Controllable micro-motion elastic inner fixing device with bidirectional locking pressing plate structure

Abstract

The utility model provides a controllable micro-motion elastic internal fixation device with a bidirectional locking pressing plate structure, and belongs to the technical field of orthopedic medical instruments. Comprising a plurality of bridging rods; and the two end blocks are arranged at the two ends of the bridging rod. A stable frame structure is constructed through the combination of the bridging rod, the end block and the fixing screw, a fracture part is effectively connected and fixed in the axial direction, then a bidirectional locking mechanism is formed through the upper pressing plate, the lower pressing plate, the adjusting lead screw and the locknut, and the fracture part is locked by screwing the locknut. The distance and pressure between the pressing plates can be accurately adjusted and locked, dynamic force generated by factors such as muscle contraction and limb movement can be effectively resisted in the long-term use process, the pressing plates are prevented from loosening or displacing, and it is ensured that the fixing device always keeps the stable fixing effect; and the problems of poor fracture healing or malformation healing and the like caused by fixation failure are avoided.

Description

Technical Field

[0001] This utility model relates to the field of orthopedic medical device technology, and in particular to a controllable micro-motion elastic internal fixation device with a bidirectional locking pressure plate structure. Background Technology

[0002] Fractures are common traumatic injuries, and traditional treatments mainly include conservative treatment and surgical treatment. Surgical treatment typically uses internal fixation devices to immobilize the fracture site and promote healing. Existing internal fixation devices mainly include plates, intramedullary nails, and external fixators.

[0003] Currently, traditional internal fixation devices typically employ relatively simple fixation methods, such as unidirectional plate and screw fixation or intramedullary nail fixation. These fixation methods can provide a certain degree of stability in one main force direction, but lack effective resistance to forces in other directions. Therefore, this application provides a controllable micro-motion elastic internal fixation device with a bidirectional locking pressure plate structure to meet the requirements. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a controllable micro-motion elastic internal fixation device with a bidirectional locking pressure plate structure to solve the problem that traditional internal fixation devices usually adopt a single fixation method and lack effective resistance to forces in other directions.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution.

[0006] A controllable micro-motion elastic internal fixation device with a bidirectional locking pressure plate structure includes: a plurality of bridging rods; two end blocks disposed at both ends of the bridging rods; two fixing screws respectively disposed on the two end blocks for fixing to the fracture site; a lower pressure plate disposed on the bridging rods; and an upper pressure plate disposed on the bridging rods and identical to the lower pressure plate. The upper pressure plate includes: a first pressure plate disposed on the bridging rods; a second pressure plate disposed on one side of the first pressure plate; two fastening screws disposed on both sides of the first pressure plate; two adjusting screws respectively passing through the first pressure plate and the second pressure plate; and an anti-loosening nut disposed on the adjusting screw.

[0007] The second pressure plate is smaller than the first pressure plate; the first pressure plate and the second pressure plate are stacked together and can slide relative to each other after being stacked.

[0008] It also includes: a friction plate, disposed between the first pressure plate and the second pressure plate, used to control the relative motion resistance between the two pressure plates by adjusting the tightness between the friction plates.

[0009] The adjusting screw has a fine thread.

[0010] The side of the second pressure plate that contacts the bone surface is made of medical rubber or soft alloy material.

[0011] The friction pad is made of a wear-resistant and biocompatible material.

[0012] The soft alloy material is a cobalt-chromium alloy or a nickel-titanium alloy.

[0013] According to any one of the above, the end block and the bridging rod are either detachably connected or integrally formed.

[0014] Compared with the prior art, this utility model has at least the following beneficial effects.

[0015] In the above solution, a stable frame structure is constructed by combining the bridging rod, end block, and fixing screw, which effectively connects and fixes the fracture site axially. The upper pressure plate, lower pressure plate, adjusting screw, and anti-loosening nut form a two-way locking mechanism. By tightening the anti-loosening nut, the distance and pressure between the pressure plates can be precisely adjusted and locked. During long-term use, it can effectively resist the dynamic forces generated by factors such as muscle contraction and limb movement, prevent the pressure plates from loosening or shifting, and ensure that the fixation device always maintains a stable fixation effect, avoiding problems such as poor fracture healing or malunion due to fixation failure.

[0016] By setting up a first pressure plate, a second pressure plate, and friction pads, precise control of the micro-motion amplitude is achieved. The tightness of the friction pads can be adjusted by adjusting the screw, thereby changing the relative motion resistance between the two pressure plates and accelerating the fracture healing process. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a controllable micro-motion elastic internal fixation device with a bidirectional locking pressure plate structure.

[0018] Figure 2 This is a rear view of the bridging rod structure.

[0019] Figure 3 This is a side view of the second pressure plate structure.

[0020] [Figure Labels]

[0021] 1. Bridging rod; 2. Fixing screw; 3. End block; 4. Upper pressure plate; 5. Fastening screw; 6. Lower pressure plate; 41. First pressure plate; 42. Adjusting screw; 43. Second pressure plate; 44. Friction plate; 45. Anti-loosening nut.

[0022] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of this utility model. However, this is only for illustrative purposes and is not intended to limit this utility model to the specific structure, device and environment. According to specific needs, those skilled in the art can adjust or modify these devices and environments, and such adjustments or modifications are still included in the scope of the appended claims. Detailed Implementation

[0023] The controllable micro-motion elastic internal fixation device with a bidirectional locking pressure plate structure provided by this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. It should also be noted that, in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art can also use other alternative methods to implement some known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit this utility model.

[0024] like Figure 1 - Figure 3 As shown, an embodiment of this utility model provides a controllable micro-motion elastic internal fixation device with a bidirectional locking pressure plate structure, comprising: a plurality of bridging rods 1; two end blocks 3 disposed at both ends of the bridging rods 1; two fixing screws 2 respectively disposed on the two end blocks 3 for fixing to the fracture site; a lower pressure plate 6 disposed on the bridging rods 1; and an upper pressure plate 4 disposed on the bridging rods 1 and identical to the lower pressure plate 6. The upper pressure plate 4 comprises: a first pressure plate 41 disposed on the bridging rods 1; a second pressure plate 43 disposed on one side of the first pressure plate 41; two fastening screws 5 disposed on both sides of the first pressure plate 41; two adjusting screws 42 respectively passing through the first pressure plate 41 and the second pressure plate 43; and an anti-loosening nut 45 disposed on the adjusting screws 42.

[0025] The two ends of the first adjusting screw 42 pass through the first pressure plate 41, and the two ends of the second adjusting screw 42 pass through the second pressure plate 43; the doctor can also pre-adjust the device outside the body before the operation to ensure that the position and pressure of each component meet the expectations.

[0026] The second pressure plate 43 is smaller than the first pressure plate 41. The first pressure plate 41 and the second pressure plate 43 overlap and can slide relative to each other after overlapping. By setting the second pressure plate 43, the smaller second pressure plate 43 can better adapt to the irregular shape of the local bone when in contact with the bone surface. When the anti-loosening nut 45 on the second pressure plate 43 is turned, the second pressure plate 43 is pushed to move relative to the first pressure plate 41. The direction of displacement depends on the thread direction of the adjusting screw 42 and the direction of turning the anti-loosening nut 45. This can change the pressure distribution and magnitude of the upper pressure plate 4 on the fracture site. When the second pressure plate 43 moves closer to the fracture site, the pressure of the upper pressure plate 4 on the fracture site will increase, and the pressure distribution will change accordingly; conversely, when the second pressure plate 43 moves away from the fracture site, the pressure will decrease.

[0027] During the installation or adjustment of the device, by properly tightening the anti-loosening nut 45 on the first pressure plate 41 in conjunction with the anti-loosening nut 45 on the second pressure plate 43 and the adjusting screw 42, the initial relative position relationship between the first pressure plate 41 and the second pressure plate 43 can be adjusted more conveniently, ensuring that the entire upper pressure plate 4 structure is in a suitable pre-tightened state before bearing a load.

[0028] It also includes: friction plates 44, disposed between the first pressure plate 41 and the second pressure plate 43, used to control the relative motion resistance between the two pressure plates by adjusting the tightness between the friction plates 44. When the second pressure plate 43 is displaced relative to the first pressure plate 41 by turning the anti-loosening nut 45 on the second pressure plate 43, the tightness between the friction plates 44 will change accordingly. When the second pressure plate 43 moves closer to the first pressure plate 41, the pressure between the friction plates 44 increases, the tightness increases, thereby increasing the relative motion resistance between the two pressure plates; conversely, when the second pressure plate 43 moves away from the first pressure plate 41, the pressure between the friction plates 44 decreases, the tightness decreases, and the relative motion resistance also decreases.

[0029] The side of the second pressure plate 43 that contacts the bone surface is made of medical-grade rubber or soft alloy material. By using medical-grade rubber, which has good elasticity and flexibility, it can effectively buffer and absorb forces during the initial stages of fracture fixation when the patient's limb moves or experiences minor external impacts. This prevents the impact force from being directly transmitted to the fracture site, reduces the impact on the fracture ends, and prevents fracture displacement. The rubber surface typically has a certain degree of roughness or texture, which allows the second pressure plate 43 to provide better friction when in contact with the bone surface. During fracture fixation, this friction helps prevent the pressure plate from sliding or shifting on the bone surface, maintaining stable fixation of the device at the fracture site even when the patient's limb moves or is subjected to external forces.

[0030] The adjusting screw 42 has a fine thread. Compared with a coarse thread, the fine thread has a smaller pitch. When the adjusting screw 42 or the lock nut 45 is turned, the displacement of the second pressure plate 43 relative to the first pressure plate 41 is smaller with each rotation. This allows the operator to make more precise adjustments to the distance and pressure between the pressure plates.

[0031] The friction pad 44 is made of a wear-resistant and biocompatible material. During use, the relative motion resistance between the two pressure plates needs to be controlled by adjusting the tightness between the friction pads 44. The friction pads 44 are frequently subjected to relative sliding and pressure. The wear-resistant material ensures that the surface of the friction pads 44 is not easily worn during long-term use, thus maintaining a relatively stable coefficient of friction. The biocompatible material avoids adverse tissue reactions and also has certain biological activity, promoting the attachment and growth of bone cells on its surface. Special treatments can also be applied to the surface of the friction pads 44, such as coating technology, to coat the surface with a thin film with lubricating and wear-resistant properties, such as diamond-like carbon (DLC) coating. DLC coating has an extremely low coefficient of friction, high hardness, and good chemical stability, which not only reduces wear between the friction pads 44 but also reduces the impact of tissue fluid on friction performance.

[0032] The soft alloy material is either a cobalt-chromium alloy or a nickel-titanium alloy. Using a cobalt-chromium alloy provides high strength and hardness, enabling the second pressure plate 43 to provide strong support when fixing the fracture site. Simultaneously, the cobalt-chromium alloy exhibits good tissue compatibility in the human body, coexisting harmoniously with surrounding tissues such as bones, muscles, and blood vessels without causing significant immune rejection or inflammatory reactions. It also possesses excellent corrosion resistance, resisting the erosion of body fluids. Using a nickel-titanium alloy provides shape memory effect, allowing it to be molded into a specific shape suitable for the fracture site at low temperatures. After implantation, it returns to its preset shape as body temperature rises, thus better conforming to the bone surface. Even after being subjected to a certain degree of deformation, such as deformation under dynamic forces during patient rehabilitation, the nickel-titanium alloy can automatically return to its original shape due to its superelasticity.

[0033] According to any of the above, the end block 3 and the bridging rod 1 are either detachably connected or integrally molded. For patients with certain special body types or abnormal bone structures, it is necessary to replace the end block 3 with different specifications to adapt to their bones. The detachable connection method allows doctors to select the appropriate end block 3 based on the patient's imaging data before surgery, or to replace it during surgery according to the actual situation. For some simple fracture types, such as transverse fractures of the bone shaft, the anatomical structure of the fracture site is relatively clear and fixed, and the need for adjustment of the fixation device is small. The integrally molded end block 3 and bridging rod 1 structure can provide sufficient stability and fixation effect.

[0034] The technical solution provided by this utility model involves placing two end blocks 3 at both ends of the fracture site, so that the bridging rod 1 fits against both ends of the fracture site. The end blocks 3 are initially fixed to the bone at the fracture site by the fixing screws 2 on the end blocks 3. It is not necessary to fully tighten the fixing screws 2. The relative positions of the first pressure plate 41 and the second pressure plate 43 are adjusted by tightening the fastening screws 5. According to the specific situation of the fracture site and the pre-set micro-movement range, the tightness between the friction plates 44 is changed by tightening the anti-loosening nut 45. Finally, all components are tightened.

[0035] This utility model encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this utility model. To provide the public with a thorough understanding of this utility model, specific details have been described in detail in the above preferred embodiments; however, those skilled in the art can fully understand this utility model even without these detailed descriptions. Furthermore, to avoid unnecessary confusion regarding the essence of this utility model, well-known methods, processes, procedures, components, and circuits have not been described in detail.

[0036] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A controllable micro-motion elastic internal fixation device with a bidirectional locking pressure plate structure, characterized in that, The utility model relates to a kind of bone fracture fixation device, including: Several bridge rods (1); Two end blocks (3) are arranged at both ends of the bridge rod (1); Two fixing screws (2) are arranged on two end blocks (3) respectively, for fixing with fracture site; Lower pressing plate (6) is arranged on the bridge rod (1); Upper pressing plate (4) is arranged on the bridge rod (1), and is same with the lower pressing plate (6); The upper pressing plate (4) includes: First pressing plate (41) is arranged on the bridge rod (1); Second pressing plate (43) is arranged on one side of the first pressing plate (41); Two fastening screws (5) are arranged on both sides of the first pressing plate (41); Two adjusting screw rods (42) are respectively arranged on the first pressing plate (41) and the second pressing plate (43); Lock nut (45) is arranged on the adjusting screw rod (42).

2. The controllable micro-motion elastic internal fixation device with bidirectional locking pressure plate structure according to claim 1, characterized in that, The size of the second pressing plate (43) is less than the first pressing plate (41);The first pressing plate (41) and the second pressing plate (43) are superimposed, and can slide relatively after superimposition.

3. The controllable micro-motion elastic internal fixation device with bidirectional locking pressure plate structure according to claim 1, characterized in that, Also includes: Friction plate (44) is arranged between the first pressing plate (41) and the second pressing plate (43), for controlling the relative motion resistance between two pressing plates by adjusting the tightness between friction plate (44).

4. The controllable micro-motion elastic internal fixation device with bidirectional locking pressure plate structure according to claim 1, characterized in that, The surface of the second pressing plate (43) contacting with bone surface is made of medical rubber or soft alloy material.

5. The controllable micro-motion elastic internal fixation device with bidirectional locking pressure plate structure according to claim 1, characterized in that, The thread of the adjusting screw rod (42) adopts fine thread.

6. The controllable micro-motion elastic internal fixation device with bidirectional locking pressure plate structure according to claim 3, characterized in that, The material of the friction plate (44) is wear-resistant and biocompatible material.

7. The controllable micro-motion elastic internal fixation device with bidirectional locking pressure plate structure according to claim 4, characterized in that, Soft alloy material is cobalt-chromium alloy or nickel-titanium alloy.

8. The controllable micro-motion elastic internal fixation device with the bidirectional locking pressure plate structure according to any one of claims 1-7, characterized in that, The end block (3) and the bridge rod (1) are detachably connected or integrally formed structure.

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