Summary of the invention
The present invention in view of the above-mentioned prior art situation and complete, its purpose is to provide one kind to be able to suppress stripped thread windDanger and the holdfast for being conducive to bone growth.
For this purpose, the present invention provides a kind of holdfast of fixed soft tissue on the one hand comprising: rivet nut, it is in long strip,The periphery of the rivet nut has screw thread, and in the periphery of the rivet nut, is additionally provided with the length direction along the rivet nutAt least two grooves, the groove run through the rivet nut along the length direction of the rivet nut, wherein the rivet nut also has edgeWidth direction setting threading hole.
In the present invention, since the periphery in holdfast is provided at least two or more grooves, doctor is using dressA possibility that stripped thread phenomenon occurs can be reduced when twisting with tool and squeeze nail, can be improved the operating efficiency of doctor.In addition, due toGroove runs through rivet nut along the length direction of rivet nut, therefore rivet nut is conducive to the discharge of bone bits when being implanted to bone tissue, meanwhile,Threading hole runs through rivet nut along width direction, therefore rivet nut can have higher structural strength.In addition, bone tissue is in growthTend to first grow in groove, this not only contributes to bone tissue and finds impetus to promote the reparation of damage location, moreover it is possible toEnough and holdfast forms occlusion structure and a possibility that holdfast displacement occurs to reduce, additionally it is possible to be better protected from holdfast loosening.
In addition, optionally, further including and the nail in the holdfast of fixed soft tissue involved in one aspect of the inventionThe ailhead of body connection, the ailhead are in the form of a column.Thereby, it is possible to enter osseous tunnel convenient for holdfast.
In addition, optionally, the rivet nut is selected from doctor in the holdfast of fixed soft tissue involved in one aspect of the inventionMore than at least one of being worked as with stainless steel, platinum, titanium alloy, ti-ni shape memory alloy, cochrome, magnesium alloy.In this feelingsUnder condition, holdfast is manufactured by using above-mentioned material, enables to the strength of materials of holdfast high, it is fixed, it reduces and slidesA possibility that silk and a possibility that be displaced in osseous tunnel.
In addition, in the holdfast of fixed soft tissue involved in one aspect of the invention, optionally, the material of the rivet nutIt is polyether-ether-ketone.In this case, the strength of materials for the holdfast being made of polyetheretherketonematerials materials is approached with bone, as a result, canIt is enough to reduce the possibility for generating stress shielding, and taken out without second operation.
In addition, in the holdfast of fixed soft tissue involved in one aspect of the invention, optionally, the material of the rivet nutSelected from polylactic acid material, polycaprolactone, polydioxanone, more than at least one of polyglycolic acid is worked as, or it is selected fromIn random copolymer or block copolymer more than binary in lactide, caprolactone, Lanthanum Isopropoxide and glycolideMore than one.In this case, holdfast is manufactured by using absorbable material, not only avoids the generation of second operation,Also avoiding the bring inconvenience that stays in the body not can be carried out nuclear magnetic resonance check for example, or will cause the inflammation such as synovitisGeneration.
In addition, in the holdfast of fixed soft tissue involved in one aspect of the invention, optionally, the threading hole settingIn the ailhead and run through the ailhead.It as a result, can also be by suture pair while the structural strength for ensuring holdfastTissue is sutured.
In addition, optionally, the rivet nut has remote in the holdfast of fixed soft tissue involved in one aspect of the inventionEnd and proximal end, width of the groove in the proximal end are greater than the groove in the width of the distal end.In this case, anchorNail can be extruded from osseous tunnel during entering osseous tunnel by being considered to be worth doing bone using groove, can be convenient for discharge residual boneBits.
In addition, in the holdfast of fixed soft tissue involved in one aspect of the invention, optionally, the proximal end of the rivet nutAlso there is the protrusion along the length direction.Thereby, it is possible to be cooperated with assembly tool, twisted convenient for assembly tool.
In addition, in the holdfast of fixed soft tissue involved in one aspect of the invention, optionally, the ailhead with it is describedRivet nut is integrally formed.The possibility that thereby, it is possible to avoid ailhead from separating with rivet nut improves the reliability for squeezing nail.
In addition, optionally, also having along described in the holdfast of fixed soft tissue involved in one aspect of the inventionLength direction runs through the through-hole of the rivet nut.In this case, using assembly have when can be carried out by through-hole positioning andConvenient for being considered to be worth doing from through-hole discharge bone, and can be easily crowded to be easily removed via through-hole injection lubricating fluid when taking out holdfastNail pressing.
In addition, optionally, the rivet nut has extremely in the holdfast of fixed soft tissue involved in one aspect of the inventionFew two threading holes arranged along the length direction, each threading hole are spaced each other.Thereby, it is possible to facilitate seamZygonema knots inside holdfast.
In addition, optionally, the rivet nut has remote in the holdfast of fixed soft tissue involved in one aspect of the inventionEnd and proximal end, screw pitch screw pitch than the screw thread in the proximal end of the screw thread in the distal end are big.As a result, can not onlyDamage of the screw to ligament is reduced, but also can be conducive to squeeze fixation of the nail in osseous tunnel.In addition, of the invention oneIt is fixed involved in aspect in the holdfast of soft tissue, optionally, the screw thread is tooth form screw thread.Thereby, it is possible to increase holdfast withFrictional force between osseous tunnel.
In addition, optionally, the crest of the screw thread has in the holdfast of fixed ligament involved in one aspect of the inventionThere is chamfering.Thereby, it is possible to reduce a possibility that holdfast causes secondary injury to osseous tunnel and ligament.
In addition, in the holdfast of fixed soft tissue involved in one aspect of the invention, optionally, the crest of the screw threadFor flat-head type or dome type.Thereby, it is possible to reduce the manufacture craft difficulty of holdfast, and avoid causing cutting damage to ligament.
In addition, another aspect provides a kind of assembly of holdfast tools, which is characterized in that for operating above-mentionedHoldfast described in one.Thereby, it is possible to facilitate the implantation of holdfast.
According to the present invention, a kind of holdfast for being able to suppress stripped thread risk and being conducive to bone growth and operation are providedThe assembly of holdfast has.
Specific embodiment
Hereinafter, explaining the preferred embodiment of the present invention in detail with reference to attached drawing.In the following description, for identicalComponent assign identical symbol, the repetitive description thereof will be omitted.Scheme in addition, attached drawing is only schematical, the mutual ruler of componentVery little shape of ratio or component etc. can be with actual difference.
It should be noted that term " includes " and " having " and their any deformation in the present invention, such as wrappedInclude or the process, method, system, product or equipment of possessed a series of steps or units are not necessarily limited to be clearly listed thatA little step or units, but may include or with being not clearly listed or for these process, methods, product or equipmentIntrinsic other step or units.
Fig. 1 is to show the solid of an angle of the holdfast 1 that soft tissue is fixed involved in embodiments of the present inventionStructure chart.
In the present embodiment, holdfast 1 may include rivet nut 11.Rivet nut 11 can be in long strip, the periphery tool of rivet nut 11There is screw thread, and in the periphery of rivet nut 11, is additionally provided at least two grooves 111 of the length direction along rivet nut 11, groove111 run through rivet nut 11 along the length direction of rivet nut 11, wherein rivet nut 11 also has the threading hole being arranged along width direction(121,122).Holdfast 1 involved in present embodiment is otherwise referred to as bone anchors or bone nail etc. in orthopaedics implantation field.
In the present embodiment, when using the holdfast 1 for fixing soft tissue involved in present embodiment, order can be passed throughEntire holdfast enters in osseous tunnel, and is connected by suture with bone tissue, to have the function that fixed bone tissue and reparation.It is logicalIt crosses holdfast 1 provided by the present invention effectively to fix soft tissue such as ligament by holdfast, guarantees the healing of ligament.
Fig. 2 be show the holdfast 1 that soft tissue is fixed involved in embodiments of the present invention another angle it is verticalBody structure chart.Fig. 3 is to show the top view for the holdfast 1 that soft tissue is fixed involved in embodiments of the present invention.Fig. 4 is to showAnother exemplary three-dimensional structure diagram of the holdfast 1 of soft tissue is gone out to fix involved in embodiments of the present invention.Fig. 5 is to showThe section plan of the holdfast 1 of soft tissue is fixed involved in embodiments of the present invention.
In the present embodiment, as depicted in figs. 1 and 2, the holdfast 1 that soft tissue is fixed involved in present embodiment can be withIncluding rivet nut 11.Rivet nut 11 can be in long strip with its.In some instances, rivet nut 11 can be in the form of a column.In addition, rivet nut 11 may be used alsoWith it is cylindrical, by contracting shape, round table-like or irregular shape etc..Rivet nut 11 can be used according to different application scenarios as a result,Different shapes.
In general, generally first needing to pass through drilling in bone tissue when fixing and repairing using the progress soft tissue of holdfast 1(such as passing through electric drill machine) forms osseous tunnel.Then, then holdfast 1 is implanted into osseous tunnel and is consolidated soft tissue by sutureIt is fixed, to play the role of fixed soft tissue and reparation.
In addition, in the present embodiment, holdfast 1 can also include the ailhead 12 connecting with rivet nut 11.There is nail in holdfast 1In the case where head, holdfast 1 may include rivet nut 11 and ailhead 12, and here, the line of demarcation of rivet nut 11 and ailhead 12 is not absolute, it is in Fig. 5 merely to schematically illustrate.
In some instances, ailhead 12 can be in the form of a column, and the side that ailhead 12 is relatively large in diameter is connected with rivet nut 11.ByThis, can enter osseous tunnel convenient for holdfast 1.
In other examples, ailhead 12 can also be in by contracting shape.Thereby, it is possible to facilitate access in osseous tunnel.
In some instances, threading hole (121,122) can be set in ailhead and through ailhead 12.It is ensuring as a result,Tissue can also be sutured by suture while the structural strength of holdfast 1.
In some instances, rivet nut 11 can be with only one threading hole 123 (see Fig. 4).Specifically, threading hole 123 canTo run through ailhead 12 in the width direction.
In some instances, the proximal end of rivet nut also has the protrusion (not shown) along the length direction.Thereby, it is possible toCooperated with assembly 2 (being described later on) of tool, is twisted convenient for assembly tool.In some instances, protrusion can be in the form of a column.ToolFor body, protrusion can be in for example cylindric, prism-shaped or other irregular shapes.Thereby, it is possible to be turned round convenient for assembly tool 2It is dynamic.
In other examples, rivet nut 11 can have at least two alongst arrange threading hole (121,122), each threading hole (121,122) is spaced each other.Thereby, it is possible to facilitate suture to knot inside holdfast 1.Show someIn example, rivet nut 11 can have the first threading hole 121 and the second threading hole 122 (see Fig. 5).Wherein, the first threading hole 121 andTwo threading holes 122 are spaced each other.
In some instances, suture knot can be arranged inside holdfast 1.In such a case, it is possible to prevent from settingThe knot in bone surface is set because loosening caused by the factors such as friction, improves the stability of suture.
In other examples, threading hole (121,122) can be set into for example round, oval, rectangular, interior hexagonal,The shapes such as inner cross.
In other examples, ailhead 12 can be integrally formed with rivet nut 11.In this case, ailhead 12 and rivet nut11 are formed as one molding, thus, it is possible to avoid being separated from each other ailhead 12 with rivet nut 11 in the operating process of holdfast 1, thusThe possibility that holdfast 1 caused by avoiding because of separation slips.
In addition, in the present embodiment, the material of holdfast 1 can be selected from polylactic acid material, polycaprolactone, gather to dioxyCyclohexanone, one or more compositions in polyglycolic acid.In addition, in some instances, the material of holdfast 1 can also be selected from thirdIn random copolymer or block copolymer more than binary in lactide, caprolactone, Lanthanum Isopropoxide and glycolideOne or more compositions.In addition, in other examples, holdfast 1 can also by polyorthoester (POE), poly- even phosphorus nitrogen, it is poly- inIt is one or more in ester, polyester urethane, polyanhydride imine copolymer, Biopol GO 4 and its copolymer, polyaminoacid (PAA)Composition.
In other examples, the material of holdfast 1 can also be polyether-ether-ketone.In this case, by polyether-ether-ketone materialExpect that the strength of materials and the bone of the holdfast 1 constituted are close, thereby, it is possible to reduce the possibility for generating stress shielding, and without secondaryOperation is taken out.
It in the present embodiment, not only can be to avoid secondary taking-up hand by using holdfast 1 made of above-mentioned materialArt, and also avoid metal anchoring nail 1 and stay in the body brought inconvenience, such as not can be carried out nuclear magnetic resonance check, orPerson will cause inflammation such as synovitis etc..In addition, being especially the holdfast 1 made of the absorbable materials such as polylactic acid material (PLA)Also have the function of promoting bone tissue healing.
In the present embodiment, holdfast 1 can also be closed by medical stainless steel, platinum, titanium alloy, ti-ni shape memory alloy, cobalt chromiumOne or more compositions in gold or magnesium alloy.In this case, holdfast 1 can also effectively act as fixed soft tissueEffect.Since above-mentioned material is compared with by absorbable material, price is relatively low and the strength of materials is high, fixed, is droppingA possibility that low generation stripped thread and a possibility that be displaced in osseous tunnel in terms of show it is more outstanding.
Fig. 7 is to show the partial schematic diagram of holdfast 1 shown in fig. 6.Fig. 8 is shown involved by embodiments of the present inventionAnd holdfast 1 plan view.
With reference to Fig. 1, the periphery of rivet nut 11 can have screw thread.In the present embodiment, the spiral shell of 11 periphery of rivet nut is setLine can be tooth form screw thread.Thereby, it is possible to increase the frictional force between holdfast 1 and osseous tunnel.
In the present embodiment, the periphery of rivet nut 11 can be set to UNR screw thread.UNR screw thread namely circular arc tooth bottom are constantThe unified screw thread of screw pitch.
In some instances, screw thread may be arranged as circular arc tooth bottom coarse thread series and unify screw thread (UNRC), circular arc tooth bottomClosely-pitched series unifies screw thread (UNRF), circular arc tooth baselap closely-pitched series unifies screw thread (UNREF) or circular arc tooth bottom particular series systemOne screw thread (UNRS).
In other examples, screw thread can also be Standard Whiworth coarse thread series, general service cylindrical thread British StandardInch screw thread (B.S.W.), Standard Whiworth closely-pitched series of the BS84 thread form angle for 55 jiaos, general service cylindrical thread (B.S.F.),Series, the odd-pitch screw (Whit), constant of general service cylindrical thread (Whit.S), Hui Shi tooth form may be selected in additional Hui ShiThe unified screw thread (UN) of screw pitch series, the unified screw thread (UNC) of coarse thread series, closely-pitched series unified screw thread (UNF), ultra-fine toothThe unified screw thread (UNEF) of series or the unified screw thread of particular series (UNS is 1.).In such a case, it is possible to be made according to differentDifferent screw threads is selected with environment, so that holdfast 1 be made to can adapt to different application scenarios.
In addition, as shown in figure 8, in the present embodiment, rivet nut 11 can also have alongst close to soft groupThe distal end knitted and the proximal end far from soft tissue.Here, for convenience of explanation, enter the successive suitable of osseous tunnel according to rivet nut 11The both ends of rivet nut 11 are divided into the distal end and the proximal end opposite with distal end for first contacting tissue or soft tissue by sequence.
In the present embodiment, screw pitch of the screw thread screw pitch H1 at the far end than screw thread in proximal end set by 11 periphery of rivet nutH2 is big, that is, the screw thread of the screw thread nearer end of distal end will be dredged.In this case, compared with the screw thread of proximal end, the spiral shell of distal endLine relatively dredges (namely screw pitch is relatively large), and therefore, when rivet nut 11 is implanted to osseous tunnel, the distal portions of rivet nut 11 canIt reduces to the soft tissue injury in osseous tunnel, and the proximal part of rivet nut 11 can also increase between holdfast 1 and osseous tunnelFrictional force enters osseous tunnel and is fixed therein to be conducive to holdfast 1.
In addition, as shown in Figure 6 and Figure 7, in the present embodiment, the crest of screw thread set by 11 periphery of rivet nut can haveThere is chamfering.In the present embodiment, θ can be equal to crest two sides the sum of flank angle, for example, 30~60 °.Thereby, it is possible to dropA possibility that low holdfast 1 causes secondary injury to osseous tunnel and soft tissue.
In other examples, the chamfering of the crest of screw thread set by 11 periphery of rivet nut can be flat-head type or domeType.Thereby, it is possible to reduce the sharpness of the screw thread of holdfast 1, it can be avoided holdfast 1 and cutting damage caused to soft tissue.
In addition, being also provided at least two grooves of the length direction along rivet nut 11 in the periphery of rivet nut 11111.Wherein, groove 111 can run through rivet nut 11 along the length direction of rivet nut 11.
In some instances, the periphery of rivet nut 11 can be set two (two) and two or more along rivet nut 11The groove 111 of length direction.In addition, as above, groove 111 can also run through rivet nut 11 along the length direction of rivet nut 11, that is,111 length of groove can be roughly equal with the length of rivet nut 11.In this case, holdfast 1 is being implanted into such as bone tissueDuring osseous tunnel, generated bone bits or bone slag can be easily discharged along groove 111.
In some instances, 111 length of groove also can be slightly less than the length with rivet nut 11.In addition, 111 depth of groove canTo be less than the outer radius of rivet nut 11.In some instances, rivet nut 11 can also have close soft tissue alongstDistally and far from soft tissue proximal end.In this case, by deepening 111 depth of groove of proximal end, so that proximal end and dressStress is easier to the more matching of tool 2.
It in the present embodiment, can be between groove 111 (in the present embodiment, have groove 111a and groove 111b)It is isogonism distribution, for example, groove 111a and groove 111b can be distributed in isogonism in the case where three grooves are arranged.That is,Groove 111a and groove 111b can be uniformly distributed along the periphery of rivet nut 11.In this case, the uniform force of holdfast 1,Further reduce a possibility that stripped thread occurs.
In addition, each groove 111 is also possible to non-isogonism distribution, for example, three grooves are arranged in other examplesIn the case where 111, groove 111a and groove 111b can be distributed in non-isogonism.In this case, it is arranged by non-isogonismGroove 111 can be grown with inducting osseous tissue along 111 direction of groove, this meeting in the case where having particular/special requirement to bone growthMore it is applicable in.
As above, by the way that two and two or more grooves 111 are arranged in 1 periphery of holdfast, so that doctor is using assembly tool 2It can use groove 111 when twisting holdfast 1 and increase torque, so as to only need lesser power that can twist holdfast 1, and then keep awayExempt from addition to this, doctor etc. can be further improved because local stress is excessive to cause stripped thread phenomenon to occur a possibility thatThe operating efficiency of operator.
In addition, in the present embodiment, since groove 111 can run through rivet nut 11 along the length direction of rivet nut 11, becauseThis, bone tissue is grown at groove 111 in growth Shi Huixian, in this case, is not only contributed to bone tissue and is found impetusTo promote the reparation of damage location, additionally it is possible to form occlusion structure with holdfast 1 to reduce the possibility for the displacement of holdfast 1 occurProperty.In addition, also helping the discharge of bone bits or bone slag.
In addition, as above, rivet nut 11 can also have (or newest close soft group of close soft tissue alongstKnit) distal end and far from soft tissue (or later close to soft tissue) proximal end.In addition, the groove 111 of 11 periphery of rivet nut existsThe width of proximal end is greater than the width at the far end of groove 111.In this case, holdfast 1 can be with during entering osseous tunnelIt is extruded from osseous tunnel by being considered to be worth doing bone using groove 111, convenient for discharge residual bone bits.
In addition, as shown in Figure 3 and Figure 5, in the present embodiment, holdfast 1 can also have alongst through nailThe through hole 112 of body 11.Through hole 112 can be used as the positioning action of the assembly tool for the holdfast 1 being described later on, and thus, it is possible to sidesJust through hole 112 is operated.
In the present embodiment, through hole 112 is alongst through to the second threading hole 122.Assembly tool 2 as a result,It can effectively be positioned by through hole 112.
In some instances, through hole 112 can be cylindrical through-hole.In other examples, through hole 112 may be used alsoBe triangle, rectangular or irregular shape etc..In this case, can be increased when using assembly tool 2 by through hole 112The field of load of big holdfast 1, to stablize stress, additionally it is possible to bone bits is discharged by through hole 112, and can be had with assembly2 play the role of positioning when being matched.
In addition, in some instances, through hole 112 can also have the intercommunicating pore communicated with 11 periphery of rivet nut (not schemeShow).Lubricating fluid can also be injected to 11 periphery of rivet nut by through hole 112 when taking out holdfast 1 as a result, so that holdfast 1 and boneFrictional force between tunnel reduces, so that holdfast 1 be enabled to become prone to take out.In some instances, multiple through holes 112 can be setThe intercommunicating pore (not shown) communicated with the periphery of rivet nut 11.
Fig. 9 is to show the perspective view of the assembly of holdfast involved in embodiments of the present invention tool 2.
Figure 10 is to show the bottom view of the assembly of holdfast involved in embodiments of the present invention tool 2.Figure 11 is to showThe stereoscopic schematic diagram of 2 cooperation of holdfast 1 involved in embodiments of the present invention and assembly tool.
Hereinafter, describing the assembly tool 2 of the holdfast 1 for operating fixed soft tissue in detail with reference to Fig. 9 to Figure 11.
Assembly tool 2 includes: handle part 21 involved in present embodiment；More than two stabilizer blades 22, with from handle part21 modes extended are set to handle part 21, and stabilizer blade 22 can be embedded in the groove 111 of holdfast 1；And positioning column 23, settingBetween each stabilizer blade 22, and it is embedded in the through hole 112 of holdfast 1.In this case, assembly tool 2 can be when in useBy the corresponding position of each component insertion holdfast 1, plays the role of stable stress, prevent stripped thread.
When holdfast 1 is implanted to such as osseous tunnel, assembly tool 2 can be assembled together first with holdfast 1, this fashionable dressThe groove 111 for being inserted correspondingly into holdfast 1 with the stabilizer blade 22 and positioning column 23 that have 2 and the corresponding position of through hole 112 are (referring to figure11).Then, holdfast 1 is inserted by some position by operation assembly tool 2 (the specifically handle part 21 of assembly tool 2)(osseous tunnel).Then, by operation (such as rotating clockwise) assembly tool 2, holdfast 1 can be pushed to the position of appropriate depthIt sets, so that holdfast 1 be made for example to be fixed in osseous tunnel together with soft tissue.Finally, assembly tool 2 takes along the groove 111 of holdfast 1Out.
In some instances, assembly tool 2 is also provided with the recess portion of the male cooperation of rivet nut 11 to substitute positioningColumn 23 (not shown).Thereby, it is possible to match from different holdfasts 1.
In the present embodiment, handle part 21 can be in long strip.Thus, it is possible to convenient for holding and using.Show someIn example, handle part 21 can be with spherical in shape, taper or irregular shape.Thereby, it is possible to be applied to different holding modesIn the case of.
In the present embodiment, stabilizer blade 22 can be in by contracting shape.In this case, stabilizer blade 22 near handle part 21Part is more stable, is not susceptible to the phenomenon that fractureing in force.
In some instances, stabilizer blade 22 can also be evenly sized.The difficulty of manufacture craft is reduced as a result,.
In the present embodiment, it looks along the length direction of stabilizer blade 22, each stabilizer blade 22 can be located at the same circleOn circumference.Thereby, it is possible to agree with the structure of holdfast 1.
In the present embodiment, each stabilizer blade 22 can be arranged in a manner of isogonism.That is, each stabilizer blade 22 can be uniformGround is distributed circumferentially.Thereby, it is possible to make 1 uniform force of holdfast, prevent stripped thread and the phenomenon that stabilizer blade 22 fractures.
In the present embodiment, that is arranged in a manner of isogonism can be three stabilizer blades 22.Thereby, it is possible to use stabilizer bladeThe stability obtained in the case where 22 minimum numbers.In other examples, what stabilizer blade 22 can be arranged with right and wrong isogonism, at thisIn the case of kind, the stabilizer blade 22 being arranged by non-isogonism allows the position of stabilizer blade 22 to cooperate the groove location of special holdfast 1To use.
In the present embodiment, handle part 21 and stabilizer blade 22 are integrally formed.Thereby, it is possible to avoid situations such as falling off and being brokenGeneration.
In the present embodiment, the direction orthogonal in handle part 21 can be set in handle.Thereby, it is possible to when twistingObtain preferable using effect.In addition, in some instances, handle can be in a manner of perforation along 21 orthogonal direction of handle partPenetrate through handle part 21.In addition, handle can be connected in non-through mode with handle part 21 in other examples.As a result,One position for facilitating holding can be equally provided when twisting holdfast 1, preferably hold effect to obtain.
In the present embodiment, the length of stabilizer blade 22 can be with the equal length of the groove 111 of holdfast 1.In such caseUnder, it can exert a force simultaneously to entire holdfast 1, be also reduced while improving the efficiency of power and the possibility that stabilizer blade 22 fractures occursProperty.
In other examples, the length of stabilizer blade 22 is also less than the length of the groove 111 of holdfast 1.In such caseUnder, it can adapt to the groove of different length.
In the present embodiment, the length of positioning column 23 can be identical as the length of through hole 112 of holdfast 1.ThisIn the case of, positioning column 23 can play stable stress after being embedded in through hole 112, prevent the effect of stripped thread.
In some instances, the length of positioning column 23 is also less than the length of the through hole 112 of holdfast 1.Thus, it is possible toAdapt to the through hole 112 of different length.
In the present embodiment, positioning column 23 can be cylindrical body.In addition, in some instances, positioning column 23 can be withIt is triangular prism, cuboid or polyhedron.Thus, it is possible to adapt to the shape of the through hole 112 of different holdfasts 1.
Although being illustrated in conjunction with the accompanying drawings and embodiments to the present invention above, it will be appreciated that above descriptionThe invention is not limited in any way.Those skilled in the art without departing from the true spirit and scope of the present invention may be usedTo deform and change to the present invention as needed, these deformations and variation are within the scope of the present invention.