JP6112911B2 - Cavitation generator - Google Patents

Description

  The present invention relates to a cavitation generator that generates cavitation.

In general, a liposuction method is known as a method for sucking and removing unwanted accumulation of body fat.
As this liposuction method, a fat removal device is disclosed in Patent Document 1, for example. In this fat removal, the deep needle includes an irrigation sleeve and a housing containing a piezoelectric crystal transducer that generates ultrasonic vibrations. The irrigation sleeve has a hollow insert. The irrigation sleeve injects irrigation solution directly into the deep needle tip. The irrigation sleeve provides a local flow of irrigation fluid to the body cavity from which the fat has been removed. The irrigation sleeve snaps onto the deep needle and can be easily removed.

  Inside this conversion device, a hollow insert having a deep needle tip is screw-engaged with a predetermined portion. The tip of this deep needle is changed according to the nature of the liposuction method. For this reason, the deep needle tip has several shapes so that it can be selected according to the nature of the suction method. Of these shapes, the standard shaped deep needle tip is closed at one end and has a single elongated suction orifice. The standard-shaped deep needle tip is a bullet-like tip. A part of one end of the tip of the bullet-like deep needle is open. Further, this bullet-shaped deep needle tip is used for most affected areas. The partially opened tip of this end portion is used for removing fat by inserting it into a local area such as a region around a small internal appendage organ.

  Such fat removal devices generate local heat via frictional contact and physically melt the thin layer surrounding the fatty tissue. Furthermore, this fat removal device emulsifies the separated / molten fat layer by supplying the irrigation solution, and sucks the emulsified solution.

JP-A-1-262854

The fat removal device described above can quickly and reliably remove unwanted adipose tissue.
However, an apparatus having an ultrasonic vibration source as described in Patent Document 1 has a large number of parts and a complicated configuration in order to apply a bolted Langevin vibrator and a horn structure. For this reason, there exists a subject that an apparatus enlarges. Moreover, in order to apply the heat | fever by ultrasonic vibration, there also exists a subject that it cannot be used in the place which dislikes heat.
Accordingly, an object of the present invention is to provide a cavitation generator that can be reduced in size, does not require heat treatment, and can easily remove fat with high efficiency.

In order to solve the above-described problem, a cavitation generating apparatus according to one aspect of an embodiment includes a first pipe portion provided inside a first flow path that circulates a medium in which cavitation occurs, and the first a second flow path flow path at a predetermined portion of the tube portion is formed thinner than the pipe diameter of the surrounding, a vibration generator for generating a pre-Symbol cavitation, Ruki Yabiteshon to act on the object cavitation said generated And an action part, wherein the vibration generating part vibrates the second flow path to vary the pressure and generate cavitation .

  In one aspect described above, it is an object of the present invention to provide a cavitation generator that can be reduced in size, does not require heat treatment, and can easily remove fat with high efficiency.

  The cavitation generator of the present invention can be miniaturized and can easily and efficiently remove fat without heat treatment.

FIG. 1 is a schematic diagram of a cavitation generating apparatus according to a first embodiment. FIG. 2A is a state diagram showing the relationship between the pressure of the cavitation acting part and the saturated vapor pressure P1 when there is no second pipe part. FIG. 2B is a state diagram illustrating a relationship between the pressure of the cavitation acting unit and the saturated vapor pressure according to the first embodiment. FIG. 3A is a diagram showing pressure fluctuations in the cavitation acting part when there is no second pipe part. FIG. 3B is a diagram showing pressure fluctuations in the cavitation acting part of the first embodiment. FIG. 4A is a schematic diagram of the cavitation generating apparatus of the second embodiment. FIG. 4B is a schematic diagram of a cavitation generating apparatus according to a second embodiment having a plurality of vibration generating sources and a cavitation acting unit. FIG. 5A is a schematic view of the cavitation generator of the second embodiment housed in the cylindrical case 6. FIG. 5B is a schematic view of the cavitation generating apparatus according to the second embodiment having a plurality of vibration generating sources and cavitation acting portions housed in the cylindrical case 6. FIG. 6A is a schematic view of the second cavitation generating apparatus 1 in which the second pipe portion and the cavitation acting portion are installed at the tip end portion of the cylindrical case 6. FIG. 6B is a schematic view of the second cavitation generating apparatus 1 in which the second pipe portion and the cavitation acting portion are installed at the tip end portion of the cylindrical case 6. 6C is a cross-sectional view taken along a line CC in FIG. 6B. FIG. 7A is a perspective view of the cavitation generating apparatus of the third embodiment. FIG. 7B is a longitudinal sectional view of the cavitation generator of the third embodiment. FIG. 7C is a perspective view of a cavitation generating apparatus according to a modification of the third embodiment. FIG. 8A is a cross-sectional view of the cavitation generator of the fourth embodiment. 8B is a cross-sectional view taken along a line DD in FIG. 8A. 8C is a cross-sectional view taken along section EE of FIG. 8A. FIG. 9A is a schematic diagram of a cavitation generating apparatus according to a fourth embodiment in which a horn and a vibration generation source are formed so that a cross section is elliptical. FIG. 9B is a schematic view of the cavitation generating apparatus of the fourth embodiment in which the horn and the vibration generation source are formed so that the cross section is elliptical. FIG. 9C is a schematic view of the cavitation generator of the fourth embodiment in which the horn and the vibration generation source are formed so that the cross section is elliptical. FIG. 10A is a schematic diagram of a cavitation generating apparatus according to a fifth embodiment. FIG. 11A is a schematic diagram of a cavitation generating apparatus according to a sixth embodiment. FIG. 11B is a schematic diagram of the cavitation generating apparatus of the sixth embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[First Embodiment]
FIG. 1 is a schematic diagram of a cavitation generating apparatus 1 according to the first embodiment.
The cavitation generator 1 which is a fat removing device of the present embodiment includes a first pipe part 2 to which a fluid is supplied from a fluid supply source (not shown), and a first position at a predetermined position of the first pipe part 2. The second pipe part 3 in which a flow path having a smaller diameter than the pipe part is formed, the vibration generating source 8 installed on the outer side surface of the second pipe part 3, and the vibration generating source in the second pipe part 3 8 and a cavitation acting part 5 formed at a position opposite to the installation position. Here, the predetermined position is, for example, a part of the first tube portion 3 that is in contact with a target for which cavitation is to be generated. As shown in FIG. 1, the cross section AA is a cross section of the first tube portion 2, and the cross section BB is a cross section of the second tube portion 3. In the following, the upstream of the fluid flow, for example, the pressure of the first pipe portion 2 is P ₀ , the flow velocity is V _0, and the flow path having a smaller diameter than the surroundings, for example, the pressure of the second pipe portion 3 is P _{0. '} And the flow rate is V _0' .

  In the first pipe portion 2, the outer wall surrounds the inner flow path. The first pipe portion 2 is supplied from a fluid supply source (not shown), and passes a fluid, for example, a liquid, which is a medium in which cavitation occurs, through an inner channel (first channel). The first tube portion 2 further has a portion where the flow path is formed narrower than the surrounding tube diameter at a predetermined portion. A portion of the first pipe portion 2 in which the flow path is formed with a diameter smaller than that of the surrounding will be referred to as a second pipe portion 3 (second flow path) below. The 2nd pipe part 3 may be the structure connected or joined to the predetermined part of the 1st pipe part 2 continuously. The 1st pipe part 2 and the 2nd pipe part 3 are applied also as the suction | inhalation conduit | pipe which inhales the attracted | sucked target object, for example, fat. At this time, an accommodation section (not shown) that accommodates a sucked substance may be provided downstream of the first pipe section 2.

The vibration generating source 8 is installed in the vicinity of the second pipe portion 3 and causes the cavitation acting portion 5 to generate a periodic pressure fluctuation. The vibration source 8 is, for example, an ultrasonic vibrator.
The cavitation acting part 5 is formed at a position facing the installation position of the vibration generating source 8 in the second pipe part 3. The cavitation acting unit 5 changes the pressure in the second flow path due to the vibration generated by the vibration generating source 8 and periodically reaches a pressure (negative pressure) lower than the saturated vapor pressure. Phenomenon). For this reason, a shock wave due to the collapse of cavitation acts at the cavitation acting part 5. Therefore, the cavitation generating apparatus 1 can be removed by pulverizing and emulsifying the adipose tissue with the cavitation action unit 5 when the cavitation action unit 5 is brought into contact with the target portion 80, for example, adipose tissue.

  2A, 2B, 3A, and 3B are diagrams showing the principle of the cavitation generating apparatus 1. FIG. FIG. 2A is a state diagram showing the relationship between the pressure of the cavitation acting part 5 and the saturated vapor pressure P1 when the second pipe part 3 is not provided. FIG. 2B is a state diagram showing the relationship between the pressure of the cavitation acting unit 5 and the saturated vapor pressure P1 of the present embodiment. FIG. 3A is a diagram showing the pressure fluctuation of the cavitation acting part 5 when the second pipe part 3 is not provided. FIG. 3B is a diagram illustrating pressure fluctuations in the cavitation acting unit 5 of the present embodiment.

As shown in FIG. 2A, in general, ultrasonic cavitation causes pressure fluctuation in a predetermined portion by, for example, ultrasonic vibration. As a result, cavitation occurs due to the pressure periodically lower than the saturated water vapor P1 (acoustic cavitation). On the other hand, the cavitation generating device 1 of the present embodiment is formed so that Bernoulli's law is also used in order to further easily generate cavitation (hydrodynamic cavitation). Bernoulli's theorem is given by

Here, ρ: fluid density, P ₀ : pressure of the first pipe part 2 upstream of the fluid flow, V ₀ : flow velocity of the first pipe part 2 upstream of the fluid flow, P _{0 ′} : Pressure of the second pipe part 3, V _{0 ′} : Flow velocity of the second pipe part 3.

The second pipe part 3 has a smaller diameter than the first pipe part 2. Moreover, since the flow rate which flows through the arbitrary cross sections of the 1st pipe part 2 and the 2nd pipe part 3 which flow within unit time is equal, the flow velocity in the 2nd pipe part 3 is in the 1st pipe part 2. It is faster than the flow rate. Therefore, according to the formula (1), the pressure of the second tube portion 3 is lower than the pressure of the first tube portion 2. Since the fluid is the same in the first and second tube portions 2 and 3, the saturation vapor pressure curve is the same in the first and second tube portions 2 and 3. Therefore, as shown in FIG. 2B, the pressure P ₀ of the first pipe portion 2 is reduced to the pressure P _{0 ′} in the second pipe portion 3. That is, the pressure of the cavitation acting part 5 is reduced by Bernoulli's theorem. When the cavitation acting unit 5 is further pressurized by an ultrasonic vibrator or the like, the pressure periodically reaches a negative pressure from the saturated vapor pressure. As a result, the range of pressure fluctuation necessary for the occurrence of cavitation is reduced. That is, acoustic cavitation easily occurs.

  The solid line and the broken line shown in FIGS. 3A and 3B indicate pressure fluctuations in the vicinity of the vibration generating unit 8 due to vibration generated by the vibration generating source 8, respectively. As illustrated in FIGS. 3A and 3B, the broken line vibration has the same frequency as the solid line vibration frequency, but the broken line amplitude is smaller than the solid line amplitude. In other words, the broken line vibration has a smaller pressure fluctuation width than the solid line vibration.

  As shown in FIG. 3A, when the second pipe part 3 is not provided, the amplitude of the broken line does not fall below the saturated water vapor pressure P1, and thus a larger pressure fluctuation reaching the solid line is required. Thus, when a negative pressure state periodically falling below the saturated vapor pressure curve P1 can be realized, a phenomenon of cavitation generation, growth, and collapse, that is, cavitation occurs. On the other hand, as shown in FIG. 3B, when the second pipe portion 3 is provided, a negative pressure that periodically falls below the saturation vapor pressure curve P1 is generated even with the amplitude of the broken line. That is, cavitation can be generated even with a small amplitude.

  In the present embodiment, the cavitation action unit 5 is brought into close contact with the object 80. Thereafter, a fluid is supplied to the first and second pipe portions 2 and 3 from a fluid supply source (not shown). At this time, in the fluid, periodic pressure fluctuations occur due to the vibration of the vibration generating source 8, and cavitation occurs. As a result, in the cavitation acting unit 5, the object, for example, fat, is crushed or melted and emulsified by crushing the cavitation, and the emulsified object is circulated through the first and second pipe parts 2 and 3. It can be removed by fluid.

  According to the present embodiment, since the second pipe portion 3 is formed with a diameter smaller than that of the first pipe portion 2, cavitation can be generated even with a small pressure fluctuation, which is highly efficient. The vibration generating unit 8 can be downsized. Therefore, a small cavitation generator is provided, and an object can be easily removed with high efficiency without requiring heat treatment.

[Second Embodiment]
The cavitation generator 1 of the second embodiment is different in the second pipe portion 3 and the other constituent elements are the same as those in the first embodiment, and therefore the same structure as that in the first embodiment. Elements are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 4A is a schematic diagram of the cavitation generator 1 of the second embodiment.
In the second embodiment, the first and second tube portions 2 and 3 have a cylindrical shape extending in the longitudinal direction. The 1st and 2nd pipe parts 2 and 3 can be formed using an elastic member, for example, silicon or resin, or a metal member.

  In the second embodiment, the second tube portion 3 is formed such that the installation position of the vibration generation source 8 is convex inward, and the tube wall facing the installation position of the vibration generation source 8 is the first tube portion 2. The tube wall is formed in a straight line. The second pipe section 3 has a cavitation acting section 5 on the pipe wall facing the installation position of the vibration generating source 8. The vibration generating source 8 may be a piezoelectric element or a magnetostrictive element. Part of the vibration generating source 8 may be exposed in the tube of the second tube portion 3.

  The cavitation acting part 5 is an opening that opens to the object. The cavitation acting unit 5 is brought into close contact with the object to be removed, and closes the opening with the object to cause cavitation to act on the object.

  As shown in FIG. 4B, the cavitation generating apparatus 1 according to the second embodiment includes a plurality of vibration generating sources 8A and 8B and a plurality of cavitation generating units 5A and 5B. In this case, cavitation can be applied to a plurality of objects at the same time.

  Furthermore, as shown in FIG. 5A, the first and second tube portions 2, 3 of the second embodiment may be folded and stored in the cylindrical case 6. At this time, a part of the cylindrical case 6 is opened corresponding to the installation position of the cavitation acting part 5. Further, as shown in FIG. 5B, the cavitation generator 1 of the second embodiment in which a plurality of vibration sources 8A and 8B and a plurality of cavitation generators 5A and 5B are installed is housed in a cylindrical case 6. May be.

Furthermore, as shown in FIGS. 6A, 6B, and 6C, the cavitation generating device 1 may be configured such that the second pipe portion 3 and the cavitation acting portion 5 are installed at the distal end portion of the cylindrical case 6.
Furthermore, although the 1st and 2nd pipe parts 2 and 3 were made into the cylindrical shape, the cross-sectional shape of the ellipse may be sufficient and a square pillar shape may be sufficient.

  According to the present embodiment, by providing the cavitation acting unit generator 1 that matches the object on which cavitation acts, the contact property of the cavitation generator 1 to the object is improved. For this reason, the workability | operativity for grind | pulverizing, emulsifying, and removing a target object is improved.

[Third Embodiment]
The cavitation generating apparatus 1 of the third embodiment has a different shape, and the other constituent elements are substantially the same as those of the first embodiment. Therefore, the same constituent elements as those of the first embodiment are the same. Reference numerals are assigned and detailed descriptions thereof are omitted.

FIG. 7A is a perspective view of the cavitation generator 1 of the third embodiment, and FIG. 7B is a longitudinal sectional view of the cavitation generator 1 of the third embodiment.
The cavitation generating device 1 of the third embodiment has an internal member 4 that is press-fitted or inserted inside and fixed, and a case member 9 that has a cavitation acting portion 5 at the tip.

  The inner member 4 includes inner wall members 7A and 7B and a vibration generation source 8 mounted between the inner wall members 7A and 7B. The inner wall member 7A is attached to the proximal end side of the vibration generating source 8, and the inner wall member 7B is attached to the distal end side of the vibration generating source 8. The inner member 4 is press-fitted or inserted into the case member 9 and fixed so that the second tube portion 3 is formed on the distal end side of the inner wall member 7B, and the first tube portion 2 is a flow path through which fluid flows. The inside is divided into two in the radial direction.

  The inner wall members 7A and 7B are made of, for example, metal or resin. In addition, the inner wall member 7B has a curved surface at the distal end that contacts the fluid, and has a substantially hemispherical shape at the distal end, for example.

The vibration generation source 8 vibrates so as to generate cavitation in the vicinity of the cavitation acting unit 5, for example, vibrates in the longitudinal direction.
The case member 9 is, for example, a cylindrical shape having a substantially spherical tip. The cavitation acting part 5 is formed at the tip of the case member 9. Note that the cavitation acting unit 5 may change the size of the opening in accordance with the size of the object.

  A fluid supplied from a fluid supply portion (not shown) flows through the first tube portion 2 and the second tube portion 3 formed by inserting or inserting the internal member 4 into the case member 9. At this time, since the second pipe part 3 has a smaller cross-sectional area of the flow path than the first pipe part 2, the flow velocity of the fluid is increased. Here, when the equation (1) is further considered, since the pressure is reduced, a group of bubbles is generated, and a series of cavitations (phenomena) is likely to occur.

According to the present embodiment, the cavitation generating device 1 is composed of the internal member 4 and the case member 9, so that the structure is simple, and therefore, the assemblability is good. Therefore, the cavitation generator 1 can easily remove fat with high efficiency and can be further downsized.
In addition, since the inner wall member 7B and the case member 9 are curved surfaces that contact the fluid, the generation of vortices is suppressed. Therefore, cavitation is efficiently generated.

  A cavitation generating apparatus 1 according to a modification of the third embodiment is almost the same as that of the third embodiment. Therefore, the same components as those of the third embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 7C is a perspective view of a cavitation generating apparatus 1 according to a modification of the third embodiment.
The internal member 4 of the modified example is provided so as to be opposite to each other, and is formed such that two side surfaces along the longitudinal axis are flat. The inner wall member 7 </ b> B has a surface that contacts the flow path formed in a curved surface along the fluid flow direction.

In addition, the case member 9 has two side surfaces provided opposite to each other as a flat surface, and a tip portion formed into a curved surface along the fluid flow direction. The case member 9 has a cavitation acting part 5 formed at the tip part. Here, the size of the opening of the cavitation acting unit 5 is naturally changed corresponding to the object.
The inner member 4 is mounted inside the case member 9, and when the inner member 4 is mounted, the two side surface portions are in contact with the inner wall of the case member 9.

  In the modification of the present embodiment, the cavitation generating device 1 is easily formed because the cavitation acting part 5 is linearly formed in a direction perpendicular to the longitudinal direction, and the contact with the object is improved. Cavitation can be applied to the object, and the object can be easily removed with high efficiency. .

[Fourth Embodiment]
The cavitation generating apparatus 1 according to the fourth embodiment is substantially the same as the above-described embodiment except that the configuration of the vibration unit 13 is different. Therefore, the same components as those of the above-described embodiment are referred to by the same reference. Reference numerals are assigned and detailed description thereof is omitted.

8A is a cross-sectional view of the cavitation generating apparatus 1 according to the fourth embodiment, FIG. 8B is a cross-sectional view taken along a line DD in FIG. 8A, and FIG. 8C is a cross-sectional view taken along a line EE in FIG. It is sectional drawing.
As shown in FIG. 8A, the vibration source 8 has a horn 10 attached to the tip. The front end surface of the horn part 10 is installed so as to be the inner wall of the second pipe part 3. The horn part 10 is formed in a substantially conical shape, and its diameter increases toward the base end part as shown in FIGS. 8B and 8C. The horn unit 10 is made of a metal member such as titanium.

  The case portion 9 is formed so that the flow path of the second tube portion 3 is narrower than that of the first tube portion 2 when the horn portion 10 is installed. In the case portion 9, a separation wall 11 is installed from the base end portion to the tip of the horn 10 so that the inside of the case portion 9 is radially divided into two so that the fluid flows in one direction. 9A, 9B, and 9C, the vibrating portion 13 having the horn 10 and the vibration generating source 8 is formed to have an elliptical cross section, and the major axis of the elliptical shape is that of the case portion 9. As long as it is equivalent to the inner diameter and the inside of the case portion 9 can be divided into two in the radial direction, the separation plate 11 may be omitted. At this time, the horn 10 and the vibration generation source 8 are inserted into the case portion 9 and fixed. Therefore, the horn 10 and the vibration generating source 8 divide the case portion 9 into two in the radial direction so that the fluid flows in one direction.

The horn 10 expands the amplitude of the vibration generated by the vibration source 8.
According to this embodiment, since the amplitude can be increased by the horn 10, the vibration generating source 8 for generating the required cavitation can be reduced. Therefore, the cavitation generating apparatus 1 can be miniaturized, can easily generate cavitation with high efficiency, and can remove the object.

[Fifth Embodiment]
The cavitation generating apparatus 1 of the fifth embodiment is different in the configuration of the cavitation acting unit 5 and the other components are substantially the same as those of the above-described embodiment. The same reference numerals are assigned and detailed description thereof is omitted.

FIG. 10 is a schematic diagram of the cavitation generator 1 of the fifth embodiment.
The cavitation generating apparatus 1 according to the fifth embodiment prevents the inhalation of the cavitation acting part 5 from inside so that the lump of the object before emulsification that is not crushed or melted by the second pipe part 3 is not sucked into the inside. A member 12 is installed.

  The cavitation generating device 1 of the present embodiment can prevent clogging in the second pipe portion 3 by the inhalation preventing member 12. Therefore, the cavitation generating apparatus 1 can efficiently suction the object. Here, if the inhalation preventing member 12 is a material having an elastic modulus equivalent to that of muscle, cavitation is unlikely to act on a tissue having a high elastic modulus such as muscle tissue. Can be prevented.

[Sixth Embodiment]
The cavitation generating apparatus 1 of the sixth embodiment is different in the configuration of the cavitation acting unit 5 and the other components are substantially the same as those of the above-described embodiment. Therefore, the components are the same as those of the above-described embodiment. Are given the same reference numerals and their detailed description is omitted.

11A and 11B are schematic views of a cavitation generating apparatus according to the sixth embodiment.
As shown in FIG. 11A, in the cavitation generating device 1 of the sixth embodiment, the vibration generating source 8 is installed at the upstream end of the fluid flow from the cavitation acting portion 5 at the distal end portion of the inner wall member 7. Here, the vibration generating source may vibrate along the longitudinal direction, or may vibrate in a direction perpendicular to the longitudinal direction as shown in FIG. 11B.

As a result, cavitation is generated at the vibration source 8 and grows in accordance with the flow of the fluid, so that the cavitation acting unit 5 is crushed.
According to the present embodiment, in the cavitation generating devices 11A and 11B, the vibration generating source 8 is installed so that the crushing process occurs in the cavitation acting unit 5 in consideration of the movement of cavitation due to the flow. Therefore, cavitation can be effectively applied to the object.

  Note that the above-described cavitation generating apparatus 1 may be applied to an endoscope. By applying to an endoscope, the endoscope can be reduced in size and can perform minimally invasive procedures such as thrombus removal, stone crushing, and local fat removal.

  Furthermore, the above-described cavitation generating device 1 makes the vibration generating source 8 press-contact with the elastically deforming tube, the tube is elastically deformed, and the internal flow path becomes narrower than the surrounding tube, and its surroundings. The structure which forms the 1st pipe part 2 and the 2nd pipe part 3 by this pipe | tube may be sufficient.

  DESCRIPTION OF SYMBOLS 1 ... Cavitation generator, 2 ... 1st pipe part, 3 ... 2nd pipe part, 4 ... Internal member, 5 ... Cavitation action part, 6 ... Cylindrical case, 7, 7A, 7B ... Inner wall member, 8 ... Vibration Generation source, 9 ... case member, 10 ... horn, 11 ... separation plate, 12 ... inhalation preventing member, 13 ... vibrating part, 80 ... object.

Claims (7)

A first pipe portion provided inside a first flow path for circulating a medium in which cavitation occurs;
A second flow path flow path is formed narrower than the tube diameter of around a predetermined portion of the first tubular portion,
A vibration generator for generating a pre-Symbol cavitation,
Anda Ruki Yabiteshon acting portion to act on the object cavitation that the generated,
The vibration generating unit, the second of the flow path are vibrated varying the pressure, key Yabiteshon generator for generating said cavitation. A cylindrical case member having the cavitation acting portion at the tip,
An inner wall member that divides the inside of the cylindrical case member into two in the radial direction;
Forming the first flow path between the inner wall member and the inner wall of the cylindrical case member ;
Wherein in the vicinity of the cavitation effects unit, cavitation generator according to claim 1 that form a second flow path between the inner wall of said inner wall member and the cylindrical casing member. The cavitation generator according to claim 1 or 2, wherein the vibration generator is installed on an outer side surface of the second flow path. The vibration generating unit, cavitation generator according to any one of 請 Motomeko 1-3 horn Ru is mounted on an end portion of the cavitation acting portion side. The cavitation action unit, cavitation generator according to any one of 請 Motomeko 1 to 4 that have a suction preventing member. The suction preventing member is a member of the same modulus and muscles, cavitation generator according to claim 5 that will be formed in a mesh shape. The vibration generating unit, cavitation generator according to any one of 請 Motomeko 1 to 6 Ru are Installation upstream from the installation position of the cavitation acting portion in the direction of flow of the medium.

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