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H YAMAMOTO, K SATO, S OOTA, S NISHIMOTO
1980 Volume 1 Issue 1 Pages
317-323
Published: 1980
Released on J-STAGE: September 24, 2012
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The effectiveness in inhibiting the formation of an in vitro incipient caries-like lesion by acoustooptically Q-switched Nd: YAG laser irradiation guided by a flexible optical fiber was investigated.
In this experiment, 100 freshly extracted non-caries human permanent teeth were used.
It is clearly indicated that remarkable acid resistance was imparted to the enamel by irradiation of this laser. The acid resistance of this laser-exposed enamel is thought to be due to a physical alteration in acid permeability from results of polarized light microscopic, X-ray diffractometric and ESR spectroscopic analyses. The improvement of the laser beam guide was also investigated for the future research in preventive dentistry.
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Hiroshi Fukuda, Kenji Hashimoto, Jose Francisco Barahona, Kazuki Haseg ...
1980 Volume 1 Issue 1 Pages
324-326
Published: 1980
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Congenital macroglossia is rare condition and may produce the difficulty of sucking and deformity of the dental arch and mandible. Partial glossectomy has been indicated to reduce the bulk of tissue present. We report the experience of congenital macroglossia patient, treated with Co
2 laser.
Case Report: A 6-year-old boy with the enlarged tongue as his chief complaint was referred to our clinic on Apr. 20, 1978. Clinical examination revealed that his tongue protruded slightly beyond the lip, tongue surface normal, over jet -8mm, over bite -7mm, diasthema in the anterior portion of the mandible.
Clinical diagnosis: Congenital macroglossia
On July 6, 1978, partial glossectomy (Obwegeser's method) was performed with knife. Operating time was 1 hr. 24 min. and bleeding was 35 gr.. But the tongue was still large in thickness, second operation was planed. On Aug. 12, 1980, we performed marginal V-excision of the tongue with CO
2 laser. Operating time was 2 hr. 20 min. and bleeding was 39 gr.. We compared 1st and 2nd operation on several points. CO
2 laser reduced the bleeding and operation was easier than with knife. But our machine has difficulty of accessibility as a cutting instrument to the oral cavity and needs the development of hand-piece types.
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Toshio MORIOKA, Kazuo SUZUKI, Narumi HATADA
1980 Volume 1 Issue 1 Pages
327-331
Published: 1980
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Studies on the effects of laser radiation on tooth surface for caries prevention have been reported, and revealed that the enamel rendered to prevent itself from acid soluble properties by the irradiation. Sealants for pit and fissure of human molars have also been provided in clinic for temporary prevention of caries.
The present study was undertaken to investigate the increment of the acid resistibility of enamel surface and adhesive capacity of the sealant simultaneously by the laser irradiation. The adhesive capacity of the sealant increased by using CO
2 laser at the energy density of 66J/cm
2, and decreased at less than 34J/cm
2. Thus, the acid resistibility of enamel increased almost linearly with the energy density. Both the adhesive capacity and acid resistibility increased favorably by using Q-switched Nd-YAG laser at the energy density of 170mJ/cm
2.
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Akinori NAGASAWA, Kouji NISHIKAWA, Kazuichi KATO, Yoshiaki HIRATSUKA, ...
1980 Volume 1 Issue 1 Pages
334-344
Published: 1980
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In application of laser to dentistry, most troublesome problems is pain associated with laser shot to a tooth. In this study, threshold of laser energy to this pain was found to be exist. If the laser energy absorbed by a tooth is within this threshold, the patients always doesn't feel any pain. In addition, repetition pulse laser technique seems to be many usefulness for its clinical application. In present study, we have tried to apply this technique in some dental treatments as mentioned below. 1) Therapy for dental hypersensitivity. 2) Etching for enamel sealant technique. 3) Silver plating technique on tooth surface. 4) Vital amputation of pulp. 5) Cautery of root pulp and root canal therapy. 6) Scaling. 7) Gingival flap operation. 8) Gingivectomy. 9) Cautery of gingival polyp. 10) Cautery of tumor. 11) Alyealectomy & alveoplasty. 12) Apicotomy. 13) Cautery of radicular granuloma or cyst.
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-Effects of submucosal blood flow in the canine stomach-
Sohtaro Suzuki, Sigeru Harasawa, Kazuhiro Kikuchi, Issei Senoue, Hiroy ...
1980 Volume 1 Issue 1 Pages
345-351
Published: 1980
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It was studied endoscopically that effects of submucosal blood flow in the canine stomach of three mongrel dogs on Nd-YAG laser radiation.
The Nd-YAG laser (Medilas; M. B. B.) was fired endoscopically at 30w, 50w & 80w by a jet of CO
2 coaxially optical fiber through the forceps channel with exposure durations of 4.0 seconds. The top of the wave guide was placed at about 1.0 to 2.0cm from the mucosal surface. At the same time, gastric submucosal blood flow was measured using hydrogen electrode through the gastric serosa and muscular layer at the lesser and greater curvature of the gastric body. Histological findings were examined with HE stain, Azan stain and E. V. G. stain.
The quartz fiber with CO
2 gas-jet was more flexible and pass through more easily to the biopsy channel of upper G. I. endoscope (GF-B
3, GIF-D
2; Olympus) than that without coaxial CO
2. In case of decreased submucosal blood flow, histological damages were noted deep through the muscular layer in the canine stomach. On the contrary, increase of submucosal blood flow resulted shallow histological change limited submucosal layer with the same exposure condition of Nd-YAG laser. It was suggested that the endoscopical application of Nd-YAG laser radiation was influenced with organic blood flow in the gastrointestinal tract.
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Kenichi ODAGIRI, Yoshiki Hiki, Tetsuhiko YAMAO, Katsunori SAIGENJI, Ha ...
1980 Volume 1 Issue 1 Pages
352-359
Published: 1980
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We have 349 cases of gastro-intestinal bleeding in which included 201 peptic bleeding ulcer cases. We researched type of endoscopical and course of bleeding in peptic bleeding ulcer. We have followed up the type III ulcer over three years by conservative treatment, though we have had no case with recurrenced and re-bleeding. So the type III ulcer is a good prognosis ulcer. Therefore, adaptation of LASER treatment for the type III ulcer's bleeding is effected. It is a safe method of Nd-YAG LASER radiation with 300 J/cm
2 within one second or 500 J/cm
2 within two seconds. It caused 70% perforation on lesser curvature wall by 600 J/cm
2 radiation, on the other hand, the rate of perforation was lower on anterior and posterior wall. Gas jet prevents the fiber from beening dusty and removes excess blood from the bleeding sight. To be successful the position of the gas jet is 10-20 mm distance from bleeding sight at 50 cc per second gas flow.
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S. Kasai, M. Mito, K. Mizushima, K. Harada, M. Namiki
1980 Volume 1 Issue 1 Pages
360-362
Published: 1980
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Laser photocoagulation is one of useful techniques to control the gastric bleeding. The high power Nd:YAG laser has a theoretical advantage because of a greater depth of tissue penetration. However, the large in depth heating generated by the laser may have some degrees of risk as the gastric perforation. In this paper were described the results of experimental investigation of the relationship between gastric wall temperature and tissue reaction by the laser irradiation in point of the perforation. The serosal temperature raised up to 70°C when a 90W-one second-3 times was used. Histologic examination revealed a depth of injury to the serosa over a 70W-one second-3 times. However, the perforation was not observed in these conditions in chronic studies.
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HIROAKI KUMAGAI, AKIRA NAKAHARA, KEIJI TUKADA, TAKAO SAKITA, HISAYUKI ...
1980 Volume 1 Issue 1 Pages
365-369
Published: 1980
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Wataru Imaoka, Minoru Yamamoto, Takahiro Kato, Keishi Takechi, Junichi ...
1980 Volume 1 Issue 1 Pages
370-374
Published: 1980
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The degree of stomach tissue injury after laser irradiation under the various laser coagulator operation. We observed the tissue damage of canine stomach after the high out put power irradiation with Nd-YAG laser coagulater. We obtained the following findings. The tissue damage is minimal and it is safe from perforation under the condition of repeating pulse irradiation with high out put power and short duration.
The laser irradiation to the ulcerative tissue have higher incidence of perforation than the irradiation to normal mucosa. When we radiate the YAG laser on the submucosal ulcerative tissue, we should not exceed 40 pulsation of the irradiation under the condition of 90 watts output power, 0.1 second irradiation time and the 1 cm distance between the gastric ulcer and tip of quartz fiber. If the laser radiates after the India ink injection into the gastric submucosal tissue, the second effects of India ink appear.
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Hiroya Umemura, Masao Kawamura, Shuji Kawai, Tadaaki Sudoh, Yoh Kasaha ...
1980 Volume 1 Issue 1 Pages
375-377
Published: 1980
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Japanese CO
2-laser, “Lasery 100” produced by Nippon Sekigai Kogyo Ltd. was used in this experimental studies.
Opening of the abdominal wall, liver dissection and hemostasis of bleeding from spleen were made using rabbits and mongrel dogs. Amount of missed blood from dissected liver and cut margin of the abdominal wall was reduced compared with steel scalpel and electrocautery.
Hemostatic effect of the “Lasery 100” for bleeding spleen was well demonstrated.
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Daijiro Tsujimura, Peter Kiefhaber
1980 Volume 1 Issue 1 Pages
378-383
Published: 1980
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We explained the instruments of endoscopic high power Nd-YAG laser coagulation for acute gastro-intestinal bleedings and reported its clinical results at the University of Munich.
In 618 of 663 cases (93.2%) bleeding was successfully arrested with high power (more than 70w) short pulse (0.5-1.0 sec.) Nd-YAG laser by the end of December 1979.
perforation after laser coagulation was noted in 1.3% (8/618). In four cases, however, perforation resulted from low laser power (less than 50W) due to defective laser instruments or light guides. The remaining patients were those with deeply penetrating ulcers or severe coagulopathy.
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H. Suzuki, M. Kawamura, T. Sakaeda, M. Koyama, T. Nagata, Y. Morikawa, ...
1980 Volume 1 Issue 1 Pages
384-392
Published: 1980
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Endoscopic LASER therapy has been clinically used as a therapeutic approach to upper gastrointestinal bleeding since 1975, especially in West Germany. The author (Suzuki) was invited by Marburg University in Germany in 1979 and experienced the endoscopic LASER therapy in 16 cases. A Nd-YAG LASER system (MEDILAS) was installed in our department in March 1980 and we have practiced the endoscopic LASER therapy in 16 emergency cases. We at first made a thin (12.6mm diameter) LASER endoscope (forward view) with the help of Olympus. Endoscopic LASER therapy was found to be effective to stop bleeding for more than 72 hours except a case of esophageal bleeding.
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Yoshiaki Ito, Hiroshi Sugiura, Kenji Tanehiro, Tatsuzo Kasugai, Kenro ...
1980 Volume 1 Issue 1 Pages
393-399
Published: 1980
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The coagulative efficacy and antitumor effect of Nd:YAG laser were investigated.
In experimental bleeding gastric ulcers, we have shown that gas-jet-assisted photocoagulation increased the efficacy in stopping bleeding. All ulcers treated without gas-jet at both 40w and 60w of power continued slow oozing of blood. At 60w of power, gas-jet laser proved 100% effective in complete hemostasis with an average of 5.5 1sec-exposure. Complete hemostasis was achieved in 83% of ulcers treated at 40w of power.
YAG laser treatment was attempted in three patients with II a type early gastric cancer and/or protruded type of borderline lesion of the stomach. The laser application with multiple 1 sec exposures at 40w of power was sufficient to eradicate the lesions in these cases. The effect of laser irradiation was examined histologically in two cases. The remaining case has been under observation of recurrence of the lesions.
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-2nd report.-
K. Mizushima, K. Harada, M. Namiki, S. Kasai, M. Mito
1980 Volume 1 Issue 1 Pages
400-402
Published: 1980
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The YAG laser in clinical usuage as coagulator besides, it ha been used to treat the early stage stomach cancer of protruded type and gastric polyp. The results were as follow:
(1) In the early stage of protruded type stomach cancer, there were 4 cases of I type and 1 case of IIa type treated by laser. The tumors in these 5 cases disappeared after the treatment. There was no evidence of relapses in the course of follow-up in 5 cases, and one case was followed-up in 2 years and 3 months. All were well.
(2) The use of laser is thought to be simple and safety in treating the complicated cases of the protruded type stomach cancer which are not oepradle.
(3) There were 6 cases of gastric polyp of Yamada II type treated by laser in which I think the method by the electricdissector is quite difficult. The results were that the polyp in the 6 cases were all disappeared by using the laser.
(4) There was also a case of polyposis treated by laser and result was good.
(5) The use of laser in treating the gastric polyp is wide in definition
In the course of polypectomy, laser is useful should there be bleeding. It is also simple, safety and useful in treating the polyp of sessile type.
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Masane SUZUKI, Motonori KANAYA, Masayuki NAKATA
1980 Volume 1 Issue 1 Pages
402-405
Published: 1980
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Experimental result of endoscopic holography is doscissed. The wall of the stomach of pig is illuminated by a step type single fiber which is passed through the biopsy channel of endoscope.
Double exposure hologram is made and local deformation of a part coagulated by YAG laser is detected.
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Hiroaki Kumagai, Isao Kawakita, Akira Nakahara, Hiroshi Muto, Hisayuki ...
1980 Volume 1 Issue 1 Pages
406-413
Published: 1980
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We developed the bio-sensor connecting the fiber with spectro-photometer. With this sensor, we tried spectrophotometric scanning of gastric mucosa in vivo. With these characteristic curves as a grand truth, we photographed the gastric mucosa with several sources of light and displayed as pseudo color images by the image analyzer and then compared these patterns. As a source of light, using several filters and laser, in the former case, there was little significant difference, but in the latter case, there was a remarkable difference.
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Masami Ueno, Atsushi Fujie, Haruo Hijikata, Toshio Okada, Minoru Kawag ...
1980 Volume 1 Issue 1 Pages
414-423
Published: 1980
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Toshiro Konishi, Masaru Iwasaki, Mitsuru Sasako, Nobuo Murata, Yuji Ma ...
1980 Volume 1 Issue 1 Pages
424-429
Published: 1980
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Investigations were made on the hemostatic effect of the laser photocoagulation and the electocoagulation on the bleeding of the canine gastric ulcers. In the stomach of the seven mongrel dogs, 57 bleeding ulcers were made by the cuinton ulcer maker. The mean time to stop the bleeding of 21 ulcers by the irradiation of 40 or 50 watt Nd-YAG laser was seven seconds. But the mean time to stop the bleeding of 25 ulcers by the electrocoagulation was 24.3 seconds. The other 11 ulcers were not treated to measure the volume of bleeding without hemostasis. we disclosed from our experiment that with the Nd-YAG laser irradiation, the bleeding from the canine gastric ulcers could stop for the shorter duration than with the electrocoagulation.
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K. Harada, K. Mizushima, M. Namiki, S. Kasai, M. Mito
1980 Volume 1 Issue 1 Pages
430-436
Published: 1980
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In this paper are described the results of fundamental and clinical investigations of controlling bleeding from the digestive tract.
As a fundamental research we were able to check bleeding of the mucosa artificially brought about in a dog when we irradiated laser to it. As there were some cases in which we were unable to control completely bleeding, an output of more than 45 W was considered necessary. The effect of the control of bleeding according to the amount of blood flow and its velocity.
On the basis of the above-mentioned fundamental results we applied them to clinical cases.
In those disease such as stress ulcer, where the blood vessels of the lesion are not exposed, bleeding was controlled with relative case by laser irradiation. We believe it is especially indicated for bleeding from stress ulcer. On the other hand, arterial bleeding of gastric ulcer can be managed at least for the time being, but of hemorrhage could not be expected sufficiently. It was especially difficult to control bleeding from the arteries more than 2 mm in diameter.
We have investigated the hemostatic procedure which combined the photocoagulation by the laseroagulator with the endoscopic local injections of the hypertonic sodiurroepinephrin solution, in order to attain more effective hemostasis on the hemorrhagic lesions of the stomach.
We are testing the quartz fiber which was specifically designed for the usage for the common lateral view-type of endoscopy.
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Experiences of 100 cases
Hirofumi OHASHI
1980 Volume 1 Issue 1 Pages
437-443
Published: 1980
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100 patients with cervical erosion have been treated by the CO
2 laser beam, who complained of laukorrhagia and metrorrhagia but were assured not to have cancer from Nov. 1978 to July 1980.
Using 30/70w defocused beam of the CO
2 surgical laser knife “Medilaser-S-Model MEL 442”, we have performed chiefly freehand operations. In the case of using the defocused beam of low power, it takes lots of time to perform the operation and profuse bleeding and shallow cutting are likely to bring about. But by the defocused beam of high power, it takes a little time and a little bleeding and satisfactorily deep cutting are brought about.
Then we decided on the operation method where we cut the central part, as a cone, at the depth of about 7/8mm and the surrounding part at about 3/4mm of the erosion portion including the surrounding normal tissues, moreover, cut deeper, as a funnel, the central part around the Orificium uteri where erosion was likely to survive.
As the result of the treatment, 92% of the patients were completely cured within 6 weeks after the operation and 8% of them, though erosion partly survived, were completely cured with a freeze technique.
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Takao SHINOZUKA, Masato INOUE, Akikazu FUJII, Nimusakul NARONG
1980 Volume 1 Issue 1 Pages
444-450
Published: 1980
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Recentty, the carbon dioxide laser has been introduced into the gynecologic fields. The use of CO
2 laser is very useful to avoid surgical trauma and to get complete hemostasis from the surgical margin. We have performed the end-to-end anastomosis of the rabbits fallopian tube by means of the CO
2 laser (SHARPLAN 791) in order to evaluate its application in tubal microsurgery and to study the healing process and the effect on subsequent functions of the oviduct.
The CO
2 laser is very useful for microsurgical tubal anastomosis. Complete hemostasis can be obtained and cut end of the tube is remarkably undisturbed. To compare with 200mm and 50mm focal lenses, the former tends to cause wider tissue destruction and more epithelial changes than the latter. But, cutting of the tube using 50mm and 200mm lenses give similar pregnancy rate(50nm: 83.3%, 200mm: 91.6%).
To evaluate from these resuts, the 50mm lens is preferable for tubal anastomosis to minimize thermal damage caused by CO
2 laser beam and to prevent the bleeding from the cut end of the tube.
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Michitaka Wada, Toyomi Fujino, Eiji Ito, Toshio Terashima, Toshio Ohsh ...
1980 Volume 1 Issue 1 Pages
451-456
Published: 1980
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The argon laser method has now been established as one of effective treatment of hemangioma simplex.
We examined the histochemical changes in the hemangioma simplex after the exposure of laser.
Six months later after the exposure, these areas were observed decrease of vascular structures and elastic fibers, but increase of collagen fibers in the upper dermis.
There is histochemical changes signified the region by the laser was completely cured in the scar. It was concluded from these observations that the argon laser was an effect procedure in the treatment of the hemangioma simplex.
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Shigehiko Suzuki, Hisao Koyama, Takahiko Moriguchi, Kunio Inoue
1980 Volume 1 Issue 1 Pages
457-460
Published: 1980
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We experienced argon laser therapy for 115 cases of port-wine stains.
Excellent results were obtained in 24 cases, good results in 63 cases and fair results in 28 cases.
We discussed the relations between the results and some factors: the sex and the age of the patients, and the location and the histological types of the lesions.
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S. Ohmori, C.K. Huang, H. Takada, S. Abe, Y. Fujii, H. Nakanishi, H. F ...
1980 Volume 1 Issue 1 Pages
461-466
Published: 1980
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Argon laser was effective in treating some but not for all portwine stain.
According to the histologic examination portwine stain are classified in four groups. 18% in 1264 portwine stain belongs to constricted type, 25% to intermediate type, 29% to dilated type and 5% to deeply located type.
During past 6 years, 1264 cases (1348 sites) of portwine stain were treated with Argon laser and constricted type responded well in 48%, intermediate type in 55%, dilated type in 79% and deeply located type with partial effectiveness.
Recently, a spectrophotocolorimeter, CMS-1000, was introduced to estimate the effectiveness of Argon laser to portwine stain before the treatment. So far, 2 elements were used in the measurement. R
515 represents the spectro-reflectance of portwine stain to Argon laser, d
515 represents the difference of spectro-reflectances between portwine stain lesion and normal skin.
The smaller the R
515 or the larger the d
515 the better the result by Argon laser can be expected.
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-Part I. effective irradiation to the face-
Noboru TAMURA, Michiaki HIRAMOTO, Yoshinobu TANAKA, Hisaaki YAMAMOTO
1980 Volume 1 Issue 1 Pages
467-474
Published: 1980
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Recently Argon LASER treatment for Hemangioma simplex is noticed. But one of the worst faults is that the diameter of LASER beam is too short to irradiate the wide area of the skin. So we developed well performed X-Y table controller for the use of Argon LASER irradiation. This paper describes the differences of the received energy when the curved surface such the face is irradiated by X-Y table controller which moves on the same level. The results show no differences between by hand and by X-Y table controller except for the irradiation to the nose, eyelids and lips.
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Toshiaki Matsumoto, Takehiko Ohura, Hidehiko Minakawa
1980 Volume 1 Issue 1 Pages
475-481
Published: 1980
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The Spectra-Physics Model 770 Argon Laser Photocoagulator was used to treat 30 patients with port wine stains. We have tried to enlarge the diameter of laser beam to prevent post irradiated reticular patterns and to manipulate easily. We found that the beam diameter was able to be dilated to 4 mm, at 5 watts with pulse duration of 0.2 seconds. On this condition, It is relatively rare to get post irradiated reticular patterns and it is easy to operate the Manipulator, as compared with results on the usual condition that is 1.8 watts at a spot size of 2 mm with a pulse duration of 0.2 seconds.
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Shuso Kotaki, Yasuhiko Onoe, Takefumi Okada, Eiji Itoh, Yu Maruyama, N ...
1980 Volume 1 Issue 1 Pages
482-485
Published: 1980
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The use of the argon laser in the treatment of hypertrophic scarring and “true” keloids is discussed. We report on three cases as examples of the treatment method and results. A possible theoretical explanation is offered that the absorption of the laser beam caused a thermochemical reaction followed by photochemical and photoenzymatic reactions, which inhibited the synthesis of immature collagen fibre. Pressure therapy used in conjunction with the laser was found effective, but steroids were contraindicated.
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MASAMI TERAUCHI, KIYOSHI TODA
1980 Volume 1 Issue 1 Pages
486-496
Published: 1980
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Many studies about the application of the laser to skin surface have been performed. The purpose of our study was to evaluate the effect of the Nd-YAG laser on the skin, especially epidermis.
The output power of Nd-YAG laser was 4W, 10W and 50W. Irradiation time period was 1.0 sec,. Macroscopically, the change were minimal at the power 4W and 10W, but at the 50W, that was severe and just like a crater. Microscopically, severe damage was produced at the basal layer on which melanin pigment was located. It was considered that the separation of basal lamina was related to the release of enzymatic junction which was caused by the thermal absorption in melanin pigment.
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Kazuhiko Hirokami, Yukihiro Bandoh, Ichiro Tange, Hideto Ohtsuka, Akir ...
1980 Volume 1 Issue 1 Pages
497-500
Published: 1980
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Many reports have referred to the treatment of nevi and skin diseases with CO
2 LASER. We have treated nevi and skin diseases by abrasion with defocused CO
2 LASER beam. This method seems better than other abrasions with less bleeding, shorter operating time, and more even abrasion of wide area. But sometimes hypertrophic scars became a problem. In order to solve this problem, we injected normal saline or other liquids into dermis and abrased, using “Banding technic of Apfelberg”. By this technic we treated several cases of pigmented nevi, hemangioms and skin tumors, and had good results.
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Toshio Ohshiro, Shuso Kotaki, Yasuhiko Onoe, Takefumi Okada, Narong Ni ...
1980 Volume 1 Issue 1 Pages
501-510
Published: 1980
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The literature contains many references to the use of the laser in the various medical fields. On the other hand, references to a precise and consistent means of arriving at the correct dosimetry to achieve unvaryingly good treatment results, are lacking. After 5 years experience in which over 4,000 patients had been treated using laser, a factor was discovered which could be used to give consistently good results. The factor consisted of the product of the treatment dose and the irradiated area, with all other factors being taken into consideration, especially the crucial maximum reepithelisation period of 14 days: We refer to this as the intact factor, and by applying it on a patient by patient basis, the laser surgeon can achieve consistent and satisfactory results.
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Kozi Morooka, Satoru Yamada, Kenzo Yamada, Narong Nimsakul, Mitsuhiro ...
1980 Volume 1 Issue 1 Pages
511-514
Published: 1980
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As permission for use from the Ministry of welfare was officially granted early this year, the use of Laser scalpel has been increasing greatly in number, and the need for establishing the training system is urgently required.
We have designed the training system for the proper and safe use of laser scalpel, with emphasis on restriction of time and number of training staffs. The system is separated into OJT (on the job training) with on-spot training, and OFFJT (off the job training) with training away from the practice, but both the OJT and OFFJT should be simultaneously executed. So, in order to raise-up the effectiveness of OJT while taking the OFFJT course, we have designed the training program using the teaching aids, and programming textbooks based on Learning Theory.
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I. Thermal damage against liver microvasculature
R. Tanino, M. Nishimura, M. Miyasaka, H. Yamaguchi, I. Nakajima, T. Mo ...
1980 Volume 1 Issue 1 Pages
517
Published: 1980
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The most useful advantage of CO
2 Laser scalpel is its hemostatic effect which may enable the dry field operation, therefore, comparison with electroscalpel is quite interesting, while their adverse effect of thermal damage against surrounding tissues cannot be ignored.
We performed the comparative study of thermal damage of rat liver minovasculature after cutting with these two instruments by means of total replacement of blood with India ink.
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Shingo Wakamatsu, Yoshiko Imamura, Masahito Amaha, Kenji Sasaki, Motoh ...
1980 Volume 1 Issue 1 Pages
518
Published: 1980
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Yutaka Inaba, Tsukasa Fujimoto, Keiji Nishimoto, [in Japanese], Toshio ...
1980 Volume 1 Issue 1 Pages
519
Published: 1980
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AKIRA NAKAHARA, YASUHIRO TAKASE, KEIJI TSUKADA, KAZUO ORII, ISAO KAWAK ...
1980 Volume 1 Issue 1 Pages
520-521
Published: 1980
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Naoki Tsukamoto
1980 Volume 1 Issue 1 Pages
522
Published: 1980
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Forty patients with CIN were treated with CO
2 laser. CIN consists of 14 mild dysplasia, 10 moderate dysplasia, 12 severe dysplasia, and 4 carcinoma in situ. The ages of the patients ranged from 26 to 50 years. CO
2 Surgical Laser, System 400, was used, and most of laser therapy was administered with continuous, defocused beam under 25 watts power. The periods of follow up were from 3 to 22 months, 29 patients followed more than 6 months. All of the patients are in remission at present. Three out of 14 mild dysplasia and 1 out of 12 severe dysplasia needed the second treatment because of persistence. All persistent diseases were found within 7 weeks after the initial treatment. These patients were treated with lower power in the earlier period of this study. All the patients were treated at the outpatient without anesthesia. The patients felt mild pains and/or heat sensation in the lower abdomen, but none of them needed analgesia. CO
2 laser seems to be an effective armamentarium for the treatment of CIN.
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Kazuo Shimodaira
1980 Volume 1 Issue 1 Pages
523
Published: 1980
Released on J-STAGE: September 24, 2012
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Shingo Wakamatsu, Yoshiko Imamura, Masahito Amaha, Kenji Sakaki, Motoh ...
1980 Volume 1 Issue 1 Pages
524
Published: 1980
Released on J-STAGE: September 24, 2012
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Narong Nimsakul, D. Nimsakul, R. Santiago, I. Nakajima, T. Morita, M. ...
1980 Volume 1 Issue 1 Pages
525
Published: 1980
Released on J-STAGE: September 24, 2012
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The concept of combined Laser Therapy (C. L. T.) was primarily reported by Nimsakul N. and Ohshiro in 1979 at the 3rd Congress of International Society for Laser Surgery, and since then many cases have been done clinically with satisfactorily results.
Laser machines in use are CO
2, Argon, Ruby and Nd-YAG. Classification and indication of use in various procedures are presented, and further improvement on both soft-ware and hard-ware and discussed.
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Uichi KUBO
1980 Volume 1 Issue 1 Pages
529-531
Published: 1980
Released on J-STAGE: September 24, 2012
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[in Japanese]
1980 Volume 1 Issue 1 Pages
532-533
Published: 1980
Released on J-STAGE: September 24, 2012
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Toshio Ohshiro
1980 Volume 1 Issue 1 Pages
534-538
Published: 1980
Released on J-STAGE: September 24, 2012
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Kiyoo Kamikawa
1980 Volume 1 Issue 1 Pages
539-540
Published: 1980
Released on J-STAGE: September 24, 2012
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Shigemi Ariyama, Tadayoshi Takemoto
1980 Volume 1 Issue 1 Pages
541-545
Published: 1980
Released on J-STAGE: September 24, 2012
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Since introduction of Argon ion laser coagulator in the field of endoscopy, great advances were seen in stopping gastroduodenal bleeding. We used Argon laser for basic and clinical studies.
The Argon laser generator is Spectra Physics Model 770, which has maximum 10w output power. The laser beams are transmitted by the quartz fiber which is enveloped by the Teflon tube. This Teflon tube can be passed through the biopsy channel of the endoscopes. The carbon dioxide gas jet is passed through the lumen between the Teflon tube and quartz fiber. Two types of new endoscopes were developed recently,
The effect of Argon laser irradiation on the gastric mucosae of heparinized mongrel dogs was investigated in the first place. Argon laser caused whitish degeneration on the gastric mucosae under energy density over 20 J/cm
2. From the results of our basic study, it showed that Argon laser irradiation had only a few risk of perforation.
Secondly Argon laser treatment was done in four cases of gastric ulcer, three cases of duodenal ulcer, two cases of gastric polyp, a case of gastric submucosal tumor, and a case of esophageal varices.
These present studies suggest that Argon laser irradiation is effective to stopping the gastroduodenal bleeding and polypectomy.
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Narong Nimsakul
1980 Volume 1 Issue 1 Pages
546-549
Published: 1980
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Joseph H. Bellina
1980 Volume 1 Issue 1 Pages
551
Published: 1980
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The Carbon Dioxide Laser. In the hands of an experienced colposcopist trained in the biophysics and gynecologic applications of lasers. Can vaporize and excise diseased tissue with a precision heretofore unavailable. It has proven effective in the treatment of cervical intraepithelial neoplasia. While preserving reproductive integrity. Additionally, it is a valuable implement in fallopian tube microsurgery for infertility, being superior to conventional microsurgery in the ease of maintaining hemostasis, surgical precision, and minimizing tissue trauma. The role of the laser in gynecology, covering its efficacy in the treatment of CIN and its application in the treatment of infertility by microsurgery will be the main topics of discussion.
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Rodney Perkins
1980 Volume 1 Issue 1 Pages
552-555
Published: 1980
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This Presentation will review basic Argon Laser physics and the interaction of lasers with tissue,clinical applications in otology and neurotology will be discussed. Special equipment characteristics and surgical techniques will be reviewed in detail.
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Comparative study of the effects of Argon and Neodymium Yag lasers beams on the fundal wall in the Beagle dog.
J. ETIENNE, N. DORME, A. LADOUCH-BADRE, P. RAIMBERT, J.P. BERTHIER, R. ...
1980 Volume 1 Issue 1 Pages
556-559
Published: 1980
Released on J-STAGE: September 24, 2012
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96 laser impacts and 141 mechanically induced haemorrhagic ulcers of the gastric fundal wall were studied in the Beagle dog. The degree of penetration, the efficiency of the photocoagulation and the rate of healing as compared with untreated lesions were studied in each dog. The number of the complete haemostasis was significantly higher with the Nd-Yag. These experimental results led us to choose the Nd-Yag laser for use in human digestive endoscopy. 48 patients were treated. Photocoagulation was tried in 13 cases and was shown to be effective in all cases of angioma. Volatilization was studied in 35 cases, mostly with benign tumorous lesions, and was shown to be very satisfactory.
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A. Hofstetter
1980 Volume 1 Issue 1 Pages
560-588
Published: 1980
Released on J-STAGE: September 24, 2012
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