CN1142746C - Device for connecting longitudinal support to pedicle screw - Google Patents
Device for connecting longitudinal support to pedicle screw Download PDFInfo
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- CN1142746C CN1142746C CNB961805366A CN96180536A CN1142746C CN 1142746 C CN1142746 C CN 1142746C CN B961805366 A CNB961805366 A CN B961805366A CN 96180536 A CN96180536 A CN 96180536A CN 1142746 C CN1142746 C CN 1142746C
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Abstract
The present invention relates to a device for connecting a longitudinal bracket (1) and a receptacle-shaped screw (2) by a clamping head (3). The clamping head is provided with a groove (5) used for containing the longitudinal bracket (1), and the groove can be freely selected or mixed to use among the clamping head of which the side surface is opened, the clamping head of which the upper surface is opened or the sealed clamping head, for example, the longitudinal bracket (1) is easy to insert the clamping head (3) which is opened upwards, and the clamping head of which the side surface is opened can carry out side surface correction. The connection of the receptacle-shaped screw (2) and the clamping head (3) is realized by a conical spring collet (7) arranged in the clamping head (3) and a spherical head (9) arranged on the receptacle-shaped screw (2). Therefore, the clamping head (3) can be possibly ejected and clamped later, and the receptacle-shaped screw (2) can be screwed even without the clamping head (3). Thus, when the receptacle-shaped screw is installed, the external appearance general situation is allowed to be better known. According to an execution method, a clamping tool (10) used for the longitudinal bracket (1) is arranged in a clamping screw (36) used for the spherical head (9) or is arranged in a middle element (12) to form a whole, and the clamping tool can respectively fix the longitudinal bracket (1) and the spherical head (9).
Description
Technical field
The present invention relates to a kind of device that is used in the vertebrae fixed system, connecting longitudinal carrier and pedicle screw, it has a clamping head, described clamping head has a central axis and a groove that is used to admit longitudinal carrier that moves towards perpendicular to central axis, the admittance dimple that is used for clamping tool and one that also has a upward opening is to the hollow cave with central axis that the taper of under shed is dwindled downwards, coaxial line is laid a collet with central axis slidably in the cave, this chuck is made the head that is used for flexibly admitting pedicle screw, at this moment, hollow cave upwards enters in the admittance dimple of clamping tool vertically.
Background technology
Known to have from the prior art level much to be used for the fixed pedicle screw of vertebrae (Pedikelschrauben), they have such advantage, and promptly independent pedicle screw can be independent of longitudinal carrier and be implanted.Longitudinal carrier can also be fixed afterwards from the side or from top insertion pedicle screw.This pedicle screw can for example be known from the EP-B0 330881 of SHERMAN.
The shortcoming of known pedicle screw is, is used for fixing the blocking mechanism more complicated of the longitudinal carrier that is inserted in the pedicle screw of making opening.In addition, as a rule, the head of the screw position of longitudinal carrier is relatively adjusted a limited angle, and this must spend the highland longitudinal carrier is adjusted.
Known a kind of anchoring element of this type from DE-C 195 09332, wherein, the spherical head of pedicle screw can with the elasticity cartridge clip go into can coarctate pressurizing member in, and make pedicle screw that certain setting angle can be arranged thus.The clamping of pressurizing member in clamping head according in PCT/CH92/00125 disclosed mechanism carry out, wherein, the truncated cone shape pressurizing member moves and clamped thus towards its end that dwindles in a complementary bellmouth.Because the clamping of pressurizing member, the spherical head of skeleton screw can fixed on the angle position arbitrarily.
The shortcoming of this known devices is as follows:
A) only having two structures to the hollow cylinder pressurizing member of the admittance spherical head of the longitudinal cut of under shed is to extend (along the direction of skeleton screw) along same direction.Thus, when clamping, the thin slice of pressurizing member that can not be by having otch produces the spherical head of surrounding the skeleton screw equably.This uneven encirclement of spherical head causes reducing of clamping force.
B) the skeleton screw must be installed in advance, and at this moment, it inserts and anti-ly be fixed on device with reversing by the dimple that is used for spring element from top with pressurizing member, that is to say that the skeleton screw can not be independent of the clamping head lemon and go into.Clamping head can not suit after implanting the skeleton screw.Thus, when being screwed into the skeleton screw of clamping head, cause understanding to reduce to the outward appearance overview with suit.When providing one to have the system of clamping head of different structures, according to the pre-installation by the skeleton screw of design decision, this system implants (wherein, the number of types of n=head, m=screw length number) by n * m kind and forms, and forms and not merely implanted by the n+m kind.Another shortcoming is that clamping head can not according to circumstances be changed then and there.
C) angle stability is poor, and it only allows fixedly stretching chord member;
D) with the longitudinal carrier of clamping tool while fixture and the spherical head of skeleton screw.The loosening of clamping tool causes whole fixed system malfunctioning immediately; And
E) to this, wish according to circumstances to fix being connected between the spherical head of this device and skeleton screw, and do not rely on longitudinal carrier, so that can draw back or pressurized by longitudinal carrier, and between longitudinal carrier and skeleton screw, do not have the angle loss, and this is impossible in known devices.
Summary of the invention
Herein, the present invention will manage to make to remedy.The object of the present invention is to provide a kind of device that connects a longitudinal carrier and a pedicle screw, it has following performance:
-simple to operate;
-also can be screwed into the bolt portion of this device even without clamping head;
-cartridge clip clamping head afterwards;
-can be according to circumstances and surgical hobby lateral opening, above freely selects or uses with between clamping head opening or sealing, for example, the clamping head of upward opening makes longitudinal carrier be easy to insertion, lateral opening then can carry out the side correction;
-according to the form of implementation fixing spherical head of longitudinal carrier and skeleton screw separately.
For achieving the above object, the invention provides a kind of device that is used in the vertebrae fixed system, connecting longitudinal carrier and pedicle screw, it has a clamping head, the latter has central axis, described clamping head has a central axis and a groove that is used to admit longitudinal carrier that moves towards perpendicular to central axis, the admittance dimple that is used for clamping tool and one that also has a upward opening is to the hollow cave with central axis that the taper of under shed is dwindled downwards, coaxial line is laid a collet with central axis slidably in the cave, this chuck is made the head that is used for flexibly admitting pedicle screw, at this moment, hollow cave upwards enters in the admittance dimple of clamping tool vertically
It is characterized by,
A) collet is made hollow truncated cone shape and is provided with at least four otch of trend vertically, and wherein, a part is led to the basal plane of hollow truncated cone shape collet, and a part is led to its coverage rate, and
B) collet then can radially be compressed to pressing down also directly or indirectly vertically by clamping tool.
Further preferably, at least 6 preferably at least 8 otch have been done on the collet.
Advantageously, hollow truncated cone shape collet has one 3 °～8 ° semi-cone angle α/2 that are preferably 5 °～7 °.
Advantageously, there are one 3 °～8 ° semi-cone angle α/2 that are preferably 5 °～7 ° in the hollow cave of truncated cone shape.
Advantageously, hollow truncated cone shape collet can compress about 0.8～1.2mm along diameter, preferably about 0.9～1.1mm.
Advantageously, hollow truncated cone shape collet can extend about 0.3～0.6mm along diameter, preferably about 0.35～0.45mm.
Admit the clamping head of longitudinal carrier to form according to device of the present invention by one, therein, later cartridge clip is gone into one and is preferably had the pedicle screw of spherical head and be fixed.Clamping head can by desired number and modification simply cartridge clip be implanted on the intravital pedicle screw with spherical head of vertebra so that can between longitudinal carrier and pedicle screw, set up main being connected.By clamping tool is screwed in the fixture, can be locked at longitudinal carrier in the device with direction of rotation vertically simultaneously and angle is stably fixed this device.At this moment, to be pressed in as the adjustment screw of clamping tool on the longitudinal carrier that inserts in the device, the latter is pressed on the hollow truncated cone body of alternately making otch, and the latter itself is because the taper of endoporus of the head of fixture and pressurized, and clamps the preferred spherical head of pedicle screw thus securely.For power is passed on the hollow truncated cone body from longitudinal carrier best, advantageously, between longitudinal carrier and hollow truncated cone body, insert an inflexible intermediary element.According to the configuration of intermediary element and clamping tool, can also divide the preferred spherical head of open locking longitudinal carrier and skeleton screw in the present invention.
Thus, compare with known devices, has such advantage according to device of the present invention, be that pedicle screw not only can accurately be fixed perpendicular to longitudinal carrier, and can allow and one can reach ± 25 ° angular deflection, but also can according to the thickness between its 4～10mm, the lateral deviation between longitudinal carrier and the pedicle screw be compensated to certain degree according to the center of rotation of clamping head and the distance between the longitudinal carrier axis.When longitudinal carrier was inaccurately crooked, this was a particular importance, and this bending will cause very big difficulty when mounted in common system.Another advantage according to device of the present invention is according to the version of rigidity intermediary element and clamping tool or the version of device, can divide the preferred spherical head of open locking longitudinal carrier and skeleton screw.
One according to device of the present invention preferably is improved to, the preferred spherical head of pedicle screw preferably do one its be shaped as the structure of traverse furrow or cross rib so that obtain better fixing (with respect to tightening of collet).
Angle stability can also improve thus more, and promptly head of screw is made by harder material (for example titanium aluminum niobium alloy), and the softer material (for example titanium of soft state) of hollow truncated cone body and function of alternately making otch is made.
Another probability that improves angle stability is to make coarse with a three dimensional structure that for example is shaped as groove the preferred spherical head and/or the complementary hole in the hollow truncated cone body of pedicle screw.
Thus, being made in the structure that the material by harder on the head of screw makes is pressed in the softer material of hollow truncated cone body.
Advantageously, the ballhead of pedicle screw and the diameter of the corresponding dimple in the collet be 6 and 10mm between, be preferably 7.5 and 8.5mm between.
Advantageously, the distance between the longitudinal axis of ballhead and longitudinal carrier 4 and 10mm between, be preferably 6 and 8mm between.
Made interior hexagonal dimple on the spherical head for pedicle screw being screwed in the skeleton, being preferably in.When but the head of cartridge clip is also drilled through, can only be screwed into pedicle screw selectively or be screwed into whole device simultaneously.Back one situation at first has such advantage, promptly whenever can further be screwed into or back stubborn this device, so that can accomplish to make uniform height.
Knownly for example compare according to the cartridge clip mechanism of US-A-5 549 608 with other, the cartridge clip mechanism used according to the present invention also has another advantage, and promptly after cartridge clip successfully, the operation that the connection of having set up can not be passed through to be taked is by mistake unclamped.If think to unclamp again wittingly the connection of having set up, then must need special instrument for this reason.
Description of drawings
The present invention will be described in more detail according to different embodiment below with improvement of the present invention.Among the figure:
Fig. 1 shows the perspective exploded view according to device of the present invention, and it has the clamping head with longitudinal carrier upward opening together, and one has the pedicle screw and a clamping tool of spherical head;
Fig. 2 show along among Fig. 1 according to the longitudinal sectional view of the central axis of apparatus of the present invention;
Fig. 3 shows the perspective view according to improved device of the present invention, and it has the groove of sealing, is used to admit a longitudinal carrier and a clamping tool;
Fig. 4 shows the perspective view according to improved device of the present invention, and it has the groove of lateral opening (rather than upward opening), is used to admit a longitudinal carrier and a clamping tool;
Fig. 5 shows the perspective view according to improved device of the present invention, and it has the groove of lateral opening, is used to admit a longitudinal carrier and one additional, as to be used for fixing longitudinal carrier sleeve and nut;
Fig. 6 shows the perspective view according to improved device of the present invention, and wherein, longitudinal carrier and central axis are from a distance;
Fig. 7 shows the perspective view according to improved device of the present invention, and wherein, the preferred spherical head of longitudinal carrier and skeleton screw can be pinned respectively;
Fig. 8 shows the longitudinal profile according to improved device of the present invention, and it has the disclosed performance as Fig. 7, but such difference is arranged, and the adjustment screw that promptly is used for fixing the preferred spherical head of longitudinal carrier and skeleton screw is mechanically thrown off, and
Fig. 9 shows the longitudinal profile according to of the present invention improved device corresponding with Fig. 8, and it has such advantage, and promptly longitudinal carrier can be from top insertion.
The specific embodiment
In mainly forming shown in Fig. 1 and 2 by clamping head 3 according to device of the present invention, it has a central axis 4 and a yoke shape groove 5 that is used to admit longitudinal carrier 1 perpendicular to the upward opening of central axis 4, with one to the hollow cave 6 of truncated cone shape under shed, that taper is dwindled downwards, that have central axis 4, axially place a hollow conical helical spring chuck 7 with alternative groove 8 movably in the cave, it is designed for admitting the head 9 of pedicle screw 2.
As shown in Figure 2, the hollow cave 6 of truncated cone shape should have one to be roughly 6 ° semi-cone angle α/2.Hollow conical helical spring chuck 7 with alternative groove 8 has 6 ° semi-cone angle α/2 of being roughly of a correspondence.Collet 7 can magnify about 0.4mm owing to its groove 8 and compress as many as 1mm on diameter, so that the head 9 of pedicle screw 2 can flexibly snap in wherein.For this purpose, concave surface is made in the inside of collet 7, is fit to do into the sphere of hollow.
Hollow cave 6 is vertically upwards so far in the arrival slot 5, thus collet 7 and position preferably hollow columniform intermediary element 12 (for example making the shape of packing ring) thereon can by the longitudinal carrier in the insertion groove 51 (when support with clamping tool 10 when axial and direction of rotation are fixed in the groove 5) be pressed downward vertically.Simultaneously, pressing in the hollow cave 6 of preferably truncated cone shape of tapered reduction downwards, moving axially down along with collet 7, the diameter of collet 7 diminishes, so that original clamped firmly and be fixed by its position with respect to clamping head 3 (thus with respect to longitudinal carrier 1) from the head 9 of the pedicle screw 2 that flexibly snaps in down in collet 7.Because the disengagement of collet 7 and intermediary element 12 forms encircling uniformly of head 9, makes the intensity that is connected with a best between clamping head 3 and the pedicle screw 2.
Clamping tool 10 has an external screw thread 19, and groove 5 has a corresponding with it female thread 21 in the scope of two yoke shape lower limbs 20.For adjustment screw 19 is screwed in the female thread 21, a transverse incision 22 and a female thread 30 are arranged in the top, so that can admit the operation tool (not shown) of corresponding configuration.Also can for example replace this transverse incision and female thread with interior hexagon dimple.
The function of intermediary element 12 can therein a uniform as far as possible power be passed to collet 7 from longitudinal carrier, otherwise the latter may be easily in 6 medium dip of hollow cave just under special circumstances.
The head 9 of pedicle screw 2 preferably is provided with hexagon dimple 23 in the top, so that pedicle screw 2 can be screwed in the skeleton with a hexagon tap wrench.
Figure 3 illustrates a kind of modification according to device of the present invention, wherein, that clamping head 3 has is one 5 that be communicated with groove, the threaded through hole 13 of upward opening, the clamping tool 10 of hexagon dimple 24 can be screwed in this hole in the band, like this, the longitudinal carrier 1 in the insertion groove 5 just can be fixed with direction of rotation vertically.
Figure 4 illustrates the another kind of modification according to device of the present invention of Fig. 3, wherein, groove 5 opens wide to the side, so that can admit longitudinal carrier 1 from the side, this can have some advantage to the inside operation.Clamping tool 10 also can have a transverse incision 22 and a female thread 30, with hexagon dimple 24 in replacing.Transverse incision 22 and female thread 30 are used to admit one (not shown) operation tool in the case.
Figure 5 illustrates the another kind of modification according to device of the present invention, wherein, groove 5 is the same with the modification of Fig. 4, opens wide to the side.But clamping head 3 thereon the section 14 have the band transverse incision 25 external screw thread 15 and female thread 30, by it, the band dimple 18 hollow cylindrical sleeve 16 longitudinal carrier 1 can be covered.Sleeve 16 can be with on the longitudinal carrier 1 that is tightened on the nut 17 in the insertion groove 5, on the one hand longitudinal carrier 1 is fixed in axial and direction of rotation, it is pressed on the intermediary element 12 or by opening 11 on the other hand and is pressed on the collet 7, this nut has the female thread corresponding with external screw thread 15.
In the another kind of modification according to device of the present invention shown in Fig. 6, clamping head 3 is made slab-shaped; It also comprises groove 5 perpendicular to the longitudinal carrier 1 of (all around sealing) admittance band longitudinal axis 32 of axis except the tapered hollow cave 6 with medial axis 4 that dwindles downwards.Press structural requirement, the distance between the longitudinal axis 32 of central axis 4 and longitudinal carrier 1 is at least half of diameter sum in longitudinal carrier 1 and hollow cave 6.The fixing of collet 7 realizes that by clamping tool 10 latter is pressed to supporting bead 12.This supporting bead 12 can not have big problem ground yet and removes in this form of implementation, so that make clamping tool directly press to collet 7.By the pressure on collet 7, to lower slider and contracted diameter thus, so that the spherical head 9 of inserting preferably pedicle screw 2 wherein is locked the latter in the tapered hollow cave 6 that dwindles.
In this form of implementation, the fixing of longitudinal carrier can realize that by an additional adjustment screw 31 it is screwed into from above in the hole that is communicated with groove 5, until leaning against on the longitudinal carrier 1 individually.
The preferred spherical head 9 of pedicle screw 2 can be provided with a device with hexagon dimple in replacing, so that can add a prolongation (not shown), the latter can be by clamping tool 10 operation pedicle screws 2 (this is a prerequisite with big through hole).Between pedicle screw 2 and the prolongation be connected preferably reversible and rotation, draw and pressure aspect be stable.
In the modification shown in Fig. 7, show the application of clamping tool 10 and pinching screw 36 according to device of the present invention.Thus, can be individually fixedly longitudinal carrier 1 and pedicle screw 2.Pinching screw 36 is screwed in the clamping head and the fixing spherical head 9 of pedicle screw 2 only.Thus, screw can with the spherical head 9 of locking longitudinally support 2 move, and can not lose angle between longitudinal carrier 1 and the pedicle screw 2.The clamping tool 10 that is used for fixing longitudinal carrier is made of one in pinching screw 36.Fixedly after the spherical head 9, tighten clamping tool 10, by pinching screw 36 to pin longitudinal carrier 1.The admittance of longitudinal carrier 1 in clamping head 3 can realize by the groove 5 of a upward opening as shown in Figure 1.Can admit longitudinal carrier 1 by a hole as shown in Figure 3 equally, or admit longitudinal carrier 1 by a groove 5 that is made in lateral opening according to Fig. 4.Also can be according to Fig. 8 by the longitudinal carrier 1 in the 43 admittance intermediary element 12 of a hole.In order to simplify installation, on according to Fig. 1, in the clamping head 3 of opening, can adopt intermediary element 12 according to the groove that is provided with top opening 37 of Fig. 9.But, different with Fig. 8 and 9, intermediary element 12 is upward opening always, till clamping tool 10 directly is pressed on the longitudinal carrier 1 in the clear.So longitudinal carrier 1 can be from top insertion intermediary element 12.Aforesaid intermediary element 12 is discharged on longitudinal carrier do not need.Intermediary element can be done lateral groove 5 equally as Fig. 4.The installation of intermediary element 12 is preferably carried out from a side of collet 7.Eaves limit (Bord) 39 on the intermediary element 12 prevents that intermediary element 12 from upwards skidding off from clamping head 3.It skids off downwards and will prevent by clamping element 7.Adopting because when the clamping head 3 of groove 5 and upward opening and a pinching screw 36, a safety sleeve 41 prevents that when tightening pinching screw 36 clamping head from opening.Also can be to as shown in Figure 9 similar, replace pinching screws 36 with a binding nut 38.
Figure 8 illustrates another modification according to device of the present invention.As in the modification shown in Fig. 7, one second pinching screw 36 is by the fixing spherical head 9 of intermediary element 12, and clamps longitudinal carrier 1 insecurely.Different with modification shown in Figure 7, the clamping tool 10 that is used for fixing longitudinal carrier 1 is integral toward the intermediary element 12 that rises and do female thread 42 herein with further.Intermediary element 12 has a screwed hole 42 sealing, upward opening.The bottom of the sealing of intermediary element 12 allows it to be pressed in equably on the collet 7.The admittance of longitudinal carrier 1 in clamping head 3 can realize by the groove 5 of upward opening as shown in Figure 1.The admittance of longitudinal carrier 1 also can realize by a hole or realize by the open trough 5 of making in the side just like Fig. 4 as shown in Figure 3.The admittance of longitudinal carrier 1 in intermediary element 12 also can realize by hole 43.But, before longitudinal carrier 1 is placed in the clamping head 3, must intermediary element 12 be arranged on the longitudinal carrier 1 at this.When the diameter of longitudinal carrier 1 be about female thread 42 root diameter (RD) 3/5 the time, as shown in Figure 7, have the groove 5 of a upward opening also to be fine on the intermediary element 12.Adopting because when the clamping head 3 of groove 5 and upward opening and a pinching screw 36, a safety sleeve 41 prevents that when tightening pinching screw 36 clamping head from opening.Also can replace pinching screw 36 with a binding nut 38 with similar as shown in Figure 9.
In the outstanding part shown in Fig. 9 be according to modification of the present invention, as shown in Figure 8, by one to the intermediary element 12 that rises and therein all-in-one-piece clamping tool 10 lock longitudinal carrier.And in contrast, 7 of collets pass through binding nut 38 lockings.This binding nut 38 is pressed on intermediary element 12 and the flexible member 7.Fixing spherical head 9 thus, and needn't clamp longitudinal carrier securely.Another clamping tool 10 is the current longitudinal carrier 1 that also clamps securely in intermediary element 12.Spherical head 9 also is mechanically to throw off like this with the fixing of longitudinal carrier 1.The admittance of longitudinal carrier in clamping head 3 can realize by the groove 5 of a upward opening as shown in Figure 1.Equally, the hole that the admittance of longitudinal carrier 1 also can be by as shown in Figure 3 or by realizing just like the lateral unlimited groove 5 of being made in of Fig. 4.The admittance of longitudinal carrier in intermediary element 12 can realize by the hole 43 as Fig. 8.In order to simplify installation, in clamping head 3, can adopt intermediary element 12 as the groove 37 of opening above the doing of Fig. 9 as the opening in the above of Fig. 1.So longitudinal carrier 1 can be from top insertion intermediary element 12.Can not need aforesaid intermediary element 12 is come on the longitudinal carrier 1.Intermediary element can be done lateral groove 5 equally just like Fig. 4.The installation of intermediary element 12 is preferably carried out from the side of collet 7.Eaves 39 on intermediary element 12 prevents that intermediary element 12 from upwards skidding off from clamping head.It skids off downwards then and prevents by clamping element 7.
Claims (51)
1. be used in the vertebrae fixed system, connecting the device of longitudinal carrier (1) and pedicle screw (2), it has a clamping head (3), described clamping head has a central axis (4) and a groove that is used to admit longitudinal carrier (1) (5) that moves towards perpendicular to central axis (4), what also have a upward opening is used for clamping tool (10,17) admittance dimple (33) and is to the hollow cave (6) with central axis (4) that the taper of under shed is dwindled downwards, coaxial line is laid a collet (7) with central axis (4) slidably in the cave, this chuck is made the head (9) that is used for flexibly admitting pedicle screw (2), at this moment, hollow cave (6) upwards enters in the admittance dimple (33) of clamping tool (10) vertically
It is characterized by,
A) collet (7) is made hollow truncated cone shape and is provided with at least four otch (8) of trend vertically, and wherein, a part is led to the basal plane (34) of hollow truncated cone shape collet (7), and a part is led to its coverage rate (35), and
B) collet (7) can radially be compressed to pressing down also directly or indirectly vertically by clamping tool (10,17).
2. device as claimed in claim 1 is characterized by, and otch (8) alternately leads to the basal plane (34) and the coverage rate (35) of hollow truncated cone shape collet (7).
3. as the device of claim 1 or 2, it is characterized by, done at least 6 otch (8) on the collet (7).
4. as the device of claim 1 or 2, it is characterized by, collet (7) is with respect to central axis (4) rotation symmetry.
5. as the device of claim 1 or 2, it is characterized by, hollow truncated cone shape collet (7) has one 3 °～8 ° semi-cone angle α/2.
6. as the device of claim 1 or 2, it is characterized by, there are one 3 °～8 ° semi-cone angle α/2 in the hollow cave of truncated cone shape (6).
7. as the device of claim 1 or 2, it is characterized by, hollow truncated cone shape collet (7) can compress about 0.8～1.2mm along diameter.
8. as the device of claim 1 or 2, it is characterized by, hollow truncated cone shape collet (7) can extend about 0.3～0.6mm along diameter.
9. as the device of claim 1 or 2, it is characterized by, hollow truncated cone shape collet (7) is done concavity in inside.
10. device as claimed in claim 9 is characterized by, and hollow truncated cone shape collet (7) is made hollow ball layer shape in inside.
11. device as claimed in claim 9 is characterized by, hollow truncated cone shape collet (7) is made toroid in inside.
12. the device as claim 1 or 2 is characterized by, hollow truncated cone shape collet (7) is made hollow cylinder in inside.
13. device as claim 1 or 2, it is characterized by, collet (7) has a conical surface (27) that enlarges downwards on its hypomere, so that the nail bar (26) of pedicle screw (2) can be locked with respect to central axis (4) with one-25 °～+ 25 ° angle [alpha].
14. the device as claim 1 or 2 is characterized by, collet (7) longitudinally axis (4) is unlimited fully.
15. device as claimed in claim 1 is characterized by, it comprises that in addition one has the pedicle screw (2) of spherical head (9).
16. the device as claim 15 is characterized by, the head (9) of pedicle screw (2) is done the structure that it is shaped as traverse furrow or cross rib (28).
17. the device as claim 15 is characterized by, the head (9) of pedicle screw (2) has been done hexagon limit (16) in.
18. device as claimed in claim 1 is characterized by, its structure that is shaped as traverse furrow or cross rib (29) is done in hollow truncated cone shape collet (7) inside.
19. one device as claim 15 to 18 is characterized by, pedicle screw is by harder material manufacture, and it is harder than the surface, inside of hollow truncated cone shape collet (7).
20. one device as claim 15 to 18 is characterized by, the spherical head (9) of pedicle screw (2) and the diameter of the corresponding dimple in the collet (7) be 6 and 10mm between.
21. one device as claim 15 to 18 is characterized by, the distance between the longitudinal axis (32) of spherical head (9) and longitudinal carrier (1) 4 and 10mm between.
22. the device as claim 1 or 2 is characterized by, it comprises a clamping tool (10,17), uses it, and longitudinal carrier (1) releasably is fixed in the clamping head (3) directly or indirectly vertically and circumferentially.
23. device as claim 1 or 2, it is characterized by, central axis (4) is by groove (5) guiding, the extension (11) in hollow cave (6) is arrival slot (5) so far, so that clamping tool (10) can and radially compress it by the downward vertically pressing spring chuck (7) of the longitudinal carrier (1) in the insertion groove (5).
24. the device as claim 1 or 2 is characterized by, and in the top of collet (7) a hollow cylinder intermediary element (12) is set in hollow cave (6), longitudinal carrier (1) can act on thereon, so as with collet (7) vertically to pressing down.
25. device as claim 1 or 2, it is characterized by, in the top of collet (7) a complementary polygonal intermediary element (12) is set in polygon hollow cave (6), longitudinal carrier (1) can act on thereon, so as with collet (7) vertically to pressing down.
26. the device as claim 1 or 2 is characterized by, groove (5) so is open upwards, and forms clamping head (3) so that press yoke shape.
27. device as claim 1 or 2, it is characterized by, clamping head (3) have one with groove (5) threaded through hole that be communicated with, upward opening (13), so be screwed into clamping tool (10) at Kong Zhongke, so that the longitudinal carrier (1) in the insertion groove (5) can be fixed vertically and circumferentially.
28. the device as claim 1 or 2 is characterized by, groove (5) opens wide to the side, so that can admit longitudinal carrier (1) from the side.
29. device as claim 1 or 2, it is characterized by, groove (5) opens wide to the side, so that can admit longitudinal carrier from the side, simultaneously, clamping head (3) section (14) thereon has external screw thread (15), and a hollow cylindrical sleeve (16) and the nut (17) corresponding with external screw thread (15) with dimple (18) is set in addition, thus, the available sleeve of longitudinal carrier (1) (16) in the insertion groove (5) is fixed vertically and circumferentially.
30. device as claimed in claim 1 is characterized by, central axis (4) is positioned at the outside of groove (5).
31. device as claimed in claim 1 is characterized by, clamping tool (10) directly is pressed on the collet (7).
32. device as claimed in claim 1 is characterized by, clamping tool (10) is pressed on the collet (7) indirectly by an intermediary element (12).
33. one device as claim 30 to 32 is characterized by, groove (5) seals.
34. one device as claim 30 to 32 is characterized by, groove (5) opens wide.
35. one device as claim 30 to 32 is characterized by, the clamping element that is used for longitudinal carrier (1) is an adjustment screw (31).
36. one device as claim 30 to 32 is characterized by, the distance between the longitudinal axis (32) of central axis (4) and longitudinal carrier (1) is at least half of diameter sum of longitudinal carrier (1) and hollow cave (6).
37. device as claimed in claim 1, it is characterized by, clamping element is pressed on the collet (7) by intermediary element (12), the clamping tool (10) that is used for longitudinal carrier (1) then so is integrally formed in pinching screw (36), so that longitudinal carrier (1) and spherical head (9) can separately be fixed.
38. device as claimed in claim 1, it is characterized by, clamping element is pressed on the collet (7) by intermediary element (12), and the clamping tool (10) that is used for longitudinal carrier (1) then is integrally formed in intermediary element (12), and thus can be separately fixedly longitudinal carrier (1) and spherical head (9).
39. one device as claim 37 to 38 is characterized by, clamping element is a pinching screw (36).
40. one device as claim 37 to 38 is characterized by, the clamping element that is used for collet (7) is a binding nut (38).
41. device as claimed in claim 3 is characterized by, and has done at least 8 otch (8) on the collet (7).
42. device as claimed in claim 5 is characterized by, hollow truncated cone shape collet (7) has one 5 °～7 ° semi-cone angle α/2.
43. device as claimed in claim 6 is characterized by, there are one 5 °～7 ° semi-cone angle α/2 in the hollow cave of truncated cone shape (6).
44. device as claimed in claim 7 is characterized by, hollow truncated cone shape collet (7) can compress about 0.9～1.1mm along diameter.
45. device as claimed in claim 8 is characterized by, hollow truncated cone shape collet (7) can extend about 0.35～0.45mm along diameter.
46. the device as claim 19 is characterized by, pedicle screw is made by the Ti-Al-Nb alloy, and hollow truncated cone shape collet (7) is with pure titanium manufacturing.
47. the device as claim 20 is characterized by, the spherical head (9) of pedicle screw (2) and the diameter of the corresponding dimple in the collet (7) be 7.5 and 8.5mm between.
48. the device as claim 21 is characterized by, the distance between the longitudinal axis (32) of spherical head (9) and longitudinal carrier (1) 6 and 8mm between.
49. the device as claim 22 is characterized by, it comprises a clamping tool (10,17), uses it, and longitudinal carrier (1) directly or through a sleeve (16) releasably is fixed in the clamping head (3) vertically and circumferentially.
50. the device as claim 25 is characterized by, described intermediary element (12) has through hole.
51. the device as claim 32 is characterized by, described intermediary element (12) is a hollow cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB961805366A CN1142746C (en) | 1996-12-12 | 1996-12-12 | Device for connecting longitudinal support to pedicle screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB961805366A CN1142746C (en) | 1996-12-12 | 1996-12-12 | Device for connecting longitudinal support to pedicle screw |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1239414A CN1239414A (en) | 1999-12-22 |
| CN1142746C true CN1142746C (en) | 2004-03-24 |
Family
ID=5127968
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB961805366A Expired - Lifetime CN1142746C (en) | 1996-12-12 | 1996-12-12 | Device for connecting longitudinal support to pedicle screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1142746C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1965770B (en) * | 2005-11-17 | 2010-09-01 | 比德曼莫泰赫有限公司 | Bone anchoring device |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6945975B2 (en) * | 2003-07-07 | 2005-09-20 | Aesculap, Inc. | Bone fixation assembly and method of securement |
| CN1907240B (en) * | 2005-08-03 | 2011-03-16 | 比德曼莫泰赫有限公司 | Bone anchoring device |
| EP1774919B1 (en) * | 2005-10-12 | 2008-08-20 | BIEDERMANN MOTECH GmbH | Poly-axial screw pivotable in a single plane |
| CN101199432B (en) * | 2006-12-14 | 2010-09-22 | 叶安时 | Spine fixed installation for flexible cable |
| ES2609079T3 (en) * | 2009-08-12 | 2017-04-18 | Biedermann Technologies Gmbh & Co. Kg | Housing piece to accommodate a rod in order to couple the rod to a bone anchoring element |
| EP2502594B1 (en) * | 2011-03-22 | 2014-12-03 | Medacta International S.A. | Polyaxial pedicle screw and fixation system kit comprising said screw |
| FR3034979B1 (en) * | 2015-04-17 | 2021-08-27 | Implanet | DEVICE, SYSTEM AND METHOD FOR FIXING A SPINAL VERTEBRA ON A ROD. |
-
1996
- 1996-12-12 CN CNB961805366A patent/CN1142746C/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1965770B (en) * | 2005-11-17 | 2010-09-01 | 比德曼莫泰赫有限公司 | Bone anchoring device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1239414A (en) | 1999-12-22 |
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Owner name: SYNTHES LTD. Free format text: FORMER OWNER: SYNTHES AG CHUR Effective date: 20061201 |
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