Intensive unit extracorporeal circulator for hemodialysis

Abstract

The invention discloses an intensive care unit extracorporeal circulator for hemodialysis, and belongs to the field of medical equipment. Comprising an instrument body, a heat preservation cylinder is fixedly connected to the right side of the instrument body, two collecting discs are arranged in the heat preservation cylinder, and the left side of the collecting disc located on the left side in the heat preservation cylinder is rotationally connected with the output end of the instrument body through a rotating shaft; an output pipe is fixedly communicated with the right side of the collecting disc located on the right side in the heat preservation cylinder; during backflow, a motor is started, a first gear and a second gear are meshed to drive a collecting disc to rotate, then a plurality of branch pipes are driven to rotate along the outer side of a heating rod, meanwhile, a third gear and a gear ring are meshed to enable the branch pipes to rotate, and therefore when blood passes through the instrument body for dialysis backflow, the dialyzed blood can be heated and subjected to temperature control; the problem that blood flowing back to the outside of the patient is inconsistent with the body temperature of the patient is avoided.

Description

Technical Field

[0001] The invention relates to the field of medical equipment, and in particular to an extracorporeal circulator in a intensive care unit for hemodialysis. Background Art

[0002] Hemodialysis is a process of draining blood from the body to the outside of the body through a dialyzer composed of countless hollow fibers. The blood and the electrolyte solution (dialysate) containing electrolytes at similar concentrations to the body are exchanged through diffusion and convection inside and outside the hollow fibers to remove metabolic wastes, maintain electrolyte and acid-base balance, and remove excess water from the body. The entire process of returning the purified blood is called hemodialysis.

[0003] Patent Publication No. (CN108187162A) discloses a hemodialysis machine, including an instrument body, a base is fixedly connected to the lower end of the side of the instrument body, both sides of the upper surface of the base are fixedly connected to limit rods, the upper end of the base is fixedly connected to a first spring, the first spring is movably sleeved on the surface of the limit rod, the upper end of the limit rod is fixedly connected to a buffer sheet, the inner side of the buffer sheet is slidably sleeved on the surface of the limit rod, the surface of the limit rod is sleeved on the limit sleeve, the outer side of the limit sleeve is fixedly connected to a support block, the upper end of the support block is fixedly connected to a threaded rod, the upper end of the limit rod is fixedly connected to a support table, and one side of the support table is fixedly connected to the surface of the instrument body. The hemodialysis machine can effectively drag and drop the patient's hands when treating the disease, can adjust the height of the positioning plate according to the patient's hand height and sitting posture, and can fix the patient's hands when doing dialysis;

[0004] When the hemodialysis machine in the above technology is in use, the blood flowing back to the patient's body is inconsistent with the patient's body temperature, causing the patient to feel uncomfortable, and the device cannot be automatically cleaned. In addition, the above technology is complicated to operate when fixing the hands and adjusting the fixing height, and needs to be improved. Summary of the invention

[0005] Purpose of the invention: The purpose of the present invention is to provide a device that can control the blood temperature during dialysis and automatically clean it; another purpose of the present invention is to provide a device that is simple to fix the hand and can adjust the fixing height.

[0006] Technical solution: An extracorporeal circulator for hemodialysis in a intensive care unit, comprising an instrument body, a heat preservation cylinder fixedly connected to the right side of the instrument body, two collecting plates arranged inside the heat preservation cylinder, the left side of the collecting plate located on the left side of the heat preservation cylinder being rotatably connected to the output end of the instrument body via a rotating shaft, the right side of the collecting plate located on the right side of the heat preservation cylinder being fixedly connected to an output pipe, the right end of the output pipe passing through the right side of the heat preservation cylinder and being fixedly connected to an adjusting chamber 1, the right side of the adjusting chamber 1 being fixedly connected to a docking joint 1, a plurality of branch pipes being rotatably connected between the two collecting plates via a rotating shaft, and a heating rod being fixedly connected to opposite sides of the two collecting plates;

[0007] A water tank is fixed on the right side of the instrument body, located below the insulation cylinder; a dialysis pump is fixedly connected to the lower surface of the water tank; the output end of the dialysis pump is fixedly connected to the input end of the instrument body; the input end of the dialysis pump is fixedly connected to an input pipe; an outer wall of the input pipe is slidably connected to an adjusting chamber 2; a docking joint 2 is slidably connected to the inside of the adjusting chamber 2, located to the right of the input pipe; the right end of the docking joint 2 extends to the right side of the water tank.

[0008] Furthermore, a motor is fixedly connected to the right side of the insulation tube, the left end of the output shaft of the motor is located inside the insulation tube and is fixedly connected to gear one, the outer wall of the output pipe is fixedly connected to gear two, and gear two is meshingly connected to gear one.

[0009] Furthermore, a gear ring is fixedly connected to the interior of the heat preservation tube, and outer side walls of the plurality of branch pipes are fixedly connected to gear three, and the gear ring is meshingly connected to the gear three.

[0010] Furthermore, the interior of the regulating chamber 1 is slidably connected to a steering chamber, the top and bottom of the steering chamber are fixedly connected to a sealing plate 1, a through-type docking port is opened on the left side of the steering chamber, the bottom of the steering chamber is fixedly connected to a return pipe, the bottom end of the return pipe penetrates into the interior of the water tank, and a rotating connection piece 1 is fixedly connected to the outer wall, the left side of the rotating connection piece 1 is rotatably connected to a connecting rod via a rotating shaft, the bottom end of the connecting rod is rotatably connected to a rotating connection piece 2 via a rotating shaft, the bottom of the rotating connection piece 2 is fixedly connected to the upper surface of the regulating chamber 2, the upper surface of the water tank is located on the right side of the return pipe and is fixedly connected to an electric push rod, and a connector is fixedly connected between the top end of the output end of the electric push rod and the return pipe.

[0011] Furthermore, the outer wall of the input pipe is located inside the regulating chamber 2 and is fixedly connected to a sealing plate 2, and the outer wall of the docking joint 2 is located inside the regulating chamber 2 and is slidably connected to a sealing plate 3.

[0012] Furthermore, a water inlet is provided on the lower surface of the regulating chamber 2, and a sealing plate 4 is fixedly connected to the inner lower surface of the regulating chamber 2 on the right side of the water inlet. A sealing plate 5 is integrally formed on the left side of the sealing plate 3, and the sealing plate 4 is in contact with the opposite side of the sealing plate 5.

[0013] Furthermore, the front surface of the instrument body is fixedly connected to a lifting box, the interior of the lifting box is slidably connected to a piston plate, a spring is fixedly connected between the piston plate and the lifting box, the interior of the piston plate is fixedly connected to a lifting plate, the top of the lifting plate is located above the lifting box and is fixedly connected to two lower placement seats, the front of the upper surface of the lower placement seat is rotatably connected to a screw via a rotating shaft, the outer side wall of the screw is threadedly connected to an upper placement seat, the rear surface of the upper placement seat is in contact with the front surface of the instrument body, and the top of the screw is fixedly connected to a knob.

[0014] Furthermore, ventilation holes are provided at the rear of the upper surfaces of the two lower placement seats, and ventilation hoses are fixedly connected between the two ventilation holes and the lifting box.

[0015] Furthermore, a plurality of supporting legs are fixedly connected to the lower surface of the instrument body, a buffer plate is fixedly connected to the bottom end of the supporting legs, a supporting tube is slidably connected to the outer wall of the buffer plate, and a spring 2 is fixedly connected between the supporting tube and the buffer plate.

[0016] Beneficial effects:

[0017] When the blood is refluxed, the motor is started, and the meshing of gear 1 and gear 2 drives the collecting plate to rotate, and then drives the multiple branch pipes to rotate along the outside of the heating rod. At the same time, the meshing of gear 3 and the gear ring allows the branch pipes to rotate by themselves, so that when the blood is dialyzed and refluxed through the instrument body, the dialyzed blood can be heated and temperature controlled, avoiding the problem of the blood flowing back to the patient's body being inconsistent with the patient's body temperature;

[0018] When the electric push rod is in the extended state, the steering cavity will be blocked inside the regulating cavity 1. At this time, the liquid discharged through the regulating cavity 1 will flow into the water tank through the docking port and the reflux pipe. At this time, the sealing plate 4 and the sealing plate 5 are attached together, and the docking port 2 is blocked and sealed. At this time, the dialysis pump can be started to draw the water for cleaning stored in the water tank in advance through the water inlet and enter the instrument body for cleaning. This method can achieve the effect of circulating flushing and ensure the cleaning of the device after dialysis.

[0019] By controlling the electric push rod to retract, the steering chamber and the reflux pipe are lowered together. At this time, the blood flowing into the regulating chamber 1 will be discharged through the docking joint 1. At the same time, under the push of the connecting rod, the regulating chamber 2 will be driven to move, so that the sealing plate 4 and the sealing plate 5 are separated. At the same time, the water inlet is blocked by the sealing plate 2. At this time, blood will be drawn through the docking joint 2 and enter the instrument body through the input tube, thereby achieving the effect of hemodialysis;

[0020] During dialysis, the arm can be placed above the lower placement seat, and then the lifting plate can be pressed down to make the piston plate descend along the inside of the lifting box to control the placement height. Then the handheld knob can be used to drive the screw to rotate, controlling the two upper placement seats to descend and engage the arm. At the same time, the upper placement seat will cover the vent to prevent the lifting box from venting through the ventilation hose, thereby ensuring that after the height adjustment engages the arm, the piston plate will not slide along the inside of the lifting box, ensuring that the arm is stably placed at an appropriate height. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the internal structure of the heat preservation cylinder of the present invention;

[0023] Figure 3 It is a schematic diagram of the internal structure of the water tank of the present invention;

[0024] Figure 4 It is a schematic diagram of the cross-sectional connection structure of the adjustment chamber 1 and the steering chamber of the present invention;

[0025] Figure 5 It is a schematic diagram of the cross-sectional connection structure of the regulating chamber 2, the input pipe and the docking joint 2 of the present invention;

[0026] Figure 6 It is a partial cross-sectional schematic diagram of the connection structure of the lifting chamber, the lifting plate and the lower placement seat of the present invention;

[0027] Figure 7 It is a schematic diagram of the cross-sectional connection structure of the support leg and the support tube of the present invention.

[0028] In the figure: 1. Instrument body; 2. Insulation tube; 3. Collecting plate; 4. Output pipe; 5. Adjustment chamber 1; 6. Butt joint 1; 7. Branch pipe; 8. Heating rod; 9. Water tank; 10. Dialysis pump; 11. Input pipe; 12. Adjustment chamber 2; 13. Butt joint 2; 14. Motor; 15. Gear 1; 16. Gear 2; 17. Gear ring; 18. Gear 3; 19. Steering chamber; 20. Sealing plate 1; 21. Butt joint; 22. Rotating connector 1; 23. Connecting rod; 24. Rotating Connector 2; 25. Sealing plate 2; 26. Sealing plate 3; 27. Water inlet; 28. Sealing plate 4; 29. ​​Sealing plate 5; 30. Lifting box; 31. Piston plate; 32. Spring 1; 33. Lifting plate; 34. Lower seat; 35. Screw; 36. Upper seat; 37. Knob; 38. Vent hole; 39. Vent hose; 40. Support leg; 41. Buffer plate; 42. Support tube; 43. Spring 2; 44. Electric push rod; 45. Connector; 46. Return pipe. DETAILED DESCRIPTION

[0029] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Example 1

[0031] like Figure 1 and Figure 2 As shown, an extracorporeal circulation device for a ward for hemodialysis is provided, comprising an instrument body 1, a heat preservation tube 2 is fixedly connected to the right side of the instrument body 1, two collecting trays 3 are arranged inside the heat preservation tube 2, the left side of the collecting tray 3 located on the left side of the heat preservation tube 2 is rotatably connected to the output end of the instrument body 1 through a rotating shaft, the right side of the collecting tray 3 located on the right side of the heat preservation tube 2 is fixedly connected to an output tube 4, the right end of the output tube 4 passes through the right side of the heat preservation tube 2, and is fixedly connected to an adjusting chamber 5, and the right side of the adjusting chamber 5 is fixedly connected to a docking joint 6 , a plurality of branch pipes 7 are connected to the two collecting plates 3 by rotating through a rotating shaft, a heating rod 8 is fixedly connected to the opposite sides of the two collecting plates 3, a motor 14 is fixedly connected to the right side of the heat preservation tube 2, the left end of the output shaft of the motor 14 is located inside the heat preservation tube 2 and is fixedly connected to a gear 15, a gear 2 16 is fixedly connected to the outer wall of the output tube 4, the gear 2 16 is meshed with the gear 1 15, a gear ring 17 is fixedly connected to the inside of the heat preservation tube 2, and a plurality of branch pipes 7 are fixedly connected to the outer walls of the plurality of branch pipes 7, and the gear 3 18 is meshed with the gear ring 17;

[0032] When the device is in use, the connector 1 6 is connected to the needle tube for external reflux. When reflux occurs, the motor 14 is started, and the collection plate 3 is driven to rotate through the meshing of the gear 1 15 and the gear 2 16, and then the multiple branch tubes 7 are driven to rotate along the outside of the heating rod 8. At the same time, the branch tubes 7 can rotate by themselves through the meshing of the gear 3 18 and the gear ring 17, so that when the blood refluxes through the instrument body 1, the dialyzed blood can be heated and the temperature can be controlled, so as to avoid the problem that the blood flowing back to the patient's body is inconsistent with the patient's body temperature;

[0033] like Figure 3 As shown, a water tank 9 is fixed to the right side of the instrument body 1 below the heat preservation cylinder 2, a dialysis pump 10 is fixedly connected to the lower surface of the inner part of the water tank 9, the output end of the dialysis pump 10 is fixedly connected to the input end of the instrument body 1, the input end of the dialysis pump 10 is fixedly connected to an input pipe 11, an outer side wall of the input pipe 11 is slidably connected to an adjusting chamber 2 12, the inside of the adjusting chamber 2 12 is located on the right side of the input pipe 11 and is slidably connected to a docking joint 2 13, the right end of the docking joint 2 13 penetrates to the right side of the water tank 9;

[0034] The water tank 9 is used to store clean water, and the second docking joint 13 is used to dock and communicate with a needle tube used to draw blood for dialysis.

[0035] like Figure 4 and Figure 5 As shown, the interior of the regulating chamber 15 is slidably connected with the steering chamber 19, the top and bottom of the steering chamber 19 are fixedly connected with the sealing plate 10, the left side of the steering chamber 19 is provided with a through-type docking port 21, the bottom of the steering chamber 19 is fixedly connected with a return pipe 46, the bottom end of the return pipe 46 penetrates into the interior of the water tank 9, and the outer wall is fixedly connected with a rotating connector 22, the left side of the rotating connector 22 is rotatably connected with a connecting rod 23 through a rotating shaft, the bottom end of the connecting rod 23 is rotatably connected with a rotating connector 24 through a rotating shaft, the bottom of the rotating connector 24 is fixedly connected to the upper surface of the regulating chamber 12, and the upper surface of the water tank 9 is located at the return pipe 46. An electric push rod 44 is fixedly connected to the right side of the flow tube 46, a connector 45 is fixedly connected between the top of the output end of the electric push rod 44 and the return tube 46, the outer wall of the input tube 11 is located inside the regulating chamber 12 and is fixedly connected to the sealing plate 25, the outer wall of the joint 13 is located inside the regulating chamber 12 and is slidably connected to the sealing plate 3 26, the lower surface of the regulating chamber 12 is provided with a water inlet 27, the inner lower surface of the regulating chamber 12 is located on the right side of the water inlet 27 and is fixedly connected to the sealing plate 4 28, the left side of the sealing plate 3 26 is integrally formed with a sealing plate 5 29, and the sealing plate 4 28 is in contact with the opposite side of the sealing plate 5 29;

[0036] When the electric push rod 44 is in the extended state, the steering cavity 19 will block the inside of the regulating cavity 15. At this time, the liquid discharged through the regulating cavity 15 will flow into the water tank 9 through the docking port 21 and the reflux pipe 46. At this time, the sealing plate 4 28 and the sealing plate 5 29 are attached together, and the docking port 2 13 is blocked and sealed. At this time, the dialysis pump 10 can be started, and the water for cleaning stored in the water tank 9 in advance can be drawn through the water inlet 27 to enter the inside of the instrument body 1 for cleaning. This method can achieve the effect of circulating flushing and ensure that the device It is placed for cleaning after dialysis; by controlling the electric push rod 44 to contract, the steering chamber 19 and the reflux pipe 46 are lowered together. At this time, the blood flowing into the regulating chamber 15 will be discharged through the docking joint 16. At the same time, under the push of the connecting rod 23, the regulating chamber 2 12 will be driven to move, so that the sealing plate 4 28 is separated from the sealing plate 5 29. At the same time, the water inlet 27 is blocked by the sealing plate 25. At this time, blood will be drawn through the docking joint 13 and enter the instrument body 1 through the input tube 11, thereby achieving the effect of hemodialysis.

[0037] like Figure 6 As shown, a lifting box 30 is fixedly connected to the front surface of the instrument body 1, a piston plate 31 is slidably connected to the inside of the lifting box 30, a spring 32 is fixedly connected between the piston plate 31 and the lifting box 30, a lifting plate 33 is fixedly connected to the inside of the piston plate 31, the top of the lifting plate 33 is located above the lifting box 30 and is fixedly connected to two lower placement seats 34, a screw 35 is rotatably connected to the front of the upper surface of the lower placement seat 34 through a rotating shaft, an upper placement seat 36 is threadedly connected to the outer wall of the screw 35, the rear surface of the upper placement seat 36 is in contact with the front surface of the instrument body 1, a knob 37 is fixedly connected to the top of the screw 35, ventilation holes 38 are opened at the rear of the upper surfaces of the two lower placement seats 34, and ventilation hoses 39 are fixedly connected between the two ventilation holes 38 and the lifting box 30;

[0038] During dialysis, the arm can be placed above the lower placement seat 34, and then the lifting plate 33 is pressed down to make the piston plate 31 descend along the inside of the lifting box 30 to control the placement height. Then the hand-held knob 37 drives the screw 35 to rotate, and controls the two upper placement seats 36 to descend and engage the arm. At the same time, the upper placement seat 36 will block the vent 38 to prevent the lifting box 30 from venting through the ventilation hose 39, thereby ensuring that after the height is adjusted to engage the arm, the piston plate 31 will not slide along the inside of the lifting box 30, ensuring that the arm is stably placed at a suitable height.

[0039] like Figure 7 As shown, a plurality of support legs 40 are fixedly connected to the lower surface of the instrument body 1, a buffer plate 41 is fixedly connected to the bottom end of the support leg 40, a support tube 42 is slidably connected to the outer wall of the buffer plate 41, and a spring 43 is fixedly connected between the support tube 42 and the buffer plate 41;

[0040] It has the effect of buffering support.

[0041] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An extracorporeal circulation device for hemodialysis in a intensive care unit, comprising an instrument body (1), characterized in that: The right side of the instrument body (1) is fixedly connected with a heat preservation tube (2), and two collecting plates (3) are arranged inside the heat preservation tube (2). The left side of the collecting plate (3) located on the left side of the heat preservation tube (2) is rotatably connected to the output end of the instrument body (1) via a rotating shaft, and the right side of the collecting plate (3) located on the right side of the heat preservation tube (2) is fixedly connected with an output pipe (4). The right end of the output pipe (4) passes through the right side of the heat preservation tube (2) and is fixedly connected with an adjusting chamber (5). The right side of the adjusting chamber (5) is fixedly connected with a docking joint (6). A plurality of branch pipes (7) are rotatably connected between the two collecting plates (3) via a rotating shaft, and a heating rod (8) is fixedly connected to the opposite sides of the two collecting plates (3); A water tank (9) is fixedly provided on the right side of the instrument body (1) below the heat preservation cylinder (2); a dialysis pump (10) is fixedly connected to the lower surface of the water tank (9); the output end of the dialysis pump (10) is fixedly connected to the input end of the instrument body (1); the input end of the dialysis pump (10) is fixedly connected to an input pipe (11); an outer wall of the input pipe (11) is slidably connected to an adjusting chamber 2 (12); the interior of the adjusting chamber 2 (12) is located on the right side of the input pipe (11) and is slidably connected to a docking joint 2 (13); the right end of the docking joint 2 (13) extends to the right side of the water tank (9).

2. The extracorporeal circulation device for hemodialysis in a intensive care unit according to claim 1, characterized in that: The right side of the heat-insulating cylinder (2) is fixedly connected to a motor (14); the left end of the output shaft of the motor (14) is located inside the heat-insulating cylinder (2) and is fixedly connected to a gear one (15); the outer wall of the output pipe (4) is fixedly connected to a gear two (16); the gear two (16) is meshingly connected to the gear one (15).

3. The extracorporeal circulation device for hemodialysis in a intensive care unit according to claim 1, characterized in that: A gear ring (17) is fixedly connected inside the heat-insulating cylinder (2), and outer side walls of the plurality of branch pipes (7) are fixedly connected with gear three (18), and the gear ring (17) is meshingly connected with the gear three (18).

4. The extracorporeal circulation device for hemodialysis in a intensive care unit according to claim 1, characterized in that: The interior of the regulating chamber (5) is slidably connected to a steering chamber (19), the top and bottom of the steering chamber (19) are fixedly connected to a sealing plate (20), a through-type docking port (21) is provided on the left side of the steering chamber (19), the bottom of the steering chamber (19) is fixedly connected to a return pipe (46), the bottom end of the return pipe (46) passes through the interior of the water tank (9), and the outer wall is fixedly connected to a rotating connection piece (22), the rotating connection piece (22) The left side of the water tank (9) is rotatably connected to a connecting rod (23) via a rotating shaft, the bottom end of the connecting rod (23) is rotatably connected to a rotating connecting member 2 (24) via a rotating shaft, the bottom of the rotating connecting member 2 (24) is fixedly connected to the upper surface of the regulating chamber 2 (12), the upper surface of the water tank (9) is located on the right side of the return pipe (46) and is fixedly connected to an electric push rod (44), and a connector (45) is fixedly connected between the top end of the output end of the electric push rod (44) and the return pipe (46).

5. The extracorporeal circulation device for hemodialysis in a intensive care unit according to claim 1, characterized in that: The outer wall of the input pipe (11) is located inside the second regulating chamber (12) and is fixedly connected to a second sealing plate (25), and the outer wall of the second docking joint (13) is located inside the second regulating chamber (12) and is slidably connected to a third sealing plate (26).

6. The extracorporeal circulation device for hemodialysis in a intensive care unit according to claim 5, characterized in that: A water inlet (27) is provided on the lower surface of the regulating chamber 2 (12); a sealing plate 4 (28) is fixedly connected to the inner lower surface of the regulating chamber 2 (12) on the right side of the water inlet (27); a sealing plate 5 (29) is integrally formed on the left side of the sealing plate 3 (26); and the sealing plate 4 (28) is in contact with the opposite side of the sealing plate 5 (29).

7. The extracorporeal circulation device for hemodialysis in a intensive care unit according to claim 1, characterized in that: The front surface of the instrument body (1) is fixedly connected to a lifting box (30), the interior of the lifting box (30) is slidably connected to a piston plate (31), a spring (32) is fixedly connected between the piston plate (31) and the lifting box (30), the interior of the piston plate (31) is fixedly connected to a lifting plate (33), the top of the lifting plate (33) is located above the lifting box (30) and is fixedly connected to two lower placement seats (34), the front of the upper surface of the lower placement seat (34) is rotatably connected to a screw rod (35) through a rotating shaft, the outer wall of the screw rod (35) is threadedly connected to an upper placement seat (36), the rear surface of the upper placement seat (36) is in contact with the front surface of the instrument body (1), and the top of the screw rod (35) is fixedly connected to a knob (37).

8. The extracorporeal circulation device for hemodialysis in a intensive care unit according to claim 7, characterized in that: A ventilation hole (38) is provided at the rear of the upper surface of the two lower placement seats (34), and a ventilation hose (39) is fixedly connected between the two ventilation holes (38) and the lifting box (30).

9. The extracorporeal circulation device for hemodialysis in a intensive care unit according to claim 8, characterized in that: A plurality of support legs (40) are fixedly connected to the lower surface of the instrument body (1); a buffer plate (41) is fixedly connected to the bottom end of the support leg (40); a support tube (42) is slidably connected to the outer wall of the buffer plate (41); and a second spring (43) is fixedly connected between the support tube (42) and the buffer plate (41).

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