Surgery – Instruments – Forceps
Reexamination Certificate
2001-03-27
2004-05-25
Worrell, Danny (Department: 3765)
Surgery
Instruments
Forceps
Reexamination Certificate
active
06740106
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to biopsy forceps and scissors forceps with blades, which an endoscope is equipped with for removing a piece of tissue from an inner part of a body, and a manufacturing method of the forceps.
2. Description of Related Art
A biopsy forceps is used to remove a piece of tissue from an inner part of a body by being inserted into the inner part of the body through a treatment tool insertion opening of an endoscope (e.g. Japanese Patent Application Laid-open Nos. 59-90553 and 61-128954).
A base material of pieces of the biopsy forceps is conventionally made of martensitic stainless steel or austenitic stainless steel. The forceps piece made of martensitic stainless steel is hardened by a heat process, and has a superior ability as a blade. However, in view of chemical resistance, the forceps piece made of martensitic stainless steel is corroded with acidic chemical, and thus its sharpness is deteriorated quickly and corroded dirt may fall into the body. On the other hand, the forceps piece made of austenitic stainless steel displays superior chemical resistant property (anti-disinfectant). However, the forceps piece made of austenitic stainless steel has insufficient sharpness due to its low hardness.
SUMMARY OF THE INVENTION
The present invention has been developed in view of the above-described circumstances, and has as its object the provision of a forceps for an endoscope and a method for manufacturing the forceps which has good chemical resistance as well as good sharpness.
In order to achieve the above-described object, the present invention is directed to a forceps for an endoscope, the forceps being inserted through a treatment tool insertion opening of the endoscope for treating a part of a body to which the endoscope is inserted, wherein: an electroless nickel plating film layer is formed over a surface of a base material of a piece of the forceps.
Moreover, in order to achieve the above-described object, the present invention is directed to a method for manufacturing a forceps for an endoscope, the forceps being inserted through a treatment tool insertion opening of the endoscope for treating a part of a body to which the endoscope is inserted, the method comprising the steps of: forming an electroless nickel plating film layer over a surface of a base material of a piece of the forceps by electroless plating; and putting an edge on the electroless nickel plating film layer.
According to the forceps for the endoscope of the present invention, the electroless nickel plating film layer is formed over the surface of the base material of the forceps piece; thus, the forceps has a good chemical resistance. Moreover, since the electroless nickel plating film layer has a hardness suitable for the forceps piece and also has superior toughness, an edging process can be easily performed on the electroless nickel plating film layer. Furthermore, by forming a thick electroless nickel plating film layer, re-edging process can be easily performed even in a case where a blade is broken by an external force or where an error in a processed size is corrected; thus the maintenance for the forceps improves. The base material for the forceps piece may be made of martensitic stainless steel or austenitic stainless steel, but if it is made of austenitic stainless steel, the chemical resistant properties still improve greatly.
REFERENCES:
patent: 4492231 (1985-01-01), Auth
patent: 5196009 (1993-03-01), Kirwan, Jr.
patent: 5695510 (1997-12-01), Hood
patent: 5746740 (1998-05-01), Nicholas
patent: 689 13 909 (1994-10-01), None
patent: 0 367 818 (1994-03-01), None
patent: 5990553 (1984-05-01), None
patent: 61128954 (1986-06-01), None
patent: 3-51537 (1991-03-01), None
Akiba Yasuo
Ide Masao
Kobayashi Hiroshi
Konno Shigeo
Fuji Photo Optical Co., Ltd.
Worrell Danny
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