Bone surgical drill

Abstract

To provide a bone surgical drill that facilitates surgery and improves accuracy of bone surgery at the time of bone surgery.SOLUTION: Provided is a bone surgery drill for a human or other animals, the bone surgery drill including a base part and a blade part. The blade part includes a cutting blade part including three to six cutting blades, and a distal end portion including a distal end blade. An angle of the distal end angle of the distal end blade is less than 90°. Each of the three to six cutting blades is arranged in a spiral shape in an outer peripheral surface of the cutting blade part.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a drill for bone surgery, which can facilitate bone surgery by reducing the number of steps that have been required up to now, and can also improve the accuracy of bone surgery. [Background technology]

[0002] Bone drills are used in bone surgery, such as cutting bones and modifying the shape of holes in bones, in humans and other animals (Patent Document 1). Bone drills consist of a base for mounting to a handpiece and a blade part with a blade for cutting or drilling bones. By rotating the cutter, the blade of the blade part cuts or drills the bone. In bone surgery, the general procedure for the drill step in surgery to create an implant site for implanting an artificial tooth root into a human jawbone is to first create a shallow depression in the jawbone using a round-tipped drill called a round bur. Then, using this depression as a starting point, a bone drill is used to create an implant site for the artificial tooth root. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-228510 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, especially when drilling holes in bone, it is necessary to gradually widen the diameter of the drilled hole by using multiple drills with different diameters or tip shapes. This procedure requires many steps, such as changing the drill. In addition, the use of a round burr can make the diameter of the recess too large, making it difficult to see the center. Even if a round burr is used, when the part to be embedded is sloped, the drill can slip, resulting in deviation from the intended embedding position and embedding angle. Therefore, the object of the present invention is to solve the problems during bone surgery as described above, specifically to provide a drill that can facilitate bone surgery (e.g., reduce the number of steps required) and improve the accuracy of bone surgery. [Means for solving the problem]

[0005] The present inventors have conducted extensive research into bone surgery drills and have found that the above problems can be solved by a bone surgery drill having 3 to 6 cutting edges and a tip edge, the tip edge angle of which is less than 90°, and each of the 3 to 6 cutting edges is arranged in a spiral shape on the outer circumferential surface of the cutting edge portion. The present invention is based on these findings. Thus, the present invention provides [1] A bone surgery drill for humans or other animals, comprising a base and a cutting edge, The blade portion includes a cutting portion having 3 to 6 cutting edges and a tip portion having a tip edge, The tip angle of the tip cutting edge is less than 90°, and The bone surgery drill, wherein each of the three to six cutting edges is arranged in a spiral shape on an outer circumferential surface of a cutting edge portion. [2] The bone surgery drill according to [1], wherein the tip angle of the tip cutting edge is 20° to 60°. [3] The bone surgery drill according to [1] or [2], wherein the number of cutting edges is 3. [4] The bone surgery drill according to [3], wherein the tip cutting edge has three tip surfaces and three contact edges on the outer circumferential surface of the tip cutting edge. [5] Each of the three to six cutting edges is arranged symmetrically about the rotation axis on the outer circumferential surface of the cutting edge portion, and The bone surgery drill according to any one of [1] to [4], wherein each of the three to six cutting edges is connected to a tip edge; and [6] A bone surgery drill according to any one of [1] to [5], which is used for forming an implantation site for implanting an artificial dental root in a human jawbone. Regarding. Effect of the Invention

[0006] According to the present invention, it is possible to facilitate bone surgery by reducing the number of steps required during bone surgery, etc. Also, according to the present invention, it is possible to improve the accuracy of bone surgery. [Brief description of the drawings]

[0007] [Figure 1] FIG. 2 is a top view of one embodiment of the bone surgery drill of the present invention. [Diagram 2] 1 is a perspective view of an embodiment of a bone surgical drill of the present invention, the tip angle of which is illustrated; [Diagram 3] 1 is a perspective view of an embodiment of a bone surgical drill of the present invention, the tip angle of which is illustrated; [Figure 4] FIG. 2 is a diagram showing the helix angle of the bone surgical drill of the present invention. [Diagram 5] 1 is a close-up view of a top view of one embodiment of the bone surgical drill of the present invention, showing the corners due to the protrusions of the bone surgical drill of the present invention; [Figure 6] FIG. 2 is a right side view of one embodiment of the bone surgery drill of the present invention. [Figure 7] FIG. 2 is a bottom view of one embodiment of the bone surgery drill of the present invention. [Figure 8] 1A and 1B are front and rear views of one embodiment of the bone surgical drill of the present invention. [Figure 9] FIG. 1 is a perspective view of one embodiment of the bone surgery drill of the present invention. [Figure 10] 10 is a perspective view of the embodiment of the bone surgical drill shown in FIG. 9 from another angle. [Figure 11] 11 is a perspective view of the embodiment of the bone surgical drill shown in FIG. 10 from another angle.

[0008] The bone surgery drill of the present invention will be described below with reference to the drawings. However, the drawings and the description are merely illustrative of preferred embodiments and are not intended to limit the scope of the technical concept of the present invention. In describing the bone surgical drill of the present invention and each of the components that make it up, the side closer to the base in the longitudinal direction of the bone surgical drill may be referred to as the base side, and the side closer to the tip having the tip cutting edge may be referred to as the tip side. In this specification, unless otherwise specified, the expression "A to B" for a numerical value A and a numerical value B is equivalent to "A or more and B or less." In other words, the expression "A to B" includes the numerical values ​​A and B at both ends. In such an expression, when a unit is added only to the numerical value B, the unit is also applied to the numerical value A.

[0009] The bone surgery drill 1 of the present invention comprises a base portion 2 and a cutting portion 3, the cutting portion 3 comprising a cutting portion 4 having three to six cutting edges 6 and a tip portion 5 having a tip edge 7, the tip angle α of the tip edge being less than 90°, and each of the three to six cutting edges 6 being arranged in a spiral shape on the outer circumferential surface of the cutting portion 4.

[0010] The bone surgery drill 1 of the present invention has a tip angle of less than 90°. Therefore, even if the part forming the implantation part is inclined, deviation from the expected implantation position and implantation angle can be prevented. In addition, the bone surgery drill of the present invention has a tip angle of less than 90° and a cutting edge part having 3 to 6 cutting edges, so that after forming a recess at the surgical site, the drill can be rotated to cut the bone without replacing the blade. In other words, the tip angle of the tip edge of the tip edge is less than 90° and the cutting edge part has 3 to 6 cutting edges, so that there is no need to frequently replace the drill during bone surgery.

[0011] The bone surgery drill of the present invention comprises a base portion 2 and a cutting edge portion 3. The base portion 2 is a portion for attachment to an instrument and for gripping by a surgeon. The blade portion 3 may be provided with one or more markings 9. By providing the markings 9, it becomes easier to grasp the depth of the depression formed by perforation.

[0012] The blade portion 3 includes a cutting portion 4 having a cutting edge 6 and a tip portion 5 having a tip edge 7. The number of cutting edges 6 is 3 to 6, 3 to 5, 3 to 4, or 3. By having 3 to 6 cutting edges 6, the durability of the cutting edge portion of the bone surgical drill 1 is improved compared to when the number of cutting edges is 1 to 2. In addition, by having an odd number of cutting edges 6, i.e., 3 or 5, it is possible to prevent vibration from occurring during cutting or drilling. This is because the cutting edges 6 are not located diagonally. In other words, by having an odd number of cutting edges 6, the tip of the bone surgical drill is less likely to slip from the cutting portion. Therefore, by having an odd number of cutting edges 6, i.e., 3 or 5, it is possible to further improve the accuracy of bone surgery. Each of the cutting edges 6 is arranged in a spiral shape on the outer circumferential surface of the cutting portion 4. The tip edge 7 is present on the outer circumferential surface of the tip portion 5. The tip edge 7 has a structure in which 3 to 6, 3 to 5, 3 to 4, or 3 tip surfaces 10 are connected to each other on the tip side of the tip portion 5. Each of the cutting edges 6 may be connected to the tip edge 7, specifically, to each tip surface 10, in the cutting portion 4. The number of cutting edges 6 is preferably the same as the number of tip surfaces 10. Each of the spiral cutting edges 6 is disposed starting from the base side of the blade portion 3 toward the tip side. Each of the end points of the spiral cutting edges 6 overlaps with the tip edge 7 in the longitudinal direction of the bone surgery drill (see the dashed arrows indicated by reference numbers 4 and 5 in FIG. 1), and preferably each of the spiral cutting edges 6 and the tip edge are connected. Preferably, each of the portions where the tip edge 7 is connected to each of the cutting edges 6 is bent from the tip edge 7 to each of the cutting edges 6 in a direction approaching the central axis 13 of the bone surgery drill 1.

[0013] The helical angle β of the cutting blade 6 is, for example, 5° to 60°, 10° to 45°, 10° to 30°, or 15° to 30°. The helical angle β of the cutting blade 6 is an angle formed by the cutting blade 6 arranged in a helical shape and a straight line parallel to the longitudinal axis direction of the bone surgery drill. When the helical angle β of the cutting blade 6 is 5° to 60°, the operation of cutting or drilling the bone becomes easy. The helical angles β of the three to six cutting blades 6 may be the same or different, but are preferably the same.

[0014] A protrusion 8 is disposed on each of the spiral cutting edges 6. The provision of the protrusions 8 allows the direction of the bone surgical drill to be corrected. "Correcting the direction of the bone surgical drill" means moving the bone surgical drill while keeping the tip of the bone surgical drill fixed in place. When the direction of the bone surgical drill is corrected, the trajectory of the cutting edge 3 of the bone surgical drill becomes fan-shaped. When the direction of the bone surgical drill can be corrected, it becomes easy to correct the drilling angle. The protrusion 8 is preferably disposed so as to form a spiral away from the central axis of the bone surgical drill 1 and to approach the central axis while forming an angle γ. The angle γ formed by the protrusion 8 is, for example, 30° to 120°, 45° to 105°, or 45° to 90°. It is preferable that the cutting blade 6 has a sawtooth structure as a whole by disposing the protrusions 8 over the entirety of each cutting blade 6. For example, 5 to 20, 7 to 15, or 10 to 13 protrusions 8 are disposed while the spiral cutting blade 6 goes around the cutting blade portion 4. Each of the helical cutting edges 6 is preferably arranged rotationally symmetrically about the central axis.

[0015] In the tip portion 5, the portion where the tip faces 10 contact each other forms a contact edge 14. The tip angle α of the tip edge 7 is the angle formed by the two contact edges 14. When one or both of the lines formed by the contact edges 14 are curved, the line for forming the tip angle α is the line between the apex 11 on the tip side and the end point 12 of the connection between the tip faces 10. The tip edge 7 preferably has three tip faces 10 and three contact edges 14. "The angle of the tip angle of the tip blade is less than 90°" means that at least one of the angles of the multiple angles formed by the contact blades 14 is less than 90°. It is preferable that all of the angles of the multiple angles formed by the contact blades 14 are less than 90°. In the case where there are three cutting blades 6 and three tip faces 10, "the angle of the tip angle of the tip blade is less than 90°" means that at least one of the angles of the combination of angles α1, α2, and α3 formed by the contact blades 14 is less than 90°. In the case where there are three cutting blades 6 and three tip faces 10, it is preferable that all of the angles of the combination of angles α1, α2, and α3 formed by the contact blades 14 are less than 90°. "The angle of the tip angle of the tip edge is less than 90°" similarly means that at least one of the angles α1, α2, α3, α4, α5, and α6 (not shown) is less than 90° when four cutting edges 6 are arranged and four tip faces 10 are arranged. When four cutting edges 6 are arranged and four tip faces 10 are arranged, it is preferable that all of the angles α1, α2, α3, α4, α5, and α6 (not shown) formed by the combinations of the angles between the contact edges 14 are less than 90°. The tip angles α may be the same or different. The tip surface 10 may be a flat surface or a curved surface.

[0016] The tip angle α of the tip blade 7 is, for example, less than 90°, 15° to less than 90°, 20° to 75°, 25° to 60°, or 25° to 45°. When the tip angle α of the tip blade 7 is less than 90°, even if the part for forming the embedding part is inclined, deviation from the intended embedding position and embedding angle can be prevented. The tip blade 7 is preferably in the shape of a triangular pyramid. The tip blade 7 is not in the shape of a spiral.

[0017] The bone surgical drill 1 of the present invention may have a constant thickness or may have a tapered shape (a shape that becomes thinner toward the tip side). The total length of the bone surgery drill 1 of the present invention, including the base portion 2 and the cutting edge portion 3, is, for example, 4 to 50 mm, 6 to 45 mm, 8 to 42 mm, 10 to 40 mm, 15 to 40 mm, or 20 to 40 mm, but is not limited to the following. The length of the cutting edge 3 of the bone surgery drill 1 of the present invention is, but is not limited to, for example, 3 to 40 mm, 5 to 35 mm, 8 to 30 mm, 10 to 28 mm, or 15 to 25 mm. The diameter of the cutting edge 3 of the bone surgery drill 1 of the present invention is, but is not limited to, for example, 0.5 to 5 mm, 0.8 to 4 mm, 1.0 to 3 mm, or 1.2 to 2.5 mm.

[0018] Figures 10 and 11 are diagrams more clearly illustrating the structure of one embodiment of the bone surgical drill 1 of the present invention. The embodiment of the bone surgical drill 1 of the present invention shown in Figures 10 and 11 is the same as the embodiment of the bone surgical drill 1 of the present invention shown in Figures 1 to 9.

[0019] The bone surgery drill 1 of the present invention can be used for bone surgery on humans or other animals. Examples of other animals include, but are not limited to, monkeys, dogs, cats, goats, sheep, pigs, cows, guinea pigs, rabbits, mice, and rats. The bone surgery drill 1 of the present invention is preferably for use on humans, and more preferably for use in forming an implantation site for implanting an artificial tooth root into a human jawbone. [Industrial Applicability]

[0020] According to the present invention, bone surgery can be made easier by, for example, reducing the number of steps required, and the precision of bone surgery can be improved. [Explanation of symbols]

[0021] 1 Bone surgery drill 2 base 3 Blade part 4 Cutting edge 5 Tip 6 Cutting edge 7 Tip Blade 8 Protrusion 9. Marking 10 Tip surface 11 Tip side apex 12 End point of connection between the tip surfaces 10 13 Central axis 14 Contact blade 15 Blade diameter

Claims

1. A bone surgery drill for humans or other animals, comprising a base and a cutting edge, The blade portion includes a cutting portion having 3 to 6 cutting edges and a tip portion having a tip edge, The tip angle of the tip cutting edge is less than 90°, and The bone surgery drill, wherein each of the three to six cutting edges is arranged in a spiral shape on the outer circumferential surface of the cutting edge portion.

2. 2. The bone surgery drill according to claim 1, wherein the tip angle of the tip cutting edge is 20° to 60°.

3. 3. The bone surgery drill according to claim 1 or 2, wherein the number of cutting edges is three.

4. 4. The bone surgical drill of claim 3, wherein the tip edge comprises three tip faces and three contact edges on an outer periphery of the tip edge.

5. Each of the three to six cutting edges is arranged symmetrically about the rotation axis on the outer circumferential surface of the cutting edge portion, and 3. The bone surgery drill according to claim 1, wherein each of the three to six cutting edges is connected to the tip edge.

6. 3. The bone surgery drill according to claim 1, which is used to form an implantation site for implanting an artificial dental root in a human jawbone.

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