Endoscope supporting structure testing equipment

Abstract

The invention relates to the field of medical instrument testing equipment, in particular to endoscope supporting structure testing equipment which comprises an inlet pipe, a middle pipe, an outlet pipe and the like. According to the endoscope supporting structure testing equipment, the inlet pipe, the outlet pipe and the contraction pipe in the outlet pipe are all made of curve elastic materials with contraction performance, the environment that the supporting sleeve is extruded by different angles from all directions of the intestines and the stomach when an endoscope moves in the zigzag intestines and the stomach can be simulated, and the endoscope supporting structure testing equipment can be used for testing the endoscope supporting structure. Meanwhile, a push plate in the middle pipe is matched to directionally stretch the supporting sleeve, the anti-stretching test work is carried out on the endoscope in a complex environment, and a clamping plate and a wedge-shaped extrusion mechanism are further arranged to synchronously carry out anti-torsion test work on the endoscope; the technical problem that the effectiveness of the test result of the supporting sleeve is affected due to the fact that an existing endoscope test device cannot simulate the test environment that the human intestines and stomach conduct twisting and squeezing on the endoscope at different angles in all directions is solved.

Description

Technical Field

[0001] The invention relates to the field of medical device testing equipment, and in particular to an endoscope support structure testing equipment. Background Art

[0002] An endoscope is composed of a lens module, a support sleeve connected to the lens module, and an inner sheath wrapped in the support sleeve. As a medical detection instrument that can be inserted into the human esophagus and enter the stomach and intestines for detection, the endoscope needs to have sufficient structural support strength while twisting and moving along the stomach and intestines, providing sufficient support and protection for the lens module and the inner sheath. In the structural strength test of the endoscope, only a tensile testing machine can be used to perform a tensile strength test on the support sleeve of the endoscope, which cannot simulate the working state of the support sleeve in the complex environment of the human stomach and intestines. In particular, when the endoscope enters the human stomach and intestines, the human body twists due to discomfort, which will cause the stomach and intestines to contract and twist, thereby twisting and squeezing the endoscope in various directions and angles. The twisting and squeezing will cause a large non-directional squeezing force on the support sleeve of the endoscope. Therefore, the existing endoscope testing equipment has a relatively single performance test method for the support sleeve, which affects the validity of the test results of the support sleeve. Summary of the invention

[0003] In order to overcome the shortcomings of existing endoscope testing equipment that cannot simulate the test environment in which the human stomach and intestines twist and squeeze the endoscope in various directions and at different angles, thus affecting the validity of the test results of the support sleeve, the present invention provides an endoscope support structure testing equipment.

[0004] The technical solution is: an endoscope support structure testing device, including a mounting frame, an inlet tube, a middle tube, an exhaust tube, an outlet tube, a terminal tube, a push plate, a connecting frame, an electric push rod, a pressure sensor and a fixing plug; the inlet tube, the middle tube and the outlet tube are fixedly connected to the mounting frame in sequence; the inlet tube and the outlet tube are both set to simulate the curved pipeline cavity structure of the human intestine; the middle tube is set to simulate the crescent-shaped cavity structure of the human stomach; the two ends of the middle tube are respectively connected to the inlet tube and the outlet tube; the middle tube is connected to the exhaust tube; the inlet tube and the outlet tube are both made of elastic rubber material; the middle tube is slidably connected to the connecting frame, and a sealing ring is provided at the connection position between the middle tube and the connecting frame; a push plate is fixedly connected to the connecting frame, and the push plate is located inside the middle tube; an electric push rod is installed on the middle tube; the telescopic end of the electric push rod is fixedly connected to the connecting frame; at least one pressure sensor is installed on the push plate; the outlet tube is connected to the terminal tube; and a fixing plug is provided on the terminal tube.

[0005] As a further preferred solution, the middle pipe is assembled by splicing two front and rear half shells.

[0006] As a further preferred solution, both the middle pipe and the terminal pipe are made of transparent pipe material.

[0007] As a further preferred solution, a layer of shrinkable tube is fixedly connected inside the outlet tube, and the shrinkable tube is made of elastic silicone material.

[0008] As a further preferred solution, the inner wall of the shrink tube is provided with a plurality of extrusion block structures.

[0009] As a further preferred embodiment, the fixed plug is rotatably connected to the end tube; no less than two clamps are slidably connected to the fixed plug; a tension spring is fixedly connected between the clamp and the fixed plug; the lower end of the clamp is configured as a wedge-shaped structure; a fixed frame is fixedly connected to the mounting frame; a wedge-shaped extrusion mechanism for extruding the clamp is connected to the fixed frame; and the wedge-shaped extrusion mechanism connects the two clamps.

[0010] As a further preferred solution, a rubber sheet is fixed to the clamping plate.

[0011] As a further preferred embodiment, the wedge-shaped extrusion mechanism includes a lifting rotary block, a wedge-shaped ring, a first spur gear, a driving motor and a second spur gear; a screw thread structure is provided on the fixing plug; the lifting rotary block is screwed on the screw thread structure of the fixing plug; a wedge-shaped ring is fixed on the lifting rotary block; the wedge-shaped ring is tightly attached to the two clamping plates; the first spur gear is fixed on the fixing plug; a driving motor is installed on the fixing frame; the output shaft of the driving motor is fixedly connected to the second spur gear; the second spur gear is meshed with the first spur gear.

[0012] As a further preferred scheme, a circulating infusion mechanism for circulating hydrochloric acid is installed between the mounting frame and the fixed frame; an inlet pipe is fixedly connected to the outlet pipe; the inlet pipe is connected to the contraction tube; a drainage channel structure is opened on the fixed plug; the inlet pipe and the drainage channel structure are jointly connected to the circulating infusion mechanism.

[0013] As a further preferred embodiment, the circulating infusion mechanism includes an infusion pump, an infusion tube and a reflux tube; the infusion pump is installed on the mounting frame; the infusion tube is connected between the liquid outlet end of the infusion pump and the liquid inlet tube; the reflux tube is fixedly connected to the fixed frame; the reflux tube is rotatably connected to the fixed plug, and the reflux tube is connected to the discharge channel structure of the fixed plug; the reflux tube is connected to the liquid inlet end of the infusion pump; the transparent pipe material used for the terminal tube is transparent pipe material.

[0014] The present invention has the following advantages: the endoscope support structure testing device described in the present invention is mainly composed of an inlet tube, a middle tube, an outlet tube and a terminal tube. The inlet tube, the outlet tube and the shrink tube in the outlet tube are all made of curved elastic materials with shrinkage performance, which can simulate the environment in which the support sleeve is squeezed from different angles in all directions of the stomach and intestines when the endoscope moves in the tortuous stomach and intestines. At the same time, the push plate in the middle tube cooperates with the directional stretching of the support sleeve to perform tensile test on the endoscope in a complex environment. A splint and a wedge-shaped squeezing mechanism are also provided to synchronously perform anti-torsion test on the endoscope. In addition, by continuously delivering hydrochloric acid into the shrink tube, the gastric acid in the stomach and intestines can be simulated to perform corrosion resistance test on the endoscope, so that multiple tests can be completed synchronously on the endoscope under simple operation.

[0015] The invention overcomes the technical problem that the existing endoscope testing equipment cannot simulate the test environment in which the human stomach and intestines twist and squeeze the endoscope in various directions and at different angles, thus affecting the validity of the test results of the support sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A structural diagram for describing the present invention;

[0017] Figure 2 A structural diagram for describing the inlet pipe, the middle pipe, the outlet pipe and the terminal pipe of the present invention;

[0018] Figure 3 A cross-sectional view for describing the intermediate pipe and the outlet pipe of the present invention;

[0019] Figure 4 An exploded view of the mid-route pipe splicing assembly structure of the present invention is provided;

[0020] Figure 5 A cross-sectional view for describing the shrink tube of the present invention;

[0021] Figure 6 A structural diagram for describing the fixed plug and the return pipe of the present invention;

[0022] Figure 7 A cross-sectional view for describing the terminal tube of the present invention;

[0023] Figure 8 A cross-sectional view is provided to describe the fixing plug of the present invention.

[0024] Figure markings: 1-mounting frame, 21-inlet pipe, 22-middle pipe, 221-exhaust pipe, 23-outlet pipe, 231-liquid inlet pipe, 24-terminal pipe, 25-contraction tube, 2501-extrusion block, 31-push plate, 32-connecting frame, 33-electric push rod, 34-pressure sensor, 41-fixing plug, 4101-screw thread structure, 4102-discharge channel structure, 42-clamp, 421-rubber sheet, 43-tension spring, 44-lifting and rotating block, 45-wedge ring, 46-fixed frame, 47-first spur gear, 48-driving motor, 49-second spur gear, 5-infusion pump, 51-infusion tube, 52-reflux tube. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with specific embodiments. It should also be noted that, unless otherwise clearly specified and limited, terms such as: setting, installing, connecting, and connecting should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Example 1

[0027] An endoscope support structure testing device, such as Figure 1-Figure 6 As shown, it includes a mounting frame 1, an inlet pipe 21, a middle pipe 22, an exhaust pipe 221, an outlet pipe 23, a terminal pipe 24, a push plate 31, a connecting frame 32, an electric push rod 33, a pressure sensor 34 and a fixing plug 41; the inlet pipe 21, the middle pipe 22 and the outlet pipe 23 are fixedly connected to the mounting frame 1 in sequence, and the middle pipe 22 is located between the inlet pipe 21 and the outlet pipe 23; the inlet pipe 21 and the outlet pipe 23 are both set to simulate the curved pipe cavity structure of the human intestine; the middle pipe 22 is set to simulate the crescent-shaped cavity structure of the human stomach; the two ends of the middle pipe 22 are respectively connected to the inlet pipe 21 and the outlet pipe 23 ; The middle pipe 22 is connected to an exhaust pipe 221; the inlet pipe 21 and the outlet pipe 23 are both made of elastic rubber materials with shrinkage properties; a connecting frame 32 is slidably connected to the middle pipe 22, and a sealing ring is provided at the portion where the middle pipe 22 is penetrated by the connecting frame 32; a push plate 31 is fixedly connected to the connecting frame 32, and the push plate 31 is located inside the middle pipe 22; an electric push rod 33 is installed on the middle pipe 22; the telescopic end of the electric push rod 33 is fixedly connected to the connecting frame 32; two pressure sensors 34 are installed on the push plate 31; the outlet pipe 23 is connected to a terminal pipe 24; a fixing plug 41 is provided at the lower end of the terminal pipe 24.

[0028] like Figure 3-Figure 5As shown, the middle tube 22 is assembled by splicing two front and rear half shells. When the support sleeve of the endoscope is broken, the two half shells constituting the middle tube 22 are directly separated, and the middle tube 22 connected between the inlet tube 21 and the outlet tube 23 can be quickly removed, so that the broken support sleeve of the endoscope can be taken out from the inlet tube 21 and the outlet tube 23 respectively; the middle tube 22 and the terminal tube 24 are made of transparent pipe materials, which is convenient for the staff to observe whether the support sleeve of the endoscope is seriously deformed or damaged in the middle tube 22 and the terminal tube 24; a layer of shrink tube 25 is fixedly connected to the outlet tube 23, and the shrink tube 25 is made of elastic silicone material with shrinkage performance; the inner wall of the shrink tube 25 is provided with a plurality of extrusion blocks 2501 structures.

[0029] First, the endoscope insertion work of an endoscope support structure testing device of the present invention is carried out. The staff inserts one end of the endoscope provided with the lens module into the inlet tube 21, and continues to insert the endoscope into the inlet tube 21, so that the lens module and the support sleeve of the endoscope successively pass through the shrink tube 25 of the inlet tube 21, the middle tube 22, and the outlet tube 23 and then enter the terminal tube 24. The part of the support sleeve of the endoscope located in the middle tube 22 is above the push plate 31. At this time, the support sleeve of the endoscope is bent along the irregular curves of the inlet tube 21, the middle tube 22 and the outlet tube 23 to form a multi-segment tortuous state, simulating the tortuous state formed by the support sleeve of the endoscope being bent in the human stomach and intestines.

[0030] Next, the endoscope insertion and delivery work of the endoscope support structure testing device of the present invention is carried out. The staff connects the exhaust pipe 221 to an exhaust fan, and turns on the external exhaust fan to exhaust the inside of the middle tube 22, the inside of the inlet tube 21, and the inside of the shrink tube 25 in the outlet tube 23 through the exhaust pipe 221, so that the inlet tube 21, the outlet tube 23 and the shrink tube 25 are simultaneously shrunk. Because the support sleeve of the endoscope is not completely filled with the entire inlet tube 21 and the shrink tube 25 before shrinkage, the shrunk inlet tube 21, the outlet tube 23 and the shrink tube 25 will jointly apply squeezing at different angles from all directions to the support sleeve of the endoscope. , thereby simulating the multi-directional extrusion of the support sleeve of the endoscope due to the contraction and distortion of the stomach and intestines. At the same time, the electric push rod 33 pulls the connecting frame 32 to drive the push plate 31 to move upward, and the push plate 31 pushes the support sleeve of the endoscope upward to the middle part of the middle tube 22. At this time, the left and right ends of the support sleeve of the endoscope are respectively clamped by the contracted inlet tube 21 and outlet tube 23. Therefore, the push plate 31 of the support sleeve is pushed upward to stretch the support sleeve of the endoscope, so that the support sleeve of the endoscope can be subjected to tensile test in a complex tortuous state, thereby improving the simulation test effect of the support sleeve of the endoscope being squeezed at different angles in the human stomach and intestine.

[0031] By designing the shrinkage deformation performance of the shrinkage tube 25 to be greater than the shrinkage deformation performance of the inlet tube 21 and the outlet tube 23, after the inlet tube 21, the outlet tube 23 and the shrinkage tube 25 are shrunk, the squeezing pressure of the shrinkage tube 25 on the support sleeve of the endoscope is greater than the squeezing pressure of the inlet tube 21 and the outlet tube 23 on the support sleeve of the endoscope. At this time, the inner wall of the shrinkage tube 25 will apply a stronger squeezing pressure to the support sleeve of the endoscope through the squeezing block 2501, simulating the squeezing of the support sleeve of the endoscope by the organs in the human body through the stomach and intestines when the human body is bent, thereby further improving the simulation test effect.

[0032] Example 2

[0033] On the basis of Example 1, Figure 1-Figure 8 As shown, the fixing plug 41 of this embodiment is rotatably connected to the terminal tube 24; the two clamps 42 are slidably connected through the limiting groove structures on the left and right sides of the fixing plug 41, and the two limiting groove structures on the fixing plug 41 can limit the closing distance of the two clamps 42; a tension spring 43 is fixedly connected between the two clamps 42 and the fixing plug 41; the lower ends of the two clamps 42 are both set as wedge-shaped structures; a fixing frame 46 is fixedly connected to the mounting frame 1; a wedge-shaped squeezing mechanism is connected to the fixing frame 46; the wedge-shaped squeezing mechanism connects the two clamps 42; a rubber sheet 421 is fixedly connected to the upper ends of the opposite sides of the two clamps 42, and when the clamps 42 clamp the endoscope through the rubber sheet 421, the rubber sheet 421 can provide sufficient clamping friction to the endoscope, and at the same time prevent the endoscope from being clamped.

[0034] The wedge-shaped extrusion mechanism includes a lifting rotary block 44, a wedge-shaped ring 45, a first spur gear 47, a driving motor 48 and a second spur gear 49; a screw thread structure 4101 is provided on the fixed plug 41; the lifting rotary block 44 is screwed on the screw thread structure 4101 of the fixed plug 41; a wedge-shaped ring 45 is fixedly connected to the lifting rotary block 44; the wedge-shaped ring 45 is tightly attached to the lower wedge-shaped structure of the two clamping plates 42; the first spur gear 47 is fixedly connected to the fixed plug 41; a driving motor 48 is installed on the fixed frame 46; the output shaft of the driving motor 48 is fixedly connected to the second spur gear 49; the second spur gear 49 is meshed with the first spur gear 47.

[0035] After the insertion and delivery of the endoscope is completed, the lens module of the endoscope is located between the two clamping plates 42, and then the driving motor 48 drives the second spur gear 49 to rotate, and the second spur gear 49 engages with the first spur gear 47 to drive the lifting and lowering rotary block 44 to rotate and move upward along the screw thread structure 4101 of the fixed plug 41, and at the same time, the lifting and lowering rotary block 44 drives the wedge ring 45 to rotate and rise, and the rising wedge ring 45 pushes the two clamping plates 42 to move toward each other along the two limit groove structures of the fixed plug 41 through the wedge structure, and at the same time, the two clamping plates 42 that are approaching each other drive the two rubber sheets 421 to clamp the lens module of the endoscope, and at the same time, the first spur gear 47 drives the fixed plug 41 and the two clamping plates. The plate 42 rotates, and the lens module of the clamped endoscope is driven to rotate by the two clamping plates 42 during the rotation process, and the supporting sleeve connected to the lens module in the endoscope is twisted. At the same time, the tensile test of the endoscope is carried out in combination with the above-mentioned embodiment, and the torsion resistance test of the endoscope is synchronously carried out. The supporting sleeve of the endoscope is twisted and stretched at the same time, simulating the strong lateral pulling force when the supporting sleeve of the endoscope is suddenly stuck after forming a tortuous state in the human stomach and intestines, and observing whether the supporting sleeve of the endoscope is seriously deformed or damaged. The tensile side simulation experiment is carried out on the twisted support sleeve of the endoscope to complete the torsion resistance test of the endoscope support structure.

[0036] Example 3

[0037] On the basis of Example 2, Figure 1-Figure 6 As shown, in this embodiment, an inlet tube 23 is fixedly connected to the outlet tube 23; the outlet end of the inlet tube 231 is connected to the contraction tube 25; a drainage channel structure 4102 is provided on the fixed plug 41; an infusion pump 5 is installed on the mounting frame 1, and the infusion pump 5 is filled with a hydrochloric acid solution simulating gastric acid; the infusion tube 51 is connected between the outlet end of the infusion pump 5 and the inlet end of the inlet tube 231; a reflux tube 52 is fixedly connected to the fixed frame 46; the reflux tube 52 is rotatably connected to the fixed plug 41, and the inlet end of the reflux tube 52 is connected to the drainage channel structure 4102 of the fixed plug 41; the outlet end of the reflux tube 52 is connected to the inlet end of the infusion pump 5; the transparent pipe material used for the terminal tube 24 is a transparent pipe material resistant to hydrochloric acid corrosion.

[0038] During the insertion and delivery of the endoscope, the infusion pump 5 continuously delivers hydrochloric acid solution to the inlet tube 231 through the infusion tube 51. The hydrochloric acid solution enters the contraction tube 25 through the inlet tube 231, and flows downward along the inner wall of the contraction tube 25 through various areas and enters the terminal tube 24. Finally, the hydrochloric acid flows back to the infusion pump 5 along the drainage channel structure 4102 of the fixed plug 41 and the reflux tube 52, so that the inner wall of the contraction tube 25 continuously flows with hydrochloric acid solution simulating the gastric acid corrosion environment. When the endoscope passes through the contraction tube 25, the hydrochloric acid solution on the inner wall of the contraction tube 25 will be continuously coated on the surface of the support sleeve of the endoscope, creating a gastric acid corrosion environment for the surface of the support sleeve of the endoscope. At the same time, combined with the above-mentioned embodiment, the tensile and torsion resistance test work of the endoscope is carried out to observe whether the tensile and torsion resistance of the support sleeve of the endoscope will decrease after being in the gastric acid corrosion environment for a long time, so as to realize the corrosion resistance test work of the support structure of the endoscope.

[0039] During this testing process, since the shrink tube 25 uses elastic silicone material and the terminal tube 24 uses transparent glass material, both the elastic silicone material and the transparent glass material have excellent hydrochloric acid corrosion resistance, the shrink tube 25 and the terminal tube 24 will not be corroded and damaged by hydrochloric acid.

[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An endoscope support structure testing device, comprising: a mounting frame (1); It is characterized in that The device also comprises an inlet pipe (21), a middle pipe (22), an exhaust pipe (221), an outlet pipe (23), a terminal pipe (24), a push plate (31), a connecting frame (32), an electric push rod (33), a pressure sensor (34) and a fixing plug (41); the inlet pipe (21), the middle pipe (22) and the outlet pipe (23) are fixedly connected to the mounting frame (1) in sequence; the inlet pipe (21) and the outlet pipe (23) are both configured as curved pipe cavity structures simulating the human intestine; the middle pipe (22) is configured as a crescent-shaped cavity structure simulating the human stomach; the two ends of the middle pipe (22) are respectively connected to the inlet pipe (21) and the outlet pipe (23); the middle pipe (22) is connected to a pressure sensor (34) and a pressure sensor (34) The invention relates to an air extraction pipe (221); the inlet pipe (21) and the outlet pipe (23) are both made of elastic rubber material; the middle pipe (22) is slidably connected to a connecting frame (32), and a sealing ring is provided at the connecting portion between the middle pipe (22) and the connecting frame (32); a push plate (31) is fixedly connected to the connecting frame (32), and the push plate (31) is located inside the middle pipe (22); an electric push rod (33) is installed on the middle pipe (22); the telescopic end of the electric push rod (33) is fixedly connected to the connecting frame (32); at least one pressure sensor (34) is installed on the push plate (31); the outlet pipe (23) is connected to a terminal pipe (24); and a fixing plug (41) is provided on the terminal pipe (24).

2. The endoscope support structure testing device according to claim 1, characterized in that: The middle pipe (22) is assembled by splicing two front and rear half shells.

3. The endoscope support structure testing device according to claim 1, characterized in that: The middle pipe (22) and the terminal pipe (24) are both made of transparent pipe material.

4. The endoscope support structure testing device according to claim 1, characterized in that: A layer of shrinkable tube (25) is fixedly connected inside the outlet tube (23), and the shrinkable tube (25) is made of elastic silicone material.

5. The endoscope support structure testing device according to claim 4, characterized in that: The inner wall of the shrink tube (25) is provided with a plurality of extrusion blocks (2501) structures.

6. An endoscope support structure testing device according to any one of claims 1 to 5, characterized in that: The fixing plug (41) is rotatably connected to the terminal tube (24); at least two clamping plates (42) are slidably connected to the fixing plug (41); a tension spring (43) is fixedly connected between the clamping plate (42) and the fixing plug (41); the lower end of the clamping plate (42) is set as a wedge-shaped structure; a fixing frame (46) is fixedly connected to the mounting frame (1); a wedge-shaped pressing mechanism for pressing the clamping plate (42) is connected to the fixing frame (46); and the wedge-shaped pressing mechanism connects the two clamping plates (42).

7. The endoscope support structure testing device according to claim 6, characterized in that: The clamping plate (42) is fixedly connected with a rubber sheet (421).

8. The endoscope support structure testing device according to claim 6, characterized in that: The wedge-shaped extrusion mechanism comprises a lifting rotary block (44), a wedge-shaped ring (45), a first spur gear (47), a driving motor (48) and a second spur gear (49); a screw thread structure (4101) is provided on the fixing plug (41); the lifting rotary block (44) is screwed on the screw thread structure (4101) of the fixing plug (41); a wedge-shaped ring (45) is fixedly connected to the lifting rotary block (44); the wedge-shaped ring (45) is tightly attached to two clamping plates (42); the first spur gear (47) is fixedly connected to the fixing plug (41); a driving motor (48) is installed on the fixing frame (46); the output shaft of the driving motor (48) is fixedly connected to the second spur gear (49); the second spur gear (49) is meshed with the first spur gear (47).

9. The endoscope support structure testing device according to claim 8, characterized in that: A circulating infusion mechanism for circulating hydrochloric acid is installed between the mounting frame (1) and the fixing frame (46); a liquid inlet pipe (231) is fixedly connected to the outlet pipe (23); the liquid inlet pipe (231) is connected to the contraction pipe (25); a liquid discharge channel structure (4102) is provided on the fixing plug (41); and the liquid inlet pipe (231) and the liquid discharge channel structure (4102) are connected to the circulating infusion mechanism.

10. The endoscope support structure testing device according to claim 9, characterized in that: The circulating infusion mechanism comprises an infusion pump (5), an infusion tube (51) and a return tube (52); the infusion pump (5) is mounted on the mounting frame (1); the infusion tube (51) is connected between the liquid outlet of the infusion pump (5) and the liquid inlet tube (231); the return tube (52) is fixedly connected to the fixed frame (46); the return tube (52) is rotatably connected to the fixed plug (41), and the return tube (52) is connected to the discharge channel structure (4102) of the fixed plug (41); The reflux pipe (52) is connected to the liquid inlet end of the infusion pump (5); the transparent pipe material used for the terminal pipe (24) is a transparent pipe material.

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