ENDOSCOPE WITH REMOVABLE EYEPIECE

Abstract: A sterlizable endoscope of micro-thin diameter (C) has a central coherent fibre bundle for carrying an image to a viewing means (E), this bundle being surrounded by other light fibres for illumination. The proximate end of the endoscope is provided with a coupling means (14) for aligning the coherent optical bundle with the optical system of the viewing means (E) and for providing an interface with light transmitting means to transmit light from a light source to the body cavity. The coupling means (14) has a diameter no bigger than the diameter of the outer covering of the endoscope. When the endoscope is used in a trochar, the trochar can be removed while the endoscope remains in place. This is accomplished by removing the viewing means (E) and sliding the trochar over the endoscope and then replacing the viewing means (C) for further viewing within the body cavity. The endoscope may be provided in various sizes, each having coupling means (14) for reception in any one of a plurality of sockets in a video monitor which are sized to receive the various endoscopes in order to provide an image to the video monitor screen.

Description: Technical Field This invention relates to endoscopes and more particularly to a micro-thin endoscope having a coupling means on the proximal end for releasable attachment either to an eyepiece for direct viewing by the surgeon or to a console for viewing on a video screen or monitor. Background Art Prior to this invention, light beams have been used both for illumination and for treatment of disease in patients. However, most of the instruments used have not been of sufficiently small size that they can be passed through the various canals and openings of the body without discomfort to the patient. In some cases surgical procedures are required for introducing the instrument to the desired location within a body cavity. U.S. Patent No. 3,858,577 to Bass, et al. discloses an endoscope of substantial size for performing laser surgery. In this device, a conventional light is used through fiber optics to illuminate the operating site and laser light is used to perform a surgical procedure. U.S. Patent No. 4,011,403 to Epstein, et al. discloses a fibre optic laser endoscope. The device utilizes a laser beam as a light source and an optical fibre as a light transmitter. The sensing means includes a TV camera located at the investigated site. The laser beam produces three different wavelengths which produce white light. Also ultraviolet or infrared light can be used. The camera is separate from the fibre optics and the laser. U.S. Patent No. 4,313,431 to Frank discloses an endoscope deploying a laser light source with a light conducting fibre. This device is used for irradiating bladder tumours utilizing the laser light beam. Many of the problems identified above have been overcome by the invention set forth in commonly assigned U.S. Patent No. 4,589,404 to Barath, et al. wherein an endoscope, having a micro-thin diameter, is provided having an interface connector at the proximal end thereof for removably plugging into a receptacle in a video monitor. Thus, the endoscope can be separately sterilized and can be easily replaced, should it become damaged. However, if a power interruption should occur or a malfunction cause the monitor not to work properly, the endoscope disclosed in that patent can no longer be used to complete the operation. This necessitates removal and replacement of the endoscope with another one having an integral eyepiece for viewing the body cavity. This requires extra time and inconvenience and is not desirable from the standpoint of the surgeon or the patient. Summary of the Invention According to the invention, there is provided a sterilizable endoscope for viewing and/or treatment within body cavities by nonsurgical or micro-surgical procedures and having a distal end for insertion into a body cavity and a proximal end; a coherent fibre optical bundle having a micro-thin diameter and extending from said distal end to a point adjacent said proximal end and having a planar surface at its proximal end; a tubular inner cover extending over at least a portion of said bundle; a plurality of light transmitting fibres spaced around said inner cover; a tubular outer cover extending over said fibre to hold it in place, said outer cover extending from said distal end to a point spaced from said proximal end; optical lens means at said distal end of said optical bundle to focus an image of a portion of the cavity on said distal end of said optical bundle for transmission through said optical bundle; and a coupling means for removably connecting said endoscope to a viewing means in fixed angular relationship, the coupling means being fixedly attached at said proximal end of said endoscope; the endoscope being characterised in that the coupling means has a diameter no larger than the diameter of said outer covering so that said endoscope can pass completely through a trochar lumen. Brief Description of the Drawings An endoscope embodying the invention will now be described, by way of example only, with reference to the accompanying drawings in which:- Figure 1 is a perspective view of the endoscope showing specific details of its coupling means and eyepiece; Figure 2 is a fragmentary side elevation of the eyepiece shown in Figure 1 and illustrates interconnections within the eyepiece; Figure 3 is a perspective view showing the use of the endoscope with a trochar which is inserted into a body cavity; Figure 4 is a perspective view of a console for use with the endoscope of this invention; and Figure 5 is a cross-section of part of the endoscope. Description of preferred embodiments The endoscope shown in the drawings comprises a micro-thin tube assembly C as shown in Figure 1. This tube assembly includes a tube 10 which is provided at its distal end with a lens 12 and at its proximal end with a coupling means 14. Turning to Figure 5, an enlarged cross section of tube 10 is shown. At the centre of the tube is a coherent fibre optical bundle 16. A tubular inner cover 18 extends around the optical bundle 16 and may be formed of a heat-shrinkable Teflon (Trade Mark) material which extends along the coherent optical bundle from the distal end to the proximal end. Placed around inner covering 18 are a plurality of light-carrying bundles 20 which are made up of individual fibres which do not have to be coherent. These bundles are for transmitting light from a suitable light source to the body cavity. An outer cover 22 extends around the spaced light bundles 20, as shown, and may also be constructed of a heat-shrinkable Teflon (Trade Mark) material which extends from the distal end of tube 10 to a position adjacent coupling means 14. The coupling means 14 is located at the proximal end of outer cover 22 and includes a longitudinal groove 24 for alignment with a mating rib in a viewing means. It can be made of any suitable material, such as anodized aluminium or a machinable grade of plastics such as Bakelite (Trade Mark). One viewing means is eyepiece E shown in Figure 1. It has a socket 26 with a longitudinal rib 28 which is alignable with the groove 24 of coupling means 14. Thus, the coupling means can be slid into the socket as best seen in Figure 2 and held in position by threaded locking nut 30. The proximal ends of coupling means 14 and the fibres are flat and polished so as to come into contiguous face-to-face contact with the optical system 32, which includes a suitable lens for transmitting the light from the coherent fibre bundle to the user's eye which is held against the ocular face 34. The alignment of groove 24 with rib 28 assures that the image being transmitted by the coherent optical bundle 16 is in proper orientation with respect to the optical system 32 of eyepiece E. The optical system 32 also includes light fibres 36 which extend to a fixture 38 to which a suitable light source can be attached for illuminating the body cavity by transmitting light along fibres 36 and light bundles 20. Because coupling means 14 has a diameter no larger than that of outer cover 22, it can be used in a more versatile manner than heretofore possible. Figure 3 discloses a trochar 40 which is illustrated as being inserted through the wall 42 of a body member and into a body cavity 44. The trochar has a first lumen 46 through which the tube assembly C extends into the body cavity 44. A second lumen 48 is provided for any one of a number of purposes, such as for irrigation or treatment within the body cavity 44. As is well known, trochars of this type may have more than two lumens, depending on their intended use. After the procedure is completed through lumen 48, it may be desirable to remove trochar 40 while leaving tube assembly C in place for further viewing. In order to implement this, the eyepiece E is removed by removing locking nut 30 and sliding the coupling means 14 of the tube 10 out of socket 26. Since the coupling means 14 is no bigger in diameter than outer cover 22, the trochar can be slid to the left, as viewed in Figure 3, while leaving tube assembly C in place. After removal of trochar 40, the eyepiece E can be reconnected to the coupling means 14, as previously described. The surgeon can then resume his viewing of the body cavity, as required. Conveniently, the sterilizable endoscope can also be used with a video console V, of the type shown in Figure 4. This console includes a video screen 50, the coupling means 14 of tube assembly C is receivable in a socket 52 which is connected to the video screen 50 by suitable optics 54 which includes a coherent fibre bundle 56 for transmitting the image to video screen 50. A light source 57 is provided and is connected to the operative socket by light cable 58. It is contemplated that tube assemblies of different diameters may be used in this way, for different purposes. Thus, socket 52 can be provided in a disc 59 which is mounted for rotation on the video console V about an axis 60 and is provided with a plurality of other sockets, such as sockets 62, 64 and 66, as shown. The socket corresponding to the size of the tube assembly C can be rotated to be in the position of socket 52, so as to be properly aligned with the optics 54. An important advantage is that when a cable assembly 10 of the tube assembly C becomes damaged and no longer usable, it can be replaced with another one without having to replace a corresponding eyepiece. Furthermore, the endoscope can be made to be moisture-impervious so that it can be easily sterilized for reuse. When used with a console, the sterility of the operating environment can be maintained since the surgeon does not need to put an eyepiece against his face. Furthermore, when the device is used with the video monitor V, should there be a power interruption or should the video monitor malfunction, it is merely necessary to slip the coupling means 14 out of its socket, such as socket 52, and attach a sterilized eyepiece E, which would be provided to the surgeon, so that he can continue with the operation or procedure with minimal interruption. From the foregoing, the advantages of the endoscope described are readily apparent. An endoscope has been provided which has great versatility in that it may be used with either a substantially standard eyepiece or with a video monitor. The tube assemblies can be provided in different sizes when used with a video monitor, which may contain a plurality of sockets for alignment with the optical means of the video monitor for connection with a tube assembly of the selected size. Furthermore, the tube assembly can be used within the lumen of a trochar and, since the eyepiece is removable, the trochar can be removed without removing the tube assembly and then the eyepiece can be replaced for further viewing. Finally, the tube assembly can easily be replaced should it become damaged without replacement of the eyepiece which contains expensive lenses.

Claims: A sterilizable endoscope for viewing and/or treatment within body cavities by nonsurgical or micro-surgical procedures and having a distal end for insertion into a body cavity (44) and a proximal end; a coherent fibre optical bundle (16) having a micro-thin diameter and extending from said distal end to a point adjacent said proximal end and having a planar surface at its proximal end; a tubular inner cover (18) extending over at least a portion of said bundle (16); a plurality of light transmitting fibres spaced around said inner cover; a tubular outer cover (22) extending over said fibre (20) to hold it in place, said outer cover (22) extending from said distal end to a point spaced from said proximal end; optical lens means (12) at said distal end of said optical bundle (16) to focus an image of a portion of the cavity (44) on said distal end of said optical bundle (16) for transmission through said optical bundle (16); and a coupling means (14) for removably connecting said insertable part of the endoscope to a viewing means (E,V) in fixed angular relationship, the coupling means (14) being fixedly attached at said proximal end of said insertable part of the endoscope; the endoscope being characterised in that the coupling means (14) has a diameter no larger than the diameter of said outer covering (22) so that said insertable part of the endoscope can pass completely through a trochar lumen (40). An endoscope as claimed in claim 1, and characterised by alignment means (24,28) to angularly align the optical bundle (16) with said viewing means (E,V). An endoscope as claimed in claim 2, characterised in that said alignment means includes a longitudinal formation (24) extending along said coupling means (14) for mechanical engagement and alignment with a mating longitudinal formation (28) in the viewing means (E,V). An endoscope as claimed in claim 2 or 3 in combination with said viewing means, characterised in that said viewing means includes: a removable eyepiece (E) having a socket (26) for slidably receiving said coupling means (14) in aligned relationship for viewing. An endoscope as claimed in claim 2 or 3 in combination with said viewing means, characterised in that said viewing means comprises a console (V) containing optics and a viewing screen (50) having a socket (52) for slidably receiving said coupling means (14) for viewing the body cavity (44) on said viewing means (50). The combination as claimed in claim 5, characterised in that said console includes: a rotatable member (59) having a plurality of sockets (52,62,64,66) spaced therearound selectively alignable with said optics, each socket (52,62,64,66) being of a different diameter for accommodating endoscopes of different diameters.

Inventors: ADAIR, EDWIN L.
Applicants: ADAIR, EDWIN L.
Application year: 1988
Main classification: A61B1
IPC codes: A61B1, G02B23