Mani, Inc.

Mieko Akaba

Kanji Matsutani

Toshiyuki Takase

Masaki Mashiko

Satoshi Tetsuka

Hiroshi Yagisawa

Shoichi Fukuda

Kosuke Shinohara

Yuji Yokoyama

Masao Akatsuka

Hiroyuki Hagiwara

In an eyeless sewing needle, a periphery of an axial hole at the base end is heated to make a fibrous structure be a granular structure without directionality, and at least a part of a heat-affected zone made between the fibrous structure and the granular structure due to the heating is within a range that is three times the diameter of the sewing needle and that extends from an effective base of the axial hole towards the needlepoint. This allows provision of a flexible sewing needle so that the hole periphery can be processed while keeping a hard state at the position of the needlepoint slightly away from the axial hole.

Eyeless sewing needle and fabrication method for the same

A method for manufacturing an eyeless needle by which a satisfactory hole can be formed in the end surface of a fine suture needle having a needle diameter less than 150 micrometers is proposed. In a method for manufacturing an eyeless needle by forming a hole for inserting and fixing one end of a suture thread by caulking in the end surface of the eyeless suture needle made of stainless steel, the hole is formed by irradiating the end surface of a needle material thicker by 6 to 20 micrometers than a desired needle diameter of the suture needle less than 150 micrometers with one shot of a laser beam, and subsequently, a portion thicker than the desired needle diameter is removed by electrolytic polishing or chemical polishing.

Method of manufacturing an eyeless suture needle

Growing community of inventors

Tochigi, Japan

Mieko Akaba