CN114917095A

CN114917095A - Arm fixing device and special bed for placing central venous catheter through peripheral vein

Info

Publication number: CN114917095A
Application number: CN202111538905.0A
Authority: CN
Inventors: 朱健; 赵玉桃; 鞠俊强
Original assignee: Taizhou Peoples Hospital
Current assignee: Taizhou Peoples Hospital
Priority date: 2021-12-15
Filing date: 2021-12-15
Publication date: 2022-08-19
Anticipated expiration: 2041-12-15
Also published as: CN114917095B

Abstract

The invention relates to an arm fixing device and a special bed for placing a central venous catheter through a peripheral vein. The arm fixing device comprises an installation control platform and an arm restraint fixer, the installation control platform comprises a control console, a fixer operating mechanism and a fixer mounting plate, the fixer operating mechanism is installed in the control console, the fixer mounting plate is installed at the output end of the fixer operating mechanism, the arm restraint fixer is installed on the fixer mounting plate, the fixer operating mechanism is used for driving the arm restraint fixer to move out to the bed side or reversely move to the bottom of the bed from the bed below the tube placing bed in an outward motion mode, the arm restraint fixer comprises a U-shaped installation frame, an upper arm support, an upper arm fixing plate, an upper arm restraint belt, a forearm support, a forearm fixing plate and a forearm restraint belt. The special bed comprises a tube placing bed, and the bed legs on two sides of the head end of the tube placing bed are respectively provided with an arm fixing device. The invention can properly fix the arm at the implantation side during the tube implantation, and can lead an operator to conveniently rotate the wrist of the patient to adjust the angle.

Description

Arm fixing device and special bed for implanting central venous catheter through peripheral vein

Technical Field

The invention relates to an arm fixing device and a special bed for placing a central venous catheter through a peripheral vein, belonging to the technical field of medical instruments.

Background

With the progress of medical technology and technology level, the nursing operation capacity of nurses is gradually improved, and the technology of central vein catheterization through peripheral venipuncture in clinic, such as arm infusion port, PICC and the like, is also gradually popularized. In the process of placing the central venous catheter, the patient needs to be matched, the arm on the placing side needs to be unfolded for about 90 degrees, meanwhile, the arm needs to be turned over for matching operation, and the body position needs to be kept for a long time. Currently, most clinical nurses perform this operation in dedicated catheterization rooms, but there are no dedicated catheterization apparatuses. In clinical operation, a patient can lie along the bed along the opposite sides of the implantation side in a clinging manner, and the arm of the implantation side can be extended as much as possible, but the potential safety hazard is large, the implantation space is limited, and the sterile area is easily polluted. And a small platform with the same height as the bed is additionally arranged at the bedside to solve the problem of operation space, but the problem that the patient cannot cooperate with the rotating wrist is caused, and the optimal puncture position is difficult to achieve. The reasonable placement of the body position is one of the important reasons for successful tube placement, but in the prior art, due to the lack of a special tube placement tool, the tube placement operation time is usually long, the patient needs to have high adaptability, and many patients who are old and weak, or have unconsciousness and dysphoria cannot smoothly complete the operation in a matched manner.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides an arm fixing device for implanting a central venous catheter through a peripheral vein and a special bed.

The first purpose of the invention is realized by the following technical scheme:

the arm fixing device comprises an installation control platform and an arm restraint fixer, wherein the installation control platform comprises a control rack, a fixer operating mechanism and a fixer mounting plate, the control rack is used for being installed on a tube placing bed, the fixer operating mechanism is installed in the control rack, the fixer mounting plate is installed at the output end of the fixer operating mechanism, the arm restraint fixer is installed on the fixer mounting plate, and the fixer operating mechanism is used for driving the arm restraint fixer to move outwards from the bottom of the tube placing bed to move out to the side of the bed or reversely move from the side of the bed to the bottom of the bed; the arm restraint fixator comprises a U-shaped mounting frame, an upper arm support, an upper arm fixing plate, an upper arm restraint belt, a forearm support, a forearm fixing plate and a forearm restraint belt, wherein the bottom of the U-shaped mounting frame is fixedly mounted on the fixator mounting plate, the rear end of the upper arm support is mounted at the upper end of a rear fork arm of the U-shaped mounting frame through a first bolt shaft capable of being adjusted in an elastic manner, the front end of the upper arm support is mounted at the upper end of a front fork arm of the U-shaped mounting frame through a second bolt shaft capable of being adjusted in an elastic manner, and the upper arm support can be adjusted in a rotating manner around the first bolt shaft and the second bolt shaft; the upper arm fixing plate is mounted on the upper arm support, an upper arm restraint belt is mounted on the side edge of the upper arm fixing plate, the rear end of the forearm support is hinged with the front end of the upper arm support through a belt locking hinge assembly, and the upper arm support of the forearm support can rotate relatively to adjust; the forearm fixing plate is arranged on the forearm support, and a forearm restraint strap is arranged on the side edge of the forearm fixing plate.

As a further improvement of the arm fixing device, the upper arm support comprises a first rear fixing piece, a first front fixing piece and two first slide bars, the two first slide bars are arranged in parallel, the first rear fixing piece is fixedly installed at the rear ends of the two first slide bars, the first front fixing piece is fixedly installed at the front ends of the two first slide bars, two first slide cylinders are arranged at the bottom of the upper arm fixing plate, the two first slide cylinders are respectively installed on the two first slide bars in a sliding manner, and each first slide cylinder is provided with a first locking hand wheel for locking the first slide bar; the front arm support comprises a second rear fixing piece, a second front fixing piece and two second slide bars, the two second slide bars are arranged in parallel and side by side, the second rear fixing piece is fixedly mounted at the rear ends of the two second slide bars, the second front fixing piece is fixedly mounted at the front ends of the two second slide bars, two second sliding barrels are arranged at the bottom of the front arm fixing plate, the two second sliding barrels are respectively slidably mounted on the two second slide bars, and a second locking hand wheel used for tightly fixing the second slide bars is mounted on each second sliding barrel; the belt locking hinge assembly is mounted on the first front fixing plate and the second rear fixing plate.

As a further improvement of the arm fixing device, the assembly with locking hinge comprises two first hinge connecting rods, two second hinge connecting rods, a hinge shaft and a third locking hand wheel, the two first hinge connecting rods are fixedly mounted on the first front fixing plate, the two second hinge connecting rods are fixedly mounted on the second front fixing plate, the two first hinge connecting rods and the two second hinge connecting rods are hinged through the hinge shaft, and the third locking hand wheel is mounted at the end of the hinge shaft.

As a further improvement of the arm fixing device, the arm restraint fixator further comprises a hand fixing plate, a hand restraint belt, two cylinder sliding seats, a fourth locking hand wheel and a fifth locking hand wheel, wherein the two cylinder sliding seats are slidably mounted at the front parts of the two second sliding rods, the two cylinder sliding seats are provided with the two fourth locking hand wheels for tightly fixing the second sliding rods, the upper surfaces of the two cylinder sliding seats are provided with ball socket seats, the lower surfaces of the hand fixing plate are provided with ball heads, the ball heads are mounted in the ball socket seats, the fifth locking hand wheel for tightly fixing the ball heads is mounted at the positions, corresponding to the ball socket seats, of the bottoms of the two cylinder sliding seats, and the hand restraint belt is mounted on the side edge of the hand fixing plate.

As a further improvement of the arm fixing device, one end of the control console is provided with a mounting hole site, and a bed leg connecting cylinder is rotatably mounted in the mounting hole site; the fixer operating mechanism comprises a driving motor, a driving gear, a fixed cylinder gear, a vertical guide rod and a lifting driving part, wherein the driving motor is arranged beside the bed leg connecting cylinder; the other end of the control rack is provided with a lifting driving component, the fixer mounting plate is fixedly mounted at the upper end of the lifting driving component, the vertical guide rod is arranged in the control rack in a sliding and penetrating mode, and the upper end of the vertical guide rod is fixedly connected to the bottom of the fixer mounting plate.

As a further improvement of the arm fixing device, a universal supporting wheel is arranged on the bottom surface of the control console frame.

As a further improvement of the arm fixing device, the lifting driving part adopts an electric push rod, a screw rod lifter or an air cylinder.

The second purpose of the invention is realized by the following technical scheme:

the special bed for placing the central venous catheter through the peripheral vein comprises a catheter placing bed and is characterized in that: the arm fixing devices are respectively installed on the bed legs on the two sides of the head end of the pipe placing bed, and a control rack in the arm fixing devices is rotatably connected to the bed legs.

Compared with the prior art, the invention has the following advantages:

the wrist fixing device has the advantages that the structure is ingenious, the design is reasonable, the angle between the arm and the body of a patient can be electrically adjusted through the arm fixing device, an operator can conveniently and randomly adjust the angle according to the requirement of placing the tube when placing the tube, and the wrist fixing device is provided with a part for fixing the wrist so as to prevent the wrist of the patient which is not matched from randomly moving; arm fixing device is hidden design, can conveniently shift out from under the bed when needs use, shifts out the operation moreover and adopts electronic regulation and control to can finely tune the angle, it is not only convenient, and the accuracy is high moreover, and arm fixing device bottom has universal supporting wheel to provide the support, and is stable firm, and guarantee safety can effectively prevent to put tub in-process patient transform position and arouse the puncture failure.

Drawings

Fig. 1 is a front view of the structure of embodiment 1 of the present invention.

Fig. 2 is a bottom view of the arm restraining fixture according to embodiment 1 of the present invention.

FIG. 3 is a view showing the direction A-A in FIG. 1 according to embodiment 1 of the present invention.

Fig. 4 is a schematic structural diagram of embodiment 2 of the present invention.

Description of reference numerals: 1-control stand, 2-fixer mounting plate, 3-U-shaped mounting rack, 4-upper arm support, 4.1-first rear fixing plate, 4.2-first front fixing plate, 4.3-first slide bar, 4.4-first locking hand wheel, 5-upper arm fixing plate, 5 a-first sliding barrel, 6-upper arm restraint belt, 7-forearm support, 7.1-second rear fixing plate, 7.2-second front fixing plate, 7.3-second slide bar, 7.4-second locking hand wheel, 8-forearm fixing plate, 8 a-second sliding barrel, 9-forearm restraint belt, 10-first bolt shaft, 11-second bolt shaft, 12-first hinge connecting rod, 13-second hinge connecting rod, 14-hinge shaft, 15-third locking hand wheel, 16-hand fixing plate, 16 a-a ball head, 17-a hand restraint strap, 18-a double-cylinder sliding seat, 18 a-a ball socket seat, 19-a fourth locking hand wheel, 20-a fifth locking hand wheel, 21-a bed leg connecting cylinder, 22-a driving motor, 23-a driving gear, 24-a fixed cylinder gear, 25-a vertical guide rod, 26-a lifting driving part, 27-a universal supporting wheel, 28-a storage battery and 29-a tube placing bed.

Detailed Description

The invention is further illustrated by the following specific figures and examples.

Example 1

As shown in fig. 1 to 3, embodiment 1 discloses an arm fixing device for placing a central venous catheter via a peripheral vein, which comprises a mounting console and an arm constraint fixator, wherein the mounting console comprises a console frame 1, a fixator manipulation mechanism and a fixator mounting plate 2, the console frame 1 is used for being mounted on a catheterization bed 29, the fixator manipulation mechanism is mounted in the console frame 1, the fixator mounting plate 2 is mounted at the output end of the fixator manipulation mechanism, the arm constraint fixator is mounted on the fixator mounting plate 2, and the fixator manipulation mechanism is used for driving the arm constraint fixator to move outwards from the bed of the catheterization bed 29 to the bed side or reversely from the bed side to the bed bottom; the arm restraint fixator comprises a U-shaped mounting frame 3, an upper arm support 4, an upper arm fixing plate 5, an upper arm restraint belt 6, a forearm support 7, a forearm fixing plate 8 and a forearm restraint belt 9, wherein the bottom of the U-shaped mounting frame 3 is fixedly mounted on the fixator mounting plate 2, the rear end of the upper arm support 4 is mounted at the upper end of a rear fork arm of the U-shaped mounting frame 3 through a first bolt shaft 10 which can be adjusted in an elastic manner, the front end of the upper arm support 4 is mounted at the upper end of a front fork arm of the U-shaped mounting frame 3 through a second bolt shaft 11 which can be adjusted in an elastic manner, and the upper arm support 4 can be adjusted in a rotating manner around the first bolt shaft 10 and the second bolt shaft 11; the upper arm fixing plate 5 is installed on the upper arm support 4, an upper arm restraint belt 6 is installed on the side edge of the upper arm fixing plate 5, the rear end of the forearm support 7 is hinged with the front end of the upper arm support 4 through a belt locking hinge assembly, and the forearm support 7 and the upper arm support 4 can be adjusted in a relative rotation mode; the forearm fixing plate 8 is arranged on the forearm support 7, and a forearm restraint strap 9 is arranged on the side edge of the forearm fixing plate 8.

When the device is used specifically, the arm fixing device is initially positioned under a bed of a tube placing bed 29, when tube placing operation is needed, a fixer operating mechanism in the mounting control console is started to drive the fixer mounting plate 2 and the arm constraint fixer to rotate outwards from the lower part of the bed, after the fixer mounting plate 2 and the arm constraint fixer are moved out to a proper position, the fixer operating mechanism drives the arm constraint fixer to lift upwards to a proper height, and then medical personnel place an arm of a patient placing side on the arm constraint fixer. The upper arm of the arm to be inserted is fixed by the upper arm restraint band 6 after being placed on the upper arm fixing plate 5, and the forearm is fixed by the forearm restraint band 9 after being placed on the forearm fixing plate 8. After the arm at the implantation side is properly fixed, the position of the arm restraint fixer is adjusted according to the clinical operation requirement, so that the abduction angle of the arm at the implantation side is accurately adjusted (generally to about 90 degrees). After the abduction angle of the arm at the implantation side is adjusted to the right position, the medical staff can perform the operation of implanting the central venous catheter by sitting beside the body of the patient. Medical personnel can also adjust patient's arm according to the high condition when self operates a little (first unscrewing first bolt axle 10 and second bolt axle 11, adjust screwing up again after targetting in place), can let medical personnel put the pipe under comfortable operation position like this, be favorable to improving the operation success rate. In addition, because the rear end of the forearm support 7 is hinged with the front end of the upper arm support 4 through the belt locking hinge assembly, the angle between the upper arm and the forearm of the patient can be flexibly adjusted according to the requirement, so that the operation is convenient.

As shown in fig. 1 and 2, in this embodiment 1, the upper arm support 4 includes a first rear fixing plate 4.1, a first front fixing plate 4.2, and two first slide bars 4.3, the two first slide bars 4.3 are arranged in parallel, the first rear fixing plate 4.1 is fixedly installed at the rear ends of the two first slide bars 4.3, the first front fixing plate 4.2 is fixedly installed at the front ends of the two first slide bars 4.3, two first slide cylinders 5a are arranged at the bottom of the upper arm fixing plate 5, the two first slide cylinders 5a are respectively slidably installed on the two first slide bars 4.3, and a first locking hand wheel 4.4 for locking the first slide bars 4.3 is installed on each first slide cylinder 5 a; the front arm support 7 comprises a second rear fixing piece 7.1, a second front fixing piece 7.2 and two second slide bars 7.3, the two second slide bars 7.3 are arranged in parallel side by side, the second rear fixing piece 7.1 is fixedly installed at the rear ends of the two second slide bars 7.3, the second front fixing piece 7.2 is fixedly installed at the front ends of the two second slide bars 7.3, two second slide cylinders 8a are arranged at the bottom of the front arm fixing plate 8, the two second slide cylinders 8a are respectively installed on the two second slide bars 7.3 in a sliding manner, and a second locking hand wheel 7.4 used for tightly fixing the second slide bars 7.3 is installed on each second slide cylinder 8 a; the belt locking hinge assembly is mounted on a first front stator 4.2 and a second rear stator 7.1. So set up for the position of upper arm fixed plate 5 and forearm fixed plate 8 all can adjust in a flexible way as the condition, makes this arm fixing device can be suitable for more patients to use on the one hand, and on the other hand can conveniently adjust the position that the arm received the restraint, the clinical operation of being convenient for.

As shown in fig. 1 and 2, in this embodiment 1, the locking hinge assembly includes two first hinge links 12, two second hinge links 13, a hinge shaft 14, and a third locking handwheel 15, the two first hinge links 12 are fixedly mounted on the first front fixing plate 4.2, the two second hinge links 13 are fixedly mounted on the second front fixing plate 7.2, the two first hinge links 12 and the two second hinge links 13 are hinged by the hinge shaft 14, and the third locking handwheel 15 is mounted at an end of the hinge shaft 14. So set up, through loosening, tighten third locking hand wheel 15 and just can conveniently adjust the angle between patient's upper arm and the forearm.

As shown in fig. 1 and 2, in this embodiment 1, the arm restraint fixator further includes a hand fixing plate 16, a hand restraint strap 17, a double-cylinder sliding seat 18, a fourth locking handwheel 19 and a fifth locking handwheel 20, the double-cylinder sliding seat 18 is slidably mounted in front of the two second slide bars 7.3, the double-cylinder sliding seat 18 is mounted with the two fourth locking handwheels 19 for fastening the second slide bars 7.3, the upper surface of the double-cylinder sliding seat 18 is provided with a ball socket seat 18a, the lower surface of the hand fixing plate 16 is provided with a ball head 16a, the ball head 16a is mounted in the ball socket seat 18a, the bottom of the double-cylinder sliding seat 18 is mounted with the fifth locking handwheel 20 for fastening the ball head 16a at a position corresponding to the ball socket seat 18a, and the hand restraint strap 17 is mounted on the side edge of the hand fixing plate 16. With such an arrangement, the hand of the patient can be fixed by the hand fixing plate 16 and the hand restraining band 17, and the patient can adjust the wrist in a rotating manner, which is beneficial to reaching the optimal puncture position.

As shown in fig. 1 and 3, in this embodiment 1, one end of the console base 1 is provided with a mounting hole, and a leg connecting cylinder 21 is rotatably mounted in the mounting hole; the fixer operating mechanism comprises a driving motor 22, a driving gear 23, a fixed cylinder gear 24, a vertical guide rod 25 and a lifting driving part 26, wherein the driving motor 22 is installed beside the bed leg connecting cylinder 21, the driving gear 23 is installed at the output end of the driving motor 22, the fixed cylinder gear 24 is coaxially installed at the upper end of the bed leg connecting cylinder 21, and the fixed cylinder gear 24 is meshed with the driving gear 23; lift drive part 26 is installed to the other end of control rack 1, 2 fixed mounting of fixer mounting panel are in the upper end of lift drive part 26, vertical guide rod 25 slides and wears to locate in control rack 1, and vertical guide rod 25 upper end fixed connection is in 2 bottoms of fixer mounting panel. So set up, in operation, driving motor 22 starts to drive driving gear 23 rotatory, because driving gear 23 meshes with solid fixed cylinder gear 24, and solid fixed cylinder gear 24 and footpost connecting cylinder 21 keep motionless with footpost fixed connection, like this along with driving motor 22's operation, will drive the other end of control rack 1 and rotate from the bed bottom and shift out, thereby make lift drive part 26, fixer mounting panel 2 and arm restraint fixer shift out, after arm restraint fixer rotates and shifts out to suitable angle position, driving motor 22 stops, lift drive part 26 starts, drive fixer mounting panel 2 and arm restraint fixer rise to suitable height.

As shown in fig. 1, in the present embodiment 1, universal support wheels 27 are mounted on the bottom surface of the control console 1. So set up, universal supporting wheel 27 can let the installation control cabinet keep steady to make whole arm fixing device remain stable, and then be favorable to improving and put the pipe success rate.

As shown in fig. 1 and 3, in embodiment 1, the lifting driving member 26 is an electric push rod; in practical applications, the lifting driving member 26 may also be other conventional products in the prior art, such as a screw rod lifter or an air cylinder, as long as the lifting function is provided. In the embodiment 1, the power supply of the driving motor 22 is provided by the storage battery 28, and the storage battery 28 also supplies power to the electric push rod; in practical applications, the driving motor 22 may also use an external power source.

Example 2

As shown in fig. 4, embodiment 2 discloses a special bed for placing a central venous catheter through a peripheral vein, which comprises a catheter placing bed 29, wherein arm fixing devices of embodiment 1 are respectively installed on bed legs at two sides of the head end of the catheter placing bed 29, and a control rack 1 in the arm fixing devices is rotatably connected to the bed legs. When the arm fixing device is used specifically, the arm fixing device on the corresponding side can be moved out according to the clinical operation requirements, and the original position is restored after the operation is finished.

In addition, in this embodiment 2, the side of the tube placing bed 29 is preferably provided with a bed stop (not shown in the figure), which is beneficial to ensuring the safety of the patient.

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above specific embodiment. Various changes and modifications may be made within the scope of the present invention, and any modifications, variations or equivalents may be made by those skilled in the art based on the above description without departing from the scope of the present invention.

Claims

1. Put into central venous catheter's arm fixing device through periphery vein, its characterized in that: the device comprises an installation control platform and an arm restraint fixer, wherein the installation control platform comprises a control rack (1), a fixer operating mechanism and a fixer mounting plate (2), the control rack (1) is used for being installed on a tube placing bed (29), the fixer operating mechanism is installed in the control rack (1), the fixer mounting plate (2) is installed at the output end of the fixer operating mechanism, the arm restraint fixer is installed on the fixer mounting plate (2), and the fixer operating mechanism is used for driving the arm restraint fixer to move outwards from the bottom of the tube placing bed (29) to the side of the bed or reversely move to the bottom of the bed from the side of the bed; the arm restraint fixator comprises a U-shaped mounting frame (3), an upper arm support (4), an upper arm fixing plate (5), an upper arm restraint belt (6), a forearm support (7), a forearm fixing plate (8) and a forearm restraint belt (9), wherein the bottom of the U-shaped mounting frame (3) is fixedly mounted on the fixator mounting plate (2), the rear end of the upper arm support (4) is mounted at the upper end of a rear fork arm of the U-shaped mounting frame (3) through a first bolt shaft (10) capable of being adjusted in an elastic mode, the front end of the upper arm support (4) is mounted at the upper end of a front fork arm of the U-shaped mounting frame (3) through a second bolt shaft (11) capable of being adjusted in an elastic mode, and the upper arm support (4) can be adjusted in a rotating mode around the first bolt shaft (10) and the second bolt shaft (11); the upper arm fixing plate (5) is installed on the upper arm support (4), an upper arm restraint belt (6) is installed on the side edge of the upper arm fixing plate (5), the rear end of the forearm support (7) is hinged with the front end of the upper arm support (4) through a belt locking hinge assembly, and the forearm support (7) and the upper arm support (4) can be adjusted in a relative rotation mode; the forearm fixing plate (8) is arranged on the forearm bracket (7), and the side edge of the forearm fixing plate (8) is provided with a forearm restraint strap (9).

2. An arm fixation device for placement via a peripheral vein into a central venous catheter as in claim 1, wherein: the upper arm support (4) comprises a first rear fixing piece (4.1), a first front fixing piece (4.2) and two first slide bars (4.3), the two first slide bars (4.3) are arranged in parallel, the first rear fixing piece (4.1) is fixedly installed at the rear ends of the two first slide bars (4.3), the first front fixing piece (4.2) is fixedly installed at the front ends of the two first slide bars (4.3), two first slide cylinders (5a) are arranged at the bottom of the upper arm fixing plate (5), the two first slide cylinders (5a) are respectively installed on the two first slide bars (4.3) in a sliding mode, and a first locking hand wheel (4.4) used for locking the first slide bars (4.3) is installed on each first slide cylinder (5 a); the front arm support (7) comprises a second rear fixing piece (7.1), a second front fixing piece (7.2) and two second sliding rods (7.3), the two second sliding rods (7.3) are arranged in parallel side by side, the second rear fixing piece (7.1) is fixedly installed at the rear ends of the two second sliding rods (7.3), the second front fixing piece (7.2) is fixedly installed at the front ends of the two second sliding rods (7.3), two second sliding barrels (8a) are arranged at the bottom of the front arm fixing plate (8), the two second sliding barrels (8a) are respectively slidably installed on the two second sliding rods (7.3), and a second locking hand wheel (7.4) used for tightly fixing the second sliding rods (7.3) is installed on each second sliding barrel (8 a); the hinge assembly with lock is mounted on the first front fixing plate (4.2) and the second rear fixing plate (7.1).

3. The device of claim 2, wherein the arm securing device is configured to be placed into a central venous catheter via a peripheral vein, and further comprising: area locking hinge subassembly includes two first hinge connecting rods (12), two second hinge connecting rods (13), articulated shaft (14) and third locking hand wheel (15), and two first hinge connecting rods (12) fixed mounting are on first preceding stationary blade (4.2), and two second hinge connecting rods (13) fixed mounting are on stationary blade (7.2) before the second, through articulated shaft (14) hinge between two first hinge connecting rods (12) and two second hinge connecting rods (13), third locking hand wheel (15) are installed at articulated shaft (14) tip.

4. An arm fixation device for placement via a peripheral vein into a central venous catheter as in claim 2, wherein: the arm restraint fixer also comprises a hand fixing plate (16), a hand restraint belt (17), a double-cylinder sliding seat (18), a fourth locking hand wheel (19) and a fifth locking hand wheel (20), the double-cylinder sliding seats (18) are slidably arranged at the front parts of the two second sliding rods (7.3), two fourth locking hand wheels (19) used for tightly fixing the second sliding rods (7.3) are arranged on the double-cylinder sliding seats (18), ball socket seats (18a) are arranged on the upper surfaces of the double-cylinder sliding seats (18), the lower surface of the hand fixing plate (16) is provided with a ball head (16a), the ball head (16a) is arranged in a ball socket seat (18a), a fifth locking hand wheel (20) used for tightly fixing the ball head (16a) is arranged at the bottom of the double-cylinder sliding seat (18) corresponding to the ball socket seat (18a), a hand restraint strap (17) is arranged on the side edge of the hand fixing plate (16).

5. An arm fixation device for placement via a peripheral vein into a central venous catheter as in claim 1, wherein: one end of the control rack (1) is provided with a mounting hole position, and a bed leg connecting cylinder (21) is rotatably mounted in the mounting hole position; the fixer operating mechanism comprises a driving motor (22), a driving gear (23), a fixed cylinder gear (24), a vertical guide rod (25) and a lifting driving part (26), the driving motor (22) is installed beside the bed leg connecting cylinder (21), the driving gear (23) is installed at the output end of the driving motor (22), the fixed cylinder gear (24) is coaxially installed at the upper end of the bed leg connecting cylinder (21), and the fixed cylinder gear (24) is meshed with the driving gear (23); lifting drive part (26) is installed to the other end of control cabinet frame (1), fixer mounting panel (2) fixed mounting be in the upper end of lifting drive part (26), vertical guide arm (25) slide and wear to locate in control cabinet frame (1), vertical guide arm (25) upper end fixed connection is in fixer mounting panel (2) bottom.

6. An arm brace for placement via a peripheral vein into a central venous catheter according to claim 5, wherein: the bottom surface of the control rack (1) is provided with universal supporting wheels (27).

7. An arm securing device for peripherally inserted central catheter according to claim 5, wherein: the lifting driving part (26) adopts an electric push rod, a screw rod lifter or an air cylinder.

8. The special bed for placing the central venous catheter through the peripheral vein comprises a catheter placing bed (29), and is characterized in that: the arm fixing device according to any one of claims 1 to 7 is mounted on each of the legs on both sides of the head end of the tube placing bed (29), and the control rack (1) in the arm fixing device is rotatably connected to the legs.