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EP-3689221-B1 - ENDOSCOPE

EP3689221B1EP 3689221 B1EP3689221 B1EP 3689221B1EP-3689221-B1

Inventors

  • HARADA, TAKASHI

Dates

Publication Date
20260506
Application Date
20180925

Claims (13)

  1. An endoscope (10) comprising: an operating part (22) that is provided with an operating member; an insertion part (24) that is provided on a distal end side of the operating part (22) and is inserted into a subject; an elevator (30) that is provided at a distal end part of the insertion part (24); an erection operating wire (60) that is disposed to be inserted through a wire insertion passage (174, 204, 244) formed from the operating part (22) to the insertion part (24) so as to be movable forward and backward and is attachably and detachably coupled to the elevator (30) on a distal end side thereof; a base member (98) that is provided in the operating part (22) and forms a slider housing space (150) that is independent of an internal space of the operating part; a first opening part (94,152A,172A,176,178,202A,206,208,232,242A,246,248) that is provided at a proximal end of the wire insertion passage (174, 204, 244) and delivers a proximal end side of the erection operating wire (60) to the slider housing space (150); a slider (96,170,200,240) that is disposed in the slider housing space (150) and is movable forward and backward in a longitudinal direction of the operating part (22) depending on an operation of the operating member; an engaged part (152,172,202,242) that is provided in the slider (96,170,200,240) and is recessed or protrudes toward a lateral side orthogonal to a movement direction of the slider (96,170,200,240); and an engaging member (100,154,180,210,250) that is provided at a proximal end of the erection operating wire (60) and is pushed into and engageable with the engaged part (152,172,202,242) from the lateral side, wherein the slider housing space (150) is exposable to outside of the operating part (22).
  2. The endoscope according to claim 1, wherein the engaged part (152,172,202,242) has an engagement receiving part (156) that extends linearly in the movement direction of the slider (96,170,200,240), and a positioning receiving part (158) that is provided at the engagement receiving part (156) and positions the engaging member (100,154,180,210,250) in the engaged part (152,172,202,242), and wherein the engaging member (100,154,180,210,250) has an engaging body part (160) that engages with the engagement receiving part (156), and a positioning part (162) that engages with the positioning receiving part (156).
  3. The endoscope according to claim 2, wherein the engaging member (100,154,180,210,250) has a columnar part that constitutes the engaging body part (160), and a head part that is formed to have a larger diameter than the columnar part and constitutes the positioning part (160).
  4. The endoscope according to claim 2 or 3, wherein the slider (96,170,200,240) has a guide surface (30A,116,164,173) that guides the positioning part (160) to the positioning receiving part (156).
  5. An endoscope according to any one of the preceding claims, wherein the base member (98) comprises a recessed strip (99) along a longitudinal axis (A) of a body part (98A) of the base member and the recessed strip (99) is formed in an upper surface of the body part (98A); and wherein the slider (96,170,200,240) comprises a protruding strip (97) formed on a lower surface of the slider (96,170,200,240) along a longitudinal axis (A) of the body part (98A) and the protruding strip (97) is arranged to slidably engage with the recessed strip.
  6. An endoscope according to claim 1, wherein the engaging member (100,154,180,210,250) has a slit-shaped sandwiching part (182,222) in which the proximal end side of the erection operating wire (60) is inserted and sandwiched from an outer surface side of the engaging member (100,154,180,210,250).
  7. The endoscope according to claim 6, wherein the engaging member (100,154,180,210,250) is a spherical body that engages with the engaged part (152,172,202,242), and wherein the sandwiching part (182,222) includes a semicircular slit (224,226,228) formed inward from an outer surface of the spherical body, and preferably, a bottom surface (182A) of the slit (224,226,228) reaches a center of the spherical body.
  8. An endoscope according to claim 1, further comprising: a locking mechanism that is switchable between a locked position where release of an engaged state between the engaging member (100,154,180,210,250) and the engaged part (152,172,202,242) is prevented and an unlocked position where the release of the engaged state between the engaging member (100,154,180,210,250) and the engaged part (152,172,202,242) is allowed.
  9. The endoscope according to claim 8, wherein the locking mechanism comprises a locking member (218) that is provided on any one of the engaging member (100,154,180,210,250) and the slider (96,170,200,240), and a locking recess that is provided on the other of the engaging member (100,154,180,210,250) and the slider (96,170,200,240) and engages with the locking member (218), and wherein the locked position is reached in a case where the locking member (218) and the locking recess are engaged with each other, and the unlocked position is reached in a case where the engagement between the locking member (218) and the locking recess is released.
  10. An endoscope according to claim 1, wherein the engaging member (100,154,180,210,250) that is pushed into and engageable with the engaged part (152,172,202,242) from the lateral side and sandwiches and fixes the proximal end side of the erection operating wire (60) between the engaging member (100,154,180,210,250) and the engaged part (152,172,202,242).
  11. The endoscope according to claims 8 and 9, wherein the locking mechanism comprises a cam engaging part that is provided on any one of the engaging member (100,154,180,210,250) and the engaged part (152,172,202,242), and a cam groove (136,142,254) that is provided on the other of the engaging member (100,154,180,210,250) and the engaged part (152,172,202,242) and engages with the cam engaging part, and the engaging member (100,154,180,210,250) and the engaged part (152,172,202,242) are engaged with each other and reaches the locked position as the cam engaging part is pushed into the cam groove (136,142,254) while being guided by the cam groove (136,142,254).
  12. The endoscope according to any one of preceding claims, wherein the operating part (22) has a second opening part (23) formed thereon, the base member (98) is provided in the second opening part (23), wherein the slider housing space (150) is exposable to outside of the operating part (22) via the second opening part (23).
  13. An endoscope according to claim 1, wherein the engaging member (100,154,180,210,250) engages with the engaged part (152,172,202,242) with elasticity.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope, and particularly, to an endoscope including a forceps elevator that changes a delivery direction of a treatment tool to a distal end part of an insertion part. 2. Description of the Related Art In endoscopes, various treatment tools are introduced from a treatment tool introduction port provided in a proximal operating part (hereinafter referred to as an "operating part"), and the treatment tools are delivered from a treatment tool delivery port opening to a distal end member of an insertion part to the outside, and are used for treatment. For example, treatment tools, such as forceps or a contrast tube, are used in duodenoscopes, and treatment tools, such as a puncturing needle, are used in ultrasonic endoscopes. In such treatment tools, it is necessary to change a delivery direction of a treatment tool delivered from a treatment tool delivery port in order to treat a desired position within a subject. For this reason, the distal end member is provided with a forceps elevator (hereinafter also referred to as an "elevator"). Additionally, the operating part is provided with a treatment tool erection mechanism that changes the posture of the elevator between an erected position and a lodged position. As the treatment tool erection mechanism, a wire pulling type mechanism to which a distal end part of a wire (also referred to as a forceps raising wire) is directly attached to the elevator is known (refer to JP1994-315458A (JP-H06-315458A)). This mechanism is a mechanism in which a proximal end side of the wire is coupled to an erection operating lever (also referred to as forceps raising lever) provided in the operating part, and the posture of the elevator is changed between the erected position and the lodged position by performing a push/pull operation of the wire by the erection operating lever, thereby rotating the elevator around a rotational movement shaft. Specifically, the operating part of JP1994-315458A (JP-H06-315458A) is provided with a grip part for holding the operating part by hand and an angle knob. In this operating part, a wire opening part is provided below the grip part, a drive shaft opening part is provided in the grip part, a proximal end of the wire is delivered from a wire opening part, and a distal end of the drive shaft moved by the forceps raising lever is delivered from the drive shaft opening part. The distal end of the drive shaft and the proximal end of the wire are detachably coupled to a connection tool having a set screw. Meanwhile, in a case where the endoscopes shown in JP1994-315458A (JP-H06-315458A) and EP1759626B are used for various kinds of examination or treatment, a body fluid adheres to the distal end member of the insertion part including the elevator and a guide tube through which the wire is inserted. Thus, after use, the endoscopes are subjected to cleaning and disinfection treatment, using a cleaning liquid and a disinfectant solution. In that case, the diameter of the guide tube is small and the wire is inserted through the guide tube. Therefore, in order to obtain a sufficient cleaning effect, substantial time and effort are taken for cleaning. Thus, in the endoscope of JP1994-315458A (JP-H06-315458A), the cover, which covers the distal end member of the insertion part, the elevator, and the wire are attachably and detachably provided, the cover, the elevator, and the wire are detached, and the distal end member of the insertion part and the guide tube of the wire are cleaned. Meanwhile, EP1759626B discloses an endoscope in which a proximal end of a cable cord is delivered from the proximal end of the control handle, and a collet is connected to a proximal end of the cable cord. The collet is fastened to a nut and is moved in a forward-backward direction by the operating lever. US5707344A discloses an endoscope having an instrument raising device for adjusting the direction of an instrument such as forceps inserted in a living body cavity by using the endoscope. SUMMARY OF THE INVENTION However, the endoscope of JP1994-315458A (JP-H06-315458A) has a configuration in which the connection tool (hereinafter referred to as a "slider"), which connects the proximal end side of the wire to the erection operating lever side, is housed in a narrow interior of the operating part, and the set screw is rotated to connect the proximal end side of the wire to the slider. Thus, there is a problem that the attachment and detachment work of the proximal end side of the wire with respect to the slider becomes complicated. Meanwhile, in the endoscope of EP1759626B, the cable cord is delivered to the outside of the control handle, and the distal end of the cable cord is attachably and detachably mounted to the collet and the nut. However, the attachment and detachment work is complicated. The invention has been made in view of such circumstances, and an object thereof is to pro