WO2015182618A1 - Foret médical - Google Patents

Foret médical Download PDF

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Publication number
WO2015182618A1
WO2015182618A1 PCT/JP2015/065130 JP2015065130W WO2015182618A1 WO 2015182618 A1 WO2015182618 A1 WO 2015182618A1 JP 2015065130 W JP2015065130 W JP 2015065130W WO 2015182618 A1 WO2015182618 A1 WO 2015182618A1
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WIPO (PCT)
Prior art keywords
drill
angle
tip
thinning
cutting edge
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PCT/JP2015/065130
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English (en)
Japanese (ja)
Inventor
高一 新井
義一 新井
勝世 木村
Original Assignee
株式会社ビック・ツール
高一 新井
義一 新井
勝世 木村
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Application filed by 株式会社ビック・ツール, 高一 新井, 義一 新井, 勝世 木村 filed Critical 株式会社ビック・ツール
Publication of WO2015182618A1 publication Critical patent/WO2015182618A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines

Definitions

  • the present invention relates to a medical drill, and more particularly to a medical drill used for drilling bones and teeth in a surgical operation or a dental operation.
  • a drill is used as a drilling instrument for embedding a medical implant, opening a skull or the like, and connecting and fixing a fracture site.
  • a drill is used as a drilling instrument for embedding a medical implant, opening a skull or the like, and connecting and fixing a fracture site.
  • the bones before and after the fracture site are drilled with a drill, and the plate is fixed by screwing bolts into the holes formed by the drilling. The place is connected with the plate.
  • the jaw bone is drilled with a drill, and the artificial tooth root is embedded and fixed in a hole formed by the drilling.
  • the function required for such a medical drill is a function required for a drill for drilling a workpiece of an industrial product such as a metal plate because the object to be drilled is a bone or a tooth constituting the human body.
  • the following functions are typically required.
  • the contact angle of the drill with respect to the surface of the drilling target (work) is usually set to approximately 90 ° (see FIG. 18).
  • the surface of the drilling target (bone or tooth) is touched because it is restricted by the shape and position of the bone or tooth to be drilled.
  • the tangent angle is shallow, for example, 30 ° or less.
  • the tip of the drill becomes slippery with respect to the surface of the drilling target, so that the tip of the drill is displaced from the point to be drilled during drilling work, and drilling is performed.
  • a metal workpiece is a drilling target
  • the drilling target when the drilling target is a bone or a tooth, the drilling target (bone or tooth) may be broken during the drilling operation. For this reason, medical drills are required to have a function capable of drilling without causing cracks in the drilled object (bone or tooth).
  • a drilling target bone or tooth
  • the bone tissue may be altered or damaged by frictional heat generated during drilling. This is not preferable because the time required for this becomes longer and the burden on the patient increases. Therefore, medical drills are required to have an excellent sharpness for smoothly drilling a drilled object (bone or tooth) in a short time.
  • Patent Document 1 As a conventional medical drill, for example, a medical drill disclosed in Patent Document 1 below is known.
  • Patent Document 1 described below sets the tip angle to 60 ° to 150 ° (see claim 1).
  • the tip angle is large, so if the drill is tilted to make the contact angle with the surface of the drilling target (bone or tooth) shallow, the tip of the drill slips and deviates from the drilling point.
  • Cheap Moreover, the contact angle cannot be set shallow due to the restriction of the tip angle. Specifically, if the contact angle is less than half of the tip angle, the outer peripheral portion hits the drilling object prior to the tip of the drill (see FIG. 19), so the contact angle cannot be set shallowly to 75 ° or less. .
  • Patent Document 1 describes that the rake angle is set to -5 ° to 40 ° (paragraph [0005]).
  • the rake angle of the drill is large (the torsion angle is also large)
  • the cutting edge bites into the object to be drilled like a wedge, so that if the object to be drilled is a bone or a tooth, it breaks. Therefore, when the rake angle is set to 40 ° in the medical drill of Patent Document 1, there is a possibility that the drilling target (bone or tooth) may be broken.
  • the medical drill of patent document 1 is not thinned at the front-end
  • the main component of bones and teeth to be drilled by medical drills is calcium phosphate, and the degree of difficulty for drilling is significantly greater than that of metal materials. Therefore, if a drill with poor sharpness is used, it will take a long time to drill the target to be drilled (bone or tooth). This increases the time required for the patient. Thus, the medical drill described in Patent Document 1 cannot satisfy the functions (characteristics) required for the medical drill described above.
  • Patent Documents 2 and 3 below disclose orthopedic drill bits.
  • the drill tip angle is set to 40 ° to 80 °, particularly about 60 ° (paragraph [0048]), and the spiral angle is set to 10 ° to 45 °, particularly about 13 ° ( Paragraph [0039] is described.
  • the drill tip angle is set to 50 ° to 80 ° or 60 ° to 80 °, particularly about 60 ° (paragraph [0030]), and the twist angle is set to 8 ° to 45 ° or 8 ° to 8 °. Setting to 20 °, in particular about 20 ° (paragraph [0023]) is described.
  • the present invention has been made to solve the above-described problems of the prior art, and the tip of the drill deviates from the point to be drilled even if the contact angle of the drill with respect to the surface of the drilling target (bone or tooth) is shallow. It is possible to drill at a precise point without any cracks in the bones and teeth, and it has excellent sharpness for smoothly drilling bones and teeth in a short time.
  • the medical drill which has is provided.
  • the invention according to claim 1 has two cutting blades formed symmetrically with respect to the rotational axis, the tip portion is thinned, and when the cutting blade is viewed from the drill tip side, the chisel edge to the outer periphery of the drill
  • a thinning cutting edge extending in a shape including a curve toward the side, and a main cutting edge extending from an end portion of the thinning cutting edge to a drill outer peripheral end, and a chip discharge groove on a thinning surface formed by the thinning cutting edge;
  • the rake angle ⁇ 1 formed by the main cutting edge and the rake angle ⁇ 2 formed by the thinning cutting edge are excluding the part immediately below the chisel. , ⁇ 1 >
  • the present invention relates to
  • the invention according to claim 2 relates to the medical drill according to claim 1, characterized in that the center of the chisel protrudes in a mountain shape on the tip side.
  • the invention according to claim 3 relates to the medical drill according to claim 2, wherein the angle of the mountain shape is 70 ° or more.
  • the invention according to claim 4 relates to the medical drill according to any one of claims 1 to 3, wherein the tip angle is 40 ° to 90 °.
  • the invention according to claim 5 relates to the medical drill according to claim 4, wherein the tip angle is 45 ° to 55 °.
  • the invention according to claim 6 relates to the medical drill according to any one of claims 1 to 5, wherein the twist angle is 15 ° to 20 °.
  • the tip angle is 30 ° to 130 °
  • the tip of the drill starts from the point to be drilled even if the contact angle of the drill with respect to the surface of the drilling target (bone or tooth) is shallow. Drilling to a precise point can be performed without shifting. Further, since the twist angle is 5 ° to 25 °, it is possible to smoothly perforate without causing cracks in the bones and teeth.
  • the ridgeline of the boundary with the chip discharge groove of the thinning surface formed by the thinning cutting edge is viewed from the front side of the drill which is the opening side of the chip discharge groove, from the drill tip side with respect to the drill axis direction It is formed in a substantially U shape that is inclined in the direction of transition from the thinning cutting edge side to the main cutting edge side as it goes to the base end side, and the rake angle ⁇ 1 formed by the main cutting edge and the thinning cutting edge
  • the formed rake angle ⁇ 2 satisfies ⁇ 1 > ⁇ 2 > 0 ° except directly under the chisel, the cutting resistance (that is, the force required for drilling) can be greatly reduced as compared with the conventional drill. It becomes possible to drill bones and teeth smoothly in a short time. Therefore, the drill satisfies all the functions (characteristics) required for the medical drill.
  • the hole can be surely easily made.
  • the tip angle is 40 ° to 90 °, specifically, even if the contact angle of the drill with respect to the surface of the drilling target (bone or tooth) is further reduced, specifically, Even when the contact angle is shallow (smaller) to about 45 °, it is possible to perform drilling to a precise point without shifting the tip of the drill from the point to be drilled.
  • the tip angle is 45 ° to 55 °, even if the contact angle of the drill with respect to the surface of the drilling target (bone or tooth) is very shallow, Even if the contact angle is shallow (small) to about 30 °, it is possible to perform drilling to an accurate point without the tip of the drill being displaced from the point to be drilled.
  • the twist angle is 15 ° to 20 °, the function of smoothly drilling without causing cracks in bones and teeth can be more reliably exhibited. It becomes possible.
  • FIG. 1 It is a figure which shows the medical drill which concerns on 1st embodiment of this invention, Comprising: (a) is a top view (figure which looked at the drill from the front end side), (b) is a front view of a front-end
  • FIG. 1A and 1B are diagrams showing a first embodiment of a medical drill according to the present invention, in which FIG. 1A is a top view (a view of the drill viewed from the tip side), and FIG. 1B is a front view of the tip portion. .
  • the medical drill according to the present invention has two cutting edges formed symmetrically with respect to the rotational axis, and the tip is thinned.
  • the cutting blade is a thinning cutting blade (1) extending in a shape including a curve from the chisel edge toward the outer periphery of the drill when viewed from the drill tip side, and a main extending from the end of the thinning cutting blade (1) to the outer periphery of the drill It consists of a cutting blade (2).
  • the main cutting edge (2) extends linearly from the end of the thinning cutting edge (1) to the outer peripheral edge of the drill, but may extend in a curved line, It may extend linearly including a curved portion. This is common to all embodiments of the present invention.
  • the chisel may be linear, or the center in the width direction of the chisel may protrude in a mountain shape on the tip side.
  • (3) is a flank
  • (4) is a chisel
  • (5) is a rake face formed by the main cutting edge (2)
  • (6) is a new rake face formed by thinning
  • (W) Is the chisel width.
  • the cutting edge length in the extending direction of the main cutting edge (2) is the length of the main cutting edge (2) (A) and the length of the thinning cutting edge (1).
  • 0 ⁇ A ⁇ B may be satisfied.
  • the chisel is linear.
  • the length (B) of the thinning cutting edge (1) may be lengthened and the length (A) of the main cutting edge (2) may be shortened. That is, A ⁇ B may be satisfied.
  • the length (A) of the main cutting edge (2) becomes 0, the surface accuracy of the drilled hole is lowered, so that 0 ⁇ A is necessary.
  • it is set so as to satisfy R ⁇ 0.1 ⁇ A with respect to the drill radius (R).
  • FIG. 2 is a view of the medical drill of the first embodiment as seen from the left slightly from the front.
  • rake angle formed by the main cutting edge (2) ( ⁇ 1), rake angle formed by the thinning cutting edge (1) ( ⁇ 2) is, ⁇ 1> ⁇ 2> 0 satisfy °.
  • ⁇ 2 ⁇ 0 ° ⁇ 2 ⁇ 0 ° close to 0 °.
  • the rake angle ( ⁇ 2 ) formed by the thinning cutting edge (1) is smaller than the rake angle ( ⁇ 1 ) formed by the main cutting edge (2). Means that it becomes smaller (relaxes).
  • the rake angle is large, the amount of the blade bites into the drilling target increases, and there is no problem when drilling a metal workpiece using a machine tool, etc., but the blade tip is manually pressed against the drilling target such as bone or tooth. In this case, human power is lost with respect to the load, and as a result, it cannot be cut.
  • the thinning cutting edge (1) so as to satisfy ⁇ 1 > ⁇ 2 , the apparent rake angle is reduced, the amount of biting into the drilling target is reduced, and the cutting edge is manually drilled ( Even when it is pressed against bone or teeth, it can be easily cut.
  • ⁇ 2 > 0 ° is that when the rake angle ( ⁇ 2 ) formed by the thinning cutting edge (1) is changed from 0 ° to minus, the cutting resistance is increased and the sharpness is worsened.
  • the conventional drill is thinned so that the rake angle becomes negative because the cutting edge is easily chipped if there is a rake at the center.
  • the medical drill according to the present invention (including the medical drills of all the embodiments) has a tip angle set in a range of 30 ° to 130 °. If the tip angle of the drill is set to be twice or less of the angle of inclination according to the angle of inclination, the entire cutting edge will not suddenly hit the bone or the like. If the tilt angle is 25 °, the tilt angle may be set to 50 ° or less, which is twice the tilt angle, for example, 40 ° to 45 °. Similarly, the tip angle may be set to 80 ° when the tilt angle is 45 °, and the tip angle may be set to 50 ° when the tilt angle is 30 °.
  • the tip angle is less than 30 °, the tip of the drill becomes an irregular shape and the sharpness is reduced. If the tip angle exceeds 130 °, the drill is tilted so as to reduce the contact angle with the surface of the drilling target (bone or tooth). Then, the tip of the drill slips and tends to be displaced from the drilling point, and there is a risk of damaging the human body (such as nerves) during drilling. In many cases, it is not preferable because it is difficult.
  • the tip angle in the range of 30 ° to 130 °, even if the contact angle of the drill with respect to the surface of the object to be drilled (bone or tooth) is reduced, specifically, the contact angle is reduced to about 65 °. Even if it is (smaller), it is possible to perform drilling to an accurate point without shifting the tip of the drill from the point to be drilled.
  • the tip angle is preferably set in the range of 40 ° to 90 °.
  • the tip angle is preferably set in the range of 40 ° to 90 °.
  • the tip angle is more preferably set in the range of 45 ° to 55 °.
  • the contact angle is specifically about 25 °. Even if it is shallow (small), it is possible to perform drilling to an accurate point without shifting the tip of the drill from the point to be drilled.
  • the optimum value of the tip angle can be 50 °, for example. In this case, as shown in FIG.
  • the twist angle is set in the range of 5 ° to 25 °.
  • the twist angle is less than 5 °, the cutting resistance increases and the sharpness decreases.
  • the twist angle exceeds 25 °, the cutting edge easily bites like a wedge with respect to the drilling target, and the drilling target (bone or tooth) breaks. In either case, there is a fear that there is a risk.
  • the twist angle is set in the range of 15 ° to 20 °.
  • the twist angle is set in the range of 15 ° to 20 °.
  • the cutting edge angle formed by the thinning cutting edge (1) (alpha 2) satisfies ⁇ 1 ⁇ 2 ⁇ 90 ° . (Refer to FIG. 8 for ⁇ 1 and ⁇ 2 )
  • the rake angle and the edge angle will be given.
  • the cutting edge angle is too sharp and the cutting edge bites into the object to be drilled like a wedge, so that the cutting resistance increases.
  • the rake angle is reduced and the edge angle is increased, thereby improving the sharpness (cutting resistance is reduced).
  • a gentle rake angle and a large cutting edge angle suitable for the operator's arm force are created.
  • the clearance angle ( ⁇ ) is set so as to satisfy 5 ° ⁇ ⁇ 30 °.
  • objects bones, teeth, etc.
  • the clearance angle ( ⁇ ) is set to 5 ° ⁇ ⁇ 30 °, the amount of biting into the drilling target is adjusted, and the cutting edge is manually pressed against the drilling target such as a bone or a tooth. Can be cut easily.
  • the clearance angle is defined by the following (A) or (B).
  • an actual clearance angle of a drill having a diameter of 10 mm and a chisel width of 2 mm polished with a grindstone having a clearance angle of 3 ° and a radius (R) of 50 mm is about 3.573 °.
  • the chisel width (W) is preferably set to be small so that it can be easily cut even when the blade edge is pressed against the object to be drilled (bone or tooth) manually. Specifically, it is preferably set to 15% or less of the drill diameter. For example, when the drill diameter ⁇ is 1 to 13 mm, the chisel width (W) is set to be increased or decreased in the range of 0.1 to 0.8 mm in accordance with the increase or decrease of the drill diameter.
  • the drill diameter ⁇ is not particularly limited, but for example, a diameter of about 1 to 6 mm is preferably used.
  • the thinning angle is set smaller than that of a conventional general drill.
  • the angle ( ⁇ ) at which the drill is applied to the grindstone at the time of thinning formation is increased.
  • the angle ( ⁇ ) is reduced as much as possible and the center of the drill is brought closer to the grinding surface tangent of the grindstone, the resistance of the portion called the web at the center of the drill is not received, so the cutting resistance is greatly reduced.
  • FIG. 8A is a view showing a cross section perpendicular to the thinning portion of the drill (a cross section taken along a line perpendicular to the line D in FIG. 1B).
  • the edge of the rake face (6) formed by thinning is the radius of the thinning ( R 2 ) is formed in an arc shape.
  • R 1 is the radius of the drill groove.
  • the main cutting edge (2) rake angle formed by the (theta 1), rake angle formed by the thinning cutting edge (1) (theta 2) is, ⁇ 1> ⁇ 2> a 0 ° Fulfill.
  • the main cutting edge angle formed by the (2) ( ⁇ 1), the cutting edge angle formed by the thinning cutting edge (1) ( ⁇ 2) satisfy the ⁇ 1 ⁇ 2 ⁇ 90 ° .
  • the edge shape of the rake face is not limited to an arc shape, and may be a shape combining an arc and a straight line. (See Figure 9)
  • the medical drill according to the present invention has a drill axis direction (C) when the ridge line at the boundary with the chip discharge groove of the thinning surface (8) formed by the thinning cutting edge (1) is viewed from the front side of the drill. It is formed in a substantially parabolic shape (substantially U-shaped) that is inclined with respect to (see FIG. 1B, FIG. 2, FIG. 10B, and FIG. 11B).
  • the “front side of the drill” refers to the opening side of the chip discharge groove.
  • the direction of the inclination is the direction of transition from the thinning cutting edge (1) side to the main cutting edge (2) side as it goes from the drill tip side to the base end side (downward diagonally downward in front view). It is.
  • the inclination angle ( ⁇ ) is set in the range of 1 ° to 25 ° (for example, 16.5 °). As described above, this angle setting is performed by setting the angle formed by the drill center axis to 1 ° to 25 ° (see FIG. 7) with respect to the center line in the width direction of the grindstone to be thinned. Can do.
  • the angle at which the center of the grindstone (see the one-dot chain line (L) in FIG. 10A) is tilted with respect to the center axis in the longitudinal direction of the drill is determined by taking into account the twist angle of the drill. It is preferable to set in the range of ° to twist angle + 10 °.
  • this angle can be set from a twist angle of -10 ° to a half of the tip angle on the cutting edge side.
  • a line extending along the deepest part (the deepest part scraped off by thinning) of the thinning surface (8) formed by the thinning cutting edge (1) is extended in the drill tip direction.
  • the extension line (D) is shifted to the heel side of the drill without intersecting with the center portion (7) of the drill tip (see FIG. 1B).
  • the deviation amount (d) is preferably within 10% of the drill diameter. This is because if it exceeds 10%, the cutting resistance increases and the sharpness decreases.
  • a rake angle is formed in the portion including the direct portion of the chisel (4) of the thinning cutting edge (1). Since the rake angle is formed in the portion including directly under the chisel (4), a portion (9) in which the width in the direction parallel to the chisel is narrower than the chisel width (W) is formed immediately under the chisel (4). ing. (See Fig. 12 (a))
  • FIG. 10A and 10B are views showing a medical drill according to a second embodiment of the present invention, in which FIG. 10A is a top view (a view of the drill viewed from the distal end side), and FIG. 10B is a front view of the distal end portion.
  • the medical drill of the second embodiment also has a substantially parabolic shape in which the thinning surface (8) formed by the thinning cutting edge (1) is inclined with respect to the drill axial direction (C) when viewed from the front side of the drill. It is formed in a (substantially U shape) (see FIG. 10B). Moreover, the chisel is linear.
  • An extension line (D) extending in the drill tip direction from a line extending along the deepest part of the thinning surface (8) formed by the thinning cutting edge (1) is the center of the drill tip ( 7) Misaligned to the cutting edge side of the drill.
  • the deviation amount (d) is preferably within 10% of the drill diameter. This is because if it exceeds 10%, the cutting resistance increases and the sharpness decreases.
  • a rake angle is formed in a portion of the thinning cutting edge (1) immediately below the chisel (4) and not including the direct bottom. More specifically, a rake angle is formed on the main cutting edge (2) side from directly below the chisel (4) of the thinning cutting edge (1).
  • the cutting edge length in the extending direction of the main cutting edge (2) is the length of the main cutting edge (2) (A) and the length of the thinning cutting edge (1).
  • A>B> 0 is satisfied.
  • rake angle formed by the main cutting edge (2) ( ⁇ 1), rake angle formed by the thinning cutting edge (1) ( ⁇ 2) is, ⁇ 1> ⁇ 2> 0 satisfy °.
  • ⁇ 2 ⁇ 0 ° ⁇ 2 ⁇ 0 ° close to 0 °).
  • FIG. 11A and 11B are views showing a medical drill according to a third embodiment of the present invention, in which FIG. 11A is a top view (a view of the drill viewed from the distal end side), and FIG. 11B is a front view of the distal end portion.
  • the medical drill of the third embodiment also has a substantially parabolic shape (substantially U) when the thinning surface formed by the thinning cutting edge (1) is inclined with respect to the drill axis direction (C) when viewed from the front side of the drill. (Refer to FIG. 11B).
  • the chisel is linear.
  • An extension line (D) extending in the drill tip direction from a line extending along the deepest part of the thinning surface (8) formed by the thinning cutting edge (1) is the center of the drill tip ( 7)
  • a rake angle is formed in a portion of the thinning cutting edge (1) immediately below the chisel (4) and not including the direct bottom. More specifically, a rake angle is formed on the main cutting edge (2) side from directly below the chisel (4) of the thinning cutting edge (1).
  • the cutting edge length in the extending direction of the main cutting edge (2) is the length of the main cutting edge (2) (A), and the length of the thinning cutting edge (1).
  • (B) A>B> 0.
  • rake angle formed by the main cutting edge (2) ( ⁇ 1), rake angle formed by the thinning cutting edge (1) ( ⁇ 2) is, ⁇ 1> ⁇ 2> 0 satisfy °.
  • ⁇ 2 ⁇ 0 ° ⁇ 2 ⁇ 0 ° close to 0 °).
  • the drill axis direction ( It is characterized by being formed in a substantially parabolic shape (substantially U-shaped) inclined with respect to C).
  • the cutting resistance can be reduced and an excellent sharpness can be obtained, which has a great effect for manual drilling work, and has an excellent sharpness for smoothly drilling bones and teeth in a short time. It becomes a drill.
  • the medical drills of the second and third embodiments both have a tip angle and a twist angle set in the same manner as the medical drill of the first embodiment, Even if the contact angle of the drill with respect to the surface of the teeth) is shallow, drilling can be performed to an accurate point without shifting the tip of the drill from the point to be drilled, and smooth without causing cracks in the bones and teeth. It becomes a medical drill which can be perforated.
  • the medical drill of the fourth embodiment differs from the medical drill of the first to third embodiments in that the center in the width direction of the chisel 4 protrudes in a mountain shape on the tip side. Specifically, as shown in FIGS. 13 and 14, the center portion of the chisel 4 in the width direction protrudes toward the tip side, and the chisel 4 viewed from the direction perpendicular to the width direction has a mountain shape.
  • the configuration is the same as that of any of the medical drills of the first to third embodiments, except that the central portion in the width direction of the chisel protrudes in a mountain shape on the tip side. .
  • the lower limit of the range of the angle ⁇ of the chisel 4 is preferably 70 °, more preferably 90 °.
  • the upper limit of the range of the angle ⁇ of the chisel 4 is 180 ° where the chisel 4 is linear, but is preferably 170 °.
  • the center of the chisel 4 in the width direction protrudes in the shape of a mountain on the tip side, so that a clear center of rotation is created, and the center can be maintained even if the drill is tilted and used for easy drilling. Can be done.
  • the tip of the chisel 4 of the chisel 4 may be flat without being sharpened as shown in FIG. 15 within a range that does not substantially affect the machinability.
  • 16 to 17 are diagrams showing examples of the shape of the grindstone, and show the rotating end portion (outer peripheral edge portion) of the grindstone.
  • the grindstone is a grindstone having one or more radii of curvature at the rotating end.
  • One of the curvature radius of the grindstone and R 1, to the R 1 primarily radius for thinning cutting edge created across the cutting edge.
  • a grindstone that combines one or more radii of curvature may also be used.
  • thinning may be performed by including a straight portion between the R portions or by inclining the side surfaces.
  • the material of the medical drill according to the present invention is not particularly limited as long as it is a material permitted by the Pharmaceutical Affairs Law, but stainless steel is preferably used, and SUS420J, SUS440C, and the like are particularly preferably used.
  • each part of the medical drill according to the present invention are not particularly limited, but as a suitable example, drill diameter: 3.2 mm, groove core thickness: 20%, twist angle: 16 °, tip angle: 50 °,
  • the clearance angle ( ⁇ ) can be set to 25 °, and the inclination angle ( ⁇ ) of the thinning surface can be set to 16.5 °.
  • Example> (Test 1) The boring femur was drilled using the drills of the examples and comparative examples. Two medical drills (made of stainless steel) with an outer diameter of 3.2 mm are prepared, one with the above-described thinning (A1: Example 1) and one with a new one (B1: Comparative Example 1). ), A hole was made perpendicular to each bone. The new state of B1 was a linear chisel shape that was not thinned. The tip angle was 90 ° as it was new.
  • A1 Example 1
  • B1 Comparative Example 1
  • Smoke was clearly observed during drilling.
  • the measured cutting resistance is shown in FIG. A1 (Example 1) had a cutting resistance smaller than B1 (Comparative Example 1), and was about 1/2.
  • Test 2 The feeling of use in which drills A1 and B1 in Test 1 were used (drilled) by five workers is shown below.
  • each bovine femur is drilled by one hole each using a drill of A1 and B1.
  • a cordless electric drill driver manufactured by Panasonic was used, and the drills were drilled in a direction substantially perpendicular to the femur of the cow.
  • the results are shown in Table 2.
  • piercing location of drill A1, B1 was randomly performed with respect to the femur of a cow, in order to eliminate the difference in use conditions, it performed so that the distance between A1, B1 might become the shortest.
  • each drill A1, B1 was performed using only one, it seems that there was not a little influence by the wear of the drill depending on the order of use.
  • ⁇ Cut well and do not feel much resistance. Power is not required. ⁇ : It cuts well, but requires a little force. ⁇ : Cannot be cut unless power is applied. ⁇ : It was difficult to cut even if force was applied.
  • FIG. 24 shows an appearance photograph of A4 (Example 4).
  • the cow's femur was fixed so that the surface of the femur was horizontal, and the inclination was increased in the order of 60 °, 45 °, 30 °, and 25 ° from the horizontal.
  • the five types of drills of Examples A2, A3, A4, and A5 and the two types of Comparative Examples of B2 and B3 one hole was drilled on the femur of the cow. All of the examples had thinning, and all of the comparative examples were drills without thinning. Further, the five types of drills of the examples of A2, A3, A4, and A5 were changed only in the angle of the mountain. For drilling, a Panasonic cordless electric drill driver was used.
  • ⁇ The tip could not be slipped and the hole was easily drilled at the target position in an inclined state.
  • ⁇ When the drill was rotated while concentrating the force on the tip of the drill, the hole could be drilled without slipping.
  • ⁇ 1 The tip does not slip, but it is difficult to cut even if force is applied.
  • ⁇ 2 A state in which there is a hole while sliding. Difficult to drill the desired hole.
  • X The tip slides and cannot be drilled.
  • Test 4 In the drill where the center of the chisel protrudes in the shape of a chevron on the tip side, the optimum angle between the tip angle and the twist angle was investigated.
  • a medical drill with a drill diameter of 3.2 mm, with a crest angle of 128 °, a tip angle of 38 °, 40 °, 60 °, 90 °, 100 °, and a twist angle of 3 °, 4 °, 5 °, 10 °
  • the bovine femur was drilled perpendicularly with a drill with 15 °, 25 °, 26 ° and 28 ° changes.
  • the main cutting edge length, the thinning cutting edge length, the main cutting edge rake angle ( ⁇ 1 ), and the thinning cutting edge rake angle ( ⁇ 2 ) vary depending on the tip angle and the twist angle, but ⁇ 1 > ⁇ 2 > Each dimension was adjusted to satisfy the condition of 0 °.
  • Table 5 shows the dimensions when the twist angle is 15 °.
  • the equipment and conditions used were the same as in Test 1 described above.
  • the results of the sharpness of each drill are shown in Table 6. In Table 6, the blank condition is not implemented.
  • ⁇ The tip slips and falls from the bone and does not break ⁇ : Not cut, but very difficult to cut ⁇ : Cuts well ⁇ : Cuts very well —: Cutting edge is difficult Tip angle is 40 ° to 90 ° Thus, the sharpness is good when the twist angle is in the range of 5 ° to 25 °.
  • Test 5 With the medical drill used in Test 4 tilted in the same manner as in Test 3, holes were drilled in the femur of the cow in the direction along the tilt angle (arrow direction). Since the inclination angle is 1 ⁇ 2 of the tip angle, [(tip angle ⁇ 1 ⁇ 2) + 5 °] was set, and it was investigated whether or not cutting was possible without slipping the tip.
  • the results of biting each drill are shown in Table 7, and the results of sharpness are shown in Table 8. In the table, blank conditions are not implemented.
  • ⁇ Does not slip, but does not break, so the position of the tip shifts when force is applied. ⁇ : Does not slip, allows subsequent cutting ⁇ : Slip and fall
  • Test 6 The machinability of the drill in which the tip of the chisel chevron is flat without being pointed as shown in FIG. 15 was examined. As shown in FIG. 25, the chisel width was divided into three equal parts with a drill having a crest angle of 120 °, and the central portion was flattened. The tip angle and torsion angle were as shown in Table 9, and the other conditions were the same as in the drill of Test 4. Table 9 shows the results of the sharpness of each drill when a hole was drilled perpendicularly to the femur of the cow. In the state where the drill was tilted in the same manner as in Test 3, the direction of the cow toward the direction along the tilt angle (arrow direction) was shown. Table 10 shows the results of biting and sharpness when the femur was drilled.
  • Test 7 The machinability of a drill with a flat chisel center that did not protrude in the shape of a chevron was investigated.
  • the tip angle and the twist angle were as shown in Table 11, and the other conditions were the same as those of the drill of Test 4.
  • Table 11 shows the result of the sharpness of each drill when a hole was drilled perpendicularly to the femur of the cow. In the state of being tilted in the same manner as in Test 3, the cow's femur was directed in the direction along the tilt angle (arrow direction).
  • Table 12 shows the results of biting and sharpness when the femur was drilled.
  • the medical drill according to the present invention is suitably used for drilling work in fracture treatment, implant treatment, horizontal impacted tooth treatment, etc., for drilling bones and teeth in surgery and dental surgery in orthopedics and brain surgery.

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  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
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  • Drilling Tools (AREA)

Abstract

La présente invention concerne un foret médical comprenant : une lame de coupe amincie (1) ayant deux lames de coupe symétriques autour d'un axe de rotation de celles-ci, un amincissement étant effectué au niveau d'une partie d'extrémité de celle-ci, et la lame de coupe s'étendant en une forme comprenant une ligne incurvée à partir d'un bord de ciseau vers la périphérie externe du foret ; et une lame de coupe principale (2) s'étendant d'une partie d'extrémité de la lame de coupe amincie à une extrémité périphérique externe du foret ; une nervure d'une limite avec une rainure d'évacuation de copeaux dans une surface d'amincissement étant sensiblement en forme de U et constituant la transition de la lame de coupe amincie à la lame de coupe principale progressivement d'un côté pointe à un côté extrémité proximale du foret par rapport à la direction de l'axe du foret vu depuis l'avant du foret, qui est le côté d'ouverture de la rainure, l'angle de coupe (θ1) de la lame de coupe principale et l'angle de coupe (θ2) de la lame de coupe aminci satisfaisant à l'expression θ1 > θ2 > 0°, sauf directement sous le ciseau, l'angle de pointe étant de 30° à 130°, et l'angle de vol étant de 5° à 25 °
PCT/JP2015/065130 2014-05-26 2015-05-26 Foret médical WO2015182618A1 (fr)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6132377B1 (ja) * 2016-06-08 2017-05-24 株式会社ビック・ツール 歯科用ドリル及び該歯科用ドリルを用いた歯科インプラント埋込のための穿孔方法
WO2017222011A1 (fr) * 2016-06-22 2017-12-28 株式会社東鋼 Foret
CN107744401A (zh) * 2017-11-14 2018-03-02 北京水木天蓬医疗技术有限公司 超声骨刀刀头
JP2018108223A (ja) * 2016-12-28 2018-07-12 株式会社ビック・ツール 医療用ドリル
DE102018120240A1 (de) * 2018-05-30 2019-12-05 Anton Hipp GmbH, Chir.Instrumente Medizinisches, spanabhebendes werkzeug und werkzeugset mit solchen medizinischen, spanabhebenden werkzeugen zur erzeugung von knochenspänen, die für die transplantation geeignet sind
CN110801299A (zh) * 2019-12-09 2020-02-18 华中科技大学同济医学院附属协和医院 一种确定深度的颅骨缺损模型造模设备及其方法

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JPS60120712U (ja) * 1984-01-25 1985-08-15 住友電気工業株式会社 ドリル
JP2001347410A (ja) * 2000-04-04 2001-12-18 満雅 ▲真▼鍋 ツイストドリル刃先
JP2002200510A (ja) * 2000-12-27 2002-07-16 Tsutomu Fuma ドリル
JP2012192514A (ja) * 2011-03-03 2012-10-11 Big Tool Co Ltd ドリル

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60120712U (ja) * 1984-01-25 1985-08-15 住友電気工業株式会社 ドリル
JP2001347410A (ja) * 2000-04-04 2001-12-18 満雅 ▲真▼鍋 ツイストドリル刃先
JP2002200510A (ja) * 2000-12-27 2002-07-16 Tsutomu Fuma ドリル
JP2012192514A (ja) * 2011-03-03 2012-10-11 Big Tool Co Ltd ドリル

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6132377B1 (ja) * 2016-06-08 2017-05-24 株式会社ビック・ツール 歯科用ドリル及び該歯科用ドリルを用いた歯科インプラント埋込のための穿孔方法
WO2017222011A1 (fr) * 2016-06-22 2017-12-28 株式会社東鋼 Foret
JPWO2017222011A1 (ja) * 2016-06-22 2018-08-02 株式会社東鋼 ドリル
US10589364B2 (en) 2016-06-22 2020-03-17 Toko Co., Ltd. Drill
JP2018108223A (ja) * 2016-12-28 2018-07-12 株式会社ビック・ツール 医療用ドリル
CN107744401A (zh) * 2017-11-14 2018-03-02 北京水木天蓬医疗技术有限公司 超声骨刀刀头
CN107744401B (zh) * 2017-11-14 2024-05-07 北京水木天蓬医疗技术有限公司 超声骨刀刀头
DE102018120240A1 (de) * 2018-05-30 2019-12-05 Anton Hipp GmbH, Chir.Instrumente Medizinisches, spanabhebendes werkzeug und werkzeugset mit solchen medizinischen, spanabhebenden werkzeugen zur erzeugung von knochenspänen, die für die transplantation geeignet sind
CN110801299A (zh) * 2019-12-09 2020-02-18 华中科技大学同济医学院附属协和医院 一种确定深度的颅骨缺损模型造模设备及其方法
CN110801299B (zh) * 2019-12-09 2024-02-27 华中科技大学同济医学院附属协和医院 一种确定深度的颅骨缺损模型造模设备及其方法

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