Surgery – Instruments – Stereotaxic device
Patent
1996-09-10
1998-05-26
Buiz, Michael
Surgery
Instruments
Stereotaxic device
A61B 1900
Patent
active
057557250
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an installation for computer-assisted stereotactic microsurgery.
2. Description of the Related Art
Such installations are known in the state of the art. For example, French Patent FR 2651760 describes a method for the precise localization of a lesion and a device for the implementation of this method. The invention relates to a device and a method for the precise localization of a lesion. The method in accordance with the invention is characterized in that the organ to be examined is immobilized in the same position as that of the biopsy to be performed, tomodensitometric axial (XY) sections of the organ are performed through at least one transparent rectangle fitted with three nonsymmetrical concurrent opaque threads occupying determined positions in relation to the biopsy equipment, the lengths of the two segments (AB, AC) intercepted by said opaque threads for a selected lesion section are measured, at least one image is taken in the specimen removal position, the traces of the three opaque threads are reconstructed on said image and one transfers onto said image the lengths (AB, AC) of the measured segments in order to determine the lesional baseline corresponding to the selected lesional section.
Implementation of this method entails complete immobilization of the patient.
Another French patent published as number FR 2686499 describes a device for treating a target such as a lesion inside the body, using a marker element implanted in or near the target to direct the treatment of said target. This therapeutic device comprises: example mechanically or electrically, to the therapeutic means, therapeutic means using the localization means,
The localization means identify the localization of at least one marker element implanted in the interior of the lesion. The calculation means calculate the position coordinates of the marker element (M0, M1, M2, M3) in relation to the therapeutic means which are used for the positioning of the mobile therapeutic means in the space of any position according to the X, Y, Z axes. This device enables precise treatment of the lesion.
Such a device requires intense presurgical preparation for its implementation.
French patent FR 2682778 describes a microscope for computer-assisted stereotactic microsurgery and a method for its operation. This microscope comprises detectors that detect optical data, a position identification system and a process control device that evaluates the signals from the said system. This system is an optics-based system integrated into the optical system of the microscope and it is provided with a device that converts the signals output by the device into a two-dimensional graphical representation.
Another patent of the prior art, patent PCT/FR090/00714, discloses an installation in which the principal reference system is linked to the patient's bed. The patient is immobilized in relation to the bed by a retention helmet or equivalent means. This document of the prior art discloses that the system has marked positioning means 2 linked in relation to the reference system R2 of the structures SNH and SR. For example, the head is fixed on the operating table.
This solution is not completely satisfactory because the retention means reduce the possible routes of access and impose constraints that are restrictive for the surgeon, who must assume that the position of the patient is fixed definitively as of the beginning of the intervention.
In addition, the operating table never exhibits absolute mechanical rigidity, and the correlation between the patient and the virtual images does not exhibit an adequate degree of precision for certain interventions.
Patent WO92/06644 describes a radiotherapy installation with means for attaining concordance between the radiation sources and previously obtained images. This document does not mention the use of a reference system corresponding to the fixed-reference system of the applicant's invention, which is additionally not necessa
REFERENCES:
patent: 5251127 (1993-10-01), Raab
Buiz Michael
Deemed International, S.A.
Woo Julian W.
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