Auxiliary device for PICC (peripherally inserted central catheter)

Abstract

The invention relates to the technical field of medical instruments, in particular to a PICC catheter auxiliary device which comprises a lower shell and an upper shell, a bandage is arranged at the bottom of the lower shell, an inner column is fixedly arranged in the lower shell, a threading inner pipe is arranged in the center of the inner column, a PICC catheter penetrates through the threading inner pipe from the middle, a cutting mechanism is arranged on the upper portion of the inner column, and a cutting mechanism is arranged on the lower portion of the inner column. A clamping assembly and a skin cleaning mechanism are arranged in the inner column; and an inner mounting block is fixedly mounted in the upper shell. When the PICC catheter is used, after catheterization is completed, the PICC catheter penetrates through the threading inner tube, the clamping assembly fixes the PICC catheter, due to the fact that the cutting mechanism is arranged, the redundant part of the PICC catheter can be cut, operation is simpler, then the connecting plug is correspondingly inserted into the threading inner tube to complete butt joint with the PICC catheter, due to the fact that the multifunctional connecting mechanism is arranged, the PICC catheter can be inserted into the threading inner tube, and the PICC catheter can be conveniently and rapidly inserted into the threading inner tube. The functions of medicine application, flushing and blockage elimination can be achieved, and the skin cleaning mechanism is arranged, so that maintenance is more convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a PICC catheter auxiliary device. Background Art

[0002] PICC catheter, full name Peripherally Inserted Central Catheter, is a medical device used for long-term intravenous infusion therapy. PICC catheter is inserted into the superior vena cava near the right atrium through puncture of peripheral veins (such as basilic vein, median cubital vein, cephalic vein, etc.). This method can avoid direct contact between chemotherapy drugs and arm veins and reduce drug stimulation to blood vessels. PICC catheter is mainly used for infusion of drugs and nutrient solution, suitable for patients who need long-term intravenous infusion therapy, such as cancer chemotherapy, total parenteral nutrition, severe infection treatment, etc. There are many advantages in the use of PICC catheter, such as the puncture point is in the peripheral superficial vein during catheterization, avoiding the risks of hemothorax, large blood vessel perforation, etc., and reducing the pain of patients; and PICC catheter operation difficulty is low, the puncture success rate is high, and the impact on daily life is small; and compared with repeated venous puncture, PICC catheter reduces the risk of complications such as phlebitis.

[0003] However, existing PICC catheters are rather cumbersome to use. For example, when inserting the catheter, it is necessary to cut the excess PICC catheter, which requires the use of scissors and other tools, and has certain requirements for the incision. If the PICC catheter is blocked, it needs to be replaced and reinserted. Also, during maintenance, the catheter needs to be flushed and the patient's wound skin needs to be cleaned. During cleaning, it is necessary to stick and remove dressings and fix the catheter, which is cumbersome and increases the workload of medical staff. Summary of the invention

[0004] The object of the present invention is to provide a PICC catheter auxiliary device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a PICC catheter auxiliary device, comprising a lower shell and an upper shell, a binding band is arranged at the bottom of the lower shell, an inner column is fixedly arranged inside the lower shell, a threading inner tube is arranged at the center of the inner column, the threading inner tube is used for the PICC catheter to pass through the middle, a cutting mechanism is arranged at the upper part of the inner column, and a clamping assembly and a skin cleaning mechanism are arranged inside the inner column; An inner mounting block is fixedly installed inside the upper shell, a connecting plug is arranged at the bottom of the inner mounting block, the connecting plug corresponds to the threading inner tube, the connecting plug is inserted into the threading inner tube and connected to the PICC catheter, and a multifunctional connecting mechanism is arranged on the inner mounting block.

[0006] Preferably, a plurality of connecting pins are arranged on the top of the lower shell, and connecting sockets are arranged on the bottom surface of the binding strap, and the connecting pins are correspondingly plugged into the connecting sockets, and a sealing cover is arranged on the top of the upper shell.

[0007] Preferably, there are two straps in total, which are made of elastic material and can be stretched to have a wider range of applications. The surface material of the straps is pure cotton, which is more comfortable to use. One end of the strap is fixedly connected to one side of the bottom of the lower shell, and the other end of the strap is clamped to the other side of the bottom of the lower shell.

[0008] Preferably, the cutting mechanism includes upper slide rails arranged on both sides of the top of the inner column, sliding blocks are slidably arranged inside the two upper slide rails, a shift block is arranged on the top surface of the sliding block and protrudes from the upper slide rails, a connecting spring is connected to one end of the sliding block, an inner push rod is arranged at the other end of the sliding block, a cutting knife group is arranged at the end of the inner push rod, an opening connected to the interior of the upper slide rail is arranged on the side wall of the threading inner tube, and the cutting knife group is located at the opening.

[0009] Preferably, the clamping assembly includes a group of internal fixing plates embedded in the inner walls of both sides of the threading inner tube, the internal fixing plates are two arc-shaped plates, and a circular hole is formed in the middle of the two arc-shaped plates. The PICC catheter passes through the circular hole, and the PICC catheter is tightly attached to the inner wall of the circular hole. A plurality of fixed suction holes are arranged on the inner wall of the internal fixing plate.

[0010] Preferably, the skin cleaning mechanism includes a sliding sleeve, which is slidably sleeved on the outer wall of the threading inner tube, two side panels are arranged on the two side walls of the lower end of the sliding sleeve, and a cleaning cloth is arranged on the bottom surface of the side panel. The cleaning cloth contains medical alcohol and can be used to disinfect and clean the skin near the wound, and the cleaning cloth can be attached to the bottom surface of the side panel by a structure such as Velcro for easy replacement, a driven gear ring is arranged on the top side wall of the sliding sleeve, a bearing sleeve is arranged on the middle side wall of the sliding sleeve, a lifting push rod is installed inside the inner column, one end of the lifting push rod is connected to a driving motor, and an output end of the driving motor is connected to a driving gear, the driving gear and the driven gear ring are meshed and connected, the bottom end housing of the driving motor and the outer ring of the bearing sleeve are fixedly connected, the driving motor and the bearing sleeve can move up and down synchronously, so that the driving gear and the bearing sleeve always maintain a meshed connection state.

[0011] Preferably, the multifunctional connecting mechanism includes a rotating mounting disk, a docking hole is opened on one side wall of the rotating mounting disk, the connecting sleeve is rotatably sleeved on the rotating mounting disk through a sealed bearing, an adjusting motor is arranged inside the inner mounting block, the output end of the adjusting motor is connected to the rotating mounting disk, the inner wall of the connecting sleeve and the side surface of the rotating mounting disk are tightly fitted, and three liquid holes are opened on the connecting sleeve, and the three liquid holes are respectively connected to the first connecting tube, the second connecting tube and the third connecting tube.

[0012] Preferably, the first connecting pipe is connected to a liquid injection head, and the liquid injection head protrudes from a sealing cover on the top of the upper shell.

[0013] Preferably, the second connecting tube is connected to a liquid storage tank, which is filled with flushing liquid, which may be physiological saline, for flushing the PICC catheter. A pump is installed in the liquid storage tank, and the liquid outlet of the pump is connected to the second connecting tube.

[0014] Preferably, the third connecting pipe is connected to a negative pressure bin, a movable head is movably provided in the negative pressure bin, one end of the movable head is connected to a traction frame, a threaded sleeve is provided on the traction frame, a traction motor is installed inside the negative pressure bin, the output end of the traction motor is connected to a screw rod, the screw rod passes through the traction frame and is connected with the threaded sleeve, a liquid storage tank is provided on one side of the negative pressure bin, a one-way valve is provided at the connection between the third connecting pipe and the negative pressure bin, so that liquid or gas can only enter the negative pressure bin from the third connecting pipe, and a one-way valve is also provided at the connection between the liquid storage tank and the negative pressure bin, so that the gas or liquid in the negative pressure bin can only enter the liquid storage tank from the negative pressure bin, when the traction motor is started, it can circulate in forward and reverse directions, extract gas or liquid from the third connecting pipe and directly inject it into the liquid storage tank, and the liquid storage tank can be expanded and retracted and can be directly unscrewed and replaced after it is full.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. A PICC catheter auxiliary device proposed by the present invention, when using a PICC catheter, after the catheter is placed, the PICC catheter is passed through the threading inner tube, and the clamping assembly fixes the PICC catheter. Moreover, since a cutting mechanism is provided, the redundant part of the PICC catheter can be cut, and the operation is simpler. Then, the connecting plug is correspondingly plugged into the threading inner tube to complete the docking with the PICC catheter. Since a multifunctional connecting mechanism is provided, the functions of medication, flushing and eliminating blockage can be realized, and a skin cleaning mechanism is provided, which is more convenient for maintenance.

[0016] 2. Because of the multifunctional connecting mechanism, when taking medicine, the medicine is injected into the medicine by opening the injection head, and the adjusting motor is started to drive the rotating mounting plate to rotate, so that the docking hole and the first connecting tube are aligned, and the medicine can enter the PICC catheter; when the PICC catheter is blocked, the adjusting motor is controlled to start, and the equipment clearing mode can make the rotating mounting plate rotate, and the docking hole and the third connecting tube are aligned. At this time, the traction motor is started to drive the screw rod to rotate and pull the traction frame, so that the traction frame pulls the movable head and then the end of the negative pressure chamber enters a negative pressure state, so that the PICC catheter is sucked through the third connecting tube, and then Clear the blockage of the PICC catheter; when maintenance is required, the PICC catheter needs to be flushed, and the maintenance mode is entered through the control device. The motor is adjusted to drive the rotating mounting plate to rotate so that the docking hole and the second connecting pipe are aligned. The pump inside the liquid storage tank extracts the cleaning liquid to flush the PICC catheter. At the same time, the skin cleaning mechanism is started, and the lifting push rod pushes the drive motor downward, thereby lowering the bearing sleeve, sliding sleeve and side plate structures. Then the drive motor is started to drive the sliding sleeve and side plate to rotate through the engagement of the active gear and the driven gear ring. The side plate can clean and disinfect the skin around the wound, which is more convenient to use and greatly reduces the workload of medical staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the device of the present invention.

[0018] Figure 2 Schematic diagram of the interior of the device of the present invention.

[0019] Figure 3 It is a schematic diagram of the lower shell structure of the present invention.

[0020] Figure 4 It is a schematic diagram of the inner column structure of the present invention.

[0021] Figure 5 It is the structural diagram of the cutting mechanism of the present invention.

[0022] Figure 6 This is a structural diagram of the clamping assembly of the present invention.

[0023] Figure 7 It is a schematic diagram of the structure of a single internal fixing plate of the present invention.

[0024] Figure 8 This is a bottom perspective view of the inner column of the present invention.

[0025] Fig. 9 This is a structural diagram of the skin cleaning mechanism of the present invention.

[0026] Fig.10 This is a structural diagram of the multifunctional connecting mechanism of the present invention.

[0027] Fig.11This is a diagram of the connection structure of the rotating mounting disk of the present invention.

[0028] Fig.12 This is a structural diagram of the negative pressure chamber of the present invention.

[0029] In the figure: lower shell 1, connecting column 101, binding strap 2, upper shell 3, inner column 4, threading inner tube 5, upper slide rail 6, sliding block 7, connecting spring 8, inner push rod 9, cutting knife group 10, inner fixed plate 11, fixed suction hole 12, sliding sleeve 13, side plate 14, driven gear ring 15, bearing sleeve 16, driving motor 17, driving gear 18, lifting push rod 19, inner mounting block 20, connecting plug 21, adjusting motor 22, rotating mounting disk 23, docking hole 24, connecting sleeve 25, first connecting pipe 26, injection head 27, second connecting pipe 28, liquid storage bin 2801, third connecting pipe 29, negative pressure bin 30, movable head 31, traction frame 32, traction motor 33, screw 34, liquid storage tank 35. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figures 1 to 12 The present invention provides a technical solution: a PICC catheter auxiliary device. The device can be powered by a battery or an external plug. The specific internal circuit structure is basically common knowledge in the field, so it will not be described here. The device of the present invention includes a lower shell 1 and an upper shell 3. The top of the lower shell 1 is provided with a plurality of connecting pins 101. The bottom surface of the bandage 2 is provided with a connecting jack. The connecting pins 101 are correspondingly plugged into the connecting jack. The top of the upper shell 3 is provided with a sealing cover. The bottom of the lower shell 1 is provided with a bandage 2. There are two bandages 2. The bandage 2 is made of elastic material and can be retracted and applied in a wider range. The surface material of the bandage 2 is pure cotton, which is more comfortable to use. One end of the bandage 2 is fixedly connected to one side of the bottom of the lower shell 1, and the other end of the bandage 2 is clamped to the other side of the bottom of the lower shell 1.

[0032] An inner column 4 is fixedly arranged inside the lower shell 1, and a threading inner tube 5 is arranged at the center of the inner column 4. The threading inner tube 5 is used for the PICC catheter to pass through the middle. A cutting mechanism is arranged on the upper part of the inner column 4. The cutting mechanism includes upper slide rails 6 arranged on both sides of the top of the inner column 4, and a sliding block 7 is slidably arranged inside the two upper slide rails 6. The top surface of the sliding block 7 is provided with a shifting block and protrudes from the upper slide rail 6. A connecting spring 8 is connected to one end of the sliding block 7, and an inner push rod 9 is arranged at the other end of the sliding block 7. A cutting knife group 10 is arranged at the end of the inner push rod 9. An opening connected to the inside of the upper slide rail 6 is arranged on the side wall of the threading inner tube 5, and the cutting knife group 10 is located at the opening. After the PICC catheter is fixed, the cutting mechanism can be used to cut off the excess PICC catheter. The shifting blocks at both ends are pushed by hand to move the sliding block 7, so that the inner push rod 9 can push the cutting knife group 10, and the cutting knife group 10 cuts off the PICC catheter through the opening. The inner push rod 9 resets the sliding block 7, and the excess PICC catheter is removed to complete the cutting.

[0033] A clamping assembly and a skin cleaning mechanism are arranged inside the inner column 4; the clamping assembly includes a group of inner fixing plates 11 embedded in the inner walls of both sides of the threading inner tube 5, the inner fixing plates 11 are two arc-shaped plates, and a circular hole is formed in the middle of the two arc-shaped plates. The PICC catheter passes through the circular hole, and the PICC catheter is tightly attached to the inner wall of the circular hole, but can slide. A plurality of fixed suction holes 12 are arranged on the inner wall of the inner fixing plate 11. When the fixed suction holes 12 suck the wall of the PICC catheter, it can be fixed. When the fixed suction holes 12 are controlled to stop the adsorption, the PICC catheter can be released. The skin cleaning mechanism includes a sliding sleeve 13, which is slidably sleeved on the outer wall of the threading inner tube 5. Two side panels 14 are arranged on the two side walls of the lower end of the sliding sleeve 13. A cleaning cloth is arranged on the bottom surface of the side panel 14. The cleaning cloth contains medical alcohol and can be used to disinfect and clean the skin near the wound. The cleaning cloth can be pasted on the bottom surface of the side panel 14 through structures such as Velcro for easy replacement. A driven gear ring 15 is arranged on the top side wall of the sliding sleeve 13, and a bearing sleeve 16 is arranged on the middle side wall of the sliding sleeve 13. A lifting push rod 19 is installed inside the inner column 4, and one end of the lifting push rod 19 is connected to a driving motor 17. The output end of the driving motor 17 is connected to a driving gear 18, and the driving gear 18 is meshedly connected with the driven gear ring 15. The bottom end housing of the driving motor 17 is fixedly connected to the outer ring of the bearing sleeve 16, and the driving motor 17 and the bearing sleeve 16 can move up and down synchronously, so that the driving gear 18 and the bearing sleeve 16 always maintain a meshed connection state.

[0034] An inner mounting block 20 is fixedly installed inside the upper shell 3, and a connecting plug 21 is provided at the bottom of the inner mounting block 20. The connecting plug 21 corresponds to the threading inner tube 5. The connecting plug 21 is inserted into the threading inner tube 5 and connected to the PICC catheter. A multifunctional connecting mechanism is provided on the inner mounting block 20.

[0035] The multifunctional connecting mechanism includes a rotating mounting disk 23, a docking hole 24 is opened on one side wall of the rotating mounting disk 23, a connecting sleeve 25 is rotatably sleeved on the rotating mounting disk 23 through a sealed bearing, an adjusting motor 22 is arranged inside the inner mounting block 20, the output end of the adjusting motor 22 is connected to the rotating mounting disk 23, the inner wall of the connecting sleeve 25 and the side surface of the rotating mounting disk 23 are tightly fitted, and three liquid holes are opened on the connecting sleeve 25, and the three liquid holes are respectively connected to the first connecting pipe 26, the second connecting pipe 28 and the third connecting pipe 29. The first connecting tube 26 is connected to a liquid injection head 27, which protrudes from the sealing cover on the top of the upper shell 3 and is inserted into the hole of the sealing cover; the second connecting tube 28 is connected to a liquid storage bin 2801, in which a flushing liquid is contained. The flushing liquid can be physiological saline and is used to flush the PICC catheter. A pump is installed in the liquid storage bin 2801, and the liquid outlet of the pump is connected to the second connecting tube 28; the third connecting tube 29 is connected to a negative pressure bin 30, in which a movable head 31 is movably arranged, and one end of the movable head 31 is connected to a traction frame 32, on which a threaded sleeve is arranged, and a traction motor 33 is installed inside the negative pressure bin 30, and the output end of the traction motor 33 is connected to a screw rod. 34. The screw rod 34 passes through the traction frame 32 and is connected with the threaded sleeve. A liquid storage tank 35 is arranged on one side of the negative pressure bin 30. A one-way valve is arranged at the connection between the third connecting pipe 29 and the negative pressure bin 30, so that liquid or gas can only enter the negative pressure bin 30 from the third connecting pipe 29. A one-way valve is also arranged at the connection between the liquid storage tank 35 and the negative pressure bin 30, so that the gas or liquid in the negative pressure bin 30 can only enter the liquid storage tank 35 from the negative pressure bin 30. When the traction motor 33 is started, it can rotate in forward and reverse directions, extract gas or liquid from the third connecting pipe 29 and directly inject it into the liquid storage tank 35. The liquid storage tank 35 can be expanded and retracted and can be directly unscrewed and replaced after it is full.

[0036] When taking medicine, the medicine is injected into the medicine by opening the injection head 27, and the adjusting motor 22 is started to drive the rotating mounting disk 23 to rotate, so that the docking hole 24 and the first connecting tube 26 are aligned, so that the medicine can enter the PICC catheter; when the PICC catheter is blocked, the adjusting motor 22 is controlled to start, and the device clearing mode can make the rotating mounting disk 23 rotate, and the docking hole 24 and the third connecting tube 29 are aligned. At this time, the traction motor 33 is started to drive the screw rod 34 to rotate and pull the traction frame 32, so that the traction frame 32 pulls the movable head 31 and then makes the end of the negative pressure chamber 30 enter a negative pressure state, so that the PICC catheter is sucked through the third connecting tube 29, and then the PICC catheter is cleared. blockage; when it is necessary to flush the PICC catheter during maintenance, the maintenance mode is performed by controlling the device, adjusting the motor 22 to drive the rotating mounting plate 23 to rotate so that the docking hole 24 and the second connecting pipe 28 are aligned, and the pump inside the liquid storage tank 2801 extracts the cleaning liquid to flush the PICC catheter. At the same time, the skin cleaning mechanism is started, and the lifting push rod 19 pushes the drive motor 17 downward, thereby causing the bearing sleeve 16, the sliding sleeve 13 and the side plate 14 to descend. Then the drive motor 17 is started to drive the sliding sleeve 13 and the side plate 14 to rotate through the engagement of the driving gear 18 and the driven gear ring 15. The side plate 14 can clean and disinfect the skin around the wound, which is more convenient to use and greatly reduces the workload of medical staff.

[0037] During actual use, the PICC catheter that has been placed is passed through the threading inner tube 5, and the lower shell 1 is pressed against the patient's arm. The lower shell 1 is then tied to the arm using the bandage 2. The PICC catheter passes through the threading inner tube 5 and the internal fixing plate 11. At this time, the fixed suction hole 12 sucks the outer wall of the PICC catheter to fix it. The excess PICC catheter is then cut off using the cutting mechanism. The sliding blocks 7 are pushed by hand at both ends to move the sliding block 7, so that the inner push rod 9 pushes the cutting knife group 10. The cutting knife group 10 cuts off the PICC catheter through the opening, and the inner push rod 9 resets the sliding block 7. The excess PICC catheter is removed to complete the cutting. The connecting plug 21 is then correspondingly inserted into the threading inner tube 5, and the bottom of the connecting plug 21 is inserted into the PICC catheter to complete docking with it. At the same time, the connecting column 101 is inserted into the docking jack, and the lower shell 1 and the upper shell 3 are fixedly connected.

[0038] Because a multifunctional connecting mechanism is provided, when taking medicine, the medicine is injected into the medicine by opening the injection head 27, and the adjusting motor 22 is started to drive the rotating mounting disk 23 to rotate, so that the docking hole 24 and the first connecting tube 26 are aligned, so that the medicine can enter the PICC catheter; when the PICC catheter is blocked, the adjusting motor 22 is controlled to start, and the device clearing mode can make the rotating mounting disk 23 rotate, and the docking hole 24 and the third connecting tube 29 are aligned. At this time, the traction motor 33 is started to drive the screw rod 34 to rotate and pull the traction frame 32, so that the traction frame 32 pulls the movable head 31 and then makes the end of the negative pressure chamber 30 enter a negative pressure state, so that the PICC catheter is sucked through the third connecting tube 29, and then cleared. Blockage of the PICC catheter; when maintenance is required, the PICC catheter needs to be flushed, and the maintenance mode is performed by controlling the device, adjusting the motor 22 to drive the rotating mounting plate 23 to rotate so that the docking hole 24 and the second connecting pipe 28 are aligned, and the pump inside the liquid storage tank 2801 extracts the cleaning liquid to flush the PICC catheter. At the same time, the skin cleaning mechanism is started, and the lifting push rod 19 pushes the drive motor 17 downward, thereby causing the bearing sleeve 16, the sliding sleeve 13 and the side plate 14 to descend. Then the drive motor 17 is started to drive the sliding sleeve 13 and the side plate 14 to rotate through the engagement of the driving gear 18 and the driven gear ring 15. The side plate 14 can clean and disinfect the skin around the wound, which is more convenient to use and greatly reduces the workload of medical staff.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A PICC catheter auxiliary device, comprising a lower housing (1) and an upper housing (3), characterized in that: The bottom of the lower shell (1) is provided with a binding band (2), an inner column (4) is fixedly provided inside the lower shell (1), a threading inner tube (5) is provided at the center of the inner column (4), the threading inner tube (5) is used for the PICC catheter to pass through the middle, a cutting mechanism is provided on the upper part of the inner column (4), and a clamping assembly and a skin cleaning mechanism are provided inside the inner column (4); An inner mounting block (20) is fixedly mounted inside the upper housing (3); a connecting plug (21) is arranged at the bottom of the inner mounting block (20); the connecting plug (21) corresponds to the threading inner tube (5); the connecting plug (21) is inserted into the threading inner tube (5) and is connected to the PICC catheter; a multifunctional connecting mechanism is arranged on the inner mounting block (20).

2. A PICC catheter auxiliary device according to claim 1, characterized in that: A plurality of connection pins (101) are arranged on the top of the lower shell (1), a connection socket is arranged on the bottom surface of the binding belt (2), the connection pins (101) are correspondingly plugged into the connection socket, and a sealing cover is arranged on the top of the upper shell (3).

3. A PICC catheter auxiliary device according to claim 1, characterized in that: Two straps (2) are provided in total. The straps (2) are made of elastic material. One end of the strap (2) is fixedly connected to one side of the bottom of the lower shell (1), and the other end of the strap (2) is clamped to the other side of the bottom of the lower shell (1).

4. A PICC catheter auxiliary device according to claim 1, characterized in that: The cutting mechanism comprises upper slide rails (6) arranged on both sides of the top of the inner column (4), sliding blocks (7) are slidably arranged inside the two upper slide rails (6), a shifting block is arranged on the top surface of the sliding block (7) and protrudes from the upper slide rails (6), a connecting spring (8) is connected to one end of the sliding block (7), an inner push rod (9) is arranged at the other end of the sliding block (7), a cutting knife group (10) is arranged at the end of the inner push rod (9), and an opening connected to the interior of the upper slide rails (6) is arranged on the side wall of the threading inner tube (5), and the cutting knife group (10) is located at the opening.

5. A PICC catheter auxiliary device according to claim 1, characterized in that: The clamping assembly comprises a group of inner fixing plates (11) embedded in the inner walls of both sides of the threading inner tube (5), the inner fixing plates (11) being two arc-shaped plates, the two arc-shaped plates being butted together to form a circular hole in the middle, the PICC catheter passing through the circular hole, and the PICC catheter being closely attached to the inner wall of the circular hole, and a plurality of fixing suction holes (12) are arranged on the inner wall of the inner fixing plate (11).

6. A PICC catheter auxiliary device according to claim 1, characterized in that: The skin cleaning mechanism comprises a sliding sleeve (13), the sliding sleeve (13) being slidably sleeved on the outer wall of the threading inner tube (5), two side plates (14) being arranged on the two side walls of the lower end of the sliding sleeve (13), a cleaning cloth being arranged on the bottom surface of the side plates (14), a driven gear ring (15) being arranged on the top side wall of the sliding sleeve (13), a bearing sleeve (16) being arranged on the middle side wall of the sliding sleeve (13), a lifting push rod (19) being installed inside the inner column (4), one end of the lifting push rod (19) being connected to a driving motor (17), an output end of the driving motor (17) being connected to a driving gear (18), the driving gear (18) being meshingly connected to the driven gear ring (15), and a bottom end housing of the driving motor (17) being fixedly connected to an outer ring of the bearing sleeve (16).

7. A PICC catheter auxiliary device according to claim 1, characterized in that: The multifunctional connecting mechanism comprises a rotating mounting plate (23), a docking hole (24) is provided on a side wall of the rotating mounting plate (23), a connecting sleeve (25) is rotatably sleeved on the rotating mounting plate (23) via a sealing bearing, an adjusting motor (22) is arranged inside the inner mounting block (20), an output end of the adjusting motor (22) is connected to the rotating mounting plate (23), an inner wall of the connecting sleeve (25) and a side surface of the rotating mounting plate (23) are tightly fitted, and three liquid passing holes are provided on the connecting sleeve (25), and the three liquid passing holes are respectively connected to a first connecting pipe (26), a second connecting pipe (28) and a third connecting pipe (29).

8. A PICC catheter auxiliary device according to claim 7, characterized in that: The first connecting pipe (26) is connected to a liquid injection head (27), and the liquid injection head (27) protrudes from a sealing cover at the top of the upper shell (3).

9. A PICC catheter auxiliary device according to claim 7, characterized in that: The second connecting pipe (28) is connected to a liquid storage tank (2801), the liquid storage tank (2801) is filled with flushing liquid, a pump is installed in the liquid storage tank (2801), and the liquid outlet of the pump is connected to the second connecting pipe (28).

10. A PICC catheter auxiliary device according to claim 7, characterized in that: The third connecting pipe (29) is connected to a negative pressure chamber (30), a movable head (31) is movably arranged in the negative pressure chamber (30), one end of the movable head (31) is connected to a traction frame (32), a threaded sleeve is arranged on the traction frame (32), a traction motor (33) is installed inside the negative pressure chamber (30), an output end of the traction motor (33) is connected to a screw rod (34), the screw rod (34) passes through the traction frame (32) and is cooperatively connected to the threaded sleeve, and a liquid storage tank (35) is arranged on one side of the negative pressure chamber (30).

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