Surgery – Truss – Perineal
Patent
1990-05-15
1993-08-10
Cohen, Lee S.
Surgery
Truss
Perineal
A61B 1722
Patent
active
052339807
DESCRIPTION:
BRIEF SUMMARY
The present invention relates essentially to a device generating shockwaves for the touchless destruction of targets, preferably constituted by concretions, such as kidney lithiases or cholelithiases, said shockwaves being felt only slightly, if at all, by the patients, thus permitting a treatment without anaesthesia, and to a truncated ellipsoidal reflector and a shockwave generating apparatus for applying said process.
An apparatus is known from U.S. Pat. No. 2,559,227 to RIEBER, for generating high frequency shockwaves into a liquid for touchless destruction of targets which is herein incorporated by reference. Said apparatus comprises a shockwave generator formed by a truncated reflector 80 comprising a cavity 81 constituting a chamber of same truncated ellipsoidal shape for reflecting the shockwaves. One of the two focus points of the ellipsoid is situated inside the chamber opposite the truncated part, said chamber being filled with a shockwave transmitting liquid 83, e.g. an oil. Said chamber is closed by a membrane designated by the reference 37.
The current shockwave generating device conventionally comprises two electrodes 12, 13 disposed at least partly inside the chamber 81, both electrodes being so arranged as to generate a discharge or electric arc to the focus 14 situated in the chamber opposite the truncated part.
Means 10, 11 are also provided for selectively and instantaneously delivering a voltage to the two electrodes 12, 13 thereby causing the discharge or electric arc between the electrodes thus generating shockwaves in the liquid contained in the chamber.
In the RIEBER document, an electric power generator 10 is provided, particularly a battery 34, which selectively supplies a transformer 33 and a capacitor 11. This capacitor can be charged up to a voltage of 15,000 volts and have a capacitance of 1 microfarad in order to generate the electric arc or discharge between the electrodes in selective manner at preset intervals.
It is indicated that the value of the applied voltage and the size of the capacitor are dependent on the nature of the proposed use, whether the object is to destroy tissues or simply to stimulate them.
This apparatus is used in the medical field, particularly for destroying tissues. This apparatus can also be used for exploration purposes or for stimulating various parts of the nervous system.
This apparatus can also be used for extra-corporeal lithotripsy.
Document FR-A-2 247 195 also describes a similar apparatus in which the liquid is constituted by water.
Up to now, the technological improvements which have been brought to the RIEBER apparatus concern in particular the design of the electrodes (EP-A-0 124 686 or FR-A-2 593 382 or FR-A-2 598 074).
Other improvements concern the electrical power supply connection (FR-86 09 474).
No prior research had been made towards improving the patients' treatment conditions.
The present inventors have found that the treatment with shockwaves of patients suffering from lithiases could be carried out with this method without a local or general anesthesia.
Once the patient has been prepared and placed under anesthesia a constant watch has to be kept until the end of the treatment.
It is a fact that an anesthesia presents a definite risk for the patient, and its administration requires an important and expensive equipment as well as a highly qualified personnel to operate the necessary observation.
The present invention is therefore based on the results of research conducted with a view to reducing the patients' treatment and hospitalization time and so improving their comfort by destroying targets, such as lithiases (lithotripsy) without anaesthesia.
Accordingly, it is one main object of the invention to solve the new technical problem which consists in providing a solution for treating patients with shockwaves without anesthesis.
Another object of the present invention is to solve the new technical problem consisting in providing a solution for carrying out shockwave treatments to destroy targets constituted by concretions, s
REFERENCES:
patent: 2559227 (1951-07-01), Rieber
patent: 4915094 (1990-04-01), Lacruche
Biomedizinische Technik, vol. 22, No. 7-8, Jul.-Aug. 1977, B. Forssmann et al., "Eine Methode zur Beruhrungsfreien Zertrummerung von Nierensteinen durch Stosswellen", especially pp. 164-169; p. 166, lines 16-37; FIG. 2.
IEEE 1977 Ultrasonics Symposium Proceedings, Phoenix, Ariz., /Oct. 26-28, 1977, editors J. de Klerk et al., IEEE, Inc. (New York, US), H. Finkler et al., "Experiments with Focussing Devices for the Touchless Destruction of Kidney Stones," especially pp. 157-160 and p. 157 Focussing Devices.
Forsmann et al., "Extra Corporeal Shock Wave Lithotripsy", Editor Ch. Chaussy, Munich, 1982, pp. 1-112.
Cathignol Dominique
Lacruche Bernard
Mestas Jean-Louis
Cohen Lee S.
Inserm
Pfaffle K. M.
Technomed International (Societe Anonyme)
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