Manipulating part of endoscopic treatment tool

Details Manipulating part of endoscopic treatment tool Manipulating part of endoscopic treatment tool

1999-05-27

2001-04-03

Dvorak, Linda C. M. (Department: 3739)

Surgery

Instruments

C606S205000, C600S184000

Reexamination Certificate

active

06210398

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a manipulating part of an endoscopic treatment tool that is to be inserted into a treatment tool insertion channel of an endoscope.
In general, an endoscopic treatment tool is designed such that a distal end operating section is driven with a manipulating part on an operator side through a manipulating wire passed through and axially movable with respect to a sheath inserted into a treatment tool insertion channel of an endoscope.
The manipulating part is generally equipped with a first finger retaining member that is attached to a cylindrical member connected to the proximal end of the sheath, and a second finger retaining member that is slidable relative to the cylindrical member and connected to the proximal end of the manipulating wire. The sliding motion of the second finger retaining member along the cylindrical member causes the axial motion of the manipulating wire.
In case of some treatment tools, such as an endoscopic forceps tool, which use a closely wound coil as the sheath, the manipulating stroke varies depending on the degree of bending of the sheath. Therefore, during the use of the tool, the manipulating stroke may be too short to perform sufficient operation, or excessively long, causing the buckling of the manipulating wire.
In case of a high frequency snare, a basket type grasping tool, etc. in which a plurality of elastically contractible and expandable wires are retracted into or protruded from the distal end of the sheath, the constant size of the expanded elastic wires is inconvenient for an operator to treat a polyp, a foreign matter or the like which has a different size.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a manipulating part of an endoscopic treatment tool, which makes it possible to readily adjust the stroke of a manipulating wire depending on the condition of use.
To achieve the above-noted object, the present invention provides a manipulating part of an endoscopic treatment tool, comprising: a shaft member having a first finger retaining member; a second finger retaining member slidably mounted to the shaft member so that a sliding movement of the second finger retaining member along the shaft member drives a distal end operating part remote from the manipulating part; and a stopper movably provided on the shaft member, and fixed at an arbitrary position on the shaft member, the stopper restricting a length of the sliding movement of the second finger retaining member.
The stopper may be fixed by a manually-operable screw relative to the shaft member, or the shaft member may be elastically deformed to permit the movement of the stopper relative to the shaft member, while a deformation restricting member may be connected to the second finger retaining member to inhibit the elastic deformation of the shaft member when the second finger retaining member is located close to the stopper.
In the latter case, it is preferable that the stopper is annular and surrounds the shaft member, at least one protrusion is provided on an inner circumferential surface of the stopper and a plurality of recesses each for engagement with the protrusion are provided on an outer surface of the shaft member and arranged along the length of the shaft member with intervals.
The stopper and the shaft member may be fixed to each other through a ratchet.
The shaft member is preferably in the form of a cylindrical member.
The present disclosure relates to the subject matter contained in Japanese patent application No. Hei. 10-146808 (filed on May 28, 1998), which is expressly incorporated herein by reference in its entirety.


REFERENCES:
patent: 5376094 (1994-12-01), Kline
patent: 5666965 (1997-09-01), Bales et al.
patent: 5683413 (1997-11-01), Miyagi
patent: 5766184 (1998-06-01), Matsuno et al.
patent: 5843091 (1998-12-01), Holsinger et al.

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