WO1994008527A1 - Verankerungselement - Google Patents
Verankerungselement Download PDFInfo
- Publication number
- WO1994008527A1 WO1994008527A1 PCT/EP1993/002756 EP9302756W WO9408527A1 WO 1994008527 A1 WO1994008527 A1 WO 1994008527A1 EP 9302756 W EP9302756 W EP 9302756W WO 9408527 A1 WO9408527 A1 WO 9408527A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rod
- section
- thread
- anchoring element
- shaft
- Prior art date
Links
Classifications
-
- 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
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass
-
- 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
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7002—Longitudinal elements, e.g. rods
- A61B17/7011—Longitudinal element being non-straight, e.g. curved, angled or branched
-
- 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
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
Definitions
- the invention relates to an anchoring element with a shaft intended for bone anchoring and a head which can be connected to a rod and which has a substantially U-shaped cross section, which is connected at its base to the shaft and has two free legs which form a channel for receiving the rod the legs have an internal thread and an external thread, and with an element comprising the outside of the element, having an internal thread interacting with the external thread and a fixing element having a thread interacting with the internal thread of the leg.
- Such anchoring element is known from EP-A-048783.
- the rod has a triangular cross-section and serves to brace against torsional movement.
- plates are provided which are bent according to the shape correction to be carried out. The plates naturally take up a relatively large amount of space.
- the base between the two legs is flat in the longitudinal direction of the slot.
- there is a considerable permanent vibration load due to the forces exerted on the rod. As a result, the rods tend to tear in the area of the edges of the slot base after a certain time.
- the object of the invention is to form the anchoring element so that the dimensioning of the anchoring can be reduced and the anchoring withstands a higher permanent load. This plays a role in particular, knows such anchoring elements with the rods to be connected as part of corrective implants for di human spine are used and therefore small dimensions and unlimited resilience should be aimed for.
- the base of the U-shaped recess has an arched section in its direction perpendicular to the U-shaped cross section. It is thereby achieved that instead of the plate elements for the actual shape correction, round rods can be used which are bent according to the shape correction, since it is also possible to fix curved rods perfectly in the anchoring elements. In addition, even with straight bars, but especially with curved bars, the durability is increased significantly under permanent load.
- Figure 1 is a side view of a first embodiment of the anchoring element.
- FIG. 2 shows a front view of the device shown in FIG. 1;
- FIG. 3 shows a section along the line III - III in Fig. I.
- Fig. 5 is a side view of a second embodiment
- FIG. 6 shows a section along the plane of symmetry of a modified embodiment in an exploded view
- 8 shows the representation according to FIG. 7 with a fixed straight rod
- Fig. 10 the same embodiment with a concave curved rod.
- the anchoring element shown in FIG. 1 comprises a screw 1, which is actually to be inserted into a spine, with a threaded shaft 2 and a head 3.
- the head 3 has a U-shaped recess 4, which is arranged symmetrically to the central axis of the threaded shaft 2, the base of which 5 is directed towards the threaded shaft 2.
- the side wall of the head delimiting the U-shaped recess 4 is formed by free legs 6, 7.
- a bore with an internal thread 8 is provided in the interior of the channel which is concentric with the central axis of the threaded shaft 2.
- the head 3 itself is cylindrical and, as can best be seen from FIG. 4, has an external thread 9 in the region of the free legs 6, 7.
- a fixing element 11 designed as a threaded bolt is provided.
- the fixing element 11 has an external thread cooperating with the internal thread 8 for screwing into the U-shaped recess 4.
- the fixing element On its surface facing away from the base 5, the fixing element has a slot or a correspondingly different recess for engagement by means of a screwdriver.
- an element which surrounds the two U-shaped legs 6, 7 from the outside is provided in the form of a union nut 12, the thread of which cooperates with the external thread 9.
- the direction of rotation of the internal thread 8 and the associated fixing element 11 on the one hand and of the external thread 9 and the union nut 12 on the other hand is directed in the opposite direction. As can best be seen from FIG.
- the base 5 of the U-shaped recess has a radius which is only so much larger than the radius of the Increasing rod 10 is that the rod can be easily inserted into or removed from the U-shaped recess.
- the internal thread 8 and the external thread 9 each extend so far downwards, that is to say in the direction of the base 5, that the projection on the axis of symmetry is at a distance from the base 5 which is smaller than the diameter of the rod 10 to be received.
- the head is not connected to a threaded shaft, but to a shaft designed as a hook 16. This serves in the same way for connection to a spinal column element, the hook being introduced into the vertebral arch.
- the base of the U-shaped recess has a recess 17 in the form of a counterbore, which is concentric with the central axis of the inner thread 8.
- the two outer edges 18, 19 of the bottom are curved to the outside towards the shaft. It is thereby achieved that when picking up a curved rod not only a punctiform support on the base of the U-shaped recess 4, but also a larger contact surface is formed.
- the curvature towards the shaft serves to ensure a better positive fit in the case of a rod which is bent towards the shaft.
- FIG. 7 to 10 each show the head of a further embodiment with a rod to be connected to it.
- the shaft connected to the head can be designed both as a threaded shaft 2 and as a hook 16.
- the base of the respective U-shaped recess is curved.
- the curvature has an inner concave section 20 and two upwardly projecting curved areas 21, 22 arranged symmetrically to the central axis of the screw.
- the distance of the highest point of the bead-shaped elevation 21 or 22 from the central axis of the screw is essentially equal to the distance the middle 23 between the radius of the internal thread 8 and the radius of the external thread 9 from the axis of symmetry of the screw.
- the head 3 has two recesses 13, 14 which are mutually offset by 180 °, which are essentially each offset by 90 ° against the U-shaped recess and the serve for engagement by means of a handling tool, for example gripping pliers.
- screw 1 is first screwed into the spine. Then the rod 10 or 15, 15 'is inserted into the U-shaped recess 4 and fixed by screwing the fixing element 11 into the thread 8. Then the union nut 12 is screwed on. The fixing element and the union nut 12 are now each separately rotated in the direction of the base 5 until each of the two parts exerts a desired holding force on the rod 10, 15, 15 '.
- This has the advantage that the fixing of the fixing element 11 and the union nut 12 can be adjusted independently of one another relative to the rod. In addition, there is a final fixation and screw locking by jamming.
- each rod to be fixed Regardless of whether it is designed as a straight rod 10 or as a convex or concave curved rod 15, 15 ', it rests on two planar areas 21, 22.
- the lower edges 24, 25 of the fixing element 11 and the union nut 12 facing the rod are additionally rounded or convexly curved. It is thereby achieved that all points of attack which act on the rod to be gripped during the fixing act on the rod without sharp edges.
- the position described ensures that the areas of attack of the two raised areas 21, 22 of the ground are precisely between the two areas of attack of the fixing element 11 and the union nut 12. A particularly good fixation and a particularly low stress load are thereby achieved. As can best be seen from FIGS. 8 to 10, the good fixation is achieved for each type of bending of the rods 10, 15, 15 '.
- the head 3 is in each case firmly connected to the threaded shaft or the hook-shaped shaft. According to a modified embodiment, the respective shaft and the head are connected to one another in an articulated manner.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/244,397 US5545165A (en) | 1992-10-09 | 1992-10-08 | Anchoring member |
EP93922921A EP0616512B1 (de) | 1992-10-09 | 1993-10-08 | Verankerungselement |
JP6509589A JP2622901B2 (ja) | 1992-10-09 | 1993-10-08 | 固定部材 |
DE59307208T DE59307208D1 (de) | 1992-10-09 | 1993-10-08 | Verankerungselement |
KR1019940701945A KR0148838B1 (ko) | 1992-10-09 | 1993-10-08 | 고정 부재 |
US08/625,405 US5725527A (en) | 1992-09-10 | 1996-03-27 | Anchoring member |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP4234118.3 | 1992-10-09 | ||
DE4234118A DE4234118C2 (de) | 1992-10-09 | 1992-10-09 | Verankerungselement |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994008527A1 true WO1994008527A1 (de) | 1994-04-28 |
Family
ID=6470108
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1993/002756 WO1994008527A1 (de) | 1992-09-10 | 1993-10-08 | Verankerungselement |
Country Status (9)
Country | Link |
---|---|
US (2) | US5545165A (de) |
EP (2) | EP0616512B1 (de) |
JP (1) | JP2622901B2 (de) |
KR (1) | KR0148838B1 (de) |
AT (1) | ATE157233T1 (de) |
CA (1) | CA2124840C (de) |
DE (2) | DE4245026B4 (de) |
ES (1) | ES2108881T3 (de) |
WO (1) | WO1994008527A1 (de) |
Cited By (4)
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FR2747910A1 (fr) | 1996-04-30 | 1997-10-31 | Harms Jurgen | Element d'ancrage destine a l'ancrage dans un os |
US7766946B2 (en) | 2005-07-27 | 2010-08-03 | Frank Emile Bailly | Device for securing spinal rods |
US8636783B2 (en) | 2006-12-29 | 2014-01-28 | Zimmer Spine, Inc. | Spinal stabilization systems and methods |
US10575876B2 (en) | 2016-04-20 | 2020-03-03 | K2M, Inc. | Spinal stabilization assemblies with bone hooks |
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FR2747910A1 (fr) | 1996-04-30 | 1997-10-31 | Harms Jurgen | Element d'ancrage destine a l'ancrage dans un os |
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Also Published As
Publication number | Publication date |
---|---|
DE59307208D1 (de) | 1997-10-02 |
JP2622901B2 (ja) | 1997-06-25 |
EP0616512A1 (de) | 1994-09-28 |
JPH06511415A (ja) | 1994-12-22 |
ES2108881T3 (es) | 1998-01-01 |
EP0776635A1 (de) | 1997-06-04 |
CA2124840C (en) | 1998-08-25 |
CA2124840A1 (en) | 1994-04-28 |
EP0616512B1 (de) | 1997-08-27 |
US5725527A (en) | 1998-03-10 |
DE4245026B4 (de) | 2007-03-08 |
ATE157233T1 (de) | 1997-09-15 |
US5545165A (en) | 1996-08-13 |
KR0148838B1 (ko) | 1998-10-01 |
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