Surgery – Instruments – Orthopedic instrumentation
Reexamination Certificate
2001-09-20
2003-09-16
Philogene, Pedro (Department: 3732)
Surgery
Instruments
Orthopedic instrumentation
C606S131000, C606S075000
Reexamination Certificate
active
06620164
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a rod plate for a cervical vertebra which connects and bonds a cranium portion and a cervical vertebra portion, and a connector for connecting them. More particularly, the present invention relates to a rod plate for a cervical vertebra which can easily mount to the cranium portion, and a connector which can set a mounting angle of the rod plate for the cervical vertebra and an implant to a desired angle.
2. Description of the Related Art
As a structure of a connector for a rod plate and a structure of the rod plate according to the related art, there are structures shown in
FIGS. 1
,
2
and
3
.
At first, the related art concerning the connector portion will be described with reference to
FIGS. 1 and 2
. The structure is made such that a flat portion
5
is provided in a head portion of a screw portion
3
screwed and inserted as an implant screwed and inserted to a body of vertebra in a vertebral bone, and a U-shaped groove
7
is provided in the flat portion.
Then, a connector
11
for connecting a bone connecting rod
9
, for example, connecting a vertebral bone and a vertebral bone and the implant
1
described above is provided with a connector main body
15
having an oblong through hole
13
freely inserting through the rod
9
. A protruding portion
17
freely engaged with and disengaged from the U-shaped groove
7
of the implant
1
is provided in the connector main body
15
, and a semicolumnar engaging portion
19
which is slightly longer in the same direction as a penetrating direction of the through hole
13
is provided at a front end of the protruding portion
17
.
A rectangular portion
21
is formed in a side of the protruding portion
17
of the connector main body
15
, and an annular lock member
23
is slidably fitted and supported to the rectangular portion
21
. A lot of radial grooves are formed on a contact surface on which the lock member
23
is brought into contact with the flat portion
5
in the implant
1
, around an axis of the protruding portion
17
, whereby a concavo-convex surface
25
is formed, and a contact surface
5
a
of the flat portion
5
in the implant
1
is formed in the similar concavo-convex surface.
In order to fasten and fix the rod
9
inserted to the through hole
13
, a screw hole
31
freely screwing a fastening screw
27
is provided in the connector main body
15
. The screw hole
31
is formed in an inclined manner with respect to the through hole
13
in such a manner as to press the rod
9
in a direction of the lock member
23
by the front end portion of the screwed fastening screw
27
.
Accordingly, when engaging the protruding portion
17
of the connector main body
15
with the U-shaped groove
7
of the implant
1
, positioning the flat portion
5
of the implant
1
between the engaging portion
19
and the lock member
23
, inserting the rod
9
to the through hole
13
and thereafter fastening the fastening screw
27
, the rod
9
is moved in the direction of the lock member
23
by the front end portion of the fastening screw
27
, the concavo-concave surface
25
of the lock member
23
is brought into contact with the contact surface
5
a
of the flat portion
5
in the implant
1
and the concave-convex surfaces are engaged with each other, so that it is possible to fix the rod
9
to the implant
1
.
Next, the related art of the rod plate for the cervical vertebra connected to the above connector will be described with reference to FIG.
3
.
A fixing device
86
is structured such as to be provided with a mounting portion
81
to a cranium portion
85
and a mounting portion
83
to a cervical vertebra
82
, the mounting portion
83
to the cervical vertebra
82
is formed in a rod shape, and the mounting portion
81
to the cranium portion
85
is formed in a flat shape. Further, the flat mounting portion
81
is suitably bent with respect to the rod-shaped mounting portion
83
and is bent in a circular arc shape so as to be asymmetrical.
The rod-shaped mounting portion
83
is integrally supported and fixed to a supporting and fixing device
84
suitably mounted to the cervical vertebra
82
, and is integrally fixed to the flat-shaped mounting portion
81
in the cranium
85
by inserting the screw
80
to the mounting hole provided in the mounting portion
81
and screwing to the cranium
85
.
In the connector structure as described above, since the structure is made such as to press the lock member
23
via the rod
9
, it is impossible to stably mount the connector main body
15
to the implant
1
in a state that the rod
9
is not inserted to the through hole
13
of the connector main body
15
, so that there is a problem that it is hard to set the connector,
Moreover, in the structure of the rod plate connected to the connector described above, since the shapes are different between right and left, it is necessary to properly use the right and left parts and it is necessary to independently manufacture them, so that it is hard to manufacture them. Further, there is a problem that it is not easy to align the longitudinal direction of the rod-shaped mounting portion with the supporting and fixing device.
SUMMARY OF THE INVENTION
The present invention is made by taking the problems in the related art as described above into consideration. According to a first aspect of the present invention, there is provided a connector connecting an implant screwed and inserted to a body of vertebra to a bone connecting rod, comprising: a first fastening member provided with an engagement hole freely engaging with a head portion of the implant and a fastening groove; and a second fastening member provided with an insertion hole freely inserting the rod therethrough and a fastening groove, wherein a through hole penetrating in a direction crossing to the fastening groove in the first fastening member and a through hole penetrating in a direction crossing to the fastening groove in the second fastening member are provided with fastening devices freely penetrating.
Moreover, in the connector described above, the structure may be made such that the fastening device is a bolt, and a screw hole portion freely engaging with the bolt is formed in one end side of the through hole in the first fastening member or in one end side of the through hole in the second fastening member.
Moreover, in the connector described above, the structure may be made such that plural kinds of tool engagement portions are provided in a head portion of the bolt.
Moreover, in the connector according to the first aspect, the structure is made such that a plurality of engagement portions are provided in a circular arc direction around the through hole, on a connecting surface between the first fastening member and The second fastening member, whereby an angle adjusting and engaging portion is provided.
A rod plate according to the present invention is a cervical vertebra rear portion fixing device in which a mounting portion to a cervical vertebra is formed as a rod portion, a mounting portion to a cranium portion is formed in a flat and substantially fan shape, and a plurality of mounting holes are provided in the flat-shaped mounting portion, wherein the flat-shaped mounting portion is formed to be symmetrical and a plurality of mounting holes are arranged In a symmetrical manner so as to be formed to be common between the right and left sides.
In a system connecting a rod plate for a cervical vertebra in which a mounting portion to a cervical vertebra is formed as a rod portion, a mounting portion to a cranium portion is formed in a flat shape, a plurality of mounting holes are provided in the flat-shaped mounting portion, the flat-shaped mounting portion is formed to be symmetrical, and a plurality of mounting holes are arranged in a symmetrical manner so as to be formed to be common between the right and left sides, to an implant screwed and inserted to a body of vertebra, the structure may be made such that the system is provided with a first fa
Echigoya Naoki
Ina Noriyuki
Oribe Kazuya
Sannohe Akio
Ueyama Kazumasa
Greenblum & Bernstein P.L.C.
Philogene Pedro
Showa Ika Kohgyo Co., Ltd.
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