JP2009285358A - Guide member for medical cutting tool, and medical cutting tool to be inserted to the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a guide member for a medical cutting tool for easily setting the cutting tool and performing a stable puncturing action, and to provide the medical cutting tool to be inserted to the guide member. <P>SOLUTION: The guide member 1 includes: a body portion 10 to be fitted to the tooth row of a patient; a guide portion 11 for guiding the cutting tool in a cutting direction, which performs a puncturing work to mount an implant; and a slit groove 12 which is opened by notching the side of the guide portion 11. The guide portion 11 has an inner diameter same as or a little larger than the outer diameter of the cutting member 22. The width of the slit groove 12 is set to be smaller than the inner diameter of the guide portion 11 and larger than the width of an inserting portion 28 which is formed with a thin width by notching a part of the outer peripheral surface of the cutting member 22. The inserting portion 28 is inserted to the slit groove 22, thereby the cutting member 22 is inserted to the guide portion 11 from a lateral direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a guide member for a medical cutting tool used in drilling an insertion hole for an implant in a bone in a surgical operation such as dentistry, oral surgery, and orthopedic surgery.

  In surgical operations such as dentistry, oral surgery, and orthopedic surgery, it is necessary to accurately insert implants such as artificial roots, artificial joints, artificial bones, and fracture treatment tools. A hole is formed, and the implant is inserted into the insertion hole to be positioned and fixed.

  As a medical cutting tool used for such drilling, for example, in Patent Document 1, a tubular saw and a drill are provided coaxially, and a bone-shaped tissue is drilled by the tubular saw and the resulting bone fragments are collected inside by a drill. Tools.

When drilling with a cutting tool, it is necessary to set the cutting direction in advance, and a guide member for that purpose is used. For example, Patent Document 2 includes a coronal member that is attached to a missing part of a human body part, and the coronal member is provided with a guide hole penetrating in the vertical direction to guide the working device to a target drilling position. The guide member which has the slit of the up-down direction opened toward the side from is described. Moreover, in patent document 3, the implant planting guide in which the guide groove was formed is described in FIG.
JP-A-6-304187 Japanese Patent No. 2006-341067 JP 2008-73440 A

  In the guide members as described in Patent Documents 2 and 3, a groove formed in a slit shape in the vertical direction is used to guide the cutting tool. When such a groove is used as a guide surface, the cutting tool is used. Although it can be easily positioned by inserting from the side, there is a demerit that the cutting tool easily swings in the groove during the drilling operation and a stable drilling operation cannot be performed.

  Then, this invention aims at providing the guide member of the medical cutting tool which can set a cutting tool easily, and can perform the stable drilling operation, and the medical cutting tool which can be inserted in it. To do.

  The guide member of the medical cutting tool according to the present invention is a guide member for a medical cutting tool that is provided with a cutting portion on the distal end side and rotates around a central axis, and can be attached to a treatment site. And a guide surface having an inner diameter that is the same as or slightly larger than the outer diameter of the outer peripheral surface of the medical cutting tool is formed so as to penetrate the main body portion in the vertical direction and the medical device in the cutting direction. A guide portion that guides the cutting tool, and a slit groove portion that is formed by cutting the guide portion in a vertical direction and having a width narrower than an inner diameter of the guide portion, and the width of the slit groove portion is the medical cutting It is set to be narrower than the outer diameter of the outer peripheral surface of the tool and wider than the width of the insertion portion formed by narrowing a part of the outer peripheral surface, and inserting the insertion portion into the slit groove portion. Front to the guide Characterized by inserting the medical cutting tool from the side. Furthermore, the guide part is formed by fixing a cylindrical member having a slit corresponding to the slit groove part to the main body part.

  The medical cutting tool according to the present invention is a medical cutting tool that can be inserted into the guide portion of the guide member, and has an outer diameter that is substantially equal to an inner diameter of the guide surface in at least a partial region of the outer peripheral surface. It is characterized by having an insertion portion that is set to be the same or slightly smaller and is formed in a narrow width by cutting out a part of the outer peripheral surface in the region.

  By having the configuration as described above, the width of the slit groove portion is narrower than the outer diameter of the outer peripheral surface of the medical cutting tool, and a part of the outer peripheral surface is cut out to be narrower than the width of the insertion portion formed. Since it is set widely, the medical cutting tool can be easily inserted into the guide portion, and at the same time, when the medical cutting tool is rotated to perform the drilling operation, the medical cutting tool can be stably operated.

  That is, when inserting the medical cutting tool into the guide portion, if the insertion portion of the medical cutting tool is inserted in the lateral direction corresponding to the slit groove portion, the width of the slit groove portion is set wider than the width of the insertion portion. Therefore, the insertion portion can be easily passed through the slit groove portion, and the medical cutting tool can be easily attached to the guide portion.

  In addition, when the medical cutting tool is rotated while being inserted into the guide portion, the width of the slit groove is set to be narrower than the outer diameter of the outer peripheral surface of the medical cutting tool. The tool is reliably prevented from jumping out of the guide portion into the slit groove portion. Therefore, the medical cutting tool rotates in a stable state within the guide portion, and the medical cutting tool can be accurately guided in a preset cutting direction.

  In addition, a cylindrical member having a slit corresponding to the slit groove portion is used as a guide portion, which is fixed to the main body portion, so that the cylindrical member can be rotated using a highly wear-resistant material that is slippery with respect to the rotation operation. The operation can be performed smoothly. Then, if the cylindrical member is accurately molded in advance and fixed to the main body, the accuracy of the inner peripheral surface of the guide can be increased, and the cutting direction of the medical cutting tool can be set with high accuracy. It becomes.

  In addition, when a guide member is manufactured, if a guide member is formed by fixing a previously formed cylindrical member, a guide member with higher accuracy than that in the case of forming the guide portion by directly processing the main body portion is provided. It can be manufactured easily.

  Hereinafter, embodiments according to the present invention will be described in detail. The embodiments described below are preferable specific examples for carrying out the present invention, and thus various technical limitations are made. However, the present invention is particularly limited in the following description. Unless otherwise specified, the present invention is not limited to these forms.

  FIG. 1 is an external perspective view of an embodiment according to the present invention. The guide member 1 is used for dental treatment, and includes a main body portion 10 to be mounted on a patient's dentition, a guide portion 11 for guiding a cutting tool for performing a drilling operation for mounting an implant in a cutting direction, and a guide portion 11. The slit groove part 12 opened by notching a side is provided.

  The main body 10 is formed using a known resin material. Examples of the resin material include vinyl chloride resin, vinyl acetate resin, polyester resin, ABS resin, acrylic resin, fluororesin, polyamide resin, acetal resin, and polycarbonate. In view of convenience when performing an implant operation, the resin material is preferably transparent or translucent.

  The main body 10 is molded by closely adhering a molten resin material to a dental mold such as gypsum formed by shaping a patient's dentition. Therefore, the lower surface of the main body 10 can be formed into a shape that is in close contact with the tooth mold. In addition, it can also be set as the shape closely_contact | adhered by pressing a plate-shaped resin material to the tooth type | mold from the upper side in the softened state.

  The guide portion 11 is formed by a cylindrical member 110 as shown in FIG. 2 being embedded and fixed in the main body portion 10. The cylindrical member 110 penetrates the main body portion 10 in the vertical direction, and the inner peripheral surface serves as a guide surface that guides the cutting tool in the cutting direction. The cylindrical member 110 is formed with a slit 111 that is cut out in a vertical direction with a predetermined width.

  FIG. 3 is a top view of the guide portion 11. The width d of the slit 111 is set to be narrower than the inner diameter D of the inner peripheral surface of the cylindrical member 110. Further, the inner diameter D of the cylindrical member 110 is set to be substantially the same as or slightly larger than the outer diameter of the outer peripheral surface of the cutting tool to be inserted into the guide portion 11, and the inserted cutting tool is the guide portion. Thus, the rotation operation can be performed stably without shaking. Since the width d of the slit 111 is narrower than the inner diameter D, the cutting tool that is rotating is not shifted to the slit 111.

  As will be described later, the cylindrical member 110 is mounted in advance on a metal rod set in an implantation hole for an implant drilled in a tooth mold, and the main body portion 10 is placed in a state where the metal rod is set in the tooth mold. By covering and solidifying the tooth mold with the resin material to be formed, it is possible to accurately position along the cutting direction for embedding the implant.

  The material used for the cylindrical member 110 is preferably a resin material or a metal material having high strength, wear resistance, and excellent sliding characteristics. Further, the cutting tool is scraped off during the rotation operation in the guide portion 11 to the outside. It is desirable to select one that is harmless to the human body in consideration of scattering. For example, polyacetal is preferable as the resin material, and titanium is preferable as the metal material.

  The slit groove portion 12 is formed by cutting the main body portion 10 into a groove shape so as to extend laterally from the slit 111 of the cylindrical member 110. As shown in FIG. 3, the groove width of the slit groove portion 12 is set to be the same as or wider than the width of the slit 111, and if the groove width is formed widen, the cutting tool can be easily inserted. .

  4 is a perspective view of the cutting tool 20 to be inserted into the guide member 1, and FIG. 5 is a front view (FIG. 5 (a)) and a side view (FIG. 5 (b)) of the cutting tool. The cutting tool 20 includes a support member 21 and a cutting member 22. The support member 21 is formed in a rod shape, and an engaging portion 23 for attaching to a handpiece (not shown) is formed at the upper end portion. The cutting member 22 is formed in a cylindrical shape, and a saw-like cutting portion 24 is formed at the lower end portion.

  A scale 25 including a plurality of lines is displayed on the outer peripheral surface of the cutting member 22, and the depth of drilling of the cutting member 22 can be confirmed by the scale 25. Further, between the lines of the scale 25, a pair of rectangular openings 26 are formed at positions that are symmetrical with respect to the central axis. On the lower end side of the opening 26, another pair of openings 27 is formed in the same manner as the opening 26. By forming these openings 26 and 27, it is possible to take out the cut material accumulated in the cutting member 22 during the drilling operation of the cutting part 20.

  An insertion portion 28 is formed between the opening 27 and the cutting portion 24. The insertion portion 28 is set to have a width d 'narrower than the outer diameter D' of the outer peripheral surface of the cutting member 22 by notching at positions of the same width on both sides from the central axis. The outer diameter D ′ of the cutting member 22 is set to be substantially the same as or slightly smaller than the inner diameter D of the cylindrical member 110, and the width d ′ of the insertion portion 28 is the width of the slit 111 of the cylindrical member 110. It is set to be slightly smaller than d. Further, the length of the insertion portion 28 is set slightly longer than the length of the cylindrical member 110.

  6-10 is explanatory drawing regarding the manufacturing process of the guide member 1. FIG. FIG. 6 is a perspective view of a patient's tooth pattern, and a tooth row 51 is formed on an upper portion of a U-shaped base 50. And the embedding hole 52 is previously drilled in the site | part which embeds an implant. The embedding hole 52 is formed along an embedding direction determined based on an X-ray image obtained by imaging a treatment site of a patient.

  In FIG. 7, a metal rod 60 having the same diameter as that of the cutting member 22 of the cutting tool is inserted into the embedded hole 52 formed in the patient's tooth mold. A cylindrical member 110 is fitted and attached to the metal rod 60. The attachment position of the cylindrical member 110 is set to a predetermined height so that the cutting portion 24 does not contact the gingiva when the cutting tool is inserted into the cylindrical member 110.

  In FIG. 8, the entire tooth row is closely attached with a molten resin material in a state where the metal rod 60 is inserted. At that time, the cylindrical member 110 attached to the metal rod 60 is closely attached so as to be filled with a resin material, and the portion corresponding to the slit 111 is formed in a notched state. Thus, the resin material is solidified to mold the main body 10 of the guide member 1.

  In FIG. 9, by removing the solidified main body 10 from the tooth mold and pulling out the metal rod 60 from the cylindrical member 110, the guide member 1 on which the guide portion 11 is formed can be molded. Since the cylindrical member 110 is fixed while being fitted to the metal rod 60, the inner peripheral surface of the cylindrical member 110 is set so as to guide in the cutting direction which is the implant embedding direction. A slit-like groove 70 is formed in a portion corresponding to the slit 111 of the guide portion 11.

  In FIG. 10, the resin material below is cut off from the lower surface of the cylindrical member 110, and the groove 70 is also cut away from the slit 111 to finish the guide portion 11 and the slit groove portion 12.

  By manufacturing as described above, the guide member 1 can be formed by accurately positioning the previously formed cylindrical member 110 in the cutting direction of the cutting tool, which is the implant embedding direction. In addition, since the lower surface of the main body 10 is formed into a shape that matches the patient's tooth shape, the guide member 1 can be attached in close contact with the patient's teeth during the operation, and the cutting tool is rotating. The drilling operation can be performed in a stable state without shaking.

  In the above manufacturing process, the molten resin material is solidified and fixed together with the cylindrical member. However, after the molten resin material is solidified according to the tooth mold and the main body portion is formed, the cylindrical member is The fixed part may be deleted, and the metal rod fitted with the cylindrical member may be positioned in the deleted part and bonded to the main body part by a molten resin material. Even when the main body is molded using a plate-shaped resin material, the cylindrical member may be bonded and fixed by deleting the portion for fixing the cylindrical member.

  FIG. 11 to FIG. 13 are explanatory views showing a process when the cutting tool 20 is inserted into the guide member 1. As shown in FIG. 11, the guide member 1 is attached to the patient's dentition to accurately position the guide portion 11 at the implant site. After setting the guide member 1, as shown in FIG. 12, the handpiece H to which the cutting tool 20 is attached is introduced along the slit groove portion 12 from the lateral direction of the guide portion 11. At that time, the insertion portion 28 formed on the cutting member 22 of the cutting tool 20 is inserted to face the slit groove portion 12. FIG. 14A is a cross-sectional view showing a state where the insertion portion 28 is inserted into the cylindrical member 110 of the guide portion 11. Since the width of the insertion portion 28 is slightly smaller than the width of the slit 11, the cutting tool 20 can be inserted into the cylindrical member 110 only from the insertion portion 28.

  If the cutting tool 20 is rotated after the insertion portion 28 is mounted on the cylindrical member 110, the insertion portion 28 is displaced from the slit 111, so that the cutting tool 20 is stabilized in the cylindrical member 110 without coming out of the slit 111. Held in a state.

  When the cutting tool 20 is held in the cylindrical member 110, the cutting tool 20 is guided in the cutting direction. Then, as shown in FIG. 13, when the cutting tool 20 is rotationally driven, the cutting portion 24 bites into the gingiva M and operates to drill a circular hole. The depth by the drilling operation can be accurately drilled to a predetermined depth by checking the scale displayed on the cutting member 22.

  FIG. 14A is a cross-sectional view showing a state in which the insertion portion 28 of the cutting member 22 rotates in the cylindrical member 110 of the guide portion 11. Since the cutting member 22 rotates at a high speed in the cylindrical member 110, the insertion portion 28 is hardly detached from the slit 111. Since the length of the insertion portion 28 is set slightly longer than the length of the cylindrical member 110, when the cutting member 22 moves downward by the drilling operation, the insertion portion 28 is moved away from the cylindrical member 110. The cutting member 22 is displaced in the axial direction, and a stable rotation operation can be performed without the cutting member 22 being detached from the cylindrical member 110.

  Therefore, the drilling operation can be performed without the cutting member 22 being shaken, and the embedding hole for the implant can be formed as designed.

  The guide member of the medical cutting tool according to the present invention can be suitably used for drilling an implantation hole for an implant in a bone in a surgical operation such as dentistry, oral surgery, and orthopedic surgery.

It is an external appearance perspective view regarding embodiment which concerns on this invention. It is a perspective view regarding a cylindrical member. It is a top view regarding a guide part. It is a perspective view regarding a cutting tool. It is the front view and side view regarding a cutting tool. It is explanatory drawing regarding the manufacturing process of a guide member. It is explanatory drawing regarding the manufacturing process of a guide member. It is explanatory drawing regarding the manufacturing process of a guide member. It is explanatory drawing regarding the manufacturing process of a guide member. It is explanatory drawing regarding the manufacturing process of a guide member. It is explanatory drawing regarding the process of inserting a cutting tool in a guide member. It is explanatory drawing regarding the process of inserting a cutting tool in a guide member. It is explanatory drawing regarding the process of inserting a cutting tool in a guide member. It is sectional drawing regarding the state by which the insertion part was inserted in the cylindrical member.

Explanation of symbols

1 Guide member
10 Main unit
11 Guide section
12 Slit groove
110 Cylindrical member
111 slits
20 Cutting tool
21 Support member
22 Cutting material
24 Cutting part
28 Insertion section

Claims (3)

  A medical cutting tool guide member that is provided with a cutting portion on the distal end side and rotates around a central axis to perform a cutting operation, and a main body portion that can be attached to a treatment site, and the medical cutting tool A guide surface having an inner diameter that is the same as or slightly larger than the outer diameter of the outer peripheral surface of the outer peripheral surface is formed through the main body portion in the vertical direction and guides the medical cutting tool in the cutting direction, and the guide portion And a slit groove formed in a width narrower than the inner diameter of the guide portion, and the width of the slit groove portion is narrower than the outer diameter of the outer peripheral surface of the medical cutting tool. The medical cutting tool is set to be wider than the width of the insertion portion formed by cutting out a part of the guide portion and the insertion portion is inserted into the slit groove portion. To insert from the direction Medical cutting tool guide members to symptoms.   The guide member according to claim 1, wherein the guide portion is formed by fixing a cylindrical member having a slit corresponding to the slit groove portion to the main body portion.   It is a medical cutting tool which can be inserted in the guide part of the guide member of Claim 1 or 2, Comprising: An outer diameter is substantially the same as the inner diameter of the said guide surface in at least one part area | region of an outer peripheral surface, or slightly. A medical cutting tool characterized by having an insertion portion that is set to be small and is formed by narrowing a part of the outer peripheral surface in the region.

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