HAND PIECE FOR USE WITH SURGICAL LASER KNIFE DEVICE

Abstract: A hand piece for use with a laser knife device utilizing an optical fibre as an optical waveguide, comprising a semiflexi­ ble or movable tube adapted to receive an end portion of the optical fibre so that an end of the optical fibre is held at around an end of said tube and a holder portion adapted to receive the optical fibre and having one end connected to the other end of said tube.

Description: Hand piece for use with surgical laser knife device Field of the invention The present invention relates to a hand piece adapted to fixedly support an optional fibre as a waveguide for laser beam for a surgical laser knife device. In using a laser knife device, it is important to direct laser beam exactly to a point to be surgically operated by an operator. In order to achieve this requirement, a hand piece has been used. An example of the conventional hand piece for this purpose is shown in Fig. 1, in which the hand piece is a mere end portion of the optical fibre 1 having a coating2. For the hand piece such as shown in Fig. 1, it is dangerous to hold the end portion of the optical fibre by-hand and, even if the end portion is held by hand , it is very difficult to keep the direction of laser beam from the end of the optical fibre 1, which is relatively flexible, stably. Another example of the conventional hand piece is shown in Fig. 2 in which the hand piece is composed of a nozzle type tube 3 fitted on the end portion of the optical fibre 1 and a lens 4 supported by an end portion of the tube 3 for converging laser beam. With this hand piece, the direction of laser beam is limited to an axis of the tube 3. Therefore; since the focus point is hidden by the hand piece itself it may be difficult to exactly irradiate a point in a limited space with laser beam or it may be difficult for the operator to direct laser beÅam to such point while directly looking at the latter point. Summary of the invention An object of the present invention is to provede a hand piece for a laser knife device by which it is possible to direct laser beam exactly to a point under any space conditions. The above object is achieved, according to the present invention, by a hand piece composed of a holder portion in the form of a hollow tube and an irradiating portion which is prepared separately from and connected to one end of the holder portion. The irradiating portion takes in the form of a semiflexible pipe or movable pipe into which an end portion of an optical fibre passed through the holder portion is inserted. Brief description of the Drawing Figs. 1 and 2 are cross sections of the conventional hand pieces for laser knife device, respectively; Fig. 3 is a cross section of one embodiment of the present invention; Figs. 4 and 5 are modifications of configulation of the irradiating portion, respectively; Fig. 6 is a cross section of the holder portion of the hand piece, showing a cooling passage formed in a holder portion of the hand piece for cooling the latter heated due to heat generated upon laser beam emission through the optical fibre; and Fig. 7 is a side view of another embodiment of the present invention. Detailed Description of the Preferred Embodiments In Fig. 3 which shows one embodiment of the present invention in cross section, a hand piece is composed of a holder 3 formed with a through-hole whose diameter is slightly larger than that of the optical fibre 1 so that the latter can be inserted there through and an irradiating portion in the form of a bent tube 5. An inner dia meter of the tube 5 corresponds to that of the throughhole of the holder 3 and a rear end of the tube 5 is coaxially connected suitably to a front end of the holder 3 to form a long through-hole extending throughout the hand piece. A converging lens 4 is provided at a front end of the bent tube 5. An optical fibre 1 is inserted from a rear end opening of the through-hole of the holder 3 into the hand piece with an end of the optical fibre 1 facing to the lens 4 by which laser beam from the end of the optical fibre is converged. An outer surface of the rear end of the holder 3is threaded and a cap member 7 is fitted through an 0 ring on the thread of the rear end of the holder 3 to support the optical fibre disposed in the hand piece tightly. In this case the coating 2 of the optical fibre 1 in at least the bent tube 5 may be removed if necessary. With the use of the detachable cap member 7 as means for fixing a positional relation between the hand piece and the optical. fibre, it is possible to change the hand piece from one configuration to another dependent on specific application thereof. With the hand piece thus constructed, laser beam is supplied from a -CO2 laser, guided by the optical fibre and emitted from the front end opening of the bent tube 3. Since the bent tube 5 is relatively small in dia meter, it does not make an obstacle to the operation sight. Furthermore, since the bent tube 5 is relatively large in length, the distance between the operator's hand holding the holder portion 3 and the laser beam emitting point is large, causing the operator's hand to be safe. Particularly, in the embodiment shown in Fig. 3 the bending of the bent tube 5 is substantial and takes in the form of semicircle, the axial direction of the holder portion 3 makes a substantial right angle to the direction of laser beam and thus it is possible to direct laser beam exactly to a point in a limited and irregularly shaped space. Therefore the hand piece of this embodiment is preferably applied to the fields of dental and/or stomatological surgery which is to be performed in a limited space. The configulation of the bent tube 5 may be arbitrarily selected according to specific application thereof. An example of the bent tube configulation is shown in Fig. 4 in which a front portion of the bent tube 5 is made in parallel to the axis of the holder 3 with a small distance therebetween. Th#refore, the operation point may be observed clearly by the operator, making this hand piece having the parallel bent tube 5 possible to use in the micro surgical operation. Another example shown in Fig. 5 is the bent tube 5 having a long and straight rear portion. and a short front portion bent. This configulation of the bent tube 5 mEy be suitable to use in an operation to a deep portion, such as otorhinolaryngologic operation It has been known that the optical fibre 1 is heated by laser energy and thus the holder 3 is heated thereby. Therefore, it is desired to cool at least the holder 3 so that the operator can continue an operation. Fig. 6 shows another embodiment by which at least the holder 3 is prevented from being heated by the heated optical fibre 1. In Fig. 6, a cooling system for the holder portion 3 is provided. In this embodiment a fluid passage is formed therein. The fluid passage is composed of an incoming passage portion formed in one side of and extending along the holder portion, a return passage portion 6 formed in the other side of and extending along the holder portion and a connecting portion connecting ends of the passages at the end portion of the holder portion 3. A cooling medium is supplied to the incoming passage portion and flows through the connecting portion and the return passage portion. It may be possible to color the end portion of the bent portion 5 black to prevent a possible reflection of laser beam. Fig. 7 shows a further embodiment in which, instead of the bent tube, a movable pipe 10 is used. The movable pipe 10 is pivotably connected to the end of the holder portion 3 by a pin 9. The movable pipe 10 is pivoted around the pin 9 by positively applying a force to change the irradiating direction of laser beam. With this structure, it is possible to flow an assist gas such as air through small gap formed between the outer surface of the optical fibre 2 and an inner wall of the movable#pipel0. The cooling medium passage such as shown in Fig. 6 may also be formed in the holder portion 3 of this embodiment. As mentioned hereinbefore, according to the present invention, the hand piece for the laser knife device is composed of the holder portion and the semiflexible tube or movable pipe. Therefore, it is easy to change the laser beam direction by merely bending the semiflexible tube or merely pivotting the movable pipe. Therefore, the surgical operation can be performed exactly and safely. Furthermore, the holder portion may be cooled and there is no possibility of leakage of laser beam outside the hand piece even if the portion of the optical fibre within the semiflexible tube or the movable pipe is damaged, because laser light leaked from the damaged fibre may be reflected by the inner wall of the tube or pipe.

Claims: Claims: 1. A hand piece for use with a laser knife device utiliz ing an optical fibre as an optical waveguide, com prising a semiflexible or movable tube adapted to re ceive an end portion of the optical fibre so that an end of the optical fibre is held at ardund an end of said tube and a holder portion adapted to receive the optical fibre and having one end connected to the other end of said tube. 2. A hand piece as claimed in claim 1, wherein said holder portion is formed therein with a cooling medium passage for cooling said holder portion. 3. A hand piece as claimed in Claim 1 or 2, wherein the laser is a C02 laser. 4. A hand piece as claimed in claim 1, 2 or 3, wherein said holder portion has the other end threaded and includes a cap adapted to be screwed through an 0 ring onto said the other end to thereby fixen the optical fibre therein. 5. A hand piece as claimed in any of the preceding claims, wherein said tube is bent or pivotted to make a direction of laser beam emission different from an axis of said holder portion.

Inventors: KATSUYOSHI, SUNATO C/O SUMITOMO ELECTRIC IND. LTD., KAZUHITO, MURAKAMI C/O SUMITOMO ELECTRIC IND. LTD., KENICHI, TAKAHASHI C/O SUMITOMO ELECTRIC IND. LTD., SHINYA, TAKENAKA C/O SUMITOMO ELECTRIC IND. LTD.
Applicants: SUMITOMO ELECTRIC INDUSTRIES LIMITED
Application year: 1982
Main classification: A61B17
IPC codes: A61B18, A61C1