Optical: systems and elements – Stereoscopic – Stereo-viewers
Patent
1996-11-14
1999-04-20
Henry, Jon
Optical: systems and elements
Stereoscopic
Stereo-viewers
349 8, 349 15, 348 51, 2502011, G02B 2724
Patent
active
058962263
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The field of the present invention is an optical device for the visualization of a three-dimensional virtual image in superposition with a real object, especially for surgical applications.
2. Description of the Related Art
In the state of the art, processes are known for the construction of three-dimensional synthesized images from images obtained with imaging means such as a scanner, a tomograph or any other equivalent device. These images are then used for guiding surgical instruments.
As an example, German patent DE 3717871 describes an optical representation process and device for surgical interventions.
This process is intended for the reproducible optical representation of an intervention to be implemented with the aid of a surgical instrument. In this process the tomographic data for the part of the body in which the surgical intervention will be implemented are entered into the data memory of a data processing system. The data relative to the position of the field of intervention are determined from the tomographic data. In the process according to this prior document, the surgical instrument is fixed on a freely movable three-dimensional support, and the data relative to the position of the surgical instrument are determined by means of a coordinate measurement device and transmitted to the data processing system, which establishes a relation between the data relative to the position of the surgical instrument and the data relative to the position of the field of intervention, and with which the surgical instrument is oriented to the field of intervention by means of this relation. The process involves the following steps: determined or established as reference points on the body part, and entered into the data memory, coordinate measurement device; the measurement points contained in the tomograms and the data determined by the coordinate measurement device from the measurement points, space of the freely movable three-dimensional surgical instrument, and the position data are transmitted to the data processing system, the surgical instrument to the tomographic image data, and the data processing system produces superposition images on an output device, particularly a visualization screen, in which the tomographic image contents and the respective positions of the surgical instrument are superposed.
The processes according to the state of the art, however, do not allow satisfactory exploitation of the three-dimensional images under the usual operating conditions. The visualization devices of the prior art impose a specific operating technique, which is not very compatible with the usual movements of the visualization operator on an independent screen or on a helmet.
SUMMARY OF THE INVENTION
The goal of the present invention is to resolve these drawbacks by proposing a visualization device that can be used under the usual working conditions, notably with regard to the lighting conditions of the real object, the operator movement positions, and the modes of visual accommodation. The device according to the invention is intended, in particular, to create very luminous three-dimensional synthesized images allowing the superposition of these images on a strongly illuminated real object, e.g., illuminated by a Scialytique operating light commonly employed in operating rooms. The invention also proposes a device compatible with the aseptic conditions required for surgical use.
Although the device according to the invention is particularly suitable for application in an operating room, it is not limited to surgical use and can be employed for all other applications in the fields of recreation, education or industry.
The device according to the invention has a means for the formation of very luminous images and two semitransparent mirrors positioned between each observation point--each of the viewer's eyes--and the real observed zone, maintained in place and oriented in a manner so as to reflect each synthesized image towards the corresponding obs
REFERENCES:
patent: 4674837 (1987-06-01), Knuttel et al.
patent: 5106179 (1992-04-01), Kamaya et al.
patent: 5230623 (1993-07-01), Guthrie et al.
Eudes Michel
Peuchot Bernard
Tanguy Alain
Centre National de la Recherche Scientifique "CNRS"
Henry Jon
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