Surgery – Truss – Pad
Patent
1990-01-16
1992-02-18
Hindenburg, Max
Surgery
Truss
Pad
12142N, A61B 5103
Patent
active
050885030
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method and apparatus for measuring parameters, and has particular applicability to the production of shoe inserts and the like.
The term "inserts" is to be understood here as a generic term for technical objects which are brought into force-locking and/or form-locking union with parts of the human body. A typical example are orthopedic inserts or insoles which are to be adapted to the foot of a patient, and also, of course, of healthy persons. Also involved is seating or lounging furniture which is to be adapted to the respective body parts of the user. Also it means prostheses or ortheses which are to he adapted to the stump of a limb. Further the invention also involves the adaptation of dental prostheses (full prostheses as well as single teeth or crowns) which are to be adapted, especially taking into consideration the movement geometry of the chewing apparatus, to the opposite (natural or likewise artificial) teeth.
In making orthopedic inserts (and also e.g. prostheses or corsets) present practice is to perform a (three-dimensional) survey of the forms to be adapted or to be corrected. This survey can take place through impressions in thermosetting compounds or by direct (optical) surveying. In any case, therefore, one proceeds practically exclusively from three-dimensional contours, and moreover generally in the unstressed state of the respective body part.
It has now been found that inserts, prostheses or also seating or lounging furniture made on the basis of these surveys are often felt by the user to be unpleasant, annoying, etc. Moreover, the correction results are not optimal. Lastly, in particular in the case of inserts/insoles, the problem exists that in many points the orthopedic shoemaker works "on intuition", so that the inserts made by him are not readily to be manufactured on the basis of purely objective test data. When making dental prostheses the procedure is still more inaccurate, again simply a direct survey of the three-dimensional contours taking place, namely by way of impressions in plastic compounds and subsequent grinding down of "pressure spots" which appear on the dental prosthesis when biting on dyed paper.
OBJECTS AND SUMMARY OF THE INVENTION
Starting with the above stated prior art, it is an object of the present invention to develop a method and an apparatus of the initially mentioned kind to the effect that at little cost improved results (with respect to corrections, compatibility, etc.) can be obtained in a satisfactorily reproducible manner.
This problem is solved by the present invention. In particular that the force distribution or respectively the two- or three-dimensional pattern of the occurring forces is made use of to produce the inserts, seating furniture surfaces etc., and this in such a way that direct control of the machine manufacturing the parts becomes possible. By direct control must be understood here also the case as an inferior form of realization where a conformable reproduction of the object to be manufactured is produced by the computer and then (although somewhat laboriously) the object is made according to this conformable reproduction. Comprised here also is the printout of corresponding sets of test data. In all cases, however, satisfactory factory reproducibility of the method results, whereby the quality of the resulting product is increased and at the same time the costs are reduced.
The manufacture of orthopedic inserts can here occur so that the computer-generated control data control a numerically controlled machine for the manufacture of the insert itself. This can be done e.g. by mill cutting, by appropriate hot or cold shaping with respect to the geometric dimensions, an approximation to the "ideal" pressure pattern being produced by the respective shaping, or excessive pressures at certain points being absorbed or compensated (e.g. by depressions in the insert). If the adaptation of prostheses is involved, it is possible by the evaluation of the pressure pattern to achieve
REFERENCES:
patent: 3696456 (1972-10-01), Dunham et al.
patent: 4195643 (1980-04-01), Pratt
patent: 4517696 (1985-05-01), Schartz
patent: 4745290 (1988-05-01), Frankel et al.
patent: 4876758 (1989-10-01), Rolloff et al.
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