Fluid splashing preventive device

Abstract: The invention concerns a foul fluid splashing prevention device for an endoscope, which prevents foul fluids inside the body cavity from splashing even when they spray out from a manipulating part side of the endoscope. The foul fluid splashing prevention device includes a foul fluid absorbing member made of flexible water-absorbing material for absorbing the foul fluids that leak out of an external opening of the endoscope. The splashing prevention device further includes a retaining member, which is detachably disposed at the manipulating part to retain the foul fluid absorbing member in the condition where the foul fluid absorbing member covers the external opening.

Description: BACKGROUND OF THE INVENTION The present invention relates to an endoscope with a fluid splashing preventive device which prevents the splashing of fluides, such as foul fluids, from an external opening that is provided at a manipulating part and is in communication with a fluid path, that opens at an inserted part. Generally with an endoscope, a forceps channel for passing through operative instruments extends through the inserted part. The front end exit of this forceps channel is opened at the front end of the inserted part and the base end entrance of this channel is opened at the manipulating part. However, with the forceps channel as it is, the internal pressure of the body cavity can cause fluids, such as foul fluids inside the body cavity to pass through the forceps channel and escape from the entrance opening, thereby causing contamination of the operator and the surroundings. Thus, in order to prevent the escape of such fluids while enabling the insertion and removal of operative instruments into and from the forceps channel, a so-called forceps plug, comprised for example of a rubber plug with a slit formed therein, is fitted to the entrance opening part of the forceps channel. However, when an operative instrument is passed through the forceps plug, the slit of the rubber valve is spread, causing gaps to form between the rubber plug and the outer peripheral surface of the operative instrument at end portions of the slit, and in many cases, internal fluids are likely to escape from such portions. This problem is serious especially in the case of an operative instrument having a coil pipe as a sheath since such an operative instrument has spiral gaps at its outer peripheral surface. Also, in the case of an operative instrument in which a manipulating wire, etc. is retractably inserted through a sheath, there is a gap between the sheath and the manipulating wire, and internal fluids can escape through this portion. Furthermore, although the suction control valve and air/water conveying control valve disposed at the manipulating part are sealed by means of an O-ring fitted therein, foul body cavity fluids can escape from the leak port, etc. of the control valve when the O-ring becomes worn or damaged. When fluids inside the body cavity escape from the operative instrument insertion entrance in the ways described above, the fluids can splash about onto the surroundings and onto the hands and face of the operator, thereby causing an extremely unsanitary condition to occur. However, it is difficult to prevent such escape of fluids from the inside of the body cavity completely. The similar problem arises in case where an endoscope insertion guiding device is used in combination with the endoscope. In many cases where an endoscope is simply inserted from the anus to perform endoscopy of the large intestine or small intestine, the sigmoid colon portion immediately ahead of the anus bends and thus hinders the insertion of the endoscope deeply. To cope with this difficulty, generally, an insertion guiding device called a sliding tube is used to shorten and straighten out the sigmoid colon. Fig. 87 shows an example of a sliding tube 90. The sliding tube 90 is a somewhat flexible pipe-shaped object with a length of about 40cm. The sliding tube has such a thickness as to permit the insertion of the inserted part of an endoscope, and is provided with the proximal mouthpiece 91 slightly thicker for preventing entry inside the anus entirely. Also, a sponge member 93, impregnated with lubricant and having a slit 92 formed at the center, is disposed inside the proximal mouthpiece 91, and the inserted part of the endoscope is made to pass through the sponge member 93 while spreading the slit 92 portion. Fig. 88 shows the condition in which the sliding tube 90 is used to insert the inserted part 2 of the endoscope 1 into the large intestine from the anus of a patient. As a general procedure, the sliding tube 90 is first put in the condition for straightening the colon portion using the inserted part 2 as a guide. The inserted part 2, which has been inserted through the sliding tube 90, is then pushed in deeper gradually while being pushed and pulled. To insert the inserted part 2 into the large intestine in the above manner, the large intestine must be expanded to some degree by feeding air into the large intestine by means of an air conveying system provided in the endoscope. Thus the pressure inside the large intestine increases. As a result, the air inside the large intestine blows out like flatus via the gap between the anus and the sliding tube 90 or the gap between the sliding tube 90 and the inserted part 2. Since the patient will be subject to great pain if the air from the inside of the large intestine is not expelled at this time, the expulsion of air from the inside of the intestine is unavoidable. However, when air blows out from the anus part, the feces, that have become liquid-like upon being dissolved in purgative, etc., escape along with the air. When the air blows out, the slit (92) portion of sponge member 93 opens as shown in Fig. 89 and the air blows out instantaneously from this portion. Thus in many cases, the feces mixed with the air are scattered about over a wide range. Also, as the inserted part 2 is pushed and pulled, the feces mixed with the lubricant are transferred from the sponge member 93 to the pulled-out portion and contaminate the operator's hands. Likewise, the operator's hands also become dirty with feces when inserted part 2 is pulled out of the anus upon completion of endoscopy. The operator himself will not have a problem since he usually wears rubber gloves in such cases. However, since the operator must touch equipment in the surroundings with the hands (gloves) that have been soiled thus with feces in many cases, such equipment in the surroundings become contaminated. SUMMARY OF THE INVENTION Thus, an object of the present invention is to present an endoscope with a fluid splashing preventive device by which fluids inside the body cavity can be prevented from splashing even when they escape from the manipulating part side or the like of the endoscope, so that endoscopy can be performed in a sanitary manner. In order to attain the above-noted and/or other object(s), the present invention provides an endoscope with a fluid splashing preventive device according to the claims 1, 10 and 21. The endoscope defines an external opening which is in communication with a body cavity and through which fluids within the body cavity can escape The fluid splashing preventive device includes a retaining member and a flexible, fluid absorbing member mountable onto the endoscope by the retaining member. The flexible, fluid absorbing member covering the external opening and absorbing the escaping fluids. The material of the foul fluid absorbing member can be gauze, sponge, open-cell material, water-impregnatable non-woven fabric, or high molecular weight water-impregnatable polymer, and the retaining member can be a cord-like member that is passed through a cord path formed in the foul fluid absorbing member. Furthermore, the foul fluid absorbing member can be formed so as to cover not only the external opening but a part of the grip portion of the manipulating part as well. The external opening may be an entrance for inserting an operative instrument into the forceps channel or a leak port formed on the control valve for conveying air or water or for performing suction. With the embodiment of the present invention, since a foul fluid absorbing member, formed from a flexible, water-absorbing material, is attached to a position where it covers, from the outer side, an external opening provided at the manipulating part so as to be in communication with a fluid path that opens at the inserted part of the endoscope, foul fluids within the body cavity will be absorbed and prevented from splashing even when they escape from the external opening of the manipulating part, thus enabling endoscopy to be performed in a sanitary manner. Also, the foul fluid splashing prevention device can be readily attached, detached, or replaced whenever necessary. As another embodiment of the present invention, a foul fluid splashing preventive device for an endoscope is provided, which is characterized in that a foul fluid absorbing member, that is formed from flexible water-absorbing material and that is for covering an operative instrument insertion entrance disposed at the tip of a protrusion formed on the manipulating part of an endoscope, is retained in a detachably attached manner at the protrusion. A forceps plug, which is substantially closed and which becomes open by an operative instrument upon the insertion of the operative instrument, can be detachably mounted to the operative instrument insertion entrance part, and the removal of the foul fluid absorbing member from the protrusion can be prevented by this forceps plug. Also, a forceps plug, which is substantially closed and which becomes open by an operative instrument upon the insertion of the operative instrument, may be detachably mounted to the operative instrument insertion entrance part and a member for preventing the removal of the foul fluid absorbing member from the protrusion may be provided as a separate member from the forceps plug. Furthermore, a hole into which the operative instrument insertion entrance part is inserted, may be formed in the foul fluid absorbing member, and a presser part for retaining the foul fluid absorbing member may be formed on the forceps plug or the abovementioned separate member and the foul fluid absorbing member may be sandwiched between the presser part and the manipulating part or the protrusion. With the embodiment of the present invention, since a foul fluid absorbing member, which is formed from flexible water-absorbing material and is for covering the operative instrument insertion entrance of an endoscope, is provided, foul fluids within the body cavity are prevented from splashing outward from the operative instrument insertion entrance, thus enabling endoscopy to be performed in a sanitary manner. Also, the inserted part, etc. of the endoscope can be wiped with the foul fluid absorbing member immediately after the completion of endoscopy. Furthermore, since the foul fluid absorbing member is detachably retained at a protrusion of the manipulating part at which the operative instrument insertion entrance is disposed, the foul fluid absorbing member can be readily replaced, etc. whenever necessary. As another embodiment of the present invention, a contamination prevention device fastener for an endoscope is provided, which serves to attachably and detachably retain a foul fluid absorbing member formed of a flexible water absorbing material in a state where the outer wall surface near the operative tool insertion entrance of an endoscope is covered. The fastener is formed of an elastic material into a shape of a horseshoe-like cross section, and the fixed in a state where the outer wall surface of the endoscope is clamped from the outside by its own resiliency with the foul fluid absorbing member sandwiched between itself and the outer wall surface of the endoscope. Furthermore, a pair of foul fluid absorbing members, i.e. the foul fluid absorbing member for covering the outer wall surface on the upper side of the operative tool insertion entrance of the endoscope and the foul fluid absorbing member for covering the outer wall surface on the lower side thereof may be provided so as to be separately retained with independent fasteners. Furthermore, the foul fluid absorbing member for covering the outer wall surface on the upper side of the operative tool insertion entrance of the endoscope and the foul fluid absorbing member for covering the outer wall surface on the lower side thereof may be provided so as to be retained with the same fastener. In this case, a opening to pass the operative tool insertion entrance portion of the endoscope therethrough may be provided in the midportion of the fastener. Furthermore, a finger hook protrusion may be provided protrudingly on the outer surface, or a finger hook protrusion may be provided protrudingly in the halfway portion of the outer surface, or a finger hook protrusion may be provided protrudingly on the edge portion of the outer surface. Furthermore, the edge portion in the axial direction of the fastener may be formed into a shape expanding outward or the edge portion in the axial direction may be formed partly protrudingly into a shape of an ear. In addition, the fastener may be formed symmetrical about the axial direction and a direction between which the axis is sandwiched. With the embodiment of the present invention, a foul fluid absorbing member for absorbing foul fluids escaping from the operative tool insertion entrance can be readily attached to and detached from the outer wall portion of an endoscope, and thus it is possible to prevent foul fluids within a body cavity from splashing from the operative tool insertion entrance during endoscopy, and the absorbing member can be quickly removed for cleaning or disposal upon the termination of endoscopy. Therefore, very sanitary endoscopy can be achieved. Furthermore, even when a foul fluid absorbing member is not mounted mistakenly at the start of endoscopy, it is possible to always mount the foul fluid absorbing member with ease as necessary without extracting the inserting portion inserted into the body cavity. When the contamination of the foul fluid absorbing member reaches a certain level on the way, it is possible to replace it with a new one with ease. As another embodiment of the present invention, a foul fluid splashing preventive device for an endoscope is provided, which is characterized in that a foul fluid absorbing member, formed from flexible, water-absorbing material, is detachably and attachably disposed on the endoscope so as to cover the upper and lower outer wall faces in the vicinity of the operative instrument insertion entrance of the endoscope, and the foul fluid absorbing member is provided with a free end part that can be made to cover and uncover the operative instrument insertion entrance portion. The foul fluid absorbing member may be formed as two separate parts, one part for covering the upper wall face in the vicinity of the operative instrument insertion entrance of the endoscope and the other for covering the lower wall face in the vicinity of the operative instrument insertion entrance of the endoscope. The free end part is provided at one of said parts. The foul fluid absorbing member may also be formed in one piece as a whole. The operative instrument insertion entrance portion may be formed as a protrusion that protrudes from the outer wall face and a hole through which this protrusion is passed may be formed in the foul fluid absorbing member. Also, a separate retaining member may be provided for detachably and attachably retaining the foul fluid absorbing member to the outer wall face, and this retaining member may be made from a resilient material and formed to have a cross sectional shape of a partially cut-out ring and the foul fluid absorbing member may be fixed to the outer wall face by pressing from the outer side. With the embodiment of the present invention, foul fluids that escape from the operative instrument insertion entrance are first absorbed and prevented from splashing by a free end portion of a foul fluid absorbing member that covers the operative instrument insertion entrance portion, the fluids that splash or seep above the operative insertion entrance portion are absorbed by the upper portion of the foul fluid absorbing member, and the foul fluids that tend to drip downward are absorbed by the lower portion of the foul fluid absorbing member. Foul fluids within the body cavity are thus prevented from splashing from the operative instrument insertion entrance and endoscopy can be performed in a sanitary manner. As another embodiment of the present invention, a foul fluid splashing preventive device for an endoscope is provided, which is characterized in that a foul fluid absorbing member formed from water-absorbing material is positioned to face a forceps plug entrance. The forceps plug entrance is disposed at the entrance end portion of a forceps channel in such a manner that it is substantially closed and becomes open by an inserted operative instrument. The water absorbing material is disposed so that the operative instrument can be passed therethrough while being in close contact with the interior of the foul fluid absorbing member. The foul fluid absorbing member may be formed from continuously foamed material (open-shell material). Also, the forceps plugs and a retaining member for the foul fluid absorbing member may be detachably mounted with respect to each other, or and the forceps plug and the retaining member for the foul fluid absorbing member may be provided as an integral unit. The foul fluid absorbing member may be divided into and formed as a plurality of pieces so that the operative instrument to be inserted through the forceps plug is passed between the divided faces of the foul fluid absorbing member while spreading apart the divided faces, or the foul fluid absorbing member may be formed as a single block so that the operative instrument to be inserted into the forceps plug is passed through the foul fluid absorbing member while piercing through the foul fluid absorbing member. With the embodiment of the present invention, since a foul fluid absorbing member formed from water-absorbing material is positioned to face the entrance of a forceps plug disposed at the entrance end portion of a forceps channel in such a manner that an operative instrument can be passed through the foul fluid absorbing member while being in close contact with the interior of the foul fluid absorbing member, foul fluids within the body cavity can be absorbed even when they escape out from the forceps plug and thus prevented from splashing to thereby enable to perform endoscopy in a sanitary manner. Another object of the present invention is to present an endoscope insertion guiding device and a foul fluid splashing preventive device that can significantly alleviate the contamination of the surroundings by feces when an endoscope is inserted into the large intestine from the anus and thereby enable to perform endoscopy in a sanitary manner. This object is attained by the subject-matter according to claim 26. To attain the above-noted and/or other objects, the present invention provides, as an embodiment, a foul fluid splashing preventive member fastener for an endoscope insertion guiding device. The fastener attachably and detachably retains a water-absorbing foul fluid absorbing member at the vicinity of the proximal portion of a flexible, pipe-like, endoscope insertion guiding device that is inserted from the anus into the colon to guide the inserted part of an endoscope. The fastener is made from resilient material and formed to have a horseshoe-like cross-sectional shape. The fastener is fixed by its own resilience in such a manner that it clamps the outer wall face of the insertion guiding device from the outer side while sandwiching the foul fluid absorbing member between itself and the outer wall face of the insertion guiding device. The foul fluid absorbing material may be formed from a flexible material and may be a gauze-like member. Also, a protrusion that serves as a finger hook can be protruded from the outer face, and this finger hook protrusion may be protruded at an intermediate portion of the outer face or at an end portion of the outer face. Furthermore, inward-directed protrusions for restricting the movement of the fastener in the axial direction of the insertion guiding device may be formed at the front and rear ends, or steps for restricting the movement of the fastener in the axial direction of the insertion guiding device may be formed at the insertion guiding device. With the embodiment of the present invention, since a foul fluid absorbing member, for absorbing foul fluids that escape from the proximal portion of an insertion guiding device, can be readily attached to or detached from the insertion guiding device, foul fluids containing feces can be prevented from splashing from the proximal portion of the insertion guiding device during endoscopy, and the foul fluid absorbing member can be removed quickly for cleaning or disposal after the completion of endoscopy. Endoscopy can thus be performed in an extremely sanitary manner. Furthermore, even if one forgets to attach the foul fluid absorbing member prior to the endoscopy, the foul fluid absorbing member can be attached readily whenever necessary without having to draw out of the body the inserted part that has been inserted into the body cavity, and the foul fluid absorbing member can be readily replaced with a new item when the contamination of the foul fluid absorbing member becomes severe during endoscopy. As another embodiment of the present invention, a flexible, pipe-like, endoscope insertion guiding device is provided, which is inserted from the anus into the colon to guide the inserted part of an endoscope. The endoscope insertion guiding device is arranged such that a foul fluid absorbing member, with water-absorbing properties for absorbing foul fluids that escape from the root portion at the proximal side, is mounted in a detachable and attachable manner near the proximal portion. The foul fluid absorbing member may be formed from flexible material and may be retained onto the outer peripheral surface of the proximal portion. The foul fluid absorbing member may be a gauze-like member. The foul fluid absorbing member may also be fixed to the outer peripheral surface of the proximal portion by compression from the outer side by a resilient retaining member. This retaining member may be shaped to have a C-like, U-like, or laid-down U-like cross sectional shape. With the embodiment of the present invention, since a foul fluid absorbing member, provided with water-absorbing properties for absorbing foul fluids that escape from the root portion at the proximal side, is detachably attached to a portion of an insertion guiding device near the proximal portion, the contamination of the surroundings by feces can be alleviated significantly during endoscopy in which an endoscope is inserted into the large intestine from the anus. The present disclosure relates to subject matter contained in Japanese patent application Nos.: 8-223878 (filed on August 26, 1997); 8-223879 (filed on Augsut 26, 1996); 8-223880 (filed on August 26, 1996); 8-260368 (filed on October 1, 1996); 8-260369 (filed on October 1, 1996); 9-029913 (filed on February 14, 1997); 9-029914 (filed on February 14, 1997); 9-040192 (filed on February 25, 1997); 9-041723 (filed on February 26, 1997); and 9-177893 (filed on July 3, 1997). BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side view which shows the condition in which a foul fluid splashing prevention device of a first embodiment of the present invention is attached to the manipulating part. Fig. 2 is a perspective view of the foul fluid splashing prevention device of the first embodiment of the present invention. Fig. 3 is a partial front view which shows the condition in which an operative instrument is used with the foul fluid splashing prevention device of the first embodiment of the present invention being attached to the manipulating part. Fig. 4 is a side view which shows a different condition of use of the foul fluid splashing prevention device of the first embodiment of the present invention. Fig. 5 is a front view of a foul fluid splashing prevention device of a second embodiment of the present invention. Fig. 6 is a front view of a foul fluid splashing prevention device of a third embodiment of the present invention. Fig. 7 is a side view which shows the condition in which the foul fluid splashing prevention device of the third embodiment of the present invention is attached to the manipulating part. Fig. 8 is a side view which shows the condition in which the foul fluid splashing prevention device of the third embodiment of the present invention is attached to the manipulating part in a different manner. Fig. 9 is a perspective view of a foul fluid splashing prevention device of a fourth embodiment of the present invention. Fig. 10 is a schematic sectional plan view which shows the condition in which the foul fluid splashing prevention device of the fourth embodiment of the present invention is attached to the manipulating part. Fig. 11 is a plan view partly in section which shows the condition in which a foul fluid splashing prevention device of a fifth embodiment of the present invention is attached to the manipulating part. Fig. 12 is a side view which shows the condition in which the foul fluid splashing prevention device of the fifth embodiment of the present invention is attached to the manipulating part. Fig. 13 is a side view which shows the usage condition in which a foul fluid splashing prevention device of a sixth embodiment is attached to the manipulating part. Fig. 14 is a perspective view of the foul fluid splashing prevention device of the sixth embodiment. Fig. 15 is a cross section along line 15-15 of the foul fluid splashing prevention device of the sixth embodiment . Fig. 16 is a side view which shows a different usage condition in which the foul fluid splashing prevention device of the sixth embodiment is attached to the manipulating part. Fig. 17 is a front view of a foul fluid splashing prevention device of a seventh embodiment. Fig. 18 is a perspective view of the retainting member of the foul fluid splashing prevention device of the seventh embodiment . Fig. 19 is a side view which shows the usage condition in which the foul fluid splashing prevention device of the seventh embodiment is attached to the manipulating part. Fig. 20 is a front view of a foul fluid splashing prevention device of an eigth embodiment. Fig. 21 is a rear view of the foul fluid splashing prevention device of the eighth embodiment. Fig. 22 is a cross section along line 22-22 of Fig. 20. Fig. 23 is a partial side view which shows the usage condition in which the foul fluid splashing prevention device of the eighth embodiment is attached to the manipulating part. Fig. 24 is a side view which shows the condition in which an operative instrument is used with the foul fluid splashing prevention device of the eighth embodiment being attached to the manipulating part. Fig. 25 is a front view of a foul fluid splashing prevention device of a ninth embodiment present invention. Fig. 26 is a side view partly in section which shows the usage condition in which the foul fluid splashing prevention device of the ninth embodiment is attached to the manipulating part. Fig. 27 is a sectional side view which shows the usage condition in which a foul fluid splashing prevention device of a tenth embodiment is mounted to the manipulating part. Fig. 28 is a perspective view of the foul fluid splashing prevention device of the tenth embodiment. Fig. 29 is a perspective view of a foul fluid splashing prevention device of an eleventh embodiment. Fig. 30 is a side.view partly in section which shows the usage condition in which the foul fluid splashing prevention device of the eleventh embodiment is mounted to the manipulating part. Fig. 31 is a sectional side view which shows the usage condition in which a foul fluid splashing prevention device of a twelfth embodiment of the present invention is mounted to the manipulating part. Fig. 32 is a sectional side view which shows the usage condition in which a foul fluid splashing prevention device of a thirteenth embodiment of the present invention is mounted to the manipulating part. Fig. 33 is a perspective view of a part of the foul fluid splashing prevention device of the thirteenth embodiment of the present invention. Fig. 34 is a sectional side view which shows the usage condition in which a foul fluid splashing prevention device of a fourteenth embodiment of the present invention is mounted to the manipulating part. Fig. 35 is a side view which illustrates the usage condition in which a foul fluid splashing prevention device of a fifteenth embodiment is attached to the manipulating part. Fig. 36 is a front view of the foul fluid splashing prevention device of the fifteenth embodiment. Fig. 37 is a perspective view which illustrates the first usage condition of the foul fluid splashing prevention device of the fifteenth embodiment . Fig. 38 is a side view which illustrates the usage condition in which an operative instrument is used with the foul fluid splashing prevention device of the fifteenth embodiment of the present invention being attached to the manipulating part. Fig. 39 is a side view which illustrates the usage condition in which a foul fluid splashing prevention device of a sixteenth embodiment is attached to the manipulating part. Fig. 40 is a perspective view which illustrates the usage condition of the foul fluid splashing prevention device of the sixteenth embodiment . Fig. 41 is a side view which illustrates the usage condition in which the foul fluid splashing prevention device of the sixteenth embodiment is attached to the manipulating part. Fig. 42 is a side view which illustrates the usage condition in which an operative instrument is used with the foul fluid splashing prevention device of the sixteenth embodiment being attached to the manipulating part. Fig. 43 is a transverse cross-sectional view which illustrates the usage condition in which an operative instrument is used with the foul fluid splashing prevention device of the sixteenth embodiment being attached to the manipulating part. Fig. 44 is a side view which illustrates the usage condition in which the foul fluid splashing prevention device of the sixteenth embodiment is attached to the manipulating part. Fig. 45 is a front view of a foul fluid splashing prevention device of a seventeenth embodiment. Fig. 46 is a side view of the usage condition in which a foul fluid splashing prevention device of an eighteenth embodiment is attached to the manipulating part. Fig. 47 is a side view of the usage condition in which a foul fluid prevention device of a nineteenth embodiment of the present invention is attached to the manipulating part. Fig. 48 is a perspective view of a fastener in the nineteenth embodiment of the present invention. Fig. 49 is a plan sectional view of a portion where the fastener in the nineteenth embodiment of the present invention is mounted on the operating part. Fig. 50 is a plan view showing with a section part of a state where the fastener in the nineteenth embodiment of the present invention is mounted on the operating part. Fig. 51 is a plan view showing with a section part of a state where the fastener in the nineteenth embodiment of the present invention is removed from the operating part. Fig. 52 is a sectional view of a fastener in a twentieth embodiment of the present invention. Fig. 53 is a sectional view of a fastener in a twinty-first embodiment of the present invention. Fig. 54 is a side view of an application state of a fastener in a twenty-second embodiment of the present invention where it is mounted on the manipulating part. Fig. 55 is a perspective view of the fastener in the twenty-second embodiment of the present invention. Fig. 56 is a perspective view of a fastener in a twenty-third embodiment of the present invention. Fig. 57 is a perspective view of the fastener in a twenty-fourth embodiment of the present invention. Fig. 58 is a front view of the fastener in the twenty-fourth embodiment of the present invention. Fig. 59 is a sectional view of a material of the fastener in the twenty-fourth embodiment of the present invention. Fig. 60 is a side view of an application state of a fastener in a twenty-fifth embodiment of the present invention where it is mounted on the manipulating part. Fig. 61 is a perspective view of the fastener in the twenty-fifth embodiment of the present invention. Fig. 62 is a side view of the usage condition in which a foul fluid splashing prevention device of a twenty-sixth embodiment of the present invention is attached to the manipulating part. Fig. 63 is a side view which shows the usage condition in which a foul fluid splashing prevention device of a twenty-seventh embodiment of the present invention is attached to the sliding tube. Fig. 64 is a cross sectional view taken along line 64-64 of Fig. 63. Fig. 65 is a sectional side view of the sliding tube. Fig. 66 is a partially enlarged sectional side view of the sliding tube. Fig. 67 is a schematic view which shows the usage condition of the twenty-seventh embodiment of the present invention. Fig. 68 is a side view which shows the usage condition in which a foul fluid splasing prevention device of a twenty-eighth embodiment of the present invention is attached to the sliding tube. Fig. 69 is a cross sectional view taken along line 69-69 of Fig. 68. Fig. 70 is a front view of the fastener in the twenty-eighth embodiment of the present invention. Fig. 71 is a side view which shows the usage condition in which a foul fluid splashing prevention device of a twenty-ninth embodiment of the present invention is attached to the sliding tube. Fig. 72 is a cross sectional view taken along line 72-72 of Fig. 71. Fig. 73 is a front view of the fastener in the twenty-ninth embodiment of the present invention. Fig. 74 is a side view which shows the usage condition in which a foul fluid splashing prevention device of a thirtieth embodiment of the present invention is attached to the sliding tube. Fig. 75 is a cross sectional view taken along line 75-75 of Fig. 74. Fig. 76 is a side view which shows the usage condition in which a foul fluid splashing prevention device of a thirty-first embodiment of the present invention is attached to the sliding tube. Fig. 77 is a cross sectional view taken along line 77-77 of Fig. 76. Fig. 78 is a side view which shows the usage condition in which a foul fluid splashing prevention device of a thirty-second embodiment is attached to the sliding tube. Fig. 79 is a perspective view of the retaining ring in the thirth-second embodiment . Fig. 80 is a developed view of a foul fluid splashing prevention device of a thirty-third embodiment. Fig. 81 is a side view of the usage condition in which the foul fluid splashing prevention device of the thirty-third embodiment is attached to the sliding tube. Fig. 82 is a longitudinal section view of a foul fluid splashing prevention device of a thirty-fourth embodiment of the present invention. Fig. 83 is a perspective view of a foul fluid absorbing member in the thirty-fourth embodiment of the present invention. Fig. 84 is a side view partly in section of the manipulating part of the endoscope in the thirty-fourth embodiment of the present invention. Fig. 85 is a longitudinal sectional view of a foul fluid splashing prevention device of a thirty-fifth embodiment of the present invention. Fig. 86 is a longitudinal sectional view of a foul fluid splashing prevention device of a thirty-sixth embodiment of the present invention. Fig. 87 is a sectional side view of an example of sliding tube. Fig. 88 is a perspective view which shows the usage condition of the sliding tube. Fig. 89 is a perspective view which shows the condition in which air and foul fluids escape from the sponge member portion of the sliding tube. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will now be described with reference to the drawings. The embodiments according to Fig. 13 to 30, 35-46 and 78 to 81 do not form part of the invention but are useful for understanding the invention. In Fig. 1, reference numeral 1 designates a manipulating part of an endoscope, and an inserted part 2, which is to be inserted into the body cavity, is connected to the lower end portion of this manipulating part 1. A forceps channel 4, which opens out at the front end, is passed through the entire length of inserted part 2. The base end side of the forceps channel 4 is in communication with an operative instrument insertion entrance 5, which is opened at the tip of a protrusion 3 protruded obliquely upwards from the lower end portion of the manipulating part 1. Inside protrusion 3, a forceps plug 6 is disposed adjacent the inner side of the operative instrument insertion entrance 5, which is generally closed but forced to open by insertion of an operative instrument into forceps channel 4 from the operative tool insertion entrance 5. At the upper half portion of manipulating part 1, an air/water conveying control valve 7 and a suction control valve 8 are disposed at the front face side and a curvature manipulating knob 9, for remote manipulation of the bending of a curved part (not shown) formed near the front end of inserted part 2, is disposed at the side face. A grip part 1a is formed between this portion and the lower end portion of manipulating part 1. Although an air conveying tube and a water conveying tube, that are opened at the front end of the inserted part 2, are connected in communication with the air/water conveying control valve 7, these tubes are not illustrated. Also, the suction control valve 8 is connected in communication with the forceps channel 4 at the lower end portion of the manipulating part 1 with forceps channel 4 serving in common as a suction channel. Reference numeral 20 1 designates a foul fluid splashing prevention device for endoscope. As shown in Fig. 2, a plurality of sheets of water absorbing material, for example flexible gauze, are overlapped and folded over to form a foul fluid absorbing member 21 1 , and a retaining member 22 1 , made for example from a rubber band, etc. is engaged with the folded-over part of the absorbing member 21 1 . In this embodiment, foul fluid absorbing member 21 1 is sewn parallel to the fold line near the folded part to form a pass-through hole 23 1 for letting the retaining member 22 1 pass therethrough. The reference numeral 24 1 designates the seam. Although the foul fluid absorbing member 21 1 may simply be folded instead of forming such a pass-through hole 23 1 , the pass-through hole 23 1 eases the attachment/detachment, etc. of the preventive member 20 1 to the manipulating part 1 since the retaining member 22 1 is attached in a stable manner to the foul fluid absorbing member 21 1 . The foul fluid splashing prevention device 20 1 thus constructed is fixed by passing the inserted part 2 of the endoscope through the retaining member 22 1 and binding to a lower end portion of manipulating part 1 by means of the retaining member 22 1 as shown in Fig. 1. The diameter of the retaining member 22 1 is set according to the thickness of the manipulating part 1. In this embodiment, the retaining member 22 1 is fixed at a portion above the protrusion 3 so that the foul fluid absorbing member 21 covers the outer surface of the operative instrument insertion entrance 5 from the upper side. In this condition, the foul fluid absorbing member 21 1 can be held by being lightly pressed by the small finger of the operator's hand that grips the grip part 1a as shown in Fig. 1, and even if foul fluids in the body cavity passing through forceps channel 4 escapes outward from the operative instrument insertion entrance 5, the fluids can be absorbed by the foul fluid absorbing member 21 1 and can not splash about or get on the hands or face of the operator. In case where an operative instrument is used upon inserting it through the forceps channel 4 from the operative instrument insertion entrance 5, the splashing of foul fluid can be prevented by surrounding the periphery of the operative instrument 100 with the foul fluid absorbing member 21 1 as shown in Fig. 3. Also, by covering the grip part 1a of the manipulating part 1 using a half of the foul fluid absorbing member 21 1 and grasping the foul fluid absorbing member 21 1 with the hand that holds grip part 1a as shown in Fig. 4, the foul fluids can be prevented from flowing to the hand, the manipulating part 1 can be held securely without slippage, and the foul fluid absorbing member 21 1 can be held in a stable manner. As shown in Fig. 5, the material of the foul fluid absorbing member is not limited to a gauze and a wide variety of flexible, water-absorbing materials, such as sponge, open-cell material, water-impregnatable non-woven fabric, high molecular weight water-impregnatable polymer, etc., can be used (21 2 , Fig. 5). Also, a solvent weld, etc. can be used in place of the seam (24 2 ) portion for forming the pass-through hole 23 2 . Also, an end-to-end cord-like member 22 3 can be used for the retaining member for example as shown in Fig. 6 and, a Swedish fastener or a hook-and-loop fastener (so-called Velcro tape [trademark]) 22 3 a, etc. can be provided at both ends so that the end portions can be engaged with each other. Fig. 7 shows the condition where the embodiment shown in Fig. 6 is used, and with this embodiment, the detachment and attachment of the preventive device 20 3 to the manipulating part 1 can be performed more readily in comparison to the case where a rubber band is used. Also, as shown in Fig. 8, the retaining member 22 3 can be fixed to the manipulating part 1 at a position below the protrusion 3 so that the absorbing member covers the outer surface of the operative instrument insertion entrance 5 from the lower side. In this case, since the end portion 21 3 a of the foul fluid absorbing member 21 3 is lowered by gravity to a position at which it covers the surface of operative instrument insertion entrance 5, the splashing of foul fluid from the operative instrument insertion entrance 5 can be prevented positively. Figs. 9 and 10 illustrate an embodiment in which retaining rings 22 4 b are formed at the ends of the retaining member 22 4 , and the retaining rings 22 4 b at both ends are hooked and retained on the protrusion 3 under the condition that the retaining member 22 4 is wound around the lower end portion of the operating part 1. The attachment and detachment of foul fluid splashing prevention device 20 4 to and from manipulating part 1 is thus facilitated. It is preferable to use a resilient material for the retaining member 22 4 . Figs. 11 and 12 illustrate an embodiment in which foul fluid splashing prevention device 20 5 is attached to the upper half portion of the manipulating part 1 so that the outer surfaces of the air/water conveying control valve 7 and the suction control valve 8 are covered with the foul fluid absorbing member 21 5 . In this case, the foul fluid that splashes from the leak port, etc., formed on the air/water conveying control valve 7 or suction control valve 8, can be absorbed even when the O-rings fitted to valves 7 and 8 become damaged, etc. Figs. 13 to 16 illustrate an embodiment in which a pressure-sensitive adhesive material is used as the retaining member. As similarly to the former embodiments, a foul fluid absorbing member 21 6 is formed by folding over and overlapping a plurality of sheets of the water-absorbing material, such as flexible gauze, etc. The central portion of this foul fluid absorbing member 21 6 is sewn with thread to prevent it from spreading. As illustrated in Fig. 15 which shows a cross section along the thread (24 6 ) portion, a retaining member 122 6 , which is for retaining the foul fluid splashing prevention device 20 6 to the manipulating part 1 and is formed from a pressure-sensitive adhesive material, such as a double-coated adhesive tape, is adhered onto the surface of the foul fluid absorbing member 21 6 along the portion sewn by thread 24 6 . As shown in Fig. 15, a protective sheet 25 6 , which can be readily peeled off from double-coated adhesive tape 122 6 , is attached to the surface of the adhesive tape 122 6 at the side which is to be adhered onto the manipulating part 1. This protective sheet 25 6 is to be peeled off immediately prior to attaching the adhesive tape 122 6 onto the manipulating part 1. In use, the protective sheet 25 6 is removed, and the retaining member 122 6 is then adhered onto the front outer surface immediately above the protrusion 3 of the manipulating part 1 so that the operative instrument insertion entrance (5) portion is covered with a half of the foul fluid absorbing member 21 6 as shown in Fig. 13. As shown in Fig. 16, the foul fluid absorbing member 21 6 may be positioned so that the halves at both sides can cover the operative instrument insertion entrance 5. In this case, the foul fluid absorbing member 21 6 can be held by being lightly pressed by the small finger of the operator's hand that grips grip part 1a, so that the absorption of foul fluids that leak out from the operative instrument insertion entrance 5 can be enhanced. Figs. 17 and 18 show another embodiment in which a single-coated adhesive tape is used as the retaining member. The retaining member 122 7 of this embodiment is folded as shown in Fig. 18 in the condition prior to use. In use, the non-adhesive tab part 26 7 formed at the tip is pulled outward to draw out the retaining member 122 7 so that it can be adhered onto the outer surface of the manipulating part 1 as shown in Fig. 19. Although a half of the foul fluid absorbing member 21 7 is set along and held together with the grip part 1a of the manipulating part 1 in Fig. 19, the operative instrument insertion entrance 5 may, of course, be covered with the halves of the foul fluid absorbing member 21 7 at both sides. Figs. 20 to 24 show another embodiment. As illustrated in Fig. 22 which shows the section along line 22-22 of Fig. 20, a water-absorbing cloth (or non-woven fabric) 21 8 a, that serves as the foul fluid absorbing member, is provided in its interior with a substance 21 8 b (for example, a high molecular weight water-impregnatable polymer) having higher water absorbing properties than cloth 21 8 a. As shown in Fig. 21, the rear surface of the cloth 21 8 a is provided with a waterproof cloth (or paper) 28 8 . As shown in Fig. 20, the cloth 21 8 a has a double-coated adhesive tape adhered onto its front surface side as the retaining member 122 8 , and in use the retaining member 122 8 is attached to the outer surface of a portion of the manipulating part 1 immediately above the protrusion 3 as shown in Fig. 23. Thus, as shown in Fig. 23, this embodiment also enables to cover the operative instrument insertion entrance 5 with the foul fluid absorbing member 21 8 , and during the use of the operative instrument, the operative instrument 100 that is inserted into operative instrument insertion entrance 5 can be covered with the foul fluid absorbing member 21 8 from the upper side as shown in Fig. 24. Figs. 25 and 26 show another embodiment in which a hole, that is adapted to engage with the protrusion 3 of the manipulating part 1, is bored in the foul fluid absorbing member 21 9 to serve as the retaining member 222 9 . Fig. 25 is a front view of the foul fluid splashing prevention device 20 9 and Fig. 26 shows the usage condition in which the protruded part 3 is passed through hole 222 9 . As is clear from this embodiment, any means can be used as the retaining member as long as it can retain the foul fluid absorbing member onto the manipulating part 1. In case where the hole 222 adapted to engage the protruded part 3 of the manipulating part 1 is formed in the foul fluid absorbing member, the following arrangements are conceivable as additional means for more positively retaining the preventive device onto the manipulating part 1. As shown in Fig. 27, a resilient, rubber forceps plug 322 10 is detachably mounted to the end half of an insertion mouth 10. A flange-like stepped portion 10a is formed at the protruding end portion of the insertion mouthpiece 10, and an engaging hole 322 10 b that is matched in shape with this stepped portion 10a is formed in the forceps plug 322 10 . Thus, when the forceps plug 322 10 is forced against the insertion mouthpiece 10 with the application of a slightly strong force so that the insertion mouthpiece 10 is fitted into the engaging hole 322 10 b of forceps plug 322 10 , the forceps plug 322 10 elastically deforms to cover the insertion mouthpiece 10, so that the forceps plug 322 10 is attached to the insertion mouthpiece 10 in a stable manner with the stepped portion at its tip preventing the removal of the forceps plug 322 10 as shown in Fig. 27. In addition, if the forceps plug 322 10 is pinched with the fingertips, etc. and a slightly strong twisting force is applied thereto, the forceps plug 322 10 can be removed from the insertion mouthpiece 10 while undergoing elastic deformation. In the condition where the forceps plug 322 10 is attached to the insertion mouthpiece 10, the central portion of the forceps plug 322 10 depressingly fits into the inside of the mouth of the insertion mouthpiece 10 (in other words, the inside of the operative instrument insertion entrance 5), and thus the operative instrument insertion entrance 5 is thereby sealed. A slit 12, which is generally closed, is formed at the central portion of the forceps plug 322 10 . The slit 12 is formed at the bottom of a tapered hole that spreads gradually outward, and the outer end portion of this tapered hole serves as the operative instrument insertion entrance 15 of forceps plug 322 10 . Unillustrated operative instruments are passed through the slit 12 upon being inserted via this tapered hole. When an operative instrument is inserted, the slit 12 undergoes elastic deformation and spreads, and the tip of the operative instrument is passed inside the forceps channel 4 and extended towards the affected part from an unillustrated front end exit. As shown in Fig. 28, the foul fluid splashing prevention device 20 10 includes a foul fluid absorbing member 21 10 made of a water-absorbing material such as flexible gauze, high molecular weight water-impregnatable polymer, hydrophilic non-woven cloth, etc., which has, at its central portion, a mounting hole 222 10 , of a diameter that permits the insertion mouthpiece 10 to be inserted loosely. When the endoscope is to be used, the insertion mouthpiece 10 is inserted into the mounting hole 222 10 and the forceps plug 322 10 is thereafter attached to the tip of the insertion mouthpiece 10 as shown in Fig. 27. Since the forceps plug 322 10 is mounted to the insertion mouthpiece 10 in a capping manner, the foul fluid splashing prevention device 20 10 is retained and positively prevented from being removed from the insertion mouthpiece 10. A flange 322 10 a is protruded from the bottom portion of the forceps 322 10 that faces the foul fluid absorbing member 21 10 so as to retain the foul fluid absorbing member 21 10 in a stable manner over a wide area. To remove the foul fluid splashing prevention device 20 10 from the manipulating part 1, the forceps plug 322 10 is removed simply from the insertion mouthpiece 10. The foul fluid splashing prevention device 20 10 can thus be mounted securely and in a stable manner to the manipulating part 1 and can also be readily detached from the manipulating part 1. With the foul fluid splashing prevention device 20 10 that is mounted to the insertion mouthpiece 10, a half portion of the foul fluid absorbing member 21 10 is folded back in a U-turn like manner and made to cover the operative instrument insertion entrance 15 part of the forceps plug 322 10 . Figs. 29 and 30 show another embodiment in which a mounting hole 222 11 is disposed not at the center of the foul fluid absorbing member 21 11 but offset towards the side as similarly to the embodiment shown in Figs. 25 and 26, and the mounting hole 222 11 is engaged with the protrusion 3 of the manipulating part 1 and then the forceps plug 322 11 is mounted above the foul fluid absorbing member 21 11 to the protrusion 3 in a covering manner. The longitudinal side of the foul fluid absorbing member 21 11 is disposed so as to cover the operative instrument insertion entrance 15 of the forceps plug 322 11 from above. If the covering of the operative instrument insertion entrance 15 by the foul fluid splashing prevention device 20 11 causes a hindrance, the foul fluid absorbing member 21 11 can be gripped along with the grip part 1a of the manipulating part 1 as shown by the dashed line of Fig. 30. Fig. 31 shows another embodiment of the present invention in which the flange 322 12 a of the forceps plug 322 12 that depressingly retains foul fluid absorbing member 21 12 is made large so that foul the fluid splashing prevention device 20 12 can be retained more firmly. Figs. 32 and 33 show another embodiment of the present invention in which an alligator-tail-like tail part 322 13 c is formed on the forceps plug 322 13 which is mounted to the insertion mouthpiece 10 at the tip of the protrusion 3, and the foul fluid absorbing member 21 13 is retained by being clamped between this tail part 322 13 c and the surface of manipulating part 1. In this case, there is no need to form a mounting hole in the foul fluid absorbing member 21 13 as shown in Fig. 33. Fig. 34 shows another embodiment of the present invention in which a mounting hole 222 14 is formed in the foul fluid absorbing member 21 14 . This mounting hole 222 14 is engaged with the protrusion 3 of the manipulating part 1, and the foul fluid absorbing member 21 14 is held in place by a presser member 422 14 provided as a separate member from a forceps plug 11 and mounted above the absorbing member 21 14 . The presser member 422 14 is made from resilient rubber and can be elastically deformed and thus readily attached to and detached from a flange part 18 protruded from the protrusion 3 without removable of the forceps plug 1. The foul fluid splashing prevention device 20 14 can thus be replaced readily even during endoscopy. Figs. 35 and 36 show another embodiment. As shown in Fig. 36, a rectangular, sheet-form, foul fluid absorbing member 21 15 is formed by folding over and overlapping a plurality of sheets of water-absorbing material, such as flexible gauze. A pressure-sensitive adhesive surface 122 15 is formed near one of the short sides of the foul fluid absorbing member 21 15 . The pressure-sensitive surface 122 15 undergoes hardly any deterioration under normal environments and is adhered by pressure-application onto the surface to which it is intended to be attached. Note that the force of adhesion onto a plastic or metal surface, etc. is not strong and the pressure-sensitive adhesive surface 122 15 can be detached therefrom by applying a slightly strong force. The foul fluid absorbing member 21 15 is machine sewn at both sides of the pressure-sensitive adhesive surface 122 15 . Reference numeral 24 15 designates the machine-sewn seam. The material of the foul fluid absorbing member 21 15 is not limited to a gauze and a wide variety of flexible, water-absorbing materials, such as sponge, non-woven fabric, high molecular weight water-impregnatable polymer, or an open cell material such as PVA sponge, etc., can be used. The foul fluid splashing prevention device 20 15 , that has been formed in the above manner, is attached to the manipulating part 1 with the pressure-sensitive adhesive surface 122 15 being pressed against and adhered onto the lower-end outer peripheral surface of the protrusion 3. Fig. 37 shows exclusively the foul fluid splashing prevention device 20 15 in this condition. The pressure-sensitive adhesive surface (122 15 ) portion presents a U-like form extending along nearly half the circumference of the outer peripheral surface of the protrusion 3 and the foul fluid absorbing member 21 15 is oriented upwards. As shown in Fig. 35, the foul fluid absorbing member 21 15 is disposed so as to cover the operative instrument insertion entrance 5 at the tip portion of the protrusion 3. When an operative instrument is to be inserted into the forceps channel 4, the foul fluid absorbing member 21 15 that is covering the operative instrument insertion entrance 5 is made to present a slightly open U-like shape as shown in Fig. 38 and the operative instrument 100 is inserted into the forceps channel 4 from the operative instrument insertion entrance 5. Fig. 39 illustrates the case where the width of the foul fluid absorbing member 21 16 is widened and the pressure-sensitive adhesive surface 122 16 is adhered onto an area extending from the outer peripheral surface of the protrusion 3 to the outer peripheral surface of the base side of the manipulating part 1. In this case, the foul fluid splashing prevention device 20 16 can be adhered in a more stable manner. Fig. 40 shows exclusively the foul fluid splashing prevention device in this condition. Fig. 41 illustrates the case where the foul fluid absorbing member 21 16 is attached across the entire circumference of the outer peripheral surface of protrusion 3. In this case, since pressure-sensitive adhesive surface 122 16 is adhered onto the outer peripheral surface of the protrusion 3 in a band-like manner, the foul fluid splashing prevention device 20 16 can be adhered in an even more stable condition. Fig. 42 shows the condition in which the operative instrument 100 is used in the case where the foul fluid splashing prevention device 20 16 is attached to the manipulating part 1 in the above manner, and as shown by the transverse cross section in Fig. 43, the operative instrument 100 is passed through the internal space part formed by the foul fluid absorbing member 21 16 formed into a tubular shape. Fig. 44 illustrates the case where the operative instrument insertion entrance 5' is disposed at a flat portion of the manipulating part 1. In this case, the pressure-sensitive adhesive surface 122 16 is adhered onto the flat portion adjacent the operative instrument insertion entrance 5' so that the foul fluid absorbing member 21 16 covers the operative insertion entrance 5'. When the operative instrument 100 is to be used, the foul fluid absorbing member 21 16 is withdrawn from the operative instrument insertion entrance 5'. Alternatively, a slit 30 may be formed at the portion of the foul fluid absorbing member 21 17 that faces the operative insertion entrance 5' as shown in Fig. 45 so that the operative instrument 100 can be passed through this slit 30. Fig. 46 shows the condition in which a pair of foul fluid absorbing members 21 18 a and 21 18 b are attached to the manipulating part 2. That is, the upper foul fluid absorbing member 21 18 a and lower foul fluid absorbing member 21 18 b are respectively adhered onto the outer wall face of manipulating part 2 by pressure-sensitive adhesive agents 122 18 . So-called double-coated adhesive tape, etc. can be used as the pressure-sensitive adhesive agent 122 18 , and when endoscopy is ended, the foul fluid absorbing member 21 18 is peeled off from the surface of manipulating part 2 and can be replaced with a new item. Fig. 47 shows another embodiment in which the foul fluid absorbing member 21 19 is attached to the manipulating part 1 by separate retaining members 522 19 . The foul fluid absorbing member 21 19 includes an upper foul fluid absorbing member 21 19 a, that covers the outer wall face of the manipulating part 1 at the upper side in the vicinity of the operative instrument insertion entrance 5, and a lower foul fluid absorbing member 21 19 b, that covers the outer wall face of the manipulating part 2 at the lower side in the vicinity of the operative instrument insertion entrance 5. Both the upper foul fluid absorbing member 21 19 a and the lower foul fluid absorbing member 21 19 b are attached to cover the outer wall face of the manipulating part 1 over an area extending from the front side to the left and right sides. Each of the upper side foul fluid absorbing member 21 19 a and the lower side foul fluid absorbing member 21 19 b is detachably retained separately and independently on the manipulating part 1 with a retaining member (fastener) 522 19 made of elastic material such as a metal having spring property and a hard plastic (e.g., nylon, derlin, Teflon, polysulfone and polyimidamide, etc.). The fastener (retaining member) 522 19 is formed into an almost horseshoe-like shape (or C-shaped) in section as shown in Fig. 48. As shown in Fig. 49, the fastener 522 19 is set into such a geometry as to clamp from the outer wall surface of the manipulating part 1 by its own resiliency with the foul fluid absorbing member 21 19 sandwiched between the outer wall surface of the manipulating part 1 and the fastener 522 19 . Both opened edge portions 522 19 a of the fastener are spreaded smoothly and slightly outward to prevent the foul fluid absorbing member 21 19 from being caught thereby. A pair of projections 13 19 for finger hooks are protrudingly formed laterally in the halfway portions of the outer surface of the fastener 522 19 so as to facilitate hooking of the finger when the fastener 522 19 is attached to and detached from the manipulating part 1. When the fastener 522 19 is to be attached, as shown in Fig. 50, while applying the foul fluid absorbing member 21 19 to the outer wall surface of the manipulating part 1 the fastener 522 19 is pressed almost vertically to the axis of the manipulating part 1 from the outside. Then, the fastener 522 19 is subjected to elastic deformation and covers the foul fluid absorbing member 21 19 while expanding. At this time, the fingertips are caught by the protrusions 13 19 and thus prevented from slipping. Then, when the fastener 522 19 covers the foul fluid absorbing member 21 19 as shown in Fig. 49, the foul fluid absorbing member 21 19 is pressed inwardly to the outer wall surface of the manipulating part 1 and retained in place by the fastener 522 19 having the resiliency (spring force) to contract to its original shape. When the foul fluid absorbing member 21 19 is to be removed, the fastener 522 19 is pulled outward with fingertips hooked on to the protrusions 13 19 as shown in Fig. 51. Then, the fastener 522 19 , while being elastically deformed, is removed from the outer wall surface of the manipulating part 1. Thus, the foul fluid absorbing member 21 19 is removed to replace with a new one. Returning to Fig. 47, the upper foul fluid absorbing member 21 19 a is retained by the first fastener 522 19 at a portion of manipulating part 1 immediately above the operative instrument insertion entrance 5 and is extended upwardly so that it can gripped by the inner side of the operator's hand that grips the manipulating part 1. Foul fluids that escape from the operative instrument insertion entrance 5 are thus prevented from getting on the hand and the manipulating part 1 is made less slippery and thus more easy to hold. The upper foul fluid absorbing member 21 19 a itself can also be held in a stable manner. Meanwhile, the lower foul fluid absorbing member 21 19 b is retained by the second fastener 522 19 at a portion of the manipulating part 1 immediately below the operative instrument insertion entrance 5 and is extended downwardly therefrom. Further, the free end 21 19 c, which is positioned above the second fastener 522 19 , is placed on top of the operative instrument insertion entrance (5) portion so as to cover this portion. Thus, even when foul body cavity fluids that have passed through the operative instrument insertion channel escape from the operative instrument insertion entrance 5, most of such fluids can be absorbed by foul fluid absorbing member 21 19 b at the free end 21 19 c and can be prevented from splashing externally or getting on the hands or face of the operator. The foul fluids that splash or seep upwards from the operative instrument insertion entrance 5 will be absorbed by the upper foul fluid absorbing member 21 19 a, thus preventing the hand of the operator that grips manipulating part 1 from getting dirty. Furthermore, the foul fluids that tend to drip downward from the operative instrument insertion entrance 5 are absorbed by the lower half portion of the lower foul fluid absorbing member 21 19 b and are thus prevented from dripping down further. The bed and the patient's skin will thus be prevented from getting dirty. To insert an operative instrument via the operative instrument insertion entrance 5, the operative instrument is inserted into the operative instrument insertion entrance 5 as shown by arrow A (Fig. 47) upon withdrawing the free end 21 19 c of the foul fluid absorbing member 21 19 from the operative instrument insertion entrance (5) portion as indicated by two-dotted chain line of Fig. 47. In addition, the free end 21 19 c of the foul fluid absorbing member 21 19 to cover the operative tool insertion entrance (5) portion may be provided on the upper side foul fluid absorbing member 21 19 a. Furthermore, the finger hook protrusion of the fastener may be formed to have a large protruded amount as shown in Fig. 52 (a finger hook protrusion 13 20 ) or the finger hook protrusion may be formed at the opening edge portion of the fastener as shown in Fig. 53 (a finger hook protrusion 13 21 ). Fig. 54 shows another embodiment of the present invention wherein the upper side foul fluid absorbing member 21 22 a and the lower side foul fluid absorbing member 21 22 b are retained on the manipulating part 1 with a single fastener 522 22 . With this fastener 522 22 , as shown in Fig. 55, the upper side presser part 522 22 a for pressing the upper side foul fluid absorbing member 21 22 a and the lower side presser part 522 22 b for pressing the lower side foul fluid absorbing member 21 22 b are formed into a shape of a horseshoe-like cross section respectively, both being integrally connected by a pair of right and left slender connecting parts 522 22 c. Among these parts 522 22 a, 522 22 b and 522 22 c, the opening part 522 22 d through which the protruding part 3 can pass is formed so that the fastener 522 22 may not interfere with the protruding part 3 formed at its end with the operative tool insertion entrance 5. Thus, since the upper side foul fluid absorbing member 21a and the lower side foul fluid absorbing member 21 22 b can be retained on the manipulating part 1 with the single fastener 522 22 , only one operation enables the attachment and removal of the fastener 522 22 and thus the handling is made simple. While in this embodiment, the free end 21 22 c of the foul fluid absorbing member 21 22 to cover the operative tool insertion entrance (5) portion is provided on the upper side foul fluid absorbing member 21 22 a, the free end of the lower side foul fluid absorbing member 21 22 b may be used. Furthermore, only one connecting part 522 23 c may be provided as in the embodiment shown in Fig. 56. Fig. 57 is a perspective view of the fastener 522 24 in another embodiment of the present invention and Fig. 58 is a front view thereof. Fig. 59 is a sectional view of the tube 522 24 ' to be used as a material for forming the fastener 522 of this embodiment. The fastener 522 24 of this embodiment is formed by cutting the material tube 522 24 '. While the fastener 522 24 of this embodiment is formed into a shape almost the same as that of the fastener 522 24 shown in Fig. 55, the ear-shaped tab portions 522 24 e to pinch with fingertips during attachment and detachment to and from the manipulating part 1 are formed protrudingly at the both edge portions. Since both axial ends of the material tube 522 24 ' is funnel-like spreading cylindrical shape, the fastener 522 24 obtained by machining the material tube 522 24 ' has also a shape of both ends spreading outward. As a result, the ear-shaped portions 522 24 e formed at the edges can be pinched easily with fingertips during the attachment and detachment of the fastener 522 24 . Furthermore, since the fastener 522 24 is formed symmetrical vertically and laterally (i.e., symmetrical about the axial direction and a direction between which the axis is sandwiched), no restriction is made on the mounting direction with respect to the manipulating part 1. Fig. 60 shows another embodiment of the present invention, which is the same with the embodiment shown in Fig. 55, in that the upper side foul fluid absorbing member and the lower side foul fluid absorbing member can be retained on the manipulating part 1 with the single fastener. In this embodiment, as shown in Fig. 61, the opening portion 522 25 d for passing the protruding portion 3 is bored in the central portion of the cylindrical fastener 522 25 formed into a horseshoe shape in section. Numeral 13 25 designates the finger hook protrusion. Fig. 62 shows another embodiment of the present invention in which the fastener shown in Fig. 48 is used in combination with the foul fluid absorbing member shown in Fig. 28. A hole 222 26 is opened in the central portion to permit the protrusion 3 of the manipulating part 1 to pass therethrough. Although in Fig. 62, the upper free end is used as free end 21 26 c of the foul fluid absorbing member 21 26 for covering the operative instrument insertion entrance 5, the lower free end may be used instead. Also, although just one retaining member 522 26 is attached at the upper side with respect to the operative instrument insertion entrance 5, a plurality of retaining members (fasteners) may be attached thereto. Pressure-sensitive adhesive agent may also be used as a means for retaining a foul fluid absorbing member 21 26 in the embodiment shown in Fig. 62, onto manipulating part 1. The foul fluid splashing preventive device according to the present invention can be applied to an endoscope insertion guiding device such as a sliding tube. Fig. 65 shows a sliding tube 50 used as an endoscope insertion guiding device. The sliding tube 50 is made up of a pipe-like member having a relatively simple construction with some flexibility and a length of about 40cm. A proximal mouthpiece 53 is mounted to the proximal end portion of the sliding tube 50. The flexible pipe-like portion is formed such that a flexible sheath or coat 52 closely contacts both the inner and outer surfaces of a spiral tube 51 formed for example by winding a stainless steel web into a spiral manner at intervals with a fixed diameter. Flexible sheath 52 is formed from a flexible tube such as a polyurethane resin tube, and as illustrated in enlarged manner in Fig. 66, a single tube is folded at a front end portion 50a. The proximal mouthpiece 53 is made of metal or hard plastic, and a hole that is in alignment with and in communication with the inner diameter part of flexible sheath 52 is bored through the proximal mouth piece 53 in the axial direction. In order to prevent the entire sliding pipe from entering into the anus during use, the diameter of proximal mouthpiece 53 is made somewhat larger than the outer diameter of the flexible pipe-like portion fitted with flexible sheath 52. Fig. 63 shows the manner in which a foul fluid absorbing member 21 27 , formed from water-absorbing material to absorb the foul fluids that escape from the anus, is detachably attached to the outer peripheral portion of the proximal mouthpiece 53. The foul fluid absorbing member 21 27 , made for example by overlapping flexible, gauze-like material shaped to have a rectangular form, is attached to the proximal mouthpiece 53 by means of a fastener (retaining member) 522 27 which is attached to the outer surface of flexible sheath 52 adjacent the proximal mouthpiece 53. The foul fluid absorbing member 21 27 thus retained by the fastener 522 27 covers and surrounds the periphery of proximal mouthpiece 53 and the adjacent flexible sheath 52 as well as extends beyond the proximal end. A pair of finger hook protrusions 13 27 are protruded in the diametrical opposite direction from the outer surface of the fastener 522 27 . Fig. 64 is a sectional front view of the part at which foul fluid absorbing member 21 27 is retained on the sliding tube 50. The fastener 522 27 is fixed by its own resilience in such a manner as to clamp the outer wall face of flexible sheath 52 radially inwardly while sandwiching the foul fluid absorbing member 21 27 between itself and the outer wall face of the flexible sheath 52 of the sliding tube 50. Fig. 67 shows the usage condition of the sliding tube 50. As shown therein, after bringing sliding tube 50 to the condition where it straightens the colon (102) portion while leaving just the proximal mouthpiece (53) portion outside the anus 101, the inserted endoscope part 2 that has been inserted through the sliding tube 50 is gradually pushed in deeper while being pushed and pulled. A sponge member is not disposed inside the proximal mouthpiece 53 of sliding tube 50 as in the previously explained case (Fig. 87). Thus, when air is to be blown out from the inside of the large intestine, it is blown out from the gap between the sliding tube 50 and the inserted part 2 that has been inserted through the sliding tube 50. In that case, since the opened mouth of the proximal mouthpiece 53 and the periphery of the inserted part 2 adjacent the opened mouth are surrounded by the foul fluid absorbing member 21 27 , the liquified feces, that are mixed with the air blowing out from the opened mouth of the proximal mouthpiece 53, are thus absorbed by the foul fluid absorbing member 21 27 and can not splash therefrom. Further, since the outer peripheral surface of inserted part 2 can be wiped with the foul fluid absorbing member 21 27 when the inserted part 2 is pushed and pulled during the insertion of the inserted part 2, the operator's hands can be prevented from staying dirty with feces. Furthermore, since the outer peripheral surface of the inserted part 2 can also be wiped with the foul fluid absorbing member 21 27 when the inserted part 2 is pulled out from the inside of the sliding tube 50 after completion of endoscopy, the operator's hands can be prevented from staying dirty with feces. Fig. 68 shows another embodiment of the present invention in which a fastener 522 28 is fixed and retained onto the proximal mouthpiece 53 of the sliding tube 50 to retain the foul fluid absorbing member 21 28 in place. The fastener 522 28 is formed from metal or hard plastic having spring-like property into a horseshoe-like (or C-like) shape with an opening width d that is smaller than a diameter D (d < D) as shown in Fig. 69. The fastener 522 28 is fixed and retained in such a manner as to clamp the outer wall face of the proximal mouthpiece 53 radially inwardly by its own resilience while sandwiching the foul fluid absorbing member 21 28 between itself and the outer wall face of the proximal mouthpiece 53. Collar-like stopper protrusions 42 28 , which come in contact with the end faces of the proximal mouthpiece 53 in the condition where the foul fluid absorbing member 21 28 is sandwiched therebetween, are protruded inwards at the front and rear axial ends of the fastener 522 28 . The movement of the fastener 522 28 in the axial direction is restricted by these stopper protrusions 42 28 . Fig. 70 is a front view of the fastener 225 28 , and the portion that protrudes inwards from the broken line is the stopper protrusion 42 28 . The finger hook protrusions 13 28 protrude from the outer faces of the ends of the horseshoe-shaped cross section. Fig. 71 shows another embodiment of the present invention in which, as in the embodiment shown in Fig. 68, a fastener 522 29 is fixed to the proximal mouthpiece 53 of the sliding tube 50 to retain the foul fluid absorbing member 21 29 in place. As shown by the cross sectional view (Fig. 72) and by the front view (Fig. 73), the fastener 522 29 is formed to have a horseshoe-like cross-sectional shape and is fixed and retained in such a manner as to clamp the outer wall face of the proximal mouthpiece 53 radially inwardly while sandwiching the foul fluid absorbing member 21 29 between itself and the outer wall face of proximal mouthpiece 53. However, the length of the fastener 522 29 in the axial direction is made shorter than the proximal mouthpiece 53. The stopper protrusions 42 29 , with a hook-like form, are extended from the front and rear sides of the fastener 522 29 . The end portions of the stopper protrusions 42 29 are protruded inwards and these portions contact the front and rear ends of the proximal mouthpiece 53 to restrict the movement of fastener 225 29 in the axial direction. Fig. 74 shows another embodiment of the present invention. As shown by the cross sectional view (Fig. 75), flat parts 53b are formed at both side faces of the middle portion of the proximal mouthpiece 53 of the sliding tube 50, and the fastener 522 30 is formed to have a horseshoe-like shape having linear parts at the left and right sides in correspondence with the flat parts 53b. The fastener 522 30 is formed from material having a spring-like property. The movement of the fastener 225 30 in the axial direction is restricted since the flat parts 53b are formed only on the middle portion of the outer face of the proximal mouthpiece 53 and the fastener 522 30 comes in contact with step parts 53c on the proximal mouthpiece 13 when it is moved in the axial direction. As shown in Fig. 75, the end portions 44 30 of the fastener 522 30 are bent slightly inwards to enable secure engagement with the proximal mouthpiece 53. Reference numeral 13 30 designates a finger hook protrusion. The finger hook protrusion can be dispensed with. Fig. 76 shows another embodiment of the present invention in which a pair of flanges 53a, which are spaced in the axial direction, are protruded from the proximal mouthpiece 53' of the sliding tube 50 and the fastener 522 31 is attached between these flanges 53a. The movement of the fastener 522 31 in the axial direction is thus restricted by flanges 13a. Fig. 77 shows the cross section along line 77-77 of Fig. 76. In this embodiment, the foul fluid absorbing member 21 31 is wound around the proximal mouthpiece 53' one or more turns, and is retained onto the proximal mouthpiece 53' by the fastener 522 31 under that condition. Fig. 78 shows another embodiment in which a rubber-like string member is used as the retaining member 22 32 for retaining the foul fluid absorbing member 21 32 onto the outer peripheral surface of the proximal mouthpiece 53'. As best shown in Fig. 79, this retaining member 22 32 is formed to have a ring-like form for example by tying both ends of a single rubber string. Fig. 80 shows another embodiment in which a pressure-sensitive adhesive agent 122 33 is applied to the portion of the foul fluid absorbing member 21 33 that is to be attached to the proximal mouthpiece 53. Fig. 81 shows the condition in which this foul fluid absorbing member 21 33 has been attached to the proximal mouthpiece 53. The foul fluid absorbing member 21 33 is fixed and retained by adhesion to the proximal mouthpiece 53 by the pressing of the pressure-sensitive adhesive (122 33 ) portion of the foul fluid absorbing member 21 33 from the outer side against the outer peripheral surface of the proximal mouthpiece 53. After use, the foul fluid absorbing member 21 33 can be subjected to disposal upon peeling the pressure-sensitive adhesive 122 33 from the proximal mouthpiece 53. Figs. 82 to 84 shows another embodiment of the present invention in which a foul fluid splashing preventive device 20 34 including a foul fluid absorbing member and a retaining member is attached to the forceps plug 11. Fig. 82 shows the operative instrument insertion entrance (5) portion in an enlarged manner. The forceps plug 11 is formed from a resilient rubber material. The central portion of the forceps plug 11 fits smoothly into the inside of the operative instrument insertion entrance 5 and a slit 11a is formed in this central portion. A flange with which the forceps plug 11 engages is formed on the tip portion of a mouthpiece 10 protruded from the manipulating part 1. The forceps plug 11 is formed to have a shape that covers mouthpiece 10 in a closely contacting manner. Since forceps plug 11 has resilience, it can be attached and detached freely to and from the mouthpiece 10 while being deformed. A foul fluid splashing prevention device 20 34 , for preventing the outward splashing of the foul fluids that leak out from slit 11a of the forceps plug 11, is detachably disposed on forceps plug 11. The foul fluid splashing prevention device 20 34 includes a foul fluid absorbing member 121 34 , formed from a resilient, water-absorbing, open-cell, foamed material, such as a sponge, which is fitted inside a plastic case (retaining member) 621 34 having a cap-like shape with a hole 622 34 a in the center. As shown in Fig. 83, the foul fluid absorbing member 121 34 is formed by dividing, for example, a short cylindrical member into two in the vertical direction along plane 121 34 a that passes through the axis. And as shown in Fig. 82, the foul fluid absorbing member 121 34 is positioned to face the entrance of the forceps plug 11 with the position of the central axis being matched with that of the forceps plug 11. The halves of the foul fluid absorbing member 121 34 are in a closely contacting condition that prevents the forming of a gap in between. The foul fluid absorbing member 121 34 can also be divided into three or more parts. A flange 11b, with which the case or retaining member 622 34 of the foul fluid splashing prevention device 20 34 engages, is protruded from the outer peripheral surface of the forceps plug 11, and the case 622 34 of the foul fluid splashing prevention device 20 34 is formed to have a shape that covers the flange 11b in a closely contacting manner. And since the forceps plug 11b has resilience, it can be freely attached and detached while being deformed with respect to the case 622 34 . With the embodiment formed in the above manner, even when the foul fluids from the inside of the body cavity leak out to the exterior from the forceps channel 4 via slit 11a of the forceps plug 11 due to the increased internal pressure of the body cavity, the foul fluid that has leaked out can be absorbed by the foul fluid absorbing member 121 34 disposed immediately outside the slit 11a and can be collected inside the case 622 34 . When an operative instrument is to be used, the operative instrument is passed through the hole 622 34 a of the case 622 34 and between division faces 121 34 a of the foul fluid absorbing member 121 34 while spreading the foul fluid absorbing member 121 34 and being in close contact with division faces 121 34 a, and then the operative instrument is inserted into the forceps channel 4 from the operative instrument insertion entrance 5 while spreading slit 11a of forceps plug 11. Although the amount of leakage of foul fluids from the slit 11a increases when the operative instrument is inserted into the forceps plug 11 in the above manner, the foul fluids that have leaked will be absorbed by foul fluid absorbing member 121 34 and collected in the case 121 34 even in this case. When the operative instrument has been drawn back out, the slit 11a of the forceps plug 11 and the division faces 121 34 a of the foul fluid absorbing member 121 34 are both closed by the resilience of the respective parts of themselves and return to the condition prior to the insertion of the operative instrument. Fig. 85 shows another embodiment of the present invention in which the foul fluid absorbing member 121 35 is formed as a single block from a weak water-absorbing material (for example, a sponge of high expansion or foam ratio and coarse foam density). In this case, the foul fluid absorbing member 121 35 is pierced by the operative instrument that is inserted. The embodiment shown in Fig. 86 can be used in the same manner as the embodiment shown in Fig. 82, and the fluid that leaks out from slit 11a of forceps plug 11 can be absorbed by the foul fluid absorbing member 121 35 and collected in the case 622 35 . Fig. 86 shows another embodiment of the present invention in which the case 622 36 of the foul fluid splashing prevention device 20 36 and the forceps plug 11 are formed integrally from rubber material and the foul fluid absorbing member 121 36 is fitted into this integral part, so that a single unit of the forceps plug 11 and the foul fluid splashing prevention device 20 36 can be attached to and detached from the mouthpiece 10 of the operative instrument insertion entrance 5. Although the foul fluid absorbing member 121 36 is divided into two pieces, it can also be formed as an integral piece. With the above arrangement, not only the leakage of the foul fluids to the exterior is reduced further but the number of parts is also reduced. Therefore, the manufacturing cost becomes lower, and it is possible to achieve the economical purpose even if the device is used as a disposal device.

Claims: An endoscope with a fluid splashing preventive device, said endoscope comprising a manipulation part (1) which has an external opening (5) being in communication with a body cavity, said fluid splashing preventive device comprising: a retaining member (522 19 , 522 21 , 522 22 , 522 23 , 522 24 , 522 25 , 522 26 ); and a flexible, fluid absorbing member (21 19 , 21 22 , 21 25 ) mountable onto said manipulation part (1) by said retaining member (522 19 , 522 21 , 522 22 , 522 23 , 522 24 , 522 25 , 522 26 ), characterized in that said retaining member (522 19 , 522 21 , 522 22 , 522 23 , 522 24 , 522 25 , 522 26 ) is elastically deformable and adapted to clamp said absorbing member (21 19 , 21 22 , 21 25 ) between an external surface of said manipulation part (1) and said retaining member (522 19 , 522 21 , 522 22 , 522 23 , 522 24 , 522 25 , 522 26 ). An endoscope with a fluid splashing preventive device according to claim 1, wherein said retaining member (522 19 , 522 21 , 522 22 , 522 23 , 522 24 , 522 25 , 522 26 ) includes a C-shaped elastically deformable fastener adapted to clamp said absorbing member (21 19 , 21 22 , 21 25 ) between said C-shaped portion and said external surface of said manipulation part (1). An endoscope with a fluid splashing preventive device according to ciaim 2, wherein said C-shaped fastener (522 22 , 522 23 , 522 24 , 522 25 ) includes an opening (522 22 d, 522 23 d, 522 24 d, 522 25 d) formed such that a protruded portion (3) can pass therethrough. An endoscope with a fluid splashing preventive device according to claim 3, wherein said fastener (522 22 , 522 23 , 522 24 ) includes an upper side presser part (522 22 a, 522 23 a, 522 24 a) and a lower side presser part (522 22 b, 522 23 b, 522 24 b), said presser parts (522 22 a, 522 23 a, 522 24 a; 522 22 b, 522 23 b, 522 24 b) being integrally connected by one or two slender connecting parts (522 22 c, 522 23 c, 522 24 c), said opening (522 22 d, 522 23 d, 522 24 d) being formed among said presser and connecting parts. An endoscope with a fluid splashing preventive device according to claim 2, wherein said fluid absorbing member (21 19 ) includes an upper fluid absorbing member (21 19 a) and a lower fluid absorbing member (21 19 b), each of said members (21 19 a, 21 19 b) being detachably retained separately and independently by one fastener (522 19 ), respectively. An endoscope with a fluid splashing preventive device according to claim 3 or 4, wherein said fluid absorbing member (21 22 ) includes an upper fluid absorbing member (21 22 a) and a lower fluid absorbing member (21 22 b), said upper fluid absorbing member (21 22 a) being retained by said upper side presser part (522 22 a, 522 23 a, 522 24 a) of said fastener (522 22 , 522 23 , 522 24 ) and said lower fluid absorbing member (21 22 b) being retained by said lower side presser part (522 22 b, 522 23 b, 522 24 b) of said fastener (522 22 , 522 23 , 522 24 ). An endoscope with a fluid splashing preventive device according to claim 3 or 4, wherein both axial ends of said fastener (522 24 ) are formed spreading outward, wherein two ear-shaped tap portions (522 24 e) are formed protrudingly at the edge portions of each of said upper (522 24 a) and lower side presser parts (522 24 b). An endoscope with a fluid splashing preventive device according to claim 7, wherein the fastener (522 24 ) is formed symmetrical in axial direction and lateral direction. An endoscope with a fluid splashing preventive device according to claim 3 or 4, wherein the fastener (522 25 ) includes a fingerhook protrusion (13 25 ). An endoscope with a fluid splashing preventive device, said endoscope comprising a manipulation part (1) which has a protruded mouth piece (10) with an external opening (5) being in communication with a body cavity, said fluid splashing preventive device comprising a retaining element (622 34 , 622 35 ) and a flexible, fluid absorbing member (121 34 , 121 35 ) mountable onto said manipulation part (1) by said retaining member (622 34 , 622 35 ), characterized in that said endoscope includes a resilient forceps plug (11) being attachable onto said mouth piece (10); and said retaining element element (622 34 , 622 35 ) includes a case adapted to be mounted onto said forceps plug (11) with said absorbing member (121 34 , 121 35 ) accomodated between said case and said forceps plug (11). An endoscope with a fluid splashing preventive device according to claim 10, wherein a central portion of said forceps plug (11) fits smoothly into the external opening (5), a slit (11a) being formed in said central portion. An endoscope with a fluid splashing preventive device according to claim 11, wherein said forceps plug (11) is formed to have a shape that covers said mouth piece (10) in a closely contacting manner. An endoscope with a fluid splashing preventive device according to claim 12, wherein said case (622 34 , 622 35 ) is a plastic case having a cap-like shape with a hole (622 34 a, 622 35 a) in the center. An endoscope with a fluid splashing preventive device according to claim 13, wherein a flange (11b) is protruded from the outer peripheral surface of said forceps plug (11), said case (622 34 , 622 35 ) being formed to have a shape that covers said flange (11 b) in a closely contacting manner. An endoscope with a fluid splashing preventive device according to claim 14, wherein said fluid absorbing member (121 34 , 121 35 ) is formed from a resilient, water-absorbing, open-cell, foamed material. An endoscope with a fluid splashing preventive device according to claim 15, wherein said fluid absorbing member (121 34 ) is formed by a short cylindrical member divided into two parts in the vertical direction along a plane (121 34 a) passing through the axis. An endoscope with a fluid splashing preventive device according to claim 16, wherein said absorbing member (121 34 ) is positioned to face an entrance of said forceps plug (11) with the position of the central axis being matched with that of the forceps plug (11). An endoscope with a fluid splashing preventive device according to claim 17, wherein said two parts of the fluid absorbing member (121 34 ) are in a closely contacting condition preventing the forming of a gap in between. An endoscope with a fluid splashing preventive device according to claim 15, wherein said fluid absorbing member (121 34 ) is formed by a short cylindrical member divided into three or more parts. An endoscope with a fluid splashing preventive device according to claim 15, wherein said fluid absorbing member (121 35 ) is formed as a single block from a weak water-absorbing material, said fluid absorbing member (121 35 ) being adapted to be pierced by an inserted operative instrument. An endoscope with a fluid splashing preventive device, said endoscope comprising a manipulation part (1) which has a protruded mouth piece (10) with an external opening (5) being in communication with a body cavity, said fluid splashing preventive device comprising a flexible, fluid absorbing member (121 36 ), characterized in that said fluid splashing preventive device includes a case (622 36 ) and a forceps plug (11), which are formed into a resilient integral part, said integral part being attachable onto said mouth piece (10) with said absorbing member (121 36 ) being fitted into said integral part. A fluid splashing preventive device according to claim 21, wherein said forceps plug (11) is formed to have a shape that covers said mouth piece (10) in a closely contacting manner. An endoscope with a fluid splashing preventive device according to claim 21, wherein said fluid absorbing member (121 36 ) is formed from a resilient, water-absorbing, open-cell, foamed material. An endoscope with a fluid splashing preventive device according to claim 21, wherein said fluid absorbing member (121 36 ) is divided into two parts which are in a closely contacting condition preventing the forming of a gap in between. An endoscope with a fluid splashing preventive device according to claim 21, wherein said fluid absorbing member (121 36 ) is formed as an integral piece. A flexible tubular endoscope insertion guiding device (50) with a fluid splashing preventive device, said guiding device (50) being inserted into an opening in a body to guide an inserted part of an endoscope toward a body cavity and said guiding device (50) having a proximal end through which said inserted part of said endoscope is inserted into an inside of said guiding device, said fluid splashing preventive device comprising: a retaining member (522 27 , 522 28 , 522 29 , 522 30 , 522 31 ) and a flexible, fluid absorbing member (21 27 , 21 28 ,21 29 , 21 30 , 21 31 ) mountable onto said guiding device (50) in the vicinity of said proximal end by said retaining member, characterized in that said retaining member (522 27 , 522 28 , 522 29 , 522 30 , 522 31 ) is elastically deformable and adapted to clamp said absorbing member (21 27 , 21 28 ,21 29 , 21 30 , 21 31 ) between an external surface of said guiding device (50) and said retaining member. A flexible tubular endoscope insertion guiding device (50) with a fluid splashing preventive device according to claim 26, wherein said retaining member (522 27 , 522 28 , 522 29 , 522 30 , 522 31 ) is a C-shaped elastically deformable fastener adapted to elastically clamp said absorbing member (21 27 , 21 28 ,21 29 , 21 30 , 21 31 ) between said C-shaped fastener and said external surface of said guiding device. A flexible tubular endoscope insertion guiding device (50) with a fluid splashing preventive device according to claim 26, wherein said C-shaped fastener (522 28 , 522 29 ) includes stopper protrusions (42 28 , 42 29 ) engaging a portion (53) of said proximal end to restrict axial movement of said C-shaped fastener (522 28 , 522 29 ). A flexible tubular endoscope insertion guiding device (50) with a fluid splashing preventive device according to claim 27, wherein said proximal end includes spaced flanges (53a), said C-shaped fastener (522 31 ) being positioned between said spaced flanges (53a) to restrict axial movement of said C-shaped fastener (522 31 ). A flexible tubular endoscope insertion guiding device (50) with a fluid splashing preventive device according to claim 27, wherein said proximal end includes flat parts (53b) on side faces thereof, said C-shaped fastener (522 30 ) being positioned at said flat parts (53b) to restrict axial movement of said C-shaped fastener (522 30 ).

Inventors: OOSHIMA KENJIRO, OUCHI TERUO, OOSHIMA, KENJIRO, OUCHI, TERUO, Ouchi, Teruo, c/o Asahi Kogaku Kogyo K.K.
Applicants: OOSHIMA KENJIRO, PENTAX CORP, OOSHIMA, KENJIRO, PENTAX CORPORATION
Application year: 1997
Main classification: A61B1
IPC codes: A61B19