A kind of multifunctional double-headed forcing screwTechnical field
The utility model relates to the field of medical instrument technology, more specifically, it relates to a kind of multifunctional double-headed pressurization spiral shellNail.
Background technique
Fracture is that the continuity of bone structure is broken completely or partially, is more common in children and the elderly, young people also whenThere is generation.Patient is often-a position fracture, minority is multiple fracture.Through appropriate processing in time, most patients can restore formerThe function of coming, a few patients can leave different degrees of sequelae.
The fixation of existing fracture mainly passes through the instruments such as thick steel needle, plain screw, hollow screw and consolidates to fracture siteIt is fixed.Existing hollow screw includes screw body and the front end body of screw connecting with screw body, in use hollow screw to boneDuring folding part position is fixed, need to be attached by hollow screw again after squeezing the fracture site of two sides closely,Easily there is two sides fracture site and heals untight situation and hollow screw in fixation procedure the case where loose or dislocation.
Therefore, how to design a kind of multifunctional double-headed forcing screw is our problems in the urgent need to address at present.
Utility model content
The purpose of the utility model is to provide a kind of multifunctional double-headed forcing screws, have and closely draw two sides fracture endHold together, keep fracture site healing in two sides close, reduces the effect that hollow screw occurs the case where loose or dislocation in fixation procedure.
The above-mentioned technical purpose of the utility model has the technical scheme that one kind is multifunctional double-headed and addsScrew, including screw body, the screw body both ends is pressed to be respectively equipped with the front end body of screw and tail end connector；The screw sheetBody is equipped with guide pin through-hole along own axes direction, and guide pin through-hole both ends stretch out the front end body of screw and tail end connector respectivelyEnd face；Tail end connector surface is equipped with thread segment, and the hand of spiral of thread segment is identical as the hand of spiral of the front end body of screw,The screw pitch of thread segment is less than the screw pitch of the front end body of screw；The tail end connector is equipped with far from the end of the front end body of screw for electric drillThe connecting hole of connection, the tail end connector are equipped with the jack being connected to connecting hole, screw body and jack grafting；The spiral shellEnd in nail ontology insertion jack is equipped with the limit plate contradicted with connecting hole inner wall.
By using above-mentioned technical proposal, the screw pitch of the front end body of screw is less than using the screw pitch of thread segment, in front end screwWhen body and fracture site side are threadedly engaged, the thread segment on tail end connector is threadedly engaged with the fracture site other side, front endThe speed of shooting of the body of screw shoots speed greater than the thread segment on tail end connector, convenient for closely drawing fracture site two sidesHold together, keep fracture site healing in two sides close, reduces hollow screw and occur the case where loose or dislocation in fixation procedure；Utilize screwOntology and jack grafting, during dismantling double end forcing screw, the back-out speed of the front end body of screw is greater than tail end connectorOn the back-out speed of thread segment avoid double end forcing screw in disassembly by bone so that screw body is moved along jack directionThe case where folding part position generates crack backwards to extruding generation；It is contradicted using limit plate and connecting hole inner wall, convenient for limitation screw sheetBody and tail end connector relative circumferential rotate；It is contradicted using limit plate with hole end surface is connect, convenient for limitation screw body and tail endConnector is mutually disengaged inserting state.
The utility model is further arranged to: the screw pitch ratio of the screw pitch of the thread segment and the front end body of screw is 0.5-0.8。
By using above-mentioned technical proposal, so that double end forcing screw slowly draws fracture site two sides over to one's side.
The utility model is further arranged to: the tail end connector is round estrade, and the diameter of round estrade is connected along tail endThe direction of body towards the front end body of screw is gradually reduced；The diameter of the thread segment increases direction along the diameter of round estrade and gradually passsIncrease.
It by using above-mentioned technical proposal, is threadedly engaged tail end connector with fracture site easy to operate, is convenient for tailEnd connector buries in people's bone head, reduces tail end connector to the excitation of surrounding tissue.
The utility model is further arranged to: the tilt angle of the tail end connector is 5-15 degree.
By using above-mentioned technical proposal, further such that tail end connector be threadedly engaged with fracture site it is easy to operate.
The utility model is further arranged to: the connecting hole is hexagonal hole.
By using above-mentioned technical proposal, using connecting hole, so that the installation of lag screw is easy to operate.
The utility model is further arranged to: the limit plate is the regular hexagon ring flat-plate cooperated with connecting hole inner wall.
By using above-mentioned technical proposal, using regular hexagon ring flat-plate, so that limit plate uniform force, extends limit plateService life.
In conclusion the utility model has the following beneficial effects: making two sides convenient for closely drawing fracture site two sides over to one's sideFracture site healing is close, reduces hollow screw and occurs the case where loose or dislocation in fixation procedure；Avoid double end forcing screwThe case where fracture site is generated into crack backwards to extruding in disassembly generation；It is contradicted using limit plate and connecting hole inner wall, justIt is rotated in limitation screw body and tail end connector relative circumferential；It is contradicted using limit plate with hole end surface is connect, convenient for limitation spiral shellNail ontology and tail end connector are mutually disengaged inserting state；It is threadedly engaged tail end connector with fracture site easy to operate, justIt is buried in people's bone head in by tail end connector, reduces tail end connector to the excitation of surrounding tissue.
Detailed description of the invention
Fig. 1 is the structural schematic diagram in the utility model embodiment.
In figure: 1, screw body；11, the front end body of screw；12, tail end connector；13, guide pin through-hole；14, jack；15, evenConnect hole；16, thread segment；17, limit plate.
Specific embodiment
The utility model is described in further detail below in conjunction with attached drawing.
Embodiment: a kind of multifunctional double-headed forcing screw, as shown in Figure 1, including screw body 1,1 both ends of screw body pointIt She You not the front end body of screw 11 and tail end connector 12.Screw body 1 is equipped with guide pin through-hole 13, guide pin along own axes direction13 both ends of through-hole stretch out the end face of the front end body of screw 11 and tail end connector 12 respectively.In the reduction of the fracture, first in fracturesBore fixation hole in position；Then guide pin is placed in fixation hole by electric drill；Then by guide pin and 13 grafting of guide pin through-hole, make front end spiral shellRivet nut 11, screw body 1 and tail end connector 12 are moved along guide pin extending direction.
12 surface of tail end connector is equipped with thread segment 16, the hand of spiral of thread segment 16 and the spiral side of the front end body of screw 11To identical, the screw pitch of thread segment 16 is less than the screw pitch of the front end body of screw 11.End of the tail end connector 12 far from the front end body of screw 11Portion is equipped with the connecting hole 15 connected for electric drill, and tail end connector 12 is equipped with the jack 14 being connected to connecting hole 15, screw body 1With 14 grafting of jack.The end that screw body 1 is inserted into jack 14 is equipped with the limit plate 17 contradicted with 15 inner wall of connecting hole.It utilizesThe screw pitch of thread segment 16 is less than the screw pitch of the front end body of screw 11, when in front end, the body of screw 11 and fracture site side are threadedly engaged,Thread segment 16 on tail end connector 12 is threadedly engaged with the fracture site other side, and the front end body of screw 11 shoots speed greater than tailThat holds the thread segment 16 on connector 12 shoots speed, convenient for closely drawing fracture site two sides over to one's side, is cured two sides fracture siteIt closes closely, reduces hollow screw and occur the case where loose or dislocation in fixation procedure.Using screw body 1 and 14 grafting of jack,During dismantling double end forcing screw, the back-out speed of the front end body of screw 11 is greater than the thread segment 16 on tail end connector 12Back-out speed avoid double end forcing screw from carrying on the back fracture site in disassembly so that screw body 1 is moved along 14 direction of jackThe case where generating crack to extruding generation.Contradicted using limit plate 17 and 15 inner wall of connecting hole, convenient for limitation screw body 1 withThe rotation of 12 relative circumferential of tail end connector.It is contradicted using limit plate 17 and 15 end face of connecting hole, convenient for limitation screw body 1 and tailEnd connector 12 is mutually disengaged inserting state.
The screw pitch of thread segment 16 and the screw pitch ratio of the front end body of screw 11 are 0.5-0.8, use 0.8 in the present embodiment, makeDouble end forcing screw is obtained slowly to draw fracture site two sides over to one's side.
Tail end connector 12 is round estrade, and the diameter of round estrade is along tail end connector 12 towards the direction of the front end body of screw 11It is gradually reduced.The diameter of thread segment 16 increases direction along the diameter of round estrade and is gradually incremented by, and makes tail end connector 12 and fracturesPosition be threadedly engaged it is easy to operate, convenient for tail end connector 12 is buried in people's bone head, reduce tail end connector 12 to surrounding tissueExcitation.
The tilt angle of round estrade is 5-15 degree, and the tilt angle of round estrade uses 10 degree in the present embodiment, so that tail endConnector 12 is threadedly engaged easy to operate with fracture site.
Connecting hole 15 is hexagonal hole, using connecting hole 15, so that the installation of lag screw is easy to operate.Limit plate 17For the regular hexagon ring flat-plate cooperated with 15 inner wall of connecting hole, using regular hexagon ring flat-plate, so that 17 uniform force of limit plate, extendsThe service life of limit plate 17.
Working principle: it is less than the screw pitch of the front end body of screw 11, the body of screw 11 and bone in front end using the screw pitch of thread segment 16When folding part position side is threadedly engaged, the thread segment 16 on tail end connector 12 is threadedly engaged with the fracture site other side, front end spiral shellThe speed of shooting of rivet nut 11 shoots speed greater than the thread segment 16 on tail end connector 12, convenient for fracture site two sides are closeIt draws over to one's side, keeps fracture site healing in two sides close, reduce hollow screw and occur the case where loose or dislocation in fixation procedure.Utilize spiral shellOntology 1 and 14 grafting of jack are followed closely, during dismantling double end forcing screw, the back-out speed of the front end body of screw 11 is greater than tail endThe back-out speed of thread segment 16 on connector 12 avoids double end forcing screw so that screw body 1 is moved along 14 direction of jackThe case where fracture site is generated into crack backwards to extruding in disassembly generation.It is supported using limit plate 17 and 15 inner wall of connecting holeTouching rotates convenient for limitation screw body 1 and 12 relative circumferential of tail end connector.It is supported using limit plate 17 and 15 end face of connecting holeTouching is mutually disengaged inserting state convenient for limitation screw body 1 and tail end connector 12.
This specific embodiment is only the explanation to the utility model, is not limitations of the present invention, abilityField technique personnel can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, butAs long as all by the protection of Patent Law in the scope of the claims of the utility model.