JP2009028192A - Stopper for cutting tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stopper for a cutting tool capable of getting a correct depth required in a medical treatment field, even when a few kinds of cutting tools are available, without the need of preparing many cutting tools. <P>SOLUTION: The stopper for the cutting tool is used by being fitted to the rotary shaft of the cutting tool having the rotary shaft, and includes a spiral locking member composed of a resin material and a clamping member made of a shape memory material, provided inside the locking member and capable of deforming the locking member by its shape recovering force. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a stopper for a cutting tool that is used for a cutting tool such as a drill having a rotating shaft or a root canal cutting tool to limit the cutting depth or use it as a guide for the cutting depth.

  Conventionally, as a dental prosthesis method in a missing tooth portion, a method using a bridge and a method using a denture have been generally performed. However, in the bridge method, healthy natural teeth on both sides of the missing tooth portion are cut into abutment teeth, and a metal body provided on a dental prosthesis located in the missing tooth portion is engaged with the abutment teeth. Because the abutment tooth bears the occlusal force that was originally applied to the missing tooth, it must be provided with an engaging part for cutting healthy natural teeth into abutment teeth. There was a drawback that the life of the natural tooth as a support was greatly shortened. In addition, the method using a denture is a method in which a resin or ceramic denture fixed to a floor made of a synthetic resin or the like is used as a dental prosthesis. In this method, the occlusal force acting on the dental prosthesis is used. Due to residual natural teeth and / or oral mucosa, which may cause discomfort while using a dental prosthesis or cover the taste receptors scattered in the oral mucosal tissue Taste dullness may occur, and further, there has been a serious drawback that long-term use causes absorption of the jaw crest.

  Therefore, as a treatment method to eliminate these disadvantages, an implant fixture that serves as a maintenance and stabilization device for a dental prosthesis is inserted into the insertion hole formed in the jawbone of the missing tooth, and the function of the root of the natural tooth is substituted. A dental prosthesis maintenance device by connecting and fixing a dental prosthesis fixing device to the inside of the oral cavity of the implant fixture, and fixing the dental prosthesis to the dental prosthesis maintenance device Has been developed and implemented.

  In this implant treatment, it is important to accurately form a hole for embedding the fixture in the jawbone. Therefore, the tomography of the patient's jawbone is imported into a computer, and the fixture insertion direction is determined based on data that accurately simulates the completed state of the prosthetic device including the fixture by determining the fixture insertion direction in advance. A method has been developed in which a surgical template having a hole formed therein is manufactured, the surgical template is mounted in the patient's oral cavity, and a drill is used in accordance with the direction of the hole formed in the surgical template. (For example, refer to Patent Document 1). At this time, the direction of the embedding hole is defined by the surgical template, and the depth of the embedding hole is defined by a flange-like stopper formed integrally with the rotating shaft on the rotating shaft of the cutting drill.

  However, since this treatment method requires the use of a flanged cutting tool, many dentists who have a cutting tool that does not have a stopper formed on the conventional rotating shaft are capable of cutting at various cutting depths. It was necessary to purchase new ingredients.

JP 2005-518834 A

  Accordingly, an object of the present invention is to provide a stopper for a cutting tool that enables treatment using a surgical template even if the cutting tool has no stopper formed on a conventional rotating shaft.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors are a cutting tool in which a stopper is not formed on a conventional rotating shaft by supplying only a stopper as a separate body from the cutting tool. Focusing on the fact that treatment using a surgical template is possible, and that surgical cutting tools are always heat sterilized before use, shape memory materials that recover their shape at the temperature used for heat sterilization are used as stoppers for cutting tools. When used, the present invention was completed by finding that the stopper for the cutting tool can be firmly fixed to the rotating shaft of the cutting tool after heat sterilization.

  That is, the present invention is a stopper used by being fitted to a rotating shaft of a cutting tool having a rotating shaft, and is formed of a spiral locking material made of a resin material and a shape memory material, and an inside of the locking material. There is a stopper for a cutting tool which is composed of a fastening material capable of deforming the locking material with its shape recovery force.

  The stopper for a cutting tool according to the present invention enables a treatment using a surgical template even for a cutting tool in which a stopper is not formed on a conventional rotating shaft, and further uses a cutting drill or a root canal cutting tool. It is an excellent stopper for a cutting tool that does not easily shift in position.

Hereinafter, the stopper for a cutting tool according to the present invention will be described with reference to the drawings.
FIG. 1 is a perspective explanatory view showing a state before heating of one embodiment of a stopper for a cutting tool according to the present invention. FIG. 2 is an explanatory perspective view showing an example of a cutting tool to which a stopper for the cutting tool is attached.

  In the drawings, reference numeral 1 denotes a stopper for a cutting tool according to the present invention, which is used by being fitted to a rotating shaft 2a of a cutting tool 2 as exemplified in FIG. The cutting tool 2 can be used without particular limitation as long as it has a so-called drill shape having a rotating shaft, and the rotating shaft may or may not have cutting teeth.

  The stopper 1 for a cutting tool according to the present invention has a spiral locking material made of a resin material and an inside of the locking material made of a shape memory material, and can deform the locking material by its shape recovery force. It consists of possible fastening materials.

  The locking member 1a is made of a plastic material such as plastic or rubber, and is used so as to surround the rotating shaft 2a of the cutting tool 2. The shape of the locking material 1a is spiral in the state where there is no influence from others, and the shape of the locking material 1a itself is changed by a fastening material 1b to be described later. As shown in FIG. 1, the locking member 1 a is preferably a plate having a thickness in the direction of the rotating shaft 2 a, so that the locking member 1 a is more reliably fitted to the rotating shaft.

  The locking member 1a is fitted on the rotating shaft 2a by a fastening member 2 having a shape memory ability to be described later. The stopper 1 for a cutting tool according to the present invention uses the heat at the temperature of heat sterilization (about 130 ° C.) to restore the fastening material 1b having shape memory ability so as to fasten the rotating shaft. The material is also preferably a heat-resistant resin such as polypropylene, polycarbonate, polyarylate, polysulfone, polyphenylene sulfide, polyether ether ketone, polyimide resin, fluororesin, etc., especially polyamide imide and polyether ether ketone are 250 ° C. or higher. It is preferable because of its heat resistance.

  The fastening material 1b is made of a shape memory material. For example, as shown in FIG. 1, one fastening member 1b may be arranged inside the locking member 1a, or a plurality of fastening members 1b may be arranged if necessary.

  The fastening material 1b deforms the locking material 1a with its shape recovery force. The fastening material 1b gives a memory so that the spiral locking material 1a is in close contact with the rotating shaft 2a without contraction and shrinks, and the shape of the locking material 1b is restored by heating during sterilization. The stopper 1 for a cutting tool is fitted to the rotating shaft 2a. That is, in the case of the cutting tool stopper illustrated in FIG. 1, the fastening material 1b is memorized so that the cutting tool stopper 1 is deformed into a substantially cylindrical shape having a hole smaller than the rotation shaft 2a after heating. Keep it. The fastening material 1b is also preferably a shape memory alloy having a shape restoration temperature of about 50 to 100 ° C. because it is necessary to withstand heating in the same manner as the locking material 1a.

  The method for using the stopper for a cutting tool according to the present invention is as follows. First, in order to make it easier to attach the spiral cutting tool stopper 1 to a predetermined position of the rotary shaft 2a of the cutting tool 2, the spiral is opened at room temperature. It is transformed into a shape that can be wound around 2a. After determining the cutting depth of the cutting tool, the operator winds a cutting tool stopper around the rotary shaft 2a. At this time, the central part of the spiral is pressed and deformed, for example, from the left and right with pliers or a dedicated tool, and temporarily fixed. Prior to use of the cutting tool, sterilization is performed at a temperature of about 80 to 150 ° C. in a heat sterilizer such as an autoclave or a drying oven according to a conventional method. After the sterilization process, the stopper 1 for the cutting tool is securely fitted to the rotary shaft 2a by the restoring force of the shape memory material 1b, so that the position is not easily shifted during use. After using the cutting tool, the stopper for the cutting tool is removed from the rotating shaft by opening the vortex again with pliers or a special tool and deforming it, and is stored until the next use after cleaning.

  The stopper for a cutting tool according to the present invention can be used not only for a cutting drill for an implant, but also for a stopper conventionally used for limiting the depth, such as a dental root canal cutting tool. .

The perspective explanatory view which shows the state before the heating of 1 Example of the stopper for cutting tools which concerns on this invention. The perspective explanatory view which shows an example of the cutting tool which attaches the stopper for cutting tools.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stopper for cutting tools 1a Locking material 1b Fastening material 2 Cutting tool 2a Rotating shaft

Claims (1)

  A stopper fitted to the rotary shaft (2) of the cutting tool (2) having the rotary shaft (2a). The stopper includes a spiral locking member (1a) made of a resin material and a shape memory material. A cutting tool stopper (1) comprising a fastening material (1b) which is inside the fastening material (1a) and can deform the locking material (1a) by its shape recovery force.

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