Surgery – Instruments – Orthopedic instrumentation
Patent
1996-05-17
1998-02-10
Buiz, Michael
Surgery
Instruments
Orthopedic instrumentation
606 60, 606 72, 606 73, A61B 1770
Patent
active
057163561
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an anchoring member according to the preamble of claim 1 and an adjustment tool therefor.
Such an anchoring member is known from document DE 42 34 118 A. This anchoring member is perfectly suited for connection with a rod to be carried. For readjusting this anchoring member the nut member and the fixing member must be temporarily loosened to allow relative displacement between the anchoring member and the rod. Document DE 37 22 590 C discloses a positioning device for stabilizing segments of the spinal column whereby the rod is formed as a threaded rod and the rod is locked to the anchoring member by means of two nuts engaging the outside of the anchoring member and being adjustable on the threaded rod. For readjusting the position of the rod relative to the anchoring member the nuts are correspondingly rotated on the threaded rod.
It is the object of the invention to provide an anchoring member of the initially described kind and an adjustment tool therefor which, on the one hand, allows to obtain a good connection between the anchoring member and the rod and, on the other hand, provides for an easy adjustment manipulation.
This object is achieved by the anchoring member as defined in claim 1 and by the adjustment tool as defined in claims 28 and 39, resp..
Further embodiments of the invention are defined in the dependent claims.
Further features and advantages of the invention will be apparent from the description of an embodiment with reference to the Figures. In the Figures:
FIG. 1 is a lateral view of an anchoring member and a side view perpendicularly thereto;
FIG. 2 shows a portion of the anchoring member according to a first embodiment with a rod placed therein, in sectional representation;
FIG. 3 is a sectional view along line III--III in FIG. 2;
FIG. 4 is a sectional view of a second embodiment;
FIG. 5 is a sectional view along line V--V in FIG. 4;
FIG. 6 is a sectional view of a third embodiment;
FIG. 7 is a sectional view along line VII--VII in FIG. 6;
FIG. 8 is a sectional view of a further modified embodiment;
FIG. 8a shows a detail of FIG. 8 in enlarged representation;
FIG. 9 is a sectional view along line IX--IX in FIG. 8;
FIG. 10 is an exploded representation of the embodiment shown in FIG. 8;
FIG. 11 is a sectional view of a further modified embodiment;
FIG. 12 is a sectional view along line XII--XII in FIG. 11;
FIG. 13 is an exploded representation of the embodiment shown in FIGS. 11 and 12;
FIG. 14 is a partial sectional view of FIG. 13 along line XIV--XIV in FIG. 13;
FIG. 15 is an exploded representation of a further embodiment;
FIG. 15a is a sectional view along line XV--XV in FIG. 15;
FIG. 16 shows the embodiment in assembled state;
FIG. 17 is a sectional view along line XVII--XVII in FIG. 16;
FIG. 18 is a sectional view of a further embodiment;
FIG. 19 is an exploded representation of this embodiment;
FIG. 20 is a detailed representation;
FIG. 20a is a sectional view along line XX--XX in FIG. 20;
FIG. 21 is a partially sectional view of an adjustment tool; and
FIG. 22 is a sectional view of the anchoring member with the rod placed therein and with inserted adjustment tool.
The anchoring member shown in FIG. 1 comprises a screw 1 for insertion into the spinal column, the screw having a threaded shaft 2 and a head 3. The head comprises a U-shaped recess 4 which is symmetric with respect to the center axis of the threaded shaft 2 and has a base 5 at the side of the threaded shaft. The lateral wall of the head defining the U-shaped recess 4 is formed by lateral free legs 6, 7. A bore having an internal screw thread 8 is provided within the channel formed by the U-shaped recess 4 and formed coaxially with the center axis of the threaded shaft 2. The head 3 itself is cylindrical and has an external screw thread 8'.
In order to allow the anchoring of a rod 9 by means of this screw a locking member 10 formed as a screw is provided. The locking member 10 has an external thread cooperating with the internal screw thread 8 for screwing into the U-shaped recess 4. The l
REFERENCES:
patent: 5496321 (1996-03-01), Puno et al.
patent: 5545165 (1996-08-01), Biederam et al.
Biedermann Lutz
Harms Jurgen
Buiz Michael
Neuner George W.
Shaz Daphna
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