JP2014151083A - Ultrasonic treatment instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ultrasonic treatment instrument capable of sufficiently cooling a probe without getting large in size.SOLUTION: An ultrasonic treatment instrument includes: plural piezoelectric elements that generate ultrasonic oscillations; a resonance unit that amplifies the ultrasonic oscillations generated by the plural piezoelectric elements; and a control unit that controls the oscillations of the plural piezoelectric elements. The control unit encompasses a treatment mode in which the resonance unit is longitudinally oscillated, and a cooling mode in which the resonance unit is cooled by generating lateral oscillations which cause the resonance unit to be oscillated in a direction perpendicular to the direction of the longitudinal oscillation, and driving the distal end part of the resonance unit in the form of a fan.

Description

  The present invention relates to an ultrasonic treatment instrument having a function for cooling a probe.

  A treatment method using an ultrasonic treatment device is known. In general, an ultrasonic treatment instrument is composed of a handpiece part and a probe which is an ultrasonic vibration transmission member. An ultrasonic vibrator is incorporated in the handpiece part, and the generated ultrasonic vibration is amplified by a horn and a probe is used. To communicate.

  This probe gives ultrasonic vibration by bringing its tip into contact with a living tissue, a calculus, or the like, and performs treatment such as excision, emulsification, or crushing with the vibration energy. Further, the excised or crushed tissue or calculus is sucked and removed by an absorption pump through a suction passage formed through the probe or the handpiece.

  Generally, such an ultrasonic treatment device generates heat by ultrasonic vibration. For this reason, in order to maintain the appropriate temperature of the ultrasonic treatment instrument, for example, in Patent Document 1, water supply means for supplying cooling water to the probe, and water supply means corresponding to the ultrasonic output set value of the ultrasonic transducer And a control means for suppressing the heat generation of the probe.

JP-A-6-38973

  The ultrasonic treatment device described above is used in an optimal state because the probe is cooled by securing the necessary water supply amount so that the probe does not exceed the specified temperature at the start of use and during use. It is possible to carry out easy operation and reliable operation of the apparatus. However, in order to ensure the cooling of the probe, at least the water supply means and the control means are indispensable and cannot be simply configured, which is one factor that hinders the realization of downsizing of the ultrasonic treatment instrument itself. .

  Accordingly, an object of the present invention is to provide an ultrasonic treatment instrument that can sufficiently cool a probe without increasing its size.

In order to solve the above problems, an ultrasonic treatment device according to an aspect of an embodiment includes a plurality of piezoelectric elements that oscillate ultrasonic vibrations, a resonance unit that amplifies ultrasonic vibrations oscillated by the plurality of piezoelectric elements, and And a control unit that controls oscillation of the plurality of piezoelectric elements. The control unit generates a treatment mode in which the resonance unit is longitudinally vibrated and a transverse vibration in which the resonance unit vibrates in a direction perpendicular to the direction of the longitudinal vibration, and drives the tip of the resonance unit in a fan shape to cool the resonance unit. And a cooling mode.
In one aspect described above, an ultrasonic treatment instrument that can sufficiently cool the probe without increasing its size is provided.

  The ultrasonic treatment instrument of the invention has an effect that the probe can be sufficiently cooled without increasing its size.

FIG. 1 is a schematic diagram of the ultrasonic treatment apparatus according to the first embodiment. FIG. 2 is a schematic diagram showing the configuration of the ultrasonic transducer. FIG. 3 is a diagram illustrating a configuration of a resonator of the ultrasonic treatment device according to the first embodiment. FIG. 4 is a diagram showing a waveform when an in-phase alternating voltage is applied to the first and second piezoelectric elements. FIG. 5A is a diagram illustrating a vibration movement of the resonance unit 20 when an in-phase alternating voltage is applied to the first and second piezoelectric elements. FIG. 5B is a diagram illustrating a vibration movement of the resonance unit 20 when an in-phase alternating voltage is applied to the first and second piezoelectric elements. FIG. 5C is a diagram illustrating a vibration movement of the resonance unit 20 when an in-phase alternating voltage is applied to the first and second piezoelectric elements. FIG. 6 is a diagram illustrating a waveform when an antiphase alternating voltage is applied to the first and second piezoelectric elements. FIG. 7A is a diagram illustrating a vibration movement of the resonance unit 20 when an antiphase alternating voltage is applied to the first and second piezoelectric elements. FIG. 7B is a diagram illustrating a vibration movement of the resonance unit 20 when an antiphase alternating voltage is applied to the first and second piezoelectric elements. FIG. 8 is a block diagram illustrating a flow of driving the ultrasonic treatment apparatus according to the first embodiment. FIG. 9 is a perspective view of a resonance unit according to a modification. FIG. 10 is a top view of a resonance unit according to a modification. FIG. 11A is a diagram illustrating cooling mode driving of a resonance unit according to a modification. FIG. 11B is a diagram illustrating cooling mode driving of the resonance unit according to the modification.

In this embodiment, one aspect will be described with reference to the drawings.
FIG. 1 is a schematic diagram of an ultrasonic treatment instrument 1 according to the first embodiment. As shown in FIG. 1, the ultrasonic treatment instrument 1 includes an ultrasonic transducer 2, a handle unit 3 that connects a proximal end portion to the ultrasonic transducer 2, and extends from the distal end portion of the handle unit 3 along the longitudinal axis. And a switch unit 49 for sending a control signal to the power supply unit (control unit) 7. In the ultrasonic transducer 2, a power cable 6 is pulled out from the side opposite to the side attached to the handle unit 3 and connected to a power supply unit (control unit) 7 by a connector, and driving power is supplied.

  Further, the probe 21 is a part of a resonance unit 20 described later. The probe 21 has a distal end portion 28 that is a portion to be treated by contacting the living tissue or the like at the distal end portion. In the following, along the longitudinal axis, the probe 21 side is the front end side, and the ultrasonic transducer 2 side is the rear end side.

  The handle unit 3 includes a case 11 and a grip portion 13 provided on the case 11. For example, as shown in FIG. 1, the gripping unit 13 may include a fixed handle that is fixed to the case 11 integrally and a movable handle that is movable relative to the fixed handle.

  As shown in FIG. 1, for example, a switch portion 49 is provided on the distal end side of the grip portion 13 of the handle unit 3. In the present embodiment, for example, a push button switch (momentary switch) is used as the switch unit 49 and is electrically connected to the power supply unit (control unit) 7 via a wiring cable (not shown). ing.

  The switch unit 49 sends a control signal such as a trigger signal generated by pressing to the power supply unit (control unit) 7, and receives the control signal from the power supply unit (control unit) 7 to provide an AC power supply having a predetermined current value. Is supplied to the ultrasonic transducer 2. In addition, the switch unit 49 can be set to send a control signal for supplying a driving power source having an arbitrary phase shift from the power source unit (control unit) 7 (in this embodiment, the reverse phase is taken as an example). is there. In this case, a changeover switch or a plurality of dedicated switches may be arranged.

  FIG. 2 is a diagram showing the configuration of the ultrasonic transducer 2. As shown in FIG. 2, the ultrasonic transducer 2 is provided with a transducer case 12 and a resonator 20 provided inside the transducer case 12. The ultrasonic transducer 2 is inserted into the handle unit 3 from the base end direction, and is detachably attached to the case 11 of the handle unit 3.

  FIG. 3 is a diagram illustrating a configuration of the resonator 20. The resonator 20 is installed on the probe 21 and a proximal end side of the probe 21, and a horn 22 that is a resonator that amplifies ultrasonic vibrations (oscillated by first and second piezoelectric elements 25 and 26 described later). The first piezoelectric element, which is an ultrasonic transducer that oscillates ultrasonic vibrations when current is supplied from the ultrasonic vibration transmitting unit 23 provided on the proximal end side of the horn 22 and the power supply unit (control unit) 7 25 and the second piezoelectric element 26, and a back mass 27 for fixing the ultrasonic vibration transmitting portion 23.

  In the power supply unit (control unit) 7 of the present embodiment, the first and second piezoelectric elements 25 and 26 are supplied with a drive power supply (AC power supply) composed of voltages having opposite phases. However, if the phase shift is an anti-phase (πred) described later, vibration having the largest amplitude is obtained, but it is not particularly limited and can be set as appropriate. The power supply unit (control unit) 7 is also integrated with a control unit that controls the drive voltage supplied to the first and second piezoelectric elements 25 and 26. The control unit may be provided separately from the power supply unit 7.

  The probe 21 is attached to the distal end side of the horn 22 inside the ultrasonic transducer 2 and extends from the distal end side of the handle unit 3. During the treatment, the tip portion 28 of the probe 21 vibrates ultrasonically in a state of being in contact with a living tissue such as a blood vessel, thereby generating frictional heat between the tip portion of the probe 21 and the living tissue. Coagulation and incision of the living tissue is performed at the tip of the probe 21 by the generated frictional heat. Note that the tip of the probe 21 may be provided with a jaw for gripping the living tissue. Further, the probe 21 and the jaw can rotate about the longitudinal axis with respect to the case 11.

  The ultrasonic vibration transmission unit 23 has a cylindrical shape, and is formed of, for example, a metal member. The ultrasonic transmission unit 23 has a distal end fitted to the proximal end side of the horn 22 and is integrally fixed by a back mass 27 from the proximal end side. The ultrasonic vibration transmission unit 23, the horn 22, the back mass 27, and the probe 21 may be integrally formed. The ultrasonic vibration transmitting portion 23 is formed with two groove portions 24A and 24B at radially opposed positions on the peripheral side surface, and the first and second piezoelectric elements 25 and 26 are mounted in the groove portions 24A and 24B. ing. With this arrangement, the two first piezoelectric elements 25 and the second piezoelectric elements 26 are configured to face each other with the central axis of the ultrasonic vibration transmitting unit 23 interposed therebetween. The first and second piezoelectric elements 25 and 26 are connected to the power supply unit (control unit) 7 by wires (not shown) bundled in the power cable 6.

As described above, the piezoelectric elements 25 and 26 are operated by operating the switch unit 49 to be supplied with the driving voltage having the same phase or the opposite phase from the power supply unit (control unit) 7 and generate ultrasonic vibration.
In addition, each of the first and second piezoelectric elements 25 and 26 is housed and mounted in the groove portions 24A and 24B. For this reason, the first and second piezoelectric elements 25 and 26 and the resonance unit 20 vibrate as a unit, and therefore have the same resonance frequency. Each of the first and second piezoelectric elements 25 and 26 generates ultrasonic vibrations in one direction by being applied with an electric charge, for example, generates vibrations in a direction parallel to the longitudinal axis. In the present embodiment, when the first and second piezoelectric elements 25 and 26 are vibrated, the switch unit 49 is different from the power supply unit (control unit) 7 in the same phase driving power source and in a different phase (reverse phase). The first and second piezoelectric elements 25 and 26 perform longitudinal vibration or lateral vibration (flexural vibration) by instructing switching to the driving power source.

Hereinafter, the longitudinal vibration and the lateral vibration will be described.
FIG. 4 shows a waveform when an in-phase AC voltage is applied to the first and second piezoelectric elements 25 and 26. 5A, 5B, and 5C show the vibration state of the resonance unit 20 when an in-phase AC voltage is applied to the first and second piezoelectric elements 25 and 26. FIG.

  As shown in FIG. 5, when an in-phase AC voltage serving as a driving power source is applied to the first and second piezoelectric elements 25 and 26, the first and second piezoelectric elements 25 and 26 have the same phase. Then, the longitudinal vibration mode is excited by the same frequency and electric charge, and the resonance unit 20 performs longitudinal vibration as shown in FIGS. 5A to 5C. At this time, the position of the no-vibration node is fixed in the longitudinal vibration of the resonance unit 20. For example, the resonating unit 20 vibrates such that a vibration node is located at the base end of the horn 22.

  The operator brings the distal end portion 28 of the distal end of the probe 21 that vibrates longitudinally into contact with the living tissue, and performs a desired treatment such as peeling, anastomosis, and joining. In the following description, the state in which the resonating unit 20 vibrates longitudinally is referred to as a treatment mode.

  FIG. 6 shows a waveform when an AC voltage having an opposite phase is applied to the first and second piezoelectric elements 25 and 26. FIG. 7A and FIG. 7B show the vibration state of the resonance unit 20 when an AC voltage having an opposite phase is applied to the first and second piezoelectric elements 25 and 26.

  As shown in FIG. 6, when an alternating voltage of opposite phase is applied to the first and second piezoelectric elements 25, 26, the first and second piezoelectric elements 25, 26 are the same in opposite phase. The transverse vibration mode is excited by the frequency and the charge, and the resonating unit 20 performs transverse vibration that is a vibration in a direction perpendicular to the vibration direction of the longitudinal vibration, as shown in FIGS. 7A to 7B. At this time, the position of the node of the transverse vibration of the resonance unit 20 is the same as that of the longitudinal vibration at a predetermined position, for example, the base end of the horn 22. Therefore, the resonance part 20 has the same position of the vibration node at a predetermined position in the longitudinal vibration and the lateral vibration. The resonating unit 20 diffuses heat from the surface to the outside by ultrasonic vibration. Accordingly, the resonating unit 20 is cooled by lateral vibration. For example, the tip portion 28 is driven in a fan shape (at a high speed) due to the lateral vibration of the resonance unit 20, and therefore the entire probe 21 is laterally vibrated (at a high speed). . Hereinafter, a state in which the resonance unit 20 vibrates laterally is referred to as a cooling mode. The resonance unit 20 is different in the treatment mode and the cooling mode in that the phase of the AC voltage supplied to the first and second piezoelectric elements 25 and 26 is different between the same phase and the opposite phase, and longitudinal vibration and lateral vibration. The (resonance) frequency is also different. Further, in the resonance part 20, the first and second piezoelectric elements 25 and 26 housed in the groove parts 24A and 24B have the same vibration node positions at predetermined positions in the treatment mode and the cooling mode, respectively. It is provided to be.

With reference to FIG. 8, the treatment / cooling process by the ultrasonic treatment instrument 1 of the present embodiment will be described below.
First, when the switch unit 49 is turned on, the power supply unit 7 supplies an alternating voltage having the same phase to the first and second piezoelectric elements (step S1). With this power supply, the ultrasonic vibration generated by the piezoelectric elements 25 and 26 is transmitted to the tip of the probe 21 through the horn 22 and the probe 21 along the longitudinal axis.

  The treatment is started by bringing the tip portion 28 of the probe 21 that vibrates ultrasonically into contact with the treatment target site (step S2). When the treatment is completed (step S3), the switch unit 49 is turned off to stop energization of the in-phase AC voltage supplied to the first and second piezoelectric elements, and the treatment mode is finished. (Step S4).

  Immediately after the end of the treatment mode, the first and second piezoelectric elements are energized with opposite phase AC voltages by turning on the switch unit 49 (step S5), and the vibration in the cooling mode as described above is performed. To start cooling (step S6). When the temperature of the distal end portion 28 has cooled to a predetermined temperature after the predetermined time has elapsed, the cooling mode is ended by turning off the switch portion 49 (step S7).

As in the treatment mode, the switch unit 49 is turned off to stop energization of reverse-phase AC voltages supplied to the first and second piezoelectric elements, and the treatment mode is terminated (step S8).
Thereafter, whether to continue the treatment is selected. If the treatment is continued, the process returns to step S1, and if the treatment is not continued, the process is terminated (step S9).

  In this embodiment, a temperature sensor for measuring the temperature of the tip portion 28 is provided to measure the temperature of the tip portion. When the measured temperature exceeds a predetermined temperature, a warning is given to the user and the measurement is performed. When the temperature falls below a predetermined temperature, the switch unit 49 may be automatically turned off to control the end of cooling.

  According to the present embodiment, the ultrasonic treatment instrument 1 can be selectively driven into a treatment mode and a cooling mode by a switch operation. In the cooling mode, the resonator 20 is subjected to ultrasonic vibration by lateral vibration, and the tip 28 is driven in a fan shape at high speed to effectively dissipate the surrounding air and cool to a predetermined temperature. . Moreover, since the ultrasonic treatment tool 1 of this embodiment does not need to add a new component, it can have a cooling function without increasing in size.

  In the present embodiment, the first and second piezoelectric elements 25 and 26 attached to the grooves 24A and 24B of the ultrasonic transmission unit 23 are used. However, longitudinal vibration and lateral vibration can be generated, and Other vibrators may be used as long as the longitudinal vibration and the transverse vibration can be driven at different frequencies. For example, a plurality of piezoelectric elements may be used instead of two, or a Langevin type vibrator separated into two may be used.

A modification of the first embodiment will be described.
The modification of the first embodiment has a configuration substantially equivalent to that of the ultrasonic treatment instrument 1 of the first embodiment, but the configuration of the probe 21 is different. Therefore, the same components as those of the ultrasonic treatment instrument 1 of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 9 is a perspective view of a resonance unit 20 according to a modification. FIG. 10 is a top view of the resonance unit 20 of the modification.
In the ultrasonic treatment device 1 of the modified example, fins 31 serving as air passages are formed in the probe 21 of the resonating unit 20. The fins 31 are a plurality of grooves formed through the probe 21 in one direction on the side surface of the probe 21. The fin 31 is formed at a predetermined position on the proximal end side of the distal end portion 28 of the probe 21.

  11A and 11B show driving in the cooling mode of the resonance unit 20 of the modification. As shown in FIGS. 11A and 11B, a plurality of fins 31 that are parallel to the vibration direction of the lateral vibration are formed on the probe 21 excluding the portion that contacts the treatment target, and the heat dissipation area of the probe 21 To increase the heat dissipation effect. In this modification, the fin 31 is formed so that a plurality of concave grooves are arranged on the peripheral side surface of the probe 21, and the diameter of the probe 21 is not increased.

  In the treatment mode, an in-phase AC voltage is applied to the first and second piezoelectric elements 25 and 26, and treatment is performed on the target site at the tip portion where the fin 31 of the tip portion 28 is formed.

  Further, in the cooling mode, the first and second piezoelectric elements 25 and 26 are applied with an AC voltage of opposite phase to cause lateral vibration so that air flows in the direction in which the fins 31 are arranged. Yes. According to the modification, by disposing a plurality of fins 31 on the probe 21, the heat radiation area is increased to increase the cooling efficiency, the temperature rise during the treatment mode is moderated, and in the cooling mode, the temperature is increased in a short time. A reduction can be realized.

  DESCRIPTION OF SYMBOLS 1 ... Ultrasonic treatment tool, 2 ... Ultrasonic transducer, 3 ... Handle unit, 6 ... Power supply cable, 7 ... Power supply unit (control part), 11 ... Case, 12 ... Vibrator case, 13 ... Gripping part, 20 ... Resonance , 21 ... probe, 22 ... horn, 23 ... ultrasonic vibration transmission part, 24A, 24B ... groove part, 25, 26 ... piezoelectric element, 27 ... back mass, 28 ... tip part, 31 ... fin, 49 ... switch part.

Claims (5)

A plurality of piezoelectric elements that oscillate ultrasonic vibration; a resonance unit that amplifies ultrasonic vibrations oscillated by the plurality of piezoelectric elements; and a control unit that controls oscillation of the plurality of piezoelectric elements.
The control unit generates a treatment mode for longitudinally vibrating the resonance unit and a transverse vibration that vibrates the resonance unit in a direction perpendicular to the direction of the longitudinal vibration, and drives the tip of the resonance unit in a fan shape to An ultrasonic treatment device comprising: a cooling mode for cooling.   The ultrasonic treatment tool according to claim 1, wherein the plurality of piezoelectric elements are arranged to face each other so as to excite the treatment mode and the cooling mode.   The ultrasonic treatment device according to claim 1, wherein resonance frequencies of the treatment mode and the cooling mode are different.   2. The ultrasonic treatment device according to claim 1, wherein the resonance unit is provided with the plurality of piezoelectric elements so that the positions of vibration nodes are the same at predetermined positions in the treatment mode and the cooling mode.   The ultrasonic treatment instrument according to claim 1, wherein fins are formed in a portion other than the tip of the resonance part.

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