JP2009214192A - Fluid injection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid injection device for injecting a liquid from a plurality of fluid injection openings. <P>SOLUTION: The fluid injection device comprises: a column-like base 60; a fluid injection part 10 including volume variable chambers 21 and 22 provided respectively inside a plurality of dents bored on an outer peripheral side face of the base 60, fluid chambers 61 and 62 formed respectively inside the volume variable chambers 21 and 22, diaphragms 40 and 41 respectively sealing the fluid chambers 61 and 62, outlet passages 30 and 31 communicating with sidewalls of the fluid chambers 61 and 62 approximately parallel to a displacement direction of the diaphragms 40 and 41, the fluid injection openings 30a and 31a provided at the leading edges of the passages 30 and 31, and inlet passages 35 and 36 respectively communicating with the fluid chambers 61 and 62; and a liquid supply tube 80 having liquid supply paths 81 and 82 communicating with the inlet passages 35 and 36. Volumes of the fluid chambers 61 and 62 are reduced by the diaphragms 40 and 41 to eject the liquid in a pulsatory manner from the openings 30a and 31a. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fluid ejecting apparatus having a plurality of variable volume chambers and a fluid ejecting opening communicating with each of the plurality of variable volume chambers.

  Surgery with the ejected fluid allows the incision of the organ parenchyma while preserving the vasculature such as blood vessels, and the incidental damage to living tissue other than the incision is minimal, resulting in a burden on the patient. In addition, since the bleeding is small and bleeding does not interfere with the field of view of the operative field, rapid surgery is possible.

  Such a surgical device using a fluid to be ejected includes a liquid chamber having one opening at the proximal end and a vapor generating means facing the opening, and the liquid chamber generates a micro liquid jet during operation. There is known a micro liquid jet generating apparatus that causes the liquid to generate (see, for example, Patent Document 1).

  Further, there is known a water jet surgical apparatus including a water jet catheter having a flow path for passing a high-pressure fluid and having a jet nozzle having a flat flow path cross-sectional shape at the tip (for example, Patent Document 2). reference).

  Furthermore, a water jet catheter having a flow path for passing a high-pressure fluid and having an injection nozzle at the tip, and a suction port at the tip that is provided separately from the water jet catheter, and this suction port is used as an injection nozzle There is also known a water jet surgical apparatus including a drainage suction catheter that is placed in the same position and positioned forward (see, for example, Patent Document 3).

Special table 2003-500098 gazette JP-A-6-90957 Japanese Patent Laid-Open No. 5-285150

  In both Patent Document 1 to Patent Document 3, one nozzle for ejecting fluid is provided for the high-speed fluid generator, and in order to increase the resecting capability, the injection speed is increased and the injection amount is increased. Let However, in this way, it can be considered that the water flow enters the living tissue too deeply.

  In order to solve such a problem, it has been proposed to flatten the tip of the injection nozzle as described in Patent Document 2, but by flattening the injection nozzle, the injection area becomes large and sufficient. The problem that it is difficult to obtain a sufficient excision pressure arises.

  According to Patent Document 3, a drainage suction catheter separate from a water jet catheter having an injection nozzle is also provided. In such a configuration, liquid injection (resection) and drainage suction can be performed at the same time, but the apparatus becomes large, and it is difficult to perform operations on a minute gap or insert the apparatus into a thin tube such as a blood vessel. .

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A fluid ejection device according to this application example is formed by a columnar base body having a plurality of recesses formed on the outer peripheral surface, a diaphragm for sealing each of the plurality of recesses, the recess, and the diaphragm. A plurality of variable volume chambers composed of a plurality of fluid chambers, an outlet channel communicating with the side walls of each of the plurality of fluid chambers substantially parallel to the direction of displacement of the diaphragm, and a tip of the outlet channel. A fluid ejection opening, an inlet channel communicating with each of the plurality of fluid chambers, and a fluid supply tube communicating with the inlet channel, the volume of the fluid chamber being reduced by the diaphragm, and The fluid is ejected in pulses from the fluid ejection opening.

  According to this application example, each of the plurality of variable volume chambers is provided with an outlet flow path and a fluid ejection opening. Therefore, by setting a volume reduction rate by a diaphragm in each of the variable volume chambers, the surgical section hardness can be reduced. An appropriate fluid ejection speed and ejection amount can be obtained.

  In addition, as described above, fluid can be ejected from a plurality of fluid ejection openings while appropriately setting each fluid ejection opening, so that the amount of fluid ejection can be increased as a whole fluid ejection device, and the resecting capability can be increased. Can be increased.

  Application Example 2 In the fluid ejecting apparatus according to the application example described above, it is preferable that each of the plurality of variable volume chambers be spaced apart in the circumferential direction of the outer peripheral side surface of the base.

  According to such a configuration, since the plurality of variable volume chambers are disposed in the recesses formed in the circumferential direction of the outer peripheral side surface of the columnar base body, a thin fluid ejecting unit having no protrusion is configured. Therefore, it is possible to realize a fluid ejecting apparatus capable of performing operations on a minute gap and inserting the apparatus into a thin tube such as a blood vessel.

  Application Example 3 In the fluid ejecting apparatus according to the application example described above, it is preferable that each of the plurality of variable volume chambers be provided side by side in the planar direction.

  Since the fluid ejecting apparatus having such a configuration has a flat shape but has a plurality of fluid ejecting openings, by simply flattening the ejecting nozzle as in Patent Document 2 described above, the ejecting area can be reduced. The problem of widening and difficulty in obtaining sufficient excision pressure can be solved. Further, since the fluid can be ejected from each of the plurality of fluid openings at a high speed, it is possible to excise a long surgical line, thereby having an effect of enabling exfoliation other than an open operation.

  Application Example 4 In the fluid ejecting apparatus according to the application example, it is preferable that the fluid supply tube communicating with each of the plurality of inlet flow paths is provided.

  According to such a configuration, the variable volume chamber, the fluid chamber provided in the interior, the outlet flow path (fluid ejection opening), the inlet flow path, and the fluid supply tube are dedicated, and a plurality of variable volumes are available. In addition to being able to individually set the fluid ejection speed and ejection amount between the chambers, variations can be reduced.

  Application Example 5 In the fluid ejecting apparatus according to the application example described above, it is preferable that an outer tube that is fitted to the outer peripheral portion of the base body and that includes the fluid supply tube is further provided.

  When the fluid supply tube is communicated with each of the plurality of inlet flow paths, a step is formed between the outer periphery of the fluid ejecting unit and the outer periphery of each of the fluid tubes. Therefore, by providing an outer tube that encloses these fluid supply tubes, if the outer circumferences of the fluid ejecting portion and the outer tube have substantially the same outer diameter, the above step is eliminated, and the fluid ejecting portion is provided between the blood vessels and the like. Insertion or withdrawal can be facilitated and damage to the tissue can be prevented.

  In addition, each fluid supply tube may be very thin and may not have sufficient strength. However, by providing an outer tube, the fluid supply tube can be protected and easy to handle.

  Application Example 6 In the fluid ejecting apparatus according to the application example described above, the fluid supply tube communicates with the plurality of inlet flow paths and is fitted to the outer peripheral portion of the base so as to seal the plurality of variable volume chambers. Preferably it is worn.

  As described above, the variable volume chamber is disposed in a recess formed in the outer peripheral portion of the base. By sealing the variable volume chamber with the fluid supply tube, it is possible to prevent the diaphragm from being obstructed by the liquid adhering to the variable volume chamber in an environment containing liquid.

Further, with such a configuration, it is possible to simplify the structure by supplying fluid to the plurality of inlet channels and sealing the variable volume chamber with a single fluid supply tube.
Further, the fluid ejecting unit including the base body and the variable volume chamber is accommodated in the fluid supply tube, and the fluid ejecting unit can be present in the extension range of the fluid supply tube. There is an effect that it becomes easy to insert.

  Application Example 7 In the fluid ejecting apparatus according to the application example described above, a common inlet channel for the plurality of fluid chambers, and a connection flow branched from the inlet channel and communicated with each of the plurality of fluid chambers It is preferable that a path is provided.

  When the number of liquid supply tubes corresponding to the inlet flow passages provided with a plurality of variable volume chambers and communicating with these increases, the fluid supply tubes interfere with each other to cause the outer diameter of the substrate (that is, the outer diameter of the fluid ejecting portion) Will become bigger. However, in the configuration according to the application example 4 described above, if a single inlet channel and a fluid supply tube are provided, and the inside of the base is branched from a single inlet channel to a connection channel communicating with each of a plurality of fluid chambers, a small diameter is provided. A fluid ejecting unit can be realized.

  Application Example 8 In the fluid ejecting apparatus according to the application example described above, it is preferable that each of the plurality of outlet channels is communicated with a plurality of protrusions protruding from the tip of the base.

  According to such a configuration, each of the plurality of outlet channels is communicated with the protrusion that protrudes from the tip of the base. Therefore, the fluid ejection openings are provided in these protrusions, and a good field of view can be obtained for each fluid ejection opening and the surgical site.

  Application Example 9 In the fluid ejecting apparatus according to the application example described above, it is preferable that the fluid supply tube has a plurality of fluid supply paths that communicate with the plurality of inlet channels.

  According to such a configuration, the fluid supply path corresponding to each of the plurality of inlet flow paths is formed in one fluid supply tube, whereby the structure is simplified and the outer diameter of the base (that is, the fluid ejecting section) ) Can be reduced.

  Application Example 10 In the fluid ejecting apparatus according to the application example described above, it is preferable that a fluid retention chamber is provided between the inlet channel and the fluid supply channel of the fluid supply tube.

  When the fluid chamber, the inlet channel, and the fluid supply path are communicated in series as they are, unnecessary fluid flow may occur due to the fluid pressure from the fluid supply path during the pulse-like ejection. Therefore, by providing the fluid retention chamber, the fluid filled in the fluid retention chamber becomes a buffer portion, and generation of unnecessary fluid flow can be suppressed.

  On the contrary, at the time of pulse-like ejection, the fluid filled in the fluid retention chamber becomes a fluid resistance, and it is possible to prevent the fluid from flowing backward from the inlet channel.

  Application Example 11 In the fluid ejecting apparatus according to the application example described above, it is preferable that a suction channel that penetrates from the tip of the base to the tail and a suction tube that communicates with the suction channel are provided.

  According to such a configuration, the tissue excision by the liquid ejection from the fluid ejection opening, and the residue and drainage by the tissue excision can be aspirated from the suction channel. Since the suction channel is formed in the substrate, a fluid ejecting apparatus that is smaller than a configuration in which a water jet catheter and a drainage suction catheter are provided together as in Patent Document 3 described above can be realized.

  Application Example 12 In the fluid ejecting apparatus according to the application example described above, the fluid supply tube and the suction tube are formed as an integral connection tube, and a fluid supply path that communicates with the plurality of inlet channels, and the suction flow It is desirable that a suction path communicating with the path is provided in the connection tube.

  According to such a configuration, a plurality of fluid supply paths and a suction path are formed in one connection tube, so that even if a plurality of fluid supply paths and a suction flow path are provided, the structure is small. However, a simple fluid ejecting apparatus can be realized.

  Application Example 13 In the fluid ejection device according to the application example described above, it is preferable that the drive timings of the plurality of variable volume chambers coincide with each other.

  By matching the drive timings of all the variable volume chambers provided, the fluid ejection amount as a whole can be increased and the excision ability can be enhanced.

  Application Example 14 In the fluid ejecting apparatus according to the application example described above, it is preferable that the drive timing of each of the plurality of variable volume chambers is shifted.

  With such a configuration, by changing the timing of fluid ejection from each fluid ejection opening, for example, the excision ability becomes smaller than in the case of matching the above-mentioned timings. The field of view can be secured by cleaning the excision with a fluid having a weak excision ability.

  Application Example 15 In the fluid ejection device according to the application example described above, it is preferable that the ejection speed and the ejection amount of the fluid ejected from each of the plurality of volume variable chambers are equal.

  In such a configuration, the configuration and dimensions of the plurality of variable volume chambers can be made the same and the drive signal to be input can be made common, so that the structure including the drive control circuit that generates the drive signal can be simplified.

  Application Example 16 In the fluid ejection device according to the application example described above, it is preferable that the ejection speed and the ejection amount of the fluid ejected from at least one of the plurality of volume variable chambers are different from the others.

  If it does in this way, according to the hardness and state of an excision part, it will become possible to select and use an appropriate jet speed and jet quantity.

  Application Example 17 In the fluid ejecting apparatus according to the application example described above, it is preferable that some of the plurality of variable volume chambers are selectively driven.

  If it does in this way, according to the hardness and range of an excision part, a required volume variable chamber can be selected and used. In this case, one, a plurality, or all of the variable volume chambers may be selected.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 6 are Embodiment 1 and its modification, FIGS. 7 and 8 are Embodiment 2, FIG. 9 is Embodiment 3, FIG. 10 is Embodiment 4, FIGS. 11 and 12 are Embodiment 5, and FIG. 7 shows a fluid ejection device according to a sixth embodiment.
Note that the drawings referred to in the following description are schematic views in which the vertical and horizontal scales of members or portions are different from actual ones for convenience of illustration.
In addition, the fluid ejecting apparatus according to the present invention can be used in various ways such as drawing using ink, washing fine objects and structures, and a scalpel. However, in the embodiment described below, it is suitable for a fluid ejecting apparatus suitable for installation at the distal end of a catheter used for the purpose of inserting into a blood vessel and removing a thrombus, or for incising or excising a living tissue. A fluid ejecting apparatus will be described as an example. Therefore, the fluid used in the embodiment is water or physiological saline, and hereinafter, these fluids may be collectively referred to as a liquid.
(Embodiment 1)

  FIG. 1 is an explanatory diagram illustrating an example of a schematic configuration of the fluid ejecting apparatus according to the first embodiment. In FIG. 1, a fluid ejecting apparatus 100 contains a liquid as a basic configuration and includes a drive control unit 110 including an infusion bag as a liquid supply unit that supplies the liquid, a fluid ejecting unit 10 that changes the liquid into pulsation, A liquid supply tube 80 that communicates the drive control unit 110 and the fluid ejection unit 10 with each other. The fluid ejecting unit 10 changes the liquid into a pulsation and ejects the liquid 200 as a droplet 200 at high speed from a plurality of liquid ejecting openings.

  The drive control unit 110 includes a drive waveform generation circuit unit and a drive control circuit unit (not shown), an adjustment device 112 that adjusts the drive waveform in accordance with conditions such as the hardness of the surgical site, the resection range, and the like. Etc. are provided.

Next, the fluid ejecting apparatus of this embodiment will be described with reference to FIG.
2A and 2B show a fluid ejecting unit according to the first embodiment, in which FIG. 2A is a cross-sectional view showing a cut surface cut along a liquid flow direction, and FIG. 2B shows an AA cut surface of FIG. Sectional drawing, (c) is sectional drawing which shows the BB cut surface of (a), (d) has shown the sectional shape of the liquid supply tube. 2A to 2C, the fluid ejecting unit 10 includes a plurality of variable volume chambers 21 and 22 inside.

As shown in FIG. 2B, the variable volume chambers 21 and 22 are disposed in recesses formed at positions facing each other on the outer periphery of the columnar base 60.
The variable volume chamber 21 is fixed to the periphery of the upper opening of the fluid chamber 61, and includes a diaphragm 40 that hermetically seals the fluid chamber 61, and a piezoelectric element 51 provided on the surface of the diaphragm 40.

On the other hand, the variable volume chamber 22 is fixed to the periphery of the upper opening of the fluid chamber 62, and includes a diaphragm 41 that hermetically seals the fluid chamber 62, and a piezoelectric element 52 provided on the surface of the diaphragm 41.
Accordingly, there is no portion protruding from the outer peripheral portion of the base body 60 in both the variable volume chambers 21 and 22.

  In the fluid chamber 61, a side wall substantially parallel to the displacement direction of the diaphragm 40 and an outlet channel 30 communicating with the tip 60a of the base body 60 are formed, and the tip of the outlet channel 30 is a fluid ejection opening 30a.

  The fluid chamber 62 is formed with a side wall substantially parallel to the displacement direction of the diaphragm 41 and an outlet channel 31 communicating with the tip 60a of the base 60. The tip of the outlet channel 31 is a fluid ejection opening 31a. is there.

  Both the outlet channels 30 and 31 are set so that the cross-sectional area perpendicular to the liquid flow direction is much smaller than the cross-sectional area of the fluid chambers 61 and 62 in the same direction. Therefore, the site | part comprised by the exit flow path 30 and the fluid ejection opening part 30a and the exit flow path 31 and the fluid ejection opening part 31a comprises a nozzle.

  An inlet channel 35 is formed at a position facing the outlet channel 30, and an inlet channel 36 is formed at a position facing the outlet channel 31. The inlet channel 35 penetrates between the fluid chamber 61 and the tail portion 60 b of the base body 60, and the inlet channel 36 penetrates between the fluid chamber 62 and the tail portion 60 b of the base body 60.

  Further, connecting pipes 71 and 72 are planted on the tail portion 60 b of the base body 60. The connection pipe 71 is provided with a connection flow path 71a, and a part thereof protrudes from the tail part 60b. The connection channel 71 a communicates with the inlet channel 35. The cross-sectional area perpendicular to the liquid flow direction of the connection flow path 71a is larger than the cross-sectional area of the inlet flow path 35 in the same direction. The connection channel 72 a communicates with the inlet channel 36. The cross-sectional area perpendicular to the liquid flow direction of the connection flow path 72a is larger than the cross-sectional area of the inlet flow path 36 in the same direction.

  A lid cylinder 70 is fitted on the outer periphery of the base body 60. The lid cylinder 70 is provided over substantially the entire length of the base body 60 and is closely fixed to the base body 60. Accordingly, the variable volume chambers 21 and 22 are hermetically sealed with the spaces 21a and 22a, respectively. The spaces 21a and 22a are set to a size that secures the movable range of the diaphragms 40 and 41.

  A liquid supply tube 80 is attached to the tail portion 60 b of the base body 60. As shown in FIG. 2D, the liquid supply tube 80 has liquid supply paths 81 and 82 opened. The liquid supply path 81 is fitted to the connection pipe 71, and the liquid supply path 82 is fitted to the connection pipe 72. Thus, the fluid chamber 61 communicates with the liquid supply path 81 and the fluid chamber 62 communicates with the liquid supply path 82.

The liquid supply tube 80 communicates with the infusion bag in the drive control unit 110 shown in FIG. 1, and the liquid is supplied from the infusion bag to the fluid chambers 61 and 62 through the liquid supply paths 81 and 82 at a constant pressure.
The outer diameter of the liquid supply tube 80 is substantially the same as the outer diameter of the lid cylinder 70, and the outer shapes of the fluid ejecting unit 10 and the liquid supply tube 80 are continuous.

  Next, the outline of the flow of the liquid in the fluid ejecting apparatus 100 according to the present embodiment will be briefly described with reference to FIGS. Inside the drive control unit 110, an infusion bag and a pressure generating unit (both not shown) connected to the infusion bag are incorporated. The pressure generator is connected to the liquid supply tube 80 so as to deliver the liquid. The liquid stored in the infusion bag is supplied to the inlet channels 35 and 36 through the liquid supply tube 80 (liquid supply channels 81 and 82) at a constant pressure by the pressure generating unit. Further, the liquid is ejected in pulses from the fluid ejection openings 30a and 31a through the fluid chambers 61 and 62 and the outlet channels 30 and 31.

  Note that the infusion bag is separated from the drive control unit 110 and disposed at a high position with respect to the fluid ejecting unit 10, and a pressure difference caused by a difference in position head of the infusion bag and the fluid ejecting unit 10 is utilized. A configuration may be adopted in which the liquid is allowed to flow into the fluid ejecting unit 10 at a constant pressure.

  Next, the operation of the fluid ejecting unit 10 will be described. This will be described with reference to FIG. Since the individual basic operations of the variable volume chambers are the same, the variable volume chamber 21 will be described as an example. First, the drive waveform formed by the drive waveform generation circuit unit included in the drive control unit 110 is applied from the drive control circuit unit to the piezoelectric elements 51 and 52.

  The fluid is supplied from the inlet channel 35 to the fluid chamber 61. Here, when a drive signal is input to the piezoelectric element 51 and the piezoelectric element 51 is charged and the piezoelectric element 51 contracts rapidly, the diaphragm 40 is suddenly displaced in a convex shape in the direction of reducing the volume of the fluid chamber 61. . As a result, the pressure in the fluid chamber 61 rises rapidly to reach several atmospheres if the combined inertances L1 and L2 on the inlet channel 35 side and the outlet channel 30 side have a sufficient size. .

Since this pressure is much larger than the pressure generated by the pressure generating unit applied to the inlet channel 35, the inflow of liquid from the inlet channel 35 side into the fluid chamber 61 is reduced by the pressure, and the outlet channel 30. Outflows from will increase. However, since the synthetic inertance L1 on the inlet flow path 35 side is larger than the synthetic inertance L2 on the outlet flow path 30 side, the amount of liquid inflow from the inlet flow path 35 into the fluid chamber 61 is smaller than that from the outlet flow path 30. The increase in spillage is large.
As a result, pulsed fluid ejection, that is, high-speed droplets 200 are ejected in pulses from the fluid ejection opening 30a through the outlet channel 30.

  On the other hand, after the volume of the fluid chamber 61 is reduced, the piezoelectric element 51 discharges and returns to the initial state as the drive voltage decreases. The fluid chamber 61 is in a low pressure or vacuum state after the pressure rises due to the interaction between the decrease in the amount of liquid inflow from the inlet channel 35 and the increase in the liquid outflow from the outlet channel 30, and the liquid from the inlet channel 35 becomes liquid. Flows into the fluid chamber 61. Thereafter, if the piezoelectric element 51 contracts, high-speed pulsed droplets can be continuously ejected from the fluid ejection opening 30a.

  Since the same operation is performed on the variable volume chamber 22 side, droplets are simultaneously ejected from the fluid ejection openings 30a and 31a at a high speed.

  Therefore, according to the above-described configuration, the outlet flow passages 30 and 31 and the fluid ejection openings 30a and 31a are provided in the plurality of variable volume chambers 21 and 22, respectively, so that the diaphragms 40 and 41 are respectively provided in the variable volume chambers. By setting the volume reduction ratio according to the above, it is possible to obtain a fluid ejection speed and ejection amount appropriate for the surgical site hardness.

  In addition, since the fluid can be ejected simultaneously from the fluid ejection openings 30a and 31a while appropriately setting the ejection conditions of the fluid ejection openings 30a and 31a, the fluid ejection amount of the fluid ejection device 100 (fluid ejection section 10) as a whole Can increase the excision ability.

  Further, since the variable volume chambers 21 and 22 are disposed in the recesses formed in the opposite side surfaces of the outer periphery of the columnar base body 60, the thin fluid ejecting unit 10 having no protrusion can be configured. It is possible to realize a fluid ejecting apparatus that can perform a surgical operation with a minute gap and insert the apparatus into a thin tube such as a blood vessel.

In addition, since the liquid supply tube 80 includes a plurality of liquid supply paths 81 and 82 communicating with the inlet channels 35 and 36, the connection structure of the liquid supply tube 80 to the fluid ejecting unit 10 is simplified. In addition, the outer diameter of the base body 60 (that is, the outer diameter of the fluid ejecting portion) can be reduced.
(First modification)

Then, the 1st modification of Embodiment 1 is demonstrated with reference to drawings. The first modified example is characterized in that a liquid supply tube communicating with each of the plurality of inlet channels is provided. Therefore, differences from the first embodiment will be described.
FIG. 3 is a partial cross-sectional view illustrating a fluid ejection unit according to a first modification of the first embodiment. In FIG. 3, a liquid supply tube 83 is fitted to a connection pipe 71 having a connection channel 71 a communicating with the inlet channel 35. On the other hand, a liquid supply tube 84 is fitted to the connection pipe 72 having the connection flow path 72 a communicating with the inlet flow path 36. The liquid supply tubes 83 and 84 are connected to the infusion bag described above.

  An outer tube 90 that includes the liquid supply tubes 83 and 84 is provided outside the liquid supply tubes 83 and 84 that are provided corresponding to the inlet channels 35 and 36. More preferably, the outer tube 90 is fitted to the tail portion 60 b of the base body 60 and is provided in the entire length range of the liquid supply tubes 83 and 84. The end of the outer tube 90 is inserted to a position where it abuts on the end of the lid cylinder 70, and the outer diameter is substantially equal to the outer diameter of the lid cylinder 70.

  With such a configuration, the variable volume chambers 21 and 22, the fluid chambers 61 and 62 provided therein, the outlet channels 30 and 31 (fluid ejection openings 30 a and 31 a), and the inlet channels 35 and 36. And the liquid supply tubes 83 and 84 are a dedicated combination. Therefore, it is possible to reduce the variation among the plurality of variable volume chambers. Further, the fluid ejection speed and the ejection amount can be individually set.

  Furthermore, if the outer tube 90 is provided and the outer periphery of the fluid ejecting unit 10 (the outer periphery of the lid cylinder 70 in the first modification) and the outer periphery of the outer tube 90 have substantially the same outer diameter, fluid ejection is performed between the blood vessels and the like. It is easy to insert or withdraw the part, and it is possible to prevent the tissue from being damaged by the insertion and withdrawal.

Further, the liquid supply tubes 83 and 84 are very thin and it may be difficult to ensure sufficient strength. However, by providing the outer tube 90, the liquid supply tubes 83 and 84 can be protected, Handling becomes easy.
(Second modification)

Then, the 2nd modification of Embodiment 1 is demonstrated with reference to drawings. The second modification is characterized in that the fluid supply tube communicates with the plurality of inlet flow paths and is fitted to the outer peripheral portion of the base so as to seal the plurality of variable volume chambers. Therefore, the description will focus on the differences from the first embodiment.
FIG. 4 is a cross-sectional view illustrating a fluid ejection unit according to a second modification of the first embodiment. In FIG. 4, the fluid ejecting unit 10 is configured by fitting a liquid supply tube 80 to the outer periphery of a base body 60 in which the variable volume chambers 21 and 22 are disposed.

  The base 60 is provided with a flange 60c on the outer periphery of the tip. Further, the inlet channel 35 communicating with the fluid chamber 61 penetrates to the tail portion 60b. On the other hand, the inlet channel 36 communicating with the fluid chamber 62 penetrates to the tail portion 60b. Both the inlet channels 35 and 36 are communicated with the liquid supply path 85 of the liquid supply tube 80.

  The liquid supply tube 80 is inserted to a position where the end portion comes into contact with the flange portion 60c of the base 60, and the upper portions of the variable volume chambers 21 and 22 are hermetically sealed. Note that the outer diameter of the liquid supply tube 80 is substantially the same as the outer diameter of the flange 60c. Other configurations are the same as those of the first embodiment (see FIG. 2).

  Accordingly, with such a configuration, the variable volume chambers 21 and 22 are sealed with the liquid supply tube 80, so that the variable volume chambers 21 and 22 (specifically, the diaphragm 40, 41 and the piezoelectric elements 51 and 52) can be prevented from obstructing the driving of the variable volume chambers 21 and 22 due to the liquid adhering thereto.

  Further, with such a configuration, the fluid supply to the plurality of inlet channels and the sealing of the variable volume chamber can be performed with one fluid supply tube, and the structure can be simplified.

Further, the fluid ejecting unit 10 including the base body 60 and the variable volume chambers 21 and 22 is accommodated in the liquid supply tube 80, and the fluid ejecting unit 10 can be present in the extension range of the liquid supply tube 80. There is an effect that it can be easily inserted into a vascular structure such as a blood vessel.
(Third Modification)

Then, the 3rd modification of Embodiment 1 is demonstrated with reference to drawings. The third modified example is characterized in that each of the plurality of outlet channels is communicated with a protruding portion protruding from the tip of the base. Therefore, the description will focus on the differences from the first embodiment.
FIG. 5 is a cross-sectional view illustrating a fluid ejection unit according to a third modification of the first embodiment. In FIG. 5, the fluid ejecting section 10 has outlet flow passages 30 and 31 communicated with the fluid chambers 61 and 62, respectively.

  Discharge pipes 75 and 76 as projecting portions are planted at the distal end portion 60 a of the base body 60. The discharge pipe 75 has a flow path 75 a communicating with the outlet flow path 30, and the discharge pipe 76 has a flow path 76 a communicating with the outlet flow path 31. The cross-sectional area perpendicular to the liquid flow direction of each of the flow paths 75a and 76a is preferably the same as or slightly reduced from the cross-sectional area of each of the outlet flow paths 30 and 31. In addition, a liquid ejection opening is formed at the tip of the channels 75a and 76a.

In addition, it is good also as a structure which forms the projection part of a similar shape from the base | substrate 60 with the base | substrate 60 with respect to the discharge pipes 75 and 76. FIG.
In addition, the connection structure between the liquid supply tube and the inlet channel can be adapted to the structure described in the first modification (see FIG. 3) or the second modification (see FIG. 4).

Therefore, according to such a configuration, each of the outlet channels 30 and 31 is communicated with the discharge pipes 75 and 76 as projections protruding from the tip of the base body 60. Each of these protrusions is provided with a fluid ejection opening, and a good field of view can be obtained for each fluid ejection opening and the surgical site.
(Fourth modification)

Then, the 4th modification of Embodiment 1 is demonstrated with reference to drawings. The fourth modification is characterized in that a common inlet channel for supplying fluid to a plurality of fluid chambers and a connection channel branched from the inlet channel and communicated with each of the fluid chambers are provided. . Therefore, the description will focus on the differences from the first embodiment.
6A and 6B are cross-sectional views illustrating a fluid ejecting unit according to a fourth modification of the first embodiment, in which FIG. 6A is a cross-sectional view taken along the flow direction of the liquid, and FIG. It is sectional drawing which shows C cut surface. 6 (a) and 6 (b), the fluid ejecting section 10 is provided with a single inlet channel 65 common to the fluid chambers 61 and 62. The inlet channel 65 is provided at a substantially central portion in the cross-sectional direction of the base body 60, one end portion extends to a position reaching the bottom of the fluid chambers 61 and 62, and the other end portion penetrates the tail portion 60b. Yes.

  A connection flow channel 66 that communicates with the fluid chamber 61 and a connection flow channel 67 that communicates with the fluid chamber 62 are branched from the inlet flow channel 65. Here, the inlet channel 65 has a cross-sectional area that allows a sufficient liquid supply to the fluid chambers 61 and 62. The combined inertance of the inlet channel 65 and the connecting channel 66 or the connecting channel 67 is the combined inertance L1 on the inlet channel side, and is larger than the combined inertance L2 of the outlet channel 30 or the outlet channel 31. In addition, the cross-sectional area and the channel length of the inlet channel 65 and the connection channels 66 and 67 are set.

  In addition, the liquid supply tube 80 is inserted to a position where the end abuts against the flange portion 60c of the base body 60 and is fitted to the outer peripheral portion of the base body 60, as in the second modified example (see FIG. 4). The upper portions of the variable volume chambers 21 and 22 are hermetically sealed.

  The variable volume chambers 21 and 22 are sealed by the lid cylinder 70 in the same manner as in the first modified example (see FIG. 3) described above, and the liquid supply tube 80 is placed in the outer peripheral portion near the tail portion 60b of the base body 60. It is good also as a structure fitted by.

  Although not shown, a liquid tube fitting portion that communicates with the inlet channel 65 may protrude from the tail portion 60b, and the liquid supply tube 80 may be fitted and connected to the liquid tube fitting portion. At that time, as in the first modification (see FIG. 3), it is more preferable that the outer tube 90 containing the liquid supply tube 80 is provided.

When the number of liquid supply tubes corresponding to the inlet flow passages provided with a plurality of variable volume chambers and communicating with these chambers increases, the liquid supply tubes interfere with each other to cause the outer diameter of the base body 60 (that is, outside the fluid ejecting unit 10 (Diameter) becomes large. However, in the configuration according to the above-described fourth modified example, if the inlet channel 65 and the liquid supply tube 80 are one and branch from the one inlet channel 65 to the connection channels 66 and 67 inside the base body 60, the small diameter is obtained. The fluid ejecting unit 10 can be realized.
(Embodiment 2)

Next, the liquid ejecting apparatus according to the second embodiment will be described with reference to the drawings. Embodiment 2 is characterized in that a liquid retention chamber is provided between the inlet flow path and the liquid supply path of the liquid supply tube. Therefore, the description will focus on the differences from the first embodiment (see FIG. 2).
7A and 7B are cross-sectional views illustrating the fluid ejecting unit according to the second embodiment. FIG. 7A is a partial cross-sectional view taken along the flow direction of the liquid, and FIG. It is sectional drawing shown. 7A and 7B, the fluid ejecting unit 10 is configured by fitting a connection pipe 95 to the tail part 60 b of the base body 60 and fitting a liquid supply tube 80 to the connection pipe 95.

  The connecting pipe 95 communicates with both of the inlet channels 35 and 36 on the base 60 side, and a liquid retention chamber 96 having a volume much larger than the volume of the inlet channels 35 and 36 is provided. The connection pipe 95 is further provided with a connection opening 95 a that allows the liquid retention chamber 96 and the liquid supply tube 80 to communicate with each other. The cross-sectional area perpendicular to the liquid flow direction of the connection opening 95a is larger than the total cross-sectional area of the inlet channels 35 and 36.

Further, the outer diameter of the liquid supply tube 80 substantially coincides with the outer diameter of the lid cylinder 70, and the opposing end portions are in close contact with each other.
There are various configurations of the liquid retention chamber, and one of the modifications will be described below.
(Modification of Embodiment 2)

Subsequently, a liquid ejecting unit according to a modification of the second embodiment will be described with reference to the drawings.
FIG. 8 is a partial cross-sectional view illustrating a schematic configuration of a liquid ejecting unit according to a modification of the second embodiment. In FIG. 8, the fluid ejecting unit 10 is configured by fitting a liquid supply tube 80 in which a liquid retention chamber 97 is provided in a tail portion 60 b of a base body 60.

  The liquid retention chamber 97 communicates with both the inlet channels 35, 36, has a volume much larger than the volume of the inlet channels 35, 36, and is drilled at the fitting side end of the liquid supply tube 80. Composed. The liquid supply tube 80 is provided with a liquid supply path 80a having a cross-sectional area smaller than the cross-sectional area of the liquid retention chamber 97 perpendicular to the liquid flow direction. The liquid supply tube 80 is attached to the base body 60 by fitting the inner peripheral portion of the liquid retention chamber 97 to the outer peripheral portion of the tail portion 60 b of the base body 60.

  When the fluid chambers 61 and 62, the inlet channels 35 and 36, and the liquid supply path 80a are communicated in series as they are, unnecessary liquid flow occurs due to the liquid pressure from the liquid supply path 80a during pulsed droplet ejection. May occur. Therefore, as described in the second embodiment and the modification described above, by providing the liquid retention chamber 96 or the liquid retention chamber 97, the liquid filled in the liquid retention chambers 96 and 97 becomes a buffer portion, which is unnecessary. Generation of liquid flow can be suppressed.

On the other hand, during the pulsed droplet ejection, the liquid filled in the liquid retention chambers 96 and 97 becomes a resistance, and the reverse flow of the fluid from the inlet channels 35 and 36 can be suppressed. .
(Embodiment 3)

Next, the liquid ejecting unit according to the third embodiment will be described with reference to the drawings. The third embodiment is characterized in that each of a plurality of variable volume chambers is provided in the plane direction. A configuration in which two variable volume chambers are provided will be described as an example.
9A and 9B show a liquid ejecting unit according to the third embodiment, in which FIG. 9A is a plan view and FIG. 9B is a cross-sectional view showing the EE cut surface of FIG. In addition, (a) has illustrated the state which saw through the upper frame mentioned later. 9 (a) and 9 (b), the fluid ejecting unit 10 includes variable volume chambers 21 and 22 that are arranged in the plane direction.

The variable volume chamber 21 includes a fluid chamber 61 formed in the lower frame 69, a diaphragm 40 that seals the opening of the fluid chamber 61, and a piezoelectric element 51 provided on the upper surface of the diaphragm 40. The variable volume chamber 22 includes a fluid chamber 62 formed in the lower frame 69, a diaphragm 41 that seals the opening of the fluid chamber 62, and a piezoelectric element 52 provided on the upper surface of the diaphragm 41. . Since the configuration of each of the variable volume chambers 21 and 22 is the same as that of the first embodiment (see FIG. 2), detailed description thereof is omitted.
The diaphragms 40 and 41 can also be configured as a single body.

  After the variable volume chambers 21 and 22 are mounted on the lower frame 69, the fluid ejecting unit 10 is configured by closely fixing the upper frame 68 to the lower frame 69. At this time, a space 68 a is formed above the variable volume chambers 21 and 22.

  The outlet channels 30 and 31 and the inlet channels 35 and 36 are communicated with the fluid chambers 61 and 62, respectively. Connection pipes 71 and 72 are provided at the ends of the inlet channels 35 and 36, and liquid supply tubes 83 and 84 are fitted into the connection pipes 71 and 72, respectively. The connection channels 71a and 72a are connected to the inlet channels 71 and 72, respectively. It is connected to the paths 35 and 36.

Accordingly, since the fluid ejecting apparatus having such a configuration has a flat shape but has a plurality of fluid ejecting openings, by simply flattening the ejecting nozzle as in the above-described Patent Document 2, The problem that the area becomes wide and it is difficult to obtain sufficient excision pressure can be solved. Further, since the fluid can be ejected from each of the plurality of fluid openings at a high speed, it is possible to excise a long surgical line, thereby having an effect of enabling exfoliation other than an open operation. The liquid ejecting portion has a flat shape, and has side-by-side liquid ejecting openings, which makes it possible to cut a long surgical line. As a result, there is an effect that exfoliation and excision of the surgical site can be performed.
(Embodiment 4)

Next, a fluid ejecting apparatus according to Embodiment 4 will be described with reference to the drawings. The fourth embodiment is characterized in that a suction path is further provided with respect to the configurations of the first to third embodiments described above.
10A and 10B show a fluid ejecting section according to Embodiment 4, wherein FIG. 10A is a cross-sectional view showing a cut surface cut along the liquid flow direction, and FIG. 10B shows a FF cut surface of FIG. It is sectional drawing. 10 (a) and 10 (b), the fluid ejecting unit 10 is provided with a suction channel 92 that penetrates from the tip 60a of the base body 60 to the tail 60b.

  The suction channel 92 is provided at a substantially central portion in the cross-sectional direction of the base body 60, and has a cross-sectional area larger than the cross-sectional area perpendicular to the liquid flow direction of the outlet channels 30, 31 and the inlet channels 35, 36. . A suction opening 92 a is provided at the distal end of the suction flow path 92, and the other base end communicates with the suction tube 91.

  One end portion of the suction tube 91 is fitted into a tube fitting portion 60d protruding from the tail portion 60b of the base body 60, and the other end portion is inside the drive control unit 110 (see FIG. 1) or It is connected to an external suction device (not shown).

  A liquid supply tube 80 is fitted on the outer peripheral portion of the base body 60. A space constituted by the inner peripheral portion of the liquid supply tube 80 and the outer peripheral portion of the suction tube 91 is a liquid supply path 80a. The inlet channels 35 and 36 are communicated with the liquid supply path 80a, and the liquid is supplied to the fluid chambers 61 and 62.

  According to such a configuration, tissue excision by liquid ejection from the fluid ejection openings 30a and 31a, and residues and drainage generated by the excision can be aspirated from the suction path. Therefore, it is possible to perform the treatment while visually recognizing the surgical site. Since the suction channel 92 is formed in the base body 60, a fluid ejecting apparatus that is smaller than a configuration in which a water jet catheter and a drainage suction catheter are provided side by side as described in Patent Document 3 is realized. it can.

  As another configuration of the fluid ejecting unit 10 provided with the suction flow path 92, as in the first embodiment (see FIG. 2), the liquid supply tube 80 and the suction tube 91 are formed as an integral connection tube, It is good also as a structure which provides the liquid supply path 81 and 82 connected to the inlet flow paths 35 and 36, and the suction path connected to the suction flow path 92 in a connection tube.

  With such a configuration, a plurality of liquid supply paths and suction paths are formed in one connection tube, so that even if the plurality of liquid supply paths and suction paths are provided, the structure is small in diameter. A simple fluid ejecting unit 10 can be realized.

Moreover, the structure which provides the liquid retention chamber 96 or the liquid retention chamber 97 like Embodiment 2 and the modification (refer FIG.7, 8) mentioned above is also employable.
(Embodiment 5)

Subsequently, a fluid ejecting apparatus according to Embodiment 5 will be described with reference to the drawings. The fifth embodiment is characterized in that the first to fourth embodiments described above have a structure having more variable volume chambers than the structure having two variable volume chambers. Here, a structure having four variable volume chambers will be described as an example.
11A and 11B show an example of a fluid ejecting unit according to the fifth embodiment. FIG. 11A is a cross-sectional view taken along the liquid flow direction, and FIG. FIG. 4C is a cross-sectional view showing the BB cut surface of FIG. As shown in FIG. 11 (b), the fluid ejecting unit 10 is configured by disposing four variable volume chambers 21 to 24 in the circumferential direction of the outer peripheral side surface of the base body 60.

  As shown in FIGS. 11A and 11B, the variable volume chambers 21 to 24 are disposed in a recess formed at a position divided by 90 degrees on the outer peripheral portion of the columnar base 60. . The variable volume chamber 21 and the variable volume chamber 22, and the variable volume chamber 23 and the variable volume chamber 24 are disposed so as to face each other.

  The variable volume chamber 21 is fixed to the periphery of the upper opening of the fluid chamber 61, and includes a diaphragm 40 that hermetically seals the fluid chamber 61, and a piezoelectric element 51 provided on the surface of the diaphragm 40.

  The variable volume chamber 22 has the same configuration as the variable volume chamber 21, and includes a fluid chamber 62, a diaphragm 41, and a piezoelectric element 52. Similarly, the variable volume chamber 23 includes a fluid chamber 63, a diaphragm 42, and a piezoelectric element 53, and the variable volume chamber 24 includes a fluid chamber 64, a diaphragm 43, and a piezoelectric element 54. Each of the fluid chambers 61 to 64 communicates with the outlet channels 30, 31, 32, and 33 and the inlet channels 35, 36, 37, and 38 (see FIG. 11C).

  As shown in FIGS. 11A and 11C, connecting pipes 71 to 74 are planted in the tail portion 60b of the base body 60, and communicate with the inlet channels 35, 36, 37, and 38, respectively. . Further, connection flow paths 71 a, 72 a, 73 a, 74 a are opened in the connection pipes 71 to 74, respectively, and liquid supply paths 80 a to 80 d opened in the liquid supply tube 80 are fitted and connected, so that the liquid It communicates with the supply paths 80a to 80d. The variable volume chambers 21 to 24 are sealed by the lid cylinder 70, and spaces 21a, 22a, 23a, and 24a are formed above the variable volume chambers 21 to 24, respectively.

The configuration of the fifth embodiment can be adapted to a configuration including three variable volume chambers.
FIG. 12 is a longitudinal sectional view showing a configuration including three variable volume chambers. In FIG. 12, the fluid ejecting unit 10 is configured by disposing three variable volume chambers 21 to 23 in the circumferential direction of the outer peripheral side surface of the base body 60.

  The variable volume chambers 21 to 23 are arranged in a recess formed at a position divided by 120 degrees on the outer periphery of the columnar base 60. The variable volume chamber 21 is fixed to the periphery of the upper opening of the fluid chamber 61, and includes a diaphragm 40 that hermetically seals the fluid chamber 61, and a piezoelectric element 51 provided on the surface of the diaphragm 40.

  The variable volume chambers 22 and 23 have the same configuration as the variable volume chamber 21, and the variable volume chamber 22 includes a fluid chamber 62, a diaphragm 41, and a piezoelectric element 52. The variable volume chamber 23 includes a fluid chamber 63, a diaphragm 42, and a piezoelectric element 53. Each of the fluid chambers 61 to 63 communicates with the outlet channels 30, 31, 32 and the same number of inlet channels (not shown).

  In the configuration of the fifth embodiment described above, as in the first modification of the first embodiment described above (see FIG. 3), a structure including a liquid supply tube in each inlet channel and a structure including an outer tube As in the second modified example (see FIG. 4), a structure including one liquid supply tube communicating with each inlet channel can be employed.

  Further, as in the third modified example (see FIG. 5), there is a structure in which projecting portions corresponding to the respective outlet channels are provided at the distal end portion of the base body 60 and fluid ejection openings are provided in these projecting portions. Can be adapted.

  Further, as in the fourth modified example (see FIG. 6), there is a structure in which one inlet channel is provided, and a connecting channel communicating with each fluid chamber is branched from this inlet flow, or Embodiment 2 (FIG. 7). , 8), a structure in which a liquid retention chamber is provided between the inlet channel and the liquid supply tube can be adapted.

Thus, even if it is the structure provided with four or three variable volume chambers, the same effect as Embodiment 1 and 2 mentioned above is acquired.
Note that the configurations of the first and second embodiments described above can be adapted even if the configuration is such that five or more variable volume chambers are provided.
(Embodiment 6)

Next, a fluid ejecting apparatus according to Embodiment 6 will be described with reference to the drawings. The sixth embodiment is characterized in that a suction path is further provided to the above-described fifth embodiment. Here, a configuration including four variable volume chambers will be described as an example. The description will focus on the parts different from the fifth embodiment (see FIG. 11), and the same functional parts are denoted by the same reference numerals.
FIG. 13: shows the fluid injection part which concerns on Embodiment 6, (a) is sectional drawing cut | disconnected along the flow direction of a liquid, (b) is sectional drawing which shows the AA cut surface of (a), c) is a sectional view showing the BB cut surface of (a). 13A, 13 </ b> B, and 13 </ b> C, the fluid ejecting unit 10 is provided with a suction flow path 92 that penetrates the tail 60 b from the tip of the base body 60.

  The suction channel 92 is provided at a substantially central portion in the cross-sectional direction of the base body 60 and has a cross-sectional area larger than the cross-sectional area perpendicular to the liquid flow direction of the outlet channels 30 to 33 and the inlet channels 35 to 38. . A suction opening 92 a is provided at the tip of the suction channel 92.

  Each of the inlet flow paths 35 to 38 communicates with each of the liquid supply paths 80a to 80d opened in the liquid supply tube 80 via connection flow paths 71a, 72a, 73a and 74a opened in the connection pipes 71 to 74. Is done. The suction flow path 92 is connected to a suction path 80 e opened in the liquid supply tube 80 via a connection flow path 78 a opened in the suction connection pipe 78.

  The liquid supply paths 80a to 80d are connected to an infusion bag provided inside or outside the drive control unit 110 (see FIG. 1), and the suction path 80e is connected to a suction device provided inside or outside the drive control unit 110. Connected.

  In addition, it is good also as a structure which provides separately the liquid supply tube corresponding to each of the connection pipes 71-74, and the suction tube connected to the suction connection pipe 78, In this case, these liquid supply tubes and a suction tube are included. More preferably, the outer tube is provided.

  With such a configuration in which the suction channel 92 is provided, tissue excision by liquid ejection from the fluid ejection opening, and residues and drainage by tissue excision can be aspirated from the suction path. Since the suction path is formed in the base body, the water jet catheter and the drainage suction are provided as in Patent Document 3 described above even in the configuration in which three, four, or more variable volume chambers are provided. Compared with a configuration in which a catheter is provided, a fluid ejecting apparatus that is smaller in size can be realized.

  In the embodiment described above, each of the plurality of variable volume chambers and each of the plurality of variable volume chambers including the outlet flow path and the fluid ejection opening are described. However, depending on the driving method of the plurality of variable volume chambers. Various functions and effects can be realized.

  For example, in the fluid ejection device 100 in each of the above embodiments, if the configuration of the plurality of volume variable chambers and the drive timing of each of the plurality of volume variable chambers are matched, the liquid ejection speed and ejection of each fluid ejection opening portion The amount can be made the same, the fluid ejection amount as a whole can be increased, and the cutting ability can be enhanced.

  In this way, since the drive signals input to the plurality of variable volume chambers can be made common, and the configuration and dimensions of the plurality of variable volume chambers can be made the same, a drive control circuit for generating drive signals is provided. Including the structure can be simplified.

  Further, each of the plurality of variable volume chambers can be driven by shifting the drive timing. The configuration of the first embodiment (see FIG. 2) will be described as an example. The drive of the variable volume chambers 21 and 22 is driven by shifting the timing of drive signal input applied to the variable volume chamber 21 and the variable volume chamber 22. You can change the timing. Accordingly, since the resecting capability is smaller than that in the case where the timings described above are matched, it is possible to secure the field of view by washing the resecting portion with a fluid having weak resecting capability by performing such control. One can be used for main excision and the other for cleaning.

  In addition, the ejection speed and the ejection amount of the fluid ejected from at least one of the plurality of variable volume chambers can be set differently from the others. This can be realized by changing the dimensional configuration of the plurality of variable volume chambers, or by preparing a plurality of types of drive signal waveforms in advance and selectively changing the input drive signal waveforms.

  If it does in this way, according to the hardness and state of an excision part, it becomes possible to select and use a volume variable chamber (fluid injection opening) corresponding to an appropriate jetting speed and jetting quantity.

Furthermore, some of the plurality of variable volume chambers can be selectively driven.
In this way, a necessary variable volume chamber (fluid ejection opening) can be selected and used according to the hardness and range of the excision. In this case, one, a plurality, or all of the variable volume chambers may be selected.

  The combination of the drive timings of the variable volume chambers described above and the selection of the variable volume chamber to be driven are performed by adjusting the drive waveform generation circuit unit or the drive control circuit unit provided in the drive control unit 110 (see FIG. 1) with the adjusting device 112. Can be switched by operating.

FIG. 3 is an explanatory diagram illustrating an example of a schematic configuration of the fluid ejecting apparatus according to the first embodiment. The fluid injection part which concerns on Embodiment 1 is shown, (a) is sectional drawing cut | disconnected along the flow direction of a liquid, (b) is sectional drawing which shows the AA cut surface of (a), (c) is ( Sectional drawing which shows the BB cut surface of a), (d) is sectional drawing which shows a liquid supply tube. FIG. 9 is a partial cross-sectional view illustrating a fluid ejecting unit according to a first modification of the first embodiment. FIG. 6 is a cross-sectional view illustrating a fluid ejecting unit according to a second modification of the first embodiment. FIG. 6 is a cross-sectional view showing a fluid ejection unit according to a third modification of the first embodiment. It is sectional drawing which shows the fluid injection part which concerns on the 4th modification of Embodiment 1, (a) is sectional drawing cut | disconnected along the flow direction of a liquid, (b) is CC sectional surface of (a). FIG. It is sectional drawing which shows the fluid injection part which concerns on Embodiment 2, (a) is a fragmentary sectional view cut | disconnected along the flow direction of a liquid, (b) is sectional drawing which shows the DD cut surface of (a). FIG. 10 is a partial cross-sectional view illustrating a schematic configuration of a liquid ejecting unit according to a modification of the second embodiment. The liquid injection part which concerns on Embodiment 3 is shown, (a) is a top view, (b) is sectional drawing which shows the EE cut surface of (a). The fluid injection part which concerns on Embodiment 4 is shown, (a) is sectional drawing which shows the cut surface cut | disconnected along the flow direction of a liquid, (b) is sectional drawing which shows the FF cut surface of (a). An example of the fluid injection part which concerns on Embodiment 5 is shown, (a) is sectional drawing cut | disconnected along the flow direction of a liquid, (b) is sectional drawing which shows the AA cut surface of (a), (c ] Is sectional drawing which shows the BB cut surface of (a). The longitudinal cross-sectional view which shows the structure provided with three variable volume chambers. The fluid injection part which concerns on Embodiment 6 is shown, (a) is sectional drawing cut | disconnected along the flow direction of a liquid, (b) is sectional drawing which shows the AA cut surface of (a), (c) is ( Sectional drawing which shows the BB cut surface of a).

Explanation of symbols

  21, 22 ... variable volume chamber, 30, 31 ... outlet channel, 30 a, 31 a ... fluid ejection opening, 35, 36 ... inlet channel, 40, 41 ... diaphragm, 61, 62 ... fluid chamber, 80 ... liquid supply Tube, 81, 82 ... liquid supply path, 100 ... fluid ejection device.

Claims (17)

A columnar base having a plurality of recesses formed in the outer peripheral surface;
A plurality of variable volume chambers comprising a diaphragm for sealing each of the plurality of recesses, and a plurality of fluid chambers formed by the recesses and the diaphragm, respectively.
An outlet channel communicating with the side walls of each of the plurality of fluid chambers substantially parallel to the direction of displacement of the diaphragm;
A fluid ejection opening provided at the tip of the outlet channel;
An inlet channel communicating with each of the plurality of fluid chambers;
A fluid supply tube communicating with the inlet channel,
A fluid ejecting apparatus, wherein the volume of the fluid chamber is reduced by the diaphragm, and fluid is ejected in pulses from the fluid ejecting opening. The fluid ejection device according to claim 1,
The fluid ejecting apparatus, wherein each of the plurality of variable volume chambers is spaced apart in a circumferential direction of an outer peripheral side surface of the base. The fluid ejection device according to claim 1,
Each of the plurality of variable volume chambers is provided side by side in a planar direction. In the fluid ejection device according to any one of claims 1 to 3,
The fluid ejecting apparatus comprising the fluid supply tube communicating with each of the plurality of inlet flow paths. The fluid ejection device according to claim 4, wherein
A fluid ejecting apparatus, further comprising an outer tube that is fitted to an outer peripheral portion of the base body and encloses the fluid supply tube. The fluid ejection device according to claim 1,
The fluid ejecting apparatus according to claim 1, wherein the fluid supply tube communicates with the plurality of inlet flow paths and is fitted to an outer peripheral portion of the base so as to seal the plurality of variable volume chambers. In the fluid ejection device according to any one of claims 1 to 3,
The inlet channel common to the plurality of fluid chambers;
A fluid ejecting apparatus comprising a connection channel branched from the inlet channel and communicating with each of the plurality of fluid chambers. The fluid ejection device according to claim 1,
Each of the plurality of outlet flow paths communicates with a plurality of protrusions protruding from the tip of the base. The fluid ejection device according to claim 1,
The fluid ejecting apparatus, wherein the fluid supply tube has a plurality of fluid supply paths communicating with the plurality of inlet flow paths. The fluid ejection device according to claim 1,
A fluid ejecting apparatus, wherein a fluid retention chamber is provided between the inlet channel and the fluid supply path of the fluid supply tube. The fluid ejection device according to claim 1,
A suction channel penetrating from the tip of the base to the tail;
A fluid ejecting apparatus comprising a suction tube communicating with the suction channel. The fluid ejection device according to claim 1 or 11,
The fluid supply tube and the suction tube are formed as an integral connection tube,
The fluid ejecting apparatus according to claim 1, wherein a fluid supply path that communicates with the plurality of inlet flow paths and a suction path that communicates with the suction flow path are provided in the connection tube. The fluid ejection device according to claim 1,
The fluid ejecting apparatus according to claim 1, wherein the drive timings of the plurality of variable volume chambers coincide with each other. The fluid ejection device according to claim 1,
The fluid ejecting apparatus according to claim 1, wherein the drive timings of the plurality of variable volume chambers are shifted. The fluid ejection device according to claim 1,
A fluid ejecting apparatus, wherein ejection speeds and ejection amounts of fluid ejected from each of the plurality of variable volume chambers are equal. The fluid ejection device according to claim 1,
A fluid ejecting apparatus, wherein an ejecting speed and an ejecting amount of a fluid ejected from at least one of the plurality of variable volume chambers are different from others. The fluid ejection device according to claim 1,
A fluid ejecting apparatus that selectively drives some of the plurality of variable volume chambers.

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