Dentistry – Apparatus – Having motor or means to transmit motion from motor to tool
Reexamination Certificate
2003-08-26
2004-11-16
Manahan, Todd E. (Department: 3732)
Dentistry
Apparatus
Having motor or means to transmit motion from motor to tool
C433S127000
Reexamination Certificate
active
06817862
ABSTRACT:
FIELD OF THE INVENTION
This invention relates generally to ultrasonic dental tools and pertains more particularly to special micro endodontic ultrasonic surgical and dental tools having a water port.
BACKGROUND
In the last four to five years microdentistry began to develop. Microdentistry is the performing of dental surgery and procedures with very small tools under a microscope. As an example, in the preparation of root canals, it has been found that the tool must be very small in order to work in the small canal areas. Such small tools must also be very strong and tough and able to withstand and/or easily dissipate and/or resist heat.
In recent years ultrasonic tools have been developed which many dental surgeons have begun to use for many operations on teeth, bones, and soft tissue including dislodging and removal of dental material. These ultrasonic tools have been found to be particularly useful for microdentistry and particularly for use in root canals. Tools for this purpose must be small, hard, durable and heat resistant in order to satisfactorily perform their function. They must also be flushed with a fluid such as water to dissipate heat and flush away debris.
Recent years have seen greater use of ultrasonically powered instruments for the preparation of root canals. Examples of ultrasonically powered instruments of this type for the preparation of root canals are disclosed in U.S. Pat. No. 4,019,254, issued Apr. 26, 1977 to Malmin, U.S. Pat. No. 5,094,617 issued Mar. 10, 1992 to Carr and PCT Publication WO 86/05967. With the exception of the first mentioned patent, all tools are formed with a shaft tapered to a point. More recent examples of improved tools are disclosed in the applicant's recently issued U.S. Pat. No. 5,836,765, issued Nov. 17, 1998, and U.S. Pat. No. 5,868,570 issued Nov. 12, 1998 to Hickok.
Most dental tools and work areas are cooled with a continuous stream of water during use. Cooling in this manner is not always possible, particularly when working in certain small confined areas such as root canals, and in most instances this form of cooling is inconvenient.
In the past, fluid such as water has been supplied to the cutting tool by means of either a separate water supply such as a wand or the like, or a supply through or from the adjacent power unit. The tools normally used with ultrasonic generators are typically very small and must be hard and durable to withstand the high energy delivered by the ultrasonic generator. Due to the size and the materials from which the tools are made, it has not been possible to provide a through the tool fluid supply to the tool and word area.
One example of an earlier dental tool having a fluid supply to the tip is U.S. Pat. No. 3,924,335 dated Dec. 20, 1975. The patent discloses a metal or plastic transmission member which has a water feed to be used as a dental prophylaxis unit for removing deposits from tooth and gingival surfaces. However, this tool is not suitable for microdentistry.
U.S. Pat. No. 4,193,196 discloses a fluid supply unit for dental instruments wherein an instrument is shown with flow through tip. This tool is not disclosed as suitable for microdentistry.
U.S. Pat. No. 5,733,119 discloses a dental tool having fluid supply port in the hub of the tool. These tools of the prior art cannot be made sufficiently small to function as a microdentistry tool and provide the fluid port in the shaft of the tool at the working tip.
Therefore, there is a need for an improved ultrasonic dental tool formed of a suitable strong, flexible and durable heat resistant material with suitable fluid port for microdentistry.
Another drawback to these tools is that they are attached and detached from the hand piece of the ultrasonic generator by means of a threaded connection requiring a wrench or other special tool. This is particularly inconvenient because several different shape tools are frequently required during any particular operation.
Therefore, there is also a need for an improved ultrasonic dental tool having a quick attach connector for microdentistry.
SUMMARY OF THE INVENTION
A primary objective of this invention is to provide an improved ultrasonic dental tool having a tip that is formed of durable high strength heat resistant material and has a port for delivery of fluid to the tip.
Another objective is to provide a tool of a suitable material that can be made small enough for MICROENDODONTICS that has provision for delivery of a fluid to the tip.
In accordance with a primary aspect of the present invention a dental tool for use with an ultrasonic transducer comprises a substantially elongate tool defined by a shaft having a proximal end with means for attachment to an ultrasonic transducer, and a distal end having a tip configured for performing a dental procedure, an fluid passage extending from the proximal end to a port positioned and configured to direct fluid on the tip.
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Dentsply International Inc.
Manahan Todd #E.
Maria Carmen Santa
McNees Wallace & Nurick LLC
Miller Jonathan P.
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