JP2018157868A - Liquid injection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform easily pressure control in a pressure chamber, while avoiding abnormal rise of an injection pressure, even if a part of a plurality of nozzles is clogged.SOLUTION: A liquid injection device includes n pressure chambers for changing a liquid pressure, n nozzles provided corresponding to the n pressure chambers respectively, for injecting liquid having a changed pressure, and m(<n) pressure changing parts for changing each pressure in the n pressure chambers.SELECTED DRAWING: Figure 5

Description

  The present disclosure relates to a liquid ejecting apparatus.

  Patent Document 1 discloses a liquid ejecting apparatus including one pressure chamber and one ejection pipe connected to the pressure chamber. Four nozzles are formed at the tip of the spray tube.

  Patent Document 2 discloses a liquid ejecting apparatus including five ejection tubes, five pressure chambers corresponding to the five ejection tubes, and five piezoelectric elements corresponding to the five pressure chambers, respectively. Yes.

JP 2002-264088 A JP-A-2015-198762

  In the case of the technique disclosed in Patent Document 1, the fact that there are a plurality of nozzles contributes to the improvement of the resecting capability, but when a part of the plurality of nozzles is clogged, the pressure of the liquid ejected from a normal nozzle There was a problem that would become high. On the other hand, in the case of the technique disclosed in Patent Document 2, since the five piezoelectric elements operate independently, there is a problem that it is difficult to control the five piezoelectric elements.

  Based on the above, it is an object of the present disclosure to make it easy to change the pressure in the pressure chamber while avoiding an abnormal increase in the injection pressure even when some of the plurality of nozzles are clogged.

  One form of the present disclosure includes: n pressure chambers for changing the pressure of the liquid; and the n for ejecting the liquid having the changed pressure provided corresponding to each of the n pressure chambers. A liquid ejecting apparatus including: a plurality of nozzles; and m (<n) pressure changing units that change the pressure of the n pressure chambers. According to this aspect, it is possible to easily change the pressure in the pressure chamber while avoiding an abnormal increase in the injection pressure even if some of the plurality of nozzles are clogged. The reason why the injection pressure is prevented from becoming abnormally high is that n nozzles are provided corresponding to the n pressure chambers. That is, when some of the n nozzles are clogged, the pressure in the pressure chamber corresponding to the clogged nozzle does not affect the pressure of the liquid ejected from the normal nozzle. The reason why the pressure in the pressure chamber is easily changed is that the number of pressure changing portions is smaller than the number of pressure chambers.

  In the above aspect, the pressure changing unit may be the m piezoelectric elements, and the pressure of the n pressure chambers may be changed by expansion and contraction of the piezoelectric elements. According to this embodiment, the above embodiment can be realized with a simple structure by using the piezoelectric element.

  In the above embodiment, m is 1; at least two of the n pressure chambers are formed to have a rotationally symmetric property; and the one piezoelectric element has the rotationally symmetric property. You may arrange | position so that a center axis line may be crossed. According to this embodiment, the force of the piezoelectric element is distributed to the n pressure chambers with a good balance.

  In the above aspect, the n pressure chambers may be formed by covering one pressure chamber forming member provided with the n recesses with a single diaphragm. According to this mode, the above mode can be realized with a simple structure.

  The present disclosure can be realized in various forms other than the above. For example, it can be realized as a surgical handpiece or a medical device as a part of the liquid ejecting apparatus.

The schematic block diagram of a medical device. The perspective view of a handpiece. The side view of a handpiece. The side view of the member which forms the flow path of the liquid to be ejected. The perspective view of the member which forms the flow path of the liquid to be ejected. The figure which shows a some nozzle. The disassembled perspective view which shows a part of component of a drive part. The front view of a pressure chamber formation member. 9-9 sectional drawing shown by FIG. The front view of the pressure chamber formation member in the modification 1. FIG. The front view of the pressure chamber formation member in the modification 2. FIG. The figure which looked at the some nozzle in the modification 2 from the front.

  FIG. 1 schematically shows the configuration of the medical device 20. The medical device 20 is a medical device for realizing an operation using a liquid. The medical device 20 has a function of excising the affected part (living tissue) by ejecting liquid onto the affected part. For this reason, the medical device 20 is a liquid ejecting apparatus. The medical device 20 also has a function of sucking the ejected liquid and the excised living tissue.

  The medical device 20 includes a control device 30, an actuator cable 31, a pump cable 32, a foot switch 35, a suction device 40, a suction tube 41, a liquid supply device 50, and a handpiece 200. .

  The liquid supply apparatus 50 includes a water supply bag 51, a spike needle 52, first to sixth connectors 53a to 53f, first to fourth water supply tubes 54a to 54d, and first to third branch tubes 54e1 to 54e3. , A pump tube 55, a blockage detection mechanism 56, a filter 57, and a tube pump 60.

  The handpiece 200 includes an ejection tube group 205 and a suction tube 400. The injection tube group 205 is a general term for three injection tubes. The three injection tubes are the first injection tube 201, the second injection tube 202, and the third injection tube 203. These three pipes will be described later.

  The water supply bag 51 is made of a transparent synthetic resin, and is filled with a liquid (specifically, physiological saline). In addition, in this application, even if it fills with liquids other than water, it calls the water supply bag 51. FIG. The spike needle 52 is connected to the first water supply tube 54a via the first connector 53a. When the spike needle 52 is stabbed into the water supply bag 51, the liquid filled in the water supply bag 51 can be supplied to the first water supply tube 54a.

  The first water supply tube 54a is connected to the pump tube 55 via the second connector 53b. The pump tube 55 is connected to the second water supply tube 54b via the third connector 53c. The tube pump 60 sandwiches the pump tube 55 between the stator 60a and the rotor 60b. The tube pump 60 handles the pump tube 55 by rotating a plurality of rollers on the rotor by rotation of a built-in supply motor (not shown). By being handled in this way, the liquid in the pump tube 55 is sent out from the first water supply tube 54a side to the second water supply tube 54b side. In addition, rotating the supply motor is referred to as “driving the tube pump 60”.

  The blockage detection mechanism 56 detects the blockage of the flow paths in the second to fourth water supply tubes 54b to 54d and the handpiece 200 by measuring the pressure in the second water supply tube 54b. When detecting the blockage, the blockage detection mechanism 56 inputs the detection result to the control device 30.

  The second water supply tube 54b is connected to the third water supply tube 54c via the fourth connector 53d. A filter 57 is connected to the third water supply tube 54c. The filter 57 collects foreign matters contained in the liquid.

  The third water supply tube 54c is connected to the fourth water supply tube 54d through the fifth connector 53e. The fourth water supply tube 54d is connected to the sixth connector 53f. The sixth connector 53f is connected to the first to third branch tubes 54e1 to 54e3. The sixth connector 53f diverts the liquid flowing in from the fourth water supply tube 54d to the first to third diversion tubes 54e1 to 54e3.

  Each of the first to third flow dividing tubes 54e1 to 54e3 is connected to the handpiece 200. The liquid supplied to the handpiece 200 through the first to third flow dividing tubes 54e1 to 54e3 is intermittently ejected from a nozzle (described later) provided at the front end of the ejection tube group 205 by driving of a driving unit 300 (described later). Is done. In this way, the liquid is intermittently ejected, so that the resecting capability can be secured with a small flow rate. Thus, the ejection tube group 205 is a tube for ejecting a liquid for excising a living tissue to a site to be excised.

  The suction tube 41 is connected to the handpiece 200. The suction device 40 sucks the inside of the suction tube 400 through the suction tube 41. By this suction, the liquid near the front end of the suction tube 400, a cut piece, and the like are sucked.

  The control device 30 includes a CPU (Central Processing Unit) and a storage medium. A program for controlling the tube pump 60 and a piezoelectric element 340 (described later) included in the drive unit 300 is stored in the storage medium. The control device 30 transmits the first drive signal via the actuator cable 31 and the second drive via the pump cable 32 while the foot switch 35 is depressed by the CPU executing this program. Send a signal. In the present embodiment, the first drive signal has a periodicity of 400 Hz and drives the drive unit 300.

  The second drive signal drives the tube pump 60. Therefore, the liquid is intermittently ejected while the user steps on the foot switch 35, and the liquid ejection stops while the user does not step on the foot switch 35.

  FIG. 2 shows a perspective view of the handpiece 200. FIG. 3 shows a side view of the handpiece 200. The handpiece 200 includes an ejection tube group 205, a casing 210, screws 221, 222, and 223, a suction tube 400, and a suction force adjustment mechanism 500.

  The casing 210 is a member that is gripped by the user. The housing 210 is formed by coupling the first housing 210a and the second housing 210b. The casing 210 and the suction tube 400 are made of hard resin. The second housing 210b is fixed to the first housing 210a by fastening screws 221, 222, and 223.

  As described above, the injection tube group 205 includes the first injection tube 201, the second injection tube 202, and the third injection tube 203. Each of the first injection pipe 201, the second injection pipe 202, and the third injection pipe 203 is made of metal. FIG. 2 illustrates the front ends of the first injection pipe 201, the second injection pipe 202, and the third injection pipe 203. FIG. 3 shows the front ends of the first injection pipe 201 and the third injection pipe 203. The reason why the second injection pipe 202 is not shown in FIG. 3 is that the second injection pipe 202 overlaps the third injection pipe 203.

  The suction force adjustment mechanism 500 is a member for adjusting the suction force by the suction pipe 400. The user can adjust the suction force by the suction pipe 400 using the hole 522.

  As shown in FIGS. 2 and 3, two orthogonal coordinate systems based on the handpiece 200 are defined. The first is the X1-Y-Z1 coordinate system. The second is the X2-Y-Z2 coordinate system. The Y direction common to the two coordinate systems is a direction orthogonal to the boundary line between the first housing 210a and the second housing 210b, and the direction from the first housing 210a to the second housing 210b is a positive direction. . The boundary line here is a line appearing on the surface of the housing 210 as shown in FIG. However, in the definition of the Y direction, the boundary line near the connecting portion 10 is excluded. The connection unit 10 will be described later with reference to FIG.

  The X1 direction is a direction parallel to a predetermined straight line included in the boundary line, and the direction toward the opening end of the suction tube 400 is a positive direction. The predetermined straight line is a straight line appearing on both sides of the suction force adjusting mechanism 500. The Z1 direction is defined by the right hand system from the X1 direction and the Y direction.

  The X2 direction is the longitudinal direction of the suction tube 400, and the direction toward the opening end of the suction tube 400 is a positive direction. The Z2 direction is defined by the right hand system from the X2 direction and the Y direction.

  FIG. 4 is a side view of members that form the flow path of the liquid to be ejected in the handpiece 200. FIG. 5 is a perspective view of the member. FIG. 6 is a front view of a plurality of nozzles.

  The liquid in the first to third flow dividing tubes 54e1 to 54e3 flows in the X1 direction plus direction in the handpiece 200. The first branch tube 54e1 is connected to the first inlet channel tube 241. The second branch tube 54e2 is connected to the second inlet channel tube 242. The third branch tube 54e3 is connected to the third inlet channel tube 243.

  Each of the first to third inlet channel pipes 241 to 243 is connected to the pressure chamber forming member 310 of the drive unit 300. Each of the first to third inlet channel tubes 241 to 243 is curved in a U shape. The liquid that has flowed into the first to third inlet channel pipes 241 to 243 initially flows in the X1 direction plus direction, and after passing through the curved portion, flows in the X1 direction minus direction and flows into the driving unit 300. To do.

  The liquid that has flowed into the drive unit 300 is given pulsation by the drive of the drive unit 300. First to third injection pipes 201 to 203 are connected to the drive unit 300. The liquid that has flowed into the drive unit 300 from the first inlet channel pipe 241 flows into the first injection pipe 201. The liquid that has flowed into the drive unit 300 from the second inlet channel tube 242 flows into the second injection tube 202. The liquid that has flowed into the drive unit 300 from the third inlet channel tube 243 flows into the third injection tube 203.

  The first injection pipe 201 includes a first straight part 201a, a bending part 201b, a second straight part 201c, and an injection part 201d. The first straight part 201a is a part connected to the driving part 300, and extends straight along the X1 direction. The bending portion 201b is a portion disposed between the first straight portion 201a and the second straight portion 201c.

  The second straight part 201c is a part that is provided between the curved part 201b and the injection part 201d and extends straight along the X1 direction. The second straight portion 201c is located near the center of the first straight portion 201a by the curved portion 201b. The center here is the center of the drive unit 300 in the YZ1 plane.

  The injection unit 201d is a part including the nozzle 201e of the first injection tube 201. The ejection unit 201d is a part that extends straight. The ejection part 201d is formed so as to be bent with respect to the second straight part 201c in order to follow the bending of the handpiece 200.

  The second injection pipe 202 and the third injection pipe 203 have the same configuration as the first injection pipe 201 described above. For example, as shown in FIG. 6, the second injection tube 202 includes a nozzle 202e, and the third injection tube 203 includes a nozzle 203e, just like the first injection tube 201 includes a nozzle 201e.

  FIG. 7 is an exploded perspective view showing some of the components of the drive unit 300. FIG. 8 is a front view of the pressure chamber forming member 310. 9 is a cross-sectional view taken along the line 9-9 shown in FIG. However, FIG. 9 shows the components shown in FIG. 7 in addition to the pressure chamber forming member 310.

  As shown in FIGS. 7 and 9, the driving unit 300 includes one pressure chamber forming member 310, one diaphragm 320, one piston 330, and one piezoelectric element 340. The piezoelectric element 340 functions as a pressure changing unit that changes the pressure of each of a plurality of pressure chambers (described later).

  As described above, the first to third injection pipes 201 to 203 and the first to third inlet channel pipes 241 to 243 are connected to the pressure chamber forming member 310. As shown in FIGS. 8 and 9, the pressure chamber forming member 310 has a plurality of pressure chambers on the minus side in the X1 direction. The plurality of pressure chambers are first to third pressure chambers 311 to 313.

  As shown in FIGS. 8 and 9, the pressure chamber forming member 310 is provided with an inlet side through hole 311a and an outlet side through hole 311b. Each of the inlet side through hole 311a and the outlet side through hole 311b passes through the pressure chamber forming member 310 in the X1 direction. The opening on the minus side in the X1 direction formed by the penetration is located in the first pressure chamber 311.

  A first inlet channel tube 241 is connected to the inlet side through hole 311a. The 1st injection pipe 201 is connected to the exit side through-hole 311b. For this reason, the first pressure chamber 311 functions as a flow path from the first inlet flow pipe 241 to the first injection pipe 201. The second pressure chamber 312 and the second pressure chamber 313 have the same configuration as the first pressure chamber 311 described above.

  As shown in FIG. 9, the diaphragm 320 covers the pressure chamber forming member 310 on the minus side in the X1 direction. One diaphragm 320 seals the X1 direction minus side of each of the first to third pressure chambers 311 to 313.

  As shown in FIG. 7, the piston 330 includes first to third protrusions 331 to 333. In the YZ1 plane, the position of the first protrusion 331 corresponds to the position of the first pressure chamber 311. Similarly, the position of the second protrusion 332 corresponds to the position of the second pressure chamber 312, and the position of the third protrusion 333 corresponds to the position of the third pressure chamber 313.

  The piezoelectric element 340 periodically expands and contracts by a first drive signal input via the actuator cable 31. Expansion and contraction of the piezoelectric element 340 moves the piston 330 in the X1 direction. The movement of the piston 330 deforms the diaphragm 320. The deformation of the diaphragm 320 changes the respective volumes of the first to third pressure chambers 311 to 313. Changing the volume of each of the first to third pressure chambers 311 to 313 changes the internal pressure of each of the first to third pressure chambers 311 to 313. Since the expansion and contraction of the piezoelectric element 340 is periodic, this pressure change also occurs periodically. By periodically changing the pressure, the liquid is intermittently ejected from the nozzles 201e, 202e, and 203e.

  As shown in FIG. 9, the first pressure chamber 311 is a portion formed by denting the surface on the negative side in the X1 direction of the pressure chamber forming member 310. The same applies to the second pressure chamber 312 and the third pressure chamber 313.

  FIG. 8 shows the first to third pressure chambers 311 to 313 as circles. That is, the first to third pressure chambers 311 to 313 have a shape formed by cutting through a cylinder extending in the axis line O1, O2, O3 in the X1 direction. The first to third pressure chambers 311 to 313 are arranged so as to have a 120 ° symmetrical property. The 120 ° symmetrical property is specifically the property described below.

  As shown in FIG. 8, the axis lines O1, O2, and O3 of the first to third pressure chambers 311 to 313 are positioned on the virtual circle C in the YZ1 plane. The center Oc of the virtual circle C coincides with the center of the pressure chamber forming member 310. In the YZ1 plane, the virtual line segment connecting the center Oc of the virtual circle C and the axis O1 of the first pressure chamber 311 is the center of the virtual circle C, the second pressure chamber 312 axis O2, and the third pressure chamber. It has an angle of 120 ° with respect to an imaginary line segment connecting 313 axis O3. The centers of the inlet side through hole 311a and the outlet side through hole 311b are located on the imaginary line segment. Similarly, the centers of the inlet side through hole 312a and the outlet side through hole 312b, and the inlet side through hole 313a and the outlet side through hole 313b are located on the imaginary line segment. Since it has said characteristic, even if it rotates the 1st-3rd pressure chambers 311-313 by a 120 degree unit, a structure does not change.

  In FIG. 8, the outline formed by projecting the piezoelectric element 340 onto the YZ1 plane is indicated by a broken line. The closed region by the contour line includes the center Oc. That is, the piezoelectric element 340 is disposed so as to intersect the rotationally symmetric central axis. More specifically, the position of the center of gravity of the polygon as the contour line coincides with the position of the center Oc. That is, the piezoelectric element 340 is arranged so that the central axis of the piezoelectric element 340 and the rotationally symmetric central axis coincide. In addition, the said polygon in this embodiment is a square as shown in FIG.

  According to the embodiment described above, at least the following effects can be obtained.

  Since a plurality of nozzles are provided as the nozzles 201e, 202e, and 203e, a high excision ability can be realized.

  Even when one or two of the nozzles 201e, 202e, 203e are clogged, the first to third pressure chambers 311 to 313 are separated from each other, so that the pressure of the liquid ejected from the normal nozzle is abnormal. Highing is avoided.

  In order to change the pressures of the plurality of pressure chambers as the first to third pressure chambers 311 to 313, one piezoelectric element 340 may be controlled. For this reason, the control of the piezoelectric element 340 is not complicated.

  Since there is one diaphragm 320 and one piston 330, the force generated by the piezoelectric element 340 is easily transmitted evenly to the plurality of pressure chambers.

  Since the plurality of pressure chambers are arranged so as to have a rotationally symmetric property, and the center of the piezoelectric element 340 is arranged so as to coincide with the center Oc serving as the rotationally symmetric axis, it is generated in the piezoelectric element 340. Force is easily transmitted evenly to multiple pressure chambers.

  Since the inlet side through holes 311a, 312a and 313a are arranged on the outside and the outlet side through holes 311b, 312b and 313b are arranged on the inside, the first to third inlet channel pipes 241 to 243 and the first to third injections It becomes easy to arrange | position the pipes 201-203 in the handpiece 200. FIG. The inside here is the one closer to the center of the pressure chamber forming member 310 shown in FIG. 8, and the outside is the one far from the center.

  The present disclosure is not limited to the embodiments, examples, and modifications of the present specification, and can be realized with various configurations without departing from the spirit of the present disclosure. For example, the technical features in the embodiments, examples, and modifications corresponding to the technical features in the embodiments described in the summary section of the invention are to solve some or all of the above-described problems, or In order to achieve part or all of the effects described above, replacement or combination can be performed as appropriate. If the technical feature is not described as essential in this specification, it can be deleted as appropriate. For example, the following are exemplified.

  FIG. 10 is a front view of the pressure chamber forming member 610 in the first modification. The pressure chamber forming member 610 includes a plurality of pressure chambers. The plurality of pressure chambers are first to sixth pressure chambers 311 to 316. The first to third pressure chambers 311 to 313 have the same characteristics as the pressure chambers included in the pressure chamber forming member 310 described in the embodiment. The axis lines O4 to O6 of the fourth to sixth pressure chambers 314 to 316 are located on the virtual line circle C1. The virtual circle C1 and the virtual circle C are concentric circles. The diameter of the virtual circle C1 is longer than the diameter of the virtual circle C. The fourth to sixth pressure chambers 314 to 316 are arranged so as to have a 120 ° symmetrical property like the first to third pressure chambers 311 to 313. According to the first modification, the pressure chambers and the nozzles can be made six without increasing the driving unit 300 so much. As a result, the excision ability is further improved.

  FIG. 11 is a front view of the pressure chamber forming member 710 in the second modification. The pressure chamber forming member 710 includes a plurality of pressure chambers. The plurality of pressure chambers are first to third pressure chambers 711 to 713. As shown in FIG. 11, the axis lines O7 to O9 of the first to third pressure chambers 711 to 713 are arranged along the Y direction. That is, the first to third pressure chambers 711 to 713 are arranged along the Y direction as shown in FIG.

  FIG. 12 is a view of a plurality of nozzles in Modification 2 as viewed from the front. The nozzles 201e, 202e, 203e in Modification 2 are arranged along the Y direction. This is a result of the first to third injection tubes 201 to 203 being arranged along the Y direction by arranging the first to third pressure chambers 711 to 713 along the Y direction. By arranging the nozzles 201e, 202e, and 203e along the Y direction, it is possible to eject liquid over a wide range.

  Furthermore, the following modifications are mentioned.

  Any of a light maser, a laser, a heater, and the like may be used as the pressure changing unit. When using an optical maser or laser, the optical maser or laser is not mounted on the handpiece, and the electromagnetic waves emitted from the optical maser or laser installed outside the handpiece are transmitted to the pressure chamber in the handpiece by optical fiber. May be.

  The medical device 20 may be of a type that crushes a living tissue using ultrasonic waves, for example, as a device for performing an operation using a liquid. Even in such a medical device, the same configuration as that described in the embodiment is adopted for supplying the liquid from the ejection tube group 205 and sucking the liquid or the excised living tissue from the suction tube 400. Also good.

  At least one of the number of pressure chambers, the number of nozzles, and the number of pressure changing units may be changed. However, the number of pressure chambers and the number of nozzles are the same number (n), and the number of pressure change parts is m (<n).

  The shape of the first to third protrusions 331 to 333 provided on the piston 330 may not be circular. For example, a rectangle may be used.

In the embodiment, the configuration in which the liquid is intermittently ejected is employed, but a configuration having a function of ejecting the liquid continuously may be employed. For example, the structure which can selectively use intermittent injection and continuous injection may be sufficient. In order to perform continuous injection using the hardware configuration of the embodiment, only the tube pump may be driven in a state where the drive of the drive unit is stopped or lowered. In this configuration, intermittent spraying may be performed for excision and continuous spraying may be performed for cleaning.
Or the structure which can implement only continuous injection may be sufficient. In the case of this configuration, the ablation may be performed by continuous injection.

The liquid to be ejected may be pure water or a chemical solution.
There may be no configuration regarding suction.

DESCRIPTION OF SYMBOLS 10 ... Connection part, 20 ... Medical equipment, 30 ... Control apparatus, 31 ... Cable for actuator, 32 ... Cable for pump, 35 ... Foot switch, 40 ... Aspirator, 41 ... Suction tube, 50 ... Liquid supply device, 51 ... Water supply bag, 52 ... spike needle, 53a ... first connector, 53b ... second connector, 53c ... third connector, 53d ... fourth connector, 53e ... fifth connector, 53f ... sixth connector, 54a ... first water supply tube 54b ... second water supply tube, 54c ... third water supply tube, 54d ... fourth water supply tube, 55 ... pump tube, 56 ... blockage detection mechanism, 57 ... filter, 60 ... tube pump, 54e1 ... first branch tube, 54e2 ... 2nd shunt tube, 54e3 ... 3rd shunt tube, 60a ... Stator, 60b ... Rotor DESCRIPTION OF SYMBOLS 200 ... Handpiece, 201 ... 1st injection pipe, 201a ... 1st linear part, 201b ... Curve part, 201c ... 2nd linear part, 201d ... Injection part, 201e ... Nozzle, 202 ... 2nd injection pipe, 202e ... Nozzle , 203 ... third injection pipe, 203e ... nozzle, 205 ... injection pipe group, 210 ... housing, 210a ... first housing, 210b ... second housing, 221 ... screw, 222 ... screw, 223 ... screw, 241 ... first DESCRIPTION OF SYMBOLS 1 inlet channel pipe, 242 ... 2nd inlet channel pipe, 243 ... 3rd inlet channel pipe, 300 ... drive part, 310 ... pressure chamber formation member, 311 ... 1st pressure chamber, 311a ... inlet side through-hole, 311b: outlet side through hole, 312 ... second pressure chamber, 312a ... inlet side through hole, 312b ... outlet side through hole, 313 ... third pressure chamber, 313a ... inlet side through hole, 313b ... outlet side through hole, 314 4th pressure chamber, 315 ... 5th pressure chamber, 316 ... 6th pressure chamber, 320 ... Diaphragm, 330 ... Piston, 331 ... 1st protrusion, 332 ... 2nd protrusion, 333 ... 3rd protrusion, 340 ... Piezoelectric element, 400 ... suction pipe, 500 ... suction force adjusting mechanism, 711 ... first pressure chamber, 711a ... inlet side through hole, 711b ... outlet side through hole, 712 ... second pressure chamber, 712a ... inlet side through hole, 712b ... outlet Side through hole, 713 ... third pressure chamber, 713a ... inlet side through hole, 713b ... outlet side through hole, C ... virtual circle, O1 ... axis, O2 ... axis, O3 ... axis, O4 ... axis, O5 ... axis, O6 axis

Claims (5)

N pressure chambers for changing the pressure of the liquid;
The n nozzles provided to correspond to the n pressure chambers, respectively, for ejecting the liquid whose pressure is changed;
M (<n) pressure changing sections for changing the pressure of the n pressure chambers;
A liquid ejecting apparatus comprising: The liquid ejecting apparatus according to claim 1, wherein the pressure changing unit is the m piezoelectric elements, and changes the pressure of the n pressure chambers by expansion and contraction of the piezoelectric elements. M is 1;
At least two of the n pressure chambers are formed to have rotationally symmetric properties,
The liquid ejecting apparatus according to claim 2, wherein the one piezoelectric element is disposed so as to intersect with the rotationally symmetric central axis. The n pressure chambers are formed by covering one diaphragm with respect to one pressure chamber forming member provided with the n depressions. The liquid ejecting apparatus according to one item.   A medical device comprising the liquid ejecting apparatus according to any one of claims 1 to 4.

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