EP0885598B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Pedicle screw with a receiving part for a retaining component of a vertebral column implant
Assignee: Stryker Trauma GmbH
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Filing: 1998-05-20
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Granted: 2005-04-27
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Expires: 2018-05-20
Abstract
Abstract A receiving part for a retaining component of a vertebral column implant, including a fork-shaped section for receiving the raining component, the inner wall of the fork-shaped section is formed with inner threaded portions into which a screw may be threaded to act on the retaining component in the fork-shaped section via a pressing element or directly, characterized in the retaining component is the shank of a pedicle whose broadened end near to the head is accommodated in the fork-shaped section and the fork-shaped head laterally comprises a slot which is dimensioned such that the broadened end of the shank may be laterally introduced into the receiving space of the head. <IMAGE>
Inventors
- 👤 Peter Dr. Metz-Stavenhagen
- 👤 Bernd Robioneck
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 17:56
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/70; A61B17/7001; A61B17/7035; A61B17/7037; A61B17/7032; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/44; A61B17/7049
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
182 words
A pedicle screw (50) comprising a shank and a head (54), wherein
said head (54) comprises a fork-shaped receiving part (10) for a
retaining component and an opening (64) in said
receiving part opposite the fork through which the shank (52) extends, wherein
said shank (52) comprises at the end near the head a broadened
section (56) which on the side pointing towards the shank (52)
comprises an annular spherical bearing surface (58), wherein the
walling of said opening (64) comprises an bearing surface (66)
which cooperates with the spherical bearing surface (58) of the
shank (52), characterized in that said receiving part (10) of
the head (54) is provided with an inner threaded section of the
head (54), wherein said threaded section comprises a saw tooth
thread into which a screw may be threaded to act on the retaining
component in the receiving part via a pressing element or
directly, wherein the saw tooth thread is of a shape that the
steep flanks (20) of the inner threaded sections (16, 18) face
away from the opening of the fork-shaped section (10).
Claim 2
Dependent Claim
20 words
The pedicle screw according to claim 1, characterized in that the bearing surface
(66) of said opening (64) is spherical.
Claim 3
Dependent Claim
29 words
The pedicle screw according to one of the claims 1 or 2, characterized in that the
retaining component is a rod-like element (22, 42, 76), preferably a distraction rod.
Claim 4
Dependent Claim
39 words
The pedicle screw according to one of the claims 1 to 3, characterized in that the
end surface (60) of the shank is convex and a disk (68) is located between the
screw (72) and the end surface (60).
Claim 5
Dependent Claim
21 words
The pedicle screw according to claim 4, characterized in that the disk is
approximately fittingly accommodated by the fork-shaped head (54).
Claim 6
Dependent Claim
24 words
The pedicle screw according to claim 4 or 5, characterized in that the side of the
disk facing the screw (72) is formed plane.
Claim 7
Dependent Claim
26 words
The pedicle screw according to claim 4 or 5, characterized in that the end surface
of the side of the disk facing the screw is concave.
Claim 8
Dependent Claim
49 words
The pedicle screw according to claim 7, characterized in that the concave surface
of the disk and the opening (92) are dimensioned such that a rod accommodated
by the receiving part (54b) bears against the spherical surface of the end, of the
pedicle screw, which is near the head.
Claim 9
Dependent Claim
34 words
The pedicle screw according to one of the claims 4 to 8, characterized in that the
disk (68b) comprises several radial slots (90) distanced in the circumferential
direction which are formed in the periphery.
Claim 10
Dependent Claim
23 words
The pedicle screw according to one of the claims 4 to 9, characterized in that the
disk (68b) comprises a central opening (92).
Claim 11
Dependent Claim
63 words
The pedicle screw according to one of the claims 4 to 10, characterized in that the
disk (68) comprises an outer thread and the head (54) comprises inner threaded
sections with which the outer thread of the disk (68) engages, wherein the thread
near to head-side end of the shank comprises a free rotation in which the disk (68)
can be loosely accommodated.
Claim 12
Dependent Claim
48 words
The pedicle screw according to one of the claims 1 to 11, characterized in that the
fork-shaped head (54a) laterally comprises a slot (78) which is dimensioned such
that the broadened end (56) of the shank may be laterally introduced into the
receiving space of the head (54).
Claim 13
Dependent Claim
38 words
The pedicle screw according to one of the claims 1 to 12, characterized in that on
the outer side of the arms of the fork-shaped head (54a) diametrical recesses (80,
82) are formed for receiving a fork-shaped tool.
Claim 14
Dependent Claim
125 words
The pedicle screw according to one of the claims 1 to 13, characterized in that the
shank (100) of the pedicle screw at the upper end comprises a spherical section
(102), an annular cage (106) is provided which comprises several slots (122)
parallel to the axis which are distanced in the circumferential direction and which
are formed proceeding from the lower end, and which on the inside comprises a
spherical bearing surface (124) and the cage (106) on the outer side comprises a
conical surface (120) which cooperates with a conical inner surface (114) of the
receiving part (108) in a manner such that on pressing the cage (106) into the
receiving part in the direction of the shank (100) the cage is pressed radially.
Claim 15
Dependent Claim
21 words
The pedicle screw according to claim 14, characterized in that the cage (106) is
parted by a radial continuous slot (122).
References Cited (Backward Citations)
No citation records indexed.
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