Surgery – Instruments – Orthopedic instrumentation
Reexamination Certificate
1999-08-30
2001-06-05
Smith, Jeffrey A. (Department: 3732)
Surgery
Instruments
Orthopedic instrumentation
C606S130000
Reexamination Certificate
active
06241735
ABSTRACT:
CROSS-REFERENCES TO RELATED APPLICATIONS
Not applicable.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not applicable.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a system for bone segment navigation.
2. Discussion of Relevant Art
A system of this kind is known from U.S. Pat. No. 5,279,309 in which the position of the bone segment is sensed by means of markers which are arranged, at a spacing from the bone segment surface, on needles which penetrate into the bone segment surface.
However, this arrangement of the markers, constituted as light emitting diodes (LED), basically leaves open their exact spatial relationship to the bone segment or to a preoperative data set obtained by computerized tomography (CT). This can be obviated by producing the preoperative data set with the needles already inserted into the bone segment, but this of course makes necessary a surgical operation for setting the marker needles which precedes the bone segment displacement proper and which is stressful for the patient, and an additional, so-called planning CT, on which the marker needles are reproduced.
Another possible method of setting the markers in a spatial relationship to the bone segment, as also mentioned in U.S. Pat. No. 5,279,309, consists of sensing both the markers and also the bone segment with the tip of a feeler pin or pointer, the position of which can be measured by means of the position sensing unit. The spatial relationship of the markers relative to the bone segment can be established when, during the operation, unambiguously recognizable points both on the bone segment itself and also in the data set, so-called characteristic points, are touched and sensed according to position. However, the characteristic points then have to be touched and sensed according to position in a time-consuming manner during the operation. Furthermore, this has the precondition that such characteristic points exist.
This is of course not the case in many bone segments, so that the position determination of the bone segment itself as mentioned in U.S. Pat. No. 5,279,309 is not possible with the accuracy required in some cases of application.
SUMMARY OF THE INVENTION
The invention has as its object to provide a system for bone segment navigation, with which the position of any bone segments can be reliably, accurately and rapidly sensed, without having to touch bone points individually and sense them according to position, during the operation.
This object is attained by a system of bone segment navigation comprising:
a planning unit for planning a bone segment displacement,
a marker arrangement to be connected to a bone segment,
a position sensing unit that senses the position of said marker arrangement, an indication and processing unit connected to said position sensing unit and to said planning unit, in order to indicate a deviation of a present position of said bone segment from a planned bone segment position or from a planned bone segment displacement path, and a template allocated to said bone segment that connects said marker arrangement to said bone segment.
Then by the connection of the marker arrangement with the bone segment by means of a template which is individually associated with the bone segment, there is no longer an assignment to individual characteristic points, but the whole surface of the bone segment can instead be used for an unambiguous allocation of the position of the marker arrangement with the bone segment. After the setting in place and fastening of the template on the bone segment, a correlation is then possible between the patient and an imaging data set or planning data set, without touching and position sensing of individual bone points.
The dependent claims relate to further advantageous embodiments of this invention.
REFERENCES:
patent: 5086401 (1992-02-01), Glassman et al.
patent: 5143086 (1992-09-01), Duret et al.
patent: 5249581 (1993-10-01), Horbal et al.
patent: 5279309 (1994-01-01), Taylor et al.
patent: 5389101 (1995-02-01), Heilbrun et al.
patent: 5880976 (1999-03-01), DiGioia, III et al.
patent: 6006126 (1999-12-01), Cosman
patent: 6074394 (2000-06-01), Krause
patent: 42 19 939 A1 (1992-06-01), None
LandOfFree
System and method for bone segment navigation does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System and method for bone segment navigation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System and method for bone segment navigation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2535784