JPH0542810Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a medical hollow drill for cutting teeth, bones, hardened tissues, etc., and the invention is related to a medical hollow drill that cuts teeth, bones, hardened tissues, etc. The aim is to remove it without scattering it to the surrounding area.

Conventional technology Conventionally, in medical drills that cut teeth, bones, hardened tissues, etc., in order to ensure the visibility of the working part during the cutting operation, a means for removing cutting dust generated during the cutting operation was used. It is used.

As this method, there is a method in which a suction nozzle connected to a suction means is positioned facing the part to be cut, in addition to the medical drill, and the cutting dust is sucked. However, this method has the drawback that in addition to the cutting work using a medical drill, suction work using a suction nozzle must be performed at the same time, and an assistant is required.

Another method for removing cutting dust from the part to be cut is to form a lead-out path close to the cutting tool, and to draw water, compressed air, etc. from this lead-out path to blow away and remove the cutting dust. Are known. However, since this method removes cutting dust from the cut part by extracting water, compressed air, etc., it has the disadvantage that the cutting dust scatters and contaminates the area around the cut part, which is difficult to perform in precision surgery. It was completely unusable.

Problems to be Solved by the Invention This invention attempts to solve the above-mentioned problems, and aims to remove the cutting dust generated by the cutting work from the rotating shaft of the cutting blade without scattering it to the surroundings. By concentrating on suction and removal, it is possible to easily ensure the visibility of the part to be cut.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a chuck case that is rotated by an electric motor, in which a cutting tool is removably attached, and the cutting operation is carried out in the axial direction of the cutting tool. At the same time, a plurality of cutting blades are formed at regular intervals in a radial manner in the cutting part of the cutting tool, with the advancing angle being at the outermost periphery in the rotation direction, and the outermost periphery of the cutting blade is A cutting powder guiding surface is formed in the direction of the discharge path, and a suction means is connected to the discharge path connected to the outermost peripheral portion via this guiding surface.

Function Since the present invention is constructed as described above, in order to perform cutting work on teeth, bones, hardened tissues, etc., the cutting blade of the cutting tool rotated by an electric motor is
Contact with the part to be cut, such as teeth, bone, hardened tissue, etc.
The part to be cut can be cut by the contact of the rotating cutting blade. Since this cutting blade has an advancing angle at the outermost peripheral part in the rotational direction, the cutting blade gradually contacts the part to be cut from the outer peripheral part to the inner peripheral part and performs the cutting operation. The cutting dust generated by this cutting work is removed because the cutting blade forms a guiding surface for the cutting dust from the outermost periphery in the direction of the discharge path.
It moves along the guiding surface and concentrates on the central axis position of the cutting blade. Since the discharge passage formed to penetrate in the axial direction of the cutting tool is connected to the suction means, the cutting dust concentrated at the central axis position of the cutting blade is discharged and removed to the outside via the discharge passage.

As described above, since the cutting powder generated during the cutting operation does not accumulate on the cut part, the visibility of the cut part can always be ensured, and safe and accurate cutting work becomes possible. Further, this discharge and removal of cutting powder does not scatter cutting powder around the cutting blade, so it can also be used in precision surgeries and the like.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a casing which pivotally supports a chuck case 5 at the center in the axial direction via bearings 2, 3, and 4.
Further, an electric motor 6 such as a brushless motor is installed on the outer periphery of the chuck case 5 to enable the chuck case 5 to rotate. This chuck case 5 forms an inner circumferential tapered surface 7 whose inner circumference in the distal direction has a larger diameter, and a chuck 8 is slidably inserted therein, and an outer circumferential tapered surface 9 is provided at the distal end of the chuck 8. is a taper corresponding to the inner peripheral tapered surface 7 of the chuck case 5. This chuck 8 is provided with a groove (not shown) in the axial direction from the tip, and the chuck case 5 is
When retracted inward, the diameter of the chuck 8 is reduced to enable the cutting tool 12 to be fastened.

Also, connect the rear end of the chuck 8 to the joint shaft 1.
This joint shaft 13 is connected and fixed to one end of 3.
An engaging step portion 14 is formed protruding from the outer periphery in the rear end direction. A fastening spring 15 is interposed between the engagement step 14 and the chuck case 5, and the chuck 8 is pressed and biased in the direction of retraction into the chuck case 5 via the joint shaft 13, thereby tightening the chuck 8. It is possible to wear it.

In addition, a settling ring 1 is attached to the outer periphery of the casing 1.
6 is rotatably glued, and an eccentric sliding groove 17 is formed in the casing 1 at the position where the settling ring 16 is attached. Then, the pressing rod 18 fixed to the settling ring 16 is inserted into the sliding groove 17.
The pressing rod 18 is inserted into the casing 1 through the joint shaft 13, and is positioned so as to face the pressing collar 19 protruding from the outer periphery of the joint shaft 13, so that the joint shaft 13 can be pressed in the direction of contraction of the fastening spring 15. There is. Then, by the rotation of the pressing rod 18 in conjunction with the rotation of the settling ring 16, the pressing collar 19 is pressed, and the chuck 8 is pushed through the joint shaft 13.
It is pressed in the direction of detachment from the chuck case 5, weakens the pressure bond between the inner circumferential tapered surface 7 and the outer circumferential tapered surface 9, releases the fastening of the chuck 8 by the chuck case 5, and enables the cutting tool 12 to be detached.

In addition, a discharge path 21 for cutting powder produced during cutting is formed in the axial center of the cutting tool 12, and the discharge path 21 is connected to the casing 1 via a communication path 22 that passes through the joint shaft 13 in the axial direction.
It is connected to an outlet 24 formed in the cap 23 of the machine, and is connected to a suction means (not shown) such as a vacuum pump through an outlet pipe 25 connected to the outlet 24 to suction and remove cutting powder. It is possible.

Also, a cutting tool 1 protruding from the casing 1
A cutting part 26 is provided at the tip of the cutting part 2.
6, four cutting blades 27 are formed radially at regular intervals. This cutting blade 27 has an advancing angle at the outermost circumference 28 in the rotation direction, and has a contact surface 2 with the outermost circumference 28 as the tip at a position where it contacts the cut part.
9 is provided, and this contact surface 29 is tapered to be inclined in the direction of the discharge path 21 of the cutting tool 12. Further, the cutting blade 27 has a cutting powder guiding surface 31 formed from the outermost peripheral portion 28 toward the discharge path 21 so as to be parallel to the axial direction of the cutting tool 12, and this guiding surface 31 is formed as a concave surface.

In the structure as described above, teeth, bones,
In order to perform cutting work on hardened tissue, etc., the electric motor 6
The cutting blade 27 of the cutting tool 12 rotates by,
Contact with the part to be cut, such as teeth, bone, hardened tissue, etc.
This contact of the rotating cutting blade 27 allows the part to be cut to be cut. The cutting blade 27 has a forward angle at the outermost circumference 28 in the rotation direction and a contact surface 29 at the cutting edge, so the cutting blade 27 gradually contacts the cut part from the outer circumference to the inner circumference. It is possible to perform good cutting work with good sharpness. In addition, the cutting blade 27 is
Since a cutting dust guiding surface 31 is formed in the direction from the cutting blade 8 to the discharge path 21, the cutting dust generated by the cutting operation moves along the guiding surface 31 and concentrates at the rotation axis position of the cutting blade 27. Since the discharge passage 21 formed through the cutting tool 12 in the axial direction is connected to the suction means, the cutting powder concentrated in the discharge passage 21 in the central axis direction of the cutting blade 27 is transferred to the outside through the discharge passage 21. is discharged and removed.

Effects of the invention Since the present invention is constructed as described above, the cutting dust generated by cutting teeth, bones, hardened tissues, etc. is not accumulated in the cut part but is suctioned out from the discharge path and is constantly removed. Visibility of the part to be cut can be ensured, allowing safe and accurate cutting work.

Further, the discharge and removal of cutting powder does not scatter the cutting powder around the part to be cut, so the area around the part to be cut is not contaminated, and can be used in precision surgery.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention,
1 is a sectional view, FIG. 2 is an enlarged half-sectional view of the cutting part, FIG. 3 is a left side view of FIG. 2, and FIG. 4 is a perspective view of the cutting part. 6...Electric motor, 8...Chuck, 12...Cutting tool, 21...Discharge path, 26...Cutting part, 27...
... Cutting blade, 28 ... Outermost periphery, 31 ... Guide surface.

Claims (1)

[Scope of utility model registration request] A cutting tool is removably attached to a chuck that is rotated by an electric motor. A discharge passage for discharge of cutting powder generated by cutting work is formed in the axial direction of the cutting tool.
A plurality of cutting blades are formed radially at regular intervals, with the outermost periphery of the cutting blade having a forward angle in the rotation direction, and a guide surface for shavings is formed from the outermost periphery of the cutting blade toward the discharge passage,
The medical hollow drill is characterized in that a suction means is connected to a discharge passage which is connected to the outermost peripheral portion via this guide surface.