Bone Chisel

Abstract

To provide a bone chisel in which the thickness of a blade is thin to stick to a bone smoothly vertically, and the force to be applied at the time when initially inserted is large without the breakage of the bone, and further, as for the force at the time when inserted further to spread a slit is not applied to break the bone.SOLUTION: A bone chisel for implant is provided. The bone chisel has a blade in which the tip end has a taper shape and the side of a blade thickness direction or a blade width direction is curved in a depth direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a bone chisel for dental implants. [Background technology]

[0002] Conventionally, for example, as shown in Figure 11, in order to insert an implant, a bone chisel with a flat tip (straight wedge shape, blade thickness of 0.5 mm, blade opening angle of 11 degrees) is inserted into a 0.3 mm wide slit (gap in the bone) that has been made in advance in the cortical bone with an ultrasonic cutter (ultrasonic scalpel), and the slit is widened to a width of, for example, 1.0 mm.

[0003] Related technology includes a dental cutting tool that is simple to operate and easy to control, with a handle that is detachably connected at one end to a high-speed rotor and a cutting part attached to the other end of the handle, the cutting part tapering along the axis of rotation and having a regular polygonal cross section, and the corners of the cutting part that rotates at high speed scrape away the surface of the bone, with the cross section of the cutting part being a regular polygon with 3 to 6 sides and the longitudinal cross section of the cutting part being spindle-shaped or partially circular, allowing for efficient scraping of bone, with good finished surface quality (see Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Registered Utility Model No. 3063991 Summary of the Invention [Problem to be solved by the invention]

[0005] However, it is difficult to insert a bone chisel with a blade thickness of 0.5 mm into a slit that is 0.3 mm wide. Therefore, there was a need for a bone chisel with a thin blade that could be inserted smoothly and perpendicularly into the bone, that would not apply too much force when first inserted, which would cause the bone to crack, and that would not apply enough force when inserting and widening the slit, which would cause the bone to crack. Here, axe blades with hollow shapes and curved surfaces are known, but the purpose of axes is to split wood with light force, while bone chisels are required to not split bones even when the worker applies strong force. In other words, the purpose of the two is the opposite, and it can be said that the shape of the axe blade is a technology that has an obstacle when it comes to combining them. The present invention is a product-level invention that has been achieved through research and development and empirical data analysis at a level that is practical for use in the dental field, and is not merely an idea.

[0006] To provide a bone chisel having a thin blade that can be smoothly inserted perpendicularly into the bone, and which does not apply a large force that would crack the bone when first inserted, and which does not apply a force that would crack the bone when inserting and widening the slit. [Means for solving the problem]

[0007] The bone chisel of the present invention is dentistry A bone chisel for implants, When the blade width direction is defined as the X direction, the blade thickness direction perpendicular to the blade width direction is defined as the Y direction, and the insertion depth direction perpendicular to the blade width direction and the blade thickness direction is defined as the Z direction, The tip is wedge-shaped, And includes the blade width direction XZ plane The side surface of the side is concavely curved along the depth direction and also concavely curved along the blade width direction. Has a blade.

[0008] The bone chisel of the present invention is The XZ plane both ends surface to A blade having a concave curve along the blade width direction. may be.

[0010] In addition, the bone chisel of the present invention ,blade The blades can be replaced, the blades can be attached to both sides of the handle, and the handle can be hollow. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a bone chisel that has a thin blade that can be inserted smoothly and perpendicularly into the bone, does not apply a large force that would crack the bone when first inserted, and does not apply a force that would crack the bone when inserting and widening the slit. [Brief explanation of the drawings]

[0012] [Figure 1] 1A to 1C are diagrams showing the external configuration of the blade of a bone chisel according to the first to third embodiments of the present invention. [Figure 2] 1A to 1C are diagrams showing the external configuration of bone chisels according to first to third embodiments of the present invention. [Figure 3] 1A to 1C are diagrams illustrating the configuration of a blade of a bone chisel according to a first embodiment of the present invention. [Figure 4] 10A to 10C are diagrams illustrating the configuration of a blade of a bone chisel according to a second embodiment of the present invention. [Figure 5] 10A to 10C are diagrams illustrating the configuration of a blade of a bone chisel according to a third embodiment of the present invention. [Figure 6] 1A to 1C are diagrams illustrating the structure of the handle of a bone chisel according to the first to third embodiments of the present invention. [Figure 7] 10A to 10C are diagrams showing modified examples of the handle structure of the bone chisel according to the first to third embodiments of the present invention. [Figure 8] 10 is a graph showing the relationship between the insertion depth position and the load of the bone chisel according to the first and second embodiments of the present invention. [Figure 9] 10 is a graph showing the relationship between the insertion depth position and the load of the bone chisel according to the third embodiment of the present invention. [Figure 10] FIG. 10 is a diagram showing the external configuration of a blade of a bone chisel according to a fourth embodiment of the present invention. [Figure 11] FIG. 1 is a diagram showing an example of use of a conventional bone chisel. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the external configuration of the blade of the bone chisel according to the first to third embodiments of the present invention.

[0014] The bone chisel blade 10 according to the first embodiment of the present invention has a side including the blade width direction in the X direction. (XZ plane) 101 is in the cutting edge direction along (X direction) The blade 10 has a curved (concave) surface. Wedge The blade 10 has a blade thickness direction in the Y direction. Side including (YZ plane) 103 is in the depth direction of the Z direction Along The blade 10 has a curved (concave) surface. 101 is in the depth direction of the Z direction Along It is curved (concave).

[0015] The bone chisel blade 20 according to the second embodiment of the present invention has a blade width direction in the X direction. Contains side 105 (XZ plane) is in the cutting edge direction along (X direction) It is curved (convex). 20 The tip is Wedge The shape is also 20 teeth, Edge 105 on the XZ plane is in the depth direction of the Z direction Along It is curved (concave). 20 is the cutting edge direction in the X direction 104 sides including (XZ plane) in the depth direction of the Z direction Along Curved ( saddle-shaped surface ) is being done.

[0016] The bone chisel blade 30 according to the third embodiment of the present invention is the same as the bone chisel blade 10 of the first embodiment except that it has left and right blades. 106 (In the X direction, the blade width Along It is a composition of an image that adds a curved (concave) surface.

[0017] FIG. 2 is a diagram showing the external configuration of a bone chisel 1 (equipped with a blade 10) according to a first embodiment of the present invention, a bone chisel 2 (equipped with a blade 20) according to a second embodiment, and a bone chisel 3 (equipped with a blade 30) according to a third embodiment.

[0018] With reference to FIG. 3, the configuration of the blade 10 of the bone chisel 1 according to the first embodiment of the present invention will be described in detail. The blade 10 has a blade thickness of At point d4 It has a blade opening angle of 6 degrees or less and is used to expand the width of a slit formed in bone, for example, from 0.3 mm to 1 mm. The blade 10 is inserted into the bone to a depth of, for example, about 8 mm. The cross-sectional view of the blade 10 at each point in Figure 3(c) is shown in Figure 3(d). The cross-sectional shape of the blade 10 allows the blade 10 to contact and press against the bone at four points (three or more points) at the corners of the blade 10, dispersing stress and making the bone less likely to crack. (R 1、 R 2、 R 3 ) However, compared to a flat plate, the effect is significant in that the force applied when inserting and widening the slit is not so great that it would crack the bone.

[0019] With reference to FIG. 4, the configuration of the blade 20 of the bone chisel 2 according to the second embodiment of the present invention will be described in detail. The blade 20 has a blade thickness of At point d4 It has a blade opening angle of 6 degrees or less and is used to expand the width of a slit formed in bone, for example, from 0.3 mm to 1 mm. The blade 20 is inserted into the bone to a depth of, for example, about 8 mm. Cross sections of the blade 20 at each point in Figure 4(c) are shown in Figure 4(d). Due to the cross-sectional shape of the blade 20, the blade 20 comes into contact with and presses against the bone at two points, above and below.

[0020] With reference to FIG. 5, the configuration of the blade 30 of the bone chisel 3 according to the third embodiment of the present invention will be described in detail. Blade 30 has a blade thickness of At point d4 0. 5 The blade has a width of 6 degrees or less and is used to expand the width of a slit formed in bone, for example, from 1 mm to 2 mm. The blade 30 can be inserted into the bone to a depth of, for example, about 8 mm, and can be angled up to a maximum angle of 30 degrees to cut the bone by swinging it back and forth. Cross-sectional views of the blade 30 at each point in Figure 5(c) are shown in Figure 5(d). The cross-sectional shape of the blade 30 means that the blade 30 contacts and presses the bone at four points (three or more points) at its corners, dispersing stress and making the bone less likely to crack. (R 2、 R 3 ) However, compared to a flat plate, the effect is significant in that the force applied when inserting and widening the slit is not so great that it would crack the bone.

[0021] FIG. 6 is a diagram illustrating the structure of the handle of the bone chisel according to the first to third embodiments of the present invention. If it is made of a metal such as stainless steel, it will weigh about 70g, so it may be made hollow to reduce the weight. The blade may be secured to the handle with a set screw to prevent it from slipping out or rotating. The opening in the handle may be internally threaded and capped with an externally threaded end cap.

[0022] FIG. 7 is a diagram showing modified examples of the handle structure of the bone chisel according to the first to third embodiments of the present invention. The handle may be common, but the blade may be removable and replaceable so that only the type of cutting edge (blade 10, blade 20, blade 30, blade 40, etc.) can be changed, and blades (which may be different types of blades) may be attached to both ends of the handle.

[0023] FIG. 8 is a graph showing the relationship between the insertion depth position and the load for the bone chisel 1 according to the first embodiment of the present invention and the bone chisel 2 according to the second embodiment of the present invention. The horizontal axis indicates the depth position, and the vertical axis indicates the load. With conventional bone chisels, a large force is applied at the time of initial insertion, increasing the risk of the bone cracking. With the bone chisel 1 according to the first embodiment of the present invention and the bone chisel 2 according to the second embodiment of the present invention, the blades 10 and 20 are thin and can be inserted smoothly and perpendicularly into the bone, and the force applied at the time of initial insertion is not large enough to crack the bone, and furthermore, the force applied when inserting and widening the slit is not large enough to crack the bone.

[0024] FIG. 9 is a graph showing the relationship between the insertion depth position and the load of the bone chisel 3 according to the third embodiment of the present invention. The horizontal axis shows time (seconds) and the vertical axis shows the load. This shows an example where the depth reached 8 mm in approximately 70 seconds, and then the object was rotated 14 degrees left and right. With conventional bone chisels, a large force is applied when first inserted, increasing the risk of the bone cracking. With the bone chisel 3 according to the third embodiment of the present invention, the blade 30 is thin and can be inserted smoothly and perpendicularly into the bone, and the force applied when first inserted is large enough to prevent the bone from cracking. Furthermore, the force applied when inserting and widening the slit is not large enough to crack the bone, and the force applied when cutting the bone left and right is not large enough to crack the bone.

[0025] FIG. 10 shows the external configuration of a bone chisel blade 40 according to a fourth embodiment of the present invention. The blade 40 has a shape that combines the upper half of the blade 10 and the lower half of the blade 20 described above.

[0026] According to each of the above embodiments, a bone chisel is realized in which the blade is thin and can be inserted smoothly and perpendicularly into the bone, and the force applied at the time of initial insertion is not so great that it would crack the bone, and furthermore, the force applied when inserting and widening the slit is not so great that it would crack the bone.

[0027] The above-described embodiments are preferred embodiments of the present invention, and various modifications of the shape, size, ratio, etc. are possible without departing from the spirit of the present invention. For example, a shape that combines parts of different blade shapes may be used. [Explanation of symbols]

[0028] 1, 2, 3 Bone Chisel 10, 20, 30, 40 blades

Claims

1. A bone chisel for dental implants, comprising: When the blade width direction is defined as the X direction, the blade thickness direction perpendicular to the blade width direction is defined as the Y direction, and the insertion depth direction perpendicular to the blade width direction and the blade thickness direction is defined as the Z direction, A bone chisel having a tip portion that is wedge-shaped, a side surface on the XZ plane side including the blade width direction that is concavely curved along the depth direction, and a blade that is concavely curved along the blade width direction.

2. A bone chisel as described in claim 1, having blades curved concavely along the blade width direction on both end surfaces of the X-Z plane.

3. 3. The bone chisel according to claim 1, wherein the blade is replaceable, the blade is attachable to both sides of the handle, and the handle has a hollow structure.

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