JP6387674B2 - Endoscope hood and endoscope with hood - Google Patents

Description

  The present invention relates to an endoscope hood used by being attached to the distal end portion of an endoscope, and an endoscope with a hood to which the endoscope hood is attached.

  Endoscopic mucosal resection (EMR) is performed in which mucosal tissue in a body cavity such as the digestive tract is removed by removing it from the underlying muscle tissue. An endoscope has a plurality of through holes (channels) penetrating in the longitudinal direction. Generally, a long treatment instrument such as a high-frequency knife is inserted into a forceps hole which is a through hole having the largest opening diameter. Then, the treatment tool is operated on the proximal end side of the endoscope to peel and excise the mucosal tissue. Among them, in endoscopic submucosal resection (ESD) in which a wide range of mucous membranes are exfoliated and removed at once, the mucous membrane in the middle of exfoliation is covered with a muscle layer, so the submucosal layer must be removed blindly. There is a difficulty in the procedure that does not become.

  In order to prevent blind cutting procedures in endoscopic submucosal resection, etc., an endoscope hood (hereinafter sometimes simply referred to as “hood”) is attached to the tip of the endoscope. It has been proposed to secure a field of view of an observation optical system such as an objective lens (for example, Patent Documents 1 and 2).

The hood sinks under the mucous membrane to be separated and pushes up the mucous membrane, thereby ensuring the field of view of the observation optical system of the endoscope.
Here, when the body fluid (blood, lymph fluid, tissue fluid, etc.) flowing out from the excision affected part or water sprayed from the endoscope toward the excision affected part adheres to the objective lens, the field of view is impaired and becomes a problem. Therefore, there is a case where a nozzle for water supply is provided at the distal end of the endoscope in order to spray the cleaning liquid toward the objective lens and clean it.

  The body fluid and the cleaning fluid (hereinafter collectively referred to as “liquid”) may accumulate in the hood and interfere with the excision procedure, or may adhere to the objective lens and cause poor visibility in the endoscope. obtain.

  On the other hand, Patent Document 1 proposes an endoscope (hereinafter also referred to as Prior Art 1) including a hood provided with a discharge port through which a liquid can pass in a side wall portion of the hood.

Further, in Patent Document 2, a cylinder including a mounting portion that is detachably mounted on an outer peripheral surface of a distal end portion of an endoscope, and a protruding portion that protrudes forward from the distal end of the mounting portion toward the front of the endoscope. An invention (hereinafter also referred to as Prior Art 2) of a cylindrical endoscope hood (adapter) is disclosed. Prior art 2
The mounting portion includes a drainage groove that opens into an internal space formed by the inner peripheral surface of the protrusion and the distal end surface of the endoscope, and is recessed in the inner peripheral surface toward the proximal end. In addition, the prior art 2 includes at least one drainage hole connected to the drainage groove and penetrating the mounting portion in the thickness direction and communicating with the outer peripheral surface.
According to the related art 2 having such a configuration, the drainage groove and the drainage hole are said to discharge body fluid, water, chemical liquid, and the like attached to the distal end surface of the endoscope to the outside by capillary action. . More specifically, in Patent Document 2 FIG. 1B, the drainage groove extends long from the distal end to the proximal end of the mounting portion of the hood, and the drainage hole is orthogonal to the drainage groove. The form being formed is shown.

Japanese Utility Model Publication No. 56-75912 JP 2008-272168 A

  However, the bodily fluid that has flowed out from the excision affected part has high viscosity and low fluidity. Therefore, in the conventional technique 1, it is difficult to guide the bodily fluid existing inside the hood to the discharge port in the side wall portion of the hood, and it is difficult to discharge quickly and smoothly through the discharge port.

  Moreover, although the structure which guide | induces a liquid to the drainage hole through the drainage groove | channel is employ | adopted for the prior art 2, it is difficult to guide a liquid to the said drainage hole rapidly through the said drainage groove | channel. This is because the path from the drainage groove to the outside through the drainage hole is long and narrow even if the body fluid is satisfactorily introduced into the drainage groove from the inside of the hood by capillary action. Therefore, the body fluid is difficult to be discharged to the outside through the drainage hole, and there is a possibility that the body fluid stays inside the drainage groove and is clogged.

  The present invention has been made in view of the above-described problems, and is an endoscope hood capable of suitably discharging the liquid present in the hood to the outside of the hood, and the endoscope of the present invention. An endoscope with a hood is provided.

The endoscope hood of the present invention has a tubular shape having a proximal end opening, a distal end opening, a mounting portion to which the distal end portion of the endoscope is mounted, and a hood main body portion extending to the distal end side of the mounting portion. The endoscope hood has an inner opening formed on the inner peripheral surface of the endoscope hood and an outer opening formed on the outer peripheral surface of the endoscope hood in the thickness direction. There is a drainage port that penetrates, and at least a part of the inner opening is provided in the hood main body, and the insertion depth of the endoscope is formed on the inner peripheral surface of the endoscope hood. A restricting portion is provided, and the restricting portion protrudes inward in the radial direction and has an abutting portion capable of coming into contact with the inserted endoscope, and the inner side in the proximal direction The contact portion is located in a region where the opening is formed .

  An endoscope with a hood according to the present invention includes the hood for an endoscope according to the present invention, and the endoscope having an observation optical system provided at the distal end portion, and the mounting portion of the endoscope hood. Is characterized in that the observation optical system is attached to the distal end portion of the endoscope at an attachment angle located closer to the inner opening than the axis of the attachment portion.

  According to the endoscope hood and the endoscope with the hood of the present invention, the liquid existing inside the hood can be suitably discharged to the outside of the hood.

It is a top view which shows the endoscope with a hood of 1st embodiment of this invention. It is a front view of an endoscope with a hood. FIG. 3 is a vertical cross-sectional view taken along line III-III in FIG. 1 and shows a state in which mucosal tissue is adsorbed. (A) is a longitudinal cross-sectional view which shows the endoscope with a hood of 2nd embodiment of this invention, (b) is a top view which shows the endoscope with a hood of 2nd embodiment of this invention. . It is a top view which shows the endoscope with a hood of 3rd embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that in all the drawings, the same components are denoted by the same reference numerals, and redundant description will be appropriately omitted.
The various components of the present invention do not need to be individually independent, that a plurality of components are formed as one member, that one component is formed of a plurality of members, It is allowed that a certain component is a part of another component, a part of a certain component overlaps a part of another component, and the like.

The present invention will be described by appropriately defining a side closer to the operator side of the endoscope as a proximal end and a side farther from the operator as a distal end. Further, the direction from the base end side to the tip end side or the direction from the tip end side to the base end side may be appropriately referred to as a tip base end direction.
In describing the present invention, the term “inner peripheral surface” or “outer peripheral surface” may be used as appropriate. Unless otherwise specified, the inner peripheral surface means a surface facing the axis of the endoscope hood 10, and the outer peripheral surface is a surface not facing the axis of the endoscope hood 10. Means.

<First embodiment>
FIG. 1 is a plan view showing an endoscope hood 10 and a hooded endoscope 200 according to this embodiment. FIG. 2 is a front view of the hooded endoscope 200. 3 is a vertical sectional view taken along the line III-III in FIG. 1 and shows a state in which the mucosal tissue TS is adsorbed to the distal end opening 30 of the hood main body 50. FIG.
First, an outline of an endoscope hood 10 (hereinafter also simply referred to as a hood 10) will be described.
In the description of the present embodiment, the body fluid that has flowed into the internal space V from the tip opening 30 and the cleaning liquid that is sprayed from the water supply nozzle 107 toward the observation optical system 105 may be collectively referred to as “liquid”. .

As shown in FIG. 1, the hood 10 of the present embodiment extends to the distal end side of the mounting portion 40, the proximal end opening 20, the distal end opening 30, the mounting portion 40 to which the distal end portion 110 of the endoscope 100 is mounted. And a hood main body 50 that has been taken out.
The hood 10 has an inner opening 51 (see FIG. 3) formed in the inner peripheral surface 31 (see FIG. 3) of the hood 10 and an outer opening 52 formed in the outer peripheral surface 32 of the hood 10 in the thickness direction. A drainage port 60 penetrating therethrough is provided. At least a part of the inner opening 51 is provided in the hood main body 50. In addition, in the hood 10, a drainage groove 70 that communicates with the drainage port 60 is provided along the outer peripheral surface 32 of the hood 10 or the inner peripheral surface 31 a of the hood main body 50.

According to the present embodiment, it is possible to discharge the liquid accumulated in the hood main body 50 to the outside of the hood 10 while continuously circulating the drainage port 60 and the drainage groove 70. The flow direction of the liquid is easily regulated in a predetermined direction, and once the liquid is regulated in the predetermined direction, the liquid is led out to the outside of the hood 10 continuously and quickly. Here, the predetermined direction is, for example, the extending direction of the drainage groove 70.
For this reason, the liquid inside the hood 10 is quickly discharged to the outside of the hood 10 through the drain port 60.

  The drainage groove 70 in the present embodiment does not face the peripheral surface 112 of the endoscope 100 attached to the hood 10 and is open at least on the outer side in the thickness direction. Therefore, it is difficult for the liquid flowing through the drainage groove 70 to be clogged in the drainage groove 70.

  Next, the hood 10 of this embodiment will be described in detail. In the hood 10 according to the present embodiment, the long axis direction of the mounting portion 40 substantially matches the long axis direction of the endoscope 100. That is, as indicated by a one-dot chain line in FIG. 3, the axis AX <b> 1 of the mounting portion 40 indicates the long axis direction of the hood 10. The longitudinal section of the hood 10 shown in FIG. 3 refers to a section obtained by cutting the hood 10 along the long axis direction. In the present embodiment, the mounting portion 40 and the hood main body 50 each have a substantially cylindrical shape, and the axis AX1 of the mounting portion 40 and the axis AX2 of the hood main body 50 intersect each other. The axis AX2 is obtained by approximating a straight line connecting a substantially circular center of gravity obtained by cutting the inner peripheral surface 31a of the hood main body 50 perpendicularly to the axis AX1. However, the present invention is not limited to this, and the mounting portion 40 and the hood main body portion 50 may be arranged on the same axis. In addition, the said cylindrical shape is a cylindrical body, Comprising: A cross section contains circular shape, an ellipse shape, or an oval shape, and the said cylindrical body is a uniform cross-sectional shape, and the cross section of a predetermined location And the case where the shape is different from the cross-sectional shape of other portions.

  An intermediate portion between the mounting portion 40 and the hood main body portion 50 is referred to as a boundary portion 25. The boundary portion 25 is a region having a predetermined spread, and the boundary portion 25 and the mounting portion 40 or the boundary portion 25 and the hood main body portion 50 do not necessarily have to be clearly separated. The boundary portion 25 of the present embodiment is a region including the restriction portion 24 of the inner peripheral surface 31 of the hood 10 and the slope portion 26 of the outer peripheral surface 32 of the hood 10.

FIG. 2 is a front view of the hooded endoscope 200 as viewed from the direction of the axis AX2 of the hood main body 50. FIG.
As shown in FIGS. 1 and 2, the hood 10 according to the present embodiment constitutes an endoscope 200 with a hood together with the endoscope 100.

  As shown in FIG. 2, a water supply nozzle 107 and an observation optical system 105 are provided at the distal end portion 110 of the endoscope 100. The mounting portion 40 of the hood 10 is mounted on the distal end portion 110 of the endoscope 100 at a mounting angle where the observation optical system 105 is positioned closer to the inner opening 51 than the axis AX1 of the mounting portion 40. The positional relationship between the observation optical system 105 and the inner opening 51 can be confirmed by observing the endoscope 100 from the front side.

  The surface constituting the tip portion 110 may be subjected to a hydrophilic treatment. Similarly, hydrophilic treatment may be applied to the peripheral surface 112 (see FIG. 1) on the distal end side of the endoscope 100. The specific hydrophilic treatment is not particularly limited, and as an example, a top coat layer made of a hydrophilic material such as polyvinyl alcohol (PVA) or polyvinyl pyrrolidone (PVP) is formed as a film.

  According to the hooded endoscope 200, the liquid present in the hood main body 50 can be quickly discharged from the drainage port 60, so that the field of view of the observation optical system 105 disposed near the drainage port 60 is good. Secured.

  As shown in FIG. 2, in addition to the observation optical system 105 that is an optical system, a pair of illumination optical system 106, water supply nozzle 107, treatment instrument outlet portion 108, and jetting are provided at the distal end portion 110 of the endoscope 100. A hole 109 or the like is provided as appropriate. In the front view of the hood main body 50, at least one of the observation optical system 105, the illumination optical system 106, the treatment instrument outlet 108, and the injection hole 109 is exposed from the distal end opening 30 of the hood main body 50. In particular, in the present embodiment shown in FIG. 2, all of the observation optical system 105, the illumination optical system 106, the treatment instrument outlet 108, and the injection hole 109 are completely exposed from the distal end opening 30 in the front view of the hood main body 50. The hooded endoscope 200 of the present embodiment is not limited to this.

  A water supply nozzle 107 and an observation optical system 105 are provided at the distal end portion 110 of the endoscope 100. The attachment portion 40 of the endoscope hood 10 is attached to the distal end portion 110 of the endoscope 100 at an attachment angle where the inner opening 51 is positioned on the extension line between the water supply nozzle 107 and the observation optical system 105 (FIG. 2). reference).

  According to the hooded endoscope 200 having such a configuration, when the dirt adhering to the observation optical system 105 is cleaned with a cleaning liquid such as water ejected from the water supply nozzle 107, the cleaning liquid is smoothly discharged to the outside through the inner opening 51. Can be discharged.

  The observation optical system 105 includes a CCD (Charge Coupled Device) camera and observes a subject such as an excision affected part.

  The illumination optical system 106 includes a light guide (not shown) connected to a light source switch (not shown) of the endoscope 100. The illumination optical system 106 irradiates illumination light to the front (front end side) of the endoscope 100.

  The water supply nozzle 107 communicates with a proximal end operation unit (not shown) of the endoscope 100 and ejects a gas such as air or a liquid such as water by operating the proximal end operation unit. Even when the gas is used by being injected exclusively, in this embodiment, it is called the water supply nozzle 107. By ejecting a gas or liquid from the water supply nozzle 107, dirt attached to the distal end portion 110 of the endoscope 100, the observation optical system 105, and the inner peripheral surface 31a of the hood main body portion 50 can be removed.

  The treatment instrument outlet 108 is a tip opening of the forceps hole 120 (see FIG. 3). The treatment tool inserted into the forceps hole 120 protrudes from the treatment tool outlet portion 108 and further protrudes forward from the distal end opening 30 of the hood 10 to peel off and remove the affected part. The proximal end side of the forceps hole 120 is connected to a suction mechanism (not shown) of the endoscope body, and the inside of the forceps hole 120 can be sucked with a negative pressure while the treatment tool is inserted. As a result, the washing water ejected from the water supply nozzle 107 and the injection hole 109 and the body fluid exuded from the excision affected part can be sucked and discharged from the treatment instrument outlet part 108.

  The ejection hole 109 is means for ejecting a liquid such as water toward the front of the excision from the endoscope 100. The ejection hole 109 communicates with a projectile supply port (not shown) on the proximal end side of the endoscope 100, and is connected to liquid supply means such as a pump.

As shown in FIGS. 2 and 3, the tip opening 30 in the present embodiment has an inclined opening 30a and a vertical opening 30b. The inclined opening 30a and the vertical opening 30b respectively constitute end faces on the front end side of the hood main body 50 and intersect each other.
At least a part of the tip opening 30 has an inclined opening 30a having a normal line that is inclined radially outward with respect to the axis AX1 of the mounting portion 40. A drainage port 60 is provided on the side opposite to the normal direction (opening direction) of the inclined opening 30a.
Here, the opening direction is a normal direction of a virtual plane including the tip opening 30, and the opposite side of the opening direction is a direction opposite to the normal direction.
The vertical opening 30b is an end face of the tip opening 30 and is an end face that is substantially perpendicular to the axis AX1.
As shown in FIG. 2, it is preferable that the hood 10 is attached to the endoscope 100 at an attachment angle in which the center of the treatment instrument outlet portion 108 is located inside the inclined opening 30 a in the front view of the hood main body 50. Thereby, it is avoided that the operation of the treatment instrument protruding from the treatment instrument outlet 108 to the distal end side is interfered with the hood main body 50.

  As shown in FIG. 2, when the hood 10 is attached to the endoscope 100 at a mounting angle corresponding to the inclined opening 30 a corresponding to the treatment instrument outlet portion 108, the inner opening 51 is on an extension line between the water supply nozzle 107 and the observation optical system 105. Will be placed naturally. This is because, in the endoscope 100, the treatment instrument outlet portion 108 and the observation optical system 105 are generally arranged on the opposite sides of the distal end portion 110 from the viewpoint of securing the field of view of the observation optical system 105. Thereby, the wash water sprayed from the water supply nozzle 107 toward the observation optical system 105 is suitably discharged from the drain port 60.

The hood main body 50 includes a straight ridge line portion 114 parallel to the axis AX1 of the mounting portion 40, and an inclined ridge line portion 116 that is opposite to the linear ridge line portion 114 and is inclined with respect to the axis AX1. . The drainage port 60 is formed on the inclined ridge line part 116 side in the boundary part 25. The liquid discharged from the drainage port 60 is likely to be discharged in the inclined direction along the inclined ridgeline portion 116.
The fact that the straight ridge line part 114 and the inclined ridge line part 116 are at the opposing positions means that they are located on the opposite side of the hood main body part 50 in the radial direction.

The hood 10 according to the present embodiment has a restricting portion 24 (see FIG. 3) that restricts the insertion depth of the endoscope.
The restricting portion 24 of the present embodiment is a step that decreases in diameter from the mounting portion 40 to the boundary portion 25, and has a contact portion 24 a with which the distal end portion 110 of the endoscope 100 contacts. The endoscope 100 inserted from the proximal end opening 20 is further restricted from being inserted in the distal direction when the distal end portion 110 contacts the contact portion 24a.
In addition, the restricting unit 24 can widely adopt means for restricting the insertion depth of the endoscope 100 with respect to the hood 10 by engaging with the endoscope 100. Specifically, for example, the inner diameter of the hood 10 is continuously increased from the proximal direction toward the distal direction so that the inner diameter of the hood 10 is smaller than the outer diameter of the distal end portion 110 at an intermediate position in the distal direction. The diameter may be reduced.

  The slope portion 26 is formed such that the outer diameter of the hood 10 increases from the proximal end side mounting portion 40 to the distal end side hood main body portion 50. The size in the major axis direction and the dimension in the radial direction of the hood 10 are arbitrary.

  The inner diameter of the mounting portion 40 is configured to be the same as or slightly smaller than the outer diameter of the distal end portion 110 of the endoscope 100. When the inner diameter of the mounting portion 40 is smaller than the outer diameter of the distal end portion 110 of the endoscope 100, the inner diameter of the mounting portion 40 is expanded by the inserted distal end portion 110, and the inner periphery of the mounting portion 40 is the outer periphery of the distal end portion 110. Can adhere well. Further, the inner diameter of the hood main body 50 is smaller than the outer diameter of the distal end portion 110 of the endoscope 100. For this reason, when the endoscope 100 is inserted deeply into the mounting portion 40, the distal end portion 110 comes into contact with the restricting portion 24 as shown in FIG. A forceps hole 120 is formed in the endoscope 100 along the long axis direction. In the distal end portion 110 of the endoscope 100, the forceps hole 120 does not interfere with the restriction portion 24, and the entire forceps hole 120 is exposed in the internal space V of the hood main body portion 50. A treatment tool (not shown) such as a high-frequency knife or an injection needle is inserted into the forceps hole 120 so as to advance and retract.

  The hood main body 50 and the mounting portion 40 are made of a soft resin material. In the present embodiment, the hood main body 50 and the mounting portion 40 are integrally molded as one material. Examples of the soft resin material include, but are not limited to, styrene-based elastomers, silicone rubber, polyurethane, and polyvinyl chloride. The hardness of the soft resin material is not particularly limited, and when the hood 10 comes into contact with the body tissue, the hardness is such that the body tissue is not damaged and the field of view of the observation optical system can be secured during the resection procedure. Those are appropriately selected. In particular, with respect to the hood 10 having the drainage groove 70, for example, from the viewpoint that the hood 10 in contact with the affected area maintains a good shape during the resection procedure, for example, the durometer hardness is A25 degrees or more and A65 degrees or less. Is more preferable, and it is more preferably A40 degrees or more and A50 degrees or less.

  It is preferable that at least the inner peripheral surface 31a of the hood main body 50 is subjected to a hydrophilic treatment. Thereby, water, body fluid, or the like that has entered the inside of the hood main body 50 can be easily discharged from the distal end opening 30 and the drainage port 60, and the field of view of the endoscope 100 can be effectively secured. In the hood 10 of this embodiment, it is preferable that the peripheral surface that defines the drainage port 60 is also subjected to hydrophilic treatment. As a result, water and body fluid are easily discharged through the drain port 60.

  The hydrophilic treatment is not particularly limited, but for example, film formation by a gas phase method such as sputtering or vapor deposition, film formation by a liquid phase method such as dipping coating or spin coating, a cloth based on a hydrophilic film, cloth, absorbent cotton, etc. For example, a method of forming a film to be applied, a plasma treatment for hydroxylating the surface, or the like can be used.

  Hereinafter, the drain port 60 will be described in detail. As described above, the drainage port 60 has the inner opening 51 and the outer opening 52 and penetrates in the thickness direction of the hood 10. The peripheral surface that defines the drainage port 60 in the present embodiment is substantially perpendicular to the axis AX1. Although not shown, the peripheral surface defining the drainage port 60 may be inclined with respect to the axis AX1 in the longitudinal cross section (that is, the cross section observed in FIG. 3).

As shown in FIG. 3, the inner opening 51 is formed across the mounting part 40 and the hood main body part 50.
The hood 10 has a restricting portion 24 that restricts the insertion depth of the endoscope 100, and the peripheral surface 112 of the distal end portion 110 of the endoscope 100 whose insertion depth is restricted by the restricting portion 24 is opened inside. A drainage port 60 is formed so as to partially block 51.
In other words, the inner opening 51 is formed including the boundary portion 25 that is a boundary region between the mounting portion 40 and the hood main body portion 50.

The restricting portion 24 in the present embodiment has an abutting portion 24a that protrudes inward in the radial direction and can abut against the inserted endoscope 100. As shown in FIG. 3, in this embodiment, the contact part 24a is located in the formation area of the inner opening 51 in the distal end direction.
Thereby, the drainage port 60 is configured such that the inner opening 51 is partially blocked by the peripheral surface 112 of the distal end portion 110 of the endoscope 100 whose insertion depth is restricted by the restriction portion 24.

  The peripheral surface 112 of the distal end portion 110 of the endoscope 100 partially blocks the inner opening 51 of the drainage port 60, thereby reducing the substantial opening area of the inner opening 51 and causing capillary action while causing the capillary phenomenon. The liquid existing in the internal space V of the hood main body 50 can be introduced into the drainage port 60 by using the wettability of the peripheral surface 112 of the mirror 100. At this time, the peripheral surface 112 is preferably subjected to hydrophilic treatment. The peripheral surface 112 of the hydrophilic endoscope 100 is exposed in the inner opening 51.

  The drainage port 60 may be substantially formed entirely in the boundary portion 25 of the hood 10. The drainage port 60 of the present embodiment is a straight tubular through-hole drilled in a region including the boundary portion 25.

As shown in FIG. 1, the drainage port 60 of this embodiment is an independent hole. However, the present invention is not limited to this, and the drain port 60 may be a plurality of independent holes that are not in communication with each other (not shown).
The shapes of the outer opening 52 and the inner opening 51 are not particularly limited, and may be a substantially oval shape such as a circular shape, an oval shape, an elliptical shape, or a rounded slit shape, an indefinite shape, or an arbitrary shape. Moreover, when a some hole is provided as the drainage port 60, the inner side opening 51 and the outer side opening 52 which comprise a mutual hole may differ for every hole, and may be the same.

As shown in FIG. 1, the outer opening 52 in the present embodiment has a width expansion region 54 in which the opening width 53 in the circumferential direction increases from the distal opening 30 side toward the proximal opening 20 side.
When the liquid discharged from the drainage port 60 flows in the distal direction, there is a possibility that the liquid again flows into the hood 10 from the distal opening 30. On the other hand, according to the shape of the outer opening 52, the flow of the liquid discharged from the inside of the hood 10 through the drain port 60 can be easily regulated in the proximal direction while avoiding the distal direction.
In the present embodiment, the inner opening 51 also has the width expansion region 54 described above.

The opening width 53 of the outer opening 52 in the width expansion region 54 continuously increases from the distal end of the outer opening 52 toward the proximal end in the proximal direction.
For example, as shown in FIG. 1, the tip of the width expansion region 54 is V-shaped and narrowed. Thereby, the capillary phenomenon of the liquid flowing in the thickness direction is attracted, and the liquid can be easily discharged from the inside of the hood 10 to the outside of the hood 10.

As shown in FIG. 1, the hood 10 according to the present embodiment is configured such that the width expansion region 54 is opposed to the peripheral surface 112 of the endoscope 100 that blocks a part of the inner opening 51 in the radial direction. .
That is, in plan view, at least a part of the width expansion region 54 and the peripheral surface 112 of the endoscope 100 that closes a part of the inner opening 51 overlap in the viewing direction.
Thereby, the liquid discharged from the narrowed inner opening 51 partially blocked by the peripheral surface 112 is easily guided in the direction in which the opening width 53 increases along the peripheral surface 112 blocking the inner opening 51.

The outer opening 52 in the present embodiment has a width reduction region 55 in which the opening width 53 in the circumferential direction is reduced from the middle in the tip base end direction to the base end.
For example, in the width reduction region 55 shown in FIG. 1, the base end of the outer opening 52 is gently convex in the base end direction. In a plan view, the base end of the line defining the outer opening 52 and the vicinity of the base end are V-shaped with the base end as a vertex. Although not shown, the base end of the outer opening 52 forming the V-shaped tip may be two or more. In plan view, the base end of the line defining the outer opening 52 and the vicinity of the base end are W It may be shaped like a letter.
In the present embodiment, the inner opening 51 also has the width reduction region 55 described above.

  The opening width 53 of the outer opening 52 in the width reduction region 55 is continuously reduced from the front end to the base end.

As described above, according to the outer opening 52 having the width reduction region 55, it is possible to collect the discharged liquid in the direction in which the opening width 53 is reduced. The collected liquid is pushed by the liquid further discharged from the liquid discharge port 60, and is easily discharged to the outside of the hood 10 from the outer opening 52 in the shrinking direction.
In particular, in the present embodiment, in plan view, at least a part of the width reduction region 55 overlaps with the peripheral surface 112 of the endoscope 100 that covers a part of the inner opening 51 in the viewing direction, and is discharged from the inner opening 51. The liquid thus easily flows in the direction in which the opening width 53 decreases along the peripheral surface 112.

  The width expansion region 54 and the width reduction region 55 are continuously provided from the front end to the base end. In addition, a region where the opening width 53 does not substantially change may be provided between the width expansion region 54 and the width reduction region 55.

Next, details of the drainage groove 70 will be described.
The drainage groove 70 is a bottomed or bottomless continuous groove provided along the outer peripheral surface 32 of the hood 10 or the inner peripheral surface 31 a of the hood main body 50. For example, the drainage groove 70 is a long and continuous recess.

  At least a part of the drainage groove 70 may have a bottomed region that is bottomed. Having a bottomed region is desirable from the viewpoint of maintaining the shape of the hood 10 formed of a soft resin.

As shown in FIGS. 1 and 3, the hood 10 according to the present embodiment has a first drainage groove 70 a provided on the outer peripheral surface 32 of the endoscope hood 10 as the drainage groove 70.
The first drain groove 70 a can regulate the liquid discharged from the drain port 60 in a predetermined direction without staying around the outer opening 52. Therefore, the liquid can be led out to the outside of the hood 10 for endoscope through the drainage port 60 continuously and rapidly.

The drainage groove 70 (first drainage groove 70 a) in the present embodiment extends toward the proximal end opening 20.
Thereby, the flow of the liquid discharged from the liquid discharge port 60 can be regulated to the proximal end side, and the discharged liquid enters the inside of the hood 10 again from the distal end opening 30 of the hood 10. Is suppressed.
In addition, since the proximal end opening 20 of the hood 10 is substantially blocked by the distal end portion 110 of the endoscope 100, a large amount of liquid flowing from the proximal end opening 20 into the hood 10 is avoided. The

As shown in FIG. 1, the drainage groove 70 (first drainage groove 70 a) provided on the outer peripheral surface 32 of the endoscope hood 10 communicates with the width reduction region 55.
Thereby, the liquid is easily led out of the outer opening 52 through the width reduction region 55. For example, the first drainage groove 70 a communicates with a region including the base end of the width reduction region 55, so that the liquid discharged from the inner opening 51 and concentrated at the base end is smoothly led out of the outer opening 52. High effect.

Further, the endoscope hood 10 has a second drainage groove 70b provided along the inner peripheral surface 31a of the hood main body 50 as the drainage groove 70 (see FIGS. 1 and 3). The second drainage groove 70 b communicates with the drainage port 60 and the tip opening 30 along the inner peripheral surface 31 a of the hood main body 50. The second drainage groove 70 b guides the liquid present in the hood main body 50 to the drainage port 60 satisfactorily.
For example, when the hooded endoscope 200 is used in a posture in which the tip thereof is directed downward in the center of gravity direction, the liquid is transferred from the inside of the hood main body 50 to the outside through the second drainage groove 70b. Can be derived.
Although not shown in the drawings, the second drainage groove 70 b may extend from the drainage port 60 along the inner peripheral surface 31 a of the hood main body 50 in the distal direction, and terminate before reaching the distal end opening 30. .

In the above, the drainage port 60 and the drainage groove | channel 70 connected to this were demonstrated. The hood 10 has at least one drainage groove 70. The present embodiment is an aspect having either the first drainage groove 70a or the second drainage groove 70b, an aspect having two or more first drainage grooves 70a or two or more second drainage grooves 70b, the first An embodiment having a drainage groove 70 other than the drainage groove 70a and the second drainage groove 70b is included.
In the above description, it has been variously described that the liquid flow can be regulated in a predetermined direction by providing the drainage groove 70. The description is not limited to restricting all the flow of the liquid passing through the drain port 60 in a predetermined direction. The flow of at least a part of the liquid discharged to the outside of the hood 10 through the drain port 60 may be restricted in a predetermined direction.

(Second embodiment)
Fig.4 (a) is a longitudinal cross-sectional view which shows the endoscope 200 with a hood of 2nd embodiment. The cutting line is the same as the III-III line shown in FIG. FIG. 4B is a plan view showing the hooded endoscope 200 according to the second embodiment. The present embodiment is different from the first embodiment in the points described below, and the configuration of the first embodiment can be adopted as appropriate for other configurations of the present embodiment.

As shown in FIGS. 4A and 4B, the drainage groove 70 in the present embodiment communicates with the drainage port 60 and has a deep groove region having a deep groove portion 80 formed deeper than the drainage groove 70. 82. In the drainage groove 70 provided with the deep groove region 82, a bottomed region 84 is provided continuously to the deep groove region 82.
In the present embodiment, the bottomed region 84 communicates with the deep groove region 82 and the proximal end opening 20. The deep groove region 82 is provided in the drainage groove 70 provided in the outer peripheral surface 32 of the hood 10. The deep groove portion 80 includes both a case with a bottom and a case with no bottom (that is, a case where the deep groove 80 penetrates in the thickness direction).

The deep groove portion 80 induces a liquid capillary action. That is, the liquid discharged from the drainage port 60 is effectively attracted to the capillary action by the deep groove portion 80, and is smoothly led out to the bottomed region 84 of the drainage groove 70 through the deep groove region 82. The preferable flow of the liquid in the deep groove region 82 induces the discharge of the other liquid existing in the hood main body portion 50 from the liquid discharge port 60.
The aspect in which the deep groove portion 80 is bottomed is desirable because the strength of the deep groove region 82 is ensured well. In addition, when the deep groove portion 80 penetrates in the thickness direction, the capillarity attraction effect by providing the deep groove portion 80 is particularly good.

  As shown in FIGS. 4A and 4B, the deep groove region 82 in the present embodiment is a deep groove portion 80 that is cut from the bottom of the bottomed drainage groove 70 so as to penetrate the thickness direction. have. Although not shown in the drawings, the deep groove region 82 may be formed of a deep groove portion 80 that is a cut in which the cut surface substantially abuts in the entire region in the thickness direction.

(Third embodiment)
FIG. 5 is a plan view showing a hooded endoscope 200 according to a third embodiment of the present invention. The present embodiment is different from the first embodiment in the points described below, and the configuration of the first embodiment can be adopted as appropriate for other configurations of the present embodiment.

  As shown in FIG. 5, the present embodiment includes a third drainage groove 70 c extending from the outer opening 52 in the circumferential direction of the outer peripheral surface 32 of the hood 10 as the drainage groove 70.

  By providing the third drainage groove 70 c, the liquid discharged from the drainage port 60 is regulated in the circumferential direction along the outer peripheral surface 32. For example, when the procedure is performed at a position where the drainage port 60 opens toward the upper side in the weight direction in the body, the flow of the liquid discharged from the drainage port 60 is passed through the third drainage groove 70c. Easy to regulate to the lower side in the weight direction.

For example, the third drainage groove 70 c may be a circumferentially continuous groove having one end communicating with one region of the drainage port 60 and the other end communicating with another region of the drainage port 60.
Alternatively, the third drainage groove 70c may have one end communicating with one region of the drainage port 60, extending in the circumferential direction of the outer peripheral surface 32, and terminating at an arbitrary location.
In the present embodiment, the third drainage groove 70 c communicates with the drainage port 60 including the boundary between the width expansion region 54 and the width reduction region 55 (see FIG. 1) provided continuously in the proximal direction. Also good. The boundary protrudes in the circumferential direction in the middle of the drainage port 60 in the front end direction.

The first to third embodiments of the present invention have been described above. The present invention is not limited to the above-described embodiment, and includes various modifications and improvements as long as the object of the present invention is achieved. The matters described in each embodiment can be applied to other embodiments as appropriate.
Moreover, in each embodiment mentioned above, although the depth direction of the drainage port 60 showed the aspect orthogonal to the axial center AX1, this invention is not limited to this, The depth of the drainage port 60 is shown. The direction can be changed as appropriate.

The above embodiment includes the following technical idea.
(1) A cylindrical endoscope hood having a proximal end opening, a distal end opening, a mounting portion to which a distal end portion of the endoscope is mounted, and a hood main body extending to the distal end side of the mounting portion. There,
A drain opening that penetrates in the thickness direction with an inner opening formed on the inner peripheral surface of the endoscope hood and an outer opening formed on the outer peripheral surface of the endoscope hood;
At least a part of the inner opening is provided in the hood main body,
An endoscope hood, wherein a drainage groove communicating with the drainage port is provided along the outer peripheral surface of the endoscope hood or the inner peripheral surface of the hood main body.
(2) While having a restricting portion that restricts the insertion depth of the endoscope, the inner opening is formed across the mounting portion and the hood main body portion,
The inner side according to (1), wherein the drainage port is formed such that a peripheral surface of the distal end portion of the endoscope whose insertion depth is regulated by the regulating portion partially blocks the inner opening. Endoscopic hood.
(3) A restriction portion for restricting the insertion depth of the endoscope is provided on the inner peripheral surface of the endoscope hood,
The restricting portion has a contact portion that protrudes inward in the radial direction and can contact the inserted endoscope.
The endoscope hood according to (1), wherein the contact portion is located in a region where the inner opening is formed in the distal direction.
(4) The endoscope hood according to any one of (1) to (3), wherein the drainage groove is provided on the outer peripheral surface of the endoscope hood.
(5) The endoscope hood according to (4), wherein the drainage groove extends toward the proximal end opening.
(6) The outer side opening according to any one of (1) to (5), wherein an opening width in a circumferential direction has a width expansion region in which the opening width increases from the distal end opening side toward the proximal end opening side. The endoscope hood as described.
(7) In the above (6) subordinate to the above (2) or (3) in which the width-enlarging region and the peripheral surface of the endoscope that blocks a part of the inner opening are opposed to each other in the radial direction. The endoscope hood as described.
(8) The endoscope according to any one of (1) to (7), wherein the outer opening has a width reduction region in which an opening width in a circumferential direction is reduced from an intermediate position in a distal base end direction to a base end. For hood.
(9) The endoscope hood according to (8), wherein the drainage groove provided on the outer peripheral surface of the endoscope hood communicates with the width reduction region.
(10) The endoscope hood according to any one of (1) to (9), wherein at least a part of the drainage groove has a bottomed region that is bottomed.
(11) The drainage groove has a deep groove region that has a deep groove portion that communicates with the drainage port and is formed deeper than the drainage groove, and has the bottomed region continuously to the deep groove region. The endoscope hood as described in (10) above.
(12) The endoscope according to any one of (1) to (9), wherein the drainage groove extends in a circumferential direction of the outer peripheral surface of the endoscope hood from the outer opening. hood.
(13) At least a part of the tip opening has an inclined opening having a normal line inclined radially outward with respect to the axial center of the mounting portion, and on the opposite side of the normal direction of the inclined opening. The endoscope hood according to any one of (1) to (12), wherein the drainage port is provided.
(14) The hood head includes: a straight ridge line portion parallel to the axis of the mounting portion; and an inclined ridge line portion that is opposed to the linear ridge line portion and is inclined with respect to the axis. The endoscope hood according to any one of (1) to (13), wherein a liquid port is formed on the inclined ridge line portion side in the boundary portion.
(15) A hooded endoscope comprising the endoscope hood according to any one of (1) to (14) above and the endoscope.
(16) A water supply nozzle and an observation optical system are provided at the distal end portion of the endoscope,
The mounting portion of the endoscope hood is mounted on the distal end portion of the endoscope at a mounting angle where the observation optical system is positioned closer to the inner opening than the axis of the mounting portion (15 ) Endoscope with a hood.
(17) A water supply nozzle and an observation optical system are provided at the distal end portion of the endoscope,
The attachment part of the endoscope hood is attached to the distal end part of the endoscope at an attachment angle where the inner opening is positioned on an extension line between the water supply nozzle and the observation optical system (15 ) Or a hooded endoscope according to (16).

DESCRIPTION OF SYMBOLS 10 ... Endoscope hood 20 ... Base end opening 24 ... Restriction part 24a ... Contact part 25 ... Boundary part 26 ... Slope part 30 ... End opening 30a ... -Inclined opening 30b-Vertical opening 31-Inner peripheral surface 31a-Inner peripheral surface 32-Outer peripheral surface 40-Mounting part 50-Hood main body 51-Inner opening 52- ..Outside opening 53... Opening width 54... Widened region 55... Width reduced region 60 .. drainage port 70 .. drainage groove 70a. Second drain groove 70c ... Third drain groove 80 ... Deep groove portion 82 ... Deep groove region 84 ... Bottomed region 100 ... Endoscope 105 ... Observation optical system 106 ..Illumination optical system 107... Water supply nozzle 108 .. treatment instrument outlet 109... Injection hole 110. .... Straight ridge line part 116 ... Inclined ridge line part 120 ... Forceps hole 200 ... Hooded endoscope AX1 ... Axis center AX2 ... Axis center TS ... Mucosal tissue V ... Inside space

Claims (17)

A cylindrical endoscope hood having a proximal end opening, a distal end opening, a mounting portion to which a distal end portion of the endoscope is mounted, and a hood main body extending to the distal end side of the mounting portion,
A drain opening that penetrates in the thickness direction with an inner opening formed on the inner peripheral surface of the endoscope hood and an outer opening formed on the outer peripheral surface of the endoscope hood;
At least a part of the inner opening is provided in the hood main body,
A drainage groove communicating with the drainage port is provided along the outer peripheral surface of the endoscope hood or the inner peripheral surface of the hood main body ,
A restriction part for restricting the insertion depth of the endoscope is provided on the inner peripheral surface of the endoscope hood,
The restricting portion has a contact portion that protrudes inward in the radial direction and can contact the inserted endoscope.
An endoscope hood , wherein the contact portion is located in a region where the inner opening is formed in the distal direction . A cylindrical endoscope hood having a proximal end opening, a distal end opening, a mounting portion to which a distal end portion of the endoscope is mounted, and a hood main body extending to the distal end side of the mounting portion,
A drain opening that penetrates in the thickness direction with an inner opening formed on the inner peripheral surface of the endoscope hood and an outer opening formed on the outer peripheral surface of the endoscope hood;
At least a part of the inner opening is provided in the hood main body,
A drainage groove communicating with the drainage port is provided along the outer peripheral surface of the endoscope hood or the inner peripheral surface of the hood main body ,
The endoscope hood according to claim 1, wherein the outer opening has a width expansion region in which an opening width in a circumferential direction increases from the distal opening side toward the proximal opening side . While having a restricting portion that restricts the insertion depth of the endoscope, the inner opening is formed across the mounting portion and the hood main body portion,
The endoscope according to claim 2 , wherein the drainage port is formed such that a peripheral surface of the distal end portion of the endoscope whose insertion depth is regulated by the regulating portion partially blocks the inner opening. Mirror hood. A restriction part for restricting the insertion depth of the endoscope is provided on the inner peripheral surface of the endoscope hood,
The restricting portion has a contact portion that protrudes inward in the radial direction and can contact the inserted endoscope.
The endoscope hood according to claim 2 , wherein the contact portion is located in a region where the inner opening is formed in the distal direction. The endoscope hood according to claim 3 or 4 , wherein the widened region and a peripheral surface of the endoscope that covers a part of the inner opening face each other in a radial direction. A cylindrical endoscope hood having a proximal end opening, a distal end opening, a mounting portion to which a distal end portion of the endoscope is mounted, and a hood main body extending to the distal end side of the mounting portion,
A drain opening that penetrates in the thickness direction with an inner opening formed on the inner peripheral surface of the endoscope hood and an outer opening formed on the outer peripheral surface of the endoscope hood;
At least a part of the inner opening is provided in the hood main body,
A drainage groove communicating with the drainage port is provided along the outer peripheral surface of the endoscope hood or the inner peripheral surface of the hood main body ,
The endoscope hood according to claim 1, wherein the outer opening has a width reduction region in which the opening width in the circumferential direction is reduced from the middle in the distal base end direction to the base end . The endoscope hood according to claim 6 , wherein the drainage groove provided in the outer peripheral surface of the endoscope hood communicates with the width reduction region. A cylindrical endoscope hood having a proximal end opening, a distal end opening, a mounting portion to which a distal end portion of the endoscope is mounted, and a hood main body extending to the distal end side of the mounting portion,
A drain opening that penetrates in the thickness direction with an inner opening formed on the inner peripheral surface of the endoscope hood and an outer opening formed on the outer peripheral surface of the endoscope hood;
At least a part of the inner opening is provided in the hood main body,
A drainage groove communicating with the drainage port is provided along the outer peripheral surface of the endoscope hood or the inner peripheral surface of the hood main body ,
At least a part of the drainage groove has a bottomed region that is bottomed,
The drainage groove has a deep groove region having a deep groove portion communicating with the drainage port and formed deeper than the drainage groove, and has the bottomed region continuously to the deep groove region. Endoscope hood. The endoscope hood according to any one of claims 1 to 8 , wherein the drainage groove is provided in the outer peripheral surface of the endoscope hood. The endoscope hood according to any one of claims 1 to 9 , wherein the drainage groove extends in the circumferential direction of the outer peripheral surface of the endoscope hood from the outer opening. A cylindrical endoscope hood having a proximal end opening, a distal end opening, a mounting portion to which a distal end portion of the endoscope is mounted, and a hood main body extending to the distal end side of the mounting portion,
A drain opening that penetrates in the thickness direction with an inner opening formed on the inner peripheral surface of the endoscope hood and an outer opening formed on the outer peripheral surface of the endoscope hood;
At least a part of the inner opening is provided in the hood main body,
It said distal end opening and the drainage groove communicating with said drain port is pre Symbol endoscope hood, characterized in that provided along the inner peripheral surface of the hood main body. The endoscope hood according to any one of claims 1 to 11 , wherein at least a part of the drainage groove has a bottomed region that is bottomed. At least a part of the tip opening has an inclined opening having a normal line inclined radially outward with respect to the axis of the mounting portion;
The endoscope hood according to any one of claims 1 to 12, wherein the drainage port is provided on a side opposite to the normal direction of the inclined opening. A boundary portion is provided between the mounting portion and the hood main body portion,
The hood the body portion comprises a axis parallel to the linear ridge portion of the mounting portion, and a sloped ridge portion inclined In the opposite position with respect to the axis of the linear ridge portion, the drainage The endoscope hood according to any one of claims 1 to 13, wherein a mouth is formed on a side of the inclined ridge line portion in the boundary portion.   An endoscope with a hood comprising the endoscope hood according to any one of claims 1 to 14, and the endoscope. The distal end portion of the endoscope is provided with a water supply nozzle and an observation optical system,
16. The mounting portion of the endoscope hood is mounted on the distal end portion of the endoscope at a mounting angle where the observation optical system is positioned closer to the inner opening than the axis of the mounting portion. A hooded endoscope according to 1. The distal end portion of the endoscope is provided with a water supply nozzle and an observation optical system,
16. The attachment portion of the endoscope hood is attached to the distal end portion of the endoscope at an attachment angle at which the inner opening is positioned on an extension line between the water supply nozzle and the observation optical system. Or a hooded endoscope according to 16;

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