EP0951245B1
Expired / Lapsed
EP
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Device for connecting a longitudinal support to a pedicle screw
Assignee: Synthes GmbH
•
Filing: 1996-12-12
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Granted: 2003-03-12
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Expires: 2016-12-12
Abstract
Abstract PCT No. PCT/CH96/00437 Sec. 371 Date Jun. 11, 1999 Sec. 102(e) Date Jun. 11, 1999 PCT Filed Dec. 12, 1996 PCT Pub. No. WO98/25534 PCT Pub. Date Jun. 18, 1998The invention relates to a device used to connect a longitudinal support to a pedicle screw by an accommodating head having a channel to accommodate the longitudinal support, wherein it is possible to freely choose from or mix laterally open, top open or closed accommodating heads. A top open accommodating head facilitates, for example, insertion of the longitudinal support, whereas a lateral opening enables lateral corrections. The pedicle screw and the accommodating head are connected via a conical collet chuck in the accommodating head and by a spherical head on the pedicle screw. The present invention allows engagement of the pedicle screw in the accommodating head after the pedicle screw has been inserted into bone.
Inventors
- 👤 Fridolin SCHLÄPFER
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 05:16
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/70; A61B17/7001; A61B17/7035; A61B17/7037; A61B17/7041; A61B17/7032; A61B17/7034
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
208 words
Device for the connection of a longitudinal support (1)
with a pedicle screw (2) within a fixation system of the
vertebral column, with a retainer head (3) with a central axis
(4) and a channel (5) running transverse to the longitudinal
axis (4) for the acceptance of the longitudinal support (1),
with an upwardly open receiving means (33) for the acceptance
of a tension means (10;17) as well as a downwardly open cavity
(6) tapering downwards with the central axis (4) wherein a
spring chuck (7) with the central axis (4) is accommodated
coaxially gliding which is shaped to springably accept the
head (9) of a pedicle screw (2) whereby the cavity (6) runs
upwardly in axial direction into the receiving means (33) of
the tension means (10;17), characterised in that the spring chuck (7) is downwardly pressable and radially
compressible either directly or indirectly by means of the
tension means (17;17); and that the spring chuck (7) is shaped as a hollow truncated cone and
provided with at least four slots (8) running axially whereby
an amount is running into the basic area (34) and another
amount is running into the top area (35) of the spring chuck
(7) which is shaped as a hollow truncated cone.
Claim 2
Dependent Claim
38 words
Device according to claim 1, characterized in that the
slots (8) are alternatively running into the basic area (34)
and in the top area (35) of the spring chuck (7) which is
shaped as a hollow truncated cone.
Claim 3
Dependent Claim
26 words
Device according to claim 1 or 2, characterized in that the
spring chuck (7) is provided with at least 6, preferably at
least 8 slots (8).
Claim 4
Dependent Claim
26 words
Device according to one of the claims 1 to 3, characterized
in that the spring chuck (7) is shaped rotationally symmetrical
to the central axis (4).
Claim 5
Dependent Claim
40 words
Device according to one of the claims 1 to 4, characterized
in that the spring chuck (7) which is shaped as a hollow
truncated cone provides a half cone angle α/2 of 3° - 8°,
preferably of 5° - 7°.
Claim 6
Dependent Claim
39 words
Device according to one of the claims 1 to 5, characterized
in that the cavity (6) which is shaped as a hollow truncated
cone provides a half cone angle α/2 of 3° - 8°, preferably of 5°
- 7°.
Claim 7
Dependent Claim
41 words
Device according to one of the claims 1 to 6, characterized
in that the spring chuck (7) which is shaped as a hollow
truncated cone is compressible in its diameter for 0,8 - 1,2 mm,
preferably for 0,9 - 1,1 mm.
Claim 8
Dependent Claim
42 words
Device according to one of the claims 1 to 7, characterized
in that the spring chuck (7) which is shaped as a hollow
truncated cone is radially expandable in its diameter for
0,3 - 0,6 mm, preferably for 0,35 - 0,45 mm.
Claim 9
Dependent Claim
31 words
Device according to one of the claims 1 to 8, characterized
in that the spring chuck (7) which is shaped as a hollow
truncated cone is concavely shaped in its interior.
Claim 10
Dependent Claim
32 words
Device according to claim 9, characterized in that the
spring chuck (7) which is shaped as a hollow truncated cone is
shaped as a layer of a hollow sphere in its interior.
Claim 11
Dependent Claim
26 words
Device according to claim 9, characterized in that the
spring chuck (7) which is shaped as a hollow truncated cone is
toroidally shaped in its interior.
Claim 12
Dependent Claim
33 words
Device according to one of the claims 1 to 8, characterized
in that the spring chuck (7) which is shaped as a hollow
truncated cone is shaped as hollow cylinder in its interior.
Claim 13
Dependent Claim
56 words
Device according to one of the claims 1 to 12, characterized
in that the spring chuck (7) provides in its lower section a
cone (27) which extends downwardly so that the shaft (26) of the
pedicle screw (2) is fixable at an angle α of - 25° to + 25°
compared to the central axis (4).
Claim 14
Dependent Claim
27 words
Device according to one of the claims 1 to 13, characterized
in that the spring chuck (7) is through open in direction of the
central axis (4).
Claim 15
Dependent Claim
28 words
Device according to one of the claims 1 to 14, characterized
in that it additionally comprises a pedicle screw (2) with a
head (9) which is preferably spherical.
Claim 16
Dependent Claim
31 words
Device according to claim 15, characterized in that the head
(9) of the pedicle screw (2) is provided with a structure
preferably in the shape of transverse grooves respectively
transverse fins.
Claim 17
Dependent Claim
24 words
Device according to claim 15 or 16, characterized in that the head (9) of the pedicle screw (2) is provided with a hexagon
socket.
Claim 18
Dependent Claim
44 words
Device according to one of the claims 1 to 17, characterized
in that the interior of the spring chuck (7) which is shaped as
a hollow truncated cone is provided with a structure (29)
preferably in the shape of transverse grooves respectively
transverse fins.
Claim 19
Dependent Claim
55 words
Device according to one of the claims 15 to 18, characterized in that the pedicle screw (9) is made of a harder
material, preferably of the alloy Ti-Al-Nb, than the surface of
the interior of the spring chuck (7) which is shaped as a hollow
truncated cone and is preferably made of technical pure titan.
Claim 20
Dependent Claim
49 words
Device according to one of the claims 15 to 19, characterized in that the diameter of the spherical head (9) of
the pedicle screw (2) and of the corresponding hollow in the
spring chuck (7) amounts to between 6 and 10 mm, preferably to
between 7,5 - 8,5 mm.
Claim 21
Dependent Claim
47 words
Device according to one of the claims 15 to 20, characterized in that the distance between the center of the
spherical head (9) and the longitudinal axis (32) of the
longitudinal support (1) amounts to between 4 and 10 mm,
preferably to between 6 - 8 mm.
Claim 22
Dependent Claim
47 words
Device according to one of the claims 1 to 21, characterized
in that it comprises a tension means (10;17) through which the
longitudinal support (1) is directly or indirectly, preferably
via a sleeve (16) axial and rotatory fixable in the retainer
head (3) in a detachable manner.
Claim 23
Dependent Claim
62 words
Device according to one of the claims 1 to 22, characterized
in that the central axis (4) leads through the channel (5) and
the extension (11) of the cavity (6) reaches into the channel
(5) so far that the tension means (10) presses the spring chuck
(7) downwards and radially compresses it via the longitudinal
support (1) inserted in the channel (5).
Claim 24
Dependent Claim
47 words
Device according to one of the claims 1 to 23, characterized
in that a preferably hollow cylindrical insert (12) is provided
in the cavity (6) above the spring chuck (7) on that the
longitudinal support (1) can be effective to press the spring
chuck (7) axially downwards.
Claim 25
Dependent Claim
51 words
Device according to one of the claims 1 to 23, characterized
in that in a polygonal cavity (6) above the spring chuck (7) a
complementarily polygonal insert (12) is provided which is
preferably penetrated on which the longitudinal support (1) can
be effective to press the spring chuck (7) axially downwards.
Claim 26
Dependent Claim
32 words
Device according to one of the claims 1 to 25, characterized
in that the channel (5) is upwardly open in such manner that the
retainer head (3) is shaped as a yoke.
Claim 27
Dependent Claim
55 words
Device according to one of the claims 1 to 26, characterized
in that the retainer head (3) provides a through hole (13) being
threaded, upwardly open and communicating with the channel (5),
wherein a tension means (10) is screwable such that a
longitudinal support (1) inserted in the channel (5) is fixable
axially and rotatively.
Claim 28
Dependent Claim
28 words
Device according to one of the claims 1 to 25, characterized
in that the channel (5) is open to one side to sidewardly accept
the longitudinal support (1).
Claim 29
Dependent Claim
89 words
Device according to one of the claims 1 to 25, characterized
in that the channel (5) is open to one side to sidewardly accept
the longitudinal support (1) and the retainer head (3) provides
an external thread (15) at its upper section and that
additionally a hollow cylindrical sleeve (16) with recesses (18)
and a screw nut (17) corresponding to the external thread (15)
are provided by what means a longitudinal support (1) inserted
into the channel (5) is fixable axially and rotatively by means
of the sleeve (16).
Claim 30
Dependent Claim
24 words
Device according to one of the claims 1 to 21, characterized
in that the central axis (4) is situated outside of the channel
(5).
Claim 31
Dependent Claim
24 words
Device according to one of the claims 1 to 29, characterized
in that the tension means (10) directly presses on the spring
chuck (7).
Claim 32
Dependent Claim
33 words
Device according to one of the claims 1 to 29, characterized
in that the tension means (10) presses indirectly on the spring
chuck (7) via an insert (12) which is preferably hollow
cylindrical.
Claim 33
Dependent Claim
18 words
Device according to one of the claims 30 to 32, characterized in that the channel (5) is closed.
Claim 34
Dependent Claim
18 words
Device according to one of the claims 30 to 32, characterized in that the channel (5) is open.
Claim 35
Dependent Claim
26 words
Device according to one of the claims 30 to 34, characterized in that the tension means for the longitudinal
support (1) is a locking screw (31).
Claim 36
Dependent Claim
49 words
Device according to one of the claims 30 to 35, characterized in that the distance between the central axis (4)
and the longitudinal axis (32) of the longitudinal support (1)
amounts at least half of the sum of the diameters of the
longitudinal support (1) and the cavity (6).
Claim 37
Dependent Claim
58 words
Device according to one of the claims 1 to 28, characterized
in that the tension means presses on the spring chuck (7) via
the insert (12) and the tension means (10) for the longitudinal
support (1) is integrated in the tensioning screw (36) such that
the longitudinal support (1) and the spherical head (9) can be
separately fixed.
Claim 38
Dependent Claim
57 words
Device according to one of the claims 1 to 28, characterized
in that the tension means presses on the spring chuck (7) via
the insert (12) and the tension means (10) for the longitudinal
support (1) is integrated in the insert (12) thus that the
longitudinal support (1) and the spherical head (9) can be
separately fixed.
Claim 39
Dependent Claim
21 words
Device according to one of the claims 37 to 38, characterized in that the tension means is a tensioning screw
(36).
Claim 40
Dependent Claim
25 words
Device according to one of the claims 37 to 38, characterized in that the tension means for spring chuck (7) is
a tensioning nut (38).
References Cited (Backward Citations)
No citation records indexed.
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