Skin tensioning device for thoracocentesis

Abstract

The invention provides a thoracocentesis skin tensioning device which comprises a mounting frame, a mounting plate connected through a mounting mechanism is arranged on the mounting frame, a movable seat is arranged on the mounting plate, two traction mechanisms are arranged at the bottom of the movable seat, and each traction mechanism comprises two tensioning assemblies sliding relatively. The movable seat is provided with a first driving mechanism connected with the two tensioning assemblies in each traction mechanism, the two tensioning assemblies are driven by the first driving mechanism to slide in the opposite directions, the sliding direction of the two tensioning assemblies is perpendicular to the sliding direction of the traction mechanisms, and the movable seat is further provided with a second driving mechanism connected with the two traction mechanisms. And the two groups of traction mechanisms are driven by the second driving mechanism to slide in opposite directions. According to the skin tensioning device, the skin can be tensioned transversely and longitudinally, so that the skin is effectively prevented from wrinkling in the vertical direction after being tensioned in a single direction, the skin is in a tensioned state in multiple directions, and the subsequent puncture effect is improved.

Description

Technical Field

[0001] The present invention specifically relates to a skin tightening device for thoracentesis. Background Art

[0002] Thoracentesis is a common diagnostic and therapeutic technique widely used in clinical scenarios such as pleural effusion drainage and pneumothorax treatment. However, skin folds not only cause the skin surface at the puncture site to be uneven, increasing the difficulty of puncture needle positioning, but also may cause the puncture path to deviate, reducing the accuracy and success rate of puncture. In addition, the presence of skin folds may also affect the control of the angle and depth of the puncture needle entering the chest cavity. When performing thoracentesis, in order to ensure that the puncture needle can accurately and safely enter the target position, it is usually necessary to use a skin tightening device to pre-treat the skin at the puncture site to reduce the impact of skin relaxation and folds on puncture accuracy.

[0003] For example, the Chinese invention patent with the publication number CN113729986B provides a skin tightening device for thoracentesis in the respiratory department. This device locks the expansion mechanism after expansion through a driving locking mechanism, avoiding the phenomenon of skin relaxation caused by the contraction of the expansion mechanism during puncture by medical staff, improving the success rate of puncture, and the housing can be placed on the patient through a support plate, eliminating the need for personnel to hold the device, and only one person can operate it, and it also avoids blocking the medical staff's line of sight.

[0004] However, most of the existing skin tightening devices adopt a single-direction tightening method, such as pulling the skin along a straight line direction. Although this single-direction tightening method can tighten the skin to a certain extent, since the skin is an elastic and ductile tissue, when only applying tension in a single direction, folds will still appear in the direction perpendicular to the tightening direction of the skin, thus affecting the subsequent puncture effect. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the present invention proposes a skin tightening device for thoracentesis to solve the technical problem that most of the existing skin tightening devices can only tighten the skin in a single direction, and this tightening method will still cause folds in the direction perpendicular to the tightening direction of the skin, affecting the subsequent puncture effect as mentioned in the above background art.

[0006] To achieve the above object, the present invention provides the following technical solution. A skin tightening device for thoracentesis includes: Mounting frame; Mounting plate, which is connected to the mounting frame through a mounting mechanism, and the mounting plate is driven by the mounting mechanism to approach or move away from the tightening position; The movable seat is slidably arranged on the mounting plate. Two sets of pulling mechanisms are arranged at the bottom of the movable seat. Each pulling mechanism includes two sets of tensioning components that slide relative to each other. The first driving mechanism is arranged on the movable seat and is connected to the two sets of tensioning components in each pulling mechanism to drive the two sets of tensioning components to slide in opposite directions, and the sliding direction is perpendicular to the sliding direction of the pulling mechanism; and The second driving mechanism is arranged on the movable seat and is connected to the two sets of pulling mechanisms to drive the two sets of pulling mechanisms to slide in opposite directions.

[0007] In a preferred embodiment, the mounting mechanism includes: The movable plate is slidably arranged on the mounting frame. A first connecting frame and a second connecting frame are hinged on the movable plate. The first connecting frame and the second connecting frame are respectively hinged to both ends of the mounting plate; and The telescopic rod is hinged at one end to the movable plate and at the other end to the first connecting frame or the second connecting frame.

[0008] In a preferred embodiment, the pulling mechanism includes: The slider is slidably arranged at the bottom of the movable seat; The mounting rod is slidably arranged on the slider; and There are two sets of mounting blocks. One set of mounting blocks is fixedly arranged on the mounting rod, and the other set of mounting blocks is slidably arranged at one end of the mounting rod along the sliding direction of the mounting rod. The tensioning components are arranged on the mounting blocks.

[0009] In a preferred embodiment, the tensioning component includes: The lifting rod is vertically slidably penetrated through the mounting block; and The suction cup is arranged at the bottom of the lifting rod, and a first elastic member is arranged between the suction cup and the mounting block.

[0010] In a preferred embodiment, the first driving mechanism includes: The mounting shaft is rotatably arranged on the slider along its axis, and a support frame is rotatably arranged on the mounting shaft; The first bidirectional lead screw is rotatably arranged on the support frame along its axis, and both ends of the first bidirectional lead screw are respectively screwed to the two sets of mounting blocks; There are two sets of straight gears, which are respectively fixedly arranged on the mounting shaft and the first bidirectional lead screw, and the two sets of straight gears are screwed together.

[0011] In a preferred embodiment, a rotatable first helical gear is provided on the movable seat, and the first helical gear is connected to the mounting shaft through a linkage assembly, so that the rotation of the first helical gear can be converted into driving the rotation of the two groups of mounting shafts simultaneously before and after the slider slides through the linkage assembly.

[0012] In a preferred embodiment, the linkage assembly includes: A driving shaft rotatably arranged on the movable seat along its axis, and the first helical gear is fixedly arranged on the driving shaft; Two driving cylinders are provided and are both slidably sleeved at both ends of the driving shaft; and A bevel gear pair connected to the driving cylinder and the mounting shaft.

[0013] In a preferred embodiment, the second driving mechanism includes: A second bidirectional lead screw rotatably arranged on the movable seat along its axis, and both ends thereof are respectively screwed to the two groups of sliders; A second helical gear arranged on the second bidirectional lead screw; and A driving rod slidably and rotatably arranged on the movable seat along its axis and connected to the first helical gear and the second helical gear through a switching driving mechanism, so that the rotation of the driving rod can be selectively converted into driving the rotation of the first helical gear or the second helical gear through the switching driving mechanism.

[0014] In a preferred embodiment, the switching driving mechanism includes: A third helical gear rotatably arranged on the movable seat, vertically meshed with the first helical gear, and a first tooth disc is arranged on one side thereof, and a second tooth disc meshed with the first tooth disc is fixedly arranged on the driving rod; A fourth helical gear rotatably arranged on the movable seat, vertically meshed with the second helical gear, and a third tooth disc is arranged on one side thereof, and a fourth tooth disc meshed with the third tooth disc is fixedly arranged on the driving rod. The second tooth disc and the fourth tooth disc are arranged at intervals, and the distance therebetween is smaller than the distance between the first tooth disc and the third tooth disc.

[0015] In a preferred embodiment, a retaining frame is provided on the movable seat, and a second elastic member is arranged between the retaining frame and the fourth tooth disc.

[0016] Compared with the prior art, the present invention has the following beneficial effects: When in use, the device fixes the mounting frame to the edge of the operating table. The mounting plate can be controlled by the mounting mechanism to approach the tension position on the patient's skin, and the four groups of tension components are brought into contact with the patient's skin. Then, the first driving mechanism can be used to drive the tension component seats in each traction mechanism to slide in opposite directions, so as to tension the skin in one direction. Then, the second driving mechanism is used to drive the two traction mechanisms to slide in opposite directions, so as to tension the skin in another direction through the tension components in pairs of two, thereby effectively avoiding the occurrence of wrinkles in the vertical direction after the skin is tensioned in a single direction, making the skin in a tight state in multiple directions, avoiding the influence of skin wrinkles on puncture, and improving the subsequent puncture effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present invention, the drawings required for use in the specific embodiments will be briefly introduced below. In all the drawings, the components or parts do not necessarily draw according to the actual ratio.

[0018] Figure 1 Schematic diagram of the three-dimensional structure of a skin tensioning device for thoracic puncture provided by the present invention; Figure 2 Schematic diagram of the structure of the sliding seat and the parts above it in a skin tensioning device for thoracic puncture of the present invention; Figure 3 For Figure 2 the structure diagram of the elevation axis side; Figure 4 Schematic diagram of the installation structure of the bottom parts of the sliding seat in a skin tensioning device for thoracic puncture of the present invention; Figure 5 Schematic diagram of the structure of the drive rod in a skin tensioning device for thoracic puncture of the present invention; Figure 6 Schematic diagram of the installation structure of the slider and the parts above it in a skin tensioning device for thoracic puncture of the present invention; Reference numerals: 1, mounting frame; 2, first connecting frame; 3, second connecting frame; 4, movable plate; 5, telescopic rod; 6, mounting plate; 7, movable seat; 8, slider; 9, mounting shaft; 10, spur gear; 11, mounting rod; 12, mounting block; 13, support frame; 14, first bidirectional lead screw; 15, lifting rod; 16, suction cup; 17, first elastic member; 18, drive cylinder; 19, bevel gear pair; 20, drive shaft; 21, first helical gear; 22, third helical gear; 23, first tooth disk; 24, second bidirectional lead screw; 25, second helical gear; 26, fourth helical gear; 27, third tooth disk; 28, retaining frame; 29, drive rod; 30, second tooth disk; 31, fourth tooth disk; 32, second elastic member. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific embodiments are only used to further illustrate the present invention and should not be construed as limiting the protection scope of the present invention. Those skilled in the art can make some non-essential improvements and adjustments to the present invention based on the above application content.

[0020] Embodiment: As Figure 1 、 2 shown, the present invention provides a skin tensioning device for thoracic puncture, which includes a mounting frame 1. A mounting plate 6 is arranged on the mounting frame 1 and is connected through a mounting mechanism. The mounting plate 6 is driven by the mounting mechanism to approach or move away from the tensioning position. The mounting mechanism includes a movable plate 4 slidably arranged on the mounting frame 1. A first connecting frame 2 and a second connecting frame 3 are hinged on the movable plate 4. The first connecting frame 2 and the second connecting frame 3 are respectively hinged to both ends of the mounting plate 6. An expansion link 5 is also included. One end of the expansion link 5 is hinged to the movable plate 4, and the other end is hinged to the first connecting frame 2 or the second connecting frame 3.

[0021] During use, the mounting frame 1 can be mounted on the operating table. The longitudinal adjustment of the tensioning position can be achieved by controlling the sliding of the movable plate 4 on the mounting frame 1. And the telescopic movement of the expansion link 5 can be controlled to drive the first connecting frame 2 and the second connecting frame 3 to rotate simultaneously along both ends of the mounting plate 6, so as to drive the mounting plate 6 to move above the tensioning position. In addition, it can be understood that in some preferred embodiments, the first connecting frame 2 and the second connecting frame 3 have the same length, and the mounting plate 6 and the movable plate 4 have the same length and are in a parallel state, so that the mounting plate 6 does not deflect during movement, improving the accuracy of subsequent punctures.

[0022] As Figure 2 、 3 、6 shown, in this embodiment, a movable seat 7 is slidably arranged on the mounting plate 6. Two groups of pulling mechanisms are arranged at the bottom of the movable seat 7. The pulling mechanism includes two groups of relatively sliding tensioning components. The pulling mechanism includes a slider 8 slidably arranged at the bottom of the movable seat 7. An installation rod 11 is slidably arranged on the slider 8. Two groups of installation blocks 12 are also included. One group of installation blocks 12 is fixedly arranged on the installation rod 11, and the other group of installation blocks 12 is slidably arranged at one end of the installation rod 11 along the sliding direction of the installation rod 11. The tensioning components are arranged on the installation blocks 12. The tensioning component includes a lifting rod 15 vertically slidably arranged on the installation block 12. A suction cup 16 is arranged at the bottom of the lifting rod 15. A first elastic member 17 is arranged between the suction cup 16 and the installation block 12.

[0023] After moving the mounting plate 6 above the patient's skin, the position of multiple groups of suction cups 16 can be finely adjusted by sliding the movable seat 7 on the mounting plate 6, so that multiple groups of suction cups 16 can move above the area to be tightened. Then, continue to control the mounting plate 6 to move downward so that multiple groups of suction cups 16 contact the patient's skin, and compress the first elastic member 17. Under the action of the first elastic member 17, a downward pressure is applied to the suction cups 16, thereby improving the stability of the suction cups 16 adsorbing the skin. The skin can be tightened in one direction by simultaneously controlling the two mounting blocks 12 in the two pulling mechanisms to slide in opposite directions, and the skin can be tightened in another direction by controlling the two pulling mechanisms to slide in opposite directions. The two tightening directions are perpendicular, so as to effectively avoid the situation that the skin still has wrinkles in the vertical direction when the skin is tightened in a single direction, improve the effect of skin tightening, and further improve the subsequent puncture effect.

[0024] As Figure 2 , 3 , as shown in FIG. 6, in this embodiment, a first driving mechanism connected to the two tightening components in each pulling mechanism is provided on the movable seat 7. By driving the first driving mechanism, the two tightening component seats slide in opposite directions, and the sliding direction is perpendicular to the sliding direction of the pulling mechanism. The first driving mechanism includes a mounting shaft 9 rotatably provided on the slider 8 along its axis. A support frame 13 is rotatably provided on the mounting shaft 9. A first bidirectional lead screw 14 is rotatably provided on the support frame 13 along its axis. The two ends of the first bidirectional lead screw 14 are respectively screwed to the two mounting blocks 12. It also includes two spur gears 10. The two spur gears 10 are respectively fixedly provided on the mounting shaft 9 and the first bidirectional lead screw 14, and the two spur gears 10 are screwed.

[0025] By driving the mounting shaft 9 to rotate, one of the spur gears 10 can be driven to rotate. Then, through the meshing of the two spur gears 10, the first bidirectional lead screw 14 is driven to rotate. The first bidirectional lead screw 14 drives the two mounting blocks 12 to slide in opposite directions through threads with opposite helix directions, so as to drive the four suction cups 16 to slide in opposite directions in pairs of two, and tighten the skin in a single direction.

[0026] As Figures 3 to 5 shown, in this embodiment, a rotatable first helical gear 21 is provided on the movable seat 7. The first helical gear 21 is connected to the mounting shaft 9 through a linkage component, and through the linkage component, the rotation of the first helical gear 21 can be converted into driving the two mounting shafts 9 to rotate both before and after the slider 8 slides. The linkage component includes a driving shaft 20 rotatably provided on the movable seat 7 along its axis. The first helical gear 21 is fixedly provided on the driving shaft 20. Driving cylinders 18 are slidably sleeved at both ends of the driving shaft 20. The driving cylinders 18 and the mounting shaft 9 are connected through bevel gear pairs 19.

[0027] During the rotation of the first helical gear 21, the drive shaft 20 can be driven to rotate. The two drive cylinders 18 are driven to rotate simultaneously through the drive shaft 20. During the sliding of the two sliders 8, the drive cylinder 18 slides on the drive shaft 20. Thus, when the slider 8 slides to any position, the rotation of the first helical gear 21 can drive the two tensioning components in each pulling mechanism to rotate in opposite directions.

[0028] As Figures 3 to 5 shown, in this embodiment, a second drive mechanism connected to the two pulling mechanisms is provided on the movable seat 7. The two pulling mechanisms are driven to slide in opposite directions through the second drive mechanism. The second drive mechanism includes a second bidirectional lead screw 24 rotatably provided on the movable seat 7. The two ends of the second bidirectional lead screw 24 are respectively screwed to the two sliders 8. A second helical gear 25 is provided on the second bidirectional lead screw 24. A driving rod 29 that can slide and rotate is provided on the movable seat 7. The driving rod 29 is connected to the first helical gear 21 and the second helical gear 25 through a switching drive mechanism. The rotation of the driving rod 29 can be selectively converted into the rotation of the first helical gear 21 or the second helical gear 25 through the switching drive mechanism. The switching drive mechanism includes a third helical gear 22 rotatably provided on the movable seat 7. The third helical gear 22 is vertically meshed with the first helical gear 21. A first toothed disc 23 is provided on one side of the third helical gear 22. A second toothed disc 30 that can be meshed with the first toothed disc 23 is fixedly provided on the driving rod 29. A fourth helical gear 26 is also rotatably provided on the movable seat 7. The fourth helical gear 26 is vertically meshed with the second helical gear 25. A third toothed disc 27 is provided on one side of it. A fourth toothed disc 31 that can be meshed with the third toothed disc 27 is fixedly provided on the driving rod 29. The second toothed disc 30 and the fourth toothed disc 31 are arranged at intervals, and the distance between them is smaller than the distance between the first toothed disc 23 and the third toothed disc 27.

[0029] By controlling the rotation of the second helical gear 25, the second bidirectional lead screw 24 can be driven to rotate. Then, the two sliders 8 are driven to slide in opposite directions through the threads with opposite helix directions at both ends of the second bidirectional lead screw 24, so as to drive the two pulling mechanisms to move in opposite directions. Cooperating with the first drive mechanism, the skin can be pulled in two perpendicular directions, effectively eliminating skin wrinkles.

[0030] In the initial state, the drive rod 29 is located at the highest position, so that the third gear disk 27 meshes with the fourth gear disk 31. By rotating the drive rod 29, the fourth helical gear 26 can be driven to rotate, and then the two sets of sliders 8 can slide in opposite directions. Then, by pressing down the drive rod 29, the second gear disk 30 can be meshed with the first gear disk 23. By rotating the drive rod 29, the third helical gear 22 can be driven to rotate, so that the two sets of mounting blocks 12 on each mounting shaft 9 move in opposite directions. By repeatedly adjusting the sliding directions of the four sets of mounting blocks 12, the skin can be quickly tightened in multiple directions. In addition, it can be understood that in some embodiments, the movable seat 7 is provided with a retaining frame 28, and a second elastic member 32 is arranged between the retaining frame 28 and the fourth gear disk 31. By arranging the second elastic member 32, when changing the height of the drive rod 29, only the drive rod 29 can be pressed downwards, so as to ensure that the multiple sets of suction cups 16 can stably contact the patient's skin, avoid the suction cups 16 detaching from the skin when adjusting the height of the drive rod 29, thereby further improving the tightening effect, and the overall tightening device will not block the skin, avoiding blocking the puncture tool and the vision of medical staff, and at the same time, there is no need for medical staff to hold the device by hand, so as to effectively improve the puncture efficiency.

[0031] Specific usage method and beneficial effects of the present invention: When the device is in use, the mounting frame 1 is fixed to the edge of the operating bed. The mounting plate 6 can be controlled by the mounting mechanism to approach the tightening position of the patient's skin, and the four sets of tightening components are brought into contact with the patient's skin. Then, each tightening component in each pulling mechanism can be driven by the first driving mechanism to slide in opposite directions to tighten the skin in one direction. Then, the two sets of pulling mechanisms are driven by the second driving mechanism to slide in opposite directions, so as to tighten the skin in another direction through the two-by-two tightening components, so as to tighten the skin horizontally and vertically, effectively avoiding the appearance of wrinkles in the vertical direction after the skin is tightened in a single direction, making the skin in a tight state in multiple directions, avoiding the influence of skin wrinkles on puncture, and improving the subsequent puncture effect.

[0032] The above shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments. Based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A skin tensioning device for thoracic puncture, characterized in that, Comprising: Mounting bracket (1); Mounting plate (6), connected to the mounting bracket (1) through a mounting mechanism, and the mounting plate (6) is driven to approach or move away from the tensioning position through the mounting mechanism; Movable seat (7), slidably arranged on the mounting plate (6), two sets of pulling mechanisms are arranged at the bottom of the movable seat (7), and each pulling mechanism includes two sets of tensioning components that slide relative to each other; First driving mechanism, arranged on the movable seat (7) and connected to two sets of tensioning components in each pulling mechanism to drive the two sets of tensioning components to slide in opposite directions, and the sliding direction is perpendicular to the sliding direction of the pulling mechanism; And Second driving mechanism, arranged on the movable seat (7) and connected to the two sets of pulling mechanisms to drive the two sets of pulling mechanisms to slide in opposite directions.

2. The thoracic puncture skin tensioning device according to claim 1, wherein The mounting mechanism includes: Movable plate (4), slidably arranged on the mounting bracket (1), a first connecting frame (2) and a second connecting frame (3) are hinged on the movable plate (4), and the first connecting frame (2) and the second connecting frame (3) are respectively hinged to both ends of the mounting plate (6); and Expansion rod (5), one end is hinged to the movable plate (4), and the other end is hinged to the first connecting frame (2) or the second connecting frame (3).

3. The thoracic cavity puncture skin tensioning device according to claim 1, characterized in that, The pulling mechanism includes: Slider (8), slidably arranged at the bottom of the movable seat (7); Mounting rod (11), slidably arranged on the slider (8); and Mounting blocks (12), two sets are provided, one set of the mounting blocks (12) is fixedly arranged on the mounting rod (11), and the other set of the mounting blocks (12) is slidably arranged at one end of the mounting rod (11) along the sliding direction of the mounting rod (11), and the tensioning components are arranged on the mounting blocks (12).

4. The thoracentesis skin tensioning device according to claim 3, wherein, The tensioning component includes: Lifting rod (15), vertically slidably passing through the mounting block (12); and Suction cup (16), arranged at the bottom of the lifting rod (15), and a first elastic member (17) is arranged between the suction cup (16) and the mounting block (12).

5. The thoracic puncture skin tightening device according to claim 3, characterized in that The first driving mechanism includes: Mounting shaft (9), rotatably arranged on the slider (8) along its axis, and a support frame (13) is rotatably arranged on the mounting shaft (9); First bidirectional lead screw (14), rotatably arranged on the support frame (13) along its axis, and its two ends are respectively screwed to the two sets of mounting blocks (12); Straight gears (10), two sets are provided, and are respectively fixedly arranged on the mounting shaft (9) and the first bidirectional lead screw (14), and the two sets of straight gears (10) are screwed together.

6. The chest puncture skin tensioning device according to claim 5, characterized in that, A rotatable first helical gear (21) is arranged on the movable seat (7), and the first helical gear (21) is connected to the mounting shaft (9) through a linkage assembly, and through the linkage assembly, the rotation of the first helical gear (21) can be converted into driving the rotation of the two sets of mounting shafts (9) both before and after the slider (8) slides.

7. The thoracic puncture skin tightening device according to claim 6, characterized in that, The linkage assembly includes: The drive shaft (20) is rotatably arranged on the movable seat (7) along its axis, and the first helical gear (21) is fixedly arranged on the drive shaft (20); There are two sets of drive cylinders (18), and both are slidably sleeved at both ends of the drive shaft (20); and A bevel gear pair (19) is connected to the drive cylinder (18) and the mounting shaft (9).

8. The thoracic puncture skin tensioning device according to claim 6, wherein The second drive mechanism includes: A second bidirectional lead screw (24) is rotatably arranged on the movable seat (7) along its axis, and its two ends are respectively screwed to the two sets of sliders (8); A second helical gear (25) is arranged on the second bidirectional lead screw (24); and A drive rod (29) is slidably and rotatably arranged on the movable seat (7) along its axis, and is connected to the first helical gear (21) and the second helical gear (25) through a switching drive mechanism, and the rotation of the drive rod (29) can be selectively converted into driving the first helical gear (21) or the second helical gear (25) to rotate through the switching drive mechanism.

9. The thoracic puncture skin tensioning device according to claim 8, wherein, The switching drive mechanism includes: A third helical gear (22) is rotatably arranged on the movable seat (7), is vertically meshed with the first helical gear (21), and a first tooth disc (23) is arranged on one side thereof, and a second tooth disc (30) that can be meshed with the first tooth disc (23) is fixedly arranged on the drive rod (29); A fourth helical gear (26) is rotatably arranged on the movable seat (7), is vertically meshed with the second helical gear (25), and a third tooth disc (27) is arranged on one side thereof, and a fourth tooth disc (31) that can be meshed with the third tooth disc (27) is fixedly arranged on the drive rod (29), the second tooth disc (30) and the fourth tooth disc (31) are arranged at intervals, and the distance therebetween is less than the distance between the first tooth disc (23) and the third tooth disc (27).

10. The thoracic puncture skin tensioning device according to claim 9, characterized in that: The movable seat (7) is provided with a stop frame (28), and a second elastic member (32) is arranged between the stop frame (28) and the fourth tooth disc (31).

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