KR20100021954A - Medical cutting tool, its guide member, and cut bone sampling tool - Google Patents

Abstract

Intended is to provide a medical cutting tool, which can recover chips produced by the cutting action, thereby to form a hole for inserting an implant stably therethrough. The medical cutting tool comprises a supporting member (1) and a cutting member (2). This cutting member (2) has a cutting portion (21) formed at one end portion of a cylindrical body portion (20), and the cutting portion (21) has cutting edges (23) extended radially from the center axis of the body portion (20) toward the outer circumference. A center tip portion (24) is formed at the central portion, in which the cutting edges (23) are formed, and outer circumference tip portions (25) are formed at the outer circumference end portion. Between the cutting edges (23), inclined side faces (23b) and side faces (23a) of the adjoining cutting edges (23) are formed to intersect in valley shapes, in which inlet portions (26) are so individually formed in the valley-shaped portions as to communicate with the inside of the body portion (20).

Description

MEDICAL CUTTING TOOL, ITS GUIDE MEMBER, AND CUT BONE SAMPLING TOOL

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a medical cutting tool used for drilling an implant insertion hole in a bone, a guide member thereof, and an excision bone in a surgical operation such as dentistry, oral surgery, orthopedic surgery.

In surgical operations such as dentistry, oral surgery, and orthopedic surgery, it is necessary to accurately insert and insert implants such as artificial roots, artificial joints, artificial bones, and fracture treatment tools. And positioning the implant by inserting the implant into the insertion hole.

As a medical cutting tool used for such a drilling, for example, Patent Document 1 discloses a cutting path through which a cutting chip generated by a cutting operation in the axial direction penetrates, and a cutting edge having a forward angle in the rotational direction at a constant angle is fixed. DESCRIPTION OF RELATED ART There is described a medical hollow drill in which a plurality of radially formed at intervals is formed and an induction surface of the cutting chip is formed in the discharge path direction from the outermost circumference of the cutting edge. In addition, Patent Literature 2 discloses a first drill, which is a forming drill having a function of making an accurate cylindrical flat bottom and leaving a cortical bone at the bottom of the maxillary sinus, and an incision having a function of separating disc-like cortical bone in a state where the maxillary sinus mucosa is attached to the cavity bottom. A drill apparatus using a combination of a second drill, which is a drill, and a third drill, which is a coarse drill having a function of pushing up the maxillary sinus mucosa with the disc-like cortical bone in contact with the discoid cortical bone, is described. In addition, Patent Document 3 describes a drill for drilling consisting of a leading edge portion and a trailing edge portion of two or four spiral blades.

As a drilling tool, when the cutting tool in which the cutting blade was formed in the opening part of a cylinder is used as described, for example, in patent document 4, although a cylindrical hole can be drilled correctly, it is necessary to remove the internal bone which cut | disconnected. For that purpose, for example, as described in Patent Documents 5 and 6, the internal bones are crushed and removed at the same time as the bones are cut, and the crushed bones are taken out together with the device to remove the hole at the time of installation of the implant. It is proposed to reuse for a filling material.

As a method of removing the cut bone, for example, in Patent Document 7, a bone plug cut into a cylindrical blade is inserted into the rod-shaped body, tightened by a screw, and the rod-shaped body is twisted and removed. One point is described.

When drilling is performed by the cutting tool, the cutting direction needs to be set in advance, and a guide member therefor is used. For example, in patent document 8, the tubular member is provided with a tubular member which covers the defect part of a human body part, and is provided, The tubular member is provided with the guide hole which penetrates up and down in order to guide a work device to a target punching position, The guide member which has the slit of the up-down direction opened toward the side from the guide hole is described. Moreover, in patent document 9, the implant implantation guide in which the guide groove was formed is described in FIG.

Patent Document 1: Japanese Utility Model Publication H5-542810

Patent Document 2: Japanese Patent No. 3706938

Patent Document 3: Japanese Patent Application Laid-open No. Hei 6-304187

Patent Document 4: Japanese Utility Model Publication No. 56-28308

Patent Document 5: Japanese Patent Application Laid-open No. Hei 10-118085

Patent Document 6: Japanese Patent Application Publication No. 2003-526417

Patent Document 7: Japanese Utility Model Publication No. Hei 1-82015

Patent Document 8: Japanese Patent No. 2006-341067

Patent Document 9: Japanese Patent Application Publication No. 2008-73440

In the case of drills described in Patent Literature 2 and Patent Literature 3, it is difficult to reuse such a crushed material because the crushed material of a living body bone generated by cutting is removed. It is also conceivable to recover the crushed matter which has leaked out when cutting, but it is not preferable because impurities may be mixed when spilled.

In Patent Literature 1, the cutting chips generated by cutting are guided into the discharge path as they are and sucked, so that the cutting chips are not scattered to the surroundings, but the cutting operation is performed with the forwardmost part in the rotational direction as the forward angle. Therefore, the position is easy to shake, and it is difficult to cut efficiently. In addition, the bottom portion of the drilled hole is shaped to have a raised center, and the implant to be inserted and inserted is likely to become unstable.

It is preferable that the shape of the bottom of the drilled hole is as close as possible to the shape of the implant. However, in the case of the drill shape described in Patent Literature 1, since the peripheral portion of the bottom is deepened, the depth of the periphery is deeper than that to insert the implant to a predetermined depth. The part must be cut to cut the living bone unnecessarily. Therefore, the damage to the living bone is increased by that amount and the regeneration of the bone is delayed. Also in the case of the drill shape of patent document 3, since the center part is cut deeply, there exists a problem of unnecessarily cutting a living bone similarly.

In addition, as in Patent Literature 5, when crushing and removing the cut bones, the crushed bones are reused. However, when the bones inside are crushed at the same time as the cuts, the crushed bones sometimes leak out during extraction. And reusable living bones may become obsolete. In addition, when it is tightened with a screw and twisted off like a patent document 7, since it is not tightened in a bone front part, it cuts off in the middle of a bone front, and there exists a possibility that it cannot remove cleanly from a bottom face.

In the guide members as described in Patent Documents 8 and 9, grooves formed in a slit shape in the vertical direction are used to guide the cutting tool. However, when such a groove is used as the guide surface, the cutting tool is moved from the transverse direction. While it can be easily positioned by inserting, there is a disadvantage in that the cutting tool easily swings in the groove during the drilling operation, and thus cannot perform a stable drilling operation.

Therefore, the present invention is capable of recovering the cuttings generated by the drilling operation to form a hole in which the implant can be stably inserted and at the same time medical cutting can easily set the medical cutting tool to perform a stable drilling operation An object of the present invention is to provide a sphere, a guide member thereof, and a resected bone collection port.

The medical cutting tool according to the present invention is a medical cutting tool for providing a cutting portion at one end of the tubular body portion and rotating the cutting center about the central axis of the body portion to perform a cutting operation, wherein the cutting portion is radiated toward the outer circumference from the central axis. A plurality of cutting edge portions formed to extend in a shape and at the same time the center side is continuously installed to cover the end openings of the main body portion, a central tip portion protruding outward along the central axis in the central portion of the cutting edge portion, and the cutting It is characterized by including a plurality of inlet openings formed between the blades and introducing cutting objects into the body. In addition, an outer peripheral tip portion protruding in the direction of the central axis is formed on the outer peripheral side of the cutting edge portion. In addition, the cutting edge portion is characterized in that the blade end is formed by crossing one side along the central axis and the other side inclined with respect to the central axis. Moreover, the take-out member which takes out the cutting-material which was introduce | transduced from the said inlet part is mounted in the said main-body part, It is characterized by the above-mentioned.

An ablation bone collection port according to the present invention is an ablation bone harvesting port for collecting bone that is excised using a tubular bone cutting tool, and has a tubular insertion member having a shape that can be inserted into a cutting mark of the bone cutting tool; And a supporting member provided with a rod-shaped screw fixing portion which is detachably supporting the insertion member in the direction of the central axis and extending along the central axis in the interior of the insertion member. The insertion member may be screwed to the support member. Moreover, the said screw fixing part is set so that the front-end | tip may become inward of the opening edge part of the said insertion member, It is characterized by the above-mentioned. In addition, the screw fixing portion is characterized in that the tip portion is formed in a tapered shape so that the pointed shape.

The guide member of the medical cutting tool which concerns on this invention is a guide member of the medical cutting tool which installs a cutting part in the front end side, and rotates about a central axis, and performs cutting operation, The main body part formed so that it can be attached to a surgical site, and the said medical cutting A guide surface having an inner diameter equal to or slightly larger than the outer diameter of the outer circumferential surface of the sphere is formed to penetrate the body portion in the vertical direction, and a guide portion for guiding the medical cutting tool in the cutting direction, and the guide portion is cut out in the vertical direction. And a slit groove formed in a width narrower than the inner diameter of the guide portion, wherein the width of the slit groove is narrower than the outer diameter of the outer circumferential surface of the medical cutting tool and is set wider than the width of the insertion portion formed by cutting a part of the outer circumferential surface in a narrow width. By inserting the insert into the slit groove The medical cutting tool is inserted into and mounted from the transverse direction with respect to the guide portion. The guide portion is formed by fixing a cylindrical member having a slit corresponding to the slit groove portion to the main body portion.

A separate 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 the outer diameter is set to be substantially equal to or slightly smaller than the inner diameter of the guide surface in at least a portion of the outer peripheral surface thereof. A portion of the outer circumferential surface is cut in the region, and the insert portion is formed to have a narrow width.

The medical cutting tool according to the present invention has the configuration as described above, so that a plurality of cutting edge portions are radially formed to cover one end opening of the tubular body portion, and the center portions of the plurality of cutting edge portions are continuously provided and centered. Since the central tip portion protrudes outwardly along the axis, rotating the main body portion about the central axis rotates a plurality of cutting edges radially extending around the central tip portion to perform a stable cutting operation in the direction of the central axis. have.

Moreover, since the some inlet part which introduces a cutting object into the tubular main body part is formed between the some cutting edge parts, the cutting object cut by the cutting edge part will be accommodated in the inside of a main body part as it is. Therefore, after completion of the cutting operation, the cutting material accumulated in the main body portion can be recovered and reused, and the cutting material can be reliably recovered without spilling the cutting object.

In addition, the cutting edge portion is formed on the outer circumferential side of the outer circumferential tip portion protruding in the direction of the center axis, whereby the center tip and the outer circumferential tip portion lead the cutting operation to enable more stable cutting operation. As the center and the outer peripheral portion protrude and are cut, the bottom face of the hole to be opened by the cutting operation is close to the shape of the implant. When the cutting is performed until the center tip becomes a predetermined depth, the implant can be drilled to the depth where the implant can be inserted. As a result, unnecessary cutting of the living bone can be eliminated, and damage to the living bone can be suppressed. In addition, since it can be finished with a hole having a shape close to the implant, the gap between the inserted implant and the hole becomes small, so that bone regeneration around the implant can be accelerated.

In addition, since the cutting edge portion is formed by intersecting one side along the central axis and the other side inclined with respect to the central axis, the cutting edge portion can have sufficient strength even when the cutting edge portion is formed to cover the end opening. And the part where one side of one cutting edge part and the other side of the cutting edge part adjacent to it is formed in a curved shape, and since the inlet part is formed in this curved part, the living body cut | disconnected at the blade edge | tip The cutting of the bone is smoothly introduced into the inlet port with the rotation of the main body, and the cutting can be reliably recovered in accordance with the rotation of the main body.

In addition, by attaching the takeout member for taking out the cutting material introduced from the inlet port in the tubular body part, the cutting material accumulated in the body part with the cutting operation can be taken out efficiently.

By having the above-described configuration, the ablation bone harvesting opening according to the present invention supports a tubular insertion member having a shape that can be inserted into a cutting mark of a bone cutting tool, and supports the insertion member in a central axial direction, and at the same time, the insertion member. Since the support member provided with the rod-shaped screw fixing part which extends along a central axis in the inside of the inside is provided, it supports it, inserting an insertion member into the cutting mark formed in the living bone using the tubular bone cutting tool with a tooth formed in the front-end | tip. When the member is rotated, the internal screw fixing part is screwed into the living bone, and when the supporting member is pulled out while the screw fixing part is screwed in, the entire bone of the ablation portion can be taken out as it is. Then, the screw fixing portion is screwed in while inserting the insertion member into the cutting mark, so that the screw fixing portion is screwed into the bone of the cutting portion without fail from the bone of the cutting portion, and when the support member is drawn out, the screw fixing portion is pulled out. Since the bone is separated and collected at the distal end portion, it can be reliably collected without leaving the entire bone of the ablation portion.

Therefore, the insertion mounting hole of the implant formed in the bone after the bone is collected can be finished to the depth when cut. Further, the collected bone is removed from the support member along the direction of the central axis to expose the entire bone of the ablation portion screwed into the screw fixing portion, and when the screw fixing portion is removed from the bone of the ablation portion, As in the case, the bone of the ablation portion can be easily obtained without leaking to the outside. In addition, the bones thus collected are collected in the state of living bones without being crushed, so that the surface and the internal tissue of the bones can be obtained in the state of the bones, and the treatment can be performed by dividing the bones by the parts of the bones.

In addition, when the insertion member is screwed to the support member and installed, the insertion member can be easily detachably installed in the central axis direction, and the operation can be stably operated without the insertion member being removed even when the support member is operated while rotating the support member.

If the distal end of the screw fastening portion is set to be inward of the opening end of the insertion member, the distal end of the screw fastening portion comes into contact with the bone while the opening end of the insertion member is inserted into the cutting mark of the bone cutting tool. The support member can be rotated in a state where the screw insertion position and direction of the front end portion are set securely by the insertion of the insertion member, and the screw fixing portion can be screwed in a stable state without shifting from the bone of the cutout portion. .

In addition, when the screw fixing portion is formed into a tapered shape so that its tip is pointed, the screw fixing portion can be smoothly inserted into the bone, and even when the screw fixing portion is removed from the bone, the bone can be easily removed without breaking the bone. have.

Since the guide member of the medical cutting tool which concerns on this invention has the structure as mentioned above, the width | variety of a slit groove part is set narrower than the outer diameter of the outer peripheral surface of a medical cutting tool, and it set it wider than the width | variety of the insertion part formed by cutting a part of this outer peripheral surface and forming a narrow width. Therefore, it is possible to easily insert the medical cutting tool into the guide portion and to operate the medical cutting tool stably when the medical cutting tool is rotated to perform the drilling operation.

That is, in the case where the medical cutting tool is inserted into the guide part, when the insertion part of the medical cutting tool is inserted in the lateral direction corresponding to the slit groove part, the width of the slit groove part is set to be wider than the width of the inserting part. It can pass easily, and it becomes possible to attach a medical cutting tool to a guide part easily.

When the medical cutting tool is rotated in the state of being inserted into the guide portion, the width of the slit groove is set to be narrower than the outer diameter of the outer circumferential surface of the medical cutting tool, so that the medical cutting tool protrudes from the guide part to the slit groove during the rotation operation. That is reliably prevented. Therefore, the medical cutting tool is rotated in a stable state in the guide portion, and the medical cutting tool can be accurately guided in the preset cutting direction.

In addition, by using a cylindrical member having a slit corresponding to the slit groove portion fixed to the main body portion as a guide portion, it is possible to smoothly perform the rotation operation by using a material having high slip resistance with respect to the rotation movement in the cylindrical member. It becomes possible. When the cylindrical member is precisely molded and fixed in advance to the main body portion, the accuracy of the inner circumferential surface of the guide portion can be increased, and the cutting direction of the medical cutting tool can be set with high accuracy.

In the case of manufacturing the guide member, if the cylindrical member formed in advance is fixed and the guide portion is formed, the guide member with high precision can be easily manufactured as compared with the case of directly processing the main body portion to form the guide portion.

1 is an exploded perspective view of a medical cutting tool according to the present invention.

2 is a side view, a front view and a cross-sectional view taken along the central axis of the cutting member.

3 is a perspective view showing a state in which the cutting member is fixed to the support member.

4 is an explanatory view of a cutting operation for drilling a living bone.

5 is a perspective view of a supporting member according to a modification.

6 is an explanatory view of a cutting operation of a modification.

7 is an explanatory diagram of a cutting operation of another modification.

Figure 8 is an exploded perspective view of the resection bone extraction port according to the present invention.

9 is a cross-sectional view of the embodiment shown in FIG. 8.

10 is a partially enlarged cross-sectional view of FIG. 9.

Fig. 11 is a perspective view showing a mounting state of the drive head.

12 is a perspective view of the bone cutting tool.

Fig. 13 is an explanatory diagram showing a cutting process by a bone cutting tool.

14 is an explanatory diagram showing a collection process by the resection bone collection port.

15 is an external perspective view of a guide member of a medical cutting tool according to the present invention.

16 is a perspective view of a cylindrical member.

17 is a top view of the guide portion.

18 is a perspective view of a cutting tool.

19 is a front view and a side view of the cutting tool.

20 is an explanatory view of a manufacturing process of the guide member.

21 is an explanatory view of a manufacturing process of the guide member.

22 is an explanatory view of a manufacturing process of the guide member.

23 is an explanatory view of a manufacturing process of the guide member.

24 is an explanatory view of a manufacturing process of the guide member.

25 is an explanatory diagram for explaining a process of inserting and cutting a cutting tool into a guide member.

Fig. 26 is an explanatory diagram illustrating a process of inserting and cutting a cutting tool into a guide member.

27 is an explanatory diagram for explaining a process of inserting and cutting a cutting tool into a guide member.

Fig. 28 is a sectional view of a state where an insertion portion is inserted and mounted in a cylindrical member.

[Description of the code]

1: support member

10: main body

2: cutting member

20: main body

21: cutting part

23 cutting edge

24: center tip

25: Outsourcing tip

26: introduction port

3: extraction member

30: main body

30a: home

4: extraction member

41: main body

43: communication hole

5: support member

50: screw fixing part

51: installation

52: screw mounting

53: flange

6: insertion member

60: main body

61: installation unit

62: opening

80: main body

81: guide part

82: slit groove

83: cylindrical member

84: slit

90: cutting tool

91: support member

92: cutting member

94: cutting part

98: insertion unit

EMBODIMENT OF THE INVENTION Hereinafter, embodiment which concerns on this invention is described in detail. In addition, although embodiment described below is a preferable specific example in implementing this invention, technically various limitation is made, but this invention does not mention the meaning which limits this invention especially in the following description. However, it is not limited to these forms.

1 is an exploded perspective view of a medical cutting tool according to the present invention. The medical cutting tool is provided with the support member 1 and the cutting member 2. As for the support member 1, the flange part 11 and the screw fixing part 12 are formed in one end side of the rod-shaped main-body part 10, and the locking part 13 is formed in the other end side. . The cutting member 2 is provided with the cutting part 21 in one end of the cylindrical main-body part 20, and the installation screw part 22 is formed in the other end.

The mounting screw part 22 is provided with the screw groove in the inner peripheral surface of the main-body part 20, and is screwed to the screw fixing part 12 of the support member 1. As shown in FIG. And the installation screw part 22 is screwed until it comes in contact with the flange part 11, and the cutting member 2 is being fixed to the support member 1.

The locking portion 13 of the support member 1 is cut and formed to leave the end portion in a flange shape at a predetermined thickness, and is partially cut along the central axis of the support member 1. And the locking part 13 is provided in the drive head which is not shown in figure, and the support member 1 is driven to rotate about the center axis by the drive head. The cutting members 2 are set so that their central axes coincide with each other in a state where they are fixed to the support member 1.

Fig. 2 is a side view (Fig. 2 (a)), a front view (Fig. 2 (b)) and an A-A cross section (Fig. 2 (c)) of the cutting member 2, respectively. The cutting portion 21 is provided with three cutting edge portions 23. Each cutting edge portion 23 extends radially from the central axis O of the main body portion 20 toward the outer circumference, and the center side of each cutting edge portion 23 is continuously provided to open the end of the main body portion 20. It is formed to cover.

Each cutting edge portion 23 extends radially from the central axis O of the main body 20 toward the outer circumference and extends radially from the side surface 23a and the central axis O formed along the central axis O. As a result, the side surfaces 23b formed to be inclined with respect to the central axis are crossed to form a blade tip 23c.

And the center tip part 24 is formed in the center part in which the three cutting edge parts 23 were continuously provided so that it might protrude out along the center axis O. The central tip 24 is formed so that the blade tip 23c of the cutting blade 23 converges and is tapered in a sharp shape. Moreover, the outer peripheral edge part 25 is formed in the outer peripheral side edge part of three cutting blade parts 23 so that the blade tip 23c may protrude outward in the direction of the center axis O, and the blade edge 23c of each cutting blade part 23 is formed. ) Is finished in a curved shape with both ends protruding outward. The center tip 24 is set so as to project slightly outward from the outer circumferential tip 25.

Between each cutting edge portion 23, the inclined side surface 23b and the side surface 23a of the adjacent cutting edge portion 23 are formed in a curved shape, and the inlet portion 26 is formed in each of the curved portions. Is formed to communicate with the inside of the main body 20.

3 is a perspective view showing a state in which the cutting member 2 is fixed to the support member 1. By cutting the support member 1 in the support member 1 and rotating the support member 1 about the central axis, the cutting portion 21 rotates the cutting edge portion 23 about the central tip portion 24 in the cutting portion 21. Then, the cutting edge 23c of the cutting blade portion 23 extending radially from the center tip portion 24 is rotated to perform the cutting operation.

4 is an explanatory view of a cutting operation for drilling a living bone. First, the flesh portion M, which covers the perforated surface of the bone portion B, is removed to expose the bone portion B, and the central tip 24 of the cutting portion 21 on the surface of the exposed bone portion B. ) And the outer periphery tip 25. Then, a force is applied in the direction of the central axis so that the distal ends of the central tip 24 and the outer peripheral tip 25 are penetrated into the bone B, thereby positioning the cutting member 2 in a stable state (Fig. 4). (a)].

After positioning the cutting member 2 with respect to the bone portion B, the supporting member 1 is driven to rotate, and the cutting member 2 is rotated about the central axis. Then, when a force is applied to the cutting member 2 in the central axis direction, the blade tip 23c formed from the center tip 24 to the outer circumferential tip 25 rotates and is in sliding contact with the surface of the bone portion B. The cutting operation is performed. At that time, the center tip part 24 protrudes to the outermost side, always penetrates into the bone part B, and a stable cutting operation | movement is performed, without a position shift occurring. In addition, since the blade tip 23c rotates while the outer peripheral tip portion 25 protrudes outward, the cutting operation is performed, so that the cutting portion 21 can be accurately drilled in the direction of the central axis without being shaken.

And the cutting object G of the bone part fractured by the cutting edge part 23 is guide | induced to the curved part between the cutting edge parts 23, and is introduce | transduced into the main body part 20 from the inlet part 26. Goes. Since the crushed cutting object G is introduced into the main body 20 immediately after being cut, it can be recovered without mixing impurities (Fig. 4 (b)).

When the cutting member 2 is pulled up after the cutting operation to a predetermined depth, a circular hole H having a diameter substantially the same as that of the cutting member 2 is drilled (Fig. 4 (c)). The bottom surface of the hole H is slightly recessed by the center tip 24 and the outer peripheral tip 25 of the cutting portion 21 but is formed in a planar shape perpendicular to the central axis of the cutting member 2. have. Therefore, as shown in Fig. 4 (d), when the implant I is inserted into the hole H, the gap between the two becomes small, and the implant I can be positioned in a stable state. . In addition, since the gap between the implant (I) and the bone portion (B) is small, healing by bone regeneration is performed early. And since it can penetrate by the cutting operation only as much as a part necessary for insertion insertion of an implant, it becomes possible to suppress the damage to a living bone to the minimum.

Although three cutting edge parts are provided in the example demonstrated above, what is necessary is just to form a plurality of cutting edge parts, and it is not limited to three. In addition, the shape of a cutting edge part should just be a shape in which the curved part was formed between the adjacent cutting edge parts, and what is necessary is just to change the shape of the cutting edge part mentioned above as needed.

FIG. 5 is a perspective view showing a modification in which the support member 1 is provided with a takeout member for taking out the cutting collected in the main body 20 of the cutting member 2. In the example shown in FIG. 5A, the extraction member 3 is fixed to the center portion of the screw fixing portion 12. In addition, in another example shown in FIG. 5B, the extraction member 4 is fixed to the center portion of the screw fixing portion 12.

The take-out member 3 is formed with a spiral groove 30a on the outer circumference of the cylindrical main body portion 30 having a diameter slightly smaller than the inner circumferential surface of the cutting member 2. The surface of the tip portion 31 of the body portion 30 is formed in a conical shape so as to coincide with the inner surface of the cutting portion 21 of the cutting member 2. And the spiral groove 30a is formed to the surface of the front-end | tip part 31, and when the front-end | tip part 31 contacts the inner surface of the cutting part 21, the inlet part 26 of the cutting part 21 is carried out. The grooves 30a are set to face each other.

FIG. 6 is an explanatory diagram in the case where the cutting member 2 is provided in the supporting member 1 shown in FIG. Since the cutting operation is the same as the operation described with reference to FIG. 4, the description is omitted. When the cutting member 2 is provided in the support member 1 on which the takeout member 3 is fixed, the outer circumferential surface of the main body 30 of the takeout member 3 is in contact with the inner circumferential surface of the cutting member 2 with almost no gap. In addition, the surface of the tip 31 of the takeout member 3 is also in a state in which it is in close contact with the inner surface of the cutting portion 21 (Fig. 6 (a)).

When the support member 1 is rotated and the cutting operation is performed, the cutting material is recovered from the inlet portion 26 into the cutting member 2, but the recovered cutting material G is guided to the groove 30a. [Fig. 6 (b)]. Therefore, as the cutting operation progresses, the cutting objects are sequentially pressed into and accumulated in the spiral grooves 30a.

When the cutting member 2 is removed from the supporting member 1 after the cutting operation is finished, the cutting material G accumulated in the groove 30a remains as it is, and the cutting material G is removed from the inside of the cutting member 2. It can be taken out cleanly (Fig. 6 (c)).

In the takeout member 4 shown in Fig. 5B, a disc-shaped main body portion 41 is fixed to the distal end of the elongated rod-shaped mounting portion 40. The mounting portion 40 is standing up so as to follow the central axis in the center of the screw fixing portion 12. The main body portion 41 is formed to have a diameter slightly smaller than the inner circumferential surface of the cutting member 2, and the tip portion of the mounting portion 40 is fixed to the central portion of the bottom face. The surface of the tip portion 42 of the main body portion 41 is formed in a conical shape so as to coincide with the inner surface of the cutting portion 21 of the cutting member 2. In addition, a plurality of communication holes 43 are formed in the main body portion 41 so as to pass through the tip portion 42 and the bottom surface.

FIG. 7 is an explanatory diagram in the case where the cutting member 2 is attached to the supporting member 1 shown in FIG. Since the cutting operation is the same as the operation described with reference to FIG. 4, the description is omitted. When the cutting member 2 is provided on the support member 1 on which the takeout member 4 is fixed, the outer circumferential surface of the main body portion 41 of the takeout member 4 is in contact with the inner circumferential surface of the cutting member 2 with almost no gap. Then, the surface of the tip portion 42 of the takeout member 4 is also in a state close to the inner surface of the cutting portion 21 (Fig. 6 (a)). And in the state which the cutting member 2 was provided in the support member 1, the communication hole 43 formed in the main-body part 41 is located in the position which opposes the inlet part 26 of the cutting part 21. As shown in FIG. The state of communication between them becomes.

When the support member 1 is rotated and the cutting operation is performed, the cutting object is guided to the inlet port 26 and is recovered inside the cutting member 2 through the communication hole 43 (Fig. 7 ( b)]. Therefore, the cutting object G accumulates above the main body 41 as the cutting operation progresses.

When the cutting member 2 is removed from the supporting member 1 after the cutting operation is completed, the cutting material G accumulated above the main body portion 41 is pulled up as it is, and the cutting material (from the inside of the cutting member 2 is cut out ( G) can be taken out cleanly (FIG. 7 (c)).

Figure 8 is an exploded perspective view of the resection bone extraction port according to the present invention. The ablation bone harvesting port is provided with the support member 5 and the insertion member 6.

The support member 5 is a rod-shaped body in which a flange portion 53 is formed in a substantially central portion, and the flange portion 53 protrudes in a disk shape, and cuts a part of the outer circumferential surface to form a planar locking portion 53a. Pair is formed. And the screw fixing part 50 is formed in the one side from the flange part 53 via the screw mounting part 52 in which the thread was formed in the outer periphery.

The screw fixing part 50 extends in the shape of a rod along the central axis of the supporting member 5, and a spiral thread is formed on the entire outer circumferential surface thereof. And the whole shape of the screw fixing part 50 is formed in taper shape so that it may become a pointed shape as it goes to a front end part.

On the other side of the flange portion 53, an installation portion 51 is provided which is provided to a drive head (not shown). The mounting part 51 is formed in the column shape along the central axis of the support member 5, and the mounting part 51a attached to the drive head is fixed to the front-end | tip.

The support member 5 is made of a metal material such as stainless, and the entire shape thereof is integrally formed by cutting or the like.

The insertion member 6 includes a main body portion 60 formed in a cylindrical shape, and an installation portion 61 in which a screw groove is formed on an inner circumferential surface is provided at one end of the main body portion 60, and an opening portion is provided at the other end thereof. 62 is provided. On the outer circumferential surface of the main body 60, a scale indicating the inserted depth may be displayed.

The mounting portion 61 is fitted to the screw mounting portion 52 of the supporting member 5 so that the insertion member 6 is detachably attached to the supporting member 5. In addition, a part of the outer circumferential surface of the mounting portion 61 is cut out to form a pair of planar locking portions 61a. The locking portion 61a is not shown together with the locking portion 53a formed in the flange portion 53 when the insertion member 6 is fastened and fixed to the supporting member 5 or removed from the supporting member 5. The insertion member 6 can be easily attached to and detached from the support member 5 by inserting mounting tools, respectively, and rotating them back.

The opening part 62 of the insertion member 6 is formed in the taper shape of the outer peripheral surface, and it is made to insert easily into a cutting mark as mentioned later.

The insertion member 6 is made of a metal material such as stainless, similarly to the support member 5, and its overall shape is integrally formed by cutting or the like.

In the case where the insertion member 6 is attached to the support member 5, the mounting portion 61 is inserted into the screw mounting portion 52 by being inserted in the direction of the central axis from the distal end of the screw fixing portion 50, Also in the case of removal, it moves to the center axis direction of the support member 5, and it removes.

9 is a cross-sectional view along the central axis of the supporting member 5 in the state where the insertion member 6 is provided in the supporting member 5. When the central axis of the screw fixing portion 50 of the support member 5 coincides with the central axis of the main body portion 60 of the insertion member 6, and the mounting portion 51 is installed on the handpiece and driven to rotate, The screw fixing part 50 and the main body part 60 rotate about the rotating shaft T. As shown in FIG. As shown in an enlarged cross-sectional view of a portion of FIG. 10, the pointed tip 50a of the screw fixing part 50 and the center of the opening 62 are located on the rotation shaft T, and the tip 50a is formed in the opening ( 62), it is set to position slightly inward.

In addition, the shape, such as the outer diameter of the screw fixing part 50, and the shape, such as the outer diameter of the main body part 60, are prepared in multiple types according to the type of the bone cutting tool for drilling the insertion mounting hole for implants, and to select a corresponding thing. Just do it.

FIG. 11 is a perspective view showing a case where the supporting member 5 is attached to the handpiece K. FIG. The installation part 51 of the support member 5 can be inserted in the mounting part J of the handpiece K, and can be installed easily. Then, by holding and operating the handpiece K, the procedure for the implant is performed.

12 is a perspective view of the bone cutting tool 7. The bone cutting tool 7 is provided with a mounting portion 71 on one side of the cylindrical main body portion 70, and is provided with a cutting portion 72 having teeth formed on the tip of the other side. In addition, a circular cut mark may be formed on the bone by installing and installing the mounting portion 71 on the driving head in the same manner as in the above-described cutting bone extraction port. Such bone cuts are known.

FIG. 13 is an explanatory diagram showing a cutting process by the bone cutting tool 7. FIG. When the bone cutting tool 7 is rotated, the main body portion 70 rotates with its central axis as the rotation axis, and the circular cut portion 72 similarly rotates with its center as the rotation center (Fig. 13 (a). )]. And the cutting | disconnection is performed by pressing a cutting | disconnection part to the target site | part of the bone B, while rotating the cutting | disconnection part 72 (FIG. 13 (b)). A scale indicating the cutting depth is displayed on the outer circumferential surface of the body portion 70, and the body portion 70 is press-fitted while rotating the body portion 70 to the required depth while checking the scale. When the bone cutting tool 7 is raised after cutting to the required depth, a circular cutting mark C is formed, and the bone B1 of the cutout portion remains in a cylindrical shape (Fig. 13 (c)). ].

Fig. 14 is an explanatory diagram showing a process of collecting the bone B1 of the remaining excised portion through the dissected bone harvesting port. First, the opening portion 62 of the insertion member 6 of the cut bone harvesting opening is inserted into the cutting mark C and aligned, and at that time, the tip 50a of the screw fixing portion 50 inside the bone of the cut portion ( It is positioned to flower in the center of the circular surface of B1) (Fig. 14 (a)).

After the alignment, the screw fixation section 50 is rotated to drive the screw fixing portion 50 so as to be screwed into the bone B1 of the cut portion. At that time, since the main body portion 60 of the insertion member 6 is guided along the outer circumference of the bone B1 of the cutout portion, the screw fixing portion 50 does not deviate from the central axis of the bone B1 of the cutout portion. The screw is inserted without it (Fig. 14 (b)). When the screw fixing part 50 is screwed in, the portion of the bone is pressed toward the inner circumferential surface of the insertion member 6, and the bone B1 of the cutout portion is kept in press contact with the insertion member 6. Becomes

After inserting the insertion member 6 to the required depth while confirming the scale marked on the outer circumferential surface of the insertion member 6, the bone B1 of the cutout portion is separated by being pulled out by drawing out the cutting bone extraction port. At that time, since the distal end portion 50a of the screw fixing portion 50 is screwed to the bottom of the bone B1 of the cutout portion, the entire bone B1 of the cutout portion can be removed to be removed. Therefore, the hole formed after separation can be finished to the same dimension as the design with no residue on the bottom surface, and the insertion and insertion of the implant can be performed smoothly (Fig. 14 (c)).

The ablation bone harvesting port that separates and holds the bone B1 of the ablation portion is removed from the drive head, and is removed from the screw mounting portion 52 of the support member 5 by rotating the insertion member 6 by the installation tool. Then, by moving the main body portion 60 in the central axis direction, the insertion member 6 can be removed while holding the bone B1 of the cut-off portion in the screw fixing portion 50 (Fig. 14 (d). )].

After the insertion member 6 is removed, the screw fixing portion 50 is extracted from the bone while the support member 5 is rotated while the bone B1 of the cutout portion is held (Fig. 14 (e)). In this way, it is possible to extract the bone B1 of the cutout portion as it is in the living bone without spilling it to the outside (Fig. 14 (f)). The collected bone may be crushed and used as a filling material for the implant insertion hole, and the particle size of crushing can be freely set at that time, so that it can cope with fine detail according to the state of the implant. Moreover, since it can extract | collect as it is from a living bone, it is also easy to isolate | separate the used bone according to a site | part.

As described above, since the cut bones can be easily removed in a short time and collected in the same state, the collected bones can be effectively utilized widely in the treatment of various implants.

15 is an external perspective view of a guide member of a medical cutting tool according to the present invention. The guide member is used for dental treatment. The guide portion 81, the guide portion 81, which guides the main body portion 80 to be mounted on the dental dentition of the patient, the cutting tool for performing the drilling operation for mounting the implant in the cutting direction. The slit groove part 82 which cut | disconnected and opened side of the side is provided.

The main body portion 80 is formed using a known resin material. As the resin material, for example, vinyl chloride resin, vinyl acetate resin, polyester resin, ABS resin, acrylic resin, fluorine resin, polyamide resin, acetal resin, polycarbonate and the like are used. In view of the convenience in carrying out the procedure of the implant, the resin material is preferably transparent or translucent.

The main body 80 is molded by bringing the resin material in the molten state into contact with the teeth, such as gypsum, which is modeled after the patient's teeth. Therefore, the lower surface of the main body portion 80 can be molded into a shape in close contact with the teeth. Moreover, it can also be set as the shape which adhered to the tooth shape from upper direction in the state which heated and casted the plate-shaped resin material.

The guide portion 81 is formed by embedding and fixing the cylindrical member 83 as shown in FIG. 16 to the main body portion 80. The cylindrical member 83 penetrates the main body 80 in the vertical direction, and the inner circumferential surface is a guide surface for guiding the cutting tool in the cutting direction. The cylindrical member 83 is cut | disconnected to the up-down direction by predetermined width, and the slit 84 is formed.

17 is a top view of the guide portion 81. The width d of the slit 84 is set to be narrower than the inner diameter D of the inner peripheral surface of the cylindrical member 83. The inner diameter D of the cylindrical member 83 is set to be substantially equal to or slightly larger than the outer diameter of the outer circumferential surface of the cutting tool to be inserted into the guide portion 81, and the inserted cutting tool is inserted into the guide portion 81. Rotation operation is performed stably without rattling in the inside. And since the width | variety d of the slit 84 is narrower than the inner diameter D, the cutting tool during rotation operation does not shift | deviate with the slit 84.

As described later, the cylindrical member 83 is mounted in advance on a metal rod set in an implant-filled hole drilled in a tooth, and is formed of a resin material that forms the main body 80 with the metal rod set in a tooth. By covering and solidifying the teeth, it is possible to accurately position along the cutting direction for embedding the implant.

As the material used for the cylindrical member 83, a resin material or a metal material excellent in high strength, abrasion resistance, and sliding property is preferable, and the cutting tool is scraped off during the rotation operation in the guide portion 81 and scattered to the outside. In consideration of the fact that it is preferable to select the harmless to the human body. For example, polyacetal is preferable as the resin material, and titanium is preferable as the metal material.

The slit groove portion 82 is formed by cutting the main body portion 80 into a groove shape so as to extend laterally from the slit 84 of the cylindrical member 83. The groove width of the slit groove portion 82 is set to be equal to or larger than the width of the slit 84 as shown in FIG. have.

FIG. 18 is a perspective view of a cutting tool 90 inserted into the guide member 1, and FIG. 5 is a front view (FIG. 19A) and a side view (FIG. 19B) of the cutting tool. The cutting tool 90 includes a support member 91 and a cutting member 92. The support member 91 is formed in rod shape, and the locking part 93 for attaching to the upper end part in the handpiece which is not shown in figure is formed. The cutting member 92 is formed in a cylindrical shape, and a saw-shaped cutting portion 94 is formed at the lower end portion.

A scale 95 composed of a plurality of lines is displayed on the outer circumferential surface of the cutting member 92, and the drilled depth of the cutting member 92 can be confirmed by the scale 95. In addition, between the lines of the scale 95, a pair of rectangular openings 96 are drilled at positions symmetrical with respect to the central axis. On the lower end side of the opening 96, a pair of separate openings 97 are drilled similarly to the opening 96. By forming these opening parts 96 and 97, the cutting material gathered in the inside of the cutting member 92 can be taken out during the drilling operation of the cutting tool 90. FIG.

An insertion portion 98 is formed between the opening portion 97 and the cutting portion 94. The insertion part 98 is set to the width | variety d 'narrower than the outer diameter D' of the outer peripheral surface of the cutting member 92 by notching at the position of the same width on both sides from the center axis | shaft. The outer diameter D 'of the cutting member 92 is set to be substantially equal to or slightly smaller than the inner diameter D of the cylindrical member 83, and the width d' of the insertion portion 98 is a cylindrical member ( It is set so that it may become slightly smaller than the width | variety d of the slit 11 of 83). In addition, the length of the insertion portion 98 is set slightly longer than the length of the cylindrical member 83.

20-24 is explanatory drawing about the manufacturing process of a guide member. Fig. 20 is a perspective view of the patient's teeth, and the teeth 101 are formed on the upper portion of the U-shaped base 100. And the embedding hole 102 is previously drilled in the site | part which embeds an implant. The buried hole 102 is drilled along a buried direction based on an X-ray image of a patient's procedure site or the like.

In Fig. 21, a metal rod 110 of the same diameter as the cutting member 92 of the cutting tool is inserted into the buried hole 102 drilled in the tooth of the patient. The cylindrical member 83 is fitted to the metal rod 110, and is installed. The mounting position of the cylindrical member 83 is set to a predetermined height so that the cutting portion 94 does not contact the gums when the cutting tool 90 is inserted into the cylindrical member 83.

In Fig. 22, the entire dental teeth are covered with the molten resin material in a state where the metal rod 110 is inserted and mounted. At that time, the cylindrical member 83 provided in the metal rod 110 is closely attached so that it may be embedded with a resin material, and the part corresponding to the slit 84 is shape | molded so that it may be cut out. In this way, the resin material is solidified and the main body portion 80 of the guide member is molded.

In Fig. 23, the guide member 81 formed with the guide portion 81 can be formed by removing the solidified main body portion 80 from the teeth and drawing the metal rod 110 from the cylindrical member 83. And since the cylindrical member 83 is fixed in the state fitted to the metal rod 110, the inner peripheral surface of the cylindrical member 83 is set so that it may guide in the cutting direction which is the embedding direction of an implant. A slit-shaped groove 85 is formed in the portion corresponding to the slit 84 of the guide portion 81.

In Fig. 24, the resin material below is cut from the lower surface of the cylindrical member 83, and the grooves 85 are also cut off so that the tip extends from the slit 84, so that the guide portion 81 and the slit groove portion 82 Finish processing is performed.

By manufacturing as mentioned above, the guide member can be shape | molded by accurately positioning the cylindrical member 83 shape | molded previously in the cutting direction of the cutting tool which is the embedding direction of an implant. In addition, since the lower surface of the body portion 80 is molded in a shape conforming to the teeth of the patient, the guide member can be mounted in close contact with the teeth of the patient at the time of the procedure, and the drilling operation is performed in a stable state without being shaken during the rotation operation of the cutting tool. It becomes possible to do this.

In the above manufacturing process, the molten resin material is solidified and fixed together with the cylindrical member, but once the molten resin material is solidified to fit the teeth to form the main body portion, the portion where the cylindrical member is fixed is deleted. You may position the metal rod which fitted the cylindrical member to the part to which it adhered, and adhere | attach it with the melted resin material between the main-body part. In the case where the main body portion is molded using a plate-shaped resin material, a portion for fixing the cylindrical member may be deleted to adhesively fix the cylindrical member.

25-27 is explanatory drawing which shows the process at the time of inserting and inserting the cutting tool 90 in a guide member. As shown in Fig. 25, the guide member is mounted on the patient's dentition to accurately position the guide portion 81 at the implant site. After setting the guide member, as shown in FIG. 26, the handpiece K provided with the cutting tool 90 is introduced along the slit groove 82 from the transverse direction of the guide portion 81. As shown in FIG. At that time, the insertion part 98 formed in the cutting member 92 of the cutting tool 90 is inserted facing the slit groove 82. FIG. 28A is a cross-sectional view showing a state where the insertion portion 98 is inserted into the cylindrical member 83 of the guide portion 81. Since the width of the insertion portion 98 is slightly smaller than the width of the slit 84, the cutting tool 90 can be inserted into the cylindrical member 83 only from the insertion portion 98.

When the cutting tool 90 is rotated after the insertion portion 98 is mounted on the cylindrical member 83, the insertion portion 98 is displaced from the slit 84, so that the cutting tool 90 is the slit 84. It is hold | maintained in the stable state in the cylindrical member 83, without taking out from the.

When the cutting tool 90 is held in the cylindrical member 83, the cutting tool 90 is guided in the cutting direction. As shown in Fig. 27, by rotating the cutting tool 90, the cutting part 94 is inserted into the gum M to operate to drill a circular hole. The depth by the drilling operation can be precisely drilled to a predetermined depth by checking the scale displayed on the cutting member 22.

FIG. 28B is a cross-sectional view showing a state in which the insertion portion 98 of the cutting member 92 rotates in the cylindrical member 83 of the guide portion 81. Since the cutting member 92 rotates at high speed in the cylindrical member 83, the insertion portion 98 is hardly deviated from the slit 84. And since the length of the insertion part 98 is set slightly longer than the length of the cylindrical member 83, when the cutting member 92 moves downward by a punching operation, the insertion part 98 will be a cylindrical member ( 83 is axially deviated so that the cutting member 92 can perform a stable rotation operation without deviating from the cylindrical member 83.

Therefore, the cutting member 92 can perform a drilling operation without shaking, and it becomes possible to form the implantation embedding hole as it is designed.

The medical cutting tool according to the present invention can be suitably used for drilling an implant insertion hole in a bone in a surgical operation such as dentistry, oral surgery, orthopedic surgery. And it becomes possible to collect | recover and reuse it, without discarding also cutting objects, such as a crushed object of bone which arises with a cutting operation. Moreover, since a cutting object can be collect | recovered efficiently, even when using as a cutting tool in the case of making a noble metal material, it can collect and reuse without leaving a cutting object.

Claims (11)

It is a medical cutting tool which provides a cutting part at one end of a tubular main body part, and performs a cutting operation by rotating about the central axis of the said main body part, The cutting portion extends radially from the central axis toward the outer circumference and at the same time a plurality of cutting edge portions are formed so as to continuously cover the end openings of the main body portion, and along the central axis in the center portion of the cutting edge portion. And a plurality of inlet openings formed between the central tip portion protruding outwardly and the cutting edge portion to introduce cuttings into the main body portion. The medical cutting tool according to claim 1, wherein an outer peripheral tip portion protruding in the direction of the central axis is formed on the outer peripheral side of the cutting edge portion. The medical cutting tool according to claim 1 or 2, wherein the cutting edge portion has a blade tip formed by crossing one side along the central axis and the other side inclined with respect to the central axis. The medical cutting tool according to any one of claims 1 to 3, wherein an ejecting member for extracting a cutting material introduced from the inlet section is attached to the inside of the main body section. Resection bone resection for collecting bone that is excised using a tubular bone cutting tool, A tubular insertion member having a shape that can be inserted into the cut marks of the bone cutting tool, and a rod-shaped screw fixation that is detachably supported in the direction of the central axis and extended along the central axis in the insertion member. An ablation bone harvesting device, comprising: an additional support member provided. 6. The resection bone harvesting device according to claim 5, wherein the insertion member is screwed to the support member. 7. The cut bone harvesting device according to claim 5 or 6, wherein the distal end portion is set such that the distal end thereof is inward of the opening end of the insertion member. The reticulum harvesting device according to any one of claims 5 to 7, wherein the screw fixing portion is formed in a tapered shape such that its tip is pointed. It is a guide member of a medical cutting tool that provides a cutting portion at the tip end side and rotates about a central axis to perform a cutting operation. A main body portion formed to be mounted on the procedure site and a guide surface having an inner diameter equal to or slightly larger than the outer diameter of the outer peripheral surface of the medical cutting tool are formed to penetrate the main body in the vertical direction and guide the medical cutting tool in the cutting direction. And a slit groove portion formed by cutting the guide portion in a vertical direction and having a width smaller than the inner diameter of the guide portion, wherein the width of the slit groove portion is narrower than the outer diameter of the outer circumferential surface of the medical cutting tool and cuts a part of the outer circumferential surface. It is set wider than the width | variety of the insertion part formed in narrow width | variety, and the said medical cutting tool guide member is inserted from the lateral direction with respect to the said guide part by inserting the said insertion part into the said slit groove part, The guide member of the medical cutting tool characterized by the above-mentioned. The guide member according to claim 9, 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 into the guide part of the guide member of Claim 9 or 10, A medical cutting tool, characterized in that the outer diameter is set to be substantially the same as or slightly smaller than the outer diameter of the guide surface in at least a portion of the outer circumferential surface and the insertion portion is formed to have a narrow width by cutting a part of the outer circumferential surface in the region.

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