JP2008295901A - Instrument for collecting excised bone - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an instrument for collecting excised bone which credibly and intactly collects a bone excised using a tubular bone cutter having sawteeth on a distal part without crushing the excised bone. <P>SOLUTION: The excised bone collecting instrument has a support member 1 and a guide member 2. A screw fixing part 10 is formed on one side of a flange part 13 located in the middle of the support member 1 via a screwing part 12 having a screw thread in its outer circumference. The guide member 2 has a cylindrical main unit 20. An attaching part 21 having a screw groove in its inner circumference is formed on one end of the main unit 20 and an open part 22 is formed on the other end. By attaching the attaching part 21 to the screwing part 12, the guide member 2 is attached to the support member 1. A bone is collected intactly by inserting and rotating the open part 22 of the guide member 2 into and within a cut mark made by a bone cutter, screwing the screw fixing part 10 to the inside of the bone, and pulling the instrument. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a resected bone collecting 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 such a punch, for example, a cutting tool in which a cutting blade is formed in a cylindrical opening as described in Patent Document 1 is used. In the cutting tool described in Patent Document 1, it is possible to accurately drill a cylindrical hole, but it is necessary to remove the cut internal bone, and therefore, for example, described in Patent Documents 2 and 3 As described above, it has been proposed to crush and remove the internal bone at the same time as the cutting of the bone, take out the crushed bone together with the device, and reuse it as a filling material for the hole when the implant is attached.

As a method for removing the cut bone, for example, in Patent Document 4, a bone plug cut with a cylindrical blade is inserted into a rod-shaped body, and is compressed with a screw, and the rod-shaped body is twisted and removed. The point which was made is described.
Japanese Utility Model Publication No. 56-28308 Japanese Patent Laid-Open No. 10-118085 Special table 2003-526417 Japanese Utility Model Publication No. 1-82015

  When the cut bone is crushed and removed as in Patent Document 2, the crushed bone is reused. When the internal bone is crushed at the same time as the cutting, the crushed bone is one when taken out. The reusable living bone may be wasted. In addition, as in Patent Document 4, in the case of pinching with a screw and twisting, the bone plug portion is not pinched and may be cut off in the middle of the bone plug and cannot be removed cleanly from the bottom surface.

  Therefore, an object of the present invention is to provide a resected bone collecting tool that can reliably collect the whole bone as it is without crushing the bone to be resected using a tubular bone cutting tool having a sawtooth formed at the tip. Is.

  A resected bone collecting tool according to the present invention is a resected bone collecting tool for collecting bone to be resected using a tubular bone cutting tool, and has a shape that can be inserted into a cutting mark of the bone cutting tool. And a support member that supports the guide member so as to be detachable in the central axis direction and is provided with a rod-like screw fixing portion that extends along the central axis inside the guide member. It is characterized by that. Furthermore, the guide member is screwed to the support member. Further, the screw fixing portion is set such that a tip thereof is inward of an opening end of the guide member. Further, the screw fixing portion is formed in a tapered shape so that the tip thereof has a sharp shape.

  By having the configuration as described above, a tubular guide member having a shape that can be inserted into a cutting mark of a bone cutting tool, and a guide member that is detachably supported in the central axis direction, and that is centered inside the guide member. And a support member provided with a rod-shaped screw fixing portion extending along the guide, and using a tubular bone cutting tool having a serrated tip at the tip, guides to a cutting mark formed on the living bone. When the support member is rotated while the member is inserted, the internal screw fixing part is screwed into the living bone, and if the support member is pulled out with the screw fixing part screwed in, the entire bone of the excised part is removed. It can be collected as it is. Then, since the screw fixing portion is screwed in while inserting the guide member into the cutting mark, the screw fixing portion is surely screwed into the bone of the excised portion without detaching from the bone of the excised portion, and the support member is Since the bone is separated and collected at the distal end portion of the screw fixing portion when being pulled out, the bone can be reliably collected without leaving the entire bone of the excised portion.

  Therefore, the insertion hole of the implant formed in the bone after the bone is collected can be finished finely to the depth at the time of cutting. Further, the extracted bone is removed from the support member along the central axis direction so that the entire bone of the excised part into which the screw fixing part is screwed is exposed, and the screw fixing part is extracted from the bone of the excised part. If it is removed, the bone of the excised part can be easily obtained without flowing out to the outside as in the case of being crushed. In addition, since the bones collected in this way are collected in the state of living bones without being crushed, the bone surface and internal tissues can be obtained as they are, and divided according to the bone parts. It can also be processed.

  In addition, if the guide member is screwed onto the support member, the guide member can be easily attached and detached in the direction of the central axis, and the guide member can be detached when operated while rotating the support member. And stable operation.

  Also, if the tip of the screw fixing portion is set to be inward of the opening end of the guide member, the tip of the screw fixing portion is boned with the opening end of the guide member inserted into the cutting mark of the bone cutting tool. The support member can be rotated in a state where the screwing position and direction of the distal end of the screw fixing portion are reliably set by inserting the guide member, and the stable state without being detached from the bone of the excised portion Thus, the screw fixing portion can be screwed.

  In addition, if the screw fixing part is tapered so that the tip of the screw fixing part has a sharp shape, the screw fixing part can be smoothly screwed into the bone, and the bone can be broken even when the screw fixing part is removed from the bone. And can be easily removed.

  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 exploded perspective view of an embodiment according to the present invention. The excised bone collection tool includes a support member 1 and a guide member 2.

  The support member 1 is a rod-like body having a flange portion 13 formed substantially at the center. The flange portion 13 protrudes in a disc shape, and a pair of planar locking portions 13a are cut out from a part of the outer peripheral surface. Is formed. A screw fixing portion 10 is formed on one side from the flange portion 13 via a screwed portion 12 having a thread formed on the outer periphery.

  The screw fixing portion 10 extends in a rod shape along the central axis of the support member 1, and a helical thread is formed on the entire outer peripheral surface. And the whole shape of the screw fixing | fixed part 10 is formed in the taper shape so that it may become a sharp shape as it goes to a front-end | tip part.

  On the other side of the flange portion 13, an attachment portion 11 that is attached to a drive head (not shown) is formed. The mounting portion 11 is formed in a columnar shape along the central axis of the support member 1, and a mounting portion 11 a that is mounted and fixed to the drive head is provided at the tip portion thereof.

  The support member 1 is made of a metal material such as stainless steel, and the entire shape thereof is integrally formed by cutting or the like.

  The guide member 2 includes a main body portion 20 formed in a cylindrical shape, and an attachment portion 21 having a thread groove formed on an inner peripheral surface is provided at one end portion of the main body portion 20, and the other end portion is provided. The part is provided with an opening 22. You may make it display the scale which shows the inserted depth on the outer peripheral surface of the main-body part 20. As shown in FIG.

  The guide member 2 is detachably attached to the support member 1 by fitting the attachment portion 21 into the screwed portion 12 of the support member 1 and screwing it in. Moreover, a part of outer peripheral surface of the attaching part 21 is notched, and a pair of planar locking parts 21a is formed. When the guide member 2 is fastened and fixed to the support member 1 or removed from the support member 1, the locking portion 21 a is fitted with an attachment tool (not shown) together with the locking portion 13 a formed on the flange portion 13. Thus, the guide member 2 can be easily attached to and detached from the support member 1 by rotating them reversely.

  The opening 22 of the guide member 2 has an outer peripheral surface that is tapered inward so that it can be easily inserted into a cutting mark as will be described later.

  The guide member 2 is made of a metal material such as stainless steel like the support member 1, and the entire shape thereof is integrally formed by cutting or the like.

  When the guide member 2 is attached to the support member 1, the support member 1 is also inserted when the attachment portion 21 is fastened and fixed to the screwing portion 12 by being inserted in the center axis direction from the tip of the screw fixing portion 10. It moves in the direction of the central axis of and is removed.

  FIG. 2 is a cross-sectional view taken along the central axis of the support member 1 with the guide member 2 attached to the support member 1. The central axis of the screw fixing portion 10 of the support member 1 coincides with the central axis of the main body portion 20 of the guide member 2, and when the attachment portion 11 is attached to the drive head and driven to rotate, the rotation axis A is The screw fixing part 10 and the main body part 20 come to rotate around the center. As shown in the partially enlarged cross-sectional view of FIG. 3, the pointed tip 10 a of the screw fixing portion 10 and the center of the opening 22 are located on the rotation axis A, and the tip 10 a is slightly smaller than the opening 22. It is set to be positioned inward.

  In addition, the shape such as the outer diameter of the screw fixing portion 10 and the shape such as the outer diameter of the main body portion 20 are prepared according to the type of the bone cutting tool for drilling the insertion hole for the implant, What is necessary is just to select a corresponding thing.

  FIG. 4 is a perspective view showing a case where the support member 1 is attached to the drive head 100. The attachment portion 11 of the support member 1 can be easily attached by being inserted into the attachment portion 101 of the drive head 100. And the operation | movement for an implant is performed by hold | gripping and operating the drive head 100 by hand.

  FIG. 5 is a perspective view of the bone cutting tool 3. The bone cutting tool 3 is provided with a mounting portion 31 on one side of a cylindrical main body portion 30 and a cutting portion 32 in which a sawtooth is formed on the tip portion on the other side. Then, similarly to the above-described excised bone collecting tool, a circular cutting mark can be formed on the bone by attaching the attachment portion 31 to the drive head and rotationally driving it. Such bone cutting tools are known.

  FIG. 6 is an explanatory view showing a cutting process by the bone cutting tool 3. When the bone cutting tool 3 is rotated, the main body 30 is rotated about the central axis thereof, and the circular cutting portion 32 is similarly rotated about the center thereof (FIG. 6). (A)). Then, the cutting is performed by pressing the cutting portion against the target site of the bone B while rotating the cutting portion 32 (FIG. 6B). A scale indicating the cutting depth is displayed on the outer peripheral surface of the main body 30, and the main body 30 is pushed in while rotating to the required depth while checking the scale. When the bone cutting tool 3 is pulled up after being cut to a required depth, a circular cutting mark C is formed, and the bone B1 at the excised portion remains in a cylindrical shape (FIG. 6C).

  FIG. 7 is an explanatory diagram showing a process of collecting the remaining excised bone B1 with the excised bone collecting tool. First, the opening 22 of the guide member 2 of the excised bone sampling tool is inserted into the cut mark C and aligned, and at that time, the tip 10a of the internal screw fixing portion 10 is centered on the circular surface of the bone B1 of the cut portion. It is positioned so as to pierce (FIG. 7A).

  After the alignment, the excised bone collecting tool is rotationally driven, so that the screw fixing portion 10 is screwed so as to be screwed into the bone B1 of the excised portion. At that time, since the main body portion 20 of the guide member 2 is guided along the outer periphery of the bone B1 of the excision portion, the screw fixing portion 10 is screwed in without shifting from the central axis of the bone B1 of the excision portion. (FIG. 7B). When the screw fixing portion 10 is screwed, the bone portion is pressed toward the inner peripheral surface of the guide member 2, and the bone B <b> 1 of the excised portion is pressed and held in the guide member 2. .

  While confirming the scale displayed on the outer peripheral surface of the guide member 2, the guide member 2 is inserted to a necessary depth, and then the excised bone collecting tool is pulled out so that the bone B1 of the excised portion is separated. . At this time, since the tip 10a of the screw fixing portion 10 is screwed to the bottom of the bone B1 at the excised portion, it can be separated so as to remove the entire bone B1 at the excised portion. Therefore, the holes formed after the separation can be finished to the designed dimensions with no residue on the bottom surface, and the implant can be inserted smoothly (FIG. 7C).

  The excised bone collecting tool that separates and holds the bone B1 of the excised portion is removed from the drive head, and the guide member 2 is rotated by an attachment tool to be removed from the screwed portion 12 of the support member 1. Then, by moving the main body portion 20 in the central axis direction, the guide member 2 can be removed while holding the bone B1 at the excised portion on the screw fixing portion 10 (FIG. 7D).

  After removing the guide member 2, the screw fixing portion 10 is removed from the bone while rotating the support member 1 while holding the bone B1 at the excised portion (FIG. 7E). Thus, the bone B1 at the excised portion can be collected as it is in the living bone without flowing out (FIG. 7 (f)). The collected bone may be crushed and used as a filling material for the implant insertion hole. At that time, the particle size of the crushed can be freely set, and can be finely adapted to the condition of the implant. . Moreover, since it can extract | collect from a living bone as it is, it can also be easily performed by isolate | separating and using the extract | collected bone for every site | part.

  As described above, the cut bone can be easily removed in a short time and collected as it is, so that the collected bone can be effectively used widely in various implant procedures.

It is a disassembled perspective view regarding embodiment which concerns on this invention. It is sectional drawing regarding embodiment shown in FIG. It is a partially expanded sectional view of FIG. It is a perspective view which shows the mounting state to a drive head. It is a perspective view regarding a bone cutting tool. It is explanatory drawing which shows the cutting process by a bone cutting tool. It is explanatory drawing which shows the collection process by a resected bone collection tool.

Explanation of symbols

1 Support member
10 Screw fixing part
11 Mounting part
12 Screwed part
13 Flange part 2 Guide member
20 Main unit
21 Mounting part
22 opening

Claims (4)

  An excised bone collecting tool for collecting bone to be excised using a tubular bone cutting tool, the tubular guide member having a shape that can be inserted into a cutting mark of the bone cutting tool, and the guide member as a center A resecting bone collecting tool comprising: a supporting member that is detachably supported in an axial direction and provided with a rod-like screw fixing portion that extends along a central axis inside the guide member.   The excised bone collecting tool according to claim 1, wherein the guide member is screwed to the support member.   The excised bone collecting tool according to claim 1 or 2, wherein the screw fixing portion is set so that a tip thereof is inward of an opening end of the guide member.   The excised bone sampling tool according to any one of claims 1 to 3, wherein the screw fixing portion is formed in a tapered shape so that a tip thereof has a sharp shape.

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