, the airflow circulation can help keep the skin dry, protect the already fragile skin barrier of hematology patients, reduce the risk of infection, and make the hemostasis process safer and more comfortable; In addition, the gas extracted by the exhaust pump 61 will be discharged into the filter cartridge 81 and undergo efficient sterile filtration through the HEPA filter 82 inside the filter cartridge 81, completely intercepting harmful impurities such as bacteria and microorganisms contained in the gas, ensuring the cleanliness of the discharged gas. The filtered sterile gas is discharged through the connecting pipes 83 on both sides of the filter cartridge 81 and finally flows into the annular blowing pipe 84. Then, through multiple air blowing holes opened on the annular blowing pipe 84, it is evenly blown out to the upper and lower periphery of the gradient pressure plate 42, forming an invisible annular air curtain. This air curtain can effectively isolate bacteria, dust and other pollutants in the outside air, build a sterile protective ring around the puncture point, and prevent external pollutants from contacting the gradient pressure plate 42 and the patient's puncture and pressing site from the source. When the pressing rod 41 moves into the housing 1, the fixed plate 51 connected to it will push upward in sync, thereby driving multiple connecting rods 71 ​​and the conical sealing head at the end to move upward together, so that the conical sealing head moves out from the upper end of the corresponding exhaust pipe 62, ensuring that the air passage inside the exhaust pipe 62 is unobstructed and that the exhaust function is carried out smoothly. During the process of medical staff wrapping the fixation bandage 2, differences in operational details may lead to inconsistent looseness of the two bandages 2. This will directly cause a difference in the squeezing force between the gradient pressure plate 42 and the patient's puncture site, resulting in different lengths of movement of the pressure rod 41 into the housing 1. Correspondingly, the upward movement height of the fixing plate 51, the connecting rod 71, and the conical sealing head will also change accordingly, ultimately achieving dynamic adjustment of the opening degree of the exhaust pipe 62. When the pressure exerted between the gradient pressure plate 42 and the puncture site is greater, the upward movement height of the pressure rod 41 and the fixed plate 51 is greater. The upward movement distance of the conical sealing head driven by the connecting rod 71 also increases, resulting in a larger opening at the upper end of the exhaust pipe 62. This significantly enhances the suction strength of the exhaust pipe 62 on the gradient pressure plate 42 and the puncture site. Conversely, if the pressure exerted between the gradient pressure plate 42 and the puncture site is smaller, the upward movement height of the pressure rod 41 and the fixed plate 51 will decrease accordingly, the upward movement distance of the conical sealing head will shorten, the opening degree of the upper end of the exhaust pipe 62 will decrease, and the suction strength will be gently reduced. This dynamic adaptation design offers several advantages: Firstly, it can automatically adjust the suction intensity according to the actual fixation state of the tightening band 2 and the pressure of the puncture point, so as to ensure that the area around the puncture point can obtain a suitable ventilation effect under different compression forces, and avoid the local stuffiness caused by excessive compression force or the excessive ventilation caused by insufficient compression force, which affects the stability of hemostasis. Secondly, when the squeezing pressure is greater, the ventilation intensity is increased, which can more efficiently remove the hot and humid air generated by the tight pressure, further reduce sweat accumulation, reduce the risk of infection, and at the same time relieve patient discomfort. This allows for a more precise synergistic effect of hemostasis, ventilation and infection prevention, fully meeting the personalized care needs of hematology patients after puncture.

[0026] 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 gradient pressure tourniquet for post-hematology puncture, comprising a housing (1) and tightening straps (2) disposed on both sides of the housing (1), wherein each of the two tightening straps (2) is fixedly provided with mutually cooperating Velcro (3) at one end away from the housing (1), characterized in that, Also includes: A gradient pressing mechanism (4) is provided at the bottom of the housing (1), and the upper end of the gradient pressing mechanism (4) extends into the interior of the housing (1) and is provided with an elastic mechanism (5). The exhaust mechanism (6) is located inside the housing (1), and the input end of the exhaust mechanism (6) extends to the bottom of the housing (1) and corresponds to the position of the gradient pressing mechanism (4). The exhaust mechanism (6) can accelerate the air permeability of the gradient pressing mechanism (4). An air volume adjustment mechanism (7) is provided on the input end of the exhaust mechanism (6), and the air volume adjustment mechanism (7) is used to adjust the exhaust volume of the gradient pressing mechanism (4); A gas filtration mechanism (8) is disposed on the top of the housing (1) and is connected to the output end of the exhaust mechanism (6). The output end of the gas filtration mechanism (8) extends to the periphery of the gradient pressing mechanism (4) and creates a sterile environment. A control switch (9) is fixedly installed on the top of the housing (1). A storage battery (10) is fixedly installed inside the housing (1). The ventilation mechanism (6) and the storage battery (10) are both electrically connected to the control switch (9).

2. The gradient pressure tourniquet for post-hematology puncture surgery according to claim 1, characterized in that, The gradient pressing mechanism (4) includes a pressing rod (41) that is vertically slidably disposed at the bottom of the housing (1). The lower end of the pressing rod (41) is fixedly provided with a gradient pressing plate (42). The lower surface of the gradient pressing plate (42) is flat in the middle, and the outer periphery of the gradient pressing plate (42) is curved upward. The upper surface of the gradient pressing plate (42) is provided with a plurality of vent holes (43). The lower surface of the gradient pressing plate (42) is fixedly bonded with a hemostatic pad (44).

3. The gradient pressure tourniquet for post-hematology puncture surgery according to claim 2, characterized in that, The elastic mechanism (5) includes a fixed plate (51) fixedly disposed on the upper end of the pressing rod (41). Slide rods (52) are slidably disposed on both sides of the fixed plate (51). The upper ends of the two slide rods (52) are fixedly connected to the top inner wall of the housing (1). Springs (53) are sleeved on the rod walls of the two slide rods (52), and the two ends of the springs (53) are fixedly connected to the upper surface of the fixed plate (51) and the top inner wall of the housing (1) respectively.

4. The gradient pressure tourniquet for post-hematology puncture surgery according to claim 3, characterized in that, The exhaust mechanism (6) includes an exhaust pump (61) fixedly installed on the inner wall of the top of the housing (1). A plurality of evenly distributed exhaust pipes (62) are fixedly arranged around the bottom of the housing (1). A pre-filter (63) is fixedly installed inside the lower end of each of the plurality of exhaust pipes (62), and the lower ends of the plurality of exhaust pipes (62) are all facing the gradient pressing plate (42). A protective pipe (64) is fixedly installed on the inner wall of the housing (1) and outside the exhaust pump (61) and the plurality of exhaust pipes (62).

5. A gradient pressure tourniquet for post-hematology puncture surgery according to claim 4, characterized in that, The air volume regulating mechanism (7) includes a connecting rod (71) fixedly arranged around the edge of the lower surface of the fixed plate (51). The lower ends of the multiple connecting rods (71) are fixedly provided with conical sealing heads (72), and the multiple conical sealing heads (72) extend to the upper interior of the multiple exhaust pipes (62).

6. A gradient pressure tourniquet for post-hematology puncture surgery according to claim 2, characterized in that, The gas filtration mechanism (8) includes a filter cylinder (81) fixedly installed on the top of the housing (1). A HEPA filter screen (82) is fixedly installed inside the filter cylinder (81). Connecting pipes (83) are fixedly installed on the top of both sides of the filter cylinder (81). An annular air blowing pipe (84) is provided around the gradient pressing plate (42). Multiple evenly distributed fixing rods (85) are fixed between the inner wall of the annular air blowing pipe (84) and the circumferential wall of the gradient pressing plate (42). Multiple evenly distributed air blowing holes (86) are opened around the upper side of the pipe wall of the annular air blowing pipe (84). The ends of the two connecting pipes (83) away from the filter cylinder (81) are fixedly connected to the two sides of the annular air blowing pipe (84).

7. A gradient pressure tourniquet for post-hematology puncture surgery according to claim 6, characterized in that, The two connecting pipes (83) pass through the inside sides of the housing (1) respectively, and both connecting pipes (83) are rubber hoses.

8. A gradient pressure tourniquet for post-hematological biopsy as described in claim 4, characterized in that, The side wall of the housing (1) is provided with a housing cover (11), and the wall of the protective tube (64) is provided with a tube cover (12).

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