KR101628648B1

KR101628648B1 - Detachable medical cutting tools

Info

Publication number: KR101628648B1
Application number: KR1020160033421A
Authority: KR
Inventors: 황적희
Original assignee: 황적희
Priority date: 2016-03-21
Filing date: 2016-03-21
Publication date: 2016-06-08

Abstract

The present invention can reduce the material of the main constituent part by constituting the structure and material of the shank part and the cutting part in a double structure to improve the economical efficiency and facilitate the detachment and attachment, And to minimize the frictional heat and to prevent damage to the tissue due to frictional heat of the cutting edge during the procedure. According to the present invention, there is provided a medical cutting mechanism coupled to a high-speed rotating mechanism for drilling a bone tissue of a human body, comprising: a shank portion having a connecting portion at one side; A cutting edge portion formed as an engaging portion detachably engaged with a connecting portion of the shank portion; A rotation preventing part formed between the connecting part of the shank part and the engaging part of the cutting edge part to prevent rotation in the rotating direction; And a coupling force holding means configured to maintain a coupling force when coupling between the coupling portion of the shank portion and the coupling portion of the cutting edge, wherein the shank portion is made of stainless steel, and the cutting edge portion is made of a zirconia (ceramic) A cutting tool is provided.

Description

{DETACHABLE MEDICAL CUTTING TOOLS}

The present invention relates to a medical cutting tool such as a dental, a surgical or a veterinary medical instrument, and more particularly, to a cutting tool having a double structure in which a shank portion and a cutting portion are made of a double structure, Which is capable of securing an excellent bonding force in a coupled state and having excellent durability and cutting power and minimizing frictional heat and preventing deterioration of the tissue due to frictional heat of the cutting edge portion during a procedure, To a medical cutting tool.

In recent years, implant treatment has become popular during the dental treatment, which is a universal procedure. The implant treatment involves implanting a screw-shaped artificial tooth fixture made of titanium material at a portion where the tooth has been lost, This is an advanced procedure that can restore the original function of the tooth by fixing the prosthesis such as an artificial tooth or the like after fusing the bone with the bone for a period of time and then connecting an abutment which is a connecting member thereon.

1 is a longitudinal sectional view showing an example of a conventional medical cutting mechanism.

As shown in Fig. 1, a drill 1 for drilling a hole in the alveolar bone is used for placing the implant, which is most often used among the cutting tools used in the implant dental treatment.

The prior art drill 1 is made of a metal material and includes a shank portion 2 for being connected to a handpiece (not shown) of a high-speed rotating mechanism and a cutting portion 2 for cutting a hole in the alveolar bone And the blade part 3 is integrally formed.

In using the metal drill 1, it is necessary to use a drill having a proper diameter in accordance with the implant condition so as not to damage the bone tissue caused by the frictional heat, and the drilling operation must be carefully performed. If a large amount of frictional heat is generated in the cutting edge portion (3) of the drill during drilling, the bone tissue inside the tooth due to frictional heat is greatly damaged. If the heat is not generated above 43.5 ° C, It does not interfere with fusion.

In this way, in order to minimize the frictional heat of the dental cutting tool, the rotational RPM of the cutting tool is adjusted to minimize the generation of frictional heat. That is, when performing drilling using a drill, a hole is first made in the implant site with a rotational speed of 1,000 to 1,500 RPM and a torque of 35 Ncm or less, and a drill with a larger diameter is used to drill 500 to 800 RPM , 300 ~ 400 RPM in order of RPM is lowered by minimizing the generation of frictional heat.

However, this method is a method that depends on the skill of the practitioner. If the procedure is mistaken, the bone tissue is severely damaged by frictional heat, and the implant is adversely affected by osseointegration, so that the implant operation may fail.

As another method, cooling water such as cold physiological saline or the like is sprayed in order to reduce frictional heat generated in a conventional drilling process, thereby minimizing the frictional heat of the cutting tool.

However, since the saline sprayed with the coolant and the powder generated during the drilling operation can be swallowed by the patient during the procedure, it is possible to restrict the use of the saline solution for cooling to a minimum amount so that the frictional heat of the cutting edge portion (3) There is a problem and more careful attention is required.

In addition, a cutting tool such as a drill for drilling which is used in a conventional implant operation uses a drill made of, for example, stainless steel (hereinafter referred to as "SUS " However, since the cutting tool made of SUS has a high SUS thermal conductivity (about 70 W / mc), frictional heat is generated at a temperature higher than the body temperature when the hole for inserting the implant or fixture is formed in the alveolar bone. This is inevitable.

When a cutting tool such as a drill such as a SUS material is used as described above, if the frictional heat at a high temperature is directly transferred to the alveolar bone nerve cell, the necrosis of the cell (the alveolar bone necrosis may occur at a temperature above 43.5 DEG C) Since the osseointegration is not performed properly after the insertion, loosening phenomenon frequently occurs when the implant is shaken and dropped.

In addition, although the conventional medical cutting tool is made of a relatively hygienic SUS material, the surface of the cutting tool may gradually corrode due to frequent washing and sterilization (sterilization by the AutoClave device) caused by repeated use , And some patients may suffer from an allergic reaction caused by a metal material such as SUS material. Since the SUS material has a relatively high thermal conductivity, even if it is subjected to cooling treatment as a saline solution, the heat is not readily dissipated and is accumulated therein, so there is a high possibility that the bone tissue due to the frictional heat generated in the continuous drilling operation is damaged (necrosis) .

In order to solve these problems, a drill made of a ceramic material (zirconia) is generally used as a cutting tool in order to replace the drill made of SUS.

The zirconia material is excellent in chemical resistance and corrosion resistance, and is a biocompatible material, so that side effects such as metal allergy phenomenon do not occur. In addition, since the cutting efficiency is good and the friction coefficient is low during drilling, frictional heat is less than that of SUS material during high-speed rotation, and therefore drilling operation can be performed at a level at which almost no cooling water such as saline is used.

However, the disadvantage of the conventional integral zirconia drill is that it is easily broken by brittleness caused by high hardness, and in particular, since the shank portion and the cutting edge portion are integrally formed, There is a problem that the shank portion repeatedly connected is easily damaged or the boundary portion with the cutting edge portion is broken and broken.

In addition, since the conventional integrated zirconia drill is manufactured by the powder compression sintering method, the manufacturing cost is very high, which is an obstacle to the expansion of the use of the integral type ceramic drill. As a result, in dentistry, it is very difficult to widely use zirconia drills, which can exhibit many advantages in application of the implant, by avoiding the use of relatively expensive zirconia drills than those of SUS drills.

Accordingly, there is a demand for a new cutting tool for dental use, external use, and veterinary use having a durability that can be reused for a long time by connecting to a high-speed rotation mechanism while generating frictional heat at a minimum.

(Document 1) Utility Model New Publication No. 20-0434629 (Dec. 18, 2006) (Document 2) Utility Model No. 20-0300750 (2002. 30, 2002)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a shank structure and a cut- An object of the present invention is to provide a detachable medical cutting tool capable of securing an excellent bonding force, having excellent durability and cutting power, minimizing frictional heat, and preventing tissue damage due to frictional heat of a cutting edge during a procedure. have.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide an apparatus and method for controlling the same.

According to an aspect of the present invention, there is provided a cutting tool for cutting a bone tissue of a human body coupled to a high-speed rotating mechanism, the cutting tool including a shank portion having a connection portion on one side, a shank portion; A cutting edge portion formed as an engaging portion detachably engaged with a connecting portion of the shank portion; A rotation preventing part formed between the connecting part of the shank part and the engaging part of the cutting edge part to prevent rotation in the rotating direction; And a coupling force holding means configured to maintain a coupling force at the time of coupling between the connecting portion of the shank portion and the coupling portion of the cutting edge portion, wherein the shank portion is made of stainless steel, and the cutting edge portion is made of a ceramics material (zirconia material) A medical cutting mechanism is provided.

According to an embodiment of the present invention, the engaging force holding means includes a coupling groove formed in one of a coupling portion of the shank portion and a coupling portion of the cutting blade portion; A coupling protrusion having a cross-sectional shape corresponding to a cross-sectional shape of the coupling groove, the coupling protrusion being formed on the other of the coupling portion of the shank portion and the coupling portion of the cutting blade portion; A coupling force holding member that is seated on one of the coupling groove and the coupling projection; And a seating groove formed on the other one of the coupling groove and the coupling projection and on which the coupling force holding member is seated when the coupling portion and the coupling portion are engaged.

In the present invention, the coupling force holding member may be formed of a C-ring or a cut annular ring whose ends are partially stitched to each other, or may be made of an O-ring.

In the present invention, when the coupling force holding member is formed of a C ring or a cut ring, the C ring or the cut annular ring may have an outer diameter larger than the diameter of the coupling groove so as to be seated on the coupling projection.

In the present invention, when the coupling force holding member is formed of a C ring or a cut ring, the C ring or the cut ring may have an inner diameter smaller than the diameter of the coupling protrusion and may be seated in the coupling groove.

According to an embodiment of the present invention, the coupling protrusion may be formed to be tapered toward the end, and the coupling groove may be formed to be tapered corresponding to the coupling protrusion, and the seating groove may be formed on the inner surface of the coupling groove.

In the present invention, the holding force holding member is composed of a C ring or a cut annular ring whose ends are mutually staggered, and the C ring or the cut annular ring or the O ring is roundly divided into two sections, And the like.

In the present invention, the C-ring or the cut annular ring or the O-ring may be eccentrically formed so that an elastic force acts on one side in a plane.

In the present invention, the coupling force holding member may be formed of an annular plate spring.

In the present invention, when the C-ring or the cut annular ring is provided in the engaging projection, a tooth-shaped concave-convex portion is formed on the inner diameter of the C-ring or the cut annular ring, The projections of the protrusions may be provided with serrated irregularities.

In the present invention, one of the connecting portion of the shank portion where the coupling groove is formed and the coupling portion of the cutting edge portion is formed by cutting at least two or more, and the coupling groove may be formed in a linear shape or a sloped shape have.

The fixing unit may further include fixing means for fixing the connection portion and the coupling portion, wherein the fixing means includes at least one fixing hole penetrating in a direction orthogonal to the coupling groove and having a threaded portion formed on the inner surface thereof, And a coupling member screwed through the fixing hole.

In the present invention, the rotation preventing portion may have an elliptical shape or a partially cut circular shape or polygonal shape at one end of the connection portion and one end of the coupling portion, or may have a cross-sectional shape of sawtooth irregularities.

The above-described detachable medical cutting mechanism according to the present invention provides the following effects.

First, the present invention can be configured to have a double structure in which a structure and material of a shank portion and a cutting portion of a cutting tool used in medical treatment for drilling a hole are detachable, thereby reducing the material of a relatively expensive main constituent portion, It is effective.

Secondly, according to the present invention, the cutting part, which is a constituent part for performing cutting, is made of a high-density ceramic material (zirconia material) such as stainless steel and stabilized zirconia or alumina with a low friction coefficient to improve durability and cutting force, It is possible to prevent the damage of the bone tissue due to the frictional heat of the cutting edge portion generated in the procedure.

Thirdly, the present invention can prevent deterioration of the shaking part even if the shank part is made of a metal material and repeatedly attached and detached, which is coupled to the high-speed rotation mechanism, and detachably attaches the two parts, So that the reliability and economical efficiency of the product can be improved.

Fourthly, the present invention is intended to prevent the occurrence of side effects such as the metal allergy phenomenon of the patient, to allow the bone fusion to be performed well after the procedure, and to perform the drilling operation at a level at which almost no cooling water such as saline is used There is an effect that can be done conveniently.

The effects of the present invention are not limited to those mentioned above, and other solutions not mentioned may be clearly understood by those skilled in the art from the following description.

1 is a longitudinal sectional view showing an example of a conventional medical cutting mechanism.
2 is a view showing a detachable medical cutting mechanism according to a first embodiment of the present invention.
3 is a view showing an example of a holding force holding member constituting a detachable medical cutting mechanism according to the first embodiment of the present invention.
FIG. 4 is a view showing another example of a holding force holding member constituting a detachable medical cutting mechanism according to the first embodiment of the present invention. FIG.
5 is a view showing examples of a rotation preventing portion constituting a removable medical cutting mechanism according to the first embodiment of the present invention.
6 is a view showing a detachable medical cutting mechanism according to a second embodiment of the present invention.
7 is a view showing a detachable medical cutting mechanism according to a third embodiment of the present invention.
8 is a cross-sectional view showing a coupling relationship of the detachable medical cutting mechanism according to the third embodiment of the present invention.
FIG. 9 is a plan view and (b) is a side view of an example of a holding force holding member constituting a detachable medical cutting mechanism according to a third embodiment of the present invention. FIG.
10 is a view showing a partial configuration of a modified example of the removable medical cutting mechanism according to the third embodiment of the present invention.
11 is a view showing a detachable medical cutting mechanism according to a fourth embodiment of the present invention.
12 is a view showing a part of the structure of a detachable medical cutting mechanism according to a fourth embodiment of the present invention.

Further objects, features and advantages of the present invention will become more apparent from the following detailed description and the accompanying drawings.

Before describing the present invention in detail, it is to be understood that the present invention is capable of various modifications and various embodiments, and the examples described below and illustrated in the drawings are intended to limit the invention to specific embodiments It is to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Also, the terms " part, "" unit," " module, "and the like, which are described in the specification, refer to a unit for processing at least one function or operation, Software. &Lt; / RTI >

In the following description of the present invention with reference to the accompanying drawings, the same components are denoted by the same reference numerals regardless of the reference numerals, and redundant explanations thereof will be omitted. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detachable medical cutting mechanism according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, a detachable medical cutting mechanism according to a first embodiment of the present invention will be described in detail with reference to FIGS. 2 to 5. FIG. FIG. 2 is a view showing a detachable medical cutting mechanism according to a first embodiment of the present invention, FIG. 3 is a view showing an example of a holding force holding member constituting a detachable medical cutting mechanism according to a first embodiment of the present invention FIG. 4 is a view showing another example of a coupling force holding member constituting a removable medical cutting mechanism according to the first embodiment of the present invention, and FIG. 5 is a perspective view of a detachable medical cutting mechanism according to the first embodiment of the present invention And Fig.

As shown in Figs. 2 to 5, the detachable medical cutting mechanism according to the first embodiment of the present invention is a medical cutting mechanism for cutting a bone tissue of a human body coupled to a high-speed rotation mechanism, a shank portion 100 connected to a handpiece (not shown) and having a connecting portion 110 at one end thereof; A cutting edge portion 200 having an engaging portion 210 detachably coupled to a connecting portion of the shank portion 100 and having an outer surface formed with a drill bit; A rotation preventing part 300 formed between the coupling part 110 of the shank part 100 and the coupling part 210 of the cutting blade part 200 to prevent or restrict rotation of the cutting mechanism in the rotation direction during rotation; And a coupling force holding means configured to maintain a coupling force when coupling the coupling portion 110 of the shank portion 100 and the coupling portion 210 of the cutting blade portion 200.

The shank portion 100 is made of stainless steel (hereinafter referred to as "SUS") so as to have durability in the process of repeatedly attaching and detaching it to a handpiece or the like, and a TRIMRITE (UNS S42010) It is preferable that it is made of an equivalent material. As described above, the shank portion 100 made of SUS material can be used for a long time without being damaged, even if the shank portion 100 of SUS material having high durability is repeatedly attached to and detached from the handpiece.

The cutting edge portion 200 is made of a high-density zirconia (ceramic) material having a low coefficient of friction and is preferably composed of zirconia, stabilized zirconia, or alumina. In addition, the cutting edge portion 200 may be formed of a high-density cemented carbide (sintered carbide alloy) having a low coefficient of friction. Zirconia is a new material developed recently, and it has excellent physical properties overcoming brittleness which is the biggest defect of general ceramics. Such materials such as zirconia, stabilized zirconia or alumina are produced by powder compression molding and sintering at a high temperature, or they are manufactured through artificial sapphire production methods (for example, a scullmelt method) And exhibits a lower coefficient of friction than that of SUS material, and is excellent in chemical resistance and corrosion resistance, and is a human-friendly material.

Since the cutting edge portion 200 made of zirconia (ceramic) material is made of high density and has a low coefficient of friction, the frictional heat generated during the high-speed rotation hole drastically decreases compared with that of SUS. Thus, there is no need for a cooling operation for spraying coolant such as saline And does not cause side effects such as metal allergies in the process of processing holes in bone tissue. In particular, for example, in a dental procedure, the alveolar nerve structure can be precisely and delicately drilled without fear of being damaged by frictional heat, and the processed surface is also very good, so that bone fusion can be performed well after implant placement.

The rotation preventing portion 300 for preventing or restricting the rotation of the cutting tool in the rotating direction during the rotation of the cutting tool 200 may be formed by a coupling portion 110 of the shank portion 100 and a coupling portion 210 of the cutting blade portion 200 The lower end of the coupling part 110 and the lower end of the coupling part 210 may have an elliptical shape or a partially cut circular or polygonal shape.

5, the anti-rotation part 300 may have an elliptical shape as shown in FIG. 5A, a triangular shape, a rectangular shape, a pentagonal shape, and a hexagonal shape as shown in FIGS. 5B to 5E. The same polygon, as shown in Fig. 5 (f), and the like.

The coupling structure having such a cross-sectional shape allows the shank portion 100 and the cutting edge portion 200 to be constrained in the rotational direction, thereby being able to rotate integrally and firmly.

The engaging force holding means is formed in the engaging groove 410 formed in the connecting portion 110 of the shank portion 100 and the engaging portion 210 of the cutting edge portion 200, A coupling protrusion 420 formed to have a sectional shape corresponding to a sectional shape of the coupling groove 410 and the coupling protrusion 420 and a coupling force holding member 430 that is seated on one of the coupling groove 410 and the coupling protrusion 420, And a seating groove 440 formed on the other one of the coupling protrusions 410 and 420 and on which the coupling force holding member 430 is seated.

In the first embodiment, the coupling force holding member 430 is provided in the coupling protrusion 420 of the coupling part 210, the seating groove 440 is formed in the coupling groove 410 of the coupling part 110, have.

The coupling force holding member 430 may be formed of an annular ring whose end portions are staggered with each other by cutting a C ring or a part of a predetermined material, or an O-ring.

Here, when the coupling force holding member 430 is formed of a C ring or an annular ring whose end portions are staggered, the C ring or the annular ring in which the end portions are staggered is configured to exert an elastic force radially outward. In other words, the C-ring or the annular ring in which the ends are staggered is configured to have an outer diameter larger than the diameter of the coupling groove 410 and to be seated on the coupling projection 420.

The annular ring (hereinafter, referred to as "annular ring") in which the C rings or end portions are staggered is configured to have an outer diameter larger than the diameter of the coupling groove 410 and to be seated on the coupling projection 420, The C ring or the cut annular ring is contracted in the process of coupling between the coupling part 110 and the coupling part 210. When the coupling part 110 and the coupling part 210 are completely joined, And can be firmly fixed to the coupling groove 410 of the coupling part 210 by restoring (restoring).

Next, a detachable medical cutting mechanism according to a second embodiment of the present invention will be described in detail with reference to FIG. 6 is a view showing a detachable medical cutting mechanism according to a second embodiment of the present invention. In the following description of the second embodiment, for the sake of simplicity and clarity of description, the same components as those of the first embodiment described above are denoted by the same reference numerals, and a detailed description thereof will be omitted or omitted.

The detachable medical cutting mechanism according to the second embodiment differs from the first embodiment in the coupling force maintaining means in the configuration of the coupling portion of the shank portion and the coupling portion of the cutting portion.

6, the coupling force holding means in the detachable medical cutting mechanism according to the second embodiment includes coupling protrusions 420 formed at the coupling portion 110 of the shank portion 100, A coupling groove 410 formed in the coupling portion 210 of the coupling protrusion 420 and having a sectional shape corresponding to the sectional shape of the coupling protrusion 420 and a coupling groove 410 formed in one of the coupling groove 410 and the coupling protrusion 420 And a seating groove 440 formed on the other one of the coupling groove 410 and the coupling projection 420 and on which the coupling force holding member 430 is seated.

In the second embodiment, the coupling force holding member 430 is provided on the coupling protrusion 420 of the coupling part 110 and the seating groove 440 is formed on the coupling groove 410 of the coupling part 210 have.

The coupling force holding member 430 may be made of a C ring or a cut circular ring of a predetermined material or may be made of an O-ring as in the first embodiment.

Here, when the coupling force holding member 430 is a C ring or a cut annular ring, the C ring or the cut annular ring is configured to exert an elastic force radially outward. In other words, the C-ring or the cut annular ring is configured to have an outer diameter larger than the diameter of the coupling groove 410 and to be seated on the coupling projection 420.

In the drawings of the first and second embodiments, a C ring or a cut annular ring is seated on the engaging projection 420, but the C ring or the cut annular ring is seated in the engaging groove 410 Lt; / RTI > At this time, the C-ring or the cut annular ring is configured to have an inner diameter smaller than the diameter of the coupling protrusion 420 and to be seated in the coupling groove 410.

Since the C ring or the annular ring has an inner diameter smaller than the diameter of the defect protrusions 420 and is received in the coupling groove 410, The C ring or the cut annular ring is expanded and the C ring or the cut annular ring is restored (shrunk and restored) to the original state in a state where the coupling part 110 and the coupling part 210 are completely joined, 420, respectively.

Next, a detachable medical cutting mechanism according to a third embodiment of the present invention will be described in detail with reference to FIGS. 7 to 9. FIG. 8 is a cross-sectional view showing an engaging relationship of a detachable medical cutting mechanism according to a third embodiment of the present invention, and Fig. 9 is a cross-sectional view showing the detachable medical cutting mechanism according to the third embodiment of the present invention. (A) is a plan view and (b) is a side view of an example of a holding force holding member constituting a detachable medical cutting mechanism according to a third embodiment of the present invention.

In the following description of the third embodiment, for simplicity and clarity of description, the same components as those of the first embodiment described above are denoted by the same reference numerals, and a detailed description thereof will be omitted or omitted.

The detachable medical cutting mechanism according to the third embodiment differs from the first embodiment in terms of the coupling force holding means of the connecting portion of the shank portion and the coupling portion of the cutting portion.

7 to 9, in the detachable medical cutting mechanism according to the third embodiment, the engaging force holding means includes an engaging groove 410 formed in the connecting portion 210 of the shank portion 100, A coupling protrusion 420 formed on the coupling portion 210 of the coupling groove 410 and having a sectional shape corresponding to the sectional shape of the coupling groove 410 and a coupling protrusion 420 formed on the coupling groove 410 and the coupling protrusion 420, And a seating groove 440 formed on the other one of the coupling groove 410 and the coupling projection 420 and on which the coupling force holding member 430 is seated, The coupling protrusions 420 are tapered toward the coupling side, and the coupling grooves 410 are tapered corresponding to the coupling protrusions 420.

In the third embodiment, the coupling force holding member 430 is provided in the coupling protrusion 420 of the coupling part 210 and the seating groove 440 is formed in the coupling groove 410 of the coupling part 210 have.

The coupling force holding member 430 may be made of a C ring or a cut circular ring of a predetermined material or may be made of an O-ring as in the first embodiment. In the third embodiment, the C ring or the cut annular ring may have a two-step structure having different radii of curvature at both ends and different diameters. In other words, the C-ring or the cut annular ring has a rounded cross-sectional shape in two stages, and the seating groove 440 in which the C-ring or the cut annular ring is seated is formed with a corresponding cross-sectional shape. Since the C ring or the cut annular ring has a stepped cross-sectional shape in two stages, it is possible to secure the coupling property in the coupling direction and to realize a firm fixing in a direction orthogonal to the coupling direction.

Further, the C-ring or the cut annular ring is eccentrically formed so that an elastic force acts on one side in the plane. For example, the coupling force holding member is formed of a C ring of a leaf spring, a cut annular ring, or an O-ring.

As described above, since the C ring or the cut ring is eccentrically formed so as to exert an elastic force to one side (the shank portion side to be coupled with the rotation mechanism) in the plane, in the process of coupling the C ring or the cut ring, And is restored to its original position by the resilient restoring force when the engagement is completed in the seating groove 440. At this time, the practitioner can feel that the C-ring or the cut annular ring has a click feeling to be restored, so that the stable coupling is achieved. When the operator performs the operation in a state where the C-ring or the cut ring is eccentric, the elastic force acts on the eccentric amount in the direction of perforation. Thus, the operation is easy and the patient is less painful .

These structural features can be applied in combination in the above-described embodiments and the embodiments described later.

Although the coupling protrusion 420 is formed in the coupling part 210 of the cutting edge part 200 and the coupling groove 410 is formed in the coupling part 110 of the shank part 100 in the third embodiment, And as described above, it is configured to have a shrinking elastic force or an expanding elastic force depending on a position where the C ring or the cut annular ring is provided, as described above.

Specifically, when the C-ring or the cut annular ring 430 is provided on the engaging projection 420, the C-ring or the cut annular ring is configured to have an outer diameter larger than the diameter of the seating groove 440, Ring or cut annular ring 430 is provided in the engaging groove 410, the C-ring or the cut annular ring may be configured to have an inner diameter smaller than the diameter of the seating portion of the engaging projection 420 So as to be seated in the coupling groove 410.

11 shows a partial configuration of a modification of the detachable medical cutting mechanism according to the third embodiment of the present invention. When a C ring or a cut annular ring is provided in the engaging projection 420, the C ring or the cut annular ring Like concave and convex portions 431 are formed on the inner circumference of the coupling ring 430 and the seating surfaces of the coupling projections 420 to which the C ring or cut ring 421 is coupled are provided with tooth- Is formed.

The coupling force between the coupling force holding member 430 and the coupling protrusion 420 can be more firmly maintained and even when the coupling force holding member 430 is provided in the coupling groove 440 Can be applied. In the case of being applied to the engaging groove 440, the engaging force holding member 430 has a tooth-like concave-convex portion formed on the outer diameter thereof, and a tooth-like concave-convex portion corresponding thereto is formed on the seating face of the engaging groove 440. This configuration can be applied in combination to other embodiments.

Next, a detachable medical cutting mechanism according to a fourth embodiment of the present invention will be described in detail with reference to FIGS. 11 and 12. FIG. FIG. 11 is a view showing a detachable medical cutting mechanism according to a fourth embodiment of the present invention, and FIG. 12 is a view showing a part of the structure of a detachable medical cutting mechanism according to a fourth embodiment of the present invention.

In the following description of the fourth embodiment, for simplicity and clarity of description, the same components as those of the above-described embodiments are designated by the same reference numerals, and a detailed description thereof will be omitted or omitted.

The detachable medical cutting mechanism according to the fourth embodiment differs from the first embodiment in terms of the coupling force holding means of the coupling portion of the shank portion and the coupling portion of the cutting portion.

11 and 12, in the detachable medical cutting mechanism according to the fourth embodiment, the engaging groove 410 formed in the connecting portion 110 of the shank portion 100, A coupling protrusion 420 formed on the coupling portion 210 of the coupling groove 410 and having a sectional shape corresponding to the sectional shape of the coupling groove 410 and a coupling protrusion 420 formed on the coupling groove 410 and the coupling protrusion 420, And a seating groove 440 formed on the other one of the coupling groove 410 and the coupling projection 420 and on which the coupling force holding member 430 is seated, And the coupling portion 110, in which the coupling groove 410 is formed, is formed by being cut into two or more.

The coupling groove 410 formed in the connection portion 110 may be linearly formed as shown by "A" as shown in FIG. 10, and may be formed to be inclined as shown by "B". At this time, the engaging projection 420 is formed with a cross-sectional shape corresponding to the engaging groove 410.

In the fourth embodiment, the connecting portion 110 and the coupling portion 210 are shown as being formed in the shank portion 100 and the cutting edge portion 200, respectively, but they may be formed in the opposite manner. .

Meanwhile, the detachable medical cutting mechanism of the present invention further includes fixing means for loosening or more firmly fixing the coupling between the coupling portion 110 and the coupling portion 210. [

1 and 5, the fastening means may include one or more fasteners (not shown) extending from the outer surface of the connecting portion 110 of the shank portion 100 in a direction orthogonal to the engaging groove 440 and having threaded portions formed on the inner surface thereof, And an engaging member 520 for pressing and fixing the engaging projection 420 to the engaging projection 420 through the hole 510 and the fixing hole 510 of the shank portion 100.

A plurality of engaging holes may be formed in the engaging projection 420 of the cutting edge portion 200 along the circumferential direction to which the engaging member 520 can be engaged.

Preferably, the coupling member 510 is a bolt, preferably a mild bolt.

In the meantime, it is preferable that a position indicating portion indicating the position of the engaging hole formed in the engaging projection 220 is formed on the outer surface of the lower cutting edge portion 200 of the engaging projection 420. The position display unit may be formed of a scale.

In other words, a position indicating portion indicating a position where the engaging hole is formed is formed on the outer surface of the cutting edge portion 200 of the imaginary salient line passing through the center of the engaging hole of the engaging projection 420, 410, the engaging hole formed in the engaging projection 420 can be easily grasped, so that the fixing operation of the engaging member 520 can be performed more easily.

The above-described detachable medical cutting mechanism according to the present invention is configured to have a double structure in which detachable detachable structure and material of the shank portion and the cutting portion of the cutting tool used in medical treatment for perforation of the hole are cut, thereby reducing the material of the relatively- And the cutting part, which is a constituent part for cutting, is made of a high-density ceramic material of low friction coefficient such as stainless steel and zirconia or alumina to improve the durability and cutting force and to minimize frictional heat, It is possible to prevent the damage of the bone tissue due to the frictional heat of the cutting edge portion generated at the cutting edge portion.

Further, according to the present invention, even when the shank portion, which is a component coupled to the high-speed rotation mechanism, is made of a metal material and is repeatedly attached and detached, there is no possibility of damage thereof, and the two components are detachably coupled, Thereby improving the reliability and economical efficiency of the product. In addition, after the procedure, the osseointegration is performed well, the side effect such as the metal allergy phenomenon of the patient is not caused at all, There is an advantage that the drilling operation can be conveniently performed at a level that is rarely used.

The embodiments and the accompanying drawings described in the present specification are merely illustrative of some of the technical ideas included in the present invention. Therefore, it is to be understood that the embodiments disclosed herein are not for purposes of limiting the technical idea of the present invention, but rather are not intended to limit the scope of the technical idea of the present invention. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: shank portion
110:
200: cutting edge
210:
300:
410: Coupling groove
420: engaging projection
430:
440: seat groove
510: Fixing hole
520: Fixing member

Claims

1. A medical cutting mechanism coupled to a high-speed rotation mechanism for drilling a bone tissue of a human body,
A shank portion formed at one side with a connection portion;
A cutting edge portion formed as an engaging portion detachably engaged with a connecting portion of the shank portion;
A rotation preventing part formed between the connecting part of the shank part and the engaging part of the cutting edge part to prevent rotation in the rotating direction; And
And a coupling force holding means configured to maintain a coupling force when coupling between the coupling portion of the shank portion and the coupling portion of the cutting blade portion,
The shank portion is made of stainless steel,
Wherein the cutting edge portion is made of a zirconia material
Removable medical cutting tool.

The method according to claim 1,
The holding force holding means
A coupling groove formed in one of a coupling portion of the shank portion and a coupling portion of the cutting blade portion;
A coupling protrusion having a cross-sectional shape corresponding to a cross-sectional shape of the coupling groove, the coupling protrusion being formed on the other of the coupling portion of the shank portion and the coupling portion of the cutting blade portion;
A coupling force holding member that is seated on one of the coupling groove and the coupling projection;
And a seating groove formed on the other one of the coupling groove and the coupling projection and on which the coupling force holding member is seated when the coupling portion and the coupling portion are engaged,
Removable medical cutting tool.

The method of claim 2,
The holding force holding member
C ring or a partially cut annular ring whose ends are staggered with each other or an O-ring
Removable medical cutting tool.

The method of claim 3,
Wherein when the coupling force holding member is formed of a C ring or a cut ring, the C ring or the cut annular ring is configured to have an outer diameter larger than the diameter of the coupling groove,
Removable medical cutting tool.

The method of claim 3,
Wherein when the coupling force holding member is formed of a C ring or a cut ring, the C ring or the cut annular ring has an inner diameter smaller than the diameter of the coupling projection,
Removable medical cutting tool.

6. The method according to any one of claims 2 to 5,
Wherein the engaging projection is tapered so as to become narrower toward the end, the engaging groove is tapered to correspond to the engaging projection,
The seating groove is formed in the inner surface of the engaging groove
Removable medical cutting tool.

The method of claim 6,
Wherein the coupling force holding member is formed of a C ring or a cut annular ring whose ends are mutually staggered,
The C-ring or the cut annular ring or the O-ring has a rounded cross-sectional shape in two stages
Removable medical cutting tool.

The method of claim 7,
The C-ring or the cut annular ring or the O-ring is eccentrically formed so that an elastic force acts on one side in the plane
Removable medical cutting tool.

The method of claim 2,
Wherein the coupling force holding member comprises an annular plate spring
Removable medical cutting tool.

The method according to any one of claims 3 to 5,
When the C-ring or the cut annular ring is provided on the engaging projection, a tooth-shaped concave-convex portion is formed on the inner diameter of the C-ring or the cut annular ring,
And a serration-like concave-convex portion is formed on the seating surface of the engaging projection to which the C ring or the cut annular ring is engaged
Removable medical cutting tool.

The method of claim 2,
Wherein one of the connecting portion of the shank portion in which the coupling groove is formed and the engaging portion of the cutting edge portion is formed by cutting at least two,
The coupling groove may have a cross-sectional shape that is linearly formed or inclined
Removable medical cutting tool.

The method of claim 2,
Further comprising fixing means for fixing the connecting portion and the engaging portion,
Wherein the fixing means includes at least one fixing hole penetrating in a direction orthogonal to the coupling groove and having a threaded portion formed on an inner surface thereof and a coupling member screwed through the fixing hole
Removable medical cutting tool.

The method according to claim 1,
The anti-
And an end portion of the connecting portion and an end portion of the engaging portion are formed in an elliptical shape or a partially cut circular or polygonal shape or a cross-
Removable medical cutting tool.