Endoscopic treatment instrument

• US 8,167,893 B2
• Filed: 09/20/2007
• Issued: 05/01/2012
• Est. Priority Date: 09/22/2006
• Status: Active Grant

• Current Assignee: Olympus Corporation
• Original Assignee: Olympus Medical Systems Corporation (Olympus Corporation)
• Inventors: Motosugi, Shunsuke
• Primary Examiner(s): Severson, Ryan
• Assistant Examiner(s): Cronin, Ashley
• Application Number:
  US11/903,116
• Publication Number:
  US 20080215064A1
• Time in Patent Office: 1,685 Days
• Field of Search: 600/47, 600/104, 600/106, 600/114, 600/117, 600/127, 600/153, 606/110, 606/113, 606/114, 606/127
• US Class Current: 606/113
• CPC Class Codes: A61B 1/0008 characterised by distal tip features
• CPC Class Codes: A61B 1/00089 Hoods
• CPC Class Codes: A61B 1/018 for receiving instruments
• CPC Class Codes: A61B 17/32056 Surgical snare instruments for removing or smashing calculi A61B2017/2212; tonsillotomes A61B17/26
• CPC Class Codes: A61B 17/3478 Endoscopic needles, e.g. for infusion biopsy needles A61B10/0233; catheters with injection needles A61M25/0067
• CPC Class Codes: A61B 18/14 Probes or electrodes therefor
• CPC Class Codes: A61B 18/1492 having a flexible, catheter-like structure, e.g. for heart ablation A61B18/1477 takes precedence
• CPC Class Codes: A61B 2017/00296 mounted on an endoscope
• CPC Class Codes: A61B 2018/00482 Digestive system
• CPC Class Codes: A61B 2018/00982 combined with or comprising means for visual or photographic inspections inside the body, e.g. endoscopes
• CPC Class Codes: A61B 2018/1407 Loop
• CPC Class Codes: A61B 2018/141 Snare
• CPC Class Codes: A61B 2018/1495 Electrodes being detachable from a support structure

Abstract

An endoscopic treatment instrument is provided comprising: a cylinder adapted to be fitted over a tip of an insertion section of an endoscope; a loop-shaped snare wire which protrudes in the cylinder from a snare sheath that is extendable and retractable with respect to the insertion section and which is extendable within the cylinder; a hooked portion which is formed and radially inwardly extended from the circumference of the tip of cylinder and which holds the snare wire within the cylinder; a locking portion which is provided on the hooked portion and retains a folded-back portion of the snare wire that is forwardly moved toward the cylinder tip with respect to the snare sheath and by means of which the snare wire is turned upside-down around the folded-back portion.

Claims

1. An endoscopic treatment instrument comprising:

a cylinder adapted to be fitted over a tip of an insertion section of an endoscope;

a loop-shaped snare wire which protrudes in the cylinder from a snare sheath that is extendable and retractable with respect to the insertion section and which is extendable within the cylinder;

a hooked portion which is radially inwardly extended from the circumference of a tip of the cylinder and which holds the snare wire within the cylinder;

a locking portion provided on the hooked portion in front of a distal end of the snare wire and the snare sheath so as to face the distal end of the snare wire and the snare sheath; and

an auxiliary hooked portion bent at an end part of the hooked portion and extending toward the proximal end of a cap portion, wherein

when the snare wire advances to the locking portion, the locking portion contacts a folded-back portion of the snare wire and the locking portion and the auxiliary hooked portion holds the folded-back portion.

2. The endoscopic treatment instrument as recited in claim 1, wherein the auxiliary hooked portion protrudes from an end portion of the hooked portion in the vicinity of a point where the extension of the snare wire intersects toward a base end side of the cylinder.

3. The endoscopic treatment instrument as recited in claim 1, wherein the locking portion includes a depressed portion or through-hole which is provided on the hooked portion in the vicinity of which the extension of the snare wire intersects.

4. The endoscopic treatment instrument as recited in claim 1, wherein the locking portion includes a friction generating portion which is provided on an outer surface of the hooked portion and which has a larger coefficient of friction than the outer surface of the hooked portion.

5. The endoscopic treatment instrument as recited in any one of claims 1, 2 and 3, further comprising a tube which opens at its tip in the cylinder and in which the snare sheath is received so as to be extendable and retractable.