ATTACHMENT FOR LASER DEVICE

Abstract: An attachment device for connecting first and second parts of a laser device comprises a groove in one part, a mating pin in the other and a spring-biased collar for securing the pin the groove.

Description: ATTACHMENT FOR LASER DEVICE BACKGROUND OF THE INVENTION This invention relates to attachments for connecting the components of a laser device such as a laser machining apparatus or a laser knife which can be disassembled into separate components according to their functions. A hand piece unit at the end of. a light conducting path for a laser device such as a laser knife, as shown in Fig. 1, comprises: a hand piece section A; a lens holder section B; and an end adaptor section C. Depending on the kinds of surgical operations to be performed, it is necessary to couple focusing lenses of different focal lengths or end adaptors of different configurations to the laser knife. For this purpose, the hand piece unit is divided into the three components mentioned above, and these components are connected together or interchanged by screwing. However, this screwing system is disadvantageous in that, since each component must be turned at least several turns until it is connected or disconnected, it takes an undesirably long time to exchange the lens holder section B or the end adaptor section C, and accordingly it is impossible to reduce the time required for a surgical operation. SUMBARY OF THE INVENTION Accordingly, an object of this invention is to eliminate the above-described difficulties. More specifically, an object of the invention is to provide an attachment for a laser device, by which the components of the laser device can be readily and quickly connected to and disconnected from each other, and which is simple in construction. The. foregoing object and other objects. other invention have been achieved by the provision of an 'attachment' for a laser device comprising at least two separable. connecting parts, with'an engaging groove being formed in a first one of the connecting parts, the engaging groove consisting of an inserting groove which extends from the connecting end of the first connecting part inwardly of the first connecting part and a locking groove which is extended from the inserting groove towards the connecting end of the first connecting part#. An engaging pin protrudes from a second one of the connecting parts, which is to be connected to the first connecting part, in such a manner that the engaging pin is engaged with the engaging groove of the first connecting part, and a cover incorporating a spring is provided on the first¯or second connecting part, the spring pushing back the first and second connecting parts when they are joined In another attachment provided by the invention for a laser device comprising at.-least two separable connecting parts, an engaging groove is formed in a first one of the connecting parts in such a manner that it opens to the connect ing end of the first connecting part and bends in a circumferen tial direction, and an engaging pin protrudes from a second one of the connecting parts, which is to be connected to the first connecting part, in such a manner that the engaging pin can be engaged with the engaging groove of the first connecting part. A cover having an engaging groove which is extended axially to receive the engaging pin is provided on the first connecting part in such a manner that the cover is movable in'the axial direction, and a spring is provided to push said cover towards the second connecting part. BRIEF DESCRIPTION OF THE DRAWINGS The nature, principle and utility of the invention will become more apparent from the following detailed descrip tion when read in conjunction with the accompanying drawings, in which: Fig. 1 is a front view showing the arrangement of the hand piece unit of a laser knife; Fig. 2 is a longitudinal sectional view showing the connecting arrangement of the hand piece unit of a laser knife which employs-an attachment according to a first embodiment of this invention; Fig. 3 is a perspective view showing the essential components of the attachment; Fig. 4 is a longitudical sectional view showing the connecting arrangement of the lens holder section and the end adaptor section of a laser knife which employs an attachment according to a second embodiment of the invention; and Fig. 5 is a perspective view showing the essential components of the attachment in Fig. 4. DETAILED DESCRIPTION OF THE INVENTION Preferred embodiments of this invention will be described by way of example with reference to attachments used in:the hand piece unit of a laser knife. As described above, a hand piece-unit at the end of the light conducting path of a laser knife comprises a hand piece articulation section A, a lens holder section B, and an end adaptor section C. These connecting parts A, B and C are connected together through attachments formed at the ends thereof. Each attachment comprises: an engaging groove 1; an engaging pin 2 which is engaged with the. engaging groove 1; and a cover 3 used to push back these connecting components. In a first embodiment of the invention shown in'Fig. 2, in order to join the hand piece articulation section A and the lens holder section B together, the hand piec#e articulation section A-has an engaging -pin 2 while the lens holder section B has the engaging groove 1 and the cover; and in brder to join the lens holder section B and the end adaptor section C together, the lens holder section B has an engaging pin 2 and the cover 3' while the end adaptor section C has the engaging groove. It is desirable to provide at least two pairs of engaging grooves 1 and engaging pins 2 so that the axis of the light conducting path is maintained correct. However, one pair of an engaging groove 1 and engaging pin is sufficient if the connecting ends are formed accurately. The engaging groove 1, as shown in Fig. 3, comprises an inserting groove la which extends -from¯the end face of the connecting part inwardly thereof, and a locking groove lb which extends from the inserting groove la outwardly of the connecting part, i.e;, towards the end face of the connecting part, so as to stop the circumferential movement of the engaging pin provided on the mating connecti part. In this embodiment, the inserting groove la of the engaging groove 1 is inclined with respect to the axis of the connecting parts; however, it may instead be extended in parallel with the axis. In other words, all that is necessary for the engaging groove 1 is that the inserting groove la extend from the end face of the connecting part inwardly thereof and the locking groove lb extend from the inserted groove at least slightly in the opposite direction. In the case where the engaging-groove 1 is L-shap#ed, it is necessary to push and turn one of the connecting parts. In the case of the illustrated embodiment, it is not necessary to push, but the engaging pin 2 ¯'an be engaged with the locking groove lb merely by turning the connecting parts relative to each other. The engaging pin 2 is formed on the outer wall of the hand piece articulation section A or the lens holder section B in such a manner that it protrudes radially outwardly thereof. More specifically, the engaging pin 2 is positioned in correspondence to the position of the engaging groove 1 and over the turning point ofthe groove 1. The lens holder section B has a cover 3 which is used to push back the connecting parts which have been joined together by engaging the engaging pin 2 with the engaging groove 1, i.e. it urges the parts in opposite directions to secure-the pin in the groove lb. The cover 3 is so designed that it is not turned and is movedonly in the axial direction by means of a sliding key 5 set in a guide groove 4 which is formedDin the lens holder section B. The cover 3 incorporates a spring 6 so that the mating connecting parts, namely the hand piece articulation section A and the end adaptor section C which have been pushed into one another, are pushed back by the spring. If, after the engaging pin 2 of the hand piece articulation section A has been set in the inserting groove la of the engaging groove 1 of the lens holder section B, the lens holder section B is turned relative to the section A while being pushed in, then the engaging pin 2 will follow the engaging groove 1 while the cover 3 is being pu'shed by the end face of the hand piece articulation section, and finally the engaging pin 2 will be set in the locking groove lb. The hand piece articulation section A and the lens holder section B, while being pushed apart by the action of the cover 3, are positively coupled to each other by the engagement of the engaging pin 2 and the locking groove lb. That is, the sections A and B are positively connected when the engaging pin 2 is pushed to the end of the engaging groove 1. The hand piece articulation section A is disconnected from the lens' holder section B as follows. The hand piece articulation section A is pushed.towards the le'ns holder section B and turned to disengage the engaging pin 2 from the locking groove, and the hand piece articulation section A is then pulled to move the.engaging pin 2 along the inserting groove la. The end adaptor section C is connected to and disconnected from the lens holder section B similarly as in the above-described case. In the above-described embodiment, the engaging pins 2 are provided on the hand piece articulation section A and the end adaptor section'C-; however, the engaging pins 2 may be provided instead on the lens holder section B. Also in the above-described embodiment, the cover 3 is provided on the lens holder section B, but it may obviously be provided on any one of the connecting parts. Furthermore, the connecting pin 2 may be provided on the inner wall of one of the connecting parts instead of the outer wall. A second embodiment of the invention is shown in Figs. 4 and 5. An attachment, as shown in Fig. 4, comprises an engaging groove 1, an engaging pin 2 which is engaged with the engaging groove 1, and a cover 3 for fixing the engaging pin 2. The attachment is used to couple the lens holder section B to the end adaptor section C, for example. The lens holder section B has the engaging groove 1, while the end adaptor section C has the engaging pin 2.. It is desirable that at least two pairs of engaging grooves 1 and engaging pins 2 are provided symmetrically so that the axis of the light conducting path is maintained correct, but one pair may be sufficient if the connecting ends are formed accurately, similarly as in the case of the first embodiment. The engaging groove 1, as shown in Fig. 5, is a bent groove which consists of an inserting groove la which is extended from the inserting groove la circumferentially of the connecting part, to stop'the axial movement of the engaging pin 2. In this embodiment, the inserting groove la extended axially is perpendicular to the locking groove lb extended circumferentially. However, the engaging groove 1 may be so modified that the inserting groove la is inclined with respect to the axis of the lens holder section B, and the lodinggroove'lb is provided at the end of the inserting groove la thus inclined. tn this modification, a force.of pushing the end adaptor section C with the engaging pin 2 into the lens holder section B can be obtained by rotation of the end adaptor section C, and therefore the two sections B and C can be readily connected to each other. The engaging pin 2 is formed on the outer wall of the end adaptor section C in such a manner that it protrudes radially outwardly of the section C. More specifically, the engaging pin 2 is positioned in agreement with the position of the locking groove lb of the engaging groove 1, so that when the pin 2 is set in the locking groove lb, the distance between the'end adaptor section C and the lens holder section B is set to a desired value. The lens holder section B has the cover 3 which is adapted to stop the rotation of the engaging pin 2 set in the locking groove lb, as was described above. The cover 3 is so designed that it is not turned and is movable only in the axial direction by a sliding key 5 which is set in a guide groove 4 which is formed in the lens holder section B. A spring 6 is interposed between the cover 3 and the lens holder section B, so as to push the cover 3 towards the end adaptor section C. The cover 3 has an engaging groove 7 which surrounds the engaging pin 2 of#the end adaptor section C, to prevent the engaging pin 2 from being turned circumferentially of the section C. If, after the engaging pin 2 of the end adaptor section C is set in the inserting groove la of the engaging groove 1 of the lens holder section B, the end adaptor section C is pushed and turned relative to the lens holder section B, the cover 3 pushed by the engaging pin 2 is caused to spring towards the end adaptor section C by the elastic force of the spring 6 when the pin 2 aligns with the engaging groove 7 of the cover.3, as a result of which the engaging pin 2 is surrounded by the engaging groove 7, i.e., it is set in the engaging groove 7. Thus', the engaging pin 2 can move no further in either the-circumferential direction or the..axial'direction; that is, the lens holder section B is fixedly coupled to the end adaptor section C. The lens holder section B can be disconnected from the end adaptor section C as follows. The cover 3 is pulled towards the lens holder section B so that the engaging pin 2 is movable in the circumferential direction. Then, the end adaptor section C is turned relative to the lens holder section B, to move the engaging pin 2 in the circumferential direction, and.then the end adaptor section C is pulled out .to remove the engaging pin 2 from the inserting groove lb. In the above-described embodiment, the engaging pin 2 is provided on the side of the end adaptor section C; however, the attachment may be so modified that the lens hdider section B has the engaging pin 2, while the end adaptor section C has the engaging groove 1 and the cover 3. Furthermore, the . engaging pin 2 may protrude from the inside wall of the connecting part, instead of the outer wall. As is apparent from the above description, in a laser device made up of separable connecting parts according to this invention, one of the connecting parts has an engaging pin, and its mating connecting part has both an engaging groove for preventing the circumferential and axial movements of the engaging pin and a cover. for moving the engaging pin in a direction opposite to the direction in which the engaging pin has been moved in engagement. Therefore, if, after the #ngaging.pin of the one connecting part has been aligned with the engaging groove of the mating connecting part, the two connecting parts are turned relative to each other, then the engaging pin is automatically fixedly-set in the engaging groove or in the end of the locking part thereof. That is, the connecting parts of the laser device can.be connected by one operation wherein they are turned relative to each other while being pushed in. The connecting parts can be also readily disconnected. That is, the disconnection can be achieved by turning one of the connecting parts to move the engaging pin from the locking groove to the '.inserting groove or by turning the connecting parts relative to each other after the cover has been pulled in. Thus, in the case of a laser knife consisting of three separable parts, depending on surgical operation methods or the body parts to be operated on, the lens holder section or the end adaptor section can be readily exchanged, which will contribute to a reduction of:the time required for a surgical operation. The attachment is considerably simple in arrangement because it utilizes the engagement of the pin and the groove.

Claims: WHAT IS CLAIMED IS:- 1. In a laser device having at least first and second parts and attachment means for attaching said first and second parts to one another at mating ends thereof, said attachment means comprising: an engaging groove formed in said first#part, said engaging groove opening to said mating end of said first part; a a pin protruding from said second part and insertable into said engaging groove'; and holding means for holding said pin in said groove. 2. An attachment means as claimed in claim 1, wherein said engaging groove comprises an inserting groove portion opening to said mating end of said'first part and extending in a first direction away from said mating end, and a locking groove portion contiguous with said inserting groove portion and extending in a second direction different from said first direction, said holding means holding said pin in said locking groove portion. 3. An attachment means as .claimed in claim 2, wherein said locking groove portion extends from said inserting groove portion cicumferentially about said first part in a direction substantially perpendicular to a central axis of said first part. 4. An attachment device as claimed in claim 2, wherein said locking groove portion extends from said inserting groove portion in a direction at least slightly toward said mating end of said first part. 5. An attachment means as claimed in claim 3, wherein said holding means comprises a cover member slidably mounted on one of said first and second parts for movement axially with respect ot said frist part and having a groove therein for receiving said pin and preventing movement of said pin in a circumferential direction of said first part. 6. An attachment means as claimed in claim 5, wherein said cover means is spring biased toward said mating end of said'first part. 7. An attachment means as claimed in claim 6, wherein said cover means is mounted on said-first part.# 8. An attachment means as claimed in claim 4, wherein said holding means comprises a slidable member slidably mounted on one of said first and second parts for movement in an axial direction with respect ot said first part and biased toward said mating end of said first part to urge said first and second parts away from one another. 9. An at#tachment means as claimed in claim 4, wherein said slidable member is mounted on said first part and urges. said pin toward said mating end of said first part.

Inventors: OKA, HIDEKAZU SUMITOMO ELECTRIC IND., LTD., ONO, KIMIZO SUMITOMO ELECTRIC IND., LTD., SATO, KOJI SUMITOMO ELECTRIC IND., LTD., SUNAGO, KATSUYOSHI SUMITOMO ELECTRIC IND., LTD., TAKENAKA, SHINYA SUMITOMO ELECTRIC IND., LTD.
Applicants: SUMITOMO ELECTRIC INDUSTRIES LIMITED
Application year: 1981
Main classification: A61B17
IPC codes: A61B18