JP2010063721A - Hood for endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain a hood for an endoscope which improves the operability of a treatment tool by giving an appropriate degree of freedom to the forward and backward movement directions of the treatment tool. <P>SOLUTION: The hood for the endoscope detachably attached to the tip of the insertion tube of the endoscope includes a holding member 12. The holding member 12 has a plate-like stretchable area 16 and a non-stretchable area 18. The non-stretchable area 18 is thicker than the stretchable area 16. Consequently, when forceps 60 advances and retreats in a passing hole 12M, the stretchable area 16 alone expands and shrinks. The forceps 60 inserted into the passing hole 12M turns to face the direction indicated by an arrow A when coming into contact with the holding member 12 inside the tip face 22 and turns to face the direction indicated by an arrow B when further inserted. Thus by making the direction of the forceps 60 advancing and retreating in the passing hole 12M turnable to a prescribed direction alone, the operability of the treatment tool such as the forceps 60 is improved. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an endoscope hood, and more particularly to an endoscope hood that can be attached to the distal end of an insertion tube of an endoscope.

  When observing an affected part or the like in the body of a subject with an endoscope apparatus, it is generally possible to treat the affected part with forceps or the like extending from the distal end surface of an insertion tube inserted into a body cavity. The treatment tool including the forceps and the like is advanced and retracted from the distal end surface through an insertion channel provided in the insertion tube by a user operation.

In some cases, a hood for endoscopic observation or assisting in the treatment of an affected area may be attached to the distal end of an insertion tube of an endoscope that can use a treatment tool. By using the hood, for example, it is possible to observe and treat the affected area while maintaining a constant distance from the distal end surface of the insertion tube to the object to be observed such as the affected area, or to easily remove the affected area by sucking the affected area. Become. As such a hood, there is known a hood (for example, Patent Document 1) in which a locking portion is provided around a passage for advancing and retreating the treatment tool to prevent the treatment tool from being taken out excessively.
JP 2007-82767 A

  The hood provided with the locking portion around the passage through which the treatment tool passes allows the treatment tool to advance and retreat only up to a predetermined range and restricts the direction of advancement and retraction, thereby reducing the operability of the treatment tool. In particular, for example, a treatment tool used for excision of an affected part may require an operation of moving in a direction other than the longitudinal direction (axial direction) of the insertion tube of the endoscope. For this reason, in the case of a hood that includes a locking portion that is limited in the forward / backward direction as described above, the operability may be greatly reduced.

  An object of this invention is to implement | achieve the endoscope hood which gives a suitable freedom degree to the advancing / retreating direction of a treatment tool, and improves the operativity of a treatment tool.

  The endoscope hood of the present invention is detachably attached to the distal end of the insertion tube of the endoscope. The endoscope hood is provided with a passage hole through which the treatment instrument passing through the insertion tube is slidably advanced and retracted, and is an area for holding the treatment instrument around the passage hole. And a non-stretchable region that is less stretchable than the stretchable region. The endoscope hood moves toward the non-stretchable region due to the expansion of the stretchable region when the treatment tool is inserted into the passage hole, and the stretchable region shrinks to the original shape when retracted from the passage hole. It turns so that it may return to the direction before insertion.

  The stretchable region and the non-stretchable region are plate-like, and the non-stretchable region is preferably thicker than the stretchable region. In the extension / contraction region, it is preferable that a groove for extension / contraction by the advancement / retraction of the treatment instrument is provided. In this case, it is more preferable that the stretchable region stretches in a direction perpendicular to the longitudinal direction of the groove and parallel to the direction in which the passage hole extends. The stretchable region has, for example, a bellows portion, and a peak of the bellows portion is perpendicular to the central axis of the holding member.

  It is preferable that the endoscope hood includes a holding member having a truncated cone shape having a telescopic region and a non-stretchable region and having a tapered distal end located on the side opposite to the base end of the endoscope hood. . In this case, the inner diameter at the distal end of the holding member is more preferably smaller than the diameter of the treatment instrument.

  The treatment tool is preferably turned away from the central axis of the holding member when inserted into the passage hole.

  The endoscope hood further includes a plate-like member that separates the proximal end portion of the endoscope hood attached to the insertion tube and the holding member, and in the plate-like member, fluid flows into the insertion tube from the outside of the plate-like member. It is preferable that a suction hole is provided for sucking. In this case, it is more preferable that the suction hole communicates with the passage hole, and the holding member protrudes from the plate-like member, and the suction hole is located inside the joint portion between the holding member and the plate-like member. More preferably, it is provided on the center side of the endoscope hood.

  ADVANTAGE OF THE INVENTION According to this invention, the hood for endoscopes which gives a suitable freedom degree to the advancing / retreating direction of a treatment tool and improves the operativity of a treatment tool is realizable.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an endoscope hood according to the first embodiment. FIG. 2 is a perspective view showing a state in which the endoscope hood of FIG. 1 is attached to the insertion tube of the endoscope, with a part of the endoscope hood cut. FIG. 3 is a perspective view showing the inside of the holding member of the endoscope hood by further cutting a part of the endoscope hood of FIG. 2.

  The endoscope hood 10 includes a holding member 12 and a base end portion 14. The endoscope hood 10 is detachably attached to the insertion tube 50 so that the distal end portion of the insertion tube 50 of the endoscope (not shown in FIG. 1) is fitted to the proximal end portion 14 (see FIG. 2). . The insertion tube 50 has flexibility and is inserted into the body cavity of the subject. The distal end surface 54 of the insertion tube 50 is provided with an objective lens 58 and openings of a light guide 62 and an air / water supply nozzle 63.

  The distal end surface 54 of the insertion tube 50 is further provided with an opening for a forceps channel 56 (see FIG. 3). The forceps channel 56 is a passage for the forceps 60 (treatment tool) on the insertion tube 50 side. In addition, a passage hole 12M for allowing the forceps 60 to slidably advance and retreat is provided at substantially the center of the holding member 12 of the endoscope hood 10. Therefore, the forceps 60 protruding from the distal end surface 54 through the insertion tube 50 can be advanced and retracted in the passage hole 12M while being held by the holding member 12 around the passage hole 12M.

  The holding member 12 is a truncated cone-shaped convex body having a tapered front end surface 22 side opposite to the base end portion 14. The inner diameter at the distal end of the holding member 12, that is, the diameter of the passage hole 12 </ b> M in the distal end surface 22 is slightly smaller than the diameter 60 </ b> D of the forceps 60. For this reason, the forceps 60 passing through the passage hole 12M can be slidably advanced and retracted while being held by the holding member 12.

  FIG. 4 is a cross-sectional view of the holding member 12 of the present embodiment cut along a plane including a virtual line (for example, the center line of the holding member 12) along the depth direction of the passage hole 12M. Shows the state of deformation due to advance and retreat FIG. 5 is a front view showing the distal end surface 22 of the holding member 12.

  The holding member 12 includes a curved plate-like stretchable region 16 and a non-stretchable region 18 that constitute the wall surface of the truncated cone. The non-stretchable region 18 is thicker than the stretchable region 16 and is less stretchable than the stretchable region 16. For this reason, the expansion / contraction region 16 expands and contracts more than the non-expandable region 18 due to the advancement / retraction of the forceps 60 in the passage hole 12M.

  When the forceps 60 is inserted into the passage hole 12M, the distal end portion of the forceps 60 comes into contact with the holding member 12 inside the distal end surface 22, as indicated by a solid line in FIG. From this state, when the forceps 60 is further inserted into the passage hole 12M as indicated by a two-dot chain line, the stretchable region 16 extends along the forceps 60 due to a frictional force generated between the forceps 60. On the other hand, the non-stretchable region 18 does not expand / contract when the forceps 60 is inserted.

  As is clear from the above, when the forceps 60 is inserted into the passage hole 12M, the forceps 60 is indicated by an arrow A when contacting the holding member 12 inside the distal end surface 22 (see solid line). Turn to the direction. And the forceps 60 turns so that it may face the direction which the arrow B shows by further insertion (refer a dashed-two dotted line). Thus, when the forceps 60 is inserted into the passage hole 12M, the direction of the forceps 60 is changed so as to be away from the central axis 12A of the holding member 12.

  The central axis 12A of the holding member 12 is parallel to the central axis of the insertion tube 50 that is not curved when the endoscope hood 10 is attached. In FIG. 4, the turning of the forceps 60 is exaggerated for convenience of explanation.

  On the other hand, when the distal end of the forceps 60 inserted into the passage hole 12M is inserted to a position sufficiently away from the distal end surface 22 of the holding member 12, the forceps 60 is no longer caused by the frictional force generated between the forceps 60 and the holding member 12. , No longer inserted. When the forceps 60 is retracted from the passage hole 12M so as to return to the position before insertion from this state, the stretchable region 16 extends from the stretched state (see the two-dot chain line) to the state before the stretch (see the solid line). Shrink and return to its original shape. As a result, the forceps 60 that has faced the direction indicated by the arrow B is turned again so as to return to the direction before insertion indicated by the arrow A.

  FIG. 5 is a front view showing the distal end surface 22 of the holding member 12. When viewed from the distal end surface 22 side, the forceps 60 changes its direction as indicated by an arrow C in FIG. 5 when inserted into the passage hole 12M, and the original force as indicated by an arrow D when retracted from the passage hole 12M. Return to the direction. The direction of turning of the forceps 60 indicated by the arrows C and D coincides with the direction connecting the thinnest portion 16T in the stretchable region 16 and the thickest portion 18T in the non-stretchable region 18.

  In this way, by changing the direction of the forceps 60 that advance and retreat in the passage hole 12M only to a predetermined direction, for example, treatment with the forceps 60 such as excision of the affected part becomes easy. This is because the user who confirms the position of the affected part by endoscopic observation can perform the treatment while predicting the moving direction of the forceps 60. At this time, if the forceps 60 can be turned in various directions, it becomes difficult for the user operating the forceps 60 to grasp the direction of the forceps 60, that is, the moving direction, and it takes time for the treatment. There is also a fear.

  The endoscope hood 10 includes a plate-like member 24 that separates the holding member 12 and the base end portion 14, and the holding member 12 protrudes from the plate-like member 24 (see FIGS. 1 to 3). . The plate-like member 24 is provided with a suction port 24M. The suction port 24M communicates with the passage hole 12M. Therefore, fluid that can interfere with endoscopic observation, such as excess wash water discharged from the air / water supply nozzle 63 and the blood of the subject, is in the state where the forceps 60 is not inserted, and the plate-like member 24. Is sucked into the forceps channel 56 through the passage hole 12M and the suction port 24M (see FIG. 3).

  Thus, in order to make the suction port 24M communicate with the passage hole 12M, the suction port 24M is provided in the vicinity of the joint portion between the holding member 12 and the plate member 24 that are integrally formed with each other. In addition, since the forceps channel 56 is provided substantially at the center of the distal end surface 54 of the insertion tube 50, the suction port 24 </ b> M is located on the endoscope hood 10 more than the joint between the holding member 12 and the plate-like member 24. It is arranged on the center side (see FIGS. 1 and 2). As described above, the suction port 24M is disposed on the center side so as to correspond to the position of the opening of the forceps channel 56, whereby the suction port 24M is disposed on the outer side of the joint portion between the holding member 12 and the plate-like member 24. Compared to the case, the fluid can be sucked more efficiently. This is because the opening of the forceps channel 56 and the suction port 24M face each other.

  As described above, according to the endoscope hood 10 of the present embodiment, the direction of the forceps 60 that advances and retreats in the passage hole 12M is changed only in a predetermined direction, that is, only in the direction away from the central axis 12A and in the opposite direction. By making it possible (see FIG. 4), the operability of the treatment instrument such as the forceps 60 can be improved.

  Next, a second embodiment will be described. FIG. 6 is a perspective view showing the inside of the holding member 12 by cutting a part of the endoscope hood 10 of the second embodiment. FIG. 7 is a cross-sectional view of the holding member 12 of the present embodiment corresponding to FIG.

  In the present embodiment, the shape of the holding member 12 is different from that of the first embodiment. That is, in the holding member 12 of the present embodiment, the stretchable region 16 and the non-stretchable region 18 have the same thickness, and the stretchable region 16 is provided with a groove 16S. By providing the groove 16S, the stretchable region 16 can be stretched in accordance with the advancement and retraction of the forceps 60, as in the first embodiment.

  On the other hand, the groove 16S is not provided, and the non-stretchable region 18 having an appropriate thickness is hardly deformed by the advancement / retraction of the forceps 60. As is clear from the above, also in this embodiment, the forceps 60 that advance and retreat in the passage hole 12M turn as in the first embodiment (see FIG. 7). In addition, the expansion / contraction direction of the expansion / contraction area | region 16 is also defined by the groove | channel 16S. That is, the stretchable region 16 is stretched along a direction perpendicular to the longitudinal direction of the elongated groove 16S (see FIG. 6) and substantially parallel to the direction in which the passage hole 12M extends and the central axis 12A (see FIG. 7). .

  As described above, according to the present embodiment, although it is necessary to provide the groove 16S, it is not necessary to adjust the thickness of the holding member 12, so that the operability of the treatment instrument can be improved. The food hood 10 can be manufactured by a simpler manufacturing method. Furthermore, by providing the groove 16S, the expansion / contraction amount of the expansion / contraction region 16 can be made larger than that in the first embodiment without the groove 16S.

  Next, a third embodiment will be described. FIG. 8 is a perspective view showing the inside of the holding member 12 by cutting a part of the endoscope hood 10 of the third embodiment. FIG. 9 is a cross-sectional view of the holding member 12 of the present embodiment corresponding to FIGS. 4 and 7.

  In the present embodiment, the shape of the holding member 12 is different from those in the first and second embodiments. That is, in the holding member 12 of the present embodiment, the bellows portion 16B is provided in the stretchable region 16. As in the second embodiment, the stretchable region 16 and the non-stretchable region 18 have the same thickness.

  In this way, by folding a part of the stretchable region 16 in a bellows shape, the stretchable region 16 can be stretched more reliably than in the above-described embodiment. This is because by providing the bellows portion 16B, the length in the direction of the central axis 12A when the stretchable region 16 is extended can be made sufficiently larger than the corresponding length of the non-stretchable region 18. In addition, the expansion / contraction direction of the expansion-contraction area | region 16 is also defined by the bellows part 16B. That is, the peaks and valleys of the bellows portion 16B are arranged so as to be perpendicular to the central axis 12A, and as a result, the expansion / contraction region 16 expands and contracts along a direction substantially parallel to the central axis 12A (see FIG. 9).

  As described above, according to the present embodiment, by providing the bellows portion 16B, the degree of turning of the forceps 60, that is, the turning angle (see FIG. 9) formed by the direction indicated by the arrow A and the direction indicated by the arrow B is increased. can do.

  The shape or the like of the endoscope hood 10 is not limited to any embodiment. For example, as shown in FIG. 10, the first embodiment and the second embodiment may be combined to provide a groove 16 </ b> S in the stretchable region 16 and make the non-stretchable region 18 thicker than the stretchable region 16. . In this case, the forceps 60 can be turned more reliably and largely than in these embodiments. The same applies to the third embodiment, and may be combined with the first or second embodiment or both.

  Further, instead of reducing the diameter 12D (see FIG. 3) of the distal end of the holding member 12, a plurality of protrusions may be provided inside the distal end surface 22 to hold a treatment instrument such as the forceps 60. Further, if the stretchable region 16 and the non-stretchable region 18 are formed of materials having different shrinkage properties, a conical holding member 12 having a stretchable region 16 and a non-stretchable region 18 that are plate-shaped with a uniform thickness. In addition, the holding member 12 that is not provided with a groove or a bellows region may be employed.

  Furthermore, in any of the embodiments, as long as the stretchability of the non-stretchable portion 18 is lower than the stretchable portion 16 (that is, the stretchable portion 16 is relatively easily stretchable), the stretchable portion 16 The stretchability of the non-stretchable portion 18 can be changed as appropriate. For example, the non-stretchable region 18 may not substantially expand and contract. Thus, the magnitude | size and quantity which forceps 60 turn can be adjusted by changing the elasticity of both members suitably.

It is a perspective view which shows the hood for endoscopes of 1st Embodiment. It is a perspective view which cut | disconnects a part of endoscope hood and shows the state in which the endoscope hood of FIG. 1 was attached to the insertion tube of an endoscope. FIG. 3 is a perspective view showing the inside of the holding member of the endoscope hood by further cutting a part of the endoscope hood of FIG. 2. It is sectional drawing of the holding member of 1st Embodiment cut | disconnected by the plane containing the virtual line along the depth direction of a passage hole. It is a front view which shows the front end surface of a holding member. It is a perspective view which cut | disconnects some endoscope hoods of 2nd Embodiment, and shows the inside of a holding member. It is sectional drawing of the holding member of 2nd Embodiment corresponding to FIG. It is a perspective view which cut | disconnects some endoscope hoods of 3rd Embodiment, and shows the inside of a holding member. It is sectional drawing of the holding member of 3rd Embodiment corresponding to FIG. 4 and FIG. It is a perspective view which cut | disconnects a part of endoscope hood which combined 1st and 2nd embodiment, and shows the inside of a holding member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Endoscope hood 12 Holding member 12A Central axis 12M Passing hole 16 Stretching region 16B Bellows part 16S Groove 18 Non-stretching region 24 Plate-like member 24M Suction port 50 Insertion tube 54 Tip surface 60 Forceps (treatment tool)

Claims (11)

An endoscope hood that is detachably attached to the distal end of an endoscope insertion tube,
A passage hole for slidably moving the treatment tool passing through the insertion tube is provided, and is an area for holding the treatment tool around the passage hole, and expands and contracts by the advancement and retraction of the treatment tool. A region and a non-stretchable region that is less stretchable than the stretchable region,
When the treatment tool is inserted into the passage hole, the stretchable area moves toward the non-stretchable area due to the extension of the stretchable area, and when retracted from the passage hole, the stretchable area shrinks to the original shape before insertion. An endoscope hood characterized in that it is turned so as to return to its direction.   The endoscope hood according to claim 1, wherein the stretchable region and the non-stretchable region are plate-shaped, and the non-stretchable region is thicker than the stretchable region.   The endoscope hood according to claim 1 or 2, wherein a groove for expansion and contraction due to advancement and retraction of the treatment instrument is provided in the expansion and contraction region.   The endoscope hood according to claim 3, wherein the stretchable region stretches and contracts in a direction perpendicular to the longitudinal direction of the groove and parallel to the direction in which the passage hole extends.   The endoscope according to any one of claims 1 to 4, wherein the stretchable region has a bellows part, and a peak of the bellows part is perpendicular to a central axis of the holding member. hood.   A holding member having a truncated cone shape having a tapered tip end portion, which has the stretchable region and the non-stretchable region, and is located on a side opposite to a base end portion of the endoscope hood. The endoscope hood according to any one of claims 1 to 5.   The endoscope hood according to claim 6, wherein an inner diameter of the holding member at the distal end portion is smaller than a diameter of the treatment instrument.   The endoscope hood according to claim 6 or 7, wherein the treatment instrument turns in a direction away from a central axis of the holding member when inserted into the passage hole.   A plate-like member that separates a base end portion of the endoscope hood attached to the insertion tube and the holding member; and in the plate-like member, fluid is supplied to the insertion tube from the outside of the plate-like member. The endoscope hood according to any one of claims 6 to 8, wherein a suction hole for suction is provided.   The endoscope hood according to claim 9, wherein the suction hole communicates with the passage hole.   The holding member protrudes from the plate-like member, and the suction hole is provided closer to the center side of the endoscope hood than a joint portion between the holding member and the plate-like member. The hood for an endoscope according to claim 9 or 10, wherein the hood is for endoscopes.

Images