JP3645224B2 - Hood member mounting tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hood member attachment tool used when a hood member is attached to a distal end portion of an endoscope insertion portion.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as an example of an endoscope apparatus used for surgery, there is one in which an objective lens, a light guide, an air / water feed port, and a suction port are disposed at the distal end portion of an insertion portion of an endoscope. In such an endoscope apparatus, light such as a living tissue is irradiated from a light guide, the object irradiated with light is visually recognized through an objective lens, and air or water sent from an air / water feed port, or other The substance can be sucked through the suction port.
[0003]
By the way, for example, when trying to insert an endoscope into the stomach, the gastric mucosa often touches the objective lens provided at the distal end of the insertion portion of the endoscope, and the tip is often invisible. .
[0004]
Corresponding to this, Japanese Patent Laid-Open No. 11-206702 discloses an inner portion provided with a guide portion for preventing the mucous membrane from covering the objective lens and losing the visual field at the distal end portion of the insertion portion of the endoscope. A tip structure of an endoscope is disclosed. The guide portion of the distal end structure of the endoscope is a hood-like member, and the inner peripheral surface is formed in an expanded shape by drawing a round from the distal end surface of the distal end portion.
[0005]
However, in the structure described in Japanese Patent Application Laid-Open No. 11-206702, if the protrusion of the guide portion is long, the objective lens is close to the guide portion, or the viewing angle that has become widespread in recent years is wide and the shape of the observation field of view In the case of a video scope having a non-circular shape and a viewing angle different depending on the direction, the guide portion can be seen in the field of view and the observation performance is lowered. On the other hand, if the protrusion length of the guide portion is shortened so that the guide portion does not enter the field of view, the effect of preventing the mucous membrane from covering the objective lens cannot be sufficiently obtained, and the insertability and observation performance are deteriorated. .
[0006]
[Problems to be solved by the invention]
In the endoscope apparatus in which the hood member is detachably provided at the distal end portion of the endoscope, when the hood member is attached to the distal end portion of the endoscope, when the amount of pushing into the hood member at the distal end portion is insufficient, The hood member protrudes from the normal position, and the amount of the hood member visible in the observation field increases. On the other hand, when the hood member is mounted so that the protruding length is shorter than the normal position, the effect of the hood member is reduced. In order to prevent this, even if the hood member is provided with an axial positioning portion, if the hood member is formed of a soft material, the positioning portion will be deformed at the time of mounting, There were many cases where it was not possible to install in position.
[0007]
Further, in the endoscope apparatus in which the hood member is formed detachably at the distal end portion of the endoscope, the rotation direction of the hood member is different from the normal position when the hood member is formed in a shape matching the visual field. There is a possibility that the hood member may be attached to the position, and the amount of the hood member entering the observation visual field may increase.
[0008]
In order to solve such a problem, if a hood member positioning mechanism is provided at the distal end portion of the endoscope insertion portion, there is a problem that the distal end portion of the endoscope insertion portion is complicated and enlarged.
[0009]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hood member mounting tool that allows a hood member to be easily and accurately mounted on the distal end portion of an insertion portion of an endoscope.
[0010]
[Means for Solving the Problems]
In order to achieve the object, the hood member mounting tool according to claim 1 is a hood member mounting tool for mounting a detachable hood member at a distal end portion of an insertion portion of an endoscope, and restricts the position of the hood member. And a hood member restricting means for restricting the position of the distal end portion of the insertion portion. When the hood member is attached to the distal end portion of the insertion portion, the hood with respect to the distal end portion of the insertion portion is provided. The mounting position of the member is regulated.
[0011]
The hood member mounting tool according to claim 2, wherein the hood member restriction means has a hood member axial direction restriction portion for restricting an axial position of the hood member, and the tip portion restriction means is a tip of the insertion portion. It has a front-end | tip part axial direction control part which controls the position of the said axial direction of a part.
[0012]
The endoscope apparatus according to claim 3, wherein the hood member restricting unit includes a hood member rotation direction restricting portion that restricts a position of the hood member in the rotation direction, and the distal end portion restricting unit is the distal end of the insertion portion. It has the front-end | tip part rotation direction control part which controls the position of the said rotation direction of a part, It is characterized by the above-mentioned.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
1 to 6 relate to a first embodiment of the present invention, FIG. 1 is an explanatory view showing the overall configuration of the endoscope apparatus, FIG. 2 is a sectional view of the distal end portion of the endoscope, and FIG. 4 is a front view of the distal end portion of the endoscope, FIG. 4 is a side view showing a hood member detachably connected to the distal end portion of the endoscope, FIG. 5 is a plan view showing an observation image displayed on the monitor, and FIG. It is explanatory drawing which shows the observation visual field area | region in the case of displaying the observation image of FIG.
[0014]
(Constitution)
FIG. 1 shows the overall configuration of the endoscope apparatus.
As shown in FIG. 1, the endoscope apparatus 1 includes an endoscope 2, a light source device 3, a video processor 5, and a monitor 6.
[0015]
The endoscope 2 includes an imaging unit described later. The light source device 3 is detachably connected to the endoscope 2 and supplies illumination light to a light guide provided in the endoscope 2. The video processor 5 is connected to the endoscope 2 via the signal cable 4 to control the imaging unit of the endoscope 2 and processes a signal obtained from the imaging unit. The monitor 6 displays a video corresponding to the subject image output from the video processor 5.
[0016]
The endoscope 2 includes an insertion portion 7, an operation portion 8, a connection cord 9, a connector portion 10, and an electrical connector portion 11.
[0017]
The insertion part 7 has flexibility and is formed in an elongated shape. The operation unit 8 is connected to the proximal end side of the insertion unit 7. The connection cord 9 has flexibility and extends from the side of the operation unit 8. The connector part 10 is provided at the end of the connecting cord 9 and is connected to the light source device 3 in a detachable state. The electrical connector portion 11 is provided on the side portion of the connector portion 10 so that the signal cable 4 connected to the video processor 5 can be connected in a detachable state.
[0018]
The electrical connector portion 11 is provided with a ventilation portion (not shown) that communicates the inside and the outside of the endoscope 2.
[0019]
The connecting portion between the insertion portion 7 and the operation portion 8 is provided with an insertion portion-side bending preventing member 12 having an elastic member that prevents a sudden bending of the connecting portion. The connecting portion between the operating portion 8 and the connecting cord 9 is also provided with an operating portion side folding member 13 similar to the insertion portion side folding member 12. Further, the connecting portion between the connecting cord 9 and the connector portion 10 is provided with a connector portion side folding preventing member 14 similar to the insertion portion side folding preventing member 12.
[0020]
The insertion portion 7 is configured by connecting the flexible tube portion 15, the bending portion 16, and the distal end portion 17 in order from the proximal end side.
[0021]
The flexible tube portion 15 has flexibility and is formed softly. The bending portion 16 is provided on the distal end side of the flexible tube portion 15 and can be bent by the operation of the operation portion 8. The distal end portion 17 is provided with a later-described observation optical system, illumination optical system, and the like provided at the distal end.
[0022]
As shown in FIGS. 2 and 3, the distal end portion 17 has an air / water feeding nozzle 18, which is an air / water feeding port, a suction port 19, a liquid feeding port 20, an observation optical system 34, and an illumination. An optical system 35 is provided.
[0023]
The air / water supply nozzle 18 ejects cleaning liquid and gas toward the optical member on the outer surface of the observation optical system 34. The suction port 19 is an opening on the distal end side of the treatment instrument channel for inserting the treatment instrument disposed in the insertion portion 7 and sucking the liquid in the body cavity. The liquid supply port 20 is open toward the observation object, and is an opening for ejecting the liquid toward the observation object.
[0024]
As shown in FIG. 1, the connector unit 10 is provided with a gas supply base 21, a water supply tank pressurization base 23, a liquid supply base 24, a suction base 25, an injection base 26, and a ground terminal base 27. It has been.
[0025]
The gas supply base 21 is detachably connected to a gas supply source (not shown) built in the light source device 3. The water supply tank pressure cap 23 and the liquid supply cap 24 are detachably connected to a water supply tank 22 which is a liquid supply source. The suction cap 25 is connected to a suction source (not shown) for performing suction from the suction port 19 shown in FIG. The inlet gold 26 is connected to a water supply means (not shown) for supplying water from the liquid supply port 20 shown in FIG. The ground terminal base 27 returns the leakage current to the high frequency treatment device when a high frequency leakage current is generated in the endoscope 2 by performing a high frequency treatment or the like.
[0026]
The operation unit 8 includes an air / water supply operation button 28, a suction operation button 29, a bending operation knob 30, a plurality of remote switches 31, and a treatment instrument insertion port 32.
[0027]
The air / water supply operation button 28 is an operation unit for performing an air supply operation or a water supply operation. When the operator presses the air / water supply operation button 28, air or water can be supplied from the air / water supply nozzle 18 shown in FIG. 3. ing. The suction operation button 29 is an operation unit for performing a suction operation, and can be sucked by the suction port 19 shown in FIG. 3 when pressed by an operator. The bending operation knob 30 is an operation unit for performing the bending operation of the bending portion 16. The plurality of remote switches 31 are operation units for remotely operating the video processor 5. The treatment instrument insertion port 32 is an opening on the base end side communicating with the treatment instrument channel.
[0028]
Further, a waterproof cap 33 for sealing the electrical connector portion 11 in a liquid-tight manner can be detachably connected to the electrical connector portion 11 of the endoscope 2.
[0029]
Next, the hood member 37 which is a main part of the present invention will be described.
As shown in FIGS. 2 and 3, a hood member 37 is detachably connected to the distal end portion 17 of the insertion portion 7 of the endoscope 2.
[0030]
That is, the hood member 37 prevents the state-of-the-art lens of the observation optical system 34 exposed from the distal end surface of the distal end portion 17 from directly contacting the inner wall of the body cavity while being fixed to the distal end portion 17. This is to prevent the loss of the second field of view.
[0031]
The hood member 37 can be formed of a soft member such as a vulcanized rubber such as silicon rubber or fluorine rubber, a thermoplastic elastomer such as a urethane elastomer, an acrylic elastomer or an olefin elastomer, or a hard resin such as polysulfone. . In the present embodiment, the hood member 37 is formed of a soft member.
[0032]
The hood member 37 includes a protruding portion 38 and an endoscope fixing portion 39.
The protruding portion 38 is formed in a petal shape and protrudes in the direction in front of the visual field from the distal end portion 17. The endoscope fixing portion 39 is formed in a cylindrical shape and is provided on the proximal end side of the protruding portion 38.
[0033]
The inner diameter of the endoscope fixing portion 39 is formed to be substantially the same as or slightly smaller than the outer diameter of the distal end portion 17, and is formed in an elastically deformable state. Thereby, the distal end portion 17 of the endoscope fixing portion 39 can be press-fitted.
[0034]
A tapered portion 45 is provided on the outer periphery of the proximal end portion of the endoscope fixing portion 39. The taper portion 45 reduces the step of the base end portion and thins the base end portion to facilitate elastic deformation so that the distal end portion 17 can be easily press-fitted into the endoscope fixing portion 39. .
[0035]
The tightening rate at the time of press-fitting does not come off due to friction with the body cavity wall in the examination, and is configured to have a fixing strength that can be easily attached / detached at the time of attachment / detachment. Specifically, the loading / unloading force amount is set to about 5 to 20N.
[0036]
The length of the endoscope fixing portion 39 is a range in which the end of the endoscope fixing portion 39 does not reach the position of the rotation pin 36 on the most distal end side of the bending portion 16 when the endoscope fixing portion 39 is attached to the distal end portion 17. It is formed as long as possible. As a result, the endoscope fixing portion 39 ensures the fixation by increasing the fitting length with the distal end portion 17 as much as possible within a range that does not affect the bending operation of the bending portion 16.
[0037]
Between the endoscope fixing portion 39 and the protruding portion 38, a tip end contact portion 40 protruding to a diameter smaller than the outer diameter of the tip portion 17 is provided.
[0038]
The distal end surface of the distal end portion 17 abuts on the distal end abutment portion 40 so that the distal end portion 17 and the hood member 37 can be positioned in the axial direction. Note that the tip end contact portion 40 may be provided on a part rather than the entire circumference.
[0039]
As shown in FIG. 3, the tip end abutting portion 40 is provided with a rotational direction positioning portion 41 that partially protrudes inward.
[0040]
The rotation direction positioning portion 41 is provided with a nozzle engagement groove 42 cut out in a concave shape. The air supply / water supply nozzle 18 is engaged with the nozzle engagement groove 42, and by this engagement, the distal end portion 17 and the hood member 37 are positioned in the rotational direction with the axial direction as the rotation center.
[0041]
On the inner peripheral surface side of the projecting portion 38, a slope-shaped slope portion 44 having a diameter increasing from the tip contact portion 40 toward the tip side of the projecting portion 38 is provided. Thereby, on the inner peripheral surface side of the projecting portion 38, water, body fluid, filth, and the like attached to the surface of the tip portion 17 easily flows to the outside of the projecting portion 38, and these are difficult to collect.
[0042]
As shown in FIGS. 3 and 4, the tip edge 43 of the protrusion 38 has a shape corresponding to the observation field area of the observation optical system 34 so that the tip edge 43 can be seen as little as possible in the observation image. Is formed.
[0043]
As shown in FIG. 5, the observation image 46 displayed on the monitor 6 has a substantially rectangular shape.
[0044]
FIG. 6 shows an observation visual field region when such an observation image 46 is displayed.
The surface A1 is the most advanced lens surface of the observation optical system 34 shown in FIG. 3, and the surface B1 is a virtual surface about 4 mm from the lens surface.
[0045]
The observation visual field range on the surface A1 is the region a1, and the observation visual field range on the surface B1 is the region b1.
[0046]
A space between the region a1 and the region b1 is an observation visual field region 47.
At this time, the lateral surface of the observation visual field region 47 becomes a slope 48 formed from a set of light rays.
[0047]
As shown in FIG. 5, since the diagonal length L2 is longer than the diagonal length L1 in the observation image 46, the diagonal viewing angle is larger.
[0048]
Further, in the observation optical system 34 normally used for the endoscope 2, the degree of image compression is larger at a position farther from the center due to the aberration of the optical system due to its characteristics.
[0049]
Therefore, in the case of the shape of the observation image 46 shown in FIG. 5, the shape of the region b1 is not the same shape as the observation image 46 as shown in FIG. 6, and the region in the diagonal direction X is large. Therefore, the shape of the slope 48 is uneven.
[0050]
As shown in FIGS. 2 and 4, the front end edge 43 is formed in a shape corresponding to the inclined surface 48, and the upper end edge 43 in the figure and the portion 43a indicated by the hatched portion shown in FIG. Are formed in substantially the same shape as the shape of the slope 48 shown in FIG. 6 at each position, or the slope 48 is slightly offset from the shape of the slope 48 as shown in FIGS. A portion 49 is formed.
[0051]
As shown in FIGS. 3 and 4, the tip edge portion 43 has an uneven shape reflecting the shape of the slope 48 described above. In this case, as for the front edge part 43, A part, B part, C part, and D part are convex, and E part, F part, G part, and H part are concave.
[0052]
In the case where the protruding portion 38 has a concave portion and unevenness is generated, it is desirable that the protruding length is increased as a convex portion in the vicinity of the observation optical system 34. Further, it is desirable that there are three or more convex portions.
[0053]
In the E part, the F part, the G part, and the H part which are the concave parts, the slope part 44 is connected to the slope 48 and is an opening toward the outside. Mucus, filth, and water fed from the air / water feeding nozzle 18 entering the inside of the protruding portion 38 are discharged from these concave portions to the outside of the protruding portion 38 via the slope portion 44. Thereby, a visual field is not obstruct | occluded by filth, mucus, etc.
[0054]
As shown in FIG. 4, a chamfer 71 having a radius of about 0.3 to 1 mm is formed on the outer edge of the tip edge 43. A chamfer 72 having a radius of about 0.3 to 1 mm is also formed at the tip end portion of the slope portion 49.
[0055]
As shown in FIG. 2, the observation depth of the observation optical system 34 is set to 4 mm to 100 mm, and the protrusion amount L0 at the position where the protrusion amount of the distal end edge 43 from the most advanced lens of the observation optical system 34 is the largest is as follows. The depth is set to be approximately equal to the minimum value (near point) or longer than this value. In the present embodiment, the tip edge portion 43 is formed to project so that the projecting amount L0 is about 4 mm.
[0056]
With such a structure, the endoscope apparatus 1 according to the present embodiment has a hood having a protruding portion 38 protruding in the observation visual field direction of the endoscope 2 at the distal end portion 17 of the insertion portion 7 of the endoscope 2. A member 37 is provided, and the observation image 46 of the endoscope 2 has a non-circular shape.
[0057]
In the endoscope apparatus 1, a slope portion 49 having a shape corresponding to the observation visual field region 47 of the endoscope 2 is formed at the distal end edge portion 43 of the protruding portion 38.
[0058]
(Function)
When the hood member is transparent, the illumination performance is good because the illumination light is not blocked by the hood member.
[0059]
The hood member may be black. In this case, the protrusion may be provided with a notch and a sloped portion in the same manner as the observation visual field region in accordance with the irradiation region of the emitted light of the illumination optical system.
[0060]
In the case of black, the illumination light is not reflected by the inner wall of the hood member as compared with the transparent one, so that halation that occurs when using a treatment instrument can be prevented.
[0061]
Further, the color may be matched with an applicable inner celebration mirror and a hood member, and the color may be changed if it is not applicable. Moreover, in order to make removal of a front-end | tip part and a hood member easy, you may make these colors different and may recognize each easily.
[0062]
It should be noted that the endoscope model name to which this can be applied and the outer diameter of the distal end of the endoscope may be displayed on the hood member.
[0063]
In addition, the protrusion amount of a protrusion part can be set to about 2 mm-10 mm.
7 and 8 are explanatory views for explaining the operation of the protruding portion 38 of the first embodiment.
[0064]
In FIG. 7, the solid line indicates the shape of the protruding portion 38 of the present embodiment, and the broken line forms the shapes of the chamfers 71 and 72 without providing the inclined surface portion 49 while maintaining the protruding length of the protruding portion 38. The shape of the protrusion part 38 in the case of doing is shown. When the protruding portion 38 is formed as shown by the broken line, the protruding portion 38 becomes thin.
[0065]
That is, in the present embodiment, the slope portion 49 corresponding to the observation visual field region 48 is provided, so that the protrusion 38 has a large thickness without shortening the protrusion length. Thereby, in this Embodiment, the protrusion part 38 can be made hard to damage, and even if the protrusion part 38 has a some notch shape, when the protrusion part 38 is pressed on the body cavity inner wall, Deformation can be prevented. Moreover, in this Embodiment, since the chamfers 71 and 72 can be formed large, insertability improves.
[0066]
In FIG. 8, the solid line indicates the shape of the protruding portion 38 of the present embodiment, and the broken line indicates the shape when the wall thickness is ensured without providing the inclined portion 49 on the protruding portion 38. When the protruding portion 38 is formed as indicated by the broken line, the protruding length of the protruding portion 38 is shortened.
[0067]
That is, in the present embodiment, the protruding length of the protruding portion 38 can be increased without increasing the outer diameter, and the performance of the hood is improved.
[0068]
Further, even when the mucous membrane is in contact with the tip edge portion 43 and covers the entire visual field, the protrusion amount L0 of the tip edge portion 43 shown in FIG. The observation optical system 34 is focused on the mucous membrane of the distal end edge 43, and the observation image becomes clear.
[0069]
(effect)
As described above, according to the present embodiment, the endoscope apparatus has a small diameter, the hood member 37 is not easily damaged, has good insertability, and the hood member 37 is less visible in the observation image and has good observation performance. Can provide. Further, according to the present embodiment, it is possible to provide an endoscope apparatus with good observation performance even when the hood member 37 contacts the mucous membrane.
[0070]
In the present embodiment shown in FIGS. 1 to 6, an index for aligning the position of the hood member 37 in the rotational direction is provided, for example, on the tip edge 43 without providing the nozzle engaging groove 42. Also good. At this time, as a mark on the distal end portion 17 side for aligning the index, an index may also be attached to the distal end portion 17 side, or a configuration adapted to the air / water supply nozzle 18, suction port 19, and observation optical system 34 of the distal end portion 17. It is also good.
[0071]
When the hood member 37 is separate from the endoscope 2, the attachment position of the hood member 37 and how the hood member 37 appears in the observation image are likely to vary, but the slope portion corresponding to the observation visual field region corresponding to each position By forming the protrusion length as long as possible, it is possible to ensure a long protrusion length even when there is variation.
[0072]
In addition, according to the present embodiment, it is easy to attach the hood member 37 with the inclined surface disposed at an appropriate position according to the observation visual field region by providing the positioning means and the index in the axial direction and the rotational direction. It can be done.
[0073]
(Second Embodiment)
FIG. 9 is a side view showing the distal end portion of the endoscope according to the second embodiment of the present invention with a part cut away.
[0074]
(Constitution)
The second embodiment shown in FIG. 9 is different from the first embodiment shown in FIG. 2 in that the hood member 137 is formed integrally with the distal end portion 17.
[0075]
As shown in FIG. 9, the hood member 137 is formed of a hard resin such as polysulfone, and also serves as an insulating cover that covers the metal component 117 inside the distal end portion 17.
[0076]
The observation optical system 34 of the distal end portion 17 has an observation visual field region 47 similar to that of the first embodiment shown in FIG.
[0077]
A slope 149 corresponding to the slope 48 of the observation visual field region 47 is provided at each position on the tip edge 143 of the hood member 137.
[0078]
The tip edge portion 143 of the hood member 137 is provided with a slope portion 149 corresponding to the slope 48 of the observation visual field region 47 at each position as in the first embodiment shown in FIGS.
[0079]
Further, a chamfer 71 having a radius of about R1 mm is formed on the outer peripheral edge of the leading edge 143.
[0080]
In the present embodiment, the slope portion 149 is formed as wide as possible, and the tip edge portion 143 is formed as thick as possible.
(Function)
In the case where the hood member 137 is formed integrally with the distal end portion 17, the durability of the hard member is better than that of the soft member from the viewpoint of resistance to cutting and abrasion.
[0081]
When the hood member 137 is formed of a hard member, the tip edge 143 is more likely to be damaged by an impact or the like than when it is formed of a soft member. However, in the second embodiment, the meat of the tip edge 143 is Since the thickness can be increased and the chamfer 71 can be formed into a large R shape, even if it is hard, it can be made difficult to break.
[0082]
(effect)
As described above, according to the second embodiment, the same effect as that of the first embodiment shown in FIGS. 1 to 6 is obtained, and also when the hood member 137 is formed of a hard member. It can be made difficult to break sufficiently.
[0083]
(Third embodiment)
10 and 11 relate to a third embodiment of the present invention, FIG. 10 is a side view showing a protruding portion of the distal end portion of the endoscope, and FIG. 11 is a plan view showing an observation image displayed on a monitor. is there.
[0084]
(Constitution)
As shown in FIG. 10, in the protruding portion 238 of the hood member 237 provided at the distal end portion of the endoscope of the present embodiment, the distal end portion of the distal end edge portion 243 is slightly smaller than the inclined surface 48 of the observation visual field region 47. It has a portion 243a formed in a shape overlapping with a small amount. That is, the portion 243 a protrudes from the observation visual field region 47.
[0085]
Then, the overlap amount x of the tip edge portion 243 with respect to the observation field region 47 in the range of the distal value from the center of the observation field in the diagonal direction X shown in FIG. 6 is formed larger than the overlap amount y at other positions. Has been. That is, as shown in FIG. 11, the overlapping amounts x and y are formed so that the amount of the tip edge 243 visible on the observation image 46 is uniform in consideration of the aberration of the observation optical system 34. .
[0086]
(Function)
In the present embodiment, the image is most compressed by the aberration of the observation optical system 34 in the range of the distal value from the center of the observation field in the diagonal direction X shown in FIG. For this reason, as shown in FIG. 11, in the observation image 46 of the monitor 6, the images 243 b and 243 c of the front edge portion 243 that protrude from the diagonal surface 48 in the diagonal direction X and overlap the observation visual field region 47 are compressed. As a result, the images 243b and 243c of the tip edge portion 243 are not significantly different in the appearance on the observation image 46 from the image 243d of the tip edge portion 243 that overlaps the observation visual field region 47 at other positions.
[0087]
For this reason, the protrusion length or thickness of the hood member 237 can be formed with a minimum influence on the observation visual field.
[0088]
(effect)
As described above, according to the present embodiment, the same effects as those of the embodiment shown in FIGS. 1 to 6 are obtained, and the protrusion length of the hood member 237 is further increased or the wall thickness is increased. In addition, it is possible to provide an endoscope apparatus with good insertability or durability.
[0089]
(Fourth embodiment)
FIG. 12 is a plan view showing an observation image displayed on the monitor according to the fourth embodiment of the present invention. The shape of the protrusion at the distal end of the endoscope according to the fourth embodiment will be described with reference to FIG.
[0090]
(Constitution)
In the present embodiment, a shape in which the tip end portion of the tip edge portion 243 overlaps with the slope 48 of the observation visual field region 47 shown in FIG. 10 only in a range from the center of the observation visual field in the diagonal direction X to a slight amount. It has the part currently formed. As a result, as shown in FIG. 12, in the observation image 46 of the monitor 6, images 243b, 243c, and 243e of the leading edge 243 that protrude from the diagonal surface 48 in the diagonal direction X and overlap the observation visual field region 47 are displayed. .
[0091]
(Function)
In the present embodiment, the observation image 46 of the monitor 6 has a high compression rate and the field of view in the diagonal direction X having a large angle of view is slightly reduced, but the compression rate is low and the angle of view is originally small. The protrusion length or thickness of the hood member 237 can be increased without further reducing the visual field of the portion.
[0092]
(effect)
As described above, according to the fourth embodiment, it is possible to provide an endoscope apparatus that has the same effects as those of the third embodiment shown in FIGS. .
[0093]
In the first to fourth embodiments, an endoscope apparatus having observation images as shown in FIGS. 13, 14, 15 and 16 on the assumption that the observation image has a non-circular shape. Applicable in
[0094]
FIG. 13: The observed image 46 is a square or rectangle, and is a substantially quadrangle rounded to the corner.
FIG. 14: A rectangle in which the observation image 46 is displayed on the entire screen of the monitor 6
Figure 15: Roughly quadrangular shape with top and bottom cut off
Figure 16: Rounded top and bottom, left and right side cut out, roughly square
(Fifth embodiment)
FIGS. 17 to 20 relate to a fifth embodiment of the present invention, FIG. 17 is a cross-sectional view showing a hood member, FIG. 18 is a cross-sectional view showing a hood member mounting tool to which the hood member is attached, and FIG. FIG. 20 is a sectional view showing a state in which the hood member is attached to the distal end portion of the endoscope using the hood member wearing tool, and FIG. 20 is a sectional view showing a state in which the hood member wearing tool is removed from the state of FIG.
[0095]
(Constitution)
As shown in FIG. 17, the hood member 50 has a substantially cylindrical shape and is detachable from the distal end portion of the endoscope. The hood member 50 can be formed of a soft member such as a vulcanized rubber such as silicon rubber or fluorine rubber, a thermoplastic elastomer such as a urethane elastomer, an acrylic elastomer or an olefin elastomer, or a hard resin such as polysulfone. . In the present embodiment, the hood member 50 is formed of a soft member.
[0096]
The hood member 50 is provided with a protruding portion 51 and an endoscope fixing portion 52.
The inner diameter of the endoscope fixing portion 52 of the hood member 50 is formed to be substantially the same as or slightly smaller than the outer diameter of the distal end portion 17 of the endoscope shown in FIG. Thereby, the endoscope fixing portion 52 is formed so that the distal end portion 17 can be press-fitted by elastic deformation.
[0097]
As shown in FIG. 18, the hood member mounting tool 53 is for mounting a removable hood member 51 on the distal end portion 17 of the insertion portion of the endoscope.
[0098]
The hood member mounting tool 53 is provided with a hood member fixing portion 54 and a grip portion 55.
[0099]
The outer diameter of the hood member fixing portion 54 is formed substantially the same as the inner diameter of the protruding portion 51. Thereby, the protrusion part 51 can be externally fitted to the hood member fixing part 54.
[0100]
A hood member abutting portion 56 is provided at the base end portion of the hood member fixing portion 54. A tip contact portion 57 is provided on the tip side of the hood member fixing portion 54.
[0101]
The length L11 between the hood member contact portion 56 and the tip portion contact portion 57 allows the amount of the hood member 50 that can be seen in the observation field when the hood member 50 is attached to the tip portion 17, and The optimum amount of protrusion L12 of the protrusion 51 from the tip portion 17 is set so that the effect of the hood member 50 shown in FIG. 20 is maximized.
With such a structure, the hood member abutting portion 56 serves as a hood member regulating means for regulating the position of the hood member 50, and the tip end abutting portion 57 is a tip portion regulating means for regulating the position of the tip portion 17. Thus, the hood member mounting tool 53 regulates the mounting position of the hood member 50 with respect to the distal end portion 17 when the hood member 50 is mounted on the distal end portion.
[0102]
(Function)
When the hood member 50 is attached to the distal end portion 17, as shown in FIG. 18, the hood member fixing portion 54 of the hood member attachment tool 53 is inserted into the protruding portion 51 of the hood member 50, and the hood member abutting portion 56. Until the tip of the protrusion 51 abuts.
[0103]
Next, as shown in FIG. 19, the distal end portion 17 is press-fitted into the endoscope fixing portion 52 of the hood member 50, and inserted until the distal end portion contact portion 57 and the distal end portion 17 abut against each other.
[0104]
When the front end abutting portion 57 and the front end portion 17 come into contact with each other and the hood member abutting portion 56 and the front end of the protruding portion 51 come into contact with each other, the hood member mounting tool 53 is removed from the hood member 50 as shown in FIG.
[0105]
Moreover, you may mount in the following order.
First, an appropriate amount of the distal end portion 17 is press-fitted into the endoscope fixing portion 52 of the hood member 50. Thereafter, the hood member fixing portion 54 of the hood member mounting tool 53 is inserted into the protruding portion 51 of the hood member 50.
[0106]
Next, after adjusting the position of the hood member 50 so that the hood member abutting portion 56 and the tip end portion of the protruding portion 51 abut and the tip portion abutting portion 57 and the tip end portion 17 abut, The mounting tool 53 is removed.
[0107]
As described above, as shown in FIG. 20, the hood member 50 is fixed to the distal end portion 17 with the position in the axial direction being defined at a position where the proper protrusion amount L12 with respect to the distal end portion 17 is obtained.
[0108]
(effect)
As described above, according to the fifth embodiment, the position of the hood member 50 in the axial direction can be specified reliably and easily, and can be attached to the distal end portion 17, and the observation performance is good and the hood member can be easily attached. A hood member mounting tool 53 can be provided.
[0109]
(Sixth embodiment)
FIG. 21 is an explanatory view showing a hood mounting method using the hood member mounting tool according to the sixth embodiment of the present invention.
[0110]
(Constitution)
As shown in FIG. 21, the three types of endoscopes 2a, 2b, and 2c have substantially the same outer diameters at the distal end portions 17a, 17b, and 17c.
[0111]
On the other hand, the tip portions 17a, 17b, and 17c are different in the layout of the observation optical system 34, illumination optical system 35, air / water supply nozzle 18, suction port 19 and the like shown in FIG.
[0112]
Further, it is displayed on the monitor 6 shown in FIG. 1 due to the difference in the configuration of the lens (not shown) constituting the observation optical system 34, the difference in CCD, the display shape of the observation image 46 on the monitor 6 controlled by the video processor 5, and the like. The observation field areas of the observation images are different.
[0113]
For this reason, when one type of hood member 50a is attached to the three types of tip portions 17a, 17b, and 17c, the hood members that can be seen in the observed images are the same when the protruding amount of the protruding portion 51 from the tip portion 17 is the same. The amount of 50a will be different.
[0114]
On the other hand, the hood member 50a can be commonly used for each of the endoscopes 2a, 2b, and 2c.
[0115]
When the hood member 50a is attached to the distal end portions 17a, 17b, and 17c, the optimum projection amount L12 that allows the amount of the hood member 50 visible in the observation image and maximizes the effect of the hood member is an internal Unique in combination with mirrors 2a, 2b, 2c. These are designated L12a, L12b, and L12c, respectively.
[0116]
When the hood member 50a is mounted on these endoscopes 2a, 2b, and 2c, dedicated hood member mounting tools 53a, 53b, and 53c are used.
[0117]
The lengths L11a, L11b, and L11c between the hood member abutting portion 56 and the tip portion abutting portion 57 of the hood member mounting tools 53a, 53b, and 53c are formed to be the same as the protruding amounts L12a, L12b, and L12c, respectively. Has been.
[0118]
The grip portion 55 is provided with display portions 58a, 58b, and 58c in which the names and model numbers of the respective endoscopes, the names and model numbers of the hood members 50a, and the manufacturer names are displayed by molding or printing.
[0119]
(Function)
When wearing the hood member 50a, the contents of the display 58 are confirmed, and a hood member wearing tool corresponding to each endoscope is selected.
[0120]
The mounting procedure is the same as that of the fifth embodiment shown in FIG.
In each of the endoscopes 2a, 2b, and 2c, the hood member 50a is fixed to the distal end portions 17a, 17b, and 17c with the proper protruding amounts L12a, L12b, and L12c, the positions of which are in the axial direction.
[0121]
(effect)
According to such a sixth embodiment, in addition to the same effects as those of the fifth embodiment shown in FIGS. 17 to 20, a common hood member is provided at each of the distal end portions of different endoscopes. It can be installed in the optimal position.
[0122]
(Seventh embodiment)
FIG. 22 is a cross-sectional view showing a state in which the hood member is attached to the distal end portion of the endoscope using the hood member mounting tool according to the seventh embodiment of the present invention. In FIG. 22, the same components as those in the embodiment of FIG. 19 are denoted by the same reference numerals, and description thereof is omitted.
[0123]
(Constitution)
As shown in FIG. 22, the hood member mounting tool 353 is provided with a cylindrical outer diameter regulating portion 59.
[0124]
The inner diameter D1 of the outer diameter restricting portion 59 is substantially the same as the outer diameter D2 of the protruding portion 51 of the hood member 50, and the outer diameter restricting portion 59 is formed so that the protruding portion 51 can be inserted.
[0125]
(Function)
When the hood member 50 is mounted on the hood member mounting tool 353, the protruding portion 51 of the hood member 50 is inserted between the hood member fixing portion 54 and the outer diameter regulating portion 59.
[0126]
Next, as in the case of FIG. 19, the distal end portion 17 is press-fitted into the endoscope fixing portion 52 of the hood member 50, and then the hood member mounting tool 353 is removed from the hood member 50. As a result, as in the case of FIG. 20, the hood member 50 is attached and fixed to the distal end portion 17.
[0127]
FIG. 23 is an explanatory view for explaining the action when the hood member 50 is mounted on the tip portion 17 after being mounted on the hood member mounting tool 353 with the axial direction of the hood member 50 being reversed.
[0128]
As shown in FIG. 23, the endoscope fixing portion 52 of the hood member 50 is inserted between the hood member fixing portion 54 and the outer diameter restricting portion 59, contrary to the original case.
[0129]
In this state, even if the distal end portion 17 is next press-fitted into the protruding portion 51 of the hood member 50, the inner diameter of the protruding portion 51 is smaller than the inner diameter of the endoscope fixing portion 52 and the outer diameter of the distal end portion 17, and Since the deformation of the protruding portion 51 is restricted by the outer diameter restricting portion 59, the protruding portion 51 cannot be increased in diameter, and the distal end portion 17 cannot be press-fitted.
[0130]
Thereby, it can prevent attaching the hood member 50 to the front-end | tip part 17 contrary to the original.
[0131]
FIG. 24 is an explanatory diagram for explaining the operation when the hood member 50 is mistakenly set in the opposite direction and the hood member 50 is first attached to the distal end portion 17.
[0132]
As shown in FIG. 24, an appropriate amount of the distal end portion 17 is press-fitted into the protruding portion 51 of the hood member 50.
[0133]
At this time, the inner diameter of the protruding portion 51 is not appropriate with respect to the outer diameter of the distal end portion 17, but the hood member 50 may be elastically deformed and attached with an increased diameter.
[0134]
Next, when an attempt is made to insert the hood member fixing portion 54 of the hood member mounting tool 353 into the endoscope fixing portion 52 of the hood member 50, the endoscope fixing portion 52 of the hood member 50 is expanded and deformed. Therefore, it hits the outer diameter restricting portion 59 and cannot be inserted.
[0135]
Thereby, it can prevent attaching the hood member 50 to the front-end | tip part 17 in the direction opposite to the original.
[0136]
(effect)
According to such a seventh embodiment, in addition to the same effects as those of the fifth embodiment shown in FIGS. 17 to 20, it is possible to prevent the hood member from being erroneously mounted by reversing the axial direction. .
[0137]
(Eighth embodiment)
25 and 26 relate to the eighth embodiment of the present invention, FIG. 25 is a cross-sectional view showing a closed state of the hood member mounting tool to which the hood member is attached, and FIG. 26 is a state in which the hood member mounting tool is opened. FIG.
[0138]
(Constitution)
As shown in FIGS. 25 and 26, the hood member mounting tool 453 also serves as a packaging container for the hood member 50.
[0139]
The hood member mounting tool 453 has a main body portion 62, a lid-like accommodation portion 63, and a hinge portion 64 that connects them.
[0140]
The hood member mounting tool 453 is formed of a resin member that can be sterilized by ethylene oxide gas sterilization, autoclave sterilization, gamma ray sterilization, or the like. For example, the hood member mounting tool 453 is formed of polystyrene that can be sterilized with ethylene oxide gas.
[0141]
The main body 62 is provided with a hood member fixing portion 54 similar to that shown in FIG. 18, and the hood member 50 is fixed in advance.
[0142]
The outer diameter of the hood member fixing portion 54 is formed to be slightly larger than the inner diameter of the protruding portion 51, and the hood member fixing portion 54 is press-fitted into the protruding portion 51. The protruding portion 51 is fixed to the hood member fixing portion 54 by its own elastic force. The outer diameter of the hood member fixing portion 54 is dimensioned so that the fixing force between the protruding portion 51 and the hood member fixing portion 54 is smaller than the fixing force between the endoscope fixing portion 52 and the distal end portion 17 shown in FIG. Is set. The main body 62 is provided with a hood member abutting portion 56 and a tip end abutting portion 57 similar to those shown in FIG.
[0143]
The main body portion 62 is provided with a convex portion 65, and the housing portion 63 is provided with a locking portion 66 that detachably locks the convex portion 65.
[0144]
In the hood member mounting tool 453, the convex portion 65 is engaged and locked with the locking portion 66, so that the main body portion 62 and the housing portion 63 are locked. As shown in FIG. Is housed.
[0145]
The hood member mounting tool 453 can be sterilized as described above, and is housed in a peel pack or the like that can maintain the sterilized state of the contents for a certain period of time, and is sterilized in this state and delivered to the user.
[0146]
(Function)
When the hood member 50 is attached to the distal end portion 17 shown in FIG. 19, the peel pack is opened, the hood member attachment tool 453 shown in FIG. 25 is taken out, and the main body portion 62 is accommodated as shown in FIG. The locking of the part 63 is released and the hood member 50 is exposed. The hood member mounting tool 453 maintains the sterilized state of the hood member 50 until this time.
[0147]
Next, the distal end portion 17 shown in FIG. 19 is inserted into the endoscope fixing portion 52, and the hood member 50 is positioned and fixed to the distal end portion 17 in the same manner as in the fifth embodiment. Is removed from the hood member 50. At this time, the outer diameter of the hood member fixing portion 54 is set so that the fixing force between the protruding portion 51 and the hood member fixing portion 54 is smaller than the fixing force between the endoscope fixing portion 52 and the distal end portion 17. Therefore, even if the hood member 50 is not gripped with fingers, the hood member mounting tool 453 can be removed from the hood member 50 without the positions of the hood member 50 and the distal end portion 17 being displaced.
[0148]
As described above, the hood member 50 is mounted on the distal end portion 17 without removing the hood member 50 from the hood member mounting tool 453 with a finger and without touching the hood member 50.
[0149]
(effect)
According to such an eighth embodiment, in addition to the same effects as those of the fifth embodiment shown in FIGS. 17 to 20, it is possible to save the trouble of attaching the hood member to the hood member mounting tool before the inspection, It can be installed more easily. In addition, since the hood member is fixed to the hood member mounting tool in advance, it is possible to prevent erroneous mounting of the hood member in the reverse axial direction. Furthermore, the hood member can be easily kept clean until immediately before use of the endoscope.
[0150]
(Ninth embodiment)
FIG. 27 is an explanatory view showing a state when the hood member is attached to the distal end portion of the endoscope using the hood member mounting tool according to the ninth embodiment of the present invention.
[0151]
(Constitution)
As shown in FIG. 27, the ridge line of the distal end contact portion 68 on the distal end side of the protruding portion 551 of the hood member 67 is formed in a petal shape that matches the observation image.
[0152]
A hood member contact portion 556 having substantially the same shape as the distal end contact portion 68 is provided on the proximal end side of the hood member fixing portion 554 of the hood member mounting tool 69.
[0153]
A tip end contact portion 557 is provided on the tip end side of the hood member fixing portion 554. The hood member fixing portion 554 is provided with a columnar rotation direction restricting portion 70 protruding from the tip end contact portion 557.
[0154]
The outer diameter of the rotation direction restricting portion 70 is substantially the same as the inner diameter of the suction port 19 provided at the distal end portion 17, and is formed so as to be fitted to the suction port 19.
[0155]
(Function)
When the hood member 67 is mounted on the hood member mounting tool 69, the tip contact portion 68 of the hood member 67 is positioned so as to correspond to the hood member contact portion 556 having substantially the same shape as the tip contact portion 68. Thus, the tip contact portion 68 and the hood member contact portion 556 are brought into contact with each other. Thereby, the position of the rotation direction of the hood member 67 with respect to the hood member mounting tool 69 is set to a predetermined position.
[0156]
Next, the positions of the hood member mounting tool 69 and the distal end portion 17 in the rotational direction are aligned so that the suction port 19 of the endoscope 2 and the rotational direction restricting portion 70 are fitted, and the distal end portion 17 and the distal end portion abut. The hood member 67 is fixed to the distal end portion 17 at a position where the portion 557 is brought into contact.
[0157]
Accordingly, the position of the hood member 67 and the hood member mounting tool 69 in the rotational direction is restricted by the hood member contact portion 556 and the position in the axial direction is also restricted.
[0158]
On the other hand, the position of the rotation direction is regulated by the fitting of the endoscope fixing portion 552 and the distal end portion 17 and the fitting of the rotation direction regulating portion 70 and the suction port 19. Further, the position in the axial direction is regulated by the contact between the tip end contact portion 557 and the tip end portion 17.
[0159]
As described above, the tip contact portion 68 is attached with the position in the axial direction regulated at a position where the proper protrusion amount L31 with respect to the tip portion 17 is obtained, and the position in the rotational direction regulated in a state corresponding to the observation image. .
[0160]
(effect)
According to the ninth embodiment as described above, the position of the tip contact portion 68 in the axial direction and the rotational direction can be specified and attached to the tip portion 17 with good observation performance, and the hood member can be attached. Can be provided.
[0161]
The rotation direction restricting portion 70 is configured to restrict the rotation direction by engaging with the suction port 19. However, as the rotation direction restricting portion 70, the air / water supply nozzle protruding from the distal end surface of the distal end portion 17. A rotation direction restricting portion that engages with the front end portion 17 may be provided. Thus, a concave portion such as the suction port 19 provided at a position other than the center of the front end surface of the front end portion 17 or an air supply / water supply nozzle 18 may be provided. What is necessary is just to provide the rotation position control part engaged with a convex part.
[0162]
As a result, it is not necessary to provide a restricting portion for restricting the position in the rotation direction on the outer peripheral portion of the tip end portion 17, and it is not necessary to newly provide a complicated restricting portion.
[0163]
Further, since a new configuration for positioning is not required on the endoscope 2 side, it can be applied to the existing endoscope 2 and is highly versatile.
[0164]
In addition, you may provide a recessed part and a convex part in the front-end | tip part 17 separately from the suction port 19 and the air / water supply nozzle 18. FIG. The hood member mounting tool 69 may be configured as in the eighth embodiment.
[0165]
[Appendix]
According to the above-described embodiment of the present invention described in detail above, the following configuration can be obtained.
[0166]
(Additional Item 1) A hood member having a protruding portion that protrudes in the observation visual field direction of the endoscope is provided at the distal end portion of the insertion portion of the endoscope, and the shape of the observation image of the endoscope is a non-circular endoscope In the mirror device,
An endoscope apparatus, wherein a slope portion having a shape corresponding to an observation visual field region of the endoscope is formed at a distal end edge portion of the protruding portion.
[0167]
(Additional Item 2) The endoscope apparatus according to Additional Item 1, wherein the protrusion has at least one notch.
[0168]
(Additional Item 3) The overlapping amount of the protruding portion to the observation visual field region in at least a part of the range far from the center of the observation image is the overlapping amount of the protruding portion to the observation visual field region in the other range. The endoscope apparatus according to any one of appendices 1 and 2, wherein the endoscope apparatus is formed larger than the endoscope.
[0169]
(Additional Item 4) The shape of the observation image is substantially square, and the overlapping amount of the protruding portion to the observation visual field region in the range in the vicinity of at least one corner of the observation image is determined in the vicinity of the side of the observation image. The endoscope apparatus according to appendix 3, wherein the protrusion is formed to be larger than an overlapping amount of the protruding portion to the observation visual field region.
[0170]
(Additional Item 5) In the range in the vicinity of at least one corner of the observation image, the protrusion is placed in the observation visual field region, and in the range in the vicinity of the side of the observation image, the protrusion is in the observation visual field region. The endoscope apparatus according to appendix 4, wherein the projecting portion is formed in a shape that does not fit into the head.
[0171]
(Additional Item 6) The maximum protruding amount of the protruding portion from the most advanced lens surface of the observation optical system is formed to be equal to or longer than the minimum observation depth of the observation optical system. The endoscope apparatus according to any one of the above.
[0172]
(Additional Item 7) The endoscope apparatus according to any one of Additional Items 1 to 6, wherein the hood member is formed to be detachable from a distal end portion of the endoscope.
[0173]
(Additional Item 8) The endoscope apparatus according to Additional Item 7, wherein the hood member is formed so as to be detachable from a distal end portion of the endoscope, and positioning means for positioning the hood member is provided.
[0174]
(Additional Item 9) The endoscope apparatus according to Additional Item 7, wherein the hood member is formed so as to be detachable from a distal end portion of the endoscope, and an index indicating a fixed position thereof is provided.
[0175]
(Additional Item 10) In a hood member mounting tool for mounting a detachable hood member on a distal end portion of an insertion portion of an endoscope,
Hood member regulating means for regulating the position of the hood member;
Tip portion regulating means for regulating the position of the tip portion;
And a mounting position of the hood member with respect to the distal end portion when the hood member is mounted on the distal end portion.
[0176]
(Additional Item 11) The hood member regulating means has a hood member axial regulating part for regulating the axial position of the hood member, and the tip part regulating means regulates the axial position of the tip part. 11. The hood member mounting tool according to additional item 10, wherein the hood member mounting tool has a tip end axial direction regulating portion.
[0177]
(Additional Item 12) The hood member restricting means includes a hood member rotation direction restricting portion that restricts the position of the hood member in the rotation direction, and the tip portion restricting means restricts the position of the tip portion in the rotation direction. The hood member mounting tool according to any one of Additional Items 10 and 11, further comprising a distal end rotation direction restricting portion.
[0178]
(Additional Item 13) The hood according to Additional Item 12, wherein the distal end rotation direction restricting portion is an engaging portion that engages with either a concave portion or a convex portion provided on the distal end surface of the distal end portion. Member mounting tool.
[0179]
(Additional Item 14) The additional point item 13, wherein the distal end rotation direction restricting portion is an engagement portion that engages with a suction port that opens at the distal end portion or a fluid ejection nozzle that protrudes at the distal end portion. Hood member mounting tool.
[0180]
(Additional Item 15) The hood member mounting tool according to any one of Additional Items 10 to 14, further comprising a hood storage portion that stores the hood member.
[0181]
(Additional Item 16) The hood member mounting tool according to any one of Additional Items 10 to 15, further comprising a hood member fixing portion that detachably fixes the hood member.
[0182]
【The invention's effect】
As described above, according to the present invention, it is possible to easily and accurately attach the hood member to the distal end portion of the insertion portion of the endoscope.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an overall configuration of an endoscope apparatus according to a first embodiment of the present invention.
2 is a cross-sectional view of the distal end portion of the first embodiment of FIG. 1;
FIG. 3 is a front view of the distal end portion of the endoscope according to the first embodiment of FIG. 1;
4 is a side view showing a hood member that is detachably connected to the distal end portion of the endoscope according to the first embodiment of FIG. 1; FIG.
FIG. 5 is a plan view showing an observation image displayed on the monitor according to the first embodiment of FIG. 1;
6 is an explanatory diagram showing an observation visual field region when the observation image of FIG. 5 is displayed. FIG.
FIG. 7 is a first explanatory view for explaining the operation of the protrusion of the first embodiment of FIG. 1;
FIG. 8 is a second explanatory view for explaining the operation of the protrusion of the first embodiment of FIG. 1;
FIG. 9 is a side view showing a distal end portion of an endoscope according to a second embodiment of the present invention with a part cut away.
FIG. 10 is a side view showing a protruding portion of a distal end portion of an endoscope according to a third embodiment of the present invention.
FIG. 11 is a plan view showing an observation image displayed on the monitor of the third embodiment in FIG. 10; It is.
FIG. 12 is a plan view showing an observation image displayed on a monitor of an endoscope apparatus according to a fourth embodiment of the present invention.
FIG. 13 is a plan view showing a first example of an observation image having a non-circular shape that can be used in the first to fourth embodiments.
FIG. 14 is a plan view showing a second example of an observation image having a non-circular shape that can be used in the first to fourth embodiments.
FIG. 15 is a plan view showing a third example of an observation image having a non-circular shape that can be used in the first to fourth embodiments.
FIG. 16 is a plan view showing a fourth example of an observation image having a non-circular shape that can be used in the first to fourth embodiments.
FIG. 17 is a cross-sectional view showing a hood member used in a hood member mounting tool according to a fifth embodiment of the present invention.
FIG. 18 is a cross-sectional view showing a hood member wearing tool according to a fifth embodiment of the present invention.
19 is a cross-sectional view showing a state in which the hood member is attached to the distal end portion of the endoscope using the hood member mounting tool of FIG. 18;
20 is a cross-sectional view showing a state in which the hood member mounting tool is removed from the state shown in FIG.
FIG. 21 is an explanatory view showing a hood mounting method using a hood member mounting tool according to a sixth embodiment of the present invention.
FIG. 22 is a cross-sectional view showing a state in which the hood member is attached to the distal end portion of the endoscope using the hood member mounting tool according to the seventh embodiment of the present invention.
FIG. 23 is an explanatory view for explaining the operation when the hood member is mounted on the hood member mounting tool with the axial direction of the hood member being mistaken in the opposite direction in the seventh embodiment of FIG. 22;
FIG. 24 is an explanatory diagram for explaining the operation when the hood member is mounted on the hood member mounting tool while the hood member is mistaken in the opposite axial direction in the seventh embodiment of FIG. 22;
FIG. 25 is a cross-sectional view showing a hood member mounting tool according to an eighth embodiment of the present invention.
26 is a perspective view showing a state where the hood member mounting tool of FIG. 25 is opened.
FIG. 27 is an explanatory view showing a state when the hood member is attached to the distal end portion of the endoscope using the hood member mounting tool according to the ninth embodiment of the present invention.
[Explanation of symbols]
1 ... Endoscopic device
2 ... Endoscope
3 ... Light source device
4 ... Signal cable
5 ... Video processor
6 ... Monitor
7 ... Insertion part
17 ... tip
34. Observation optical system
37 ... Hood member
38 ... Projection
39: Endoscope fixing part
43 ... tip edge
47 ... Observation field of view
48… Slope
49 ... Slope
50: Hood member
53 ... Hood fitting
56 ... Hood member contact portion
57 ... Tip contact portion

Claims (3)

In a hood member mounting tool for mounting a detachable hood member on the distal end of the insertion portion of the endoscope,
Hood member regulating means for regulating the position of the hood member;
A tip restricting means for restricting the position of the tip of the insertion portion;
And a mounting position of the hood member with respect to the distal end portion of the insertion portion when the hood member is mounted on the distal end portion of the insertion portion. The hood member restricting means includes a hood member axial restricting portion that restricts an axial position of the hood member, and the tip restricting means restricts the axial position of the insertion portion distal end. The hood member mounting tool according to claim 1, further comprising an axial restriction portion. The hood member restricting means has a hood member rotation direction restricting portion that restricts the position of the hood member in the rotation direction, and the tip portion restricting means is a tip portion that restricts the position of the insertion portion tip portion in the rotation direction. It has a rotation direction control part, The food | hood member mounting tool of Claim 1 or 2 characterized by the above-mentioned.

Images