CN103876812B

CN103876812B - The Combined type external fixed support and pressure-adjustable fixed arm of adjustable pressure

Info

Publication number: CN103876812B
Application number: CN201410064412.1A
Authority: CN
Inventors: 宋若怡; 王秋霞; 宋文超
Original assignee: Individual
Current assignee: Henan Keke Biotechnology Co ltd
Priority date: 2014-02-20
Filing date: 2014-02-20
Publication date: 2019-02-12
Anticipated expiration: 2034-02-20
Also published as: CN103876812A

Abstract

The Combined type external fixed support of the adjustable pressure of orthopedics clinic practice, the present invention is divided into 3 kinds of single arm type, half-ring, ring type combining forms, fixing clip is divided into large knitting needle fixture block and stick fixture block, and pressure regulation fixed arm composition is made of adjustment axis, look nut, slide fit swivel nut, elastic device, fastening nut, fixed link etc..Adjustment axis is arranged radially catch spring pin, fixed lasso, scale casing, sliding sleeve；Slide fit swivel nut is arranged radially position-limitting pin, limit jackscrew, fastening jackscrew；Elastic device is made of spring, pressure sensor, connecting tube, pressure display unit, can be set as band manometer type or without manometer type.The Combined type external fixed support of adjustable pressure can axially conduct stress, so that fracture end is generated stress, avoid stress shielding, prevent the generation of fracture delayed healing and disunion.

Description

Pressure-adjustable combined type outer fixing support and pressure-adjustable fixing arm

Technical Field

The invention relates to a device for orthopedic clinical application, in particular to a pressure-adjustable fixing arm and a pressure-adjustable combined type outer fixing support comprising the same.

Background

The fracture healing process is complex, students at home and abroad continuously perfect the theory of fracture healing, the view of fracture firm fixation advocated in the early stage is proved by decades of clinical practice and experimental research, due to the stress shielding effect of a fixture, the fixed skeleton is easy to have osteoporosis, the fracture is delayed to heal, the bone is not connected, the fixture is broken after the fixture is removed, the proposed reasonable coaptation view of the organism is gradually accepted, the fracture healing is influenced by factors such as the age of a patient, the mechanical environment, the local blood circulation, the endocrine and the like, the stress is one of the main factors, an external fixing bracket is sometimes used for treating the fracture in the orthopedics department, various existing external fixing brackets have different shapes and structures, but cannot be subjected to micro-adjustment, a pressure adjusting device is not needed, stress shielding is easy to generate, the osteoporosis occurs and the fracture is delayed to heal when the external fixing bracket is applied, the fracture is easy to be re-fractured after the external fixture is removed, and the callus is slowly generated, the generation amount is small and the fracture healing speed is slow because no pressure stimulation exists at the fracture end. Scholars at home and abroad are dedicated to the research on fracture healing by micromotion and stress, and certain progress is achieved:

stress and fracture healing aspects: the bone tissue is a viscoelastic solid material, has complex mechanical properties, and the structure and the function of the bone tissue are closely related to the mechanical characteristics and the mechanical environment state of the bone tissue, so that different stress stimuli are determined to have different influences on bone metabolism and bone healing. In terms of the mechanism of stress action: stress-influenced fracture healing processThe cell signal transduction pathway can transmit extracellular matrix signals into cells through calcium ion channels, integrins, growth factors, etc., which are expressed or present across the cell membrane. Mechanical signal coupling, cell proliferation and intracellular and intercellular Ca of osteoblasts²⁺The level is related to the rise and fall of the integrin, which is a main substance linking signals inside and outside cells, can induce physiological and biochemical changes in osteoblasts under the stimulation of external tensile stress, make response and conduct signals, activate gene expression, synthesize and release cytokines and hormones, and regulate and control the induction of mechanical stimulation and the induction, proliferation, differentiation and mineralization of the mechanical stimulation. Integrin expression levels are characterized by time-limited changes. The secretion of growth factors caused by stress to osteoblast metabolism and cytokine regulation stress can be achieved by directly promoting the growth of cells or by promoting the secretion of hormones having growth effects in vivo, and the transforming growth factors are growth factors with high content in osteoblasts and can regulate the proliferation and differentiation of osteoblasts, and on the other hand, promote the synthesis of collagen type I, fibronectin, osteocontin and proteoglycan by osteoblasts.

The current research on the mode, the time, the type, the size and the like of the stress action is considered as follows: the activity of osteoblasts can be more excited by intermittent stress stimulation than by continuous stress stimulation; research considers that the early bone healing period is the most effective period for promoting bone healing by mechanical factors, when fracture healing recovers an original structure and hardness, the mechanical factors are the only factors for bone remodeling, proper stress and strain between fracture broken ends are ensured in the early bone healing period, compressive stress generated by axial load can drive osteoblasts and fibroblasts to develop towards the direction of differentiating into bones, the bone healing is facilitated, shear stress and torsional load generate shear stress, dynamic friction of fracture ends is preferably caused, capillary vessels and callus formed are greatly damaged, the fibroblast proliferation is driven, fibrous tissues are generated, the bone healing is not facilitated, and various stresses in the middle and later bone healing periods have certain promotion effects on the formation and reconstruction of the callus; the bone healing needs proper biomechanical environment or optimal stress level, the proper stress stimulation of the fracture end can promote the proliferation and differentiation of osteoblasts, chondroblasts and fibroblasts which play a role in the fracture healing, the stress required by the fracture end is different in different healing stages, the tissue rigidity of the healing area is low in the early healing stage, the capacity for bearing external force is poor, the required stress level is low, the required stress level is increased along with the rigidity of the healing tissue, the tissue can be well differentiated and healed only when the stress level of the fracture end and the tissue rigidity of the healing area are balanced and coordinated with each other, the stress is too large and exceeds the tissue bearing capacity, the living bone can be subjected to reactive surface absorption at a bone-bone interface or a bone-internal fixture interface, the pressure of the fracture end is reduced, the bone atrophy is caused, the pressure of the fracture end is more rapid, and on the contrary, the elastic deformation is not caused enough, the mechanical induction of tissue differentiation is reduced, the generation is difficult, and delayed healing and bone nonunion of bones can be caused. Generally, it is preferable that the fracture end compressive stress does not exceed the physiological body weight.

Micromotion and fracture healing: the micromotion of the fracture end is closely related to stress, and according to Wollf's law and many recent researches, the suitable micromotion of the controllability of the fracture end can promote the formation and calcification of callus and accelerate the healing of fracture, and the research at present on the aspects of the frequency, the time, the amount and the like of the micromotion is considered as follows: the low-frequency micromotion in the axial direction is beneficial to fracture healing, the early-stage controlled micromotion can promote fracture healing, and the micromotion generated in the late stage (4-6 weeks) is easy to damage the vascular network of the fracture part, so that the fracture healing is delayed.

The problems which are not solved by the current research are as follows: the optimal force value and the optimal mechanical parameters of the stress stimulation required by the fracture end of the human body fracture in different healing periods are not established. When appropriate mechanical stimulation is given to the fractured ends of the human body in the fracture healing process, the optimal time parameter of the fracture healing of the human body is not established. The orthopedics department fixing apparatus widely used in clinic such as interlocking intramedullary nail, steel plate, external fixation frame, etc. belongs to the category of strong internal fixation; there is a stress shield; clinical practice has not been able to predict or select the optimal mechanical and temporal parameters for a certain fracture. The application of a fracture fixing device which can control the stress and micromotion of the fracture end is not available.

The inventor applies for an invention patent in 2007, which is named as: an external fixing frame elastic device has the following patent numbers: ZL200710184889.3, and the grant notice number is CN101416900B, and the external fixing frame elastic device comprises a cylinder barrel, a sliding shaft inside the cylinder barrel, an elastic device, a sliding nail body and a sliding shaft limiting device. The cylinder barrel wall is radially provided with an anti-rotation rivet, a pressure regulating nut, a fastening jackscrew, a barrel wall hollow screw and a pressurizing hole. The sliding shaft limiting device can be provided with a limiting nut or a limiting clamping block on the sliding shaft, and the limiting nut or the limiting clamping block can be arranged on the wall of the cylinder barrel in the radial direction. The cylinder wall can be made into the same inner diameter of the upper part and the lower part, and the inner diameter of the upper part matched with the sliding shaft is larger than that of the lower part. The elastic device can be made into an elastic capsule type or a spring type. However, the external fixing frame elastic device still has the following defects: the pressure transmission device of the elastic rubber bag or the spring of the elastic device is difficult to assemble in the cylinder barrel, cannot be assembled by each part, and is difficult to popularize for mass production and assembly; the sliding nail body can be pressurized and adjusted only by matching a special pressurizing device with a pressurizing hole arranged on the side of the sliding nail body and a pressurizing hole arranged on a cylinder barrel, the operation is complex and time-consuming, accurate pressurization cannot be realized, the looseness of a fixed rod is easily caused during pressurization after an operation, and the gap of a fracture end cannot be accurately adjusted in time; the sliding shaft limiting device limits the position by arranging a limiting nut or a limiting clamping block on the sliding shaft, increases the length of an external fixing frame elastic device, and influences the selection of a needle inserting point of a bone screw or a bone needle, thereby influencing the fixing strength of the fracture.

Disclosure of Invention

The invention aims to make up the defects of the existing external fixing bracket for treating fracture, and provides a combined external fixing bracket and a pressure-adjustable fixing arm which have the advantages of firm fixation, simple operation and easy adjustment, can adjust pressure, effectively prevent stress shielding, avoid osteoporosis, stimulate callus generation at the fracture end and accelerate fracture healing.

The invention adopts the following technical scheme:

a pressable fixation arm for orthopedic clinical use, said pressable fixation arm comprising: the device comprises an adjusting shaft (1), a pressure regulating nut (7), a sliding screw sleeve (10), an elastic device, a fastening nut (12), a fixing rod (14), a spring blocking pin (4), a fixing ferrule (3), a scale sleeve (2), a sliding sleeve (6), a limiting jackscrew (8) and a fastening jackscrew (11); wherein,

the adjusting shaft (1) and the fixing rod (14) are both cylindrical hollow tubes or solid rods; the inner diameters of the upper part and the lower part of the sliding screw sleeve (10) are the same, the inner wall of the upper part of the sliding screw sleeve (10) is in sliding fit with the outer wall of the lower part of the adjusting shaft (1), and the inner wall of the lower part of the sliding screw sleeve (10) is in sliding fit with the outer wall of the upper part of the fixed rod (14);

the adjusting shaft (1) is sequentially provided with a scale sleeve (2), a stop spring pin (4), a fixed ferrule (3), an elastic device, a sliding sleeve (6) and a pressure regulating nut from top to bottom; wherein,

the inner wall of the upper part of the scale sleeve (2) is tightly matched with the adjusting shaft (1), and the lower part of the scale sleeve (2) is provided with a downward opening; the inner wall of the lower part of the sliding sleeve (6) is in sliding fit with the adjusting shaft (1); the upper part of the sliding sleeve (6) is opened upwards; the outer wall of the lower part of the scale sleeve (2) is in sliding fit with the inner wall of the upper part of the sliding sleeve (6); the spring blocking pin (4) and the elastic device are arranged in a space between the scale sleeve (2) and the sliding sleeve (6), the spring blocking pin (4) radially penetrates through a round hole formed in the adjusting shaft (1), a fixed ferrule (3) is radially arranged at the spring blocking pin, two ends of the spring blocking pin (4) are tightly matched with the round hole formed in the fixed ferrule (3) to prevent the spring blocking pin from being loosened and separated radially, the fixed ferrule (3) is tightly matched with the upper part of the scale sleeve (2), and the fixed ferrule (3) and the spring blocking pin (4) jointly limit the elastic device to move upwards; the pressure regulating nut (7) is positioned below the sliding sleeve (6), the inner wall of the lower part of the pressure regulating nut (7) is in threaded connection with the outer wall of the upper part of the sliding threaded sleeve (10), and can move up and down relative to the sliding threaded sleeve (10) so as to push the sliding sleeve (6) and the elastic device to move up and down together;

the upper part and the lower part of one side wall surface of the sliding screw sleeve (10) are respectively provided with a through limiting jackscrew hole and a through fastening jackscrew hole, a limiting jackscrew (8) and a fastening jackscrew (11) can be respectively screwed and abutted to the lower part of the adjusting shaft (I) and the upper part of the fixed rod (14), and the adjusting shaft (1) and the fixed rod (14) can be prevented from rotating and moving up and down in the horizontal direction after being screwed; the sliding fit screw sleeve (10) and the adjusting shaft (1) are also provided with a sliding connection structure;

the inner wall of the upper part of the fastening nut (12) is in threaded connection with the outer wall of the lower end of the sliding threaded sleeve, and the inner wall of the lower end of the fastening nut (12) is in sliding fit with the outer wall of the fixed rod (14); two pin holes which are communicated in the radial direction are arranged on the fixed rod (14) at different axial heights; the two pipe clamping pins penetrate through the pin holes of the fixing rod (14) in the radial direction and are clamped on the upper bottom surface and the lower bottom surface of the lower end of the fastening nut (12) respectively, the fixing rod can be driven to move up and down along with the up-and-down movement of the fastening nut, and the pipe clamping pins can horizontally rotate relative to the fastening nut (12).

As a preferred embodiment of the elastic means, the elastic means consist of a spring, the spring (5) being placed between the catch spring pin (4) and the sliding sleeve (6); the outer wall of the scale sleeve (2) is provided with a pressure scale according to the pressure of the elastic device.

As another preferred embodiment of the elastic means, the elastic means is composed of a spring, a pressure sensor, a connection tube, a pressure display, wherein,

the spring is arranged between the stop spring pin and the pressure sensor, and the pressure sensor is positioned above the sliding sleeve and the pressure regulating nut;

and, set up the slot hole that link up to the upper end opening part on the slip sleeve wall, the pressure sensor connecting pipe of being convenient for wears out, and pressure display is connected to connecting pipe one end, and the other end is connected with pressure sensor.

As a preferred embodiment of the sliding connection between the adjusting shaft and the sliding screw sleeve, the sliding connection structure between the sliding screw sleeve (10) and the adjusting shaft (1) is as follows: the lower part of the adjusting shaft (1) is radially provided with a limiting pin hole, the upper part of the sliding fit screw sleeve (10) is provided with a limiting hole with two radial through sides, and a limiting pin (9) radially penetrates through the limiting hole of the sliding fit screw sleeve and the limiting pin hole at the lower part of the adjusting shaft to prevent the adjusting shaft (1) from rotating in the horizontal direction; the axial length of the limiting pin hole is larger than the transverse length, so that the adjusting shaft can slightly move downwards relative to the sliding screw sleeve under the action of axial force.

The sliding connection between the adjusting shaft and the sliding fit screw sleeve can also be designed into a guide flat key type to slide and prevent rotation, a guide flat key groove corresponding to the guide flat key is arranged on the inner wall of the upper portion of the sliding fit screw sleeve and the outer wall of the lower portion of the adjusting shaft, the guide flat key groove arranged on the outer wall of the lower portion of the adjusting shaft is slightly longer than the guide flat key, the guide flat key is fixedly connected with the sliding fit screw sleeve through a fastening pin, an anti-falling screw is arranged at the top end of the lower portion of the adjusting shaft, and the anti-falling screw is in threaded connection with.

Preferably, the outer wall of the middle part of the sliding fit screw sleeve is an irregular hexagonal surface, and the thickness of the wall of one side provided with the limiting jackscrew is increased, so that the limiting jackscrew and the fastening jackscrew can be conveniently pressed; the outer walls of the sliding screw sleeve corresponding to the inner walls of the upper part and the lower part are cylindrical surfaces; the upper end of the adjusting shaft and the lower end of the fixed rod can be made into structures with other shapes or connected with other fixed structures and correspondingly matched and connected with various external fixed support fixed structures; the lower part of the adjusting shaft and the upper part of the fixing rod are provided with a plane, and the limiting jackscrew and the fastening jackscrew can be screwed in and abut against the plane.

A pressure-adjustable combined type external fixing support for orthopedic clinical application adopts 1 pressure-adjustable fixing arm, and is combined with a bar needle clamping block or a bar needle clamping block, a bar rod clamping block and a fixing bar to form a single-arm pressure-adjustable combined type external fixing support.

A pressure-adjustable combined type external fixing support for orthopedic clinical application adopts 2 pressure-adjustable fixing arms, and is combined with 2 semi-rings, bar clamping blocks, bar needle clamping blocks and fixing bars to form a semi-ring type pressure-adjustable combined type external fixing support.

The combined type external fixing support capable of adjusting the pressure in the orthopedic clinical application adopts 3 or 6 pressure-adjustable fixing arms, and combines the pressure-adjustable fixing arms with 4 or 5 circular rings or partial circular rings, threaded rods, fixing nuts, pin fixing screws, adjusting wheels and threaded columns to form a ring type combined type external fixing support capable of adjusting the pressure.

The needle clamping block can be any one of I type needle clamping block, II type needle clamping block and III type needle clamping block, wherein

I type bar needle clamp block: the clamping device consists of a clamping block A, a clamping block a, a clamping block B, a clamping block B, a gasket, a fastening screw, a sealing head nail and a spreading spring; the clamping block A, the clamping block a, the clamping block B and the clamping block B are all arranged to have one end as an arc-shaped surface and the other end as a plane, a round hole corresponding to the fastening screw is arranged in the center, and the central round hole of the clamping block A is in threaded connection with the head end of the fastening screw; one end of the arc-shaped surface of the corresponding surface of the clamping block A and the clamping block a is provided with a groove which is matched with the fixed rod and the adjusting shaft, and one end of the plane is provided with a convex surface and a concave surface which are corresponding to each other; one end of the arc-shaped surface of the corresponding surface of the clamping block B and the clamping block B is provided with a groove which is matched with the bone screw and the fixed steel needle, one end of the plane is provided with a convex surface and a concave surface which are corresponding to each other, the periphery of the central hole of the corresponding surface of the clamping block a and the clamping block B is provided with a circular corresponding anti-rotation tooth surface, the clamping block a and the clamping block B are separated by a spreading spring, the head end of the fastening screw is hollow and is in threaded connection with the end socket screw, and the gasket is positioned between the clamping block B and the;

II type bar needle clamping block: the ball head clamping block is composed of a clamping block D, a clamping block D, a fastening screw, a ball head clamping block, a tail nail and a gasket, wherein one corresponding surface of the clamping block D and the clamping block D is provided with a corresponding arc-shaped groove and a corresponding spherical groove which are used for fixing a fixing rod, an adjusting shaft and the ball head clamping block; the centers of the clamping block D and the clamping block D are provided with center holes corresponding to the fastening screws, the clamping block D is in threaded connection with the fastening screws, and grooves corresponding to the gaskets are arranged around the center holes of the surfaces of the clamping block D corresponding to the tail ends of the fastening screws; the head end of the ball head clamping block is spherical, the tail end of the ball head clamping block is hollow cylindrical, the tail end of the ball head clamping block is in threaded connection with a tail screw, and a through circular hole is radially formed and used for fixing a bone screw and a bone needle;

type III bar needle clamping block: consists of a central disc, a needle fixing disc, a rod fixing clamping block and a fastening screw; the central disc is disc-shaped, a round hole is arranged at the center, anti-rotation tooth surfaces are arranged on the peripheries of the upper surface and the lower surface, the needle fixing disc is concave disc-shaped, a round hole is arranged at the center, anti-rotation tooth surfaces are arranged on the peripheries, a through disc groove is radially arranged on the periphery, and a bone screw or a bone needle is fixed; a round hole is formed in the center of the rod fixing clamping block and is in threaded connection with a fastening screw, and 1 arc-shaped groove and 2 support columns are formed in the periphery of the rod fixing clamping block and are used for fixing a fixing rod and an adjusting shaft;

the rod clamping block can be any one of an I-type rod clamping block, an II-type rod clamping block and a III-type rod clamping block, wherein

Type I rod clamp: the clamping device consists of a clamping block A, a clamping block a, a clamping block B, a clamping block B, a gasket, a fastening screw, a sealing head nail and a spreading spring; the clamping block A, the clamping block a, the clamping block B and the clamping block B are all arranged to have one end as an arc-shaped surface and the other end as a plane, a round hole corresponding to the fastening screw is arranged in the center, and the central round hole of the clamping block A is in threaded connection with the head end of the fastening screw; one end of the arc-shaped surface corresponding to the clamping block A, the clamping block a, the clamping block B and the clamping block B is provided with a groove corresponding to the fixed rod and the adjusting shaft, and one end of the plane is provided with a convex surface and a concave surface corresponding to each other; circular corresponding anti-rotation tooth surfaces are arranged around central holes of corresponding surfaces of the clamping block a and the clamping block B, the clamping block a and the clamping block B are separated by a spreading spring, the head end of a fastening screw is hollow and is in threaded connection with an end socket screw, and a gasket is positioned between the clamping block B and the tail end of the fastening screw;

type II rod clamp: the clamping device consists of a central disc, a rod fixing clamping block A, a rod fixing clamping block a and a fastening screw; the center disc is disc-shaped, the center is provided with a round hole matched with a fastening screw, the peripheries of the upper surface and the lower surface are provided with anti-rotation tooth surfaces, the centers of a rod fixing clamping block A and a rod fixing clamping block a are provided with round holes matched with the fastening screw, the rod fixing clamping block a is in threaded connection with the fastening screw, and the peripheries of the rod fixing clamping block A and the rod fixing clamping block a are provided with 1 arc-shaped groove and 2 pillars for fixing a fixing rod and an adjusting shaft;

type III rod clamp: the clamping block E and the cambered surface end of the clamping block E are respectively provided with a clamping block round hole which penetrates through the fixed rod and the adjusting shaft correspondingly, one end of a plane is provided with a clamping block round hole which penetrates through the clamping block round hole correspondingly to the fastening screw, the plane blocks are separated by about 2mm of clearance, the two hole directions are perpendicular to each other, the anti-rotation tooth surfaces are arranged on the corresponding surfaces of the clamping block E and the clamping block E, the other surface of the clamping block E is in threaded connection with the head end of the fastening screw, and the gasket is arranged between the clamping block E and the tail end of the fastening screw.

The invention firstly provides an improved pressure regulating fixing arm, and then the pressure regulating fixing arm, a needle clamping block or a rod clamping block and the like are combined into a single-arm type fixing support, a semi-ring type fixing support and a ring type fixing support which can regulate the pressure. The beneficial effects of the invention are as follows:

firstly, compared with the original external fixing frame elastic device, the pressure regulating fixing arm of the combined external fixing support capable of regulating pressure is redesigned in the aspect of main body structure, and is changed into the combination of a sliding screw sleeve, a pressure regulating nut and a fastening nut from the original integral cylinder barrel, and the elastic device is positioned above the pressure regulating nut, so that the assembly of the elastic device and the pressure conduction device is easy and simple;

secondly, a fastening nut is added, and two pin holes which are communicated in the radial direction are formed in different axial heights of the fixing rod; after the two tube clamping pins radially penetrate through the pin holes of the fixing rod, the two tube clamping pins are respectively matched with the upper step and the lower step of the fastening nut and the lower end of the fastening nut, so that the fixing rod can not be constrained in circumferential rotation, and simultaneously, the fixing rod is driven to accurately move along with the up-and-down movement of the fastening nut, and the tube clamping device has the advantages of facilitating accurate restoration of a fracture end, pressurizing during operation, accurately adjusting the gap of the fracture end at any time after the operation and the like;

thirdly, the fixed ferrule arranged in the radial direction of the adjusting shaft can be in tight interference fit with the two ends of the spring stopping pin, and the spring stopping pin has the advantage of preventing the spring stopping pin from loosening and falling off; the limiting jackscrew and the fastening jackscrew are arranged on the sliding fit screw sleeve, so that the sliding fit screw sleeve has the advantages of convenience in operation, easiness in fixing and limitation on the sliding of the adjusting shaft and the fixing rod; the adjusting shaft and the fixing rod can be matched and fixed with various rod needle clamping blocks and rod clamping blocks, and the bone fracture fixing device has the advantages of being simple in operation, convenient to fix and beneficial to fracture reduction and fixation.

In summary, when the limiting jackscrew is screwed out, the adjusting shaft is driven to move downwards and pressurize by the axial pressure of the fractured bone under the axial pressure through the fixing screw, the bone pin and the upper end and the lower end of the external fixing frame, the spring is compressed, and the adjusting shaft can slightly move downwards and accordingly drive and control the fractured bone to conduct stress, so that callus generation at the fractured end can be stimulated under the stress action of the fractured end, and stress shielding at the fractured end is avoided. For comminuted fracture, the fracture block is easy to shift by axial stress at the early stage of fracture healing, a limit jackscrew needs to be screwed in to limit the adjusting shaft to move downwards, the fracture end does not generate micro motion and stress, and when the fracture block is healed to be not easy to shift, the limit jackscrew is screwed out. When the fractured bone is subjected to axial stress, callus generation at the fractured end can be stimulated, osteoporosis caused by stress shielding of the external fixing frame is avoided, the fracture healing speed can be accelerated, the strength of healed bone is increased, and delayed fracture healing or nonunion can be effectively prevented.

Drawings

The drawings are described below

FIG. 1 is a schematic view of a pressure adjustable combination type outer fixed bracket single arm type I structure composed of a pressure adjustable fixed arm according to a first embodiment and a needle clamping block

FIG. 2 is a schematic view of a pressure-adjustable combined type II-type structure of an outer fixing bracket with a single arm, which is composed of a pressure-adjustable fixing arm according to a second embodiment and a needle clamping block

FIG. 3 is a schematic view of a pressure adjustable combined type III-type structure of a pressure adjustable combined type external fixing bracket formed by a third embodiment of a pressure adjustable fixing arm and a needle clamping block

FIG. 4 is a schematic view of a pressure adjustable combination type external fixation frame single arm IV type structure composed of a fourth embodiment of a pressure adjustable fixation arm and a needle clamping block

FIG. 5 is a schematic view of an I-shaped structure of a needle clamp

FIG. 6 is a schematic view of a II-shaped structure of a needle clip

FIG. 7 is a schematic view of a type III structure of a needle clip

FIG. 8 is a schematic view of an I-shaped rod clamp

FIG. 9 is a schematic view of a type II rod clamp

FIG. 10 is a schematic view of type III rod clip

FIG. 11 is a schematic view of a pressure-adjustable semi-ring type I-shaped structure of a combined external fixation frame

FIG. 12 is a schematic view of a pressure-adjustable semi-ring type II structure of a combined external fixation frame

FIG. 13 is a schematic view of a pressure-adjustable semi-ring III-type structure of a combined external fixation frame

FIG. 14 is a schematic view of a pressure-adjustable semi-ring type IV-shaped structure of a combined external fixation frame

FIG. 15 is a schematic view of a ring-type I-shaped structure of a pressure adjustable combined external fixation frame

FIG. 16 is a schematic view of a pressure-adjustable ring-type II structure of a combined external fixation frame

FIG. 17 is a schematic view of a pressure-adjustable ring-type III structure of a combined external fixation frame

FIG. 18 is a schematic view of a pressure adjustable combined type external fixing bracket ring type IV structure

FIG. 19 is a schematic view of a pressure adjustable ring-type V-shaped structure of a combined external fixation frame

FIG. 20 is a schematic view of a pressure-adjustable ring VI of the combined external fixation frame

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the specification, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments of the present invention belong to the protection scope of the present invention.

The combined external fixing frame capable of adjusting pressure is divided into 3 combination forms of single arm type, semi-ring type and ring type.

The 1 pressure regulating fixing arm is combined with the bar needle clamping block or the bar needle clamping block, the bar rod clamping block and the fixing bar into a single-arm type pressure-adjustable external fixing support.

2 pressure regulating fixed arms, 2 semi-rings, rod and bar clamping blocks and fixed bars are combined into a semi-ring type pressure-adjustable external fixed support

3 or 6 pressure regulating fixed arms, 4 or 5 rings or 2/3 rings, a threaded rod, a fixed nut, a needle fixing screw, a regulating wheel and a threaded upright column are combined to form the ring type pressure regulating outer fixed support.

The pressable retention arm generally includes the following structure: the device comprises an adjusting shaft (1), a pressure regulating nut (7), a sliding screw sleeve (10), an elastic device, a fastening nut (12), a fixing rod (14), a spring blocking pin (4), a fixing ferrule (3), a scale sleeve (2), a sliding sleeve (6), a limiting jackscrew (8) and a fastening jackscrew (11); wherein (a),

the upper part and the lower part of one side wall surface of the sliding screw sleeve (10) are respectively provided with a through limiting jackscrew hole and a through fastening jackscrew hole, a limiting jackscrew (8) and a fastening jackscrew (11) can be respectively screwed and abutted to the lower part of the adjusting shaft (1) and the upper part of the fixed rod (14), and the adjusting shaft (1) and the fixed rod (14) can be prevented from rotating and moving up and down in the horizontal direction after being screwed; the sliding fit screw sleeve (10) and the adjusting shaft (1) are also provided with a sliding connection structure;

Fig. 1 is a single-arm type I-shaped structure of a combined external fixing bracket capable of adjusting pressure, wherein a pressure-adjustable fixing arm is a first embodiment, that is, the pressure-adjustable fixing arm is further arranged on the basis of the general structure of the pressure-adjustable fixing arm: the lower part of the adjusting shaft (1) is provided with a limit pin hole, the sliding screw sleeve (10) is arranged to have the same inner diameter of the upper part and the lower part, the sliding screw sleeve (10) is radially provided with a limit pin (9), the limit pin (9) corresponds to the limit pin hole arranged at the lower part of the adjusting shaft (1), and the spring (5) is arranged between the spring blocking pin (4) and the sliding sleeve (6).

Fig. 2 is a single-arm type II structure of a combined external fixing bracket capable of adjusting pressure, wherein the pressure-adjustable fixing arm is a second embodiment, that is, the pressure-adjustable fixing arm is further configured on the basis of the above-mentioned overall structure of the pressure-adjustable fixing arm: the lower part of the adjusting shaft (1) is provided with a limit pin hole, the sliding screw sleeve (10) is arranged to have the same inner diameter at the upper part and the lower part, the sliding screw sleeve (10) is radially provided with a limit pin (9), the limit pin (9) corresponds to the limit pin hole arranged at the lower part of the adjusting shaft (1), the spring (5) is arranged between the spring blocking pin (4) and the pressure sensor (18), the pressure sensor (18) is positioned above the sliding sleeve (6), and the pressure sensor (18) is connected with the pressure display (17) through the connecting pipe (16).

Fig. 3 shows a single arm type III structure of a combined external fixing bracket capable of adjusting pressure, wherein the pressure-adjustable fixing arm is a third embodiment, that is, the pressure-adjustable fixing arm is further arranged on the basis of the above-mentioned general structure of the pressure-adjustable fixing arm: adjusting spindle (1) lower part sets up anticreep screw (21), sliding connection between adjusting spindle (1) and sliding fit swivel nut (10) establishes to direction parallel key (19) and prevents soon, set up at sliding fit swivel nut (10) upper portion inner wall and adjusting spindle (1) lower part outer wall and lead the corresponding keyway of parallel key (19), direction parallel key (19) and sliding fit swivel nut (10) are with fastening pin (20) fastening connection, adjusting spindle (1) lower part top sets up anticreep screw (21), anticreep screw (21) and adjusting spindle (1) lower part threaded connection, spring (5) are arranged in and are kept off between spring pin (4) and sliding sleeve (6).

Fig. 4 shows a pressure adjustable single arm type IV structure of a combined external fixing bracket, wherein the pressure adjustable fixing arm is a fourth embodiment, that is, the pressure adjustable fixing arm is further configured on the basis of the above-mentioned general structure of the pressure adjustable fixing arm: adjusting shaft (1) lower part sets up anticreep screw (21), sliding connection between adjusting shaft (1) and sliding fit swivel nut (10) sets up to direction parallel key (19) and prevents soon, set up at sliding fit swivel nut (10) upper portion inner wall and adjusting shaft (1) lower part outer wall and lead the corresponding keyway of parallel key (19), direction parallel key (19) and sliding fit swivel nut (10) are with fastening pin (20) fastening connection, adjusting shaft (1) lower part top sets up anticreep screw (21), anticreep screw (21) and adjusting shaft (1) lower part threaded connection, spring (5) are arranged in and are kept off between spring pin (4) and pressure sensor (18), pressure sensor (18) are located sliding sleeve (6) top, pressure sensor (18) are connected with pressure display (17) through connecting pipe (16).

In the embodiment of fig. 1 and 3, further, a pressure scale is arranged on the outer wall of the scale sleeve (2) according to the pressure of the elastic device.

In the embodiment shown in fig. 2 and 4, furthermore, a long hole penetrating to the opening at the upper end is arranged on the wall of the sliding sleeve (6) to facilitate the penetration of the pressure sensor connecting pipe, one end of the connecting pipe (16) is connected with the pressure display (17), and the other end is connected with the pressure sensor (18).

In the embodiment of fig. 1-4, further, the outer wall of the middle part of the sliding fit screw sleeve (10) is an irregular hexagonal surface, and the thickness of the wall of the side provided with the limiting jackscrew (8) is increased, so that the limiting jackscrew (8) and the fastening jackscrew (I1) can be conveniently pressed; the outer walls of the sliding screw sleeve (10) corresponding to the inner walls of the upper part and the lower part are cylindrical surfaces. The upper end of the adjusting shaft (1) and the lower end of the fixed rod (14) can be made into structures with other shapes or connected with other fixed structures and correspondingly matched and connected with various fixed structures of the external fixed bracket. The lower part of the adjusting shaft (1) and the upper part of the fixing rod (14) are provided with a plane, and the limiting jackscrew (8) and the fastening jackscrew (11) can be screwed into and abut against the plane.

The fixed clamping block is divided into a rod needle clamping block (15) and a rod clamping block (56), can be set into various forms, and is fixedly connected with the adjusting shaft (1), the fixed rod (14), the semi-ring (57) and the fixed rod.

The needle clamping block (15) can be set into a type I needle clamping block, a type II needle clamping block, a type III needle clamping block and the like; the rod clamping block (56) can be set into a type I rod clamping block, a type II rod clamping block, a type III rod clamping block and the like.

Fig. 5 shows a needle bar clamp I-shaped structure, which is composed of a clamping block a (23), a clamping block a (24), a clamping block B (25), a clamping block B (27), a gasket (28), a fastening screw (29), a sealing head nail (22) and a spreading spring (26). One end of each of the clamping block A (23), the clamping block a (24), the clamping block B (25) and the clamping block B (27) is an arc-shaped surface, the other end of each of the clamping block A and the clamping block B is a plane, a round hole corresponding to the fastening screw (29) is formed in the center of each of the clamping block A and the clamping block a, the clamping block a (24), the clamping block B and the clamping block B, and the center round hole of each of the. The clamping block A (23) and the clamping block a (24) are provided with grooves corresponding to the fixed rod (14) and the adjusting shaft (1) at the ends corresponding to the arc surfaces, and the convex surface and the concave surface are correspondingly arranged at one end of the plane. The clamp block B (25) and the clamp block B (27) are provided with a bone screw and a groove corresponding to a fixed steel needle at one end of a corresponding surface arc-shaped surface, a convex surface and a concave surface corresponding to each other are arranged at one end of a plane, a circular corresponding anti-rotation tooth surface is arranged around a central hole of the corresponding surface of the clamp block a (24) and the clamp block B (25), the clamp block a (24) and the clamp block B (25) are separated by a spreading spring (26), the head end of a fastening screw (29) is hollow and is in threaded connection with a head nail (22), and a gasket (28) is positioned between the clamp block B (27) and the tail end of the fastening screw (29).

Fig. 6 is a II-shaped structure of the needle clip, which is composed of a clamping block D (33), a clamping block D (32), a fastening screw (35), a ball head clamping block (31), a tail nail (30) and a washer (34). The corresponding arc-shaped groove and the spherical groove are formed in the corresponding surfaces of the clamping block D (33) and the clamping block D (32) and are used for fixing the fixing rod (14), the adjusting shaft (1) and the ball head clamping block (31). Center holes corresponding to the fastening screws (35) are formed in the centers of the clamping blocks D (33) and D (32), the clamping blocks D (32) are in threaded connection with the fastening screws (35), and grooves corresponding to the gaskets (34) are formed in the peripheries of the center holes of the surfaces corresponding to the tail ends of the clamping blocks D (33) and the fastening screws (35). The head end of the ball head clamping block (31) is spherical, the tail end of the ball head clamping block is hollow cylindrical, the tail end of the ball head clamping block is in threaded connection with the tail nail (30), and a through round hole is radially formed for fixing the bone screw and the bone needle.

Fig. 7 is a rod needle clamp type III structure, which is composed of a central disc (38), a needle fixing disc (37), a rod fixing clamp block (39) and a fastening screw (36). The central disc (38) is disc-shaped, a round hole is arranged in the center, anti-rotation tooth surfaces are arranged on the peripheries of the upper surface and the lower surface, the needle fixing disc (37) is concave disc-shaped, a round hole is arranged in the center, anti-rotation tooth surfaces are arranged on the peripheries, a through disc groove is radially arranged, and a bone screw or a bone needle is fixed. The center of the rod fixing clamping block (39) is provided with a round hole which is in threaded connection with the fastening screw (36), and the periphery of the rod fixing clamping block is provided with 1 arc-shaped groove and 2 pillars for fixing the fixing rod (14) and the adjusting shaft (1).

Fig. 8 is a rod clamp I-shaped structure, which is composed of a clamping block a (41), a clamping block a (42), a clamping block B (43), a clamping block B (45), a gasket (46), a fastening screw (47), a sealing head nail (40) and an expanding spring (44). A (41), clamp splice a (42), clamp splice B (43), clamp splice B (45) all establish one end for the arcwall face, one end is the plane, and the center is established and is fastened screw (47) corresponding round hole, clamp splice A (41) center round hole and fastened screw (47) head end threaded connection. The clamping block A (41), the clamping block a (42), the clamping block B (43) and the clamping block B (45) are provided with grooves corresponding to the fixed rod (14) and the adjusting shaft (1) at one ends of the arc surfaces, and a convex surface and a concave surface corresponding to each other are arranged at one end of the plane. Circular corresponding anti-rotation tooth surfaces are arranged around central holes of corresponding surfaces of the clamping block a (42) and the clamping block B (43), the clamping block a (42) and the clamping block B (43) are separated by a spreading spring (44), the head end of a fastening screw (47) is hollow and is in threaded connection with the seal head nail (40), and a gasket (46) is positioned between the clamping block B (45) and the tail end of the fastening screw (47).

Fig. 9 is a rod clamp II type structure, which is composed of a central disc (50), a rod fixing clamp block (49), a rod fixing clamp block (51), and a fastening screw (48). Center disc (50) are discoid, and the center is established and is adapted round hole with fastening screw (48), and the tooth face is all prevented revolving by upper and lower face periphery, gu excellent clamp splice (49), gu excellent clamp splice (51) center is established and is adapted round hole with fastening screw (48), gu excellent clamp splice (51) and fastening screw (48) threaded connection, gu excellent clamp splice (49), gu excellent clamp splice (51) periphery establishes 1 arc recess and 2 pillars for fixed pole (14), regulating spindle (1).

Fig. 10 is a rod clamp type III structure, which is composed of a clamp block E (54), a clamp block E (55), a fastening screw (52), and a washer (53). Clamping block E (54), clamping block E (55) cambered surface one end all establish with dead lever (14), the corresponding clamping block round hole that runs through of regulating spindle (1), plane one end is established and is run through the clamping block round hole with fastening screw (52) are corresponding, separate with about 2mm clearance between its plane block, two hole directions are mutually perpendicular, clamping block E (54), the corresponding one side of clamping block E (55) sets up the tooth face of preventing soon, clamping block E (55) another side and fastening screw (52) head end threaded connection, establish packing ring (53) between clamping block E (54) and fastening screw (52) tail end.

The connection between the adjusting shaft (1) and the fixing rod (14) is designed into an arc-shaped or trapezoidal semi-ring (57), the semi-ring (57) is a rod or a tube, and the fixing rod is a solid rod or a hollow tube.

The ring type external fixing frame is characterized in that a ring of the ring type external fixing frame is a circular ring (60) or a partial ring (64), round holes are formed in the periphery of the ring, the ring (60) on the upper portion or the lower portion of the ring type external fixing frame is connected with the ring (60) or the partial ring (64) through a threaded rod (59), a fixing nut (58) is in threaded connection with the threaded rod (59), the ring (60) and an adjusting wheel (65) are located above and below the upper portion and the lower portion of the ring (60), the adjusting wheel (65) and a pressurizing fixing arm (62) are arranged on the threaded rod (59) between the upper portion and the lower portion of the ring (60), the threaded rod (59) is in threaded connection with the adjusting wheel (65), the fixing nut (58) is fixed, the adjusting wheel (65) is located above or below 5 ring intermediate rings, and the adjusting wheel (65) can move on the threaded rod (59. The circular ring (60) can be provided with a threaded upright post (63) for fixing the bone screw. The tail part of the needle fixing screw (61) is provided with a groove for fixing a bone needle.

Fig. 11 is a pressure adjustable combined type external fixing bracket half-ring type I-shaped structure, which is composed of 2 pressure adjusting fixing arms, a rod clamp (56) and a half ring (57), wherein the rod clamp (56) is connected with an adjusting shaft (1), a fixing rod (14) and the half ring (57). The lower part of an adjusting shaft (1) of the pressure adjusting fixing arm is provided with a limiting pin hole, a sliding screw sleeve (10) is arranged to have the same inner diameter of the upper part and the lower part, the sliding screw sleeve (10) is radially provided with a limiting pin (9), the limiting pin (9) corresponds to the limiting pin hole arranged on the lower part of the adjusting shaft (1), and a spring (5) is arranged between a spring blocking pin (4) and a sliding sleeve (6).

Fig. 12 is a pressure adjustable combined type external fixed bracket half-ring type 1I structure, which is composed of 2 pressure adjusting fixed arms, a rod clamp (56) and a half ring (57), wherein the rod clamp (56) is connected with an adjusting shaft (1), a fixed rod (14) and the half ring (57). The lower part of an adjusting shaft (1) of the pressure-adjusting fixing arm is provided with a limiting pin hole, a sliding screw sleeve (10) is arranged to have the same inner diameter at the upper part and the lower part, the sliding screw sleeve (10) is radially provided with a limiting pin (9), the limiting pin (9) corresponds to the limiting pin hole arranged at the lower part of the adjusting shaft (1), a spring (5) is arranged between a spring blocking pin (4) and a pressure sensor (18), the pressure sensor (18) is positioned above a sliding sleeve (6), and the pressure sensor (18) is connected with a pressure display (17) through a connecting pipe (16).

Fig. 13 is a pressure adjustable combined type external fixing bracket half-ring type III structure, which is composed of 2 pressure adjusting fixing arms, a rod clamp (56) and a half ring (57), wherein the rod clamp (56) is connected with an adjusting shaft (1), a fixing rod (14) and the half ring (57). Adjusting spindle (1) lower part sets up anticreep screw (21), sliding connection between adjusting spindle (1) and sliding fit swivel nut (10) establishes to direction parallel key (19) and prevents soon, set up at sliding fit swivel nut (10) upper portion inner wall and adjusting spindle (1) lower part outer wall and lead the corresponding keyway of parallel key (19), direction parallel key (19) and sliding fit swivel nut (10) are with fastening pin (20) fastening connection, adjusting spindle (1) lower part top sets up anticreep screw (21), anticreep screw (21) and adjusting spindle (1) lower part threaded connection, spring (5) are arranged in and are kept off between spring pin (4) and sliding sleeve (6).

Fig. 14 shows a pressure adjustable combination type external fixing bracket half-ring type IV structure, which is composed of 2 pressure adjusting fixing arms, a rod clamp (56), and a half ring (57), wherein the rod clamp (56) is connected with an adjusting shaft (1), a fixing rod (14), and the half ring (57). Adjusting shaft (1) lower part sets up anticreep screw (21), sliding connection between adjusting shaft (1) and sliding fit swivel nut (10) sets up to direction parallel key (19) and prevents soon, set up at sliding fit swivel nut (10) upper portion inner wall and adjusting shaft (1) lower part outer wall and lead the corresponding keyway of parallel key (19), direction parallel key (19) and sliding fit swivel nut (10) are with fastening pin (20) fastening connection, adjusting shaft (1) lower part top sets up anticreep screw (21), anticreep screw (21) and adjusting shaft (1) lower part threaded connection, spring (5) are arranged in and are kept off between spring pin (4) and pressure sensor (18), pressure sensor (18) are located sliding sleeve (6) top, pressure sensor (18) are connected with pressure display (17) through connecting pipe (16).

Fig. 15 is a combined type external fixed bracket ring type I structure capable of adjusting pressure, which is composed of 3 pressure adjusting fixed arms (62), 4 rings (60), a threaded rod (59), a fixed nut (58), a needle fixing screw (61) and a threaded upright post (63), wherein the pressure adjusting fixed arms (62) are positioned between 2 rings (60) at the upper part and 2 rings (60) at the lower part, and the pressure adjusting fixed arms (62) are of a type without a pressure gauge.

Fig. 16 is a combined type outer fixed bracket ring type II structure capable of adjusting pressure, which is composed of 3 pressure adjusting fixed arms (62), 4 rings (60), a threaded rod (59), a fixed nut (58), a needle fixing screw (61) and a threaded upright post (63), wherein the pressure adjusting fixed arms (62) are positioned between 2 upper rings (60) and 2 lower rings (60), and the pressure adjusting fixed arms (62) are in a pressure meter type.

Fig. 17 is a pressure-adjustable combined type III-type structure with an external fixed bracket ring, which is composed of 6 pressure-adjusting fixed arms (62), 4 rings (60), 1 partial ring (64), a threaded rod (59), a fixed nut (58), a fixed pin screw (61), a threaded upright post (63) and an adjusting wheel (65), wherein the pressure-adjusting fixed arms (62) are positioned between the upper 2 rings (60) and the lower 2 rings (60) and the middle ring (60), the adjusting wheel (65) is arranged on the threaded rod (59) between the lower ring (60) and the middle ring (60), the adjusting wheel (65) can move on the threaded rod (59) to drive the middle ring (60) to move, and the pressure-adjusting fixed arms (62) are of a pressure-free type.

Fig. 18 is a pressure-adjustable combined type IV-shaped structure with an external fixed bracket ring, which is composed of 6 pressure-adjusting fixed arms (62), 4 rings (60), 1 partial ring (64), a threaded rod (59), a fixed nut (58), a fixed pin screw (61), a threaded upright post (63), and an adjusting wheel (65), wherein the pressure-adjusting fixed arms (62) are located between the upper 2 rings (60) and the lower 2 rings (60) and the middle ring (60), the adjusting wheel (65) is arranged on the threaded rod (59) between the lower ring (60) and the middle ring (60), the adjusting wheel (65) can move on the threaded rod (59) to drive the middle ring (60) to move, and the pressure-adjusting fixed arms (62) are of a pressure meter type.

Fig. 19 is a pressure-adjustable combined type V-shaped structure with an external fixed bracket ring, which is composed of 3 pressure-adjusting fixed arms (62), 4 rings (60), 1 partial ring (64), a threaded rod (59), a fixed nut (58), a pin fixing screw (61), a threaded upright post (63) and an adjusting wheel (65), wherein the pressure-adjusting fixed arms (62) are located between the lower 2 rings (60) and the middle ring (60), the adjusting wheel (65) is arranged on the threaded rod (59) between the lower ring (60) and the middle ring (60), the adjusting wheel (65) can move on the threaded rod (59) to drive the middle ring (60) to move, the upper ring (60) and the middle ring (60) are connected by the threaded rod (59), and the pressure-adjusting fixed arms (62) are of a pressure-free meter type.

Fig. 20 is a pressure-adjustable combined VI-type structure with an external fixed ring, which is composed of 3 pressure-adjusting fixed arms (62), 4 rings (60), 1 partial ring (64), a threaded rod (59), a fixing nut (58), a pin-fixing screw (61), a threaded column (63) and an adjusting wheel (65), wherein the pressure-adjusting fixed arms (62) are located between the lower 2 rings (60) and the middle ring (60), the adjusting wheel (65) is arranged on the threaded rod (59) between the lower ring (60) and the middle ring (60), the adjusting wheel (65) can move on the threaded rod (59) to drive the middle ring (60) to move, the upper ring (60) and the middle ring (60) are connected by the threaded rod (59), and the pressure-adjusting fixed arms (62) are of a pressure meter type.

From the above description of the embodiments, it is clear to those skilled in the art that the present invention can be realized by other structures, especially by combining the above pressure-adjusting fixing arms with rod-bar clamping blocks, rod-needle clamping blocks, half rings or rings to form various fixing brackets, and therefore, the features of the present invention are not limited to the above preferred embodiments. Any changes or modifications that can be easily conceived by those skilled in the art are also intended to be covered by the scope of the present invention.

Claims

1. A pressable fixation arm for orthopedic clinical use, said pressable fixation arm comprising: the device comprises an adjusting shaft (1), a pressure regulating nut (7), a sliding screw sleeve (10), an elastic device, a fastening nut (12), a fixing rod (14), a spring blocking pin (4), a fixing ferrule (3), a scale sleeve (2), a sliding sleeve (6), a limiting jackscrew (8) and a fastening jackscrew (11); wherein,

2. A pressure adjustable fixing arm according to claim 1, characterized in that the resilient means consist of a spring (5), wherein the spring (5) is placed between the catch spring pin (4) and the sliding sleeve (6); the outer wall of the scale sleeve (2) is provided with a pressure scale according to the pressure of the elastic device.

3. A pressure adjustable fixing arm according to claim 1, wherein the elastic means is composed of a spring (5), a pressure sensor (18), a connecting tube (16), a pressure display (17),

the spring (5) is arranged between the spring stop pin (4) and the pressure sensor (18), and the pressure sensor (18) is positioned above the sliding sleeve (6) and the pressure regulating nut (7);

and a long hole penetrating to an opening at the upper end is formed in the wall of the sliding sleeve (6), so that the connecting pipe can penetrate out conveniently, one end of the connecting pipe (16) is connected with the pressure display (17), and the other end of the connecting pipe is connected with the pressure sensor (18).

4. A pressure adjustable fixing arm according to any of claims 1-3, wherein the sliding connection between the sliding fit screw sleeve (10) and the adjusting shaft (1) is: the lower part of the adjusting shaft (1) is radially provided with a limiting pin hole, the upper part of the sliding fit screw sleeve (10) is provided with a limiting hole with two radial through sides, and a limiting pin (9) radially penetrates through the limiting hole of the sliding fit screw sleeve and the limiting pin hole at the lower part of the adjusting shaft to prevent the adjusting shaft (1) from rotating in the horizontal direction; the axial length of the limiting pin hole is larger than the transverse length, so that the adjusting shaft can slightly move downwards relative to the sliding screw sleeve under the action of axial force.

5. The pressure-adjustable fixing arm as claimed in any one of claims 1 to 3, wherein the sliding connection between the sliding screw sleeve (10) and the adjusting shaft (1) can also be designed to be a guiding flat key type to slide and prevent rotation, key grooves corresponding to the guiding flat key are arranged on the inner wall of the upper part of the sliding screw sleeve (10) and the outer wall of the lower part of the adjusting shaft (1), the key groove of the guiding flat key arranged on the outer wall of the lower part of the adjusting shaft is slightly longer than the guiding flat key (19), the guiding flat key (19) is tightly connected with the sliding screw sleeve (10) through a fastening pin (20), the bottom end of the lower part of the adjusting shaft (1) is provided with an anti-disengaging screw (21), and the anti-disengaging screw (21) is in threaded connection with the lower part of.

6. The pressure-adjustable fixing arm according to any one of claims 1-3, wherein the outer wall of the middle part of the sliding fit screw sleeve (10) is an irregular hexagonal surface, and the thickness of the wall of one side of the sliding fit screw sleeve (10) provided with the limiting jackscrew and the fastening jackscrew is increased, so that the pressure of the limiting jackscrew and the fastening jackscrew is facilitated; the outer walls of the sliding screw sleeve corresponding to the inner walls of the upper part and the lower part are cylindrical surfaces;

the upper end of the adjusting shaft and the lower end of the fixed rod can be made into structures with other shapes or connected with other fixed structures and correspondingly matched and connected with various external fixed support fixed structures;

the lower part of the adjusting shaft is provided with a plane which can be screwed in and abutted against the limit jackscrew.

7. An adjustable pressure combined type external fixing bracket for orthopedic clinical application, which is characterized in that 1 adjustable pressure fixing arm according to any one of claims 1-6 is combined with a bar needle clamping block or a bar needle clamping block, a bar rod clamping block and a fixing bar to form a single-arm type adjustable pressure combined type external fixing bracket.

8. An adjustable pressure combined external fixation bracket for orthopedic clinical application, characterized in that 2 adjustable pressure fixation arms according to any one of claims 1-6 are combined with 2 semi-rings, bar clamping blocks, bar needle clamping blocks and fixation bars to form a semi-ring type adjustable pressure combined external fixation bracket.

9. An adjustable pressure combined external fixation frame for orthopedic clinical application, characterized in that 3 or 6 adjustable pressure fixation arms according to any one of claims 1-6 are combined with 4 or 5 rings or partial rings, threaded rods, fixation nuts, pin fixation screws, adjustment wheels, threaded columns to form a ring type adjustable pressure combined external fixation frame.

10. The combined external fixation support of claim 7 or 8, wherein the needle clamping block is any one of type I needle clamping block, type II needle clamping block and type III needle clamping block, wherein

Type I rod clamp: the clamping device consists of a clamping block A, a clamping block a, a clamping block B, a clamping block B, a gasket, a fastening screw, a sealing head nail and a spreading spring; the clamping block A, the clamping block a, the clamping block B and the clamping block B are all arranged to have one end as an arc-shaped surface and the other end as a plane, a round hole corresponding to the fastening screw is arranged in the center, and the central round hole of the clamping block A is in threaded connection with the head end of the fastening screw; one end of the arc-shaped surface corresponding to the clamping block A, the clamping block a, the clamping block B and the clamping block B is provided with a groove corresponding to the fixed rod and the adjusting shaft, and one end of the plane is provided with a convex surface and a concave surface corresponding to each other; circular corresponding anti-rotation tooth surfaces are arranged around central holes of corresponding surfaces of the clamping block a and the clamping block B, the clamping block a and the clamping block B are separated by a spreading spring, the head end of a fastening screw is hollow and is in threaded connection with an end socket screw, and a gasket is positioned between the clamping block B and the tail end of the fastening screw; a