A kind of self-taped type Medullary fixation device being applicable to long bone fractureTechnical field
The present invention relates to a kind of Medullary fixation device for long bone fracture, belong to orthopedic medical device technical field.
Background technology
Long bone fracture is clinical common fracture, now many employing open reduction blade plate internal fixtion and intramedullary pin internal fixtion, blade plate internal fixtion long incision, wound is large, and traditional Therapeutic Method need cut and appear fracture area, then reduction fixation is carried out, this method is large to fracture soft tissue injury around, and intraoperative hemorrhage is many, and damage is large, and needing secondary to take out, patient's post-operative recovery time is long.Intramedullary nailing operation wound is little, increasingly extensive at orthopedics clinic practice.But the same with blade plate screw, Intramedullary nailing belongs to rigid structure, insert in process can not adapt to well local skeletal form, surrounding soft tissue and osseous tissue may be extruded.Intramedullary pin elastic modelling quantity, much larger than human normal skeleton, easily causes stress raisers.Employing Intramedullary nailing long bone fracture, the complication such as internal fixtion loosens, fracture, nonunion happen occasionally.In addition, Intramedullary nailing needs to carry out expansion marrow, may cause the complication such as fat embolism match, pulmonary infarction when expanding marrow.Therefore, urgently research and develop a kind of bionical, elastic modelling quantity closer to skeleton and also intramedullary pin can be reduced expand the intramedullary nail fixation device that marrow exists fat embolism, pulmonary infarction equivalent risk.
Summary of the invention
The invention provides a kind of self-taped type Medullary fixation device for long bone fracture, to overcome the drawback that prior art exists.
For realizing the object of the invention, this self-taped type Medullary fixation device for long bone fracture is a rhabodoid, it is characterized in that described rhabodoid is made up of the spring body be connected between a drilling rod and leader, described drilling rod and handle are tubular body structure, drill rod end is provided with drilling sword, drilling rod outer circumference surface is provided with spiral type chip area, and handle and drilling rod offer lock hole respectively.
Described spiral type chip area is right spiral or left-hand screw groove.
The length of described spring body is 3/5 ~ 7/10 of rhabodoid length.
The length of described drilling rod is 4/25 ~ 1/5 of rhabodoid length.
The technological progress that the present invention obtains:
The present invention is directed to the feature of long bone shaft fracture, existing intramedullary needle basis is improved, a spring body is added by the middle of original integral type intramedullary needle, the structure of spring body can strengthen elasticity of the present invention, it is made more to mate with the elastic modelling quantity of human body long bone, its elastic modelling quantity can increase elastic deformation of the present invention, more adapts to body mechanics's feature, and its fine motion feature can the growth of effective stimulus fracture site.Drilling rod outer circumference surface adds spiral grooves, obviate original smooth design, precession strength can be strengthened, reduce pressure when inserting of the present invention and mechanical stimulus, determine according to the direction of fracture line the present invention using right spiral or left-hand screw groove, the effect to fracture end pressurization can be played, right spiral or left-handed screw channel structural design can comply with fracture direction, offset corresponding fracture stress, and internal fixtion is strengthened in final pressurization, it combines with the drilling sword of end, can strengthen self tapping ability further.Screw thread after precession can also increase the hold to sclerotin, combine with lock screw, effectively can reduce the risk that the complication such as inside-fixture loosens, fracture occur, the present invention does not affect C-arm in art and throws according to the visual field, X-ray examination device separately or can be coordinated to carry out minimally-invasive treatment, wound can be reduced further and realize minimum x-ray to expose.The present invention is rational in infrastructure, flexibly simple to operate, and elastic modelling quantity is good, fixed, avoiding periosteum stripping and expanding marrow stimulates, and effectively can promote union of fracture, make patient can carry out functional exercise in early days, reduce post-operative complication at a specified future date, there is excellent Social benefit and economic benefit.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention.
Fig. 2 is using state reference view of the present invention.
Detailed description of the invention
As Fig. 1, shown in Fig. 2, the self-taped type Medullary fixation device that the present invention is used for long bone fracture is a rhabodoid, this rhabodoid is made up of the spring body 2 be connected between a drilling rod 1 and leader 3, this spring body 2 has high resistance to compression and tensile strength, its length does not change after surgery, and can only along long stock 5 axially in all directions fine motion, the length of spring body 2 is 3/5 ~ 7/10 of rhabodoid length, the length of drilling rod 1 is 4/25 ~ 1/5 of rhabodoid length, drilling rod 1 and handle 3 are a tubular body structure, the leading section of drilling rod 1 is provided with drilling sword, drilling rod outer circumference surface is provided with spiral type chip area, spiral type chip area is right-hand screw chip area or left-hand screw chip area, handle 3 and drilling rod 1 offer lock hole respectively, for improving fix tightly solidity of the present invention, on handle 3 and drilling rod 1, lock hole offers place, handle 3 and drilling rod 1 are solid structure.
By self tapping effect, tail cap 4 is screwed in insert the present invention in pulp cavity after, along with under human muscle's motion, human bady gravitational effect and External Force Acting, drilling rod 1 and handle 3 can produce fine motion, drilling rod 1 is made to produce hettocyrtosis inserting in process, thus reducing crush injury to surrounding soft tissue, elasticity inherently and fine motion simultaneously makes at utmost to reduce stress shielding while fracture fixation, and the fine motion of fracture end also can stimulate the quickly-healing of fracture.