Surgery – Instruments – Light application
Patent
1991-09-12
1994-07-12
Pellegrino, Stephen C.
Surgery
Instruments
Light application
606 17, 606 13, A61B 1732
Patent
active
053284887
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to laser light apparatus for medical treatments to permit amputations, incisions, vaporization of living tissues of an animal such as a human body, thermal therapy and the like, particularly to laser light apparatus for medical treatments with good characteristics in amputations, hemostasis and anastomosis.
PRIOR ART
Medical treatments such as incisions of living tissues of animal organisms by irradiation with laser light have become common due to the hemostasis which laser treatments provide.
The conventional method has been that the laser light is irradiated from the fore end of an optical fiber which is held back out of contact with the living tissues. But this method causes severe damage to the fore end portion of the optical fiber. Therefore, a method which has been utilized lately is as discussed below.
First, laser light is transmitted into an optical fiber, whose fore end portion is located adjacent to treated living tissues. Next, the laser light fed out from the optical fiber is fed into an emitting probe, which is held in or out of contact with the living tissues. Then, the laser light is emitted from the surface of the probe for irradiating against the living tissues. In this case, the probe should be brought into contact with the living tissues (hereafter "living tissue" is sometimes expressed by "tissue" only).
The inventor developed many kinds of such contact probes which are utilized for various purposes.
When the tissues are incised with these contact probes, the tissues should be incised along an incision line repeatedly on the upper side surface of the tissues. When a blood vessel having a smaller diameter is amputated, bleeding is not caused so much, because, a target area of the blood vessel is coagulated by the laser light irradiation. However, when a blood vessel having a diameter larger than 1.5 mm is amputated, often the blood vessel should be previously tied at the both sides of the target area with a medical thread.
That is to say, if that single transmitting probe is used for amputating the thick blood vessel, the above mentioned tying of the blood vessel is required every time. Accordingly, it takes a long time to perform a medical operation. Further, a more severe problem is as follows; even if the medical thread used in the tying is fused into the living body after recovery of a patient, the thread often can not be fused completely. In this case, the patient should be operated on again for removing the medical thread, which is large burden to the patient's body.
In an incision of hemorrhagic tissues such as the liver and the like with laser light irradiation, the probe must be repeatedly moved along an incision line little by little in order to suppress the bleeding caused at the target area as much as possible. Therefore, the medical operation requires much labor and must be done carefully.
Generally, in order to eliminate bleeding problems in incising or amputating tissues, laser light should be irradiated many times. However, at the end of an incision line where incised tissues and un-incised normal tissues are adjacent each other, the laser light is often irradiated against the normal tissues by mistake. Accordingly, the normal tissues are damaged.
On the other hand, for removing a projected tumor, a ring-shaped high frequency snare is provided so as to encircle the tumor. Then, the tumor is amputated at its root with the snare. However, this treatment can not be carried out with a high level of hemostasis. Also, if physiological saline solution is used in this treatment, electrical shock may be given to a patient. Further-more, tissues around the tumor are often burned. As a result, the tissues are damaged.
It is therefore the main object of the present invention to provide laser light irradiation apparatus for medical treatments, which can amputate and incise a target area of tissues with single operation with a high level of hemostasis, while laser light is not irradiated against other normal tissues, and which can amputate a
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Harris Sonya C.
Pellegrino Stephen C.
S.L.T. Japan Co., Ltd.
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