Nakanishi Inc.

Nakanishi Dental Mfg. Co., Ltd.

Nakanishi Dental Mgf. Co., Ltd.

Eiichi Nakanishi

Sosaku Kawata

Masanori Mizunuma

Yuichi Shibata

Yukio Ito

A dental handpiece is disclosed which has a head housing, a gear shaft having a gear part with gear teeth and a shaft part extending from the gear part, and a dust control seal sealingly fit on the circumferential surface of the shaft part of the gear shaft. The dust control seal is an annular member, and has a seal body, a first lip projecting radially inwardly from the seal body, and a second lip projecting radially inwardly from the seal body above and spaced apart from the first lip, with a space defined between a contact area between the first lip and the shaft part, and a contact area between the second lip and the shaft part.

Dental handpiece

The present invention relates to a dental head unit capable of measuring a root canal length of a patient. The head unit includes a head section having a sleeve rotatably supported therein for detachably holding a cutting tool therein, a neck section extending proximally from the head section and having a proximal end for connecting to a handpiece body, a contact capable of detachably contacting the cutting tool for providing electric connection to the cutting tool when in contact, and a contact holder fixed to a proximal end of the contact and axially slidable with respect to the neck section. The contact holder has a lead attachment to which a lead for electrically connecting the contact to a root canal length measuring device is detachably attached. The present invention also relates to a contact holder assembly including the contact and the contact holder.

Dental head unit capable of measuring root canal length, and contact holder assembly therefor

A dental handpiece is disclosed for injecting an air-powder mixture and water against teeth for dental treatment. The handpiece includes a container for accommodating powders, an air supply line for supplying air into the container to produce an air-powder mixture in the container, a mixture transfer line for transferring the mixture, a water supply line for transferring water, and an injection nozzle for injecting the mixture and the water against a treatment site. The container has a curved inner surface for allowing whirl of air spatially in all directions in the container. The air supply line has a plurality of branched lines each extending in the central part of the container to close proximity to the curved inner surface of the container. Each of the branched lines has in its distal part a plurality of ports oriented to direct air flow therethrough along the curved inner surface of the container.

Dental handpiece for injecting therapeutic agent containing powders

A mechanism for a cutting or grinding tool for converting rotational movement into reciprocating movement contains a casing, a reciprocating member mounted within the casing for receiving and securing a tool to be inserted into a tool receiving opening of the reciprocating member, a shaft member rotatably mounted within the casing for rotation by a rotational driving force, a bearing member for rotatably carrying the shaft member, and a support member for carrying the reciprocating member for enabling reciprocating movement thereon. The reciprocating member and the shaft member are spaced apart so that a center axis of the reciprocating member and a center axis of the shaft member are offset. A connecting member is provided between the shaft member and the reciprocating member for interconnecting the shaft and reciprocating members for converting rotational movement of the shaft member into reciprocating movement of the reciprocating member. One end of the connecting member is slidably received and mounted in the shaft member at a position offset from the axis of the shaft member and the other end of the connecting member is slidably received and mounted in the reciprocating member at a position offset from the axis of the shaft member.

Mechanism for machining and grinding tool for converting rotational

A dental handpiece contains a tool for dental treatment operation, tool holding members for detachably and rotatably holding the tool, tool detachment members for abutting against the tool holding members to detach the tool from the tool holding members, and rotatable contact members capable of being point-contacted with the tool holding members. The rotatable contact members when contacted with the tool holding members is rotatable with the tool holding members.

Growing community of inventors

Kanuma, Japan

Eiichi Nakanishi