A novel combined external fixator with adjustable pressure and an adjustable pressure fixing device

Abstract

This application relates to a new type of adjustable-pressure combined external fixator and an adjustable-pressure fixing device. The adjustable-pressure fixing device includes: an adjusting rod, a sliding mating nut, an elastic device, a fixing rod, and a fixing structure for fixing the adjusting rod. Compared with the original fixing rod, the adjustable-pressure fixing device of this application has almost completely redesigned the main structure. It has changed from the original simple connecting rod to a combination of an adjusting rod, a sliding nut, an elastic device, a unidirectional and bidirectional pressure-regulating device, and a fixing rod. This kind of micro-motion device can reduce the stress shielding of the external fixator and avoid osteoporosis. Secondly, the bidirectional pressure-regulating device is more precise and can achieve upward or downward pressure regulation according to the specific conditions of the patient, thus conveniently and effectively realizing the advantage of pressure regulation; finally, the fixing structure of the fixing rod and the adjusting rod makes the fixing of the fixing rod and the adjusting rod more firm.

Description

Technical Field

[0001] The present invention relates to a device for orthopedic clinical applications, and more particularly to an adjustable pressure fixation and an elastic external fixation bracket including the adjustable pressure fixation device. Background Art

[0002] When fractures occur in the long tubular bones of the human limbs, it is often necessary to reduce and fix the fractures. Corresponding fixation techniques and materials are constantly evolving and updating, such as steel plates, intramedullary nails, external fixation brackets, etc. The currently commonly used internal fixation device is a steel plate, which has disadvantages such as a large surgical fixation range, a lot of soft tissue dissection, large trauma, and poor reduction. After the operation, there are disadvantages such as osteoporosis, loosening of the fixation device, and even breakage of the internal fixation rod due to stress shielding. When the internal fixation fails, it is necessary to perform a second operation or even multiple operations, seriously affecting the curative effect.

[0003] The process of fracture healing is complex. Scholars at home and abroad have continuously improved their understanding of the fracture healing theory. The view of rigid fixation of fractures advocated in the early stage has been confirmed through decades of clinical practice and experimental research. Due to the stress shielding effect of the fixation device, osteoporosis and breakage of the fixed bone are likely to occur. The view of a reasonable biological osteosynthesis has gradually been accepted. Fracture healing is affected by many factors such as patient age, mechanical environment, local blood supply, and endocrine. Stress is one of the main factors. Although the existing various fixation devices have different shapes and structures, they cannot be adjusted microscopically. Stress shielding and osteoporosis are likely to occur during application. Some can be adjusted microscopically, but they cannot accurately limit the range, direction, and magnitude of the micro-movement.

[0004] Regarding stress and fracture healing: Bone tissue is a viscoelastic solid material with complex mechanical properties. Its structure and function are closely related to its mechanical characteristics and mechanical environment state, which determines that different stress stimuli have different influences on bone metabolism and bone healing. In terms of the stress action mechanism: Stress affects the cell signal transduction pathway during fracture healing. It can transmit extracellular matrix signals into cells through calcium channels, integrins, growth factors, etc. expressed on the cell membrane or existing across the membrane. The mechanical signal coupling, cell proliferation, and intracellular and intercellular Ca of osteoblasts 2+It is related to the horizontal lifting. Integrin is the main substance that connects intracellular and extracellular signals. Under the stimulation of external tensile stress, it can induce physiological and biochemical changes in osteoblasts, respond and conduct signals, activate gene expression, synthesize and release cytokines and hormones, and regulate the sensing, proliferation, differentiation, and mineralization of mechanical stimuli. The expression level of integrin has the characteristic of time-limited change. Regulation of osteoblast metabolism and cytokines by stress: The secretion of growth factors induced by stress can directly promote the secretion of growth factors or promote the secretion of hormones with growth-promoting effects in the body, indirectly promoting cell growth. Transforming growth factor is a growth factor with a relatively high content in osteoblasts and can regulate the proliferation and differentiation of osteoblasts. On the other hand, it promotes the synthesis of synthetic collagen fibronectin, and promotes osteoblasts to synthesize type I collagen, fibronectin, osteonectin, and proteoglycans.

[0005] Regarding the mode, timing, type, magnitude, etc. of stress action, current research believes that: Intermittent stress stimulation can stimulate osteoblast activity more effectively than continuous stress stimulation; it is considered that the early stage of bone healing is the most effective period for mechanical factors to promote bone healing. When the fracture heals and restores the original structure and hardness, mechanical factors are the only factors for bone remodeling. Appropriate stress and strain should be ensured between the fracture ends in the early stage of bone healing. In the early stage of bone healing, the compressive stress generated by axial loading can drive osteoblasts and fibroblasts to differentiate into the osteogenic direction, which is beneficial to bone healing. Shear and torsional loads generate shear stress, which is likely to cause dynamic friction at the fracture ends, cause greater damage to the formed capillaries and callus, and drive the proliferation of fibroblasts to produce fibrous tissue, which is not conducive to bone healing. In the middle and late stages of bone healing, various stresses have a certain promoting effect on the formation and remodeling of callus; Bone healing requires an appropriate biomechanical environment or the optimal stress level. Only when the stress level at the fracture ends is balanced and coordinated with the tissue stiffness in the healing area can the tissue differentiate and heal well. If the stress is too large and exceeds the tissue's bearing capacity, the living bone will undergo reactive surface absorption at the bone-bone interface or the bone-implant interface, reducing the pressure at the fracture ends, leading to bone atrophy, and the greater the pressure, the more rapid the reduction of the pressure at the fracture ends. On the contrary, if it is not enough to cause elastic deformation, the mechanical induction of tissue differentiation is reduced and difficult to occur, which may lead to delayed bone healing and nonunion. Generally, it is considered that the compressive stress at the fracture ends should not exceed the physiological body weight.

[0006] Regarding micromotion and fracture healing: Micromotion at the fracture ends is closely related to stress. According to Wollf's law and many recent studies, controllable and appropriate microkinetics at the fracture ends can promote the formation and calcification of callus and accelerate fracture healing. Regarding the frequency, timing, amount, etc. of micromotion, current research believes that: Low-frequency axial micromotion is beneficial to fracture healing. Controllable microkinetics in the early stage can promote fracture healing, while micromotion generated in the late stage (4 - 6 weeks) is likely to damage the vascular network at the fracture site and delay fracture healing. Summary of the Invention

[0007] The object of the present invention is to make up for the defects existing in the treatment of limb fractures with the currently used external fixation brackets, and to provide a combined external fixation bracket and an adjustable pressure fixation device with adjustable pressure, firm fixation, simple operation and easy adjustment, which can effectively prevent stress shielding, avoid osteoporosis and accelerate fracture healing.

[0008] The present invention adopts the following technical solutions:

[0009] An adjustable pressure fixation device for orthopedic clinical application, the adjustable pressure fixation device comprising: an adjusting rod, a sliding mating nut, an elastic device, a fixing rod and a fixing structure for fixing the adjusting rod, wherein,

[0010] The adjusting rod is a cylindrical rod with a hollow structure, the fixing rod is a cylindrical rod, the sliding mating nut is a cylindrical sleeve, and the upper part is provided with a thickened part of the cylindrical wall. The inner diameter of the sliding mating nut is adapted to the outer diameters of the adjusting rod and the fixing rod. The upper part of the sliding mating nut sleeves the lower part of the adjusting rod, and the lower part of the sliding mating nut sleeves the upper part of the fixing rod; wherein,

[0011] The adjusting rod can be slightly adjusted axially relative to the sliding mating nut, but cannot rotate relatively;

[0012] The fixing rod is fixed relative to the sliding mating nut;

[0013] The elastic device provides an elastic force during the axial up and down micro-adjustment of the adjusting rod;

[0014] The fixing structure of the adjusting rod is used to fix the adjusting rod and limit the axial sliding of the adjusting rod;

[0015] The head ends of the adjusting rod and the fixing rod can be set in other structural forms to be connected with a ring or other needle-fixing structures.

[0016] Furthermore, the specific connection manner between the adjusting rod and the sliding mating nut is one of the following manners:

[0017] (a), the lower part of the adjusting rod is provided with anti-rotation pin holes penetrating through both sides, and the axial height of the anti-rotation pin holes is slightly greater than the transverse width; the upper part of the sliding mating nut is provided with anti-rotation holes penetrating through both sides in the radial direction, and the aperture of the anti-rotation holes is adapted to the transverse width of the anti-rotation pin holes; the anti-rotation pin penetrates through the anti-rotation holes of the sliding mating nut and the anti-rotation pin holes at the lower part of the adjusting rod in the radial direction, and the diameter of the anti-rotation pin is adapted to the aperture of the anti-rotation holes;

[0018] (b) On the lower part of the adjusting rod, anti-rotation pin holes that penetrate both sides are provided. The axial length of the anti-rotation pin holes is slightly greater than the transverse width; on the upper part of the sliding fit nut, anti-rotation holes that penetrate both sides radially are provided. The diameter of the anti-rotation holes is adapted to the transverse width of the anti-rotation pin holes; two cylindrical key pins of the same size, one of the cylindrical key pins is inserted into one side of the anti-rotation hole and the anti-rotation pin hole, and the other cylindrical key pin is inserted into the other side of the anti-rotation hole and the anti-rotation pin hole. The diameter of the cylindrical key pin is adapted to the aperture of the anti-rotation hole;

[0019] (c) On the lower part of the adjusting rod, anti-rotation pin holes that penetrate both sides are provided. The axial length of the anti-rotation pin holes is slightly greater than the transverse width; on the upper part of the sliding fit nut, anti-rotation holes that penetrate both sides radially are provided. The diameter of the anti-rotation holes is adapted to the transverse width of the anti-rotation pin holes; a cylindrical key pin is inserted into one side of the anti-rotation hole and the anti-rotation pin hole. The diameter of the cylindrical key pin is adapted to the aperture of the anti-rotation hole;

[0020] (d) By providing a guiding flat key for sliding and anti-rotation, key grooves corresponding to the guiding flat key are provided on the inner wall of the upper part of the sliding fit nut and the outer wall of the lower part of the adjusting rod. The guiding flat key groove provided on the outer wall of the lower part of the adjusting rod is slightly longer than the guiding flat key. The guiding flat key and the sliding fit nut are fixedly connected by a fixing key pin;

[0021] (e) At the lower end of the adjusting rod, a cylindrical outer diameter enlarged part is provided. An anti-rotation plane is provided on the outer diameter of the enlarged part. The upper barrel mouth of the sliding fit nut is set to be smaller than the inner diameter of the barrel body. The upper barrel mouth is slidably connected to the adjusting rod. A convex plane is provided on the inner wall of the upper part of the sliding fit nut and slidably cooperates with the plane provided at the lower end of the adjusting rod;

[0022] (f) The upper barrel mouth of the sliding fit nut is set to be smaller than the inner diameter of the barrel body. The upper barrel mouth is slidably connected to the adjusting rod. A convex plane is provided on the inner wall of the upper part of the sliding fit nut. An anti-disengagement sleeve is provided at the lower end of the adjusting rod, which is in the shape of a cylindrical barrel. The anti-disengagement sleeve and the adjusting rod are fixedly connected by a fastening pin. A plane is provided on the outer wall of the anti-disengagement sleeve and cooperates with the plane provided on the inner wall of the upper part of the sliding fit nut;

[0023] (g) The upper barrel mouth of the sliding fit nut is set to be smaller than the inner diameter of the barrel body. The upper barrel mouth is slidably connected to the adjusting rod. A convex plane is provided on the inner wall of the upper part of the sliding fit nut. An anti-disengagement sleeve is provided at the lower end of the adjusting rod, which is in the shape of a cylindrical barrel. The anti-disengagement sleeve and the adjusting rod are fixedly connected by a fastening set screw. A plane is provided on the outer wall of the anti-disengagement sleeve and cooperates with the plane provided on the inner wall of the upper part of the sliding fit nut.

[0024] Further, the sliding fit nut is provided as a split type. The upper part of the sliding fit nut is slidably connected to the lower part of the adjusting rod. The lower part of the sliding fit nut is fixedly connected to the upper part of the fixed rod. The lower end of the upper part of the sliding fit nut and the upper end of the lower part are fixedly connected by a connecting pin.

[0025] Further, a fixing structure for fixing the adjusting rod is provided to limit the axial sliding of the adjusting rod; its specific structure is one of the following methods:

[0026] (a). A fastening nut is provided on the outer wall of the adjusting rod at the upper end of the sliding fit bushing. The inner wall of the fastening nut is provided with threads and is threadedly connected to the adjusting rod. By adjusting the fastening nut downward, its lower end abuts against the upper end of the sliding fit bushing, and the adjusting rod can be fixed.

[0027] (b). A fastening set screw hole that penetrates radially on one side is provided in the upper part of the sliding fit bushing, and the fastening set screw can be screwed in and abutted against the outer wall of the adjusting rod.

[0028] (c). A limiting sleeve is provided on the outer wall of the adjusting rod at the upper end of the sliding fit bushing, and the limiting sleeve and the adjusting rod are tightly connected by a fastening set screw.

[0029] (d). A limiting clamping block is provided on the outer wall of the adjusting rod at the upper end of the sliding fit bushing. One end of the limiting clamping block is axially provided with a round hole that slidably cooperates with the adjusting rod, and the other end is provided with a 2-mm-high gap communicating with the round hole and a fastening screw in the middle. A threaded hole is provided on the limiting clamping block at the head end of the fastening screw, and by screwing the fastening screw tightly, the limiting clamping block can be fixed to the adjusting rod.

[0030] (e). A limiting pin is provided on the adjusting rod at the upper end of the sliding fit bushing, and the limiting pin and the adjusting rod are tightly connected. A limiting nut is provided at the upper end of the sliding fit bushing. The inner wall of the limiting nut is threadedly connected to the upper end of the sliding fit bushing, and the upper port of the limiting nut is slidably connected to the adjusting rod.

[0031] Furthermore, the specific connection method between the sliding fit bushing and the fixed rod is one of the following methods:

[0032] (a). The upper part of the fixed rod and the lower part of the sliding fit bushing are tightly connected by a fastening set screw.

[0033] (b). The upper part of the fixed rod and the lower part of the sliding fit bushing are tightly connected by a fastening pin.

[0034] (c). The upper end of the fixed rod is threadedly connected to the lower part of the sliding fit bushing, and the fixed rod is fastened by a fastening nut.

[0035] (d). The fixed rod and the sliding fit bushing are integrally formed. The upper part of the fixed rod is provided with a cylindrical diameter-increased part, presenting a cylindrical structure.

[0036] (e). A fixed nut is provided on the outer wall of the lower part of the sliding fit bushing and is tightly connected to the sliding fit bushing by a fixed pin. The fixed nut is radially provided with a fastening screw, and the fastening screw is threadedly connected to the fixed nut and the lower part of the sliding fit bushing. Its head end corresponds to the step provided on the side surface of the upper end of the fixed rod to fix the fixed rod; the fixed rod is configured to slidably cooperate with the lower part of the sliding fit bushing and the lower part of the fastening nut. Two radially penetrating pin holes are provided at different axial heights of the fixed rod. After two clamping tube pins radially penetrate the pin holes of the fixed rod, they respectively cooperate with the upper and lower step parts of the fastening nut and the lower end of the fastening nut, and the fixed rod can be driven to move up and down as the fastening nut moves up and down.

[0037] (f) A cylindrically shaped thickened part of the outer wall is provided at the lower part of the sliding fit sleeve. A fastening screw is arranged radially. The fastening screw is threadedly connected to the lower part of the sliding fit sleeve, and its head end corresponds to the step provided on the side surface of the upper end of the fixing rod to fix the fixing rod. The fixing rod is configured to be slidably fitted with the lower part of the sliding fit sleeve and the lower part of the fastening nut. Two radially penetrating pin holes are provided at different axial heights of the fixing rod. After two clamping tube pins radially penetrate the pin holes of the fixing rod, they are respectively fitted with the upper and lower step parts of the fastening nut and the lower end of the fastening nut, and can drive the fixing rod to move up and down as the fastening nut moves up and down.

[0038] (g) A threaded gasket, a fixing rod screw, and a fixing rod screw sliding hole are provided on the outer wall of the lower part of the sliding fit sleeve. The inner wall of the threaded gasket is provided with threads and a circular hole is provided radially. It is threadedly connected to the lower part of the sliding fit sleeve. The fixing rod screw radially penetrates the circular hole of the threaded gasket, and the head end of the fixing rod screw is threadedly connected to the upper part of the fixing rod. The axial diameter length of the fixing rod screw sliding hole is greater than the transverse diameter. The fixing rod is configured to be slidably fitted with the lower part of the sliding fit sleeve and the lower part of the fastening nut. Two radially penetrating pin holes are provided at different axial heights of the fixing rod. After two clamping tube pins radially penetrate the pin holes of the fixing rod, they are respectively fitted with the upper and lower step parts of the fastening nut and the lower end of the fastening nut, and can drive the fixing rod to move up and down as the fastening nut moves up and down.

[0039] (h) A threaded gasket, a fixing rod screw, a fixing rod screw sliding hole, and an adjusting nut are provided on the outer wall of the lower part of the sliding fit sleeve. The inner wall of the threaded gasket is provided with threads and a circular hole is provided radially. It is threadedly connected to the lower part of the sliding fit sleeve. The fixing rod screw radially penetrates the circular hole of the threaded gasket, and the head end of the fixing rod screw is threadedly connected to the upper part of the fixing rod. The axial diameter length of the fixing rod screw sliding hole is greater than the transverse diameter. The adjusting nut is threadedly connected to the lower part of the sliding fit sleeve and is provided below the threaded gasket. The fixing rod is configured to be slidably fitted with the lower part of the sliding fit sleeve, and a screw hole adapted to the fixing rod screw is provided radially at the upper end.

[0040] (i) A connecting sleeve is provided on the outer wall of the lower part of the sliding fit sleeve. After being threadedly connected to the sliding fit sleeve, it is fixedly connected with a fixing pin. The connecting sleeve is provided with a fastening screw radially. The head end of the fastening screw corresponds to the step provided on the side surface of the upper end of the fixing rod to fix the fixing rod. The fixing rod is configured to be slidably fitted with the lower part of the sliding fit sleeve, the lower part of the connecting sleeve, and the lower part of the fastening nut. Two radially penetrating pin holes are provided at different axial heights of the fixing rod. After two clamping tube pins radially penetrate the pin holes of the fixing rod, they are respectively fitted with the upper and lower step parts of the fastening nut and the lower end of the fastening nut, and can drive the fixing rod to move up and down as the fastening nut moves up and down.

[0041] (j) A positioning nut and an adjusting nut are provided on the outer wall of the lower part of the sliding fit bushing. The positioning nut has a sliding hole for a fixing rod pin that penetrates through both sides in the radial direction. The axial length of the sliding hole for the fixing rod pin is greater than the transverse width. The fixing rod is configured to be in sliding fit with the lower part of the sliding fit bushing. A fixing rod pin is provided radially at the upper end. The two adjusting nuts are respectively located above and below the fixing rod pin and are threadedly connected to the lower part of the sliding fit bushing, and can drive the fixing rod pin and the fixing rod to move up and down.

[0042] Furthermore, a one-way pressure regulating device is provided on the sliding fit bushing body, and a pressure scale is provided on the outer wall of the sliding fit bushing. The specific structure of the one-way pressure regulating device is one of the following methods:

[0043] (a) The pressure regulating device includes a pressure regulating pin, a fixing sleeve, a limiting sleeve, and a pressure regulating nut. A pressure regulating pin hole that penetrates through both sides in the radial direction is provided on the sliding fit bushing. The axial length of the pressure regulating pin hole is greater than the transverse width. The fixing sleeve is slidably sleeved on the outer wall of the sliding fit bushing, and a through circular hole is provided radially on the fixing sleeve. The pressure regulating pin radially penetrates through the pressure regulating pin hole of the sliding fit bushing and the pressure regulating pin hole of the fixing sleeve, and the diameter of the pressure regulating pin is adapted to the aperture of the pressure regulating pin hole. The upper end of the limiting sleeve has a smaller inner diameter than the lower part and is located outside the fixing sleeve and is in interference fit with the fixing sleeve. The elastic device is a compression spring. The upper end of the compression spring abuts against the lower end of the adjusting rod, and the lower end of the compression spring abuts against the pressure regulating pin.

[0044] (b) The pressure regulating device includes a pressure regulating pin, a fixing sleeve, a limiting sleeve, and a pressure regulating nut. A pressure regulating pin hole that penetrates through both sides in the radial direction is provided on the sliding fit bushing. The axial length of the pressure regulating pin hole is greater than the transverse width. The fixing sleeve is slidably sleeved on the outer wall of the sliding fit bushing, and a through circular hole is provided radially on the fixing sleeve. The pressure regulating pin radially penetrates through the pressure regulating pin hole of the sliding fit bushing and the pressure regulating pin hole of the fixing sleeve, and the diameter of the pressure regulating pin is adapted to the aperture of the pressure regulating pin hole. The upper end of the limiting sleeve has a smaller inner diameter than the lower part and is located outside the fixing sleeve and is in interference fit with the fixing sleeve. The elastic device is an elastic capsule, and an elastic capsule base is also provided. The upper end of the elastic capsule abuts against the lower end face of the adjusting rod cap provided at the lower end of the adjusting rod, and the lower end of the elastic capsule abuts against the elastic capsule base, and the elastic capsule base is placed on the pressure regulating pin.

[0045] (c), The pressure regulating device includes a pressure regulating pin, a fixed sleeve, a limit sleeve and a pressure regulating nut; the sliding sleeve has a pressure regulating pin hole that penetrates both sides radially, and the axial length of the pressure regulating pin hole is greater than the transverse width; the fixed sleeve is slidably sleeved on the outer wall of the sliding sleeve, and the fixed sleeve is provided with a through circular hole radially; the pressure regulating pin radially penetrates the pressure regulating pin hole of the sliding sleeve and the pressure regulating pin hole of the fixed sleeve, and the diameter of the pressure regulating pin is adapted to the diameter of the pressure regulating pin hole; the upper end of the limit sleeve is smaller than the inner diameter of the lower part, located outside the fixed sleeve, and is in interference fit with the fixed sleeve; the elastic device is composed of a compression spring, a pressure sensor and a pressure display. The upper end of the compression spring abuts against the lower end of the adjusting rod, the lower end of the compression spring abuts against the upper end of the pressure sensor, the lower end of the pressure sensor abuts against the pressure regulating pin, and the pressure sensor is connected to the pressure display through the pressure regulating pin hole;

[0046] (d), The pressure regulating device includes a pressure regulating pin, a fixed sleeve, a limit sleeve and a pressure regulating nut; the sliding sleeve has a pressure regulating pin hole that penetrates both sides radially, and the axial length of the pressure regulating pin hole is greater than the transverse width; the fixed sleeve is slidably sleeved on the outer wall of the sliding sleeve, and the fixed sleeve is provided with a through circular hole radially; the pressure regulating pin radially penetrates the pressure regulating pin hole of the sliding sleeve and the pressure regulating pin hole of the fixed sleeve, and the diameter of the pressure regulating pin is adapted to the diameter of the pressure regulating pin hole; the upper end of the limit sleeve is smaller than the inner diameter of the lower part, located outside the fixed sleeve, and is in interference fit with the fixed sleeve; the elastic device is composed of an elastic capsule and a pressure display, and an elastic capsule base is also provided. The upper end of the elastic capsule abuts against the lower end face of the adjusting rod cap provided at the lower end of the adjusting rod, the lower end of the elastic capsule abuts against the elastic capsule base, the elastic capsule base is placed on the pressure regulating pin, and the elastic capsule is connected to the pressure display through the pressure regulating pin hole;

[0047] (e), The spring is located outside the wall of the sliding sleeve. A retaining spring pin and a pressure regulating pin are provided below the adjusting rod. The sliding sleeve is radially provided with long holes adapted to the retaining spring pin and the pressure regulating pin. The two ends of the retaining spring pin are respectively provided with a fixed sleeve and a limit sleeve, and the two ends of the pressure regulating pin are respectively provided with a fixed sleeve and a limit sleeve. The upper end of the retaining spring pin abuts against the lower end of the adjusting rod. The outer wall of the sliding sleeve is provided with threads, and a pressure regulating nut is provided on the outer wall of the sliding sleeve. The upper end of the pressure regulating nut abuts against the lower ends of the fixed sleeve and the limit sleeve. The spring is a compression spring sleeved outside the wall of the sliding sleeve, with the upper end abutting against the lower end of the fixed sleeve of the retaining spring pin and the lower end abutting against the upper end of the limit sleeve of the pressure regulating pin;

[0048] (f), The pressure regulating device includes a pressure regulating pin, a fixed sleeve, and a limit sleeve; a pressure regulating pin hole that penetrates both sides is radially provided on the sliding fit screw sleeve, and the axial length of the pressure regulating pin hole is greater than the transverse width; the fixed sleeve is slidably sleeved on the outer wall of the sliding fit screw sleeve, and a through circular hole is radially provided on the fixed sleeve; the pressure regulating pin radially penetrates the pressure regulating pin hole of the sliding fit screw sleeve and the pressure regulating pin hole of the fixed sleeve, the pressure regulating pin is in interference fit with the adjusting rod, the fixed sleeve is in interference fit with the pressure regulating pin, the inner diameter of the barrel mouth of the limit sleeve is smaller than the inner diameter of the lower part, and it is located outside the fixed sleeve and is in interference fit with the fixed sleeve, and the fixed sleeve, the limit sleeve and the sliding fit screw sleeve are slidably matched; the spring is a compression spring sleeved under the adjusting rod, the lower end abuts against the pressure regulating pin, the inner diameter of the upper barrel wall of the sliding fit screw sleeve is small, and the inner diameter of the lower barrel wall is large, and the upper end of the spring abuts against the step provided on the inner wall of the sliding fit screw sleeve in the natural state;

[0049] (g), The pressure regulating device includes a pressure regulating pin, a fixed sleeve, and a limit sleeve; a pressure regulating pin hole that penetrates both sides is radially provided on the sliding fit screw sleeve, and the axial length of the pressure regulating pin hole is greater than the transverse width; the fixed sleeve is slidably sleeved on the outer wall of the sliding fit screw sleeve, and a through circular hole is radially provided on the fixed sleeve; the pressure regulating pin radially penetrates the pressure regulating pin hole of the sliding fit screw sleeve and the pressure regulating pin hole of the fixed sleeve, the pressure regulating pin is in interference fit with the adjusting rod, an anti-rotation pin and an anti-rotation pin hole are provided below the adjusting rod, the spring is a compression spring sleeved under the adjusting rod, the lower end abuts against the pressure regulating pin, the inner diameter of the upper barrel wall of the sliding fit screw sleeve is small, and the inner diameter of the lower barrel wall is large, and the upper end of the spring abuts against the step provided on the inner wall of the sliding fit screw sleeve in the natural state;

[0050] (h), The pressure regulating device includes a pressure regulating pin, a fixed sleeve and a limit sleeve, a pressure regulating pin hole that penetrates both sides is radially provided on the sliding fit screw sleeve, and the axial length of the pressure regulating pin hole is greater than the transverse width; the fixed sleeve is slidably sleeved on the outer wall of the sliding fit screw sleeve, and a through circular hole is radially provided on the fixed sleeve; the pressure regulating pin radially penetrates the pressure regulating pin hole of the sliding fit screw sleeve and the pressure regulating pin hole of the fixed sleeve, the pressure regulating pin is in interference fit with the adjusting rod, no anti-rotation pin and anti-rotation pin hole are provided below the adjusting rod, the spring is a compression spring sleeved on the outer wall of the sliding fit screw sleeve, the lower end abuts against the pressure regulating pin, the sliding fit screw sleeve is provided with a large outer diameter of the upper barrel wall and a small outer diameter of the lower barrel wall, and the upper end of the spring abuts against the step provided on the outer wall of the sliding fit screw sleeve in the natural state.

[0051] (i) The elastic device can be set as a tension spring, which is located inside the wall of the sliding fit screw sleeve and is slidably connected to the sliding fit screw sleeve. An anti-rotation pin is provided at the lower part of the adjusting rod, and the adjusting rod is tightly fitted with the anti-rotation pin. A long groove adapted to the upper part of the tension spring is axially provided at the lower end of the adjusting rod. Fixed sleeves and limit sleeves are provided at both ends of the anti-rotation pin, and the fixed sleeves and limit sleeves are slidably connected to the sliding fit screw sleeve. An adjusting nut is provided below the anti-rotation pin, and the adjusting nut is threadedly connected to the sliding fit screw sleeve. An anti-rotation pin hole adapted to the anti-rotation pin is provided on the wall of the sliding fit screw sleeve, and the axial length is greater than the radial length. Rotating the adjusting nut upward can push the fixed sleeve, limit sleeve, anti-rotation pin, and adjusting rod to move upward as a whole. Circular hooks are provided at the upper and lower ends of the tension spring. The upper hook is sleeved on the anti-rotation pin, and the lower hook is sleeved on the pressure regulating pin. Fixed sleeves and limit sleeves are provided at both ends of the pressure regulating pin, and the fixed sleeves and limit sleeves are slidably connected to the sliding fit screw sleeve. A pressure regulating nut is provided above the limit sleeve, and the lower part of the pressure regulating nut abuts against the fixed sleeve and limit sleeve. The pressure regulating nut is sleeved on the outer wall of the sliding fit screw sleeve, and the pressure regulating nut is threadedly connected to the sliding fit screw sleeve. A pressure regulating pin hole adapted to the pressure regulating pin is provided on the wall of the sliding fit screw sleeve, and the axial length is greater than the radial length. Rotating the pressure regulating nut downward can drive the fixed sleeve, limit sleeve, pressure regulating pin, and tension spring to move downward;

[0052] (j) The spring is located inside the wall of the sliding fit screw sleeve. The lower part of the adjusting rod axially penetrates the spring. Pressure regulating pins are provided at the lower part of the adjusting rod. Long holes adapted to the pressure regulating pins are radially provided at the lower part of the adjusting rod. The pressure regulating pins radially penetrate the adjusting rod and are tightly connected to the adjusting rod. Fixed sleeves and limit sleeves are respectively provided at both ends of the pressure regulating pins. Threads are provided on the outer wall of the sliding fit screw sleeve, and long holes adapted to the pressure regulating pins are radially provided. The inner diameter of the upper part of the sliding fit screw sleeve is larger than the inner diameter of the lower part of the sliding fit screw sleeve. The upper part of the fixed rod is a cylindrical diameter-varying part, which is slidably fitted with the inner wall of the lower part of the sliding fit screw sleeve. Pressure regulating nuts are provided on the outer wall of the sliding fit screw sleeve. The upper end of the pressure regulating nut abuts against the lower ends of the fixed sleeve and limit sleeve, and the lower end abuts against the upper ends of the fixed sleeve and limit sleeve;

[0053] (k) The spring is located outside the wall of the sliding fit screw sleeve. Pressure regulating pins are provided at the lower part of the adjusting rod. Long holes adapted to the pressure regulating pins are radially provided at the lower part of the adjusting rod. The pressure regulating pins radially penetrate the adjusting rod and are tightly connected to the adjusting rod. Fixed sleeves and limit sleeves are respectively provided at both ends of the pressure regulating pins. Threads are provided on the outer wall of the sliding fit screw sleeve, and long holes adapted to the pressure regulating pins are radially provided. Pressure regulating nuts are provided on the outer wall of the sliding fit screw sleeve. The upper end of the pressure regulating nut abuts against the lower ends of the fixed sleeve and limit sleeve, and the lower end of the pressure regulating nut abuts against the upper ends of the fixed sleeve and limit sleeve.

[0054] Furthermore, a two-way pressure regulating device is provided on the sliding fit screw sleeve body, and a pressure scale is provided on the outer wall of the sliding fit screw sleeve. The specific structure of the two-way pressure regulating device is one of the following methods:

[0055] (a) The spring is located inside the wall of the sliding fit screw sleeve. The lower part of the adjusting rod axially penetrates the spring. The lower part of the adjusting rod is radially provided with pressure regulating pins. Long holes adapted to the pressure regulating pins are respectively provided radially. The axial length is greater than the radial length. Fixed sleeves and limit sleeves are provided at both ends of the pressure regulating pins. Threads are provided on the outer wall of the sliding fit screw sleeve. Long holes adapted to the pressure regulating pins are provided radially. The inner diameter of the lower barrel wall of the sliding fit screw sleeve is larger than that of the upper barrel wall. Pressure regulating nuts are provided on the outer wall of the sliding fit screw sleeve. The upper end of the pressure regulating nut abuts against the lower ends of the fixed sleeve and the limit sleeve, and the lower end of the pressure regulating nut abuts against the upper ends of the fixed sleeve and the limit sleeve. A pressure scale is provided on the outer wall of the sliding fit screw sleeve;

[0056] (b) The spring is located outside the wall of the sliding fit screw sleeve. The lower part of the adjusting rod is radially provided with pressure regulating pins. Long holes adapted to the pressure regulating pins are respectively provided radially. Fixed sleeves and limit sleeves are provided at both ends of the pressure regulating pins. Threads are provided on the outer wall of the sliding fit screw sleeve. Long holes adapted to the pressure regulating pins are provided radially. Pressure regulating nuts are provided on the outer wall of the sliding fit screw sleeve. The upper end of the pressure regulating nut abuts against the lower ends of the fixed sleeve and the limit sleeve, and the lower end of the pressure regulating nut abuts against the upper ends of the fixed sleeve and the limit sleeve. A pressure scale is provided on the outer wall of the sliding fit screw sleeve:

[0057] (c) The elastic device is provided with 2 springs, which can regulate pressure in both upward and downward directions for the adjusting rod. The springs are located inside the wall of the sliding fit screw sleeve. The lower part of the adjusting rod axially penetrates the springs. The lower part of the adjusting rod is radially provided with pressure regulating pins and retaining spring pins. A long hole adapted to the pressure regulating pin is provided radially. Fixed sleeves and limit sleeves are provided at both ends of the pressure regulating pins. The retaining spring pin radially penetrates the adjusting rod and is fixedly connected to the adjusting rod. In the natural state, the upper end of the spring abuts against the pressure regulating pin, and the lower end abuts against the retaining spring pin. The springs are located inside the wall of the sliding fit screw sleeve. The pressure regulating pin radially penetrates the wall of the sliding fit screw sleeve, and fixed sleeves and limit sleeves are provided at both ends. In the natural state, the upper end of the spring abuts against the retaining spring pin, and the lower end abuts against the pressure regulating pin. Threads are provided on the outer wall of the sliding fit screw sleeve. Long holes adapted to the pressure regulating pins, retaining spring pins are provided radially. The inner diameter of the upper barrel wall of the sliding fit screw sleeve is larger than that of the lower barrel wall. The upper part of the fixed rod is a cylindrical diameter-varying part, which is slidably matched with the inner wall of the lower part of the sliding fit screw sleeve. Pressure regulating nuts are provided on the outer wall of the sliding fit screw sleeve. The upper end of the pressure regulating nut abuts against the lower ends of the fixed sleeve and the limit sleeve, and the lower end of the pressure regulating nut abuts against the upper ends of the fixed sleeve and the limit sleeve. A pressure scale is provided on the outer wall of the sliding fit screw sleeve;

[0058] (d), The elastic device is set as two springs, which can adjust the pressure in both upward and downward directions for the adjusting rod. The springs are located outside the wall of the sliding mating screw sleeve. The adjusting rod axially penetrates through the springs. Anti-rotation pins and retaining spring pins are radially provided at the lower part of the adjusting rod. A long hole adapted to the anti-rotation pin is radially provided on the adjusting rod, and the axial length is greater than the radial length. The anti-rotation pin is fixedly connected to the sliding mating screw sleeve. The retaining spring pin radially penetrates through the adjusting rod and is fixedly connected to the adjusting rod. A long hole adapted to the retaining spring pin is radially provided on the sliding mating screw sleeve, and the axial length is greater than the radial length. Pressure regulating nuts are provided outside the wall of the sliding mating screw sleeve and are threadedly connected to the sliding mating screw sleeve. In the natural state, the upper end of the spring abuts against the pressure regulating nut, and the lower end abuts against the retaining spring pin. The upper end of the other spring abuts against the retaining spring pin, and the lower end abuts against the pressure regulating nut. By rotating the upper pressure regulating nut upwards, the retaining spring pin can be driven to move upwards, giving an upward acting force to the adjusting rod. By rotating the lower pressure regulating nut downwards, the retaining spring pin can be driven to move downwards, giving a downward acting force to the adjusting rod; A pressure scale is provided on the outer wall of the sliding mating screw sleeve;

[0059] (e), The elastic device is set as two springs, which can adjust the pressure in both upward and downward directions for the adjusting rod. One spring is located above the sliding mating screw sleeve, and the adjusting rod axially penetrates through this spring. The other spring is located outside the wall of the sliding mating screw sleeve, and the sliding mating screw sleeve axially penetrates through this spring. A pressure regulating sleeve is provided at the upper end of the sliding mating screw sleeve. Its upper end is slidably connected to the adjusting rod, and the inner wall of the lower part has threads and is threadedly connected to the sliding mating screw sleeve. A fastening nut is provided on the adjusting rod and is threadedly connected to the adjusting rod to limit the sliding of the adjusting rod. The adjusting rod is radially provided with a pressure regulating pin, an anti-rotation pin, and a retaining spring pin from top to bottom. A long hole adapted to the anti-rotation pin is radially provided on the adjusting rod, and the axial length is greater than the radial length. The anti-rotation pin is fixedly connected to the sliding mating screw sleeve. The pressure regulating pin and the retaining spring pin are fixedly connected to the adjusting rod. A long hole adapted to the retaining spring pin is radially provided on the sliding mating screw sleeve, and the axial length is greater than the radial length. A pressure regulating nut is provided outside the wall of the sliding mating screw sleeve and is threadedly connected to the sliding mating screw sleeve. In the natural state, the upper end of one spring abuts against the pressure regulating sleeve, and the lower end abuts against the pressure regulating pin. The upper end of the other spring abuts against the retaining spring pin, and the lower end abuts against the pressure regulating nut; A pressure scale is provided on the outer wall of the sliding mating screw sleeve;

[0060] (f), The elastic device is set as two springs, which can adjust the pressure in both upward and downward directions for the adjusting rod. Both springs are located above the sliding mating screw sleeve, and the adjusting rod axially penetrates through the springs. A pressure regulating sleeve is provided at the upper end of the sliding mating screw sleeve. Its upper end is slidably connected to the adjusting rod, and the inner wall of the lower part has threads and is threadedly connected to the sliding mating screw sleeve. The outer wall of the pressure regulating sleeve has threads, and an upper pressure regulating sleeve is provided at the upper part. The upper pressure regulating sleeve is threadedly connected to the pressure regulating sleeve. The adjusting rod is radially provided with a retaining spring pin and an anti-rotation pin. The retaining spring pin is fixedly connected to the adjusting rod. A long hole adapted to the anti-rotation pin is radially provided on the adjusting rod, and the anti-rotation pin is fixedly connected to the sliding mating screw sleeve. In the natural state, the upper end of one spring abuts against the pressure regulating sleeve, and the lower end abuts against the retaining spring pin. The upper end of the other spring abuts against the retaining spring pin, and the lower end abuts against the pressure regulating sleeve; Pressure scales are provided on the outer wall of the sliding mating screw sleeve and the outer wall of the pressure regulating sleeve;

[0061] (g) The elastic device can be set as two springs, which can provide pressure regulation in both upward and downward directions to the adjusting rod. The springs are located outside the wall of the sliding and mating screw sleeve, and the tension spring is located inside the wall of the sliding and mating screw sleeve. A long groove adapted to the upper part of the tension spring is axially provided at the lower end of the adjusting rod. Anti-rotation pins and pressure-regulating pins are radially provided at the lower part of the adjusting rod. The adjusting rod is fixedly connected to the anti-rotation pins and the pressure-regulating pins. The pressure-regulating pin is radially provided in the sliding and mating screw sleeve. Long holes adapted to the anti-rotation pins, the pressure-regulating pins, and the pressure-regulating pins are radially provided on the wall of the sliding and mating screw sleeve, and the axial length is greater than the radial length. Fixed sleeves and limit sleeves are provided at both ends of the pressure-regulating pin. Circular hooks are provided at the upper and lower ends of the tension spring. The upper hook is sleeved on the pressure-regulating pin, and the lower hook is sleeved on the pressure-regulating pin. In the natural state, the upper end of the spring abuts against the anti-rotation pin, and the lower end abuts against above the fixed sleeve and the limit sleeve. A pressure-regulating nut is provided below the pressure-regulating pin. The pressure-regulating nut is threadedly connected to the sliding and mating screw sleeve. The lower part of the pressure-regulating nut abuts against the fixed sleeve and the limit sleeve. The pressure-regulating nut is sleeved on the outer wall of the sliding and mating screw sleeve, and a pressure scale is provided on the outer wall of the sliding and mating screw sleeve.

[0062] A combined external fixator with adjustable pressure for orthopedic clinical applications uses one of the above-mentioned adjustable pressure fixing devices and is combined with a rod needle clamp block or a rod needle clamp block, a rod rod clamp block, and a fixed rod to form a single-arm combined external fixator with adjustable pressure.

[0063] A combined external fixator with adjustable pressure for orthopedic clinical applications uses two of the above-mentioned adjustable pressure fixing devices and is combined with two half-rings, a rod rod clamp block, a rod needle clamp block, and a fixed rod to form a half-ring combined external fixator with adjustable pressure.

[0064] A combined external fixator with adjustable pressure for orthopedic clinical applications uses three or four of the above-mentioned adjustable pressure fixing devices and is combined with four or five circular rings or 2 / 3 circular rings, threaded rods, fixed nuts, needle-fixing screws, threaded columns, and fastening bolts to form a ring-type combined external fixator with adjustable pressure.

[0065] The present invention first provides an improved adjustable pressure fixing device. The beneficial effects of the present invention are as follows:

[0066] First, compared with the original fixed rod, the adjustable pressure fixing device of the present invention is almost completely redesigned in terms of the main structure, changing from the original simple connecting rod to a combination of an adjusting rod, a sliding screw sleeve, an elastic device, a unidirectional and bidirectional pressure regulating device, and a fixed rod. This micro-motion device can reduce the stress shielding of the external fixator and avoid osteoporosis.

[0067] Second, the bidirectional pressure regulating device is more precise and can achieve upward or downward pressure regulation according to the specific conditions of the patient, thus facilitating and effectively realizing the advantage of pressure regulation;

[0068] Finally, the fixing structure of the fixing rod and the adjusting rod makes the fixation of the fixing rod and the adjusting rod more firm.

[0069] In summary, when using the adjustable pressure fixing device of the present invention for fixation, under axial pressure on the bone, through the bone screws on the bone, the upper and lower ends of the adjusting rod and the fixing rod, the adjusting rod is forced to move downward and press, compressing the elastic capsule or spring. Since the adjusting rod can move slightly downward, it drives and controls the fractured bone to also conduct stress accordingly. Under the action of the stress at the fracture end, it can stimulate the formation of callus at the fracture end and avoid stress shielding at the fracture end. When the fractured bone is subjected to axial stress, it can stimulate the formation of callus at the fracture end, avoid the formation of osteoporosis caused by stress shielding of the external fixator, accelerate the fracture healing speed, and increase the strength of the healed bone. Brief Description of the Drawings

[0070] The description of the drawings is as follows

[0071] Figure 1 Schematic diagram of the type I structure of the adjustable pressure fixing device, the adjusting rod, and the sliding fit nut connection structure type I structure, the structure for restricting the sliding of the adjusting rod type I structure, the fixing rod, and the sliding fit nut connection structure type I structure

[0072] Figure 2 Schematic diagram of the type II structure of the adjusting rod and the sliding fit nut connection structure of the adjustable pressure fixing device

[0073] Figure 3 Schematic diagram of the type III structure of the adjusting rod and the sliding fit nut connection structure of the adjustable pressure fixing device

[0074] Figure 4 Schematic diagram of the type IV structure of the adjusting rod and the sliding fit nut connection structure of the adjustable pressure fixing device

[0075] Figure 5 Schematic diagram of the type V structure of the adjusting rod and the sliding fit nut connection structure of the adjustable pressure fixing device

[0076] Figure 6 Schematic diagram of the type VI structure of the adjusting rod and the sliding fit nut connection structure of the adjustable pressure fixing device

[0077] Figure 7 Schematic diagram of the type VII structure of the adjusting rod and the sliding fit nut connection structure of the adjustable pressure fixing device

[0078] Figure 8 Schematic diagram of the upper and lower split structure of the sliding fit nut of the adjustable pressure fixing device

[0079] Figure 9 Type II structure of the structure for restricting the sliding of the adjusting rod of the adjustable pressure fixing device

[0080] Figure 10 Type III structure of the structure for restricting the sliding of the adjusting rod of the adjustable pressure fixing device

[0081] Figure 11 Adjustable pressure fixing device restricting sliding fixing structure of adjusting rod, type IV structure

[0082] Figure 12 Adjustable pressure fixing arm restricting sliding fixing structure of adjusting rod, type V structure

[0083] Figure 13 Schematic diagram of type II structure of the connecting structure between the fixing rod and the sliding mating nut of the adjustable pressure fixing device

[0084] Figure 14 Schematic diagram of type III structure of the connecting structure between the fixing rod and the sliding mating nut of the adjustable pressure fixing device

[0085] Figure 15 Schematic diagram of type IV structure of the connecting structure between the fixing rod and the sliding mating nut of the adjustable pressure fixing device

[0086] Figure 16 Schematic diagram of type V structure of the connecting structure between the fixing rod and the sliding mating nut of the adjustable pressure fixing device

[0087] Figure 17 Schematic diagram of type VI structure of the connecting structure between the fixing rod and the sliding mating nut of the adjustable pressure fixing device

[0088] Figure 18 Schematic diagram of type VII structure of the connecting structure between the fixing rod and the sliding mating nut of the adjustable pressure fixing device

[0089] Figure 19 Schematic diagram of type VIII structure of the connecting structure between the fixing rod and the sliding mating nut of the adjustable pressure fixing device

[0090] Figure 20 Schematic diagram of type IX structure of the connecting structure between the fixing rod and the sliding mating nut of the adjustable pressure fixing device

[0091] Figure 21 Schematic diagram of type X structure of the connecting structure between the fixing rod and the sliding mating nut of the adjustable pressure fixing device

[0092] Figure 22 Schematic diagram of type II structure of the pressure regulating device of the adjustable pressure fixing device

[0093] Figure 23 Schematic diagram of type III structure of the pressure regulating device of the adjustable pressure fixing device

[0094] Figure 24 Schematic diagram of type IV structure of the pressure regulating device of the adjustable pressure fixing device

[0095] Figure 25 Schematic diagram of type V structure of the pressure regulating device of the adjustable pressure fixing device

[0096] Figure 26Schematic diagram of the VI - type pressure - regulating device of the adjustable - pressure fixing device

[0097] Figure 27 Schematic diagram of the VII - type pressure - regulating device of the adjustable - pressure fixing device

[0098] Figure 28 Schematic diagram of the VIII - type pressure - regulating device of the adjustable - pressure fixing device

[0099] Figure 29 Schematic diagram of the IX - type pressure - regulating device of the adjustable - pressure fixing device

[0100] Figure 30 Schematic diagram of the X - type pressure - regulating device of the adjustable - pressure fixing device

[0101] Figure 31 Schematic diagram of the XI - type pressure - regulating device of the adjustable - pressure fixing device

[0102] Figure 32 Schematic diagram of the XII - type pressure - regulating device of the adjustable - pressure fixing device

[0103] Figure 33 Schematic diagram of the XIII - type pressure - regulating device of the adjustable - pressure fixing device

[0104] Figure 34 Schematic diagram of the XIV - type pressure - regulating device of the adjustable - pressure fixing device

[0105] Figure 35 Schematic diagram of the XV - type pressure - regulating device of the adjustable - pressure fixing device

[0106] Figure 36 Schematic diagram of the XVI - type pressure - regulating device of the adjustable - pressure fixing device

[0107] Figure 37 Schematic diagram of the XVII - type pressure - regulating device of the adjustable - pressure fixing device

[0108] Figure 38 Schematic diagram of the XVIII - type pressure - regulating device of the adjustable - pressure fixing device

[0109] Figure 39 Schematic diagram of the XIX - type pressure - regulating device of the adjustable - pressure fixing device

[0110] Figure 40 Schematic diagram of the single - arm type I of the combined external fixator with adjustable pressure

[0111] Figure 41 Schematic diagram of the semi - ring type I of the combined external fixator with adjustable pressure

[0112] Figure 42 Schematic diagram of the ring type I of the combined external fixator with adjustable pressure Specific embodiments

[0113] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the specification. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0114] This adjustable-pressure combined external fixator is divided into three combined forms: single-arm type, semi-ring type, and ring type. Among them,

[0115] One pressure-regulating fixed arm is combined with a rod needle clamp block or with a rod needle clamp block, a rod rod clamp block, and a fixed rod to form a single-arm type adjustable-pressure external fixation bracket;

[0116] Two pressure-regulating fixed arms are combined with two semi-rings, a rod rod clamp block, a rod needle clamp block, and a fixed rod to form a semi-ring type adjustable-pressure external fixation bracket

[0117] Three or four pressure-regulating fixed arms are combined with four or five rings or two-thirds rings, threaded rods, fixed nuts, needle-fixing screws, threaded columns, and fastening bolts to form a ring type adjustable-pressure external fixation bracket.

[0118] The adjustable pressure fixing device generally includes the following structures: adjusting rod (1), sliding mating screw sleeve (2), anti-rotation pin (3), spring (4), fastening set screw (5), fixed rod (6), fastening nut (7), anti-rotation key pin (8), guiding flat key (9), key fixing pin (10), anti-detachment sleeve (11), fastening pin (12), fastening set screw (13), fastening pin (14),

[0119] The lower part of the sliding fit screw sleeve (15), fastening set screw (16), limit sleeve (17), fastening set screw (18), fastening screw (19), limit clamping block (20), limit pin (21), limit screw sleeve (22), fastening pin (23), fastening nut (24), fixed screw sleeve (25), fastening nut (26), limit sleeve (27), fastening pin (28), threaded gasket (29), rod fixing screw (30), adjusting nut (31), fastening pin (32), connecting screw sleeve (33), adjusting nut (34), rod fixing pin (35), adjusting nut (36), limit sleeve (37), pressure regulating pin (38), fixed sleeve (39), pressure regulating nut (40), adjusting rod end cap (41), elastic capsule (42), elastic capsule base (43), pressure sensor (44), pressure display (45), pressure display (46), spring (47), limit sleeve (48), fixed sleeve (49), retaining spring pin (50), limit sleeve (51), fixed sleeve (52), anti-rotation pin (53), adjusting nut (54), pressure regulating nut (55), tension spring (56), pressure regulating pin (57), fixed sleeve (58), limit sleeve (59), pressure regulating nut (60), fixed sleeve (61), pressure regulating pin (62), limit sleeve (63), retaining spring pin (64), spring (65), spring (66), pressure regulating screw sleeve (67), pressure regulating pin (68), pressure regulating screw sleeve (69).

[0120] Among them, the adjusting rod (1) is a cylindrical hollow rod, and the fixed rods (6) are all cylindrical hollow rods or solid rods. An anti-rotation pin hole is radially provided at the lower part of the adjusting rod (1), and the axial length of the anti-rotation pin hole is greater than the radial length. A plane is provided at the upper part of the fixed rod (6), corresponding to the fastening set screw (5);

[0121] The sliding fit screw sleeve (2) is set with the same inner diameter in the upper and lower parts, and a thickened part of the cylindrical barrel wall is provided in the upper part. The inner wall of the upper part of the sliding fit screw sleeve (2) is in sliding fit with the outer wall of the lower part of the adjusting rod (1), and the inner wall of the lower part of the sliding fit screw sleeve (2) is in sliding fit with the outer wall of the upper part of the fixed rod (6). The elastic device is arranged between the adjusting rod (1) and the fixed rod (6); Among them,

[0122] An anti-rotation pin (3) is radially provided at the upper part of the sliding fit screw sleeve (2), which is adapted to the anti-rotation pin hole provided at the lower part of the adjusting rod (1) to prevent the adjusting rod (1) from rotating in the horizontal direction. A fastening set screw (5) is radially provided at the lower part of the sliding fit screw sleeve (2), and the fastening screw (5) is screwed in and abuts against the plane provided on the outer wall of the upper part of the fixed rod (6) to prevent the fixed rod (6) from rotating and moving up and down relative to the sliding fit screw sleeve (2);

[0123] As a further setting of the sliding connection device between the adjusting rod (1) and the sliding mating sleeve (2), the sliding connection between the adjusting rod (1) and the sliding mating sleeve (2) is set as follows: Two cylindrical key pins (8) are radially arranged on the pipe wall of the sliding mating sleeve (2) and are in sliding fit with the anti-rotation pin holes provided at the lower part of the adjusting rod (1);

[0124] As a further setting of the sliding connection device between the adjusting rod (1) and the sliding mating sleeve (2), the sliding connection between the adjusting rod (1) and the sliding mating sleeve (2) is set as follows: One cylindrical key pin (8) is radially arranged on the pipe wall of the sliding mating sleeve (2) and is in sliding fit with the anti-rotation pin holes provided at the lower part of the adjusting rod (1);

[0125] As a further setting of the sliding connection device between the adjusting rod (1) and the sliding mating sleeve (2), the sliding connection between the adjusting rod (1) and the sliding mating sleeve (2) is set as follows: For sliding and anti-rotation, a guiding flat key (9) is provided. Key grooves corresponding to the guiding flat key (9) are provided on the inner wall of the upper part of the sliding mating sleeve (2) and the outer wall of the lower part of the adjusting rod (1). The guiding flat key groove provided on the outer wall of the lower part of the adjusting rod (1) is slightly longer than the guiding flat key (9), and the guiding flat key (9) is fixedly connected with the sliding mating sleeve (2) by a fixing key pin (10);

[0126] As a further setting of the sliding connection device between the adjusting rod (1) and the sliding mating sleeve (2), the sliding connection between the adjusting rod (1) and the sliding mating sleeve (2) is set as follows: The lower end of the adjusting rod (1) is provided with a cylindrical outer diameter enlarged part, and an anti-rotation plane is provided on the outer diameter of the enlarged part. The upper barrel opening of the sliding mating sleeve (2) is set to be smaller than the inner diameter of the barrel body, and the upper barrel opening is in sliding connection with the adjusting rod (1). A raised plane is provided on the inner wall of the upper part of the sliding mating sleeve (2) and is in sliding fit with the plane provided at the lower end of the adjusting rod (1);

[0127] As a further setting of the sliding connection device between the adjusting rod (1) and the sliding mating sleeve (2), the sliding connection between the adjusting rod (1) and the sliding mating sleeve (2) is set as follows: A raised plane is provided on the inner wall of the upper part of the sliding mating sleeve (2). An anti-disengagement sleeve (11) is provided at the lower end of the adjusting rod (1), and the anti-disengagement sleeve (11) is fixedly connected with the adjusting rod (1) by a fixing pin (12). A plane is provided on the outer wall of the anti-disengagement sleeve (11) and is matched with the plane provided on the inner wall of the upper part of the sliding mating sleeve (2);

[0128] As a further setting of the sliding connection device between the adjusting rod (1) and the sliding mating sleeve (2), the sliding connection between the adjusting rod (1) and the sliding mating sleeve (2) is set as follows: A raised plane is provided on the inner wall of the upper part of the sliding mating sleeve (2). An anti-disengagement sleeve (11) is provided at the lower end of the adjusting rod (1), and the anti-disengagement sleeve (11) is fixedly connected with the adjusting rod (1) by a fixing set screw (13). A plane is provided on the outer wall of the anti-disengagement sleeve (11) and is matched with the plane provided on the inner wall of the upper part of the sliding mating sleeve (2);

[0129] As a further setting of the sliding fit sleeve (2), the sliding fit sleeve (2) is provided as a split type. The upper part (2) of the sliding fit sleeve is slidably connected to the lower part of the adjusting rod (1), and the lower part (15) of the sliding fit sleeve is fixedly connected to the upper part of the fixed rod (6). The lower end of the upper part (2) of the sliding fit sleeve is fixedly connected to the upper end of the lower part (15) of the sliding fit sleeve by a connecting pin (14).

[0130] The fixing structure for fixing the adjusting rod (1) restricts the axial movement of the adjusting rod (1). A fastening nut (7) is provided on the outer wall of the adjusting rod (1) at the upper end of the sliding fit sleeve (2). The inner wall of the fastening nut (7) is provided with threads and is threadedly connected to the adjusting rod (1). By adjusting the fastening nut (7) downward, the lower end thereof abuts against the upper end of the sliding fit sleeve (2), and the adjusting rod (1) can be fixed.

[0131] As a further improvement of the fixing structure for fixing the adjusting rod (1), the fixing structure is provided as follows: a fastening setscrew (16) is provided on the side wall of the upper part of the sliding fit sleeve (2), which is threadedly connected to the side wall of the sliding fit sleeve (2) and is screwed in to abut against the outer wall of the adjusting rod (1) to restrict the sliding of the adjusting rod (1);

[0132] As a further improvement of the fixing structure for fixing the adjusting rod (1), the fixing structure is provided as follows: a limiting sleeve (17) is provided on the outer wall of the adjusting rod (1) at the upper end of the sliding fit sleeve (2), and the limiting sleeve (17) is fixedly connected to the adjusting rod (1) by a fastening setscrew (18);

[0133] As a further improvement of the fixing structure for fixing the adjusting rod (1), the fixing structure is provided as follows: a limiting clamp block (20) is provided on the outer wall of the adjusting rod (1) at the upper end of the sliding fit sleeve (2). One end of the limiting clamp block (20) is axially provided with a round hole that slidably cooperates with the adjusting rod (1), and the other end is provided with a slit 2 mm high and communicating with the round hole and a fastening screw (19) in the middle. A threaded hole is provided on the limiting clamp block at the head end of the fastening screw (19), and by tightening the fastening screw (19), the limiting clamp block (20) can be fixed to the adjusting rod (1);

[0134] As a further improvement of the fixing structure for fixing the adjusting rod (1), the fixing structure is provided as follows: a limiting pin (21) is provided on the adjusting rod (1) at the upper end of the sliding fit sleeve (2), and the limiting pin (21) is fixedly connected to the adjusting rod (1). A limiting sleeve (22) is provided at the upper end of the sliding fit sleeve (2), the inner wall of the limiting sleeve (22) is threadedly connected to the upper end of the sliding fit sleeve (2), and the upper port of the limiting sleeve (22) is slidably connected to the adjusting rod (1);

[0135] The connection structure between the sliding fit sleeve (2) and the fixed rod (6) can be provided with a fastening setscrew (5) on the side wall of the lower part of the sliding fit sleeve (2), and the upper part of the fixed rod (6) is fixedly connected to the lower part of the sliding fit sleeve (2) by the fastening setscrew (5);

[0136] As a further improvement to the connection structure between the sliding fit bushing (2) and the fixed rod (6), the specific arrangement of the connection mechanism between the fixed rod (6) and the sliding fit bushing (2) is as follows: The upper part of the fixed rod (6) and the lower part of the sliding fit bushing (2) are tightly connected by a fastening pin (23);

[0137] As a further improvement to the connection structure between the sliding fit bushing (2) and the fixed rod (6), the specific arrangement of the connection mechanism between the fixed rod (6) and the sliding fit bushing (2) is as follows: External threads are provided on the outer wall of the upper end of the fixed rod (6), and it is threadedly connected with the sliding fit bushing (2), and the fixed rod (6) is fastened with a fastening nut (24);

[0138] As a further improvement to the connection structure between the sliding fit bushing (2) and the fixed rod (6), the specific arrangement of the connection mechanism between the fixed rod (6) and the sliding fit bushing (2) is as follows: The fixed rod (6) and the sliding fit bushing (2) are integrally formed, and a cylindrical diameter-increased part is provided on the upper part of the fixed rod (6), presenting a cylindrical structure;

[0139] As a further improvement to the connection structure between the sliding fit bushing (2) and the fixed rod (6), the specific arrangement of the connection mechanism between the fixed rod (6) and the sliding fit bushing (2) is as follows: A fixed bushing (25) is provided on the outer wall of the lower part of the sliding fit bushing (2), and it is tightly connected with the sliding fit bushing (2) by a fixing pin (28). A fastening setscrew (5) is radially arranged on the side wall of the fixed bushing (25), and the fastening setscrew (5) is threadedly connected with the fixed bushing (25) and the lower part of the sliding fit bushing (2). The head end thereof corresponds to the step provided on the side surface of the upper end of the fixed rod (6) to fix the fixed rod (6); The fixed rod (6) is arranged to be in sliding fit with the lower part of the sliding fit bushing (2) and the lower part of the fastening nut (26). Two radially penetrating pin holes are provided at different axial heights of the fixed rod (6). After two clamping tube pins (27) radially penetrate the said pin holes of the fixed rod (6), they are respectively engaged with the upper and lower step parts of the fastening nut (26) and the lower end of the fastening nut (26), and can drive the fixed rod (6) to move up and down along with the up and down movement of the fastening nut (26);

[0140] As a further improvement to the connection structure between the sliding fit bushing (2) and the fixed rod (6), the specific arrangement of the connection mechanism between the fixed rod (6) and the sliding fit bushing (2) is as follows: A cylindrically shaped thickened part of the barrel wall is provided on the outer wall of the lower part of the sliding fit bushing (2), and a fastening setscrew (5) is radially provided on the side wall. The fastening setscrew (5) is threadedly connected to the lower part of the sliding fit bushing (2), and its head end corresponds to the step provided on the side of the upper end of the fixed rod (6) to fix the fixed rod (6); The fixed rod (6) is configured to be slidably fitted with the lower part of the sliding fit bushing (2) and the lower part of the fastening nut (26). Two radially penetrating pin holes are provided at different axial heights of the fixed rod (6). After two clamping tube pins (27) radially penetrate the said pin holes of the fixed rod (6), they respectively cooperate with the upper and lower step parts of the fastening nut (26) and the lower end of the fastening nut (26), and can drive the fixed rod (6) to move up and down as the fastening nut (26) moves up and down;

[0141] As a further improvement to the connection structure between the sliding fit bushing (2) and the fixed rod (6), the specific arrangement of the connection mechanism between the fixed rod (6) and the sliding fit bushing (2) is as follows: A threaded gasket (29), a fixed rod screw (30), and a sliding hole for the fixed rod screw are provided on the outer wall of the lower part of the sliding fit bushing (2). The inner wall of the threaded gasket (029) is provided with threads and a circular hole is provided radially. It is threadedly connected to the lower part of the sliding fit bushing (2). The fixed rod screw (30) radially penetrates the circular hole of the threaded gasket (29), and the head end of the fixed rod screw (30) is threadedly connected to the upper part of the fixed rod (6). The axial diameter length of the sliding hole for the fixed rod screw is greater than the transverse diameter; The fixed rod (6) is configured to be slidably fitted with the lower part of the sliding fit bushing (2) and the lower part of the fastening nut (26). Two radially penetrating pin holes are provided at different axial heights of the fixed rod (6). After two clamping tube pins (27) radially penetrate the said pin holes of the fixed rod (6), they respectively cooperate with the upper and lower step parts of the fastening nut (26) and the lower end of the fastening nut (26), and can drive the fixed rod (6) to move up and down as the fastening nut (26) moves up and down;

[0142] As a further improvement to the connection structure between the sliding fit bushing (2) and the fixed rod (6), the specific arrangement of the connection mechanism between the fixed rod (6) and the sliding fit bushing (2) is as follows: A threaded gasket (29), a fixed rod screw (30), a sliding hole for the fixed rod screw, and an adjusting nut (31) are provided on the outer wall of the lower part of the sliding fit bushing (2). The inner wall of the threaded gasket (029) is provided with threads and a circular hole is provided radially. It is threadedly connected to the lower part of the sliding fit bushing (2). The fixed rod screw (30) radially penetrates the circular hole of the threaded gasket (29), and the head end of the fixed rod screw (30) is threadedly connected to the upper part of the fixed rod (6). The axial diameter length of the sliding hole for the fixed rod screw is greater than the transverse diameter; The fixed rod (6) is configured to be slidably fitted with the lower part of the sliding fit bushing (2). A screw hole adapted to the fixed rod screw (30) is radially provided at the upper end. The adjusting nut (31) is threadedly connected to the lower part of the sliding fit bushing (2) and is provided below the threaded gasket (29) and can drive the fixed rod (6) to move upward;

[0143] As a further improvement to the connection structure between the sliding fit bushing (2) and the fixed rod (6), the specific arrangement of the connection mechanism between the fixed rod (6) and the sliding fit bushing (2) is as follows: A connection bushing (33) is provided on the outer wall of the lower part of the sliding fit bushing (2). After being threadedly connected to the sliding fit bushing (2), it is tightly connected with a fixing pin (32). The connection bushing (33) is radially provided with a fastening setscrew (5). The head end of the fastening setscrew (5) corresponds to the step provided on the side of the upper end of the fixed rod (6) to fix the fixed rod (6); The fixed rod (6) is arranged to be in sliding fit with the lower part of the sliding fit bushing (2), the lower part of the connection bushing (33), and the lower part of the fastening nut (26). Two radially penetrating pin holes are provided at different axial heights of the fixed rod (6). After two clamping tube pins (27) radially penetrate the pin holes of the fixed rod (6), they are respectively fitted with the upper and lower step parts of the fastening nut (26) and the lower end of the fastening nut (26), and can drive the fixed rod (6) to move up and down along with the up and down movement of the fastening nut (26);

[0144] As a further improvement to the connection structure between the sliding fit bushing (2) and the fixed rod (6), the specific arrangement of the connection mechanism between the fixed rod (6) and the sliding fit bushing (2) is as follows: Adjusting nuts (34) and (36) are provided on the outer wall of the lower part of the sliding fit bushing (2). Radially, there are sliding holes for the fixed rod pin that penetrate both sides. The axial length of the sliding holes for the fixed rod pin is greater than the transverse width. The fixed rod (6) is arranged to be in sliding fit with the lower part of the sliding fit bushing (2), and a fixed rod pin (35) is provided radially at the upper end. The adjusting nuts (34) and (36) are respectively located above and below the fixed rod pin (35) and are threadedly connected to the lower part of the sliding fit bushing (2), and can drive the fixed rod pin (35) and the fixed rod (6) to move up and down.

[0145] A pressure regulating device may be provided on the cylinder body of the sliding fit bushing (2). The specific arrangement of the pressure regulating device is as follows: A spring (4) is located inside the cylinder wall of the sliding fit bushing (2), with its upper end abutted below the lower end of the adjusting rod (1) and its lower end abutted against the upper end of the fixed rod (6);

[0146] Furthermore, a one-way pressure regulating device is provided on the cylinder body of the sliding fit bushing;

[0147] As a further improvement to the one-way pressure regulating device, the specific arrangement of the pressure regulating device is as follows: The pressure regulating device includes a pressure regulating pin (38), a fixed sleeve (39), a limit sleeve (37), and a pressure regulating nut (40); Radially, there are pressure regulating pin holes that penetrate both sides on the sliding fit bushing (2). The axial length of the pressure regulating pin holes is greater than the transverse width; The fixed sleeve (39) is slidably sleeved on the outer wall of the sliding fit bushing (2); The upper opening of the limit sleeve (37) is smaller than the inner diameter of the lower part. It is located outside the fixed sleeve (39) and is in interference fit with the fixed sleeve (39); The elastic device is a compression spring (4). The upper end of the compression spring (4) abuts against the lower end of the adjusting rod (1), and the lower end abuts against the pressure regulating pin (38);

[0148] As a further improvement of the one-way pressure regulating device, the specific setting of the pressure regulating device is as follows: The pressure regulating device includes a pressure regulating pin, a fixed sleeve, a limit sleeve and a pressure regulating nut; The pressure regulating device includes a pressure regulating pin (38), a fixed sleeve (39), a limit sleeve (37) and a pressure regulating nut (40); The sliding mating sleeve (2) is radially provided with a pressure regulating pin hole that penetrates through both sides, and the axial length of the pressure regulating pin hole is greater than the transverse width; The fixed sleeve (39) is slidably sleeved on the outer wall of the sliding mating sleeve (2); The upper opening of the limit sleeve (37) is smaller than the inner diameter of the lower part, and it is located outside the fixed sleeve (39) and is in interference fit with the fixed sleeve (39); The elastic device is an elastic capsule (42), and an elastic capsule base (43) is also provided. The upper end of the elastic capsule (42) abuts against the lower end face of the adjusting rod end cap (41) provided at the lower end of the adjusting rod (1), the lower end of the elastic capsule (42) abuts against the elastic capsule base (43), and the elastic capsule base (43) is placed on the pressure regulating pin (38);

[0149] As a further improvement of the one-way pressure regulating device, the specific setting of the pressure regulating device is as follows: The pressure regulating device includes a pressure regulating pin (38), a fixed sleeve (39), a limit sleeve (37) and a pressure regulating nut (40); The sliding mating sleeve (2) is radially provided with a pressure regulating pin hole that penetrates through both sides, and the axial length of the pressure regulating pin hole is greater than the transverse width; The fixed sleeve (39) is slidably sleeved on the outer wall of the sliding mating sleeve (2); The upper opening of the limit sleeve (37) is smaller than the inner diameter of the lower part, and it is located outside the fixed sleeve (39) and is in interference fit with the fixed sleeve (39); The elastic device is composed of a compression spring (4), a pressure sensor (44) and a pressure display (45). The upper end of the compression spring (4) abuts against the lower end of the adjusting rod (1), the lower end abuts against the upper end of the pressure sensor (44), the lower end of the pressure sensor (44) abuts against the pressure regulating pin (38), and the pressure sensor (44) is connected to the pressure display (45) through the pressure regulating pin hole;

[0150] As a further improvement of the one-way pressure regulating device, the specific setting of the pressure regulating device is as follows: The pressure regulating device includes a pressure regulating pin (38), a fixed sleeve (39), a limit sleeve (37) and a pressure regulating nut (40); The sliding mating sleeve (2) is radially provided with a pressure regulating pin hole that penetrates through both sides, and the axial length of the pressure regulating pin hole is greater than the transverse width; The fixed sleeve (39) is slidably sleeved on the outer wall of the sliding mating sleeve (2); The upper opening of the limit sleeve (37) is smaller than the inner diameter of the lower part, and it is located outside the fixed sleeve (39) and is in interference fit with the fixed sleeve (39); The elastic device is composed of an elastic capsule (42) and a pressure display (46), and an elastic capsule base (43) is also provided. The upper end of the elastic capsule (42) abuts against the lower end face of the adjusting rod end cap (41) provided at the lower end of the adjusting rod (1), the lower end of the elastic capsule (42) abuts against the elastic capsule base (43), the elastic capsule base (43) is placed on the pressure regulating pin (38), and the elastic capsule (42) is connected to the pressure display (46) through the pressure regulating pin hole;

[0151] As a further improvement of the one-way pressure regulating device, the specific setting of the pressure regulating device is as follows: The sliding mating nut (2) is radially provided with a retaining spring pin (50), a pressure regulating pin (38), and a long hole adapted to the retaining spring pin (50) and the pressure regulating pin (38). Fixed sleeves (49) and limit sleeves (48) are respectively arranged at both ends of the retaining spring pin (50). Fixed sleeves (39) and limit sleeves (37) are respectively arranged at both ends of the pressure regulating pin (38). The upper end of the retaining spring pin (50) abuts against the lower end of the adjusting rod (1). The outer wall of the sliding mating nut (2) is provided with a thread, and a pressure regulating nut (40) is arranged on the outer wall of the sliding mating nut. The upper end of the pressure regulating nut (40) abuts against the lower ends of the fixed sleeve (39) and the limit sleeve (37). The spring is a compression spring (47) sleeved outside the barrel wall of the sliding mating nut (2). The upper end abuts against the lower end of the fixed sleeve (39), and the lower end abuts against the upper end of the limit sleeve (37) of the pressure regulating pin (38);

[0152] As a further improvement of the one-way pressure regulating device, the specific setting of the pressure regulating device is as follows: The pressure regulating device includes a pressure regulating pin (38), a fixed sleeve (39), and a limit sleeve (37). The sliding mating nut (2) is radially provided with a pressure regulating pin hole that penetrates both sides, and the axial length of the pressure regulating pin hole is greater than the transverse width; The fixed sleeve (39) is slidably sleeved on the outer wall of the sliding mating nut (2); The upper opening of the limit sleeve (37) is smaller than the lower inner diameter and is located outside the fixed sleeve (39) and is in interference fit with the fixed sleeve (39); The pressure regulating pin (38) is in interference fit with the adjusting rod (1), and the fixed sleeve (39) and the limit sleeve (37) are slidably mated with the sliding mating nut (2); The spring is a compression spring (4) sleeved under the adjusting rod, and the lower end abuts against the pressure regulating pin (38). The inner diameter of the upper barrel wall of the sliding mating nut (2) is small, and the inner diameter of the lower barrel wall is large. The upper end of the spring (4) abuts against a step provided on the inner wall of the sliding mating nut (2) in the natural state;

[0153] As a further improvement of the one-way pressure regulating device, the specific setting of the pressure regulating device is as follows: As a further improvement of the one-way pressure regulating device, the specific setting of the pressure regulating device is as follows: The pressure regulating device includes a pressure regulating pin (38), a fixed sleeve (39), and a limit sleeve (37). The sliding mating nut (2) is radially provided with a pressure regulating pin hole that penetrates both sides, and the axial length of the pressure regulating pin hole is greater than the transverse width; The fixed sleeve (39) is slidably sleeved on the outer wall of the sliding mating nut (2); The upper opening of the limit sleeve (37) is smaller than the lower inner diameter and is located outside the fixed sleeve (39) and is in interference fit with the fixed sleeve (39); The pressure regulating pin (38) is in interference fit with the adjusting rod (1), and the fixed sleeve (39) and the limit sleeve (37) are slidably mated with the sliding mating nut (2); An anti-rotation pin (3) and an anti-rotation pin hole are provided under the adjusting rod (1). The spring is a compression spring (4) sleeved under the adjusting rod, and the lower end abuts against the pressure regulating pin (38). The inner diameter of the upper barrel wall of the sliding mating nut (2) is small, and the inner diameter of the lower barrel wall is large. The upper end of the spring (4) abuts against a step provided on the inner wall of the sliding mating nut (2) in the natural state;

[0154] As a further improvement of the one-way pressure regulating device, the specific setting of the pressure regulating device is as follows: The pressure regulating device includes a pressure regulating pin (38), a fixed sleeve (39), and a limit sleeve (37). A pressure regulating pin hole that penetrates through both sides in the radial direction is provided on the sliding mating screw sleeve (2). The axial length of the pressure regulating pin hole is greater than the transverse width. The fixed sleeve (39) is slidably sleeved on the outer wall of the sliding mating screw sleeve (2). The barrel opening of the limit sleeve (37) is smaller than the inner diameter of the lower part. It is located outside the fixed sleeve (39) and is in interference fit with the fixed sleeve (39). The pressure regulating pin (38) is in interference fit with the adjusting rod (1). The fixed sleeve (39) and the limit sleeve (37) are slidably mated with the sliding mating screw sleeve (2). The spring is a compression spring (47) on the outer wall of the sliding mating screw sleeve. The lower end abuts against the pressure regulating pin (38). The sliding mating screw sleeve (2) is set such that the outer diameter of the upper barrel wall is large and the outer diameter of the lower barrel wall is small. The upper end of the spring (47) abuts against a step provided on the outer wall of the sliding mating screw sleeve (2) in the natural state.

[0155] As a further improvement of the one-way pressure regulating device, the specific setting of the pressure regulating device is as follows: The elastic device can be set as a tension spring (56), which is located inside the barrel wall of the sliding mating screw sleeve (2). An anti-rotation pin (53) is provided at the lower part of the adjusting rod (1). The adjusting rod (1) is tightly fitted with the anti-rotation pin (53). A long groove adapted to the upper part of the tension spring (56) is axially provided at the lower end of the adjusting rod (1). Fixed sleeves (52) and limit sleeves (51) are provided at both ends of the anti-rotation pin (53). The fixed sleeves (52) and the limit sleeves (51) are slidably connected to the sliding mating screw sleeve (2). An adjusting nut (54) is provided below the anti-rotation pin (53). The adjusting nut (54) is threadedly connected to the sliding mating screw sleeve (2). An anti-rotation pin hole adapted to the anti-rotation pin (53) is provided on the barrel wall of the sliding mating screw sleeve (2). The axial length is greater than the radial length. Circular hooks are provided at the upper and lower ends of the tension spring (56). The upper hook is sleeved on the anti-rotation pin (53), and the lower hook is sleeved on the pressure regulating pin (57). Fixed sleeves (58) and limit sleeves (59) are provided at both ends of the pressure regulating pin (57). A pressure regulating nut (55) is provided above the limit sleeve (59). The lower part of the pressure regulating nut (55) abuts against the fixed sleeve (58) and the limit sleeve (59), and is sleeved on the outer wall of the sliding mating screw sleeve (2) and is threadedly connected to the sliding mating screw sleeve (2). An anti-rotation pin hole adapted to the pressure regulating pin (57) is provided on the barrel wall of the sliding mating screw sleeve (2). The axial length is greater than the radial length. Rotating the pressure regulating nut (55) downward can drive the fixed sleeve (58), the limit sleeve (59), the pressure regulating pin (57), and the tension spring (56) to move downward;

[0156] As a further improvement of the one-way pressure regulating device, the specific setting of the pressure regulating device is as follows: The spring (4) is located inside the barrel wall of the sliding fit sleeve (2). The lower part of the adjusting rod (1) axially penetrates through the spring (4). The lower part of the adjusting rod (1) is provided with a pressure regulating pin (62) and a pressure regulating pin (38). A long hole adapted to the pressure regulating pin (62) is radially provided at the lower part of the adjusting rod (1). The pressure regulating pin (38) radially penetrates through the adjusting rod (1) and is fixedly connected to the adjusting rod (1). Fixed sleeves (61) and limit sleeves (63) are respectively provided at both ends of the pressure regulating pin (62). Fixed sleeves (39) and limit sleeves (37) are respectively provided at both ends of the pressure regulating pin (38). The outer wall of the barrel of the sliding fit sleeve (2) is provided with threads, and long holes adapted to the pressure regulating pin (62) and the pressure regulating pin (38) are radially provided. The inner diameter of the upper barrel wall of the sliding fit sleeve (2) is larger than the inner diameter of the lower barrel wall. The upper part of the fixed rod (6) is a cylindrical diameter-varying part, which is slidably matched with the inner wall of the lower part of the sliding fit sleeve (2). Pressure regulating nuts (60) and pressure regulating nuts (40) are provided on the outer wall of the barrel of the sliding fit sleeve (2). The upper end of the pressure regulating nut (40) abuts against the lower ends of the fixed sleeve (39) and the limit sleeve (37). The lower end of the pressure regulating nut (60) abuts against the upper ends of the fixed sleeve (61) and the limit sleeve (63);

[0157] As a further improvement of the one-way pressure regulating device, the specific setting of the pressure regulating device is as follows: The spring (47) is located outside the barrel wall of the sliding fit sleeve (2). The lower part of the adjusting rod (1) is provided with a pressure regulating pin (62) and a pressure regulating pin (38). A long hole adapted to the pressure regulating pin (62) is radially provided at the lower part of the adjusting rod (1). The pressure regulating pin (38) radially penetrates through the adjusting rod (1) and is fixedly connected to the adjusting rod (1). Fixed sleeves (61) and limit sleeves (63) are respectively provided at both ends of the pressure regulating pin (62). Fixed sleeves (39) and limit sleeves (37) are respectively provided at both ends of the pressure regulating pin (38). The outer wall of the barrel of the sliding fit sleeve (2) is provided with threads, and long holes adapted to the pressure regulating pin (62) and the pressure regulating pin (38) are radially provided. Pressure regulating nuts (60) and pressure regulating nuts (40) are provided on the outer wall of the barrel of the sliding fit sleeve (2). The upper end of the pressure regulating nut (40) abuts against the lower ends of the fixed sleeve (39) and the limit sleeve (37). The lower end of the pressure regulating nut (60) abuts against the upper ends of the fixed sleeve (61) and the limit sleeve (63);

[0158] Furthermore, a two-way pressure regulating device for regulating the pressure of the adjusting rod (1) both upward and downward is provided on the barrel of the sliding fit sleeve (2);

[0159] Specific settings are as follows: The spring (4) is located inside the barrel wall of the sliding fit sleeve (2). The lower part of the adjusting rod (1) axially penetrates through the spring (4). The lower part of the adjusting rod (1) is provided with a pressure regulating pin (62) and a pressure regulating pin (38). The lower part of the adjusting rod (1) is radially provided with long holes adapted to the pressure regulating pin (62) and the pressure regulating pin (38). Both ends of the pressure regulating pin (38) are respectively provided with a fixing sleeve (39) and a limiting sleeve (37). Both ends of the pressure regulating pin (62) are respectively provided with a fixing sleeve (61) and a limiting sleeve (63). The outer wall of the sliding fit sleeve (2) is provided with threads and radially provided with long holes adapted to the pressure regulating pin (62) and the pressure regulating pin (38). The outer wall of the sliding fit sleeve (2) is provided with a pressure regulating nut (60) and a pressure regulating nut (40). The upper end of the pressure regulating nut (40) abuts against the lower ends of the fixing sleeve (39) and the limiting sleeve (37). The lower end of the pressure regulating nut (60) abuts against the upper ends of the fixing sleeve (61) and the limiting sleeve (63). A pressure scale is provided on the outer wall of the sliding fit sleeve (2).

[0160] As a further improvement of the pressure regulating device and the elastic device for two-way pressure regulation, the specific settings are as follows: The spring (47) is located outside the barrel wall of the sliding fit sleeve (2). The lower part of the adjusting rod (1) is provided with a pressure regulating pin (62) and a pressure regulating pin (38). The lower part of the adjusting rod (1) is radially provided with long holes adapted to the pressure regulating pin (62) and the pressure regulating pin (38). Both ends of the pressure regulating pin (38) are respectively provided with a fixing sleeve (39) and a limiting sleeve (37). Both ends of the pressure regulating pin (62) are respectively provided with a fixing sleeve (61) and a limiting sleeve (63). The outer wall of the sliding fit sleeve (2) is provided with threads and radially provided with long holes adapted to the pressure regulating pin (62) and the pressure regulating pin (38). The outer wall of the sliding fit sleeve (2) is provided with a pressure regulating nut (60) and a pressure regulating nut (40). The upper end of the pressure regulating nut (40) abuts against the lower ends of the fixing sleeve (39) and the limiting sleeve (37). The lower end of the pressure regulating nut (60) abuts against the upper ends of the fixing sleeve (61) and the limiting sleeve (63). A pressure scale is provided on the outer wall of the sliding fit sleeve (2).

[0161] As a further improvement of the voltage regulating device and the elastic device for two-way voltage regulation, the specific settings are as follows: The elastic device is set as two springs, which can regulate the voltage in both the upward and downward directions for the adjusting rod (1). The spring (4) is located inside the barrel wall of the sliding fit sleeve (2). The lower part of the adjusting rod (1) axially penetrates through the spring (4). The lower part of the adjusting rod (1) is radially provided with a voltage regulating pin (62) and a retaining spring pin (64), and a long hole adapted to the voltage regulating pin (62) is radially provided. Fixed sleeves (61) and limit sleeves (63) are respectively provided at both ends of the voltage regulating pin (62). The retaining spring pin (64) radially penetrates through the adjusting rod (1) and is fixedly connected to the adjusting rod (1). In the natural state, the upper end of the spring (4) abuts against the voltage regulating pin (62), and the lower end abuts against the retaining spring pin (64). The spring (65) is located inside the barrel wall of the sliding fit sleeve (2). The voltage regulating pin (38) radially penetrates through the barrel wall of the sliding fit sleeve (2), and fixed sleeves (39) and limit sleeves (37) are provided at both ends. In the natural state, the upper end of the spring (65) abuts against the retaining spring pin (64), and the lower end abuts against the voltage regulating pin (38). The outer wall of the sliding fit sleeve (2) is provided with threads, and long holes adapted to the voltage regulating pin (62), the voltage regulating pin (38), and the retaining spring pin (64) are radially provided. The inner diameter of the upper barrel wall of the sliding fit sleeve (2) is larger than the inner diameter of the lower barrel wall. The upper part of the fixed rod (6) is a cylindrical diameter-varying part, which is in sliding fit with the inner wall of the lower part of the sliding fit sleeve (2). Voltage regulating nuts (60) and voltage regulating nuts (40) are provided on the outer wall of the sliding fit sleeve (2). The upper end of the voltage regulating nut (40) abuts against the lower ends of the fixed sleeve (39) and the limit sleeve (37), and the lower end of the voltage regulating nut (60) abuts against the upper ends of the fixed sleeve (61) and the limit sleeve (63); A pressure scale is provided on the outer wall of the sliding fit sleeve (2);

[0162] As a further improvement of the pressure regulating device and the elastic device for two-way pressure regulation, the specific settings are as follows: The elastic device is set to two springs, which can regulate the pressure on the adjusting rod (1) both upward and downward. The springs (47) and (66) are both located outside the barrel wall of the sliding fit sleeve (2). The sliding fit sleeve (2) axially penetrates through the springs (47) and (66). The lower part of the adjusting rod (1) is radially provided with an anti-rotation pin (3) and a retaining spring pin (64). The adjusting rod (1) is radially provided with a long hole adapted to the anti-rotation pin (3), and the axial length is greater than the transverse length. The anti-rotation pin (3) is fixedly connected to the sliding fit sleeve (2). The retaining spring pin (64) radially penetrates the adjusting rod (1) and is fixedly connected to the adjusting rod (1). The sliding fit sleeve (2) is radially provided with a long hole adapted to the retaining spring pin (64), and the axial length is greater than the radial length. Pressure regulating nuts (60) and (40) are provided outside the barrel wall of the sliding fit sleeve (2) and are threadedly connected to the sliding fit sleeve (2). In the natural state, the upper end of the spring (47) abuts against the pressure regulating nut (60), and the lower end abuts against the retaining spring pin (64). The upper end of the spring (66) abuts against the retaining spring pin (64), and the lower end abuts against the pressure regulating nut (40). By rotating the pressure regulating nut (40) upward, the retaining spring pin can be driven to move upward (66), giving an upward acting force to the adjusting rod (1). By rotating the pressure regulating nut (60) downward, the retaining spring pin (64) can be driven to move downward, giving a downward acting force to the adjusting rod (1); A pressure scale is provided on the outer wall of the sliding fit sleeve (2);

[0163] As a further improvement of the pressure regulating device and the elastic device for two-way pressure regulation, the specific settings are as follows: The elastic device is set to two springs, which can regulate the pressure on the adjusting rod (1) both upward and downward. The spring (4) is located above the sliding fit sleeve (2). The adjusting rod (1) axially penetrates through the spring (4). The spring (66) is located outside the barrel wall of the sliding fit sleeve (2). The sliding fit sleeve (2) axially penetrates through the spring (66). A pressure regulating sleeve (67) is provided at the upper end of the sliding fit sleeve (2), and its upper end is slidably connected to the adjusting rod (1). The inner wall of the lower part is provided with threads and is threadedly connected to the sliding fit sleeve (2). A fastening nut (7) is provided on the adjusting rod (1) and is threadedly connected to the adjusting rod (1) to limit the sliding of the adjusting rod (1). The adjusting rod (1) is radially provided with a pressure regulating pin (68), an anti-rotation pin (3), and a retaining spring pin (64) from top to bottom. The adjusting rod (1) is radially provided with a long hole adapted to the anti-rotation pin (3), and the axial length is greater than the radial length. The anti-rotation pin (3) is fixedly connected to the sliding fit sleeve (2). The pressure regulating pin (68) and the retaining spring pin (64) are fixedly connected to the adjusting rod (1). The sliding fit sleeve (2) is radially provided with a long hole adapted to the retaining spring pin (64), and the axial length is greater than the radial length. A pressure regulating nut (40) is provided outside the barrel wall of the sliding fit sleeve and is threadedly connected to the sliding fit sleeve (2). In the natural state, the upper end of the spring (4) abuts against the pressure regulating sleeve (67), and the lower end abuts against the pressure regulating pin (68). The upper end of the spring (66) abuts against the retaining spring pin (64), and the lower end abuts against the pressure regulating nut (40); A pressure scale is provided on the outer wall of the sliding fit sleeve (2);

[0164] As a further improvement of the pressure regulating device and the elastic device for two-way pressure regulation, the specific settings are as follows: The elastic device is set as two springs, which can regulate the pressure on the adjusting rod (1) both upward and downward. The spring (4) and the spring (65) are both located above the sliding fit nut (2). The adjusting rod (1) axially penetrates through the spring (4) and the spring (65). The upper end of the sliding fit nut (2) is provided with a pressure regulating nut (69), the upper end of which is slidably connected to the adjusting rod (1), and the inner wall of the lower part is provided with threads and is threadedly connected to the sliding fit nut (2). The outer wall of the pressure regulating nut (69) is provided with threads, and the upper part is provided with a pressure regulating nut (67), and the pressure regulating nut (67) is threadedly connected to the pressure regulating nut (69). The adjusting rod (1) is radially provided with a retaining spring pin (68) and an anti-rotation pin (3). The retaining spring pin (68) is fixedly connected to the adjusting rod (1). The adjusting rod (1) is radially provided with a long hole adapted to the anti-rotation pin (3), and the anti-rotation pin (3) is fixedly connected to the sliding fit nut (2). In the natural state, the upper end of the spring (4) abuts against the pressure regulating nut (67), and the lower end abuts against the retaining spring pin (68). The upper end of the spring (65) abuts against the retaining spring pin (68), and the lower end abuts against the pressure regulating nut (69). The outer walls of the sliding fit nut (2) and the pressure regulating nut (69) are provided with pressure scales;

[0165] As a further improvement of the pressure regulating device and the elastic device for two-way pressure regulation, the specific settings are as follows: The elastic device can be set as two springs, which can regulate the pressure on the adjusting rod (1) both upward and downward. The spring (47) is located outside the barrel wall of the sliding fit nut (2), and the tension spring (56) is located inside the barrel wall of the sliding fit nut (2). The lower end of the adjusting rod (1) is axially provided with a long groove adapted to the upper part of the tension spring (52). The lower part of the adjusting rod (1) is radially provided with an anti-rotation pin (3) and a pressure regulating pin (53). The adjusting rod (1) is fixedly connected to the anti-rotation pin (3) and the pressure regulating pin (53). The pressure regulating pin (57) is radially arranged on the sliding fit nut (2). The barrel wall of the sliding fit nut (2) is radially provided with long holes adapted to the anti-rotation pin (3), the pressure regulating pin (53), and the pressure regulating pin (57), and the axial length is greater than the radial length. Fixed sleeves (52) and limit sleeves (51) are arranged at both ends of the pressure regulating pin (53). Fixed sleeves (58) and limit sleeves (59) are arranged at both ends of the pressure regulating pin (57). Circular hooks are arranged at the upper and lower ends of the tension spring (56). The upper hook is sleeved on the pressure regulating pin (53), and the lower hook is sleeved on the pressure regulating pin (57). In the natural state, the upper end of the spring (47) abuts against the anti-rotation pin (3), and the lower end abuts against above the fixed sleeve (52) and the limit sleeve (51). A pressure regulating nut (54) is arranged below the pressure regulating pin (53), and the pressure regulating nut (54) is threadedly connected to the sliding fit nut (2). The lower part of the pressure regulating nut (55) abuts against the fixed sleeve (58) and the limit sleeve (59). The pressure regulating nut (55) is sleeved on the outer wall of the sliding fit nut (2). The outer wall of the sliding fit nut (2) is provided with a pressure scale.

[0166] Figure 1It is the I-type structure of the adjustable pressure fixing device, the connecting structure I-type structure of the adjusting rod and the sliding fit screw sleeve, the I-type structure of the restricting adjusting rod sliding fixing structure, the I-type structure of the fixing rod and the sliding fit screw sleeve connecting structure. An anti-rotation pin (3) is radially arranged on the upper part of the sliding fit screw sleeve (2), a fastening nut (7) is arranged on the adjusting rod, and a fastening set screw (5) is radially arranged on the lower part of the sliding fit screw sleeve (2). The elastic device is a spring (4);

[0167] Figure 2 It is the II-type structure of the connecting structure of the adjusting rod and the sliding fit screw sleeve of the adjustable pressure fixing device. Two cylindrical key pins (8) are radially arranged on the pipe wall of the sliding fit screw sleeve (2) and are in sliding fit with the anti-rotation pin holes arranged at the lower part of the adjusting rod (1);

[0168] Figure 3 It is the III-type structure of the connecting structure of the adjusting rod and the sliding fit screw sleeve of the adjustable pressure fixing device. One cylindrical key pin (8) is radially arranged on the pipe wall of the sliding fit screw sleeve (2) and is in sliding fit with the anti-rotation pin holes arranged at the lower part of the adjusting rod (1);

[0169] Figure 4 It is the IV-type structure of the connecting structure of the adjusting rod and the sliding fit screw sleeve of the adjustable pressure fixing device. Specifically, a guiding flat key (9) is set, and key grooves corresponding to the guiding flat key (9) are set on the inner wall of the upper part of the sliding fit screw sleeve and the outer wall of the lower part of the adjusting rod;

[0170] Figure 5 It is the V-type structure of the connecting structure of the adjusting rod and the sliding fit screw sleeve of the adjustable pressure fixing device. The lower end of the adjusting rod (1) is provided with a cylindrical outer diameter enlarged part, and an anti-rotation plane is set on the outer diameter of the enlarged part. A convex plane is set on the inner wall of the upper part of the sliding fit screw sleeve (2) and is in sliding fit with the plane set at the lower end of the adjusting rod (1);

[0171] Figure 6 It is the VI-type structure of the connecting structure of the adjusting rod and the sliding fit screw sleeve of the adjustable pressure fixing device. A convex plane is set on the inner wall of the upper part of the sliding fit screw sleeve (2). An anti-disengagement sleeve (11) is set at the lower end of the adjusting rod (1), and the anti-disengagement sleeve (11) is fixedly connected to the adjusting rod (1) with a fastening pin (12). A plane is set on the outer wall of the anti-disengagement sleeve (11) and is matched with the plane set on the inner wall of the upper part of the sliding fit screw sleeve (2);

[0172] Figure 7 It is the VII-type structure of the connecting structure of the adjusting rod and the sliding fit screw sleeve of the adjustable pressure fixing device. A convex plane is set on the inner wall of the upper part of the sliding fit screw sleeve (2). An anti-disengagement sleeve (11) is set at the lower end of the adjusting rod (1), which is in the shape of a cylindrical barrel. The anti-disengagement sleeve (11) is fixedly connected to the adjusting rod (1) with a fastening set screw (13), and a plane is set on the outer wall of the anti-disengagement sleeve (11);

[0173] Figure 8The adjustable pressure fixing device has a split structure of the sliding fit sleeve, with the sliding fit sleeve (2) being divided into an upper part (2) and a lower part (15) of the sliding fit sleeve, and fastened and connected by a fastening pin (14);

[0174] Figure 9 The adjustable pressure fixing device has a structure of restricting the sliding and fixing of the adjusting rod, Type II structure. A fastening setscrew (16) is provided on the upper side wall of the sliding fit sleeve (2), threadedly connected to the side wall of the sliding fit sleeve (2), and screwed in to abut against the outer wall of the adjusting rod (1) to restrict the sliding of the adjusting rod (1);

[0175] Figure 10 The adjustable pressure fixing device has a structure of restricting the sliding and fixing of the adjusting rod, Type III structure. A limiting sleeve (17) is provided on the outer wall of the adjusting rod (1) at the upper end of the sliding fit sleeve (2), and the limiting sleeve (17) and the adjusting rod (1) are fastened and connected by a fastening setscrew (18);

[0176] Figure 11 The adjustable pressure fixing device has a structure of restricting the sliding and fixing of the adjusting rod, Type IV structure. A limiting clamp block (20) is provided on the outer wall of the adjusting rod (1) at the upper end of the sliding fit sleeve (2). A fastening screw (19) is provided on the limiting clamp block (20), and a threaded hole is provided on the limiting clamp block at the head end of the fastening screw (19). By screwing the fastening screw (19) tightly, the limiting clamp block (20) can be fixed to the adjusting rod (1);

[0177] Figure 12 The adjustable pressure fixing arm has a structure of restricting the sliding and fixing of the adjusting rod, Type V structure. A limiting pin (21) is provided on the adjusting rod (1) at the upper end of the sliding fit sleeve (2), and the limiting pin (21) and the adjusting rod (1) are fastened and connected. A limiting sleeve (22) is provided at the upper end of the sliding fit sleeve (2), and the inner wall of the limiting sleeve (22) is threadedly connected to the upper end of the sliding fit sleeve (2);

[0178] Figure 13 For the structure of connecting the fixing rod and the sliding fit sleeve of the adjustable pressure fixing device, Type II structure. The upper part of the fixing rod (6) and the lower part of the sliding fit sleeve (2) are fastened and connected by a fastening pin (23);

[0179] Figure 14 For the structure of connecting the fixing rod and the sliding fit sleeve of the adjustable pressure fixing device, Type III structure. The sliding fit sleeve (2) is threadedly connected to the upper part of the fixing rod (6), and a fastening nut (24) is provided on the upper part of the fixing rod (6) to fix the fixing rod (6);

[0180] Figure 15 For the structure of connecting the fixing rod and the sliding fit sleeve of the adjustable pressure fixing device, Type IV structure. The fixing rod (6) and the sliding fit sleeve (2) are integrated, and a cylindrical diameter enlarged part is provided on the upper part of the fixing rod (6), presenting a cylindrical structure;

[0181] Figure 16It is a V-shaped structure of the connecting structure between the fixing rod and the sliding mating nut of the adjustable pressure fixing device. A fixing nut (25) is provided on the outer wall of the lower part of the sliding mating nut (2), and is fixedly connected to the sliding mating nut (2) by a fixing pin (28). A fastening set screw (5) is radially arranged on the side wall of the fixing nut (25) to fix the fixing rod (6); two radially penetrating pin holes are provided at different axial heights of the fixing rod (6), and two clamping tube pins (27) radially penetrate the fixing rod (6) and are respectively matched with the upper and lower step parts of the fastening nut (26) and the lower end of the fastening nut (26);

[0182] Figure 17 It is a VI-shaped structure of the connecting structure between the fixing rod and the sliding mating nut of the adjustable pressure fixing device. A cylindrically shaped thickened part of the barrel wall is provided on the outer wall of the lower part of the sliding mating nut (2), and a fastening set screw (5) is radially arranged on the side wall. Two radially penetrating pin holes are provided at different axial heights of the fixing rod (6), and two clamping tube pins (27) radially penetrate the fixing rod (6) and are respectively matched with the upper and lower step parts of the fastening nut (26) and the lower end of the fastening nut (26);

[0183] Figure 18 It is a VII-shaped structure of the connecting structure between the fixing rod and the sliding mating nut of the adjustable pressure fixing device. A thread gasket (29), a fixing rod screw (30), and a sliding hole for the fixing rod screw are provided on the outer wall of the lower part of the sliding mating nut (2). The inner wall of the thread gasket (029) is threaded and is threadedly connected to the lower part of the sliding mating nut (2). The head end of the fixing rod screw (30) is threadedly connected to the upper part of the fixing rod (6). The fixing rod (6) is configured to be slidably mated with the lower part of the sliding mating nut (2) and the lower part of the fastening nut (26). Two radially penetrating pin holes are provided at different axial heights of the fixing rod (6), and two clamping tube pins (27) radially penetrate the fixing rod (6) and are respectively matched with the upper and lower step parts of the fastening nut (26) and the lower end of the fastening nut (26);

[0184] Figure 19 It is an VIII-shaped structure of the connecting structure between the fixing rod and the sliding mating nut of the adjustable pressure fixing device. A thread gasket (29), a fixing rod screw (30), a sliding hole for the fixing rod screw, and an adjusting nut (31) are provided on the outer wall of the lower part of the sliding mating nut (2). The inner wall of the thread gasket (029) is threaded and is threadedly connected to the lower part of the sliding mating nut (2). The head end of the fixing rod screw (30) is threadedly connected to the upper part of the fixing rod (6); the fixing rod (6) is configured to be slidably mated with the lower part of the sliding mating nut (2), and the adjusting nut (31) is threadedly connected to the lower part of the sliding mating nut (2) and is arranged below the thread gasket (29);

[0185] Figure 20It is a type IX structure of the connecting structure between the fixed rod and the sliding sleeve of the adjustable pressure fixing device. A connecting sleeve (33) is provided on the outer wall of the lower part of the sliding sleeve (2). After being threadedly connected to the sliding sleeve (2), it is firmly connected with a fixing pin (32). A fastening set screw (5) is radially provided on the connecting sleeve (33); the fixed rod (6) is configured to be slidably matched with the lower part of the sliding sleeve (2), the lower part of the connecting sleeve (33), and the lower part of the fastening nut (26). Two radially penetrating pin holes are provided at different axial heights of the fixed rod (6). Two clamping tube pins (27) radially penetrate the fixed rod (6) and are respectively matched with the upper and lower step parts of the fastening nut (26) and the lower end of the fastening nut (26);

[0186] Figure 21 It is a type X structure of the connecting structure between the fixed rod and the sliding sleeve of the adjustable pressure fixing device. Adjusting nuts (34) and adjusting nuts (36) are provided on the outer wall of the lower part of the sliding sleeve (2). The fixed rod (6) is configured to be slidably matched with the lower part of the sliding sleeve (2), and a fixed rod pin (35) is radially provided at the upper end. The adjusting nuts (34) and the adjusting nuts (36) are respectively located above and below the fixed rod pin (35) and are threadedly connected to the lower part of the sliding sleeve (2);

[0187] A one-way pressure regulating device can be provided in the middle of the sliding sleeve (2). The pressure regulating device is composed of a limit sleeve (37), a pressure regulating pin (38), a fixed sleeve (39), and a pressure regulating nut (40).

[0188] Figure 22 It is a type II structure of the pressure regulating device of the adjustable pressure fixing device. The pressure regulating device includes a pressure regulating pin (38), a fixed sleeve (39), a limit sleeve (37), and a pressure regulating nut (40); a pressure regulating pin hole penetrating both sides is radially provided on the sliding sleeve (2); the fixed sleeve (39) is slidably sleeved on the outer wall of the sliding sleeve (2); the limit sleeve (37) is located outside the fixed sleeve (39); the elastic device is a compression spring (4). The upper end of the compression spring (4) abuts against the lower end of the adjusting rod (1), and the lower end abuts against the pressure regulating pin (38);

[0189] Figure 23 It is a type III structure of the pressure regulating device of the adjustable pressure fixing device. The pressure regulating device includes a pressure regulating pin (38), a fixed sleeve (39), a limit sleeve (37), and a pressure regulating nut (40); a pressure regulating pin hole penetrating both sides is radially provided on the sliding sleeve (2); the fixed sleeve (39) is slidably sleeved on the outer wall of the sliding sleeve (2); the limit sleeve (37) is located outside the fixed sleeve (39); the elastic device is an elastic capsule (42), and an elastic capsule base (43) is also provided. The upper end of the elastic capsule (42) abuts against the lower end face of the adjusting rod end cap (41) provided at the lower end of the adjusting rod (1), the lower end of the elastic capsule (42) abuts against the elastic capsule base (43), and the elastic capsule base (43) is placed on the pressure regulating pin (38);

[0190] Figure 24 It is the IV-type structure of the pressure regulating device for the adjustable pressure fixing device. The pressure regulating device includes a pressure regulating pin (38), a fixing sleeve (39), a limiting sleeve (37) and a pressure regulating nut (40); a pressure regulating pin hole penetrating through both sides is radially provided on the sliding fit screw sleeve (2); the fixing sleeve (39) is slidably sleeved on the outer wall of the sliding fit screw sleeve (2); the limiting sleeve (37) is in interference fit with the fixing sleeve (39); the elastic device is composed of a compression spring (4), a pressure sensor (44) and a pressure display (45), and the pressure sensor (44) is connected to the pressure display (45) through the pressure regulating pin hole;

[0191] Figure 25 It is the V-type structure of the pressure regulating device for the adjustable pressure fixing device. The pressure regulating device includes a pressure regulating pin (38), a fixing sleeve (39), a limiting sleeve (37) and a pressure regulating nut (40); a pressure regulating pin hole penetrating through both sides is radially provided on the sliding fit screw sleeve (2); the fixing sleeve (39) is slidably sleeved on the outer wall of the sliding fit screw sleeve (2); the limiting sleeve (37) is in interference fit with the fixing sleeve (39); the elastic device is composed of an elastic capsule (42) and a pressure display (46), and an elastic capsule base (43) is also provided. The upper end of the elastic capsule (42) abuts against the lower end surface of the adjusting rod end cap (41) provided at the lower end of the adjusting rod (1), and the elastic capsule (42) is connected to the pressure display (46) through the pressure regulating pin hole;

[0192] Figure 26 It is the VI-type structure of the pressure regulating device for the adjustable pressure fixing device. The sliding fit screw sleeve (2) is radially provided with a retaining spring pin (50), a pressure regulating pin (38), and a long hole adapted to the retaining spring pin (50) and the pressure regulating pin (38). Fixing sleeves (49) and limiting sleeves (48) are respectively provided at both ends of the retaining spring pin (50), and fixing sleeves (39) and limiting sleeves (37) are respectively provided at both ends of the pressure regulating pin (38). The upper part of the retaining spring pin (50) abuts against the lower end of the adjusting rod (1), and a pressure regulating nut (40) is provided outside the wall of the sliding fit screw sleeve. The spring is a compression spring (47) sleeved outside the wall of the sliding fit screw sleeve (2);

[0193] Figure 27 It is the VII-type structure of the pressure regulating device for the adjustable pressure fixing device. The pressure regulating device includes a pressure regulating pin (38), a fixing sleeve (39), a limiting sleeve (37). A pressure regulating pin hole penetrating through both sides is radially provided on the sliding fit screw sleeve (2), and the axial length of the pressure regulating pin hole is greater than the transverse width; the fixing sleeve (39) is slidably sleeved on the outer wall of the sliding fit screw sleeve (2); the limiting sleeve (37) is in interference fit with the fixing sleeve (39); the pressure regulating pin (38) is in interference fit with the adjusting rod (1), and the spring is a compression spring (4) sleeved under the adjusting rod. The upper end of the spring (4) abuts against the step provided on the inner wall of the sliding fit screw sleeve (2) in the natural state;

[0194] Figure 28It is the structure of Type VIII pressure regulating device for the adjustable pressure fixing device. As a further improvement of the one-way pressure regulating device, the specific settings of the pressure regulating device are as follows: The pressure regulating device includes a pressure regulating pin (38), a fixing sleeve (39), a limiting sleeve (37). The pressure regulating pin holes that penetrate through both sides are radially arranged on the sliding mating screw sleeve (2); the fixing sleeve (39) is slidably sleeved on the outer wall of the sliding mating screw sleeve (2); the limiting sleeve (37) is in interference fit with the fixing sleeve (39); the pressure regulating pin (38) is in interference fit with the adjusting rod (1). An anti-rotation pin (3) and an anti-rotation pin hole are arranged below the adjusting rod (1). The spring is a compression spring (4) sleeved below the adjusting rod. The upper end of the spring (4) abuts against the step arranged on the inner wall of the sliding mating screw sleeve (2) in the natural state;

[0195] Figure 29 It is the structure of Type IX pressure regulating device for the adjustable pressure fixing device. The pressure regulating device includes a pressure regulating pin (38), a fixing sleeve (39), a limiting sleeve (37). The pressure regulating pin holes that penetrate through both sides are radially arranged on the sliding mating screw sleeve (2); the fixing sleeve (39) is slidably sleeved on the outer wall of the sliding mating screw sleeve (2); the limiting sleeve (37) is in interference fit with the fixing sleeve (39); the pressure regulating pin (38) is in interference fit with the adjusting rod (1). The spring is a compression spring (47) on the outer wall of the sliding mating screw sleeve. The upper end of the spring (47) abuts against the step arranged on the outer wall of the sliding mating screw sleeve (2) in the natural state.

[0196] Figure 30 It is the structure of Type X pressure regulating device for the adjustable pressure fixing device. The elastic device can be set as a tension spring (56), which is located inside the barrel wall of the sliding mating screw sleeve (2). An anti-rotation pin (53) is arranged at the lower part of the adjusting rod (1). A long groove adapted to the upper part of the tension spring (56) is axially arranged at the lower end of the adjusting rod (1). Fixing sleeves (52) are arranged at both ends of the anti-rotation pin (53). A position adjusting nut (54) is arranged below the anti-rotation pin (53). Circular hooks are arranged at the upper and lower ends of the tension spring (56). The upper hook is sleeved on the anti-rotation pin (53), and the lower hook is sleeved on the pressure regulating pin (57). Fixing sleeves (58) and limiting sleeves (59) are arranged at both ends of the pressure regulating pin (57). A pressure regulating nut (55) is arranged above the limiting sleeve (59) and is sleeved on the outer wall of the sliding mating screw sleeve (2);

[0197] Figure 31 It is the structure of Type XI pressure regulating device for the adjustable pressure fixing device. The spring (4) is located inside the barrel wall of the sliding mating screw sleeve (2). The adjusting rod (1) axially penetrates through the spring (4) at the lower part. Pressure regulating pins (62) and a pressure regulating pin (38) are arranged at the lower part of the adjusting rod (1). Fixing sleeves (61) and limiting sleeves (63) are respectively arranged at both ends of the pressure regulating pin (62). Fixing sleeves (39) and limiting sleeves (37) are respectively arranged at both ends of the pressure regulating pin (38). The inner diameter of the upper barrel wall of the sliding mating screw sleeve (2) is larger than the inner diameter of the lower barrel wall. The upper part of the fixing rod (6) is a cylindrical diameter-varying part, which is in sliding fit with the inner wall of the lower part of the sliding mating screw sleeve (2). Pressure regulating nuts (60) and a pressure regulating nut (40) are arranged on the outer wall of the barrel wall of the sliding mating screw sleeve (2);

[0198] Figure 32 It is the structure of Type XII pressure regulating device for the adjustable pressure fixing device. The spring (47) is located outside the barrel wall of the sliding fit sleeve (2). The lower part of the adjusting rod (1) is provided with a pressure regulating pin (62) and a pressure regulating pin (38). A long hole adapted to the pressure regulating pin (62) is radially provided at the lower part of the adjusting rod (1). The pressure regulating pin (38) radially penetrates through the adjusting rod (1) and is fixedly connected to the adjusting rod (1). Fixed sleeves (61) and limit sleeves (63) are respectively provided at both ends of the pressure regulating pin (62). Fixed sleeves (39) and limit sleeves (37) are respectively provided at both ends of the pressure regulating pin (38). Pressure regulating nuts (60) and pressure regulating nuts (40) are provided outside the barrel wall of the sliding fit sleeve (2);

[0199] A two-way pressure regulating device that can regulate the pressure of the adjusting rod (1) both upward and downward is provided on the barrel of the sliding fit sleeve (2);

[0200] Figure 33 It is the structure of Type XIII pressure regulating device for the adjustable pressure fixing device. The spring (4) is located inside the barrel wall of the sliding fit sleeve (2). The lower part of the adjusting rod (1) axially penetrates through the spring (4). The lower part of the adjusting rod (1) is provided with a pressure regulating pin (62) and a pressure regulating pin (38). Long holes adapted to the pressure regulating pin (62) and the pressure regulating pin (38) are radially provided at the lower part of the adjusting rod (1). Fixed sleeves (39) and limit sleeves (37) are respectively provided at both ends of the pressure regulating pin (38). Fixed sleeves (61) and limit sleeves (63) are respectively provided at both ends of the pressure regulating pin (62). Long holes adapted to the pressure regulating pin (62) and the pressure regulating pin (38) are radially provided on the sliding fit sleeve (2). Pressure regulating nuts (60) and pressure regulating nuts (40) are provided outside the barrel wall of the sliding fit sleeve (2). A pressure scale is provided on the outer wall of the sliding fit sleeve (2);

[0201] Figure 34 It is the structure of Type XIV pressure regulating device for the adjustable pressure fixing device. The spring (47) is located outside the barrel wall of the sliding fit sleeve (2). The lower part of the adjusting rod (1) is provided with a pressure regulating pin (62) and a pressure regulating pin (38). Long holes adapted to the pressure regulating pin (62) and the pressure regulating pin (38) are radially provided at the lower part of the adjusting rod (1). Fixed sleeves (39) and limit sleeves (37) are respectively provided at both ends of the pressure regulating pin (38). Fixed sleeves (61) and limit sleeves (63) are respectively provided at both ends of the pressure regulating pin (62). Long holes adapted to the pressure regulating pin (62) and the pressure regulating pin (38) are radially provided on the sliding fit sleeve (2). Pressure regulating nuts (60) and pressure regulating nuts (40) are provided outside the barrel wall of the sliding fit sleeve (2). A pressure scale is provided on the outer wall of the sliding fit sleeve (2);

[0202] Figure 35It is the XV-type structure of the pressure-regulating device for the adjustable pressure fixing device. The elastic device is set as two springs. Spring (4) is located inside the barrel wall of the sliding fit sleeve (2). The lower part of the adjusting rod (1) axially penetrates through spring (4). The lower part of the adjusting rod (1) is radially provided with a pressure-regulating pin (62) and a retaining ring pin (64). Fixed sleeves (61) and limit sleeves (63) are respectively arranged at both ends of the pressure-regulating pin (62). The retaining ring pin (64) radially penetrates through the adjusting rod (1) and is fixedly connected with the adjusting rod (1). Spring (65) is located inside the barrel wall of the sliding fit sleeve (2). The pressure-regulating pin (38) radially penetrates through the barrel wall of the sliding fit sleeve (2), and fixed sleeves (39) and limit sleeves (37) are arranged at both ends. In the natural state, the upper end of spring (65) abuts against the retaining ring pin (64), and the lower end abuts against the pressure-regulating pin (38). The sliding fit sleeve (2) is radially provided with long holes adapted to the pressure-regulating pin (62), the pressure-regulating pin (38), and the retaining ring pin (64). The upper part of the fixed rod (6) is a cylindrical diameter-varying part, which is in sliding fit with the inner wall of the lower part of the sliding fit sleeve (2). Pressure-regulating nuts (60) and pressure-regulating nuts (40) are arranged outside the barrel wall of the sliding fit sleeve (2). A pressure scale is arranged on the outer wall of the sliding fit sleeve (2).

[0203] Figure 36 It is the XVI-type structure of the pressure-regulating device for the adjustable pressure fixing device. The elastic device is set as two springs. Springs (47) and (66) are both located outside the barrel wall of the sliding fit sleeve (2). The lower part of the adjusting rod (1) is radially provided with an anti-rotation pin (3) and a retaining ring pin (64). The adjusting rod (1) is radially provided with a long hole adapted to the anti-rotation pin (3). The anti-rotation pin (3) is fixedly connected with the sliding fit sleeve (2). The retaining ring pin (64) radially penetrates through the adjusting rod (1) and is fixedly connected with the adjusting rod (1). The sliding fit sleeve (2) is radially provided with a long hole adapted to the retaining ring pin (64). Pressure-regulating nuts (60) and pressure-regulating nuts (40) are arranged outside the barrel wall of the sliding fit sleeve (2). In the natural state, the upper end of spring (47) abuts against the pressure-regulating nut (60), and the lower end abuts against the retaining ring pin (64). The upper end of spring (66) abuts against the retaining ring pin (64), and the lower end abuts against the pressure-regulating nut (40). A pressure scale is arranged on the outer wall of the sliding fit sleeve (2).

[0204] Figure 37It is the structure of Type XVII pressure regulating device for the adjustable pressure fixing device. The elastic device is set as two springs. Spring (4) is located above the sliding fit sleeve (2). The adjusting rod (1) axially penetrates through spring (4). Spring (66) is located outside the barrel wall of the sliding fit sleeve (2). The sliding fit sleeve (2) axially penetrates through spring (66). A pressure regulating sleeve (67) is provided at the upper end of the sliding fit sleeve (2). Its upper end is slidably connected to the adjusting rod (1). The inner wall of the lower part is provided with threads and is threadedly connected to the sliding fit sleeve (2). A fastening nut (7) is provided on the adjusting rod (1) and is threadedly connected to the adjusting rod (1). The adjusting rod (1) is radially provided with a pressure regulating pin (68), an anti-rotation pin (3), and a retaining spring pin (64) from top to bottom. The adjusting rod (1) is radially provided with a long hole adapted to the anti-rotation pin (3). The anti-rotation pin (3) is fixedly connected to the sliding fit sleeve (2). The pressure regulating pin (68) and the retaining spring pin (64) are fixedly connected to the adjusting rod (1). The sliding fit sleeve (2) is radially provided with a long hole adapted to the retaining spring pin (64). A pressure regulating nut (40) is provided outside the barrel wall of the sliding fit sleeve (2) and is threadedly connected to the sliding fit sleeve (2). In the natural state, the upper end of spring (4) abuts against the pressure regulating sleeve (67), and the lower end abuts against the pressure regulating pin (68). The upper end of spring (66) abuts against the retaining spring pin (64), and the lower end abuts against the pressure regulating nut (40); A pressure scale is provided on the outer wall of the sliding fit sleeve (2);

[0205] Figure 38 It is the structure of Type XVIII pressure regulating device for the adjustable pressure fixing device. The elastic device is set as two springs. Spring (4) and spring (65) are both located above the sliding fit sleeve (2). The adjusting rod (1) axially penetrates through spring (4) and spring (65). A pressure regulating sleeve (69) is provided at the upper end of the sliding fit sleeve (2). Its upper end is slidably connected to the adjusting rod (1). The inner wall of the lower part is provided with threads and is threadedly connected to the sliding fit sleeve (2). The outer wall of the pressure regulating sleeve (69) is provided with threads, and a pressure regulating sleeve (67) is provided at the upper part. The pressure regulating sleeve (67) is threadedly connected to the pressure regulating sleeve (69). The adjusting rod (1) is radially provided with a retaining spring pin (68) and an anti-rotation pin (3). The retaining spring pin (68) is fixedly connected to the adjusting rod (1). The adjusting rod (1) is radially provided with a long hole adapted to the anti-rotation pin (3). The anti-rotation pin (3) is fixedly connected to the sliding fit sleeve (2). In the natural state, the upper end of spring (4) abuts against the pressure regulating sleeve (67), and the lower end abuts against the retaining spring pin (68). The upper end of spring (65) abuts against the retaining spring pin (68), and the lower end abuts against the pressure regulating sleeve (69). A pressure scale is provided on the outer wall of the sliding fit sleeve (2) and the outer wall of the pressure regulating sleeve (69);

[0206] Figure 39It is the XIX-type structure of the pressure regulating device for the adjustable pressure fixing device. The elastic device can be set to 2 springs. The spring (47) is located outside the barrel wall of the sliding fit sleeve (2), and the tension spring (56) is located inside the barrel wall of the sliding fit sleeve (2). A long groove adapted to the upper part of the tension spring (52) is axially provided at the lower end of the adjusting rod (1). Anti-rotation pins (3) and pressure regulating pins (53) are radially provided at the lower part of the adjusting rod (1). The adjusting rod (1) is fixedly connected to the anti-rotation pins (3) and the pressure regulating pins (53). The pressure regulating pin (57) is radially provided on the sliding fit sleeve (2). Long holes adapted to the anti-rotation pins (3), the pressure regulating pins (53), and the pressure regulating pin (57) are radially provided on the barrel wall of the sliding fit sleeve (2). Fixed sleeves (52) and limit sleeves (51) are provided at both ends of the pressure regulating pin (53). Fixed sleeves (58) and limit sleeves (59) are provided at both ends of the pressure regulating pin (57). Circular hooks are provided at the upper and lower ends of the tension spring (56). The upper hook is sleeved on the pressure regulating pin (53), and the lower hook is sleeved on the pressure regulating pin (57). In the natural state, the upper end of the spring (47) abuts against the anti-rotation pin (3), and the lower end abuts against the upper part of the fixed sleeve (52) and the limit sleeve (51). A pressure regulating nut (54) is provided below the pressure regulating pin (53). The lower part of the pressure regulating nut (55) abuts against the fixed sleeve (58) and the limit sleeve (59). The pressure regulating nut (55) is sleeved on the outer wall of the sliding fit sleeve (2). A pressure scale is provided on the outer wall of the sliding fit sleeve (2).

[0207] Figure 40 It is the single-arm type I structure of the combined external fixation bracket with adjustable pressure. The sliding fit sleeve is set as the upper part (2) and the lower part (15) of the sliding fit sleeve, and they are fixedly connected by a connecting pin (14). The pressure regulating device is set as follows: The pressure regulating device includes a pressure regulating pin (38), a fixed sleeve (39), a limit sleeve (37), and a pressure regulating nut (40); the elastic device is a compression spring (4); the connecting mechanism between the lower part (15) of the sliding fit sleeve and the fixed rod (6) is set as a cylindrical barrel wall thickening part is provided on the outer wall of the lower part of the lower part (15) of the sliding fit sleeve, and fastening set screws (5) are radially provided on the side wall. Two clamping tube pins (27) radially penetrate the fixed rod (6) and are respectively matched with the upper and lower step parts of the fastening nut (26) and the lower end of the fastening nut (26); an anti-rotation pin (3) is radially provided on the upper part of the sliding fit sleeve (2), a fastening nut (7) is provided on the outer wall of the adjusting rod (1) at the upper end of the sliding fit sleeve (2), and a rod needle clip (70) is provided on the fixed rod (6) and the adjusting rod (1).

[0208] Figure 41It is a combined external fixator semi-ring type I structure with adjustable pressure, consisting of 2 pressure-regulating and fixing devices, a rod needle clamp (70), a rod rod clamp (71), and a semi-ring (72). The rod rod clamp (71) is connected to the adjusting shaft (1), the fixing rod (6), and the semi-ring (72). The sliding fit screw sleeve is set as the upper part (2) of the sliding fit screw sleeve and the lower part (15) of the sliding fit screw sleeve, and is tightly connected with a connecting pin (14). The pressure-regulating device is set as follows: The pressure-regulating device includes a pressure-regulating pin (38), a fixing sleeve (39), a limiting sleeve (37), and a pressure-regulating nut (40); the elastic device is a compression spring (4); the connecting mechanism between the lower part (15) of the sliding fit screw sleeve and the fixing rod (6) is set such that the lower outer wall of the lower part (15) of the sliding fit screw sleeve has a thickened cylindrical barrel wall part, and a fastening set screw (5) is radially arranged on the side wall. Two pipe clamping pins (27) radially penetrate the fixing rod (6) and are respectively matched with the upper and lower step parts of the fastening nut (26) and the lower end of the fastening nut (26); an anti-rotation pin (3) is radially arranged on the upper part of the sliding fit screw sleeve (2), and a fastening nut (7) is arranged on the outer wall of the adjusting rod (1) at the upper end of the sliding fit screw sleeve (2). A rod needle clamp (70) is arranged on the fixing rod (6) and the adjusting rod (1).

[0209] Figure 42 It is a combined external fixator ring type I structure with adjustable pressure, consisting of 3 pressure-regulating and fixing devices, 3 rings (75), a threaded rod (74), a fixing nut (73), a needle-fixing screw (76), a threaded column (77), a 2 / 3 ring (78), and a fastening bolt (79). The pressure-regulating and fixing devices are located between the lower 2 rings (75) and the upper ring (75). The upper or lower ring (75) is connected to the ring (75) with a threaded rod. The sliding fit screw sleeve is set as the upper part (2) of the sliding fit screw sleeve and the lower part (15) of the sliding fit screw sleeve, and is tightly connected with a connecting pin (14). The pressure-regulating device is set as follows: The pressure-regulating device includes a pressure-regulating pin (38), a fixing sleeve (39), a limiting sleeve (37), and a pressure-regulating nut (40); the elastic device is a compression spring (4); the connecting mechanism between the lower part (15) of the sliding fit screw sleeve and the fixing rod (6) is set such that the lower outer wall of the lower part (15) of the sliding fit screw sleeve has a thickened cylindrical barrel wall part, and a fastening set screw (5) is radially arranged on the side wall. Two pipe clamping pins (27) radially penetrate the fixing rod (6) and are respectively matched with the upper and lower step parts of the fastening nut (26) and the lower end of the fastening nut (26); an anti-rotation pin (3) is radially arranged on the upper part of the sliding fit screw sleeve (2), and a fastening nut (7) is arranged on the outer wall of the adjusting rod (1) at the upper end of the sliding fit screw sleeve (2). The lower end of the fixing rod (6) and the inner wall of the upper end of the adjusting rod (1) are threaded, and are tightly connected to the ring (75) with a fastening bolt (79).

[0210] Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can also be implemented by other structures. There are various forms of the structures of each part, and they can be combined into various forms of adjustable pressure fixing devices, which can be combined with knitting needle clamps, stick clamps, fixing rods, fixing arms, semi-rings, and full rings to form various adjustable pressure external fixation brackets such as single-arm type, semi-ring type, and full-ring type. Therefore, the features of the present invention are not limited to the above preferred embodiments. Any changes or modifications that can be easily thought of by those familiar with the technology within the technical field of the present invention should be covered within the scope of the patent protection of the present invention.

Claims

1. An adjustable pressure fixation device for orthopedic clinical applications, the adjustable pressure fixation device comprising: Adjusting rod, sliding fit screw sleeve, elastic device, fixing rod and fixing structure for fixing the adjusting rod, characterized in that: Among them, The adjusting rod is a cylindrical rod with a hollow structure, the fixing rod is a cylindrical rod, the sliding fit screw sleeve is a cylindrical sleeve, and there is a thickened part of the cylindrical wall at the upper part. The inner diameter of the sliding fit screw sleeve is adapted to the outer diameters of the adjusting rod and the fixing rod. The upper part of the sliding fit screw sleeve sleeved on the lower part of the adjusting rod, and the lower part of the sliding fit screw sleeve sleeved on the upper part of the fixing rod; Among them, The adjusting rod can be finely adjusted in the axial direction relative to the sliding fit screw sleeve, but cannot rotate relative to it; A fastening set screw (5) is radially arranged at the lower part of the sliding fit screw sleeve (2). The fastening set screw (5) is screwed in and abuts against the plane provided on the outer wall of the upper part of the fixing rod (6), preventing the fixing rod (6) from rotating and moving up and down in the horizontal direction relative to the sliding fit screw sleeve (2); The elastic device provides an elastic force during the up and down fine adjustment of the adjusting rod in the axial direction; The fixing structure of the adjusting rod is used to fix the adjusting rod and limit the axial sliding of the adjusting rod; A one-way pressure regulating device is arranged on the sliding fit screw sleeve body, and a pressure scale is arranged on the outer wall of the sliding fit screw sleeve. The specific structure of the one-way pressure regulating device is as follows: The spring is located outside the cylindrical wall of the sliding fit screw sleeve. A retaining spring pin and a pressure regulating pin are arranged below the adjusting rod. The sliding fit screw sleeve is radially provided with long holes adapted to the retaining spring pin and the pressure regulating pin. Fixing sleeves and limiting sleeves are respectively arranged at both ends of the retaining spring pin, and fixing sleeves and limiting sleeves are respectively arranged at both ends of the pressure regulating pin. The upper end of the retaining spring pin abuts against the lower end of the adjusting rod. The outer wall of the sliding fit screw sleeve is provided with threads, and a pressure regulating nut is arranged outside the cylindrical wall of the sliding fit screw sleeve. The upper end of the pressure regulating nut abuts against the lower ends of the fixing sleeve and the limiting sleeve. The spring is a compression spring sleeved outside the cylindrical wall of the sliding fit screw sleeve, with the upper end abutting against the lower end of the fixing sleeve of the retaining spring pin and the lower end abutting against the upper end of the limiting sleeve of the pressure regulating pin.

2. An adjustable pressure fixation device for orthopedic clinical applications, the adjustable pressure fixation device comprising: Adjusting rod, sliding fit screw sleeve, elastic device, fixing rod and fixing structure for fixing the adjusting rod, characterized in that: Among them, The adjusting rod is a cylindrical rod with a hollow structure, the fixing rod is a cylindrical rod, the sliding fit screw sleeve is a cylindrical sleeve, and there is a thickened part of the cylindrical wall at the upper part. The inner diameter of the sliding fit screw sleeve is adapted to the outer diameters of the adjusting rod and the fixing rod. The upper part of the sliding fit screw sleeve sleeved on the lower part of the adjusting rod, and the lower part of the sliding fit screw sleeve sleeved on the upper part of the fixing rod; Among them, The adjusting rod can be finely adjusted in the axial direction relative to the sliding fit screw sleeve, but cannot rotate relative to it; A fastening set screw (5) is radially arranged at the lower part of the sliding fit screw sleeve (2). The fastening set screw (5) is screwed in and abuts against the plane provided on the outer wall of the upper part of the fixing rod (6), preventing the fixing rod (6) from rotating and moving up and down in the horizontal direction relative to the sliding fit screw sleeve (2); The elastic device provides an elastic force during the up and down fine adjustment of the adjusting rod in the axial direction; The fixing structure of the adjusting rod is used to fix the adjusting rod and limit the axial sliding of the adjusting rod; A one-way pressure regulating device is arranged on the sliding fit screw sleeve body, and a pressure scale is arranged on the outer wall of the sliding fit screw sleeve. The specific structure of the one-way pressure regulating device is one of the following: (f), The pressure regulating device includes a pressure regulating pin, a fixed sleeve, and a limit sleeve; the sliding fit screw sleeve is radially provided with a pressure regulating pin hole that penetrates both sides, and the axial length of the pressure regulating pin hole is greater than the transverse width; the fixed sleeve is slidably sleeved on the outer wall of the sliding fit screw sleeve, and the fixed sleeve is radially provided with a through circular hole; the pressure regulating pin radially penetrates the pressure regulating pin hole of the sliding fit screw sleeve and the pressure regulating pin hole of the fixed sleeve, the pressure regulating pin is in interference fit with the adjusting rod, the fixed sleeve is in interference fit with the pressure regulating pin, the inner diameter of the barrel mouth of the limit sleeve is smaller than the inner diameter of the lower part, it is located outside the fixed sleeve and is in interference fit with the fixed sleeve, the fixed sleeve and the limit sleeve are slidably matched with the sliding fit screw sleeve; the spring is a compression spring sleeved under the adjusting rod, the lower end abuts against the pressure regulating pin, the inner diameter of the upper barrel wall of the sliding fit screw sleeve is small, and the inner diameter of the lower barrel wall is large, and the upper end of the spring abuts against the step provided on the inner wall of the sliding fit screw sleeve in the natural state; (g), The pressure regulating device includes a pressure regulating pin, a fixed sleeve, and a limit sleeve; the sliding fit screw sleeve is radially provided with a pressure regulating pin hole that penetrates both sides, and the axial length of the pressure regulating pin hole is greater than the transverse width; the fixed sleeve is slidably sleeved on the outer wall of the sliding fit screw sleeve, and the fixed sleeve is radially provided with a through circular hole; the pressure regulating pin radially penetrates the pressure regulating pin hole of the sliding fit screw sleeve and the pressure regulating pin hole of the fixed sleeve, the pressure regulating pin is in interference fit with the adjusting rod, an anti-rotation pin and an anti-rotation pin hole are provided under the adjusting rod, the spring is a compression spring sleeved under the adjusting rod, the lower end abuts against the pressure regulating pin, the inner diameter of the upper barrel wall of the sliding fit screw sleeve is small, and the inner diameter of the lower barrel wall is large, and the upper end of the spring abuts against the step provided on the inner wall of the sliding fit screw sleeve in the natural state; (h), The pressure regulating device includes a pressure regulating pin, a fixed sleeve and a limit sleeve, the sliding fit screw sleeve is radially provided with a pressure regulating pin hole that penetrates both sides, and the axial length of the pressure regulating pin hole is greater than the transverse width; the fixed sleeve is slidably sleeved on the outer wall of the sliding fit screw sleeve, and the fixed sleeve is radially provided with a through circular hole; the pressure regulating pin radially penetrates the pressure regulating pin hole of the sliding fit screw sleeve and the pressure regulating pin hole of the fixed sleeve, the pressure regulating pin is in interference fit with the adjusting rod, no anti-rotation pin and anti-rotation pin hole are provided under the adjusting rod, the spring is a compression spring sleeved on the outer wall of the sliding fit screw sleeve, the lower end abuts against the pressure regulating pin, the sliding fit screw sleeve is provided with a large outer diameter of the upper barrel wall and a small outer diameter of the lower barrel wall, and the upper end of the spring abuts against the step provided on the outer wall of the sliding fit screw sleeve in the natural state; (i), The elastic device can be set as a tension spring, which is located inside the wall of the sliding mating screw sleeve and is slidably connected to the sliding mating screw sleeve. An anti-rotation pin is provided at the lower part of the adjusting rod, and the adjusting rod is tightly fitted with the anti-rotation pin. A long groove adapted to the upper part of the tension spring is axially provided at the lower end of the adjusting rod. Fixed sleeves and limit sleeves are provided at both ends of the anti-rotation pin, and the fixed sleeves and limit sleeves are slidably connected to the sliding mating screw sleeve. A position adjusting nut is provided below the anti-rotation pin, and the position adjusting nut is threadedly connected to the sliding mating screw sleeve. An anti-rotation pin hole adapted to the anti-rotation pin is provided on the wall of the sliding mating screw sleeve, and the axial length is greater than the radial length. Rotating the position adjusting nut upward can push the fixed sleeve, limit sleeve, anti-rotation pin, and adjusting rod to move upward as a whole. Circular hooks are provided at the upper and lower ends of the tension spring. The upper hook is sleeved on the anti-rotation pin, and the lower hook is sleeved on the pressure regulating pin. Fixed sleeves and limit sleeves are provided at both ends of the pressure regulating pin, and the fixed sleeves and limit sleeves are slidably connected to the sliding mating screw sleeve. A pressure regulating nut is provided above the limit sleeve, and the lower part of the pressure regulating nut abuts against the fixed sleeve and limit sleeve. The pressure regulating nut is sleeved on the outer wall of the sliding mating screw sleeve, and the pressure regulating nut is threadedly connected to the sliding mating screw sleeve. A pressure regulating pin hole adapted to the pressure regulating pin is provided on the wall of the sliding mating screw sleeve, and the axial length is greater than the radial length. Rotating the pressure regulating nut downward can drive the fixed sleeve, limit sleeve, pressure regulating pin, and tension spring to move downward; (j), The spring is located inside the wall of the sliding mating screw sleeve. The lower part of the adjusting rod axially penetrates through the spring. The lower part of the adjusting rod is provided with a first pressure regulating pin and a second pressure regulating pin. A long hole adapted to the first pressure regulating pin is radially provided at the lower part of the adjusting rod. The second pressure regulating pin radially penetrates through the adjusting rod and is tightly connected to the adjusting rod. First fixed sleeves and first limit sleeves are respectively provided at both ends of the first pressure regulating pin, and second fixed sleeves and second limit sleeves are respectively provided at both ends of the second pressure regulating pin. Threads are provided on the outer wall of the sliding mating screw sleeve, and long holes adapted to the first pressure regulating pin and the second pressure regulating pin are radially provided. The inner diameter of the upper part of the wall of the sliding mating screw sleeve is larger than the inner diameter of the lower part of the wall. The upper part of the fixed rod is a cylindrical diameter-varying part, which is slidably mated with the inner wall of the lower part of the sliding mating screw sleeve. First pressure regulating nut and second pressure regulating nut are provided on the outer wall of the sliding mating screw sleeve. The upper end of the second pressure regulating nut abuts against the lower ends of the second fixed sleeve and the second limit sleeve, and the lower end of the first pressure regulating nut abuts against the upper ends of the first fixed sleeve and the first limit sleeve; The upper end of the spring presses against the first pressure regulating pin, and the lower end presses against the second pressure regulating pin; (k), The spring is located outside the wall of the sliding mating screw sleeve. The lower part of the adjusting rod is provided with a first pressure regulating pin and a second pressure regulating pin. A long hole adapted to the first pressure regulating pin is radially provided at the lower part of the adjusting rod. The second pressure regulating pin radially penetrates through the adjusting rod and is tightly connected to the adjusting rod. First fixed sleeves and first limit sleeves are respectively provided at both ends of the first pressure regulating pin, and second fixed sleeves and second limit sleeves are respectively provided at both ends of the second pressure regulating pin. Threads are provided on the outer wall of the sliding mating screw sleeve, and long holes adapted to the first pressure regulating pin and the second pressure regulating pin are radially provided. First pressure regulating nut and second pressure regulating nut are provided on the outer wall of the sliding mating screw sleeve. The upper end of the second pressure regulating nut abuts against the lower ends of the second fixed sleeve and the second limit sleeve, and the lower end of the first pressure regulating nut abuts against the upper ends of the first fixed sleeve and the first limit sleeve; The upper end of the spring presses against the first pressure regulating pin, and the lower end presses against the second pressure regulating pin.

3. An adjustable pressure fixation device for orthopedic clinical applications, the adjustable pressure fixation device comprising: The fixed structure of the adjusting rod, sliding mating screw sleeve, elastic device, fixed rod and fixed adjusting rod is characterized in that: Among them, The adjusting rod is a cylindrical rod with a hollow structure, the fixed rod is a cylindrical rod, the sliding and mating screw sleeve is a cylindrical sleeve, and a thickened part of the cylindrical barrel wall is provided at the upper part. The inner diameter of the sliding and mating screw sleeve is adapted to the outer diameters of the adjusting rod and the fixed rod. The lower part of the adjusting rod is sleeved by the upper part of the sliding and mating screw sleeve, and the upper part of the fixed rod is sleeved by the lower part of the sliding and mating screw sleeve; wherein, The adjusting rod can be finely adjusted in the axial direction relative to the sliding and mating screw sleeve, but cannot rotate relatively; A fastening set screw (5) is radially arranged at the lower part of the sliding and mating screw sleeve (2). The fastening set screw (5) is screwed in and abuts against the plane provided on the outer wall of the upper part of the fixed rod (6) to prevent the fixed rod (6) from rotating and moving up and down in the horizontal direction relative to the sliding and mating screw sleeve (2); The elastic device provides an elastic force during the axial up and down fine adjustment of the adjusting rod; The fixing structure of the adjusting rod is used to fix the adjusting rod and limit the axial sliding of the adjusting rod; A two-way pressure regulating device is provided on the cylinder body of the sliding and mating screw sleeve to regulate the pressure upward and downward. A pressure scale is provided on the outer wall of the sliding and mating screw sleeve. The specific structure of the two-way pressure regulating device is one of the following ways: (a) The first spring (4) is located inside the cylinder wall of the sliding and mating screw sleeve (2). The lower part of the adjusting rod (1) axially penetrates through the first spring (4). The first pressure regulating pin (62) and the second pressure regulating pin (38) are radially arranged at the lower part of the adjusting rod (1). Long holes adapted to the first pressure regulating pin (62) and the second pressure regulating pin (38) are respectively arranged radially, and the axial length is greater than the radial length. The first fixing sleeve (39) and the first limiting sleeve (37) are arranged at both ends of the second pressure regulating pin (38). The second fixing sleeve (61) and the second limiting sleeve (63) are respectively arranged at both ends of the first pressure regulating pin (62). Threads are provided on the outer wall of the cylinder wall of the sliding and mating screw sleeve (2), and long holes adapted to the first pressure regulating pin (62) and the second pressure regulating pin (38) are arranged radially. The inner diameter of the lower cylinder wall of the sliding and mating screw sleeve (2) is larger than the inner diameter of the upper cylinder wall. The first pressure regulating nut (60) and the second pressure regulating nut (40) are provided on the outer wall of the cylinder wall of the sliding and mating screw sleeve (2). The upper end of the second pressure regulating nut (40) abuts against the lower ends of the first fixing sleeve (39) and the first limiting sleeve (37), and the lower end of the first pressure regulating nut (60) abuts against the upper ends of the second fixing sleeve (61) and the second limiting sleeve (63); A pressure scale is provided on the outer wall of the sliding and mating screw sleeve (2); (b) The second spring (47) is located outside the barrel wall of the sliding fit sleeve (2). The lower part of the adjusting rod (1) is radially provided with a first pressure regulating pin (62) and a second pressure regulating pin (38), and long holes adapted to the first pressure regulating pin (62) and the second pressure regulating pin (38) are respectively provided radially. The two ends of the second pressure regulating pin (38) are respectively provided with a first fixing sleeve (39) and a first limiting sleeve (37), and the two ends of the first pressure regulating pin (62) are respectively provided with a second fixing sleeve (61) and a second limiting sleeve (63). The barrel wall of the sliding fit sleeve (2) is provided with threads outside, and long holes adapted to the first pressure regulating pin (62) and the second pressure regulating pin (38) are provided radially. A first pressure regulating nut (60) and a second pressure regulating nut (40) are provided outside the barrel wall of the sliding fit sleeve (2). The upper end of the second pressure regulating nut (40) abuts against the lower ends of the first fixing sleeve (39) and the first limiting sleeve (37), and the lower end of the first pressure regulating nut (60) abuts against the upper ends of the second fixing sleeve (61) and the second limiting sleeve (63); A pressure scale is provided on the outer wall of the sliding fit sleeve (2); The two ends of the second spring (47) respectively abut against the first pressure regulating pin (62) and the second pressure regulating pin (38); (c) The elastic device is set as a first spring (4) and a third spring (65), which can be pressure-regulated in both upward and downward directions for the adjusting rod (1). The first spring (4) is located inside the barrel wall of the sliding fit sleeve (2). The lower part of the adjusting rod (1) axially penetrates through the first spring (4). The lower part of the adjusting rod (1) is radially provided with a first pressure regulating pin (62) and a retaining spring pin (64), and a long hole adapted to the first pressure regulating pin (62) is provided radially. The two ends of the first pressure regulating pin (62) are respectively provided with a first fixing sleeve (61) and a first limiting sleeve (63). The retaining spring pin (64) radially penetrates through the adjusting rod (1) and is fixedly connected to the adjusting rod (1). In the natural state, the upper end of the first spring (4) abuts against the first pressure regulating pin (62), and the lower end abuts against the retaining spring pin (64). The third spring (65) is located inside the barrel wall of the sliding fit sleeve (2). The second pressure regulating pin (38) radially penetrates through the barrel wall of the sliding fit sleeve (2), and the two ends are respectively provided with a second fixing sleeve (39) and a second limiting sleeve (37). In the natural state, the upper end of the third spring (65) abuts against the retaining spring pin (64), and the lower end abuts against the second pressure regulating pin (38). The barrel wall of the sliding fit sleeve (2) is provided with threads outside, and long holes adapted to the first pressure regulating pin (62), the second pressure regulating pin (38), and the retaining spring pin (64) are provided radially. The inner diameter of the upper part of the barrel wall of the sliding fit sleeve (2) is larger than the inner diameter of the lower part. The upper part of the fixing rod (6) is a cylindrical diameter-varying part, which is in sliding fit with the inner wall of the lower part of the sliding fit sleeve (2). A first pressure regulating nut (60) and a second pressure regulating nut (40) are provided outside the barrel wall of the sliding fit sleeve (2). The upper end of the second pressure regulating nut (40) abuts against the lower ends of the second fixing sleeve (39) and the second limiting sleeve (37), and the lower end of the first pressure regulating nut (60) abuts against the upper ends of the first fixing sleeve (61) and the first limiting sleeve (63); A pressure scale is provided on the outer wall of the sliding fit sleeve (2); (d), the elastic device is set as the second spring (47) and the fourth spring (66), which can provide pressure regulation in both upward and downward directions for the adjusting rod (1). The second spring (47) and the fourth spring (66) are both located outside the barrel wall of the sliding fit nut (2). The adjusting rod (1) axially penetrates through the second spring (47) and the fourth spring (66). Anti-rotation pins (3) and retaining ring pins (64) are radially provided at the lower part of the adjusting rod (1). A long hole adapted to the anti-rotation pin (3) is radially provided on the adjusting rod (1), and the axial length is greater than the radial length. The anti-rotation pin (3) is fixedly connected to the sliding fit nut (2). The retaining ring pin (64) radially penetrates the adjusting rod (1) and is fixedly connected to the adjusting rod (1). A long hole adapted to the retaining ring pin (64) is radially provided on the sliding fit nut (2), and the axial length is greater than the radial length. A first pressure regulating nut (60) and a second pressure regulating nut (40) are provided outside the barrel wall of the sliding fit nut (2) and are threadedly connected to the sliding fit nut (2). In the natural state, the upper end of the second spring (47) abuts against the first pressure regulating nut (60), and the lower end abuts against the retaining ring pin (64). The upper end of the fourth spring (66) abuts against the retaining ring pin (64), and the lower end abuts against the second pressure regulating nut (40). Rotating the second pressure regulating nut (40) upward can drive the retaining ring pin (64) to move upward, giving an upward acting force to the adjusting rod (1). Rotating the first pressure regulating nut (60) downward can drive the retaining ring pin (64) to move downward, giving a downward acting force to the adjusting rod (1); A pressure scale is provided on the outer wall of the sliding fit nut (2); (e), the elastic device is set as 2 springs, which can provide pressure regulation in both upward and downward directions for the adjusting rod (1). The first spring (4) is located above the sliding fit nut (2). The adjusting rod (1) axially penetrates through the first spring (4). The fourth spring (66) is located outside the barrel wall of the sliding fit nut (2). The sliding fit nut (2) axially penetrates through the fourth spring (66). A pressure regulating nut (67) is provided at the upper end of the sliding fit nut (2), and its upper end is slidably connected to the adjusting rod (1). The inner wall of the lower part has threads and is threadedly connected to the sliding fit nut (2). A fastening nut (7) is provided on the adjusting rod (1) and is threadedly connected to the adjusting rod (1) to limit the sliding of the adjusting rod (1). The adjusting rod (1) is radially provided with a pressure regulating pin (68), an anti-rotation pin (3), and a retaining ring pin (64) from top to bottom. A long hole adapted to the anti-rotation pin (3) is radially provided on the adjusting rod (1), and the axial length is greater than the radial length. The anti-rotation pin (3) is fixedly connected to the sliding fit nut (2). The pressure regulating pin (68) and the retaining ring pin (64) are fixedly connected to the adjusting rod (1). A long hole adapted to the retaining ring pin (64) is radially provided on the sliding fit nut (2), and the axial length is greater than the radial length. A second pressure regulating nut (40) is provided outside the barrel wall of the sliding fit nut (2) and is threadedly connected to the sliding fit nut (2). In the natural state, the upper end of the first spring (4) abuts against the pressure regulating nut (67), and the lower end abuts against the pressure regulating pin (68). The upper end of the fourth spring (66) abuts against the retaining ring pin (64), and the lower end abuts against the second pressure regulating nut (40); A pressure scale is provided on the outer wall of the sliding fit nut (2); (f) The elastic device is set as the first spring (4) and the third spring (65), which can provide pressure regulation in both upward and downward directions for the adjusting rod (1). The first spring (4) and the third spring (65) are both located above the sliding fit nut (2). The adjusting rod (1) axially penetrates through the first spring (4), the third spring (65), and the upper end of the sliding fit nut (2) is provided with a pressure regulating nut (69), the upper end of which is slidably connected to the adjusting rod (1), and the inner wall of the lower part is provided with threads and is threadedly connected to the sliding fit nut (2). The outer wall of the pressure regulating nut (69) is provided with threads, and the upper part is provided with a pressure regulating nut (67), and the pressure regulating nut (67) is threadedly connected to the pressure regulating nut (69). The adjusting rod (1) is radially provided with a retaining spring pin (68) and an anti-rotation pin (3). The retaining spring pin (68) is fixedly connected to the adjusting rod (1). The adjusting rod (1) is radially provided with a long hole adapted to the anti-rotation pin (3), and the anti-rotation pin (3) is fixedly connected to the sliding fit nut (2). In the natural state, the upper end of the first spring (4) abuts against the pressure regulating nut (67), and the lower end abuts against the retaining spring pin (68). The upper end of the third spring (65) abuts against the retaining spring pin (68), and the lower end abuts against the pressure regulating nut (69). The outer walls of the sliding fit nut (2) and the pressure regulating nut (69) are provided with pressure gauges. (g) The elastic device can be set as the second spring (47) and the tension spring (56), which can provide pressure regulation in both upward and downward directions for the adjusting rod (1). The second spring (47) is located outside the barrel wall of the sliding fit nut (2), and the tension spring (56) is located inside the barrel wall of the sliding fit nut (2). The lower end of the adjusting rod (1) is axially provided with a long groove adapted to the upper part of the tension spring (56). The lower part of the adjusting rod (1) is radially provided with an anti-rotation pin (3) and a third pressure regulating pin (53). The adjusting rod (1) is fixedly connected to the anti-rotation pin (3) and the third pressure regulating pin (53). The fourth pressure regulating pin (57) is radially arranged on the sliding fit nut (2). The barrel wall of the sliding fit nut (2) is radially provided with long holes adapted to the anti-rotation pin (3), the third pressure regulating pin (53), and the fourth pressure regulating pin (57), and the axial length is greater than the radial length. The two ends of the fourth pressure regulating pin (57) are provided with a fixing sleeve (58) and a limiting sleeve (59). The upper and lower ends of the tension spring (56) are provided with circular hooks. The upper hook is sleeved on the third pressure regulating pin (53), and the lower hook is sleeved on the fourth pressure regulating pin (57). In the natural state, the upper end of the second spring (47) abuts against the anti-rotation pin (3), and the lower end abuts against the fixing sleeve (52) and above the limiting sleeve (51). A pressure regulating nut (54) is arranged below the third pressure regulating pin (53), and the pressure regulating nut (54) is threadedly connected to the sliding fit nut (2). The lower part of the third pressure regulating nut (55) abuts against the fixing sleeve (58) and the limiting sleeve (59). The third pressure regulating nut (55) is sleeved on the outer wall of the sliding fit nut (2). The outer wall of the sliding fit nut (2) is provided with a pressure gauge.

4. The adjustable pressure fixing device according to any one of claims 1-3, characterized in that: The specific connection method between the adjusting rod and the sliding fit nut is one of the following methods: (b) On the lower part of the adjusting rod, there are anti-rotation pin holes that penetrate through both sides. The axial length of the anti-rotation pin holes is slightly greater than the transverse width. On the upper part of the sliding fit sleeve, there are anti-rotation holes that penetrate through both sides radially. The diameter of the anti-rotation holes is adapted to the transverse width of the anti-rotation pin holes. There are two cylindrical key pins of the same size. One cylindrical key pin is inserted into one side of the anti-rotation hole and the anti-rotation pin hole, and the other cylindrical key pin is inserted into the other side of the anti-rotation hole and the anti-rotation pin hole. The diameter of the cylindrical key pin is adapted to the aperture of the anti-rotation hole. (c) On the lower part of the adjusting rod, there are anti-rotation pin holes that penetrate through both sides. The axial length of the anti-rotation pin holes is slightly greater than the transverse width. On the upper part of the sliding fit sleeve, there are anti-rotation holes that penetrate through both sides radially. The diameter of the anti-rotation holes is adapted to the transverse width of the anti-rotation pin holes. A cylindrical key pin is inserted into one side of the anti-rotation hole and the anti-rotation pin hole. The diameter of the cylindrical key pin is adapted to the aperture of the anti-rotation hole. (e) At the lower end of the adjusting rod, there is a cylindrical outer diameter enlarged part. On the outer diameter of the enlarged part, there is an anti-rotation plane. The upper barrel opening of the sliding fit sleeve is set to be smaller than the inner diameter of the barrel body. The upper barrel opening is slidably connected to the adjusting rod. On the inner wall of the upper part of the sliding fit sleeve, there is a protruding plane that slidably cooperates with the plane provided at the lower end of the adjusting rod. (f) The upper barrel opening of the sliding fit sleeve is set to be smaller than the inner diameter of the barrel body. The upper barrel opening is slidably connected to the adjusting rod. On the inner wall of the upper part of the sliding fit sleeve, there is a protruding plane. At the lower end of the adjusting rod, there is an anti-detachment sleeve, which is in the shape of a cylindrical barrel. The anti-detachment sleeve is fixedly connected to the adjusting rod with a fastening pin. On the outer wall of the anti-detachment sleeve, there is a plane that cooperates with the plane provided on the inner wall of the upper part of the sliding fit sleeve. (g) The upper barrel opening of the sliding fit sleeve is set to be smaller than the inner diameter of the barrel body. The upper barrel opening is slidably connected to the adjusting rod. On the inner wall of the upper part of the sliding fit sleeve, there is a protruding plane. At the lower end of the adjusting rod, there is an anti-detachment sleeve, which is in the shape of a cylindrical barrel. The anti-detachment sleeve is fixedly connected to the adjusting rod with a fastening set screw. On the outer wall of the anti-detachment sleeve, there is a plane that cooperates with the plane provided on the inner wall of the upper part of the sliding fit sleeve.

5. The adjustable pressure fixing device according to any one of claims 1-3, characterized in that: As a further setting of the sliding fit sleeve (2), the sliding fit sleeve is set to be in a split shape. The upper part of the sliding fit sleeve is slidably connected to the lower part of the adjusting rod. The lower part of the sliding fit sleeve is fixedly connected to the upper part of the fixed rod. The lower end of the upper part of the sliding fit sleeve and the upper end of the lower part are fixedly connected with a connecting pin.

6. The adjustable pressure fixing device according to any one of claims 1-3, characterized in that: Set a fixing structure for fixing the adjusting rod to limit the axial sliding of the adjusting rod. Its specific structure is one of the following ways: (a) On the outer wall of the adjusting rod at the upper end of the sliding fit sleeve, there is a fastening nut. The inner wall of the fastening nut is threaded and is threadedly connected to the adjusting rod. Adjust the fastening nut downward, and its lower end abuts against the upper end of the sliding fit sleeve, and the adjusting rod can be fixed. (c) On the outer wall of the adjusting rod at the upper end of the sliding fit sleeve, there is a limiting sleeve, and the limiting sleeve is fixedly connected to the adjusting rod with a fastening set screw. (d) On the outer wall of the adjusting rod at the upper end of the sliding fit sleeve, there is a limiting clamp block. One end of the limiting clamp block is axially provided with a round hole that slidably cooperates with the adjusting rod. The other end is provided with a 2-mm-high gap and a fastening screw that communicates with the round hole in the middle. On the limiting clamp block at the head end of the fastening screw, there is a threaded hole. Tighten the fastening screw to fix the limiting clamp block to the adjusting rod. (e) A limit pin is provided on the adjusting rod at the upper end of the sliding fit bushing. The limit pin is fixedly connected to the adjusting rod. A limit bushing is provided at the upper end of the sliding fit bushing. The inner wall of the limit bushing is threadedly connected to the upper end of the sliding fit bushing, and the upper port of the limit bushing is slidably connected to the adjusting rod.

7. The adjustable pressure fixing device according to any one of claims 1-3, characterized in that: The specific connection method between the sliding fit bushing and the fixed rod is one of the following methods: (a) The upper part of the fixed rod and the lower part of the sliding fit bushing are fixedly connected by a fastening set screw. (b) The upper part of the fixed rod and the lower part of the sliding fit bushing are fixedly connected by a fastening pin. (c) The upper end of the fixed rod is threadedly connected to the lower part of the sliding fit bushing, and the fixed rod is fastened by a fastening nut. (d) The fixed rod and the sliding fit bushing are integrally formed. The upper part of the fixed rod is provided with a cylindrical diameter-increased part, presenting a cylindrical structure. (f) The outer wall of the lower part of the sliding fit bushing is provided with a cylindrical wall-thickened part. A fastening screw is radially provided. The fastening screw is threadedly connected to the lower part of the sliding fit bushing, and its head end corresponds to the step provided on the side of the upper end of the fixed rod to fix the fixed rod. The fixed rod is configured to be slidably matched with the lower part of the sliding fit bushing and the lower part of the fastening nut. Two radially penetrating pin holes are provided at different axial heights of the fixed rod. After two clamping tube pins radially penetrate the pin holes of the fixed rod, they are respectively matched with the upper and lower step parts of the fastening nut and the lower end of the fastening nut, and can drive the fixed rod to move up and down as the fastening nut moves up and down. (g) The outer wall of the lower part of the sliding fit bushing is provided with a threaded gasket, a fixed rod screw, and a fixed rod screw sliding hole. The inner wall of the threaded gasket is provided with threads and a circular hole is radially provided, which is threadedly connected to the lower part of the sliding fit bushing. The fixed rod screw radially penetrates the circular hole of the threaded gasket, and the head end of the fixed rod screw is threadedly connected to the upper part of the fixed rod. The axial diameter length of the fixed rod screw sliding hole is greater than the transverse diameter. The fixed rod is configured to be slidably matched with the lower part of the sliding fit bushing and the lower part of the fastening nut. Two radially penetrating pin holes are provided at different axial heights of the fixed rod. After two clamping tube pins radially penetrate the pin holes of the fixed rod, they are respectively matched with the upper and lower step parts of the fastening nut and the lower end of the fastening nut, and can drive the fixed rod to move up and down as the fastening nut moves up and down. (h) The outer wall of the lower part of the sliding fit bushing is provided with a threaded gasket, a fixed rod screw, a fixed rod screw sliding hole, and an adjusting nut. The inner wall of the threaded gasket is provided with threads and a circular hole is radially provided, which is threadedly connected to the lower part of the sliding fit bushing. The fixed rod screw radially penetrates the circular hole of the threaded gasket, and the head end of the fixed rod screw is threadedly connected to the upper part of the fixed rod. The axial diameter length of the fixed rod screw sliding hole is greater than the transverse diameter. The adjusting nut is threadedly connected to the lower part of the sliding fit bushing and is provided below the threaded gasket. The fixed rod is configured to be slidably matched with the lower part of the sliding fit bushing, and a screw hole adapted to the fixed rod screw is radially provided at the upper end. (i). A connecting sleeve is provided on the outer wall of the lower part of the sliding sleeve. After being threadedly connected to the sliding sleeve, it is fixedly connected with a fixing pin. The connecting sleeve is radially provided with fastening screws, and the head ends of the fastening screws correspond to the steps provided on the side surface of the upper end of the fixing rod to fix the fixing rod. The fixing rod is configured to be slidably mated with the lower part of the sliding sleeve, the lower part of the connecting sleeve, and the lower part of the fastening nut. Two radially penetrating pin holes are provided at different axial heights of the fixing rod. After two clamping tube pins radially penetrate the pin holes of the fixing rod, they are respectively mated with the upper and lower step parts of the fastening nut and the lower end of the fastening nut, and can drive the fixing rod to move up and down along with the up and down movement of the fastening nut. (j). Adjusting nuts are provided on the outer wall of the lower part of the sliding sleeve. The adjusting nuts are radially provided with sliding holes for the fixing rod pins that penetrate through both sides. The axial length of the sliding holes for the fixing rod pins is greater than the transverse width. The fixing rod is configured to be slidably mated with the lower part of the sliding sleeve, and a fixing rod pin is provided radially at the upper end. The two adjusting nuts are respectively located above and below the fixing rod pin and are threadedly connected to the lower part of the sliding sleeve, and can drive the fixing rod pin and the fixing rod to move up and down.

8. A combined external fixator with adjustable pressure for orthopedic clinical applications, characterized in that: One adjustable pressure fixing device as claimed in any one of claims 1-7 is adopted, and is combined with a knitting needle clamp block or a knitting needle clamp block, a stick clamp block, and a fixing stick to form a single-arm type adjustable pressure combined external fixator.

9. A combined external fixator with adjustable pressure for orthopedic clinical applications, characterized in that: Two adjustable pressure fixing devices as claimed in any one of claims 1-7 are adopted, and are combined with two half-rings, a stick clamp block, a knitting needle clamp block, and a fixing stick to form a half-ring type adjustable pressure combined external fixator.

10. A combined external fixator with adjustable pressure for orthopedic clinical applications, characterized in that: Three or four adjustable pressure fixing devices as claimed in any one of claims 1-7 are adopted, and are combined with four or five circular rings or 2 / 3 circular rings, threaded rods, fixing nuts, needle-fixing screws, threaded columns, and fastening bolts to form a ring type adjustable pressure combined external fixator.

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