Abstract: A laser device includes first and second laser transmitting passages. The first laser transmitting passage in the form of tube has an interior opened at its first and second ends. The second laser transmitting passage has first and second ends. The first end of the second laser transmitting passage is spaced away from but optically connected with the second end of the first laser transmitting passage. This allows that laser transmitted through the first laser transmitting passage is guided into the second laser transmitting passage. Air, on the other hand, is transmitted through the first laser transmitting passage to impinge on the first end of the second laser transmitting passage for cooling.

Abstract: A medical laser treatment device comprises a handpiece having a handpiece body and a laser probe to be attached to the handpiece body, a laser light source, and a light transmission member which guides laser light to the handpiece. The laser probe has a fiber probe having an emission face through which the laser light is emitted to an irradiation region, an annular protection tube which covers the peripheral face of the fiber probe, and a holder which holds the fiber probe and the protection tube. The protection tube has a curved part extending with being curved. A first fiber curved part is formed in the fiber probe by passing the fiber probe through the protection tube. A second fiber curved part having a radius of curvature is smaller than that of the first fiber curved part is disposed in a tip end portion of a fiber probe.

Abstract: In a laser surgical unit having a contact laser probe (1), a hydroxyl group (13) is included in the contact laser probe so that a laser beam is partially absorbed by the hydroxyl group (13) to heat the contact laser probe (1) for transmission to living tissue. Consequently, a coagulation layer is formed in the living tissue along with vaporization and incision. At least a part of the contact laser probe (1) is made of a material which contains the hydroxyl group (13) generally in an amount of between 0.5 and 10 ppm. Alternatively, the hydroxyl group (13) may be included only in a portion adjacent to a surface of a tip portion of the probe (1). As a further alternative, a coating film containing the hydroxyl group (13) may be attached to the tip of the contact laser probe (1). The laser beam preferably has a wavelength between 1.5 and 15 .mu.m. For example, use is made of an Er:YAG laser beam a Ho:YAG laser beam, or a CO.sub.2 laser beam.

Abstract: A medical laser treatment device comprising a laser generation source and a laser handpiece which comprises a light-guiding fiber used to guide a laser beam irradiated from the laser generation source, a probe for guiding the laser beam having been guided by the fiber to an object to be irradiated, at least two independent air supply passages and at least one water supply passage, the laser handpiece being adapted such that the emission end of the light-guiding fiber is airtightly isolated from the incident end of the probe via a light-guiding shield plate to make the internal section of the light-guiding fiber airtight, to cool the emission end of the light-guiding fiber using dry gas supplied from the first air supply passage and to cool the incident end of the probe using gas supplied from the second air supply passage, and being also arranged such that water supplied from the water supply passage is blown out from the peripheral section of the leading end of the probe, thereby preventing the emission end

Abstract: In a laser surgical unit having a contact laser probe (1), a hydroxyl group (13) is included in the contact laser probe so that a laser beam is partially absorbed by the hydroxyl group (13) to heat the contact laser probe (1) for transmission to living tissue. Consequently, a coagulation layer is formed in the living tissue along with vaporization and incision. At least a part of the contact laser probe (1) is made of a material which contains the hydroxyl group (13) generally in an amount of between 0.5 and 10 ppm. Alternatively, the hydroxyl group (13) may be included only in a portion adjacent to a surface of a tip portion of the probe (1). As a further alternative, a coating film containing the hydroxyl group (13) may be attached to the tip of the contact laser probe (1). The laser beam preferably has a wavelength between 1.5 and 15 .mu.m. For example, use is made of an Er:YAG laser beam, a Ho:YAG laser beam, or a CO.sub.2 laser beam.

Abstract: A laser treatment device provided with a laser light source, a laser-light transmitting optical fiber for transmitting laser light output from the laser light source and a probe for guiding the laser light transmitted by the laser-light transmitting optical fiber to an object to be irradiated. Further, the probe is constituted by a laser-light guiding optical fiber separated from the laser-light transmitting optical fiber. Moreover, a cooling chamber for cooling the optical fibers is provided in the neighborhood of an output end of the laser-light transmitting optical fiber, from which the transmitted laser light is output, and an input end of the laser-light guiding optical fiber, from which the laser light output by the laser-light transmitting optical fiber is input to the laser-light guiding optical fiber. Thereby, a medical treatment of a deep part of an affected or diseased region can be achieved without worsening the state of the exit of the laser-light transmitting optical-fiber.

Abstract: A laser irradiation device comprising an optical fiber, a contact probe which irradiates laser light from the irradiation end section thereof, and a holding member which coaxially secures the contact probe and the optical fiber. The device is further characterized in that the irradiation angle of the laser light irradiated from the irradiation end section of the contact probe can be changed while the diameter of the contact probe is standardized, whereby the irradiation angle and diffusion conditions of the laser light can be set and changed as desired to improve the transpiration and coagulation capabilities using a low output laser generation unit, thus reducing the coast of the entire laser irradiation system.

Abstract: A medical laser handpiece comprising a grip body, a semiconductor laser generator disposed in the grip body and an irradiation nozzle which is detachably cross-connected to the head of the grip body at an angle and includes a laser light transmitting means from the semiconductor laser generator. With this laser handpiece, an operator can accurately and easily treat even relatively small and complicated shaped teeth and periodontal sections in the mouth. In addition to a structure capable of irradiating laser lioght and a structure capable of cooling the semiconductor generator, this invention also includes a structure capable of jetting air, water and a mist of air and water, and a structure capable of reducing irradiation loss of laser light.

Abstract: A speed change device arranged such that a driving shaft connecting with a driver and a tool working shaft connected with a driven tool are connected with each other for transmission of torque in the no speed change mode or in the speed change (acceleration or deceleration mode and wherein a manipulating sleeve on the outer periphery of the handpiece case is used for selecting either the no speed change or the speed change mode thereby saving the expense of providing alternative devices for the individual modes of torque transmission.

Abstract: This invention relates to a face bow for a mandibular motion diagnostic device and more particularly to a face bow as a component of a device for measuring a patient's mandibular motion and reproducing it precisely by the use of a mandibular model on the basis of the measured data. The face bow is attached in a fixed positional relationship to the patient's mandible as measurement is taken of the motion thereof and is shifted onto the mandibular model upon completion of the measurement so that the patient's dental arch in its actual position is precisely reproduced in the mandibular model.

Abstract: A mandibular motion reproducing device wherein a mandibular model supporting plate on which a mandibular model is fixed is deemed as a rigid plane, three points contained in this rigid plane are selected and marked, three reference points for reproduction are set each corresponding to one of the marked points and in a predetermined dimensional relationship therewith, drive means capable of shifting the individual reference points for reproduction along the coordinate axes of X, Y, Z respectively are connected therewith, the drive means have six alternative driving directions including the orthogonal X, Y and Z directions and are individually driven by inputting position coordinate information obtained from a measuring system and the resulting motions of the reference points for reproduction are synthesized for causing the rigid plate constituting the mandibular model supporting plate to undergo three-dimensional motion.

Abstract: A dental diagnostic device is disclosed, wherein the mandibular motion is created as that which results from synthesis of three-dimensional motions of three points to be measured. It is converted into movement of three reference points for reproduction corresponding to the individual points to be measured and the motion resulting from synthesis of the three-dimensional motions at the respective reference points for reproduction is reproduced in or by the use of the mandibular model. Hence no approximate computing processing or the like is needed, there is no room for errors except those in the measuring and reproducing systems and theoretically it is possible to reproduce with a high precision the patient's mandibular motion by the use of a three-dimensional model of the mandible.

Abstract: A chuck device for a dental handpiece comprising fixedly mounting a front collar inside a rotor at the end thereof for the dental handpiece and threadedly and detachably fixing a cartridge chuck behind said front collar inside of said rotor, said cartridge chuck comprising a substantially cylindrical chuck case provided at the rear end with an engagement portion for detachably connecting a cutting tool thereto, a synthetic rubber chuck body press inserted into the end side of said case, and a rear collar fixedly mounted behind said chuck body inside said case.

Abstract: A dental hand-piece with an air turbine wherein a collet chuck holding a cutting tool spindle, a clamping member enough to clamp tapered chuck pawls of the collet chuck convergently from the outside, and further a moving element allowed to do the fine movement toward the outside owing to the centrifugal force acting thereon during the rotation of a rotary body are all together incorporated into the turbine rotary body supported by a shaft bearing inside a head casing, and which hand-piece is so designed in such manner that the fine movement of the moving element can provoke the sliding movement tending to clamp the chuck pawls between the collet chuck and the clamping member, is disclosed. In this hand-piece, the chuck pawls are automatically clamped at the time when the turbine rotary body starts to rotate, and the holding force of the collet chuck becomes greater to perform the reliable and steady holding of the cutting tool spindle the more high-speedily the rotary body rotates.

Abstract: A bearing for an air driven turbine operated dental handpiece of the type including a turbine rotor provided in a casing and having blade elements coupled to a shaft member. The bearing includes a first air bearing formed circumferentially about the shaft member, a second air bearing including a small gap formed between the end of the shaft and an inside surface of the casing and a means for introducing compressed air into the small gap and a pair of opposed magnets of the same polarity provided respectively in the end of the shaft member and the inside surface of the casing whereby the axial load on the turbine rotor is resisted not only by the second air bearing but also by the magnetic repulsive force of the magnets.