CN114469637A

CN114469637A - Traction-compression bidirectional device for promoting healing after tibial fracture operation

Info

Publication number: CN114469637A
Application number: CN202210093775.2A
Authority: CN
Inventors: 陈伟; 张奇; 吕红芝; 孔德志; 李泳龙; 赵阔; 张英泽
Original assignee: Third Hospital of Hebei Medical University
Current assignee: Third Hospital of Hebei Medical University
Priority date: 2022-01-26
Filing date: 2022-01-26
Publication date: 2022-05-13

Abstract

The invention discloses a traction-compression bidirectional device for promoting healing after a tibial fracture operation, which comprises a fixing boot, a U-shaped frame and a driving mechanism. A bootie to be worn on a patient's foot, the bootie having an inflatable bladder layer therein; the U-shaped frame comprises two first arms and a second arm for connecting the two first arms, the free ends of the two first arms are fixed with the fixed boot, and the second arm is positioned at the far end of the fixed boot; and a driving mechanism acts on the second arm of the U-shaped frame and is used for driving the U-shaped frame to compress the fixing shoe towards the proximal end or pull the fixing shoe towards the distal end. The device applies compression or traction to the distal tibia of a patient, realizes bidirectional stress stimulation, induces micromotion between fractures, and improves the speed and quality of fracture healing.

Description

Traction-compression bidirectional device for promoting healing after tibial fracture operation

Technical Field

The invention relates to the technical field of orthopedic medical instruments, in particular to a traction-compression bidirectional device for promoting healing after a tibial fracture operation.

Background

Long bone fractures are common orthopedic trauma diseases, and two important links in the treatment method are traction reduction and fixation. Among them, the fracture is not healed more than normal healing time after treatment and the healing process is terminated, i.e. the bone is not connected, and X-ray tablets usually show that fracture lines exist continuously, the broken ends are hardened, callus is atrophied or lacked, etc. Except that only a small fraction of proliferative nonunions of long bones, which are completely caused by stress instability, need to be restituted, almost all treatments for nonunions of long bones require bone grafting.

The factors causing the bone nonunion include two categories of systemic and local factors, in comparison, particularly the local factor of the long bone nonunion after the operation treatment of the fracture is the main reason, and the factors closely related to the treatment of the long bone nonunion after the operation treatment are as follows:

(1) neglect to protect the blood transport at the broken ends: the basis for ensuring fracture healing is to protect the blood circulation of tissues to the maximum extent and to interfere with the internal environment of healing as little as possible. The damage of local blood circulation damage of long bone fracture (displacement), rough operation in the operation process and extensive periosteum and soft tissue stripping during over-emphasis of anatomical reduction is further aggravated;

(2) the internal fixing mode is selected and applied inappropriately with the internal fixing object;

(3) improper functional exercises: the prerequisite for proper early functional exercise (weight bearing) is the fixation strength of the fractured ends of the fracture, internal fixation failure due to over exercise (movement) and final bone nonunion, especially after discharge.

In conclusion, part of the factors for treating the nonunion after the long bone fracture through the operation are iatrogenic, and the nonunion can be effectively prevented through standardized diagnosis and treatment, so that the time for patients to suffer from disability is shortened, and the functions of limbs are recovered; another reason is due to the patient's own cause.

Improper movement of a patient with long bone fracture can lead to bone healing difficulty, but deep vein thrombosis can be easily caused if the patient does not move, particularly for a patient with lower limb fracture, the time of bed-lying after fracture is long, the blood flow is slow during bed-lying, and coagulation factors of blood are easily caused to be difficult to coagulate on the blood vessel wall, so that thrombosis of lower limb veins is formed. Particularly, it is seen in the posterior tibial vein of the lower leg, the popliteal vein and the femoral vein, and the iliac vein is often involved in embolism.

Therefore, it is an urgent need to solve the problem of the prior art to provide a device suitable for the long bone fracture patients to use after surgery, provide a suitable stress stimulation for the patients, make the local tissues exhibit the properties of hyperplasia, regeneration and rapid evolution and reconstruction, and accelerate fracture healing.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a traction-compression bidirectional device which can provide proper stress stimulation for a patient and is used for promoting the healing of the tibia fracture after operation.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

a distractor-compression bi-directional device for promoting post-operative healing of a tibial fracture, comprising:

a fixing boot to be worn on a foot of a patient, the fixing boot having an inflatable air bag layer inside;

the U-shaped frame comprises two first arms and a second arm for connecting the two first arms, the free ends of the two first arms are fixed with the fixed boot, and the second arm is positioned at the far end of the fixed boot; and

and a driving mechanism acting on the second arm of the U-shaped frame for driving the same to compress the fixing shoe towards the proximal end or pull the fixing shoe towards the distal end.

A further technical solution is that the drive mechanism comprises:

the traction box is fixed in the middle of the second arm, a slide way arranged along the length direction of the tibia is arranged in the traction box, two ends of the slide way are sealed,

the hammer body is slidably arranged on the traction box and can slide through the traction box; and

and the driving part is used for driving two ends of the hammer body hammering slideway.

A further aspect is that the driving unit includes:

the first electromagnet is fixed on the hammer body and connected in a circuit capable of switching the positive electrode and the negative electrode; and

the two first permanent magnets are respectively fixed at the two ends of the traction box; the first electromagnet generates repulsion and attraction with the two first permanent magnets respectively after being electrified.

A further aspect is that the driving unit includes:

the first fixing box is arranged around the second arm of the U-shaped frame and is provided with a hole for the first arm to slidably extend out;

the first screw is rotatably fixed in the first fixing box and arranged along the direction of the slideway, and one end of the first screw is connected with a first motor for driving the first screw to rotate; and

one end of the connecting rod is fixed with the hammer body, the other end of the connecting rod extends out of the traction box and is in threaded connection with the first screw rod, and a through hole for the connecting rod to pass through and is parallel to the first screw rod is formed in the side wall of the traction box.

A further technical solution is that the drive mechanism comprises:

the second fixing box is arranged around the second arm of the U-shaped frame and is provided with a hole for the first arm to slidably extend out; and

the second electromagnet and the second permanent magnet are oppositely arranged and are respectively fixed with the second arm and the second fixing box, and the second electromagnet is connected in a circuit capable of switching positive and negative poles.

A further technical solution is that the drive mechanism comprises:

the third fixing box is arranged around the second arm of the U-shaped frame and is provided with a hole for the first arm to slidably extend out;

the second screw rod is rotatably fixed in the third fixing box and arranged along the length direction of the tibia, and one end of the second screw rod is connected with a second motor for driving the second screw rod to rotate; and

and the lower ends of the pressure rods are in threaded connection with the second screw rod and are in sliding contact fit with the inner wall of the third fixing box so as to limit the rotation of the pressure rods.

A further technical scheme lies in, the device still includes the fixing base, the fixing base includes:

the upper surface of the base is a downward concave cambered surface;

the upper cover is buckled at the upper part of the base and can be locked or unlocked with the base, and a cavity for accommodating the limbs of the patient can be enclosed between the upper cover and the base after the upper cover is closed;

the air bag cushion is positioned on the upper surface of the base and is connected with an air inflation and deflation assembly; and

the magnetic therapy component is fixed on the lower surface of the upper cover and is provided with a plurality of magnetic therapy massage heads.

A further technical scheme is that the airbag cushion and the base are fixedly adhered through a magic tape.

The technical scheme is that the base is hollow, one or more storage cavities are formed in the base, and the storage cavities are correspondingly provided with door openings.

The technical scheme is that the bottom surface of the fixing seat is a plane, supporting legs are arranged at four corners of a rectangle on the bottom surface, and the supporting legs are of multi-section telescopic structures and can be completely accommodated in the fixing seat.

Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:

the device is worn on patient's foot through setting up fixed boots, realizes being connected fixedly with the device and patient. The inner layer of the fixing boot is provided with the inflatable lining to adapt to patients with different postures for use, so that the fixing boot can tightly cover the foot of the patient, and the fixing boot is prevented from falling off during traction.

When the driving mechanism acts on the second arm of the U-shaped frame and drives the second arm to compress the fixing shoe towards the near end, the fixing shoe applies a compression force to the tibia, and the force acts on the foot of a human body through the air cushion, so that the use comfort of a patient is improved. The compression force can be continuous or has a certain interval frequency, when the compression force is compressed at intervals, the compression stress acts on the axial direction of the shin, the micromotion between fractures can be induced, blood is activated, muscles and bone ends are massaged, the internal and external adhesion of joints is reduced, the growth of callus at the fracture part and the formation of new bones are promoted, the speed and the quality of fracture healing are improved, and the bone formation is enhanced.

When the driving mechanism acts on the second arm of the U-shaped frame to drive the second arm to pull the fixing shoe towards the far end, the fixing shoe applies pressure and pulling force to the tibia, and based on the Ilizarov theory, under the stimulation of continuous, slow and stable pulling stress, the fracture tissue has the properties of hyperplasia, regeneration and rapid evolution and reconstruction, so that the healing of the fracture end face is accelerated.

In addition, no matter compression or traction, air in the air bag layer on the fixing boot flows, part of the air bag is compressed, and part of the air bag is expanded, so that the air bag layer has the effect of massaging the foot of the patient, blood is activated, and thrombus is avoided.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a view of the present tension-compression bi-directional device in use;

FIG. 2 is a schematic view showing the construction of a driving mechanism in embodiment 1 of the present tension-compression bidirectional apparatus;

FIG. 3 is a schematic view showing the construction of a driving mechanism in embodiment 2 of the present tension-compression bidirectional apparatus;

FIG. 4 is a schematic view showing the construction of the driving mechanism in embodiment 3 of the present tension-compression bidirectional apparatus;

FIG. 5 is a schematic view showing the construction of the driving mechanism in embodiment 4 of the present tension-compression bidirectional apparatus;

FIG. 6 is a schematic view of the structure of the fixing base in the present bi-directional device.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

As shown in FIG. 1, a distraction-compression bi-directional device for promoting post-operative healing of a tibial fracture includes a fixation shoe 10, a U-shaped frame 20 and a drive mechanism for applying compressive and distraction forces to the distal end of the femur to provide a bi-directional stress environment. And the two modes of the device, namely the pulling towards the far end and the compressing towards the near end, can be carried out at intervals, and can also be used for selecting a single mode to carry out treatment.

The device is worn on the foot of a patient through the arrangement of the fixing boots 10, the fixing boots 10 are similar to existing boots or shoes and are worn on the foot of the patient, and the fixing boots 10 are provided with the zippers or the binding bands, so that the patient can conveniently wear and take off the device, and the device and the patient can be connected and fixed. The fixing boot 10 is provided with an inflatable air bag layer inside, and the inner layer of the fixing boot 10 is provided with an inflatable lining to adapt to patients with different body states, so that the fixing boot 10 can tightly cover the feet of the patients, and the fixing boot 10 is prevented from falling off during traction.

The U-shaped frame 20 comprises two first arms, the free ends of which are fixed to the boot 10, and a second arm connecting the two first arms, which is located at the distal end of the boot 10.

The driving mechanism acts on the second arm of the U-shaped frame 20 for driving it to compress the fixing shoe 10 proximally or to pull the fixing shoe 10 distally.

When the driving mechanism acts on the second arm of the U-shaped frame 20 to drive it to compress the fixing shoe 10 proximally, the fixing shoe 10 applies a compressive force to the tibia, and the force acts on the foot of the human body through the air cushion, thereby improving the comfort of the patient. The compression force can be continuous or has a certain interval frequency, when the compression force is compressed at intervals, the compression stress acts on the axial direction of the shin, the micromotion between fractures can be induced, blood is activated, muscles and bone ends are massaged, the internal and external adhesion of joints is reduced, the growth of callus at the fracture part and the formation of new bones are promoted, the speed and the quality of fracture healing are improved, and the bone formation is enhanced.

When the driving mechanism acts on the second arm of the U-shaped frame 20 to drive the U-shaped frame to pull the fixing shoe 10 towards the far end, the fixing shoe 10 applies pressure and pulling force to the tibia, and based on the Ilizarov theory, under the stimulation of continuous, slow and stable pulling stress, the fracture tissue presents the properties of hyperplasia, regeneration and rapid evolution and reconstruction, so that the healing of the fracture end face is accelerated.

In addition, no matter compression or traction, the air in the air bag layer on the fixing boot 10 flows, part of the air bag is compressed, and part of the air bag is expanded, so that the air bag layer has the function of massaging the foot of the patient, the blood is activated, and the occurrence of thrombus is avoided.

As to the specific driving form of the driving mechanism, several specific embodiments as follows can be adopted.

Example 1

As shown in fig. 2, in the present embodiment, the driving mechanism includes a pulling case 301, a hammer body 302, and a driving portion. The traction box 301 is fixed in the middle of the second arm, a slide way arranged along the length direction of the tibia is arranged inside the traction box 301, and two ends of the slide way are closed. The hammer body 302 is slidably disposed in a slide way of the traction box 301, and the driving portion is used for driving two ends of the hammer slide way opposite to the hammer body 302. The hammer body 302 respectively hammers two ends of the slideway to apply hammering force towards the far end and the near end to the U-shaped frame 20, so as to apply compression force or traction force to the tibia.

Specifically, the driving portion may be implemented by using electromagnetism, and includes a first electromagnet 311 and two first permanent magnets 312. The first electromagnet 311 is fixed on the hammer 302 and connected to a positive-negative switching circuit, which is the prior art and will not be described herein. The two first permanent magnets 312 are respectively fixed at two ends of the traction box 301; the first electromagnet 311 and the first electromagnet 311 are electrified to respectively generate repulsion and attraction with the two first permanent magnets 312. After the circuit is powered on, under the action of the attraction force and the repulsion force of the magnetic field, the hammer body 302 instantaneously moves towards one end of the slide way, and one end of the slide way is hammered to provide instantaneous compression or traction force. The alternate implementation of compression and tension can be realized by the interval switching of the electrodes in the circuit.

Example 2

As shown in fig. 3, in the present embodiment, the driving mechanism includes a pulling case 301, a hammer body 302, and a driving portion. The traction box 301 is fixed in the middle of the second arm, a slide way arranged along the length direction of the tibia is arranged inside the traction box 301, and two ends of the slide way are closed. The hammer body 302 is slidably disposed in a slide way of the traction box 301, and the driving portion is used for driving two ends of the hammer slide way opposite to the hammer body 302. The hammer body 302 respectively hammers two ends of the slideway to apply hammering force towards the far end and the near end to the U-shaped frame 20, so as to apply compression force or traction force to the tibia.

Specifically, the driving part may be implemented using a mechanical drive, which includes a first fixing box 321, a first screw 322, and two rods.

The first fixing box 321 provides a fixed reference position for the driving portion, the first fixing box 321 is arranged around the second arm of the U-shaped frame 20, a hole for the first arm to slidably extend out is formed in the first fixing box 321, the U-shaped frame 20 can slide in or slide out of the first fixing box 321, the position of the first fixing box 321 is guaranteed not to move when the first fixing box 321 is driven, and a sucking disc is arranged on a contact part of the first fixing box 321 and the bottom surface or the bed surface, so that the stability of the first fixing box 321 is improved. The first screw rod 322 is rotatably fixed in the first fixing box 321 through a bearing seat and is arranged along the direction of the slideway, and one end of the first screw rod 322 is connected with a first motor 323 for driving the first screw rod to rotate. One end of the connecting rod is fixed with the hammer body 302, the other end of the connecting rod extends out of the traction box 301 and is in threaded connection with the first screw rod 322, and a through hole for the connecting rod to pass through and is parallel to the first screw rod 322 is formed in the side wall of the traction box 301. The hammer body 302 can hammer the two ends of the traction box 301 by driving the first screw rod 322 to rotate forwards or backwards through the first motor 323, so that the U-shaped frame 20 draws the fixing shoe 10 to generate a compression force or a traction force, and the traction box 301 can be reset through resetting of an air bag layer in the fixing shoe 10.

Example 3

As shown in fig. 4, in this embodiment, the driving mechanism includes a second fixed box 331, a second electromagnet 332 and a second permanent magnet 333, the second fixed box 331 is also disposed around the second arm of the U-shaped frame 20, the second fixed box 331 has a hole for the first arm to slidably extend, so that the U-shaped frame 20 can slide in or slide out of the second fixed box 331, in order to maintain the placement stability of the second fixed box 331 and ensure that the second fixed box 331 does not move when driven, a suction cup is disposed at a portion of the second fixed box 331 contacting the bottom surface or the bed surface, so as to increase the stability of the second fixed box 331. And a second electromagnet 332 and a second permanent magnet 333 which are oppositely arranged and fixed with the second arm and the second fixing box 331 respectively, wherein the second electromagnet 332 is connected in a positive-negative switching circuit. Through the interval switching of the electrodes in the circuit, a repulsive force or an attractive force is generated between the second electromagnet 332 and the second permanent magnet 333, so that the U-shaped frame 20 pulls the fixing shoe 10 to generate a compression force or a pulling force.

Example 4

As shown in fig. 5, in this embodiment, the driving mechanism includes a third fixed box 341, a second screw 342 and two pressing rods 344, the third fixed box 341 is disposed around the second arm of the U-shaped frame 20, the third fixed box 341 has a hole for the first arm to slidably protrude, so that the U-shaped frame 20 can slide into or out of the third fixed box 341, and in order to maintain the stability of the third fixed box 341 and ensure that the third fixed box 341 does not move when being driven, a suction cup is disposed on a portion of the third fixed box 341 that contacts with the bottom surface or bed surface, so as to increase the stability of the third fixed box 341. The second screw 342 is rotatably fixed in the third fixing box 341 through a bearing seat and is arranged along the length direction of the tibia, and one end of the second screw 342 is connected with a second motor 343 for driving the second screw to rotate. The two pressing rods 344 are respectively vertically positioned at two sides of the second arm, and the lower ends of the pressing rods 344 are in threaded connection with the second screw 342 and are in sliding contact fit with the inner wall of the third fixed box 341 through a concave-convex structure so as to limit the rotation of the pressing rods 344.

The second screw 342 is driven by the second motor 343 to rotate forward or backward, so that one of the pressing rods 344 presses the U-shaped rod to displace the U-shaped rod, and the fixing shoe 10 is pulled to generate a compression force or a pulling force.

As shown in fig. 6, the device further comprises a fixed seat comprising a base 41, an upper cover 42, an airbag cushion 43 and a magnetotherapeutic assembly 44.

The upper surface of the base 41 is a downwardly concave arc surface, which is fitted to the radian of a human body. The upper cover 42 is fastened on the upper portion of the base 41, one end of the upper cover in the radial direction is rotatably fixed with the base 41 through hinges and the like, the other end of the upper cover in the radial direction is provided with a lock catch fixed with the base 41 and capable of being locked with or unlocked from the base 41, and a cavity for accommodating the limbs of the patient can be formed between the closed upper cover 42 and the base 41.

An airbag cushion 43 and a magnet therapy assembly 44 are located within the cavity. The airbag cushion 43 is located on the upper surface of the base 41 and is connected to an inflation and deflation assembly. The air bag cushion 43 is fixedly bonded with the base 41 through the magic tape, and the sub-tape and the mother tape of the magic tape are respectively fixed with the air bag cushion 43 and the base 41, so that the air bag cushion 43 is convenient to disassemble, assemble, clean and sterilize. And fixed by the magic tape bonding mode, the relative position of the airbag cushion 43 and the base 41 can be adjusted, and the use requirements of different patients can be met. The air bag cushion 43 is repeatedly inflated and deflated to achieve the effect of massaging the affected limb and promote the blood circulation.

The magnetic therapy component 44 belongs to the prior art, and is not described herein in detail, the magnetic therapy component 44 is fixed on the lower surface of the upper cover 42 and is provided with a plurality of magnetic therapy massage heads, and the magnetic field can adjust the internal biological magnetic field, generate induction micro-current, change the permeability of cell membranes, change the activity of certain enzymes, expand blood vessels and accelerate blood flow, thereby achieving the auxiliary treatment effects such as pain relieving, swelling reducing and the like. Meanwhile, the magnetic therapy massage head is simultaneously provided with a mechanical massage device, and scientific research shows that slight shock type vibration perpendicular to marrow cavities of bones is applied to two sides of the fractured end to promote the fractured end to heal. A magnetic therapy massage head with magnetic therapy and mechanical massage belongs to the prior art and is not described herein.

In addition, the base 41 has a hollow structure, and one or more storage cavities corresponding to the door are formed therein. The fixing seat in the device can also play a role of storage, and the fixing boot 10, the power line, the air bag cushion 43 and the like are stored.

The bottom surface of fixing base is the plane, has supporting leg 45 in the four corners of bottom surface rectangle, supporting leg 45103 is multisection extending structure to can accomodate in the fixing base completely. The multi-section telescopic structure belongs to the prior art, and is not described herein. When the patient uses the support leg 45, the height of the support leg can be adjusted to be proper. Alternatively, the support legs 45 are completely accommodated in the holder and supported by the bottom surface of the holder. The bottom of supporting leg 45 also can be fixed with the sucking disc, guarantees the stability that the fixing base was placed.

The above is only a preferred embodiment of the invention, and any simple modifications, variations and equivalents of the invention may be made by anyone in light of the above teachings and fall within the scope of the invention.

Claims

1. A distractor-compression bi-directional device for promoting post-operative healing of a tibial fracture, comprising:

a fixing boot (10) to be worn on a foot of a patient, the fixing boot (10) having an inflatable air bag layer inside;

a U-shaped frame (20) comprising two first arms and a second arm connecting the two first arms, the free ends of the two first arms being fixed to the fixed shoe (10), the second arm being located at the distal end of the fixed shoe (10); and

and the driving mechanism acts on the second arm of the U-shaped frame (20) and is used for driving the U-shaped frame to compress the fixing shoe (10) towards the proximal end or pull the fixing shoe (10) towards the distal end.

2. The device of claim 1, wherein the drive mechanism comprises:

a traction box (301) fixed in the middle of the second arm, a slide way arranged along the length direction of the tibia is arranged in the traction box (301), two ends of the slide way are sealed,

a hammer body (302) which is slidably arranged on the traction box (301) and can slide through; and

and the driving part is used for driving the hammer body (302) to hammer two ends of the slideway.

3. The apparatus according to claim 2, wherein the driving part comprises:

the first electromagnet (311) is fixed on the hammer body (302) and is connected in a circuit capable of switching the positive electrode and the negative electrode; and

two first permanent magnets (312) respectively fixed at two ends of the traction box (301); the first electromagnet (311) and the two first permanent magnets (312) respectively generate repulsion force and attraction force after the first electromagnet (311) is electrified.

4. The apparatus according to claim 2, wherein the driving part comprises:

a first fixed box (321) arranged around the second arm of the U-shaped frame (20), wherein the first fixed box (321) is provided with a hole for the first arm to slidably extend out;

the first screw rod (322) is rotatably fixed in the first fixing box (321) and arranged along the direction of the slide way, and one end of the first screw rod (322) is connected with a first motor (323) for driving the first screw rod to rotate; and

one end of the connecting rod is fixed with the hammer body (302), the other end of the connecting rod extends out of the traction box (301) and is in threaded connection with the first screw rod (322), and a through hole for the connecting rod to pass through and is parallel to the first screw rod (322) is formed in the side wall of the traction box (301).

5. The device of claim 1, wherein the drive mechanism comprises:

a second stationary box (331) disposed around the second arm of the U-shaped frame (20), the second stationary box (331) having a hole therein through which the first arm slidably extends; and

the second electromagnet (332) and the second permanent magnet (333) are oppositely arranged and are respectively fixed with the second arm and the second fixing box (331), and the second electromagnet (332) is connected in a circuit capable of switching positive and negative poles.

6. The device of claim 1, wherein the drive mechanism comprises:

a third fixed box (341) arranged around the second arm of the U-shaped frame (20), said third fixed box (341) having a hole for the first arm to slidably protrude;

the second screw rod (342) is rotatably fixed in the third fixed box (341) and is arranged along the length direction of the tibia, and one end of the second screw rod (342) is connected with a second motor (343) for driving the second screw rod to rotate; and

and the two pressure rods (344) are respectively vertically positioned at two sides of the second arm, and the lower ends of the pressure rods (344) are in threaded connection with the second screw (342) and are in sliding contact fit with the inner wall of the third fixed box (341) to limit the rotation of the pressure rods (344).

7. The device of claim 1, further comprising a holder, the holder comprising:

a base (41) having an upper surface in a downwardly concave arc;

the upper cover (42) is buckled at the upper part of the base (41) and can be locked or opened with the base (41), and a cavity for accommodating the limbs of the patient can be enclosed between the upper cover (42) and the base (41) after the upper cover (42) is closed;

the airbag cushion (43) is positioned on the upper surface of the base (41) and is connected with an inflation and deflation assembly; and

a magnetic therapy component (44) which is fixed on the lower surface of the upper cover (42) and is provided with a plurality of magnetic therapy massage heads.

8. The device as claimed in claim 7, wherein the airbag cushion (43) is fixed to the base (41) by hook and loop fastener.

9. The device according to claim 7, characterized in that the base (41) is hollow and forms one or more storage cavities corresponding to the door.

10. The device as claimed in claim 7, wherein the bottom surface of the fixing base is a plane, and the four corners of the rectangle of the bottom surface are provided with supporting legs (45), and the supporting legs (45) are in a multi-section telescopic structure and can be completely accommodated in the fixing base.