JP4349870B2 - Endoscope tip hood - Google Patents

Description

  The present invention relates to a tip hood attached to the tip of an insertion portion of an endoscope.

The endoscope front hood is generally detachable so that it protrudes forward in a substantially cylindrical shape from the distal end surface of the distal end main body of the endoscope insertion portion in which the observation window and the treatment instrument projection opening are arranged side by side. It is comprised so that it can attach (for example, patent document 1, patent document 2).
Utility Model Registration No. 2558512 Japanese Patent Laid-Open No. 8-131397

  As one example of transendoscopic mucosal resection, the affected mucosa is sucked into a polyp shape by sucking the affected mucosa into a tip hood that protrudes in a substantially cylindrical shape from the tip surface of the tip body of the endoscope insertion portion to the tip loop. A treatment is performed to cut the base of the affected mucous membrane with a high-frequency snare or the like where the electrode portion is bent sideways. During such a treatment, the tip loop electrode of the high-frequency snare is spread in the tip hood. It is hooked on the mucous membrane like a ring.

  However, the treatment instrument protrusion port is not arranged near the outer edge of the distal end surface of the distal end portion body, but is located at a position near the center to some extent due to restrictions on the layout of the treatment instrument insertion channel communicating with the interior thereof.

  Therefore, for example, as shown in FIG. 4, the tip loop electrode 51 of the bent high-frequency snare 50 cannot be greatly expanded in the tip hood 10, and the excision range becomes small. In many cases, the flexible sheath 52 of the high-frequency snare 50 largely fluctuates in the treatment instrument protruding port 3 and impairs the sniping ability with respect to the affected mucous membrane 100.

  Accordingly, the present invention provides an endoscope that can widen the tip loop electrode portion of the high-frequency snare within the tip hood to ensure a sufficient excision range, and can improve the snipability of the high-frequency snare with respect to the target site. The object is to provide a tip hood.

  To achieve the above object, the distal end hood of the endoscope of the present invention is generally forward from the distal end surface of the distal end main body of the endoscope insertion portion in which the observation window and the treatment instrument protruding port are arranged side by side. In a distal end hood of an endoscope that is detachably attached to the distal end main body so as to project in a cylindrical shape, the treatment instrument that is fitted from the front into the treatment instrument projection port and protrudes from the treatment instrument projection port is moved away from the observation window. A treatment instrument guide portion for guiding the guide so as to deviate in the direction is integrally formed.

  The treatment instrument guide portion has a connecting portion that connects a portion fitted in the treatment instrument projection opening and the substantially cylindrical projection portion at a position along the distal end surface of the distal end portion body, and the treatment instrument projection When the treatment instrument guide hole having a diameter smaller than the diameter of the mouth is formed across the portion where the treatment instrument guide hole is fitted into the treatment instrument projection opening and the connecting portion, the sniper performance is improved.

  Further, when the connecting portion is outside the observation visual field range from the observation window, the endoscope observation is not hindered, and it is convenient for peripheral observation if the substantially cylindrical protrusion is formed of the transparent member.

  According to the present invention, a treatment instrument such as a high-frequency snare projecting from the treatment instrument projecting port is protruded by being deflected in a direction away from the observation window by the treatment instrument guide unit formed integrally with the tip hood. By expanding the tip loop electrode part of the high-frequency snare greatly in the tip hood, a sufficient excision range can be secured, and by forming a treatment instrument guide hole with a diameter smaller than the diameter of the treatment instrument protrusion at the treatment instrument guide part The sniper property of the high-frequency snare with respect to the target part can be improved.

  An endoscope that is detachably attached to the distal end body so as to protrude forward in a substantially cylindrical shape from the distal end surface of the distal end body of the endoscope insertion portion in which the observation window and the treatment instrument projection opening are arranged side by side. A treatment instrument guide portion is integrally formed on the front end hood of the mirror so as to guide the treatment instrument, which is fitted from the front into the treatment instrument projection opening and is protruded from the treatment instrument projection opening, in a direction away from the observation window. The treatment instrument guide portion is formed with a treatment instrument guide hole having a diameter smaller than the diameter of the treatment instrument protrusion.

Embodiments of the present invention will be described with reference to the drawings.
2 is a front view of the distal end portion of the insertion portion of the endoscope, and FIG. 1 is a side cross-sectional view of the distal end portion of the insertion portion of the endoscope including the center of the observation window 2 and the center of the treatment instrument protrusion 3. FIG.

  An observation window 2 for observing the front of the distal end main body 1 and a treatment instrument projecting opening for projecting treatment instruments are provided on the distal end surface 1a of the substantially cylindrical distal end main body 1 which is the most advanced member of the insertion portion. 3 are arranged side by side, and an illumination window 4 and the like are also arranged.

  An objective optical system 5 is disposed in the back of the observation window 2, and a solid-state image sensor 6 is disposed at a subject projection position by the objective optical system 5. In addition, a distal end opening of the treatment instrument insertion channel 7 that is inserted and disposed throughout the entire length in the insertion portion is communicated with the back of the treatment instrument protrusion 3.

  For example, the proximal end side of the distal end hood 10 formed into a substantially cylindrical shape having a diameter substantially the same as the outer diameter of the distal end main body 1 by a transparent resin such as a transparent acrylic resin or polycarbonate resin is elastic. A resilient ring 11 formed in a cylindrical shape whose inner diameter is smaller than the outer diameter of the distal end main body 1 by a rubber material or the like is integrally connected by welding or the like.

  The elastic ring 11 is detachable from the distal end main body 1 by being elastically deformed, and the distal end hood 10 is attached to the distal end main body 1 by tightening the outer peripheral surface of the distal end main body 1 with the elastic ring 11. If the elastic ring 11 is removed from the tip body 1, the tip hood 10 is also removed. However, various structures, such as an engagement protrusion and a groove | channel, are employable for attachment / detachment of the front-end | tip hood 10 with respect to the front-end | tip part main body 1. FIG.

  A treatment instrument guide hole 13 that is fitted into the distal hood 10 from the front into the treatment instrument protrusion 3 and guides the treatment instrument that protrudes from the treatment instrument protrusion 3 to deviate in a direction away from the observation window 2. The treatment instrument guide portion 12 in which is formed is integrally formed.

  The treatment instrument guide portion 12 is connected at a position along the distal end surface 1a of the distal end portion main body 1 between a portion 12a fitted into the treatment instrument projection port 3 and the distal end hood 10 (that is, a substantially cylindrical projection portion). The connecting portion 12b is formed, and the connecting portion 12b is located outside the observation visual field range VF from the observation window 2.

  The treatment instrument guide hole 13 extends across the portion 12a and the connecting portion 12b that are fitted in the treatment instrument projection port 3 of the treatment instrument guide portion 12, and moves in a direction away from the observation optical axis of the observation window 2 as it goes forward. The corner is formed.

  Such a treatment instrument guide hole 13 is formed with a diameter smaller than the diameter of the treatment instrument protrusion 3 and is smoothly connected to the treatment instrument protrusion 3 at the ridge line position A farthest from the observation window 2 of the treatment instrument protrusion 3. In addition, the ridge line portion of the treatment instrument guide hole 13 positioned in the treatment instrument protrusion 3 is smoothly tapered and chamfered so that a step cannot be formed with respect to the inner peripheral surface of the treatment instrument protrusion 3.

  FIG. 3 shows a state in which transendoscopic mucosal resection is performed using an endoscope to which the distal end hood 10 of this embodiment is attached, and the affected mucosa located inside the distal end hood 10. 100 is observed through the observation window 2, and the state around the tip hood 10 is also observed through the transparent tip hood 10.

  Then, the high-frequency snare 50 that has passed through the treatment instrument insertion channel 7 is deviated in a direction away from the observation window 2 by passing through the treatment instrument guide hole 13 of the distal hood 10, and at the most distal portion of the distal hood 10. The outer edge of the tip hood 10 is approached.

  As a result, the tip loop electrode 51 protruding in a state bent sideward from the tip of the high frequency snare 50 is greatly spread over the inner space of the tip hood 10 and hooked on the affected mucous membrane 100, and a high frequency current is applied to the tip loop electrode 51. Thus, the affected mucous membrane 100 can be excised in a wide range.

  In addition, since the diameter of the treatment instrument guide hole 13 is smaller than the diameter of the treatment instrument protrusion 3, the backlash of the flexible sheath 52 passing therethrough is small. It can be guided to aim and can be easily excised with the tip loop electrode 51.

It is side surface sectional drawing of the front-end | tip part of the insertion part of the endoscope of the Example of this invention. It is a front view of the front-end | tip part of the insertion part of the endoscope of the Example of this invention. It is side surface sectional drawing of the front-end | tip part of the insertion part of the use condition of the endoscope of the Example of this invention. It is side surface sectional drawing of the front-end | tip part of the insertion part of the use condition of the conventional endoscope.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tip part main body 1a Tip surface 2 Observation window 3 Treatment tool protrusion 10 Tip hood 12 Treatment tool guide part 12a The part inserted in the treatment tool protrusion 12b Connection part 13 Treatment tool guide hole 50 High frequency snare (treatment tool)
51 Tip Loop Electrode 52 Flexible Sheath

Claims (4)

An inner part that is detachably attached to the distal end body so as to project forward in a substantially cylindrical shape from the distal end surface of the distal end body of the endoscope insertion portion in which the observation window and the treatment instrument projection opening are arranged side by side. In the tip hood of the endoscope,
A treatment instrument guide portion that is inserted from the front into the treatment instrument projection opening and guides the treatment instrument projected from the treatment instrument projection opening so as to deviate in a direction away from the observation window is integrally formed. Endoscope hood characterized by The treatment instrument guide has a connecting portion that connects a portion fitted into the treatment instrument protrusion and the substantially cylindrical protrusion at a position along the distal end surface of the distal end main body, and The endoscope distal end hood according to claim 1, wherein a treatment instrument guide hole having a diameter smaller than a diameter of the treatment instrument protrusion is formed across a portion into which the treatment instrument protrusion is fitted and the connecting portion. The endoscope front end hood according to claim 2, wherein the connecting portion is outside an observation visual field range from the observation window. The distal end hood of an endoscope according to claim 1, 2 or 3, wherein the substantially cylindrical protrusion is formed of a transparent member.

Images