Advance and retreat assist tool for endoscopic treatment instrument

Patent metadata

Field	Value
Publication number	US-9486124-B2
Application number	US-201414477201-A
Country	US
Kind code	B2
Filing date	Sep 4, 2014
Priority date	Feb 27, 2013
Publication date	Nov 8, 2016
Grant date	Nov 8, 2016

Abstract

An advance and retreat assist tool includes a base unit, a first tubular member, a rotary portion and an advance and retreat mechanism. The advance and retreat assist tool further includes a hinge mechanism which switches to either a coaxial condition or a slanted condition.

First claim

What is claimed is:

1. An advance and retreat assist tool for an endoscopic treatment instrument, the advance and retreat assist tool comprising:
a base unit including a part where the endoscopic treatment instrument to be inserted into an endoscope passes, the base unit being fixed to the endoscope to face a treatment instrument insertion hole portion of the endoscope;
a first tubular member provided coaxially with a central axis of the treatment instrument insertion hole portion, the endoscopic treatment instrument being inserted into and fixed to the first tubular member;
a rotary portion into which the first tubular member is inserted, the rotary portion rotates around an axis of the first tubular member;
an advance and retreat mechanism configured to convert a rotation force during the rotation of the rotary portion to an advance and retreat force along an axial direction of the first tubular member to advance and retreat the first tubular member;
a support unit which supports the first tubular member so that the first tubular member is advanced and retreated by the advance and retreat mechanism; and
a hinge mechanism pivotally connecting the base unit and the support unit, the hinge mechanism pivots the support unit between a first position and a second position, wherein:
in the first position, an axis of the rotary portion is provided coaxially with the central axis of the treatment instrument insertion hole portion;
in the second position, the axis of the rotary portion is slanted relative to the central axis of the treatment instrument insertion hole portion; and
the endoscopic treatment instrument is inserted into or removed from the endoscope in the first position, and the rotary portion is operated to advance and retreat the endoscopic treatment instrument in the second position.

2. The advance and retreat assist tool for the endoscopic treatment instrument according to claim 1 , wherein the hinge mechanism is fixed in the second position so as to be slanted when the hinge mechanism switches to the second position.

3. The advance and retreat assist tool for the endoscopic treatment instrument according to claim 2 , wherein the hinge mechanism includes a member that rotates the support unit relative to the base unit by an external force that is applied equal to or greater than a desired value, the member fixes the hinge mechanism in to be slanted by an external force equal to or less than the desired value.

4. The advance and retreat assist tool for the endoscopic treatment instrument according to claim 2 , wherein the hinge mechanism includes:
a guide groove portion provided in the base unit, and a protrusion portion that slides on the guide groove portion; and
a lock portion provided in the guide groove portion, the lock portion locks the protrusion portion and fixes the support unit in the second position.

5. The advance and retreat assist tool for the endoscopic treatment instrument according to claim 1 , wherein
the central axis of the treatment instrument insertion hole portion is slanted at an angle θ1 relative to a central axis of a grasping portion of the endoscope in which the treatment instrument insertion hole portion is provided;
an angle formed between the axis of the first tubular member and the central axis of the grasping portion is an angle θ2; and
the angle θ1>the angle θ2 so that the rotary portion is adjacent to the grasping portion in the second position.

6. The advance and retreat assist tool for the endoscopic treatment instrument according to claim 1 , wherein the hinge mechanism rotates the support unit relative to the base unit so that:
the support unit including the first tubular member, the rotary portion, and the advance and retreat mechanism faces the base unit in the coaxial condition, and
the support unit including the first tubular member, the rotary portion, and the advance and retreat mechanism is slanted relative to the base unit toward a grasping portion of the endoscope in which the treatment instrument insertion hole portion is provided in the second position.

7. The advance and retreat assist tool for the endoscopic treatment instrument according to claim 1 , wherein
the base unit further comprises a first hole portion through which the endoscopic treatment instrument passes, the first hole portion having a first central axis; and
the advance and retreat assist tool for the endoscopic treatment instrument further comprising a fixing unit which fixes the base unit to the endoscope so that the first central axis of the first hole portion is provided coaxially with the central axis of the treatment instrument insertion hole portion, and the first hole portion faces the treatment instrument insertion hole portion.

8. The advance and retreat assist tool for the endoscopic treatment instrument according to claim 1 , wherein the advance and retreat mechanism intervenes between the rotary portion and the first tubular member.

9. The advance and retreat assist tool for the endoscopic treatment instrument according to claim 8 , wherein the advance and retreat mechanism includes:
a protrusion portion which is provided straight along a diametrical direction of the first tubular member, the protrusion portion is engaged with the circumferential surface of the first tubular member;
a second tubular member having a long opening portion through which the protrusion portion is inserted, the second tubular member being fixed to the support unit, the first tubular member being inserted into the second tubular member; and
a third tubular member having a spiral opening portion provided in the circumferential surface, the second tubular member being inserted into the third tubular member so that part of the spiral opening portion is in communication with part of the long opening portion and so that the protrusion portion, which is inserted through the long opening portion, is inserted into the spiral opening portion, the third tubular member being coaxial with the rotary portion, and the third tubular member rotating together with the rotary portion.

10. The advance and retreat assist tool for the endoscopic treatment instrument according to claim 9 , wherein
the third tubular member rotates in response to the rotation of the rotary portion causing the spiral opening portion to rotate;
the protrusion portion moves in the long opening portion along the axial direction of the first tubular member as a result of the rotation of the spiral opening portion;
the protrusion portion abuts on an edge portion of the long opening portion so that the first tubular member, with which the protrusion portion is engaged, is prevented from rotating around the axis of the rotary portion; and
the spiral opening portion rotates, and the protrusion portion moves in the long opening portion, so that the first tubular member advances and retreats in the axial direction of the rotary portion while the rotation of the first tubular member around the axis of the rotary portion is prevented.

11. The advance and retreat assist tool for the endoscopic treatment instrument according to claim 1 , further comprising a regulating mechanism which regulates the advance and retreat of the first tubular member to prevent the first tubular member from losing contact with the rotary portion when the first tubular member advances and retreats along the axial direction of the rotary portion.

12. The advance and retreat assist tool for the endoscopic treatment instrument according to claim 1 , wherein a proximal end portion of the first tubular member projects outside a proximal end portion of the rotary portion along the axial direction of the rotary portion.

Assignees

• Olympus Corp

Inventors

• Yamada Tetsuhiro

Classifications

• G02B23/2476

  Non-optical details, e.g. housings, mountings, supports · CPC title

• A61B1/018 Primary

  for receiving instruments · CPC title

• A61B17/00234

  for minimally invasive surgery (A61B17/0218, A61B17/0469, A61B17/12013, A61B17/1285, A61B17/29, A61B17/320016 take precedence) · CPC title

• A61B1/00133 Primary

  Drive units for endoscopic tools inserted through or with the endoscope · CPC title

• A61B2017/0034

  adapted to be inserted through a working channel of an endoscope · CPC title