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Obesity Surgery

High-frequency-incision-device

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High-frequency incision device

Details

Inventors: Tsukagoshi, Tsuyoshi;
Assignee: Olympus Optical Co., Ltd. (Tokyo, JP)
Primary Examiner: Kamm; William E.
Assistant Examiner: Hindenburg; Max F.
Attorney, Agent or Firm:

A high-frequency incision device has a flexible sheath adapted to be inserted into the patient's body through the insertion channel of an endoscope. An end member is fixed to the distal end of the sheath and has a through hole extending in the axial direction of the sheath. The hole has a small diameter section on the side of the distal end of the sheath, a large diameter section, and a shoulder defined between the sections. A knife for piercing a desired portion is inserted through the hole to be capable of being project from and retreated into the sheath. The knife has a stopper portion integrally formed therewith and having a width greater than the small diameter section and smaller than the large diameter section. The stopper portion restricts the extent of projection of the knife cooperating with the shoulder. The knife is connected to a high-frequency power source through an operating wire.

DETAILED DESCRIPTION The invention has been intended in the light of the above affairs, and its object is to provide a high-frequency incision device, which can reliably restrict the extent of projection of the knife and also prevent falling of the knife into the patient's body.
To attain the above object of the invention, there is provided a high frequency incision device, in which restricting means for restricting the extent of projection of the knife is integrally formed with the knife and has a greater width than the minimum diameter of the through hole formed in the end member.
With the incision device according to the invention, restricting means for restricting the extent of projection of the knife includes an engagement portion integral with the knife and having an increased width with respect to the rest of the knife and a stopper tube fitted on a portion of the knife inclusive of the engagement portion.
The stopper tube has an outer diameter greater than the minimum diameter of the through hole of the end member, and its bore has a large diameter section corresponding to the engagement portion and a small diameter section nearer the distal end of the knife than the large diameter section.

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