CN109124747B - Fracture external fixation support with variable rigidity - Google Patents
Fracture external fixation support with variable rigidity Download PDFInfo
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- CN109124747B CN109124747B CN201811299737.2A CN201811299737A CN109124747B CN 109124747 B CN109124747 B CN 109124747B CN 201811299737 A CN201811299737 A CN 201811299737A CN 109124747 B CN109124747 B CN 109124747B
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- rod
- spring
- cross beam
- fracture
- supporting rod
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/60—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like for external osteosynthesis, e.g. distractors, contractors
- A61B17/64—Devices extending alongside the bones to be positioned
- A61B17/6441—Bilateral fixators, i.e. with both ends of pins or wires clamped
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/60—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like for external osteosynthesis, e.g. distractors, contractors
- A61B17/64—Devices extending alongside the bones to be positioned
- A61B17/645—Devices extending alongside the bones to be positioned comprising a framework
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- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Surgery (AREA)
- Biomedical Technology (AREA)
- Engineering & Computer Science (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Surgical Instruments (AREA)
Abstract
The application discloses a fracture external fixation support with variable rigidity, which comprises a rigidity adjusting rod, a cross beam and a steel needle; the rigidity adjusting rod comprises a left supporting rod and a right supporting rod, a nut which can rotate along the right supporting rod is matched with the outer part of the right supporting rod, a flexible rod is connected between the left supporting rod and the right supporting rod, a spring is sleeved outside the flexible rod, one end of the spring is contacted with the right end of the left supporting rod, and the other end of the spring is contacted with the left end of the nut; the left support rod is fixedly connected with the left cross beam, the right support rod is fixedly connected with the right cross beam, and the left cross beam and the right cross beam are respectively connected with steel needles protruding out of the lower ends of the left cross beam and the right cross beam. The support can realize quantitative adjustment from low rigidity to high rigidity, and quantitative and directional adjustment during fracture II healing, so that the callus growth speed is higher and the fracture healing quality is higher.
Description
Technical Field
The application relates to the field of medical appliances, in particular to a fracture external fixation support with variable rigidity.
Background
The fracture healing forms are phase I healing and phase II healing. The healing of stage II has a great amount of poroma formation, and is an ideal healing form of fracture and a clinical and targeted treatment result. For a long time, a large number of research results prove that stress is one of the most important factors for regulating fracture healing in stage II. Because the existing research method selects a single stress form, and does not meet the condition that the fracture end of a clinical patient bears comprehensive stress, the method is difficult to be applied to clinically guiding the treatment of the fracture.
In the healing process of fracture, the fracture end is mostly subjected to various stresses such as lateral displacement, axial extrusion, bending, rotation and the like at the same time, and the stresses are in the dynamic change process. After the fracture is reset and fixed, limb rehabilitation stress becomes the biggest variable factor affecting the fracture end stress. Rehabilitation stress has two important roles: firstly, adjusting stress of fracture ends to influence fracture healing; and secondly, the functions of joints and limbs are recovered. These two effects directly determine the final effect of fracture treatment. Fracture rehabilitation has so far been considered by the industry as the most difficult treatment technique to master for fracture treatment due to the arbitrary subjectivity of the rehabilitation process, the complexity of fracture fixation, and the uncertainty of fixation stability.
In the prior art, in order to apply different stresses to fracture ends in different periods of fracture healing, a plurality of fixing supports with different rigidities can be only made, for example, different fixing supports are selected for fixing in different periods, and adverse effects on fracture alignment and fracture healing are generated due to short-time failure of fixing in the replacing process cannot be avoided technically. How to adopt a set of device needle to adapt to the stress requirements of fracture healing in each period through changing rigidity or to adjust the stress by changing recovery quantity, thereby not only promoting fracture healing but also recovering limb functions, and being the difficult problem to be solved in orthopedics clinical urgent need.
Disclosure of Invention
In order to solve the problems, the application provides the fracture fixing bracket with variable rigidity, which can realize the quantitative adjustment from low rigidity to high rigidity, and respectively carries out timing, quantitative and directional adjustment at three changing time points of stem cell recruitment, differentiation and osteogenesis of fracture II healing, thereby leading the growth speed of poroma to be faster and the quality of fracture healing to be higher.
In order to achieve the above object, the present application adopts the following technical solutions:
a fracture external fixation support with variable rigidity comprises a rigidity adjusting rod, a cross beam and a steel needle;
the rigidity adjusting rod comprises a left supporting rod and a right supporting rod, a nut capable of rotating along the right supporting rod is matched outside the right supporting rod, a flexible rod is connected between the left supporting rod and the right supporting rod, a spring is sleeved outside the flexible rod, one end of the spring is contacted with the right end of the left supporting rod, and the other end of the spring is contacted with the left end of the nut;
the left support rod is fixedly connected with the left cross beam, the right support rod is fixedly connected with the right cross beam, the left cross beam and the right cross beam are respectively connected with steel needles, and the steel needles protrude out of the lower ends of the left cross beam and the right cross beam.
Preferably, the right end of the left support rod is provided with a protruding portion, and the right end face of the protruding portion is provided with a first groove for positioning the left end of the spring.
Preferably, the left end face of the nut is provided with a second groove for positioning the right end of the spring.
Preferably, the spring is a cylindrical compression spring.
Preferably, the left beam or the right beam comprises a first beam plate and a second beam plate which are matched with each other, a through hole is reserved in the middle of the assembled first beam plate and the assembled second beam plate, the steel needle penetrates through the through hole, and the first beam plate and the second beam plate are detachably connected through screws.
The application has the beneficial effects that:
(1) According to the application, the nut and the left support rod can compress the spring to different degrees by operating the nut to move along the right support rod, so that the spring generates different degrees of lateral rigidity, and the overall rigidity of the fixing support is changed. After the fracture is reset and fixed, the variable adjustment of the fracture end stress from low rigidity to high rigidity can be realized by adjusting the rigidity of the fixing bracket and only using one pair of fixing brackets. The stress change of the broken end of the bone is controlled and regulated by quantifying the quantitative rehabilitation stress, so that the fracture healing can be promoted, and the joint function can be recovered. Multidirectional stress promotes peripheral intramembranous osteogenesis by recruiting a greater number of stem cells, regulating chondrocyte differentiation, and the synergistic promotion of cartilage osteogenesis and intramembranous osteogenesis, thereby resulting in faster callus growth rate and higher fracture healing quality.
(2) The arrangement of the first groove and the second groove can accurately fix the spring, so that the spring can not generate redundant lateral force due to play when being compressed.
(3) The left beam or the right beam is assembled by adopting the first beam plate and the second beam plate which are connected with each other through screws, so that the replacement of the steel needle and the disassembly and assembly of the whole device are convenient, the modularization degree of the device is high, and the interchangeability is good.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a perspective view of the overall structure of the present application;
FIG. 2 is a front view of the overall structure of the present application;
FIG. 3 is a top view of the overall structure of the present application;
FIG. 4 is an enlarged view of A in FIG. 3;
FIG. 5 is an enlarged view of B in FIG. 3;
in the figure: 1. left connecting block, 2, left branch, 3, spring, 4, right branch, 5, right connecting block, 6, connecting screw, 7, right crossbeam, 8, steel needle, 9, bone pipe, 10, screw, 11, protruding portion, 12, first recess, 13, second recess, 14, nut, 15, left crossbeam.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.
In the description of the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
Aiming at the problems in the background art, a cytological three-phase stage method of the fracture healing process is found in clinical and experimental researches, and obvious differences of appropriate stress in three phases are clarified, so that a method for adjusting the rigidity of the fixator is provided, and different stress environments suitable for the three phases of fracture are established, so that fracture healing is promoted. According to the previous research results, the external bone fixing bracket with variable rigidity and promotion of fracture healing is designed and manufactured. Animal experiments prove that the bone external fixation support with variable rigidity for promoting fracture healing treats fracture, and can effectively promote fracture secondary healing. The following describes a further example of a fixation stent for promoting fracture healing, taking a femoral fracture in a rat as an example.
As shown in the external fixation support of figures 1-5, two sides of the fracture end face of the bone tube 9 are respectively fixed by steel needles 8, preferably four steel needles, the steel needles are made of Italian Orphfix products, and the diameter is preferably 1.5mm. Two steel needles on the left side of the fracture end face penetrate through the through holes of the left cross beam 15, and the first cross beam plate and the second cross beam plate which form the left cross beam 15 are fastened through screws 10. Two steel needles on the right side of the fracture end face penetrate through the through holes of the right cross beam 7. The left cross member 15 or the right cross member 7 is detachably connected by a screw 10 to both the first cross member plate and the second cross member plate. The length, width and height of the first and second beam plates are respectively 10mm, 5.5mm and 6mm, and the screw 10 is preferably a titanium alloy micro screw with the diameter of 2.6mm of the Qiangsheng company.
The left cross beam 15 is fixed with the left connecting block 1 through the connecting screw 6, the right cross beam 7 is fixed with the right connecting block 5 through the connecting screw 6, the left supporting rod 2 is installed to the other end of the left connecting block 1, and the right end of the left supporting rod 2 is provided with the protruding portion 11. The other end of the right connecting block 5 is provided with a right supporting rod 4, the outer part of the right supporting rod 4 is provided with threads, and the diameter of the threads is preferably 3.5mm. Is threadedly engaged with the nut 14. A flexible rod is connected between the left support rod 2 and the right support rod 4 for increasing the flexibility of the bone fracture ends at two sides of the fracture end face in the initial stage of fracture healing, and the diameter of the flexible rod is preferably 0.5 mm. The spring 3 is sleeved outside the flexible rod, the spring is preferably a cylindrical compression spring, and the diameter of the spring wire is preferably 4.5mm. The left end of the spring 3 is placed in the first recess 12 of the projection 11 and the right end of the spring 3 is placed in the second recess 13 of the nut 14.
According to the stress difference of stem cell recruitment, differentiation and osteogenesis, in the early stage of rat fracture healing (stem cell recruitment period), the nut 14 is adjusted to the right end of the right supporting rod 4, the spring 3 is in a free length state, the overall rigidity of the fixing support is about 12.6N/mm at the moment, and due to the effect of the flexible rod, the degrees of freedom on two sides of the bone fracture surface are larger, and under the effect of rehabilitation stress, the fracture end bears the effect of multi-directional comprehensive stress, so that the stem cell recruitment is facilitated. After one week, stem cells begin to differentiate (differentiation period), the nut 14 is rotated leftwards along the right support rod 4, the spring 3 is compressed under force, the rigidity is increased, the degrees of freedom on two sides of the bone fracture surface are reduced, and the integral rigidity of the fixing support is about 30N/mm-35N/mm, so that the differentiation of the stem cells into chondrocytes and osteoblasts is facilitated. After 2 weeks, in the later healing period (osteogenesis period), the nut 14 is rotated leftwards along the right support rod 4 to completely compress the spring, the rigidity of the fixing support reaches up to 56.3N/mm, the degrees of freedom of two sides of the bone section are reduced to the minimum, the stability of the broken end of the bone is increased, and the healing of the fracture is facilitated.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. The fracture external fixation support with variable rigidity is characterized by comprising a rigidity adjusting rod, a cross beam and a steel needle;
the rigidity adjusting rod comprises a left supporting rod and a right supporting rod, a nut capable of rotating along the right supporting rod is matched outside the right supporting rod, a flexible rod is connected between the left supporting rod and the right supporting rod, a spring is sleeved outside the flexible rod, one end of the spring is contacted with the right end of the left supporting rod, and the other end of the spring is contacted with the left end of the nut;
the nut and the left support rod can compress the spring to different degrees by operating the nut to move along the right support rod, so that the spring generates different degrees of lateral rigidity, and the overall rigidity of the fixed support is further changed;
the left support rod is fixedly connected with the left cross beam, the right support rod is fixedly connected with the right cross beam, the left cross beam and the right cross beam are respectively connected with steel needles, and the steel needles protrude out of the lower ends of the left cross beam and the right cross beam.
2. The fracture external fixation support with variable rigidity according to claim 1, wherein the right end of the left support rod is provided with a protruding portion, and the right end surface of the protruding portion is provided with a first groove for positioning the left end of the spring.
3. A variable stiffness external fixation bracket for fracture according to claim 2, wherein the left end surface of the nut is provided with a second groove for positioning the right end of the spring.
4. A variable stiffness external fixation bracket for fracture according to claim 1, wherein the spring is a cylindrical compression spring.
5. The fracture external fixation support with variable rigidity according to claim 1, wherein the left beam or the right beam comprises a first beam plate and a second beam plate which are matched with each other, a through hole is reserved between the first beam plate and the second beam plate after the first beam plate and the second beam plate are assembled, the steel needle penetrates through the through hole, and the first beam plate and the second beam plate are detachably connected through screws.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811299737.2A CN109124747B (en) | 2018-11-02 | 2018-11-02 | Fracture external fixation support with variable rigidity |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811299737.2A CN109124747B (en) | 2018-11-02 | 2018-11-02 | Fracture external fixation support with variable rigidity |
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| CN109124747A CN109124747A (en) | 2019-01-04 |
| CN109124747B true CN109124747B (en) | 2023-08-25 |
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| CN201811299737.2A Active CN109124747B (en) | 2018-11-02 | 2018-11-02 | Fracture external fixation support with variable rigidity |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111437021A (en) * | 2020-04-30 | 2020-07-24 | 四川大学华西医院 | Intelligent orthopedic external support system |
| CN112067271A (en) * | 2020-09-14 | 2020-12-11 | 东风汽车底盘系统有限公司 | Single-leaf spring fatigue test method and device |
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