Surgery – Truss – Pad
Patent
1993-01-22
1995-01-24
Smith, Ruth S.
Surgery
Truss
Pad
601 4, 378162, 378205, A61B 600, A61B 1722
Patent
active
053834550
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an apparatus for the generation of focussed acoustic pressure or shock waves for therapeutical applications and, in particular, for the destruction of concretions, calculi, etc., having a pressure or shock wave source, a locating device for the concretion to be destroyed provided with an X-ray machine having an aiming device, which can be projected by means of an X-ray beam from the X-ray source onto the X-ray receiver, and a patient support.
Apparatuses for the generation of focussed acoustic pressure or shock waves for therapeutical applications and, in particular, for the destruction of concretions, calculi, etc., for the acoustic radiation of body tissue in living creatures require aiming or locating devices in order to position the concretion or tissue in the focus of the pressure wave source.
STATE OF THE ART
In known apparatuses, one or several X-ray axes, which are attached in a fixed spatial arrangement at the apparatus are employed for aiming. A hairline cross on the monitor marks the intended point of penetration of a straight line from the X-ray source through the shock wave focus and through the reception plane. For localization, two X-ray pictures with different solid angles are required with the point of intersection of both straight lines having to run through the focal point or region of the acoustic waves. Both the penetrating radiation directions may be realized by two X-ray axes; as an alternative an X-ray axis may be moved mechanically in such a manner that the described straight line always runs through the focal point. For aiming precision, depending on the size of the focal point or region, a deviation of less than 1-2 mm is required. If this condition is not fulfilled, a health risk to the patient arises because the tissue next to the concretion will be hit. For this reason, a relatively technically highly complex construction is needed in order to achieve the necessary precision of movement.
Furthermore, aiming devices imaged in conjunction with the area of interest of the body on the reception surface are known from DE 39 19 083 A1. However, these aiming devices have the problem that the X-ray machine has to either be moved very precisely (fore and backsight in line with the focal point of the X-ray tube) or, if a spatial deviation of the focal point is admissable, a complex reconstruction of the focal point from the projected figures is necessary. Described are light pens with which the physician has to mark the figures on the monitor and a computer evaluation unit connected thereafter.
Thus the known aiming device is not only more time consuming for the physician, but also requires a relatively technically highly complex construction.
DESCRIPTION OF THE INVENTION
The object of the present invention is to further improve an apparatus for the generation of focussed acoustic pressure or shock waves for therapeutical applications having an X-ray locating device in such a manner that technical complexities and time consumption are distinctly reduced compared to the state of the art without detriment to locating precision and, in particular, that the received X-ray pictures can be visually evaluated.
In one solution in accordance with the present invention, the apparatus is improved by designing the aiming device in such a manner that its projection onto the X-ray receiver is a figure which is independent of the location of the X-ray source and the X-ray receiver, and a line connecting the X-ray source and the center of the projected figure always runs through a point fixed in space outside the aiming device.
The present invention is made more apparent in the following section by way of example without the intention of limiting the scope or spirit of the overall inventive idea using embodiments with reference to the accompanying drawing, to which is to be referred for the disclosure of any invented details not explained more closely herein.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows an illustration of the fundamental conc
REFERENCES:
patent: 5070861 (1991-12-01), Einars et al.
Smith Ruth S.
Storz Medical AG
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