EP1667593A1 - Dynamic damping element for two bones - Google Patents

Dynamic damping element for two bones

Info

Publication number
EP1667593A1
EP1667593A1 EP20030818771 EP03818771A EP1667593A1 EP 1667593 A1 EP1667593 A1 EP 1667593A1 EP 20030818771 EP20030818771 EP 20030818771 EP 03818771 A EP03818771 A EP 03818771A EP 1667593 A1 EP1667593 A1 EP 1667593A1
Authority
EP
European Patent Office
Prior art keywords
damping element
end
characterized
according
element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20030818771
Other languages
German (de)
French (fr)
Inventor
Stephan Hartmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Synthes GmbH
Original Assignee
Synthes GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Synthes GmbH filed Critical Synthes GmbH
Priority to PCT/CH2003/000649 priority Critical patent/WO2005030068A1/en
Publication of EP1667593A1 publication Critical patent/EP1667593A1/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical 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
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002Longitudinal elements, e.g. rods
    • A61B17/7019Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other
    • A61B17/7025Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other with a sliding joint
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical 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
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002Longitudinal elements, e.g. rods
    • A61B17/7019Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other
    • A61B17/7031Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other made wholly or partly of flexible material
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical 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
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002Longitudinal elements, e.g. rods
    • A61B17/7004Longitudinal elements, e.g. rods with a cross-section which varies along its length
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00Joints and connections
    • Y10T403/45Flexibly connected rigid members
    • Y10T403/455Elastomer interposed between radially spaced members

Abstract

The invention relates to a damping element (1) which dynamically stabilises two bones, in particular two adjacent vertebral bodies comprising: A) a flexible element (20) which is externally coaxial with a longitudinal axis (3) and provided with a first (9) and second (10) ends cutting the longitudinal axis (3) and a coaxial hollow volume (13) which is open towards the first end (9) and closed towards the second end (10) by a frontal wall (14) perpendicular to the longitudinal axis; B) a coaxial connecting element (4, 5) is arranged on each of two ends (9, 10) for fixing the damping element (1) inside an osteosynthetic stabilisation device to both sides thereof, wherein C) an internal flexible element (15) which coaxially penetrates at least partly into said hollow volume (13) is provided and whose front end (17) is oriented towards the second end (10) of the external flexible element (20), and D) a distance X≥0 is axially provided between the front end (17) of a flexible internal element (15) and the frontal wall (14) of the hollow volume (13).

Description

DAMPING ELEMENT FOR DYNAMIC OF TWO BONE

The invention relates to a damping element according to the preamble of claim 1.

From FR 2812186 PASQUET a generic damping element is already known, which can be used within a spinal fixation device, for example as a connecting element between two adjacent pedicle screws. This known damping element comprises two substantially axial outsiders longitudinal connecting elements and an interposed member which is made of a material of higher elastic deformability than the outer standing interconnection elements. A disadvantage of this known damping element, that the spring rate is determined by the geometry and the choice of material of the central elastic member.

The invention aims to provide a remedy. The invention has for its object to provide a damping element with a progressive spring rate, the course of which is selectable.

The invention achieves this object with a damping element, which has the features of claim 1.

Further advantageous embodiments of the invention are characterized in the dependent claims.

The advantages achieved by the invention are to be seen essentially in that, thanks to the inventive damping element

- a progressive spring rate is adjustable, which ensures a sufficiently large elastic resilience at low spring travel. Thereby, a sufficient freedom of movement of the spine in this area allows; - with an adjustable travel, a stronger resistance begins, so that overloading of the posterior elements can be prevented; and

- no overloads occur on the vertebrae or the lying in the intervertebral disc space even at shock loads.

The dimension X is preferably between 0 mm and 2 mm. Thus, the spring travel of the spring element is adjustable with the spring rate. Once the spring member is axially compressed by the dimension X, the front end of the inserted into the cavity of the spring element the clamping sleeve on the front wall of the cavity comes into abutment, so that the end wall is deformed in the cavity of Federelernentes at a further axial compression of the spring element and thus a higher spring rate f 2 prevails.

Preferably, the field element of an elastomer is produced, while the clamping sleeve is preferably made of a metallic material, in particular of titanium.

In another embodiment, the front end of the clamping sleeve is formed convex. This spring rate f 2 is influenced by the shape of the convex end face at the front end of the clamping sleeve, so that a stronger Progessivität the spring rate f 2, for example by a flat-shaped convex end face accessible than sharply curved in a groove formed convex face would be the case.

In yet another embodiment, the connecting parts are rotationally and axially positively connected to the spring element. the connection parts are provided at their thereto directed against the spring element end faces with barbs preferably, which could be molded into the ends of the Federelernentes.

In another embodiment, a connecting part comprises a coaxial standing outside the longitudinal axis of rod, whereby the damping member is connectable for example with a bone anchoring element. In still another embodiment of the second connecting part is designed as a sleeve with a coaxial central bore to the longitudinal axis, wherein the clamping sleeve is at least partially carried out through the central bore. The blocking of a rod-shaped longitudinal member in the clamping sleeve is preferably effected by wedging one into the central bore of the bushing (21) arranged inside cone with a complementary outer cone of the clamping sleeve. For receiving a rod-shaped longitudinal member of a stabilizing osteosynthetic device, the clamping sleeve in a coaxial, open at the rear end blind hole.

In another embodiment, the radial elastic deformability of the clamping sleeve is achieved by at least one wall of the clamping sleeve radially penetrating slit. The compression of the clamping sleeve is preferably effected by a sleeve arranged on the thread, over which a nut is preferably formed as a blocking means can be screwed.

The invention and further developments of the invention are explained below with reference to the partially schematic illustrations of several embodiments thereof in more detail.

Show it:

Fig. Leash exploded view of an embodiment of the inventive damping element; and

Fig. 2 shows a longitudinal section through the embodiment illustrated in Fig. 1 embodiment of the inventive damping element in the mounted state.

In Figs. 1 and 2, an embodiment is shown which includes a damping element 1 having a longitudinal axis 3, an axially outwardly projecting, longitudinal connecting member 4, an axially opposite outsiders, hollow-body connection portion 5 and an intermediate coaxial resilient central part 2.

The hollow-body-shaped connecting part 5 is formed as a hollow cylindrical bushing 21 and has an outer diameter corresponding to that of the resilient central portion. 2 The longitudinal link member 4 axially outer standing comprises a circular cylindrical rod 12 and to the resilient central part 2 adjacent a flange 11 whose outer diameter approximately that of the elastic central portion 2 corresponds. The hollow-body-shaped connecting member 5 has elastic means against the part 2 directed to a first, orthogonal to the longitudinal axis 3 end face. 7 Similarly, 11, the flange on the longitudinal link member 4 directed against the resilient central part 2 to a second, orthogonal to the longitudinal axis 3 end face. 6

Directed against the resilient central part 2 faces 6; 7 at the connecting portions 4, 5 are provided with the longitudinal axis 3 concentric, annular and arranged peripherally barbs. 8 The barbs 8, in the manufacture of the longitudinal beam 1 in the axially outwardly projecting ends 9; 10 of the elastic middle section 2 is poured, so that an axial and rotative form fit between the elastic middle part 2 and the axially outwardly projecting connecting parts 4, 5 is produced.

The resilient central part 2 is here circular cylindrical and includes a coaxial to the longitudinal axis 3 of the spring element 20 with a likewise coaxial cavity 13 and a coaxially in the cavity 13 arranged clamping sleeve 15. The cavity 13 is axially open to the hollow-body-shaped connecting part 5 and against the longitudinal link member 4 is terminated by a plane orthogonal to the longitudinal axis 3 of the end wall fourteenth

The clamping sleeve 15 is axially inserted into the central bore 16 in the hollow-body-shaped connecting part 5 and into the cavity. 13 In the illustrated embodiment 15, the clamping sleeve at the front, against the end wall 14 of the cavity 13 directed end 17 has a convex end surface 18, which in non-deformed state of the elastic central part 2 axially by an amount X from the end wall 14 of the cavity 13 spaced (Fig. 2). Hereby is achieved that when an axial compressive load to the resilient central part 2, this is first deformed with the spring rate of the spring element ι 20th Once the spring member 20 is axially X compressed by the dimension, the apex of the convex end face of the clamping sleeve 18 comes to the front end of 17 15 at the end wall 14 of the cavity 13 to the system so that at a further axial compression of the elastic central portion 2, the end wall 14 is deformed in the cavity 13 of the spring member 20 and thus a higher spring rate prevails f 2. This spring rate f 2 is influenced by the shape of the convex end face 18 at the front end 17 of the collet 15, so that, for example, by a flat-shaped convex end face 18 a stronger Progessivität the spring rate f 2 is accessible than in a strongly curved shaped convex end face 18 would be the case. Is further characterized by the axially variable in the cavity 13 position of the clamping sleeve 15 relative to the spring element 20, the dimension X, and thus the transition from the spring rate f of the spring element 20 to the higher spring rate f 2 at the front end 17 adjacent the clamping sleeve 15 the spring element 20 adjustable.

The hollow cylindrical connecting part 5 is formed in two parts here and includes a bushing 21 having at its outer end 23 projecting a threaded 22nd The liner 21 is pierced with a coaxial to the longitudinal axis 3 central bore 16 with the central bore 16 extends to the outside protruding end 23 of the sleeve 21 with an inner cone 25th The diameter of the central bore 16 is sized so that the collet 15 is inserted into the central bore sixteenth The clamping sleeve 15 is provided at its rear end 24 with an outer cone 26 which is wedged in the inner cone 25 in the central bore 16 of the sleeve 21st The clamping sleeve 15 has an open end 24 at the rear, coaxial blind hole 19 into which the rear end 24 produces a rod-shaped longitudinal member (not shown) can be inserted. Further, the rear end 24 of the clamping sleeve 15 is provided, the wall of the inner spring member 15 radially penetrating slot 27 with at least one, so that the rear end 24 of the collet 15 is radially compressed during the pressing of the outer cone 26 in the inner cone 25 and a blind hole in the 19 inserted rod-shaped longitudinal member can be fixed in the clamping sleeve 15th The axial displacement of the clamping sleeve 15 relative to the spring member 20 by means of locking means 20, which are formed here as over the thread 22 on the sleeve 21 screwable nut 28th The nut 28 has a coaxial bore 29 with an internal thread 30 and an axially outwardly projecting constriction 31st When screwing the nut 28 on the thread 22 on the outer projecting end 23 of the sleeve 21, the rear end 24 of the collet 15 is at the plane formed by the constriction 31 shoulder 32, so that in a further tightening of the nut 28, the clamping sleeve 15 is compressed radially.

Claims

claims
1. Damping element (1) for dynamic stabilization of two bones, in particular two adjacent vertebral bodies comprising
A) (to a longitudinal axis 3) coaxial spring element (20) having first, the longitudinal axis (3) cutting end (9), a second, longitudinal axis (3) cutting end (10) and a coaxial cavity (13), wherein the first end (9) is open and the second end (10) is closed by a transverse end wall to the longitudinal axis (14);
B) (at each of the two ends 9; 10), a coaxial connector part (4; 5) is arranged, which are (for two-sided fixation of the damping element 1) within a suitable osteosynthetic stabilization device, characterized in that
C) a coaxially at least partially into the cavity (13) penetrating the clamping sleeve (15) is provided, which has directed, front a (against the second end 10) of the outer spring element (20) end (17), wherein
D) (between the front end 17) by an amount X is spaced apart of the clamping sleeve (15) and the end wall (14) of the cavity (13) axially> 0th
2. Damping element (1) according to claim 1, characterized in that the dimension X is between 0 mm and 2 mm.
3. Damping element (1) according to claim 1 or, characterized in that the box element (20) is made of an elastomer.
4. Damping element (1) according to one of claims 1 to 3, characterized in that the clamping sleeve (15) made of a metallic material, preferably made of titanium.
5. Damping element (1) according to one of claims 1 to 4, characterized in that the front end (17) is formed convex of the clamping sleeve (15).
6. Damping element (1) according to one of claims 1 to 5, characterized in that the connecting parts (4; 5) with the outer spring element (20) are connected rotationally and axially locking manner.
7. Damping element (1) according to claim 6, characterized in that the connecting parts (4; 5) directed against the spring element (20) end surfaces (6; 7) which are equipped with barbs (8).
8. Damping element (1) according to claim 7, characterized in that the barbs (8) in the ends (9; 10) of the spring element (20) are cast.
9. Damping element (1) according to one of claims 1 to 8, characterized in that a connecting part (4) standing outside a longitudinal axis (3) coaxial with the rod (12).
10. Damping element (1) according to one of claims 1 to 9, characterized in that the second connecting part (5) as the sleeve (21) coaxial with a longitudinal axis (3) central bore (16) is arranged, wherein the inner spring element (15 ) at least partially (through the central bore 16) is feasible.
11. Damping element (1) according to claim 10, characterized in that the central bore (16) on the outer projecting end (23) of the sleeve (21) comprises a tapered outside coaxial inner cone (25).
12. Damping element (1) according to claim 11, characterized in that the clamping sleeve (15) comprises an outer stationary, trailing end (24) having one to the inner cone (25) complementary outer cone (26).
13. Damping element (1) according to claim 12, characterized in that the clamping sleeve (15), a coaxial, at the rear end (24) open blind hole (19) for recording a bar-shaped part of an osteosynthetic stabilizing device comprises.
14. Damping element (1) according to claim 12 or 13, characterized in that the clamping sleeve (15) at the rear end (24) has at least one wall of the clamping sleeve (15) radially penetrating slot (27).
15. Damping element (1) according to one of claims 10 to 14, characterized in that the sleeve (21) comprises at its outer protruding end (23) has a thread (22).
16. Damping element (1) according to claim 15, characterized in that it comprises a locking means (20) for radial compression of the rear end (24) of the clamping sleeve (15) ..
17. Damping element (1) according to claim 16, characterized in that the blocking means (20) from a means of the thread (22) on the sleeve screw (21) nut (28) include.
EP20030818771 2003-09-29 2003-09-29 Dynamic damping element for two bones Withdrawn EP1667593A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CH2003/000649 WO2005030068A1 (en) 2003-09-29 2003-09-29 Dynamic damping element for two bones

Publications (1)

Publication Number Publication Date
EP1667593A1 true EP1667593A1 (en) 2006-06-14

Family

ID=34383941

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030818771 Withdrawn EP1667593A1 (en) 2003-09-29 2003-09-29 Dynamic damping element for two bones

Country Status (9)

Country Link
US (1) US7632293B2 (en)
EP (1) EP1667593A1 (en)
JP (1) JP2007506460A (en)
CN (1) CN1838917A (en)
AR (1) AR046534A1 (en)
AU (1) AU2003264226A1 (en)
BR (1) BR0318485A (en)
CA (1) CA2540594A1 (en)
WO (1) WO2005030068A1 (en)

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US20060264940A1 (en) 2006-11-23
US7632293B2 (en) 2009-12-15
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WO2005030068A1 (en) 2005-04-07
CA2540594A1 (en) 2005-04-07
BR0318485A (en) 2006-09-12
AU2003264226A1 (en) 2005-04-14
JP2007506460A (en) 2007-03-22

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