Surgery – Instruments – Light application
Patent
1990-02-06
1992-10-27
Aschenbrenner, Peter A.
Surgery
Instruments
Light application
606 7, 128673, A61B 1700
Patent
active
051585600
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a laser operating device for intracavitary surgery, and more in particular to a laser operating device for intracavitary surgery which is used for removing a diseased part inside a cavity using laser light.
BACKGROUND OF THE INVENTION
In the prior art, there have been contrived various kinds of devices for medical treatment diagnosis and methods thereof for removing, e.g. a stenosis or occlusion of a blood vessel and an atheroma due to such as an arteriosclerosis or such as calculus in a kidney or urethra.
A bypass operation is the most assured treatment method in which a lesion is completely removed by replacing a blood vessel which includes a diseased part with one of the patient's own blood vessels or with an artificial blood vessel, for example. However, since this method is followed by a surgery in which a vital organism is cut open, the vital body is subjected to a burden and a large amount of costs is needed for the treatment. Moreover, although a drug treatment is also adopted, it is effective only for solution of a thrombus and it has been difficult to remove an atheroma focus.
Therefore, there has been recently adopted a treatment that a catheter is inserted into a tubular cavity from the outside of a body and reaches a diseased part so as to directly remove a cause of an obstacle.
One treatment is performed in a manner that a balloon catheter having a balloon attached on its distal tip portion is used and the balloon expanded when it is reaches the diseased part so that the stenosis of the tubular cavity is mechanically expanded. However, since the stenosis is simply expanded, e.g. the diseased focus of the arteriosclerosis or thrombus which causes a stenosis can not be removed, a probability of a relapse of a disease in a short period is high. Moreover, in the cases that the blood vessel is entirely occluded and that the arteriosclerosis is so advanced as to cause a calcification, it becomes difficult to treat with a blood vessel.
The other treatment is a method using laser light such as YAG laser or argon laser, wherein a metallic or ceramic chip attached to the tip of the catheter is heated by the laser light irradiated from the tip of an optical fiber so that the heated chip is pressed onto the diseased part so as to burn out the diseased part. According to this method, though the diseased part can be removed, the control of the light heating power is difficult and if the chip is overheated, a normal vessel wall is damaged or carbonized so that there may occur a new risk of vascular perforation or a new re-stenosis. Moreover, in case the vessel is tortuous or completely occluded, it is not available because the chip can not be inserted.
Therefore, it is also adopted that the laser light from such as YAG laser, argon laser or excimer laser is projected to the diseased part from the tip of the fiber so as to vaporize the diseased part directly. Since the laser light directly vaporizes the projected portion, the laser light is available also for a completely occluded diseased part. And since the output of the laser can be controlled, upon controlling the amplitude, pulse width and pulse intervals of the pulse laser, it is possible to control the power with high accuracy.
By the way, in the intracavitary laser operating device of a direct irradiation type mentioned above, the operator controls the output of the laser light source or controls the amplitude, pulse width and pulse intervals in the case of a pulse laser according to the sort of the diseased part such as atheroma, thrombus and carbonization and to the degree of the advance of the disease state, whereby the power control is performed, but it has been impossible to control the power while confirming the state of the diseased part during the irradiation of the laser.
With further detailed description, since there is a fear of damaging the cavity if a big power is abruptly projected to the diseased part by using the catheter mentioned above, it is necessary to divide the power o
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Kanazawa Shin-ichi
Niwa Shin-ichiro
Sogawa Ichiro
Uemiya Takafumi
Yotsuya Koro
Aschenbrenner Peter A.
Sumitomo Electric Industries Ltd.
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