Process for producing endoprostheses
First Claim
1. Process for producing endoprostheses, in particular individually constructed implants and augments for reconstructive head surgery, in which the data block of a three-dimensional actual model of the existing bone structure of a patient is acquired by means of computertomography,the actual model so acquired is subtracted in a computer from the data block of an existing or computertomographically acquired, three-dimensional reference model, and a computer-internal model for the endoprosthesis is formed based on the difference of the data blocks, said model being adapted on the video screen of the computer by interactive manipulation of the data to the special anatomical features of the patient, and the data block of such model being finally used for the computer-controlled manufacture of the endoprosthesis, comprising converting the data blocks of the actual model (10) and of the reference model (14) into the data of a CAD free-form surface geometry describing the limiting surfaces of the models by Spline and Bezier functions oriented to the points of support, and shown as superimposed imaging on the video screen of the computer;
- and that based on said imaging, part areas of the interface (11) of the actual model (10) are recessed by support-point displacement in the direction of the volume of the reference model (14).
0 Assignments
0 Petitions
Accused Products
Abstract
A process for producing endoprosthesis has the data block of a three-dimensional actual model (10) of the existing bone structure of a patient acquired using CT scanning. In a computer the actual model (10) thus determined is subtracted from the data block of an existing or CT scan-generated three-dimensional reference model (14). Then from the difference a computer-internal model for the endoprosthesis is formed. With this process, it is possible to reduce the work required for making the corrective adaptation of the endoprosthesis and to avoid faulty adaptations. The data blocks of the actual model (10) and reference model (14) are converted into the data of a CAD free form surface geometry. This is done by describing the limiting surfaces of the models through Spline and Bezier functions oriented to points of support and are imaged, and superimposed, on the computer monitor. This imaging is used to take back segments of the interface (11) of the actual model (10) by displacing points of support toward the volume of the reference model (14).
312 Citations
3 Claims
-
1. Process for producing endoprostheses, in particular individually constructed implants and augments for reconstructive head surgery, in which the data block of a three-dimensional actual model of the existing bone structure of a patient is acquired by means of computertomography,the actual model so acquired is subtracted in a computer from the data block of an existing or computertomographically acquired, three-dimensional reference model, and a computer-internal model for the endoprosthesis is formed based on the difference of the data blocks, said model being adapted on the video screen of the computer by interactive manipulation of the data to the special anatomical features of the patient, and the data block of such model being finally used for the computer-controlled manufacture of the endoprosthesis, comprising converting the data blocks of the actual model (10) and of the reference model (14) into the data of a CAD free-form surface geometry describing the limiting surfaces of the models by Spline and Bezier functions oriented to the points of support, and shown as superimposed imaging on the video screen of the computer;
- and that based on said imaging, part areas of the interface (11) of the actual model (10) are recessed by support-point displacement in the direction of the volume of the reference model (14).
- View Dependent Claims (2, 3)
Specification
-
- Resources
-
Current AssigneeDieter Kruse, Egbert Machtens, Hans Seifert, Harald Eufinger, Lothar Heuser
-
Original AssigneeDieter Kruse, Egbert Machtens, Hans Seifert, Harald Eufinger, Lothar Heuser
-
InventorsEufinger, Harald, Seifert, Hans, Machtens, Egbert, Heuser, Lothar, Kruse, Dieter
-
Primary Examiner(s)Elmore, Reba I.
-
Assistant Examiner(s)PATEL, RAMESH B
-
Application NumberUS08/652,601Time in Patent Office750 DaysField of Search364/468.28, 364/468.04, 364/468.24, 364/468.25, 364/474.05, 364/474.24, 364/512, 364/468.03, 364/468.01, 364/468.26, 364/474.2, 623/20, 623/18, 623/21, 623/22, 623/23, 623/66, 623/2, 623/137, 137/512.1, 137/527, 128/653, 128/303US Class Current700/117CPC Class CodesA61C 9/0093 Workpiece supportA61F 2/2803 for mandibular reconstructi...A61F 2/30942 for designing or making cus...A61F 2002/2807 Chin implantsA61F 2002/30948 using computerized tomograp...A61F 2002/30952 using CAD-CAM techniques or...G05B 19/4099 Surface or curve machining,...Y02P 90/02 Total factory control, e.g....
