JP6618497B2 - Handpiece type high frequency vibration cutting machine - Google Patents

Description

  The present invention relates to a high-frequency vibration type cutting apparatus that can efficiently remove an object by propagating high-frequency vibrations to a cutting tool or a cutting tool attached to a handpiece.

  The applicant of the present application improves the cutting efficiency by providing a sufficient amount of liquid on the cutting surface and reducing the thermal effect applied to the spindle, the grindstone shaft, or the fastening portion thereof, and processing accuracy. There has been proposed a high-frequency vibration excision device capable of improving the above (see Patent Document 1).

JP2015-058480A

  However, when the target object is a hard biological tissue such as a bone, it is necessary to avoid alteration or damage due to the temperature rise of other biological tissues at the excision site and the surrounding region.

  Therefore, the present invention provides a handpiece type high-frequency vibration cutting device capable of improving the excision efficiency of a hard biological tissue while suppressing the alteration or damage of the biological tissue at the excision site and its peripheral site. Objective.

The handpiece type high-frequency vibration cutting device of the present invention includes a rotation drive device, a vibration device attached to an output shaft of the rotation drive device, and a rear end portion attached to the vibration device. The spindle is rotated around an axis common to the output shaft by controlling the operations of the spindle, the tool provided at the tip of the spindle, the vibration exciting device, and the rotation driving device. A handpiece type high-frequency vibration type cutting device comprising a control device that moves and vibrates in the direction of the axis , further comprising an input interface for allowing a user to input the tool type, The control device controls the vibration frequency f of the spindle by the vibration device in a range of 20 to 60 [kHz], and the speed by the rotary drive device. The rotational speed v of the dollar is controlled in the range of 50 to 1000 [rpm], and, according to another type of the tool which is input through the input interface, the combination aspect of the oscillation frequency f and the rotational speed v of the spindle It is characterized by adjusting .

  According to the handpiece type high-frequency vibration type cutting device of the present invention, it is possible to suppress the alteration or damage of the biological tissue at the excision site and its peripheral site while improving the excision efficiency of the hard biological tissue.

Explanatory drawing regarding the structure of the handpiece type | mold high frequency vibration type cutting device as one Embodiment of this invention. Explanatory drawing (Example) regarding the trace left on a target object resulting from the micro unevenness | corrugation of a tool. Explanatory drawing regarding the trace left on a target object resulting from the micro unevenness | corrugation of a tool (comparative example).

(Constitution)
A handpiece type high-frequency vibration cutting device as an embodiment of the present invention shown in FIG. 1 includes a substantially cylindrical housing 10, a spindle 11, a tool 12, and a control device 20 that constitute a handpiece. The vibration device 21 and the electric motor 22 (rotary drive device) are provided.

  The housing 10 is designed to have a size that can be held by a normal person with one hand. The handpiece of the high-frequency vibration type cutting device is configured by the housing 10 and the constituent elements such as the spindle 11 at least partially disposed in the internal space thereof, but the handpiece is reduced in weight for ease of handling. From the viewpoint, the type and specification of the component may be appropriately selected.

  The spindle 11 has a rear end attached to the vibration device 21 and is rotatably supported by the housing 10 through bearings 112 and 114 fixed to the inner wall of the housing 10. The spindle 11 has a function as a horn that increases the amplitude. The tool 12 is detachably attached to the tip portion of the spindle 11. The size of the tool 12 in the direction perpendicular to the axial direction of the spindle 11 is included in the range of 1 to 10 [mm] or 2 to 5 [mm], for example. As the shape of the tool 12, an arbitrary shape such as a substantially cylindrical shape, a bowl shape, a bent or curved rod shape, or the like is employed.

  The vibration device 21 is attached to the output shaft 222 of the electric motor 22 and is constituted by a piezoelectric element disposed in the internal space of the housing 10. The vibration device 21 vibrates or reciprocates the spindle 11 in its axial direction. Electric power is supplied to the vibration exciter 21 through the cable 24 attached to the rear end of the housing 10 and the slip ring 212 arranged in the internal space of the housing 10. The electric motor 22 is composed of an ultrasonic motor disposed in the internal space of the housing 10, and drives the spindle 11 to rotate about an axis common to the output shaft 222. Electric power is supplied to the electric motor 22 through the cable 24.

  Since the electric motor 22 and the spindle 11 are arranged so that their respective axes are common and are separated from each other in the axial direction, the axes are arranged in parallel or apart from each other. As compared with the above, the space occupied by the electric motor 22 and the spindle 11 in the internal space of the housing 10 in the direction perpendicular to the axis, and thus the housing 10 can be made compact. As a result, the high-frequency vibration cutting device can be configured as a handpiece that is improved in ease of holding and operability.

  Since the rotational driving force of the electric motor 22 is directly transmitted to the spindle 11 without using a transmission mechanism using a gear or the like, a lubricant such as grease generally used for the transmission mechanism is unnecessary. Become. Therefore, when the high-frequency vibration type cutting device as a medical device is sterilized by high-pressure steam, a situation in which contamination of the medical device due to the presence of the lubricant occurs is avoided.

  The control device 20 controls the operations of the vibration device 21 and the electric motor 22. Although the microcomputer or the processor constituting the control device 20 is arranged and displayed outside the housing 10 in FIG. 1, it is arranged in the internal space of the housing 10 together with the substrate on which it is mounted. The control device 20 performs control so that the vibration frequency f of the spindle 11 in the axial direction by the vibration device 21 is included in the range of 20 to 60 [kHz], and the rotational speed of the spindle 11 around the axis of the spindle 11 by the electric motor 22. Control is performed so that v is included in the range of 50 to 1000 [rpm]. It is more preferable that f = 25 to 35 [kHz] and v = 200 to 500 [rpm].

(Function and effect)
According to the handpiece type high-frequency vibration cutting device having the above-described configuration, the spindle 11 is provided at the tip of the spindle 11 by being reciprocally driven in the axial direction and rotationally driven about the axis. The object is cut by the tool 12. Thereby, the minute traces remaining on the object due to the minute irregularities of the tool 12 are mixed with a plurality of waveforms such as a sine wave as shown in FIG. 2A. For this reason, the situation where the micro convex part of the tool 12 traces the same trace is avoided. Further, since the sliding of the blade is suppressed in cutting the material having anisotropy expressed by the collagen fine fibers in the bone tissue, the tissue damage due to the frictional heat with the tool 12 is also suppressed. Furthermore, the number of intersections of the traces can be increased. Each of the vibration frequency f and the rotational speed v of the spindle 11 is determined from such a viewpoint.

  On the other hand, when the spindle 11 is simply driven to rotate around the axis, the trace is in a state where a plurality of straight lines are arranged in parallel as shown in FIG. 2B. For this reason, since the minute convex part of the tool 12 traces the same trace, and the increase of the intersection part of the said trace is not aimed at, the approach to the structure | tissue which a tool blade edge excises does not occur easily.

  Therefore, according to the high-frequency vibration type cutting device, it is possible to suppress the alteration or damage of the biological tissue at the excision site and its peripheral site while improving the excision efficiency of the hard biological tissue.

(Other embodiments of the present invention)
The high-frequency vibration type cutting device further includes an input interface for allowing the user to input the type of the tool 12, and the control device 20 determines the vibration frequency f of the spindle 11 according to the type of the tool input through the input interface. The combination mode of the rotation speed v may be adjusted. For example, the input interface includes, for example, a keyboard, a touch panel type button, an operation button, or the like.

DESCRIPTION OF SYMBOLS 10 ... Housing, 11 ... Spindle, 12 ... Tool, 20 ... Control device, 21 ... Excitation device, 22 ... Electric motor (rotation drive device).

Claims (1)

A rotational drive device;
A vibration exciter attached to the output shaft of the rotary drive device;
A spindle having a rear end attached to the vibration device;
A tool provided at the tip of the spindle;
A control device that rotates the spindle around an axis common to the output shaft and vibrates in the direction of the axis by controlling the operations of the vibration exciting device and the rotation driving device; It is a handpiece type high frequency vibration cutting device equipped,
An input interface for allowing a user to input the tool type;
The control device controls the vibration frequency f of the spindle by the vibration device to be in a range of 20 to 60 [kHz], and the rotation speed v of the spindle by the rotary drive device is 50 to 1000 [rpm]. A handpiece type high-frequency vibration type characterized in that the combination mode of the vibration frequency f and the rotational speed v of the spindle is adjusted according to the type of the tool controlled through a range and input through the input interface. Cutting equipment.