Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Light application
Patent
1993-02-19
1994-07-19
Sykes, Angela D.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Light application
606 2, 606 11, A61N 500
Patent
active
053305175
DESCRIPTION:
BRIEF SUMMARY
The present invention relates essentially to a device for heat treating tissue using two groups of pulse sequences.
From the documents U.S. Pat. Nos. 4,784,132, 4,800,876, and 4,848,336 (Fox) a method and a device are known for heat treating tissue using a laser provided with means enabling it to emit a large enough number of pulses of laser radiation to deliver a total amount of energy that results in said heat treatment of tissues. The laser radiation may be conveyed semi-invasively along a lumen of the body by using a catheter or an endoscope containing at least one optical fiber for transmitting the laser radiation from the source to the tissues for heat treatment. The application essentially described in those documents consists in destroying plates of arteriosclerosis. The energy used per pulse is of the order of 150 mJ to 500 mJ (column 5, line 27 of U.S. Pat. No. 4,848,336).
It is also known from an article by McCord et al. in Symposium Lasers in Medicine and Biology of Jun. 22-25, 1977, at pages 9-1 to 9-10, and in particular at page 9-5, to obtain tissue coagulation by heat treatment using laser radiation, in particular with the help of an argon laser, a CO.sub.2 laser, or an Nd:YAG laser, using pulses of a duration of 1 second (s), with a rest period of 1.3 s between pulses. McCord shows that the rest period is not long enough for the cooling to avoid the vaporization temperature. Thus, at page 9-8.4, McCord concludes that it is possible to use trains of pulsed irradiation from a neodymium YAG (Nd:YAG) laser while avoiding surface vaporization only when a sufficient amount of rest time is allowed between successive pulses, and this has the major drawback of giving rise to treatment periods that are too long, and that are unacceptable in practice.
An object of the present invention is thus to solve the novel technical problem consisting in providing a solution enabling heat treatment of tissue to be performed by pulsed laser radiation while requiring only a minimum amount of treatment time per point.
The present invention must also solve this novel technical problem by means of a solution that is versatile and that makes it possible either to perform tissue coagulation, or else vaporization, at the option of the practitioner.
The present invention must also solve this novel technical problem by means of a solution enabling the temperature of the tissue to be maintained either in the coagulation range or else in the volatilization range.
Another object of the present invention is to solve the above-specified novel technical problem by providing a solution which enables pulses of variable duration to be used, in particular by enabling them to be grouped together in pulse sequence groups.
Another object of the present invention is to solve the novel technical problem specified above by providing a solution which enables the practitioner to be provided with means that are easy, effective, and reliable for performing heat treatment of tissue with prior programming of a pulse sequence as a function of the looked-for clinical effect, mainly coagulation or volatilization of tissues, and as a function of the nature of the tissues to be treated, for example a tumor of the stomach or of the liver, a colon tumor, or neurosurgery.
All of these technical problems are solved in satisfactory manner for the first time by the present invention which is flexible in use, facilitating the performance of heat treatments of tissue by the practitioner, and in particular using language adapted to the practitioner.
Thus, in a first aspect, the present invention provides a device for heat treating tissue comprising a laser provided with means enabling laser radiation to be emitted in the form of pulses in sufficient number to deliver a total amount of energy that causes said heat treatment to be performed on tissues, the device being characterized in that it includes means for adjusting the number and the duration of the pulses, said means enabling at least two pulse sequence groups to be emitted, a first pulse sequence gr
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patent: 4887600 (1989-12-01), Watson et al.
patent: 4930505 (1990-06-01), Hatje
Brunetaud Jean-Marc
Guillet Hubert
Mordon Serge
Institut National de la Sante et de la Recherche Medicale
Sykes Angela D.
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