Static-dynamic fixation bone fracture plate

Abstract

The invention relates to a static-dynamic fixation bone fracture plate, which belongs to a medical fracture internal fixation bone fracture plate and is characterized in that any one to four of a high-thread screw, an elastic plate, a conical bulge and an absorbable cushion block are selected to be combined for use according to different fracture parts. The elastic plate is in a shoulder pole shape and is of a low-stress shielding structure between high-thread screw holes. The thread of the high-thread screw has the design of cutting bones, preventing fracture caused by stress concentration and micro-motion; the conical bulge has the effects of suspended fixation of fracture and gradually-changed low-stress shielding; the absorbable cushion block is degraded and absorbed, so that the stress shielding effect of the screw is gradually reduced. The device has the advantages that each component has the function of reducing stress shielding of the bone fracture plate to bones, static-dynamic automatic conversion fixation can be achieved, permutation and combination of different components have different degrees and functions, multiple component structures are compounded, complementation and reinforcement functions are achieved, the micro-motion effect of dynamic fixation is more reliable, and rapid fracture rehabilitation is achieved.

Description

Technical Field

[0001] The invention belongs to the field of clinical fracture internal fixation bone fracture plate, and particularly relates to a static-dynamic fixation bone fracture plate, that is, a bone fracture plate which automatically changes from static fixation to dynamic fixation. Background Art

[0002] The combination of ordinary fixation plates and ordinary threaded screws is the mainstream method of existing fracture fixation, in which the structure is: both surfaces of the fixation plate are flat, and a number of screw holes are provided on the fixation plate, and threaded screws are inserted into the screw holes for fracture fixation. There are many complications with this structure of fixation, among which stress shielding is one of the most important complications. The strength of fixation plates and threaded screws is usually higher than that of bones. During the fracture healing process, they will bear most of the stress, reducing the stress on the bones. This may lead to osteoporosis and other conditions in the bones around the fracture site, affecting the complete healing of the fracture. After the internal fixation device is removed, the local bones may be prone to fracture again due to reduced strength.

[0003] Bones have an important physiological characteristic. When bones are subjected to continuous compression, the bone tissue in the compressed area will be absorbed. Appropriate intermittent stress stimulation will promote bone formation and remodeling. The formation of any bone shape is the result of mechanical action.

[0004] Stress shielding can affect fracture healing and delay fracture healing. Under normal circumstances, bone tissue needs to withstand an appropriate amount of intermittent stress stimulation to promote bone formation and remodeling during fracture healing. When stress shielding exists, the stress on the bone is reduced, and the bone tissue lacks sufficient mechanical stimulation, which will interfere with the natural process of fracture healing. Callus formation may slow down, and the connection and stabilization time of the fracture ends will be prolonged.

[0005] Stress shielding affects the growth of bone cells and inhibits the activity of bone cells. Bone cells can sense mechanical stimuli and regulate their own metabolism and function through a series of signal transduction pathways. Stress shielding reduces the stress felt by bone cells, inhibits the activity of bone cells, reduces the ability of bone cells to synthesize bone matrix, and relatively enhances the activity of bone cells, resulting in increased bone absorption, reduced bone formation, and changes in the morphology and distribution of bone cells. Under normal stress conditions, bone cells are arranged in a certain order. Stress shielding can change the morphology and distribution of bone cells, and bone cells may be disordered in arrangement and reduced in density. This further affects the normal structure and function of bone tissue. After fracture fixation using existing methods, the stress shielding generated by the internal fixator will affect the smooth healing of the fracture, leading to serious complications such as delayed healing or non-healing.

[0006] In recent years, the role of the mechanical environment in fracture healing has been paid more attention. It is generally believed that the longitudinal stress of the fracture is an important mechanical environment to promote fracture healing, and shear stress (shear, bending and rotational stress) is an important factor affecting fracture healing. However, after 27 years of research, we found that shear stress can also promote fracture healing like longitudinal stress, which subverts the previous industry cognition.

[0007] Based on the physiological characteristics of bones, according to our research findings that "shear stress can promote fracture healing just like longitudinal stress", relying on our proposed fracture microenvironment theory and the dual micro-fixation theory of minimally invasive micro-stress shielding, as well as the defects of the above various stress shielding factors on fracture healing, it is necessary to design a fracture internal fixation static-dynamic automatic transformation fixation plate that reduces the complications caused by stress shielding of bones by existing fixation plates, and uses the synergistic effect of shear stress and longitudinal stress to promote fracture healing. Summary of the invention

[0008] The purpose of the present invention is to overcome the above-mentioned defects, and based on our discovery that shear stress can promote fracture healing just like longitudinal stress and the physiological characteristics of bones, relying on the fracture microenvironment theory and minimally invasive micro-stress shielding (double micro) fixation theory we proposed, provide a static-dynamic fixation plate, which reduces the stress shielding effect of the fixed bone plate on the bone through high-thread screws, elastic plates, conical protrusions and absorbable pads, realizes the automatic transformation of fracture fixation from static fixation to dynamic fixation, and thus achieves rapid recovery of fracture patients.

[0009] The objective of the present invention is achieved through the following technical solutions: A static-dynamic fixation bone plate, comprising a fixed steel plate, characterized in that: it also comprises a high-thread screw, the high-thread screw is composed of a double-thread segment close to the tip, a single-thread segment away from the tip and a nut at the top, the taper formed by the thread bottom diameter of the single-thread segment and the axial centerline of the screw decreases from top to bottom, the thread bottom diameter of the double-thread segment and the taper of the axial centerline of the screw are the same from top to bottom, the diameter of the high-thread screw is 1.0-6.0 mm, and the thread distance of the single-thread segment is twice the thread distance of the double-thread segment. The thread distance of the double thread section is 1-4mm, the thread bottom width is 0.3-3mm, the outer periphery of the nut is provided with a locking thread, the thread cross-section of the high thread screw is a triangular cross-section, and the fixed steel plate is provided with a plurality of screw holes that penetrate the fixed steel plate. The screw holes are mirrored along the axial direction of the fixed steel plate with the midpoint as the mirror image, and each screw hole is composed of a pressure side half hole and a pressure-free side screw locking half hole that are relatively arranged along the axial direction of the fixed steel plate. The pressure-free side screw locking half hole is provided with a locking thread, and the high thread screw passes through the pressure-free side screw locking half hole and is locked with the fixed steel plate.

[0010] The static-dynamic fixation bone fracture plate also includes an absorbable pad. The absorbable pad is embedded in the pressure-side half hole and is pressed against the locking thread on the high-thread screw nut to participate in the locking of the high-thread screw and the fixed steel plate.

[0011] A plurality of cone-shaped protrusions are arranged around the screw holes on the bone surface side of the fixing steel plate.

[0012] The fixed steel plate is replaced by an elastic plate, which is 1 / 5-1 / 3 tubular, and the elastic plate consists of a middle part and outer parts connected to the middle part on both sides respectively, and the outer parts on both sides gradually narrow and become thinner from the junction of the middle part and the outer parts to the two sides laterally, and the elastic plate is provided with a plurality of screw holes that penetrate the elastic plate, and the screw holes are arranged with the midpoint as a mirror image along the axial direction of the elastic plate, and each screw hole consists of a pressure side half hole and a pressure-free side screw locking half hole that are relatively arranged along the axial direction of the elastic plate, and a locking thread is arranged in the pressure-free side screw locking half hole, and a boss is arranged around the screw hole on the proximal bone surface side of the elastic plate, and spherical depressions facing the distal bone surface side are relatively arranged on both sides of the proximal bone surface side of the elastic plate, and an arched surface is longitudinally provided on the proximal bone surface side of the elastic plate, and the spherical depression and the arched surface are located between each screw hole, and the high-thread screw passes through the pressure-free side screw locking half hole and is locked with the elastic plate.

[0013] The boss is provided with a plurality of conical protrusions.

[0014] The static-dynamic fixation bone fracture plate also includes an absorbable pad, which is embedded in the pressure-side half hole and squeezed with the locking thread of the high-thread screw nut to participate in the locking of the high-thread screw and the elastic plate.

[0015] The high-thread screw is replaced by a cortical bone screw, which passes through the screw locking half hole on the non-pressure side and is locked with the elastic plate.

[0016] The boss is provided with a plurality of conical protrusions.

[0017] The static-dynamic fixation bone plate also includes an absorbable pad, which is embedded in the pressure-side half-hole of the screw hole on the distal bone side of the elastic plate. The cortical bone screw passes through the non-pressure-side screw locking half-hole and is locked with the elastic plate. The absorbable pad is squeezed with the locking thread of the cortical bone screw nut to participate in the locking of the cortical bone screw and the elastic plate.

[0018] The high-thread screw is replaced by a cortical bone screw, and an absorbable pad is embedded in the pressure-side half hole on the fixing plate. The cortical bone screw passes through the non-pressure-side screw locking half hole and is locked with the fixing plate. The absorbable pad is squeezed with the locking thread on the cortical bone screw nut to participate in the locking of the cortical bone screw and the fixing plate.

[0019] The high-thread screw is replaced by a cortical bone screw, and a plurality of conical protrusions are arranged around the screw hole on the near-bone surface side of the fixing plate. The cortical bone screw passes through the screw locking half hole on the pressure-free side and is locked with the fixing plate.

[0020] The static-dynamic fixation bone fracture plate also includes an absorbable pad, which is embedded in the pressure-side half hole on the fixation plate. The absorbable pad is squeezed by the locking thread on the cortical bone screw nut to participate in the locking of the cortical bone screw and the fixation plate.

[0021] The beneficial effects of the present invention are: 1. Since bone absorption is caused by continuous compression, which is a physiological characteristic of bones, high-thread screws continuously cut and compress bones through high-thread blades, so that the bones are automatically absorbed, causing the high-thread screws to move in the direction of bone absorption, thereby achieving tiny movements, and then achieving early static fixation, and automatically achieving dynamic fixation in the later stage.

[0022] 2. The two ends of the elastic plate gradually narrow and become thinner from the middle connecting end to the two ends, and the overall shape is a "pole" shape, which can cause elastic strain of the elastic plate and reduce the stress shielding of the elastic plate to the bone. The spherical depression and arched surface of the elastic plate on the bone side exist between each threaded screw hole, which can also cause elastic strain of the elastic plate and reduce the stress shielding of the elastic plate to the bone.

[0023] 3. An absorbable pad is embedded in the pressure-side half of the high-thread screw hole. After implantation, it expands to enhance early static fixation. As the material of the absorbable pad in the high-thread screw hole degrades and absorbs, the high-thread screw moves progressively, reducing the stress shielding of the bone plate on the bone, and gradually becomes dynamic fixation, thereby achieving a static-dynamic conversion function.

[0024] 4. The side of the elastic plate near the bone, that is, the side in contact with the bone, is raised with a cone-shaped protrusion, so that the elastic plate is suspended on the bone surface. At this time, it is like an external fixator on the bone surface, which produces better elasticity. Because it is a physiological characteristic of bones to be subjected to continuous pressure and cause bone absorption, as the cone-shaped protrusion continues to compress the bone surface and cause bone absorption, the strong fixation of the fracture is weakened, reducing the stress shielding effect of the bone plate on the bone.

[0025] 5. Through the simultaneous action of high-thread screws, elastic plates, conical protrusions and absorbable pads, they complement and cooperate with each other, creating a static-dynamic automatic conversion structure with better and safer fracture fixation, achieving micro-movement from static fixation to dynamic fixation automatically, thereby promoting rapid recovery of fractures. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the present invention.

[0027] Figure 2 Front view of the present invention.

[0028] Figure 3 It is a bottom view of the present invention.

[0029] Figure 4 It is a schematic diagram of the top view structure of the elastic plate of the present invention.

[0030] Figure 5 It is a bottom view of the structure of the elastic plate of the present invention.

[0031] Figure 6 It is a schematic diagram of the structure of the high thread screw of the present invention.

[0032] in: 1-high thread screw, 2-elastic plate, 3-absorbable spacer, 4-screw locking half hole on the non-pressure side, 5-half hole on the pressure side, 6-boss, 7-conical protrusion, 8-spherical depression, 9-arched convex surface, 10-nut, 11-single thread segment, 12-middle part, 13-outer part, 14-screw hole, 15-double thread segment. DETAILED DESCRIPTION

[0033] When the static-dynamic fixation plate is used for fracture fixation, according to different fracture sites, any one, two or three or four of the high-thread screws, elastic plates, conical protrusions and absorbable pads can be selected and used in combination. Each component has a stress shielding function of reducing the stress of the plate on the bone to varying degrees and properties, and can achieve automatic static-dynamic conversion fixation. The arrangement and combination of different components have different degrees and functions. The composite structure of multiple components has complementary and reinforcing functions, and the micro-motion effect of dynamic fixation achieved is more reliable, so as to achieve rapid recovery of fractures.

[0034] in: The high thread screw 1 is made of biological internal fixation materials such as titanium alloy, nickel-titanium alloy, copper-containing titanium alloy, cobalt-molybdenum alloy, etc. These materials have good biocompatibility and have been widely used in clinical practice. The high thread screw 1 is composed of a double thread section 15 close to the tip, a single thread section 11 away from the tip and a nut 10 at the top. The taper formed by the thread bottom diameter of the single thread section 11 and the axial centerline of the screw decreases from top to bottom to prevent stress concentration, reduce stress shielding, and prevent the occurrence of broken nails. The thread bottom diameter of the double thread section and the taper of the axial centerline of the screw are the same from top to bottom. The diameter of the high thread screw is 1.0-6.0mm, the thread distance of the single thread section 16 is twice the thread distance of the double thread section, the thread distance of the double thread section is 1-4mm, the thread bottom width is 0.3-3mm, the outer periphery of the nut is provided with a locking thread, the thread cross section of the high thread screw is a triangular cross section, the double thread section 15 can slow down the descending speed of bone cutting, because the elastic plate or the fixed steel plate is eccentrically fixed, and the double thread section is used to slow down the cutting speed of the tip of the high thread screw that moves too fast.

[0035] The elastic plate 2 is made of titanium alloy, nickel-titanium alloy, copper-containing titanium alloy, cobalt-molybdenum alloy and polyether-ether-ketone and other biomaterials, which have good biocompatibility and have been widely used in clinical practice. The elastic plate 2 is 1 / 5-1 / 3 tubular, 20-300mm long, 5-30mm wide and 0.3-5.0mm thick. The elastic plate 2 is composed of a middle part 12 and lateral parts 13 on both sides. The middle part 12 is used to fix the fracture site. The lateral parts 13 on both sides gradually narrow and become thinner from the junction of the middle part 12 and the lateral parts 13 to both sides, and are adapted to the anatomical morphology of the fixed site. The overall shape is similar to a "pole" shape, which is also to reduce the stress shielding of the elastic plate 2 on the bone. The elastic plate 2 is provided with a plurality of screw holes 14 penetrating the elastic plate 2, and the screw holes 14 are arranged along the axial direction of the elastic plate 2 with the midpoint as a mirror image, and each screw hole 14 is an oblong hole composed of a pressure-side half hole 5 and a pressure-free side screw locking half hole 4 arranged opposite to each other along the axial direction of the elastic plate 2, and the diameter of the oblong hole is 3.0-8.0 mm, the pressure-side half hole 5 in the screw hole 14 on one side of the elastic plate 2 is located on the left side of the oblong hole, the pressure-free side screw locking half hole 4 is located on the right side of the oblong hole, and the pressure-side half hole 5 in the screw hole on the other side is located on the right side of the oblong hole The pressure-free side screw locking half hole 4 is located on the left side of the long elliptical hole, and a locking thread is arranged in the pressure-free side screw locking half hole 4. The distal bone surface side of the elastic plate 2 is a smooth surface, and the high-thread screw hole 14 on the proximal bone surface side is an oblong hole with a diameter of 2.0-8.0 mm. A boss 6 is arranged around the screw hole 14 on the proximal bone surface side, and the boss 6 is 1-5 mm high. Spherical depressions 8 facing the distal bone surface are arranged on both sides of the proximal bone surface elastic plate 2 between each screw hole 14, and an arched surface 9 is arranged longitudinally. This structure is to reduce the stress shielding of the bone by the elastic plate 2.

[0036] The conical protrusion 7 is arranged on the proximal bone surface side of the elastic plate 2 or the fixed steel plate, that is, on the boss 6 on the surface in contact with the bone. The height of the protrusion 7 is 0.5-4.0mm and the bottom diameter is 0.5-3.0mm. The conical protrusion 7 raises the elastic plate 2 or the fixed steel plate so that the elastic plate 2 or the fixed steel plate is suspended on the bone surface. At this time, the elastic plate 2 or the fixed steel plate is like an external fixation bracket on the bone surface, which can produce better elasticity. As the conical protrusion 7 continues to compress and absorb the bone, the strong fixation of the fracture gradually weakens, reducing the stress shielding effect of the bone plate on the bone.

[0037] The material of the absorbable pad is an organic biomaterial, such as polylactic acid, whose degradation products are carbon dioxide and water, and it has been widely used clinically. It can also be a metal alloy biomaterial, such as magnesium-based alloy, etc. These materials have good biocompatibility. A notch is provided on one side of the absorbable pad 3, which is embedded in the pressure-side half hole 5, and matches the locking thread on the high-thread screw 1 or the cortical bone screw nut. During the locking process, the two squeeze each other. After implantation in the body, the absorbable pad 3 expands to enhance the early static fixation. As the material of the absorbable pad 3 in the screw hole 14 degrades and absorbs, the high-thread screw 1 or the cortical bone screw moves progressively, reducing the stress shielding of the bone plate on the bone, and gradually becomes dynamic fixation, thereby achieving the static-dynamic conversion function.

[0038] The cortical bone screws are those commonly used in clinical practice, and their structure will not be described in detail here.

[0039] Embodiment 1: As shown in the figure, a static-dynamic fixation bone plate is used to fix fractures of upper limb bones including clavicle, scapula, humerus, ulna and metacarpal phalanges. The currently clinically used cortical bone screws are used in combination with the pole-shaped elastic plate 2 of the present application. The pole-shaped elastic plate 2 generates low stress shielding during fracture fixation. The cortical bone screw passes through the pressure-free side screw locking half hole 4 in the screw hole 14 on the elastic plate 2 to lock the elastic plate 2 at the fracture site. Because the upper limb bones are non-weight-bearing bones and are subject to shear (including shearing, bending and rotation) stresses most of the time, the elastic plate 2 can reduce shear stress shielding.

[0040] Embodiment 2: As shown in the figure, a static-dynamic fixation bone plate is used to fix fractures of the lower limbs including the femur, tibia, fibula and metatarsal phalanges or upper limb bones. A high-thread screw 1 and an elastic plate 2 are selected to cooperate. The high-thread screw 1 is used to pass through the pressure-free side screw locking half hole 4 in the screw hole 14 to lock the elastic plate 2 at the fracture site. The overall shape of the elastic plate 2 is similar to a "pole" shape, which reduces the stress shielding of the elastic plate 2 on the bones. The spherical concave 8 and the arched surface 9 structure between the screw holes 14 on the proximal bone surface of the elastic plate 2 are to reduce the stress shielding of the elastic plate 2 on the bones. Because the high-thread screw 1 and the elastic plate 2 cooperate to reduce the longitudinal and shear stress shielding effect, the lower limb bones are weight-bearing bones and mainly bear longitudinal stress, and the upper limb bones are non-weight-bearing bones and are subject to shear stress most of the time. The high-thread screw 1 and the elastic plate 2 can reduce the longitudinal stress shielding and the shear stress shielding.

[0041] Embodiment 3: As shown in the figure, a static-dynamic fixation bone plate is used to fix lower limb bone fractures. On the basis of Embodiment 2, an absorbable pad 3 is embedded in the pressure-side half hole 5 in the screw hole 14 on the distal bone side of the elastic plate 2. The absorbable pad 3 is squeezed with the locking thread on the nut 10 of the high-thread screw 1, and participates in the locking of the high-thread screw 1 and the elastic plate 2. The high-thread screw 1 passes through the pressure-free side screw locking half hole 4 to lock the elastic plate 2 at the fracture site. The high-thread screw 1, the absorbable pad 3 and the elastic plate 2 cooperate to mainly reduce the longitudinal shielding effect, followed by shear stress shielding. The lower limb bones are weight-bearing bones, which mainly bear longitudinal stress, and the shear stress is relatively small. Therefore, this embodiment is used for the lower limb bones to reduce longitudinal stress shielding mainly, and to reduce shear stress shielding as a supplement.

[0042] Embodiment 4: A static-dynamic fixation bone plate, which is selected to cooperate with a cortical bone screw, an elastic plate 2 and an absorbable pad 3. The absorbable pad 3 is embedded in the pressure-side half hole 5 in the screw hole 14 on the distal bone side of the elastic plate 2, and is squeezed with the locking thread on the nut 10 of the cortical bone screw to participate in the locking of the cortical bone screw and the elastic plate 2. The cortical bone screw passes through the non-pressure side screw locking half hole 4 and is locked with the elastic plate 2 at the fracture site. The overall shape of the elastic plate 2 is approximately a "pole" shape, which reduces the stress shielding of the elastic plate 2 on the bone. The spherical depression 8 and the arched surface 9 structure on the proximal bone side of the elastic plate 2 are intended to reduce the stress shielding of the elastic plate 2 on the bones, and to produce low stress shielding when the fracture is fixed. This embodiment is mainly used for fractures of the lower limbs or upper limbs, because the elastic plate 2 and the absorbable pad 3 cooperate to reduce the longitudinal and shear stress shielding effect. The lower limb bones are weight-bearing bones and mainly bear longitudinal stress, while the upper limb bones are non-weight-bearing bones and are subject to shear stress most of the time. The elastic plate 2 and the absorbable pad 3 cooperate to reduce longitudinal stress shielding and shear stress shielding.

[0043] Embodiment 5: As shown in the figure, a static-dynamic fixation bone plate is used, which is matched with a cortical bone screw, an elastic plate 2, a conical protrusion 7 and an absorbable pad 3. The absorbable pad 3 is embedded in the pressure-side half hole 5 in the screw hole 14 on the distal bone side of the elastic plate 2, and participates in the extrusion of the locking thread on the nut 10 of the cortical bone screw, and participates in the locking of the cortical bone screw and the elastic plate 2. The cortical bone screw passes through the pressure-free side screw locking half hole 4 and is locked with the elastic plate 2 at the fracture site. The structure of the proximal bone side between the screw holes 14 of the elastic plate 2 and the whole form a shoulder pole shape, which produces low stress shielding when the fracture is fixed. At the same time, the conical protrusion 7 on the proximal bone side of the elastic plate 2 drills into the bone, and the conical protrusion 7 raises the elastic plate 2 so that the elastic plate 2 is suspended on the bone surface. At this time, the elastic plate 2 is like an external fixation bracket on the bone surface, which can produce better elasticity. As the conical protrusion 7 continues to compress and absorb the bone, the strong fixation of the fracture is gradually weakened, reducing the stress shielding effect of the bone plate on the bone. This embodiment is applied to fractures of lower limbs or upper limbs. The bones of lower limbs are weight-bearing bones and mainly bear longitudinal stress, while the bones of upper limbs are non-weight-bearing bones and are subject to shear stress most of the time. The elastic plate 2, conical protrusion 7 and absorbable pad 3 cooperate to reduce both longitudinal stress shielding and shear stress shielding.

[0044] Embodiment 6: As shown in the figure, a static-dynamic fixation bone plate is used, which is matched with a cortical bone screw 10, an elastic plate 2 and a conical protrusion 7. The cortical bone screw passes through the pressure-free side screw locking half hole 4 in the screw hole 14 and is locked with the elastic plate 2 at the fracture site. The spherical depression 8 and the arched convex surface 9 on the elastic plate 2 on the proximal bone surface side between the screw holes 14 make the elastic plate 2 as a whole form a shoulder pole shape when the fracture is fixed, so that the elastic plate 2 has elasticity and forms a low stress shielding. At the same time, the conical protrusion 7 on the proximal bone surface side of the elastic plate 2 drills into the bone, and the conical protrusion 7 raises the elastic plate 2 so that the elastic plate 2 is suspended on the bone surface. At this time, the elastic plate 2 is like an external fixation bracket on the bone surface, which can produce better elasticity. As the conical protrusion 7 continues to compress and absorb the bone, the strong fixation of the fracture is gradually weakened, reducing the stress shielding effect of the bone plate on the bone. This embodiment is applied to fractures of lower limbs or upper limbs, because the elastic plate 2 has the function of reducing longitudinal and shear stress shielding. The bones of the lower limbs are weight-bearing bones and mainly bear longitudinal stress, while the bones of the upper limbs are non-weight-bearing bones and are subject to shear stress most of the time. Therefore, it can reduce longitudinal stress shielding and shear stress shielding.

[0045] Embodiment 7: As shown in the figure, a static-dynamic fixation bone plate is used in combination with a high-thread screw 1 and a fixation plate currently commonly used in clinical practice. The high-thread screw 1 passes through the pressure-free side screw locking half hole 4 in the screw hole 14 and is locked with the fixation plate. This embodiment is applied to lower limb fractures because the high-thread screw 1 has the effect of reducing longitudinal stress. The lower limb bones are weight-bearing bones and mainly bear longitudinal stress, so the longitudinal stress shielding can be reduced.

[0046] Embodiment 8: As shown in the figure, a static-dynamic fixation bone plate adopts a high-thread screw 1, a fixing steel plate 15 currently commonly used in clinical practice, and an absorbable pad 3. The absorbable pad 3 is embedded in the pressure-side half hole 5 in the screw hole 14, and is squeezed with the locking thread on the nut 10 of the high-thread screw 1, participating in the locking of the high-thread screw 1 and the fixing steel plate 15. The high-thread screw 1 passes through the pressure-free side screw locking half hole 4 in the screw hole 14, and is locked with the fixing steel plate 15 at the fracture site. This embodiment is applied to the lower limbs, because the high-thread screw 1 and the absorbable pad 3 cooperate to reduce the longitudinal stress shielding effect. The bones of the lower limbs are weight-bearing bones and mainly bear longitudinal stress, so the longitudinal stress shielding can be reduced.

[0047] Embodiment 9: As shown in the figure, a static-dynamic fixation plate is used, which is matched with a high-thread screw 1, a fixation plate currently commonly used in clinical practice, an absorbable pad 3 and a conical protrusion 7. The screw hole 14 has a pressure side half hole 5 in which the absorbable pad 3 is embedded, which is squeezed with the locking thread on the nut 10 of the high-thread screw 1 to participate in the locking of the high-thread screw 1 and the fixation plate. The high-thread screw 1 passes through the pressure-free side screw locking half hole 4 in the screw hole 14 and is locked with the fixation plate at the fracture site. At the same time, the conical protrusion 7 drills into the bone. The conical protrusion 7 raises the fixation plate so that the fixation plate is suspended on the bone surface. At this time, the fixation plate is like an external fixation bracket on the bone surface, which can produce better elasticity. As the conical protrusion 7 continues to compress and absorb the bone, the strong fixation of the fracture is gradually weakened, reducing the stress shielding effect of the bone plate on the bone. This embodiment is applied to the lower limbs, because the high-thread screw 1, the absorbable pad 3 and the conical protrusion 7 cooperate to reduce the longitudinal stress shielding effect. The lower limb bones are weight-bearing bones and mainly bear longitudinal stress, so the longitudinal stress shielding can be reduced.

[0048] Embodiment 10: As shown in the figure, a static-dynamic fixation plate is used, which is matched with a high-thread screw 1, a fixation plate currently commonly used in clinical practice, and a conical protrusion 7. The high-thread screw 1 passes through the pressure-free side screw locking half hole 4 in the screw hole 14 and is locked with the fixation plate. At the same time, the conical protrusion 7 drills into the bone. The conical protrusion 7 raises the fixation plate so that the fixation plate is suspended on the bone surface. At this time, the fixation plate is like an external fixation bracket on the bone surface, which can produce better elasticity. As the conical protrusion 7 continues to compress and absorb the bone, the strong fixation of the fracture gradually weakens, reducing the stress shielding effect of the bone plate on the bone. This embodiment is applied to weight-bearing bone fractures of the lower limbs, which mainly bear longitudinal stress. Because the high-thread screw 1 and the conical protrusion 7 cooperate, they have the effect of reducing longitudinal stress shielding.

[0049] Embodiment 11: As shown in the figure, a static-dynamic fixation bone plate is used, which is matched with a high-thread screw 1, an elastic plate 2 and a conical protrusion 7. The high-thread screw 1 passes through the pressure-free side screw locking half hole 4 in the screw hole 14 and is locked with the elastic plate 2 at the fracture site. The spherical groove 8, the arched convex surface 9 and the shoulder-shaped elastic plate 2 make the elastic plate 2 elastic when the fracture is fixed to form a low stress shielding. The conical protrusion 7 raises the elastic plate 2 so that the elastic plate 2 is suspended on the bone surface. At this time, the elastic plate 2 is like an external fixation bracket on the bone surface, which can produce better elasticity. As the conical protrusion 7 continues to compress and absorb the bone, the strong fixation of the fracture is gradually weakened, reducing the stress shielding effect of the bone plate on the bone. This embodiment is applied to bone fractures of lower limbs or upper limbs, because the high-thread screw 1, elastic plate 2 and conical protrusion 7 cooperate to reduce longitudinal and shear stress shielding. The bones of the lower limbs are weight-bearing bones and mainly bear longitudinal stress, while the bones of the upper limbs are non-weight-bearing bones and are subject to shear stress most of the time. Therefore, both longitudinal stress shielding and shear stress shielding can be reduced.

[0050] Embodiment 12: As shown in the figure, a static-dynamic fixation bone plate is used, which is matched with a high-thread screw 1, an elastic plate 2, a conical protrusion 7 and an absorbable pad 3. The screw hole 14 has a pressure side half hole 4 embedded with an absorbable pad 3, which is squeezed with the locking thread on the nut 10 of the high-thread screw 1 to participate in the locking of the high-thread screw 1 and the elastic plate 2. The high-thread screw 1 passes through the non-pressure side screw locking half hole 4 in the screw hole 14 and is locked with the elastic plate 2 at the fracture site. The spherical concave surface 8 and the arched convex surface 9 and the pole-shaped elastic plate 2, when the fracture is fixed, the elastic plate 2 is elastic to form a low stress shielding, the high-thread screw 1 is surrounded by a boss 6, and the boss 6 is provided with four conical protrusions 7, the conical protrusions 7 raise the elastic plate 2, so that the elastic plate 2 is suspended on the bone surface, at this time, the elastic plate 2 is like an external fixation bracket on the bone surface, which can produce better elasticity, and as the conical protrusions 7 continue to compress and absorb the bones, the strong fixation of the fracture is gradually weakened, reducing the stress shielding effect of the bone plate on the bones. This embodiment is applied to lower limb or upper limb bone fractures, because the high-thread screw 1, the elastic plate 2, the conical protrusion 7 and the absorbable pad 3 cooperate to reduce the longitudinal and shear stress shielding effect, the lower limb bones are negative value bones, mainly bearing longitudinal stress, and the upper limb bones are non-weight-bearing bones, which are subject to shear stress most of the time, so it can reduce longitudinal stress shielding and shear stress shielding, and this combination is the core best combination of this application.

[0051] Embodiment 13: As shown in the figure, a static-dynamic fixation bone plate is used, which is matched with a cortical bone screw, a fixation steel plate currently commonly used in clinical practice, and an absorbable pad 3. The pressure-side half hole 4 in the screw hole 14 is inlaid with the absorbable pad 3, which is squeezed with the locking thread on the nut 10 of the cortical bone screw to participate in the locking of the cortical bone screw and the fixation steel plate. The cortical bone screw passes through the non-pressure-side screw locking half hole 4 in the screw hole 14 and is locked with the fixation steel plate 15 at the fracture site. This embodiment is applied to lower limb fractures, because the absorbable pad 3 has the function of reducing longitudinal stress shielding. The lower limb bones are weight-bearing bones and mainly bear longitudinal stress, so the longitudinal stress shielding can be reduced.

[0052] Embodiment 14: As shown in the figure, a static-dynamic fixation plate is used, which is matched with cortical bone screws, the fixation steel plate currently commonly used in clinical practice and the conical protrusion 7. The cortical bone screw passes through the pressure-free side screw locking half hole 4 in the screw hole 14 and is locked with the fixation steel plate at the fracture site. The conical protrusion 7 raises the fixation steel plate so that the fixation steel plate 5 is suspended on the bone surface. At this time, it is like an external fixation bracket on the bone surface, which produces better elasticity. As the conical protrusion 7 continues to compress and absorb the bone, the strong fracture fixation is weakened, and the stress shielding effect of the bone plate on the bone is reduced. This embodiment is applied to upper limb fractures, because the conical protrusion 7 has the effect of reducing shear stress shielding, and the lower limb bones are weight-bearing bones, which mainly bear longitudinal stress, so the longitudinal stress shielding can be reduced.

[0053] Embodiment 15: As shown in the figure, a static-dynamic fixation plate is used, which is matched with a cortical bone screw, a fixation plate currently commonly used in clinical practice, an absorbable pad 3 and a conical protrusion 7. The pressure-side half hole 5 in the screw hole 14 is inlaid with the absorbable pad 3, which is squeezed with the locking thread on the nut 10 of the cortical bone screw to participate in the locking of the cortical bone screw and the fixation plate 15. The cortical bone screw passes through the pressure-free side screw locking half hole 4 in the screw hole 14 and is locked with the fixation plate at the fracture site. The conical protrusion 7 raises the fixation plate so that the fixation plate is suspended on the bone surface. At this time, it is like an external fixation bracket on the bone surface, which produces better elasticity. As the conical protrusion 7 continues to compress and absorb the bone, the strong fracture fixation is weakened, reducing the stress shielding effect of the bone plate on the bone. This embodiment is applied to lower limb or upper limb bone fractures, because the absorbable pad 3 and the conical protrusion 7 cooperate to reduce the longitudinal and shear stress shielding effect. The lower limb bones are negative bones and mainly bear longitudinal stress, while the upper limb bones are non-weight-bearing bones and are subject to shear stress most of the time. Therefore, it can reduce the longitudinal stress shielding and the shear stress shielding.

Claims

1. A static-dynamic fixation bone plate, comprising a fixation steel plate, characterized in that: It also includes a high-thread screw, which consists of a double-thread section close to the tip, a single-thread section away from the tip and a nut at the top, the taper formed by the thread bottom diameter of the single-thread section and the axial centerline of the screw decreases from top to bottom, the thread bottom diameter of the double-thread section and the taper of the axial centerline of the screw are the same from top to bottom, the diameter of the high-thread screw is 1.0-6.0mm, the thread distance of the single-thread section is twice the thread distance of the double-thread section, the thread distance of the double-thread section is 1-4mm, the thread bottom width is 0.3-3mm, the outer periphery of the nut is provided with a locking thread, the thread cross-section of the high-thread screw is a triangular cross-section, the fixing steel plate is provided with a plurality of screw holes that pass through the fixing steel plate, the screw holes are arranged along the axial direction of the fixing steel plate with the midpoint as a mirror image, each screw hole is composed of a pressure side half hole and a pressure-free side screw locking half hole that are oppositely arranged along the axial direction of the fixing steel plate, the pressure-free side screw locking half hole is provided with a locking thread, and the high-thread screw passes through the pressure-free side screw locking half hole and is locked with the fixing steel plate.

2. The static-dynamic fixation bone plate according to claim 1, characterized in that: It also includes an absorbable pad, which is embedded in the pressure-side half hole and squeezed with the locking thread on the high-thread screw nut to participate in the locking of the high-thread screw and the fixed steel plate.

3. The static-dynamic fixation bone plate according to claim 1 or 2, characterized in that: A plurality of cone-shaped protrusions are arranged around the screw holes on the bone surface side of the fixing steel plate.

4. The static-dynamic fixation bone plate according to claim 1, characterized in that: The fixed steel plate is replaced by an elastic plate, which is 1 / 5-1 / 3 tubular, and the elastic plate consists of a middle part and outer parts connected to the middle part on both sides respectively, and the outer parts on both sides gradually narrow and become thinner from the junction of the middle part and the outer parts to the two sides laterally, and the elastic plate is provided with a plurality of screw holes that penetrate the elastic plate, and the screw holes are arranged with the midpoint as a mirror image along the axial direction of the elastic plate, and each screw hole consists of a pressure side half hole and a pressure-free side screw locking half hole that are relatively arranged along the axial direction of the elastic plate, and a locking thread is arranged in the pressure-free side screw locking half hole, and a boss is arranged around the screw hole on the proximal bone surface side of the elastic plate, and spherical depressions facing the distal bone surface side are relatively arranged on both sides of the proximal bone surface side of the elastic plate, and an arched surface is longitudinally provided on the proximal bone surface side of the elastic plate, and the spherical depression and the arched surface are located between each screw hole, and the high-thread screw passes through the pressure-free side screw locking half hole and is locked with the elastic plate.

5. The static-dynamic fixation bone plate according to claim 4, characterized in that: The boss is provided with a plurality of conical protrusions.

6. The static-dynamic fixation bone plate according to claim 4 or 5, characterized in that: It also includes an absorbable pad, which is embedded in the pressure-side half hole and squeezed with the locking thread of the high-thread screw nut to participate in the locking of the high-thread screw and the elastic plate.

7. The static-dynamic fixation bone plate according to claim 4, characterized in that: The high-thread screw is replaced by a cortical bone screw, which passes through the screw locking half hole on the non-pressure side and is locked with the elastic plate.

8. The static-dynamic fixation bone plate according to claim 7, characterized in that: The boss is provided with a plurality of conical protrusions.

9. The static-dynamic fixation bone plate according to claim 7 or 8, characterized in that: It also includes an absorbable pad, which is embedded in the pressure-side half hole of the screw hole on the distal bone side of the elastic plate. The cortical bone screw passes through the non-pressure-side screw locking half hole and is locked with the elastic plate. The absorbable pad is squeezed with the locking thread of the cortical bone screw nut to participate in the locking of the cortical bone screw and the elastic plate.

10. The static-dynamic fixation bone plate according to claim 2, characterized in that: The high-thread screw is replaced by a cortical bone screw, and an absorbable pad is embedded in the pressure-side half hole on the fixing plate. The cortical bone screw passes through the non-pressure-side screw locking half hole and is locked with the fixing plate. The absorbable pad is squeezed with the locking thread on the cortical bone screw nut to participate in the locking of the cortical bone screw and the fixing plate.

11. The static-dynamic fixation bone plate according to claim 1, characterized in that: The high-thread screw is replaced by a cortical bone screw, and a plurality of conical protrusions are arranged around the screw hole on the near-bone surface side of the fixing plate. The cortical bone screw passes through the screw locking half hole on the pressure-free side and is locked with the fixing plate.

12. The static-dynamic fixation bone plate according to claim 11, characterized in that: It also includes an absorbable pad, which is embedded in the pressure-side half hole on the fixed steel plate. The absorbable pad is squeezed with the locking thread on the cortical bone screw nut to participate in the locking of the cortical bone screw and the fixed steel plate.

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