JP5838635B2 - Control device for liquid ejection device - Google Patents

Description

  The present invention relates to a technique for ejecting liquid from an ejection port.

  In recent years, a surgical technique has been developed in which a biological tissue is excised by the pressure of a liquid by pressurizing a liquid such as water or physiological saline and spraying it on an operation site during surgery. In the liquid ejecting apparatus used for such surgery, the liquid is ejected from the ejection port provided at the tip of the nozzle, and the operator ejects the liquid toward the surgical site by the nozzle ejection port, It is possible to remove the biological tissue of the surgical site.

  In addition, when the liquid ejected from the ejection port accumulates around the surgical site, for example, the surgical site is difficult to see, and it is difficult to remove biological tissue at a desired position, or the momentum of the ejected liquid is It is weakened by the fluid collected in the blood and blood collected in the surgical site by excision, and the excision power is weakened. Further, the excised biological tissue (excised tissue) is scattered by the ejected liquid, and for example, the excised malignant tumor may reach other biological tissues other than the surgical site and have an adverse effect. Therefore, a suction port connected to a suction pump is provided in the vicinity of the ejection port, and when the ejection port is brought close to the surgical site, liquid, ablated tissue, or blood collected in the surgical site is sucked from the suction port. A technique for avoiding such adverse effects has been proposed (see, for example, Patent Document 1).

JP-A-6-90957

  However, according to the proposed technique, depending on the situation of the surgical site, the biological tissue may be absorbed by sucking in the biological tissue that has not been excised along with the fluid and blood collected around the surgical site or the excised tissue. There is a risk of hurting. However, if the suction amount is suppressed to avoid damage to the biological tissue, the liquid ejected from the ejection port and the excised tissue cannot be sufficiently aspirated, and the above-described adverse effects may occur.

  The present invention has been made to solve the above-described problems of the prior art, and is necessary for aspirating the liquid ejected from the ejection port, the blood accumulated in the surgical site, and the excised biological tissue. An object of the present invention is to provide a technique capable of reducing suctioning and damaging a biological tissue that has not been excised while securing the amount of suction.

  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 liquid ejecting apparatus according to this application example is a liquid ejecting apparatus that excises a biological tissue by ejecting liquid from an ejection port toward a biological tissue, and the liquid is ejected from the ejection port. Liquid ejecting means for ejecting in the form of a pulsating flow from, and suction means for periodically aspirating negative pressure to suck at least one of the ejected liquid and the excised biological tissue, The suction means periodically repeats suction and suction stop, and the suction means sucks the liquid while the liquid is not ejected from the ejection port.

  According to this application example, the biological tissue in the surgical site is excised by the pressure of the liquid ejected from the ejection port. Further, the liquid accumulated in the operation site and the excised biological tissue by being ejected in this manner are sucked by the suction means. The suction means can periodically vary the suction negative pressure when sucking the liquid in the surgical site.

  In this application example, “periodically changing the suction negative pressure” means changing the suction negative pressure in a manner in which a high negative pressure and a low negative pressure are periodically repeated. Therefore, the mode in which the suction negative pressure is “periodically changed” is not limited to a mode in which a high negative pressure value and a low negative pressure value are alternately repeated, but between a high negative pressure value and a low negative pressure value. A mode in which the negative pressure value continuously varies is also included.

  When a liquid is sucked with a predetermined suction negative pressure, the suction negative pressure can only be set according to the amount of liquid to be sucked, and the conditions for sucking the liquid (suction negative pressure here) can be freely changed. It is gone. On the other hand, if the suction negative pressure is changed periodically, the suction conditions such as the suction negative pressure value and the suction negative pressure change cycle can be changed. Even if the biological tissue is about to be sucked in, it is possible to perform suction under appropriate conditions that do not cause the biological tissue to be sucked in while securing a necessary suction amount by changing the suction conditions. In particular, the situation of the surgical site where the liquid is ejected is not uniform, and the optimum suction conditions are considered to be different. Therefore, by suctioning while periodically changing the suction negative pressure, it is possible to greatly increase the degree of freedom of selection of suction conditions, and as a result, it is possible to select optimal suction conditions according to the surgical site It becomes.

  In addition, when aspirating the liquid in the surgical site, it is only necessary to periodically control whether the liquid is aspirated or stopped, so that the negative pressure is varied by a plurality of negative suction pressures. In comparison, the control and mechanism for changing the suction negative pressure can be simplified. Further, in a situation where biological tissue is easily sucked, damage to the biological tissue may not be sufficiently avoided simply by reducing the suction negative pressure. For example, in a situation where the surgical site is complicated and suction negative pressure tends to act on the biological tissue, inhalation of the biological tissue may not be avoided only by weakening the suction force. In such a situation, it is possible to avoid the inhalation of the biological tissue by sucking the liquid while repeating the sucking state and the non-sucking state.

  Further, the suction is performed while the liquid is not ejected from the ejection port. This is because if the suction is started simultaneously with the liquid jet or before the jet, the living tissue is sucked by the suction means and deformed, so that a desired part may not be excised.

  Application Example 2 In the liquid ejecting apparatus according to the application example described above, the suction unit is configured to start the suction after an arbitrary delay time has elapsed since the start of the injection, and to start the next injection after the injection The suction is terminated before time.

  According to this application example, the suction starts suction after an arbitrary delay time has elapsed since the start of liquid ejection. Specifically, the suction is started after the liquid injection is finished and the living tissue is broken. When the suction is started simultaneously with the liquid jet or before the jet, the living tissue is sucked by the suction means and deformed, so that there is a possibility that a desired part cannot be excised. In addition, the suction ends the suction any time before the next liquid is ejected. When the suction is completed simultaneously with the liquid jet or after the jet, the living tissue is sucked by the suction means and deformed, so that a desired part may not be excised.

  Application Example 3 In the liquid ejecting apparatus according to the application example described above, the suction time tc of the suction unit is TA as the suction cycle of the suction, and a time delay from the start of the spraying to the start of the suctioning. When t1, the expression tc <TA−t1 is satisfied.

  According to this application example, suction can be intermittently performed between the ejection of a liquid and the ejection of the next liquid. By intermittently performing suction between the ejection of the liquid and the subsequent ejection of the liquid, when performing an operation for excising the biological tissue, the tissue can be excised without being attracted.

  Application Example 4 In the liquid ejecting apparatus according to the application example, the liquid ejecting unit is jetted from the ejection amount acquiring unit that acquires information on the amount of liquid ejected from the ejection port and the acquired ejection port. And a suction condition setting means for setting a suction condition based on information on the amount of liquid to be stored.

  According to this application example, ejecting the liquid “in the form of a pulsating flow” means that the liquid is ejected in a state in which the flow rate or flow velocity of the ejected liquid is fluctuated. Therefore, the mode of ejecting the liquid in the form of the pulsating flow includes intermittent ejection in which the liquid is ejected while being repeatedly ejected and stopped. However, since the liquid flow rate or flow velocity may be changed, the intermittent ejection is not necessarily performed. Need not be.

  The suction amount of the liquid to be sucked is increased or decreased in conjunction with the ejected liquid amount. Therefore, if the suction condition is set based on the information on the amount of liquid ejected, even if the liquid is ejected in a state where the flow rate or flow velocity of the liquid is fluctuated by ejecting the liquid in the form of a pulsating flow, The liquid can be appropriately sucked according to the change in the ejection amount.

  Application Example 5 In the liquid ejecting apparatus according to the application example described above, a maximum negative pressure setting unit that sets a maximum negative pressure that is a maximum value of the suction negative pressure is provided.

  According to this application example, the maximum negative pressure of the suction negative pressure directly determines the force for sucking the biological tissue, and can also intuitively grasp the effect of changing the setting. Therefore, by setting the maximum negative pressure of the suction negative pressure, it is possible to easily set an appropriate suction condition.

  Application Example 6 In the liquid ejecting apparatus according to the application example, the liquid ejecting apparatus includes a suction period setting unit that sets a suction period that is a period in which the suction negative pressure is larger than a predetermined negative pressure within the suction cycle. And

  According to this application example, the suction period is also one of the suction conditions that affect the ease of sucking the biological tissue, similar to the maximum negative pressure and the suction cycle described above. Therefore, by setting the suction period, it is possible to easily set appropriate suction conditions.

Explanatory drawing which showed the rough structure of the liquid-jet apparatus of a present Example. Explanatory drawing which showed the structure of the injection mechanism provided in the liquid injection apparatus of a present Example. Explanatory drawing which showed the structure for the liquid injection apparatus of a present Example to attract | suck liquid etc. FIG. The flowchart which showed the suction mechanism drive process which the suction control part of a present Example performs. Explanatory drawing which showed a mode that a negative pressure was provided to a suction opening as a result of performing the suction mechanism drive process of a present Example. Explanatory drawing which showed a mode that the suction conditions of a liquid changed by determining the parameter by the side of the suction of a present Example to arbitrary values. Explanatory drawing which illustrated a mode that the damage of a biological tissue was suppressed when suck | inhaling the liquid of an operation part using the liquid injection apparatus of a present Example. Explanatory drawing which showed the rough structure of the liquid-jet apparatus of a 2nd modification.

Hereinafter, in order to clarify the contents of the present invention described above, examples will be described in the following order.
A. Device Configuration B. C. Suction mechanism drive processing of this embodiment Modified example

A. Device Configuration FIG. 1 is an explanatory diagram showing a rough configuration of a liquid ejecting apparatus of the present embodiment. As shown in the figure, the liquid ejecting apparatus 10 of the present embodiment includes a liquid tank 140 in which liquids such as physiological saline and chemicals are stored, a suction pump 130 that sucks up liquid from the liquid tank 140, and a suction pump An injection mechanism (liquid injection means) 100 that pressurizes the liquid sucked up by 130 and sends it to the channel tube 120, a suction mechanism (suction means) 150 for sucking the liquid injected by the liquid injection device 10, and the like A control unit 160 that controls the operation of the ejection device 10, a control switch 170 that operates the start and completion of liquid ejection by the user, and the like.

  The liquid pressurized by the ejection mechanism 100 is ejected from the ejection port 122 provided at the distal end of the flow channel tube 120 through the flow channel tube 120 to the surgical site of the living body. Can be excised. In addition, if the ejected liquid or the like is left as it is, the visibility of the excision and the surgical site is hindered. Therefore, a suction port (not shown) is provided in the vicinity of the ejection port 122. The suction port is connected to the above-described suction mechanism 150, and by driving the suction mechanism 150 to apply a negative pressure to the suction port, the liquid or biological tissue ejected from the ejection port 122 to the surgical site is excised. It is possible to suck the blood that has come out and the excised biological tissue (excised tissue) from the suction port.

The operation of ejecting the liquid by the liquid ejecting apparatus 10 or the operation of sucking the liquid is controlled by the control unit 160. As shown in FIG. 1, the control unit 160 of the present embodiment includes an ejection control unit (ejection amount acquisition unit) 161 that controls an operation of ejecting the liquid by the liquid ejecting apparatus 10, and the liquid ejecting apparatus 10. A suction control unit (suction condition setting means) 165 that controls the operation of sucking the liquid is provided. The ejection control unit 161 is connected to the suction pump 130 and the ejection mechanism 100, and the suction control unit 165 is a suction unit. It is connected to the mechanism 150.
The control switch 170 is connected to the control unit 160. While the control switch 170 is ON, the liquid is continuously ejected from the ejection port by the ejection mechanism 100 at a constant cycle (or by increasing or decreasing the flow rate or flow velocity of the ejected liquid) and at the same time by the suction mechanism 150. The liquid is continuously sucked from the suction port at regular intervals.

  The ejection control unit 161 controls the suction pump 130 to change the amount of liquid supplied to the ejection mechanism 100 and also controls the ejection mechanism 100 to change the conditions under which the ejection mechanism 100 ejects liquid. In addition, the ejection mechanism 100 ejects liquid intermittently (or by increasing or decreasing the flow rate or flow rate of the liquid to be ejected). Correspondingly, the ejection control unit 161 ejects the liquid supply amount setting dial 162 for setting the amount of liquid supplied to the ejection mechanism 100 by the suction pump 130 and the ejection mechanism 100 at one time. An injection amount setting dial 163 for setting the liquid amount and an injection cycle setting dial 164 for setting the injection cycle are provided.

  In addition, the suction mechanism 150 intermittently sucks liquid from the suction port, and the suction control unit 165 determines the magnitude of the negative pressure during suction, the suction cycle, and the time during which suction is continued (suction time). I have control. Corresponding to this, the suction controller 165 has a suction negative pressure setting dial (maximum negative pressure setting means) 166 for setting the suction negative pressure, and a suction time setting dial (suction period setting means) for setting the suction time. 168. As will be described in detail later, the suction time is limited by the liquid ejection period and the delay time for starting the suction after the liquid is ejected, and the user performs the setting within a predetermined range.

  The suction mechanism 150 periodically repeats suction and suction stop. The suction cycle is synchronized with the injection cycle with a delay time. The suction mechanism 150 performs suction while the liquid is not ejected from the ejection port 122. The suction mechanism 150 starts suction after an arbitrary time has elapsed since the start of injection. The suction mechanism 150 ends the suction any time before the next injection starts.

  The suction control unit 165 is provided with two setting dials (a suction negative pressure setting dial 166 and a suction time setting dial 168). However, the operator of the liquid ejecting apparatus 10 always sets these two setting dials. There is no need to operate. As will be described in detail later, the operator can operate only one setting dial arbitrarily selected from the two setting dials. When one setting dial is operated, the remaining one setting is determined automatically. Is done. Therefore, each setting dial is provided with a selection switch. That is, the suction negative pressure setting dial 166 is provided with a suction negative pressure selection switch 166s, and the suction time setting dial 168 is provided with a suction time selection switch 168s. When changing the conditions under which the suction mechanism 150 sucks the liquid, the operator selects one of the selection switches 166s and 168s that is desired to be set and turns it on. Operate the setting dial corresponding to the switch. In this way, the set value of the operated setting dial can be reflected in the suction conditions.

  Further, in the liquid ejecting apparatus 10 of the present embodiment as described above, the following ejecting mechanism 100 is employed so that a large excision force can be obtained by ejecting liquid at a high pressure.

  FIG. 2 is an explanatory diagram showing the configuration of the ejection mechanism 100 provided in the liquid ejection apparatus 10 of the present embodiment. As shown in FIG. 2A, the injection mechanism 100 includes a supply flow path 102 to which liquid is supplied by the suction pump 130, and a pressurizing chamber in which the liquid supplied from the suction pump 130 is filled. 104, an ejection flow path 106 through which liquid is pushed out from the pressurizing chamber 104 toward the flow path pipe 120, and the like. A piezo element 110 is connected to the pressurizing chamber 104 via a film member (so-called diaphragm) 112. A voltage is applied to the piezo element 110 to expand and contract the piezo element, thereby driving the film member 112. The volume in the pressurizing chamber 104 can be changed.

  When injecting the liquid, first, as shown in FIG. 2A, a voltage is applied to the piezo element 110 to contract the piezo element 110 and expand the volume of the pressurizing chamber 104. At this time, since the liquid is supplied to the pressurizing chamber 104 by the suction pump 130, when the volume of the pressurizing chamber 104 is increased, the pressurizing chamber 104 is filled with the liquid. Subsequently, as shown in FIG. 2B, the piezo element 110 is extended to compress the pressurizing chamber 104. At this time, the pressure chamber 104 is connected to two flow paths, ie, the injection flow path 106 and the supply flow path 102, but these flow paths are formed narrow, so that the piezo element 110 causes the pressure chamber to be compressed. By compressing 104, the pressure of the fluid in the pressurizing chamber 104 can be sufficiently increased. Due to this pressure, the liquid in the pressurizing chamber 104 is strongly pushed out in the direction of the ejection flow path 106, and as a result, the liquid can be ejected vigorously from the ejection port 122 connected to the ejection flow path 106. The liquid in the pressurizing chamber 104 is pushed out not only to the ejection flow path 106 but also to the supply flow path 102, but the ease of liquid flow into each flow path (so-called inertance) depends on the length of the flow path and the flow path. Since it is determined by the cross-sectional area and the like, the amount of liquid flowing into the supply flow path 102 is less than the amount of liquid flowing into the injection flow path 106 if the lengths and cross-sectional areas of the supply flow path 102 and the injection flow path 106 are appropriately set. Can be suppressed. As a result, most of the liquid in the pressurizing chamber 104 can be pushed out to the ejection channel 106 and ejected from the ejection port 122 connected to the ejection channel 106 at a high speed.

  After the liquid is thus ejected, the piezo element is contracted again (see FIG. 2A), and then the piezo element 110 is expanded (see FIG. 2B), so that the liquid is ejected again. Can do. By repeating these operations, in the liquid ejecting apparatus 10 of the present embodiment, it is possible to repeatedly eject liquid droplets vigorously, and a high pressure when the vigorously ejected liquid droplets collide with an object. To improve the ability to excise biological tissue.

  In addition, when the biological tissue in the surgical site is excised by jetting the liquid in this way, the surgical site becomes difficult to see due to accumulation of liquid, blood, and excised tissue in the surgical site, or the liquid collected in the surgical site May interfere with the ability to cut biological tissue. Therefore, in the liquid ejecting apparatus 10 of the present embodiment, the liquid or the like accumulated in the surgical site is sucked by the following configuration.

  FIG. 3 is an explanatory diagram illustrating a configuration for the liquid ejecting apparatus 10 of the present embodiment to suck liquid or the like. As shown in FIG. 3A, a plurality of suction ports 124 are provided in the vicinity of the injection port 122 provided at the tip of the flow channel tube 120. It arrange | positions so that the injection port 122 may be surrounded centering on the port 122 (refer FIG.3 (B)). Further, the plurality of suction ports 124 are disposed away from the injection port 122 toward the injection mechanism 100 so as to be on the side surface of the flow channel tube 120. Furthermore, the flow path pipe 120 of the present embodiment is formed in a double-pipe structure, and the inside of the inner pipe is an injection flow path 106 that connects the injection mechanism 100 and the injection port 122. A region sandwiched between the tube and the outer tube is a suction channel 126 that connects the suction port 124 and the suction mechanism 150.

  The suction channel 126 is connected to the suction pump 154 through the opening / closing valve 152 in the suction mechanism 150, and the opening / closing valve 152 is opened and closed in a state where the suction pump 154 is operated. Whether or not to apply the negative pressure generated in 154 to the suction port 124 can be switched.

  In the liquid ejecting apparatus 10 of this embodiment having such a configuration, when sucking the liquid or the like accumulated in the surgical site, the suction pump 154 of the suction mechanism 150 is operated with the ejection port 122 approaching the surgical site. Let Then, a negative pressure is applied to the suction port 124 (see FIG. 3B) arranged around the ejection port 122, so that the liquid or the like accumulated around the ejection port 122 (that is, the surgical site) is aspirated. Is done.

  Here, in order to avoid accumulation of liquid etc. around the surgical site, it is necessary to aspirate the ejected liquid, the blood that comes out when the biological tissue is excised, and also the excised tissue. It is required to secure a sufficient suction amount when sucking liquid or the like. However, if the force for sucking the liquid or the like is too strong, there is a risk that the biological tissue that has not been excised together with the liquid or the like that has accumulated around the surgical site will be sucked and damaged. In order to avoid such a situation, it is possible to suppress the suction force of liquid etc. and make it difficult to suck biological tissue, but with this, it will not be possible to sufficiently suck the liquid etc. sprayed to the surgical site, eventually, There may be a problem that liquid or the like accumulates in the surgical site and the surgical site becomes difficult to see, or the excision ability of the liquid ejecting apparatus 10 is reduced. Therefore, in the liquid ejecting apparatus 10 of the present embodiment, in order to avoid the two problems described above, the liquid or the like accumulated in the surgical site is sucked by the following method.

B. FIG. 4 is a flowchart showing a suction mechanism drive process executed by the suction control unit 165 of this embodiment. As described above, the suction control unit 165 of the present embodiment is connected to the injection control unit 161 (see FIG. 1), and the suction control unit 165 has the control switch 170 turned on via the injection control unit 161. By grasping this fact, the suction mechanism driving process shown below is started.

  When the suction mechanism driving process is started, first, parameters on the ejection side are acquired from the ejection control unit 161 (step S100). Here, the parameters on the ejection side are values set by the liquid supply amount setting dial 162, the ejection amount setting dial 163, and the ejection cycle setting dial 164 of the ejection control unit 161 described above with reference to FIG. is there. Since the injection control unit 161 and the suction control unit 165 are connected to each other, the suction control unit 165 can acquire parameters on the injection side via the injection control unit 161.

  Subsequently, parameters on the suction side are acquired (step S102). Here, the parameters on the suction side are values set by the suction negative pressure setting dial 166 and the suction time setting dial 168 of the suction control unit 165 described above with reference to FIG. Further, as described above, these two setting dials 166 and 168 only need to be able to set two selected by the operator. When one parameter is set, the remaining parameters are automatically determined. Therefore, when acquiring the parameters on the suction side, the parameters “selected” are acquired by the selection switches 166s and 168s (step S102).

  When the “selected” parameter on the suction side is acquired in this way (step S102), the parameter not selected by the operator from the injection-side parameter acquired in step S100 and the two suction-side parameters acquired in step S102. Is determined (step S104). Here, the reason why the remaining parameters (unselected parameters) are determined from one parameter selected by the operator is as follows.

  First, the parameters on the ejection side acquired in step S100 of the suction mechanism driving process are the amount of liquid that the suction pump 130 supplies to the ejection mechanism 100, the amount of liquid that the ejection mechanism 100 ejects at one time, the ejection mechanism 100, and the like. The amount of liquid ejected by the liquid ejecting apparatus 10 within an arbitrary time can be determined by acquiring these ejection-side parameters. In addition, in order to prevent liquid from accumulating in the surgical site, it is only necessary to suck in the liquid that has been ejected, as well as blood that has been ejected when the biological tissue is resected by ejecting the liquid, as well as the resected tissue. . Therefore, by determining the amount of liquid ejected within an arbitrary time, the amount of liquid or the like to be sucked within an arbitrary time is determined in conjunction with the amount of liquid ejected. The amount of liquid or the like to be sucked within an arbitrary time can be derived from the amount of liquid ejected at an arbitrary time. In addition, since the amount of excised tissue and the amount of blood produced by excision vary depending on the state of the surgical site, it is desirable that the operator can adjust the amount of liquid or the like to be aspirated within an arbitrary time.

  On the other hand, when two parameters (suction negative pressure, suction time) on the suction side are determined, the suction amount is determined. Therefore, under the conditions where the parameters on the ejection side are determined and the amount of liquid to be ejected is determined, the amount of liquid to be aspirated within an arbitrary time is also determined. When the operator sets one parameter, the remaining parameters are determined. The set value of one parameter is determined to a certain value from the necessary suction amount. This point will be supplementarily described below.

  First, it is assumed that the suction time is selected from two parameters (suction negative pressure, suction time) on the suction side and set to a desired value. Since the suction amount in the suction cycle is determined based on the injection amount, the suction negative pressure is determined from the suction time. For example, when the suction time in the cycle is set to a relatively long time, the suction negative pressure can be set to a relatively low value. Conversely, when the suction time in the cycle is set to a relatively short time, the suction negative pressure is set to a relatively high value.

  In step S104 of the suction mechanism driving process shown in FIG. 4, a process of determining the remaining “unselected” parameters from the two parameters selected by the operator is performed as described above. When the two parameters on the suction side (suction negative pressure and suction time) are all determined in this way, the suction mechanism 150 is driven based on the parameters on the suction side (step S106).

  Subsequently, it is determined whether or not the liquid ejecting apparatus 10 ends the suction of the liquid (step S108). In the liquid ejecting apparatus 10 of the present embodiment, the control switch 170 is turned OFF, and the intermittent liquid sucking operation is completed at the same time as the intermittent liquid ejecting operation is completed. Therefore, in step S108, a signal from the control switch 170 is acquired, and the completion of the intermittent suction operation is determined (step S108).

  FIG. 5 is an explanatory diagram showing a state in which a negative pressure is applied to the suction port 124 as a result of performing the suction mechanism driving process of the present embodiment. In the initial state, the control switch 170 that controls the injection is OFF, and the injection and suction are stopped.

First, when the operator turns ON the control switch 170, the liquid is intermittently supplied from the injection port 122 at the cycle set by the jet cycle setting dial 164 (or the flow rate or flow velocity of the jetted liquid is increased or decreased). It continues to be injected.
The lower diagram of FIG. 5 shows a state in which liquid is intermittently ejected from the ejection nozzle at a period TA set by the ejection period setting dial 164 when the control switch 170 is ON, and liquid ejection with a time delay t1. It is the figure which drew in detail the mode that it attracts | sucks intermittently with the same period TA as a period.
When the liquid is ejected from the nozzle, suction is started after elapse of a time delay t1, which is an arbitrary value. Then, after the set suction time tc elapses, the suction is finished.
At this time, the suction time tc that can be set by the user with the suction time setting dial 168 must satisfy at least tc <TA−t1. In this way, suction can be intermittently performed between the liquid jet and the next liquid jet. By performing intermittent suction between the ejection of the liquid and the subsequent ejection of the liquid, a great effect is exhibited when performing an operation for excising the biological tissue. This point will be described below.

First, since the biological tissue to be excised is generally easily deformed, it is conceivable that when suction is performed, the tissue is attracted to the suction port and deformed. In this case, if the suction is started at the same time as the liquid ejection is started, the portion aimed by the user before the liquid ejection is deformed, and as a result, the excision of the portion assumed by the user is not performed efficiently. there is a possibility.
Therefore, by setting the time delay t1, suction is not performed until the ejected liquid reaches the ablation target, so that there is no deformation of the tissue due to suction, and the site as intended by the user is removed. It can be excised.
In addition, by setting tc <TA−t1, the suction can be completed between the ejection of the liquid and the subsequent ejection, so that the tissue is not deformed by the suction before the liquid is ejected, It is possible to excise a site as intended by the user.

Note that the suction may simply repeat a high negative pressure value and a low negative pressure value alternately, or even if the negative pressure value continuously fluctuates between a high negative pressure value and a low negative pressure value. Good. Further, at the start of suction, the negative pressure value may increase slowly continuously or stepwise.
Here, as described above, in the liquid ejecting apparatus 10 of the present embodiment, two parameters out of the two suction side parameters (suction negative pressure, suction time) can be set to arbitrary values. By determining the value of one parameter, it is possible to change the conditions for sucking the liquid as shown below.

  FIG. 6 is an explanatory diagram showing how the suction conditions of the liquid and the like change by determining the suction-side parameters of this embodiment to arbitrary values. The suction cycle is the same as the liquid ejection cycle, and is the same under the two suction conditions. In addition, with respect to the two suction conditions in FIG. 6, the amount of liquid or the like to be sucked is not changed.

  The left side of FIG. 6 shows the suction conditions in the case of the suction negative pressure (Va) and the suction cycle (TA) (indicated in the figure as before change). Under this condition, since the suction negative pressure Va is a relatively high value, the suction time is shortened to satisfy the determined suction amount. As a result, the suction conditions are such that the cycle of suction with a high negative pressure is repeated in a short time. On the other hand, the right side of FIG. 6 shows the suction conditions when the suction cycle TA is determined to be a suction negative pressure (Vb) lower than before the change (in the figure, the suction negative pressure is changed). After and display). Under this condition, since the suction negative pressure Vb is lower than the negative pressure Va, the suction time is longer to satisfy the determined suction amount. As a result, compared to the suction conditions shown before the change, it is possible to change the suction conditions so that the cycle of suction with a low negative pressure is repeated for a long time.

  As described above, in the liquid ejecting apparatus 10 of the present embodiment, the suction condition for sucking the liquid or the like can be changed by determining the suction negative pressure to an arbitrary value. In addition to the example shown in FIG. 6, the value set for the suction negative pressure can be changed to a value desired by the operator. Therefore, the suction condition for sucking liquid or the like can be changed depending on the magnitude of the set value. Can be changed slightly. Furthermore, the operator is not limited to the suction negative pressure, and selects one of the two suction side parameters (suction negative pressure, suction time) and sets the value of the selected parameter. Can do. For this reason, in the liquid ejecting apparatus 10 of the present embodiment, it is possible to change the suction conditions in various ways even if the suction amount of the liquid or the like is the same. This is very effective in performing an operation for excising a biological tissue. This point will be described below.

  First, when performing an operation for excising a biological tissue, various situations of the surgical site are assumed. For example, if you focus on the strength of the biological tissue of the surgical site, there are hard tissue and soft tissue, and if you focus on the size of the surgical site, there is also a wide surgical site where the tissue of the surgical site is not so complicated If it is, there is also a narrow operative where the organization is complicated. As long as the situation of the surgical site is not the same as described above, it is considered that when suctioning the liquid or the like accumulated in the surgical site, the suction conditions that can be sucked without damaging the surgical site are variously changed. In this respect, in the liquid ejecting apparatus 10 according to the present embodiment, the suction conditions for sucking the liquid or the like in the surgical site can be changed, so that the suction conditions according to the situation of the surgical site can be selected. As a result, it is possible to aspirate fluid or the like accumulated in the surgical site without damaging the biological tissue that has not been excised from the surgical site as much as possible.

  FIG. 7 is an explanatory view exemplifying how damage to a biological tissue can be suppressed when the liquid in the operation site is sucked using the liquid ejecting apparatus 10 of the present embodiment. Note that the example shown in FIG. 7 corresponds to a case where the surgical site is relatively narrow, such as a portion where the biological tissue is complicated and complicated.

  A liquid is ejected from the ejection port 122 to excise the biological tissue of the surgical site. At this time, since the suction is performed only between the jets as described above, the surrounding tissue is not sucked into the suction port and deformed while the jetted droplet hits the tissue. The street site can be excised. At this time, in a state where the surgical site is narrow and the biological tissue is approaching to the immediate vicinity of the suction port 124, as shown in FIG. Nearby biological tissue is sucked to the suction port 124. In such a situation, for example, if the suction time is set to be relatively short, even if the biological tissue of the surgical site is sucked to the suction port 124, the suction time is immediately ended, as shown in FIG. 7C. In addition, the biological tissue leaves the suction port 124. Therefore, it is possible to avoid a situation where the biological tissue is sucked into the suction port 124 and damaged.

  As described above, in the liquid ejecting apparatus 10 according to the present embodiment, the operation part can be selected without damaging the biological tissue that has not been excised as much as possible by enabling selection of the suction conditions according to the condition of the operation part. The liquid etc. collected in can be sucked. Also, even if the suction parameters are changed by changing the suction side parameters, the suction volume of liquid etc. is maintained, so that the surgical site becomes difficult to see because the injected liquid etc. accumulates in the surgical site. There will be no adverse effects such as stagnation, or the fluid collected in the surgical site becomes a barrier and the ability to excise biological tissue is reduced.

C. Modified Examples There may be several modified examples in the embodiment described above. Hereinafter, these modified examples will be briefly described. In the following modification, the same components as those of the above-described embodiment are denoted by the same reference numerals as those of the embodiment, and detailed description of the same components is omitted.

  In the liquid ejecting apparatus 10 according to the above-described embodiment, the flow channel pipe 120 has a double-pipe structure, and the suction port 124 is provided at the tip of the flow channel pipe 120, It has been described that the area between the outer pipe and the outer pipe is used as the suction flow path 126 so that the flow path pipe 120 has both a liquid ejecting function and a liquid suction function. However, the channel tube 120 is exclusively used for ejecting the liquid, and a suction tube for sucking the liquid may be provided separately from the channel tube 120.

  FIG. 8 is an explanatory diagram showing a rough configuration of the liquid ejecting apparatus 10 of the present modification. As shown in the drawing, in the liquid ejecting apparatus 10 of the first modified example, a suction pipe 128 for sucking liquid is provided separately from the flow path pipe 120, and is provided on the side surface near the tip of the suction pipe 128. Is provided with a suction port 124. The suction port 124 is connected to the suction mechanism 150 via a suction channel 126 (not shown) provided in the suction pipe 128. The position where the suction port 124 is provided is not limited to the above.

  In the liquid ejecting apparatus 10 of this modification example, the operator can freely move the suction tube 128 even while the distal end of the flow channel tube 120 is directed in a certain direction and the biological tissue in the surgical site is being excised. Can be made. Therefore, when aspirating the liquid or the like accumulated in the surgical site, the suction port 124 can face the surgical site from various angles. As a result, for example, in a surgical site where biological tissue is complicated, the suction port 124 is exposed to the surgical site at a more appropriate angle, so that liquid or the like accumulated in an area that is difficult to be sucked can be efficiently suctioned. be able to. Even if the biological tissue that has not been excised is inhaled during the excision of the biological tissue at the surgical site, it is only necessary to move the suction tube 128 away from the surgical site. Therefore, it is not necessary to interrupt the operation in the middle of the operation, so that it is possible to avoid a loss of operation time.

  Although the liquid ejecting apparatus according to the present embodiment has been described above, the present invention is not limited to all the embodiments and modifications described above, and can be implemented in various modes without departing from the gist thereof. . In the present embodiment, it has been described that the liquid is ejected in pulses by the ejection mechanism. However, the mode of ejecting the liquid is not limited to the pulse, and may be ejected in any mode.

  DESCRIPTION OF SYMBOLS 10 ... Liquid injection apparatus 100 ... Injection mechanism (liquid injection means) 102 ... Supply flow path 104 ... Pressurization chamber 106 ... Injection flow path 110 ... Piezo element 112 ... Membrane member 120 ... Flow path pipe 122 ... Injection port 124 ... Suction port DESCRIPTION OF SYMBOLS 126 ... Suction flow path 128 ... Suction pipe 130 ... Suction pump 140 ... Liquid tank 150 ... Suction mechanism (suction means) 152 ... Opening / closing valve 154 ... Suction pump 160 ... Control part 161 ... Injection control part (injection amount acquisition means) 162 ... Liquid supply amount setting dial 163 ... Injection amount setting dial 164 ... Injection cycle setting dial 165 ... Suction control unit (suction condition setting means) 166 ... Suction negative pressure setting dial (maximum negative pressure setting means) 166s ... Suction negative pressure selection switch 168 ... Suction time setting dial (suction period setting means) 168s ... Suction time selection switch 1 0 ... control switch.

Claims (4)

A liquid ejecting apparatus that is electrically connected to a liquid ejecting apparatus that includes a liquid ejecting unit that ejects liquid from the ejection port in the form of a pulsating flow, and a suction unit capable of sucking the liquid ejected from the ejection port. A control device for a liquid ejecting apparatus capable of controlling
A control unit morphism injection for controlling the liquid injection means,
And a suction 引制 control unit for controlling said suction means,
The ejection control unit is capable of acquiring information relating to the amount of liquid ejected from the ejection port by the liquid ejecting means,
The suction control unit has suction condition setting means capable of setting suction negative pressure and suction time of the suction means,
The suction condition setting means includes
Based on the information about the liquid amount and one of the suction negative pressure and the suction time set manually, the other of the suction negative pressure and the suction time is automatically set,
The suction control unit causes the suction means to periodically and repeatedly perform suction and suction stop using the set suction negative pressure and suction time ,
A control device for a liquid ejecting apparatus, wherein suction is performed while the liquid is not ejected from the ejection port. The control device for a liquid ejecting apparatus according to claim 1,
The suction unit control unit causes the suction unit to start the suction after an arbitrary delay time has elapsed since the start of the injection, and to end the suction before an arbitrary time to start the next injection of the injection. A control device for a liquid ejecting apparatus. The control device for a liquid ejecting apparatus according to claim 1 or 2,
The suction time tc of the suction means satisfies the expression tc <TA−t1 where TA is the suction cycle of the suction and t1 is a time delay from the start of the injection to the start of the suction. A control device for a liquid ejecting apparatus. The liquid ejection control device according to any one of claims 1 to 3,
The suction controller is
A first dial for setting the suction negative pressure;
A second dial for setting the suction time;
A control device for a liquid ejecting apparatus , comprising: a selection switch for enabling either one of the first dial and the second dial to be manually set .