Patent US5696989A successfully refreshed from Google Patents.
Patent EP1121902B1 successfully refreshed from Google Patents.
EP1121902B1
Expired / Lapsed
EP
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Pedicle screw
Assignee: Ulrich GmbH and Co KG
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Filing: 2001-01-17
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Granted: 2004-09-22
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Expires: 2021-01-17
Abstract
Abstract A pedicle-screw assembly has a screw extending along an axis and having a threaded shaft and a round head, an inner cap part carried on the head and swivelable on the head, and an outer cap part forming with the inner cap part a seat adapted to hold an end of a distraction/stabilizing rod. The outer cap part has formations engageable in a snap fit over the inner cap part, and an element on the outer cap part can be tightened to fix the rod in the seat. The outer cap part is generally U-shaped and formed with a base forming the seat and a pair of legs projecting parallel to the axis, flanking the cap inner part, and having ends engaged in a snap fit around sides of the cap inner part.
Inventors
- 👤 Martin Schäffler-Wachter
- 👤 Helmut SCHÖNHÖFFER
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 20:02
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/70; A61B17/7001; A61B17/7035; A61B17/7037; A61B17/7032; A61B17/7038
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
136 words
A pedicle screw for implants for correction and stabilisation of the
spinal column, comprising a head portion (5) which is arranged at the axial
end of a screwthreaded shank (3) and a stirrup portion (7) which can be
connected to the head portion and which is of a U-shaped configuration
with a base plate (8) and two side limbs (9) and has a receiving means for
a rod (2) which can be fixed to the head portion (5), wherein the head
portion (5) has a round part (4) characterised in that the head portion (5)
further has a polyaxially rotatable cap (6) which is mounted rotatably on
the round part (4) and that the stirrup portion (7) can be fixed in a
retaining fit on the cap (6) by a plug-in movement in the axial direction.
Claim 2
Dependent Claim
46 words
A pedicle screw according to claim 1 characterised in that the
round part (4) is in the form of a hemispherical portion (20) with a flat
surface (22) which is oriented in perpendicular relationship to the
screwthreaded shank (3) and which faces towards the free end.
Claim 3
Dependent Claim
30 words
A pedicle screw according to claim 2 characterised in that arranged on the flat surface (22) is a part-spherical portion (23) of a
smaller diameter than the hemispherical portion (20).
Claim 4
Dependent Claim
46 words
A pedicle screw according to one of claims 1 to 3 characterised in
that provided at the free ends of the side limbs (9) are retaining noses (10)
which come into hooking engagement on the cap (6) to provide the
retaining fit in the plug-in movement.
Claim 5
Dependent Claim
31 words
A pedicle screw according to one of claims 1 to 4 characterised in
that there are provided means for blocking the rotatability of the cap (6) on
the round part (4).
Claim 6
Dependent Claim
57 words
A pedicle screw according to claim 5 characterised in that the
mutually facing surfaces of the round part (4) and the cap (6) have a
surface profiling and that provided in the base plate (8) of the stirrup
portion (7) is a screwthreaded bore (18) for a securing screw (19) which
serves to fix the rod (2).
Claim 7
Dependent Claim
51 words
A pedicle screw according to one of claims 1 to 6 characterised in
that arranged on the cap (6) are end plates (11) each having a respective
guide leg (12) extending in the axial direction and that each side limb (9)
has a guide groove (13) for the guide leg (12).
Claim 8
Dependent Claim
34 words
A pedicle screw according to claim 7 characterised in that the
guide legs (12) and the guide grooves (13) on the end plates (11) and the
side limbs (9) are interchanged with each other.
Claim 9
Dependent Claim
28 words
A pedicle screw according to one of claims 4 to 8 characterised in
that the retaining noses (10) engage behind the free edges of the end
plates (11).
Claim 10
Dependent Claim
28 words
A pedicle screw according to one of claims 1 to 9 characterised in
that the cap (6) has a channel (14) as a support for the rod (2).
Claim 11
Dependent Claim
19 words
A pedicle screw according to claim 10 characterised in that an
opening (15) is provided in the channel (14).
Claim 12
Dependent Claim
29 words
A pedicle screw according to one of claims 4 to 11 characterised
in that a channel (16) is provided in the base plate (8) of the stirrup portion
(7).
Claim 13
Dependent Claim
29 words
A pedicle screw according to one of claims 2 to 12 characterised
in that a groove (17) is provided between the base plate (8) and the side
limbs (9).
Claim 14
Dependent Claim
29 words
A pedicle screw according to one of claims 1 to 13 characterised
in that the head portion (5) is attached to a constriction (21) of the
screwthreaded shank (3).
References Cited (Backward Citations)
No citation records indexed.
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