Endoscope with protective sheath

Abstract: An endoscope cover (6,7) comprising a cylindrical rigid cover (6) composed of an elastic material, which is fitted to an endoscope (1) to cover a top end rigid portion (5) of the endoscope (1). Transparent windows (6b,6c) arranged on a closed face (6a) formed on the top end of the rigid cover (6) to confront at least an observation port and an illuminating port, which are arranged on the top end of the endoscope (1), and a bag-shaped covering member (7) having a length covering at least an intermediate conduit portion (3) of the endoscope (1), which is attached to the rear part of the endoscope. A groove or notched faces (5a,5b)are formed in the longitudinal direction of the outer periphery of the top end rigid portion (5) of the endoscope (1) and an anchoring groove (5c) is formed on the circumferential face portion. Anchoring projections (6d,6e) are formed at confronting positions on the inner circumferential face of the rigid cover (6) and are fitted in the anchoring groove (5c) formed in the top end rigid portion (5) to fix the rigid cover (6) to the top end rigid portion (5) and cover the intermediate conduit portion (3) with the covering member (7).

Description: The present device relates to an endoscope and an endoscope sheath as specified in the preamble of claim 1. After an endoscope is used in the body cavity of a patient, the endoscope is generally washed and disinfected. However, this washing and disinfecting operation requires much time and labor, and the working efficiency of the endoscope is very low. Furthermore, if this washing and disinfecting operation is not sufficiently performed, no satifactory washing and disinfecting effect can be attained. Accordingly, an idea of a disposable cover for covering the outer periphery of an endoscope when the endoscope is used has recently been proposed, and an example of the disposable cover is disclosed in Japanese Unexamined Patent Publication No. 61-179128. The disclosed technique concerns an endoscope cover comprising a soft cylindrical coverning member composed of a rubber or synthetic resin, which is attached to a rigid cover fitted to cover a top end rigid portion of the endoscope. According to this endoscope cover, the rigid cover is fitted to the top end rigid portion of the endoscope, a flexible tube of the endoscope is entirely covered with the covering member from the top end side of the flexible tube, the endoscope is inserted in this state into the body cavity of a patient, and after the endoscope is used, the endoscope cover is dismounted and thrown away. When the endoscope is used again, the endoscope is covered with a new endoscope cover and is used in the above-mentioned manner. According to this technique, the endoscope need not be washed and disinfected, and a high sanitary effect is attained and the endoscope can be continuously used. When the above-mentioned endoscope is inserted into the body cavity for the use, or is bent in the body cavity or repeatedly moved to and fro in the inserting direction, the rigid cover comes off from the top end rigid portion or the covering member gets out of position. Even if the rigid cover does not come off, the field of vision is disturbed by the sippage of the rigid conver. Furthermore, if the rigid cover is tightly fitted, it is difficult to dismount the rigid cover. For example, if the rigid cover is screwed, the screw should be turned in the reverse direction when the rigid cover is dismounted, and this operation should be performed with both hands. Accordingly, the operation efficiency is low, and since both hands are used for the dismounting operation, the dirty endoscope should be put at a certain place and the problem of contamination arises. Another endoscope with an endoscope cover is disclosed in DE-A-3 233 564. However, the sheath in this case is not a protective sheath for disposal but it is a cover for an additonal instrument for the endoscope to extend usage therof. In this case the sheath comprises a shrinking tube clamped onto the endoscope wherein a tear open fathom is provided for dismounting the tube from the endoscope. EP-A-0 349 479 discloses an endoscope with an endoscope cover in accordance with the preamble of claim 1 wherein fixation means are provided comprising a circumferential groove wherein the projections comprise a circumferential rib which snaps into the groove and must be removed by deforming said rib. To dismount the cover from the endoscope both hands are needed to deform said rib. EP-A- 0 184 778 discloses an endoscope with a longitudinal groove for reception of a tubular channel connected to a flexible sheath with a rigid distal end. Said sheath is a protection sheath to protect the endoscope against contamination. The sheath comprises an elastic tube which is inflated for extending same for purposes of mounting and dismounting. US-A-4 815 470 relates to a cover for an ultra sound endoscope which is attached to the endoscope by cover projections which cooperate with grooves provided in the endoscope. It is a primary object of the present invention to protect the intermediate conduit portion of the endoscope from contamination during use, and turns next use immediately after the use into posibility, wherein, the rigid cover is prevented from being taken off or getting out of position, and wherein the endoscope cover can be taken off from the endoscope by one touch, and the removal of the used endoscope cover can be accomplished without contamination of the endoscope. In accordance with the present invention, these objects are achieved by characterizing features of claim 1. The invention therefore comprises an endoscope and an endoscope cover with a cylindrical rigid cover composed of an elastic material, which is fitted to an endoscope to cover a top end rigid portion of the endscope, a transparent window arranged on a closed face formed on the top end of the rigid cover to confront at least an observation port and an illuminating port, which are arranged on the top end of the endoscope, and a bag-shaped covering member having a length covering at least an intermediate conduit portion of the endoscope, which is attached to the rear part of the endoscope, wherein a groove or notched face is formed in the longitudinal direction of the outer periphery of the top end rigid portion of the endoscope and an anchoring groove is formed on the circumferential face portion, and anchoring projections are formed at confronting positions on the inner circumferential face of the rigid cover and are fitted in the anchoring groove formed in the top and rigid portion to fix the rigid cover to the top end rigid portion and cover the intermediate conduit portion with the covering member. Furthermore, according to the present invention, an air-injecting opening is formed at the rear end of the covering member. In the above-mentioned structure, if the rigid cover is fitted to cover the top end rigid portion of the endoscope from the covering member, the anchoring projections are anchored in the groove formed in the top end rigid portion by one touch and the transparent window is positioned and fixed to confront the observation port and illuminating port. The covering member is extended along the intermediate conduit portion from the end to cover the intermediate conduit portion entirely. In this state, the intermediate conduit portion can be inserted into the body cavity and used for the observation. After the use, the place separate from the anchoring projections is depressed, whereby the anchoring projections are taken off from the anchoring groove, and therefore, the rigid cover can be removed from the top end rigid portion. Moreover, by drawing out the rigid cover, the intermediate conduit portion can be drawn out without contamination of the endoscope. Therefore, if a new endoscope cover is fitted to the endoscope, the endoscope can be directly used again. Brief Description of the Drawings Fig. 1 is a side view illustrating the state where an endoscope cover is attached to an endoscope. Fig. 2 is a perspective view illustrating the state of a top end rigid portion and a rigid cover in the endoscope. Fig. 3 is a sectional view illustrating the state where the rigid cover is taken off. Fig. 4 is a diagram illustrating the state where the endoscope cover is taken off from the endoscope. Detailed Description of the Preferred Embodiments An example of the present device will now be described with reference to the accompanying drawings. Fig. 1 is a side view illustrating the state where an endoscope cover is attached to an endoscope. Fig 2 is a perspective view illustrating the state of a top end rigid portion of the endoscope and a rigid cover. Fig 3 is a sectional view showing the state where the rigid cover is taken off, Fig. 4 is a diagram illustrating the state where the endoscope cover is taken off from the endoscope. In the drawings, reference numeral 1 represents an endoscope comprising a handle 2, an intermediate conduit portion 3 composed of a flexible tube and a guide tube portion 4 connected to a light source. In general, an image guide, a light guide and an angle-operating wire are disposed in the intermediate conduit portion 3. The top of the intermediate conduit portion 3 forms a bendable angle portion, and a top end rigid portion 5 is attached to the top end of the angle portion. An observation port connected to an image guide and an illuminating port connected to a light guide are formed on the top end of the top end rigid portion 5. Notched faces 5a and 5b confronting each other are formed at symmetric positions on the side face of the top end rigid portion 5, and an anchoring groove 5c is formed on the curcumferential face of the top end rigid portion 5. Reference numeral 5d represents a joint portion to the intermediate conduit portion 3. One of the notched faces 5a and 5b may act as a fitting groove in which a tube having both the ends opened, such as a forceps guide tube continuous from the intermediate conduit portion 3 to the top end rigid portion 5 or an air/water supply tube, is fitted. In the present example, this fitting groove is used. Reference numeral 6 represents a rigid cover, which has a cylindrical shape having an inner diameter sufficient to cover the top end rigid portion 5, and transparent windows 6b and 6c are formed on a closed face 6a on the top end of the rigid cover 6 to confront the observation port and illuminating port and two anchoring projections 6d and 6e are formed at confronting positions on the inner circumferential face of the rigid cover 6. A hood 6f extended to the outer periphery of the top end can be formed according to need. If necessary, a hole corresponding to the above-mentioned fitting groove is formed on the closed face 6a and the end portion of the tube 6g having both the ends opened, such as the forceps guide tube, is attached to this hole. Of course, this hole need not be formed in case of an endoscope not using a forceps or the like, and in this case, the above-mentioned fitting groove and the tube having both the ends opened need not be formed. A soft bag-shaped covering member 7 formed of a rubber or synthetic resin is attached to the outer periphery of the rigid cover 6, and the diameter of the covering member 7 is adjusted to a value almost equal to the outer diameter of the intermediate conduit portion 3 so that the covering member 7 adheres closely to the intermediate conduit portion 3, or adjusted to a value slightly larger than the outer diameter of the intermediate conduit portion 3 so that the covering member 7 loosely covers the intermediate conduit portion 3. In each case, the end portion of the covering member 7 adheres and anchors closely to the intermediate conduit portion 3 at the position of the root of the handle 2 or covers the handle 2 entirely. At the rear portion of the covering member 7, an air-injecting opening 7a is formed so that air can be injected into the covering member 7 from this air-injecting opening 7a. In the above-mentioned example, two notched faces or the fitting groove and notched face are formed, but if the rigid cover is deformed and the anchoring projection is taken off from the anchoring groove, one notched face suffices. In the example having the above-mentioned structure, if the rigid cover 6, headed by the covering member 7, is fitted to cover the top end rigid portion 5 of the endoscope, the anchoring projections 6d and 6e are anchored to the anchoring groove 5c of the top end rigid portion 5 by one touch because of the elasticity of the rigid cover 6 and the holes 6b and 6c are positioned and fixed to confront the observation port and illuminating port. Then, the covering member 7 is extended from the rear part along the intermediate conduit portion 3 to cover the intermediate conduit portion 3 entirely or to cover even the handle 2 as well as the intermediate conduit portion 3. In this state, the intermediate conduit portion 3 is inserted into the body cavity and used for the observation. After the observation, the endoscope cover is taken out from the endoscope. Namely, at first, the rigid cover 6 is depressed from the outside at positions separate by 90° from the positions of the anchoring projections 6d and 6e (these positions are preferably marked), that is, at the corresponding positions of the notched faces 5a and 5b of the top end rigid portion 5, as shown in Fig. 3, whereby the rigid cover 6 is elliptically deformed and expanded and the anchoring projections 6d and 6e are taken off from the anchoring groove 5c. In this state, the rigid cover 6 can be removed from the top end rigid portion 5 by pulling. These procedures will now be described in due order. As shown in Fig. 4, the endoscope is put into a transparent bag 8 having a length sufficient to contain the entire endoscope therein or contain at least the entire intermediate conduit portion 3 therein, so that the operation is carried out in the state where the endoscope is grasped through the bag 8. At first, air is injected into the covering member 7 from the air-injecting opening 7a to separate the endoscope cover from the endoscope, and as pointed out hereinbefore, the rigid cover 6 is depressed from the outside at positions separate by 90° from the positions of the anchoring projections 6d and 6e, whereby the anchoring projections 6d and 6e are taken off from the anchoring groove 5c. Therefore, the rigid cover 6 can be taken out from the top end rigid portion 5 and the intermediate conduit portion 3 can be drawn out from the endoscope cover by pulling it together with the bag 8. The endoscope cover is thrown away together with the bag 8, and the endoscope is not contaminated. Accordingly, by attaching a new endoscope cover to the endoscope, the endoscope can be immediately used again. As is apparent from the foregoing detailed description, according to the present device, there is provided an endoscope cover comprising a cylindrical rigid cover composed of an elastic material, which is fitted to an endoscope to cover a top end rigid portion of the endoscope, a transparent window arranged on a closed face forced on the top end of the rigid cover to confront at least an observation port and an illuminating port, which are arranged on the top end of the endoscope, and a bag-shaped covering member having a length covering at least an intermediate conduit portion of the endoscope, which is attached to the rear part of the endoscope, wherein a groove or notched face is formed in the longitudinal direction of the outer periphery of the top end rigid portion of the endoscope and an anchoring groove is formed on the circumferential face portion, and anchoring projections are formed at confronting positions on the inner circumferential face of the rigid cover and are fitted in the anchoring groove formed in the top end rigid portion to fix the rigid cover to the top end rigid portion and cover the intermediate conduit portion with the covering member. In this structure, even if the endoscope is used, for example, in the body cavity, since the intermediate conduit portion, that is, the inserting portion, is covered with the covering member, the endoscope is not contaminated, and only by exchanging the endoscope cover with a new endoscope cover after the use, the endoscope can be immediately used again. Moreover, since the rigid cover can be fixed to the top end rigid portion, the rigid cover is prevented from being taken off or getting out of position, and there can be attained an effect of ensuring complete covering. Moreover, since the endoscope cover can be taken off from the endoscope by one touch, the removal of the used endoscope cover can be accomplished without contamination of the endoscope, This is another effect attained by the present device.

Claims: An endoscope (1) comprising a rigid top end portion (5) and a bag shaped endoscope sheath (7) composed of an elastic material which is fitted to the rigid top end portion (5) of the endoscope, a transparent window (6b, 6c) arranged on a closed face (6a) formed in the cylindrical end portion (6) to confront at least an observation port and an illuminating port which are arranged on the top end portion (5) of the endoscope, wherein said sheath (7) having a length covering at least an intermediate part (3) of the endoscope and covering said intermediate part (3) characterized in that said endoscope top end portion (5) comprising notches faces (5a, 5b) confronting each other and formed at symmetric positions on the side face of the top end portion (5) of the endoscope and an anchoring groove (5c) on the circumferential face of the top end portion (5) and in that said end portion (6) of said sheath comprising two anchoring projections (6d, 6e) at confronting positions on the inner circumferential face of said rigid end portion (6), engaging said anchoring groove (5c), whereby with one hand control said rigid end portion (6) may be deformed elliptically so that said projections (6d, 6e) are taken off the anchoring groove (5c) to permit removal of said rigid end portion (6) and said sheath (7) from said endoscope. An endoscope as set forth in claim 1, wherein an air injection opening (7a) is formed at the rear end of said sheath (7) to enable air to enter said covering member. An endoscope as set forth in claim 1, further comprising a bag (8) loosely fitting over said sheath (7) and said endoscope to facilitate sanitary removal of said sheath (7) and said rigid end portion (6) from said endoscope. An endoscope as set forth in claim 3, wherein said bag (8) is transparent.

Inventors: CHIKAMA TOSHIO C O MACHIDA END, CHIKAMA, TOSHIO, C/O MACHIDA ENDOSCOPE CO., LTD.
Applicants: MACHIDA ENDOSCOPE CO LTD, MACHIDA ENDOSCOPE CO., LTD
Application year: 1991
Main classification: A61B1
IPC codes: A41D7, A41C3, A61B1, A41C1